Method and device for high-temperature ultrahigh-pressure reheating waste heat power generation

Abstract

The invention relates to the technical field of environmental protection equipment, in particular to a method and a device for high-temperature ultrahigh-pressure reheating waste heat power generation. The method comprises the following steps that an induced draft fan is utilized to send 1000-1170 DEG C ascension pipe high-temperature flue gas generated in the coke production line productive process to a high-temperature ultrahigh-pressure reheating waste heat boiler through a gas collecting pipeline for heat exchange to generate 13.7 MPa and 540 DEG C high-temperature ultrahigh-pressure steam, and a generator set is used for generating electricity. According to the method and the device for the high-temperature ultrahigh-pressure reheating waste heat power generation, the high-temperatureultrahigh-pressure reheating waste heat power generation technology is adopted to replace an existing 3.82 MPa and 450 DEG C medium-temperature medium-pressure waste heat power generation technology,and the power generation steam consumption rate is about 3 kg / kWh, so that the system energy utilization efficiency is improved by 30% or above, and the boiler type structure and the part configuration of the high-temperature ultrahigh-pressure reheating waste heat boiler is reasonable; high-efficiency heat transfer components are adopted, and a steam reheating device is arranged so that the system energy utilization efficiency can be effectively improved; partial medium-pressure steam can be extracted for reheating by an intermediate stage of a steam turbine and then is returned to the steamturbine to do work so that the system heat cycle efficiency can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of environmental protection equipment, in particular to a high-temperature, ultra-high-pressure reheating waste heat power generation method and a device thereof. Background technique [0002] At present, most of the high-grade flue gas waste heat in the iron and steel industry, such as: CDQ waste heat, non-chemical coke oven tail gas and other heat sources, are currently mainly used by 3.82MPa, 450℃ medium temperature and medium pressure waste heat power generation technology, most of the current 3.82MPa, The 450℃ medium-temperature and medium-pressure waste heat generator set mainly adopts the power generation method of direct pure condensation power generation, and there is no steam extraction and reheating process. The steam consumption rate of power generation is about 4.5kg / kWh to 4.8kg / kWh, and the energy utilization efficiency is relatively low. . With the continuous deepening of waste heat power ge...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a high-temperature, ultra-high-pressure reheat waste heat power generation method and its device, so as to solve the low energy utilization rate of current waste heat power generation equipment using 3.82MPa, 450°C medium-temperature and medium-pressure waste heat power generation technology in the above-mentioned background technology question

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