A device and method for treating wastewater for cellulose production

Abstract

The present invention relates to the technical field of wastewater treatment devices, and proposes a wastewater treatment device and method for cellulose production, including a reactor having a treatment chamber, the treatment chamber having a feed port and a discharge port; a rotating shaft portion rotatably arranged on the reactor, and located in the treatment chamber; a plurality of stirring plates are arranged on the rotating shaft portion, the stirring plates abut against the inner wall of the reactor, and the stirring plates have two symmetrically arranged heating surfaces; a heating element is arranged in the stirring plate, and is located between the two heating surfaces. Through the above technical scheme, the problem that when the wastewater treatment device evaporates and crystallizes in the prior art, the precipitated crystals are easily attached to the inner wall, and the wastewater at the center is not easy to be heated to a suitable temperature is solved.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment devices, and in particular to a wastewater treatment device and method for cellulose production. Background Art

[0002] The wastewater is sodium chloride-containing wastewater from the cellulose production process. It contains sodium chloride and relatively high organic matter, so the COD of the raw water is relatively high, making biochemical treatment very difficult in practical applications. At the same time, cellulose production enterprises are generally small in scale, and it is difficult for enterprises to accept the investment cost of investing a lot of money in advanced oxidation, medium-temperature anaerobic and other processes, and the quality of the enterprise's operation and maintenance personnel is also difficult to meet the operational requirements of complex processes.

[0003] Therefore, it is necessary to develop a high-efficiency, low-energy, and simple-to-operate cellulose wastewater treatment device. The original treatment device uses a typical chemical unit operation process to heat the wastewater to make it boil and vaporize. The vaporized steam is condensed through condensation, and the evaporated steam is recovered and compressed by the compressor so that it can be reused as a heat source. After the evaporation is completed, the sodium chloride in the solution can be precipitated in solid form, thereby completing the wastewater treatment operation.

[0004] However, the original treatment device has the following problems: when the wastewater treatment device is heated and the wastewater is evaporated and crystallized, the precipitated crystals are easily attached to the inner wall, and it is inconvenient to discharge the extracted product after the crystallization is completed. At the same time, during the crystallization process, the resistance wire on the inner wall is usually used for heating, and the wastewater near the center of the wastewater treatment device is less likely to be heated to a suitable temperature than the wastewater near the inner wall, making it inconvenient to evaporate and crystallize it efficiently. Summary of the invention

[0005] The present invention provides a wastewater treatment device and method for cellulose production, which solves the problem in the related art that when the wastewater treatment device evaporates and crystallizes, the precipitated crystals are easily attached to the inner wall, and the wastewater at the center is not easy to be heated to a suitable temperature.

[0006] The technical solution of the present invention is as follows:

[0007] A cellulose production wastewater treatment device, comprising:

[0008] A reactor, wherein the reactor has a processing chamber, and the processing chamber has a feed inlet and a discharge outlet;

[0009] A rotating shaft portion, the rotating shaft portion is rotatably disposed on the reaction kettle and is located in the processing chamber;

[0010] A plurality of stirring plates, each of which is arranged on the rotating shaft, the stirring plates abut against the inner wall of the reaction kettle, and the stirring plates have two symmetrically arranged heating surfaces;

[0011] A heating element is arranged in the stirring plate and between the two heating surfaces.

[0012] As a further technical solution, one end of the stirring plate abuts against the inner wall of the reactor, and a plurality of the stirring plates divide the processing chamber into a plurality of processing areas, and a processing area is formed between the heating surfaces of two adjacent stirring plates and the inner wall of the reactor.

[0013] As a further technical solution, the stirring plate is rectangular, one side of the stirring plate is in contact with the inner wall of the reactor, the stirring plate has an installation cavity, the installation cavity is located between the two heating surfaces, the heating element is a resistance wire, and there are several heating elements, and the several heating elements are arranged at intervals in the installation cavity.

[0014] As a further technical solution, the rotating shaft and the reactor are both cylindrical, the rotating shaft and the reactor are coaxially arranged, and there are four stirring plates, which are fixedly arranged around the rotating shaft.

