Sintering ore cooling waste gas full combustion-supporting generating set

Abstract

The invention relates to a method for reclaiming sintering ore cooling waste gas low-temperature waste heat, in particular to a sintering ore cooling waste gas full combustion-supporting generating set, which comprises a fuel supply system forming a conventional fuel boiler generating system, a generating boiler, a steam turbine, a generator, a condenser, a circulating water pump, a cooling tower, a water supplementing pump, a condensed water pump, a low-pressure heater, a deaerator, a water supply pump, a draft fan and a chimney, and also comprises a sintering ore cooling waste gas collector and a waste gas pressurizer, wherein the waste gas collector is placed above a sintering machine of which a water gas output pipe is connected with a combustion chamber of the generating boiler, and the water gas output pipe is provided with the waste gas pressurizer. The device has the advantages that: the reclaiming rate of the waste heat of the sintering ore cooling waste gas is greatly improved, the waste heat grade of the sintering ore cooling waste gas is greatly improved, the basic Rankine cycle efficiency of the generating system is greatly improved, the vast disposable investment and precious land resources are saved, the running expense of the generating system is greatly reduced, and the management fee of the generating system is greatly reduced.

Description

Technical field: [0001] The invention relates to a low-temperature waste heat recovery method for sinter cooling waste gas, in particular to a sinter cooling waste gas full combustion-supporting power generation device which uses all sinter cooling waste gas for combustion support in conventional power generation boilers. Background technique: [0002] At present, there are two ways to recover the low-temperature waste heat of sinter cooling waste gas. One is the steam recovery method: use sinter cooling waste gas to heat boiler feed water to generate low-pressure steam, and the low-pressure steam is supplied to process and domestic steam. The second is the power recovery method: the sinter cooling exhaust gas is used to heat the boiler feed water, and the low-pressure steam generated by the low-temperature waste heat is used to drive the steam turbine to generate electricity. [0003] Due to its simple process and low investment, the steam recovery method is currently the m...

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Problems solved by technology

[0005] (1) Due to the large fluctuations in the sinter cooling exhaust gas parameters (exhaust gas temperature, exhaust gas flow), the stability of the sinter cooling exhaust gas low-temperature waste heat power generation system is low, and the shutdown rate, low load rate, especially the failure rate of the low-voltage system High, even the low-pressure system is completely shut down, resulting in the actual economic efficiency of the sinter cooling waste gas low-temperature waste heat power generation system is far lower than the design value

[0006] (2) Due to the low temperature of the sinter cooling waste gas (generally only 300-360°C), the parameters of the main steam generated by the sinter cooling waste gas waste heat boiler are also low, resulting in the thermal cycle efficiency of the sinter cooling waste gas low-temperature waste heat power generation system The recovery rate of the sinter cooling waste heat recovery boiler for the low temperature waste heat of the sinter cooling waste gas is also low

[0007] According to the above analysis, the known low-temperature waste heat power recovery process of sinter cooling waste gas itself is not perfect, and there are problems such as low waste heat recovery rate and thermal cycle efficiency, poor stability of power generation system, etc., which seriously restricts the low-temperature waste heat power recovery of sinter cooling waste gas Process economy

According to theoretical calculations, the low-temperature waste heat carried by a ton of sinter cooling waste gas can be converted into electricity up to 150-200KW h, while the theoretical annual average power recovery capacity of sinter cooling waste gas per ton of sinter cooling waste gas is only 15-200KW h. 18KW·h, after considering the shutdown rate, low load rate, and low-voltage system failure rate of the sinter cooling waste gas low-temperature waste heat power generation system, the above-mentioned power recovery will decrease

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