A conical ash control valve with an automatic slag poking function

Abstract

The present invention discloses a conical ash control valve with an automatic slag poking function, which comprises a valve seat provided with a boiler slag discharge port and a valve body provided with an ash control valve discharge port. It further includes a valve rod and a slag poking rod. The valve rod is slidably arranged in the valve body, and the slag poking rod is arranged in the valve rod. The slag poking rod can move along the axis of the valve rod. The slag poking rod breaks up the massive materials in the boiler slag discharge port by reciprocating telescoping. The slag poking rod is provided with a compressed air passage, and the head of the slag poking rod is provided with a plurality of purging holes communicated with the compressed air passage. The purging holes blow out compressed air to enhance the fluidity of the broken materials. The reciprocating telescoping of the slag poking rod completes the agitation of the materials, making the ash and slag accumulated at the boiler slag discharge port loose and separated or breaking up the large-scale slag formation. At the same time, the slag poking rod continuously purges the broken ash and slag near the boiler slag discharge port by spraying high-pressure gas through the purging holes, enhancing the fluidity of the ash and slag, and achieving the purpose of automatic slag poking.

Description

Technical Field

[0001] The present invention relates to the field of high-temperature ash valves, and specifically to a conical ash control valve with an automatic slag poking function. Background Art

[0002] The development and application of circulating fluidized bed boiler technology have been widely used. This technology is an advanced technology for clean coal combustion and realizing the sustainable development strategy. It integrates the advantages of energy conservation, clean combustion, safety and reliability, and reduced pollution emissions. However, in the actual operation of the boiler, some local structural problems will also affect the boiler efficiency. For example, due to frequent blockages at the slag discharge port, the boiler slag discharge gradually becomes abnormal, seriously affecting the safe and economic operation of the boiler.

[0003] At present, the common way to dredge the ash (slag) discharge port of a circulating fluidized bed boiler is to install a slag poking inclined pipe above the valve or the slag dropping pipe to facilitate dredging when the slag is blocked. Once the ash (slag) discharge port is blocked, the conventional dredging method is to organize personnel to insert a slag poking rod through the slag poking inclined pipe into the boiler ash (slag) discharge port for manual slag poking. The labor intensity of on-site operators is high. Since the furnace of the circulating fluidized bed boiler is at a slightly positive pressure, there is a risk of high-temperature ash and slag leakage during slag poking, which is likely to cause scalding accidents and pose major safety hazards. At the same time, when dredging through the slag poking inclined pipe, if the adopted angle is inappropriate, the slag poking rod acts on the wear-resistant castable at the boiler ash (slag) discharge port, increasing the risk of the wear-resistant castable in the furnace falling off. And it takes a long time from issuing the slag poking task to organizing personnel to go to the site to complete the dredging of the ash (slag) discharge port. To avoid damage to the ash (slag) discharge port caused by blockage for too long, it is usually necessary to stop the machine and wait for personnel to come for dredging after blockage, thus affecting the normal use of the ash (slag) discharge port. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a conical ash control valve with an automatic slag poking function. The slag poking rod retracts and extends back and forth to complete the agitation of materials, making the ash and slag accumulated at the boiler slag discharge port loose and separated or breaking large lumps of slag. At the same time, the slag poking rod sprays high-pressure gas through the purging holes to continuously purge the broken ash and slag near the boiler slag discharge port, enhancing the fluidity of the ash and slag and achieving the purpose of automatic slag poking.

[0005] The object of the present invention is achieved by the following technical solutions: A conical ash control valve with an automatic slag poking function, comprising a valve seat provided with a boiler slag discharge port and a valve body provided with an ash control valve discharge port, further comprising a valve stem and a slag poking rod. The valve stem is slidably disposed through the valve body, and the boiler slag discharge port is located on the moving path of the valve stem. The slag poking rod is disposed through the valve stem, and the slag poking rod can move along the axis of the valve stem. The slag poking rod breaks up the massive materials in the boiler slag discharge port by reciprocating telescoping. The slag poking rod is provided with a compressed air channel, and the head of the slag poking rod is provided with a plurality of purging holes communicating with the compressed air channel. The purging holes blow out compressed air to enhance the fluidity of the broken materials.

