Device for preventing spontaneous combustion of coal in coal storage bunker

Abstract

The utility model belongs to the technical field of coal flame retardance, and relates to a device for preventing spontaneous combustion of coal in a coal storage bunker. One end of the conveying assembly communicates with the third-section steam outlet, and the other end communicates with the inner cavity of the coal storage bunker; wherein the third-section steam outlet refers to a third-section steam extraction outlet of the steam turbine; the third-section steam of the steam turbine is conveyed to the inner cavity of the coal storage bunker through the conveying assembly, original air in the inner cavity of the coal storage bunker is discharged through the space occupation effect of the third-section steam, positive pressure mainly based on the third-section steam is formed in the inner cavity of the coal storage bunker, and high-temperature smoke in the inner cavity of the coal storage bunker is prevented from being gathered; meanwhile, external air cannot enter the inner cavity of the coal storage bunker, so that spontaneous combustion of coal in the coal storage bunker is prevented, the third-section steam of the steam turbine is used as gas for preventing spontaneous combustion of coal in the coal storage bunker, secondary utilization of the third-section steam is achieved, and cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of coal flame retardancy, and particularly relates to a device for preventing coal spontaneous combustion in a coal storage bin. Background Art

[0002] Thermal power plants need to store a large amount of coal to ensure normal production. However, after long-term accumulation, coal undergoes continuous oxidation in the coal bin, resulting in heat accumulation, continuous temperature rise of the coal, and ultimately leading to coal spontaneous combustion. Coal spontaneous combustion not only causes certain economic losses but also easily causes fires.

[0003] In the prior art, there has been some research on methods for preventing coal spontaneous combustion. Referring to the patent document with the application number 202320874226.9, it discloses a silo body and a nitrogen supply pipe. A plurality of layers of steam inlet holes and a plurality of layers of temperature probes are arranged at fixed distances in the height direction of the silo body in a staggered manner. The steam inlet holes are all connected to the nitrogen supply pipe, and an electric control valve and a flow meter are also arranged on the nitrogen supply pipe. It further includes a mesh pipe installed inside the silo body and connected to each layer of the steam inlet holes, and a plurality of steam outlet holes are also opened on the mesh pipe. By connecting the silo body to the nitrogen supply pipe and injecting nitrogen into the silo body, the temperature of the coal is reduced to prevent coal spontaneous combustion.

[0004] It can be seen from this that by injecting nitrogen into the coal storage bin, the temperature of the coal in the coal storage bin can be reduced and coal spontaneous combustion can be prevented. However, nitrogen is expensive, and as a gas for preventing coal spontaneous combustion in the coal storage bin, the cost is relatively high. Summary of the Utility Model

[0005] In order to solve the technical problem in the background art that nitrogen is expensive and the cost of using nitrogen as a gas for preventing coal spontaneous combustion in the coal storage bin is relatively high, the utility model provides a device for preventing coal spontaneous combustion in a coal storage bin.

[0006] The device for preventing coal spontaneous combustion in the coal storage bin of the utility model transports the third-stage steam of the steam turbine to the inner cavity of the coal storage bin through a conveying assembly. Through the space occupation effect of the third-stage steam, the original air in the inner cavity of the coal storage bin is discharged, and a positive pressure mainly composed of the third-stage steam is formed in the inner cavity of the coal storage bin, preventing the aggregation of high-temperature flue gas in the inner cavity of the coal storage bin. At the same time, it prevents external air from entering the inner cavity of the coal storage bin, thereby preventing coal spontaneous combustion in the coal storage bin. The utility model uses the third-stage steam of the steam turbine as a gas for preventing coal spontaneous combustion in the coal storage bin, realizing the secondary utilization of the third-stage steam, and the cost is relatively low.

[0007] To solve the above technical problems, the utility model provides the following technical solutions:

[0008] A device for preventing spontaneous combustion of coal in a coal storage bin, comprising a conveying assembly; one end of the conveying assembly is communicated with the third-stage steam outlet, and the other end is communicated with the inner cavity of the coal storage bin. By introducing the third-stage steam into the inner cavity of the coal storage bin, a positive pressure is formed in the inner cavity of the coal storage bin; wherein, the third-stage steam outlet refers to the outlet of the third-stage extraction steam of the steam turbine.

