CN214622303U - Be applied to flue gas circulation device that laser method ammonia escape detected - Google Patents
Be applied to flue gas circulation device that laser method ammonia escape detected Download PDFInfo
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- CN214622303U CN214622303U CN202120398337.8U CN202120398337U CN214622303U CN 214622303 U CN214622303 U CN 214622303U CN 202120398337 U CN202120398337 U CN 202120398337U CN 214622303 U CN214622303 U CN 214622303U
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Abstract
The utility model provides a be applied to flue gas circulation device that laser method ammonia escape detected, including sample circulation of gas room, the both ends of sample circulation of gas room all are equipped with coupling mechanism, and two coupling mechanism are connected with installation base one and installation base two respectively, and installation base one is connected with laser emission end, and installation base two is connected with the laser receiving terminal, and laser emission end and laser receiving terminal are located same water flat line, all install two transmission camera lenses in installation base one and the installation base two, and two transmission camera lenses insert sample circulation of gas indoor. The utility model discloses a cooling structure and two transmission lens cooperation can the protective apparatus not receive on the basis that high temperature damaged, improve the temperature of high temperature transmission lens end, avoid making high temperature transmission lens end surface local temperature reduce to below 220 ℃ because cooling gas cooling, lead to being surveyed the sample gas cooling and produce the sulphate crystallization, adhere to the transmissivity that reduces the camera lens on camera lens surface, make laser source can't pass the camera lens, and make equipment inefficacy.
Description
Technical Field
The utility model belongs to the technical field of the flue gas is handled, concretely relates to be applied to flue gas circulation device that laser method ammonia escape detected.
Background
According to the government environmental protection requirement, the coal-fired boiler is operated to realize ultra-low emission (NO in the discharged flue gas)X≤50mg、SO2Less than or equal to 35mg and less than or equal to 5mg of dust concentration). At present, the coal-fired boiler mainly adopts SCR ammonia method denitration, namely selective catalytic reduction denitration technology. Under the condition of catalyst and oxygen, at 320-427 deg.C, the reducing agent ammonia (anhydrous ammonia, ammonia water or urea pyrolysis) reacts selectively with NOx in the smoke gas to produce harmless nitrogen and water.
There is a very important index in the SCR denitration technology. It is the amount of ammonia injected that is in a suitable proportion to the NOx in the flue gas. Ideally the amount of ammonia that needs to be injected is just enough to react completely with the NOx in the flue gas. Neither in excess nor in deficiency. In actual operation it is not possible for the amount of ammonia to react exactly completely with the NOx in the flue gas. Therefore, the detection and control of whether the injected ammonia is excessive is a very important key link in the SCR denitration technology. And monitoring the ammonia content in the flue gas requires ammonia escape equipment. The most accurate ammonia escape equipment with the highest reliability is laser ammonia escape equipment.
The basic principle of ammonia escape equipment is a LasIR gas analyzer based on TDLAS (tunable diode laser absorption spectroscopy, laser method for short) technology, and the commonly used ammonia escape equipment mostly adopts a laser correlation mode, a laser source is additionally arranged in a flue, and the content of ammonia gas in flue gas on a certain line (an optical path through which laser penetrates) in the flue is detected.
However, because the ammonia escape device is installed on the original flue gas duct, the flue gas duct runs at a high temperature, and the temperature is changed along with the load of the group, the expansion deformation of the flue gas duct is variable, so that the laser correlation beam is deviated, and multiple times of maintenance and focusing are needed. The laser beam passes through a certain line in the flue, the ammonia escape equipment is generally arranged at the section from the outlet of the SCR reactor to the inlet of the air preheater, the flue has large area and no straight pipe section, so that the flue gas flow field is disordered, and the ammonia escape equipment at the outlet of the SCR is mostly arranged at one corner of the flue and cannot represent the content of the ammonia in the flue gas. And the ammonia escape equipment of normal position formula installation is because flue gas dust content is high, the component lacks the homogeneity, still often paroxysmal disturbance, normal position method laser ammonia escape analysis appearance is poor to the adaptability of this kind of special condition, so detection effect is poor, the precision is low, can not detect the trace escape ammonia about 1 ~ 2ppm even, this brings many problems with equipment operation and the production of enterprise, in order to solve this problem, adopt multipoint grid method flue gas extraction device now more, with the some sample gas of flue gas extraction in the flue, adopt the mode of bypass circulation, carry out the detection that NOx and ammonia escape respectively after the misce bene. The extracted sample gas is finally discharged into a flue at the outlet position of the air preheater.
