CN107570497B - Undisturbed back flushing device - Google Patents
Undisturbed back flushing device Download PDFInfo
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- CN107570497B CN107570497B CN201710932041.8A CN201710932041A CN107570497B CN 107570497 B CN107570497 B CN 107570497B CN 201710932041 A CN201710932041 A CN 201710932041A CN 107570497 B CN107570497 B CN 107570497B
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Abstract
An undisturbed back-blowing device belongs to the technical field of gas component monitoring, and particularly relates to an undisturbed back-blowing device. The invention provides an undisturbed back-blowing device capable of ensuring the continuity of measurement of an instrument. The invention comprises an air cavity, and is structurally characterized in that a mixing chamber exhaust check valve is arranged in the middle of the upper end of the air cavity, a probe blowing check nozzle which blows air to the upper middle part is arranged at the upper end of the air cavity around the mixing chamber exhaust check valve, an air suction pump is arranged at the middle outlet of the lower end of the air cavity, a pneumatic film is arranged on the inner wall of the lower end of the air cavity around the middle outlet of the lower end of the air cavity, the periphery of the pneumatic film is connected with the wall of the air cavity, a compressed air cavity is arranged between the pneumatic film and the inner wall of the lower end of the air cavity, a sample air cavity is arranged between the pneumatic film and the inner wall of the upper end of the air cavity, and the compressed air cavity is connected with compressed air inlet and outlet equipment.
Description
Technical Field
The invention belongs to the technical field of gas component monitoring, and particularly relates to an undisturbed back blowing device.
Background
With the development of economic technology and social progress, people have higher and higher requirements on environmental quality, particularly air quality, and meanwhile, a large amount of harmful gas is generated in the production process of producing materials such as energy, steel and the like, which contradict with each other. This requires us to find a balance point between environmental quality and material demand, and the measurement of harmful gases becomes an important part of the balance. In addition, other gas components measured in production life, such as oxygen, carbon monoxide, ammonia, etc., are also equivalent to the gas contaminant measurement.
The existing sampling device of the gas monitoring system mostly cannot find a representative sampling point due to factors such as large sectional area of a gas pipeline, short straight section of the pipeline, single-point sampling and the like, so that the gas content of the measured sample gas and the whole gas content generate large deviation. In addition, a sampling branch pipeline and a probe filter core are frequently blocked due to the fact that the detected gas contains a large amount of solid impurities, the existing back-blowing blockage method is compressed air back-blowing or physical dredging mostly, the back-blowing process cannot be used for gas continuous monitoring, and parameter monitoring and industrial adjustment are affected.
Disclosure of Invention
The invention aims at the problems and provides an undisturbed back-blowing device capable of ensuring the continuity of the measurement of an instrument.
The invention adopts the following technical scheme that the air cavity comprises an air cavity, and is structurally characterized in that a mixing chamber exhaust check valve is arranged in the middle of the upper end of the air cavity, a probe blowing check nozzle blowing air to the upper middle part is arranged at the upper end of the air cavity around the mixing chamber exhaust check valve, an air suction pump is arranged at a middle outlet of the lower end of the air cavity, a pneumatic film is arranged on the inner wall of the lower end of the air cavity around the middle outlet of the lower end of the air cavity, the periphery of the pneumatic film is connected with the wall of the air cavity, a compressed air cavity is arranged between the pneumatic film and the inner wall of the lower end of the air cavity, a sample air cavity is arranged between the pneumatic film and the inner wall of the upper end of the air cavity, and the compressed air cavity is connected with compressed air inlet and outlet equipment.
The upper end of the middle part of the pneumatic film is connected with the spring tray, the middle opening of the spring tray is communicated with the outlet of the middle part of the lower end of the air cavity, and an air suction spring is arranged between the spring tray and the inner wall of the upper end of the air cavity.
As a preferred scheme, the lower end of a hollow exhaust shaft sequentially penetrates through a middle opening of a spring tray, a middle outlet of the lower end of an air cavity is connected with an inlet of an air pump, the upper end of the hollow exhaust shaft is exposed out of the middle opening of the spring tray and is provided with an upper sealing pressure plate, the lower end face of the upper sealing pressure plate is extruded with the upper end face of the middle of the spring tray, a lower sealing pressure plate is arranged on the outer side of the hollow exhaust shaft in a compressed air cavity, and the upper end face of the lower sealing pressure plate is extruded with the lower end face of the middle of a pneumatic film; the lower sealing pressure plate is tightly connected with the upper sealing pressure plate, so that the upper end of the hollow exhaust shaft, the spring tray and the middle part of the pneumatic film are connected together.
