MVR evaporator for wastewater separation

Abstract

The utility model discloses a kind of MVR evaporator for wastewater separation belongs to wastewater treatment technical field, preheating tank is connected with evaporator main body by pipeline, and the preheating tank is used for the preheating before wastewater enters evaporator main body. In this way, in the process of wastewater circulating heating evaporation, before wastewater enters evaporator main body, first enter preheating tank preheating, preheating again enters evaporator main body, solve the wastewater directly into evaporating tank, because wastewater temperature is lower, cause greater thermal shock to heating element and structure inside evaporating tank, thermal shock leads to heating element damage, heating tube bundle crack due to temperature sudden change, or make the material of evaporating tank thermal stress deformation technical problem.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, specifically relating to an MVR evaporator for wastewater separation. Background Technology

[0002] Currently, wastewater concentrate refers to the concentrated liquid produced during wastewater treatment. It typically refers to the process of evaporating or removing water from wastewater through methods such as evaporation, filtration, and concentration, thereby concentrating solid or dissolved substances in the liquid. This concentrated liquid may contain pollutants, dissolved substances, or other chemical substances from the wastewater. The composition and properties of wastewater concentrate vary depending on the source of the wastewater, the treatment process, and the characteristics of the wastewater. Therefore, specific wastewater concentrates may contain suspended solids, dissolved substances, heavy metals, organic matter, and other pollutants. When treating and disposing of wastewater concentrates, appropriate treatment methods should be adopted based on their characteristics to achieve the goals of environmental protection and resource utilization.

[0003] The applicant discovered through a search that Chinese utility model patent with publication number CN221275299U discloses an MVR evaporator for solid-liquid separation of wastewater concentrate. It mainly includes an evaporator tank and a steam compressor. A first connecting pipe and a second connecting pipe are provided between the evaporator tank and the steam compressor. The technical solution involves continuously evaporating wastewater, and then recovering the solid particles in the wastewater through a solid recovery box, thus improving the wastewater treatment effect and recovery efficiency. However, in this technology, the wastewater directly enters the evaporator tank. Due to the low temperature of the wastewater, this can cause significant thermal shock to the heating elements and structure inside the evaporator tank. This thermal shock may damage the heating elements, cause cracks in the heating tube bundle due to sudden temperature changes, or cause thermal stress deformation of the evaporator tank material. Utility Model Content

[0004] In view of this, the present invention provides an MVR evaporator for wastewater separation, which solves the technical problem in the prior art that, because the wastewater enters the evaporator directly, the low temperature of the wastewater causes a large thermal shock to the heating elements and structure inside the evaporator. This thermal shock may damage the heating elements, cause cracks in the heating tube bundle due to sudden temperature changes, or cause thermal stress deformation of the evaporator material.

[0005] The MVR evaporator used for wastewater separation adopts the following technical solution:

[0006] An MVR evaporator for wastewater separation includes an evaporator body and a steam tank for supplying steam to the evaporator body, wherein wastewater is evaporated and concentrated in the evaporator body, characterized in that it further includes a preheating tank;

[0007] The preheating tank is connected to the evaporator body via a pipeline, and the preheating tank is used to preheat the wastewater before it enters the evaporator body.

[0008] Furthermore, the preheating tank is provided with a preheating chamber and a concentrated liquid storage chamber;

[0009] The concentrated liquid storage chamber is connected to the evaporator body through a pipeline, and the wastewater flows into the concentrated liquid storage chamber after being evaporated and concentrated in the evaporator body;

[0010] A heat-conducting component is provided between the preheating chamber and the concentrated liquid storage chamber to transfer the heat of the concentrated liquid in the concentrated liquid storage chamber to the preheating chamber, thereby preheating the wastewater before it enters the evaporator body.

[0011] Furthermore, the heat-conducting element is a heat-conducting sheet.

[0012] Furthermore, the heat-conducting plate is disposed on the inner wall of the preheating tank, and the heat-conducting plate is spiral-shaped.

[0013] Furthermore, the preheating tank is divided into a preheating chamber and a concentrated liquid storage chamber by a partition; the partition is a metal component.

[0014] Furthermore, the preheating chamber is located above the concentrate storage chamber.

[0015] Furthermore, the evaporator body is equipped with an electric cleaning device for cleaning the interior of the evaporator body.

[0016] Beneficial effects:

[0017] 1. The preheating tank is connected to the evaporator body via a pipeline, and the preheating tank is used to preheat the wastewater before it enters the evaporator body. Thus, during the wastewater circulation heating and evaporation process, the wastewater first enters the preheating tank for preheating before entering the evaporator body. This solves the technical problem that when wastewater directly enters the evaporator, its low temperature causes significant thermal shock to the heating elements and structure inside the evaporator, leading to damage to the heating elements, cracks in the heating tube bundle due to sudden temperature changes, or thermal stress deformation of the evaporator material.

