An RTO high-temperature relief valve device for VOCs waste gas treatment

Abstract

The present application relates to the technical field of atmospheric pollution treatment, and particularly relates to a RTO high-temperature bleeder valve device for VOCs waste gas treatment, which is used for discharging mixed high-temperature flue gas and low-temperature flue gas after mixing, and comprises: a valve body, which is provided with a high-temperature flue gas inlet, a low-temperature flue gas inlet and a mixed flue gas outlet; a valve seat with a sealing surface, which is arranged at the high-temperature flue gas inlet; a valve plate arranged in the valve body, which has a sealing structure matched with the sealing surface of the valve seat; and a driving mechanism for driving the lifting movement of the valve plate. The present application adopts a lifting valve plate structure, and when opened, the valve plate is lowered to retreat into the low-temperature area at the lower part of the valve body, and is separated from the main flow channel of the high-temperature flue gas. A conical sealing pair is formed by a soft high-temperature resistant material and a hard valve seat, and the compressibility of the soft material is used to absorb thermal expansion, so that an expansion gap is not needed, the inherent leakage is reduced, and the valve seat and the valve plate are both detachable modular structures, so that the sealing consumables can be replaced individually.

Description

Technical Field

[0001] This invention relates to the field of air pollution treatment technology, and in particular to an RTO high-temperature relief valve device for VOCs waste gas treatment. Background Technology

[0002] Regenerative thermal oxidizers (RTOs) have become the mainstream equipment for VOCs waste gas treatment due to their advantages such as high thermal efficiency (up to 95% or more) and strong ability to handle large volumes of low-concentration organic waste gas. To ensure the safe operation of RTO systems, the industry usually chooses to install high-temperature discharge bypass pipes and high-temperature bypass valves in the furnace. When the furnace temperature or pressure exceeds the safety threshold, the valve is opened to release excess heat.

[0003] However, most high-temperature bypass valves currently in use adopt a butterfly valve structure, which consists of a metal valve body, an insulation lining, and a metal valve plate. Since the valve operates in a high-temperature environment of 760-1000℃ for a long time, the metal valve plate and valve shaft are prone to high-temperature deformation and jamming. In addition, the leakage of the steel hard sealing surface increases after being heated and expanded, and the heat loss of the system increases accordingly. Once the valve is damaged, it needs to be replaced as a whole, and the shutdown and cooling period can last for more than 3 days, affecting the user's normal production. Summary of the Invention

[0004] In view of this, the purpose of this invention is to propose an RTO high-temperature relief valve device for VOCs waste gas treatment, so as to improve the valve's working environment, extend its service life and reduce maintenance costs.

[0005] To achieve the above objectives, the present invention provides an RTO high-temperature venting valve device for VOCs waste gas treatment, used to internally mix high-temperature flue gas and low-temperature flue gas before discharging, comprising:

[0006] The valve body is equipped with a high-temperature flue gas inlet, a low-temperature flue gas inlet, and a mixed flue gas outlet.

[0007] A valve seat with a sealing surface is disposed at the inlet of the high-temperature flue gas;

[0008] A valve plate disposed inside the valve body has a sealing structure adapted to the sealing surface of the valve seat;

[0009] The system includes a drive mechanism for driving the valve plate to move up and down. When the high-temperature flue gas inlet needs to be closed, the drive mechanism drives the valve plate to rise, so that the sealing structure fits and seals with the sealing surface. When the high-temperature flue gas inlet needs to be opened, the drive mechanism drives the valve plate to descend to the low-temperature zone at the bottom of the valve body, so that the valve plate is removed from the main flow channel of the high-temperature flue gas.

[0010] As a preferred embodiment of the present invention, the driving mechanism includes:

[0011] The valve stem is fixedly connected to the valve plate;

[0012] A valve stem guide device is provided in the valve body, and the valve stem guide device has a groove inside for the valve stem to slide up and down;

[0013] A drive device mounting bracket is located at the bottom of the exterior of the valve body;

[0014] And a drive device mounted on the drive device mounting bracket, the drive device having a lifting movable end, the movable end being fixedly connected to the other end of the valve stem away from the valve plate.

[0015] As a preferred embodiment of the present invention, the driving device is any one of a cylinder, a hydraulic cylinder, or an electric actuator.

