Waste gas afterheat recovery system

Abstract

The invention provides a waste gas afterheat recovery system which has high heat recovery utilization rate. The waste gas afterheat recovery system comprises a heat exchanger, a chimney and an afterheat recoverer, wherein an air inlet and an air outlet of the afterheat recoverer are communicated with the chimney; the heat exchanger comprises a first water inlet, a first water outlet, a second water inlet and a second water outlet, wherein the first water inlet is communicated with the first water outlet and the second water inlet is communicated with the second water outlet by respectively utilizing pipelines inside the heat exchanger; the first water inlet is communicated with the water outlet of the afterheat recoverer through a water inlet pipe; the water inlet pipe is sequentially provided with a water inlet valve and a first control valve; the first water outlet is communicated with the water inlet of the afterheat recoverer through a water outlet pipe; the water outlet pipe is sequentially provided with a water outlet valve, a water pump and a second control valve; the first water inlet is also communicated with the first water outlet through a water passing pipe arranged outside the heat exchanger; and the water passing pipe is provided with a third control valve. The waste gas afterheat recovery system can enhance the recovery utilization rate of heat contained in waste gases by utilizing the water as a medium.

Description

technical field [0001] The invention belongs to the technical field of energy recovery and reuse, and in particular relates to a waste gas waste heat recovery system. Background technique [0002] Energy conservation and environmental protection are not only social responsibilities for enterprises, but also can save fuel expenses, improve economic benefits, and enhance market competitiveness. Compared with developed countries, my country's industrial equipment is backward and energy utilization rate is low, such as chemical industry, building materials, textile, machinery, automobile, metallurgy, power, papermaking, food, electronics and other industries, a large amount of available heat energy is directly emptied during production , which wastes energy and pollutes the environment. If this part of wasted heat energy is recycled, energy utilization can be improved, production costs can be reduced, and the environment can be protected. [0003] For example, in the production ...

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Problems solved by technology

[0003] For example, in the production process of automobiles, the exhaust gas generated during the coating and drying process needs to be treated by an exhaust gas incinerator to meet the national secondary emission standards. The exhaust gas treated by the exhaust gas incinerator is about 800 °C , the waste heat of this part of the waste gas is generally recovered to be used for auxiliary heating of the drying furnace or internal circulation of the waste gas treatment device. The discharge temperature of the waste gas treated by the above technology can be reduced to about 190°C, obviously there is still a certain degree of heat energy waste

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