CN112964315A - Array type flow measuring device for large vertical smoke wind pulverized coal pipeline - Google Patents
Array type flow measuring device for large vertical smoke wind pulverized coal pipeline Download PDFInfo
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- CN112964315A CN112964315A CN202110385250.1A CN202110385250A CN112964315A CN 112964315 A CN112964315 A CN 112964315A CN 202110385250 A CN202110385250 A CN 202110385250A CN 112964315 A CN112964315 A CN 112964315A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
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Abstract
The invention discloses an array type flow measuring device for a large-scale vertical smoke and air pulverized coal pipeline, wherein the front end of a dynamic pressure expansion buffer tube and the upper end of a static pressure expansion buffer tube are obliquely inserted into the smoke and air pulverized coal pipeline, the lower end of the dynamic pressure expansion buffer tube and the lower end of the static pressure expansion buffer tube are closed, each wedge-shaped dynamic pressure sensor is communicated with the dynamic pressure expansion buffer tube, each parallel static pressure sensor is respectively communicated with the static pressure expansion buffer tube, each wedge-shaped dynamic pressure sensor and each parallel static pressure sensor are positioned in the smoke and air pulverized coal pipeline, the upper end of the dynamic pressure expansion buffer tube is provided with a dynamic pressure sampling hole, the upper end of the static pressure expansion buffer tube is provided with a static pressure sampling hole, each wedge-shaped dynamic pressure sensor is over against the air flow direction in the smoke and air pulverized coal pipeline, the opening direction of each parallel static pressure sensor is parallel to the air flow direction in the smoke and air pulverized coal pipeline, and the device can effectively solve the problem of measuring.
Description
Technical Field
The invention belongs to the technical field of monitoring and control of power station boilers, and relates to an array type flow measuring device for a large vertical smoke wind pulverized coal pipeline.
Background
The flow measurement of a large-scale flue gas pulverized coal pipeline of a thermal power plant relates to the wind-coal ratio, the automatic control level and the safe and economic operation of the thermal power plant, and the measurement of airflow with pulverized coal is a big problem troubling the power plant at present. The problem of measurement of the pulverized coal-carrying airflow is solved by solving two problems, namely the first problem of abrasion resistance, blockage prevention, high temperature resistance and corrosion resistance, and the second problem of uneven distribution of flow velocity in the pipe of a large-scale flue gas pulverized coal pipeline. For the first kind of problems, different media and different materials can be adopted for solving, and the core of the design is the problems of applicability and economy of material selection, for example, 12Cr1MoV is needed for high-temperature furnace smoke, 316L stainless steel or even higher anticorrosion material is needed for a flue after desulfurization, for a pulverized coal pipeline, the wear resistance is needed to be more excellent, and the design adopts high-price hard alloy and stainless steel for ingenious matching. For the second kind of problems, the thermal power plant generally adopts array type measuring device to the powder-carrying airflow measurement of large-scale flue gas pulverized coal pipeline at present, array type air volume measuring device is very suitable for horizontal flue, buggy or smoke and dust are difficult to pile up, fall into flue gas pulverized coal pipeline through natural settling, and for vertical pipeline, because of structural reasons, present array type flow measuring device can't solve the deposition and stifled grey problem, even some adopt compressed air to sweep, maintainer frequently sweeps and artifical deashing, some still design into complicated compressed air automatic blowback and sweep device, the design is complicated, with high costs, the trouble is frequent, still can't thoroughly solve stifled grey difficult problem, and cause the event that the changer damaged because of compressed air sweeps sometimes, bury hidden danger for power station boiler safe economic operation.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an array type flow measuring device for a large vertical flue gas pulverized coal pipeline, which can effectively solve the problem of measuring pulverized coal flow of the large vertical flue gas pulverized coal pipeline.
