CN111943231A - Energy-saving salt solarizing system and salt solarizing method applying same - Google Patents
Energy-saving salt solarizing system and salt solarizing method applying same Download PDFInfo
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- CN111943231A CN111943231A CN202010809106.1A CN202010809106A CN111943231A CN 111943231 A CN111943231 A CN 111943231A CN 202010809106 A CN202010809106 A CN 202010809106A CN 111943231 A CN111943231 A CN 111943231A
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- 150000003839 salts Chemical class 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 34
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims abstract description 142
- 239000012267 brine Substances 0.000 claims abstract description 132
- 239000007788 liquid Substances 0.000 claims abstract description 103
- 238000002425 crystallisation Methods 0.000 claims abstract description 74
- 230000008025 crystallization Effects 0.000 claims abstract description 74
- 238000000926 separation method Methods 0.000 claims abstract description 47
- 238000001704 evaporation Methods 0.000 claims abstract description 36
- 230000008020 evaporation Effects 0.000 claims abstract description 35
- 238000009826 distribution Methods 0.000 claims abstract description 32
- 239000011552 falling film Substances 0.000 claims abstract description 14
- 239000012452 mother liquor Substances 0.000 claims description 54
- 239000013078 crystal Substances 0.000 claims description 47
- 239000007787 solid Substances 0.000 claims description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 238000001035 drying Methods 0.000 claims description 13
- 238000012360 testing method Methods 0.000 claims description 13
- 230000007246 mechanism Effects 0.000 claims description 12
- 238000005086 pumping Methods 0.000 claims description 10
- 230000007306 turnover Effects 0.000 claims description 8
- 229920006395 saturated elastomer Polymers 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 5
- 238000003860 storage Methods 0.000 claims description 5
- 239000010408 film Substances 0.000 claims description 2
- 238000004062 sedimentation Methods 0.000 claims description 2
- 230000003760 hair shine Effects 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 238000001556 precipitation Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 7
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Inorganic materials [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 5
- 235000010333 potassium nitrate Nutrition 0.000 description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 229910002651 NO3 Inorganic materials 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000000875 corresponding effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000010790 dilution Methods 0.000 description 3
- 239000012895 dilution Substances 0.000 description 3
- 238000003306 harvesting Methods 0.000 description 3
- 241001131796 Botaurus stellaris Species 0.000 description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 238000007726 management method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- -1 salt nitrate Chemical class 0.000 description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 description 2
- 235000011152 sodium sulphate Nutrition 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 206010063385 Intellectualisation Diseases 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000036039 immunity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/04—Chlorides
- C01D3/06—Preparation by working up brines; seawater or spent lyes
Abstract
The invention relates to the field of environmental protection, energy conservation and salt chemical industry, in particular to an energy-saving salt sunning system and a salt sunning method using the same. The slope crystallization system below be provided with the brine buffer tank that the evaporation pond is linked together, brine buffer tank is in with the setting the brine distribution system at slope crystallization system top is connected. The nearly saturated brine in the salt pond is lifted and distributed to the top of the slope, so that falling film is formed in the process that the brine flows up and down the slope and is quickly evaporated and crystallized, and high-purity salt is obtained through precipitation in a slope bottom solid-liquid separation system and can be automatically transmitted to an external device. The method can provide a larger interface for exchanging energy and substances between the brine and the air through the slope crystallization system, so that the brine can quickly reach the temperature of the environment or the surface of the slope, and the evaporation effect is greatly improved compared with that in a crystallization tank.
Description
Technical Field
The invention relates to the field of environmental protection, energy conservation and salt chemical industry, in particular to an energy-saving salt sunning system and a salt sunning method using the same.
Background
The traditional saltpeter industry mostly adopts salt ponds to evaporate and crystallize, and is characterized in that brine in the crystallizing pond has certain depth, so that energy obtained (or emitted) through the environment is diluted by a large amount of brine, the overall temperature change of the brine is small, salt separated by evaporation at the average temperature is too thin to be harvested in the same year, and the salt sunning efficiency is limited. Because the open-air brine ponds can be harvested after years of accumulation, the open-air brine ponds are also polluted by rainwater and sand wind, so that the salt drying efficiency is further reduced, and a certain amount of sand and dust are mixed in the products. In addition, because the product crystals are uniformly scattered at the bottom of a wide crystallization tank, a large-scale mechanical push shovel is required to be used for concentration during harvesting or salt fishing operation, and the product pollution risk and the harvesting cost are further increased.
