Flow control valve for pneumatic conveying of biomass pellets or powder

Abstract

The present invention belongs to the field of valve technology, and specifically relates to a pneumatic conveying flow control valve for biomass particles or powders. The valve core of the present invention is connected to a linear power source via a valve stem, and the bottom of the valve cavity constitutes a medium outlet; an inlet passage is provided on one side of the valve cavity, and a valve seat is arranged in the inlet passage, and a sealing surface sliding fit relationship is formed between the valve seat and the side wall of the valve core; a flow window is provided on the side wall of the valve core, and the cylindrical cavity shape at the inner end of the valve seat matches the shape of the flow window; a guide block is arranged at the barrel mouth of the valve core; a purge flow channel is arranged in the valve stem, and the gas enters the air inlet purge cavity through the purge port provided on the valve body or valve cover, and then enters the purge flow channel through the air inlet provided on the valve stem, and finally blows out through the preset air holes on the guide block. The present invention can achieve the smooth passage of biomass particles or powders, and effectively reduce or even avoid the blockage problem caused by the poor fluidity and easy agglomeration characteristics of biomass particles or powders.

Description

Technical Field

[0001] The invention belongs to the technical field of valves, and in particular relates to a flow control valve for pneumatic conveying of biomass particles or powder. Background Art

[0002] Biomass is an important renewable energy source; biomass gasification technology can achieve higher utilization rates at a smaller scale and provide a high-grade energy form, making it an important technology for the clean and efficient use of biomass. Currently, the more feasible biomass gasification technology can be referred to the text of patent publication number "CN106705028A". The main process route is: first, biomass is prepared into particles or powder, which is transported to a biomass incinerator or biomass gasifier through a pneumatic conveying pipeline. At the same time, oxygen or oxygen-containing substances are used as gasifying agents to convert the combustible part of the biomass fuel into combustible gases (mainly hydrogen, carbon monoxide and methane) under high temperature conditions. The main technical difficulty in this process is that in order to meet the continuous controllability of the gasification process, it is necessary to stably control the delivery flow of solid phase media such as biomass particles or powders. However, the control valves in the prior art often cannot achieve this goal. The biggest reason is that the poor flowability and easy agglomeration of biomass particles or powders make the control valves in the prior art very prone to blockage during use. Furthermore, the angled design of existing control valves, coupled with the inherent placement of the valve seat on the outlet side of the valve cavity, further exacerbates the aforementioned blockage problem. This particular positioning of the valve seat makes it difficult to achieve a fluidized design between the outlet valve seat and the valve core, exacerbating the blockage problem. Clearly, most current biomass gasification systems require continuous feedstock. If this blockage occurs, it can cause significant fluctuations in the operating conditions of the biomass incinerator or biomass gasifier, or even shut down the furnace, resulting in irreparable production losses. Therefore, a solution is urgently needed. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a pneumatic conveying flow control valve for biomass particles or powders with a compact and reasonable structure, which can achieve the smooth passage of biomass particles or powders and effectively reduce or even avoid the blockage problem caused by the poor fluidity and easy agglomeration characteristics of biomass particles or powders.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A flow control valve for pneumatic conveying of biomass particles or powders, characterized in that it includes a valve body, a valve cavity for accommodating a valve core disposed within the valve body, the valve core being connected to a linear power source via a valve stem, thereby enabling the valve core to perform reciprocating linear motion along the axial direction of the valve cavity, with the bottom of the valve cavity constituting a medium outlet; an inlet passage being provided through one side of the valve cavity, with a valve seat disposed within the inlet passage; and an elastic member capable of applying an inward force along the axial direction of the valve seat, wherein the inner end of the valve seat is pressed against a side wall of the valve core by the elastic member, and forms a sealing surface-type sliding fit with the side wall of the valve core.

