CN109761424B - Method for low-temperature evaporation, salt separation and resource recovery of miscellaneous strong brine - Google Patents
Method for low-temperature evaporation, salt separation and resource recovery of miscellaneous strong brine Download PDFInfo
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- CN109761424B CN109761424B CN201910085933.8A CN201910085933A CN109761424B CN 109761424 B CN109761424 B CN 109761424B CN 201910085933 A CN201910085933 A CN 201910085933A CN 109761424 B CN109761424 B CN 109761424B
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- 239000012267 brine Substances 0.000 title claims abstract description 184
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 title claims abstract description 184
- 150000003839 salts Chemical class 0.000 title claims abstract description 57
- 238000001704 evaporation Methods 0.000 title claims abstract description 42
- 238000000926 separation method Methods 0.000 title claims abstract description 30
- 230000008020 evaporation Effects 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000011084 recovery Methods 0.000 title claims abstract description 18
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 8
- 239000000706 filtrate Substances 0.000 claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 229920000742 Cotton Polymers 0.000 claims description 7
- 238000001223 reverse osmosis Methods 0.000 claims description 5
- 238000009413 insulation Methods 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 238000004064 recycling Methods 0.000 abstract description 3
- 238000002425 crystallisation Methods 0.000 abstract description 2
- 230000008025 crystallization Effects 0.000 abstract description 2
- 230000008014 freezing Effects 0.000 abstract description 2
- 238000007710 freezing Methods 0.000 abstract description 2
- 238000000746 purification Methods 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 9
- 238000004321 preservation Methods 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention relates to the technical field of strong brine recovery, in particular to a method for low-temperature evaporation salt separation and resource recovery of miscellaneous strong brine. The method for low-temperature evaporation, salt separation and resource recovery of the miscellaneous strong brine comprises the following steps: detecting the conductivity of strong brine; step two, pretreatment is carried out according to different situations; thirdly, evaporating and recovering monovalent brine through a low-temperature evaporator, and placing divalent or multivalent brine in a second low-temperature evaporator; step four, the first centrifugal separator centrifugally separates; step five, the second centrifugal separator centrifugally separates; a heat source pump and a heat exchanger are connected between the second centrifugal separator and a brine storage tank for containing the divalent or multivalent brine. The method can separate, purify and recycle the strong brine for reuse, and meanwhile, the cyclic purification and recycle are carried out by adopting a low-temperature evaporation system and a freezing crystallization system, and energy recycling is carried out by a heat source pump, so that the energy consumption is reduced, and the energy consumption is obviously lower than that of a high-temperature MVR evaporation system and a multi-effect evaporation system.
Description
Technical Field
The invention relates to the technical field of strong brine recovery, in particular to a method for low-temperature evaporation salt separation and resource recovery of miscellaneous strong brine.
Background
The national environmental protection has stricter and stricter requirements on the discharge of sewage, especially large-scale combined petroleum and chemical enterprises, and the requirement on zero discharge of sewage is more and more common. In order to improve the current environmental situation, the national management of three wastes is getting tighter and tighter, industrial zero emission is accepted by a plurality of enterprises and professionals, and meanwhile, the industrial zero emission is gradually implemented in the industrial field. The water is used as an indispensable resource in the industrial field, and the discharge of concentrated brine is used as an important environmental protection index.
The concentrated brine in the existing sewage treatment generally contains components of miscellaneous salts, various evaporation modes such as single-effect evaporation, multi-effect evaporation or MVR evaporation are generally adopted for treating the concentrated brine at present, however, the salts obtained by the existing treatment modes are miscellaneous salts which cannot be utilized, and the miscellaneous salts are often regarded as dangerous wastes and cannot be treated. The miscellaneous salt is finally sealed in the pool as nuclear waste. However, this not only does not solve the actual problem, but also leaves the pollution problem to offspring.
