Efficient ammonia recovery device

Abstract

The invention discloses an efficient ammonia recovery device which comprises a storage unit (1), and a filler unit (4), a heat exchange unit (3) and a separating and defoaming unit (2) are sequentially mounted at the top of the storage unit (1) in a communicating manner. A heat exchange pipe (34) in the heat exchange unit (3) is vertically arranged, so that ammonia-containing gas in the heat exchange pipe (34) is cooled, part of ammonia gas is condensed and coalesced to form liquid drops of low-temperature liquid ammonia, the liquid drops fall into a filler layer (45) of the filler unit (4), and a top cavity of the separation and defoaming unit (2) is communicated with a cold energy recovery unit (6) in a liquid phase space of the storage unit (1) through a communicating pipe (5). The ammonia recovery device is compact in structure, small in occupied area, low in investment, safe and reliable, liquid ammonia separated from ammonia-containing gas and the ammonia-containing gas can be mixed through the filler, mass and heat transfer is efficient, latent heat and sensible heat of the liquid ammonia and sensible heat of low-temperature gas can be fully utilized, and the comprehensive utilization rate of heat energy is high.

Description

technical field [0001] The invention belongs to the technical fields of chemical industry and ammonia refrigeration, and in particular relates to a device for recovering ammonia from gas containing ammonia in the synthetic ammonia industry or in an ammonia refrigeration system. Integrated high-efficiency ammonia recovery device. Background technique [0002] The ammonia content in the flash gas, vent air and purge gas of the synthetic ammonia industry is relatively high, generally 10-60% (volume), and the ammonia content in the purge gas of the ammonia refrigeration system of the synthetic ammonia industry or the ammonia refrigeration system of other industries can be the highest. Up to 90% (volume) or more, if simple direct discharge or combustion is used, it will cause serious environmental pollution and waste of energy. With the intensification of the dual crisis of energy and environment, it is imperative to save energy and reduce emissions in factories. At present, th...

AI Technical Summary

Problems solved by technology

The energy converter (expander), the core equipment of the device, operates at a very high speed and needs to reach more than 50,000 rpm to obtain high refrigeration efficiency. It is not suitable for occasions with small gas volume and large fluctuations, and if the The change of gas composition, especially the hydrogen content in the venting is relatively large, the efficiency of the energy converter decreases sharply, and the insufficient cooling capacity leads to the deterioration of the operation of the device

Therefore, the reliability of the device operation of this method is not strong, the operation flexibility is small, and the number of heat exchangers and separators is large, and the investment and maintenance costs are high.

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