Automatic deslagging mechanism for positive pressure reverse gasification furnace

Abstract

The application relates to an automatic deslagging mechanism for a positive pressure reverse gasification furnace, and belongs to the technical field of gasification furnace maintenance parts. The automatic deslagging mechanism for the positive pressure reverse gasification furnace comprises a material guiding mechanism, the material guiding mechanism comprises a material collecting hopper, an electric deslagging valve is flange-connected to the bottom of the material collecting hopper, a protective cover is flange-connected to the bottom of the electric deslagging valve, and a through opening is formed in the side end of the protective cover; the protective cover of the material guiding mechanism cooperates with a collecting box to form a closed deslagging space, a circulating mechanism extracts dust-containing gas through a centrifugal fan and filters the dust-containing gas in stages, clean airflow is sent into a gas guiding channel of an auxiliary deslagging mechanism through an air pipe, and a downward circulating air curtain is formed at the electric deslagging valve; the air curtain restrains dust caused by the falling of high-temperature furnace slag and guides the dust into the collecting box along with the slag flow, prevents the dust from diffusing to the surrounding space, does not need to wait for the dust to naturally settle after deslagging, shortens the time consumption of single deslagging, improves the deslagging efficiency, and improves the working environment.

Description

Technical Field

[0001] This invention relates to the field of gasifier maintenance components, and in particular to an automatic slag removal mechanism for a positive-pressure reverse gasifier. Background Technology

[0002] Common bottom slag discharge systems employ a gravity-feed structure, with a valve at the slag outlet and a collection container or conveyor below. During slag discharge, the valve is opened, and the slag falls directly into the container and is then removed or transported away by a conveyor belt. This structure is simple, straightforward to operate, requires no sealing medium, facilitates continuous slag discharge, and has low equipment investment and maintenance costs, making it widely used in small- to medium-scale thermochemical treatment systems.

[0003] However, in this gravity-feeding method, the high-temperature slag falls and impacts the bottom of the container at the moment the valve is opened, stirring up dust that disperses into the surrounding space. This dust phenomenon not only worsens the operating environment, but also requires waiting for the dust to settle naturally after slag discharge before subsequent operations can proceed, increasing the time required for each slag discharge and hindering the improvement of slag discharge efficiency. Summary of the Invention

[0004] Therefore, it is necessary to provide an automatic slag removal mechanism for a positive pressure reverse gasifier to address the problem that when the valve for gravity-feed slag discharge is opened, the falling slag stirs up dust, requiring settling and waiting before continued discharge, which pollutes the environment and prolongs the process.

[0005] An automatic ash removal mechanism for a positive-pressure reverse gasifier includes: The material guiding mechanism includes a hopper, an electric slag discharge valve connected to the bottom flange of the hopper, a protective cover connected to the bottom flange of the electric slag discharge valve, an opening on the side of the protective cover, an automatic guide trolley placed inside the protective cover, a collection box covering the discharge port of the protective cover installed on the top of the automatic guide trolley, a connection port communicating with the opening on the side of the collection box, and a high-temperature resistant filter screen detachably connected inside the connection port; An auxiliary slag discharge mechanism includes a support frame, which is fixedly connected to the vertical inner wall of the hopper. An air guide channel is provided on the lower surface of the support frame, with its outlet facing an electric slag discharge valve. An installation cavity is provided inside the support frame, and a vertical shaft is rotatably connected inside the installation cavity. A scraper that contacts the bottom wall of the hopper is fixedly connected to the arc surface of the vertical shaft. A driven bevel gear is fixedly connected to the top of the vertical shaft, and a driving bevel gear meshes with the surface of the driven bevel gear. A horizontal shaft, rotatably connected to the installation cavity, is fixedly connected to the end of the driving bevel gear facing away from the driven bevel gear. A motor is fixedly connected to the end of the horizontal shaft facing away from the driven bevel gear. The circulation mechanism includes a centrifugal fan. The inlet flange of the centrifugal fan is connected to the side of the port facing away from the high-temperature resistant filter screen. The outlet of the centrifugal fan is detachably connected to an air pipe. The outlet of the air pipe passes through the collection hopper and is fixedly connected to the air guide channel.

[0006] In one embodiment, the support frame is cross-shaped, and the corners of the support frame are rounded.

[0007] In one embodiment, the local vertical cross-sectional shape of the contact area between the hopper and the scraper is an inverted cone, and the lowest point of the scraper does not contact the inner bottom wall of the hopper.

[0008] In one embodiment, the number of scrapers is not less than three, and the scrapers are arranged in a ring around the center line of the vertical axis.

