Researching on Residual Heat Recovery Process and Technology of Coke Plant in Chongqing Iron & Steel Co. Ltd
|Keywords||Waste heat resources Energy conservation Thermal equilibrium Dry coke quenching|
In the the coking production and gas purification process, contains a large amount of waste heat resources, has a great recycling value, coking plant with great potential during waste heat utilization and energy savings. The production of heavy steel coking plant belonging to the extensive production and operation, energy efficiency, waste heat is rich in resources but did not receive effective recycling, with a typical representative in the domestic coking industry. Relying on the actual production of the heavy steel coking plant in the topic, research coking waste heat resources recycling technology, combined with the heavy steel environmental relocation the coking project planning program, research for its scale of production and production technology features, comprehensive of reasonable economic waste heat resources technical solutions, to provide technical support to the energy saving of the new heavy steel coking plant, has a practical significance. Determined by analysis of the heat balance of the coke oven, the main direction for the recovery of the red coke the physical hot, raw gas and sensible heat of combustion exhaust gas, which the sensible heat of red coke accounted about 35% of the calories fed into the coke oven coke production and the recycling of waste heat resources is the main object of study; determine the utilization of the waste heat of the gas purification system to adjust the chemical process to recover the high temperature process medium heat mainly through the analysis of the production process and waste heat of the gas purification system which energy system structure and state-of-the art, energy systems substitute for direct purchased energy-based indigenous energy (such as coke oven gas). According to the current the coking industry's waste heat recovery technology trends, research coking plant waste heat recovery technology applications and application conditions. Heavy steel environmental relocation the coking project planning program to study the application possibilities and applications of the various waste heat recovery technology, estimates of technical and economic rationality. The Coking system focuses on dry coke quenching process instead of wet coke quenching (CDQ) technology program, identified the huge economic and social environmental benefits of dry coke quenching. Gas purification systems focus on the vacuum potassium carbonate desulfurization process with cross tube early cold recycling process make use of the waste heat of the cross tube primary cooler on energy distilled ammonia process; steam jet flash technology; oriented ejection tray distillation process. Energy systems focus on the technology of coke oven gas instead of steam: oil heating technology to replace the process of direct steam and ammonia; direct-fired absorption chillers to replace steam absorption chiller; industrial circulating water source heat pump technology; circulating water cooling using surface evaporative air cooler. The annual production capacity of 2.4 million tons of coke coking project in accordance with the heavy steel environmental relocation scale, determine the waste heat recovery technology program, recycling waste heat for more than 202,160 tons / year of standard coal equivalent, the waste heat utilization technology to reduce dust emissions, reducing atmospheric and water pollution, and also has significant environmental benefits.