An energy-saving production line for MVR high-purity salt products

Abstract

The present invention relates to an energy-saving production line for MVR high-purity salt products, which includes a salt well, a brine pond, a filtration section, a reaction section, an evaporation section, a drying section and a salt discharging section. The filtration section includes a coarse filtration tank and a fine filter. A plurality of multifunctional recyclers are arranged inside the brine pond. The multifunctional recycler includes a core column, a pressure filter screen, a lifting partition board, a sedimentation chamber and a pressure filtration chamber. A ground pipe network that is communicated with the pressure filter screen and whose end is connected to the salt well is arranged at the bottom of the multifunctional filter. In the present invention, the brine pond and the filtration section perform natural sedimentation, coarse filtration and fine filtration on the brine pumped out from the salt well, improving the utilization rate of the medicine and the salt output; the multifunctional recycler can collect the sediment, the waste liquid and by-products of the production line. The waste liquid can be pressure-filtered into slag and filtrate. The slag is used for resource recycling in downstream factories, and the filtrate is pumped back into the salt well at a time staggered from the pumped brine. Therefore, the present invention has good environmental protection and economy, is beneficial to increasing the salt output and can reduce the resource development cost, and is suitable for large-scale promotion.

Description

Technical Field

[0001] The present invention belongs to the technical field of deep well salt preparation, and particularly relates to an energy-saving production line for MVR high-purity salt products. Background Art

[0002] Ordinary iodized salt is mostly made by drying seawater in coastal salt fields, while deep well salt is mined from salts more than 500 meters below the ground. Deep well salt contains more various natural mineral elements. After reducing the sodium content, low-sodium salt can also be made. Since deep well salt directly mines the flowing salt layers underground, less water needs to be supplemented after mining, so the production cost is reduced to a certain extent. Deep well salt is distinguished from ordinary well salt, sea salt, etc. Salts mined from more than 500 meters below the ground are considered deep well salt. Deep well salt contains more various natural mineral elements, and the deep well salt produced from the production line is also purer than ordinary salt.

[0003] At present, after a series of treatments on the brine mined by the deep well salt production line, some by-products will be generated, which mostly exist in the form of mixed liquid or salt mud. And because the salt factory is dedicated to salt production, some potentially utilizable substances such as calcium, magnesium, and potassium salts in it. A considerable part of these liquids will be pumped back into the underground layer, which is neither fully utilized nor will it pollute the groundwater. Other fertilizer factories need to obtain these substances that the salt factory does not need from other channels, increasing the cost of resource utilization. The existing patent CN202010850157.9 discloses an energy-saving production line for high-temperature ripening of deep well salt, including a primary reaction tank, a secondary reaction tank, a tertiary heat exchanger, an evaporation tank, a salt-forming centrifuge, and a drying bed arranged in sequence along the material moving direction. Although this production line can achieve certain energy-saving and production-increasing purposes, since the mined brine is directly pumped into the system, a part of the reaction drugs will be used in the reaction link, and the recovery percentage of these drugs is relatively low, so the actual utilization rate of the drugs and the actual output of salt need to be improved. Summary of the Invention

[0004] In view of the above technical problems existing in the deep well salt production line, the present invention provides an energy-saving production line for MVR high-purity salt products with reasonable design, good environmental protection economy, beneficial to increasing the salt output and capable of reducing the resource development cost.

[0005] To achieve the above object, the technical solution adopted by the present invention is that an energy-saving production line for MVR high-purity salt products provided by the present invention includes a salt well. A reaction section, an evaporation section, a drying section, and a salt discharging section are arranged in the pumping direction of the salt well. The reaction section includes a plurality of reaction tanks and heat exchangers. A filtering section is arranged on the feeding side of the reaction section. The filtering section includes a coarse filtering tank and a fine filter arranged according to the flowing direction of brine. A brine pool is arranged on the feeding side of the filtering section. A plurality of multi-functional recyclers are arranged inside the brine pool in a rectangular array and penetrate through the bottom thereof. The multi-functional recycler is of an open structure and its top is lower than the top of the brine pool. A core column penetrating through the bottom is arranged at the center of the multi-functional recycler. The position of the core column close to its bottom is of a hollow structure and a pressure filter screen is arranged on its side. A lifting partition plate which is movably matched with the core column and the inner wall of the recycler is arranged on the core column. The upper and lower parts of the lifting partition plate are respectively a precipitation chamber and a pressure filtration chamber. The precipitation chamber is used for precipitating impurities. The pressure filtration chamber is used for storing waste liquid pumped from the filtering section and the reaction section. A support base is arranged at the bottom of the brine pool. A ground pipe network for supporting the multi-functional recycler is arranged in the support base. The ground pipe network is communicated with the pressure filter screen and its end is connected to the salt well.

