CN114923744A - Boiler water wall multiple spot local area type on-line sampling and flow regulation and control device - Google Patents

Boiler water wall multiple spot local area type on-line sampling and flow regulation and control device Download PDF

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Publication number
CN114923744A
CN114923744A CN202210393586.7A CN202210393586A CN114923744A CN 114923744 A CN114923744 A CN 114923744A CN 202210393586 A CN202210393586 A CN 202210393586A CN 114923744 A CN114923744 A CN 114923744A
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Prior art keywords
gas
pipe
filter element
sample gas
flow
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Inventor
张寅卯
彭志敏
付福军
张勇飞
卢鑫
石彦鹏
刘阳东
宇鹏
孙昊
强景云
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Inner Mongolia Jingning Thermal Power Co ltd
Tsinghua University
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Inner Mongolia Jingning Thermal Power Co ltd
Tsinghua University
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Priority to CN202210393586.7A priority Critical patent/CN114923744A/en
Publication of CN114923744A publication Critical patent/CN114923744A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N1/2247—Sampling from a flowing stream of gas
    • G01N1/2258—Sampling from a flowing stream of gas in a stack or chimney
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
    • B01D46/62—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in series
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/66—Regeneration of the filtering material or filter elements inside the filter
    • B01D46/70—Regeneration of the filtering material or filter elements inside the filter by acting counter-currently on the filtering surface, e.g. by flushing on the non-cake side of the filter
    • B01D46/72—Regeneration of the filtering material or filter elements inside the filter by acting counter-currently on the filtering surface, e.g. by flushing on the non-cake side of the filter with backwash arms, shoes or nozzles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M5/00—Casings; Linings; Walls
    • F23M5/08—Cooling thereof; Tube walls
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/30—Technologies for a more efficient combustion or heat usage

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Molecular Biology (AREA)
  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

The invention discloses a boiler water wall multipoint local online sampling and flow regulating device which comprises a multipoint local sampling unit, a flue gas filtering unit, a flue gas flow control and monitoring unit and a compressed air source, wherein the multipoint local sampling unit comprises a gas path collecting pipe and a plurality of sample gas pipes arranged in gaps of water wall fins, each sample gas pipe comprises a main sample gas pipe and a plurality of branch gas pipes, and gas flows passing through the branch gas pipes and the main sample gas pipes flow through the gas path collecting pipe and then enter a mixing chamber. The invention realizes the near-wall surface multipoint local on-line sampling of the water-cooled wall by using the multipoint local sampling unit, and the surface is more representative than points and has wider monitoring range. The flue gas flow control and monitoring unit can realize flow regulation of sampled flue gas by a dilution method by regulating the manual pressure regulating valve and the throttle valve, the negative pressure meter and the flowmeter can monitor the flow of the flue gas in real time, and the system has simple gas path regulation and wide flow range and is suitable for various analyzers with different flow requirements.

Description

Boiler water wall multiple spot local area type on-line sampling and flow regulation and control device
Technical Field
The invention relates to the technical field of gas monitoring, in particular to a multi-point local online sampling and flow regulating device for a boiler water wall.
