MVR evaporator

Abstract

The application discloses an MVR evaporator and relates to the field of evaporators, and aims to solve the problem of dirt accumulation on the inner wall of an evaporation channel; the technical scheme is as follows: the MVR evaporator comprises an evaporation chamber, the evaporation chamber comprises a liquid injection section, an evaporation section and a liquid storage section, the evaporation section comprises a plurality of vertically arranged channels for steam flow, a scraping assembly is arranged in each channel, the scraping assembly is slidingly connected to the inner wall of the channel, a gas release structure is arranged at the top of the channel, when steam in the channel is accumulated at the bottom of the scraping assembly and the steam pressure is greater than the gravity of the scraping assembly, the scraping assembly is lifted to the top of the channel to scrape the wall upwards, when the scraping assembly reaches the gas release structure, the gas release structure releases the steam accumulated at the bottom of the scraping assembly and controls the scraping assembly to drop to the bottom of the channel to scrape the wall downwards. The MVR evaporator has the advantages of large effective evaporation area and steam channel cleaning.

Description

Technical Field

[0001] This invention relates to the field of evaporator technology, and more specifically, to an MVR evaporator. Background Technology

[0002] MVR, short for Mechanical Vapor Recompression, is an energy-saving technology that reuses the energy of secondary steam generated within the system itself, thereby reducing the demand for external energy. The process involves compressing low-temperature steam using a compressor to increase its temperature, pressure, and enthalpy. This compressed steam then enters a heat exchanger to heat the solution to be treated, fully utilizing the latent heat of the steam. The heated solution evaporates in an evaporator, producing low-temperature steam, which is then pressurized by a steam compressor to become heating steam. This cycle of evaporation continues, concentrating the solution during the process. High-concentration saline wastewater is typically treated using evaporation crystallization, which first requires wastewater concentration. Traditional methods, such as reaction kettles, single-effect evaporators, and multi-effect evaporation systems, are commonly used. However, these systems suffer from complex equipment and high energy consumption. MVR technology, with its simple structure and low energy consumption, shows promising application prospects in the treatment of high-concentration saline wastewater.

[0003] However, during the evaporation and concentration process, high-concentration saline wastewater can easily cause crystallized salts and dirt to deposit on the pipe walls of the heat exchanger, leading to system blockage or reduced evaporation efficiency.

[0004] In existing technologies, corresponding solutions have been provided to address this problem. For example, Chinese patent CN117244261B describes an anti-clogging flow channel structure for the evaporation chamber of an MVR falling film evaporator. This structure includes a sealed chamber, which, from top to bottom, comprises a liquid injection section, an evaporation section, and a liquid storage section. It also includes several vertically parallel heat exchange plates, a moving plate guide assembly, a moving plate drive assembly, and a distribution groove assembly. This structure effectively prevents clogging of the evaporation chamber flow channel, facilitating automatic, timed cleaning of the heating surface of the heat exchange plates during evaporator operation. This prevents scale buildup on the heating surface, maintains good thermal conductivity of the heat exchange plates, and allows for controllable high-temperature steam flow path within the heat exchange plate steam chamber. This effectively ensures balanced heat distribution on the heating surface of the heat exchange plates, resulting in high heating efficiency and stable solution flow. Furthermore, the large heating and effective evaporation surfaces of this structure help reduce the volume of the evaporation chamber, improve heating, evaporation, and concentration efficiency, and further enhance the energy-saving performance of the evaporator.

[0005] This invention proposes a new solution to this problem. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the purpose of this invention is to provide an MVR evaporator with the advantages of large effective evaporation area and the ability to clean the inner wall of the steam channel.

