Full-automatic pulverized coal sampling device

Abstract

The utility model discloses a full-automatic pulverized coal sampling device. A sampling motor controls a sampling probe to do telescopic motion along a sampling tube and controls the sampling probe to be positioned at any one of an original point position, a blowback position and a sampling depth position; one end of the sampling pipe is connected into the pulverized coal pipeline through the first mounting seat, the other end of the sampling pipe is connected to the cyclone separator, the bottom end of the cyclone separator is connected with the sampling pipe, and the vibrator is mounted on the outer wall of the cyclone separator; compressed air is conveyed to the jet flow air extractor through the pressure transmitting pipeline, the jet flow air extractor is connected with one end of the air injection pipe, the other end of the air injection pipe is connected into the pulverized coal pipeline through the second installation base, and a negative pressure adjusting assembly is arranged on the pressure transmitting pipeline and connected with the pressure and flow speed measuring assembly. According to the utility model, the sampling uniformity and efficiency are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal powder sampling, and specifically to a fully automatic coal powder sampling device. Background Art

[0002] The fineness of pulverized coal is an important parameter for boiler combustion adjustment and has an important impact on boiler combustion. The finer the pulverized coal, the more complete the combustion, the smaller the heat loss of unburned carbon, and the higher the boiler efficiency. However, the power consumption of pulverizing (power consumption of primary fan, coal mill and coal feeder) and metal consumption will increase. In addition, the pulverized coal will ignite earlier, the center of the furnace flame will be lowered, and the burner nozzle will be easily burned. Therefore, for certain types of coal and boiler equipment, the fineness of the coal entering the furnace is controlled within a suitable range, which can not only ensure the complete combustion of the pulverized coal, but also reduce the power consumption of the pulverizing system and equipment wear. Only by accurately measuring the fineness of pulverized coal can we adjust the boiler combustion in a planned manner and achieve the best operation mode of the boiler, thereby achieving the purpose of energy saving.

[0003] Since the direct-blowing pulverizing system has no coal powder bin, it needs to take samples from the primary air powder pipe for measurement. Therefore, how to obtain representative coal powder samples from the primary air duct will become the key. The traditional coal mill coal powder sampling process is to extract coal powder samples from one diameter direction or two mutually perpendicular diameter directions of the coal powder pipe. Due to the centrifugal force and gravity, the coal powder airflow will be separated and a high concentration area will be formed on the pipe wall, making it difficult to collect a truly representative sample.

[0004] Therefore, it is necessary to accurately measure the fineness of coal powder so that the combustion can be controlled and adjusted in a targeted and planned manner to achieve the best operation mode of the boiler. At present, the sampling of coal powder in the coal mining industry includes traditional manual sampling and coal powder sampling devices.

[0005] The traditional manual coal powder sampling process is to extract coal powder samples from one diameter direction or two mutually perpendicular diameter directions of the coal powder pipeline. Due to the effects of centrifugal force and gravity, the coal powder airflow will separate and form a high-concentration area on the pipe wall. Therefore, it is difficult to collect truly representative samples. The test data obtained conceals many equipment problems and causes staff to make misjudgments.

[0006] Most traditional coal powder sampling devices are push-in type. However, this sampling device also requires manual adjustment of the sampling tube each time it is used, which is very cumbersome. Some people also use fixed coal powder sampling devices, which do not require adjustment of the sampling tube and can directly sample coal powder. For example, the Chinese utility model patent with announcement number CN216847048U specifically discloses a fixed fully automatic coal powder sampling device.

[0007] However, during actual use of the above-mentioned coal powder sampling device, people will find that the push-in type coal powder sampling device cannot achieve fully automatic sampling, and manual adjustment will greatly increase the workload of workers. When a fixed type coal powder sampling device is used to sample coal powder at specific sampling points, the environment in the coal channel is different. Since coal powder sampling cannot be performed at different sampling points, incomplete sampling is likely to occur. Summary of the invention

[0008] Purpose of the invention: The purpose of the utility model is to provide a fully automatic coal powder sampling device to address the deficiencies of the prior art and to achieve automatic and efficient sampling of coal powder.

[0009] Technical solution: The fully automatic coal powder sampling device of the utility model comprises a sampling box, in which a sampling unit, a speed measuring unit and a control unit are arranged; the sampling unit comprises a telescopic sampler, a cyclone separator and a vibrator, and the speed measuring unit comprises a jet vacuum pump, a negative pressure regulating component, a pressure and flow rate measuring component and a pressure transmission pipeline;

[0010] The telescopic sampler comprises a sampling tube, a sampling probe and a sampling motor, wherein the sampling motor controls the sampling probe to telescopically move along the sampling tube and controls the sampling probe to be positioned at any one of an origin position, a backflush position and a sampling depth position, and the sampling depth position>backflush position>origin position;

[0011] One end of the sampling tube is connected to the coal powder pipeline through a first mounting seat, and the other end of the sampling tube is connected to the cyclone separator. The bottom end of the cyclone separator is connected to the sampling tube, and the rapper is installed on the outer wall of the cyclone separator.

[0012] The compressed air is sent to the jet vacuum pump through the pressure transmitting pipeline. The jet vacuum pump is connected to one end of the jet pipe. The other end of the jet pipe is connected to the pulverized coal pipeline through a second mounting seat. A negative pressure regulating component is provided on the pressure transmitting pipeline. The negative pressure regulating component is connected to the pressure and flow rate measuring component.

[0013] During sampling, the sampling motor is started by the control unit to drive the sampling probe to move toward the coal powder pipeline. The sampling probe faces the coal powder flow in the coal powder pipeline. When the compressed air enters the jet aspirator through the negative pressure regulating component, the jet action of the jet aspirator prompts the gas-powder mixture in the coal powder pipeline to enter the cyclone separator along the sampling tube. The gas-powder mixture is separated into solid and gas in the cyclone separator. The separated coal powder falls into the sampling bottle below the cyclone separator, and the gas is sent back into the coal powder pipeline.

[0014] To further improve the above technical solution, the sampling depth position is limited to be smaller than the current coal powder pipeline diameter.

[0015] Furthermore, the pressure and flow rate measurement component includes a wind speed sensor and a differential pressure sensor; the wind speed sensor is installed in the primary air powder tube to measure the flow rate value of the primary air powder tube; the differential pressure sensor is installed at the outlet of the sampling probe of the telescopic sampler to collect the sampling differential pressure value.

[0016] Furthermore, the negative pressure regulating component includes a distributor, a negative pressure generator, a regulating valve, a valve plate seat, a purge valve, and a sampling valve. The compressed air enters the distributor through an air connecting pipe. The negative pressure generator is connected to the distributor through a regulating valve. The output end of the distributor is connected to the valve plate seat. The valve plate seat is provided with solenoid valve 1, solenoid valve 2, solenoid valve 3, and solenoid valve 4. The solenoid valve 1 and solenoid valve 2 are connected to the rapper, the solenoid valve 3 is connected to the sampling valve, and the solenoid valve 4 is connected to the back-blowing valve.

[0017] Furthermore, the sampling box is installed to the outside of the coal powder pipeline through an inclined support, a human-machine interface is provided on the outside of the sampling box, the human-machine interface is connected to the control unit, and the inside of the sampling box is connected to the coal powder pipeline through the first mounting seat and the second mounting seat.

[0018] Beneficial effect: Compared with the prior art, the utility model has the following advantages: the utility model sets a sampling motor on the mounting plate, uses the sampling motor to push the push plate and drive the sampling probe to extend and retract on the sampling tube, thereby changing the length of the sampling probe, sampling different coal powder sampling points in the coal channel, without manual participation and eliminating external interference factors, realizing full-automatic sampling of coal powder, and improving the uniformity and efficiency of sampling. At the same time, through the setting of the back-blowing valve, sampling valve, etc. by the negative pressure regulating component, the sampling device has better flexibility and operability, and the entire operation process is completed fully automatically by the device, without manual participation and eliminating external interference factors. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front structural schematic diagram of the installation of the sampling box of the utility model;

[0020] Figure 2 It is a side structural diagram of the installation of the sampling box of the utility model;

[0021] Figure 3 It is a structural schematic diagram of the sampling unit in the utility model;

[0022] Figure 4 This is the gas path control principle diagram of the utility model;

[0023] Figure 5 It is a circuit control principle diagram in the utility model. DETAILED DESCRIPTION

[0024] The technical solution of the utility model is described in detail below with reference to the accompanying drawings, but the protection scope of the utility model is not limited to the embodiments.

[0025] Example 1: Figure 1 , Figure 2 The fully automatic coal powder sampling device shown includes a sampling box, which is mounted on the outside of the coal powder pipeline through an inclined support, a human-machine interface is provided on the outside of the sampling box, and the human-machine interface is connected to the control unit. The inside of the sampling box is connected to the coal powder pipeline through a first mounting seat and a second mounting seat. The sampling box is connected to an air source and a power source, and is connected to the inside of the coal powder pipeline through a pressure-inducing pipe.