[0009] In a specific feasible embodiment, the coal storage bin is of a closed structure, and the wall of the coal storage bin is provided with a steam inlet hole and a steam outlet hole; both the steam inlet hole and the steam outlet hole penetrate through the wall of the coal storage bin, and the steam inlet hole and the steam outlet hole are arranged oppositely. The steam inlet hole is communicated with the conveying assembly, and the steam outlet hole is used for discharging the redundant steam in the inner cavity of the coal storage bin.

[0010] In a specific feasible embodiment, the coal storage bin is divided into multiple steam-permeable layers along the height direction, and a steam inlet hole and a steam outlet hole are arranged at the corresponding position of each steam-permeable layer. The steam inlet holes and the steam outlet holes on each steam-permeable layer are oppositely arranged on the wall of the coal storage bin; the steam inlet holes on each steam-permeable layer are communicated with the conveying assembly, and the steam outlet holes on each steam-permeable layer are used for discharging the redundant steam in the inner cavity of the coal storage bin.

[0011] In a specific feasible embodiment, the height range from the steam inlet hole on the steam-permeable layer closest to the bottom of the coal storage bin to the bottom of the coal storage bin is 2.5 - 3 meters.

[0012] In a specific feasible embodiment, the height range from the steam inlet hole on the steam-permeable layer closest to the top of the coal storage bin to the top of the coal storage bin is 5 - 6 meters.

[0013] In a specific feasible embodiment, the spacing range between the steam inlet holes on two adjacent steam-permeable layers is 1.5 - 2 meters.

[0014] In a specific feasible embodiment, the conveying assembly includes a main steam supply pipeline and a plurality of auxiliary steam supply pipelines. The number of the auxiliary steam supply pipelines is the same as the number of the steam-permeable layers, and each steam-permeable layer corresponds to an auxiliary steam supply pipeline; the main steam supply pipeline is communicated with the third-stage steam outlet; one end of each auxiliary steam supply pipeline is communicated with the main steam supply pipeline, and the other end is communicated with the steam inlet hole of the corresponding steam-permeable layer.

[0015] In a specific feasible embodiment, a first regulating valve is installed on the main steam supply pipeline.

[0016] In a specific feasible embodiment, a second regulating valve is installed on the auxiliary steam supply pipeline.

[0017] In summary, the beneficial technical effects of the present utility model include the following:

[0018] 1. The device of the present utility model for preventing spontaneous combustion of coal in a coal storage bunker conveys the third-stage steam of a steam turbine to the inner cavity of the coal storage bunker through a conveying assembly. Through the space occupation effect of the third-stage steam, the original air in the inner cavity of the coal storage bunker is discharged, and a positive pressure mainly composed of the third-stage steam is formed in the inner cavity of the coal storage bunker, preventing the accumulation of high-temperature flue gas in the inner cavity of the coal storage bunker. At the same time, it makes the outside air unable to enter the inner cavity of the coal storage bunker, thereby preventing the spontaneous combustion of coal in the coal storage bunker. The present utility model uses the third-stage steam of the steam turbine as the gas for preventing the spontaneous combustion of coal in the coal storage bunker, realizing the secondary utilization of the third-stage steam with relatively low cost.

[0019] 2. The device of the present utility model for preventing spontaneous combustion of coal in a coal storage bunker installs a first valve on the main steam supply pipeline and second valves on multiple auxiliary steam supply pipelines. Through different combinations of the first valve and the second valves, operators can selectively introduce the third-stage steam into one or all of the steam-passing layers according to the actual situation to prevent the combustion of coal in one or all of the steam-passing layers. Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the overall structure of the device of the present utility model for preventing spontaneous combustion of coal in a coal storage bunker.

[0021] Figure 2 It is a schematic diagram of the structure of Embodiment 9 of the device of the present utility model for preventing spontaneous combustion of coal in a coal storage bunker.

[0022] Description of the Reference Numerals: 1, main steam supply pipeline; 11, first regulating valve; 2, auxiliary steam supply pipeline; 21, second regulating valve; 3, third-stage steam outlet; 4, coal storage bunker; 41, steam inlet hole; 42, steam outlet hole; 43, steam-passing layer; 5, branch pipeline. Detailed Embodiments

[0023] The technical solution of the present utility model will be further explained below in conjunction with the drawings and embodiments, but the present utility model is not limited to the following described embodiments.

