A kind of anti-blocking device and anti-blocking system for coal pipe

Abstract

The embodiment of the present disclosure provides a kind of anti-blocking device and anti-blocking system for coal pipe, the anti-blocking device includes S-shaped bitube assembly, negative pressure side air inlet pipe, negative pressure side regulating valve, negative pressure side flowmeter, positive pressure side air inlet pipe, positive pressure side regulating valve, positive pressure side flowmeter and controller;The first end of S-shaped bitube assembly is inserted into coal pipe, the first end of negative pressure side air inlet pipe and positive pressure side air inlet pipe is used to receive compressed air, and the second end of the two is communicated with the second end of S-shaped bitube assembly on negative pressure side and positive pressure side respectively;Negative pressure side air inlet pipe is connected with negative pressure side regulating valve and negative pressure side flowmeter, and both are electrically connected to controller;Positive pressure side air inlet pipe is connected with positive pressure side regulating valve and positive pressure side flowmeter, and both are electrically connected to controller.The equal and constant flow of compressed air is kept on positive pressure side and negative pressure side finally, and the constant airflow is discharged, which is not blocked by dust in coal pipe.

Description

Technical Field

[0001] The embodiments disclosed herein belong to the field of coal powder pipe anti-clogging technology, specifically relating to an anti-clogging device and anti-clogging system for coal powder pipes. Background Technology

[0002] In thermal power plants, to rationally adjust the coal-air ratio in the pulverizer, improve boiler automation rates, ensure proper boiler air distribution, and enhance combustion stability and efficiency, it is essential to accurately and stably measure the air velocity, air volume, and pulverizing ventilation volume within the primary and secondary air ducts of the boiler over a long period. Since both primary and secondary air, as well as pulverizing air, contain varying degrees of dust, there are currently two main types of measuring devices for primary and secondary air: differential pressure flow meters and thermal mass flow meters. Differential pressure flow meters are based on Bernoulli's equation and the fluid continuity equation. According to the throttling principle, when fluid flows through a throttling device (such as a standard orifice plate, standard nozzle, long-diameter nozzle, classic Venturi nozzle, etc.), a pressure difference is generated before and after it. This pressure difference is proportional to the square of the flow rate. Differential pressure flow meters are extremely prone to clogging during measurement, while thermal mass flow meters are expensive and easily wear down during measurement, especially in pulverizing systems where clogging and wear are exacerbated. This results in the inability of coal powder conveying pipe air volume measuring devices to operate normally for extended periods, posing a significant challenge to long-term stable operation. Summary of the Invention

[0003] The embodiments disclosed herein are intended to at least address one of the technical problems existing in the prior art, and to provide an anti-clogging device and anti-clogging system for pulverized coal pipes.

[0004] On one hand, embodiments of this disclosure provide an anti-clogging device for a pulverized coal pipe, the anti-clogging device comprising an S-type bit tube assembly, a negative pressure side air inlet pipe, a negative pressure side regulating valve, a negative pressure side flow meter, a positive pressure side air inlet pipe, a positive pressure side regulating valve, a positive pressure side flow meter, and a controller;

[0005] The first end of the S-shaped pressure tube assembly is inserted into the pulverized coal pipe, and the first end of the S-shaped pressure tube assembly is respectively provided with a negative pressure side pressure transmission port and a positive pressure side pressure transmission port; the negative pressure side pressure transmission port faces away from the airflow direction in the pulverized coal pipe, and the positive pressure side pressure transmission port faces the airflow direction in the pulverized coal pipe.

[0006] The first ends of both the negative pressure side air inlet pipe and the positive pressure side air inlet pipe are used to receive compressed air. The second end of the negative pressure side air inlet pipe is connected to the negative pressure side of the second end of the S-type bit tube assembly, and the second end of the positive pressure side air inlet pipe is connected to the positive pressure side of the second end of the S-type bit tube assembly.

