Sound insulation and noise reduction device for furnace mouth of black liquor spray gun of alkali recovery furnace

Abstract

The utility model discloses a sound insulation and noise reduction device for a furnace mouth of a black liquor spray gun of an alkali recovery furnace. The sound insulation and noise reduction device mainly comprises a left sound insulation door body, a right sound insulation door body and an air sealing device, the sound insulation door body is installed outside the furnace mouth in a push-pull or rotating mode and can be closed or opened to achieve the sound insulation and noise reduction effects. The door body is filled with multiple layers of sound insulation materials, and an avoiding notch is formed to contain the black liquor spray gun pipe and the air supply pipe. The air seal device comprises an air curtain spray pipe and an air supply pipe, the air supply pipe is connected with an external air source, air curtains are continuously sprayed into the furnace through the air curtain spray pipe, an air seal barrier is formed, and the sound insulation effect is further enhanced. The utility model aims at effectively reducing the noise at the furnace mouth of the black liquor spray gun of the alkali recovery furnace and simultaneously ensuring the normal operation of black liquor spraying and air sealing functions. The noise problem of the furnace mouth of the black liquor spray gun of the alkali recovery furnace is solved, the safety and comfort of the operation environment are improved, meanwhile, the sanitary condition of the site is improved, and the noise reduction device is an efficient, safe and practical sound insulation and noise reduction solution.

Description

Technical Field

[0001] The utility model relates to a noise control technology for equipment in production and manufacturing, in particular to a sound insulation and noise reduction device for a black liquor spray gun furnace mouth of an alkali recovery furnace. Background Art

[0002] The alkali recovery furnace is a key component in the design of an alkali recovery plant. Its primary function is to recover alkali liquor by burning organic matter produced during the alkali recovery process, simultaneously generating steam that can be used for power generation or other thermal energy needs. This process not only promotes resource recycling but also significantly reduces the plant's energy costs and environmental impact. To ensure the efficient operation of the alkali recovery furnace, the design requires special attention to the configuration of the black liquor injection system. Black liquor is a common byproduct in the papermaking industry, primarily composed of lignin, hemicellulose, and other dissolved organic matter. These substances are extracted during the alkali pulping process, forming a highly concentrated wastewater. Direct discharge without treatment would cause serious environmental pollution. Therefore, it is crucial to uniformly inject the black liquor into the alkali recovery furnace through a black liquor injection system for high-temperature combustion. Installing a dedicated alkali recovery furnace and equipping it with an efficient black liquor injection system in the alkali recovery plant is crucial for promoting resource recycling and energy conservation and emission reduction.

[0003] In actual implementation, holes are opened in the side walls of the alkali recovery furnace for injecting black liquor. However, the opening of the furnace mouth changes and affects the combustion conditions inside the furnace. If a gas seal is used, it will generate even greater noise, which will affect the floor, the area, and even further away. Domestic alkali recovery furnaces have not been effectively controlled to date, with only some modifications to the nozzles and adjustments to the steam pressure to reduce noise. However, these methods do not fundamentally solve the problem and instead cause backflow of smoke and dust from the furnace. Addressing this issue is the purpose of this utility model. Summary of the Invention

[0004] To address the shortcomings and drawbacks of the aforementioned existing technologies, the inventors' team, through research and development, have developed a noise-isolating device that significantly reduces furnace mouth noise. Without changing the existing black liquor injection structure and operating methods, the device offers ease of operation, excellent sound insulation, and safe and stable operation. This device not only provides sound insulation but also improves on-site hygiene. This device eliminates safety risks, enhances the operating environment, and ensures that occupational health standards are met.