[0024] Refer to Figure 1 , a device for preventing spontaneous combustion of coal in a coal storage bunker, comprising: a conveying assembly. One end of the conveying assembly is communicated with the third-stage steam outlet 3, and the other end is communicated with the inner cavity of the coal storage bunker 4. By introducing the third-stage steam into the inner cavity of the coal storage bunker 4, a positive pressure is formed in the inner cavity of the coal storage bunker 4; wherein, the third-stage steam outlet 3 refers to the outlet of the third-stage extraction steam of the steam turbine. The coal storage bunker 4 is provided with a coal gate, and the coal in the coal storage bunker 4 is conveyed to the coal feeder through the opening of the coal gate.

[0025] Embodiment 1:

[0026] Refer to Figure 1, The device in this embodiment is used to prevent coal spontaneous combustion in the coal storage bin. The coal storage bin 4 is a closed structure, and the bin wall of the coal storage bin 4 is provided with a steam inlet hole 41 and a steam outlet hole 42. Both the steam inlet hole 41 and the steam outlet hole 42 penetrate through the bin wall of the coal storage bin 4, and the steam inlet hole 41 and the steam outlet hole 42 are arranged opposite to each other. The steam inlet hole 41 is communicated with the conveying assembly, and the steam outlet hole 42 is used to discharge the excess steam in the inner cavity of the coal storage bin 4.

[0027] Specifically, the third-stage steam is transported to the steam inlet hole 41 through the conveying assembly. The third-stage steam enters the inner cavity of the coal storage bin 4 through the steam inlet hole 41, forms a positive pressure mainly composed of the third-stage steam in the inner cavity of the coal storage bin 4. Through the space occupation effect of the third-stage steam, the original air in the inner cavity of the coal storage bin 4 and the excess third-stage steam are discharged from the steam outlet hole 42, preventing the accumulation of high-temperature flue gas in the inner cavity of the coal storage bin 4, and at the same time preventing the outside air from entering the inner cavity of the coal storage bin 4, thereby preventing the spontaneous combustion of coal in the coal storage bin 4.

[0028] Embodiment 2:

[0029] Refer to Figure 1 , The device in this embodiment is used to prevent coal spontaneous combustion in the coal storage bin. On the basis of Embodiment 1, the coal storage bin 4 is divided into multiple steam-permeable layers 43 along the height direction. The steam inlet hole 41 and the steam outlet hole 42 are arranged at the corresponding positions of each steam-permeable layer 43, and the steam inlet hole 41 and the steam outlet hole 42 on each steam-permeable layer 43 are arranged opposite to each other on the bin wall of the coal storage bin 4; the steam inlet hole 41 on each steam-permeable layer 43 is communicated with the conveying assembly, and the steam outlet hole 42 on each steam-permeable layer 43 is used to discharge the excess steam in the inner cavity of the coal storage bin 4.

[0030] Specifically, the steam-permeable layer 43 can be set to two layers, can be set to three layers, or can be set to four layers. The specific number of layers of the steam-permeable layer 43 can be set according to the height of the coal storage bin 4. In this embodiment, the steam-permeable layer 43 is set to three layers.

[0031] Embodiment 3:

[0032] Refer to Figure 1 , The device in this embodiment is used to prevent coal spontaneous combustion in the coal storage bin. On the basis of Embodiment 2, the height range of the steam inlet hole 41 on the steam-permeable layer 43 closest to the bottom of the coal storage bin 4 from the bottom of the coal storage bin 4 is 2.5 to 3 meters.

[0033] In this embodiment, the height of the steam inlet hole 41 on the steam-permeable layer 43 closest to the bottom of the coal storage bin 4 from the bottom of the coal storage bin 4 can be 2.5 meters, can be 2.8 meters, or can be 3 meters; setting an appropriate height to ensure that the third-stage steam fully and evenly penetrates into the steam-permeable layer 43 closest to the bottom of the coal storage bin 4 to achieve the best anti-spontaneous combustion effect, and such setting methods are all acceptable.

[0034] Embodiment 4:

[0035] Refer to Figure 1 , for the device for preventing spontaneous combustion of coal in the coal storage bin in this embodiment, on the basis of Embodiment 3, the height range from the steam inlet hole 41 on the steam permeable layer 43 closest to the top of the coal storage bin 4 to the top of the coal storage bin 4 is 5 to 6 meters.