[0016] As a preferred embodiment of the present invention, the valve seat is a replaceable structure, and the valve plate includes:

[0017] Upper and lower clamping plates;

[0018] And a soft, high-temperature resistant material disposed between the upper and lower clamping plates, wherein the soft, high-temperature resistant material has a conical or stepped structure and is clamped and fixed by the upper and lower clamping plates.

[0019] As a preferred technical solution of the present invention, the valve stem and the valve plate are detachably modularly connected. The outer surface of the top end of the valve stem is machined with an external thread section. The valve plate is provided with a through hole that passes through its upper and lower ends. After the external thread section passes through the through hole, the valve plate is fixed to the valve stem by a locking nut.

[0020] As a preferred embodiment of the present invention, a cap is provided at the top of the valve plate, the cap is bolted to the upper clamping plate and covers the external thread section and the locking nut; a mounting limiting plate is provided at the bottom of the lower clamping plate, the mounting limiting plate has a limiting hole for the valve stem to pass through, and after the valve stem passes through the mounting limiting plate, its end face abuts against the lower end face of the mounting limiting plate to form an axial limit.

[0021] As a preferred embodiment of the present invention, the soft high-temperature resistant material is composed of multiple layers of soft, compressible, soft high-temperature resistant material monomers stacked together, with high-temperature resistant support plates and brackets provided between each layer, and the diameter of the support plate being smaller than the diameter of the soft high-temperature resistant material monomer.

[0022] As a preferred embodiment of the present invention, the device further includes a heat insulation component disposed between the high-temperature flue gas inlet and the valve plate cooling chamber, the heat insulation component comprising:

[0023] The door is rotatably connected to the valve body via a rotating shaft structure and is equipped with a reset mechanism. When the valve plate descends, it opens the door. After it is in position, the door automatically closes by relying on the reset mechanism, dividing the internal chamber of the valve body into an upper mixing chamber and a lower cooling chamber, so that the mixing chamber and the cooling chamber are not connected to each other, thereby sealing the valve plate in an independent cooling chamber.

[0024] As a preferred embodiment of the present invention, the device further includes:

[0025] The cooling chamber has a cooling air inlet and a cooling air outlet. The upper end of the cooling chamber has an opening for the valve plate to enter and exit. There are two insulation doors, which are symmetrically mounted at the openings via hinges. The bottom of the cooling chamber has a clearance groove for the valve stem guide device to pass through.

[0026] As a preferred embodiment of the present invention, the device diverts a stream of cold air from the low-temperature flue gas inlet pipe, which then enters the cooling air inlet tangentially after passing through a regulating valve and a one-way valve, directly reaching the cooling chamber of the cooling cavity. The inner wall of the cooling chamber is provided with an inner spiral guide plate to guide the cold air to flow around the valve plate along a spiral path. The cooled hot air is discharged into the mixing chamber through the one-way valve to mix with the high-temperature flue gas before being discharged from the cooling air outlet. The cooling cavity has an annular cavity structure, and an annular flow channel is formed between its outer wall and the inner wall of the valve body. An outer spiral guide plate is provided on the outer circumferential surface of the cooling cavity to guide the low-temperature flue gas to spiral upward so as to form a convective mixture with the high-temperature flue gas discharged downward from the high-temperature flue gas inlet.

[0027] The beneficial effects of this invention are as follows: This invention adopts a lifting valve plate structure. When opened, the valve plate descends and retracts into the low-temperature zone at the bottom of the valve body, separating it from the main high-temperature flue gas channel. A conical sealing pair is formed by using soft high-temperature resistant material and hard valve seat. The compressibility of the soft material absorbs thermal expansion, eliminating the need for a pre-reserved expansion gap and reducing inherent leakage. Both the valve seat and valve plate are detachable modular structures, allowing for individual replacement of sealing materials. An additional insulation door is added to enclose the valve plate in a cooling chamber. Combined with a spiral guide plate, cooling air is introduced for forced convection heat exchange, further reducing the thermal load on the valve plate. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0030] Figure 2 This is a schematic diagram of the main structure of the present invention;

[0031] Figure 3 This is a side sectional view of the present invention;

[0032] Figure 4 This is a schematic diagram of the half-section three-dimensional structure of the present invention;

[0033] Figure 5 This is a schematic diagram of the main structure of the valve plate of the present invention;

[0034] Figure 6 This is a schematic diagram of the side cross-section of the valve plate of the present invention;

[0035] Figure 7 This is a schematic diagram of the main cross-sectional structure of the valve plate and valve seat of the present invention;

[0036] Figure 8 This is a schematic diagram of the valve plate in half section of the present invention.

