阅读说明：本技术 基于智慧电厂建设风粉调节系统 (Based on wisdom power plant construction wind powder governing system ) 是由 祝英浩 邢振中 陈育 马宁 张风雷 黄惠 于 2021-06-19 设计创作，主要内容包括：一种基于智慧电厂建设风粉调节系统,设有风速控制组件和防堵装置；风速控制组件能够控制粉管水平段的煤粉流速,并使煤粉混合均匀；风速控制组件还避免重的煤粉沉积在粉管水平段；防堵装置则设有对粉管竖向段下端进行监测的静压测头；一旦发现堵塞,风速控制组件不再控制流速,防堵装置对竖向段下端进行吹扫,疏通堵塞。风速控制组件对粉管水平段进行控速,避免水平段煤粉沉积,提高风管水平段的取样精度,防堵装置能够清除粉管竖向段的堵塞,避免切割粉管以进行清理的费时费力情况发生；风速控制组件与防堵装置的结合,可以保证各个粉管在燃煤锅炉的输出端所输送的风粉混合均匀度偏差在一定范围内,避免燃烧偏斜,提高机组运行效益,保护设备。(A construction wind-powder adjusting system based on an intelligent power plant is provided with a wind speed control assembly and an anti-blocking device; the wind speed control assembly can control the flow velocity of the pulverized coal at the horizontal section of the powder pipe and uniformly mix the pulverized coal; the wind speed control assembly also prevents heavy pulverized coal from depositing on the horizontal section of the powder pipe; the anti-blocking device is provided with a static pressure measuring head for monitoring the lower end of the vertical section of the powder pipe; once the discovery is blockked up, the speed of flow is no longer controlled to wind speed control assembly, prevents stifled device and sweeps vertical section lower extreme, and the mediation is blockked up. The wind speed control assembly controls the speed of the horizontal section of the powder pipe, so that the coal powder deposition of the horizontal section is avoided, the sampling precision of the horizontal section of the air pipe is improved, the anti-blocking device can clear the blockage of the vertical section of the powder pipe, and the time-consuming and labor-consuming situation of cutting the powder pipe for cleaning is avoided; the combination of the air speed control assembly and the anti-blocking device can ensure that the air-powder mixing uniformity deviation of each powder pipe conveyed at the output end of the coal-fired boiler is within a certain range, avoid combustion deflection, improve the running benefit of a unit and protect equipment.)

1. A construction air-powder adjusting system based on an intelligent power plant is applied to a powder pipe from a coal mill to a coal-fired boiler, and is characterized by comprising an air speed control assembly and an anti-blocking device;

the wind speed control assembly is arranged in the horizontal section of the powder pipe and comprises a fan arranged in the powder pipe, a rotating shaft connected with the fan, a variable frequency motor with an output end connected with the tail end of the rotating shaft and a wind speed online measuring device; the wind speed online measuring device is arranged in front of the fan and is out of a distance of five times the diameter of the powder pipe; the rotating shaft penetrates through the wall of the elbow pipe connected with the horizontal section of the powder pipe; 2-4 fan blades of the fan;

the anti-blocking device is arranged at the lower end of the vertical section of the powder pipe and at the end part of the horizontal section connected with the vertical section of the powder pipe; the conveying direction of the pulverized coal in the vertical section of the powder pipe is from bottom to top; the anti-blocking device comprises a main air inlet pipe and three branch air inlet pipes; the main air inlet pipe is connected with the branch air inlet pipe through an electromagnetic valve; the anti-blocking device is also provided with two partial pipelines, three middle pipelines, a static pressure chamber and a plurality of output bent pipes which are distributed circumferentially from outside to inside in sequence; one branch gas inlet pipe is connected with one partial pipeline; each partial pipeline is connected with one middle pipeline through one partial hole; the other middle pipeline is connected with the rest branch gas inlet pipes; each intermediate pipeline is connected with the static pressure chamber through two intermediate holes; a static pressure measuring point is arranged in the static pressure chamber; one end of the output elbow is connected with the static pressure chamber, the other end of the output elbow is inserted into the pipe wall of the horizontal section, and the pipe orifice faces to the axis of an elbow, which is connected with the horizontal section and faces the vertical section; and a static pressure measuring head is arranged in the direction opposite to the direction of the pipe orifice of the output bent pipe.

2. The intelligent power plant construction-based air powder adjusting system of claim 1, wherein: a pitot tube for detecting wind speed is arranged in the wind speed online measuring device.