[0007] The above-mentioned technical objective of the present invention is achieved through the following technical solution: an MVR evaporator, comprising an evaporation chamber, the evaporation chamber including a liquid injection section, an evaporation section and a liquid storage section, the evaporation section including a plurality of vertically arranged channels for steam flow, each channel being provided with a scraping component, the scraping component being slidably connected to the inner wall of the channel, the top of the channel being provided with a venting structure, when steam accumulates at the bottom of the scraping component in the channel and the steam pressure is greater than the weight of the scraping component, the scraping component is lifted to the top of the channel for upward scraping of the wall; when the scraping component reaches the venting structure, the venting structure discharges the steam accumulated at the bottom of the scraping component and controls the scraping component to fall to the bottom of the channel to achieve downward scraping of the wall.

[0008] By adopting the above technical solution, this MVR evaporator has the advantages of a large effective evaporation area and easy cleaning of the steam channel. When the sewage in the injection section is heated by the evaporation section, the water in the sewage can be converted into water vapor. The water vapor can rise through the channel to the storage section. After cooling, the water vapor in the storage section can be converted into condensate, which greatly reduces its harmful components compared to sewage. In addition, since sewage is evaporated, it will carry some pollutants, which will cause dirt on the inner wall of the channel over time. Because this evaporator is equipped with a scraping component and a venting structure in the channel, when the steam in the channel accumulates at the bottom of the scraping component and the steam pressure is greater than the weight of the scraping component, it will lift the scraping component to the top of the channel for upward scraping. When the scraping component reaches the venting structure, the venting structure will discharge the steam accumulated at the bottom of the scraping component and control the scraping component to fall to the bottom of the channel to achieve downward scraping. By using the up and down movement of the scraping component, the dirt on the inner wall of the channel can be scraped off and fallen into the sewage in the injection section.

[0009] The present invention is further configured such that: the channel has an irregular cross-section, and the cross-sectional shape of the channel includes at least petal shape, ellipse shape, and polygon shape.

[0010] By adopting the above technical solution and using a non-circular irregular cross-section, it has a larger contact surface area, which can improve the thermal energy utilization efficiency.

[0011] The present invention is further configured such that: the scraping component includes a ring scraper and a dome, the dome is located in the middle of the ring scraper, a steam accumulation chamber is formed at the bottom of the dome, and the outer cross section of the ring scraper is adapted to the cross section of the channel.

[0012] By adopting the above technical solution, the annular scraper is the main structure for scraping off pollutants, and the dome is used to enhance the steam lifting and gathering effect, thereby quickly pushing the scraping component upward.

[0013] The present invention is further configured such that: a plurality of scraping speed control holes are provided at the annular scraping part, and the plurality of scraping speed control holes are respectively used for the partial steam outflow in the channel.

[0014] By adopting the above technical solution, when the steam velocity rises too fast, the function of the scraping speed control hole is realized, and the steam pressure at the bottom of the scraping component can be reduced by the pressure relief through the scraping speed control hole.

[0015] The present invention is further configured such that: a top plate is fixed to the top of the evaporation section, a bottom plate is fixed to the bottom of the evaporation section, and the venting structure includes a branch pipe and a connecting end, wherein the branch pipe is fixed to the top of the evaporation section through the connecting end.

[0016] By adopting the above technical solution, when the scraping component rises to the top, the branch pipe in the venting structure can quickly discharge the water vapor accumulated at the bottom of the scraping component, thereby causing the steam pressure to be less than the weight of the scraping component and controlling the scraping component to fall downward.

[0017] The present invention is further configured such that: a bottom protrusion is fixed at the bottom of the channel, and a lower impact spring is fixed at the top of the bottom protrusion.

[0018] By adopting the above technical solution, when the scraping component falls to the bottom, it will contact the lower impact spring at the top of the bottom protrusion, achieving an impact that can vibrate and remove the dirt from the surface of the scraping component.

[0019] The present invention is further configured such that: a top protrusion is fixed to the top of the channel, and an upper impact spring is fixed to the bottom of the top protrusion.

[0020] By adopting the above technical solution, when the scraping component moves upward to the top of the channel, it will contact the upper impact spring on the top of the top protrusion, thereby achieving an impact and vibrating off the dirt on the surface of the scraping component.