[0015] As a further technical solution, the length direction of the heating surface is parallel to the rotation axis of the shaft portion, and further includes:

[0016] A cleaning piece is movably arranged in the processing area, the moving direction of the cleaning piece is parallel to the axial direction of rotation of the rotating shaft portion, and the cleaning piece is used to clean the heating surface.

[0017] As a further technical solution, the top and bottom of the processing area are provided with arc-shaped slideways, and the arc-shaped slideways of several processing areas form an annular slideway, further comprising:

[0018] A guide rod, both ends of which respectively penetrate the arc-shaped slideways at the top and bottom of the processing area, the cleaning piece is movably arranged on the guide rod, and the stirring plate is used to abut and push the guide rod to slide in the annular slideway after rotating with the rotating shaft.

[0019] As a further technical solution, the cleaning piece is sleeved on the guide rod and threadedly connected to the guide rod. One end of the guide rod and the annular slide both have toothed portions, which are meshed with each other. After the guide rod slides in the annular slide, the guide rod rotates to drive the cleaning piece to move.

[0020] As a further technical solution, the two heating surfaces of the stirring plate are provided with linear guide grooves, the length direction of the guide rod is parallel to the rotation axis of the shaft portion, and the cleaning member comprises:

[0021] A support ring, wherein the support ring is sleeved on the guide rod and is threadedly connected to the guide rod, and after the stirring plate rotates following the rotating shaft portion, the support ring abuts against or cancels abutment against the linear guide groove;

[0022] A cleaning rod is arranged on the support ring and is used for abutting against and following the support ring to move and clean the heating surface.

[0023] As a further technical solution, there are two cleaning rods, which are symmetrically arranged and used to clean the heating surfaces of two adjacent stirring plates.

[0024] A method for treating wastewater from cellulose production, using the above-mentioned device for treating wastewater from cellulose production, comprises the following steps:

[0025] S1. Feeding: feeding wastewater into the treatment chamber from the feed inlet;

[0026] S2, evaporation crystallization: start the heating element and drive the shaft to rotate;

[0027] S3, discharge: open the discharge port.

[0028] The working principle and beneficial effects of the present invention are:

[0029] In the present invention, the wastewater treatment device acts on the MVR evaporation crystallization system, which is the most energy-saving evaporation process at present. During the evaporation process, the evaporated steam is recovered and recompressed by the compressor, so that it can be reused as a heat source. Specifically, the sodium chloride-containing wastewater is sent to the wastewater treatment device for evaporation and concentration after being preheated by the evaporated condensed water. When the wastewater concentration reaches saturation, sodium chloride solid begins to precipitate. The slurry in the wastewater treatment device is pumped to the thickener, buffered and fed to the centrifuge for filtration. The mother liquor after filtration returns to the evaporator for continued evaporation. The solid obtained by filtration is the final product of sodium chloride in this treatment process; at the same time, the secondary steam evaporated by the wastewater treatment device is sent to the compressor for recompression. The steam with increased temperature is condensed into condensed water. After preheating the feed wastewater, it is discharged from the system for secondary utilization in the workshop.

[0030] The whole system has the characteristics of strong adaptability, low energy consumption, high quality of by-product salt and less staffing. Since the main equipment uses several groups of wastewater treatment devices and adopts a multi-stage forced circulation evaporator, it can adapt to the evaporation and crystallization of salt wastewater of any concentration, and the evaporation rate is not affected by the salt content; the front and rear sides of the stirring plate in the device have large heating surfaces to achieve a large heat exchange area, and multi-stage evaporation is adopted, the compression temperature rise of the compressor is lower, thereby lowering the operating cost and achieving the best balance with fixed investment; the sodium chloride produced by the device is large and uniform, easy to filter, low in water content, white and high in quality, and can be directly sold as a by-product; and the system adopts PLC full-process automatic control, which greatly reduces the labor intensity and employment costs of workers.

