Coal blending co-combustion system based on belt conveyor with vertical process modules

Abstract

The present invention relates to a coal blending co-combustion system based on a belt conveyor with vertical process modules, comprising: a No.1 coal feeding system, which is provided with a 1A discharge port and a 1B discharge port for outputting coal type A; a No.2 coal feeding system, which is provided with a 2A discharge port and a 2B discharge port for outputting coal type B; a first belt conveyor A, which is provided with a 1A electronic scale and a 2A electronic scale; a first belt conveyor B, which is provided with a 1B electronic scale and a 2B electronic scale; a vertical drop cute; a second belt conveyor, which is configured to convey coal material output from the vertical drop chute; a third belt conveyor, which is configured to convey the coal material output from the second belt conveyor to a coal supply end; and a controller, which is used for coal blending on the first belt conveyor A, the first belt conveyor B or the second belt conveyor. Compared with the prior art, the present invention provides solutions for coal feeding systems when coal blending conditions are not met, and can achieve the advantages of high flexibility in switching between single coal types and blended coals, higher precision in coal blending ratios, and more thorough mixing between different coal types.

Description

A coal blending and combustion system based on a belt conveyor with vertical process modules Technical Field

[0001] This invention relates to the field of coal blending and combustion, and in particular to a coal blending and combustion system based on a belt conveyor with vertical process modules. Background Technology

[0002] In coal conveying systems, it is often necessary to blend coal for combustion in order to optimize coal characteristics, improve combustion efficiency, reduce pollution emissions, improve resource utilization, and meet boiler design requirements.

[0003] Existing coal mixing methods include the grab bucket method and the pile mixing method. The working principle of the grab bucket method is as follows: the grab bucket coefficient of each type of coal is determined according to the predetermined coal blending ratio, then the grab bucket machine grabs and mixes the corresponding amount of coal, and finally the mixed coal pile is moved to a standby location.

[0004] The working principle of the coal mixing method is to pile up raw coal of different qualities in a pre-set ratio and method, and then mix them.

[0005] However, due to various circumstances such as equipment incompatibility or site conditions not being suitable, the coal feeding system may not be applicable to coal mixing methods such as grab bucket method or pile mixing method. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the existing technology, such as the inability of the coal feeding system to use coal mixing methods such as grab bucket method or pile mixing method due to various situations such as equipment incompatibility or site conditions, and thus the inability to achieve coal mixing. The invention provides a coal blending and combustion system based on a belt conveyor with vertical process modules.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] A coal blending and combustion system based on a belt conveyor with vertical process modules includes:

[0009] The No. 1 coal feeding system is equipped with a 1A discharge port and a 1B discharge port for outputting coal of type A.

[0010] The No. 2 coal feeding system is equipped with a 2A discharge port and a 2B discharge port for outputting coal type B.

[0011] The first belt conveyor A is directly opposite the 2A discharge port and the 1A discharge port, and is equipped with an electronic scale 1A located behind the 1A discharge port and an electronic scale 2A located behind the 2A discharge port respectively.

[0012] The first belt conveyor B is directly opposite the 2B discharge port and the 1B discharge port, and is equipped with an electronic scale 1B located behind the 1B discharge port and an electronic scale 2B located behind the 2B discharge port.

[0013] A vertical discharge pipe is provided with an inlet at the top and an outlet at the bottom. The inlet is connected to a first belt conveyor A and a first belt conveyor B, and the outlet is connected to a second belt conveyor.

[0014] The second belt conveyor is used to transport the coal material output from the vertical drop pipe;

[0015] The third belt conveyor is used to transport the coal output from the second belt conveyor to the coal supply end;

[0016] The controller is connected to the No. 1 coal feeding system, the No. 2 coal feeding system, the 1A electronic scale, the 2A electronic scale, the 1B electronic scale, and the 2B electronic scale, respectively, and is used to mix coal of type A and coal of type B on the first belt conveyor A, the first belt conveyor B, or the second belt conveyor.

[0017] Furthermore, the control process for blending coal of type A and type B on the first conveyor belt A includes the following steps:

[0018] S101: Start the first conveyor belt A; set the coal blending flow rate for coal type A and coal type B;

[0019] S102: Start coal feeding system No. 1 and coal feeding system No. 2, open discharge port 1A and discharge port 2A, and release coal to the first belt conveyor A at the same time;

[0020] S103: Determine whether the flow rate detected by the 2A electronic scale is the same as the coal blending flow rate of coal type B. If not, adjust the discharge rate of the 2A outlet and repeat step S103; otherwise, proceed to step S104.

