CN113072115A - System and method for recycling strong brine waste heat for desalting water of heating unit - Google Patents
System and method for recycling strong brine waste heat for desalting water of heating unit Download PDFInfo
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- CN113072115A CN113072115A CN202110502248.8A CN202110502248A CN113072115A CN 113072115 A CN113072115 A CN 113072115A CN 202110502248 A CN202110502248 A CN 202110502248A CN 113072115 A CN113072115 A CN 113072115A
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- water
- waste heat
- heating unit
- surface heater
- recovering
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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
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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
- C02F2303/00—Specific treatment goals
- C02F2303/10—Energy recovery
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- 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)
Abstract
The invention discloses a system and a method for recovering concentrated brine waste heat to heat unit desalted water. Strong brine waste heat recovery, but both intermittent type nature operation, also sustainable operation, strong brine heating insufficient part is complemented by follow-up backheat system, guarantees that the feedwater temperature satisfies power generation system operation demand.
Description
Technical Field
The invention belongs to the field of sea water desalination waste heat utilization, and particularly relates to a system and a method for recovering strong brine waste heat to be used for heating unit desalted water.
Background
At present, a plurality of seawater desalination processes are available, and the seawater desalination processes reaching commercial scale mainly comprise a reverse osmosis method and a distillation method, namely a membrane method and a thermal method, wherein the thermal method technology comprises two common technologies of low-temperature multi-effect distillation and multi-stage flash evaporation. The low-temperature multi-effect distillation seawater desalination technology adopts low-quality steam with the pressure of 25-35 kPa and the temperature of 65-70 ℃ to heat seawater, and the steam generated in the previous evaporator provides a heat source for the next evaporator and is gradually condensed into fresh water.
A series of horizontal pipe spraying falling film evaporators are connected in series, and power steam enters a first effect evaporator and is condensed into desalinated water after exchanging heat with feed seawater; the seawater is evaporated, the steam enters the second effect evaporator, and almost the same amount of seawater is evaporated at a lower temperature than the first effect and is condensed. This process is repeated until the final effect, producing desalinated water continuously.
The seawater is preheated and degassed in the condenser and then divided into two streams, one stream is discharged back to the sea, and the other stream is the feed liquid. Adding a scale inhibitor into the feed liquid, and respectively introducing the feed liquid into each stage of evaporator. The spraying system distributes the feed liquid on the top discharge pipe, and in the falling film process from top to bottom, a part of seawater absorbs the latent heat of condensed steam in the pipe bundle to be vaporized; the condensate is led out by desalted water, and the steam enters the next effect group. The evaporation and spraying processes are repeated in each evaporator, the seawater is discharged in each evaporator in the form of concentrated seawater, and the concentrated seawater is directly discharged into the sea.
At present, the temperature of concentrated seawater in the domestic thermal power generating unit coupled low-temperature multi-effect distillation seawater desalination process can reach 37-42 ℃ under the working condition of summer operation, and the concentrated seawater is directly discharged into the sea, so that all waste heat energy is lost, and the thermal pollution of the sea is also caused.
Disclosure of Invention
The invention aims to overcome the defects and provides a system and a method for recovering the waste heat of strong brine for heating unit desalted water.
In order to achieve the purpose, the system for recovering the waste heat of the strong brine to be used for heating the desalted water of the unit comprises a surface heater, wherein the heat source side of the surface heater is connected with the strong brine, and the outlet of the cold source side of the surface heater is connected with a condenser.
The output on the heat source side of the surface heater is discharged into the sea.
The cold source side of the surface heater is connected with desalted water.
The demineralized water adopts demineralized water for water supplement of a machine set.
The cold source side of the surface heater discharges the heated demineralized water.
And the heated desalted water is used as water supplement and is sent to a condenser.
A working method of a system for recovering waste heat of strong brine for heating unit demineralized water comprises the following steps:
s1, delivering the desalted water into a surface heater, and heating the desalted water by taking concentrated seawater generated in the low-temperature multi-effect distilled seawater desalination process as a heat source;
and S2, sending the heated desalted water into a condenser.
The concentrated seawater after heat exchange is discharged into the sea.
Compared with the prior art, the invention adds the surface heater, utilizes the heat energy of the concentrated seawater generated by the low-temperature multi-effect distillation seawater desalination process to heat the desalted water for replenishing water of the unit, so that the temperature of the condensed water at the outlet of the condensed water pump is increased, the low-pressure steam extraction quantity is squeezed, the unit generating capacity under the same main steam flow is increased, simultaneously the waste heat energy of the concentrated seawater is effectively recovered, and the thermal pollution to the ocean is reduced.
The method of the invention sends the desalted water into the surface heater, uses the concentrated seawater generated in the low-temperature multi-effect distilled seawater desalination process as a heat source to heat the desalted water, and sends the heated desalted water into the condenser.
Drawings
FIG. 1 is a block diagram of the system of the present invention;
wherein, 1, surface heater, 2, condenser.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1, a system for recovering waste heat of strong brine for heating unit demineralized water comprises a surface heater 1, wherein the heat source side of the surface heater 1 is connected with strong seawater, and the outlet of the cold source side is connected with a condenser 2. The output on the heat source side of the surface heater 1 is discharged into the sea. The cold source side of the surface heater 1 is connected with demineralized water for supplementing water to the unit. The cold source side of the surface heater 1 discharges the heated demineralized water. The heated desalted water is sent to the condenser 2 as make-up water.
