MVR evaporator for wastewater separation

Abstract

The invention discloses an MVR (mechanical vapor recompression) evaporator for wastewater separation, and belongs to the technical field of wastewater treatment, a preheating tank is connected with an evaporator main body through a pipeline, and the preheating tank is used for preheating wastewater before the wastewater enters the evaporator main body. Therefore, in the process of circularly heating and evaporating the wastewater, the wastewater firstly enters the preheating tank to be preheated before entering the evaporator main body, and then enters the evaporator main body after being preheated, so that the problem that the wastewater directly enters the evaporation tank, and the temperature of the wastewater is relatively low, so that relatively large thermal shock is caused to heating elements and structures in the evaporation tank is solved; the technical problems that a heating element is damaged due to thermal shock, a heating tube bundle cracks due to temperature shock, or materials of the evaporation tank are subjected to thermal stress deformation are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to an MVR evaporator for wastewater separation. Background Art

[0002] At present, wastewater concentrate refers to the concentrated liquid produced in the wastewater treatment process. It usually refers to the process in which the water in the wastewater is evaporated or removed through evaporation, filtration, concentration and other methods, so that the solid matter or dissolved matter in the wastewater is concentrated in the liquid. This concentrated liquid may contain pollutants, dissolved substances or other chemical substances in the wastewater. The composition and properties of the wastewater concentrate will vary depending on the source of the wastewater, the treatment process and the characteristics of the wastewater. Therefore, the specific wastewater concentrate may contain pollutants such as suspended solids, dissolved substances, heavy metals, organic matter, etc. When treating and disposing of wastewater concentrate, appropriate treatment methods should be used according to its characteristics to achieve the purpose of environmental protection and resource utilization.

[0003] Chinese invention patent publication number CN221275299U discloses an MVR evaporator for solid-liquid separation of wastewater concentrate. The evaporator primarily comprises an evaporator tank and a steam compressor, with a first connecting pipe and a second connecting pipe disposed between the evaporator tank and the steam compressor. The technical solution is to continuously evaporate the wastewater, and then recover solid particles in the wastewater through a solid recovery tank, thereby improving wastewater treatment and recovery efficiency. However, in this technology, the wastewater enters the evaporator tank directly. Due to the relatively low temperature of the wastewater, this technology can cause significant thermal shock to the heating elements and structures within the evaporator tank. This thermal shock can damage the heating elements, crack the heating tube bundle due to the sudden temperature change, or cause thermal stress deformation in the evaporator tank material. Summary of the Invention

[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 wastewater enters the evaporator directly and the wastewater temperature is relatively low, it causes a significant thermal shock to the heating elements and structures inside the evaporator. This thermal shock may cause damage to the heating elements, cracks in the heating tube bundle due to the sudden temperature change, or cause thermal stress deformation in the evaporator material.

[0005] The present invention provides an MVR evaporator for wastewater separation that adopts the following technical solutions:

[0006] The device comprises an evaporator body and a steam tank for providing steam to the evaporator body, wherein wastewater is evaporated and concentrated in the evaporator body, and is characterized in that it further comprises a preheating tank;

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

[0008] Further, the preheating tank is provided with a preheating cavity and a concentrated liquid storage cavity.

[0009] The concentrated liquid storage cavity and the evaporator body are connected through a pipeline, and the waste water flows into the concentrated liquid storage cavity after being evaporated and concentrated in the evaporator body.

[0010] The preheating cavity and the concentrated liquid storage cavity are provided with a heat conducting member for transferring the heat of the concentrated liquid in the concentrated liquid storage cavity to the preheating cavity, so as to preheat the waste water before entering the evaporator body.

[0011] Further, the heat conducting member is a heat conducting sheet.

[0012] Further, the heat conducting sheet is arranged on the inner wall of the preheating tank, and the heat conducting sheet is spiral-shaped.

[0013] Further, the preheating tank is divided into the preheating cavity and the concentrated liquid storage cavity by a partition plate; and the partition plate is a metal member.

[0014] Further, the preheating cavity is located above the concentrated liquid storage cavity.

[0015] Further, the evaporator body is provided with an electric cleaning device for cleaning the inside of the evaporator body.