[0006] Further, the slag poking rod comprises a pipe cap, a connecting pipe, an intermediate pipe joint, a steel pipe and a tail pipe joint. The purging holes are opened on the pipe cap. The pipe cap is threadedly connected to the connecting pipe. The connecting pipe is detachably connected to the steel pipe through the intermediate pipe joint. One end of the steel pipe away from the connecting pipe is connected to the tail pipe joint. The tail pipe joint is connected with a slag poking driving device, and the slag poking driving device is used to drive the slag poking rod to perform a reciprocating linear motion.

[0007] Further, the valve stem comprises a conical valve head and a water-cooled valve stem. One end of the water-cooled valve stem is embedded in the large-diameter end of the valve head. The water-cooled valve stem and the valve head are tightly pressed and connected by heat-resistant high-strength bolts. The water-cooled valve stem is connected with a valve stem driving device.

[0008] Further, a flexible heat-conducting material is disposed between the water-cooled valve stem and the valve head. The flexible heat-conducting material is a material that simultaneously has heat-conducting characteristics and extensible and deformable characteristics.

[0009] Further, the water-cooled valve stem comprises an outer pipe, an intermediate pipe, an inner pipe and a perforated end. One end of the outer pipe is fixed to the perforated end. The water-cooled valve stem is embedded into the valve head through the perforated end. The intermediate pipe is disposed through the outer pipe, and a first cooling channel is formed between the intermediate pipe and the outer pipe. The inner pipe is disposed through the intermediate pipe, and a second cooling channel communicating with the first cooling channel is formed between the inner pipe and the intermediate pipe.

[0010] Further, a cooling water inlet communicating with the first cooling channel is opened on the outer wall of the outer pipe, a cooling water outlet communicating with the second cooling channel is opened on the outer wall of the intermediate pipe, one end of the inner pipe is fixed to the inner wall of the perforated end, and the slag poking rod is disposed through the inner pipe.

[0011] Further, one end of the outer tube away from the perforated end is fixed to a perforated end cap one. The intermediate tube penetrates into the outer tube through the perforated end cap one and is fixed to the perforated end cap one. One end of the intermediate tube away from the perforated end is fixed to a perforated end cap two. The inner tube penetrates into the intermediate tube through the perforated end cap two and is fixed to the perforated end cap two. A compressed air pipe is communicated with the inner tube, and compressed air holes communicating with the compressed air channel are formed in the slag poking rod.

[0012] Further, the valve rod driving device includes a lead screw, a valve rod connecting seat and a driving motor. One end of the lead screw is rotatably connected to the valve body, and the other end is connected to the output shaft of the driving motor. The valve rod connecting seat is threadedly connected to the lead screw, and the valve rod connecting seat is fixedly sleeved on the outer tube.

[0013] Further, a plurality of annular plates are fixedly sleeved on the steel pipe, and graphite packing is filled between adjacent two annular plates.

[0014] Further, the slag poking driving device adopts a cylinder or a linear reciprocating motor.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. The material is agitated by the reciprocating telescopic movement of the slag poking rod, so that the ash and slag accumulated at the boiler slag discharge port are loosened and separated, or the large lumps of slag are broken. The high-pressure gas ejected from the purging holes continuously purges the broken ash and slag near the boiler slag discharge port, enhancing the fluidity of the ash and slag, thereby improving the dredging efficiency, achieving the purpose of automatic slag poking, and the dredging of the boiler slag discharge port can be completed without stopping the furnace, ensuring the long-term safe and economic operation of the circulating fluidized bed boiler.

[0017] 2. The valve head adopts a conical structure. The length of the valve head extending into the boiler slag discharge port is controlled by the movement of the valve rod, and the gap size between the inner wall of the boiler slag discharge port and the valve head is controlled, so as to control the opening degree of the ash control valve, achieve the purpose of controlling the ash and slag flow rate, and realize the flow regulation function of the ash control valve.

