CN104633699A - Chain steam boiler combustion control method - Google Patents
Chain steam boiler combustion control method Download PDFInfo
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- CN104633699A CN104633699A CN201310561840.0A CN201310561840A CN104633699A CN 104633699 A CN104633699 A CN 104633699A CN 201310561840 A CN201310561840 A CN 201310561840A CN 104633699 A CN104633699 A CN 104633699A
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Abstract
A chain steam boiler combustion control method comprises the steps of differential pressure sampling and steam usage amount change sampling. The method for differential pressure sampling comprises the steps of detecting the steam pressure of a chain steam boiler, calculating the pressure difference between actual output steam pressure and set initial steam pressure, and conducting self-adaption non-linear estimation according to the pressure difference. The method for steam usage amount change sampling comprises the steps of detecting the steam pressure output fluctuation information of the chain steam boiler, calculating the steam usage amount change according to the steam pressure output fluctuation information, and conducting self-adaption non-linear estimation according to the steam usage amount change. By means of non-linear estimation, non-linear control of the rotating speeds of an air blower, an induced draft fan and a fire grate can be achieved according to the downstream steam usage amount change, and then the combustion zone of the steam boiler is controlled so that the boiler can operate at a proper working point. In this way, constant-pressure steam is provided, and fuel cost is saved.
Description
Technical field
The present invention relates to the control technology field of combustion apparatus, particularly relate to a kind of chain steam boiler method for controlling combustion.
Background technology
In the Small And Medium Capacity chain steam boiler of routine, realize stoker feed by configuration traveling-grate stoker, carry out force ventilation by air blast, air-introduced machine.As shown in Figure 1, during real work, fuel is fallen on fire grate 2 from coal bunker 1, enters burner hearth 3, and air blast 4 is carried containing the abundant air of oxygen to burner hearth 3, and both complete burning in burner hearth 3, and release heat; The high-temperature gas completing burning is taken out by air-introduced machine 5 and is drawn, successively by superheater 6, economizer 7, deduster 8, chimney 9 discharged to air; The cinder completing burning is carried by fire grate 2, discharges boiler; Aqueous water pumps into boiler by water pump 10, is first heated by the economizer 7 in flue, then in burner hearth 3, is become steam by heating, add thermal output further finally by superheater.
For saving the energy, ensure coal-fired Thorough combustion, improving fuel availability is the core missions that steam boiler controls.In other words, if fire grate gait of march, blower speed, the ratio of air-introduced machine rotating speed is unreasonable, will cause the waste of the energy.At present, in medium and small boiler combustion system, conventional control method mainly comprises: 1) Artificial Control fire grate gait of march, blower speed, air-introduced machine rotating speed, thus controls boiler combustion.2) fuel up amount weighing mechanism and air measuring mechanism, measures and enters fuel quantity in burner hearth and air quantity, then carry out combustion control according to the ratio of wind and fuel.3) install visible ray probe and air measuring mechanism additional, the energy level being extrapolated boiler combustion by visible ray probe measurement flame energy signal goes adjustment air distribution amount with this, changes wind coal proportion, realizes the normal automatic combustion of boiler.4) install optic probe and air measuring mechanism additional, adopt flame image method measure boiler combustion radiant energy and temperature field and control boiler combustion.
But, or need skilled kettleman rule of thumb ceaselessly to adjust fire grate gait of march, blower speed, air-introduced machine rotating speed; Be absorbed in the Thorough combustion of fuel, improve efficiency of combustion.And the output to steam pressure, and do not relate to according to steam consumption Self Adaptive Control fired coal combustion.
Summary of the invention
For problems of the prior art, the object of the present invention is to provide a kind of chain steam boiler method for controlling combustion, downstream gas consumption can be adapted to, nonlinear Control air blast, air-introduced machine, fire grate rotating speed, and then control steam boiler combustion zone, make boiler operatiopn in rational operating point; Play and constant pressure steam is provided, the effect of fuel saving expense.
