CN219149249U - System for treating fly ash washing water salt crystallization mother liquor - Google Patents
System for treating fly ash washing water salt crystallization mother liquor Download PDFInfo
- Publication number
- CN219149249U CN219149249U CN202320220104.8U CN202320220104U CN219149249U CN 219149249 U CN219149249 U CN 219149249U CN 202320220104 U CN202320220104 U CN 202320220104U CN 219149249 U CN219149249 U CN 219149249U
- Authority
- CN
- China
- Prior art keywords
- mother liquor
- air
- gas
- liquid
- communicated
- Prior art date
- 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.)
- Active
Links
Images
Landscapes
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The utility model discloses a system for treating a crystallization mother solution of a fly ash washing water and salt, which comprises a crystallization mother solution collecting tank, a venturi atomizer, a gas-liquid mixing drying box, a silk screen foam remover, a sediment unit, a heat exchanger, an evaporator, a condenser, a centrifugal fan, a compressor and a refrigerant.
Description
Technical Field
The utility model relates to the technical field of cement kilns, in particular to a low-temperature evaporation treatment system for a fly ash washing water-salt crystallization mother solution.
Background
Fly ash generated by waste incineration contains a large amount of toxic substances and salt, and the current economic and effective recycling treatment mode adopts a water washing desalination and cement kiln coordinated treatment technology. For sodium chloride and potassium chloride which are rich in the fly ash desalination washing water, MVR evaporation technology is often adopted for further salt separation crystallization concentration, and part of mother liquor is required to be discharged periodically in order to ensure continuous and stable operation and economic consideration of an evaporation unit.
The mother liquor discharged from the salt separating crystallization system has the characteristics of high hardness Yi Jiegou, high viscosity, easy wall hanging and the like, and the conventional means at present adopts dividing wall heat exchange, such as a wiped film evaporator and the like, and needs matched heating steam, so that the equipment has high investment cost, small treatment capacity, high energy consumption, high operation and maintenance cost and cannot avoid secondary pollution.
Therefore, how to effectively treat the above-mentioned fly ash washing water-soluble salt crystallization mother liquor at low cost is a problem to be solved in this field.
Disclosure of Invention
Aiming at the defects in the prior art, the utility model provides a system for treating the mother liquor of the crystallization of the water-splitting salt of the fly ash, which adopts a totally-enclosed design, realizes complete solidification of the mother liquor by using 70-90 ℃ of drying circulating air, realizes maximum utilization of resources by using a special heat recovery system, avoids secondary pollution to the external environment of the system, and realizes the purpose of full quantification treatment in the crystallization process of the water-splitting salt of the fly ash.
In order to solve the problems, the utility model adopts the following scheme: the system is characterized by comprising a crystallization mother liquor collecting tank, a venturi atomizer, a gas-liquid mixing drying box, a silk screen foam remover, a sediment unit, a heat exchanger, an evaporator, a condenser, a centrifugal fan and a compressor;
the crystallization mother liquor collecting tank is used for collecting and storing mother liquor discharged from the evaporation system, and a liquid outlet of the crystallization mother liquor collecting tank is communicated with a liquid inlet end of the Venturi atomizer;
the venturi atomizer is used for atomizing mother liquor, and the outlet of the venturi atomizer is communicated with an inlet pipeline of the gas-liquid mixing drying box;
the gas-liquid mixing drying box is used for further evaporating the atomized mother liquor to form wet solid slag and saturated wet air, a slag discharging port is arranged at the bottom of the gas-liquid mixing drying box and communicated with the slag depositing unit, the wet solid slag enters the slag depositing unit, and an air outlet is arranged at the upper part of the gas-liquid mixing drying box and communicated with an inlet pipeline of the silk screen foam remover;
the silk screen foam remover is used for filtering foam and fog drops carried in saturated wet air, and an air outlet of the silk screen foam remover is communicated with an air inlet pipeline of the evaporator;
the evaporator is used for separating air and moisture in saturated wet air and outputting dry air and condensed water, wherein the dry air is communicated with an air inlet pipeline of the condenser through an air outlet, and the condensed water is discharged through a condensed water discharge pipe;
the condenser is used for heating the dry air and sending the heated dry air into the Venturi atomizer through the centrifugal fan; the compressor is communicated with the refrigerant inlet of the condenser to provide high-pressure high-temperature refrigerant for the condenser; the condensed gas refrigerant outlet is communicated with the refrigerant inlet of the evaporator to provide high-pressure low-temperature refrigerant for the evaporator; the evaporator refrigerant outlet is communicated with the compressor inlet.
