Heat recovery equipment for drying room of tentering setting machine

Abstract

The invention discloses heat recovery equipment for a drying room of a tentering setting machine, which comprises an exhaust pipeline connected to the drying room and used for exhausting waste gas, a heat exchanger is connected to the exhaust pipeline, a combustion chamber is arranged on the exhaust pipeline and located at the upstream of the heat exchanger, an ignition head used for ignition is arranged in the combustion chamber, and the ignition head is connected with the heat exchanger. Waste gas in the drying room enters the combustion chamber through an exhaust pipeline, and the ignition head ignites the waste gas; according to the heat recovery equipment for the stentering setting machine drying room, the combustion chamber is arranged, after waste gas in the drying room is exhausted into the combustion chamber, tail gas in the combustion chamber is ignited through the ignition head, grease and fiber fine velvet in the tail gas are ignited, and the grease and the fiber fine velvet in the tail gas are eliminated through combustion; and the situation that the grease and the fiber fine velvet form scale on the inner wall of the heat exchanger, and the heat exchange efficiency of the heat exchanger is affected is avoided.

Description

Technical Field

[0001] The invention relates to the field of burners, and in particular to heat recovery equipment for a drying room of a stenter setting machine. Background Art

[0002] A stentering machine is a crucial piece of equipment in the textile finishing process. It's primarily used for stretching and setting fabrics, controlling parameters like width, length, and temperature to ensure the desired dimensional stability and appearance. Existing stentering machines typically have a drying chamber consisting of multiple heating zones, equipped with a hot air circulation system and temperature control system to ensure uniform heating of the fabric at high temperatures. After stenting, the fabric enters the drying chamber, where it is set and dried at high temperatures. The exhaust gas from the drying chamber contains a significant amount of heat energy, which is typically recovered to avoid energy waste.

[0003] For example, patent publication number CN2071246U, published on September 10, 2019, discloses a heat recovery system within the drying room of a stenter setting machine. The system comprises a cylindrical combustion chamber, a gas inlet pipe, a gas fan, a gas mixing chamber, an ignition head, an air pipe, an air valve, an air fan, and a gas mixing plate. The gas inlet pipe is connected to the gas fan inlet, the gas fan outlet is connected to the gas mixing chamber, and the gas mixing chamber is connected to the ignition head. The air pipe comprises three sections: an intake section, a heating section, and an exhaust section. The air fan is connected to the intake section, and an air valve is provided on the intake section to control the amount of cold air entering the air pipe. The heating section is a spiral pipe section surrounding the combustion chamber, and the exhaust section is connected to the gas mixing chamber, where heated air is introduced into the gas mixing chamber for mixing with the gas. The gas mixing chamber is equipped with two mutually perpendicular gas mixing plates with multiple circular holes evenly distributed on the gas mixing plates. The heating section of the air pipe can also be a cylindrical straight pipe surrounding the combustion chamber. This improves uneven temperature distribution in the oven and ensures more complete combustion.

[0004] During the high-temperature treatment of fabrics in the drying room, the spinning oil on the fabrics evaporates under the high temperature in the drying room to form oil mist, and the fabrics will also produce fiber lint during the high-temperature treatment process. The generated oil mist and fiber lint are usually discharged outside the drying room along with the exhaust gas. When the existing exhaust gas is heat-recovered, the exhaust gas is usually directly passed through the heat exchanger to preheat the new air through heat exchange. When the exhaust gas with grease is passed into the heat exchanger, the grease and fiber lint are likely to form scale on the inner wall of the heat exchanger, affecting the heat exchange efficiency of the heat exchanger. Summary of the Invention

[0005] The object of the present invention is to provide a heat recovery device for a stenter drying room to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions: A heat recovery device for a stenter setting machine drying room, comprising an exhaust pipe connected to the drying room for discharging exhaust gas, wherein a heat exchanger is connected to the exhaust pipe. The device is characterized in that a combustion chamber is provided on the exhaust pipe upstream of the heat exchanger, and an ignition head for ignition is provided in the combustion chamber. The exhaust gas in the drying room enters the combustion chamber through the exhaust pipe, and the ignition head ignites the exhaust gas.

