Issues regarding the design of the smoke guiding car on the roof of a side-loading coal feeder for ramming coking
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In our company, after coal is loaded from the top and compacted for coking on that side, severe smoking occurs at the top of the furnace. Although smoke suppression and dust removal vehicles are used, their effectiveness is limited. We now plan to use bridge pipes to connect the N+2 carbonization chambers in order to direct the smoke away; this will not only reduce environmental pollution but also allow for the recovery of waste gas. What other factors need to be considered in this design process, in addition to the pressure of high-pressure ammonia water and the furnace door sealing? I would appreciate it if everyone could provide more feedback, especially those who have worked on similar projects in coking plants – your valuable insights are greatly needed, particularly regarding the equipment. I’m waiting urgently for your responses. :victory: QQ41484104 Last edited by yfb777 on 2007-11-19 17:51 ]
Negative pressure coal loading is quite effective for reducing smoke and dust! However, negative-pressure coal charging imposes strict requirements on the operation of coke ovens, and generally shortens their lifespan. Poor sealing of the guide sleeves or inadequate coal charging procedures can lead to an increased amount of air entering the side where coal is charged, thereby raising the oxygen content in the gas; therefore, attention must be paid to the time taken for side coal charging. As long as the furnace door seal remains intact and provides a tight seal, with no leaks or sparks, that’s sufficient! No improvements are needed! When operating the series guide sleeve, care should be taken to switch between positive pressure and negative pressure operation.
Smoke ducts can be installed at the upper end of the furnace door on the machine side, and smoke collection devices can be added to the coal loading vehicle to capture the dust and smoke emitted from the furnace door during coal loading.
We conducted a test run last week, but the results were not satisfactory; the main issue was that the pressure of the high-pressure ammonia solution was insufficient – the pressure at the rising pipe was only 21 kilograms. The insufficient suction led to a large amount of waste gas being released into the air. We are now preparing to replace the pump.
What does negative pressure coal loading mean? I see it often; I’m currently learning about it*
It involves using high-pressure ammonia water to spray the bridge tubes, thereby creating a negative pressure that draws the raw gas from the carbonization chamber into the collection ducts. This prevents the raw gas from escaping outside the carbonization chamber as smoke, allowing it to be recovered as much as possible in the collection ducts; this approach is both environmentally friendly and helps in recovering the raw gas.
To truly solve the problem of smoke elimination, I believe the following approach should be taken: 1. The upward tubes containing high-pressure ammonia water should be located on the coke side, in order to reduce the likelihood of air entering from the coal-loading side. 2. The hole used for loading coal should be treated as a small air collection duct; a small high-temperature fan should be installed at the U-shaped bend used to direct the smoke away. Using variable-frequency speed control, and without relying on high-pressure ammonia water, will yield the best results. I hope everyone will contribute their ideas and discuss this together
Does anyone know about coal-loading smoke guide vehicles? Contact me on QQ 408832990
One should not increase the suction force solely to improve smoke elimination, as this will lead to the intake of large amounts of cold air, causing the furnace temperature to drop rapidly and shortening the lifespan of the coke oven.
Is high-ammonia water really effective? It is said that the quality of valves produced domestically is substandard; they can only be used for a few dozen operations before failing to close properly, which affects the stability of the pressure of high-pressure ammonia solution as well as the proper operation of the carbonization chamber during the coking process. Using a U-tube to divert the newly added raw coal gas to an adjacent furnace is troublesome to operate, it can also affect the quality of the raw coal gas, and it is not necessarily cost-effective. Personally, I think it’s better to add a smoke collection hood on the machine side to collect and handle the waste gas generated during coal loading under slightly positive pressure.
:Lol, we just got them – coal and smoke guiding vehicles imported from Germany, with double U-tube design. The three-way valves cost 10,000 yuan each; 90% of the process is automated. What’s important is the pressure of the high-pressure ammonia solution – if the pressure is between 25 and 30, there’s no smoking, but if it’s too high, it becomes dangerous and could lead to an explosion. Under normal conditions, it works fine, but the technology and operation involved are not simple at all! :@