Pulverized coal injection system, pulverized coal preparation system and clean discharge method
By introducing coal powder collectors and sensor control into the coal powder spraying system, the pressure holding problem during coal spraying tank is solved, efficient operation and dust control of coal powder bins are achieved, and production efficiency and recovery rate are improved.
Patent Information
- Application Number
- CN202510330024.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-20
- Publication Date
- 2025-07-11
AI Technical Summary
In the prior art, when the coal spray tank is discharged, a positive pressure is formed in the coal pulverized bin, which affects the powder receiving ability of the coal pulverized bin. The filter area of the bag dust collector on the top of the coal pulverized bin is limited, resulting in the pressure release in the coal pulverized bin, which affects production efficiency and dust spillover.
A coal powder spraying system is designed, including a coal powder collector and coal spraying assembly. The coal powder gas contained in the coal spraying tank is introduced into the coal powder collector for filtering and discharging, avoiding direct discharge to the coal powder bin, increasing the powder receiving capacity of the coal powder bin, and controlling the pressure relief and coal loading process of the coal spraying tank through weighing sensors and pressure sensors.
It effectively solves the pressure hold phenomenon during the replacement of coal spray tanks, improves the speed of tank replacement, increases the recovery rate of coal powder, avoids the pressure hold and dust spillage caused by the untimely release of internal pressure in the coal powder tank, and improves production efficiency and safety.
Smart Images
Figure CN120290796A_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of pulverized coal manufacturing, and in particular to a pulverized coal injection system, a preparation system and a clean emission method. Background Art
[0002] In the pulverized coal combustion production process such as blast furnace or thermal power generation, a large amount of pulverized coal needs to be added to maintain the heat energy required for production. The addition of pulverized coal depends on the pulverized coal preparation system and the injection system to realize the conversion of raw coal into qualified pulverized coal and continuously meet the production needs. The main function of the injection system is to pneumatically convey the qualified pulverized coal in the pulverized coal bin to the blast furnace or burner. The injection system is equipped with a set of parallel coal injection tanks, injection pipes, and a set of distributors. The injection tank fluidization and pressurization use nitrogen to send it to the distributor through the injection pipe.
[0003] Since the coal injection tank is large in size and has high internal pressure, it needs to be depressurized after the injection is completed before the coal powder loading task can be performed. During the depressurization process, a large amount of residual pressure gas is discharged to the coal powder bin through the discharge main pipe, and then filtered and purified by the bag dust collector on the top of the coal powder bin and discharged into the atmosphere.
[0004] At present, a large amount of gas needs to be discharged through the bag dust collector on the top of the coal powder bin every time the coal injection tank is depressurized. The filtering area of the bag dust collector on the top of the coal powder bin is limited. Whenever the coal injection tank is depressurized, the pressure cannot be released in time, resulting in positive pressure in the coal powder bin, which affects the coal powder bin's ability to receive powder. Summary of the invention
[0005] The present disclosure aims to solve at least one of the technical problems existing in the prior art or related art.
[0006] To this end, the present disclosure provides a pulverized coal injection system in a first aspect of the present disclosure, comprising a pulverized coal collector, a pulverized coal bin and a coal injection assembly, wherein the pulverized coal collector is connected to the pulverized coal bin through an ash hopper, wherein the coal injection assembly is provided with a plurality of coal injection tanks, the plurality of coal injection tanks are connected to the pulverized coal bin, and the pulverized coal bin is used to input pulverized coal into the coal injection tank;
[0007] The pulverized coal collector is connected to the plurality of coal injection tanks respectively through input pipelines, and the pulverized coal collector is used to filter the pulverized coal gas when the coal injection tank is depressurized.
[0008] In a feasible implementation manner, the input pipeline includes a main pipeline, a first connecting pipe group and a second connecting pipe group, wherein the first connecting pipe group and the second connecting pipe group are connected to both ends of the main pipeline, wherein:
[0009] The first connecting pipe group includes a plurality of connecting pipelines, the plurality of connecting pipelines are respectively connected to the plurality of coal injection tanks, and a first stop valve is provided on the connecting pipeline;
[0010] The second connecting pipe group includes a first input pipe and a second input pipe, and the second input pipe and the second input pipe are respectively communicated with the inside of the pulverized coal collector.
