JP2022006667A - Coal management device, and coal management method - Google Patents

Abstract

To provide a coal management device and a coal management method that can easily grasp time when a temperature of coal rises to a predetermined temperature and can safely manage the coal.SOLUTION: A coal management device stores a discrimination map that divides coals into a plurality of groups according to a boundary line showing a relation between a temperature rise rate per unit time and a water content obtained by pre-testing data coal with a water content of 10% or more, and a time estimation map that shows multiple groups divided by a reference line showing a relation between the elapsed time and the temperature obtained by pre-testing the data coal, discriminates a group to which a sample belongs by verifying the temperature rise rate per unit time of the sample and the water content of the sample according to the discrimination map, selects the group to which the sample belongs from the time estimation map, and determines a time to reach a predetermined temperature from the reference line that separates the group to which the sample belongs from other groups as well.SELECTED DRAWING: Figure 3

Description

The present invention relates to a coal management device and a coal management method.

The coal stored in the coal storage facility generates heat due to the reaction with oxygen and water in the atmosphere, and may eventually ignite. In recent years, the use of low-grade coal with a low degree of coalification, such as subbituminous coal, is increasing in thermal power generation. Such low-grade coal tends to generate heat more easily than bituminous coal used in conventional thermal power generation, and more careful management is required.

Coal has different heat generation properties not only for the coal type but also for each rod received in the coal storage facility. Therefore, conventionally, a method for evaluating the heat generation property of coal has been proposed. For example, in the evaluation method called the R70 method, about 200 g of coal is placed in an oven to which a constant amount of oxygen is continuously supplied, and the time required for the temperature of the coal to rise from 40 ° C to 70 ° C is measured. Then, the temperature rise rate per unit time is calculated to evaluate the heat generation property of coal. As a pretreatment for putting the coal in the oven, a drying treatment is performed to make the water content of the coal as close to 0% as possible.

Further, in order to safely manage the coal stored in the coal storage facility, the temperature rise prediction system of Patent Document 1 below predicts the number of days for the coal to rise to a predetermined temperature. Specifically, the temperature rise prediction system of Patent Document 1 below includes a coal analyzer for measuring the physical properties of coal and a coal temperature rise simulation device for obtaining the temperature rise property of coal. Further, the coal temperature rise simulation device performs numerical analysis based on the information of the physical properties of coal and the coal storage facility measured by the coal analyzer, and obtains the heat generation property of the coal.

Japanese Unexamined Patent Publication No. 2017-90286

In the temperature rise prediction system of Patent Document 1, the oxidation rate is measured using powdered coal as a sample. In addition, the specific heat and water content are measured using lumpy coal as a sample. Furthermore, the thermal conductivity is measured using lumpy coal as a sample. Therefore, it is necessary to prepare many samples and measure a large amount of data. In addition, complicated arithmetic processing is required.

The present invention has been made in view of the above problems, and provides a coal management device and a coal management method capable of easily grasping the time for the coal to rise to a predetermined temperature and safely managing the coal. With the goal.

In order to achieve the above object, the coal management device according to one aspect of the present disclosure has a temperature rise rate per unit time obtained by preliminarily testing coal for data having a water content of 10% or more, and the water content. A discrimination map that divides coal into multiple groups according to the boundary line that shows the relationship between the rate and the reference line that shows the relationship between the elapsed time and the temperature obtained by testing the coal for data in advance. The time estimation map showing the plurality of the groups is stored, and the temperature rise rate of the sample per unit time and the water content of the sample are collated with the discrimination map to which the sample belongs. The group is discriminated, the group to which the sample belongs is selected from the time estimation map, and the reference line for separating the group to which the sample belongs and the other groups from the reference line to reaching the predetermined temperature. Judge the time.

According to this, the required data is limited to the water content of the sample and the temperature rise rate per unit time, which reduces the labor of preparing and measuring the sample. Further, since the water content of the sample is 10% or more, the labor for bringing the water content close to 0% is reduced. Furthermore, the time required to reach a predetermined temperature can be grasped by the discrimination map and the time estimation map. Therefore, there is no need to perform complicated arithmetic processing.

