A liquid ammonia evaporator for flue gas denitrification

Abstract

The invention belongs to the technical field of liquid ammonia evaporating devices, in particular to a liquid ammonia evaporator for flue gas denitrification, comprising an evaporator box, the bottom of the evaporator box is provided with a support base, and the evaporator box is It includes a vacuum layer, a box shell, a foam layer and a box inner shell. The inner side of the box shell is provided with a vacuum layer. The side of the vacuum layer away from the box shell is provided with a foam layer. The foam layer is far away from the vacuum layer. One side of the box is provided with a box inner shell, and a plurality of flue gas pipes are arranged inside the box inner shell. The gas pipeline is set as a circular flue gas pipeline, and the inner ring is equipped with multiple smoke nozzles, and is equipped with a multi-layer circular flue gas pipeline, which surrounds the liquid ammonia coil 360 degrees from top to bottom, ensuring that the liquid ammonia coil The sufficiency and uniformity of heating greatly enhance the working efficiency of the liquid ammonia evaporator.

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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