Through search, pengxue et al, light international engineering limited company, china, discloses in the invention patent with application number CN 201811472718.5: the invention discloses a process for producing saltpeter by evaporating saltpeter system brine, and provides a device for carrying out evaporation separation operation on saltpeter brine by taking the saltpeter system brine as a raw material and utilizing different evaporation devices and a process method using the device. However, the invention needs more process steps and corresponding devices, the operation flow needs to consume steam, the larger industrial production energy correspondingly needs larger device structure and larger energy consumption, the unit economic value of the produced main and auxiliary products is not too high, the possibility of large-scale quantitative production is restricted in industrial practical application, and the economic risk of the actual industrial production is improved. Therefore, the mature industrial market puts forward the actual demands for large-scale processing of mass production raw materials, reduction of various related costs, reduction of energy consumption in the process flow by utilizing natural force and more automatic and intelligent completion of industrial quantitative production in the field of salt and sodium sulfate production.
Disclosure of Invention
Aiming at the problems of large starting energy consumption and low economic benefit of the process method, the invention provides an energy-saving salt drying method.
In order to solve the technical problems, the invention adopts the technical scheme that: an energy-saving salt sunning system and a salt sunning method using the same comprise an energy-saving salt sunning system, wherein the energy-saving salt sunning system comprises an evaporation tank, a brine buffer tank, a slope crystallization system and a solid-liquid separation system for separating mother liquor and crystals output by the slope crystallization system, the brine buffer tank is positioned below the slope crystallization system and communicated with the evaporation tank, the brine buffer tank is connected with a brine distribution system arranged at the top of the slope crystallization system through a pipeline, and the solid-liquid separation system is positioned at the bottom of the slope crystallization system;
in this technical scheme, the brine buffer tank is located under the sloping plate subassembly of slope crystallization system covers, the rainwater dilutes valuable saturated brine liquid when can avoiding raining, saturated brine in the brine buffer tank passes through the even spread of intercommunication pipeline at slope crystallization system slope top, brine takes place the energy exchange with the air at the decline in-process, salt crystallization is constantly appeared in the supersaturation, salt crystallization and mother liquor are collected in the solid-liquid separation system of slope bottom and are assembled, solid-liquid separation system carries out automatic the transport of salt crystallization to outside output device after the solid-liquid separation operation, utilize the natural force in order to improve the speed of brine crystallization through slope crystallization system make full use of, the industrial demand of the high-efficient environmental protection of scale low cost is shone salt has been realized.
Preferably, the brine distribution system comprises a brine lift pump, a brine conveying pipeline and a water distribution pipe positioned at the top of the slope crystallization system, the water distribution pipe is connected with the brine buffer tank through the brine conveying pipeline, and directional spray holes or slits are arranged on the water distribution pipe; the brine lift pump conveys brine in the brine buffer tank to the water distribution pipe through a brine conveying pipeline, and the brine flows out of the water distribution pipe through the spray holes or the slits. In this technical scheme, brine buffer tank passes through brine pipeline and carries brine to the water distributor at slope crystallization device top, and through the even distribution of water distributor, brine can flow down along the slope surface, forms the falling film, and through the setting of water distributor, the speed that makes brine flow down at the slope top is freely controllable, optimizes crystallization rate, crystallization particle diameter, the smooth and easy nature of crystal and mother liquor time down to and the balance between the energy consumption.
Preferably, slope crystallization system includes the support and installs a plurality of swash plate assembly on the support, the swash plate assembly adopts ventilation structure design, the swash plate assembly includes the swash plate of a plurality of ladder settings and connects the bottom plate of a plurality of swash plates. In this technical scheme, the swash plate subassembly of different gradients is formed on multichannel horizontal beam and the swash plate messenger slope crystallization device surface that erects, and brine can trickle down in proper order in the swash plate subassembly of co-altitude not, and the clearance between the swash plate subassembly makes the air freely circulate around the swash plate, has further strengthened brine and the energy exchange of air when the swash plate subassembly trickles down, has improved the efficiency of evaporation and crystallization. Each inclined plate is longitudinally provided with a plurality of horizontal steps so that the brine flows down to generate turbulent flow, and the energy exchange between the brine and the air is further enhanced.
