Sintered ring cold exhaust heat stepped recovery power generation system and technique

Abstract

A sintering circulating cooling waste heat cascade recovery power generation system and a process thereof belong to the sintering waste heat utilization technology field. The system comprises a sintering circulating cooling machine, a windward chamber, a leeward chamber, a heat exchanger, a fan, a waste heat boiler, a steam bag, a superheater, an evaporator, an oxygen remover, a steam turbine, a generator, a condenser, a condensate pump and a water supply pump. The totally closed system is adopted to carry out subsection cooling and cascade recovery of waste heat of sinter, thereby recoveringthe sensible heat of the sinter to the maximum extent; the gradual increase of the temperature of cooling air can reduce the heat exchange temperature difference with the sinter; in order to not affect the cooling effect of the sinter, the system adopts the combined mode of the sub-cycle of the cooling air and the major cycle to absorb the sensible heat of the sinter, thereby improving the waste heat recovery efficiency. Compared with the prior art, the system and the process can extremely recover the waste heat of the sinter, improve the temperature of steam which is used for power generation under the premise of not increasing the total circulating air volume, increase the waste heat power generation amount and have great economic effects.

Description

technical field [0001] The invention belongs to the technical field of utilization of sintering waste heat, and in particular relates to a sintering ring cooling waste heat cascade recovery power generation system and a process, which are suitable for recycling power generation of waste gas waste heat of sintering ring coolers in iron and steel plants. Background technique [0002] Sintering waste heat recovery is an important content for iron and steel enterprises to achieve "energy saving and emission reduction" targets. In the sintering process, the sensible heat of the exhaust gas of the annular cooler accounts for about 20-28% of the total energy consumption, which is of great significance to the recovery of the waste heat of the exhaust gas of the annular cooler, which not only saves energy but also has environmental benefits. [0003] At present, the application of waste heat recovery and power generation of sintering ring coolers in China has just started, and the w...

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Problems solved by technology

[0004]The above situation leads to the following main problems in the existing sintering ring cooling waste heat power generation system: ①The heat exchange efficiency is not high, and the energy cannot be fully recovered; ②The steam parameters of power generation Too low, waste heat power generation capacity is limited; ③The system has serious air leakage, and the loss of hot air heat dissipation is relatively large

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