Refuse leachate back-spraying device of refuse incineration power plant

Abstract

The utility model discloses a garbage leachate back-spraying device of a garbage incineration power plant, a garbage incinerator is arranged in the garbage incineration power plant, a smoke punch is arranged on the garbage incinerator, a concentration device comprises a cylinder body with an upper opening and a lower opening, the cylinder body is arranged at a smoke outlet of the smoke punch or is connected in the smoke punch in series, and a filler area is arranged in the cylinder body. A plurality of air channels communicated with the upper end and the lower end of the barrel are formed in the filler area, a water distribution pipe with one end extending out of the barrel is arranged above the filler area, a plurality of water outlets are formed in the water distribution pipe, a water receiving mechanism is arranged below the filler area, and a water drainage pipe is connected to the water receiving mechanism; a water tank is arranged outside the barrel, a first water pump is arranged in the water tank, an outlet of the first water pump is connected with the water distribution pipe, and the water outlet end of the drainage pipe is connected with the water tank. The waste incineration power plant leachate treatment system has the advantages that the waste incineration power plant leachate treatment cost can be reduced, complaints are avoided, it is ensured that the flue gas emission temperature reaches the standard, and flue gas heat is prevented from being wasted again.

Description

Technical Field

[0001] The utility model relates to a garbage leachate backspray device for a garbage incineration power plant. Background Art

[0002] A garbage incineration power plant is a power plant that uses recycled garbage as the main fuel for power generation. The garbage has a high humidity and will produce a large amount of leachate when stored in the yard. These leachates contain a large amount of bacteria and heavy metals and belong to a kind of hazardous waste. They need to be treated before being discharged. The main responsibility of the power plant is power generation and generally does not involve the treatment of leachate. Usually, the leachate is concentrated and transported to the corresponding sewage treatment company for treatment by the sewage treatment company. However, there are the following problems. First, a large amount of odor is generated due to the fermentation of the leachate, which will be emitted along the transportation route during transportation, affecting the people along the line, resulting in a series of complaints and being unfavorable to the normal operation of the power plant. Second, a large amount of garbage is often stored in the power plant, the output of leachate is large, and correspondingly, a large amount of transportation costs are generated. Moreover, the treatment price of leachate is calculated according to volume. The generation of a large amount of leachate leads to the power plant having to pay a high fee to the sewage treatment company.

[0003] In addition, according to the relevant regulations in the "Air Pollution Prevention and Control Law" and the "Atmospheric Pollutant Discharge Standards", the temperature of the flue gas discharged from a garbage incineration power plant shall not exceed 200 °C. To meet the above requirements, without deliberately increasing the height of the chimney, the power plant generally installs a heat exchanger in the chimney. The heat exchanger absorbs the heat of the flue gas and is generally used for two purposes. First, heating domestic water. However, due to the odor inevitably generated by the garbage stored in the garbage incineration power plant, the power plant is generally located far from residential areas. When the domestic water is transported over a long distance to a distant residential area, the temperature will drop significantly and it is not feasible. Therefore, it can only be used by the power plant workers. However, the water consumption of the power plant workers is far less than the amount of hot water produced, resulting in the recovered heat being basically wasted. Especially in summer, the heated domestic water is basically allowed to cool naturally, resulting in heat waste. Second, heating air. The heated air is sent into the furnace of the garbage incinerator, which can increase the furnace temperature and thus improve the power generation efficiency. However, the specific heat capacity of air is low and the heating speed is slow. It is difficult to reduce the temperature of the flue gas below 200 °C and still needs to be used in combination with heating domestic water, which will still cause heat waste. Therefore, how to recover the heat of the flue gas, make the temperature of the discharged flue gas meet the requirements, and find a proper use for the recovered heat of the flue gas to avoid the waste of the recovered heat again is also an urgent problem to be solved in the current industry. Summary of the Utility Model

[0004] The object of the present utility model is to provide a garbage leachate backspray device for a waste incineration power plant. The present utility model has the advantages of being able to reduce the treatment cost of leachate in a waste incineration power plant, avoid complaints, ensure that the flue gas emission temperature meets the standard, and avoid the waste of flue gas heat again.