Background
In recent years, China thermal power generating units implement the strictest global emission standard, wherein the concentration of nitrogen oxides is required to be lower than 50mg/Nm 3 In order to meet the requirement of an ultra-low emission policy, the pulverized coal boiler of a thermal power generating unit in China generally adopts a low nitrogen oxide combustion technology to achieve the aim of ultra-low emission of NOx. However, for a high-sulfur lean coal boiler, the contradiction between high-efficiency combustion and low-nitrogen combustion is prominent, the adoption of a graded low-nitrogen combustion technology causes serious local oxygen deficiency of a hearth, although the combustion rate and temperature of a combustion zone can be effectively reduced, and NO is inhibited under the condition of strong reducing atmosphere X The amount of generated coal is reduced, but the reducing atmosphere can cause H under the high-sulfur coal combustion condition 2 The S concentration rises sharply. H 2 S as a strong corrosionWhen the concentration of the sex gas reaches the order of hundred ppm, the sex gas can cause strong high-temperature corrosion to a water-cooled wall, and the high-temperature corrosion is the most serious in an OFA-SOFA area with violent combustion in the furnace. Although the high-temperature corrosion rate of the water-cooled wall can be delayed to a certain degree by adopting spraying at present, the technology cannot fundamentally solve the problem of the water-cooled wall H due to the limitation of spraying materials, processes, service life, cost and other factors 2 S high-temperature corrosion. Meanwhile, the CO concentration and the carbon content of fly ash are increased rapidly under the deep anoxic working condition, the CO volume fraction in the local area of the hearth even reaches over 10 percent, the low NOx combustion technology is over dependent on the over-fire air, the over-fire air regulation and control difficulty is increased, meanwhile, the combustion efficiency of the boiler is reduced due to insufficient combustion, a large amount of energy loss is caused, and the carbon emission reduction pressure is further increased.
Therefore, a multi-component online monitoring system is required to be arranged on the position, close to the wall surface, of the water wall to perform overall regulation and control on the boiler operation system. The prior application of the sampling measurement of the flue gas near the water-cooled wall of a boiler furnace burner area has the following defects: the sampling measurement is generally carried out by using a test hole for periodic sampling measurement, and a sampling measurement device is single-point type, and because a boiler body is large and single-point type representativeness is not strong, the actual working condition of a furnace water-cooled wall cannot be accurately reflected; the holes of the water-cooled wall fins are generally phi 6 mm-phi 10mm, the sampling holes are extremely small, the working conditions in the hearth are severe and complicated, the online sampling device is easy to block due to high-temperature high-dust coking, the stability is poor, the primary filtering precision is low, and an analysis instrument is polluted; the sample gas flow of the dilution method cannot be monitored and controlled in real time and cannot be adapted to various systems and analyzers.
Disclosure of Invention
The present invention is directed to solving, at least in part, one of the technical problems in the related art. Therefore, the embodiment of the invention provides a multi-point local online sampling and flow regulating device for a water wall of a boiler. The online sampling and flow regulation device can realize the flow regulation of the flue gas sampled by local multipoint sampling and dilution method.
The invention provides a multi-point local on-line sampling and flow regulating device for a boiler water wall, which comprises:
the multipoint local sampling unit comprises a gas path collecting pipe and a plurality of sample gas pipes arranged in the gaps of water-cooled wall fins, wherein each sample gas pipe comprises a main sample gas pipe and a plurality of branch pipe;
the flue gas filtering unit is arranged at the downstream of the multipoint local sampling unit and comprises a primary filter element arranged in the mixing chamber and a secondary filter element arranged at the downstream of the primary filter element, and the primary filter element is connected with the secondary filter element in a sealing way;
the flue gas flow control and monitoring unit is arranged at the downstream of the flue gas filtering unit and is used for controlling and monitoring the flue gas flow;
a compressed air source for providing compressed air.
In some embodiments, the gas path collecting pipe includes a main gas path connecting pipe, a branch gas mixing pipe and a first back-blowing pipe, the gas flow passing through the main sample gas pipe enters the mixing chamber through the main gas path connecting pipe, the gas flow passing through the branch gas pipe converges to the branch gas swirling pipe and then enters the mixing chamber through the branch gas mixing pipe, and the first back-blowing pipe is used for cleaning the branch gas pipe.
In some embodiments, a cleaning window is provided at an end of the attachment support bracket.
In some embodiments, a filter element protective shell, a second blowback pipe, a third blowback pipe and a fourth blowback pipe are arranged in the mixing chamber, the filter element protective shell is arranged outside the primary filter element, an air outlet of the second blowback pipe extends into the upper part of the mixing chamber, an air outlet of the third blowback pipe extends into the lower part of the mixing chamber, and an air outlet of the fourth blowback pipe extends into the surface of the primary filter element.