Preferably, the solid-liquid separation system comprises a collecting tank arranged at the bottom of an upper inclined plate of the slope crystallization system and a solid-liquid separation tank arranged at the bottom of the collecting tank. In the technical scheme, the collecting tank arranged at the bottom of the slope crystallization system can automatically collect and gather the liquid and crystals falling from the whole slope and automatically guide the liquid and crystals into the solid-liquid collecting tank, so that the automation of related operation is realized.
Preferably, the collecting tank comprises a solid-liquid collecting tank, a rainwater collecting tank, an inclined fine net and a testing device for detecting the conductivity of the mother liquor, a flow guide plate turnover device for guiding the mother liquor into the solid-liquid collecting tank or the rainwater collecting tank is arranged between the solid-liquid collecting tank and the rainwater collecting tank, and the flow guide plate turnover device is electrically connected with the testing device; the solid-liquid collecting tank is provided with a solid-liquid collecting tank outlet, and the rainwater collecting tank is provided with a rainwater pipeline communicated with an external drainage system. In this technical scheme, be provided with rainwater collecting vat and solid-liquid collecting vat in the collecting vat, the solid-liquid collecting vat is provided with the solid-liquid collecting vat export, and the rainwater collecting vat is provided with rainwater pipeline, can derive crystallization bittern and rainwater respectively, solves the dilution pollution problem of rainwater to the bittern pool.
Preferably, the diversion flap device comprises a flap motor arranged on the collecting tank, a flap mechanism arranged on an output shaft of the flap motor, and a diversion flap fixedly connected with the flap mechanism, and the diversion flap is arranged below the inclined fine net and between the solid-liquid collecting tank and the rainwater collecting tank; the turning plate motor is electrically connected with the testing device. The testing device comprises a liquid collecting tray arranged between the inclined fine net and the flow guide turning plate, a conductivity sensor arranged in the liquid collecting tray and a controller electrically connected with the conductivity sensor, wherein the controller is electrically connected with the turning plate motor. In the technical scheme, a conductivity sensor in the liquid collection tray conducts conductivity induction on liquid which penetrates through an inclined fine net to filter out solid crystals, the flap motor is controlled through a controller according to induction results, a flap mechanism in the diversion flap device is controlled to conduct corresponding actions, rainwater with too low brine concentration is guided into a rainwater collection tank, an external channel is guided out through a rainwater pipeline, a solid-liquid mixture with normal brine concentration is guided into a solid-liquid collection tank, and the solid-liquid mixture is guided into a solid-liquid separation tank through a solid-liquid collection tank outlet, and meanwhile the inclined fine net can ensure that the solid crystals are collected in the solid-liquid collection tank under different conditions. Through the guide function of the plate turning mechanism, the slope crystallization and solid-liquid separation system can automatically perform corresponding adjustment on different weather or other conditions, so that the automatic operation of the whole mechanism is realized, manpower is liberated, and a foundation is laid for industrial practical application.
Preferably, be provided with the overflow weir in the solid-liquid separation groove, the overflow weir will the solid-liquid separation groove is separated for solid sedimentation tank and mother liquor buffer pool, be provided with first level sensor in the mother liquor buffer pool, mother liquor pump and the mother liquor pump sending pipeline that is connected with the brine buffer pool. In the technical scheme, the solid settling tank automatically guides the mother liquor into a mother liquor buffer tank through the arrangement of an overflow weir structure, so that the automatic separation of the mother liquor and sodium sulfate crystals is completed; on the other hand, the mother liquor pump is controlled to start and stop through the first liquid level sensor, mother liquor in the mother liquor buffer pool is automatically transferred to the brine buffer pool through the pumping pipeline, the maximum development rate of brine and the utilization treatment of the mother liquor are guaranteed through circulating crystallization, and the automatic operation of the process flow is realized.