Further, in order to achieve the above object, the coal management method according to one aspect of the present disclosure includes a sample preparation step of crushing the coal and preparing a sample having a water content adjusted to 10% or more, and the sample. A plurality of groups based on the relationship between the test step of generating heat inside the sample container and calculating the temperature rise rate of the sample per unit time, and the temperature rise rate of the coal per unit time and the water content. The group discrimination step of discriminating the group to which the sample belongs by using the discrimination map divided into the above, and the time estimation step of estimating the time until the sample reaches a predetermined temperature by using the time estimation map. The discrimination map includes the boundary line showing the relationship between the temperature rise rate per unit time and the water content, which was obtained by pre-testing the data coal having a water content of 10% or more. The coal is divided into a plurality of the groups, and in the group discrimination step, the temperature rise rate of the sample per unit time and the water content of the sample are collated with the discrimination map, and the sample is obtained. The group to which the group belongs is discriminated, and the time estimation map shows a plurality of the groups separated by a reference line showing the relationship between the elapsed time and the temperature obtained by testing the coal for data in advance. In the time estimation step, the group to which the sample belongs is selected from the time estimation map, and the temperature reaches the predetermined temperature from the reference line that separates the group to which the sample belongs from the other groups. Determine the time to do.

According to this, the sample to be prepared is limited to the sample used in the test step, and the labor for preparing the sample is reduced. Further, since a sample having a water content of 10% or more is used, the labor for bringing the water content close to 0% is reduced. Furthermore, the time required to reach a predetermined temperature can be grasped by the discrimination map and the time estimation map. Therefore, it is not necessary to perform complicated arithmetic processing.

Further, as a desirable aspect of the coal management method according to one aspect, the sample container is fitted to an outer container having an opening at the upper portion and the outer container to seal the opening of the outer container. The inner container is provided with a lid and an inner container housed in the outer container and provided with an opening at the upper portion. The inner container is a container having a smaller heat capacity than the outer container, and the upper opening is open. It is housed in the outer container in the state.

According to this sample container, even a small amount of sample can generate heat and raise the temperature. Therefore, the amount of sample to be prepared is small, and the labor for preparing the sample is reduced.

According to the coal management device and the coal management method of the present disclosure, it is possible to easily grasp the time for the coal to rise to a predetermined temperature.

FIG. 1 is a flow chart illustrating each process included in the coal management method according to the embodiment. FIG. 2 is a block diagram showing a configuration of a coal heat generation evaluation device and a coal management device according to an embodiment. FIG. 3 is a cross-sectional view showing a cross-sectional shape of the sample container according to the embodiment. FIG. 4 is a diagram showing a discrimination map according to the embodiment. FIG. 5 is a reference diagram when the discrimination map of FIG. 4 is displayed in a normal manner. FIG. 6 is a diagram showing a time estimation map according to an embodiment.

Hereinafter, the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiments for carrying out the following inventions (hereinafter referred to as embodiments). Further, the components in the following embodiments include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those that are in a so-called equal range. Further, the components disclosed in the following embodiments can be appropriately combined.

(Embodiment)
FIG. 1 is a flow chart illustrating each process included in the coal management method according to the embodiment. FIG. 2 is a block diagram showing a configuration of a coal heat generation evaluation device and a coal management device according to an embodiment. FIG. 3 is a cross-sectional view showing a cross-sectional shape of the sample container according to the embodiment. FIG. 4 is a diagram showing a discrimination map according to the embodiment. FIG. 5 is a reference diagram when the discrimination map of FIG. 4 is displayed in a normal manner. FIG. 6 is a diagram showing a time estimation map according to an embodiment.

As shown in FIG. 1, in the coal management method according to the embodiment, the sample preparation step S1 for preparing the sample C (see FIG. 3) and the temperature rise rate (° C./h) per unit time of the sample C are calculated. The time for the sample C to reach a predetermined temperature by the test step S2, the group discrimination step S3 for discriminating the group to which the sample C belongs by the discrimination map 30 (see FIG. 4), and the time estimation map 40 (see FIG. 6). The time estimation step S4 for estimating the above is included. Further, in the test step S2 of the present embodiment, as shown in FIG. 2, an example using the coal heat generation evaluation device 10 will be described. Further, the group discrimination step S3 and the time estimation step S4 of the present embodiment will be described with reference to an example using the coal management device 50. The coal management device 50 may be simply referred to as a management device 50.

(Sample preparation process)
In the sample preparation step S1, coal is collected from the coal storage facility and crushed. Then, the crushed coal is dried and adjusted to a predetermined water content. The target coal type may be any of anthracite, bituminous coal, subbituminous coal, lignite, and lignite. However, in the present embodiment, the subbituminous coal contained in the low-grade coal will be described.

The particle size of the crushed coal sample used in the method for evaluating the spontaneous combustion of coal of the present invention is preferably 90% or more, preferably substantially 100% of the sample, preferably 500 μm or less, and more preferably 300 μm or less. It is preferably 250 μm or less, and more preferably 250 μm or less. After crushing, the coal crushed sample used in the method of the present invention may be sieved so that the size is smaller than a predetermined size, but this sieving may be omitted.

The water content of coal is adjusted by drying it while preventing the coal from igniting, such as with a steam tube dryer. The water content of coal required as sample C is 10% or more. This is because if the water content is less than 10%, it is not possible to determine what kind of group the sample C belongs to by the discrimination map 30 in the group discrimination step S3. After adjusting the water content (%), the water content of the sample C is measured. This is because this sample C is used in the group discrimination step S3. Here, the water content (%) is a value obtained by analysis of the industrial analysis method defined by JIS-M-8812.

(Test process)
In the test step S2, oxygen is supplied to the sample C prepared in the sample preparation step S1 to generate heat, and the temperature is raised from a predetermined initial temperature to a predetermined final temperature. At that time, the time from the predetermined initial temperature to the predetermined final temperature of the sample C is measured. Then, the difference value between the predetermined final temperature and the predetermined initial temperature is divided by the measurement time. As a result, the temperature rise rate (° C./h) per unit time of the sample C is calculated. The predetermined initial temperature is, for example, in the range of 20 ° C to 50 ° C, and the predetermined final temperature is, for example, in the range of 60 to 150 ° C. Similar to the R70 method, the predetermined initial temperature may be 40 ° C. and the predetermined final temperature may be 70 ° C.

As shown in FIG. 2, the coal calorific value evaluation device 10 used in the present embodiment includes an oxygen gas tank 11 for storing oxygen-containing gas (oxidizing gas), a nitrogen gas tank 12 for storing nitrogen gas, and a flow rate temperature control unit. A heating tank 14 to which gas is supplied from the flow rate temperature control unit 13 and a sample container 15 housed in the heating tank 14 are provided.

The flow rate temperature control unit 13 can heat the gas passing through the inside and adjust it to a desired temperature. A first gas supply pipe 20a is provided between the oxygen gas tank 11 and the nitrogen gas tank 12 and the flow rate temperature control unit 13. The upstream portion of the first gas supply pipe 20a is branched into two, and is connected to each of the oxygen gas tank 11 and the nitrogen gas tank 12. The downstream portion of the first gas supply pipe 20a is connected to the flow rate temperature control unit 13. A second gas supply pipe 20b is provided between the flow rate temperature control unit 13 and the heating tank 14. The upstream portion of the second gas supply pipe 20b is connected to the flow rate temperature control unit 13. The downstream portion of the second gas supply pipe 20b penetrates the wall portion of the heating tank 14 and is connected to the sample container 15 arranged inside the heating tank 14.

Further, the first gas supply pipe 20a is provided with control valves 11a and 12a. Therefore, it is possible to select the type of gas to be supplied to the heating tank 14 through the flow rate temperature control unit 13 and adjust the flow rate of the gas. The flow rate temperature control unit 13 opens and closes the control valves 11a and 12a. Further, the flow rate temperature control unit 13 has a sample temperature measuring device 22 (see FIG. 3), and collects temperature data of the sample C. Then, the sample temperature measuring device 22 transmits the temperature rise rate (° C./h) per unit time in the sample C to the management device 50.

The heating tank 14 is a device that houses the sample container 15 and adjusts the temperature inside the sample container 15 according to the temperature of the sample C to keep the sample container 15 warm. For example, the heat medium in the heating tank 14 may be a liquid, but is preferably a gas. Since the second gas supply pipe 20b passes through the inside of the heating tank 14, the gas may be heated inside the heating tank 14 instead of being heated by the flow rate temperature control unit 13.

As shown in FIG. 3, the sample container 15 is supported by the support base 19. The sample container 15 includes an inner container 16 for accommodating the sample C, an outer container 17 for accommodating the inner container 16, and a sealing lid 18 for closing the opening of the outer container 17.

The outer container 17 is a container having a heat retaining property. The outer container 17 has an opening at the upper part and has a bottomed tubular shape. A sealing lid 18 is fitted in the opening at the top of the outer container 17. Therefore, the internal space of the outer container 17 is sealed. Examples of the outer container 17 include a thermos made of glass, stainless steel, or the like (a container in which the space between the inner layer and the outer layer is a vacuum). That is, as the outer container 17, a commercially available thermos bottle (off-the-shelf product) such as a water bottle or a pot can be used. Therefore, the outer container 17 can be inexpensive.

The inner container 16 has an opening at the upper part and has a bottomed tubular shape. The sample C is housed inside the inner container 16. The inner container 16 is housed in the outer container with the upper opening open. That is, the inside of the inner container 16 and the inside of the outer container 17 are in a communicating state. The inner container 16 has a smaller heat capacity than the outer container 17. The heat capacity of the inner container 16 is preferably 0.5 J / K or more and 10.0 J / K or less, more preferably 0.8 J / K or more and 6.0 J / K or less, and 1.0 J / K or less. It is more preferably 5.0 J / K or less. The material of the inner container 16 is preferably a material having a small specific heat and easy processing, and examples thereof include aluminum, iron, and stainless steel. Among these, aluminum is preferable because it is easily deformed and a container having a thin wall thickness (a container having a small heat capacity) can be easily manufactured.

The capacity of the inner container 16 is a size capable of accommodating a predetermined amount of sample C. Here, the predetermined amount of sample C is about 20 g or more and about 80 g or less, preferably about 30 g or more and about 60 g or less, and more preferably about 35 g or more and about 45 g or less. Specifically, the capacity of the inner container 16 is preferably 30 cm ³ or more and 120 cm ³ or less, more preferably 45 cm ³ or more and 90 cm ³ or less, and further preferably 50 cm ³ or more and 70 cm ³ or less.

In the past, if the amount of sample was small, the temperature did not rise and it was not possible to evaluate the heat generation of coal. However, as the sample container 15, a small inner container 16 having a thin wall thickness made of a material having a small specific heat is used, and the inner container 16 is further housed in the outer container 17 in a communicating state. The heating gas introduced into the inside also fills the inside of the outer container 17, and the heat retention of the inner container 16 is sufficiently ensured. Therefore, even at a low temperature of about 40 ° C., a small amount of coal generates heat and the temperature of the coal rises.

The second gas supply pipe 20b, the gas discharge pipe 21, and the sample temperature measuring device 22 penetrate the sealing lid 18. The second gas supply pipe 20b passes through the upper opening of the inner container 16 and its tip is arranged near the bottom of the inner container 16. As a result, oxygen gas is supplied to the sample C from below. The gas discharge pipe 21 discharges the oxygen gas in the outer container 17 to the outside. The tip of the gas discharge pipe 21 slightly protrudes from the lower surface of the sealing lid 18 and is arranged above the outer container 17. Further, the sample temperature measuring device 22 is arranged inside the inner container 16.

Next, a method of using the coal heat generation evaluation device 10 will be described. First, the pulverized sample C is vacuum-dried in an environment of 70 ° C. to adjust the water content of the sample C. Then, after cooling the sample C to room temperature under vacuum, a designated amount of the sample C is filled in the container 16. After filling the sample C, the sealing lid 18 of the inner container 15 is closed while supplying nitrogen gas at room temperature from the gas supply unit 20b, and the sample C is sealed.

Next, the nitrogen gas is switched to the oxygen gas, the oxygen gas is supplied to the sample C, and the sample C is heated. The oxygen gas introduced into the sample C flows upward from the bottom of the inner container 16 and diffuses throughout the sample C. Then, the oxygen gas that has flowed further upward is discharged to the outside from the gas discharge pipe 21 provided so as to penetrate the closed lid 18 of the outer container 17. At this time, the heating oxygen gas is also filled in the outer container 17, the heat retention property in the inner container 16 is enhanced, and the temperature rise of the sample C can be promoted even at a low temperature. It should be noted that the heat retention in the inner container 16 is enhanced by the same action during the initial supply of nitrogen gas.

Further, since the temperature of the sample C rises due to the heat generated by the sample C, the flow rate temperature control unit 13 heats the oxygen gas so as to follow the temperature of the sample C. According to this, the temperature inside the heating tank 14 in which the second gas supply pipe 20b is arranged also rises. This operation is continued, the temperature of the sample C is raised to the predetermined final temperature, and the exothermic property of the coal is measured by the time required for the rise from the predetermined initial temperature to the predetermined final temperature.

(Group discrimination process)
In the group discrimination step S3, the temperature rise rate (° C./h) of the sample C calculated in the test step S2 per unit time and the water content (%) of the sample C at the time of preparation in the sample preparation step S1 are obtained. This is a step of determining which group of coal the sample C belongs to based on the above. In this group discrimination step S3, the discrimination map 30 shown in FIG. 4 is used. In addition, any group of coal refers to a group divided by calorific value, not a group divided by coal type. That is, in the present embodiment, low-grade coal (sub-bituminous coal) is described, but even if it is sub-bituminous coal, the heat-generating property differs depending on the receiving rod, so what kind of heat-generating property the sample C has. It determines whether it belongs to the subbituminous coal group.

As shown in FIG. 2, the coal management device 50 used in the group determination step S3 is, for example, an example of a CPU (Central Processing Unit) 51 which is an example of a processor and an example of a storage means for storing programs and data executed by the CPU. It has a memory 52, and a display unit 53, which is an example of an output means for outputting a result. Further, the management device 50 has a communication wiring 48 connected to the sample temperature measuring device 22 and an information input device 49 such as a keyboard as means for inputting information (data).