[0016] The present application provides a waste water separation method, which makes the waste water preheat in the preheating tank and then evaporate and concentrate in the evaporator body.

[0017] Further, the preheating tank is provided with a preheating cavity and a concentrated liquid storage cavity.

[0018] The waste water flows into the concentrated liquid storage cavity after being evaporated and concentrated in the evaporator body, and the heat of the concentrated liquid in the concentrated liquid storage cavity is transferred to the preheating cavity through the heat conducting member.

[0019] Further, the preheating tank is divided into the preheating cavity and the concentrated liquid storage cavity by a partition plate, and the waste water flows into the concentrated liquid storage cavity after being evaporated and concentrated in the evaporator body, and the heat of the concentrated liquid in the concentrated liquid storage cavity is transferred to the preheating cavity through the heat conducting member and the partition plate for preheating the waste water.

[0020] Advantages:

[0021] 1. The preheating tank is connected to the evaporator body via piping and is used to preheat wastewater before it enters the evaporator body. This prevents the problem of wastewater entering the evaporator directly, which, due to its lower temperature, can cause significant thermal shock to the heating elements and structures within the evaporator. This thermal shock can damage the heating elements, crack the heating tube bundle due to sudden temperature changes, or cause thermal stress deformation in the evaporator material.

[0022] 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 conductor 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, preheating the wastewater before it enters the evaporator body. In this way, the preheating tank can directly use the heat of the concentrated liquid discharged from the evaporator body to preheat the wastewater, improving energy utilization.

[0023] 3. The preheating tank is separated into a preheating chamber and a concentrate storage chamber by a metal partition. This creates 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 storage chamber to the preheating chamber to preheat the wastewater. This dual heat transfer between the partition and the heat conductor improves wastewater preheating efficiency and energy efficiency.

[0024] 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.

[0025] 5. Inject an appropriate amount of water into the evaporator body. At the same time, start the rotating motor. The motor drives the rotating shaft to start rotating, and the rotating shaft then drives the fixed rod and cleaning plate connected to it to rotate synchronously. The cleaning brush on the cleaning plate is in 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. Driven by the water flow, the scraped dirt gradually settles to the bottom of the evaporator body and is finally discharged together with the waste water. Through this cleaning method, it can ensure that the inner wall of the evaporator body is always kept clean, effectively avoiding the problem of impurities scaling on the internal surface of the evaporator body, thereby ensuring that the heating performance of the evaporator body is not affected and maintaining the efficient and stable operation of the evaporator during subsequent use.

[0026] 6. The preheating chamber is located above the concentrate storage chamber, which improves heat transfer efficiency and can use gravity flow to reduce pumping energy consumption. In addition, the heat conducting plate is spiral-shaped to improve heat transfer efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the three-dimensional structure of an MVR evaporator for wastewater separation provided by the present invention;

[0028] Figure 2 A schematic diagram of the back three-dimensional structure of an MVR evaporator for wastewater separation provided by the present invention;

[0029] Figure 3 A schematic diagram of the front cross-sectional structure of an MVR evaporator for wastewater separation provided by the present invention;

[0030] Figure 4 A schematic structural diagram of a cleaning device for an MVR evaporator for wastewater separation provided by the present invention;

[0031] Among them,: 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-drain pipe; 12-check valve; 301-preheating chamber; 302-concentrate storage chamber; 303-drain port; 304-partition; 305-inner chamber; 306-heat conducting element; 307-water inlet pipe; 401-rotating motor; 402-rotating shaft; 403-fixing rod; 404-cleaning plate; 405-cleaning brush. DETAILED DESCRIPTION

[0032] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0033] Example 1:

[0034] Reference Figure 1-Figure 4 An MVR evaporator for wastewater separation includes an evaporator body 2 and a steam tank that provides steam to the evaporator body 2. The 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 through a pipeline, and the preheating tank 3 is used to preheat the wastewater before it enters the evaporator body 2.