As another preferred scheme, the lower end of the hollow exhaust shaft is connected with an inlet of the air suction pump through an exhaust telescopic pipe.
As another preferred scheme, the hollow exhaust shaft is connected with the middle outlet at the lower end of the air cavity through the sealing ring.
As another preferred scheme, the number of the suction springs is four, and the suction springs are uniformly distributed around the opening in the middle of the spring tray.
As another preferred scheme, the compressed air intake and exhaust equipment comprises an intake and exhaust pipe communicated with a compressed air cavity, the outer end of the intake and exhaust pipe is connected with a first end of a purging three-way valve, a second end of the purging three-way valve is respectively connected with a compressed air source and a compressed air storage tank, and a third end of the purging three-way valve is an exhaust port; and a control signal input port of the purging three-way valve is connected with a control signal output port of the controller.
As another preferred scheme, a sample gas cavity exhaust valve is arranged on the hollow exhaust shaft, and a control signal input port of the sample gas cavity exhaust valve is connected with a control signal output port of the controller.
As another preferred scheme, the hollow exhaust shaft is provided with a limit feedback plate, an upper purging limit switch and a lower sampling limit switch are arranged corresponding to the limit feedback plate, and a detection signal output port of the upper purging limit switch and a detection signal output port of the lower sampling limit switch are respectively connected with a detection signal input port of the controller.
As another preferred scheme, the upper end of the probe purging check nozzle is connected with a check valve which can be turned upwards and outwards through a shaft.
As another preferred scheme, the air cavity comprises an upper air cavity shell and a lower air cavity shell which are connected in a buckling mode, the buckling positions of the upper air cavity shell and the lower air cavity shell are connected through an upper flange and a lower flange, and the periphery of the pneumatic film is clamped between the upper flange and the lower flange.
As another preferred scheme, the invention also comprises a multipoint rotational flow type gas sampling device, wherein the multipoint rotational flow type gas sampling device comprises a rotational flow mixing chamber and a plurality of sampling branch pipes, and sampling points of the sampling branch pipes are uniformly arranged in the radial direction of the flue; the sampling branch pipes are communicated with the rotational flow mixing chamber, and the outlet directions of the sampling branch pipes are uniformly arranged in the rotational flow mixing chamber in the same clockwise direction; an analysis instrument probe or a sampling probe mounting interface is arranged above the cyclone mixing chamber; the cyclone mixing chamber is arranged in the middle of the upper end of the air cavity, and the lower end of the cyclone mixing chamber is communicated with the air cavity through the mixing chamber exhaust check valve and the probe blowing check nozzle.
As another preferred scheme, sampling points of each sampling branch pipe are uniformly distributed in the radial direction of the pipeline, so that the sampling requirement of a multipoint grid method is met; before the sampling device is put into operation, the flow of the sample gas entering each sampling branch pipe is adjusted to ensure that the flow of the sample gas of each sampling branch pipe is the same; the sampling branch pipes are communicated with the rotational flow mixing chamber and are uniformly arranged in the rotational flow mixing chamber in the same clockwise direction, so that gas forms rotational flow after entering the mixing chamber to be fully mixed; the air pump enables the flue gas to flow in the air cavity and drives the flue gas in the rotational flow mixing chamber and each sampling branch pipe to flow.
As another preferred scheme, the number of the sampling branch pipes is four.
As another preferred scheme, the cyclone mixing chamber is cylindrical.
As another preferred scheme, the sampling branch pipe comprises an upper branch pipe and a sampling probe extending into the flue, the lower end of the sampling probe is of an offset structure, the upper part of the sampling probe is connected with the flue wall through a direction-adjusting joint, and the upper end of the sampling probe is connected with the lower end of the upper branch pipe through a detachable connector.
As another preferred scheme, the direction-adjusting joint comprises a connecting body, the lower end of the connecting body is welded with the flue wall, a sampling probe penetrates through a through hole in the middle of the connecting body, an external thread is arranged on the outer wall of the upper end of the connecting body, the inner wall of the upper end of the connecting body is of a bevel opening structure, the lower end of a truncated cone-shaped clamping sleeve is clamped in the bevel opening and sleeved outside the sampling probe, a nut matched with the external thread is screwed on the upper end of the connecting body, and the inner wall of the upper end of the nut is extruded with the upper end face of the clamping sleeve.