3. The intelligent power plant construction-based air powder adjusting system of claim 1, wherein: the partial distributing holes are symmetrically arranged, and the middle holes are arranged in a regular hexagon.

4. The intelligent power plant construction-based air powder adjusting system of claim 1, wherein: the total air inlet pipe is connected with a variable pressure high pressure air path.

5. The intelligent power plant construction-based air powder adjusting system of claim 1, wherein: the wind speed control assembly also comprises a wind control elbow and a plurality of middle straight pipes which are connected; the wind control elbow and the end part of the middle straight pipe are provided with flanges for connection; the wind control elbow is connected with the vertical section of the powder pipe; the middle straight pipe is connected with the horizontal section of the powder pipe; the rotating shaft is divided into a plurality of sections and comprises a near machine shaft and a near fan shaft which are connected with the output end of the variable frequency motor;

the wind control elbow is provided with three joints, wherein two joints are connected through an arc surface; the other joint is provided with a variable frequency motor; a shaft passing hole matched with the rotating shaft is formed at the position, close to the shaft, passing through the arc surface, and the end part of the shaft does not exceed the end surface of the connector; a square inner groove A is arranged near the end surface of the shaft;

a support frame is embedded in the end part of the middle straight pipe; the fan shaft penetrates through the support frames, and axial steps are arranged between the support frames; one end of the fan shaft is provided with a square boss A matched with the square inner groove A, and the other end of the fan shaft is provided with a square inner groove B identical with the square inner groove A; the bottom of the square inner groove B is provided with a threaded hole;

a fan is arranged at the tail end of the connected fan shaft; a boss B identical to the boss A is arranged on the side surface of the fan; the fan is provided with a through hole which penetrates through the fan and is matched with the threaded hole; a screw screwed into the threaded hole penetrates through the through hole.

6. The intelligent power plant construction-based air powder adjusting system of claim 6, wherein: the circumferential surface of the rotating shaft is coated with an anti-wear material.

7. The intelligent power plant construction-based air powder adjusting system of claim 6, wherein: the inner side of the supporting frame is provided with a sealing bearing matched with the fan-approaching shaft.

Technical Field

The invention relates to the technical field of intelligent power plant construction pulverized coal boiler pulverized coal conveying equipment, in particular to a construction air-powder adjusting system based on an intelligent power plant.

Background

In the 70's of the 20 th century, power plants entered the era of electrical automation, when they had a rudiment of smart power plants. The well-blowout type development of the computer technology in the 21 st century, the power plant also comes to the stage of the digital power plant. The power plant at this stage already has a certain degree of intelligence. The existing power plant enters a stage of supporting the power plant, and the overall control of the power plant is more detailed; nowadays, the demand of electric power has been sharply increased, and the fuel cost of thermal power generation has also been greatly increased; the thermal power plant needs to reduce the fuel cost of the thermal power station and improve the power generation efficiency so as to meet the increasing power demand and improve the operating condition of the power plant, and only can turn to an intelligent power plant; however, in order to solve this problem, the combustion efficiency of thermal power generation is considered; in the process of improving the combustion efficiency, two important parameters need to be more carefully controlled, and the air speed of the fuel powder conveyed into the boiler and the mixing uniformity of the fuel powder and air are improved; at present, most of thermal power generation adopts a coal-fired boiler and pulverized coal; the coal-fired boiler mostly adopts a four-corner tangential circle, W-shaped and front-back wall opposed firing mode to operate the boiler; the adjustment of the custom in the powder pipe in the prior art is realized by manually adjusting shrinkage cavity leveling (Chinese patent publication No. CN104864404A, which is named as a fixed shrinkage cavity device without powder accumulation and vertically arranged in a primary air pipe of a boiler powder manufacturing system, and the publication date is 2015, 8 months and 26 days); however, in the field, several powder pipes are from the same coal mill, and the air speed of other powder pipes can be influenced by randomly adjusting which powder pipe, so that the air speed can be adjusted only by repeatedly adjusting; meanwhile, even if the coal powder is conveyed by the same coal mill, heavy coal powder flows downwards in the horizontal section in the conveying process, the coal powder is light and heavy and is layered, the sampling precision of the coal powder in the horizontal section is influenced, and the judgment of an accurately controlled intelligent power plant is influenced; the heavy coal powder can be deflected to the lower end in the vertical section due to the influence of gravity; when the coal dust transportation direction is from bottom to top, heavy coal dust is easy to deposit at the elbow at the lower end; once the coal dust is deposited to a certain degree to cause blockage, cutting and cleaning are needed; the cleaning efficiency is low and the cost is high; and because the length of the horizontal section and the vertical section on each powder pipe is different, the air-powder mixing uniformity deviation of each powder pipe conveyed at the output end of the coal-fired boiler is larger, the combustion deflection is easily caused, the operation economy of a unit is influenced, and hidden troubles are buried in the safe operation of equipment.

