JP7604331B2 - Coal expansion pressure measuring device and coal expansion pressure measuring method - Google Patents

Description

This disclosure relates to a coal expansion pressure measuring device and a coal expansion pressure measuring method.

It is said that the swelling pressure of coal is caused by the gas pressure generated during the softening and melting process of coal. There is a need for a test device that can measure the swelling pressure of coal under conditions similar to those of an actual operating furnace. Patent Document 1 discloses a test furnace that is smaller than an actual furnace. This test furnace has a box-shaped carbonization chamber for putting coal in, which is composed of four furnace walls, one on the left and right, one of the left and right furnace walls is a fixed furnace wall, and the other left and right furnace wall is a movable furnace wall that can move horizontally via wheels, and a load cell is connected to the movable furnace wall to make it possible to measure the swelling pressure. Electric heaters are provided on the left and right furnace walls, and the coal in the carbonization chamber is heated from the left and right. It is described that a gas seal is provided to surround the furnace walls that make up the box-shaped carbonization chamber.

Japanese Patent Application Publication No. 6-74659

However, in the above device, the coal expansion pressure is connected to a load cell via the movable furnace wall, so there is a possibility of loss of force when moving the movable furnace wall due to resistance from the wheels, etc., and there is room for improvement in the measurement accuracy of the expansion pressure.

In addition, because the electric heater is placed inside the gas seal together with the coal that generates the gas, when using coal that generates a large amount of gas, the generated gas may come into contact with the electric heater, causing the heater to short out, preventing the necessary heating and making it impossible to measure the expansion pressure.

This disclosure provides a coal expansion pressure measurement device and a coal expansion pressure measurement method that can improve the measurement accuracy of expansion pressure and prevent heater short circuits.

The coal expansion pressure measuring device of the present disclosure includes a retort having a rectangular storage chamber for storing coal, the length of the first horizontal side of the storage chamber being shorter than the length of the second horizontal side and the length of the vertical side, an insulated chamber for storing the retort, an electric heater disposed within the insulated chamber and outside the retort, a pressure measuring device disposed 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 with 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 and 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.

FIG. 2 is a side view showing the coal expansion pressure measuring device of the present embodiment together with a partial cross-sectional view. FIG. 2 is a plan view showing a coal expansion pressure measuring device together with a partial cross-sectional view. FIG. FIG. 4 is a view of one of the pair of first insulating side walls as viewed in a direction parallel to the first horizontal direction. 13 is a view of the other of the pair of first insulating side walls as viewed in a direction parallel to the first horizontal direction. FIG.

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 with a partial cross-sectional view. FIG. 2 is a plan view showing the coal expansion pressure measuring device with a partial cross-sectional view. FIG. 3 is a perspective view of the 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.

As shown in Figures 1 to 3, the coal expansion pressure measuring device of this embodiment has 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 the coal is heated, and refers to 150 degrees Celsius or higher, and preferably 350 degrees Celsius or higher and 600 degrees Celsius or lower.

The retort 1 is provided for the purpose of storing coal in the storage chamber 10 and preventing the coal and gas generated by heating the coal from leaking to places other than the desired place. The desired place is, for example, the exhaust destination through an exhaust duct. The place other than the desired place is, 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 means a space in which coal can be stored. The length W1 of the side of the first horizontal direction X of the storage chamber 10 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 an example and is not limited to this. In this embodiment, W1<L1<H1, but H1=L1 may also be satisfied, or W1<H1≦L1 may also be satisfied.

As shown in Figs. 1 and 3, an exhaust duct 11 for exhausting gas is provided at the top of the storage chamber 10 of the retort 1, and the gas generated by heating the coal can be exhausted through the exhaust duct 11. The retort 1 may be made of any material as long as it has the thermal conductivity to transmit heat from the electric heater 2, is rigid, and does not deform at 600 degrees Celsius (as long as the melting point is higher than 600 degrees Celsius). Examples include metals such as SUS and ceramics. In this embodiment, SUS310S is used, but this is not limited to this and various changes are possible. This means that the reaction (expansion pressure) of the phenomenon to be measured is completed at 600 degrees Celsius, so it is sufficient that the material does not melt due to heat at 600 degrees Celsius.

As shown in Figures 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 composed of a side in the second horizontal direction Y and a side in the vertical direction Z. The second retort side wall 13 is composed of 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 each other to form a bottomed box without a lid. During testing, coal is put into the bottomed box, and the retort top wall 15 having the exhaust duct 11 is fixed to the bottomed box with a heat insulating material sandwiched therebetween as a lid. The fixing method is to fasten the flanges together using fasteners such as bolts.

The second retort side wall 13, the retort top wall 15, and the retort bottom wall 14 are covered with 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.

The coal expansion pressure measuring device has an insulated chamber 4 that houses the retort 1 in order to effectively heat the coal in 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 equidistantly spaced apart in the first horizontal direction X.

The electric heater 2 is disposed in the heat-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 in the heat-insulating chamber 4, it is possible to effectively heat the coal. The electric heaters 2 are disposed outside the pair of first retort side walls 12 in the first horizontal direction X, forming a pair. As a result, each of the electric heaters 2 radiates heat toward the first retort side wall 12. In this embodiment, as shown in Figures 4A and 4B, the electric heater 2 is provided on each of the pair of first heat-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 set to be 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, so that in order to uniformly heat the coal 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, repeating this process.

The pressure measuring device 3 is disposed outside the heat insulating chamber 4. The pressure measuring device 3 is disposed outside the retort 1 in the first horizontal direction X. The pressure measuring device 3 is disposed at a position overlapping the retort 1 when viewed from 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 outside the heat insulating chamber 4, reaches the heat insulating chamber 4, and faces the inside of the storage chamber 10 through 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.

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 impedes the transmission of expansion pressure along the first horizontal direction X in the connection structure between the two. Therefore, in this embodiment, a recess 51h (see FIG. 1) of 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 the 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 the 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.

In addition, 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 screwed together. 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 toward the first horizontal direction X to be appropriately transmitted.

The first retort side wall 12 and the pressure plate 51 are exposed to high temperatures and are subjected to 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 from a line of sight parallel to the first horizontal direction X. This makes it possible to prevent the stress generated by thermal expansion from concentrating in specific locations (such as bends), thereby improving durability.

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. If it exceeds this value, gas will be more likely to leak through the gap. For example, in the vertical direction Z, there are two gaps, one above and one below, and it is preferable that the total of both gaps is 1 mm or less. The same applies to the second horizontal direction Y.

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 is a material with a melting point higher than 600° C., but SUS has a relatively high thermal expansion coefficient, and it is preferable to suppress the thermal expansion of the pressure plate 51 and the pressure rod 50 from affecting the measurement of the expansion pressure of the coal. 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. Also, 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 from 400 to 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) The high temperature strength at 400 to 800 degrees Celsius is 200 MPa or more.
(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 a 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.

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 the hole 12h formed in the first retort side wall 12 and the pressure plate 51, and the gas may reach the 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) to cover all of the holes 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 metal foil made of SUS. The thickness is 10 μm, but is not limited to this thickness as long as flexibility can be ensured. The sheet 6 is preferably attached to the first retort side wall 12 by an adhesive means such as an adhesive or an adhesive sheet. In this embodiment, cellophane tape is used as the adhesive means, but is not limited to this. The sheet 6 in this embodiment is rectangular when viewed from a line of sight parallel to the first horizontal direction X, but is not limited to this. For example, it may be circular.
This sheet makes it possible to prevent gas from leaking and reaching the electric heater, even when using coal that produces a lot of gas.

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 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. 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 (to 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, and the accuracy of the measurement of the expansion pressure can be improved.

Other than the above, like a normal test furnace, a first temperature sensor (not shown) such as a thermocouple arranged in the insulation chamber 4, a second temperature sensor (not shown) such as a thermocouple arranged in the retort 1 to measure 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 are provided. The first temperature sensor is inserted into the insulation chamber 4 from the first insulation side wall 41. The second temperature sensor is inserted from the first retort top wall 15 to reach the vicinity of the center of the coal in the storage chamber 10. After starting operation, the coal is heated until it reaches a temperature at which it turns into coke (minimum 600°C or higher), preferably 800°C. The reduction in expansion pressure is completed at 600°C, so it is sufficient to heat the coal to 600°C.

