Vegetable oil production device and vegetable oil production method

Abstract

The present invention relates to the technical field of vegetable oil production. Disclosed are a vegetable oil production device and a vegetable oil production method. The device comprises a raw material tank, a heat exchanger and a membrane structure; the membrane structure comprises a plurality of membrane assemblies which are sequentially communicated; each membrane assembly comprises a plurality of membrane tubes arranged in parallel; the raw material tank is provided with a feed port, and a discharge port of the raw material tank is separately communicated with a feed port of the membrane structure and a waste discharge pipe; a clear liquid outlet of the membrane structure is communicated with a collecting structure; a feed port of the heat exchanger is communicated with a discharge port of the membrane structure; the discharge port of the membrane structure is further communicated with the waste discharge pipe; and a discharge port of the heat exchanger is communicated with a reflow port of the raw material tank. The present invention solves the problems of chemical reagent addition caused by excessive processing in the traditional vegetable oil refining process and loss of active substances and heat-sensitive substances in the vegetable oil due to high-temperature refining.

Description

Vegetable oil production device and production method Technical Field

[0001] The present invention relates to the technical field of vegetable oil production, in particular to a vegetable oil production device and a production method using multiple groups of tubular ceramic membranes in parallel. Background Art

[0002] Traditional vegetable oil production methods generally refer to refining crude oil. The presence of impurities in crude oil not only affects the edible value and storage safety of the oil, but also brings difficulties to the deep processing of the oil. During refining, impurities that have adverse effects on edible, storage, industrial production, etc., such as mucilage, metals, phospholipids, free fatty acids and pigments, are removed as much as possible. At the same time, the original nutritional active substances, such as squalene, phytosterols and vitamins, are retained as much as possible. However, the current traditional vegetable oil refining methods, including soybean oil, peanut oil and cottonseed oil, all undergo chemical refining processes such as degumming, desolventizing, deacidification, decolorization and deodorization. There are problems such as cumbersome procedures and excessive processing (such as using a large amount of chemical preparations and undergoing high-temperature treatment), resulting in serious loss of nutritional active substances in the vegetable oil products after chemical refining, and the generation of harmful substances such as chemical residues, trans fatty acids and chloropropane. For example, the refining process for camellia oil involves degumming, deacidification, decolorization, deodorization, and dewaxing. While these processes effectively remove non-triglyceride impurities from the crude oil, the addition of chemical reagents and high-temperature treatment also affect the oil's quality, destroying beneficial substances such as squalene, phytosterols, and vitamin E. Therefore, there is an urgent need for a green, physical process that is energy-efficient, efficient, and maximizes nutrient retention.

[0003] Under the current health and nutrition standards, the purpose of oil processing is to remove unnecessary and harmful impurities from oils according to different requirements and uses, so that the finished plant oils meet national standards while improving processing efficiency and retaining the original active nutrients to the greatest extent.

[0004] Summary of the Invention

[0005] The purpose of the present invention is to provide a vegetable oil production device and production method, which solves the problems of excessive processing in the traditional vegetable oil refining process leading to the addition of chemical reagents and the loss of active substances and heat-sensitive substances in the vegetable oil due to high-temperature refining.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention provides a vegetable oil production device, comprising a raw material tank, a heat exchanger and a membrane structure, wherein the membrane structure comprises a plurality of membrane assemblies connected in sequence, each of the membrane assemblies comprises a plurality of membrane tubes arranged in parallel, the raw material tank is provided with a feed port, the discharge port of the raw material tank is respectively connected to the feed port and the sewage pipe of the membrane structure, the clear liquid outlet of the membrane structure is connected to a collection structure, the feed port of the heat exchanger is connected to the discharge port of the membrane structure, the discharge port of the membrane structure is also connected to the sewage pipe, and the discharge port of the heat exchanger is connected to the reflux port of the raw material tank.

[0008] Preferably, a filter assembly is provided between the discharge port of the raw material tank and the feed port of the membrane structure, and the filter assembly is also connected to the sewage pipe. The filter assembly includes at least two parallel filters, and each filter is respectively connected to the discharge port of the raw material tank and the feed port of the membrane structure.

[0009] Preferably, a feed pump is provided between the discharge port of the raw material tank and the feed port of the membrane structure, the feed pump is connected to the sewage pipe, and the pipeline between the feed pump and the filter assembly is connected to the sewage pipe.