In order to achieve the purpose, the large-scale vertical smoke and wind coal powder pipeline array type flow measuring device comprises a dynamic pressure expansion buffer pipe, a static pressure expansion buffer pipe, a wedge-shaped dynamic pressure sensor, a parallel static pressure sensor, a dynamic pressure transmission pipe, a static pressure transmission pipe, a dynamic pressure sampling hole, a static pressure sampling hole and a dust discharge sealing plug;
the front end of the dynamic pressure capacity expansion buffer tube and the upper end of the static pressure capacity expansion buffer tube are obliquely inserted into the smoke wind pulverized coal pipeline, the lower end of the dynamic pressure capacity expansion buffer tube and the lower end of the static pressure capacity expansion buffer tube are closed, each wedge-shaped dynamic pressure sensor is communicated with the dynamic pressure capacity expansion buffer tube, each parallel static pressure sensor is respectively communicated with the static pressure capacity expansion buffer tube, each wedge-shaped dynamic pressure sensor and each parallel static pressure sensor are respectively positioned in the smoke wind pulverized coal pipeline, the upper end of the dynamic pressure capacity expansion buffer tube is provided with a dynamic pressure sampling hole, the upper end of the static pressure buffer tube is provided with a static pressure sampling hole, each wedge-shaped dynamic pressure sensor is over against the airflow direction in the smoke wind pulverized coal pipeline, and the opening direction of each parallel static pressure sensor is parallel to the airflow direction in the.
The wedge-shaped dynamic pressure sensor is communicated with the dynamic pressure expansion buffer tube through a dynamic pressure transmitting tube.
The parallel static pressure sensor is communicated with the static pressure expansion buffer tube through a static pressure transmitting tube.
The lower end of the dynamic pressure dilatation buffer tube and the lower end of the static pressure dilatation buffer tube are both sealed by the ash discharge sealing plug.
The dynamic pressure expansion buffer tube and the static pressure expansion buffer tube are welded back to back.
The smoke air pulverized coal pipeline forms an included angle of 45 degrees with the dynamic pressure dilatation buffer pipe and the static pressure dilatation buffer pipe.
The wedge-shaped dynamic pressure sensor is a 75-degree wedge-shaped dynamic pressure sensor, and an included angle of 45 degrees is formed between the wedge-shaped dynamic pressure sensor and the dynamic pressure expansion buffer tube.
The number of the wedge-shaped dynamic pressure sensors is the same as that of the parallel static pressure sensors, one wedge-shaped dynamic pressure sensor and one parallel static pressure sensor form a pair of sensors, and each pair of sensors are arranged in the smoke wind pulverized coal pipeline in an equal section mode.
The invention has the following beneficial effects:
when the large-scale vertical flue gas pulverized coal pipeline array type flow measuring device is specifically operated, all the wedge-shaped dynamic pressure sensors are communicated with the dynamic pressure transmitting pipe, the internal airflow is not uniform and disturbed in the actual operation, namely the pressure of all the wedge-shaped dynamic pressure sensors is different, so that dust or pulverized coal is blown out from one side with lower pressure, and even if a small amount of dust enters the dynamic pressure expansion buffer pipe or the static pressure expansion buffer pipe, the dust can be buffered and settled in the expansion buffer pipe in the operation due to the inclined arrangement mode, and finally blown out from the sensor probe with lower bottom pressure, so that the problems of dust accumulation and dust blockage are solved, and the problem of measuring the pulverized coal airflow carried by the large-scale vertical flue gas pulverized coal pipeline is solved.
Drawings
FIG. 1 is a schematic view of the installation of the present invention;
FIG. 2 is a partial view of a dynamic pressure sampling hole and a static pressure sampling hole of the present invention;
FIG. 3 is a top view of the present invention;
fig. 4 is a view showing the installation position of the wedge-type dynamic pressure sensor according to the present invention.