As another preferred scheme, the detachable connector comprises a hollow connector body, the upper end of a sampling probe is inserted into the lower part of the connector body, the lower end of an upper branch pipe is inserted into the upper part of the connector body, the outer walls of the upper end and the lower end of the connector body are provided with external threads and nuts matched with the external threads, the outer walls of the upper end and the lower end of the connector body are of bevel opening structures, the lower end of a truncated cone-shaped cutting sleeve is clamped in the bevel opening, the cutting sleeve at the upper end of the connector body is sleeved outside the upper branch pipe, and the cutting sleeve at the lower end of the connector body is sleeved outside the sampling probe; the inner wall of the upper end of the nut at the upper end of the joint body is extruded with the upper end surface of the clamping sleeve at the upper end of the joint body, and the inner wall of the lower end of the nut at the lower end of the joint body is extruded with the lower end surface of the clamping sleeve at the lower end of the joint body.
As another preferred scheme, the invention adjusts the orientation of the eccentric port in the flue gas flow, so that the sample gas flow entering each sampling branch pipe is the same.
As another preferred scheme, the sampling branch pipe is an inverted L-shaped pipe; the horizontal pipe at the upper end of the sampling branch pipe is welded with the side wall of the rotational flow mixing chamber or connected with the hoop connector.
As another preferable scheme, the analysis meter provided by the invention adopts an analysis meter with a self-suction function, and the outlet of the sampling branch pipe is arranged below the probe of the analysis meter.
As another preferable mode, the analyzer with self-priming function of the present invention is a cedronol SCS-900C analyzer.
As another preferred scheme, the analytical instrument provided by the invention adopts an analytical instrument without a self-absorption function, and the outlet of the sampling branch pipe is arranged at the middle upper part of the probe of the analytical instrument.
As another preferred embodiment, the analyzer without self-priming function according to the present invention is an AMETEK 210 type oxygen content analyzer.
As another preferable scheme, the invention further comprises a temperature sensor for detecting the sampling branch pipe and a temperature sensor for detecting the temperature in the flue, wherein a detection signal input port of the controller is respectively connected with a detection signal output port of the temperature sensor for detecting the sampling branch pipe and a detection signal output port of the temperature sensor for detecting the temperature in the flue.
As another preferred scheme, the temperature sensor for detecting the sampling branch pipe is arranged on the outer wall of the sampling branch pipe two meters above the joint of the sampling branch pipe and the flue.
As another preferred scheme, the outer wall of the sampling branch pipe between the rotational flow mixing chamber and the flue is subjected to heat preservation treatment except the position where the temperature sensor of the sampling branch pipe is arranged.
As another preferable scheme, the controller detects the temperature of each sampling branch pipe, and if the deviation between the temperature of a certain sampling branch pipe and the temperature of other sampling branch pipes or the temperature of the flue exceeds a set value, the controller sends out a blockage signal of the sampling branch pipe.
As another preferred scheme, the volume of the sample air cavity is larger than the sum of the volume of the rotational flow mixing chamber and the volume of each sampling branch pipeline.
Secondly, a horizontal pipe at the upper end of the sampling branch pipe is provided with a sampling branch pipe electromagnetic valve, and a control signal input port of the sampling branch pipe electromagnetic valve is connected with a control signal output port of the controller.
In addition, the sampling branch pipes of the invention extend into the flue at different depths.
The invention has the beneficial effects.
When the invention is started by back flushing, the volume of the air cavity shrinks to extrude sample gas to enter the rotational flow mixing chamber to purge the instrument probe filter element and each sampling branch pipe. When the back flushing is finished, the volume of the air cavity expands to generate negative pressure, and the negative pressure is sucked into the air cavity through each sampling branch pipe and the rotational flow mixing chamber.
When the device is used, the air suction pump is connected with the flue, and air suction of the air suction pump enables smoke to flow in the undisturbed reverse blowing device and flow through the exhaust check valve, the rotational flow mixing chamber and the sampling branch pipe. The outlet of the air pump can be arranged on the outer wall of the flue through a flange, and the flue gas is discharged back into the flue. The purging gas is the sample gas, and the new sample gas can be quickly sucked back after the sample gas is blown into the rotational flow mixing chamber and the sampling branch pipeline, so that the continuity of the measurement of the instrument can be ensured.
The invention uses the compression and expansion of the air cavity to discharge and suck back the sample gas to purge the probe and the pipeline, thereby achieving the continuous undisturbed measurement in the purging process.
The spring tray can disperse the local pressure of the suction spring on the pneumatic film.
