CN217111674U - Adjustable gas extraction system of gas renewal rate among normal position CO measurement system - Google Patents
Adjustable gas extraction system of gas renewal rate among normal position CO measurement system Download PDFInfo
- Publication number
- CN217111674U CN217111674U CN202122893846.0U CN202122893846U CN217111674U CN 217111674 U CN217111674 U CN 217111674U CN 202122893846 U CN202122893846 U CN 202122893846U CN 217111674 U CN217111674 U CN 217111674U
- Authority
- CN
- China
- Prior art keywords
- air
- air exhaust
- exhaust device
- gas
- connecting pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Sampling And Sample Adjustment (AREA)
Abstract
The utility model discloses an adjustable air exhaust system of gas renewal rate among normal position CO measurement system, including air exhaust device, appearance air cavity, air supply connecting pipe, air-vent valve and evacuation pipe, air exhaust device passes through mounting flange with appearance air cavity and is connected, and air exhaust device one side passes through the air supply connecting pipe with the air-vent valve and is connected, and the evacuation pipe is connected with the air exhaust device opposite side, and the air supply connecting pipe is in the aperture that forms the venturi effect in air exhaust device with evacuation union coupling. The air exhaust device is controlled by the external adjustable compressed air source pressure control valve to adjust the air exhaust force according to the requirement, and meanwhile, the fluctuation interference of the boiler load change (negative pressure extraction scheme) on the air exhaust force of the air exhaust pump can be eliminated.
Description
Technical Field
The utility model relates to an air exhaust system, concretely relates to adjustable air exhaust system of gas renewal speed among normal position CO measurement system.
Background
At present, the common measurement modes for monitoring the CO in boiler combustion mainly comprise technical schemes of electrochemistry, laser extraction measurement, laser in-situ measurement and the like, and the regional combustion insufficiency is often caused when the industrial field combustion is carried out, so that the CO is required to be accurately measured and the measurement time of the CO is shortened as much as possible for the combustion optimization control. The electrochemical and laser extraction type measuring scheme causes larger measurement delay due to the influence of temperature and heat tracing or the length of a dilution gas supply pipeline, the in-situ laser measuring mode is divided into a pair-through or open in-situ and an in-situ sampling mode, the phenomenon that a laser signal cannot be detected frequently occurs due to the vibration of a flue wall and the interference of dust (high temperature) and liquid water (low temperature) at a sampling point in the in-situ pair-through measuring mode, an instrument cannot be calibrated due to the fact that a relatively closed measuring cell is not available in the open in-situ measuring mode, and zero drift is serious, so that more and more in-situ sampling type laser measuring instruments tend to be used for realizing the online monitoring of CO.
The current in-situ sampling type CO on-line monitoring instrument filters and pretreats smoke due to the fact that a filter element for filtering dust is arranged at the front end of the in-situ sampling type CO on-line monitoring instrument, and the filtered smoke is measured by a gas absorption pool and then discharged by a sampling pump. The existing sampling pump is roughly divided into an internal sampling pump and an external sampling pump: external sampling pump, because of not high temperature resistant, life is shorter, expensive and maintenance cost is high, built-in venturi effect nozzle, because of the great risk that has the flue gas dilution of diluent gas air input, it is unstable also to cause the negative pressure by boiler load change influence simultaneously, causes the interference for flue gas sampling rate stability. And along with the increase of the operation time, the filter element can be blocked, so that the air suction force is insufficient, and the gas can not be updated.
SUMMERY OF THE UTILITY MODEL
The utility model provides a technical problem lie in overcoming the defect of flue gas sampling rate stability among the prior art, provide the adjustable air exhaust system of gas renewal rate among the normal position CO measurement system.
The utility model provides a following technical scheme:
the utility model provides an adjustable air exhaust system of gas renewal rate among normal position CO measurement system, includes air exhaust device, appearance air cavity, air supply connecting pipe, air-vent valve and evacuation pipe, air exhaust device passes through mounting flange with appearance air cavity and is connected, air exhaust device one side passes through the air supply connecting pipe with the air-vent valve and is connected, the evacuation pipe is connected with the air exhaust device opposite side, the air supply connecting pipe is in the aperture that forms the venturi effect in air exhaust device with the evacuation union coupling.
Furthermore, a filter element is installed at the front end of the sample air cavity, the flue gas enters the negative pressure hole of the air exhaust device after entering the sample air cavity through the filter element, and then is mixed with the diluent gas entering the air exhaust device through the air source connecting pipe, sent into the emptying pipe and then exhausted into the flue.
Further, a pitot tube flowmeter is arranged in a negative pressure hole of the air exhaust device and used for monitoring the flow entering the negative pressure hole of the air exhaust device in real time, and a pressure transmitter is arranged in the sample gas cavity and used for monitoring the negative pressure in the sample gas cavity in real time.
