Natural gas flue gas dehumidification waste heat reuse system

Abstract

The invention provides a natural gas flue gas moisture removal waste heat recycling system. The natural gas flue gas moisture removal waste heat recycling system comprises a finned tube heat exchanger, a rotary flue gas moisture removal device and a flue gas source heat pump. The flue gas is cooled through heat exchange by the finned tube heat exchanger, the cooled wet flue gas is adsorbed with moisture by the rotary flue gas moisture removal device to reduce the water vapor content, the flue gas enters a second-stage evaporator of the heat pump to exchange heat with a refrigerant for furthercooling and then is exhausted into the atmosphere, and a moisture removal agent which is heated and humidified is used for preheating outdoor inlet air and cooling for recycling. The heated and humidified outdoor inlet air enters a first-stage evaporator of the heat pump to exchange heat with the refrigerant, the heat released by a condenser is used to heat cold water, and the heated water entersthe finned tube heat exchanger to exchange heat with the flue gas for further heating and is used to heat domestic water for heating users. By the adoption of the system, the recovery rate of waste heat of the natural gas flue gas can be remarkably increased, the cold water is heated step by step, and the moisture removal agent dries and converts the wet flue gas into dry flue gas, so that the investment and operation cost is reduced, the possibility of low-temperature corrosion is reduced, and the economic benefits are remarkable.

Description

technical field [0001] The invention relates to the technical field of flue gas waste heat recovery systems, in particular to a natural gas flue gas dehumidification waste heat reuse system, which belongs to the field of energy and power engineering systems. Background technique [0002] As a high-quality, high-efficiency clean fuel, the promotion and application of natural gas in civil and industrial fields has great practical significance for environmental protection. Natural gas boilers have gradually occupied a dominant position in the heating field because of their high thermal efficiency. Natural gas is a fossil energy with a high calorific value and is easy to burn cleanly, but it is non-renewable. The cumulative consumption of natural gas in 2017 was 237.3 billion cubic meters, an increase of 15.3% compared with 2016. Therefore, it is very important to improve the energy utilization rate of natural gas and reduce operating costs . [0003] The flue gas from natural...

AI Technical Summary

Problems solved by technology

The flue gas source heat pump hot water system can directly and efficiently recover low-temperature flue gas waste heat, improve the waste heat recovery rate, and greatly reduce the exhaust gas temperature. High equipment investment and operating costs

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