CN114251673A - Overlength natural gas ignition gun of multi-fuel boiler and ignition method thereof - Google Patents
Overlength natural gas ignition gun of multi-fuel boiler and ignition method thereof Download PDFInfo
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- CN114251673A CN114251673A CN202010996034.6A CN202010996034A CN114251673A CN 114251673 A CN114251673 A CN 114251673A CN 202010996034 A CN202010996034 A CN 202010996034A CN 114251673 A CN114251673 A CN 114251673A
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- natural gas
- ignition
- boiler
- electrode
- burning torch
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23Q—IGNITION; EXTINGUISHING-DEVICES
- F23Q3/00—Igniters using electrically-produced sparks
- F23Q3/008—Structurally associated with fluid-fuel burners
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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
- F23M11/045—Means for supervising combustion, e.g. windows by observing the flame
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23Q—IGNITION; EXTINGUISHING-DEVICES
- F23Q21/00—Devices for effecting ignition from a remote location
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23Q—IGNITION; EXTINGUISHING-DEVICES
- F23Q25/00—Extinguishing-devices, e.g. for blowing-out or snuffing candle flames
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Combustion (AREA)
Abstract
The utility model provides a multiple fuel boiler's overlength natural gas burning torch, includes burning torch protective case, wears to locate the intraductal firearm of burning torch protective case, flame monitor and natural gas feed pipe, and burning torch protective case is equipped with flange outward, and the firearm rear end is equipped with the drive firearm advancing device at the intraductal axial displacement of burning torch protective case, and the firearm includes that the outside-in sets gradually outer pipe of electrode, electrode protection tube, electrode insulation layer and electrode, and the electrode is located one section of firearm front end, has connect high temperature resistant cable afterwards. The invention also discloses an ignition method of the overlength natural gas ignition gun of the multi-fuel boiler. The invention adopts natural gas ignition, can effectively improve the successful probability of ignition, and has the advantages of convenient installation, good insulation, safety, reliability, natural gas deflagration prevention and the like.
Description
Technical Field
The invention relates to an ignition gun, in particular to an overlong natural gas ignition gun of a multi-fuel boiler and an ignition method thereof.
Background
Some power plants (especially power plants in steel plants) have more boiler fuel media, complicated burners and longer arrangement structure, so that the length of the matched ignition gun is about 5.5 meters. At present, a light oil ignition gun is commonly used and is integrated with a flame detection and ignition gun. In the actual use process, the oil ignition gun mainly has the following problems:
the ignition is electronic ignition, the ignition energy is small, and the ignition is very difficult due to the difficult stability of flame because the disturbance of combustion air of the spiral-flow type combustors of the front and rear wall boilers of the power station is large and complex and the ignition spark is too small. And because the length of the ignition gun is more than 5 meters, the ignition transformer is 5000V high voltage, and the metal ignition rod is designed to be exposed in the air, the 5 meter long ignition rod is basically exposed, and the periphery is very crowded metal parts, the electric leakage and the electric conduction are very easy to occur under high voltage, so that the ignition failure is caused.
The fire detection of ignition flame is ion fire detection, the voltage of the ion fire detection is generally 500-600VDC, whether the flame exists or not is detected according to the conductivity of the flame, but the ion detection rod with the length of 5 meters is basically exposed outside, the periphery of the ion detection rod is a very crowded metal part, the current of the ion detection is microampere current which is very small, and the electric leakage or the electric conduction is slight, so that the failure of the fire detection is easily caused.
Existing ignition oil gun adopts air atomization, and very little flow leads to the atomizing hole very little, and because main burner is long, ignition oil gun must design more than 5 meters, and so long rifle, the flow is very little again, and the atomizing is very difficult, and oil gun sweeps and hardly blows clean remaining greasy dirt, and the residual oil becomes burnt after the furnace radiates, blocks up the atomizing hole very easily, leads to the atomizing bad, is difficult to light. And the oil ignition gun is easy to generate coking faults, and the oil ignition gun must be cleaned and blown in time to keep clean and dry.
In the actual production process, because above-mentioned defect such as burning torch lectotype, the coking of often taking place blocks up, unable normal ignition because oil gun length is longer, can't thoroughly clean up, vicious circle causes drawbacks such as unit operation difficulty, maintenance time length to influence the normal production of power plant, bring harmful effects for boiler operation, the main influence is as follows:
when the boiler is started, the light oil igniter cannot be reliably ignited, the ignition fails, fuel is easy to accumulate, the ignition fails to start according to the operation regulations, all fuel must be cut off, the whole chamber is purged and re-ignited, and the ignition can be realized only by multiple times of ignition, so that the ignition and the starting of the unit are very difficult each time. During the boiler normal operating, when throwing the combustor, also meet the unable problem of lighting of light oil burning torch equally, if burning torch flame is unusual, main combustor can't be put into operation, just can't satisfy the requirement of the timely adjustment of unit load.