The detection of ammonia escape after smoke extraction has two ways:
the first is to take out a small part of the sample gas (the diameter of the secondary sampling pipeline is less than 10mm, and the sampling gas quantity is less than 2L/min) and send the small part into a special gas chamber for measurement. However, the amount of the sample gas obtained by secondary sampling in the measurement mode is too small, ammonia in the sample gas is easy to adhere to the secondary sampling tube, the detection result of ammonia escape is small, the amount of the secondary sampling gas is too small, the volume of the gas chamber is large, the period of sample gas replacement is long, and the detection result is delayed.
The second method is that a laser ammonia escape analyzer is directly installed on a bypass after the extracted sample gas is uniformly mixed, and a flow-through chamber for installing the laser ammonia escape analyzer needs to be constructed on the bypass, so that the installation is equivalent to an in-situ method. The amount of the sample gas is more sufficient, the mixture is more uniform and representative, and the detection result is more accurate and sensitive. However, there are also several problems:
1. in order to protect equipment from being damaged by high temperature, cold compressed air is continuously pumped into an ammonia escape laser head, and air is used for equipment protection and lens cleaning. For the flue gas in the whole flue, the proportion of the injected cold air is small, and the temperature in the flue cannot be reduced. However, for the sample gas in the extracted branch, the amount of the cold gas filled in the ammonia escape device is larger than that of the sample gas, and the sample gas is diluted.
2. The components of the flue gas are complex, particularly the flue gas contains more dust, the components of the flue gas are stable at high temperature (220-380 ℃), the dust is dry, but ammonium salt crystallization can occur when the temperature of the extracted flue gas is reduced after cold air intervenes, and some sulfate mixed dust is finally agglomerated to block a sampling system.
3. In order to avoid mixing cold gas and ensure the isolation of sample gas and the outside, a glass lens is arranged on a circulating chamber, ammonia escape equipment is arranged outside the lens for measurement, but the outside of the lens is cold, so the temperature of the inner surface of the lens is reduced relative to the sample gas, the transmittance of laser is reduced due to the attachment of ammonium salt or dust, and the lens finally fails completely and cannot be used.
4. The glass lens on the circulation chamber is easy to interfere with laser equipment due to optical factors such as light reflection and the like, and is not beneficial to noise reduction treatment of laser ammonia escape equipment detection.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a be applied to flue gas circulation device that laser method ammonia escape detected, overcome the above-mentioned technical problem that exists among the prior art.
Therefore, the utility model provides a technical scheme as follows:
a flue gas circulation device applied to ammonia escape detection by a laser method comprises a sample gas circulation chamber, wherein two ends of the sample gas circulation chamber are respectively provided with a connecting mechanism, the two connecting mechanisms are respectively connected with a first mounting base and a second mounting base, the first mounting base is connected with a laser emitting end, the second mounting base is connected with a laser receiving end, the laser emitting end and the laser receiving end are positioned on the same horizontal line, double transmission lenses are respectively arranged in the first mounting base and the second mounting base, and the double transmission lenses are inserted into the sample gas circulation chamber;
the upside and the downside of appearance circulation of gas room communicate appearance gas access passage and appearance gas exhaust passage respectively, appearance gas access passage is close to installation base one, appearance gas exhaust passage is close to installation base two, the flowmeter is equipped with on the appearance gas access passage, air conditioning import one has been seted up to laser emission end, installation base one is close to laser emission end one end and has been seted up air conditioning export one.
The double-transmission lens comprises a high-temperature transmission lens and a low-temperature transmission lens, air is arranged between the high-temperature transmission lens and the low-temperature transmission lens, and the low-temperature transmission lens is close to the first cold air outlet.
The sample gas circulation chamber forms an included angle of 5-30 degrees with the horizontal direction, and the side where the sample gas inlet channel is located is higher than the side where the sample gas outlet channel is located.