[0006] Preferably, a shed is arranged above the brine pool. An overhead crane is movably arranged on the shed. A lifting sling is arranged at the bottom of the overhead crane. The lifting sling is used for cooperating with a lifting lug arranged on the top of the multi-functional recycler.

[0007] Preferably, the multi-functional recycler includes a tank body. Four automatic valves distributed in a cross shape are arranged on the side of the tank body. One end of the automatic valve faces the adjacent tank body, and the adjacent tank bodies are communicated with each other into a passage at the automatic valve.

[0008] Preferably, the automatic valve includes a plug. One end of the plug facing the outside of the tank body is a wedge surface, and the front surface of the wedge surface faces upward. A blind groove is arranged at the other end of the plug, and a spring connected to the core column is arranged in the blind groove.

[0009] Preferably, a ring-shaped flexible self-sealing mouth is arranged at the bottom of the tank body.

[0010] Preferably, a recovery pipe is arranged on the waste liquid recovery side of the filtering section and the reaction section. A recovery pump is arranged on the recovery pipe. Two branch pipes are branched out from the discharging side of the recovery pipe. The two branch pipes are connected to different multi-functional recyclers, and control valves are arranged on the branches.

[0011] Preferably, the brine pool is of a box structure and a support frame is arranged on its top. The support frame includes a plurality of cross plates and longitudinal plates.

[0012] Preferably, a solid wall is provided inside the brine pool to separate adjacent multifunctional recoveries.

[0013] Compared with the prior art, the advantages and positive effects of the present invention are:

[0014] 1. The present invention provides an MVR high-purity salt product energy-saving production line, which uses a brine pool and a filtration section to naturally precipitate, coarsely filter and finely filter the brine pumped out of the salt well, which can improve the purity of the brine entering the reaction section, which is beneficial to reducing the amount of reaction drugs, improving the utilization rate of drugs and the amount of salt output; the multifunctional recovery device can collect the waste liquid and by-products of the precipitate and the production line, and the waste liquid can be filtered into slag and filtrate under the action of the liquid pressure above the partition. The slag can be used for resource recycling in downstream factories, and the filtrate is pumped back to the salt well at an alternate time with the pumped brine, reducing the pollution of the salt factory waste liquid to the environment. This production line is reasonably designed, has good environmental protection and economic performance, is beneficial to increasing the amount of salt output and can reduce the cost of resource development, and is suitable for large-scale promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 A schematic diagram of the structure of an MVR high-purity salt product energy-saving production line provided in an embodiment;

[0017] Figure 2 A top view of a brine pond provided for an embodiment;

[0018] Figure 3 for Figure 1 A magnified schematic diagram of the structure in the middle;

[0019] In the above figures, 1, salt well; 2, reaction section; 21, reaction tank; 22, heat exchanger; 3, evaporation section; 4, drying section; 5, salt outlet section; 6, filtration section; 61, coarse filter tank; 62, fine filter; 7, brine pool; 71, solid wall; 8, multifunctional recovery device; 81, core column; 82, filter press; 83, lifting partition; 84, sedimentation chamber; 85, filter press chamber; 86, lifting ear; 87, tank body; 88, automatic valve; 881, plug; 882, wedge surface; 883, spring; 9, ground pipe network; 10, scaffolding; 11, overhead crane; 12, lifting sling; 13, recovery pipe; 14, recovery pump; 15, branch pipe; 16, support frame. DETAILED DESCRIPTION

[0020] To better understand the above objects, features, and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. For convenience of description, words such as "upper", "lower", "left", and "right" hereinafter only represent the same directions as the upper, lower, left, and right directions of the accompanying drawings themselves, and do not limit the structure.

