What happened when Xilin Gol League Hongyuan Seawater Desalination Engineering Co., Ltd. was established?

Xilin Gol League, located in the middle of Inner Mongolia Autonomous Region, covers an area of 203,000 square kilometers, including grassland area of 6,543.8+097,000 square kilometers, accounting for one fifth of the whole autonomous region. It is an important ecological barrier in northern China. The total population is 933,000, including 270,000 Mongolians. Xilin Gol League is an important base of livestock products in China and the frontier of western development. There are abundant coal resources here, with the predicted reserves of 65.438+08.828 billion tons and the proven recoverable reserves of 65.438+04 billion tons, among which the recoverable reserves of lignite are 65.438+03.96 billion tons, ranking first in China, with shallow burial and thick coal seam, which is very suitable for open-pit mining. However, lignite is not suitable for long-distance transportation because of its high water content and easy weathering, and most of it is directly burned on the spot, or used for coal chemical industry or pit-mouth power generation.

Xilin Gol League is the frontier of the western development and the revitalization of the old industrial base in Northeast China, and it is the main energy base of the economic zone in eastern Mongolia and western Liaoning and the economic zone around Bohai Sea planned by the state.

According to the unified planning of the state and Inner Mongolia Autonomous Region, Xilingol League has determined the lignite development strategy of developing electric power and coal chemical industry in Kengkou, which needs a lot of water.

Xilin Gol League is located in arid and semi-arid areas, with large sandstorm, less rainfall and large evaporation. The annual rainfall is only 150 ~ 350 mm, and the annual evaporation is 2000-2700 mm. At present, the grassland and land desertification area in the whole league has reached 2970 square kilometers, and it is expanding at the rate of 143 square kilometers per year. There are 1363 lakes in the whole league, most of which have dried up, and a lot of fine dust and sandy land at the bottom of the lake have dried up.

According to the data of the second national water resources evaluation, the total water resources in Xilin Gol League is 3.492 billion m? /year, the actual available water resources are 65.438+96.8 million m? /year, of which the surface water resource is 398 million m? /year, the amount of groundwater resources is 65.438+63.4 million m? According to the document number. Energy [2004] No.864 of the National Development and Reform Commission prohibits the use of groundwater for industrial development. Xilin Gol League can only provide 3 1 10,000 effective water every year. In 2007, the total water consumption of the Union reached 298 million cubic meters? During the Eleventh Five-Year Plan period, there was no water in the key projects planned by Xilin Gol League and there was no water in the surrounding areas.

Xilin Gol League seawater desalination circular economy industrial project transfers 365 million m seawater from Bohai Bay every year. At the same time, seawater is desalinated by using the waste heat steam of the lignite gas production project with an annual output of 654.38+0 billion cubic meters, and the annual output of fresh water is 365.438+0 billion cubic meters, thus alleviating the pressure on water resources in Ximeng. At the same time, the annual output of various salt chemical products is 1 1.2 million tons.

The National Development and Reform Commission (NDRC) attaches great importance to this project, and NDRC's recommendation [2007] No.2785 is to start with planning and entrust a large comprehensive engineering consulting institution to fully demonstrate it.

Document [2007] No.23 of the Research Office of the State Council replied to 2837 good proposals of the Fifth Session of the Tenth National People's Congress, pointing out that it is of great significance to implement the project of developing grassland ecological industry by introducing seawater from Xilin Gol League. Our office will actively follow up the implementation of the project of developing grassland eco-industry by desalination led by demons in neighboring countries. And send the investigation report to the State Council leaders and relevant departments for reference.

DocumentNo. [2007]28 issued by the Development and Reform Commission of Inner Mongolia Autonomous Region, Notice on Doing a Good Job in the Preliminary Work of the Integrated Project of Seawater Diversion and Desalination in Xilingol League, points out that in order to speed up the preliminary work and submit the planning report as soon as possible, please do a good job in the preliminary work of the project.

Xilin Gol League Administrative Office Ximeng Ban Zi [2007] No.77 Wen Cheng set up a leading group to promote the preliminary work of the project, with Wang Zhiyuan, the executive vice president, as the team leader and 20 relevant vice presidents and business executives attending.

