Fly ash reduction treatment device for circulating fluidized bed boiler

Abstract

The invention discloses a fly ash reduction processing device for a circulating fluidized bed boiler, aiming to provide a fly ash reduction processing device for a circulating fluidized bed boiler, which can timely discharge the ash at the bottom of the returner without affecting the normal operation of the returner of the circulating fluidized bed boiler, thereby reducing the fly ash yield. The device comprises an ash discharge port, which is arranged at the bottom of the returner of the circulating fluidized bed boiler; an ash discharge pipe; an intermittent ash discharge opening and closing device, which comprises a reset spring, a switching cylinder with closed upper and lower ends, a vertical upper cylinder arranged at the upper end of the switching cylinder, an upper piston for cooperating with the vertical upper cylinder, a vertical lower cylinder arranged at the lower end of the switching cylinder, a lower piston for cooperating with the vertical lower cylinder, a vertical connecting rod connecting the upper piston and the lower piston, an ash receiving plate arranged in the switching cylinder through a horizontal rotating shaft, the upper end of the ash discharge pipe is connected to the ash discharge port, and the lower end of the ash discharge pipe is connected to the upper end of the vertical upper cylinder.

Description

Technical Field

[0001] The invention relates to a fly ash treatment device for a circulating fluidized bed boiler, in particular to a fly ash reduction treatment device for a circulating fluidized bed boiler. Background Art

[0002] Ash is easily accumulated at the turning angle at the bottom of the returner of the circulating fluidized bed boiler. These ashes need to be discharged and cleaned frequently, otherwise the ashes will enter the combustion chamber for the second time, which will increase the fly ash yield of the circulating fluidized bed boiler. The returner of the traditional circulating fluidized bed boiler is provided with a manual return port. The operator lifts up and opens the manual return port to clean the bottom of the returner. The operation is inconvenient and the ash at the bottom of the returner cannot be cleaned in time, which will increase the fly ash yield of the circulating fluidized bed boiler. In order to facilitate operation, the return port on the returner of the current circulating fluidized bed boiler is provided with an electric valve, which is used to control the opening and closing of the return port. Although it facilitates the cleaning operation at the bottom of the returner, on the one hand, it still needs to manually control the electric valve for ash discharge. On the other hand, due to the high ambient temperature of the circulating fluidized bed boiler, the electronic components of the electric valve are easily damaged, resulting in failure of the electric valve. Summary of the invention

[0003] The purpose of the present invention is to provide a fly ash reduction treatment device for a circulating fluidized bed boiler, which can discharge ash at the bottom of a returner in time without affecting the normal operation of the returner of the circulating fluidized bed boiler, thereby reducing the fly ash yield.

[0004] The technical solution of the present invention is:

[0005] A fly ash reduction treatment device for a circulating fluidized bed boiler, comprising:

[0006] An ash discharge port, which is arranged at the bottom of the return feeder of the circulating fluidized bed boiler;

[0007] Ash discharge pipe;

[0008] An intermittent ash unloading opening and closing device comprises a reset spring, a switching cylinder closed at both ends, a vertical upper cylinder arranged at the upper end of the switching cylinder, an upper piston for cooperating with the vertical upper cylinder, a vertical lower cylinder arranged at the lower end of the switching cylinder, a lower piston for cooperating with the vertical lower cylinder, a vertical connecting rod connecting the upper piston and the lower piston, an ash receiving plate arranged in the switching cylinder by rotating a horizontal rotating shaft, an ash receiving plate support arranged on the inner wall of the switching cylinder and a push rod connected to the vertical connecting rod, the upper end of the ash unloading pipe is connected to the ash unloading port, the lower end of the ash unloading pipe is connected to the upper end of the vertical upper cylinder, a connecting rod passing port is provided on the ash receiving plate, the vertical connecting rod passes through the connecting rod passing port, the push rod is located below the ash receiving plate, and the reset spring is used to provide elastic force to move the upper piston and the lower piston upward. The return feeder of the circulating fluidized bed boiler of the present invention can discharge the ash at the bottom of the return feeder in a timely manner without affecting the normal operation of the return feeder of the circulating fluidized bed boiler, thereby reducing the fly ash yield.

