An on-line coal concentration regulator and method

Abstract

The present application relates to a kind of online coal concentration regulator and method, install in the front end of coal pipe, the coal pipe is equipped with coal concentration detector, including control system, the coal concentration is connected with the signal input end of control system, further include roof, adjusting lever and baffle, the mounting hole for fixed installation of coal pipe front end and the through-hole for passing through baffle are equipped on roof, connector is equipped between adjusting lever and baffle and is connected with adjusting lever and baffle, further include guider, guider is slidably connected with baffle and is fixedly connected with roof, the deflector is equipped on roof, the deflector is slidably connected with baffle;The coal concentration regulator of the present application can make coal concentration difference control at about 5%, can reduce the possibility of upstream coal flow disorder and prevent coal accumulation, the coal quantity of coal pipe is accurately controlled by the opening of baffle;Device structure is simple, safe and reliable.

Description

TECHNICAL FIELD

[0001] The present application relates to a coal concentration regulator, in particular to an on-line coal concentration regulator and a method for regulating coal concentration. BACKGROUND

[0002] When using coal combustion to heat a boiler, the coal is often ground into coal powder by a coal mill, which aims to make it fully burn, reduce the amount of harmful waste gas produced by incomplete combustion and increase energy utilization; when blowing coal powder into a combustion chamber, the concentration difference of coal powder blown from each direction cannot be too large, otherwise it is easy to cause uneven heating, local overheating or insufficient local heat.

[0003] The traditional coal powder regulating device cannot be adjusted on-line in real time, and the optimal control of the concentration difference of coal powder can only reach about 30%; secondly, the traditional coal powder regulating device is easy to cause coal powder accumulation. SUMMARY

[0004] The present application is completely different from the design principle and the regulation method of the concentration of coal powder of the traditional coal powder regulating device. The present application not only can automatically regulate the concentration of coal powder in each pipeline on-line in real time to balance the concentration of coal powder in each pipeline, but also can balance the concentration of coal powder in each pipeline when the amount of coal powder changes caused by the change of the load of the unit, thereby balancing the concentration of coal powder in each pipeline.

[0005] The purpose of the present application is achieved by the following technical scheme: an on-line coal concentration regulator is installed at the front end of a coal pipe, a coal concentration detector and a control system are arranged in the coal pipe, the output of the coal concentration detector is electrically connected with the signal input end of the control system, and the on-line coal concentration regulator further comprises a top plate, an adjusting rod, a guide and a coal blocking plate; wherein:

[0006] An installation hole for fixedly installing the front end of the coal pipe and a through hole for passing through the coal blocking plate are arranged on the top plate; a connector is arranged between the adjusting rod and the coal blocking plate, and the connector is movably connected with the adjusting rod and the coal blocking plate at two ends thereof; the guide is slidably connected with the coal blocking plate, and the guide is fixedly connected with the top plate; a flow guide plate is arranged on the top plate, and the flow guide plate is slidably connected with the coal blocking plate.

[0007] Preferably, one end of the connector is provided with a sliding shaft, one end of the adjusting rod is provided with a shaft hole, and the shaft hole is slidably connected with the sliding shaft; one end of the coal blocking plate is movably connected with the connector in a hinged manner.

[0008] Preferably, the coal blocking plate is provided with a coal blocking groove; and the coal blocking plate is installed in an inclined manner.

[0009] Preferably, the guide comprises two guide wheels and a support rod, the wheel shafts of the guide wheels are fixedly connected with one end of the support rod, the other end of the support rod is fixedly connected with one side of the top plate; the baffle is arranged between the two guide wheels, and the guide wheels and the baffle are movably connected.

[0010] Preferably, the guide plate is provided with a guide groove; one end of the guide plate is movably connected with the other side of the top plate through a hinge.

[0011] Preferably, the device further comprises an electric actuator, an output shaft of the electric actuator is fixedly connected with the other end of the adjusting rod; the electric actuator is electrically connected with the output end of the control system.

[0012] A method for adjusting the concentration of coal powder in an online coal powder concentration regulator, comprising the following steps:

[0013] S11: when the coal powder amount entering the coal powder pipe needs to be reduced, the control system controls the electric actuator of the regulator installed at the front end of the coal powder pipe, so that the adjusting rod moves with the connector towards the top plate, the connector moves along the sliding shaft with a small displacement, so that the baffle moves along the guide smoothly and the opening degree is increased, thereby increasing the area of the baffle that can block the coal powder, and reducing the amount of coal powder entering the coal powder pipe;

[0014] S12: when the coal powder amount entering the coal powder pipe needs to be increased, the control system controls the electric actuator of the regulator installed at the front end of the coal powder pipe, so that the adjusting rod moves with the connector away from the top plate, the connector moves along the sliding shaft with a small displacement, so that the baffle moves along the guide smoothly and the opening degree is reduced, thereby reducing the area of the baffle that can block the coal powder, and increasing the amount of coal powder entering the coal powder pipe;