Drawings
The invention is further described with reference to the following figures and detailed description. The scope of the invention is not limited to the following expressions.
FIG. 1 is a schematic diagram of the present invention.
FIG. 2 is a top view of the cyclonic mixing chamber of the present invention.
FIG. 3 is a schematic view of the probe purge check nozzle structure of the present invention.
FIG. 4 is a schematic view of a direction-adjusting joint structure according to the present invention.
Fig. 5 is a schematic structural view of the detachable connecting body of the present invention.
In the figure, 1, a sampling branch electromagnetic valve; 2. an outlet of the sampling branch pipe; 3. a measuring instrument probe filter; 4. a swirling flow mixing chamber; 5. sampling branch pipes; 6. a compressed air storage tank; 7. purging the three-way valve to exhaust; 8. blowing a non-return nozzle by a probe; 9. a sample gas cavity; 10. an upper and lower air cavity housing; 11. an air suction spring; 12. an exhaust check valve; 13. sampling the temperature of the branch pipe; 14. an upper sealing pressure plate; 15. a pneumatic membrane; 16. the upper and lower cavity walls are connected with the pneumatic film through the flange bolts; 17. purging the three-way valve; 18. an air inlet and outlet pipe; 19. a hollow exhaust shaft; 20. a spring tray; 21. a compressed air chamber; 22. a source of compressed air; 23. a seal ring; 24. a sample gas cavity exhaust valve; 25. a controller; 26. an exhaust extension tube; 27. a detachable connector; 28. a direction-adjusting joint; 29. an air pump; 30. a flue; 31. an exhaust pipe; 32. flue temperature; 33. an offset structure; 34. an upper purge limit switch; 35. a down-sampling limit switch; 36. a limit feedback plate; 37. the probe sweeps the closing state of the non-return nozzle; 38. the probe purges the open state of the non-return nozzle; 39. a nut; 40. a sampling probe; 41. a card sleeve; 42. a linker; 43. an upper branch pipe; 44. a fitting body.
Detailed Description
As shown in the figure, the device comprises an air cavity, a mixing chamber exhaust check valve 12 is arranged in the middle of the upper end of the air cavity, a probe blowing check nozzle 8 which blows air to the upper middle part is arranged at the upper end of the air cavity around the mixing chamber exhaust check valve 12, an air suction pump 29 is arranged at an outlet in the middle of the lower end of the air cavity, a pneumatic film 15 is arranged on the inner wall of the lower end of the air cavity around the outlet in the middle of the lower end of the air cavity, the periphery of the pneumatic film 15 is connected with the wall of the air cavity, a compressed air cavity 21 is arranged between the pneumatic film 15 and the inner wall of the lower end of the air cavity, a sample air cavity 9 is arranged between the pneumatic film 15 and the inner wall of the upper end of the air cavity, and the compressed air cavity 21 is connected with compressed air inlet and outlet equipment.
The upper end of the middle part of the pneumatic film 15 is connected with a spring tray 20, the middle opening of the spring tray 20 is communicated with the middle outlet of the lower end of the air cavity, and a suction spring 11 is arranged between the spring tray 20 and the inner wall of the upper end of the air cavity.
The lower end of a hollow exhaust shaft sequentially penetrates through a middle opening of a spring tray 20, a middle outlet of the lower end of an air cavity is connected with an inlet of an air suction pump 29, the upper end of the hollow exhaust shaft 19 is exposed out of the middle opening of the spring tray 20 and is provided with an upper sealing pressure plate 14, the lower end face of the upper sealing pressure plate 14 is extruded with the upper end face of the middle of the spring tray 20, a lower sealing pressure plate is arranged on the outer side of the hollow exhaust shaft 19 in a compressed air cavity 21, and the upper end face of the lower sealing pressure plate is extruded with the lower end face of the middle of a pneumatic film 15; the lower sealing pressure plate is tightly connected with the upper sealing pressure plate 14, so that the upper end of the hollow exhaust shaft 19, the spring tray 20 and the middle part of the pneumatic membrane 15 are connected together. The hollow exhaust shaft 19, the spring tray 20 and the pneumatic membrane 15 can be reliably connected through the sealing pressure plate.
The lower end of the hollow exhaust shaft 19 is connected with the inlet of an air suction pump 29 through an exhaust telescopic pipe 26; facilitating the up and down movement of the hollow exhaust shaft 19.
The hollow exhaust shaft 19 is connected with an outlet in the middle of the lower end of the air cavity through a sealing ring 23; the sealing performance is reliably improved.
