CN110921685A - Crystallization reverse material flow device and method in combined-soda-process soda ash production process - Google Patents
Crystallization reverse material flow device and method in combined-soda-process soda ash production process Download PDFInfo
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- CN110921685A CN110921685A CN201911173899.6A CN201911173899A CN110921685A CN 110921685 A CN110921685 A CN 110921685A CN 201911173899 A CN201911173899 A CN 201911173899A CN 110921685 A CN110921685 A CN 110921685A
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- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 53
- 239000000463 material Substances 0.000 title claims abstract description 40
- 238000002425 crystallisation Methods 0.000 title claims abstract description 34
- 230000008025 crystallization Effects 0.000 title claims abstract description 34
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 32
- 229910000029 sodium carbonate Inorganic materials 0.000 title claims description 18
- 235000017550 sodium carbonate Nutrition 0.000 title claims description 18
- 238000001816 cooling Methods 0.000 claims abstract description 107
- 238000000926 separation method Methods 0.000 claims abstract description 104
- 238000005185 salting out Methods 0.000 claims abstract description 45
- 239000003513 alkali Substances 0.000 claims abstract description 13
- 239000012452 mother liquor Substances 0.000 claims description 46
- 239000007788 liquid Substances 0.000 claims description 41
- 238000004140 cleaning Methods 0.000 claims description 30
- 239000013078 crystal Substances 0.000 claims description 24
- 230000008569 process Effects 0.000 claims description 23
- 239000002002 slurry Substances 0.000 claims description 23
- 238000004458 analytical method Methods 0.000 claims description 18
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 claims description 10
- 239000002562 thickening agent Substances 0.000 claims description 10
- 238000001556 precipitation Methods 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 4
- 238000005265 energy consumption Methods 0.000 abstract description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 6
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000009938 salting Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D7/00—Carbonates of sodium, potassium or alkali metals in general
- C01D7/16—Preparation from compounds of sodium or potassium with amines and carbon dioxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D9/0059—General arrangements of crystallisation plant, e.g. flow sheets
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
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- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
A crystallization reverse material flow device in the production process of soda by a combined alkali method comprises a salting-out crystallizer, a cold-out crystallizer and a pre-cooling out crystallizer, wherein the cold-out crystallizer is connected with a cold-out external cooler for circularly cooling, a heat inlet of the cold-out external cooler is communicated with the cold-out crystallizer through a cold-out feeding pipeline, and a heat outlet of the cold-out external cooler is communicated with the cold-out crystallizer through a cold-out returning pipeline; the precooling crystallizer is connected with a precooling crystallizer external cooler for circulating cooling, the heat inlet of the precooling crystallizer external cooler is communicated with the precooling crystallizer through a precooling feeding pipeline, and the heat outlet of the precooling crystallizer external cooler is communicated with the precooling crystallizer through a precooling returning pipeline; the salting-out crystallizer is communicated with a cold separation feeding pipeline and a cold separation feeding pipeline through a submerged pump. The device can greatly reduce the labor intensity of operators, improve and stabilize the cooling operation of the external cooler, save energy consumption, virtually increase the number of the external coolers in the operation, increase the heat exchange area of the external cooler and optimize the prior device.
Description
Technical Field
The invention relates to the technical field of soda production by a combined soda process, in particular to a crystallization reverse material flow device in the production process of soda by the combined soda process, and also relates to a use method of the crystallization reverse material flow device in the production process of soda by the combined soda process.
Background
Taking out the crystal slurry of the salting-out crystallizer into a salting-out thickener, taking out the crystal slurry of the salting-out thickener, conveying the crystal slurry into the pre-cooling crystallizer and the cold-precipitation crystallizer through a reverse charge pump, and not directly entering the pre-cooling crystallizer and the cold-precipitation crystallizer to serve as external coolers. The hot AI cleaning of the pre-cooling and separating external cooler and the cold separating external cooler adopts a hot AI cleaning pump, the hot AI after ammonia absorption returns to the hot AI barrel firstly, then the hot AI is conveyed to the cleaning external cooler by the hot AI cleaning pump, and the cleaned hot AI returns to the hot AI barrel.
However, this process has the following drawbacks:
1. the salting-out reverse material does not directly enter the pre-cooling crystallizer and the external cooler of which the external cooler AI mother liquor is cooled to reach an oversaturated state and then is crystallized and separated out, so that the heat exchange tube of the external cooler is scabbed and blocked, the operation period of the external cooler is short (the external cooler needs to be changed for cleaning after 8 hours in the traditional process), the stable operation of the external cooler is not facilitated, and the labor load of operators is increased;
2. the traditional material reversing process has more devices, the material reversing pipeline is long and easy to block, the environment-friendly problem caused by the treatment of the material reversing pipeline is solved, and the labor load of operators is increased;
3. the traditional hot AI cleaning process flow needs to start a hot AI cleaning pump, increases energy consumption, brings noise and environmental protection problems, and increases the labor load of operators.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a crystallization reverse material flow device in the production process of soda by a combined soda process, which can reduce the labor intensity of operators, improve and stabilize the cooling operation of an external cooler, save energy consumption and solve the problems of safety and environmental protection of the traditional process.
The invention also provides a use method of the crystallization reverse material flow device in the combined alkali method soda production process.
The technical problem to be solved by the present invention is achieved by the following technical means. The invention relates to a crystallization reverse material flow device in the production process of soda by a combined alkali method, which comprises a salting-out crystallizer, a cold-out crystallizer and a pre-cooling out crystallizer, wherein the cold-out crystallizer is connected with a cold-out external cooler for circularly cooling, the hot inlet of the cold-out external cooler is communicated with the cold-out crystallizer through a cold-out feeding pipeline, and the hot outlet of the cold-out external cooler is communicated with the cold-out crystallizer through a cold-out returning pipeline; the precooling crystallizer is connected with a precooling crystallizer external cooler for circulating cooling, the heat inlet of the precooling crystallizer external cooler is communicated with the precooling crystallizer through a precooling feeding pipeline, and the heat outlet of the precooling crystallizer external cooler is communicated with the precooling crystallizer through a precooling returning pipeline; the salting-out crystallizer is communicated with a cold separation feeding pipeline and a cold separation feeding pipeline through a submerged pump.
The technical problem to be solved by the invention can be further solved by the following technical scheme that for the crystallization reverse material flow device in the production process of the soda ash by the combined soda process, the cold separation feed pipeline and the pre-cooling separation feed pipeline are both communicated with an external hot AI mother liquor pipeline, first cleaning valves are respectively arranged at the communication positions of the cold separation feed pipeline, the pre-cooling separation feed pipeline and the external hot AI mother liquor pipeline, the cold separation return pipeline and the pre-cooling separation return pipeline are uniformly communicated with an external regenerative AI mother liquor barrel, and second cleaning valves are respectively arranged at the communication positions of the cold separation return pipeline, the pre-cooling separation return pipeline and the external regenerative AI mother liquor barrel; the height of the external hot AI mother liquor pipeline is higher than that of the cold separation external cooler and the pre-cooling separation external cooler, and the heights of the cold separation external cooler and the pre-cooling separation external cooler are higher than that of the external backheating AI mother liquor barrel; the AI mother liquor refers to the ammonia I mother liquor.
The technical problem to be solved by the invention can be further realized by the following technical scheme that for the crystallization reverse material flow device in the production process of the soda ash by the combined soda process, a cold inlet and a cold outlet of the cold separation external cooler are both communicated with a chilled water pipeline of an external lithium bromide system.
The technical problem to be solved by the invention can be further realized by the following technical scheme that for the crystallization reverse material flow device in the combined alkali method soda production process, a cold inlet of the pre-cooling external cold separator is communicated with a cold mother liquor II pipeline of an external salting-out crystallizer, and a cold outlet of the pre-cooling external cold separator is communicated with an external mother liquor II barrel.