[0011] In a feasible implementation manner, second stop valves are respectively arranged on the first input pipe and the second input pipe.
[0012] In a feasible implementation manner, a bag filter is arranged on the top of the pulverized coal bin.
[0013] In a feasible implementation manner, the coal injection assembly further includes a weighing sensor and a pressure sensor. The weighing sensor is used to monitor the weight of the coal injection tank, the pressure sensor is used to monitor the internal pressure of the coal injection tank, and the pressure sensor and the weighing sensor are electrically connected to the first stop valve and the second stop valve.
[0014] In a feasible implementation manner, it further includes a maintenance pipeline. One end of the maintenance pipeline is communicated with the pulverized coal bin, and the opposite end is communicated with the input pipeline, and a third stop valve is arranged on the maintenance pipeline.
[0015] In a feasible implementation manner, a corrugated compensator is further arranged on the maintenance pipeline, and the third stop valve is arranged on the side close to the pulverized coal bin.
[0016] In a feasible implementation manner, it further includes a coal loading pipeline. The coal loading pipeline includes a main coal loading pipeline and a plurality of branch pipelines. The main coal loading pipeline is communicated with the pulverized coal bin, and the plurality of branch pipelines respectively communicate a plurality of the coal injection tanks with the main coal loading pipeline.
[0017] In the second aspect of the present disclosure, a pulverized coal preparation system is provided, including the above-mentioned pulverized coal injection system.
[0018] In the third aspect of the present disclosure, a clean emission method for a pulverized coal injection system is provided, which is applied to the pulverized coal injection system provided in the first aspect of the present disclosure, and includes:
[0019] When any coal injection tank is emptied and waiting to be filled with pulverized coal, the input pipeline receives a signal from the coal injection assembly to open the input pipeline, and the pulverized coal-containing gas in the coal injection tank of the coal injection assembly is discharged into the inside of the pulverized coal collector through the input pipeline for filtration;
[0020] The pulverized coal in the filtered pulverized coal-containing gas enters the pulverized coal bin through the ash hopper, and the filtered gas is discharged.
[0021] When the pressure in the tank meets the requirements, the input pipeline receives the signal from the coal injection assembly, and the coal injection tank starts to be filled with pulverized coal.
[0022] Compared with the prior art, the present disclosure has at least the following beneficial effects: By providing a pulverized coal collector to disperse the pulverized coal-containing gas discharged during the pressure relief of the coal injection tank, the pulverized coal-containing gas in the coal injection tank is no longer discharged by pressure relief in the pulverized coal bin, increasing the powder receiving capacity of the pulverized coal bin. Moreover, the pulverized coal in the pulverized coal-containing gas filtered by the pulverized coal collector enters the pulverized coal bin through the ash hopper, thereby increasing the pulverized coal recovery rate. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] The accompanying drawings herein are incorporated into and constitute a part of this specification, showing embodiments consistent with the present disclosure and, together with the specification, are used to explain the principles of the present disclosure.
[0024] To more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0025] By reading the following detailed description of the exemplary embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the exemplary embodiments and are not considered to be a limitation of the present application. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:
[0026] Figure 1 is a front view structural schematic diagram of the present disclosure.
[0027] Among them, Figure 1 the corresponding relationship between the reference numerals in the drawings and the component names is as follows: 1 - pulverized coal collector; 11 - ash hopper; 2 - pulverized coal bin; 31 - coal injection tank; 32 - weighing sensor; 33 - pressure sensor; 4 - input pipeline; 41 - main pipeline; 42 - first input pipe; 43 - second input pipe; 5 - second shut-off valve; 6 - bag filter; 7 - maintenance pipeline; 71 - third shut-off valve; 72 - bellows compensator; 81 - coal loading main pipeline; 82 - branch pipeline. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0028] In order to more clearly understand the above objects, features, and advantages of the present disclosure, the following will further describe the solutions of the present disclosure. It should be noted that, without conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other.