[0005] Specifically, the present invention is implemented as follows: a sound insulation and noise reduction device for the black liquor spray gun furnace mouth of an alkali recovery furnace, comprising: a sound insulation door body comprising a left sound insulation door and a right sound insulation door, which are arranged on the outside of the black liquor spray gun furnace mouth of the alkali recovery furnace in a push-pull or rotating installation manner, can be closed or opened, and is used for sound insulation and noise reduction after closing; an air sealing device comprises an air curtain nozzle and an air supply pipe, the outer end of the air supply pipe is connected to an external air source, and the inner end is connected to the air curtain nozzle, and the air curtain nozzle is arranged at the furnace mouth and continuously sprays an air curtain toward the furnace; the black liquor spray gun pipe extends from the outside of the furnace mouth to the inside of the furnace mouth and is installed to spray black liquor into the furnace body, the left sound insulation door and the right sound insulation door are symmetrically arranged, forming a cabinet-like structure, and are provided with avoidance slots on the door body for avoiding the black liquor spray gun pipe and the air supply pipe; the door body material of the left sound insulation door and the right sound insulation door is made of multi-layer sound insulation material.

[0006] Furthermore, the soundproof door body includes a cabinet door panel, a cabinet top panel and a cabinet bottom panel, and the panels include, from the outside to the inside, an outer layer panel, a bottom sound-absorbing pad, a middle layer of sound-absorbing cotton, a top sound-absorbing pad, a frame, and a wire mesh; the frame serves as the overall framework of the panel structure, the wire mesh is bound to the frame to form an inner layer shielding, and the space between the outer layer panel and the wire mesh is used to fill the bottom sound-absorbing pad, the middle layer of sound-absorbing cotton and the top sound-absorbing pad.

[0007] Furthermore, the middle layer of sound-absorbing cotton includes a second layer of sound-absorbing cotton and a first layer of sound-absorbing cotton from the outside to the inside; the bottom sound-absorbing pad layer and the top sound-absorbing pad layer are made of sound-absorbing fiber material and are used to wrap the second layer of sound-absorbing cotton and the first layer of sound-absorbing cotton.

[0008] Furthermore, the avoidance slot includes a half slot provided on the edge of the cabinet door panel. When the left soundproof door and the right soundproof door are closed, the two slots can be aligned and overlapped on the cabinet door to form a spray gun avoidance slot, and the black liquor spray gun pipe can pass through the spray gun avoidance slot; a half slot is also provided on the edge of the cabinet top plate. When the left soundproof door and the right soundproof door are closed, the two slots can be aligned and overlapped on the cabinet top plate to form an air supply pipe avoidance slot; the air supply pipe can pass through the air supply pipe avoidance slot.

[0009] Furthermore, the half slots on the cabinet door panel and the cabinet top panel are provided with cushioning parts. After the cabinet door is closed, the cushioning parts can form contact with the black liquor spray gun or the air supply pipe to eliminate the gap between the pipe wall and the slot and improve the sound-absorbing effect.

[0010] Furthermore, the first layer of sound-absorbing cotton and the second layer of sound-absorbing cotton are made of rock wool or slag wool; the bottom sound-absorbing pad layer and the top sound-absorbing pad layer are made of silicate material.

[0011] Furthermore, the positions where the black liquor spray gun pipe and the air supply pipe enter the soundproof door body are exactly at the door gap of the soundproof door body.

[0012] Furthermore, the air supply pipe is connected to two air curtain nozzles through a three-way joint. The two air curtain nozzles are respectively placed on both sides of the furnace mouth. The air curtain nozzles are each provided with a plurality of air jets facing the furnace.

[0013] Furthermore, a plurality of small hole channels are provided on the cabinet door panel, cabinet top panel or cabinet bottom panel, and the small hole channels connect the inside and outside of the soundproof door body, and the shape of the small hole channels is a tapered channel structure in which the aperture gradually decreases from the outside to the inside.

[0014] Furthermore, the outer layer is a steel plate or iron plate with a thickness of 8 mm, the thickness of the multi-layer sound insulation material is 100-120 mm, and a handle is installed on the outer side of the cabinet door panel.