Disclosure of Invention

The invention aims to solve the problems and provides a construction wind-powder adjusting system based on an intelligent power plant.

The technical scheme of the invention is as follows: a construction air-powder adjusting system based on an intelligent power plant is applied to a powder pipe from a coal mill to a coal-fired boiler and comprises an air speed control assembly and an anti-blocking device;

the wind speed control assembly is arranged in the horizontal section of the powder pipe and comprises a fan arranged in the powder pipe, a rotating shaft connected with the fan, a variable frequency motor with an output end connected with the tail end of the rotating shaft and a wind speed online measuring device; the wind speed online measuring device is arranged in front of the fan and is out of a distance of five times the diameter of the powder pipe; the rotating shaft penetrates through the wall of the elbow pipe connected with the horizontal section of the powder pipe; 2-4 fan blades of the fan;

the anti-blocking device is arranged at the lower end of the vertical section of the powder pipe and at the end part of the horizontal section connected with the vertical section of the powder pipe; the conveying direction of the pulverized coal in the vertical section of the powder pipe is from bottom to top; the anti-blocking device comprises a main air inlet pipe and three branch air inlet pipes; the main air inlet pipe is connected with the branch air inlet pipe through an electromagnetic valve; the anti-blocking device is also provided with two partial pipelines, three middle pipelines, a static pressure chamber and a plurality of output bent pipes which are distributed circumferentially from outside to inside in sequence; one branch gas inlet pipe is connected with one partial pipeline; each partial pipeline is connected with one middle pipeline through one partial hole; the other middle pipeline is connected with the rest branch gas inlet pipes; each intermediate pipeline is connected with the static pressure chamber through two intermediate holes; a static pressure measuring point is arranged in the static pressure chamber; one end of the output elbow is connected with the static pressure chamber, the other end of the output elbow is inserted into the pipe wall of the horizontal section, and the pipe orifice faces to the axis of an elbow, which is connected with the horizontal section and faces the vertical section; and a static pressure measuring head is arranged in the direction opposite to the direction of the pipe orifice of the output bent pipe.

Preferably, a pitot tube for detecting wind speed is arranged in the wind speed online measuring device.

Preferably, the partial dispersion holes are symmetrically arranged, and the middle holes are in a regular hexagon arrangement.

Preferably, the total air inlet pipe is connected with a variable-pressure high-pressure air path.

Preferably, the wind speed control assembly further comprises a wind control elbow and a plurality of middle straight pipes which are connected with each other; the wind control elbow and the end part of the middle straight pipe are provided with flanges for connection; the wind control elbow is connected with the vertical section of the powder pipe; the middle straight pipe is connected with the horizontal section of the powder pipe; the rotating shaft is divided into a plurality of sections and comprises a near machine shaft and a near fan shaft which are connected with the output end of the variable frequency motor;

the wind control elbow is provided with three joints, wherein two joints are connected through an arc surface; the other joint is provided with a variable frequency motor; a shaft passing hole matched with the rotating shaft is formed at the position, close to the shaft, passing through the arc surface, and the end part of the shaft does not exceed the end surface of the connector; a square inner groove A is arranged near the end surface of the shaft;

a support frame is embedded in the end part of the middle straight pipe; the fan shaft penetrates through the support frames, and axial steps are arranged between the support frames; one end of the fan shaft is provided with a square boss A matched with the square inner groove A, and the other end of the fan shaft is provided with a square inner groove B identical with the square inner groove A; the bottom of the square inner groove B is provided with a threaded hole;

a fan is arranged at the tail end of the connected fan shaft; a boss B identical to the boss A is arranged on the side surface of the fan; the fan is provided with a through hole which penetrates through the fan and is matched with the threaded hole; a screw screwed into the threaded hole penetrates through the through hole.

Preferably, the circumferential surface of the rotating shaft is coated with an anti-wear material.

