CN107381688A - A kind of water-electricity cogeneration system of the supporting low-temperature multiple-effect seawater desalination of High Back Pressure Steam Turbine Units - Google Patents
A kind of water-electricity cogeneration system of the supporting low-temperature multiple-effect seawater desalination of High Back Pressure Steam Turbine Units Download PDFInfo
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- CN107381688A CN107381688A CN201710711609.3A CN201710711609A CN107381688A CN 107381688 A CN107381688 A CN 107381688A CN 201710711609 A CN201710711609 A CN 201710711609A CN 107381688 A CN107381688 A CN 107381688A
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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
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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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
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- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
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Abstract
The invention provides a kind of water-electricity cogeneration system of the supporting low-temperature multiple-effect seawater desalination of High Back Pressure Steam Turbine Units, including generating set, flash tank, low-temperature multi-effect evaporator and auxiliary equipment.In the system, the generating set of high back pressure operation, plant condenser cooling water temperature is higher, flash tank is delivered in plant condenser cooling water draining, low-pressure steam is produced by flashing, the some vapor drives low temperature multiple-effect distillation sea water desalting evaporator output fresh water using as the thermal source of follow-up sea water desalinating unit.By bypass that low-temperature multi-effect evaporator is short-circuit under maintenance shut-downs or accident conditions, the circulating cooling coolant-temperature gage of plant condenser is reduced to the condenser inlet temperature of setting by the failure heat exchanger in bypass using seawater as low-temperature receiver.The present invention combines thermal power plant and multi-effect distilling technology, and high-quality heat energy is used to generate electricity, and low-quality heat energy is used for desalinization water, realizes the efficient cascade utilization of energy quality, water-electricity cogeneration remarkable in economical benefits.
Description
Technical field
The present invention relates to a kind of water-electricity cogeneration system of the supporting low-temperature multiple-effect seawater desalination of High Back Pressure Steam Turbine Units, it is more to belong to low temperature
Imitate field of sea water desalting technology.
Background technology
Since the 1950s, with the aggravation of water resources crisis, desalination technology be developed rapidly and
Popularization, it has also become solve one of important channel of shortage of fresh water.
Desalinization is a kind of technology that freshwater resources are obtained using the energy, according to the difference of desalination process energy form,
Desalinization can be divided into consume multistage flash evaporation based on heat energy and the hot law technology of multi-effect distilling and to consume based on electric energy
Reverse osmosis membrane law technology.
Now, multistage flash evaporation, the ton water running cost of multi-effect distilling are generally higher, and one of the main reasons is that use is higher
The extracted steam from turbine of quality causes the actual ton water integrated cost of hot method desalinization totally higher, constrained significantly as thermal source
Engineer applied, marketing and the market competitiveness.
The content of the invention
The technical problem to be solved in the present invention is how to reduce the cost of desalinization, realizes the efficient profit of energy quality
With.
In order to solve the above-mentioned technical problem, the technical scheme is that providing a kind of High Back Pressure Steam Turbine Units supporting low-temperature multi-effect
The water-electricity cogeneration system of desalinization, it is characterised in that：Including steam boiler, steam boiler steam (vapor) outlet enters with steam-turbine
Mouth connection, steam turbine output axis connection generator, steam-turbine outlet are connected with plant condenser shell side import, power plant's condensing
Device shell exports to be connected with the discharge pump inlet of power plant condensation water, and power plant condensation water discharge pump discharge connection power plant condensation water is subsequently located
Equipment is managed, forms primary heat transport system；
Plant condenser tube side outlet connection flash tank import, flash tank liquid outlet connection circulating cooling water of power plant are pumped into
Mouthful, circulating cooling water of power plant pump discharge is connected with plant condenser tube side import, forms the circulation of plant condenser cooling water closed
System；
Flash tank steam (vapor) outlet is connected with the first effect tube side import of low-temperature multi-effect evaporator；Product unit fixed on water pump suction and low-temperature multi-effect
Evaporator end effect product water side is connected, and product exit of pump is connected with product water cooler hot fluid side-entrance；Strong brine pump enters
Mouth is connected with low-temperature multi-effect evaporator end effect strong brine side, and strong brine pump discharge is connected with seawater preheating device hot fluid side-entrance；
Former seawater water supply line connects seawater lift pump inlet, and seawater lift three branch roads of pump discharge point are cold with seawater preheating device respectively
Fluid side-entrance, product water cooler cold fluid side-entrance are connected with condenser inlet；Seawater preheating device cold fluid side outlet, production
Product water cooler cold fluid side outlet is also connected with condenser inlet, and condensator outlet is connected with material unit fixed on water pump suction, material water
Pump discharge is respectively imitated water inlet with low-temperature multi-effect evaporator and is connected, and forms low temperature multi-effect seawater desalting system.
