CN105042630A - Oxygen-supply control device and method of oxygen-enriched combustion system - Google Patents
Oxygen-supply control device and method of oxygen-enriched combustion system Download PDFInfo
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- CN105042630A CN105042630A CN201510445422.4A CN201510445422A CN105042630A CN 105042630 A CN105042630 A CN 105042630A CN 201510445422 A CN201510445422 A CN 201510445422A CN 105042630 A CN105042630 A CN 105042630A
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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
Abstract
The invention relates to the field of automatic control and discloses an oxygen-supply control device and method of an oxygen-enriched combustion system. The control device comprises a measuring module and a processing module. During a switchover of the oxygen-enriched combustion system from an air combustion condition to an oxygen-enriched combustion condition, the measuring module is used for measuring oxygen flow rate supplied to a primary air re-circulating gas duct, oxygen flow rate supplied to a secondary air re-circulating gas duct, value of oxygen concentration in primary air mixed flue gas and value of oxygen concentration in secondary air mixed flue gas. The processing system is used for converting the oxygen flow rate supplied to the primary air re-circulating gas duct into first value of oxygen concentration and regulating an oxygen-injection regulation valve of the primary air re-circulating gas duct based on the first value of oxygen concentration and the value of oxygen concentration of the primary air mixed flue gas and also used for converting the oxygen flow rate supplied to the secondary air re-circulating gas duct into the second value of oxygen concentration and regulating an oxygen-injection regulation valve of the secondary air re-circulating gas duct based on the second value of oxygen concentration and the value of oxygen concentration of the secondary air mixed flue gas. The oxygen-supply control device and method of the oxygen-enriched combustion system are capable of rapidly and uniformly mixing high-concentration oxygen or pure oxygen and recycled flue gas according to the proportion required by boiler combustion.
Description
Technical field
The present invention relates to automation field, particularly, relate to a kind of oxygen-enriched combustion system oxygen supply control device and method.
Background technology
Oxygen-enriched combustion technology is that a kind of high-concentration oxygen higher than usual air (oxygen concentration 21%) oxygen concentration or pure oxygen replace air as the technology of the combustion adjuvant of fuel combustion, it is a kind of clean, energy-efficient combustion technology, can be applied in the fields such as the combustion power generation of the boilers such as pulverized-coal fired boiler.The flue gas that oxygen-enriched combustion technology utilizes flue gas recirculation system burning to be produced is mixed by the pure oxygen of recirculating gas duct and injection or high-concentration oxygen (oxygen concentration is greater than 21%) and replaces conventional boiler to burn the air used, both improve boiler thermal output like this, achieve CO again
2large-scale trapping with seal up for safekeeping and NO
xdeng the reduction of discharging of pollutant.
In the oxygen-enriched combustion system adopting oxygen-enriched combustion technology, oxygen supply subsystem is the subsystem very high with the stable operation of the boiler degree of association.This oxygen supply subsystem be related to oxygen generation system export high-purity oxygen can be supplied in recirculating gas duct safely, be also related to high-purity oxygen can with flue gas recycled Homogeneous phase mixing.In oxygen-enriched combustion system, in boiler, supply appropriate oxygen is ensure that boiler maintains the normal precondition run.If high-purity oxygen and flue gas recycled mix uneven, then the coal dust in low oxygen concentration district is difficult to catch fire, thus is difficult to the boiler ignition and steady combustion ensureing oxygen-enriched combustion system; The coal dust in high oxygen concentration district then can conflagration, thus cause local mixing volume rapid expanding, has had a strong impact on the security of economy and boiler.
Summary of the invention
The object of this invention is to provide a kind of oxygen-enriched combustion system oxygen supply control device and method, high-concentration oxygen or pure oxygen and flue gas recycled can be carried out Homogeneous phase mixing according to ratio needed for boiler combustion by this oxygen supply control device and method rapidly.
To achieve these goals, the invention provides a kind of oxygen-enriched combustion system oxygen supply control device, this control device comprises measurement module and processing module, and during described oxygen-enriched combustion system switches from air burning operating mode to oxygen-enriched combusting operating mode: described measurement module is for measuring the oxygen concentration value in the oxygen flow supplied to First air recirculating gas duct, the oxygen flow supplied in Secondary Air recirculating gas duct, First air mixed flue gas and the oxygen concentration value in Secondary Air mixed flue gas; Described processing module is used for converting the oxygen flow supplied in First air recirculating gas duct measured by described measurement module to first oxygen concentration value and notes oxygen valve door according to the oxygen concentration value in described first oxygen concentration value and described First air mixed flue gas to regulate First air recirculating gas duct, and converts the oxygen flow supplied in Secondary Air recirculating gas duct measured by described measurement module to second oxygen concentration value and note oxygen valve door according to the oxygen concentration value in described second oxygen concentration value and described Secondary Air mixed flue gas to regulate Secondary Air recirculating gas duct.
