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System and method for recycling water and heat in desulfurized flue gas

A flue gas and moisture technology, applied in the chemical industry, can solve problems such as energy waste, and achieve the effect of reducing the loss of moisture and heat

Inactive Publication Date: 2017-01-04
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a system and method for recovering moisture and heat in desulfurization flue gas in view of the energy waste problem in the prior art of direct discharge of desulfurization flue gas

Method used

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  • System and method for recycling water and heat in desulfurized flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A system for recovering moisture and heat in desulfurization flue gas, the system please refer to figure 1 The structure shown can be seen from the figure:

[0046] The system of the present invention includes a heat pump device, a condensed water recovery device and a smoke exhaust device;

[0047] The heat pump device includes an evaporator 2 for separating out moisture in the desulfurized flue gas, and the evaporator 2 is provided with a flue gas inlet, a flue gas outlet, a condensed water outlet, a refrigerant inlet and a refrigerant outlet;

[0048] Wherein, the flue gas inlet is connected with the desulfurization flue gas outlet of the desulfurization tower 1; the flue gas outlet is connected with the second condenser 4' and the flue gas exhaust tower 7 in turn, and the second condenser 4' is provided with flue gas in parallel. Gas bypass pipe 8;

[0049] The condensed water outlet is respectively provided with a first circuit 9 connected to the top of the desul...

Embodiment 2

[0053] A system for recovering moisture and heat in desulfurized flue gas, the system involved in this embodiment is an improvement made on the basis of Example 1, the improvement is:

[0054] The pipeline between the compressor 3 and the first condenser 4 is provided with a pipeline for introducing refrigerant into the condensing medium inlet of the second condenser 4'; the condensing medium outlet of the second condenser 4' It is connected with the pipeline between the first condenser 4 and the expansion valve 5 through a pipeline.

[0055] A fourth shut-off valve 14 is arranged on the pipeline between the compressor 3 and the first condenser 4, and a fifth shut-off valve 15 is arranged on the pipeline between the first condenser 4 and the expansion valve 5 to guide the refrigerant into the first A third shut-off valve 13 is provided on the pipeline of the condensing medium inlet of the second condenser 4', and a sixth shut-off valve 16 is provided on the pipeline leading th...

Embodiment 3

[0058] A system for recovering moisture and heat in desulfurized flue gas. The system involved in this embodiment is an improvement made on the basis of Embodiment 2. The improvement is: the condensed water passage of the first condenser 4 passes through The pipeline is connected in parallel with the return water pipeline of the hot water supply network, and a water purifier 6 is provided on the second circuit, and the second shut-off valve 12 and the seventh shut-off valve 12 are respectively set on the pipelines where the condensed water enters the water purifier 6 and flows out of the water purifier. Valve 17, the eighth water-saving valve 18 is arranged on the pipe connecting the return water of the hot water supply pipe network with the first condenser 4 .

[0059] The technical solution of this embodiment covers all the technical features of Examples 1 and 2, and also includes the above-mentioned distinguishing technical features, and is the most preferred implementation ...

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Abstract

The invention relates to a system for recycling water and heat in desulfurized flue gas. The system comprises a heat pump device, a condensed water recycling device and a flue gas exhaust device; the heat pump device comprises an evaporator for separating the water in the desulfurized flue gas, a flue gas inlet of the evaporator is connected with a desulfurized flue gas outlet of a desulfurizing tower, a flue gas outlet of the evaporator is connected with the flue gas exhaust device, and a condensed water outlet of the evaporator is connected with the condensed water recycling device; the heat pump device further comprises a compressor, a first condenser and an expansion valve which are sequentially connected with a refrigerant outlet of the evaporator, and the expansion valve is reversely connected to a refrigerant inlet of the evaporator. The system has a waste heat recycling function and a dehumidifying function simultaneously, the water in the flue gas is recycled through the heat pump device to be cyclically utilized on the premise that the working processes of an original desulfurizing system are not changed, and therefore the water saving target is achieved; the heat in the flue gas is recycled through the heat pump device to be used for heating return water of a heating pipe network, and therefore the energy saving target is achieved.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a system and method for recovering moisture and heat in desulfurization flue gas. Background technique [0002] my country is the largest coal consumer in the world, and the thermal power industry is SO 2 The main source of emissions, flue gas desulfurization technology can effectively treat SO 2 Controlling emissions helps protect the environment. Among them, the limestone-gypsum wet flue gas desulfurization process is widely used because of its mature technology, high desulfurization efficiency, abundant sources of absorbent, low price, and availability of by-products. It has become the most widely used method for desulfurization in coal-fired power plants. [0003] Wet desulfurization technology is to make the flue gas enter the wet absorption tower of the desulfurization device, and contact with the alkaline limestone slurry droplets sprayed from top to bottom, an...

Claims

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Application Information

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IPC IPC(8): F23J15/02F25B30/02B01D53/26
CPCB01D53/265F23J15/02F23J2215/20F25B30/02Y02B30/52Y02P80/15
Inventor 杨鲁伟魏娟张振涛孙椰望杨俊玲张冲李博
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI