CN102116484A - Combustion control method and system for lignite-fired unit - Google Patents
Combustion control method and system for lignite-fired unit Download PDFInfo
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- CN102116484A CN102116484A CN201010001611XA CN201010001611A CN102116484A CN 102116484 A CN102116484 A CN 102116484A CN 201010001611X A CN201010001611X A CN 201010001611XA CN 201010001611 A CN201010001611 A CN 201010001611A CN 102116484 A CN102116484 A CN 102116484A
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 23
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 85
- 239000003546 flue gas Substances 0.000 claims abstract description 85
- 239000003245 coal Substances 0.000 claims abstract description 38
- 239000003077 lignite Substances 0.000 claims abstract description 37
- 230000001105 regulatory effect Effects 0.000 claims abstract description 19
- 239000007789 gas Substances 0.000 claims abstract description 13
- 230000001276 controlling effect Effects 0.000 claims abstract description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 47
- 239000001301 oxygen Substances 0.000 claims description 47
- 229910052760 oxygen Inorganic materials 0.000 claims description 47
- 239000003595 mist Substances 0.000 claims description 29
- 230000003750 conditioning effect Effects 0.000 claims description 28
- 239000000428 dust Substances 0.000 claims description 5
- 230000008030 elimination Effects 0.000 abstract 1
- 238000003379 elimination reaction Methods 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 26
- 239000000446 fuel Substances 0.000 description 19
- 239000002817 coal dust Substances 0.000 description 12
- 238000010586 diagram Methods 0.000 description 12
- 239000000779 smoke Substances 0.000 description 11
- 238000001035 drying Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 7
- 235000019504 cigarettes Nutrition 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 5
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 239000000284 extract Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The invention provides a combustion control method and a system for a lignite-fired unit, and the method comprises the following steps: feeding back flue gas sent out from an outlet of an induced draft fan to an inlet of a primary air fan; and using the primary air fan to mix the fed back flue gas with air sent in from outside, and sending the mixed gas into a boiler for the combustion of lignite through an air preheater and a coal pulverizer. By adopting the technical scheme, a flue gas regulating device is connected between the outlet of the induced draft fan and the inlet of the primary air fan through a flue, and a certain amount of the flue gas is doped into primary air, thereby not only reducing the using amount of the primary air of a boiler and controlling NOx within a qualified range, but also reducing the resistance of a primary air pipeline due to the elimination of a primary air heater and reducing power consumption of the primary air fan.
Description
Technical field
The present invention specifically, is method for controlling combustion and the system about a kind of brown coal unit about the brown coal field of combustion technology.
Background technology
Brown coal are the most shallow coals of colliery degree, account for about 12% of national coal reserves, will become the main source of China's energy.But often moisture is very big owing to it, needs an a large amount of wind during burning, makes that the primary air flow of input boiler is very big, NO
x(nitrogen oxide) is difficult to control, and flue gas loss simultaneously is very big, and boiler efficiency is very low.
As shown in Figure 1, the schematic diagram of the combustion control system of the brown coal unit that provides for prior art.Coal pulverizer 104 is connected between 103 outlets of boiler 105 primary air fans, overfire air fan 102 outlets connect and boiler 105, in air preheater 106, realize the air preheat of flue, secondary air channel road, a wind pipeline enclosure, deduster 107 is connected between the flue and air-introduced machine 101 inlets of air preheater, and the outlet of air-introduced machine links to each other with chimney 108.Because the temperature of the inlet drier of existing medium-speed pulverizer coal burning machine generally can not surpass 400 ℃, therefore, when using pure hot blast to carry out drying, just must strengthen primary air ratio for brown coal being carried out drying, perhaps increase the one-level air preheater again and improve temperature.
Summary of the invention
In order to solve the problem of primary air flow of the prior art, the invention provides a kind of method for controlling combustion and system of brown coal unit.
On the one hand, the invention provides a kind of method for controlling combustion of brown coal unit, described method comprises:
The flue gas that the air-introduced machine outlet is sent feeds back to the primary air fan inlet;
Described primary air fan mixes the flue gas of feedback with the air sent into of outside, and mist is sent into described boiler by air preheater and coal pulverizer brown coal are burnt.