[0021] S104: Determine whether the difference between the flow rate detected by electronic scale 1A and the flow rate detected by electronic scale 2A is equal to the coal blending flow rate of coal type A. If not, adjust the discharge rate of outlet 1A and repeat step S104; otherwise, proceed to step S105.

[0022] S105: Repeat steps S103-S104 until a coal mixing stop command is received.

[0023] Furthermore, the control process for blending coal of type A and type B on the first conveyor belt B includes the following steps:

[0024] S111: Start the first conveyor belt B; set the coal blending flow rate for coal type A and coal type B;

[0025] S112: Start coal feeding system No. 1 and coal feeding system No. 2, open discharge port 1B and discharge port 2B, and release coal to the first belt conveyor B at the same time;

[0026] S113: Determine whether the flow rate detected by the 2B electronic scale is the same as the coal blending flow rate of coal type B. If not, adjust the discharge rate of the 2B outlet and repeat step S103; otherwise, proceed to step S104.

[0027] S114: Determine whether the difference between the flow rate detected by electronic scale 1B and the flow rate detected by electronic scale 2B is equal to the coal blending flow rate of coal type A. If not, adjust the discharge rate of discharge port 1B and repeat step S114; otherwise, proceed to step S115.

[0028] S115: Repeat steps S113-S114 until a coal mixing stop command is received.

[0029] Furthermore, the control process for blending coal of type A and type B on the second belt conveyor includes the following steps:

[0030] S201: Start the belt conveyor of the first belt conveyor A and the belt conveyor of the first belt conveyor B respectively; set the coal blending flow rate of coal type A and coal type B.

[0031] S202: Start coal feeding system No. 1 and coal feeding system No. 2, open discharge port 1A and discharge port 2B, and release coal to the first belt conveyor A and the first belt conveyor B respectively;

[0032] S203: The coal from the first belt conveyor A and the first belt conveyor B both fall through the vertical drop pipe onto the second belt conveyor for mixing.

[0033] S204: Determine whether the flow rate detected by the 1A electronic scale is the same as the coal blending flow rate of coal type A. If not, adjust the discharge rate of the 1A outlet and repeat step S204. Determine whether the flow rate detected by the 2B electronic scale is the same as the coal blending flow rate of coal type B. If not, adjust the discharge rate of the 2B outlet and repeat step S204.

[0034] S205: Repeat step S204 until a coal mixing stop command is received.

[0035] Furthermore, the second belt conveyor includes a second belt conveyor A and a second belt conveyor B, which are connected in parallel at the output port of the vertical discharge pipe. The third belt conveyor includes a third belt conveyor A and a third belt conveyor B, with the third belt conveyor A connected to the second belt conveyor A and the third belt conveyor B connected to the second belt conveyor B. The third belt conveyor A is equipped with an electronic scale, and the third belt conveyor B is equipped with an electronic scale. The vertical discharge pipe is equipped with a baffle and a driver for rotating the baffle, which is used to divert the coal material flowing into the input port of the vertical discharge pipe to the second belt conveyor A and the second belt conveyor B.

[0036] Furthermore, the control process for blending coal of type A and type B on the second belt conveyor includes the following steps:

[0037] S301: Start the belt conveyor of the first belt conveyor A and the belt conveyor of the first belt conveyor B respectively; set the coal blending flow rate of coal type A and coal type B.

[0038] S302: Start coal feeding system No. 1 and coal feeding system No. 2, open discharge port 1A and discharge port 2B, and release coal to first belt conveyor A and first belt conveyor B respectively;

[0039] S303: Determine whether the flow rate detected by the 1A electronic scale is the same as the coal blending flow rate of coal type A. If not, adjust the discharge rate of the 1A outlet and repeat step S303. Determine whether the flow rate detected by the 2B electronic scale is the same as the coal blending flow rate of coal type B. If not, adjust the discharge rate of the 2B outlet and repeat step S303.

[0040] S304: Drive the baffle inside the vertical discharge pipe to rotate to the middle position where the flow is split between the second conveyor belt A and the second conveyor belt B by the driver;

[0041] S305: Determine whether the flow rate detected by the electronic scale of the third conveyor belt A is the same as the average value of the total flow rate of coal type A and coal type B. If not, adjust the angle of the baffle inside the vertical discharge pipe. Determine whether the flow rate detected by the electronic scale of the third conveyor belt B is the same as the average value of the total flow rate of coal type A and coal type B. If not, adjust the angle of the baffle inside the vertical discharge pipe.

