Feeding device for co-firing sludge and municipal solid waste

Abstract

This utility model provides a feeding device for co-firing sludge and municipal solid waste, relating to the field of sludge treatment devices. It includes a first sludge bin filled with sludge of 75%–85% moisture content and a second sludge bin filled with sludge of 55%–65% moisture content. A set of discharge components is respectively installed at the bottom of the first and second sludge bins. Downstream of one set of discharge components is a sludge pumping component, and downstream of the other set of discharge components is a scraper conveying component. A two-fluid spray gun is installed at the end of the sludge pumping component, and a discharge plate is installed at the end of the scraper conveying component. The nozzle of the two-fluid spray gun and the discharge plate both face the feed hopper, used to uniformly mix sludge and municipal solid waste. This alleviates the technical problems of existing technologies, such as the lack of differentiated feeding for sludge with different moisture contents and the impact of improper sludge feeding methods on the operation of the incineration system. It achieves the effects of preventing sludge from entering the waste incinerator in clumps, controlling the feeding amount, and increasing the sludge co-firing capacity of the waste incineration plant.

Description

Technical Field

[0001] This utility model relates to the technical field of sludge treatment devices, and in particular to a feeding device for co-firing sludge and municipal solid waste. Background Technology

[0002] Municipal solid waste incineration power generation technology has become the main method of solid waste treatment; however, municipal sludge, as a by-product of residential life, must be incinerated in accordance with the standards for municipal solid waste incineration. Therefore, the existing municipal solid waste incineration system can be used to co-process sludge to solve part of the sludge treatment and disposal problem.

[0003] In the prior art, Chinese patent CN209068519U, published on July 5, 2019, discloses a feeding device for co-firing sludge in a municipal solid waste incinerator. It designs a feeding method for dry sludge: controlling the uniformity and amount of dry sludge feeding through a slide valve and a star-shaped ash discharge valve on the discharge chute, transporting the dry sludge to the waste feed hopper and mixing it with municipal solid waste before entering the furnace. This achieves quantitative feeding of dry sludge, ensuring uniform co-firing of sludge into the municipal solid waste incinerator.

[0004] However, existing technologies directly feed sludge into the waste feed hopper, causing dry sludge to enter the incinerator in streams, exacerbating ash accumulation and coking within the furnace, and increasing the risk of a surge in instantaneous SO2 levels in the flue gas. Therefore, existing technologies lack differentiated feeding methods for sludge with varying moisture contents, making it difficult to ensure uniform co-firing of sludge and municipal solid waste while mitigating adverse effects on the incineration system's operation. Utility Model Content

[0005] The purpose of this invention is to provide a feeding device for co-firing sludge and municipal solid waste, so as to alleviate the technical problems in the prior art that there is no differentiated feeding for sludge with different moisture contents, and that improper sludge feeding methods affect the operation of the incineration system.

[0006] This utility model provides a feeding device for co-firing sludge and municipal solid waste, comprising: a first sludge bin, a second sludge bin, a discharge assembly, a sludge pumping assembly, a two-fluid spray gun, a scraper conveying assembly, a discharge plate, and a feed hopper;

[0007] The first sludge bin is filled with sludge with a moisture content of 75% to 85%, and the second sludge bin is filled with sludge with a moisture content of 55% to 65%. A set of discharge components is set at the bottom of the first and second sludge bins respectively. The downstream of one set of discharge components is connected to a sludge pumping component, and the downstream of the other set of discharge components is connected to a scraper conveying component.

[0008] The sludge pumping assembly is equipped with a two-fluid spray gun at its end, and the scraper conveying assembly is equipped with a discharge plate at its end. The nozzle of the two-fluid spray gun and the discharge plate both face the feed hopper, which is used to uniformly mix sludge and domestic waste.

[0009] Furthermore, the discharge assembly includes a discharge pipe, a screw conveyor, and a gate valve;

[0010] One end of the discharge pipe is connected to the first or second sludge bin, and the other end of the discharge pipe is connected to the feed inlet of the screw conveyor. A slide gate valve is installed on the discharge pipe.

[0011] Furthermore, the sludge pumping assembly includes a transfer pump, a transfer pipe, a sludge pipe, and an electric valve;

[0012] The conveying pump is used to receive sludge from the discharge port of the screw conveyor. The conveying pump is connected to the conveying pipe, which is located above the feed hopper and has several sludge pipes vertically arranged. Each sludge pipe is connected to a two-fluid spray gun at the end opposite to the conveying pipe, and an electric valve is installed on the sludge pipe.

[0013] Furthermore, the angle α between the nozzle of the two-fluid spray gun and the horizontal plane at the top of the feed hopper is 30° to 45°.

[0014] Furthermore, the scraper conveyor assembly includes a scraper conveyor, a chute, and a knife gate;

[0015] The scraper conveyor is used to receive sludge from the discharge port of the screw conveyor. Several chutes are vertically installed above the feed hopper of the scraper conveyor. Each chute has a discharge plate at one end away from the scraper conveyor and a knife gate is installed on the chute.

[0016] Furthermore, the included angle β between the discharge plate and the chute is 120° to 165°.

[0017] Furthermore, the unloading plate is evenly provided with unloading ports, which are strip-shaped and have a width of 10-15cm.

[0018] Beneficial effects:

[0019] The feeding device for co-firing sludge and municipal solid waste provided by this utility model includes a first sludge bin filled with sludge with a moisture content of 75% to 85%, and a second sludge bin filled with sludge with a moisture content of 55% to 65%. A set of discharge components is respectively installed at the bottom of the first and second sludge bins. Downstream of one set of discharge components is a sludge pumping component, and downstream of the other set of discharge components is a scraper conveying component. A two-fluid spray gun is installed at the end of the sludge pumping component, and a discharge plate is installed at the end of the scraper conveying component. The nozzle of the two-fluid spray gun and the discharge plate both face the feed hopper, used to mix the sludge with municipal solid waste.

[0020] This invention is designed for storing wet sludge with a moisture content of 75% to 85% and semi-dry sludge with a moisture content of 55% to 65% separately, and conveying them through different components to adapt to the characteristics of the sludge and ensure smooth conveying. In addition, the amount of sludge can be controlled through the discharge component.

[0021] The sludge pumping assembly, paired with a two-fluid spray gun, and the scraper conveying assembly, paired with a discharge plate, can evenly distribute sludge with different moisture contents onto municipal solid waste, preventing sludge from entering the furnace in clumps, reducing adverse effects on the incineration system, improving the uniformity of mixing sludge and municipal solid waste, and enhancing the co-incineration effect. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the feeding device for co-firing sludge and municipal solid waste provided in an embodiment of this utility model;

[0024] Figure 2 A side view of a sludge pumping assembly for co-firing sludge and municipal solid waste provided in an embodiment of this utility model;

[0025] Figure 3 A side view of a scraper conveying assembly for co-firing sludge and municipal solid waste provided in an embodiment of this utility model;

[0026] Figure 4 This is a schematic diagram of the unloading plate in the feeding device for co-firing sludge and municipal solid waste provided in an embodiment of the present invention.

[0027] Icons: 1 - First sludge bin; 2 - Second sludge bin; 3 - Discharge assembly; 301 - Discharge pipe; 302 - Screw conveyor; 303 - Gate valve; 4 - Sludge pumping assembly; 401 - Conveying pump; 402 - Conveying pipe; 403 - Sludge pipe; 404 - Electric valve; 5 - Two-fluid spray gun; 6 - Scraper conveyor assembly; 601 - Scraper conveyor; 602 - Chute; 603 - Knife gate; 7 - Discharge plate; 701 - Discharge port; 8 - Feed hopper. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0033] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0035] This utility model provides a feeding device for co-firing sludge and municipal solid waste, comprising: a first sludge bin 1, a second sludge bin 2, a discharge assembly 3, a sludge pumping assembly 4, a two-fluid spray gun 5, a scraper conveying assembly 6, a discharge plate 7, and a feed hopper 8.