DocumentNo. [2005]40 of Xishi Dangfa in Xilinhot City was established, with Mayor You Xiaoyang as the team leader and 19 as the leading group for project promotion, which played an important role in project implementation.

The document number is Xilinhot Municipal Bureau of Land and Resources [2006] 19. The planned land for seawater desalination is 23 square kilometers, and the artificial natural gas industrial park 10 billion cubic meters.

The document number is Xifa [2008] No.244 of Xilin Gol League Water Conservancy Bureau, which requires that the construction of seawater desalination project of your company is the best way to solve the water shortage problem of our league. I hope your company can implement the project as soon as possible. Provide water resources support for industrial development and ecological construction in our Union.

Xilingol League Development and Reform Commission Xifa Gaizi [2007] No.525 document, Shengli East No.1 open pit mine is located in the middle and east of Shengli Coalfield in Xilinhot City. The overall planning of the mining area has been approved by the National Development and Reform Commission, which is a supporting resource for seawater desalination and coal gasification transportation to Beijing and Tianjin.

According to the spirit of the above-mentioned documents, Xilingol League Hongyuan Seawater Desalination Co., Ltd. organized more than 22 large-scale institutes in China 100 scientists with practical experience to carry out the four-year feasibility study of the project, entrusted Zhongshui North Survey and Design Institute to design the feasibility study report of seawater transportation project, entrusted China Tianchen Chemical Company to design the feasibility study report of lignite-based artificial natural gas, and entrusted China Zhongqing International Engineering Co., Ltd. to design the feasibility study report of seawater desalination and salt production.

In order to provide necessary geological and topographic data for the design institute, Xilin Gol League Volkswagen Construction Engineering Survey Co., Ltd. was entrusted to complete the topographic map of 23 square kilometers industrial park 1: 2000 and the geological drilling work data in the feasibility study stage.

The above work is the basic data for the feasibility study of this project.

The main content of the project is to build six major projects, including coal chemical engineering, seawater desalination and salt making engineering, seawater transportation engineering from Bohai to Jixi, lignite open-pit coal mine engineering, coal preparation plant and coal gangue power plant.

Except for the seawater transportation project, the six major projects all adopt the principle of one-time planning and phased implementation.

coal chemical industry

The project takes 33.4 million tons of locally produced fine washed lignite as raw materials, and produces 654.38+0 billion cubic meters of natural gas, of which the first phase construction scale is 5 billion cubic meters, with an investment of 654.38+065.438+052 billion yuan. The engineering plant belongs to the coal gasification plant of the mine mouth type, which can gasify and convert inferior lignite in situ to produce high-quality synthetic natural gas, reaching the first and second technical indexes of the national natural gas quality standard GB 17820- 1999.

In the process of producing natural gas from coal, by-products are high-quality solid sulfur, 15% agricultural dilute ammonia water, and some gas products such as pure oxygen (O2), pure nitrogen (N2), pure argon (Ar) and pure CO2.

Brown coal gasification process is to pulverize clean coal from coal preparation plant into pulverized coal, heat it to 300℃ with nitrogen, and then transport it to gasifier with carbon nitride for gasification. The water gas produced by gasification is desulfurized by adjusting the proportion of carbon monoxide and hydrogen through shift process, and then enters the low-temperature methanol washing device, and then is purified and sent to the methane synthesis device to synthesize artificial natural gas.

This project recommended a number of world-leading technologies and equipment:

Large-scale lignite dry pulverized coal pure oxygen pressurized gasifier, chilling process, CO2 pressure airflow coal conveying technology. The technology is planned to adopt a brand-new design combination, mainly made in China, supplemented by introduction. The daily consumption of pulverized coal in a single boiler is 2000 tons, and the gasification pressure is 4.0MPa.

Large-scale advanced energy-saving air separation equipment, with a single oxygen production capacity of 90,000 cubic meters per hour, provides pure nitrogen, pure oxygen, pure argon, instrument air and factory air for the factory. The large air compressor plans to introduce foreign equipment, and the cold box can be designed and manufactured by domestic equipment or domestic and foreign manufacturers.

