Air volume measurement system based on big data analysis

Abstract

The utility model provides a real-time and accurate air volume measurement system based on big data analysis, which comprises at least one big data air volume dynamic sensing device arranged in the cross section of an air duct of a non-uniform wind field, an air volume transmitter connected with the big data air volume dynamic sensing device, and a control monitoring analysis unit A for controlling and monitoring the big data air volume dynamic sensing device and the air volume transmitter. A big data air volume measurement dynamic sensing device is arranged in the cross section of the air duct of the non-uniform wind field, preset point positions are evenly distributed in the cross section of the air duct in an omnibearing mode, big data air volume measurement is conducted on the preset point positions, and the average air speed value of the cross section data of the air duct represents the actual air speed of the cross section. The problem that the geometric average wind speed value of an air volume measuring device in the prior art cannot measure the air volume of an air duct accurately is solved.

Description

[0001] The present application claims priority to the Chinese patent application No. 202211280223.9, filed on October 19, 2022, and entitled "Wind volume measurement system based on big data analysis", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application belongs to the technical field of wind volume measurement, and relates to a wind volume measurement system, in particular to a wind volume measurement system based on big data analysis. BACKGROUND

[0003] In the engineering design of coal-fired generating units, in order to achieve economic investment of the overall project, the length of the straight pipe section without equipment and bends in the boiler inlet air duct is often less than 1 times the diameter or cross-sectional side length of the air duct, which cannot meet the requirements of the national standard "Measurement of fluid flow in circular section conduits using area devices installed in such conduits - Part 4: Venturi meters" GB / T2624.4-2006 / ISO5167-4:2003 Clause 6.2, which specifies the shortest upstream and downstream straight pipe sections between various fittings and the Venturi meter. In addition, the boiler inlet air duct of the coal-fired generating unit is provided with an air regulating door, a support structure, a bend, a baffle, and even a variable diameter section, which results in that the air field at no cross section in the boiler inlet air duct is a uniform air field, and all the air ducts are non-uniform air field ducts, which cannot meet the requirements of the wind volume measurement device for the straight pipe sections before and after the device.

[0004] The existing wind volume measurement devices for the above-mentioned non-uniform air field ducts include the following types:

[0005] (1) Uniform velocity tube wind volume measurement device:

[0006] The uniform velocity tube wind volume measurement device is mainly composed of a wind volume flowmeter improved based on the Pitot tube speed measurement principle, that is, a plurality of pairs of sampling holes (two or more pairs of holes) are uniformly arranged before and after the length direction of the straight pipe section of the wind volume flowmeter, respectively, to measure the full positive pressure and full negative pressure of the fluid, and then the average differential pressure is measured by pressure equalization in the straight pipe section of the wind volume flowmeter, so as to calculate the flow of the fluid. The uniform velocity tube wind volume flowmeter, such as Weipuba, Aniuba, Deltauba, Weiba, and Superluba, has simple structure, convenient installation and removal, and small pressure loss. It is more accurate to set the uniform velocity tube wind volume flowmeter in a uniform air field duct for wind volume measurement. However, when the uniform velocity tube wind volume flowmeter is set in a non-uniform air field duct for wind duct volume measurement, since the plurality of pairs of sampling holes are linearly arranged (one-dimensional), the differential pressure after pressure equalization in the straight pipe section of the wind volume flowmeter cannot accurately represent the actual wind speed value of the cross section of the non-uniform air field duct, that is, the geometric mean wind speed value of the cross section is not equal to the actual wind speed value of the cross section, so the wind duct volume value cannot be accurately measured.

[0007] (2) Wind volume measurement device based on Venturi tube type wind volume flowmeter

[0008] Venturi type air flow meter is to use the gas flow through the air flow meter, first by thick to thin to speed up the gas flow, and then in the throat of the rear of the formation of a "vacuum" area, the vacuum area is provided with a negative pressure sampling hole, the sampling hole and the inlet sampling hole to form a differential pressure for air flow measurement. Venturi type air flow meter has the advantages of large differential pressure, high accuracy, small resistance loss; the venturi type air flow meter is set in the uniform wind field air duct, and the air flow measurement is more accurate, and the single point is set in the non-uniform wind field air duct, and the single point air flow measurement cannot guarantee the accuracy of the air duct air flow measurement, or the multiple points are set in the non-uniform wind field air duct, and the average differential pressure of the air flow measurement cannot accurately measure the cross section air duct average air flow value in real time, which is determined by the nature of the non-uniform wind field; to some extent, the large differential pressure of the single point or multiple point venturi air flow meter may become a disadvantage in the non-uniform wind field, which amplifies the error effect; the venturi type air flow meter such as single throat diameter pipe, double throat diameter pipe, multiple throat diameter pipe and the like.

[0009] (3) wing air flow measurement device

[0010] The wing air flow measurement device mainly places one or more wing type throttling devices with a flow passage cross-sectional area smaller than that of the air duct in the air duct, and measures the air duct air flow by using the pressure difference generated before and after the fluid flows through the wing type throttling device. The wing air flow measurement system is more commonly used in early small power coal-fired generator sets, which has the advantages of prefabricated throttling device in the air duct, combined with rectification and measurement function, and accurate air duct air flow measurement, but has the disadvantages of large volume, large throttling loss, complex structure, difficult installation and easy blockage.

[0011] (4) multi-point insertion type air flow measurement device

[0012] The multi-point insertion type air volume flow meter in the air volume measuring device based on the multi-point insertion type air volume flow meter is mainly composed of upper and lower inclined backrest pipes (inserting steel wire to prevent blockage), and adopts multi-point geometric average distribution on the cross section of the air duct. Each branch pipe establishes differential pressure, and then the branch pipes are connected to equalize pressure, and finally connected to the mother pipe to form the multi-point insertion type air volume flow meter. The geometric average air speed value, i.e. the actual air speed value, is obtained through multiple geometric equalization. However, the geometric average air speed value is not an approximate actual air speed value, and the error is particularly large. In addition, in the process of continuously equalizing pressure of the multi-point air volume measurement, the measurement gas micro-flow phenomenon exists in the equalization branch pipe, the branch pipe and the mother pipe, and the micro-particles in the air field are brought into the branch pipe, the branch pipe and the mother pipe. This micro-flow phenomenon exists every moment with the change of load and air field vortex, which leads to the rapid blockage of the mother pipe by dust, resulting in smaller and smaller differential pressure. In order to solve the above dust blockage problem, a steel wire that vibrates with air speed is arranged in the upper and lower inclined backrest pipes to solve the problem. However, in fact, the steel wire only vibrates at a certain specific load air speed, and does not vibrate at other loads. In addition, under normal load, it is impossible to have alternating air speed in the air duct to make the steel wire vibrate. Therefore, the insertion of the steel wire in the upper and lower inclined backrest pipes cannot solve the problem of dust blockage in the multi-point insertion type air volume flow meter. In this way, it is difficult to accurately measure the air volume in the non-uniform air field air duct according to the geometric average sampling point based on the matrix multi-point insertion type air volume flow meter.

[0013] In summary, the existing air volume measurement technology cannot accurately and timely measure the air volume in the non-uniform air field air duct, especially in the air inlet duct of the coal-fired boiler. SUMMARY

[0014] In order to solve the problem of inaccurate measurement of the air volume in the non-uniform air field air duct in the above-mentioned prior art, the present application provides a real-time and accurate air volume measurement system based on big data analysis; comprising at least one big data air volume dynamic sensing device arranged in the cross section of the non-uniform air field air duct, an air volume transmitter connected thereto, and a control monitoring and analysis unit A for controlling and monitoring them.

[0015] Preferably, the big data air volume dynamic sensing device comprises a sensing driving part and a driven air volume sensing part, a sensing driving part driving part, the sensing driving part driving part comprising a transmission part and a driving part for driving the sensing driving part; the driven air volume sensing part comprises a dynamic air volume sensing member and a rotating part for moving the dynamic air volume sensing member back and forth on the sensing driving part; or the driven air volume sensing part comprises a plurality of air volume flow meters uniformly distributed on the sensing driving part.

[0016] Preferably, the large data air volume dynamic sensing device is a large data air volume dynamic warp and weft sensing device, which comprises a warp sensing main driven part and a weft sensing slave driven air volume sensing part, a warp sensing main driven part driving part, the warp sensing main driven part driving part comprises a vertical transmission part for driving the warp sensing main driven part and a vertical driving part thereof.

[0017] Preferably, the weft sensing slave driven air volume sensing part comprises a weft dynamic air volume sensing member and a transverse rotating part for moving the weft dynamic air volume sensing member transversely back and forth in the air duct on the warp sensing main driven part.

[0018] Preferably, the weft dynamic air volume sensing member comprises a sliding block and an air volume flow meter fixed thereon.

[0019] Preferably, the weft sensing slave driven air volume sensing part comprises a plurality of air volume flow meters uniformly distributed on the warp sensing main driven part.

