Flue gas waste heat and moisture recycling system

Abstract

The invention provides a flue gas waste heat and moisture recycling system. The system comprises a membrane condenser and an absorption heat pump circulation system connected with the membrane condenser, and flue gas passing through the membrane condenser is used as a heat source. According to the implementation manner of the flue gas waste heat and moisture recycling system, the absorption heat pump circulation system forms circulation by utilizing the waste heat of flue gas, and low-temperature flue gas does not need to be heated by additional heat, so that the self-circulation purpose of absorbing heat from the high-temperature flue gas and releasing heat to the low-temperature flue gas is realized; and the membrane condenser is used for recovering moisture in the flue gas, recovered water is clean and can supplement water for a boiler, recycling of water resources is achieved, the recovered water can be heated at the position of a condenser, heating heat needed by temperature rise of the recovered water is reduced, and energy consumption of the boiler is reduced. The absorption heat pump circulation system and the membrane condenser are organically combined, the advantages of the absorption heat pump circulation system and the membrane condenser are fully utilized for complementation, and gradient utilization of energy and water heat recovery of wet flue gas are achieved.

Description

technical field [0001] The invention relates to the field of water saving and energy saving, in particular to a system for recycling flue gas waste heat and water. Background technique [0002] The temperature of the flue gas after passing through the desulfurization tower in thermal power plants is relatively low. When the method of condensation first and then heating is used to realize the recovery and utilization of flue gas water vapor, the quality of the waste heat energy of the flue gas is relatively low, so there is little room for deep utilization of the recovered energy. , It takes a lot of high-quality heat sources to heat up the flue gas, and the condensed water produced in the recovery process contacts with the flue gas to make its quality poor. If this part of water resources is to be fully utilized, further processing is required. When the membrane condensation technology is used alone to recover flue gas moisture and waste heat, the temperature of the recovere...

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Problems solved by technology

[0002] The temperature of the flue gas after passing through the desulfurization tower in thermal power plants is relatively low. When the method of condensation first and then heating is used to realize the recovery and utilization of flue gas water vapor, the quality of the waste heat energy of the flue gas is relatively low, so there is little room for deep utilization of the recovered energy. , when the flue gas heats up, it needs to consume a lot of high-quality heat sources. The condensed water produced in the recovery process contacts with the flue gas to make its quality poor. If this part of water resources is to be fully utilized, further processing is required.

When the membrane condensation technology is used alone to recover flue gas moisture and waste heat, the temperature of the recovered water is limited, and the waste heat cannot be effectively utilized, and the amount of recovered water fluctuates greatly according to the change of the flue gas volume, which cannot be effectively controlled independently

When the heat pump method is used to recover the moisture and waste heat of the flue gas, it is often used to heat the flue gas or absorb heat from the flue gas, but the temperature difference of the flue gas at different positions cannot be effectively and fully utilized, resulting in a waste of energy, and often in the system The water collector is used to recover the condensed water in the flue gas, resulting in direct contact between the condensed water and the flue gas, resulting in poor quality of recovered water

[0003] In order to overcome the shortcomings of the above-mentioned prior art, the present invention combines the advantages of the above-mentioned technology to provide a thermal power plant boiler flue gas waste heat and water efficient recovery and utilization system, which combines the traditional condensation method, the second type of absorption heat pump technology and membrane condensation The advantages of the technology can make full use of the waste heat of the flue gas and efficiently recover the heat of the flue gas system; without using additional high-quality energy, the temperature of the exhaust gas can be increased, and the supplementary water consumption of the power plant can be effectively reduced by recycling high-quality cooling water. It solves the problems of low heat exchange efficiency, poor recycled water quality, complex parameter adjustment, high equipment operating costs, poor "whitening" effect and low exhaust gas temperature in the process of flue gas waste heat utilization, which is of great significance to energy saving and emission reduction

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