Secondly, some boiler ignition systems in the power plant have automatic control and safety interlocking functions, but due to reasons such as ignition gun coking and flame detection faults, automatic ignition cannot be realized, and only needs to manually judge whether conditions such as air distribution, oil pressure and atomization simultaneously meet requirements or not, and manually realize ignition.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an ultra-long natural gas ignition gun of a multi-fuel boiler and an ignition method thereof, which can avoid exposure in air and improve the successful probability of ignition.
The invention discloses an ultra-long natural gas ignition gun of a multi-fuel boiler, which comprises the following steps:
on the one hand, a multiple fuel boiler's overlength natural gas burning torch, including burning torch protective case, wear to locate the firearm in the burning torch protective case, flame monitor and natural gas feed pipe, burning torch protective case is equipped with flange outward, and the firearm rear end is equipped with the drive firearm advancing device of axial displacement in burning torch protective case, and the firearm includes outer pipe of the electrode, electrode protection pipe, electrode insulation layer and the electrode that outside-in set gradually, and the electrode is located one section of firearm front end, has connect high temperature resistant cable afterwards.
The flame monitor adopts an optical fiber type flame monitor, and comprises a monitor outer guide pipe, a monitor outer protection pipe and monitor optical fibers which are sequentially arranged from outside to inside.
The igniter and the flame monitor are arranged on the upper part in the ignition gun protective sleeve side by side, the natural gas feed pipe is arranged on the lower part in the ignition gun protective sleeve, and the side wall of the rear end of the ignition gun protective sleeve is provided with a combustion-supporting cooling air distribution input pipe communicated with the ignition gun protective sleeve.
The propelling device comprises a cylinder and a connecting frame which is arranged on a piston rod of the cylinder and is connected with the rear end of the igniter.
The propelling device also comprises an igniter limit guide rail and an igniter limit switch arranged on the igniter limit guide rail.
The protective sleeve of the ignition gun, the outer guide tube of the electrode and the outer guide tube of the monitor are all designed into corresponding three-section structures, the first section is a hard stainless steel tube, the second section is a flexible stainless steel tube, the rest is a hard stainless steel tube, and the three sections are connected through welding.
The electrode insulating layer is made of ceramic materials, and the high-temperature-resistant cable is made of glass fiber materials.
In another aspect, a method for igniting an ultra-long natural gas burning torch for a multifuel boiler includes the steps of:
a. confirming that the boiler starting ignition condition is met;
b. pre-purging nitrogen gas from the natural gas feed pipe;
c. the propelling device drives the igniter to stretch into place, and an air supply valve of the natural gas feeding pipe is opened to feed natural gas and ignite;
d. after the flame is detected by the flame monitor, the igniter is driven to reset by the propelling device.
Further comprising a flameout step e: and after the gas supply valve of the natural gas feeding pipe is closed, purging nitrogen gas for the natural gas feeding pipe.
The condition of meeting the boiler starting ignition condition in the step a is as follows:
opening a natural gas feeding main valve; the boiler has no stop command; the cooling air for ignition is normal; adjusting the natural gas to a required pressure; the total air flow of the boiler reaches the standard.
The overlength natural gas ignition gun of the multi-fuel boiler has the following advantages:
1. the ignition gun is provided with a propelling device, when the ignition gun is ignited, an electrode of a driving igniter extends into an ignition fuel area for ignition, and when the ignition is finished, the electrode is retracted so as to ensure the service life of the ignition gun;
2. the overlength natural gas burning torch is installed with a torch protective sleeve, and the front part is provided with a section of flexible stainless steel pipe, which is convenient for installation and adjustment in the existing space of a small boiler;
3. the glass fiber is adopted as the high-temperature-resistant cable, so that the insulation is good, and the short circuit is prevented;
4. the ceramic is adopted as the electrode insulating layer, so that the insulation is good, the safety and the reliability are realized, and the electrode is not exposed;
5. introducing a purging procedure, namely purging to remove oxygen in the pipeline before ignition; blow down the back and sweep in order to get rid of the natural gas in the pipeline, can effectively prevent the natural gas detonation.
Drawings
Fig. 1 is a schematic structural view of an ultra-long natural gas burning torch according to the present invention;
FIG. 2 is a schematic cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a schematic structural view of the igniter of the invention;
FIG. 4 is a schematic diagram of a flame monitor according to the present invention.