[0042] S306: Repeat steps S303-S305 until a coal mixing stop command is received.

[0043] Furthermore, the control process for blending coal of type A and type B on the second belt conveyor includes the following steps:

[0044] S401: Start the belt conveyor of the first belt conveyor A and the belt conveyor of the first belt conveyor B respectively;

[0045] S402: Start coal feeding system No. 1 and coal feeding system No. 2, open discharge port 1A and discharge port 2B, and release coal to the first belt conveyor A and the first belt conveyor B respectively;

[0046] S403: The driver drives the baffle inside the vertical feeding pipe to rotate, so that all of the B coal falls into the second belt conveyor A. The A coal is partially mixed with the B coal according to the actual coal blending requirements and falls into the second belt conveyor A; the rest falls into the second belt conveyor B.

[0047] Furthermore, the vertical discharge tube is also equipped with an angle sensor to measure the rotation angle of the baffle.

[0048] Furthermore, the bottom of the vertical discharge pipe is also equipped with belt conveyor A and belt conveyor B, which are used to convey coal to the second belt conveyor A and the second belt conveyor B, respectively.

[0049] Furthermore, during the coal blending control process, the controller also continuously performs a coal supply interruption interlocking protection step: after detecting that the No. 2 coal feeding system is discharging material, the No. 1 coal feeding system discharges material; when the No. 1 or No. 2 coal feeding system is detected to be cutting off coal, the other coal feeding system stops discharging material.

[0050] By judging the flow rate value output by the electronic scale set at the discharge port of coal feeding system No. 1 or coal feeding system No. 2, it can be determined whether coal feeding system No. 1 or coal feeding system No. 2 is discharging material.

[0051] Compared with the prior art, the present invention has the following advantages:

[0052] (1) This invention innovatively proposes a coal blending scheme on the belt conveyor of a belt conveyor, providing a solution when the coal feeding system does not have the conditions for coal blending. It can achieve the advantages of high flexibility in switching between single coal type and mixed coal, more accurate coal blending ratio, and more thorough mixing between different coal types.

[0053] (2) This invention proposes that the discharge ports of two different coal feeding systems on the same belt conveyor can be opened simultaneously, and the flow rate of each discharge port can be controlled to achieve proportional coal mixing; all coal can be discharged to belt conveyor No. 11 through the vertical discharge pipe for coal mixing, so that the flow rate on belt conveyor No. 10 can be controlled in real time, and the control ratio can be most accurate; the two coal flows can be equally divided to belt conveyor A / B of No. 11 through the baffle, so that both belt conveyor A / B of No. 11 are mixed coal, and the proportion of coal types is the same. This scheme ensures coal supply on both belts and the initial ratio control is relatively accurate; one type of coal can be discharged to a single belt, and the baffle of the other type of coal can be adjusted according to the actual coal blending needs to separate the required flow rate to mix with the first type of coal. The excess coal flow rate goes to another belt, and the ratio can be controlled in two levels through the electronic scale of belt conveyor No. 12.

[0054] (3) The vertical drop pipe of the present invention makes it easier for coal to be diverted by the baffle after it falls, and the mixing between different coal types is more thorough during the vertical drop process, making the subsequent coal blending and combustion effect more stable. Attached Figure Description

[0055] Figure 1 is a schematic diagram of the overall structure of a coal blending and combustion system based on a belt conveyor with a vertical process module provided in an embodiment of the present invention;

[0056] Figure 2 is a schematic diagram of a direct coal mixing process on the outlet conveyor belt of a coal feeding system provided in an embodiment of the present invention.

[0057] Figure 3 is a schematic diagram of a single-path direct coal mixing process on belt conveyor No. 11 provided in an embodiment of the present invention.

[0058] Figure 4 is a schematic diagram of a dual-path equal-division coal mixing process (including protection strategy) for a No. 11 belt conveyor provided in an embodiment of the present invention;

[0059] Figure 5 is a schematic diagram of the position of a tilt sensor provided in an embodiment of the present invention. Detailed Implementation

[0060] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0061] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0062] 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 further defined and explained in subsequent figures.

[0063] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed during use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0064] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0065] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.

