Waste heat recovery process and device

Abstract

The invention discloses a waste heat recovery process. The waste heat recovery process can fully recover exhaust emission heat energy and burn non-condensable gas, heat exchange circulation high-concentration sewage id discharged into a collecting tank and then into a sewage treatment system for treatment, and exhaust emission heat energy is recovered through two-stage heat absorption and accumulation. The invention also provides a waste heat recovery device. The waste heat recovery heat fully absorbs and utilizes exhaust waste heat and meanwhile achieves harmless treatment on the non-condensable gas to achieve zero-pollution emission. The waste heat recovery device is simple in operation, safe in working and free from pollution, and can meet demands on scale production, save cost and achieve high in economic benefits.

Description

technical field [0001] The invention relates to a waste heat recovery process, in particular to a waste heat recovery process and equipment thereof, and belongs to the technical field of waste gas heat recovery and reuse for energy-saving and environment-friendly production. Background technique [0002] In the fields of chemical industry, pulping and papermaking, food fermentation, and biomedicine, exhaust gas emissions will cause energy waste and environmental pollution. Under the pressure of energy saving and environmental protection, waste heat recovery has become an industry development trend, and the sources of exhaust gas are intermittent and disorderly. , the current situation of unstable production, etc. is not conducive to recycling and full utilization. At present, the existing technology mainly adopts the washing tower washing process, through the direct heat exchange between the vapor phase and the liquid phase in the tower, and reverse washing to recover the was...

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Problems solved by technology

[0002] In the fields of chemical industry, pulping and papermaking, food fermentation, and biomedicine, exhaust gas emissions will cause energy waste and environmental pollution. Under the pressure of energy saving and environmental protection, waste heat recovery has become an industry development trend, and the sources of exhaust gas are intermittent and disorderly. , the current situation of unstable production, etc. is not conducive to recycling and full utilization. At present, the existing technology mainly adopts the washing tower washing process, through the direct heat exchange between the vapor phase and the liquid phase in the tower, and reverse washing to recover the waste heat of the exhaust gas. Although certain effects have been achieved, but The disposal of non-condensable waste gas and the full absorption and utilization of latent heat have not achieved satisfactory results

[0003] Due to the current situation of intermittent, disordered and unstable generation of waste gas, scrubbers are used to absorb the waste heat of waste gas, and stable replacement heat and sewage cannot be obtained for reuse. The treatment of non-condensable waste gas is mainly carried out in the form of high-altitude disorderly discharge. The exhaust gas has not been completely disposed of; the harmful substances contained in the high-pollutant exhaust gas are absorbed and dissolved in the hot sewage, and there is a secondary release of exhaust gas during reuse and the accumulation of pollutants in the process; due to the unstable discharge flow of exhaust gas, The latent heat absorption and replacement of waste gas; it is impossible to fully absorb and fully utilize the heat source

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