For reaching above object, the present invention adopts following technical scheme.
A kind of chain steam boiler method for controlling combustion, is characterized in that, comprise the following steps:
The first step, calculates pressure reduction, detects the actual output steam pressure of chain steam boiler, calculates the actual pressure reduction exported between steam pressure and setting primary steam pressure;
Second step, calculation of steam use amount fluctuates, last cycle steamed steam pressure of sampling, and current period pressure is deducted last cycle steamed steam pressure P1 and obtains the fluctuation of output steam pressure, then according to the fluctuation of output steam pressure fluctuation calculation of steam use amount;
3rd step, controls steam boiler burning, according to pressure reduction change and the fluctuation of steam use amount, adopts adaptive nonlinear control blower speed, air-introduced machine rotating speed and fire grate rotating speed, and then controls steam boiler combustion zone, make boiler operatiopn in rational operating point.
As a kind of preferred embodiment of the present invention, described controller adopts the mode of adaptive nonlinear control, namely by programming by the different pressure reduction changes under setting primary steam pressure, blower speed, air-introduced machine rotating speed and the fire grate rotating speed solidification corresponding to the fluctuation of different steam use amount in the controller; During real work, controller, according to primary steam force value, pressure reduction changing value, the steam use amount undulating value of reality, adjusts blower speed, air-introduced machine rotating speed and fire grate rotating speed automatically.
As a kind of preferred embodiment of the present invention, include pressure sensor self-inspection: adopt two pressure sensors to detect the steam pressure of steam boiler in calculating pressure reduction step simultaneously, when the pressure differential that these two pressure sensors export exceeds set error, judge that pressure sensor breaks down, be switched to Non-follow control and pressure sensor is broken down and point out.
As a kind of preferred embodiment of the present invention, described pressure sensor is arranged on by the steam (vapor) outlet of steam boiler.
As a kind of preferred embodiment of the present invention, shown chain steam boiler is the Small And Medium Capacity chain steam boiler of capacity at below 30t/h.
Compared with prior art, a kind of chain steam boiler method for controlling combustion provided by the invention, pressure sensor is utilized to detect the steam pressure change of steam boiler in real time, to reach the steam consumption situation of change of monitoring downstream industry equipment, and according to the result that pressure sensor feeds back, the rotating speed of adaptive nonlinear control boiler blower, air-introduced machine, fire grate, and then the burning controlling boiler.Can make coal-fired Thorough combustion like this, and the heat that burning produces fully is absorbed by water or steam; Effectively reduce firing rate, decrease noxious gas emission, alleviate the labour intensity of kettleman.
Accompanying drawing explanation
Figure 1 shows that existing chain steam boiler structural representation;
Figure 2 shows that chain steam boiler method for controlling combustion schematic diagram provided by the invention;
Figure 3 shows that chain steam boiler method for controlling combustion flow chart (in figure, dotted line frame represents controller) provided by the invention;
Figure 4 shows that the burning figure utilizing chain steam boiler method for controlling combustion provided by the invention to obtain.
Description of reference numerals:
1, coal bunker, 2, fire grate, 3, burner hearth, 4, air blast, 5, air-introduced machine, 6, superheater, 7, economizer, 8, deduster, 9, chimney, 10, water pump; 11, pressure sensor, 12, controller, 13, fresh fuel district, 14, volatilization subregion, 15, coke burning-zoneofoxidation, 16, coke burning-reducing zone, 17, burning-out zone.
Detailed description of the invention
For setting forth essence of the present invention further, by reference to the accompanying drawings the specific embodiment of the present invention is described as follows.
A chain steam boiler method for controlling combustion, is characterized in that as shown in Figure 2 and Figure 3, comprises the following steps:
The first step, calculates pressure reduction, detects the actual output steam pressure of chain steam boiler, calculates the actual pressure reduction exported between steam pressure and setting primary steam pressure;
Second step, calculation of steam use amount fluctuates, last cycle steamed steam pressure of sampling, and current period pressure is deducted last cycle steamed steam pressure and obtains the fluctuation of output steam pressure, then according to the fluctuation of output steam pressure fluctuation calculation of steam use amount;
3rd step, controls steam boiler burning, according to pressure reduction change and the fluctuation of steam use amount, utilizes controller automatically to control blower speed, air-introduced machine rotating speed and fire grate rotating speed, and then controls steam boiler combustion zone, make boiler operatiopn in rational operating point.
Wherein, described chain steam boiler is the Small And Medium Capacity chain steam boiler of capacity at below 30t/h, steam pressure and the fluctuation information of described chain steam boiler are detected by pressure sensor 11, and the control of air blast, air-introduced machine, fire grate rotating speed is realized by controller 12; Described pressure sensor is connected with signal between controller.
It is the mode of adaptive nonlinear control that described controller controls adopted automatically.Namely by programming by the different pressure reduction changes under setting primary steam pressure, blower speed, air-introduced machine rotating speed and the fire grate rotating speed solidification corresponding to the fluctuation of different steam use amount in the controller.During real work, controller, according to primary steam force value, pressure reduction changing value, the steam use amount undulating value of reality, adjusts blower speed, air-introduced machine rotating speed and fire grate rotating speed automatically.
Described controller 12 being connected with the controller sampling time arranges module, is used for adjusting the sampling period.In the present embodiment, the quantity of preferred pressure sensor is two, and two pressure sensors are arranged on the steam (vapor) outlet position of chain steam boiler.In actual detection, when the pressure differential that two pressure sensors export exceeds set error, (set error is generally 10KPa, user independently can adjust according to actual conditions), judge that pressure sensor breaks down, be switched to Non-follow control and the signal that broken down by pressure sensor is sent to production management system.
As shown in Figure 4, it is the burning figure utilizing above-mentioned method for controlling combustion to obtain, the fuel combustion state on whole fire grate is shown in figure, wherein, icon 13 represents fresh fuel district, and icon 14 represents separates out volatilization subregion, and icon 15 represents coke burning-zoneofoxidation, icon 16 represents coke burning-reducing zone, and icon 17 represents burning-out zone; As can be seen from the figure: fire coal is complete in the burning of the fire grate end, and burning-out zone 17 is shorter.By lot of experiment validation, the chain steam boiler that the method for controlling combustion utilizing the present embodiment to provide controls, the burning-out zone length on its fire grate is shorter, and this shows fire coal Thorough combustion, and the heat that burning produces fully is absorbed by water or steam.
Above detailed description of the invention has been described in detail essence of the present invention, but can not limit protection scope of the present invention with this.Apparently, under the enlightenment of essence of the present invention, the art those of ordinary skill also can carry out many improvement and modification, it should be noted that these improve and modify and all drops within claims of the present invention.
Claims (5)
1. a chain steam boiler method for controlling combustion, is characterized in that, comprises the following steps:
The first step, calculates pressure reduction, detects the actual output steam pressure of chain steam boiler, calculates the actual pressure reduction exported between steam pressure and setting primary steam pressure;
Second step, calculation of steam use amount fluctuates, last cycle steamed steam pressure of sampling, and current period pressure is deducted last cycle steamed steam pressure and obtains the fluctuation of output steam pressure, then according to the fluctuation of output steam pressure fluctuation calculation of steam use amount;
3rd step, controls steam boiler burning, according to pressure reduction change and the fluctuation of steam use amount, adopts controller automatically to control blower speed, air-introduced machine rotating speed and fire grate rotating speed, and then controls steam boiler combustion zone, make boiler operatiopn in rational operating point.
2. chain-grate boiler automatic steam control method according to claim 1, it is characterized in that, described controller adopts the mode of adaptive nonlinear control, namely by programming by the different pressure reduction changes under setting primary steam pressure, blower speed, air-introduced machine rotating speed and the fire grate rotating speed solidification corresponding to the fluctuation of different steam use amount in the controller; During real work, controller, according to primary steam force value, pressure reduction changing value, the steam use amount undulating value of reality, adjusts blower speed, air-introduced machine rotating speed and fire grate rotating speed automatically.
3. chain-grate boiler automatic steam control method according to claim 1, it is characterized in that, include pressure sensor self-inspection: adopt two pressure sensors to detect the steam pressure of steam boiler in calculating pressure reduction step simultaneously, when the pressure differential that these two pressure sensors export exceeds set error, judge that pressure sensor breaks down, be switched to Non-follow control and pressure sensor is broken down and point out.
4. chain-grate boiler automatic steam control method according to claim 3, it is characterized in that, described pressure sensor is arranged on by the steam (vapor) outlet of steam boiler.
5. chain-grate boiler automatic steam control method according to claim 1, is characterized in that, shown chain steam boiler is the Small And Medium Capacity chain steam boiler of capacity at below 30t/h.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310561840.0A CN104633699A (en) | 2013-11-12 | 2013-11-12 | Chain steam boiler combustion control method |
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| CN201310561840.0A CN104633699A (en) | 2013-11-12 | 2013-11-12 | Chain steam boiler combustion control method |
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| CN104633699A true CN104633699A (en) | 2015-05-20 |
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| CN201310561840.0A Pending CN104633699A (en) | 2013-11-12 | 2013-11-12 | Chain steam boiler combustion control method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108456593A (en) * | 2018-04-08 | 2018-08-28 | 福建鑫绿林产品开发有限公司 | A kind of fir essential oil production fuel adding method |
| CN110398924A (en) * | 2019-08-02 | 2019-11-01 | 安徽南瑞中天电力电子有限公司 | A kind of temperature and humidity in storeroom monitoring, alarming equipment |
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| US4278052A (en) * | 1979-09-27 | 1981-07-14 | Leeds & Northrup Company | Boiler control system |
| CN2898630Y (en) * | 2006-04-22 | 2007-05-09 | 陆磊 | Automatic energy-saving control system of mini-medium fired-coal chain boiler |
| CN103032866A (en) * | 2011-09-28 | 2013-04-10 | 三浦工业株式会社 | Boiler steam amount measuring method, boiler load analyzing method, boiler steam amount measuring apparatus, and boiler load analyzing apparatus |
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2013
- 2013-11-12 CN CN201310561840.0A patent/CN104633699A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4278052A (en) * | 1979-09-27 | 1981-07-14 | Leeds & Northrup Company | Boiler control system |
| CN2898630Y (en) * | 2006-04-22 | 2007-05-09 | 陆磊 | Automatic energy-saving control system of mini-medium fired-coal chain boiler |
| CN103032866A (en) * | 2011-09-28 | 2013-04-10 | 三浦工业株式会社 | Boiler steam amount measuring method, boiler load analyzing method, boiler steam amount measuring apparatus, and boiler load analyzing apparatus |
Non-Patent Citations (3)
| Title |
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| 张亮明等: "《工业锅炉热工检测与过程控制》", 30 September 1992, 天津大学出版社 * |
| 杜友军等: "链条锅炉主汽压力的模糊控制在DCS系统中的实现", 《科技致富向导》 * |
| 鹿世金: "《工业锅炉节能的控制技术》", 31 December 1993, 兵器工业出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108456593A (en) * | 2018-04-08 | 2018-08-28 | 福建鑫绿林产品开发有限公司 | A kind of fir essential oil production fuel adding method |
| CN110398924A (en) * | 2019-08-02 | 2019-11-01 | 安徽南瑞中天电力电子有限公司 | A kind of temperature and humidity in storeroom monitoring, alarming equipment |
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Application publication date: 20150520 |