CN214840954U - System for recovering waste heat in seawater desalination process and using waste heat for heat source of boiler air heater - Google Patents
System for recovering waste heat in seawater desalination process and using waste heat for heat source of boiler air heater Download PDFInfo
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- CN214840954U CN214840954U CN202120976646.9U CN202120976646U CN214840954U CN 214840954 U CN214840954 U CN 214840954U CN 202120976646 U CN202120976646 U CN 202120976646U CN 214840954 U CN214840954 U CN 214840954U
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- air heater
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- waste heat
- heat source
- boiler
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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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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The utility model discloses a system for retrieve waste heat and be used for boiler fan heater heat source in sea water desalination process, the utility model discloses an increase low temperature fan heater, effectively retrieved the waste heat energy of the concentrated seawater that low temperature multiple-effect distillation sea water desalination process produced, also reduced "thermal pollution" to the ocean. Meanwhile, cold air at the outlet of the fan is heated twice by the low-temperature air heater and the high-temperature air heater, so that the air temperature at the inlet of the boiler is further improved, and the efficiency of the boiler is further improved.
Description
Technical Field
The utility model belongs to sea water desalination waste heat utilization, concretely relates to system for retrieving waste heat and being used for boiler fan heater heat source among sea water desalination.
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 concentrated seawater temperature can reach 37-42 ℃ under the working condition of summer operation in the thermal power generating unit coupled low-temperature multi-effect distillation seawater desalination process, and the concentrated seawater is directly discharged into the sea, so that not only is all waste heat energy lost, but also the heat pollution of the sea is caused.
Disclosure of Invention
An object of the utility model is to overcome above-mentioned not enough, provide a system that retrieves waste heat and be used for boiler fan heater heat source in the sea water desalination technology, can effectively retrieve the waste heat energy of dense sea water in the low temperature multiple-effect distillation sea water desalination technology, reduce "thermal pollution" to the ocean, can further improve the wind temperature that gets into the boiler simultaneously, and then improve boiler efficiency.
In order to achieve the purpose, the utility model comprises a low-temperature air heater, a high-temperature air heater and an air preheater, wherein the low-temperature air heater is connected with the high-temperature air heater, the high-temperature air heater is connected with the air preheater, and the air preheater is connected with a boiler;
the low-temperature air heater is connected with cold air at the outlet of the fan, the heat source side of the low-temperature air heater is concentrated seawater, and the heat source side of the high-temperature fan heater is connected with steam.
And the hydrophobic on the heat source side of the low-temperature air heater is discharged into the sea.
The steam of the high-temperature fan heater is the steam led out by the unit.
And draining the drain on the heat source side of the high-temperature fan heater into a condenser.
The low-temperature air heater discharges hot air which is heated for the first time and then enters the high-temperature air heater.
The high-temperature warm air blower discharges hot air after secondary heating and enters the air preheater.
Compared with the prior art, the utility model discloses an increase low temperature fan heater, effectively retrieved the waste heat energy of the concentrated seawater that low temperature multiple-effect distillation sea water desalination process produced, also reduced "thermal pollution" to the ocean. Meanwhile, cold air at the outlet of the fan is heated twice by the low-temperature air heater and the high-temperature air heater, so that the air temperature at the inlet of the boiler is further improved, and the efficiency of the boiler is further improved.
Drawings
FIG. 1 is a system configuration diagram of the present invention;
wherein, 1, low temperature air heater, 2, high temperature air heater, 3, air heater, 4, condenser.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
Referring to fig. 1, the utility model comprises a low temperature air heater 1, a high temperature air heater 2 and an air preheater 3, wherein the low temperature air heater 1 is connected with the high temperature air heater 2, the high temperature air heater 2 is connected with the air preheater 3, and the air preheater 3 is connected with a boiler; the low-temperature air heater 1 discharges hot air which is heated for the first time and then enters the high-temperature warm air blower 2. The high-temperature warm air blower 2 discharges hot air after secondary heating and enters the air preheater 3.
The low-temperature air heater 1 is connected with cold air at the outlet of the fan, concentrated seawater is arranged on the heat source side of the low-temperature air heater 1, drain water on the heat source side of the low-temperature air heater 1 is discharged into the sea, steam is connected on the heat source side of the high-temperature air heater 2, the steam is steam led out by the unit, and the drain water on the heat source side of the high-temperature air heater 2 is discharged into the condenser 4.
The utility model discloses an operating method, including following step:
and cold air at the outlet of the fan sequentially passes through the low-temperature air heater 1, the high-temperature air heater 2 and the air preheater 3 and enters the boiler.
The heat source of the low-temperature air heater 1 is concentrated seawater, and the heat source of the high-temperature air heater 2 is steam led out from the unit.
The concentrated seawater is discharged into the sea after being cooled by the low-temperature air heater 1, and the waste heat energy of the concentrated seawater is utilized, so that the thermal pollution to the sea is reduced. Meanwhile, cold air at the outlet of the fan is heated twice, so that the temperature of the air entering the boiler is increased, and the efficiency of the boiler is further improved.
Claims (6)
1. A system for recovering waste heat in a seawater desalination process and using the waste heat as a heat source of a boiler air heater is characterized by comprising a low-temperature air heater (1), a high-temperature air heater (2) and an air preheater (3), wherein the low-temperature air heater (1) is connected with the high-temperature air heater (2), the high-temperature air heater (2) is connected with the air preheater (3), and the air preheater (3) is connected with a boiler;
the low-temperature air heater (1) is connected with cold air at the outlet of the fan, the heat source side of the low-temperature air heater (1) is concentrated seawater, and the heat source side of the high-temperature air heater (2) is connected with steam.
2. The system for recovering the waste heat for the heat source of the boiler air heater in the seawater desalination process as claimed in claim 1, wherein the drain on the heat source side of the low-temperature air heater (1) is discharged into the sea.
3. The system for recovering the waste heat for the heat source of the boiler air heater in the seawater desalination process as claimed in claim 1, wherein the steam of the high-temperature air heater (2) is the steam led out by the unit.
4. The system for recovering the waste heat for the heat source of the boiler air heater in the seawater desalination process as claimed in claim 1, wherein the drain on the heat source side of the high-temperature air heater (2) is discharged into the condenser (4).
5. The system for recovering the waste heat for the heat source of the boiler air heater in the seawater desalination process as claimed in claim 1, wherein the low-temperature air heater (1) discharges hot air after primary heating into the high-temperature air heater (2).
6. The system for recovering the waste heat for the heat source of the boiler air heater in the seawater desalination process as claimed in claim 1, wherein the high temperature air heater (2) discharges the hot air after the secondary heating into the air preheater (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120976646.9U CN214840954U (en) | 2021-05-08 | 2021-05-08 | System for recovering waste heat in seawater desalination process and using waste heat for heat source of boiler air heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120976646.9U CN214840954U (en) | 2021-05-08 | 2021-05-08 | System for recovering waste heat in seawater desalination process and using waste heat for heat source of boiler air heater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214840954U true CN214840954U (en) | 2021-11-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120976646.9U Active CN214840954U (en) | 2021-05-08 | 2021-05-08 | System for recovering waste heat in seawater desalination process and using waste heat for heat source of boiler air heater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214840954U (en) |
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2021
- 2021-05-08 CN CN202120976646.9U patent/CN214840954U/en active Active
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