On the other hand, the present invention also provides a kind of combustion control system of brown coal unit, and described system comprises: boiler, coal pulverizer, air preheater, dust removal machine, air-introduced machine, primary air fan, overfire air fan and chimney; Described system also comprises: flue gas conditioning device;
Described flue gas conditioning device is connected between described air-introduced machine outlet and the described primary air fan inlet by flue, and the flue gas that air-introduced machine is sent feeds back to described primary air fan inlet;
Described primary air fan mixes the flue gas of feedback with the air sent into of outside, and mist is sent into described boiler by described air preheater and coal pulverizer brown coal are burnt.
Beneficial effect of the present invention is, be connected between described air-introduced machine outlet and the described primary air fan inlet by flue by flue gas conditioning device, in a wind, mix a certain amount of flue gas, not only can reduce the use amount of a wind of boiler, and can be with N0
xBe controlled within the acceptability limit, owing to cancelled the steam air heater of a wind, reduced the resistance in an airduct road simultaneously, reduced the power consumption of primary air fan.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The schematic diagram of the combustion control system of the brown coal unit that Fig. 1 provides for prior art;
Fig. 2 is the schematic diagram of the combustion control system of brown coal unit provided by the invention;
Fig. 3 is the schematic diagram of the combustion control system of brown coal unit provided by the invention;
Fig. 4 is the schematic diagram of the combustion control system of brown coal unit provided by the invention;
Fig. 5 is the schematic diagram of the combustion control system of flue gas conditioning device provided by the invention;
Fig. 6 is the schematic diagram of the combustion control system of conditioner provided by the invention;
The flow chart of the method for controlling combustion of Fig. 7 brown coal unit provided by the invention.
The specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
Fig. 2 is the schematic diagram of the combustion control system of brown coal unit provided by the invention.Described system comprises: boiler 205, coal pulverizer 204, air preheater 206, dust removal machine 207, air-introduced machine 201, primary air fan 203, overfire air fan 202 and chimney 208; Wherein, coal pulverizer 204 is connected between 203 outlets of boiler 205 primary air fans, overfire air fan 202 outlets connect and boiler 205, in air preheater 206, realize the air preheat of flue, secondary air channel road, a wind pipeline enclosure, deduster 207 is connected between the flue and air-introduced machine 201 inlets of air preheater, and the outlet of air-introduced machine links to each other with chimney 208.
Described system also comprises: flue gas conditioning device 209;
Described flue gas conditioning device 209 is connected between described air-introduced machine 201 outlets and described primary air fan 203 inlets by flue, and the flue gas that air-introduced machine 201 is sent feeds back to described primary air fan 203 inlets;
Described primary air fan 203 mixes the flue gas of feedback with the air sent into of outside, and mist is sent into 205 pairs of brown coal of described boiler by described air preheater 206 and coal pulverizer 204 burns.
In the present embodiment, owing to have certain heat, obtain mist mixing by the air of sending in the outside from the flue gas of air-introduced machine feedback from the flue gas of air-introduced machine feedback.With respect to only using air as drier in the prior art, this example as drier, can utilize the heat of low-temperature flue gas that brown coal are carried out drying described mist, reduces the use amount of air.
In the present embodiment,, the fin of the flue gas in the boiler back end ductwork by inside will be entered air preheat before the boiler to uniform temperature, and help full combustion of fuel and improve the heat exchange performance of boiler, reduce energy consumption by air preheater 206.For energy-conservation, air preheat has great importance.
In the present embodiment, coal pulverizer 204 grinds described fuel and obtains coal dust, and it is in order to increase the surface area of fuel, to be used for more abundant burning that fuel is ground to form coal dust.
What overfire air fan 202 entered the mouth suction is air, is being for coal dust is burnt more fully to importing secondary wind again through the once air-dry dry coal dust later of mixing.
In the present embodiment, described flue gas conditioning device 209 is an adjustable plate, and this adjustable plate is regulated and entered ducted flue gas, that is to say, can regulate the shared ratio of flue gas in the described mist by this adjustable plate.Particularly, this adjustable plate can be for manually adjusting plate.This adjustable plate can also be regulated by PI (proportional integral) adjuster or PID (proportional integral feedforward) adjuster.For the those skilled in the art, under the prerequisite of the technology of technical field, common variation, change or replacement that this adjustable plate is carried out all should be included within protection scope of the present invention under grasping.
