Coal expansion pressure measuring device and coal expansion pressure measuring method

Abstract

To provide a coal expansion pressure measurement device capable of improving measurement accuracy of expansion pressure and suppressing short circuit of a heater.SOLUTION: A measurement device includes: a retort 1 having a cuboid-shaped housing chamber 10 for accommodating coal; a thermal insulation chamber 4 for housing the retort 1; electric heaters 2 arranged inside the thermal insulation chamber 4 and outside the retort 1; a pressure measurement device 3 arranged outside the thermal insulation chamber 4; and a pressure receiving rod 50 having a pressure receiving plate 51 at the tip. The side of the first horizontal direction X of the housing chamber 10 is shorter than the side of the second horizontal direction Y and the side of the vertical direction Z. The retort 1 has a pair of first retort sidewalls 12 composed of a side in the second horizontal direction Y and a side in the vertical direction Z. The electric heaters 2 are each located outside the first horizontal direction X of the pair of first retort sidewalls 12. The pressure receiving rod 50 faces the housing chamber 10 through a hole 12h extending from the pressure measurement device 3 in the first horizontal direction X and formed in the first retort sidewall 12, so that pressure from the coal side can be transmitted to the pressure measurement device 3.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a coal swelling pressure measurement device and a coal swelling pressure measurement method. [Background technology]

[0002] The swelling pressure of coal is said to be caused by the gas pressure generated during the coal softening and melting process. A test device capable of measuring the swelling pressure of coal under conditions similar to those of an actual operating furnace is needed. Patent Document 1 discloses a test furnace smaller than an actual furnace. This test furnace has a box-shaped carbonization chamber containing coal, which is composed of four furnace walls (top, bottom, left, and right). One of the left and right furnace walls is a fixed furnace wall, and the other is a movable furnace wall that can move horizontally via wheels. A load cell is connected to the movable furnace wall to enable measurement of the swelling pressure. Electric heaters are installed on the left and right furnace walls, and the coal in the carbonization chamber is heated from the left and right. The document states that a gas seal is installed to surround the furnace walls that make up the box-shaped carbonization chamber. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 6-74659 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned device, the expansion pressure of the coal is connected to a load cell via the movable furnace wall, and therefore there is a possibility of loss of force required to move the movable furnace wall due to resistance from the wheels, etc., and there is thought to be room for improvement in the measurement accuracy of the expansion pressure.

[0005] Furthermore, since the electric heater is placed inside the gas seal together with the coal that generates the gas, in the case of coal that generates a large amount of gas, the generated gas may come into contact with the electric heater, causing the heater to short-circuit, preventing the necessary heating and making it impossible to measure the expansion pressure.

[0006] The present disclosure provides a coal expansion pressure measuring device and a coal expansion pressure measuring method that can improve the measurement accuracy of expansion pressure and prevent heater short-circuiting. [Means for solving the problem]

[0007] The coal expansion pressure measuring device of the present disclosure comprises: a retort having a rectangular storage chamber for storing coal, the storage chamber having a first horizontal side length shorter than the second horizontal side length and the vertical side length; an insulated chamber for storing the retort; an electric heater arranged within the insulated chamber and outside the retort; a pressure measuring device arranged outside the insulated chamber; and a pressure receiving rod having a pressure receiving plate at its tip; the retort has a pair of first retort side walls formed by sides in the second horizontal direction and sides in the vertical direction; the electric heaters are each arranged outside the pair of first retort side walls in the first horizontal direction and radiate heat toward the pair of first retort side walls; the pressure receiving rod extends from the pressure measuring device in the first horizontal direction and faces the inside of the storage chamber through a hole formed in the first retort side wall and is configured to be able to transmit pressure from the coal side to the pressure measuring device. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a side view showing a coal expansion pressure measuring device according to an embodiment of the present invention together with a partial cross-sectional view. FIG. [Figure 2] FIG. 2 is a plan view showing a coal expansion pressure measuring device together with a partial cross-sectional view. [Figure 3] FIG. [Figure 4A] FIG. 10 is a view of one of the pair of first insulating side walls as seen from a line of sight parallel to the first horizontal direction. [Figure 4B] FIG. 10 is a view of the other of the pair of first insulating side walls as seen from a line of sight parallel to the first horizontal direction. DETAILED DESCRIPTION OF THE INVENTION

