CN207180778U - The online purging system of volume measuring pipe in the Chinese mound of air channel of thermal power plant - Google Patents
The online purging system of volume measuring pipe in the Chinese mound of air channel of thermal power plant Download PDFInfo
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- CN207180778U CN207180778U CN201721179395.1U CN201721179395U CN207180778U CN 207180778 U CN207180778 U CN 207180778U CN 201721179395 U CN201721179395 U CN 201721179395U CN 207180778 U CN207180778 U CN 207180778U
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Abstract
The utility model discloses the online purging system of volume measuring pipe in a kind of Chinese mound of air channel of thermal power plant, solves the problems, such as that burning accident occurs greatly and easily for Venturi meter existing workload when dust is cleared up.In Venturi meter（3）Air intake vent front side top primary air intake pipe（1）Madial wall on be provided with compressed air blast pipe（6）, compressed air blast pipe（6）Axis and primary air intake pipe（1）Axis be arranged substantially perpendicular to each other；In compressed air blast pipe（6）Lower end be connected with purging shower head pipe（7）, purge shower head pipe（7）Axis and primary air intake pipe（1）The angle of axis be 45 °；Reach primary air intake pipe（1）Outside compressed air blast pipe（6）On be provided with compressed air shut-off valve（8）, in compressed air blast pipe（6）Upper end be connected with compressed air intake line（9）.Ensure the accuracy of Venturi measuring and the safety progress of production.
Description
Technical field
The present invention relates to a kind of purging system of the apparatus for measuring air quantity in power plant boiler air channel, more particularly to a kind of fire
It is used for the online purging system for measuring the Venturi meter of air quantity in air channel of boiler of power plant or secondary air duct.
Background technology
At present, an air channel and secondary air duct are provided with the boiler in thermal power plant, for being provided for boiler combustion
Air quantity.In order to which the number of inlet air of boiler amount controlled, to improve the efficiency of combustion of boiler, air measuring is typically provided with air channel
Device.Apparatus for measuring air quantity is made up of differential pressure measurement pipe and differential pressure transmitter；Differential pressure measurement pipe has polytype, wherein comparing
More common is Venturi meter.Venturi meter can be measured by its distinctive reducing section and flow through gas in pipe
The dynamic pressure of stream, so as to calculate the flow velocity of gas.Into boiler once, Secondary Air needs to first pass through air preheater and added
Heat, then pass through once again, secondary air channel is blown into boiler.Because air preheater is preheated with ash-laden gas, pre-
In thermal process, the dust in flue gas will be attached on heat exchanger fin, when passing through preheater for the air of boiler air feed, will be incited somebody to action
The dust being attached on heat exchanger fin is brought into once, in secondary wind inleting tube.The dust part brought into can be attached to venturi survey
On buret, so as to change the reducing section of Venturi meter, the degree of accuracy of air measuring is seriously affected.In order to overcome
This defect, existing method are usually to remove differential pressure transmitter, are measured in the outside of differential pressure transmitter interface to venturi
Gases at high pressure, the laying dust that purging is cleared up on the inside of Venturi tube are blown into pipe.The work of dismounting differential pressure transmitter be present in this method
Amount is big, and air quantity interrupts time of measuring length, especially because the wind-warm syndrome in an air channel is up to 270 DEG C, easily from differential pressure transmitter
Interface is blown to outside airduct, causes personnel's burning accident.
The content of the invention
The invention provides the online purging system of volume measuring pipe in a kind of Chinese mound of air channel of thermal power plant, solve
The problem of Venturi meter existing workload when dust is cleared up is big and burning accident easily occurs.
The present invention is that solve above technical problem by the following technical programs：
The online purging system of volume measuring pipe in a kind of Chinese mound of air channel of thermal power plant, including primary air intake pipe,
Venturi meter support frame is provided with primary air intake pipe, literary mound is fixedly installed on Venturi meter support frame
In measurement pipe, what the axis of Venturi meter and the axis of primary air intake pipe were parallel to, in First air
The outside of blast pipe is provided with differential pressure transmitter, differential pressure pipe is connected between Venturi meter and differential pressure transmitter, in text
Compressed air blast pipe is provided with mound on the madial wall of the primary air intake pipe of the air intake vent front side top of measurement pipe, compression is empty
The axis of gas blast pipe and the axis of primary air intake pipe are arranged substantially perpendicular to each other；In the lower end of compressed air blast pipe
Purging shower head pipe is connected with, the angle for purging the axis of shower head pipe and the axis of primary air intake pipe is 45 degree；Reach
Compressed air shut-off valve is provided with compressed air blast pipe outside primary air intake pipe, in the upper end of compressed air blast pipe
It is connected with compressed air intake line.
The vertical range for purging the central point of the shower head pipe lower end mouth of pipe and the axis of Venturi meter is 0.5 meter, pressure
The horizontal range of the axis of contracting air blast pipe and the air inlet longitudinal cross-section of Venturi meter is 0.5 meter；Compressed air
Air pressure in intake line is 50 times of blast in primary air intake pipe.
