Dynamic measurement system for boiler oxygen content field

Abstract

The utility model discloses a dynamic measuring system for a boiler oxygen field, which is applied to a flue pipe and comprises a driving part arranged on the flue pipe; the scanning assembly is in transmission connection with the driving part, the scanning assembly is movably arranged in the flue pipe, and the driving part is used for driving the scanning assembly to scan the section area of the flue pipe; the plurality of sampling parts are arranged, and the plurality of sampling parts are arranged on the scanning assembly; the plurality of sensing modules are arranged, and the plurality of sensing modules are arranged on the scanning assembly; the measuring module is communicated with the sampling part, the measuring module is used for measuring the content of the gas sample, and the arranged driving part is used for driving the movable scanning assembly, so that the scanning assembly scans the section area of the flue pipe, and the whole oxygen content field dynamic measuring system can cover the space field of the flue section in a large range; the oxygen content result obtained through sampling measurement is more representative, the change condition of the boiler combustion oxygen content can be truly reflected, and boiler operation personnel can conveniently control boiler combustion air distribution.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler flue gas sampling measurement, in particular to a dynamic measurement system for boiler oxygen content field. Background Art

[0002] The oxygen content measurement in a thermal power plant boiler is conventionally carried out by a fixed-point measurement method. This measurement method can only measure the local oxygen content at the position of the sampling head at the vertex. The static point measurement cannot measure the oxygen content change of the entire flue gas flow field. The measured oxygen content is not representative and cannot truly reflect the change of the boiler combustion oxygen content, which is not convenient for the boiler operator to control the boiler combustion air distribution. Content of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a dynamic measurement system for boiler oxygen content field, the measured oxygen content is representative, can truly reflect the change of the boiler combustion oxygen content, and is convenient for the boiler operator to control the boiler combustion air distribution.

[0004] A dynamic measurement system for boiler oxygen content field according to an embodiment of the first aspect of the utility model, which is applied to a flue duct, includes: a driving member disposed on the flue duct; a scanning assembly drivingly connected to the driving member, the scanning assembly being movably disposed in the flue duct, the driving member being configured to drive the scanning assembly to scan a cross-sectional area of the flue duct; a plurality of sampling parts disposed on the scanning assembly; a plurality of sensing modules disposed on the scanning assembly; a measurement module communicating with the sampling parts, the measurement module being configured to measure the oxygen and carbon monoxide contents in a gas sample; a control module electrically connected to the driving member, the sensing module and the measurement module, the control module being configured to analyze signals transmitted from the sensing module and the measurement module and simultaneously control the operation of the driving member.

[0005] A dynamic measurement system for boiler oxygen content field according to an embodiment of the utility model has at least the following beneficial effects: the provided driving member is used to drive the movable scanning assembly, so that the scanning assembly scans the cross-sectional area of the flue duct, enabling the entire dynamic measurement system for oxygen content field to cover a large range of the spatial field of the flue duct cross-section. The oxygen content result obtained by sampling measurement is more representative, can truly reflect the change of the boiler combustion oxygen content, and is convenient for the boiler operator to control the boiler combustion air distribution; in addition, the provided plurality of sampling parts can also increase the number of sampling positions, ensure the diversity of the sampling area, make the measurement result more reliable, and the provided sensing module is used to measure other physical quantities in the flue duct, so as to obtain a more accurate result in the measurement module, which is convenient for the operator to control the combustion air intake.

[0006] According to some embodiments of the utility model, the sensing modules and the sampling parts are arranged alternately, and the alternating arrangement of the sensing modules and the sampling parts makes the sampling positions evenly and discretely distributed, making the sampling detection results more universal and representative.

[0007] According to some embodiments of the utility model, the scanning assembly includes: an extension arm, which is inserted into the flue pipe; a scanning rod, which is rotatably connected to one end of the extension arm, the driving member is transmission-connected to the scanning rod, and the scanning rod extends vertically to the inner bottom of the flue pipe, the sampling part includes a sampling head, and the sensing module includes a temperature sensor, an oxygen sensor, a humidity sensor, a pressure sensor and / or a flow rate sensor, and the sampling head and the sensing module are both arranged on the scanning rod.