[0037] Figure 9 This is a three-dimensional structural diagram of the valve plate in its disassembled state according to the present invention;

[0038] Figure 10 This is a three-dimensional structural diagram of the valve body and cooling cavity of the present invention;

[0039] Figure 11 This is a schematic diagram of the connection structure between the valve body and the cooling chamber of the present invention;

[0040] Figure 12 This is a partial cross-sectional three-dimensional structural diagram of the valve body and cooling cavity of the present invention;

[0041] Figure 13 This is a bottom-view perspective view of the bottom structure of the valve body and cooling cavity of the present invention.

[0042] Figure 14 This is a partial cross-sectional three-dimensional structural diagram of the cooling cavity and valve plate of the present invention;

[0043] Figure 15 This is a top-view three-dimensional structural diagram of the cooling cavity of the present invention;

[0044] Figure 16 This is a three-dimensional structural diagram of the connecting rod, first hinge, mounting plate, second hinge, push rod, slider, slide groove, base plate and spring of the present invention.

[0045] The components in the diagram are labeled as follows: 1. Valve body; 2. Valve seat; 3. High-temperature flue gas inlet; 4. Valve plate; 4.1. Upper clamping plate; 4.2. Lower clamping plate; 4.3. Soft high-temperature resistant material; 4.31. Soft high-temperature resistant material unit; 4.4. Sealing cap; 4.5. Mounting limit plate; 4.6. Support plate; 4.61. Support groove; 4.7. Support; 4.8. Fastening bolt; 4.9. Fastening nut; 5. Valve stem; 6. Valve stem guide device; 7. Drive device fixing frame; 8. Drive device; 9. Low-temperature flue gas inlet; 1 0. Mixed flue gas outlet; 11. External thread section; 12. Limit nut; 13. Cooling chamber; 14. Opening; 15. Hinge; 16. Insulation door; 17. Connecting rod; 18. First hinge; 19. Mounting plate; 20. Mounting groove; 21. Second hinge; 22. Push rod; 23. Slider; 24. Slide groove; 25. Base plate; 26. Spring; 27. Cooling air inlet; 28. Cooling air outlet; 29. ​​Chamber support frame; 30. Clearance groove; 31. External spiral guide plate; 32. Internal spiral guide plate. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0047] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0048] Reference Figures 1 to 4This invention provides a high-temperature venting valve device for RTO (Regenerative Thermal Oxidizer) treatment of VOCs waste gas, comprising a valve body 1. The valve body 1 is the main outer shell of the device, and has three interfaces: a high-temperature flue gas inlet 3, a low-temperature flue gas inlet 9, and a mixed flue gas outlet 10. The high-temperature flue gas inlet 3 is located at the top of the valve body 1 and is used to introduce high-temperature flue gas vented from the RTO furnace; the low-temperature flue gas inlet 9 is located on the side of the valve body 1 and is used to introduce low-temperature air to regulate the temperature of the mixed flue gas; the mixed flue gas outlet 10 is located on the side of the valve body 1 opposite to or adjacent to the low-temperature flue gas inlet 9 and is used to discharge the cooled mixed flue gas from the valve body 1. Preferably, the low-temperature flue gas inlet 9 is positioned at a lower height than the mixed flue gas outlet 10 on the side wall of the valve body 1. Because the density of the low-temperature flue gas is greater than that of the high-temperature flue gas, the low-temperature flue gas forms convective mixing with the high-temperature flue gas during its upward movement, which helps to improve the uniformity of the air mixing.

[0049] The valve body 1 has a cavity inside that accommodates various components. To reduce heat loss and prevent the outer wall temperature of the valve body 1 from becoming too high, an insulation layer (not shown in the figure) is provided on the inner or outer wall of the valve body 1. The insulation layer can be made of high-temperature resistant insulation materials known in the art, such as ceramic fiber cotton or aluminum silicate cotton.

[0050] Reference Figure 2 and Figure 3 Valve seat 2 is located at the high-temperature flue gas inlet 3. Valve seat 2 has a sealing surface that cooperates with the sealing structure of valve plate 4 to achieve a closed seal of high-temperature flue gas inlet 3. Valve seat 2 and valve body 1 are detachably connected, for example by flange connection or bolt connection, so that the entire valve seat 2 can be replaced after the sealing surface is worn, without replacing the entire valve body 1.