[0015] S2: the coal powder concentration detector in each coal powder pipe transmits the detected coal powder concentration data into the control system, and the control system determines the coal powder concentration difference between the maximum coal powder concentration and the minimum coal powder concentration among the coal powder pipes and compares it with the set concentration difference value;

[0016] S21: if the coal powder concentration difference is lower than the set concentration difference value, the working condition is in a normal state; if the coal powder concentration difference is higher than the set concentration difference value, the working condition is in an abnormal state;

[0017] S211: when the abnormal state working condition described in S21 step occurs, first, it is judged whether the regulator installed in the coal powder pipe with the minimum coal powder concentration is completely opened or closed: if the opening degree of the baffle of the regulator is not 0, the opening degree of the baffle of the regulator is adjusted to reduce the opening degree, i.e. to increase the coal powder concentration in the pipe, and at the same time, the coal powder concentrations in all the pipes are judged; if the coal powder concentration in the pipe is still the minimum, the regulator is continuously adjusted until the opening degree is 0.

[0018] S212: When the minimum pulverized coal concentration of the pulverized coal pipe opening degree of S211 is 0, and the pulverized coal concentration difference is higher than the set concentration difference, the pulverized coal pipe with the maximum pulverized coal concentration is adjusted to reduce the amount of pulverized coal entering the pulverized coal pipe in step S11. In the process of adjusting the pulverized coal concentration, the control system is always judging whether the difference between the maximum concentration and the minimum concentration of the pulverized coal concentration is lower than the set value. If the difference is greater than the set value, the adjustment is continued. At the same time, the control system is also judging whether the maximum concentration of the pulverized coal pipe has changed. If the maximum concentration of the pulverized coal pipe has changed, the control system instructs to stop adjusting the original maximum concentration regulator and start adjusting the maximum concentration of the pulverized coal pipe.

[0019] The present application has the following advantages:

[0020] 1. The pulverized coal concentration regulator of the present application can control the pulverized coal concentration difference to about 5%;

[0021] 2. The pulverized coal concentration regulator of the present application not only can automatically adjust the pulverized coal concentration in each pipe in real time online, but also can balance the pulverized coal concentration in each pipe. At the same time, it can ensure that the change of the pulverized coal amount caused by the change of the unit load can balance the pulverized coal concentration in each pipe.

[0022] 3. Along the direction of the pulverized coal flow, the blocked pulverized coal in the upstream passes through the guide plate to bypass the rear pulverized coal pipe and smoothly enter the downstream. This not only reduces the concentration of the pulverized coal entering the rear maximum pulverized coal pipe, but also increases the concentration of the pulverized coal in other pipes, thereby increasing the adjustability of the regulator.

[0023] 4. The installation of the baffle and the direction of the pulverized coal flow is inclined, which is conducive to transporting the blocked pulverized coal to the guide plate and then smoothly transporting these pulverized coal to the downstream through the guide plate. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a structure full opening diagram of an online pulverized coal concentration regulator;

[0025] Figure 2 It is a structure 0 opening diagram of an online pulverized coal concentration regulator;

[0026] Figure 3 It is an installation diagram of the present application;

[0027] In the figure: 1 - adjustment rod; 2 - sliding shaft; 3 - guide; 4 - guide plate; 5 - baffle; 6 - top plate; 7 - connector; 8 - pulverized coal pipe. DETAILED DESCRIPTION

[0028] The present application will be further described below in conjunction with the drawings, but the protection scope of the present application is not limited to the following description.

[0029] As shown in Figure 1 , Figure 2 and Figure 3 , an online coal concentration regulator is installed at the front end of a coal pipe 8, the coal pipe 8 is provided with a coal concentration detector and a control system, the output of the coal concentration detector is electrically connected with the signal input end of the control system, and the regulator further comprises a top plate 6, an adjusting rod 1, a guide 3 and a coal blocking plate 5, wherein:

[0030] The top plate 6 is provided with a mounting hole for fixedly mounting the front end of the coal pipe 8 and a through hole for passing through the coal blocking plate 5; a connector 7 is arranged between the adjusting rod 1 and the coal blocking plate 5, and the connector 7 is movably connected with the adjusting rod 1 and the coal blocking plate 5 at two ends thereof; the guide 3 is slidably connected with the coal blocking plate 5, and the guide 3 is fixedly connected with the top plate 6; the top plate 6 is provided with a flow guide plate 4, and the flow guide plate 4 is slidably connected with the coal blocking plate 5, so that the coal blocked upstream can smoothly enter downstream through the flow guide plate 4.

