CN203561645U - Probe for flow velocity of smoke - Google Patents
Probe for flow velocity of smoke Download PDFInfo
- Publication number
- CN203561645U CN203561645U CN201320725309.8U CN201320725309U CN203561645U CN 203561645 U CN203561645 U CN 203561645U CN 201320725309 U CN201320725309 U CN 201320725309U CN 203561645 U CN203561645 U CN 203561645U
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- tube
- dynamic pressure
- static
- flue gas
- flow rate
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Abstract
The utility model relates to a probe for the flow velocity of smoke in electric power industry. The probe comprises a Pitot tube body, the body comprises two cavities mutually separated, the two cavities are a dynamic pressure cavity and a static pressure cavity, one end of the Pitot tube body is connected with a dynamic pressure pipe communicated with the dynamic pressure cavity and a static pressure pipe communicated with the static pressure cavity, the static pressure pipe and the dynamic pressure pipe are both formed by pipes with cross sections which become gradually narrow from the connecting position of the Pitot tube body to end parts, and the static pressure pipe and the dynamic pressure pipe are arranged in contrary to form a cone-shaped structure. According to the probe for the flow velocity of the smoke, the pipe diameters of the static pressure pipe and the dynamic pressure pipe are increased, and a baffle at sampling openings of the static pressure pipe and the dynamic pressure pipe is cancelled so that the accumulation of impurities in the smoke at the sampling openings is reduced, and the accuracy and the stability of the measurement of the flow velocity of the smoke can be guaranteed; more especially, a nozzle connected with a timing device is respectively arranged in the static pressure cavity and the dynamic pressure cavity so that the probe can be cleaned at fixed-time by back blowing, and the effect of automatic cleaning of the probe is achieved.
Description
Technical field
The utility model relates to a kind of flue gas flow rate probe of power industry.
Background technology
At present, large-size thermal power plant is all provided with fume continuous automatic inspection system.Fume continuous automatic inspection system General Requirements is measured sulphuric dioxide, oxides of nitrogen, particle concentration and the relevant parameters such as Gas Parameters (temperature, pressure, flow velocity, oxygen level, humidity) thereof of flue gas.Wherein, the flow velocity of flue gas is an important parameter must measuring, the common flue gas flow rate probe of the measurement of flue gas flow rate at present has three kinds of different principle of compositionalities, be respectively pitot tube method, heat balance method of and supercritical ultrasonics technology, and wherein modal be exactly the flue gas flow rate probe that adopts pitot tube method to form.
Pitot tube has two pipes that gather flue gas, and a root canal orifice is dynamic pressure tube windward, and a root canal orifice is leeward is static tube, and the kinetic energy of the flue gas stream gathering is converted to pressure energy.While having air current flow in flue, dynamic pressure tube mouth of pipe windward side is subject to gas shock, thereby dynamic pressure tube overpressure is higher, and its pressure is called " total head ", the static tube mouth of pipe is leeward, owing to not being subject to air-flow punching press, the pressure in its pipe is static pressure, is called " static pressure ", the difference of total head and static pressure is called differential pressure, its size is relevant with inner tube smoke flow velocity, and flue gas flow rate is larger, and differential pressure is larger; Flow velocity is less, and differential pressure is also less, therefore, only measures the size of differential pressure, then finds out the corresponding relation of differential pressure and flow velocity, just can correctly measure discharge flue gas flow rate in pipe.
Existing pitot tube type flue gas flow rate probe adopts following structure: as shown in Figure 1, a kind of flue gas flow rate probe, it mainly comprises: pitot tube body.Pitot tube body forms two chambers spaced apart from each other: dynamic pressure cavity 5 and static pressure chamber 6.Body one end stretches out baffle plate 3 is set, and baffle plate 3 both sides in office are provided with dynamic pressure tube 1 and static tube 2, described dynamic pressure tube 1 and static tube 2 respectively by two ends to middle part gradually away from baffle plate 3.Described one end of dynamic pressure tube 1 and the dynamic pressure cavity of pitot tube 5 communicate, and the other end approaches baffle plate 3 ends and arranges; One end of static tube 2 communicates with the static pressure chamber 6 of pitot tube, and the other end approaches baffle plate 3 ends and arranges.The gap that described dynamic pressure tube 1, static tube 2 and baffle plate are 3 forms thief hatch 4.Flue gas flows into static tube 2 and dynamic pressure tube 1 by thief hatch 4, has just detected total head and the static pressure of flue gas, draws thus differential pressure, and by differential pressure judgement, is drawn the flow velocity of flue gas.