Further, the pitot tube flowmeter and the pressure transmitter are electrically connected with a pressure regulating controller, and the pressure regulating valve is also electrically connected with the pressure regulating controller.
Compared with the prior art, the beneficial effects of the utility model are that: the air exhaust device is controlled by the external adjustable compressed air source pressure control valve to adjust the air exhaust force according to the requirement, and meanwhile, the fluctuation interference of the boiler load change (negative pressure extraction scheme) on the air exhaust force of the air exhaust pump can be eliminated. Secondly, because of the filter core can appear the jam condition after using a period, the utility model discloses still can monitor according to the filter core jam condition, adjust air exhaust device's negative pressure intensity and vacuum flow through air inlet pressure adjustment simultaneously to guarantee the air exhaust flow of relatively stable, improve simultaneously and block up the threshold value, prolong the life of filter core.
Drawings
Fig. 1 is a schematic diagram of the whole system of the present invention.
Fig. 2 is a schematic structural view of the air extractor of the present invention.
FIG. 3 is a schematic illustration of the position of a pitot tube flow meter.
In the figure: 1. an air extraction device; 2. a pressure regulating valve; 3. emptying the pipe; 4. a pressure transmitter; 5. a pitot tube flow meter; 6. a filter element; 7. an air source connecting pipe; 8. a sample gas cavity; 9. a fixed flange; 10. a pressure regulating controller; 11. small holes of the venturi effect.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1-3, the gas pumping device with adjustable gas refresh rate in the in-situ CO measurement system of the present invention includes a gas pumping device 1, a sample gas chamber 8, a gas source connecting pipe 7, a pressure regulating valve 2 and an evacuation pipe 3.
The air extractor 1 is connected with the sample air cavity 8 through a screw on the fixed flange 9, and a sealing gasket is arranged in the middle.
One side of the air extracting device 1 is connected with the pressure regulating valve 2 through an air source connecting pipe 7, the joint is a clamping sleeve joint, high-pressure air enters the main body of the air extracting device 1 through the pressure regulating valve 2 through the air source connecting pipe 7 after pressure regulation, the emptying pipe 3 is connected with the other side of the air extracting device 1, the air source connecting pipe 7 is connected with the emptying pipe 3, a small hole 11 of a Venturi effect is formed in the air extracting device 1, and the air extracting device enters a flue through the emptying pipe 3 after passing through the small hole 11 of the Venturi effect.
At the moment, the negative pressure hole of the air exhaust device 1 generates negative pressure, the pressure is far lower than the pressure in the flue, the filter element 6 is installed at the front end of the sample air cavity 8, so that flue gas enters the negative pressure hole of the air exhaust device 1 after entering the sample air cavity 8 through the filter element 6, and then is mixed with the diluent gas entering the air exhaust device 1 through the air source connecting pipe 7 and discharged into the flue.
A pitot tube flowmeter 5 is arranged in a negative pressure hole of the air extractor 1, flow entering the negative pressure hole of the air extractor 1 is monitored in real time, and a pressure transmitter 4 is arranged in the sample air cavity 8 and used for monitoring negative pressure in the sample air cavity 8 in real time. The pitot tube flowmeter 5 and the pressure transmitter 4 are electrically connected to the pressure regulating controller 10, and the pressure regulating valve 2 is also electrically connected to the pressure regulating controller 10. The flow data monitored by the pitot tube flowmeter 5 and the negative pressure data monitored by the pressure transmitter 4 are remotely transmitted to the pressure regulating controller 10 in real time. The pressure regulation controller 10 sets the index pressure and flow in advance, and then regulates the pressure regulating valve 2 in real time according to the pressure change in the sample air chamber 8 and the flow fluctuation in the negative pressure hole of the air extractor 1, so as to ensure that the flow of gas update is constant or adjustable in a certain range according to the actual situation.
The pressure transmitter 4 is selected to have a range of-50 KPa to 50 KPa.
When the flow regulation is required, the setting parameters of the pressure regulation controller 10 can be regulated, and the pressure regulating valve 2 is directly controlled to regulate the dilution flow, so that the aim of regulating the gas updating rate in the sample gas cavity 8 is fulfilled; on the other hand, when the front-end filter element 6 is blocked, the pressure regulating controller 10 analyzes the data returned by the pressure transmitter 4 and the pitot tube flowmeter 5, and increases the opening degree of the pressure regulating valve 2 to ensure that the gas updating flow is stable. Over time, when the return data from pressure transmitter 4 exceeds the set value, pressure regulator controller 10 alarms, prompting the filter cartridge to be replaced.