[0018] 2. The preheating tank is equipped with a preheating chamber and a concentrated liquid storage chamber. The concentrated liquid storage chamber is connected to the evaporator body via a pipeline. After the wastewater is evaporated and concentrated in the evaporator body, it flows into the concentrated liquid storage chamber. A heat-conducting component is installed between the preheating chamber and the concentrated liquid storage chamber to transfer the heat of the concentrated liquid in the concentrated liquid storage chamber to the preheating chamber, thus preheating the wastewater before it enters the evaporator body. In this way, the preheating tank can directly utilize the heat of the concentrated liquid discharged from the evaporator body to preheat the wastewater, improving energy utilization efficiency.

[0019] 3. The preheating tank is divided into a preheating chamber and a concentrate storage chamber by a partition; the partition is made of metal. This results in a simple and compact preheating tank structure. Furthermore, the metal partition not only separates the preheating chamber from the concentrate storage chamber but also transfers heat from the concentrate in the concentrate storage chamber to the preheating chamber to preheat the wastewater. This dual heat transfer mechanism of the partition and the heat-conducting component improves the wastewater preheating effect and energy utilization.

[0020] 4. The evaporator body is equipped with an electric cleaning device for cleaning the inside of the evaporator body. In this way, the evaporator body can be automatically cleaned after the wastewater separation operation is completed.

[0021] 5. Pour an appropriate amount of water into the evaporator body. At the same time, start the rotating motor. The motor drives the rotating shaft to rotate, which in turn drives the fixed rod and cleaning plate connected to it to rotate synchronously. The cleaning brush on the cleaning plate makes close contact with the inner wall of the evaporator body. As the cleaning plate rotates, the cleaning brush can effectively scrape off the dirt attached to the inner wall of the evaporator body. The scraped dirt is gradually settled to the bottom of the evaporator body by the water flow and is finally discharged with the wastewater. Through this cleaning method, it can be ensured that the inner wall of the evaporator body is always kept clean, effectively avoiding the problem of impurities forming scale on the inner surface of the evaporator body, thus ensuring that the heating performance of the evaporator body is not affected and maintaining the efficient and stable operation of the evaporator in subsequent use.

[0022] 6. The preheating chamber is located above the concentrate storage chamber, improving thermal conductivity and reducing pumping energy consumption by utilizing gravity flow. Additionally, the spiral-shaped heat-conducting fins further enhance thermal conductivity. Attached Figure Description

[0023] Figure 1 A three-dimensional structural diagram of an MVR evaporator for wastewater separation provided by this utility model;

[0024] Figure 2 A three-dimensional back view of an MVR evaporator for wastewater separation provided by this utility model;

[0025] Figure 3 A front cross-sectional view of an MVR evaporator for wastewater separation provided by this utility model;

[0026] Figure 4 A schematic diagram of a cleaning device for an MVR evaporator used for wastewater separation provided by this utility model;

[0027] The components are as follows: 1- Mounting plate; 2- Evaporator body; 3- Preheating tank; 4- Cleaning device; 5- Steam compression tank; 6- Support base; 7- Wastewater pump; 8- Drain pipe; 9- Connecting pipe; 10- Steam pump; 11- Sewage pipe; 12- Check valve; 301- Preheating chamber; 302- Concentrate storage chamber; 303- Sewage outlet; 304- Partition plate; 305- Inner cavity; 306- Heat-conducting component; 307- Water inlet pipe; 401- Rotating motor; 402- Rotating shaft; 403- Fixing rod; 404- Cleaning plate; 405- Cleaning brush. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] Example 1:

[0030] Reference Figures 1-4 An MVR evaporator for wastewater separation includes an evaporator body 2 and a steam tank for supplying steam to the evaporator body 2, wherein wastewater is evaporated and concentrated in the evaporator body 2. In particular, it also includes a preheating tank 3, which is connected to the evaporator body 2 via a pipeline and is used to preheat the wastewater before it enters the evaporator body 2.

[0031] As a further improvement, the inner cavity 305 of the preheating tank 3 is provided with a preheating cavity 301 and a concentrate storage cavity 302; the concentrate storage cavity 302 is connected to the evaporator body 2 through a pipeline, and the wastewater flows into the concentrate storage cavity 302 after being evaporated and concentrated in the evaporator body 2; a heat-conducting component 306 is provided between the preheating cavity 301 and the concentrate storage cavity 302 to transfer the heat of the concentrate in the concentrate storage cavity 302 to the preheating cavity 301, thereby achieving preheating of the wastewater before it enters the evaporator body 2.

