Biomass pyrolysis gas dedusting device

Abstract

The utility model discloses a kind of biomass pyrolysis gas dust removal devices, belong to energy development technical field, including settling chamber, settling chamber is provided with settling cavity, the both ends of settling cavity have flue gas passage, conveying device is provided in flue gas passage;The bottom of settling cavity is provided with dust conveying device, and the upper portion of settling cavity is provided with dust-catching grid plate;High-temperature flue gas interlayer is provided in the outer wall surface of settling chamber, and high-temperature flue gas interlayer is provided around settling cavity and flue gas passage.Can high-efficiency dust settlement, and prevent pipeline blockage, maintain pyrolysis gas high temperature to prevent tar precipitation, stable and reliable operation.

Description

Technical Field

[0001] This utility model belongs to the field of energy development technology, and specifically relates to a biomass pyrolysis gas dust removal device. Background Technology

[0002] The statements in this section are merely background information related to this utility model and do not necessarily constitute prior art.

[0003] When biomass pyrolysis technology is used for resource utilization, the pyrolysis gas produced carries a large amount of dust. This dust travels through pipelines to the next stage of the process along with the pyrolysis gas. If effective dust removal measures are not taken, the dust will settle and clog the pipelines, affecting the long-term stable operation of the pyrolysis equipment.

[0004] Biomass pyrolysis technology mainly includes processes such as crushing, drying, pyrolysis, incineration, and waste heat utilization. Typically, the crushing stage breaks the biomass into a powdery structure, facilitating thorough drying and pyrolysis in the subsequent drying and pyrolysis stages. However, this results in a significant amount of dust generated during the pyrolysis stage, which enters the incineration stage pipelines along with the pyrolysis gas. Dust settling causes pipeline blockage, severely impacting the long-term stable operation of the pyrolysis equipment. Dust removal from biomass pyrolysis gas and unblocking pyrolysis gas pipelines are pressing problems that need to be solved in the field of biomass pyrolysis.

[0005] Biomass pyrolysis gas has unique physicochemical properties that make conventional dust removal methods difficult to apply: First, the pyrolysis gas remains at a high temperature after production, falling within the range of conventional high-temperature flue gas, requiring high operating temperatures and stringent thermal stability; Second, the pyrolysis gas contains a high concentration of dust with extremely fine particle sizes, making it difficult to effectively remove using conventional separation methods; Third, the pyrolysis gas contains a large number of condensable volatile components, which rapidly condense and precipitate when the gas temperature drops below the critical condensation temperature, forming sticky tar-like substances.

[0006] Currently, the industry mostly uses conventional cyclone separation dust removal technology for pyrolysis gas dust removal. Cyclone dust removal process requires the addition of fan equipment to provide airflow power. However, in the high-temperature operating environment of pyrolysis gas, the core components of the fan are in a high-temperature service state for a long time, resulting in extremely high equipment wear, failure and downtime rates. At the same time, the airflow will experience a significant temperature drop when passing through the fan and dust removal equipment, directly triggering the rapid condensation and precipitation of condensable components in the pyrolysis gas. Tar and dust mix and adhere, further aggravating the pipeline blockage problem. Utility Model Content

[0007] To address the aforementioned problems, this utility model provides a biomass pyrolysis gas dust removal device that can efficiently settle dust, prevent pipe blockage, maintain high temperature of pyrolysis gas to prevent tar precipitation, and operate stably and reliably.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A biomass pyrolysis gas dust removal device includes a settling chamber, a settling cavity is provided inside the settling chamber, and flue gas channels are provided at both ends of the settling cavity. A conveying device is provided in the flue gas channels. A dust conveying device is provided at the bottom of the settling cavity, and a dust collection grid is provided at the top of the settling cavity. A high-temperature flue gas jacket is provided in the inner wall of the settling chamber, and the high-temperature flue gas jacket is arranged around the settling cavity and the flue gas channels.

[0009] As a further technical solution, the flue gas passage includes a first flue gas passage and a second flue gas passage, wherein a primary horizontal conveying and unblocking device is installed in the first flue gas passage and a secondary horizontal conveying and unblocking device is installed in the second flue gas passage.

[0010] As a further technical solution, one end of the first flue gas channel is a pyrolysis gas inlet, and the other end is connected to the settling chamber; one end of the second flue gas channel is a pyrolysis gas outlet, and the other end is connected to the settling chamber.

[0011] As a further technical solution, the primary horizontal conveying and unblocking device and the secondary horizontal conveying and unblocking device have the same structure. Both the primary horizontal conveying and unblocking device and the secondary horizontal conveying and unblocking device include a conveying shaft, a spiral conveying fin, a fin support rod and a motor. One end of the conveying shaft is connected to the output shaft of the motor, and the motor is located outside the first flue gas channel.

[0012] As a further technical solution, a spiral conveying fin is sleeved on the output shaft, and fin support rods are arranged alternately around the surface of the output shaft. One end of the fin support rod is connected to the output shaft, and the other end is connected to the spiral conveying fin.

[0013] As a further technical solution, a number of conveying vibration devices are arranged at intervals on the conveying shaft. The conveying vibration device is a chain, and one end of the chain is fixedly connected to the conveying shaft.

[0014] As a further technical solution, the inlet of the high-temperature flue gas jacket is located at one end of the first flue gas channel, and the outlet of the high-temperature flue gas jacket is located at the dust outlet at the bottom of the settling chamber.

[0015] As a further technical solution, an insulation layer is provided on the outside of the high-temperature flue gas interlayer.

[0016] As a further technical solution, the dust collection grid includes a first dust collection grid, one end of which is connected to the side wall of the settling chamber, and the first dust collection grid is inclined toward the direction of the first flue gas passage.

[0017] As a further technical solution, the dust collection grid also includes a second dust collection grid, one end of which is connected to the upper wall of the settling chamber, and the second dust collection grid is inclined toward the direction of the first flue gas channel.

[0018] Compared with the prior art, the advantages and positive effects of this utility model are: This invention uses a horizontal conveying and unblocking device to transport dust. When the dust-laden pyrolysis gas passes through the horizontal conveying and unblocking device, it initially pushes the accumulated dust in the pipeline and then enters the settling chamber. The dust collection grid intercepts and guides the flow, allowing the fine dust to fully collide and settle by gravity. The settled dust is promptly discharged and collected by the dust conveying device, achieving efficient dust removal and preventing dust from being conducted downstream with the airflow.

[0019] The high-temperature flue gas jacket surrounds the settling chamber and flue gas passage for continuous heating, and the outer insulation layer reduces heat loss, keeping the pyrolysis gas at a high temperature throughout the process and preventing the condensable components from releasing tar. At the same time, the horizontal conveying and unblocking device has its own vibration and spiral conveying functions to actively clean the dust accumulated in the pipe wall and passage, preventing dust and tar from mixing and sticking to block the pipe and ensuring the long-term smooth flow of the pipeline. Attached Figure Description

[0020] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0021] Figure 1 This is a structural diagram of the biomass pyrolysis gas dust removal device of this utility model; Figure 2 This is a structural diagram of the horizontal conveying and unblocking device of this utility model; In the diagram: 1. Primary horizontal conveying and unblocking device; 101. Conveying shaft; 102. Conveying vibrator device; 103. Spiral conveying fins; 104. Fin support rod; 2. High-temperature flue gas interlayer; 3. Settling chamber; 4. First dust collection grid; 5. Secondary horizontal conveying and unblocking device; 6. Dust conveying device; 7. Insulation layer; 8. Second dust collection grid; 9. First flue gas passage; 10. Sedimentation chamber; 11. Second flue gas passage. Detailed Implementation

[0022] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0023] Currently, the industry mostly uses conventional cyclone separation dust removal technology for pyrolysis gas dust removal. Cyclone dust removal process requires the addition of fan equipment to provide airflow power. However, in the high-temperature operating environment of pyrolysis gas, the core components of the fan are in a high-temperature service state for a long time, resulting in extremely high equipment wear, failure and downtime rates. At the same time, the airflow will experience a significant temperature drop when passing through the fan and dust removal equipment, directly triggering the rapid condensation and precipitation of condensable components in the pyrolysis gas. Tar and dust mix and adhere, further aggravating the pipeline blockage problem.

[0024] The present invention will now be described in detail with reference to the accompanying drawings. This embodiment discloses a biomass pyrolysis gas dust removal device, such as... Figure 1 As shown, it includes a settling chamber 3, a settling cavity 10 is provided inside the settling chamber 3, and flue gas channels are provided at both ends of the settling cavity 10. A conveying device is provided in the flue gas channel; a dust conveying device 6 is provided at the bottom of the settling cavity 10, and a dust collection grid is provided at the top of the settling cavity 10; a high-temperature flue gas interlayer 2 is provided in the inner wall of the settling chamber 3, and the high-temperature flue gas interlayer 2 is arranged around the settling cavity 10 and the flue gas channel.

[0025] Specifically, dust is transported through a horizontal conveying and unblocking device. When the dust-laden pyrolysis gas passes through the horizontal conveying and unblocking device, it initially pushes the accumulated dust in the pipeline and then enters the settling chamber 3. The dust collection grid intercepts and guides the flow, allowing the fine dust to fully collide and settle by gravity. The settled dust is promptly discharged and collected by the dust conveying device 6, achieving efficient dust removal and preventing dust from being conducted downstream with the airflow.

[0026] The high-temperature flue gas jacket 2 continuously heats the settling chamber 3 and flue gas passage, while the outer insulation layer 7 reduces heat loss, maintaining the pyrolysis gas at a high temperature throughout the process and preventing the condensable components from releasing tar. Simultaneously, the horizontal conveying and unblocking device, equipped with vibration and spiral conveying functions, actively cleans dust accumulated on the pipe walls and in the passage, preventing dust and tar from mixing and clogging the pipes, ensuring long-term unobstructed flow. The process utilizes only the pressure difference between the negative pressure of the downstream incineration process and the positive pressure of the pyrolysis process as power, resulting in a simple, reliable, and highly stable process.

[0027] More specifically, the overall length of the settling chamber 3 can be appropriately increased, which can effectively expand the pyrolysis gas flow cross section and extend the airflow residence time, so that the pyrolysis gas velocity can be reduced steadily, providing more time and space for dust settling, making it easier for fine dust to be captured and settled, improving the dust removal effect, and enabling the device to remain stable and efficient when handling pyrolysis gas with high dust content.

[0028] The high-temperature flue gas jacket 2 outside the settling chamber 3 adopts an adjustable temperature design, which can flexibly adjust the flue gas temperature inside the high-temperature flue gas jacket 2 according to the actual working conditions of the pyrolysis gas, so as to stably heat the pyrolysis gas inside the settling chamber 3, keep the internal ambient temperature in a suitable range, avoid the precipitation of condensable components due to temperature drop, prevent tar and dust from mixing and sticking together, and ensure the long-term stable operation of the device.

[0029] The flue gas passage includes a first flue gas passage 9 and a second flue gas passage 11. A primary horizontal conveying and unblocking device 1 is installed in the first flue gas passage 9, and a secondary horizontal conveying and unblocking device 5 is installed in the second flue gas passage 11.

[0030] Specifically, a primary horizontal conveying and unblocking device 1 is installed inside the first flue gas duct 9, and a secondary horizontal conveying and unblocking device 5 is installed inside the second flue gas duct 11. The two sets of ducts and conveying devices form a connected airflow conveying path. The primary horizontal conveying and unblocking device 1 is responsible for the initial unblocking and dust pushing of the pyrolysis gas entering the device, while the secondary horizontal conveying and unblocking device 5 is responsible for the final unblocking and residual dust cleaning of the pyrolysis gas after dust removal.

[0031] One end of the first flue gas passage 9 is the pyrolysis gas inlet, and the other end is connected to the settling chamber 10; one end of the second flue gas passage 11 is the pyrolysis gas outlet, and the other end is connected to the settling chamber 10.

[0032] Specifically, the first flue gas channel 9 has one end as a pyrolysis gas inlet, directly receiving the dust-laden pyrolysis gas generated by biomass pyrolysis, and the other end is stably connected to the settling chamber 10, so that the dust-laden pyrolysis gas can smoothly enter the settling chamber 10 to complete the dust removal treatment; the second flue gas channel 11 has one end connected to the settling chamber 10, receiving the clean pyrolysis gas after dust removal, and the other end as a pyrolysis gas outlet, transporting the treated gas to the next process stage.

[0033] like Figure 2 As shown, the primary horizontal conveying and unblocking device 1 and the secondary horizontal conveying and unblocking device 5 have the same structure. Both the primary horizontal conveying and unblocking device 1 and the secondary horizontal conveying and unblocking device 5 include a conveying shaft 101, a spiral conveying fin 103, a fin support rod 104, and a motor. One end of the conveying shaft 101 is connected to the output shaft of the motor, and the motor is located outside the first flue gas passage 9. The spiral conveying fin 103 is sleeved on the output shaft, and the fin support rod 104 is arranged alternately around the surface of the output shaft. One end of the fin support rod 104 is connected to the output shaft, and the other end is connected to the spiral conveying fin 103.

