Thermal power generation system based on integrated utilization of afterheat and surplus energy of coking plant

Abstract

The invention provides a thermal power generation system based on integrated utilization of afterheat and surplus energy of a coking plant. The system comprises a coke oven, a dry quenching furnace, a dry quenching afterheat boiler, a crude gas afterheat recovery device, a crude gas purification device, a coke oven gas boiler, a steam turbine and a generator; coke oven hot cokes are fed in the dry quenching furnace for cooling; the dry quenching afterheat boiler recovers sensible heat of circulating gas in an outlet of the dry quenching furnace; the crude gas afterheat recovery device recovers sensible heat of crude gas; the crude gas purification device purifies crude gas to feed in the coke oven gas boiler; steam generated by the coke oven gas boiler is acted by a high-pressure cylinder of the steam turbine to feed in the dry quenching afterheat boiler for reheating, and is fed in a medium-pressure cylinder of the steam turbine with superheated steam of a high-pressure section of the dry quenching afterheat boiler; exhausted steam of the medium-pressure cylinder of the steam turbine and superheated steam of a low-pressure section of the dry quenching afterheat boiler are fed in a low-pressure cylinder of the steam turbine; and the steam turbine drives the generator to generate electricity. The system efficiently integrates coke oven gas, coke oven sensible heat and crude gas sensible gas for use.

Description

technical field [0001] The invention relates to the technical field of thermal energy utilization in the coking industry, in particular to a thermal power generation system based on the integrated utilization of waste heat and energy in a coking plant. Background technique [0002] In the coke oven production process, there are various residual energy and waste heat resources, including chemical energy of coke oven gas, sensible heat of coke, sensible heat of raw gas and other high-temperature waste heat. In the context of increasingly prominent energy problems, the efficient utilization of these waste heat and waste energy resources is currently the focus of every coking plant or steel plant. [0003] For coke oven gas, the current main ways to use it are as heating fuel for the coke oven itself and power generation through gas boilers. Some coking plants also use coke oven gas as chemical raw materials to produce chemical products such as methanol and synthetic ammonia. ...

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Problems solved by technology

Independent thermal systems not only cause system complexity and even redundancy, but also have pr...

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