Preferably, a solid lifting device is arranged in the solid settling tank, one end of the solid lifting device is positioned at the bottom of the solid settling tank, and the other end of the solid lifting device is connected with an external solid conveying device. In this technical scheme, thereby solid promotes conveyor and passes through its inside helical structure of drive arrangement drive and rotates and carry solid material from one end to the other end, promotes the salt crystallization of bottom in the solid settling basin in time through solid promotes conveyor and carries to the loading outside the solid settling basin or transport the product storage yard through other transport machinery, has realized the automatic operation of high efficiency of process flow.
Preferably, the bottom and the inner side of the evaporation pool are provided with anti-leakage mulching films, and the top of the slope crystallization system is provided with an air temperature sensor, a humidity sensor and a light intensity sensor for detecting weather conditions; and a second liquid level sensor is arranged in the brine buffer tank. In the technical scheme, the brine buffer tanks are arranged, so that the proportioning regulation and control can be performed among brine evaporation tanks with different sources and different concentrations, and the crystallization efficiency of brine in the subsequent slope falling film crystallization operation is ensured by monitoring and reasonably calling the baume degree of the brine in each evaporation tank; the temperature sensor, the humidity sensor and the illuminance sensor at the top of the slope crystallization system can monitor weather conditions, so that a brine pumping distribution system is regulated and controlled, the pumping speed of a brine pump is properly regulated and controlled, the crystallization effect of brine crystallization operation is improved, and different weather conditions are met; a second liquid level sensor in the brine buffer tank can judge the brine liquid level, so that the brine pump and the mother liquid pump are controlled, and the automatic control of the whole brine crystallization and salt drying process is realized.
The invention provides a salt sun-drying method based on the salt sun-drying system, which comprises the following process steps:
s1: introducing or pumping salt-containing brine into an evaporation pond;
s2: when the brine in the evaporation tank is saturated, transferring the saturated brine in the evaporation tank to a brine buffer tank, and if no brine in the evaporation tank is saturated, firstly calling the brine in the evaporation tank with the highest baume degree to be pumped into the brine buffer tank;
s3: when the weather conditions are suitable for evaporation, brine is pumped from the brine buffer tank to the top of the slope crystallization system through the brine distribution system, and flows down along the inclined surface to form a falling film, so that the falling film is continuously evaporated to reach supersaturation, and salt component crystals are continuously separated out and grow up;
s4: the mother liquor with the separated crystals rolls down the inclined plane of the slope crystallization system, the crystals are transported into a slope bottom solid-liquid separation system, and the crystals are separated from the mother liquor;
s5: when enough salt crystals are accumulated in the solid-liquid separation system, the salt crystals are timely lifted and conveyed to the outside of the solid separation system in the solid separation system for loading or are conveyed to a salt storage yard through a conveying machine;
in the technical scheme, the brine buffer tank is arranged under the inclined plate component of the inclined slope crystallization system, can avoid the dilution of brine by rainwater in rainy days, the saturated brine in the brine buffer tank is uniformly spread on the top of the slope through the communicating pipeline, and flows down along the surface of the slope to form a falling film, brine is subjected to energy exchange with air in the descending process, salt crystals are supersaturated and continuously separated out, the salt crystals are transported to a solid-liquid separation system at the bottom of the slope along with mother liquor to be collected and converged, the solid-liquid separation system automatically conveys the salt crystals to an external output device after carrying out solid-liquid separation operation, and the mother liquor is led into the brine buffer tank for cyclic crystallization again, the slope crystallization and solid-liquid separation system realizes efficient automatic crystallization operation of brine through simple structural design, makes full use of natural force to improve the brine crystallization rate, and realizes industrial appeal of large-scale, low-cost, efficient and environment-friendly salt drying. Overall, the invention has the following advantages:
1. through the combination of energy exchange and a crystallization inclined plate, brine forms a uniform falling film on the surface of the brine, a larger interface is provided for the most effective energy and material exchange between the brine and air, the brine rapidly reaches the temperature of the environment or the surface of a slope, and the evaporation effect is greatly improved compared with that in a crystallization tank;