But, adopt the flue gas flow rate probe of said structure, the caliber of static tube and dynamic pressure tube is meticulous, and static tube and dynamic pressure tube and baffle plate hypotelorism, when in flue gas, particle concentration is higher, easily cause thief hatch to stop up, thereby cause, sampling is inhomogeneous even cannot be sampled, and affects the measurement of flue gas flow rate.
Based on needing above and shortcoming, the special the utility model that proposes.
Utility model content
The purpose of this utility model is for a kind of flue gas flow rate probe being provided, measuring the object of flue gas flow rate to reach probe under bad working environments.
The technical solution of the utility model is: a kind of flue gas flow rate probe, and it comprises, pitot tube body; Body forms two chambers spaced apart from each other, dynamic pressure cavity and static pressure chamber, and one end of described pitot tube body is connected with the dynamic pressure tube communicating with dynamic pressure cavity and the static tube communicating with static pressure chamber; Described static tube and dynamic pressure tube form by the pipeline that narrows gradually xsect to end with pitot tube body junction.
Further, the opposing setting of described static tube and dynamic pressure tube forms a pyramidal structure.
Further, described static tube and dynamic pressure tube form by half cone-shaped pipe, and the big opening end of static tube and dynamic pressure tube is all connected with pitot tube body.
Further, the static tube of described half cone-shaped and dynamic pressure tube are at a distance of the opposing setting of certain interval to form pyramidal structure, and the gap between static tube and dynamic pressure tube forms thief hatch.
Further, the caliber of described half cone-shaped dynamic pressure tube osculum end is d1,5mm<d1<10mm, preferably 8mm; The caliber of half cone-shaped static tube osculum end is d2,5mm<d2<10mm, preferably 8mm.
Further, it is an angle α that support or oppose the half cone-shaped static tube of setting and the line of symmetry of dynamic pressure tube and pitot tube body axis intersect, 15 degree < α <30 degree.
Further, in described pitot tube body, be provided with back-blowing device.
Further, described back-blowing device consists of shower nozzle, is respectively provided to a few shower nozzle in static pressure chamber and dynamic pressure cavity.Thereby, under the effect of shower nozzle, in static pressure chamber or dynamic pressure cavity, produce air-flow, blow to static tube or dynamic pressure tube port, so that the impurity of static tube or dynamic pressure tube port is blown away, avoided the generation of thief hatch latch up phenomenon.
Further, described shower nozzle is connected with timing device.Thereby, make to pop one's head in after work certain hour t, automatically open shower nozzle, thief hatch is regularly carried out to blowback clean, realized the effect of robotization processing shower nozzle.
The beneficial effects of the utility model are: by above-mentioned probe, make static tube and dynamic pressure tube form a taper, to reduce the head resistance of probe in flue.Meanwhile, by increasing the caliber of static tube and dynamic pressure tube, cancel the baffle plate at the thief hatch place of static tube and dynamic pressure tube, reduced the accumulation of the impurity in flue gas at thief hatch place, guaranteed the Stability and veracity that flue gas flow rate is measured.More particularly, by static pressure chamber and the nozzle that setting in dynamic pressure cavity is connected with timing device, realize the probe object that regularly blowback is cleaned, reached the effect of probe robotization cleaning.This new structure is simple, and effect is remarkable, suitable promoting the use of.
Figure of description
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Fig. 1 is the structural representation of prior art;
Fig. 2 is structural representation of the present utility model;
Fig. 3 is the preferred structural representation of the utility model;
Fig. 4 is the further preferred structural representation of the utility model.