In the figure:
the device comprises an ignition gun protective sleeve 1, an igniter 2, a flame monitor 3, a natural gas feed pipe 4, a connecting flange 5, a combustion-supporting cooling air distribution input pipe 6, an access port 41 of the natural gas feed pipe, a cylinder 7, a connecting frame 8, an igniter limit switch 9, an igniter limit guide rail 10, an electrode outer guide pipe 21, an electrode protection pipe 22, an electrode insulating layer 23, an electrode 24, a first junction box 25, a monitor outer guide pipe 31, a monitor outer protection pipe 32, a monitor optical fiber 33 and a second junction box 34.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples.
As shown in fig. 1 to 4, the overlength natural gas burning torch of the multiple fuel boiler of the present invention specifically includes a burning torch protective sleeve 1, a fire maker 2 penetrating the burning torch protective sleeve 1, a flame monitor 3 and a natural gas supply pipe 4, wherein a connecting flange 5 is arranged outside the burning torch protective sleeve 1, so that the burning torch can be conveniently installed, disassembled and replaced; the rear end of the igniter 2 is provided with a propelling device for driving the igniter 2 to axially move in the ignition gun protective sleeve 1, the igniter 2 comprises an outer electrode guide tube 21, an outer electrode protective tube 22, an electrode insulating layer 23 and an electrode 24 which are sequentially arranged from outside to inside, wherein the outer electrode guide tube 21 and the outer electrode protective tube 22 are made of stainless steel materials respectively, the electrode insulating layer 23 is made of ceramic materials, and the electrode 24 is wrapped by the electrode and then has the advantages of good insulation, safety, reliability, no exposure of the electrode 24 and the like. The electrode 24 is located at one section of the front end of the igniter 2, the length of the electrode is about 1 meter, and the electrode is connected to a first terminal box 25 at the tail end through a high-temperature-resistant cable (not shown in the figure), the high-temperature cable is made of glass fiber materials, is good in insulation and short-circuit prevention, and can meet the requirement of supplying power to the electrode 24 of the ultralong ignition gun.
The invention adopts the igniter 2 with high power, and the ignition voltage is as follows: 2000VDC, ignition frequency: 8 ~ 12PPS, can guarantee that the homoenergetic reliably ignites under various loads, and can not blown out by furnace's wind and main fuel.
As an embodiment, the flame monitor 3 is an optical fiber type flame monitor, and includes an outer monitor guide tube 31, an outer monitor protection tube 32, and an optical monitor fiber 33, which are sequentially disposed from outside to inside, wherein the outer monitor guide tube 31 and the outer monitor protection tube 32 are both made of stainless steel, and a flame signal can be output by guiding the flame optical signal to a second junction box 34 which is 5 meters away or more through a high-sensitivity optical fiber, so as to correctly reflect the combustion condition of the flame.
As an embodiment, the igniter 2 and the flame monitor 3 are arranged side by side at an upper portion in the protective sleeve 1 of the ignition gun, the natural gas feed pipe 4 is arranged at a lower portion in the protective sleeve 1 of the ignition gun, and a combustion-supporting cooling air distribution inlet pipe 6 is arranged on a rear end side wall of the protective sleeve 1 of the ignition gun and is communicated with the protective sleeve of the ignition gun to distribute air for combustion supporting and cooling in the protective sleeve of the ignition gun (an inner space b in fig. 2). The inlet 41 of the natural gas feeding pipe 4 is also arranged on the side wall of the rear end of the ignition gun protective sleeve 1 and is positioned at the rear side of the air distribution input pipe 6 for combustion-supporting cooling, and the inlet 41 can be respectively connected with the gas supply valve and the purging valve through a tee joint and is respectively used for purging natural gas and nitrogen.
As an embodiment, the protective sleeve 1 of the ignition gun, the outer electrode guide tube 21 and the outer monitor guide tube 31 are all designed into corresponding three-section structures, the first section (about half a meter) is a hard stainless steel tube, the second section (about one meter) is a flexible stainless steel tube (a in the figure), and the rest is also a hard stainless steel tube, and the three sections are connected by welding. The positions of the flexible stainless steel pipes of the ignition gun protective sleeve 1, the electrode outer guide pipe 21 and the monitor outer guide pipe 31 are consistent. By adopting the flexible stainless steel pipe, the flexible stainless steel pipe can conveniently penetrate through an overlong channel during installation, and is beneficial to installation.