[0006] The valve core is in the shape of a barrel with a barrel mouth, and a flow window is opened on the side wall of the valve core. The outer shape of the cylindrical cavity at the inner end of the valve seat is consistent with the outer shape of the flow window; a guide block is arranged at the barrel mouth of the valve core for connecting the flow window and the medium outlet in a smooth transition shape; a purge flow channel is arranged in the valve stem, and an air intake purge chamber is formed by a section of the valve cavity between the outer barrel bottom of the valve core and the top wall of the valve cavity. After the gas enters the air intake purge chamber through the purge port opened on the valve body or the valve cover, it enters the purge flow channel through the air inlet opened on the valve stem, and finally is blown out through the preset air hole on the guide block; the axis of the air hole is parallel to the axis of the valve core or is arranged obliquely along the slope direction of the guide surface of the guide block.

[0007] Preferably, the axis of the inlet passage and the axis of the valve core intersect with each other, and the tip of the angle formed points in the direction of the medium outlet.

[0008] Preferably, a guide sleeve is coaxially arranged in the valve cavity, with the outer wall pressed against the valve cavity wall, and the inner wall of the guide sleeve is radially protruded with guide ribs, the length direction of the guide ribs is parallel to the axial direction of the valve core, and the guide ribs are uniformly distributed on the inner wall of the guide sleeve in sequence around the axis of the guide sleeve; the inner annular surface enclosed by the guide ribs constitutes a sliding surface for the axial sliding of the valve seat, and the flow window is opened between two adjacent guide ribs; the guide sleeve is provided with an avoidance opening for the inner end of the valve seat to pass through.

[0009] Preferably, a guide sleeve is coaxially arranged in the valve cavity, and its outer wall is pressed against the valve cavity wall. The inner wall of the guide sleeve is radially protruded with guide ribs, and the length direction of the guide ribs intersects with the axial direction of the valve core. The guide ribs are evenly distributed on the inner wall of the guide sleeve in sequence around the axis of the guide sleeve and form a multi-helical structure; the inner annular surface enclosed by the guide ribs constitutes a sliding surface for the axial sliding of the valve seat, and the flow window is opened between two adjacent guide ribs; the guide sleeve is provided with an avoidance opening for the inner end of the valve seat to pass through.

[0010] Preferably, a baffle is coaxially arranged on the rod body below the air inlet of the valve stem, and a sealing surface sliding fit is formed between the outer wall of the baffle and the inner wall of the guide sleeve; a connecting hole is arranged through the baffle to connect the air inlet purge cavity and the air flow channel between the adjacent guide ribs.

[0011] Preferably, along the direction of the valve core's travel, the guide sleeve is formed by coaxially matching a purge sleeve and an outlet sleeve that are arranged in sequence, and the guide ribs are arranged on both the purge sleeve and the outlet sleeve.

[0012] Preferably, the cylindrical cavity of the outlet bushing close to the medium outlet is in the shape of a tapered hole with a gradually decreasing aperture.

[0013] Preferably, a transition bushing and a valve seat are sequentially arranged in the inlet passage along the flow direction of the solid medium; or a sealing ring having sealing and elastic compensation effects is arranged between the valve seat and the transition bushing, or between the valve seat and the inlet passage, or between the transition bushing and the inlet passage, and the sealing ring constitutes the elastic member; the cross-section of the inner cavity of the valve seat is rectangular, and the inner cavity of the transition bushing has a smooth transition structure from a circular shape at the inlet to a rectangular shape at the outlet.

[0014] Preferably, a countersunk hole is arranged in the inlet passage, the outer end of the valve seat is in contact with the bottom of the countersunk hole, and a sealing ring is arranged between the two to perform sealing and elastic compensation effects, and the sealing ring constitutes the elastic part; the inner cavity of the valve seat has a smooth transition structure from a circular shape at the inlet to a rectangular shape at the outlet.

[0015] Preferably, the linear power source is a linear actuator.