[0036] The first sludge bin 1 is filled with sludge with a moisture content of 75% to 85%, and the second sludge bin 2 is filled with sludge with a moisture content of 55% to 65%. A set of discharge components 3 is respectively installed at the bottom of the first sludge bin 1 and the second sludge bin 2. The downstream of one set of discharge components 3 is connected to the sludge pumping component 4, and the downstream of the other set of discharge components 3 is connected to the scraper conveying component 6.

[0037] The sludge pumping assembly 4 is equipped with a two-fluid spray gun 5 at its end, and the scraper conveying assembly 6 is equipped with a discharge plate 7 at its end. The nozzle of the two-fluid spray gun 5 and the discharge plate 7 both face the feed hopper 8, which is used to uniformly mix sludge and domestic waste.

[0038] Specifically, such as Figure 1 , Figure 2 and Figure 3 As shown, the first sludge bin 1 and the second sludge bin 2 are arranged side-by-side, in sections, or separately. Both are closed containers with open tops, used to store sludge with different moisture contents: the first sludge bin 1 is filled with sludge with a moisture content of 75%–85%, preferably 80%, which has good fluidity and is in a semi-liquid or slurry state; the second sludge bin 2 is filled with sludge with a moisture content of 55%–65%, preferably 60%, which has poor fluidity and is in a semi-solid or cake state. Both sludge bins are equipped with sludge discharge slides at the bottom to facilitate pushing the sludge into the discharge assembly 3. Each sludge bin has a set of discharge assemblies 3 at the bottom. The downstream of the discharge assembly 3 of the first sludge bin 1 is directly connected to the inlet of the sludge pumping assembly 4, and the pitch and speed of the discharge screw are adjusted according to the fluidity of the high-moisture-content sludge to avoid clogging; the downstream of the discharge assembly 3 of the second sludge bin 2 is connected to the inlet of the scraper conveying assembly 6, and the discharge screw is adjusted according to the crushing and pushing of the low-fluidity sludge.

[0039] The inlet of the sludge pumping assembly 4 is connected downstream of the discharge assembly 3 under the first sludge bin 1; the conveying pipe extends vertically or inclined to the top of the feed hopper 8, and its end is connected to a two-fluid spray gun 5. The nozzle of the spray gun faces the domestic waste accumulation area inside the feed hopper 8, and the spray angle of the two-fluid spray gun 5 is adjustable to ensure that the coverage area of ​​the mist sludge matches the size of the feed hopper. The inlet of the scraper conveyor assembly 6 is connected downstream of the discharge assembly 3 under the second sludge bin 2; the scraper conveyor is arranged horizontally or inclined to push low-flow sludge to the front of the feed hopper 8, and its end is connected to a discharge plate 7 to control the sludge flow rate. The discharge plate 7 is a rectangular or arc-shaped flat plate installed above the feed hopper 8.

[0040] The nozzle of the two-fluid spray gun 5 and the surface of the unloading plate 7 both face the inside of the feed hopper 8. The two-fluid spray gun 5 ensures that the high moisture content sludge falls evenly onto the surface of the domestic waste in the feed hopper 8 in the form of a mist and the unloading plate 7 ensures that the low moisture content sludge falls evenly into the furnace for co-firing.

[0041] This invention is compatible with sludge from two typical moisture content ranges (common 55%–85% moisture content for municipal sludge). It eliminates the need for additional drying or conditioning treatment, achieving efficient co-firing directly through a differentiated conveying device, reducing pretreatment costs and improving the incineration plant's adaptability to sludge from different sources. For high-moisture-content sludge, a sludge pumping assembly 4 and a two-fluid spray gun 5 are used to atomize the sludge with compressed air, avoiding localized accumulation caused by sludge transport in streams. Simultaneously, the contact area between the atomized sludge and municipal solid waste is maximized, improving mixing uniformity and reducing the risk of ash accumulation and coking in the incinerator. For low-moisture-content sludge, a scraper conveying assembly 6 and a discharge plate 7 are used. The scraper conveyor pushes the sludge to overcome its low fluidity, while the discharge plate 7 disperses the sludge into fine streams, preventing lumpy sludge from concentrating and entering the incinerator.

