A coal powder online sampling device

Abstract

The utility model discloses an online sampling device for coal powder, which is used for online sampling of coal powder on a negative pressure pipeline, and is characterized in that it includes a discharger for separating materials and gases, the discharger has a feed port and two discharge ports, the feed port is connected to the negative pressure pipeline through a feed pipeline, one of the discharge ports is connected to the negative pressure pipeline through an air outlet pipeline, the other discharge port of the discharger is connected to a sampling pipeline, the feed pipeline, the air outlet pipeline and the sampling pipeline are all provided with a control valve for controlling the opening or closing of the pipeline, wherein the inlet end of the feed pipeline is provided with a blocking mechanism for guiding the material to enter the feed pipeline. The utility model can realize online sampling of coal powder, the sampling is accurate, the samples are more representative, and it is safe and efficient, and will not affect the transportation of materials.

Description

Technical Field

[0001] The utility model relates to the technical field of spraying pots, in particular to an online sampling device for coal powder. Background Art

[0002] Coal powder fineness is an important parameter for boiler combustion adjustment, which directly affects the safe and economic operation of the boiler. Therefore, it is necessary to measure the coal powder fineness in a timely and accurate manner according to the changes in the coal quality of the boiler combustion, so as to be able to control and adjust the boiler combustion in a targeted and planned manner. To achieve the best operation mode of the boiler. The intermediate storage type pulverizing system has a coal powder warehouse to store coal powder, so it is easy to take out the coal powder at the lower powder pipe.

[0003] However, since the coal powder stored in the coal powder bin will inevitably become damp after a long time, the coal powder sampled from the coal powder bin is not representative. It is best to take samples during the pipeline transportation of the coal powder. During the pipeline transportation of the coal powder, the coal powder will be fully and evenly mixed with the dry gas in the negative pressure pipeline, and the dry gas will dry the coal powder. At this time, sampling the coal powder is the most representative. However, considering the difficulty and safety of online sampling of coal powder, there is currently no mature online sampling device on the market. Most of the sampling is offline, that is, sampling is carried out during the storage of coal powder. The results measured by sampling in this link are not accurate enough and are not representative. Utility Model Content

[0004] The utility model aims to solve the above problems and designs a coal powder online sampling device to solve the problem of difficulty in coal powder online sampling.

[0005] To achieve the above-mentioned purpose, the technical solution of the utility model is a kind of online coal powder sampling device, which is used for online sampling of coal powder on a negative pressure pipeline, and is characterized in that it includes a discharger for separating material and gas, the discharger having a feed port and two discharge ports, the feed port is connected with the negative pressure pipeline through a feed pipeline, one of the discharge ports is connected with the negative pressure pipeline through an air outlet pipeline, and the other discharge port of the discharger is connected with a sampling pipeline, and the feed pipeline, the air outlet pipeline and the sampling pipeline are all provided with control valves for controlling the opening or closing of the pipelines, wherein the inlet end of the feed pipeline is provided with a blocking mechanism for guiding the material into the feed pipeline.

[0006] Preferably, the control valves on the feed pipe and the gas outlet pipe are one-way valves, and the control valve on the sampling pipe is a ball valve.

[0007] Preferably, a negative pressure gauge is provided on the sampling pipeline, and the negative pressure gauge is located between the discharger and the ball valve.

[0008] Preferably, the discharger comprises an outer shell and fan blades located inside the outer shell, and a gap is left between the fan blades and the outer shell.

[0009] Preferably, the inner diameter of the outlet of the air outlet pipe gradually increases.

[0010] Preferably, the inlet end of the feed pipe extends into the negative pressure pipe and is bent to form the blocking mechanism, and the inlet of the feed pipe faces the conveying direction of the negative pressure pipe.

[0011] Preferably, the feed pipe extends to the inner side of the negative pressure pipe and a notch is provided on the side facing the conveying direction of the negative pressure pipe, thereby forming the blocking mechanism.

[0012] Preferably, the blocking mechanism is a blocking plate, and the blocking plate is arranged at the inlet of the feed pipe.

