Pipeline type powder sampling device

Abstract

The utility model discloses a pipeline type powder sampling device. The pipeline type powder sampling device comprises a sampling pipe, a side pipe, a driving cylinder, a powder sampling head, a discharging pipe and a sample collecting box, two ends of the sampling pipe are communicated with a tank car discharging pipe; the side pipe is arranged on the side wall of the sampling pipe; the driving cylinder is in driving connection with the powder sampling head; the powder sampling head is telescopically arranged in the side pipe; the side pipe is communicated with a sample collection box pipeline; and the side pipe is provided with a purge gas through hole, and the purge gas through hole is arranged opposite to an inlet of a pipeline communicated with the sample collection box. According to the device, the representativeness of samples and the accuracy of analysis results can be ensured, the sampling working efficiency of the tank truck is improved, and the sampling safety during unloading in the sampling process is improved. And the absolute difference between tank car sampling and stokehole bin sampling is ensured to meet the national standard requirement of calcium sulfate and calcium carbonate analysis repeatability.

Description

Technical Field

[0001] The present application relates to the technical field of limestone transportation, and in particular to a pipeline-type powder sampling device. Background Art

[0002] During boiler operation, exhaust gas generated by the boiler passes through existing exhaust gas treatment equipment to remove the large amount of sulfur dioxide produced by coal combustion. The main absorbent in the exhaust gas treatment equipment is limestone. The calcium carbonate in the limestone reacts with the sulfur dioxide in the boiler at the reaction temperature to produce calcium sulfite, which then undergoes oxidation to produce calcium sulfate. The calcium sulfate is discharged with the boiler slag. The calcium carbonate content in the limestone used has a significant impact on the desulfurization effect. Therefore, it is necessary to control the quality of the limestone raw material to ensure that the boiler exhaust gas emissions meet the standards and avoid environmental pollution risks.

[0003] The limestone is purchased from outside and transported by tank trucks. Due to the large size of the tank, it is impossible to test all the substances in the tank. It is necessary to obtain test results that can reflect the overall quality of the limestone in the tank through sampling in order to evaluate the purchase situation and avoid pollution incidents caused by purchasing unqualified products.

[0004] Sampling and testing are currently primarily conducted in accordance with the national standard GB / T15057.1-94, referencing the automotive sampling method. This is done to determine the calcium carbonate content of each batch of purchased limestone, thereby preventing the adverse impact of substandard limestone on production. The sampling frequency per vehicle is calculated based on the automotive sampling method specified in GB / T15057.1-94. Samples must be collected at the beginning, middle, and end of unloading, with each sample size ranging from 100 to 150g.

[0005] The existing sampling process requires operators to climb onto the feed port on top of the tank truck and insert a sampling gun through the feed port to collect samples. Since the tank truck feed port is relatively small and fixed in position, the fixed sampling point makes it almost impossible to collect representative samples, and the test results cannot reflect the true quality of each batch of limestone. When sampling with the existing method, the sampling personnel need to carry the sampling gun to climb to the top of the tank truck 1 to 2 meters above the ground, which puts them at risk of falling. The existing tank truck only has a ladder on the side that is close to the tank body, making it difficult to go up and down, and according to existing requirements, multiple round trips are required, further increasing the difficulty of sampling.

[0006] During the production process, spot checks are carried out one by one using existing methods. The absolute difference between the calcium carbonate content in the tank truck and the calcium carbonate sampling test results in the furnace warehouse can be as high as 2.24. When the absolute difference exceeds 1, it means that the tank truck sampling test results do not meet the national standard requirements.

[0007] The information disclosed in the background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to ordinary technicians in this field. Utility Model Content

[0008] In response to the above technical problems, the present application provides a pipeline-type powder sampling device to improve the representativeness of the sampling results of each batch of limestone transported by tank trucks and avoid the use of unqualified products.

[0009] The present application provides a pipeline powder sampling device, comprising: a sampling tube, a side tube, a driving cylinder, a powder sampling head, a discharge tube, and a sample collection box; both ends of the sampling tube are connected to the tank truck discharge pipe;

[0010] The side tube is arranged on the side wall of the sampling tube; the driving cylinder and the powder sampling head are driven and connected; the powder sampling head is telescopically arranged in the side tube; the side tube is connected to the sample collection box pipeline; a purge gas through hole is arranged on the side tube, and the purge gas through hole is arranged directly opposite to the inlet of the pipeline connected to the sample collection box.