[0042] The two sludge bins are fed independently, and the amount of sludge co-firing in each incinerator is controlled by a gate valve 303, avoiding problems such as furnace temperature fluctuations and sudden surges in SO2 values ​​caused by excessive or uneven sludge. The spray angle of the two-fluid spray gun 5 and the tilt angle of the discharge plate 7 ensure that the sludge covers the entire cross-section of the waste, achieving "surface contact" mixing. The discharge assembly 3 can adjust the sludge delivery rate in real time according to the calorific value and moisture content of the municipal solid waste. Combined with the control of the wet sludge conveying pump assembly 4 or the scraper conveying assembly 6, compared with traditional grab bucket manual mixing, it avoids the randomness and unevenness of manual operation, reduces the workload of operators, and improves the system operating efficiency.

[0043] In an embodiment of this utility model, the discharge assembly 3 includes a discharge pipe 301, a screw conveyor 302, and a gate valve 303;

[0044] One end of the discharge pipe 301 is connected to the first sludge bin 1 or the second sludge bin 2, and the other end of the discharge pipe 301 is connected to the feed inlet of the screw conveyor 302. A slide valve 303 is installed on the discharge pipe 301.

[0045] The sludge pumping assembly 4 includes a conveying pump 401, a conveying pipe 402, a sludge pipe 403, and an electric valve 404;

[0046] The conveying pump 401 is used to receive sludge from the discharge port of the screw conveyor 302. The conveying pump 401 is connected to the conveying pipe 402. The conveying pipe 402 is located above the feed hopper 8 and has several sludge pipes 403 vertically arranged. Each sludge pipe 403 is connected to a two-fluid spray gun 5 at one end away from the conveying pipe 402. An electric valve 404 is installed on the sludge pipe 403.

[0047] The angle α between the nozzle of the two-fluid spray gun 5 and the top horizontal plane of the feed hopper 8 is 30° to 45°.

[0048] Specifically, the discharge pipe 301 has a tubular structure, with one end connected to the bottom of either the first sludge bin 1 or the second sludge bin 2 via sealed welding or flange connection to ensure no leakage of sludge during transport. The other end of the discharge pipe 301 is positioned above the inlet of the screw conveyor 302, ensuring that sludge can fall directly into the inlet of the screw conveyor 302 by gravity. A gate valve 303 is installed on the discharge pipe 301, located near the sludge bin. The valve plate is horizontally movable and used to control the opening and closing of the discharge pipe 301. When the gate valve 303 is open, sludge from the sludge bin can enter the screw conveyor 302 through the discharge pipe 301; when closed, it prevents sludge from flowing out, facilitating control of the sludge transport volume. The screw conveyor 302 includes helical blades and a rotating shaft driven by a motor. The inlet corresponds to the discharge pipe 301, and the discharge outlet is used to discharge the sludge that has been transported and initially agitated. The screw conveyor 302 quantitatively transports sludge falling from the discharge pipe 301. The conveying speed and quantity of sludge can be controlled by adjusting the motor speed. The slide valve 303 can flexibly control the sludge discharge, and can promptly cut off the sludge flow during equipment maintenance or adjustments to the sludge delivery rate. The screw conveyor 302 can quantitatively transport sludge, reducing the risk of blockage and leakage.

[0049] Below the first sludge bin 1, the inlet of the conveying pump 401 is connected to the outlet of the screw conveyor 302. The conveying pump 401 is connected to the conveying pipe 402, which extends vertically or inclined to the top of the feed hopper 8. Several sludge pipes 403, preferably two or three, are vertically arranged above the feed hopper 8 on the conveying pipe 402. Each sludge pipe 403 has one end connected to a two-fluid spray gun 5, and the connection is detachable. An electric valve 404 is installed on the sludge pipe 403, located near the two-fluid spray gun 5. The valve is electrically controlled to open and close, controlling the amount of sludge entering the two-fluid spray gun 5. The conveying pump 401 overcomes the resistance of the wet sludge in the pipe, lifting the wet sludge above the feed hopper 8. Multiple sludge pipes 403 increase the number of sludge discharge points, making the sludge distribution above the feed hopper 8 more uniform.