The present invention also provides a kind of oxygen-enriched combustion system oxygen supplying control method, and this control method is included in during described oxygen-enriched combustion system switches from air burning operating mode to oxygen-enriched combusting operating mode and performs following steps: measure the oxygen concentration value in the oxygen flow supplied to First air recirculating gas duct, the oxygen flow supplied in Secondary Air recirculating gas duct, First air mixed flue gas and the oxygen concentration value in Secondary Air mixed flue gas; And convert the described oxygen flow supplied in First air recirculating gas duct to first oxygen concentration value and note oxygen valve door according to the oxygen concentration value in described first oxygen concentration value and described First air mixed flue gas to regulate First air recirculating gas duct, and convert the described oxygen flow supplied in Secondary Air recirculating gas duct to second oxygen concentration value and note oxygen valve door according to the oxygen concentration value in described second oxygen concentration value and described Secondary Air mixed flue gas to regulate Secondary Air recirculating gas duct.
Pass through technique scheme, can convert the described oxygen flow supplied in First air recirculating gas duct to first oxygen concentration value due to oxygen supply control device according to the present invention and method and regulate according to the oxygen concentration value in described first oxygen concentration value and described First air mixed flue gas First air recirculating gas duct to note oxygen valve door and convert the described oxygen flow supplied in Secondary Air recirculating gas duct to second oxygen concentration value and regulate Secondary Air recirculating gas duct to note oxygen valve door according to the oxygen concentration value in described second oxygen concentration value and described Secondary Air mixed flue gas, therefore high-concentration oxygen or pure oxygen and flue gas recycled can be carried out Homogeneous phase mixing according to ratio needed for boiler combustion by rapidly.
Other features and advantages of the present invention are described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for description, is used from explanation the present invention, but is not construed as limiting the invention with detailed description of the invention one below.In the accompanying drawings:
Fig. 1 is the schematic block diagram of the oxygen-enriched combustion system oxygen supply control device according to one embodiment of the present invention; And
Fig. 2 is the flow chart of the oxygen-enriched combustion system oxygen supplying control method according to one embodiment of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.Should be understood that, detailed description of the invention described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
As shown in Figure 1, the invention provides a kind of oxygen-enriched combustion system oxygen supply control device, this control device comprises measurement module 10 and processing module 20, and during described oxygen-enriched combustion system switches from air burning operating mode to oxygen-enriched combusting operating mode: described measurement module 10 is for measuring the oxygen concentration value in the oxygen flow supplied to First air recirculating gas duct, the oxygen flow supplied in Secondary Air recirculating gas duct, First air mixed flue gas and the oxygen concentration value in Secondary Air mixed flue gas; Described processing module 20 for converting the oxygen flow supplied in First air recirculating gas duct measured by described measurement module 10 to first oxygen concentration value and noting oxygen valve door according to the oxygen concentration value in described first oxygen concentration value and described First air mixed flue gas to regulate First air recirculating gas duct, and converts the oxygen flow supplied in Secondary Air recirculating gas duct measured by described measurement module 10 to second oxygen concentration value and notes oxygen valve door according to the oxygen concentration value in described second oxygen concentration value and described Secondary Air mixed flue gas to regulate Secondary Air recirculating gas duct.This oxygen supply control device can make high-concentration oxygen or pure oxygen mix in ratio needed for boiler combustion with flue gas recycled, thus ensure to provide the oxygen amount matched with boiler load in the boiler of oxygen-enriched combustion system, and supplied high-concentration oxygen or pure oxygen can be mixed with flue gas recycled within the extremely short time, thus the stable operation of oxygen-enriched combustion system can be realized.
For First air recirculating gas duct note oxygen valve door, the adjustment action performed by processing module 20 is explained below: during described oxygen-enriched combustion system switches from air burning operating mode to oxygen-enriched combusting operating mode, processing module 20 is by function g
1x () converts the oxygen flow supplied in First air recirculating gas duct measured by measurement module 10 to first oxygen concentration value signal, then by function of time g
1the first oxygen concentration value signal t () makes conversion after forms the signal changed with combustion conditions switching time, then regulate First air recirculating gas duct to note oxygen valve door according to the oxygen concentration value in this signal and First air mixed flue gas, such as, first the oxygen concentration value in this signal and First air mixed flue gas is formed deviation and then by PID adjuster process carried out to this deviation and regulate First air recirculating gas duct to note oxygen valve door according to result.Wherein g
1t () is the function that the first oxygen concentration value signal after conversion changes with the change of combustion conditions switching time, it can adjust according to the actual conditions of oxygen-enriched combustion system.