[0051] Reference Figure 3 and Figure 4 The valve plate 4 is movably disposed inside the valve body 1, located below the valve seat 2. The valve plate 4 has a sealing structure adapted to the sealing surface of the valve seat 2. The drive mechanism is connected to the valve plate 4 and is used to drive the valve plate 4 to move vertically up and down, thereby switching the valve plate 4 between the closed position and the open position.

[0052] Specifically, refer to Figure 3 and Figure 4 The drive mechanism includes a valve stem 5, a valve stem guide device 6, a drive device mounting bracket 7, and a drive device 8. One end (upper end) of the valve stem 5 is fixedly connected to the valve plate 4, and the other end (lower end) extends from the bottom of the valve body 1. The valve stem 5 extends vertically, and its axis coincides with the central axis of the valve plate 4 to ensure the centering of the valve plate 4 when it rises and falls.

[0053] Reference Figure 3 and Figure 4The valve stem guide device 6 is disposed inside the valve body 1, located in the lower region of the valve body 1. The valve stem guide device 6 can adopt a guide sleeve structure known in the art, which has a groove inside for the valve stem 5 to slide up and down. The valve stem 5 passes through the groove and slides in cooperation with the valve stem guide device 6. The valve stem guide device 6 is fixed to the inner wall of the valve body 1 by a bracket or connecting plate to ensure that the valve stem 5 always remains vertical and does not deviate during the up and down process.

[0054] The drive unit mounting bracket 7 is located at the bottom of the valve body 1. The drive unit mounting bracket 7 can be fixed to the bottom outer wall of the valve body 1 by welding or bolting. The drive unit 8 is mounted on the drive unit mounting bracket 7 and has a lifting movable end, which is fixedly connected to the end of the valve stem 5 away from the valve plate 4 (i.e., the lower end). The drive unit 8 can be any one of a cylinder, hydraulic cylinder, or electric actuator, preferably a cylinder, to utilize the existing compressed air source in the factory and reduce operating costs.

[0055] Reference Figures 5 to 9 As a further improvement of the present invention, the valve plate 4 adopts a modular and detachable structure. The valve plate 4 includes an upper clamping plate 4.1, a lower clamping plate 4.2, and a soft high-temperature resistant material 4.3 disposed between the upper clamping plate 4.1 and the lower clamping plate 4.2. The soft high-temperature resistant material 4.3 has a conical structure and is clamped and fixed by the upper clamping plate 4.1 and the lower clamping plate 4.2. The upper clamping plate 4.1 and the lower clamping plate 4.2 are connected by fastening bolts 4.8 and fastening nuts 4.9, which clamp and fix the soft high-temperature resistant material 4.3 between them.

[0056] The soft, high-temperature resistant material 4.3 is a compressible, high-temperature resistant fiber material, such as ceramic fiber blankets, aluminosilicate fiber blankets, and other well-known high-temperature resistant flexible sealing materials in the art. When the valve plate 4 rises, the soft, high-temperature resistant material 4.3 fits tightly against the hard sealing surface of the valve seat 2, forming a soft-hard combined sealing pair, effectively reducing leakage.

[0057] It is understood that the sealing surface shape of the soft high-temperature resistant material 4.3 is not limited to the aforementioned conical structure. As another alternative embodiment of the present invention, refer to... Figure 7 and Figure 8 The sealing surface of the soft high-temperature resistant material 4.3 can also be made into a stepped structure, that is, the sealing surface is distributed in a multi-level stepped shape along the radial direction. When the stepped sealing surface is matched with the stepped sealing surface of the valve seat 2, each level of the step fits in sequence to form a multi-level seal, which can also achieve a good sealing effect, and can still maintain a certain sealing capacity even when the multi-level sealing surfaces wear down step by step.

[0058] Reference Figure 7 and Figure 8The soft, high-temperature resistant material 4.3 is composed of multiple layers of soft, compressible, high-temperature resistant material monomers 4.31 stacked vertically. High-temperature resistant support plates 4.6 and brackets 4.7 are provided between each layer of soft, high-temperature resistant material monomers 4.31. The support plates 4.6 and brackets 4.7 can be made of stainless steel or heat-resistant alloy, providing structural support for the multi-layered soft material and ensuring the overall rigidity and thickness of the valve plate 4. Support plates 4.6 have bracket grooves 4.61 for accommodating brackets 4.7, which are then positioned by embedding them into the grooves. The diameter of the support plate 4.6 is 15-20 mm smaller than the diameter of the soft, high-temperature resistant material monomers 4.31. This ensures that the valve plate 4 has sufficient rigidity to maintain its overall shape while also guaranteeing sufficient flexibility for the sealing surface to achieve a tight fit with the sealing surface of the valve seat 2.