[0066] Example 1

[0067] As shown in Figure 1, this embodiment provides a coal blending and combustion system based on a belt conveyor with a vertical process module, including:

[0068] The No. 1 coal feeding system is equipped with a 1A discharge port and a 1B discharge port for outputting coal of type A.

[0069] The No. 2 coal feeding system is equipped with a 2A discharge port and a 2B discharge port for outputting coal type B.

[0070] The first belt conveyor A (belt conveyor A No. 10) is directly opposite the 2A discharge port and the 1A discharge port, and is equipped with an electronic scale 1A located behind the 1A discharge port and an electronic scale 2A located behind the 2A discharge port.

[0071] The first belt conveyor B (belt conveyor B No. 10) is directly opposite the 2B discharge port and the 1B discharge port, and is equipped with an electronic scale 1B located behind the 1B discharge port and an electronic scale 2B located behind the 2B discharge port.

[0072] The vertical discharge pipe has an inlet at the top and an outlet at the bottom. The inlet is connected to the first belt conveyor A and the first belt conveyor B, and the outlet is connected to the second belt conveyor.

[0073] The second belt conveyor (belt conveyor No. 11) is used to transport the coal material output from the vertical drop pipe;

[0074] The controller is connected to the No. 1 coal feeding system, the No. 2 coal feeding system, the 1A electronic scale, the 2A electronic scale, the 1B electronic scale, and the 2B electronic scale, respectively, and is used to mix coal of type A and coal of type B on the first belt conveyor A, the first belt conveyor B, or the second belt conveyor.

[0075] In this embodiment, in the belt conveyor coal blending system, coal feeding system No. 1 (coal type A) has two discharge ports (1A / 1B) for belt conveyor A / B of No. 10, and coal feeding system No. 2 (coal type B) has two discharge ports (2A / 2B) for belt conveyor A / B of No. 10. Belt conveyors A / B can freely choose their downstream conveyor. Electronic scales are installed at the coal flow direction of the discharge ports of belt conveyors A / B of No. 10, and the downstream conveyors also have electronic scales to determine the flow rate. Therefore, the system can choose to perform coal blending directly on the belt conveyor.

[0076] Specifically, the following solutions are included:

[0077] Option 1: Directly mix coal onto the conveyor belt at the feeder outlet.

[0078] The control process for blending coal of type A and type B on the first conveyor belt A includes the following steps:

[0079] S101: Start the first conveyor belt A; set the coal blending flow rate for coal type A and coal type B;

[0080] S102: Start coal feeding system No. 1 and coal feeding system No. 2, open discharge port 1A and discharge port 2A, and release coal to the first belt conveyor A at the same time;

[0081] S103: Determine whether the flow rate detected by the 2A electronic scale is the same as the coal blending flow rate of coal type B. If not, adjust the discharge rate of the 2A outlet and repeat step S103; otherwise, proceed to step S104.

[0082] S104: Determine whether the difference between the flow rate detected by electronic scale 1A and the flow rate detected by electronic scale 2A is equal to the coal blending flow rate of coal type A. If not, adjust the discharge rate of outlet 1A and repeat step S104; otherwise, proceed to step S105.

[0083] S105: Repeat steps S103-S104 until a coal mixing stop command is received.

[0084] The same procedure applies to the blending of coal types A and B on the first conveyor belt B, which includes the following steps:

[0085] S111: Start the first conveyor belt B; set the coal blending flow rate for coal type A and coal type B;

[0086] S112: Start coal feeding system No. 1 and coal feeding system No. 2, open discharge port 1B and discharge port 2B, and release coal to the first belt conveyor B at the same time;

[0087] S113: Determine whether the flow rate detected by the 2B electronic scale is the same as the coal blending flow rate of coal type B. If not, adjust the discharge rate of the 2B outlet and repeat step S103; otherwise, proceed to step S104.

[0088] S114: Determine whether the difference between the flow rate detected by electronic scale 1B and the flow rate detected by electronic scale 2B is equal to the coal blending flow rate of coal type A. If not, adjust the discharge rate of discharge port 1B and repeat step S114; otherwise, proceed to step S115.

[0089] S115: Repeat steps S113-S114 until a coal mixing stop command is received.

[0090] The proposed solution involves simultaneously opening the feed ports of two different coal feeding systems on the same conveyor belt. Specifically, when conveyor belt A (No. 10) is running, discharge ports 1A and 2A are opened, and coal is mixed in proportion by controlling the discharge port flow rate.