The control logic can prolong the service life of the filter element to the maximum extent, and ensure the (stable) controllability of the gas updating speed during operation in the service life. Meanwhile, the maintenance frequency of the equipment is greatly reduced, the high-precision requirement and the continuous stability of the instrument monitoring are ensured, and the consumption of filter elements is reduced.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. The utility model provides an adjustable gas extraction system of gas renewal rate among normal position CO measurement system which characterized in that: including air exhaust device (1), appearance air cavity (8), air supply connecting pipe (7), air-vent valve (2) and evacuation pipe (3), air exhaust device (1) is connected through mounting flange (9) with appearance air cavity (8), air exhaust device (1) one side is connected through air supply connecting pipe (7) with air-vent valve (2), evacuation pipe (3) are connected with air exhaust device (1) opposite side, air supply connecting pipe (7) and evacuation pipe (3) are connected and are in aperture (11) that form the venturi effect in air exhaust device (1).
2. The in-situ CO measurement system with adjustable gas update rate as claimed in claim 1, wherein: the filter element (6) is installed at the front end of the sample air cavity (8), smoke enters the negative pressure hole of the air exhaust device (1) after entering the sample air cavity (8) through the filter element (6), and then is mixed with diluent gas entering the air exhaust device (1) through the air source connecting pipe (7) and sent into the emptying pipe (3) and then discharged into the flue.
3. The in-situ CO measurement system of claim 1 wherein the gas update rate adjustable pumping system is: a pitot tube flowmeter (5) is arranged in a negative pressure hole of the air extracting device (1) and used for monitoring the flow entering the negative pressure hole of the air extracting device (1) in real time, and a pressure transmitter (4) is arranged in the sample air cavity (8) and used for monitoring the negative pressure in the sample air cavity (8) in real time.
4. The in-situ CO measurement system of claim 3 wherein the gas update rate adjustable pumping system is: the pitot tube flowmeter (5) and the pressure transmitter (4) are electrically connected with the pressure regulating controller (10), and the pressure regulating valve (2) is also electrically connected with the pressure regulating controller (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122893846.0U CN217111674U (en) | 2021-11-24 | 2021-11-24 | Adjustable gas extraction system of gas renewal rate among normal position CO measurement system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122893846.0U CN217111674U (en) | 2021-11-24 | 2021-11-24 | Adjustable gas extraction system of gas renewal rate among normal position CO measurement system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217111674U true CN217111674U (en) | 2022-08-02 |
Family
ID=82589475
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122893846.0U Active CN217111674U (en) | 2021-11-24 | 2021-11-24 | Adjustable gas extraction system of gas renewal rate among normal position CO measurement system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217111674U (en) |
-
2021
- 2021-11-24 CN CN202122893846.0U patent/CN217111674U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109557009B (en) | Wide-range particulate matter detection device | |
| CN206020318U (en) | A kind of gas dew point analytical equipment | |
| CN217111674U (en) | Adjustable gas extraction system of gas renewal rate among normal position CO measurement system | |
| CN108731924B (en) | Gas turbine nozzle flow testing system and testing method based on Laval nozzle principle | |
| CN205981740U (en) | Flue gas able to programme prevents that stifled sampler pressure differential pressure sweeps control box | |
| CN112213460B (en) | Water quality detection method for water supply pipeline | |
| CN104502162A (en) | Dust sampler and dust concentration calibrating device using dust sampler | |
| CN109813850B (en) | Pretreatment device and pretreatment method for automatic control analyzer | |
| CN204346780U (en) | A kind of dust sampler and use the dust concentration caliberating device of this dust sampler | |
| CN208588695U (en) | A kind of explosion-proof type Oxygen Measuring Instrument | |
| CN103091376B (en) | A kind of liquid constant flow velocity on-line analysis monitoring device | |
| CN116086899A (en) | Flue gas sampling device and anti-blocking method | |
| CN205619984U (en) | Vacuum pre -conditioner increases humidity water flow monitoring device | |
| CN104374517B (en) | A kind of pressure-detecting device | |
| JPH0648379Y2 (en) | Gas analyzer | |
| CN113432933A (en) | Air pressure dynamic adjusting device | |
| CN208171575U (en) | Gas turbine nozzle flow testing system based on Laval nozzle principle | |
| CN208488430U (en) | Gas on-line detecting system | |
| CN203053910U (en) | Online liquid constant flow velocity analysis monitoring device | |
| CN112228622B (en) | Pilot-operated control type pipeline instrument root valve | |
| CN103866082B (en) | A kind of converter mouth micro-pressure-difference control method and device | |
| CN217278141U (en) | Flue gas on-line measuring device | |
| CN218546673U (en) | Be used for automatic cleaning device of denitration ammonia escape monitoring | |
| CN220752015U (en) | Measurement system for accurately measuring PH of absorption tower | |
| CN216132774U (en) | Air pressure dynamic adjusting device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |