Coal sample detection device and detection method

Abstract

The invention relates to a coal sample detection device and method, and the device comprises a measurement box which is used for weighing and accommodating a coal sample; the temperature measuring component is arranged in the measuring box and is used for monitoring the temperature of the coal sample accommodated in the measuring box; the heating part is used for drying the coal sample in the measuring box to a preset temperature; and the temperature control component is connected with the heating component and is configured to be capable of selecting a corresponding control mode according to the particle size of the coal sample so as to adjust the drying temperature of the heating component on the coal sample. The detection device is easy to operate, the coal sample drying detection process is simpler and more convenient, and the detection device can adapt to coal samples of different types and particle sizes, so that the detection requirements of the coal samples are met.

Description

Technical Field

[0001] The present disclosure relates to the technical field of coal combustion detection, and in particular, to a coal sample detection device and a detection method. Background Art

[0002] Lignite is mainly used for direct combustion to generate electricity, but its high moisture content brings many problems. First, a lot of energy is consumed to evaporate the water during combustion. At the same time, due to the high volatility of lignite, there is a risk of explosion during transportation and pulverization, which increases the difficulty of combustion control. Secondly, the evaporation of water will greatly increase the volume flow of flue gas, and the heat loss of flue gas will also increase accordingly, resulting in a significant decrease in the thermal efficiency of the boiler. In addition, the boiler and its auxiliary equipment such as forced draft fans and coal mills are large in size, and the power consumption will also increase accordingly, further reducing the overall efficiency of the power plant. In terms of transportation, high moisture content not only increases transportation costs, but also limits the transportation capacity of lignite from mining areas to power plants in distant areas. Long-distance transportation may also cause safety problems such as spontaneous combustion and explosion of lignite. Especially in the cold season in the north, excessive moisture can cause lignite to freeze and harden, which brings great difficulties to operation and handling.

[0003] In the related technology, in order to reduce the moisture content of lignite and increase the calorific value, lignite with high moisture content and low calorific value is usually dried and upgraded. This can not only improve the operating efficiency of the boiler, reduce the power consumption of the equipment, and improve the operating economy, but also effectively solve the problems of coal transportation system blockage, coal shortage, poor low-load stable combustion performance, and insufficient load capacity that occur during boiler operation. In addition, the use of steam to dry lignite can make full use of the latent heat of steam vaporization at the low-pressure stage of the turbine to achieve the best system economy, thereby further reducing the coal consumption of the unit for power generation. However, after the lignite is upgraded, its crushing rate and pulverization rate indicators will affect the dust during external transportation, the pulverizing and combustion process of the boiler, so the quality of lignite upgrading needs to be determined within an appropriate range. Summary of the invention

[0004] The purpose of the present disclosure is to provide a coal sample detection device and a detection method, which can at least partially solve the technical problems existing in the related art.

[0005] In order to achieve the above-mentioned object, the first aspect of the present disclosure provides a coal sample detection device, comprising: a measuring box for weighing and holding a coal sample; a temperature measuring component, arranged in the measuring box, to monitor the temperature of the coal sample contained in the measuring box; A heating component, used for drying the coal sample in the measuring box to a preset temperature; and The temperature control component is connected to the heating component and is configured to select a corresponding control mode according to the particle size of the coal sample so as to adjust the drying temperature of the coal sample by the heating component.

[0006] Optionally, there are multiple temperature measuring components, and the multiple temperature measuring components are evenly spaced and arranged in the measuring box.

[0007] Optionally, the temperature measuring component is a thermocouple.

[0008] Optionally, the measuring box is constructed as a long strip box body, and a plurality of the temperature measuring components are arranged at intervals along a diagonal line of the measuring box.

[0009] Optionally, it also includes a temperature display component connected to the plurality of temperature measuring components.

[0010] Optionally, the heating component is a muffle furnace.

[0011] A second aspect of the present disclosure provides a method for detecting a coal sample, comprising: Placing the coal sample in a measuring box, and monitoring the temperature of the coal sample in the measuring box by a temperature measuring component; Placing the coal sample in the measuring box in a heating component for drying, and controlling the drying temperature of the heating component in a corresponding control mode according to the particle size of the coal sample by a temperature control component; and Measure the crushing rate and pulverization rate of coal samples after drying to a preset temperature.

[0012] Optionally, in the step of placing the coal sample in the measuring box and monitoring the temperature of the coal sample in the measuring box by a temperature measuring component, the step further includes: Fill the measuring box with the coal sample and scrape the coal sample on the top of the measuring box flat.

[0013] Optionally, before the step of placing the coal sample in the measuring box and monitoring the temperature of the coal sample in the measuring box by a temperature measuring component, the detection method further comprises: Screening of coal samples of different particle sizes.

[0014] Optionally, after the step of placing the coal sample in the measuring box in a heating component for drying each time, and controlling the drying temperature of the heating component in a corresponding control mode according to the particle size of the coal sample by a temperature control component, the detection method further comprises: The heated and dried coal sample is taken out and weighed to obtain the water loss rate of the coal sample.

[0015] Through the above technical solution, the coal sample is weighed by the measuring box, and then the temperature measuring component measures the coal sample in the measuring box, which can effectively improve the accuracy of subsequent analysis. At the same time, the heating component and the temperature control component accurately control the temperature and drying time according to the particle size of the coal sample, thereby improving the efficiency and accuracy of coal sample detection. The detection device is simple to operate, making the coal sample drying detection process simpler and more convenient, and can adapt to coal samples of different types and particle sizes, thereby meeting the detection needs of coal samples.

[0016] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1 is a schematic structural diagram of a coal sample detection device provided in an exemplary embodiment of the present disclosure; Figure 2-Figure 4 is a flow chart of a coal sample detection method provided by an exemplary embodiment of the present disclosure; Figure 5 is a comparative analysis diagram of water loss rates of coal samples of various particle sizes when the furnace temperature is set at 200° C. in the coal sample detection method provided by the exemplary embodiment of the present disclosure; Figure 6 is a comparative analysis diagram of water loss rates of coal samples with various particle sizes under different furnace temperature conditions in the detection method provided by the exemplary embodiment of the present disclosure; Figure 7 is a comparative analysis diagram of the crushing rates of coal samples of various particle sizes under different furnace temperature conditions in the coal sample detection method provided by the exemplary embodiment of the present disclosure; Figure 8 It is a comparative analysis chart of the pulverization rates of coal samples of various particle sizes under different furnace temperature conditions in the coal sample detection method provided in the exemplary embodiment of the present disclosure.

[0018] Description of Reference Numerals 1- measuring box; 2- temperature measuring component; 3- heating component; 4- temperature control component; 5- temperature display component. DETAILED DESCRIPTION

[0019] In the present disclosure, unless otherwise specified, the directional words used, such as "inside" and "outside", refer to the contours of the corresponding parts. In addition, when the following description refers to the drawings, the same reference numerals in different drawings represent the same or similar elements.

