CN109607923A - A kind of heat pump low temperature divides the wastewater treatment equipment of salt - Google Patents
A kind of heat pump low temperature divides the wastewater treatment equipment of salt Download PDFInfo
- Publication number
- CN109607923A CN109607923A CN201910015558.XA CN201910015558A CN109607923A CN 109607923 A CN109607923 A CN 109607923A CN 201910015558 A CN201910015558 A CN 201910015558A CN 109607923 A CN109607923 A CN 109607923A
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- China
- Prior art keywords
- sodium
- sodium chloride
- sodium sulphate
- heating
- chamber
- Prior art date
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Links
- 150000003839 salts Chemical class 0.000 title claims abstract description 19
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 17
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 226
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims abstract description 224
- 229910052938 sodium sulfate Inorganic materials 0.000 claims abstract description 114
- 235000011152 sodium sulphate Nutrition 0.000 claims abstract description 114
- 239000011780 sodium chloride Substances 0.000 claims abstract description 113
- 238000010438 heat treatment Methods 0.000 claims abstract description 106
- 238000002425 crystallisation Methods 0.000 claims abstract description 82
- 230000008025 crystallization Effects 0.000 claims abstract description 78
- 238000001704 evaporation Methods 0.000 claims abstract description 33
- 239000002351 wastewater Substances 0.000 claims abstract description 32
- 230000008020 evaporation Effects 0.000 claims abstract description 28
- 238000001816 cooling Methods 0.000 claims abstract description 25
- 239000013078 crystal Substances 0.000 claims abstract description 24
- 239000012943 hotmelt Substances 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 46
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 36
- 239000011734 sodium Substances 0.000 claims description 36
- 229910052708 sodium Inorganic materials 0.000 claims description 36
- 238000005660 chlorination reaction Methods 0.000 claims description 18
- 239000011229 interlayer Substances 0.000 claims description 14
- 238000000926 separation method Methods 0.000 claims description 11
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 9
- 239000000460 chlorine Substances 0.000 claims description 9
- 229910052801 chlorine Inorganic materials 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 230000008014 freezing Effects 0.000 claims description 8
- 238000007710 freezing Methods 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 4
- 239000005864 Sulphur Substances 0.000 claims description 4
- 238000003672 processing method Methods 0.000 claims description 3
- 238000005119 centrifugation Methods 0.000 claims 1
- 238000000034 method Methods 0.000 description 6
- 239000010842 industrial wastewater Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- PANBYUAFMMOFOV-UHFFFAOYSA-N sodium;sulfuric acid Chemical compound [Na].OS(O)(=O)=O PANBYUAFMMOFOV-UHFFFAOYSA-N 0.000 description 3
- 238000000605 extraction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 239000002920 hazardous waste Substances 0.000 description 1
- PALNZFJYSCMLBK-UHFFFAOYSA-K magnesium;potassium;trichloride;hexahydrate Chemical compound O.O.O.O.O.O.[Mg+2].[Cl-].[Cl-].[Cl-].[K+] PALNZFJYSCMLBK-UHFFFAOYSA-K 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000012452 mother liquor Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
-
- 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
- C02F1/22—Treatment of water, waste water, or sewage by freezing
-
- 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
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
Abstract
The invention discloses the wastewater treatment equipments that a kind of heat pump low temperature divides salt, waste water is concentrated using the heat source heating evaporation of heat pump, use the cold source frozen cooling waste water of heat pump, the characteristic for being changed using sodium sulphate solubility with temperature and being changed, sodium sulphate is precipitated, and carries out the evaporative crystallization of sodium chloride, the hot melt purifying crystal of sodium sulphate using secondary steam.The present invention carries out waste water point salt treatment using the heat source and cold source for making full use of heat pump respectively, consumes energy extremely low；It is low for equipment requirements due to being low-pressure low-temperature evaporation, nonmetallic materials can be largely used, investment is less；And have the advantages that low vibration, low noise.
Description
Technical field
The present invention relates to field of waste water treatment, in particular to a kind of heat pump low temperature divides the wastewater treatment equipment of salt.