Wherein, 1 is dynamic pressure dilatation buffer pipe, 2 is static pressure dilatation buffer pipe, 3 is the dynamic pressure sensor of wedge type, 4 is parallel static pressure sensor, 5 is the dynamic pressure transmitting pipe, 6 is the static pressure transmitting pipe, 7 is the dynamic pressure thief hole, 8 is the static pressure thief hole, 9 is the ash discharge seal plug, 10 is the flue gas pulverized coal pipeline.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1 to 4, the large-scale vertical flue gas pulverized coal pipeline array type flow measuring device of the present invention includes a dynamic pressure expansion buffer tube 1, a static pressure expansion buffer tube 2, a wedge type dynamic pressure sensor 3, a parallel static pressure sensor 4, a dynamic pressure transmitting tube 5, a static pressure transmitting tube 6, a dynamic pressure sampling hole 7, a static pressure sampling hole 8, and a dust discharge sealing plug 9; the front end of a dynamic pressure dilatation buffer pipe 1 and the upper end of a static pressure dilatation buffer pipe 2 are obliquely inserted into a smoke and wind pulverized coal pipeline 10, the lower end of the dynamic pressure dilatation buffer pipe 1 and the lower end of the static pressure dilatation buffer pipe 2 are closed, each wedge-shaped dynamic pressure sensor 3 is communicated on the dynamic pressure dilatation buffer pipe 1, each parallel static pressure sensor 4 is respectively communicated on the static pressure dilatation buffer pipe 2, each wedge-shaped dynamic pressure sensor 3 and each parallel static pressure sensor 4 are both positioned in the smoke and wind pulverized coal pipeline 10, a dynamic pressure sampling hole 7 is arranged at the upper end of the dynamic pressure dilatation buffer pipe 1, a static pressure sampling hole 8 is arranged at the upper end of the static pressure buffer pipe 2, each wedge-shaped dynamic pressure sensor 3 is just opposite to the airflow direction in the smoke and wind pulverized coal pipeline 10, and the opening direction of each parallel static pressure sensor 4 is parallel to the airflow direction in the smoke and wind pulverized.
The wedge-shaped dynamic pressure sensor 3 is communicated with the dynamic pressure expansion buffer tube 1 through a dynamic pressure transmitting tube 5; the parallel static pressure sensor 4 is communicated with the static pressure expansion buffer tube 2 through a static pressure transmission tube 6; the lower end of the dynamic pressure dilatation buffer tube 1 and the lower end of the static pressure dilatation buffer tube 2 are both sealed by an ash discharge sealing plug 9.
The dynamic pressure dilatation buffer tube 1 and the static pressure dilatation buffer tube 2 are welded back to back; the smoke air pulverized coal pipeline 10 forms an included angle of 45 degrees with the dynamic pressure dilatation buffer pipe 1 and the static pressure dilatation buffer pipe 2; the wedge-shaped dynamic pressure sensor 3 is a 75-degree wedge-shaped dynamic pressure sensor, and an included angle of 45 degrees is formed between the wedge-shaped dynamic pressure sensor 3 and the dynamic pressure expansion buffer tube 1; the number of the wedge-shaped dynamic pressure sensors 3 is the same as that of the parallel static pressure sensors 4, one wedge-shaped dynamic pressure sensor 3 and one parallel static pressure sensor 4 form a pair of sensors, and each pair of sensors are arranged in the smoke wind coal powder pipeline 10 in an equal section mode.
The dynamic pressure expansion buffer tube 1 is arranged on the windward side, and the static pressure expansion buffer tube 2 is arranged on the leeward side.
The invention does not need to be provided with an external blowing device, is wear-resistant and anti-blocking, and automatically blows and removes dust by using the medium fluctuation in the smoke wind coal powder pipeline 10.