Disclosure of Invention
The invention aims to provide a method for low-temperature evaporation salt separation and resource recovery of miscellaneous strong brine, aiming at the defects of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
provides a method for evaporating and separating salt of miscellaneous strong brine at low temperature and recovering resources, which comprises the following steps:
step one, detecting the conductivity of strong brine: detecting the conductivity of the strong brine;
step two, case-by-case pretreatment: in the first case, when the conductivity of the strong brine is less than 20000 mus, firstly obtaining monovalent brine, divalent brine or polyvalent brine by NF salt separation, then concentrating the monovalent brine, the divalent brine or the polyvalent brine to the conductivity of 6-10 ten thousand mus, respectively obtaining the concentrated monovalent brine, the divalent brine or the polyvalent brine, and respectively containing the monovalent brine, the divalent brine or the polyvalent brine by a brine storage tank;
in the second case, when the conductivity of the strong brine is more than 20000 mus and less than 60000 mus, the strong brine is directly concentrated to the conductivity of 6 ten thousand to 10 ten thousand mus without NF salt separation, so as to respectively obtain concentrated monovalent brine, divalent or multivalent brine, and the monovalent brine, the divalent or multivalent brine are respectively contained in a brine storage tank;
in the third case, when the conductivity of the strong brine is more than 60000 mu s, the strong brine is directly evaporated and recovered by a low-temperature evaporator;
step three, directly evaporating and recovering monovalent brine obtained in the first condition and the second condition of the step two through a low-temperature evaporator; placing the divalent or multivalent brine obtained in the first case and the second case of the second step into a second low-temperature evaporator;
step four, centrifugal separation of the first centrifugal separator: centrifuging the divalent or multivalent salt water placed in the second low-temperature evaporator in the third step by using a first centrifugal separator at normal temperature to separate out salt insensitive to temperature and obtain first filtrate;
step five, the second centrifugal separator centrifugally separates: placing the first filtrate obtained in the fourth step in a second centrifugal separator at a certain temperature, then carrying out centrifugal treatment to separate out salt with the solubility sensitive to the temperature change, obtaining a second filtrate, and converging the second filtrate into a brine storage tank used for containing divalent or multivalent brine in the second step for cyclic treatment;
wherein a heat source pump and a heat exchanger are connected between the second centrifugal separator and a brine storage tank for containing divalent or multivalent brine.
In the above technical solution, in the second step, the concentration is performed by high pressure reverse osmosis treatment.
In the above technical solution, in the second step, the concentration is performed by DTRO treatment.
In the above technical solution, in the fifth step, the temperature of the second centrifugal separator is set to 5 ℃ to 15 ℃.
In the above technical solution, in the fifth step, the temperature of the second centrifugal separator is set to 10 ℃.
In the above technical solution, in the fifth step, the outer wall surface of the second centrifugal separator is coated with heat insulation cotton.
In the above technical scheme, in the second step, the processing temperature of the low-temperature evaporator is set to 35 ℃ to 70 ℃.
In the above technical scheme, in the third step, the temperature of the second low-temperature evaporator is set to 35 ℃ to 70 ℃.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention provides a method for low-temperature evaporation, salt separation and resource recovery of miscellaneous strong brine, which comprises the following steps: detecting the conductivity of strong brine; step two, pretreatment is carried out according to different situations; thirdly, evaporating and recovering monovalent brine through a low-temperature evaporator, and placing divalent or multivalent brine in a second low-temperature evaporator; step four, the first centrifugal separator centrifugally separates; step five, the second centrifugal separator centrifugally separates; a heat source pump and a heat exchanger are connected between the second centrifugal separator and a brine storage tank for containing the divalent or multivalent brine. The method for separating the salt and recovering the resource by low-temperature evaporation of the miscellaneous strong brine can separate and purify the strong brine for recycling, meanwhile, the low-temperature evaporation system and the freezing crystallization system are adopted for circulating purification and recovery, and the heat source pump is used for recycling energy, so that the energy consumption is reduced, and the energy consumption is obviously lower than that of a high-temperature MVR evaporation system and a multi-effect evaporation system.
(2) The method for evaporating and separating the salt of the miscellaneous strong brine at low temperature and recovering the resources has the characteristics of simple method, low production cost and suitability for large-scale production.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more apparent, the present invention is further described in detail below with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Wherein, the DTRO mentioned in the invention refers to the disc tube type reverse osmosis.
Example 1.