Background technique
Industrial wastewater has the characteristics that salt content height, complicated component, pollution are big, it is necessary to rationally disposition, high-salt wastewater zero
Discharge has been increasingly becoming the inevitable requirement of environmental protection, and the processing cost is high for current China's industrial wastewater, usually very by energy consumption
High evaporative crystallization technique formation is difficult to be utilized, several unworthy solid carnallite wastes, then spends thousands of outer processing of member committee, and
And domestic only a small number of hazardous waste processing centers are capable of handling these carnallites, cause processing cost high, business burden weight.
And in industrial wastewater, usually contain a large amount of sodium sulphate and sodium chloride, especially in mine tail water/coal chemical industrial waste water
In, there is the group of 85% ~ 95% to be divided into sodium chloride and sodium sulphate.Therefore, separation and Extraction sodium chloride and sodium sulphate in industrial wastewater
Crystal has great application value.
The device of separation and Extraction sodium chloride and sodium sulfate crystal at present, require when evaporation and concentration to reach one it is higher dense
Degree is both needed to long-time heating evaporation, and technique chain is longer, and investment and operating cost are high, are not suitable with the demand of enterprise, is unfavorable for big
Area promotes and applies.
Summary of the invention
Technical problem to be solved by the present invention lies in provide the wastewater treatment equipment that a kind of heat pump low temperature divides salt, investment
It is lower and more energy saving.
In order to achieve the above objectives, the invention discloses the wastewater treatment equipments that a kind of heat pump low temperature divides salt, comprising:
Heat pump, the heat pump have temperature end and low-temperature end；
Evaporation concentrator, the evaporation concentrator include the heating chamber for accommodating waste water, the heating chamber and the height
Warm end heat exchange connection；
Freezing and crystallizing device, the freezing and crystallizing device include the cooling chamber for accommodating waste water, the cooling chamber with it is described low
Warm end heat exchange connection；
Refrigerated centrifuge, the refrigerated centrifuge are connected to the cooling chamber, the solidliquid mixture for keeping the cooling intracavitary
It is separated by solid-liquid separation in into the refrigerated centrifuge；
Sodium sulphate crystallizing evaporator, the sodium sulphate crystallizing evaporator include sodium sulphate evaporative crystallization chamber and for increasing sulphur
The sodium sulphate heating device of sour sodium evaporative crystallization cavity temperature, the sodium sulphate evaporative crystallization chamber are consolidated with the refrigerated centrifuge
The connection of body discharge port, the solid for keeping the refrigerated centrifuge isolated enter the sodium sulphate evaporative crystallization chamber；
Sodium sulphate centrifuge, the sodium sulphate centrifuge are connected to the sodium sulphate evaporative crystallization chamber, make the sodium sulphate
The intracavitary solidliquid mixture of evaporative crystallization enters the sodium sulphate centrifuge and is separated by solid-liquid separation；
Sodium chloride crystallizing evaporator, the sodium chloride crystallizing evaporator include sodium chloride evaporative crystallization chamber and for increasing chlorine
Change the sodium chloride heating device of sodium evaporative crystallization cavity temperature, the liquid of the sodium chloride evaporative crystallization chamber and the refrigerated centrifuge
The connection of body discharge port, the waste water for keeping the refrigerated centrifuge isolated enter the sodium chloride evaporative crystallization chamber；
Sodium chloride centrifuge, the sodium chloride centrifuge are connected to the sodium chloride evaporative crystallization chamber, make the sodium chloride
The intracavitary solidliquid mixture of evaporative crystallization enters the sodium chloride centrifuge and is separated by solid-liquid separation.
Preferably, the liquid outlet opening of the sodium sulphate centrifuge is connected to the heating chamber, is centrifuged the sodium sulphate
The waste water that machine is isolated enters the heating chamber and is recycled again, the liquid outlet opening and the liter of the sodium chloride centrifuge
Warm chamber connection, the waste water for isolating the sodium chloride centrifuge enter the heating chamber and are recycled again.
Preferably, the temperature end and the fire end carry out heat exchange connection by First Heat Exchanger, the low-temperature end and
The freezing end carries out heat exchange connection by the second heat exchanger.
Preferably, it is connected on the pipeline of the sodium sulphate centrifuge liquid outlet opening and the heating chamber and is provided with sodium sulphate
Kettle base solution outlet is connected on the pipeline of the sodium chloride centrifuge liquid outlet opening and the heating chamber and is provided with sodium chloride kettle
Bottom liquid outlet.
