Long-term coal storage method based on liquid-gas phase change

Abstract

The embodiment of the present application relates to the technical field of coal storage equipment, and discloses a long-term coal storage method based on liquid-gas phase change. The method comprises the following steps: connecting a liquid storage container containing a cooling medium with a gasifier; gasifying the cooling medium through the gasifier; sending the cooling medium to the bottom of a coal pile through a gas sending pipeline at a first flow rate; sending the cooling medium to the bottom of the coal pile through the gas sending pipeline at a second flow rate greater than the first flow rate; when the amount of the cooling medium released reaches a first preset value, stopping the release of the cooling medium and disconnecting the liquid storage container from the gasifier. Since the gasified cooling medium has a high pressure and a low temperature, the pressure of the cooling medium decreases after escaping through the gas sending hole, thereby further reducing the temperature. Therefore, the cooling medium entering the coal pile absorbs a large amount of heat, thereby achieving the cooling of the coal pile. The temperature of the cooled coal pile is relatively low, and the probability of spontaneous combustion is significantly reduced, thereby achieving the long-term and safe storage of coal.

Description

Technical Field

[0001] This invention relates to the field of coal storage equipment, and in particular to a long-term coal storage method based on liquid-gas phase change. Background Technology

[0002] Coal goes through a cycle from mining to sale, and from purchase to use, during which time it needs to be stored. From mining to sale, large quantities of coal typically need to be stored for extended periods. Similarly, from purchase to use, coal-fired power plants often store large quantities of coal for long periods. Generally, coal is stored in enclosed coal sheds.

[0003] When large quantities of coal are stored in conventional coal storage sheds, the long-term accumulation of coal causes its surface to come into full contact with oxygen in the air. The hydrogen, carbon, and sulfur elements in the coal react with oxygen to produce oxidative compounds such as CO and CH4. The coal surface decomposes and breaks down, releasing heat and forming new surfaces, which then oxidize again, creating a continuous cycle. The released heat causes the internal temperature of the coal pile to gradually rise. As the temperature increases, the oxidation of the coal accelerates, releasing even more heat and combustible matter. When the combustible matter and heat reach a certain level, spontaneous combustion will occur. Generally, without intervention, spontaneous combustion of coal occurs within one to four months of storage.

[0004] To reduce the risk of spontaneous combustion of coal, it is usually necessary to manually monitor and record the internal temperature of the coal pile regularly. For excessively high temperatures, measures need to be taken, such as using water spraying to cool and remove heat, or turning over hot coals to the outside to prevent heat buildup. However, water spraying is a less effective method to prevent spontaneous combustion. Insufficient water spraying may have the opposite effect. For example, sulfur in the coal oxidizes to form sulfur oxides, which then react with water to form sulfuric acid, generating a large amount of heat and accelerating the oxidation process. Water spraying is especially ineffective for coal piles that have already spontaneously combusted. Furthermore, turning over the coal pile is time-consuming and laborious; the above measures do not fundamentally solve the problem. Summary of the Invention

[0005] This invention provides a long-term coal storage method based on liquid-gas phase change, which aims to solve the problem of coal easily generating heat or even spontaneously combusting during storage.

[0006] To solve the above-mentioned technical problems, one technical solution adopted by the present invention is: providing a long-term coal storage method based on liquid-gas phase change, applied to a coal storage device. The coal storage device includes a coal shed, a gasifier, a gas delivery pipe, a filling element, and a vent. The coal shed is located above the coal pile to cover it. The gas delivery pipe is arranged corresponding to the coal pile and is laid in an installation groove set on the ground. The gas delivery pipe is connected to the gasifier and has gas delivery holes. The filling element is located in the installation groove and covers the gas delivery pipe. The filling element has gaps through which the cooling medium can pass. The vent is located in the installation groove and covers the gas delivery pipe. The liquid storage container is connected to the gasifier. The method includes:

[0007] S1: Connect the liquid storage container containing the cooling medium to the vaporizer;

[0008] S2: The cooling medium released from the liquid storage container is vaporized by the vaporizer;

[0009] S3: The cooling medium is delivered to the bottom of the coal pile through the air supply pipe at a first flow rate to dry the air supply pipe and the air supply hole;

[0010] S4: The cooling medium is delivered to the bottom of the coal pile through the gas supply pipe at a second flow rate, wherein the second flow rate is greater than the first flow rate;

[0011] S5: When the amount of cooling medium released reaches the first preset value, stop releasing the cooling medium and disconnect the connection between the liquid storage container and the vaporizer.

[0012] Optionally, after step S5, step S6 is also included:

[0013] S6: When there are multiple gasifiers, connect the liquid storage container to the gasifier corresponding to the next coal pile that needs to be cooled; repeat S2 to S5 until the cooling medium release amount of multiple gasifiers reaches the first preset value.

[0014] Optionally, the coal storage device further includes a support member, which is disposed at the bottom of the mounting groove. The vent cover is placed on the support member, and the support member and the vent cover together form a receiving cavity, in which the gas delivery pipe is received. The support member contacts the gas delivery pipe to support the gas delivery pipe.

[0015] Optionally, there are multiple gas delivery pipes, which are spaced apart; there is one vaporizer, and each gas delivery pipe is connected to the vaporizer.

[0016] Optionally, multiple gas delivery pipes are provided, and the multiple gas delivery pipes are spaced apart. The multiple gas delivery pipes form multiple pipe groups, and each pipe group has at least two gas delivery pipes. Each pipe group is connected to the vaporizer.

[0017] Optionally, the coal storage device further includes a liquid storage container, which is movable and can be detachably connected to the gasifier.

[0018] Optionally, the coal storage device further includes a regulating valve, which is disposed between the liquid storage container and the gas delivery pipeline, and is used to regulate the flow rate of the cooling medium.

[0019] Optionally, the cooling medium is carbon dioxide.

[0020] The beneficial effects of this invention are as follows: Unlike existing technologies, the coal storage device in this invention includes a coal shed, a gasifier, and a gas delivery pipe. The coal shed is positioned above the coal pile to cover it. The gasifier converts the liquid cooling medium into a gaseous state. The gas delivery pipe is positioned corresponding to the coal pile. The gas delivery pipe is connected to the gasifier, so the cooling medium gasified by the gasifier can enter the gas delivery pipe. The gas delivery pipe has a gas delivery hole, through which the cooling medium escapes and enters the coal pile. Because the gasified cooling medium has a high pressure and a low temperature, its pressure decreases after escaping through the gas delivery hole, further reducing its temperature. Therefore, the cooling medium entering the coal pile absorbs a large amount of heat to cool the coal pile. After cooling, the coal pile has a relatively low temperature, significantly reducing the probability of spontaneous combustion and enabling long-term, safe coal storage. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in specific embodiments of the present invention or the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0022] Figure 1 This is a cross-sectional view of a coal storage device according to an embodiment of the present invention;

[0023] Figure 2 This is a cross-sectional view of the gas delivery pipeline of a coal storage device in one embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of a coal storage device in one embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the coal storage device in another embodiment of the present invention;

[0026] Figure 5 This is a partial structural schematic diagram of a coal storage device in another embodiment of the present invention;

[0027] Figure 6 This is a flowchart of a long-term coal storage method based on liquid-gas phase change in one embodiment of the present invention.

[0028] Figure 7 This is a flowchart of a long-term coal storage method based on liquid-gas phase change in one embodiment of the present invention.

[0029] Figure 8 This is a flowchart of a long-term coal storage method based on liquid-gas phase change in one embodiment of the present invention.

[0030] Figure 9 This is a flowchart of a long-term coal storage method based on liquid-gas phase change in one embodiment of the present invention.

