Fly ash sampling device for boiler of thermal power plant

Abstract

The utility model discloses a boiler fly ash sampling device for a thermal power plant, and relates to the technical field of fly ash sampling. The device comprises a flue, a mounting hole is formed in one side of the flue, a sampling mechanism comprising a sampling pipe is mounted in the mounting hole, one end of the sampling pipe penetrates into the mounting hole and is fixed through a bolt, and the other end of the sampling pipe is fixedly connected with a hollow plate in an embedded manner; the rotating rod is arranged to drive the cleaning brush to clean the surface of the filter cloth in time, so that filter holes of the filter cloth can be prevented from being blocked by fly ash, the suction intensity of the adsorption force generated by the fan blades to the fly ash is ensured, and the fly ash collection efficiency is improved; in the process, the rotating rod is used for driving the pushing rod to drive the piston to move up and down to collect the fly ash, the collected fly ash can be prevented from being sprayed back into the flue, the sampling efficiency is improved, and in addition, the fly ash in the collecting barrel is prevented from leaking when the collecting barrel is replaced.

Description

Technical Field

[0001] The utility model relates to the technical field of fly ash sampling, in particular to a fly ash sampling device for a boiler in a thermal power plant. Background Technique

[0002] In a thermal power plant, coal is generally used as fuel for thermal power generation, and the boiler is the place where coal burns; during the boiler combustion process, the carbon content in the fly ash in the flue gas is one of the main indicators of the combustion efficiency of the coal-fired boiler in the power plant. The carbon content of the fly ash in the furnace is an important reference means and basis for the boiler combustion control efficiency. Controlling the carbon content of the fly ash is also an important means to improve the boiler efficiency.

[0003] In order to monitor the combustible content in the boiler fly ash, it is necessary to regularly sample and test the fly ash in the boiler. The existing ash sampling device usually installs a sampling cylinder outside the flue, and then guides the airflow to drive the fly ash into the inside of the sampling cylinder. After sampling, the sampling cylinder is separated from the flue to detect the fly ash. However, during the fly ash collection process, the fly ash is extremely easy to block the filter screen, affecting the airflow rate and intensity, thus reducing the fly ash collection efficiency;

[0004] In addition, the existing ash sampling device does not have the function of preventing fly ash from flowing back, resulting in the fly ash being sprayed back into the flue, reducing the fly ash collection rate, and it is also very easy to leak ash during the process of replacing the sampling bottle. Content of the Utility Model

[0005] The purpose of the utility model is to solve the problem that in the prior art, the fly ash is extremely easy to block the filter screen, affecting the airflow rate and intensity, thus reducing the fly ash collection efficiency, and to provide a fly ash sampling device for a boiler in a thermal power plant.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme: a fly ash sampling device for a boiler in a thermal power plant, including a flue, an installation hole is opened on one side of the flue, and a sampling mechanism including a sampling pipe is installed inside the installation hole. One end of the sampling pipe penetrates into the installation hole and is fixed by bolts, and the other end of the sampling pipe is fixedly connected with a hollowed-out plate in an embedded manner. Collection holes are opened on the outer surface of the lower end of the sampling pipe at a position inside the flue;

[0007] A motor is arranged on the outer surface of the hollowed-out plate near the middle. The output end of the motor penetrates into the sampling pipe and is fixedly connected with a fan blade, and the front of the fan blade faces the motor direction. An activity hole is opened on the outer surface of the lower end of the sampling pipe, and a collection mechanism for storing fly ash is arranged inside the activity hole.

[0008] Further, the sampling mechanism includes a filter plate, a filter cloth and a rotating rod; a filter plate is fixedly connected to the inside of the sampling pipe at a position between the movable hole and the fan blade, and a filter cloth is fixedly connected to the side of the filter plate away from the fan blade. The output end of the motor is fixedly connected to a rotating rod, and one end of the rotating rod penetrates through the filter plate and the filter cloth and is rotatably connected thereto. Two groups of connecting rods are fixedly connected to the outer surface of the rotating rod corresponding to the filter cloth, and cleaning brushes are fixedly connected to the outer surfaces of the connecting rods.