[0031] Specifically, the wastewater treatment device uses a stirring plate and a rotating shaft to coordinate the wastewater so that the wastewater is fully mixed in the treatment chamber, thereby avoiding the situation where the wastewater in the center position cannot be heated; at the same time, in order to greatly improve the heating efficiency, it is impossible to achieve this by relying solely on the resistance wire on the inner wall of a traditional reactor. Therefore, the upper stirring plate is used, and with the help of the part in contact with the wastewater, two heating surfaces are symmetrically arranged on the front and rear sides thereof, and a heating element powered by a power supply for heating the two heating surfaces is installed inside the stirring plate, and the heating element is located between the two heating surfaces so that the two heating surfaces can be quickly heated at the same time.

[0032] At the same time, in order to solve the problem that the precipitated crystals are easily attached to the inner wall, the stirring plate is used again to abut against the inner wall of the reactor. Then, when the shaft drives several stirring plates to rotate, the scraping part abutting against the inner wall can scrape off the sodium chloride crystals.

[0033] The working principle of the wastewater treatment device is as follows: first, 20m / h of saline wastewater, mainly sodium chloride, is introduced into the treatment chamber of the reactor from the feed port, and then heating is started for evaporation and crystallization operation, and the resistance wire heating element on the inner wall of the reactor and the inside of the stirring plate is energized, and a large amount of heat is generated to heat up and evaporate the wastewater. At the same time, the motor drives the rotating shaft to drive several stirring plates to rotate and stir the wastewater in the reactor, ensuring that the wastewater is heated evenly during the treatment process, avoiding local overheating, and improving the uniformity of heating and the effect of wastewater treatment; finally, sodium chloride crystals are precipitated, and the discharge port valve is opened to discharge the material, and the subsequent process is carried out, which simplifies the operation process of wastewater treatment and reduces the difficulty of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0035] Figure 1 It is a schematic diagram of the structure of the cellulose wastewater treatment system in the present invention;

[0036] Figure 2 This is a schematic structural diagram of a wastewater treatment device for cellulose production in the present invention;

[0037] Figure 3 This is a schematic diagram of the internal structure of a wastewater treatment device for cellulose production in the present invention;

[0038] Figure 4 This is a schematic diagram of the structure of the stirring plate in the present invention from the first perspective;

[0039] Figure 5 For the present invention Figure 4 Enlarged view of part A in the middle;

[0040] Figure 6 This is a schematic diagram of the structure of the stirring plate in the present invention from a second viewing angle;

[0041] Figure 7 For the present invention Figure 4 Enlarged view of middle part B;

[0042] Figure 8 For the present invention Figure 6 Enlarged view of part C in the middle.

[0043] In the figure: 1. Reactor, 101. Processing chamber, 102. Feed port, 103. Discharge port, 104. Processing area, 105. Annular slide, 2. Rotating shaft, 3. Stirring plate, 301. Heating surface, 302. Mounting chamber, 303. Linear guide groove, 4. Heating element, 5. Cleaning element, 501. Support ring, 502. Cleaning rod, 6. Guide rod, 7. Tooth portion. DETAILED DESCRIPTION

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0045] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0046] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0048] Reference Figure 1 to Figure 8 , which is the first embodiment of the present invention, proposes a wastewater treatment device for cellulose production, including: a reactor 1, the reactor 1 has a processing chamber 101, the processing chamber 101 has a feed port 102 and a discharge port 103; a rotating shaft portion 2, the rotating shaft portion 2 is rotatably arranged on the reactor 1 and is located in the processing chamber 101; a plurality of stirring plates 3, the plurality of stirring plates 3 are all arranged on the rotating shaft portion 2, the stirring plates 3 are in contact with the inner wall of the reactor 1, and the stirring plates 3 have two symmetrically arranged heating surfaces 301; a heating element 4, the heating element 4 is arranged in the stirring plate 3 and is located between the two heating surfaces 301.

[0049] In this embodiment, Figures 1 to 3 As shown, the wastewater treatment device acts on the MVR evaporation crystallization system, which is the most energy-saving evaporation process at present. During the evaporation process, the evaporated steam is recovered and compressed by the compressor, so that it can be reused as a heat source. Specifically, the sodium chloride-containing wastewater is preheated by the evaporated condensed water and then sent to the wastewater treatment device for evaporation and concentration. When the wastewater concentration reaches saturation, sodium chloride solid begins to precipitate. The slurry in the wastewater treatment device is pumped to the thickener, buffered and fed to the centrifuge for filtration. The mother liquor after filtration returns to the evaporator for continued evaporation. The solid obtained by filtration is the final product of sodium chloride in this treatment process; at the same time, the secondary steam evaporated from the wastewater treatment device is sent to the compressor for recompression. The steam with increased temperature is condensed into condensed water. After preheating the feed wastewater, it is discharged from the system for secondary utilization in the workshop.

