Heat accumulation type trans-critical flue gas waste heat recovery device

Abstract

The invention relates to a heat accumulating type trans-critical flue gas waste heat recovery device, which is characterized in that the recovery device comprises an outer cylinder body, an inner cylinder body, a liquid collection cone, a gas distribution core, rotating blades, and a heat accumulator, wherein the upper end of the outer cylinder body is provided with a flue gas outlet and an air inlet, and the outer cylinder body is sleeved at the lower end of the inner cylinder body; the lower end of the outer cylinder body is connected with the liquid collection cone; the upper end of the inner cylinder is provided with a flue gas inlet and an air outlet, the lower end of the inner cylinder body is provided with a heat accumulator support, and the heat accumulator is placed on the heat accumulator support in the inner cylinder body; and the lower end of the heat accumulator support in the inner cylinder body is provided with the gas distribution core, and the rotating blades are arranged between the inner cylinder body and the gas distribution core. The recovery device has the advantages that the recovery device can recover trans-critical waste heat of flue gas and heat of evaporation latent heat, save a large quantity of energy sources, and reduce the emission of acid gas due to the fact that the acid gas in the flue gas after waste heat recovery can saturate to precipitate at a dew point.

Description

1. Technical field [0001] The invention relates to an industrial flue gas transcritical waste heat recovery equipment, in particular to a utilization of transcritical low-temperature heat from the waste heat of a heating furnace or reactor tail gas in petroleum refining and chemical and coal chemical processes. It belongs to the technical field of petroleum refining, chemical industry, and coal chemical process energy saving. It can also be used in ceramics, metallurgy, building materials, electric power and other fields. 2. Background technology [0002] In the fields of petroleum refining, chemical industry, and coal chemical industry, when the flue gas is lower than the dew point, it will cause serious dew point corrosion of equipment such as FCC regenerator, convection section of heating furnace, furnace wall, boiler air preheater, pipeline cecum, etc. Due to the nitrogen and sulfur elements in the fuel, NOx and SO are generated during combustion 2 , SO 3 , when the f...

AI Technical Summary

Problems solved by technology

In order to avoid dew point corrosion during operation, a certain margin will be added to the flue gas temperature above the dew point. Generally, the exhaust gas temperature is higher than 170°C, and some are even higher than 250°C. The flue gas is discharged, resulting in waste heat waste, heat pollution and acid gas pollution

At present, there is no real device that can recover the waste heat of the flue gas at a temperature below the dew point of the flue gas

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