[0029] In the following description, many specific details are set forth to fully understand the present disclosure, but the present disclosure can also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present disclosure, rather than all of the embodiments.
[0030] At present, the volume of each pulverized coal injection tank of large blast furnaces can reach 80 m 3 , the injection pressure is 1.0 Mpa, and the pressure is relieved every 20 - 40 minutes. Each time the pressure is relieved, a large amount of gas needs to be discharged through the bag filter at the top of the pulverized coal bin. The filtering area of the bag filter at the top of the pulverized coal bin is only 230 ㎡. Whenever the pulverized coal injection tank is depressurized, the pressure cannot be relieved in time, resulting in a positive pressure in the pulverized coal bin and affecting the powder receiving capacity of the pulverized coal bin.
[0031] Based on this, the embodiments of the present disclosure provide a pulverized coal injection system. The present disclosure discharges the pulverized coal-containing gas discharged during the pressure relief of the pulverized coal injection tank through a pulverized coal collector, so that the pulverized coal-containing gas in the pulverized coal injection tank is no longer discharged for pressure relief in the pulverized coal bin, increasing the powder receiving capacity of the pulverized coal bin. Moreover, the pulverized coal in the pulverized coal-containing gas filtered by the pulverized coal collector enters the pulverized coal bin through the ash hopper, thereby increasing the pulverized coal recovery rate. It effectively solves the pressure buildup phenomenon during the residual pressure discharge in the process of changing the pulverized coal injection tank, improves the tank-changing speed, eliminates the influence of the discharge process on the powder receiving capacity of the pulverized coal bin, and avoids the pressure buildup and dust overflow phenomena caused by the untimely release of the internal pressure of the pulverized coal bin.
[0032] The following provides a detailed description of the pulverized coal injection system through specific embodiments:
[0033] Referring to Figure 1 As shown, in the first aspect of the present disclosure, a pulverized coal injection system is provided, including a pulverized coal collector 1, a pulverized coal bin 2, and a pulverized coal injection assembly. The pulverized coal collector 1 is communicated with the pulverized coal bin 2 through an ash hopper 11. Among them, the pulverized coal injection assembly is provided with a plurality of pulverized coal injection tanks 31, and the plurality of pulverized coal injection tanks 31 are connected to the pulverized coal bin 2. The pulverized coal bin 2 is used to input pulverized coal into the pulverized coal injection tanks 31; the pulverized coal collector 1 is respectively connected to the plurality of pulverized coal injection tanks 31 through an input pipeline 4, and the pulverized coal collector 1 is used to filter the pulverized coal-containing gas when the pulverized coal injection tanks 31 are depressurized.
[0034] The present disclosure discharges the pulverized coal-containing gas discharged during the pressure relief of the pulverized coal storage tank 31 through the pulverized coal collector 1, so that the pulverized coal-containing gas in the pulverized coal storage tank is no longer discharged under pressure into the pulverized coal bin 2, increasing the powder receiving capacity of the pulverized coal bin. Moreover, the pulverized coal in the pulverized coal-containing gas filtered by the pulverized coal collector enters the pulverized coal bin through the ash hopper, thereby increasing the pulverized coal recovery rate. This effectively solves the pressure buildup phenomenon during the residual pressure discharge in the process of changing the pulverized coal storage tank, improves the tank-changing speed, eliminates the influence of the discharge process on the powder receiving capacity of the pulverized coal bin, and avoids the pressure buildup and dust spillage phenomena caused by the untimely release of the internal pressure of the pulverized coal bin. Specifically, a large-area dust removal cloth bag is installed inside the pulverized coal collector 1, which can filter the pulverized coal particles in the residual pressure gas and quickly discharge them externally to ensure that the external discharge index is qualified. At the same time, during the external discharge process, the high-speed discharging gas forms an instantaneous airflow on the cloth bag inside the collector, shaking off the floating ash on the surface of the bag filter, realizing self-cleaning of the cloth bag. Exemplarily, the pulverized coal collector 1 is connected to the pulverized coal bin 2 through the ash