[0015] Working Principle: This utility model provides a soundproofing and noise reduction device for the black liquor spray gun furnace mouth of an alkali recovery furnace. The device comprises the following key components: an air seal comprising an air curtain nozzle and an air supply pipe. The air supply pipe is connected to an external air source. The air curtain nozzle is positioned at the furnace mouth and continuously sprays an air curtain into the furnace. This air curtain forms a barrier that isolates and protects the furnace from the outside, preventing the escape of dust and harmful gases, and also preventing smoke from escaping when the furnace is under positive pressure. Half a slot is provided on the edge of the cabinet door and top panel. When the left and right soundproof doors are closed, the two slots align and overlap to form a clearance for the spray gun and the air supply pipe. The soundproof door body, consisting of the left and right soundproof doors, is installed outside the furnace mouth using a sliding or rotating mechanism. It is constructed from multiple layers of soundproofing material, consisting, from outside to inside, of an outer panel, a bottom layer of sound-absorbing padding, a middle layer of sound-absorbing cotton, a top layer of sound-absorbing padding, a frame, and wire mesh. When closed, it creates a relatively enclosed space, effectively isolating noise. The multi-layer sound insulation material is composed of a middle layer of sound-absorbing cotton, a second layer of sound-absorbing cotton and a first layer of sound-absorbing cotton. Rock wool or slag wool is usually used. The bottom sound-absorbing pad layer and the top sound-absorbing pad layer are made of sound-absorbing fiber material (such as silicate material) to wrap the sound-absorbing cotton and enhance the overall sound absorption effect. In the preferred design, a cushion component is set in the slot to contact the black liquor spray gun pipe and the air supply pipe to eliminate the gap and improve the sound absorption effect. A number of small hole channels are opened on the cabinet door panel, cabinet top panel or cabinet bottom panel, which are in the shape of a conical channel structure, and the aperture gradually decreases from the outside to the inside. The small hole channel connects the inside and outside of the soundproof door body to cope with the air flow generated under the negative pressure formed when the air sealing device is sprayed, and at the same time, the obstacle design formed by the small holes can help reduce the linear propagation rate of noise waves to achieve a noise reduction effect. The utility model realizes effective sound insulation and noise reduction at the black liquor spray gun furnace mouth of the alkali recovery furnace through multi-layer sound insulation materials and air sealing devices, combined with the design of avoidance slots and small hole channels. The multi-layered material structure of the soundproof door absorbs and reflects sound waves. The entire system works together to significantly reduce noise levels during operation, improving the comfort and safety of the working environment.

[0016] Beneficial technical effects of the utility model:

[0017] (1) Significantly reduce furnace noise: Through the combination of multiple layers of sound insulation materials (outer board, bottom sound-absorbing pad, middle sound-absorbing cotton, top sound-absorbing pad, frame and wire mesh), a structurally stable cabinet door is formed, which also forms an efficient sound insulation barrier. Through effective sound insulation and noise reduction measures, the noise level at the operation site is significantly reduced, and the working comfort of the operators is improved.

[0018] (2) Good operational convenience: The soundproof door body is installed by pushing, pulling or rotating, which is convenient for opening and closing, and does not affect the existing black liquor injection structure and operation method. Avoidance grooves are set on the cabinet door panel and cabinet top panel to ensure that the black liquor spray gun pipe and the air supply pipe can pass through smoothly without affecting their normal operation. The design of multi-layer sound insulation materials and air sealing devices ensures the safety of the operating environment, and can cope with the relatively high ambient temperature of the furnace mouth, and can also cooperate with the air sealing device to prevent harmful gases from harming the operators; reduce the possibility of smoke leakage, improve the sanitary conditions on site, reduce the risk of exposure to harmful substances, and ensure occupational health standards. The materials and structural designs used have been optimized to ensure the safety of operation while ensuring the sound insulation effect.