The technical problem to be solved by the invention can be further realized by the following technical scheme that for the crystallization reverse material flow device in the production process of the soda ash by the combined alkali method, a pre-cooling analysis overflow pipe communicated with a cold analysis crystallizer is arranged on the pre-cooling analysis crystallizer, an overflow pipe communicated with a salting-out crystallizer is communicated with the cold analysis crystallizer, and an overflow pipe communicated with a pre-cooling analysis external cooler is also arranged on the salting-out crystallizer.
The technical problem to be solved by the invention can be further realized by the following technical scheme that for the crystallization reverse material flow device in the combined soda production process, the pre-cooling crystallizer is communicated with a cold AI mother liquor pipeline of an external mother exchange system.
The technical problem to be solved by the invention can be further realized by the following technical scheme that for the crystallization reverse material flow device in the production process of the soda ash by the combined soda process, the crystal slurry taking-out port of the cold separation crystallizer is communicated with an external cold separation thickener, and the crystal slurry taking-out port of the cold separation crystallizer is communicated with the cold separation crystallizer.
The technical problem to be solved by the invention can be further realized by the following technical scheme that for the crystallization reverse material flow device in the production process of the soda ash by the combined alkali method, a plurality of submerged pumps communicated with a cold-separation feeding pipeline and a plurality of submerged pumps communicated with a cold-separation feeding pipeline are arranged in the salting-out crystallizer.
The technical problem to be solved by the invention can be further realized by the following technical scheme, and for the crystallization reverse material flow device in the production process of the combined alkali soda ash, the crystallization reverse material flow method in the production process of the combined alkali soda ash comprises the following steps:
(1) when the cold AI liquid is used, the external mother exchange system inputs the cold AI liquid into the pre-cooling crystallizer, the clear liquid in the pre-cooling crystallizer overflows to the cold crystallizer, the clear liquid in the cold crystallizer overflows to the salting-out crystallizer, the cold-separating external cooler circularly cools the mother liquid in the cold crystallizer, the pre-cooling external cooler circularly cools the mother liquid in the pre-cooling crystallizer, meanwhile, a submerged pump inputs the crystal slurry in the salting-out crystallizer into the cold-separating external cooler and the pre-cooling external cooler, the mother liquid cooled by the cold-separating external cooler is input into the cold crystallizer, and the mother liquid cooled by the pre-cooling external cooler is input into the pre-cooling crystallizer; finally, taking out the crystal slurry precipitated from the pre-cooling crystallizer to a cold crystallizer, and taking out the crystal slurry precipitated from the cold crystallizer to an external cold-precipitation thickener;
(2) when the cleaning device is used for cleaning, the first cleaning valve and the second cleaning valve are opened, hot AI mother liquor in the external hot AI mother liquor pipeline directly flows into the cold separation external cooler and the pre-cooling separation external cooler by utilizing the height difference, the cold separation external cooler and the pre-cooling separation external cooler are cleaned, and the cleaned hot AI mother liquor returns to the hot AI mother liquor barrel under the action of the height difference.
Compared with the prior art, the invention provides a novel device and a novel method for the crystallization reversed material flow in the production process of soda by a combined alkali method, which innovatively adjusts the crystallization reversed material flow in the production process of soda by the combined alkali method, and the key technology is that the top of a salting-out crystallizer is directly pumped out by using an underwater pump, and the reversed material of the salting-out crystallizer is directly pumped into a pre-cooling crystallizer and a cold-separating crystallizer to serve as an external cooler, so that the operation period of the external cooler is prolonged to more than 24 hours, and even the continuous operation of the external cooler can be realized without changing vehicles; meanwhile, a traditional process hot AI cleaning pump is cancelled, the hot AI after ammonia absorption directly flows into the cleaning external cooler by utilizing the height difference, and the cleaned hot AI returns to the hot AI barrel by utilizing the height difference, so that the energy consumption is saved, and the noise and environmental protection problems are solved. The device can greatly reduce the labor intensity of operators, improve and stabilize the cooling operation of the external cooler, save energy consumption, solve the problems of safety, environmental protection and the like of the traditional process, and increase the number of the external coolers in operation virtually, increase the heat exchange area of the external cooler, and optimize the existing device.