[0021] The present invention is further configured such that: the injection section is connected to an industrial wastewater injection pipe, the storage section is connected to a storage pipe, and the evaporation section is connected to a steam pipe.

[0022] By adopting the above technical solutions, industrial wastewater injection pipelines facilitate the injection of sewage, steam pipelines can provide an external heat source, and liquid storage pipelines can realize water recycling.

[0023] In summary, the present invention has the following beneficial effects:

[0024] This MVR evaporator has the advantages of a large effective evaporation area and easy cleaning of the steam passage. When the wastewater in the injection section is heated by the evaporation section, the water in the wastewater can be converted into water vapor. The water vapor can rise through the passage to the storage section. After cooling, the water vapor in the storage section can become condensate, which greatly reduces its harmful components compared to wastewater. In addition, since the evaporator is evaporating wastewater, it will carry some pollutants, which will cause dirt to accumulate on the inner wall of the passage over time. Because this evaporator is equipped with a scraping component and a venting structure in the passage, when the steam in the passage accumulates at the bottom of the scraping component and the steam pressure is greater than the weight of the scraping component, it will lift the scraping component to the top of the passage for upward scraping of the wall. When the scraping component reaches the venting structure, the venting structure will discharge the steam accumulated at the bottom of the scraping component and control the scraping component to fall to the bottom of the passage for downward scraping of the wall. By using the up and down movement of the scraping component, the dirt on the inner wall of the passage can be scraped off and dropped into the wastewater in the injection section. Attached Figure Description

[0025] Figure 1 This is one of the structural schematic diagrams of the present invention;

[0026] Figure 2 This is the second structural schematic diagram of the present invention;

[0027] Figure 3 This is a schematic diagram of the evaporation chamber of the present invention;

[0028] Figure 4 This is one of the structural cross-sectional views of the evaporation chamber of the present invention;

[0029] Figure 5 This is a second structural cross-sectional view of the evaporation chamber of the present invention;

[0030] Figure 6 for Figure 5 Enlarged view of point A in the image.

[0031] In the diagram: 1. Evaporation chamber; 11. Liquid injection section; 12. Evaporation section; 13. Liquid storage section; 121. Channel; 2. Scraping assembly; 3. Venting structure; 21. Ring scraper; 22. Dome top; 23. Scraping speed control hole; 122. Top plate; 123. Bottom plate; 31. Branch pipe; 32. Connecting end; 24. Bottom protrusion; 25. Lower impact spring; 26. Top protrusion; 27. Upper impact spring; 111. Industrial wastewater injection pipe; 131. Liquid storage pipe; 124. Steam pipe. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] refer to Figures 1 to 6An MVR evaporator includes an evaporation chamber 1, which includes a liquid injection section 11, an evaporation section 12, and a liquid storage section 13. The evaporation section 12 includes several vertically arranged channels 121 for steam flow. Each channel 121 is equipped with a scraping component 2, which is slidably connected to the inner wall of the channel 121. A venting structure 3 is provided at the top of the channel 121. When steam accumulates at the bottom of the scraping component 2 in the channel 121 and the steam pressure is greater than the weight of the scraping component 2, the scraping component 2 is lifted to the top of the channel 121 for upward scraping. When the scraping component 2 reaches the venting structure 3, the venting structure 3 discharges the steam accumulated at the bottom of the scraping component 2 and controls the scraping component 2 to fall to the bottom of the channel 121 for downward scraping. This MVR evaporator has the advantages of a large effective evaporation area and easy cleaning of the steam channel 121. When the wastewater in the injection section 11 is heated by the evaporation section 12, the water in the wastewater can be converted into water vapor. The water vapor can rise through the channel 121 to the storage section 13. After cooling, the water vapor in the storage section 13 can become condensate, which greatly reduces its harmful components compared to wastewater. In addition, since the evaporator is wastewater, it will carry some pollutants, which will cause dirt to accumulate on the inner wall of the channel 121 over time. Because this evaporator has a large effective evaporation area and easy cleaning of the steam channel 121, the water vapor in the storage section 121 can be cleaned. Scraping components 2 and venting structures 3 are installed at 21 locations. When steam accumulates at the bottom of scraping components 2 in channel 121 and the steam pressure is greater than the weight of scraping components 2, scraping components 2 will be lifted to the top of channel 121 for upward scraping of the wall. When scraping components 2 reach venting structures 3, venting structures 3 will discharge the steam accumulated at the bottom of scraping components 2 and control scraping components 2 to fall to the bottom of channel 121 to achieve downward scraping of the wall. By using the upward and downward movement of scraping components 2, the dirt on the inner wall of channel 121 can be scraped off and fall into the sewage in injection section 11.

