JP6165453B2 - Coal stabilization method and coal stabilization facility - Google Patents

Description

  The present invention relates to a technique for obtaining stabilized, ie, low pyrophoric coal.

  It is known that low-grade coal with a low degree of coalification has higher pyrophoric properties than bituminous coal with a high degree of coalification. As a method of reducing this pyrophoric property, that is, stabilizing low-grade coal (coal), there is a method of slowly reacting low-grade coal (coal) and oxygen at a low temperature (called aging). As a document related to this type of technology, there is, for example, Patent Document 1. In Patent Document 1, a carbonaceous material (for example, low grade coal) is filled in a processing container, and the oxygen-containing gas and the carbonaceous material are contacted in the processing container to partially oxidize the carbonaceous material. The technique of making it be described.

Special Table 2002-506469

  In the above-described process for stabilizing coal such as low-grade coal, if the stabilization speed (aging process speed) can be accelerated, the processing efficiency of highly pyrophoric coal can be improved. That is, the stabilization of coal can be completed within a period that can be industrially realized. If this is realized, industrial use of coal such as low-grade coal having high pyrophoric properties will be promoted, and the coal can be safely transported and stored as fuel for thermal power generation and fuel for iron making. However, Patent Document 1 does not describe any method for accelerating the coal stabilization rate.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a technique capable of accelerating the stabilization speed when stabilizing coal such as low-grade coal.

  The present invention provides a coal filling step of filling a processing vessel with coal, supplying a gas containing oxygen into the processing vessel filled with coal, and bringing the coal into direct contact with the coal, An aging step for oxidizing, and a method for stabilizing coal. This coal stabilization method is characterized in that, in the aging step, the gas supplied into the processing container is adjusted so that the temperature of the coal in the processing container does not exceed 80 ° C.

  The present invention also includes a processing vessel in which coal is filled and coal is partially oxidized by direct contact between the coal and oxygen-containing gas, a blower for supplying the gas to the processing vessel, and the processing vessel And a control means for adjusting the gas supplied into the processing vessel so that the temperature of the coal does not exceed 80 ° C.

  According to the present invention, when stabilizing coal such as low-grade coal, the stabilization rate can be accelerated.

It is a block diagram which shows the stabilization equipment of the coal which concerns on 1st Embodiment of this invention. It is a graph which shows the change of relative humidity when the temperature of the air of 100% of relative humidity rises at 40 degreeC. It is a graph which shows the moisture desorption line of a to-be-processed object (coal). It is a block diagram which shows the stabilization equipment of the coal which concerns on 2nd Embodiment of this invention.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In addition, aging is to partially oxidize a to-be-processed object by making a to-be-processed object and oxygen react slowly at low temperature. Moreover, stabilization of coal is aging treatment of coal which is an object to be treated to reduce its pyrophoric property.

  Coal to be treated is, for example, low-grade coal such as lignite and sub-bituminous coal, which has a lower degree of coalization than bituminous coal, and modified low-grade coal obtained by reforming these low-grade coals. The modified low-grade coal refers to a product obtained by drying (dehydrating) low-grade coal such as lignite. The amount of heat generated is increased by dehydrating low-grade coal. As a method for dehydrating low-grade coal, there is a method called dehydration in oil in which low-grade coal is dehydrated in oil.

(First embodiment)
(Composition of coal stabilization equipment)
A stabilization facility 100 according to a first embodiment of the present invention will be described with reference to FIG. Note that the coal to be treated is referred to as an object to be treated 50. As shown in FIG. 1, the stabilization facility 100 includes a processing container 1 filled with a workpiece 50 and a blower 2 for supplying aging gas to the processing container 1. The aging gas is a gas containing oxygen.

  The processing container 1 is an airtight container, and the shape thereof is not particularly limited, and may be a rectangular parallelepiped shape or a cylindrical shape. In addition, regarding the said processing container 1, the filling port of the to-be-processed object 50 and the discharge port of the to-be-processed object 50 (product) after completion | finish of aging are not shown by FIG. The blower 2 is a general blower.