[0034] Specifically, the motor is installed outside the first flue gas passage 9 to avoid being affected by high-temperature airflow. One end of the conveyor shaft 101 is connected to the motor output shaft, and the motor provides stable power. The spiral conveyor fins 103 are sleeved on the output shaft, and the fin support rods 104 are arranged alternately around the surface of the output shaft, with both ends connected to the output shaft and the spiral conveyor fins 103 respectively, forming a stable support structure.

[0035] During operation, the motor drives the conveyor shaft 101 to rotate, causing the spiral conveyor fins 103 to rotate synchronously. The fin support rod 104 ensures that the spiral conveyor fins 103 do not deviate during rotation, maintaining a stable conveying state. This allows the spiral conveyor fins 103 to smoothly push the dust in the channel, preventing the fins from loosening and affecting the conveying efficiency. It continuously pushes the accumulated dust in the channel to the settling chamber 10, achieving self-clearing of the channel. The first flue gas channel 9 undertakes the functions of air intake and preliminary dredging, while the second flue gas channel 11 undertakes the functions of air outlet and final dredging. In use, the primary horizontal conveying and dredging device 1 and the secondary horizontal conveying and dredging device 5 transport the dust in the first flue gas channel 9 to the settling chamber 10.

[0036] More specifically, the pyrolysis gas generated by pyrolysis first enters the primary horizontal conveying and unblocking device 1, which has both conveying and vibrating functions. This device transports dust falling into the horizontal pipe, as well as dust falling through the vibrating unblocking device, to the settling chamber 3, keeping the pipe unobstructed.

[0037] The pyrolysis gas enters the settling chamber 3 through a primary horizontal conveying and unblocking device 1. The settling chamber 3 is composed of a square steel structure cavity. Dust collection grids are installed inside the settling chamber 3. A high-temperature flue gas jacket 2 is installed on the outer wall of the settling chamber 3, through which high-temperature flue gas above 500°C is introduced to heat the settling chamber 3. At the same time, thermal insulation measures are implemented on the outside of the settling chamber 3, with an insulation layer 7 installed to ensure that the temperature inside the settling chamber 3 is maintained at a stable level above 300°C.

[0038] The dust collection grid inside settling chamber 3 blocks most of the dust in the pyrolysis gas, causing the dust to settle to the bottom of settling chamber 3 under gravity. A dust conveying device 6 is installed at the bottom of settling chamber 3 to transport the settled dust out of settling chamber 3 and collect it. After passing through settling chamber 3, the pyrolysis gas continues to enter the secondary horizontal conveying and unblocking device 5, which has both conveying and vibrating functions. This device transports the dust that falls into the horizontal pipe and the dust that falls through the vibrating unblocking device into settling chamber 3, keeping the pipe unobstructed.

[0039] By setting the primary horizontal conveying and unblocking device 1 and the secondary horizontal conveying and unblocking device 5 in an inclined arrangement, the dust can be moved by gravity, so that the dust deposited and shaken off in the channel can be transported more smoothly to the settling chamber 10, avoiding the dust from lingering in the channel. Combined with the spiral conveying structure, the unblocking efficiency is further improved, and the dust conveying is more stable.

[0040] The spiral conveyor fins 103 adopt a full spiral fin form, which can increase the contact area with dust and form a continuous and uninterrupted pushing surface. This avoids dust backflow or accumulation caused by partial missing fins, improves dust conveying capacity, and allows the dust accumulated in the channel to be quickly sent into the settling chamber 10, ensuring continuous and efficient conveying.

[0041] Several conveying vibration devices 102 are arranged at intervals on the conveyor shaft 101. The conveying vibration device 102 is a chain, and one end of the chain is fixedly connected to the conveyor shaft 101.

[0042] Specifically, several conveying vibrating devices 102 are arranged at intervals on the conveying shafts 101 of the primary horizontal conveying and unblocking device 1 and the secondary horizontal conveying and unblocking device 5. The conveying vibrating devices 102 adopt a chain structure, with one end of the chain fixedly connected to the conveying shaft 101 and the other end remaining free.

