CN113339830A - Coal-fired unit flue gas moisture and waste heat recovery utilize system based on pottery embrane method - Google Patents
Coal-fired unit flue gas moisture and waste heat recovery utilize system based on pottery embrane method Download PDFInfo
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- CN113339830A CN113339830A CN202110316740.6A CN202110316740A CN113339830A CN 113339830 A CN113339830 A CN 113339830A CN 202110316740 A CN202110316740 A CN 202110316740A CN 113339830 A CN113339830 A CN 113339830A
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- water
- heat exchanger
- ceramic membrane
- flue gas
- micron
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B1/00—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser
- F28B1/02—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser using water or other liquid as the cooling medium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/04—Auxiliary systems, arrangements, or devices for feeding, collecting, and storing cooling water or other cooling liquid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/08—Auxiliary systems, arrangements, or devices for collecting and removing condensate
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a coal-fired unit flue gas moisture and waste heat recycling system based on a ceramic membrane method. The core elements of the system are a nano ceramic membrane heat exchanger and a micron ceramic membrane heat exchanger. Under the action of a capillary condensation mechanism, the nano-film ceramic heat exchanger recovers heat and moisture from flue gas before desulfurization, the recovered moisture is used as boiler water supplement and is added into a hot well of a condenser, and the recovered heat heats condensed water flowing between low-temperature heaters. Under the action of film-shaped condensation, the micron film ceramic heat exchanger recovers moisture from the desulfurized flue gas, and the recovered moisture enters a cooling tower to supplement circulating cooling water.
Description
Technical Field
The invention relates to a coal-fired unit flue gas moisture and waste heat recycling system based on a ceramic membrane method, and belongs to the technical field of energy conservation.
Background
In 2017, the total amount of water resources in China is 28761.2 billions of cubic meters, which accounts for about 6 percent of the total amount of water resources in the world. As a large consumer with water consumption, the thermal power industry has been used for a long time, and as long as 2018, the installed capacity of power generation in China is 19 hundred million kilowatts, and the total installed capacity of thermal power is 11.437 hundred million kilowatts, which accounts for 60.2% of the total installed capacity. According to statistics, more than 41% of thermal power generating units are limited by water resource shortage. However, about 10% of water vapor exists in the exhaust gas of the power plant, and for a unit burning high-moisture coal, the water vapor content in the exhaust gas even exceeds 20%, and if the water vapor can be reasonably recycled, the water consumption of the thermal power unit is greatly reduced.
In China, most of the existing coal-fired units recover the waste heat of flue gas before desulfurization by placing a low-temperature economizer. However, the flue gas before desulfurization contains a large amount of sulfur dioxide gas, and when the flue gas is condensed on the surface of a metal pipe of the low-temperature economizer, the sulfur dioxide is dissolved in the condensed liquid to form an acidic solution, so that the low-temperature economizer and the flue are corroded.
The hydrophilic nano ceramic membrane and the hydrophilic micro ceramic membrane have strong high temperature resistance, high pressure resistance and corrosion resistance, and can work in a harsh coal-fired unit flue gas environment.
Disclosure of Invention
The invention designs a coal-fired unit flue gas moisture and waste heat recycling system based on a ceramic membrane method, which realizes the application of a capillary condensation technology and a membrane condensation technology on a porous membrane material.
By utilizing a capillary condensation technology, water vapor in the flue gas is condensed into liquid water in pores of the nano ceramic membrane; by utilizing a film-shaped condensation technology, water vapor in the flue gas is condensed into liquid water on the outer surface of the micron ceramic membrane pipe; liquid water formed by condensation under the drive of the pressure difference between the inside and the outside of the membrane tube permeates into the ceramic membrane tube and is converged into cooling water for recycling.
The nano ceramic membrane heat exchanger mainly comprises a hydrophilic ceramic membrane with the aperture of 0.1-50 nanometers, and is arranged in front of the desulfurizing tower and behind the induced draft fan; a water channel of the nano ceramic membrane heat exchanger is connected into the water-water heat exchanger to exchange heat with the condensed water between the No. 6 low-temperature heater and the No. 7 low-temperature heater; the micron ceramic membrane heat exchanger mainly comprises a ceramic membrane with the aperture of 0.5-5 microns and is arranged behind the desulfurizing tower; the water channel is connected with a circulating cooling water system of the condenser in parallel, inlet water is from a cooling water pool of the cooling tower, and outlet water and cooling return water of the condenser are converged into the cooling tower; under the action of the circulating water pump, the micro-negative pressure operation condition in the pipe required by the ceramic membrane heat exchanger for recovering water is met; the nano ceramic membrane heat exchanger and the micron ceramic membrane heat exchanger have similar structures, and the difference is that the used ceramic membranes are different.