  The blower 2 and the processing container 1 are connected by a gas supply path 31 and a gas return path 32. The gas supply path 31 and the gas return path 32 are conduits (ducts) serving as gas passages. The gas supply path 31 is a path through which the aging gas is supplied from the blower 2 to the processing container 1, and the gas return path 32 is a path through which the aging gas returns from the processing container 1 to the blower 2. The gas supply path 31 and the gas return path 32 constitute a gas circulation path 30 for circulating the aging gas between the blower 2 and the processing container 1. The aging gas is supplied into the processing container 1 from the lower part of the processing container 1 and exits from the upper part of the processing container 1, for example.

  A heat exchanger 3 (circulation gas cooler) is disposed in the gas supply path 31. The heat exchanger 3 is a cooler for cooling the aging gas supplied from the blower 2 to the processing container 1. A cooling water introduction path 37 (cooling water introduction pipe) for supplying cooling water to the heat exchanger 3 is connected to the heat exchanger 3. A cooling water amount adjusting valve 7 is attached to the cooling water introduction path 37.

  A gas exhaust path 35 (gas exhaust pipe) for exhausting a part of the aging gas is connected to the gas supply path 31 between the heat exchanger 3 and the processing container 1. An exhaust valve 8 is attached to the gas exhaust path 35.

  Connected to the gas return path 32 is an outside air introduction path 36 (outside air introduction pipe) for taking outside air (air) into the gas circulation path 30. An outside air supply valve 6 is attached to the outside air introduction path 36.

  The above-described outside air supply valve 6, exhaust valve 8, and cooling water amount adjustment valve 7 are automatic valves (for example, motorized valves) that can hold the valve opening at an intermediate opening, for example.

  A thermometer 10 for measuring the temperature of the object to be processed 50 filled in the processing container 1 is attached to the processing container 1. Note that the number of thermometers 10 is not limited to one. A plurality of thermometers 10 may be attached.

  In the gas supply path 31, an oxygen concentration meter 11 for measuring the oxygen concentration of the aging gas supplied to the processing container 1, a thermometer 12 for measuring the temperature of the aging gas, and a flow rate of the aging gas. A flow meter 13 for measurement is attached. An oxygen concentration meter 11, a thermometer 12, and a flow meter 13 are attached to the gas supply path 31 on the downstream side of the connection position between the gas exhaust path 35 and the gas supply path 31.

  Further, a thermometer 14 for measuring the temperature of the aging gas exiting the processing container 1 (returned to the blower 2) is attached to the gas return path 32. In the present embodiment, the thermometer 14 is attached to the gas outlet portion of the processing container 1 in the gas return path 32.

  Here, the stabilization equipment 100 of this embodiment includes the control unit 4. The control unit 4 is an example of a control means for adjusting the aging gas supplied into the processing container 1 so that the temperature of the workpiece 50 in the processing container 1 does not exceed 80 ° C., for example.

  The control unit 4 controls the opening / closing and opening of the outside air supply valve 6, the exhaust valve 8, and the cooling water amount adjusting valve 7, and also controls the operation / stop of the blower 2. Signals from the thermometers 10, 12, 14, the oximeter 11, and the flow meter 13 are taken into the control unit 4. A dotted line in the figure indicates an electric signal.

(Operation of stabilization equipment)
Next, the stabilization process of coal (processed object 50) using the stabilization facility 100 will be described. Below, the outline | summary of the stabilization process of coal is described first, Then, it describes about the temperature control of the to-be-processed object in an aging process. In the following description, various valves / blowers are operated by signals from the control unit 4, but various valves / blowers may be operated by a manual operation without using the control unit 4.

<Coal filling process>
A processing object 50 is filled in the processing container 1. The workpiece 50 to be filled is, for example, a solid (briquette) pressed into an oval shape, and one volume thereof is, for example, 20 cm ³ . Moreover, when the low-grade coal, such as lignite, that has not been modified is used as the workpiece 50, the initial temperature is, for example, about 55 ° C. The initial temperature is the temperature of the workpiece 50 immediately before (or immediately after) filling the workpiece 50 into the processing container 1. Note that the workpiece 50 is not limited to the shape and temperature described above.

