An online moisture detection device for coal

Abstract

This utility model provides an online coal moisture detection device, belonging to the field of raw coal sampling technology. It includes a main body and a robotic arm. The main body has a weighing unit and a drying unit. The drying unit includes an air drying unit and a nitrogen drying unit. The air drying unit is used to dry bituminous coal and anthracite, while the nitrogen drying unit is used to dry lignite. The robotic arm is located on one side of the main body and is used to transfer samples. In use, the main body and robotic arm are configured locally at the coal entering the plant / furnace sampling device. The robotic arm places the sample in the weighing unit of the main body for weighing, and then removes and transfers it to the drying unit. This device is applicable to moisture detection of all coal types, enabling timely detection of coal moisture and guiding coal acceptance, storage, and blending. The online coal moisture detection device provided by this utility model solves the problem of inaccurate moisture detection results in existing automatic sample preparation and analysis systems.

Description

Technical Field

[0001] This utility model relates to the field of raw coal sampling technology, specifically to an online coal moisture detection device. Background Technology

[0002] Coal, the "food" of thermal power plants, constitutes their largest cost, accounting for 60-70% of total power generation costs. Accurate acceptance and measurement of coal are crucial for the profitability of these enterprises. The moisture content of coal is a vital indicator for evaluating its economic value, directly impacting the safe and economical operation of the generating unit. Firstly, in terms of economic efficiency, higher moisture content reduces the amount of combustible components in the coal, and moisture is a major factor affecting calorific value during coal purchase and settlement for power plants. Secondly, regarding safe operation, high-moisture coal, due to its poor bulkiness, easily causes coal powder to stick together in the pulverized coal hopper and feeder. If directly fed into the boiler unit, this leads to a decrease in furnace temperature, difficulty in igniting the coal powder, directly affecting the stability of ignition and combustion, and increasing flue gas heat loss, thus reducing boiler efficiency. Therefore, accurately measuring the moisture content of coal is essential for the reasonable evaluation of its economic value.

[0003] Currently, the acceptance process for most coal-fired power plants involves manual sampling on the day the coal arrives. Samples are collected from all batches of coal arriving that day, and sample preparation and testing are carried out the next day. The excessive storage time causes moisture loss in the coal samples, resulting in low total moisture content. However, moisture content is one of the main factors affecting the calorific value of coal when power plants settle accounts for purchased coal. Low moisture content leads to a higher received basis low calorific value used for settlement, causing huge economic losses to power plants. At the same time, the lag in moisture detection makes it difficult to effectively guide the blending and combustion of coal into the furnace, resulting in reduced boiler efficiency and, in severe cases, unscheduled unit shutdowns.

[0004] Chinese patent document CN113551955A discloses a fully automated coal sample preparation and analysis system, including a total moisture determination sample reduction device, an analytical sample pre-drying oven, a hammer crusher, a total moisture determination sample weighing device, an analytical sample reduction device, a roller crusher, a sample barrel cleaning and discarding device, an automatic sample container sealing and sending device, a component sample grinding device, a total moisture determination drying oven, an industrial robot, a sample barrel input / output conveying device, a moisture storage sample container input / output device, a dust removal device, and a robot control unit. The system achieves fully automated control of the sample preparation and analysis process through a PLC system and a robot control unit. The system automatically uploads the measured data, and the computer in the control center performs mathematical statistics based on the uploaded data to obtain the analysis and testing results. At the same time, the system has high efficiency in sample preparation and analysis, timely automatic packaging of stored samples, and convenient operation.

[0005] However, the automatic coal sample preparation and analysis system in the above scheme does not take into account the coal type, and its total moisture determination drying oven adopts a single air drying method, resulting in inaccurate moisture determination results for lignite. Utility Model Content

[0006] Therefore, the technical problem to be solved by this utility model is to overcome the problem of inaccurate moisture detection results in the existing automatic sample preparation and analysis system, thereby providing an online moisture detection device for coal.

[0007] To address the aforementioned technical problems, this utility model provides an online coal moisture detection device, comprising: a main body and a robotic arm. The main body has a weighing unit and a drying unit. The drying unit includes an air drying unit and a nitrogen drying unit. The air drying unit is used to dry bituminous coal and anthracite, and the nitrogen drying unit is used to dry lignite. The robotic arm is disposed on one side of the main body and is used to transfer samples.

