Twin-stage absorption type boiler flue gas treatment system

Abstract

The invention provides a twin-stage absorption type boiler flue gas treatment system which comprises a condensation unit, a first absorber, a first regenerator, a second absorber and a second regenerator, wherein a boiler is sequentially connected with and communicates with the first regenerator, the condensation unit, the first absorber and the second absorber through a flue gas pipeline; the first regenerator communicates with the first absorber through a first liquid inlet pipe and a first liquid discharging pipe; the first regenerator communicates with the second regenerator through a steam pipeline; the second regenerator communicates with the second absorber through a second liquid inlet pipe and a second liquid discharging pipe; and the second regenerator communicates with the boiler through a combustion air pipe. The twin-stage absorption type boiler flue gas treatment system can realize the following effects with lower cost: effectively recycling waste heat and moisture of flue gas, preventing soluable nitric oxide in flue gas from polluting moisture absorption solution, and reducing content of nitric oxide in discharged smoke.

Description

technical field [0001] The invention relates to the technical field of boiler flue gas treatment, in particular to a two-stage absorption boiler flue gas treatment system. Background technique [0002] With the advancement of the "coal to gas" project, the application of gas boilers in heating is becoming more and more extensive. The moisture content (water vapor content) of gas-fired boiler exhaust is much higher than that of coal-fired boilers, and the water vapor carries a large amount of latent heat, so there is great potential for waste heat recovery. The existing flue gas waste heat recovery methods mainly include condensing waste heat recovery (condensing boiler), electric compression heat pump waste heat recovery, closed absorption heat pump waste heat recovery, and open absorption waste heat recovery system based on solution dehumidification technology. [0003] However, in the existing waste heat and water recovery process, it is found that using a pure electric c...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a two-stage absorption boiler flue gas treatment system to solve the problem of high cost of flue gas treatment, pollution caused by nitrogen oxides in the flue gas to the hygroscopic solution of the open absorption type system, and reduction of nitrogen oxides. underperforming problems

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