[0020] Preferably, the number of air volume transmitters is the same as the number of air volume flow meters, and each air volume flow meter is respectively connected to a sampling pipe, or the air volume flow meter is connected to an air volume transmitter through positive and negative equalizing pipes.

[0021] Preferably, the air volume flow meter is at least one of a Pitot tube air volume flow meter and a Venturi type air volume flow meter.

[0022] Preferably, the Venturi type air volume flow meter is at least one of a single throat diameter pipe air volume flow meter, a double throat diameter pipe air volume flow meter, and a multi-throat diameter pipe air volume flow meter.

[0023] Preferably, the warp sensing main driven part comprises a transverse part and a vertical part, the transverse part body is a reverse C-shaped structure, the vertical part body is a long strip-shaped closed shell, the transverse part body and the vertical part body are welded together to form a reverse T-shaped structure; the transverse rotating part comprises left and right transverse fixed pulleys respectively arranged at both ends of the transverse part body and partially exposed on the top surface of the transverse part body, left and right corner fixed pulleys respectively arranged at both inner sides of the lower end of the vertical part body, an upper fixed pulley arranged at the inner side of the upper end of the vertical part body, a transverse rotating steel wire wound on the left and right transverse fixed pulleys, the left and right corner fixed pulleys, and the upper fixed pulley, and a transverse stepping motor for driving the upper fixed pulley; the weft dynamic air volume sensing member is fixed to the lower end of the transverse part body and arranged on the transverse rotating steel wire.

[0024] Preferably, the vertical transmission part comprises a vertical transmission part body, upper and lower fixed seats respectively arranged at the upper and lower ends of the vertical transmission part body and each provided with a bearing, and a vertical screw rod fixed in the bearings of the upper and lower fixed seats; the upper end of the transverse part body is further provided with a nut threadedly connected with the vertical screw rod; and the driving part is a vertical stepping motor fixed on the upper end surface of the vertical transmission part body and axially driving the vertical screw rod.

[0025] Preferably, the axial sensing active part comprises a transverse part and a vertical part, the transverse part is a reverse C-shaped structure in cross section, the vertical part is a long strip-shaped closed shell, the transverse part and the vertical part are welded together to form a reverse T-shaped structure; the air volume flowmeter is fixed at the lower end of the transverse part.

[0026] Preferably, the vertical transmission part comprises a vertical transmission part body and upper and lower fixed seats with bearings respectively arranged at the upper and lower ends of the vertical transmission part body, and a vertical screw fixed in the bearings of the upper and lower fixed seats; the upper end of the transverse part body is further provided with a nut threadedly connected with the vertical screw; the driving part is a vertical stepping motor which is fixed on the upper end surface of the vertical transmission part body and axially drives the vertical screw.

[0027] Preferably, the large data air volume dynamic sensing device is a large data air volume dynamic axial radial sensing device, which comprises an axial sensing active part, a radial driven air volume sensing part, and an axial sensing active part driving part; the axial sensing active part driving part comprises an axial transmission part and an axial driving part which axially drives the axial sensing active part.

[0028] Preferably, the radial driven air volume sensing part comprises a radial dynamic air volume sensing member and a radial rotating part which moves the radial dynamic air volume sensing member radially back and forth in the air duct on the axial sensing active part.

[0029] Preferably, the radial dynamic air volume sensing member comprises a sliding block A and an air volume flowmeter A fixed thereon.

[0030] Preferably, the radial driven air volume sensing part comprises a plurality of air volume flowmeters A uniformly arranged on the axial sensing active part.

[0031] Preferably, the number of air volume transmitters is the same as the number of air volume flowmeters A, and each air volume flowmeter A is respectively connected with a sampling pipe, or the air volume flowmeters A are connected with an air volume transmitter through positive and negative equalizing pipes.

[0032] Preferably, the air volume flowmeter A is at least one of a Pitot tube air volume flowmeter and a Venturi type air volume flowmeter.

[0033] Preferably, the Venturi type air volume flowmeter is at least one of a single throat diameter tube air volume flowmeter, a double throat diameter tube air volume flowmeter, and a multi-throat diameter tube air volume flowmeter.

[0034] Preferably, the axial sensing driving part comprises an axial sensing driving part body with a C-shaped structure in cross section, and an opening on the right side thereof; the radial rotating part comprises a central fixed pulley and a circumferential fixed pulley respectively arranged at the two ends of the axial sensing driving part body, a dynamic radial transmission wire between the two fixed pulleys, a static transmission part for driving the central fixed pulley to rotate, a radial stepping motor for driving the same, and the radial dynamic air volume sensing member is fixed on the opening side of the axial sensing driving part body and arranged on the dynamic radial transmission wire.

[0035] Preferably, the axial transmission part comprises an axial transmission part body with an I-shaped structure in cross section, a central inner fixed pulley arranged at the center of the circular air duct on the front side of the axial transmission part body, a right end inner fixed pulley arranged at the right end of the axial transmission part body, and a static axial transmission wire between the two fixed pulleys; the axial transmission part body is fixed on the left and right walls of the circular air duct through the center of the circular air duct, and the right end of the axial transmission part body extends out of the wall of the air duct; the axial driving part is a axial stepping motor fixed on the axial transmission part body and connected to the right end inner fixed pulley through a shaft;

[0036] The axial sensing driving part body is further provided with a sleeve at the center point of the air duct, one end of the sleeve is fixed on the axial sensing driving part body at the center point of the circular air duct, and the other end is fixed between the inner and outer bearings of the vertical rib of the I-shaped structure of the axial transmission part body; the inner wall of the central inner fixed pulley is embedded in the outer wall of the sleeve;

[0037] The static transmission part comprises a central outer fixed pulley arranged at the center of the circular air duct on the back side of the axial transmission part body, a right end outer fixed pulley arranged at the right end of the axial transmission part body, and a static radial transmission wire between the two fixed pulleys; the radial stepping motor is fixed on the axial transmission part body and connected to the right end outer fixed pulley through a shaft; the central outer fixed pulley is connected to the central fixed pulley through a connecting shaft to drive the central fixed pulley to rotate, and the connecting shaft between the central outer fixed pulley and the central fixed pulley is embedded in the inner bearing.

[0038] Preferably, the axial transmission part comprises an axial transmission part body with an I-shaped structure in cross section, a central inner fixed pulley arranged at the center of the circular air duct on the front side of the axial transmission part body, a right end inner fixed pulley arranged at the right end of the axial transmission part body, and a static axial transmission wire between the two fixed pulleys; the axial transmission part body is fixed on the left and right walls of the circular air duct through the center of the circular air duct, and the right end of the axial transmission part body extends out of the wall of the air duct; the axial driving part is a axial stepping motor fixed on the axial transmission part body and connected to the right end inner fixed pulley through a shaft;

[0039] The axial sensing driving part body is further provided with a sleeve at the center point of the air duct, one end of the sleeve is fixed on the axial sensing driving part body at the center point of the circular air duct, and the other end is fixed between the inner and outer bearings of the vertical rib of the I-shaped structure of the axial transmission part body; the inner wall of the central inner fixed pulley is embedded in the outer wall of the sleeve;

[0040] The application utilizes the large data wind volume measurement dynamic sensing device arranged in the non-uniform wind field air duct cross section, uniformly distributes the preset points in the air duct cross section, and measures the large data wind volume of each preset point, so that the average wind speed value of the air duct cross section data represents the actual cross section wind speed, and the problem of inaccurate wind volume measurement of the geometric average wind speed value of the existing technology wind volume measurement device is solved. Especially when the technical scheme of the application is applied to the coal-fired boiler of the coal-fired generating set, the optimal air-coal ratio is more accurately reached or approached, which greatly improves the safety, combustion efficiency, energy saving and environmental protection of the coal-fired boiler, simultaneously improves the flexible power generation of the coal-fired generating set, and the economic benefit is obvious, thereby improving the stable operation of the entire power grid. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 is a front structure schematic diagram of a large data wind volume measurement dynamic longitude and latitude sensing device provided by embodiment one arranged in a rectangular air duct;

[0042] Figure 2 is Figure 1 is a schematic diagram of the A-A direction side section structure of the large data wind volume measurement dynamic longitude and latitude sensing device arranged in the rectangular air duct in

[0043] Figure 3 is a schematic diagram of the plane layout of the entering section of the primary hot air duct entering the ball mill in a 300 MW coal-fired generating set based on the large data analysis-based wind volume measurement system provided by embodiment one;

[0044] Figure 4 is Figure 3 is a schematic diagram of the B-B direction elevation layout of the entering section of the primary hot air duct entering the ball mill in

[0045] Figure 5 a is Figure 3 is a 3D wind speed measurement curve diagram of the wind volume measurement system in the simulation air duct section when the load value is 33% in

[0046] Figure 5 b is Figure 3 is a 3D wind speed measurement curve diagram of the wind volume measurement system in the simulation air duct section when the load value is 41.7% in

[0047] Figure 5 c is Figure 3 is a 3D wind speed measurement curve diagram of the wind volume measurement system in the simulation air duct section when the load value is 58.3% in

[0048] Figure 5 d is Figure 3 is a 3D wind speed measurement curve diagram of the wind volume measurement system in the simulation air duct section when the load value is 70% in

[0049] Figure 5 e is Figure 3 The 3D wind speed measurement curve diagram of the wind volume measurement system in the middle simulation air duct section at a load value of 87.6%;

[0050] Figure 5 f is Figure 3 The 3D wind speed measurement curve diagram of the wind volume measurement system in the middle simulation air duct section at a load value of 100%;

[0051] Figure 6 is Figure 3 The 3D curve diagram of the average wind speed value point position selected by the wind volume measurement system based on big data analysis in the middle simulation air duct section when the average wind speed value error is 6 / 4500;

[0052] Figure 7 The present application provides a kind of based on big data analysis's wind volume measurement method flow chart;

[0053] Figure 8 The present application provides a kind of based on big data analysis's wind volume measurement system determines data average wind speed value point position's method flow chart;

[0054] Figure 9 The present application provides a kind of based on big data analysis's wind volume measurement system and data average wind speed value point position setting wind volume flowmeter's wind volume measurement system combination's correction method flow chart;

[0055] Fig. 10 is a large data wind volume measurement dynamic shaft radial sensing device provided in a circular air duct according to the second embodiment, and a front structure is shown in the schematic diagram.