[0021] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the present invention is not limited by the specific embodiments disclosed in the following specification.

[0022] Embodiments, such as Figure 1 , Figure 2 and Figure 3 shown, an energy-saving production line for MVR high-purity salt products provided by the present invention includes a salt well 1. A reaction section 2, an evaporation section 3, a drying section 4, and a salt discharging section 5 are arranged in the pumping direction of the salt well 1. The reaction section 2 includes a plurality of reaction tanks 21 and a heat exchanger 22. On this basis, a filtering section 6 is arranged on the feeding side of the reaction section 2 provided by the present invention. The filtering section 6 includes a coarse filtering tank 61 and a fine filter 62 distributed according to the flowing direction of the brine. A brine pool 7 is arranged on the feeding side of the filtering section 6. A plurality of multi-functional recyclers 8 distributed in a rectangular array and penetrating through its bottom are arranged inside the brine pool 7. The multi-functional recycler 8 is an open structure and its top is lower than the top of the brine pool 7. A core column 81 penetrating through its bottom is arranged at the center of the multi-functional recycler 8. The position of the core column 81 close to its bottom is a hollow structure and a pressure filter screen 82 is arranged on its side. A lifting partition plate 83 that is movably matched with the core column 81 and the inner wall of the recycler is arranged on the core column 81. The upper and lower parts of the lifting partition plate 83 are a precipitation chamber 84 and a pressure filtration chamber 85 respectively. The precipitation chamber 84 is used to precipitate impurities, and the pressure filtration chamber 85 is used to store the waste liquid pumped in from the filtering section 6 and the reaction section 2. A support base is arranged at the bottom of the brine pool 7. A ground pipe network 9 used to support the multi-functional recycler 8 is arranged in the support base. The ground pipe network 9 is communicated with the pressure filter screen 82 and its end is connected to the salt well 1. Among them, the evaporation section 3 is an MVR evaporator. Compared with the traditional multi-effect evaporation, the MVR evaporator has the advantage of energy saving and can further improve the energy-saving effect.

[0023] Specifically, after pumping out the brine in the salt well 1, the brine is naturally precipitated by the brine pond 7. The precipitate enters the precipitation chamber 84 of the multi-functional recycler 8 through natural stratification, while the upper layer liquid enters the filtration section 6 through the pump pipe. The precipitate enters different multi-functional recyclers 8 in units, which not only helps to reduce the disturbance effect of the pump pipe pumping the upper layer liquid on the precipitates at different positions, but also enables the cleaning of different multi-functional recyclers when the height of the upper layer liquid is lower than the top of the multi-functional recycler 8. Further, the filtration section 6 uses a coarse filter tank 61 and a fine filter 62 to conduct coarse filtration and fine filtration on the brine pumped from the brine pond 7, which can improve the purity of the brine entering the reaction section 2, help reduce the dosage of reaction chemicals, improve the utilization rate of the chemicals and the actual salt output. If the fine filter 62 uses a membrane filter, it can filter out some ions, reduce the consistency of the reaction by-products in the subsequent reaction section 2, and improve the fluidity of the waste liquid and salt mud to a certain extent.

[0024] To improve the environmental protection economy of the present invention, the multi-functional recycler 8 provided by the present invention can not only collect the precipitate, but also collect the waste liquid and by-products of the production line recovered through the recovery pipe 13. After the waste liquid is recovered into the pressure filtration chamber 85, the liquid above the partition can transmit the pressure filtration pressure to the waste liquid after the liquid level above the partition increases. The waste liquid is pressure-filtered into slag and filtrate under the action of pressure. The slag remains in the multi-functional recycler 8 and is collected centrally for resource reuse in downstream factories after the subsequent cleaning of the multi-functional recycler 8; the filtrate enters the support base through the pressure filter screen 82 and is pumped back into the salt well 1 through the underground pipe network. The period of the filtrate returning to the well is staggered with the working period of pumping brine. Due to the fluidity of the underground salt layer, it does not affect the pumping operation of the next cycle, and at the same time reduces the environmental pollution of the waste liquid in the salt factory.