Drawings
FIG. 1 is a schematic diagram of a structure of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a crystallization reverse-material flow device in the production process of soda by a combined alkali method comprises a salting-out crystallizer 3, a cold-out crystallizer 2 and a pre-cooling out crystallizer 1, wherein the cold-out crystallizer 2 is connected with a cold-out external cooler 6 for circularly cooling, a hot inlet of the cold-out external cooler 6 is communicated with the cold-out crystallizer 2 through a cold-out feeding pipeline, a hot outlet of the cold-out external cooler 6 is communicated with the cold-out crystallizer 2 through a cold-out returning pipeline, and the cold-out crystallizer 2 is provided with a cold-out axial-flow pump 5 matched with the cold-out feeding pipeline and used for outputting crystal slurry in the cold-out crystallizer 2 to the cold-out feeding pipeline; the cold separation feed back pipeline can be also communicated with a cold separation collecting tank 9 for playing a role of buffering; the precooling crystallizer 1 is connected with a precooling crystallizer external cooler 8 for circular cooling, a heat inlet of the precooling crystallizer external cooler 8 is communicated with the precooling crystallizer 1 through a precooling feeding pipeline, a heat outlet of the precooling crystallizer external cooler 8 is communicated with the precooling crystallizer 1 through a precooling feeding pipeline, and a precooling axial-flow pump 7 matched with the precooling feeding pipeline is arranged on the precooling crystallizer 1 and used for outputting crystal slurry in the precooling crystallizer 1 to the precooling feeding pipeline; the precooling separation and collection tank 10 can be communicated with the precooling separation and return pipeline and is used for playing a role of buffering; the salting-out crystallizer 3 is communicated with a cold separation feeding pipeline and a pre-cooling separation feeding pipeline through a submerged pump 4 and is used for pumping the crystal mush reverse material in the salting-out crystallizer 3 into the cold separation external cooler 6 and the pre-cooling separation external cooler 8, so that the AI mother liquor cooled by the cold separation external cooler 6 and the pre-cooling separation external cooler 8 still does not reach a supersaturated state, and the blockage of the cold separation external cooler 6 and the pre-cooling separation external cooler 8 is avoided; the submerged pump 4 is fixedly installed on the top of the salting-out crystallizer 3.
The cold separation feed pipeline and the pre-cooling separation feed pipeline are both communicated with an external hot AI mother liquor pipeline, first cleaning valves 12 are respectively arranged at the communication positions of the cold separation feed pipeline, the pre-cooling separation feed pipeline and the external hot AI mother liquor pipeline, the cold separation return pipeline and the pre-cooling separation return pipeline are uniformly communicated with an external backheating AI mother liquor barrel, and second cleaning valves 11 are respectively arranged at the communication positions of the cold separation return pipeline, the pre-cooling separation return pipeline and the external backheating AI mother liquor barrel; the height of the external hot AI mother liquor pipeline is higher than that of the cold separation external cooler 6 and the pre-cooling separation external cooler 8, so that a height difference is convenient to form, and the hot AI mother liquor in the external hot AI mother liquor pipeline automatically enters a cold separation feeding pipeline and a pre-cooling separation feeding pipeline under the action of gravity, then enters the cold separation external cooler 6 and the pre-cooling separation external cooler 8, and the cold separation external cooler 6 and the pre-cooling separation external cooler 8 are cleaned; the heights of the cold separating external cooler 6 and the cold separating external cooler 8 are higher than that of the external backheating AI mother liquid barrel, so that a height difference is convenient to form, hot AI mother liquid entering the cold separating external cooler 6 and the cold separating external cooler 8 automatically flows out, and the hot AI mother liquid is stored in the external backheating AI mother liquid barrel in a centralized mode.
The cold import and the cold export of cold outer cooler 6 of separating all communicate with the refrigerated water pipeline of outside lithium bromide system for the refrigerated water of the refrigerated water pipeline of outside lithium bromide system flows through cold outer cooler 6 of separating, thereby can utilize the refrigerated water of the refrigerated water pipeline of outside lithium bromide system to carry out the heat exchange to the mother liquor that flows through cold outer cooler 6 of separating, realize the cooling of mother liquor.
