Preheating burner combined nozzle pipe with decoking mechanism

Abstract

The utility model relates to a preheating burner combined nozzle pipe with a decoking mechanism. In order to fill the blank in the prior art, the preheating burner combined nozzle pipe with the decoking mechanism comprises an inner pipe, an inner secondary air pipe, an outer secondary air pipe, an inner annular secondary air chamber, an outer annular secondary air chamber, an outer secondary air guide vane and an inner secondary air guide vane, and a movable flange plate is further sleeved on the outer pipe between the inner annular secondary air chamber and the outer annular secondary air chamber. A first expansion hose is arranged between the movable flange plate and the inner annular secondary air chamber, a second expansion hose is arranged between the movable flange plate and the outer annular secondary air chamber, and when the movable flange plate is pushed and pulled by external force, the front end of the inner secondary air pipe can be driven to stretch forwards to push coking blocks to be removed away from the front end of the inner pipe. The device is simple in structure and reliable in operation, can effectively prolong the operation period of the pulverized coal boiler with the preheating burner, and is suitable for being used by the pulverized coal boiler with the preheating burner.

Description

Technical Field

[0001] The utility model relates to a combined nozzle pipe of a preheating burner with a coke cleaning mechanism. Background Art

[0002] The existing pulverized coal boiler includes a boiler and a preheating burner. Powdered fuel such as pulverized coal first enters the preheating burner and is not fully burned with air to produce part of the coal gas. The released heat preheats the remaining coal powder and air. The preheated mixed fuel gas contains coal gas, air and unburned coal powder. After passing through the preheating burner nozzle pipe, the mixed fuel gas enters the boiler for full combustion. When the mixed fuel gas passes through the preheating burner nozzle pipe, it is easy to generate coke blocks in the preheating burner nozzle pipe inside the boiler, blocking the feeding of the pulverized coal boiler.

[0003] To solve this problem, Figure 1-3 As shown, the existing pulverized coal boiler preheating burner adopts a combined nozzle pipe, which includes an inner pipe 1, an inner secondary air duct 2, an outer secondary air duct 3, an inner annular secondary air chamber 4, an outer annular secondary air chamber 5, an outer secondary air guide vane 6 and an inner secondary air guide vane 7. The front end of the inner pipe 1 passes through the furnace wall 8 of the pulverized coal boiler and passes into its furnace 9. The rear end of the inner pipe 1 is connected to the top of the preheating burner 10. The inner annular secondary air chamber 4 and the inner secondary air duct 5 are sleeved on the inner pipe. The front end of the inner secondary air duct 2 passes through the furnace wall 8 of the pulverized coal boiler and passes into its furnace 9. The rear end of the inner secondary air duct 2 is connected to the inner annular secondary air chamber 4; The annular secondary air chamber 5 and the outer secondary air duct 3 are sleeved on the inner secondary air duct 2, the front end of the outer secondary air duct 3 passes through the furnace wall 8 of the pulverized coal boiler and leads into its furnace 9, the rear end of the outer secondary air duct 3 is connected with the outer annular secondary air chamber 5, the inner annular secondary air chamber 4 is provided with an inner secondary air interface 11, the outer annular secondary air chamber 5 is provided with an outer secondary air interface 12, a refractory lining 13 is attached to the inner wall of the inner tube 1, the outer secondary air guide vane 6 is arranged in the annular space between the outer secondary air duct 3 and the inner secondary air duct 2, and the inner secondary air guide vane 7 is arranged in the annular space between the inner secondary air duct 2 and the inner tube 1.

[0004] With this design, air is introduced into the nozzle of the preheating burner through the inner secondary air duct and the outer secondary air duct, and the air is preheated through the inner tube and the inner secondary air duct before meeting the mixed fuel gas, so the coking at the nozzle can be reduced. However, reducing does not mean eliminating. After the existing pulverized coal boiler has been used for a period of time, coking blocks will still appear at the nozzle of the preheating burner, blocking the feeding. The existing technology lacks effective online cleaning technology for the coking blocks at the nozzle of the preheating burner, and can only be cleaned when the pulverized coal boiler is shut down for maintenance. Summary of the invention

[0005] The technical problem to be solved by the utility model is how to fill the above-mentioned gap in the prior art and provide a preheating burner combined nozzle pipe with a coke cleaning mechanism.