[0018] 3. The slag poking rod adopts a segmented connection structure. The pipe cap and the connecting pipe arranged close to the high-temperature ash and slag are made of heat-resistant and wear-resistant cast high-temperature alloy to maintain a relatively high high-temperature strength, while the intermediate pipe joint, the steel pipe and the tail pipe joint arranged away from the high-temperature ash and slag can be made of ordinary steel. Each section of the slag poking rod can be made of different materials according to the specific working conditions, ensuring that the slag poking rod can continuously operate under high-temperature and high-strength working conditions while greatly reducing the material cost of the slag poking rod. The segmented connection structure also facilitates the replacement of damaged components, avoids overall replacement, and reduces the replacement cost of the slag poking rod.

[0019] 4. The water-cooled valve stem cools the slag poking rod and the valve stem through water cooling. At the same time, the flow of compressed air can also cool the slag poking rod and the valve stem. Combined with the water-cooling method, the cooling effect is improved, the service life of the slag poking rod and the valve stem is extended. The flow of compressed air between the slag poking rod and the valve stem also plays a sealing role, preventing ash from entering the inside of the valve stem and avoiding the deformation of the slag poking rod affected by high-temperature ash.

[0020] 5. The slag poking rod is arranged inside the valve stem. The valve stem has a guiding effect on the movement of the slag poking rod, avoiding the shedding of the furnace wear-resistant castable when the slag poking rod blindly pokes the slag.

[0021] 6. Automatic slag poking is realized, reducing the labor intensity, quickly and effectively completing the dredging of the boiler slag discharge port, avoiding the problem of high-temperature ash leakage caused by manual slag poking, and reducing the safety risks of the unit and personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 FIG. is a schematic diagram of the working state of the slag poking position of a conical ash control valve with an automatic slag poking function according to the present invention;

[0023] Figure 2 FIG. is a schematic diagram of the structure of the valve stem in a conical ash control valve with an automatic slag poking function according to the present invention;

[0024] Figure 3 FIG. is a schematic diagram of the structure of the slag poking rod in a conical ash control valve with an automatic slag poking function according to the present invention;

[0025] Figure 4 FIG. is a schematic diagram of the structure of the water-cooled valve stem in a conical ash control valve with an automatic slag poking function according to the present invention;

[0026] Figure 5 FIG. is a schematic diagram of the working state of the fully closed position of a conical ash control valve with an automatic slag poking function according to the present invention;

[0027] Figure 6 FIG. is a schematic diagram of the working state of the fully open position of a conical ash control valve with an automatic slag poking function according to the present invention;

[0028] In the figure, 1 - boiler slag discharge port, 2 - valve seat, 3 - ash control valve discharge port, 4 - valve body, 5 - valve rod, 6 - slag poking rod, 7 - compressed air passage, 8 - purging hole, 9 - valve head, 10 - flexible heat-conducting material, 11 - water-cooled valve rod, 12 - heat-resistant high-strength bolt, 13 - outer pipe, 14 - intermediate pipe, 15 - inner pipe, 16 - perforated end, 17 - first cooling passage, 18 - second cooling passage, 19 - cooling water inlet, 20 - cooling water outlet, 21 - pipe cap, 22 - connecting pipe, 23 - intermediate pipe joint, 24 - steel pipe, 25 - tail pipe joint, 26 - circular ring plate, 27 - perforated end cover one, 28 - perforated end cover two, 29 - compressed air pipe, 30 - compressed air hole, 31 - lead screw, 32 - valve rod connection seat, 33 - drive motor, 34 - slag poking drive device, 35 - flange, 36 - valve seat inner lining pipe. Detailed implementation mode

[0029] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings, but the protection scope of the present invention is not limited to the following.