[0032] For example, the heat-conducting element 306 is a heat-conducting plate. The heat-conducting plate can be disposed on the inner wall of the preheating tank 3, and the heat-conducting plate can be selected to be spiral-shaped.

[0033] As a further improvement, a preheating chamber 301 and a concentrate storage chamber 302 are formed inside the preheating tank 3 by a partition 304; the partition 304 is a metal part.

[0034] For example, the preheating chamber 301 is located above the concentrate storage chamber 302.

[0035] For example, the evaporator body 2 is provided with an electric cleaning device for cleaning the inside of the evaporator body 2.

[0036] Specifically, in this embodiment, a drain outlet 303 is provided on one side of the concentrated liquid storage chamber 302, a water inlet pipe 307 is fixedly installed at the upper end of the preheating chamber 301, a wastewater pump 7 is installed between the preheating chamber 301 and the evaporator body 2, the wastewater pump 7 is connected to the preheating chamber 301 and the evaporator body 2 through a drain pipe 8, a drain pipe 11 is installed at the bottom of the evaporator body 2, the other end of the drain pipe 11 is connected to the concentrated liquid storage chamber 302, and a one-way valve 12 is provided on the drain pipe 11 so that the waste liquid after evaporation and concentration in the evaporator body 2 can only flow to the concentrated liquid storage chamber 302 in one direction.

[0037] Specifically, in this embodiment, the steam tank includes a steam compression tank 5. The high-temperature and high-pressure steam compressed by the steam compression tank 5 is sent to the heating chamber in the evaporator body 2 and used as heating steam to provide heat for the evaporation of wastewater in the evaporator body 2. The material of the baffle 304 is generally selected as a metal material with good thermal conductivity, such as stainless steel, so that the heat of the concentrate storage chamber 302 can be transferred to the preheating chamber 301 by the baffle 304.

[0038] Specifically, in this embodiment, before the wastewater enters the evaporator body 2, it is first fed into the preheating chamber 301 through the inlet pipe 307. The high-temperature concentrate discharged from the evaporator body 2 enters the concentrate storage chamber 302 through the drain pipe 11. The baffle 304 has good thermal conductivity and can effectively transfer heat to the preheating chamber 301. When the concentrate flows in the concentrate storage chamber 302, the heat-conducting component 306 will transfer the heat of the concentrate to the preheating chamber 301. After the wastewater enters the preheating chamber 301, it can absorb this residual heat, thereby increasing its own temperature.

[0039] Specifically, a steam pump 10 is also provided, which is connected between the steam compression tank 5 and the evaporator body 2 via a connecting pipe 9. The connecting pipe 9 is located on the upper part of the evaporator body 2. Moreover, three sets of support seats 6 arranged in a circular array are fixedly installed at the bottom of the evaporator body 2. The support seats 6 are fixedly installed on the mounting plate 1 (refer to the attached drawings; in this embodiment, the preheating tank 3, the steam compression tank 5, the wastewater pump 7, and the steam pump 10 are all installed on the mounting plate 1).

[0040] Reference Figure 3The evaporator body 2 is equipped with a cleaning device 4, which includes a rotating motor 401. A rotating shaft 402 is fixedly installed at the output end of the rotating motor 401, and the rotating shaft 402 is located inside the evaporator body 2. Multiple fixing rods 403 are fixedly installed on the circumferential surface of the rotating shaft 402. A cleaning plate 404 is fixedly installed at the end of the fixing rod 403 away from the rotating shaft 402. A cleaning brush 405 is fixedly installed on the side surface of the cleaning plate 404 away from the fixing rod 403. The rotating shaft 402 extends into the evaporator body 2, and a sealing ring is provided at the connection between the rotating shaft 402 and the evaporator body 2. The rotating motor 401 is fixedly installed at the center of the bottom outer surface of the evaporator body 2, and the cleaning brush 405 is in contact with the inner wall of the evaporator body 2. The cleaning device 4 can clean the inside of the evaporator body 2 periodically or irregularly. The cleaning brush 405 can spray cleaning liquid evenly to dissolve and remove dirt on the heating surface and internal space of the evaporator body 2. If it is not cleaned regularly, the heat transfer efficiency may be greatly reduced as the scale layer thickens, and the evaporation process may even be difficult to carry out effectively.

[0041] Specifically, after the wastewater separation is completed, impurities in the wastewater may form scale on the inner surface of the evaporator body 2. During cleaning, water is injected into the evaporator body 2. At the same time, the rotating motor 401 is started, which causes the rotating shaft 402 to drive the fixed rod 403 and the cleaning plate 404 to rotate. The cleaning brush 405 cleans the dirt on the inner wall of the evaporator body 2 and scrapes it off to the bottom of the evaporator body 2 for discharge. This ensures that the inner wall of the evaporator body 2 is clean and prevents these impurities from forming scale on the inner surface of the evaporator body 2, thus avoiding affecting the heating performance of the evaporator body 2.

