Airflow switching valve device applied to RTO system

Abstract

The utility model relates to the technical field of industrial waste gas treatment, in particular to an airflow switching valve device applied to an RTO system, which comprises a valve body, a valve plate and a valve seat, and is characterized in that the valve plate and the valve seat are mounted in the valve body, and one surface, attached to the valve seat, of the valve plate is a sealing surface; a multi-layer composite sealing structure is arranged on the sealing surface of the valve plate and the valve seat; a cleaning brush assembly is further arranged on the edge of the valve seat sealing face and makes contact with the valve plate sealing face. Through the combination of the multi-layer composite sealing structure and the cleaning brush assembly, impurities and particles are effectively prevented from being attached to the sealing face, the sealing performance is greatly improved, gas leakage is remarkably reduced, and therefore the waste gas treatment efficiency and the purification effect of an RTO system are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to industrial waste gas treatment technical field especially is applied to a gas flow switching valve device for RTO system. BACKGROUND

[0002] In the environmental protection treatment of medium and high concentration waste gas VOCs, the regenerative thermal oxidizer (RTO) is a high-efficiency purification organic waste gas treatment equipment, and its basic principle is to heat the organic waste gas to above 760 degrees Celsius, so that the VOCs in the waste gas are oxidized and decomposed into carbon dioxide and water. The flue gas after combustion accumulates heat in the ceramic by the regenerative ceramic brick, preheats the organic waste gas, and then discharges. The inlet and outlet directions of the waste gas are automatically switched by the switching valve, and the system works in a cycle. RTO can fully recover the heat energy of the organic decomposition by combustion, greatly reducing the energy consumption of the system.

[0003] In the RTO system, the gas flow switching valve plays a crucial role in controlling the flow direction of waste gas and purified gas. However, the existing gas flow switching valve faces many problems during long-term operation. The waste gas usually contains various impurities and particulate matter, which will gradually adhere to the sealing surface of the valve plate and valve seat, causing the sealing performance to decline, and then causing gas leakage, affecting the waste gas treatment efficiency and purification effect of the RTO system. At the same time, the accumulation of impurities and particulate matter will cause the valve plate to jam during switching, not only reducing the response speed of the switching valve, but also possibly causing additional load to the driving mechanism, shortening the service life of the equipment. In addition, the traditional switching valve lacks effective self-cleaning and anti-fouling measures, and needs to be frequently disassembled, cleaned and maintained manually, increasing the operation and maintenance cost and downtime, seriously affecting the stable operation of the RTO system. SUMMARY

[0004] To solve the technical defects proposed in the background art, the purpose of the utility model is to provide a gas flow switching valve device applied to an RTO system, to solve the problems of sealing performance decline and action jam caused by the adhesion of impurities and particulate matter in waste gas during long-term operation of the switching valve, improve the reliability and stability of the switching valve, reduce the operation and maintenance cost, and prolong the service life of the equipment.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The air flow switching valve device applied to the RTO system comprises a valve body, a valve plate and a valve seat, the valve plate and the valve seat are installed in the valve body, one side of the valve plate and the valve seat is a sealing surface, and the sealing surface of the valve plate and the valve seat is provided with a multilayer composite sealing structure; the multilayer composite sealing structure comprises a high-temperature-resistant graphite sealing ring in the innermost layer, a metal bellows in the middle layer and a fluororubber sealing gasket in the outer layer, the high-temperature-resistant graphite sealing ring is tightly attached to the inner side of the sealing surface of the valve plate and the valve seat, the metal bellows is sleeved on the outer side of the high-temperature-resistant graphite sealing ring, and the fluororubber sealing gasket is arranged on the outer side of the metal bellows and is in close contact with the valve plate and the valve seat; a cleaning brush assembly is further arranged on the edge of the sealing surface of the valve seat, and the cleaning brush assembly is in contact with the sealing surface of the valve plate.

[0007] Preferably, the cleaning brush assembly comprises a high-temperature-resistant nylon base and carbon fiber bristles embedded on the base, one end of the base is a fixed end, the other end is a free end, the fixed end of the base is fixedly connected to the edge of the sealing surface of the valve seat, and the movable end of the base is provided with a semispherical wear-resistant head, and the wear-resistant head extends into the contact surface of the valve seat and the valve plate.

[0008] Preferably, a plurality of arc-shaped flow guide grooves are arranged on the edge of the sealing surface of the valve plate, the flow guide grooves are communicated with the inner cavity of the valve body, and the cross section of the flow guide grooves is in the shape of a trapezoid with the upper part being wide and the lower part being narrow.