Preferably, in addition to failure heat exchanger, the inlet and outlet of failure exchanger heat fluid side connect the electricity respectively
The outlet of factory's condenser tube side and circulating cooling water of power plant pump inlet, form bypass；The import on failure heat exchanger cold flow side and go out
Mouth connects refrigerated sea water pipeline respectively；Failure heat exchanger, plant condenser, circulating cooling water of power plant pump formation plant condenser are cold
But the closed circulation system of water pure condensate pattern.
Preferably, after the low-temperature multi-effect evaporator flashes remaining condenser cooling water and the first effect evaporation of desalinization
The circulating cooling water of power plant pump inlet is connected by pipeline after condensed water mixing, entered as the plant condenser cooling water
Water.
Preferably, during normal work, primary heat transport system is generated electricity, and flash tank flash distillation is delivered in the cooling water draining of plant condenser
Go out steam, thermal source of some vapor as low-temperature multi-effect evaporator, first into low-temperature multi-effect evaporator imitates tube side, after flash distillation
Cooling water temperature reduce after again return to plant condenser heat exchange, realize that cooling water closed recycles；
Low-temperature multi-effect evaporator end effect product water enters product water cooler, and low-temperature multi-effect evaporator end effect strong brine enters
Seawater preheating device, for pre- pyrogen seawater；Former seawater after the preheating of seawater preheating device, product water cooler and condenser by
Material water is pumped into each effect water inlet of low-temperature multi-effect evaporator, carries out low-temperature multiple-effect seawater desalination process.
Preferably, when under low temperature multi-effect seawater desalting system maintenance shut-downs or accident conditions, the cooling of plant condenser
Water still recycles, and by bypass that low temperature multi-effect seawater desalting system is short-circuit, the failure heat exchanger in bypass is made with seawater
For low-temperature receiver, the circulating cooling coolant-temperature gage of plant condenser is reduced to the condenser inlet temperature of setting.
When thermal power generation unit is according to higher exhaust steam pressure, i.e., (high back pressure is relative to conventional pure condensate machine for high back pressure design
Group discharge pressure for, it is generally within 10kPa.a, but water-electricity cogeneration design, usual exhaust steam pressure need 30kPa.a with
On) when, plant condenser cooling water temperature improves therewith, and cooling water can flash off steam by supporting flash distillation plant, makees
For multiple-effect distillation sea water desalting heat source, the cooling water temperature after flash distillation again returns to plant condenser heat exchange after reducing, real
Existing cooling water closed is recycled, and low temperature multiple-effect distillation sea water desalting device is formed new equivalent to " condenser " of generating set
Type water-electricity cogeneration pattern.The new water-electricity cogeneration pattern combines thermal power plant and multi-effect distilling technology, Gao Pin
Matter heat energy is used to generate electricity, and low-quality heat energy is used for desalinization water, realizes the efficient cascade utilization of energy quality.
Matching in view of generating set and sea water desalinating unit is run, and two kinds of moulds are there may be for generating set operation
Formula.1) high back pressure operational mode, i.e. condenser cooling water recycle, and cooling water is as hot method desalinization thermal source；2) pure condensate
Pattern, when under sea water desalinating unit maintenance shut-downs or accident conditions, condenser cooling water still recycles, but side need to be set
Road, sea water desalinating unit is short-circuit, config failure heat exchanger in bypass, using seawater as low-temperature receiver, by condenser recirculated cooling water
Temperature is reduced to condenser inlet temperature.Both of which is independent mutually, can free switching operation, will not be because of water processed and to generating electricity
Unit produces any influence.