[0050] The angle α between the extended line of the nozzle direction of the two-fluid spray gun 5 and the horizontal plane at the top of the feed hopper 8 is 30° to 45°. The two-fluid spray gun 5 is installed above the feed hopper 8 to ensure that the sprayed sludge is evenly distributed on the domestic waste inside the feed hopper 8. This nozzle angle allows the sludge to fall in a parabolic trajectory after being sprayed, covering a large area inside the feed hopper 8 and achieving thorough mixing with the domestic waste.

[0051] In an embodiment of this utility model, the scraper conveying assembly 6 includes a scraper conveyor 601, a chute 602, and a knife gate 603;

[0052] The scraper conveyor 601 is used to receive sludge from the discharge port of the screw conveyor 302. The scraper conveyor 601 is vertically arranged above the feed hopper 8 with several chutes 602. Each chute 602 has a discharge plate 7 arranged at one end away from the scraper conveyor 601, and a knife gate 603 is provided on the chute 602.

[0053] The included angle β between the unloading plate 7 and the chute 602 is 120° to 165°.

[0054] The unloading plate 7 has unloading ports 701 evenly distributed on it. The unloading ports 701 are strip-shaped and the width of the unloading ports 701 is 10-15cm.

[0055] Specifically, on one side of the second sludge bin 2, the inlet of the scraper conveyor 601 is connected to the outlet of the screw conveyor 302. The scraper conveyor 601 is driven by a motor-driven chain with scrapers mounted on it. Driven by the motor, the scrapers move within the trough along with the chain, thus pushing the sludge along the conveying direction of the scraper conveyor 601. The conveying direction of the scraper conveyor 601 is parallel to the long axis of the feed hopper 8. On the side of the scraper conveyor 601 near the feed hopper 8, several chutes 602 are vertically arranged, preferably two or three. The chutes 602 are tubular, and knife-type gates 603 are installed on the chutes 602. The knife-type gates 603 are installed near the scraper conveyor 601, and the amount of sludge entering the chutes 602 is controlled manually or electrically by opening and closing the knife-type gates 603. The scraper conveyor 601 can effectively transport semi-dry sludge with poor flowability. Through the pushing action of the scraper, the stickiness of the sludge is overcome, ensuring that the sludge is smoothly transported to the top of the feed hopper 8.

[0056] The discharge plate 7 is installed at the end of the chute 602 opposite to the scraper conveyor 601, and the included angle β between the discharge plate 7 and the chute 602 is 120° to 165°. The discharge plate 7 is fixed to the chute 602 by welding or bolting. Figure 4 As shown, discharge ports 701 are evenly distributed on the discharge plate 7. These discharge ports 701 are evenly distributed along the surface of the discharge plate 7, and the spacing between them can be adjusted according to the size of the feed hopper 8 and the actual mixing requirements, so that the sludge falling from the chute 602 can be evenly distributed onto the domestic waste in the feed hopper 8 through the discharge ports 701. The inclination angle between the discharge plate 7 and the chute 602 allows the sludge to slide smoothly down the surface of the discharge plate 7 under the action of gravity, without accumulating at the connection between the discharge plate 7 and the chute 602, ensuring smooth discharge of the sludge.

[0057] Based on the above embodiments, the specific working process of the feeding device for co-firing sludge and municipal solid waste provided by this utility model is as follows:

[0058] The sludge with a high moisture content of 75% to 85% in the first sludge bin 1 is quantitatively conveyed to the transfer pump 401 after the gate valve 303 is opened. The transfer pump 401 pumps the sludge into the transfer pipe 402. The sludge with a moisture content of 55% to 65% in the second sludge bin 2 is conveyed to the scraper conveyor 601, which delivers the sludge to the chute 602.