A method for evaporating and separating salt of miscellaneous strong brine at low temperature and recovering resources comprises the following steps:
step one, detecting the conductivity of strong brine: detecting the conductivity of the strong brine;
step two, case-by-case pretreatment: in the first case, when the conductivity of the strong brine is less than 20000 mus, firstly obtaining monovalent brine, divalent brine or polyvalent brine by NF salt separation, concentrating the monovalent brine, the divalent brine or the polyvalent brine by high-pressure reverse osmosis treatment until the conductivity is 6-10 ten thousand mus, respectively obtaining the concentrated monovalent brine, the divalent brine or the polyvalent brine, and respectively containing the monovalent brine, the divalent brine or the polyvalent brine in a brine storage tank;
in this embodiment, the processing temperature of the low-temperature evaporator is set to 50 ℃;
step three, directly evaporating and recovering monovalent brine obtained in the first condition and the second condition of the step two through a low-temperature evaporator; placing the divalent or multivalent brine obtained in the first case and the second case of the second step into a second low-temperature evaporator; in this embodiment, the temperature of the second low-temperature evaporator is set to 50 ℃;
step four, centrifugal separation of the first centrifugal separator: centrifuging the divalent or multivalent salt water placed in the second low-temperature evaporator in the third step by using a first centrifugal separator at normal temperature to separate out salt insensitive to temperature and obtain first filtrate;
step five, the second centrifugal separator centrifugally separates: placing the first filtrate obtained in the fourth step in a second centrifugal separator at 10 ℃, then carrying out centrifugal treatment to separate out salt with the solubility sensitive to temperature change and obtain a second filtrate, and converging the second filtrate into a brine storage tank used for containing divalent or multivalent brine in the second step for cyclic treatment; wherein, the outer wall surface of the second centrifugal separator is coated with heat preservation cotton;
wherein a heat source pump and a heat exchanger are connected between the second centrifugal separator and a brine storage tank for containing the divalent or multivalent brine.
Example 2.
A method for evaporating and separating salt of miscellaneous strong brine at low temperature and recovering resources comprises the following steps:
step one, detecting the conductivity of strong brine: detecting the conductivity of the strong brine;
step two, case-by-case pretreatment: in the second case, when the conductivity of the strong brine is more than 20000 mus and less than 60000 mus, directly carrying out DTRO treatment without NF salt separation to concentrate the strong brine to the conductivity of 6-10 ten thousand mus, respectively obtaining monovalent brine, divalent or multivalent brine after concentration, and respectively containing the monovalent brine, the divalent or multivalent brine in a brine storage tank;
in this embodiment, the processing temperature of the low-temperature evaporator is set to 40 ℃;
step three, directly evaporating and recovering monovalent brine obtained in the first condition and the second condition of the step two through a low-temperature evaporator; placing the divalent or multivalent brine obtained in the first case and the second case of the second step into a second low-temperature evaporator; in this embodiment, the temperature of the second low-temperature evaporator is set to 40 ℃;
step four, centrifugal separation of the first centrifugal separator: centrifuging the divalent or multivalent salt water placed in the second low-temperature evaporator in the third step by using a first centrifugal separator at normal temperature to separate out salt insensitive to temperature and obtain first filtrate;
step five, the second centrifugal separator centrifugally separates: placing the first filtrate obtained in the fourth step in a second centrifugal separator at 5 ℃, then carrying out centrifugal treatment to separate out salt with the solubility sensitive to temperature change and obtain a second filtrate, and converging the second filtrate into a brine storage tank used for containing divalent or multivalent brine in the second step for cyclic treatment; wherein, the outer wall surface of the second centrifugal separator is coated with heat preservation cotton;
wherein a heat source pump and a heat exchanger are connected between the second centrifugal separator and a brine storage tank for containing the divalent or multivalent brine.
Example 3.
A method for evaporating and separating salt of miscellaneous strong brine at low temperature and recovering resources comprises the following steps:
step one, detecting the conductivity of strong brine: detecting the conductivity of the strong brine;
step two, case-by-case pretreatment: in the third case, when the conductivity of the strong brine is more than 60000 mu s, the strong brine is directly evaporated and recovered by a low-temperature evaporator;
in this embodiment, the processing temperature of the low-temperature evaporator is set to 35 ℃;
step three, directly evaporating and recovering monovalent brine obtained in the first condition and the second condition of the step two through a low-temperature evaporator; placing the divalent or multivalent brine obtained in the first case and the second case of the second step into a second low-temperature evaporator; in this embodiment, the temperature of the second low-temperature evaporator is set to 35 ℃;
step four, centrifugal separation of the first centrifugal separator: centrifuging the divalent or multivalent salt water placed in the second low-temperature evaporator in the third step by using a first centrifugal separator at normal temperature to separate out salt insensitive to temperature and obtain first filtrate;
step five, the second centrifugal separator centrifugally separates: placing the first filtrate obtained in the fourth step in a second centrifugal separator at 15 ℃, then carrying out centrifugal treatment to separate out salt with the solubility sensitive to temperature change and obtain a second filtrate, and converging the second filtrate into a brine storage tank used for containing divalent or multivalent brine in the second step for cyclic treatment; wherein, the outer wall surface of the second centrifugal separator is coated with heat preservation cotton;
wherein a heat source pump and a heat exchanger are connected between the second centrifugal separator and a brine storage tank for containing the divalent or multivalent brine.
