CN209835696U - System for utilize solar photothermal technology to handle coal fired power plant desulfurization waste water - Google Patents
System for utilize solar photothermal technology to handle coal fired power plant desulfurization waste water Download PDFInfo
- Publication number
- CN209835696U CN209835696U CN201821082990.8U CN201821082990U CN209835696U CN 209835696 U CN209835696 U CN 209835696U CN 201821082990 U CN201821082990 U CN 201821082990U CN 209835696 U CN209835696 U CN 209835696U
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- China
- Prior art keywords
- condenser
- fired power
- solar
- wastewater
- desulfurization wastewater
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000002351 wastewater Substances 0.000 title claims abstract description 62
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 46
- 230000023556 desulfurization Effects 0.000 title claims abstract description 46
- 238000005516 engineering process Methods 0.000 title claims abstract description 16
- 239000003245 coal Substances 0.000 title abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000003546 flue gas Substances 0.000 claims abstract description 11
- 238000002425 crystallisation Methods 0.000 claims abstract description 8
- 230000008025 crystallization Effects 0.000 claims abstract description 8
- 238000004065 wastewater treatment Methods 0.000 claims abstract description 6
- 150000003839 salts Chemical class 0.000 claims description 20
- 230000002572 peristaltic effect Effects 0.000 claims description 6
- 239000000779 smoke Substances 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims 1
- 239000007924 injection Substances 0.000 claims 1
- 230000008020 evaporation Effects 0.000 abstract description 12
- 238000001704 evaporation Methods 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 11
- 230000002209 hydrophobic effect Effects 0.000 abstract description 7
- 230000008023 solidification Effects 0.000 abstract description 4
- 238000007711 solidification Methods 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 abstract description 3
- 239000013078 crystal Substances 0.000 abstract description 2
- 238000003912 environmental pollution Methods 0.000 abstract description 2
- 239000002918 waste heat Substances 0.000 abstract description 2
- 239000010908 plant waste Substances 0.000 abstract 1
- 239000007921 spray Substances 0.000 abstract 1
- 238000009835 boiling Methods 0.000 description 4
- 238000000746 purification Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical class [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- Y02A20/20—Controlling water pollution; Waste water treatment
- Y02A20/208—Off-grid powered water treatment
- Y02A20/212—Solar-powered wastewater sewage treatment, e.g. spray evaporation
Landscapes
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The utility model discloses a system for utilize solar photothermal technology to handle coal fired power plant desulfurization waste water belongs to coal fired power plant desulfurization waste water treatment field. The utility model discloses contained coal fired power plant waste water dilatation and handled, flue gas waste heat utilization, solar thermal energy utilization and hydrophobic crystallization solidification. The steps of treating wastewater comprise: (1) heating the wastewater to be treated in a flue and an annular Fresnel solar condenser to a temperature required by capacity expansion and evaporation; (2) the water vapor generated by the flash evaporation of the wastewater entering the flash tank is subjected to heat exchange with the wastewater in the step (1) to be cooled and condensed into high-quality water; (3) after the hydrophobic liquid is discharged from the lower part of the flash tank, the hydrophobic liquid enters a jet concentrator to form spray for rapid flash evaporation, so that the hydrophobic crystal is solidified. The utility model discloses not only improve the thermal utilization ratio of flue gas, combined solar thermal energy utilization technique moreover, effectively reduced the cost of waste water dilatation desulfurization treatment, realized heat comprehensive utilization, hydrophobic crystallization solidification treatment has reduced environmental pollution simultaneously.
Description
Technical Field
The invention discloses a system for treating desulfurization wastewater of a coal-fired power plant by using a solar photothermal technology, belongs to the field of desulfurization wastewater treatment of the coal-fired power plant, and particularly relates to a method for heating wastewater by using solar energy and high-temperature flue gas as heat sources.
