Rapid load response system for double-inlet and double-outlet coal mill

Abstract

The invention relates to the technical field of coal mills, in particular to a quick load response system for a double-inlet and double-outlet coal mill, which comprises a separator, the first connecting pipeline is connected to one side of the coal mill separator; the other side of the first connecting pipeline is connected with a powder bin; and the other side of the powder bin is connected with a second connecting pipeline, and the first connecting pipeline and the second connecting pipeline are connected to the separator through at least one connecting pipe fitting to form a loop. A control valve assembly is arranged between the pulverized coal bunker and the two pipelines, so that multi-section control over pulverized coal transportation on the whole loop is achieved, it can be guaranteed that the flow of each channel is adjusted through the opening degree of a valve in a double-inlet and double-outlet mode, pulverized coal is evenly distributed, material level establishment and pulverized coal extraction can be completed without shutdown of a coal mill separator, and the coal mill separation efficiency is improved. And the influence on the unit response load change capability is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal mills, in particular to a quick load response system for a double-in double-out coal mill. BACKGROUND

[0002] Currently, with the vigorous development of new energy power generation installed capacity, the requirement of power grid on load response of thermal power plants is higher and higher, fast peak and fast deep adjustment. The traditional double-in double-out direct-fired steel ball coal mill needs to establish the material level and exhaust the coal powder when starting and stopping, and needs 10-20 minutes to normally output and exit operation. In actual work, it will seriously affect the ability of the unit to respond to load changes, therefore, how to solve the load response ability of the coal mill is of great significance. SUMMARY

[0003] In view of the above problems of the load response ability of the coal mill, the present application is proposed.

[0004] Therefore, the purpose of the present application is to provide a quick load response system for a double-in double-out coal mill.

[0005] To solve the above technical problems, the present application provides the following technical scheme: a quick load response system for a double-in double-out coal mill, comprising,

[0006] a separator;

[0007] a first connecting pipeline connected on one side of the coal mill separator;

[0008] a powder bin connected on the other side of the first connecting pipeline; and

[0009] a second connecting pipeline connected on the other side of the powder bin, the first connecting pipeline and the second connecting pipeline being connected to the separator through at least one connecting pipe piece to form a loop;

[0010] a control valve assembly provided between the powder bin and the two pipelines to realize multi-section control of coal powder transportation in the entire loop.

[0011] As a preferred scheme of the quick load response system for a double-in double-out coal mill, wherein: the connecting pipe piece is connected between the second connecting pipeline and the separator, the connecting pipe piece comprises a connecting powder pipe connected on the second connecting pipeline, and a fourth valve installed on the connecting powder pipe to realize dispersed flow transportation of coal powder.

[0012] As a preferred scheme of the application, the connecting pipe includes a connecting powder pipe connected between the second connecting pipe and the separator, and a fourth valve connected between the second connecting pipe, so that the second connecting pipe realizes concentrated transportation after multi-channel flow of the pulverized coal.

[0013] As a preferred scheme of the application, the connecting pipe includes a connecting powder pipe connected between the second connecting pipe and the separator, and a fourth valve connected between the second connecting pipe, so that the second connecting pipe realizes concentrated transportation after multi-channel flow of the pulverized coal.

[0014] As a preferred scheme of the application, the connecting pipe includes a connecting powder pipe connected between the second connecting pipe and the separator, and a fourth valve connected between the second connecting pipe, so that the second connecting pipe realizes concentrated transportation after multi-channel flow of the pulverized coal.

[0015] As a preferred scheme of the application, the connecting pipe includes a connecting powder pipe connected between the second connecting pipe and the separator, and a fourth valve connected between the second connecting pipe, so that the second connecting pipe realizes concentrated transportation after multi-channel flow of the pulverized coal.

[0016] As a preferred scheme of the application, the first connecting pipe includes a first suction pipe, a first transportation pipe, a second suction pipe and a second transportation pipe in sequence.