[0043] During operation, the conveyor shaft 101 drives the chain to rotate synchronously. Under centrifugal force, the chain continuously swings and impacts the conveyor shaft 101, shaking off the dust adhering to the shaft. The shaken-off dust is then pushed into the settling chamber 10 by the spiral conveyor fins 103. The chain-type conveyor rapping device 102 requires no additional power; it achieves continuous rapping simply by rotating the conveyor shaft 101. This effectively cleans stubborn dust from the conveyor shaft 101, preventing dust adhesion and blockage, and improving the channel's unblocking effect.

[0044] The inlet of the high-temperature flue gas interlayer 2 is located at one end of the first flue gas channel 9, and the outlet of the high-temperature flue gas interlayer 2 is located at the dust outlet at the bottom of the settling chamber 10.

[0045] Specifically, the inlet of the high-temperature flue gas interlayer 2 is located at one end of the first flue gas channel 9, which can quickly introduce high-temperature flue gas and preheat and insulate the first flue gas channel 9 from the inlet end; the outlet of the high-temperature flue gas interlayer 2 is located at the dust outlet at the bottom of the settling chamber 10, so that the high-temperature flue gas flows through the first flue gas channel 9, the settling chamber 10 and the periphery of the second flue gas channel 11 along the entire interlayer.

[0046] After flowing in from the inlet, the high-temperature flue gas gradually flows along the interlayer, continuously transferring heat to the internal channels and settling chamber 10, and finally exits from the dust outlet, completing the heating cycle. The flow path of the high-temperature flue gas is aligned with the flow path of the pyrolysis gas, improving heat exchange efficiency, ensuring uniform and stable temperature within the channels and settling chamber 10, avoiding localized temperature drops that could lead to tar condensation, and providing a suitable high-temperature environment for dust removal operations.

[0047] A heat insulation layer 7 is installed on the outside of the high-temperature flue gas interlayer 2.

[0048] Specifically, an insulation layer 7 is installed on the outside of the high-temperature flue gas interlayer 2. The insulation layer 7 tightly wraps around the outer wall of the interlayer, blocking heat exchange between the high-temperature flue gas interlayer 2 and the external environment. When the high-temperature flue gas flows and provides heat within the high-temperature flue gas interlayer 2, the insulation layer 7 continuously reduces heat loss to the outside, maintains the high temperature state inside the interlayer, and ensures the heating effect on the settling chamber 10 and the flue gas passage.

[0049] The insulation layer 7 and the high-temperature flue gas interlayer 2 form a double-layer protective structure. The high-temperature flue gas interlayer 2 is responsible for active heating, while the insulation layer 7 is responsible for passive temperature locking, which avoids rapid heat loss of high-temperature flue gas, reduces the supply consumption of high-temperature flue gas, and keeps the internal temperature of the device above the critical temperature for tar condensation for a long time, preventing condensable components in the pyrolysis gas from being released and avoiding tar and dust mixing and sticking to block the channel.

[0050] The dust collection grid includes a first dust collection grid 4, one end of which is connected to the side wall of the settling chamber 10, and the first dust collection grid 4 is inclined toward the direction of the first flue gas passage 9.

[0051] Specifically, one end of the first dust-collecting grid 4 is fixed to the side wall of the settling chamber 10, and the entire structure is inclined towards the first flue gas channel 9. It is specifically designed to prevent the dust that has settled at the bottom of the settling chamber 10 from being stirred up again by the airflow. When the pyrolysis gas flows in the settling chamber 10, it easily disturbs the dust deposited at the bottom. The first dust-collecting grid 4 is located above the dust at the bottom, forming a barrier. The first dust-collecting grid 4 cooperates with the dust conveying device 6 at the bottom of the settling chamber 10. The blocked dust slides down the inclined grid back to the bottom and is discharged in time by the dust conveying device 6.

[0052] The dust collection grid also includes a second dust collection grid 8, one end of which is connected to the upper wall of the settling chamber 10, and the second dust collection grid 8 is inclined toward the direction of the first flue gas passage 9.

[0053] Specifically, one end of the second dust-collecting grid 8 is fixed to the upper wall of the settling chamber 10, and the entire structure is arranged at an angle towards the first flue gas channel 9. Its main function is to block dust from entering the settling chamber 10 from the first flue gas channel 9. When the dust-laden pyrolysis gas enters the settling chamber 10 from the first flue gas channel 9, the airflow first contacts the second dust-collecting grid 8. The angled grid guides and intercepts the airflow, causing the dust in the airflow to collide and adhere to the grid surface, thus reducing the dust content in the airflow.

