Coke oven riser waste gas waste heat utilization technologyThe heat brought out by waste gas accounts for about 36% of the total output heat of coke ovens, and the potential for waste heat utilization is huge. A lot of research has been carried out on this part of the waste heat at home and abroad, trying to utilize it in a variety of ways: using heat transfer oil to waste gas waste heat; Use heat pipes to waste gas waste heat; Use boiler ** waste gas to bring out heat; Use semiconductor temperature difference power generation technology to generate waste heat from waste gas; Waste gas waste heat microfluidic technology; In foreign countries, waste gas is used to bring out heat to carry out high-temperature pyrolysis or reforming of COG; Efficient negative pressure ammonia distillation process using waste gas waste heat as heat source; Use the waste heat of waste gas from the primary cooler**82-85; Waste gas is used abroad to directly burn electricity to generate electricity. However, most of them are still in the R&D and experimental stage, and so far there is no mature and reliable direct utilization technology that has been proven to be long-term operation.
Red coke sensible heat** utilization technologyThe sensible heat of red coke accounts for about 37% of the total output heat of the coke oven. At present, the most mature technology for sensible heat of red coke is CDQ technology. More than 88% of the coke ovens of coking plants of China's iron and steel enterprises are equipped with dry quenching devices; Large-scale iron and steel conglomerates began to require the change from wet quenching standby to dry quenching standby; Independent coking plants are also gradually adopting CDQ technology in order to save energy and reduce emissions.
Coke oven flue exhaust gas waste heat utilization technologyThe heat carried out by the flue exhaust gas accounts for about 17% of the total output heat of the coke oven. Its ** utilization technology is as follows:
The third-generation coal humidification technology with coke oven flue exhaust gas as the heat source. Many companies in China are developing coal humidification technology with coke oven flue gas as the heat source, but most of them are in the initial or trial stage. The impact of the application of coal humidification technology on coke oven production and gas purification process is the fundamental obstacle to the industrial application and promotion of this technology. The impact of the current coal humidification device on the coking process:
The graphite junction in the furnace wall and riser tube of the coke oven carbonization chamber increased, and the ammonia nozzle was blocked.
The resistance of the primary cooler, the gas pipeline in front of the blower, the desulfurization tower and other equipment of the gas purification system increases;
The blades of the gas blower are seriously worn, the condensate and the oil residue cannot be separated, and the quality of chemical products is seriously reduced;
Due to the influence of the coal humidification process, the gas purification system is shut down according to the process to clean the clogged equipment and pipelines.
The dust pollution is serious in the process of transporting, storing, loading and loading the furnace of humidity control coal.
The uneven humidity control is the main reason for the increase of dust content in waste gas.
The coal humidification process belongs to a branch of the whole coking system engineering, and the advantages and disadvantages of its technology cannot be judged simply by the dehumidification capacity of raw coal and the process energy consumption index of coal humidification, but should be analyzed and evaluated from the aspects of humidity uniformity, heat exchange efficiency of coal humidification unit, resistance loss, adjustability and adaptability, exhaust temperature, and classification methods of fine particle coal, so as to have the lowest impact on the coke oven operation and gas purification process.
* Coke oven flue gas waste heat to produce steam. In recent years, the technology of producing steam from coke oven flue gas waste heat from heat pipe waste heat boiler has developed rapidly because of its low investment and quick results. At present, more than 30 sets of this technology device have been put into operation across the country, and about 20 sets are under construction.
Negative pressure ammonia distillation with coke oven flue gas as the heat source. The negative pressure ammonia distillation technology developed in China with coke oven flue gas as the heat source has been put into operation and has a good promotion prospect.