[0009] In one embodiment, a diagonal brace is fixedly connected between the vertical shaft and the scraper, and the axis of the diagonal brace intersects perpendicularly at the contact surface between the hopper and the scraper.

[0010] In one embodiment, the number of the diagonal braces is two, and the two diagonal braces are symmetrically distributed on both sides of the center point of the scraper.

[0011] In one embodiment, a high-temperature resistant sealing ring is embedded in the inner side of the lower opening of the mounting cavity, and the high-temperature resistant sealing ring is sleeved on the arc surface of the vertical shaft.

[0012] In one embodiment, there are three air channels and three air tubes, and the air outlet of the air channel is elongated.

[0013] In one embodiment, two adjacent air channels are distributed at a 90-degree angle around the centerline of the hopper, and two adjacent air pipes are staggered.

[0014] In one embodiment, a ceramic filter is flanged between the port and the centrifugal fan, and the ceramic filter is disposed on the side of the high-temperature resistant filter screen facing the centrifugal fan.

[0015] 1. The above-mentioned automatic slag removal mechanism for positive pressure reverse gasification furnace has a protective cover for the material guiding mechanism that works with the collection box to form a closed slag discharge space. The circulation mechanism uses a centrifugal fan to extract dust-laden gas and filter it step by step. The clean airflow is sent into the air guiding channel of the auxiliary slag discharge mechanism through the air pipe, forming a downward circulating air curtain at the electric slag discharge valve. This air curtain suppresses the dust agitated by the falling high-temperature slag and guides it into the collection box with the slag flow, preventing the dust from spreading into the surrounding space. After slag discharge, there is no need to wait for the dust to settle naturally, shortening the time for a single slag discharge, improving slag discharge efficiency, and improving the working environment. 2. The motor-driven vertical shaft of the auxiliary slag discharge mechanism drives multiple scrapers to scrape the circumferential area along the inverted conical inner bottom wall of the hopper, forcibly pushing the residual slag towards the slag discharge port to prevent slag adhesion and bridging, ensuring smooth slag discharge; the clean airflow blown downward through the air guide channel by the circulation mechanism acts on the scraping area of ​​the scrapers, suppressing the dust agitated by slag scraping and guiding it to the slag discharge port to avoid secondary dust generation; the long strip-shaped air outlets of the air guide channel are evenly distributed around the circumference of the hopper, and the airflow covers the scraping area, with slag scraping and dust suppression working together to improve the cleanliness and reliability of slag discharge. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the automatic slag removal mechanism in the positive pressure reverse gasifier of the present invention. Figure 2 This is a schematic diagram of the automatic slag removal mechanism in this invention; Figure 3 for Figure 2 Schematic diagram of the cross section at point AA; Figure 4 for Figure 2 Schematic diagram of the cross section at point BB; Figure 5 for Figure 4 Enlarged view of point A in the middle; Figure 6 This is a partial structural schematic diagram of the auxiliary slag discharge mechanism in this invention; Figure 7 This is a schematic diagram of the connection between the support frame and the air pipe in this invention.

[0018] Figure label: 100. Material guiding mechanism; 110. Collection hopper; 120. Electric slag discharge valve; 130. Protective cover; 131. Through port; 140. Automatic guide vehicle; 150. Collection box; 151. Connection port; 160. High-temperature resistant filter screen; 200. Auxiliary slag discharge mechanism; 210. Support frame; 211. Air guide channel; 212. Mounting cavity; 220. Vertical shaft; 230. Scraper; 240. Driven bevel gear; 250. Driven bevel gear; 260. Horizontal shaft; 270. Motor; 280. Diagonal brace; 290. High-temperature resistant sealing ring; 300. Circulation mechanism; 310. Centrifugal fan; 320. Air pipe; 330. Ceramic filter. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this specification are for illustrative purposes only and do not represent the only possible implementation.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0024] The following is combined Figures 1-7 The present invention describes an automatic slag removal mechanism for a positive-pressure reverse gasifier.

[0025] In one embodiment, an automatic slag removal mechanism for a positive-pressure reverse gasifier includes: a feeding mechanism 100, an auxiliary slag discharge mechanism 200, and a circulation mechanism 300.