[0020] Reference Figure 1The present disclosure provides a device for detecting the quality of a coal sample, which includes a measuring box 1, a temperature measuring component 2, a heating component 3 and a temperature control component 4. The measuring box 1 can be used to weigh and contain a coal sample. During the detection process, there can be multiple measuring boxes 1. Multiple detection boxes 1 can be used to weigh coal samples of different particle sizes, respectively, or the same measuring box 1 can be used to weigh coal samples of different particle sizes multiple times to ensure that the weight of the coal sample is consistent each time it is tested, thereby ensuring the accuracy of the quality and volume of the coal sample, and facilitating the accuracy of subsequent calculations and analyses. The temperature measuring component 2 can be disposed in the measuring box 1 to monitor the temperature of the coal sample contained in the measuring box 1 through the measuring component 2, thereby facilitating the control of the temperature within a reasonable range during the subsequent drying process to avoid overheating or underheating. The heating component 3 can be used to dry the coal sample in the measuring box 1 to a preset temperature. In the present disclosure, the preset temperature may refer to, for example Figure 7 In the embodiment shown, when the particle sizes of the coal samples of each group are different, the heating component 3 can set the same drying temperature to dry the coal samples, or, when the particle sizes of the coal samples of each group are the same, the heating component 3 can set different drying temperatures for each group of coal samples. When the heating component 3 is used to heat the temperature of the coal sample in the measuring box 1, the coal sample can be moved out of the measuring box 1, thereby effectively avoiding the measuring box 1 from affecting the heating and drying effect of the coal sample in the heating component 3, thereby ensuring the accuracy of the data. The temperature control component 4 can be connected to the heating component 3, and the temperature control component 4 can be configured to select a corresponding control mode according to the particle size of the coal sample to adjust the drying temperature of the coal sample by the heating component 3, so that the detection device can adapt to the drying requirements of coal samples of different particle sizes, effectively increasing the versatility of the detection device.

[0021] Through the above technical solution, the coal sample is weighed by the measuring box 1, and then the coal sample in the measuring box is measured by the temperature measuring component 2, which can effectively improve the accuracy of subsequent analysis. At the same time, the heating component 3 and the temperature control component 4 accurately control the temperature and drying time according to the particle size of the coal sample, thereby improving the efficiency and accuracy of coal sample detection. The detection device is simple to operate, making the coal sample drying detection process simpler and more convenient, and can adapt to coal samples of different types and particle sizes, thereby meeting the detection needs of coal samples.

[0022] Reference Figure 1 The number of the temperature measuring components 2 can be multiple, and multiple measuring components can effectively improve the measurement accuracy.

[0023] In the embodiment provided by the present disclosure, the temperature measuring component 2 can be a thermocouple. Since the thermocouple has strong stability, when the thermocouple is in direct contact with the coal sample, the two will not affect each other, thereby ensuring that the measuring component 2 has a high measurement accuracy. In addition, the thermocouple structure is small, and will not occupy too much internal space of the measuring box 1, and a larger number of thermocouples can be arranged in a limited installation space to meet the measurement requirements.

[0024] Further, refer to Figure 1 The measuring box 1 can be constructed as a long strip box body. The long strip design can arrange more temperature measuring components 2 in a limited space to increase the number of measuring points. Multiple temperature measuring components 2 can be arranged at intervals along the diagonal of the measuring box 1. In this way, the entire measuring area in the measuring box 1 can be effectively covered, reducing the error caused by local temperature changes, thereby providing more accurate temperature data. In the embodiment provided by the present disclosure, the measuring box 1 can be made of metal to ensure the structural strength of the measuring box 1.

[0025] Reference Figure 1 The detection device may further include a temperature display component 5 connected to the plurality of temperature measuring components 2. The temperature display component 5 may be a temperature display, and the operator may intuitively see the current temperature state of the coal sample to accurately collect the coal sample parameters of the measuring box 1, thereby facilitating the control and monitoring of the drying temperature of the coal sample according to the temperature of the coal sample in the measuring box 1.

[0026] Reference Figure 2-Figure 4 According to the second aspect of the present disclosure, a detection method is also provided. The method uses the above-mentioned detection device and has all the beneficial effects of the detection device, which will not be repeated here. The method provided by the present disclosure may include step S100, step S200 and step S400 in sequence. In step S100, the temperature of the coal sample in the measuring box 1 is monitored by the temperature measuring component 2 to effectively grasp the state of the coal sample and ensure the scientificity and effectiveness of the subsequent drying process. In the present disclosure, step S100 needs to be repeated multiple times, and its purpose is to weigh equal amounts of coal samples of the same or different particle sizes multiple times. For example, each group of coal samples can be weighed in turn by the same measuring box 1, or each group of coal samples can be weighed simultaneously by multiple measuring boxes 1 with the same structure.