[0009] The coal expansion pressure measuring device of this embodiment will be described below with reference to the drawings. FIG. 1 is a side view showing the coal expansion pressure measuring device of this embodiment together with a partial cross-section. FIG. 2 is a plan view showing the coal expansion pressure measuring device together with a partial cross-section. FIG. 3 is a perspective view of a retort 1. FIG. 4A is a view of one of the pair of first insulating side walls 41 viewed from a line of sight parallel to the first horizontal direction X. FIG. 4B is a view of the other of the pair of first insulating side walls 41 viewed from a line of sight parallel to the first horizontal direction X.

[0010] 1 to 3, the coal expansion pressure measuring device of this embodiment includes a retort 1 having a storage chamber 10 for storing coal, an electric heater 2 for heating the coal in the retort 1, and a pressure measuring device 3 for measuring the expansion pressure of the coal. In this specification, high temperature refers to the temperature at which coal is heated, and refers to 150 degrees Celsius or higher, and preferably 350 degrees Celsius or higher and 600 degrees Celsius or lower.

[0011] The retort 1 is provided for storing coal in the storage chamber 10 and for the purpose of preventing the coal and gas generated by heating the coal from leaking to any location other than the desired location. The desired location can be, for example, the exhaust destination via an exhaust duct. The undesired location can be, for example, an electric heater. As shown in FIG. 3 , the storage chamber 10 is formed in a rectangular parallelepiped shape to simulate the rectangular parallelepiped shape of an actual operating furnace. The storage chamber 10 refers to a space capable of storing coal. The length W1 of the side of the storage chamber 10 in the first horizontal direction X is shorter than the length L1 of the side of the second horizontal direction Y and the length H1 of the side of the vertical direction Z. The first horizontal direction X and the second horizontal direction Y are perpendicular to each other. The vertical direction Z is perpendicular to the first horizontal direction X and the second horizontal direction Y. In this embodiment, W1 = 60 mm, H1 = 180 mm, and L1 = 140 mm, but this is merely an example and is not limiting. In this embodiment, W1 <L1<H1となっているが、H1=L1でもよく、また、W1

[0012] ​As shown in FIGS. 1 and 3, an exhaust duct 11 for exhausting gas is provided above the accommodation chamber 10 of the retort 1, and gas generated by heating coal can be exhausted via the exhaust duct 11. The retort 1 may be made of any material as long as it has the thermal conductivity to transfer heat from the electric heater 2, is rigid, and does not deform at 600°C (as long as the melting point is higher than 600°C). Examples include metals such as SUS and ceramics. In this embodiment, SUS310S is used, but the material is not limited to this and can be variously changed. This means that the reaction (expansion pressure) of the phenomenon to be measured is completed at 600°C, so the material should not melt due to heat at 600°C.

[0013] As shown in FIGS. 1 to 3, the retort 1 has a pair of first retort side walls 12, a pair of second retort side walls 13, a retort bottom wall 14, and a retort top wall 15. The first retort side wall 12 is formed with a side in the second horizontal direction Y and a side in the vertical direction Z. The second retort side wall 13 is formed with a side in the first horizontal direction X and a side in the vertical direction Z. The retort top wall 15 is provided with an exhaust duct 11 extending upward. The first retort side wall 12, the second retort side wall 13, and the retort bottom wall 14 are fixed to one another to form a bottomed box without a lid. During testing, coal is placed in the bottomed box, and the retort top wall 15 having the exhaust duct 11 is fixed to the bottomed box as a lid with a heat insulating material sandwiched therebetween. The fixing method is to fasten the flanges together using fasteners such as bolts.

[0014] The second retort side wall 13, the retort top wall 15, and the retort bottom wall 14 are covered with a heat insulating material 16, and are configured so that heat from the electric heater 2 is transferred to the coal via the first retort side wall 12. This is to simulate an actual operating furnace.