[0008] According to some embodiments of the utility model, the driving member includes: a screw mechanism, which is arranged on the flue pipe; the scanning assembly includes: an extension arm, which can be slidably connected to the side wall of the flue pipe, one end of the extension arm is transmission-connected to the screw mechanism, and the screw mechanism is used to drive the extension arm to slide in or out of the flue pipe; a scanning rod, which is connected to the other end of the extension arm, and the scanning rod extends vertically to the inner bottom of the flue pipe, the sampling part includes a sampling head, and the sensor module includes a temperature sensor, an oxygen sensor, a humidity sensor, a pressure sensor and / or a flow rate sensor, and the sampling head and the sensor module are both arranged on the scanning rod.

[0009] According to some embodiments of the utility model, the screw mechanism includes: a mounting seat, which is arranged on the flue pipe; a guide rail, which is arranged on the mounting seat; a slider, which is slidably connected to the guide rail along the extension direction of the guide rail, and the extension arm is connected to the slider, and the slider is used to drive the extension arm to slide; a motor, which is arranged on the mounting seat; a screw rod, which is rotatably connected to the mounting seat, the slider is threadedly connected to the screw rod, the screw rod is transmission-connected to the motor, and the motor is used to drive the screw rod to rotate.

[0010] According to some embodiments of the utility model, the sampling head, the scanning rod and the sensor module are all covered with a wear-resistant layer, and the sampling head is provided with an anti-wear cover. The use of wear-resistant material and the anti-wear cover prevents solid particles in the flue pipe from wearing the sampling head, the scanning rod and the sensor module, in order to extend the service life.

[0011] According to some embodiments of the present invention, it further includes an anti-dust accumulation component. The anti-dust accumulation component includes a flue gas filter element and a back-blowing component. The flue gas filter element is arranged on the sampling head, and the back-blowing component is arranged on the pipeline between the sampling head and the measurement module. The back-blowing component is used to back-blow gas to the sampling head to clean the accumulated dust.

[0012] According to some embodiments of the present invention, the sampling head is arranged at a predetermined angle with the flowing direction of the flue gas in the flue duct, and the air inlet of the sampling head faces the flowing direction of the flue gas, so as to avoid the direct filling of the flue gas in the flue duct into the air inlet of the sampling head.

[0013] According to some embodiments of the present invention, a sealing sleeve is arranged on the side wall of the flue duct. The sealing sleeve is slidably connected to the extension arm, and the sealing sleeve is used to seal the flue duct.

[0014] According to some embodiments of the present invention, both the extension arm and the scanning rod are arranged to be hollow. The sampling head communicates with the inner cavity of the scanning rod, and the inner cavity of the extension arm communicates with the measurement module. The hollow extension arm and scanning rod can not only reduce the weight but also play the role of flue gas conduction.

[0015] The additional aspects and advantages of the present invention will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0017] Figure 1 is a schematic structural diagram of a boiler oxygen content field dynamic measurement system according to an embodiment of the present invention;

[0018] Figure 2 is Figure 1 a schematic structural diagram of the side of the shown boiler oxygen content field dynamic measurement system.

[0019] Crank-rocker mechanism 100a, lead screw mechanism 100b, mounting seat 110, guide rail 120, slider 130, motor 140, lead screw 150;

[0020] Scanning rod 200a, extension arm 200b;

[0021] Sampling part 300, abrasion-proof cover 310;

[0022] Sensing module 400, measurement module 500;

[0023] Flue duct 600, sealing sleeve 610;

[0024] A flue gas filter element 710, a backwashing element 720, and a control module 800. Specific embodiments

[0025] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0026] In the description of the present utility model, it should be understood that with respect to the orientation description, such as the upper, lower, front, rear, left, right, etc., the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model.

[0027] In the description of the present utility model, the meaning of "a number of" is one or more, the meaning of "a plurality of" is two or more, and understandings such as "greater than", "less than", "exceeding", etc. do not include the present number, and understandings such as "above", "below", "within", etc. include the present number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0028] In the description of the present utility model, unless otherwise clearly defined, words such as "set", "installed", "connected", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present utility model in combination with the specific content of the technical solution.

[0029] Refer to Figure 1 and Figure 2A boiler oxygen field dynamic measurement system is applied to a flue pipe 600, comprising: a driving member, arranged on the flue pipe 600; a scanning assembly, which is transmission-connected to the driving member, and the scanning assembly can be movably arranged in the flue pipe, and the driving member is used to drive the scanning assembly to scan the cross-sectional area of ​​the flue pipe 600; a sampling part 300, which is provided with a plurality of sampling parts 300, and a plurality of sampling parts 300 are arranged on the scanning assembly; a sensor module 400, which is provided with a plurality of sensor modules 400, and a measuring module 500, which is connected to the sampling part 300, and the measuring module 500 is used to measure the gas The carbon monoxide content in the sample, the control module 800, the electrically connected drive element, the sensor module 400 and the measuring module 500, the control module is used to analyze the signals transmitted by the sensor module 400 and the measuring module 500, and at the same time control the action of the drive element, the set drive element is used to drive the movable scanning component, so that the scanning component scans the cross-sectional area of ​​the flue pipe 600, so that the whole set of oxygen field dynamic measurement system can cover the spatial field of the flue cross-section in a large range, and the oxygen content result obtained by sampling measurement is more representative, which can truly reflect the change of the oxygen content of the boiler combustion, and is convenient for The boiler operator controls the boiler combustion air distribution; in addition, the plurality of sampling parts 300 can also increase the number of sampling positions, ensure the diversity of the sampling area, and make the measurement result more reliable. The sensor module 400 is used to measure other physical quantities related to the carbon monoxide content in the vehicle flue pipe 600, so as to obtain more accurate results in the measurement module 500, which is convenient for the operator to control the combustion air intake. It can be understood that the oxygen field dynamic measurement system can basically cover the cross-sectional space field of the flue pipe because of the presence of the scanning component, so that the sampling position in the flue pipe The measured oxygen signal is more representative, global and authentic. In addition, the measurement module 500 can output oxygen mean value, field distribution value, oxygen trend and over-limit warning signals after analyzing the oxygen content, providing strong signal guarantee for boiler operation. Reliable and advanced measurement units are used to ensure long-term, stable and reliable operation of the system. The measurement system adopts anti-wear, anti-ashing, anti-corrosion and self-cleaning design to reduce the maintenance workload of thermal maintenance personnel. By setting different sensor modules 400, the system can not only measure oxygen signals, but also other signals required for boiler operation.

[0030] It should be noted that the scanning rod in the boiler flue gas volume field moves left and right on the cross-section of the flue duct, and can move to cover the cross-sectional space of the flue duct; the sampling head is coated with silicon carbide to achieve abrasion resistance, and an anti-blowing component is used to prevent ash accumulation on the sampling head. It is made of materials such as stainless steel, such as 316L, 2205, etc., to achieve the effect of anti-corrosion, so as to extend the service life of the entire sampling head; various sensors and flue gas sampling heads can be installed on the scanning rod 200a according to requirements. When measuring temperature, multiple temperature sensors are used; when measuring carbon monoxide, multiple sampling heads are installed. The flue gas samples collected by multiple sampling heads need to be processed including filtration, water removal, etc., and then measured with a carbon monoxide sensor. The number and spacing of the measuring sensors are set according to the size of the flue duct to be measured and the scanning accuracy requirements, such as 3-10. The sealing sleeve 610 can be a packing gland structure or a labyrinth positive pressure sealing sleeve 610; sampling heads with different scanning areas can be flexibly selected according to the size of the on-site flue duct to meet the requirements of on-site personalized customization; the flue gas volume field dynamic measurement control cabinet intelligently processes the collected oxygen signal and can output different types of signals to meet the operation requirements of the operators. The output signal is transmitted to the control module 800, and the control module 800 controls the scanning component. The output signal can also be hard-wired or uploaded to the DCS system by wireless communication. It should be noted that the control module 800 is a conventional industrial control module, and the DCS system is a common industrial control system. The DCS system and the control module 800 are integrated.

[0031] In some embodiments, the sensing module 400 and the sampling unit 300 are alternately arranged. The alternately arranged sensing module 400 and sampling unit 300 make the sampling positions evenly distributed and discretely distributed, so that the results of sampling detection are more universal and representative. It can be understood that the spacing between the sensing module 400 and the sampling unit 300 changes in a gradient from top to bottom. The spacing or position of the sensing module 400 and the sampling unit 300 is reasonably set according to the theoretical distribution mode of the flue gas. For example, the distance between adjacent sensors gradually increases from top to bottom, and the distance between adjacent sampling units 300 also gradually increases from top to bottom. It can be understood that the sensing module 400 includes a temperature sensor, a humidity sensor, a flow sensor, a flow velocity sensor, and / or an oxygen sensor, etc. It can be one of them or a combination of multiple ones.

[0032] In some embodiments, the scanning assembly includes: an extension arm 200b inserted through the flue duct; a scanning rod 200a rotatably connected to one end of the extension arm 200b. A driving member is in transmission connection with the scanning rod. The scanning rod 200a extends vertically to the inner bottom of the flue duct 600. The sampling part 300 includes a sampling head. The sensing module 400 includes a temperature sensor, an oxygen sensor, a humidity sensor, a pressure sensor, and / or a flow rate sensor. Both the sampling head and the sensing module 400 are arranged on the scanning rod 200a. It should be noted that the power member is a motor that provides power to rotate the scanning rod 200a for scanning. One end of the extension arm 200b refers to the end extending into the flue duct.

[0033] In some embodiments, the driving member includes: a lead screw mechanism 100b arranged on the flue duct 600; the scanning assembly includes: an extension arm 200b slidably inserted through the side wall of the flue duct 600. One end of the extension arm 200b is in transmission connection with the lead screw mechanism 100b. The lead screw mechanism 100b is used to drive the extension arm 200b to slide into or out of the flue duct 600; a scanning rod 200a connected to the other end of the extension arm 200b. The scanning rod 200a extends vertically to the inner bottom of the flue duct 600. The sampling part 300 includes a sampling head. The sensing module 400 includes a temperature sensor. Both the sampling head and the temperature sensor are arranged on the scanning rod 200a. The lead screw mechanism 100b has high transmission accuracy and is convenient for smoothly adjusting the scanning position of the scanning rod 200a.

[0034] In some embodiments, the lead screw mechanism 100b includes: a mounting seat 110 arranged on the flue duct 600; a guide rail 120 arranged on the mounting seat 110; a slider 130 slidably connected to the guide rail 120 along the extension direction of the guide rail 120. The extension arm 200b is connected to the slider 130. The slider 130 is used to drive the extension arm 200b to slide; a motor 140 arranged on the mounting seat 110; a lead screw 150 rotatably connected to the mounting seat 110. The slider 130 is threadedly connected to the lead screw 150. The lead screw 150 is in transmission connection with the motor 140. The motor 140 is used to drive the lead screw 150 to rotate.

[0035] In some embodiments, the sampling head, the scanning rod 200a, and the temperature sensor are all covered with wear-resistant layers. An anti-wear cover 310 is sleeved on the sampling head. Wear-resistant materials and the anti-wear cover 310 are used to prevent solid particles in the flue duct 600 from wearing the sampling head, the scanning rod 200a, and the temperature sensor, aiming to extend the service life.

[0036] In some embodiments, it further includes an anti-dust-accumulation component. The anti-dust-accumulation component includes a flue gas filter element 710 and a back-blowing element 720. The flue gas filter element 710 is disposed on the sampling head, and the back-blowing element 720 is disposed on the pipeline between the sampling head and the measurement module 500. The back-blowing element 720 is used to back-blow gas to the sampling head to clean the accumulated dust. It can be understood that the back-blowing element 720 is actually a high-pressure air pump, and the gas pressure output by it is higher than the conveying pressure of the flue gas. The high-pressure air pump is connected to the pipeline between the sampling head and the measurement module 500.

[0037] In some embodiments, the sampling head is disposed at a predetermined angle with respect to the flow direction of the flue gas in the flue duct 600, and the air inlet of the sampling head faces the flue gas flow direction, so as to avoid the direct filling of the flue gas in the flue duct 600 into the air inlet of the sampling head.

[0038] In some embodiments, a sealing sleeve 610 is disposed on the side wall of the flue duct 600. The sealing sleeve 610 is slidably connected to the extension arm 200b, and the sealing sleeve 610 is used to seal the flue duct 600.

[0039] In some embodiments, both the extension arm 200b and the scanning rod 200a are provided as hollow. The sampling head communicates with the inner cavity of the scanning rod 200a, and the inner cavity of the extension arm 200b communicates with the measurement module 500. The hollow extension arm 200b and scanning rod 200a can not only reduce the weight but also play a role in guiding the flue gas.