[0031] Explanation of reference numerals in the attached figures:

[0032] 100. Coal storage device; 1. Gasifier; 2. Gas supply pipeline; 21. Gas supply hole; 22. Pipeline assembly; 3. Filler; 4. Support; 5. Ventilation hood; 6. Coal shed; 200. Ground; 201. Installation trough; 300. Coal pile; 400. Liquid storage container. Detailed Implementation

[0033] To facilitate understanding of the present invention, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected to" another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this specification are for illustrative purposes only.

[0034] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0035] Please see Figure 1 and Figure 3 The present invention provides a coal storage device 100 for storing a coal pile 300, wherein the coal pile 300 is placed on the ground 200.

[0036] The coal storage device 100 includes a coal shed 6, a gasifier 1, and a gas supply pipe 2. The coal shed 6 is located above the coal pile 300 to cover it. The gasifier 1 is used to convert the liquid cooling medium into a gaseous state; the specific structure of the gasifier 1 can be found in relevant technologies. The gasifier 1 is located on the outside of the coal shed.

[0037] Gas supply pipe 2 is installed corresponding to the coal pile 300. Gas supply pipe 2 is connected to gasifier 1, so the cooling medium vaporized by gasifier 1 can enter the gas supply pipe 2. The portion of gas supply pipe 2 covered by the coal pile 300 is provided with gas supply holes 21. The gaseous cooling medium in gas supply pipe 2 escapes outward through the gas supply holes 21, and then enters the interior of the coal pile 300. Because the vaporized cooling medium has a high pressure and a low temperature, the pressure of the cooling medium decreases after escaping through the gas supply holes 21, thereby further reducing the temperature. Therefore, the gaseous cooling medium entering the interior of the coal pile 300 absorbs a large amount of heat to cool the coal pile 300. After cooling, the temperature of the coal pile 300 is relatively low, and the probability of spontaneous combustion is significantly reduced.

[0038] A coal shed 6 is positioned above the coal pile 300 to cover it. A predetermined distance exists between the top of the coal pile 300 and the coal shed 6, the distance depending on the span of the coal shed 6 and the working height of the equipment within it. The height of the coal shed 6 is between one-third and one-half of its span. Positioning the coal shed 6 above the coal pile 300 prevents coal from being blown away by the wind and polluting the environment, while also reducing coal waste.

[0039] The gaseous cooling medium entering the coal pile 300 is a non-combustible gas with relatively stable chemical properties and does not react chemically with the coal. The specific components of the cooling medium entering the coal pile 300 include, but are not limited to, carbon dioxide, nitrogen, rare gases, or mixed gases. Preferably, the cooling medium is carbon dioxide.

[0040] Please see Figure 2 In some embodiments, the air inlet 21 is located on the lower half of the air supply pipe 2, which can reduce the probability of clogging the air inlet 21 by coal slag, dust, etc. The lower half of the air supply pipe 2 is the area below the horizontal line S of the air supply pipe 2.

[0041] Please see Figure 1 and Figure 5 In some embodiments, an installation groove 201 is provided on the ground 200 below the coal pile 300, and the gas supply pipe 2 is laid in the installation groove 201, which can reduce the probability of the gas supply pipe 2 being damaged.

[0042] The coal storage device 100 also includes a filler 3, which is installed in the installation groove 201 and covers the gas supply pipe 2. The filler 3 has a gap through which the gaseous cooling medium can pass. That is, after the cooling medium in the gas supply pipe 2 escapes through the gas supply hole 21, it enters the coal pile 300 through the above-mentioned gap.

[0043] In this embodiment, the filler 3 is made of coal gangue. The coal gangue filler 3 is loose and porous to form the gap through which the cooling medium passes.

[0044] Please see Figure 5 In some embodiments, the coal storage device 100 also includes a vent 5, which is generally arc-shaped and located in the mounting groove 201. The vent 5 covers the gas supply pipe 2 to prevent the gas supply pipe 2 from being damaged by pressure.