[0007] As mentioned above, the combustion chamber is further provided with an oil injection mechanism, which intermittently injects fuel into the combustion chamber.

[0008] As mentioned above, an interception net is also provided in the combustion chamber, and the interception net is made of refractory material.

[0009] As mentioned above, a plurality of first slide grooves are arranged in parallel on the inner wall of the combustion chamber, a plurality of sliding columns are provided on the edge of a tensioning frame, and the plurality of sliding columns are slidably connected in the plurality of first slide grooves one by one. The tensioning frame and the first slide grooves are also connected by a plurality of first springs. The outer diameter of the tensioning frame is adapted to the inner diameter of the combustion chamber, and the intercepting net is located in and fills the inner diameter area of ​​the tensioning frame.

[0010] As mentioned above, there are multiple tensioning frames, and the multiple tensioning frames are arranged at intervals along the axial direction of the combustion chamber. The aperture of the mesh of the multi-layer intercepting net gradually becomes smaller along the conveying direction away from the exhaust gas.

[0011] As mentioned above, the intercepting net is detachably connected to the inner diameter of the tensioning frame.

[0012] As mentioned above, a plurality of second slide grooves are also provided in parallel on the inner wall of the combustion chamber, and the tensioning frame away from the exhaust pipe is slidably installed in the second slide groove. The second slide groove and the corresponding tensioning frame are connected by a second spring, and the spring constant of the first spring is smaller than the spring constant of the second spring.

[0013] As mentioned above, the intercepting net and the tensioning frame are rotationally connected via a first rotating shaft, and the first rotating shaft and the tensioning frame are connected via a torsion spring.

[0014] As mentioned above, a push rod is fixedly installed on one end of the combustion chamber away from the exhaust pipe, and the push rod is facing the side of the interception net on the tensioning frame away from the exhaust pipe. Based on the squeezing of the push rod, the interception net rotates around the first rotating shaft.

[0015] As mentioned above, the bottom of the combustion chamber is provided with an openable and closable opening.

[0016] The beneficial effect of the present invention is that: in the above technical solution, the present invention provides a heat recovery device for the drying room of a stenter setting machine, which is provided with a combustion chamber. When the exhaust gas in the drying room is discharged into the combustion chamber, the exhaust gas in the combustion chamber is ignited by the ignition head, and the grease and fiber fines in the exhaust gas are ignited. The grease and fiber fines in the exhaust gas are eliminated by combustion, thereby preventing the grease and fiber fines from forming scale on the inner wall of the subsequent heat exchanger, thereby affecting the heat exchange efficiency of the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 A schematic structural diagram of a heat recovery device for a stenter drying room provided by an embodiment of the present invention; Figure 2 A schematic diagram of the internal structure of a combustion chamber when the interception net provided in an embodiment of the present invention is fixedly installed; Figure 3 A schematic diagram of the internal structure of a combustion chamber when the interception net provided by an embodiment of the present invention is in a movable configuration; Figure 4 A schematic diagram of the internal structure of a combustion chamber when multiple interception nets are provided in an embodiment of the present invention; Figure 5 An exploded schematic diagram of a tensioning frame and an intercepting net provided in an embodiment of the present invention; Figure 6 A schematic diagram of a state where the ejector rod provided in an embodiment of the present invention is located in a combustion chamber.

[0019] Description of reference numerals: Drying room; 2. Exhaust duct; 21. Solenoid valve; 3. Combustion chamber; 4. Ignition head; 5. Heat exchanger; 6. Oil injection mechanism; 7. Intercepting net; 8. First slide; 9. Tensioning frame; 10. First spring; 11. Second slide; 12. Second spring; 13. First rotating shaft; 14. Push rod. DETAILED DESCRIPTION

[0020] In order to make those skilled in the art better understand the technical solution of the present invention, Figure 1-6 , the present invention is further introduced in detail.

