CN213824132U - High-efficient compound flue gas moisture recovery system - Google Patents

High-efficient compound flue gas moisture recovery system Download PDF

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Publication number
CN213824132U
CN213824132U CN202022721310.6U CN202022721310U CN213824132U CN 213824132 U CN213824132 U CN 213824132U CN 202022721310 U CN202022721310 U CN 202022721310U CN 213824132 U CN213824132 U CN 213824132U
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China
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heat exchanger
condensing heat
condensing
exchange tube
flue gas
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CN202022721310.6U
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Chinese (zh)
Inventor
王一坤
张广才
柳宏刚
蔡文博
周平
魏星
周凌宇
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Xian Thermal Power Research Institute Co Ltd
Xian Xire Boiler Environmental Protection Engineering Co Ltd
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Xian Thermal Power Research Institute Co Ltd
Xian Xire Boiler Environmental Protection Engineering Co Ltd
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Abstract

The utility model discloses a high-efficiency composite flue gas moisture recovery system, wherein a tail flue is communicated with an inlet of a chimney through a first condensing heat exchanger, a second condensing heat exchanger, a third condensing heat exchanger, a fourth condensing heat exchanger and a demister in sequence, heat exchange tube bundles in the first condensing heat exchanger and the third condensing heat exchanger are horizontally arranged, and heat exchange tube bundles in the second condensing heat exchanger and the fourth condensing heat exchanger are vertically arranged; the heat exchange tube bundle in the first condensation heat exchanger is connected with the heat exchange tube bundle in the third condensation heat exchanger in series, the heat exchange tube bundle in the second condensation heat exchanger is connected with the heat exchange tube bundle in the fourth condensation heat exchanger in series, the system is high in heat exchange efficiency, and meanwhile, the recovery of moisture in the flue gas can be realized.