System provided by the invention overcomes the deficiencies in the prior art, and High Back Pressure Steam Turbine Units pass through the supporting flash distillation of closed cycle water
Device designs to form new water-electricity cogeneration pattern；Thermal power plant and multi-effect distilling technology are combined, high quality heat
It can be used to generate electricity, low-quality heat energy is used for desalinization water, realizes the efficient cascade utilization of energy quality, water-electricity cogeneration economy
Remarkable benefit；By setting failure heat exchanger, it is ensured that stopped transport in low temperature multi-effect seawater desalting system in failure or normally feelings
Under condition, generating set still is able to independent operating, improves the reliability between water-electricity cogeneration system.
Brief description of the drawings
Fig. 1 is the structure of the water-electricity cogeneration system for the supporting low-temperature multiple-effect seawater desalination of High Back Pressure Steam Turbine Units that the present embodiment provides
Schematic diagram.
Embodiment
With reference to specific embodiment, the present invention is expanded on further.
Fig. 1 is the structure of the water-electricity cogeneration system for the supporting low-temperature multiple-effect seawater desalination of High Back Pressure Steam Turbine Units that the present embodiment provides
Schematic diagram, the water-electricity cogeneration system of the supporting low-temperature multiple-effect seawater desalination of described High Back Pressure Steam Turbine Units by steam boiler 1, steam turbine 2,
Generator 3, plant condenser 4, power plant condensation water emptying pump 5, circulating cooling water of power plant pump 6, flash tank 7, low-temperature multi-effect evaporation
Device 8, condenser 9, seawater lift pump 10, strong brine pump 11, product water pump 12, material water pump 13, seawater preheating device 14, product water
Cooler 15, failure heat exchanger 16 etc. form.
Steam boiler 1, steam turbine 2, plant condenser 4 and power plant condensation water emptying pump 5, which are sequentially connected, forms major loop system
System.The outlet of steam boiler 1 is connected with steam turbine 2, and steam turbine 2 drives generator 3 to be generated electricity, the steam (vapor) outlet of steam turbine 2 and electricity
The shell side import of factory's condenser 4 is connected, and the shell outlet of plant condenser 4 is connected with power plant condensation water emptying pump 5, power plant condensation water
Emptying pump 5 connects power plant condensation water subsequent processing device.
The import of the tube side outlet connection flash tank 7 of plant condenser 4, the liquid outlet connection power plant cycle of flash tank 7
The entrance of cooling water pump 6, the outlet of circulating cooling water of power plant pump 6 are connected with the tube side import of plant condenser 4, are formed power plant and are coagulated
The vapour device cooling water closed circulatory system.
In bypass, the inlet and outlet on the hot-fluid side of failure heat exchanger 16 connects the tube side outlet of plant condenser 4 respectively
With the import of circulating cooling water of power plant pump 6, failure heat exchanger 16, plant condenser 4, circulating cooling water of power plant pump 6 form power plant
The closed circulation system of condenser cooling water pure condensate pattern.
The inlet and outlet on the cold flow side of failure heat exchanger 16 connects refrigerated sea water pipeline respectively.The steam (vapor) outlet of flash tank 7
It is connected with the first effect tube side import of low-temperature multi-effect evaporator 8.The import of product water pump 12 is produced with the end effect of low-temperature multi-effect evaporator 8
Product water side is connected, and the outlet of product water pump 12 is connected with the hot fluid side-entrance of product water cooler 15.The import of strong brine pump 11
It is connected with the end effect strong brine side of low-temperature multi-effect evaporator 8, the outlet of strong brine pump 11 and the hot-fluid side of seawater preheating device 14
Import connects.Former seawater water supply line connects the import of seawater lift pump 10, three branch roads in the outlet point of seawater lift pump 10, respectively with
The cold fluid side-entrance of seawater preheating device 14, the cold fluid side-entrance of product water cooler 15 are connected with the import of condenser 9.Seawater preheating
The cold fluid side outlet of device 14, the cold fluid side outlet of product water cooler 15 are also connected with the import of condenser 9, condenser 9 outlet with
The import of material water pump 13 is connected, and the outlet of material water pump 13 is connected with each effect water inlet of low-temperature multi-effect evaporator 8.
After low-temperature multi-effect evaporator 8 flashes remaining condenser cooling water and the mixing of desalinization first evaporator condensed water
The import of circulating cooling water of power plant pump 6 is connected, is intake as the cooling water of plant condenser 4.
