Waste heat recovery regulator of waste heat boiler

Abstract

The utility model relates to a waste heat recovery regulator of a waste heat boiler, which is arranged in a heat insulation layer in the waste heat boiler and is provided with a central pipe with one end filled with high-temperature tail gas, the other end of the central pipe is axially and fixedly connected with a lengthening pipe, the lengthening pipe is connected with a rectifying sleeve, and long-waist-shaped exhaust windows are uniformly distributed on the peripheral surface of the rectifying sleeve in the circumferential direction. A valve element assembly is arranged in the rectifying sleeve in a sliding mode and provided with a valve element which is pressed tightly or far away from the end face of the lengthened pipe to adjust the high-temperature tail gas discharge amount, and the periphery of the valve element is in sliding fit with an inner hole of the rectifying sleeve. The actuating mechanism is rotationally connected with the rear end of the valve rod through a swing arm to push the valve element to move far away from or close to the end face of the lengthened pipe. The lengthened pipe is fixedly connected to the central pipe in the axial direction, so that the overall length of the valve element assembly is shortened, and the overall weight of the valve element assembly is reduced; meanwhile, guide structures are arranged at the front end and the rear end of the valve element assembly respectively, abrasion generated in the valve element moving process can be effectively reduced, and smooth opening and closing of the valve are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat utilization, in particular to a waste heat recovery regulator for a waste heat boiler. Background Art

[0002] Waste heat boiler is a boiler that uses high-temperature tail gas from the production process of industrial boilers to produce steam. It is a high-temperature, high-pressure heat exchanger. The gas temperature in the waste heat recovery section is generally between 850℃-1000℃. During the use of waste heat boilers, due to the low strength of the components of the waste heat recovery regulator, in a high temperature environment, the components are severely deformed, which seriously affects the safe operation of the equipment.

[0003] The existing waste heat recovery regulator conventionally adopts a valve core baffle structure. The thickness of the valve core baffle is 30mm and the material is Inconel601. In the temperature range of about 900℃, this material and structure thickness cannot be used for a long time. The valve core baffle is easily deformed and cannot be effectively sealed, resulting in waste of high-temperature exhaust gas. At the same time, a guide groove is processed on the conical fairing set at the outlet of the valve core baffle, and a guide support plate is welded and processed on the outer circle of the valve core component. During the switching process of the valve core, the weight of the entire valve core is supported on the guide groove by the guide support plate. Due to the long-term use in a high-temperature environment and the large dead weight of the valve core component, all the weight of the valve core component is supported between the guide support plate and the guide groove. Mutual wear and deformation occur during long-term use, which eventually causes the valve to become stuck during the switching process, and the valve stem breaks, affecting the normal use of the valve. Summary of the invention

[0004] The technical problem to be solved by the utility model is: in order to overcome the deficiencies in the prior art, the utility model provides a waste heat boiler waste heat recovery regulator which can prevent parts from being deformed by high temperature and ensure the normal use of valves.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a waste heat boiler waste heat recovery regulator is arranged in the insulation layer inside the waste heat boiler, and has a central tube with one end extending out of the waste heat boiler body and connected to the boiler exhaust gas discharge end to allow high-temperature exhaust gas to pass through. The other end of the central tube is axially fixed with an extension pipe, and the extension pipe is connected to a fairing sleeve through a flange. Long waist-shaped exhaust windows are evenly distributed on the outer circumferential surface of the fairing sleeve in the circumferential direction. A valve core assembly is slidably arranged in the fairing sleeve, and the valve core assembly has a valve core that is pressed against or away from the end face of the extension pipe to adjust the discharge amount of the high-temperature exhaust gas. The outer periphery of the valve core is slidably matched with the inner hole of the fairing sleeve, and a valve stem is fixedly connected to the rear end of the valve core. The actuator arranged outside the waste heat boiler body is rotatably connected to the rear end of the valve stem through a swing arm to push the valve core to move away from or close to the end face of the extension pipe.

[0006] Preferably, the front end surface of the valve core has a spherical sealing surface, and the outer diameter of the valve core is larger than the outer diameter of the extension tube.

[0007] Specifically, the valve core has a rectangular cavity in the center, the front end of the valve stem has a spherical joint with a gap inserted into the rectangular cavity, and a pressure plate is fixedly connected to the rear end surface of the valve core outside the rectangular cavity.

[0008] Furthermore, there is a gap of 5 mm between the pressure plate and the rear end surface of the spherical joint.

[0009] Specifically, a first guide ring is fixedly connected to the inner wall of the extension tube, a second guide ring is fixedly connected to the rear end of the insulation layer of the waste heat boiler, the second guide ring is fixedly connected to the rear end face of the fairing sleeve, a guide rod that slides with the first guide ring is fixedly connected to the front end face of the valve core, and the valve stem slides with the second guide ring and extends out of the second guide ring to be hinged to the swing arm.