Further, the fly ash washing water salt crystallization mother liquor treatment system is characterized in that the gas-liquid mixing drying box comprises a gas spoiler, a feed liquid forced circulation spray device and a liquid collecting well, wherein the circulating feed liquid in the drying box is collected in the liquid collecting well and enters the drying box again through the feed liquid forced circulation spray device for circulation spraying.
Further, the fly ash washing water salt separating crystallization mother liquor treatment system is characterized in that a centrifugal dehydrator or a plate-and-frame filter press is arranged in the sediment unit, wet solid sediment is separated into solid and liquid, the liquid is communicated with a crystallization mother liquor collecting tank through a pipeline, and the solid is transported and disposed.
Further, the system for treating the crystallization mother liquor of the water-separated salt of the fly ash is characterized in that a flushing pipeline is arranged on the pipelines of the gas-liquid mixing drying box, the silk screen foam remover and the sediment unit, and the flushing pipeline is connected to the crystallization mother liquor collecting tank.
Further, the fly ash washing water salt separating crystallization mother liquor treatment system is characterized in that a heat exchanger is arranged between the silk screen foam remover and the evaporator, an air outlet of the silk screen foam remover is communicated with an air inlet pipeline of the heat exchanger, redundant energy of the system is dissipated to the outside of the system through the heat exchanger, and an air outlet of the heat exchanger is communicated with an air inlet pipeline of the evaporator.
The system operation comprises the following steps:
s1: the mother liquor discharged from the evaporation system is sent to a crystallization mother liquor collecting tank, and the mother liquor and the dry hot air are fully mixed at the inlet of a Venturi atomizer and then enter a gas-liquid mixing drying box, so that the mother liquor is further evaporated to form wet solid slag and wet hot air;
s2: the gas-liquid mixture generated in the step S1 is sent into a gas-liquid mixing and drying box, the separation of saturated wet air and wet solid slag is realized through the gas-liquid mixing and drying box, and the wet solid slag enters a slag settling unit;
s3: filtering the saturated wet air generated in the step S2 by a silk screen demister, and then enabling the saturated wet air to enter a heat exchanger and an evaporator to realize separation of air and moisture in the wet and hot air;
s4: the dry air generated in the step S3 is sent into a condenser, and after the temperature of the dry air is increased, the dry air is sent into a Venturi atomizer through a centrifugal fan;
s5: the liquid phase generated by the sediment unit in the step S2 is sent into a crystallization mother liquor collecting tank again, and the separated residues are discharged;
s6: and (3) discharging the evaporated condensate water generated in the step S3.
After passing through the evaporator, the hot and humid air generated in the step S2 is cooled, water vapor condenses into water drops to be discharged from the air, the refrigerant medium recovers heat energy to realize evaporation in the dehumidification process of the hot and humid air, and redundant energy of the system is dissipated to the outside of the system through the heat exchanger, so that the continuous and stable operation of the compressor is ensured; the refrigerant which is converted into steam after being evaporated is compressed by a compressor and is converted into a high-temperature refrigerant; the drying air cooled by the evaporator is converted into drying air with higher temperature after heat exchange by a high-temperature refrigerant in the condenser, so that the energy recycling is realized; the heat exchanger comprises, but is not limited to, a surface cooler, an air-cooled condenser and other devices; the refrigerant medium is a refrigerant such as R134a, R142b and the like.