[0050] The whole system has the characteristics of strong adaptability, low energy consumption, high quality of by-product salt and less staffing. Since the main equipment uses several groups of wastewater treatment devices and adopts a multi-stage forced circulation evaporator, it can adapt to the evaporation and crystallization of salt wastewater with any concentration, and the evaporation rate is not affected by the salt content; the front and rear sides of the stirring plate 3 in the device are both provided with a large heating surface 301, which realizes a large heat exchange area, and adopts multi-stage evaporation, and the compression temperature rise of the compressor is lower, so that the operating cost is low, and the best balance is achieved with the fixed investment; the sodium chloride particles produced by the device are large and uniform, easy to filter, low in water content, white and high in quality, and can be directly sold as a by-product; and the system adopts PLC full-process automatic control, which greatly reduces the labor intensity and employment costs of workers.

[0051] Specifically, the wastewater treatment device uses the stirring plate 3 and the rotating shaft portion 2 in coordination, so that the wastewater is fully mixed in the treatment chamber 101, thereby avoiding the situation where the wastewater in the center position cannot be heated; at the same time, in order to greatly improve the heating efficiency, it is impossible to achieve this by relying solely on the resistance wire on the inner wall of the traditional reactor 1, so the upper stirring plate 3 is used, and with the help of its contact with the wastewater, two heating surfaces 301 are symmetrically arranged on the front and rear sides thereof, and a heating element 4 powered by a power supply for heating the two heating surfaces 301 is installed inside the stirring plate 3, and it is located between the two heating surfaces 301, so that the two heating surfaces 301 can be quickly heated at the same time.

[0052] At the same time, in order to solve the problem that the precipitated crystals are easily attached to the inner wall, the stirring plate 3 is used again to abut against the inner wall of the reactor 1, and then when the shaft part 2 drives a plurality of stirring plates 3 to rotate, the scraping part abutting against the inner wall can scrape off the sodium chloride crystals.

[0053] The working principle of the wastewater treatment device is as follows: first, 20m / h of saline wastewater, mainly sodium chloride, is introduced into the treatment chamber 101 of the reactor 1 from the feed port 102, and then heating is started for evaporation and crystallization operation, and the resistance wire heating element 4 on the inner wall of the reactor 1 and the stirring plate 3 is energized, and a large amount of heat is generated to heat up and evaporate the wastewater. At the same time, the motor drives the rotating shaft part 2 to drive several stirring plates 3 to rotate and stir the wastewater in the reactor 1, ensuring that the wastewater is heated evenly during the treatment process, avoiding local overheating, and improving the uniformity of heating and the effect of wastewater treatment; finally, sodium chloride crystals are precipitated, and the discharge port 103 valve is opened to discharge the material, and the subsequent process is carried out, which simplifies the operation process of wastewater treatment and reduces the difficulty of operation.

[0054] Furthermore, one end of the stirring plate 3 abuts against the inner wall of the reactor 1 , and the plurality of stirring plates 3 divide the processing chamber 101 into a plurality of processing areas 104 . A processing area 104 is formed between the heating surfaces 301 of two adjacent stirring plates 3 and the inner wall of the reactor 1 .

[0055] In this embodiment, Figures 1 to 3 As shown, in order to achieve the stirring effect, the stirring plate 3 can be in many forms to achieve the above purpose, but in order to ensure that the sodium chloride crystals precipitated on the inner wall of the reactor 1 are completely scraped off, one end or the right-angled side of the stirring plate 3 in the form of a rectangle or square is completely in contact with the inner wall of the reactor 1. Only after the shaft portion 2 is driven, most of the sodium chloride crystals can be scraped off. Therefore, each stirring plate 3 will divide the processing chamber 101 into a plurality of processing areas 104, and one of the processing areas 104 is formed between the heating surfaces 301 of two adjacent stirring plates 3 and the inner wall of the reactor 1.