The sample gas circulation chamber is wrapped by a heat insulation material, and an electric heating wire is arranged in the heat insulation material.
The high-temperature compressed air inlet and the cyclone blowing holes are formed in the first mounting base, the high-temperature compressed air chamber is arranged between the outer shell and the inner shell of the first mounting base, one end of the high-temperature compressed air chamber is communicated with the high-temperature compressed air inlet, the other end of the high-temperature compressed air chamber is connected with the cyclone blowing holes, the cyclone blowing holes are multiple and evenly arranged along the circumferential direction of the front end of the first mounting base, and the cyclone blowing holes are evenly and obliquely downwards arranged and exit the high-temperature transmission lens of the directional double-transmission lens.
The temperature resistant range of the high-temperature transmission lens is 280-420 ℃, and the temperature resistant range of the low-temperature transmission lens is 20-85 ℃.
The heat insulation material is aluminum silicate heat insulation material, and the thickness is 10-15 cm.
The utility model has the advantages that:
the utility model provides a be applied to flue gas circulation device that laser method ammonia escape detected, through cooling structure and the cooperation of two transmission lens, can protect laser ammonia escape analysis appearance not receive on the basis that high temperature damaged, improve the temperature of high temperature transmission lens end, avoid making high temperature transmission lens end surface local temperature reduce to below 220 ℃ because cooling gas cooling, lead to being surveyed the cooling of appearance gas and produce the sulphate crystallization, the transmissivity of lens surface reduction camera lens is attached to, the camera lens blocks completely even, finally make laser source can't pass the camera lens, and make equipment inefficacy.
The sample gas circulation chamber has a certain inclination angle (5-30 degrees), so that dust in the flue gas can fall into the sample gas circulation chamber under the action of gravity, and then is taken away to the downstream by the sample gas along the wall of the inclined circulation chamber, and finally is discharged back to the flue, thereby ensuring that the sample gas circulation chamber is not blocked.
The sample gas circulation chamber is externally wrapped with a heat insulation material in the whole process and is heated by an electric heating wire, so that the high temperature of all the positions of the circulation chamber is maintained to prevent ammonium salt formed by components in the flue gas from crystallizing to the circulation chamber and the transmission lens to be attached, and the blockage in the circulation chamber and the reduction of the light transmittance of the lens are caused.
The utility model discloses a set up whirl purge hole in the one end of high temperature transmission lens contact appearance gas, adopt multichannel high temperature compressed air to flow through whirl purge hole and spray to the mirror surface, multichannel compressed air sprays to form the whirl district together can on the mirror surface, sweeps transmission lens, and the dust on clean camera lens surface continuously sweeps and can guarantee the indoor portion of the relative appearance circulation of air in camera lens place and form local high pressure, prevents the dust to the diffusion of camera lens position.
The following will be described in further detail with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic structural view of one embodiment of a first mounting seat;
FIG. 3 is a schematic view of the installation of a dual transmission lens;
FIG. 4 is a front view of the arrangement of the swirl purge holes;
FIG. 5 is a side view of the arrangement of the swirl flow purge holes.
In the figure: 1. a laser emitting end; 2. a cold air inlet I; 3. mounting a first base; 4. a first flange; 5. a flow meter; 6. a sample gas flow cell; 7. a laser receiving end; 8. a cold air inlet II; 9. mounting a second base; 10. the sample gas enters the channel; 11. a sample gas discharge passage; 12. a second flange; 13. a first cold air outlet; 14. a high temperature compressed air inlet; 15. a high temperature compressed air chamber; 16. a transmissive lens support; 17. a cyclone purge hole; 18. a high temperature transmission lens; 19. a high temperature resistant flexible gasket; 20. a low temperature transmission lens.
Detailed Description
The following description is provided for illustrative embodiments of the present invention, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein.