[0008] In use, the main body of the equipment and a robotic arm are configured locally at the coal sampling device for incoming coal / furnace coal. The robotic arm places the sample in the weighing unit of the main body of the equipment for weighing, and then removes it and transfers it to the drying unit. Bituminous coal and anthracite are dried using the air drying unit, while lignite is dried using the nitrogen drying unit. It is applicable to the moisture detection of all coal types, enabling timely detection of coal moisture and guiding coal acceptance, storage, and blending. It can accurately and quickly detect the moisture content in coal, and features a compact structure, reasonable design, simple method, ease of operation, and accurate and reliable test results. The online coal moisture detection device provided by this utility model solves the problem of inaccurate moisture detection results in existing automatic sample preparation and analysis systems.

[0009] Optionally, the system further includes a nitrogen generator connected to the nitrogen drying unit, which supplies nitrogen to the nitrogen drying unit. With this configuration, the nitrogen generator can provide a nitrogen source to the nitrogen drying unit, thereby achieving the drying of lignite.

[0010] Optionally, the drying unit includes a drying area, a forced-air heating area, and a sample tray placement area, wherein the sample tray placement area is used to place the dried sample trays. With this configuration, the robotic arm grasps the dried sample trays from the sample tray placement area to hold the samples and places them in the drying area. The forced-air heating area supplies hot air or hot nitrogen into the drying area to achieve sample drying.

[0011] Optionally, the drying unit is provided with several independent drying chambers, some of which are used to form the air drying unit, and others are used to form the nitrogen drying unit. With this configuration, the independent drying chambers of the drying unit can simultaneously dry several samples, improving detection efficiency.

[0012] Optionally, the bottom of the drying sample tray is configured with a sieve structure. This sieve structure allows air or nitrogen to pass through without spilling the sample, thus aiding in sample drying.

[0013] Optionally, the robotic arm is configured with a six-axis structure. With this configuration, the six-axis robotic arm can achieve full-space movement and perform complex trajectory operations.

[0014] Optionally, the robotic arm is equipped with a vision sensor and a force sensor. Through this configuration, the vision sensor and force sensor enable the robotic arm to achieve adaptive grasping and force-controlled assembly, thereby improving the grasping accuracy of the robotic arm.

[0015] Optionally, the end of the robotic arm is equipped with a camera component. With this configuration, the camera component can provide real-time feedback on the position of the robotic arm's end, enabling precise operation and positioning, and improving the robotic arm's operational accuracy.

[0016] Optionally, the main body of the device is equipped with a control unit, which is electrically connected to the weighing unit, the drying unit, and the robotic arm. The control unit is equipped with a data collector and a display screen. Through this configuration, the control unit can operate the robotic arm to perform functions such as sample injection, leveling, weighing, drying, inspection experiments, sample disposal, and test result calculation, enabling the entire testing process to proceed without human intervention, thereby improving the accuracy and efficiency of the testing. The data collector can record the number of dried samples, drying time, drying temperature, and any abnormalities. The display screen can display information such as drying time and remaining time.

[0017] Optionally, the system also includes a sample storage cabinet and a waste collection cabinet, which are positioned circumferentially around the robotic arm. The sample storage cabinet stores samples, and the waste collection cabinet collects discarded samples. With this configuration, samples to be tested can be stored in the sample storage cabinet, retrieved from the cabinet by the robotic arm, and placed on the main body of the device for moisture detection. Discarded samples are then collected in the waste collection cabinet via the robotic arm. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of one embodiment of the online coal moisture detection device provided in this utility model.

[0020] Figure 2 This is a schematic diagram of the working process of an online moisture detection device for coal.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Weighing unit; 2. Air drying unit; 3. Nitrogen drying unit; 4. Robotic arm; 5. Nitrogen generator; 6. Control unit; 7. Sample storage cabinet; 8. Waste disposal cabinet. Detailed Implementation

[0023] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0024] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0027] This embodiment provides the structure of an online moisture detection device for coal that enables rapid and accurate moisture detection, used for detecting the moisture content of coal samples.

[0028] like Figure 1The image shows a specific implementation of an online coal moisture detection device provided in this embodiment, comprising: a main body of the device and a robotic arm 4. The main body of the device has a weighing unit 1 and a drying unit. The drying unit includes an air drying unit 2 and a nitrogen drying unit 3. The air drying unit 2 is used to dry bituminous coal and anthracite, and the nitrogen drying unit 3 is used to dry lignite. The robotic arm 4 is disposed on one side of the main body of the device and is used to transfer samples.