[0056] Furthermore, the stirring plate 3 is rectangular, one side of the stirring plate 3 is in contact with the inner wall of the reactor 1, the stirring plate 3 has an installation cavity 302, the installation cavity 302 is located between the two heating surfaces 301, the heating element 4 is a resistance wire, and there are several heating elements 4, and the several heating elements 4 are arranged in the installation cavity 302 at intervals.

[0057] In this embodiment, Figures 1 to 3 As shown, a rectangular stirring plate 3 is specifically used, one side of which is in contact with the inner wall of the reactor 1, and the stirring plate 3 is welded to the rotating shaft portion 2. In order to provide an installation position for the heating element 4, power is supplied to the heating surfaces 301 on the front and rear sides to provide heat, and to avoid leakage from contact with waste water, an installation cavity 302 is opened in the physical part of the stirring plate 3 between the two heating surfaces 301, in which a power supply and a plurality of groups of resistance wires arranged at intervals are installed.

[0058] Furthermore, the rotating shaft portion 2 and the reactor 1 are both cylindrical, the rotating shaft portion 2 and the reactor 1 are coaxially arranged, and there are four stirring plates 3 , which are fixedly arranged around the rotating shaft portion 2 .

[0059] In this embodiment, Figures 1 to 3 As shown, a coaxial rotating shaft portion 2 and a reactor 1 are specifically used, and the two operate more smoothly. At the same time, it is ensured that a plurality of groups of stirring plates 3 welded to the rotating shaft portion 2 will not interfere with the inner wall of the reactor 1 under the drive of the stirring plates 3, and the crystal scraping operation is normally completed; and four groups of stirring plates 3 are welded, which are arranged along the circumference of the rotating shaft portion 2, thereby greatly improving the mixing effect.

[0060] Furthermore, the length direction of the heating surface 301 is parallel to the rotation axis of the shaft portion 2 , and also includes: a cleaning piece 5 , which is movably arranged in the processing area 104 , and the moving direction of the cleaning piece 5 is parallel to the rotation axis of the shaft portion 2 , and the cleaning piece 5 is used to clean the heating surface 301 .

[0061] In this embodiment, Figures 4 to 8As shown, it is further considered that after using several groups of stirring plates 3, there will be precipitated sodium chloride crystals on the heating surfaces 301 on the front and rear sides thereof, and it is inconvenient to scrape them off. Therefore, a cleaning piece 5 is movably installed in each processing area 104 to clean and scrape off the sodium chloride crystals on the heating surface 301. Specifically, a movable scraper can be installed on the heating surface 301, but an additional power source is required. It is also arranged that the length direction of the heating surface 301 and the moving direction of the cleaning piece 5 are parallel to the rotation axis of the shaft portion 2, so as to realize a quick cleaning action and facilitate the subsequent power connection with the shaft portion 2, so that no additional power source is required to drive the cleaning piece 5.

[0062] Furthermore, the top and bottom of the processing area 104 are provided with arc slides, and the arc slides of several processing areas 104 form an annular slide 105, which also includes: a guide rod 6, both ends of the guide rod 6 respectively pass through the arc slides at the top and bottom of the processing area 104, and the cleaning piece 5 is movably set on the guide rod 6. After the stirring plate 3 rotates with the rotating shaft part 2, it is used to abut and push the guide rod 6 to slide in the annular slide 105.

[0063] In this embodiment, Figures 4 to 8 As shown, although the action of the cleaning member 5 is easy to achieve, another problem is that it may interfere with several groups of stirring plates 3 rotating with the shaft portion 2, thereby making it impossible to perform the stirring action. Therefore, a guide rod 6 is first installed to provide a guide for the movement of the cleaning member 5. At the same time, the guide rod 6 can move around the shaft portion 2 with the stirring plate 3, so an arc-shaped slideway for the guide rod 6 to pass through is further provided inside and at the bottom of the processing area 104. The arc-shaped slideway of each processing area 104 can form an annular slideway 105 for the guide rod 6 to slide in a circle around the shaft portion 2, thereby moving the cleaning member 5 set on the guide rod 6. On the one hand, it can be guided to perform the cleaning action of the heating surface 301, and on the other hand, it will not affect the rotation of the stirring plate 3; but moving the cleaning member 5 set on the guide rod 6 may also require the additional setting of a power source, which can be achieved by setting it on the guide rod 6.