[0017] As a preferred scheme of the application, the second connecting pipe includes a first outlet powder pipe and a second outlet powder pipe, which are used for transportation of the pulverized coal in the powder bin.

[0018] As a preferred scheme of the application, the valve group includes a first valve connected to the first connecting pipe and a second valve connected to the second connecting pipe.

[0019] As a preferred scheme of the quick load response system for the double-in double-out coal mill, the bag-type dust collector is connected to the powder bin, and the fluidization air valve is connected to the bottom of the powder bin.

[0020] The bag-type dust collector is connected with a communication pipeline, and the third valve is connected to the communication pipeline. The bag-type dust collector transports the coal powder to the furnace through the communication pipeline.

[0021] The benefits of the present application: it can ensure the adjustment of the flow of each channel through the valve opening in the double-in double-out mode, realize the uniform distribution of the coal powder, and complete the material level establishment and coal powder extraction without stopping the mill separator, reduce the influence on the load change response capability of the unit; the bag-type dust collector and the fluidization air valve provided in the powder bin can effectively prevent the powder in the bin from being hardened; during the load adjustment, the load reduction can quickly reduce the amount of coal powder entering the furnace, realizing the rapid load reduction, and the load increase can quickly establish the material level through the powder transportation of the powder bin, improving the load response speed; the connection of the pipe fittings and the valve realizes the combination of the multi-channel flow and the concentrated transportation of the coal powder, when a pipeline is blocked or fails, other pipelines can maintain the flow through the valve switching, improving the system reliability; the dispersion or concentrated transportation design through the powder bin inlet avoids the deviation of the material level in the bin, improves the powder storage efficiency, and the concentrated transportation of the separator inlet reduces the pressure fluctuation and flow fluctuation, prevents the separator from being blocked or the coal powder from backflowing, and balances the relationship between storage and output; the coordinated adjustment of the double pipeline can simultaneously adjust the storage amount of the powder bin and the output amount of the separator when the load changes, maintain the constant air-coal ratio, provide a redundant path for the multi-channel design, and further ensure the stability of the system operation; in addition, the double centralized control mode simplifies the complexity of the coordinated control system, and makes the overall operation more efficient. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0023] Figure 1 It is a structural connection schematic diagram of the quick load response system for the double-in double-out coal mill.

[0024] Figure 2 It is a connection schematic diagram of the pipe fitting in the embodiment 2 of the present application.

[0025] Figure 3 It is a connection schematic diagram of the pipe fitting in the embodiment 3 of the present application.

[0026] Figure 4The connection diagram of the adapter pipe in the embodiment 4 of the present application.

[0027] Figure 5 The connection diagram of the adapter pipe in the embodiment 5 of the present application.

[0028] Figure 6 The structure diagram of a quick load response system for a double-in double-out coal mill.

[0029] Corresponding reference signs in the drawings indicate corresponding parts throughout the several views. The reference signs include 1, separator; 2, first connecting pipeline; 21, first suction pipeline; 22, first transportation pipeline; 23, second suction pipeline; 24, second transportation pipeline; 3, second connecting pipeline; 31, first outlet powder pipeline; 32, second outlet powder pipeline; 4, adapter pipe; 41, adapter powder pipeline; 42, fourth valve; 5, powder bin; 6, valve assembly; 61, first valve; 62, second valve; 7, bag-type dust collector; 71, communication pipeline; 72, third valve; 8, fluidization air valve. DETAILED DESCRIPTION

[0030] In order to make the above objectives, features and advantages of the present application more apparent, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0031] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without the specific details given below. In other instances, well-known methods have not been described in detail in order to avoid unnecessarily obscuring the present application.

[0032] Secondly, the term "one embodiment" or "an embodiment" as used herein means that a particular implementation can include a particular feature, structure, or characteristic, but every embodiment can not necessarily include the particular feature, structure, or characteristic. Furthermore, the following claims can refer to "one embodiment" or "an embodiment" in the sense of claiming a particular feature, structure, or characteristic of more than one embodiment.