So that 1x225MW high back pressures run the supporting ton day low-temperature multiple-effect seawater desalination techniques of 4x1.75 ten thousand of generating set as an example,
The low pressure (LP) cylinder steam discharge parameter of steam turbine 2 is 455t/h@0.054MPa.a, and 83 DEG C, now the cooling water temperature of plant condenser 4 is 80
DEG C, condenser cooling water uses closed cycle pattern.Flash tank 7 is delivered in 80 DEG C of plant condenser cooling water draining, passes through sudden strain of a muscle
Steam and produce 65 DEG C of low-pressure steam, some vapor is using as the thermal source of follow-up low-temperature multi-effect evaporator 8, into low-temperature multi-effect
The first effect tube side of evaporator 8.Former seawater is after the preheating of seawater preheating device 14, product water cooler 15 and condenser 9 by material
Water pump 13 is transported to each evaporation effect material water inlet of low-temperature multi-effect evaporator 8, carries out low-temperature multiple-effect seawater desalination process.Flash distillation
Temperature is 65.5 DEG C after remaining condenser cooling water and the mixing of desalinization first evaporator condensed water, as plant condenser
4 cooling waters are intake.The supporting ton day low-temperature multi-effect seawater desalination device of single machine yield 1.75 ten thousand of high back pressure generating set, it is annual
Ton water power consumption is about between 1.9~2.4kWh/m3Scope, thermal source cost are ignored, and production water TDS is less than 5mg/L, embodies excellent
Water-electricity cogeneration overall economic efficiency.
It is described above, only presently preferred embodiments of the present invention, it is not any to the present invention in form and substantial limitation,
It should be pointed out that for those skilled in the art, on the premise of the inventive method is not departed from, can also make
Some improvement and supplement, these are improved and supplement also should be regarded as protection scope of the present invention.All those skilled in the art,
Without departing from the spirit and scope of the present invention, when made using disclosed above technology contents it is a little more
Dynamic, modification and the equivalent variations developed, it is the equivalent embodiment of the present invention；Meanwhile all substantial technologicals pair according to the present invention
The variation, modification and evolution for any equivalent variations that above-described embodiment is made, still fall within the scope of technical scheme
It is interior.
Claims (5)
- A kind of 1. water-electricity cogeneration system of the supporting low-temperature multiple-effect seawater desalination of High Back Pressure Steam Turbine Units, it is characterised in that：Including steam copper Stove (1), steam boiler (1) steam (vapor) outlet are connected with steam turbine (2) steam inlet, steam turbine (2) output axis connection generator (3), steam turbine (2) steam (vapor) outlet is connected with plant condenser (4) shell side import, the outlet of plant condenser (4) shell and power plant Condensate emptying pump (5) import connects, power plant condensation water emptying pump (5) outlet connection power plant condensation water subsequent processing device, shape Into primary heat transport system；Plant condenser (4) tube side outlet connection flash tank (7) import, the connection power plant cycle cooling of flash tank (7) liquid outlet Water pump (6) entrance, circulating cooling water of power plant pump (6) outlet are connected with plant condenser (4) tube side import, form plant condenser The cooling water closed circulatory system；Flash tank (7) steam (vapor) outlet is connected with the first effect tube side import of low-temperature multi-effect evaporator (8)；(12) import of product water pump with it is low Warm multi-effect evaporator (8) end effect product water side connection, product water pump (12) outlet are entered with product water cooler (15) hot-fluid side Mouth connection；(11) import of strong brine pump is connected with low-temperature multi-effect evaporator (8) end effect strong brine side, strong brine pump (11) outlet with Seawater preheating device (14) hot fluid side-entrance connects；Former seawater water supply line connects seawater lift pump (10) import, seawater lift Pump (10) outlet point three branch roads, respectively with seawater preheating device (14) cold fluid side-entrance, product water cooler (15) cold fluid Side-entrance is connected with condenser (9) import；Seawater preheating device (14) cold fluid side outlet, product water cooler (15) cold flow side Outlet is also connected with condenser (9) import, and condenser (9) outlet is connected with material water pump (13) import, and material water pump (13) goes out Respectively effect water inlet is connected mouth with low-temperature multi-effect evaporator (8), forms low temperature multi-effect seawater desalting system.
