A liquid ammonia evaporator for flue gas denitrification

Abstract

The invention discloses a liquid ammonia evaporator for flue gas denitrification, which comprises an evaporator box, the bottom of the evaporator box is provided with a support base, and the evaporator box includes a vacuum layer, a box shell, a foam layer and a box inner shell , the inside 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 side of the foam layer away from the vacuum layer is provided with a box inner shell, and the inside of the box inner shell is provided with at least two smoke Gas pipes, the inner wall of each flue gas pipe is spirally provided with at least eight smoke nozzles, and the inside of the flue gas pipes located in the evaporator box are spirally interspersed with liquid ammonia coils; the upper right side of the liquid ammonia coils is provided with ammonia Gas outlet, and a liquid ammonia inlet is arranged above the liquid ammonia coil, and a long straight hose is arranged at the rotation center of the spirally arranged liquid ammonia coil; the invention can avoid the need to replace the evaporator in the early stage of liquid ammonia gasification When there is flue gas in the box, the flue gas with heat leaks to cause the problem of heat loss of the flue gas.

Description

technical field [0001] The invention belongs to the technical field of liquid ammonia evaporation devices, and in particular relates 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 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 evaporators for flue gas denitrification have the following problems: 1. When the existing liquid ammonia evaporators for flue gas denitrification use the heat of flue gas to heat liquid ammonia, the dire...

AI Technical Summary

Problems solved by technology

The invention provides a liquid ammonia evaporator for flue gas denitrification, which has the characteristics that the liquid ammonia coil can be heated evenly, the required time is short, the heat preservation effect is good, and the heat loss is greatly reduced; and the invention solves the problem of In the early stage of gasification of liquid ammonia, when the flue gas in the evaporator box needs to be replaced, the flue gas with heat is easy to leak out and cause the heat loss of the flue gas

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