[0031] Preferably, one end of the connector 7 is provided with a sliding shaft 2, the axis direction of the sliding shaft 2 is perpendicular to the movement direction of the adjusting rod 1; one end of the adjusting rod 1 is provided with a shaft hole, the shaft hole is slidably connected with the sliding shaft 2; and one end of the coal blocking plate 5 is movably connected with the connector 7 in a hinged manner.

[0032] Preferably, the coal blocking plate 5 is provided with a coal blocking groove; and the coal blocking plate 5 is installed in an inclined manner.

[0033] Preferably, the guide 3 comprises two guide wheels and a support rod, the wheel shaft of the guide wheel is fixedly connected with one end of the support rod, and the other end of the support rod is fixedly connected with one side of the top plate 6; the coal blocking plate 5 is arranged between the two guide wheels, and the guide wheels are movably connected with the coal blocking plate 5.

[0034] Preferably, the flow guide plate 4 is provided with a flow guide groove; one end of the flow guide plate 4 is movably connected with the other side of the top plate 6 through a hinge, and the flow guide plate 4 is always attached to the coal blocking plate 5.

[0035] Preferably, the regulator further comprises an electric actuator, an output shaft of the electric actuator is fixedly connected with the other end of the adjusting rod 1, and the electric actuator is electrically connected with the output end of the control system.

[0036] Preferably, according to actual working conditions, four coal pipes 8 are provided, and each of the coal pipes 8 is provided with the coal concentration regulator.

[0037] A method for regulating coal concentration by using an online coal concentration regulator comprises the following steps:

[0038] S11: when it is needed to reduce the coal feeding amount of the coal pipe 8, the adjusting rod 1 is rotated to a position where the coal blocking plate 5 is located, so that the coal blocking plate 5 is moved to the position where the coal pipe 8 is located, thereby blocking the coal pipe 8.Figure 1 As shown, the control system controls the electric actuator of the governor installed at the front end of the pulverized coal pipe 8 to move the adjusting rod 1 with the connector 7 towards the direction away from the top plate 6, and the connector 7 moves along the sliding shaft 2 with a small displacement, so that the baffle 5 moves along the guide 3 smoothly and the opening degree is reduced, thereby reducing the area of the baffle 5 that can block the pulverized coal and increasing the amount of the pulverized coal entering the pulverized coal pipe 8;

[0039] S12: When it is needed to increase the amount of the pulverized coal entering the pulverized coal pipe 8, such as Figure 2 As shown, the control system controls the electric actuator of the governor installed at the front end of the pulverized coal pipe 8 to move the adjusting rod 1 with the connector 7 towards the direction away from the top plate 6, and the connector 7 moves along the sliding shaft 2 with a small displacement, so that the baffle 5 moves along the guide 3 smoothly and the opening degree is reduced, thereby reducing the area of the baffle 5 that can block the pulverized coal and increasing the amount of the pulverized coal entering the pulverized coal pipe 8;

[0040] S2: The pulverized coal concentration detector in each pulverized coal pipe 8 transmits the detected pulverized coal concentration data into the control system, and the control system determines the pulverized coal concentration difference between the maximum pulverized coal concentration and the minimum pulverized coal concentration among the pulverized coal pipes 8 and compares it with the set concentration difference value;

[0041] S21: If the pulverized coal concentration difference is lower than the set concentration difference value, the working condition is in the normal state; if the pulverized coal concentration difference is higher than the set concentration difference value, the working condition is in the abnormal state;

[0042] S211: When the abnormal state working condition described in S21 occurs, first, it is determined whether the governor installed in the pulverized coal pipe 8 with the minimum pulverized coal concentration is fully opened: if the opening degree of the baffle 5 of the governor is not 0, the opening degree of the baffle 5 of the governor is adjusted to reduce the opening degree, that is, to increase the pulverized coal concentration in the pipe, and at the same time, the pulverized coal concentrations in all the pipes are determined, and if the pulverized coal concentration in the pipe is still the minimum, the governor is continuously adjusted until the opening degree is 0;

[0043] S212: When the opening degree of the pulverized coal pipe 8 with the minimum pulverized coal concentration described in S211 is 0, and the pulverized coal concentration difference is higher than the set concentration difference value, the pulverized coal pipe with the maximum pulverized coal concentration is adjusted to reduce the amount of the pulverized coal entering the pulverized coal pipe 8 as described in S11. In the process of adjusting the pulverized coal concentration, the control system always determines whether the pulverized coal concentration difference between the maximum concentration and the minimum concentration is lower than the set value, and if the difference is greater than the set value, the adjustment is continued. At the same time, the control system also determines whether the pulverized coal pipe 8 with the maximum concentration has changed, and if the pulverized coal pipe 8 with the maximum concentration has changed, the control system instructs to stop adjusting the governor of the original maximum concentration and to start adjusting the governor of the current maximum concentration.