[0056] Fig. 11 is a large data wind volume measurement dynamic shaft radial sensing device provided in a circular air duct according to the second embodiment, and a C-C direction side structure is shown in the schematic diagram.

[0057] In the figure, the number 1 is a rectangular air duct; 2 is a longitudinal sensing main driving part, 2-1 is a vertical transmission part, 2-1-1 is a vertical transmission part body, 2-1-2 is an upper fixed seat, 2-1-3 is a lower fixed seat, 2-1-4 is a vertical screw, 2-1-5 is a vertical rail, 2-2 is a vertical driving part; 3 is a longitudinal sensing main driving part, 3-1 is a horizontal part, 3-1-1 is a horizontal part body, 3-1-2 is a horizontal rail, 3-2 is a vertical part, 3-2-1 is a vertical part body, 3-2-2 is a nut; 4 is a weft driven wind volume sensing part, 4-1 is a weft dynamic wind volume sensing piece, 4-1-1 is a sliding block, 4-1-2 is a wind volume flowmeter, 4-2 is a horizontal rotating part, 4-2-1 is a left horizontal fixed pulley, 4-2-2 is a right horizontal fixed pulley, 4-2-3 is a left corner fixed pulley, 4-2-4 is a right corner fixed pulley, 4-2-5 is an upper fixed pulley, 4-2-6 is a horizontal rotating steel wire, 4-2-7 is a horizontal stepping motor;

[0058] 1' circular air duct; 5 axial sensing active part, 5-1 axial sensing active part body, 5-1-1 transverse track A, 5-1-2 sleeve; 6 radial driven air volume sensing part, 6-1 radial dynamic air volume sensing member, 6-1-1 slider A, 6-1-2 air volume flowmeter A, 6-2 radial rotating part, 6-2-1 center fixed pulley, 6-2-2 circumferential fixed pulley, 6-2-3 dynamic radial transmission steel wire, 6-2-4 static transmission part, 6-2-6 center outer fixed pulley; 7-1 axial transmission part, 7-1-1 axial transmission part body, 7-1-2 center inner fixed pulley, 7-1-3 right end inner fixed pulley, 7-1-4 static axial transmission steel wire;

[0059] 10 ball mill, 11 expansion joint A, 12 expansion joint B, 13 cold air pipe, 14 cold air outlet, 15 shut-off valve, 16 regulating valve, 17 expansion joint C, 0.00 elevation 0.00 m, 2.235 elevation 2.235 m, 6.10 elevation 6.10 m, 8.30 elevation 8.30 m. DETAILED DESCRIPTION

[0060] The concept of the big data air volume dynamic sensing device is that the wind speed of each point in the cross section of the vertical gas flow direction in the non-uniform wind field air duct is measured one by one, so as to measure the air duct wind speed in all directions and determine the data average wind speed value or / and the data average wind speed point of the non-uniform wind field air duct through big data analysis. For example, the big data air volume dynamic latitude and longitude sensing device and the big data air volume dynamic axial radial sensing device.

[0061] The big data air volume dynamic sensing device includes a sensing active part and a driven air volume sensing part, a sensing active part driving part, the sensing active part driving part includes a transmission part and a driving part (meridional or axial direction sampling) for driving the sensing active part, the driven air volume sensing part includes a dynamic air volume sensing member and a rotating part for moving the dynamic air volume sensing member back and forth on the sensing active part (latitude or radial direction sampling), or the driven air volume sensing part includes a plurality of air volume flowmeters (latitude or radial direction sampling) uniformly distributed on the sensing active part.

[0062] The big data air volume dynamic sensing device is arranged in the cross section of the non-uniform wind field air duct, is in communication with the air volume transmitter, and together with a control monitoring and analyzing unit A for controlling and monitoring them constitutes an air volume measurement system based on big data analysis.

[0063] The control monitoring and analyzing unit A controls the big data air volume dynamic sensing device to measure the wind speed of each point in the cross section of the vertical gas flow direction one by one under a certain air duct specific load value, so as to measure the air duct wind speed in all directions and obtain the data average wind speed value or determine the corresponding point.

[0064] The present application will be further clarified by the following description of the embodiments, which should be understood are presented by way of example and not limitation. It is to be understood that the specific example embodiments are presented herein for the purpose of illustration and description, and are subject to modification.

[0065] Example 1

[0066] As shown in Figure 1 and 2 , a large data air volume dynamic sensing device provided by the present application is arranged in a rectangular air duct structure schematic diagram, the large data air volume dynamic sensing device is a large data air volume dynamic sensing device; the large data air volume dynamic sensing device is arranged in a certain cross section of the rectangular air duct 1, which includes a meridional sensing active part 3, a latitudinal driven air volume sensing part 4, a meridional sensing active part driving part 2, the meridional sensing active part driving part 2 includes a vertical transmission part 2-1 and a vertical driving part 2-2 which drive the meridional sensing active part; the latitudinal driven air volume sensing part 4 includes a latitudinal dynamic air volume sensing member 4-1 and a horizontal rotating part 4-2 which moves the latitudinal dynamic air volume sensing member 4-1 (X axis direction, i.e. latitudinal) back and forth in the meridional sensing active part.

[0067] The meridional sensing active part 3 includes a horizontal part 3-1 and a vertical part 3-2, the meridional sensing active part 3 body is a reverse T-shaped structure, the horizontal part body 3-1-1 cross section is a reverse C-shaped structure, the inner top surface of the C-shaped structure is provided with a horizontal rail 3-1-2; the vertical part body 3-2-1 is a long strip-shaped closed shell, the horizontal part body 3-1-1 and the vertical part body 3-2-1 are welded together to form a reverse T-shaped structure; a nut 3-2-2 is arranged on the rear side upper end of the vertical part body.

[0068] The horizontal rotating part 4-2 includes left and right horizontal fixed pulleys 4-2-1, 4-2-2 arranged at both ends of the horizontal part body 3-1-1 and partially exposed on the top surface of the horizontal part body 3-1-1, left and right corner fixed pulleys 4-2-3, 4-2-4 arranged at both inner sides of the lower end of the vertical part body 3-2-1, an upper fixed pulley 4-2-5 arranged at the upper end of the vertical part body 3-2-1, a horizontal rotating steel wire 4-2-6 wound on the above left and right horizontal fixed pulleys, left and right corner fixed pulleys and upper fixed pulley, and a horizontal stepping motor 4-2-7 driving the upper fixed pulley.

[0069] The latitudinal dynamic air volume sensing member 4-1 is fixed on the lower end of the horizontal part body and arranged on the horizontal rotating steel wire 4-2-6; the latitudinal dynamic air volume sensing member 4-1 includes a sliding block 4-1-1 sliding along the horizontal rail and an air volume flow meter 4-1-2 fixed thereon and located below the C-shaped structure of the horizontal part body.

[0070] The vertical transmission part 2-1 includes a vertical transmission part body 2-1-1, upper and lower fixed seats 2-1-2 and 2-1-3 each provided with a bearing at the upper and lower ends thereof, and a vertical screw 2-1-4 fixed in the bearings of the upper and lower fixed seats; the vertical driving part 2-2 is a vertical stepping motor fixed on the upper end surface of the transmission part body 2-1-1 and axially driving the vertical screw 2-1-4. The vertical transmission part body 2-1-1 has a groove-shaped structure in cross section, the bottom of the groove-shaped structure is provided with a vertical track 2-1-5 (for smoothly sliding the nut 3-2-2 in the groove), and the vertical transmission part body 2-1-1 is integrally fixed on the outer wall above the rectangular air duct 1; in this way, the meridional sensing driving part 3 is integrally moved up and down on the vertical screw 2-1-4 by the nut 3-2-2, thereby driving (in the Y-axis direction, i.e. the meridional direction).

