Device for reducing use amount of cleaning fluid for MVR evaporator tube nest

Abstract

The utility model relates to the technical field of evaporators, and discloses a device for reducing the use amount of cleaning liquid in a tube nest of an MVR (mechanical vapor recompression) evaporator, which comprises a liquid level adjusting mechanism positioned in a concentrated liquid collecting chamber of the MVR evaporator and used for changing the liquid level in the concentrated liquid collecting chamber. And a valve is arranged on the discharge pipe communicated with the concentrated liquid collecting chamber. According to the scheme, the height of alkali liquor in the evaporator can be increased by cutting off the pipeline between the evaporator and the gas-liquid separator, filling the bottom space of the MVR, increasing the height of the liquid level in the bottom concentrated liquor gathering chamber and the like, and the alkali liquor is enabled to soak the tube nest, so that the purpose of softening medicine scale is achieved, and scaling of the tube nest is relieved.

Description

Technical Field

[0001] The utility model relates to the technical field of evaporators, in particular to a device for reducing the amount of cleaning liquid used in MVR evaporator tubes. Background Art

[0002] The MVR evaporator (Mechanical Vapor Recompression Evaporator) is a highly efficient evaporation equipment widely used in the chemical, pharmaceutical, and food industries. Its core feature is that it recovers and reuses steam through the compressor, thereby significantly reducing energy consumption.

[0003] The MVR evaporator consists of a shell with a feed pipe at the top and a heating chamber below it. This chamber features an orifice plate and tubes mounted on the plate. A concentrate collection chamber is located below the orifice plate at the bottom, connected to a discharge pipe and a gas-liquid separation chamber. During operation, the MVR evaporator creates a negative pressure within the tubes, facilitating evaporation and concentration of the liquid. Under this negative pressure, the gas and liquid within the tubes enter the gas-liquid separation chamber for separation. As the chemical solution evaporates and concentrates within the tubes, its density increases, making it more likely to adhere to the inner walls of the tubes, forming scale. Currently, after production is completed, alkaline solution (sodium hydroxide solution) is used to remove this scale through heated forced circulation. However, due to the negative pressure, the alkaline solution is discharged into the concentrate collection chamber and discharge pipe at the bottom, making it difficult to fully immerse the tubes in the solution. Consequently, large quantities of alkaline solution are required for flushing. Utility Model Content

[0004] The utility model aims to provide a device for reducing the amount of cleaning liquid used in the tubes of an MVR evaporator, so as to solve the problem of large amount of cleaning liquid used in the tubes at present.

[0005] To achieve the above-mentioned object, the present invention adopts the following technical solution: a device for reducing the amount of cleaning liquid used in the tubes of an MVR evaporator, comprising: a liquid level regulating mechanism, the liquid level regulating mechanism being located in the concentrate collection chamber of the MVR evaporator, the liquid level regulating mechanism being used to change the liquid level in the concentrate collection chamber, and a valve being provided on a discharge pipe connected to the concentrate collection chamber.

[0006] The principle of this solution is: when injecting alkali solution into the tubes to soak them, first close the valve on the discharge pipe to prevent the added alkali solution from being discharged to the subsequent device and causing waste. Then use the liquid level adjustment mechanism to increase the liquid level in the concentrated liquid collection chamber. In this way, the amount of alkali solution needed to fill the space can be reduced, reducing the amount of alkali solution used when soaking the tubes.

[0007] Advantages of this solution: By cutting off the pipeline between the evaporator and the gas-liquid separator, filling the bottom space of the MVR, and increasing the liquid level in the bottom concentrate collection chamber, the alkali liquid level in the evaporator can be greatly increased without increasing the amount of alkali liquid. The alkali liquid can be soaked into the tubes at a sufficiently high level, thereby achieving the purpose of softening the chemical scale and alleviating tube scaling.