[0033] Thirdly, the present application is described in detail with reference to the accompanying drawings. In the detailed description of the embodiments of the present application, the sectional view of the device structure is partially enlarged without the general proportion for the convenience of description, and the schematic diagram is only an example, which should not limit the scope of protection of the present application. In addition, the three-dimensional spatial dimensions of length, width and depth should be included in the actual manufacture.

[0034] Embodiment 1

[0035] Reference Figure 1 and Figure 6For the embodiment of the present application, a quick load response system for a double-in double-out coal mill is provided, which comprises a separator 1, a first connecting pipeline 2 connected to one side of the separator 1, a powder bin 5 connected to the other side of the first connecting pipeline 2, the storage capacity of the powder bin 5 can reach five tons, a second connecting pipeline 3 connected to the other side of the powder bin 5, the first connecting pipeline 2 and the second connecting pipeline 3 are connected to the pipeline leading to the furnace through at least one adapter pipe 4, and the coal powder transported in the separator 1 forms a loop to the furnace; a control valve assembly 6 is arranged between the powder bin 5 and the two pipelines, so that the coal powder transportation is controlled in multiple sections in the entire loop, which can not only ensure the original double-in double-out mode to realize uniform distribution by adjusting the flow of each channel through the valve opening, but also can realize the establishment of material level and the separation of coal powder without stopping to reduce the influence on the unit response to load changes.

[0036] The adapter pipe 4 is arranged between the second connecting pipeline 3 and the separator 1, and the adapter pipe 4 comprises an adapter powder pipe 41 arranged on the second connecting pipeline 3 and a fourth valve 42 installed on the adapter powder pipe 41, which realizes the double-in double-out mode of coal powder and realizes the dispersion and circulation of coal powder.

[0037] Specifically, the first connecting pipeline 2 comprises a first suction pipeline 21, a first transportation pipeline 22, a second suction pipeline 23 and a second transportation pipeline 24 in sequence.

[0038] Further, the second connecting pipeline 3 comprises a first outlet powder pipe 31 and a second outlet powder pipe 32, which are used for coal powder transportation in the powder bin 5.

[0039] Further, the valve group comprises a first valve 61 connected to the first connecting pipeline 2 and a second valve 62 connected to the second connecting pipeline 3, which are used for controlling the coal powder transportation.

[0040] Further, the powder bin 5 is connected to a bag-type dust collector 7, the opening of the bag-type dust collector 7 can make the coal powder stay in the coal bin with the wind, and the coal powder will not pass through the bag-type dust collector 7 to the furnace, but the wind will circulate to the furnace, which will not affect the operation of the entire unit, and the bottom of the powder bin 5 is connected to a fluidization air valve 8 to prevent the powder in the powder bin 5 from being hardened.

[0041] The bag-type dust collector 7 is connected to a communication pipeline 71, the communication pipeline 71 is connected to the pipeline for coal powder transportation to the furnace through the adapter pipe 4 to realize the establishment of material level, the communication pipeline 71 is connected to a third valve 72, and the bag-type dust collector 7 makes the coal powder transported to the pipeline of the furnace through the communication pipeline 71.

[0042] During operation, when the continuous load reduction needs to draw coal powder in the coal mill, other pipes except the first suction pipe 21 and the second suction pipe 23 on one side of the mill separator 1 are closed, the third valve 72 on the communication pipe 71 of the bag dust collector 7 of the powder bin 5 is opened, the second valve 62 on the second connecting pipe 3 on the other side of the powder bin 5 is closed, the first valve 61 on the first suction pipe 21 and the second suction pipe 23 on one side of the powder bin 5 is opened, and the coal powder in the coal mill is drawn and stored in the powder bin 5, so that the coal powder in the coal mill is rapidly reduced, the combustion is weakened, the load is rapidly reduced, and the coal powder in the coal mill is drawn clean.