[0091] This coal mixing method is the most intuitive, and because the flow rates at different discharge outlets can be controlled independently, the No. 10 belt conveyor can simultaneously transport coals of different proportions in both directions. However, since the electronic scale at the outlet of the feeding system shows the weight of the mixed coal, the actual flow rate at the outlet of the No. 1 feeding system needs to be calculated and confirmed, resulting in a relatively slow adjustment.

[0092] Option 2: Direct coal mixing on a single conveyor belt No. 11

[0093] The control process for blending coal of type A and type B on the second belt conveyor (belt conveyor No. 11) includes the following steps:

[0094] S201: Start the belt conveyor of the first belt conveyor A and the belt conveyor of the first belt conveyor B respectively; set the coal blending flow rate of coal type A and coal type B.

[0095] S202: Start coal feeding system No. 1 and coal feeding system No. 2, open discharge port 1A and discharge port 2B, and release coal to the first belt conveyor A and the first belt conveyor B respectively;

[0096] S203: The coal from the first belt conveyor A and the first belt conveyor B both fall through the vertical drop pipe onto the second belt conveyor for mixing.

[0097] S204: Determine whether the flow rate detected by the 1A electronic scale is the same as the coal blending flow rate of coal type A. If not, adjust the discharge rate of the 1A outlet and repeat step S204. Determine whether the flow rate detected by the 2B electronic scale is the same as the coal blending flow rate of coal type B. If not, adjust the discharge rate of the 2B outlet and repeat step S204.

[0098] S205: Repeat step S204 until a coal mixing stop command is received.

[0099] This scheme involves opening the discharge ports on different sides of two coal feeding systems, allowing belt conveyors A and B (number 10) to each carry one type of coal, which is then mixed on belt conveyor B (number 11), as shown in Figure 2. Specifically, belt conveyor A (number 10) operates with discharge port 1A open, while belt conveyor B (number 10) operates with discharge port 2B open. All coal is then discharged via a vertical drop pipe onto belt conveyor A (number 11) to complete the mixing process.

[0100] This coal mixing method allows for real-time control of the flow rate on conveyor belt No. 10, with the most precise control ratio. However, single-path operation will lengthen the filling time and poses a risk of stopping conveyor belt No. 11 when the instantaneous flow rate is too large.

[0101] Option 3: Use dual-path equal-division blended coal on conveyor belt No. 11.

[0102] The second conveyor belt (conveyor belt No. 11) includes conveyor belt A and conveyor belt B, which are connected in parallel at the output port of the vertical feed pipe. The third conveyor belt (conveyor belt No. 12) includes conveyor belt A and conveyor belt B, with conveyor belt A connected to conveyor belt A and conveyor belt B connected to conveyor belt B. Belt belt A is equipped with an electronic scale, and conveyor belt B is equipped with an electronic scale. The vertical feed pipe contains a baffle and a driver that rotates the baffle to divert the coal flowing into the vertical feed pipe input port to conveyor belts A and B.

[0103] Preferably, the bottom of the vertical discharge pipe is also equipped with belt conveyor A and belt conveyor B, which are used to convey coal to the second belt conveyor A and the second belt conveyor B, respectively.

[0104] The control process for blending coal of type A and type B on the second belt conveyor includes the following steps:

[0105] S301: Start the belt conveyor of the first belt conveyor A and the belt conveyor of the first belt conveyor B respectively; set the coal blending flow rate of coal type A and coal type B.

[0106] S302: Start coal feeding system No. 1 and coal feeding system No. 2, open discharge port 1A and discharge port 2B, and release coal to first belt conveyor A and first belt conveyor B respectively;

[0107] S303: Determine whether the flow rate detected by the 1A electronic scale is the same as the coal blending flow rate of coal type A. If not, adjust the discharge rate of the 1A outlet and repeat step S303. Determine whether the flow rate detected by the 2B electronic scale is the same as the coal blending flow rate of coal type B. If not, adjust the discharge rate of the 2B outlet and repeat step S303.

[0108] S304: Drive the baffle inside the vertical discharge pipe to rotate to the middle position where the flow is split between the second conveyor belt A and the second conveyor belt B by the driver;

[0109] S305: Determine whether the flow rate detected by the electronic scale of the third conveyor belt A is the same as the average value of the total flow rate of coal type A and coal type B. If not, adjust the angle of the baffle inside the vertical discharge pipe. Determine whether the flow rate detected by the electronic scale of the third conveyor belt B is the same as the average value of the total flow rate of coal type A and coal type B. If not, adjust the angle of the baffle inside the vertical discharge pipe.