[0021] An embodiment of the present invention provides a heat recovery device for a stenter setting machine drying room, comprising an exhaust pipe 2 connected to the drying room 1 for discharging exhaust gas, and a heat exchanger 5 is connected to the exhaust pipe 2. It is characterized in that a combustion chamber 3 is provided on the exhaust pipe 2 upstream of the heat exchanger 5, and an ignition head 4 for ignition is provided in the combustion chamber 3. The exhaust gas in the drying room 1 enters the combustion chamber 3 through the exhaust pipe 2, and the ignition head 4 ignites the exhaust gas.

[0022] Specifically, the drying room 1 is generally in the shape of a rectangular box in the prior art. A passage is provided on the drying room 1 for the textiles to pass through. A hot air circulation system (usually composed of a fan, an air duct and an air nozzle), a heating system and a temperature control system are provided in the drying room 1. The exhaust duct 2 is connected to the interior of the drying room 1. When the drying room 1 performs drying and shaping treatment on the textiles, as the textiles pass through the drying room 1, the heating system in the drying room 1 provides a heat source for the drying room, so that the air in the drying room reaches the required high temperature to dry and shape the textiles (common heating Heating methods include electric heating, fuel heating, gas heating and steam heating, etc.), and then the fan transports the heated hot air through the air duct to the air spray pipe, and then evenly sprays it onto the surface of the fabric to achieve drying and shaping of the fabric. After that, the waste gas generated is discharged to the heat exchanger 5 outside the drying room 1 through the exhaust duct 2 (the heat exchanger 5 can be a heat pipe heat exchanger, a shell and tube heat exchanger, or a plate heat exchanger). Through heat exchange, the heat of the waste gas is used to preheat the air about to enter the drying room 1, thereby achieving heat recovery treatment of the waste gas discharged from the drying room 1.

[0023] The shortcomings of the existing technology are: in the process of pre-treatment of the fabric (such as dyeing, padding, etc.), auxiliary agents such as softeners and anti-wrinkle agents are used. These auxiliary agents evaporate at the high temperature in the drying room to form oil mist, and the fabric will also produce fiber lint during the high-temperature treatment process. The generated oil mist and fiber lint are usually discharged outside the drying room along with the exhaust gas. When the exhaust gas containing oil mist and fiber lint enters the heat exchanger 5, when the exhaust gas passes through the heat exchanger 5, the temperature drops and the oil will condense into liquid; these liquid oil mists will adhere to the surface of the heat exchanger 5, gradually accumulate to form oil stains, and when the fiber lint passes through the oil stain area, it will also adhere to the oil stain area to form scale, affecting the heat exchange efficiency of the heat exchanger 5.

[0024] In this embodiment, one end of the exhaust duct 2 is connected to the drying room 1, and the other end of the exhaust duct 2 is connected to the combustion chamber 3. The combustion chamber 3 is in a rectangular box state. There is an inner cavity inside the combustion chamber 3, and the inner cavity is the combustion area of ​​the exhaust gas. An ignition head 4 is provided in the combustion chamber 3 (in the absence of other combustion aids, the ignition head 4 can be a structure that directly sprays open flames such as a flamethrower, relying on open flames to burn oil and fiber. In the following text, when there are other combustion aids such as oil or oil and fiber that can be enriched and ignited directly, the ignition head 4 can be an electric spark igniter, a hot surface igniter, a flame propagation igniter, a high-frequency igniter, etc. In this embodiment, an electric spark igniter is preferably used). The combustion chamber 3 is away from one end of the exhaust duct 2. The end is connected to the heat exchanger 5 through a pipe. After the exhaust gas in the drying room 1 enters the inner cavity of the combustion chamber 3 through the exhaust pipe 2, the ignition head 4 ignites, so that the exhaust gas entering the combustion chamber 3 is burned, so that the fiber fluff and oil in the exhaust gas are fully burned, to prevent the subsequent exhaust gas from entering the heat exchanger 5, and the oil and fiber in the exhaust gas from forming scale on the surface of the heat exchanger 5, affecting the heat exchange efficiency of the heat exchanger 5. In addition, before the exhaust gas enters the heat exchanger 5, it is ignited in the combustion chamber 3. Compared with the exhaust gas directly drawn out from the drying room 1, the temperature of the exhaust gas after combustion will be further increased. When it subsequently enters the heat exchanger 5 for heat exchange treatment, the exhaust gas with a higher temperature has a better heat exchange effect.