Condenser specific function: the dry and cold air generated in the step S3 can recover condensation latent heat and energy input by the system in the condenser, so that the temperature is increased, the dry and cold air is converted into dry and hot air for recycling, and the energy efficiency of the system is improved.
The sediment unit is a centrifugal dehydrator or a plate-and-frame filter press, and the like, the wet solid sediment generated in the step S2 is separated into solid and liquid, the liquid is returned to the mother liquor evaporation system for treatment, and the solid is transported and treated.
The mother liquor discharged from the salt separating crystallization system is a mother liquor which is difficult to continuously evaporate in a conventional salt separating crystallization system, and is characterized by containing one or more of sodium chloride, sodium sulfate and potassium chloride, wherein the Baume degree is 20-40, and the feeding temperature is 40-90 ℃.
Venturi atomizers are a series of atomizing treatment unit devices including, but not limited to, gas-liquid spray mixers, venturi ejectors, and the like. The specific processing function is as follows: and the mother liquor discharged from the salt separating crystallization system is rapidly stirred and mixed with the dry hot air and then sprayed out together, so that the gas-liquid efficient mixing is realized. The temperature range of the dry hot air adopted by the Venturi atomizer is 70-90 ℃.
The gas-liquid mixing drying box treatment unit device structurally comprises a gas-liquid mixture inlet, a wet solid slag outlet and a saturated wet air outlet. The temperature of the saturated wet air outlet of the gas-liquid mixing drying box treatment unit equipment is 35-50 ℃, and more preferably 38-43 ℃.
The silk screen foam remover is woven by adopting metal with the diameter of phi of 0.05-phi of 0.15 and is used for removing foam and fog drops carried by hot and humid air to obtain pure hot and humid air; particles and liquid drops entrained in the solid and liquid enter the bottom of the gas-liquid mixing drying box by adopting a high-speed rotational flow effect in the gas-liquid mixing drying box.
The utility model has the following technical effects: the air in the mother liquor low-temperature evaporation treatment system is recycled, the operation process is not exchanged with the outside air, and the full recycling of heat energy is realized.
The technical result of the utility model is as follows: the utility model provides a method and a system for treating a fly ash washing water-based salt-separating crystallization mother solution based on the existing fly ash washing water MVR salt-separating crystallization evaporation treatment process, which are used for directly exchanging heat with dry hot air and mother solution for evaporation, so that the problem that a conventional evaporation system cannot normally operate due to high impurity content in the mother solution in the conventional dividing wall type evaporation process is solved; the utility model adopts an energy recovery device (an evaporator, a condenser and a compressor) to collect condensed water, recover vaporization latent heat and reheat dry air, thereby greatly reducing the energy consumption of mother liquor treatment; the utility model directly adopts electric energy to provide heat, can realize modularized and standardized construction of mother liquor low-temperature evaporation treatment, and is not limited by site environment.
Drawings
FIG. 1 is a flow chart of a system process unit.
Fig. 2 is a flow diagram of an energy recovery unit.
FIG. 3 is a schematic diagram of the structure of the gas-liquid mixing drying oven.
Description of the embodiments
The utility model is described in further detail below with reference to the accompanying drawings.
Examples
By adopting the method to treat a certain fly ash water-washing salt crystallization mother liquor, TDS=310000-40000 mg/L, baume degree is 33, and the waste water is crystallization mother liquor at 80 ℃. The dry air passing through the atomization treatment unit is 75 ℃, mother liquor and dry hot air are mixed in a Venturi gas-liquid mixer and then enter a gas-liquid mixing drying box, saturated wet air with the temperature of 40-43 ℃ is formed, the saturated wet air is subjected to removal of entrained foam through a wire mesh demister, then enters a heat exchanger to remove part of heat energy, enters an evaporator to realize separation of water vapor and the dry air, the water vapor is condensed into condensed water with the temperature of 30-32 ℃, and the dry air is heated by a condenser and then enters the atomization treatment unit again at the temperature of 75 ℃; the thick solid is deposited at the bottom of the gas-liquid mixing drying box, and enters a landfill site again for landfill treatment after being solidified with lime; the water outlet of the evaporated condensate water generated by the dehumidifying heat pump reaches the surface 2 standard in the pollution control standard of a buried field (GB 16889-2008).