The four suction springs 11 are uniformly distributed around the opening in the middle of the spring tray 20; the spring tray 20 is stressed evenly and works stably.
The compressed air intake and exhaust equipment comprises an intake and exhaust pipe 18 communicated with a compressed air cavity 21, the outer end of the intake and exhaust pipe 18 is connected with a first end of a purging three-way valve 17, a second end of the purging three-way valve 17 is respectively connected with a compressed air source 22 and a compressed air storage tank 6, and a third end of the purging three-way valve 17 is an exhaust port; and a control signal input port of the purging three-way valve 17 is connected with a control signal output port of the controller. The provision of the purge three-way valve 17 facilitates control of the intake and exhaust of the compressed air chamber 21.
And a sample gas cavity exhaust valve 24 is arranged on the hollow exhaust shaft 19, and a control signal input port of the sample gas cavity exhaust valve 24 is connected with a control signal output port of the controller. The provision of the sample gas chamber vent valve 24 facilitates the venting control of the sample gas chamber 9.
The hollow exhaust shaft 19 is provided with a limit feedback plate 36, an upper purging limit switch 34 and a lower sampling limit switch 35 are arranged corresponding to the limit feedback plate 36, and a detection signal output port of the upper purging limit switch 34 and a detection signal output port of the lower sampling limit switch 35 are respectively connected with a detection signal input port of the controller. A limit feedback plate 36, an upper purging limit switch 34 and a lower sampling limit switch 35 are arranged, so that the moving position of the hollow exhaust shaft 19 can be controlled conveniently.
The upper end of the probe purging check nozzle 8 is connected with a check valve which can be turned upwards and outwards through a shaft; simple structure and reliable non-return function.
The air cavity comprises an upper air cavity shell and a lower air cavity shell which are connected in a buckling manner, the buckling positions of the upper air cavity shell and the lower air cavity shell are connected through an upper flange and a lower flange, and the periphery of the pneumatic film 15 is clamped between the upper flange and the lower flange; facilitating a reliable connection of the pneumatic membrane 15.
The multi-point cyclone gas sampling device comprises a cyclone mixing chamber and a plurality of sampling branch pipes 5, wherein sampling points of the sampling branch pipes 5 are uniformly distributed in the radial direction of a flue 30; the sampling branch pipes 5 are communicated with the rotational flow mixing chamber, and the outlets 2 of the sampling branch pipes are uniformly arranged in the rotational flow mixing chamber in the same clockwise direction; an analysis instrument probe or a sampling probe mounting interface is arranged above the cyclone mixing chamber; the cyclone mixing chamber is arranged in the middle of the upper end of the air cavity, and the lower end of the cyclone mixing chamber is communicated with the air cavity through the mixing chamber exhaust check valve 12 and the probe purging check nozzle 8. The sample gas is extracted in the same amount at multiple points to form rotational flow in the rotational flow mixing chamber, so that the sample gas is uniformly mixed.
Sampling points of each sampling branch pipe 5 are uniformly distributed in the radial direction of the pipeline, so that the sampling requirement of a multipoint grid method is met; before the sampling device is put into operation, the flow of the sample gas entering each sampling branch pipe 5 is adjusted to ensure that the flow of the sample gas of each sampling branch pipe 5 is the same; the sampling branch pipes 5 are communicated with the rotational flow mixing chamber 4 and are uniformly arranged in the rotational flow mixing chamber 4 in the same clockwise direction, so that gas forms rotational flow after entering the mixing chamber to be fully mixed; the air pump 29 enables the flue gas to flow in the air cavity and drives the flue gas in the rotational flow mixing chamber 4 and each sampling branch pipe 5 to flow.
The number of the sampling branch pipes 5 is four.
The cyclone mixing chamber 4 is cylindrical.
The sampling branch pipe 5 comprises an upper branch pipe 43 and a sampling probe 40 extending into the flue 30, the lower end of the sampling probe 40 is of an offset structure 33, the upper part of the sampling probe 40 is connected with the wall of the flue 30 through a direction-adjusting joint 28, and the upper end of the sampling probe 40 is connected with the lower end of the upper branch pipe 43 through a detachable connector 27. The direction-adjusting joint 28 is used for connection, so that the offset opening can rotate 360 degrees in the flue 30, and the gas flow entering each sampling branch pipe 5 is enabled to be the same through adjusting the orientation of the offset opening in the gas flow of the flue 30 (the offset opening faces to the gas to be opposite to the gas to ensure that the gas flow entering the sampling branch pipe 5 is large).
The direction-adjusting joint 28 comprises a connecting body 42, the lower end of the connecting body 42 is welded with the wall of the flue 30, the sampling probe 40 penetrates through a through hole in the middle of the connecting body 42, an external thread is arranged on the outer wall of the upper end of the connecting body 42, the inner wall of the upper end of the connecting body 42 is of a bevel opening structure, the lower end of a truncated cone-shaped clamping sleeve 41 is clamped in the bevel opening and sleeved outside the sampling probe 40, a nut 39 matched with the external thread is screwed on the upper end of the connecting body 42, and the inner wall of the upper end of the nut 39 is extruded with the upper end face of the clamping sleeve 41.
The detachable connector 42 comprises a hollow connector body 44, the upper end of the sampling probe 40 is inserted into the lower part of the connector body 44, the lower end of the upper branch pipe 43 is inserted into the upper part of the connector body 44, the outer walls of the upper end and the lower end of the connector body 44 are both provided with external threads and nuts 39 matched with the external threads, the outer walls of the upper end and the lower end of the connector body 44 are of bevel opening structures, the lower end of a truncated cone-shaped cutting sleeve 41 is clamped in the bevel opening, the cutting sleeve 41 at the upper end of the connector body 44 is sleeved outside the upper branch pipe 43, and the cutting sleeve 41 at the lower end of the connector body 44 is sleeved outside the sampling probe 40; the inner wall of the upper end of the nut 39 at the upper end of the connector body 44 is pressed against the upper end face of the ferrule 41 at the upper end of the connector body 44, and the inner wall of the lower end of the nut 39 at the lower end of the connector body 44 is pressed against the lower end face of the ferrule 41 at the lower end of the connector body 44.
The invention makes the sample gas flow entering each sampling branch pipe 5 the same by adjusting the orientation of the eccentric opening in the flue 30 gas flow.
The sampling branch pipe 5 is an inverted L-shaped pipe; the upper end horizontal pipe of the sampling branch pipe 5 is welded with the side wall of the rotational flow mixing chamber 4 or connected with the hoop connector.
The analysis instrument is an analysis instrument with a self-absorption function, and the outlet 2 of the sampling branch pipe is arranged below a probe of the analysis instrument; the service life of the probe of the analytical instrument can be prolonged, and the dust deposition is reduced.
The analysis instrument with the self-absorption function adopts a Sedi-SCS-900C type analysis instrument.
The analysis instrument adopts an analysis instrument without self-absorption function, and the outlet 2 of the sampling branch pipe is arranged at the middle upper part of the probe of the analysis instrument; the contact area between the probe of the analysis instrument and the smoke can be increased.
The analytical instrument without self-absorption function adopts an AMETEK 210 type oxygen content analyzer.
The invention also comprises a temperature sensor for detecting the sampling branch pipe and a temperature sensor for detecting the temperature in the flue, wherein a detection signal input port of the controller is respectively connected with a detection signal output port of the temperature sensor for detecting the sampling branch pipe and a detection signal output port of the temperature sensor for detecting the temperature in the flue.
The temperature sensor for detecting the sampling branch pipe is arranged on the outer wall of the sampling branch pipe 5 two meters above the joint of the sampling branch pipe 5 and the flue 30. The temperature sensor is arranged on the outer wall of the sampling branch pipe 5, so that the sampling pipe can be prevented from being blocked. The temperature sensor can also be arranged on the inverted L-shaped horizontal section. The temperature sensor is arranged two meters above the connection part of the sampling branch pipe 5 and the flue 30, so that the misalignment of temperature measuring points caused by the heat conduction of the metal pipeline can be prevented.
And the outer wall of the sampling branch pipe 5 between the rotational flow mixing chamber 4 and the flue 30 is subjected to heat preservation treatment except the position where the temperature sensor of the sampling branch pipe is arranged. The flue gas temperature is higher than the ambient temperature and the sampling branch pipe 5 will be heated when the sample gas flows through the sampling branch pipe 5. In order to ensure that when faults such as blockage occur to the branch pipe, the temperature of the sampling branch pipe 5 is rapidly reduced, and the temperature measuring part of the sampling branch pipe 5 is not insulated.
The controller detects the temperature of each sampling branch pipe 5, and if the deviation between the temperature of a certain sampling branch pipe 5 and the temperature of other sampling branch pipes 5 or the flue temperature 32 exceeds a set value, the controller sends a blocking signal of the sampling branch pipe 5 to control the undisturbed blowback device to purge the sampling device.
The volume of the sample air cavity 9 is larger than the sum of the volumes of the rotational flow mixing chamber 4 and each sampling branch pipe 5; ensuring the full and fast sample gas suction and return of the pipeline purging.
A sampling branch electromagnetic valve 1 is arranged on a transverse pipe at the upper end of the sampling branch 5, and a control signal input port of the sampling branch electromagnetic valve 1 is connected with a control signal output port of the controller. In the sampling state, the sampling branch pipe electromagnetic valve 1 and the sample gas cavity exhaust valve 24 are opened, and the purging three-way valve 17 is closed.
The sampling branch pipes 5 extend into the flue 30 at different depths; the detection is more comprehensive and accurate.
The working process of the invention is explained below with reference to the drawings.
When the blockage occurs (taking the blockage of the sampling branch pipe 5a as an example), the temperature of the sampling branch pipe 13a is lower than that of the sampling branch pipes 13b, 13c, 13d and 32d, the controller judges that the sampling branch pipe 5a is blocked, sends a signal to close the exhaust valve 24 of the sample air cavity and the electromagnetic valves 1b, 1c and 1d of the sampling branch pipes, and opens the purging three-way valve 17. Compressed air enters a compressed air cavity 21 through an air inlet and outlet pipe 18 from a compressed air storage tank 6 and a compressed air source 22, pushes a pneumatic film 15 and a spring tray 20 to extrude an air suction spring 11, so that sample air in a sample air cavity 9 enters a rotational flow mixing chamber 4 through a probe blowing check nozzle 8 to blow a measuring instrument probe filter 3. Meanwhile, the exhaust check valve 12 is automatically closed, the pressure in the cyclone mixing chamber 4 is increased, the sample gas enters the sampling branch pipe 5a for purging, the limit feedback plate 36 moves to the upper-sweeping limit switch, and the upper-sweeping limit switch signals the controller to complete the purging.
After purging is finished, the controller sends a signal to close the purging three-way valve 17, the sampling branch pipe electromagnetic valves 1b, 1c and 1d are opened, the pneumatic film 15 moves downwards under the action of the air suction spring 11, the volume of the compressed air cavity 21 is reduced, compressed air is exhausted through the exhaust pipe 31 and the purging three-way valve 17, the sample gas cavity 9 expands in volume to generate negative pressure, sample gas is sucked through the sampling branch pipes 5a, 5b, 5c and 5d and the cyclone mixing chamber 4, the limit feedback plate 36 moves to the lower sampling limit switch 35, the lower sampling limit switch 35 sends a signal to the controller, and the controller controls the sample gas cavity exhaust valve 24 to be opened, so that the sampling state is recovered. Similarly, different pipelines can be purged by controlling the sampling branch solenoid valve 1.
The blowing cycle is determined by the pressure of compressed air, the pipe diameter of each part, the strength of the suction spring 11 and the volume of the cavity, and is generally completed within seconds. The purging gas is sample gas, and the sample gas can be quickly sucked back after being blown into the cyclone mixing chamber 4 and the sampling branch pipe 5, so that the continuity of the measurement of the instrument can be ensured; the process of back flushing the blockage does not influence the continuous monitoring of the gas.
It should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, not limitation, and it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention; as long as the use requirements are met, the method is within the protection scope of the invention.