The coal management device 50 stores the discrimination map 30 shown in FIG. The vertical axis of the discrimination map 30 is the temperature rise rate (° C./h) per unit time. The horizontal axis of the discrimination map 30 is the water content (%). The discrimination map 30 is provided with boundary lines M1 and M2 extending in the horizontal axis direction to vertically divide the discrimination map 30. In the discrimination map 30 shown in FIG. 4, the water content is disclosed in the range of 0% to more than 20%, but in the coal management method of the present disclosure, the water content is in the range of 10% or more (broken line N). It suffices if it is disclosed in the range on the right side). Similarly, the boundary lines M1 and M2 may be disclosed in a range where the water content is 10% or more.

The boundary lines M1 and M2 are lines set by the data tested in advance. More specifically, coal (low-grade coal) stored in one storage site is crushed, and a plurality of coals (low-grade coal) adjusted to have different water contents are prepared. Then, the temperature rise rate (° C./h) per unit time for each coal (low-grade coal) having a different water content is calculated and plotted (see ○ and ● in FIG. 4). The lines connecting the plurality of plots are the boundary lines M1 and M2. That is, the boundary lines M1 and M2 are the relationship between the temperature rise rate (° C./h) per unit time and the water content (%) obtained by testing coal for data (low-grade coal for data) in advance. It is a line indicating. In the coal management method of the present disclosure, since it is sufficient that the water content of the boundary lines M1 and M2 is disclosed in the range of 10% or more, the data coal (low-grade coal for data) has a water content. 10% or more may be prepared and tested.

In the embodiment, subbituminous coal is used as data coal (low grade coal for data). Further, in the embodiment, two subbituminous coals collected from the storage site are used as data coal (low grade coal for data). Therefore, two boundary lines M1 and M2 are provided on the discrimination map 30. Of the two subbituminous coals with different storage sites, the one with the higher temperature rise rate per unit time (° C / h) is called subbituminous coal 1, and the one with the lower temperature rise rate per unit time (° C / h). Is called sub-bituminous coal 2. That is, the boundary line M1 is formed by connecting plots of the temperature rise rate (° C./h) per unit time of the first subbituminous coals having different water contents. The boundary line M2 consists of plots of the rate of temperature rise (° C./h) per unit time of different second subbituminous coals.

As shown in FIG. 4, the discrimination map 30 is vertically divided by the boundary line M1 and the boundary line M2. In other words, on the discrimination map 30, coal (low-grade coal) is divided into a plurality of groups (three groups R1, R2, R3 in this embodiment). Specifically, it is located above the boundary line M1 and between the boundary line M1 and the boundary line M2 and the high temperature group R1 having a higher temperature rise rate (° C./h) per unit time than the subbituminous coal 1. However, the temperature rise rate per unit time (° C./h) is lower than that of subbituminous coal 1 and higher than that of subbituminous coal 2, which is located below the boundary line N2 and the medium temperature group R2, and the temperature rises per unit time. It is divided into a low temperature group R3 whose rate (° C./h) is lower than that of subbituminous coal 2.

The temperature rise rate (° C./h) per unit time of the sample C is input to the management device 50 from the sample temperature measuring device 22 via the communication wiring 48. Further, the coal (low-grade coal) management device 50 is input to the water content (%) of the sample C via the information input device 49. Then, the management device 50 collates the temperature rise rate (° C./h) per unit time with the water content (%) against the discrimination map 30, and discriminates the group to which the sample C belongs. Specifically, as shown in FIG. 4, when the temperature rise rate (° C./h) per unit time of the sample C is K1 and the water content (%) is K2, the control devices 50 are K1 and K2. The intersection K of the virtual lines drawn from and is searched for on the discrimination map 30. In the discrimination map 30 of the present embodiment, since the intersection K is located between the boundary line M1 and the boundary line M2, it is determined that the sample C belongs to the medium temperature group R2.

According to the above method, the heat generation property of the sample C can be grasped. That is, when the sample C belongs to the high temperature group R1, it can be grasped that it is a coal (low grade coal) having a higher temperature rise rate (° C./h) per unit time than the subbituminous coal 1. Further, when the sample C belongs to the medium temperature group R2, the temperature rise rate per unit time (° C./h) is lower than that of the subbituminous coal 1, and the temperature rise rate per unit time (° C./h) is lower than that of the subbituminous coal 2. ) Is high coal (low grade coal). Further, when the sample C belongs to the low temperature group R3, it can be grasped that it is a coal (low grade coal) having a lower temperature rise rate (° C./h) per unit time than the subbituminous coal 2.

