CN212362486U - Lithium bromide refrigerating device in combined soda process soda ash production process - Google Patents
Lithium bromide refrigerating device in combined soda process soda ash production process Download PDFInfo
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- CN212362486U CN212362486U CN202021836783.4U CN202021836783U CN212362486U CN 212362486 U CN212362486 U CN 212362486U CN 202021836783 U CN202021836783 U CN 202021836783U CN 212362486 U CN212362486 U CN 212362486U
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- Prior art keywords
- lithium bromide
- refrigerant
- evaporator
- outlet
- pump
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- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 title claims abstract description 156
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 229910000029 sodium carbonate Inorganic materials 0.000 title claims abstract description 8
- 235000017550 sodium carbonate Nutrition 0.000 title claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 68
- 239000003507 refrigerant Substances 0.000 claims abstract description 57
- 239000012452 mother liquor Substances 0.000 claims abstract description 32
- 239000006096 absorbing agent Substances 0.000 claims abstract description 28
- 239000000498 cooling water Substances 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 9
- 238000005057 refrigeration Methods 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 4
- 238000002425 crystallisation Methods 0.000 abstract description 9
- 230000008025 crystallization Effects 0.000 abstract description 9
- 239000003513 alkali Substances 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 230000008014 freezing Effects 0.000 abstract 3
- 238000007710 freezing Methods 0.000 abstract 3
- 239000002826 coolant Substances 0.000 description 21
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 3
- 238000001354 calcination Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/62—Absorption based systems
Landscapes
- Sorption Type Refrigeration Machines (AREA)
Abstract
The utility model discloses a lithium bromide refrigerating device in the process of producing soda by a combined alkali method, which comprises a lithium bromide unit consisting of a generator, a heat exchanger, a concentrated solution pump, a dilute solution pump, an absorber, an evaporator, a refrigerant pump and a condenser; the utility model also discloses a method of adopting above-mentioned device to refrigerate. The original crystallization external cooler is replaced by the evaporator, the operation efficiency of the lithium bromide refrigerating device in the combined alkali method sodium carbonate production process can be improved, the heat exchange process of freezing water and the crystallization external cooler in the prior art is eliminated, the mother liquor to be cooled directly exchanges heat with the refrigerant water in the evaporator, the temperature of the mother liquor to be cooled can be reduced to 5-8 ℃, the refrigerating effect of the refrigerating device is improved, the process index of the system is optimized, the energy consumption of the system is reduced, the heat exchange process of freezing water and the crystallization external cooler is eliminated, a freezing water conveying pump is eliminated, and the power consumption is greatly saved.
Description
Technical Field
The utility model relates to a design and a combined alkali soda production process, in particular to a lithium bromide refrigerating device in the combined alkali soda production process.
Background
In the traditional lithium bromide refrigeration cooling method in the production process of the sodium carbonate,
for example, in a device and a method for cooling lithium bromide in a crystallization working section and cleaning hot ammonia I mother liquor of an external cooler in the production process of soda by a combined alkali method with the national patent publication number of CN105698427A, the working procedure of cooling liquid ammonia in an ice machine is cancelled, a lithium bromide unit is used for cooling by refrigeration, the lithium bromide unit consists of a generator E0702, an absorber E0703, a condenser E0704, an evaporator E0705 and a heat exchanger E0706, a concentrated solution pump P0703, a dilute solution pump P0704 and a refrigerant pump P0705 are configured for conveying and recycling lithium bromide solution and refrigerant water in each container, and the unit is configured with a vacuum pump for periodically pumping vacuum of the unit. And the hot water of the calcining system is sent to a lithium bromide generator E0702 by a hot water pump P0707, the dilute solution of the lithium bromide is heated to become a concentrated solution, refrigerant steam is generated at the same time, and the low-temperature water from the generator E0702 returns to the calcining system for hot water recycling. The concentrated solution is pumped to a heat exchanger E0706 through a concentrated solution pump P0703 to exchange heat with the dilute solution, the concentrated solution is sent to a lithium bromide absorber E0703 after heat exchange, refrigerant steam from an absorption evaporator E0705 becomes the dilute solution, the heat released by absorption is taken out by cooling water, the dilute solution is conveyed to the heat exchanger E0706 through a dilute solution pump P0704 to exchange heat with the concentrated solution and then to a generator E0702, and the whole circulation of the solution is completed. Refrigerant steam generated by the generator E0702 flows into the condenser E0704, is cooled by cooling water to be liquid water, water in a liquid state (namely low-temperature refrigerant water) flows back to the evaporator E0705, the refrigerant water in the evaporator E0705 is continuously supplemented, the low-temperature refrigerant water (less than 5 ℃) in the evaporator E0705 exchanges heat with the evaporator tube side refrigerating water through a refrigerant pump P0705 circulation, the temperature of the refrigerating water is reduced to about 5-6 ℃, the refrigerant steam generated by the evaporator E0705 flows into the absorber E0703 to be absorbed by dilute solution, and the whole circulation of the refrigerant water is completed. The chilled water generated by the refrigeration of the lithium bromide unit is removed from the crystallization external cooler to exchange heat with the AI mother liquor, the temperature of the AI mother liquor is reduced by less than 10 ℃, and the chilled water discharged from the external cooler is pumped to the lithium bromide unit by a chilled water pump for recycling.