[0019] In summary, this technical solution not only effectively solves the noise problem at the black liquor spray gun mouth of the alkali recovery furnace, but also improves the safety and comfort of the operating environment, while improving the sanitary conditions on site. It is an efficient, safe and practical sound insulation and noise reduction solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of an open state of a sound insulation and noise reduction device for a black liquor spray gun port of an alkali recovery furnace according to the utility model;

[0021] Figure 2 This is a schematic diagram of a closed state of a sound insulation and noise reduction device for a black liquor spray gun port of an alkali recovery furnace according to the utility model;

[0022] Figure 3 A structural perspective diagram of the sound insulation and noise reduction device of Example 1 or Example 2;

[0023] Figure 4 This is a schematic diagram of the location of the black liquor spray gun furnace port of the alkali recovery furnace of the utility model;

[0024] Figure 5 This is a schematic diagram of the structure of the black liquor spray gun furnace mouth gas sealing device of the utility model for an alkali recovery furnace;

[0025] Figure 6 This is a schematic diagram of the internal structure of a plate of a sound insulation and noise reduction device for a black liquor spray gun furnace port of an alkali recovery furnace according to the utility model;

[0026] Figure 7 for Figure 6 A schematic diagram of the partially enlarged structure of part I;

[0027] Figure 8 This is a schematic diagram of the structure of a multi-layer sound-absorbing material for a sound insulation and noise reduction device for a black liquor spray gun port of an alkali recovery furnace according to the present invention;

[0028] Figure 9 This is a schematic diagram of the use status of the black liquor spray gun furnace mouth gas sealing device of the alkali recovery furnace of the utility model;

[0029] in:

[0030] 1—Left soundproof door,

[0031] 2—right soundproof door,

[0032] 10 - outer layer, 11 - bottom sound-absorbing pad, 12 - top sound-absorbing pad, 13 - frame, 14 - wire mesh, 15 - second layer of sound-absorbing cotton, 16 - first layer of sound-absorbing cotton,

[0033] 20-spray gun avoidance port, 21-air supply pipe avoidance port, 22-cushion component, 23-small hole channel, 24-handle,

[0034] 3-air sealing device, 31-air curtain nozzle, 32-air supply pipe,

[0035] 4—Black liquor spray gun tube. DETAILED DESCRIPTION

[0036] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are merely illustrative and are not intended to limit the scope of the present invention. Furthermore, descriptions of known structures and technologies are omitted in the following description to avoid unnecessary confusion regarding the concepts of the present invention.

[0037] Example 1: A sound insulation and noise reduction device for the black liquor spray gun mouth of an alkali recovery furnace

[0038] Its basic structure includes:

[0039] The left soundproof door 1 and the right soundproof door 2 are installed outside the black liquor spray gun furnace mouth of the alkali recovery furnace in a push-pull or rotating installation manner, and can be closed or opened, and are used for sound insulation and noise reduction when closed; in this embodiment, the hinged rotation installation method is taken as an example, and the hinged part is set at the edge of the cabinet side panel, and is installed on the wall outside the furnace mouth using a hinge buckle component; the left soundproof door 1 and the right soundproof door 2 are symmetrically arranged, forming a cabinet-like structure, and are provided with avoidance notches for avoiding the black liquor spray gun pipe 4 and the air supply pipe 32 on the door body; when closed, they have a box-like appearance, and when opened, they can be opened to both sides to expose the furnace mouth area for convenient observation and operation;

[0040] The air sealing device 3 includes an air curtain nozzle 31 and an air supply pipe 32. The outer end of the air supply pipe 32 is connected to an external air source, and the inner end is connected to the air curtain nozzle 31. The air curtain nozzle 31 is arranged at the furnace mouth and continuously sprays an air curtain into the furnace; the purpose is to form an air curtain at the furnace mouth. An external air source such as a compressed air system is connected to the air curtain nozzle 31 to provide a continuous airflow. The air curtain can also prevent pollutants such as dust and smoke from escaping from the furnace, keeping the furnace mouth environment clean. The air curtain can also isolate the high temperature overflow from the furnace to a certain extent;

[0041] The black liquor spray gun pipe 4 extends from the outside of the furnace mouth to the inside of the furnace mouth and is used to transport and spray black liquor, which is usually waste liquid generated during the papermaking process. The black liquor is evenly sprayed into the furnace body for combustion treatment to recover the chemical substances and energy therein;