Here, the plots shown in FIG. 4 (see ◯ and ● in FIG. 4) are based on actual experimental results. As shown in FIG. 4, when the water content is less than 10%, the boundary line M1 and the boundary line M2 are separated from each other at the top and bottom, but looking at the plot, the subbituminous coal 1 and the subbituminous coal 2 are the same. The rate of temperature rise (° C./h) per unit time is shown. That is, if the water content (%) of the sample C is less than 10%, grouping cannot be performed. On the other hand, when the water content is 10% or more, even if the same subbituminous coal is used, the difference in heat generation is clear, and it is possible to divide the coal into groups, in other words, to discriminate the heat generation. From the above, in the coal (low grade coal) management method of the present disclosure, the water content of the sample prepared in the sample preparation step is 10% or more. Further, the discrimination map 30 and the boundary lines M1 and M2 may also be disclosed in the range where the water content is 10% or more (the range on the right side of the broken line N).

Further, the discrimination map 30 has a logarithmic vertical axis and is a semi-logarithmic graph. According to this, plots having a water content of 10% or less are arranged in a straight line, and a linear boundary line can be set. By the way, FIG. 5 shows the relationship between the temperature rise rate (° C / h) per unit time of the sub-bituminous coal 1 and the water content (%), and the temperature rise rate (° C / h) per unit time of the sub-bituminous coal 2. It is a map when the relationship between and the water content (%) is represented by a normal graph. As shown in FIG. 5, the plots are discrete and it is difficult to set a linear boundary line. For this reason, the map is a semi-log graph.

(Time estimation process)
The time estimation step S4 is a step of estimating the time for the sample C to reach a predetermined temperature T. An example of the predetermined temperature T is the temperature at which the coal (low-grade coal) of the sample C ignites, but the management method of the present disclosure is not limited to this. For example, the temperature may be set lower than the temperature at which the coal (low-grade coal) of the sample C ignites. When the predetermined temperature T is set to a temperature lower than the ignition temperature, water may be sprinkled at the time when the temperature reaches the temperature to lower the temperature, or the temperature may be used for thermal power generation. .. In the time estimation step S4, the time estimation map 40 shown in FIG. 6 is used. Further, the time estimation step S4 also uses the management device 50 (see FIG. 2).

The management device 50 stores the time estimation map 40. The vertical axis of the time estimation map 40 is the temperature (° C.). The horizontal axis of the time estimation map 40 is the elapsed date (elapsed time). The time estimation map 40 is provided with reference lines L1 and L2 that rise as they are displaced to the right, and the ranges of the high temperature group R1, the medium temperature group R2, and the low temperature group R3 are shown. The starting temperature of the reference lines L1 and L2 is 40 ° C., which is the predetermined initial temperature of the sample C in the test step S2, but may be different. The unit on the horizontal axis of the time estimation map 40 is day, but it may be time.

The reference lines L1 and L2 are created based on the data measured from the pile in which the subbituminous coal 1 and the subbituminous coal 2 are stacked. Specifically, a thermocouple is inserted into the pile of subbituminous coal 1 and the temperature of the pile (coal) that rises with the passage of time is measured. Then, the measured value (° C.) is plotted, and the reference line L1 is formed by connecting the plots. Similarly, a thermocouple is inserted into the pile of the subbituminous coal 2 and the temperature of the pile (coal) that rises with the passage of time is measured. Then, the measured value (° C.) is plotted, and the reference line L2 is formed by connecting the plots. That is, the reference lines L1 and L2 are lines showing the relationship between the elapsed date (elapsed time) and the temperature obtained by testing the data coal (subbituminous coal 1 and subbituminous coal 2) in advance.

The slope of the reference line L1 (displacement amount of the vertical axis with respect to the displacement amount of the horizontal axis) is larger than the slope of the reference line L2. Therefore, the sub-bituminous coal 1 has fewer days to reach a predetermined temperature than the sub-bituminous coal 2. Specifically, the sub-bituminous coal 1 has a time to reach a predetermined temperature T in A days, and the sub-bituminous coal 2 has a number of days to reach a predetermined temperature T in B (B> A) days.

In the time estimation map 40, the high temperature group R1, the medium temperature group R2, and the low temperature group R3 are shown in the regions divided by the reference lines L1 and L2. The high temperature group R1 has a higher temperature rise rate (° C./h) per unit time than the subbituminous coal 1. Therefore, in the time estimation map 40, the high temperature group R1 is positioned in the range on the upper left side of the reference line L1. The medium temperature group R2 has a lower temperature rise rate (° C./h) per unit time than the subbituminous coal 1 and a higher temperature rise rate (° C./h) per unit time than the subbituminous coal 2. Therefore, the medium temperature group R2 is positioned in the range between the reference line L1 and the reference line L2. The low temperature group R3 has a lower temperature rise rate (° C./h) per unit time than the subbituminous coal 3. Therefore, the low temperature group R3 is positioned in the range on the lower right side of the reference line L2.