  The reaction rate of the workpiece 50 immediately before filling into the processing container 1 (or just after filling), that is, in the initial state, with oxygen is, for example, about 10 mg / g / day. A reaction rate of 10 mg / g / day means that 1 g of an object to be treated 50 at 30 ° C. reacts with 10 mg of oxygen per day when placed in air at 30 ° C. with an oxygen concentration of about 21%. Means. Note that the oxygen amount of 10 mg includes oxygen adsorbed on the surface of the workpiece 50 from the gas phase by physical adsorption and chemical adsorption.

  The gas in the system in the initial state is air (atmosphere). The inside of the system means the inside of the processing container 1 and the gas circulation path 30. When the processing object 1 is filled in the processing container 1, oxygen in the air is consumed by the oxidation reaction between oxygen in the air and the processing object 50, and the pressure in the system decreases (the consumption of oxygen is carbon dioxide). This is because it is larger than the production amount of

<Aging process>
When the filling of the processing object 50 into the processing container 1 is completed, the outside air supply valve 6 is opened from the closed state by a signal from the control unit 4 and air (outside air) is taken into the system from the outside air introduction path 36. Then, the blower 2 is operated to circulate the gas (aging gas) in the system. At this time, the exhaust valve 8 is closed, and the amount of intake air from the outside air supply valve 6 into the system gradually decreases with time. The temperature of the gas in the processing container 1 rises due to the heat generated by the oxidation reaction caused by the direct contact between the oxygen in the gas and the workpiece 50 in the processing container 1. However, the opening degree of the cooling water amount adjusting valve 7 is controlled by a signal from the control unit 4, and the aging gas is cooled to, for example, 40 ° C. by the cooling water in the heat exchanger 3. The gas cooled to 40 ° C. flows through the gas supply path 31 and is supplied to the bottom of the processing container 1. That is, the temperature of the aging gas supplied to the processing container 1 is adjusted to, for example, 40 ° C. by the control unit 4 based on the signal from the thermometer 12.

  Next, the exhaust valve 8 is opened by a signal from the control unit 4, and a part of the aging gas is discharged from the gas exhaust path 35. Thereby, the amount of air taken into the system from the outside air supply valve 6 increases. As a result, the oxygen concentration in the circulating gas (aging gas) gradually increases, and aging (partial oxidation of the workpiece 50) proceeds.

<Coal removal>
When the reaction rate of the workpiece 50 with oxygen reaches a predetermined value, the workpiece 50 is removed from the processing vessel 1. At this time, the workpiece 50 is a low-pyrophoric, that is, stabilized treatment. The processed product is piled at a predetermined location. In addition, the reaction rate with the oxygen of the to-be-processed object 50 is calculated | required as a oxygen consumption amount for the fixed time in a sealed container, sampling a small amount of to-be-processed object 50 from the processing container 1. Further, “piling” means, for example, stacking.

  The reaction rate with oxygen at the end of aging of the workpiece 50 is, for example, about 0.2 mg / g / day. The reaction rate of 0.2 mg / g / day means that when 1 g of processed material at 30 ° C. is placed in air at 30 ° C. with an oxygen concentration of about 21%, it reacts with 0.2 mg of oxygen per day. It means to do. The oxygen amount of 0.2 mg includes oxygen adsorbed on the surface of the processed material from the gas phase and those due to physical adsorption and those due to chemical adsorption.

  The reaction rate of about 0.2 mg / g / day is about the same as that of bituminous coal generally used as a fuel for thermal power generation. If the reactivity with oxygen can be suppressed to this level, The risk of spontaneous ignition is low.