[0059] In the sludge pumping assembly 4, the electric valve 404 on the conveying pipe 402 controls the amount of sludge entering the sludge pipe 403, and the sludge reaches the two-fluid spray gun 5. In the scraper conveying assembly 6, the knife gate 603 on the chute 602 adjusts the sludge flow rate entering the chute 602, so that the sludge reaches the discharge plate.

[0060] The two-fluid spray gun 5 atomizes the sludge with high water content and sprays it into the feed hopper 8, covering the municipal solid waste. The sludge with low water content is dispersed into a fine stream through the discharge port 701 and falls evenly onto the waste in the feed hopper 8, completing the mixing of sludge and municipal solid waste, and then they enter the incinerator together for incineration.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A sludge and domestic waste blending feeding device, characterized in that, include: First sludge bin (1), second sludge bin (2), discharge assembly (3), sludge pumping assembly (4), two-fluid spray gun (5), scraper conveying assembly (6), unloading plate (7) and feed hopper (8); The first sludge bin (1) is filled with sludge with a water content of 75% to 85%, and the second sludge bin (2) is filled with sludge with a water content of 55% to 65%. A set of discharge components (3) is respectively provided at the bottom of the first sludge bin (1) and the second sludge bin (2). The downstream of one set of discharge components (3) is connected to the sludge pumping component (4), and the downstream of the other set of discharge components (3) is connected to the scraper conveying component (6). The sludge pumping assembly (4) is provided with the two-fluid spray gun (5) at its end, and the scraper conveying assembly (6) is provided with the unloading plate (7) at its end. The nozzle of the two-fluid spray gun (5) and the unloading plate (7) both face the feed hopper (8) and are used to uniformly mix sludge and domestic waste.

2. The feeding device for co-firing sludge and municipal solid waste according to claim 1, characterized in that, The discharge assembly (3) includes a discharge pipe (301), a screw conveyor (302), and a gate valve (303); One end of the discharge pipe (301) is connected to the first sludge bin (1) or the second sludge bin (2), and the other end of the discharge pipe (301) is connected to the feed inlet of the screw conveyor (302). The discharge pipe (301) is equipped with the slide valve (303).

3. The feeding device for co-firing sludge and municipal solid waste according to claim 2, characterized in that, The sludge pumping assembly (4) includes a conveying pump (401), a conveying pipe (402), a sludge pipe (403), and an electric valve (404); The conveying pump (401) is used to receive the sludge from the outlet of the screw conveyor (302). The conveying pump (401) is connected to the conveying pipe (402). The conveying pipe (402) is vertically arranged above the feed hopper (8) with several sludge pipes (403). One end of each sludge pipe (403) away from the conveying pipe (402) is connected to the two-fluid spray gun (5). The sludge pipe (403) is equipped with the electric valve (404).

4. The feeding device for co-firing sludge and municipal solid waste according to claim 3, characterized in that, The angle α between the nozzle of the two-fluid spray gun (5) and the top horizontal plane of the feed hopper (8) is 30° to 45°.

5. The feeding device for co-firing sludge and municipal solid waste according to claim 2, characterized in that, The scraper conveying assembly (6) includes a scraper conveyor (601), a chute (602), and a knife gate (603); The scraper conveyor (601) is used to receive the sludge from the discharge port of the screw conveyor (302). The scraper conveyor (601) is vertically arranged with several chutes (602) above the feed hopper (8). The discharge plate (7) is arranged at one end of each chute (602) away from the scraper conveyor (601). The knife gate (603) is provided on the chute (602).

6. The feeding device for co-firing municipal solid waste according to claim 5, characterized in that, The included angle β between the unloading plate (7) and the chute (602) is 120° to 165°.

7. The feeding device for co-firing municipal solid waste according to claim 6, characterized in that, The unloading plate (7) is provided with unloading ports (701) evenly distributed. The unloading ports (701) are strip-shaped and the width of the unloading ports (701) is 10-15cm.

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