[0011] Preferably, it comprises: a purge air nozzle; the purge air nozzle is arranged on the purge air through hole and is connected with the air inlet pipeline of the discharge air circuit.

[0012] Preferably, it includes: an air circuit solenoid valve; an air circuit solenoid valve is arranged on the pipeline connecting the purge air nozzle and the air inlet pipeline of the discharge air circuit.

[0013] Preferably, it includes: a pressure sensor and a display; the pressure sensor is arranged on the sampling tube and electrically connected to the display.

[0014] Preferably, it comprises: a feed pipe; the feed pipe is connected to the side pipe and the sample collection box; one end of the feed pipe is arranged opposite to the purge gas through hole.

[0015] Preferably, it comprises: a pressure relief exhaust pipe; the pressure relief exhaust pipe is arranged on the sample collection box and is connected with the side pipe through the sample collection box.

[0016] Preferably, it includes: a PLC control module and a timer; the PLC control module is electrically connected to the pressure sensor, the timer, the air circuit solenoid valve, and the driving cylinder respectively.

[0017] Preferably, it comprises: a connecting rod; one end of the connecting rod is connected to the driving cylinder, and the other end is connected to the powder sampling head.

[0018] Preferably, the section where the lower portion of the discharge pipe communicates with the sample collection box is a transparent section.

[0019] The beneficial effects of this application include:

[0020] 1) The pipeline powder sampling device provided in this application can ensure the representativeness of the sample and the accuracy of the analysis results, improve the efficiency of tank truck sampling, improve the safety of sampling during unloading, and ensure that the absolute difference between the tank truck sampling and the furnace front warehouse sample meets the national standard requirements for the repeatability of calcium sulfate and calcium carbonate analysis.

[0021] 2) The pipeline-type powder sampling device provided in this application is used for sampling. Since sampling is performed during the discharge flow, the distribution uniformity of the sampling points in the limestone in the tank truck is improved, thereby improving the representativeness of the sampling point detection results. After sampling using this method, the absolute difference between the test results of the mixed sample obtained and the test results of the calcium carbonate sample in the furnace pre-bin meets the national standard requirements. The use of this device can accurately reflect the actual situation of the limestone in the tank truck, improving the reliability of the random inspection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the main structure of the pipeline-type powder sampling device in at least one embodiment provided in the present application;

[0023] Figure 2 A schematic front view of a powder sampling head in at least one embodiment provided in this application;

[0024] Figure 3 A schematic side view of a side tube in at least one embodiment provided in this application;

[0025] Figure 4 A schematic end view of a side tube in at least one embodiment provided in this application;

[0026] Figure 5 A schematic diagram of a module in at least one embodiment provided in this application;

[0027] Legend:

[0028] Discharge pipe 1, purge air nozzle 21, air circuit solenoid valve 28, pressure sensor 11, drive cylinder 12, side pipe 23, powder sampling head 13, PLC control module 141, display 14, sampling tube 231, discharge tube 232, sample collection box 122, pressure relief exhaust pipe 123, connecting rod 131, timer 142. DETAILED DESCRIPTION

[0029] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] The controller used in this embodiment is an existing structure, and the control circuit can be implemented through simple programming by technicians in this field. It is common knowledge in this field and is only used without modification. Therefore, the control method and circuit connection will not be described in detail.

[0032] The technical means that are not described in detail in this application and are not used to solve the technical problems of this application are all set according to the common knowledge in this field, and can be implemented in a variety of common knowledge settings.

[0033] See also Figures 1 to 5 The pipeline powder sampling device provided in this application is arranged on the unloading pipe 1 used for unloading the limestone tanker. According to this arrangement, the sampling operation can be completed when the limestone tanker is unloading.