In addition, the oxygen flow supplied in First air recirculating gas duct, the oxygen flow supplied in Secondary Air recirculating gas duct can preferably record respectively after the First air recirculating gas duct note oxygen valve door of First air recirculating gas duct and the Secondary Air recirculating gas duct note oxygen valve door of Secondary Air recirculating gas duct.Oxygen concentration value in First air mixed flue gas and the oxygen concentration value in the Secondary Air mixed flue gas position preferably respectively near boiler inlet in First air recirculating gas duct and Secondary Air recirculating gas duct records, because in these positions, flue gas recycled mixes with high-concentration oxygen or pure oxygen, thus the oxygen concentration value during First air mixed flue gas more accurately can be obtained and the oxygen concentration value in Secondary Air mixed flue gas.
And, at oxygen-enriched combustion system from air burning operating mode to after oxygen-enriched combusting operating mode has switched, the wind and smoke combustion subsystem of oxygen-enriched combustion system also needs the flue gas recirculation through after a while, and the high-efficiency low energy consumption that could realize carbon dioxide with the state (70% ~ 80% or higher) making the carbon dioxide in flue gas be enriched to higher concentration is gradually caught.Before this, unnecessary flue gas (flue gas outside the flue gas namely injected to First air recirculating gas duct and Secondary Air recirculating gas duct) is whole smoke stack emissions.The continuous increase of oxygen-supplying amount in what this one-phase was adjoint is First air recirculating gas duct and Secondary Air recirculating gas duct, until stable equilibrium.Namely in order to ensure the stable operation of oxygen-enriched combustion system, First air recirculating gas duct note oxygen valve door and Secondary Air recirculating gas duct note oxygen valve door are opened gradually.Therefore, in order to carry out oxygen supply control better, what select measurement here is the oxygen flow supplied in First air recirculating gas duct and the oxygen flow supplied in Secondary Air recirculating gas duct.
Moreover be switched to oxygen-enriched burning under oxygen-enriched combusting operating mode during stable operation until oxygen-enriched combustion system is stable, oxygen concentration value in First air recirculating gas duct and Secondary Air recirculating gas duct is determined by boiler load, and the oxygen concentration value also namely now in First air recirculating gas duct and Secondary Air recirculating gas duct can be stabilized in relatively-stationary value.Therefore, preferably, during described oxygen-enriched combustion system is in oxygen-enriched combusting operating mode, described measurement module 10 is further used for measuring the oxygen concentration value under oxygen-enriched combusting operating mode in described First air mixed flue gas and the oxygen concentration value in described Secondary Air mixed flue gas, described processing module 20 is for regulating according to the oxygen concentration value in this First air mixed flue gas and First air oxygen concentration setting value described First air recirculating gas duct to note oxygen valve door and noting oxygen valve door according to the oxygen concentration value in this Secondary Air mixed flue gas and Secondary Air oxygen concentration setting value to regulate described Secondary Air recirculating gas duct.
Preferably, no matter be during described oxygen-enriched combustion system switches from air burning operating mode to oxygen-enriched combusting operating mode or during oxygen-enriched combustion system is in oxygen-enriched combusting operating mode, described measurement module 10 is all further used for measuring the oxygen concentration value at boiler export place, described processing module 20 when regulating described Secondary Air recirculating gas duct note oxygen valve door also according to the oxygen concentration value at described boiler export place.Also be, during described oxygen-enriched combustion system switches from air burning operating mode to oxygen-enriched combusting operating mode, processing module 20 notes oxygen valve door according to the oxygen concentration value of the oxygen concentration value in the second oxygen concentration value be converted to from the oxygen flow supplied in Secondary Air recirculating gas duct, Secondary Air mixed flue gas and boiler export to regulate Secondary Air recirculating gas duct; During oxygen-enriched combustion system is in oxygen-enriched combusting operating mode, processing module 20 regulates Secondary Air recirculating gas duct to note oxygen valve door according to the oxygen concentration value at the oxygen concentration value in Secondary Air mixed flue gas, Secondary Air oxygen concentration setting value and boiler export place.Oxygen-enriched combusting operating mode is in for oxygen-enriched combustion system, processing module 20 can first to the oxygen concentration value in measured Secondary Air mixed flue gas and Secondary Air oxygen concentration setting value carry out deviation calculating, using the oxygen concentration value at measured boiler export place after differential as feed-forward signal, after the computing of PID adjuster, namely obtain the regulating command of Secondary Air recirculating gas duct note oxygen valve door.Like this, when regulating Secondary Air recirculating gas duct note oxygen valve door, by being taken into account by the combustion position of boiler (such as, boiler whether Thorough combustion etc.), oxygen-supplying amount can be changed rapidly when the oxygen concentration value at boiler export place changes greatly.