Annex explanation: 1-dynamic pressure tube, 2-static tube, 3-baffle plate, 4-thief hatch, 5-dynamic pressure cavity, 6-static pressure chamber, 7-nozzle.
Embodiment
Embodiment 1
As shown in Figure 2, introduced a kind of flue gas flow rate probe in the present embodiment, it comprises, pitot tube body; Body forms two chambers spaced apart from each other, dynamic pressure cavity 5 and static pressure chamber 6, and one end of described pitot tube body is connected with the dynamic pressure tube 1 communicating with dynamic pressure cavity 5 and the static tube 2 communicating with static pressure chamber 6; Described static tube 2 and dynamic pressure tube 1 form by the pipeline that narrows gradually xsect to end with pitot tube body junction.
In the present embodiment, the opposing setting of described static tube 2 and dynamic pressure tube 1 forms a pyramidal structure, to reduce the head resistance of probe in flue.Described static tube 2 and dynamic pressure tube 1 form by half cone-shaped pipe, and the big opening end of static tube 2 and dynamic pressure tube 1 is all connected with pitot tube body.The static tube 2 of described half cone-shaped and dynamic pressure tube 1 is at a distance of the opposing setting of certain interval to form pyramidal structure, and the gap between static tube 2 and dynamic pressure tube 1 forms thief hatch 4.
In the present embodiment, the caliber of described half cone-shaped dynamic pressure tube 1 osculum end is d1,5mm<d1<10mm, preferably 8mm; The caliber of half cone-shaped static tube 2 osculum ends is d2,5mm<d2<10mm, preferably 8mm.By increasing the caliber of static tube and dynamic pressure tube, cancel the baffle plate at the thief hatch place of static tube and dynamic pressure tube, reduced the accumulation of the impurity in flue gas at thief hatch place, guaranteed the Stability and veracity that flue gas flow rate is measured.
In the present embodiment, introduced a kind of flue gas flow rate probe, it comprises, pitot tube body; Body forms two chambers spaced apart from each other, dynamic pressure cavity 5 and static pressure chamber 6, and one end of described pitot tube body is connected with the dynamic pressure tube 1 communicating with dynamic pressure cavity 5 and the static tube 2 communicating with static pressure chamber 6; Described static tube 2 and dynamic pressure tube 1 form by the pipeline that narrows gradually xsect to end with pitot tube body junction.
As shown in Figure 3, in the present embodiment, it is an angle α that support or oppose the half cone-shaped static tube 2 of setting and the line of symmetry of dynamic pressure tube 1 and pitot tube body axis intersect, 15 degree < α <30 degree.By by half cone-shaped static tube 2 and dynamic pressure tube 1 to flowing to along separate routes the direction angle that tilts in air channel, to increase the surface of contact of flue gas stream and thief hatch, improve the degree of accuracy of probe detection flow velocity.
As shown in Figure 4, in the present embodiment, in described pitot tube body, be provided with back-blowing device.Described back-blowing device consists of shower nozzle 7, is respectively provided to a few shower nozzle 7 in static tube 2 and dynamic pressure tube 1.Thereby, under the effect of shower nozzle, in static pressure chamber or dynamic pressure cavity, produce air-flow, blow to static tube or dynamic pressure tube port, so that the impurity of static tube or dynamic pressure tube port is blown away, avoided the generation of thief hatch latch up phenomenon.
In the present embodiment, described shower nozzle 7 is connected with timing device.Thereby, make to pop one's head in after work certain hour t, automatically open shower nozzle, thief hatch is regularly carried out to blowback clean, realized the effect of robotization processing shower nozzle.
It should be noted that; above-mentioned specific embodiment is only exemplary; under above-mentioned instruction of the present utility model, those skilled in the art can carry out various improvement and distortion on the basis of above-described embodiment, and these improvement or distortion drop in protection domain of the present utility model.