The present invention is purged by high-pressure compressed air timing to Venturi nozzle inside dust stratification, so as to ensure literary mound
In pipe measure accuracy, ensure production safe and smooth progress.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention.
Embodiment
The present invention is described in detail below in conjunction with the accompanying drawings：
The online purging system of volume measuring pipe in a kind of Chinese mound of air channel of thermal power plant, including primary air intake pipe 1,
Venturi meter support frame 2 is provided with primary air intake pipe 1, is fixedly installed on Venturi meter support frame 2
Venturi meter 3, what the axis of Venturi meter 3 was parallel to the axis of primary air intake pipe 1,
The outside of primary air intake pipe 1 is provided with differential pressure transmitter 5, and difference is connected between Venturi meter 3 and differential pressure transmitter 5
Pressure pipe 4, compressed air is provided with the madial wall of the primary air intake pipe 1 of the air intake vent front side top of Venturi meter 3
Blast pipe 6, the axis of compressed air blast pipe 6 and the axis of primary air intake pipe 1 are arranged substantially perpendicular to each other；Compressing
The lower end of air blast pipe 6 is connected with purging shower head pipe 7, purges the axis of shower head pipe 7 and the axis of primary air intake pipe 1
Angle be 45 °；Reach and be provided with compressed air shut-off valve 8 on the compressed air blast pipe 6 outside primary air intake pipe 1,
Compressed air intake line 9 is connected with the upper end of compressed air blast pipe 6.
The vertical range for purging the central point of the lower end mouth of pipe of shower head pipe 7 and the axis of Venturi meter 3 is 0.5 meter,
The horizontal range of the axis of compressed air blast pipe 6 and the air inlet longitudinal cross-section of Venturi meter 3 is 0.5 meter.In order to
The form of the inlet flow field of Venturi meter 3 is not interfered with, therefore, the axis of compressed air blast pipe 6 and Venturi meter 3
The distance in air inlet section can not be too near, and it is suitable to find 0.5 meter by how many experiments.In order to ensure purging effect, compression
Air pressure in air input passageway 9 is greater than 50 times equal to blast in primary air intake pipe 1.Root is wanted when testing at the scene
Compressed air shut-off valve 8 is opened in time according to the change of flowmeter to be purged, purge time is usually 2 minutes.
Claims (2)
1. the online purging system of volume measuring pipe in a kind of Chinese mound of air channel of thermal power plant, including primary air intake pipe（1）,
In primary air intake pipe（1）In be provided with Venturi meter support frame（2）, in Venturi meter support frame（2）Upper fixation
It is provided with Venturi meter（3）, Venturi meter（3）Axis and primary air intake pipe（1）Axis be each other
It is arranged in parallel, in primary air intake pipe（1）Outside be provided with differential pressure transmitter（5）, in Venturi meter（3）With differential pressure
Transmitter（5）Between be connected with differential pressure pipe（4）, it is characterised in that in Venturi meter（3）Air intake vent front side top one
Secondary wind blast pipe（1）Madial wall on be provided with compressed air blast pipe（6）, compressed air blast pipe（6）Axis and one
Secondary wind blast pipe（1）Axis be arranged substantially perpendicular to each other；In compressed air blast pipe（6）Lower end be connected with purging shower nozzle
Pipe（7）, purge shower head pipe（7）Axis and primary air intake pipe（1）The angle of axis be 45 °；Reach First air
Blast pipe（1）Outside compressed air blast pipe（6）On be provided with compressed air shut-off valve（8）, in compressed air blast pipe（6）
Upper end be connected with compressed air intake line（9）.
2. the online purging system of volume measuring pipe in the Chinese mound of air channel of thermal power plant according to claim 1, it is special
Sign is, purges shower head pipe（7）The central point and Venturi meter of the lower end mouth of pipe（3）Axis vertical range be 0.5
Rice, compressed air blast pipe（6）Axis and Venturi meter（3）Air inlet longitudinal cross-section horizontal range be 0.5
Rice；Compressed air intake line（9）In air pressure be primary air intake pipe（1）50 times of middle blast.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721179395.1U CN207180778U (en) | 2017-09-14 | 2017-09-14 | The online purging system of volume measuring pipe in the Chinese mound of air channel of thermal power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721179395.1U CN207180778U (en) | 2017-09-14 | 2017-09-14 | The online purging system of volume measuring pipe in the Chinese mound of air channel of thermal power plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207180778U true CN207180778U (en) | 2018-04-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721179395.1U Active CN207180778U (en) | 2017-09-14 | 2017-09-14 | The online purging system of volume measuring pipe in the Chinese mound of air channel of thermal power plant |
Country Status (1)
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| CN (1) | CN207180778U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107631766A (en) * | 2017-09-14 | 2018-01-26 | 国网山西省电力公司电力科学研究院 | The online purging system of volume measuring pipe in the Chinese mound of air channel of thermal power plant |
-
2017
- 2017-09-14 CN CN201721179395.1U patent/CN207180778U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107631766A (en) * | 2017-09-14 | 2018-01-26 | 国网山西省电力公司电力科学研究院 | The online purging system of volume measuring pipe in the Chinese mound of air channel of thermal power plant |
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