[0035] As a further improvement, a preheating chamber 301 and a concentrated liquid storage chamber 302 are provided in the inner cavity 305 of the preheating tank 3; the concentrated liquid storage chamber 302 is connected to the evaporator main body 2 through a pipeline, and the wastewater flows into the concentrated liquid storage chamber 302 after evaporation and concentration in the evaporator main body 2; a heat conductor 306 is provided between the preheating chamber 301 and the concentrated liquid storage chamber 302, which is used to transfer the heat of the concentrated liquid in the concentrated liquid storage chamber 302 to the preheating chamber 301, thereby realizing preheating of the wastewater before entering the evaporator main body 2.

[0036] Exemplarily, the heat-conducting member 306 is a heat-conducting sheet. The heat-conducting sheet can be arranged on the inner wall of the preheating tank 3, and the heat-conducting sheet can be selected to be spiral-shaped.

[0037] As a further improvement, the preheating tank 3 is divided into the preheating cavity 301 and the concentrated liquid storage cavity 302 by arranging the partition plate 304; the partition plate 304 is a metal member.

[0038] Exemplarily, the preheating cavity 301 is located above the concentrated liquid storage cavity 302.

[0039] Exemplarily, the evaporator body 2 is provided with an electric cleaning device for cleaning the inside of the evaporator body 2.

[0040] Specifically, in the embodiment, the concentrated liquid storage cavity 302 is provided with a blowdown port 303 on one side, the preheating cavity 301 is fixedly installed with a water inlet pipe 307 at the upper end, the preheating cavity 301 and the evaporator body 2 are installed with a waste water pump 7, the waste water pump 7 is connected with the preheating cavity 301 and the evaporator body 2 through a drain pipe 8, the bottom of the evaporator body 2 is installed with a blowdown pipe 11, the other end of the blowdown pipe 11 is connected with the concentrated liquid storage cavity 302, and the blowdown pipe 11 is provided with a one-way valve 12, so that the evaporated concentrated waste liquid in the evaporator body 2 can only flow to the concentrated liquid storage cavity 302 in one direction.

[0041] Specifically, in the 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 a heating chamber in the evaporator body 2, and is used as heating steam to provide heat for evaporation of the waste water in the evaporator body 2. The material of the partition plate 304 is generally selected to be a metal material with good heat conductivity, such as stainless steel, so that the heat of the concentrated liquid storage cavity 302 can be transmitted to the preheating cavity 301 through the partition plate 304.

[0042] Specifically, in the embodiment, before the waste water enters the evaporator body 2, the waste water is first input into the preheating cavity 301 through the water inlet pipe 307, the high-temperature concentrated liquid discharged from the inside of the evaporator body 2 enters the concentrated liquid storage cavity 302 through the blowdown pipe 11, the partition plate 304 has good heat conductivity, and can effectively transmit heat to the preheating cavity 301. When the concentrated liquid flows in the concentrated liquid storage cavity 302, the heat-conducting member 306 transmits the heat of the concentrated liquid to the preheating cavity 301, and the waste water entering the preheating cavity 301 can absorb the residual heat, thereby improving the temperature of the waste water.

[0043] Specifically, a steam pump 10 is also provided, connected between the steam compression tank 5 and the evaporator body 2 via a connecting pipe 9, which is disposed on the upper portion of the evaporator body 2. Furthermore, three sets of support blocks 6 arranged in a circumferential array are fixedly mounted on the bottom of the evaporator body 2. The support blocks 6 are fixedly mounted on the mounting plate 1 (referring to the accompanying drawings, in this embodiment, the preheating tank 3, steam compression tank 5, wastewater pump 7, and steam pump 10 are all disposed on the mounting plate 1).

[0044] Reference Figure 3 A cleaning device 4 is provided inside the evaporator body 2, and the cleaning device 4 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 arranged inside the evaporator body 2. A plurality of fixed rods 403 are fixedly installed on the circumferential surface of the rotating shaft 402, and a cleaning plate 404 is fixedly installed on one end of the fixed 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 fixed rod 403. The rotating shaft 402 extends into the interior of 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 axis 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 regularly or irregularly. The cleaning liquid can be evenly sprayed on the cleaning brush 405 to dissolve and remove dirt on the heating surface and internal space of the evaporator body 2. If it is not cleaned regularly, as the scale layer thickens, the heat transfer efficiency may be greatly reduced, and it may even make the evaporation process difficult to proceed effectively.

