CN204614460U - Boron-containing radioactive waste liquid deep purifying reclaims the equipment of boric acid simultaneously - Google Patents
Boron-containing radioactive waste liquid deep purifying reclaims the equipment of boric acid simultaneously Download PDFInfo
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- CN204614460U CN204614460U CN201520230409.2U CN201520230409U CN204614460U CN 204614460 U CN204614460 U CN 204614460U CN 201520230409 U CN201520230409 U CN 201520230409U CN 204614460 U CN204614460 U CN 204614460U
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Abstract
A kind of boron-containing radioactive waste liquid deep purifying reclaims the equipment of boric acid simultaneously, comprise waste liquid deep purifying and boric acid pre-concentration unit, boric acid upgrading unit and boric acid crystallization and recovery unit, waste liquid deep purifying and boric acid pre-concentration unit comprise the middle exhausted bath box, supercharge pump, prefilter, heat interchanger, one-level high-pressure pump, recuperator, high pressure counter-osmosis device, secondary high-pressure pump, low pressure reverse osmosis device and the concentrate case that connect successively; Boric acid upgrading unit comprises charging pump, well heater, evaporator, ebullator, demister, clarifier, condenser, surge tank, concentrate discharging pump; Boric acid crystallization and recovery unit comprise heat interchanger, ebullator, crystallizer, magma discharging pump, transfer tank, mother liquor tank and filter centrifugal, ion exchange column.Waste liquid can be carried out deep purifying by the utility model while recovery boric acid, and equipment volume and process energy consumption greatly decline, and can avoid outwards discharging secondary liquid waste.
Description
Technical field
The utility model relates to the equipment that a kind of boron-containing radioactive waste liquid deep purifying reclaims boric acid simultaneously.
Background technology
Nuclear power plant can produce a large amount of radioactive liquid waste in the operation and maintenance stage, and also contain soluble neutron absorber---boric acid in the waste liquid that wherein power plant's primary Ioops is discharged, the waste liquid that primary Ioops is discharged becomes boron-containing radioactive waste liquid.Boron-containing radioactive waste liquid have to pass through except boron, could to environmental emission except after radioactivity.In order to reduce the impact of discharging of waste liquid on environment to greatest extent, some nuclear power plants also require to carry out deep purifying to the treated waste liquid reaching emission standard.For the boric acid in waste liquid, some nuclear power plants are provided with boron recovery system, borate waste solution are condensed into utilization and recycle after dense boron liquid by evaporation technology; Some nuclear power plants do not arrange boron recovery system, need discharge after borate waste solution purification.
At present, what the process of nuclear power plant's boron-containing radioactive waste liquid adopted mostly is ion-exchange or evaporation technology.Ion-exchange process utilizes ion exchange resin to adsorb radioactive nuclide in waste liquid, the radioactive concentration of waste liquid can be reduced to below emission limit.Ion-exchange process is ripe, but cannot remove the boric acid in waste liquid.Evaporation technology be then by heating steam by waste liquid in evaporator ebuillition of heated vaporization, vaporization produce secondary steam condensed fluid after testing radioactive concentration qualified after discharged, steam raffinate then carry out cement solidification process.The good purification of evaporation technology, but shortcoming to be thermal energy consumption large, disposal cost is very high, and vapo(u)rization system more complicated, and the workload of operation and maintenance maintenance is all very large.
Also there is the report adopting additive method process borate waste solution, but be all not suitable for the deep purifying of nuclear power plant's boron-containing radioactive waste liquid and boric acid reclaims.Such as Chinese patent 02108593.5, it adopts two-stage oxidizing/flocculation process process boron-containing radioactive waste water, namely first in waste water, oxygenant and inorganic flocculating agent is added, through first order oxidation/flocculation, add polymeric flocculant again and carry out Separation of Solid and Liquid, and then add medicament and carry out second level oxidation/flocculation.The complex process of this method, need consume a large amount of chemical agents, produces a large amount of radioactivity mud simultaneously, secondary Waste disposal high cost.
Utility model content
The utility model provides a kind of boron-containing radioactive waste liquid deep purifying to reclaim the equipment of boric acid simultaneously, while recovery boric acid, waste liquid can be carried out deep purifying, without the need to consuming a large amount of chemical agent, equipment volume and process energy consumption greatly decline, waste liquid radioactive concentration after purification is significantly less than the emission limit of national Specification, and can avoid outwards discharging secondary liquid waste.