[0036] In this embodiment, the height from the steam inlet hole 41 on the steam permeable layer 43 closest to the top of the coal storage bin 4 to the top of the coal storage bin 4 can be 5 meters, can be 5.5 meters, or can be 6 meters; setting an appropriate height to ensure that the third-stage steam fully and evenly penetrates into the steam permeable layer 43 closest to the top of the coal storage bin 4 to achieve the best anti-spontaneous combustion effect, and such setting methods are all acceptable.

[0037] Embodiment 5:

[0038] Refer to Figure 1 , for the device for preventing spontaneous combustion of coal in the coal storage bin in this embodiment, on the basis of Embodiment 4, the spacing range between the steam inlet holes 41 on two adjacent steam permeable layers 43 is 1.5 to 2 meters.

[0039] In this embodiment, the spacing between the steam inlet holes 41 on two adjacent steam permeable layers 43 can be 1.5 meters, can be 1.8 meters, or can be 2 meters; setting an appropriate spacing so that the third-stage steam fully covers and penetrates into each steam permeable layer 43 to achieve the best anti-spontaneous combustion effect, and such setting methods are all acceptable.

[0040] Embodiment 6:

[0041] Refer to Figure 1 , for the device for preventing spontaneous combustion of coal in the coal storage bin in this embodiment, on the basis of Embodiment 2, the conveying assembly includes a main steam supply pipe 1 and a plurality of auxiliary steam supply pipes 2. The number of the auxiliary steam supply pipes 2 is the same as the number of the steam permeable layers 43. In this embodiment, three auxiliary steam supply pipes 2 are provided, and each steam permeable layer 43 corresponds to one auxiliary steam supply pipe 2. The main steam supply pipe 1 is communicated with the third-stage steam outlet 3; one end of each auxiliary steam supply pipe 2 is communicated with the main steam supply pipe 1, and the other end is communicated with the steam inlet hole 41 of the corresponding steam permeable layer 43.

[0042] Embodiment 7:

[0043] Refer to Figure 1 , for the device for preventing spontaneous combustion of coal in the coal storage bin in this embodiment, on the basis of Embodiment 6, a first regulating valve 11 is installed on the main steam supply pipe 1. By opening and closing the first regulating valve 11, the flow of the third-stage steam in the main steam supply pipe 1 is adjusted.

[0044] Embodiment 8:

[0045] Refer to Figure 1, the device for preventing coal spontaneous combustion in the coal storage bin, on the basis of Embodiment 7, a second regulating valve 21 is installed on each auxiliary steam supply pipe 2. By opening and closing the second regulating valve 21, the flow of the third-stage steam in the auxiliary steam supply pipe 2 is controlled.

[0046] Embodiment 9:

[0047] Referring to Figure 1 and Figure 2 , the device for preventing coal spontaneous combustion in the coal storage bin, on the basis of Embodiment 8, there are two coal storage bins 4 arranged side by side. The structures of the two coal storage bins 4 are the same, and the conveying assembly further includes a branch pipe 5. Specifically, the branch pipe 5 is communicated with the main steam supply pipe 1; there are also three auxiliary steam supply pipes 2 provided on the coal storage bin 4 far from the main steam supply pipe 1. Each steam passage layer 43 corresponds to one auxiliary steam supply pipe 2. One end of each auxiliary steam supply pipe 2 is communicated with the branch pipe 5, and the other end is communicated with the steam inlet hole 41 of the corresponding steam passage layer 43. Connecting the auxiliary steam supply pipes 2 on the two coal storage bins 4 through the branch pipe 5 is convenient for preventing coal spontaneous combustion in the two coal storage bins 4 at the same time, and improving the working efficiency of the device for preventing coal spontaneous combustion in the coal storage bin.

[0048] The working principle of the device for preventing coal spontaneous combustion in the coal storage bin of the present utility model is as follows: The operator opens the first valve and all second valves or opens the first valve and any one of the second valves to introduce the third-stage steam into all steam passage layers 43 or any one steam passage layer 43. The third-stage steam fills the corresponding steam passage layer 43. Through the space occupation effect of the third-stage steam, the original air and the excess third-stage steam in the steam passage layer 43 are discharged from the corresponding steam outlet holes 42, avoiding the accumulation of high-temperature flue gas in the steam passage layer 43 and the entry of external air into the corresponding steam passage layer 43, thereby preventing coal spontaneous combustion in the coal storage bin 4.

