Concentrated leachate back-spraying device and garbage incinerator

Abstract

The utility model discloses a concentrated leachate back-spraying device and a garbage incinerator. The concentrated percolate back-spraying device is used for spraying concentrated percolate into a first flue of the garbage incinerator, a temperature measuring device is arranged above an inlet of the first flue, the temperature measuring device is used for measuring the temperature of the inlet of the first flue, and the concentrated percolate back-spraying device comprises a concentrated liquid storage device, a back-spraying pump and at least one concentrated liquid spraying gun layer; the concentrated liquid spray gun layers are arranged on the first flue and located above the temperature measuring device, each concentrated liquid spray gun layer comprises a plurality of spray guns with the same height, and each concentrated liquid spray gun layer is distributed on at least one of the front wall, the left wall and the right wall of the first flue; the concentrated liquid storage device is communicated with the back-spraying pump, and the back-spraying pump is communicated with each spraying gun. When the device is applied, the concentrated leachate atomized and sprayed by the spray gun does not easily influence the temperature at the temperature measuring point at the inlet of the first flue, so that the treatment efficiency of the concentrated leachate can be improved, and the heat distribution of the first flue can be easily adjusted by using the concentrated leachate.

Description

Technical Field

[0001] The present application relates to the technical field of garbage disposal, and in particular to a leachate concentrate back-spraying device and a garbage incinerator. Background Art

[0002] During the storage, transfer, transportation and stacking of garbage, various metabolites and water are produced due to the biochemical degradation of anaerobic fermentation, rainwater washing and organic matter decomposition, forming a highly complex organic wastewater - garbage leachate. After treatment, the leachate produces a concentrated solution, also known as leachate concentrate. The leachate concentrate is often sprayed into the garbage incinerator by spraying through a spray gun for treatment.

[0003] A flue structure is usually connected above the furnace of a waste incinerator. The flue structure may include a first flue, a second flue, and a third flue arranged in sequence along the direction of flue gas flow. Flue gas first enters the first flue from the furnace, flows from bottom to top along the first flue, then flows from top to bottom along the second flue, and finally flows from bottom to top along the third flue. In the related art, an inlet temperature measuring point is usually set at a certain distance above the inlet of the first flue, a temperature measuring device is used at the inlet temperature measuring point to measure the inlet temperature of the first flue, and a spray gun is respectively set on the left wall and the right wall below the inlet temperature measuring point, and the spray gun is used to spray the concentrated leachate into the waste incinerator in atomized form. In order to ensure that harmful substances in the garbage are fully burned and decomposed, the temperature in the furnace and the part of the area above the first flue entrance needs to be controlled above a relatively high preset value. The leachate concentrate spray gun is located below the inlet temperature measurement point. Before the flue gas generated by the garbage combustion moves upward to the inlet temperature measurement point, it will be cooled by the atomized leachate concentrate sprayed in, which may cause the temperature at the inlet temperature measurement point to drop below the preset value. In this way, the inlet temperature measurement value is difficult to truly reflect the combustion of the garbage entering the furnace, which is easy to cause system misjudgment. The temperature at the inlet temperature measurement point may be increased by reducing or even shutting down the leachate concentrate spray gun, which will reduce the treatment efficiency of the leachate concentrate and make it difficult to use the leachate concentrate to adjust the heat distribution of the first flue.

[0004] Therefore, how to provide a solution to overcome or alleviate the above-mentioned defects is still a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0005] The purpose of the present application is to provide a leachate concentrate back-spraying device to improve the treatment efficiency of the leachate concentrate. Another purpose of the present application is to provide a garbage incinerator.