[0025] The products after combustion of waste gas, fiber, etc. are basically carbon oxides, sulfur oxides, nitrogen oxides, etc. and a small amount of dust, which can be discharged through gas or treated by subsequent tail gas treatment equipment. The negative impact on the heat exchanger 5 is far less than that of oil, fiber, etc.

[0026] It should be noted that when the exhaust gas discharged from the drying room 1 is ignited in the combustion chamber 3, in order to prevent the flame generated by the ignition from affecting the textiles in the drying room 1, a solenoid valve 21 can be provided at the connection between the drying room 1 and the exhaust duct 2. When it is necessary to ignite the exhaust gas in the combustion chamber 3, the solenoid valve 21 is closed to separate the combustion chamber 3 from the exhaust duct 2, thereby preventing the flame in the combustion chamber 3 from affecting the textiles in the drying room 1.

[0027] As described above, it is obvious that the fiber and oil content in the exhaust gas entering the combustion chamber 3 may be relatively low, and the exhaust gas may not be ignited by ordinary ignition. Preferably, an injection mechanism 6 is also provided on the combustion chamber 3, and the injection mechanism 6 intermittently injects fuel into the combustion chamber 3.

[0028] Specifically, the fuel injection mechanism 6 consists of a fuel tank, a fuel injection pump and a nozzle. The fuel tank is installed on the outer wall of the combustion chamber 3. The nozzle is installed on the fuel tank, and the nozzle is located inside the combustion chamber 3. A fuel injection pump is provided in the fuel tank. The fuel injection pump is driven by a motor to extract the fuel from the fuel tank and pressurize it, and then transport it to the nozzle. The fuel is sprayed into the combustion chamber 3 through the nozzle and mixed with the exhaust gas entering the combustion chamber 3 through the exhaust pipe 2. After the nozzle sprays the fuel, the ignition head 4 in the combustion chamber 3 ignites, igniting the fuel and exhaust gas mixture entering the combustion chamber 3, removing the fiber fines and oil mist in the exhaust gas, and preventing subsequent exhaust gas from entering the heat exchanger 5. The presence of fiber fines and oil affects the heat exchange efficiency of the heat exchanger 5.

[0029] Obviously, before the exhaust gas in the combustion chamber 3 is ignited, the exhaust gas is in a state of free movement in the combustion chamber 3. It is easy for the exhaust gas to enter the heat exchanger 5 before the internal fiber lint and oil are burned and removed, causing the fiber lint and oil in the exhaust gas to form fouling on the surface of the heat exchanger 5, affecting the subsequent heat exchange efficiency of the heat exchanger 5.

[0030] Preferably, an interception net 7 is further provided in the combustion chamber 3, and the interception net 7 is used to intercept fiber lint and oil in the exhaust gas.

[0031] Specifically, the interception net 7 is made of a refractory material, such as stainless steel, nickel-based alloy, etc. The interception net 7 is set to intercept the fiber fines and oil in the exhaust gas, thereby preventing the fiber fines and oil mist in the exhaust gas from directly entering the heat exchanger 5, causing the formation of scale on the heat exchanger 5 and affecting the heat exchange efficiency. In addition, the setting of the interception net 7 allows the fiber fines and oil mist to gather in the combustion chamber 3, which can increase the concentration of fiber fines and oil in the combustion chamber 3 and make it easier for the exhaust gas to be ignited.

[0032] Obviously, in this embodiment, the particle size of the fiber fines and oil mist in the exhaust gas is relatively small, so the aperture of the interception net 7 used to intercept the fiber fines and oil is also very small. As the fiber fines and oil gather on the interception net 7, the aperture of the interception net 7 becomes smaller and smaller. At this time, the efficiency of the exhaust gas discharged from the drying room 1 when passing through the interception net 7 is also slowing down. At this time, a fan (not shown in the figure of the fan) can be set at the end of the heat exchanger 5 away from the combustion chamber 3. The fan sucks the exhaust gas so that the exhaust gas passes through the interception net 7 quickly, avoiding the increase in the interception of fiber fines and oil by the interception net 7, which affects the passing efficiency of the exhaust gas through the interception net 7.

[0033] It should be noted that, as the exhaust gas passes through the interception net 7, the fiber fluff and oil on the interception net 7 gather more and more, which can easily cause the mesh holes on the interception net 7 to become clogged. At this time, the interception net 7 is equivalent to a sealing member that isolates the heat exchanger 5 from the combustion chamber 3. At this time, if the ignition head 4 in the combustion chamber 3 starts to ignite the exhaust gas in the combustion chamber 3, the exhaust gas will cause the gas volume to expand rapidly when it burns, generating a high-pressure shock wave. For the drying room 1, the instantaneous high-pressure shock wave can be isolated by the above-mentioned solenoid valve 21. The high-pressure shock wave has a dredging effect on the heat exchanger 5, but when the high-pressure shock wave passes through the interception net 7, the interception net 7 will be subjected to huge pressure, which is prone to deformation or even damage, resulting in an increase in the replacement frequency of the interception net 7 and an increase in production costs.

[0034] In order to solve the above problems, in this embodiment, a plurality of first slide grooves 8 are opened in parallel on the inner wall of the combustion chamber 3, and a plurality of sliding columns are provided on the edge of a tensioning frame 9. The plurality of sliding columns are slidably connected in the plurality of first slide grooves 8 one by one. The tensioning frame 9 and the first slide grooves 8 are also connected by a plurality of first springs 10. The outer diameter of the tensioning frame 9 is adapted to the inner diameter of the combustion chamber 3, and the intercepting net 7 is located in and fills the inner diameter area of ​​the tensioning frame 9.

[0035] Specifically, in the present embodiment, the inner diameter of the combustion chamber 3 is rectangular, wherein the first chute 8 is arranged on the upper and lower walls of the combustion chamber 3, and two first chutes 8 are arranged on the upper wall or the lower wall, and the two first chutes 8 are respectively located on both sides of the upper wall or the lower wall of the combustion chamber 3, and the tensioning frame 9 is rectangular. The connection position between the tensioning frame 9 and the first chute 8 is connected in a dynamic sealing connection manner. As the exhaust gas discharged from the drying room 1 passes through the intercepting net 7 on the tensioning frame 9, the intercepting net 7 intercepts the fiber fines and oil in the exhaust gas. As the fiber fines and oil on the intercepting net 7 increase, the mesh holes on the intercepting net 7 are gradually blocked. Subsequently, the ignition head 4 in the combustion chamber 3 ignites, igniting the exhaust gas in the combustion chamber 3. The ignited flame acts on the intercepting net 7 synchronously, and the intercepting net 7 is blocked. The fiber fines and oil on it burn, eliminating the blockage of the interception net 7. In addition, as the ignition head 4 is ignited, when the exhaust gas burns in the combustion chamber 3, the gas volume in the combustion chamber 3 expands rapidly, generating a high-pressure shock wave that spreads outward. When the high-pressure shock wave acts on the interception net 7 and the tensioning frame 9, the interception net 7 and the tensioning frame 9 slide along the first slide groove 8 in the direction away from the ignition head 4. At this time, the first spring 10 connected to the tensioning frame 9 in the first slide groove 8 is squeezed and deformed, accumulating elastic potential energy. After the high-pressure shock wave dissipates, the first spring 10 releases the accumulated elastic potential energy. The first spring 10 pushes the tensioning frame 9 to slide in the opposite direction along the first slide groove 8 with the interception net 7, so that the tensioning frame 9 returns to the initial position with the interception net 7, and continues to intercept the fiber fines and oil mist in the exhaust gas.

[0036] Preferably, the interception nets 7 are provided in plurality, and the plurality of interception nets 7 are arranged in sequence along the width direction, and the apertures of the meshes of the multi-layer interception nets 7 gradually become smaller along the conveying direction away from the exhaust gas.

[0037] Specifically, in this embodiment, for the convenience of description, two groups of interception nets 7 are provided, and the two groups of interception nets 7 are respectively installed on the corresponding tensioning frames 9, wherein the aperture between the two groups of interception nets 7 gradually becomes smaller along the conveying direction of the exhaust gas, and a multi-layer interception structure can be formed to filter and intercept the fiber fines and oil mist in the exhaust gas layer by layer, and when the ignition head 4 ignites the mixture of exhaust gas, fiber fines and oil in the combustion chamber 3, the high-pressure shock wave formed acts on the interception net 7, and the first layer of interception net 7 will bear part of the airflow pressure, but the subsequent interception nets 7 will further disperse the remaining pressure, so that the pressure borne by each layer of interception net 7 is less than the pressure borne by the single-layer interception net 7, thereby extending the service life of the interception net 7.

[0038] In order to facilitate replacement, it is preferred that the intercepting net 7 and the inner diameter of the tensioning frame 9 are detachably connected, such as by bolt connection, slot connection, or pin connection. In this example, a bolt connection is selected. It should be noted that the connection method between the intercepting net 7 and the tensioning frame 9 is not unique, and the specific connection method depends on the actual situation.

[0039] Obviously, as ignition continues in the combustion chamber 3 to eliminate fiber lint and oil in the exhaust gas, carbon deposits of combustion products are easily formed on the surface and mesh of the interception net 7, and the carbon deposits are easily adhered to the surface of the interception net 7. To solve this problem, preferably, a plurality of second chutes 11 are further arranged in parallel on the inner wall of the combustion chamber 3, and the tensioning frame 9 away from the exhaust pipe 2 is slidably installed in the second chutes 11. The second chutes 11 and the corresponding tensioning frames 9 are connected by second springs 12, and the elastic constant of the first spring 10 is smaller than the spring constant of the second spring 12.

[0040] It should be noted that, for the convenience of description, in the following, the tensioning frame 9 sliding in the first slide groove 8 will be referred to as the first frame, and the tensioning frame 9 sliding in the second slide groove 11 will be referred to as the second frame, wherein the first frame is closer to the air intake end of the exhaust pipe 2 than the second frame.

[0041] Specifically, the second chute 11 is also provided on the upper and lower walls of the combustion chamber 3, and on the same wall (upper wall or lower wall) of the combustion chamber 3, the second chute 11 is located between the two first chute grooves 8. The spring constant is a physical quantity that measures the hardness or softness of a spring. The larger the spring constant, the harder the spring, and the smaller the deformation under the same force. Conversely, the smaller the spring constant, the softer the spring, and the greater the deformation under the same force (the spring constant is a prior art, and its principle is not elaborated on). As the exhaust gas in the combustion chamber 3 is ignited, the gas volume in the combustion chamber 3 collides rapidly, generating a high-pressure shock wave that spreads outward. When the high-pressure shock wave acts on the two groups of interception nets 7, under the action of the high-pressure shock wave, the interception net 7 close to the exhaust pipe 2 slides along the first slide groove 8 with the corresponding tensioning frame 9 in the direction away from the exhaust pipe 2, and the other group of interception nets 7 slides along the second slide groove 11 with the corresponding tensioning frame 9 in the direction away from the exhaust pipe 2. Because the spring constant of the second spring 12 in the second slide groove 11 is larger than the spring constant of the first spring 10, when the two groups of interception nets 7 are both impacted by the high-pressure shock wave, because the first frame is closer to the high pressure than the second frame, The center of the high-pressure shock wave is located in the center of the first frame, so the moving speed of the first frame is higher than that of the second frame. When the high-pressure shock wave pushes the first frame and the second frame to slide, the second frame will collide with the first frame before sliding to the maximum distance, so that the second frame collides with the interception net 7 on the first frame, and, under the action of the high-pressure shock wave, the first frame will also push the second frame to continue moving, and repeated collisions will occur during the movement. Through the collision, the carbon deposited powder adhering to the interception net 7 is separated from the interception net 7, so as to improve the blockage of the interception net 7; and, through the collision of the two interception nets 7, the carbon deposited powder blocked in the mesh of the interception net 7 can be flushed out, so that the mesh on the interception net 7 remains unobstructed.

[0042] Obviously, in this embodiment, the first frame is closest to the combustion area, so the interception net 7 on the first frame will intercept more carbon deposited powder than other interception nets 7. When the two interception nets 7 on the first frame collide with the second frame, the forces acting on the two interception nets 7 are mutual, that is, the force direction of the interception net 7 on the second frame is in the direction away from the exhaust pipe 2, so that the carbon deposited powder intercepted on the interception net 7 passes through the interception net 7, and with the subsequent suction of the fan, the carbon deposited powder enters the heat exchanger 5, and the subsequent shock wave also has a strong impact and cleaning effect; the force direction of the interception net 7 on the first frame is in the direction of the exhaust pipe 2. After the collision, the carbon deposited powder on the interception net 7 re-enters the combustion chamber 3. With the subsequent suction of the fan, the carbon deposited powder knocked out will re-enter the mesh of the interception net 7 on the first frame, affecting the passing efficiency of the exhaust gas through the interception net 7.

[0043] In order to solve the above problem, in this embodiment, the intercepting net 7 and the tensioning frame 9 are rotatably connected via a first rotating shaft 13, and the first rotating shaft 13 and the tensioning frame 9 are connected via a torsion spring (the torsion spring is not shown in the figure), and a push rod 14 is fixedly installed on the end of the combustion chamber 3 away from the exhaust pipe 2, and the push rod 14 is facing the side of the intercepting net 7 on the second frame.

[0044] Specifically, when ignition is performed in the combustion chamber 3, the high-pressure shock wave generated pushes the first frame to slide along the first slide groove 8, and the second frame to slide along the second slide groove 11. Because the first frame is closer to the center of the high-pressure shock wave than the second frame, the movement speed of the first frame is higher than the movement speed of the second frame. When the high-pressure shock wave pushes the first frame and the second frame to slide, the second frame will collide with the first frame before sliding to the maximum distance, so that the second frame will collide with the interception net 7 on the first frame synchronously, and the carbon deposited powder in the mesh of the interception net 7 will be vibrated and shaken out. Moreover, under the action of the high-pressure shock wave, the first frame will also push the second frame to continue moving, and repeated collisions will occur during the movement. When the second frame is about to move to the maximum displacement distance, the end of the push rod 14 hits the side of the interception net 7 on the second frame, squeezing the first frame and pushing the second frame to continue sliding. The push rod 14 applies force to the side of the interception net 7. Under the action of the push rod 14, the interception net 7 on the second frame rotates around the first rotating shaft 13 (in contact with the first rotating shaft 13) The torsion spring deformation accumulates elastic potential energy), because the interception net 7 on the second frame rotates, the interception net 7 on the first frame is squeezed and rotates synchronously. At this time, the interception nets 7 on the first frame and the second frame are deflected. After the deflection, the interception nets 7 no longer have an interception effect. This improves the cleaning effect on the one hand and reduces the negative impact of the shock wave on the other hand. At this time, the combustion chamber 3 is connected to the inside of the heat exchanger 5. Under the action of the fan, the carbon deposited powder in the combustion chamber 3 is sucked away to remove the carbon deposits in the combustion chamber 3. After the high-pressure shock wave dissipates, under the action of the first spring 10 and the second spring 12, the first frame and the second frame both carry the interception net 7 toward the exhaust pipe 2. At this time, the interception net 7 on the second frame gradually moves away from the top rod 14, and the interception net 7 on the second frame loses the squeezing of the top rod 14. The torsion spring releases the accumulated elastic potential energy, causing the interception net 7 to return to its initial state and continue to separate the combustion chamber 3 from the heat exchanger 5, intercepting the fiber fines and oil in the exhaust gas until the next ignition process.

