Purging tool for sampling pipe of coal mill of coal-fired power generation unit

Abstract

The utility model discloses a coal-fired generating set coal mill sampling pipe purging tool which comprises a purging pipe, an air inlet valve, a pressure release valve and a pressure gauge, a quick coupling male head and a quick coupling female head are arranged at the two ends of the purging pipe respectively, and the air inlet valve and the pressure release valve are arranged on the purging pipe at intervals respectively. The air inlet valve is close to the quick connector male head, the pressure release valve is close to the quick connector female head, and the pressure gauge is arranged on the purging pipe through the first three-way connecting pipe and the right-angle bent pipe and located between the air inlet valve and the pressure release valve. The tool overcomes the defects of traditional sampling pipe purging operation, repeated purging is avoided, the purging operation efficiency is improved, potential safety hazards in the purging operation process are completely eradicated, and the personal safety of operators is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline dredging, in particular to a purging tool for a sampling pipe of a coal mill of a coal-fired power generation unit. Background Art

[0002] Usually, coal-fired generating units in power plants are equipped with coal mills, which are equipped with various thermal signals such as furnace differential pressure, grinding bowl differential pressure, lower wind pressure, and sealing wind and grinding bowl differential pressure, which are used to dynamically monitor the operation status of the coal mill. The furnace differential pressure signal is involved in the mill tripping. Since the sampling tube measurement points are often blocked due to poor coal quality during the operation of the coal mill, resulting in inaccurate signals and even interlocking mill tripping, operators need to purge the sampling tubes every month. During the purge operation, the sampling tubes are purged with the purge air in the instrument box. It is often found that the signal is still abnormal after the purge, and each purge is mostly completed based on experience.

[0003] For example, if the sound of the gas flow rate in the purge pipeline is used to judge, if there is a flow rate sound, it means that the sampling tube has been unblocked. However, when the coal mill is running, the on-site noise is relatively loud, and it is difficult to hear the flow rate sound, which leads to repeated purging and reduces the efficiency of the purging operation. In addition, after purging the sampling tube with the purge air in the instrument box, first close the purge valve that comes with the instrument box, and then quickly unplug the purge hose to determine whether there is return air in the sampling tube. If the return air is large, it indicates that the sampling tube is still blocked and needs to be purged or the sampling tube needs to be scorched. However, if the return air is large, the dust and particles in the sampling tube will be quickly brought out, which may accidentally injure the operator and pose a major safety hazard. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a purging tool for a sampling tube of a coal mill of a coal-fired power generation unit. The tool overcomes the defects of a traditional purging operation of a sampling tube, avoids repeated purging, improves the efficiency of the purging operation, eliminates the potential safety hazards during the purging operation, and ensures the personal safety of the operators.

[0005] In order to solve the above technical problems, the utility model discloses a coal-fired power generation unit coal mill sampling tube purging tooling, which includes a purging tube, an air intake valve, a pressure relief valve and a pressure gauge. A quick connector male head and a quick connector female head are respectively provided at both ends of the purging tube. The air intake valve and the pressure relief valve are respectively arranged at intervals on the purging tube, and the air intake valve is close to the quick connector male head, and the pressure relief valve is close to the quick connector female head. The pressure gauge is arranged on the purging tube through a first three-way pipe and a right-angle elbow and is located between the air intake valve and the pressure relief valve.

[0006] Furthermore, the input end of the pressure relief valve is connected to the purge pipe through a second three-way pipe, and the output end is connected to a downwardly bent copper pipe through a conversion joint.

[0007] Furthermore, the purge pipe is a 3-branch pipe, and the conversion joint is a 3-branch to 6mm pipe joint.

[0008] Furthermore, the pressure gauge has a range of 10 kg / cm2.

[0009] Furthermore, the female quick connector is a one-way quick pipe connector that limits the flow of gas into the purge pipe.

[0010] Since the utility model coal-fired power generation unit coal mill sampling tube purging tool adopts the above technical solution, that is, the tool includes a purging tube, an air intake valve, a pressure relief valve and a pressure gauge, and the two ends of the purging tube are respectively provided with a quick connector male head and a quick connector female head, the air intake valve and the pressure relief valve are respectively arranged at intervals on the purging tube, and the air intake valve is close to the quick connector male head, and the pressure relief valve is close to the quick connector female head, and the pressure gauge is arranged on the purging tube through the first three-way pipe and the right-angle elbow and is located between the air intake valve and the pressure relief valve. The tool overcomes the defects of the traditional sampling tube purging operation, avoids repeated purging, improves the efficiency of the purging operation, eliminates the safety hazards in the purging operation process, and ensures the personal safety of the operators. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present invention is further described in detail below in conjunction with the accompanying drawings and implementation examples:

[0012] Figure 1 The utility model is a schematic diagram of the structure of the sampling tube purge tooling of the coal mill of the coal-fired power generation unit. DETAILED DESCRIPTION

[0013] Implementation example Figure 1 As shown, the utility model of the purging tool for the sampling tube of the coal mill of the coal-fired power generation unit includes a purging tube 1, an air intake valve 2, a pressure relief valve 3 and a pressure gauge 4, wherein the two ends of the purging tube 1 are respectively provided with a quick connector male head 11 and a quick connector female head 12, the air intake valve 2 and the pressure relief valve 3 are respectively arranged at intervals on the purging tube 1, and the air intake valve 2 is close to the quick connector male head 11, and the pressure relief valve 3 is close to the quick connector female head 12, and the pressure gauge 4 is arranged on the purging tube 1 through a first three-way pipe 41 and a right-angle elbow 42 and is located between the air intake valve 2 and the pressure relief valve 3.

[0014] Preferably, the input end of the pressure relief valve 3 is connected to the purge pipe 1 through a second three-way pipe 31 , and the output end is connected to a downwardly bent copper pipe 33 through a conversion joint 32 .

[0015] Preferably, the purge pipe 1 is a 3-branch pipe, and the conversion joint 32 is a 3-branch to 6 mm pipe joint.

[0016] Preferably, the pressure gauge 4 has a measuring range of 10 kg / cm2, which is adapted to the gas pressure in the coal mill sampling tube and matches the pressure of the purge gas.

[0017] Preferably, the quick connector female end 12 is a one-way quick pipe connector that limits the gas from flowing into the purge pipe 1. The quick pipe connector prevents the gas in the coal mill sampling pipe from flowing back into the purge pipe, thereby ensuring the safety of the purge operation.

[0018] When purging the sampling tube of the coal mill, first connect the male quick connector of this tool to the purge gas output end in the instrument box, and connect the female quick connector to the sampling tube, and at the same time confirm that the air intake valve and the pressure relief valve are in the closed state. Then start the purging operation, first open the purge valve that comes with the instrument box, and then open the air intake valve. The purge gas will purge the sampling tube through the female quick connector, and observe the indication value of the pressure gauge pointer. At the beginning, the pointer pressure indication will be very large, even close to the purge intake pressure of 7kg / cm2. After about 1 minute, the pressure will gradually decrease, and then close the air intake valve. The pressure gauge pointer returns to zero, indicating that the sampling tube has been purged and the purging operation is completed.

[0019] If the pressure gauge pointer is always at the highest position during purging, and the pressure indication does not return to zero after closing the air inlet valve, it means that the sampling tube cannot be blown through. At this time, slowly open the pressure relief valve to eliminate the residual pressure. This can avoid the risk of injury from rapid leakage of residual pressure, and then carry out the pipeline coking operation. After the coking is completed, carry out the above-mentioned purging process again until the sampling tube is unblocked.

[0020] The tooling has a simple structure and is easy to use. The parts used are all standard parts, and materials are easy to obtain, so it can be easily assembled and has a low manufacturing cost. It can be used to dredge all types of sampling pipes, effectively improve work efficiency, avoid safety hazards during pressurized dredging operations, and ensure the safety of people and equipment.

Claims

1. A coal-fired power generation unit coal mill sampling tube purging tool, characterized by: The purging tool comprises a purging pipe, an air intake valve, a pressure relief valve and a pressure gauge. A male quick connector and a female quick connector are respectively provided at both ends of the purging pipe. The air intake valve and the pressure relief valve are respectively arranged at intervals on the purging pipe, and the air intake valve is close to the male quick connector, and the pressure relief valve is close to the female quick connector. The pressure gauge is arranged on the purging pipe through a first three-way pipe and a right-angle elbow and is located between the air intake valve and the pressure relief valve.

2. The coal-fired power generation unit coal mill sampling tube purging tool according to claim 1, characterized in that: The input end of the pressure relief valve is connected to the purge pipe through a second three-way pipe, and the output end is connected to a downwardly bent copper pipe through a conversion joint.

3. The coal-fired power generation unit coal mill sampling tube purging tool according to claim 2, characterized in that: The purge pipe is a 3-way pipe, and the conversion joint is a 3-way to 6mm pipe joint.

4. The coal-fired power generation unit coal mill sampling tube purging tool according to claim 1, characterized in that: The pressure gauge has a measuring range of 10 kg / cm2.

5. The coal-fired power generation unit coal mill sampling tube purging tool according to claim 1, characterized in that: The female quick connector is a one-way quick pipe connector that limits the flow of gas into the purge pipe.

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