CN1167899C - Combustion control system - Google Patents
Combustion control system Download PDFInfo
- Publication number
- CN1167899C CN1167899C CNB961218894A CN96121889A CN1167899C CN 1167899 C CN1167899 C CN 1167899C CN B961218894 A CNB961218894 A CN B961218894A CN 96121889 A CN96121889 A CN 96121889A CN 1167899 C CN1167899 C CN 1167899C
- Authority
- CN
- China
- Prior art keywords
- combustion
- flow velocity
- control system
- catching fire
- state
- 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.)
- Expired - Fee Related
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
- F23N5/184—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using electronic means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
- F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electronic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2227/00—Ignition or checking
- F23N2227/36—Spark ignition, e.g. by means of a high voltage
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/20—Systems for controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Regulation And Control Of Combustion (AREA)
- Measuring Volume Flow (AREA)
- Control Of Combustion (AREA)
Abstract
A prior art combustion control system fails to accurately detect firing by deterioration of an ultraviolet sensor and to decide a suitable maintenance/checking timing. According to a combustion control system of the present invention, a flow velocity detector detects a flow velocity of a combustion air or a fuel gas supplied into a combustion chamber and a combustion controller decides whether a firing state is normal or abnormal on the basis of a decelerated state of the flow velocity detected by the flow velocity detector upon ignition operation of the combustion chamber.
Description
The present invention relates to control and be used in water heater, the combustion control system of burners such as boiler.
Fig. 9 represents the combustion control system structure of prior art, wherein label 1 expression firing chamber; The 2nd, the gas that combustion air and inflammable gas are mixed is sent the Gas Pipe of firing chamber 1 to; The 3rd, burner; The 4th, to the transformer of spark plug 5 power supplies; The 6th, from the flame of burner 3 ejections; The 7th, with the Ultraviolet sensor of UV detection flame 6; The 8th, the combustion controller of control burning, its, just allows to continue firing if the state of catching fire is normal certainly according to the result who is detected the state that catches fire by Ultraviolet sensor 7 when the ignition operation, otherwise, just stop the process of firing.
The work of the combustion control system of prior art is as described below.
The structure of the combustion control system of prior art is with UV sensor 7 flame detection 6 when the ignition operation of burner 3, and judge according to the result that Ultraviolet sensor 7 detects whether fired state is normal with combustion controller 8, if the state of catching fire is normal certainly, just allow to continue firing, otherwise, just cut off the supply of combustion air and inflammable gas, stop the process of firing.
Combustion control system with prior art of above-mentioned structure has a shortcoming, is exactly that UV sensor 7 is placed near the flame in the firing chamber, easily owing to change slowly, pollutes or the like performance and runs down.Therefore reduced the detected signal amount of flame, made it to be difficult to accurately detect tangible igniting, the result is directed at the erroneous judgement of catching fire normally is undesired catching fire.
In the combustion control system of prior art, detecting device only detects the part flame of burner, for example, replaces Ultraviolet sensor with the flame measuring staff sometimes.But the flame measuring staff has another shortcoming, even have only some flare in burning near it, it also exports the detection signal, so can not detect so undesired state that catches fire, causes loss of ignition.
The combustion control system of prior art also has a shortcoming, it can not be measured from the time delay that begins to light a fire to catching fire, when burner and spark plug make this time elongated owing to changing slowly to worsen, just can not determine suitable time to burner and spark plug maintenance/verification, thereby, burner that those performances have worsened and spark plug are also in interrupted use, and perhaps on the contrary, burner and spark plug that those are also handy but change.
The present invention will solve the aforesaid drawbacks, and the purpose of this invention is to provide such combustion control system, and whether it can accurately detect the state of catching fire normal, and determines suitable maintenance/checking time.
Feature according to the combustion control system of the first string of the present invention is that a flow rate detection device is arranged, detection supplies to the combustion air of firing chamber or the flow velocity of inflammable gas, with a combustion controller, detect the flow velocity down state when the ignition operation of firing chamber according to the flow rate detection device and judge whether the state that catches fire is normal.
