Are there any processes in the coal chemical industry that can save energy?
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Energy conservation is a hot topic in today’s society. In the coal chemical industry, or more precisely in the processes of coal coking, waste heat, exhaust gas, and residual heat can be recovered and utilized. And it would be best if it could be used on the production line?
Energy savings are quite significant! ! Manage energy savings! !
Coal moisture adjustment in flue gas enables energy savings; this dual approach to energy conservation makes use of waste heat while also reducing the heat required for coking
This problem is common in the chemical production area! For example, the design of the heating section in the drum cooling, primary cooling, and secondary cooling stages! Heat exchange with residual ammonia water during ammonia vaporization! Utilize benzene vapor for heat exchange with rich oil, and so on! The list is endless.
Dry quenching of coke: Generating electricity using the latent heat of red coke； Adding waste plastics to coal: By utilizing waste plastics, the strength and yield of coke are improved, while the yield and quality of tar and coke oven gas are also significantly enhanced.
I heard that the CMC coal moisture control technology used at the Muroran Coking Plant of Hokkaido Steel in Japan makes use of flue gas, and it works very well. Does the moderator know if any manufacturers in China are using this technology?
There are several aspects to consider: for example, to make use of the waste heat from the riser, a heat transfer oil system is required. It recovers heat while also reducing the amount of water sprayed by the circulating ammonia pump. We are currently discussing the use of a heat pipe exchanger to heat the gas before it enters the saturator, by utilizing the exhaust gases from a crude benzene tubular furnace.
In my opinion, coal moisture control technology is only suitable for top-loading furnaces and not suitable for rammed coke ovens
There are many areas where energy can be saved: recovering heat from the flue gases of coke ovens, exchanging heat between wastewater from ammonia vaporization towers and raw material water, and reusing waste heat, to name a few. At present, an energy-saving challenge for coking enterprises is how to utilize the heat from the waste gas after the rising pipe. Instead of spraying it with ammonia like we do now, which is a waste.
I’ve heard that some factories have installed heating sections between the flue ducts and chimneys to capture the energy from exhaust gases; I think this is an area that has been little explored so far, with great potential for utilization.
Recovering the heat from the waste gas in the rising tube is a promising approach for energy savings. However, due to the presence of a refractory lining inside the rising tube and its connection to the bridge tube, it presents certain challenges when considering the heat exchange methods and the installation of recovery pathways. I am eager to discuss this topic with those who are interested.
Controlling the moisture content of the coal fed into the furnace, ideally at 8%, can effectively reduce the amount of gas used； Hot water heating for the lower section of the cold drum initial cooler. Insulation and heating are also necessary in some processes; for example, in desulfurization, this can effectively prevent blockages in pipes and trays, as well as reduce the amount of steam required for purging.
At present, the main focus is on the reuse of waste gas heat, by installing heat exchange devices to heat the feed gas or generate steam.
In China, coal moisture regulation is still in its infancy; Chongqing Iron and Steel introduced this technology but with limited success. Now, both Baosteel and Jinan Iron and Steel have adopted it!
I’m not sure how you came up with 8% moisture content for the material going into the furnace; I thought it should be around 6%!