Background
The expansion evaporator is widely applied to the aspects of wastewater treatment, fresh water purification, solution concentration and the like. The solution to be treated is heated to a temperature higher than the boiling point corresponding to the pressure in the flash tank, and the heated liquid enters the flash tank and then is subjected to flash evaporation, so that the moisture in the solution is separated from the solution in a steam form, and then the steam is condensed to obtain high-quality water. The combustion of coal in coal-fired thermal power plants is easy to produce a large amount of combustion products SO2Since the desulfurization technique, especially the wet desulfurization technique (limestone/gypsum method), is widely used in thermal power plants, desulfurization waste water containing heavy metals and sulfites is generated, and if the waste water is directly discharged into river lands, the environmental pollution and the waste of water resources are caused, so that the desulfurization waste water must be strictly treated.
Disclosure of Invention
The invention aims to purify thermal power plant desulfurization wastewater by using a capacity expansion evaporator, and the water temperature at the inlet of the capacity expansion evaporator is improved by combining flue gas waste heat utilization and high-concentration solar heat utilization technologies, so that the flash evaporation efficiency is improved, more high-quality water is obtained, and the utilization rate of water resources of the thermal power plant is improved; meanwhile, the hydrophobic after expansion and evaporation is crystallized and solidified, thereby eliminating the pollution of waste water and achieving the purpose of environmental protection.
In order to achieve the above purpose, the invention provides the following technical scheme:
a system for treating desulfurization wastewater of a coal-fired power plant by using a solar photo-thermal technology mainly comprises a condenser 1, a high-temperature flue gas channel 2, a molten salt heat exchanger 3, a capacity expansion evaporator 4, a jet concentrator 5 and an annular Fresnel high-power solar condenser 6.
The method comprises the following steps:
1) heating the desulfurization wastewater: and the desulfurization wastewater sequentially flows through the condenser 1, the high-temperature flue gas channel 2 and the molten salt heat exchanger 3 to be heated to a temperature higher than the boiling point of the desulfurization wastewater. Wherein the pressure for conveying the desulfurization wastewater is 10 MPa; the boiling point temperature of the wastewater refers to the boiling point temperature of the solution under normal pressure.
2) Capacity expansion and evaporation of desulfurization wastewater: and (2) feeding the desulfurization wastewater heated in the step 1) into a 4-degree flash tank, wherein the flash evaporation of the wastewater is carried out in the flash tank because the pressure in the flash tank is normal pressure and is far less than the 10MPa pressure of the conveyed wastewater, and the generated steam amount is 3-4 t/h.
3) Steam condensation: and (3) allowing the steam generated in the step 2) to flow into the condenser (1), and taking away heat of the steam by the desulfurization wastewater flowing in the condenser, so that the steam is condensed into water, the wastewater purification is completed, and the temperature of the desulfurization wastewater is increased.
4) And (3) hydrophobic treatment: after expansion evaporation, draining water from a discharge hole at the lower part of the expansion tank 4, entering a jet concentrator 5, and performing fast flash evaporation concentration on the drained water by distributed spraying, so that impurity crystals in the drained water are solidified. In the system for treating desulfurization wastewater of a coal-fired power plant by using a solar photo-thermal technology, the condenser in the step 1) is used for condensing steam generated by the expansion evaporator. The system for treating the desulfurization wastewater of the coal-fired power plant by using the solar photo-thermal technology comprises the following steps that in step 1), the smoke temperature in the high-temperature smoke flow channel is 400 ℃ and the smoke flow rate is 1,000,000m2H is used as the reference value. In the system for treating the desulfurization wastewater of the coal-fired power plant by using the solar photothermal technology, the working medium in the molten salt heat exchanger in the step 1) is high-temperature molten salt, the solar heat is highly concentrated by the annular Fresnel solar condenser, and the molten salt is heated to the temperature of 500-600 ℃, so that the heat exchange between the molten salt and the desulfurization wastewater is realized by the molten salt heat exchanger. In the desulfurization wastewater capacity-expansion purification treatment method, the reason why the pressure for conveying the desulfurization wastewater in the step 1) is 10MPa is that when the pressure is greater than 10MPa, the pressure has little influence on the evaporation rate of the capacity-expansion evaporator, the temperature still has great influence, and the cost problem caused by pressure rise is considered, so the pressure for conveying the desulfurization wastewater is selected to be 10 MPa. In the system for treating desulfurization wastewater of a coal-fired power plant by using a solar photo-thermal technology, the inlet temperature of the desulfurization wastewater flowing in the condenser in the step 3) is 50 ℃, and the flow rate is 5 t/h. The fuel is treated by utilizing a solar photo-thermal technologyIn the used equipment of system of coal power plant's desulfurization waste water, annular Fresnel solar concentrator optical efficiency is high, and the solar energy can effectively be assembled to the concentration ratio big, consequently is little than traditional solar collector area, and the quality is light, has very big advantage in the aspect of the solar thermal energy utilization.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention.