Preferably, no matter be during described oxygen-enriched combustion system switches from air burning operating mode to oxygen-enriched combusting operating mode or during oxygen-enriched combustion system is in oxygen-enriched combusting operating mode, described processing module 20 is all further used for the oxygen concentration value in described First air mixed flue gas and the oxygen concentration higher limit in First air mixed flue gas and the oxygen concentration lower limit in First air mixed flue gas to compare, and the oxygen concentration value in described First air mixed flue gas is preferentially impelled when being greater than the oxygen concentration higher limit in described First air mixed flue gas described First air recirculating gas duct to note oxygen valve door to close, oxygen concentration value in described First air mixed flue gas preferentially makes the oxygen concentration value in described First air mixed flue gas reach the first setting value by regulating described First air recirculating gas duct note oxygen valve door when being less than the oxygen concentration lower limit in described First air mixed flue gas, and described processing module 20 is further used for the oxygen concentration value in described Secondary Air mixed flue gas and the oxygen concentration higher limit in Secondary Air mixed flue gas and the oxygen concentration lower limit in Secondary Air mixed flue gas to compare, and preferentially the oxygen concentration value in described Secondary Air mixed flue gas is made to reach described first setting value by regulating described Secondary Air recirculating gas duct note oxygen valve door during preferentially impel described Secondary Air recirculating gas duct to note when the oxygen concentration value in described Secondary Air mixed flue gas is greater than the oxygen concentration higher limit in described Secondary Air mixed flue gas oxygen valve door is closed, oxygen concentration value in described Secondary Air mixed flue gas is less than in described Secondary Air mixed flue gas oxygen concentration lower limit.Such as, during described oxygen-enriched combustion system switches from air burning operating mode to oxygen-enriched combusting operating mode, if the oxygen concentration value in First air mixed flue gas is greater than the oxygen concentration higher limit in described First air mixed flue gas, then processing module 20 directly impels First air recirculating gas duct note oxygen valve door to close rapidly, instead of note oxygen valve door according to the oxygen concentration value in the first oxygen concentration value be converted to from the oxygen flow supplied to First air recirculating gas duct and measured First air mixed flue gas to regulate First air recirculating gas duct, like this, just can cut off oxygen supply rapidly when there is unsafe condition, ensure that the security of oxygen-enriched combustion system.Again such as, time during described oxygen-enriched combustion system is in oxygen-enriched combusting operating mode, if the oxygen concentration value in First air mixed flue gas is less than the oxygen concentration lower limit in First air mixed flue gas, then processing module 20 preferentially makes the oxygen concentration value in described First air mixed flue gas reach the first setting value (such as by regulating described First air recirculating gas duct note oxygen valve door, 21%), instead of progressively regulate described First air recirculating gas duct to note oxygen valve door according to the oxygen concentration value in measured First air mixed flue gas and First air oxygen concentration setting value, also when the oxygen concentration value namely in First air recirculating gas duct is too low, processing module 20 can regulate First air recirculating gas duct note oxygen valve door to reach such as 21% to impel the oxygen concentration value in First air recirculating gas duct immediately, this makes it possible to ensure the burner of oxygen-enriched combustion system and the normal operation of boiler.
Preferably, no matter be during described oxygen-enriched combustion system switches from air burning operating mode to oxygen-enriched combusting operating mode or during oxygen-enriched combustion system is in oxygen-enriched combusting operating mode, described processing module 20 is all further used for the oxygen concentration value at described boiler export place and boiler export place oxygen concentration higher limit and boiler export place oxygen concentration lower limit to compare.Like this, just can avoid occurring boiler overfire or insufficient situation of burning.
Preferably, oxygen-enriched combustion system oxygen supply control device according to the present invention can also comprise alarm module 30, for reporting to the police in a case where: the oxygen concentration value in described First air mixed flue gas is greater than the oxygen concentration higher limit in described First air mixed flue gas, oxygen concentration value in described First air mixed flue gas is less than the oxygen concentration lower limit in described First air mixed flue gas, oxygen concentration value in described Secondary Air mixed flue gas is greater than the oxygen concentration higher limit in described Secondary Air mixed flue gas, oxygen concentration value in described Secondary Air mixed flue gas is less than the oxygen concentration lower limit in described Secondary Air mixed flue gas, the oxygen concentration value that the oxygen concentration value at described boiler export place is greater than described boiler export place oxygen concentration higher limit and described boiler export place is less than described boiler export place oxygen concentration lower limit.Like this, staff just can learn rapidly the dangerous working condition of oxygen-enriched combustion system and take appropriate measures in time.Such as, if the oxygen concentration value in described Secondary Air mixed flue gas is greater than the oxygen concentration higher limit in described Secondary Air mixed flue gas, then now the oxygen of high concentration mixes with coal dust and can more easily blast, if and the oxygen concentration value in described Secondary Air mixed flue gas is lower than the oxygen concentration lower limit in described Secondary Air mixed flue gas, coal dust firing then can be caused insufficient, and this not only can cause waste but also does not burn or do not have clean-burning coal dust to be deposited in the risk that can cause detonation in boiler; Therefore, all need in these cases to report to the police, so that take appropriate measures in time.