Domestic catalysts and equipment for large-scale shift and low-temperature methanol washing process are adopted, with completely independent intellectual property rights, advanced and reliable technology and low investment.

The design of large-scale gas methanation plant adopts five sets of parallel production lines, and the production capacity of each production line is 65.438+0 billion cubic meters/year. The catalyst and reactor can adopt foreign patented commercial technology or domestic newly developed technology, and be determined through investigation and bidding during project implementation.

The superheated steam with 9.8 MPa and 540℃ in this project is 1342.3 tons/hour, which is transported by the boiler of coal gangue power plant built in the park. This device uses high-pressure steam as power to drive compressors and other equipment. The low-pressure steam (including by-product steam from coal gasification unit) discharged by the back pressure of steam turbine is 4920 tons/hour, the temperature is 65438 0.20℃ and the pressure is 0.08 MPa, and it is sent to seawater desalination plant as a heat source. This heating is both reliable and economical.

Seawater desalination and salt making project

Seawater contains more than 90 kinds of elements, and all the elements existing in nature on earth can be found in seawater. In the ocean, water in seawater accounts for 96.5%, and solutes composed of various salts account for 3.5%. The solubility of offshore seawater in China is lower than that of ocean water, and the solubility of salt solute is about 3%. There are many kinds of solutes in seawater, but their solubility varies greatly. Among them, salts composed of sodium, magnesium, calcium, potassium, chlorine, sulfur and bromine account for 99.9% of all solutes in seawater.

The above elements can be extracted from sodium chloride (NaCl), potassium chloride (KCl), magnesium chloride (MgCl2), magnesium sulfate (MgSO4), calcium sulfate (CaSO4), bromine (Br2) and other compounds as products by appropriate technology.

According to the characteristics of this project, the seawater desalination technology at home and abroad is comprehensively compared, and the scheme of "low temperature multi-effect distillation concentration desalination+multi-effect evaporation crystallization separation" is adopted for seawater desalination. The working process is as follows:

Pretreated seawater enters a low-temperature multi-effect seawater desalination device and is separated into desalinated pure water and 10% concentrated seawater through a multi-effect concentration and separation process.

The desalinated concentrated seawater is concentrated to 22% by multi-effect evaporation concentration process to obtain fresh water.

In the process of concentration, calcium sulfate dihydrate is separated and purified to form gypsum products, which can be used as building materials or other uses.

22% concentrated mother liquor is mixed with the recovered high and low temperature salt of separated magnesium sulfate, and the sodium chloride salt slurry is separated by multi-effect evaporation crystallization, dehydrated and dried to obtain the finished refined salt. Comprehensive utilization of salt-making mother liquor to produce salt chemical products.

First of all, potassium chloride is produced by evaporation of brine. That is, bittern is mixed with concentrated bittern containing magnesium chloride. When the mixed halogen evaporates to 128 ~ 130℃, high-temperature salt is precipitated, and the main components are sodium chloride and magnesium sulfate monohydrate.

Sodium chloride and magnesium sulfate were obtained by two-step separation of high temperature salt. Cooling the evaporated mother liquor to 30-35 DEG C; C carnallite crystallization. Adding water to decompose to obtain crude potassium chloride, and purifying the crude potassium chloride to obtain refined potassium chloride.

After extracting potassium chloride, the bromine content in concentrated brine increases, mainly in the form of magnesium bromide and sodium bromide. Bromine was extracted by chlorine oxidation and steam distillation. The production process of bromine includes preheating, oxidation, distillation, bromine gas condensation, bromine water separation and rectification.

Crystalline magnesium chloride was produced from bromine-making waste liquid after bromine extraction by brine preheating, evaporation and concentration, heat preservation and precipitation, and cooling and crystallization.

The mother liquor of magnesium production is recovered and returned to the process, or halogen flakes are produced by evaporation.

Various magnesium compounds obtained in the process can be used as products, and can also be further processed into high-purity magnesium oxide and other magnesium-based fine chemicals.