Preferably, the inner side of the support frame is provided with a sealing bearing matched with the fan-approaching shaft.

The invention has the beneficial effects that: the invention relates to a construction wind-powder adjusting system based on an intelligent power plant, which is provided with a wind speed control assembly and an anti-blocking device; the wind speed control assembly can control the flow velocity of the pulverized coal at the horizontal section of the powder pipe and uniformly mix the pulverized coal; the wind speed control assembly also prevents heavy pulverized coal from depositing on the horizontal section of the powder pipe; the anti-blocking device is provided with a static pressure measuring head for monitoring the lower end of the vertical section of the powder pipe; once the discovery is blockked up, the speed of flow is no longer controlled to wind speed control assembly, prevents stifled device and sweeps vertical section lower extreme, and the mediation is blockked up.

The wind speed control assembly controls the speed of the horizontal section of the powder pipe, so that the coal powder deposition of the horizontal section is avoided, the sampling precision of the horizontal section of the air pipe is improved, the anti-blocking device can clear the blockage of the vertical section of the powder pipe, and the time-consuming and labor-consuming situation of cutting the powder pipe for cleaning is avoided; the combination of the air speed control assembly and the anti-blocking device can ensure that the air-powder mixing uniformity deviation of each powder pipe conveyed at the output end of the coal-fired boiler is within a certain range, avoid combustion deflection, improve the running benefit of a unit and protect equipment.

Drawings

FIG. 1 is a schematic view of an installation structure of all parts in a construction wind-powder adjusting system based on an intelligent power plant;

FIG. 2 is a front partial cross-sectional view of FIG. 1;

FIG. 3 is an enlarged view I of FIG. 2;

FIG. 4 is a schematic structural diagram of the assembly of the fan, the rotating shaft, the variable frequency motor, the wind control elbow, the middle straight pipe and the horizontal segment of the powder pipe;

FIG. 5 is one of the structural schematic diagrams of the variable frequency motor, the wind-controlled elbow and the near-machine shaft assembly;

FIG. 6 is a second schematic structural view of the variable frequency motor, the wind-controlled elbow and the near-machine axis assembly;

FIG. 7 is a schematic view of the mounting structure of the intermediate straight tube and the near fan shaft;

FIG. 8 is a left side view of FIG. 7;

FIG. 9 is a schematic view of the structure of the anti-clogging means;

FIG. 10 is a rear partial cross-sectional view of FIG. 9;

FIG. 11 is a schematic view of a fan;

FIG. 12 is a block diagram of the working principle of the present invention;

in the figure: 11, a fan, 111, a boss B, 112, a through hole, 113, a screw, 12, a rotating shaft, 121, a near shaft, 1211, a square inner groove A, 122, a near fan shaft, 1221, a step, 1222, a square boss A, 1223, a square inner groove B, 12231, a threaded hole, 13, a variable frequency motor, 14, an online wind speed measuring device, 15, a wind control elbow, 151, a flange, 152, an arc surface, 1521, a shaft passing hole, 16, a middle straight pipe, 161, a support frame, 1611, a sealing bearing, 2, an anti-blocking device, 21, a total air inlet pipe, 22, a branch air inlet pipe, 23, an electromagnetic valve, 24, a branch pipeline, 241, a branch hole, 25, a middle pipeline, 251, a middle hole, 26, a static pressure chamber, 261, a static pressure measuring point, 262, 27, an output bent pipe and 3, a horizontal section of a powder pipe.

Detailed Description

Example (b): referring to fig. 1-12, a construction wind-powder regulating system based on an intelligent power plant is applied to a powder pipe from a coal mill to a coal-fired boiler, and comprises a wind speed control assembly and an anti-blocking device;

the wind speed control assembly is arranged in the horizontal section of the powder pipe and comprises a fan arranged in the powder pipe, a rotating shaft connected with the fan, a variable frequency motor with an output end connected with the tail end of the rotating shaft and a wind speed online measuring device; the airflow rotated out by the fan is the same as the pulverized coal in the powder pipe in the wind direction, so that the internal resistance of the powder pipe cannot be increased, and meanwhile, the airflow rotated out by the fan can mix the pulverized coal again, so that the accuracy of the pulverized coal is improved; in addition, the fan accelerates the pulverized coal, supplements the speed loss in the pulverized coal circulation process, and ensures the mixing uniformity of the air and the powder conveyed at the output end of the coal-fired boiler from the side; the variable frequency motor can change the rotating speed of the fan according to the result of the wind speed online measuring device, so that the coal powder flow speed in the powder pipe is ensured to be stable; the wind speed online measuring device is arranged in front of the fan and out of a distance which is five times the diameter of the powder pipe, so that the influence of vortex formed by the fan on the measuring precision of the wind speed online measuring device is reduced; the rotating shaft penetrates through the wall of the elbow pipe connected with the horizontal section of the powder pipe; 2-4 fan blades of the fan are used for ensuring that the flow velocity in the powder pipe is increased and simultaneously reducing the obstruction of the fan blades to the flow of the pulverized coal in the powder pipe; in the embodiment, 2 sheets are selected;