[0013] Compared with the prior art, the beneficial effects are:

[0014] In the utility model, the negative pressure pipeline contains a solid-gas two-phase fluid, namely, a coal gas mixture. The coal gas mixture enters the feed pipeline after being guided by a blocking mechanism, and then enters the discharger from the feed pipeline to separate the coal gas. The dry gas will flow back into the negative pressure pipeline through the outlet pipeline. When sampling, the control valves on the feed pipeline and the outlet pipeline are closed, and the control valve on the sampling pipeline is opened, so that the coal powder can be sampled through the sampling pipeline. The sampling is accurate, the sample is more representative, and it is safe and efficient, and will not affect the transportation of materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the coal powder online sampling device in Example 1 of the utility model;

[0016] Figure 2 It is a cross-sectional structural schematic diagram of the coal powder online sampling device in Example 1 of the utility model;

[0017] Figure 3 It is a cross-sectional structural schematic diagram of the coal powder online sampling device in Example 2 of the utility model;

[0018] Figure 4 It is a schematic cross-sectional structure diagram of the coal powder online sampling device in Example 2 of the utility model.

[0019] In the figure, 1. negative pressure pipe; 2. discharger; 21. shell; 22. fan blade; 3. feed pipe; 31. blocking mechanism; 4. air outlet pipe; 5. sampling pipe; 6. handle; 7. one-way valve; 8. ball valve; 9. negative pressure gauge. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] like Figure 1 and Figure 2 As shown, a preferred embodiment of the utility model proposes an online coal powder sampling device, which is used for sampling coal powder during the transportation process. The coal powder and dry gas will be fully mixed in the negative pressure pipeline 1, and then the coal powder will be transported to the designated process by the pipeline, and the coal powder online sampling device is installed on the negative pressure pipeline 1.

[0022] like Figure 2 As shown, the pulverized coal online sampling device is mainly composed of a feed pipe 3, an outlet pipe 4, a sampling pipe 5 and a discharger 2, wherein the discharger 2 adopts a star-shaped discharger 2, and the star-shaped discharger 2 has a feed port and two outlet ports. The feed port is connected to the negative pressure pipe 1 through the feed pipe 3, one of the outlet ports is connected to the negative pressure pipe 1 through the outlet pipe 4, and the other outlet port is connected to the sampling pipe 5. The feed pipe 3 and the outlet pipe 4 are arranged in sequence along the conveying direction of the negative pressure pipe 1.

[0023] Both the feed pipe 3 and the gas outlet pipe 4 are provided with a one-way valve 7 for controlling the opening and closing of the pipes. The sampling pipe 5 is provided with a ball valve 8 for controlling the opening and closing of the sampling pipe 5 .

[0024] Before sampling, the ball valve 8 will be closed, the two one-way valves 7 will be opened, and the mixture of coal powder and dry gas in the negative pressure pipeline 1 will enter the star-shaped discharger 2 through the feed pipeline 3. The star-shaped discharger 2 will separate the coal powder and the dry gas. Most of the coal powder will remain in the discharger 2, and the dry gas will flow back into the negative pressure pipeline 1 through the outlet pipeline 4. Then all the one-way valves 7 will be closed, the ball valve 8 will be opened, and sampling will begin.

[0025] Since the inlet of the feed pipe 3 is inconsistent with the conveying direction of the negative pressure pipe 1, the material cannot enter the feed pipe 3 smoothly. Therefore, in this embodiment, a blocking mechanism 31 is provided at the inlet of the feed pipe 3. The blocking mechanism 31 is a blocking plate, and the blocking plate is provided on the right side of the inlet of the feed pipe 3. When the material hits the blocking plate, it will enter the feed pipe 3 along the blocking plate, and then enter the discharger 2.

[0026] refer to Figure 2The discharger 2 is composed of a shell 21 and a plurality of blades 22, wherein the plurality of blades 22 are fixed on a rotating shaft to form a structure similar to a fan, wherein the blades 22 are located inside the shell 21, and the rotating shaft is rotatably connected to the shell 21. A handle 6 is provided on the outside of the shell 21, and the handle 6 is fixedly connected to the rotating shaft. A very small gap is left between the blades 22 and the inner wall of the shell 21 for the passage of dry gas. After the mixture of coal powder and dry gas enters the discharger, most of the coal powder will be blocked and retained in the discharger 2, and the dry gas will flow into the air outlet pipe 4 through the gap. The blades 22 are manually rotated through the handle 6 to drive the coal powder into the sampling pipe 5.