[0009] Preferably, the sealing surface of the valve plate and the valve seat is further covered with a nanoscale hydrophobic and oleophobic functional coating.

[0010] Preferably, the valve body is provided with an air inlet and an air outlet, the air inlet and the air outlet are located on the two sides of the valve seat respectively, and flanges are connected to the air inlet and the air outlet.

[0011] Preferably, the valve body is provided with an air inlet and an air outlet, the air inlet and the air outlet are located on the two sides of the valve seat respectively, and flanges are connected to the air inlet and the air outlet.

[0012] Preferably, the valve plate is rotatably installed in the valve body through a pin shaft, and the valve plate can be rotated to different positions under the action of the driving mechanism, so as to control the air flow communication state between the air inlet and the air outlet.

[0013] Preferably, the valve seat is in the shape of a circular ring, the axis of the valve seat and the valve plate is located on the same axis, the valve seat is fixedly installed in the valve body at a position opposite to the valve plate, and the valve seat and the valve body are connected in a sealed welding or sealing glue sealing mode.

[0014] In summary, the beneficial effects of the present application are as follows:

[0015] The utility model discloses a multilayer composite sealing mechanism and cleaning brush assembly are set up on the sealing surface between valve plate and valve seat, utilize the combination of high temperature resistance graphite seal ring, metal bellows seal and fluorine rubber sealing pad, and the use of high temperature resistance, high strength alloy material makes switching valve can adapt to the high temperature of RTO system, complex chemical environment, ensure that can stably run under various working conditions, and through the self -cleaning effect of cleaning brush assembly, can remove the impurity on the sealing surface in time, avoids the valve plate action jam phenomenon, makes valve plate can carry out switching action fast, stably, improves switching valve's response speed, and effectively prevents the attachment of impurity and particulate matter on the sealing surface, greatly improves the sealing performance, significantly reduces gas leakage, and reduces the frequency of manual dismounting and cleaning and maintenance, reduces operation and maintenance cost and downtime, thereby improves the exhaust gas treatment efficiency and purification effect of RTO system. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the structure schematic diagram of airflow switching valve device of the utility model for RTO system;

[0017] Figure 2 It is the front view of airflow switching valve device of the utility model for RTO system;

[0018] Figure 3 It is the sectional view of airflow switching valve device of the utility model for RTO system;

[0019] Figure 4 It is Figure 3 The enlarged view of multilayer composite sealing structure and cleaning brush assembly in a.

[0020] Explanation of reference numerals in the drawing:

[0021] 1, valve body;11, air inlet;12, air outlet;13, flange plate;2, valve plate;3, valve seat;4, composite sealing structure;41, graphite seal ring;42, metal bellows;43, fluorine rubber sealing pad;5, cleaning brush assembly;51, nylon base body;52, carbon fiber brush hair;53, wear -resistant head;6, flow guide groove;7, drive mechanism;71, transmission part;8, pin shaft. DETAILED DESCRIPTION

[0022] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art belong to the scope of protection of the utility model.

[0023] Those skilled in the art should understand that in the disclosure of the utility model, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore the above terms cannot be understood as a limitation on the utility model.

[0024] In the description of the utility model, if there is a word such as "several" description, its meaning is one or more, the meaning of multiple is two and more, greater than, less than, more than and the like are not included in the number, above, below, within and the like are understood as including the number. If the first, second, third is described, it is only used for distinguishing technical features for the purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0025] The following will be described in detail in combination with the accompanying drawings Figures 1-4 The embodiment of the utility model discloses a kind of airflow switching valve devices applied to RTO system is further detailed.

[0026] A kind of airflow switching valve device applied to RTO system, as shown in Figure 3 , 4 Sealing surface of valve plate 2 and valve seat 3 is provided with multilayer composite sealing structure 4;Multilayer composite sealing structure 4 includes the innermost high-temperature-resistant graphite sealing ring 41 of intermediate layer, metal bellows 42 and outer fluorine rubber sealing pad 43, high-temperature-resistant graphite sealing ring 41 is closely attached to the inner side of the sealing surface of valve plate 2 and valve seat 3;Metal bellows 42 is sleeved on the outer side of high-temperature-resistant graphite sealing ring 41;Fluorine rubber sealing pad 43 is arranged on the outer side of metal bellows 42, and is closely contacted with valve plate 2 and valve seat 3;Edge of the sealing surface of valve seat 3 is also provided with cleaning brush assembly 5, and cleaning brush assembly 5 is in contact with the sealing surface of valve plate 2.

[0027] Specifically, the three-layer composite sealing structure 4 is adopted, from inside to outside, in turn, the high-temperature-resistant graphite sealing ring 41, the metal corrugated pipe 42 and the fluororubber sealing gasket 43; the innermost high-temperature-resistant graphite sealing ring 41 utilizes the good high-temperature resistance and self-lubricating properties of graphite to maintain stable sealing performance in a high-temperature environment, effectively preventing the erosion of high-temperature exhaust gas on the sealing material, and its self-lubricating property can reduce the friction between the valve plate 2 and the valve seat 3. The middle layer of the metal corrugated pipe 42 has good elasticity and fatigue resistance, and can compensate for the slight displacement between the valve plate 2 and the valve seat 3 due to thermal expansion and contraction through elastic deformation, preventing sealing failure caused by thermal stress, further enhancing the sealing effect and ensuring good sealing state when the temperature changes. The outer layer of the fluororubber sealing gasket 43 can resist the corrosion of various chemicals in the exhaust gas due to its excellent chemical corrosion resistance and aging resistance, ensuring the sealing reliability under complex working conditions, providing elastic sealing (compression amount 10-12%) in the normal temperature section, and adapting to the micro-unevenness of the surface of the valve seat 3; and effectively preventing the destruction of the internal sealing structure by chemicals.

[0028] In the present embodiment, as shown in Figure 4 The cleaning brush assembly 5 includes a high-temperature-resistant nylon base 51 and carbon fiber bristles 52 embedded in the base. One end of the base is a fixed end, and the other end is a free end. The fixed end of the base is fixed to the edge of the sealing surface of the valve seat 3, and the movable end of the base is provided with a hemispherical wear-resistant head 53 that extends into the contact surface between the valve seat 3 and the valve plate 2.

[0029] Specifically, the cleaning brush is made of high-strength and corrosion-resistant nylon bristles, which are fixed to the edge of the valve seat 3. The length of the bristles is carefully designed to be just right to contact the sealing surface of the valve plate 2 when the switch valve is in operation. After the gas flow guided by the flow guide groove 6 performs preliminary flushing on the sealing surface, the cleaning brush will further remove any impurities that may be left, ensuring that the sealing surface remains clean and maintains good sealing performance. When the valve plate 2 rotates, the carbon fiber bristles 52 on the nylon base 51 can remove hard particles and use the hemispherical wear-resistant head 53 on the free end to scrape stubborn particles embedded in the sealing surface. The high-frequency vibration of the carbon fiber bristles 52 can also effectively reduce the roughness of the sealing surface, solving the problem of sealing performance degradation and operation jam caused by the attachment of impurities and particles in the exhaust gas during the long-term operation of the switch valve, thereby improving the reliability and stability of the switch valve, reducing the operation and maintenance cost, and prolonging the service life of the equipment.

[0030] In the present embodiment, as shown in Figure 3 The edge of the sealing surface of the valve plate 2 is provided with a plurality of arc-shaped flow guide grooves 6, which are connected to the inner cavity of the valve body 1, and the cross section of the flow guide groove 6 is in the shape of a trapezoid with the upper part wider and the lower part narrower.

[0031] Specifically, in the intelligent air flow switching valve device, the guide groove 6 is designed on the sealing surface edge of the valve plate 2. Its main role is reflected in: when the gas flows through the valve plate 2, the guide groove can guide the airflow to form a specific scouring angle, effectively impacting the impurities on the sealing surface. For example, in the waste gas treatment process, impurities and particulate matter carried in the waste gas are easy to adhere to the sealing surface of the valve plate 2, affecting the sealing performance. The airflow guided by the guide groove 6 can scour these impurities and carry them away from the sealing surface, thereby reducing the accumulation of impurities and ensuring the sealing performance of the valve plate 2 and the valve seat 3, maintaining the normal operation of the system. At the same time, the trapezoidal cross-section design of the guide groove (wide at the top and narrow at the bottom) not only ensures enough space for the airflow to pass through, but also enhances the scouring effect of the airflow.

[0032] In order to further improve the sealing effect of the sealing surface of the valve plate 2 and the valve seat 3, a nanoscale hydrophobic and oleophobic functional coating is also covered on the sealing surface of the valve plate 2 and the valve seat 3. By using nanoscale superhydrophobic and superoleophobic coating technology to treat the sealing surface of the valve plate 2 and the valve seat 3, the sealing surface has extremely low surface energy. This extremely low surface energy characteristic makes it difficult for impurities and particulate matter in the waste gas to adhere to the sealing surface, fundamentally reducing the influence of impurities and particulate matter on the sealing performance and the action of the valve plate 2.

