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CN-224231023-U - Multi-point matrix type square double-venturi structure

CN224231023UCN 224231023 UCN224231023 UCN 224231023UCN-224231023-U

Abstract

The utility model discloses a honeycomb duct which comprises a honeycomb duct arranged and vertically extending into a pipeline to be tested, wherein a purging interface and a differential pressure measuring interface are respectively arranged at the port of the honeycomb duct, a plurality of groups of measuring units for measuring fluid parameters in the honeycomb duct are arranged on the extending end of the honeycomb duct, each group of measuring units respectively comprises a branch pipeline, the branch pipeline is obliquely arranged at the side of the honeycomb duct, one of two measuring devices is respectively arranged at the end of the branch pipeline, one of the two measuring devices is used for measuring negative pressure related parameters and is obliquely arranged along the direction of the pipeline, and the other measuring device is used for measuring positive pressure related parameters and is vertically arranged. The utility model has reasonable structural design, improves the differential pressure value, stabilizes the flow field, solves the problem of blockage, ensures accurate data, reasonably controls the wind-coal ratio of the power plant, realizes cost reduction and efficiency enhancement, and provides powerful support for sustainable development.

Inventors

  • MA BIN
  • LIU LIGUO
  • ZHANG MENG
  • YANG XIAOMING
  • TANG SONG

Assignees

  • 江元(天长)科技股份有限公司

Dates

Publication Date
20260512
Application Date
20250722

Claims (9)

  1. 1. The utility model provides a multiple spot matrix type square double venturi structure, its characterized in that is including and setting up and vertical honeycomb duct (2) that stretches into in pipeline (1) to be measured, the port department of honeycomb duct (2) is provided with purging interface (3) and differential pressure measurement interface (4) respectively, be provided with multiunit measuring unit that is used for carrying out the measurement to fluid parameter in honeycomb duct (2) on stretching into the end of honeycomb duct (2), every measuring unit of group is including branch pipeline (5) respectively, branch pipeline (5) slope sets up in honeycomb duct (2) one side, and one of two kinds of measuring device is installed respectively to the end of branch pipeline (5), and wherein, one kind is used for measuring the negative pressure square venturi (6) of the slope setting of pipeline direction of relevant parameter of negative pressure, and another kind is used for measuring the vertical positive pressure square venturi (7) of setting of positive pressure relevant parameter, and positive pressure square venturi (6) one-to-one and combination.
  2. 2. The multi-point matrix square double venturi structure according to claim 1, wherein the interface axis of the purging interface (3) is parallel to the axis of the flow guiding pipe (2), and the interface axis of the differential pressure measuring interface (4) is perpendicular to the axis of the flow guiding pipe (2).
  3. 3. The multi-point matrix square double-venturi structure according to claim 1, wherein the installation position of the pipeline (1) to be tested is provided with an installation hole, a flange plate is welded at the installation hole position, and the transition part of the extending end of the flow guide pipe (2) is in sealing connection with the pipeline (1) to be tested through a flange and a gasket.
  4. 4. The multi-point matrix square double venturi structure according to claim 1, wherein the cross section of the flow guiding pipe (2) and the cross section of the branch pipe (5) are square.
  5. 5. The multi-point matrix square double venturi structure according to claim 1, wherein the inclination angle between the branch pipe (5) and the flow guiding pipe (2) is 65-85 degrees.
  6. 6. The multipoint matrix type square double-venturi structure according to claim 1, wherein eight groups of measuring units for measuring fluid parameters in the flow guide pipe are arranged on the extending end of the flow guide pipe (2), positive-pressure square venturi tubes (7) and negative-pressure square venturi tubes (6) in the eight groups of measuring units are combined in a one-to-one correspondence mode to form four combinations, and the four combinations are symmetrically arranged on two sides of the flow guide pipe (2).
  7. 7. The multipoint matrix type square double venturi structure according to claim 1, wherein the positive pressure square venturi tube (7) and the negative pressure square venturi tube (6) are arranged on the inner sides.
  8. 8. The multi-point matrix square double-venturi structure according to claim 1, wherein the negative pressure square venturi tube (6) comprises a square pipeline, the middle part of the upper end of the pipeline is communicated with a branch pipeline (5), and a differential pressure sensor for accurately measuring the pressure difference generated by the venturi effect in the pipeline is arranged in the pipeline.
  9. 9. The multi-point matrix square double-venturi structure according to claim 1, wherein the positive pressure square venturi tube (7) comprises square pipelines, upper and lower ports of the square pipelines are respectively provided with inclined ports (8), the direction of the inclined ports (8) faces the direction of air flow entering, the middle part of the inner side of the pipeline is communicated with the branch pipelines (5), and a differential pressure sensor for accurately measuring pressure difference generated by venturi effect in the pipeline is arranged in the pipeline.

