CN222489402U - Rotary guiding compressed air buffer tank - Google Patents
Rotary guiding compressed air buffer tank Download PDFInfo
- Publication number
- CN222489402U CN222489402U CN202421275659.3U CN202421275659U CN222489402U CN 222489402 U CN222489402 U CN 222489402U CN 202421275659 U CN202421275659 U CN 202421275659U CN 222489402 U CN222489402 U CN 222489402U
- Authority
- CN
- China
- Prior art keywords
- compressed air
- buffer tank
- air buffer
- rotary guide
- guide type
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000004140 cleaning Methods 0.000 claims abstract description 31
- 238000007790 scraping Methods 0.000 claims abstract description 18
- 238000009434 installation Methods 0.000 claims description 15
- 238000003780 insertion Methods 0.000 claims description 14
- 230000037431 insertion Effects 0.000 claims description 14
- 239000012535 impurity Substances 0.000 abstract description 20
- 239000007789 gas Substances 0.000 description 19
- 238000000034 method Methods 0.000 description 7
- 238000005096 rolling process Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000010405 clearance mechanism Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
The utility model relates to the technical field of compressed air buffer tanks, and discloses a rotary guide type compressed air buffer tank which comprises a fixed underframe, wherein a rotary guide type compressed air buffer tank body is fixedly arranged in the fixed underframe, a spiral rotating channel is arranged in the rotary guide type compressed air buffer tank body, an air outlet pipe is fixedly arranged on the right side of the rotary guide type compressed air buffer tank body, a cleaning mechanism is arranged at the top of the rotary guide type compressed air buffer tank body, a dismounting mechanism is arranged at the top of the rotary guide type compressed air buffer tank body, the cleaning mechanism comprises a scraping assembly and an adjusting assembly, and the adjusting assembly is arranged on the left side of the scraping assembly. Scraping operation is carried out on the filter screen, the follow-up operation on gas is influenced, the impurity on the surface of the filter screen is scraped down by the rotary scraping plate, and the control operation is carried out on the speed of the gas introduced into the rotary guiding type compressed air buffer tank body.
Description
Technical Field
The utility model relates to the technical field of compressed air buffer tanks, in particular to a rotary guide type compressed air buffer tank.
Background
A compressed air buffer tank is a device used in a pipeline system, which is usually placed at the tail end of a pipeline, and is usually composed of a solid steel cylinder and a safety valve.
The invention discloses a rotary guide type compressed air buffer tank according to the description in a rotary guide type compressed air buffer tank (the authorized publication number is CN 103418188B) disclosed by a patent net, and solves the problem that a compressed air filtering device in the existing air nitrogen preparation system has incomplete moisture removal. Including being provided with spiral rotatory passageway groove (3) on the cylindrical inside wall in buffer tank body (2), be provided with fan-shaped fin (4) in spiral rotatory passageway groove (3) interval, the ratio of width (H) of fan-shaped fin (4) and the radius (R) of the cross section of cylindrical buffer tank body (2) is 2:5, intake pipe (7) are L shape in buffer tank body (2), the L shape of intake pipe (7) is gone into the gas port and is set up in the top of the fan-shaped fin that the bottom mounting of spiral rotatory passageway groove (3) set up, outlet duct (8) are the shape of a word cantilever in buffer tank body (2), the central point that goes into gas port (11) setting in buffer tank body (2) of outlet duct (8). The overall running performance and the nitrogen production quality level of the air separation equipment are improved. "
With respect to the above description, the applicant believes that the following problems exist:
In the use process, the whole system can filter out liquid water in the buffer tank under the condition of not adding equipment by the aid of the arranged rotary flow direction of the compressed air in the buffer tank, but in actual use, the compressed air is filtered by the aid of the spiral rotary channel grooves in the tank body, the filtering holes in the through grooves are easily blocked by impurities, so that the subsequent filtering efficiency of the compressed air is low, and the rotary guide type compressed air buffer tank is needed to be improved to solve the problems.
Disclosure of utility model
The present utility model is directed to a rotary guiding compressed air buffer tank, which solves the above-mentioned problems.