[0071] The rectangular air duct air volume measurement system formed by the big data air volume dynamic latitude and longitude sensing device further includes an air volume transmitter connected with the air volume flow meter in the big data air volume dynamic latitude and longitude sensing device, and a control monitoring and analyzing unit A for controlling and monitoring the big data air volume dynamic latitude and longitude sensing device.

[0072] As shown in Figure 7 The present embodiment provides a big data analysis-based air volume measurement method for a non-uniform wind field air duct based on the rectangular air duct air volume measurement system, and the steps are as follows:

[0073] 1) In the control monitoring and analyzing unit A, the angle displacement of the air volume flow meter in the latitude and longitude directions is set each time (i.e. in the control monitoring and analyzing unit A, the moving displacement of the air volume flow meter in the horizontal (X-axis direction, i.e. the latitude direction) and vertical (Y-axis direction, i.e. the longitude direction) directions is set each time, i.e. the preset angle displacement of the horizontal and vertical stepping motors is set respectively; the angle displacement in the two directions can be the same or different each time);

[0074] 2) The control monitoring and analyzing unit A first controls the air volume flow meter to move in the longitude direction by a preset angle displacement, then controls the air volume flow meter to measure the wind speed values (i.e. the differential pressure values) of all preset points in the latitude direction one by one, simultaneously sends the measured air volume of the corresponding preset points to the air volume transmitter, and then stores the air volume electric signal in the control monitoring and analyzing unit A by the air volume transmitter (i.e. the control monitoring and analyzing unit A first controls the vertical stepping motor to move by a preset angle displacement, then controls the horizontal stepping motor to drive the upper fixed pulley to rotate the horizontal rotating steel wire 4-2-6 by a preset angle displacement, thereby driving the air volume flow meter to measure the wind speed values (i.e. the differential pressure values) of all preset points in the horizontal direction one by one, simultaneously sends the measured wind speed values of the corresponding preset points to the air volume transmitter, and then stores the air volume electric signal in the control monitoring and analyzing unit A by the air volume transmitter);

[0075] 3) Then, control the vertical stepper motor of the control monitoring and analysis unit A to move by a preset angular displacement, and repeat step 2 until the air volume flow meter measures the wind speed value of all preset points in the rectangular air duct from all directions.

[0076] 4) The control monitoring and analysis unit sums up the wind speed measurements at all the preset points and divides them by the number of preset points in the rectangular duct to obtain the average wind speed value of the duct data within the sampling period T. This value is the duct air volume measurement value.

[0077] The wind speed measurement of all preset points in the entire rectangular duct requires a sampling period T. However, the size of this sampling period T is determined by factors such as the speed of the horizontal and vertical stepper motors, the size of the rectangular duct, the number of preset points in the rectangular duct, and the wind speed in the rectangular duct. The shorter the sampling period T, the more accurate the average wind speed value of the duct data. However, when the duct load is constant, the average wind speed value of the duct data is independent of the size of the sampling period T.

[0078] The preset point interval is determined by requirements such as the size of the duct, the complexity of the wind field, and the accuracy of its air volume measurement.

[0079] like Figure 8 As shown, this embodiment also provides a method for determining the location of the average wind speed value using the above-mentioned rectangular duct airflow measurement system, based on the above-mentioned non-uniform wind field duct airflow measurement system. The steps are as follows:

[0080] 1) In the control monitoring and analysis unit A, set the angular displacement of the air volume flow meter in both the latitudinal and longitudinal directions (i.e., set the magnitude of each movement displacement of the air volume flow meter in both the horizontal (X-axis direction, i.e., latitudinal) and vertical (Y-axis direction, i.e., longitudinal) directions in the control monitoring and analysis unit A, i.e., set the angular displacement of the horizontal stepper motor and the vertical stepper motor respectively; the angular displacement of each movement in the two directions can be the same or different).

[0081] 2) Control monitoring and analysis unit A collects specific load values ​​for the air duct;

[0082] 3) Control monitoring analysis unit A first controls the air flow meter to move in the initial position through the direction of the movement of a predetermined angular displacement, and then controls the air flow meter to measure the wind speed value (i.e. differential pressure value) of all preset points in the latitude one by one, while sending the measured air flow corresponding to the preset point to the air flow transmitter, and then storing the air flow electric signal, its position signal and specific load value one by one in the control monitoring analysis unit A (i.e. the control monitoring analysis unit A first controls the vertical step motor to move a predetermined angular displacement, and then controls the horizontal step motor to drive the upper fixed pulley to rotate the horizontal rotating steel wire 4-2-6 to rotate a predetermined angular displacement, thereby driving the air flow meter to measure the wind speed value (i.e. differential pressure) of all preset points in the horizontal direction one by one, while sending the measured air flow corresponding to the preset point to the air flow transmitter, and then storing the air flow electric signal, its position signal and specific load value one by one in the control monitoring analysis unit);

[0083] 4) Control monitoring analysis unit A controls the air flow meter to move in the initial position through the direction of a predetermined angular displacement, and the step 3 is repeated until the air flow meter measures the wind speed value of all preset points in the rectangular air duct;

[0084] 5) Adjust the air duct load value (such as 35%, 40%, 50%, 60%, 70%, 80%, 90%, 100%) one by one in step 2; repeat steps 2, 3 and 4 until the wind speed value of all preset points in the monitored air duct under the load value (the load value is evenly selected within the allowable range of the air duct load value, such as 35%, 40%, 50%, 60%, 70%, 80%, 90%, 100% load) is measured;

[0085] 6) Control monitoring analysis unit A calculates the average wind speed value under each load value by adding all preset point wind speed values under different load values of the monitored air duct and then dividing by the number of preset points, and gradually increases the set air duct data average wind speed error from zero until at least one common preset point is determined, which is the air duct data average wind speed value point. The wind speed measurement value of the common preset point is within the range of the sum of the set air duct data average wind speed error after the average wind speed value under each load value is increased;

[0086] In addition, the embodiment also provides a wind volume measurement system based on the data average wind speed value point position setting air volume flow meter: setting air volume flow meters at each data average wind speed value point position determined according to the method for determining the data average wind speed value point position; since the wind speed values measured at each data average wind speed value point position are basically consistent, there is almost no air flow between the air volume flow meters at each data average wind speed value point position, and the wind speed values measured by the air volume flow meters at each data average wind speed value point position are connected to a wind volume transmitter through a pressure equalizing pipe, and then a control monitoring and analysis unit A forms a wind volume measurement system based on the data average wind speed value point position setting air volume flow meter. Of course, the air volume flow meters at each data average wind speed value point position do not equalize pressure through the pressure equalizing pipe, and can be connected to a wind volume transmitter respectively, so that the wind volume measurement system measures the wind volume more accurately.

[0087] Since the wind field of the air duct under different load values is a non-uniform wind field, the specific common point position of the data average wind speed value in the cross section of the air duct can be accurately found through the above method, and the air volume flow meter can be set at the point position, so that the air volume of the air duct can be measured in real time and accurately.

[0088] Secondly, based on the wind volume measurement system based on big data analysis and the wind volume measurement system based on the data average wind speed value point position setting air volume flow meter, the embodiment provides a correction system combining the wind volume measurement system based on big data analysis and the wind volume measurement system based on the data average wind speed value point position setting air volume flow meter, which comprises at least one big data wind volume dynamic latitude and longitude sensing device arranged in the cross section of the air duct and at least one data average wind speed value point position air volume flow meter arranged in the cross section of the air duct, and a wind volume transmitter connected to each of them respectively and control monitoring and analysis units A and B. Of course, in order to ensure the reliability of the air volume measurement result of the air duct, the correction system can also run simultaneously based on the wind volume measurement system based on big data analysis and the wind volume measurement system based on the data average wind speed value point position setting air volume flow meter, one standby one use to ensure the reliable and accurate air volume measurement of the air duct.

[0089] Finally, based on the correction system, the embodiment provides a correction method combining the wind volume measurement system based on big data analysis and the wind volume measurement system based on the data average wind speed value point position setting air volume flow meter, as shown in Figure 9 The method is to use at least one big data wind volume dynamic latitude and longitude sensing device arranged in the cross section of the air duct to perform full-range dynamic point-by-point wind speed measurement at a preset point position interval in each sampling period, then add all the wind speed measurement values of the preset point positions and divide by the preset point position number to obtain the data average wind speed value Fdps of the air duct (for details of the specific wind volume measurement method, see the wind volume measurement system based on big data analysis and the wind volume measurement system based on the data average wind speed value point position setting air volume flow meter). Figure 7The flow chart of the method for measuring the air volume of a non-uniform air field air duct based on big data analysis and the description part thereof are shown. At the same time, the air volume is measured in real time by using at least one data average wind speed value point air volume flow meter arranged in the cross section of the air duct, and then the measured average wind speed value point wind speed measurement value is added and divided by the number of average wind speed value point or the geometric average pressure of the data average wind speed value point air volume flow meter to obtain the average wind speed value Fpps of the data average wind speed value point of the air duct. Then, the difference between the data average wind speed value Fdps and the average wind speed value Fpps of the data average wind speed value point of the air duct is calculated. When the difference is greater than the predetermined measurement error value, a warning signal is output and the data average wind speed value Fdps of the air duct is used. When the difference is less than the predetermined measurement error value, a normal signal is output and one of the data average wind speed value Fdps of the air duct and the average wind speed value Fpps of the data average wind speed value point of the air duct is used. When the difference is greater than the predetermined measurement error value, a warning signal can also be output, and the setting position of the data average wind speed value point air volume flow meter is manually or automatically adjusted. The predetermined measurement error value is not greater than 2% (i.e. the second precision requirement of industrial air volume measurement).