According to the feature of the combustion control system of second scheme of the present invention is that combustion controller just judges that the state of catching fire is normal state if the flow velocity of combustion air or inflammable gas eases down to the number of appointment or lower.
According to the feature of the combustion control system of the 3rd scheme of the present invention is that combustion controller is measured from the flow velocity of begin to light a fire combustion air or inflammable gas and lowered the used time, if the time of measuring arrives predetermined numerical value or more some more, just judge that the state of catching fire is an abnormal state of affairs.
Feature according to the combustion control system of the 4th scheme of the present invention is that the flow rate detection device is a pneumatic sensor that uses a miniature current velocity sensing chip.Wherein on silicon chip, have heating and temperature sensing component.
Fig. 1 is a structure block scheme, expression combustion control system according to a first embodiment of the invention;
Fig. 2 is the method that the setting value of normally catching fire (absolute value) made in explanation;
Fig. 3 is the method that the setting value of normally catching fire (relative value) made in explanation;
Fig. 4 is that the setting value of normally the catching fire method of (time) is made in explanation;
Fig. 5 is a process flow diagram, and expression is according to the operation of the combustion controller of second embodiment of the present invention;
Fig. 6 is a structure block diagram, and expression is according to the pneumatic sensor of the 3rd embodiment of the present invention;
Fig. 7 is a planimetric map, represents the details of miniature air-flow sensing chip;
Fig. 8 (a) is a performance plot, the flow velocity output when differential pressure transducer is used in expression as the flow rate detection device, and Fig. 8 (b) is a performance plot, the flow velocity output when pneumatic sensor is used in expression as the flow rate detection device;
Fig. 9 is a structure block scheme, the combustion control system of expression prior art.
The embodiment that the present invention recommends below is described.
Embodiment 1
Fig. 1 is a structure block scheme, expression combustion control system according to a first embodiment of the invention, wherein label 1 expression firing chamber; The 2nd, the gas that combustion air and inflammable gas are mixed is sent the Gas Pipe of firing chamber 1 to; The 3rd, burner; The 4th, to the transformer of spark plug 5 power supplies; The 6th, from the flame of burner 3 ejections; The 8th, the controller of control burning; The 11st, as the pneumatic sensor of flow rate detection device, detect and deliver to the combustion air of firing chamber 1 or the flow velocity of inflammable gas.If pneumatic sensor 11 detects combustion and helps the flow velocity of air or inflammable gas to ease down to the numerical value of appointment or lower when ignition operation, combustion controller 8 just judges that the state of catching fire is normal, and permission firing chamber 1 relaying afterflame; If above-mentioned flow velocity does not ease down to the numerical value of appointment or lower, combustion controller 8 just judges that the state of catching fire is abnormal, and is firing process in the burn-out chamber 1.
The operation of combustion control system is as described below in the present embodiment.
Fig. 2 is the method that the setting value of normally catching fire (absolute value) made in explanation.Show among the figure and normally firing state that the mixed gas in the burner 3 is ignited by spark plug 5 and caught fire after ignition operation begins.Under this condition, because the blast of mixed gas, a pulsating wave arrives upstream one side of Gas Pipe, and pneumatic sensor 11 just detects the state that flow velocity sharply lowers.
In method shown in Figure 2,, in combustion controller 8, set rapid flow velocity upper limit lmax and the lower flow rate limit lmin that lowers of flow velocity that starting ignition operation back produces according to the distinctive flow speed characteristic of combustion control system.If pneumatic detector 11 detected flow velocitys are in flow velocity upper limit lmax and lower flow rate limit lmin scope, combustion controller 8 just judges that the state of catching fire is normal, and allows to burn away; If pneumatic detector 11 detected flow velocitys are not in flow velocity upper limit lmax and lower flow rate limit lmin scope, combustion controller 8 judges that the state of catching fire is abnormal and exports the requirement of a maintenance/verification signal and safeguard/verification firing operation.
Fig. 3 is the method that the setting value of normally catching fire (relative value) made in explanation.In illustrated method, set the rapid reduced amounts l that produces when normally catching fire in the combustion controller 8 and be expressed as constant, flow velocity upper limit lmax=la-L1 and the lower flow rate limit lmin=la-L2 (flow velocity when la is the starting ignition operation, L1, L2 is the amount of appointment), if pneumatic detector 11 detected flow velocitys are in flow velocity upper limit lmax and lower flow rate limit lmin scope, combustion controller 8 just judges that the state of catching fire is normal, and allows to burn away; If pneumatic detector 11 detected flow velocitys are not in flow velocity upper limit lmax and lower flow rate limit lmin scope, combustion controller 8 judges that the state of catching fire is abnormal and exports the requirement of a maintenance/verification signal and safeguard/verification firing operation.
According to above-mentioned present embodiment, judge that it is that the pneumatic sensor 11 that basis is contained in the Gas Pipe 2 detects the combustion air of supply firing chamber 1 or the flow velocity of inflammable gas that burner 3 normally catches fire, therefore pneumatic sensor 11 do not need to be contained in flame 6 near, thereby just avoided deterioration.As a result, pneumatic sensor 11 detection that can correctly realize catching fire.
First embodiment is also advantageous in that can distinguish part lights and light fully, ease down to according to flow velocity to judge just in the scope of regulation that the state of catching fire is normal because be, thereby avoid lighting failure, and, when abnormal catching fire, even if because big firing makes the increase of flow velocity reduced amounts also can check out.
Though pneumatic sensor 11 is contained in the Gas Pipe 2 in the present embodiment, also can be contained in the combustion-aid air pipe or be contained near the firing chamber 1, if it is a side that can also be contained in exhaust of making of erosion resistant.
Fig. 4 is that the setting value of normally the catching fire method of (time) is made in explanation.In illustrated method, warning setting-up time t1 is set in the combustion controller 8 stops setting-up time t2 with firing.Combustion controller 8 will be from the starting ignition to the pneumatic sensor 11 detectedly once sharply lowers (when producing when normally catching fire) used time tx and warning setting-up time t1 and is firing and stop setting-up time t2 relatively, and output warning or stop the process of firing.
The operation of combustion control system is as described below in the present embodiment.
Fig. 5 is a process flow diagram, the operation of the combustion controller 8 of expression present embodiment.Combustion controller 8 receives the starting ignition time (step ST1) of spark plug 5, also receive the time point (step ST2) that when the ignition operation detected air-flow sharply lowers l, calculate and sharply lower the used time tx (step ST3) of l to detecting air-flow from starting ignition from pneumatic sensor 11.The warning setting-up time t1 that combustion controller 8 is also made with time tx with at step ST4 and firing and stop setting-up time t2 relatively (step ST5).Before if time tx is firing again after warning setting-up time t1 and is stopping setting-up time t2, combustion controller 8 judges that the states of catching fire are abnormal but have satisfied and catch fire, and allow to continue firing, judge that again burner 3 and spark plug 5 need maintenance/verification simultaneously, and give a warning.Stop setting-up time t2 and pneumatic sensor 11 to firing and still not detecting air-flow when stopping setting-up time t2 and sharply lower l if time tx surpasses to fire, combustion controller 8 also stops ignition operation (step ST6).
According to above-mentioned present embodiment, it can and fire time tx and predetermined warning setting-up time t1 and stop setting-up time t2 and judge that relatively the state of catching fire is undesired catching fire, output warning thereupon, maintenance/checking time that the notifying operation person is suitable, or stop the process of firing.
Also have, in the present embodiment, firing that to stop setting-up time t2 essential highly reliable, suggestion is set with electric capacity and resistance composition discharge circuit; Warning setting-up time t1 is used for judging suitable maintenance/checking time, does not need to stop high reliability the setting-up time t2 as firing, and can timer be set with microcomputer software.
Embodiment 3
Fig. 6 is a structure block diagram, and expression is according to the pneumatic sensor of the 3rd embodiment, and wherein label 2a represents to be contained in the plate that air hole is arranged in the Gas Pipe 2; The 11st, pneumatic sensor; The 12nd, as the miniature air-flow sensing chip of detecting element.
Fig. 7 is a planimetric map, represents the details of miniature air-flow sensing chip 12, wherein label 12 expression silicon chips; 12b is a heater block; 12c is upstream one side temperature sensor parts (temperature sensor parts); 12d is downstream one a side temperature sensor (temperature sensor parts).Also have, electrode is partly represented in blacking.
The operation of combustion control system is as described below among the 3rd embodiment.
Imagination pneumatic sensor 11 is to be used in to be exposed to dust, and oil smoke in the environment such as steam, has and captures the dust penetrate in the pneumatic sensor 11, oil smoke, the capture member of things such as steam, thereby the miniature air-flow sensing chip 12 of protection evil.In a word, thus the ability of having improved sensor 11 opposing rugged surroundings prevents its characteristic variations.
Secondly, the detection principle as the miniature air-flow sensing chip 12 of detecting element is described in detail as follows with reference to Fig. 7.The combustion air of bringing in the air flue and inflammable gas contact and are heated with heater block 12b on the silicon chip 12a, and the combustion air before and after the heating and the temperature of inflammable gas are detected by upstream one side temperature sensor 12c and downstream one side temperature sensor 12d respectively.Then, the temperature difference before and after combustion air and the inflammable gas heating is converted to electric signal output, so just detects combustion air and inflammable gas flow velocity separately.
Fig. 8 (a) is a performance plot, the flow velocity output when differential pressure transducer is used in expression as the flow rate detection device; Fig. 8 (b) is a performance plot, the flow velocity output when pneumatic sensor is used in expression as the flow rate detection device.
From these figure, see, pneumatic sensor can detect the peak value of air-flow pulse when catching fire than differential pressure pickup with higher sensitivity, so shown in first and second embodiment, pneumatic sensor is than the more suitable air-flow pulse that detects the high speed variation of differential pressure pickup.
In the present embodiment, the pneumatic sensor 11 that is used as the flow rate detection device can lean on capture structure to capture the dust that penetrates wherein, oil smoke, and steam etc., so it can protect miniature air-flow sensing chip 12 to detect accurately.In addition, pneumatic sensor 11 can detect the peak value of air-flow pulse when catching fire with high sensitivity speed and high reliability.
Though pneumatic sensor 11 is used for detecting flow velocity in the first, the second and the 3rd embodiment, whether normal with the judgement state that catches fire, detect airflow rate and can judge also whether the state of catching fire is normal.
As mentioned above, according to first scheme of the present invention, the flow rate detection device detects sends the combustion-supporting of combustion chamber to The flow velocity of air or fuel gas, whether the burning controller judges the state that catches fire according to the down state of flow velocity Normally, so, the flow rate detection device burnt and the gases affect of discharging very not big, therefore worsen few, this Just make its detection of can correctly catching fire.
According to alternative plan of the present invention, if the flow velocity of combustion-supporting air or fuel gas eases down to appointment Numerical value or some more low, burning controller just judge that the state of catching fire is normal, therefore can distinguish the part point And light fully, avoid firing operation failure.
According to third party's case of the present invention, the burning controller is measured from starting igniting to combustion-supporting air or flammable The flow velocity of gas lowers the used time, if the time of measuring reach default numerical value or more some more, just Judge that the state of catching fire is abnormal, in the time of therefore can notifying easily the suitable maintenance of operator/verification Between safeguard/verification.
According to cubic case of the present invention, the flow rate detection device is to use the air-flow of miniature air-flow sensing chip to pass Sensor the heater block and the temperature sensing component that are made on the silicon chip are wherein arranged, so the flow rate detection device can To detect air-flow speed with high sensitivity and high reliability.
Claims (4)
1. a combustion control system comprises:
A flow rate detection device is used for detecting the combustion air sent in the firing chamber or the flow velocity of inflammable gas;
A combustion controller when the rapid attenuating of the combustion air that the pulsating wave of generation causes because igniting is exploded when the firing chamber ignition operation or the flow velocity of inflammable gas is detected by above-mentioned flow rate detection device, determines that the state of catching fire is normally to catch fire; And when the rapid attenuating of described flow velocity is not detected, determine that the state of catching fire is improper catching fire.
2. according to a combustion control system of claim 1, it is characterized in that: above-mentioned combustion controller is to catch fire normally when the flow velocity of combustion air or inflammable gas eases down to default numerical value or lower with regard to the judgement state of catching fire.
3. according to a combustion control system of claim 1, it is characterized in that: above-mentioned combustion controller is measured from the starting ignition to the combustion air or the flow velocity of inflammable gas lowers the used time, if the time of measuring reaches default numerical value or more some more, just judge that the state of catching fire is abnormal catching fire.
4. according to any combustion control system in the claim 1 to 3, it is characterized in that: above-mentioned flow rate detection device is to use the pneumatic sensor of miniature air-flow sensing chip, it is characterized in that: the heater block and the temperature sensing component that are made on the silicon chip are arranged.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP318196/95 | 1995-12-06 | ||
| JP31819695A JP3366516B2 (en) | 1995-12-06 | 1995-12-06 | Combustion control device |
| JP318196/1995 | 1995-12-06 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1158956A CN1158956A (en) | 1997-09-10 |
| CN1167899C true CN1167899C (en) | 2004-09-22 |
Family
ID=18096522
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB961218894A Expired - Fee Related CN1167899C (en) | 1995-12-06 | 1996-12-05 | Combustion control system |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0778448B1 (en) |
| JP (1) | JP3366516B2 (en) |
| CN (1) | CN1167899C (en) |
| DE (1) | DE69614230T2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005009017A1 (en) * | 2005-02-28 | 2006-08-31 | Kutzner + Weber Gmbh | Combustion system e.g. for regulating combustion system according to its ventilation or exhaust actual conditions, has chamber having attached exit gas line for exhaust gases with controllable mechanism influencing operating conditions |
| CN101701157B (en) * | 2009-09-21 | 2013-03-20 | 芜湖新兴铸管有限责任公司 | Horizontal temperature regulating and controlling system of coke oven heated by coke oven gas |
| JP2017138018A (en) * | 2016-02-01 | 2017-08-10 | アズビル株式会社 | Combustion system |
| EP3396248B1 (en) * | 2017-04-28 | 2020-03-11 | Vaillant GmbH | Method for detecting defects in a gas safety valve of heating devices |
| DE102022103736A1 (en) | 2022-02-17 | 2023-08-17 | Vaillant Gmbh | Procedure for starting up a heater, computer program, regulation and control device, heater and use of a parameter |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02161212A (en) * | 1988-12-14 | 1990-06-21 | Harman Co Ltd | Fuel-burning equipment |
| JP3025524B2 (en) * | 1990-10-25 | 2000-03-27 | バブコツク日立株式会社 | Control unit for pulverized coal combustion equipment |
-
1995
- 1995-12-06 JP JP31819695A patent/JP3366516B2/en not_active Expired - Fee Related
-
1996
- 1996-11-27 DE DE69614230T patent/DE69614230T2/en not_active Expired - Fee Related
- 1996-11-27 EP EP96118964A patent/EP0778448B1/en not_active Expired - Lifetime
- 1996-12-05 CN CNB961218894A patent/CN1167899C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1158956A (en) | 1997-09-10 |
| JP3366516B2 (en) | 2003-01-14 |
| EP0778448B1 (en) | 2001-08-01 |
| EP0778448A3 (en) | 1999-02-24 |
| EP0778448A2 (en) | 1997-06-11 |
| JPH09159160A (en) | 1997-06-20 |
| DE69614230D1 (en) | 2001-09-06 |
| DE69614230T2 (en) | 2002-05-08 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
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Granted publication date: 20040922 Termination date: 20131205 |