The rotary guide type compressed air buffer tank comprises a fixed underframe, wherein a rotary guide type compressed air buffer tank body is fixedly arranged in the fixed underframe, a spiral rotating channel is arranged in the rotary guide type compressed air buffer tank body, an air outlet pipe is fixedly arranged on the right side of the rotary guide type compressed air buffer tank body, a cleaning mechanism is arranged at the top of the rotary guide type compressed air buffer tank body, and a dismounting mechanism is arranged at the top of the rotary guide type compressed air buffer tank body;
the cleaning mechanism comprises a scraping assembly and an adjusting assembly, wherein the adjusting assembly is arranged on the left side of the scraping assembly.
Preferably, the scraping assembly comprises a cleaning box, cleaning box fixed mounting is at rotary guide formula compressed air buffer tank body top, cleaning box right side fixed mounting has intake pipe one, an inside fixed mounting of intake pipe has the mount, inside rotation of mount installs the dwang, dwang right side fixed mounting has the impeller, cleaning box inside fixed mounting has the dead lever, the one end fixed mounting that the impeller was kept away from to the dwang has the scraper blade, cleaning box inside slidable mounting has the filter screen, filter screen bottom right side fixed mounting has the collection frame, cleaning box left side fixed mounting has the connecting pipe, and the filter screen filters the impurity in the gas, prevents that the gas impurity that gets into inside rotary guide formula compressed air buffer tank body is too much.
Preferably, the rotating rod is rotatably arranged inside the fixed rod, and the filter screen is attached to the left side of the scraping plate to scrape the filter screen.
Preferably, the adjusting part comprises a mounting plate, mounting plate fixed mounting is in the connecting pipe bottom, the mounting plate bottom rotates and installs the rolling disc, rolling disc outside fixed mounting has outer ring gear, rolling disc inside slidable mounting has the stopper, stopper bottom fixed mounting has special-shaped sliding block, rotatory direction formula compressed air buffer tank body top fixed mounting has intake pipe two, intake pipe two top fixed mounting has the installation base, rotatory direction formula compressed air buffer tank body top fixed mounting has the motor, motor output fixed mounting has the gear, carries out control operation to the speed of letting in the inside gas of rotatory direction formula compressed air buffer tank body.
Preferably, the gear is meshed with the external gear ring, installation base fixed mounting is at rotatory direction formula compressed air buffer tank body top, external gear ring rotates and installs at installation base top, mounting panel fixed mounting is at rotatory direction formula compressed air buffer tank body top, and the spout has been seted up to the position department that the rolling disc corresponds with the stopper, just stopper slidable mounting is inside the spout, the spout has been seted up to the position department that installation base corresponds with special-shaped sliding block, just special-shaped sliding block slidable mounting is inside the spout, stopper and special-shaped sliding block are provided with six groups, and circumference distribution is inside the rolling disc, controls open-ended size.
Preferably, the dismounting mechanism comprises a fixed frame, fixed frame fixed mounting is positive at the cleaning box, fixed frame inside fixed mounting has the spring, the one end fixed mounting that the fixed frame was kept away from to the spring has the slider, slider left side fixed mounting has the inserted block, the positive fixed mounting of slider has the pull rod, the positive fixed mounting of filter screen has the inserted frame to the impurity of filter screen inside jam to and the inside impurity of collection frame clear up, prepare for next time lets in gas.
Preferably, the fixed frame is internally provided with a sliding block in a sliding manner, the insertion groove is formed in the position of the insertion frame corresponding to the insertion block, and the insertion block is inserted into the insertion frame, so that the filter screen and the collection frame can be conveniently taken down.
Compared with the prior art, the utility model provides the rotary guide type compressed air buffer tank, which has the following beneficial effects:
1. This rotatory direction formula compressed air buffer tank, through the clearance mechanism that sets up, in the use, scrape the operation to the filter screen, the filter screen filters the impurity in the gas, prevent that the gaseous impurity that gets into inside rotatory direction formula compressed air buffer tank body is too much, influence the follow-up operation to gas, rotate the scraper blade and scrape down the impurity on filter screen surface, scrape inside the collection frame, collect the impurity, control the open-ended size, and then can control the operation to the speed that lets in inside gas of rotatory direction formula compressed air buffer tank body.
2. This rotatory direction formula compressed air buffer tank through the disassembly body who sets up, in the use, takes off the filter screen, clears up the impurity of filter screen inside jam to and collect the inside impurity of frame, for letting in gas in the next time and prepare.
Drawings
For a clearer description of the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly described below, it will be apparent that the drawings in the description below are only some embodiments of the present utility model, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art:
FIG. 1 is a schematic view of the appearance structure of the present utility model;
FIG. 2 is a schematic diagram of the internal structure of the present utility model;
FIG. 3 is a schematic cross-sectional view of a scraping assembly of the present utility model;
FIG. 4 is an exploded view of the adjustment assembly of the present utility model;
fig. 5 is an exploded view of the disassembly mechanism of the present utility model.
In the figure, 1, a fixed underframe, 2, a cleaning mechanism, 21, a scraping assembly, 211, a cleaning box, 212, a first air inlet pipe, 213, a fixed frame, 214, an impeller, 215, a rotating rod, 216, a scraping plate, 217, a fixed rod, 218, a filter screen, 219, a collecting frame, 2110, a connecting pipe, 22, an adjusting assembly, 221, a mounting plate, 222, a rotating disc, 223, an external tooth ring, 224, a limiting block, 225, a special-shaped sliding block, 226, a mounting base, 227, a second air inlet pipe, 228, a motor, 229, a gear, 3, a dismounting mechanism, 31, a fixed frame, 32, a spring, 33, a sliding block, 34, an inserting block, 35, a pull rod, 36, an inserting frame, 4, a rotary guide type compressed air buffer tank body, 5, an air outlet pipe, 6 and a spiral rotating channel.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
Embodiment one:
Referring to fig. 1-4, the utility model provides a technical scheme that the rotary guiding type compressed air buffer tank comprises a fixed underframe 1, wherein a rotary guiding type compressed air buffer tank body 4 is fixedly arranged in the fixed underframe 1, a spiral rotary channel 6 is arranged in the rotary guiding type compressed air buffer tank body 4, an air outlet pipe 5 is fixedly arranged on the right side of the rotary guiding type compressed air buffer tank body 4, a cleaning mechanism 2 is arranged at the top of the rotary guiding type compressed air buffer tank body 4, and a dismounting mechanism 3 is arranged at the top of the rotary guiding type compressed air buffer tank body 4;
The cleaning mechanism 2 comprises a scraping assembly 21 and an adjusting assembly 22, the adjusting assembly 22 being arranged to the left of the scraping assembly 21.
Further, the scraping assembly 21 comprises a cleaning box 211, the cleaning box 211 is fixedly arranged at the top of the rotary guide type compressed air buffer tank body 4, an air inlet pipe 212 is fixedly arranged on the right side of the cleaning box 211, a fixing frame 213 is fixedly arranged in the air inlet pipe 212, a rotating rod 215 is rotatably arranged in the fixing frame 213, an impeller 214 is fixedly arranged on the right side of the rotating rod 215, a fixing rod 217 is fixedly arranged in the cleaning box 211, a scraper 216 is fixedly arranged at one end, far away from the impeller 214, of the rotating rod 215, a filter screen 218 is slidably arranged in the cleaning box 211, a collecting frame 219 is fixedly arranged on the right side of the bottom of the filter screen 218, a connecting pipe 2110 is fixedly arranged on the left side of the cleaning box 211, and the filter screen 218 filters impurities in gas so as to prevent excessive gas impurities entering the rotary guide type compressed air buffer tank body 4.
Further, the rotating rod 215 is rotatably installed inside the fixing rod 217, and the filter screen 218 is attached to the left side of the scraper 216, so that the filter screen 218 is scraped.
Further, the adjusting component 22 comprises a mounting plate 221, the mounting plate 221 is fixedly mounted at the bottom of the connecting pipe 2110, a rotating disc 222 is rotatably mounted at the bottom of the mounting plate 221, an outer toothed ring 223 is fixedly mounted outside the rotating disc 222, a limiting block 224 is slidably mounted inside the rotating disc 222, a special-shaped sliding block 225 is fixedly mounted at the bottom of the limiting block 224, a second air inlet pipe 227 is fixedly mounted at the top of the rotary guiding type compressed air buffer tank body 4, a mounting base 226 is fixedly mounted at the top of the second air inlet pipe 227, a motor 228 is fixedly mounted at the top of the rotary guiding type compressed air buffer tank body 4, a gear 229 is fixedly mounted at the output end of the motor 228, and the speed of gas introduced into the rotary guiding type compressed air buffer tank body 4 is controlled.
Further, the gear 229 is meshed with the outer gear ring 223, the installation base 226 is fixedly installed at the top of the rotary guide type compressed air buffer tank body 4, the outer gear ring 223 is rotatably installed at the top of the installation base 226, the installation plate 221 is fixedly installed at the top of the rotary guide type compressed air buffer tank body 4, the sliding groove is formed in the position of the rotating disc 222 corresponding to the limiting block 224, the limiting block 224 is slidably installed inside the sliding groove, the sliding groove is formed in the position of the installation base 226 corresponding to the special-shaped sliding block 225, the special-shaped sliding block 225 is slidably installed inside the sliding groove, six groups of limiting blocks 224 and the special-shaped sliding blocks 225 are arranged, the circumferences of the limiting blocks are distributed inside the rotating disc 222, and the size of the opening is controlled.
Embodiment two:
Referring to fig. 5, and further obtaining in combination with the first embodiment, the disassembling mechanism 3 includes a fixing frame 31, the fixing frame 31 is fixedly installed on the front of the cleaning box 211, a spring 32 is fixedly installed inside the fixing frame 31, a sliding block 33 is fixedly installed at one end of the spring 32 far away from the fixing frame 31, an inserting block 34 is fixedly installed at the left side of the sliding block 33, a pull rod 35 is fixedly installed on the front of the sliding block 33, an inserting frame 36 is fixedly installed on the front of the filter screen 218, and impurities blocked inside the filter screen 218 and impurities inside the collecting frame 219 are cleaned in preparation for next air ventilation.
Further, the sliding block 33 is slidably mounted in the fixed frame 31, the insertion slot is formed at the position corresponding to the insertion block 34 of the insertion frame 36, and the insertion block 34 is inserted into the insertion frame 36, so that the filter screen 218 and the collecting frame 219 can be conveniently removed.
In actual operation, when this device is used, let in rotatory direction formula compressed air buffer tank body 4 inside through intake pipe one 212 with gas, when gas gets into intake pipe one 212 inside, drive impeller 214 rotation, impeller 214 rotates and make scraper blade 216 rotate through dwang 215, and then scrape the operation to filter screen 218, filter the impurity in the gas, prevent to get into the inside gaseous impurity of rotatory direction formula compressed air buffer tank body 4 too much, influence the follow-up operation to gas, the impurity of rotating scraper blade 216 with filter screen 218 surface is scraped, scrape the collection frame 219 inside, collect the impurity, starter motor 228, the motor 228 output drives gear 229 rotation, gear 229 rotates and drives the outer tooth ring 223 rotation with it, outer tooth ring 223 rotates and makes installation base 226 rotate, and then make stopper 224 slide in the spout inside of installation base 226 surface, and then make special-shaped sliding block 225 slide in the spout inside of installation base 226 surface, and then control the open-ended size, and then can control the operation to the rate of let in the inside gas of rotatory direction formula compressed air buffer tank body 4, let in, after the gas is accomplished, dial right side 35 and drive the gear 229 rotation, gear 229 rotation drives gear 229 rotation, and drive external tooth ring 223 rotation with it is in the rotation of it, and then makes the inside of the filter screen 218 is moved down to take out to the filter screen 34, and insert the inside is the filter screen is the inside to be the filter screen is removed, and the filter screen is removed to the inside is moved down to the filter screen is moved down.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
Claims (7)
1. The rotary guide type compressed air buffer tank comprises a fixed underframe (1) and is characterized in that a rotary guide type compressed air buffer tank body (4) is fixedly installed inside the fixed underframe (1), a spiral rotating channel (6) is arranged inside the rotary guide type compressed air buffer tank body (4), an air outlet pipe (5) is fixedly installed on the right side of the rotary guide type compressed air buffer tank body (4), a cleaning mechanism (2) is arranged at the top of the rotary guide type compressed air buffer tank body (4), and a detaching mechanism (3) is arranged at the top of the rotary guide type compressed air buffer tank body (4);
the cleaning mechanism (2) comprises a scraping assembly (21) and an adjusting assembly (22), wherein the adjusting assembly (22) is arranged on the left side of the scraping assembly (21).
2. The rotary guide type compressed air buffer tank according to claim 1, wherein the scraping assembly (21) comprises a cleaning tank (211), the cleaning tank (211) is fixedly installed at the top of the rotary guide type compressed air buffer tank body (4), an air inlet pipe I (212) is fixedly installed on the right side of the cleaning tank (211), a fixing frame (213) is fixedly installed in the air inlet pipe I (212), a rotating rod (215) is rotatably installed in the fixing frame (213), an impeller (214) is fixedly installed on the right side of the rotating rod (215), a fixing rod (217) is fixedly installed in the cleaning tank (211), a scraping plate (216) is fixedly installed at one end, far away from the impeller (214), of the rotating rod (215), a filter screen (218) is fixedly installed in a sliding mode in the cleaning tank (211), a collecting frame (219) is fixedly installed on the right side of the bottom of the filter screen (218), and a connecting pipe (2110) is fixedly installed on the left side of the cleaning tank (211).
3. The rotary guide type compressed air buffer tank according to claim 2, wherein the rotating rod (215) is rotatably installed inside the fixed rod (217), and the filter screen (218) is attached to the left side of the scraper (216).
4. The rotary guide type compressed air buffer tank according to claim 2, wherein the adjusting component (22) comprises a mounting plate (221), the mounting plate (221) is fixedly mounted at the bottom of the connecting pipe (2110), a rotating disc (222) is rotatably mounted at the bottom of the mounting plate (221), an outer toothed ring (223) is fixedly mounted outside the rotating disc (222), a limiting block (224) is slidably mounted inside the rotating disc (222), a special-shaped sliding block (225) is fixedly mounted at the bottom of the limiting block (224), an air inlet pipe II (227) is fixedly mounted at the top of the rotary guide type compressed air buffer tank body (4), a mounting base (226) is fixedly mounted at the top of the air inlet pipe II (227), a motor (228) is fixedly mounted at the top of the rotary guide type compressed air buffer tank body (4), and a gear (229) is fixedly mounted at the output end of the motor (228).
5. The rotary guide type compressed air buffer tank according to claim 4, wherein the gear (229) is meshed with the outer gear ring (223), the installation base (226) is fixedly installed at the top of the rotary guide type compressed air buffer tank body (4), the outer gear ring (223) is rotatably installed at the top of the installation base (226), the installation plate (221) is fixedly installed at the top of the rotary guide type compressed air buffer tank body (4), the sliding groove is formed in the position, corresponding to the limiting block (224), of the rotating disc (222), the limiting block (224) is slidably installed in the sliding groove, the sliding groove is formed in the position, corresponding to the special-shaped sliding block (225), of the installation base (226), the limiting block (224) and the special-shaped sliding block (225) are slidably installed in the sliding groove, six groups of the limiting block (224) and the special-shaped sliding block (225) are circumferentially distributed in the rotating disc (222).
6. The rotary guide type compressed air buffer tank according to claim 2, wherein the dismounting mechanism (3) comprises a fixed frame (31), the fixed frame (31) is fixedly installed on the front face of the cleaning box (211), a spring (32) is fixedly installed inside the fixed frame (31), a sliding block (33) is fixedly installed at one end, far away from the fixed frame (31), of the spring (32), an inserting block (34) is fixedly installed on the left side of the sliding block (33), a pull rod (35) is fixedly installed on the front face of the sliding block (33), and an inserting frame (36) is fixedly installed on the front face of the filter screen (218).
7. The rotary guide type compressed air buffer tank according to claim 6, wherein a sliding block (33) is slidably installed inside the fixed frame (31), a slot is formed in a position, corresponding to the insertion block (34), of the insertion frame (36), and the insertion block (34) is inserted inside the insertion frame (36).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421275659.3U CN222489402U (en) | 2024-06-05 | 2024-06-05 | Rotary guiding compressed air buffer tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421275659.3U CN222489402U (en) | 2024-06-05 | 2024-06-05 | Rotary guiding compressed air buffer tank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN222489402U true CN222489402U (en) | 2025-02-18 |
Family
ID=94558068
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202421275659.3U Active CN222489402U (en) | 2024-06-05 | 2024-06-05 | Rotary guiding compressed air buffer tank |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN222489402U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN120393611A (en) * | 2025-05-13 | 2025-08-01 | 巨海能源科技(徐州)有限公司 | A thermal power generation flue gas exceeding standard early warning device |
-
2024
- 2024-06-05 CN CN202421275659.3U patent/CN222489402U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN120393611A (en) * | 2025-05-13 | 2025-08-01 | 巨海能源科技(徐州)有限公司 | A thermal power generation flue gas exceeding standard early warning device |
| CN120393611B (en) * | 2025-05-13 | 2026-01-27 | 巨海能源科技(徐州)有限公司 | Thermal power flue gas exceeds standard early warning device |
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