[0006] In order to solve the above technical problems, the combined nozzle pipe of the preheating burner with a coke cleaning mechanism comprises an inner pipe, an inner secondary air pipe, an outer secondary air pipe, an inner annular secondary air chamber, an outer annular secondary air chamber, an outer secondary air guide vane and an inner secondary air guide vane. The front end of the inner pipe passes through the furnace wall of the pulverized coal boiler and enters its furnace. The rear end of the inner pipe is connected to the top of the preheating burner. The inner annular secondary air chamber and the inner secondary air pipe are sleeved on the inner pipe. The front end of the inner secondary air pipe passes through the furnace wall of the pulverized coal boiler and enters its furnace. The rear end of the inner secondary air duct is connected with the inner annular secondary air chamber; the outer annular secondary air chamber and the outer secondary air duct are sleeved on the inner secondary air duct, the front end of the outer secondary air duct passes through the furnace wall of the pulverized coal boiler and enters its furnace, the rear end of the outer secondary air duct is connected with the outer annular secondary air chamber, the inner annular secondary air chamber is provided with an inner secondary air interface, the outer annular secondary air chamber is provided with an outer secondary air interface, a refractory lining is attached to the inner wall of the inner tube, and the outer secondary air guide vane is arranged between the outer secondary air duct and the inner secondary air duct The inner secondary air guide vane is arranged in the annular space between the inner secondary air duct and the inner tube, and is characterized in that: a movable flange is also sleeved on the outer tube between the inner annular secondary air chamber and the outer annular secondary air chamber, a first expansion hose is arranged between the movable flange and the inner annular secondary air chamber, a second expansion hose is arranged between the movable flange and the outer annular secondary air chamber, flanges are connected to both ends of the first expansion hose and the second expansion hose, the flanges at both ends of the first expansion hose are respectively fixed to the inner annular secondary air chamber and the movable flange by screws or bolts, the flanges at both ends of the second expansion hose are respectively fixed to the movable flange and the outer annular secondary air chamber by screws or bolts, the outer secondary air guide vane is fixed to the inner wall of the outer secondary air duct and is not connected to the inner secondary air duct; the inner secondary air guide vane is fixed to the inner secondary air duct and is not connected to the inner tube, and when the movable flange is pushed or pulled by external force, it can drive the front end of the inner secondary air duct to extend forward, and push the coke block to be removed away from the front end of the inner tube. The second expansion hose, the first expansion hose is made of flexible refractory material, such as refractory cloth.

[0007] With such a design, according to the coking rate during the use of the boiler (mainly affected by the content of impurities such as tar in the fuel pulverized coal), every few days or weeks, the movable flange is pushed manually or with the help of a cylinder, an oil cylinder or an electric push rod, so as to drive the inner secondary air duct to extend forward, so that its front end extends into the furnace, and the coke blocks are pushed away from the nozzle of the inner tube, or are burned or fall to the bottom of the boiler, thereby eliminating the coke blocks at the nozzle that affect the feeding.

[0008] As an optimization, a tension spring is connected to the top of the movable flange, and the other end of the tension spring is fixed to the upper outside of the movable flange (i.e., the top of the tension spring is fixed and tilted away from the pulverized coal boiler). This design can offset the gravity of the movable flange and prevent the movable flange from being affected by gravity and bending the first expansion hose and the second expansion hose (the internal secondary air has sufficient wind pressure, and most of the expansion hoses are also equipped with supports, so the first expansion hose and the second expansion hose will not be crushed).

[0009] As an optimization, parallel guide rods are fixed on both sides of the first expansion hose and the second expansion hose, and two guide tubes are provided on the movable flange. The two guide tubes are respectively sleeved on the parallel guide rods and can move forward and backward on the parallel guide rods. The axis lines of the two parallel guide rods are parallel to the axis line of the inner tube. With such a design, the parallel guide rods can ensure that when the movable flange and the inner secondary air duct move forward and backward, they always move forward and backward along the axis line of the inner tube, and the movement resistance is small.