[0007] The negative pressure side air inlet pipe is connected in series with the negative pressure side regulating valve and the negative pressure side flow meter from its first end to its second end. Both the negative pressure side regulating valve and the negative pressure side flow meter are electrically connected to the controller.

[0008] The positive pressure side air inlet pipe is connected in series with the positive pressure side regulating valve and the positive pressure side flow meter from its first end to its second end. Both the positive pressure side regulating valve and the positive pressure side flow meter are electrically connected to the controller.

[0009] Optionally, the anti-blocking device further includes a negative pressure side pressure transmission pipe, a positive pressure side pressure transmission pipe, and a differential pressure transmitter;

[0010] The first end of the negative pressure side pressure transmission tube is connected to the second end of the S-type bit tube assembly on the negative pressure side, and the second end of the negative pressure side pressure transmission tube is connected to the differential pressure transmitter.

[0011] The first end of the positive pressure side pressure transmission tube is connected to the second end of the S-type bit tube assembly on the positive pressure side, and the second end of the positive pressure side pressure transmission tube is connected to the differential pressure transmitter.

[0012] Optionally, the S-type comparator assembly includes an S-type comparator, a negative pressure side calibration tube, a negative pressure side calibration valve, a positive pressure side calibration tube, and a positive pressure side calibration valve;

[0013] The first end of the S-shaped pressure tube is inserted into the pulverized coal pipe, and the first end of the S-shaped pressure tube is respectively provided with the negative pressure side pressure transmission port and the positive pressure side pressure transmission port.

[0014] The first end of the negative pressure side calibration tube is connected to the second end of the S-type bit tube on the negative pressure side, and the second end of the negative pressure side calibration tube is provided with the negative pressure side calibration valve; the first end of the positive pressure side calibration tube is connected to the second end of the S-type bit tube on the positive pressure side, and the second end of the positive pressure side calibration tube is provided with the positive pressure side calibration valve.

[0015] Optionally, the S-shaped bipod is made of ceramic.

[0016] On the other hand, embodiments of this disclosure provide a pulverized coal pipe anti-clogging system, which includes a pulverized coal pipe and a fixing component, and employs the anti-clogging device described above;

[0017] The side wall of the pulverized coal pipe is provided with a connecting through hole, and the fixing component is sealed and connected to the connecting through hole; the first end of the S-shaped tube assembly passes through the fixing component, and its second end is located outside the fixing component.

[0018] Optionally, the fixing assembly includes a tube seat and a cover plate;

[0019] The tube seat is sealed to the connecting through hole, and the cover plate is sealed to the tube seat; the central area of ​​the cover plate has a through hole for sealing the passage of the S-shaped tube assembly.

[0020] Optionally, when the S-type compressive tube assembly includes an S-type compressive tube, a negative pressure side calibration tube, a negative pressure side calibration valve, a positive pressure side calibration tube, and a positive pressure side calibration valve, the pulverized coal pipe anti-clogging system further includes a micromanometer;

[0021] The negative pressure port of the micromanometer is connected to the negative pressure side calibration valve, and the positive pressure port of the micromanometer is connected to the positive pressure side calibration valve.

[0022] Optionally, the cover plate is made of stainless steel.

[0023] The anti-clogging device and anti-clogging system for pulverized coal pipes disclosed herein control the compressed air to maintain a constant flow rate at the same speed and amount on both the positive and negative pressure sides, ultimately flowing to the pressure transmission ports on the positive and negative pressure sides. This ensures a continuous and constant airflow from the pressure transmission ports on both sides, preventing them from being blocked by dust inside the pulverized coal pipe. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a pulverized coal pipe anti-clogging system according to an embodiment of the present disclosure. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solutions of this disclosure, the disclosure will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] like Figure 1 As shown, an anti-clogging device for a pulverized coal pipe includes an S-shaped pressure tube assembly, a negative pressure side inlet pipe 110, a negative pressure side regulating valve 111, a negative pressure side flow meter 112, a positive pressure side inlet pipe 120, a positive pressure side regulating valve 121, a positive pressure side flow meter 122, and a controller 130. The first end of the S-shaped pressure tube assembly is inserted into the pulverized coal pipe, and the first end of the S-shaped pressure tube assembly is respectively provided with a negative pressure side pressure transmission port 200 and a positive pressure side pressure transmission port 300. The negative pressure side pressure transmission port 200 faces away from the airflow direction inside the pulverized coal pipe, and the positive pressure side pressure transmission port 300 faces the airflow direction inside the pulverized coal pipe.