<About the temperature of the workpiece during the aging process>
In order to reduce the reaction rate of the workpiece 50 having a reaction rate with oxygen of about 10 mg / g / day to a reaction rate of about 0.2 mg / g / day, the workpiece 50 is reduced to a predetermined amount. Need to react with oxygen. The predetermined amount (necessary oxygen amount) is, for example, 17 mg / g. 17 mg / g means that it is necessary to react 17 mg of oxygen per 1 g of the workpiece 50. Here, the required amount of oxygen (for example, 17 mg / g) is less affected by the temperature if the temperature of the workpiece 50 is 100 ° C. or lower. That is, if the temperature of the workpiece 50 is 100 ° C. or lower, the required oxygen amount (for example, 17 mg / g) is substantially constant.

  On the other hand, the higher the temperature, the higher the reaction rate, that is, the faster the aging progress rate. However, when the temperature of the object to be processed 50 exceeds 100 ° C., the required oxygen amount becomes more than 17 mg / g. Therefore, if the aging process is performed at a temperature of about 100 ° C., the reaction rate between oxygen and the object to be processed 50 can be kept high while minimizing the required oxygen amount.

  However, aging treatment at 100 ° C. also has the following problems. As the temperature of the circulating gas (aging gas) increases, the relative humidity decreases (the gas dries), and moisture contained in the workpiece 50 that contacts the circulating gas is lost. When the moisture of the workpiece 50 is lost, the workpiece 50 (product) after the aging treatment is exposed to the atmosphere (for example, an atmosphere having a relative humidity of 75%), so that the workpiece 50 removes moisture in the atmosphere. Absorb moisture. At this time, a very large moisture absorption (corresponding to the latent heat of vaporization of water) is generated. This heat of moisture absorption increases the temperature of the object to be processed 50, and the oxidation reaction rate of the object to be processed 50 increases. This can trigger spontaneous ignition.

<Temperature control of workpiece during aging process>
For this reason, in this embodiment, in the aging process, the control unit 4 causes the control unit 4 to supply the circulating gas (for aging) so that the temperature of the workpiece 50 in the processing container 1 does not exceed 80 ° C., for example. By adjusting the gas), the reaction rate between oxygen and the object to be processed 50 is maintained as high as possible while preventing the relative humidity of the aging gas from excessively decreasing. Thereby, when stabilizing coal such as low-grade coal (reducing pyrophoricity), the stabilization rate can be accelerated while ensuring the stabilization of coal.

  Here, it will be described more specifically with reference to FIGS. 2 and 3 that it is effective to prevent the temperature of the workpiece 50 in the processing container 1 from exceeding 80 ° C. As described above, it is assumed that the circulating gas (aging gas) is cooled to, for example, 40 ° C. in the heat exchanger 3 and the relative humidity becomes 100%. When this circulating gas rises in temperature in the processing container 1 due to the oxidation reaction of the workpiece 50, the relative humidity changes as shown in FIG. As can be seen from FIG. 2, when the temperature of the circulating gas increases to 80 ° C., the relative humidity decreases to 16%.

  Refer now to FIG. The initial moisture of the workpiece 50 is, for example, about 6%. According to FIG. 3, when the relative humidity of the circulating gas is up to 16% (corresponding to 80 ° C. in FIG. 2), the moisture is barely maintained, but the relative humidity increases when the temperature of the circulating gas rises above 80 ° C. Decreases (region on the left side in FIG. 3), moisture is lost from the workpiece 50. Therefore, it is not preferable that the temperature of the workpiece 50 exceeds 80 ° C., because the workpiece 50 is dried. That is, by preventing the temperature of the object to be processed 50 in the processing container 1 from exceeding 80 ° C., the reaction rate between oxygen and the object to be processed 50 is reduced while preventing the relative humidity of the aging gas from being excessively lowered. It can be kept as high as possible.

  To prevent the temperature of the object to be processed 50 in the processing container 1 from exceeding 80 ° C., for example, by setting the temperature of the object to be processed 50 in the processing container 1 to be 60 ° C. or higher and 80 ° C. or lower. is there.