[0009] Preferably, the intermittent ash unloading opening and closing device also includes a limit plate arranged on the outer wall of the vertical upper cylinder, a vertical guide sleeve arranged at the upper end of the adapter cylinder, a vertical guide rod sliding along the vertical guide sleeve, an upper end plate arranged at the upper end of the vertical guide rod, and a limit block arranged on the vertical guide rod and located above the vertical guide sleeve, the limit plate is located above the upper end plate, the lower end of the vertical guide rod is connected to the vertical connecting rod through a radial connecting rod, the lower end of the reset spring abuts against the upper end of the adapter cylinder, and the upper end of the reset spring abuts against On the upper end plate, the upper end plate is pressed against the limit plate under the action of the return spring. When the upper end plate is pressed against the limit plate, the lower piston is located in the adapter tube and separated from the vertical lower cylinder, the upper piston is located in the vertical upper cylinder, the push rod is pressed against the lower surface of the ash receiving plate and makes the ash receiving plate inclined; when the limit block is pressed against the upper end of the vertical guide sleeve, the upper piston is located in the adapter tube and separated from the vertical upper cylinder, the lower piston is located in the vertical lower cylinder, and the ash receiving plate is pressed against the ash receiving plate support under the action of its own weight.

[0010] Preferably, the upper end plate is an iron plate, and the limit plate is provided with a magnet for adsorbing the upper end plate. Thus, when the upper end plate abuts against the limit plate, the upper end plate can be adsorbed by the magnet.

[0011] Preferably, the center of gravity of the ash receiving plate, the vertical connecting rod, the top rod and the ash receiving plate support are located on the same side of the horizontal rotating shaft.

[0012] Preferably, the upper end surface of the upper piston is provided with a conical protrusion. Thus, when the upper piston is located in the adapter tube and separated from the vertical upper cylinder tube, the ash residue above the upper piston can fall downward into the adapter tube to prevent the ash residue from gathering at the upper end of the upper piston.

[0013] Preferably, the upper end surface of the lower piston is also provided with a conical protrusion. In this way, when the lower piston is located in the adapter tube and separated from the vertical lower cylinder barrel, it is beneficial to make the ash above the lower piston fall down into the vertical lower cylinder barrel to avoid the ash from gathering at the upper end of the lower piston.

[0014] Preferably, the lower end of the adapter tube is provided with a tapered connecting tube whose inner diameter decreases from top to bottom, and the upper end of the vertical lower cylinder is connected to the tapered connecting tube. In this way, the ash in the lower end of the adapter tube can be smoothly output to the vertical lower cylinder through the tapered connecting tube, avoiding the ash from accumulating at the lower end of the adapter tube.

[0015] Preferably, it further comprises an ash conveying belt and a screw conveyor, the screw conveyor comprises a feed port and a discharge port, the vertical lower cylinder is connected to the feed port, and the discharge port is located above the ash conveying belt. In this way, the ash in the vertical lower cylinder can be conveyed to the ash conveying belt by the screw conveyor, and then transported away by the ash conveying belt.

[0016] Preferably, the screw conveyor is a water-cooled screw conveyor. In this way, the ash can be cooled during transportation in the screw conveyor, so as to avoid the ash delivered to the ash conveyor belt being too hot and causing safety hazards.

[0017] Preferably, it further comprises an ash discharge pipe, the upper end of which is connected to the discharge port, and the lower end of which is located above the ash conveying belt.

[0018] The beneficial effect of the present invention is that the ash at the bottom of the returner can be discharged in time without affecting the normal operation of the returner of the circulating fluidized bed boiler, thereby reducing the fly ash yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a fly ash reduction processing device for a circulating fluidized bed boiler of the present invention.

[0020] Figure 2 yes Figure 1 Side view of.

[0021] Figure 3 It is a cross-sectional structural schematic diagram of the intermittent ash unloading opening and closing device of the present invention.

[0022] In the figure:

[0023] Return device 1;

[0024] Ash discharge port 2;

[0025] Ash discharge pipe 3;

[0026] Intermittent ash unloading opening and closing device 4, reset spring 4.0, adapter cylinder 4.1, vertical upper cylinder 4.2, upper piston 4.3, vertical lower cylinder 4.4, lower piston 4.5, vertical connecting rod 4.6, horizontal rotating shaft 4.7, ash receiving plate 4.8, connecting rod port 4.9, ash receiving plate support 4.10, push rod 4.11, vertical guide sleeve 4.12, vertical guide rod 4.13, limit block 1.14, radial connecting rod 4.15, upper end plate 4.16, limit plate 4.17, magnet 4.18;

[0027] Screw conveyor 5;

[0028] Ash discharge pipe 6;

[0029] Ash conveying belt 7. DETAILED DESCRIPTION

[0030] Specific embodiment 1: Figure 1 , Figure 2 , Figure 3 As shown, a fly ash reduction treatment device for a circulating fluidized bed boiler comprises an ash discharge port 2, an ash discharge pipe 3 and an intermittent ash discharge opening and closing device 4. The ash discharge port is arranged at the bottom of a return feeder 1 of the circulating fluidized bed boiler. The ash discharge port is connected to the bottom of the inner cavity of the return feeder.