[0030] As Figures 1 to 6As shown in the figure, a conical ash control valve with an automatic slag poking function includes a valve seat 2 provided with a boiler slag discharge port 1 and a valve body 4 provided with an ash control valve discharge port 3. It also includes a valve rod 5 and a slag poking rod 6. The valve rod 5 is slidably inserted into the valve body 4. The boiler slag discharge port 1 is located on the moving path of the valve rod 5. The slag poking rod 6 is inserted into the valve rod 5 and can move along the axis of the valve rod 5. The slag poking rod 6 breaks the massive materials in the boiler slag discharge port 1 by reciprocating telescoping. The slag poking rod 6 is provided with a compressed air channel 7, and the head of the slag poking rod 6 is provided with a plurality of purge holes 8 communicating with the compressed air channel 7. The compressed air blown out from the purge holes 8 is used to enhance the fluidity of the broken materials. The opening and closing of the boiler slag discharge port 1 are realized by the movement of the valve rod 5. The head of the valve rod 5 extends into the boiler slag discharge port 1 to block the boiler slag discharge port 1, realizing the closing of the boiler slag discharge port 1. The valve rod 5 withdraws from the boiler slag discharge port 1 and maintains a certain distance, realizing the opening of the boiler slag discharge port 1. When poking the slag: The valve rod 5 drives the slag poking rod 6 to move near the boiler slag discharge port 1, which is used to reduce the moving distance of the slag poking rod 6, thereby reducing the length setting of the slag poking rod 6. The valve rod 5 is in contact with the boiler slag discharge port 1, forming a gap for the ash and slag to flow through between the boiler slag discharge port 1 and the valve rod 5. At this time, the slag poking rod 6 extends into the boiler slag discharge port 1, and the material is agitated by the reciprocating telescoping of the slag poking rod 6, so that the ash and slag accumulated in the boiler slag discharge port 1 are loosened and separated or the large lumps of slag are broken. At the same time, the slag poking rod 6 is connected to an external compressed air device, and the compressed air flows into the compressed air channel 7 and finally flows out from the purge holes 8. The high-pressure gas ejected from the purge holes 8 continuously purges the broken ash and slag near the boiler slag discharge port, enhancing the fluidity of the ash and slag. While breaking the ash and slag, the fluidity of the broken ash and slag is improved, so that the ash and slag are quickly broken and discharged from the boiler slag discharge port 1, thereby improving the dredging efficiency, achieving the purpose of automatic slag poking, and the dredging of the boiler slag discharge port can be completed without stopping the furnace, ensuring the long-term safe and economic operation of the circulating fluidized bed boiler.

[0031] Further, as Figure 2As shown in the figure, the valve stem 5 includes a conical valve head 9 and a water-cooled valve stem 11. One end of the water-cooled valve stem 11 is embedded in the large-diameter end of the valve head 9. The water-cooled valve stem 11 and the valve head 9 are tightly pressed and connected by heat-resistant high-strength bolts 12. The water-cooled valve stem 11 is connected with a valve stem driving device. The valve head 9 is screwed into the boiler slag discharge port 1. A clearance channel for ash slag to flow through is formed between the inner wall of the boiler slag discharge port 1 and the conical surface of the valve head 9. Since the valve head 9 has a conical surface structure, as the valve head 9 goes deeper, this clearance channel will gradually narrow. When the valve head 9 abuts against the end face of the boiler slag discharge port 1, the blocking of the boiler slag discharge port 1 is completed, and the regulation of the ash slag flow rate or the opening and closing is realized by the depth of the valve head 9 screwed into the boiler slag discharge port 1. Since the valve head 9 will directly contact with high-temperature ash slag, the valve head 9 is made of a heat-resistant and wear-resistant cast superalloy, ensuring that the valve head 9 has a relatively high heat resistance and wear resistance strength, extending the service life of the valve head 9. At the same time, the valve head 9 can be cooled by the water-cooled valve stem 11, reducing the temperature of the valve head 9, further extending the service life of the valve head 9, and avoiding the inconvenience caused by frequent replacement of the valve head 9 and affecting the normal operation of the ash control valve.

