Coal dust pressure relief recovery device

Abstract

The present disclosure relates to a pulverized coal pressure relief recovery device, comprising a tank body, a cloth bag filtering device and a blowing device, a feeding port of the tank body is communicated with a pressure relief pipeline of a pulverized coal feeding tank, a discharging port is arranged at the bottom of the tank body and communicated with a pulverized coal storage tank, a vent port is arranged above the feeding port and communicated with a vent pipeline, the lower part of the tank body is conical, which is referred to as a conical part; the cloth bag filtering device is arranged between the feeding port and the vent port and used for blocking the pulverized coal, a gas supply pipeline of the blowing device extends into the conical part from the outside of the conical part in a horizontal direction, a plurality of interval arranged blowing pipelines are communicated with the gas supply pipeline and downwardly extended from the gas supply pipeline, and the blowing device can blow out the pulverized coal in the conical part through the discharging port. The pulverized coal pressure relief recovery device provided by the present disclosure is used for recovering the pulverized coal entrained in the gas discharged from the pressure relief pipeline, preventing the direct venting of the pressure relief pipeline from polluting the air and wasting the pulverized coal.

Description

Technical Field

[0001] This disclosure relates to the field of coal chemical technology, specifically to a pulverized coal depressurization and recovery device. Background Technology

[0002] During the transportation or storage of pulverized coal, the pressure inside the pulverized coal feeder may rise due to temperature changes or other factors. If the excess pressure is not released in time, it may lead to equipment damage or even safety accidents. To ensure the safe operation of the pulverized coal transportation system, pressure relief pipelines are usually installed on the pulverized coal feeder to control the pressure inside the tank within a safe range. In addition, appropriately reducing the pressure inside the tank helps improve the flowability of the pulverized coal, avoids blockage problems, and ensures that the pulverized coal can be smoothly discharged into subsequent processes.

[0003] However, in the actual depressurization process, the substances discharged from the depressurization pipeline not only contain gas but also carry some pulverized coal. If they are directly discharged into the air, they will not only pollute the air but also waste the pulverized coal. Utility Model Content

[0004] In order to solve the problems existing in the prior art, this disclosure provides the following technical solution: A pulverized coal depressurization and recovery device is provided, comprising: The tank body is provided with a feed inlet, a discharge outlet and a vent. The feed inlet is configured to be connected to the pressure relief pipeline of the pulverized coal feed tank and is used to introduce the pulverized coal discharged from the pressure relief pipeline into the tank body. The discharge outlet is located at the bottom of the tank body and is configured to be connected to the pulverized coal storage tank. The vent is located above the feed inlet and is connected to the vent pipeline. The lower part of the tank body is conical and is referred to as the cone. A bag filter device is installed at the top of the tank to block the passage of pulverized coal. The bag filter device is located between the feed inlet and the vent. A purging device includes an air supply pipe and a plurality of spaced-apart air blowing pipes. The air supply pipe is configured to extend horizontally into the cone from the outside of the cone. The air blowing pipes are connected to the air supply pipe and are configured to extend downward from the air supply pipe. The purging device is capable of blowing pulverized coal from the cone through the discharge port.

[0005] In one embodiment of this disclosure, the tank is further connected to a blowing device, which includes a gas storage tank and a nitrogen pipeline. The outlet of the gas storage tank is connected to the nitrogen pipeline. The nitrogen pipeline is configured to extend horizontally into the tank from the outside of the tank and is located above the bag filter device. The nitrogen pipeline is configured to blow nitrogen towards the bag filter device.

[0006] In one embodiment of this disclosure, the nitrogen pipeline is located below the vent.

[0007] In one embodiment of this disclosure, the purging device is configured to be turned on at predetermined time intervals.

[0008] In one embodiment of this disclosure, a first pressure sensor is provided on the tank above the bag filter device, and a second pressure sensor is provided below the bag filter device. The air blowing device is configured to activate when the difference between the first pressure sensor and the second pressure sensor reaches a threshold.

[0009] In one embodiment of this disclosure, the lengths of the plurality of air-blowing pipes are configured to gradually decrease from the inside to the outside in the radial direction of the tank.