[0006] In order to solve the above technical problems, the present application provides a leachate concentrate back-spraying device, which is used to spray leachate concentrate into a first flue of a waste incinerator, wherein the first flue is located above the furnace of the waste incinerator, a second flue is arranged behind the first flue, a temperature measuring device is arranged above the inlet of the first flue, and the temperature measuring device is used to measure the inlet temperature of the first flue, and comprises a concentrate storage device, a back-spraying pump and at least one layer of concentrate spray gun;

[0007] All the concentrated liquid spray gun layers are arranged in the first flue and above the temperature measuring device, each of the concentrated liquid spray gun layers comprises a plurality of spray guns of the same height, and each of the concentrated liquid spray gun layers is distributed in at least one of the front wall, the left wall and the right wall of the first flue;

[0008] The concentrated liquid storage device is communicated with the back-spray pump, and the back-spray pump is communicated with each of the spray guns.

[0009] Optionally, the vertical distance from the lowest layer of the concentrated liquid spray gun layer to the entrance of the first flue is defined as H1, and the vertical distance from the ceiling of the first flue to the entrance of the first flue is defined as H2, and H1≥2H2 / 3.

[0010] Optionally, each layer of the concentrated liquid spray guns is distributed on the front wall, the left wall and the right wall, and a plurality of the spray guns are arranged on each layer of the front wall, the left wall and the right wall.

[0011] Optionally, a plurality of the spray guns in each layer of any one of the front wall, the left wall and the right wall are arranged at equal intervals with a spacing a.

[0012] Optionally, the spacing a is 1.5m-2m.

[0013] Optionally, the spray gun has a fan-shaped nozzle.

[0014] Optionally, the central angle of the nozzle of the spray gun is 30°-150°.

[0015] Optionally, the spray gun includes a gun rod and a nozzle which are interconnected; the gun rod is made of 310S stainless steel, and / or the nozzle is made of Hastelloy C-276.

[0016] Optionally, a controller is also included;

[0017] The liquid inlet of the concentrated liquid storage device is connected to a leachate delivery pipeline, and the liquid outlet is connected to a concentrated liquid delivery main pipeline, the concentrated liquid delivery main pipeline and each of the spray guns are connected through a concentrated liquid delivery branch pipeline, and the leachate delivery pipeline, the concentrated liquid delivery main pipeline, and the concentrated liquid delivery branch pipeline are respectively provided with a first control valve, a second control valve, and a third control valve;

[0018] The controller is connected to the first control valve, the second control valve, the third control valve, and the back-spray pump.

[0019] The present application also provides a waste incinerator, comprising the furnace, the first flue, the second flue and the leachate concentrate back-spraying device.

[0020] The leachate concentrate back-spraying device provided in the present application is provided with a concentrate storage device, a back-spraying pump and at least one layer of concentrate spray guns. All the concentrate spray guns are arranged in the first flue of the waste incinerator and are located above the inlet temperature measuring device of the first flue. Each layer of concentrate spray guns includes a plurality of spray guns of the same height, and each layer of concentrate spray guns is distributed in at least one of the front wall, the left wall and the right wall of the first flue. When in use, since the spray gun is located above the inlet temperature measuring device, the leachate concentrate sprayed by the spray gun is not easy to affect the temperature at the inlet temperature measuring point of the first flue, so that the inlet temperature measurement value of the first flue can truly reflect the combustion situation of the garbage entering the furnace, so that it is basically unnecessary to adjust the inlet temperature of the first flue by adjusting the flow rate of the leachate concentrate spray gun, which can improve the processing efficiency of the leachate concentrate and easily adjust the heat distribution of the first flue by using the leachate concentrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of the leachate concentrate back-spraying device of the embodiment provided in the present application.

[0022] The reference numerals in the above drawings are described as follows:

[0023] 1- concentrated liquid storage device;

[0024] 2-Backjet pump;

[0025] 3-spray gun, 31-gun rod, 32-nozzle;

[0026] 4-first flue, 41-front wall, 42-left wall, 43-right wall;

[0027] 51 - first control valve, 52 - second control valve, 53 - third control valve, 54 - fourth control valve;

[0028] 6-Leachate delivery pipeline;

[0029] 71- concentrate delivery main pipeline, 72- concentrate delivery branch pipeline;

[0030] 81-gas transmission main pipeline, 82-gas transmission branch pipeline. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0032] It should be noted that: in this application, the direction of the first flue of the garbage incinerator relative to the second flue is defined as "front", the direction opposite to "front" is defined as "rear", and the two sides corresponding to the front and rear directions on the horizontal plane are defined as left and right directions. Figure 1 It is understood that the positions of the concentrated liquid storage device 1 and the back-spray pump 2 are not limited to Figure 1 The position in.