[0045] Please see Figure 5 In some embodiments, the coal storage device 100 further includes a support member 4, which is laid on the bottom of the installation groove 201. A vent hood 5 is placed on the support member 4, and a filler 3 is placed above the vent hood 5. The vent hood 5 and the support member 4 together form a receiving cavity, in which the air supply pipe 2 is received. The support member 4 is in contact with the air supply pipe 2 to support the air supply pipe 2 and prevent bending, deformation, or damage to the air supply pipe 2 due to ground subsidence. The support member 4 has high hardness, and its material is preferably concrete, metal, etc.

[0046] In this embodiment, the vent 5 is a metal mesh cage structure, allowing the gaseous cooling medium to pass through. The material of the filler 3 includes, but is not limited to, coal gangue.

[0047] In summary, an installation groove 201 is provided on the ground 200 of the coal yard, the support 4 is laid on the bottom of the installation groove 201, the vent 5 is covered on the support 4, the vent 5 and the support 4 together form a receiving cavity, the air supply pipe 2 is received in the receiving cavity, and the filler 3 is laid on the top of the vent 5.

[0048] Please see Figure 5 In some embodiments, Figure 5 The X-axis in the figure is horizontal. Along the horizontal direction, neither end of the vent hood 5 extends beyond the two ends of the support member 4. Therefore, the support member 4 can provide stable support for the vent hood 5 to improve the stability of the vent hood 5.

[0049] Please see Figure 3 In some embodiments, multiple gas supply pipes 2 are provided, and the multiple gas supply pipes 2 are arranged at intervals. Correspondingly, one vaporizer 1 is provided, and each gas supply pipe 2 is connected to the vaporizer 1.

[0050] Please see Figure 4In some embodiments, multiple gas supply pipes 2 are provided, spaced apart, and divided into multiple pipe groups 22, each pipe group 22 having at least two gas supply pipes 2. Correspondingly, multiple vaporizers 1 are provided, and the number of vaporizers 1 is equal to the number of pipe groups 22. The vaporizers 1 and pipe groups 22 are arranged in a one-to-one correspondence, and the vaporizers 1 are connected to the corresponding pipe groups 22.

[0051] In some embodiments, multiple gas supply pipes 2 are provided, spaced apart, and divided into multiple pipe groups 22, each pipe group 22 having at least two gas supply pipes 2. Correspondingly, one vaporizer 1 is provided, each pipe group 22 is connected to the vaporizer 1, and a valve (not shown) is provided between the vaporizer 1 and each pipe group 22. The vaporizer 1 controls which pipe group 22 the cooling medium is delivered to through the valve.

[0052] In some embodiments, the pipe group 22 is provided in a one-to-one correspondence with the coal pile 300.

[0053] In some embodiments, a coal pile 300 is provided with multiple pipe groups 22, and the multiple pipe groups 22 are arranged at different locations within the coal pile 300. Figure 4 For example, Figure 4 There are three pipe groups 22 in total, each pipe group 22 has three gas supply pipes 2, and there are three vaporizers 1, with one vaporizer 1 in each pipe group 22. Each vaporizer 1 is connected to each gas supply pipe 2 in the corresponding pipe group 22.

[0054] Please see Figure 1 and Figure 3 The coal storage device 100 also includes a liquid storage container 400. The liquid storage container 400 is used to supply a cooling medium. The gasifier 1 is connected to the liquid storage container 400 to receive the cooling medium supplied by the liquid storage container 400. The liquid storage container 400 can be moved to facilitate the supply of cooling medium to multiple gasifiers 1 in different locations, and also facilitates the filling and transportation of the cooling medium. The liquid storage container 400 includes, but is not limited to, tank trucks for transporting high-pressure liquid cooling medium or storage tanks for storing high-pressure liquid cooling medium. The liquid storage container 400 can be detachably connected to the gasifier 1 to facilitate connection of the liquid storage container 400 to different gasifiers 1.

[0055] The coal storage device 100 also includes a regulating valve (not shown in the figure). The regulating valve is used to regulate the flow rate of the cooling medium. The regulating valve is located between the liquid storage container and the gas delivery pipeline. The regulating valve can be located between the outlet of the liquid storage container and the inlet of the gasifier, or between the outlet of the gasifier and the inlet of the gas delivery pipeline. After connecting the liquid storage container and the gasifier, a small flow rate of cooling medium with a temperature higher than 0°C is first sent into the gas delivery pipeline by adjusting the regulating valve to dry the gas delivery pipeline and the gas delivery orifice. Then, the flow rate of the cooling medium is increased by the regulating valve and transported to the bottom of the coal pile through the gas delivery pipeline.

[0056] Please see Figure 1 In some embodiments, the coal storage device 100 further includes a temperature sensor group and a controller (not shown). The controller is electrically connected to the temperature sensor group and is used to receive temperature values ​​sent by the temperature sensor group and issue an over-temperature alarm.

[0057] The temperature sensor group includes an infrared temperature sensor and / or a plug-in temperature monitor. Figure 1 In the diagram, the X-axis is horizontal and the Y-axis is vertical. The infrared temperature sensor is positioned vertically above the coal pile 300, meaning there is a gap between the sensor and the top of the coal pile. Since the coal pile 300 radiates heat when heated, the infrared temperature sensor above it can detect its temperature. When the controller detects that the temperature value returned by the sensor exceeds a preset temperature threshold, it sends an over-temperature alarm. Based on the alarm information, a liquid storage container is manually connected to the corresponding gasifier for the coal pile, and a cooling medium is delivered to the bottom of the coal pile via a gas supply pipe.

[0058] Since the infrared temperature sensor is located outside the coal pile 300, spontaneous combustion may have already occurred inside the coal pile 300 if the infrared temperature sensor detects that the temperature of the coal pile 300 has not exceeded the threshold. Therefore, in some embodiments, a rod-type temperature monitoring instrument is also installed inside the coal pile 300. The rod-type temperature monitoring instrument is inserted into the coal pile 300 to accurately detect the temperature inside the coal pile 300. Since the area with the highest internal temperature of the coal pile 300 is 1 to 4 meters below the surface, the rod-type temperature monitoring instrument is inserted into the coal pile 300 to a depth of 1 to 4 meters to accurately detect the temperature of the high-temperature area of ​​the coal pile 300. In other words, regardless of... Figure 1 In any direction, the rod-type temperature monitor can be inserted 1 to 4 meters from the surface of the coal pile 300.

[0059] In some embodiments, the cooling medium is carbon dioxide. Carbon dioxide does not react chemically with coal below 1000 degrees Celsius. Introducing low-temperature, high-pressure carbon dioxide into the coal pile 300 not only cools the coal pile 300, but also reduces the contact area between coal and oxygen, thereby slowing down the rate of coal oxidation and preventing the coal from continuing to oxidize and generate heat.

[0060] In some embodiments, the coal shed 6 is an air-supported membrane coal shed, which refers to a coal shed 6 constructed using an air-supported membrane structure. An air-supported membrane structure is a building structure system that uses a special architectural membrane material as its outer shell and is equipped with a set of intelligent electromechanical equipment to provide positive air pressure inside the air-supported membrane structure to support the main body of the building. Air-supported membrane coal sheds are typically beam-free and column-free, with a simple structure, light weight, and are easy to install and dismantle.