[0010] In one embodiment of this disclosure, a discharge valve is provided between the discharge port and the pulverized coal storage tank. The discharge valve is equipped with a steel grid, which is composed of staggered steel bars. The gaps formed between adjacent steel bars allow pulverized coal to pass through.

[0011] In one embodiment of this disclosure, the cone portion is further provided with a heating device, the heating device including a steam coil and an insulation layer, the steam coil being disposed on the outer wall of the cone portion, and the insulation layer covering the outer side of the steam coil.

[0012] In one embodiment of this disclosure, multiple pulverized coal feed tanks are provided, and the multiple pulverized coal feed tanks are configured to be connected to multiple feed ports provided on the tank body through their respective pressure relief pipelines.

[0013] In one embodiment of this disclosure, the plurality of feed inlets are configured to be distributed along the height of the tank and located below the bag filter device.

[0014] The beneficial effects of this disclosure are that the pulverized coal pressure relief and recovery device provided by this disclosure can recover the pulverized coal entrained in the gas discharged from the pressure relief pipeline, preventing the direct venting of the pressure relief pipeline from causing air pollution and wasting pulverized coal. A bag filter device is designed inside the tank, allowing the gas to easily pass through the bag filter device and be discharged from the vent. The pulverized coal is intercepted by the bag filter device and discharged from the discharge port. In order to prevent the intercepted pulverized coal from clogging the discharge port, this disclosure also sets a purging device at the bottom of the pulverized coal pressure relief and recovery device, thereby effectively reducing the probability of clogging at the discharge port.

[0015] Other features and advantages of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments of the present disclosure and, together with their description, serve to explain the principles of the present disclosure.

[0017] Figure 1 This is a schematic diagram of the structure of a pulverized coal depressurization and recovery device provided in one embodiment of the present disclosure.

[0018] Figure 1 The one-to-one correspondence between the component names and the reference numerals in the figures is as follows: 100. Tank body; 101. Inlet; 102. Outlet; 103. Vent; 104. Conical section; 105. Bag filter; 106. Purging device; 1061. Gas supply pipeline; 1062. Gas blowing pipeline; 107. Gas blowing device; 1071. Gas storage tank; 1072. Nitrogen pipeline; 108. First pressure sensor; 109. Second pressure sensor; 110. Discharge valve; 111. Heating device; 112. Observation port; 200. Pulverized coal feeder; 201. Pressure relief pipeline; 300. Pulverized coal storage tank. Detailed Implementation

[0019] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present disclosure.

[0020] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use.

[0021] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0023] In this article, terms such as "up," "down," "front," "back," "left," and "right" are used only to indicate the relative positional relationship between related parts, rather than to define the absolute position of these related parts.

[0024] In this article, "first," "second," etc., are used only to distinguish one another, and not to indicate degree of importance, order, or prerequisite for each other.

[0025] In this document, terms such as “equal” and “same” are not strict mathematical and / or geometric limitations, but also include errors that are understandable to those skilled in the art and permissible in manufacturing or use.

[0026] This disclosure provides a pulverized coal pressure relief and recovery device. For ease of understanding, the specific structure and working principle of the pulverized coal pressure relief and recovery device of this disclosure will be described in detail below with reference to an embodiment.

[0027] During the conveying or storage of pulverized coal, the pressure inside the pulverized coal feeder 200 may rise due to temperature changes or other factors. If the excess pressure is not released in time, it may lead to equipment damage or even a safety accident. To ensure the safe operation of the pulverized coal conveying system, the pulverized coal feeder 200 is usually equipped with a pressure relief pipeline 201 to control the pressure inside the tank within a safe range. In addition, appropriately reducing the pressure inside the tank also helps to improve the flowability of pulverized coal, avoid blockage problems, and ensure that pulverized coal can be smoothly discharged into subsequent processes.

[0028] However, in actual depressurization processes, the substances discharged from the depressurization pipeline not only contain gas but also entrained pulverized coal. If directly released into the air, this would not only pollute the air but also waste the pulverized coal. Therefore, this disclosure provides a pulverized coal depressurization and recovery device for recovering the pulverized coal entrained in the depressurization pipeline.

