CN215161150U - Low-temperature multi-effect seawater desalination process system taking flue gas as heat source - Google Patents
Low-temperature multi-effect seawater desalination process system taking flue gas as heat source Download PDFInfo
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- CN215161150U CN215161150U CN202120673476.7U CN202120673476U CN215161150U CN 215161150 U CN215161150 U CN 215161150U CN 202120673476 U CN202120673476 U CN 202120673476U CN 215161150 U CN215161150 U CN 215161150U
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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
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- Y02A20/124—Water desalination
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Abstract
The utility model relates to an use low temperature multiple-effect sea water desalination's of flue gas as heat source process system, including the flash distillation plant that is used for producing steam, this flash distillation plant has hot water inlet pipe and cold water outlet pipe way, hot water inlet pipe and cold water outlet pipe way connect flash distillation plant, the steam that this flash distillation produced first imitates steam inlet through first tube coupling low temperature multiple-effect sea water desalination device, the condensation water that the first effect of low temperature multiple-effect sea water desalination device produced returns flash distillation plant through the second pipeline, flue gas heat exchanger is connected to flash distillation plant's hot water inlet pipe and cold water outlet pipe way opposite side, flue gas heat exchanger installs in the flue between boiler air preheater and the dust remover, perhaps install on the flue between draught fan and desulphurization unit, near flash distillation plant installs near the first effect steam inlet of sea water desalination device. The utility model provides an use low temperature multiple-effect sea water desalination device of power plant exhaust flue gas as the heat source is favorable to reducing sea water desalination system water cost.
Description
Technical Field
The utility model relates to a sea water desalination field especially relates to an use low temperature multiple-effect sea water desalination device of power plant exhaust heat flue gas source as heat source.
Background
The water resource is a generic term of fresh water resource which can be utilized by human under certain economic and technical conditions. Water shortage is a global problem. Large-scale seawater desalination is an effective way to solve the crisis of fresh water.
The distillation method for sea water desalination is suitable for large-scale fresh water preparation, but needs to consume a large amount of heat energy. Aiming at the operation characteristics of coastal thermal power plants, the power plants generate a large amount of waste heat, such as flue gas with a certain temperature at the outlet of a boiler. On the other hand, in order to obtain desalinated water, the power plant needs to extract steam from the steam turbine to desalinate seawater to produce water.
SUMMERY OF THE UTILITY MODEL
The technical problem solved by the utility model is to provide a low-temperature multi-effect seawater desalination process system using flue gas as heat source, which is characterized in that the boiler of a power plant is used for discharging smoke as the heat source, thereby solving the problem that a large amount of heat energy is consumed for seawater desalination and reducing the cost of seawater desalination for water production.
The technical means adopted by the utility model are as follows.
A process system for low-temperature multi-effect seawater desalination by taking flue gas as a heat source comprises a flash evaporation device for generating steam, wherein the steam generated by the flash evaporation device enters a low-temperature multi-effect seawater desalination device for first effect through a first pipeline, and condensed water generated by the seawater desalination device for first effect returns to the flash evaporation device through a second pipeline; the flash evaporation device is provided with a hot water inlet pipeline and a cold water outlet pipeline, the hot water inlet pipeline and the cold water outlet pipeline are connected with a flue gas heat exchanger, the flue gas heat exchanger is provided with a hot flue gas inlet and a cold flue gas outlet, the flue gas heat exchanger is used for absorbing the heat of flue gas, the hot flue gas inlet is connected with the hot flue gas exhausted by a power plant through a flue gas pipeline, and the cold flue gas outlet is connected with a dust remover through an outlet flue gas pipeline; and the flash evaporation device is provided with a water replenishing pipeline for replenishing water to the flash evaporation device.
Preferably, the flue gas heat exchanger is located at a flue between the boiler air preheater and the boiler dust remover, or at a flue between the induced draft fan and the desulfurizing tower.
Preferably, the temperature of the hot flue gas entering the flue gas heat exchanger is 130 ℃, and the temperature of the flue gas at the outlet of the flue gas heat exchanger is 90 ℃; the temperature of the low-temperature circulating water generated by the flash evaporation device is about 65 ℃, and the temperature of the circulating water heated by the flue gas heat exchanger is increased to 120 ℃, and the circulating water is liquid water at 120 ℃.
The utility model discloses produced beneficial effect as follows.
The utility model discloses can reduce the hot cost of sea water desalination system water through utilizing the low-grade flue gas heat of power plant's flue gas to system water cost. The utility model discloses owing to adopt hot water as heat transfer's medium for the arrangement of sea water desalination device is very nimble, can arrange near the flue, does to arrange in the position far away from the boiler flue.
The utility model discloses except being applied to desalting the sea water, can also use low temperature multiple-effect distillation method principle to prepare the demineralized water, adopt this method, be favorable to reducing the cost that the demineralized water of power plant was prepared.
Drawings
Fig. 1 is a specific structural block diagram of the present invention.
Description of the figure numbers:
1. the system comprises a low-temperature multi-effect seawater desalination device, a first pipeline, a second pipeline, a flash evaporation device, a hot water inlet pipeline, a cold water outlet pipeline, a flue gas heat exchanger, a hot flue gas inlet, a cold flue gas outlet, a flue gas pipeline, a hot flue gas inlet, a cold flue gas outlet, a hot flue gas pipeline, a cold flue gas pipeline and a water replenishing pipeline.
Detailed Description
The utility model provides an use low temperature multiple effect sea water desalination's of flue gas as heat source process system, its heat source comes from the flue gas of boiler air preheater export or boiler draught fan export, and the following explains for the example after taking from the air preheater with the flue gas before the dust remover.
Referring to fig. 1, the utility model relates to a low temperature multiple-effect sea water desalination device using flue gas as heat source, which comprises a flash evaporation device 3 for generating steam, a flue gas heat exchanger 2 arranged on a boiler flue, and a conventional low temperature multiple-effect sea water desalination device.
Flash distillation unit 3 has hot water inlet pipe 31 and cold water outlet pipe way 32, hot water inlet pipe 31 and cold water outlet pipe way 32 connect gas heater 2, this gas heater 2 has hot gas inlet 21 and cold exhanst gas outlet 22, this hot gas inlet 21 passes through flue gas pipeline 20 and connects the exhaust hot flue gas of power plant, cold exhanst gas outlet 22 passes through export flue gas pipeline and connects the dust remover, gas heater 2 locates the cold water that is used for absorbing the flue gas heat and transmits the heat to cold water outlet pipe way 32 on the flue gas pipeline, realize the thermal recycle of flue gas.
In addition, the flash evaporation device 3 is also provided with a water replenishing pipeline 33 for replenishing water to the flash evaporation device 3 according to requirements.
The flue gas heat exchanger 2 is usually installed in a flue between a boiler air preheater and a boiler dust remover as shown in the figure, and can also be installed between an induced draft fan and a desulfurizing tower, namely, the hot flue gas utilized by the flue gas heat exchanger 2 is usually the hot flue gas exhausted by the boiler air preheater or the hot flue gas after the boiler induced draft fan.
The flash evaporation apparatus 1 is a steam generation apparatus, and functions to generate saturated steam, and to generate corresponding low-pressure saturated steam and saturated water by reducing pressure using hot water. When the system operates, hot water enters the flash evaporation device 3, low-pressure saturated steam is generated through pressure reduction, the low-pressure saturated steam enters the first effect 1 of the low-temperature multi-effect seawater desalination device through the first pipeline 11, condensed water generated by the first effect 1 of the low-temperature multi-effect seawater desalination device returns to the flash evaporation device 3 through the second pipeline 12, the first effect 1 of the low-temperature multi-effect seawater desalination device produces water through gradual effect according to a traditional mode, and the matched application of the flash evaporation device 3 and the first effect 1 of the low-temperature multi-effect seawater desalination device is completed.
Meanwhile, the temperature of low-temperature circulating water generated by the flash evaporation device 3 is about 65 ℃, the low-temperature circulating water is pressurized by a circulating water pump and then enters the flue gas heat exchanger 2 for heating, the temperature of the heated circulating water can be increased to about 120 ℃, the temperature of 120 ℃ is still liquid water, the high-temperature circulating water returns to the flash evaporation device 3 to participate in the flash evaporation process, the pressure is reduced, the boiling point is reduced, and saturated steam is generated.
The hot flue gas of 130 ℃ enters the flue gas heat exchanger 2 through the flue gas pipeline 20, and the flue gas cooled to 90 ℃ in the flue gas heat exchanger 2 enters the dust remover, and then passes through the induced draft fan and the desulphurization device in sequence, and finally is discharged into the atmosphere.
Steam generated by the last effect of the seawater desalination device is cooled by a condenser. The seawater desalination device and related equipment are the prior art, and a person skilled in the art can arrange related equipment such as a water replenishing port, a water discharging port, a pipeline, a pump and the like according to requirements.
As illustrated below, the turbine system calculates the related flue gas parameters of a certain 660MW coal-fired unit and estimates the performance of the process system by combining the technical parameters of the current 2.5 ten thousand tons/day low-temperature multi-effect equipment.
The specific evaluation values are shown in the following table.
As can be seen from the calculation results in the table above, if the flue gas waste heat is completely utilized, 8700t of desalted water can be produced by a single 660MW unit, and the water yield is considerable.
The utility model discloses can utilize the waste heat of thermal power factory flue gas to carry out seawater desalination to greatly reduced seawater desalination uses hot cost, reduces the system water cost.
In addition, the temperature of the flue gas entering the desulfurization device is reduced, so that the system is favorable for reducing the water consumption of desulfurization operation.
The utility model discloses owing to adopt hot water as heat transfer's medium for the arrangement of sea water desalination device is very nimble, easily engineering implementation.
Finally, for a thermal power plant in a non-coastal region, the system principle can be adopted to prepare the demineralized water, so that the preparation cost of the demineralized water of the power plant is reduced.
Claims (3)
1. A low-temperature multi-effect seawater desalination process system taking flue gas as a heat source is characterized by comprising a flash evaporation device (3) for generating steam, wherein the steam generated by the flash evaporation device (3) enters a first effect (1) of the low-temperature multi-effect seawater desalination device through a first pipeline (11), and condensed water generated by the first effect (1) of the seawater desalination device returns to the flash evaporation device (3) through a second pipeline (12);
the flash evaporation device (3) is provided with a hot water inlet pipeline (31) and a cold water outlet pipeline (32), the hot water inlet pipeline (31) and the cold water outlet pipeline (32) are connected with the flue gas heat exchanger (2), the flue gas heat exchanger (2) is provided with a hot flue gas inlet (21) and a cold flue gas outlet (22), the flue gas heat exchanger (2) is used for absorbing flue gas heat, the hot flue gas inlet (21) is connected with hot flue gas exhausted by a power plant through a flue gas pipeline (20), and the cold flue gas outlet (22) is connected with a dust remover through an outlet flue gas pipeline;
and the flash evaporation device (3) is provided with a water replenishing pipeline (33) for replenishing water for the flash evaporation device (3).
2. The low-temperature multi-effect seawater desalination process system taking flue gas as a heat source as claimed in claim 1, wherein the flue gas heat exchanger (2) is positioned at a flue between the boiler air preheater and the boiler dust remover or at a flue between the induced draft fan and the desulfurizing tower.
3. The low-temperature multi-effect seawater desalination process system taking flue gas as a heat source as claimed in claim 1, wherein the temperature of hot flue gas entering the flue gas heat exchanger (2) is 130 ℃, and the temperature of flue gas at the outlet of the flue gas heat exchanger (2) is 90 ℃;
the temperature of the low-temperature circulating water generated by the flash evaporation device (3) is about 65 ℃, the temperature of the circulating water heated by the flue gas heat exchanger (2) is increased to 120 ℃, and the circulating water is liquid water with the temperature of 120 ℃.
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| CN202120673476.7U CN215161150U (en) | 2021-04-01 | 2021-04-01 | Low-temperature multi-effect seawater desalination process system taking flue gas as heat source |
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| CN202120673476.7U CN215161150U (en) | 2021-04-01 | 2021-04-01 | Low-temperature multi-effect seawater desalination process system taking flue gas as heat source |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114906896A (en) * | 2022-04-27 | 2022-08-16 | 东方电气集团东方锅炉股份有限公司 | Low-temperature multi-effect seawater desalination system based on heat source utilization |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114906896A (en) * | 2022-04-27 | 2022-08-16 | 东方电气集团东方锅炉股份有限公司 | Low-temperature multi-effect seawater desalination system based on heat source utilization |
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