The cold inlet of the external precooling and salting-out cooler 8 is communicated with a cold mother liquid II pipeline of the external salting-out crystallizer 3, and the cold outlet of the external precooling and salting-out cooler 8 is communicated with an external mother liquid II barrel, so that the cold mother liquid II of the cold mother liquid pipeline of the external salting-out crystallizer 3 flows through the external salting-out cooler 8, and the cold mother liquid II of the cold mother liquid pipeline of the external salting-out crystallizer 3 can be utilized to exchange heat with the mother liquid flowing through the external salting-out cooler 8, thereby realizing the cooling and cooling of the mother liquid.
The pre-cooling crystallizer 1 is provided with a pre-cooling analysis overflow pipe communicated with the pre-cooling crystallizer 2, so that clear liquid in the pre-cooling crystallizer 1 can overflow into the pre-cooling crystallizer 2 conveniently, the pre-cooling crystallizer 2 is communicated with an overflow pipe communicated with the salting-out crystallizer 3, so that the clear liquid in the pre-cooling crystallizer 2 can overflow into the salting-out crystallizer 3 conveniently, the salting-out crystallizer 3 is also provided with an overflow pipe communicated with the pre-cooling analysis external cooler 8, so that the clear liquid in the salting-out crystallizer 3 can overflow into the pre-cooling analysis external cooler 8 conveniently, and after heat exchange, an external mother liquid II barrel is returned.
The precooling crystallizer 1 is communicated with a cold AI mother liquor pipeline of an external mother exchange system and is used for feeding, and input cold AI mother liquor firstly enters the precooling crystallizer 1, then enters the precooling crystallizer 2 and the salting crystallizer 3, then enters the precooling external cooler 8, exchanges heat through the precooling external cooler 8 and then is output to an external mother liquor II bucket.
The crystal slurry taking-out port of the cold separation crystallizer 2 is communicated with an external cold separation thickener and is used for discharging, and the crystal slurry in the cold separation crystallizer 2 is output through the crystal slurry taking-out port and then is sent into the external cold separation thickener for continuous treatment; the crystal slurry taking-out port of the pre-cooling crystallizer 1 is communicated with the cooling crystallizer 2 and is output by the crystal slurry taking-out port of the cooling crystallizer 2.
A plurality of submerged pumps 4 communicated with cold separation feed pipelines and a plurality of submerged pumps 4 communicated with the cold separation feed pipelines are arranged in the salting-out crystallizer 3, so that the cold separation feed pipeline of each cold separation external cooler 6 corresponds to one submerged pump 4, the feeding of each cold separation external cooler 6 is uniform, and the cold separation external cooler 6 is convenient to change vehicles; and ensuring that the pre-cooling analysis feed pipeline of each pre-cooling analysis external cooler 8 corresponds to one submerged pump 4 so as to ensure that each pre-cooling analysis external cooler 8 can feed uniformly, and switching by using the pre-cooling analysis external cooler 8.
A crystallization reverse material flow method in the production process of soda by a combined soda process comprises the following steps:
(1) when the cold-separation crystallizer is used, the external mother exchange system inputs cold AI liquid into the pre-cooling separation crystallizer 1, clear liquid in the pre-cooling separation crystallizer 1 overflows to the cold-separation crystallizer 2, clear liquid in the cold-separation crystallizer 2 overflows to the salting-out crystallizer 3, the cold-separation external cooler 6 circularly cools mother liquid in the cold-separation crystallizer 2, the pre-cooling separation external cooler 8 circularly cools the mother liquid in the pre-cooling separation crystallizer 1, meanwhile, the submerged pump 4 inputs crystal slurry in the salting-out crystallizer 3 into the cold-separation external cooler 6 and the pre-cooling separation external cooler 8, the mother liquid cooled by the cold-separation external cooler 6 is input into the cold-separation crystallizer 2, and the mother liquid cooled by the pre-cooling separation external cooler 8 is input into the pre-cooling separation crystallizer 1; finally, taking out the crystal slurry precipitated from the pre-cooling crystallizer 1 to a cold crystallizer 2, and taking out the crystal slurry precipitated from the cold crystallizer 2 to an external cold-precipitation thickener;
(2) during cleaning, the first cleaning valve 12 and the second cleaning valve 11 are opened, hot AI mother liquor in the external hot AI mother liquor pipeline directly flows into the cold separation external cooler 6 and the pre-cooling separation external cooler 8 by utilizing the height difference to clean the cold separation external cooler 6 and the pre-cooling separation external cooler 8, and the cleaned hot AI mother liquor returns to the hot AI mother liquor barrel under the action of the height difference.