Beneficial effect of the present invention is, be connected between described air-introduced machine outlet and the described primary air fan inlet by flue by flue gas conditioning device, in a wind, mix a certain amount of flue gas, not only can reduce the use amount of a wind of boiler, and can be with NO
xBe controlled within the acceptability limit, owing to cancelled the steam air heater of a wind, reduced the resistance in an airduct road simultaneously, reduced the power consumption of primary air fan.
Embodiment two:
Fig. 3 is the schematic diagram of the combustion control system of brown coal unit provided by the invention.Described system comprises: boiler 305, coal pulverizer 304, air preheater 306, dust removal machine 307, air-introduced machine 301, primary air fan 303, overfire air fan 302 and chimney 308; Wherein, coal pulverizer 304 is connected between 303 outlets of boiler 305 primary air fans, overfire air fan 302 outlets connect and boiler 305, in air preheater 306, realize the air preheat of flue, secondary air channel road, a wind pipeline enclosure, deduster 307 is connected between the flue and air-introduced machine 301 inlets of air preheater, and the outlet of air-introduced machine links to each other with chimney 308.
Described system also comprises: flue gas conditioning device 309;
Described flue gas conditioning device 309 is connected between described air-introduced machine 301 outlets and described primary air fan 303 inlets by flue, and the flue gas that air-introduced machine 301 is sent feeds back to described primary air fan 303 inlets;
Described primary air fan 303 mixes the flue gas of feedback with the air sent into of outside, and mist is sent into 305 pairs of brown coal of described boiler by described air preheater 306 and coal pulverizer 304 burns.
In the present embodiment, owing to have certain heat, obtain mist mixing by the air of sending in the outside from the flue gas of air-introduced machine 301 feedbacks from the flue gas of air-introduced machine 301 feedbacks.With respect to only using air as drier in the prior art, this example as drier, can utilize the heat of low-temperature flue gas that brown coal are carried out drying described mist, reduces the use amount of air.
In the present embodiment,, the fin of the flue gas in the boiler back end ductwork by inside will be entered air preheat before the boiler to uniform temperature, and help full combustion of fuel and improve the heat exchange performance of boiler, reduce energy consumption by air preheater 306.For energy-conservation, air preheat has great importance.
In the present embodiment, coal pulverizer 304 grinds described fuel and obtains coal dust, and it is in order to increase the surface area of fuel, to be used for more abundant burning that fuel is ground to form coal dust.
What overfire air fan 302 entered the mouth suction is air, is being for coal dust is burnt more fully to importing secondary wind again through the once air-dry dry coal dust later of mixing.
In the present embodiment, described flue gas conditioning device 309 is an adjustable plate, and this adjustable plate is regulated and entered ducted flue gas, that is to say, can regulate the shared ratio of flue gas in the described mist by this adjustable plate.Particularly, this adjustable plate can be for manually adjusting plate.For the those skilled in the art, under the prerequisite of the technology of technical field, common variation, change or replacement that this adjustable plate is carried out all should be included within protection scope of the present invention under grasping.
Described system also comprises: oxygen sensor 310 is installed between described primary air fan 303 outlets and the air preheater 307, and is electrically connected with described flue gas conditioning device 309.Preferably, oxygen sensor 310 also can be connected to distribution control system (Distributed Control System, DCS) in, be used to control the total amount of the mixture of a wind air/flue gas, the ratio of air, flue gas is then regulated by the gas baffle that installs additional.
Preferably, as shown in Figure 4, described flue gas conditioning device 309 comprises: adjustable plate 3091 and adjustable plate controller 3092, described controller 3092 is electrically connected with described sensor 310, receives oxygen content signal that described oxygen sensor detects and according to described oxygen content signal described adjustable plate 3091 is controlled.Described adjustable plate controller 3092 can be adjuster or PID (proportional integral feedforward) adjuster.In actual applications, suppose when oxygen content is lower than a certain setting value, then open big baffle plate,, then close small front apron if instead the oxygen amount in the air quantity is higher than this value.For the those skilled in the art, under the prerequisite of the technology of technical field, common variation, change or replacement that flue gas conditioning device 309 is carried out all should be included within protection scope of the present invention under grasping.
Beneficial effect of the present invention is, be connected between described air-introduced machine outlet and the described primary air fan inlet by flue by flue gas conditioning device, in a wind, mix a certain amount of flue gas, not only can reduce the use amount of a wind of boiler, and can be with NO
xBe controlled within the acceptability limit, owing to cancelled the steam air heater of a wind, reduced the resistance in an airduct road simultaneously, reduced the power consumption of primary air fan.
Embodiment three:
Fig. 5 is the schematic diagram of the combustion control system of brown coal unit provided by the invention.Described system comprises: boiler 505, coal pulverizer 504, air preheater 506, dust removal machine 507, air-introduced machine 501, primary air fan 503, overfire air fan 502 and chimney 508; Wherein, coal pulverizer 504 is connected between 503 outlets of boiler 505 primary air fans, overfire air fan 502 outlets connect and boiler 505, in air preheater 506, realize the air preheat of flue, secondary air channel road, a wind pipeline enclosure, deduster 507 is connected between the flue and air-introduced machine 501 inlets of air preheater, and the outlet of air-introduced machine links to each other with chimney 508.
Described system also comprises: flue gas conditioning device 509;
Described flue gas conditioning device 509 is connected between described air-introduced machine 501 outlets and described primary air fan 503 inlets by flue, and the flue gas that air-introduced machine 501 is sent feeds back to described primary air fan 503 inlets;
Described primary air fan 503 mixes the flue gas of feedback with the air sent into of outside, and mist is sent into 505 pairs of brown coal of described boiler by described air preheater 506 and coal pulverizer 504 burns.
In the present embodiment, owing to have certain heat, obtain mist mixing by the air of sending in the outside from the flue gas of air-introduced machine 501 feedbacks from the flue gas of air-introduced machine 501 feedbacks.With respect to only using air as drier in the prior art, this example as drier, can utilize the heat of low-temperature flue gas that brown coal are carried out drying described mist, reduces the use amount of air.
In the present embodiment,, the fin of the flue gas in the boiler back end ductwork by inside will be entered air preheat before the boiler to uniform temperature, and help full combustion of fuel and improve the heat exchange performance of boiler, reduce energy consumption by air preheater 506.For energy-conservation, air preheat has great importance.
In the present embodiment, coal pulverizer 504 grinds described fuel and obtains coal dust, and it is in order to increase the surface area of fuel, to be used for more abundant burning that fuel is ground to form coal dust.
What overfire air fan 502 entered the mouth suction is air, is being for coal dust is burnt more fully to importing secondary wind again through the once air-dry dry coal dust later of mixing.
In the present embodiment, described flue gas conditioning device 509 is an adjustable plate, and this adjustable plate is regulated and entered ducted flue gas, that is to say, can regulate the shared ratio of flue gas in the described mist by this adjustable plate.Particularly, this adjustable plate can be for manually adjusting plate.For the those skilled in the art, under the prerequisite of the technology of technical field, common variation, change or replacement that this adjustable plate is carried out all should be included within protection scope of the present invention under grasping.
Described system also comprises: oxygen sensor 510 is installed between described primary air fan 503 outlets and the air preheater 507, and is electrically connected with described flue gas conditioning device 509.Preferably, oxygen sensor 510 also can be connected to distribution control system (Distributed Control System, DCS) in, be used to control the total amount of the mixture of a wind air/flue gas, the ratio of air, flue gas is then regulated by the gas baffle that installs additional.
Preferably, as shown in Figure 4, described flue gas conditioning device 309 comprises: adjustable plate 3091 and adjustable plate controller 3092, described controller 3092 is electrically connected with described sensor 310, receives oxygen content signal that described oxygen sensor detects and according to described oxygen content signal described adjustable plate 3091 is controlled.Described adjustable plate controller 3092 can be adjuster or PID (proportional integral feedforward) adjuster.In actual applications, suppose when oxygen content is lower than a certain setting value, then open big baffle plate,, then close small front apron if instead the oxygen amount in the air quantity is higher than this value.For the those skilled in the art, under the prerequisite of the technology of technical field, common variation, change or replacement that flue gas conditioning device 309 is carried out all should be included within protection scope of the present invention under grasping.