the anti-blocking device is arranged at the lower end of the vertical section of the powder pipe and at the end part of the horizontal section connected with the vertical section of the powder pipe; the conveying direction of the pulverized coal in the vertical section of the powder pipe is from bottom to top; the anti-blocking device comprises a main air inlet pipe and three branch air inlet pipes; the main air inlet pipe is connected with the branch air inlet pipe through an electromagnetic valve; the main gas inlet pipe and the branch gas inlet pipe are separated by the electromagnetic valve, so that when the main gas inlet pipe is disconnected, high-pressure gas in the anti-blocking device backflushs the main gas inlet pipe, and pulverized coal in the pulverized coal pipe enters the anti-blocking device; the anti-blocking device is also provided with two partial pipelines, three middle pipelines, a static pressure chamber and a plurality of output bent pipes which are distributed circumferentially from outside to inside in sequence; one branch gas inlet pipe is connected with one partial pipeline; each partial pipeline is connected with one middle pipeline through one partial hole; the other middle pipeline is connected with the rest branch gas inlet pipes; each intermediate pipeline is connected with the static pressure chamber through two intermediate holes; the high-pressure gas in the main gas inlet pipe can uniformly enter the static pressure chamber along the pipeline for pressure equalization; a static pressure measuring point is arranged in the static pressure chamber and used for monitoring the pressure in the static pressure chamber; one end of the output elbow is connected with the static pressure chamber, the other end of the output elbow is inserted into the pipe wall of the horizontal section, and the pipe orifice faces to the axis of an elbow, which is connected with the horizontal section and faces the vertical section; the high-pressure gas which is uniformly distributed in the static pressure chamber can be sprayed out from the output elbow to carry out all-around spraying in the elbow, and the deposited coal dust in the elbow is removed; and a static pressure measuring head is arranged on the inner wall of the anti-blocking device and in the direction opposite to the direction of the pipe orifice of the output bent pipe, and is used for monitoring the lower end of the vertical section of the powder pipe.

The wind speed on-line measuring device is internally provided with a pitot tube for detecting wind speed, and the contents in 12 and 22 months in 2017 are disclosed by referring to a pitot tube component and a flow velocity measuring instrument using the pitot tube component in the utility model patent with the Chinese patent publication number of CN 206788201U, which are not repeated herein.

The partial distributing holes are symmetrically arranged, and the middle holes are arranged in a regular hexagon, so that high-pressure gas entering the static pressure chamber is more uniform.

The total air inlet pipe is connected with a variable-pressure high-pressure air path and matched with the static pressure measuring point; and the output pressure of the high-pressure gas circuit is vertically changed according to the measurement of the static pressure measuring point so as to ensure the constant pressure in the pressure stabilizing chamber.

The wind speed control assembly also comprises a wind control elbow and a plurality of middle straight pipes which are connected; the wind control elbow and the end part of the middle straight pipe are provided with flanges for connection; the wind control elbow is connected with the vertical section of the powder pipe; the middle straight pipe is connected with the horizontal section of the powder pipe; the rotating shaft is divided into a plurality of sections and comprises a near machine shaft and a near fan shaft which are connected with the output end of the variable frequency motor;

the wind control elbow is provided with three joints, wherein two joints are connected through an arc surface; the arc-shaped surface enables the coal dust flowing in the arc-shaped surface to smoothly turn; the other joint is provided with a variable frequency motor; a shaft passing hole matched with the rotating shaft is formed at the position, close to the shaft, passing through the arc surface, and the end part of the shaft does not exceed the end surface of the connector; a square inner groove A is arranged near the end surface of the shaft; relatively speaking, the sealing of the end surface of the joint is more reliable relative to the sealing of the arc-shaped surface at the position of the shaft hole; the arc-shaped surface can play a role in changing the direction of coal powder rotation;