2. on the combination of the energy exchange and the crystallization inclined plate, the gas and liquid energy exchange forms directional airflow along the surface of the inclined plate, so that the gas and liquid energy exchange and evaporation are further enhanced;
3. because of the rapid and effective gas-liquid energy exchange on the combination of the energy exchange and the inclined crystallization plate, the original saturated or nearly saturated components in the brine are supersaturated in the falling film flow process, crystals are rapidly separated out and grow on the slope, and the crystals are transported to the bottom of the slope along with the mother liquor;
4. salt crystals and mother liquor enter a solid-liquid separation tank through a collecting tank at the bottom of a slope in a confluent manner, and are immediately and intensively separated, so that the production and the collection are realized, the salt fishing operation in the traditional crystallization tank is omitted, the mechanical and labor cost is saved, the sand pollution is reduced, in addition, the harvesting is performed in time before the adhesion of small crystals, the procedures of crushing and the like are also omitted, and the energy consumption and the cost are further reduced;
5. the salt obtained by the method is formed by rapid crystallization on a slope through clarification of the evaporation tank and the brine buffer tank, and the product has high purity and high value;
6. the crystal obtained by the method has fine and uniform granularity, and is beneficial to later-stage utilization or reprocessing;
7. the method of the invention replaces the traditional salt fishing operation with pump lifting in practice, avoids the construction of a crystallization tank with higher cost, reduces the road construction required by vehicle transportation, and opens up a new way for beach development and poverty relief construction;
8. the method creates conditions for modernization and intellectualization of the ancient and traditional salt nitrate production industry, can utilize the combination of the energy exchange and the crystallization inclined plate to accurately carry out freezing or evaporation according to weather conditions, can more fully utilize the temperature difference between seasons and day and night to prolong the total time of natural energy utilization, and can reduce the pollution of wind and sand to products, the dilution of rain and snow to brine and the like through the optimized management of product fluid.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a system device in an energy-saving salt-sunning method of the invention;
FIG. 2 is a schematic structural diagram of a swash plate assembly in an energy-saving salt solarization method of the invention;
FIG. 3 is a schematic view of a collecting tank in an energy-saving salt sunning method of the invention;
FIG. 4 is an enlarged view of a portion A of FIG. 3;
FIG. 5 is a schematic structural diagram of a solid-liquid separation tank in the energy-saving salt sunning method.
In the drawings: the device comprises a water distribution pipe, 2-inclined plates, 21-supports, 22-bottom plates, 23-first bayonet structures, 24-second bayonet structures, 25-upper flanging structures, 3-collecting tanks, 31-solid-liquid collecting tanks, 32-rainwater collecting tanks, 33-diversion turning plates, 34-turning plate motors, 35-turning plate mechanisms, 36-rainwater pipelines, 37-inclined fine nets, 38-testing devices, 39-solid-liquid collecting tank outlets, 4-solid-liquid separating tanks, 41-solid settling tanks, 42-overflow weirs, 43-mother liquid buffer tanks, 44-mother liquid pumping pipelines, 45-first liquid level sensors, 5-solid lifting machinery, 6-temperature sensors and 7-humidity sensors.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "long", "short", etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the drawings, it is only for convenience of description and simplicity of description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limitations of the present patent, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
The technical scheme of the invention is further described in detail by the following specific embodiments in combination with the accompanying drawings:
example 1
As shown in fig. 1-5, an energy-conserving salt system and use its salt method of drying in the sun, including energy-conserving salt system of drying in the sun, energy-conserving salt system of drying in the sun includes evaporation tank, brine buffer tank, slope crystallization system and is used for carrying out the solid-liquid separation system who separates to the mother liquor and the crystal of slope crystallization system output, brine buffer tank is located slope crystallization system below and with the evaporation tank is linked together, brine buffer tank passes through the pipe connection with the brine distribution system who sets up slope crystallization system top, solid-liquid separation system is located slope crystallization system bottom.