[0027] The first ends of both the negative pressure side air inlet pipe 110 and the positive pressure side air inlet pipe 120 are used to receive compressed air. The second end of the negative pressure side air inlet pipe 110 is connected to the negative pressure side of the second end of the S-type specific tube assembly, and the second end of the positive pressure side air inlet pipe 120 is connected to the positive pressure side of the second end of the S-type specific tube assembly. A negative pressure side regulating valve 111 and a negative pressure side flow meter 112 are connected in series from the first end to the second end of the negative pressure side air inlet pipe 110, and both are electrically connected to the controller 130. Similarly, a positive pressure side regulating valve 121 and a positive pressure side flow meter 122 are connected in series from the first end to the second end of the positive pressure side air inlet pipe 120, and both are electrically connected to the controller 130.

[0028] Specifically, such as Figure 1 As shown, in the anti-clogging device of this embodiment, during operation, the negative pressure side pressure transmission port 200 of the first end of the S-type pressure manifold assembly faces away from the airflow direction, and the positive pressure side pressure transmission port 300 faces the airflow direction. Compressed air flows into the first ends of the negative pressure side inlet pipe 110 and the positive pressure side inlet pipe 120 simultaneously, and then flows to the negative pressure side regulating valve 111 and the positive pressure side regulating valve 121 respectively, and then flows through the connecting section 113 of the negative pressure side inlet pipe 110 and the connecting section 123 of the positive pressure side inlet pipe 120 to the negative pressure side flow meter 112 and the positive pressure side flow meter 122 respectively.

[0029] Meanwhile, the negative pressure side pressure transmission port 200 and the positive pressure side pressure transmission port 300 located in the pulverized coal pipe are affected by the gas flow direction in the pulverized coal pipe, which makes the resistance of the negative pressure side pressure transmission port 200 and the positive pressure side pressure transmission port 300 inconsistent (usually the resistance of the positive pressure side pressure transmission port is greater than that of the negative pressure side pressure transmission port), resulting in inconsistent flow rates of the negative pressure side flow meter 112 and the positive pressure side flow meter 122. The negative pressure side flow meter 112 and the positive pressure side flow meter 122 transmit flow signals to the controller 130 through the first connection line 400 and the second connection line 500, respectively. The controller 130 then sends instructions to the negative pressure side regulating valve 111 and the positive pressure side regulating valve 121 through the third connection line 600 and the fourth connection line 700, respectively, to change the appropriate opening degree of the negative pressure side regulating valve 111 and the positive pressure side regulating valve 121, overcome the resistance of the positive pressure side pressure transmission port 300, and achieve equal flow rates through the negative pressure side air inlet pipe 110 and the positive pressure side air inlet pipe 120 to the negative pressure side pressure transmission port 200 and the positive pressure side pressure transmission port 300, and equal flow readings of the negative pressure side flow meter 112 and the positive pressure side flow meter 122. Furthermore, by controlling the compressed air to maintain a constant flow rate at the same speed and quantity on both the positive and negative pressure sides, the compressed air eventually flows to the pressure transmission ports on both sides, ensuring a continuous and constant airflow from the pressure transmission ports on both sides, thus preventing blockage by dust inside the pipe.