The invention has the following advantages:
1. the method is characterized in that the salting-out crystallization reverse material is directly pumped out to the external cooler of the pre-cooling crystallizer and the operation of the cold crystallizer by using a submerged pump, so that the AI mother liquor in the external cooler is not in a supersaturated state after being cooled, the problem that the heat exchange tube of the external cooler is scabbed and blocked due to crystallization separation when the AI mother liquor of the external cooler reaches the supersaturated state after being cooled in the traditional process is solved, the operation period of the external cooler is prolonged to more than 24 hours, even, the continuous operation of the external cooler is realized without changing a vehicle, the number of the external coolers in operation is increased invisibly, the heat exchange area of the external cooler is increased, the existing device is optimized, in addition, the labor intensity of operators can be greatly reduced, and the cooling operation of the external cooler is.
2. The traditional process salting-out crystallization reverse material flow is cancelled, devices such as a salting-out thickener and a reverse material pump are cancelled, the labor load of operators is reduced, and the problems of safety and environmental protection caused by more devices, long pipelines and easy blockage in the traditional process are solved.
3. A traditional process heat AI cleaning pump is cancelled, so that the energy consumption is saved, the noise and environmental protection problems are solved, and the labor load of operators is reduced; according to 60 ten thousand tons of soda ash produced annually, three hot AI cleaning pumps (Q =600 m/H, H =35m, P =132 KW) are needed for cleaning the external cooler hot AI of the pre-cooling analysis system and the cold analysis system, and by adopting the process disclosed by the invention, the electric quantity can be saved by 132 x 3 x 8000=316.8 ten thousand kwh each year by taking the heat-eliminating AI cleaning pump.
Claims (9)
1. The utility model provides a crystallization contrary material flow device in soda production process of soda process of alling oneself with alkali method which characterized in that: the device comprises a salting-out crystallizer, a cold-out crystallizer and a pre-cold-out crystallizer, wherein the cold-out crystallizer is connected with a cold-out external cooler for circularly cooling, a hot inlet of the cold-out external cooler is communicated with the cold-out crystallizer through a cold-out feeding pipeline, and a hot outlet of the cold-out external cooler is communicated with the cold-out crystallizer through a cold-out returning pipeline; the precooling crystallizer is connected with a precooling crystallizer external cooler for circulating cooling, the heat inlet of the precooling crystallizer external cooler is communicated with the precooling crystallizer through a precooling feeding pipeline, and the heat outlet of the precooling crystallizer external cooler is communicated with the precooling crystallizer through a precooling returning pipeline; the salting-out crystallizer is communicated with a cold separation feeding pipeline and a cold separation feeding pipeline through a submerged pump.
2. The crystallization reverse material flow device in the combined soda ash method production process according to claim 1, which is characterized in that: the cold separation feed pipeline and the pre-cooling separation feed pipeline are both communicated with an external hot AI mother liquor pipeline, first cleaning valves are respectively arranged at the communication positions of the cold separation feed pipeline, the pre-cooling separation feed pipeline and the external hot AI mother liquor pipeline, the cold separation return pipeline and the pre-cooling separation return pipeline are uniformly communicated with an external backheating AI mother liquor barrel, and second cleaning valves are respectively arranged at the communication positions of the cold separation return pipeline, the pre-cooling separation return pipeline and the external backheating AI mother liquor barrel; the height of the external hot AI mother liquor pipeline is higher than that of the cold separation external cooler and the pre-cooling separation external cooler, and the heights of the cold separation external cooler and the pre-cooling separation external cooler are higher than that of the external backheating AI mother liquor barrel.