[0054] The intercepted dust slides down the inclined grid plate to the bottom of the settling chamber 10 under the action of gravity. The second dust collection grid plate 8 achieves preliminary and efficient dust interception, ensuring stable and efficient dust removal.

[0055] More specifically, multiple dust collection grids can be installed in the settling chamber 10. By rationally arranging multiple dust collection grids at different positions in the settling chamber 10, a multi-level and zoned dust interception structure can be formed to capture dust in the airflow layer by layer, thereby improving the dust interception rate and dust collection effect, preventing dust from escaping, making dust removal more thorough, and further improving the cleanliness of the pyrolysis gas.

[0056] Working principle of biomass pyrolysis gas dust removal device The biomass pyrolysis gas containing dust enters the primary horizontal conveying and unblocking device 1. The primary horizontal conveying and unblocking device 1 drives a conveyor shaft 101 to rotate via a motor. A conveying vibrator 102 and spiral conveyor fins 103 are installed on the conveyor shaft 101. The conveying vibrator 102 consists of a circular chain welded at a certain interval at one end to the conveyor shaft 101, with the other end free. When the conveyor shaft 101 rotates, the free end of the circular chain swings with the conveyor shaft 101, vibrating the dust accumulated on the conveyor shaft 101. The spiral conveyor fins 103 are connected to the conveyor shaft 101 via multiple connecting pipes. When the conveyor shaft 101 rotates, the spiral conveyor fins 103 rotate, conveying the dust into the settling chamber 10.

[0057] The pyrolysis gas enters the settling chamber 3 after passing through the primary horizontal conveying and unblocking device 1. Multiple dust-collecting grids are installed inside the settling chamber 3, with the grids angled at more than 60 degrees to the horizontal. This allows dust adhering to the grids to slide down to the bottom of the settling chamber 3 under gravity. The dust-collecting grids block most of the dust in the pyrolysis gas, causing it to settle to the bottom of the settling chamber 3 under gravity.

[0058] The pyrolysis gas passing through the settling chamber 3 enters the secondary horizontal conveying and unblocking device 5, which has the same structure as the primary horizontal conveying and unblocking device 1. After the above-mentioned settling and unblocking, the pyrolysis gas enters the next process stage.

[0059] The dust settled in the settling chamber 3 is transported to the outside of the settling chamber 3 and collected by the dust conveying device 6.

[0060] A high-temperature flue gas interlayer 2 is provided outside the settling chamber 3. The temperature of the high-temperature flue gas is above 500℃, maintaining the temperature of the settling chamber 3 at 300℃-500℃. An insulation layer 7 is provided outside the high-temperature flue gas interlayer 2 to slow down temperature loss.

[0061] More specifically, biomass pyrolysis produces pyrolysis gas, which contains dust and enters a pyrolysis gas dust removal and pipeline cleaning system. The temperature of the pyrolysis gas is between 400℃ and 500℃, and it contains a large amount of dust with a diameter ≤20μm. The pyrolysis gas also contains a large amount of condensable gas, which is released when the temperature is below 250℃.

[0062] High-temperature flue gas at 400℃-500℃ is continuously introduced into the high-temperature flue gas interlayer 2 to ensure that the temperature inside the settling chamber 3 is not lower than 300℃.

[0063] The dust-laden pyrolysis gas enters the primary horizontal conveying and unblocking device 1. The accumulated dust is conveyed to the settling chamber 10 by the conveying and vibrating device 102 and the spiral conveying fins 103. The temperature of the dust-laden pyrolysis gas is 400℃-500℃, and the velocity is about 10m / s-15m / s.

[0064] After the dust-laden pyrolysis gas enters the settling chamber 10, the gas velocity can instantly decrease to 1m / s-3m / s due to the increased cross-sectional area of ​​the pyrolysis gas flow. Affected by the velocity and the dust collection grid, a large amount of dust settles, achieving a dust removal efficiency of over 80%. The settled dust is then transported to the outside of the settling chamber 3 and collected by the dust conveying device 6.