[0090] Of course, in order to ensure the reliability of the air volume measurement result of the air duct, the air volume measurement system based on big data analysis and the air volume measurement system based on the setting of the data average wind speed value point air volume flow meter can also be operated simultaneously to verify each other and ensure the reliability and accuracy of the air volume measurement of the air duct.

[0091] Simulation experiment

[0092] Based on the above-mentioned air volume measurement system of the big data air volume dynamic latitude and longitude sensing device, the rectangular air duct in the simulation experiment simulates the rectangular air duct of a 300 MW coal-fired thermal power unit, and the following simulation air volume measurement experiment is performed:

[0093] (I) Introduction of the simulation experiment system:

[0094] For example, Figure 3 and 4 are schematic diagrams of the simulated air duct structure of the air volume measurement system based on big data analysis. The simulated air duct section is a 300 MW coal-fired power unit entering the primary hot air rectangular air duct section of the ball mill 10. The actual air duct and the simulated air duct have a simulation ratio of 2:1. At the same time, the expansion joint A 11, the expansion joint B 12, the cold air pipe 13, the cold air outlet 14, the shut-off valve 15, the regulating valve 16 and the expansion joint C 17 in the actual air duct are cancelled, and a simple structure simulation air duct is made. At the same time, a fan is arranged at the primary hot air inlet, and a big data air volume dynamic latitude and longitude sensing device (i.e. Figure 1 and 2The large data wind volume dynamic latitude and longitude sensing device) shown; 0.00, 2.235, 6.10, 8.30 in the figure are 0.00 meters, 2.235 meters, 6.10 meters, and 8.30 meters in elevation, respectively.

[0095] According to the simulated air duct wind speed requirements, the fan is selected: Shanghai Halong Fan Electric Co., Ltd. Fan model 4-72, air volume 10562-3712 m 3 / h, full pressure 1673 / 2554 Pa, and configure its frequency modulation and speed regulation device: ABB frequency converter product model ACSS10, which meets the 25-100% wind speed adjustment range; At the same time, according to the size of the simulated air duct cross section, the above-mentioned large data wind volume dynamic latitude and longitude sensing device of appropriate size is designed and installed on the cross section in the simulated air duct, wherein the wind volume flow meter type specification: AFM-110 type plug-in multi-throat flow measurement device (i.e. wind volume flow meter), and the ROSEMOUNT 3051 CD0A02A1A1H2B3M5 series intelligent differential pressure transmitter (i.e. wind volume transmitter) connected therewith are selected, range: 0-5171KPa, power supply: 10.5-55VDC, serial number: 27315068110, calibration: 0-747Pa, output 4-20mA; Control monitoring analysis unit A includes: 1) one latitude and longitude movement control data storage box, specification: Coolme CM6024, 2) one Lenovo notebook and one wind volume measurement cross section flow field visualization analysis and optimization point selection software. The differential pressure transmitter transmits the wind volume measurement value data of each preset point corresponding to the load value of the monitored air duct to the latitude and longitude movement control data storage box through the data line, and transmits the load value, preset point and corresponding wind volume measurement value in the latitude and longitude movement control data storage box to the Lenovo notebook one by one and uses the wind volume measurement cross section flow field visualization analysis and optimization point selection software to perform big data analysis and processing.

[0096] (II) Simulation experiment measurement process and results:

[0097] 1) First, set the preset point number on the measured cross section of the control monitoring analysis unit A: the intersection of the x and y axes on the measured cross section of the simulated air duct is the preset point: 20 lines on the x axis and 6 lines on the y axis, a total of 120 preset points.

[0098] 2) Wind speed samples were taken at the preset points on the measured cross-section under load values ​​of 33%, 41.7%, 58.3%, 70%, 87.6%, and 100%. The wind speed electrical signals at each preset point were transmitted to the control, monitoring, and analysis unit A via an air volume transmitter to form a database. After all the pre-selected load samples were completed, the database was imported into the "Air Volume Measurement Cross-Section Flow Field Visualization Analysis and Optimization Point Selection Software" for analysis and processing to generate a three-dimensional cross-section-wind speed peak diagram. This allows for a direct visualization of the wind speed at different locations on the measured cross-section under the same load value. Figure 5 a~ Figure 5 f represents the 3D airflow measurement curves of the airflow measurement system when the load values ​​are 33%, 41.7%, 58.3%, 70%, 87.6%, and 100%, respectively.

[0099] 3) Simultaneously, the control monitoring and analysis unit uses image observation and big data calculation to select the average wind speed points for the data: the sum of the wind speeds measured at all 120 preset points under a certain load value, divided by 120, yields the average wind speed value for that load value; the average wind speed error of the set duct data is gradually increased to 0, 1 / 4500, 2 / 4500, 3 / 4500, 4 / 4500… (where 4500 is the maximum wind speed value measured in the simulated duct), confirming several common preset points corresponding to the wind speed values ​​of the preset points that fall within the set average wind speed error of the duct data under the measured load value, i.e., the pre-selected points for the average wind speed value (at least one), such as… Figure 6 The figure shows a 3D curve of the average wind speed points selected when the average wind speed error of the set data of the wind volume measurement system based on big data analysis in the simulated wind duct section is 6 / 4500. The five black dots in the figure are the pre-selected points for the average wind speed values ​​of the five data points when the average wind speed error of the set wind duct data is 6 / 4500.

[0100] (III) Analysis of Simulation Experiment Data:

[0101] Of course, the location of the average wind speed value of the cross-section data measured by the above simulated wind duct experiment is affected by the limitations of the simulation ratio and the actual equipment, support, and online sampling in load adjustment within the actual wind duct. Therefore, it is necessary to set up an air volume measuring instrument at the corresponding location of the actual measured wind duct cross-section to measure the wind speed and compare it with the air volume measurement results of the simulated wind duct experiment. Then, the air volume measurement system composed of dynamic latitude and longitude sensors based on big data air volume measurement is installed on the actual wind duct cross-section to correct or verify it, so as to meet the accuracy requirements of wind duct air volume measurement.

[0102] Although the above experiment is aimed at the simulation of air duct air volume measurement experiment, it is completely feasible to use the above device and method in the actual non-uniform wind field air duct, because the air duct simulation experiment only scales down the actual air duct in proportion, and even if the actual air duct is complex, but the wind speed measurement graph of all non-uniform wind field air ducts is an irregular 3D surface, as long as the data average wind speed value points in the air duct cross section can be accurately found (that is, a group of such positions can be found within the reasonable range of air volume measurement error).

[0103] The technical scheme of the present application finds the data average wind speed value points in the air duct cross section by simulating the experiment or actually measuring the air volume of the air duct, and then sets up an air volume flow meter at the data average wind speed value points. Compared with the existing air volume measurement technology, the present application has a target and sets points, overturns the concept that the geometric average wind speed value represents the actual wind speed value, and greatly improves the precision of the air volume measurement system.

[0104] Embodiment two

[0105] The large data air volume dynamic latitude and longitude sensing device in a rectangular air duct provided in this embodiment is an optimization based on embodiment one, and the difference is that in embodiment one, the latitude from the dynamic air volume sensing part includes a plurality of air volume flow meters uniformly arranged on the horizontal part body. In this way, the horizontal rotating part in embodiment one, i.e., the horizontal stepping motor, the upper fixed pulley, the left and right angle fixed pulleys, the left and right horizontal fixed pulleys, and the horizontal transmission wire therebetween, can be cancelled. In this way, the required time for air volume monitoring of the entire air duct under a certain specific load value can be greatly shortened, the sampling period T can be reduced, and the real-time performance of the air volume measurement can be ensured. The remaining parts refer to the corresponding contents of embodiment one.

[0106] The rectangular air duct air volume measurement system composed of the large data air volume dynamic latitude and longitude sensing device further includes the same number of air volume transmitters as the number of air volume flow meters in the large data air volume dynamic latitude and longitude sensing device, or one air volume transmitter, and a control monitoring and analysis unit A for controlling and monitoring the large data air volume dynamic latitude and longitude sensing device. In order to accurately measure the air volume or accurately locate the data average wind speed value points, the number of air volume transmitters is the same as the number of air volume flow meters, and they are respectively connected in communication. Of course, in order to more accurately measure the air volume in the air duct, the positive and negative pressure sampling holes of the air volume flow meters can be respectively connected to a positive pressure equalizing pipe and a negative pressure equalizing pipe, and then connected to an air volume transmitter through the positive and negative equalizing pipes.