[0030] It is easy to understand that the negative pressure side regulating valve 111 and the negative pressure side flow meter 112 can be electrically connected to the controller via a connecting line or wirelessly. Similarly, the positive pressure side regulating valve 121 and the positive pressure side flow meter 122 can be electrically connected to the controller via a connecting line or wirelessly. The embodiments disclosed herein do not impose specific limitations in this regard. The regulating valve can be configured as an automatic regulating valve, and the flow meter can be configured as an electronic flow meter.

[0031] The anti-clogging device and system for pulverized coal pipes disclosed herein operate on the principle of effectively utilizing continuous purge air as the medium to transmit pressure. By overcoming the pressure difference between the positive and negative pressure transmission ports at the first end of the S-shaped bituminous tube assembly within the pulverized coal pipe, the purge air flowing into the positive and negative pressure transmission ports at the first end of the S-shaped bituminous tube assembly is equal in volume and constant in speed, meeting the requirement for continuous online measurement around the clock. By overcoming the different pressures generated by the airflow direction inside the pulverized coal pipe on the negative and positive pressure transmission ports, the resistance of the purge air entering the negative and positive pressure transmission ports is affected. Furthermore, the controller automatically coordinates the resistance on the positive and negative pressure sides to equalize and stabilize the flow rate, achieving the purpose of stable test airflow.

[0032] For example, such as Figure 1 As shown, the anti-clogging device further includes a negative pressure side pressure transmission pipe 140, a positive pressure side pressure transmission pipe 141, and a differential pressure transmitter 142. The first end of the negative pressure side pressure transmission pipe 140 is connected to the second end of the S-type bituminous tube assembly (negative pressure side), and the second end of the negative pressure side pressure transmission pipe 140 is connected to the differential pressure transmitter 142. The first end of the positive pressure side pressure transmission pipe 141 is connected to the second end of the S-type bituminous tube assembly (positive pressure side), and the second end of the positive pressure side pressure transmission pipe 141 is connected to the differential pressure transmitter 142.

[0033] Specifically, such as Figure 1 As shown, the airflow exiting from the positive pressure side pressure transmission port 300 of the S-type bituminous tube assembly is affected by the airflow direction inside the pulverized coal pipe, resulting in greater resistance than the negative pressure side pressure transmission port. Therefore, the differential pressure between the positive and negative pressure transmission points can be measured at the differential pressure transmitter 142. Furthermore, the controller 130 controls the opening of the positive and negative pressure side regulating valves, and simultaneously, under the feedback from the positive and negative pressure side flow meters, controls the compressed air in the inlet pipe to enter the positive and negative pressure side regulating valves and flow meters sequentially at a constant speed and in equal quantities, and then flow into the S-type bituminous tube assembly. The different resistances experienced at the positive and negative pressure transmission ports of the S-type bituminous tube assembly transmit the pressure to the differential pressure transmitter. The positive pressure port 300 facing the airflow and the negative pressure port 200 facing away from the airflow of the S-type pressure tube component simultaneously overcome different resistances, so that the airflow output here is still equal and constant in speed and quantity. The continuous airflow flows out from here, so that the dust in the pulverized coal pipeline cannot enter the S-type pressure tube component and cause blockage.

[0034] The anti-clogging device for pulverized coal pipes disclosed in this invention is designed to control two equal-flow-rate, equal-volume streams of compressed air to flow simultaneously into the positive and negative pressure transmission ports of an S-type bituminous tube assembly. Even if the resistance at one of the positive and negative pressure transmission ports faces the airflow direction differently than the other, the compressed air flowing out of the positive and negative pressure transmission ports simultaneously remains constant and equal, preventing dust from entering the pulverized coal pipe. Because the resistance overcome at the positive and negative pressure transmission ports is different, the pressure at the positive and negative pressure transmission ports is also different, and this pressure is transmitted to the differential pressure transmitter through the S-type bituminous tube assembly and the connected pipeline. This effectively solves the problem of dust blockage, directly measures the differential pressure of the airflow in the pulverized coal pipe, and greatly improves the continuity and reliability of online measurement.

