CN105465822A - Boiler automatic control system and method - Google Patents
Boiler automatic control system and method Download PDFInfo
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- CN105465822A CN105465822A CN201510908999.4A CN201510908999A CN105465822A CN 105465822 A CN105465822 A CN 105465822A CN 201510908999 A CN201510908999 A CN 201510908999A CN 105465822 A CN105465822 A CN 105465822A
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Abstract
The invention belongs to the technical field of boiler control systems, and discloses a boiler automatic control system and method. The control system comprises a feeding device, a combustion chamber, a smoke exhaust device, a steam pressure sensor, a steam temperature sensor, a smoke detector, a central control unit, a feeding conveyor, an air blower, a grate speed adjusting machine and an induced draft fan. The control method comprises the steps of feeding, pressure and temperature detecting, smoke detecting and combustion control. According to the boiler automatic control system and the automatic control method, detection of smoke is introduced into the control system, multiple control over feeding and combusting of fuel can be achieved, generation of atmospheric pollutants is effectively reduced, and the fuel can be in the efficient combustion state.
Description
Technical field
The present invention relates to boiler control system technical field, particularly relate to a kind of boiler automatic control system and autocontrol method.
Background technology
Boiler is a kind of energy conversion, and the chemical energy of fuel combustion is converted to the heat energy of steam or high-temperature water by it.In combustion apparatus part, fuel combustion constantly releases heat, and produce a large amount of high-temperature flue gas, flue gas is discharged finally by fume extractor simultaneously.Boiler is widely used in the productive life of modern society, the existing boiler majority being fuel with coal, oil or living beings is difficult to the requirement reaching " emission standard of air pollutants for boilers " (GB13271-2014), especially, in the not clean-burning situation of fuel, pollute more serious.
In actual motion, it is economize energy that control boiler combustion is in optimum state, the key that decreasing pollution produce are raw.And the combustion process of boiler except with being designed with of boiler itself outside the Pass, the operation of more with one line boiler workman is closely bound up.Manual operation is difficult to accurate control, boiler can not be run in optimum state, not only waste the energy, and create a large amount of atmosphere pollutions.Therefore, need badly and a kind ofly effectively can reduce the generation of atmosphere pollution and the fuel in boiler can be made to be in boiler automatic control system and the Automatic Control of Boiler method of efficient burning state.
Summary of the invention
Technical problem to be solved by this invention, is that providing a kind of effectively can reduce the generation of atmosphere pollution and the fuel in boiler can be made to be in boiler automatic control system and the Automatic Control of Boiler method of efficient burning state.
The present invention solves the problems of the technologies described above adopted technical scheme:
A kind of boiler automatic control system, comprise feed arrangement, combustion chamber and fume extractor, described feed arrangement is by fuel area density to described combustion chamber, the flue gas that described combustion chamber combustion produces enters fume extractor and is discharged by described fume extractor, described boiler automatic control system also comprises steam pressure sensor, steam temperature sensor, flue gas detector, central controller, feeding conveyor, air blast, fire grate governor and air-introduced machine, described steam pressure sensor is for the steam pressure that detects in combustion chamber and institute's measuring pressure is inputted described central controller, described steam temperature sensor is for the vapor (steam) temperature that detects in combustion chamber and measured temperature is inputted described central controller, described flue gas detector is for detecting the gas componant in the flue gas of described combustion chamber generation, detection data are also inputted described central controller by concentration, the output of described central controller respectively with described feeding conveyor, air blast, fire grate governor and air-introduced machine connect, described feeding conveyor drives feed arrangement to regulate the fuel supply in described combustion chamber, described air blast, fire grate governor and air-introduced machine regulate the air quantity in described combustion chamber.
As the further improvement of technique scheme, described air blast comprises primary air fan and overfire air fan.
As the further improvement of technique scheme, described flue gas detector comprises oxygen detection module.
As the further improvement of technique scheme, described flue gas detector comprises hydrocarbon detection module.