It will be understood by those skilled in the art that specific descriptions are above in order to explain the purpose of this utility model, not for limiting the utility model.Protection domain of the present utility model is limited by claim and equivalent thereof.
Claims (10)
1. a flue gas flow rate is popped one's head in, and it comprises, pitot tube body; Body forms two chambers spaced apart from each other, dynamic pressure cavity (5) and static pressure chamber (6), and one end of described pitot tube body is connected with the dynamic pressure tube (1) communicating with dynamic pressure cavity (5) and the static tube (2) communicating with static pressure chamber (6);
It is characterized in that: described static tube (2) and dynamic pressure tube (1) form by the pipeline that narrows gradually xsect to end with pitot tube body junction.
2. a kind of flue gas flow rate probe according to claim 1, is characterized in that: the opposing setting of described static tube (2) and dynamic pressure tube (1) forms a pyramidal structure.
3. a kind of flue gas flow rate probe according to claim 2, is characterized in that: described static tube (2) and dynamic pressure tube (1) form by half cone-shaped pipe, and the big opening end of static tube (2) and dynamic pressure tube (1) is all connected with pitot tube body.
4. a kind of flue gas flow rate according to claim 3 is popped one's head in, it is characterized in that: the static tube of described half cone-shaped (2) and dynamic pressure tube (1) at a distance of the opposing setting of certain interval to form pyramidal structure, the gap formation thief hatch (4) between static tube (2) and dynamic pressure tube (1).
5. a kind of flue gas flow rate probe according to claim 4, is characterized in that: the caliber of described half cone-shaped dynamic pressure tube (1) osculum end is d1,5mm<d1<10mm; The caliber of half cone-shaped static tube (2) osculum end is d2,5mm<d2<10mm.
6. a kind of flue gas flow rate probe according to claim 4, is characterized in that: the caliber of described half cone-shaped dynamic pressure tube (1) osculum end is d1=8mm; The caliber of half cone-shaped static tube (2) osculum end is d2=8mm.
7. a kind of flue gas flow rate according to claim 3 is popped one's head in, it is characterized in that: it is an angle α that support or oppose the half cone-shaped static tube (2) of setting and the line of symmetry of dynamic pressure tube (1) and pitot tube body axis intersect 15 degree < α <30 degree.
8. a kind of flue gas flow rate probe according to claim 1, is characterized in that: in described pitot tube body, be provided with back-blowing device.
9. a kind of flue gas flow rate probe according to claim 8, is characterized in that: described back-blowing device consists of shower nozzle, is respectively provided to a few shower nozzle (7) in static pressure chamber (6) and dynamic pressure cavity (5).
10. a kind of flue gas flow rate probe according to claim 9, is characterized in that: described shower nozzle (7) is connected with timing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320725309.8U CN203561645U (en) | 2013-11-15 | 2013-11-15 | Probe for flow velocity of smoke |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320725309.8U CN203561645U (en) | 2013-11-15 | 2013-11-15 | Probe for flow velocity of smoke |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203561645U true CN203561645U (en) | 2014-04-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320725309.8U Expired - Fee Related CN203561645U (en) | 2013-11-15 | 2013-11-15 | Probe for flow velocity of smoke |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203561645U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112763747A (en) * | 2020-12-02 | 2021-05-07 | 山东丽泽环境技术服务有限公司 | Flue gas flow velocity detection system and application method thereof |
| CN114199450A (en) * | 2021-12-15 | 2022-03-18 | 国家能源集团谏壁发电厂 | Pressure measuring probe, flue gas denitration full-section pressure distribution measuring device and measuring method |
-
2013
- 2013-11-15 CN CN201320725309.8U patent/CN203561645U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112763747A (en) * | 2020-12-02 | 2021-05-07 | 山东丽泽环境技术服务有限公司 | Flue gas flow velocity detection system and application method thereof |
| CN114199450A (en) * | 2021-12-15 | 2022-03-18 | 国家能源集团谏壁发电厂 | Pressure measuring probe, flue gas denitration full-section pressure distribution measuring device and measuring method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140423 Termination date: 20211115 |