Described system also comprises: conditioner 511;
Described conditioner 511 is connected in described primary air fan 503 inlets by flue, the outside is sent into the air capacity of described primary air fan 503 and is regulated.
Preferably, as shown in Figure 6, described conditioner 511 comprises: adjustable plate 5111 and adjustable plate controller 5112, described adjustable plate controller 5112 is electrically connected with described sensor 503, receives oxygen content signal that described oxygen sensor 503 detects and according to described oxygen content signal described adjustable plate 5111 is controlled.
Particularly, the requirement of a wind total amount is by brown coal moisture decision, is that 40% brown coal are example with total moisture, if adopt pure air drying, need 50% primary air ratio, promptly dry 1t coal approximately needs 3～4t air, and the coal pulverizer outlet temperature can only arrive about 60 ℃.Adopt air/smoke mixture drying, because flue gas specific heat is big, it is smaller to reach the total amount that uniform temp needs, but because the amount of oxygen in the flue gas reduces, coal pulverizer requirement of explosion proof, outlet temperature can be brought up to 70～80 ℃.
Below to control primary air ratio specifically introduce:
1) total exhaust gas volumn/air capacity total amount and the primary air fan outlet oxygen amount according to the primary air fan outlet obtains a wind air capacity:
In the formula:
M
PrABe the air capacity in primary air fan outlet cigarette/empty mixture;
M
A﹠amp; GBe primary air fan outlet cigarette/empty amount of the mixture;
O
2, prABe the oxygen volume ratio in primary air fan outlet cigarette/empty mixture.
2) condition of based on fuel is determined the flow of the mixture of primary air and flue gas:
In the formula:
Max is big for getting;
M
CoalBe the quality of fuel flow, get the coal-supplying amount output of feeder;
K is a coal-air ratio control parameter, i.e. the ratio of the mass flow of a wind air/smoke mixture and coal-supplying amount, it is directly proportional with fuel quantity, roughly the coal pulverizer outlet temperature is controlled at 60～80 ℃ want within the scope;
M
MinMinimum air quantity for coal pulverizer can bear is determined by coal pulverizer itself.
3) adjusting of baffle plate is used to control the ratio between wind problem and the exhaust gas volumn, suppose that it was 12% (ratio of flue gas and air is about 1: 1 in the wind total amount of this moment), if air quantity oxygen amount is lower than this value, then open big baffle plate, if instead the oxygen amount in the air quantity is higher than this value, then close small front apron.An available PI or PID adjuster are regulated.
4) temperature that exports by coal pulverizer is accurately controlled the total amount of a wind and smoke mixture, calculate the total amount of a minimum wind and smoke mixture earlier by condition (2), carry out the initial value that PI regulates as fundamental line, if outlet temperature is low, the total amount of the total wind and smoke mixture of XXL, otherwise, then reduce the total amount of a wind and smoke mixture; If below minimum air quantity, the coal pulverizer outlet temperature is also high, then reduces and extracts exhaust gas volumn, no matter oxygen amount definite value.
Can fall the total amount of oxygen in wind get off by aforesaid operations, realized high moisture content brown coal fuel dry with burning, reduce NO
xTriple requirements.The wind temperature adjustment wind art designs at present commonly used of cancellation simultaneously makes an all wind all the time through the air preheater heat absorption, has guaranteed boiler efficiency.
Beneficial effect of the present invention is, be connected between described air-introduced machine outlet and the described primary air fan inlet by flue by flue gas conditioning device, in a wind, mix a certain amount of flue gas, not only can reduce the use amount of a wind of boiler, and can be with NO
xBe controlled within the acceptability limit, owing to cancelled the steam air heater of a wind, reduced the resistance in an airduct road simultaneously, reduced the power consumption of primary air fan.