hopper 11. Multiple ash hoppers 11 can be provided. In the present disclosure, the number of ash hoppers 11 is specifically set to two. Conveying pulverized coal through multiple ash hoppers 11 can increase the recovery efficiency. The present disclosure is provided with multiple pulverized coal storage tanks 31 connected to the pulverized coal bin 2. It can be understood that the connection of multiple pulverized coal storage tanks 31 to the pulverized coal bin 2 can be respectively connected to the pulverized coal bin 2 through connecting pipelines. A pneumatic butterfly valve can be installed on the branch pipeline connecting each pulverized coal storage tank 31 and the pulverized coal bin 2 to control the connection and blockage between any pulverized coal storage tank 31 and the pulverized coal bin 2, so as to facilitate the coal loading and pressure relief control of a single pulverized coal storage tank 31. The pulverized coal collector 1 is connected to multiple pulverized coal storage tanks 31 through the input pipeline 4 respectively. Using the negative pressure generated by the pulverized coal collector 1 itself, the pulverized coal-containing gas is sucked from the pulverized coal storage tank 31 through the input pipeline 4 into the pulverized coal collector 1 for filtering and discharging, so that the pressure relief of the pulverized coal storage tank 31 can be realized without adding any external power equipment. Exemplarily, the input pipeline 4 of the present disclosure is designed to connect the pulverized coal storage tank 31 and the pulverized coal collector 1. Multiple pulverized coal storage tanks 31 are respectively connected to the input pipeline 4. When any pulverized coal storage tank 31 needs to be pressure-relieved, the pressure relief port of the pulverized coal storage tank 31 is opened, and the pulverized coal-containing gas enters the pulverized coal collector 1 through the input pipeline 4.
[0035] In some embodiments, the input pipeline 4 includes a main pipeline 41, a first connection pipe group, and a second connection pipe group. The first connection pipe group and the second connection pipe group are connected to both ends of the main pipeline 41. Among them, the first connection pipe group includes multiple connection pipelines, and the multiple connection pipelines are respectively connected to multiple pulverized coal storage tanks 31. A first stop valve is provided on the connection pipeline; the second connection pipe group includes a first input pipe 42 and a second input pipe 43, and the second input pipe 43 and the second input pipe 43 are respectively communicated with the inside of the pulverized coal collector 1.
[0036] In this embodiment, a plurality of connecting pipelines are respectively connected to a plurality of coal injection tanks 31. A first stop valve is arranged on the connecting pipeline to facilitate the individual control of the plurality of coal injection tanks 31, so that the use of other coal injection tanks 31 is not affected when a single coal injection tank 31 is depressurized. The plurality of coal injection tanks 31 can form a cycle of depressurization, coal loading and coal injection, improving the working efficiency of the pulverized coal injection system. Further, the second input pipes 43 of the second connecting pipe group and the second input pipes 43 are respectively communicated with the inside of the pulverized coal collector 1, so that the input flow rate of the pulverized coal-containing gas into the pulverized coal collector 1 is dispersed, ensuring the uniformity of the pulverized coal-containing gas entering the pulverized coal collector 1 and improving the filtering and discharging quality of the pulverized coal collector 1.
[0037] In some embodiments, second stop valves 5 are respectively arranged on the first input pipe 42 and the second input pipe 43. In this embodiment, the second stop valve 5 of the present disclosure can separately open and isolate the first input pipe 42 and the second input pipe 43, and can precisely control the depressurization speed of the coal injection tank 41 and the input flow rate of the pulverized coal collector 1.
[0038] In this embodiment, a bag filter 6 is arranged on the top of the coal powder bin 2. During the maintenance of the pulverized coal collector 1, the coal injection tank 31 can still be depressurized and discharged emergently through the coal powder bin 2.
[0039] In this embodiment, the coal injection assembly 3 further includes a weighing sensor 32 and a pressure sensor 33. The weighing sensor 32 is used to monitor the weight of the coal injection tank 31, and the pressure sensor 33 is used to monitor the internal pressure of the coal injection tank 31. The pressure sensor 33 and the weighing sensor 32 are electrically connected to the first stop valve and the second stop valve 5.