In this process route, the low-temperature multi-effect distillation unit adopts a new low-temperature multi-effect seawater desalination unit developed by Qinhuangdao Xinyuan Water Industry Co., Ltd., which has independent intellectual property rights and won the national invention patent. The device is characterized in that: the drawer structure is adopted, which is convenient for manufacture, assembly, maintenance and maintenance; The high concentration of seawater can be achieved by using Ouguan plate evaporator, and the concentration ratio can reach 7 times; Adopt plate evaporator, modular design, convenient for large-scale mass production; The device is simple in structure and good in manufacturing process, and can completely realize the existing domestic manufacturing means; All mechanical and electrical equipment supporting the device are localized; Compared with foreign companies, the manufacturing cost of one ton of water equipment is reduced by 30 ~ 40%. The technology and equipment of salt making system in this process route have been widely used at home and abroad. At present, the chemical plant of Tianjin Luchang Hangu Salt Field, which has been put into production, adopts evaporative crystallization separation device, with an annual output of 65,438+500,000 tons of sea salt.

The heat source needed for seawater desalination and salt making projects comes from preheating steam, a by-product of coal chemical industry. The two projects are arranged in a strip shape and adjacent to each other, which is beneficial to the transportation of low-pressure steam and reduces losses.

The total planning and design scale of this project will reach an annual output of 3100000 cubic meters of fresh water, and all kinds of salt chemical products165438+200000 tons, including 8 million tons of refined salt; 200,000 tons/year of potassium chloride; Magnesium sulfate 500,000 tons/year; Bromine 20,000 tons/year; Magnesium chloride is 2 million tons/year, and a certain number of other seawater chemical resources products can be produced.

In order to cooperate with the waste heat steam of coal chemical industry, the construction scale of this project has reached 70% of the total scale, with an investment of 6.5 billion yuan.

The fresh water produced by this project is used locally for industrial water and people's living water such as coal chemical industry, salt chemical industry, grassland ecology, agriculture and desertification control; Refined salt is used for chemical salt in the downstream of the region, chemical salt in Bohai Bay and Northeast China, and chemical salt in North China. Potassium chloride and bromine are short-term products of salt chemical industry, easing the domestic market; Chemical products of magnesium sulfate and magnesium chloride salt can be directly sold to domestic and foreign markets, or processed to produce downstream products such as potassium magnesium fertilizer, magnesium hydroxide, magnesium oxide and metallic magnesium.

Bohai Sea-Jixi Seawater Transportation Project

Bohai-Jixi seawater transportation project is the basic project of seawater desalination circular economy industrial project in Xilin Gol League, Inner Mongolia Autonomous Region. It is planned to take water from the east bank of Taizili, Xingcheng East, Huludao City, Liaoning Province, and pass through Huludao City, Chaoyang City, Chifeng City, Inner Mongolia and Xilinhot City, Liaoning Province with no water in the middle. The total length of the line is 6 18.46㎞, and the designed water conveyance scale is 365 million m? /year, the design flow is 12.8 m? /s, uninterrupted water supply throughout the year.

The first phase of this project was completed with an investment of 654.38+059 billion yuan. The operation scale of the first phase reached 70% of the design scale, and the operation load of the second phase was 100%.

The water transmission line spans Liaoning and Inner Mongolia provinces (autonomous regions). After 8 railways, 29 highways and 20 rivers.

There are 9 pumping stations, 1 1 pressureless tunnels, 2 1 buried pipes and 57 buildings crossing railways, expressway, national highways, provincial highways and rivers. In order to improve the water supply guarantee rate of the project, an online water transfer reservoir is set up.

Four of the nine-stage pumping stations are in Inner Mongolia and five in Liaoning Province. The total design lift 1 170m, and the total installed capacity is 280,800 kilowatts. Each pumping station has a single lift 130 m, and six single pumping stations are installed, of which two are standby, and the designed flow of each pump is 3.2 m? /s, the installed capacity of a single machine is 5200KW, and the installed capacity of each pumping station is 3 1.200 KW.

1 1 tunnels are all pressure-free water conveyance, with a longitudinal slope of 1/5000 and a total length of 304.73㎞. There are 7 tunnels with a length greater than 10㎞, of which 9# tunnel is 43.384㎞. .

1 # ~ 20 # buried pressure pipes are all filled with sand, with a total length of 3 13.73㎞ and an inner diameter of 3.2m and a pressure of 0.6 ~ 2.0 MPa ... 21# buried pressure pipes are arranged between the regulating tank and seawater desalination, and are also arranged with double pipes filled with sand, with an inner diameter of 3.

The geographical location of the regulating reservoir is about 18㎞ in the northwest of Xilinhot, and the distance from the receiving area is about 1.5㎞. According to the topographical conditions, it is arranged between Tahe Aceh and the small basin surrounded by Gunlegai on the south bank of Xilin River. The total storage capacity is17 million m? , adjust the storage capacity to150,000 m? , which can meet the water demand of 15 days in case of pump station or pipeline accident. It can meet the requirement of discontinuous accident parking for up to 35 days every year. The regulating reservoir flows into the east water body through the buried pipe, and the designed inflow is 12.8 m? /s, the water is discharged between two hills on the west side, and the designed flow is 1 1.57 m? /S. The inlet and outlet of the regulating reservoir are controlled by the gate.

There is a 125 pool along the line, which is used to pump water during maintenance, and the maintenance is fast and convenient. After the maintenance is completed, put the water in the backwater pool back into the original pipeline or tunnel. The designed water intake is 7,473,700 m? .

Water transmission lines can be divided into four sections: Huludao City, Chaoyang City, Chifeng City and Xilinhot City.

The nine pumping stations are mainly composed of water inlet system, main and auxiliary power houses, control building, water outlet system, substation and its ancillary buildings.

The water inlet system adopts one machine and one pipe to feed water, and supplies water to six pumps by connecting the pressure forebay and the inlet branch pipe with the diameter of1.4m. The water outlet system adopts one machine and one pipe to discharge water. Six outlet branch pipes with a diameter of 1.2m meet and enter the outlet main pipe with a diameter of 3.2m to supply water to the next pumping station.

No-pressure water conveyance tunnel 1 1, of which four long tunnels, No.3, No.9,10/1#, are mainly constructed by TBM, with circular cross sections and 4.3m inner diameter. The remaining seven tunnels are constructed by drilling and blasting method, all of which are city gate tunnels with a clear bottom width of 4.0m and a clear height of 4.9m.. ..

Application of TBM method in long tunnel construction. Compared with the drilling and blasting method, TBM method has the advantages of safety, rapidity (average daily footage is 20 ~ 40m), high efficiency, good quality, low support cost, small temporary construction amount, etc., and it can reduce the construction area and is beneficial to environmental protection.

The water conveyance pipeline mainly adopts the socket-type glass fiber reinforced plastic sand pipe, the design pressure of the pipeline is 2.0 ~ 0.6 MPa, and the average buried depth of the pipe top is about 2 m. When the water pipe crosses rivers, ditches (canals), the water pipe is designed in the form of inverted siphon. The minimum thickness from the top of inverted siphon to the bottom of riverbed is 2.0m

When pipelines cross rivers, dams and aqueducts should be built first. After the dam is completed, the cement between the two dams should be pumped out and then the silt should be cleaned up. After dredging, backfill and tamp the riverbed with the excavated good soil to reach the elevation of the masonry base, and finally complete the masonry work. For dry rivers, excavation method can be used for construction.

When the pipeline crosses roads and railways. In order to ensure smooth transportation, pipe jacking method is adopted. According to the difference of pipe jacking length and underground quality, the corresponding pipe jacking technology is adopted.

Generally, only sandy foundation cushion is set at the bottom of the pipeline, with a thickness of 20cm. However, it is planned to use mortar masonry or concrete rigid cushion for plane turns, steel pipes, pipelines with poor geological conditions and pipelines crossing rivers and ditches.

Each section of glass fiber reinforced plastic sand pipe is 12m long and weighs about 10t. It will be produced in the FRP pipeline factory constructed in this project, transported to the working face by 15t truck, and lifted by 20t~30t truck crane. Before pipeline installation, the foundation and cushion should be compacted. After pipeline installation, earthwork shall be backfilled by layers, and the maximum backfill thickness of each layer shall not exceed 300mm, and it shall be tamped by light machinery.