[0029] In use, the main body of the equipment and the robotic arm 4 are configured on-site in the coal sampling device for incoming coal / furnace coal. The robotic arm 4 places the sample in the weighing unit 1 of the main body of the equipment for weighing, and then removes it and transfers it to the drying unit. Bituminous coal and anthracite are dried using the air drying unit 2, while lignite is dried using the nitrogen unit. This device is applicable to the moisture detection of all coal types, enabling timely detection of coal moisture and guiding coal acceptance, storage, and blending. It can accurately and quickly detect the moisture content in coal, and features a compact structure, reasonable design, simple method, easy operation, and accurate and reliable test results. The online coal moisture detection device provided in this embodiment solves the problem of inaccurate moisture detection results in existing automatic sample preparation and analysis systems.

[0030] like Figure 1 As shown, the online coal moisture detection device provided in this embodiment further includes a nitrogen generator, which is connected to the nitrogen drying unit 3 and is used to supply nitrogen to the nitrogen drying unit 3. The nitrogen generator provides a nitrogen source for the nitrogen drying unit 3, enabling the drying of lignite. Alternatively, as an alternative implementation, the nitrogen generator 5 can be replaced with other gas supply devices such as a nitrogen storage tank.

[0031] like Figure 1 As shown, in the online coal moisture detection device provided in this embodiment, the drying unit is provided with a drying area, a forced-air heating area, and a sample tray placement area. The sample tray placement area is used to place the drying sample trays. The robotic arm 4 grabs the drying sample trays from the sample tray placement area to hold the samples and places the samples in the drying area. The forced-air heating area supplies hot air or hot nitrogen to the drying area to dry the samples. Alternatively, as an alternative implementation, the sample tray placement area can be omitted, and a separate sample tray storage cabinet can be provided around the main body of the device.

[0032] like Figure 1As shown, in the online coal moisture detection device provided in this embodiment, the drying unit is equipped with several independent drying chambers. One portion of the drying chambers forms the air drying unit 2, and another portion forms the nitrogen drying unit 3. These independent drying chambers can simultaneously dry several samples, improving detection efficiency. Specifically, the number of drying chambers can be flexibly set according to the actual needs of each enterprise. Alternatively, as an alternative implementation, the drying unit can also be configured as a single chamber, which can switch between air drying and nitrogen drying modes depending on the type of coal being detected.

[0033] like Figure 1 As shown, in the online coal moisture detection device provided in this embodiment, the bottom of the drying sample tray is configured as a sieve structure. The sieve structure at the bottom of the drying sample tray allows air or nitrogen to pass through without spilling the sample, thus aiding in sample drying. Specifically, the sieve mesh size of the drying sample tray is sufficiently small. Alternatively, as an alternative implementation, the drying sample tray can also be configured as a grid structure.

[0034] like Figure 1 As shown, in the online coal moisture detection device provided in this embodiment, the robotic arm 4 is configured as a six-axis structure. The six-axis design of the robotic arm 4 enables full-space movement, allowing it to complete complex trajectory operations, and offers advantages such as good operational sensitivity and high work efficiency. Alternatively, as an alternative implementation, the robotic arm 4 can also be configured as a five-axis, seven-axis, or other structure depending on design requirements.

[0035] like Figure 1 As shown in the embodiment, the online coal moisture detection device is equipped with a vision sensor and a force sensor on the robotic arm 4. The vision sensor and the force sensor enable the robotic arm 4 to achieve adaptive gripping and force-controlled assembly, improving its gripping accuracy. Alternatively, as an alternative implementation, one of the vision sensor and the force sensor can be selected according to the design requirements of the robotic arm 4.

[0036] like Figure 1 As shown in the embodiment, in the online coal moisture detection device, the end of the robotic arm 4 is equipped with a camera component. The camera component can provide real-time feedback on the position of the end of the robotic arm 4, enabling precise operation and positioning, and improving the operational accuracy of the robotic arm 4. Alternatively, as an alternative implementation, the camera component can be omitted, and the robotic arm 4 can be positioned using laser positioning or other methods.