[0009] Further, the collection mechanism includes a collection cylinder, a connecting pipe and a piston; the upper outer surface of the collection cylinder is fixedly connected to a connecting pipe, and the inner diameter of the connecting pipe is smaller than the outer diameter of the collection cylinder. The connecting pipe is detachably connected to the mounting hole, and a piston is fixedly connected to the inside of the connecting pipe. The upper outer surface of the piston is convex in an arc shape.

[0010] Further, a connecting column is fixedly connected to the upper outer surface of the piston, and an arc-shaped plate is fixedly connected to the upper outer surface of the connecting column. Two groups of push rods are fixedly connected to the position of the rotating rod corresponding to the arc-shaped plate.

[0011] Further, a fixing strip is fixedly connected to the inside of the collection cylinder, and a limiting column is fixedly connected to the lower outer surface of the piston. One end of the limiting column penetrates through the fixing strip and is movably connected thereto. A spring is arranged on the outer surface of the limiting column between the piston and the fixing strip, and both ends of the spring are fixedly connected to the piston and the fixing strip respectively.

[0012] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present utility model are as follows:

[0013] In the present utility model, by arranging the rotating rod to drive the cleaning brush to clean the surface of the filter cloth in time, it can avoid the filter holes of the filter cloth being blocked by fly ash, thereby ensuring the adsorption force generated by the fan blade for attracting fly ash, improving the fly ash collection efficiency, and in this process, using the rotating rod to drive the push rod to drive the piston to move up and down to collect fly ash, it can avoid the collected fly ash from being backsprayed into the flue, improve the sampling efficiency, and in addition, avoid the leakage of fly ash inside when replacing the collection cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0015] Figure 2 is a combined view of the sampling mechanism and the collection mechanism of the present utility model;

[0016] Figure 3 is the Figure 2 enlarged view of area A of the present utility model;

[0017] Figure 4It is a schematic structural diagram of the collection mechanism of the present utility model;

[0018] Figure 5 It is a combined view of the arc-shaped plate and the push rod of the present utility model.

[0019] Reference numerals: 1, flue; 2, sampling pipe; 3, sampling mechanism; 301, filter plate; 302, filter cloth; 303, rotating rod; 304, connecting rod; 305, cleaning brush; 4, hollow plate; 5, collection hole; 6, collection mechanism; 601, collection cylinder; 602, connecting pipe; 603, piston; 604, connecting column; 605, arc-shaped plate; 606, push rod; 607, fixing strip; 608, limiting post; 609, spring; 7, motor; 8, fan blade. Specific implementation manners

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0021] Embodiment 1:

[0022] As Figures 1-3 shown, a fly ash sampling device for a boiler in a thermal power plant proposed by the present utility model includes a flue 1. An installation hole is opened on one side of the flue 1, and a sampling mechanism 3 including a sampling pipe 2 is installed inside the installation hole. One end of the sampling pipe 2 penetrates into the installation hole and is fixed by bolts. Before fly ash sampling, the sampling pipe 2 is inserted into the flue 1 through the installation hole and fixed. The other end of the sampling pipe 2 is fixedly connected with a hollow plate 4 in an embedded manner. Collection holes 5 are opened on the outer surface of the lower end of the sampling pipe 2 at a position inside the flue 1.

[0023] A motor 7 is arranged at a position close to the middle of the outer surface of the hollow plate 4. The output end of the motor 7 penetrates into the sampling pipe 2 and is fixedly connected with a fan blade 8. When sampling, the motor 7 is turned on. The output end of the motor 7 drives the fan blade 8 to operate. Since the front of the fan blade 8 faces the direction of the motor 7, an adsorption force is generated on the fly ash inside the flue 1 during the rotation of the fan blade 8. The sampling mechanism 3 includes a filter plate 301, a filter cloth 302, and a rotating rod 303. A filter plate 301 is fixedly connected at a position between the movable hole and the fan blade 8 inside the sampling pipe 2, and a filter cloth 302 is fixedly connected to the side of the outer surface of the filter plate 301 away from the fan blade 8. The fly ash inside the flue 1 enters the sampling pipe 2 through collection and floats towards the filter cloth 302.