  In addition, it is more preferable that the temperature of the workpiece 50 in the processing container 1 does not exceed 70 ° C. This is because it becomes more certain that the relative humidity of the circulating gas (aging gas) does not decrease too much. To prevent the temperature of the object to be processed 50 in the processing container 1 from exceeding 70 ° C. is to set the temperature of the object to be processed 50 in the processing container 1 to 70 ° C. or around that. For example, 70 ° C. ± 5 ° C., that is, 65 ° C. or more and 75 ° C. or less.

  Here, the control unit 4, for example, based on a signal from the thermometer 14 attached to a portion of the gas return path 32 immediately after exiting the processing container 1, at least one of the outside air supply valve 6 and the exhaust valve 8. By controlling one of the openings, the oxygen concentration of the circulating gas (aging gas) supplied into the processing container 1 is adjusted so that the gas temperature at the gas outlet of the processing container 1 is, for example, 80 ° C. or less. To do. Further, as described above, the control unit 4 adjusts the temperature of the circulating gas (aging gas) supplied into the processing container 1 to 40 ° C., for example, based on the signal from the thermometer 12. Thus, the temperature of the workpiece 50 in the processing container 1 is prevented from exceeding 80 ° C., for example. The temperature and oxygen concentration of the aging gas supplied into the processing container 1 are grasped and adjusted by the control unit 4 based on signals from the thermometer 12 and the oxygen concentration meter 11, respectively.

  Note that, based on a signal from the thermometer 10 attached to the processing container 1, the temperature of the workpiece 50 in the processing container 1 may not exceed 80 ° C. or may not exceed 70 ° C. Good.

  Here, the circulating gas (aging gas) is supplied into the processing container 1 from below the processing container 1 filled with the object to be processed 50, and is oxidized when oxygen in the circulating gas reacts with the object to be processed 50. The inside of the processing vessel 1 is raised while being heated by reaction heat. That is, inside the processing container 1, the temperature of the object to be processed 50 and the temperature of the circulating gas increase toward the upper side (gas outlet) (temperature distribution can be made in the vertical direction). Therefore, as described above, the gas temperature at the gas outlet of the processing container 1 is, for example, 80 ° C. or less based on the signal from the thermometer 14 attached to the part immediately after leaving the processing container 1 in the gas return path 32. Thus, based on the signal from the thermometer 10 attached to the processing container 1, the processing container 50 in the processing container 1 has a temperature higher than 80 ° C., for example. It is possible to more reliably prevent the temperature of the workpiece 50 in 1 from exceeding 80 ° C.

  Since the temperature distribution can be made in the vertical direction in the processing container 1 in this way, the lower the temperature, the lower the reaction rate with oxygen, and hence the less the total reaction with oxygen, and vice versa. The reaction rate with oxygen is high, and therefore the total amount of reaction with oxygen also increases. In this case, 0.2 mg / g / day, which is an index of the reaction rate at the end of the aging operation, is an average value of all samples.

  In addition, based on the temperature of the position near the gas outlet part in the processing container 1, the circulating gas (aging) supplied in the processing container 1 so that the gas temperature at the gas outlet of the processing container 1 becomes 80 ° C. or less, for example. Gas) may be adjusted. That is, in this application, the gas outlet of the processing container 1 includes both the gas outlet part in the processing container 1 and the part close to the processing container 1 in the gas return path 32.

  Further, when the gas temperature at the gas outlet of the processing container 1 is 80 ° C. or lower, the lower limit of the gas temperature is, for example, 60 ° C. That is, the gas temperature at the gas outlet of the processing container 1 is set to, for example, 60 ° C. or more and 80 ° C. or less.

  It is more preferable that the gas temperature at the gas outlet of the processing container 1 is 70 ° C. or around that. For example, the gas temperature at the gas outlet of the processing container 1 is 70 ° C. ± 5 ° C., that is, 65 ° C. or higher and 75 ° C. or lower. By setting the gas temperature at the gas outlet of the processing container 1 to be 70 ° C. or around that, the temperature of the workpiece 50 in the processing container 1 in which the temperature distribution in the vertical direction can be more reliably exceeded 80 ° C. Can not be.