[0025] To facilitate the cleaning of different multi-functional recyclers 8, a shed 10 is provided above the brine pond 7 of the present invention. A crane 11 is movably arranged on the shed 10, and a lifting sling 12 is arranged at the bottom of the crane 11. The lifting sling 12 is used to cooperate with the lifting lug 86 arranged on the top of the multi-functional recycler 8. The crane 11 can move in a cross direction along the shed 10, and after the lifting sling 12 is connected to the lifting lug 86, it can lift the multi-functional recycler 8, lift the multi-functional recycler 8 away from the original working position for segmented recovery of the precipitate and slag, and does not affect the pumping operation of the upper layer liquid before it is completely lifted away from the brine pond 7. When the height of the upper layer liquid is lower than the top of the multi-functional recycler 8, different multi-functional recyclers can be cleaned online.

[0026] All the multifunctional recyclers 8 provided by the present invention form a passage with the waste liquid in the filtration section 6 and the reaction section 2 through a set of recovery pipes 13, reducing the input cost of pipes and valves; moreover, the work of other multifunctional recyclers 8 will not be affected after an individual multifunctional recycler 8 is lifted away from its original work position. Specifically, the multifunctional recycler 8 provided by the present invention includes a tank body 87, and four automatic valves 88 distributed in a cross shape are arranged on the side of the tank body 87. One end of the automatic valve 88 faces the adjacent tank body 87, and the adjacent tank bodies 87 are interconnected into a passage at the automatic valve 88. After an individual multifunctional recycler 8 leaves its original work position along the cylindrical surface of the core column under the action of the overhead crane 11 and the lifting sling 12, the automatic valve 88 first retracts into the interior of the tank body 87, and the outer wall of the tank body 87 is used for sliding contact sealing. After the position of the automatic valve 88 is higher than other tank bodies 87, the automatic valve 88 automatically extends, and its side seals the original opening, and the automatic valve 88 on the multifunctional recycler 8 that was originally in contact with this tank body 87 can also seal the previous open circuit, thereby ensuring the on-line recovery operation of the waste liquid in other multifunctional recyclers 8.

[0027] In order to improve the utilization rate of the automatic valve 88, the automatic valve 88 provided by the present invention includes a plug 881. One end of the plug 881 facing the outside of the tank body 87 is a wedge surface 882, the front surface of the wedge surface 882 faces upward, and a blind groove is provided at the other end of the plug 881, and a spring 883 connected to the core column 81 is arranged in the blind groove. Among them, the wedge surface 882 can contact the tank body 87 from top to bottom, and the pressure exerted by the moving tank body 87 on the wedge surface 882 causes it to contract, thereby opening the passage of the adjacent tank body 87, and further ensuring that the multifunctional recycler 8 has a reasonable waste liquid inlet and outlet path after being cleaned and returned to its position.

[0028] Furthermore, the present invention is provided with an annular flexible self-sealing opening at the bottom of the tank body. The flexible self-sealing opening can seal the fitting gap between the tank body and the core column at the original work position, and the flexible self-sealing opening can automatically shrink to a smaller diameter after leaving the guiding surface of the core column with the tank body, avoiding a large area of the pressed filter residue falling back into the brine pool.

[0029] In order to improve the efficiency of recovering waste liquid in this production line, the present invention is provided with a recovery pipe 13 on the waste liquid recovery side of the filtration section 6 and the reaction section 2. A recovery pump 14 is arranged on the recovery pipe 13. Two branch pipes 15 are branched out from the discharge side of the recovery pipe 13, and the two branch pipes 15 are connected to different multifunctional recyclers 8, and control valves are arranged on the branches. In this way, if the multifunctional recycler 8 closest to the branch pipe 15 leaves its original work position, the control valve on the corresponding branch can be closed, and the other branch can continue to pump the production line waste liquid and by-products into other multifunctional recyclers 8.