[0005] The technical solution of the present utility model: A garbage leachate backspray device for a waste incineration power plant. There is a waste incinerator in the waste incineration power plant, and a chimney is provided on the waste incinerator. The concentration device includes a cylinder body with openings at both the upper and lower ends. The cylinder body is arranged at the smoke exhaust port of the chimney or connected in series in the chimney. There is a packing area with a height of 1.5 - 2.5 meters in the cylinder body. Multiple air channels communicating the upper and lower ends of the cylinder body are formed in the packing area. Above the packing area, there is a water distribution pipe with one end extending out of the cylinder body. A plurality of water outlets are provided on the water distribution pipe. Below the packing area, there is a water receiving mechanism, and a drain pipe extending out of the cylinder body is connected to the water receiving mechanism.

[0006] In the aforementioned garbage leachate backspray device for a waste incineration power plant, a water tank is provided on the outer side of the cylinder body. A first water pump is provided in the water tank. The outlet of the first water pump is connected to the water distribution pipe, and the water outlet end of the drain pipe is connected to the water tank.

[0007] In the aforementioned garbage leachate backspray device for a waste incineration power plant, the water tank is connected with a water inlet pipe and an overflow pipe, and a second water pump is connected to the water inlet pipe.

[0008] In the aforementioned garbage leachate backspray device for a waste incineration power plant, the packing in the packing area is a plurality of spheres. A plurality of uniformly distributed support rods are provided on the outer peripheral surface of the spheres. A mesh plate connecting the cylinder body is provided at the bottom of the packing area.

[0009] In the aforementioned garbage leachate backspray device for a waste incineration power plant, a material taking door and a feeding door are provided on the side wall of the cylinder body. The material taking door and the feeding door are respectively located on the upper and lower sides of the packing area.

[0010] In the aforementioned garbage leachate backspray device for a waste incineration power plant, the water receiving mechanism includes a conical spiral water guide plate. Baffle plates are provided on both sides of the water guide plate. The upper part of the water guide plate expands radially outwards and is connected to the inner side wall of the cylinder body. The lower end of the water guide plate contracts radially inwards and is connected to a water receiving tray. A drain pipe is provided at the bottom of the water receiving tray. Looking from the axial direction of the cylinder body, the water receiving mechanism covers the entire inner hole of the cylinder body.

[0011] In the aforementioned garbage leachate backspray device for a waste incineration power plant, a branch flue pipe is provided on the outer side of the cylinder body. The upper end of the branch flue pipe is connected to the cylinder body and is located above the packing area. The lower end of the branch flue pipe is connected to the cylinder body and is located below the packing area. A valve is provided on the cylinder body.

[0012] In the aforementioned garbage incineration power plant garbage leachate back-injection device, air pressure sensors are provided on both sides of the valve and are located inside the branch flue pipe. The air pressure sensors and the valve are both connected to a controller.

[0013] In the aforementioned garbage incineration power plant garbage leachate back-injection device, the inner diameter of the cylinder is more than 1.5 times the inner diameter of the chimney. An annular water tank is provided at the bottom of the cylinder. The outer side wall of the water tank fits the inner side wall of the cylinder, and the inner wall of the water tank is close to the chimney.

[0014] Compared with the prior art, the present utility model comprehensively considers the actual situation of the garbage incineration power plant, uses the flue gas discharged from the garbage incinerator to concentrate the leachate, and a packing area is arranged in the chimney. When the leachate falls and passes through the packing area, the packing area can not only delay the falling speed of the leachate, increase the heating time of the leachate, but also enable the leachate to form a large-area water film, increase the evaporation area, and form a countercurrent with the high-temperature flue gas and be impacted by the high-speed hot air flow, thereby increasing the water evaporation speed and enabling the leachate to be greatly concentrated. Since the volume of the leachate is reduced after concentration, the transportation cost is reduced, and the cost paid to the sewage treatment company is reduced, that is, the treatment cost of the leachate by the power plant is reduced. Since the leachate is heated at a high temperature by the flue gas, the odor components in the leachate will also volatilize, and the bacteria in the leachate will also be killed. The leachate has a small odor for a long time in the subsequent period and will not affect the people along the line during transportation, avoiding complaints and being beneficial to the normal operation of the power plant. Moreover, a large amount of heat is required during the concentration process of the leachate. On the basis of ensuring that the flue gas emission temperature meets the standard, the heat recovered from the flue gas is prevented from being wasted again, providing a new way to use the recovered flue gas heat. Therefore, the present utility model has the advantages of being able to reduce the treatment cost of the garbage incineration power plant leachate, avoid complaints, ensure that the flue gas emission temperature meets the standard, and avoid wasting the flue gas heat again.

