Online dredging device for powder return pipe of dynamic pulverized coal separator

Abstract

The utility model belongs to the technical field of pulverized coal separators, and particularly relates to an online dredging device for a powder return pipe of a dynamic pulverized coal separator. Comprising a support welded to the side face of a mill outlet center cylinder, a pipeline communicated with a powder return pipe is arranged in the support, a hydraulic cylinder installed on the support is arranged in the pipeline, the hydraulic cylinder is in transmission connection with a piston rod capable of stretching out and drawing back in the vertical direction, and the piston rod is located under the blocked position of the powder return pipe. According to the scheme, the powder return pipe dredging device is specially aimed at the site condition of equipment working, the frequently-blocked part in the powder return pipe can be safely and effectively dredged in the running state, the problem that a mill stops running due to blockage is solved, the economical efficiency and safety of unit running are improved, and the service life of the mill is prolonged. The maintenance cost and the labor cost of the equipment are reduced on the whole, and the continuous stability of the production of the pulverizing system is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal powder separators, and in particular relates to an online dredging device for a powder return pipe of a dynamic coal powder separator. Background Art

[0002] The coal powder separator of the pulverizer was originally designed as a radial static separator. In recent years, under the actual conditions of constantly changing coal types, the coal powder fineness of the static separator is difficult to adjust and the uniformity is poor, making it difficult to ensure the height of the boiler combustion layer and the stability of the flame, which has caused great obstacles to the safety and economic stability of the power plant.

[0003] We then improved the pulverizing system and adopted a dynamic separator to achieve dynamic adjustment of coal powder fineness within a certain range, which basically met the power plant's demand for coal powder fineness adjustment. However, the problem of easy clogging of the powder return pipe still exists in the modified dynamic separator. Figure 1 As shown. In operation, it must be cleaned at least once a week, so the mill must be shut down, especially when the lower pulverizing system is shut down, which will cause serious disturbance and impact on the combustion system. If necessary, oil must be added to assist combustion, which greatly affects the continuous and stable operation of the unit. In addition, to deal with the blockage of the separator return powder pipe, it is necessary to open the lower dredging hole of the operating layer. Due to the narrow and cramped location of the return powder pipe dredging hole, it is very inconvenient for operators to clean it. In addition, during the operation, they will inevitably come into contact with high-temperature coal powder, which poses a serious safety hazard to the staff. Utility Model Content

[0004] In view of the above-mentioned problems existing in the prior art, the purpose of the utility model is to provide a dynamic coal powder separator return pipe online clearing device which can automatically and conveniently clear the easily blocked positions in the coal powder separator return pipe. The clearing work can be completed when the separator is in operation, thereby improving the economy and safety of the unit operation.

[0005] In order to solve the above problems, the technical solution adopted by the utility model is as follows:

[0006] An online dredging device for a return powder pipe of a dynamic coal powder separator comprises a bracket welded to the side of a central cylinder at a mill outlet, a pipeline connected to the return powder pipe is arranged in the bracket, a hydraulic cylinder installed on the bracket is arranged in the pipeline, a piston rod which can be extended and retracted in a vertical direction is transmission-connected to the hydraulic cylinder, and the piston rod is located directly below the blocked part of the return powder pipe;

[0007] The pipeline is also provided with a plurality of jet holes which are also mounted on the bracket, the jet holes are connected to control valves, and the jet holes face upwards;

[0008] A valve capable of controlling the communication between the pipeline and the powder return pipe is arranged on the top of the pipeline.

[0009] Furthermore, the top end of the piston rod is connected to an umbrella-shaped dredging head through a vertical rod, and the dredging head is provided with an umbrella-shaped cross blade.

[0010] Furthermore, the control valve is a minimum pressure maintaining valve and is connected to a pressure gauge.

[0011] Furthermore, a plurality of the air injection holes are arranged in a circular array with the piston rod as the center.

[0012] Furthermore, a plurality of the air injection holes are distributed in a spiral trajectory with the piston rod as the center.

[0013] Furthermore, the plurality of the jet holes can rotate together in a horizontal plane with the piston rod as the axis.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] This solution is specifically designed for the on-site conditions of equipment operation. It can safely and effectively clear the parts of the powder return pipe that are frequently blocked during operation, eliminate the problem of mill shutdown caused by blockage, improve the economy and safety of unit operation, reduce the equipment maintenance cost and labor cost as a whole, and ensure the continuous stability of the powder making system production. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the local structure of a dynamic separator in the prior art;

[0017] Figure 2 It is the overall structural diagram of the device;

[0018] Figure 3 It is a schematic diagram of the structure of the piston rod, the dredging head and the cross blade in the device;

[0019] In the figure: 1- bracket; 2- pipeline; 3- hydraulic cylinder; 4- piston rod; 5- vertical rod; 6- dredging head; 7- cross blade; 8- valve; 9- jet hole; 10- control valve. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with specific embodiments.