[0029] refer to Figure 1 This disclosure provides a pulverized coal pressure relief and recovery device, including a tank 100 and a bag filter 105 and a purging device 106 installed inside the tank 100. The tank 100 is provided with an inlet 101 connected to a pressure relief pipeline 201 of a pulverized coal feed tank 200. When the gas pressure in the pulverized coal feed tank 200 is higher than the safe gas pressure, the pressure relief pipeline 201 begins to discharge excess gas into the tank 100. The outlet 102 is located at the bottom of the tank 100 and connected to a pulverized coal storage tank 300. The vent 103 is located above the inlet 101 and connected to a vent pipeline. After being filtered by the pulverized coal pressure relief and recovery device, the excess gas is discharged through the vent pipeline connected to the vent 103, while the entrained pulverized coal can move downwards to the outlet 102 by its own gravity and return to the pulverized coal storage tank 300 for reuse. The lower part of the tank body 100 is conical, referred to as the cone 104. The conical bottom structure guides the pulverized coal to flow more smoothly to the discharge port 102, reducing the resistance to the flow of pulverized coal and improving the conveying efficiency of pulverized coal. An observation port 112 is also provided on the cone 104 to facilitate operators to regularly disassemble, inspect and clean the cone 104.

[0030] Since the vent 103 is located above the feed inlet 101, when the mixed gas carrying pulverized coal in the pressure relief pipeline 201 enters the tank 100, the mixed gas will move upward and pass through the bag filter 105. The bag filter 105 is composed of multiple bags, each of which can meet the requirement of allowing gas molecules to pass through but not allowing pulverized coal to pass through. Thus, the gas in the mixed gas can pass through the bags and be discharged from the tank 100 through the vent 103, while the pulverized coal carried in the mixed gas will be intercepted by the bag filter 105 and move downward to the discharge outlet 102 under the action of gravity. By setting the bag filter 105 at the top of the tank 100 and between the feed inlet 101 and the vent 103, it can be ensured that the mixed gas can pass through the bag filter 105 when it moves, thereby achieving the effect of separating the pulverized coal in the mixed gas.

[0031] Furthermore, the gas supply pipe 1061 of the purging device 106 extends horizontally into the cone 104 from the outside of the cone 104. The gas supply pipe 1061 is connected to nitrogen. Since nitrogen is a very stable inert gas that does not easily react with other substances and is abundant in the atmosphere with relatively low acquisition costs, this application chooses to use nitrogen for purging. After the nitrogen is introduced into the gas supply pipe 1061, it is supplied to multiple spaced gas blowing pipes 1062. Since the gas blowing pipes 1062 are constructed to extend downward from the gas supply pipe 1061, they can directly purge the cone 104, thereby preventing the pulverized coal from caking due to failure to be discharged in time after falling into the cone 104.

[0032] The pulverized coal pressure relief and recovery device provided in this disclosure can recover the pulverized coal entrained in the gas discharged from the pressure relief pipeline 201, preventing the direct venting of the pressure relief pipeline 201 from causing air pollution and wasting pulverized coal. A bag filter device 105 is designed inside the tank 100, allowing the gas to easily pass through the bag filter device 105 and be discharged from the vent 103. The pulverized coal is intercepted by the bag filter device 105 and discharged from the discharge port 102. To prevent the intercepted pulverized coal from clogging the discharge port 102, this disclosure also provides a purging device 106 at the bottom of the pulverized coal pressure relief and recovery device, thereby effectively reducing the probability of clogging of the discharge port 102.

[0033] refer to Figure 1 In one embodiment of this disclosure, the tank 100 is further connected to an air blowing device 107, which includes a gas storage tank 1071 and a nitrogen pipeline 1072. The outlet of the gas storage tank 1071 is connected to the nitrogen pipeline 1072. The nitrogen pipeline 1072 is configured to extend horizontally into the tank 100 from the outside of the tank 100 and is located above the bag filter device 105. The nitrogen pipeline 1072 is configured to blow nitrogen towards the bag filter device 105.

