Self-cleaning forced circulation evaporation device suitable for high-salt sewage and wastewater

Abstract

The utility model provides a self-cleaning forced circulation evaporation device suitable for high-salt waste water, which relates to the technical field of evaporator descaling devices, and comprises a heating tube nest and a tube nest cleaning device, the tube nest cleaning device comprises a scraper, and the scraper can move back and forth along the heating tube nest; the scraper scrapes dirt through the outer wall of the heating tube nest; a liquid spraying system is arranged above the heating tube nests and is used for flushing dirt scraped from the heating tube nests; end spray-washing devices are arranged at the two ends of the heating tube nest, and dirt accumulated at the two ends of the heating tube nest is washed off through the end spray-washing devices. The utility model has the beneficial effects that the movable scrapers are arranged on the side surfaces of the heating tube nests, the liquid spraying system is arranged above the heating tube nests, dirt scraped by the scrapers can be washed away, and the end spraying devices are arranged at the two ends of the heating tube nests, so that dirt pushed to the two ends of the heating tube nests in the moving process of the scrapers can be washed away; therefore, the heating tube nest is comprehensively cleaned.

Description

TECHNICAL FIELD

[0001] The utility model relates to evaporator scale removal device technical field especially a kind of self-cleaning forced circulation evaporation device suitable for high salt sewage. BACKGROUND

[0002] In recent years, in the field of high-salinity sewage treatment, evaporation technology has gradually been applied. However, during the evaporation of sewage, because the sewage contains calcium ions, magnesium ions, carbonate ions, sulfate ions and silicates, etc., these elements are continuously concentrated during the evaporation process to reach co-saturation to generate calcium carbonate, calcium sulfate and other crystal nuclei and silicate colloids, which adhere to the outer surface of the heat exchange elements of the evaporator to form a scale layer, which may, on the one hand, reduce the heat transfer coefficient and the evaporation capacity, and, on the other hand, cause the scale to "bridge" between the heat exchange elements to form a whole, affecting production and even causing shutdown. In order to ensure the continuous and stable operation of the equipment, the scale on the surface of the heat exchange elements needs to be removed. The traditional method for removing scale from the evaporator is to stop the operation and perform chemical cleaning. However, each cleaning process requires the equipment to be stopped, and frequent periodic shutdown for cleaning not only reduces the production capacity and increases the cost of cleaning chemicals, but also is time-consuming and labor-intensive. Moreover, the chemical cleaning agents may cause corrosion of the equipment.

[0003] Chinese patent document (publication number: CN106524825B, patent name: A scale removal method and system for a membrane evaporator) discloses a technology that stops the supply of steam at the steam inlet, opens the concentrated liquid discharge port to empty all materials, and adds a prepared scale removal liquid from the raw liquid inlet while running the second circulating pump and the first circulating pump. In the scale removal mode, the flow rate of the first circulating pump should be as large as possible. The scale removal liquid is pumped by the first circulating pump to the spray pipe and is sprayed from the spray port to impact the surface of each heat exchange tube to remove the scale on the surface of the heat exchange tube.

[0004] As can be seen from the above embodiments, the scale removal method and system for the evaporator use a chemical method to remove scale, which requires the equipment to be stopped each time the scale is removed. Moreover, the scale removal liquid may corrode the heating tube, affecting the application of subsequent equipment. Therefore, the method is not only time-consuming and labor-intensive, but also increases the cost of using and maintaining the equipment. Utility model content

[0005] The utility model overcomes the shortcomings of the prior art, and a movable scraper is arranged on the side of the heating tube. The scraper can scrape off the scale adhering to the outer wall of the heating tube. Moreover, the cleaning of the outer wall of the heating tube by the scraper does not need to be stopped during the operation of the heating tube, so the working time of the evaporator is not occupied. This physical cleaning method does not cause corrosion of the outer wall of the heating tube compared with the chemical cleaning method, and the scale can be cleaned in a timely manner. Therefore, the evaporator can be better maintained, and the service life of the evaporator is prolonged.