[0024] The output end of the motor 7 is fixedly connected to a rotating rod 303. One end of the rotating rod 303 penetrates through the filter plate 301 and the filter cloth 302 and is rotatably connected thereto. Two groups of connecting rods 304 are fixedly connected to the position of the outer surface of the rotating rod 303 corresponding to the filter cloth 302. The outer surface of the connecting rod 304 is fixedly connected with a cleaning brush 305. During the rotation of the fan blade 8, the rotating rod 303 drives the connecting rod 304 to rotate therewith. Therefore, the cleaning brush 305 cleans the surface of the filter cloth 302 to prevent the filter cloth 302 from being blocked.

[0025] Embodiment 2:

[0026] As Figures 1-5 shown, the difference between this embodiment and Embodiment 1 is that an activity hole is provided on the outer surface of the lower end of the sampling tube 2, and a collection mechanism 6 for storing fly ash is arranged inside the activity hole. The collection mechanism 6 includes a collection cylinder 601, a connecting pipe 602 and a piston 603. The upper outer surface of the collection cylinder 601 is fixedly connected with a connecting pipe 602. The inner diameter of the connecting pipe 602 is smaller than the outer diameter of the collection cylinder 601. The connecting pipe 602 is detachably connected to the installation hole, and a piston 603 is fixedly connected inside the connecting pipe 602. The upper outer surface of the piston 603 is arc-shaped convex.

[0027] A connecting column 604 is fixedly connected to the upper outer surface of the piston 603, and an arc-shaped plate 605 is fixedly connected to the upper outer surface of the connecting column 604. Two groups of push rods 606 are fixedly connected to the position of the rotating rod 303 corresponding to the arc-shaped plate 605. During the rotation of the two groups of push rods 606 with the rotating rod 303, they contact the arc-shaped plate 605 alternately and push the arc-shaped plate 605 downward. The piston 603 enters the interior of the collection cylinder 601 under the push of the arc-shaped plate 605.

[0028] A fixing strip 607 is fixedly connected to the interior of the collection cylinder 601, and a limiting column 608 is fixedly connected to the lower outer surface of the piston 603. One end of the limiting column 608 penetrates through the fixing strip 607 and is movably connected thereto. A spring 609 is arranged at the position of the outer surface of the limiting column 608 between the piston 603 and the fixing strip 607. The two ends of the spring 609 are respectively fixedly connected to the piston 603 and the fixing strip 607. The fly ash cleaned by the cleaning brush 305 enters the interior of the collection cylinder 601 through the connecting pipe 602. When the push rod 606 is separated from the arc-shaped plate 605, the piston 603 returns to the interior of the connecting pipe 602 again under the action of the spring 609, so as to collect the fly ash repeatedly and prevent the fly ash inside from leaking when the collection cylinder 601 is replaced.

[0029] The working process and principle of the present utility model are as follows:

[0030] Step 1: Before fly ash sampling, insert the sampling pipe 2 into the inside of the flue 1 through the installation hole and fix it. When sampling, turn on the motor 7. The output end of the motor 7 drives the fan blade 8 to operate. During the rotation of the fan blade 8, an adsorption force is generated on the fly ash inside the flue 1.

[0031] Step 2: The fly ash inside the flue 1 enters the inside of the sampling pipe 2 through collection and floats towards the filter cloth 302. During the rotation of the fan blade 8, the rotating rod 303 drives the connecting rod 304 to rotate with it. Therefore, the cleaning brush 305 cleans the surface of the filter cloth 302.

