CN114149054B - Evaporation concentration and power generation combined system and method based on membrane distillation humidification - Google Patents
Evaporation concentration and power generation combined system and method based on membrane distillation humidification Download PDFInfo
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- CN114149054B CN114149054B CN202111459122.3A CN202111459122A CN114149054B CN 114149054 B CN114149054 B CN 114149054B CN 202111459122 A CN202111459122 A CN 202111459122A CN 114149054 B CN114149054 B CN 114149054B
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/447—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by membrane distillation
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Abstract
An evaporation concentration and power generation combined system and method based on membrane distillation humidification belong to the fields of clean power generation systems and industrial wastewater treatment. The system comprises a low-pressure compressor, a high-pressure compressor, a combustion chamber, a turbine, a generator, an intercooler, an aftercooler, a heat regenerator, an economizer, a feed liquid distribution box, a feed liquid return box, an infusion pump, a feed liquid pump, a tubular membrane distiller and a centrifuge. The invention utilizes a plurality of heat exchangers to heat the feed liquid, so that the high-temperature feed liquid transmits water vapor to air required by combustion after penetrating through a membrane in the membrane distiller, the combustion improves the circulation efficiency after the air is humidified, and the high-temperature feed liquid can be concentrated and enter a centrifuge for crystallization operation. The system does not need external water supply, so that water resources are effectively saved, the power circulation efficiency is improved, the concentrated feed liquid crystallization product can be obtained, and the strategic requirements of national energy conservation and emission reduction and water resource sustainable development are met.
Description
Technical Field
The invention relates to an evaporation concentration and power generation combined system and method based on membrane distillation humidification, and belongs to the fields of clean power generation systems and industrial wastewater treatment.
Background
In a conventional wet air turbine cycle, additional water needs to be supplied for air humidification, and the air is humidified and then enters a combustion chamber for combustion, so that the generation of NOx can be reduced, and the output specific work can be increased. However, the realization of the circulation needs to supplement the water continuously, and the water vapor in the turbine exhaust is usually discharged directly and cannot be recycled, thereby causing the waste of water resources and reducing the economical efficiency. Therefore, the feed liquid containing a large amount of water is used as feed water supplement, the feed liquid has a wide range and can be used for various industrial wastewater, the feed liquid is brought into a circulating system, and water vapor is extracted by a membrane distiller and conveyed to air for humidification. In the improved circulation, the multi-stage heat exchanger is adopted to repeatedly utilize the low-temperature waste heat, so that the air required by combustion is humidified, the water resource is effectively saved due to no need of water supply supplement, and the concentrated feed liquid is obtained, can be used for pretreatment of subsequent evaporative crystallization, and has important application value.
Disclosure of Invention
The invention aims to provide an energy-saving and environment-friendly evaporation concentration and power generation combined system and method based on membrane distillation humidification.
Evaporative concentration and power generation combined system based on membrane distillation humidification is characterized by comprising a low-pressure compressor, a high-pressure compressor, a combustion chamber, a turbine, a generator, an intercooler, an after-cooler, a first infusion pump, a feed liquid pump, a second infusion pump, a feed liquid distribution box, a membrane distiller, a feed liquid return box, a third infusion pump, a centrifugal machine, a fourth infusion pump, a heat regenerator and an economizer.
The initial feed liquid is connected with an inlet of a feed liquid pump, an outlet of the feed liquid pump is connected with an inlet of a feed liquid distribution box, a first outlet of the feed liquid distribution box is connected with an inlet of a first infusion pump, an outlet of the first infusion pump is connected with an inlet of a cold end of an intercooler, and an outlet of the cold end of the intercooler is connected with a first inlet of a feed liquid return box; a second outlet of the feed liquid distribution box is connected with an inlet of a second infusion pump, an outlet of the second infusion pump is connected with a cold end inlet of the aftercooler, and an outlet of the cold end of the aftercooler is connected with a second inlet of the feed liquid reflux box; and a third outlet of the feed liquid distribution box is connected with an inlet of a third infusion pump, an outlet of the third infusion pump is connected with a cold end inlet of the economizer, and an outlet of the cold end of the economizer is connected with a third inlet of the feed liquid reflux box. The outlet of the feed liquid reflux box is connected with the inlet of a fourth infusion pump, the outlet of the fourth infusion pump is connected with the inlet at the top of the membrane distiller, and the outlet of concentrated feed liquid at the bottom of the membrane distiller is connected with the inlet of a centrifuge.