[0061] The methods used in the coal storage device 100 include, but are not limited to:

[0062] Method 1: Periodically connect the gasifier 1 and the storage container 400, and introduce the cooling medium into the gasifier 1. This transforms the cooling medium into a low-temperature, high-pressure gaseous cooling medium, which is then transported to the coal pile 300 through the gas supply pipe 2 to cool the coal pile 300. The cooling medium remaining in the coal pile 300 reduces the contact area between the coal and oxygen, preventing further oxidation of the coal. When a certain amount of cooling medium has been introduced into the coal pile 300, stop releasing the cooling medium and disconnect the connection between the storage container 400 and the gasifier 1. Introduce a certain amount of cooling medium into the coal pile 300 periodically. The gasification interval can be once a week or once a month, and the interval and volume depend on the size of the coal pile 300 and / or the type of coal.

[0063] Method 2: When multiple pipe groups 22 and multiple gasifiers 1 are present, the liquid storage container 400 and each gasifier 1 are connected sequentially to cool different areas of the coal pile 300. The gasifier 1 outputs a low-temperature, high-pressure gaseous cooling medium, which is transported to the coal pile 300 through the gas supply pipe 2 to cool the coal pile 300. The cooling medium remaining in the coal pile 300 reduces the contact area between the coal and oxygen, preventing further oxidation of the coal. When a certain amount of cooling medium is introduced into the coal pile 300, the release of the cooling medium is stopped, and the connection between the liquid storage container 400 and the gasifier 1 is disconnected. A certain amount of cooling medium is introduced into the coal pile 300 at regular intervals; the interval can be one week or one month, and the interval and volume depend on the size of the coal pile 300 and / or the type of coal.

[0064] Method 3: When multiple pipe groups 22 and multiple gasifiers 1 are available, the liquid storage container 400 can be connected to the gasifier 1 corresponding to the coal pile 300 that needs cooling, according to actual needs, including but not limited to interval time or temperature of the coal pile 300 monitored by the temperature sensor group, to achieve cooling at various locations of each coal pile 300. The gasifier 1 outputs a low-temperature, high-pressure gaseous cooling medium, which is transported to the coal pile 300 through the gas supply pipe 2 to cool the coal pile 300. The cooling medium remaining in the coal pile 300 reduces the contact area between the coal and oxygen, preventing further oxidation of the coal. When the amount of cooling medium introduced into the coal pile 300 reaches a certain level, the release of the cooling medium is stopped, and the connection between the liquid storage container 400 and the gasifier 1 is disconnected.

[0065] Method 4: When using a temperature sensor array and controller, even if the predetermined ventilation time interval has not been reached, if the controller detects that the temperature value returned by the temperature sensor is higher than the preset temperature threshold, the controller sends an over-temperature alarm. Based on the over-temperature alarm information, the liquid storage container is manually connected to the gasifier corresponding to the coal pile, and the cooling medium is transported to the bottom of the coal pile through the gas supply pipe. The gasifier 1 outputs a low-temperature, high-pressure gaseous cooling medium, which is transported into the coal pile 300 through the gas supply pipe 2 to cool the coal pile 300. The cooling medium remaining in the coal pile 300 reduces the contact area between the coal and oxygen, preventing further oxidation of the coal. When a certain amount of cooling medium is introduced into the coal pile 300, the release of the cooling medium is stopped, and the connection between the liquid storage container 400 and the gasifier 1 is disconnected.

[0066] In summary, the coal storage device 100 includes a coal shed 6, a gasifier 1, and a gas delivery pipe 2. The coal shed 6 is located above the coal pile 300 to cover it. The gasifier 1 is used to convert the liquid cooling medium into a gaseous cooling medium. The gasifier 1 is located outside the coal shed 6, spaced apart from the coal pile 300. The gas delivery pipe 2 is located corresponding to the coal pile 300. The gas delivery pipe 2 is connected to the gasifier 1, so the cooling medium gasified by the gasifier 1 can enter the gas delivery pipe 2. The gas delivery pipe 2 is provided with a gas delivery hole 21, through which the gaseous cooling medium in the gas delivery pipe 2 escapes outward, and the escaped cooling medium enters the interior of the coal pile 300. Because the gasified cooling medium has a high pressure and a low temperature, the pressure of the cooling medium decreases after escaping through the gas delivery hole, thereby further reducing the temperature. Therefore, it absorbs a large amount of heat when it enters the interior of the coal pile 300, thus cooling the coal pile 300. After cooling, the temperature of the coal pile is relatively low, significantly reducing the probability of spontaneous combustion.