[0064] Furthermore, the cleaning piece 5 is sleeved on the guide rod 6 and is threadedly connected to the guide rod 6. One end of the guide rod 6 and the annular slide 105 both have a tooth portion 7, which are meshed. After the guide rod 6 slides in the annular slide 105, the guide rod 6 rotates to drive the cleaning piece 5 to move.

[0065] In this embodiment, Figures 4 to 8As shown, in order to avoid the setting of an additional power source and save costs, the moving power of the cleaning member 5 is taken from the rotational force of the rotating shaft portion 2. Therefore, the cleaning member 5 is sleeved on the guide rod 6, and the two are threadedly connected, and the tooth portion 7 in the annular slide 105 is engaged with the tooth portion 7 of the guide rod 6, so that the stirring plate 3 can follow the rotation of the rotating shaft portion 2 until it abuts against the guide rod 6, and then it can be achieved that the stirring plate 3 can continue to push the guide rod 6 to slide in the annular slide 105. During the process, the guide rod 6 rotates, and the cleaning member 5 moves axially along the guide rod 6 to clean the heating surface 301.

[0066] Furthermore, the two heating surfaces 301 of the stirring plate 3 both have linear guide grooves 303, and the length direction of the guide rod 6 is parallel to the rotation axis of the shaft portion 2. The cleaning component 5 includes: a support ring 501, which is sleeved on the guide rod 6 and threadedly connected to the guide rod 6. After the stirring plate 3 rotates following the shaft portion 2, the support ring 501 abuts against or cancels the abutment against the linear guide groove 303; a cleaning rod 502, which is arranged on the support ring 501 and is used to abut and follow the support ring 501 to move and clean the heating surface 301.

[0067] In this embodiment, Figures 4 to 8 As shown, specifically, the cleaning member 5 is composed of a support ring 501 and a cleaning rod 502. The support ring 501 passes through the guide rod 6 and is threadedly connected thereto to provide support for the cleaning rod 502. At the same time, when the guide rod 6 is pushed by the stirring plate 3, in order to ensure the freedom of movement of the cleaning member 5 so that the movement of the cleaning member 5 can be completed smoothly, a linear guide groove 303 is opened on the heating surface 301 to adapt to the shape of the support ring 501. In the above process, the support ring 501 will be limited by the linear guide groove 303, and driven by the self-rotation of the guide rod 6, it drives the cleaning rod 502 to abut and scrape off the sodium chloride crystals on the heating surface 301.

[0068] At the same time, after the cleaning member 5 moves to the bottom of the guide rod 6, the cleaning action of the heating surface 301 on one side of the processing area 104 is completed, and the other side also needs to be cleaned, so the shaft portion 2 still needs to be driven in the reverse direction to make the stirring plate 3 on the other side push the guide rod 6 to slide in the reverse direction, and under the action of the threaded connection, the cleaning rod 502 at the bottom moves upward again to scrape off the sodium chloride crystals on the heating surface 301 on the other side.

[0069] Furthermore, there are two cleaning rods 502 , which are symmetrically arranged, and the two cleaning rods 502 are used to clean the heating surfaces 301 of two adjacent stirring plates 3 .

[0070] In this embodiment, Figures 4 to 8As shown, in order to adapt to the angles of the heating surfaces 301 on different sides within a processing area 104 and to facilitate the support ring 501 to drive the cleaning rods 502 to clean the sodium chloride crystals, two groups of cleaning rods 502 are symmetrically welded on a support ring 501, and the two cleaning rods 502 are used to clean the heating surfaces 301 of two adjacent stirring plates 3.

[0071] A method for treating wastewater from cellulose production, using the above-mentioned device for treating wastewater from cellulose production, comprises the following steps:

[0072] S1, feeding: feeding wastewater into the treatment chamber 101 from the feed inlet 102;

[0073] S2, evaporation crystallization: start the heating element 4 and drive the shaft part 2 to rotate;

[0074] S3, discharging: opening the discharging port 103.