As the further improvement of technique scheme, described flue gas detector comprises oxynitrides detection module.
As the further improvement of technique scheme, described flue gas detector comprises sulfur dioxide detection module.
A kind of Automatic Control of Boiler method, comprises step: charging, feed arrangement by fuel area density in combustion chamber; Pressure, temperature detection, steam pressure sensor detects the steam pressure in combustion chamber and institute's measuring pressure is inputted described central controller, and steam temperature sensor detects the vapor (steam) temperature in combustion chamber and measured temperature is inputted central controller; Flue gas inspection, flue gas detector detects the gas componant in the flue gas produced in combustion chamber, concentration and surveyed data is inputted central controller; Combustion System, the data obtained and the optimum working parameter preset contrast by central controller, control the supply of feeding conveyor to fuel again to regulate, control primary air fan, overfire air fan, fire grate governor and air-introduced machine and air quantity is regulated.
As the further improvement of technique scheme, in flue gas inspection step, the oxygen detection module in flue gas detector detects the oxygen concentration in flue gas and institute's measured value is inputted central controller; In burning control steps, the oxygen density value that central controller reception flue gas detector records also contrasts with the oxygen concentration range preset, and when the oxygen concentration of flue gas is too high, reduces post-blast machine rotating speed until reach default oxygen concentration range.
As the further improvement of technique scheme, in flue gas inspection step, the hydrocarbon detection module in flue gas detector detects the carbon monoxide in flue gas and gas concentration lwevel and institute's measured value is inputted central controller; In burning control steps, central controller receives the carbon monoxide that records of flue gas detector and carbon dioxide concentration value and the ratio of the two and the ratio range preset is contrasted, when the concentration proportion of carbon monoxide and carbon dioxide is too high, reduce the rotating speed of feeding conveyor and fire grate governor, increase the rotating speed of primary air fan until reach default ratio range simultaneously.
As the further improvement of technique scheme, in flue gas inspection step, the oxynitrides detection module in flue gas detector detects the nitric oxide in flue gas and content of nitrogen dioxide and institute's measured value is inputted central controller; In burning control steps, central controller receives the concentration value of the nitric oxide that records of flue gas detector and nitrogen dioxide and the concentration value recorded and the concentration range preset is contrasted, when the concentration value recorded is too high, reduce the rotating speed of primary air fan, overfire air fan and fire grate governor until reach default concentration range.
As the further improvement of technique scheme, in burning control steps, the force value that central controller reception steam pressure sensor records also contrasts with the pressure limit preset; When pressure is lower than the pressure limit preset, increases the rotating speed of air blast, fire grate governor and feeding conveyor, reduce the rotating speed of air-introduced machine, until reach default pressure limit simultaneously; When pressure is higher than the pressure limit preset, reduces the rotating speed of air blast, fire grate governor and feeding conveyor, increase the rotating speed of air-introduced machine, until reach default pressure limit simultaneously.
As the further improvement of technique scheme, in burning control steps, the temperature value that central controller reception steam temperature sensor records also contrasts with the temperature range preset; When temperature is lower than the temperature range preset, increases the rotating speed of fire grate governor, reduce the rotating speed of overfire air fan, until reach default temperature range simultaneously; When temperature is higher than the temperature range preset, reduces the rotating speed of fire grate governor, increase the rotating speed of overfire air fan, until reach default temperature range simultaneously.
The invention has the beneficial effects as follows:
The detection of flue gas is introduced in control system by boiler automatic control system of the present invention and autocontrol method, can realize the multiple control of charging to fuel and burning, effectively reduces the generation of atmosphere pollution and fuel can be made to be in efficient fired state.