[0010] As an optimization, a spiral return spring is also sleeved on the parallel guide rod, the front end of the spiral return spring is fixed, and the rear end thereof abuts against the movable flange (the end close to the boiler is the front, and the other end is the rear). This design facilitates the automatic return of the movable flange and the internal secondary air duct.

[0011] As an optimization, it also includes an electric push rod, two upper fixed pulleys and a plurality of steering pulleys, the two upper fixed pulleys are fixed on both sides of the second expansion hose, one end of the electric push rod is fixed, and the other end is connected to a wire rope, the other end of the wire rope crosses each steering pulley and is connected to two support wire ropes, the other ends of the two support wire ropes cross the two upper fixed pulleys and are connected to the movable flange. See CN 2315706Y for the electric push rod. Such a design has a simple structure, and the electric push rod can be manually or automatically started to shrink the rod body, which can drive the movable flange and the inner secondary air duct to extend forward, completing the pipe mouth decoking process, the electric push rod rotates in the opposite direction, the rod body extends forward, and the movable flange and the inner secondary air duct are reset manually or under the action of the reset spring.

[0012] As an optimization, it also includes an electric push rod, two upper fixed pulleys and several steering pulleys, the two upper fixed pulleys are fixed on both sides of the second expansion hose, one end of the electric push rod is fixed, and the other end is connected to a steel wire rope, the other end of the steel wire rope crosses each steering pulley and is connected to two branch steel wire ropes, the other ends of the two branch steel wire ropes respectively cross the two upper fixed pulleys and are connected to the movable flange, and the connection points of the two steel wire ropes and the movable flange are located on a horizontal plane passing through the axis of the inner tube, the projections of the two branch steel wire ropes on the horizontal plane are symmetrical, and the two upper fixed pulleys are respectively located above and below the horizontal plane.

[0013] With such design, two support steel ropes are one up and one down, and there is no restriction of parallel guide rods. The pulling force applied to the movable flange by the support steel ropes will also generate a steering component force, which will push the movable flange and the inner secondary air duct forward and cause a certain twisting of the inner secondary air duct, making it more effective in clearing the coke from the pipe mouth.

[0014] As an optimization, parallel driving parts are respectively provided on both sides of the movable flange, one end of the parallel driving part is fixed, and the other end is connected to the movable flange. The parallel driving part is a driving cylinder or a driving oil cylinder or an electric push rod, and its axis is parallel to the axis of the inner tube, and the two parallel driving parts are synchronously extended and retracted. Such a design has a simple structure and small footprint, but the two parallel driving parts must act synchronously, and the ambient temperature of the driving cylinder or the driving oil cylinder or the electric push rod is high, which affects the high temperature and damages the lubrication and life.

[0015] The utility model discloses a preheating burner combined nozzle tube with a decoking mechanism, which has a simple structure, reliable operation and obvious tube mouth decoking effect, greatly prolongs the operation cycle of the pulverized coal boiler with a preheating burner, avoids the shutdown and maintenance caused simply by coking at the tube mouth of the preheating burner combined nozzle tube, and is suitable for use in pulverized coal boilers with preheating burners. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following is a further description of the combined nozzle pipe of the preheating burner with a coke cleaning mechanism of the utility model in conjunction with the accompanying drawings:

[0017] Figure 1 It is a partial main structural schematic diagram of an existing pulverized coal boiler after the preheating burner is removed (the combined nozzle pipe of the preheating burner is retained);

[0018] Figure 2 It is a schematic diagram of the cross-sectional structure of an existing pulverized coal boiler (a plane section along the axis of the inner tube);

[0019] Figure 3 yes Figure 2 The schematic diagram of the partially enlarged structure of the A-A section of the pulverized coal boiler shown;

[0020] Figure 4 This is a partial enlarged cross-sectional structural diagram of the preheating burner combined nozzle pipe with a decoking mechanism in the first embodiment of the present invention in the use state (the cutting position and angle are the same as those in the embodiment of the present invention). Figure 3 );

[0021] Figure 5 This Figure 4 The partial enlarged structural diagram of the B-B section of the pulverized coal boiler shown in the figure (the sectioning position and angle are the same as Figure 1 );

[0022] Figure 6This is a schematic diagram of the structure of the pulley + electric push rod type driving device in the first embodiment of the preheating burner combined nozzle pipe with a coke cleaning mechanism;

[0023] Figure 7 This is a structural schematic diagram of the third implementation mode of the combined nozzle pipe of the preheating burner with a decoking mechanism;

[0024] Figure 8 yes Figure 7 The schematic diagram of the structure of the combined nozzle pipe of the preheating burner with a decoking mechanism is shown.

[0025] In the figure: 1 is an inner tube, 2 is an inner secondary air duct, 3 is an outer secondary air duct, 4 is an inner annular secondary air chamber, 5 is an outer annular secondary air chamber, 6 is an outer secondary air guide vane, 7 is an inner secondary air guide vane, 8 is a furnace wall of a pulverized coal boiler, 9 is a furnace, 10 is a preheating burner, 11 is an inner secondary air interface, 12 is an outer secondary air chamber interface, 13 is a refractory lining, 14 is a movable flange, 15 is a first expansion hose, 16 is a second expansion hose, 17 is a flange, 18 is a screw or bolt, 19 is a tension spring, 20 is an electric push rod, 201 is a rod body of the electric push rod 20, 202 is an outer tube of the electric push rod 20, 21 is an upper fixed pulley, 22 is a steering pulley, 23 is a steel wire rope, 24 is a supporting steel wire rope, 25 is a parallel guide rod, 26 is a guide pipe, and 27 is a spiral return spring. DETAILED DESCRIPTION

[0026] Implementation method 1: Figure 4 , 5As shown, the combined nozzle pipe of the preheating burner with a coke cleaning mechanism comprises an inner pipe 1, an inner secondary air pipe 2, an outer secondary air pipe 3, an inner annular secondary air chamber 4, an outer annular secondary air chamber 5, an outer secondary air guide vane 6 and an inner secondary air guide vane 7. The front end of the inner pipe 1 passes through the furnace wall 8 of the pulverized coal boiler and passes into the furnace 9 thereof. The rear end of the inner pipe 1 is connected to the top of the preheating burner 10. The inner annular secondary air chamber 4 and the inner secondary air pipe 2 are sleeved on the inner pipe. The front end of the inner secondary air pipe 2 passes through the furnace wall 8 of the pulverized coal boiler and passes into the furnace 9 thereof. The rear end of the inner secondary air pipe 2 is connected to the top of the preheating burner 10. The inner annular secondary air chamber 4 is connected; the outer annular secondary air chamber 5 and the outer secondary air duct 3 are sleeved on the inner secondary air duct 2, the front end of the outer secondary air duct 3 passes through the furnace wall 8 of the pulverized coal boiler and passes into its furnace 9, the rear end of the outer secondary air duct 3 is connected with the outer annular secondary air chamber 5, the inner annular secondary air chamber 4 is provided with an inner secondary air interface 11, the outer annular secondary air chamber 5 is provided with an outer secondary air interface 12, a refractory lining 13 is attached to the inner wall of the inner tube 1, the outer secondary air guide vane 6 is arranged in the annular space between the outer secondary air duct 3 and the inner secondary air duct 2, the inner two The secondary air guide blade 7 is arranged in the annular space between the inner secondary air duct 2 and the inner tube 1, and is characterized in that: a movable flange 14 is also sleeved on the inner tube 1 between the inner annular secondary air chamber 4 and the outer annular secondary air chamber 5, a first expansion hose 15 is arranged between the movable flange 14 and the inner annular secondary air chamber 4, a second expansion hose 16 is arranged between the movable flange 14 and the outer annular secondary air chamber 5, and flanges 17 are respectively connected at both ends of the first expansion hose 15 and the second expansion hose 16, and the flanges 17 at both ends of the first expansion hose 15 are respectively connected by screws or bolts 18 Fixed on the inner annular secondary air chamber 4 and the movable flange 14, the flanges 17 at both ends of the second expansion hose 16 are fixed on the movable flange 14 and the outer annular secondary air chamber 5 respectively by screws or bolts 18, the outer secondary air guide blades 6 are fixed on the inner wall of the outer secondary air duct 3, and are not connected to the inner secondary air duct 2; the inner secondary air guide blades 7 are fixed on the inner wall of the inner secondary air duct 2, and are not connected to the inner tube 1. When the movable flange 14 is pushed or pulled by external force, it can drive the front end of the inner secondary air duct 2 to extend forward, and push the coke blocks to be removed away from the front end of the inner tube 1.