The management device 50 identifies the position of the group determined to belong to the sample C on the time estimation map 40 after the process corresponding to the group determination step S3, that is, the group to which the sample C belongs is determined. For example, when the sample C is determined to belong to the medium temperature group R2 in the group determination step S3, the location of the medium temperature group R2 on the time estimation map 40 is searched for and the location is specified. According to this, when an attempt is made to set the relational expression K4 between the elapsed date (elapsed time) of the sample C and the temperature on the time estimation map 40, the relational expression K4 passes through the range of the medium temperature group R2. I can think. However, as shown in FIG. 6, the elapsed date corresponding to the intersection K5 where the relational expression K4 of the sample C and the predetermined temperature T intersect, that is, the arrival date K6 at which the predetermined temperature T is reached is unknown. Therefore, next, the reference line that separates the group to which the sample C belongs from the other groups is specified, and the time from the reference line until the predetermined temperature T is reached is determined.

Specifically, the reference line that separates the medium temperature group R2 to which the sample C belongs and the high temperature group R1 is the reference line L1. The elapsed date corresponding to the intersection of the reference line L1 and the predetermined temperature T is the A day. Therefore, it can be seen that the arrival date K6 at which the sample C reaches the predetermined temperature T is later than the A day. Similarly, the reference line that separates the medium temperature group R2 to which the sample C belongs and the low temperature group R3 is the reference line L2. The corresponding elapsed date at the intersection of the reference line L2 and the predetermined temperature T is the B day. Therefore, it can be seen that the arrival date K6 at which the sample C reaches the predetermined temperature T is earlier than the B time. From the above, it is estimated that the arrival date K6 at which the sample C reaches the predetermined temperature T is between the A day and the B day.

In addition, when the sample C belongs to the high temperature group R1, the arrival date when the sample C reaches the predetermined temperature T is estimated to be earlier than the A day. Further, when the sample C belongs to the low temperature group R3, the arrival date when the sample C reaches the predetermined temperature T is estimated to be later than the B day. Then, when the present processing is completed, the management device 50 displays and informs the display unit 53 of the arrival date when the sample C reaches the predetermined temperature T. Although the display unit 53 is used as an example of the output means in the present embodiment, it may be notified by a device that outputs voice.

As described above, in the coal management device 50 of the embodiment, the temperature rise rate per unit time obtained by preliminarily testing the data coal (subbituminous coals 1 and 2) having a water content of 10% or more, and the water content The relationship between the elapsed time and the temperature obtained by preliminarily testing the data coal and the discrimination map 30 that divides the coal into a plurality of groups R1, R2, and R3 by the boundary lines M1 and M2 showing the relationship between the two. A time estimation map 40 showing a plurality of groups R1, R2, and R3 divided by reference lines L1 and L2 indicating the above is stored, and the temperature rise rate of sample C per unit time and the water content of sample C are stored. The groups R1, R2, and R3 to which the sample C belongs are discriminated by collating with the discrimination map 30, and the groups R1, R2, and R3 to which the sample C belongs are selected from the time estimation map 40, and the group to which the sample C belongs. Judge the time it takes to reach the specified temperature from the reference line that separates it from other groups.

According to this, the required data is limited to the water content (%) of the sample C and the temperature rise rate per unit time (° C./h), so that the effort to prepare and measure the sample C is required. Reduces. Further, since the water content of the sample C is 10% or more, the labor for bringing the water content close to 0% is reduced. Further, the discrimination map 30 and the time estimation map 40 can be used to grasp the time required to reach a predetermined temperature. Therefore, there is no need to perform complicated arithmetic processing. From the above, it is possible to easily grasp the time for the coal to rise to a predetermined temperature.

Further, the coal management method of the embodiment is a sample preparation step S1 for preparing a sample C in which the coal is crushed and the water content is adjusted to 10% or more, and the sample C is heated inside the sample container 15 to generate a sample. A test step S2 for calculating the temperature rise rate per unit time of C, and a discrimination map 30 for dividing coal into a plurality of groups R1, R2, and R3 based on the relationship between the temperature rise rate per unit time and the water content. It includes a group discrimination step S3 for discriminating the group to which the sample C belongs, and a time estimation step S4 for estimating the time until the sample C reaches a predetermined temperature by using the time estimation map 40. .. The discrimination map 30 is a boundary line M1 showing the relationship between the temperature rise rate per unit time and the water content obtained by testing coals for data (bituminous coals 1 and 2) having a water content of 10% or more in advance. , M2 divides the coal into a plurality of groups R1, R2, R3. In the group discrimination step S3, the temperature rise rate of the sample C per unit time and the water content of the sample C are collated with the discrimination map 30 to discriminate the group to which the sample C belongs. The time estimation map 40 is a plurality of groups R1 divided by reference lines L1 and L2 showing the relationship between the elapsed time and the temperature, which are obtained by testing coals for data (bituminous coals 1 and 2) in advance. R2 and R3 are shown. The time estimation step S4 selects the group to which the sample C belongs from the time estimation map 40, and determines the time from the reference line for dividing the group to which the sample belongs to the other groups until the temperature reaches a predetermined temperature.

