CN112441690A - RO seawater desalination device inlet seawater heating system based on waste heat recovery of thermal power generating unit - Google Patents
RO seawater desalination device inlet seawater heating system based on waste heat recovery of thermal power generating unit Download PDFInfo
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- CN112441690A CN112441690A CN202011312110.3A CN202011312110A CN112441690A CN 112441690 A CN112441690 A CN 112441690A CN 202011312110 A CN202011312110 A CN 202011312110A CN 112441690 A CN112441690 A CN 112441690A
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- 239000013535 sea water Substances 0.000 title claims abstract description 126
- 238000010612 desalination reaction Methods 0.000 title claims abstract description 61
- 239000002918 waste heat Substances 0.000 title claims abstract description 27
- 238000010438 heat treatment Methods 0.000 title claims abstract description 23
- 238000011084 recovery Methods 0.000 title claims abstract description 20
- 239000000498 cooling water Substances 0.000 claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 238000010521 absorption reaction Methods 0.000 claims abstract description 24
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000012528 membrane Substances 0.000 description 6
- 238000001223 reverse osmosis Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000013505 freshwater Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 206010027336 Menstruation delayed Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/10—Energy recovery
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses an RO seawater desalination device inlet seawater heating system based on waste heat recovery of a thermal power generating unit, wherein a steam exhaust port of a low-pressure cylinder in the thermal power generating unit is communicated with a heat release side inlet of a condenser, an outlet of a circulating cooling water pipeline is divided into two paths, one path is communicated with a heat absorption side inlet of the condenser, a heat absorption side outlet of the condenser is communicated with a circulating water feed pipeline, the other path is communicated with an outlet of a seawater pump, a low-temperature seawater pipeline is communicated with an inlet of a seawater pump, an outlet of the seawater pump is communicated with a heat absorption side inlet of a plate type water-water heat exchanger, a heat absorption side outlet of the plate type water-water heat exchanger is communicated with an inlet of the RO seawater desalination device and a heat absorption side inlet of the condenser, a closed type cooling water input pipeline is communicated with a heat release side of the plate type water-water heat exchanger, the efficiency of RO seawater desalination is improved, and the recovery of waste heat of the thermal power generating unit is realized.
Description
Technical Field
The invention belongs to the technical field of seawater desalination of large-scale thermal power plants, and relates to an RO seawater desalination device inlet seawater heating system based on waste heat recovery of a thermal power generating unit.
Background
Reverse osmosis membrane (RO) sea water desalination technology uses a reverse osmosis membrane module as a main functional device for separating fresh water and salt, and a reverse osmosis membrane is a semipermeable membrane and can allow water to permeate and intercept salt and impurities. RO was initially used for water purification and subsequently generalized to brackish water desalination, beginning in the eighties of the last century for seawater desalination. Research and development of RO seawater desalination technology and engineering construction in China are almost synchronously carried out with foreign countries, since the late period of the last eighties, a large number of RO seawater desalination devices are successively built from islands to lands in China, once the RO seawater desalination devices occupy more than 90% of the domestic seawater desalination production capacity, the scale of the RO seawater desalination devices is from hundreds of tons to thousands of tons per day, and at present, some ten thousand tons to hundred thousand tons are from ten thousand tons to ten thousand tonsThe RO seawater desalination bases of the stages are put into use successively, and the largest device reaches 2.0 multiplied by 104t/d。
The optimum working temperature of the RO membrane is about 25 ℃, and the seawater temperature has great influence on the RO desalination rate and the energy consumption. From the world, the main areas for seawater desalination are the middle east, north africa, south europe, australia, southeast asia, california, central america and the like, which are located in tropical regions, and the influence of seawater temperature on the RO seawater desalination capacity and energy consumption is not concerned. However, coastal fresh water severe shortage areas in China are mainly concentrated in the north of the Yangtze river, particularly in the area of the China's Bohai and Bohai, the temperature of sea water is about 0 ℃ in winter, and even if power plant sea water circulating water is used, the temperature of the sea water is not higher than 10 ℃, so that the requirement difference of the temperature of a sea water inlet of the RO sea water desalination device at a normal working temperature of 25 ℃ in winter is too large, the water production capacity of the RO sea water desalination device is greatly reduced, the problem is an important problem in China in the development of the sea water desalination industry, and the actual water production cost of RO sea water desalination projects in China is also seriously influenced.
According to statistics of reverse osmosis seawater desalination engineering running in the Bohai Bay region, the yield is reduced all the year around due to the fact that the temperature of the seawater in winter is reduced, and the influence coefficient of the temperature of the seawater in the Bohai Bay region on the water yield is 0.82, so that the unit cost of seawater desalination in winter and even all the year around is greatly increased.
Taking a certain Bohai sea power plant in Bohai of a certain Bohai in northern China as an example, the theoretical calculation cost of the RO seawater desalination project with the capacity of 15000t/d is proposed to be 4.73 yuan/t, and the seawater desalination cost is increased by 1.04 yuan/t all the year round by considering the influence of the water temperature in winter to reach 5.77 yuan/t.
Therefore, the RO seawater desalination efficiency is obviously influenced by the seawater temperature. For coastal areas in north of Yangtze river in China, the requirement that the temperature of seawater in winter is obviously lower than 25 ℃ seriously influences the RO seawater desalination efficiency and cost.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an RO seawater desalination device inlet seawater heating system based on thermal power unit waste heat recovery, which can effectively reduce the RO seawater desalination cost, improve the RO seawater desalination efficiency and simultaneously realize the recovery of the thermal power unit waste heat.
In order to achieve the purpose, the RO seawater desalination device inlet seawater heating system based on waste heat recovery of the thermal power generating unit comprises a condenser, a circulating cooling water pipeline, a circulating water feed pipeline, a seawater pump, a low-temperature seawater pipeline, a plate-type water-water heat exchanger, an RO seawater desalination device, a closed cooling water input pipeline and a closed cooling water output pipeline;
the steam exhaust port of the low-pressure cylinder in the thermal power unit is communicated with the heat release side inlet of the condenser, the outlet of the circulating cooling water pipeline is divided into two paths, one path of the outlet is communicated with the heat absorption side inlet of the condenser, the heat absorption side outlet of the condenser is communicated with the circulating water feed pipeline, the other path of the outlet is communicated with the outlet of the seawater pump, the low-temperature seawater pipeline is communicated with the inlet of the seawater pump, the outlet of the seawater pump is communicated with the heat absorption side inlet of the plate-type water-water heat exchanger, the heat absorption side outlet of the plate-type water-water heat exchanger is communicated with the inlet of the RO seawater desalination device and the heat absorption side inlet of the condenser, and the closed cooling water input pipeline is communicated.
The outlet of the circulating cooling water pipeline is divided into two paths after passing through the first valve and the circulating water pump.
The outlet of the heat absorption side of the condenser 1 is communicated with a circulating water feed pipeline through a second valve.
The circulating cooling water pipeline is communicated with the outlet of the seawater pump through a third valve.
The low-temperature seawater pipeline is communicated with the inlet of the seawater pump through a fourth valve.
The condenser is characterized by further comprising a condensate pump, and a heat release side outlet of the condenser is communicated with an inlet of the condensate pump.
The invention has the following beneficial effects:
when the RO seawater desalination device inlet seawater heating system based on thermal power unit waste heat recovery is in specific operation, when the environmental temperature is low, high-temperature water output by a unit closed cooler is used as a heating source, low-temperature seawater in the heat absorption side of a plate type water-water heat exchanger is subjected to heat exchange and temperature rise through the high-temperature water output by a closed cooling water input pipeline, and the temperature of the seawater entering the RO seawater desalination device is increased to 25 ℃; when the environmental temperature is lower, high-temperature water output by a closed cooler of the unit does not need to be introduced, and a water source in the heat release side of the plate-type water-water heat exchanger is switched to the original circulating cooling water, so that the waste heat of the thermal power unit is recovered, the RO seawater desalination cost is reduced, and the RO seawater desalination efficiency is improved.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is a condenser, 2 is a condensate pump, 3 is a circulating water pump, 4 is a sea water pump, 5 is a plate-type water-water heat exchanger, and 6 is an RO sea water desalination device.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the inlet seawater heating system of the RO seawater desalination plant based on waste heat recovery of the thermal power generating unit according to the present invention includes a condenser 1, a circulating cooling water pipeline, a circulating water feed pipeline, a seawater pump 4, a low-temperature seawater pipeline, a plate-type water-water heat exchanger 5, an RO seawater desalination plant 6, a closed cooling water input pipeline, and a closed cooling water output pipeline; the steam exhaust port of the low-pressure cylinder in the thermal power unit is communicated with the heat release side inlet of the condenser 1, the outlet of the circulating cooling water pipeline is divided into two paths, one path of the outlet is communicated with the heat absorption side inlet of the condenser 1, the heat absorption side outlet of the condenser 1 is communicated with the circulating water feed pipeline, the other path of the outlet is communicated with the outlet of the seawater pump 4, the low-temperature seawater pipeline is communicated with the inlet of the seawater pump 4, the outlet of the seawater pump 4 is communicated with the heat absorption side inlet of the plate-type water-water heat exchanger 5, the heat absorption side outlet of the plate-type water-water heat exchanger 5 is communicated with the inlet of the RO seawater desalination device 6 and the heat absorption side inlet of the condenser 1, and the closed cooling water input pipeline is communicated with the heat.
The outlet of the circulating cooling water pipeline is divided into two paths after passing through a first valve and a circulating water pump 3; an outlet at the heat absorption side of the condenser 1 is communicated with a circulating water feed pipeline through a second valve; the circulating cooling water pipeline is communicated with an outlet of the sea water pump 4 through a third valve; the low-temperature seawater pipeline is communicated with the inlet of the seawater pump 4 through a fourth valve.
The invention also comprises a condensate pump 2, and the outlet of the heat release side of the condenser 1 is communicated with the inlet of the condensate pump 2.
In winter, a large amount of steam is extracted from a thermal power generating unit, seawater is heated through a plate-type water-water heat exchanger 5, and the temperature of the seawater is ensured to reach the optimal working temperature of 25 ℃ of an RO membrane; for the thermal power generating unit, the total heating heat comes from the low-grade waste heat of the unit, the operation safety and the operation cost of the unit are not influenced, and only the plate type water-water heat exchanger 5 which is arranged in series is needed to be added when the unit is transformed.
When the closed-type cooling water low-grade waste heat recovery device is used specifically, the closed-type cooling water low-grade waste heat is preferentially used for heating seawater, when the seawater desalination scale is small and the heat required for heating seawater is small, the redundant part of waste heat is subjected to heat exchange by circulating cooling water, namely, the quantity of the circulating cooling water entering the plate-type water-water heat exchanger 5 is adjusted by adjusting the opening degree of a third valve; when the scale of seawater desalination is large, the inlet seawater amount is controlled according to the closed cooling water heat load, the outlet seawater temperature is ensured to reach 25 ℃, and the rest low-temperature seawater entering the desalination system can be heated by other modes such as steam extraction heating and the like.
Example one
Taking a certain 330MW unit in the Bohai region as an example, inlet seawater preheating (which can meet the requirement of heating from 0 ℃ to 25 ℃) can be provided for a production line with water production scale of at least 6912t/d in winter. The calculation results are shown in table 1.
TABLE 1
| Serial number | Item | Unit of | Index (I) |
| 1 | Scale of seawater desalination | t/d | 15000 |
| 2 | Average hourly water production | t/h | 625 |
| 3 | Closed cold water volume of single unit | t/h | 1200 |
| 4 | Average inlet water temperature | ℃ | 30 |
| 5 | Average water outlet temperature | ℃ | 36 |
| 6 | Recovering waste heat | MW | 8.24 |
| 7 | Reduced amount of seawater heated in cold weather | t/h | 288 |
| 8 | Actual operating costs without seawater heating | Element/t | 5.77 |
| 9 | Unit desalination cost including seawater heating | Element/t | 4.73 |
| 10 | Annual benefit increase | Wan Yuan | 262 |
| 11 | Investment of transformation | Wan Yuan | 100 |
| 12 | Period of investment recovery | Year of year | 0.38 |
The results of the above calculations are combined to summarize the effects achievable by the present invention as follows:
1) the invention can obviously improve the water yield of the RO seawater desalination system in winter, greatly reduce the seawater desalination cost, can provide inlet seawater preheating for the production line with the water yield scale of at least 6912t/d in winter (can meet the requirement of heating from 0 ℃ to 25 ℃), can reduce the actual desalination cost of the RO seawater desalination production line in the scale from 5.77 yuan/t to 4.73 yuan/t, and can increase the seawater desalination benefit by 262 ten thousand yuan per year.