[0015] In addition, through further improvement, the present utility model further improves the concentration effect of the leachate, reduces the maintenance frequency, and increases the convenience during maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the present utility model.

[0017] Figure 2 is a schematic structural diagram of the sphere of the present utility model.

[0018] Figure 3 is a schematic connection diagram of the controller.

[0019] The reference numerals in the drawings are: 1 - chimney, 2 - cylinder body, 3 - packing area, 4 - water distribution pipe, 5 - water outlet, 6 - drain pipe, 7 - water tank, 8 - first water pump, 9 - controller, 10 - water inlet pipe, 11 - overflow pipe, 12 - second water pump, 13 - sphere, 14 - support rod, 15 - screen plate, 16 - material taking door, 17 - feeding door, 18 - water guide plate, 19 - water baffle, 20 - water receiving tray, 21 - branch flue pipe, 22 - valve, 23 - air pressure sensor, 24 - water tank, 25 - alarm device. Detailed implementation mode

[0020] The present invention will be further described below in conjunction with the drawings and embodiments, but it shall not be used as a basis for limiting the present invention.

[0021] Embodiment 1. A device for spraying back garbage leachate in a garbage incineration power plant. A garbage incinerator is provided in the garbage incineration power plant, and a chimney 1 is provided on the garbage incinerator, as Figure 1 shown. The concentration device includes a cylinder body 2 with openings at both the upper and lower ends. The cylinder body 2 is arranged at the smoke exhaust port of the chimney 1 or connected in series in the chimney 1. Preferably, the cylinder body 2 is connected in series in the chimney 1. Generally, a flue gas treatment device is provided in support of the chimney 1. Since there are also some harmful components in the flue gas generated by garbage incineration, it needs to be treated by the flue gas treatment device to meet the emission requirements. The cylinder body 2 is arranged on the front side of the flue gas treatment device, and the flue gas first passes through the cylinder body 2 and then through the flue gas treatment device.

[0022] A 2-meter-high packing area 3 is provided inside the cylinder body 2. Multiple air channels communicating the upper and lower ends of the cylinder body 2 are formed inside the packing area 3. A water distribution pipe 4 with one end extending out of the cylinder body 2 is provided above the packing area 3. A plurality of water outlets 5 are provided on the water distribution pipe 4. A water receiving mechanism is provided below the packing area 3, and a drain pipe 6 extending out of the cylinder body 2 is connected to the water receiving mechanism.

[0023] A water tank 7 is provided outside the cylinder body 2. The water tank 7 is located on the horizontal side of the cylinder body 2. A first water pump 8 is provided inside the water tank 7. The outlet of the first water pump 8 is connected to the water distribution pipe 4, and the water outlet end of the drain pipe 6 is connected to the water tank 7.

[0024] The water tank 7 is connected with a water inlet pipe 10 and an overflow pipe 11, and a second water pump 12 is connected to the water inlet pipe 10.

[0025] The packing in the packing area 3 is a plurality of spheres 13 with a diameter of 2 cm. A plurality of uniformly distributed support rods 14 with a length of 1 cm are provided on the outer peripheral surface of the spheres 13. A screen plate 15 is provided at the bottom of the packing area 3, and a bracket fixed to the cylinder body 2 can be provided at the bottom of the screen plate 15, and the screen plate 15 is placed on the bracket.

[0026] A material taking door 16 and a feeding door 17 are provided on the side wall of the cylinder body 2. The material taking door 16 and the feeding door 17 are respectively located on the upper and lower sides of the packing area 3.

[0027] The water receiving mechanism includes a water guiding plate 18 in the shape of a conical spiral. Baffle plates 19 are provided on both sides of the water guiding plate 18. The height of the baffle plates 19 is less than the pitch of the water guiding plate 18, so that a passage through which flue gas passes is formed between the upper and lower coils of the water guiding plate 18. The upper part of the water guiding plate 18 expands radially outwards and is connected to the inner side wall of the cylinder body 2. The lower end of the water guiding plate 18 contracts radially inwards and is connected with a water receiving tray 20. A drain pipe 6 is provided at the bottom of the water receiving tray 20. Looking from the axial direction of the cylinder body 2, the water receiving mechanism covers the entire inner hole of the cylinder body 2.