[0035] For example, such as Figure 1 As shown, the S-type pressure gauge assembly includes an S-type pressure gauge 150, a negative pressure side calibration pipe 151, a negative pressure side calibration valve 152, a positive pressure side calibration pipe 153, and a positive pressure side calibration valve 154. The first end of the S-type pressure gauge 150 is inserted into the pulverized coal pipe, and the first end of the S-type pressure gauge 150 is respectively provided with a negative pressure side pressure transmission port 200 and a positive pressure side pressure transmission port 300. The first end of the negative pressure side calibration pipe 151 is connected to the negative pressure side of the second end of the S-type pressure gauge 150, and the second end of the negative pressure side calibration pipe 151 is provided with the negative pressure side calibration valve 152. The first end of the positive pressure side calibration pipe 153 is connected to the positive pressure side of the second end of the S-type pressure gauge 150, and the second end of the positive pressure side calibration pipe 153 is provided with the positive pressure side calibration valve 154.

[0036] Specifically, such as Figure 1 As shown, the positive pressure side calibration valve 154 and the negative pressure side calibration valve 152 are used for calibration and maintenance. They are normally closed and only opened during use. In use, a micromanometer is connected to the positive pressure side calibration valve 154 and the negative pressure side calibration valve 152 respectively. The valves are then opened, and the micromanometer readings are used to calibrate the accuracy of the differential pressure transmitter 142. As a specific example, the S-type bituminous tube 150 can be made of ceramic.

[0037] On the other hand, such as Figure 1 As shown, embodiments of this disclosure provide a pulverized coal pipe anti-clogging system. The system includes a pulverized coal pipe and a fixing component, and employs the anti-clogging device described above. The specific structure of the anti-clogging device can be found in the preceding description and will not be elaborated further here. A connecting through-hole is provided on the side wall of the pulverized coal pipe, and the fixing component is sealed and connected to this connecting through-hole. The first end of the S-shaped bituminous tube component passes through the fixing component, and its second end is located outside the fixing component.

[0038] Furthermore, the fixing assembly includes a tube seat 160 and a cover plate 161. The tube seat 160 is sealed to the connecting through hole, and the cover plate 161 is sealed to the tube seat 160. The cover plate 161 has a through hole in its central region, which is used to seal the passage of the S-shaped tube assembly.

[0039] Specifically, such as Figure 1 As shown, as an example, the pipe seat 160 and the pulverized coal pipe can be made of the same type of material. The pipe seat 160 is installed with a sealing through-hole on the side wall of the vertical section of the pulverized coal pipe, used to fix the cover plate 161 and the S-type tube 150. The cover plate 161 can be made of stainless steel and is screwed onto the pipe seat 160 for sealing; its central through-hole is used to fix the S-type tube 150.

[0040] Furthermore, when the S-type pressure manifold assembly includes an S-type pressure manifold 150, a negative pressure side calibration pipe 151, a negative pressure side calibration valve 152, a positive pressure side calibration pipe 153, and a positive pressure side calibration valve 154, the pulverized coal pipe anti-clogging system also includes a micromanometer (not shown in the figure). The negative pressure interface of the micromanometer is connected to the negative pressure side calibration valve 152, and the positive pressure interface of the micromanometer is connected to the positive pressure side calibration valve 154.

