A recovery device for conveying gas in a circulating conveying system

Abstract

A kind of recycling device for conveying gas in circulating conveying system belongs to pneumatic conveying system field, for solving the problem of conveying capacity decline caused by rotary valve leakage, including: buffer hopper, tail gas recovery hopper, first discharging component, second discharging component, powder bin, first gas recovery pipeline, second gas recovery pipeline and discharge pipeline, buffer hopper obtains upstream dry qualified powder by feeding pipeline, the output end of buffer hopper is connected with the input end of at least two first discharging components by pipeline respectively, the output end of tail gas recovery hopper is connected with the input end of at least one second discharging component by pipeline respectively, first discharging component is connected with the input end of buffer hopper and tail gas recovery hopper by first gas recovery pipeline, second discharging component is connected with the input end of tail gas recovery hopper by second gas recovery pipeline, the output end of first discharging component and second discharging component is connected with powder bin by discharge pipeline.

Description

Technical Field

[0001] This invention belongs to the field of pneumatic conveying systems, and specifically relates to a gas recovery device used in a circulating conveying system. Background Technology

[0002] Currently, most powder or fine powder products produced by processes such as polypropylene, polyethylene, polyvinyl chloride, polycarbonate, and metal mineral powder are conveyed using rotary valves. During conveying, these rotary valves suffer from significant leakage, causing gas to return to other areas or be discharged. Furthermore, with increasing wear over time, leakage increases, leading to increased "air replenishment" and higher energy consumption for the entire system. Internal air leakage causes pressure loss and energy dissipation, reducing conveying capacity and severely impacting the stability of the pneumatic conveying system. Moreover, the high requirements for rotary valve replacement hinder the use and development of domestically produced valves. These are common problems faced by circulating conveying systems. Solving these problems would bring significant economic and social benefits to both the equipment and customers. Summary of the Invention

[0003] The technical problem this invention aims to solve is insufficient "gas replenishment" during the conveying process, resulting in reduced conveying capacity and the need for domestically produced valves as substitutes. To address these issues, this invention provides a gas recovery device for use in a circulating conveying system.

[0004] The present invention adopts the following technical solution:

[0005] A gas recovery device for a circulating conveying system includes: a buffer hopper, a tail gas recovery hopper, a first feeding assembly, a second feeding assembly, a powder silo, a first gas recovery pipeline, a second gas recovery pipeline, and a discharge pipeline. The input end of the buffer hopper receives upstream dried and qualified powder through the feed pipeline. The output end of the buffer hopper is connected to the input ends of at least two first feeding assemblies through pipelines. The output end of the tail gas recovery hopper is connected to the input end of at least one second feeding assembly through pipelines. The first feeding assembly recovers leaked gas from the first feeding assembly by connecting to the input ends of the buffer hopper and the tail gas recovery hopper through the first gas recovery pipeline. The second feeding assembly recovers leaked gas from the second feeding assembly by connecting to the input end of the tail gas recovery hopper through the second gas recovery pipeline. The output ends of the first and second feeding assemblies are connected to the powder silo through the discharge pipeline to transport the material to the powder silo for packaging or additive replenishment.

[0006] Optionally, the recovery device further includes a powder-containing gas recovery assembly, which includes: a first bag filter, a second bag filter, a filter, a first cooler, a conveying fan, a second cooler, and a cryocooler. The first bag filter is connected to the exhaust gas recovery hopper, and the second bag filter is connected to the powder silo. The output ends of the first and second bag filters are connected to the input end of the filter through a powder-containing gas recovery pipeline. The filter, the first cooler, the conveying fan, the second cooler, and the cryocooler are sequentially connected through the powder-containing gas recovery pipeline. The output end of the cryocooler is connected to the discharge pipeline to transport the recovered powder to the powder silo.

[0007] Optionally, both the first and second feeding components include: a gas collecting chamber, a rotary valve, and a back-gas pipeline. The input end of the gas collecting chamber is connected to the output end of a buffer hopper or a tail gas recovery hopper via a pipeline to receive powder. The input end of the rotary valve is connected to the output end of the gas collecting chamber, and the output end of the rotary valve is connected to a powder silo via a discharge pipeline. One end of the back-gas pipeline is connected to the rotary valve near the output end of the gas collecting chamber, and the other end of the back-gas pipeline is connected to the gas collecting chamber to deliver high-pressure gas into the gas collecting chamber. Both the first and second gas recovery pipelines are connected to the gas collecting chamber to discharge gas.