[0033] In this embodiment, as shown in Figure 1 , the valve body 1 is provided with an air inlet 11 and an air outlet 12, the air inlet 11 and the air outlet 12 are located on both sides of the valve seat 3, and the air inlet 11 and the air outlet 12 are both connected with flanges 13.

[0034] Specifically, the air inlet 11 is connected with the waste gas inlet through the flange 13 for introducing waste gas; the air outlet 12 is connected with the waste gas outlet through the flange 13 for discharging treated waste gas; wherein, when the valve plate 2 is rotated to a specific position, the air inlet 11 and the air outlet 12 are communicated, realizing the switching of airflow; when the valve plate 2 is rotated to other positions, the communication between the air inlet 11 and the air outlet 12 is cut off, preventing the airflow from passing through.

[0035] In this embodiment, as shown in Figure 1 , 2 , it also includes a driving mechanism 7, the driving mechanism 7 is installed outside the valve body 1, and the driving assembly is connected with the valve plate 2 through a transmission component 71; the transmission component 71 is a transmission shaft or a transmission chain.

[0036] Specifically, the device further comprises a driving mechanism 7 for driving the valve plate 2 to switch relative to the valve seat 3, wherein the driving mechanism 7 can be selected as an electric driving mechanism 7 or a hydraulic driving mechanism 7 according to actual needs. The electric driving mechanism 7 has the advantages of fast response speed and high control precision, and can realize fast and accurate switching of the valve plate 2. The hydraulic driving mechanism 7 has the characteristics of large output force and stable operation, and is suitable for occasions with high switching force requirements. By reasonably selecting the driving mechanism 7, the switching valve can stably and reliably operate under different working conditions.

[0037] In the embodiment, the valve plate 2 is rotatably installed in the valve body 1 through a pin shaft 8, and can be rotated to different positions under the action of the driving mechanism 7 to control the communication state of the air flow between the air inlet 11 and the air outlet 12.

[0038] Specifically, the driving mechanism 7 drives the valve plate 2 to rotate around the pin shaft 8, switch to a predetermined angle (usually 90° or 120°), change the air flow channel, and realize the opening or closing state:

[0039] Open state: the valve plate 2 is rotated to make the air inlet 11 communicate with a certain heat storage chamber, the exhaust gas enters the heat storage body for preheating, and the purified gas is discharged from another heat storage chamber through the air outlet 12.

[0040] Closed state: the sealing surface of the valve plate 2 tightly abuts against the valve seat 3, and the current air flow channel is blocked, preparing to switch to the next cycle.

[0041] In the embodiment, the valve seat 3 is in a circular ring shape, and the axis of the valve seat 3 and the valve plate 2 are located on the same axis. The valve seat 3 is fixedly installed in the valve body 1 opposite to the valve plate 2, and is sealed and connected between the valve seat 3 and the valve body 1 by sealing welding or sealing glue.

[0042] Specifically, the valve plate 2 and the valve seat 3 are made of high-temperature-resistant and high-strength alloy materials, so that in the high-temperature environment of the RTO system, the valve plate 2 and the valve seat 3 can maintain good mechanical properties and will not be deformed or damaged due to high temperature, thereby ensuring the normal operation and sealing performance of the switching valve. Meanwhile, taking the circular valve plate 2 and the ring-shaped valve seat 3 as an example, the inner diameter of the valve seat 3 matches the diameter of the valve plate 2. When the valve plate 2 is rotated to the closed position, the edge of the valve plate 2 tightly abuts against the sealing surface of the valve seat 3 to block the air flow. When switched to the open position, the air flow can smoothly pass through the channel formed between the valve plate 2 and the valve seat 3. If a square valve plate 2 and a frame-shaped valve seat 3 are selected, the side length and sealing edge of the valve plate 2 are accurately matched with the sealing surface of the valve seat 3, so as to ensure the sealing performance and smoothness during air flow switching. This accurate position and geometric relationship design effectively improves the stability and reliability of air flow switching in the exhaust gas treatment system.