The invention provides a salt sun-drying method, which comprises the following process steps:
s1: pumping salt-containing brine into an evaporation pond;
s2: when the brine in the evaporation tank is saturated, transferring the saturated brine in the tank to a brine buffer tank;
s3: when the weather conditions are suitable for evaporation, brine is pumped from the brine buffer tank to the top of the slope crystallization system through the brine distribution system, and flows down along the inclined surface to form a falling film, so that the falling film is continuously evaporated to reach supersaturation, and salt component crystals are continuously separated out and grow up;
s4: the mother liquor with the separated crystals rolls down the inclined plane of the slope crystallization system and enters a slope bottom solid-liquid separation system to separate the crystals from the mother liquor;
s5: when enough salt crystals are accumulated in the solid-liquid separation system, the salt crystals are lifted and conveyed to a solid-liquid separation system external loading vehicle or are conveyed to a salt storage yard through other conveying machines;
planning the total area and the gradient of the slope according to factors such as local evaporation conditions, brine composition, design yield and investment amount, and correspondingly manufacturing the slope support 21 according to terrain conditions. The slope is generally formed by assembling a plurality of inclined plate assemblies, each inclined plate assembly comprises a plurality of inclined plates 2 arranged in a ladder way and a bottom plate 22 connected with the inclined plates 2, a first bayonet structure 23 is arranged at one end, far away from the solid-liquid separation system, of the bottom plate 22, and the first bayonet structure 23 is clamped with the cross beam of the support 21; a second bayonet structure 24 is arranged at one end of the bottom plate 22 close to the solid-liquid separation system; an inclined plate 2 far away from the solid-liquid separation system in the inclined plate component is provided with an upper flanging structure 25 matched with the second bayonet structure 24. The bottom plate 22 is used to enhance the lateral noise immunity of the swash plate 2.
The water distribution pipe 1 is arranged at the top end of the slope, water spraying holes or water spraying narrow slits are uniformly and densely drilled in the same downward direction of the circumference of the pipe, and the water distribution pipe is preferably provided with a plurality of water inlet interfaces and a plurality of pores/narrow slits of a thick pipe, so that the water pressure and the water distribution in the pipe are uniform as much as possible.
The collecting tank 3 is located at the bottom of the slope, is transversely divided into a solid-liquid collecting tank 31 and a rainwater collecting tank 32, is separated by a diversion turnover plate 33 in the middle, and is turned over the diversion turnover plate 33 inwards or outwards through a turnover plate motor 34 and a turnover plate mechanism 35, so that falling mother liquor is guided to enter the solid-liquid collecting tank 31 or the rainwater collecting tank 32. An inclined fine net 37 is arranged between the upper part of the collecting tank 3 and the bottom edge of the slope, the lower edge of the inclined fine net 37 extends into the solid-liquid collecting tank 31, and most of crystals can be put into the solid-liquid collecting tank 31. A testing device 38 is also arranged between the inclined fine net 37 and the upper part of the collecting tank 3. The solid-liquid collection tank 31 has a sufficient slope to collect the collected crystal and brine mixed liquor into the solid-liquid separation tank 4.
The solid-liquid separation tank 4 is positioned below the solid-liquid collecting tank outlet 39 and is divided into a solid settling tank 41 and a mother liquor buffer tank 43, and the solid settling tank and the mother liquor buffer tank are separated by an overflow weir 42; the solid settling tank 41 and the mother liquor buffer tank 43 are both pointed bottoms; a mother liquor pumping pipeline 44 and a mother liquor first liquid level sensor 45 are arranged in the mother liquor buffer tank 43.
As optimization, a solid conveying machine 5 can be arranged in the solid settling tank 41, and salt nitrate crystals can be lifted and conveyed to the outside of the tank at any time for directly loading or transferring to a storage yard.
The invention is suitable for intelligent operation management. For this purpose, an air temperature sensor 6 and a humidity sensor 7 are added above the slope. When the temperature sensor 6 and the humidity sensor 7 detect that the weather conditions reach set parameters, the chip sends brine to the top of a slope through a brine distribution system, and salt and nitrate separation or salt drying is carried out by utilizing the energy exchange and the crystallization inclined plate 2; when the brine pump is started, the linkage check or starting of the turning plate motor 34 controls the diversion turning plate 33 to be in the inward turning position through the turning plate mechanism 35. When the climate conditions do not accord with the set parameters, the chip stops the brine pump to pump brine to the slope. Under normal conditions, the mother liquor reaching the bottom of the slope has very high conductivity, and the conductivity testing device 38 arranged according to the actual mother liquor conductivity maintains the diversion turning plate 33 at the inverted position, i.e. the solid-liquid mixture or the mother liquor is completely guided to the solid-liquid collecting tank 31.