[0006] In order to solve the above technical problems, the utility model is realized through the following technical solutions:

[0007] A high-salinity wastewater self-cleaning forced circulation evaporation device, comprising an evaporator body, the evaporator body comprising a heating column pipe and a column pipe cleaning device, the column pipe cleaning device comprising a scraper, the heating column pipe being a square tube, the blade of the scraper being attached to the plane of the heating column pipe, and the scraper being movable back and forth along the heating column pipe; when dirt is attached to the outer wall of the heating column pipe, the scraper scrapes the dirt off the outer wall of the heating column pipe;

[0008] The heating column pipe is provided with an end portion spray cleaning device at both ends, and the scraper pushes part of the dirt to both ends of the heating column pipe, and the end portion spray cleaning device washes the dirt accumulated at both ends of the heating column pipe off;

[0009] The evaporator body is provided with a hot well at the bottom;

[0010] The bottom of the evaporator body is provided with a bottom cleaning screw device, which can rotate clockwise and counterclockwise, scrape off the dirt accumulated at the bottom of the evaporator body, and push the dirt to fall into the hot well.

[0011] Further, the column pipe cleaning device comprises a scraper component, the scraper component comprising a scraper frame, the scraper frame being connected with a first bolt and a second bolt;

[0012] The first bolt is sleeved with a first spring, and the first bolt is threadedly connected with a first nut;

[0013] The second bolt is sleeved with a second spring, and the second bolt is threadedly connected with a second nut;

[0014] The scraper is movably connected with the first bolt and the second bolt;

[0015] The first spring is located on the side of the scraper close to the heating column pipe, and the second spring is located on the side of the scraper away from the heating column pipe;

[0016] The positions of the first spring and the second spring are arranged such that an included angle is formed between the scraper and the heating column pipe.

[0017] Further, the scraper is provided with a first long hole and a second long hole;

[0018] The first bolt is inserted into the first long hole, and the second bolt is inserted into the second long hole.

[0019] Further, the scraper component is connected to a moving frame, and the moving frame is connected to a driving assembly.

[0020] Further, the driving assembly comprises a motor, the motor being connected to a driving belt, and the driving belt being connected to the moving frame.

[0021] Further, one end of the hot well is connected to the raw liquid inlet, and the other end of the hot well is connected to the liquid spraying system and the end spraying device through the pump body.

[0022] Further, the liquid spraying system comprises a liquid uniform distribution pipeline, and the liquid uniform distribution pipeline is provided with no less than one spraying head below.

[0023] Further, a bottom cleaning screw device is arranged below the heating column pipe, the bottom cleaning screw device sweeps the dirt scraped off to the hot well, the dirt is deposited in the hot well, and the bottom of the hot well is connected to the concentrated liquid delivery pump.

[0024] Further, one side of the evaporator body is provided with a steam inlet, and the evaporator body is provided with a condensed water outlet near the lower end at both sides.

[0025] One end of the evaporator body away from the steam inlet is provided with a steam exhaust outlet.

[0026] Further, the upper end of the liquid spraying system is further provided with a non-condensable gas outlet.

[0027] Compared with the prior art, the utility model has the beneficial effects that:

[0028] 1. A movable scraper is arranged on the side of the heating column pipe, the scraper can scrape off the dirt attached to the outer wall of the heating column pipe, and the cleaning work of the scraper on the outer wall of the heating column pipe does not need to be stopped during the working process of the heating column pipe, so that the working time of the evaporator is not occupied, the physical cleaning method does not cause corrosion to the outer wall of the heating column pipe compared with the chemical cleaning method, and the dirt can be cleaned in time, so that the evaporator can be better maintained, and the service life of the evaporator is prolonged.

[0029] 2. The first spring and the second spring are arranged to abut against two positions of the scraper on both sides of the scraper, so that the cutting edge of the scraper can always be attached to the outer wall of the heating column pipe, and the dirt scraping effect is better.