[0045] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A heat recovery device for a stenter drying room, comprising an exhaust pipe connected to the drying room for discharging exhaust gas, wherein the exhaust pipe is connected to a heat exchanger, characterized in that: A combustion chamber is provided on the exhaust pipe upstream of the heat exchanger. An ignition head for ignition is provided in the combustion chamber. The exhaust gas in the drying room enters the combustion chamber through the exhaust pipe, and the ignition head ignites the exhaust gas.

2. The heat recovery equipment for a stenter drying room according to claim 1, characterized in that: The combustion chamber is also provided with an oil injection mechanism, which intermittently injects fuel into the combustion chamber.

3. The heat recovery equipment for a stenter drying room according to claim 1, characterized in that: An interception net is also provided in the combustion chamber and is made of a refractory material.

4. The heat recovery equipment for a stenter drying room according to claim 3, characterized in that: A plurality of first slide grooves are arranged in parallel on the inner wall of the combustion chamber, and a plurality of sliding columns are provided on the edge of a tensioning frame. The plurality of sliding columns are slidably connected in the plurality of first slide grooves one by one. The tensioning frame and the first slide grooves are also connected by a plurality of first springs. The outer diameter of the tensioning frame is adapted to the inner diameter of the combustion chamber, and the intercepting net is located at and fills the inner diameter area of ​​the tensioning frame.

5. The heat recovery equipment for a stenter drying room according to claim 4, characterized in that: There are multiple tensioning frames, which are spaced apart along the axial direction of the combustion chamber. The aperture of the mesh of the multi-layer intercepting net gradually becomes smaller along the conveying direction away from the exhaust gas.

6. The heat recovery equipment for a stenter drying room according to claim 4, characterized in that: The intercepting net is detachably connected to the inner diameter of the tensioning frame.

7. The heat recovery equipment for a stenter drying room according to claim 5, characterized in that: A plurality of second slide grooves are also arranged in parallel on the inner wall of the combustion chamber, and the tensioning frame away from the exhaust pipe is slidably installed in the second slide groove. The second slide groove and the corresponding tensioning frame are connected by a second spring, and the spring constant of the first spring is smaller than the spring constant of the second spring.

8. The heat recovery equipment for a stenter drying room according to claim 7, characterized in that: The intercepting net and the tensioning frame are rotationally connected via a first rotating shaft, and the first rotating shaft and the tensioning frame are connected via a torsion spring.

9. The heat recovery equipment for a stenter drying room according to claim 8, characterized in that: A push rod is fixedly installed on one end of the combustion chamber away from the exhaust pipe, and the push rod is opposite to the side of the interception net on the tensioning frame away from the exhaust pipe. Based on the squeezing of the push rod, the interception net rotates around the first rotating shaft.

10. The heat recovery equipment for a stenter drying room according to claim 1, characterized in that: The bottom of the combustion chamber is provided with an openable and closable opening.

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