The utility model has the defects that: 1. the method is characterized in that a lithium bromide unit is used for preparing low-temperature chilled water (about 5-6 ℃), the chilled water is sent to a crystallization external cooler to exchange heat with mother liquor in an external cooler pipe for cooling, the temperature of the mother liquor can only be reduced to about 10 ℃, the chilled water is used as a refrigerant medium to carry out heat and cold energy conversion, two times of indirect heat exchange are adopted, and the lithium bromide device is low in operation efficiency. 2. The amount of chilled water produced by the lithium bromide unit is large, the power consumption of the chilled water pump is high, and if 60 ten thousand tons of soda ash are produced annually, two chilled water pumps are needed to be configured for the lithium bromide device (Q =2000 m/h, P =250 KW), the power consumption is increased by =250 x 2 x 8000=400 ten thousand KWH every year.
Disclosure of Invention
The to-be-solved technical problem of the utility model is to prior art not enough, provide a but lithium bromide refrigerating plant in the soda production process of the allied soda process that the system energy consumption of reducing, reduction equipment investment cost and can improve lithium bromide solution cooling effect.
The utility model aims to solve another technical problem and provide an adopt aforementioned device to carry out cryogenic method.
The technical problem to be solved by the utility model is realized by the following technical proposal, a lithium bromide refrigerating device in the process of producing soda by a combined alkali method, which comprises a lithium bromide unit consisting of a generator, a heat exchanger, a concentrated solution pump, a dilute solution pump, an absorber, an evaporator, a refrigerant pump and a condenser;
a lithium bromide solution circulating pipeline is formed by a lithium bromide solution outlet on the generator, a high-concentration lithium bromide solution inlet of the heat exchanger, a low-concentration lithium bromide solution outlet of the heat exchanger, an inlet and an outlet of a concentrated solution pump, a lithium bromide solution inlet of the absorber, a lithium bromide solution outlet of the absorber, an inlet and an outlet of a dilute solution pump, a low-concentration lithium bromide solution inlet of the heat exchanger, a low-concentration lithium bromide outlet of the heat exchanger and a lithium bromide solution inlet on the generator which are connected in sequence;
the hot water circulating pipeline is provided with a hot water pump and can exchange heat with the interior of the generator and is used for increasing the temperature of the lithium bromide solution in the generator;
a refrigerant steam outlet on the generator, a refrigerant steam inlet on the condenser, a refrigerant water outlet on the condenser, a refrigerant water inlet on the evaporator, a refrigerant steam outlet on the evaporator and a refrigerant steam inlet on the absorber which are connected in sequence form a refrigerant water pipeline for cooling the mother liquor;
a cooling water circulation pipeline which can exchange heat with the inside of the absorber and the condenser and is used for reducing the temperature inside the absorber and the condenser;
a mother liquor conveying pipeline to be cooled, which is used for exchanging heat and reducing the temperature of the mother liquor to be cooled and is formed by an outlet end of an axial flow pump used for conveying the mother liquor to be cooled, a mother liquor inlet to be cooled on an evaporator and a mother liquor outlet to be cooled on the evaporator which are connected in sequence;
the evaporator is also connected with a refrigerant circulating pipe, and the refrigerant circulating pipe is provided with a refrigerant pump which is used for enabling the refrigerant in the evaporator to circulate in the refrigerant circulating pipe and enabling the mother liquid conveying pipeline to be cooled to be partially cooled in the evaporator.
A lithium bromide refrigerating plant in soda production process of combined soda process, its further preferred technical scheme or technical characteristic are: the two evaporators are communicated with each other through refrigerant circulating pipes.