The air is connected with the inlet of the low-pressure compressor, the outlet of the low-pressure compressor is connected with the inlet of the hot end of the intercooler, the outlet of the hot end of the intercooler is connected with the inlet of the high-pressure compressor, the outlet of the high-pressure compressor is connected with the inlet of the hot end of the aftercooler, the outlet of the hot end of the aftercooler is connected with the air inlet at the bottom of the membrane distiller, the air outlet at the top of the membrane distiller is connected with the inlet of the cold end of the regenerator, the outlet of the cold end of the regenerator is connected with the air inlet of the combustion chamber, and the flue gas outlet of the combustion chamber is connected with the inlet of the turbine.
The outlet of the turbine is connected with the hot end inlet of the heat regenerator, the outlet of the hot end of the heat regenerator is connected with the hot end inlet of the economizer, and the outlet of the hot end of the economizer is connected with the atmosphere.
The method of the evaporation concentration and power generation combined system based on membrane distillation humidification is characterized by comprising the following processes: in the system, after entering a feed liquid distribution box through a feed liquid pump, feed liquid flows out in three branches, and the first branch enters an intercooler through a first infusion pump to absorb heat and then flows out to return to a feed liquid return box; the second branch enters a post-cooler through a second infusion pump to absorb heat and then returns to the feed liquid return tank; and the third branch enters the economizer through a third infusion pump to absorb the waste heat of the flue gas and then returns to the feed liquid return tank, high-temperature feed liquid in the feed liquid return tank enters from the top of the membrane distiller through a fourth infusion pump to transfer heat and mass with air entering from the bottom, water vapor enters the air from the feed liquid end after penetrating through the porous hydrophobic membrane and is taken away by the air, and the concentrated feed liquid enters the centrifuge to perform subsequent crystallization and other operations after coming out from the bottom of the membrane distiller. Air enters the intercooler and exchanges heat with the first feed liquid after entering the low-pressure compressor and being compressed, then enters the high-pressure compressor and exchanges heat with the second feed liquid in the aftercooler after being compressed, then enters the heat regenerator from the bottom of the membrane distiller and enters the combustion chamber after absorbing water vapor, and finally enters the combustion chamber for combustion after further absorbing the heat of turbine exhaust smoke. And the turbine exhaust smoke enters the hot end inlet of the heat regenerator from the turbine outlet, releases heat to humidify air and then enters the economizer to heat a third feed liquid.
The membrane distiller is an inorganic ceramic membrane.
The intercooler, the aftercooler, the heat regenerator and the economizer adopt tubular heat exchangers.
Compared with the prior art, the invention has at least the following advantages: the invention introduces the membrane distillation technology into the traditional wet air turbine circulation, provides a novel humidification mode for the wet air and effectively utilizes the low-temperature waste heat; meanwhile, the traditional supplementary feed water is replaced by various waste water such as feed liquid and the like, and the concentrated solution is further obtained after passing through the membrane distiller and can be used for subsequent operations such as evaporation crystallization or extraction of various substances. The system can improve the circulating efficiency of the traditional gas turbine, provides a new idea for enterprises to treat various waste liquids, saves water resources, reduces the pollution to the environment and meets the strategic requirements of national energy conservation and emission reduction.
Drawings
FIG. 1 is a combined evaporative concentration and power generation system based on membrane distillation humidification, wherein 1 a low-pressure compressor, 2 a high-pressure compressor, 3 a combustion chamber, 4 turbines, 5 generators, 6 intercoolers, 7 an aftercooler, 8 a first infusion pump, 9 a feed liquid pump, 10 a second infusion pump, 11 a feed liquid distribution box, 12 a membrane distiller, 13 a feed liquid return box, 14 a third infusion pump, 15 a centrifuge, 16 a fourth infusion pump, 17 a heat regenerator and 18 an economizer are arranged in the combined evaporative concentration and power generation system.
Detailed Description
The operation of the combined evaporative concentration and power generation system based on humidification by membrane distillation is described below with reference to fig. 1.
In the system, after entering a feed liquid distribution box through a feed liquid pump, feed liquid flows out in three branches, and a first branch enters an intercooler through a first infusion pump to absorb heat and then flows out to return to a feed liquid return box; the second branch enters a post-cooler through a second infusion pump to absorb heat and then returns to the feed liquid return tank; and the third branch enters the economizer through a third infusion pump to absorb the waste heat of the flue gas and then returns to the feed liquid return tank, high-temperature feed liquid in the feed liquid return tank enters from the top of the membrane distiller through a fourth infusion pump to transfer heat and mass with air entering from the bottom, water vapor enters the air from the feed liquid end after penetrating through the porous hydrophobic membrane and is taken away by the air, and the concentrated feed liquid enters the centrifuge to perform subsequent crystallization and other operations after coming out from the bottom of the membrane distiller. Air enters the intercooler and exchanges heat with the first feed liquid after entering the low-pressure compressor and being compressed, then enters the high-pressure compressor and exchanges heat with the second feed liquid in the aftercooler after being compressed, then enters the heat regenerator from the bottom of the membrane distiller and enters the combustion chamber after absorbing water vapor, and finally enters the combustion chamber for combustion after further absorbing the heat of turbine exhaust smoke. Turbine exhaust gas enters a hot end inlet of the heat regenerator from a turbine outlet, and enters the economizer to heat a third feed liquid after heat is released to humidify air.
Claims (3)
1. An evaporation concentration and power generation combined system based on membrane distillation humidification is characterized by comprising a low-pressure compressor (1), a high-pressure compressor (2), a combustion chamber (3), a turbine (4), a generator (5), an intercooler (6), an aftercooler (7), a first infusion pump (8), a feed liquid pump (9), a second infusion pump (10), a feed liquid distribution box (11), a membrane distiller (12), a feed liquid return box (13), a third infusion pump (14), a centrifugal machine (15), a fourth infusion pump (16), a heat regenerator (17) and an economizer (18);
the initial feed liquid is connected with an inlet of a feed liquid pump (9), an outlet of the feed liquid pump (9) is connected with an inlet of a feed liquid distribution box (11), a first outlet of the feed liquid distribution box (11) is connected with an inlet of a first infusion pump (8), an outlet of the first infusion pump (8) is connected with a cold end inlet of an intercooler (6), and a cold end outlet of the intercooler (6) is connected with a first inlet of a feed liquid return box (13); a second outlet of the feed liquid distribution box (11) is connected with an inlet of a second infusion pump (10), an outlet of the second infusion pump (10) is connected with a cold end inlet of the after-cooler (7), and a cold end outlet of the after-cooler (7) is connected with a second inlet of the feed liquid reflux box (13); a third outlet of the feed liquid distribution box (11) is connected with an inlet of a third infusion pump (14), an outlet of the third infusion pump (14) is connected with a cold end inlet of an economizer (18), and a cold end outlet of the economizer (18) is connected with a third inlet of a feed liquid return box (13); an outlet of the feed liquid reflux box (13) is connected with an inlet of a fourth infusion pump (16), an outlet of the fourth infusion pump (16) is connected with an inlet at the top of the membrane distiller (12), and a concentrated feed liquid outlet at the bottom of the membrane distiller (9) (12) is connected with an inlet of a centrifugal machine (15);
the air is connected with the inlet of a low-pressure compressor (1), the outlet of the low-pressure compressor (1) is connected with the hot end inlet of an intercooler (6), the hot end outlet of the intercooler (6) is connected with the inlet of a high-pressure compressor (2), the outlet of the high-pressure compressor (2) is connected with the hot end inlet of an aftercooler (7), the hot end outlet of the aftercooler (7) is connected with the bottom air inlet of a membrane distiller (12), the top air outlet of the membrane distiller (12) is connected with the cold end inlet of a regenerator (17), the cold end outlet of the regenerator (17) is connected with the air inlet of a combustion chamber (3), and the flue gas outlet of the combustion chamber (3) is connected with the inlet of a turbine (4);
the outlet of the turbine (4) is connected with the hot end inlet of the heat regenerator (17), the hot end outlet of the heat regenerator (17) is connected with the hot end inlet of the economizer (18), and the hot end outlet of the economizer (18) is connected with the atmosphere;
the membrane distiller (12) is an inorganic ceramic membrane.