[0008] Optionally, an expansion joint is provided at the connection between the inlet of the gas collecting chamber and the pipeline.

[0009] Optionally, an expansion joint and a shut-off valve are provided at the connection between the first gas recovery pipeline and the second gas recovery pipeline and the gas collection chamber.

[0010] Optionally, a baffle is provided at the connection between the reflux pipeline and the rotary valve.

[0011] Optionally, a flow aid is provided at the input end of the second feeding component.

[0012] Optionally, the input end of the exhaust gas recovery hopper is connected to upstream equipment via an upstream exhaust gas recovery pipeline to recover upstream exhaust gas.

[0013] Optionally, a butterfly valve and a check valve are installed on the discharge pipeline.

[0014] Optionally, control valves are provided at the output ends of both the buffer hopper and the exhaust gas recovery hopper.

[0015] The beneficial effects of this invention are that it is equipped with multiple feeding components, facilitating continuous operation and timely switching in case of malfunction, ensuring the smooth and uninterrupted operation of the conveying system. The rotary valve incorporates a first gas recovery pipeline and a second gas recovery pipeline to recover leaked gas. During normal operation, the flow is directed to the tail gas recovery device; when the tail gas recovery device requires maintenance, it can be temporarily switched back to the original system. Components entering the tail gas recovery hopper and powder silo, after being filtered by a bag filter, return the clean gas to the low-pressure end of the circulation system. After being recovered and reused by the powder-containing gas recovery component, the powder is returned to the system with high-pressure gas for recycling. This invention solves the problems of insufficient "replenishment gas," increased energy consumption, decreased conveying capacity, frequent rotary valve replacements, and reduced rotary valve lifespan caused by rotary valve wear, achieving stable production and significantly saving conveying gas, thus realizing energy conservation and consumption reduction. It effectively reduces the requirements for rotary valves, allowing domestically produced rotary valves to replace imported valves, reducing procurement costs and technical difficulties, eliminating reliance on imports, lowering investment costs, and ensuring conveying capacity, thereby promoting the rapid development of domestic valves. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the system architecture of the present invention;

[0017] Figure 2 This is a schematic diagram of the structure of the first feeding component and the second feeding component of the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0019] Example 1:

[0020] like Figure 1As shown, a gas recovery device for a circulating conveying system includes: a buffer hopper 1, a tail gas recovery hopper 2, a first feeding assembly 3, a second feeding assembly 4, a powder silo 5, a first gas recovery pipeline 6, a second gas recovery pipeline 7, and a discharge pipeline 8. The input end of the buffer hopper 1 receives upstream dried qualified powder through the feed pipeline 100. The output end of the buffer hopper 1 is connected to the input ends of at least two of the first feeding assemblies 3 through pipelines. The output end of the tail gas recovery hopper 2 is connected to the input ends of the first feeding assemblies 3 through pipelines. The first feeding component 3 is connected to the input end of the buffer hopper 1 and the tail gas recovery hopper 2 through the first gas recovery pipeline 6 to recover the leaked gas of the first feeding component 3. The second feeding component 4 is connected to the input end of the tail gas recovery hopper 2 through the second gas recovery pipeline 7 to recover the leaked gas of the second feeding component 4. The output ends of the first feeding component 3 and the second feeding component 4 are connected to the powder silo 5 through the discharge pipeline 8 to transport the material to the powder silo 5 for packaging or replenishment of additives.

[0021] like Figure 1 As shown, the first feeding assembly 3 is configured with at least two components, one of which serves as the primary feeding device and the others as backup feeding devices, facilitating continuous operation and timely switching in case of malfunction. The first gas recovery pipeline 6 and the second gas recovery pipeline 7 recover and reuse leaked gas, playing a certain role in gas replenishment.

[0022] like Figure 1 As shown, the recovery device further includes a powder-containing gas recovery assembly, which includes: a first bag filter 9, a second bag filter 10, a filter 11, a first cooler 12, a conveying fan 13, a second cooler 14, and a cryocooler 15. The first bag filter 9 is connected to the exhaust gas recovery hopper 2, and the second bag filter 10 is connected to the powder silo 5. The output ends of the first bag filter 9 and the second bag filter 10 are connected to the input end of the filter 11 through a powder-containing gas recovery pipeline 16. The filter 11, the first cooler 12, the conveying fan 13, the second cooler 14, and the cryocooler 15 are connected sequentially through the powder-containing gas recovery pipeline 16. The output end of the cryocooler 15 is connected to the discharge pipeline 8 to transport the recovered powder to the powder silo 5.