[0040] Specifically, the first stop valve and the second stop valve 5 of the present disclosure adopt pneumatic control, and the valve signals of the first stop valve and the second stop valve 5 are interlocked to ensure that the residual pressure gas does not enter the coal powder bin dust collector during normal exhaust, avoiding the pressure buildup in the coal powder bin and causing the coal powder to be unable to be discharged smoothly.
[0041] The start and stop of the second stop valve 5 are interlocked with the operation signal of the powder discharging fan to ensure that the discharged gas can enter the pulverized coal collector 1 for discharging through the input pipeline 4 only when the powder discharging fan is operating to provide negative pressure, avoiding the pressure buildup in the pulverized coal collector 1 and damaging the box body or the cloth bag.
[0042] Interlock the weighing signal and pressure signal in the pulverized coal injection tank with each second shut-off valve 5 at the inlet of the pulverized coal collector 1. When the weight in the pulverized coal injection tank 31 is at a low level and coal loading is required, the second shut-off valve 5 is automatically opened to discharge the residual pressure in the tank. When the pressure in the tank reaches the set value, the second shut-off valve 5 is closed, and the pulverized coal injection tank starts to load coal. Exemplarily, the two second shut-off valves 5 can be controlled separately, and one or all of them can be opened separately when the second shut-off valve 5 receives an open signal, and are adaptively set according to the required working conditions.
[0043] In some embodiments, it further includes a maintenance pipeline 7. One end of the maintenance pipeline 7 is connected to the pulverized coal bin 2, and the opposite end is connected to the input pipeline 4. In this embodiment, when the pulverized coal collector 1 and the powder exhaust fan need to be shut down for maintenance, to avoid affecting the maintenance equipment, the second shut-off valve 5 is closed, and at the same time the third shut-off valve 71 is opened, and the discharged gas enters the pulverized coal bin 2 and is slowly discharged through the original bag filter 6 on the top of the bin. Exemplarily, the first shut-off valve, the second shut-off valve 5 and the third shut-off valve 71 of the present disclosure are selected as pneumatic butterfly valves, specifically DN100-600.
[0044] 7. The pulverized coal injection system according to claim 6, wherein a corrugated compensator 72 is further provided on the maintenance pipeline 7, and the third shut-off valve 71 is arranged on the side close to the pulverized coal bin 2. The corrugated compensator belongs to a compensation element, and uses the effective telescopic deformation of its working main body bellows to absorb the dimensional changes of pipelines, ducts, containers, etc. caused by thermal expansion and contraction, etc., or compensate for the axial, lateral and angular displacements of pipelines, ducts, containers, etc., and can be used to reduce the vibration of the maintenance pipeline 7.
[0045] In this embodiment, it further includes a coal loading pipeline. The coal loading pipeline includes a main coal loading pipeline 41 and a plurality of branch pipelines. The main coal loading pipeline 41 is connected to the pulverized coal bin 2, and the plurality of branch pipelines respectively connect a plurality of pulverized coal injection tanks 31 to the main coal loading pipeline 41, and a fourth shut-off valve is provided on the branch pipeline.
[0046] In this embodiment, each branch pipeline connects a plurality of pulverized coal injection tanks 31 to the main coal loading pipeline 41, and a fourth shut-off valve is provided on the branch pipeline to facilitate the individual control of the coal loading of each pulverized coal injection tank 31.
[0047] In the second aspect of the present disclosure, a pulverized coal preparation system is provided, including the pulverized coal injection system provided in the first aspect of the present disclosure.
[0048] In the third aspect of the present disclosure, a clean emission method for a pulverized coal injection system is provided, which is applied to the pulverized coal injection system provided in the first aspect of the present disclosure, and includes:
[0049] When any one of the pulverized coal injection tanks 31 is emptied and waiting to be filled with pulverized coal, the input pipeline 4 receives the signal of the pulverized coal injection assembly to open the input pipeline 4, and the pulverized coal-containing gas in the pulverized coal injection tank 31 of the pulverized coal injection assembly is discharged into the pulverized coal collector 1 through the input pipeline 4 for filtration inside the pulverized coal collector 1;
[0050] The pulverized coal in the filtered pulverized coal-containing gas enters the pulverized coal bin 2 through the ash hopper 11, and the filtered gas is discharged;
[0051] When the pressure in the tank meets the requirements, the input pipeline 4 receives the signal of the pulverized coal injection assembly, and the pulverized coal injection tank 31 starts to be filled with pulverized coal.