Preferably, oxygen-enriched combustion system oxygen supply control device according to the present invention can also comprise the communication interface communicated with distribution type control system, this control device just can to distribution type control system transmission of information like this, can receive the information relevant to the situation such as oxygen supply control, boiler combustion to make distribution type control system and thus can take measures on customs clearance rapidly and accurately.
Preferably, control module 20 can adopt PID adjuster to note oxygen valve door and Secondary Air recirculating gas duct note oxygen valve door to regulate First air recirculating gas duct.
The present invention also provides a kind of oxygen-enriched combustion system oxygen supplying control method, and this control method is included in during described oxygen-enriched combustion system switches from air burning operating mode to oxygen-enriched combusting operating mode and performs following steps:
S1, measure the oxygen concentration value in the oxygen flow supplied in First air recirculating gas duct, the oxygen flow supplied in Secondary Air recirculating gas duct, First air mixed flue gas and the oxygen concentration value in Secondary Air mixed flue gas; And
S2, convert the described oxygen flow supplied in First air recirculating gas duct to first oxygen concentration value and note oxygen valve door according to the oxygen concentration value in described first oxygen concentration value and described First air mixed flue gas to regulate First air recirculating gas duct, and convert the described oxygen flow supplied in Secondary Air recirculating gas duct to second oxygen concentration value and note oxygen valve door according to the oxygen concentration value in described second oxygen concentration value and described Secondary Air mixed flue gas to regulate Secondary Air recirculating gas duct.
For First air recirculating gas duct note oxygen valve door, step S2 is explained below: during described oxygen-enriched combustion system switches from air burning operating mode to oxygen-enriched combusting operating mode, the measured oxygen flow supplied in First air recirculating gas duct is by function g
1x () converts the first oxygen concentration value signal to, the first oxygen concentration value signal after conversion is by function of time g
1t () forms the signal changed with combustion conditions switching time, then regulate First air recirculating gas duct to note oxygen valve door according to the oxygen concentration value in this signal and First air mixed flue gas, such as, first the oxygen concentration value in this signal and First air mixed flue gas is formed deviation and then by PID adjuster process carried out to this deviation and regulate First air recirculating gas duct to note oxygen valve door according to result.Wherein g
1t () is the function that the first oxygen concentration value signal after conversion changes with the change of combustion conditions switching time, it can adjust according to the actual conditions of oxygen-enriched combustion system.
Preferably, oxygen supplying control method according to the present invention comprises further: during described oxygen-enriched combustion system is in described oxygen-enriched combusting operating mode, measure the oxygen concentration value in First air mixed flue gas and the oxygen concentration value in Secondary Air mixed flue gas, and regulate described First air recirculating gas duct to note oxygen valve door according to the oxygen concentration value in this First air mixed flue gas and First air oxygen concentration setting value and note oxygen valve door according to the oxygen concentration value in this Secondary Air mixed flue gas and Secondary Air oxygen concentration setting value to regulate described Secondary Air recirculating gas duct.
Preferably, no matter be during described oxygen-enriched combustion system switches from air burning operating mode to oxygen-enriched combusting operating mode or during oxygen-enriched combustion system is in oxygen-enriched combusting operating mode, oxygen supplying control method according to the present invention comprises all further: the oxygen concentration value measuring boiler export place; And when regulating described Secondary Air recirculating gas duct note oxygen valve door also according to the oxygen concentration value at described boiler export place.Also be, during described oxygen-enriched combustion system switches from air burning operating mode to oxygen-enriched combusting operating mode, the oxygen concentration value according to the oxygen concentration value in the second oxygen concentration value be converted to from the oxygen flow supplied in Secondary Air recirculating gas duct, Secondary Air mixed flue gas and boiler export notes oxygen valve door to regulate Secondary Air recirculating gas duct; During oxygen-enriched combustion system is in oxygen-enriched combusting operating mode, the oxygen concentration value according to the oxygen concentration value in Secondary Air mixed flue gas, Secondary Air oxygen concentration setting value and boiler export place regulates Secondary Air recirculating gas duct to note oxygen valve door.Like this, when regulating Secondary Air recirculating gas duct note oxygen valve door, also the combustion position of boiler (such as, boiler whether Thorough combustion etc.) being taken into account, thus oxygen-supplying amount can be changed rapidly when the oxygen concentration value at boiler export place changes greatly.Oxygen-enriched combusting operating mode is in for oxygen-enriched combustion system, first to the oxygen concentration value in measured Secondary Air mixed flue gas and Secondary Air oxygen concentration setting value carry out deviation calculating, using the oxygen concentration value at measured boiler export place after differential as feed-forward signal, after the computing of PID adjuster, namely obtain the regulating command of Secondary Air recirculating gas duct note oxygen valve door.Like this, when regulating Secondary Air recirculating gas duct note oxygen valve door, by being taken into account by the combustion position of boiler (such as, boiler whether Thorough combustion etc.), oxygen-supplying amount can be changed rapidly when the oxygen concentration value at boiler export place changes greatly.