[0027] According to the embodiments provided by the present disclosure, Figure 4 In each step S100, the detection method may further include step S102, in which each time the coal sample is placed in the measuring box 1, the measuring box 1 is filled with the coal sample, and the coal sample on the top of the measuring box 1 is scraped flat. Specifically, each time the coal sample is placed in the measuring box 1, the coal sample must first be fully filled to the edge of the measuring box 1 to ensure that there is enough coal sample in the box. After filling, use a scraper or other leveling tool to scrape the coal sample on the top of the measuring box 1 to ensure that the surface is flat and flush with the edge of the measuring box 1. In this way, it can be ensured that the coal samples of the same particle size are consistent in the amount in each test box 1, avoiding measurement errors caused by inconsistent coal sample amounts.

[0028] Reference Figure 4According to the embodiment provided by the present disclosure, before the above-mentioned step S102, step S100 in the detection method provided by the present disclosure may also include step S101, screening out coal samples of different particle sizes so that the coal samples can be packaged according to the detection requirements, thereby improving the accuracy and reliability of the detection results.

[0029] Reference Figure 1 In order to study the coal sample characteristics under different particle sizes and temperature conditions, the coal sample in the measuring box 1 can be placed in the heating component 3 for drying through step S200. In the embodiment provided by the present disclosure, when the particle sizes of each group of coal samples are different, the temperature control component 4 can control the heating component 3 to heat and dry the coal samples at the same temperature, and the influence of the furnace temperature and the coal sample particle size on the drying efficiency and drying time can be observed and analyzed. When the particle sizes of each group of coal samples are the same, the temperature control component 4 can heat and dry the coal samples at different temperatures, and the influence of temperature on the drying rate, drying effect and subsequent performance of the coal samples can be analyzed. According to the embodiment provided by the present disclosure, the heating component 3 can be a muffle furnace, which can provide uniform temperature distribution, ensure that the coal sample is heated evenly during the entire drying process, and avoid local overheating or underheating. In addition, the muffle furnace can work stably at a higher temperature, is suitable for a working environment that requires high temperature drying, and provides a wider temperature adjustment range. By cooperating with the muffle furnace and the temperature control component, the repeatability and accuracy of the experiment can be effectively improved.

[0030] Reference Figure 3 The detection method provided in the present disclosure may further include a step S400 after step S300, in which the coal sample after screening and weighing is measured to determine the crushing rate and pulverization rate of the coal sample. It should be noted that in the present disclosure, the crushing rate refers to the percentage of crushed coal samples with a particle size smaller than the minimum particle size of the raw coal in the total coal sample after the coal sample is dried, and the pulverization rate refers to the percentage of coal samples with a particle size smaller than 1 mm in the total coal sample after the coal sample is dried.

[0031] Combination Figure 7 , Figure 7 Part a in the figure is the crushing rate of coal samples with different particle sizes at 300℃. Figure 7 Part b in the figure is the crushing rate of coal samples with different particle sizes at 400°C. By statistically calculating the quantitative relationship between coal sample particle size, final drying temperature and crushing rate, it can be seen that with the increase of final drying temperature, the crushing rate gradually increases; under higher final drying temperature conditions, the crushing rate significantly increases with the increase of particle size.

[0032] Combination Figure 8 , Figure 8 The a part in the graph is the pulverization rate of coal samples with different particle sizes at 200℃. Figure 8Part b in the figure is the pulverization rate of coal samples with different particle sizes at 200°C. By statistically calculating the quantitative relationship between coal sample particle size, final drying temperature and pulverization rate, it can be seen that with the increase of final drying temperature, the pulverization rate gradually increases; the pulverization rate of coal samples with a particle size of 6-13mm is the largest at both furnace temperatures. Therefore, when crushing raw coal, the proportion of 6-13mm coal samples should be reduced to reduce the pulverization rate.