[0043] When the continuous load increase starts the coal mill and needs to establish the material level, the second valve 62 on the first outlet powder pipe 31 and the second outlet powder pipe 32 needs to be started to transport, so that the coal powder in the powder bin 5 can be transported to the furnace to establish the material level, and through additional increase of the coal powder amount, the load can be rapidly increased, and when the coal powder in the powder bin 5 is drawn clean, the material level is normally established, and the powder bin 5 can be additionally provided with a material level meter, a thermometer, a carbon dioxide concentration measuring device, and a fire extinguishing device connected with an external carbon dioxide cylinder, so that the whole system is more perfect and practical.

[0044] Embodiment 2

[0045] Reference Figure 2 For the embodiment of the present application, a rapid load response system for a double-in double-out coal mill is provided, the device connecting pipe 4 includes a connecting powder pipe 41 arranged between the second connecting pipe 3 and the separator 1, and a fourth valve 42 connected between the second connecting pipe 3, so that the second connecting pipe 3 realizes concentrated transportation after multi-channel flow of coal powder through the fourth valve 42.

[0046] Among them, the connecting powder pipe 41 and the fourth valve 42 on the connecting pipe 4 are connected separately at different positions.

[0047] Among them, the connecting powder pipe 41 is connected with the first outlet powder pipe 31, the second outlet powder pipe 32 and the communication pipe 71 to realize concentrated transportation of the pipes, the fourth valve 42 is connected between the first outlet powder pipe 31 and the second outlet powder pipe 32 to prevent blockage of one pipe from affecting the whole coal powder transportation amount, and the fourth valve 42 is connected between the first outlet powder pipe 31 and the second outlet powder pipe 32 to realize shunting to multiple channels for coal powder transportation to the connecting powder pipe 41.

[0048] During operation, when the material level is established to transport the coal powder in the powder bin 5 to the coal mill, the fourth valve 42 is connected between the two powder pipes, so that when one of the powder pipes is blocked or fails, the other powder pipe can still maintain the flow through the valve switching to improve the reliability.

[0049] Embodiment 3

[0050] ReferenceFigure 3 For the embodiment of the present application, a quick load response system for a double-in double-out coal mill is provided, wherein the device connecting pipe 4 comprises a connecting powder pipe 41 for realizing the final centralized transportation of the second connecting pipeline, and a fourth valve 42 connected to the first connecting pipeline 2, so as to realize the multi-channel dispersed transportation of the coal powder in the first connecting pipeline 2.

[0051] Among them, one connecting powder pipe 41 is connected between the first suction pipeline 21 and the second suction pipeline 23 and connected to the powder bin 5;

[0052] Among them, another connecting powder pipe 41 is connected to the first outlet powder pipe 31, the second outlet powder pipe 32 and the connecting pipeline 71, so as to realize the centralized pipeline transportation.

[0053] Among them, the fourth valve 42 is connected between the first outlet powder pipe 31 and the second outlet powder pipe 32, so as to prevent the blockage of one pipeline from affecting the entire coal powder transportation amount.

[0054] During operation, the final centralized transportation of the coal powder into the powder bin 5 and into the furnace reduces the pressure fluctuation at the inlet of the separator 1 and avoids the deviation of the material level in the powder bin 5.

[0055] Embodiment 4

[0056] Reference Figure 4 For the embodiment of the present application, a quick load response system for a double-in double-out coal mill is provided, wherein the device connecting pipe 4 comprises a connecting powder pipe 41 and a fourth valve 42 connected to the first connecting pipeline 2 and the second connecting pipeline 3 respectively, and a connecting powder pipe 41 connected between the second connecting pipeline 3 and the separator 1, so as to realize the multi-channel transportation of the first connecting pipeline 2 and the second connecting pipeline 3 in the coal powder transportation, and realize the centralized transportation between the second connecting pipeline 3 and the separator 1.