[0034] refer to Figures 1 to 6 The channel 121 has an irregular cross-section, and its cross-sectional shape includes at least petal-shaped, elliptical, and polygonal shapes. By adopting a non-circular irregular cross-section, it has a larger contact surface area, which can improve the thermal energy utilization efficiency. The scraping component 2 includes an annular scraper 21 and a dome 22. The dome 22 is located in the middle of the annular scraper 21, and a steam accumulation chamber is formed at the bottom of the dome 22. The outer cross-section of the annular scraper 21 is adapted to the cross-section of the channel 121. The annular scraper 21 is the main structure for scraping off pollutants, and the dome 22 is used to enhance the steam lifting and accumulation effect, thereby quickly pushing the scraping component 2 upward.

[0035] refer to Figures 1 to 6The scraping section 21 has several scraping speed control holes 23, which are used to allow some steam to flow out of the channel 121. When the steam rises too fast, the scraping speed control holes 23 can be used to reduce the steam pressure at the bottom of the scraping assembly 2. The top of the evaporation section 12 is fixed with a top plate 122, and the bottom of the evaporation section 12 is fixed with a bottom plate 123. The venting structure 3 includes a branch pipe 31 and a connecting end 32. The branch pipe 31 is fixed to the top of the evaporation section 12 through the connecting end 32. When the scraping assembly 2 rises to the top, the branch pipe 31 in the venting structure 3 can quickly discharge the water vapor accumulated at the bottom of the scraping assembly 2, thereby making the steam pressure less than the weight of the scraping assembly 2 and controlling the scraping assembly 2 to fall downward.

[0036] refer to Figures 1 to 6 The channel 121 has a bottom protrusion 24 fixed at its bottom and a bottom impact spring 25 fixed at its top. When the scraping component 2 falls to the bottom, it contacts the bottom impact spring 25 at the top of the bottom protrusion 24, resulting in an impact that vibrates and removes dirt from the surface of the scraping component 2. The channel 121 also has a top protrusion 26 fixed at its top and an upper impact spring 27 fixed at its bottom. When the scraping component 2 rises to the top of the channel 121, it contacts the upper impact spring 27 at the top of the top protrusion 26, resulting in an impact that vibrates and removes dirt from the surface of the scraping component 2.

[0037] refer to Figures 1 to 6 The liquid injection section 11 is connected to an industrial wastewater injection pipe 111, the liquid storage section 13 is connected to a liquid storage pipe 131, and the evaporation section 12 is connected to a steam pipe 124. The industrial wastewater injection pipe 111 is used to conveniently inject sewage, the steam pipe 124 can provide an external heat source, and the liquid storage pipe 131 can realize water recycling.