[0034] The device includes: a sampling tube 231, a side tube 23, a powder sampling head 13, a driving cylinder 12, a sample collection box 122, a pressure relief exhaust pipe 123, and a purge air nozzle 21. The sampling tube 231 is connected to the discharge pipe 1 at both ends; the side tube 23 is provided on the side wall of the sampling tube 231; the powder sampling head 13 and the driving cylinder 12 are drivingly connected; the powder sampling head 13 is accommodated and movably disposed within the side tube 23 and, driven by the driving cylinder 12 disposed outside the side tube 23, reciprocates along the side tube 23. A through hole is provided at the top of the side tube 23, on which a purge air nozzle 21 is disposed. The purge air nozzle 21 communicates with the interior of the side tube 23, effectively sweeping the sample within the powder sampling head 13 contained within the side tube 23. A sampling tube 231 is provided at the bottom of the side tube 23, directly opposite the through hole. The sampling tube 231 communicates with the sample collection box 122, allowing the sample to fall into the sample collection box 122 after sweeping and be recovered. To ensure pressure safety, a pressure relief exhaust pipe 123 is provided on the sample collection box 122 to ensure timely pressure relief of the sweeping gas. The pressure relief exhaust pipe 123 communicates with the inner cavity of the side tube 23 through the space above the sample collection box 122, thereby ensuring pressure safety.

[0035] The driving cylinder 12 is controlled by a branch air pipe drawn from the unloading air source and a valve group arranged on the air pipe. The specific setting method is the same as the existing cylinder driving method and will not be repeated here.

[0036] When sampling is needed, the powder sampling head 13 extends into the sampling tube 231 to intercept and capture the limestone powder sample conveyed by the airflow. It then retracts into the side tube 23 to discharge the powder. A purge nozzle 21, located at the top of the side tube 23, facing the discharge tube 232, purges the powder sampling head 13 with gas, blowing the material into the discharge tube 232. The powder sampling head 13 used is a commercially available product, specifically a ￠58 (nylon) model.

[0037] In a specific embodiment, it includes: a pressure sensor 11; the pressure sensor 11 is set on the sampling tube 231, and the pressure sensor 11 can accurately obtain the air pressure change in the discharge pipe 1, thereby accurately opening the driving cylinder 12 for sampling.

[0038] In a specific embodiment, it includes: a connecting rod 131 ; the powder sampling head 13 is connected to the driving cylinder 12 via the connecting rod 131 , thereby achieving sampling under the drive of the driving cylinder 12 .

[0039] In a specific embodiment, the purge gas solenoid valve 28 is provided. The purge gas nozzle 21 is connected to the discharge gas pipeline. The purge gas is turned on and off by controlling the purge gas solenoid valve 28.

[0040] In a specific embodiment, the device includes a display 14, which is electrically connected to the pressure sensor 11 and determines whether to start the driving cylinder 12 for sampling based on the change in the measurement result of the pressure sensor 11. The display 14 is disposed outside the sampling device.

[0041] In one embodiment, the system includes a PLC control module 141 and a timer 142. The PLC control module 141 is electrically connected to the pressure sensor 11, and is electrically connected to the drive cylinder 12, the air circuit solenoid valve 28, and the timer 142. The PLC control module 141 enables automatic timed sampling, thereby obtaining a uniformly distributed mixed sample during unloading.

[0042] In one embodiment, a door is provided on the side wall of the sample collection box 122, and the door is hinged to the sample collection box 122. The door is closed when sampling and is sealed to obtain samples for testing and analysis.

[0043] In one embodiment, the lower portion of the discharge tube 232 that connects to the sample collection box 122 is a transparent section. Made of a transparent material, it facilitates observation of sample discharge. The transparent section is 5 to 8 cm long.

[0044] In one embodiment, the sample collection box 122 is placed on a base with a height of about 5 cm to ensure that the sample is dry and free from moisture.

[0045] The device detects the pressure change in the pipeline through the pressure sensor 11. When there is no material unloading, the current value is 3.6 mA. When there is material unloading, the current value in the pipeline is about 4.3 mA. Then, the powder sampling head 13 arranged in the side tube 23 is driven by the driving cylinder 12 to extend into the sampling tube 231, hook up the material and retract into the side tube 23. The powder sampling head 13 in the side tube 23 is purged through the air outlet pipe arranged above the side tube 23 and facing the discharge pipe 232, and the sample is blown into the sample collection box 122 for sampling. The obtained sample falls into the sample collection box 122 connected to the powder sampling head pipeline. After repeating the above process multiple times, a mixed sample of multiple sampling samples is obtained in the sample collection box 122.