The invention has the beneficial effects that:
(1) the water recovered by the nano ceramic membrane heat exchanger can be used as boiler water supplement and is continuously supplemented into a condenser hot well;
(2) the heat recovered by the nano ceramic membrane heat exchanger can heat the condensed water flowing in the low-temperature heater;
(3) the water recovered by the micron ceramic membrane heat exchanger can enter a cooling tower to supplement circulating cooling water.
Drawings
FIG. 1 is a schematic diagram of a flue gas moisture and waste heat utilization system of a coal-fired unit;
fig. 2 is a structural view of a ceramic membrane heat exchanger.
Claims (4)
1. The utility model provides a coal-fired unit flue gas moisture and waste heat recovery utilizes system based on pottery embrane method which characterized in that: the system consists of a nano ceramic membrane heat exchanger, a micron ceramic membrane heat exchanger, a water-water heat exchanger, a low-temperature heater, an air preheater, a dust remover, an induced draft fan, a desulfurizing tower, a small circulating water pump, a valve, a condensate pump, a circulating water pump, a cooling tower, an expansion water tank and a condenser.
2. The system of claim 1, wherein: the nano ceramic membrane heat exchanger consists of hydrophilic ceramic membranes with the aperture within the range of 0.1-50 nanometers; the nano ceramic membrane heat exchanger is positioned in front of the desulfurizing tower and behind the induced draft fan and is used for treating the original flue gas before desulfurization; the heat energy recovered by the nano ceramic membrane heat exchanger is taken away by cooling water flowing through the ceramic membrane tube, and the heat energy is used for heating condensed water after passing through the water-water heat exchanger; a small self-priming pump is arranged at the outlet end of the nano ceramic membrane heat exchanger to ensure that the ceramic membrane tube is in a micro-negative pressure state during operation; under the action of capillary condensation, water vapor in the flue gas is condensed into liquid water in pores of the nano ceramic membrane, and the liquid water permeates into the ceramic membrane tube under the driving of the pressure difference between the inside and the outside of the membrane tube and is converged into cooling water for recovery.
3. The system of claim 1, wherein: the micron ceramic membrane heat exchanger consists of ceramic membranes with the aperture ranging from 0.5 to 5 microns; the micron ceramic membrane heat exchanger is positioned behind the desulfurizing tower and is used for treating the purified flue gas after desulfurization; a water channel of the micron ceramic membrane heat exchanger is connected in parallel with a circulating cooling water system of the condenser, inlet water is from a cooling water pool of the cooling tower, and outlet water and cooling return water of the condenser are converged into the cooling tower; the outlet end of the micron ceramic membrane heat exchanger is positioned in front of the circulating water pump, so that the ceramic membrane tube is in a micro-negative pressure state during operation; under the action of film-shaped condensation, water vapor in the flue gas is condensed into liquid water on the outer surface of the micron ceramic film tube, and the liquid water permeates into the ceramic film tube under the driving of the pressure difference between the inside and the outside of the film tube and is converged into cooling water for recovery.