Claims

1. An online pulverized coal concentration regulator, installed at the front end of a pulverized coal pipe (8), wherein a pulverized coal concentration detector and a control system are provided in the pulverized coal pipe (8), wherein the output of the pulverized coal concentration detector is electrically connected to the signal input end of the control system, and wherein: It also includes a top plate (6), an adjusting rod (1), a guide (3) and a powder baffle (5); wherein: the top plate (6) is provided with a mounting hole for fixing the front end of the pulverized coal pipe (8) and a through hole for passing the powder baffle (5); a connector (7) is provided between the adjusting rod (1) and the powder baffle (5), and the two ends of the connector (7) are movably connected to the adjusting rod (1) and the powder baffle (5) respectively; the guide (3) is slidably connected to the powder baffle (5), and the guide (3) is fixedly connected to the top plate (6). ; A guide plate (4) is provided on the top plate (6), and the guide plate (4) is slidably connected to the powder baffle (5); the guide (3) includes two guide wheels and a support rod, the wheel axle of the guide wheel is fixedly connected to one end of the support rod, and the other end of the support rod is fixedly connected to one side of the top plate (6); the powder baffle (5) is placed between the two guide wheels, and the guide wheel is movably connected to the powder baffle (5); a guide groove is provided on the guide plate (4); one end of the guide plate (4) is movably connected to the other side of the top plate (6) through a hinge; One end of the connector (7) is provided with a sliding shaft (2), and one end of the adjustment rod (1) is provided with an axis hole, and the axis hole is slidably connected to the sliding shaft (2); one end of the powder blocking plate (5) is movably connected to the connector (7) in a hinged manner; It also includes an electric actuator, the output shaft of which is fixedly connected to the other end of the regulating rod (1); the electric actuator is electrically connected to the output end of the control system; When the amount of coal fed into the pulverized coal pipe (8) needs to be reduced, the control system controls the electric actuator of the regulator installed at the front end of the pulverized coal pipe (8), so that the regulating rod (1) moves with the connector (7) toward the top plate (6), and the connector (7) moves with a small displacement along the sliding shaft (2), so that the powder blocking plate (5) moves smoothly along the guide (3) and increases the opening, thereby increasing the area of ​​the pulverized coal that can be blocked by the powder blocking plate (5) and reducing the amount of pulverized coal entering the pulverized coal pipe (8); When the amount of coal fed into the pulverized coal pipe (8) needs to be increased, the control system controls the electric actuator of the regulator installed at the front end of the pulverized coal pipe (8), so that the regulating rod (1) moves with the connector (7) in a direction away from the top plate (6), and the connector (7) moves with a small displacement along the sliding shaft (2), so that the powder baffle (5) moves smoothly along the guide (3) and reduces the opening, thereby reducing the area of ​​the pulverized coal that can be blocked by the powder baffle (5) and increasing the amount of pulverized coal entering the pulverized coal pipe (8); The method for adjusting the coal powder concentration by using an online coal powder concentration regulator comprises the following steps: S2: the coal powder concentration detector in each coal powder pipe (8) transmits the detected coal powder concentration data to the control system, and the control system determines the coal powder concentration difference between the maximum coal powder concentration and the minimum coal powder concentration between each coal powder pipe (8) and compares it with the set concentration difference value; S21: if the coal powder concentration difference is lower than the set concentration difference value, the working condition is in a normal state; if the coal powder concentration difference is higher than the set concentration difference value, the working condition is in an abnormal state; S211: when the abnormal working condition described in step S21 occurs, first, it is determined whether the regulator installed on the coal powder pipe (8) with the minimum coal powder concentration is fully opened: if the opening of the powder baffle (5) of the regulator is not 0, the regulator is adjusted to reduce the opening of the powder baffle (5), that is, to increase the opening of the pipe. The pulverized coal concentration is determined, and the pulverized coal concentration in each pipeline is determined at the same time. If the pulverized coal concentration in this pipeline is still the minimum, the regulator is continuously adjusted until the opening is 0. S212: When the opening of the pulverized coal pipe (8) with the minimum pulverized coal concentration described in S211 is 0, and the pulverized coal concentration difference is higher than the set concentration difference, the amount of pulverized coal entering the pulverized coal pipe (8) of the pipeline with the largest pulverized coal concentration is reduced. In the process of adjusting the pulverized coal concentration, the control system is always determining whether the difference between the maximum concentration and the minimum concentration is lower than the set value. If the difference is greater than the set value, the adjustment is continued. At the same time, the control system is also determining whether the pulverized coal pipe (8) with the maximum concentration has changed. If the pulverized coal pipe (8) with the maximum concentration has changed, the control system instructs to stop adjusting the regulator of the original maximum concentration and start adjusting the pulverized coal pipe (8) with the current maximum concentration.

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