[0010] Preferably, a liquid level meter and a temperature sensor are provided in the raw material tank.

[0011] Preferably, a circulation pump is provided in the membrane structure, the circulation pump is provided on the pipeline between the membrane modules, and the circulation pump is communicated with the sewage pipe.

[0012] Preferably, it further comprises a pickling batching tank and an alkali washing batching tank, both of which are connected to the raw material tank. The raw material tank is also provided with a water inlet for connecting to an external water source.

[0013] Preferably, metering pumps are provided on the pipeline connecting the pickling material tank and the raw material tank, and on the pipeline connecting the alkali washing material tank and the raw material tank.

[0014] Preferably, a hot air blower is further included, and the air outlet of the hot air blower is connected to the raw material tank.

[0015] The present invention also provides a vegetable oil production method using the vegetable oil production device, wherein the filtration process comprises the following steps:

[0016] Step 1: Pour the material into the raw material tank, open the second valve at the discharge port of the raw material tank, the third valve of the filter assembly, and the reflux valve at the discharge port of the heat exchanger;

[0017] Step 2: Turn on the feed pump to transport the material in the raw material tank to the membrane structure, so that the material fills the membrane structure and each pipeline, and exhausts the air;

[0018] Step 3: Open the first valve at the clear liquid outlet of the membrane structure and start the circulation pump to circulate the material in each membrane module of the membrane structure;

[0019] Step 4: Adjust the opening of the first valve so that the pressure gauge at the clear liquid outlet of the membrane structure is within the operating pressure range. Under the action of the transmembrane pressure difference between the circulation pump and the membrane assembly, the clear liquid of the material entering the membrane assembly permeates the side walls of each membrane tube in the membrane assembly.

[0020] Step 5: The clear liquid flows out of the clear liquid outlet of the membrane structure and is collected. After filtration, the concentrated liquid remaining in the membrane structure is heated by the heat exchanger and then returned to the raw material tank for further filtration. After the filtration is completed, the circulation pump and the feed pump are stopped in sequence.

[0021] The cleaning process includes the following steps:

[0022] Step 1: Open the first drain valve at the discharge port of the raw material tank to drain the raw material tank, open the second drain valve between the filter assembly and the drain pipe to drain the filter assembly, open the third drain valve between the feed pump and the drain pipe to drain the feed pump, open the fourth drain valve between the discharge port of the membrane structure and the drain pipe to drain the membrane structure, and open the fifth drain valve between the circulation pump and the drain pipe to drain the circulation pump;

[0023] Step 2: introduce water into the raw material tank through the water inlet, introduce the acid wash solution in the acid wash batching tank and the alkaline wash solution in the alkaline wash batching tank into the raw material tank, open the third valve of the filter assembly and the reflux valve at the outlet of the heat exchanger, and start the feed pump and the circulation pump for cleaning;

[0024] Step 3: After cleaning is completed, stop the circulation pump and the feed pump in sequence;

[0025] Step 4: Turn on the hot air blower to evaporate the moisture inside the device and pipes.

[0026] Compared with the prior art, the present invention has achieved the following technical effects:

[0027] Compared with the existing technology, the present invention has the following advantages: high efficiency and stability: a plurality of membrane tubes are respectively arranged in multiple membrane components, which increases the membrane area, improves the filtration efficiency, and has a long continuous and stable filtration time; low-temperature filtration: equipped with a heat exchanger, through which an ethanol medium can be introduced through an external circulating refrigerator to achieve low-temperature filtration, and retain the active substances and heat-sensitive substances in the vegetable oil to the greatest extent; easy cleaning: equipped with a hot air blower, after the equipment is cleaned with acid washing liquid and alkaline washing liquid, the equipment and pipelines can be quickly dried to evaporate the internal moisture, which is conducive to the next batch of production and saves time. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] FIG1 is a schematic diagram of a vegetable oil production device according to the present invention;

[0030] FIG2 is a schematic diagram of a vegetable oil production device according to the present invention;

[0031] Among them: 1- membrane assembly, 2- electric control cabinet, 3- feed pump, 4- circulation pump, 5- raw material tank, 6- pickling material tank, 7- alkali washing material tank, 8- heat exchanger, 9- filter, 10- metering pump, 11- drain pipe, 12- first valve, 13- second valve, 14- third valve, 15- fourth valve, 16- first drain valve, 17- second drain valve, 18- third drain valve, 19- fourth drain valve, 20- fifth drain valve, 21- pressure gauge, 22- hot air blower, 23- reflux valve. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] The purpose of the present invention is to provide a vegetable oil production device and production method, which solves the problems of excessive processing in the traditional vegetable oil refining process leading to the addition of chemical reagents and the loss of active substances and heat-sensitive substances in the vegetable oil due to high-temperature refining.

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Example 1

[0036] As shown in Figures 1 and 2: This embodiment provides a vegetable oil production device, including a raw material tank 5, a heat exchanger 8 and a membrane structure. The membrane structure includes 2 to 5 membrane modules 1 connected in sequence. Each membrane module 1 includes 10 to 20 ceramic membrane tubes arranged in parallel, with a pore size of 0.01 μm to 2 μm. The raw material tank 5 is provided with a feed port, and the discharge port of the raw material tank 5 is respectively connected to the feed port and the sewage pipe 11 of the membrane structure. The clear liquid outlet of the membrane structure is connected to the collection structure, and a first valve is provided at the clear liquid outlet of the membrane structure. Door 12 and pressure gauge 21, the working range of pressure gauge 21 is 0.01mpa~0.9mpa, the flow rate of the clear liquid at the clear liquid outlet is 0.6L / min~6.5L / min, the feed port of heat exchanger 8 is connected with the discharge port of membrane structure, the discharge port of membrane structure is also connected with sewage pipe 11, the discharge port of heat exchanger 8 is connected with the reflux port of raw material tank 5, a reflux valve 23 is provided between the discharge port of heat exchanger 8 and the reflux port of raw material tank 5, and heat exchanger 8 is also provided with medium inlet and medium outlet. The membrane tube of this embodiment adopts physical separation technology, which has the advantages of simple operation, high separation efficiency, precise energy saving, etc. Ceramic membrane has the advantages of resistance to organic solvent swelling, acid and alkali resistance, pollution resistance and easy cleaning. In this embodiment, ceramic membrane separation technology is used to physically purify vegetable oil, replacing the traditional chemical refining process, to achieve green and efficient production of high-quality vegetable oil that exceeds national standards.

[0037] Specifically, in this embodiment, a liquid level gauge and a temperature sensor are provided in the raw material tank 5, and each is connected to the electrical control cabinet 2. A second valve 13 is provided at the discharge port of the raw material tank 5. The pipeline between the second valve 13 and the filter assembly is connected to the sewage pipe 11 via a first connecting pipe, and the first connecting pipe is provided with a first drain valve 16.

[0038] In this embodiment, a filter assembly is provided between the discharge port of the raw material tank 5 and the feed port of the membrane structure. The filter assembly is used to filter large particles and debris in the material. The filter assembly is also connected to the drain pipe 11. The filter assembly includes at least two parallel filters 9, each filter 9 is respectively connected to the discharge port of the raw material tank 5 and the feed port of the membrane structure. A third valve 14 is provided between the discharge port of the raw material tank 5 and the filter 9, and a feed pump 3 is provided between the filter 9 and the feed port of the membrane structure so that the material in the raw material tank 5 can be pumped into the membrane structure. A fourth valve 15 is provided between the filter 9 and the feed pump 3, and the pipeline between the fourth valve 15 and the feed pump 3 is connected to the drain pipe 11 through a second connecting pipe, and a second drain valve 17 is provided on the second connecting pipe. The feed pump 3 is connected to the drain pipe 11, and a third drain valve 18 is provided between the feed pump 3 and the drain pipe 11.

[0039] In this embodiment, a fourth drain valve 19 is provided between the discharge port of the membrane structure and the drain pipe 11, and a circulation pump 4 is provided in the membrane structure. The circulation pump 4 is provided on the pipeline between any two membrane components 1, so that the material can achieve cross-flow circulation in the membrane structure. The circulation pump 4 is connected to the drain pipe 11 through a third connecting pipe, and a fifth drain valve 20 is provided on the third connecting pipe.

[0040] This embodiment also includes a CIP cleaning system (cleaning in place), which is used for circulating cleaning of pipelines and production equipment. The CIP cleaning system includes a pickling material tank 6 and an alkali washing material tank 7. The pickling material tank 6 and the alkali washing material tank 7 are both connected to the raw material tank 5. A metering pump 10 is provided on the pipeline connecting the pickling material tank 6 and the raw material tank 5, and on the pipeline connecting the alkali washing material tank 7 and the raw material tank 5. The metering pump 10 is used to measure the amount of pickling solution and alkali washing solution. The raw material tank 5 is also provided with a water inlet, which is used to connect to an external water source.

[0041] The heat exchanger 8 in this embodiment can be equipped with a refrigerator and a heating device to achieve cooling of the material and heating of the cleaning liquid during the cleaning process.

[0042] This embodiment further includes a hot air blower 22 , and an air outlet of the hot air blower 22 is connected to the raw material tank 5 .

[0043] The device of this embodiment can directly complete the production of high-quality vegetable oil in a one-step method, saving costs. The production process is a non-thermal physical processing, which is green and environmentally friendly. While ensuring that the vegetable oil meets national standards, the beneficial ingredients therein are retained to the greatest extent.

[0044] In this embodiment, the opening and closing of each valve and each pump can be controlled by the electric control cabinet 2 to realize automated production; a plurality of membrane tubes can be produced in parallel to improve production efficiency. At the same time, the heat exchanger 8 can be equipped to realize low-temperature filtration to ensure the retention of nutrients in the vegetable oil; in addition, the embodiment is equipped with a hot air blower 22. After the device is cleaned, the device and the pipeline can be quickly dried to evaporate the internal moisture, which is beneficial to the production of the next batch and saves time.

[0045] In this embodiment, the electric control cabinet 2 is provided with an automatic control system, which is a programmable logic controller (PLC), and the control process is based on the existing technology.

[0046] Example 2

[0047] This embodiment provides a vegetable oil production method using the vegetable oil production device of embodiment 1. The filtration process includes the following steps:

[0048] Step 1: Pour the material into the raw material tank 5, open the second valve 13 at the discharge port of the raw material tank 5, the third valve 14 of the filter assembly, and the reflux valve 23 at the discharge port of the heat exchanger 8;

[0049] Step 2: Turn on the feed pump 3 to deliver the material in the raw material tank 5 to the membrane structure, so that the material fills the membrane structure and each pipeline, and exhausts the air to reduce damage to the membrane tube;

[0050] Step 3: Open the first valve 12 at the clear liquid outlet of the membrane structure and start the circulation pump 4 to circulate the material in each membrane module 1 of the membrane structure;

[0051] Step 4: Adjust the opening of the first valve 12 so that the pressure gauge 21 at the clear liquid outlet of the membrane structure is within the operating pressure range. Under the action of the transmembrane pressure difference between the circulation pump 4 and the membrane module 1, the clear liquid of the material entering the membrane module 1 permeates the side walls of each membrane tube in the membrane module 1;

[0052] Step 5: The clear liquid flows out of the clear liquid outlet of the membrane structure and is collected. After filtration, the concentrated liquid remaining in the membrane structure is heat exchanged in the heat exchanger 8 and then returned to the raw material tank 5 for further filtration. After the filtration is completed, the circulation pump 4 and the feed pump are stopped in sequence.

[0053] The cleaning process includes the following steps:

[0054] Step 1: Open the first drain valve 16 at the discharge port of the raw material tank 5 to drain the raw material tank 5, open the second drain valve 17 between the filter assembly and the drain pipe 11 to drain the filter assembly, open the third drain valve 18 between the feed pump 3 and the drain pipe 11 to drain the feed pump 3, open the fourth drain valve 19 between the discharge port of the membrane structure and the drain pipe 11 to drain the membrane structure, and open the fifth drain valve 20 between the circulation pump 4 and the drain pipe 11 to drain the circulation pump 4;

[0055] Step 2: introduce water into the raw material tank 5 through the water inlet, introduce the acid wash solution in the acid wash batching tank 6 and the alkaline wash solution in the alkaline wash batching tank 7 into the raw material tank 5, open the third valve 14 of the filter assembly and the reflux valve 23 at the outlet of the heat exchanger 8, and start the feed pump 3 and the circulation pump 4 for cleaning;

[0056] Step 3: After cleaning is completed, stop the circulation pump 4 and the feed pump in sequence;

[0057] Step 4: Turn on the hot air blower 22 to evaporate the moisture inside the device and the pipeline.