[0033] The terms "first", "second", etc. mentioned in this application are only used to facilitate the description of two or more structures or components with the same or similar structures and / or functions, and do not imply any special limitation on the order and / or importance.

[0034] The term “several” as used in this application refers to an indefinite number of multiples, usually more than two; and when “several” is used to indicate the number of certain components, it does not indicate the quantitative relationship between these components.

[0035] In this application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] Please refer to Figure 1 , Figure 1 This is a schematic structural diagram of the leachate concentrate back-spraying device of the embodiment provided in the present application.

[0037] In the embodiment provided in the present application, the leachate concentrate back-spraying device is used to spray the leachate concentrate into the first flue 4 of the waste incinerator. The first flue 4 is located above the furnace (not shown in the figure) of the waste incinerator. A second flue (not shown in the figure) is arranged behind the first flue 4. A temperature measuring device (not shown in the figure) is arranged above the inlet of the first flue 4. The temperature measuring device is used to measure the inlet temperature of the first flue 4. Figure 1 It is understood that the leachate concentrate back-spray device includes a concentrate storage device 1, a back-spray pump 2 and at least one layer of concentrate spray guns; all concentrate spray gun layers are arranged in the first flue 4 and are located above the temperature measuring device; each concentrate spray gun layer includes a plurality of spray guns 3 of the same height, and each concentrate spray gun layer is distributed in at least one of the front wall 41, the left wall 42 and the right wall 43 of the first flue 4; the concentrate storage device 1 is connected to the back-spray pump 2, and the back-spray pump 2 is connected to each spray gun 3.

[0038] It can be understood that the above-mentioned first flue 4 is arranged above the furnace of the waste incinerator, and the second flue and the third flue (not shown in the figure) can be arranged in sequence behind the first flue 4, and the front side of the first flue 4 is the side away from the second flue. When in use, the concentrate storage device 1 can store leachate concentrate from the garbage leachate treatment station, and the back-spray pump 2 can pump the leachate concentrate in the concentrate storage device 1 into the spray gun 3, and the spray gun 3 can atomize the leachate concentrate and spray it into the first flue 4; after the garbage is burned in the furnace, flue gas is formed, and the flue gas enters the first flue 4 from the furnace through the entrance of the first flue 4, and then passes through the temperature measuring device above the entrance of the first flue 4, which measures the inlet temperature of the first flue 4, and then the flue gas continues to move upward, and the leachate concentrate droplets atomized by the spray gun 3 are evenly mixed with the flue gas, and a chemical reaction occurs to achieve the treatment of the leachate concentrate. At the same time, the temperature of the flue gas can also be reduced to adjust the heat distribution of the flue gas. The flue gas continues to move to the upper outlet of the first flue 4 and enters the second flue from the outlet for subsequent treatment.

[0039] In this process, since the spray gun 3 is located above the temperature measuring device at the entrance of the first flue 4, the leachate concentrate sprayed by the spray gun 3 is not easy to affect the inlet temperature of the first flue 4, so that the inlet temperature measurement value of the first flue 4 can truly reflect the combustion condition of the garbage inside the furnace, and there is basically no need to increase the inlet temperature by adjusting the injection flow rate of the spray gun 3, thereby improving the treatment efficiency of the leachate concentrate, and it is also easy to use the leachate concentrate to adjust the heat distribution of the first flue 4, so that the flue gas passing through the first flue 4 is not easy to have too high temperature on one side and damage the flue wall or equipment in the flue.