[0107] Similarly, based on the large data wind volume dynamic latitude and longitude sensing device in the rectangular air duct, the embodiment also provides a large data analysis based wind volume measurement method for the non-uniform wind field air duct, a method for determining the data average wind speed value point position through the large data analysis based wind volume measurement method for the non-uniform wind field air duct, a wind volume measurement system based on the data average wind speed value point position setting wind volume flow meter, a large data analysis based wind volume measurement system for the non-uniform wind field air duct, and a correction system and method combining the large data analysis based wind volume measurement system and the wind volume measurement system based on the data average wind speed value point position setting wind volume flow meter. For the corresponding contents, refer to the corresponding parts of Embodiment One.

[0108] Embodiment Three

[0109] The embodiment provides a large data wind volume dynamic axial radial sensing device in a circular air duct. As shown in FIGS. 10 and 11, the large data wind volume dynamic axial radial sensing device is arranged in the structure of the circular air duct. The large data wind volume dynamic sensing device is a large data wind volume dynamic axial radial sensing device. The large data wind volume dynamic axial radial sensing device is arranged in a certain cross section of the circular air duct 1´. The large data wind volume dynamic axial radial sensing device includes an axial sensing active part 5 and a radial driven wind volume sensing part 6, an axial sensing active part driving part, the axial sensing active part driving part includes an axial transmission part 7-1 and an axial driving part for driving the axial sensing active part. The radial driven wind volume sensing part 6 includes a radial dynamic wind volume sensing part 6-1 and a radial rotating part 6-2 for moving the radial dynamic wind volume sensing part back and forth in the radial direction of the air duct on the axial sensing active part.

[0110] The axial sensing active part 5 includes an axial sensing active part body 5-1. The cross section of the axial sensing active part body is a C-shaped structure. The opening is located on the right side surface, and the inner bottom surface is provided with a transverse track A 5-1-1. The radial rotating part 6-2 includes a central fixed pulley 6-2-1 and a circumferential fixed pulley 6-2-2 arranged at both ends of the axial sensing active part body 5-1, a dynamic radial transmission wire 6-2-3 between the central fixed pulley 6-2-1 and the circumferential fixed pulley 6-2-2, a static transmission part 6-2-4 for driving the central fixed pulley to rotate, and a radial stepping motor for driving the static transmission part. The radial dynamic wind volume sensing part 6-1 is fixed on the opening side surface of the axial sensing active part body 5-1 and is provided with the dynamic radial transmission wire 6-2-3.

[0111] The axial transmission part 7-1 includes an axial transmission part body 7-1-1 with an I-shaped cross section, and a center inner fixed pulley 7-1-2, a right end inner fixed pulley 7-1-3 and a static axial transmission wire 7-1-4 between them which are respectively arranged at the center of the circular air duct and the right end of the axial transmission part body 7-1-1; the axial transmission part body 7-1-1 is fixed at the left and right walls of the circular air duct through the center of the circular air duct, and the right end of the axial transmission part body 7-1-1 extends out of the wall of the air duct; the axial driving part is an axial stepping motor which is fixed on the axial transmission part body 7-1-1 and drives the right end inner fixed pulley 7-1-3 through a shaft;

[0112] The axial sensing active part body 5-1 is further provided with a sleeve 5-1-2 at the center point of the air duct; one end of the sleeve is fixed on the axial sensing active part body at the center point of the circular air duct, and the other end is fixed between the inner and outer bearings of the vertical I-shaped structure of the axial transmission part body 7-1-1; the inner wall of the center inner fixed pulley 7-1-2 is embedded in the outer wall of the sleeve;

[0113] The static transmission part 6-2-4 includes a center outer fixed pulley 6-2-6 and a right end outer fixed pulley which are respectively arranged at the center of the circular air duct and the right end of the axial transmission part body 7-1-1, and a static radial transmission wire between them; the radial stepping motor is fixed on the axial transmission part body 7-1-1 and drives the right end outer fixed pulley through a shaft; the center outer fixed pulley 6-2-6 drives the center fixed pulley 6-2-1 to rotate through a connecting shaft, and the connecting shaft between the center outer fixed pulley and the center fixed pulley is embedded in the inner bearing.

[0114] The radial dynamic air volume sensing part 6-1 includes a slider A 6-1-1 sliding along the transverse track A 5-1-1, and an air volume flow meter A 6-1-2 fixed on the slider A 6-1-1 and located above the C-shaped structure of the axial sensing active part body.

[0115] The circular air duct air volume measurement system composed of the above-mentioned big data air volume dynamic axial radial sensing device further includes an air volume transmitter connected with the air volume flow meter A in the big data air volume dynamic axial radial sensing device, and a control monitoring analysis unit A for controlling and monitoring the big data air volume dynamic axial radial sensing device.

[0116] As Figure 7 , the embodiment based on the above-mentioned circular air duct air volume measurement system provides a non-uniform wind field air duct air volume measurement method flow chart, the steps are as follows:

[0117] 1) Set the angle displacement of the air flow meter A in the axial and radial directions in the control monitoring analysis unit A (i.e., set the angle displacement of the air flow meter A in the radial and axial directions in the control monitoring analysis unit A, respectively, and set the size of the angle displacement and the linear displacement of the radial and axial step motors, respectively; the angle displacement in the two directions can be the same or different);

[0118] 2) The control monitoring analysis unit A controls the air flow meter A to move axially by a preset angle displacement from the initial position, and then controls the air flow meter A to measure the wind speed values (i.e., differential pressure values) of all preset points in the radial direction one by one, while sending the measured air flow to the air flow transmitter, and then storing the air flow electric signal in the control monitoring analysis unit A (i.e., the control monitoring analysis unit A controls the axial step motor to move by a preset angle displacement, and then controls the radial step motor to drive the air flow meter A in the radial rotating part 6-2 to measure the wind speed values (i.e., differential pressure values) of all preset points in the radial direction one by one, while sending the measured wind speed values (i.e., differential pressure values) of the corresponding preset points to the air flow transmitter, and then storing the air flow electric signal in the control monitoring analysis unit A);

[0119] 3) Then, the control monitoring analysis unit A controls the air flow meter A to move axially by a preset angle displacement, and the step 2 is repeated until the air flow meter A measures the wind speed values of all preset points in the entire circular air duct;

[0120] 4) The control monitoring analysis unit A adds up the wind speed measurement values of all preset points and divides the sum by the number of preset points, and then obtains the average wind speed value of the air duct data in the sampling period T, which is the air flow measurement value of the air duct.

[0121] The wind speed measurement of all preset points in the entire circular air duct requires a sampling period T, but the size of the sampling period T is determined by the speed of the axial step motor and the radial step motor, the size of the circular air duct, the number of preset points in the circular air duct, the size of the wind speed in the circular air duct, and other factors. The shorter the sampling period T, the more accurate the average wind speed value of the air duct data. However, under the condition that the load value of the air duct is constant, the average wind speed value of the air duct data is independent of the size of the sampling period T.

[0122] The interval of the preset points is determined by the size of the air duct, the complexity of the wind field, and the accuracy of the air flow measurement.

[0123] As Figure 8 , the embodiment based on the above-mentioned circular air duct air flow measurement system also provides a method for determining the data average wind speed value point of the air flow measurement method of the above-mentioned non-uniform wind field air duct, and the steps are as follows:

[0124] 1) Set the angle displacement of the air flow meter A in the axial and radial directions in the control monitoring analysis unit A (i.e. set the angle displacement of the air flow meter A in the radial and axial directions in the control monitoring analysis unit A, i.e. set the angle displacement of the radial stepper motor and the axial stepper motor, respectively; the angle displacement in the two directions can be the same or different);

[0125] 2) The control monitoring analysis unit A collects the specific load value of the air duct;

[0126] 3) The control monitoring analysis unit A controls the air flow meter A to move axially from the initial position by a preset angle displacement, and then controls the air flow meter A to measure the wind speed value (i.e. differential pressure value) of all preset points in the radial direction one by one, while sending the measured air flow of the corresponding preset point to the air flow transmitter, and then storing the air flow electric signal, its position signal and specific load value one by one in the control monitoring analysis unit A (i.e. the control monitoring analysis unit A controls the axial stepper motor to move by a preset angle displacement, and then controls the radial stepper motor to drive the air flow meter A in the radial rotating part 6-2 to measure the wind speed value (i.e. differential pressure value) of all preset points in the radial direction one by one, while sending the measured air flow of the corresponding preset point to the air flow transmitter, and then storing the air flow electric signal, its position signal and specific load value one by one in the control monitoring analysis unit A);

[0127] 4) The control monitoring analysis unit A controls the air flow meter A to move axially by a preset angle displacement, and the step 3 is repeated until the air flow meter A measures all preset point wind speed values in the circular air duct;

[0128] 5) Adjust the air duct load value (such as 35%, 40%, 50%, 60%, 70%, 80%, 90%, 100%) one by one in step 2; repeat steps 2, 3 and 4 until all preset point wind speed values under the monitored air duct load value (i.e. select the load value in the range of the allowable air duct load value, such as 35%, 40%, 50%, 60%, 70%, 80%, 90%, 100% load) are measured;

[0129] 6) The control monitoring analysis unit A respectively accumulates all preset point wind speed values under different load values of the monitored air duct, and then divides the preset point number to calculate the average wind speed value under each load value, and gradually increases the set air duct data average wind speed error from zero until at least one common preset point is determined. The wind speed measurement value of the common preset point is within the range of the sum of the average wind speed error of the set air duct data after the average wind speed value under each load value is increased.