In some embodiments, the second-stage filter element is disposed in a second-stage filter device, the second-stage filter device is further provided with a heating rod, a thermocouple, an internal purging valve and an offline testing hole, the heating rod is used for removing water from the sample gas, the thermocouple is used for testing the temperature of the sample gas, and compressed air passing through the internal purging valve and the offline testing hole is cleaned from the inside of the filter element to the outside of the filter element.
In some embodiments, the thermocouple is electrically connected to a temperature controller for controlling the sample gas temperature.
In some embodiments, the flue gas flow control and monitoring unit is connected to the secondary filtration device by a mount.
In some embodiments, the flue gas flow control and monitoring unit comprises a dilution module, a manual pressure regulating valve, a negative pressure gauge, a throttle valve, a flow meter and a measurement solenoid valve, wherein the manual pressure regulating valve, the negative pressure gauge, the throttle valve, the flow meter and the measurement solenoid valve are all connected with the dilution module through connecting pipes.
In some embodiments, the compressed air generates negative pressure after passing through the dilution module so as to extract the sample gas, the pressure and the flow of the extracted sample gas are adjusted by adjusting the manual pressure regulating valve, and the negative pressure gauge is used for monitoring the pressure and the flow of the extracted sample gas in real time.
In some embodiments, when the measuring electromagnetic valve is closed, the flow of the sample gas in the connecting pipe is accurately controlled by adjusting the throttle valve, and the flow is monitored in real time through the flow meter; when the measuring electromagnetic valve is opened, the measuring value of the flowmeter is reduced, and the sample gas in the connecting pipe enters the measuring instrument.
Compared with the prior art, the invention has the beneficial effects that:
the invention realizes the near-wall surface multipoint local on-line sampling of the water-cooled wall by using the multipoint local sampling unit, and the surface is more representative than points and has wider monitoring range; the design that each branch pipe air current converges back and then converges with main sample gas pipe air current makes the sample gas mixture more even.
The invention utilizes a plurality of back-flushing pipes to realize the back-flushing cleaning of the branch pipe, the main sample gas pipe, the mixing chamber, the primary filter element and the secondary filter element, and prevents the sample gas pipeline from being blocked due to coking and other problems.
The sample gas pipe provided by the invention is reserved with the cleaning window, so that the sampling hole can be cleaned electrically, and the sampling hole can also be cleaned manually, and the sampling hole is prevented from being blocked under the conditions of coking and the like.
The internal purge valve and the off-line test hole of the invention realize the purging and cleaning of the secondary filter element and the primary filter element from the inside of the filter element to the outside of the filter element on one hand, and realize the off-line sampling measurement on the other hand, thereby facilitating the sampling test of an identification department.
The flue gas flow control and monitoring unit can realize flow regulation of sampled flue gas by a dilution method by regulating the manual pressure regulating valve and the throttle valve, the negative pressure meter and the flowmeter can monitor the flow of the flue gas in real time, and the system has simple gas path regulation and wide flow range and is suitable for various analyzers with different flow requirements.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural diagram of a multi-point local online sampling and flow rate control device for a water wall of a boiler;
FIG. 2 is a sectional view of a multi-point local on-line sampling and flow control device for a water wall of a boiler;
FIG. 3 is a structural diagram of a gas path collecting pipe of a multipoint local sampling unit;
FIG. 4 is a cross-sectional view of a gas path collection tube of a multi-point local sampling unit;
FIG. 5 is another cross-sectional view of a gas path manifold of the multi-point local area sampling unit;
fig. 6 is a schematic diagram of sample gas flow monitoring and control.
Description of reference numerals:
the device comprises a water-cooled wall 1, a main sample gas pipe 2, a branch pipe 3, a gas circuit collecting pipe 4, a cleaning window 5, a first back-blowing pipe 6, a mixing chamber 7, a second back-blowing pipe 8, a fourth back-blowing pipe 9, a secondary filtering device 10, a fixing frame 11, a connecting support frame 12, a branch circuit convolution sample gas pipe 13, a graphite sealing ring 14, a main gas circuit connecting pipe 15, a branch circuit mixing pipe 16, a primary filter core 17, a filter core protective shell 18, a third back-blowing pipe 19, a secondary filter core 20, a heating rod 21, an internal purging valve and an offline testing hole 22, a smoke flow control and monitoring unit 23, a thermocouple 24, a manual pressure regulating valve 25, a negative pressure meter 26, a dilution module 27, a throttle valve 28, a flow meter 29, a measuring electromagnetic valve 30 and a connecting pipe 31.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The following describes a boiler water wall multipoint local online sampling and flow rate regulating device provided by the embodiment of the invention with reference to the attached drawings.