[0033] Reference Figure 2 The detection method provided in the present disclosure may further include a step S300 after step S200, in which the coal sample after heating and drying is taken out and weighed to obtain the water loss rate of the coal sample. In the present disclosure, the water loss rate refers to the degree of water removal in the coal sample during the drying process.

[0034] In the embodiments provided in the present disclosure, Figure 5 By counting and calculating the quantitative relationship between coal sample particle size, final drying temperature and water loss rate, it can be seen that when the furnace temperature is 200℃, the water loss rate of coal samples of various particle sizes increases with the increase of the terminal drying temperature, indicating that at higher terminal drying temperatures, the effect of particle size on water loss rate is significantly different, and large particles have a low water loss rate due to their small specific surface area. At furnace temperatures of 300℃ and 400℃, due to the increase in heating intensity, the effect of particle size on water loss rate is not obvious (not shown in the figure).

[0035] Combination Figure 6 , Figure 6 Part a in the middle shows the water loss rate of coal samples with particle sizes ranging from 6 to 13 mm under different furnace temperature conditions. Figure 6 Part b in the middle shows the water loss rate of coal samples with particle sizes of 13-25 mm under different furnace temperature conditions. Under lower drying terminal temperature conditions, the water loss rate does not change significantly with furnace temperature; under higher drying terminal temperature conditions, the water loss rate changes greatly with furnace temperature; compared with furnace temperature 300℃, the heating speed of furnace temperature 400℃ is faster, and the time to reach the drying terminal temperature is shorter. The water inside the large particles does not have time to evaporate, so the water loss rate is lower than the water loss rate at furnace temperature 300℃.

[0036] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0037] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0038] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A coal sample detection device, characterized in that: include: a measuring box for weighing and holding a coal sample; a temperature measuring component, arranged in the measuring box, to monitor the temperature of the coal sample contained in the measuring box; A heating component, used for drying the coal sample in the measuring box to a preset temperature; as well as The temperature control component is connected to the heating component and is configured to select a corresponding control mode according to the particle size of the coal sample so as to adjust the drying temperature of the coal sample by the heating component.

2. The detection device according to claim 1, characterized in that: There are multiple temperature measuring components, and the multiple temperature measuring components are evenly spaced and arranged in the measuring box.

3. The detection device according to claim 1 or 2, characterized in that: The temperature measuring component is a thermocouple.

4. The detection device according to claim 2, characterized in that: The measuring box is constructed as a long strip box body, and a plurality of the temperature measuring components are arranged at intervals along the diagonal line of the measuring box.

5. The detection device according to claim 2, characterized in that: It also includes a temperature display component connected to the plurality of temperature measuring components.

6. The detection device according to claim 1, characterized in that: The heating component is a muffle furnace.

7. A method for detecting a coal sample, characterized in that: include: Placing the coal sample in a measuring box, and monitoring the temperature of the coal sample in the measuring box by a temperature measuring component; Placing the coal sample in the measuring box in a heating component for drying, and controlling the drying temperature of the heating component in a corresponding control mode according to the particle size of the coal sample by a temperature control component; and Measure the crushing rate and pulverization rate of coal samples after drying to a preset temperature.

8. The detection method according to claim 7, characterized in that: The step of placing the coal sample in the measuring box and monitoring the temperature of the coal sample in the measuring box by a temperature measuring component further includes: Fill the measuring box with the coal sample and scrape the coal sample on the top of the measuring box flat.

9. The detection method according to claim 7, characterized in that: Before the step of placing the coal sample in the measuring box and monitoring the temperature of the coal sample in the measuring box by the temperature measuring component, the detection method further comprises: Screening coal samples of different particle sizes.

10. The detection method according to claim 9, characterized in that: After the step of placing the coal sample in the measuring box in the heating component for drying each time, and controlling the drying temperature of the heating component in a corresponding control mode according to the particle size of the coal sample by the temperature control component, the detection method further includes: The heated and dried coal sample is taken out and weighed to obtain the water loss rate of the coal sample.

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