Claims (8)
1. An undisturbed back-blowing device comprises an air cavity, and is characterized in that the middle of the upper end of the air cavity is provided with a mixing chamber exhaust back valve, the upper end of the air cavity is provided with a probe blowing back check nozzle which blows air to the upper middle part around the mixing chamber exhaust back valve, an air pump is arranged at the middle outlet of the lower end of the air cavity, the inner wall of the lower end of the air cavity is provided with a pneumatic film around the middle outlet of the lower end of the air cavity, the periphery of the pneumatic film is connected with the wall of the air cavity, a compressed air cavity is arranged between the pneumatic film and the inner wall of the lower end of the air cavity, a sample air cavity is arranged between the pneumatic film and the inner wall of the upper end of the air cavity, and the compressed air cavity is connected with compressed air inlet and outlet equipment;
the upper end of the middle part of the pneumatic film is connected with a spring tray, the middle opening of the spring tray is communicated with the middle outlet of the lower end of the air cavity, and an air suction spring is arranged between the spring tray and the inner wall of the upper end of the air cavity;
the lower end of a hollow exhaust shaft sequentially penetrates through the middle opening of the spring tray, the middle outlet of the lower end of the air cavity is connected with the inlet of the air pump, the upper end of the hollow exhaust shaft is exposed out of the middle opening of the spring tray and is provided with an upper sealing pressure plate, the lower end surface of the upper sealing pressure plate is extruded with the upper end surface of the middle part of the spring tray, the outer side of the hollow exhaust shaft in the compressed air cavity is provided with a lower sealing pressure plate, and the upper end surface of the lower sealing pressure plate is extruded with the lower end surface of the middle part of the pneumatic film; the lower sealing pressure plate is tightly connected with the upper sealing pressure plate, so that the upper end of the hollow exhaust shaft, the spring tray and the middle part of the pneumatic film are connected together;
the compressed air inlet and exhaust equipment comprises an inlet and exhaust pipe communicated with the compressed air cavity, the outer end of the inlet and exhaust pipe is connected with a first end of a purging three-way valve, a second end of the purging three-way valve is respectively connected with a compressed air source and a compressed air storage tank, and a third end of the purging three-way valve is an exhaust port; and a control signal input port of the purging three-way valve is connected with a control signal output port of the controller.
2. The apparatus of claim 1, wherein the lower end of the hollow exhaust shaft is connected to the inlet of the suction pump via an exhaust extension tube.
3. The apparatus of claim 1, wherein the hollow vent shaft is connected to the lower middle outlet of the air cavity by a sealing ring.
4. The apparatus of claim 1, wherein the number of the suction springs is four, and the suction springs are uniformly distributed around the opening of the spring tray.
5. The apparatus of claim 1, wherein the hollow exhaust shaft is provided with a sample gas chamber exhaust valve, and a control signal input port of the sample gas chamber exhaust valve is connected to a control signal output port of the controller.
6. The apparatus according to claim 1, wherein the hollow exhaust shaft is provided with a limit feedback plate, and an upper purge limit switch and a lower sample limit switch are provided corresponding to the limit feedback plate, and a detection signal output port of the upper purge limit switch and a detection signal output port of the lower sample limit switch are respectively connected to a detection signal input port of the controller.
7. The apparatus of claim 1, wherein the upper end of the probe purge check nozzle is coupled to a check valve that can be flipped up and out.
8. The apparatus of claim 1, wherein the air chambers comprise an upper air chamber housing and a lower air chamber housing which are connected with each other in a snap-fit manner, the upper air chamber housing and the lower air chamber housing are connected with each other in a snap-fit manner through upper and lower flanges, and the periphery of the pneumatic membrane is sandwiched between the upper and lower flanges.
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| CN201710932041.8A CN107570497B (en) | 2017-10-10 | 2017-10-10 | Undisturbed back flushing device |
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| CN201710932041.8A CN107570497B (en) | 2017-10-10 | 2017-10-10 | Undisturbed back flushing device |
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| CN107570497A CN107570497A (en) | 2018-01-12 |
| CN107570497B true CN107570497B (en) | 2023-04-07 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5090963A (en) * | 1990-10-19 | 1992-02-25 | Product Development (Z.G.S.) Ltd. | Electrochemically driven metering medicament dispenser |
| US5797517A (en) * | 1996-10-25 | 1998-08-25 | Primary Delivery Systems, Inc. | Liquid pump dispenser with tri-purpose nozzle |
| TWM281945U (en) * | 2005-04-29 | 2005-12-01 | She-Bin Chang | Reversal-deposition isolated pressurized barrel |
| CN201207023Y (en) * | 2008-05-16 | 2009-03-11 | 韩琼 | On-line measurement system for boiler discharging flue gas field |
| CN202954403U (en) * | 2012-10-13 | 2013-05-29 | 温岭市联华机械有限公司 | Membrane type air pressure tank |
| CN204694507U (en) * | 2015-05-14 | 2015-10-07 | 中广核中电能源服务（深圳）有限公司 | Boiler smoke multi-point sampling system and boiler smoke sample can thereof |
| CN104964856A (en) * | 2015-07-10 | 2015-10-07 | 国家电网公司 | Power station boiler smoke sampling device |
| CN205981740U (en) * | 2016-08-25 | 2017-02-22 | 南京中电环保科技有限公司 | Flue gas able to programme prevents that stifled sampler pressure differential pressure sweeps control box |
| CN207463749U (en) * | 2017-10-10 | 2018-06-08 | 冷猛 | A kind of unperturbed back-blowing device |
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