[0027] A tension spring 19 is connected to the top of the movable flange 14, and the other end of the tension spring 19 is fixed to the outer upper part of the movable flange 14 (that is, the top end of the tension spring 19 is fixed and tilted away from the pulverized coal boiler).

[0028] like Figure 6As shown, it also includes an electric push rod 20, two upper fixed pulleys 21 and a plurality of steering pulleys 22. The two upper fixed pulleys 22 are fixed on both sides of the second expansion hose 16. One end of the electric push rod 20 (such as the root of the rod body 201 of the electric push rod 20) is fixed, and the other end (such as the front end of the outer tube 202 of the electric push rod 20) is connected to a steel wire rope 23. The other end of the steel wire rope 23 (sequentially) crosses each steering pulley 22 and is connected to two branch steel wire ropes 24. The other ends of the two branch steel wire ropes 24 cross the two upper fixed pulleys 21 respectively and are connected to the movable flange 14 to form a pulley + electric push rod type drive device of the movable flange 14.

[0029] Embodiment 2: The connection points of the two steel wire ropes 24 and the movable flange 14 are located on a horizontal plane passing through the axis of the inner tube 1. The projections of the two steel wire ropes 24 on the horizontal plane are symmetrical. The two upper fixed pulleys 21 are respectively located above and below the horizontal plane. The remaining structures are as shown in Embodiment 1 and are not shown in the figure.

[0030] Implementation method three: Figure 7-8 As shown, parallel guide rods 25 are fixed on both sides of the first expansion hose 15 and the second expansion hose 16, and two guide tubes 26 are provided on the movable flange 14. The two guide tubes 26 are respectively sleeved on the parallel guide rods 25 and can move forward and backward on the parallel guide rods 25. The axis lines of the two parallel guide rods 25 are parallel to the axis line of the inner tube 1. The parallel guide rods 25 are also sleeved with a spiral return spring 27, the front end of the spiral return spring 27 is fixed, and the rear end thereof abuts against the movable flange 14 (the end close to the boiler is the front end, and the other end is the rear end). The rest of the structure is shown in the first embodiment, and the figure is omitted.

[0031] Embodiment 4: Parallel driving members are respectively provided on both sides of the movable flange 14, one end of the parallel driving member is fixed, and the other end is connected to the movable flange 14. The parallel driving member is a driving cylinder or a driving oil cylinder or an electric push rod, and its axis is parallel to the axis of the inner tube 1. The two parallel driving members extend and retract synchronously. The remaining structures are shown in embodiment 1 and are not shown in the figure.

Claims

1. A preheating burner combined nozzle pipe with a coke cleaning mechanism, comprising an inner pipe, an inner secondary air duct, an outer secondary air duct, an inner annular secondary air chamber, an outer annular secondary air chamber, an outer secondary air guide vane and an inner secondary air guide vane, the front end of the inner pipe passes through the furnace wall of a pulverized coal boiler and passes into the furnace thereof, the rear end of the inner pipe is connected with the top of the preheating burner, the inner annular secondary air chamber and the inner secondary air duct are sleeved on the inner pipe, the front end of the inner secondary air duct passes through the furnace wall of a pulverized coal boiler and passes into the furnace thereof, the rear end of the inner secondary air duct is connected with the inner annular secondary air chamber; the outer annular The secondary air chamber and the outer secondary air duct are sleeved on the inner secondary air duct, the front end of the outer secondary air duct passes through the furnace wall of the pulverized coal boiler and enters the furnace, the rear end of the outer secondary air duct is connected with the outer annular secondary air chamber, the inner annular secondary air chamber is provided with an inner secondary air interface, the outer annular secondary air chamber is provided with an outer secondary air interface, a refractory lining is attached to the inner wall of the inner tube, the outer secondary air guide vane is arranged in the annular space between the outer secondary air duct and the inner secondary air duct, the inner secondary air guide vane is arranged in the annular space between the inner secondary air duct and the inner tube, and the characteristics are: A movable flange is also provided on the outer tube between the inner annular secondary air chamber and the outer annular secondary air chamber, a first expansion hose is provided between the movable flange and the inner annular secondary air chamber, a second expansion hose is provided between the movable flange and the outer annular secondary air chamber, flanges are connected to both ends of the first expansion hose and the second expansion hose respectively, the flanges at both ends of the first expansion hose are respectively fixed to the inner annular secondary air chamber and the movable flange by screws or bolts, the flanges at both ends of the second expansion hose are respectively fixed to the movable flange and the outer annular secondary air chamber by screws or bolts, the outer secondary air guide blades are fixed to the inner wall of the outer secondary air duct and are not connected to the inner secondary air duct; the inner secondary air guide blades are fixed to the inner secondary air duct and are not connected to the inner tube, when the movable flange is pushed or pulled by external force, the front end of the inner secondary air duct can be driven to extend forward, pushing the coke blocks to be removed away from the front end of the inner tube.

2. The preheating burner combined nozzle pipe with a decoking mechanism according to claim 1 is characterized in that: The top of the movable flange is connected with a tension spring, and the other end of the tension spring is fixed on the outer upper part of the movable flange.

3. The preheating burner combined nozzle pipe with a decoking mechanism according to claim 1 is characterized in that: Parallel guide rods are fixed on both sides of the first expansion hose and the second expansion hose respectively. Two guide tubes are arranged on the movable flange. The two guide tubes are respectively sleeved on the parallel guide rods and can move forward and backward on the parallel guide rods. The axis lines of the two parallel guide rods are parallel to the axis line of the inner tube.

4. The preheating burner combined nozzle pipe with a decoking mechanism according to claim 3 is characterized in that: The parallel guide rod is also sleeved with a spiral return spring, the front end of the spiral return spring is fixed, and the rear end thereof abuts against the movable flange.

5. The preheating burner combined nozzle pipe with a decoking mechanism according to any one of claims 1 to 4, characterized in that: It also includes an electric push rod, two upper fixed pulleys and a plurality of steering pulleys. The two upper fixed pulleys are fixed on both sides of the second expansion hose. One end of the electric push rod is fixed, and the other end is connected to a steel wire rope. The other end of the steel wire rope passes over each steering pulley and is connected to two branch steel wire ropes. The other ends of the two branch steel wire ropes pass over the two upper fixed pulleys respectively and are connected to the movable flange.

6. The preheating burner combined nozzle pipe with a decoking mechanism according to claim 1 or 2, characterized in that: It also includes an electric push rod, two upper fixed pulleys and a plurality of steering pulleys, the two upper fixed pulleys are fixed on both sides of the second expansion hose, one end of the electric push rod is fixed, and the other end is connected to a steel wire rope, the other end of the steel wire rope passes over each steering pulley and is connected to two branch steel wire ropes, the other ends of the two branch steel wire ropes respectively pass over the two upper fixed pulleys and are connected to the movable flange, and the connection points of the two branch steel wire ropes and the movable flange are located on a horizontal plane passing through the axis line of the inner tube, the projections of the two branch steel wire ropes on the horizontal plane are symmetrical, and the two upper fixed pulleys are respectively located above and below the horizontal plane.

7. The preheating burner combined nozzle pipe with a decoking mechanism according to any one of claims 1 to 4, characterized in that: A parallel driving member is provided on both sides of the movable flange, one end of which is fixed and the other end is connected to the movable flange. The parallel driving member is a driving cylinder or a driving oil cylinder or an electric push rod, and its axis is parallel to the axis of the inner tube. The two parallel driving members extend and retract synchronously.

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