[0030] 3. The liquid spraying system is arranged above the heating column pipe, and can flush away the dirt scraped off by the scraper, and the end spraying device is arranged at both ends of the heating column pipe, and can flush away the dirt pushed to both ends of the heating column pipe by the scraper during the movement, so that the heating column pipe is comprehensively cleaned. DETAILED DESCRIPTION

[0031] The accompanying drawings are used to provide a further understanding of the utility model, together with the embodiments of the utility model, to explain the utility model, and do not constitute a limitation on the utility model, and in the drawings:

[0032] Fig. 1It is the overall schematic view of the wastewater self-cleaning forced circulation evaporation device of the embodiment of the utility model;

[0033] Fig. 2 It is the top view of the wastewater self-cleaning forced circulation evaporation device of the embodiment of the utility model;

[0034] Fig. 3 It is the sectional view of the wastewater self-cleaning forced circulation evaporation device of the embodiment of the utility model;

[0035] Fig. 4 It is the structural schematic view of the tube bank cleaning device of the embodiment of the utility model;

[0036] Fig. 5 It is the structural schematic view of the scraper of the embodiment of the utility model.

[0037] In the figure: 1, liquid spraying system; 101, liquid uniform distribution pipeline; 102, spraying head; 2, driving assembly; 201, motor; 202, driving belt; 3, tube bank cleaning device; 301, moving frame; 302, scraper component; 3020, scraper frame; 3021, first bolt; 3022, first spring; 3023, first nut; 3024, second bolt; 3025, second spring; 3026, second nut; 3027, scraper; 302A, first long hole; 302B, second long hole; 4, heating tube bank; 5, raw liquid inlet; 6, hot well; 7, steam inlet; 8, condensed water outlet; 9, steam exhaust outlet; 10, end spray cleaning device; 11, bottom cleaning screw device; 12, concentrated liquid delivery pump; 13, non-condensable gas outlet. DETAILED DESCRIPTION

[0038] The preferred embodiments of the utility model are described below in conjunction with the drawings, and it should be understood that the preferred embodiments described herein are only used for describing and explaining the utility model, and are not used for limiting the utility model.

[0039] As Figs. 1 to 5As shown, a kind of high salt sewage self-cleaning forced circulation evaporator, including evaporator body, evaporator body includes heating column pipe 4 and column pipe cleaning device 3, column pipe cleaning device 3 includes scraper 3027, heating column pipe 4 is square tube, the blade of scraper 3027 is attached to the plane of heating column pipe 4, scraper 3027 can be moved back and forth along heating column pipe 4;When the dirt is attached to the outer wall of heating column pipe 4, scraper 3027 passes through the outer wall of heating column pipe 4 and scrapes down dirt, in the process of working of heating column pipe 4, the cleaning work of scraper 3027 to the outer wall of heating column pipe 4 also does not need to stop, so it does not occupy the working time of evaporator, and this physical cleaning method will not cause corrosion to the outer wall of heating column pipe 4 compared with chemical cleaning method, and dirt can be cleaned in time, so that the evaporator can be better maintained, and the service life of the evaporator is prolonged.

[0040] Liquid spraying system 1 is provided above heating column pipe 4, and the liquid spraying system 1 includes liquid uniform distribution pipeline 101, and the liquid uniform distribution pipeline 101 is provided with not less than one spray head 102 below, the spray head 102 sprays liquid to heating column pipe 4, and end portion spray washing device 10 is provided at both ends of heating column pipe 4, and the scraper 3027 pushes part of dirt to both ends of heating column pipe 4, and the dirt accumulated at both ends of heating column pipe 4 is washed off by end portion spray washing device 10. Therefore, heating column pipe 4 can be cleaned comprehensively.