[0031] The intermittent ash unloading opening and closing device 4 includes a reset spring 4.0, a switching cylinder 4.1 with closed upper and lower ends, a vertical upper cylinder 4.2 arranged at the upper end of the switching cylinder, an upper piston 4.3 for cooperating with the vertical upper cylinder, a vertical lower cylinder 4.4 arranged at the lower end of the switching cylinder, a lower piston 4.5 for cooperating with the vertical lower cylinder, a vertical connecting rod 4.6 connecting the upper piston and the lower piston, an ash receiving plate 4.8 rotatably arranged in the switching cylinder through a horizontal rotating shaft 4.7, an ash receiving plate support 4.10 arranged on the inner wall of the switching cylinder, a push rod 4.11 connected to the vertical connecting rod, a limit plate 4.17 fixedly arranged on the outer wall of the vertical upper cylinder, a vertical guide sleeve 4.12 arranged at the upper end of the switching cylinder, a vertical guide rod 4.13 sliding along the vertical guide sleeve, an upper end plate 4.16 arranged at the upper end of the vertical guide rod, and a limit block 1.14 arranged on the vertical guide rod and located above the vertical guide sleeve.

[0032] The position of the intermittent ash unloading opening and closing device is lower than the position of the ash unloading port. The upper end of the ash unloading pipe is connected to the ash unloading port, and the lower end of the ash unloading pipe is connected to the upper end of the vertical upper cylinder. The inner diameter of the adapter tube is larger than the inner diameter of the vertical upper cylinder, and the inner diameter of the adapter tube is larger than the inner diameter of the vertical lower cylinder. In this embodiment, the lower end of the adapter tube is provided with a tapered connecting tube whose inner diameter decreases from top to bottom. The upper end of the vertical lower cylinder is connected to the tapered connecting tube. The vertical lower cylinder is coaxially distributed with the vertical upper cylinder, and the inner diameter of the vertical lower cylinder is the same as that of the vertical upper cylinder.

[0033] The ash receiving plate is located between the upper piston and the lower piston, and the projection of the upper piston in the vertical direction falls on the ash receiving plate. The ash receiving plate is circular. The outer diameter of the ash receiving plate is larger than the outer diameter of the upper piston. The ash receiving plate is provided with a connecting rod opening 4.9. The vertical connecting rod passes through the connecting rod opening. The top rod is parallel to the vertical connecting rod, and the top rod is connected to the vertical connecting rod through a connecting piece. The top rod is located below the ash receiving plate. The ash receiving plate support is located below the ash receiving plate. The center of gravity of the ash receiving plate, the vertical connecting rod, the top rod and the ash receiving plate support are located on the same side of the horizontal rotating shaft.

[0034] The limit plate is located above the upper end plate. In this embodiment, the limit plate is a horizontally distributed annular limit plate, the upper end plate is a horizontally distributed annular upper end plate, the upper end plate is an iron plate, and a magnet 4.18 for adsorbing the upper end plate is provided on the limit plate. The lower end of the vertical guide rod is connected to the vertical connecting rod through a radial connecting rod 4.15, and the radial connecting rod is in a water distribution. The radial connecting rod is located in the adapter tube.

[0035] In this embodiment, the return spring, the upper end plate, the limit plate and the magnet are all located on the outer side of the vertical upper cylinder.

[0036] When the lower piston is located in the adapter tube and separated from the vertical lower cylinder barrel, the upper piston is located in the vertical upper cylinder barrel. When the upper piston is located in the adapter tube and separated from the vertical upper cylinder barrel, the lower piston is located in the vertical lower cylinder barrel.

[0037] like Figure 3 As shown, the return spring is used to provide elastic force to move the upper piston and the lower piston upward. In this embodiment, the return spring is sleeved on the vertical upper cylinder barrel, the lower end of the return spring abuts against the upper end of the adapter barrel, and the upper end of the return spring abuts against the upper end plate.

[0038] like Figure 3 As shown, the upper end plate abuts against the limit plate under the action of the return spring. When the upper end plate abuts against the limit plate, the lower piston is located in the adapter cylinder and is separated from the vertical lower cylinder, the upper piston is located in the vertical upper cylinder, the push rod abuts against the lower surface of the ash receiving plate and makes the ash receiving plate inclined, and the magnet adsorbs the upper end plate on the limit plate.