[0016] The beneficial effects of the present invention are:

[0017] 1) Through the above-mentioned solution, the present invention, on the one hand, takes a novel approach by placing the valve seat on the medium inlet side and forming a seal with the side of the valve core along the solid-phase medium flow direction. Under the action of the elastic member and the medium force, the sealing surface of the valve seat and the valve core forms a sealing pressure ratio. Furthermore, when the valve of the present invention is in the closed state, it effectively confines granular or powdered solid-phase medium to the valve inlet side, eliminating the need for the valve cavity where the valve stem of the valve core is located to withstand high pressure, and the valve stem packing seal also does not need to withstand high pressure, effectively ensuring the service life of the valve stem packing seal. When the valve is in the open state, the flow window on the valve core gradually emerges in the valve seat flow channel, allowing the solid-phase medium to flow from the valve seat flow channel through the flow window on the valve core to the downstream side. Combined with the valve's angled structure, this ensures a clean valve cavity with no dead corners, preventing solid-phase medium from accumulating. Furthermore, the downward movement of the valve core, combined with the medium outlet at the bottom of the valve body, creates a closed-flow structure for the entire valve that protects the sealing surface. This also effectively reduces erosion and abrasion of the valve trim, extending the service life of the valve. At the same time, since the flow direction of the solid-containing medium when flowing out of the valve core is parallel to the axis of the valve cavity outlet flow channel and is located in the center of the flow channel, the erosion of the downstream valve cavity wall by the solid-containing medium after throttling is avoided, with significant results.

[0018] On the other hand, when actually designing the present invention, it is preferred that the valve core is a sleeve-type structure. At this time, the solid-phase medium flows from the valve seat through the flow window on the valve core to the internal cavity of the valve core, and the flow window opened on the valve core can be set to different forms such as circular, rectangular, triangular, and teardrop-shaped, thereby achieving different flow regulation characteristics. Compared with the control valve in the prior art, under the same throttling area conditions, the valve opening of the present invention is larger, the passability of the solid-phase medium is better, and it is more conducive to avoiding the obstruction and blockage of the solid-phase medium. On this basis, the present invention also adds a guide block inside the valve core, which is conducive to guiding the fluid to flow into the internal cavity of the valve core, and then it can flow smoothly to the downstream through the guide surface on the guide block, avoiding the turbulent flow of the solid-phase medium after throttling, and slowing down its erosion of the valve internals and even the valve cavity. In particular, with the air holes on the guide block, external gas is flowed into the purge flow channel of the valve stem through the air inlet purge chamber and finally blown out through the purge port. At this time, the airflow and the solid phase medium travel in the same direction, which helps the solid phase medium to form a more passable gas-containing state with a higher initial velocity, and ultimately effectively reduces or even avoids the blockage problem caused by the poor fluidity and easy agglomeration characteristics of biomass particles or powders.

[0019] 2) The axis of the inlet channel and the axis of the valve core intersect with each other. At this time, the inlet channel of the valve and the medium outlet form an angle along the flow direction of the solid-phase medium, which can make the throttling reversing angle of the medium flow smaller, which is conducive to the smoother flow of the solid-phase medium to the downstream, further ensuring the working effect of the present invention.

[0020] 3) A guide sleeve with guide ribs is provided on the outside of the valve core to facilitate stable guidance of the valve core during its reciprocating motion; the valve core is subject to a certain lateral force under the condition of valve seat sealing, and the guide sleeve with guide ribs can provide support. The contact area between the guide ribs and the valve core is small, so the friction resistance during the movement of the valve core is also small, which is conducive to the effective movement of the valve core. The guide ribs can be parallel lines or designed to be spirally distributed along the reciprocating motion direction of the valve core; spirally distributed guide ribs are more conducive to providing support and reaction force to the valve core when it is subjected to sealing force, and can also make the guide ribs better guide and wrap the valve core without increasing the contact area.

[0021] 4) Because the valve core and guide sleeve are guided by guide ribs, the purge gas flows from the valve body through the gap between the valve core and the guide sleeve, sweeping the solid-phase medium in the valve cavity downstream. When the guide ribs are distributed in a spiral pattern, they can help the purge gas form a swirl, thereby better agitating the solid-phase medium in the valve cavity, allowing the solid-phase medium to be discharged smoothly from the valve downstream, minimizing the risk of siltation and blockage.

[0022] 5) A baffle is set between the valve stem and the guide sleeve, mainly to facilitate centralized purging; when the gas enters the air intake purge chamber, it will stay in the air intake purge chamber for a short time, and then most of the gas will be rectified through the connecting holes evenly distributed on the baffle, and then purged to the downstream through the air flow channel between adjacent guide ribs; while less gas will enter the valve stem due to the obstruction of the baffle and finally be purged to the downstream through the air holes of the guide block.