[0057] Among them, one connecting pipe 4 is connected between the first suction pipeline 21 and the second suction pipeline 23, so as to improve the multi-channel flowability of the coal powder extraction;

[0058] Among them, another connecting pipe 4 is connected between the first outlet powder pipe 31 and the second outlet powder pipe 32, so as to increase the multi-channel flowability of the transported coal powder;

[0059] Among them, the connecting powder pipe 41 is connected to the first outlet powder pipe 31, the second outlet powder pipe 32 and the connecting pipeline 71, so as to realize the centralized pipeline transportation.

[0060] In operation, the multi-channel dispersion transportation is realized by connecting the powder pipe 41 and the fourth valve 42, the multi-channel coal powder is concentrated and flows into the separator 1 through the powder pipe 41 arranged at the end, and the multi-level transportation mode is realized by arranging the dispersion at the inlet of the powder bin 5, so as to ensure the transportation, the storage is uniform through the dispersion at the inlet of the powder bin 5, the output is stable through the concentration at the inlet of the separator 1, the powder storage efficiency is improved through the dispersion feeding of the powder bin 5, the quick response to the load demand is ensured through the concentration of the separator 1, the contradiction of “storing more and discharging slowly” is avoided, the storage amount of the powder bin 5 and the output amount of the separator 1 can be adjusted synchronously through the coordinated adjustment of the double-pipeline valves when the load changes, the air-coal ratio is maintained constant, the redundancy path is provided through the multi-channel design, the operation can be maintained through other channels when a pipeline fails, and the reliability is improved.

[0061] Embodiment 5

[0062] With reference to Figure 5 For the embodiment of the application, a quick load response system for a double-in double-out coal mill is provided, the device connecting pipe 4 includes a connecting powder pipe 41 and a fourth valve 42 connected to the first connecting pipeline 2 and the second connecting pipeline 3, and the device connecting pipe 4 is connected between one end of the second connecting pipeline 3 and the separator 1, for realizing the concentrated transportation of the coal powder after the multi-channel flow, the connecting powder pipe 41 is connected between the first connecting pipeline 2, the fourth valve 42 and the powder bin 5, for realizing the concentrated transportation of the coal powder after the multi-channel flow.

[0063] Among them, one device connecting pipe 4 is connected to the first suction pipeline 21 and the second suction pipeline 23, and is connected to the powder bin 5 after being concentrated through the connecting powder pipe 41.

[0064] Among them, another device connecting pipe 4 is connected to the first outlet powder pipe 31 and the second outlet powder pipe 32, and the connecting pipeline 71 is concentrated together through the third device connecting pipe 4 and transported to the furnace pipeline.

[0065] In operation, the multi-channel concentrated transportation to the furnace pipeline is realized through the device connecting pipe 4 arranged at the end, the multi-channel coal powder is concentrated and flows into the powder bin 5 through the connecting powder pipe 41 and the fourth valve 42 arranged in front of the inlet of the powder bin 5, the dispersion to concentration control of the first connecting pipeline 2 is closer to the powder bin 5, the concentration control of the second connecting pipeline 3 is closer to the separator 1, the storage amount can be quickly adjusted through the concentrated transportation at the inlet of the powder bin 5, the output is stable through the concentrated transportation at the inlet of the separator 1, the powder bin 5 storage amount can be quickly supplemented when the load suddenly increases through the multi-channel concentrated feeding, the fluctuation is smoothed through the “buffer pool” effect of the powder bin 5, the flow fluctuation is reduced through the concentrated transportation of the second connecting pipeline 3, the separator 1 is prevented from being blocked or the coal powder from being back-flushed due to the pressure mutation, and the complexity of the coordinated control system is reduced.

