Damp and hot tail gas treatment process and system

Abstract

The invention provides a damp and hot tail gas treatment process and system. The damp and hot tail gas treatment process comprises the following steps: (1) dedusting tail gas through a dedusting device; (2) introducing tail gas treated by the dedusting device into a heat-absorbing unit of a heat pump system to perform heat absorbing, cooling, condensing and dehumidifying treatment, so that the residual heat of the tail gas is lowered to 55 DEG C or less; (3) performing secondary cooling and dedusting treatment on the tail gas which is subjected to heat absorption and cooling through wet dust collection. By adopting the tail gas treatment process, the tail gas is introduced into the heat-absorbing unit of the heat pump system after being subjected to primary dedusting with the dedusting device, and a large amount of heat in the tail gas is taken away by the heat-absorbing unit of the heat pump system to cause sudden drop of the temperature, so that the temperature of the tail gas can be lowered to 55 DEG C or less, dedusting water is prevented from evaporating in a wet dust collection stage, precipitation of dust in the tail gas is facilitated, the dust is absorbed by moisture for wet dust collection, and the haze phenomenon is avoided.

Description

technical field [0001] The invention relates to industrial tail gas treatment, in particular to a wet heat tail gas treatment process and system. Background technique [0002] In recent years, smog has become serious in some areas, and environmental problems have risen to a new height, which has had a serious negative impact on the national economy and people's livelihood. Energy conservation, emission reduction, and eradication of smog have become important livelihood projects and important measures advocated by the state and enterprises. With the development of industry, the emission of industrial tail gas is more serious. Usually, most of the industrial tail gas is directly discharged after simple treatment, which is far from meeting the environmental protection requirements. Common industrial exhaust gases include boiler exhaust, material preheating exhaust, drying exhaust, etc. The exhaust exhaust not only has a high temperature, which can reach more than 100 degrees, b...

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Problems solved by technology

[0004] However, when this kind of treatment equipment is used for tail gas treatment, the heat exchange process of the heat exchange device is that the exhaust gas overflows the excess heat and exchanges heat with the water in the heat exchange tube. Due to the limited heat exchange efficiency of this heat exchange method, the exhaust gas After the heat exchange by the heat exchange device, the residual temperature is still relatively high, so the heat of the exhaust gas higher than the atmospheric temperature is wasted, and the heat recovery rate is low

Moreover, the residual temperature of the exhaust gas is high, the molecular movement is violent, and the flow rate is relatively large. When passing through the washing and absorbing device and the spraying device, the water in the washing and absorbing device and the spraying device will also evaporate, resulting in the waste of this part of industrial water. Water sources also greatly increase production costs

In addition, when the residual temperature of the exhaust gas is high, the air molecules move violently and the flow velocity is large, and the fine dust and PM2.5 particles in the exhaust gas also move violently, which is not conducive to settlement and is not easy to be absorbed by spraying. exacerbated the smog

Therefore, this tail gas treatment process is very limited for water and heat recovery, and is not conducive to preventing smog

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