[0041] Specifically, such as Figure 1 As shown, before use, first tighten the cover plate 161 onto the pipe seat 160. Insert the S-type pressure tube 150 into the hole in the center of the cover plate 161 so that the positive pressure side pressure transmission port 300 faces the airflow direction and the negative pressure side pressure transmission port faces away from the airflow direction. Weld them together to ensure a seal. When two streams of compressed air flow into the two inlet pipes simultaneously, they flow to the positive pressure side regulating valve 121 and the negative pressure side regulating valve 111 respectively, and then to the positive pressure side flow meter 122 and the negative pressure side flow meter 112 respectively. At this time, the positive pressure side pressure transmission port 300 and the negative pressure side pressure transmission port 200 in the pulverized coal pipe are affected by the gas flow direction in the pipe, causing the resistance of the positive pressure side pressure transmission port 300 and the negative pressure side pressure transmission port 200 to be inconsistent. This results in inconsistent flow rates between the positive pressure side flow meter 122 and the negative pressure side flow meter 112. Simultaneously, signals are transmitted to the controller 130, which then sends instructions to the positive and negative pressure side regulating valves respectively, changing the appropriate opening degree of the positive and negative pressure side regulating valves to overcome the resistance of the positive pressure side pressure transmission port, thereby achieving equal flow rates to the positive and negative pressure side pressure transmission points, and equal flow readings of the positive and negative pressure side electronic flow meters. This effectively solves the problem of dust blockage.

[0042] Meanwhile, pressure information is transmitted to the differential pressure transmitter 142 through the positive pressure side pressure transmission pipe 141 and the negative pressure side pressure transmission pipe 140 to measure the differential pressure in the pulverized coal pipe. Additionally, the positive pressure side calibration valve 154 and the negative pressure side calibration valve 152 serve as calibration and maintenance points. During use, a micromanometer is connected to the positive pressure side calibration valve 154 and the negative pressure side calibration valve 152 respectively. Then, the valves are opened, and the readings of the micromanometers are used to calibrate the accuracy of the differential pressure transmitter 142, greatly improving the continuity and reliability of online measurement.

[0043] Based on the above, the main components of the pulverized coal pipe anti-clogging system are explained in detail below:

[0044] The positive pressure side air inlet pipe 120 and the negative pressure side air inlet pipe 110 are connected to compressed air and are distributed on the positive and negative sides respectively. The positive and negative sides are connected to the positive pressure side regulating valve 121 and the negative pressure side regulating valve 111 respectively. The compressed air introduced is used as the purging air at the positive pressure side pressure transmission port 300 and the negative pressure side pressure transmission port 200 respectively, so that the positive pressure side pressure transmission port 300 and the negative pressure side pressure transmission port 200 will not be blocked in the pulverized coal pipe for a long time. At the same time, the compressed air also serves as a medium for transmitting pressure.

[0045] During the operation of controller 130, the control of the positive and negative pressure sides must be carried out simultaneously and in a coordinated manner. Controller 130 is electrically connected to negative pressure side regulating valve 111, negative pressure side flow meter 112, positive pressure side regulating valve 121, and positive pressure side flow meter 122. The flow meters on both the positive and negative pressure sides simultaneously feed back flow signals to controller 130, which processes the flow signals and then issues appropriate opening commands to the positive and negative pressure side regulating valves respectively.

[0046] The negative pressure side regulating valve 111 works synchronously with the positive pressure side regulating valve 121 under the control of the controller 130. The negative pressure side regulating valve 111 introduces compressed air through the negative pressure side air inlet pipe 110, while the controller 130 sends an opening command to the negative pressure side regulating valve 111 through the third connection line 600.

[0047] The negative pressure side flow meter 112 must work synchronously with the positive pressure side flow meter 122, and then send a flow signal to the controller 130 at the same time. The upstream of the negative pressure side flow meter 112 is connected to the air passage of the negative pressure side regulating valve 111 through the connecting section 113 of the negative pressure side air inlet pipe 110, and the downstream is connected to the negative pressure side of the second end of the S-type bituminous tube 150 and the negative pressure side pressure transmission pipe 140 respectively, and guides the airflow to the negative pressure side of the second end of the S-type bituminous tube 150. At the same time, it is connected to the controller 130 through the first connecting line 400, and transmits the signal of the negative pressure side flow meter 112 to the controller 130.

[0048] The positive pressure side regulating valve 121 works synchronously with the negative pressure side regulating valve 111 under the control of the controller 130. The positive pressure side regulating valve 121 introduces compressed air through the positive pressure side air inlet pipe 120, and at the same time, the controller 130 sends an opening command to the positive pressure side regulating valve 121 through the four connection lines 700.

[0049] The positive pressure side flow meter 122 has the same function as the negative pressure side flow meter 112. It must work synchronously with the negative pressure side flow meter 112 and send a flow signal to the controller 130 at the same time. The upstream of the positive pressure side flow meter 122 is connected to the positive pressure side regulating valve 121 through the connecting section 123 of the positive pressure side air inlet pipe 120. The downstream is connected to the positive pressure side of the second end of the S-type bituminous tube 150 and the positive pressure side pressure transmission pipe 141 respectively, and directs the airflow to the positive pressure side of the second end of the S-type bituminous tube 150. At the same time, it is connected to the controller 130 through the second connecting line 500, and transmits the signal of the positive pressure side flow meter 122 to the controller 130.

[0050] The differential pressure transmitter 142 is connected to the negative pressure side and positive pressure side of the second end of the S-type bit tube 150 through the negative pressure side pressure transmission pipe 140 and the positive pressure side pressure transmission pipe 141, respectively, and is also connected to the second end of the negative pressure side air inlet pipe 110 and the positive pressure side air inlet pipe 120, thereby transmitting pressure data to the differential pressure transmitter 142 for measurement.

[0051] The function of the S-shaped pressure tube 150 is to collect the airflow direction inside the pulverized coal pipe, resulting in different resistance values ​​at the negative pressure side pressure transmission port 200 and the positive pressure side pressure transmission port 300.

[0052] The negative pressure side calibration valve 152 is normally closed and is only opened when in use. It is used to connect the negative pressure interface of the micromanometer during calibration.

[0053] The negative pressure side pressure transmission port 200 is located on the negative pressure side of the head of the S-shaped bituminous tube 150, facing away from the airflow direction. Its function is to work together with the positive pressure side pressure transmission port 300 to measure the total pressure inside the pulverized coal pipe. By ensuring a continuous flow of stable purging air from this point, no opportunity for ash to accumulate is left.

[0054] The positive pressure side calibration valve 154 has the same function as the negative pressure side calibration valve 152. The positive pressure side calibration valve 154 is normally closed and is only opened when in use. It is used to connect the positive pressure interface of the micromanometer during calibration.

[0055] The positive pressure side pressure transmitter 300, with the same function as the negative pressure side pressure transmitter 200, is located on the positive pressure side of the S-shaped bituminous tube 150, facing the airflow direction. Its purpose is to work in conjunction with the negative pressure side pressure transmitter to measure the total pressure inside the pulverized coal pipe. By ensuring that the airflow from the positive pressure side pressure transmitter 300 and the airflow from the negative pressure side pressure transmitter 200 are equal and continuous, no opportunity for ash accumulation is left.

[0056] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of this disclosure, and this disclosure is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this disclosure, and these modifications and improvements are also considered to be within the scope of protection of this disclosure.