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, which, however, may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments presented in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Example 1:
the embodiment provides a flue gas circulation device applied to ammonia escape detection by a laser method, which comprises a sample gas circulation chamber 6, wherein two ends of the sample gas circulation chamber 6 are respectively provided with a connecting mechanism, the two connecting mechanisms are respectively connected with a first mounting base 3 and a second mounting base 9, the first mounting base 3 is connected with a laser emitting end 1, the second mounting base 9 is connected with a laser receiving end 7, the laser emitting end 1 and the laser receiving end 7 are positioned on the same horizontal line, double transmission lenses are respectively arranged in the first mounting base 3 and the second mounting base 9 and inserted into the sample gas circulation chamber 6;
sample gas inlet channel 10 and sample gas exhaust passage 11 are communicate respectively to the upside and the downside of sample gas circulation room 6, sample gas inlet channel 10 is close to installation base 3, sample gas exhaust passage 11 is close to installation base two 9, the flowmeter 5 is equipped with on the sample gas inlet channel 10, laser emission end 1 has seted up air conditioning import 1, installation base 3 has been close to 1 one end of laser emission end and has seted up air conditioning export 13.
The use process comprises the following steps:
the flue gas circulation device of this embodiment is communicated with the bypass of flue, adopt multipoint network method flue gas extraction device, with the flue gas extraction of flue in some sample gas, after adopting the mode misce bene of bypass circulation, as shown in figure 1, sample gas gets into sample gas circulation room 6 by sample gas inlet passage 10, later discharges to the flue through sample gas discharge passage 11, at this in-process, through laser emission end 1 transmission laser, laser receiving terminal 7 receives laser, laser passes sample gas and carries out the detection that NOx and ammonia escape. Wherein, cool off laser emission end 1 through a cold air import 1 and a cold air export 13, on the same way, cool off through two 8 and two pairs of laser receiving ends 7 of cold air import and cold air export, avoid the instrument to receive high temperature destruction.
Example 2:
on the basis of embodiment 1, this embodiment provides a flue gas circulation device for laser method ammonia escape detection, two transmission lenses include high temperature transmission lens 18 and low temperature transmission lens 20, be the air between high temperature transmission lens 18 and the low temperature transmission lens 20, low temperature transmission lens 20 is close to cold air export 13.
As shown in fig. 3, the dual transmission lens includes a high temperature transmission lens 18 and a low temperature transmission lens 20. One end of the high-temperature transmission lens 18 is contacted with high-temperature sample gas, one end of the low-temperature transmission lens 20 is opposite to the laser emission end 1 and can be cooled by cold gas, an air heat insulation layer is arranged in the middle, when the low-temperature transmission lens 20 is contacted with cold gas with the temperature of less than 85 ℃ and continuously swept, the high-temperature transmission lens 18 can be heated to the temperature of more than 220 ℃ by the sample gas with the temperature of 320-380 ℃, and sulfate crystallization of the sample gas in the high-temperature transmission lens 18 is prevented.
As shown in fig. 1 and 2, cold air enters from a cold air inlet 1 to cool the laser ammonia escape analyzer, and since a cold air outlet 13 is close to the low temperature transmission lens 20 and an air thermal insulation layer is arranged between the high temperature transmission lens 18 and the low temperature transmission lens 20, the high temperature transmission lens 18 is not lowered below 220 ℃. The second cooling structure and the second cooling structure have the same structure and function.
The high-temperature transmission lens 18 and the low-temperature transmission lens 20 are respectively installed on the first installation base 3 and the second installation base 9 through the transmission lens support body 16, and high-temperature resistant flexible gaskets 19 are respectively clamped between the transmission lens support body 16 and the high-temperature transmission lens 18 and between the transmission lens support body 16 and the low-temperature transmission lens 20, so that the lens glass body is prevented from cracking under stress when the lenses are subjected to cold-heat exchange change. The high temperature transmission lens 18 and the low temperature transmission lens 20 can be detached, so that the lenses can be cleaned, maintained and replaced conveniently.
Example 3:
on the basis of embodiment 1, the present embodiment provides a flue gas circulation device for ammonia escape detection by laser method, the sample gas circulation chamber 6 forms an included angle of 5 ° to 30 ° with the horizontal direction, and the side of the sample gas inlet channel 10 is higher than the side of the sample gas outlet channel 11.