[0026] The fully automatic coal powder sampling device adopts a hidden telescopic design, which is mainly composed of a sampling unit, an execution unit, and a control unit;

[0027] Sampling unit: mainly composed of a retractable sampler, a cyclone separator, a vibrator, a sampling installation component, a limit auxiliary component, etc.;

[0028] Speed ​​measuring unit: It mainly consists of a jet vacuum pump, a negative pressure regulating component, a pressure and flow rate measuring component, a pressure transmitting pipeline, etc. The pressure and flow rate measuring component includes a wind speed sensor and a differential pressure sensor. The wind speed sensor is installed in the primary air powder tube to measure the flow rate value of the primary air powder tube. The differential pressure sensor is installed at the outlet of the sampling probe of the telescopic sampler to collect the sampling differential pressure value.

[0029] Control unit: mainly composed of human-computer interaction interface, control circuit, gas source control components, etc.

[0030] like Figure 3 The telescopic coal powder sampling device shown in the figure has one end of the sampling tube 10 connected to the cyclone separator 1 through the sampling valve 3, and the other end of the sampling tube 10 is provided with a sampling probe 11, a vibrator 5 is installed on the outer wall of the cyclone separator 1, and a sampling bottle 2 is provided at the bottom of the cyclone separator 1. The sampling tube 10 is fixed in the sampling box through the mounting plate 12, and a sampling motor 13 is fixed on the mounting plate 12. The output end of the sampling motor 13 is connected to the sampling probe 11 through the push plate 15, and the front end of the sampling probe 11 is provided with a sampling hole 14. The compressed air pipe 7 is connected to one end of the emanator 4 through the pressure transmission pipeline 6, and the other end of the emanator 4 is connected to the emanator pipe 9 through the purge valve 8.

[0031] like Figure 4 As shown, the negative pressure regulating component includes a distributor, a negative pressure generator, a regulating valve, a valve plate seat, a purge valve, and a sampling valve. Compressed air enters the distributor through an air connecting pipe, and the negative pressure generator is connected to the distributor through the regulating valve. The output end of the distributor is connected to the valve plate seat. The valve plate seat is provided with solenoid valve 1, solenoid valve 2, solenoid valve 3, and solenoid valve 4. Solenoid valve 1 and solenoid valve 2 are connected to a vibrator, solenoid valve 3 is connected to a sampling valve, and solenoid valve 4 is connected to a back-blowing valve.

[0032] Working principle: negative pressure suction and cyclone separator are used to suck the gas-powder mixture out of the coal powder pipeline and separate solid and gas. When sampling, the control unit starts the collection motor to drive the sampling probe, and the sampling probe faces the coal powder flow in the coal powder pipeline. When the compressed air enters the jet aspirator, its jet action causes the gas-powder mixture in the coal powder pipeline to enter the sampling device along the sampling tube. The gas-powder mixture is separated into solid and gas in the cyclone separator. The vibrator vibrates the coal powder separated in the cyclone separator into the sampling bottle below the cyclone separator, and the gas is sent back into the coal powder pipeline. The entire operation process is completed automatically by the device, without manual participation and free from external interference factors.

[0033] Sampling depth setting: used to set the sampling probe feeding depth, unit MM, please make sure it is smaller than the current powder hose diameter. Otherwise, the sampling probe will be damaged and the device will malfunction; Backflush entry depth: set the sampling probe entry position, unit MM, used to backflush the sampling pipeline and clean the dust inside the pipeline; Backflush origin distance: used to set the distance between the sampling probe and the origin, unit MM; when setting, the relationship between the three must be followed: sampling depth setting > backflush entry depth > backflush origin distance.

[0034] The sampling process is as follows:

[0035] 1. The sampling device is returning to the origin: When the operator starts the sampling device, the sampling device will return to the origin at a relatively slow speed. After returning to the origin, the distance data of the previous sampling will be reset to eliminate the accumulated error and ensure that the sampling data is more accurate.

[0036] 2. The sampling device is moving to the back-blowing position: When the operator starts the sampling device, the sampling device will return to the origin. After returning to the origin, the sampling device starts to move to the back-blowing position in the direction of the pipeline (the default position is 120MM).

[0037] 3. The sampling device is backblowing the pipeline: After the sampling device reaches the backblowing position in the pipeline direction (the default position is 120MM), first close the pressure sampling sensor valve, and then open the backblowing solenoid valve for backblowing.