Claims

1. A device for preventing blockage in pulverized coal pipes, characterized in that, The anti-clogging device includes an S-type bituminous tube assembly, a negative pressure side air inlet pipe, a negative pressure side regulating valve, a negative pressure side flow meter, a positive pressure side air inlet pipe, a positive pressure side regulating valve, a positive pressure side flow meter, and a controller; The first end of the S-shaped pressure tube assembly is inserted into the pulverized coal pipe, and the first end of the S-shaped pressure tube assembly is respectively provided with a negative pressure side pressure transmission port and a positive pressure side pressure transmission port; the negative pressure side pressure transmission port faces away from the airflow direction in the pulverized coal pipe, and the positive pressure side pressure transmission port faces the airflow direction in the pulverized coal pipe. The first ends of both the negative pressure side air inlet pipe and the positive pressure side air inlet pipe are used to receive compressed air. The second end of the negative pressure side air inlet pipe is connected to the negative pressure side of the second end of the S-type bit tube assembly, and the second end of the positive pressure side air inlet pipe is connected to the positive pressure side of the second end of the S-type bit tube assembly. The negative pressure side air inlet pipe is connected in series with the negative pressure side regulating valve and the negative pressure side flow meter from its first end to its second end. Both the negative pressure side regulating valve and the negative pressure side flow meter are electrically connected to the controller. The positive pressure side air inlet pipe is connected in series with the positive pressure side regulating valve and the positive pressure side flow meter from its first end to its second end. Both the positive pressure side regulating valve and the positive pressure side flow meter are electrically connected to the controller.

2. The anti-clogging device for pulverized coal pipes according to claim 1, characterized in that, The anti-blocking device also includes a negative pressure side pressure transmission pipe, a positive pressure side pressure transmission pipe, and a differential pressure transmitter; The first end of the negative pressure side pressure transmission tube is connected to the second end of the S-type bit tube assembly on the negative pressure side, and the second end of the negative pressure side pressure transmission tube is connected to the differential pressure transmitter. The first end of the positive pressure side pressure transmission tube is connected to the second end of the S-type bit tube assembly on the positive pressure side, and the second end of the positive pressure side pressure transmission tube is connected to the differential pressure transmitter.

3. The anti-clogging device for pulverized coal pipes according to claim 1, characterized in that, The S-type comparator assembly includes an S-type comparator, a negative pressure side calibration tube, a negative pressure side calibration valve, a positive pressure side calibration tube, and a positive pressure side calibration valve; The first end of the S-shaped pressure tube is inserted into the pulverized coal pipe, and the first end of the S-shaped pressure tube is respectively provided with the negative pressure side pressure transmission port and the positive pressure side pressure transmission port. The first end of the negative pressure side calibration tube is connected to the second end of the S-type bit tube on the negative pressure side, and the second end of the negative pressure side calibration tube is provided with the negative pressure side calibration valve; the first end of the positive pressure side calibration tube is connected to the second end of the S-type bit tube on the positive pressure side, and the second end of the positive pressure side calibration tube is provided with the positive pressure side calibration valve.

4. The anti-clogging device for pulverized coal pipes according to claim 3, characterized in that, The S-shaped bipod is made of ceramic.

5. A coal powder pipe anti-clogging system, characterized in that, The coal powder pipe anti-clogging system includes a coal powder pipe and a fixing component, and employs the anti-clogging device according to any one of claims 1 to 4; The side wall of the pulverized coal pipe is provided with a connecting through hole, and the fixing component is sealed and connected to the connecting through hole; the first end of the S-shaped tube assembly passes through the fixing component, and its second end is located outside the fixing component.

6. The pulverized coal pipe anti-clogging system according to claim 5, characterized in that, The fixing assembly includes a tube base and a cover plate; The tube seat is sealed to the connecting through hole, and the cover plate is sealed to the tube seat; the central area of ​​the cover plate has a through hole for sealing the passage of the S-shaped tube assembly.

7. The pulverized coal pipe anti-clogging system according to claim 6, characterized in that, The S-type comparator assembly includes an S-type comparator, a negative pressure side calibration tube, a negative pressure side calibration valve, a positive pressure side calibration tube, and a positive pressure side calibration valve. The pulverized coal pipe anti-clogging system also includes a micromanometer. The negative pressure port of the micromanometer is connected to the negative pressure side calibration valve, and the positive pressure port of the micromanometer is connected to the positive pressure side calibration valve.

8. The pulverized coal pipe anti-clogging system according to claim 6, characterized in that, The cover plate is made of stainless steel.

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