Accompanying drawing explanation
Fig. 1 is the structure chart of boiler automatic control system of the present invention;
Fig. 2 is the structural representation of the Steam pressure control of boiler automatic control system of the present invention;
Fig. 3 is the flow chart of the Steam pressure control of Automatic Control of Boiler method of the present invention;
Fig. 4 is the structural representation that the vapor (steam) temperature of boiler automatic control system of the present invention controls;
Fig. 5 is the flow chart that the vapor (steam) temperature of Automatic Control of Boiler method of the present invention controls;
Fig. 6 is the structural representation that the oxygen concentration of boiler automatic control system of the present invention controls;
Fig. 7 is the flow chart that the oxygen concentration of Automatic Control of Boiler method of the present invention controls;
Fig. 8 is the structural representation that the hydrocarbon concentration of boiler automatic control system of the present invention controls;
Fig. 9 is the flow chart that the hydrocarbon concentration of Automatic Control of Boiler method of the present invention controls;
Figure 10 is the structural representation that the oxynitride concentration of boiler automatic control system of the present invention controls;
Figure 11 is the flow chart that the oxynitride concentration of Automatic Control of Boiler method of the present invention controls.
Detailed description of the invention
Be clearly and completely described below with reference to embodiment and the accompanying drawing technique effect to design of the present invention, concrete structure and generation, to understand object of the present invention, characteristic sum effect fully.Obviously; described embodiment is a part of embodiment of the present invention, instead of whole embodiment, based on embodiments of the invention; other embodiments that those skilled in the art obtains under the prerequisite not paying creative work, all belong to the scope of protection of the invention.In addition, all connection/annexations related in patent, not singly refer to that component directly connects, and refer to and according to concrete performance, can connect auxiliary by adding or reducing, and form more excellent draw bail.Each technical characteristic in the present invention, can combination of interactions under the prerequisite of not conflicting conflict.
Please refer to Fig. 1, boiler automatic control system of the present invention comprises feed arrangement, combustion chamber, fume extractor, steam pressure sensor, steam temperature sensor, flue gas detector, central controller, feeding conveyor, air blast, fire grate governor and air-introduced machine; Air blast comprises primary air fan and overfire air fan.
Feed arrangement by fuel area density in combustion chamber, the flue gas that combustion chamber combustion produces enters fume extractor and is discharged by fume extractor, steam pressure sensor is for detecting steam pressure in combustion chamber and by institute's measuring pressure input central controller, steam temperature sensor is for the vapor (steam) temperature that detects in combustion chamber and measured temperature is inputted central controller, flue gas detector is for detecting the gas componant in the flue gas of combustion chamber generation, concentration also will detect data input central controller, the output of central controller respectively with feeding conveyor, air blast, fire grate governor and air-introduced machine connect, feeding conveyor drives feed arrangement to regulate the fuel supply in combustion chamber, primary air fan, overfire air fan, fire grate governor and air-introduced machine regulate the air quantity in combustion chamber.
Flue gas detector comprises oxygen detection module, hydrocarbon detection module, oxynitrides detection module and sulfur dioxide detection module.
The data input central processing unit that each sensor assembly in flue gas detector will gather, by central processing unit, the data of input and the optimum working parameter preset are contrasted, then the operation of feeding conveyor, primary air fan, overfire air fan, fire grate governor and air-introduced machine is controlled, the course of conveying of adjustment fuel, the supply of adjustment air quantity, burning is made to reach optimum state, the generation of decreasing pollution thing.
Automatic Control of Boiler method of the present invention comprises Automatic Control of Boiler method, comprises the steps:
S1, charging, feed arrangement by fuel area density in combustion chamber.
S2, pressure, temperature detection, steam pressure sensor detects the steam pressure in combustion chamber and institute's measuring pressure is inputted described central controller, and steam temperature sensor detects the vapor (steam) temperature in combustion chamber and measured temperature is inputted central controller.
S3, flue gas inspection, flue gas detector detects the gas componant in the flue gas produced in combustion chamber, concentration and surveyed data is inputted central controller.
S4, Combustion System, the data obtained and the optimum working parameter preset contrast by central controller, control the supply of feeding conveyor to fuel again to regulate, control primary air fan, overfire air fan, fire grate governor and air-introduced machine and air quantity is regulated.