2) The invention can recover a large amount of waste heat of the closed cooling water system of the unit. Taking a single 330MW unit as an example, when the system is put into operation, the waste heat can be recovered to 8.24 MW.
3) The system is simple, the investment recovery period is short, the investment risk is small, the low-grade waste heat of the closed cooling water is fully realized, only 1 water-water heat exchanger, a corresponding pipeline and a corresponding valve are needed to be added, the waste heat of the closed cooling water of a single 330MW unit is recycled, the total construction cost does not exceed 100 ten thousand yuan, and the investment recovery period is within 1 winter.
4) The invention has high popularization value and large space, and a large amount of low-grade waste heat is not effectively utilized in large thermal power generating units in China at present.
Claims (6)
1. An RO seawater desalination device inlet seawater heating system based on waste heat recovery of a thermal power generating unit is characterized by comprising a condenser (1), a circulating cooling water pipeline, a circulating water feeding pipeline, a seawater pump (4), a low-temperature seawater pipeline, a plate-type water-water heat exchanger (5), an RO seawater desalination device (6), a closed cooling water input pipeline and a closed cooling water output pipeline;
the steam exhaust port of the low-pressure cylinder in the thermal power unit is communicated with the heat release side inlet of the condenser (1), the outlet of the circulating cooling water pipeline is divided into two paths, one path of the outlet is communicated with the heat absorption side inlet of the condenser (1), the heat absorption side outlet of the condenser (1) is communicated with the circulating water feed pipeline, the other path of the outlet is communicated with the outlet of the seawater pump (4), the low-temperature seawater pipeline is communicated with the inlet of the seawater pump (4), the outlet of the seawater pump (4) is communicated with the heat absorption side inlet of the plate-type water-water heat exchanger (5), the heat absorption side outlet of the plate-type water-water heat exchanger (5) is communicated with the inlet of the RO seawater desalination device (6) and the heat absorption side inlet of the condenser (1), and the heat release side of the closed cooling water input pipeline and the plate-type water-water.
2. The RO seawater desalination device inlet seawater heating system based on waste heat recovery of a thermal power generating unit according to claim 1, characterized in that the outlet of the circulating cooling water pipeline is divided into two paths after passing through the first valve and the circulating water pump (3).
3. The RO seawater desalination device inlet seawater heating system based on waste heat recovery of a thermal power generating unit according to claim 2, characterized in that the outlet of the heat absorption side of the condenser (1) is communicated with a circulating water feed pipe through a second valve.
4. An RO seawater desalination plant inlet seawater heating system based on waste heat recovery of thermal power generating unit according to claim 3, characterized in that the recirculated cooling water pipeline is communicated with the outlet of the seawater pump (4) through a third valve.
5. An RO seawater desalination plant inlet seawater heating system based on waste heat recovery of a thermal power generating unit as claimed in claim 4, characterized in that the low-temperature seawater pipeline is communicated with the inlet of the seawater pump (4) through a fourth valve.
6. The RO seawater desalination device inlet seawater heating system based on waste heat recovery of the thermal power generating unit according to claim 1, further comprising a condensate pump (2), wherein the outlet of the heat release side of the condenser (1) is communicated with the inlet of the condensate pump (2).
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| CN202011312110.3A CN112441690A (en) | 2020-11-20 | 2020-11-20 | RO seawater desalination device inlet seawater heating system based on waste heat recovery of thermal power generating unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112978860A (en) * | 2021-04-20 | 2021-06-18 | 西安西热节能技术有限公司 | RO seawater desalination device inlet seawater heating system utilizing flue gas waste heat recovery |
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| CN105895179A (en) * | 2016-04-13 | 2016-08-24 | 中国核电工程有限公司 | Method of using nuclear power plant cooling tower waste heat to heat sea light raw water and reduce warm water discharge |
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| CN111517393A (en) * | 2020-04-02 | 2020-08-11 | 郑州电力高等专科学校 | Method for reducing temperature discharge of seawater cooling power plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112978860A (en) * | 2021-04-20 | 2021-06-18 | 西安西热节能技术有限公司 | RO seawater desalination device inlet seawater heating system utilizing flue gas waste heat recovery |
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Application publication date: 20210305 |