The utility model also discloses a lithium bromide refrigeration method in allied soda process soda production process, its characteristics are, adopt above any one technical scheme allied soda process soda production process in the lithium bromide refrigerating plant refrigerate, refrigeration method: starting circulation of hot water in the hot water circulation pipeline through the hot water pump; the hot water in a circulating state heats the lithium bromide solution in the generator and improves the concentration of the lithium bromide solution, hot coolant steam generated in the process enters the condenser and is cooled by cooling water in a cooling water circulation pipeline to form coolant water, the coolant water enters the evaporator and circulates the coolant water in the evaporator through a coolant pump, the temperature of mother liquor in a mother liquor conveying pipeline to be cooled in the evaporator is reduced to 5-8 ℃, the generated coolant steam is conveyed into the absorber through a coolant steam outlet on the evaporator, the concentration of the lithium bromide solution in the absorber is reduced, circulation of coolant on the solution side is realized, and heat generated by liquefaction of the coolant steam is absorbed by the cooling water in the absorber; the lithium bromide solution with the reduced concentration is conveyed into the heat exchanger through the dilute solution pump and exchanges heat with the lithium bromide solution with higher concentration, and the lithium bromide solution after heat exchange enters the generator through the low-concentration lithium bromide outlet of the heat exchanger, so that the circulation of the lithium bromide solution in the lithium bromide solution circulation pipeline is achieved.
The beneficial technical effect of this application: the operation efficiency of a lithium bromide refrigerating device in the combined-soda-process soda ash production process can be improved by replacing the conventional crystallization external cooler with an evaporator, the heat exchange procedure of chilled water and the crystallization external cooler in the prior art is cancelled, so that the mother liquor to be cooled directly exchanges heat with refrigerant water in the evaporator, the temperature of the mother liquor to be cooled can be reduced to 5-8 ℃, the refrigerating effect of the refrigerating device is improved, the technological index of a system is optimized, and the energy consumption of the system is reduced; the process of heat exchange between chilled water and a crystallization external cooler is cancelled, a chilled water delivery pump is cancelled, and the power consumption is greatly saved, if 60 ten thousand tons of soda ash are produced annually, two chilled water pumps are required to be configured in a lithium bromide device in the traditional process (Q =2000 m/h, P =250 KW), and the power consumption is saved by 250 x 2 x 8000, namely 400 thousand KWH each year.
Drawings
Fig. 1 is a schematic structural diagram of the refrigerating apparatus of the present invention.
Detailed Description
The embodiments of the present invention will be further described with reference to the accompanying drawings so as to facilitate the further understanding of the present invention by those skilled in the art, and do not constitute a limitation to the right thereof.
Embodiment 1, referring to fig. 1, a lithium bromide refrigeration device in the process of producing soda by a combined alkali method comprises a lithium bromide unit consisting of a generator 1, a heat exchanger 2, a concentrated solution pump 3, a dilute solution pump 4, an absorber 5, an evaporator 6, a refrigerant pump 7 and a condenser 8;
a lithium bromide solution circulating pipeline is formed by a lithium bromide solution outlet on the generator 1, a high-concentration lithium bromide solution inlet on the heat exchanger 2, a low-concentration lithium bromide solution outlet on the heat exchanger 2, an inlet and an outlet of the concentrated solution pump 3, a lithium bromide solution inlet on the absorber 5, a lithium bromide solution outlet on the absorber 5, an inlet and an outlet of the dilute solution pump 4, a low-concentration lithium bromide solution inlet on the heat exchanger 2, a low-concentration lithium bromide outlet on the heat exchanger 2 and a lithium bromide solution inlet on the generator 1 which are connected in sequence;
a hot water circulating pipeline which is provided with a hot water pump and can exchange heat with the interior of the generator 1 and is used for increasing the temperature of the lithium bromide solution in the generator 1;
a refrigerant water pipeline for cooling mother liquor is formed by a refrigerant steam outlet on the generator 1, a refrigerant steam inlet on the condenser 8, a refrigerant water outlet on the condenser 8, a refrigerant water inlet on the evaporator 6, a refrigerant steam outlet on the evaporator 6 and a refrigerant steam inlet on the absorber 5 which are connected in sequence;
a cooling water circulation pipeline which can exchange heat with the inside of the absorber 5 and the condenser 8 and is used for reducing the temperature inside the absorber 5 and the condenser 8;
a mother liquor conveying pipeline to be cooled, which is used for exchanging heat and reducing the temperature of the mother liquor to be cooled and is formed by an outlet end of an axial flow pump used for conveying the mother liquor to be cooled, a mother liquor inlet to be cooled on the evaporator 6 and a mother liquor outlet to be cooled on the evaporator 6 which are connected in sequence;
the evaporator 6 is also connected with a refrigerant circulating pipe, and the refrigerant circulating pipe is provided with the refrigerant pump 7 which is used for enabling the refrigerant in the evaporator 6 to circulate in the refrigerant circulating pipe and enabling the mother liquor conveying pipeline to be cooled to be partially cooled in the evaporator 6. The heat exchanger can adopt a plate heat exchanger.
In the lithium bromide refrigeration device in the process of producing soda by the combined alkali method in the embodiment 2 and the embodiment 1, two evaporators 6 are arranged, and refrigerant circulating pipes on the two evaporators 6 are communicated.