The working method of the invention is characterized by comprising the following steps:
s1, delivering the desalted water into the surface heater 1, heating the desalted water by taking concentrated seawater generated in the low-temperature multi-effect distilled seawater desalination process as a heat source, and discharging the concentrated seawater subjected to heat exchange into the sea;
and S2, sending the heated desalted water into the condenser 2.
Introducing concentrated seawater generated in a low-temperature multi-effect distillation seawater desalination process into the heat source side of a surface heater 1; introducing demineralized water into the cold source side of the surface heater 1;
discharging the concentrated seawater into the sea after heat exchange and temperature reduction; the demineralized water is heated and then supplied to the condenser 2.
Strong brine waste heat recovery, but both intermittent type nature operation, also sustainable operation, strong brine heating insufficient part is complemented by follow-up backheat system, guarantees that the feedwater temperature satisfies power generation system operation demand.
Claims (8)
1. The utility model provides a system for strong brine waste heat recovery is used for heating unit demineralized water, its characterized in that includes surface heater (1), and the concentrated seawater is connected to the heat source side access of surface heater (1), cold source side exit linkage condenser (2).
2. A system for concentrated brine waste heat recovery for desalination of water in a heating plant according to claim 1, characterized in that the output on the heat source side of the surface heater (1) is discharged into the sea.
3. The system for recovering the waste heat of the concentrated brine for heating unit demineralized water as claimed in claim 1, wherein the cold source side of the surface heater (1) is connected to the demineralized water.
4. The system for recovering concentrated brine waste heat for heating unit demineralized water according to claim 3, characterized in that the demineralized water adopts demineralized water for unit water supplement.
5. The system for recovering concentrated brine waste heat for heating unit demineralized water according to claim 1, characterized in that the cold source side of the surface heater (1) discharges the heated demineralized water.
6. The system for recovering the waste heat of the concentrated brine for the desalted water of the heating unit as claimed in claim 5, wherein the heated desalted water is fed to the condenser (2) as a make-up water.
7. The operating method of the system for recovering the waste heat of the concentrated brine for the desalted water of the heating unit as claimed in claim 1, is characterized by comprising the following steps:
s1, delivering the desalted water into a surface heater (1), and heating the desalted water by taking concentrated seawater generated in the low-temperature multi-effect distilled seawater desalination process as a heat source;
and S2, feeding the heated desalted water into a condenser (2).
8. The operating method of the system for recovering the waste heat of the concentrated brine for the desalted water of the heating unit as claimed in claim 7, wherein the concentrated seawater after heat exchange is discharged into the sea.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110502248.8A CN113072115A (en) | 2021-05-08 | 2021-05-08 | System and method for recycling strong brine waste heat for desalting water of heating unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110502248.8A CN113072115A (en) | 2021-05-08 | 2021-05-08 | System and method for recycling strong brine waste heat for desalting water of heating unit |
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|---|---|
| CN113072115A true CN113072115A (en) | 2021-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110502248.8A Pending CN113072115A (en) | 2021-05-08 | 2021-05-08 | System and method for recycling strong brine waste heat for desalting water of heating unit |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58193783A (en) * | 1982-05-08 | 1983-11-11 | Mitsui Eng & Shipbuild Co Ltd | Recovery device for sea water |
| KR20020066502A (en) * | 2001-02-12 | 2002-08-19 | 박창호 | The method of seawater desalination by utilization of solar heat and it`s equipment |
| CN204438853U (en) * | 2014-12-16 | 2015-07-01 | 河南省电力勘测设计院 | A kind of aqueous vapor from power plant sampling cooling system |
| CN105293611A (en) * | 2014-07-29 | 2016-02-03 | 刘炎军 | Desalination process system utilizing waste heat |
| CN105314703A (en) * | 2015-10-15 | 2016-02-10 | 南京航空航天大学 | Heat pump seawater desalination fully-coupled circulation system and method |
| CN212076474U (en) * | 2020-04-02 | 2020-12-04 | 郑州电力高等专科学校 | System for reducing coastal power station temperature discharge by coupling seawater desalination |
-
2021
- 2021-05-08 CN CN202110502248.8A patent/CN113072115A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58193783A (en) * | 1982-05-08 | 1983-11-11 | Mitsui Eng & Shipbuild Co Ltd | Recovery device for sea water |
| KR20020066502A (en) * | 2001-02-12 | 2002-08-19 | 박창호 | The method of seawater desalination by utilization of solar heat and it`s equipment |
| CN105293611A (en) * | 2014-07-29 | 2016-02-03 | 刘炎军 | Desalination process system utilizing waste heat |
| CN204438853U (en) * | 2014-12-16 | 2015-07-01 | 河南省电力勘测设计院 | A kind of aqueous vapor from power plant sampling cooling system |
| CN105314703A (en) * | 2015-10-15 | 2016-02-10 | 南京航空航天大学 | Heat pump seawater desalination fully-coupled circulation system and method |
| CN212076474U (en) * | 2020-04-02 | 2020-12-04 | 郑州电力高等专科学校 | System for reducing coastal power station temperature discharge by coupling seawater desalination |
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