[0040] In actual setting, the vertical distance from the lowest layer of the concentrate spray gun layer to the entrance of the first flue 4 is defined as H1, and the vertical distance from the ceiling of the first flue 4 to the entrance of the first flue 4 is defined as H2. H1 can be greater than or equal to 2H2 / 3. In this way, the leachate concentrate sprayed by the spray gun 3 will not easily affect the measurement of the inlet temperature of the first flue 4. When the inlet temperature is lower than the preset value, there is no need to increase the inlet temperature by reducing the flow rate of the leachate concentrate, so as to relatively ensure the treatment efficiency of the leachate concentrate. It can also relatively ensure that the area inside the first flue 4 between the inlet and the lowest layer of the concentrate spray gun layer maintains a higher temperature, so that the harmful substances in the flue gas can be fully decomposed. The leachate concentrate sprayed by the spray gun 3 can also be fully utilized to adjust the heat distribution of the first flue 4 and neutralize the harmful substances in the flue gas.

[0041] It is worth noting that the concentrate storage device 1 is used to store the leachate concentrate, and its structural form is not limited, for example, it can be a liquid storage tank, a liquid storage box, or a liquid storage pool.

[0042] In actual settings, each layer of concentrated liquid spray guns can be distributed on one, two, or three of the front wall 41, left wall 42 and right wall 43 of the first flue 4, without specific restrictions, and the number of spray guns 3 set in each layer of the front wall 41, left wall 42 and right wall 43 is also not limited.

[0043] As an alternative, please combine Figure 1 It is understood that each layer of concentrated liquid spray guns is distributed on the front wall 41 , the left wall 42 and the right wall 43 , and a plurality of spray guns 3 are arranged on each layer of the front wall 41 , the left wall 42 and the right wall 43 .

[0044] In this way, compared with the related technology, only one spray gun 3 is set on the left wall 42 and the right wall 43, resulting in a narrow coverage area of ​​the sprayed leachate concentrate, which cannot be fully and evenly mixed with the flue gas, the treatment efficiency of the leachate concentrate is low, and the adjustment effect of the heat distribution of the flue gas inside the first flue 4 is poor. In the embodiment of the present application, multiple spray guns 3 distributed on the front wall 41, the left wall 42 and the right wall 43 can spray leachate concentrate into the interior of the first flue 4 from multiple locations on the three walls, so that the leachate concentrate covers a wider range, the leachate concentrate droplets can be mixed with the flue gas more evenly, the treatment efficiency of the leachate concentrate is improved, and the emission of harmful gases is reduced. It can also optimize the heat distribution of the flue gas inside the first flue 4, making the heat distribution of the flue gas more uniform, and it is less likely to have a high temperature on one side and damage the flue wall and the internal equipment of the flue, thereby extending the service life of the waste incinerator and realizing the efficient and environmentally friendly operation of the waste incinerator.

[0045] In the embodiment of the present application, multiple spray guns 3 are arranged at equal intervals of a in each layer of the front wall 41, the left wall 42 and the right wall 43. In this way, the injection of the leachate concentrate can be more uniform, the mixing between the leachate concentrate and the flue gas can be more uniform, the treatment efficiency of the leachate concentrate can be higher, and the heat distribution of the flue gas inside the first flue 4 can be more uniform.

[0046] It is understood that the above spacing a is not limited. As an optional solution, the spacing a is between 1.5m and 2m, so that adjacent spray guns 3 are not easily interfered with and the coverage of the concentrated leachate is relatively guaranteed.

[0047] It is worth noting that the concentrated liquid spray gun layer can be one layer or two or more layers, and there is no specific limitation. When there are two or more concentrated liquid spray gun layers, the two or more concentrated liquid spray gun layers are arranged in sequence from bottom to top, and the spray guns 3 of adjacent concentrated liquid spray gun layers can be staggered, so that the injected leachate concentrated liquid covers the flue gas inside the first flue 4 as much as possible, and it is not easy to have a dead angle of injection.