As an embodiment, the propelling device comprises a cylinder 7 and a connecting frame 8 which is arranged on a piston rod of the cylinder and is connected with the rear end of the igniter 2, and the connecting frame 8 drives the igniter 2 to move axially in the ignition gun protective sleeve 1 by the piston motion of the cylinder 7.
In addition, the propelling device further comprises an igniter limit guide rail 10 and an igniter limit switch 9 arranged on the igniter limit guide rail 10, and the igniter limit switch is used for detecting the resetting of the igniter 2.
The ignition method of the ignition gun of the invention is that before the fuels are blast furnace gas (main fuel), coke oven gas (auxiliary fuel), natural gas and light oil, the ignition gun must be ignited firstly, then a burner valve is opened, and after the burner is ignited, a control program sends out an ignition gun flameout instruction, and the specific steps are as follows:
1. ignition conditions are as follows: opening a natural gas main valve for ignition;
the boiler has no stop command;
the cooling air for ignition is normal;
adjusting the natural gas to a required pressure;
the total air flow of the boiler reaches the standard;
ignition can be carried out after the conditions are met;
2. ignition program control: inputting nitrogen into the natural gas feeding pipe through a tee joint for pre-purging for about 10 seconds;
closing the purging valve and actuating a limit switch;
the electrode for igniting the ignition gun is extended into place;
opening an air supply valve of a natural gas supply pipe for the ignition gun in place;
a flame detector on the ignition gun detects a flame;
the electrode ignited by the ignition gun is withdrawn and reset;
the ignition gun keeps flame, and the ignition program control is finished;
3. and (4) extinguishing program control: closing an air supply valve of a natural gas supply pipe for the ignition gun in place;
the purging valve is opened in place, and nitrogen is input into the natural gas feeding pipe for purging for about 20 seconds;
the purging valve is closed in place;
and (5) stopping the flameout program control.
In conclusion, compared with the traditional light oil ignition, the overlength natural gas ignition gun for the multi-fuel boiler and the ignition method thereof adopt natural gas ignition, have no various problems of light oil ignition, can greatly improve the successful probability of ignition, ensure the service life of the ignition gun and have obvious effect.
However, those skilled in the art should realize that the above embodiments are illustrative only and not limiting to the present invention, and that changes and modifications to the above described embodiments are intended to fall within the scope of the appended claims, provided they fall within the true spirit of the present invention.
Claims (10)
1. The utility model provides a overlength natural gas burning torch of multiple fuel boiler which characterized in that: including ignition gun protective case, wear to locate firearm, flame monitor and the natural gas feed pipe in the ignition gun protective case, ignition gun protective case outside of tubes is equipped with flange, and the firearm rear end is equipped with the advancing device of drive firearm axial displacement in ignition gun protective case, and the firearm includes outer pipe of the electrode, electrode protection pipe, electrode insulation layer and the electrode that outside-in set gradually, and the electrode is located one section of firearm front end, has connect high temperature resistant cable afterwards.
2. The overlength natural gas burning torch for a multifuel boiler as claimed in claim 1, wherein: the flame monitor adopts an optical fiber type flame monitor, and comprises a monitor outer guide pipe, a monitor outer protection pipe and monitor optical fibers which are sequentially arranged from outside to inside.
3. The overlength natural gas burning torch for a multifuel boiler as claimed in claim 1 or 2, wherein: the igniter and the flame monitor are arranged on the upper part in the ignition gun protective sleeve side by side, the natural gas feed pipe is arranged on the lower part in the ignition gun protective sleeve, and the side wall of the rear end of the ignition gun protective sleeve is provided with a combustion-supporting cooling air distribution input pipe communicated with the ignition gun protective sleeve.
4. The overlength natural gas burning torch for a multifuel boiler as claimed in claim 1, wherein: the propelling device comprises a cylinder and a connecting frame which is arranged on a piston rod of the cylinder and is connected with the rear end of the igniter.
5. The overlength natural gas burning torch for a multifuel boiler as claimed in claim 4, wherein: the propelling device also comprises an igniter limit guide rail and an igniter limit switch arranged on the igniter limit guide rail.
6. The overlength natural gas burning torch for a multifuel boiler as claimed in claim 3, wherein: the protective sleeve of the ignition gun, the outer guide tube of the electrode and the outer guide tube of the monitor are all designed into corresponding three-section structures, the first section is a hard stainless steel tube, the second section is a flexible stainless steel tube, the rest is a hard stainless steel tube, and the three sections are connected through welding.
7. The overlength natural gas burning torch for a multifuel boiler as claimed in claim 1, wherein: the electrode insulating layer is made of ceramic materials, and the high-temperature-resistant cable is made of glass fiber materials.
8. The method of igniting an ultra-long natural gas burning torch for a multifuel boiler as claimed in claim 1, comprising the steps of:
a. confirming that the boiler starting ignition condition is met;
b. pre-purging nitrogen gas from the natural gas feed pipe;
c. the propelling device drives the igniter to stretch into place, and an air supply valve of the natural gas feeding pipe is opened to feed natural gas and ignite;
d. after the flame is detected by the flame monitor, the igniter is driven to reset by the propelling device.
9. The method of claim 8, further comprising the step of extinguishing e: and after the gas supply valve of the natural gas feeding pipe is closed, purging nitrogen gas for the natural gas feeding pipe.
10. The ignition method of an ultra-long natural gas burning torch for a multifuel boiler as claimed in claim 8, wherein the conditions for satisfying the boiler start-up ignition in step a are:
opening a natural gas feeding main valve; the boiler has no stop command; the cooling air for ignition is normal; adjusting the natural gas to a required pressure; the total air flow of the boiler reaches the standard.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010996034.6A CN114251673A (en) | 2020-09-21 | 2020-09-21 | Overlength natural gas ignition gun of multi-fuel boiler and ignition method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010996034.6A CN114251673A (en) | 2020-09-21 | 2020-09-21 | Overlength natural gas ignition gun of multi-fuel boiler and ignition method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114251673A true CN114251673A (en) | 2022-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010996034.6A Pending CN114251673A (en) | 2020-09-21 | 2020-09-21 | Overlength natural gas ignition gun of multi-fuel boiler and ignition method thereof |
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| CN (1) | CN114251673A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2581819Y (en) * | 2002-11-28 | 2003-10-22 | 江阴市石油化工设备有限公司 | Electronic ignition altar lamp which burns day and night |
| CN101576313A (en) * | 2008-05-07 | 2009-11-11 | 中冶焦耐自动化系统有限公司 | Method for controlling automatic ignition of tube furnace |
| CN201437991U (en) * | 2009-07-16 | 2010-04-14 | 湖南吉祥石化科技股份有限公司 | Multi-functional automatic safe igniter for combustors |
| CN203375454U (en) * | 2013-03-15 | 2014-01-01 | 洛阳新普石化设备开发有限公司 | Intelligent ignition integrated everlasting lamp |
| CN205026729U (en) * | 2015-09-30 | 2016-02-10 | 西安航天源动力工程有限公司 | Automatic ignite and anger and examine device |
| CN205332219U (en) * | 2015-11-24 | 2016-06-22 | 西安航天源动力工程有限公司 | Take formula of mixing in advance that optic fibre fire examined nozzle that goes into operation of igniteing |
| CN207762892U (en) * | 2017-12-21 | 2018-08-24 | 靖江博鑫柯曼燃烧器制造有限公司 | Integration goes into operation igniter burner automatic ignition device |
| CN210511658U (en) * | 2019-07-26 | 2020-05-12 | 中节能（沧州）环保能源有限公司 | Combustion-supporting device of boiler |
-
2020
- 2020-09-21 CN CN202010996034.6A patent/CN114251673A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2581819Y (en) * | 2002-11-28 | 2003-10-22 | 江阴市石油化工设备有限公司 | Electronic ignition altar lamp which burns day and night |
| CN101576313A (en) * | 2008-05-07 | 2009-11-11 | 中冶焦耐自动化系统有限公司 | Method for controlling automatic ignition of tube furnace |
| CN201437991U (en) * | 2009-07-16 | 2010-04-14 | 湖南吉祥石化科技股份有限公司 | Multi-functional automatic safe igniter for combustors |
| CN203375454U (en) * | 2013-03-15 | 2014-01-01 | 洛阳新普石化设备开发有限公司 | Intelligent ignition integrated everlasting lamp |
| CN205026729U (en) * | 2015-09-30 | 2016-02-10 | 西安航天源动力工程有限公司 | Automatic ignite and anger and examine device |
| CN205332219U (en) * | 2015-11-24 | 2016-06-22 | 西安航天源动力工程有限公司 | Take formula of mixing in advance that optic fibre fire examined nozzle that goes into operation of igniteing |
| CN207762892U (en) * | 2017-12-21 | 2018-08-24 | 靖江博鑫柯曼燃烧器制造有限公司 | Integration goes into operation igniter burner automatic ignition device |
| CN210511658U (en) * | 2019-07-26 | 2020-05-12 | 中节能（沧州）环保能源有限公司 | Combustion-supporting device of boiler |
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