[0065] After dust is settled in the settling chamber 3, the pyrolysis gas enters the secondary horizontal conveying and unblocking device 5. The accumulated dust is conveyed to the settling chamber 10 by the conveying and vibrating device 102 and the spiral conveying fins 103. The temperature of the pyrolysis gas is between 350℃ and 450℃, and the dust content is reduced by more than 20%.

[0066] High-temperature flue gas flow path: The high-temperature flue gas enters from the inlet of the high-temperature flue gas jacket 2, flows along the jacket and surrounds the outer wall of the first flue gas channel 9, the settling chamber 10 and the second flue gas channel 11, continuously heating and insulating the interior, and finally exits from the outlet of the high-temperature flue gas jacket 2, forming a complete heating circuit.

[0067] Pyrolysis gas flow: Dust-laden pyrolysis gas enters from the pyrolysis gas inlet of the first flue gas channel 9, flows through the primary horizontal conveying and clearing device 1 for preliminary dust removal, and then enters the settling chamber 10. In the settling chamber 10, the inlet dust is intercepted by the second dust-collecting grid 8 and the bottom dust is blocked by the first dust-collecting grid 4, thus completing the dust settling. The dust-removed pyrolysis gas enters the second flue gas channel 11, is cleared again by the secondary horizontal conveying and clearing device 5, and finally flows out from the pyrolysis gas outlet of the second flue gas channel 11 to enter the next process stage.

[0068] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.

Claims

1. A biomass pyrolysis gas dust removal device, characterized in that, It includes a settling chamber, which contains a settling cavity. The settling cavity has flue gas channels at both ends, and a conveying device is installed in the flue gas channels. A dust conveying device is installed at the bottom of the settling cavity, and a dust collection grid is installed at the top of the settling cavity. A high-temperature flue gas interlayer is installed inside the outer wall of the settling chamber, and the high-temperature flue gas interlayer surrounds the settling cavity and the flue gas channels.

2. The biomass pyrolysis gas dust removal device as described in claim 1, characterized in that, The flue gas passage includes a first flue gas passage and a second flue gas passage. A primary horizontal conveying and unblocking device is installed in the first flue gas passage, and a secondary horizontal conveying and unblocking device is installed in the second flue gas passage.

3. The biomass pyrolysis gas dust removal device as described in claim 2, characterized in that, One end of the first flue gas channel is a pyrolysis gas inlet, and the other end is connected to the settling chamber; one end of the second flue gas channel is a pyrolysis gas outlet, and the other end is connected to the settling chamber.

4. The biomass pyrolysis gas dust removal device as described in claim 2, characterized in that, The primary horizontal conveying and unblocking device and the secondary horizontal conveying and unblocking device have the same structure. Both the primary horizontal conveying and unblocking device and the secondary horizontal conveying and unblocking device include a conveying shaft, a spiral conveying fin, a fin support rod and a motor. One end of the conveying shaft is connected to the output shaft of the motor, and the motor is located outside the first flue gas channel.

5. A biomass pyrolysis gas dust removal device as described in claim 4, characterized in that, The output shaft is fitted with spiral conveying fins, and fin support rods are arranged alternately around the surface of the output shaft. One end of the fin support rod is connected to the output shaft, and the other end is connected to the spiral conveying fins.

6. The biomass pyrolysis gas dust removal device as described in claim 4, characterized in that, Several conveying vibration devices are spaced apart on the conveying shaft. The conveying vibration device is a chain, and one end of the chain is fixedly connected to the conveying shaft.

7. The biomass pyrolysis gas dust removal device as described in claim 1, characterized in that, The inlet of the high-temperature flue gas jacket is located at one end of the first flue gas channel, and the outlet of the high-temperature flue gas jacket is located at the dust outlet at the bottom of the settling chamber.

8. The biomass pyrolysis gas dust removal device as described in claim 1, characterized in that, An insulation layer is provided on the outside of the high-temperature flue gas interlayer.

9. A biomass pyrolysis gas dust removal device as described in claim 1, characterized in that, The dust collection grid includes a first dust collection grid, one end of which is connected to the side wall of the settling chamber, and the first dust collection grid is inclined toward the direction of the first flue gas passage.

10. A biomass pyrolysis gas dust removal device as described in claim 1, characterized in that, The dust collection grid also includes a second dust collection grid, one end of which is connected to the upper wall of the settling chamber, and the second dust collection grid is inclined toward the direction of the first flue gas passage.

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