When raining or going to rain, the temperature sensor 6 or/and the humidity sensor 7 detect that the weather conditions are not favorable for freezing or crystallization, the chip closes the brine pump, and the water distribution pipe 1 on the brine pump is stopped. When partial crystals carried by rainwater flow down along the inclined plate 2, most crystals are guided into the solid-liquid collecting tank 31 by the inclined fine net 37, and rainwater (polluted by the crystals) passes through the inclined fine net 37 and drops into the testing device 38, and the conductivity is measured to be smaller than a set value, the chip controls the flow guide turning plate 33 to turn outwards through the turning plate motor 34 and the turning plate mechanism 35, and the rainwater which passes through the inclined fine net 37 is guided to completely enter the rainwater collecting tank 32 and the rainwater pipeline 36. When the chip restarts the brine pump after raining, the turning plate motor 34 is linked to start the turning plate driving mechanism 35 to control the diversion turning plate 33 to turn inward, and all the dripped mother liquor is guided to the solid-liquid collecting tank 31.
The working principle of the device system is as follows:
when the climatic conditions are favorable for crystallization, the (sodium chloride) saturated brine is pumped to the water distribution pipe 1 and uniformly spread to the top of the slope, and the brine uniformly flows down along the surface of the inclined plate 2 to form a falling film. The thin brine falling film exchanges energy with the solar heating inclined plate 2 in the downward flowing process, the temperature is continuously increased, the evaporation effect is enhanced, and airflow rising along the slope is formed. The replenishment of the lower drying air accelerates the evaporative crystallization. Supersaturated sodium chloride is crystallized and separated out, long and large salt crystals are continuously separated out and washed by mother liquor to roll down the slope, most of the crystals in the solid-liquid mixture fall off are blocked by the inclined fine net 37 and roll into the solid-liquid collecting tank 31, a part of the mother liquor passes through the inclined fine net 37 and drops on the conductivity testing device 38, a high conductivity signal of saturated brine is fed back, the diversion turning plate 33 is kept turned inwards, and most of the mother liquor passes through the inclined fine net 37 and drops on the diversion turning plate 33 and flows into the solid-liquid collecting tank 31 to carry the salt crystals to flow into the solid-liquid separation tank 4.
Since the salt crystals have a specific gravity significantly greater than that of the brine and settle in the solids settling tank 41 before reaching the weir 42, only the mother liquor can flow over the weir 42 into the mother liquor buffer tank 43. A first level sensor 45 in the mother liquor buffer tank 43 controls the mother liquor pump to maintain the liquid level therein always below the overflow weir 42 through the mother liquor pumping line 44. The mother liquor is still saturated sodium chloride brine and can be pumped back to the brine buffer tank for continuous evaporation.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. An energy-saving salt drying system is characterized in that: energy-conserving salt system that shines includes evaporation tank, brine buffer tank, slope crystallization system and is used for carrying out the solid-liquid separation system that separates to the mother liquor and the crystal of slope crystallization system output, brine buffer tank is located slope crystallization system below and with the evaporation tank is linked together, brine buffer tank is in with the setting the brine distribution system at slope crystallization system top passes through the pipe connection, lie in slope crystallization system bottom among the solid-liquid separation system.
2. The energy saving solar salt system of claim 1, wherein: the brine distribution system comprises a brine lift pump, a brine conveying pipeline and a water distribution pipe (1) positioned at the top of the slope crystallization system, wherein the water distribution pipe (1) is connected with the brine buffer tank through the brine conveying pipeline, and directional spray holes or slits are formed in the water distribution pipe; the brine lift pump conveys brine in the brine buffer tank to the water distribution pipe through a brine conveying pipeline, and the brine flows out of the water distribution pipe through the spray holes or the slits.
3. The energy saving solar salt system of claim 1, wherein: the brine distribution system comprises a brine lift pump, a brine conveying pipeline and a water distribution pipe (1) arranged at the top of the slope crystallization system, wherein the water distribution pipe (1) is connected with the brine buffer tank through the brine conveying pipeline, and directional spray holes or slits are formed in the water distribution pipe.