Boron-containing radioactive waste liquid deep purifying reclaims an equipment for boric acid simultaneously, it is characterized in that: comprise waste liquid deep purifying and boric acid pre-concentration unit, boric acid upgrading unit and boric acid crystallization and recovery unit,
Waste liquid deep purifying and boric acid pre-concentration unit comprise the middle exhausted bath box, supercharge pump, prefilter, heat interchanger, one-level high-pressure pump, recuperator, high pressure counter-osmosis device, secondary high-pressure pump, low pressure reverse osmosis device and the concentrate case that connect successively, the permeate endpiece of its mesohigh counter-osmosis device is connected with low pressure reverse osmosis device by secondary high-pressure pump, the concentrated solution outlet end of high pressure counter-osmosis device is connect by recuperator and middle exhausted bath box or concentrate case, and the concentrated solution outlet end of low pressure reverse osmosis device is connected with middle exhausted bath box or concentrate case;
Boric acid upgrading unit comprises charging pump, well heater, evaporator, ebullator, demister, clarifier, condenser, surge tank, concentrate discharging pump, concentrate case is connected with the entrance point of ebullator by charging pump, the steam (vapor) outlet end of evaporator and demister, clarifier, condenser, surge tank connects successively, demister is connected with the entrance point of well heater by ebullator with the liquid outlet end of clarifier, the endpiece of well heater is connected with the liquor inlet end of evaporator, the bottom material liquid outlet of evaporator is connected with concentrate discharging pump, for boron concentrate is discharged,
Boric acid crystallization and recovery unit comprise heat interchanger, ebullator, crystallizer, magma discharging pump, transfer tank, mother liquor tank and filter centrifugal, ion exchange column, the material liquid outlet end of crystallizer is connected with the entrance point of heat interchanger by ebullator, pipeline between the pipe outlet access ebullator of the concentrate discharging pump of boric acid upgrading unit end and the entrance point of heat interchanger, the endpiece of heat interchanger is connected with the entrance point of crystallizer, the magma endpiece of crystallizer is connected with transfer tank by magma discharging pump, transfer tank is used for carrying out Separation of Solid and Liquid to magma, the clarified mother liquor obtained drains into mother liquor tank, solid then enters filter centrifugal, residual liquid in solid filters by filter centrifugal, the liquid leached drains into mother liquor tank, the solid retained is then as final boric acid product, the solution received in mother liquor tank is first processed by ion exchange column, return concentrate case after radioactive nuclide in mother liquor is retained removal and carry out circular treatment.
Equipment as above, evaporator maintains certain vacuum tightness, ensures that the working pressure in evaporator is 10 ~ 40kPa.
The effect adopting technical solutions of the utility model to bring and advantage are:
(1) while recovery boric acid, waste liquid can be carried out deep purifying, the waste liquid radioactive concentration after purification is significantly less than the emission limit of national Specification, and radioactive nuclide can not be accumulated in concentrate, can ensure the normal operation of system;
(2) after deep purifying and the process of boric acid pre-concentration, the volume of waste liquid is reduced to original 1/10 ~ 1/15, and the treatment capacity of upgrading unit reduces greatly, not only greatly can reduce the energy consumption of upgrading unit, can also make upgrading unit device miniaturization;
(3) except boric acid crystal reaches except the scavenging solution of emission standard with purification is qualified, outwards secondary liquid waste is not discharged.
Accompanying drawing explanation
Fig. 1 is the structural representation that the utility model boron-containing radioactive waste liquid deep purifying reclaims waste liquid deep purifying and boric acid pre-concentration unit in the equipment of boric acid simultaneously;
Fig. 2 is the structural representation that the utility model boron-containing radioactive waste liquid deep purifying reclaims the equipment mesoboric acid upgrading unit of boric acid simultaneously;
Fig. 3 is that the utility model boron-containing radioactive waste liquid deep purifying reclaims the equipment mesoboric acid crystallization of boric acid and the structural representation of recovery unit simultaneously;
Fig. 4 adopts the utility model to carry out the schematic flow sheet that boron-containing radioactive waste liquid deep purifying reclaims boric acid method simultaneously.