Wherein: the method comprises the following steps of 1-a condenser, 2-a high-temperature flue gas channel, 3-a molten salt heat exchanger, 4-a flash evaporator, 5-a jet concentrator, 6-an annular Fresnel high-power solar condenser, 7-a feed pump, 8-a throttle valve, 9-a pressure gauge, 10-a peristaltic pump and 11-a crystallization tank.
Detailed Description
The attached drawings disclose a flow chart of the desulfurization wastewater treatment related to the invention in a non-limiting way, and the operation flow of the process is described in detail as follows:
firstly, desulfurization wastewater is introduced into the condenser 1 by the feed pump 7 (the pressure for conveying the desulfurization wastewater is 10MPa), and the desulfurization wastewater exchanges heat with steam generated by the expansion evaporator 4, so that the wastewater is cooled and condensed into high-quality water for recycling while the temperature of the steam is increased. Then the wastewater enters a high-temperature flue gas channel 2 (300-. The molten salt flowing through the annular Fresnel high-power solar condenser 6 in the third heat exchange process is in closed circulation, namely the molten salt is heated in the condenser 6 and then flows through the molten salt heat exchanger 3 to exchange heat with wastewater, and the cooled molten salt flows back into the condenser 6 again to be heated, so that the molten salt is recycled.
After the wastewater is subjected to three times of temperature rise treatment, the pressure intensity of the wastewater is detected by a pressure intensity meter 9, so that the safety of wastewater treatment is ensured. Before the waste water enters the flash evaporator 4, the flow of the waste water flowing into the flash tank is adjusted by the throttle valve 8, so that the normal operation of the flash tank 4 is ensured.
After the desulfurization wastewater enters the flash evaporator 4, because the temperature of the wastewater is unchanged, but the pressure of the wastewater is far higher than the normal pressure in the flash evaporator 4, the temperature of the wastewater is far higher than the solution saturation temperature corresponding to the flash pressure, the volume of the solution expands rapidly, and flash evaporation occurs. The generated steam has low density, is discharged from the upper port of the flash tank 4 and flows into the condenser 1, and the steam exchanges heat with low-temperature desulfurization wastewater (50 ℃) in the condenser 1 to reduce the temperature and condense to generate high-quality water.
The drained water at the bottom of the expansion evaporator 4 is driven by a peristaltic pump 10 to be sent into a jet concentrator 5 for crystallization and solidification treatment, and a crystallization and solidification product finally falls into a crystallization tank 11 for treatment.