[0028] A branch flue pipe 21 is provided on the outer side of the cylinder body 2. The upper end of the branch flue pipe 21 is connected to the cylinder body 2 and is located above the packing area 3. The lower end of the branch flue pipe 21 is connected to the cylinder body 2 and is located below the packing area 3. A valve 22 is provided on the cylinder body 2, and the valve 22 is an electric type.

[0029] Pressure sensors 23 located in the branch flue pipe 21 are provided on both sides of the valve 22. The first water pump 8, the second water pump 12, the pressure sensors 23 and the valve 22 are all connected to a controller 9, and a photoelectric alarm device 25 is connected to the controller 9.

[0030] In order to facilitate the smooth passage of flue gas through the cylinder body 2, the inner diameter of the cylinder body 2 is more than 1.5 times the inner diameter of the chimney 1.

[0031] An annular water tank 24 is provided at the bottom of the cylinder body 2. The outer side wall of the water tank 24 fits the inner side wall of the cylinder body 2, and the inner wall of the water tank 24 is close to the chimney 1. It is found in the test process that although the water guiding plate 18 and the water receiving tray 20 cover the entire inner hole of the cylinder body 2 from top view upwards, under the impact of the rising flue gas, a small amount of leachate will still escape the interception of the water receiving mechanism and enter the chimney 1. To avoid affecting the incinerator furnace chamber, a water tank is provided at the bottom of the cylinder body 2 to intercept a part of the leakage liquid, and the intercepted leachate will be evaporated by heat and disappear.

[0032] Example 2. Regarding the usage method of Example 1, collect the leachate in a waste incineration power plant in a container, and pump the leachate into the water tank 7 through the second water pump 12. This is a continuous conveying process. Continuously stop pumping the leachate in the water tank 7 into the cylinder body 2 through the first water pump 8. Under the action of gravity, the leachate passes through the packing area, forms a water film, and collides with the rising high-temperature flue gas to evaporate the water therein. The leachate is concentrated, and the flue gas is cooled. The concentrated leachate returns to the water tank 7. Set the volumetric flow rate of the second water pump 12 to one-third of the volumetric flow rate of the first water pump 8, so that the water inlet speed of the water tank 7 is three times the water replenishment speed of the drain pipe 6 to the water tank 7. The leachate will pass through the packing area 3 several times. After several times of concentration, it is then discharged from the overflow pipe 11, and the discharged leachate can be transported to the sewage treatment company.

[0033] Since the leakage liquid contains impurities, when the air duct in the packing area 3 is too small, the packing area 3 is prone to blockage. Therefore, support rods 14 are provided on the packing in the packing area 3, that is, on the spheres 13, to increase the distance between the packings, expand the air duct, make the packing area 3 not easily blocked, and reduce the maintenance frequency.

[0034] The valve 22 is in a normally closed state. Under normal circumstances, the flue gas passes through the cylinder body 2. At this time, the air pressures on both sides of the valve 22 are close. When the controller 9 detects through the air pressure sensor 23 that the air pressure difference on both sides of the valve 22 reaches a certain value, it indicates that the packing area 3 is blocked. The controller stops the first water pump 8 and the second water pump 12, opens the valve 22, allows the flue gas to pass through the branch flue pipe 21, and issues a warning through the alarm device 25 to prompt the worker that the packing needs to be processed. There are two ways to process it as follows:

[0035] The first way: First, pump the acid liquid into the water tank 7 through the second water pump 12. To reduce waste, the acid liquid should not flow out of the overflow pipe 11. Then, make the acid liquid in the water tank 7 circulate through the packing area 3 through the first water pump 8 to dredge the packing area 3 and pickle the packing. After pickling for a period of time, close the valve 22 through the controller 9. If the alarm device 25 does not issue a warning, it means that the packing area 3 has been dredged to a sufficient degree, the air pressures on both sides of the valve 22 are close, and the controller 9 starts the first water pump 8 and the second water pump 12, puts the second water pump 12 into the leachate container, and continues to concentrate the leachate. On the contrary, if the alarm device 25 still issues a warning after the controller 9 closes the valve 22 and the first water pump 8 and the second water pump 12 cannot be started, it means that the packing area 3 cannot be restored to dredge only by pickling, and the second way needs to be used to process the packing. In the first way, the original structure of the concentration device can be used to dredge the packing area 3, which is convenient and labor-saving for workers to operate and makes the maintenance convenient.