[0026] like Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the material guiding mechanism 100 includes a collecting hopper 110. During the production process of the positive-pressure reverse gasification furnace, the collecting hopper 110 needs to be welded around the slag discharge point of the furnace in a sealed manner. The bottom flange of the collecting hopper 110 is connected to an electric slag discharge valve 120, which can automatically open and close the slag discharge, reducing manual operation. The bottom flange of the electric slag discharge valve 120 is connected to a protective cover 130, which cooperates with the collecting box 150 to form a closed slag discharge space to prevent dust from escaping. The side end of the protective cover 130 has an opening 131 for dust-laden gas. An orderly discharge channel is provided. An automatic guide vehicle 140 is placed inside the protective cover 130 for automatic connection and transfer of the collection box 150. The top of the automatic guide vehicle 140 is equipped with a collection box 150 that is directly below the discharge port of the protective cover 130 to receive slag and close the discharge port. The side end of the collection box 150 is provided with a connection port 151 that communicates with the through port 131 to form an airflow circulation path. A high-temperature resistant filter screen 160 is detachably connected inside the connection port 151 to intercept large particles of slag and facilitate cleaning. like Figures 2-7 As shown, the auxiliary slag discharge mechanism 200 includes a support frame 210, which is fixedly connected to the inner wall of the lower conical section of the collection hopper 110 to provide stable support for the scraper 230. An air guide channel 211 is provided on the lower surface of the support frame 210 for introducing clean airflow. The air outlet of the air guide channel 211 is located above and facing the electric slag discharge valve 120, so that the downward airflow forms a downward air curtain at the slag discharge port, sweeping away dust and suppressing dust emission. An installation cavity 212 is provided inside the support frame 210 to accommodate the transmission components. A vertical shaft 220 is rotatably connected inside the installation cavity 212. The scraper 230 is used to drive the scraper 230 to rotate. The arc surface of the vertical shaft 220 is fixedly connected to the scraper 230, which has a predetermined gap between the scraping edge and the inner bottom wall of the hopper 110, so as to scrape the residual slag on the bottom wall and prevent adhesion and bridging. The top of the vertical shaft 220 is fixedly connected to the driven bevel gear 240. The surface of the driven bevel gear 240 is meshed with the driving bevel gear 250. The end of the driving bevel gear 250 facing away from the driven bevel gear 240 is fixedly connected to the horizontal shaft 260 which is rotatably connected to the mounting cavity 212. The end of the horizontal shaft 260 facing away from the driven bevel gear 240 is fixedly connected to the motor 270, which provides driving force for the rotation of the scraper 230. The support frame 210 is cross-shaped to reduce obstruction of slag falling. The corners of the support frame 210 are rounded to prevent slag accumulation at the edges. The local vertical cross-section of the contact area between the collecting hopper 110 and the scraper 230 is inverted conical to guide the slag towards the discharge port. A predetermined gap is maintained between the scraping edge of the scraper 230 and the inner bottom wall of the collecting hopper 110 to achieve non-contact scraping. There are at least three scrapers 230, arranged in a ring around the axis 220, allowing for comprehensive circumferential scraping of the collecting hopper 110. The vertical axis 220 and the scraper 230... A diagonal brace 280 is fixedly connected between the vertical shaft 220 and the scraper 230. The two ends of the diagonal brace 280 are fixedly connected to the vertical shaft 220 and the scraper 230, respectively. The axis of the diagonal brace 280 is set at an angle to the scraping surface of the scraper 230 to enhance the structural rigidity of the scraper 230. There are two diagonal braces 280, which are symmetrically distributed on both sides of the center point of the scraper 230 to provide balanced support and improve operational stability. A high-temperature resistant sealing ring 290 is embedded in the inner side of the lower opening of the mounting cavity 212. The high-temperature resistant sealing ring 290 is sleeved on the arc surface of the vertical shaft 220 to prevent dust from entering the mounting cavity 212 and protect the transmission components.

[0027] like Figure 2 , Figure 3 , Figure 4 , Figure 6 and Figure 7 As shown, the circulation mechanism 300 includes a centrifugal fan 310. The inlet flange of the centrifugal fan 310 is connected to the side of the port 131 facing away from the high-temperature resistant filter screen 160. The outlet of the centrifugal fan 310 is detachably connected to an air pipe 320. The outlet of the air pipe 320 passes through the collection hopper 110 and is fixedly connected to the air guide channel 211 to form a closed circulation loop, using clean airflow to assist in slag discharge and suppress dust. There are three air guide channels 211 and three air pipes 320, which can form a multi-point air curtain. The outlet of the air guide channel 211 is elongated. It facilitates the formation of a flat airflow curtain, enhancing the dust blocking effect; two adjacent air guide channels 211 are distributed at a 90-degree angle around the axis of the collection hopper 110, and two adjacent air pipes 320 are staggered, so that the airflow is evenly distributed around the collection hopper 110, avoiding airflow dead zones; along the airflow path, a ceramic filter 330 is flanged between the inlet 131 and the air inlet end of the centrifugal fan 310, and the ceramic filter 330 is located on the side of the high-temperature resistant filter screen 160 facing the centrifugal fan 310, so as to remove fine dust and protect the centrifugal fan 310.