The specific working process of the invention is as follows:
firstly, the invention is installed on a vertical smoke wind coal powder pipeline 10 in an inclined way of 45 degrees, wherein, a wedge-shaped dynamic pressure sensor 3 is designed and installed for facing the wind and forms an included angle of 45 degrees with a dynamic pressure expansion buffer tube 1. The static pressure transmitting pipe 6 is provided with a parallel static pressure sensor 4 which is parallel to the airflow direction and is used for sensing the static pressure in the smoke wind coal powder pipeline 10, when the dust-carrying airflow flows in the smoke wind coal powder pipeline 10, the windward side is impacted by the airflow, the pressure is higher, the pressure is called dynamic pressure, the pressure of the parallel static pressure sensor 4 at the leeward side is lower and is used for sensing the static pressure in the smoke wind coal powder pipeline 10, the difference between the dynamic pressure detected by the wedge-shaped dynamic pressure sensor 3 and the static pressure detected by the parallel static pressure sensor 4 is used as differential pressure, the magnitude of the differential pressure is in direct proportion to the square of the wind speed in the smoke wind coal powder pipeline 10, each wedge-shaped dynamic pressure sensor 3 transmits the pressure to a dynamic pressure expansion buffer pipe 1 for automatic pressure averaging, each parallel static pressure sensor 4 transmits the pressure to a static pressure expansion 2 for automatic pressure averaging, the average differential pressure of the whole dynamic pressure expansion buffer pipe 1 and the static pressure expansion differential pressure 2 are measured through a dynamic pressure sampling hole 7 and, used for calculating the medium flow and the flow speed of the pipeline.
When the dust-carrying airflow flows through the invention, dust or coal dust is inevitably brought into the wedge-shaped dynamic pressure sensors 3 and the dynamic pressure transmitting pipes 5, the invention is provided with a plurality of wedge-shaped dynamic pressure sensors 3 and dynamic pressure transmitting pipes 5, and the wedge-shaped dynamic pressure sensors 3 and the dynamic pressure transmitting pipes 5 are communicated with each other, and the internal airflow is uneven and disturbed in the actual operation, namely the pressure of each wedge-shaped dynamic pressure sensor 3 is different, so that the dust or coal dust is blown out from one side with lower pressure, and meanwhile, even a small amount of dust enters the dynamic pressure expansion buffer pipe 1 or the static pressure expansion buffer pipe 2. For some strip foreign matters with viscosity or large blocks which are easy to block, if the strip foreign matters cannot be blown out automatically for a long time, the strip foreign matters are manually removed through the ash discharge sealing plug 9, during measurement, the pressure difference between the dynamic pressure transmission pipe 5 and the static pressure transmission pipe 6 is measured through the dynamic pressure sampling hole 7 and the static pressure sampling hole 8 by means of an external differential pressure transmitter, and the flow speed or the flow rate in the pipes is accurately calculated by combining temperature and flow area correction.
When the device is installed, only a hole needs to be formed in the smoke air pulverized coal pipeline 10, the device is inserted into and fixed on the smoke air pulverized coal pipeline 10, two-wire transmitter signal wires are connected to a computer or a DCS system, configuration calculation of flow speed and flow can be carried out, and signals can be transmitted to the DCS system through a wireless network by adopting a wireless pressure transmitter.
The invention adopts the multipoint array type uniform-section probe arrangement, thoroughly solves the problem of measurement of the pulverized coal flow in the large-scale flue gas pulverized coal pipeline, is convenient to install and operate, is suitable for measurement of the pulverized coal flow in the total wind, coal mill outlet pipeline flow, flue gas flow and the like of a newly-built large-scale thermal power generating unit, improves and modifies the automation and control system level of the thermal power generating unit, and has remarkable economic benefit.
The technical idea of the present invention is described above only, and the scope of the present invention should not be limited thereby, and any modification made based on the technical idea of the present invention is within the scope of the present invention.