As shown in fig. 1-6, the multi-point local online sampling and flow rate control device for a water wall of a boiler of the present invention comprises: the device comprises a multipoint local sampling unit, a smoke filtering unit, a smoke flow control and monitoring unit and a compressed air source.
In some embodiments, the multipoint local sampling unit comprises a gas path collecting pipe 4 and a plurality of sample gas pipes, wherein the sample gas pipes are arranged in the fin gaps of the water wall 1. It can be understood that the setting position of the sample gas pipe is the sampling point, and the plurality of sample gas pipes correspond to the plurality of sampling points.
In some embodiments, the sample gas pipe comprises a main sample gas pipe 2 and a plurality of branch pipes 3, and the main sample gas pipe 2 and the plurality of branch pipes 3 are connected through a connecting support frame 12 so as to support the whole device on the wall of the water cooled wall 1. The tail end of the connecting support frame 12 is provided with a cleaning window 5, the sample gas pipes correspond to the cleaning windows 5 one by one, and the cleaning windows 5 can be cleaned manually or electrically. It will be appreciated that when it is desired to clean the sample gas tube through the cleaning window 5, the cleaning window 5 is opened; in the normal working process, the cleaning window 5 is closed.
In some embodiments, the main sample gas tube 2 is sealingly connected to the gas path manifold 4. It can be understood that the main sample gas pipe 2 is connected with the gas circuit collecting pipe 4 in a sealing way through a sealing ring. The seal ring may be a graphite seal ring 14, but is not limited to a graphite seal ring.
In some embodiments, the gas flow through the bypass tube 3 and the main sample gas tube 2 enters the mixing chamber 7 after flowing through the gas path collecting tube 4. The sample gas collected by the branch pipe 3 and the sample gas collected by the main sample gas pipe 2 are finally mixed in the mixing chamber 7, and the concentration of gas components on the near-wall surface of the water-cooled wall 1 in the boiler can be accurately reflected in a multi-point sampling mode.
In some embodiments, the gas path collecting pipe 4 includes a main gas path connecting pipe 15, a branch mixing pipe 16 and a first blowback pipe 6, the gas flow passing through the main sample gas pipe 2 enters the mixing chamber 7 through the main gas path connecting pipe 15, the gas flow passing through the branch pipe 3 is collected to the branch convolute sample gas pipe 13 and then enters the mixing chamber 7 through the branch mixing pipe 16, and the first blowback pipe 6 is used for cleaning the branch pipe 3.
Specifically, the air flows in the branch pipe 3 are firstly converged at the branch convolute sample air pipe 13, that is, the air flows in the branch pipe 3 are subjected to first mixing, and the mixed air flows in the branch pipe 3 enter the mixing chamber 7 through the branch mixing pipe 16 of the air path collecting pipe 4; the air current of main appearance trachea 2 passes through main gas circuit connecting pipe 15 entering mixing chamber 7 of gas circuit collection pipe 4 to make branch road pipe 3 air current and main appearance trachea 2 air current intensive mixing, make appearance gas more representative. The branch circuit convolution sample gas pipe 13 plays a role in enabling the sample gas of the branch pipe 3 to be converged, and a corresponding branch circuit convolution sample gas pipe structure can be designed according to an actual device.
A first blowback pipe 6 of the gas circuit collecting pipe 4 is used for cleaning the branch pipe 3, one end of the first blowback pipe 6 is connected with a compressed air source, and one end of the first blowback pipe 6, which is far away from the compressed air source, is communicated with the branch pipe 3. It can be understood that, when the branch pipe 3 needs to be cleaned, the first blowback pipe 6 is opened, and the compressed air purges the branch pipe 3 through the first blowback pipe 6, thereby realizing the cleaning of the branch pipe 3.