[0110] S306: Repeat steps S303-S305 until a coal mixing stop command is received.

[0111] The plan involves opening the discharge ports on different sides of the two coal feeding systems, so that each of the No. 10 conveyor belts A and B carries one type of coal. At the vertical drop pipe, a baffle is used to divide the coal flow equally onto the No. 11 conveyor belts A and B, so that both conveyor belts A and B carry mixed coal with the same proportion of coal types.

[0112] This coal blending scheme ensures coal supply on both routes and relatively precise initial ratio control. However, the coal blending is the same on both routes, and in order to meet the needs of both routes simultaneously, the flow rate of high-proportion coal is increased at conveyor belt No. 10, which poses a risk of causing the conveyor belt to stop.

[0113] Option 4: Use the feeding system on conveyor belt No. 11 to mix coal.

[0114] The control process for blending coal of type A and type B on the second belt conveyor includes the following steps:

[0115] S401: Start the belt conveyor of the first belt conveyor A and the belt conveyor of the first belt conveyor B respectively;

[0116] S402: Start coal feeding system No. 1 and coal feeding system No. 2, open discharge port 1A and discharge port 2B, and release coal to the first belt conveyor A and the first belt conveyor B respectively;

[0117] S403: The driver drives the baffle inside the vertical feed pipe to rotate, so that all of the B coal falls into the second belt conveyor A. The A coal is partially mixed with the B coal according to the actual coal blending requirements and falls into the second belt conveyor A; the rest falls into the second belt conveyor B.

[0118] The scheme will open the discharge ports on different sides of the two coal feeding systems, so that belt conveyors A and B of No. 10 each carry one type of coal. When passing through the discharge pipe, all of coal type B will fall onto a single belt conveyor. Coal type A will adjust the baffle according to the actual coal blending needs, and the required flow rate will be separated to mix with coal type B. The excess flow rate of coal type A will go to another belt conveyor.

[0119] This method can achieve a two-level control ratio through the electronic scale of belt conveyor No. 12, but the disadvantage is that a single bin needs to be emptied to store excess coal type A.

[0120] Preferably, regardless of the coal blending method used in the above scheme, the primary task on the control side is to activate the PID control of the feeder. PID control adjusts the discharge port amplitude based on the flow rate of the No. 10 belt conveyor's electronic scale. In the initial stage of operation, the feed system flow rate needs to be set according to the preset feed ratio and flow rate. When the flow rate does not meet the system's requirements, the discharge port flow rate is automatically adjusted. At the same time, when the proportion of coal type A is too high, the proportion of coal type A is reduced to prevent deviation in combustion calorific value.

[0121] Preferably, the above-mentioned scheme requiring baffles needs to be equipped with tilt sensors to accurately divert the flow from conveyor belt 10 to conveyor belt 11, and to determine the stability of the flow rate by comparing it with the electronic scale of conveyor belt 12. Initially, the landing points and angles of different coal types need to be collected and enumerated, and after finding a suitable monitoring area, PID control is performed with the electronic scale of conveyor belt 12.

[0122] Preferably, when the belt conveyor is mixing coal, in order to ensure that all outputs are mixed coal, the system will be equipped with a lockout function. That is, after the No. 2 coal feeding system is detected to be discharging, the No. 1 coal feeding system will discharge; when the No. 1 or No. 2 coal feeding system is detected to be cutting off coal, the other coal feeding system will stop discharging to prevent coal type A from being discharged alone, which would cause a deviation in calorific value.

[0123] By judging the flow rate value output by the electronic scale set at the discharge port of coal feeding system No. 1 or coal feeding system No. 2, it can be determined whether coal feeding system No. 1 or coal feeding system No. 2 is discharging material.

[0124] Preferably, since the electronic scale of belt conveyor No. 12 is a certain distance from the coal mixing outlet of belt conveyor No. 11, the control time setting needs to be adjusted according to the time difference between the data collection of the electronic scale of belt conveyor No. 12 and the data collection of the electronic scale of belt conveyor No. 12. Given that the discharge port adjustment is non-linear, the discharge port data of the discharge range should be collected in advance and set in the adjustment accuracy of the electronic scale.