Embodiment four:
The schematic diagram of the method for controlling combustion of Fig. 7 brown coal unit provided by the invention.Described method comprises:
S701: the flue gas that the air-introduced machine outlet is sent feeds back to the primary air fan inlet;
S702: described primary air fan mixes the flue gas of feedback with the air sent into of outside, and mist is sent into described boiler by air preheater and coal pulverizer brown coal are burnt.
In order to set forth the method that the embodiment of the invention provides in more detail.Herein, the combustion control system of the brown coal unit that please provides referring to Fig. 5.In the present embodiment, owing to have certain heat, obtain mist mixing by the air of sending in the outside from the flue gas of air-introduced machine 501 feedbacks from the flue gas of air-introduced machine 501 feedbacks.With respect to only using air as drier in the prior art, this example as drier, can utilize the heat of low-temperature flue gas that brown coal are carried out drying described mist, reduces the use amount of air.
In the present embodiment, described method also comprises: the oxygen content of the described mist that primary air fan is sent is checked, and according to described oxygen content the exhaust gas volumn that feeds back to the primary air fan inlet is regulated.
In the present embodiment, described method also comprises: the oxygen content of the described mist that primary air fan is sent is checked, and according to described oxygen content the air capacity that feeds back to the primary air fan inlet is regulated.
Described method also comprises: obtain the mist total amount of described primary air fan outlet, according to the ratio of described oxygen content and mist the exhaust gas volumn that feeds back to the primary air fan inlet is regulated.
Described method also comprises: obtain the air content in the mist of described primary air fan outlet, according to described air content the air capacity that feeds back to the primary air fan inlet is regulated.
Below to control primary air ratio specifically introduce:
1) total exhaust gas volumn/air capacity total amount and the primary air fan outlet oxygen amount according to the primary air fan outlet obtains a wind air capacity:
In the formula:
M
PrABe the air capacity in primary air fan outlet cigarette/empty mixture;
M
A﹠amp; GBe primary air fan outlet cigarette/empty amount of the mixture;
O
2, prABe the oxygen volume ratio in primary air fan outlet cigarette/empty mixture.
2) condition of based on fuel is determined the flow of the mixture of primary air and flue gas:
In the formula:
Max is big for getting;
M
CoalBe the quality of fuel flow, get the coal-supplying amount output of feeder;
K is a coal-air ratio control parameter, i.e. the ratio of the mass flow of a wind air/smoke mixture and coal-supplying amount, it is directly proportional with fuel quantity, roughly the coal pulverizer outlet temperature is controlled at 60～80 ℃ want within the scope;
M
MinMinimum air quantity for coal pulverizer can bear is determined by coal pulverizer itself.
3) adjusting of baffle plate is used to control the ratio between wind problem and the exhaust gas volumn, suppose that it was 12% (ratio of flue gas and air is about 1: 1 in the wind total amount of this moment), if air quantity oxygen amount is lower than this value, then open big baffle plate, if instead the oxygen amount in the air quantity is higher than this value, then close small front apron.An available PI or PID adjuster are regulated.
4) temperature that exports by coal pulverizer is accurately controlled the total amount of a wind and smoke mixture, calculate the total amount of a minimum wind and smoke mixture earlier by condition (2), carry out the initial value that PI regulates as fundamental line, if outlet temperature is low, the total amount of the total wind and smoke mixture of XXL, otherwise, then reduce the total amount of a wind and smoke mixture; If below minimum air quantity, the coal pulverizer outlet temperature is also high, then reduces and extracts exhaust gas volumn, no matter oxygen amount definite value.
Beneficial effect of the present invention is, be connected between described air-introduced machine outlet and the described primary air fan inlet by flue by flue gas conditioning device, in a wind, mix a certain amount of flue gas, not only can reduce the use amount of a wind of boiler, and can be with NO
xBe controlled within the acceptability limit, owing to cancelled the steam air heater of a wind, reduced the resistance in an airduct road simultaneously, reduced the power consumption of primary air fan.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, unit in the accompanying drawing or flow process might not be that enforcement the present invention is necessary.The invention described above embodiment sequence number is not represented the quality of embodiment just to description.
Above embodiment is the preferred embodiments of the disclosure, and the common variation that the those skilled in the art carries out in the technical scheme of the embodiment of the invention, change or replacement all should be included within protection scope of the present invention.