[0042] The soundproof door body includes the cabinet door panel, cabinet top panel, and cabinet bottom panel. From the outside to the inside, the panel comprises: an outer panel 10, a bottom sound-absorbing padding layer 11, a middle sound-absorbing cotton layer, a top sound-absorbing padding layer 12, a frame 13, and a wire mesh 14. The frame 13 serves as the overall framework of the panel structure. The wire mesh 14 is bound to the frame 13 to form an inner shield. The space between the outer panel 10 and the wire mesh 14 is filled with the bottom sound-absorbing padding layer 11, the middle sound-absorbing cotton layer, and the top sound-absorbing padding layer 12. The wire mesh 14 and the frame 13 provide the overall framework and strength of the panel and serve as an external support grid for the multi-layer sound insulation material, preventing displacement or deformation of the sound insulation material.

[0043] The middle layer of sound-absorbing cotton, from the outside to the inside, includes a second layer of sound-absorbing cotton 15 and a first layer of sound-absorbing cotton 16. The bottom and top layers of sound-absorbing padding 11 and 12 are made of sound-absorbing fiber material and serve to encase the second and first layers of sound-absorbing cotton 15 and 16. The first and second layers of sound-absorbing cotton 16 and 15 are a combination of rock wool or slag wool. The bottom and top layers of sound-absorbing padding 11 and 12 are made of silicate material. Rock wool is a fiber material made from molten rock and has excellent sound absorption properties. Slag wool is a fiber material made from molten slag and also has excellent sound absorption properties. Silicate material is an inorganic non-metallic material commonly used in construction and sound insulation, with excellent heat resistance and sound absorption properties. The combination of different materials enhances the overall sound absorption effect. The top and bottom layers of sound-absorbing padding protect and encase the middle layer of sound-absorbing cotton, while the two middle layers of sound-absorbing cotton provide the primary sound absorption. Different sound-absorbing materials have different absorption characteristics for different frequencies of sound. Rock wool and slag wool perform better in mid- and high-frequency bands, while silicate materials may perform better in low-frequency bands. Combining these materials can achieve effective absorption across the entire spectrum. When sound waves travel from one layer of material to another, they reflect and refract at the interfaces. This multiple reflection and scattering process increases the complexity of the sound wave's path, causing it to travel longer within the material, giving it more opportunities to be absorbed. Because different materials have different acoustic impedances, combining multiple layers of material can better match the impedance between air and the sound-absorbing material, reducing reflections and improving absorption efficiency. Sound waves experience more friction and energy loss when passing through thicker materials, resulting in more effective absorption. Low-frequency sounds, in particular, require a longer distance to fully dissipate their energy, so increasing the thickness can significantly improve low-frequency sound absorption. In this embodiment, to ensure ease of operation, the multi-layer sound insulation material is 100-120 mm thick. The outer layer 10 is an 8 mm thick steel or iron plate, providing external shaping and aesthetic protection. A handle 24 is installed on the outside of the cabinet door panel for easy operation, and a door lock can be installed if necessary.

[0044] Preferably, half a slot is provided on the edge of each of the left and right soundproof doors 1 and 2. When the left and right soundproof doors 2 are closed, the two half slots align and overlap to form a complete spray gun avoidance opening 20. The black liquor spray gun pipe 4 can pass through this avoidance opening. Half a slot is also provided on the edge of the cabinet top panel. When the left and right soundproof doors 2 are closed, the two half slots align and overlap to form a complete air supply pipe 32 avoidance opening 21. The air supply pipe 32 can pass through this avoidance opening. By providing half a slot on the edge of each door panel and top panel, when the doors are closed, these slots can be precisely aligned and overlapped to form a complete avoidance opening. This ensures that the spray gun and air supply pipe 32 can pass through smoothly while maintaining the sealing of the cabinet door. This design allows the spray gun and air supply pipe 32 to move in and out without changing the original layout, improving the flexibility and convenience of use while ensuring a good sound insulation effect. Preferably, the positions where the black liquor spray gun pipe 4 and the air supply pipe 32 enter the soundproof door body are exactly at the door gap of the soundproof door body.