4. The energy saving solar salt system of claim 1, wherein: the solid-liquid separation system comprises a collecting tank (3) arranged at the bottom of an upper inclined plate (2) of the slope crystallization system and a solid-liquid separation tank (4) arranged at the bottom of the collecting tank (3); the collecting tank (3) collects the mother liquid and the crystals flowing down from the inclined plate (2), and the solid-liquid separation tank (4) separates the mother liquid and the crystals collected from the collecting tank (3).
5. The energy saving solar salt system of claim 4, wherein: the collecting tank (3) comprises a solid-liquid collecting tank (31), a rainwater collecting tank (32), an inclined fine net (37) and a testing device (38) for detecting the conductivity of mother liquor, a flow guide plate turnover device for guiding the mother liquor into the solid-liquid collecting tank (31) or the rainwater collecting tank (32) is arranged between the solid-liquid collecting tank (31) and the rainwater collecting tank (32), and the flow guide plate turnover device is electrically connected with the testing device; the solid-liquid collecting tank (31) is provided with a solid-liquid collecting tank outlet (39), and the rainwater collecting tank (32) is provided with a rainwater pipeline (36) communicated with an external drainage system.
6. The energy saving solar salt system of claim 5, wherein: the diversion flap device comprises a flap motor (34) arranged on the collecting tank (3), a flap mechanism (35) arranged on an output shaft of the flap motor (34) and a diversion flap (33) fixedly connected with the flap mechanism (35), and the diversion flap (33) is arranged below the inclined fine net (37) and between the solid-liquid collecting tank (31) and the rainwater collecting tank (32); the flap motor is electrically connected with the testing device (38); the testing device (38) comprises a liquid collecting tray arranged between the inclined fine mesh (37) and the diversion flap (37), a conductivity sensor arranged in the liquid collecting tray and a controller electrically connected with the conductivity sensor, wherein the controller is electrically connected with the flap motor (34).
7. The energy saving solar salt system of claim 4, wherein: be provided with overflow weir (42) in solid-liquid separation groove (4), overflow weir (42) will solid-liquid separation groove (4) are separated for solid sedimentation tank (41) and mother liquor buffer pool (43), be provided with first level sensor (45) in mother liquor buffer pool (43), mother liquor pump and mother liquor pumping pipeline (44) that are connected with the brine buffer pool.
8. The energy saving solar salt system of claim 7, wherein: and a solid lifting device (5) is arranged in the solid settling pond (41), one end of the solid lifting device (5) is positioned at the bottom of the solid settling pond (41), and the other end of the solid lifting device (5) is connected with an external solid conveying device.
9. The energy saving solar salt system of claim 1, wherein: the bottom and the inner side of the evaporation pool are provided with anti-seepage mulching films, and the top of the slope crystallization system is provided with an air temperature sensor, a humidity sensor and a light intensity sensor which are used for detecting weather conditions; and a second liquid level sensor is arranged in the brine buffer tank.
10. A salt solarization method based on the energy-saving salt solarization system of any one of claims 1 to 9, characterized by comprising the following process steps:
s1: introducing or pumping salt-containing brine into an evaporation pond;
s2: when the brine in the evaporation tank is saturated, transferring the saturated brine in the tank to a brine buffer tank;
s3: when the weather conditions are suitable for evaporation, brine is pumped from the brine buffer tank to the top of the slope crystallization system through the brine distribution system, and flows down along the inclined surface to form a falling film, so that the falling film is continuously evaporated to reach supersaturation, and salt component crystals are continuously separated out and grow up;
s4: the mother liquor with the separated crystals rolls down the inclined plane of the slope crystallization system, the crystals are transported into a slope bottom solid-liquid separation system, and the crystals are separated from the mother liquor;
s5: when enough salt crystals are accumulated in the solid-liquid separation system, the salt crystals are lifted and conveyed to the outside of the solid separation system in the solid-liquid separation system for loading or are conveyed to a salt storage yard through a conveying machine.
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| CN113044858A (en) * | 2021-03-16 | 2021-06-29 | 姜秉严 | TGC crystallization process for salt pan |
| WO2022033408A1 (en) * | 2020-08-12 | 2022-02-17 | 暨南大学 | Slope crystallization and solid-liquid separation system |
| CN116443897A (en) * | 2023-04-17 | 2023-07-18 | 山东菜央子盐场有限公司 | Efficient brine preparing system with complementary brine |
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Application publication date: 20201117 |