[0041] Column pipe cleaning device 3 includes scraper component 302, the scraper component 302 includes scraper frame 3020, the first bolt 3021 and the second bolt 3024 are connected to the scraper frame 3020;The first spring 3022 is sleeved on the first bolt 3021, and the first nut 3023 is threadedly connected to the first bolt 3021;The second spring 3025 is sleeved on the second bolt 3024, and the second nut 3026 is threadedly connected to the second bolt 3024;The scraper 3027 is movably inserted with the first bolt 3021 and the second bolt 3024;The first spring 3022 is located at one side of the scraper 3027 close to the heating column pipe 4, and the second spring 3025 is located at one side of the scraper 3027 away from the heating column pipe 4;The positions of the first spring 3022 and the second spring 3025 are arranged to form an included angle between the scraper 3027 and the heating column pipe 4, so that the blade of the scraper 3027 can always be attached to the outer wall of the heating column pipe 4, so that the effect of scraping dirt is better, and the angle between the scraper 3027 and the heating column pipe 4 can be adjusted by adjusting the first nut 3023 and the second nut 3026, so as to adjust the scraping effect and the wear speed of the scraper 3027, and the first spring 3022 and the second spring 3025 also generate a certain pressure on the scraper 3027, so that the scraper 3027 can be tightly attached to the outer wall of the heating column pipe 4, to achieve better scraping effect.

[0042] The scraper 3027 is provided with a first long hole 302A and a second long hole 302B, the first bolt 3021 is inserted into the first long hole 302A, and the second bolt 3024 is inserted into the second long hole 302B. The first long hole 302A and the second long hole 302B can provide space for the first bolt 3021 and the second bolt 3024 to move when the scraper 3027 is adjusted in angle, so that the scraper 3027 can form an inclined angle with respect to the first bolt 3021 and the second bolt 3024, thereby enabling the scraper 3027 to form an inclined angle with the heating column pipe 4.

[0043] The scraper component 302 is connected to the moving frame 301, and the moving frame 301 is connected to the driving assembly 2. The driving assembly 2 includes a motor 201 connected to a driving belt 202, and the driving belt 202 is connected to the moving frame 301. The driving belt 202 is a synchronous belt or a chain. The driving assembly 2 can move the column cleaning device 3 back and forth along the length direction of the heating column pipe 4. The outer wall of the heating column pipe 4 is repeatedly scraped by the scraper 3027, and the dirt adhering to the outer wall of the heating column pipe 4 is timely removed.

[0044] The evaporator body is provided with a hot well 6 at the bottom. One end of the hot well 6 is connected to the raw liquid inlet 5, and the other end of the hot well 6 is connected to the liquid spraying system 1 and the end spraying device 10 through a pump body. The liquid for spraying enters from the raw liquid inlet 5, is transported to the liquid spraying system 1 and the end spraying device 10 after passing through the hot well 6, and the liquid after being sprayed by the liquid spraying system 1 and the end spraying device 10 10 finally flows back to the hot well 6. Therefore, the liquid for spraying can be recycled, saving resources for the spraying system.

[0045] The bottom cleaning screw device 11 is arranged inside the bottom side of the evaporator body. The bottom cleaning screw device 11 can be rotated forward or reversed, so as to sweep the scraped dirt into the hot well 6. The dirt is deposited in the hot well 6, so that the dirt at the bottom of the equipment is not deposited and hardened. The upper clear liquid in the hot well 6 is continuously transported to the liquid spraying system 1 and the end spraying device 10 for use. The bottom of the hot well 6 is connected to a concentrated liquid conveying pump 12. The dirt deposited at the bottom of the hot well 6 is finally conveyed to the next process by the concentrated liquid conveying pump 12.

[0046] One side of the evaporator body is provided with a steam inlet 7, and the other side of the evaporator body is provided with a condensed water outlet 8 near the lower end. Steam enters from the steam inlet 7, and condensed water flows out from the condensed water outlet 8 after being condensed.

[0047] The end of the evaporator body away from the steam inlet 7 is provided with a steam excess steam outlet 9, and the excess steam is discharged from the steam excess steam outlet 9.

[0048] The upper end of the liquid spraying system 1 is also provided with a non-condensable gas outlet 13, and the non-condensable gas generated in the liquid heating process is output from the non-condensable gas outlet 13 at the upper end of the liquid spraying system 1.

[0049] The device adopts a forced circulation operation mode, so that the raw liquid is heated through multiple cycles of passing through the heat well 6, the evaporator and finally returning to the heat well 6, so as to finally reach the set concentration rate.

