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Analysis and treatment measures of causes of smoke coming out of oven doors in coke oven production

Analysis and treatment measures of causes of smoke coming out of oven doors in coke oven production

Abstract: Smoke from the coke oven door is a common problem in coke oven production. Under continuous high-load production, the aging of production equipment, and improper operation and maintenance during production, all of which make the situation of smoke from the coke oven door increasingly serious. Smoke and fire from the coke oven door will not only easily cause damage to the coke oven body and iron parts protecting the furnace, affect their service life, reduce the recovery rate of chemical products and coke oven gas, but also cause serious environmental pollution. Therefore, the treatment of the problem of smoke and fire from the coke oven door is also the current focus of coking enterprises in coke oven production. This article mainly analyzes the causes of smoke from oven doors in coke oven production, and proposes relevant treatment measures.

Keywords: coke oven production; smoke from oven door; cause analysis; treatment measures

In recent years, as the environmental protection situation has become increasingly severe, environmental pollution issues have gradually attracted widespread attention from all walks of life. Reducing pollution emissions and achieving clean production have become important contents in the current production management of coking enterprises. In coke oven production, due to the aging of the equipment and the frequent opening and closing of the coke oven door, the sealing performance of the coke oven door frame continues to decline. In addition, some human operating factors in production have caused the problem of smoke and fire from the coke oven door during production. Smoke from oven doors is one of the important sources of pollution emissions in coke oven production. Coke oven flue gas contains a large amount of high-temperature dust particles, toxic and harmful gases and other pollutants. Therefore, once the coke oven flue gas escapes and spreads, it will inevitably lead to the deterioration of the surrounding operating environment, threaten the health of operators in the coke oven area, and cause pollution to the atmospheric environment. Under the current environmental protection situation, all coking enterprises attach great importance to the problem of smoke and fire from the coke oven door, and have also adopted relevant prevention and treatment measures, which have achieved certain results and effectively reduced the occurrence of smoke and fire problems from the coke oven door.

The dangers of smoke and fire from the coke oven door

In general, the hazards of smoke and fire from coke oven doors mainly include the following aspects: environmental pollution. Coke oven flue gas contains a large amount of fine dust particles, carbon dioxide, nitrogen oxides and other pollutants. The escape of flue gas is actually the direct emission of untreated flue gas. The diffusion of these substances into the environment will inevitably cause atmospheric pollution. Deterioration of operating environment. When the coke oven door smokes seriously, the thick smoke will not only affect the sight of nearby operators, but the high flue gas temperature will also increase the discomfort of operators near the coke oven door. Affect the service life of coke oven. Smoke and fire from the furnace door can easily cause the iron parts protecting the furnace to burn, making the coke oven body easily damaged, thereby affecting its service life. Moreover, when the pressure in the gas collecting pipe is negative, air will leak into the carbonization chamber along the coke oven door gap, thereby causing an increase in coke ash and causing and aggravating furnace wall leakage. Affects the recovery of coke oven gas and chemical products. Coke oven flue gas contains waste gas, tar and other recyclable substances, which can be used to burn and produce various chemical products, increasing corporate profits. However, smoke from the oven door causes these things to be lost and wasted, which pollutes the environment. , and also reduces the recovery rate of gas and chemical products.

Analysis of the causes of smoke coming from the coke oven door

In the daily production of coke ovens, the main causes of coke oven door smoke include deformation of the coke oven frame, damage and deformation of the furnace door knife edge, insufficient cleaning of the coke oven door frame, inaccurate coke oven door alignment, and loose closing, etc.

The spring fails and the coke oven door blade is deformed or damaged. Under the force of the spring, the knife edge will produce a pressing force on the furnace frame, so that the deformation difference between the coke oven door frame and the coke oven door body is compensated, thereby improving the sealing performance of the coke oven door. In actual production, due to the very harsh working environment of the spring, high temperature and heavy load, under long-term frequent opening and closing use, the spring gradually ages, the compressible stroke is shortened, and the rebound force decreases. As a result, the pressing force of the knife edge against the furnace frame is reduced, and the sealing of the coke oven door frame is not tight, causing smoke leakage. In addition, under long-term high-temperature operation, the web plate and upper and lower cross heads on the knife edge will creep, causing the gaps between the four corners of the web plate on the knife edge, the upper and lower cross heads and the furnace door frame to change. Over time, cracks and damage appear at the four corners, and the coke oven door is poorly sealed, causing the furnace door to smoke.

Improper operation of picking the right door. The driver of the coke-blocking truck pushing the coke truck must maintain a high degree of concentration when picking up the opposite door and operate in strict accordance with the operating procedures. If the door alignment is incorrect or the operation is incorrect, the coke oven door blade or the furnace frame may be damaged, causing deformation and damage and a decrease in sealing performance, which may in turn cause the coke oven door to emit smoke. In addition, when operating the door, coke caught between the coke oven door and the door frame will cause the seal to be loose, causing gastric smoke in the coke oven door.

The furnace door is not cleaned in time and in place. Because the temperature on the surface of the coke oven door and outside the furnace is relatively low. After removing the oven doors from both ends of the coke side of the carbonization chamber before pushing coke, a large amount of tar, impurities, etc. in the coke oven flue gas will adhere to the knife edge grooves, the coke oven door frame, and the surface of the coke oven door refractory bricks due to cooling. place. If the coke oven door is left intact without regular cleaning, tar and other impurities will build up over time, making it more difficult to deal with. Tar and impurities fill the joint between the coke oven door and the door frame, increasing the gap between the coke oven door and the door frame. Excessively thick tar and impurities prevent the small coke oven door from being effectively locked and closed, resulting in a decrease in its sealing performance and causing smoke and fire.