Automatic Control of Boiler method of the present invention adopts the steam pressure in steam pressure sensor collection combustion chamber, gathers the vapor (steam) temperature in combustion chamber, gathered the oxygen concentration at combustor exit place by flue gas detector with steam temperature sensor, carbonomonoxide concentration, gas concentration lwevel, nitric oxide concentration, content of nitrogen dioxide, sulfur dioxide concentration, flue gas detector processes after gathering primary data automatically, exports following parameter: gas concentration lwevel, carbonomonoxide concentration, sulfur dioxide concentration, combustion efficiency value, excess air, flue gas loses, the dew point of special fuel, oxynitrides content etc., above-mentioned each sensor is connected with central controller respectively, the data collected is transported to central controller, and result compared with the parameter set, is fed back to feeding conveyor the data collected by central controller, primary air fan, overfire air fan, fire grate governor and air-introduced machine, adjust the operational factor of each parts, makes boiler operatiopn in optimum state, the generation of decreasing pollution thing.
Fig. 2 and Fig. 3 is respectively function structure chart and the flow chart of boiler pressure control.In burning control steps, the force value that central controller reception steam pressure sensor records also contrasts with the pressure limit preset; When pressure is lower than the pressure limit preset, increases the rotating speed of primary air fan, fire grate governor and feeding conveyor, reduce the rotating speed of air-introduced machine, until reach default pressure limit simultaneously; When pressure is higher than the pressure limit preset, reduces the rotating speed of primary air fan, fire grate governor and feeding conveyor, increase the rotating speed of air-introduced machine, until reach default pressure limit simultaneously.
Specifically, steam pressure sensor conversion current signal through A/D module to central controller, central processing unit receives pressure signal, if pressure is lower than the pressure limit preset, then by regulating the frequency converter of primary air fan to increase primary air fan rotating speed, by regulating the frequency converter of air-introduced machine to reduce air-introduced machine rotating speed, by regulating the frequency converter of feeding conveyor to increase feeding conveyor rotating speed, the frequency converter of governor is arranged to increase fire grate governor rotating speed by regulating stove, and then make pressure increase, reach critical field; If pressure higher than the pressure limit preset, then can make pressure drop by contrary adjustment, reach setting range.
Fig. 4 and Fig. 5 is respectively function structure chart and the flow chart of boiler steam temperature control.In burning control steps, the temperature value that central controller reception steam temperature sensor records also contrasts with the temperature range preset; When temperature is lower than the temperature range preset, increases the rotating speed of fire grate governor, reduce the rotating speed of overfire air fan, until reach default temperature range simultaneously; When temperature is higher than the temperature range preset, reduces the rotating speed of fire grate governor, increase the rotating speed of overfire air fan, until reach default temperature range simultaneously.
Fig. 6 and Fig. 7 is respectively function structure chart and the flow chart of Oxygen control.In flue gas inspection step, the oxygen detection module in flue gas detector detects the oxygen concentration in flue gas and institute's measured value is inputted central controller; In burning control steps, the oxygen density value that central controller reception flue gas detector records also contrasts with the oxygen concentration range preset, and when the oxygen concentration of flue gas is too high, reduces post-blast machine rotating speed until reach default oxygen concentration range.
Fig. 8 and Fig. 9 is respectively function structure chart and the flow chart of hydrocarbon control.In flue gas inspection step, the hydrocarbon detection module in flue gas detector detects the carbon monoxide in flue gas and gas concentration lwevel and institute's measured value is inputted central controller; In burning control steps, central controller receives the carbon monoxide that records of flue gas detector and carbon dioxide concentration value and the ratio of the two and the ratio range preset is contrasted, when the concentration proportion of carbon monoxide and carbon dioxide is too high, reduce the rotating speed of feeding conveyor and fire grate governor, increase the rotating speed of primary air fan until reach default ratio range simultaneously.
