Method and device for measuring flue gas flow in subareas

Abstract

The invention relates to the technical field of flue gas flow monitoring, and discloses a method and device for measuring flue gas flow in a partitioned mode, and the method comprises the steps that the whole flue section is equally divided into a plurality of partitions, and at least one preset monitoring point is arranged in each partition; according to the flue gas temperature, the flue gas pressure, the flue gas differential pressure and the real-time flue gas density, the flue gas average flow velocity of each partition is calculated; setting different weight coefficients for each subarea according to the distribution condition of the flue gas flow field or the unit load, and calculating the average flue gas flow velocity of the flue section according to the average flue gas flow velocity of each subarea and the weight coefficients; and according to the flue gas average flow velocity of the flue section and the flue section, calculating to obtain the flue gas standard dry flow. The whole section is equally divided into a plurality of partitions, and grid method measurement of the whole flue gas interface is achieved. Meanwhile, the most representative feature point location is determined according to the polling measurement result of the conventional point location or the unit load, and the problem that point location selection of a traditional method lacks representativeness is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas flow monitoring, and in particular to a method and device for measuring flue gas flow by partition. Background Art

[0002] Currently, the flue gas flow monitoring technology for thermal power units is generally divided into two categories: point measurement and line measurement. The measurement results must be converted to the average flow velocity of surface measurement to more accurately measure the flow of wet flue gas. However, whether it is point measurement or line measurement, or the existing matrix type, multi-channel ultrasonic flowmeter and other quasi-surface measurement methods, there are problems such as lack of basis for point selection, insufficient representativeness of points, and the use of fixed flue gas density, which leads to poor accuracy of monitoring results. Summary of the Invention

[0003] In view of this, the present invention provides a method and device for measuring flue gas flow in different zones to solve the problems of lack of basis for point selection, insufficient representativeness of points and poor accuracy of monitoring results.

[0004] In a first aspect, the present invention provides a method for measuring flue gas flow by partition, the method comprising:

[0005] The entire flue cross section is equally divided into a plurality of partitions, and at least one preset monitoring point is set in each partition. The preset monitoring point is determined based on the round-robin measurement results of conventional points or the unit load;

[0006] Use the integrated flue gas temperature, pressure and flow sensing equipment to collect the flue gas temperature, flue gas pressure and flue gas differential pressure at the preset monitoring points in each zone;

[0007] Calculate the average flue gas flow rate of each partition according to the flue gas temperature, the flue gas pressure, the flue gas differential pressure and the real-time flue gas density;

[0008] Different weight coefficients are set for each partition according to the distribution of the flue gas flow field or the unit load, and the average flue gas flow velocity of the flue section is calculated based on the average flue gas flow velocity of each partition and the weight coefficient;

[0009] The standard dry flow rate of flue gas is calculated based on the average flue gas velocity and flue cross section.

[0010] The present invention provides a method for measuring flue gas flow by partitioning, which divides the entire cross section into multiple partitions. In each partition, a flue gas temperature, pressure and flow integrated sensor device that can move vertically and horizontally is used to implement grid measurement of the entire flue gas interface. At the same time, the most representative feature points are determined based on the round-robin measurement results of conventional points or the unit load, which solves the problem of lack of representativeness in point selection of traditional methods. Each partition can implement grid measurement within the partition, and the partition weight coefficient can be scientifically set. When monitoring and calculating the flue gas flow rate at each measuring point, the flue gas density is calculated in real time by integrating parameters such as flue gas composition, flue gas temperature, humidity, and pressure, so as to calculate the real-time flue gas flow, which solves the problem that the traditional flow monitoring method uses a fixed flue gas density and the monitoring results are less accurate.

[0011] In an optional embodiment, calculating the average flue gas flow rate of each partition according to the flue gas temperature, the flue gas pressure, the flue gas differential pressure, and the real-time flue gas density includes:

[0012] Calculating the flue gas flow rate at each preset monitoring point according to the flue gas temperature, the flue gas pressure, the flue gas differential pressure and the real-time flue gas density;

[0013] The flue gas flow rates at the preset monitoring points in each zone are summed and averaged to obtain the initial average flue gas flow rate of each zone;

[0014] Get the velocity field coefficients of each partition;

[0015] The product of the initial average flow velocity of the smoke in each partition and the velocity field coefficient is calculated to obtain the average flow velocity of the smoke in each partition.

[0016] In an optional embodiment, the velocity field coefficient is determined under a preset load section based on the ratio of the average flue gas flow rate obtained by pre-round-robin measurement of all conventional points to the flue gas flow rate at a preset monitoring point.

[0017] In an optional embodiment, the flue gas temperature, pressure and flow integrated sensing device uses a horizontal moving rod and a lifting rod to achieve vertical and horizontal movement to collect the flue gas temperature, flue gas pressure and flue gas differential pressure at preset monitoring points in each partition.

[0018] In an optional embodiment, the method for determining the preset monitoring point includes:

[0019] Under different load sections, the flue gas flow rate of each conventional point is measured one by one in a round-robin manner, and the preset monitoring points of each partition under different load sections and the velocity field coefficient of each partition are determined according to the flue gas flow rate of each conventional point.

[0020] In an optional embodiment, the real-time smoke density calculation formula is as follows:

[0021]

[0022] Where,

[0023] is the volume content of oxygen in the flue gas, is the volume content of carbon dioxide in the flue gas, is the flue gas humidity, is the volume content of nitrogen in the flue gas, P 大气压 is the ambient atmospheric pressure, P 静 is the static pressure of flue gas.

[0024] In an optional embodiment, the calculation formula for the standard dry flue gas flow rate is as follows:

[0025]

[0026] Where Q sn is the standard dry flow rate of flue gas, Q s is the wet flue gas flow rate, A is the cross-sectional area of ​​the flue, is the average flue gas velocity, and T is the flue gas temperature.

[0027] In a second aspect, the present invention provides a device for measuring flue gas flow rate in a partitioned manner, which is applied to a partitioned flue cross section. The device comprises: a parameter acquisition and flow processing unit, a plurality of integrated flue gas temperature, pressure and flow sensing devices, and a plurality of temperature, pressure and flow signal processing units, wherein:

[0028] A flue gas temperature, pressure and flow integrated sensing device and a temperature, pressure and flow signal processing unit are provided in each zone, and the flue gas temperature, pressure and flow integrated sensing device is connected to the input end of the temperature, pressure and flow signal processing unit;

[0029] The output end of the temperature and pressure flow signal processing unit is connected to the input end of the parameter acquisition and flow processing unit;

[0030] The flue gas temperature, pressure and flow integrated sensing equipment collects the flue gas temperature, flue gas pressure and flue gas differential pressure at the preset monitoring points in each zone, and sends the flue gas temperature, flue gas pressure and flue gas differential pressure to the parameter collection and flow processing unit via the temperature, pressure and flow signal processing unit;

[0031] The parameter acquisition and flow processing unit calculates the average flue gas flow rate of each partition based on the flue gas temperature, the flue gas pressure, the flue gas differential pressure and the real-time flue gas density; sets different weight coefficients for each partition based on the distribution of the flue gas flow field or the unit load, and calculates the average flue gas flow rate of the flue cross section based on the average flue gas flow rate of each partition and the weight coefficient; calculates the standard dry flow of the flue gas based on the average flue gas flow rate and the flue cross section.

[0032] The present invention provides a device for measuring flue gas flow rate by partitioning, in which a flue gas temperature, pressure and flow integrated sensor device that can move vertically and horizontally is used in each partition to realize grid measurement of the entire flue gas interface. At the same time, the most representative characteristic points are determined based on the round-robin measurement results of conventional points or the unit load, which solves the problem of lack of representativeness in point selection of traditional methods. Each partition can realize grid measurement within the partition, and the partition weight coefficient can be scientifically set. When monitoring and calculating the flue gas flow rate of each measuring point, the flue gas density is calculated in real time by integrating parameters such as flue gas composition, flue gas temperature, humidity, and pressure, so as to calculate the real-time flue gas flow, which solves the problem that the traditional flow monitoring method adopts a fixed flue gas density and the monitoring result has poor accuracy.

[0033] In an optional embodiment, the device further includes: a vertical lifting device, a horizontal moving device and a round-robin measurement control unit, wherein:

[0034] The round-robin measurement control unit is connected to the vertical lifting device and the horizontal moving device respectively; the vertical lifting device is used to control the vertical lifting of the flue gas temperature, pressure and flow integrated sensing device according to the signal sent by the round-robin measurement control unit;

[0035] The horizontal movement device is used to control the horizontal movement of the flue gas temperature, pressure and flow integrated sensing device according to the signal sent by the round-robin measurement control unit.

[0036] In an optional embodiment, the device further comprises: a signal transmission cable, a control cable, a vertical lifting device control cable and a horizontal moving device control cable, wherein:

[0037] The flue gas temperature, pressure and flow integrated sensing device is connected to the temperature, pressure and flow signal processing unit via the signal transmission cable and the control cable;

[0038] The temperature and pressure flow signal processing unit and the parameter acquisition and flow processing unit are connected via the signal transmission cable;

[0039] The vertical lifting device is connected to the flue gas temperature, pressure and flow integrated sensing device via the vertical lifting device control cable;

[0040] The horizontal moving device is connected to the flue gas temperature, pressure and flow integrated sensing device via the horizontal moving device control cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0042] Figure 1 2. It is a flow chart of a method for measuring flue gas flow by partition according to an embodiment of the present invention;

[0043] Figure 2 4 is a structural block diagram of a device for measuring flue gas flow rate by partition according to an embodiment of the present invention. DETAILED DESCRIPTION

[0044] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0045] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components; wireless connections or wired connections. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0047] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0048] Currently, the main methods for monitoring flue gas flow in thermal power units include single-point Pitot tube flowmeters, matrix flowmeters, and thermal flowmeters. Some units also use optical scintillation flowmeters and ultrasonic flowmeters.

[0049] Because the flue gas duct is very short, the flue gas cannot fully develop, resulting in severe backflow and secondary flow. In the backflow area, the pitot tube cannot be aligned with the incoming flow, resulting in large measurement errors for conventional pitot tubes. Furthermore, the matrix method uses multiple airflow points to combine into a single flow to measure the average dynamic and static pressures. Before the flue gas converges in the device, there may be pressure losses due to the effects of right-angled and directional airflows. Furthermore, there may be blockages at some points, affecting measurement accuracy, and other issues, resulting in large actual deviations.

[0050] Thermal mass flowmeters mainly measure the velocity and temperature of the fluid through probes, and calculate the flue gas flow rate comprehensively through velocity, temperature, probe voltage, etc. However, when measuring the flue gas flow rate with this traditional measurement method, the air flow temperature will affect the heat dissipation of the measuring probe during the heat transfer process, resulting in a large deviation in the measurement results. Therefore, temperature compensation is required for each set of probes, which leads to heavy and complicated workload. Therefore, this traditional flue gas flow measurement method has certain limitations, and the measurement accuracy is low. When the air flow contains a lot of dust, the measurement results are easily distorted, and the authenticity and accuracy of the detection data cannot be guaranteed. Moreover, the area where the sensor is located cannot represent the average flow velocity of the entire cross section, resulting in monitoring errors.

[0051] The principle of the optical scintillation flowmeter is to measure the intensity of turbulence based on the strength of the scintillation, and to calculate the average flow velocity of the gas flowing through the light path by analyzing the movement of the image. However, this method is prone to dust corrosion on the sensor probe mirror and the probe is easily adsorbed by smoke, which makes the measurement results easily distorted.

[0052] Ultrasonic flow meters are currently rarely used in thermal power units. On the one hand, due to the complex flue gas flow field, multiple channels are generally required to meet monitoring requirements, which will result in higher costs. On the other hand, there is currently a lack of effective technical means for how to select the location of the multiple channels and how to set the weight coefficients of each channel. At the same time, once the multiple channels are installed, they cannot be adjusted according to monitoring needs, which affects the monitoring accuracy.

[0053] Whether the sampling point selection of the flue gas flow device is representative, whether the flue gas flow field distribution in the flue where the sampling point is located is uniform, whether the flue gas density value is accurate, whether the velocity field coefficient is set reasonably, etc., will all affect the accurate measurement of the flue gas flow.

[0054] Existing flue gas flow rate monitoring is generally divided into two categories: point measurement and line measurement. The measurement results must be converted to the average flow rate of surface measurement in order to more accurately measure the flow rate of wet flue gas. However, whether it is point measurement or line measurement, or the existing matrix, multi-channel ultrasonic flowmeter and other quasi-surface measurement methods, there are many disadvantages such as lack of basis for point selection, insufficient representativeness of points, inability to dynamically adjust points according to monitoring feedback results, mutual interference of multi-point monitoring methods (such as disturbance interference in the multi-point matrix multi-channel flue gas convergence process, signal interference between multi-channel ultrasonic flowmeters, etc.), and multi-point measurement method does not set weight coefficients according to actual conditions or the weight coefficients are set arbitrarily.

[0055] According to an embodiment of the present invention, an embodiment of a method for measuring flue gas flow in partitions is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0056] This embodiment provides a method for measuring flue gas flow by partition. Figure 1 FIG. 1 is a flow chart of a method for measuring flue gas flow by partition according to an embodiment of the present invention. Figure 1 As shown, the process includes the following steps:

[0057] Step S1, divide the entire flue cross section into multiple partitions, set at least one preset monitoring point in each partition, and the preset monitoring point is determined based on the round-robin measurement results of conventional points or the unit load.

[0058] Specifically, the entire flue cross section is divided into multiple partitions according to different sizes. For example, the entire flue cross section can be divided into 2 / 4 / 6 / 8 partitions. Among them, the conventional points can be determined with reference to the sampling point setting method of GB / T16157. The preset monitoring points can be selected from conventional points with reference to the sampling point setting method of GB / T16157, or representative characteristic points (which can be one or more) can be selected based on the round-robin measurement results, or different characteristic points (which can be one or more) can be used according to different load sections.

[0059] Step S2: using the integrated flue gas temperature, pressure and flow sensing device to collect the flue gas temperature, flue gas pressure and flue gas differential pressure at the preset monitoring points in each zone.

[0060] Specifically, within each zone, a grid-based measurement of the entire flue gas interface is achieved using a vertically and horizontally movable integrated flue gas temperature, pressure, and flow sensor. The integrated flue gas temperature, pressure, and flow sensor utilizes a horizontally movable rod and a lifting rod to achieve vertical and horizontal movement, collecting flue gas temperature, pressure, and differential pressure at pre-set monitoring points within each zone.

[0061] Step S3, calculating the average flue gas flow rate of each zone according to the flue gas temperature, flue gas pressure, flue gas differential pressure and real-time flue gas density.

[0062] Specifically, the above step S3 includes:

[0063] Step S31 , calculating the flue gas flow rate at each preset monitoring point according to the flue gas temperature, flue gas pressure, flue gas differential pressure and real-time flue gas density.

[0064] In step S32, the flue gas flow rates at the preset monitoring points in each partition are summed and averaged to obtain the initial average flue gas flow rate of each partition.

[0065] Step S33: Obtain the velocity field coefficient of each partition.

[0066] Step S34 , calculating the product of the initial average smoke flow velocity in each partition and the velocity field coefficient to obtain the average smoke flow velocity in each partition.

[0067] In an embodiment of the present invention, when the preset monitoring points can select conventional points with reference to the sampling point setting method of GB / T16157, the initial average flue gas flow rate of each partition is the average value of each point. When the preset monitoring points select representative characteristic points based on the round-robin measurement results, the initial average flue gas flow rate of each partition is the average value of each point multiplied by the velocity field coefficient. When the preset monitoring points use different characteristic points according to different load segments, the initial average flue gas flow rate of each partition is the average value of each point multiplied by the velocity field coefficient, but the velocity field coefficient at this time will be adjusted according to the load segment. Among them, the velocity field coefficient is determined by the ratio of the average flue gas flow rate obtained by pre-round-robin measurement of all conventional points under the preset load segment to the flue gas flow rate of the preset monitoring point. Different velocity field coefficients can be set for different partitions, and the velocity field coefficient can also be dynamically adjusted according to changes in load, making the setting of the velocity constant coefficient more scientific. At the same time, different weight coefficients can be set for different partitions according to the distribution of the flow field, making the monitoring results more accurate.

[0068] Furthermore, the real-time smoke density calculation formula is as follows:

[0069]

[0070] Where,

[0071] is the volume content of oxygen in the flue gas, is the volume content of carbon dioxide in the flue gas, is the flue gas humidity, is the volume content of nitrogen in the flue gas, P 大气压is the ambient atmospheric pressure, P 静 is the static pressure of flue gas.

[0072] Step S4: setting different weight coefficients for each partition according to the distribution of the flue gas flow field or the unit load, and calculating the average flue gas flow velocity of the flue cross section according to the average flue gas flow velocity of each partition and the weight coefficient.

[0073] Specifically, the average flue gas flow rate of each zone obtained above is processed according to the set strategy to obtain the average flow rate of the flue cross section. The strategy can be to take the average value, or to set different weight coefficients based on the flow field simulation results or the unit load range, and then perform weighted averaging.

[0074] Step S5: Calculate the standard dry flow rate of the flue gas according to the average flue gas flow velocity and the flue cross section.

[0075] Specifically, after obtaining the real-time average flow velocity on the cross section, the flue gas standard dry flow rate is calculated in real time based on the flue gas cross-sectional area, flue gas temperature, pressure and other parameters. The formula is as follows:

[0076]

[0077] Where Q sn is the standard dry flow rate of flue gas, Q s is the wet flue gas flow rate, A is the cross-sectional area of ​​the flue, is the average flue gas velocity, and T is the flue gas temperature.

[0078] The present invention provides a method for measuring flue gas flow by partitioning, which divides the entire cross section into multiple partitions. In each partition, a flue gas temperature, pressure and flow integrated sensor device that can move vertically and horizontally is used to realize grid measurement of the entire flue gas interface. At the same time, the most representative feature point is determined based on the round-robin measurement results of conventional points or the unit load, which solves the problem of lack of representativeness in point selection of traditional methods. Each partition can realize grid measurement within the partition, and the partition weight coefficient can be scientifically set. When monitoring and calculating the flue gas flow rate of each measuring point, the flue gas density is calculated in real time by integrating parameters such as flue gas composition, flue gas temperature, humidity, and pressure, so as to calculate the real-time flue gas flow, which solves the problem that the traditional flow monitoring method uses a fixed flue gas density and the monitoring result has poor accuracy. Flue gas flow is a key factor affecting the accuracy of monitoring the results of thermal power CO2 emissions. Accurate monitoring of flue gas flow can greatly improve the accuracy of the monitoring results of flue gas CO2 emissions, which is of great significance to the carbon emission control and carbon trading compliance of enterprises.

[0079] In an optional embodiment, the method for determining the preset monitoring points includes:

[0080] Under different load sections, the flue gas flow rate of each conventional point is measured one by one in a round-robin manner, and the preset monitoring points of each partition under different load sections and the velocity field coefficient of each partition are determined according to the flue gas flow rate of each conventional point.

[0081] Specifically, after installation, the device determines all points to be tested according to the sampling point grid method requirements of GB / T16157. Under different load sections (such as 80% to 100%, 60% to 80%, 40% to 60%, and <40%), the results of each point to be tested are measured one by one in rotation. Based on the results, the preset monitoring points and velocity field coefficients of each partition under different load sections are determined, and this result is set as the control strategy. After being put into use, the load section is first determined according to the above results, and then the temperature, pressure and flow integrated sensing equipment in each partition is automatically moved to the characteristic point through the horizontal and vertical movement devices for automatic measurement (if multiple points are involved, the measurement order and time of multiple points can be set in rotation). The appropriate velocity field coefficient is selected according to the load section to calculate the flue gas flow under the current load.

[0082] like Figure 2 As shown, the present invention provides a device for measuring flue gas flow rate by zone, applicable to zoned flue cross-sections. The device comprises: a parameter acquisition and flow processing unit 1, multiple integrated flue gas temperature, pressure, and flow sensing devices 2, and multiple temperature, pressure, and flow signal processing units 3. Each zone is provided with a flue gas temperature, pressure, and flow sensing device 2 and a temperature, pressure, and flow signal processing unit 3. The integrated flue gas temperature, pressure, and flow sensing device 2 is connected to the input of the temperature, pressure, and flow signal processing unit 3. The output of the temperature, pressure, and flow signal processing unit 3 is connected to the input of the parameter acquisition and flow processing unit 1.

[0083] Specifically, the entire flue cross section is divided into a plurality of equal partitions, and in each partition, a flue gas temperature, pressure and flow integrated sensing device 2 (temperature, pressure and flow rate) that can move vertically and horizontally (realized by a horizontal moving rod and a lifting rod) is used to realize the grid method measurement of the entire flue gas interface. The flue gas temperature, pressure and flow integrated sensing device 2 collects the flue gas temperature, pressure and differential pressure at the preset monitoring points in each partition, and sends the flue gas temperature, pressure and differential pressure to the parameter acquisition and flow processing unit 1 through the temperature, pressure and flow signal processing unit 3. The parameter acquisition and flow processing unit 1 calculates the average flue gas flow rate of each partition based on the flue gas temperature, pressure, differential pressure and real-time flue gas density; sets different weight coefficients for each partition based on the distribution of the flue gas flow field or the unit load, and calculates the average flue gas flow rate of the flue cross section based on the average flue gas flow rate of each partition and the weight coefficient; calculates the standard flue gas flow rate based on the average flue gas flow rate of the flue cross section and the flue cross section.

[0084] In this embodiment of the present invention, the integrated flue gas temperature, pressure and flow sensing device 2 is connected to the temperature, pressure and flow signal processing unit 3 via a signal transmission cable 4 and a control cable 5. The temperature, pressure and flow signal processing unit 3 is connected to the parameter acquisition and flow processing unit 1 via a signal transmission cable 6.

[0085] The present invention provides a device for measuring flue gas flow rate by partitioning, in which a flue gas temperature, pressure and flow integrated sensor device that can move vertically and horizontally is used in each partition to realize grid measurement of the entire flue gas interface. At the same time, the most representative characteristic points are determined based on the round-robin measurement results of conventional points or the unit load, which solves the problem of lack of representativeness in point selection of traditional methods. Each partition can realize grid measurement within the partition, and the partition weight coefficient can be scientifically set. When monitoring and calculating the flue gas flow rate of each measuring point, the flue gas density is calculated in real time by integrating parameters such as flue gas composition, flue gas temperature, humidity, and pressure, so as to calculate the real-time flue gas flow, which solves the problem that the traditional flow monitoring method adopts a fixed flue gas density and the monitoring result has poor accuracy.

[0086] In an optional embodiment, as Figure 2 As shown, the device also includes a vertical lifting device 7, a horizontal movement device 8, and a round-robin measurement control unit 9. The round-robin measurement control unit 9 is connected to the vertical lifting device 7 and the horizontal movement device 8, respectively. The vertical lifting device 7 is used to control the vertical lifting and lowering of the integrated flue gas temperature, pressure, and flow sensing device 2 based on signals sent by the round-robin measurement control unit 9. The horizontal movement device 8 is used to control the horizontal movement of the integrated flue gas temperature, pressure, and flow sensing device 2 based on signals sent by the round-robin measurement control unit 9.

[0087] Specifically, the vertical lift device 7 is connected to the integrated flue gas temperature, pressure, and flow sensing device 2 via a vertical lift device control cable 10. The horizontal movement device 8 is connected to the integrated flue gas temperature, pressure, and flow sensing device 2 via a horizontal movement device control cable 11. The integrated flue gas temperature, pressure, and flow sensing device 2 utilizes a horizontal movement rod and a lifting rod to achieve vertical and horizontal movement, collecting flue gas temperature, pressure, and differential pressure at pre-set monitoring points within each zone.

[0088] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A method for measuring flue gas flow by partition, characterized in that: The method comprises: The entire flue cross section is equally divided into a plurality of partitions, and at least one preset monitoring point is set in each partition. The preset monitoring point is determined based on the round-robin measurement results of conventional points or the unit load; Use the integrated flue gas temperature, pressure and flow sensing equipment to collect the flue gas temperature, flue gas pressure and flue gas differential pressure at the preset monitoring points in each zone; Calculate the average flue gas flow rate of each partition according to the flue gas temperature, the flue gas pressure, the flue gas differential pressure and the real-time flue gas density; Different weight coefficients are set for each partition according to the distribution of the flue gas flow field or the unit load, and the average flue gas flow velocity of the flue section is calculated based on the average flue gas flow velocity of each partition and the weight coefficient; The standard dry flow rate of flue gas is calculated based on the average flue gas velocity and flue cross section.

2. The method for measuring flue gas flow by partition according to claim 1, characterized in that: Calculating the average flue gas flow rate of each partition according to the flue gas temperature, the flue gas pressure, the flue gas differential pressure, and the real-time flue gas density includes: Calculating the flue gas flow rate at each preset monitoring point according to the flue gas temperature, the flue gas pressure, the flue gas differential pressure and the real-time flue gas density; The flue gas flow rates at the preset monitoring points in each zone are summed and averaged to obtain the initial average flue gas flow rate of each zone; Get the velocity field coefficients of each partition; The product of the initial average flow velocity of the smoke in each partition and the velocity field coefficient is calculated to obtain the average flow velocity of the smoke in each partition.

