Introduction to the application of acoustic sootblowing technology in the power plant boiler?

October 2000, Jianbi Power Plant on the 5th boiler tail heating surface soot blowing system for technical transformation, respectively, in the coal economizer and high and medium temperature section of the air preheater parts of the installation of 48 SB-70 plug-in programmable acoustic sootblowers, in order to solve the boiler tail heating surface ash slagging problem [1].

1 SB-70 inserted program-controlled acoustic soot blower

The basic principle of acoustic soot blowing lies in the acoustic wave on the accumulation of high acceleration of ash stripping and vibration exhaustion crushing effect. In addition, sound wave and smoke gas flow, the fluid dynamic field relationship between the heat exchanger tube, high sound intensity nonlinear extraordinary effect will play a role in removing ash and coke. Compared with the traditional method of ash removal, the advantages of acoustic soot blowing are mainly:

(1) acoustic radiation has omnidirectionality, very high refractive and fast propagation (speed of sound), as well as in the gas propagation with very small attenuation and other characteristics. It can be evenly distributed throughout the space, all-round ash removal, can be removed to other methods are not easy to remove the dead ends. To achieve the purpose of smooth flue, keep the heated surface clean and improve the efficiency of heat exchange.

(2) acoustic wave ash removal method using acoustic vibration to achieve the effect of ash removal, acoustic wave ash removal method itself can affect the sediment generation mechanism, prevent and delay the formation of sediment, play a role in preventing slagging, blowing ash effect is good.

(3) low energy consumption, installation and investment costs short payback period.

(4) Sonic sootblowing does not cause thermal stress on boiler components.

1.1 SB-70 inserted program-controlled acoustic sootblowing system composition and technical indicators

SB-70 inserted program-controlled acoustic sootblowing system consists of a gas source, acoustic sootblowers, program-controlled cabinets, solenoid valves and connecting pipes. Gas source to provide the mechanical energy required to produce acoustic energy, acoustic soot blower will be a high-pressure gas source carried by the modulation of DC energy converted to alternating acoustic energy, program-controlled cabinet is used to control the operation of the acoustic soot blower, the solenoid valve accepts the program-controlled cabinet of the instructions to control the access to the gas source, that is, the control of acoustic soot blower on and off. SB-70 plug-in programmable acoustic soot blower for the specific structure and installation of the description of references 〔3〕. 3].

SB-70 inserted program-controlled acoustic soot blower technical indicators are as follows:

Gas source properties: compressed air or superheated steam.

Gas source pressure: compressed air is above 0.1MPa; superheated steam is above 0.3MPa.

Air source flow: 0.6~1.0m3/min for compressed air; 0.8~1.0m3/min for superheated steam.

Operating frequency: 600~800Hz.

Sound intensity characteristics: 140dB~150dB or more.

1.2 Characteristics of SB-70 inserted program-controlled acoustic soot blower

SB-70 inserted program-controlled acoustic soot blower has no wearing parts such as motor, diaphragm and so on, and does not need to replace parts. It requires low pressure of gas source and has high applicability.

SB-70 inserted program-controlled acoustic soot blower adopts the insertion type, which is directly arranged in the flue next to the heated surface, not in the furnace wall, the furnace wall does not need to open holes, and will not damage the structure of the furnace wall, which overcomes the drawbacks of other types of acoustic soot blower in terms of fixation, vibration damping, heat preservation difficulties and poor applicability. Inserted arrangement can also be arranged according to the size of the heated surface and the accumulation of soot more than one soot blower, to ensure that the heated surface can receive sufficient strength of the sound wave, better soot removal effect.

SB-70 plug-in programmable acoustic sootblower generated by the acoustic wave on the boiler equipment mainly through acoustic vibration, the working frequency of 600-800Hz SB-70 acoustic sootblower, it is difficult to cause boiler **** vibration, and the noise is very small during normal operation, does not produce noise pollution.

2 SB-70 inserted program-controlled acoustic soot blower in the Jianbi Power Plant application

Jianbi Power Plant 5 boiler tail flue has 4 Lun, from top to bottom sequential arrangement of high-temperature section of the air pre-preheater, the coal economizer, the medium-temperature section of the air preheater and the low-temperature section of the air preheater, according to the degree of each heated surface ash, the choice of the economizer and the high and medium-temperature section of the air preheater parts of the installation of the acoustic soot blower, and the other. According to the size of the heating surface, each heating surface to install four acoustic sootblower, a lun installed 12 acoustic sootblower, arranged in three rows, respectively, suspended in the high-temperature section of the air pre-preheater, the coal economizer and the medium-temperature section of the air pre-preheater above, so that the tail flue of the boiler **** installed 48 acoustic sootblowers.

In order to ensure that the sonic sootblower has enough compressed air volume, so that the sootblower can work effectively. In the sootblowing system work, first open a branch of the valve for sootblowing, when this branch of the sootblowing is complete, and then open another branch of the valve for sootblowing, until all the branch of the sootblowing is complete, it shows a sootblowing cycle is over.

After a year of boiler operation, in October 2001, plant technicians entered the tail flue of the boiler and found that the installation of acoustic sootblowers in the economizer and the high and medium temperature sections of the air preheater is basically no accumulation of ash.

Through the sootblower before and after the commissioning of the sootblower temperature and other operating data analysis, found that the sootblower commissioning, the boiler exhaust smoke temperature is significantly reduced, for example, before the installation of acoustic sootblowers, boiler load of 70MW, the temperature of the exhaust smoke for 132 ℃, and after the installation of acoustic sootblowers, the same inlet temperature conditions, the boiler load of 80MW, the temperature of the exhaust smoke for 130 ℃. If compared under the same load, before and after the installation of acoustic sootblowers, the boiler exhaust smoke temperature is reduced by a very large margin.

In order to test the operation of the acoustic sootblower to reduce the effect of exhaust smoke temperature, the start and stop the air preheater part of the acoustic sootblower, boiler changes in the experimental study.

The test results show that after stopping the operation of the air preheater acoustic sootblower, the boiler exhaust smoke temperature began to rise, the first three days of the exhaust smoke temperature rises slowly, after about four days of time, the exhaust smoke temperature rises rapidly. The reason is due to the beginning of a few days is the air pre-preheater gradually accumulated ash process, to a certain time, the air preheater ash accumulation is serious, affecting the air preheater heat transfer process, so the smoke temperature rises rapidly. Tests show that the sonic sootblower for the air pre-preheater in addition to the ash has a significant effect. Restore the air pre-preheater sonic sootblower operation, after about the same time, the boiler exhaust temperature is reduced to the original level, from the beginning of the 150 ℃ to 126 ℃, indicating that the sonic sootblower will be the first few days of the air pre-preheater deposition of dust removal, sonic sootblower ash removal effect is obvious. The above tests were conducted under the same working conditions.

SB-70 acoustic sootblower in Jianbi Power Plant industrial applications show that it has a very good sootblowing effect, effectively reducing the boiler exhaust temperature and flue resistance, greatly improving the boiler efficiency, economic benefits are very significant.

It is believed that after the above introduction, we have a certain understanding of the application of acoustic sootblowing technology in the power plant boiler. Welcome to visit Zhongda Consulting for more information.

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