Preferably, no matter be during described oxygen-enriched combustion system switches from air burning operating mode to oxygen-enriched combusting operating mode or during oxygen-enriched combustion system is in oxygen-enriched combusting operating mode, this control method comprises all further: the oxygen concentration value in described First air mixed flue gas and the oxygen concentration higher limit in First air mixed flue gas and the oxygen concentration lower limit in First air mixed flue gas are compared, and the oxygen concentration value in described First air mixed flue gas is preferentially impelled when being greater than the oxygen concentration higher limit in described First air mixed flue gas described First air recirculating gas duct to note oxygen valve door to close, oxygen concentration value in described First air mixed flue gas preferentially makes the oxygen concentration value in described First air mixed flue gas reach the first setting value by regulating described First air recirculating gas duct note oxygen valve door when being less than the oxygen concentration lower limit in described First air mixed flue gas, and the oxygen concentration value in described Secondary Air mixed flue gas and the oxygen concentration higher limit in Secondary Air mixed flue gas and the oxygen concentration lower limit in Secondary Air mixed flue gas are compared, and preferentially the oxygen concentration value in described Secondary Air mixed flue gas is made to reach described first setting value by regulating described Secondary Air recirculating gas duct note oxygen valve door during preferentially impel described Secondary Air recirculating gas duct to note when the oxygen concentration value in described Secondary Air mixed flue gas is greater than the oxygen concentration higher limit in described Secondary Air mixed flue gas oxygen valve door is closed, oxygen concentration value in described Secondary Air mixed flue gas is less than in described Secondary Air mixed flue gas oxygen concentration lower limit.Such as, during described oxygen-enriched combustion system switches from air burning operating mode to oxygen-enriched combusting operating mode, if the oxygen concentration value in First air mixed flue gas is greater than the oxygen concentration higher limit in described First air mixed flue gas, then directly impel First air recirculating gas duct to note oxygen valve door to close rapidly, instead of note oxygen valve door according to the oxygen concentration value in the first oxygen concentration value be converted to from the oxygen flow supplied to First air recirculating gas duct and First air mixed flue gas to regulate First air recirculating gas duct, like this, just can cut off oxygen supply rapidly when there is unsafe condition, ensure that the security of oxygen-enriched combustion system.Again such as, time during described oxygen-enriched combustion system is in oxygen-enriched combusting operating mode, if the oxygen concentration value in First air mixed flue gas is less than the oxygen concentration lower limit in First air mixed flue gas, then preferential passing through regulates described First air recirculating gas duct note oxygen valve door and makes the oxygen concentration value in described First air mixed flue gas reach the first setting value (such as, 21%), instead of progressively regulate described First air recirculating gas duct to note oxygen valve door according to the oxygen concentration value in First air mixed flue gas and First air oxygen concentration setting value, also when the oxygen concentration value namely in First air recirculating gas duct is too low, First air recirculating gas duct can be regulated to note oxygen valve door according to control method of the present invention and reach such as 21% to impel the oxygen concentration value in First air recirculating gas duct immediately, this makes it possible to ensure the burner of oxygen-enriched combustion system and the normal operation of boiler.
Preferably, no matter be during described oxygen-enriched combustion system switches from air burning operating mode to oxygen-enriched combusting operating mode or during oxygen-enriched combustion system is in oxygen-enriched combusting operating mode, control method according to the present invention comprises all further: the oxygen concentration value at described boiler export place and boiler export place oxygen concentration higher limit and boiler export place oxygen concentration lower limit are compared.Like this, just can avoid occurring boiler overfire or insufficient situation of burning.