[0032] Furthermore, a flexible heat-conducting material 10 is arranged between the water-cooled valve stem 11 and the valve head 9. The flexible heat-conducting material 10 is a material that simultaneously has heat-conducting characteristics and extensible and deformable characteristics. By arranging the flexible heat-conducting material 10, sufficient heat exchange can be carried out between the water-cooled valve stem 11 and the valve head 9 during use, and the water-cooled valve stem 11 can effectively cool the valve head 9, avoiding problems such as easy burnout and deformation of the valve head 9 due to insufficient cooling during long-term use, and extending the service life of the high-temperature ash slag valve. At the same time, the water-cooled valve stem 11 is embedded in the valve head 9, and the valve head 9, the water-cooled valve stem 11, and the flexible heat-conducting material 10 are in close contact and in a compressed state. When the valve head 9 is fully cooled, it will deform under the thermal expansion and contraction effect. Since it is supported by the water-cooled valve stem 11 and the flexible heat-conducting material 10 inside during the deformation process, its deformation amount is small, ensuring the accuracy of flow rate regulation through the valve head 9 and ensuring the long-term normal and stable use of the ash slag valve. The flexible heat-conducting material 10 is selected from one or both of copper and graphite. During assembly, the flexible heat-conducting material 10 is first filled in the valve head 9, and then the water-cooled valve stem 11 and the valve head 9 are tightly pressed together by a press, ensuring that the flexible heat-conducting material 10 is fully extended under extrusion, so that sufficient contact is maintained between the crystal atomic structures of the water-cooled valve stem 11 and the valve head 9 and the flexible heat-conducting material 10, thereby ensuring the efficiency of its heat conduction.

[0033] Furthermore, as Figure 3As shown, the slag poking rod 6 includes a pipe cap 21, a connecting pipe 22, an intermediate pipe joint 23, a steel pipe 24 and a tail pipe joint 25. A purging hole 8 is formed in the pipe cap 21. The pipe cap 21 is threadedly connected to the connecting pipe 22. The connecting pipe 22 is detachably connected to the steel pipe 24 through the intermediate pipe joint 23. One end of the steel pipe 24 away from the connecting pipe 22 is connected to the tail pipe joint 25. The tail pipe joint 25 is connected with a slag poking driving device 34, and the slag poking driving device 34 is used to drive the slag poking rod 6 to perform reciprocating linear motion. The connecting pipe 22 and the intermediate pipe joint 23 are threadedly connected. The steel pipe 24 is fixedly connected to the intermediate connecting head 23 by welding. The tail pipe joint 25 is welded and installed at the tail of the steel pipe 24, so that the easily damaged pipe cap 21 and the connecting pipe 22 that are directly in contact with the high-temperature ash slag are detachably connected, facilitating the replacement of the pipe cap 21 and the connecting pipe 22. The intermediate pipe joint 23, the steel pipe 24 and the tail pipe joint 25 are fixedly connected by welding to ensure the overall stability and connection strength of the slag poking rod 6. The valve head 9 is provided with an enlarged hole with a diameter adapted to the size of the connecting pipe 22, enabling the slag poking rod 6 to stretch back and forth in the enlarged hole, while reducing the gap between the connecting pipe 22 and the enlarged hole, and preventing a large amount of high-temperature ash slag from entering the gap formed between the valve rod 5 and the slag poking rod 6. During slag poking, the pipe cap 21 and the connecting pipe 22 will extend out of the valve rod 5 and be directly in contact with the high-temperature ash slag. Therefore, to ensure that the pipe cap 21 and the connecting pipe 22 are not damaged by the high-temperature ash slag, the slag poking rod 6 adopts a segmented connection structure. The pipe cap 21 and the connecting pipe 22 arranged close to the high-temperature ash slag are made of heat-resistant and wear-resistant cast superalloy to maintain a relatively high high-temperature strength, while the intermediate pipe joint 23, the steel pipe 24 and the tail pipe joint 25 arranged away from the high-temperature ash slag can be made of ordinary steel. This enables each section of the slag poking rod 6 to be made of different materials according to the specific working conditions, ensuring that the slag poking rod 6 can continuously operate under high-temperature and high-strength working conditions while greatly reducing the material cost of the slag poking rod 6. The segmented connection structure also facilitates the replacement of damaged components, avoiding overall replacement and reducing the replacement cost of the slag poking rod 6.