[0028] In this embodiment, during the slag discharge operation, the automatic guide vehicle 140 of the material guiding mechanism 100 automatically travels to directly below the protective cover 130 according to the control system command, so that the collection box 150 mounted on its top is accurately received directly below the discharge port of the protective cover 130; at this time, the connection port 151 on the side of the collection box 150 is aligned and connected with the through port 131 on the side of the protective cover 130 to form a closed slag discharge channel. Subsequently, the electric slag discharge valve 120 of the material guiding mechanism 100 is automatically opened, and the high-temperature slag accumulated in the collection hopper 110 falls into the collection box 150 under the action of gravity. At the same time as the electric slag discharge valve 120 is opened, the motor 270 of the auxiliary slag discharge mechanism 200 starts to run. The motor 270 drives the horizontal shaft 260 to rotate, and the horizontal shaft 260 drives the active bevel gear 250 to rotate synchronously. The active bevel gear 250 meshes and drives the driven bevel gear 240 to rotate. The driven bevel gear 240 drives the vertical shaft 220 and the multiple scrapers 230 arranged in a ring on it to rotate synchronously. The scrapers 230 scrape along the inverted conical inner bottom wall of the collecting hopper 110 with a non-contact gap, forcibly pushing the residual slag towards the slag discharge port to prevent the high-temperature slag from sticking and bridging. When the slag discharge volume reaches the set value or the slag in the collection hopper 110 is completely discharged, the electric slag discharge valve 120 automatically closes, and the centrifugal fan 310 and motor 270 stop after a delay. During the delay, the centrifugal fan 310 draws in residual dust-laden gas from the enclosed space formed by the protective cover 130 and the collection box 150. The filtered clean airflow is blown through the air pipe 320 and the air guide channel 211 onto the upper surface of the closed electric slag discharge valve 120 to sweep away the remaining dust and complete the purification. Subsequently, the automatic guide vehicle 140 carries the fully loaded collection box 150 away from under the protective cover 130 and transports it to the designated location. Thus, a fully enclosed, dust-free automatic slag removal cycle is completed. The entire process requires no manual intervention and does not require waiting for the dust to settle naturally, thereby improving slag discharge efficiency and improving the working environment.

[0029] Working principle: During the slag discharge process, the centrifugal fan 310 draws air from the side of the inlet 131 away from the high-temperature resistant filter 160. The dust-laden gas first passes through the high-temperature resistant filter 160 inside the connection port 151, where large particles of slag raised by the airflow are intercepted. Then, it passes through the ceramic filter 330 to remove fine dust. The filtered clean airflow is then forced into the air pipe 320 from the outlet of the centrifugal fan 310, and then sent through the air pipe 320 into the air guide channel 211 opened inside the support frame 210 of the auxiliary slag discharge mechanism 200. The outlet of the air guide channel 211 is elongated and faces downwards. A clean airflow is continuously blown downwards into the hopper 110 via the electric slag discharge valve 120. This downward airflow forms an air curtain in the slag discharge port area, sweeping away the dust adhering to the valve body and hopper wall, and blocking the dust from escaping outwards. At the same time, the downward airflow acts directly above the scraping area of ​​the scraper 230, suppressing the dust agitated during the scraping process of the scraper 230, restraining the dust and guiding it towards the slag discharge port, so that it enters the collection box 150 along with the main slag flow, thereby preventing secondary dust from being generated inside the hopper 110 due to the disturbance of the scraper 230.

[0030] It should be noted that, in the above description, the actual product model of electric slag discharge valve 120 is Jucheng Valve's PZ973W-10NR electric high-temperature slag discharge valve; the actual product model of automatic guided vehicle 140 is Heli's CPD10SQ-AGV1A1LI 1-ton omnidirectional counterbalanced laser-guided AGV; the actual product model of high-temperature resistant filter 160 is Wonifeng's THSBA-172RDN-40 high-temperature resistant high-efficiency filter; the actual product model of motor 270 is Wannan Motor's YE4VF-280M-4B3 variable frequency motor; the actual product model of centrifugal fan 310 is Tianhong Fan's 9-19 / 26 high-pressure industrial dust removal explosion-proof centrifugal fan; and the actual product model of ceramic filter 330 is Zhejiang Jinkun Zirconium Industry's JK-Z high-temperature zirconia foam ceramic filter.