[0059] Reference Figure 7 and Figure 9 The valve stem 5 and the valve plate 4 are modularly connected through a detachable structure. Specifically, the outer surface of the top end of the valve stem 5 is machined with an external thread section 11, and the valve plate 4 has a through hole that passes through its upper and lower ends. After the external thread section 11 passes through the through hole, the valve plate 4 is clamped and fixed to the valve stem 5 by a lock nut.

[0060] Reference Figure 7 and Figure 9 After the external threaded section 11 passes through the through hole of the valve plate 4, its top end protrudes from the upper surface of the valve plate 4. The protruding part is threadedly connected to the locking nut, clamping and fixing the valve plate 4 to the valve stem 5. The top of the valve plate 4 is also provided with a cap 4.4, which is bolted to the upper clamping plate 4.1 and covers the external threaded section 11 and the locking nut. This not only protects the connection part from direct erosion by high-temperature flue gas, but also prevents the locking nut from loosening due to vibration during use. The bottom of the lower clamping plate 4.2 is provided with a mounting limit plate 4.5. The mounting limit plate 4.5 has a limiting hole for the valve stem 5 to pass through. After the valve stem 5 passes through the limiting hole, its end face abuts against the lower end face of the mounting limit plate 4.5, forming an axial limit.

[0061] With the above modular and detachable design, when the soft high-temperature resistant material 4.3 wears out, the valve plate 4 can be unscrewed from the valve stem 5 as a whole, and the upper clamping plate 4.1 and lower clamping plate 4.2 can be removed to replace the soft high-temperature resistant material 4.3 separately. There is no need to replace the entire valve plate 4 or valve stem 5, which greatly reduces maintenance costs.

[0062] Reference Figures 10 to 16 As a further improvement of the present invention, the device also includes a heat insulation component and a cooling chamber 13 disposed between the high-temperature flue gas inlet 3 and the cooling chamber of the valve plate 4.

[0063] Reference Figure 10 , Figure 11 and Figure 13 The cooling chamber 13 is located inside the valve body 1, below the valve seat 2. The cooling chamber 13 is fixedly mounted to the inner wall of the valve body 1 via a chamber support frame 29. The interior of the cooling chamber 13 forms a cooling cavity to accommodate the valve plate 4 after it is opened. An opening 14 is provided at the upper end of the cooling chamber 13 for the valve plate 4 to enter and exit. The cooling chamber 13 has a cooling air inlet 27 and a cooling air outlet 28, used to introduce cooling air and discharge hot air after heat exchange, respectively. A clearance groove 30 is provided at the bottom of the cooling chamber 13 for the valve stem guide device 6 to pass through, allowing the valve stem 5 and the valve stem guide device 6 to pass through the bottom of the cooling chamber 13 without interfering with it.

[0064] Reference Figure 14 and Figure 16 The heat insulation assembly includes a heat insulation door 16 and a reset mechanism. The heat insulation door 16 is disposed at the opening 14 of the cooling cavity 13. In this embodiment, two heat insulation doors 16 are provided, and the two heat insulation doors 16 are symmetrically rotated and disposed at the edge of the opening 14 by hinges 15. The hinges 15 can be made of high-temperature resistant metal material to ensure long-term reliable operation in high-temperature environments.

[0065] The reset mechanism is connected to the door insulator 16 and is used to automatically reset and close the door insulator 16 after it is pushed open. When the valve plate 4 descends, it first contacts and pushes down on the two door insulators 16, which then flip open to both sides around the hinge 15. The valve plate 4 continues to descend, passing through the opening 14 and entering the cooling chamber 13. After the valve plate 4 is fully inside the cooling chamber 13, the door insulator 16 automatically closes under the action of the reset mechanism, dividing the chamber inside the valve body 1 into an upper mixing chamber and a lower cooling chamber, making the mixing chamber and the cooling chamber disconnected from each other, thus sealing the valve plate 4 in an independent cooling chamber.

[0066] Preferably, refer to Figure 14 and Figure 16 The reset mechanism can be a spring reset mechanism. Specifically, the reset mechanism includes a mounting plate 19, a slide groove 24, a slider 23, a base plate 25, a spring 26, a push rod 22, and a connecting rod 17. The mounting plate 19 has a mounting groove 20 on its surface, which can be fixed to the inner wall of the cooling cavity 13 by screws. The slide groove 24 is fixedly mounted on the mounting plate 19 and extends vertically. The slider 23 is slidably mounted within the slide groove 24. The base plate 25 is fixedly mounted at the bottom end of the slide groove 24. The spring 26 is positioned between the base plate 25 and the slider 23, with its upper end connected to the slider 23 and its lower end connected to the base plate 25. The lower end of the push rod 22 is fixedly connected to the slider 23, and its upper end is movably hinged to the lower end of the connecting rod 17 via a second hinge 21. The upper end of the connecting rod 17 is fixedly connected to the bottom of the door insulation panel 16 via a first hinge 18.

[0067] When the door insulator 16 is pushed open by the valve plate 4, the door insulator 16 flips around the hinge 15, driving the connecting rod 17 downward through the first hinge 18. The lower end of the connecting rod 17 pushes the push rod 22 downward through the second hinge 21. The push rod 22 pushes the slider 23 to slide downward along the slide groove 24 and compresses the spring 26. When the valve plate 4 is fully inside the cooling chamber 13, the door insulator 16 is no longer pushed by the valve plate 4. The spring 26 releases its stored energy, pushing the slider 23 to slide upward along the slide groove 24. The slider 23 drives the door insulator 16 to flip in the opposite direction around the hinge 15 and reset to close.

[0068] It is understood that the reset mechanism is not limited to the spring reset mechanism described above. In other embodiments, the reset mechanism may also adopt reset methods known in the art, such as torsion spring reset, gravity reset, or pneumatic reset.

[0069] Reference Figure 11 , Figure 12 , Figure 14 and Figure 15 The cooling chamber 13 has an annular cavity structure. An annular flow channel is formed between the outer wall of the cooling chamber 13 and the inner wall of the valve body 1. This annular flow channel is used to guide the flow of cooling air and / or low-temperature flue gas.

[0070] The inner wall of the cooling cavity 13 is provided with an inner spiral guide plate 32. The inner spiral guide plate 32 extends along the inner wall of the cooling cavity 13 in a spiral shape to guide the cooling air entering the cooling cavity to flow around the valve plate 4 along a spiral path, so as to prolong the contact time and contact area between the cooling air and the valve plate 4 and enhance the heat exchange effect.

[0071] An outer spiral guide plate 31 is provided on the outer circumferential surface of the cooling cavity 13. The outer spiral guide plate 31 also extends in a spiral shape along the outer wall of the cooling cavity 13, but its spiral direction is set to guide from bottom to top. The outer spiral guide plate 31 is used to guide the low-temperature flue gas to flow from bottom to top along the spiral path, so as to form convection mixing with the high-temperature flue gas discharged downward from the high-temperature flue gas inlet 3 inside the valve body 1, thereby improving the mixing uniformity.

[0072] Reference Figure 11 and Figure 12 The device diverts a stream of cold air from the low-temperature flue gas inlet 9. After passing through a regulating valve and a check valve, the cold air enters the cooling air inlet 27 tangentially, directly reaching the interior of the cooling chamber 13. Once inside the cooling chamber, the cold air flows around the valve plate 4 along a spiral path under the guidance of the inner spiral guide plate 32, providing forced convection cooling to the valve plate 4. The cooled hot air is then discharged from the cooling air outlet 28 through the check valve, mixed with the high-temperature flue gas in the mixing chamber, and finally discharged from the mixed flue gas outlet 10 from the valve body 1.

[0073] Through the above-mentioned cooling cavity structure, the cooling air flows along a spiral path in the cooling cavity, which prolongs the contact time and contact area with the valve plate 4 and improves the cooling efficiency. At the same time, the outer spiral guide plate 31 guides the low-temperature flue gas to spiral upward and form convective mixing with the high-temperature flue gas discharged downward, which improves the mixing uniformity of high and low temperature flue gas in the mixing chamber.

[0074] The following is combined with Figures 1 to 16 The working principle of the device of the present invention will be explained.

[0075] Closed State: When the RTO system is operating normally, the high-temperature flue gas inlet 3 does not need to be opened for venting. The drive device 8 actuates, its lifting end extending upwards, pushing the valve stem 5 to slide upwards along the valve stem guide device 6. The valve stem 5 drives the valve plate 4 upwards, causing the soft, high-temperature resistant material 4.3 on the valve plate 4 to tightly adhere to the sealing surface of the valve seat 2, forming a soft-hard combined sealing pair, thus sealing the high-temperature flue gas inlet 3. At this time, high-temperature flue gas cannot enter the valve body 1.

[0076] Opening Process: When the RTO furnace temperature or pressure exceeds the safety threshold, the high-temperature flue gas inlet 3 needs to be opened for venting. The drive device 8 reverses its action, its lifting movable end retracts downward, pulling the valve stem 5 downward along the valve stem guide device 6. The valve stem 5 drives the valve plate 4 downward. During the descent, the valve plate 4 first contacts and pushes down to open the two insulating doors 16, which then flip open to both sides around the hinge 15. The valve plate 4 continues to descend, passing through the opening 14 and entering the cooling chamber 13. After the valve plate 4 is fully inside the cooling chamber 13, the insulating doors 16 automatically close under the action of the spring 26 of the reset mechanism, sealing the valve plate 4 in an independent cooling chamber, thus physically isolating the valve plate 4 from the high-temperature flue gas inlet 3. At this time, the valve plate 4 is completely separated from the main high-temperature flue gas channel and is located in the low-temperature zone at the bottom of the valve body 1.

[0077] Meanwhile, high-temperature flue gas enters the mixing chamber of valve body 1 from high-temperature flue gas inlet 3. Blocked by the closed insulation door 16, it cannot flow downwards to flush valve plate 4 and instead flows laterally into the mixing chamber. Low-temperature flue gas introduced from low-temperature flue gas inlet 9 enters valve body 1, with one path tangentially entering cooling air inlet 27 via a branch pipe. Guided by the inner spiral guide plate 32, it flows around valve plate 4 along a spiral path, providing forced convection cooling. The cooled hot air is discharged into the mixing chamber through cooling air outlet 28. Simultaneously, another path of low-temperature flue gas, after entering valve body 1, spirals upwards under the guidance of the outer spiral guide plate 31, forming a convective mixture with the high-temperature flue gas discharged downwards from high-temperature flue gas inlet 3 within the mixing chamber. The mixed flue gas is then discharged from valve body 1 through mixed flue gas outlet 10.

[0078] Closing Process: After the venting is complete, the drive device 8 actuates again, extending its lifting end upwards to push the valve stem 5 and lift the valve plate 4 upwards. The valve plate 4 rises from the cooling chamber 13, first contacting and pushing open the two insulation doors 16, then passing through the opening 14 and continuing to rise, ultimately causing the soft, high-temperature resistant material 4.3 of the valve plate 4 to re-seal the sealing surface of the valve seat 2, thus re-sealing the high-temperature flue gas inlet 3. After the valve plate 4 leaves the cooling chamber 13, the insulation doors 16 automatically close under the action of the reset mechanism. At this point, the device returns to the closed state.

[0079] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity. Any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A high-temperature venting valve device for VOCs waste gas treatment, used to internally mix high-temperature flue gas and low-temperature flue gas before discharge, characterized in that, include: The valve body (1) is provided with a high-temperature flue gas inlet (3), a low-temperature flue gas inlet (9) and a mixed flue gas outlet (10). A valve seat (2) with a sealing surface is provided at the high-temperature flue gas inlet (3); A valve plate (4) is disposed inside the valve body (1), and the valve plate (4) has a sealing structure that is adapted to the sealing surface of the valve seat (2); And a drive mechanism for driving the valve plate (4) to move up and down. When it is necessary to close the high temperature flue gas inlet (3), the drive mechanism drives the valve plate (4) to rise up, so that the sealing structure fits and seals with the sealing surface; when it is necessary to open the high temperature flue gas inlet (3), the drive mechanism drives the valve plate (4) to fall down to the low temperature zone at the bottom of the valve body (1), so that the valve plate (4) is separated from the main channel of high temperature flue gas.

2. The RTO high-temperature relief valve device for VOCs waste gas treatment according to claim 1, characterized in that, The drive mechanism includes: Valve stem (5) fixedly connected to the valve plate (4); The valve stem guide device (6) is provided in the valve body (1), and the valve stem guide device (6) has a groove inside for the valve stem (5) to slide up and down; Drive device mounting bracket (7) is located at the bottom of the outside of the valve body (1); And a drive device (8) mounted on the drive device mounting bracket (7), the drive device (8) having a lifting movable end, the movable end being fixedly connected to the other end of the valve stem (5) away from the valve plate (4).