Example 4.
A method for evaporating and separating salt of miscellaneous strong brine at low temperature and recovering resources comprises the following steps:
step one, detecting the conductivity of strong brine: detecting the conductivity of the strong brine;
step two, case-by-case pretreatment: in the first case, when the conductivity of the strong brine is 10000 mus, firstly obtaining monovalent brine, bivalent or multivalent brine through NF salt separation, concentrating the monovalent brine, the bivalent or multivalent brine through DTRO treatment until the conductivity is 6-10 ten thousand mus, respectively obtaining the concentrated monovalent brine, bivalent or multivalent brine, and respectively containing the monovalent brine, bivalent or multivalent brine in a brine storage tank;
in this embodiment, the processing temperature of the low-temperature evaporator is set to 70 ℃;
step three, directly evaporating and recovering monovalent brine obtained in the first condition and the second condition of the step two through a low-temperature evaporator; placing the divalent or multivalent brine obtained in the first case and the second case of the second step into a second low-temperature evaporator; in this embodiment, the temperature of the second low-temperature evaporator is set to 70 ℃;
step four, centrifugal separation of the first centrifugal separator: centrifuging the divalent or multivalent salt water placed in the second low-temperature evaporator in the third step by using a first centrifugal separator at normal temperature to separate out salt insensitive to temperature and obtain first filtrate;
step five, the second centrifugal separator centrifugally separates: placing the first filtrate obtained in the fourth step in a second centrifugal separator at 8 ℃, then carrying out centrifugal treatment to separate out salt with the solubility sensitive to temperature change and obtain a second filtrate, and converging the second filtrate into a brine storage tank used for containing divalent or multivalent brine in the second step for cyclic treatment; wherein, the outer wall surface of the second centrifugal separator is coated with heat preservation cotton;
wherein a heat source pump and a heat exchanger are connected between the second centrifugal separator and a brine storage tank for containing the divalent or multivalent brine.
Example 5.
A method for evaporating and separating salt of miscellaneous strong brine at low temperature and recovering resources comprises the following steps:
step one, detecting the conductivity of strong brine: detecting the conductivity of the strong brine;
step two, case-by-case pretreatment: in the second case, when the conductivity of the strong brine is 40000 mu s, the strong brine is directly concentrated to the conductivity of 6 to 10 ten thousand mu s by high-pressure reverse osmosis treatment without NF salt separation to respectively obtain monovalent brine, divalent brine or multivalent brine, and the monovalent brine, the divalent brine or the multivalent brine are respectively contained in a brine storage tank;
in this embodiment, the processing temperature of the low-temperature evaporator is set to 30 ℃;
step three, directly evaporating and recovering monovalent brine obtained in the first condition and the second condition of the step two through a low-temperature evaporator; placing the divalent or multivalent brine obtained in the first case and the second case of the second step into a second low-temperature evaporator; in this embodiment, the temperature of the second low-temperature evaporator is set to 30 ℃;
step four, centrifugal separation of the first centrifugal separator: centrifuging the divalent or multivalent salt water placed in the second low-temperature evaporator in the third step by using a first centrifugal separator at normal temperature to separate out salt insensitive to temperature and obtain first filtrate;
step five, the second centrifugal separator centrifugally separates: placing the first filtrate obtained in the fourth step in a second centrifugal separator at 13 ℃, then carrying out centrifugal treatment to separate out salt with the solubility sensitive to temperature change and obtain a second filtrate, and converging the second filtrate into a brine storage tank used for containing divalent or multivalent brine in the second step for cyclic treatment; wherein, the outer wall surface of the second centrifugal separator is coated with heat preservation cotton;
wherein a heat source pump and a heat exchanger are connected between the second centrifugal separator and a brine storage tank for containing the divalent or multivalent brine.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (8)
1. A method for low-temperature evaporation, salt separation and resource recovery of miscellaneous strong brine is characterized by comprising the following steps: it comprises the following steps:
step one, detecting the conductivity of strong brine: detecting the conductivity of the strong brine;