[0050] It should be noted that the above is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacements for some technical features, but any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A self-cleaning forced circulation evaporation device for high-salinity wastewater, characterized by, The evaporator body comprises a heating column pipe (4) and a column pipe cleaning device (3), the column pipe cleaning device (3) comprises a scraper (3027), the heating column pipe (4) is a square pipe, the blade of the scraper (3027) is attached to the plane of the heating column pipe (4), and the scraper (3027) can move back and forth along the heating column pipe (4); when dirt is attached to the outer wall of the heating column pipe (4), the scraper (3027) scrapes the dirt off the outer wall of the heating column pipe (4); The heating column pipe (4) is provided with end washing devices (10) at both ends, and the scraper (3027) pushes part of the dirt to both ends of the heating column pipe (4), and the end washing devices (10) wash the dirt accumulated at both ends of the heating column pipe (4) off; The evaporator body is provided with a hot well (6) at the bottom. The bottom of the evaporator body is provided with a bottom cleaning screw device (11), which can rotate clockwise and counterclockwise, scrape off the dirt accumulated at the bottom of the evaporator body, and push the dirt to fall into the hot well (6).

2. The high salinity wastewater self-cleaning forced circulation evaporation device according to claim 1, wherein, The column pipe cleaning device (3) comprises a scraper component (302), which comprises a scraper frame (3020) connected with a first bolt (3021) and a second bolt (3024); The first bolt (3021) is sleeved with a first spring (3022), and the first bolt (3021) is threadedly connected with a first nut (3023); the second bolt (3024) is sleeved with a second spring (3025), and the second bolt (3024) is threadedly connected with a second nut (3026); the scraper (3027) is movably inserted with the first bolt (3021) and the second bolt (3024); The first spring (3022) is located on one side of the scraper (3027) close to the heating column pipe (4), and the second spring (3025) is located on the other side of the scraper (3027) away from the heating column pipe (4); The positions of the first spring (3022) and the second spring (3025) are arranged to form an included angle between the scraper (3027) and the heating column pipe (4).

3. The high salinity wastewater self-cleaning forced circulation evaporation device according to claim 2, characterized in that, The scraper (3027) is provided with a first long hole (302A) and a second long hole (302B); The first bolt (3021) is inserted into the first long hole (302A), and the second bolt (3024) is inserted into the second long hole (302B).

4. The high salinity wastewater self-cleaning forced circulation evaporation device according to claim 3, characterized in that, The scraper component (302) is connected to a moving frame (301), and the moving frame (301) is connected to a driving assembly (2).

5. The high salinity wastewater self-cleaning forced circulation evaporation device of claim 4, wherein, The driving assembly (2) comprises a motor (201) connected to a driving belt (202), and the driving belt (202) is connected to the moving frame (301).

6. The high salinity wastewater self-cleaning forced circulation evaporation device according to any one of claims 1 to 5, characterized in that, One end of the hot well (6) is connected to a raw liquid inlet (5), and the other end of the hot well (6) is connected to a liquid spraying system (1) and an end washing device (10) through a pump body.

7. The high salinity wastewater self-cleaning forced circulation evaporation device of claim 6, wherein, The liquid spraying system (1) comprises a liquid uniform distribution pipeline (101), and the liquid uniform distribution pipeline (101) is provided with not less than one spray head (102) below.

8. The high salinity wastewater self-cleaning forced circulation evaporation device according to claim 7, wherein, The bottom cleaning screw device (11) is arranged below the heating column pipe (4), and the bottom cleaning screw device (11) sweeps the scraped dirt into the hot well (6), the dirt is deposited in the hot well (6), and the bottom of the hot well (6) is connected with the concentrated liquid conveying pump (12).

9. The high salinity wastewater self-cleaning forced circulation evaporation device of any one of claims 1 to 5, 7 to 8, wherein, One side of the evaporator body is provided with a steam inlet (7), and the two sides of the evaporator body are provided with condensed water outlets (8) near the lower end; The evaporator body is provided with a steam exhaust outlet (9) at one end away from the steam inlet (7).

10. The high salinity wastewater self-cleaning forced circulation evaporation device of claim 7, wherein, The upper end of the liquid spraying system (1) is also provided with a non-condensable gas outlet (13).

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