Claims (8)
1. A large-scale vertical smoke and wind coal dust pipeline array type flow measuring device is characterized by comprising a dynamic pressure expansion buffer tube (1), a static pressure expansion buffer tube (2), a wedge-shaped dynamic pressure sensor (3), a parallel static pressure sensor (4), a dynamic pressure transmitting tube (5), a static pressure transmitting tube (6), a dynamic pressure sampling hole (7), a static pressure sampling hole (8) and a dust discharge sealing plug (9);
the front end of a dynamic pressure expansion buffer tube (1) and the upper end of a static pressure expansion buffer tube (2) are obliquely inserted into a smoke wind coal powder pipeline (10), the lower end of the dynamic pressure expansion buffer tube (1) and the lower end of the static pressure expansion buffer tube (2) are closed, each cusp type dynamic pressure sensor (3) is communicated with the dynamic pressure expansion buffer tube (1), each parallel static pressure sensor (4) is communicated with the static pressure expansion buffer tube (2), each cusp type dynamic pressure sensor (3) and each parallel static pressure sensor (4) are located in the smoke wind coal powder pipeline (10), a dynamic pressure sampling hole (7) is arranged at the upper end of the dynamic pressure expansion buffer tube (1), a static pressure sampling hole (8) is arranged at the upper end of the static pressure expansion buffer tube (2), each cusp type dynamic pressure sensor (3) is over against the airflow direction in the smoke wind coal powder pipeline (10), and the opening direction of each parallel static pressure sensor (4) is parallel to the airflow direction in the smoke wind coal powder pipeline (10).
2. The large vertical smoke and air pulverized coal pipe array type flow measuring device according to claim 1, wherein the wedge-shaped dynamic pressure sensor (3) is communicated with the dynamic pressure expansion buffer pipe (1) through a dynamic pressure transmission pipe (5).
3. The large vertical smoke and coal powder pipe array type flow measuring device according to claim 1, wherein the parallel static pressure sensor (4) is communicated with the static pressure expansion buffer pipe (2) through a static pressure transmitting pipe (6).
4. The array type flow measuring device for the large vertical smoke and air coal powder pipeline according to claim 1, wherein the lower end of the dynamic pressure expansion buffer tube (1) and the lower end of the static pressure expansion buffer tube (2) are both closed by an ash discharge sealing plug (9).
5. The large vertical smoke and air pulverized coal pipe array type flow measuring device according to claim 1, wherein the dynamic pressure expansion buffer tube (1) and the static pressure expansion buffer tube (2) are welded back-to-back.
6. The large vertical smoke and air pulverized coal pipe array type flow measuring device according to claim 1, wherein the smoke and air pulverized coal pipe (10) forms an included angle of 45 degrees with the dynamic pressure expansion buffer pipe (1) and the static pressure expansion buffer pipe (2).
7. The large vertical smoke and air pulverized coal pipe array type flow measuring device according to claim 1, wherein the wedge-shaped dynamic pressure sensor (3) is a 75-degree wedge-shaped dynamic pressure sensor, and an included angle of 45 degrees is formed between the wedge-shaped dynamic pressure sensor (3) and the dynamic pressure expansion buffer tube (1).
8. The large vertical flue gas pulverized coal pipe array type flow measuring device according to claim 1, wherein the number of the wedge-shaped dynamic pressure sensors (3) is the same as the number of the parallel static pressure sensors (4), and one wedge-shaped dynamic pressure sensor (3) and one parallel static pressure sensor (4) form a pair of sensors, and each pair of sensors are arranged in the flue gas pulverized coal pipe (10) in an equal section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110385250.1A CN112964315A (en) | 2021-04-09 | 2021-04-09 | Array type flow measuring device for large vertical smoke wind pulverized coal pipeline |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110385250.1A CN112964315A (en) | 2021-04-09 | 2021-04-09 | Array type flow measuring device for large vertical smoke wind pulverized coal pipeline |
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| CN112964315A true CN112964315A (en) | 2021-06-15 |
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| CN202110385250.1A Pending CN112964315A (en) | 2021-04-09 | 2021-04-09 | Array type flow measuring device for large vertical smoke wind pulverized coal pipeline |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114062059A (en) * | 2021-11-22 | 2022-02-18 | 南京波瑞自动化科技有限公司 | Flue gas collecting and measuring system with non-uniform velocity field compensation |
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2021
- 2021-04-09 CN CN202110385250.1A patent/CN112964315A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114062059A (en) * | 2021-11-22 | 2022-02-18 | 南京波瑞自动化科技有限公司 | Flue gas collecting and measuring system with non-uniform velocity field compensation |
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