[0039] When the limit block abuts against the upper end of the vertical guide sleeve, the upper piston is located in the adapter cylinder and separated from the vertical upper cylinder, the lower piston is located in the vertical lower cylinder, the ash receiving plate abuts against the ash receiving plate support under the action of its own weight, and the radial connecting rod approaches the ash receiving plate.

[0040] When the ash connecting plate is against the ash connecting plate supporting member under the action of its own weight, the ash connecting plate is distributed horizontally.

[0041] During the operation of the circulating fluidized bed boiler, the ash at the bottom of the returner will fall into the vertical upper cylinder through the ash discharge port and the ash discharge pipe and gather above the upper piston (the upper end plate is pressed against the limit plate under the action of the return spring, and the upper piston is located in the vertical upper cylinder, closing the lower end of the vertical upper cylinder to ensure that the normal operation of the returner is not affected). When the ash in the vertical upper cylinder increases gradually, the gravity of the ash in the vertical upper cylinder acting on the upper piston overcomes the adsorption force of the magnet on the upper end plate and the supporting force of the return spring on the upper end plate (that is, the gravity of the ash in the vertical upper cylinder acting on the upper piston is greater than the sum of the adsorption force of the magnet on the upper end plate and the supporting force of the return spring on the upper end plate), the upper end plate, the upper piston, the lower piston, the vertical connecting rod and the push rod will move downward under the gravity of the ash in the vertical upper cylinder until the limit block abuts against the upper end of the vertical guide sleeve. At this time, the lower piston is located in the vertical lower cylinder, closing the upper end of the vertical lower cylinder to ensure that the normal operation of the return device is not affected; at the same time, the upper piston is located in the adapter cylinder and separated from the vertical upper cylinder, and the ash receiving plate abuts against the ash receiving plate support under the action of its own weight, so that the ash in the vertical upper cylinder falls downward into the adapter cylinder, and most of the ash falling into the adapter cylinder will fall on the ash receiving plate.

[0042] When the ash in the vertical upper cylinder falls downward into the adapter cylinder, most of the ash will fall on the ash receiving plate. Therefore, at this time, the upper end plate, the upper piston, the lower piston, the vertical connecting rod and the push rod will move upward under the action of the return spring until the upper end plate abuts against the limit plate; at this time, the upper piston is located in the vertical upper cylinder, closing the lower end of the vertical upper cylinder to ensure that the normal operation of the returner is not affected; at the same time, the lower piston is located in the adapter cylinder and separated from the vertical lower cylinder, the push rod abuts against the lower surface of the ash receiving plate and makes the ash receiving plate inclined, so that the ash on the ash receiving plate slides into the adapter cylinder and is output downward through the vertical lower cylinder, so as to achieve the timely discharge of the ash at the bottom of the returner without affecting the normal operation of the returner of the circulating fluidized bed boiler, effectively preventing the ash at the bottom of the returner from entering the combustion chamber for the second time, thereby reducing the fly ash yield. On the other hand, the intermittent ash unloading opening and closing device eliminates the electrical control and motor, which not only simplifies the structure, but also effectively solves the problem of electric valve failure caused by easy damage to the electronic components of the electric valve due to the high ambient temperature of the circulating fluidized bed boiler.

[0043] Specifically, Figure 1 , Figure 2As shown, the fly ash reduction treatment device for the circulating fluidized bed boiler also includes an ash discharge pipe 6, an ash conveying belt 7 and a screw conveyor 5. The screw conveyor includes a feed port and a discharge port. The vertical lower cylinder is connected to the feed port. The discharge port is located above the ash conveying belt. The upper end of the ash discharge pipe is connected to the discharge port, and the lower end of the ash discharge pipe is located above the ash conveying belt. In this way, the ash in the vertical lower cylinder can pass through the screw conveyor, and then be transported to the ash conveying belt through the ash discharge pipe, and then transported away by the ash conveying belt.

[0044] Furthermore, the screw conveyor is a water-cooled screw conveyor. In this way, the ash can be cooled during the conveying process in the screw conveyor, so as to avoid the ash delivered to the ash conveying belt being too hot and causing safety hazards.

[0045] Further, such as Figure 3 As shown, the upper end surface of the upper piston is provided with a conical protrusion. In this way, when the upper piston is located in the adapter tube and separated from the vertical upper cylinder tube, it is beneficial to make the ash above the upper piston fall down into the adapter tube to prevent the ash from gathering at the upper end of the upper piston.

[0046] Further, such as Figure 3 As shown, the upper end surface of the lower piston is also provided with a conical protrusion. In this way, when the lower piston is located in the adapter tube and separated from the vertical lower cylinder barrel, it is beneficial to make the ash residue above the lower piston fall down into the vertical lower cylinder barrel to avoid the ash residue from gathering at the upper end of the lower piston.