4. The system of claim 1, wherein: when the coal-fired unit operates, the flue gas flows through the air preheater and the dust remover, is led out under the suction action of the draught fan, flows into the nano ceramic membrane heat exchanger, and is condensed to release heat; under the action of a small self-priming pump, clean circulating water circularly flows in the water-water heat exchanger and the nano ceramic membrane heat exchanger, absorbs the heat of flue gas in the nano ceramic membrane heat exchanger, and releases the heat in the water-water heat exchanger; condensed water from the outlet of the No. 7 low-temperature heater enters a water-water heat exchanger to absorb heat, and enters the No. 6 low-temperature heater after being heated; the water recovered by the nano ceramic membrane heat exchanger can be used as boiler water supplement and is continuously supplemented into a condenser hot well; the temperature of the flue gas is greatly reduced after passing through the nano ceramic heat exchanger, and then the flue gas enters a desulfurizing tower to remove oxysulfide, so that the water consumption for desulfurization is greatly reduced due to the reduction of the temperature of the flue gas; the desulfurized flue gas enters a micron ceramic membrane heat exchanger to further release heat; the water recovered by the micron ceramic membrane heat exchanger can enter a cooling tower to supplement circulating cooling water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110316740.6A CN113339830A (en) | 2021-03-25 | 2021-03-25 | Coal-fired unit flue gas moisture and waste heat recovery utilize system based on pottery embrane method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110316740.6A CN113339830A (en) | 2021-03-25 | 2021-03-25 | Coal-fired unit flue gas moisture and waste heat recovery utilize system based on pottery embrane method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113339830A true CN113339830A (en) | 2021-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110316740.6A Pending CN113339830A (en) | 2021-03-25 | 2021-03-25 | Coal-fired unit flue gas moisture and waste heat recovery utilize system based on pottery embrane method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114225589A (en) * | 2021-12-15 | 2022-03-25 | 东莞理工学院 | Pollutant removal, moisture and waste heat recovery integrated device and method based on hydrophilic hollow fiber membrane |
| CN115382341A (en) * | 2022-08-29 | 2022-11-25 | 重庆赛迪热工环保工程技术有限公司 | Method and system for eliminating white and treating sewage of blast furnace granulated slag exhaust funnel |
Citations (6)
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|---|---|---|---|---|
| FR2717560A1 (en) * | 1994-03-18 | 1995-09-22 | Acbrm Ste Nouvelle | Heat recovery exchanger for exhaust gas flue of heater etc. |
| JP2017089611A (en) * | 2015-11-05 | 2017-05-25 | 株式会社東芝 | System for recovering steam in power generation exhaust gas, fire power generation system and method for recovering steam in power generation exhaust gas |
| CN107166367A (en) * | 2017-06-21 | 2017-09-15 | 华北电力大学 | A kind of fume afterheat and moisture recovery system based on ceramic membrane heat exchanger |
| CN108087902A (en) * | 2017-12-13 | 2018-05-29 | 华北电力大学（保定） | Steam latent heat and water reclamation system and its recovery method and control method in power-plant flue gas |
| CN108905567A (en) * | 2018-08-15 | 2018-11-30 | 佛山赛因迪环保科技有限公司 | A kind of smoke processing system of Production of Ceramics |
| CN109812828A (en) * | 2019-02-19 | 2019-05-28 | 东莞理工学院 | A kind of moisture and waste heat recycling system based on the wet recyclable device of ceramic membrane heat |
-
2021
- 2021-03-25 CN CN202110316740.6A patent/CN113339830A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2717560A1 (en) * | 1994-03-18 | 1995-09-22 | Acbrm Ste Nouvelle | Heat recovery exchanger for exhaust gas flue of heater etc. |
| JP2017089611A (en) * | 2015-11-05 | 2017-05-25 | 株式会社東芝 | System for recovering steam in power generation exhaust gas, fire power generation system and method for recovering steam in power generation exhaust gas |
| CN107166367A (en) * | 2017-06-21 | 2017-09-15 | 华北电力大学 | A kind of fume afterheat and moisture recovery system based on ceramic membrane heat exchanger |
| CN108087902A (en) * | 2017-12-13 | 2018-05-29 | 华北电力大学（保定） | Steam latent heat and water reclamation system and its recovery method and control method in power-plant flue gas |
| CN108905567A (en) * | 2018-08-15 | 2018-11-30 | 佛山赛因迪环保科技有限公司 | A kind of smoke processing system of Production of Ceramics |
| CN109812828A (en) * | 2019-02-19 | 2019-05-28 | 东莞理工学院 | A kind of moisture and waste heat recycling system based on the wet recyclable device of ceramic membrane heat |
Non-Patent Citations (1)
| Title |
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| 陈海平等: "火电厂烟气水分及余热陶瓷膜法回收实验", 《热力发电》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114225589A (en) * | 2021-12-15 | 2022-03-25 | 东莞理工学院 | Pollutant removal, moisture and waste heat recovery integrated device and method based on hydrophilic hollow fiber membrane |
| CN115382341A (en) * | 2022-08-29 | 2022-11-25 | 重庆赛迪热工环保工程技术有限公司 | Method and system for eliminating white and treating sewage of blast furnace granulated slag exhaust funnel |
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