[0023] At this point, it can be seen that the valve core requires sufficient wind force around its periphery to wrap around the solid-phase medium and achieve the purpose of enveloping and pushing the solid-phase medium; while the guide surface of the guide block only requires relatively small wind force to "push" the solid-phase medium. Therefore, the outer area of the valve core serves as the main wind force area, requiring a larger wind force from the connecting holes on the baffle. High wind force combined with densely distributed connecting holes can meet this requirement. The air holes serve as the auxiliary pushing area, requiring less gas from the guide surface to achieve the auxiliary diversion effect. Low wind force, a narrow purge flow channel, and densely distributed air holes can meet this requirement. The combination of the two can significantly reduce the risk of blockage.

[0024] Since the flow direction of the biomass material after flowing into the valve core is parallel to the axis of the valve cavity outlet flow channel, and the solid phase flow is mainly concentrated in the middle, it is conducive to the smooth transportation of the solid phase material to the downstream, avoiding problems such as agglomeration and blockage; secondly, due to the wall flow of the purge airflow, a covering conveying effect is formed on the solid phase material, which can also avoid problems such as erosion and abrasion of the valve cavity by the solid phase material.

[0025] 6) Furthermore, when the opening on the valve core, that is, the flow channel window, is rectangular, the cross-section of the entire inlet path is preferably transitioned from a circular loft to a rectangle, and adapted to the rectangular flow window on the valve core. With this arrangement, the solid-phase medium can smoothly transition from the circular flow channel to the rectangular flow channel, and finally enter the flow window. The entire flow channel smoothly transitions without dead angles or obstacles, thereby making it less likely that the solid-phase medium will be stuck or clogged at the throttling surface. Accordingly, when the valve seat is used alone, the inner cavity of the valve seat needs to be designed as the above-mentioned lofted structure, and when it is used in conjunction with a transition bushing, the sleeve cavity of the transition bushing can be designed as the above-mentioned lofted structure. The change in the shape of the flow channel cross section is set in the valve seat or transition bushing, which can reduce the difficulty of the manufacturing process of components such as the valve body, and is more advantageous because the valve seat or transition bushing is easy to replace and maintain later.

[0026] 7) In the actual design, the guide sleeve is formed by the coaxial combination of the purge sleeve and the outlet sleeve, which are arranged in sequence. Guide ribs are provided on both sides, with the specific details being determined so as not to affect the basic movement of the valve core. This allows the guide sleeve to continue to accurately guide the valve core's movement path with the help of the guide ribs. On the other hand, the outlet sleeve area, close to the medium outlet, is subject to impact and abrasion from the solid phase medium. Therefore, the separate outlet sleeve is replaceable, meeting the needs of daily use and facilitating subsequent maintenance, which is a further advantage.

[0027] 8) The medium outlet of the present invention can also be provided with different types of outlet bushings according to different process requirements, so as to adapt to different on-site application conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 and Figure 2 are structural cross-sectional views of two embodiments of the present invention;

[0029] Figure 3 for Figure 2 A partial enlarged view of part I.

[0030] The actual correspondence between the reference numerals and component names of the present invention is as follows:

[0031] a-intake purge chamber;

[0032] 10-valve body; 11-purge port; 20-valve core; 21-flow window;

[0033] 30-valve stem; 31-purge flow channel; 32-air inlet; 40-straight stroke power source;

[0034] 50-valve seat; 51-elastic member; 60-guide block; 61-air hole;

[0035] 70-guide sleeve; 70a-purge bushing; 70b-outlet bushing; 71-guide rib; 72-avoidance;

[0036] 80-baffle; 81-connecting hole; 90-transition bushing. DETAILED DESCRIPTION

[0037] For ease of understanding, here we combine Figure 1-Figure 3 The specific structure and working mode of the present invention are divided into the following two groups of embodiments, which are further described below:

[0038] Example 1:

[0039] In this embodiment, the actual structure of the present invention is referred to Figure 2-Figure 3 As shown, the whole still adopts an angle structure, with upper inlet and side outlet, that is, the valve cavity is arranged in the valve body 10 and formed as shown in FIG. Figure 1 The side outlet of the medium is connected to the upper part of the valve cavity through the inlet channel; in conjunction with the linear hydraulic actuator constituting the linear power source 40, the reciprocating flow-closing action of the valve core 20 can be achieved, wherein:

[0040] like Figure 1As shown, the valve seat 50 is located at the side of the inlet passage. The valve seat 50 achieves floating elastic compensation through an elastic structure such as a sealing ring or compression spring as an elastic member 51, ensuring a sealed abutment between the valve seat 50 and the outer wall of the cylindrical valve core 20. Furthermore, since the valve core 20 is inherently sleeve-shaped, a guide block 60 can be added internally. The guide surface of the guide block 60 creates an arc-shaped transition between the inlet and outlet flow directions of the valve.

[0041] In addition, if Figure 2 As shown, a guide sleeve 70 is also provided on the outside of the valve core 20. The guide sleeve 70 is provided with a number of guide ribs 71 evenly distributed around the axis, so that the inner sides of the guide ribs 71 cooperate with the valve core 20 for guidance. The arrangement of the guide ribs 71 is also particular. They may be arranged as multiple parallel guide ribs 71 extending axially, or as a single or multiple spiral structures intersecting the axis of the valve core 20. Taking multiple parallel guide ribs 71 extending axially as an example, preferably, when there are three guide ribs 71 evenly distributed around the axis of the guide sleeve 70, the side opening 72 on the guide sleeve 70 through which the inner end of the valve seat 50 passes should be located between two guide ribs 71. The third guide rib 71 is located on the other side of the valve core 20 relative to the flow window 21 and is located in the same direction as the sealing pressure of the valve seat 50. When the valve core 20 is subjected to the sealing force from the valve seat 50, the third guide rib 71 primarily provides the counterforce.

[0042] In actual design, the guide sleeve 70 is formed by coaxially matching the purge sleeve 70 a and the outlet sleeve 70 b which are arranged in sequence, and both are provided with guide ribs 71 , so as not to affect the basic movement of the valve core 20 .

[0043] On the basis of the above structure, a gas channel is formed between adjacent guide ribs 71, and the guide block 60 also has an air hole 61 extending along the axial direction of the valve core 20; in other words, the solid phase medium is now surrounded by air flow in the middle and periphery of the passage path along the medium outlet. The specific air flow formation depends on the following: Figure 1 The shown purge port on the valve cover provides an air source. Of course, the purge port may be positioned on the valve body 10.

[0044] During operation, the gas enters the air inlet purge chamber a in the upper area of the valve cavity through the purge port opened on the valve cover, then enters the purge flow channel 31 in the valve stem 30 through the air inlet 32 opened on the valve stem 30, and finally blows out through the preset air hole 61 on the guide block 60. Since the purge direction of the purge gas is consistent with the flow direction of the solid phase medium, this is conducive to blowing the biomass particles or powder to the downstream, and is less likely to cause risks such as blockage. In actual arrangement, the air hole 61 can be directly parallel to the axis of the valve core 20, or it can be slightly tilted to one side along the slope direction of the guide surface of the guide block 60, all to ensure that the purge direction of the purge gas is consistent or roughly consistent with the flow direction of the solid phase medium.

[0045] Furthermore, an outlet bushing 70b may be provided at the medium outlet. The outlet bushing 70b may be a straight cylinder type, an outward expansion type, a contraction type, etc. It only needs to be assembled in the lower part of the valve cavity, and will not be described in detail here.

[0046] Example 2:

[0047] The actual structure of this embodiment is basically the same as that of embodiment 1, but the following two points should be noted:

[0048] First, in the specific implementation structure shown in Figure 1, the axis of the inlet channel and the axis of the valve core 20 intersect with each other. At this time, the inlet channel and the medium outlet form a specific angle of 60° along the flow direction of the solid phase medium, which can make the throttling reversing angle of the medium flow smaller, which is conducive to the smoother flow of the solid phase medium to the downstream, further ensuring the working effect of the present invention. Figure 2-Figure 3 In the specific implementation structure shown, there is only one set of valve seats 50 at the inlet channel, and no transition sleeve 90 is designed. It should be noted that when the flow channel window 21 is rectangular, the inner cavity of the valve seat 50 should be arranged as a lofting structure from a circular outer end to a rectangular inner end.

