Anti-blocking device and anti-blocking system for pulverized coal pipe

Abstract

The embodiment of the invention provides an anti-blocking device and an anti-blocking system for a pulverized coal pipe. The anti-blocking device comprises an S-shaped pipe assembly, a negative pressure side air inlet pipe, a negative pressure side adjusting valve, a negative pressure side flow meter, a positive pressure side air inlet pipe, a positive pressure side adjusting valve, a positive pressure side flow meter and a controller. The first end of the S-shaped pitot tube assembly is inserted into the pulverized coal tube, the first ends of the negative pressure side air inlet pipe and the positive pressure side air inlet pipe are used for receiving compressed air, and the second ends of the negative pressure side air inlet pipe and the positive pressure side air inlet pipe communicate with the negative pressure side and the positive pressure side of the second end of the S-shaped pitot tube assembly correspondingly. The negative pressure side air inlet pipe is connected with a negative pressure side adjusting valve and a negative pressure side flowmeter in series, and the negative pressure side adjusting valve and the negative pressure side flowmeter are both electrically connected to the controller. The positive pressure side air inlet pipe is connected with a positive pressure side adjusting valve and a positive pressure side flow meter in series, and the positive pressure side adjusting valve and the positive pressure side flow meter are electrically connected to the controller. Compressed air is controlled to keep equal and constant flow at the positive pressure side and the negative pressure side and finally flows to the pressure transmission ports at the positive pressure side and the negative pressure side, so that the compressed air continuously flows out in a constant air flow mode and is not blocked by dust in the pulverized coal pipe.

Description

Technical Field

[0001] The embodiments of the present disclosure belong to the technical field of coal powder pipe anti-blocking, and specifically relate to an anti-blocking device and an anti-blocking system for coal powder pipes. Background Art

[0002] In thermal power plants, in order to reasonably adjust the air-coal ratio of coal mills, increase the boiler automation investment rate, make the boiler air distribution reasonable, and improve the combustion stability efficiency, it is necessary to accurately and stably measure the wind speed, air volume and pulverizing ventilation volume in the primary and secondary air ducts of the boiler for a long time. Since the primary, secondary air and pulverizing air have different degrees of dust-containing airflow, there are currently two types of primary and secondary air measurement devices, one is a differential pressure flowmeter and the other is a thermal mass flowmeter. The differential pressure flowmeter is based on the Bernoulli equation and the fluid continuity equation. According to the throttling principle, when the fluid flows through the throttling part (such as standard orifice plate, standard nozzle, long diameter nozzle, classic Venturi nozzle, Venturi nozzle, etc.), a pressure difference is generated before and after it, and this pressure difference value is proportional to the square of the flow rate. The measurement process of the differential pressure flowmeter is extremely easy to block, and the thermal mass flowmeter is expensive and the measurement process is easy to cause wear, especially in the layout and use of the pulverizing system, which aggravates the blockage and wear, resulting in the coal powder conveying pipe air volume measurement device cannot operate normally for a long time, which brings great challenges to long-term stable operation. Summary of the invention

[0003] The embodiments of the present disclosure aim to solve at least one of the technical problems existing in the prior art and provide an anti-blocking device and an anti-blocking system for a pulverized coal pipe.

[0004] On the one hand, an embodiment of the present disclosure provides an anti-blocking device for a pulverized coal pipe, the anti-blocking device comprising an S-type ratio tube assembly, a negative pressure side air intake pipe, a negative pressure side regulating valve, a negative pressure side flow meter, a positive pressure side air intake pipe, a positive pressure side regulating valve, a positive pressure side flow meter and a controller;

[0005] The first end of the S-type ratio tube assembly is inserted into the pulverized coal pipe, and the first end of the S-type ratio 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 the negative pressure side air inlet pipe and the positive pressure side air inlet pipe are both used to receive compressed air, the second end of the negative pressure side air inlet pipe is communicated with the negative pressure side of the second end of the S-type ratio tube assembly, and the second end of the positive pressure side air inlet pipe is communicated with the positive pressure side of the second end of the S-type ratio tube assembly;

[0007] The negative pressure side air intake pipe is connected in series with the negative pressure side regulating valve and the negative pressure side flow meter in sequence from the first end to the second end thereof, and the negative pressure side regulating valve and the negative pressure side flow meter are both electrically connected to the controller;

[0008] The positive-pressure side air intake pipe is sequentially connected in series with the positive-pressure side regulating valve and the positive-pressure side flow meter in a direction from the first end to the second end thereof, and the positive-pressure side regulating valve and the positive-pressure side flow meter are both 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 negative pressure side of the second end of the S-type ratio tube assembly, 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 positive pressure side of the second end of the S-type ratio tube assembly, and the second end of the positive pressure side pressure transmission tube is connected to the differential pressure transmitter.

[0012] Optionally, the S-type ratio tube assembly includes an S-type ratio 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;

[0013] The first end of the S-type ratio tube is inserted into the pulverized coal pipe, and the first end of the S-type ratio 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 negative pressure side of the second end of the S-type ratio tube, 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 positive pressure side of the second end of the S-type ratio tube, and the second end of the positive pressure side calibration tube is provided with the positive pressure side calibration valve.

[0015] Optionally, the S-type ratio tube is made of ceramic material.

[0016] On the other hand, an embodiment of the present disclosure provides a pulverized coal pipe anti-blocking system, the pulverized coal pipe anti-blocking system comprising a pulverized coal pipe and a fixing assembly, and adopts the anti-blocking device described above;

[0017] The side wall of the pulverized coal pipe is provided with a connecting through hole, and the fixing component is sealingly connected to the connecting through hole; the first end of the S-type ratio tube component is passed through the fixing component, and the second end thereof is located outside the fixing component.

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

[0019] The tube seat is sealingly connected to the connecting through hole, and the cover plate is sealingly connected to the tube seat; a through hole is opened in the central area of ​​the cover plate, and the through hole is used for sealingly passing the S-type ratio tube assembly.

[0020] Optionally, when the S-type ratio tube assembly includes an S-type ratio 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-blocking system further includes a micromanometer;

[0021] The negative pressure interface of the micromanometer is connected to the negative pressure side calibration valve, and the positive pressure interface 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-blocking device and anti-blocking system for coal powder pipes of the embodiments of the present disclosure control the compressed air to maintain a constant flow rate at the same speed and in the same amount on both sides of the positive and negative pressures, and finally flow to the pressure transmission ports on the positive and negative pressure sides, so that there is a continuous and constant airflow flowing out of the pressure transmission ports on the positive and negative pressure sides, so that they are not blocked by dust in the coal powder pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The present invention is a schematic structural diagram of a pulverized coal pipe anti-blocking system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, the present disclosure is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0026] like Figure 1 As shown, a device for preventing blocking of a pulverized coal pipe includes an S-type ratio tube assembly, a negative pressure side air intake pipe 110, a negative pressure side regulating valve 111, a negative pressure side flow meter 112, a positive pressure side air intake 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-type ratio tube assembly is inserted into the pulverized coal pipe, and the first end of the S-type ratio 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 in the pulverized coal pipe, and the positive pressure side pressure transmission port 300 faces the airflow direction in the pulverized coal pipe.

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

[0028] Specifically, Figure 1 As shown, during the operation of the anti-blocking device of the embodiment of the present disclosure, the negative pressure side pressure transmission port 200 of the first end of the S-type ratio tube 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 air inlet pipe 110 and the positive pressure side air inlet pipe 120 at the same time, and then flows to the negative pressure side regulating valve 111 and the positive pressure side regulating valve 121 respectively, and then flows to the negative pressure side flow meter 112 and the positive pressure side flow meter 122 respectively through the connecting section 113 of the negative pressure side air inlet pipe 110 and the connecting section 123 of the positive pressure side air inlet pipe 120.

[0029] At the same time, 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, resulting in inconsistent resistances of the negative pressure side pressure transmission port 200 and the positive pressure side pressure transmission port 300 (usually the resistance of the positive pressure side pressure transmission port is greater than the resistance of the negative pressure side pressure transmission port), resulting in inconsistent flow rates of the negative pressure side flowmeter 112 and the positive pressure side flowmeter 122. The negative pressure side flow meter 112 and the positive pressure side flow meter 122 transmit the flow signal to the controller 130 through the first connecting line 400 and the second connecting line 500 respectively, and then the controller 130 sends instructions to the negative pressure side regulating valve 111 and the positive pressure side regulating valve 121 through the third connecting line 600 and the fourth connecting line 700 respectively, so as to change the appropriate opening 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 realize that the flow through the negative pressure side intake pipe 110 and the positive pressure side intake pipe 120 to the negative pressure side pressure transmission port 200 and the positive pressure side pressure transmission port 300 is equal, and the flow readings of the negative pressure side flow meter 112 and the positive pressure side flow meter 122 are equal. Furthermore, by controlling the compressed air to maintain a constant flow rate at the same speed and in the same amount on both sides of the positive and negative pressures, the compressed air finally flows to the pressure transmission ports on the positive and negative pressures, so that a steady and constant airflow flows out of the pressure transmission ports on the positive and negative pressures, thereby preventing the compressed air from being blocked by dust in the pipe.

[0030] It is not difficult 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 through a connecting line, or they can be electrically connected to the controller wirelessly. The positive pressure side regulating valve 121 and the positive pressure side flow meter 122 can be electrically connected to the controller through a connecting line, or they can be electrically connected to the controller wirelessly. The embodiments of the present disclosure do not specifically limit this. The regulating valve can be set as an automatic regulating valve, and the flow meter can be set as an electronic flow meter.

[0031] The anti-blocking device and anti-blocking system for coal powder pipes of the embodiments disclosed in the present invention are based on the principle of effectively utilizing uninterrupted purge air to transfer pressure to the medium, and by overcoming the differential pressure of the positive and negative pressure side pressure transmission ports at the first end of the S-type ratio tube assembly in the coal powder pipe, the purge air flowing into the positive and negative pressure side pressure transmission ports at the first end of the S-type ratio tube assembly is equal in amount and at a constant speed, thereby meeting the requirement of uninterrupted online measurement around the clock. By overcoming the airflow direction inside the coal powder pipe, different pressures are generated on the negative pressure side pressure transmission port and the positive pressure side pressure transmission port, thereby affecting the purge air resistance entering the negative pressure side pressure transmission port and the positive pressure side pressure transmission port, and then the controller automatically coordinates the resistance of the positive and negative pressure sides to make the flow equal and stabilize the flow to achieve the purpose of testing the air volume steadily.

[0032] For example, Figure 1 As shown, the anti-blocking device also includes a negative pressure side pressure transmission tube 140, a positive pressure side pressure transmission tube 141 and a differential pressure transmitter 142. The first end of the negative pressure side pressure transmission tube 140 is connected to the negative pressure side of the second end of the S-type ratio tube assembly, and the second end of the negative pressure side pressure transmission tube 140 is connected to the differential pressure transmitter 142. The first end of the positive pressure side pressure transmission tube 141 is connected to the positive pressure side of the second end of the S-type ratio tube assembly, and the second end of the positive pressure side pressure transmission tube 141 is connected to the differential pressure transmitter 142.

[0033] Specifically, Figure 1 As shown, the airflow flowing out of the positive pressure side pressure transmission port 300 of the S-type ratio tube assembly is affected by the airflow direction in the pulverized coal pipe, and the resistance is greater than the negative pressure side pressure transmission port, so the differential pressure between the positive and negative pressure side pressure transmission points can be measured at the differential pressure transmitter 142. Further, the controller 130 controls the opening of the positive and negative pressure side regulating valves, and at the same time, under the feedback of the positive and negative pressure side flow meters, controls the compressed air in the intake pipe to enter the positive and negative pressure side regulating valves and flow meters in sequence at a constant speed and in equal amounts, and then flows into the S-type ratio tube assembly. The resistances at the positive and negative pressure side pressure transmission ports of the S-type ratio tube assembly are different, so that the pressure is transmitted to the differential pressure transmitter. The airflow output from the positive-pressure side pressure transmission port 300 facing the airflow and the negative-pressure side pressure transmission port 200 facing away from the airflow of the S-type ratio tube assembly simultaneously overcomes different resistances, so that the airflow output here remains equal and has a constant speed and constant amount. A steady stream of air flows out from here, preventing the dust in the pulverized coal pipeline from entering the S-type ratio tube assembly and causing blockage.

[0034] The anti-blocking device for coal powder pipe of the embodiment of the present disclosure is designed to control the compressed air of two equal flow rates to flow into the positive and negative pressure side pressure transmission ports of the S-type ratio tube assembly at a constant speed and in equal amounts. Even if the resistance of the positive and negative pressure side pressure transmission ports of the S-type ratio tube are different, one facing the airflow direction and the other facing the airflow direction, it can ensure that the compressed air flowing out of the positive and negative pressure side pressure transmission ports at the same time is constant and equal, so that the dust in the coal powder pipe cannot enter the positive and negative pressure side pressure transmission ports of the S-type ratio tube assembly. Since the resistances overcome by the positive and negative pressure side pressure transmission ports are different, the pressures on the positive and negative pressure side pressure transmission ports are also different, and the pressure is transmitted to the differential pressure transmitter through the S-type ratio tube assembly and the connected pipeline. It can effectively solve the problem of dust blockage, directly measure the differential pressure of the airflow in the coal powder pipe, and greatly improve the continuity and reliability of online measurement work.

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

[0036] Specifically, Figure 1 As shown, the positive pressure side calibration valve 154 and the negative pressure side calibration valve 152 are used as calibration and maintenance parts, which are normally closed and opened when in use. When in use, a micromanometer is connected to the positive pressure side calibration valve 154 and the negative pressure side calibration valve 152 respectively, and then the valve is opened to refer to the reading of the micromanometer to calibrate the accuracy of the differential pressure transmitter 142. As a specific example, the S-type ratio tube 150 can be set to a ceramic material.

[0037] On the other hand, Figure 1 As shown, an embodiment of the present disclosure provides a pulverized coal pipe anti-blocking system, which includes a pulverized coal pipe and a fixed component, and adopts the anti-blocking device described above. The specific structure of the anti-blocking device can refer to the relevant records in the previous text, and will not be described in detail here. The side wall of the pulverized coal pipe is provided with a connecting through hole, and the fixed component is sealed and connected to the connecting through hole. The first end of the S-type ratio tube assembly is passed through the fixed component, and the second end thereof is located outside the fixed component.

[0038] Furthermore, the fixing assembly includes a tube seat 160 and a cover plate 161. The tube seat 160 is sealed and connected to the connecting through hole, and the cover plate 161 is sealed and connected to the tube seat 160. A through hole is opened in the central area of ​​the cover plate 161, and the through hole is used to seal and penetrate the S-type ratio tube assembly.

[0039] Specifically, 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. A connecting through hole is opened on the side wall of the vertical section of the pulverized coal pipe to seal and install the pipe seat 160, which is used to fix the cover plate 161 and the S-type ratio tube 150. The cover plate 161 can be made of stainless steel and is sealed and screwed on the pipe seat 160, and the central through hole is used to fix the S-type ratio tube 150.

[0040] Further, when the S-type ratio tube assembly includes an S-type ratio tube 150, a negative pressure side calibration tube 151, a negative pressure side calibration valve 152, a positive pressure side calibration tube 153 and a positive pressure side calibration valve 154, the pulverized coal pipe anti-blocking system further 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, Figure 1 As shown, before use, the cover plate 161 is first sealed and tightened to be fixed on the pipe seat 160, and the S-type ratio tube 150 is inserted 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, and they are welded and fixed to ensure sealing. When two streams of compressed air flow into the two air inlet pipes at the same time, they flow to the positive pressure side regulating valve 121 and the negative pressure side regulating valve 111 respectively, and then flow 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 flow direction of the gas in the pipe, so that the resistance of the positive pressure side pressure transmission port 300 and the negative pressure side pressure transmission port 200 are inconsistent, resulting in inconsistent flow rates of the positive pressure side flow meter 122 and the negative pressure side flow meter 112. At the same time, the signals are transmitted to the controller 130 respectively, and then the controller 130 sends instructions to the positive and negative pressure side regulating valves respectively, changes the appropriate opening of the positive and negative pressure side regulating valves, overcomes the resistance of the positive pressure side pressure transmission port, and realizes 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. Effectively solve the problem of dust blockage.

[0042] At the same time, the 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. In addition, the positive pressure side calibration valve 154 and the negative pressure side calibration valve 152 are used as calibration and maintenance parts. When in use, the micromanometer is connected to the positive pressure side calibration valve 154 and the negative pressure side calibration valve 152 respectively, and then the valve is opened to refer to the micromanometer reading to calibrate the accuracy of the differential pressure transmitter 142, which greatly improves the continuity and reliability of online measurement work.

[0043] Combined with the above, the main components of the pulverized coal pipe anti-blocking system are explained in detail as follows:

[0044] The positive-pressure side air intake pipe 120 and the negative-pressure side air intake pipe 110 connected with compressed air are divided into positive and negative sides, and the positive and negative sides are respectively connected to the positive-pressure side regulating valve 121 and the negative-pressure side regulating valve 111. The compressed air is introduced as the purge 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] The controller 130, during the operation of the controller 130, must coordinate the control of the positive and negative pressure sides simultaneously, and the controller 130 is electrically connected to the negative pressure side regulating valve 111, the negative pressure side flow meter 112, the positive pressure side regulating valve 121 and the positive pressure side flow meter 122. The flow meters on the positive and negative pressure sides simultaneously feed back flow signals to the controller 130, and the controller 130 processes the flow signals and then issues appropriate opening instructions to the positive and negative pressure side regulating valves respectively.

[0046] The negative pressure regulating valve 111 works synchronously with the positive pressure regulating valve 121 under the control of the controller 130. The negative pressure regulating valve 111 introduces compressed air through the negative pressure side air intake pipe 110. At the same time, the controller 130 sends an opening instruction to the negative pressure regulating valve 111 through the third connecting 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 negative pressure side regulating valve 111 through the connecting section 113 of the negative pressure side air intake pipe 110, and the downstream is connected to the negative pressure side of the second end of the S-type ratio tube 150 and the negative pressure side pressure transmission pipe 140 respectively, and the airflow is guided to the negative pressure side of the second end of the S-type ratio tube 150. At the same time, it is connected to the controller 130 through the first connecting line 400 to transmit the signal of the negative pressure side flow meter 112 to the controller 130.

[0048] The positive-pressure regulating valve 121 works synchronously with the negative-pressure regulating valve 111 under the control of the controller 130. The positive-pressure regulating valve 121 introduces compressed air through the positive-pressure air intake pipe 120. At the same time, the controller 130 sends an opening instruction to the positive-pressure regulating valve 121 through the four-connection line 700.

[0049] The positive pressure side flow meter 122 has the same function as the negative pressure side flow meter 112, and 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 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 intake pipe 120 upstream, and is connected to the positive pressure side of the second end of the S-type ratio tube 150 and the positive pressure side pressure transmission pipe 141 downstream respectively, and guides the airflow to the positive pressure side of the second end of the S-type ratio tube 150. At the same time, it is connected to the controller 130 through the second connecting line 500 to transmit 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 the positive pressure side of the second end of the S-type comparison tube 150 through the negative pressure side pressure transmission tube 140 and the positive pressure side pressure transmission tube 141 respectively, and is also connected to the second ends of the negative pressure side air intake pipe 110 and the positive pressure side air intake pipe 120, thereby transmitting the pressure data to the differential pressure transmitter 142 for measurement.

[0051] The S-type ratio tube 150 is used to collect different resistance values ​​generated by the negative pressure side pressure transmission port 200 and the positive pressure side pressure transmission port 300 due to the airflow direction inside the pulverized coal pipe.

[0052] The negative pressure side calibration valve 152 is normally in a closed state and is opened only when in use, and 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-type ratio tube 150, facing away from the airflow direction, and its function is to cooperate with the positive pressure side pressure transmission port 300 to measure the total pressure in the pulverized coal pipe. By allowing stable purge air to flow out from here continuously, there is no chance for dust accumulation.

[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 in a closed state and is opened only when in use, and is used to connect the positive pressure interface of the micromanometer during calibration.

[0055] The positive pressure side pressure transmission port 300 has the same function as the negative pressure side pressure transmission port 200. It is located on the positive pressure side of the head of the S-type ratio tube 150 and faces the airflow direction. Its function is to cooperate with the negative pressure side pressure transmission port to measure the total pressure in the pulverized coal pipe. By making the airflow out of the positive pressure side pressure transmission port 300 equal to the airflow out of the negative pressure side pressure transmission port 200 and flowing out continuously, there is no chance for dust accumulation.

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

Claims

1. An anti-blocking device for a pulverized coal pipe, characterized in that: The anti-blocking device includes an S-type ratio tube assembly, a negative pressure side air intake pipe, a negative pressure side regulating valve, a negative pressure side flow meter, a positive pressure side air intake pipe, a positive pressure side regulating valve, a positive pressure side flow meter and a controller; The first end of the S-type ratio tube assembly is inserted into the pulverized coal pipe, and the first end of the S-type ratio 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 the negative pressure side air inlet pipe and the positive pressure side air inlet pipe are both used to receive compressed air, the second end of the negative pressure side air inlet pipe is communicated with the negative pressure side of the second end of the S-type ratio tube assembly, and the second end of the positive pressure side air inlet pipe is communicated with the positive pressure side of the second end of the S-type ratio tube assembly; The negative pressure side air intake pipe is connected in series with the negative pressure side regulating valve and the negative pressure side flow meter in sequence from the first end to the second end thereof, and the negative pressure side regulating valve and the negative pressure side flow meter are both electrically connected to the controller; The positive-pressure side air intake pipe is sequentially connected in series with the positive-pressure side regulating valve and the positive-pressure side flow meter in a direction from the first end to the second end thereof, and the positive-pressure side regulating valve and the positive-pressure side flow meter are both electrically connected to the controller.

2. The anti-blocking device for pulverized coal pipe 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 negative pressure side of the second end of the S-type ratio tube assembly, 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 positive pressure side of the second end of the S-type ratio tube assembly, and the second end of the positive pressure side pressure transmission tube is connected to the differential pressure transmitter.

3. The anti-blocking device for pulverized coal pipe according to claim 1, characterized in that: The S-type ratio tube assembly includes an S-type ratio 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 first end of the S-type ratio tube is inserted into the pulverized coal pipe, and the first end of the S-type ratio 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 negative pressure side of the second end of the S-type ratio tube, 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 positive pressure side of the second end of the S-type ratio tube, and the second end of the positive pressure side calibration tube is provided with the positive pressure side calibration valve.

4. The anti-blocking device for pulverized coal pipe according to claim 3, characterized in that: The S-type ratio tube is made of ceramic material.

5. A pulverized coal pipe anti-blocking system, characterized in that: The pulverized coal pipe anti-blocking system comprises a pulverized coal pipe and a fixing assembly, and adopts the anti-blocking 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 sealingly connected to the connecting through hole; the first end of the S-type ratio tube component is passed through the fixing component, and the second end thereof is located outside the fixing component.

6. The pulverized coal pipe anti-blocking system according to claim 5, characterized in that: The fixing assembly includes a pipe seat and a cover plate; The tube seat is sealingly connected to the connecting through hole, and the cover plate is sealingly connected to the tube seat; a through hole is opened in the central area of ​​the cover plate, and the through hole is used for sealingly passing the S-type ratio tube assembly.

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

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

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