[0067] Please see Figure 6 and combined Figures 1 to 5 The present invention also provides a long-term coal storage method based on liquid-gas phase change, comprising the following steps:

[0068] S1: Connect the liquid storage container 400 containing the cooling medium to the vaporizer 1;

[0069] The liquid storage container 400 and the vaporizer 1 can be connected by a pipe, preferably a flexible pipe.

[0070] S2: The cooling medium released from the liquid storage container 400 is vaporized by the gasifier 1 and then transported to the bottom of the coal pile 300 through the gas delivery pipe 2;

[0071] The cooling medium released from the liquid storage container 400 first enters the gasifier 1 and becomes gaseous. The gaseous cooling medium has a low temperature and a certain pressure. The gaseous cooling medium enters the coal pile 300 and absorbs a large amount of heat inside the coal pile 300 to cool the coal pile 300.

[0072] S3: When the amount of cooling medium released reaches the first preset value, stop releasing the cooling medium and disconnect the connection between the liquid storage container 400 and the vaporizer 1;

[0073] When the amount of cooling medium introduced reaches a certain value, the temperature inside the coal pile 300 will decrease. At this point, the release of the cooling medium will stop, and the connection between the liquid storage container 400 and the gasifier 1 will be disconnected to conserve the amount of cooling medium used. The temperature inside the coal pile 300 can be obtained using a rod-type temperature monitoring instrument. The first preset value is based on the temperature inside the coal pile 300 decreasing to a safe temperature.

[0074] Please see Figure 7 In some embodiments, step 2 includes:

[0075] S21: First, the cooling medium is transported to the bottom of the coal pile through the air supply pipe at a first flow rate to dry the air supply pipe and the air supply hole;

[0076] S22: The cooling medium is then transported to the bottom of the coal pile through the gas supply pipe at a second flow rate, wherein the second flow rate is greater than the first flow rate.

[0077] After connecting the liquid storage container 400 to the gasifier 1, the first flow rate of the cooling medium with a temperature higher than 0°C is first sent into the gas supply pipe 2 by adjusting the regulating valve to dry the gas supply pipe 2 and the gas supply hole 21. Then, the flow rate of the cooling medium is increased by adjusting the regulating valve and transported to the bottom of the coal pile 300 through the gas supply pipe 2.

[0078] Please see Figure 8 In some embodiments, after steps S1-S3 described above, the following step is further included:

[0079] S4: When there are multiple gasifiers, connect the liquid storage container to the gasifier corresponding to the next coal pile that needs to be cooled; repeat S2 and S3 until the cooling medium release of multiple gasifiers reaches the first preset value.

[0080] When multiple gasifiers 1 exist, the liquid storage container 400 can be connected to the gasifier 1 corresponding to the coal pile that needs to be cooled, according to actual needs, including but not limited to the interval time or the coal pile temperature monitored by the temperature sensor group, and steps S2 and S3 can be repeated to achieve cooling at each position of each coal pile 300. It is not necessary to connect it to each gasifier 1, which can improve the cooling effect, reduce the cooling time, and save the amount of cooling medium used.

[0081] Please see Figure 9 In some embodiments, after steps S1-S4 described above, the following step is further included:

[0082] S5: After the first preset time interval, repeat all the above steps.

[0083] Repeat the above steps at intervals to maintain a low temperature within the coal pile 300 for an extended period. The ventilation interval depends on the size of the coal pile 300 and / or the type of coal.

[0084] The amount of cooling medium in the storage container is usually equal to or slightly greater than the first preset value multiplied by the number of gasifiers, so that the amount of cooling medium in the storage container is just enough to meet the cooling requirements of the coal pile each time.