The pressure of the gas collecting pipe fluctuates. Under normal production conditions, the coke oven gas collecting pipe pressure needs to be controlled between 120 Pa and 170 Pa. If the pressure is improperly controlled and the gas collecting pipe is too high, it will cause excessive pressure in the carbonization chamber. In addition, if the coke oven door is not tightly sealed, waste gas will escape from the gaps in the furnace door. The higher the pressure, the more serious the smoke escape will be, resulting in smoke and fire from the coke oven door, which will affect the coke oven production environment. In addition, during the process of loading coal into the coke oven, if the high-pressure ammonia water pressure is less than 3.5 MPa, the suction of the gas collecting pipe is insufficient, the gas pressure in the furnace top space cannot be released, and it is very easy for the furnace door to smoke.

Measures to prevent and control smoke from coke oven doors

To prevent and reduce coke oven door smoke and fire, the most fundamental thing is to take measures to improve the sealing performance of the oven door.

Strengthen furnace door repairs. The coke oven door has been exposed to harsh environments for a long time and is frequently removed and closed. Problems such as damage and deformation of the blade edge of the coke oven door and failure of the locking device often occur, which affects the sealing performance of the coke oven door. Therefore, in the daily production of coke ovens, a special maintenance system should be developed to conduct regular maintenance of the oven door, and promptly repair the oven door with damaged blade edges and loose sealing. The regular cyclic maintenance of the furnace door should be once every three months. At the same time, furnace doors with serious smoke and fire problems during production should be replaced and repaired in time. If the coke oven door cannot be replaced and repaired in time due to production reasons, etc., some temporary sealing measures can be taken, and the smoking area of the furnace door can be sealed with yellow mud to prevent smoke from escaping. After maintenance, it should be ensured that all parts of the furnace door are intact and usable, the knife edge is flat and adjustable, the springs and pressure frame bolts remain flexible, and the resilience is sufficient. At the same time, during routine maintenance, the integrity of the furnace door lining bricks should also be checked, and seriously deformed or damaged lining bricks should be replaced in time. In order to maintain the tightness of the coke oven door, reduce the smoke from the coke oven door and the collapse of the burner head when pushing the coke to remove the door.

Strengthen the cleaning of the coke oven door and furnace frame. During the production of coke ovens, impurities such as tar residue and coke powder will inevitably adhere to the coke oven door frame, coke oven door knife edges and coke oven door lining bricks, making it impossible for the coke oven door to be closed tightly. If cleaning is not carried out for a long time, the accumulation of impurities will become thicker and thicker, making it increasingly difficult to clean. Not only will the gap between the coke oven door and furnace frame increase, the smoke problem will worsen, and in severe cases, the coke oven door will not hang up. Therefore, during coke oven production, it is necessary to clean the oven doors and oven frames on both sides of the machine and coke in a timely manner. Strive to remove a hole of coke and clean a hole in the furnace. Carefully clean the tar residue, coke powder and other impurities on the coke oven door frame, coke oven door knife edge and furnace door lining brick surface. Especially for the corners of the coke oven door, the grooves of the knife edge of the coke oven door and other places that are difficult to clean, cleaning must be strengthened. Ensure normal contact between the coke oven door blade and the coke oven door frame and good sealing.

Improve the driver’s operating level and strictly control coke pushing and coal loading operations. Strengthen training and education to improve coke oven truck drivers’ operational level and awareness of compliance with regulations and safe operations. The coke pushing cart and the coke blocking cart must be positioned accurately to achieve one-time alignment. Be careful when removing and hanging the door, and operate it carefully to prevent damage to the furnace door blade due to improper operation. In addition, during the coal loading operation, the coal must be fully loaded, evenly loaded, and firmly loaded. It is strictly forbidden to have missing corners on both sides of the machine coke to prevent damage to the furnace body and door due to high burner temperature.

Stabilize high-pressure ammonia water and gas collecting pipe pressure. During production, high-pressure ammonia water pipelines need to be carefully inspected to troubleshoot problems and find hidden dangers. Seriously worn ammonia water pumps and three-way ball valves with serious leaks, ammonia water pipelines, etc. must be repaired and replaced in time. It is necessary to ensure that the pressure of high-pressure ammonia water is above 3.5 MPa. During coal loading, remember to control the quantity of high-pressure ammonia water at 1. Clogged ammonia water nozzles and pipelines must be cleared in time to ensure that the amount of ammonia water sprayed is sufficient to prevent smoke from coal loading. In addition, it is necessary to strengthen the control of the coke oven gas collecting pipe pressure to prevent the gas collecting pipe pressure from being too high or too low. In addition to adjusting the gas collecting pipe flap valve in time according to the production situation, the gas collecting pipe must be cleaned regularly to remove tar and other impurities deposited in the pipe, and remove graphite adhering to the brick surface at the root of the riser pipe and the bridge pipe. , tar should be cleaned in time to ensure smooth flow of pipelines.

Strengthen coke oven temperature management. Through thermal adjustment, the temperature of the furnace head is further increased, the furnace door insulation is increased, and the temperature difference is reduced. Ensure the temperature of the furnace head bricks and furnace shoulders, reduce the erosion of the lining bricks, and maintain good sealing of the furnace door.

Conclusion

In general, to reduce the risk of smoke and fire from the coke oven door, the main thing is to strengthen the sealing of the coke oven door. Therefore, it is necessary to strengthen the inspection and maintenance of the furnace door and furnace frame and clean the furnace door during production, and operate in strict accordance with the operating procedures. At the same time, the pressure control of the gas collecting pipe should be strengthened. Only in this way can the problem of smoke and fire from the furnace door in coke oven production be effectively controlled, the pollution emissions of coking enterprises can be reduced, and the clean production of enterprises can be promoted.

Coking Equipment Manufacturer
coke ovens
coke oven door

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