Lignite open-pit coal mine project

East No.1 open pit mine, a supporting coal mine of this project, is located in the middle of Shengli coalfield, adjacent to Xilin River in the west. The east-west direction of the surface of the mine field is 5.0-6.5㎞, the north-south direction is 6.5-7.8㎞, the area is 4 1.76km2, and the geological resources at the boundary of the mining area are 31.600 million tons. According to the characteristics of coal mine and the climate in this area, the single bucket-self-moving crusher-belt conveyor-semi-two-demand mining technology is adopted as the main stripping mining technology of this mine.

According to the consumption of coal chemical plant, the open pit mine construction is planned once, constructed by stages and developed by rolling. According to the coal demand of coal chemical plant, the first-phase open pit mine construction scale is 20 million tons/year, with an investment of 7.56 billion yuan; The construction scale of the second phase will reach 50 million tons/year.

Coal preparation plant

The washing process of coal preparation plant adopts internationally advanced dense medium tank separation of lump coal, dense medium cyclone separation of two products of final coal, dewatering of coarse slime centrifuge, dewatering of fine slime screen sedimentation centrifuge and quick-opening plate-and-frame filter press.

The process flow system of the whole plant is simple, flexible and highly reliable, which can realize the full washing and partial washing of the final coal, and the system can be flexibly converted according to the requirements of the product coal. The system adopts the international advanced dense medium separation technology, with high separation accuracy, and the separation ratio can be adjusted and controlled online and in real time according to the ash content of clean coal. The thickener of slime water system adopts one for use and one for standby, which ensures that all slime water in the coal preparation plant is recovered in the plant, the washing water reaches the national first-class closed cycle, and the slime water is not discharged, which meets the environmental protection requirements of the coal preparation plant and the surrounding environment.

After coal preparation process, lignite clean coal, coal gangue and middle coal are selected from raw coal. After coal gangue and coal are separated and dehydrated, they are used for power generation in coal gangue power plants. By breaking the water molecule bond in lignite with special equipment, clean coal and lignite can be dehydrated at low temperature. The dehydrated lignite clean coal ash has a low melting point, and retains the original combustible volatile matter of lignite, so it is the best gasification coal, and can be made into coal water slurry for the raw coal gasification of Texaco gasifier. It can also be made into lignite fine powder and used for raw coal gasification in high temperature pulverized coal furnace. This process is used for large-scale upgrading of lignite, which can meet the standard of commercial coal and is suitable for long-distance transportation.

The construction scale of the first phase of the project is 25 million tons of lignite raw coal per year, with an investment of 654.38+0.48 billion yuan; After the second phase of the project is completed, the total scale will reach 50 million tons of lignite raw coal every year.

Coal gangue power plant

The boiler is a 670t/h circulating fluidized bed boiler with steam pressure of 9.8MPa and temperature of 540℃. Fuels are coal gangue and coal. The steam turbine generator set is a condensing generator set, and a single generator generates 300,000 kilowatts. Steam turbine condensate returns to desalted water, and returns to boiler room for boiler water supply after fine desalting in mixed bed. The total scale of coal gangue is 600,000 kilowatts, of which the first phase construction scale is 300,000 kilowatts, with an investment of 4.5 billion yuan.

The products and raw materials of the six major projects of seawater desalination circular economy industrialization project in Xilin Gol League are interrelated, forming the following circular economy industrial chain:

First of all, the "lignite open pit mine" mines 60,600 tons of lignite every day and sends it to the coal preparation plant. In the coal preparation plant, 5 16000 tons of finely washed lignite are selected every day and sent to the coal chemical plant as raw materials for brown coal gasification. At the same time, the remaining 24,654,38+0,000 tons of coal gangue are sent to the gangue power plant for power generation.

Coal chemical plants use these fine washed lignites to produce natural gas every day: coal to natural gas13.7 million standard cubic meters; 235 tons of agricultural ammonia; Sulfur 139 tons; 6,800 tons of ashes. The waste heat steam of 1 1. 1.4 million tons generated in the production process is transported to the seawater desalination plant as the heat for seawater desalination.