[0058] Application Example 1

[0059] Camellia crude oil enters the raw material tank 5 and is activated under the control of the control system. The camellia crude oil is pumped to the membrane structure via the feed pump 3 for filtration. The filtered camellia oil flows out of the first valve 12 at the clear liquid outlet of the membrane structure. The permeate obtained by the vegetable oil production device is the camellia oil clear liquid. After the filtration process is completed, the equipment is cleaned. Under the control of the control system, the CIP cleaning process is activated through the acid wash batch tank 6 and the alkaline wash batch tank 7. The equipment and pipelines are acid- and alkaline-washed respectively. A hot air blower 22 is used to quickly evaporate moisture from the equipment and pipelines.

[0060] The filtration operating parameters of the membrane structure are: two membrane modules 1, each membrane module 1 is composed of 15 ceramic membrane tubes, the membrane pore size is 0.3 μm, the reading of the pressure gauge 21 is 0.2 MPa, and the flow rate is 1.5 L / min.

[0061] Application Example 2

[0062] The filtration and cleaning procedures in this application example are consistent with those in application example 1, except that:

[0063] The filtration operating parameters of the membrane structure are: two membrane modules 1, each membrane module 1 is composed of 15 ceramic membrane tubes, the membrane pore size is 0.25 μm, the reading of the pressure gauge 21 is 0.3 MPa, and the flow rate is 2.5 L / min.

[0064] Application Example 3

[0065] The filtration and cleaning procedures in this application example are consistent with those in application example 1, except that:

[0066] The filtration operating parameters of the membrane structure are: two membrane modules 1, each membrane module 1 is composed of 15 ceramic membrane tubes, the membrane pore size is 0.2 μm, the reading of the pressure gauge 21 is 0.4 MPa, and the flow rate is 3.5 L / min.

[0067] Application Example 4

[0068] The filtration and cleaning procedures in this application example are consistent with those in application example 1, except that:

[0069] The filtration operating parameters of the membrane structure are: two membrane modules 1, each membrane module 1 is composed of 15 ceramic membrane tubes, the membrane pore size is 0.15 μm, the reading of the pressure gauge 21 is 0.5 MPa, and the flow rate is 4.5 L / min.

[0070] The quality of camellia oil produced using Application Examples 1 to 4 of the vegetable oil production device and production method of the present invention was tested. The acid value was measured according to the national standard GB 5009.229-2016, Determination of Acid Value in Foods; the peroxide value was measured according to the national standard GB 5009.227-2016, Determination of Peroxide Value in Foods; the moisture and volatile matter content were measured according to the national standard GB 5009.236-2016, Determination of Moisture and Volatile Matter in Animal and Vegetable Fats and Oils; and the insoluble impurity content was measured according to the national standard GB / T 15688-2008, Determination of Insoluble Impurity Content in Animal and Vegetable Fats and Oils. Squalene is determined according to the requirements of the agricultural standard NY / T 3673-2020 Determination of squalene content in vegetable oils, vitamin E (tocopherol) is determined according to the requirements of the national standard GB 5009.82-2016 Determination of vitamins A, D and E in foods, and phytosterols are determined according to the national standard GB / T 25223-2010 Determination of sterol composition and total sterol content in animal and plant oils by gas chromatography.

[0071] Table 1 Quality test results of camellia oil produced by the vegetable oil production device and production method of the present invention

[0072] As can be seen from the above table, the acid value, peroxide value, moisture and volatile matter content and insoluble impurity content of the camellia oil produced by the vegetable oil production device and production method of the present invention are significantly lower than the requirements of the national standard GB / T 11765-2018, and the nutrients phytosterols, squalene and α-tocopherols of the camellia oil of Application Examples 1 to 4 are all retained, which shows that the camellia oil produced by the vegetable oil production device and production method of the present invention can retain the nutrients therein to the greatest extent.