[0034] Since the bag filter 105 is located between the feed inlet 101 and the vent 103, the mixed gas can pass through the bag filter 105 when it moves, allowing the gas in the mixed gas to pass through the bag filter 105 and be discharged from the vent 103. The pulverized coal in the mixed gas cannot pass through the bag and is intercepted by the bag filter 105. Some of the intercepted pulverized coal will adhere to the outside of the bag. If it is not cleaned in time, it will easily clog the bag, thereby affecting the filtration efficiency of the bag filter 105. Therefore, this disclosure also connects an air blowing device 107 to the upper part of the tank 100.

[0035] Specifically, the blowing device 107 is located at the upper part of the tank 100, including a gas storage tank 1071 and a nitrogen pipeline 1072. The gas storage tank 1071 stores nitrogen and can deliver nitrogen through the nitrogen pipeline 1072 to the top of the bag filter device 105, thereby blowing nitrogen towards the bag filter device 105, causing the pulverized coal attached to the filter bag to detach from the filter bag and move downwards. In practical applications, in order to meet the blowing requirements of all filter bags, multiple nitrogen pipelines 1072 can be provided, and each is configured to extend horizontally into the tank 100 from the outside of the tank 100 and be located above the bag filter device 105. Each nitrogen pipeline 1072 is controlled by a solenoid valve, which can effectively prevent the filter bags from clogging.

[0036] refer to Figure 1 In one embodiment of this disclosure, a nitrogen pipeline 1072 is disposed below a vent 103.

[0037] Specifically, since the excess gas in the pulverized coal depressurization and recovery device of this disclosure is discharged to the outside through the vent 103, and the nitrogen pipeline 1072 is configured to blow air downward so that the blown nitrogen acts on the filter bag, placing the nitrogen pipeline 1072 below the vent 103 can ensure that the nitrogen blown out of the nitrogen pipeline 1072 fully acts on the filter bag without causing waste. If the nitrogen pipeline 1072 is placed above the vent 103, some nitrogen may flow out through the vent 103 without acting on the filter bag during the blowing process, thus causing nitrogen waste.

[0038] refer to Figure 1 In one embodiment of this disclosure, the purging device 106 is configured to be turned on at predetermined time intervals.

[0039] Specifically, compared to a continuous purging system, intermittent operation allows for adjustments to the working cycle based on actual needs, reducing unnecessary energy consumption. Furthermore, the predetermined time interval of the purging device 106 can be customized according to the specific requirements of the production process, thus flexibly adapting to different operating conditions. For example, the purging frequency can be increased during high-load periods to handle more pulverized coal, while the number of purging operations can be appropriately reduced during low-load periods to save energy consumption.

[0040] refer to Figure 1 In one embodiment of this disclosure, a first pressure sensor 108 is provided on the tank 100 above the bag filter device 105, and a second pressure sensor 109 is provided below the bag filter device 105. The air blowing device 107 is configured to be turned on when the difference between the first pressure sensor 108 and the second pressure sensor 109 reaches a threshold.

[0041] Specifically, since the bag filter 105 may become clogged during use due to the adhesion of pulverized coal on its outer side, thus affecting its separation efficiency, this disclosure provides a first pressure sensor 108 located above the bag filter 105 and a second pressure sensor 109 located below the bag filter 105 to detect the pressure in the space above the bag filter 105 and to facilitate timely adjustments by the operator. When the bag filter 105 is functioning normally without clogging, the pressure difference between the first pressure sensor 108 and the second pressure sensor 109 remains within the normal threshold range. When the bag filter 105 becomes clogged, the pressure difference exceeds the threshold range. In this case, the operator can manually or via program control activate the air blowing device 107 to purge the bag filter 105, thereby effectively preventing clogging.

[0042] refer to Figure 1 In one embodiment of this disclosure, the lengths of a plurality of air blowing pipes 1062 in the radial direction of the tank 100 are configured to gradually shorten from the inside to the outside.

[0043] Specifically, since the purging device 106 is located in the cone 104 of the pulverized coal depressurization and recovery device, and the geometry of the cone 104 is contracted from the outside to the inside, in order to purify the surface of the cone 104 evenly, the length of the multiple air blowing pipes 1062 is constructed to gradually shorten from the inside to the outside, thereby ensuring that the entire surface of the cone 104 can receive a relatively uniform purging force, effectively preventing the accumulation of pulverized coal at any location and causing caking.