In addition, preferably, the material adopted by the multipoint local sampling unit has the characteristics of high temperature resistance and wear resistance, and the inner wall is sprayed with an anti-corrosion material.
In a specific embodiment, as shown in fig. 1 and 2, the sample gas tube includes a main sample gas tube 2 and four branch gas tubes 3, the four branch gas tubes 3 are distributed in a square structure, each branch gas tube 3 occupies an end point of the square structure, the main sample gas tube 2 is disposed at a central position of the square structure, and the branch gas tubes 3 and the main sample gas tube 2 are connected by a connecting support frame 12.
In some embodiments, a flue gas filtration unit is disposed downstream of the multi-point local sampling unit, the flue gas filtration unit consisting essentially of a primary filter element 17 and a secondary filter element 20. The first-stage filter element 17 is connected with the second-stage filter element 20 in a sealing manner, and it can be understood that the first-stage filter element 17 is connected with the second-stage filter element 20 in a sealing manner through a sealing ring. The second grade filter core 20 sets up in one-level filter core 17 downstream, and the aperture of second grade filter core 20 is less than the aperture of one-level filter core 17, and it can be understood that, the one-level filter core 17 at first carries out the primary filtration to the flue gas, and the flue gas after the filtration of one-level filter core 17 gets into second grade filter core 20, and second grade filter core 20 carries out the secondary filtration to the flue gas to obtain clean flue gas.
In some embodiments, a primary filter element 17 is disposed within the mixing chamber 7, and the mixed sample gas enters the secondary filter device 10 through the primary filter element 17.
In some embodiments, a filter element protective shell 18, a second blowback pipe 8, a third blowback pipe 19 and a fourth blowback pipe 9 are further arranged in the mixing chamber 7, the filter element protective shell 18 is arranged outside the primary filter element 17, an air outlet of the second blowback pipe 8 extends into the upper portion of the mixing chamber 7, an air outlet of the third blowback pipe 19 extends into the lower portion of the mixing chamber 7, and an air outlet of the fourth blowback pipe 9 extends into the surface of the primary filter element 17.
Specifically, the filter element protective shell 18 is arranged at the outer side of the primary filter element 17, and the filter element protective shell 18 plays a role of protecting the primary filter element 17; one end of the second back-blowing pipe 8 is connected with a compressed air source, one end, far away from the compressed air source, of the second back-blowing pipe 8 extends into the upper part of the mixing chamber 7, and the second back-blowing pipe 8 performs cleaning on the mixing chamber 7 and the main sample gas pipe 2; one end of a third blowback pipe 19 is connected with a compressed air source, one end, far away from the compressed air source, of the third blowback pipe 19 extends into the lower part of the mixing chamber 7, the third blowback pipe 19 arranged at the lower part of the mixing chamber 7 can blow up dust deposited at the bottom of the mixing chamber 7 so as to blow and clean the mixing chamber 7, the third blowback pipe 19 blows and cleans the mixing chamber 7 and the main sample gas pipe 2, and it can be understood that a second blowback pipe 8 and the third blowback pipe 19 are respectively arranged at the upper part and the lower part of the mixing chamber 7 and cooperate to blow and clean the mixing chamber 7 and the main sample gas pipe 2; one end of the fourth blowback pipe 9 is connected with a compressed air source, and one end of the fourth blowback pipe 9, which is far away from the compressed air source, extends into the surface of the first-stage filter element 17, so that the surface of the first-stage filter element 17 is cleaned. In addition, it can be understood that the second blowback pipe 8, the third blowback pipe 19 and the fourth blowback pipe 9 and the mixing chamber 7 can be hermetically connected by graphite sealing rings.