The sample gas circulation chamber 6 forms an inclination angle of 5-30 degrees with the horizontal line, so that dust in the flue gas can be taken away to the downstream by the sample gas along the inclined circulation chamber wall under the action of gravity, and is finally discharged back to the flue, the gas sample circulation chamber is ensured not to be blocked, and the self-cleaning function is realized.
Example 4:
on the basis of embodiment 1, this embodiment provides a flue gas circulation device for laser method ammonia escape detection, the outer parcel of appearance gas flow chamber 6 has insulation material, be equipped with electric heating wire in the insulation material.
The sample gas flow chamber 6 is wrapped with a heat insulation material and heated by an electric heating wire in the whole process, and the high temperature of the whole position of the flow chamber is maintained to prevent the components in the smoke from forming ammonium salt crystals to the flow chamber and the transmission lens to be adhered, so that the blockage in the flow chamber and the reduction of the light transmittance of the lens are caused.
Example 5:
on the basis of any one of embodiments 1-4, the embodiment provides a flue gas circulation device applied to laser method ammonia escape detection, a high-temperature compressed air inlet 14 and a cyclone purge hole 17 are formed in a first mounting base 3, a high-temperature compressed air chamber 15 is arranged between an outer shell and an inner shell of the first mounting base 3, one end of the high-temperature compressed air chamber 15 is communicated with the high-temperature compressed air inlet 14, the other end of the high-temperature compressed air chamber is connected with the cyclone purge hole 17, the cyclone purge holes 17 are multiple and evenly arranged along the circumferential direction of the front end of the first mounting base 3, the cyclone purge holes 17 are all obliquely arranged downwards, and an outlet of the high-temperature transmission lens 18 points to a double transmission lens.
In the embodiment, a cyclone purge hole 17 is adopted for dry dust possibly adhered to the high temperature transmission lens 18, and the cyclone purge hole 17 (as shown in fig. 4) is designed on the surface of the high temperature transmission lens 18 contacting the sample gas. 4-8 paths of high-temperature (350 +/-15 ℃) compressed air flow is sprayed to the mirror surface through the cyclone cleaning holes 17, and the spraying direction of each cyclone cleaning hole 17 points to the circle center of the mirror surface but has a deviation, as shown in fig. 5. When multiple paths of high-temperature compressed air are sprayed together, a cyclone area is formed on the surface of the high-temperature transmission lens 18 to purge the transmission lens. And cleaning dust on the surface of the lens. Continuous purging can ensure that the area where the lens is located forms local high pressure relative to the inside of the circulation chamber, and dust is prevented from diffusing to the position of the lens.
As shown in fig. 4 and 5, the rotational flow purge holes 17 are used to control the flow rate of the purge gas flow, when the purge gas pressure of the rotational flow purge holes 17 is much higher than the pressure of the sample gas flow chamber 6, the thermal compression gas flow rate passing through the rotational flow purge holes 17 is constant, and the rotational flow purge gas amount can be calculated according to the area of the rotational flow purge holes 17, the number of the rotational flow purge holes 17 and the constant flow rate. Respectively measuring the amount of the sample gas and the air flow swept by the rotational flow, and converting the ammonia escape concentration of the sample gas diluted by the compressed air introduced into the sample gas into the ammonia escape concentration of the pure sample gas through the flow proportion.
Example 6:
on the basis of embodiment 2, this embodiment provides a flue gas circulation device for laser method ammonia escape detection, and the temperature resistant range of the high temperature transmission lens 18 is 280 ℃ -420 ℃, and the temperature resistant range of the low temperature transmission lens 20 is 20 ℃ -85 ℃.
The transmission lens of the laser ammonia escape analyzer is a double-transmission lens, the gas contact end of the double-transmission lens is a high-temperature lens (280-420 ℃), the other end of the double-transmission lens is a low-temperature lens (20-85 ℃), the double-transmission lens is arranged on a transmission lens support body 16 in a pre-installed mode, air is arranged between the two transmission lenses to play a role in air sealing and heat insulation, the surface of the low-temperature transmission lens 20 is blown and cooled by cold compressed air, and a flexible gasket is clamped between the transmission lens support body 16 and the lenses (including the high-temperature transmission lens 18 and the low-temperature transmission lens 20) to ensure that a lens glass body is not cracked under stress when the lenses are subjected to cold heat exchange change.