step two, case-by-case pretreatment: in the first case, when the conductivity of the strong brine is less than 20000 mus, firstly obtaining monovalent brine, divalent brine or polyvalent brine by NF salt separation, then concentrating the monovalent brine, the divalent brine or the polyvalent brine to the conductivity of 6-10 ten thousand mus, respectively obtaining the concentrated monovalent brine, the divalent brine or the polyvalent brine, and respectively containing the monovalent brine, the divalent brine or the polyvalent brine by a brine storage tank;
in the second case, when the conductivity of the strong brine is more than 20000 mus and less than 60000 mus, the strong brine is directly concentrated to the conductivity of 6 ten thousand to 10 ten thousand mus without NF salt separation, so as to respectively obtain concentrated monovalent brine, divalent or multivalent brine, and the monovalent brine, the divalent or multivalent brine are respectively contained in a brine storage tank;
in the third case, when the conductivity of the strong brine is more than 60000 mu s, the strong brine is directly evaporated and recovered by a low-temperature evaporator;
step three, directly evaporating and recovering monovalent brine obtained in the first condition and the second condition of the step two through a low-temperature evaporator; placing the divalent or multivalent brine obtained in the first case and the second case of the second step into a second low-temperature evaporator;
step four, centrifugal separation of the first centrifugal separator: centrifuging the divalent or multivalent salt water placed in the second low-temperature evaporator in the third step by using a first centrifugal separator at normal temperature to separate out salt insensitive to temperature and obtain first filtrate;
step five, the second centrifugal separator centrifugally separates: placing the first filtrate obtained in the fourth step in a second centrifugal separator at a certain temperature, then carrying out centrifugal treatment to separate out salt with the solubility sensitive to the temperature change, obtaining a second filtrate, and converging the second filtrate into a brine storage tank used for containing divalent or multivalent brine in the second step for cyclic treatment;
wherein a heat source pump and a heat exchanger are connected between the second centrifugal separator and a brine storage tank for containing divalent or multivalent brine.
2. The method for low-temperature evaporation and salt separation and resource recovery of the hetero-concentrated brine according to claim 1, which is characterized in that: in the second step, the concentration is carried out by high-pressure reverse osmosis treatment.
3. The method for low-temperature evaporation and salt separation and resource recovery of the hetero-concentrated brine according to claim 1, which is characterized in that: in the second step, the concentration is carried out by DTRO treatment.
4. The method for low-temperature evaporation and salt separation and resource recovery of the hetero-concentrated brine according to claim 1, which is characterized in that: in the fifth step, the temperature of the second centrifugal separator is set to 5 ℃ to 15 ℃.
5. The method for low-temperature evaporation and salt separation and resource recovery of the hetero-concentrated brine according to claim 4, which is characterized in that: in the fifth step, the temperature of the second centrifugal separator is set to 10 ℃.
6. The method for low-temperature evaporation and salt separation and resource recovery of the hetero-concentrated brine according to claim 1, which is characterized in that: in the fifth step, the outer wall surface of the second centrifugal separator is coated with heat insulation cotton.
7. The method for low-temperature evaporation and salt separation and resource recovery of the hetero-concentrated brine according to claim 1, which is characterized in that: in the second step, the processing temperature of the low-temperature evaporator is set to be 35-70 ℃.
8. The method for low-temperature evaporation and salt separation and resource recovery of the hetero-concentrated brine according to claim 1, which is characterized in that: in the third step, the temperature of the second low-temperature evaporator is set to be 35-70 ℃.
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| US8603223B2 (en) * | 2009-07-20 | 2013-12-10 | National University Of Singapore | Desalination system and method |
| JP5462939B2 (en) * | 2010-05-27 | 2014-04-02 | 日立Ｇｅニュークリア・エナジー株式会社 | Power generation and seawater desalination complex plant |
| CN103241786B (en) * | 2013-05-22 | 2014-11-05 | 北京万邦达环保技术股份有限公司 | Evaporation system |
| CN106430794A (en) * | 2016-12-20 | 2017-02-22 | 大唐国际化工技术研究院有限公司 | Resourceful treatment method and treatment system for desulfuration wastewater |
| CN108726769A (en) * | 2017-04-24 | 2018-11-02 | 中国石油化工股份有限公司 | A kind of advanced treatment and reclamation method of flue gas desulfurization liquid |
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