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 the side of the storage chamber 10 in the first horizontal direction X being shorter than the length L1 of the side of the storage chamber 10 in the second horizontal direction Y and the length H1 of the side of the storage chamber 10 in the vertical direction Z, an insulating chamber 4 for storing the retort 1, an electric heater 2 arranged in the insulating chamber 4 and outside the retort 1, a pressure measuring device 3 arranged outside the insulating chamber 4, and a pressure receiving rod 50 having a pressure receiving plate 51 at its tip. The retort 1 is It may also be configured such that the electric heater 2 is disposed outside the pair of first retort side walls 12 in the first horizontal direction X and dissipates 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 capable of transmitting pressure from the coal side to the pressure measuring device 3.

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, so it is possible to provide a test furnace that is closer in shape to an actual furnace than a cylindrical test furnace. In addition, 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 vertical direction Z, the first retort side wall 12 becomes a heating wall that heats the coal, and it is possible to reproduce the left and right side heating method of an actual furnace.
In addition, 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, and short circuits in the electric heater 2 are suppressed or prevented, enabling 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 interior of the storage chamber 10 of the retort 1, and is structured to directly receive pressure, it is possible to reduce force loss and improve the measurement accuracy of the expansion pressure compared to a configuration in which the retort side wall is the pressure-receiving surface.

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 accommodation chamber 10 of the retort 1.
According to this configuration, the sheet 6 prevents gas generated from the coal from escaping between the hole 12h formed in the first retort side wall 12 and the pressure plate 51. Therefore, even if the coal generates a large amount of gas, appropriate heating can be achieved without shorting the electric heater 2, and the expansion pressure can be measured.

As in this embodiment, the hole 12h formed in the first retort side wall 12 and the pressure plate 51 may be circular when viewed in a direction parallel to the first horizontal direction X.
The retort 1 and the pressure plate 51 become very hot as the coal is heated, but by making them circular in shape, which is resistant to stress, it is possible to improve their durability.

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

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

As in this embodiment, the apparatus includes a support rod 60 that is arranged in a position that 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, 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.
According to this configuration, it is possible to improve the measurement accuracy of the expansion pressure.

As in this embodiment, the electric heater 2 may be disposed away from the first retort side wall 12 of the retort 1 .
According to this configuration, the heat from the electric heater 2 reaches the first retort side wall 12 through the space within the insulating chamber 4, making it possible to heat uniformly.

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 thermal 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.

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

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

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

(2) In the above embodiment, the hole 12h formed in the first retort side wall 12 and the pressure plate 51 are circular when viewed from a line of sight parallel to the first horizontal direction X, but are not limited to this. The shape can be changed in various ways.

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

The structures used in each of the above embodiments can be used in any other embodiment.

The specific configuration of each part is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit of this disclosure.

Reference Signs List 1: retort 10: storage chamber 12: first retort side wall 12h: hole 13: second retort side wall 2: electric heater 3: pressure measuring device 4: heat insulating chamber 50: pressure receiving rod 51: pressure receiving plate 6: sheet 60: support rod 61: support plate 62: support frame 62a: first support portion 62b: second support portion 62c: base X: first horizontal direction Y: second horizontal direction Z: vertical direction

Claims (10)

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. The coal expansion pressure measuring device according to claim 1, wherein a sheet is provided on the inner surface of the storage chamber of the retort to cover the hole formed in the first retort side wall and the pressure plate. The coal expansion pressure measuring device according to claim 1 or 2, 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. The coal expansion pressure measuring device according to any one of claims 1 to 3, wherein the pressure plate and the pressure rod are made of a material having a melting point of greater than 600°C. The coal expansion pressure measuring device according to any one of claims 1 to 4, wherein the pressure plate and the pressure rod are made of ceramic, which has a lower thermal expansion coefficient than SUS. The coal expansion pressure measuring device according to claim 5, wherein the pressure plate and the pressure rod are made of silicon nitride, zirconia, or alumina. 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. 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. 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 formed by the first horizontal side and the vertical side, and the pair of second retort side walls are covered with a heat insulating material. 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.