[0044] refer to Figure 1 In one embodiment of this disclosure, a discharge valve 110 is provided between the discharge port 102 and the pulverized coal storage tank 300. The discharge valve 110 is equipped with a steel grid, which is composed of staggered steel bars. The gaps formed between adjacent steel bars allow pulverized coal to pass through.

[0045] Specifically, a discharge valve 110 is installed between the discharge port 102 and the pulverized coal storage tank 300. The steel grating inside the discharge valve 110 can play a role in preventing blockage. It can effectively block large particles, lumps, or other substances that may cause blockage, thereby preventing them from entering the subsequent pipeline and causing blockage. This helps to keep the entire conveying system unobstructed. Moreover, through the gaps between the steel bars, the pulverized coal can be guided to the pulverized coal storage tank 300, reducing the blockage problem caused by local accumulation inside the discharge valve 110.

[0046] refer to Figure 1 In one embodiment of this disclosure, the cone portion 104 is further provided with a heating device 111, which includes a steam coil and an insulation layer. The steam coil is disposed on the outer wall of the cone portion 104, and the insulation layer covers the outer side of the steam coil.

[0047] Specifically, since the pulverized coal is at approximately 100°C when it enters the tank 100, and the tank 100 itself is not equipped with a heating device 111, the pulverized coal may solidify or condense due to the temperature drop after entering the tank 100. The solidified pulverized coal is more likely to accumulate in the cone 104, thereby causing blockage of the discharge port 102. Therefore, this disclosure adds a heating device 111 to the outside of the cone 104 to provide the necessary heat and keep the pulverized coal at a suitable temperature, thereby effectively preventing the pulverized coal from condensing or solidifying and reducing the risk of blockage.

[0048] Furthermore, the heating device 111 includes a steam coil and an insulation layer covering its outer side. Steam at approximately 159°C flows through the steam coil to heat the cone 104. Although the steam coil can provide sufficient heat, unavoidable heat loss occurs, causing the actual temperature reached at the cone 104 to be lower than the steam temperature. To reduce heat loss, this disclosure covers the steam coil with an insulation layer. This ensures that after heating by the steam coil, the temperature of the cone 104 can be stably maintained at approximately 80°C, thereby effectively preventing pulverized coal condensation.

[0049] refer to Figure 1 In one embodiment of this disclosure, multiple pulverized coal feed tanks 200 are provided, and the multiple pulverized coal feed tanks 200 are configured to be connected to multiple feed inlets 101 provided on the tank body 100 through their respective pressure relief pipelines 201.

[0050] Specifically, each of the multiple pulverized coal feeders 200 is equipped with an independent pressure relief pipeline 201. These pipelines not only maintain appropriate working pressure within each feeder 200 but also effectively prevent safety hazards caused by excessive pressure. Since each feeder 200 has its own pressure relief pipeline 201, directly connected to different inlets 101 of the pulverized coal pressure relief and recovery device, the disclosed pulverized coal pressure relief and recovery device can handle high-load demands when multiple feeders 200 need to be depressurized simultaneously, increasing the total feed volume without affecting the device's filtration and recovery effects. Furthermore, operators can flexibly adjust the number of feeders 200 according to actual production needs, maximizing the system's processing capacity while ensuring safety, effectively addressing peak production demands.

[0051] refer to Figure 1 In one embodiment of this disclosure, a plurality of feed inlets 101 are configured to be distributed in the height direction of the tank 100 and located below the bag filter device 105.

[0052] Specifically, setting multiple feed inlets 101 in the height direction can ensure that the pulverized coal introduced into each feed inlet 101 can be evenly distributed into the entire internal space of the tank 100. This helps to avoid the problem of excessive local pressure caused by the concentrated entry of mixed gas, and ensures the smoothness and stability of the mixed gas flow.