3. The RTO high-temperature relief valve device for VOCs waste gas treatment according to claim 2, characterized in that, The drive device (8) is any one of a cylinder, a hydraulic cylinder or an electric actuator.

4. The RTO high-temperature relief valve device for VOCs waste gas treatment according to claim 3, characterized in that, The valve seat (2) is a replaceable structure, and the valve plate (4) includes: Upper clamping plate (4.1) and lower clamping plate (4.2); And a soft high-temperature resistant material (4.3) disposed between the upper clamping plate (4.1) and the lower clamping plate (4.2), wherein the soft high-temperature resistant material (4.3) is a conical structure or a stepped structure, and is clamped and fixed by the upper clamping plate (4.1) and the lower clamping plate (4.2).

5. The RTO high-temperature relief valve device for VOCs waste gas treatment according to claim 4, characterized in that, The valve stem (5) and the valve plate (4) are detachably modularly connected. The outer surface of the top end of the valve stem (5) is machined with an external thread section (11). The valve plate (4) has a through hole that passes through its upper and lower ends. After the external thread section (11) passes through the through hole, the valve plate (4) is fixed to the valve stem (5) by a locking nut.

6. The RTO high-temperature relief valve device for VOCs waste gas treatment according to claim 5, characterized in that, The valve plate (4) is provided with a cap (4.4) at the top. The cap (4.4) is bolted to the upper clamping plate (4.1) and covers the external thread section (11) and the locking nut. The lower clamping plate (4.2) is provided with a mounting limiting plate (4.5) at the bottom. The mounting limiting plate (4.5) has a limiting hole for the valve stem (5) to pass through. After the valve stem (5) passes through the mounting limiting plate (4.5), its end face abuts against the lower end face of the mounting limiting plate (4.5) to form an axial limit.

7. The RTO high-temperature relief valve device for VOCs waste gas treatment according to claim 6, characterized in that, The soft high-temperature resistant material (4.3) is composed of multiple layers of soft, compressible, soft high-temperature resistant material monomers (4.31), with a high-temperature resistant support plate (4.6) and a bracket (4.7) between each layer. The diameter of the support plate (4.6) is smaller than the diameter of the soft high-temperature resistant material monomer (4.31).

8. The RTO high-temperature relief valve device for VOCs waste gas treatment according to any one of claims 1-7, characterized in that, The device further includes a heat insulation component disposed between the high-temperature flue gas inlet (3) and the cooling chamber of the valve plate (4), the heat insulation component comprising: The door insulator (16) is rotatably connected to the valve body (1) through a rotating shaft structure and is equipped with a reset mechanism. When the valve plate (4) descends, it opens the door insulator (16). After it is in place, the door insulator (16) automatically closes by relying on the reset mechanism and divides the internal chamber of the valve body (1) into an upper mixing chamber and a lower cooling chamber, so that the mixing chamber and the cooling chamber are not connected to each other, thereby sealing the valve plate (4) in an independent cooling chamber.

9. The RTO high-temperature relief valve device for VOCs waste gas treatment according to claim 8, characterized in that, The device further includes: The cooling chamber (13) has a cooling air inlet (27) and a cooling air outlet (28) at its interior. The upper end of the cooling chamber (13) has an opening (14) for the valve plate (4) to enter and exit. Two insulation doors (16) are provided and are symmetrically rotated at the opening (14) by means of hinges (15). The bottom of the cooling chamber (13) has a clearance groove (30) for the valve stem guide device (6) to pass through.

10. The RTO high-temperature relief valve device for VOCs waste gas treatment according to claim 9, characterized in that, The device diverts a stream of cold air from the low-temperature flue gas inlet (9) pipeline, which then enters the cooling air inlet (27) tangentially after passing through the regulating valve and the one-way valve, directly reaching the cooling chamber of the cooling cavity (13). The inner wall of the cooling cavity is provided with an inner spiral guide plate (32) to guide the cold air to flow around the valve plate (4) along the spiral path. The cooled hot air is discharged into the mixing chamber through the one-way valve to mix with the high-temperature flue gas and then discharged from the cooling air outlet (28). The cooling cavity (13) is an annular cavity structure, and its outer wall forms an annular flow channel with the inner wall of the valve body (1). The outer circumferential surface of the cooling cavity (13) is provided with an outer spiral guide plate (31) to guide the low-temperature flue gas to spiral upward so as to form a convective mixture with the high-temperature flue gas discharged downward from the high-temperature flue gas inlet (3).

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