According to this, the sample to be prepared is limited to the sample C used in the test step S2. Therefore, the labor for preparing the sample C can be reduced. Further, since the sample C having a water content of 10% or more is used, the labor for bringing the water content close to 0% can be reduced. Further, the discrimination map 30 and the time estimation map 40 make it possible to grasp the time (arrival date) until the predetermined temperature is reached, and it is not necessary to perform complicated arithmetic processing. From the above, it is possible to easily grasp the time for the coal to rise to a predetermined temperature.

Further, the sample container 15 of the coal management method of the embodiment has an outer container 17 having an opening at the top, a sealing lid 18 that fits into the outer container 17 and seals the opening of the outer container, and an outer container. An inner container 16 housed in a container 17 and provided with an opening at the top is provided. The inner container 16 is a container having a smaller heat capacity than the outer container 17, and is housed in the outer container 17 with the upper opening open.

According to the sample container 15, even a small amount of sample can generate heat and raise the temperature. Therefore, the amount of sample to be prepared is small, and the labor for preparing the sample can be reduced.

Although the embodiment has been described above, the embodiment is an example. In the embodiment of the present disclosure, the number of boundary lines and reference lines shown in the discrimination map and the time estimation map is two, but one or three or more may be used, but the more the boundary lines and reference lines are, the more. preferable. This is because the more the boundary line and the reference line, the more detailed the arrival date of the sample C can be grasped.

Further, the coal management device 50 of the embodiment may constitute a client-server system. That is, the terminal, which is another device, requests information on the time (arrival date) until the coal management device 50 reaches a predetermined temperature, and the coal management device 50 responds to this and reaches the terminal. May be output.

10 Coal heat generation evaluation device 11 Oxygen gas tank 12 Nitrogen gas tank 13 Flow temperature control unit 14 Heating tank 15 Sample container 16 Inner container 17 Outer container 18 Sealed lid 20a 1st gas supply pipe 20b 2nd gas supply pipe 21 Gas discharge pipe 22 Sample temperature measuring device 30 Discrimination map 40 Hours estimation map 50 Coal management device 51 CPU
52 Memory C Sample M1, M2 Boundary line L1, L2 Reference line S1 Sample preparation process S2 Test process S3 Group discrimination process S4 Time estimation process

Claims (3)

A discriminant map that divides coal into multiple groups according to the boundary line showing the relationship between the temperature rise rate per unit time and the water content, which was obtained by testing coal for data with a water content of 10% or more in advance. ,
A time estimation map showing the plurality of the groups separated by a reference line showing the relationship between the elapsed time and the temperature obtained by pre-testing the coal for data.
Remember,
The temperature rise rate per unit time of the sample and the water content of the sample are collated with the discrimination map to discriminate the group to which the sample belongs.
Coal management that selects the group to which the sample belongs from the time estimation map and determines the time required to reach a predetermined temperature from the reference line that separates the group to which the sample belongs from other groups. Device. A sample preparation process for preparing a sample obtained by crushing coal and adjusting the water content to 10% or more.
A test process in which the sample is heated inside the sample container and the temperature rise rate of the sample per unit time is calculated.
A group discrimination step for discriminating the group to which the sample belongs by using a discrimination map for dividing the coal into a plurality of groups based on the relationship between the temperature rise rate per unit time and the water content.
A time estimation step that estimates the time required for the sample to reach a predetermined temperature using a time estimation map, and a time estimation step.
Including
In the discrimination map, the coal is obtained by testing a data coal having a water content of 10% or more in advance, and the coal is formed by a boundary line showing a relationship between the temperature rise rate per unit time and the water content. It is divided into multiple groups,
In the group discrimination step, the temperature rise rate per unit time of the sample and the water content of the sample are collated with the discrimination map to discriminate the group to which the sample belongs.
The time estimation map shows a plurality of the groups divided by a reference line showing the relationship between the elapsed time and the temperature obtained by pre-testing the coal for data.
In the time estimation step, the group to which the sample belongs is selected from the time estimation map, and the temperature is reached from the reference line that separates the group to which the sample belongs from the other groups. How to manage coal to determine the time. The sample container is
An outer container with an opening at the top and
A sealing lid that fits into the outer container and seals the opening of the outer container,
An inner container that is housed in the outer container and has an opening at the top,
Equipped with
The coal management method according to claim 2, wherein the inner container is a container having a heat capacity smaller than that of the outer container, and is housed in the outer container with the upper opening open.

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