[0048] In the embodiments of the present application, Figure 1As shown, a layer of concentrated liquid spray guns is provided for a first flue 4, and the concentrated liquid spray gun layer includes ten spray guns 3. Specifically, four spray guns 3 are provided on the front wall 41, and three spray guns 3 are provided on the left wall 42 and the right wall 43. In this way, the leachate concentrated liquid sprayed by the ten spray guns 3 evenly distributed on the front wall 41, the left wall 42 and the right wall 43 can basically cover the flue gas range at the corresponding position of the entire first flue 4, ensuring the uniformity of the distribution of the leachate concentrated liquid droplets.

[0049] In actual configuration, the nozzle shape of the spray gun 3 is not limited, for example, it can be conical, annular, or fan-shaped.

[0050] As an optional solution, the spray gun 3 has a fan-shaped nozzle. In this way, after the leachate concentrate is sprayed out through the nozzle of the spray gun 3, a fan-shaped fog field can be formed, so that the distribution of the atomized leachate concentrate in the first flue 4 is more uniform and the coverage is wider, which can not only make the mixing of the leachate concentrate and the flue gas more uniform, further improve the processing efficiency of the leachate concentrate, and further improve the adjustment effect of the leachate concentrate on the heat distribution of the flue gas inside the first flue 4, so that the heat distribution of the flue gas is more uniform, and the number of spray guns 3 can be reduced accordingly, reducing production costs.

[0051] Among them, the central angle of the fan-shaped nozzle of the spray gun 3 is not specifically limited. In the embodiment of the present application, the central angle is 30°-150°, which can relatively ensure the coverage range, spraying uniformity and spraying efficiency of the leachate concentrate.

[0052] In actual configuration, the specific structure of the spray gun 3 is not limited, for example, it can be a single-fluid spray gun or a dual-fluid spray gun.

[0053] In the embodiment provided in the present application, the spray gun 3 is a single fluid spray gun, and the spray gun 3 includes a gun rod 31 and a nozzle 32 which are interconnected. The gun rod 31 may include an air inlet pipe and a liquid inlet pipe, and the liquid inlet pipe may be sleeved inside the air inlet pipe, and the nozzle 32 may be connected to the liquid outlet of the liquid inlet pipe. The inlet of the liquid inlet pipe may be provided with a liquid inlet, and the end of the air inlet pipe close to the liquid inlet may be closed, and the end close to the nozzle 32 may be open, and the air inlet may be provided with an air inlet in the circumference of the air inlet pipe, and a flange may be provided outside the air inlet pipe. When installed, the gun rod 31 may be inserted into the wall corresponding to the first flue 4, and the nozzle 32 extends into the interior of the first flue 4, and the spray gun 3 is fixed to the wall by a flange. When in use, the concentrated leachate enters the liquid inlet pipe from the liquid inlet, and is sprayed out from the nozzle 32 in the form of mist by relying on the liquid pressure in the liquid inlet pipe. At the same time, compressed air may be introduced into the air inlet pipe from the air inlet, and sprayed out from the air outlet to cool the part of the gun rod 31 located in the first flue 4 and the nozzle 32. In this way, the injection effect of the concentrated leachate solution and the smooth operation of the spray gun 3 can be guaranteed, and the service life of the spray gun 3 can be extended.

[0054] When setting specifically, the material of the gun rod 31 and the nozzle 32 is not limited. In the embodiment of the present application, the gun rod 31 is made of 310S stainless steel, and the nozzle 32 is made of Hastelloy C-276. In this way, the gun rod 31 and the nozzle 32 have high strength, corrosion resistance and wear resistance. In the high temperature environment of 850℃-1100℃ usually set in the first flue 4, it is not easy to deform after working for a long time, and it is not easy to wear under the impact of flue gas with a large amount of dust and a fast flow rate, which prolongs the service life of the spray gun 3 and ensures the stability of the spray gun 3.

