Waste heat power generation device capable of obtaining waste gas in multistage from sintering machine and cooling machine in steel plant

Abstract

The invention discloses a waste heat power generation device capable of obtaining waste gas in multistage from a sintering machine and a cooling machine in a steel plant. The waste heat power generation device disclosed by the invention mainly comprises a sintering machine assembly and a sintering integrated waste heat recovering device, a cooling machine assembly and a cooling integrated waste heat recovering device, as well as a condensed water tank, a condenser, a deaerator, a feed water treatment device, a turbine, a power generator and other supporting facilities, wherein the sintering machine assembly comprises a sintering machine, a tail-part main flue, an electric dust collector and a chimney; the sintering integrated waste heat recovering device mainly comprises a cyclone overheater, a sintering machine waste heat boiler and a pipeline; the cooling machine assembly comprises a cooling machine, an air blower and a chimney; and the cooling integrated waste heat recovering device mainly comprises two cyclone overheaters, a cooling machine waste heat boiler and a smoke and air pipeline. According to the invention, the waste gas generated by the sintering machine and the cooling machine in the steel plant can be obtained in multistage according to different temperatures, so that the investment cost of devices can be reduced, the waste heat power generation capacity is increased, and the service life of equipment is prolonged.

Description

technical field [0001] The invention relates to a waste heat power generation device, in particular to a waste heat power generation device which utilizes sintering and cooling machines in iron and steel plants to extract waste gas waste heat in multiple stages. Background technique [0002] The energy consumption of the sintering process in iron and steel enterprises accounts for 10% to 20% of the total energy consumption, ranking second only to the ironmaking process. At present, the energy consumption of the sintering process in China is relatively high, and the average energy consumption per ton of sintering ore is more than 19% higher than that of foreign advanced indicators. One of the main reasons is that the recovery rate of waste heat resources in the sintering process is low. At present, some enterprises in my country use the waste heat of coolers to produce steam to drive steam turbines to generate electricity. The technology they generally adopt is to set three ...

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Problems solved by technology

This patent does not take into account that the composition of the flue gas at the tail of the sintering machine is relatively complex, containing impurities such as SOx, NOx and dust

If low-pressure parameters are used to recover this part of heat, low-temperature acid dew point corrosion will inevitably occur on the heating surface of the boiler, which will directly affect the operation and service life of the boiler. In severe cases, the tube will be perforated and the furnace will be shut down.

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