[0049] Secondly, a baffle 80 is provided between the valve stem 30 and the guide sleeve 70, primarily to facilitate centralized purging. After gas enters the inlet purge chamber a, it briefly remains there. Some of the gas then flows through the evenly distributed connecting holes 81 on the baffle 80 and is purged downstream through the airflow channels between adjacent guide ribs 71. The remaining gas, blocked by the baffle 80, enters the valve stem 30 and is ultimately purged downstream through the air holes 61 of the guide block 60, ensuring sufficient fluidization of the solid phase medium.

[0050] At this point, the valve core 20 requires sufficient wind power at its periphery to wrap around the solid-phase medium and achieve the purpose of enveloping and pushing the solid-phase medium; while the guide surface of the guide block 60 only requires relatively small wind power to "push" the solid-phase medium. Therefore, the outer area of the valve core 20 serves as the main wind zone, requiring the baffle 80 to pass a relatively large wind power. Large wind power combined with densely distributed connecting holes 81 can meet this requirement; while the guide surface of the guide block 60 serves as an auxiliary pushing area, requiring less gas on the guide surface to achieve an assisting diversion effect. Small wind power, a narrow and long purge flow channel 31, and densely distributed air holes 61 can meet this requirement. The combination of the two can significantly reduce the risk of blockage. Its design is ingenious and reliable, with significant results.

[0051] Of course, it will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, but also encompasses the same or similar embodiments that can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered in all respects as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description.

[0052] Furthermore, it should be understood that although this specification describes the embodiments, not every embodiment contains only one independent technical solution. This description is for clarity only. Those skilled in the art should consider this specification as a whole. The technical solutions in the various embodiments may also be appropriately combined to form other embodiments that are understandable to those skilled in the art. Any technical aspects not described in detail in this invention are well-known technologies.

Claims

1. Biomass pellet or powder pneumatic conveying flow control valve, characterized by: The invention comprises a valve body (10), wherein a valve cavity for accommodating a valve core (20) is arranged in the valve body (10), and is characterized in that: the valve core (20) is connected to a linear power source (40) via a valve stem (30), so that the valve core (20) can perform reciprocating linear motion along the axial direction of the valve cavity, and the bottom of the valve cavity constitutes a medium outlet; an inlet passage is provided through one side of the valve cavity, and a valve seat (50) is arranged in the inlet passage; and the invention also comprises an elastic member (51) that can apply force inward along the axial direction of the valve seat (50), and the inner end of the valve seat (50) is pressed against the side wall of the valve core (20) by the elastic member (51), and forms a sealing surface-type sliding fit relationship with the side wall of the valve core (20); The valve core (20) is in the shape of a barrel with a barrel mouth, and a flow window (21) is provided on the side wall of the valve core (20). The outer shape of the cylindrical cavity at the inner end of the valve seat (50) matches the outer shape of the flow window (21). A guide block (60) for connecting the flow window (21) and the medium outlet in a smooth transition shape is arranged at the barrel mouth of the valve core (20). A purge flow channel (31) is arranged in the valve stem (30). The valve core (20) is provided with a valve between the outer barrel bottom of the valve core (20) and the top wall of the valve cavity. The cavity forms an air intake purge cavity (a), and the gas enters the air intake purge cavity (a) through the purge port (11) provided on the valve body (10) or the valve cover, then enters the purge flow channel (31) through the air intake port (32) provided on the valve stem (30), and finally blows out through the air hole (61) preset on the guide block (60); the axis of the air hole (61) is parallel to the axis of the valve core (20) or is arranged obliquely along the slope direction of the guide surface of the guide block (60).

2. The pneumatic conveying flow control valve for biomass particles or powder according to claim 1, characterized in that: The axis of the inlet passage and the axis of the valve core (20) intersect with each other, and the tip of the angle formed points in the direction of the medium outlet.