[0046] To ensure that the sampling is not contaminated, a protective room can also be set up on the device to facilitate personnel to enter to maintain sampling, and to prevent samples from leaking and contaminating the environment.

[0047] During the production process, after using this device, the data results of each batch of limestone are shown in the following table:

[0048] Sampling testing time Automatic sampler Furnace warehouse Absolute difference Sampling testing time Automatic sampler Furnace warehouse Absolute difference 23.6.23 92.67 92.84 0.17 23.07.23 94.02 93.64 0.38 23.06.26 93.63 93.88 0.25 23.07.26 93.60 93.36 0.24 23.06.29 94.11 93.69 0.42 23.07.29 93.13 92.78 0.35 23.07.02 92.99 93.30 0.31 23.08.01 93.08 92.86 0.22 23.07.05 94.76 94.38 0.38 23.08.04 93.56 93.48 0.08 23.07.08 93.82 94.11 0.29 23.08.07 92.89 93.14 0.25 23.07.11 93.69 93.51 0.18 23.08.10 93.66 93.52 0.14 23.07.14 94.26 93.94 0.32 23.08.13 93.19 92.97 0.22 23.07.17 94.08 94.16 0.08 23.08.16 93.44 93.21 0.21 23.07.20 92.78 92.80 0.02 23.08.19 94.01 93.88 0.13

[0049] As shown in the table above, the absolute difference between the results obtained by the automatic sampler and those obtained by sampling from the furnace chamber is less than 0.60%, with an average value of only 0.23%, fully meeting the national standard requirements. This shows that using this device for sampling can improve the representativeness of the sampling results and enhance the accuracy of the random inspection results.

[0050] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A pipeline powder sampling device, characterized in that: include: A sampling tube (231), a side tube (23), a driving cylinder (12), a powder sampling head (13), a discharge tube (232), and a sample collection box (122); both ends of the sampling tube (231) are connected to the tank truck discharge pipe (1); The side tube (23) is arranged on the side wall of the sampling tube (231); the driving cylinder (12) and the powder sampling head (13) are drivingly connected; the powder sampling head (13) is telescopically arranged in the side tube (23); the side tube (23) is connected to the sample collection box (122) pipeline; a purge gas through hole is provided on the side tube (23), and the purge gas through hole is arranged opposite to the inlet of the pipeline connected to the sample collection box (122).

2. The pipeline powder sampling device according to claim 1, characterized in that: include: A purge air nozzle (21); the purge air nozzle (21) is arranged on the purge air through hole and is connected to the air inlet pipeline of the discharge air circuit.

3. The pipeline powder sampling device according to claim 2, characterized in that: include: An air circuit electromagnetic valve (28) is provided on a pipeline connecting the purge air nozzle (21) and the air inlet pipeline of the discharge air circuit.

4. The pipeline powder sampling device according to claim 3, characterized in that: include: A pressure sensor (11) and a display (14); the pressure sensor (11) is arranged on the sampling tube (231) and is electrically connected to the display (14).

5. The pipeline powder sampling device according to claim 1, characterized in that: include: A feed pipe (232) is provided; the feed pipe (232) is connected to the side pipe (23) and the sample collection box (122); one end of the feed pipe (232) is arranged opposite to the purge gas through hole.

6. The pipeline powder sampling device according to claim 5, characterized in that: include: Pressure relief exhaust pipe (123); the pressure relief exhaust pipe (123) is arranged on the sample collection box (122) and is connected to the side pipe (23) through the sample collection box (122).

7. The pipeline powder sampling device according to claim 4, characterized in that: include: A PLC control module (141), a timer (142); the PLC control module (141) is electrically connected to the pressure sensor (11), the timer (142), the air circuit solenoid valve (28), and the driving cylinder (12).

8. The pipeline powder sampling device according to claim 4, characterized in that: include: A connecting rod (131); one end of the connecting rod (131) is connected to the driving cylinder (12), and the other end is connected to the powder sampling head (13).

9. The pipeline powder sampling device according to claim 1, characterized in that: The lower portion of the discharge pipe (232) communicating with the sample collection box (122) is a transparent section.

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