[0038] 4. The pipeline backflush is completed and the sampling device is moving towards the starting sampling point: When the operator starts the sampling device, the sampling device will return to the origin at a relatively slow speed, but after returning to the origin, the distance data of the previous sampling will be reset to eliminate the accumulated error and ensure that the sampling data is more accurate.

[0039] 5. The sampling device is moving forward for uniform cross-sectional sampling: When the operator starts the sampling device, the sampling device will return to the origin at a relatively slow speed, but after returning to the origin, the distance data of the previous sampling will be reset to eliminate the accumulated error and ensure that the sampling data is more accurate.

[0040] 6. The sampling device is returning to the uniform cross-section sampling: When the operator starts the sampling device, the sampling device will return to the origin at a relatively slow speed, but after returning to the origin, the distance data of the previous sampling will be reset to eliminate the accumulated error and ensure that the sampling data is more accurate.

[0041] 7. The sampling device stops sampling and moves to the backflush position: When the operator starts the sampling device, the sampling device will return to the origin at a relatively slow speed, but after returning to the origin, the distance data of the previous sampling will be reset to eliminate the accumulated error and ensure that the sampling data is more accurate.

[0042] 8. Sampling is completed and the sampling device is backflushing. When the operator starts the sampling device, the sampling device will return to the origin at a relatively slow speed, but after returning to the origin, the distance data of the previous sampling will be reset to eliminate the accumulated error and ensure that the sampling data is more accurate.

[0043] 9. Sampling is completed and returns to the vicinity of the origin: When the operator starts the sampling device, the sampling device will return to the origin at a relatively slow speed, but after returning to the origin, the distance data of the previous sampling will be reset to eliminate the accumulated error and ensure that the sampling data is more accurate.

[0044] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be interpreted as limiting the present invention itself. Various changes can be made to it in form and detail without departing from the spirit and scope of the present invention defined in the appended claims.

Claims

1. Fully automatic coal powder sampling device, characterized by: It includes a sampling box, in which a sampling unit, a velocity measuring unit and a control unit are arranged; the sampling unit includes a telescopic sampler, a cyclone separator and a vibrator, and the velocity measuring unit includes a jet vacuum pump, a negative pressure regulating component, a pressure and flow rate measuring component and a pressure transmission pipeline; The telescopic sampler comprises a sampling tube, a sampling probe and a sampling motor, wherein the sampling motor controls the sampling probe to telescopically move along the sampling tube and controls the sampling probe to be positioned at any one of the origin position, the backflush position and the sampling depth position; One end of the sampling tube is connected to the coal powder pipeline through a first mounting seat, and the other end of the sampling tube is connected to the cyclone separator. The bottom end of the cyclone separator is connected to the sampling tube, and the rapper is installed on the outer wall of the cyclone separator. The compressed air is sent to the jet vacuum pump through the pressure transmitting pipeline. The jet vacuum pump is connected to one end of the jet pipe. The other end of the jet pipe is connected to the pulverized coal pipeline through a second mounting seat. A negative pressure regulating component is provided on the pressure transmitting pipeline. The negative pressure regulating component is connected to the pressure and flow rate measuring component.

2. The fully automatic coal powder sampling device according to claim 1 is characterized in that: The sampling depth position is limited to be smaller than the current pulverized coal pipeline diameter.

3. The fully automatic coal powder sampling device according to claim 1 is characterized in that: The pressure and flow rate measurement component includes a wind speed sensor and a differential pressure sensor; the wind speed sensor is installed in the primary air powder tube to measure the flow rate value of the primary air powder tube; the differential pressure sensor is installed at the outlet of the sampling probe of the telescopic sampler to collect the sampling differential pressure value.

4. The fully automatic coal powder sampling device according to claim 1 is characterized in that: The negative pressure regulating component includes a distributor, a negative pressure generator, a regulating valve, a valve plate seat, a purge valve, and a sampling valve. The compressed air enters the distributor through an air connecting pipe. The negative pressure generator is connected to the distributor through a regulating valve. The output end of the distributor is connected to the valve plate seat. The valve plate seat is provided with solenoid valve 1, solenoid valve 2, solenoid valve 3, and solenoid valve 4. The solenoid valve 1 and solenoid valve 2 are connected to the rapper, the solenoid valve 3 is connected to the sampling valve, and the solenoid valve 4 is connected to the back-blowing valve.

5. The fully automatic coal powder sampling device according to claim 1 is characterized in that: The sampling box is installed to the outside of the coal powder pipeline through an inclined support. A human-machine interface is provided on the outside of the sampling box, which is connected to the control unit. The inside of the sampling box is connected to the coal powder pipeline through the first mounting seat and the second mounting seat.

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