Method and device for power generation by utilizing steam generated from waste heat of steel mill in cascade mode

Abstract

The invention discloses a method and a device for power generation by utilizing steam generated from waste heat of a steel mill in a cascade mode. The device comprises a chimney, a main shaft fan, a sintering machine, a cooling machine, a large flue of the sintering machine, a machine tail flue gas superheater of the sintering machine, a machine tail flue gas preheater of the sintering machine, a deaerator, a feed pump, a waste heat boiler of the cooling machine, a steam turbine, a generator, a condenser, a condensate pump, a circulating fan and the like. Through three process steps of preheating condensed water of the steam turbine by utilizing the preheater in machine tail flue gas of the sintering machine, generating intermediate-temperature steam by heating the waste heat boiler of the cooling machine, heating the intermediate-temperature steam further through the machine tail flue gas superheater of the sintering machine to generate high-temperature steam and the like, the power generation is performed by utilizing the steam generated from the flue gas waste heat of a sintering machine plant fully. The power generation is performed by utilizing the steam generated from the heat of the machine tail flue gas of the sintering machine and the flue gas of the cooling machine of the steel mill, so the quality of the generated steam is improved greatly and meets the requirement of waste heat generation, and a process flow is simple.

Description

technical field [0001] The invention relates to the field of waste heat utilization of sintering process in the iron and steel industry, in particular to a cascaded utilization of heat from sintering machine tail gas and cooler flue gas, that is, by using the preheater in the sintering machine tail gas to preheat the condensed water of the steam turbine, cool the A method for generating medium-temperature steam by heating the machine waste heat boiler, and further heating the medium-temperature steam by the tail gas superheater of the sintering machine to generate high-temperature steam for power generation and the device used therein. Background technique [0002] The iron and steel industry is one of the industrial sectors with the largest energy consumption, and the energy consumption of the sintering process accounts for about 10% of the total energy consumption in the steel production process, ranking second only to the iron-making process. The waste heat resources in t...

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Problems solved by technology

[0005] (1) The flue gas volume of the high temperature section at the tail of the sintering machine is generally less than that of the waste heat boiler of the cooler, so setting up a separate waste heat boiler makes the structure complicated and the cost increases

[0006] (2) The temperature and flow rate of the flue gas at the tail of the sintering machine are different from those of the flue gas generated by the cooler. The process is also a dynamic process, and the parameters of the steam produced will fluctuate to a certain extent

In this way, when two streams of steam are merged, since the steam parameters are difficult to ensure consistency, the economy and safety of waste heat utilization will inevitably be affected during the process of combining steam.

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