[0055] In specific settings, the spray gun 3 can also be set to have a telescopic function. When the actual working conditions inside the first flue 4 are different from the designed working conditions, the spray gun 3 can be telescopically controlled to control the length of the spray gun 3 extending into the first flue 4 to ensure the flue temperature and flue gas treatment efficiency. In addition, when a certain spray gun 3 is not needed, the spray gun 3 can also be controlled to withdraw from the first flue 4 to extend the service life of the spray gun 3.

[0056] In addition, the flow rate adjustment range of the spray gun 3 is set according to demand, for example, it can be set to 0-100 L / h, so as to better meet the injection flow rate requirements of the first flue 4 for the concentrated leachate.

[0057] In the embodiment provided in the present application, the leachate concentrate back-spraying device also includes a controller (not shown in the figure); the liquid inlet of the concentrate storage device 1 is connected to the leachate delivery pipeline 6, and the liquid outlet is connected to the concentrate delivery main pipeline 71, the concentrate delivery main pipeline 71 and each spray gun 3 are connected through the concentrate delivery branch pipeline 72, and the leachate delivery pipeline 6, the concentrate delivery main pipeline 71, and the concentrate delivery branch pipeline 72 are respectively provided with a first control valve 51, a second control valve 52, and a third control valve 53; the controller is connected to the first control valve 51, the second control valve 52, the third control valve 53, and the back-spraying pump 2.

[0058] In this way, the controller can be used to control the opening of the first control valve 51 to control the flow rate of the leachate concentrate entering the concentrate storage device 1; the controller can be used to control the opening of the second control valve 52 to control the total flow rate of the leachate concentrate supplied to each spray gun 3; the controller can also be used to control the opening of the third control valve 53 to control the liquid intake amount of the leachate concentrate in the corresponding spray gun 3, so as to efficiently adjust the distribution of the leachate concentrate spray in the first flue 4.

[0059] When the spray gun 3 is a single-fluid spray gun in the above embodiment, a gas delivery main pipeline 81 can also be provided. The gas delivery main pipeline 81 can be connected to the compressed air system of the waste incineration treatment station. The gas delivery main pipeline 81 and the air inlet of each spray gun 3 can be connected through a gas delivery branch pipeline 82. Figure 1As shown, the gas delivery branch pipeline 82 may be provided with a fourth control valve 54 , and each fourth control valve 54 may be connected to a controller to achieve efficient control of the compressed air intake volume of each spray gun 3 through the controller.

[0060] In an embodiment of the present application, a waste incinerator is also provided, including the furnace, the first flue, the second flue and the above-mentioned leachate concentrate back-spray device. The specific structure of the leachate concentrate back-spray device refers to the above-mentioned embodiment.

[0061] The garbage incinerator in the embodiment of the present application adopts the leachate concentrate back-spraying device in the above embodiment to back-spray the leachate concentrate. When in use, the garbage burns in the furnace to form flue gas, which enters the first flue 4 upward, first passes through the temperature measuring device above the entrance, and then passes through the concentrate spray gun layer. The inlet temperature of the first flue 4 is not easily affected by the leachate concentrate sprayed by the concentrate spray gun layer, that is, the inlet temperature measured by the temperature measuring device can truly reflect the combustion of the garbage entering the furnace. When the measured inlet temperature value is lower than the preset value, since the inlet temperature and the leachate concentrate have little relationship, the possible reason is basically the temperature reduction caused by the combustion of the garbage entering the furnace, so the way to increase the inlet temperature is basically to increase the amount of fuel put into the furnace, rather than reducing the flow rate of the leachate concentrate, so that the treatment efficiency of the leachate concentrate can be improved. At the same time, after the multiple spray guns 3 evenly distributed on the front wall 41, the left wall 42 and the right wall 43 atomize the leachate concentrate and spray it into the first flue 4, the leachate concentrate droplets cover a wide area inside the first flue 4 and are evenly distributed, and can be evenly mixed with the flue gas to fully undergo chemical reactions, thereby further improving the treatment efficiency of the leachate concentrate and reducing the emission of harmful gases. The evenly distributed leachate concentrate can also be used to optimize the heat distribution of the flue gas inside the first flue 4, making the heat distribution of the flue gas more even. The waste incinerator is not easily damaged by the high temperature on one side of the flue gas, has a longer service life, and can achieve more efficient and environmentally friendly treatment of waste.