[0023] like Figure 1As shown, the powder-containing gas recovery assembly is used to purify and recycle the gas. The first bag filter 9 and the second bag filter 10 recover the powder-containing gas in the tail gas recovery hopper 2 and the powder silo 5, and then collect it in the low-pressure area of ​​the circulation system, i.e., the input end of the filter 11. After impurities are filtered out by the filter 11, the gas is initially cooled in the first cooler 12. The conveying fan 13 provides high-pressure airflow to pressurize and convey the powder in the powder recovery pipeline. After pressurization, the material will be compressed during the conveying process, which will increase the temperature and increase the viscosity of the material. After being cooled to the qualified temperature by the second cooler 14 and the deep cooler 15, the material is conveyed to the powder silo 5 through the discharge pipeline to complete the cycle.

[0024] like Figure 1 , 2 As shown, both the first feeding assembly 3 and the second feeding assembly 4 include: a gas collecting chamber 17, a rotary valve 18, and a back-gas pipeline 19. The input end of the gas collecting chamber 17 is connected to the output end of the buffer hopper 1 or the tail gas recovery hopper 2 via a pipeline to receive powder. The input end of the rotary valve 18 is connected to the output end of the gas collecting chamber 17, and the output end of the rotary valve 18 is connected to the powder hopper 5 via a discharge pipeline 8. One end of the back-gas pipeline 19 is connected to the rotary valve 18 near the output end of the gas collecting chamber 17, and the other end of the back-gas pipeline 19 is connected to the gas collecting chamber 17 to transport high-pressure gas into the gas collecting chamber 17. The first gas recovery pipeline 6 and the second gas recovery pipeline 7 are both connected to the gas collecting chamber 17 to discharge gas.

[0025] like Figure 1 As shown, an expansion joint 20 can be provided at the connection between the input end of the gas collection chamber 17 and the pipeline to compensate for the axial deformation of the pipe body during the material conveying process.

[0026] like Figure 1 As shown, an expansion joint 20 and a shut-off valve 21 may be provided at the connection between the first gas recovery pipeline 6 and the second gas recovery pipeline 7 and the gas collection chamber 17, for compensating for axial deformation of the pipe body during gas transportation and controlling the opening and closing of the gas recovery pipeline.

[0027] In other embodiments, in order to prevent the powder from directly entering the backgassing pipe 19 during the rotation of the rotary valve 18 and reducing the feeding efficiency, a baffle is provided at the connection between the backgassing pipe 19 and the rotary valve 18.

[0028] like Figure 1 As shown, in other embodiments, in order to make the feeding smoother, a flow aid 22 is provided at the input end of the second feeding component 4.

[0029] like Figure 1 As shown, the input end of the exhaust gas recovery hopper 2 can be connected to the upstream equipment through the upstream exhaust gas recovery pipeline 26 to recover upstream exhaust gas.

[0030] like Figure 1 As shown, the discharge pipe 8 is equipped with a butterfly valve 23 and a check valve 24, which allows the discharge pipe 8 to pass in only one direction and prevents material backflow.

[0031] like Figure 1 As shown, both the buffer hopper 1 and the tail gas recovery hopper 2 are equipped with control valves 25 at their output ends for adjusting the output of materials.

[0032] The beneficial effects of this invention are that it is equipped with multiple feeding components, facilitating continuous operation and timely switching in case of malfunction, ensuring the smooth and uninterrupted operation of the conveying system. The rotary valve incorporates a first gas recovery pipeline and a second gas recovery pipeline to recover leaked gas. During normal operation, the flow is directed to the tail gas recovery device; when the tail gas recovery device requires maintenance, it can be temporarily switched back to the original system. Components entering the tail gas recovery hopper and powder silo, after being filtered by a bag filter, return the clean gas to the low-pressure end of the circulation system. After being recovered and reused by the powder-containing gas recovery component, the powder is returned to the system with high-pressure gas for recycling. This invention solves the problems of insufficient "replenishment gas," increased energy consumption, decreased conveying capacity, frequent rotary valve replacements, and reduced rotary valve lifespan caused by rotary valve wear, achieving stable production and significantly saving conveying gas, thus realizing energy conservation and consumption reduction. It effectively reduces the requirements for rotary valves, allowing domestically produced rotary valves to replace imported valves, reducing procurement costs and technical difficulties, eliminating reliance on imports, lowering investment costs, and ensuring conveying capacity, thereby promoting the rapid development of domestic valves.