Preferably, also comprise according to control method of the present invention and reporting to the police in a case where: the oxygen concentration value in described First air mixed flue gas is greater than the oxygen concentration higher limit in described First air mixed flue gas, oxygen concentration value in described First air mixed flue gas is less than the oxygen concentration lower limit in described First air mixed flue gas, oxygen concentration value in described Secondary Air mixed flue gas is greater than the oxygen concentration higher limit in described Secondary Air mixed flue gas, oxygen concentration value in described Secondary Air mixed flue gas is less than the oxygen concentration lower limit in described Secondary Air mixed flue gas, the oxygen concentration value that the oxygen concentration value at described boiler export place is greater than described boiler export place oxygen concentration higher limit and described boiler export place is less than described boiler export place oxygen concentration lower limit.Like this, staff just can learn rapidly the dangerous working condition of oxygen-enriched combustion system and take appropriate measures in time.Such as, if the oxygen concentration value in described Secondary Air mixed flue gas is greater than the oxygen concentration higher limit in described Secondary Air mixed flue gas, then now the oxygen of high concentration mixes with coal dust and can more easily blast, if and the oxygen concentration value in described Secondary Air mixed flue gas is lower than the oxygen concentration lower limit in described Secondary Air mixed flue gas, coal dust firing then can be caused insufficient, and this not only can cause waste but also does not burn or do not have clean-burning coal dust to be deposited in the risk that can cause detonation in boiler; Therefore, all need in these cases to report to the police, so that take appropriate measures in time.
Below the preferred embodiment of the present invention is described in detail by reference to the accompanying drawings; but; the present invention is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
In addition, also can be combined between various different embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (12)
1. an oxygen-enriched combustion system oxygen supply control device, this control device comprises measurement module and processing module, and during described oxygen-enriched combustion system switches from air burning operating mode to oxygen-enriched combusting operating mode:
Described measurement module is for measuring the oxygen concentration value in the oxygen flow supplied in First air recirculating gas duct, the oxygen flow supplied in Secondary Air recirculating gas duct, First air mixed flue gas and the oxygen concentration value in Secondary Air mixed flue gas;
Described processing module is used for converting the oxygen flow supplied in First air recirculating gas duct measured by described measurement module to first oxygen concentration value and notes oxygen valve door according to the oxygen concentration value in described first oxygen concentration value and described First air mixed flue gas to regulate First air recirculating gas duct, and converts the oxygen flow supplied in Secondary Air recirculating gas duct measured by described measurement module to second oxygen concentration value and note oxygen valve door according to the oxygen concentration value in described second oxygen concentration value and described Secondary Air mixed flue gas to regulate Secondary Air recirculating gas duct.
2. control device according to claim 1, wherein, during described oxygen-enriched combustion system is in described oxygen-enriched combusting operating mode, described measurement module is further used for measuring the oxygen concentration value under oxygen-enriched combusting operating mode in described First air mixed flue gas and the oxygen concentration value in described Secondary Air mixed flue gas, described processing module is used for regulating described First air recirculating gas duct to note oxygen valve door according to the oxygen concentration value in this First air mixed flue gas and First air oxygen concentration setting value and noting oxygen valve door according to the oxygen concentration value in this Secondary Air mixed flue gas and Secondary Air oxygen concentration setting value to regulate described Secondary Air recirculating gas duct.
3. control device according to claim 2, wherein, described measurement module is further used for measuring the oxygen concentration value at boiler export place, described processing module when regulating described Secondary Air recirculating gas duct note oxygen valve door also according to the oxygen concentration value at described boiler export place.
4. control device according to claim 3, wherein, described processing module is further used for the oxygen concentration value in described First air mixed flue gas and the oxygen concentration higher limit in First air mixed flue gas and the oxygen concentration lower limit in First air mixed flue gas to compare, and the oxygen concentration value in described First air mixed flue gas is preferentially impelled when being greater than the oxygen concentration higher limit in described First air mixed flue gas described First air recirculating gas duct to note oxygen valve door to close, oxygen concentration value in described First air mixed flue gas preferentially makes the oxygen concentration value in described First air mixed flue gas reach the first setting value by regulating described First air recirculating gas duct note oxygen valve door when being less than the oxygen concentration lower limit in described First air mixed flue gas, and
Described processing module is further used for the oxygen concentration value in described Secondary Air mixed flue gas and the oxygen concentration higher limit in Secondary Air mixed flue gas and the oxygen concentration lower limit in Secondary Air mixed flue gas to compare, and preferentially makes the oxygen concentration value in described Secondary Air mixed flue gas reach described first setting value by regulating described Secondary Air recirculating gas duct note oxygen valve door during preferentially impel described Secondary Air recirculating gas duct to note when the oxygen concentration value in described Secondary Air mixed flue gas is greater than the oxygen concentration higher limit in described Secondary Air mixed flue gas oxygen valve door is closed, oxygen concentration value in described Secondary Air mixed flue gas is less than in described Secondary Air mixed flue gas oxygen concentration lower limit.
5. control device according to claim 4, wherein, described processing module is further used for the oxygen concentration value at described boiler export place and boiler export place oxygen concentration higher limit and boiler export place oxygen concentration lower limit to compare; And
This control device also comprises alarm module, for reporting to the police in a case where: the oxygen concentration value in described First air mixed flue gas is greater than the oxygen concentration higher limit in described First air mixed flue gas, oxygen concentration value in described First air mixed flue gas is less than the oxygen concentration lower limit in described First air mixed flue gas, oxygen concentration value in described Secondary Air mixed flue gas is greater than the oxygen concentration higher limit in described Secondary Air mixed flue gas, oxygen concentration value in described Secondary Air mixed flue gas is less than the oxygen concentration lower limit in described Secondary Air mixed flue gas, the oxygen concentration value that the oxygen concentration value at described boiler export place is greater than described boiler export place oxygen concentration higher limit and described boiler export place is less than described boiler export place oxygen concentration lower limit.