Preferably, the sodium sulphate heating device is connected to the heating chamber, and the secondary steam for keeping the heating intracavitary is logical
It crosses the sodium sulphate heating device substance intracavitary to the sodium sulphate evaporative crystallization to heat, the sodium chloride heating device
It is connected to the heating chamber, the secondary steam for keeping the heating intracavitary steams the sodium chloride by the sodium chloride heating device
Substance in hair crystallization cavity is heated.
Preferably, the sodium sulphate heating device includes that the sodium sulphate of the sodium sulphate evaporative crystallization cavity outer wall is arranged in add
Hot interlayer, the sodium sulphate heating interlayer are connected to the heating chamber, and the sodium chloride heating device includes being arranged in the chlorine
Change the sodium chloride heating interlayer of sodium evaporative crystallization cavity outer wall, the sodium chloride heating interlayer is connected to the heating chamber.
The invention also discloses a kind of processing methods of wastewater treatment equipment for dividing salt according to above-mentioned heat pump low temperature, use institute
Temperature end to be stated to heat up to the heating chamber, waste water enters the cooling chamber after the intracavitary heating of heating is concentrated by evaporation,
Cooled down using the low-temperature end to the cooling chamber, waste water enter after the intracavitary decrease temperature crystalline of the cooling it is described freeze from
Scheming is centrifugally separating to obtain sal glauberi and chlorination mother liquid of sodium using the centrifuge；
Sal glauberi enters the sodium sulphate evaporative crystallization chamber from the solid outlet of the refrigerated centrifuge, uses institute
Stating sodium sulphate heating device makes the sodium sulphate evaporative crystallization chamber heat up, and the sal glauberi heating hot melt evaporative crystallization is laggard
Enter the sodium sulphate centrifuge, uses the isolated sodium sulfate crystal of the sodium sulphate centrifuge and sodium sulphate raffinate；
Chlorination mother liquid of sodium enters the sodium chloride evaporative crystallization chamber from the liquid outlet opening of the refrigerated centrifuge, uses institute
Stating sodium chloride heating device makes the sodium chloride evaporative crystallization chamber heat up, and the chlorination mother liquid of sodium heating evaporating, concentrating and crystallizing is laggard
Enter the sodium chloride centrifuge, uses the isolated sodium chloride crystal of the sodium chloride centrifuge and sodium chloride raffinate.
Compared with the prior art, the beneficial effects of the present invention are:
Heating evaporation and concentration is carried out to waste water using the heat source of heat pump, the waste water of moderate concentration is dropped using the cold source of heat pump
Temperature crystallization, reduces and reduced characteristic according to sodium sulphate solubility with temperature, sodium sulphate is precipitated from the waste water of intermediate concentration,
To obtain sal glauberi crystal, Cooling and Heat Source makes full use of respectively, and energy consumption reduces by 50% or more compared to prior art；
The mother liquor containing whole sodium chloride and part of sulfuric acid sodium is evaporated using the secondary steam of evaporation concentrator dense
Contracting, increases according to sodium sulphate solubility with temperature and raised characteristic and sodium chloride solubility are not varied with temperature and influenced
Sodium chloride concentration is precipitated in characteristic, and sodium sulphate reaches far away precipitation concentration since solubility increases, to obtain sodium chloride crystalline substance
Body does not consume energy additionally；
Temperature end, the low-temperature end of heat pump pass through heat exchanger respectively and connect with evaporation and crystallization system, heat pump not with waste water,
Run more stable, maintenance period, service life are all longer；
Evaporation process be low temperature, atmospheric evaporation, to evaporation equipment require it is low, can largely use nonmetallic materials, investment
It is smaller, and have the advantages that low noise, low vibration.
Detailed description of the invention
Fig. 1 is overall structure diagram of the embodiment of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, the present invention is made below in conjunction with the attached drawing of Fig. 1
Further it is described in detail.