2. The combined evaporative concentration and power generation system based on humidification by membrane distillation as claimed in claim 1, wherein: the intercooler (6), the aftercooler (7), the heat regenerator (17) and the economizer (18) adopt tubular heat exchangers.
3. The method of the combined evaporative concentration and power generation system based on membrane distillation humidification as claimed in claim 1, comprising the following processes: in the system, after entering a feed liquid distribution box (11) through a feed liquid pump (9), feed liquid flows out in three branches, and the first branch enters an intercooler (6) through a first infusion pump (8) to absorb heat and then flows out to return to a feed liquid return box (13); the second branch enters a post cooler (7) through a second infusion pump (10) to absorb heat and then returns to a feed liquid return tank (13); a third branch enters the economizer (18) through a third infusion pump (14) to absorb the waste heat of the flue gas and then returns to the feed liquid return tank (13), high-temperature feed liquid in the feed liquid return tank (13) enters from the top of the membrane distiller (12) through a fourth infusion pump (16) to perform heat and mass transfer with air entering from the bottom, water vapor enters the air from the feed liquid end after penetrating through the porous hydrophobic membrane and is taken away by the air, and the concentrated feed liquid enters a centrifuge (15) after coming out from the bottom of the membrane distiller (12) to perform subsequent crystallization operation; air enters an intercooler (6) from a low-pressure compressor (1) after being compressed to exchange heat with a first feed liquid, then enters a high-pressure compressor (2) after being compressed to exchange heat with a second feed liquid in a post-cooler (7), then enters a regenerator (17) from the bottom of a membrane distiller (12) after absorbing water vapor, and further enters a combustion chamber (3) after absorbing the heat of exhaust smoke of a turbine (4) to be combusted; the exhaust smoke of the turbine (4) enters a hot end inlet of a heat regenerator (17) from an outlet of the turbine (4), and enters an economizer (18) to heat a third feed liquid after releasing heat to supply humid air.
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Citations (4)
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| CN101417209A (en) * | 2007-10-22 | 2009-04-29 | 天津海之凰科技有限公司 | Energy-saving pressure-reduction distillation device and method |
| CN104929709A (en) * | 2015-04-16 | 2015-09-23 | 集美大学 | Solar moist air circulating electricity-water cogeneration system |
| CN105299784A (en) * | 2015-11-02 | 2016-02-03 | 西安交通大学 | Heat and mass recovery type solution membrane dehumidification system based on membrane distillation and dehumidification method |
| CN107986365A (en) * | 2018-01-09 | 2018-05-04 | 北京龙电宏泰环保科技有限公司 | A kind of fluoroplastics falling film evaporator that desulfurization wastewater concentration is carried out using fume afterheat |
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- 2021-12-02 CN CN202111459122.3A patent/CN114149054B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101417209A (en) * | 2007-10-22 | 2009-04-29 | 天津海之凰科技有限公司 | Energy-saving pressure-reduction distillation device and method |
| CN104929709A (en) * | 2015-04-16 | 2015-09-23 | 集美大学 | Solar moist air circulating electricity-water cogeneration system |
| CN105299784A (en) * | 2015-11-02 | 2016-02-03 | 西安交通大学 | Heat and mass recovery type solution membrane dehumidification system based on membrane distillation and dehumidification method |
| CN107986365A (en) * | 2018-01-09 | 2018-05-04 | 北京龙电宏泰环保科技有限公司 | A kind of fluoroplastics falling film evaporator that desulfurization wastewater concentration is carried out using fume afterheat |
Non-Patent Citations (1)
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