[0075] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A cellulose production wastewater treatment device, characterized in that: include: A reaction kettle (1), the reaction kettle (1) comprising a processing chamber (101), the processing chamber (101) comprising a feed inlet (102) and a discharge outlet (103); A rotating shaft portion (2), the rotating shaft portion (2) being rotatably disposed on the reaction kettle (1) and located in the processing chamber (101); A plurality of stirring plates (3), wherein the plurality of stirring plates (3) are all arranged on the rotating shaft portion (2), the stirring plates (3) abut against the inner wall of the reaction kettle (1), and the stirring plates (3) have two symmetrically arranged heating surfaces (301); A heating element (4), the heating element (4) being arranged inside the stirring plate (3) and located between the two heating surfaces (301); One end of the stirring plate (3) abuts against the inner wall of the reaction kettle (1), and a plurality of the stirring plates (3) divide the processing chamber (101) into a plurality of processing areas (104), and a processing area (104) is formed between the heating surfaces (301) of two adjacent stirring plates (3) and the inner wall of the reaction kettle (1); The stirring plate (3) is rectangular, one side of the stirring plate (3) is in contact with the inner wall of the reaction kettle (1), the stirring plate (3) has a mounting cavity (302), the mounting cavity (302) is located between the two heating surfaces (301), the heating element (4) is a resistance wire, and there are a plurality of heating elements (4), and the plurality of heating elements (4) are arranged in an interval manner in the mounting cavity (302); The length direction of the heating surface (301) is parallel to the rotation axis of the rotating shaft portion (2), and further comprises: a cleaning piece (5), the cleaning piece (5) being movably arranged in the processing area (104), the moving direction of the cleaning piece (5) being parallel to the rotation axis of the rotating shaft portion (2), and the cleaning piece (5) being used to clean the heating surface (301); The processing area (104) has arc-shaped slideways at the top and bottom, and the arc-shaped slideways of a plurality of the processing areas (104) form an annular slideway (105), further comprising: a guide rod (6), the two ends of the guide rod (6) respectively passing through the arc-shaped slideways at the top and bottom of the processing area (104); the cleaning member (5) is movably arranged on the guide rod (6); and the stirring plate (3) is used to abut against and push the guide rod (6) to slide in the annular slideway (105) after rotating following the rotating shaft portion (2); The cleaning member (5) is sleeved on the guide rod (6) and is threadedly connected to the guide rod (6). One end of the guide rod (6) and the inside of the annular slideway (105) both have toothed portions (7), which mesh with each other. After the guide rod (6) slides in the annular slideway (105), the guide rod (6) rotates to drive the cleaning member (5) to move. The two heating surfaces (301) of the stirring plate (3) both have linear guide grooves (303), the length direction of the guide rod (6) is parallel to the rotation axis of the rotating shaft portion (2), and the cleaning member (5) comprises: a support ring (501), the support ring (501) being sleeved on the guide rod (6) and being threadedly connected to the guide rod (6); after the stirring plate (3) rotates following the rotating shaft portion (2), the support ring (501) abuts against or cancels abutment against the linear guide groove (303); A cleaning rod (502), the cleaning rod (502) being arranged on the support ring (501) and being used for abutting against and following the movement of the support ring (501) to clean the heating surface (301).

2. A cellulose production wastewater treatment device according to claim 1, characterized in that: The rotating shaft portion (2) and the reaction kettle (1) are both cylindrical, the rotating shaft portion (2) and the reaction kettle (1) are coaxially arranged, and there are four stirring plates (3), which are fixedly arranged around the rotating shaft portion (2).

3. A cellulose production wastewater treatment device according to claim 1, characterized in that: There are two cleaning rods (502), which are symmetrically arranged, and the two cleaning rods (502) are used to clean the heating surfaces (301) of two adjacent stirring plates (3).

4. A method for treating wastewater from cellulose production, using a cellulose production wastewater treatment device according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1, feeding: feeding wastewater into the treatment chamber (101) from the feed inlet (102); S2, evaporation and crystallization: starting the heating element (4) and driving the rotating shaft (2) to rotate; S3, discharge: open the discharge port (103).

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