Shown in referring to Fig.1, a kind of heat pump low temperature divides the wastewater treatment equipment of salt, comprising:
Heat pump 1, heat pump 1 have the temperature end 11 persistently heated and the low-temperature end 12 persistently freezed；
Evaporation concentrator 3, evaporation concentrator 3 include heating chamber 31, and waste water enters heating chamber 31 by waterwater entrance 32, rises
Warm chamber 31 is connected by First Heat Exchanger 2A and the heat exchange of temperature end 11, and the heat of temperature end 11 is transmitted by First Heat Exchanger 2A
To make the waste water for heating up intracavitary heating be concentrated by evaporation in heating chamber 31, but the crystallization without reaching sodium sulphate and sodium chloride
Concentration, evaporation duration is shorter, temperature is lower, energy consumption is less；
Freezing and crystallizing device 4, freezing and crystallizing device 4 include cooling chamber 41, and cooling chamber 41 passes through the second heat exchanger 2B and low-temperature end
12 heat exchange connections, the waste water after the heating of evaporation concentrator 3 is concentrated by evaporation are transported by the first delivery pipe 33 and the first delivery pump 34
It is sent to fast cooling in cooling chamber 41, reduces since sodium sulphate solubility with temperature reduces, is precipitated in waste water temperature-fall period
A large amount of sal glauberi crystal；
Refrigerated centrifuge 5, refrigerated centrifuge 5 are connected to cooling chamber 41, enter the solidliquid mixture to cool down in chamber 41 cold
Freeze in centrifuge 5 and be separated by solid-liquid separation to obtain sal glauberi crystal and chlorination mother liquid of sodium, chlorination mother liquid of sodium contains whole chlorine
Change sodium and fraction sodium sulphate；
Sodium sulphate crystallizing evaporator 6, sodium sulphate crystallizing evaporator 6 is including sodium sulphate evaporative crystallization chamber 61 and for increasing sulphur
The sodium sulphate heating device of temperature, the solid of sodium sulphate evaporative crystallization chamber 61 and refrigerated centrifuge 5 in sour sodium evaporative crystallization chamber 61
Discharge port 51 is connected to, and the sal glauberi crystal for keeping refrigerated centrifuge 5 isolated enters sodium sulphate evaporative crystallization chamber 61；Sulfuric acid
Sodium heating device includes the sodium sulphate heating interlayer 62 that 61 outer wall of sodium sulphate evaporative crystallization chamber is arranged in, sodium sulphate heating interlayer 62
It is connected to heating chamber 31, the secondary steam that evaporation generates in heating chamber 31 is conveyed by the second delivery pipe 35 and the second delivery pump 36
Into sodium sulphate heating interlayer 62, to heat to 61 outer wall of sodium sulphate evaporative crystallization chamber, secondary steam is steamed in sodium sulphate
The condensed water that 61 outer wall of crystallization cavity generates is sent out to be discharged by the first condensed water discharge outlet 63；Sal glauberi is in sulfate crystal chamber
The heating hot melt evaporative crystallization that is heated in 61 forms anhydrous slufuric acid sodium crystal
Sodium sulphate centrifuge 7, sodium sulphate centrifuge 7 are connected to sodium sulphate evaporative crystallization chamber 61, make sodium sulphate evaporative crystallization
Solidliquid mixture in chamber 61 enters that sodium sulphate centrifuge 7 is separated by solid-liquid separation to obtain anhydrous slufuric acid sodium crystal and sodium sulphate is residual
Liquid；
Sodium chloride crystallizing evaporator 8, sodium chloride crystallizing evaporator 8 is including sodium chloride evaporative crystallization chamber 81 and for increasing chlorine
Change the sodium chloride heating device of temperature in sodium evaporative crystallization chamber 81, the liquid of sodium chloride evaporative crystallization chamber 81 and refrigerated centrifuge 5
Discharge port 52 is connected to, and the chlorination mother liquid of sodium for keeping refrigerated centrifuge 5 isolated enters sodium chloride evaporative crystallization chamber 81；Sodium chloride adds
Thermal includes the sodium chloride heating interlayer 82 that 81 outer wall of sodium chloride evaporative crystallization chamber is arranged in, sodium chloride heating interlayer 82 and liter
Warm chamber 31 is connected to, and the secondary steam that evaporation generates in heating chamber 31 is transported to chlorine by the second delivery pipe 35 and the second delivery pump 38
Change in sodium heating interlayer 82, to heat to 81 outer wall of sodium chloride evaporative crystallization chamber, secondary steam is evaporated in sodium chloride to be tied
The condensed water that brilliant 81 outer wall of chamber generates is discharged by the first condensed water discharge outlet 83；Chlorination mother liquid of sodium contain whole sodium chloride and
Small part sodium sulphate, chlorination mother liquid of sodium heated evaporating, concentrating and crystallizing in sodium chloride evaporative crystallization chamber 81, due to sodium sulphate content
It is less, and sodium sulphate solubility with temperature increases and increases, therefore sodium sulphate reaches far away crystallisation concentration, will not be precipitated, and chlorine
Change sodium solubility not vary with temperature and change, with the carry out concentration increase of evaporation, reaches sodium chloride crystallisation concentration, chlorine is precipitated
Change sodium crystal；
Sodium chloride centrifuge 9, sodium chloride centrifuge 9 are connected to sodium chloride evaporative crystallization chamber 81, make sodium chloride evaporative crystallization
Solidliquid mixture in chamber 81 enters sodium chloride centrifuge 9 and is separated by solid-liquid separation to obtain sodium chloride crystal and sodium chloride raffinate.