[0047] In this embodiment, the upper piston and the lower piston are both made of metal, such as stainless steel or aluminum alloy.

[0048] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent transformation made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A fly ash reduction treatment device for a circulating fluidized bed boiler, characterized in that: include: The ash discharge port is arranged at the bottom of the return feeder of the circulating fluidized bed boiler; Ash discharge pipe; The intermittent ash unloading opening and closing device comprises a reset spring, a transfer cylinder with closed upper and lower ends, a vertical upper cylinder arranged at the upper end of the transfer cylinder, an upper piston for cooperating with the vertical upper cylinder, a vertical lower cylinder arranged at the lower end of the transfer cylinder, a lower piston for cooperating with the vertical lower cylinder, a vertical connecting rod connecting the upper piston and the lower piston, an ash receiving plate arranged in the transfer cylinder through a horizontal rotating shaft, an ash receiving plate support arranged on the inner wall of the transfer cylinder, a push rod connected to the vertical connecting rod, and a vertical lower cylinder arranged at the lower end of the transfer cylinder. A limit plate on the outer wall of the cylinder, a vertical guide sleeve arranged at the upper end of the adapter cylinder, a vertical guide rod sliding along the vertical guide sleeve, an upper end plate arranged at the upper end of the vertical guide rod, and a limit block arranged on the vertical guide rod and located above the vertical guide sleeve, the upper end of the ash discharge pipe is connected to the ash discharge port, the lower end of the ash discharge pipe is connected to the upper end of the vertical upper cylinder, a connecting rod opening is provided on the ash receiving plate, the vertical connecting rod passes through the connecting rod opening, the push rod is located below the ash receiving plate, and the reset spring is used to provide elastic force to move the upper piston and the lower piston upward; The limit plate is located above the upper end plate, the lower end of the vertical guide rod is connected to the vertical connecting rod through a radial connecting rod, the lower end of the return spring abuts against the upper end of the adapter tube, the upper end of the return spring abuts against the upper end plate, and the upper end plate abuts against the limit plate under the action of the return spring.

2. The fly ash reduction treatment device for a circulating fluidized bed boiler according to claim 1 is characterized in that: When the upper end plate abuts against the limit plate, the lower piston is located in the adapter cylinder and separated from the vertical lower cylinder, the upper piston is located in the vertical upper cylinder, and the push rod abuts against the lower surface of the ash receiving plate and makes the ash receiving plate inclined; When the limit block abuts against the upper end of the vertical guide sleeve, the upper piston is located in the adapter tube and separated from the vertical upper cylinder, the lower piston is located in the vertical lower cylinder, and the ash receiving plate abuts against the ash receiving plate support under the action of its own weight.

3. The fly ash reduction treatment device for a circulating fluidized bed boiler according to claim 2 is characterized in that: The upper end plate is an iron plate, and the limiting plate is provided with a magnet for adsorbing the upper end plate.

4. The fly ash reduction treatment device for a circulating fluidized bed boiler according to claim 2 or 3, characterized in that: The center of gravity of the ash receiving plate, the vertical connecting rod, the top rod and the ash receiving plate supporting member are located on the same side of the horizontal rotating shaft.

5. The fly ash reduction treatment device for a circulating fluidized bed boiler according to claim 1, 2 or 3, characterized in that: The upper end surface of the upper piston is provided with a conical protrusion.

6. The fly ash reduction treatment device for a circulating fluidized bed boiler according to claim 1, 2 or 3, characterized in that: The upper end surface of the lower piston is also provided with a conical protrusion.

7. The fly ash reduction treatment device for a circulating fluidized bed boiler according to claim 1, 2 or 3, characterized in that: The lower end of the adapter tube is provided with a tapered connecting tube whose inner diameter gradually decreases from top to bottom, and the upper end of the vertical lower cylinder tube is connected to the tapered connecting tube.

8. The fly ash reduction treatment device for a circulating fluidized bed boiler according to claim 1, 2 or 3, characterized in that: It also includes an ash conveying belt and a screw conveyor. The screw conveyor includes a feed port and a discharge port. The vertical lower cylinder is connected to the feed port, and the discharge port is located above the ash conveying belt.

9. The fly ash reduction treatment device for a circulating fluidized bed boiler according to claim 8, characterized in that: The screw conveyor is a water-cooled screw conveyor.

10. The fly ash reduction treatment device for a circulating fluidized bed boiler according to claim 8, characterized in that: It also includes an ash discharge pipe, the upper end of which is connected to the discharge port, and the lower end of which is located above the ash conveying belt.

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