- 2. a kind of water-electricity cogeneration system of the supporting low-temperature multiple-effect seawater desalination of High Back Pressure Steam Turbine Units as claimed in claim 1, it is special Sign is：Also include failure heat exchanger (16), the inlet and outlet on failure heat exchanger (16) hot-fluid side connects the electricity respectively Factory's condenser (4) tube side exports and circulating cooling water of power plant pump (6) import, forms bypass；Failure heat exchanger (16) cold flow side Inlet and outlet connect refrigerated sea water pipeline respectively；Failure heat exchanger (16), plant condenser (4), circulating cooling water of power plant Pump (6) forms the closed circulation system of plant condenser cooling water pure condensate pattern.
- 3. a kind of water-electricity cogeneration system of the supporting low-temperature multiple-effect seawater desalination of High Back Pressure Steam Turbine Units as claimed in claim 1, it is special Sign is：The low-temperature multi-effect evaporator (8) flashes the condensation after remaining condenser cooling water and the first effect evaporation of desalinization Circulating cooling water of power plant pump (6) import is connected by pipeline after water mixing, entered as the plant condenser (4) cooling water Water.
- 4. a kind of water-electricity cogeneration system of the supporting low-temperature multiple-effect seawater desalination of High Back Pressure Steam Turbine Units as described in claim 1 or 3, its It is characterised by：During normal work, primary heat transport system is generated electricity, and flash tank (7) flash distillation is delivered in the cooling water draining of plant condenser (4) Going out steam, thermal source of some vapor as low-temperature multi-effect evaporator (8), first into low-temperature multi-effect evaporator (8) imitates tube side, Cooling water temperature after flash distillation again returns to plant condenser (4) heat exchange after reducing, realize that cooling water closed recycles；Low-temperature multi-effect evaporator (8) end effect product water enters product water cooler (15), the dense salt of low-temperature multi-effect evaporator (8) end effect Water enters seawater preheating device (14), for pre- pyrogen seawater；Former seawater is by seawater preheating device (14), product water cooler (15) Each effect water inlet of low-temperature multi-effect evaporator (8) is transported to after preheating with condenser (9) by material water pump (13), carries out low temperature Multi-effect sea water desalting process.
- 5. a kind of water-electricity cogeneration system of the supporting low-temperature multiple-effect seawater desalination of High Back Pressure Steam Turbine Units as claimed in claim 2, it is special Sign is：When under low temperature multi-effect seawater desalting system maintenance shut-downs or accident conditions, the cooling water of plant condenser (4) is still Recycle, by bypass by low temperature multi-effect seawater desalting system short circuit, failure heat exchanger (16) in bypass using seawater as Low-temperature receiver, the circulating cooling coolant-temperature gage of plant condenser (4) is reduced to the condenser inlet temperature of setting.
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| CN201710711609.3A CN107381688B (en) | 2017-08-18 | 2017-08-18 | Water and electricity cogeneration system for low-temperature multi-effect seawater desalination matched with high back pressure unit |
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Cited By (5)
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| CN111792687A (en) * | 2020-07-07 | 2020-10-20 | 西安热工研究院有限公司 | Heat supply network drainage waste heat recovery device and method for thermal power plant based on seawater desalination technology |
| CN112939124A (en) * | 2021-03-30 | 2021-06-11 | 上海核工程研究设计院有限公司 | Novel low-temperature exhaust-heat seawater desalination system and method |
| CN113120983A (en) * | 2021-04-29 | 2021-07-16 | 沈阳工业大学 | Method for finishing self-distillation purification by high-temperature water-separating waste heat of steam-injection boiler |
| 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 |
| CN114922699A (en) * | 2022-05-11 | 2022-08-19 | 首钢京唐钢铁联合有限责任公司 | Cooling system of boiler steam turbine generator unit and control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111792687A (en) * | 2020-07-07 | 2020-10-20 | 西安热工研究院有限公司 | Heat supply network drainage waste heat recovery device and method for thermal power plant based on seawater desalination technology |
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| CN114922699A (en) * | 2022-05-11 | 2022-08-19 | 首钢京唐钢铁联合有限责任公司 | Cooling system of boiler steam turbine generator unit and control method |
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| CN107381688B (en) | 2020-12-18 |
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