The liquid outlet opening 71 and heating chamber 31 of sodium sulphate centrifuge 7 are connected by third delivery pipe 37 and third delivery pump 38
Logical, the sodium sulphate raffinate for isolating sodium sulphate centrifuge 7 enters heating chamber 31 and is recycled again；Sodium chloride centrifuge 9
Liquid outlet opening 91 is connected to heating chamber 31 by third delivery pipe 37 and third delivery pump 38, and sodium chloride centrifuge 9 is separated
Sodium chloride raffinate out enters heating chamber 31 and is recycled again.
Sodium sulphate kettle base solution outlet 72 is provided between 7 liquid outlet opening 71 of sodium sulphate centrifuge and third delivery pipe 37
For kettle base solution sticky in sodium sulphate raffinate to be discharged；Between 9 liquid outlet opening 91 of sodium chloride centrifuge and third delivery pipe 37
Sodium chloride kettle base solution outlet 92 is provided with for kettle base solution sticky in sodium chloride raffinate to be discharged.
The invention also discloses a kind of processing methods of wastewater treatment equipment for dividing salt according to above-mentioned heat pump low temperature, use height
11 pairs of warm end heating chamber 31 heats up, and waste water enters cooling chamber 41 in heating chamber 31 after heating is concentrated by evaporation, and uses low temperature
Hold 12 pairs of cooling chambers 41 to cool down, waste water enters refrigerated centrifuge 5 after decrease temperature crystalline in cooling chamber 41, using centrifuge from
The isolated sal glauberi of 5 hearts and chlorination mother liquid of sodium；
Sal glauberi enters sodium sulphate evaporative crystallization chamber 61 from the solid outlet 51 of refrigerated centrifuge 5, uses sulfuric acid
Sodium heating device makes sodium sulphate evaporative crystallization chamber 61 heat up, and enters sodium sulphate after sal glauberi heating hot melt evaporative crystallization and is centrifuged
Machine 7 uses the isolated sodium sulfate crystal of sodium sulphate centrifuge 7 and sodium sulphate raffinate；
Chlorination mother liquid of sodium enters sodium chloride evaporative crystallization chamber 82 from the liquid outlet opening 52 of refrigerated centrifuge 5, uses chlorination
Sodium heating device makes sodium chloride evaporative crystallization chamber 82 heat up, and enters sodium chloride after chlorination mother liquid of sodium heating evaporating, concentrating and crystallizing and is centrifuged
Machine 9 uses the isolated sodium chloride crystal of sodium chloride centrifuge 9 and sodium chloride raffinate.