In figure: 1-waste liquid deep purifying and boric acid pre-concentration unit, 2-boric acid upgrading unit, the crystallization of 3-boric acid and recovery unit, 11-middle exhausted bath box, 12-supercharge pump, 13-prefilter, 14-heat interchanger, 15-one-level high-pressure pump, 16-recuperator, 17-high pressure counter-osmosis device, 18-secondary high-pressure pump, 19-low pressure reverse osmosis device, 20-concentrate case, 21-charging pump, 22-well heater, 23-evaporator, 24-ebullator, 25-demister, 26-clarifier, 27-condenser, 28-surge tank, 29-concentrate discharging pump, 31-heat interchanger, 32-ebullator, 33-crystallizer, 34-magma discharging pump, 35-transfer tank, 36-mother liquor tank, 37-filter centrifugal, 38-ion exchange column.
Embodiment
Below in conjunction with the accompanying drawing in the utility model, the technical scheme in the utility model is clearly and completely described.
Please refer to Fig. 1-3, the utility model provides a kind of boron-containing radioactive waste liquid deep purifying to reclaim the equipment of boric acid simultaneously, comprises waste liquid deep purifying and boric acid pre-concentration unit 1, boric acid upgrading unit 2 and boric acid crystallization and recovery unit 3.
As shown in Figure 1, waste liquid deep purifying and boric acid pre-concentration unit 1 comprise the middle exhausted bath box 11 connected successively, supercharge pump 12, prefilter 13, heat interchanger 14, one-level high-pressure pump 15, recuperator 16, high pressure counter-osmosis device 17, secondary high-pressure pump 18, low pressure reverse osmosis device 19 and concentrate case 20, the permeate endpiece of its mesohigh counter-osmosis device 17 is connected with low pressure reverse osmosis device 19 by secondary high-pressure pump 18, the concentrated solution outlet end of high pressure counter-osmosis device 17 is connected with middle exhausted bath box 11 or concentrate case 20 by recuperator 16, the concentrated solution outlet end of low pressure reverse osmosis device 19 is connected with middle exhausted bath box 11 or concentrate case 20.
Incorporated by reference to reference to figure 4, the boron-containing radioactive waste liquid through rough handling is first stored in middle exhausted bath box 11, then sends into prefilter 13 by supercharge pump 12 and filters, retain the suspended impurity that may remain in waste liquid.Waste liquid after filtration is by a heat interchanger 14, by heating medium, waste liquid temperature is heated between 15 ~ 35 DEG C, then by one-level high-pressure pump 15, the pressure of waste liquid is brought up to 1.0 ~ 4.0MPa, pressure is brought up to 2.0 ~ 5.0MPa through a recuperator 16 by waste liquid after pressurization more further.Waste liquid after pressurization enters high pressure counter-osmosis device 17 to carry out process and obtains permeate and concentrate, and the radioactive concentration of the permeate of high pressure counter-osmosis device 17 can reduce greatly; Meanwhile, in waste liquid, the boron of 90% ~ 98% is trapped within the concentrate of high pressure counter-osmosis device 17, and only has the boron of 2% ~ 10% to remain in permeate.The permeate of high pressure counter-osmosis device 17 is forced into through secondary high-pressure pump 18 and enters low pressure reverse osmosis device 19 after 0.5 ~ 2.0MPa and process, and the radioactive concentration of the permeate of low pressure reverse osmosis device 19 reduces further; Meanwhile, the boron entering in the waste liquid of low pressure reverse osmosis device 19 40% ~ 60% is trapped within the concentrate of low pressure reverse osmosis device 19, and the permeate boron concentration of low pressure reverse osmosis device 19 also reduces further.The permeate of low pressure reverse osmosis device 19, as the waste liquid after final process, is sent in nuclear power plant's discharging of waste liquid groove, discharge to be detected.
High pressure counter-osmosis device 17 concentrate is introduced into recuperator 16, in recuperator 16 by energy transferring to the water outlet of one-level high-pressure pump 15, to improve the intake pressure of high pressure counter-osmosis device 17.High pressure counter-osmosis device 17 concentrate turns back to middle exhausted bath box 11 or drains into concentrate case 20 after flowing out from recuperator 16.The concentrate of low pressure reverse osmosis device 19 also turns back to middle exhausted bath box 11 or drains into concentrate case 20.
Electric heating tube or heating coil are installed in concentrate case 20, ensure in the winter time low temperature time, concentrate temperature is not less than 15 DEG C, prevents the boric acid crystallization in concentrate.
As shown in Figure 2, boric acid upgrading unit 2 comprises charging pump 21, well heater 22, evaporator 23, ebullator 24, demister 25, clarifier 26, condenser 27, surge tank 28, concentrate discharging pump 29.