[0038] refer to Figures 1 to 6 The working principle of this invention is as follows:

[0039] When the wastewater in the injection section 11 is heated by the evaporation section 12, the water in the wastewater can be converted into water vapor. The water vapor can rise through the channel 121 to the storage section 13. After cooling, the water vapor in the storage section 13 becomes condensate, which greatly reduces its harmful components compared to wastewater. In addition, since the evaporator is wastewater, it will carry some pollutants, which will cause dirt to accumulate on the inner wall of the channel 121 over time. Because this evaporator is equipped with a scraping component 2 and a venting structure 3 in the channel 121, when the steam accumulates at the bottom of the scraping component 2 in the channel 121 and the steam pressure is greater than the weight of the scraping component 2, it will lift the scraping component 2 to the top of the channel 121 for upward scraping. When the steam speed rises too fast, the scraping speed control hole 23 is activated, and the steam pressure at the bottom of the scraping component 2 is controlled. The pressure can be reduced by controlling the pressure discharge through the scraping speed control hole 23. When the scraping component 2 rises to the top, the branch pipe 31 in the venting structure 3 can quickly discharge the water vapor accumulated at the bottom of the scraping component 2, thereby causing the steam pressure to be less than the weight of the scraping component 2, controlling the scraping component 2 to fall downward. When the scraping component 2 rises to the top of the channel 121, it will contact the upper impact spring 27 at the top of the top protrusion 26 to achieve an impact, thereby vibrating and dislodging the dirt on the surface of the scraping component 2. When the scraping component 2 falls to the bottom, it will contact the lower impact spring 25 at the top of the bottom protrusion 24 to achieve an impact, thereby vibrating and dislodging the dirt on the surface of the scraping component 2. By using the up and down movement of the scraping component 2, the dirt on the inner wall of the channel 121 can be scraped off and dropped into the sewage in the injection section 11.

[0040] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A MVR evaporator comprising an evaporation chamber (1) comprising a liquid injection section (11), an evaporation section (12) and a liquid storage section (13) within the evaporation chamber (1), the evaporation section (12) comprising a plurality of vertically arranged channels (121) for vapor flow, characterized in that: Each of the channels (121) is provided with a scraping assembly (2) which is slidingly connected to the inner wall of the channel (121), the top of the channel (121) is provided with a gas release structure (3), when the steam in the channel (121) is accumulated at the bottom of the scraping assembly (2) and the steam pressure is greater than the gravity of the scraping assembly (2), the scraping assembly (2) is lifted to the top of the channel (121) to scrape the wall upward, when the scraping assembly (2) reaches the gas release structure (3), the gas release structure (3) releases the steam accumulated at the bottom of the scraping assembly (2) and controls the scraping assembly (2) to fall to the bottom of the channel (121) to realize downward scraping of the wall; The scraping assembly (2) comprises a ring scraping part (21) and a dome part (22), the dome part (22) is located in the middle of the ring scraping part (21), the bottom of the dome part (22) forms a steam accumulation cavity, and the outer section of the ring scraping part (21) is matched with the section of the channel (121); A plurality of scraping speed control holes (23) are formed in the ring scraping part (21), and the plurality of scraping speed control holes (23) are respectively used for part of the steam in the channel (121) to flow out; The bottom of the channel (121) is fixedly provided with a bottom protruding sheet (24), and the top of the bottom protruding sheet (24) is fixedly provided with a lower impact spring (25); The top of the channel (121) is fixedly provided with a top protruding sheet (26), and the bottom of the top protruding sheet (26) is fixedly provided with an upper impact spring (27).

2. The MVR evaporator of claim 1, wherein: The channel (121) has a special section, and the section shape of the channel (121) at least includes petal shape, oval shape and polygonal shape.

3. The MVR evaporator of claim 1, wherein: The top of the evaporation section (12) is fixedly provided with a top plate (122), the bottom of the evaporation section (12) is fixedly provided with a bottom plate (123), the gas release structure (3) comprises a branch pipe (31) and a connecting end (32), and the branch pipe (31) is fixed to the top of the evaporation section (12) through the connecting end (32).

4. The MVR evaporator of claim 1, wherein: The liquid injection section (11) is connected with an industrial wastewater injection pipeline (111), the liquid storage section (13) is connected with a liquid storage pipeline (131), and the evaporation section (12) is connected with a steam pipeline (124).

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