Charcoal burning technology in earth kiln

0 1

, kiln shooting; This kind of situation is easy to happen in windy days, usually only on the first day of kiln burning. Reason: It's the kiln.

The thermal explanation of internal wood is due to the large contact area between combustible gases such as hydrogen, methane and oxygen and the rapid combustion.

solve

Scheme: During kiln construction, a buffer pit should be reserved in the chimney, and the chimney should be built into a closed trapezoid from bottom to top. smoke

Make a hood on the chimney to minimize the influence of strong wind on the kiln.

02

, powder stick; Reason: This problem is mainly the moisture in the kiln.

Bad gas weight or airflow in the kiln. Solution: Make full use of the enlarged smoke hole before ignition.

24

Hours (average)

under the circumstances

24

Hours later, the humidity in the kiln is the heaviest), open the enlarged smoke hole.

30

Arrive in minutes

1

The steam in the kiln was exhausted in an hour.

In addition, the chimney should be cleaned before kiln loading to ensure the smooth smoke path.

03

、

Charcoal;

Reason:

There are two main reasons for this kind of problem.

a

The airflow in the kiln is not smooth;

b

Kiln manufacturing problems. Solution:

a

Poor airflow: the main reason is that there is no smoke when the flue is placed.

Yes, the cracks in the bricks were too big, and the sawdust sticks fell into the flue and blocked the flue. This kind of problem can only be prevented and supervised by the kiln loader.

To stop it. It is really impossible to replace it with a furnace flue.

b

Kiln manufacturing problem: Generally speaking, the kiln is not built according to the requirements, with four corners.

Not rounding corners usually leads to such problems.

Because it has been mentioned that the main heat conduction mode in the kiln is air pair.

Flow, if the four corners are right angles, it is difficult for air to flow to this position, so it is difficult for heat to be conducted to this position.

Charcoal will also be produced at this location,

The only solution is not to put sawdust sticks in this position.

04

、

Melting too much;

Reason:

There are many reasons for this problem, which are roughly as follows.

a

Incorrect ignition position

b

The heating process is too long.

c

, kiln flue does not

through

d

Kiln air leakage

e

Solution to excessive oxygen supply during carbonization;

a

Improper ignition position: the ignition position is too close to the oxygen supply hole.

An open flame is generated at the oxygen supply hole (kiln door), which leads to a large number of carbonization at the kiln door. To solve this problem, it is mainly to ignite correctly.

Position, make the ignition position close to the middle of the kiln body.

b

The heating process is too long: sometimes it may be because the charcoal burner is forgotten to turn off.

Kiln time leads to long heating time and wastes some charred charcoal.

c

The kiln flue is impassable: the flue is not

Generally speaking, it will inevitably lead to prolonged carbonization time and more carbon burning, so it is necessary to install the kiln.

Ensure that chimneys and flues are unobstructed.

d

Kiln air leakage: kiln air leakage needs to be repaired in time.

e

Excessive oxygen supply during carbonization: this problem is more complicated.

Handyman and charcoal burner must always observe the temperature in the kiln and adjust the oxygen supply.

05

The kiln is not closed: Reason: The only reason for this problem is that

Kiln air leakage. Solution: The solution is simple. Fix the loopholes in time.

06

, carbon contraction is not good; Reason: There are two main reasons.

individual

a

The carbonization process is too fast;

b

The temperature is not enough. Solution:

a

Too fast carbonization process: too fast carbonization speed.

Fast will inevitably lead to carbon cracking, and once carbon cracks too much, it is difficult to shrink.

So solving this problem is to control carbon.

Speed, control the carbonization speed, that is, control the carbonization temperature not to be too high. Generally not more than

300

Degree.

b

Heating temperature

Not enough:

When the temperature rises during carbon smelting,

The temperature did not reach the required temperature.

Generally, it only reaches the carbon smelting temperature.

Eight hundred

Only the degree is above.

It can make charcoal have good shrinkage. The higher the temperature of carbon smelting, the better the shrinkage, but the higher the temperature, the lower the carbon yield and the higher the cost.

Tall man. It is usually recommended to raise the temperature to

Eight hundred

A degree will do.

07

Carbon has many cracks; Reason: The main reason is that the carbonization temperature is too high, which is also

It may be an inherent defect of the sawdust stick itself. Solution: If it is not the inherent defect of the wood chip stick itself, then you should

Pay attention to control the temperature of carbonization process. Please do not exceed the temperature of carbonization process.

300

Degree. If this is an inherent defect of that wood chip stick itself,

Please go to the Q&A of the molding problem in Chapter 4 to find a solution.

08

Carbon hardness is not enough; The reason for this problem is related to carbon contraction.

No, please refer to item 6.

09

Carbon has no steel sound; be the same as the above

10

, no metallic luster; be the same as the above

1 1

High volatile carbon; origin

Because:

The only reason is that the temperature is not enough

Solution:

Please extend the heating time,

raise the temperature

Eight hundred

Above degrees.

12

、

The ash content of carbon exceeds the standard; Excessive ash content of carbon has a great influence on the chemical quality of carbon, and the products cannot be exported, and even the domestic sales are seriously affected.

The ring. Reason: The main reasons are as follows.

a

Raw materials are not clean;

b

The raw materials themselves have high ash content;

c

Carbonization temperature

High;

d

Solutions for long temperature rise time:

a

Raw materials are not clean: the main way to solve this problem is to control raw materials on the one hand.

During transportation, try to ensure that raw materials are not polluted during transportation; On the other hand, control the storage conditions of raw materials.

Try to avoid sand pollution. At the same time, we should also control the source of raw materials.

b

High ash raw materials: ratio

For example, the ash content of rice husk, straw, weeds and other things is relatively large, so the ash content of charcoal is relatively large. Generally speaking,

Charcoal can not be used in barbecue industry, but only in industry.

c

High carbonization temperature: If the carbonization temperature is too high, it will inevitably

Will make carbon combine with hydrogen and oxygen to escape, so that the carbon is lighter and the ash will not escape, that is,

The ash content of carbon is relatively increased.

d

The heating time is too long: the reason is the same as above.

13

Reasons for insufficient calorific value of carbon: There are many specific reasons.

For example: high ash content, low fixed carbon content of raw materials, high volatile matter, insufficient carbonization, insufficient carbon temperature rise and so on. Solution: Use

Physical solutions can be found above.

14

Reasons for low carbon yield: too high temperature in carbonization process and too long smelting time.