Description

High-efficient compound flue gas moisture recovery system
Technical Field
The utility model belongs to thermal power equipment field relates to a high-efficient compound flue gas moisture recovery system.
Background
The flue gas generated after the fuel of the coal-fired boiler is combusted contains a large amount of moisture, and the emission of the moisture into the atmosphere not only causes great water resource waste, but also causes the corrosion and scaling of a chimney when the moisture in the flue gas meets the condition that the moisture is condensed and forms water in the chimney and flows down along the wall surface. The water in the flue gas is recycled and recycled, and the method has important significance for the construction and economic development of energy bases in water resource deficient areas in China.
The wet flue gas desulfurization, which is the most widely applied flue gas desulfurization technology of the existing coal-fired power station boiler, has the remarkable advantages of mature technology, high desulfurization efficiency and the like, but also has the defect of high water consumption rate. The water in the flue gas is recycled by adopting the technical means, so that the water-saving device has a remarkable water-saving effect and is a necessary choice for realizing energy-saving and water-saving operation of a coal-fired power plant.
After the moisture in the flue gas is condensed, a large amount of pollutants such as fine particles and NH4 +、SOxAnd Hg and other harmful substances are removed together, and even the wet flue gas desulfurization with zero water consumption can be realized. The recycling of a large amount of condensed water can also reduce the water consumption of a power plant, which has great significance for developing the power industry in the western region of China with rich coal and less water.
Aiming at recovering moisture in flue gas of a power plant, three technologies of cooling condensation, liquid absorption and membrane separation are mainly researched at present. The cooling and condensing technology has better engineering adaptability relatively aiming at the characteristics of large flow and high dust content of coal-fired flue gas, but the prior art has the defects of low heat exchange efficiency and incapability of effectively recovering moisture in the flue gas.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a high-efficient compound flue gas moisture recovery system, the heat exchange efficiency of this system is high, can realize the recovery to moisture in the flue gas simultaneously.
In order to achieve the purpose, the high-efficiency composite flue gas moisture recovery system comprises a tail flue, a first condensation heat exchanger, a second condensation heat exchanger, a third condensation heat exchanger, a fourth condensation heat exchanger, a demister and a chimney;
the tail flue is communicated with an inlet of the chimney through a first condensing heat exchanger, a second condensing heat exchanger, a third condensing heat exchanger, a fourth condensing heat exchanger and a demister in sequence, and a bottom condensed water outlet of the first condensing heat exchanger, a bottom condensed water outlet of the second condensing heat exchanger, a bottom condensed water outlet of the third condensing heat exchanger, a bottom condensed water outlet of the fourth condensing heat exchanger and a bottom water outlet of the demister are communicated with an inlet of the water collecting tank;
heat exchange tube bundles in the first condensation heat exchanger and the third condensation heat exchanger are horizontally arranged, and heat exchange tube bundles in the second condensation heat exchanger and the fourth condensation heat exchanger are vertically arranged;
and the heat exchange tube bundle in the first condensation heat exchanger is connected with the heat exchange tube bundle in the third condensation heat exchanger in series, and the heat exchange tube bundle in the second condensation heat exchanger is connected with the heat exchange tube bundle in the fourth condensation heat exchanger in series.
The device also comprises a condensed water collecting tank, wherein the condensed water collecting tank is positioned right below the outlet at the bottom of the water collecting tank.
The number of the heat exchange tube bundles in the fourth condensing heat exchanger is more than that of the heat exchange tube bundles in the first condensing heat exchanger, the second condensing heat exchanger and the third condensing heat exchanger.
The utility model discloses following beneficial effect has:
high-efficient compound flue gas moisture recovery system at the during operation, the flue gas carries out the heat exchange with the coolant in the heat exchanger tube bank among first condensation heat exchanger, second condensation heat exchanger, third condensation heat exchanger and the fourth condensation heat exchanger, wherein, the heat exchanger tube bank among first condensation heat exchanger and the third condensation heat exchanger is established ties, the heat exchanger tube bank among second condensation heat exchanger and the fourth condensation heat exchanger is established ties, can increase heat transfer temperature and pressure, improves heat exchange efficiency. Meanwhile, the heat exchange tube bundles in the second condensation heat exchanger and the fourth condensation heat exchanger are vertically arranged, so that the effect of efficiently collecting condensed liquid drops can be achieved. The heat exchange tube bundles of the fourth condenser are more in number, so that the effect of efficiently intercepting liquid drops can be achieved, and the working pressure of the demister is reduced. The temperature of the flue gas is reduced to be lower than the dew point of the water vapor, so that the water vapor in the flue gas is condensed, and NH in the flue gas4 +、SO2And the harmful substances such as the fine particles, Hg and the like dissolved in water are removed by the condensed water, so that the corrosion and scaling of a boiler chimney are effectively prevented, meanwhile, the condensed water can be used for water for a desulfurizing tower or water supplement of a boiler, the problem of water resource shortage can be relieved, and the method has good social and economic benefits.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is a first condensing heat exchanger, 2 is a second condensing heat exchanger, 3 is a third condensing heat exchanger, 4 is a fourth condensing heat exchanger, 5 is a demister, 6 is a condensate water collecting tank, and 7 is a chimney.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1, the high-efficiency composite flue gas moisture recovery system of the present invention includes a tail flue, a first condensing heat exchanger 1, a second condensing heat exchanger 2, a third condensing heat exchanger 3, a fourth condensing heat exchanger 4, a demister 5 and a chimney 7; the tail flue is communicated with an inlet of a chimney 7 through a first condensing heat exchanger 1, a second condensing heat exchanger 2, a third condensing heat exchanger 3, a fourth condensing heat exchanger 4 and a demister 5 in sequence, and a bottom condensed water outlet of the first condensing heat exchanger 1, a bottom condensed water outlet of the second condensing heat exchanger 2, a bottom condensed water outlet of the third condensing heat exchanger 3, a bottom condensed water outlet of the fourth condensing heat exchanger 4 and a bottom water outlet of the demister 5 are communicated with an inlet of a water collecting tank; heat exchange tube bundles in the first condensing heat exchanger 1 and the third condensing heat exchanger 3 are horizontally arranged, and heat exchange tube bundles in the second condensing heat exchanger 2 and the fourth condensing heat exchanger 4 are vertically arranged; the heat exchange tube bundle in the first condensing heat exchanger 1 is connected with the heat exchange tube bundle in the third condensing heat exchanger 3 in series, and the heat exchange tube bundle in the second condensing heat exchanger 2 is connected with the heat exchange tube bundle in the fourth condensing heat exchanger 4 in series.
The utility model also comprises a condensed water collecting pool 6, wherein, the condensed water collecting pool 6 is positioned under the outlet at the bottom of the water collecting tank; the number of the heat exchange tube bundles in the fourth condensing heat exchanger 4 is more than that of the heat exchange tube bundles in the first condensing heat exchanger 1, the second condensing heat exchanger 2 and the third condensing heat exchanger 3.
The heat exchange tube bundles in the first condensing heat exchanger 1 and the third condensing heat exchanger 3 are made of metal materials, and the heat exchange tube bundles in the second condensing heat exchanger 2 and the fourth condensing heat exchanger 4 are made of metal materials or nonmetal materials.
The medium used for condensing the flue gas in the heat exchange tube bundles in the demister 5, the first condensing heat exchanger 1, the second condensing heat exchanger 2, the third condensing heat exchanger 3 and the fourth condensing heat exchanger 4 can be water, air or other fluid medium.
The utility model discloses a concrete working process does:
1) flue gas after combustion of the coal-fired power plant boiler enters a tail flue, then is subjected to heat exchange and temperature reduction sequentially through a first condensing heat exchanger 1, a second condensing heat exchanger 2, a third condensing heat exchanger 3 and a fourth condensing heat exchanger 4, so that water vapor in the flue gas reaches a supersaturated state, is subjected to phase change condensation by taking fine particles in the flue gas as condensation nuclei, and finally falls into a water collecting tank under the action of gravity;
2) the flue gas after heat exchange and temperature reduction enters a demister 5 to remove water vapor, and then is discharged through a chimney 7, wherein the water vapor removed in the demister 5 is condensed and then enters a water collecting tank.
The utility model discloses be in the characteristics of nearly saturation or oversaturation state to wet flue gas desulfurization tower export flue gas humidity, make the flue gas temperature reduce to below the vapor dew point through the condensation heat transfer to make the vapor in the flue gas reach the oversaturation state and use the fine particle in the flue gas to take place the phase transition for the condensation nucleus and condense, NH in the flue gas4 +、SO2And the harmful substances such as the fine particles, Hg and the like dissolved in water can be removed by the condensed water, so that the corrosion and scaling of the boiler chimney 7 can be effectively prevented, meanwhile, the condensed water can be used for water for a desulfurizing tower or water supplement of a boiler, the problem of water resource shortage can be relieved, and the method has good social and economic benefits.