Example 7:
on the basis of embodiment 4, this embodiment provides a flue gas circulation device for laser method ammonia escape detection, and the heat preservation material is aluminum silicate heat preservation material, and the thickness is 10-15 cm.
In this embodiment, the sample gas flow chamber 6 is maintained at a high temperature by the heat insulating material to prevent the components in the flue gas from forming ammonium salt crystals and adhering to the sample gas flow chamber 6 and the high temperature transmission lens 18, which may cause blockage in the sample gas flow chamber 6 and decrease in transmittance of the high temperature transmission lens 18.
Example 8:
the embodiment provides a be applied to flue gas circulation device that laser method ammonia escape detected, as shown in fig. 1, including sample gas circulation room 6, the upside and the downside of sample gas circulation room 6 communicate sample gas inlet channel 10 and sample gas exhaust passage 11 respectively, the both ends of sample gas circulation room 6 all are equipped with coupling mechanism, coupling mechanism one end sets firmly or integrative the setting with sample gas circulation room 6, mounting base 3 is connected to coupling mechanism's the other end, two transmission lenses are installed through transmission lens supporter 16 to mounting base 3's front end (for the right-hand member in fig. 1), inserting sample gas circulation room 6 behind the coupling mechanism is passed to mounting base 3's front end.
In this embodiment, the connecting mechanism at the left end of the sample gas flow chamber 6 is a flange one 4, and the middle part of the mounting base one 3 is provided with a flange which is matched and connected with the flange one 4. The end (the left end in the figure 1) of the first mounting base 3 is provided with a second flange 12, and is connected with the flange of the laser emitting end 1 through the second flange 12. The connection mode of the right end of the sample gas flow chamber 6, the second mounting seat and the laser receiving end 7 is the same as the process. When the double-transmission lens needs to be replaced, the first flange 4 and the second flange 12 are opened, and the first mounting base 3 is pulled out from the sample gas flow chamber 6, so that the replacement is convenient. The sample gas flow chamber 6 is wrapped with a heat insulation material, and an electric heating wire is arranged in the heat insulation material.
The second mounting base and the first mounting base 3 are identical in structure. Taking the first installation base 3 as an example, a high-temperature compressed air inlet 14 and a cyclone purge hole 17 are formed in the first installation base 3, a high-temperature compressed air chamber 15 is arranged between an outer shell and an inner shell of the first installation base 3, one end of the high-temperature compressed air chamber 15 is communicated with the high-temperature compressed air inlet 14, the other end of the high-temperature compressed air chamber is connected with the cyclone purge hole 17, the cyclone purge holes 17 are multiple and are evenly arranged along the circumferential direction of the front end of the first installation base 3, and the cyclone purge holes 17 are all obliquely arranged downwards and are used for outputting the high-temperature transmission lens 18 pointing to the double transmission lenses.
The dry dust possibly adhered to the high-temperature transmission lens 18 is solved by adopting a cyclone purge hole 17, and the cyclone purge hole 17 (as shown in fig. 4) is designed on the surface of the high-temperature transmission lens 18 contacting the sample gas. 4-8 paths of high-temperature (350 +/-15 ℃) compressed air flow is sprayed to the mirror surface through the cyclone cleaning holes 17, and the spraying direction of each cyclone cleaning hole 17 points to the circle center of the mirror surface but has a deviation, as shown in fig. 5. When multiple paths of high-temperature compressed air are sprayed together, a cyclone area is formed on the surface of the high-temperature transmission lens 18 to purge the transmission lens. And cleaning dust on the surface of the lens. Continuous purging can ensure that the area where the lens is located forms local high pressure relative to the inside of the circulation chamber, and dust is prevented from diffusing to the position of the lens.
The laser emitting end 1 is provided with a cold air inlet I1, a cold air outlet I13 is arranged on the mounting base I3 and on the left side of a high-temperature compressed air inlet 14; the laser receiving end 7 is provided with a second cold air inlet 8, the second cold air outlet is formed in the second mounting seat, and the right side of the high-temperature compressed air inlet 14 is formed.
The double-transmission lens comprises a high-temperature transmission lens 18 and a low-temperature transmission lens 20, air is filled between the high-temperature transmission lens 18 and the low-temperature transmission lens 20, and the low-temperature transmission lens 20 is close to the first cold air outlet 13 or the second cold air outlet. One end of the temperature transmission lens is contacted with high-temperature sample gas, one end of the low-temperature transmission lens 20, which is opposite to the laser emission end 1, can be cooled by cold gas, and the middle part of the low-temperature transmission lens is provided with an air heat insulation layer, so that when the low-temperature transmission lens 20 is contacted with cold gas with the temperature of less than 85 ℃ to continuously blow, the high-temperature transmission lens 18 can be heated to the temperature of more than 220 ℃ by the sample gas with the temperature of 320-380 ℃, and the sample gas is prevented from generating sulfate crystals on the high-temperature transmission lens 18.
The above illustration is merely an illustration of the present invention, and does not limit the scope of the present invention, and all designs identical or similar to the present invention are within the scope of the present invention.
Claims (7)
1. The utility model provides a be applied to flue gas circulation device that laser method ammonia escape detected which characterized in that: the sample gas circulation chamber is provided with connecting mechanisms at two ends, the two connecting mechanisms are respectively connected with a first mounting base and a second mounting base, the first mounting base is connected with a laser emitting end, the second mounting base is connected with a laser receiving end, the laser emitting end and the laser receiving end are positioned on the same horizontal line, double transmission lenses are respectively mounted in the first mounting base and the second mounting base, and the double transmission lenses are inserted into the sample gas circulation chamber;
the upside and the downside of appearance circulation of gas room communicate appearance gas access passage and appearance gas exhaust passage respectively, appearance gas access passage is close to installation base one, appearance gas exhaust passage is close to installation base two, the flowmeter is equipped with on the appearance gas access passage, air conditioning import one has been seted up to laser emission end, installation base one is close to laser emission end one end and has been seted up air conditioning export one.
2. The smoke circulating device applied to the ammonia escape detection by the laser method according to claim 1, characterized in that: the double-transmission lens comprises a high-temperature transmission lens and a low-temperature transmission lens, air is arranged between the high-temperature transmission lens and the low-temperature transmission lens, and the low-temperature transmission lens is close to the first cold air outlet.
3. The smoke circulating device applied to the ammonia escape detection by the laser method according to claim 1, characterized in that: the sample gas circulation chamber forms an included angle of 5-30 degrees with the horizontal direction, and the side where the sample gas inlet channel is located is higher than the side where the sample gas outlet channel is located.
4. The smoke circulating device applied to the ammonia escape detection by the laser method according to claim 1, characterized in that: the sample gas circulation chamber is wrapped by a heat insulation material, and an electric heating wire is arranged in the heat insulation material.
5. The flue gas circulation device applied to the ammonia escape detection by the laser method according to any one of claims 1 to 4, wherein: the high-temperature compressed air inlet and the cyclone blowing holes are formed in the first mounting base, the high-temperature compressed air chamber is arranged between the outer shell and the inner shell of the first mounting base, one end of the high-temperature compressed air chamber is communicated with the high-temperature compressed air inlet, the other end of the high-temperature compressed air chamber is connected with the cyclone blowing holes, the cyclone blowing holes are multiple and evenly arranged along the circumferential direction of the front end of the first mounting base, and the cyclone blowing holes are evenly and obliquely downwards arranged and exit the high-temperature transmission lens of the directional double-transmission lens.
6. The smoke circulating device applied to the ammonia escape detection by the laser method according to claim 2, is characterized in that: the temperature resistant range of the high-temperature transmission lens is 280-420 ℃, and the temperature resistant range of the low-temperature transmission lens is 20-85 ℃.
7. The smoke circulating device applied to the ammonia escape detection by the laser method according to claim 4, wherein: the heat insulation material is aluminum silicate heat insulation material, and the thickness is 10-15 cm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114354297A (en) * | 2022-03-21 | 2022-04-15 | 朗思传感科技(深圳)有限公司 | Filter screen probe |
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2021
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114354297A (en) * | 2022-03-21 | 2022-04-15 | 朗思传感科技(深圳)有限公司 | Filter screen probe |
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