[0037] like Figure 1As shown in this embodiment, the online coal moisture detection device includes a control unit 6 on its main body. The control unit 6 is electrically connected to the weighing unit 1, the drying unit, and the robotic arm 4. The control unit 6 is equipped with a data collector and a display screen. The control unit 6 can operate the robotic arm 4 to perform functions such as sample feeding, leveling, weighing, drying, inspection experiments, sample disposal, and test result calculation, enabling the entire detection process to proceed without human intervention, thus improving accuracy and efficiency. The data collector can record the number of dried samples, drying time, drying temperature, and any abnormalities. The display screen can display drying time, remaining time, and other information. Alternatively, as an alternative implementation, the display screen can be omitted, and the recorded data can be transmitted to a backend computer for observation via the data collector.

[0038] Specifically, the control unit 6 is equipped with a recording and storage function, and a standard communication interface is also provided on the control unit 6, which can upload detection data to the network and realize remote centralized management and control of the fuel intelligent management and control system.

[0039] like Figure 1 As shown, the online coal moisture detection device provided in this embodiment also includes a sample storage cabinet 7 and a waste collection cabinet 8. The sample storage cabinet 7 and the waste collection cabinet 8 are arranged around the circumference of the robotic arm 4. The sample storage cabinet 7 is used to store samples, and the waste collection cabinet 8 is used to collect discarded samples. The sample to be tested can be stored in the sample storage cabinet 7, retrieved from the sample storage cabinet 7 by the robotic arm 4, and placed on the main body of the device for moisture detection. After detection, the discarded sample is placed into the waste collection cabinet 8 by the robotic arm 4 for collection.

[0040] How to use:

[0041] like Figure 1 , Figure 2 As shown, the online coal moisture detection device provided in this embodiment, when in use, the main body of the device and the robotic arm 4 are configured on-site in the coal sampling device for coal entering the plant / furnace. The robotic arm 4 places the sample in the weighing unit 1 of the main body of the device for weighing, and then takes it out and transfers it to the drying unit. Bituminous coal and anthracite are dried by the air drying unit 2, and lignite is dried by the nitrogen unit. The control unit 6 records and stores the data to complete the moisture detection of the coal sample.

[0042] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this utility model.

Claims

1. An online moisture detection device for coal, characterized in that, include: The main body of the equipment has a weighing unit (1) and a drying unit. The drying unit includes an air drying unit (2) and a nitrogen drying unit (3). The air drying unit (2) is used to dry bituminous coal and anthracite, and the nitrogen drying unit (3) is used to dry lignite. A robotic arm (4) is disposed on one side of the main body of the device and is used to transfer samples.

2. The online coal moisture detection device according to claim 1, characterized in that, Also includes: A nitrogen generator is connected to the nitrogen drying unit (3) and is used to supply nitrogen to the nitrogen drying unit (3).

3. The online coal moisture detection device according to claim 1, characterized in that, The drying unit is provided with a drying area, a blower heating area and a sample tray placement area, wherein the sample tray placement area is used to place the dried sample trays.

4. The online coal moisture detection device according to claim 3, characterized in that, The drying area is provided with several independent drying chambers. One part of the drying chambers is used to form the air drying unit (2), and another part of the drying chambers is used to form the nitrogen drying unit (3).

5. The online coal moisture detection device according to claim 3, characterized in that, The bottom of the drying sample tray is configured with a sieve structure.

6. The online coal moisture detection device according to claim 1, characterized in that, The robotic arm (4) is configured as a six-axis structure.

7. The online coal moisture detection device according to claim 6, characterized in that, The robotic arm (4) is equipped with a vision sensor and a force sensor.

8. The online coal moisture detection device according to claim 6, characterized in that, The end of the robotic arm (4) is equipped with a camera component.

9. The online coal moisture detection device according to any one of claims 1-8, characterized in that, The main body of the equipment is provided with a control unit (6), which is electrically connected to the weighing unit (1), the drying unit and the robotic arm (4). The control unit (6) is provided with a data collector and a display screen.

10. The online coal moisture detection device according to any one of claims 1-8, characterized in that, It also includes a sample storage cabinet (7) and a waste disposal cabinet (8), which are arranged around the circumference of the robotic arm (4). The sample storage cabinet (7) is used to store samples, and the waste disposal cabinet (8) is used to collect waste samples.

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