6. control device according to claim 5, wherein, described first setting value is 21%.
7. the control device according to claim arbitrary in claim 1 to 6, this control device also comprises the communication interface communicated with distribution type control system.
8. an oxygen-enriched combustion system oxygen supplying control method, this control method is included in during described oxygen-enriched combustion system switches from air burning operating mode to oxygen-enriched combusting operating mode and performs following steps:
Measure the oxygen concentration value in the oxygen flow supplied in First air recirculating gas duct, the oxygen flow supplied in Secondary Air recirculating gas duct, First air mixed flue gas and the oxygen concentration value in Secondary Air mixed flue gas; And
Convert the described oxygen flow supplied in First air recirculating gas duct to first oxygen concentration value and note oxygen valve door according to the oxygen concentration value in described first oxygen concentration value and described First air mixed flue gas to regulate First air recirculating gas duct, and convert the described oxygen flow supplied in Secondary Air recirculating gas duct to second oxygen concentration value and note oxygen valve door according to the oxygen concentration value in described second oxygen concentration value and described Secondary Air mixed flue gas to regulate Secondary Air recirculating gas duct.
9. control method according to claim 8, wherein, during described oxygen-enriched combustion system is in described oxygen-enriched combusting operating mode, this control method comprises further:
Measure the oxygen concentration value in described First air mixed flue gas and the oxygen concentration value in described Secondary Air mixed flue gas; And
Regulate described First air recirculating gas duct to note oxygen valve door according to the oxygen concentration value in this First air mixed flue gas and First air oxygen concentration setting value and note oxygen valve door according to the oxygen concentration value in this Secondary Air mixed flue gas and Secondary Air oxygen concentration setting value to regulate described Secondary Air recirculating gas duct.
10. control method according to claim 9, this control method comprises further:
Measure the oxygen concentration value at boiler export place; And
When regulating described Secondary Air recirculating gas duct note oxygen valve door also according to the oxygen concentration value at described boiler export place.
11. control methods according to claim 10, wherein, this control method comprises further:
Oxygen concentration value in described First air mixed flue gas and the oxygen concentration higher limit in First air mixed flue gas and the oxygen concentration lower limit in First air mixed flue gas are compared, and the oxygen concentration value in described First air mixed flue gas is preferentially impelled when being greater than the oxygen concentration higher limit in described First air mixed flue gas described First air recirculating gas duct to note oxygen valve door to close, oxygen concentration value in described First air mixed flue gas preferentially makes the oxygen concentration value in described First air mixed flue gas reach the first setting value by regulating described First air recirculating gas duct note oxygen valve door when being less than the oxygen concentration lower limit in described First air mixed flue gas, and
Oxygen concentration value in described Secondary Air mixed flue gas and the oxygen concentration higher limit in Secondary Air mixed flue gas and the oxygen concentration lower limit in Secondary Air mixed flue gas are compared, and preferentially makes the oxygen concentration value in described Secondary Air mixed flue gas reach described first setting value by regulating described Secondary Air recirculating gas duct note oxygen valve door during preferentially impel described Secondary Air recirculating gas duct to note when the oxygen concentration value in described Secondary Air mixed flue gas is greater than the oxygen concentration higher limit in described Secondary Air mixed flue gas oxygen valve door is closed, oxygen concentration value in described Secondary Air mixed flue gas is less than in described Secondary Air mixed flue gas oxygen concentration lower limit.
12. control methods according to claim 11, this control method comprises further:
The oxygen concentration value at described boiler export place and boiler export place oxygen concentration higher limit and boiler export place oxygen concentration lower limit are compared; And
Report to the police in a case where: the oxygen concentration value in described First air mixed flue gas is greater than the oxygen concentration higher limit in described First air mixed flue gas, oxygen concentration value in described First air mixed flue gas is less than the oxygen concentration lower limit in described First air mixed flue gas, oxygen concentration value in described Secondary Air mixed flue gas is greater than the oxygen concentration higher limit in described Secondary Air mixed flue gas, oxygen concentration value in described Secondary Air mixed flue gas is less than the oxygen concentration lower limit in described Secondary Air mixed flue gas, the oxygen concentration value that the oxygen concentration value at described boiler export place is greater than described boiler export place oxygen concentration higher limit and described boiler export place is less than described boiler export place oxygen concentration lower limit.
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