[0030] To facilitate the cleaning efficiency of the multi-functional recycler 8 by workers, the brine pond 7 provided by the present invention has a box structure and a support frame 16 is provided at its top. The support frame 16 includes a plurality of cross plates and longitudinal plates. The cross plates and longitudinal plates allow people to walk above the brine pond 7. The box-shaped design of the brine pond 7 can reduce the construction period of the brine pond 7.

[0031] To ensure the sealing performance between adjacent multi-functional recyclers 8, the present invention provides a solid wall 71 inside the brine pond 7 for separating adjacent multi-functional recyclers 8. The wall of the solid wall is cylindrical and matches the cylindrical surface of the tank body. On the one hand, the solid wall 71 can ensure that the upper layer liquid in the brine pond 7 remains within the controllable area of the multi-functional recycler 8, and on the other hand, it can improve the relative sealing performance of the multi-functional recycler 8 during its operation.

[0032] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention in other forms. Any person skilled in the relevant art may use the technical content disclosed above to make changes or modifications into equivalent embodiments with equivalent changes and apply them to other fields. However, as long as it does not depart from the technical solution content of the present invention, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. An energy-saving production line for high-purity salt products, comprising a salt well, wherein a reaction section, an evaporation section, a drying section and a salt output section are arranged in the pumping direction of the salt well, and the reaction section includes a plurality of reaction tanks and heat exchangers, characterized in that, A filtration section is provided on the feed side of the reaction section. The filtration section includes a coarse filtration tank and a fine filter arranged in the flow direction of the bittern. A bittern pond is provided on the feed side of the filtration section. Inside the bittern pond, a plurality of multifunctional recyclers are arranged in a rectangular array and penetrate through its bottom. The multifunctional recycler is an open structure and its top is lower than the top of the bittern pond. A core column penetrating through its bottom is provided at the center of the multifunctional recycler. The position of the core column near its bottom is a hollow structure and a pressure filter screen is arranged on its side. A lifting partition plate that is movably matched with the core column and the inner wall of the recycler is arranged on the core column. Above and below the lifting partition plate are a precipitation chamber and a pressure filtration chamber respectively. The precipitation chamber is used for precipitating impurities, and the pressure filtration chamber is used for storing the waste liquid pumped from the filtration section and the reaction section. A support base is provided at the bottom of the bittern pond. A ground pipe network for supporting the multifunctional recycler is arranged in the support base. The ground pipe network is communicated with the pressure filter screen and its end is connected to a salt well; A shed is provided above the bittern pond. A trolley is movably arranged on the shed. A lifting sling is arranged at the bottom of the trolley. The lifting sling is used for cooperating with the lifting lugs arranged on the top of the multifunctional recycler; The multifunctional recycler includes a tank body. Four automatic valves distributed in a cross shape are arranged on the side of the tank body. One end of the automatic valve faces the adjacent tank body, and the adjacent tank bodies are communicated with each other to form a passage at the automatic valve. The automatic valve includes a plug. The end of the plug facing the outside of the tank body is a wedge surface, and the front of the wedge surface faces upward. A blind groove is arranged at the other end of the plug, and a spring connected to the core column is arranged in the blind groove.

2. The energy-saving production line for a high-purity salt product according to claim 1, wherein A ring-shaped flexible self-sealing mouth is provided at the bottom of the tank body.

3. The energy-saving production line for a high-purity salt product according to claim 2, wherein, A recovery pipe is provided on the waste liquid recovery side of the filtration section and the reaction section. A recovery pump is arranged on the recovery pipe. Two branch pipes are branched out from the discharge side of the recovery pipe. The two branch pipes are connected to different multifunctional recyclers, and control valves are arranged on the branch pipes.

4. The energy-saving production line for a high-purity salt product according to claim 1, wherein The bittern pond is a box structure and a support frame is arranged on its top. The support frame includes a plurality of cross plates and longitudinal plates.

5. The energy-saving production line for a high-purity salt product according to claim 1 or 4, characterized in that, Solid walls for spacing adjacent multifunctional recyclers are arranged inside the bittern pond.

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