  In the present embodiment, the aging gas supplied into the processing container 1 is adjusted by adjusting the amount of air taken into the system from the gas return path 32 from the processing container 1 to the blower 2 in the gas circulation path 30. ing. Since the gas return path 32 tends to be a negative pressure, it is a part where air is more easily taken into the system than the gas supply path 31. That is, by taking air into the system from the gas return path 32, it becomes easier to adjust the aging gas. Note that the position of air intake into the system is not limited. Air may be taken from any part of the gas circulation path 30.

  In the present embodiment, the temperature and oxygen concentration of the aging gas supplied into the processing container 1 are adjusted, but the temperature adjustment of the aging gas is not essential. When the temperature of the outside air (air) taken in from the outside air supply valve 6 is low, only the oxygen concentration of the aging gas supplied into the processing container 1 may be adjusted.

The cooling capacity of the heat exchanger 3 will be mentioned. The required period of the aging process also depends on the cooling capacity of the heat exchanger 3. The reaction heat of the oxidation reaction in aging is not as great as the heat of complete combustion, for example, about 1643 kcal / kg-O ₂ . 1643 kcal / kg-O ₂ is the amount of heat generated per kg of oxygen taken into the workpiece 50 (coal) from the gas phase by the oxidation reaction (including physical and chemical adsorption) in aging. On the other hand, the amount of oxygen required from the start to the completion of aging is 17 mg-O ₂ / g-coal as described above. From the above, the amount of heat generated by the reaction with oxygen per ton 50 to be processed is 27931 kcal / t-coal (1643 × 17 = 27931).

  Here, this generated amount of heat (heat) is removed by the heat exchanger 3. If the cooling capacity of the heat exchanger 3 is 582 kcal per hour per to-be-processed object 50 and 1 ton, the time required for the aging process is 2 days (27931/582 = 48 hours). On the other hand, if the cooling capacity of the heat exchanger 3 is 1164 kcal, which is doubled per hour per 1 to-be-processed object 50, 1t, the time required for the aging process is shortened to one half (27931 ÷ 1164). = 24 hours).

(Second Embodiment)
A stabilization facility 101 according to a second embodiment of the present invention will be described with reference to FIG. In addition, in the stabilization installation 101 shown in FIG. 4, the same code | symbol is attached | subjected about the same component apparatus as the stabilization installation 100 of 1st Embodiment.

  The stabilization equipment 101 of the second embodiment alternately switches between supplying the aging gas into the processing container 1 from the lower side of the processing container 1 and from the upper side of the processing container 1. It is possible. Note that the supply of the aging gas into the processing container 1 may be performed from the side of the processing container 1 instead of from the upper side and / or the lower side of the processing container 1.

  A gas supply path 31 for supplying the aging gas from the blower 2 to the processing container 1 is branched into a first gas supply path 31 a and a second gas supply path 31 b on the downstream side of the oximeter 11. The first gas supply path 31 a is a path for supplying the aging gas into the processing container 1 from the lower side of the processing container 1. The second gas supply path 31 b is a path for supplying the aging gas into the processing container 1 from above the processing container 1. Inflow side switching valves 15 and 16 are attached to the first gas supply path 31a and the second gas supply path 31b, respectively.

  The gas return path 32 for returning the aging gas from the processing container 1 to the blower 2 is divided into a first gas return path 32a and a second gas return path 32b on the upstream end side, and in front of the thermometer 14. Have joined. The first gas return path 32 a is a path for returning the aging gas that has come out from the upper part in the processing container 1 to the blower 2. The second gas return path 32 b is a path for returning the aging gas that has come out from the lower part in the processing container 1 to the blower 2. Outlet side switching valves 17 and 18 are attached to the first gas return path 32a and the second gas return path 32b, respectively.