[0130] In addition, the embodiment provides a wind volume measurement system based on data average wind speed value point setting of air volume flow meter. Air volume flow meters are arranged at each data average wind speed value point determined according to the method for determining data average wind speed value point. Since the wind speed values measured at each data average wind speed value point are basically consistent, air flow is hardly generated between the air volume flow meters at each data average wind speed value point. The wind speed values measured by the air volume flow meters at each data average wind speed value point are connected to an air volume transmitter after pressure equalization, and then connected to control monitoring analysis unit A to form a wind volume measurement system based on data average wind speed value point setting of air volume flow meter. Of course, the air volume flow meters at each data average wind speed value point can also be respectively connected to an air volume transmitter, so that the wind volume measurement system can measure the wind volume value more accurately.

[0131] Since the wind field of the air duct under different load values is a non-uniform wind field, the specific common point of the data average wind speed value in the cross section of the air duct can be accurately found by the above method, and the air volume flow meter can be arranged at the point to accurately measure the air volume of the air duct in real time.

[0132] Secondly, based on the wind volume measurement system based on big data analysis and the wind volume measurement system based on data average wind speed value point setting of air volume flow meter, the embodiment further provides a correction system combining the wind volume measurement system based on big data analysis and the wind volume measurement system based on data average wind speed value point setting of air volume flow meter. The correction system comprises a big data wind volume dynamic axial radial sensing device arranged in the cross section of the air duct and at least one air volume flow meter arranged at a data average wind speed value point on the cross section of the air duct, and air volume transmitters and control monitoring analysis units respectively connected to them. Of course, in order to ensure the reliability of the air volume measurement result of the air duct, the correction system can also simultaneously run the wind volume measurement system based on big data analysis and the wind volume measurement system based on data average wind speed value point setting of air volume flow meter, one standby one use to ensure the reliable and accurate air volume measurement of the air duct.

[0133] Finally, based on the correction system, the embodiment further provides a correction method combining the wind volume measurement system based on big data analysis and the wind volume measurement system based on data average wind speed value point setting of air volume flow meter, as shown in Figure 9 The method is as follows: the air volume flow meter A in the big data wind volume dynamic axial radial sensing device arranged in the cross section of the air duct performs full-range dynamic point-by-point wind speed measurement at a preset point interval in each sampling period, and then the wind speed measurement values of all the preset points are added and divided by the preset point number to obtain the data average wind speed value Fdps of the air duct (for details of the specific wind volume measurement method, see Figure 7The flow chart of the method for measuring the wind volume based on big data analysis of a non-uniform wind field air duct and its explanation part are shown; at the same time, the wind volume flow meter is used to measure the wind volume in real time by setting at least one data average wind speed value point in the cross section of the air duct, and then the measured average wind speed value point wind speed measurement value is accumulated and divided by the number of average wind speed value points or the geometric average pressure to obtain the average wind speed value Fpps of the data average wind speed value point of the air duct; then the difference between the data average wind speed value Fdps of the air duct and the average wind speed value Fpps of the data average wind speed value point of the air duct is calculated; when the difference is greater than the predetermined measurement error value, an early warning signal is output and the data average wind speed value Fdps of the air duct is used; when the difference is less than the predetermined measurement error value, a normal signal is output and one of the data average wind speed value Fdps of the air duct and the average wind speed value Fpps of the data average wind speed point of the air duct is used. When the difference is greater than the predetermined measurement error value, an early warning signal can also be output, and the setting position of the data average wind speed value point wind volume flow meter A is adjusted manually or automatically. The predetermined measurement error value is not greater than 2% (i.e. the second level requirement of industrial measurement accuracy).

[0134] Of course, in order to ensure the reliability of the air duct wind volume measurement result, the big data analysis based wind volume measurement system and the wind volume measurement system based on the data average wind speed value point setting wind volume flow meter can also be operated simultaneously to verify each other and ensure the reliability and accuracy of the air duct wind volume measurement.

[0135] Example Four

[0136] The big data wind volume dynamic shaft radial sensing device in the circular air duct provided in this embodiment is an optimization based on example three, and the difference is that the radial driven wind volume sensing part in this embodiment three includes a plurality of wind volume flow meters A radially and uniformly arranged on the axial sensing driving part body. In this way, the radial rotating part 6-2 in example three can be cancelled, which can greatly shorten the required time for monitoring the entire air duct wind volume under a certain load value, reduce the sampling period T, and ensure the real-time measurement of the wind volume; the rest is referred to the corresponding content of example three.

[0137] The circular air duct wind volume measurement system composed of the above-mentioned big data wind volume dynamic sensing shaft radial device also includes a wind volume transmitter connected with the plurality of wind volume flow meters A in the big data wind volume dynamic shaft radial sensing device respectively, and a control monitoring analysis unit A for controlling and monitoring the big data wind volume dynamic shaft radial sensing device. In order to accurately measure the wind volume or accurately position the data average wind speed value point, the number of wind volume transmitters is the same as the number of wind volume flow meters A and is respectively communicated; of course, in order to more accurately measure the wind volume, the positive and negative pressure sampling holes of the wind volume flow meters A can be respectively communicated on a positive pressure equalizing pipe and a negative pressure equalizing pipe, and then communicated with a wind volume transmitter through the positive and negative pressure equalizing pipes.

[0138] Similarly, based on the large data wind volume dynamic shaft radial sensing device in the circular air duct, the embodiment also provides a wind volume measurement method of a non-uniform wind field air duct, a method for determining a data average wind speed value point position through the wind volume measurement method of the non-uniform wind field air duct, a wind volume measurement system based on a data average wind speed value point position wind volume flowmeter, and a correction system and method based on a large data wind volume measurement system and a data average wind speed value point position wind volume flowmeter wind volume measurement system, and the corresponding contents are referred to the corresponding parts of Embodiment Three.

[0139] The wind volume flowmeter in the large data wind volume dynamic sensing device in the application is an AFM-110 type plug-in multi-throat diameter flow measurement device, and other Venturi type wind volume flowmeters, such as single-throat diameter pipes, double-throat diameter pipes, multi-throat diameter pipes, and Pitot tube wind volume flowmeters, can also be selected.

[0140] If the large data wind volume dynamic sensing device in the application is installed in a dust air duct, a reverse blowing device for measuring a gas pipeline in Chinese Patent CN111520611A can be used to solve the problem that the wind volume flowmeter in the large data wind volume dynamic sensing device is blocked by dust, resulting in inaccurate air duct wind volume measurement.

[0141] The above embodiments are described with respect to the large data air volume dynamic sensing device designed for specific shapes of air ducts, such as rectangular and circular shapes. However, it should be understood that the inventive point of the present application is that the large data air volume dynamic sensing device presets the number of uniformly distributed preset points in the air duct, measures the wind speed in all directions within the cross section of the air duct, and performs massive data monitoring and analysis to obtain the average wind speed value of the air duct and the corresponding point (of course, the preset points can also be uniformly distributed in the air duct as long as the average wind speed value and the point can be found by measuring the wind speed in all directions). The air volume measurement system and method, correction system and method are formed by the air volume flow meter and the like. The purpose is to find the data average wind speed value by sampling and analyzing the large data, and to replace the geometric average wind speed value in the prior art with the data average wind speed value to accurately measure the air duct wind speed. The function is to solve the problem of inaccurate air volume measurement in the prior art, greatly improving the accuracy of air volume measurement of the air duct. The effect is to more accurately achieve the best air-coal ratio requirement of the coal-fired boiler. In this way, (1) safety: by improving the real-time accuracy of the operation of the boiler air volume measurement, the safety of the operation is greatly improved; (2) energy saving: without excess air entering, the continuous exhaust loss is reduced, which improves the boiler combustion efficiency; (3) environmental protection: the over-oxygen environment in the furnace is eliminated, and the generation of nitrogen oxides is prevented at the center of the furnace at a high temperature of 1200°, which greatly reduces air pollution; (4) improve the flexibility of the coal-fired generating unit: precise oxygen supply can greatly improve the flexibility of the generating unit and earn additional electricity price subsidies. Although the above effects only describe the effects of the technical solution of the present application applied to the air duct of the coal-fired boiler, of course, the technical solution of the present application is also feasible for other air ducts that require accurate air volume measurement. Those skilled in the art can make changes or improvements to the present application without deviating from the above inventive point of the present application.

