CN112432202A - Injection type fire detection air cooling device - Google Patents
Injection type fire detection air cooling device Download PDFInfo
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- CN112432202A CN112432202A CN202011359335.4A CN202011359335A CN112432202A CN 112432202 A CN112432202 A CN 112432202A CN 202011359335 A CN202011359335 A CN 202011359335A CN 112432202 A CN112432202 A CN 112432202A
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- pipe section
- fire detection
- air
- cold air
- throat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M11/00—Safety arrangements
- F23M11/04—Means for supervising combustion, e.g. windows
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L1/00—Passages or apertures for delivering primary air for combustion
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fire-Detection Mechanisms (AREA)
Abstract
The invention discloses an injection type fire detection air cooling device. The ejector comprises a cold air flow channel, a hot primary air inlet pipe section, a reducing pipe section, a throat pipe section, a diffusion pipe section and a straight pipe section, wherein the reducing pipe section, the throat pipe section, the diffusion pipe section and the straight pipe section are sequentially connected into a whole; one end of the cold air flow channel is connected with the fire detection probe, the other end of the cold air flow channel enters the tapered pipe section and extends to the throat pipe section, and an annular hot air channel is formed among the cold air flow channel, the tapered pipe section and the throat pipe section; an air filter screen and an electromagnetic valve are arranged on a cold air flow channel between the fire detection probe and the reducing pipe section. The invention utilizes the mode of hot primary air suction cold air to cool the fire detection probe, thereby avoiding that a large amount of cold air is directly blown into a combustion area to reduce the combustion efficiency of the combustor.
Description
Technical Field
The invention belongs to the field of boiler combustion monitoring, and relates to an injection type fire detection air cooling device.
Background
The flame detection system is an important component of a furnace safety monitoring system. Accurate timely fire detection signal direct relation is gone into to the safety and stability operation of furnace and whole unit, and many thermal power plants still appear at present that the intensity is weak, fire is examined when cooling untimely burning loss fire and is examined probe deposition scheduling problem is examined to the fire, causes the production accident, leads to great loss.
The traditional method generally adopts a fire detection cooling fan to cool a fire detection probe, the fire detection cooling fan is installed on a steel framework, when the fire detection cooling fan operates for a long time, the vibration of the fire detection cooling fan is gradually increased, the fire detection cooling fan is seriously or even caused to break down, and therefore more and more power plants begin to adopt cold primary air to cool the fire detection probe.
When the fire detection probe is cooled by cold primary air, the outlet of the fire detection probe is just opposite to the combustion area, and the temperature of the fire detection cooling air is lower, so that the combustion process is not facilitated.
Disclosure of Invention
In order to make up the defects of the prior art, the invention provides the injection type fire detection air cooling device, so that the combustion process of a boiler is optimized, and meanwhile, the fire detection probe is ensured to be cooled in time.
The technical scheme adopted by the invention is as follows: an injection type fire detection air cooling device comprises a fire detection probe, an air filter screen, an electromagnetic valve, an injector and a secondary air box;
the ejector comprises a cold air flow channel, a hot primary air inlet pipe section, a reducing pipe section, a throat pipe section, a diffusion pipe section and a straight pipe section, wherein the reducing pipe section, the throat pipe section, the diffusion pipe section and the straight pipe section are sequentially connected into a whole;
one end of the cold air flow channel is connected with the fire detection probe, the other end of the cold air flow channel enters the tapered pipe section and extends to the throat pipe section, and an annular hot air channel is formed among the cold air flow channel, the tapered pipe section and the throat pipe section; and an air filter screen and an electromagnetic valve are arranged on a cold air flow channel between the fire detection probe and the reducing pipe section.
When the invention is used, hot primary air is used as active air flow, the flow speed is accelerated when the hot primary air flows through the reducing pipe, a low-pressure area is formed at a cold air outlet, so that cold air is pumped into the throat pipe section through the air filter screen, and finally mixed air is sent into a hearth after being decelerated and boosted through the diffusion pipe section.