Example 3, referring to fig. 1, a method for refrigerating by using a lithium bromide refrigerating device in the combined soda process soda production process described in example 1 or 2 comprises the following steps: hot water in the hot water circulation pipeline starts to circulate through the hot water pump, and the hot water circulation pipeline can be supplied with water by an external calcination system; the hot water in the circulating state at this time makes the concentration of the lithium bromide solution in the generator 1 increase, the hot coolant steam generated during the process enters the condenser 8 and is cooled by the cooling water in the cooling water circulation line to form coolant water, the coolant water enters the evaporator 6 and circulates the coolant water in the evaporator 6 through the coolant pump 7 and reduces the mother liquor temperature in the mother liquor conveying line to be cooled in the evaporator 6 to 5-8 ℃, the coolant water temperature in the evaporator 6 is below 5 ℃, the generated coolant steam is conveyed to the absorber 5 through the coolant steam outlet on the evaporator 6 and makes the concentration of the lithium bromide solution in the absorber 5 decrease, the circulation of the coolant on the solution side, namely the circulation on the solution side, namely the whole circulation of the coolant water in the coolant water pipe line, is realized, the heat generated by the liquefaction of the coolant steam in the condenser 8 during the process is absorbed by the cooling water in the absorber 5, a water pump can be installed on the cooling water circulation pipeline, and the water inlet end and the water outlet end of the cooling water circulation pipeline are connected to an external cooling tower, so that the circulation of cooling water in the cooling water circulation pipeline can be realized; the lithium bromide solution with the reduced concentration is conveyed into the heat exchanger 2 through the dilute solution pump 4 and exchanges heat with the lithium bromide solution with higher concentration, and the lithium bromide solution after heat exchange enters the generator 1 through the low-concentration lithium bromide outlet of the heat exchanger 2, so that the circulation of the lithium bromide solution in the lithium bromide solution circulation pipeline is achieved.
Claims (2)
1. The utility model provides a lithium bromide refrigerating plant in soda production process of soda process of antithetical couplet, its characterized in that: the device comprises a lithium bromide unit consisting of a generator, a heat exchanger, a concentrated solution pump, a dilute solution pump, an absorber, an evaporator, a refrigerant pump and a condenser;
a lithium bromide solution circulating pipeline is formed by a lithium bromide solution outlet on the generator, a high-concentration lithium bromide solution inlet of the heat exchanger, a low-concentration lithium bromide solution outlet of the heat exchanger, an inlet and an outlet of a concentrated solution pump, a lithium bromide solution inlet of the absorber, a lithium bromide solution outlet of the absorber, an inlet and an outlet of a dilute solution pump, a low-concentration lithium bromide solution inlet of the heat exchanger, a low-concentration lithium bromide outlet of the heat exchanger and a lithium bromide solution inlet on the generator which are connected in sequence;
the hot water circulating pipeline is provided with a hot water pump and can exchange heat with the interior of the generator and is used for increasing the temperature of the lithium bromide solution in the generator;
a refrigerant steam outlet on the generator, a refrigerant steam inlet on the condenser, a refrigerant water outlet on the condenser, a refrigerant water inlet on the evaporator, a refrigerant steam outlet on the evaporator and a refrigerant steam inlet on the absorber which are connected in sequence form a refrigerant water pipeline for cooling the mother liquor;
a cooling water circulation pipeline which can exchange heat with the inside of the absorber and the condenser and is used for reducing the temperature inside the absorber and the condenser;
a mother liquor conveying pipeline to be cooled, which is used for exchanging heat and reducing the temperature of the mother liquor to be cooled and is formed by an outlet end of an axial flow pump used for conveying the mother liquor to be cooled, a mother liquor inlet to be cooled on an evaporator and a mother liquor outlet to be cooled on the evaporator which are connected in sequence;
the evaporator is also connected with a refrigerant circulating pipe, and the refrigerant circulating pipe is provided with a refrigerant pump which is used for enabling the refrigerant in the evaporator to circulate in the refrigerant circulating pipe and enabling the mother liquid conveying pipeline to be cooled to be partially cooled in the evaporator.
2. The lithium bromide refrigeration device in the process of producing soda ash by the combined soda process according to claim 1, which is characterized in that: the two evaporators are communicated with each other through refrigerant circulating pipes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021836783.4U CN212362486U (en) | 2020-08-28 | 2020-08-28 | Lithium bromide refrigerating device in combined soda process soda ash production process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021836783.4U CN212362486U (en) | 2020-08-28 | 2020-08-28 | Lithium bromide refrigerating device in combined soda process soda ash production process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212362486U true CN212362486U (en) | 2021-01-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021836783.4U Active CN212362486U (en) | 2020-08-28 | 2020-08-28 | Lithium bromide refrigerating device in combined soda process soda ash production process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212362486U (en) |
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2020
- 2020-08-28 CN CN202021836783.4U patent/CN212362486U/en active Active
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