[0021] like Figure 2As shown, the online dredging device for the return powder pipe of the dynamic coal powder separator described in the utility model comprises a bracket 1 welded on the side of the central tube of the mill outlet, a pipeline 2 connected to the return powder pipe is arranged in the bracket 1, a hydraulic cylinder 3 installed on the bracket 1 is arranged in the pipeline 2, and a piston rod 4 that can be extended in the vertical direction is connected to the hydraulic cylinder 3, and the piston rod 4 is located directly below the blocked part of the return powder pipe. Among them, A in the figure is the frequent blocked part of the return powder pipe, B is the inspection hole, and C is the central tube of the mill outlet.

[0022] like Figure 3 As shown, an umbrella-shaped dredging head 6 is connected to the top of the piston rod 4 through a vertical rod 5, and a cross blade 7 which is also umbrella-shaped is also provided on the dredging head 6. Among them, D is a hexagonal anti-skid fastening screw.

[0023] A valve 8 is provided at the top of the pipeline 2 for controlling the connection between the pipeline 2 and the powder return pipe. Therefore, when blockage occurs in the powder return pipe, the valve 8 can be opened, and the lifting and lowering of the piston rod 4 drives the dredging head 6 and the cross blade 7 to lift and lower, and perform up and down reciprocating motion, thereby achieving dredging of the blocked part in the powder return pipe.

[0024] A plurality of jet holes 9 also mounted on the bracket 1 are provided in the pipeline 2. These jet holes 9 are connected to a control valve 10, which is a minimum pressure maintaining valve and is connected to a pressure gauge. All the jet holes 9 face upward, and in the present embodiment, these jet holes 9 are distributed in a spiral trajectory with the piston rod 4 as the center, and can rotate in a horizontal plane with the piston rod 4 as the axis, so that these jet holes 9 can form a spiral jet route close to the pipeline 2 while rotating, and the ejected air flow can pass through the gap between the debris and the tube wall of the powder return pipe to form a cyclone attached to the wall. The cyclone generates an upward component force during the rotation process, which separates the debris in the powder return pipe from the tube wall. Combined with the reciprocating motion of the dredging head 6, the debris in the powder return pipe can be completely dredged.

[0025] In other embodiments, the air injection holes 9 may also be arranged in a circular array with the piston rod 4 as the center.

Claims

1. An online dredging device for a dynamic coal powder separator return pipe, characterized in that: It comprises a bracket welded on the side of the central cylinder at the mill outlet, wherein a pipeline connected to the powder return pipe is arranged in the bracket, wherein a hydraulic cylinder installed on the bracket is arranged in the pipeline, wherein a piston rod which can be extended and retracted in the vertical direction is transmission-connected to the hydraulic cylinder, and wherein the piston rod is located directly below the blocked part of the powder return pipe; The pipeline is also provided with a plurality of jet holes which are also mounted on the bracket, the jet holes are connected to control valves, and the jet holes face upwards; A valve capable of controlling the communication between the pipeline and the powder return pipe is arranged on the top of the pipeline.

2. The online dredging device for the return pulverized coal pipe of a dynamic pulverized coal separator according to claim 1 is characterized in that: The top end of the piston rod is connected to an umbrella-shaped dredging head through a vertical rod, and the dredging head is provided with an umbrella-shaped cross blade.

3. The online dredging device for the return pipe of a dynamic coal powder separator according to claim 1 is characterized in that: The control valve is a minimum pressure maintaining valve and is connected with a pressure gauge.

4. The online dredging device for the return pipe of a dynamic coal powder separator according to claim 1 is characterized in that: A plurality of the air injection holes are arranged in a circular array with the piston rod as the center.

5. The on-line dredging device for the return pulverized coal pipe of a dynamic pulverized coal separator according to claim 1, characterized in that: A plurality of the air injection holes are distributed in a spiral trajectory with the piston rod as the center.

6. The on-line dredging device for the return pulverized coal pipe of a dynamic pulverized coal separator according to any one of claims 4 or 5, characterized in that: The plurality of air injection holes can rotate together in a horizontal plane with the piston rod as the axis.

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