[0008] Preferably, the liquid level regulating mechanism comprises an air bag or a telescopic folding member. By changing the volume of the air bag or the volume occupied by the telescopic folding member, the liquid level in the concentrated liquid collecting chamber can be quickly changed.

[0009] Preferably, the airbags or telescopic folding members are provided in plurality, so as to facilitate rapid adjustment of the liquid level of the concentrated liquid collection chamber.

[0010] Preferably, the airbags or telescopic folding members are evenly distributed in the concentrate collection chamber.

[0011] Preferably, a partition is provided at the bottom of the concentrate collection chamber, the partition being used to divide the concentrate collection chamber into a plurality of interconnected cells, each of which is provided with an airbag or a telescopic folding member. The partition confines the airbag or telescopic folding member in each cell and evenly distributes the airbag or telescopic folding member in the concentrate collection chamber.

[0012] Preferably, the device further comprises a connecting member for fixing the airbag or the telescopic folding member to the inner wall of the concentrate collecting chamber. The airbag or the telescopic folding member is fixed to the inner wall of the concentrate collecting chamber to prevent the airbag or the telescopic folding member from moving when expanding, thereby preventing the size of the telescopic expansion space from being affected.

[0013] Preferably, after the telescopic folding member is extended or retracted, a preset distance is left between the telescopic folding member and the lower end of the tube, so as to avoid the telescopic folding member from hitting the tube and causing damage to the tube.

[0014] Preferably, the valve is a butterfly valve, which is a commonly used valve for regulating and cutting off fluid flow, is easy to manufacture and maintain, is usually lighter, and is easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of an embodiment of the present utility model. DETAILED DESCRIPTION

[0016] The following is further described in detail through specific implementation methods:

[0017] The reference numerals in the drawings of the specification include: butterfly valve 1, discharge pipe 2, liquid level adjustment mechanism 3, shell 4, heating chamber 5, tube array 6, concentrate collection chamber 7.

[0018] Example:

[0019] A device for reducing the amount of cleaning liquid used in the MVR evaporator tube 6, as shown in the attached Figure 1As shown, it includes: a liquid level regulating mechanism 3, which is located in the concentrate collecting chamber 7 of the MVR evaporator. The liquid level regulating mechanism 3 is used to change the liquid level in the concentrate collecting chamber 7. The concentrate collecting chamber 7 is connected to the gas-liquid separator through the discharge pipe 2.

[0020] A valve, butterfly valve 1, is installed on discharge pipe 2. Butterfly valve 1 is a commonly used valve for regulating and shutting off fluid flow. It is easy to manufacture and maintain, and is generally lighter and easier to install. When cleaning the tubes 6 within the MVR evaporator, first close the valve on discharge pipe 2. Then, add cleaning fluid from the top of the evaporator's shell 4. The cleaning fluid flushes the tubes 6 within the heating chamber 5 and then enters the concentrated liquid collection chamber for collection. This prevents the cleaning fluid from being discharged directly from the discharge pipe after passing through the tubes 6. Instead, the cleaning fluid used to flush the tubes 6 collects in the concentrated liquid collection chamber 7 at the bottom of the evaporator, allowing the alkaline solution to soak into the tubes 6, thereby softening the drug scale. The cleaning fluid is an alkaline solution added using existing special cleaning methods, specifically a 1% to 2% sodium hydroxide solution. The specific cleaning fluid is adjusted based on the corresponding drug scale.

[0021] The liquid level adjustment mechanism 3 includes an airbag or a telescopic folding member. By changing the volume of the airbag or the occupied volume of the telescopic folding member, the liquid level in the concentrate collection chamber 7 can be quickly adjusted. Filling the concentrate collection chamber 7 at the bottom of the MVR evaporator, raising the liquid level in the bottom concentrate collection chamber, can increase the level of alkali solution in the evaporator, allowing the alkali solution to penetrate the tubes 6, thereby softening the chemical scale and alleviating scaling.