[0045] Example 2: Based on Example 1, the half slots on the cabinet door panel and the cabinet top panel are both provided with cushioning components 22. After the cabinet door is closed, the cushioning components 22 can form contact with the black liquor spray gun or the air supply pipe 32, and are used to eliminate the gap between the pipe wall and the slot, thereby improving the sound insulation effect. This cushion is usually made of elastic material, such as rubber sound insulation cotton or sound insulation fiber material, and has good sealing and deformation capabilities. When the cabinet door is closed, the cushioning component 22 will be in close contact with the black liquor spray gun or the air supply pipe 32, filling the tiny gap between the pipe wall and the slot, and preventing sound from propagating through these gaps. The elastic material of the cushioning component 22 can absorb and reduce vibration, thereby further reducing noise transmission and improving the overall sound insulation effect.

[0046] The air supply pipe 32 is connected to two air curtain nozzles 31 via a three-way joint. The two air curtain nozzles 31 are placed on either side of the furnace opening. Each air curtain nozzle 31 is equipped with a number of air jets facing into the furnace. These two nozzles are installed on either side of the furnace opening to spray gas into the furnace, forming an air curtain. This two-way air curtain can better help control the atmosphere and temperature distribution within the furnace or prevent smoke and dust from escaping. In the preferred embodiment, the air jets on each air curtain nozzle 31 are staggered in height, forming a tighter air curtain overall, which provides a better protective effect.

[0047] A number of small hole channels 23 are provided on the cabinet door panel, cabinet top panel or cabinet bottom panel. The small hole channels 23 connect the inside and outside of the soundproof door body, and the shape of the small hole channels 23 is a tapered channel structure whose aperture gradually decreases from the outside to the inside. Since the cushion component 22 blocks the gap between the tube wall and the cabinet door, but since the air sealing device 3 generates high-speed airflow and forms negative pressure, there will be a certain amount of airflow movement, so it is necessary to consider leaving a gap for airflow in and out; the aperture of the small hole channel 23 varies, which maintains air permeability and is conducive to sound insulation. It can effectively absorb the noise transmitted through the door body and improve the sound insulation effect. The diameter and cavity size need to be precisely designed according to the specific application requirements to ensure the best sound absorption effect; the inner wall of the small hole channel 23 can be the material inside the cabinet door, or it can be a tapered tube made of other materials inserted.

[0048] It should be understood that the above-described specific embodiments of the present invention are merely illustrative of or explanation of the principles of the present invention and do not constitute limitations of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention shall be included within the scope of protection of the present invention. In addition, the appended claims of the present invention are intended to cover all variations and modifications that fall within the scope and metes and bounds of the appended claims, or equivalents thereof.

Claims

1. A sound insulation and noise reduction device for the black liquor spray gun furnace mouth of an alkali recovery furnace, characterized in that include: The soundproof door body comprises a left soundproof door (1) and a right soundproof door (2), which are arranged outside the black liquor spray gun furnace port of the alkali recovery furnace in a push-pull or rotational installation manner, can be closed or opened, and is used for sound insulation and noise reduction after closing; The air sealing device (3) comprises an air curtain nozzle (31) and an air supply pipe (32), wherein the outer end of the air supply pipe (32) is connected to an external air source, and the inner end is connected to the air curtain nozzle (31), and the air curtain nozzle (31) is arranged at the furnace mouth and continuously sprays an air curtain toward the furnace; The black liquor spray gun pipe (4) is extended from the outside of the furnace mouth to the inside of the furnace mouth and is used to spray black liquor into the furnace body. The left soundproof door (1) and the right soundproof door (2) are symmetrically arranged and have a cabinet-like structure. Avoidance slots for avoiding the black liquor spray gun pipe (4) and the air supply pipe (32) are provided on the door bodies. The door bodies of the left soundproof door (1) and the right soundproof door (2) are made of a multi-layer sound insulation material.