[0052] In the present disclosure, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance; the term "plural" means two or more, unless otherwise clearly defined. Terms such as "installed", "connected", "connected", "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.
[0053] In the description of the present disclosure, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present disclosure.
[0054] In the description of this specification, the description of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.
[0055] The above are only the preferred embodiments of the present disclosure and are not used to limit the present disclosure. For those skilled in the art, the present disclosure can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present disclosure shall be included within the protection scope of the present disclosure.
Claims
1. A pulverized coal injection system, characterized in that, It includes a pulverized coal collector, a pulverized coal bin, and a coal injection assembly. The pulverized coal collector is communicated with the pulverized coal bin through a hopper. Among them, the coal injection assembly is provided with a plurality of coal injection tanks, and the plurality of coal injection tanks are connected to the pulverized coal bin. The pulverized coal bin is used to input pulverized coal into the coal injection tanks; the pulverized coal collector is respectively connected to the plurality of coal injection tanks through an input pipeline. The pulverized coal collector is used to filter the pulverized coal-containing gas when the coal injection tank is depressurized.
2. The pulverized coal injection system according to claim 1, characterized in that, The input pipeline includes a main pipeline, a first connection pipe group, and a second connection pipe group. The first connection pipe group and the second connection pipe group are connected to both ends of the main pipeline. Among them, the first connection pipe group includes a plurality of connection pipelines, and the plurality of connection pipelines are respectively connected to the plurality of coal injection tanks. A first stop valve is arranged on the connection pipeline; the second connection pipe group includes a first input pipe and a second input pipe, and the second input pipe and the second input pipe are respectively communicated with the inside of the pulverized coal collector.
3. The pulverized coal injection system according to claim 2, wherein, Second stop valves are respectively arranged on the first input pipe and the second input pipe.
4. The pulverized coal injection system according to claim 1, characterized in that, A bag filter is arranged on the top of the pulverized coal bin.
5. The pulverized coal injection system according to claim 3, characterized in that, The coal injection assembly further includes a weighing sensor and a pressure sensor. The weighing sensor is used to monitor the weight of the coal injection tank, and the pressure sensor is used to monitor the internal pressure of the coal injection tank. And the pressure sensor and the weighing sensor are electrically connected to the first stop valve and the second stop valve.
6. The pulverized coal injection system according to claim 1, characterized in that, It further includes a maintenance pipeline. One end of the maintenance pipeline is communicated with the pulverized coal bin, and the opposite end is communicated with the input pipeline. And a third stop valve is arranged on the maintenance pipeline.
7. The pulverized coal injection system according to claim 6, characterized in that, A corrugated compensator is further arranged on the maintenance pipeline, and the third stop valve is arranged on the side close to the pulverized coal bin.
8. The pulverized coal injection system according to claim 1, characterized in that, It further includes a coal loading pipeline. The coal loading pipeline includes a coal loading main pipeline and a plurality of branch pipelines. The coal loading main pipeline is communicated with the pulverized coal bin, and the plurality of branch pipelines respectively communicate the plurality of coal injection tanks with the coal loading main pipeline.
9. A pulverized coal preparation system, characterized in that, It includes the pulverized coal injection system according to any one of claims 1 to 8.
10. A method for clean emission of a pulverized coal injection system, applied to the pulverized coal injection system according to any one of claims 1 to 8, characterized in that, It includes: When any one of the coal injection tanks is emptied and waiting to be filled with pulverized coal, the input pipeline receives a signal from the coal injection assembly to open the input pipeline. The pulverized coal-containing gas in the coal injection tank of the coal injection assembly is discharged into the pulverized coal collector through the input pipeline for internal filtration; The pulverized coal in the filtered pulverized coal-containing gas enters the pulverized coal bin through the hopper, and the filtered gas is discharged; When the pressure in the tank meets the requirements, the input pipeline receives the signal from the coal injection assembly, and the coal injection tank starts to fill with pulverized coal.