Coal gas, converter steam and sintering waste heat combined power generation device and waste heat utilization method

Abstract

The invention relates to a coal gas, converter steam and sintering waste heat combined power generation device which comprises a generator 1, a turbine 2, a condenser 3, an over-heat compensation combustion furnace 4, a waste heat boiler 5 of a sintered smoke exhaust pipe, a waste heat boiler 6 of a circular cooler, a steel converter drum 9 and a steam accumulator 8 of the converter, wherein low parameter over-heated steam generated by the waste heat boiler 6 of the circular cooler is connected with a steam compensation opening 202 of the turbine, high parameter saturated steam generated by the waste heat boiler 5 of the sintered smoke exhaust pipe and the steam accumulator 8 of the converter enters into a main steam inlet 201 of the turbine through the over-heat compensation combustion furnace 4, and a rotary shaft 204 of the turbine 2 is connected with or drives a rotary shaft of the generator 1. The coal gas, converter steam and sintering waste heat combined power generation device provided by the invention has the advantages that residual coal gas, sintered waste heat and converter steam of an iron and steel plant are comprehensively utilized, the utilization ratio of waste heat is high, the system is flexible, the outage rate of a steam turbine unit is low, and the investment and operation costs are low.

Description

technical field [0001] The present invention relates to a waste heat power generation system, in particular to a coal gas, converter steam and sintering waste heat combined power generation system, in particular to a coal gas, converter steam and sintering waste heat combined power generation device and a waste heat utilization method or a method of generating electricity. Background technique [0002] Iron and steel enterprises are energy-intensive enterprises with huge energy consumption, accounting for about 16% of the country's total energy consumption. The energy utilization rate is 30% to 50%, and the energy consumption per ton of steel is about 20% higher than that of developed countries. In the process of iron and steel production, a large amount of gas, high-temperature flue gas, and steam are produced, and a large part of waste heat and energy can be recycled. [0003] At present, the gas recovered by most large iron and steel plants is mainly used as fuel for the...

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Problems solved by technology

In this way, a lot of waste heat is recovered, but setting up many scattered small waste heat back to power stations will bring two problems: one is that it occupies a lot of land, requires a large investment, and the operation and maintenance costs are high; on the other hand, part of the waste heat recovery Low thermal efficiency, poor system stability, high shutdown rate

This waste heat recovery method does improve the parameters of saturated steam, but it does not utilize the high-temperature exhaust smoke of the heating furnace, and the waste heat of sintering only uses the waste heat of the ring cooler, and the thermal efficiency of the system is low. Although it solves the problem of merging waste heat systems, But it does not improve the efficiency of waste heat utilization

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