[0062] The principles and implementation methods of the present application are described in this article using specific examples. The description of the above embodiments is only used to help understand the device and its core idea of ​​the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A leachate concentrate back-spraying device, used for spraying leachate concentrate into a first flue (4) of a waste incinerator, wherein the first flue (4) is located above the furnace of the waste incinerator, a second flue is arranged behind the first flue (4), a temperature measuring device is arranged above the inlet of the first flue (4), and the temperature measuring device is used for measuring the inlet temperature of the first flue (4), characterized in that: It comprises a concentrated liquid storage device (1), a back-spray pump (2) and at least one concentrated liquid spray gun layer; All the concentrated liquid spray gun layers are arranged in the first flue (4) and are located above the temperature measuring device, each of the concentrated liquid spray gun layers comprises a plurality of spray guns (3) of the same height, and each of the concentrated liquid spray gun layers is distributed on at least one of the front wall (41), the left wall (42) and the right wall (43) of the first flue (4); The concentrated liquid storage device (1) is connected to the back-spray pump (2), and the back-spray pump (2) is connected to each of the spray guns (3).

2. The leachate concentrate spray back device according to claim 1, characterized in that: The vertical distance from the bottom layer of the concentrated liquid spray gun to the entrance of the first flue (4) is defined as H1, and the vertical distance from the ceiling of the first flue (4) to the entrance of the first flue (4) is defined as H2, where H1≥2H2 / 3.

3. The leachate concentrate back-spraying device according to claim 1 or 2, characterized in that: Each layer of the concentrated liquid spray guns is distributed on the front wall (41), the left wall (42) and the right wall (43), and a plurality of the spray guns (3) are arranged on each layer of the front wall (41), the left wall (42) and the right wall (43).

4. The leachate concentrate spray back device according to claim 3, characterized in that: In each layer of any one of the front wall (41), the left wall (42) and the right wall (43), a plurality of the spray guns (3) are arranged at equal intervals with a spacing a.

5. The leachate concentrate spray back device according to claim 4, characterized in that: The distance a is 1.5m-2m.

6. The leachate concentrate spray back device according to claim 1 or 2, characterized in that: The spray gun (3) has a fan-shaped nozzle.

7. The leachate concentrate spray back device according to claim 6, characterized in that: The central angle of the nozzle of the spray gun (3) is 30°-150°.

8. The leachate concentrate spray back device according to claim 1 or 2, characterized in that: The spray gun (3) comprises a gun rod (31) and a nozzle (32) which are interconnected; the gun rod (31) is made of 310S stainless steel, and / or the nozzle (32) is made of Hastelloy C-276.

9. The leachate concentrate spray back device according to claim 1 or 2, characterized in that: Also includes a controller; The liquid inlet of the concentrated liquid storage device (1) is connected to a leachate delivery pipeline (6), and the liquid outlet is connected to a concentrated liquid delivery main pipeline (71); the concentrated liquid delivery main pipeline (71) and each of the spray guns (3) are connected via a concentrated liquid delivery branch pipeline (72); the leachate delivery pipeline (6), the concentrated liquid delivery main pipeline (71), and the concentrated liquid delivery branch pipeline (72) are respectively provided with a first control valve (51), a second control valve (52), and a third control valve (53); The controller is connected to the first control valve (51), the second control valve (52), the third control valve (53), and the back-spray pump (2).

10. A garbage incinerator, characterized in that: The invention comprises the furnace, the first flue (4), the second flue and the leachate concentrate back-spraying device according to any one of claims 1 to 9.

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