[0031] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0032] The above-described embodiments are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. An automatic ash removal mechanism for a positive-pressure reverse gasification furnace, characterized in that, include: The material guiding mechanism (100) includes a material collecting hopper (110), an electric slag discharge valve (120) connected to the bottom flange of the material collecting hopper (110), a protective cover (130) connected to the bottom flange of the electric slag discharge valve (120), a through-hole (131) opened on the side end of the protective cover (130), an automatic guide trolley (140) placed inside the protective cover (130), a collection box (150) covering the discharge port of the protective cover (130) installed on the top of the automatic guide trolley (140), a connection port (151) communicating with the through-hole (131) opened on the side end of the collection box (150), and a high-temperature resistant filter screen (160) detachably connected inside the connection port (151). An auxiliary slag discharge mechanism (200) includes a support frame (210), which is fixedly connected to the vertical inner wall of the hopper (110). An air guide channel (211) is provided on the lower surface of the support frame (210), with its outlet facing the electric slag discharge valve (120). An installation cavity (212) is provided inside the support frame (210), and a vertical shaft (220) is rotatably connected inside the installation cavity (212). A scraper (230) is fixedly connected to the arc surface and contacts the bottom wall of the hopper (110). A driven bevel gear (240) is fixedly connected to the top of the vertical shaft (220). A driving bevel gear (250) is meshed with the surface of the driven bevel gear (240). A horizontal shaft (260) that is rotatably connected to the mounting cavity (212) is fixedly connected to the end of the driving bevel gear (250) facing away from the driven bevel gear (240). A motor (270) is fixedly connected to the end of the horizontal shaft (260) facing away from the driven bevel gear (240). The circulation mechanism (300) includes a centrifugal fan (310), the inlet flange of the centrifugal fan (310) is connected to the side of the port (131) facing away from the high temperature filter screen (160), and the outlet end of the centrifugal fan (310) is detachably connected to an air pipe (320), the outlet end of the air pipe (320) passes through the collection hopper (110) and is fixedly connected to the air guide channel (211).

2. The automatic slag removal mechanism for a positive-pressure reverse gasifier according to claim 1, characterized in that, The support frame (210) is shaped like a cross, and the corners of the support frame (210) are rounded.

3. The automatic slag removal mechanism for a positive-pressure reverse gasifier according to claim 1, characterized in that, The local vertical cross-sectional shape of the contact area between the hopper (110) and the scraper (230) is an inverted cone shape, and the lowest point of the scraper (230) does not contact the inner bottom wall of the hopper (110).

4. The automatic slag removal mechanism for a positive-pressure reverse gasifier according to claim 3, characterized in that, The number of scrapers (230) is not less than three, and the scrapers (230) are distributed in a ring around the axis of the vertical axis (220).

5. The automatic slag removal mechanism for a positive-pressure reverse gasifier according to claim 1, characterized in that, A diagonal brace (280) is fixedly connected between the vertical shaft (220) and the scraper (230), and the axis of the diagonal brace (280) intersects perpendicularly at the contact surface between the hopper (110) and the scraper (230).

6. The automatic slag removal mechanism for a positive-pressure reverse gasifier according to claim 5, characterized in that, The number of the diagonal braces (280) is two, and the two diagonal braces (280) are symmetrically distributed on both sides of the center point of the scraper (230).

7. The automatic slag removal mechanism for a positive-pressure reverse gasifier according to claim 1, characterized in that, A high-temperature resistant sealing ring (290) is embedded in the inner side of the lower opening of the mounting cavity (212), and the high-temperature resistant sealing ring (290) is sleeved on the arc surface of the vertical shaft (220).

8. The automatic slag removal mechanism for a positive-pressure reverse gasifier according to claim 1, characterized in that, The number of air guide channels (211) and air pipes (320) are both three, and the air outlet of the air guide channel (211) is elongated.

9. The automatic slag removal mechanism for a positive-pressure reverse gasifier according to claim 8, characterized in that, The two adjacent air channels (211) are distributed at a 90-degree angle around the axis of the collection hopper (110), and the two adjacent air pipes (320) are staggered.

10. The automatic slag removal mechanism for a positive-pressure reverse gasifier according to claim 1, characterized in that, A ceramic filter (330) is flange-connected between the port (131) and the centrifugal fan (310). The ceramic filter (330) is located on the side of the high-temperature filter screen (160) facing the centrifugal fan (310).

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