[0125] After completing the above settings, the system will be put into testing. Once the safe and stable operation of the coal conveying system is confirmed, it will be officially put into operation, and the coal mixing method will be selected according to the actual situation for coal mixing and storage.

[0126] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A coal blending and combustion system based on a belt conveyor with vertical process modules, characterized in that, include: The No. 1 coal feeding system is equipped with a 1A discharge port and a 1B discharge port for outputting coal of type A. The No. 2 coal feeding system is equipped with a 2A discharge port and a 2B discharge port for outputting coal type B. The first belt conveyor A is directly opposite the 2A discharge port and the 1A discharge port, and is equipped with an electronic scale 1A located behind the 1A discharge port and an electronic scale 2A located behind the 2A discharge port respectively. The first belt conveyor B is directly opposite the 2B discharge port and the 1B discharge port, and is equipped with an electronic scale 1B located behind the 1B discharge port and an electronic scale 2B located behind the 2B discharge port. A vertical discharge pipe is provided with an inlet at the top and an outlet at the bottom. The inlet is connected to a first belt conveyor A and a first belt conveyor B, and the outlet is connected to a second belt conveyor. The second belt conveyor is used to transport the coal material output from the vertical drop pipe; The third belt conveyor is used to transport the coal output from the second belt conveyor to the coal supply end; The controller is connected to the No. 1 coal feeding system, the No. 2 coal feeding system, the 1A electronic scale, the 2A electronic scale, the 1B electronic scale, and the 2B electronic scale, respectively, and is used to mix coal of type A and coal of type B on the first belt conveyor A, the first belt conveyor B, or the second belt conveyor.

2. The coal blending and combustion system based on a belt conveyor with a vertical process module according to claim 1, characterized in that, The control process for mixing coal of type A and type B on the first belt conveyor A includes the following steps: S101: Start the first conveyor belt A; set the coal blending flow rate for coal type A and coal type B; S102: Start coal feeding system No. 1 and coal feeding system No. 2, open discharge port 1A and discharge port 2A, and release coal to the first belt conveyor A at the same time; S103: Determine whether the flow rate detected by the 2A electronic scale is the same as the coal blending flow rate of coal type B. If not, adjust the discharge rate of the 2A outlet and repeat step S103; otherwise, proceed to step S104. S104: Determine whether the difference between the flow rate detected by electronic scale 1A and the flow rate detected by electronic scale 2A is equal to the coal blending flow rate of coal type A. If not, adjust the discharge rate of outlet 1A and repeat step S104; otherwise, proceed to step S105. S105: Repeat steps S103-S104 until a coal mixing stop command is received.

3. The coal blending and combustion system based on a belt conveyor with a vertical process module according to claim 1, characterized in that, The control process for mixing coal of type A and type B on the first belt conveyor B includes the following steps: S111: Start the first conveyor belt B; set the coal blending flow rate for coal type A and coal type B; S112: Start coal feeding system No. 1 and coal feeding system No. 2, open discharge port 1B and discharge port 2B, and release coal to the first belt conveyor B at the same time; S113: Determine whether the flow rate detected by the 2B electronic scale is the same as the coal blending flow rate of coal type B. If not, adjust the discharge rate of the 2B outlet and repeat step S103; otherwise, proceed to step S104. S114: Determine whether the difference between the flow rate detected by electronic scale 1B and the flow rate detected by electronic scale 2B is equal to the coal blending flow rate of coal type A. If not, adjust the discharge rate of discharge port 1B and repeat step S114; otherwise, proceed to step S115. S115: Repeat steps S113-S114 until a coal mixing stop command is received.

4. The coal blending and combustion system based on a belt conveyor with a vertical process module according to claim 1, characterized in that, The control process for blending coal of type A and type B on the second belt conveyor includes the following steps: S201: Start the belt conveyor of the first belt conveyor A and the belt conveyor of the first belt conveyor B respectively; set the coal blending flow rate of coal type A and coal type B. S202: Start coal feeding system No. 1 and coal feeding system No. 2, open discharge port 1A and discharge port 2B, and release coal to the first belt conveyor A and the first belt conveyor B respectively; S203: The coal from the first belt conveyor A and the first belt conveyor B both fall through the vertical drop pipe onto the second belt conveyor for mixing. S204: Determine whether the flow rate detected by the 1A electronic scale is the same as the coal blending flow rate of coal type A. If not, adjust the discharge rate of the 1A outlet and repeat step S204. Determine whether the flow rate detected by the 2B electronic scale is the same as the coal blending flow rate of coal type B. If not, adjust the discharge rate of the 2B outlet and repeat step S204. S205: Repeat step S204 until a coal mixing stop command is received.