[0034] Further, as Figure 4As shown, the water-cooled valve stem 11 includes an outer tube 13, an intermediate tube 14, an inner tube 15, and a perforated end 16. One end of the outer tube 13 is fixed to the perforated end 16. The water-cooled valve stem 11 is embedded into the valve head 9 through the perforated end 16. The intermediate tube 14 is disposed inside the outer tube 13. A first cooling channel 17 is formed between the intermediate tube 14 and the outer tube 13. The inner tube 15 is disposed inside the intermediate tube 14. A second cooling channel 18 communicating with the first cooling channel 17 is formed between the inner tube 15 and the intermediate tube 14. A cooling water inlet 19 communicating with the first cooling channel 17 is formed on the outer wall of the outer tube 13. A cooling water outlet 20 communicating with the second cooling channel 18 is formed on the outer wall of the intermediate tube 14. One end of the inner tube 15 is fixed to the inner wall of the perforated end 16. The slag poking rod 6 is disposed inside the inner tube 15. The first cooling channel 17 and the second cooling channel 18 communicate at one end close to the perforated end 16. The cooling water inlet 19 is formed at one end of the outer tube 13 away from the perforated end 16. The cooling water outlet 20 is formed at one end of the intermediate tube 14 away from the perforated end 16, so that cooling water accumulates in the first cooling channel 17 and the second cooling channel 18. After the first cooling channel 17 and the second cooling channel 18 are filled with cooling water, it then flows out from the cooling water outlet 20, realizing the full cooling of the valve stem 5; the cooling water inlet 19 is disposed at the bottom of the outer tube 13, and the cooling water outlet 20 is disposed at the top of the intermediate tube 14, adopting a pure countercurrent mode, with uniform heat exchange, good cooling effect, and being safe and reliable.

[0035] Further, one end of the outer tube 13 away from the perforated end 16 is fixed to the first perforated end cap 27. The intermediate tube 14 passes through the first perforated end cap 27 and into the outer tube 13 and is fixed to the first perforated end cap 27. One end of the intermediate tube 14 away from the perforated end 16 is fixed to the second perforated end cap 28. The first perforated end cap 27 supports the intermediate tube 14 disposed inside the outer tube 13, and at the same time seals one end of the first cooling channel 17 away from the perforated end 16, so that the cooling water flows from one end of the first cooling channel 17 to the other end, and then flows into the second cooling channel 18. The inner tube 15 passes through the second perforated end cap 28 and into the intermediate tube 14 and is fixed to the second perforated end cap 28. The second perforated end cap 28 supports the inner tube 15 disposed inside the intermediate tube 14, and at the same time seals one end of the second cooling channel 18 away from the perforated end 16, so that the cooling water flows from one end of the second cooling channel 18 to the other end, and finally flows out from the cooling water outlet 20, so that the cooling water flows through each part of the valve stem 5 to achieve full cooling. A compressed air pipe 29 is communicated with the inner tube 15. Compressed air holes 30 communicating with the compressed air channel 7 are formed in the slag poking rod 6. There are two compressed air holes 30, and the two compressed air holes 30 are respectively arranged at both ends of the steel pipe 24. The compressed air pipe 29 is used to communicate with a compressed air device. The compressed air device can be a compressed air blower or an air pump, etc. The compressed air output by the compressed air device enters the gap between the inner tube 15 and the slag poking rod 6 through the compressed air pipe 29, so that the compressed air has two ways to flow into the boiler slag discharge port 1. One is that a part of the compressed air flows to the boiler slag discharge port 1 through the gap between the inner tube 15 and the slag poking rod 6. The other is that another part of the compressed air flows into the compressed air channel 7 through the compressed air holes 30 and is finally blown out from the purging holes 8, so that the compressed air enters the boiler slag discharge port 1 in a form of diffusing around, improving the purging effect. At the same time, during the process of purging the ash slag by the compressed air, the valve stem 5 and the slag poking rod 6 can also be air-cooled. Cooperating with the water-cooling method of the water-cooled valve stem 11, the cooling effect is improved, and the service life of the slag poking rod 6 and the valve stem 5 is prolonged. The flow of the compressed air between the slag poking rod 6 and the valve stem 5 also plays a sealing role, preventing the ash slag from entering the inside of the inner tube 15 and avoiding the deformation of the slag poking rod 6 affected by the high-temperature ash slag.

[0036] Further, a plurality of annular plates 26 are fixedly sleeved on the steel pipe 24, and graphite packing is filled between adjacent two annular plates 26. There are four annular plates 26, and they are grouped in pairs. The distance between each pair of annular plates 26 is 16 mm. Graphite packing is filled between the two annular plates 26 in each group, which is used to improve the sealing performance between the inner wall of the inner tube 15 and the outer wall of the steel pipe 24 and prevent the ash slag from entering and causing wear of the inner tube 15 and the slag poking rod 6. A washer and a graphite bearing are installed between the end of the water-cooled valve stem 11 close to the valve head 9 and the pipe cap 21, which are used to support the slag poking rod 6 and at the same time seal the gap formed between the outer wall of the slag poking rod 6 and the inner wall of the inner tube 15 to prevent the ash slag from entering.

[0037] Further, as Figure 5 shown, the valve stem drive device includes a lead screw 31, a valve stem connection seat 32, and a drive motor 33. One end of the lead screw 31 is rotatably connected to the valve body 4, and the other end is connected to the output shaft of the drive motor 33. The valve stem connection seat 32 is threadedly connected to the lead screw 31, and the valve stem connection seat 32 is fixedly sleeved on the outer tube 13. A flange 35 is provided at one end of the valve body 4 away from the valve seat 2. The flange 35 is provided with a through hole for the valve stem 5 to pass through. The lead screw 31 is rotatably connected to the flange 35 through a bearing provided on the flange 35. The drive motor 33 drives the lead screw 31 to rotate, thereby driving the valve stem connection seat 32 to move on the lead screw 31, and further driving the valve stem 5 to move within the valve body 4, realizing the opening, closing, or flow rate adjustment of the boiler slag discharge port 1.

[0038] Further, the slag poking drive device 34 adopts a cylinder or a linear reciprocating motor. The cylinder or the linear reciprocating motor drives the slag poking rod 6 to reciprocate back and forth within the valve stem 5 to complete the slag poking operation.

[0039] Further, a valve seat lining tube 36 is fixed to the inner wall of the boiler slag discharge port 1. The valve seat lining tube 36 is a high-temperature resistant and wear-resistant cast superalloy. The valve seat lining tube 36 is provided with a plurality of purging small holes along the circumferential direction. The purging small holes are communicated with the compressed air pipe 29 through an air pipe. When the boiler slag discharge port 1 is opened and closed through the valve stem 5, it is used to briefly purge the blocked material between the valve seat 2 and the valve head 9 to ensure that the conical valve head 9 is closed in place.

[0040] In summary, in the normal operating state of a conical ash control valve with an automatic slag poking function according to the present invention, the valve stem drive device drives the valve stem 5 to move, so that the valve head 9 withdraws from the boiler slag discharge port 1 and maintains a certain distance, which is matched with the size of the boiler slag discharge port 1 to ensure that all the ash and slag entering the ash control valve from the boiler slag discharge port can pass through without jamming. The axis of the ash control valve discharge port 3 forms an angle of about 45° with the valve stem. After the high-temperature slag comes out from the ash control valve discharge port 3, it enters the slag dropping pipe and then goes to subsequent slag cooling equipment and slag conveying equipment, as Figure 6 shown in the fully open position of the valve. When it is necessary to close the conical ash control valve, the valve stem drive device drives the valve stem 5 to move, and the head of the valve head 9 extends into the boiler slag discharge port 1, so that the conical surface of the valve head cooperates with the valve seat lining tube 36 to close the inlet of the ash control valve, as Figure 5 shown in the fully closed position of the valve.

[0041] When the slag discharge port 1 of the circulating fluidized bed boiler becomes blocked, the boiler operation control system activates the valve stem drive device of the conical ash control valve. The valve stem drive device drives the valve stem 5 to move, so that the valve head 9 is located 100 mm backward from the fully closed position. Then, the slag poking rod drive device is activated. The slag poking rod drive device drives the slag poking rod 6 to extend into the interior of the boiler slag discharge port through the valve head 9, and the material is agitated by reciprocating telescoping, so that the accumulated slag in the boiler slag discharge port 1 is loosened and separated or the large clinker is broken. At the same time, the compressed air holes on the slag poking rod cap 21 continuously blow the ash and slag near the boiler slag discharge port 1 to enhance the fluidity of the ash and slag. As Figure 1 shown in the slag poking position of the valve, automatic slag poking is realized, and the dredging is completed quickly and effectively. The compressed air at the slag poking rod cap 21 and the steel pipe 24 is set to be always open. In addition to blowing the ash and slag, it also plays a role in sealing and cooling, preventing the ash and slag from entering the interior of the valve stem 5 and reducing the deformation of the slag poking rod 6.