Examples
By adopting the method to treat the mother liquor of an industrial wastewater evaporation system, TDS 350000-430000 mg/L, baume degree of 35, and the temperature of the mother liquor discharged from the inside and outside of the evaporator is 90 ℃; the temperature of the dry air entering the Venturi ejector is 80 ℃, and the dry air and the mother liquor are fully mixed in a gas-liquid mixing drying box to form saturated wet air with the temperature of 42-44 ℃; preliminary separation of gas, liquid and solid is realized by utilizing a gas-liquid mixing drying box and a silk screen demister, and saturated wet air at 42-44 ℃ passes through a heat exchanger and an evaporator to generate condensed water and dry air at 29-33 ℃; the dry air is heated to 80 ℃ through a condenser, and then enters a venturi ejector again to be mixed with mother liquor; the liquid-solid mixture at 42-44 ℃ formed by the gas-liquid mixing drying box and the silk screen foam remover is conveyed to a centrifugal dehydrator, liquid and solid are separated, the liquid enters an evaporation system again, and the solid is transported outwards for treatment; the condensed water of the system meets the requirement of the secondary standard in the table 2 of the integrated wastewater discharge Standard (GB 8978-1996).
Claims (5)
1. The system is characterized by comprising a crystallization mother liquor collecting tank, a venturi atomizer, a gas-liquid mixing drying box, a silk screen foam remover, a sediment unit, a heat exchanger, an evaporator, a condenser, a centrifugal fan and a compressor;
the crystallization mother liquor collecting tank is used for collecting and storing mother liquor discharged from the evaporation system, and a liquid outlet of the crystallization mother liquor collecting tank is communicated with a liquid inlet end of the Venturi atomizer;
the venturi atomizer is used for atomizing mother liquor, and the outlet of the venturi atomizer is communicated with an inlet pipeline of the gas-liquid mixing drying box;
the gas-liquid mixing drying box is used for further evaporating the atomized mother liquor to form wet solid slag and saturated wet air, a slag discharging port is arranged at the bottom of the gas-liquid mixing drying box and communicated with the slag depositing unit, the wet solid slag enters the slag depositing unit, and an air outlet is arranged at the upper part of the gas-liquid mixing drying box and communicated with an inlet pipeline of the silk screen foam remover;
the silk screen foam remover is used for filtering foam and fog drops carried in saturated wet air, and an air outlet of the silk screen foam remover is communicated with an air inlet pipeline of the evaporator;
the evaporator is used for separating air and moisture in saturated wet air and outputting dry air and condensed water, wherein the dry air is communicated with an air inlet pipeline of the condenser through an air outlet, and the condensed water is discharged through a condensed water discharge pipe;
the condenser is used for heating the dry air and sending the heated dry air into the Venturi atomizer through the centrifugal fan; the compressor is communicated with the refrigerant inlet of the condenser to provide high-pressure high-temperature refrigerant for the condenser; the condensed gas refrigerant outlet is communicated with the refrigerant inlet of the evaporator to provide high-pressure low-temperature refrigerant for the evaporator; the evaporator refrigerant outlet is communicated with the compressor inlet.
2. The system for treating the fly ash water-washing salt crystallization mother liquor according to claim 1, wherein a gas spoiler, a feed liquid forced circulation spray device and a liquid collecting well are arranged in the gas-liquid mixing drying box, wherein the feed liquid sprayed in the gas-liquid mixing drying box is collected in the liquid collecting well in a circulating way, and the feed liquid enters the gas-liquid mixing drying box again through the feed liquid forced circulation spray device for circulating spraying.
3. The system for treating the mother liquor of the crystallization of the water-washed salt of the fly ash according to claim 1, wherein a centrifugal dehydrator or a plate-and-frame filter press is arranged in the sediment unit, the wet solid sediment is separated into solid and liquid, the liquid is communicated with a mother liquor collecting tank through a pipeline, and the solid is transported and disposed.