[0022] Multiple airbags or telescopic folding members are provided. This facilitates rapid adjustment of the liquid level in concentrate collection chamber 7. In this embodiment, two airbags or telescopic folding members are preferably provided. The telescopic folding member, which contracts when folded and expands when expanded to occupy the volume of concentrate collection chamber 7, can be constructed using structures such as bellows and piston cylinders. Reference is made to existing technologies and will not be described in detail.

[0023] The airbags or telescopic folding members are evenly distributed within the concentrate collection chamber 7. A partition is provided at the bottom of the concentrate collection chamber 7, dividing it into multiple interconnected cells. Each cell is equipped with an airbag or telescopic folding member. The partition confines the airbags or telescopic folding members within each cell and evenly distributes them within the concentrate collection chamber 7.

[0024] The apparatus also includes a connector for securing the airbag or telescopic folding member to the inner wall of the concentrate collection chamber 7. This secures the airbag or telescopic folding member to the inner wall of the concentrate collection chamber 7 to prevent it from shifting during expansion, potentially affecting the size of the expandable space. The connector in this embodiment can be configured based on actual needs.

[0025] After the telescopic folding member is extended and retracted, a preset distance is left between the telescopic folding member and the lower end of the tube 6 to avoid the telescopic folding member from collide with the tube 6 and damage the tube 6.

[0026] A corresponding inspection door is provided on the side wall of the concentrated liquid collection chamber 7 to facilitate adjustment and inspection of the liquid level regulating mechanism 3 .

[0027] Compared with the existing special cleaning method of adding about 2000L of 1% to 2% sodium hydroxide solution to soak the MVR, this solution of first cutting off the discharge pipe and the gas-liquid separator and then filling the bottom space greatly reduces the amount of sodium hydroxide solution used.

[0028] The above is only an embodiment of the present invention, and the common knowledge such as the specific technical solutions and / or characteristics in the solution are not described in detail here. It should be pointed out that for those skilled in the art, several variations and improvements can be made without departing from the technical solution of the present invention. In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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 directly connected, or indirectly connected through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. The scope of protection claimed in this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A device for reducing the amount of cleaning liquid used in MVR evaporator tubes, characterized in that: include: The liquid level regulating mechanism is located in the concentrated liquid collecting chamber of the MVR evaporator and is used to change the liquid level in the concentrated liquid collecting chamber. A valve is provided on the discharge pipe connected to the concentrated liquid collecting chamber.

2. The device for reducing the amount of cleaning fluid used in an MVR evaporator tube according to claim 1, characterized in that: The liquid level regulating mechanism includes an air bag or a telescopic folding member.

3. The device for reducing the amount of cleaning fluid used in an MVR evaporator tube according to claim 2, characterized in that: There are multiple airbags or telescopic folding parts.

4. The device for reducing the amount of cleaning fluid used in an MVR evaporator tube according to claim 3, characterized in that: The air bags or telescopic folding parts are evenly distributed in the concentrated liquid collection chamber.

5. The device for reducing the amount of cleaning fluid used in an MVR evaporator tube according to claim 4, characterized in that: A partition is provided at the bottom of the concentrate collection chamber, and the partition is used to divide the concentrate collection chamber into a plurality of interconnected cells, each of which is correspondingly provided with an air bag or a telescopic folding member.

6. The device for reducing the amount of cleaning fluid used in an MVR evaporator tube according to claim 2, characterized in that: The invention also includes a connecting piece for fixing the air bag or the telescopic folding piece on the inner wall of the concentrate collecting chamber.

7. The device for reducing the amount of cleaning fluid used in an MVR evaporator tube according to claim 2, characterized in that: After the telescopic folding member is extended and retracted, a preset distance is left between the telescopic folding member and the lower end of the tube array.

8. The device for reducing the amount of cleaning fluid used in an MVR evaporator tube according to claim 1, characterized in that: The valve is a butterfly valve.

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