[0042] The above are only the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the concept described herein through the above teachings or the techniques or knowledge in related fields. And the changes and alterations made by those skilled in the art without departing from the spirit and scope of the present invention shall fall within the protection scope of the appended claims of the present invention.

Claims

1. A conical ash control valve with an automatic slag poking function, comprising a valve seat provided with a boiler slag discharge port and a valve body provided with an ash control valve discharge port. It is characterized in that it further includes a valve stem and a slag poking rod. The valve stem is slidably arranged in the valve body. The boiler slag discharge port is located on the moving path of the valve stem. The slag poking rod is arranged in the valve stem and can move along the axis of the valve stem. The slag poking rod crushes the bulk materials in the boiler slag discharge port by reciprocating telescoping. The slag poking rod is provided with a compressed air channel, and the head of the slag poking rod is provided with a plurality of purge holes communicating with the compressed air channel. The purge holes blow out compressed air to enhance the fluidity of the crushed materials. The slag poking rod includes a pipe cap, a connecting pipe, an intermediate pipe joint, a steel pipe and a tail pipe joint. The purge holes are opened on the pipe cap. The pipe cap is threadedly connected with the connecting pipe. The connecting pipe is detachably connected with the steel pipe through the intermediate pipe joint. One end of the steel pipe away from the connecting pipe is connected with the tail pipe joint. The tail pipe joint is connected with a slag poking driving device, and the slag poking driving device is used to drive the slag poking rod to do reciprocating linear motion. The valve stem includes a conical valve head and a water-cooled valve stem. One end of the water-cooled valve stem is embedded in the large-diameter end of the valve head, and the water-cooled valve stem and the valve head are tightly pressed and connected by heat-resistant high-strength bolts. The water-cooled valve stem is connected with a valve stem driving device. A flexible heat-conducting material is arranged between the water-cooled valve stem and the valve head. The flexible heat-conducting material is a material that simultaneously has heat-conducting characteristics and extensible and deformable characteristics. The water-cooled valve stem includes an outer pipe, an intermediate pipe, an inner pipe and a perforated end head. One end of the outer pipe is fixed to the perforated end head, and the water-cooled valve stem is embedded into the valve head through the perforated end head. The intermediate pipe is arranged in the outer pipe, and a first cooling channel is formed between the intermediate pipe and the outer pipe. The inner pipe is arranged in the intermediate pipe, and a second cooling channel communicating with the first cooling channel is formed between the inner pipe and the intermediate pipe. The outer wall of the outer pipe is provided with a cooling water inlet communicating with the first cooling channel. The outer wall of the intermediate pipe is provided with a cooling water outlet communicating with the second cooling channel. One end of the inner pipe is fixed to the inner wall of the perforated end head, and the slag poking rod is arranged in the inner pipe. One end of the outer pipe away from the perforated end head is fixed to a first perforated end cover. The intermediate pipe penetrates into the outer pipe from the first perforated end cover and is fixed to the first perforated end cover. One end of the intermediate pipe away from the perforated end head is fixed to a second perforated end cover. The inner pipe penetrates into the intermediate pipe from the second perforated end cover and is fixed to the second perforated end cover. A compressed air pipe is communicated with the inner pipe, and a compressed air hole communicating with the compressed air channel is opened on the slag poking rod.

2. A conical ash control valve with an automatic slag poking function according to claim 1, It is characterized in that The valve stem driving device includes a lead screw, a valve stem connecting seat, and a driving motor. One end of the lead screw is rotatably connected to the valve body, and the other end is connected to the output shaft of the driving motor. The valve stem connecting seat is threadedly connected to the lead screw, and the valve stem connecting seat is fixedly sleeved on the outer pipe.

3. A conical ash control valve with an automatic slag poking function according to claim 1, characterized in that A plurality of circular ring plates are fixedly sleeved on the steel pipe, and graphite packing is filled between two adjacent circular ring plates.

4. A conical ash control valve with an automatic slag poking function according to claim 1, characterized in that The slag poking driving device uses a cylinder or a linear reciprocating motor.

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