Claims (3)

1. A high-efficiency composite flue gas moisture recovery system is characterized by comprising a tail flue, a first condensing heat exchanger (1), a second condensing heat exchanger (2), a third condensing heat exchanger (3), a fourth condensing heat exchanger (4), a demister (5) and a chimney (7);
the tail flue is communicated with an inlet of a chimney (7) through a first condensing heat exchanger (1), a second condensing heat exchanger (2), a third condensing heat exchanger (3), a fourth condensing heat exchanger (4) and a demister (5) in sequence, and a bottom condensed water outlet of the first condensing heat exchanger (1), a bottom condensed water outlet of the second condensing heat exchanger (2), a bottom condensed water outlet of the third condensing heat exchanger (3), a bottom condensed water outlet of the fourth condensing heat exchanger (4) and a bottom water outlet of the demister (5) are communicated with an inlet of a water collecting tank;
heat exchange tube bundles in the first condensing heat exchanger (1) and the third condensing heat exchanger (3) are horizontally arranged, and heat exchange tube bundles in the second condensing heat exchanger (2) and the fourth condensing heat exchanger (4) are vertically arranged;
the heat exchange tube bundle in the first condensing heat exchanger (1) is connected with the heat exchange tube bundle in the third condensing heat exchanger (3) in series, and the heat exchange tube bundle in the second condensing heat exchanger (2) is connected with the heat exchange tube bundle in the fourth condensing heat exchanger (4) in series.
2. The efficient composite flue gas moisture recovery system according to claim 1, further comprising a condensate water collection tank (6), wherein the condensate water collection tank (6) is located directly below the outlet at the bottom of the water collection tank.
3. The high-efficiency composite flue gas moisture recovery system according to claim 1, wherein the number of the heat exchange tube bundles in the fourth condensing heat exchanger (4) is greater than the number of the heat exchange tube bundles in the first condensing heat exchanger (1), the second condensing heat exchanger (2) and the third condensing heat exchanger (3).
CN202022721310.6U 2020-11-23 2020-11-23 High-efficient compound flue gas moisture recovery system Active CN213824132U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202022721310.6U CN213824132U (en) 2020-11-23 2020-11-23 High-efficient compound flue gas moisture recovery system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202022721310.6U CN213824132U (en) 2020-11-23 2020-11-23 High-efficient compound flue gas moisture recovery system

Publications (1)

Publication Number Publication Date
CN213824132U true CN213824132U (en) 2021-07-30

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202022721310.6U Active CN213824132U (en) 2020-11-23 2020-11-23 High-efficient compound flue gas moisture recovery system

Country Status (1)

Country Link
CN (1) CN213824132U (en)

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