[0032] Step 3: During the rotation of the two sets of push rods 606 along with the rotating rod 303, they contact the arc-shaped plate 605 in an alternating manner and push the arc-shaped plate 605 downward. The piston 603 enters the inside of the collection cylinder 601 under the push of the arc-shaped plate 605. The fly ash cleaned by the cleaning brush 305 enters the inside of the collection cylinder 601 through the connecting pipe 602. When the push rod 606 separates from the arc-shaped plate 605, the piston 603 returns to the inside of the connecting pipe 602 again under the action of the spring 609. In this way, the fly ash is collected repeatedly, which can not only prevent the fly ash from clogging the filter cloth 302 and the filter plate 301, but also use the piston 603 to block the connecting pipe 602 to prevent the collected fly ash from back-spraying into the inside of the flue 1, improving the sampling efficiency. In addition, it can prevent the fly ash inside from leaking when replacing the collection cylinder 601.

[0033] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A fly ash sampling device for a boiler in a thermal power plant, comprising a flue (1), characterized in that, One side of the flue (1) is provided with an installation hole, and a sampling mechanism (3) including a sampling pipe (2) is installed inside the installation hole. One end of the sampling pipe (2) penetrates into the installation hole and is fixed by bolts, and the other end of the sampling pipe (2) is fixedly connected with a hollowed-out plate (4) in an embedded manner. A collection hole (5) is provided on the outer surface of the lower end of the sampling pipe (2) at a position inside the flue (1). A motor (7) is arranged at a position near the middle of the outer surface of the hollowed-out plate (4). The output end of the motor (7) penetrates into the sampling pipe (2) and is fixedly connected with a fan blade (8), and the front surface of the fan blade (8) faces the direction of the motor (7). A movable hole is provided on the outer surface of the lower end of the sampling pipe (2), and a collection mechanism (6) for storing fly ash is arranged inside the movable hole.

2. The fly ash sampling device for a boiler in a thermal power plant according to claim 1, characterized in that, The sampling mechanism (3) includes a filter plate (301), a filter cloth (302) and a rotating rod (303). A filter plate (301) is fixedly connected inside the sampling pipe (2) at a position between the movable hole and the fan blade (8), and a filter cloth (302) is fixedly connected to one side of the outer surface of the filter plate (301) away from the fan blade (8). The output end of the motor (7) is fixedly connected with a rotating rod (303), and one end of the rotating rod (303) penetrates through the filter plate (301) and the filter cloth (302) and is rotatably connected thereto. Two groups of connecting rods (304) are fixedly connected to the outer surface of the rotating rod (303) at a position corresponding to the filter cloth (302), and a cleaning brush (305) is fixedly connected to the outer surface of the connecting rod (304).

3. The fly ash sampling device for a boiler in a thermal power plant according to claim 1, characterized in that, The collection mechanism (6) includes a collection cylinder (601), a connecting pipe (602) and a piston (603). A connecting pipe (602) is fixedly connected to the outer surface of the upper end of the collection cylinder (601), and the inner diameter of the connecting pipe (602) is smaller than the outer diameter of the collection cylinder (601). The connecting pipe (602) is detachably connected to the installation hole, and a piston (603) is fixedly connected inside the connecting pipe (602). The outer surface of the upper end of the piston (603) is convex in an arc shape.

4. The fly ash sampling device for a boiler in a thermal power plant according to claim 3, characterized in that, A connecting column (604) is fixedly connected to the outer surface of the upper end of the piston (603), and an arc-shaped plate (605) is fixedly connected to the outer surface of the upper end of the connecting column (604). Two groups of push rods (606) are fixedly connected to a position corresponding to the arc-shaped plate (605) at one end of the rotating rod (303).

5. The fly ash sampling device for a boiler in a thermal power plant according to claim 4, characterized in that, A fixing strip (607) is fixedly connected inside the collection cylinder (601), and a limiting column (608) is fixedly connected to the outer surface of the lower end of the piston (603). One end of the limiting column (608) penetrates through the fixing strip (607) and is movably connected thereto. A spring (609) is arranged on the outer surface of the limiting column (608) at a position between the piston (603) and the fixing strip (607), and both ends of the spring (609) are fixedly connected to the piston (603) and the fixing strip (607) respectively.

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