[0015] The coal expansion pressure measuring device has an insulated chamber 4 that houses the retort 1 in order to effectively heat the coal inside the retort 1. The insulated chamber 4 is formed by being surrounded on all four sides by insulating material. The insulated chamber 4 is formed by a pair of first insulated side walls 41, a pair of second insulated side walls 42, an insulated bottom wall 43, and an insulated top wall 44. The retort 1 is disposed midway between the first insulated side walls 41, and the first insulated side walls 41 and the first retort side wall 12 are spaced apart equidistantly in the first horizontal direction X.

[0016] The electric heater 2 is disposed within the insulating chamber 4 and outside the retort 1. By disposing the electric heater 2 outside the retort 1, it is possible to suppress or prevent gas generated from the coal in the retort 1 from reaching the electric heater 2. By disposing the electric heater 2 within the insulating chamber 4, it is possible to effectively heat the coal. The electric heaters 2 are disposed in pairs, each located outside a pair of first retort side walls 12 in the first horizontal direction X. This allows each electric heater 2 to radiate heat toward the first retort side wall 12. In this embodiment, as shown in FIGS. 4A and 4B , an electric heater 2 is provided on each of the pair of first insulating side walls 41, and the distances from each electric heater 2 to the first retort side wall 12 along the first horizontal direction X are equal. By separating the retort 1 from the electric heater 2, it is possible to heat the coal uniformly. As shown in Figures 4A and 4B, the electric heater 2 is linear, and so in order to heat the coal uniformly through the first retort side wall 12, the electric heater 2 is arranged so that it extends in one direction of the second horizontal direction Y, turns back, extends in the other direction of the second horizontal direction Y, turns back, and then extends in one direction of the second horizontal direction Y again, repeating this process.

[0017] The pressure measuring device 3 is disposed outside the insulation chamber 4. The pressure measuring device 3 is disposed further outward than the retort 1 in the first horizontal direction X. The pressure measuring device 3 is disposed in a position overlapping the retort 1 when viewed in a line of sight parallel to the first horizontal direction X. The pressure measuring device 3 has a load cell using a strain gauge or the like, and a pressure receiving rod 50 is connected to the load cell. The pressure receiving rod 50 extends in the first horizontal direction X and has a pressure receiving plate 51 at its tip. A hole 12h for inserting the pressure receiving rod 50 is formed in one of the pair of first retort side walls 12. The pressure receiving rod 50 extends in the first horizontal direction X from the pressure measuring device 3, which is located outside the insulation chamber 4, into the insulation chamber 4, and faces the inside of the storage chamber 10 via the hole 12h formed in the first retort side wall 12. As a result, the pressure receiving rod 50 is configured to be able to transmit pressure from the coal side inside the storage chamber 10 to the pressure measuring device 3.

[0018] Because the tips of the pressure plate 51 and the pressure rod 50 are exposed to high temperatures, it is best to avoid adopting a structure that inhibits the transmission of expansion pressure along the first horizontal direction X in the connection structure between them. Therefore, in this embodiment, a recess 51h (see FIG. 1) having the same shape as the tip of the pressure rod 50 is provided in the pressure plate 51, and the tip of the pressure rod 50 is inserted into this recess 51h to connect the pressure rod 50 and the pressure plate 51 without using a fastener such as a bolt. The tip surface 50a of the pressure rod 50 and the bottom surface of the recess 51h of the pressure plate 51 that contacts this tip surface 50a are both parallel to the vertical direction Z. This allows the force toward the first horizontal direction X to be transmitted appropriately.

[0019] Furthermore, in this embodiment, the pressure receiving rod 50 is made of ceramic as described below, which is a different material from the load cell side member (made of metal; not shown), and ceramic is a material that lacks flexibility, so the two cannot be fastened together with screws. Therefore, the connection structure between the load cell side member and the base end of the pressure receiving rod 50 is also similarly structured so that the base end of the pressure receiving rod 50 is inserted into a recess formed in the load cell side member, allowing the force in the first horizontal direction X to be transmitted appropriately.