In some embodiments, a secondary filter element 20, a heater rod 21, a thermocouple 24, and an internal purge valve and off-line test hole 22 are disposed in the secondary filter device 10, the heater rod 21 is used for removing water from the sample gas, the thermocouple 24 is used for testing the temperature of the sample gas, and compressed air passing through the internal purge valve and off-line test hole 22 is cleaned from the inside of the filter element to the outside of the filter element.
Specifically, the heating rod 21 removes moisture in the sample gas by heating, so as to ensure the sample gas to be dry; the thermocouple 24 is used for testing the temperature of the sample gas, the thermocouple 24 is electrically connected with a temperature controller (not shown in the figure), and the temperature controller is used for controlling the temperature of the sample gas, so that it can be understood that the temperature of the sample gas is ensured to be constant by the temperature controller and the thermocouple 24, and the test error caused by the temperature of the sample gas is reduced; the internal purge valve and the off-line test hole 22 are communicated with the inside of the secondary filter element 20, on one hand, the internal purge valve and the off-line test hole 22 are utilized to realize the purge and cleaning of the secondary filter element 20 and the primary filter element 17 from the inside of the filter element to the outside of the filter element, and on the other hand, the internal purge valve and the off-line test hole 22 are utilized to realize the sampling measurement in the off-line process.
In some embodiments, the flue gas flow control and monitoring unit is disposed downstream of the flue gas filtering unit, and the flue gas flow control and monitoring unit is connected with the secondary filtering device 10 through a fixing frame 11.
In some embodiments, the flue gas flow control and monitoring unit comprises a dilution module 27, a manual pressure regulating valve 25, a negative pressure gauge 26, a throttle valve 28, a flow meter 29 and a measurement solenoid valve 30, and the manual pressure regulating valve 25, the negative pressure gauge 26, the throttle valve 28, the flow meter 29 and the measurement solenoid valve 30 are all connected with the dilution module 27 through a connecting pipe 31.
Specifically, the manual pressure regulating valve 25, the negative pressure gauge 26, the throttle valve 28, the flow meter 29 and the measuring solenoid valve 30 are all hermetically connected with the dilution module 27 through a connecting pipe 31 by using a ferrule.
In some embodiments, the sample gas is extracted by generating negative pressure after the compressed air passes through the dilution module 27, the pressure and flow rate of the extracted sample gas are adjusted by adjusting the manual pressure adjusting valve 25, and the negative pressure gauge 26 is used for monitoring the pressure and flow rate of the extracted sample gas in real time.
Specifically, the gas supply amount of the flue gas flow control and monitoring unit can be roughly adjusted by adjusting the manual pressure adjusting valve 25, and after the compressed air passes through the diluting module 27, a negative pressure is generated, and the flue gas can be extracted from the hearth through the negative pressure. The negative pressure gauge 26 can monitor the pressure and flow of the extracted flue gas in real time, and the size of the extracted pressure and the size of the flow of the flue gas can be changed in real time through adjusting the manual pressure regulating valve 25.
In some embodiments, when the measuring solenoid valve 30 is closed, the flow rate of the sample gas in the connecting pipe 31 is precisely controlled by adjusting the throttle valve 28 and is monitored in real time by the flow meter 29; when the measuring solenoid valve 30 is opened, the measurement value of the flow meter 29 drops, and the sample gas in the connection pipe 31 enters the measuring instrument.
Specifically, the flow rate of the flue gas in the remaining connection pipe 31 can be further precisely controlled by adjusting the throttle valve 28 with the measuring solenoid valve 30 closed, and can be monitored in real time by the flow meter 29. When the measuring solenoid valve 30 is opened, the flow rate of the flow meter 29 is reduced, and the flow rate of the flue gas in the connecting pipe 31 is supplied to the analyzer for analysis and measurement.
The invention realizes real-time monitoring and regulation of sample gas by using the flue gas flow control and monitoring unit, thereby meeting the requirements of different testing instruments.