Bohai Sea transports 700,000 cubic meters of seawater to the project park every day through the "seawater transportation project". This part of seawater enters the Seawater Desalination and Salt Chemical Plant, which produces11400 tons of low-pressure steam and 1900 tons of refined salt every day. 959 tons of calcium sulfate; 384 tons of potassium chloride; 959 tons of magnesium sulfate; 54.8 tons of bromine; 3,835 tons of magnesium chloride. At the same time, it produces 595,000 tons of desalinated water, including 2 1 10,000 tons for self-use, 36,000 tons for "coal chemical plant", 6 1 10,000 tons for "coal gangue power plant", 7,000 tons for open-pit coal mine 1 10,000 tons and coal washing plant. The remaining 469,000 tons of desalted water are sold as commercial water.

In the coal gangue power plant, using coal and coal gangue can generate 7.2 million kWh of electricity every day. This electricity is supplied to the nearby "Jiubrown Coal Mine" for 770,000 kWh; 780,000 kWh for "coal washing plant" and 2.36 million kWh for "coal chemical plant"; Provided to "seawater desalination and salt chemical industry" for 65,438+0,456,000 kWh. The remaining 6.5438+0.834 million kWh of electricity was incorporated into the State Grid for the "seawater transportation project". The above-mentioned daily production scale is the scale of the first phase of each project.

Coal chemical industry, seawater desalination and salt making projects will produce a lot of low-grade water. The air drying tower to be built in this project consumes this part of heat, but the investment is large, the operation cost is high, the energy is wasted, and the value has not been effectively converted.

If circular economy is adopted according to the design of the Planning and Design Institute of the Ministry of Agriculture, we can consider recycling these low-heat water and using their heat energy to develop intensive agriculture and animal husbandry, such as building greenhouses to produce high-quality silage and providing high-quality forage for aquaculture; Build intensive large-scale sprinkler irrigation, plant pasture and raise 200 thousand beef cattle; Building a supporting biogas power station can also develop the corresponding slaughtering and leather processing industries. Through a series of multistage circulation, the energy of these low-grade water will be fully utilized, and the utilization rate of energy and resources will be improved. Developing intensive agriculture and animal husbandry can improve the utilization value of local desertification land, increase the output of agricultural and animal husbandry products and improve people's living standards.

Industrial park layout

The project is located in Hongyuan Industrial Park in the northern suburb of Xilinhot, with a length of 5,000m from east to west and a width of 4,000m from north to south. Hongyuan Industrial Park has seawater desalination and salt chemical engineering, coal chemical engineering, supporting engineering thermal power station, gangue power plant, substation, public service facilities and living quarters. 1.5 "in the south of the park is the terminal reservoir of seawater transportation project. Located at 11in the southeast of the park, the coal source of this project is Shengli East1open pit coal mine. After mining, the coal used is transported by belt to the coal washing plant between the coal mine and the park. The washed clean coal is transported to the coal chemical plant by belt, and the middle coal and gangue are transported to the gangue power plant by belt for power generation.

Hongyuan Industrial Park is close to railways and highways, with convenient traffic conditions. At present, Jitong Railway and Sang Railway pass near the park, about 5 kilometers away from Shengli Coalfield. The traffic on both railways is very convenient. 207 national highway and National Highway 303 pass through the city, connecting Zhangjiakou in the south and Hexigten Banner in the east. When the factory was built, it was possible to carry out large-scale transportation and super-large railway and highway transportation.

The total investment of the project is 70.66 billion yuan, including 47.46 billion yuan in the first phase and 23.2 billion yuan in the second phase. The payback period of static investment includes 8.02 years before tax and 9. 1 1 year after tax during the construction period.

The industrial project of seawater desalination circular economy in Xilin Gol League of Inner Mongolia will open up a new world for the sustainable development of circular economy in Inner Mongolia, and also open up a new field of seawater utilization, which is a new breakthrough in the marine economic model and a concrete practice of the overall development strategy of land and sea. This project takes a lot of seawater from the Bohai Sea, which can make seawater flow and purify the Bohai Sea to some extent.

The project is equivalent to the salt production of 654.38+10,000 hectares of salt fields, which can replace a large number of salt fields along the coast and alleviate the land shortage in economically developed coastal areas.

The proposal of this project is of far-reaching significance to Inner Mongolia, Xinjiang and even the whole western region rich in coal resources and seriously short of water resources.