[0042] The working principle of this MVR evaporator for wastewater separation is as follows: Before the wastewater enters the evaporator body 2, it is first fed into the preheating tank 301 through the inlet pipe 307. The high-temperature concentrate discharged from the evaporator body 2 enters the concentrate storage chamber 302 through the drain pipe 11. The baffle 304 has good thermal conductivity and can effectively transfer heat to the preheating chamber 301. Moreover, the heat-conducting element 306 also transfers the heat of the concentrate to the inner wall of the preheating tank 301, especially when the concentrate flows in the concentrate storage chamber 302 (the concentrate can be discharged from the drain port 303). In the storage chamber 302, wastewater enters the preheating chamber 301 and absorbs residual heat, thus raising its own temperature. Then, the preheated wastewater is pumped into the evaporator body 2 via the wastewater pump 7 and drain pipe 8. Through heating, the wastewater continuously evaporates and concentrates within the evaporator body 2. When a certain concentration is reached, steam enters the steam compression tank 5. The one-way valve 12 is opened, and the concentrated liquid enters the concentrated liquid storage chamber 302 through the drain pipe 11. The steam is compressed in the steam compression tank 5, and the compressed secondary steam enters the heating chamber of the evaporator body 2 via the steam pump 10 and connecting pipe 9, thus circulating. After the operation is complete, impurities in the wastewater may form scale on the inner surface of the evaporator body 2. Subsequently, water is injected into the evaporator body 2. Simultaneously, the rotating motor 401 is started, and the rotating shaft 402 drives the fixed rod 403 and cleaning plate 404 to rotate. The cleaning brush 405 cleans the dirt on the inner wall of the evaporator body 2, scraping it off to the bottom of the evaporator body 2 for discharge, ensuring the cleanliness of the inner wall of the evaporator body 2.

[0043] Example 2:

[0044] This embodiment provides a wastewater separation method in which wastewater is first preheated in a preheating tank 3 before entering the evaporator body 2 for evaporation and concentration.

[0045] As a further improvement, the preheating tank 3 is provided with a preheating chamber 301 and a concentrate storage chamber 302;

[0046] After the wastewater is evaporated and concentrated in the evaporator body 2, it flows into the concentrate storage chamber 302 and the heat of the concentrate in the concentrate storage chamber 302 is transferred to the preheating chamber 301 through the heat conduction element 306.

[0047] As a further improvement, the preheating tank 3 is separated by a partition 304 to form a preheating chamber 301 and a concentrated liquid storage chamber 302. After the wastewater is evaporated and concentrated in the evaporator body 2, it flows into the concentrated liquid storage chamber 302 and the heat of the concentrated liquid in the concentrated liquid storage chamber 302 is transferred to the preheating chamber 301 through the heat-conducting element 306 and the partition 304 to preheat the wastewater.

[0048] In summary, the above are merely preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. An MVR evaporator for wastewater separation, comprising an evaporator body and a steam tank for supplying steam to the evaporator body, wherein wastewater is evaporated and concentrated in the evaporator body, characterized in that, It also includes a preheating tank; The preheating tank is connected to the evaporator body via a pipeline, and the preheating tank is used to preheat the wastewater before it enters the evaporator body.

2. The MVR evaporator for wastewater separation according to claim 1, characterized in that, The preheating tank is equipped with a preheating chamber and a concentrated liquid storage chamber; The concentrated liquid storage chamber is connected to the evaporator body through a pipeline, and the wastewater flows into the concentrated liquid storage chamber after being evaporated and concentrated in the evaporator body; A heat-conducting component is provided between the preheating chamber and the concentrated liquid storage chamber to transfer the heat of the concentrated liquid in the concentrated liquid storage chamber to the preheating chamber, thereby preheating the wastewater before it enters the evaporator body.

3. The MVR evaporator for wastewater separation according to claim 2, characterized in that, The heat-conducting component is a heat-conducting sheet.

4. An MVR evaporator for wastewater separation according to claim 3, characterized in that, The heat-conducting plate is disposed on the inner wall of the preheating tank, and the heat-conducting plate is spiral-shaped.

5. An MVR evaporator for wastewater separation according to any one of claims 2 to 4, characterized in that, The preheating tank is divided into a preheating chamber and a concentrated liquid storage chamber by a partition; the partition is a metal component.

6. An MVR evaporator for wastewater separation according to any one of claims 2 to 4, characterized in that, The preheating chamber is located above the concentrate storage chamber.

7. An MVR evaporator for wastewater separation according to any one of claims 2 to 4, characterized in that, The evaporator body is equipped with an electric cleaning device for cleaning the inside of the evaporator body.

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