3. The crystallization reverse material flow device in the combined soda ash method production process according to claim 1, which is characterized in that: and a cold inlet and a cold outlet of the cold separating external cooler are both communicated with a chilled water pipeline of an external lithium bromide system.
4. The crystallization reverse material flow device in the combined soda ash method production process according to claim 1, which is characterized in that: and a cold inlet of the pre-cooling and separating external cooler is communicated with a cold mother II liquid pipeline of the external salting-out crystallizer, and a cold outlet of the pre-cooling and separating external cooler is communicated with an external mother II liquid barrel.
5. The crystallization reverse material flow device in the combined soda ash method production process according to claim 1, which is characterized in that: the pre-cooling crystallizer is provided with a pre-cooling analysis overflow pipe communicated with the cold analysis crystallizer, the cold analysis crystallizer is communicated with an overflow pipe communicated with the salting-out crystallizer, and the salting-out crystallizer is also provided with an overflow pipe communicated with a pre-cooling analysis external cooler.
6. The crystallization reverse material flow device in the combined soda ash method production process according to claim 1, which is characterized in that: the pre-cooling crystallizer is communicated with a cold AI mother liquor pipeline of an external mother exchange system.
7. The crystallization reverse material flow device in the combined soda ash method production process according to claim 1, which is characterized in that: and a crystal slurry taking-out port of the cold precipitation crystallizer is communicated with an external cold precipitation thickener, and a crystal slurry taking-out port of the cold precipitation crystallizer is communicated with the cold precipitation crystallizer.
8. The crystallization reverse material flow device in the combined soda ash method production process according to claim 1, which is characterized in that: and a plurality of submerged pumps communicated with the cold separation feeding pipeline are arranged in the salting-out crystallizer.
9. A crystallization reverse material flow method in the production process of soda by a combined soda process is characterized in that: the method uses a crystallization reverse material flow device in the combined alkali method sodium carbonate production process according to any one of claims 1 to 8, and the process is as follows:
(1) when the cold AI liquid is used, the external mother exchange system inputs the cold AI liquid into the pre-cooling crystallizer, the clear liquid in the pre-cooling crystallizer overflows to the cold crystallizer, the clear liquid in the cold crystallizer overflows to the salting-out crystallizer, the cold-separating external cooler circularly cools the mother liquid in the cold crystallizer, the pre-cooling external cooler circularly cools the mother liquid in the pre-cooling crystallizer, meanwhile, a submerged pump inputs the crystal slurry in the salting-out crystallizer into the cold-separating external cooler and the pre-cooling external cooler, the mother liquid cooled by the cold-separating external cooler is input into the cold crystallizer, and the mother liquid cooled by the pre-cooling external cooler is input into the pre-cooling crystallizer; finally, taking out the crystal slurry precipitated from the pre-cooling crystallizer to a cold crystallizer, and taking out the crystal slurry precipitated from the cold crystallizer to an external cold-precipitation thickener;
(2) when the cleaning device is used for cleaning, the first cleaning valve and the second cleaning valve are opened, hot AI mother liquor in the external hot AI mother liquor pipeline directly flows into the cold separation external cooler and the pre-cooling separation external cooler by utilizing the height difference, the cold separation external cooler and the pre-cooling separation external cooler are cleaned, and the cleaned hot AI mother liquor returns to the hot AI mother liquor barrel under the action of the height difference.
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| CN201911173899.6A CN110921685A (en) | 2019-11-26 | 2019-11-26 | Crystallization reverse material flow device and method in combined-soda-process soda ash production process |
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| CN201911173899.6A CN110921685A (en) | 2019-11-26 | 2019-11-26 | Crystallization reverse material flow device and method in combined-soda-process soda ash production process |
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