CN112426853A - Efficient composite flue gas moisture recovery system and method - Google Patents
Efficient composite flue gas moisture recovery system and method Download PDFInfo
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- CN112426853A CN112426853A CN202011318076.0A CN202011318076A CN112426853A CN 112426853 A CN112426853 A CN 112426853A CN 202011318076 A CN202011318076 A CN 202011318076A CN 112426853 A CN112426853 A CN 112426853A
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- heat exchanger
- condensing heat
- flue gas
- condensing
- exchange tube
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/265—Drying gases or vapours by refrigeration (condensation)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D49/00—Separating dispersed particles from gases, air or vapours by other methods
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
Abstract
The invention discloses a high-efficiency composite flue gas moisture recovery system and a method, 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; 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.
Description
Technical Field
The invention belongs to the field of thermal power generation equipment, and relates to a high-efficiency composite flue gas moisture recovery system and method.
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.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an efficient composite flue gas moisture recovery system and method, which have high heat exchange efficiency and can realize the recovery of moisture in flue gas.
In order to achieve the aim, the efficient 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 method for efficiently recovering the composite flue gas moisture comprises the following steps:
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 through a first condensing heat exchanger, a second condensing heat exchanger, a third condensing heat exchanger and a fourth condensing heat exchanger in sequence, 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) and the flue gas after heat exchange and temperature reduction enters a demister again to remove water vapor, and then is discharged through a chimney, wherein the water vapor removed from the demister enters a water collecting tank after being condensed.
The invention has the following beneficial effects:
when the efficient composite flue gas moisture recovery system works, flue gas exchanges heat with cooling media in heat exchange tube bundles in the first condensation heat exchanger, the second condensation heat exchanger, the third condensation heat exchanger and the fourth condensation heat exchanger, wherein the heat exchange tube bundles in the first condensation heat exchanger and the third condensation heat exchanger are connected in series, and the heat exchange tube bundles in the second condensation heat exchanger and the fourth condensation heat exchanger are connected in series, so that heat transfer temperature and pressure can be increased, and heat exchange efficiency is improved. 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 invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the efficient composite flue gas moisture recovery system of the invention comprises 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 invention also comprises a condensed water collecting tank 6, wherein the condensed water collecting tank 6 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 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 method for efficiently recovering the composite flue gas moisture comprises the following steps:
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.
Aiming at the characteristic that the humidity of the flue gas at the outlet of the wet flue gas desulfurization tower is in a nearly saturated or supersaturated state, the temperature of the flue gas is reduced to be below the dew point of water vapor through condensation heat exchange, so that the water vapor in the flue gas reaches the supersaturated state, phase change condensation is carried out by taking fine particles in the flue gas as condensation nuclei, and 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 (4)
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).
4. The method for recovering the moisture in the high-efficiency composite flue gas is characterized by comprising the following steps of:
1) flue gas after combustion of the coal-fired power station 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) for removing 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011318076.0A CN112426853A (en) | 2020-11-23 | 2020-11-23 | Efficient composite flue gas moisture recovery system and method |
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| CN202011318076.0A CN112426853A (en) | 2020-11-23 | 2020-11-23 | Efficient composite flue gas moisture recovery system and method |
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| CN112426853A true CN112426853A (en) | 2021-03-02 |
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| CN202011318076.0A Pending CN112426853A (en) | 2020-11-23 | 2020-11-23 | Efficient composite flue gas moisture recovery system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113156049A (en) * | 2021-05-08 | 2021-07-23 | 西安热工研究院有限公司 | Flue gas moisture retrieves experimental apparatus |
| CN115814578A (en) * | 2023-02-09 | 2023-03-21 | 中国电建集团华东勘测设计研究院有限公司 | Water vapor recovery energy-saving box system of hydrogen-burning energy supply device |
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2020
- 2020-11-23 CN CN202011318076.0A patent/CN112426853A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113156049A (en) * | 2021-05-08 | 2021-07-23 | 西安热工研究院有限公司 | Flue gas moisture retrieves experimental apparatus |
| CN115814578A (en) * | 2023-02-09 | 2023-03-21 | 中国电建集团华东勘测设计研究院有限公司 | Water vapor recovery energy-saving box system of hydrogen-burning energy supply device |
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