Claims (6)
1. A system for treating desulfurization wastewater of a coal-fired power plant by using a solar photo-thermal technology is characterized in that the following equipment is designed in the same system for wastewater treatment, and the related equipment comprises: the system comprises a condenser (1), a high-temperature flue gas channel (2), a molten salt heat exchanger (3), a flash evaporator (4), an injection concentrator (5), an annular Fresnel solar condenser (6), a feed pump (7), a throttle valve (8), a pressure gauge (9), a peristaltic pump (10) and a crystallization tank (11); the feed pump is arranged in front of the condenser, the condenser is arranged in front of the high-temperature flue gas flow channel, the lava heat exchanger is arranged behind the high-temperature flue, the pressure gauge is arranged behind the lava heat exchanger, the throttle valve is arranged behind the pressure gauge, the expansion evaporator is arranged behind the throttle valve, the peristaltic pump is arranged at the lower end of the expansion evaporator, the jet concentrator is arranged behind the peristaltic pump, and the crystallization tank is arranged behind the jet concentrator; the feed pump, the condenser, the high-temperature flue gas channel, the molten salt heat exchanger, the pressure gauge, the throttle valve and the desulfurization waste water inlet of the expansion evaporator are sequentially connected in series; an outlet at the upper end of the steam of the expansion evaporator is connected with the condenser in series; the lower port of the expansion evaporator, the peristaltic pump and the jet concentrator are connected in series in sequence along the discharge direction of the concentrated water; and a feeding pump is arranged between the annular Fresnel solar condenser and the molten salt heat exchanger, and the annular Fresnel solar condenser, the molten salt heat exchanger and the molten salt heat exchanger are connected end to end.
2. The system for treating desulfurization wastewater of coal-fired power plants by using solar photothermal technology according to claim 1, wherein: the condenser refers to a device used for condensing steam generated by the expansion evaporator.
3. The system for treating desulfurization wastewater of coal-fired power plants by using solar photothermal technology according to claim 1, wherein: the smoke temperature in the high-temperature smoke channel is 300-2/h。
4. The system for treating desulfurization wastewater of coal-fired power plants by using solar photothermal technology according to claim 1, wherein: the working medium in the molten salt heat exchanger is high-temperature molten salt.
5. The system for treating desulfurization wastewater of coal-fired power plants by using solar photothermal technology according to claim 1, wherein: the pressure for conveying the desulfurization wastewater is 10 MPa.
6. The system for treating desulfurization wastewater of coal-fired power plants by using solar photothermal technology according to claim 1, wherein: the inlet temperature of the desulfurization wastewater flowing in the condenser is 50 ℃, and the flow rate is 5 t/h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821082990.8U CN209835696U (en) | 2018-07-10 | 2018-07-10 | System for utilize solar photothermal technology to handle coal fired power plant desulfurization waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821082990.8U CN209835696U (en) | 2018-07-10 | 2018-07-10 | System for utilize solar photothermal technology to handle coal fired power plant desulfurization waste water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209835696U true CN209835696U (en) | 2019-12-24 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821082990.8U Expired - Fee Related CN209835696U (en) | 2018-07-10 | 2018-07-10 | System for utilize solar photothermal technology to handle coal fired power plant desulfurization waste water |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209835696U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111207048A (en) * | 2019-12-30 | 2020-05-29 | 赫普能源环境科技股份有限公司 | Thermal power plant coupling photo-thermal molten salt heat collection power generation system and carbon emission reduction method |
| CN112919570A (en) * | 2021-03-30 | 2021-06-08 | 华北电力大学 | Direct evaporation type seawater desalination distiller based on annular Fresnel high-power condenser |
| CN113213683A (en) * | 2021-03-26 | 2021-08-06 | 华北电力大学 | Desulfurization wastewater treatment system based on annular Fresnel type high-power solar condenser |
-
2018
- 2018-07-10 CN CN201821082990.8U patent/CN209835696U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111207048A (en) * | 2019-12-30 | 2020-05-29 | 赫普能源环境科技股份有限公司 | Thermal power plant coupling photo-thermal molten salt heat collection power generation system and carbon emission reduction method |
| CN113213683A (en) * | 2021-03-26 | 2021-08-06 | 华北电力大学 | Desulfurization wastewater treatment system based on annular Fresnel type high-power solar condenser |
| CN112919570A (en) * | 2021-03-30 | 2021-06-08 | 华北电力大学 | Direct evaporation type seawater desalination distiller based on annular Fresnel high-power condenser |
| CN112919570B (en) * | 2021-03-30 | 2023-07-21 | 华北电力大学 | Direct evaporation type sea water desalination distiller based on annular Fresnel high-power condenser |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191224 |
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| CF01 | Termination of patent right due to non-payment of annual fee |