[0040] The above has described the embodiments of the present invention in detail with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. A boiler oxygen field dynamic measurement system, characterized in that: Applicable to flue pipe (600), including: A driving member, arranged on the flue pipe (600); a scanning assembly, drivingly connected to the driving member, the scanning assembly being movably arranged in the flue pipe, the driving member being used to drive the scanning assembly to scan a cross-sectional area of ​​the flue pipe (600); A sampling part (300) is provided in plurality, wherein the plurality of sampling parts (300) are arranged on the scanning component; A plurality of sensor modules (400) are provided, wherein the plurality of sensor modules (400) are provided on the scanning component; A measuring module (500) connected to the sampling portion (300), the measuring module (500) being used to measure the content of oxygen and carbon monoxide in the gas sample; A control module (800) is electrically connected to the driving component, the sensing module (400) and the measuring module (500), and the control module is used to analyze signals transmitted from the sensing module (400) and the measuring module (500), and to control the action of the driving component.

2. A boiler oxygen field dynamic measurement system according to claim 1, characterized in that: The sensing modules (400) and the sampling parts (300) are arranged alternately.

3. A boiler oxygen field dynamic measurement system according to claim 2, characterized in that: The scanning component comprises: An extension arm (200b) is connected to the flue pipe; A scanning rod (200a) is rotatably connected to one end of the extension arm (200b); the driving member is drivingly connected to the scanning rod; the scanning rod (200a) extends vertically to the inner bottom of the flue pipe (600); the sampling portion (300) comprises a sampling head; the sensor module (400) comprises a temperature sensor, an oxygen sensor, a humidity sensor, a pressure sensor and / or a flow rate sensor; the sampling head and the sensor module (400) are both arranged on the scanning rod (200a).

4. A boiler oxygen field dynamic measurement system according to claim 2, characterized in that: The driving member comprises: A screw mechanism (100b) is arranged on the flue pipe (600); The scanning component comprises: An extension arm (200b) is slidably connected to a side wall of the flue pipe (600); one end of the extension arm (200b) is drivingly connected to the screw mechanism (100b); the screw mechanism (100b) is used to drive the extension arm (200b) to slide into or out of the flue pipe (600); A scanning rod (200a) is connected to the other end of the extension arm (200b), the scanning rod (200a) extending vertically to the inner bottom of the flue pipe (600), the sampling portion (300) comprising a sampling head, the sensing module (400) comprising a temperature sensor, an oxygen sensor, a humidity sensor, a pressure sensor and / or a flow rate sensor, and the sampling head and the sensing module (400) are both arranged on the scanning rod (200a).

5. A boiler oxygen field dynamic measurement system according to claim 4, characterized in that: The screw mechanism (100b) comprises: A mounting seat (110) disposed on the flue pipe (600); A guide rail (120) disposed on the mounting seat (110); A slider (130) is slidably connected to the guide rail (120) along an extension direction of the guide rail (120), the extension arm (200b) is connected to the slider (130), and the slider (130) is used to drive the extension arm (200b) to slide; A motor (140) is arranged on the mounting seat (110); The screw rod (150) is rotatably connected to the mounting seat (110); the slider (130) is threadedly connected to the screw rod (150); the screw rod (150) is transmission-connected to the motor (140); and the motor (140) is used to drive the screw rod (150) to rotate.

6. A boiler oxygen field dynamic measurement system according to claim 3 or 5, characterized in that: The sampling head, the scanning rod (200a) and the sensor module (400) are all covered with a wear-resistant layer, and the sampling head is provided with an anti-wear cover (310).

7. A boiler oxygen field dynamic measurement system according to claim 6, characterized in that: It also includes an anti-ash accumulation component, which includes a flue gas filter (710) and a back-blowing component (720). The flue gas filter (710) is arranged on the sampling head, and the back-blowing component (720) is arranged on a pipeline between the sampling head and the measurement module (500). The back-blowing component (720) is used to back-blow gas to the sampling head to clean the accumulated ash.

8. A boiler oxygen field dynamic measurement system according to claim 7, characterized in that: A predetermined angle is provided between the sampling head and the flow direction of the flue gas in the flue pipe (600).

9. A boiler oxygen field dynamic measurement system according to claim 4 or 5, characterized in that: A sealing sleeve (610) is provided on the side wall of the flue pipe (600); the sealing sleeve (610) is slidably connected to the extension arm (200b); the sealing sleeve (610) is used to seal the flue pipe (600).

10. A boiler oxygen field dynamic measurement system according to claim 9, characterized in that: The extension arm (200b) and the scanning rod (200a) are both arranged to be hollow, the sampling head is connected to the inner cavity of the scanning rod (200a), and the inner cavity of the extension arm (200b) is connected to the measurement module (500).

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