Specifically, carbonomonoxide concentration adopts electrochemical sensor to detect, and carbon dioxide adopts NDIR sensor to detect, and testing result is with CO/CO
2form be delivered to central controller, what in ratio lower proof combustion chamber, burning was carried out is more abundant, if ratio is too high, then shows that burning is insufficient or supply hypoxgia, the rotating speed of feeding conveyor, fire grate governor and primary air fan need be regulated, increase fuel combustion time and oxygen-supplying amount.
In addition, carbon monoxide sensing protector is also provided with in flue gas detector, when carbonomonoxide concentration in flue gas exceeds CO sensor measurement scope (> 4000ppm), CO sensor can cut out automatically, and the air douche pump meeting unlatching automatically that instrument is built-in, extract fresh air and be supplied to CO sensor, realize real time protection; When carbonomonoxide concentration is lower than 1600ppm, flushing pump will quit work, and measurement restarts.The normal amount cls analysis of other sensors can not be had influence in this process.
Figure 10 and Figure 11 is respectively function structure chart and the flow chart of oxynitrides control.In flue gas inspection step, the oxynitrides detection module in flue gas detector detects the nitric oxide in flue gas and content of nitrogen dioxide and institute's measured value is inputted central controller; In burning control steps, central controller receives the concentration value of the nitric oxide that records of flue gas detector and nitrogen dioxide and the concentration value recorded and the concentration range preset is contrasted, when the concentration value recorded is too high, reduce the rotating speed of primary air fan, overfire air fan and fire grate governor until reach default concentration range.
Specifically, nitric oxide and content of nitrogen dioxide adopt electrochemical sensor to detect, and testing result is with NO
xrepresent.NO
xas the air pollutants of a quasi-representative, concentration is more low better, as the NO that burning produces
xtime too high, by regulating oxygen-supplying amount, regional hypoxia environment can be created, makes it to be reduced to N
2.
Sulfur dioxide mainly adopts electrochemical sensor to detect, with SO
2concentration is that output signal is sent to central controller, because the chemical property of sulfide, the adjustment not in combustion process can reduce, and need based on fuel, combustion case to adopt before different burnings desulfurization or desulfurization industry after burning, this control system is for SO
2concentration is based on monitoring, if its concentration is far more than normal combustion standard, then system can send instruction, by automatically controlling to transfer Artificial Control to, checks SO
2concentration over-standard reason also takes corresponding pollution treatment measure.
More than that preferred embodiment of the present invention is illustrated, but the present invention is not limited to described embodiment, those of ordinary skill in the art also can make all equivalent variations or replacement under the prerequisite without prejudice to spirit of the present invention, and these equivalent distortion or replacement are all included in the application's claim limited range.
Claims (12)
1. a boiler automatic control system, comprise feed arrangement, combustion chamber and fume extractor, described feed arrangement is by fuel area density to described combustion chamber, the flue gas that described combustion chamber combustion produces enters fume extractor and is discharged by described fume extractor, it is characterized in that: described boiler automatic control system also comprises steam pressure sensor, steam temperature sensor, flue gas detector, central controller, feeding conveyor, air blast, fire grate governor and air-introduced machine, described steam pressure sensor is for the steam pressure that detects in combustion chamber and institute's measuring pressure is inputted described central controller, described steam temperature sensor is for the vapor (steam) temperature that detects in combustion chamber and measured temperature is inputted described central controller, described flue gas detector is for detecting the gas componant in the flue gas of described combustion chamber generation, detection data are also inputted described central controller by concentration, the output of described central controller respectively with described feeding conveyor, air blast, fire grate governor and air-introduced machine connect, described feeding conveyor drives feed arrangement to regulate the fuel supply in described combustion chamber, described air blast, fire grate governor and air-introduced machine regulate the air quantity in described combustion chamber.
2. boiler automatic control system as claimed in claim 1, is characterized in that: described air blast comprises primary air fan and overfire air fan.
3. boiler automatic control system as claimed in claim 1 or 2, is characterized in that: described flue gas detector comprises oxygen detection module.
4. boiler automatic control system as claimed in claim 1 or 2, is characterized in that: described flue gas detector comprises hydrocarbon detection module.
5. boiler automatic control system as claimed in claim 1 or 2, is characterized in that: described flue gas detector comprises oxynitrides detection module.
6. boiler automatic control system as claimed in claim 1 or 2, is characterized in that: described flue gas detector comprises sulfur dioxide detection module.
7. an Automatic Control of Boiler method, comprises step:
Charging, feed arrangement by fuel area density in combustion chamber;
Pressure, temperature detection, steam pressure sensor detects the steam pressure in combustion chamber and institute's measuring pressure is inputted described central controller, and steam temperature sensor detects the vapor (steam) temperature in combustion chamber and measured temperature is inputted central controller;
Flue gas inspection, flue gas detector detects the gas componant in the flue gas produced in combustion chamber, concentration and surveyed data is inputted central controller;
Combustion System, the data obtained and the optimum working parameter preset contrast by central controller, control the supply of feeding conveyor to fuel again to regulate, control primary air fan, overfire air fan, fire grate governor and air-introduced machine and air quantity is regulated.
8. Automatic Control of Boiler method as claimed in claim 7, is characterized in that:
In flue gas inspection step, the oxygen detection module in flue gas detector detects the oxygen concentration in flue gas and institute's measured value is inputted central controller;
In burning control steps, the oxygen density value that central controller reception flue gas detector records also contrasts with the oxygen concentration range preset, and when the oxygen concentration of flue gas is too high, reduces post-blast machine rotating speed until reach default oxygen concentration range.
9. Automatic Control of Boiler method as claimed in claim 7, is characterized in that:
In flue gas inspection step, the hydrocarbon detection module in flue gas detector detects the carbon monoxide in flue gas and gas concentration lwevel and institute's measured value is inputted central controller;
In burning control steps, central controller receives the carbon monoxide that records of flue gas detector and carbon dioxide concentration value and the ratio of the two and the ratio range preset is contrasted, when the concentration proportion of carbon monoxide and carbon dioxide is too high, reduce the rotating speed of feeding conveyor and fire grate governor, increase the rotating speed of primary air fan until reach default ratio range simultaneously.
10. Automatic Control of Boiler method as claimed in claim 7, is characterized in that:
In flue gas inspection step, the oxynitrides detection module in flue gas detector detects the nitric oxide in flue gas and content of nitrogen dioxide and institute's measured value is inputted central controller;
In burning control steps, central controller receives the concentration value of the nitric oxide that records of flue gas detector and nitrogen dioxide and the concentration value recorded and the concentration range preset is contrasted, when the concentration value recorded is too high, reduce the rotating speed of primary air fan, overfire air fan and fire grate governor until reach default concentration range.
11. Automatic Control of Boiler methods as described in any one of claim 7 to 10, is characterized in that:
In burning control steps, the force value that central controller reception steam pressure sensor records also contrasts with the pressure limit preset;
When pressure is lower than the pressure limit preset, increases the rotating speed of air blast, fire grate governor and feeding conveyor, reduce the rotating speed of air-introduced machine, until reach default pressure limit simultaneously;
When pressure is higher than the pressure limit preset, reduces the rotating speed of air blast, fire grate governor and feeding conveyor, increase the rotating speed of air-introduced machine, until reach default pressure limit simultaneously.
12. Automatic Control of Boiler methods as described in any one of claim 7 to 10, is characterized in that:
In burning control steps, the temperature value that central controller reception steam temperature sensor records also contrasts with the temperature range preset;
When temperature is lower than the temperature range preset, increases the rotating speed of fire grate governor, reduce the rotating speed of overfire air fan, until reach default temperature range simultaneously;
When temperature is higher than the temperature range preset, reduces the rotating speed of fire grate governor, increase the rotating speed of overfire air fan, until reach default temperature range simultaneously.
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