[0010] Furthermore, the first guide ring is provided with an air inlet window for allowing high-temperature exhaust gas to flow into the fairing sleeve; the second guide ring is provided with an air outlet window for discharging the cold and hot mixed gas into the waste heat boiler body.

[0011] The beneficial effects of the utility model are as follows: the utility model shortens the overall length of the valve core assembly and reduces the overall weight of the valve core assembly by axially fixing the extension tube to the center tube; at the same time, guide structures are respectively arranged at the front and rear ends of the valve core assembly, which can effectively reduce the wear generated during the movement of the valve core and ensure smooth opening and closing of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The utility model is further described below in conjunction with the accompanying drawings and implementation modes.

[0013] Figure 1 It is a structural schematic diagram of the utility model.

[0014] Figure 2 This is a diagram of the valve core opening state of the utility model.

[0015] Figure 3 This is a diagram of the valve core closed state of the utility model.

[0016] In the figure: 1. center tube, 2. extension tube, 3. fairing sleeve, 3-1. exhaust window, 4. valve core, 4-1. rectangular cavity, 5. valve stem, 5-1. spherical joint, 6. waste heat boiler body, 7. actuator, 8. swing arm 9. insulation layer, 10. pressure plate, 11. first guide ring, 11-1. air inlet window, 12. second guide ring, 12-1. air outlet window, 13. guide rod. DETAILED DESCRIPTION

[0017] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0018] like Figure 1 , Figure 2 , Figure 3 A waste heat boiler waste heat recovery regulator is shown, and the waste heat boiler includes a waste heat boiler body 6, and the air inlet end of the waste heat boiler body 6 has an enclosed space surrounded by an insulation layer 9. An actuator 7 is arranged outside the waste heat boiler body 6, and the actuator 7 adopts a piston drive structure, and a push rod is connected to the piston, and the push rod is rotatably connected to a swing arm 8.

[0019] The regulator is arranged in a closed space surrounded by an insulation layer 9, and has a central tube 1 fixed on the side wall of the waste heat boiler body 6. One end of the central tube 1 is connected to the exhaust end of the industrial boiler to introduce high-temperature exhaust gas into the waste heat boiler body 6. The other end of the central tube 1 extends into the waste heat boiler body 6 and is fixedly connected with an extension tube 2 with a length of 200 mm by welding. The inner end face of the extension tube 2 is connected with a fairing sleeve 3 through a flange. The outer circumferential surface of the fairing sleeve 3 is circumferentially evenly distributed with long waist-shaped exhaust windows 3-1, and the length direction of the exhaust windows 3-1 extends along the axial direction of the fairing sleeve 3.

[0020] A valve core assembly is slidably disposed in the fairing sleeve 3, and the valve core assembly includes a valve core 4 and a valve stem 5, wherein the outer periphery of the valve core 4 is slidably matched with the inner hole of the fairing sleeve 3, the front end face of the valve core 4 faces the side of the extension tube 2, and the outer diameter of the valve core 4 is slightly larger than the outer diameter of the extension tube 2; the front end face of the valve core 4 is a spherical sealing surface, so that the valve core 4 has a certain self-alignment and adjustment effect on deformation caused by thermal expansion.

[0021] The valve stem 5 is arranged at the rear end of the valve core 4. The center of the rear end face of the valve core 4 has a rectangular cavity 4-1. The front end of the valve stem 5 has a spherical joint 5-1 with a gap inserted into the rectangular cavity 4-1. A pressure plate 10 is fixedly connected to the rear end face of the valve core 4 outside the rectangular cavity 4-1 by bolts. In particular, after the pressure plate 10 is fixed, there is a gap of 5 mm between the pressure plate 10 and the rear end face of the spherical joint 5-1 to prevent the locking phenomenon caused by the deformation of the metal material due to the thermal expansion effect.

[0022] A first guide ring 11 is fixedly connected to the inner wall of the extension tube 2, and a second guide ring 12 is welded and fixed to the rear end of the insulation layer 9 which forms a closed space. The second guide ring 12 is welded and fixed to the rear end face of the fairing sleeve 3. Four circumferentially evenly distributed air intake windows 11-1 for flowing high-temperature exhaust gas into the fairing sleeve 3 are provided on the web of the first guide ring 11; four air outlet windows 12-1 for discharging the cold and hot mixed gases into the waste heat boiler body 6 are provided on the web of the second guide ring 12, and the four air outlet windows 12-1 are evenly distributed along the circumference of the second guide ring 12.

[0023] The front end surface of the valve core 4 is fixedly connected with a guide rod 13 that is slidably matched with the first guide ring 11 . The valve stem 5 is slidably matched with the second guide ring 12 and extends out of the second guide ring 12 and is hinged to the swing arm 8 .

[0024] Since the connection between the actuator 7 and the valve stem 5 of the valve core assembly is a hinge structure connection, when the actuator 7 drives the swing arm 6 to move, the swing arm 8 rotates around its central fixed point, and its actual path is an arc path. Therefore, when the valve stem 5 moves back and forth, there is a certain deflection. Therefore, there is a single-sided gap of 5 mm between the inner hole of the second guide ring 12 and the outer periphery of the valve stem 5.

[0025] When in use, the actuator 7 pulls the valve stem 5 through the swing arm 8, and the valve stem 5 drives the valve core 4 away from the end face of the extension tube 2. The high-temperature exhaust gas generated by the industrial boiler is connected through the central tube 1 and enters the fairing sleeve 3 through the air inlet window 11-1 on the first guide ring 11, and then flows into the closed space surrounded by the insulation layer 9 through the exhaust window 3-1. After being mixed with the cold air, it enters the waste heat boiler body 6 from the air outlet window 12-1 on the second guide ring 12. The mixed hot and cold air is discharged through the pipeline, and the heated water is used as boiler water replenishment and domestic water as needed, or the heated air is used as boiler combustion air or drying materials, so as to save fuel costs, reduce production costs, reduce exhaust emissions, and achieve energy conservation and environmental protection.

[0026] If the temperature of the cold or hot air needs to be adjusted, the actuator 7 can pull the valve stem 5 through the swing arm 8, so that the valve core 4 moves away from or close to the end face of the extension pipe 2, changing the opening size of the exhaust window 3-1 on the fairing sleeve 3, thereby adjusting the discharge amount of the high-temperature exhaust gas in the central pipe 1 to the waste heat boiler body 6.

[0027] In order to reduce the overall installation weight, the utility model shortens the overall length of the valve core assembly by axially fixing a 200mm long extension tube 2 on the center tube 1 on the basis of the original structure. At the same time, considering that the valve stem 5 is relatively long, the weight of the valve core 5 is relatively large during the opening process of the actuator 7, which will produce a cantilever beam effect and serious eccentric wear effect. Therefore, a first guide ring 11 is added to the inner wall of the extension tube 2, and a guide rod 13 is installed on the front end surface of the valve core 5. In this way, guide structures are respectively provided at the front and rear ends of the valve core assembly, which can effectively avoid the cantilever beam effect, and the valve core assembly can be fully guided during the operation process.

[0028] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A waste heat boiler waste heat recovery regulator, arranged in an insulation layer (9) inside a waste heat boiler, having a central tube (1) with one end extending out of a waste heat boiler body (6) and connected to a boiler tail gas discharge end for passing high-temperature tail gas, wherein: The other end of the central tube (1) is axially fixedly connected to an extension tube (2), and the extension tube (2) is connected to a fairing sleeve (3) through a flange. The outer circumferential surface of the fairing sleeve (3) is circumferentially evenly distributed with long waist-shaped exhaust windows (3-1). A valve core assembly is slidably arranged in the fairing sleeve (3). The valve core assembly has a valve core (4) that is pressed against or away from the end face of the extension tube (2) to adjust the discharge amount of high-temperature exhaust gas. The outer periphery of the valve core (4) is slidably matched with the inner hole of the fairing sleeve (3). A valve stem (5) is fixedly connected to the rear end of the valve core (4). An actuator (7) arranged outside the waste heat boiler body (6) is rotatably connected to the rear end of the valve stem (5) through a swing arm (8) to push the valve core (4) to move away from or close to the end face of the extension tube (2).

2. The waste heat recovery regulator for a waste heat boiler according to claim 1, characterized in that: The front end surface of the valve core (4) has a spherical sealing surface, and the outer diameter of the valve core (4) is greater than the outer diameter of the extension tube (2).

3. The waste heat recovery regulator for a waste heat boiler according to claim 1, characterized in that: The valve core (4) has a rectangular cavity (4-1) at its center, the front end of the valve stem (5) has a spherical joint (5-1) which is inserted into the rectangular cavity (4-1) through a gap, and a pressure plate (10) is fixedly connected to the rear end surface of the valve core (4) outside the rectangular cavity (4-1).

4. The waste heat recovery regulator for a waste heat boiler according to claim 3, characterized in that: There is a gap of 5 mm between the pressure plate (10) and the rear end surface of the spherical joint (5-1).

5. The waste heat recovery regulator for a waste heat boiler according to claim 4, characterized in that: The inner wall of the extension tube (2) is fixedly connected with a first guide ring (11), the rear end of the insulation layer (9) of the waste heat boiler is fixedly connected with a second guide ring (12), the second guide ring (12) is fixedly connected with the rear end face of the fairing sleeve (3), the front end face of the valve core (4) is fixedly connected with a guide rod (13) which is slidably matched with the first guide ring (11), and the valve stem (5) is slidably matched with the second guide ring (12) and extends out of the second guide ring (12) to be hinged with the swing arm (8).

6. The waste heat recovery regulator for a waste heat boiler according to claim 5, characterized in that: The first guide ring (11) is provided with an air inlet window (11-1) for allowing high-temperature exhaust gas to flow into the fairing sleeve (3); the second guide ring (12) is provided with an air outlet window (12-1) for discharging cold and hot mixed gases into the waste heat boiler body (6).

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