Multi-point gap type high-temperature flue sensible heat recovery power generating equipment

Abstract

The invention provides multi-point gap type high-temperature flue sensible heat recovery power generating equipment which comprises a waste heat boiler, a heat medium pump, a turbine, a water pump, a power generator and a set of multi-point parallel-connected gap type high-temperature flue sensible heat recovery devices. The waste heat boiler comprises a heat medium pipeline and a moisture circulation pipeline. Heat medium outlets of the multi-point parallel-connected gap type high-temperature flue sensible heat recovery devices are sequentially connected with the heat medium pipeline of the waste heat boiler and the heat medium pump. The heat medium pump is connected with a heat medium inlet of each gap type high-temperature flue sensible heat recovery device. The moisture circulation pipeline of the waste heat boiler, the turbine and the water pump are sequentially connected into a loop. The power generator is connected with the turbine. According to the multi-point gap type high-temperature flue sensible heat recovery power generating equipment, the gap type flue sensible heat recovery devices are utilized, a heat medium is used as a heat exchange medium for indirectly exchanging heat with high-temperature flue gas, the heat medium and the high-temperature flue gas flow downstream in each gap type flue sensible heat recovery device, medium and high pressure superheated steam can be produced, and effective recovery of heat brought out through the high-temperature flue gas can be smoothly achieved.

Description

Technical field [0001] The invention relates to a waste heat recovery device, in particular to a multi-point gap type high-temperature flue sensible heat recovery power generation device, which belongs to the technical field of energy saving and environmental protection. Background technique [0002] Electric furnaces such as steelmaking usually have a high-temperature flue, and the high-temperature flue gas passing through the inside is as high as 1400-1600°C. The temperature is usually reduced in the form of a water-cooled flue, that is, a sleeve is set outside the flue gas channel or directly A serpentine tube is arranged adjacent to the wall in the duct, and a large amount of circulating cooling water is passed into the annular gap between the two or the adjacent serpentine tube in the flue. After the low temperature cooling water enters, it absorbs the heat released by the high temperature flue gas, and the temperature rises before entering The external air cooler cools down...

AI Technical Summary

Problems solved by technology

However, this method not only does not recover heat, but also adds a set of air cooling system and circulating water system, which consumes a lot of energy

[0003] In order to recover the waste heat of the high-temperature flue gas of the electric furnace, the water-cooled flue is made into a vaporization cooler, that is, cold water is passed into the lower part of the annular gap, and the upper part generates low-pressure saturated steam, and the heat of the high-temperature flue gas is recovered to a certain extent. However, on the one hand, due to The amount of high-temperature flue gas is large, and the amount of low-pressure saturated steam generated is also large, far exceeding the process requirements. On the other hand, due to the intermittent discharge of high-temperature flue gas from electric furnaces, regardless of the water-cooled flue of circulating cooling water It is still the structure of the vaporization cooler. The channel wall of the high-temperature flue gas works under the alternating temperature of high temperature-low temperature-high temperature-low temperature, which makes the channel wall of the high-temperature flue gas generate great fatigue stress, which is easy to be damaged, and its life is extremely short. Serious Affect the use of these cooling devices and the normal operation of the electric furnace system

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