Claims

1. A gas recovery device for use in a circulating conveying system, characterized in that, include: The system comprises a buffer hopper (1), a tail gas recovery hopper (2), a first feeding assembly (3), a second feeding assembly (4), a powder silo (5), a first gas recovery pipeline (6), a second gas recovery pipeline (7), and a discharge pipeline (8). The input end of the buffer hopper (1) receives upstream dried qualified powder through the feed pipeline (100). The output end of the buffer hopper (1) is connected to the input ends of at least two first feeding assemblies (3) through pipelines. The output end of the tail gas recovery hopper (2) is connected to the input end of at least one second feeding assembly (4) through pipelines. The first feeding assembly (3) is connected to the input ends of the buffer hopper (1) and the tail gas recovery hopper (2) through the first gas recovery pipeline (6). The first feeding assembly (3) recovers leaked gas through a connection to the end of the first feeding assembly (3). The second feeding assembly (4) is connected to the input end of the tail gas recovery hopper (2) through a second gas recovery pipeline (7) to recover leaked gas from the second feeding assembly (4). The output ends of the first feeding assembly (3) and the second feeding assembly (4) are connected to the powder silo (5) through a discharge pipeline (8) to transport the material to the powder silo (5) for packaging or to replenish additives. The recovery device also includes a powder-containing gas recovery assembly, which includes: a first bag filter (9), a second bag filter (10), a filter (11), a first cooler (12), a conveying fan (13), a second cooler (14), and a deep cooler (15). The first bag filter (9) is connected to the exhaust gas recovery hopper (2), and the second bag filter (10) is connected to the powder silo (5). The output ends of the first bag filter (9) and the second bag filter (10) are connected to the input end of the filter (11) through the powder-containing gas recovery pipeline (16). The filter (11), the first cooler (12), the conveying fan (13), the second cooler (14), and the cryocooler (15) are connected sequentially through the powder-containing gas recovery pipeline (16). The output end of the cryocooler (15) is connected to the discharge pipeline (8) to transport the recovered powder to the powder silo (5). The first feeding assembly (3) and the second feeding assembly (4) both include: a gas collection chamber (17), a rotary valve (1), and a rotary valve (1). 8) and the back-gas pipeline (19), the input end of the gas collecting chamber (17) is connected to the output end of the buffer hopper (1) or the tail gas recovery hopper (2) through the pipeline to receive powder, the input end of the rotary valve (18) is connected to the output end of the gas collecting chamber (17), the output end of the rotary valve (18) is connected to the powder silo (5) through the discharge pipeline (8), one end of the back-gas pipeline (19) is connected to the rotary valve (18) near the output end of the gas collecting chamber (17), the other end of the back-gas pipeline (19) is connected to the gas collecting chamber (17) to transport high-pressure gas into the gas collecting chamber (17), the first gas recovery pipeline (6) and the second gas recovery pipeline (7) are both connected to the gas collecting chamber (17) to discharge the gas.

2. A gas recovery device for a circulating conveying system according to claim 1, characterized in that, An expansion joint (20) is provided at the connection between the inlet end of the gas collection chamber (17) and the pipeline.

3. A gas recovery device for a circulating conveying system according to claim 1, characterized in that, An expansion joint (20) and a shut-off valve (21) are provided at the connection between the first gas recovery pipeline (6) and the second gas recovery pipeline (7) and the gas collection chamber (17).

4. A gas recovery device for a circulating conveying system according to claim 1, characterized in that, A baffle is provided at the connection between the backflow pipe (19) and the rotary valve (18).

5. A gas recovery device for a circulating conveying system according to claim 1, characterized in that, A flow aid (22) is provided at the input end of the second feeding component (4).

6. A gas recovery device for a circulating conveying system according to claim 1, characterized in that, The input end of the exhaust gas recovery hopper (2) is connected to the upstream equipment through the upstream exhaust gas recovery pipeline (26) to recover upstream exhaust gas.

7. A gas recovery device for a circulating conveying system according to claim 1, characterized in that, The discharge pipeline (8) is equipped with a butterfly valve (23) and a check valve (24).

8. A gas recovery device for a circulating conveying system according to claim 1, characterized in that, Both the buffer hopper (1) and the exhaust gas recovery hopper (2) are equipped with control valves (25) at their output ends.

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