[0045] Specifically, after the wastewater separation work is completed, the impurities in the wastewater may form scale on the internal surface of the evaporator main body 2. When cleaning, water is injected into the evaporator main body 2. At the same time, the rotating motor 401 is started, and the driving shaft 402 is turned 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 main body 2 and scrapes it to the bottom of the evaporator main body 2 and discharges it together, ensuring that the inner wall of the evaporator main body 2 is clean, avoiding these impurities from scaling on the internal surface of the evaporator main body 2, and avoiding affecting the heating performance of the evaporator main body 2.

[0046] The working principle of the MVR evaporator for wastewater separation is as follows: before the wastewater enters the evaporator body 2, it is first input into the preheating tank 301 through the water inlet pipe 307, and the high-temperature concentrated liquid discharged from the inside of the evaporator body 2 enters the concentrated liquid storage chamber 302 through the sewage pipe 11. The partition 304 has good thermal conductivity and can effectively transfer heat to the preheating chamber 301. The heat conducting member 306 also transfers the heat of the concentrated liquid to the inner wall of the preheating tank 301. In particular, when the concentrated liquid flows in the concentrated liquid storage chamber 302 (the concentrated liquid can be discharged from the concentrated liquid storage chamber through the sewage outlet 303), the concentrated liquid will be discharged from the concentrated liquid storage chamber 302. Storage chamber 302), after the wastewater enters the preheating chamber 301, it can absorb this waste heat, thereby raising its own temperature. Subsequently, the preheated wastewater is pumped into the evaporator body 2 through the wastewater pump 7 and the drain pipe 8. Through heating, the wastewater is continuously evaporated and concentrated in the evaporator body 2. When a certain concentration is reached, the 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 through the steam pump 10 and the connecting pipe 9, and the cycle continues. After the work is completed, the impurities in the wastewater may form scale on the internal surface of the evaporator body 2. Thereafter, water is injected into the evaporator body 2. At the same time, the rotating motor 401 is started, and the rotating shaft 402 drives 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, scrapes it to the bottom of the evaporator body 2 and discharges it together, ensuring that the inner wall of the evaporator body 2 is clean.

[0047] Example 2:

[0048] This embodiment provides a wastewater separation method, in which the wastewater is preheated in a preheating tank 3 before entering the evaporator body 2 for evaporation and concentration.

[0049] As a further improvement, the preheating tank 3 is provided with a preheating chamber 301 and a concentrated liquid storage chamber 302;

[0050] After being evaporated and concentrated in the evaporator body 2 , the wastewater 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 member 306 .

[0051] 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, and the wastewater evaporates and concentrates in the evaporator body 2 and 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 conductor 306 and the partition 304 to permanently preheat the wastewater.

[0052] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An MVR evaporator for wastewater separation, comprising an evaporator body and a steam tank for providing steam to the evaporator body, wherein wastewater is evaporated and concentrated in the evaporator body, characterized in that: Also includes preheating tank; The preheating tank is connected to the evaporator body through a pipeline, and the preheating tank is used for preheating 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 provided 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 member is provided between the preheating chamber and the concentrated liquid storage chamber for transferring the heat of the concentrated liquid in the concentrated liquid storage chamber to the preheating chamber, thereby achieving preheating of 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 member is a heat conducting sheet.

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

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

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

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

8. A wastewater separation method, characterized in that: The wastewater is first preheated in the preheating tank and then enters the evaporator body for evaporation and concentration.

9. A wastewater separation method according to claim 8, characterized in that: The preheating tank is provided with a preheating chamber and a concentrated liquid storage chamber; The wastewater evaporates and concentrates in the evaporator body and flows into the concentrated liquid storage chamber, and the heat of the concentrated liquid in the concentrated liquid storage chamber is transferred to the preheating chamber through the heat conducting member.

10. A wastewater separation method according to claim 8 or 9, characterized in that: The preheating tank is divided into a preheating chamber and a concentrated liquid storage chamber by a partition, and the wastewater flows into the concentrated liquid storage chamber after evaporation and concentration in the evaporator body, and the heat of the concentrated liquid in the concentrated liquid storage chamber is transferred to the preheating chamber through the heat conductor and the partition for wastewater preheating.

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