[0036] The second way: Open the material taking door 16, take out all the packings and then close it. Open the feeding door 17, supplement new packings into the packing area 3 and then close it. The taken-out packings can be restored for use by methods such as vibration pickling and high-pressure water gun flushing, or they can also be directly discarded. It is found in actual use that the packing area 3 needs to be processed in the second way once after being processed in the first way 5 - 8 times.

[0037] After testing, the concentration ratio of the leachate discharged from the overflow pipe 11 is about 40%, that is, each liter of leachate becomes 0.4 liters after concentration.

[0038] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

Claims

1. A garbage leachate backspray device for a waste incineration power plant, characterized in that: It includes a concentration device. There is a waste incinerator in the waste incineration power plant, and a chimney (1) is provided on the waste incinerator. The concentration device includes a cylinder body (2) with openings at both the upper and lower ends. The cylinder body (2) is arranged at the smoke exhaust port of the chimney (1) or connected in series in the chimney (1). A packing area (3) with a height of 1.5 - 2.5 meters is provided in the cylinder body (2). Multiple air channels communicating the upper and lower ends of the cylinder body (2) are formed in the packing area (3). Above the packing area (3), there is a water distribution pipe (4) with one end extending out of the cylinder body (2). A plurality of water outlets (5) are provided on the water distribution pipe (4). Below the packing area (3), there is a water receiving mechanism, and a drain pipe (6) extending out of the cylinder body (2) is connected to the water receiving mechanism.

2. The garbage leachate backspray device of the waste incineration power plant according to claim 1, wherein: A water tank (7) is provided outside the cylinder body (2). A first water pump (8) is provided in the water tank (7). The outlet of the first water pump (8) is connected to the water distribution pipe (4), and the water outlet end of the drain pipe (6) is connected to the water tank (7).

3. The garbage leachate backspray device for a waste incineration power plant according to claim 2, characterized in that: The water tank (7) is connected with a water inlet pipe (10) and an overflow pipe (11). A second water pump (12) is connected to the water inlet pipe (10).

4. The garbage leachate back-injection device of the waste incineration power plant according to claim 1, characterized in that: The packing in the packing area (3) is a plurality of spheres (13). A plurality of uniformly distributed support rods (14) are provided on the outer peripheral surface of the spheres (13). A net plate (15) connecting the cylinder body (2) is provided at the bottom of the packing area (3).

5. The refuse incineration power plant refuse leachate back-injection device according to claim 4, characterized in that: A material taking door (16) and a feeding door (17) are provided on the side wall of the cylinder body (2). The material taking door (16) and the feeding door (17) are respectively located on the upper and lower sides of the packing area (3).

6. The device for recycling and spraying landfill leachate in a waste incineration power plant according to claim 1, wherein: The water receiving mechanism includes a conical spiral water guide plate (18). Baffle plates (19) are provided on both sides of the water guide plate (18). The upper part of the water guide plate (18) expands radially outwards and is connected to the inner side wall of the cylinder body (2). The lower end of the water guide plate (18) contracts radially inwards and is connected to a water receiving tray (20). A drain pipe (6) is provided at the bottom of the water receiving tray (20). Viewed from the axial direction of the cylinder body (2), the water receiving mechanism covers the entire inner hole of the cylinder body (2).

7. The garbage leachate backspray device of a garbage incineration power plant according to claim 1, characterized in that: A branch smoke pipe (21) is provided outside the cylinder body (2). The upper end of the branch smoke pipe (21) is connected to the cylinder body (2) and is located above the packing area (3). The lower end of the branch smoke pipe (21) is connected to the cylinder body (2) and is located below the packing area (3). A valve (22) is provided on the cylinder body (2).

8. The garbage leachate backspray device of the waste incineration power plant according to claim 7, characterized in that: Pressure sensors (23) are provided on both sides of the valve (22) and are located in the branch smoke pipe (21). Both the pressure sensors (23) and the valve (22) are connected to a controller (9).

9. The refuse leachate back-injection device for a refuse incineration power plant according to claim 7, wherein: The inner diameter of the cylinder body (2) is more than 1.5 times the inner diameter of the chimney (1). An annular water tank (24) is provided at the bottom of the cylinder body (2). The outer side wall of the water tank (24) fits the inner side wall of the cylinder body (2), and the inner wall of the water tank (24) is close to the chimney (1).

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