[0053] The pulverized coal pressure relief and recovery device provided in this disclosure can recover the pulverized coal entrained in the gas discharged from the pressure relief pipeline 201, preventing the direct venting of the pressure relief pipeline 201 from causing air pollution and wasting pulverized coal. A bag filter device 105 is designed inside the tank 100, allowing the gas to easily pass through the bag filter device 105 and be discharged from the vent 103. The pulverized coal is intercepted by the bag filter device 105 and discharged from the discharge port 102. To prevent the intercepted pulverized coal from clogging the discharge port 102, this disclosure also provides a purging device 106 at the bottom of the pulverized coal pressure relief and recovery device, thereby effectively reducing the probability of clogging of the discharge port 102.

[0054] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein. The scope of this disclosure is defined by the appended claims.

Claims

1. A pulverized coal depressurization and recovery device, characterized in that, include: The tank (100) is provided with an inlet (101), an outlet (102) and a vent (103). The inlet (101) is configured to be connected to the pressure relief pipeline (201) of the pulverized coal feed tank (200) and is used to introduce the pulverized coal discharged from the pressure relief pipeline (201) into the tank (100). The outlet (102) is located at the bottom of the tank (100) and is configured to be connected to the pulverized coal storage tank (300). The vent (103) is located above the inlet (101) and is connected to the vent pipeline. The lower part of the tank (100) is conical and is referred to as the cone (104). A bag filter device (105) is provided at the upper part of the tank (100) to block the passage of pulverized coal. The bag filter device (105) is provided between the feed inlet (101) and the vent (103). A purging device (106) includes an air supply pipe (1061) and a plurality of spaced-apart air blowing pipes (1062). The air supply pipe (1061) is configured to extend horizontally into the cone (104) from the outside of the cone (104). The air blowing pipes (1062) are connected to the air supply pipe (1061) and are configured to extend downward from the air supply pipe (1061). The purging device (106) is capable of blowing the pulverized coal in the cone (104) through the discharge port (102).

2. The pulverized coal depressurization and recovery device as described in claim 1, characterized in that, The tank (100) is also connected to an air blowing device (107), which includes a gas storage tank (1071) and a nitrogen pipeline (1072). The outlet of the gas storage tank (1071) is connected to the nitrogen pipeline (1072). The nitrogen pipeline (1072) is configured to extend horizontally into the tank (100) from the outside of the tank (100) and is located above the bag filter device (105). The nitrogen pipeline (1072) is configured to blow nitrogen towards the bag filter device (105).

3. The pulverized coal depressurization and recovery device as described in claim 2, characterized in that, The nitrogen pipeline (1072) is located below the vent (103).

4. The pulverized coal depressurization and recovery device according to claim 2, characterized in that, The purging device (106) is configured to be turned on at predetermined time intervals.

5. The pulverized coal depressurization and recovery device according to claim 2, characterized in that, A first pressure sensor (108) is provided on the tank (100) above the bag filter device (105), and a second pressure sensor (109) is provided below the bag filter device (105). The air blowing device (107) is configured to turn on when the difference between the first pressure sensor (108) and the second pressure sensor (109) reaches a threshold.

6. The pulverized coal depressurization and recovery device as described in claim 1, characterized in that, In the radial direction of the tank (100), the lengths of the plurality of air blowing pipes (1062) are configured to gradually shorten from the inside to the outside.

7. The pulverized coal depressurization and recovery device as described in claim 1, characterized in that, A discharge valve (110) is provided between the discharge port (102) and the pulverized coal storage tank (300). The discharge valve (110) is equipped with a steel grid inside. The steel grid is composed of staggered steel bars, and the gaps formed between adjacent steel bars allow pulverized coal to pass through.

8. The pulverized coal depressurization and recovery device as described in claim 1, characterized in that, The cone (104) is also provided with a heating device (111), which includes a steam coil and an insulation layer. The steam coil is disposed on the outer wall of the cone (104), and the insulation layer covers the outside of the steam coil.

9. The pulverized coal depressurization and recovery device as described in claim 1, characterized in that, Multiple pulverized coal feed tanks (200) are provided, and the multiple pulverized coal feed tanks (200) are configured to be connected to multiple feed inlets (101) provided on the tank body (100) through their respective pressure relief pipelines (201).

10. The pulverized coal depressurization and recovery device as described in claim 9, characterized in that, The plurality of feed inlets (101) are configured to be distributed in the height direction of the tank (100) and located below the bag filter device (105).

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