Liquid ammonia evaporator for flue gas denitration

Abstract

The invention belongs to the technical field of liquid ammonia evaporation devices, and in particular, relates to a liquid ammonia evaporator for flue gas denitration. The liquid ammonia evaporator comprises an evaporator box body; a supporting base is arranged at the bottom of the evaporator box body; the evaporator box body comprises a vacuum layer, a box body outer shell, a foam layer and a boxbody inner shell; the vacuum layer is arranged on the inner side of the box body outer shell; the foam layer is arranged on one side, away from the box body outer shell, of the vacuum layer; a box body inner shell is arranged on one side, far away from the vacuum layer, of the foam layer; a plurality of flue gas pipelines are arranged in the box body inner shell; a plurality of flue gas sprayingopenings are formed in an inner ring of each flue gas spraying pipeline. According to the liquid ammonia evaporator, a traditional straight pipe flue gas pipeline is arranged to be an annular flue gaspipeline, and the plurality of flue gas spraying openings are formed in the inner ring; the plurality of layers of annular flue gas pipelines are arranged, a liquid ammonia coil pipe is surrounded by360 degrees from top to bottom, the sufficiency and uniformity of heating of the liquid ammonia coil pipe are guaranteed, and the working efficiency of the liquid ammonia evaporator is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of liquid ammonia evaporation devices, in particular to a liquid ammonia evaporator for flue gas denitrification. Background technique [0002] Flue gas denitrification is another important field for the country to control pollutant emissions from thermal power plants after the first-level flue gas desulfurization. For the flue gas denitrification of thermal power plants, ammonia gas is mainly used as the reducing agent, and nitrogen oxides are converted into harmless nitrogen gas through ammonia gas. And water vapor, ammonia gas is mainly produced by the evaporation of liquid ammonia. The existing liquid ammonia evaporator has some defects in heating and heat preservation. [0003] The prior art liquid ammonia evaporator for flue gas denitrification has the following problems: [0004] 1. When the existing liquid ammonia evaporator for flue gas denitrification uses the heat of the flue gas to heat the liqu...

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Problems solved by technology

[0004] 1. When the existing liquid ammonia evaporator for flue gas denitrification uses the heat of the flue gas to heat the liquid ammonia, the direct contact area is small, and the heat of the flue gas needs to be gradually diffused to heat the liquid ammonia as a whole, which takes a long time , and the whole liquid ammonia will be heated unevenly;

[0005] 2. The existing liquid ammonia evaporator for flue gas denitrification has no heat preservation measures, which will cause the waste heat of the flue gas to be lost, resulting in a waste of resources;

[0006] 3. During the utilization of flue gas heat, most of the flue gas with heat is discharged, and the heat utilization rate is low

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