Description

Multi-point matrix type square double-venturi structure Technical Field The utility model relates to the technical field of metering device structures, in particular to a multipoint matrix square double-venturi structure. Background The position for measuring the air quantity in the running process of the power plant unit is basically at the positions of primary air, secondary air, returning air, coal sowing air and flue gas, wherein the primary air is also called powder feeding air and is used for providing fuel coal powder for the internal combustion of the boiler, the primary air is divided into cold primary air and hot primary air, the hot primary air is used for ensuring that the coal powder has a certain temperature when entering the boiler, the energy utilization rate is improved, and the cold primary air is used for adjusting the temperature of the hot primary air so as to ensure that the heat exchange effect is maximized. Because the coal mill is provided with a plurality of powder feeding pipelines, the upper straight pipe section is designed to be shorter, besides the impurities of the air and the small amount of coal powder at the outlet of the coal powder pipeline, the primary air volume measurement is very complex; the secondary air is also called combustion-supporting air, and is used for providing oxygen for pulverized coal combustion in the boiler, and is generally blown in from a fan, after passing through an air preheater, the pulverized coal is directly fed into a hearth, and then is gradually mixed with primary air, and because of the air storage, the straight pipe section is more, the air quantity measurement difficulty is small, the return air is that the flue gas with a certain flow rate enters a spiral cyclone separator, the heavy pulverized coal particles fall down and are blown into the boiler by the return air to be fully combusted, and the coal sowing air is that the coal from a coal feeder can be better sowed into the hearth to prevent accumulation, so that the combustion efficiency is improved, and is generally provided by a special coal sowing fan, and the hot primary air is used as the coal sowing air. The common measuring equipment comprises a wing type wind measuring device which is suitable for measuring the wind quantity of primary wind, secondary wind and the like of a boiler, but can generate larger pressure loss, is not energy-saving enough, is difficult to clean after a pressure taking hole is blocked, is widely applied to measuring the wind quantity of the boiler, calculates the wind quantity by measuring the pressure difference of fluid in the pressure measuring device, but has the advantages of overhigh cost and difficult processing of square pipelines when the equipment is selected on the large-diameter pipeline of a power plant, especially the square pipeline, so that the practical application is less, a uniform velocity tube flowmeter (bartype flowmeter) calculates the wind quantity by measuring the multi-point pressure difference of the inner cross section of the pipeline, but has strict requirements on the length of a straight tube section, and the practical situation on site is difficult to meet the requirements, the situation of unstable measurement frequently occurs, a mass flowmeter is used for measuring the wind quantity by utilizing a heat diffusion principle, is relatively suitable for high-temperature high-pressure environment, a gas ultrasonic flowmeter is used for measuring the wind speed by measuring the ultrasonic propagation time difference, and further calculates the wind quantity, and the venturi tube sample, has high selection cost and difficult processing, so that the application is not more, although the uniform velocity measuring device has the problem of measuring the large-diameter uniform velocity and has low measurement accuracy and low measurement accuracy. The difficult problem faced by the power plant air volume measurement is not only reflected in the measuring equipment, but also influenced by various external factors. From the measuring device itself, the problems of clogging and wear are prominent. For example, the primary air and secondary air measuring devices of the coal-fired power station boiler often have the problem of blockage because of the excessively high dust content, which makes it difficult for operators to accurately judge the working condition of the boiler; The limitation of the pipeline arrangement is also an important factor, many power plants are limited by space, the pipeline design is not standard, and the problems of insufficient straight pipe sections, pipeline bending and the like exist; The measurement error and the precision problem are not neglected, the property of the fluid is very complex, the dust content can be changed, the flow rate is unstable, the design of the measuring device is unreasonable, the factors act together to cause larger measurement error, like the primary air volume measuring dev