The invention utilizes the mode of hot primary air suction cold air to cool the fire detection probe, thereby avoiding that a large amount of cold air is directly blown into a combustion area to reduce the combustion efficiency of the combustor.
As a supplement to the technical scheme, the fire detection probe is an external peeping type fire detection probe and is in threaded connection with the cold air flow channel.
As a supplement to the technical scheme, the air filter screen is cylindrical and covers the outer side of the cold air flow channel, cold air enters the cold air flow channel from the air filter screen, the air filter screen is made of melt-blown fabric, and the resistance is not more than 20 Pa.
As a supplement to the technical scheme, when the hot primary air pressure reaches 5kpa, the electromagnetic valve is opened, the fire detection probe starts to work, and when the furnace is shut down, the electromagnetic valve is closed first, and then the hot primary air supply is stopped.
As a supplement to the technical scheme, the ejector ejects the cold air to the hot primary air active airflow with the ejection ratio of 0.2-0.5.
As a supplement to the above technical scheme, the diameter of the hot primary air inlet pipe section is 140mm, the diameter of the inlet end of the reducing pipe section is 160mm, the diameter of the outlet end is equal to that of the throat pipe section, and the ratio of the length of the reducing pipe section to the diameter of the inlet end is greater than 2: 1.
As a supplement to the technical scheme, the length of the throat section is 40-80mm, and the ratio of the diameter of the cold air flow passage to the diameter of the throat section is 1:1.2-1: 2.
As a supplement to the technical scheme, one end of the diffusion pipe section is connected with the throat pipe section, the diameter of the diffusion pipe section is equal to that of the throat pipe section, the diameter of the other end of the diffusion pipe section is equal to that of the inlet end of the tapered pipe section, the diffusion pipe section extends into the secondary air box, the length of the diffusion pipe section is 800mm, and the outlet end of the diffusion pipe section is connected with the straight pipe section.
As a supplement to the technical scheme, the hot primary air enters the fire detection cooling air main pipe from the hot primary air main pipe, and is distributed to each hot primary air inlet pipe section from the fire detection cooling air main pipe, and the diameter of the fire detection cooling air main pipe is 240-260 mm.
As the supplement of the technical scheme, the fire detection cooling fan is adopted as a standby fan and connected to a fire detection cooling air main pipe. The fire detection cooling fan is used as a standby, and the auxiliary power is saved.
The invention has the following beneficial effects:
1. no moving parts are needed during normal operation, and the service life is long.
2. And redundant hot primary air is used as cooling air for fire detection, so that the power consumption of a plant is saved.
3. The outlet area of the burner is prevented from being blown by a large amount of cold air, and the combustion process is facilitated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural view of an injection type fire detection air cooling device according to the present invention;
FIG. 2 is a cross-sectional view taken along line A-A of the cold air screen of the present invention;
FIG. 3 is a cross-sectional view B-B of the eductor of the present invention;
in the figure, 1-fire detection probe, 2-air filter screen, 3-electromagnetic valve, 4-hot primary air inlet pipe section, 5-reducing pipe section, 6-secondary air box, 7-diffusion pipe section, 8-cold air flow channel, 9-cold air outlet, 10-throat pipe section and 11-hearth.
Detailed Description
The present invention will be described in detail below with reference to examples to enable those skilled in the art to better understand the present invention, but the present invention is not limited to the following examples.
Unless otherwise defined, terms (including technical and scientific terms) used herein should be construed to have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms used herein should be interpreted as having a meaning that is consistent with their meaning in the context of this specification and the relevant art, and should not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Examples
The embodiment is an injection type fire detection air cooling device, including fire detection probe 1, air screen 2, solenoid valve 3, ejector and secondary bellows 6, wherein fire detection probe 1 is the peep formula, and air screen 2 is the cylinder and arranges. The structure of the ejector comprises a cold air flow passage 8, a hot primary air inlet pipe section 4, a reducing pipe section 5, a throat pipe section 10, a diffusion pipe section 7 and a straight pipe section. The reducing pipe section 5, the throat pipe section 10, the diffusion pipe section 7 and the straight pipe section are sequentially connected into a whole, the throat pipe section 10 is located between the reducing pipe section 5 and the diffusion pipe section 7, the hot primary air inlet pipe section 4 is arranged on one side of the large end portion of the reducing pipe section 5, and the straight pipe section penetrates through the secondary air box 6 to enter the outlet of the hearth combustor.
When the invention is used, hot primary air is used as active air flow, the flow speed is accelerated when the hot primary air flows through the reducing pipe, a low-pressure area is formed at a cold air outlet, so that cold air is pumped into the throat pipe section through the air filter screen, and finally mixed air is sent into the hearth 11 after being decelerated and boosted through the diffusion pipe section.
The peep-type fire detection probe 1 is connected with the cold air flow channel 8 through threads.
One end of the cold air flow channel 8 is connected with the fire detection probe 1, the other end of the cold air flow channel extends into the tapered pipe section 5 and extends to the throat pipe section 10, and an annular hot air channel is formed between the cold air flow channel 8 and the tapered pipe section 5 and between the cold air flow channel and the throat pipe section 10.
An air screen 2 and a solenoid valve 3 are arranged on a cold air flow path 8 between the fire detection probe 1 and the tapered pipe section 5. The cold air flow channel 8 has a diameter of 40-60mm and extends into the convergent section 5 at a distance of 10-20mm from the throat section 10.
The air screen 2 covers the outside of the cold air channel, from which the cold air can enter the cold air channel 8. And the material of the air filter screen 2 is melt-blown cloth, and the resistance is not more than 20 Pa.
The hot primary air enters the fire detection cooling air main pipe from the hot primary air main pipe and is distributed to each hot primary air inlet pipe section from the fire detection cooling air main pipe, and the diameter of the fire detection cooling air main pipe is 240-260 mm. The fire detection cooling fan is used as a standby fan and can also be connected to a fire detection cooling air main pipe.
When the hot primary air pressure reaches 5kpa, the electromagnetic valve is allowed to be opened, the fire detection starts to work, and when the furnace is shut down, the electromagnetic valve is closed first, and then the supply of the hot primary air is stopped.
The ratio of the injected cold air to the active hot primary air flow is 0.2-0.5 due to the pressure fluctuation of the hot primary air: 1, and fluctuates.
The diameter of the hot primary air inlet pipe section 4 is 100-140mm, the length of the tapered pipe section 5 is at least 2 times of the diameter of the inlet end of the tapered pipe, in addition, the diameter of the inlet end of the tapered pipe section 5 is set at 140-160mm, and the diameter of the outlet end is equal to the diameter of the throat pipe section 10.
The length of the throat section 10 is 40-80mm, and the ratio of the diameter of the cool air flow passage 8 to the diameter of the throat section 10 is 1:1.2-1: 3.
One end of the diffusion pipe section 7 is connected with the throat section 10, the diameter of the diffusion pipe section is equal to that of the throat section 10, the diameter of the other end of the diffusion pipe section 7 is equal to that of the inlet end of the tapered pipe section 5, the diffusion pipe section extends into the secondary air box 6, and the length of the diffusion pipe section is 800 mm. The outlet end of the diffuser section 7 is connected with the straight pipe section.
Application example
When the invention is applied to a certain 660MW unit, the diameter of the hot primary air inlet pipe section 4 is set to be 120mm, the temperature of the hot primary air is 340 ℃, the pressure is 9.3kPa, the diameter of the inlet of the reducing pipe section 5 is set to be 160mm, and the diameter of the throat pipe section 10 is set to be 100 mm.
The velocity of the hot primary air is as high as 35m/s when it passes through the throat section, and a low pressure region is formed at the cool air outlet 9. The cold air is sucked into the cold air flow channel 8 by the air filter screen 2 and flows out from the cold air outlet 9 to be mixed with the hot primary air, and the temperature of the mixed air is not lower than 280 ℃.
The device can ensure that the fire detection probe is at the ambient temperature of 25 ℃, the amount of cold air injected by each ejector is 0.08t/h, and the amount of consumed hot primary air is 0.23 t/h. The 36 burners comprise 72 fire detection probes for oil fire detection and coal fire detection, and the total consumed heat primary air volume is 16.56t/h and accounts for 5.6 percent of the total heat primary air volume. When the 660MW unit is fully loaded, the total amount of the primary hot air is 294t/h, and the residual amount of the primary hot air is 10%, so that the air volume requirement of fire detection cooling can be met.
Claims (10)
1. An injection type fire detection air cooling device is characterized by comprising a fire detection probe (1), an air filter screen (2), an electromagnetic valve (3), an injector and a secondary air box (6);
the ejector comprises a cold air flow channel (8), a hot primary air inlet pipe section (4), a reducing pipe section (5), a throat pipe section (10), a diffusion pipe section (7) and a straight pipe section, wherein the reducing pipe section (5), the throat pipe section (10), the diffusion pipe section (7) and the straight pipe section are sequentially connected into a whole, the throat pipe section (10) is positioned between the reducing pipe section (5) and the diffusion pipe section (7), the hot primary air inlet pipe section (4) is arranged on one side of the large end part of the reducing pipe section (5), and the straight pipe section penetrates through a secondary air box (6) to enter the outlet of a hearth combustor;
one end of the cold air flow channel (8) is connected with the fire detection probe (1), the other end of the cold air flow channel enters the tapered pipe section (5) and extends to the throat pipe section (10), and an annular hot air channel is formed among the cold air flow channel (8), the tapered pipe section (5) and the throat pipe section (10); an air filter screen (2) and an electromagnetic valve (3) are arranged on a cold air flow channel between the fire detection probe and the reducing pipe section.
2. The injection type fire detection air cooling device according to claim 1, wherein the fire detection probe (1) is an external peep type fire detection probe and is in threaded connection with the cold air flow passage (8).
3. The air cooling device for fire detection of the injection type according to claim 1 or 2, wherein the diameter of the cold air flow passage (8) is 40-60 mm.
4. The air cooling device for the injection fire detection according to claim 1 or 2, wherein the air filter screen (2) is cylindrical and covers the outside of the cold air flow channel (8), the cold air enters the cold air flow channel from the air filter screen (2), and the air filter screen (2) is made of melt-blown fabric.
5. The injection type fire detection air cooling device as claimed in claim 1 or 2, wherein when the hot primary air pressure reaches 5kPa, the electromagnetic valve is opened, and at this time, the fire detection probe starts to operate, and when the furnace is shut down, the electromagnetic valve is closed first, and then the supply of the hot primary air is stopped.
6. The air cooling device for fire detection of the injection type according to claim 1 or 2, wherein the ejector injects cold air and hot primary air to form an active airflow with an injection ratio of 0.2-0.5.
7. The injection type fire detection air cooling device as claimed in claim 1 or 2, wherein the diameter of the primary hot air inlet pipe section (4) is 140mm, the diameter of the inlet end of the tapered pipe section (5) is 140mm and 160mm, the diameter of the outlet end is equal to the diameter of the throat pipe section (10), and the ratio of the length of the tapered pipe section (5) to the diameter of the inlet end is greater than 2: 1.
8. The induction type fire detection air cooling device as claimed in claim 1 or 2, wherein the length of the throat section (10) is 40-80mm, and the ratio of the diameter of the cold air flow passage (8) to the diameter of the throat section (10) is 1:1.2-1: 2.
9. The air cooling device for the injection fire detection according to claim 1 or 2, wherein one end of the diffusion pipe section (7) is connected with the throat section (10) and has the same diameter as the throat section (10), the other end of the diffusion pipe section (7) has the same diameter as the inlet end of the tapered pipe section (5) and extends into the secondary air box (6), the length of the diffusion pipe section is 300-800mm, and the outlet end of the diffusion pipe section (7) is connected with the straight pipe section.
10. The injection type fire detection air cooling device as claimed in claim 1 or 2, wherein the primary hot air enters the primary fire detection cooling air main pipe from the primary hot air main pipe, and is distributed to each primary hot air inlet pipe section from the primary fire detection cooling air main pipe, and the primary fire detection cooling air main pipe has a diameter of 240-260 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011359335.4A CN112432202B (en) | 2020-11-27 | 2020-11-27 | Injection type fire detection air cooling device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011359335.4A CN112432202B (en) | 2020-11-27 | 2020-11-27 | Injection type fire detection air cooling device |
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| CN112432202A true CN112432202A (en) | 2021-03-02 |
| CN112432202B CN112432202B (en) | 2022-12-06 |
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| CN202011359335.4A Active CN112432202B (en) | 2020-11-27 | 2020-11-27 | Injection type fire detection air cooling device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114320338A (en) * | 2021-12-29 | 2022-04-12 | 中冶南方城市建设工程技术有限公司 | Pipeline non-excavation pneumatic dumping system and working method thereof |
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| JPH0960818A (en) * | 1995-08-28 | 1997-03-04 | Noritz Corp | Spray combustor |
| CN2890657Y (en) * | 2006-03-08 | 2007-04-18 | 顾向涛 | Heat storage type pulse burning nozzle |
| CN201269528Y (en) * | 2008-09-19 | 2009-07-08 | 武汉宇宙科技有限公司 | Heater of bell type annealing furnace |
| CN202692123U (en) * | 2012-07-20 | 2013-01-23 | 甘肃大唐国际连城发电有限责任公司 | Flame detecting system of thermal power plant |
| CN203036674U (en) * | 2012-12-12 | 2013-07-03 | 华润电力登封有限公司 | Redundant pipeline device |
| CN107941030A (en) * | 2017-12-21 | 2018-04-20 | 中冶焦耐(大连)工程技术有限公司 | A kind of First air ejection structure and technique for handling rotary kiln exhaust device |
| CN208794444U (en) * | 2018-09-15 | 2019-04-26 | 辽宁大唐国际沈东热电有限责任公司 | A kind of power plant boiler fire detecting probe cooling device |
-
2020
- 2020-11-27 CN CN202011359335.4A patent/CN112432202B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0960818A (en) * | 1995-08-28 | 1997-03-04 | Noritz Corp | Spray combustor |
| CN2890657Y (en) * | 2006-03-08 | 2007-04-18 | 顾向涛 | Heat storage type pulse burning nozzle |
| CN201269528Y (en) * | 2008-09-19 | 2009-07-08 | 武汉宇宙科技有限公司 | Heater of bell type annealing furnace |
| CN202692123U (en) * | 2012-07-20 | 2013-01-23 | 甘肃大唐国际连城发电有限责任公司 | Flame detecting system of thermal power plant |
| CN203036674U (en) * | 2012-12-12 | 2013-07-03 | 华润电力登封有限公司 | Redundant pipeline device |
| CN107941030A (en) * | 2017-12-21 | 2018-04-20 | 中冶焦耐(大连)工程技术有限公司 | A kind of First air ejection structure and technique for handling rotary kiln exhaust device |
| CN208794444U (en) * | 2018-09-15 | 2019-04-26 | 辽宁大唐国际沈东热电有限责任公司 | A kind of power plant boiler fire detecting probe cooling device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114320338A (en) * | 2021-12-29 | 2022-04-12 | 中冶南方城市建设工程技术有限公司 | Pipeline non-excavation pneumatic dumping system and working method thereof |
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| CN112432202B (en) | 2022-12-06 |
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