[0085] Alternatively, a temperature sensor array can be used to monitor the temperature inside the coal pile. When the temperature sensor detects that the temperature inside the coal pile exceeds a preset temperature threshold, steps S1-S4 are initiated.

[0086] It should be noted that while the preferred embodiments of the present invention are given in the specification and accompanying drawings, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are not intended to impose additional limitations on the content of the present invention; their purpose is to provide a more thorough and comprehensive understanding of the disclosure of the present invention. Furthermore, the above-described technical features can be combined with each other to form various embodiments not listed above, all of which are considered to be within the scope of the present invention specification. Moreover, those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A long-term coal storage method based on liquid-gas phase change, characterized in that, An application is made in a coal storage device, the coal storage device including a coal shed, a gasifier, an air supply pipe, a filler, and a vent. The coal shed is positioned above the coal pile to cover it. The air supply pipe is positioned corresponding to the coal pile and is laid in an installation groove on the ground. The air supply pipe is connected to the gasifier and has an air supply hole. Gaseous cooling medium in the air supply pipe escapes through the air supply hole and enters the interior of the coal pile. The filler is positioned in the installation groove and covers the air supply pipe. The filler has gaps through which the cooling medium can pass. The vent is located in the installation groove and covers the air supply pipe. The gasifier is used to connect to a liquid storage container. The method includes: S1: Connect the liquid storage container containing the cooling medium to the vaporizer; S2: The cooling medium released from the liquid storage container is vaporized by the vaporizer; S3: The cooling medium is delivered to the bottom of the coal pile through the air supply pipe at a first flow rate to dry the air supply pipe and the air supply hole; S4: The cooling medium is delivered to the bottom of the coal pile through the gas supply pipe at a second flow rate, wherein the second flow rate is greater than the first flow rate; S5: When the amount of cooling medium released reaches the first preset value, stop releasing the cooling medium and disconnect the connection between the liquid storage container and the vaporizer.

2. The long-term coal storage method based on liquid-gas phase change according to claim 1, characterized in that, Following step S5, the following step is also included: S6: When there are multiple gasifiers, connect the liquid storage container to the gasifier corresponding to the next coal pile that needs to be cooled; repeat S2 to S5 until the cooling medium release amount of multiple gasifiers reaches the first preset value.

3. The long-term coal storage method based on liquid-gas phase change according to claim 1, characterized in that, The coal storage device also includes a support member, which is disposed at the bottom of the mounting groove. The vent cover is placed on the support member, and the support member and the vent cover together form a receiving cavity. The gas delivery pipe is received in the receiving cavity. The support member is in contact with the gas delivery pipe to support the gas delivery pipe.

4. The long-term coal storage method based on liquid-gas phase change according to claim 1, characterized in that, The gas supply pipes are provided in multiple locations, and the multiple gas supply pipes are arranged at intervals; there is one vaporizer, and each gas supply pipe is connected to the vaporizer.

5. The long-term coal storage method based on liquid-gas phase change according to claim 1, characterized in that, The gas supply pipes are provided in multiple ways, and the multiple gas supply pipes are arranged at intervals. The multiple gas supply pipes form multiple pipe groups, and each pipe group has at least two gas supply pipes. Each pipe group is connected to the vaporizer.

6. The long-term coal storage method based on liquid-gas phase change according to any one of claims 1-5, characterized in that, The coal storage device also includes a liquid storage container, which is movable and can be detachably connected to the gasifier.

7. The long-term coal storage method based on liquid-gas phase change according to claim 6, characterized in that, The coal storage device also includes a regulating valve, which is disposed between the liquid storage container and the gas delivery pipeline, and is used to regulate the flow rate of the cooling medium.

8. The long-term coal storage method based on liquid-gas phase change according to any one of claims 1-5, characterized in that, The cooling medium is carbon dioxide.

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