a support frame is embedded in the end part of the middle straight pipe; the fan shaft penetrates through the support frames, and axial steps are arranged between the support frames; the support frame provides support for the fan shaft and provides axial restraint for the step; one end of the fan shaft is provided with a square boss A matched with the square inner groove A, and the other end of the fan shaft is provided with a square inner groove B identical with the square inner groove A; the square boss A can be matched with the square inner groove A and the square inner groove B to enable the shaft close to the machine and the shaft close to the fan to form a whole body capable of transmitting torque; the bottom of the square inner groove B is provided with a threaded hole;

a fan is arranged at the tail end of the connected fan shaft; a boss B identical to the boss A is arranged on the side surface of the fan; the fan can be inserted into the square inner groove B to obtain the torque transmitted from the rotating shaft for rotation; the fan is provided with a through hole which penetrates through the fan and is matched with the threaded hole; a screw screwed into the threaded hole penetrates through the through hole, so that the fan is fixed at the end part close to the fan shaft; the middle straight pipe that can make up can control the mounted position of fan, and then adapts to the powder pipe horizontal segment of different length.

The circumferential surface of the rotating shaft is coated with an anti-abrasion material or the inner side of the support frame is provided with a sealing bearing matched with the fan shaft so as to reduce the friction when the rotating shaft rotates; the sealing bearing is used for preventing pulverized coal from entering the bearing, damaging the bearing and further damaging the rotation of the fan.

For explaining the working principle of the embodiment, a DCS Control System (Distributed Control System) is used here, and other Control systems with similar functions can be used; the solid arrows indicate information flow, and the dashed arrows indicate physical flow;

the working principle of the wind speed control assembly is that when resistance deviation of each powder pipe is generally considered to be within 5% in coal powder conveying, the coal powder concentration of each powder pipe is considered to be almost the same, so that the aim of uniform and consistent wind speed and coal powder concentration is fulfilled; based on the purpose, after the wind speed control assembly in each powder pipe receives a wind speed adjusting instruction sent by the DCS, the wind speed control assembly enters an automatic operation mode; the variable frequency motor can change frequency according to the wind speed displayed on line by the wind speed on-line measuring device, adjust the rotating speed of the fan and ensure the uniformity of the wind speed in the powder pipe; when the deviation of the wind speed of each powder pipe is within 5%, the wind speed is considered to be the same, and when the deviation is within the interval, the rotating speed of the motor is not adjusted. The rated rotating speed of the fan is 200r/min, and the minimum adjusting amplitude is 2 r/min. The variable frequency motor of each powder pipe can reduce the internal resistance of the coal pulverizer after being started, and the operation of a powder making system is more facilitated.

The working principle of the anti-blocking device,

the anti-blocking device is carried out on the premise of the work of the wind speed control assembly, and under the action of the wind speed control assembly, the blocking of the powder pipe can occur at the lower end of a vertical section in the flowing direction from bottom to top; the static pressure measuring point in the static pressure chamber can monitor the pressure in the static pressure chamber; determining the output of the high-pressure gas circuit according to the pressure, ensuring that the purging pressure is constant and controlling the purging pressure to be 30 Kpa; and the static pressure measuring head behind the output bent pipe is used for measuring the static pressure in the primary air pipe, and the normal and blocked states of the air pipe are judged according to the static pressure. Once the static pressure inside the primary air pipe measured by the static pressure measuring head is always raised and exceeds a certain value, the problem of blockage at the lower end of the vertical section can be considered; the static pressure measuring head transmits signals to the DCS; after receiving the signal, the DCS cancels the automatic operation mode of the wind speed control assembly and recovers the wind speed before automatic operation; meanwhile, an electromagnetic valve in the anti-blocking device is communicated, and high-pressure gas sweeps the lower end of the vertical section for about 40 seconds once through an output bent pipe of the anti-blocking device; if the blowing-through cannot be carried out by one-time blowing, the operation is stable for 1 minute, and when the airflow at the lower end of the vertical section is not disturbed any more, the blowing-through is carried out for about 40 seconds for one time until the static pressure measuring head is restored to the level before the lifting; at the moment, the blockage at the lower end of the vertical section is blown through, and the electromagnetic valve is closed to cut off the high-pressure air source of the branch air pipe; after waiting for 5 minutes, the wind speed control assembly is switched to the automatic operation mode.