[0020] The first retort side wall 12 and the pressure plate 51 are exposed to high temperatures and therefore experience stress due to expansion. In this embodiment, the hole 12h formed in the first retort side wall 12 and the pressure plate 51 are formed in a circular shape (preferably a perfect circle) when viewed in a line of sight parallel to the first horizontal direction X. This prevents stress generated by thermal expansion from concentrating at specific locations (such as bent portions), thereby improving durability.

[0021] The gap between the hole 12h formed in the first retort side wall 12 and the pressure plate 51 is preferably 1 mm or less in total in one direction. This is because if this value is exceeded, gas will be more likely to leak through the gap. For example, in the vertical direction Z, there are gaps at two locations, top and bottom, and it is preferable that the total of both gaps be 1 mm or less. The same applies to the second horizontal direction Y.

[0022] In this embodiment, the retort 1 is made of SUS. The pressure plate 51 and the pressure rod 50 may also be made of metal such as SUS, which has a melting point higher than 600°C. However, SUS has a relatively high thermal expansion coefficient, and it is preferable to prevent the thermal expansion of the pressure plate 51 and the pressure rod 50 from affecting the measurement of the coal expansion pressure. Therefore, in this embodiment, the pressure plate 51 and the pressure rod 50 are made of ceramic, which has a lower thermal expansion coefficient than SUS. The pressure rod 50 and the pressure plate 51 are made of the same material. More specifically, the pressure plate 51 and the pressure rod 50 are made of silicon nitride. This is because silicon nitride has a lower expansion coefficient [%] than SUS at all temperatures. Furthermore, silicon nitride has a lower thermal conductivity [W / (m·K)] than SUS at all temperatures. In addition to silicon nitride, other ceramics that can be used include silicon carbide, forsterite, zirconia, and alumina. It is preferable that the material of the pressure plate 51 and the pressure rod 50 satisfy at least one of the following (1) to (4). (1) The thermal expansion coefficient between 400 and 800 degrees Celsius is lower than that of the material of the retort. (2) Thermal shock resistance when dropped into water from a temperature difference of 400 to 800 degrees Celsius is 200 MPa or more. (3) High temperature strength of 200 MPa or more at 400 to 800 degrees Celsius. (4) The thermal conductivity between 400 and 800 degrees Celsius is lower than that of the retort material. The above (1) is the thermal expansion coefficient based on the length of 0 degrees Celsius. The above (2) is the three-point bending strength [MPa] after quenching. The above (3) is the three-point bending strength [MPa]. The measurement method in (4) above is based on JIS R1611-1997.

[0023] With the above structure, it is possible to measure the expansion pressure of coal that generates little gas. However, with coal that generates a lot of gas, gas may leak from the gap between hole 12h formed in first retort side wall 12 and pressure plate 51, and the gas may reach electric heater 2. Therefore, in this embodiment, a sheet 6 is provided on the inner surface of the storage chamber 10 of the retort 1 (the inner surface of the first retort side wall 12 in this embodiment), covering the hole 12h of the first retort side wall 12 and the pressure plate 51. The sheet 6 may be made of any material as long as it can be used at high temperatures and is flexible. The sheet 6 in this embodiment is a SUS metal foil. The thickness is 10 μm, but is not limited to this thickness as long as flexibility is ensured. The sheet 6 is preferably attached to the first retort side wall 12 with an adhesive or a pressure-sensitive adhesive sheet or other adhesive means. In this embodiment, cellophane tape is used as the adhesive means, but this is not limiting. The sheet 6 in this embodiment is rectangular when viewed parallel to the first horizontal direction X, but is not limited to this. For example, it may be circular. This sheet can prevent gas from leaking and reaching the electric heater, even when using coal that generates a lot of gas.

[0024] In this embodiment, the following measures are further taken to improve the measurement accuracy of the expansion pressure. The coal expansion pressure measuring device further includes a support rod 60 that is arranged in a position where it sandwiches the retort 1 together with the pressure receiving rod 50, and a support frame 62 that supports the support rod 60 and the pressure measuring device 3. The support rod 60 has a support plate 61 at its tip. The material and shape of the support rod 60 and the support plate 61 are the same as those of the pressure receiving rod 50, but are not particularly limited. The connection structure between the second support portion 62b of the support frame 62, which will be described later, and the support rod 60 is the same as the connection structure between the pressure receiving rod 50 and the member on the load cell side. The support frame 62 is made of metal. The support frame 62 has a first support part 62a that supports the pressure measuring device 3, a second support part 62b that supports the support rod 60, and a base 62c. The first support part 62a and the second support part 62b are connected by the base 62c, and the positional relationship between the first support part 62a and the second support part 62b is fixed. As a result, the positional relationship between the pressure receiving rod 50 and the pressure measuring device 3 is fixed, making it possible to improve the accuracy of measuring the expansion pressure.

[0025] Other than the above, the furnace is similar to a normal test furnace in that it is equipped with a first temperature sensor (not shown) such as a thermocouple arranged in the insulating chamber 4, a second temperature sensor (not shown) such as a thermocouple arranged in the retort 1 and measuring the temperature of the coal, and a control unit (not shown) for controlling the electric heater 2 based on the detection results of these temperature sensors. The first temperature sensor is inserted into the insulating chamber 4 from the first insulating side wall 41. The second temperature sensor is inserted from the first retort top wall 15 so as to reach near the center of the coal in the storage chamber 10. After starting operation, the coal is heated until its temperature reaches the coke-forming temperature (at least 600°C or higher), preferably 800°C. The reduction in expansion pressure is completed at 600°C, so heating to 600°C is sufficient.

[0026] As described above, in this embodiment, the coal expansion pressure measuring device includes a retort 1 having a rectangular parallelepiped storage chamber 10 for storing coal, the length W1 of a side of the storage chamber 10 in the first horizontal direction X being shorter than the length L1 of a side of the storage chamber 10 in the second horizontal direction Y and the length H1 of a side of the storage chamber 10 in the vertical direction Z, an insulating chamber 4 for storing the retort 1, an electric heater 2 disposed within the insulating chamber 4 and outside the retort 1, a pressure measuring device 3 disposed outside the insulating chamber 4, and a pressure receiving rod 50 having a pressure receiving plate 51 at its tip. The apparatus may have a pair of first retort side walls 12 each having a side in the horizontal direction Y and a side in the vertical direction Z, the electric heaters 2 are each positioned outside the pair of first retort side walls 12 in the first horizontal direction X and each radiate heat toward the pair of first retort side walls 12, and the pressure-receiving rod 50 extends from the pressure measuring device 3 in the first horizontal direction X and faces the inside of the storage chamber 10 through a hole 12h formed in the first retort side wall 12, and is configured to be able to transmit pressure from the coal side to the pressure measuring device 3.

[0027] According to this configuration, the storage chamber 10 that stores coal has a rectangular parallelepiped shape, and the sides of the storage chamber 10 in the first horizontal direction X are shorter than the sides in the second horizontal direction Y and the vertical direction Z, making it possible to provide a test furnace that is closer in shape to an actual furnace than a cylindrical test furnace. Furthermore, since the electric heater 2 radiates heat to the first retort side wall 12 that is composed of the sides in the second horizontal direction Y and the sides in the vertical direction Z, the first retort side wall 12 becomes a heating wall that heats the coal, making it possible to reproduce the left and right side heating method of an actual furnace. Furthermore, since the electric heater 2 is placed outside the retort 1 in which the coal is stored, the electric heater 2 is less likely to be exposed to gas, which suppresses or prevents short circuits in the electric heater 2 and enables appropriate heating. Furthermore, since the pressure-receiving rod 50 extends from the pressure measuring device 3 in the first horizontal direction X and faces the inside of the storage chamber 10 of the retort 1, and is structured to directly receive pressure, force loss can be reduced compared to a configuration in which the retort side wall is the pressure-receiving surface, and the measurement accuracy of the expansion pressure can be improved.

[0028] As in this embodiment, a sheet 6 that covers the hole 12h formed in the first retort side wall 12 and the pressure plate 51 may be provided on the inner surface of the storage chamber 10 of the retort 1. According to this configuration, sheet 6 prevents gas generated from coal from escaping between hole 12h formed in first retort side wall 12 and pressure plate 51. Therefore, even with coal that generates a large amount of gas, appropriate heating can be achieved without short-circuiting electric heater 2, and expansion pressure can be measured.

[0029] As in this embodiment, the hole 12h formed in the first retort side wall 12 and the pressure plate 51 may have a circular shape when viewed in a line of sight parallel to the first horizontal direction X. The retort 1 and the pressure plate 51 reach high temperatures as the coal is heated, but by making them circular in shape, which is resistant to stress, durability can be improved.

[0030] As in this embodiment, the pressure plate 51 and the pressure rod 50 may be made of ceramic, which has a lower coefficient of thermal expansion than SUS. According to this configuration, it is possible to reduce the influence of thermal expansion of the pressure-receiving plate 51 and the pressure-receiving rod 50 on the expansion pressure measurement while making the retort have a sturdy configuration.

[0031] As in this embodiment, the pressure plate 51 and the pressure rod 50 may be made of any of silicon nitride, zirconia, and alumina. This configuration makes it possible to measure the expansion pressure appropriately in a high-temperature environment. Among these, silicon nitride is considered to be the most suitable.

[0032] As in this embodiment, the apparatus may include a support rod 60 that is positioned to sandwich the retort 1 together with the pressure-receiving rod 50, and a support frame 62 that supports the support rod 60 and the pressure measuring device 3, and the support frame 62 has a first support portion 62a that supports the pressure measuring device 3 and a second support portion 62b that supports the support rod 60, and the first support portion 62a and the second support portion 62b are connected so that the positional relationship between them remains unchanged. This configuration makes it possible to improve the measurement accuracy of the inflation pressure.

[0033] As in this embodiment, the electric heater 2 may be arranged at a distance from the first retort side wall 12 of the retort 1. According to this configuration, heat from the electric heater 2 reaches the first retort side wall 12 via the space inside the heat insulating chamber 4, making it possible to heat uniformly.

[0034] As in this embodiment, the retort 1 has a pair of second retort side walls 13 formed by a side in the first horizontal direction X and a side in the vertical direction Z, and the pair of second retort side walls 13 may be covered with a heat insulating material. According to this configuration, the pair of first retort side walls 12 mainly transfer heat to the coal, so that a heating method similar to that of an actual operating furnace can be provided, and the measurement accuracy of the coal expansion pressure can be improved.

[0035] The coal expansion pressure measurement method of this embodiment is a coal expansion pressure measurement method using the above-mentioned coal expansion pressure measurement device, in which coal is placed in the storage chamber 10 of the retort 1, heat is radiated from the electric heater 2 toward the pair of first retort side walls 12 to heat the coal placed in the storage chamber 10 of the retort 1, and the expansion pressure of the coal generated by heating is transmitted to the pressure measuring device 3 via the pressure receiving rod 50 and measured.

[0036] Although the embodiments of the present disclosure have been described above with reference to the drawings, the specific configurations should not be considered to be limited to these embodiments. The scope of the present disclosure is defined not only by the description of the above embodiments but also by the claims, and further includes all modifications within the meaning and scope of the claims.

[0037] [Variations] (1) In the above embodiment, the electric heater 2 is attached to the first insulating side wall 41, but this is not limiting. For example, the electric heater 2 may be provided between the first retort side wall 12 and the first insulating side wall 41.

[0038] (2) In the above embodiment, the hole 12h formed in the first retort side wall 12 and the pressure plate 51 have a circular shape when viewed in a direction parallel to the first horizontal direction X, but the shape is not limited to this. Various changes are possible.

[0039] (3) The support frame 62 in the above embodiment can be omitted.

[0040] The structures employed in the above embodiments can be employed in any other embodiment.

[0041] The specific configuration of each part is not limited to the above-described embodiment, and various modifications are possible within the scope of the present disclosure. [Explanation of symbols]

[0042] 1. Retort 10…Containment Room 12...First retort side wall 12h…hole 13...Second retort side wall 2...Electric heater 3...Pressure measuring device 4...Insulated chamber 50...Pressure rod 51...Pressure plate 6...Seat 60...Support rod 61...Support plate 62...Support frame 62a...first support part 62b…Second support part 62c...base X…1st horizontal direction Y…Second horizontal direction Z…Vertical direction

Claims

1. A retort having a rectangular parallelepiped storage chamber for storing coal, the length of a first horizontal side of the storage chamber being shorter than the length of a second horizontal side and the length of a vertical side of the storage chamber; An insulating chamber that accommodates the retort; an electric heater disposed within the thermal insulation chamber and outside the retort; A pressure measuring device disposed outside the heat-insulating chamber; A pressure rod having a pressure plate at its tip; Equipped with The retort has a pair of first retort side walls formed by the second horizontal side and the vertical side, The electric heaters are disposed outside the pair of first retort side walls in the first horizontal direction and radiate heat toward the pair of first retort side walls, the pressure-receiving rod extends from the pressure measuring device in the first horizontal direction, faces the storage chamber through a hole formed in the first retort side wall, and is configured to be able to transmit pressure from the coal side to the pressure measuring device.

2. 2. The coal expansion pressure measuring device according to claim 1, wherein a sheet is provided on an inner surface of the accommodation chamber of the retort to cover the hole formed in the first retort side wall and the pressure plate.

3. 3. The coal expansion pressure measuring device according to claim 1, wherein the hole formed in the first retort side wall and the pressure plate are circular when viewed in a line of sight parallel to the first horizontal direction.

4. 4. The coal expansion pressure measuring device according to claim 1, wherein the pressure plate and the pressure rod are made of a material having a melting point of 600° C. or higher.

5. 5. The coal expansion pressure measuring device according to claim 1, wherein the pressure plate and the pressure rod are made of ceramic having a thermal expansion coefficient lower than that of SUS.

6. 6. The coal expansion pressure measuring device according to claim 5, wherein the pressure plate and the pressure rod are made of any one of silicon nitride, zirconia, and alumina.

7. a support rod arranged in a position to sandwich the retort together with the pressure-receiving rod, and a support frame supporting the support rod and the pressure measuring device, The support frame has a first support part that supports the pressure measuring device and a second support part that supports the support rod, and the first support part and the second support part are connected so that their relative positions are invariable. The coal expansion pressure measuring device according to any one of claims 1 to 6.

8. The coal expansion pressure measuring device according to any one of claims 1 to 7, wherein the electric heater is disposed away from the first retort side wall of the retort.

9. The coal expansion pressure measuring device according to any one of claims 1 to 8, wherein the retort has a pair of second retort side walls constituted by the first horizontal side and the vertical side, and the pair of second retort side walls are covered with a thermal insulating material.

10. A method for measuring coal expansion pressure using a coal expansion pressure measuring device, comprising: The coal expansion pressure measuring device is A retort having a rectangular parallelepiped storage chamber for storing coal, the length of a first horizontal side of the storage chamber being shorter than the length of a second horizontal side and the length of a vertical side of the storage chamber; An insulating chamber that accommodates the retort; an electric heater disposed within the thermal insulation chamber and outside the retort; A pressure measuring device is disposed outside the heat insulating chamber, and a pressure receiving rod having a pressure receiving plate at its tip is provided. The retort has a pair of first retort side walls formed by the second horizontal side and the vertical side, The electric heaters are disposed outside the pair of first retort side walls in the first horizontal direction, the pressure-receiving rod extends from the pressure measuring device in the first horizontal direction, faces the accommodation chamber through a hole formed in the first retort side wall, and is configured to be capable of transmitting pressure from the coal side to the pressure measuring device; The coal expansion pressure measuring method includes: Coal is placed in the storage chamber of the retort; Heat is radiated from the electric heater toward the pair of first retort side walls to heat the coal accommodated in the accommodation chamber of the retort; A method for measuring coal expansion pressure, comprising transmitting the expansion pressure of the coal generated by heating to the pressure measuring device via the pressure receiving rod and measuring the pressure.

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