3. The pneumatic conveying flow control valve for biomass particles or powder according to claim 2, characterized in that: A guide sleeve (70) is coaxially arranged in the valve cavity, and its outer wall is pressed against the valve cavity wall. A guide rib (71) is radially protruded on the inner wall of the guide sleeve (70). The length direction of the guide rib (71) is parallel to the axial direction of the valve core (20). Each guide rib (71) is uniformly distributed on the inner wall of the guide sleeve (70) around the axis of the guide sleeve (70); the inner annular surface enclosed by each guide rib (71) constitutes a sliding surface for the axial sliding of the valve seat (50), and the flow window (21) is opened between two adjacent guide ribs (71); and an avoidance opening (72) is opened on the guide sleeve (70) for the inner end of the valve seat (50) to pass through.

4. The pneumatic conveying flow control valve for biomass particles or powder according to claim 2, characterized in that: A guide sleeve (70) is coaxially arranged in the valve cavity, and its outer wall is pressed against the valve cavity wall. A guide rib (71) is radially protruded on the inner wall of the guide sleeve (70). The length direction of the guide rib (71) intersects with the axial direction of the valve core (20). Each guide rib (71) is uniformly distributed on the inner wall of the guide sleeve (70) around the axis of the guide sleeve (70) and forms a multi-helical structure; the inner annular surface enclosed by each guide rib (71) constitutes a sliding surface for the axial sliding of the valve seat (50), and the flow window (21) is opened between two adjacent guide ribs (71); and an avoidance opening (72) is opened on the guide sleeve (70) for the inner end of the valve seat (50) to pass through.

5. The pneumatic conveying flow control valve for biomass particles or powder according to claim 3 or 4, characterized in that: A baffle (80) is coaxially arranged on the stem below the air inlet (32) of the valve stem (30), and a sealing surface type sliding fit is formed between the outer wall of the baffle (80) and the inner wall of the guide sleeve (70); a connecting hole (81) is arranged through the baffle (80) to connect the air inlet purge chamber (a) and the air flow channel between the adjacent guide rib (71).

6. The pneumatic conveying flow control valve for biomass particles or powder according to claim 3 or 4, characterized in that: Along the process movement direction of the valve core (20), the guide sleeve (70) is formed by coaxially matching the purge sleeve (70a) and the outlet sleeve (70b) arranged in sequence, and the guide ribs (71) are arranged on both the purge sleeve (70a) and the outlet sleeve (70b).

7. The pneumatic conveying flow control valve for biomass particles or powder according to claim 6, characterized in that: The cylindrical cavity of the outlet bushing (70b) close to the medium outlet is in the shape of a tapered hole with a gradually decreasing aperture.

8. The pneumatic conveying flow control valve for biomass particles or powder according to claim 1, 2, 3 or 4, characterized in that: Along the flow direction of the solid-phase medium, a transition bushing (90) and a valve seat (50) are arranged in sequence in the inlet passage; or a sealing ring having a sealing and elastic compensation effect is arranged between the valve seat (50) and the transition bushing (90), or between the valve seat (50) and the inlet passage, or between the transition bushing (90) and the inlet passage, and the sealing ring constitutes the elastic member (51); the cross-section of the inner cavity of the valve seat (50) is rectangular, and the inner cavity of the transition bushing (90) is a smooth transition structure from a circular inlet to a rectangular outlet.

9. The pneumatic conveying flow control valve for biomass particles or powder according to claim 1, 2, 3 or 4, characterized in that: A countersunk hole is arranged in the inlet cavity, the outer end of the valve seat (50) is in contact with the bottom of the countersunk hole, and a sealing ring is arranged between the two to achieve sealing and elastic compensation effects. The sealing ring constitutes the elastic member (51); the inner cavity of the valve seat (50) is in a smooth transition shape from a circular inlet to a rectangular outlet.

10. The pneumatic conveying flow control valve for biomass particles or powder according to claim 1, 2, 3 or 4, characterized in that: The linear power source (40) is a linear actuator.

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