The compressed air source of the present invention is used to provide compressed air to the apparatus of the present invention.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms may be directed to different embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. The utility model provides a boiler water-cooling wall multiple spot local area formula is sample and flow regulation and control device which characterized in that includes:
the multipoint local sampling unit comprises a gas path collecting pipe and a plurality of sample gas pipes arranged in the gaps of fins of the water-cooled wall, wherein each sample gas pipe comprises a main sample gas pipe and a plurality of branch pipe;
the smoke filtering unit is arranged at the downstream of the multipoint local sampling unit and comprises a primary filter element arranged in the mixing chamber and a secondary filter element arranged at the downstream of the primary filter element, and the primary filter element is hermetically connected with the secondary filter element;
the flue gas flow control and monitoring unit is arranged at the downstream of the flue gas filtering unit and is used for controlling and monitoring the flow of flue gas;
a compressed air source for providing compressed air.
2. The apparatus of claim 1, wherein the gas path collecting pipe comprises a main gas path connecting pipe, a branch gas mixing pipe and a first back-blowing pipe, wherein the gas flow passing through the main sample gas pipe enters the mixing chamber through the main gas path connecting pipe, the gas flow passing through the branch gas pipe converges to the branch gas swirling-type gas pipe and then enters the mixing chamber through the branch gas mixing pipe, and the first back-blowing pipe is used for cleaning the branch gas pipe.
3. The device of claim 1, wherein a cleaning window is provided at an end of the attachment support frame.
4. The device of claim 1, wherein a filter element protective shell, a second back-blowing pipe, a third back-blowing pipe and a fourth back-blowing pipe are arranged in the mixing chamber, the filter element protective shell is arranged outside the primary filter element, an air outlet of the second back-blowing pipe extends into the upper part of the mixing chamber, an air outlet of the third back-blowing pipe extends into the lower part of the mixing chamber, and an air outlet of the fourth back-blowing pipe extends into the surface of the primary filter element.
5. The apparatus of claim 1, wherein the secondary filter element is disposed within a secondary filter apparatus, the secondary filter apparatus further comprising a heater rod for removing water from the sample gas, a thermocouple for measuring the temperature of the sample gas, and an internal purge valve and an off-line test port, the compressed air passing through the internal purge valve and the off-line test port being purged from the interior of the filter element to the exterior of the filter element.
6. The apparatus of claim 5, wherein the thermocouple is electrically connected to a temperature controller, the temperature controller being configured to control the temperature of the sample gas.
7. The apparatus of claim 5, wherein said flue gas flow control and monitoring unit is connected to said secondary filtration device by a mounting bracket.
8. The apparatus of claim 1, wherein said flue gas flow control and monitoring unit comprises a dilution module, a manual pressure regulating valve, a negative pressure gauge, a throttle valve, a flow meter and a measuring solenoid valve, said manual pressure regulating valve, said negative pressure gauge, said throttle valve, said flow meter and said measuring solenoid valve are all connected to said dilution module by connecting pipes.
9. The apparatus of claim 8, wherein the sample gas is pumped out by generating a negative pressure after the compressed air passes through the dilution module, and the pressure and flow rate of the sample gas are adjusted by adjusting the manual pressure-regulating valve, and the negative pressure gauge is used for monitoring the pressure and flow rate of the sample gas in real time.
10. The device of claim 8, wherein when the measuring solenoid valve is closed, the flow rate of the sample gas in the connecting pipe is precisely controlled by adjusting the throttle valve and is monitored in real time by the flowmeter; when the measuring electromagnetic valve is opened, the measuring value of the flowmeter is reduced, and the sample gas in the connecting pipe enters the measuring instrument.
CN202210393586.7A 2022-04-14 2022-04-14 Boiler water wall multiple spot local area type on-line sampling and flow regulation and control device Pending CN114923744A (en)

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CN202210393586.7A CN114923744A (en) 2022-04-14 2022-04-14 Boiler water wall multiple spot local area type on-line sampling and flow regulation and control device

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CN202210393586.7A CN114923744A (en) 2022-04-14 2022-04-14 Boiler water wall multiple spot local area type on-line sampling and flow regulation and control device

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CN114923744A true CN114923744A (en) 2022-08-19

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