4. The system for treating the crystallization mother liquor of the water-splitting salt in the fly ash according to claim 1, wherein a flushing pipeline is arranged on the pipeline of the gas-liquid mixing drying box, the pipeline of the silk screen foam remover and the pipeline of the sediment unit, and the flushing pipeline is connected to the crystallization mother liquor collecting tank.
5. The system for treating the crystallization mother liquor of the water-washed salt of the fly ash according to claim 1, wherein a heat exchanger is arranged between the wire mesh foam remover and the evaporator, an air outlet of the wire mesh foam remover is communicated with an air inlet pipeline of the heat exchanger, redundant energy of the system is dissipated outside the system through the heat exchanger, and an air outlet of the heat exchanger is communicated with an air inlet pipeline of the evaporator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320220104.8U CN219149249U (en) | 2023-02-15 | 2023-02-15 | System for treating fly ash washing water salt crystallization mother liquor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320220104.8U CN219149249U (en) | 2023-02-15 | 2023-02-15 | System for treating fly ash washing water salt crystallization mother liquor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219149249U true CN219149249U (en) | 2023-06-09 |
Family
ID=86640301
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320220104.8U Active CN219149249U (en) | 2023-02-15 | 2023-02-15 | System for treating fly ash washing water salt crystallization mother liquor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219149249U (en) |
-
2023
- 2023-02-15 CN CN202320220104.8U patent/CN219149249U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107792909B (en) | Concentrated solution drying system for concentrating desulfurization wastewater by utilizing flue gas waste heat | |
| CN106745435B (en) | System for realizing zero discharge of desulfurization wastewater by using flue gas waste heat | |
| CN108147608B (en) | Multi-effect evaporation crystallization system and method for treating power plant brine wastewater by using compressed air and heat pump | |
| CN107337245A (en) | A kind of spraying system that desulfurization wastewater is concentrated using fume afterheat | |
| CN107857321B (en) | Process for zero discharge treatment of wastewater of thermal power plant | |
| CN112239242B (en) | Desulfurization wastewater zero-discharge system for gradient utilization of flue gas waste heat and working method thereof | |
| CN111056584A (en) | Desulfurization wastewater zero-discharge treatment system and method | |
| CN103657122A (en) | Sextuple-effect evaporation device | |
| CN108622969A (en) | The high-salt wastewater spray evaporation brine of low-quality waste heat driving detaches full reclaimer and method | |
| CN203591603U (en) | Sextuple-effect evaporator | |
| CN116768307A (en) | Desulfurization wastewater treatment method combining multistage flash evaporation with evaporation tower | |
| CN113264564A (en) | Wastewater zero discharge system based on high-efficiency concentration and spray drying integrated treatment | |
| CN113082749A (en) | Treatment method and system for evaporation crystallization and secondary steam purification of fly ash water washing liquid | |
| CN115893559A (en) | Desulfurization wastewater zero-discharge system and desulfurization wastewater zero-discharge process | |
| CN219149249U (en) | System for treating fly ash washing water salt crystallization mother liquor | |
| CN113735209A (en) | Full-quantification landfill leachate treatment device and process | |
| CN210786877U (en) | Flue gas waste heat evaporation crystallization zero discharge system | |
| CN207918477U (en) | A kind of dope drying system concentrating desulfurization wastewater using fume afterheat | |
| CN109824107B (en) | Power plant wastewater evaporation treatment method and wastewater evaporation treatment system thereof | |
| CN218596162U (en) | High-salinity wastewater zero-discharge system with combined application of low-temperature multi-effect evaporation and drying tower | |
| CN206751452U (en) | A kind of spraying system that desulfurization wastewater is concentrated using fume afterheat | |
| CN215905885U (en) | Full-quantification landfill leachate treatment device | |
| CN212356616U (en) | Desulfurization waste water zero release processing system | |
| CN212609637U (en) | Boiler flue gas desulfurization effluent disposal system | |
| CN213294703U (en) | Fly ash desalination system containing potassium chloride salt |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |