CN207280521U - A kind of full flue gas flow measuring device of matrix form - Google Patents

Abstract

The utility model discloses a matrix type full flue gas flow measuring device. The device includes a total pressure measurement system, a static pressure measurement system, a differential pressure measurement element and a fixing piece. The total pressure measurement system is composed of several measurement units. Each measurement unit includes a pressure introduction main circuit and a pressure introduction pipe. The pressure introduction main circuit is fixed in the flue through a fixture, and the mouth of the pressure introduction pipe is facing the direction of flue gas flow; the static pressure measurement system is parallel It is arranged on the back side of the total pressure measurement system, and its structure is the same as that of the total pressure measurement system. Formed by welding, they are respectively connected with the differential pressure measuring elements arranged outside the flue; the measuring device of the utility model can measure the flue gas flow stably and reliably.

Description

A matrix type full flue gas flow measurement device

technical field

The utility model relates to a flue gas flow monitoring device, in particular to a matrix type full flue gas flow measuring device.

Background technique

With the increasingly serious environmental pollution problems and the further improvement of national environmental protection policies and requirements, it is very important to realize online and accurate monitoring of flue gas pollutant emissions.

At present, the measurement devices used for on-line monitoring of flue gas flow mainly include thermal flowmeters, single-point Pitot tube flowmeters, ultrasonic flowmeters, multi-point flowmeters and cross-sectional flowmeters. The thermal flowmeter is a single-point measurement. Due to the high humidity of the flue gas and the presence of a large amount of dust, it is easy to attach dust to the surface of the sensor, resulting in large flow measurement errors and requiring frequent calibration. The diameter of the single-point Pitot tube flowmeter is generally small, and it is easy to block when the dust and humidity are high, resulting in the measurement data being 0. The maintenance is large, and the Pitot tube requires sufficient straight pipe stability during installation. In the flow section, most industrial sites do not have the installation conditions. The ultrasonic flowmeter calculates the flow rate value by measuring the time difference between ultrasonic emission and reception. The measurement data has higher accuracy than other measurement methods, but it is expensive and difficult to apply in large-scale industries. The multi-point flowmeter mainly calculates the flow velocity value by measuring the differential pressure, but this method can only collect the linear flow velocity of a section, which cannot represent the flow velocity of the section well, and requires a Most industrial sites do not have the installation conditions for the long straight pipe steady flow section. At present, most of the existing cross-sectional flowmeters adopt flange connection and are installed between two pipes, which have high requirements for the flue pipe; in addition, the pressure-taking pipes of the existing cross-sectional flowmeters are generally thick, and the project cost is high. And it is easy to cause interference to the smoke flow field and affect the accuracy of the measurement results.

Contents of the invention

In order to solve the above-mentioned defects existing in the existing flue gas flow monitoring device and method, the purpose of this utility model is to provide a matrix type full flue gas flow meter with stable and reliable flow measurement, low requirements for straight pipe sections, not easy to block, and easy to maintain. measuring device.

In order to achieve the above object, the utility model adopts the following technical solutions:

A matrix full flue gas flow measurement device, including a total pressure measurement system 1, a static pressure measurement system 2, a differential pressure measurement element and a fixture; the total pressure measurement system 1 is composed of several measurement units 3, each measuring The unit includes the pressure introduction main circuit 4 and the pressure introduction pipe 5 connected to the bottom of the pressure introduction main circuit 4. The pressure introduction main circuit 4 is fixed in the flue through a fixing piece, and the mouth of the pressure introduction pipe 5 of the total pressure measurement system 1 is facing the flue gas Incoming flow direction; the static pressure measurement system 2 is arranged in parallel on the back side of the total pressure measurement system 1, and its structure is the same as that of the total pressure measurement system 1. The system 1 and the static pressure measurement system 2 are respectively connected with the differential pressure measurement elements arranged outside the flue.

The total pressure measurement system 1 and the static pressure measurement system 2 are two independent structural parts, which are formed by welding in the form of a backrest tube.

Preferably, the pressure introduction main circuit 4 and the pressure introduction pipe 5 are 316L stainless steel pipes coated with polytetrafluoroethylene.

Preferably, the pressure introduction main circuit 4 and the pressure introduction pipe 5 are round pipes of Φ33.7×3.5 mm.

Preferably, the pressure introduction main circuit 4 and the pressure introduction pipe 5 are considered to be equipped with compressed air purging devices according to the actual use of the industrial site, so as to prevent pipeline blockage.

The peripheral frame size of the matrix full flue gas flow measuring device is customized according to the size of the flue, and the number of the measuring units 3 increases or decreases proportionally.

Preferably, the differential pressure measuring element is a micro differential pressure sensor.

The measurement method of the matrix type full flue gas flow measuring device divides the flue into several rectangular areas with the same area, and each rectangular area is provided with a measurement unit 3, so that each rectangular area has a guide The pressure point can measure the total pressure and static pressure; in this way, there will be several measuring units 3 with the same area in the flue, and the total pressure and static pressure collected by these measuring units 3 will be input into the differential pressure measuring element and averaged Calculate the average total pressure and average static pressure of the flue cross section, and then obtain the average measured differential pressure of the entire flue gas; according to the average differential pressure, the flow velocity of the entire section can be calculated more accurately, according to the velocity area method , according to the cross-sectional area of the flue, the flow data of the flue can be obtained, so as to better reflect the flue gas situation under this working condition.

The utility model has the following advantages:

1. The matrix type full flue gas flow measuring device of the utility model sets several measuring units in a matrix type in the flue, and calculates the average value of the differential pressure measured by each measuring unit, so as to obtain the average flow velocity of the entire cross section.

2. Compared with the prior art, the utility model has high measurement point density and uniform distribution, and the average differential pressure of the entire flue section can be measured by surface instead of point, which can greatly improve the accuracy and stability of measurement data.

3. The full-pressure sampling pipe and the static-pressure sampling pipe of the matrix-type full-flue gas flow measuring device described in the utility model are two independent structural parts, which are formed by welding in the form of a backrest pipe.

4. The pipeline of the matrix-type full flue gas flow measuring device described in the utility model adopts a 316L stainless steel tube with a diameter of Φ33.7×3.5mm and a polytetrafluoroethylene coating on the outside. According to the actual use of the industrial site, it can be considered to increase the compressed air purge device to avoid pipeline blockage.

5. The utility model adopts an integral frame structure, which has low requirements on the flue pipeline, and can be assembled and disassembled as a whole, which significantly reduces the difficulty of installation and maintenance.

Description of drawings

Fig. 1 is the overall structure diagram of the utility model.

Fig. 2 is the front view of the utility model.

Fig. 3 is a side view of the utility model.

Fig. 4 is a top view of the utility model.

Wherein the meaning of each reference mark is as follows:

1. Total pressure measurement system; 2. Static pressure measurement system; 3. Measuring unit; 4. Pressure main road; 5. Pressure pipe.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in more detail.

As shown in Figure 1, Figure 2, Figure 3 and Figure 4, a matrix type full flue gas flow measurement device of the present invention includes a total pressure measurement system 1, a static pressure measurement system 2, a differential pressure measurement element and a fixing piece , the total pressure measurement system 1 is composed of several measurement units 3, each measurement unit includes a pressure introduction main circuit 4 and a pressure introduction pipe 5 communicating with the bottom of the pressure introduction main circuit 4, and the pressure introduction main circuit 4 passes through a fixing piece Fixed in the flue, the mouth of the pressure induction pipe 5 is facing the direction of the flue gas flow; the static pressure measurement system is arranged in parallel on the back side of the total pressure measurement system, and its structure is the same as that of the total pressure measurement system. The mouth of the pressure pipe faces away from the direction of flue gas flow; the total pressure measurement system and the static pressure measurement system are welded and formed in the form of back pipes, and are respectively connected to the differential pressure measurement elements arranged outside the flue.

The measurement method of the matrix type full flue gas flow measuring device of the present invention is as follows: the flue is divided into several rectangular areas with the same area, each rectangular area is provided with a measuring unit, so that each rectangular area has The pressure point can measure the total pressure and static pressure; in this way, there will be several measuring units with the same area in the flue, and the total pressure and static pressure collected by these measuring units will be input into the differential pressure measuring element, and the average value will be calculated , to obtain the average total pressure and average static pressure of the flue cross-section, and the average measured differential pressure of the entire flue gas can be obtained through calculation. According to the average differential pressure, the flow velocity of the entire section can be calculated more accurately. According to the velocity area method, according to the area of the flue section, the flow data of the flue can be obtained, so as to better reflect the flue gas under this working condition Happening.

In an embodiment of the present utility model, both the pressure introduction main circuit 4 and the pressure introduction pipe 5 are 316L stainless steel pipes with a diameter of Φ33.7×3.5mm and a polytetrafluoroethylene coating. PTFE has the characteristics of ultra-low friction coefficient and surface energy. Its friction coefficient is the lowest among all plastics, and its surface energy is also the lowest among all solid materials. These characteristics make it difficult for smoke to adhere to its surface. , so the 316L stainless steel pipe with PTFE coating can effectively prevent the pipeline from clogging. In addition, according to the actual use of the industrial site, it can be considered to increase the compressed air blowing device to further prevent pipeline blockage.

In one embodiment of the present invention, the size of the flue gas flow measuring device can be customized according to the size of the flue, and the number of measuring units 3 can be increased or decreased proportionally.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be construed as limitations of the present invention. The above-mentioned embodiments can be changed, modified, replaced and modified within the scope of the present utility model under the principle and purpose. The scope of the invention is defined by the appended claims and their equivalents.

Claims (7)

1. A matrix type full flue gas flow measuring device is characterized in that: it comprises a total pressure measurement system (1), a static pressure measurement system (2), a differential pressure measurement element and a fixture; the total pressure measurement system (1 ) is composed of several measuring units (3), each measuring unit includes a pressure guiding main circuit (4) and a pressure guiding pipe (5) connected to the bottom of the pressure guiding main circuit (4), and the pressure guiding main circuit (4) is fixed through The parts are fixed in the flue, and the mouth of the pressure pipe (5) of the total pressure measurement system (1) is facing the direction of the flue gas flow; the static pressure measurement system (2) is arranged in parallel behind the total pressure measurement system (1) On the back side, its structure is the same as that of the total pressure measurement system (1), and the nozzle of the pressure induction pipe faces away from the direction of flue gas flow; the total pressure measurement system (1) and the static pressure measurement system (2) are respectively arranged outside the flue The differential pressure measuring element connection. 2. The matrix-type full flue gas flow measurement device according to claim 1, characterized in that: the total pressure measurement system (1) and the static pressure measurement system (2) are two independent structural parts, in the form of a backrest tube Welded and formed. 3. The matrix-type full flue gas flow measurement device according to claim 1, characterized in that: said pressure introduction trunk (4) and pressure introduction pipe (5) are 316L stainless steel pipes with polytetrafluoroethylene coating . 4. The matrix-type full flue gas flow measuring device according to claim 1 or 3, characterized in that: the main pressure induction road (4) and the pressure induction pipe (5) are circular pipes of Φ33.7×3.5mm. 5. The matrix-type full flue gas flow measurement device according to claim 1, characterized in that: said pressure induction trunk (4) and pressure induction pipe (5) consider increasing compressed air purge according to the actual use of the industrial site device to prevent pipeline blockage. 6. The matrix type full flue gas flow measurement device according to claim 1, characterized in that: the peripheral frame size of the matrix type full flue gas flow measurement device is customized according to the flue size, and the measurement unit (3) Quantities increase and decrease proportionally. 7. The matrix type full flue gas flow measurement device according to claim 1, characterized in that: the differential pressure measuring element is a micro differential pressure sensor.