[0043] The working principle of the utility model discloses:

[0044] The exhaust gas first enters the system through the intake module, and in the intake process, the exhaust gas will pass through a series of pretreatments such as preliminary filtration, etc.; then, the exhaust gas enters the area provided with the high-efficiency mixing device under the action of the switching valve, and is mixed with air here; then, the mixed gas enters the combustion chamber, and is burned at high temperature in the combustion chamber to realize exhaust gas purification; the high-temperature purified gas after combustion enters the heat storage module, releases heat through the heat storage body, preheats the subsequently entering exhaust gas, and after the temperature of itself is reduced, is discharged from the system through the exhaust module; wherein, the access and discharge of the exhaust gas need to pass through the switching valve for control, and the switching valve automatically adjusts its opening and closing state according to the production situation, when it is needed to conduct the gas flow, the switching valve is in the open state, the driving mechanism 7 drives the valve plate 2 to rotate around the pin shaft 8, so that the valve plate 2 leaves the sealing surface of the valve seat 3, at this time, the flow guide groove 6 on the valve plate 2 is aligned with the inlet and outlet gas ports 12 on the valve body 1, and the exhaust gas can be guided along the flow guide groove 6 and smoothly flow from the inlet gas port 11 to the outlet gas port 12. When it is needed to cut off the gas flow, the switching valve is in the closed state, the driving mechanism 7 drives the valve plate 2 to rotate back to the initial position, the edge of the valve plate 2 is tightly attached to the sealing surface of the valve seat 3. And under the action of the multi-layer composite sealing structure 4 on the sealing surface, the gas leakage is effectively prevented. At the same time, the cleaning brush on the edge of the valve plate 2 will clean the sealing surface of the valve seat 3 during the rotation of the valve plate 2, and the impurities and particles attached to the sealing surface are brushed off, so as to prevent them from affecting the sealing effect and ensure the long-term stable sealing of the sealing surface.

[0045] The embodiments of the specific embodiment are the preferred embodiments of the present application, and are not limited to the protection scope of the present application, wherein the same parts are indicated by the same reference numerals. Therefore: any equivalent changes made according to the structure, shape, principle of the present application should be covered in the protection scope of the present application.

Claims

1. A gas flow switching valve device for use in an RTO system, comprising a valve body, a valve plate, and a valve seat, characterized in that, The valve plate and valve seat are installed in the valve body, and the side of the valve plate that is in contact with the valve seat is the sealing surface. The sealing surface of the valve plate and valve seat is provided with a multi-layer composite sealing structure. The multi-layer composite sealing structure includes an innermost high-temperature resistant graphite sealing ring, a middle layer of metal bellows, and an outer layer of fluororubber sealing gasket. The high-temperature resistant graphite sealing ring is tightly fitted to the inner side of the sealing surface of the valve plate and valve seat. The metal bellows is sleeved on the outer side of the high-temperature resistant graphite sealing ring. The fluororubber sealing gasket is located on the outer side of the metal bellows and is in close contact with the valve plate and valve seat. A cleaning brush assembly is also provided at the edge of the valve seat sealing surface, and the cleaning brush assembly is in contact with the valve plate sealing surface.

2. The airflow switching valve device for an RTO system according to claim 1, characterized in that, The cleaning brush assembly includes a high-temperature resistant nylon substrate and carbon fiber bristles embedded in the substrate. One end of the substrate is a fixed end and the other end is a free end. The fixed end of the substrate is fixed to the edge of the sealing surface of the valve seat, and the movable end of the substrate is provided with a hemispherical wear-resistant head that extends into the contact surface between the valve seat and the valve plate.

3. The airflow switching valve device for an RTO system according to claim 2, characterized in that, The valve plate has multiple arc-shaped guide grooves on its sealing surface edge. The guide grooves are connected to the inner cavity of the valve body, and the cross-section of the guide grooves is a trapezoidal structure that is wider at the top and narrower at the bottom.

4. The airflow switching valve device for an RTO system according to claim 3, characterized in that, The sealing surfaces of the valve plate and valve seat are also covered with a nano-level hydrophobic and oleophobic coating.

5. The airflow switching valve device for an RTO system according to claim 4, characterized in that, The valve body is provided with an air inlet and an air outlet, which are located on both sides of the valve seat, and both the air inlet and the air outlet are connected to a flange.

6. The airflow switching valve device for an RTO system according to claim 5, characterized in that, It also includes a drive mechanism, which is installed on the outside of the valve body and the drive assembly is connected to the valve plate through a transmission component; the transmission component is a drive shaft or a drive chain.

7. The airflow switching valve device for an RTO system according to claim 6, characterized in that, The valve plate is rotatably mounted in the valve body via a pin, and the valve plate can be rotated to different positions under the action of the drive mechanism to control the airflow connection between the air inlet and the air outlet.

8. The airflow switching valve device for an RTO system according to claim 7, characterized in that, The valve seat is circular in shape, and the valve seat and the valve plate are on the same axis. The valve seat is fixedly installed in the valve body at a position opposite to the valve plate, and the valve seat and the valve body are connected by sealing welding or sealing glue.

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