[0027] The inner diameter of the air outlet of the air outlet pipe 4 will gradually increase, so that the gas pressure in the air outlet pipe 4 will be greater, and the pressure at the air outlet will be smaller, which is conducive to the dry gas to quickly enter the negative pressure pipe 1.

[0028] A negative pressure gauge 9 is also provided on the sampling pipeline 5 . The negative pressure gauge 9 is located between the discharger 2 and the ball valve 8 and is used to detect the pressure in the sampling pipeline 5 .

[0029] When sampling is completed, the pressure in the sampling pipe 5 can be detected by the negative pressure gauge 9 when sampling next time. If the pressure in the sampling pipe 5 is also negative, it can be determined that there is no coal powder remaining in the sampling pipe 5 from the last sampling. Otherwise, the coal powder in the sampling pipe 5 needs to be cleared and re-sampled. The sample taken in this way is more representative.

[0030] Example 2

[0031] like Figure 3 As shown, in this embodiment, the blocking mechanism 31 is formed by the inlet of the feed pipe 3 extending into the negative pressure pipe 1 and bending. After the feed pipe 3 extends into the negative pressure pipe 1, it bends 90 degrees, and the inlet faces the conveying direction of the negative pressure pipe 1. In this way, the mixture of coal powder and dry gas can smoothly enter the feed pipe 3 from the inlet.

[0032] Example 3

[0033] like Figure 4 As shown, in this embodiment, the inlet end of the feed pipe 3 extends into the negative pressure pipe 1 for a certain length, and a notch is provided on the side of the inlet end facing the conveying direction of the negative pressure pipe 1, thereby forming the above-mentioned blocking mechanism 31, which has the same function, blocking part of the coal powder from continuing to be conveyed backward along the negative pressure pipe 1, and the mixture of coal powder and dry gas will enter the feed pipe 3 along the notch.

[0034] The above technical solutions only reflect the preferred technical solutions of the technical solutions of the utility model. Some changes that may be made to certain parts thereof by technicians in this technical field all reflect the principles of the utility model and fall within the protection scope of the utility model.

Claims

1. A coal powder online sampling device, which is used for online sampling of coal powder on a negative pressure pipeline (1), characterized in that: The invention comprises a discharger (2) for separating materials and gases, wherein the discharger (2) has a feed port and two discharge ports, wherein the feed port is connected to the negative pressure pipe (1) via a feed pipe (3), wherein one of the discharge ports is connected to the negative pressure pipe (1) via an air outlet pipe (4), wherein the other discharge port of the discharger (2) is connected to a sampling pipe (5), wherein the feed pipe (3), the air outlet pipe (4) and the sampling pipe (5) are all provided with control valves for controlling the opening or closing of the pipes, wherein the inlet end of the feed pipe (3) is provided with a blocking mechanism (31) for guiding the material to enter the feed pipe (3).

2. The coal powder online sampling device according to claim 1, characterized in that: The control valves on the feed pipeline (3) and the gas outlet pipeline (4) are one-way valves (7), and the control valve on the sampling pipeline (5) is a ball valve (8).

3. The on-line coal powder sampling device according to claim 2, characterized in that: A negative pressure gauge (9) is provided on the sampling pipeline (5), and the negative pressure gauge (9) is located between the discharger (2) and the ball valve (8).

4. The on-line coal powder sampling device according to claim 1, characterized in that: The discharger (2) comprises an outer shell (21) and a fan blade (22) located inside the outer shell (21), and a gap is left between the fan blade (22) and the outer shell (21).

5. The on-line coal powder sampling device according to claim 1, characterized in that: The inner diameter of the outlet of the air outlet pipe (4) gradually increases.

6. The coal powder online sampling device according to any one of claims 1 to 5, characterized in that: The inlet end of the feed pipe (3) extends into the negative pressure pipe (1) and is bent to form the blocking mechanism (31), and the inlet of the feed pipe (3) faces the conveying direction of the negative pressure pipe (1).

7. The on-line coal powder sampling device according to any one of claims 1 to 5, characterized in that: The feed pipe (3) extends to the inner side of the negative pressure pipe (1) and is provided with a notch on the side facing the conveying direction of the negative pressure pipe (1), thereby forming the blocking mechanism (31).

8. The on-line coal powder sampling device according to any one of claims 1 to 5, characterized in that: The blocking mechanism (31) is a blocking plate, and the blocking plate is arranged at the inlet of the feed pipe (3).

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