Concentrate case 20 is connected with the entrance point of evaporator 23 by charging pump 21, like this, injected the entrance point of ebullator 24 by charging pump 21 from the reverse osmosis concentrated liquid in the concentrate case 20 of waste liquid deep purifying and boric acid pre-concentration unit 1, the steam (vapor) outlet end of evaporator 23 is connected successively with demister 25, clarifier 26, condenser 27, surge tank 28, demister 25 is connected by the entrance point of ebullator 24 with well heater 22 with the liquid outlet end of clarifier 26, and the endpiece of well heater 22 is connected with the liquor inlet end of evaporator 23.The liquid that demister 25 and clarifier 26 are collected also sends into well heater 22 from liquid outlet end through ebullator 24, and material enters evaporator 23 be heated to 60 DEG C in well heater 22 after.The heating medium of well heater 22 can be heating steam, also can be conduction oil.The secondary steam produced in evaporator 23 is introduced into demister 25, by the drop separation of carrying secretly in secondary steam out, and then by a clarifier 26, the fine mist that may remain in secondary steam is retained, thus is purified by secondary steam.Secondary steam after purification, by a condenser 27, is condensed into condensed fluid, and condensed fluid enters surge tank 28 and keeps in.Evaporator 23 maintains certain vacuum tightness usually, ensures that the working pressure in evaporator 23 is 10 ~ 40kPa, makes concentrate can carry out explosive evaporatoin at 50 ~ 70 DEG C.The bottom material liquid outlet of evaporator 23 is connected with concentrate discharging pump 29, for being discharged by boron concentrate.
As shown in Figure 3, boric acid crystallization and recovery unit 3 comprise heat interchanger 31, ebullator 32, crystallizer 33, magma discharging pump 34, transfer tank 35, mother liquor tank 36, filter centrifugal 37, ion exchange column 38.The material liquid outlet end of crystallizer 33 is connected with the entrance point of heat interchanger 31 by ebullator 32, pipeline between the pipeline access ebullator 32 of the concentrate discharging pump 29 of boric acid upgrading unit 2 end and the entrance point of heat interchanger 31, like this, heat interchanger 31 is entered together with the circulating mother liquor that the concentration of evaporating generation by boric acid upgrading unit 2 is 22000 ~ 2600ppm, temperature is 50 ~ 70 DEG C boron concentrate and ebullator 32 export.In heat interchanger 31, the feed liquid that boron concentrate and circulating mother liquor are mixed to get is cooled to 10 DEG C, under the promotion of ebullator 32, send into crystallizer 33.In crystallizer 33, feed liquid is along certain channel flow, and iterative cycles, keeps uniform degree of supersaturation and lower degree of supercooling, complete crystallization process.The endpiece of heat interchanger 31 is connected with the entrance point of crystallizer 33.
The magma endpiece of crystallizer 33 is connected with transfer tank 35 by magma discharging pump 34, and the magma that crystallizer 33 produces is drained into transfer tank 35 by magma discharging pump 34.Transfer tank 35 is for carrying out Separation of Solid and Liquid to magma, the clarified mother liquor obtained drains into mother liquor tank 36, solid then enters filter centrifugal 37 and is further processed, residual liquid in solid filters by filter centrifugal 37, the liquid leached also drains into mother liquor tank 36, the solid retained then as final boric acid product, can be recycled.The solution received in mother liquor tank 36 is first processed by an ion exchange column 38, and radioactive nuclide in mother liquor is retained removal.Remove radioactive mother liquor and return concentrate case 20 again, send into boric acid upgrading unit 2 and carry out circular treatment.
The above; be only embodiment of the present utility model; but protection domain of the present utility model is not limited thereto; anyly belong to those skilled in the art in the technical scope that the utility model discloses; the change that can expect easily or replacement, all should be encompassed within protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of claim.