Claims (12)
1. the method for controlling combustion of a brown coal unit is characterized in that, described method comprises:
The flue gas that the air-introduced machine outlet is sent feeds back to the primary air fan inlet;
Described primary air fan mixes the flue gas of feedback with the air sent into of outside, and mist is sent into described boiler by air preheater and coal pulverizer brown coal are burnt.
2. the method for claim 1 is characterized in that, the oxygen content of the described mist that primary air fan is sent is checked, and according to described oxygen content the exhaust gas volumn that feeds back to the primary air fan inlet regulated.
3. the method for claim 1 is characterized in that, the oxygen content of the described mist that primary air fan is sent is checked, and according to described oxygen content the air capacity that feeds back to the primary air fan inlet regulated.
4. method as claimed in claim 2 is characterized in that, obtains the mist total amount of described primary air fan outlet, according to the ratio of described oxygen content and mist the exhaust gas volumn that feeds back to the primary air fan inlet is regulated.
5. method as claimed in claim 3 is characterized in that, obtains the air content in the mist of described primary air fan outlet, according to described air content the air capacity that feeds back to the primary air fan inlet is regulated.
6. the combustion control system of a brown coal unit, described system comprises: boiler, coal pulverizer, air preheater, dust removal machine, air-introduced machine, primary air fan, overfire air fan and chimney; It is characterized in that described system also comprises: flue gas conditioning device;
Described flue gas conditioning device is connected between described air-introduced machine outlet and the described primary air fan inlet by flue, and the flue gas that air-introduced machine is sent feeds back to described primary air fan inlet;
Described primary air fan mixes the flue gas of feedback with the air sent into of outside, and mist is sent into described boiler by described air preheater and coal pulverizer brown coal are burnt.
7. combustion control system as claimed in claim 6 is characterized in that described flue gas conditioning device comprises: adjustable plate.
8. combustion control system as claimed in claim 6 is characterized in that, described system also comprises: oxygen sensor is installed between described primary air fan outlet and the air preheater, and is electrically connected with described flue gas conditioning device.
9. combustion control system as claimed in claim 8, it is characterized in that, described flue gas conditioning device comprises: adjustable plate and adjustable plate controller, described controller is connected with described sensor electrical, receives oxygen content signal that described oxygen sensor detects and according to described oxygen content signal described adjustable plate is controlled.
10. combustion control system as claimed in claim 6 is characterized in that described system also comprises: conditioner;
Described conditioner is connected in described primary air fan inlet by flue, the outside is sent into the air capacity of described primary air fan and is regulated.
11. combustion control system as claimed in claim 10 is characterized in that, described system also comprises: oxygen sensor is installed between described primary air fan outlet and the air preheater, and is electrically connected with described conditioner.
12. combustion control system as claimed in claim 10, it is characterized in that, described conditioner comprises: adjustable plate and adjustable plate controller, described controller is connected with described sensor electrical, receives oxygen content signal that described oxygen sensor detects and according to described oxygen content signal described adjustable plate is controlled.
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Cited By (4)
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| CN102721068A (en) * | 2012-07-11 | 2012-10-10 | 光大环保科技发展（北京）有限公司 | Method for controlling air supply system of water-cooling reciprocating multistage hydraulic mechanical grate furnace |
| CN103292342A (en) * | 2013-05-31 | 2013-09-11 | 大唐甘谷发电厂 | Method for co-combusting Xinjiang Guanghui lignite in combusting bitumite boiler |
| CN105042630A (en) * | 2015-07-27 | 2015-11-11 | 中国神华能源股份有限公司 | Oxygen-supply control device and method of oxygen-enriched combustion system |
| CN106391284A (en) * | 2016-08-31 | 2017-02-15 | 珠海市华远自动化科技有限公司 | System for adjusting oxygen concentration in coal grinder and control method |
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| CN101294765B (en) * | 2008-06-05 | 2010-09-29 | 神华集团有限责任公司 | Low rank coal high temperature flue gas drying method and device |
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| CN102721068A (en) * | 2012-07-11 | 2012-10-10 | 光大环保科技发展（北京）有限公司 | Method for controlling air supply system of water-cooling reciprocating multistage hydraulic mechanical grate furnace |
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