3. The method for measuring flue gas flow by partition according to claim 2, characterized in that: The velocity field coefficient is determined by the ratio of the average flue gas flow rate obtained by pre-round-robin measurement of all conventional points to the flue gas flow rate at a preset monitoring point under a preset load section.

4. The method for measuring flue gas flow by partition according to claim 1, characterized in that: The flue gas temperature, pressure and flow integrated sensing device utilizes a horizontal moving rod and a lifting rod to achieve vertical and horizontal movement, and collects the flue gas temperature, flue gas pressure and flue gas differential pressure at preset monitoring points in each partition.

5. The method for measuring flue gas flow by partition according to claim 1, characterized in that: Methods for determining preset monitoring points include: Under different load sections, the flue gas flow rate of each conventional point is measured one by one in a round-robin manner, and the preset monitoring points of each partition under different load sections and the velocity field coefficient of each partition are determined according to the flue gas flow rate of each conventional point.

6. The method for measuring flue gas flow by partition according to claim 1, characterized in that: The real-time flue gas density calculation formula is as follows: Where, is the volume content of oxygen in the flue gas, is the volume content of carbon dioxide in the flue gas, is the flue gas humidity, is the volume content of nitrogen in the flue gas, P 大气压 is the ambient atmospheric pressure, P 静 is the static pressure of flue gas.

7. The method for measuring flue gas flow by partition according to claim 1, characterized in that: The calculation formula for the standard dry flue gas flow rate is as follows: Where Q sn is the standard dry flow rate of flue gas, Q s is the wet flue gas flow rate, A is the cross-sectional area of ​​the flue, is the average flue gas velocity, and T is the flue gas temperature.

8. A device for measuring flue gas flow rate by partition, characterized in that: Applied to the partitioned flue section, the device includes: a parameter acquisition and flow processing unit, a plurality of flue gas temperature and pressure flow integrated sensing devices, and a plurality of temperature and pressure flow signal processing units, wherein, A flue gas temperature, pressure and flow integrated sensing device and a temperature, pressure and flow signal processing unit are provided in each zone, and the flue gas temperature, pressure and flow integrated sensing device is connected to the input end of the temperature, pressure and flow signal processing unit; The output end of the temperature and pressure flow signal processing unit is connected to the input end of the parameter acquisition and flow processing unit; The flue gas temperature, pressure and flow integrated sensing equipment collects the flue gas temperature, flue gas pressure and flue gas differential pressure at the preset monitoring points in each zone, and sends the flue gas temperature, flue gas pressure and flue gas differential pressure to the parameter collection and flow processing unit via the temperature, pressure and flow signal processing unit; The parameter acquisition and flow processing unit calculates the average flue gas flow rate of each partition based on the flue gas temperature, the flue gas pressure, the flue gas differential pressure and the real-time flue gas density; sets different weight coefficients for each partition based on the distribution of the flue gas flow field or the unit load, and calculates the average flue gas flow rate of the flue cross section based on the average flue gas flow rate of each partition and the weight coefficient; calculates the standard dry flow of the flue gas based on the average flue gas flow rate and the flue cross section.

9. The device for measuring flue gas flow by partition according to claim 8, characterized in that: The device also includes: a vertical lifting device, a horizontal moving device and a round-robin measurement control unit, wherein: The round-robin measurement control unit is connected to the vertical lifting device and the horizontal moving device respectively; the vertical lifting device is used to control the vertical lifting of the flue gas temperature, pressure and flow integrated sensing device according to the signal sent by the round-robin measurement control unit; The horizontal movement device is used to control the horizontal movement of the flue gas temperature, pressure and flow integrated sensing device according to the signal sent by the round-robin measurement control unit.

10. The device for measuring flue gas flow by partition according to claim 9, characterized in that: The device also includes: a signal transmission cable, a control cable, a vertical lifting device control cable and a horizontal moving device control cable, wherein: The flue gas temperature, pressure and flow integrated sensing device is connected to the temperature, pressure and flow signal processing unit via the signal transmission cable and the control cable; The temperature and pressure flow signal processing unit and the parameter acquisition and flow processing unit are connected via the signal transmission cable; The vertical lifting device is connected to the flue gas temperature, pressure and flow integrated sensing device via the vertical lifting device control cable; The horizontal moving device is connected to the flue gas temperature, pressure and flow integrated sensing device via the horizontal moving device control cable.

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