Claims (2)
1. a boron-containing radioactive waste liquid deep purifying reclaims the equipment of boric acid simultaneously, it is characterized in that: comprise waste liquid deep purifying and boric acid pre-concentration unit (1), boric acid upgrading unit (2) and boric acid crystallization and recovery unit (3)
Waste liquid deep purifying and boric acid pre-concentration unit (1) comprise the middle exhausted bath box (11) connected successively, supercharge pump (12), prefilter (13), heat interchanger (14), one-level high-pressure pump (15), recuperator (16), high pressure counter-osmosis device (17), secondary high-pressure pump (18), low pressure reverse osmosis device (19) and concentrate case (20), the permeate endpiece of its mesohigh counter-osmosis device (17) is connected with low pressure reverse osmosis device (19) by secondary high-pressure pump (18), the concentrated solution outlet end of high pressure counter-osmosis device (17) is connect by recuperator (16) and middle exhausted bath box (11) or concentrate case (20), the concentrated solution outlet end of low pressure reverse osmosis device (19) is connected with middle exhausted bath box (11) or concentrate case (20),
Boric acid upgrading unit (2) comprises charging pump (21), well heater (22), evaporator (23), ebullator (24), demister (25), clarifier (26), condenser (27), surge tank (28), concentrate discharging pump (29), concentrate case (20) is connected by the entrance point of charging pump (21) with ebullator (24), the steam (vapor) outlet end of evaporator (23) and demister (25), clarifier (26), condenser (27), surge tank (28) connects successively, demister (25) is connected by the entrance point of ebullator (24) with well heater (22) with the liquid outlet end of clarifier (26), the endpiece of well heater (22) is connected with the liquor inlet end of evaporator (23), the bottom material liquid outlet of evaporator (23) is connected with concentrate discharging pump (29), for boron concentrate is discharged,
Boric acid crystallization and recovery unit (3) comprise heat interchanger (31), ebullator (32), crystallizer (33), magma discharging pump (34), transfer tank (35), mother liquor tank (36) and filter centrifugal (37), ion exchange column (38), the material liquid outlet end of crystallizer (33) is connected with the entrance point of heat interchanger (31) by ebullator (32), pipeline between pipe outlet access ebullator (32) of the concentrate discharging pump (29) of boric acid upgrading unit (2) end and the entrance point of heat interchanger (31), the endpiece of heat interchanger (31) is connected with the entrance point of crystallizer (33), the magma endpiece of crystallizer (33) is connected with transfer tank (35) by magma discharging pump (34), transfer tank (35) is for carrying out Separation of Solid and Liquid to magma, the clarified mother liquor obtained drains into mother liquor tank (36), solid then enters filter centrifugal (37), residual liquid in solid filters by filter centrifugal (37), the liquid leached drains into mother liquor tank (36), the solid retained is then as final boric acid product, the solution received in mother liquor tank (36) is first processed by ion exchange column (38), return concentrate case (20) after radioactive nuclide in mother liquor is retained removal and carry out circular treatment.
2. boron-containing radioactive waste liquid deep purifying as claimed in claim 1 reclaims the equipment of boric acid simultaneously, it is characterized in that: evaporator (23) maintains certain vacuum tightness, ensures that the working pressure in evaporator (23) is 10 ~ 40kPa.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104810071A (en) * | 2015-04-16 | 2015-07-29 | 湖南桃花江核电有限公司 | Method and equipment for deep purifying of boron-containing radioactive waste liquid and recovery of boric acid |
| CN108689544A (en) * | 2018-07-24 | 2018-10-23 | 苏州方舟环保科技有限公司 | A kind of the waste water containing boron processing unit and method of zero-emission |
| CN110473644A (en) * | 2018-05-09 | 2019-11-19 | 上海核工程研究设计院有限公司 | A kind of device and method that radioactive liquid waste removes boron |
| CN110473643A (en) * | 2018-05-09 | 2019-11-19 | 上海核工程研究设计院有限公司 | A kind of device and method that radioactive liquid waste removes boron |
-
2015
- 2015-04-16 CN CN201520230409.2U patent/CN204614460U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104810071A (en) * | 2015-04-16 | 2015-07-29 | 湖南桃花江核电有限公司 | Method and equipment for deep purifying of boron-containing radioactive waste liquid and recovery of boric acid |
| CN104810071B (en) * | 2015-04-16 | 2017-02-22 | 湖南桃花江核电有限公司 | Method and equipment for deep purifying of boron-containing radioactive waste liquid and recovery of boric acid |
| CN110473644A (en) * | 2018-05-09 | 2019-11-19 | 上海核工程研究设计院有限公司 | A kind of device and method that radioactive liquid waste removes boron |
| CN110473643A (en) * | 2018-05-09 | 2019-11-19 | 上海核工程研究设计院有限公司 | A kind of device and method that radioactive liquid waste removes boron |
| CN110473643B (en) * | 2018-05-09 | 2024-06-07 | 上海核工程研究设计院股份有限公司 | Device and method for removing boron from radioactive waste liquid |
| CN108689544A (en) * | 2018-07-24 | 2018-10-23 | 苏州方舟环保科技有限公司 | A kind of the waste water containing boron processing unit and method of zero-emission |
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