5. A coal blending and combustion system based on a belt conveyor with a vertical process module according to claim 1, characterized in that, The second conveyor belt includes a second conveyor belt A and a second conveyor belt B, which are connected in parallel at the output port of the vertical feed pipe. The third conveyor belt includes a third conveyor belt A and a third conveyor belt B, with the third conveyor belt A connected to the second conveyor belt A and the third conveyor belt B connected to the second conveyor belt B. The third conveyor belt A is equipped with an electronic scale, and the third conveyor belt B is equipped with an electronic scale. The vertical feed pipe is equipped with a baffle and a driver that drives the baffle to rotate, for diverting the coal material flowing into the input port of the vertical feed pipe to the second conveyor belt A and the second conveyor belt B.

6. A coal blending and combustion system based on a belt conveyor with a vertical process module according to claim 5, characterized in that, The control process for blending coal of type A and type B on the second belt conveyor includes the following steps: S301: Start the belt conveyor of the first belt conveyor A and the belt conveyor of the first belt conveyor B respectively; set the coal blending flow rate of coal type A and coal type B. S302: Start coal feeding system No. 1 and coal feeding system No. 2, open discharge port 1A and discharge port 2B, and release coal to first belt conveyor A and first belt conveyor B respectively; S303: Determine whether the flow rate detected by the 1A electronic scale is the same as the coal blending flow rate of coal type A. If not, adjust the discharge rate of the 1A outlet and repeat step S303. Determine whether the flow rate detected by the 2B electronic scale is the same as the coal blending flow rate of coal type B. If not, adjust the discharge rate of the 2B outlet and repeat step S303. S304: Drive the baffle inside the vertical discharge pipe to rotate to the middle position where the flow is split between the second conveyor belt A and the second conveyor belt B by the driver; S305: Determine whether the flow rate detected by the electronic scale of the third conveyor belt A is the same as the average value of the total flow rate of coal type A and coal type B. If not, adjust the angle of the baffle inside the vertical discharge pipe. Determine whether the flow rate detected by the electronic scale of the third conveyor belt B is the same as the average value of the total flow rate of coal type A and coal type B. If not, adjust the angle of the baffle inside the vertical discharge pipe. S306: Repeat steps S303-S305 until a coal mixing stop command is received.

7. A coal blending and combustion system based on a belt conveyor with a vertical process module according to claim 5, characterized in that, The control process for blending coal of type A and type B on the second belt conveyor includes the following steps: S401: Start the belt conveyor of the first belt conveyor A and the belt conveyor of the first belt conveyor B respectively; S402: Start coal feeding system No. 1 and coal feeding system No. 2, open discharge port 1A and discharge port 2B, and release coal to the first belt conveyor A and the first belt conveyor B respectively; S403: The driver drives the baffle inside the vertical feeding pipe to rotate, so that all of the B coal falls into the second belt conveyor A. The A coal is partially mixed with the B coal according to the actual coal blending requirements and falls into the second belt conveyor A; the rest falls into the second belt conveyor B.

8. A coal blending and combustion system based on a belt conveyor with a vertical process module according to claim 5, characterized in that, The vertical discharge tube is also equipped with an angle sensor to measure the rotation angle of the baffle.

9. A coal blending and combustion system based on a belt conveyor with a vertical process module according to claim 5, characterized in that, The bottom of the vertical discharge pipe is also equipped with belt conveyor A and belt conveyor B, which are used to transport coal to the second belt conveyor A and the second belt conveyor B, respectively.

10. A coal blending and combustion system based on a belt conveyor with a vertical process module according to claim 1, characterized in that, During the coal blending control process, the controller also continuously performs the coal supply interruption interlocking protection steps: after detecting that the No. 2 coal feeding system is discharging material, the No. 1 coal feeding system discharges material; when the No. 1 or No. 2 coal feeding system is detected to be cutting off coal, the other coal feeding system stops discharging material. By judging the flow rate value output by the electronic scale set at the discharge port of coal feeding system No. 1 or coal feeding system No. 2, it can be determined whether coal feeding system No. 1 or coal feeding system No. 2 is discharging material.

Images