[0049] When fine water droplets appear on the surface of the coal storage bin 4 or a large amount of smoke appears around the coal storage bin 4, the coal in the coal storage bin 4 is about to spontaneously combust or has already spontaneously combusted. At this time, the operator introduces the third-stage steam into the inner cavity of the coal storage bin 4 until the water droplets on the surface of the coal storage bin 4 or the smoke around the coal storage bin 4 disappear, and then stops introducing the third-stage steam to avoid the combustion of the coal about to spontaneously combust or extinguish the coal that has already spontaneously combusted.

[0050] The above are all preferred embodiments of the present utility model. The protection scope of the present utility model is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of the present utility model should be covered within the protection scope of the present utility model.

Claims

1. A device for preventing spontaneous combustion of coal in a coal storage bunker, characterized in that: including a conveying assembly; One end of the conveying assembly is in communication with the third-stage steam outlet (3), and the other end is in communication with the inner cavity of the coal storage bin (4). By introducing the third-stage steam into the inner cavity of the coal storage bin (4), a positive pressure is formed in the inner cavity of the coal storage bin (4); The third stage steam outlet (3) refers to the outlet of the third stage steam extraction of the steam turbine.

2. The device for preventing spontaneous combustion of coal in a coal storage bin according to claim 1, characterized in that: The coal storage bin (4) is a closed structure, and a steam inlet hole (41) and a steam outlet hole (42) are provided on the wall of the coal storage bin (4); The steam inlet hole (41) and the steam outlet hole (42) are both arranged through the wall of the coal storage bin, and the steam inlet hole (41) and the steam outlet hole (42) are arranged opposite to each other. The steam inlet hole (41) is connected to the conveying component, and the steam outlet hole (42) is used to discharge excess steam in the inner cavity of the coal storage bin (4).

3. The device for preventing spontaneous combustion of coal in a coal storage bin according to claim 2, characterized in that: The coal storage bin (4) is divided into multiple steam-permeable layers (43) along the height direction, each steam-permeable layer (43) is provided with a steam inlet hole (41) and a steam outlet hole (42) at a corresponding position, and the steam inlet hole (41) and the steam outlet hole (42) on each steam-permeable layer (43) are relatively arranged on the wall of the coal storage bin (4); The steam inlet holes (41) on each steam-permeable layer (43) are communicated with the conveying assembly, and the steam outlet holes (42) on each steam-permeable layer (43) are used to discharge excess steam in the inner cavity of the coal storage bin (4).

4. The device for preventing spontaneous combustion of coal in a coal storage bin according to claim 3, characterized in that: The steam inlet hole (41) on the steam-permeable layer (43) closest to the bottom of the coal storage bin (4) is in the range of 2.5 to 3 meters from the bottom of the coal storage bin (4).

5. The device for preventing spontaneous combustion of coal in a coal storage bin according to claim 4, characterized in that: The steam inlet hole (41) on the steam-permeable layer (43) closest to the top of the coal storage bin (4) is 5 to 6 meters away from the top of the coal storage bin (4).

6. The device for preventing spontaneous combustion of coal in a coal storage bin according to claim 5, characterized in that: The distance between the steam inlet holes (41) on two adjacent steam-permeable layers (43) ranges from 1.5 to 2 meters.

7. The device for preventing spontaneous combustion of coal in a coal storage bin according to claim 3, characterized in that: The conveying assembly comprises a main steam supply pipeline (1) and a plurality of auxiliary steam supply pipelines (2), the number of the auxiliary steam supply pipelines (2) is consistent with the number of steam-permeable layers (43), and each steam-permeable layer (43) corresponds to one auxiliary steam supply pipeline (2); The main steam supply pipeline (1) is in communication with the third steam outlet (3); One end of each of the auxiliary steam supply pipes (2) is in communication with the main steam supply pipe (1), and the other end is in communication with the steam inlet hole (41) of the corresponding steam passage layer (43).

8. The device for preventing spontaneous combustion of coal in a coal storage bin according to claim 7, characterized in that: A first regulating valve (11) is installed on the main steam supply pipeline (1).

9. The device for preventing spontaneous combustion of coal in a coal storage bin according to claim 8, characterized in that: A second regulating valve (21) is installed on the auxiliary steam supply pipeline (2).

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