Claims

1. A wind measurement system based on big data analysis, characterized by, The large data air volume dynamic sensing device is arranged in the non-uniform wind field air duct cross section, and at least one large data air volume dynamic sensing device and an air volume transmitter connected therewith are arranged in the air duct cross section.

2. The wind measurement system of claim 1, wherein, The large data air volume dynamic sensing device includes a sensing driving part and a driven air volume sensing part, a sensing driving part driving part, the sensing driving part driving part includes a transmission part and a driving part for driving the sensing driving part; the driven air volume sensing part includes a dynamic air volume sensing part and a rotating part for moving the dynamic air volume sensing part back and forth on the sensing driving part; or the driven air volume sensing part includes a plurality of air volume flow meters uniformly arranged on the sensing driving part.

3. The wind measurement system of claim 1 or 2, wherein, The large data air volume dynamic sensing device is a large data air volume dynamic warp and weft sensing device, which includes a warp sensing driving part and a weft driven air volume sensing part, and a warp sensing driving part driving part.

4. The wind measurement system of claim 3, wherein, The weft driven air volume sensing part includes a weft dynamic air volume sensing part and a transverse rotating part for moving the weft dynamic air volume sensing part back and forth in the air duct transversely on the warp sensing driving part.

5. The wind measurement system of claim 4, wherein, The weft dynamic air volume sensing part includes a slider and an air volume flow meter fixed thereon.

6. The wind measurement system of claim 3, wherein, The weft driven air volume sensing part includes a plurality of air volume flow meters uniformly arranged on the warp sensing driving part.

7. The wind measurement system of claim 6, wherein, The number of air volume transmitters is the same as the number of air volume flow meters, and each air volume transmitter is respectively connected to a sampling pipe, or the air volume flow meters are connected to an air volume transmitter through positive and negative pressure equalizing pipes.

8. The wind measurement system of claim 5 or 6 or 7, wherein, The air volume flow meter is at least one of a pitot tube air volume flow meter and a venturi type air volume flow meter.

9. The wind measurement system of claim 8, wherein, The venturi type air volume flow meter is at least one of a single throat diameter pipe air volume flow meter, a double throat diameter pipe air volume flow meter and a multi-throat diameter pipe air volume flow meter.

10. The wind measurement system of claim 4 or 5, wherein, The warp sensing driving part includes a transverse part and a vertical part, the transverse part body cross section is a reverse C-shaped structure, the vertical part body is a long strip-shaped closed shell, and the transverse part body and the vertical part body are welded together to form a reverse T-shaped structure; the transverse rotating part includes left and right transverse fixed pulleys respectively arranged at both ends of the transverse part body and partially exposed on the top surface of the transverse part body, left and right corner fixed pulleys respectively arranged on the inner sides of the lower ends of the vertical part body, an upper fixed pulley arranged on the inner side of the upper end of the vertical part body, a transverse rotating steel wire wound on the left and right transverse fixed pulleys, the left and right corner fixed pulleys and the upper fixed pulley, and a transverse stepping motor for driving the upper fixed pulley; the weft dynamic air volume sensing part is fixed on the lower end of the transverse part body and arranged on the transverse rotating steel wire.

11. The wind measurement system of claim 10, wherein, The vertical transmission part includes a vertical transmission part body and upper and lower fixed seats respectively arranged on the upper and lower ends of the vertical transmission part body and provided with bearings, and a vertical screw rod fixed in the bearings of the upper and lower fixed seats; the upper end of the transverse part body is further provided with a nut threadedly connected with the vertical screw rod, and the driving part is a vertical stepping motor fixed on the upper end surface of the vertical transmission part body and axially driving the vertical screw rod.

12. The air volume measuring system according to claim 6 or 7, wherein The axial sensing active part comprises a transverse part and a vertical part, the transverse part is a reverse C-shaped structure in cross section, the vertical part is a long strip-shaped closed shell, the transverse part and the vertical part are welded together to form a reverse T-shaped structure; the air volume flowmeter is fixed at the lower end of the transverse part.

13. The wind measurement system of claim 12, wherein, The vertical transmission part comprises a vertical transmission part body and upper and lower fixed seats with bearings respectively arranged at the upper and lower ends of the vertical transmission part body, and a vertical screw fixed in the bearings of the upper and lower fixed seats; the upper end of the transverse part body is further provided with a nut threadedly connected with the vertical screw; the driving part is a vertical stepping motor fixed on the upper end surface of the vertical transmission part body and axially driving the vertical screw.

14. The wind measurement system of claim 1 or 2, wherein, The big data air volume dynamic sensing device is a big data air volume dynamic axial radial sensing device, which comprises an axial sensing active part, a radial driven air volume sensing part, and an axial sensing active part driving part; the axial sensing active part driving part comprises an axial transmission part and an axial driving part for driving the axial sensing active part.

15. The wind measurement system of claim 14, wherein, The radial driven air volume sensing part comprises a radial dynamic air volume sensing member and a radial rotating part for moving the radial dynamic air volume sensing member back and forth in the air duct on the axial sensing active part.

16. The wind measurement system of claim 15, wherein, The radial dynamic air volume sensing member comprises a slider A and an air volume flowmeter A fixed on the slider A.

17. The wind measurement system of claim 14, wherein, The radial driven air volume sensing part comprises a plurality of air volume flowmeters A uniformly arranged on the axial sensing active part.

18. The wind measurement system of claim 17, wherein, The number of air volume transmitters is the same as the number of air volume flowmeters A, and each air volume transmitter is respectively connected with an air volume flowmeter A through a sampling pipe, or the air volume flowmeters A are connected with an air volume transmitter through positive and negative pressure equalizing pipes.

19. The wind measurement system of claim 16 or 17 or 18, wherein, The air volume flowmeter A is at least one of a Pitot tube air volume flowmeter and a Venturi type air volume flowmeter.

20. The wind measurement system of claim 19, wherein, The Venturi type air volume flowmeter is at least one of a single throat diameter pipe air volume flowmeter, a double throat diameter pipe air volume flowmeter, and a multi-throat diameter pipe air volume flowmeter.

21. The wind measurement system of claim 15 or 16, wherein, The axial sensing active part comprises an axial sensing active part body, which is a C-shaped structure in cross section, and the opening is located on the right side surface; the radial rotating part comprises a central fixed pulley and a circumferential fixed pulley respectively arranged at the two ends of the axial sensing active part body, a dynamic radial transmission steel wire between the central fixed pulley and the circumferential fixed pulley, a static transmission part for driving the central fixed pulley to rotate, and a radial stepping motor for driving the static transmission part; the radial dynamic air volume sensing member is fixed on the opening side surface of the axial sensing active part body and arranged on the dynamic radial transmission steel wire.

22. The wind measurement system of claim 21, wherein, The axial transmission part comprises an axial transmission part body which is an I-shaped structure in cross section, a central inner fixed pulley arranged at the front side of the axial transmission part body and located at the center of the circular air duct, a right end inner fixed pulley arranged at the right end of the axial transmission part body, and a static axial transmission steel wire between the central inner fixed pulley and the right end inner fixed pulley; the axial transmission part body is fixed at the left and right walls of the circular air duct through the center of the circular air duct, and the right end of the axial transmission part body extends out of the air duct wall; the axial driving part is an axial stepping motor fixed on the axial transmission part body and connected with the right end inner fixed pulley through a shaft. The axial sensing active part body is further provided with a sleeve at the center point of the air duct, one end of the sleeve is fixed on the axial sensing active part body at the center point of the circular air duct, and the other end is fixed between the inner and outer bearings in the vertical rib of the I-shaped structure of the axial transmission part body; the inner wall of the center inner fixed pulley is inlaid on the outer wall of the sleeve; The static transmission part includes a center outer fixed pulley, a right end outer fixed pulley and a static radial transmission steel wire therebetween, which are respectively arranged at the center of the circular air duct at the back side of the axial transmission part body and the right end thereof; the radial stepping motor is fixed on the axial transmission part body and connected to drive the right end outer fixed pulley through a shaft; the center outer fixed pulley is connected to drive the center fixed pulley to rotate through a connecting shaft, and the connecting shaft between the center outer fixed pulley and the center fixed pulley is embedded in the inner bearing.

23. The wind measurement system of claim 17 or 18, wherein, The axial transmission part includes an axial transmission part body with an I-shaped structure in cross section, a center inner fixed pulley, a right end inner fixed pulley and a static axial transmission steel wire therebetween, which are respectively arranged at the center of the circular air duct at the front side of the axial transmission part body and the right end thereof; the axial transmission part body is fixed on the left and right walls of the circular air duct through the center of the circular air duct and extends out of the air duct wall at the right end; the axial driving part is an axial stepping motor, which is fixed on the axial transmission part body and connected to drive the right end inner fixed pulley through a shaft; The axial sensing active part body is further provided with a sleeve at the center point of the air duct, one end of the sleeve is fixed on the axial sensing active part body at the center point of the circular air duct, and the other end is fixed between the inner and outer bearings in the vertical rib of the I-shaped structure of the axial transmission part body; the inner wall of the center inner fixed pulley is inlaid on the outer wall of the sleeve.

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