  The inflow side switching valves 15 and 16 and the outflow side switching valves 17 and 18 are, for example, automatic valves (for example, electric valves). Although illustration of the electric signal shown with a dotted line is abbreviate | omitted, the control unit 4 also controls opening and closing of the inflow side switching valve 15 * 16 and the outflow side switching valve 17 * 18.

  When the aging gas is supplied into the processing container 1 from the lower side of the processing container 1, the inflow side switching valve 15 and the outflow side switching valve 17 are opened by a signal from the control unit 4, and the inflow side switching valve is opened. 16 and the outflow side switching valve 18 are closed.

  When supplying the aging gas into the processing container 1 from above the processing container 1, the inflow side switching valve 16 and the outflow side switching valve 18 are opened by the signal from the control unit 4, and the inflow side switching valve is opened. 15 and the outflow side switching valve 17 are closed.

  Thereby, the supply of the aging gas into the processing container 1 can be alternately performed between the lower side of the processing container 1 and the upper side of the processing container 1. In the aging process, the supply of the aging gas into the processing container 1 is alternately performed from the lower side (one end side) of the processing container 1 and from the upper side (the other end side) of the processing container 1. By switching to, it is possible to prevent the temperature distribution in the vertical direction from occurring in the workpiece 50 in the processing container 1. It is possible to prevent the reaction rate distribution between the workpiece 50 and oxygen from occurring in the vertical direction. As a result, it is possible to reduce the distribution of the reaction rate of the workpiece 50 (product) after aging with oxygen.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims. .

1: Processing container 2: Blower 3: Heat exchanger 4: Control unit (control means)
6: Outside air supply valve 7: Cooling water amount adjusting valve 8: Exhaust valve 10: Thermometer 11: Oxygen concentration meter 12: Thermometer 13: Flow meter 14: Thermometer 30: Gas circulation path 100: Stabilization equipment

Claims (4)

A coal filling step of filling the processing vessel with coal;
An aging step of partially oxidizing the coal by supplying a gas containing oxygen into the processing vessel filled with coal and bringing the coal and the gas into direct contact with each other;
With
The aging step is a step of partially oxidizing coal while circulating the gas in a gas circulation path connecting a blower and the processing container,
In the aging step, the amount of air taken in from the gas return path from the processing container to the blower in the gas circulation path is adjusted so that the temperature of the coal in the processing container does not exceed 80 ° C. A method for stabilizing coal, comprising adjusting the gas supplied into the processing vessel. A coal filling step of filling the processing vessel with coal;
An aging step of partially oxidizing the coal by supplying a gas containing oxygen into the processing vessel filled with coal and bringing the coal and the gas into direct contact with each other;
With
In the aging step, the oxygen concentration and temperature of the gas supplied into the processing container or the oxygen of the gas supplied into the processing container so that the temperature of coal in the processing container does not exceed 80 ° C. The concentration is adjusted and the gas supply into the processing container is alternately switched from one end side of the processing container to the other end side of the processing container. , Coal stabilization method. A processing vessel in which coal is filled and the coal and the gas containing oxygen are in direct contact with each other to directly oxidize the coal;
A blower for supplying the gas to the processing container;
Control means for adjusting the gas supplied into the processing container so that the temperature of the coal in the processing container does not exceed 80 ° C .;
A gas circulation path for circulating the gas between the blower and the processing container;
With
The control means adjusts the gas supplied into the processing container by adjusting the amount of air taken in from the gas return path from the processing container to the blower in the gas circulation path. , Coal stabilization equipment. A processing vessel in which coal is filled and the coal and the gas containing oxygen are in direct contact with each other to directly oxidize the coal;
A blower for supplying the gas to the processing container;
Control for adjusting the oxygen concentration and temperature of the gas supplied into the processing container or the oxygen concentration of the gas supplied into the processing container so that the temperature of the coal in the processing container does not exceed 80 ° C. Means,
With
The control means further switches between alternately supplying the gas into the processing container from one end side of the processing container and from the other end side of the processing container. Coal stabilization equipment.