[0066] It should be noted that the above examples are only used to illustrate the technical solutions of the present application but not limit the present application. Although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalently replaced, without departing from the spirit and scope of the technical solutions of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. A rapid load response system for a double-inlet, double-outlet coal mill, characterized in that: include, Separator (1); The first connecting pipe (2) is connected to one side of the coal mill separator (1); The other side of the first connecting pipe (2) is connected to a powder hopper (5); and, The powder hopper (5) is connected to a second connecting pipe (3) on the other side. The first connecting pipe (2) and the second connecting pipe (3) are connected to the separator (1) through at least one connecting fitting (4) to form a loop. A control valve assembly (6) is provided between the coal powder silo (5) and the two pipelines, so that the coal powder transportation can be controlled in multiple stages throughout the circuit.

2. The rapid load response system for a double-inlet, double-outlet coal mill according to claim 1, characterized in that: The connecting pipe fitting (4) is connected between the second connecting pipe (3) and the separator (1). The connecting pipe fitting (4) includes a connecting powder pipe (41) connected to the second connecting pipe (3). A fourth valve (42) is installed on the connecting powder pipe (41) for coal powder dispersion and transportation.

3. The rapid load response system for a double-inlet, double-outlet coal mill according to claim 1, characterized in that: The connecting pipe fitting (4) includes a connecting powder pipe (41) connecting the second connecting pipe (3) and the separator (1), and a fourth valve (42) connecting the second connecting pipe (3). The connection of the fourth valve (42) enables the second connecting pipe (3) to realize centralized transportation of coal powder after multi-channel circulation.

4. The rapid load response system for a double-inlet, double-outlet coal mill according to claim 1, characterized in that: The connecting pipe fitting (4) includes a connecting powder pipe (41) that enables the second connecting pipe to achieve centralized transportation, and a fourth valve (42) connected to the first connecting pipe (2) to realize multi-channel decentralized transportation of coal powder in the first connecting pipe (2).

5. The rapid load response system for a double-inlet, double-outlet coal mill according to claim 1, characterized in that: The connecting pipe fitting (4) includes a connecting powder pipe (41) and a fourth valve (42) respectively connected to the first connecting pipe (2) and the second connecting pipe (3). The connecting powder pipe (41) connects the second connecting pipe (3) and the separator (1), so that the first connecting pipe (2) and the second connecting pipe (3) can realize multi-channel transportation in coal powder transportation, and the transportation to the second connecting pipe (3) and the separator (1) can realize centralized transportation.

6. The rapid load response system for a double-inlet, double-outlet coal mill according to claim 1, characterized in that: The connecting pipe fitting (4) includes a connecting powder pipe (41) and a fourth valve (42) connected to the first connecting pipe (2) and the second connecting pipe (3). The connecting pipe fitting (4) is connected between one end of the second connecting pipe (3) and the separator (1) to realize centralized transportation of coal powder after multi-channel circulation. The connecting powder pipe (41) is connected between the first connecting pipe (2), the fourth valve (42) and the powder silo (5) to realize centralized transportation of coal powder after multi-channel circulation.

7. The rapid load response system for a double-inlet, double-outlet coal mill according to claim 6, characterized in that: The first connecting pipe (2) includes, in sequence, a first suction pipe (21), a first transport pipe (22), a second suction pipe (23), and a second transport pipe (24).

8. The rapid load response system for a double-inlet, double-outlet coal mill according to claim 7, characterized in that: The second connecting pipeline (3) includes a first outlet powder pipe (31) and a second outlet powder pipe (32), which are used for transporting coal powder in the powder silo (5).

9. The rapid load response system for a double-inlet, double-outlet coal mill according to claim 8, characterized in that: The valve assembly includes a first valve (61) connected to the first connecting pipe (2) and a second valve (62) connected to the second connecting pipe (3).

10. The rapid load response system for a double-inlet, double-outlet coal mill according to any one of claims 2 to 9, characterized in that: A bag filter (7) is connected to the powder silo (5), and a fluidizing air valve (8) is connected to the bottom of the powder silo (5). The bag filter (7) is connected to a connecting pipe (71), and a third valve (72) is connected to the connecting pipe (71). The bag filter (7) transports pulverized coal to the furnace through the connecting pipe (71).

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