[0073] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A vegetable oil production device, characterized in that: It includes a raw material tank, a heat exchanger and a membrane structure. The membrane structure includes a number of sequentially connected membrane modules. Each of the membrane modules includes a number of juxtaposed membrane tubes. The raw material tank is provided with a feed inlet. The discharge outlet of the raw material tank is respectively communicated with the feed inlet of the membrane structure and a sewage pipe. The clear liquid outlet of the membrane structure is communicated with a collection structure. The feed inlet of the heat exchanger is communicated with the discharge outlet of the membrane structure. The discharge outlet of the membrane structure is also communicated with the sewage pipe. The discharge outlet of the heat exchanger is communicated with the reflux inlet of the raw material tank.

2. The vegetable oil production device according to claim 1, characterized in that: A filtering component is arranged between the discharge outlet of the raw material tank and the feed inlet of the membrane structure. The filtering component is also communicated with the sewage pipe. The filtering component includes at least two juxtaposed filters. Each of the filters is respectively communicated with the discharge outlet of the raw material tank and the feed inlet of the membrane structure.

3. The vegetable oil production device according to claim 2, wherein: A feed pump is arranged between the discharge outlet of the raw material tank and the feed inlet of the membrane structure. The feed pump is communicated with the sewage pipe. The pipeline between the feed pump and the filtering component is communicated with the sewage pipe.

4. The vegetable oil production device according to claim 1, characterized in that: A liquid level gauge and a temperature sensor are arranged in the raw material tank.

5. The vegetable oil production device according to claim 1, characterized in that: A circulation pump is arranged in the membrane structure. The circulation pump is arranged on the pipeline between the membrane modules. The circulation pump is communicated with the sewage pipe.

6. The vegetable oil production device according to claim 1, wherein: It further includes a pickling batching tank and an alkali washing batching tank. The pickling batching tank and the alkali washing batching tank are both communicated with the raw material tank. The raw material tank is further provided with a water inlet for communicating with an external water source.

7. The vegetable oil production device according to claim 6, characterized in that: Metering pumps are arranged on the pipeline where the pickling batching tank is communicated with the raw material tank and on the pipeline where the alkali washing batching tank is communicated with the raw material tank.

8. The vegetable oil production device according to claim 1, characterized in that: It further includes a hot air blower. The air outlet of the hot air blower is communicated with the raw material tank.

9. A method for producing vegetable oil by using the vegetable oil production device according to any one of claims 1-8, characterized in that: During the filtering process, it includes the following steps: Step 1: Pour the material into the raw material tank, and open the second valve at the discharge outlet of the raw material tank, the third valve of the filtering component, and the reflux valve at the discharge outlet of the heat exchanger; Step 2: Start the feed pump to convey the material in the raw material tank into the membrane structure, so that the material fills the membrane structure and each pipeline, and discharge the air; Step 3: Open the first valve at the clear liquid outlet of the membrane structure, and start the circulation pump to make the material circulate in each membrane module of the membrane structure; Step 4: Adjust the opening degree of the first valve to make the pressure gauge at the clear liquid outlet of the membrane structure within the working pressure range. Under the action of the transmembrane pressure difference between the circulation pump and the membrane module, the clear liquid of the material entering the membrane module penetrates through the side walls of the membrane tubes in each membrane module; Step 5: The clear liquid flows out from the clear liquid outlet of the membrane structure and is collected. The concentrated liquid remaining in the membrane structure after filtration is heat-exchanged by the heat exchanger and then refluxed to the raw material tank for filtration again. After the filtration is completed, stop the circulation pump and the feeding pump in sequence; During the cleaning process, it includes the following steps: Step 1: Open the first drain valve at the discharge port of the raw material tank to empty the raw material tank, open the second drain valve between the filtration component and the sewage pipe to empty the filtration component, open the third drain valve between the feed pump and the sewage pipe to empty the feed pump, open the fourth drain valve between the discharge port of the membrane structure and the sewage pipe to empty the membrane structure, and open the fifth drain valve between the circulation pump and the sewage pipe to empty the circulation pump; Step 2: Introduce water into the raw material tank through the water inlet, introduce the pickling solution in the pickling ingredient tank and the alkaline cleaning solution in the alkaline cleaning ingredient tank into the raw material tank, open the third valve of the filtration component and the reflux valve at the discharge port of the heat exchanger, and start the feed pump and the circulation pump for cleaning; Step 3: After the cleaning is completed, stop the circulation pump and the feed pump in sequence; Step 4: Turn on the hot air blower to evaporate the moisture inside the device and the pipeline.

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