Referring to Fig.1, the embodiment of the present invention realizes that low temperature divides the process of salt are as follows:
Waste water enters heating chamber 31, carries out primary evaporator concentration using the heat production heating of 1 temperature end 11 of heat pump, belongs to low temperature
Low pressure evaporation, and time-consuming is not grown, and energy consumption is less；
The waste water that primary evaporator concentration finishes enters cooling chamber 41, carries out using the production of 1 low-temperature end 12 of heat pump is cold to waste water
Frozen cooling is reduced since sodium sulphate solubility with temperature reduces, and sodium chloride solubility does not vary with temperature and changes, because
This large amount of sal glauberi of precipitation is without precipitated sodium chloride, waste water isolated sal glauberi crystal in refrigerated centrifuge 5
With chlorination mother liquid of sodium；
Sal glauberi crystal enters sodium sulphate evaporative crystallization chamber 61, and the secondary steam that heating chamber 31 generates is for heating sulphur
Sour sodium evaporative crystallization chamber 61, sal glauberi crystal use sulfuric acid in the heated hot melt evaporative crystallization of sodium sulphate evaporative crystallization chamber 61
The isolated anhydrous slufuric acid sodium crystal of sodium centrifuge 7 and sodium sulphate raffinate, sodium sulphate raffinate return to heating after rejecting kettle base solution
Chamber 31 is recycled again；
Chlorination mother liquid of sodium enters sodium chloride evaporative crystallization chamber 81, and the secondary steam that heating chamber 31 generates is for heating sodium chloride
Evaporative crystallization chamber 81, containing so the chlorination mother liquid of sodium of sodium chloride and part of sulfuric acid sodium is heated in sodium chloride evaporative crystallization chamber 81
Evaporating, concentrating and crystallizing, since sodium sulphate content is less, and sodium sulphate solubility with temperature increases and increases, therefore sodium sulphate is far away
Reach crystallisation concentration, will not be precipitated, and sodium chloride solubility does not vary with temperature and changes, with the carry out concentration increasing of evaporation
Greatly, reach sodium chloride crystallisation concentration, precipitated sodium chloride crystal uses the isolated sodium chloride crystal of sodium chloride centrifuge 9 and chlorine
Change sodium raffinate, returns to heating chamber 31 after sodium chloride raffinate rejecting kettle base solution and recycled again.
Certainly the above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow be familiar with technique
People can understand the content of the present invention and implement it accordingly, it is not intended to limit the scope of the present invention, all according to this hair
The modification that the Spirit Essence of bright main technical schemes is done, should be covered by the protection scope of the present invention.
Claims (7)
1. the wastewater treatment equipment that a kind of heat pump low temperature divides salt characterized by comprising
Heat pump, the heat pump have temperature end and low-temperature end；
Evaporation concentrator, the evaporation concentrator include the heating chamber for accommodating waste water, the heating chamber and the temperature end
Heat exchange connection；
Freezing and crystallizing device, the freezing and crystallizing device include the cooling chamber for accommodating waste water, the cooling chamber and the low-temperature end
Heat exchange connection；
Refrigerated centrifuge, the refrigerated centrifuge are connected to the cooling chamber, and the solidliquid mixture for keeping the cooling intracavitary enters
It is separated by solid-liquid separation in the refrigerated centrifuge；
Sodium sulphate crystallizing evaporator, the sodium sulphate crystallizing evaporator include sodium sulphate evaporative crystallization chamber and for increasing sodium sulphate
The solid of the sodium sulphate heating device of evaporative crystallization cavity temperature, the sodium sulphate evaporative crystallization chamber and the refrigerated centrifuge goes out
Material mouth connection, the solid for keeping the refrigerated centrifuge isolated enter the sodium sulphate evaporative crystallization chamber；
Sodium sulphate centrifuge, the sodium sulphate centrifuge are connected to the sodium sulphate evaporative crystallization chamber, evaporate the sodium sulphate
Solidliquid mixture in crystallization cavity enters the sodium sulphate centrifuge and is separated by solid-liquid separation；
Sodium chloride crystallizing evaporator, the sodium chloride crystallizing evaporator include sodium chloride evaporative crystallization chamber and for increasing sodium chloride
The sodium chloride heating device of evaporative crystallization cavity temperature, the liquid discharge of the sodium chloride evaporative crystallization chamber and the refrigerated centrifuge
Material mouth connection, the waste water for keeping the refrigerated centrifuge isolated enter the sodium chloride evaporative crystallization chamber；
Sodium chloride centrifuge, the sodium chloride centrifuge are connected to the sodium chloride evaporative crystallization chamber, evaporate the sodium chloride
Solidliquid mixture in crystallization cavity enters the sodium chloride centrifuge and is separated by solid-liquid separation.
