melting Furnace design conditions
Incinerators shall be produced in accordance with the technical conditions for the production of small waste incinerators. The normal combustion temperature of furnace is controlled at 800 ℃ and the highest temperature is controlled at 1200 ℃.
Furnace: according to the design of a combustion chamber, temporarily according to the round bottom surface, diameter 1200 mm, after feeding material height according to the average height of 300mm, flame height according to 800mm considerations.
Ignition: burner, upper surface, diesel auxiliary ignition.
The incinerator adopts horizontal structure. The integrated design of primary combustion chamber and secondary combustion chamber is considered (according to the air supply), and automatic ignition is adopted. The main design plan of the incinerator (preliminary scheme for reference) is as follows.
1 Feed port; 2 furnace inner wall; 3 exhaust pipe; 4 shell; 5 secondary air supply passage; 6 adiabatic material; 7 agitator; 8 grate; 9 primary air supply passage; 10 support; 11 seal cover, grate, agitator rotation control device; 12 cover 13 blower
The main process structure parameters of the incinerator are described as follows:
a.Furnace chamber volume is not small 1000L, primary packing 300L,
b. In view of the uniform temperature in the furnace with circular structure, especially in the circumferential direction, the furnace adopts a circular structure with a diameter of 1200mm and a height of 1100m.
c. When combustion depends on the blower to supply air for combustion, the lower opening of the furnace is closed by baffle to prevent ash burning slag and dust escaping from escaping in the cabin, and the slag discharge is controlled by sealing cover, grate and agitator rotation control device.
d. Because the furnace is placed in the tank, the height of the main body is limited, the maximum can not exceed 2.2 m, and the bottom of the furnace should be reserved for automatic slag extraction and ash barrel (space requirement 700mm), so the main part of the furnace is controlled at 1.5 m.
Attached: test material combustion test data
Experimental combustion material: the main constituent element, Con. On the whole, the test material burns well, because of the solid particles, the capacity reduction can be controlled at 10 ~ 10 on the whole. After agitation, the combustion condition is good and the efficiency is the highest.
|
kind of test |
incendiary material kg |
Total combustion time min |
Main process and phenomenon |
Basic conclusion |
|
combustibility test |
2、3 |
60、70 |
Start black smoke, normal around, smoke reduced |
Test material combustible, average combustion efficiency 0.038kg/min |
|
Natural intake combustion test |
4.55 |
45 |
The test material is flammable, starts black smoke, normally wraps around, the smoke quantity decreases, during the combustion process will slowly shrink into the lump, accompanied by the black smoke, and drops down through the mesh hole the black liquid with the flame |
The test material is combustible, the surface layer is fully burned, the temperature results in hot melt (pyrolysis), and the average combustion efficiency is 0.101kg/min. |
|
Ventilation combustion support |
2、2、2 |
18、19、20 |
Black smoke begins, normally wound around, smoke volume decreases, after 6 minutes to achieve full combustion, the temperature reached the highest, and then the temperature gradually decreased |
The test material is combustible and the ventilation meets the need of combustion. The average combustion efficiency is 0.105kg/min. |
|
Ventilation, diesel fuel combustion, timing |
2、2、2、2、2 |
3（1.72） 6（1.091） 9（0.7606） 12（0.3657） 19（0.0786） |
Black smoke begins, normally wound around, smoke volume decreases, after 6 minutes to achieve full combustion, the temperature reached the highest, and then the temperature gradually decreased |
According to the regression curve, the combustion time should be 17 minutes, and the average combustion efficiency is 0.118kg/min. |
|
Ventilation combustion support, continuous feeding |
2、1、1、1 |
11 minutes after feeding, 1 minute each time, burning 35 minutes |
Start black smoke, normal around, smoke reduced |
Combustion efficiency: 0.142kg/min |
|
Short chimney comprehensive working condition |
2、2 |
20、21 |
Start black smoke, normal around, smoke reduced |
Combustion efficiency average 0.097kg/min |
|
Short chimney filling |
10 |
46 |
Start black smoke, normal around, smoke decreased, |
Combustion efficiency average 0.217kg/min |
|
Extended chimney filled with material |
10 |
34 |
The smoke concentration of black and gray smoke at the flue is increased. With each stirring, the fire becomes more and more vigorous, and the black smoke concentration at the flue is increased, and the temperature sensor reaches the highest value of 865 ℃. After that, the temperature began to drop and the fire became smaller. |
Combustion efficiency average 0.294kg/min |
Combustion test analysis:
The basic combustion condition of the test material is good. When the gas supply is 11m / min, agitation, the maximum temperature of the closed furnace with the diameter of 370m is not more than 900 ℃.
The main body height of the simulated incinerator is 490 300 ~ 800, diameter 370, and the flame ejection height from the feeding port is 400 when the gas is supplied. The overall furnace height of the primary combustion furnace needs 1200mm (without considering the chimney effect).
The volume of c.10kg test material is 15.7 L (100 × 100 × 2 block), and the virtual volume height of the furnace is 20 cm after putting it into the furnace. Under the condition of agitation, the burning time takes 37 minutes, and the furnace temperature is low at the beginning of combustion. The maximum temperature (local full combustion) is reached in about 6 minutes. When the furnace temperature is found to decrease, the remaining test materials can be considered according to the burning time of 4 minutes.