2. The sound insulation and noise reduction device according to claim 1, characterized in that The soundproof door body comprises a cabinet door panel, a cabinet top panel and a cabinet bottom panel, wherein the panel comprises, from the outside to the inside, an outer panel (10), a bottom sound-absorbing pad (11), a middle sound-absorbing cotton layer, a top sound-absorbing pad (12), a frame (13) and a wire mesh (14); the frame (13) serves as the overall framework of the panel structure, the wire mesh (14) is bound to the frame (13) to form an inner layer shielding, and the space between the outer panel (10) and the wire mesh (14) is used to fill the bottom sound-absorbing pad (11), the middle sound-absorbing cotton layer and the top sound-absorbing pad (12).

3. The sound insulation and noise reduction device according to claim 2, characterized in that The middle layer of sound-absorbing cotton comprises, from the outside to the inside, a second layer of sound-absorbing cotton (15) and a first layer of sound-absorbing cotton (16); the bottom layer of sound-absorbing pad (11) and the top layer of sound-absorbing pad (12) are made of sound-absorbing fiber material and are used to wrap the second layer of sound-absorbing cotton (15) and the first layer of sound-absorbing cotton (16).

4. The sound insulation and noise reduction device according to any one of claims 2 and 3, characterized in that The avoidance notch comprises a half slot provided on the edge of the cabinet door panel; when the left soundproof door (1) and the right soundproof door (2) are closed, the two slots can be aligned and overlapped on the cabinet door to form a spray gun avoidance opening (20); the black liquor spray gun pipe (4) can pass through the spray gun avoidance opening (20); A half slot is also provided on the edge of the cabinet top plate. When the left soundproof door (1) and the right soundproof door (2) are closed, the two slots can be aligned and overlapped on the cabinet top plate to form an air supply pipe (32) avoidance opening (21); the air supply pipe (32) can pass through the air supply pipe (32) avoidance opening (21).

5. The sound insulation and noise reduction device according to claim 4, characterized in that The half slots on the cabinet door panel and the cabinet top panel are both provided with cushion components (22). After the cabinet door is closed, the cushion components (22) can form contact with the black liquor spray gun or the air supply pipe (32), so as to eliminate the gap between the pipe wall and the slot and improve the sound-absorbing effect.

6. The sound insulation and noise reduction device according to claim 3, characterized in that The first layer of sound-absorbing cotton (16) and the second layer of sound-absorbing cotton (15) are made of rock wool or slag wool; the bottom sound-absorbing pad layer (11) and the top sound-absorbing pad layer (12) are made of silicate material.

7. The sound insulation and noise reduction device according to claim 1, characterized in that The positions where the black liquor spray gun pipe (4) and the air supply pipe (32) enter the sound insulation door body are exactly located at the door gap of the sound insulation door body.

8. The sound insulation and noise reduction device according to claim 1, characterized in that The air supply pipe (32) is connected to two air curtain nozzles (31) through a three-way joint. The two air curtain nozzles (31) are respectively placed on both sides of the furnace mouth. The air curtain nozzles (31) are each provided with a plurality of air jets facing the furnace.

9. The sound insulation and noise reduction device according to claim 5, characterized in that A plurality of small hole channels (23) are provided on the cabinet door panel, cabinet top panel or cabinet bottom panel, wherein the small hole channels (23) communicate with the inside and outside of the sound insulation door body, and the shape of the small hole channels (23) is a tapered channel structure in which the aperture gradually decreases from the outside to the inside.

10. The sound insulation and noise reduction device according to claim 2, characterized in that The outer layer plate (10) is a steel plate or iron plate with a thickness of 8 mm, the thickness of the multi-layer sound insulation material is 100-120 mm, and a handle (24) is installed on the outer side of the cabinet door plate.

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