2. the wastewater treatment equipment that heat pump low temperature according to claim 1 divides salt, which is characterized in that the sodium sulphate centrifugation
The liquid outlet opening of machine is connected to the heating chamber, the waste water for isolating the sodium sulphate centrifuge enter the heating chamber into
Row recycles again, and the liquid outlet opening of the sodium chloride centrifuge is connected to the heating chamber, makes the sodium chloride centrifuge point
The waste water separated out enters the heating chamber and is recycled again.
3. the wastewater treatment equipment that heat pump low temperature according to claim 2 divides salt, which is characterized in that the temperature end and institute
It states fire end and heat exchange connection is carried out by First Heat Exchanger, the low-temperature end is changed with the freezing end by the second heat exchanger
It is thermally connected.
4. the wastewater treatment equipment that heat pump low temperature according to claim 3 divides salt, which is characterized in that be connected to the sodium sulphate
Centrifuge liquid outlet opening and it is described heating chamber pipeline on be provided with sodium sulphate kettle base solution outlet, be connected to the sodium chloride from
Sodium chloride kettle base solution outlet is provided on the pipeline of scheming liquid outlet opening and the heating chamber.
5. the wastewater treatment equipment that heat pump low temperature according to claim 1-4 divides salt, which is characterized in that described
Sodium sulphate heating device is connected to the heating chamber, and the secondary steam for keeping the heating intracavitary passes through the sodium sulphate heating device
The substance intracavitary to the sodium sulphate evaporative crystallization heats, and the sodium chloride heating device is connected to the heating chamber, makes
The intracavitary secondary steam of the heating by the sodium chloride heating device substance intracavitary to the sodium chloride evaporative crystallization into
Row heating.
6. the wastewater treatment equipment that heat pump low temperature according to claim 5 divides salt, which is characterized in that the sodium sulphate heating
Device includes the sodium sulphate heating interlayer that the sodium sulphate evaporative crystallization cavity outer wall is arranged in, the sodium sulphate heating interlayer and institute
Heating chamber connection is stated, the sodium chloride heating device includes the sodium chloride heating that the sodium chloride evaporative crystallization cavity outer wall is arranged in
Interlayer, the sodium chloride heating interlayer are connected to the heating chamber.
7. the processing method that a kind of heat pump low temperature according to claim 1 divides the wastewater treatment equipment of salt, which is characterized in that
It is heated up using the temperature end to the heating chamber, waste water enters the drop after the intracavitary heating of heating is concentrated by evaporation
Warm chamber cools down to the cooling chamber using the low-temperature end, and waste water enters described after the intracavitary decrease temperature crystalline of cooling
Refrigerated centrifuge is centrifugally separating to obtain sal glauberi and chlorination mother liquid of sodium using the centrifuge；
Sal glauberi enters the sodium sulphate evaporative crystallization chamber from the solid outlet of the refrigerated centrifuge, uses the sulphur
Sour sodium heating device makes the sodium sulphate evaporative crystallization chamber heat up, and enters institute after the sal glauberi heating hot melt evaporative crystallization
Sodium sulphate centrifuge is stated, the isolated sodium sulfate crystal of the sodium sulphate centrifuge and sodium sulphate raffinate are used；
Chlorination mother liquid of sodium enters the sodium chloride evaporative crystallization chamber from the liquid outlet opening of the refrigerated centrifuge, uses the chlorine
Changing sodium heating device makes the sodium chloride evaporative crystallization chamber heat up, and enters institute after the chlorination mother liquid of sodium heating evaporating, concentrating and crystallizing
Sodium chloride centrifuge is stated, the isolated sodium chloride crystal of the sodium chloride centrifuge and sodium chloride raffinate are used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910015558.XA CN109607923A (en) | 2019-01-07 | 2019-01-07 | A kind of heat pump low temperature divides the wastewater treatment equipment of salt |
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| CN112939030A (en) * | 2021-03-12 | 2021-06-11 | 合众思(北京)环境工程有限公司 | Process for thermal separation and co-production of low-COD high-purity salt nitrate from nitrate-containing wastewater |
| CN114394706A (en) * | 2021-12-07 | 2022-04-26 | 陕西航天机电环境工程设计院有限责任公司 | Evaporation-freezing coupling high-concentration salt wastewater treatment method and system based on heat pump |
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