CN1313765C - Method for controlling burning state of coal powder boiler fire - Google Patents
Method for controlling burning state of coal powder boiler fire Download PDFInfo
- Publication number
- CN1313765C CN1313765C CNB2005100098176A CN200510009817A CN1313765C CN 1313765 C CN1313765 C CN 1313765C CN B2005100098176 A CNB2005100098176 A CN B2005100098176A CN 200510009817 A CN200510009817 A CN 200510009817A CN 1313765 C CN1313765 C CN 1313765C
- Authority
- CN
- China
- Prior art keywords
- nozzles
- coal
- boiler
- communicated
- secondary air
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Regulation And Control Of Combustion (AREA)
Abstract
The present invention discloses a method for controlling a flame combustion state of a pulverized coal boiler used for a fuel electric plant. The method for controlling flame combustion state of a pulverized coal boiler comprises the following steps: setting a specified value Sp of fume oxygen content Pv at the boiler outlet; measuring actual fume oxygen content Pv in the boiler; calculating the deviation e1 between the actual fume oxygen content and the specified value, and calculating a specified value of secondary air total amount according to an outer ring controller; judging whether a powder making device is running; distributing the secondary air total amount to layered nozzles according to a proportion of beta 1: beta 2:...: beta n from top to bottom if the powder making device is running; distributing the secondary air total amount to the layered nozzles according to a proportion of beta 1': beta 2':...: beta n' from top to bottom if the powder making device is not running; adjusting each secondary air door to make the air quantity of each nozzle outlet track the specified value. The air distribution and adjustment of the present invention is accurate and quick, and no manpower is needed.
Description
Technical field:
The present invention relates to the control method of the employed pulverized-coal fired boiler in a kind of thermal power plant.
Background technology:
The air distribution of pulverized-coal fired boiler (total air-supply, wind, secondary wind, tertiary air) directly influences the state of the fire combustion burning in the burner hearth, the i.e. size of the shape of fire combustion, upright position, horizontal level and fire combustion cross section tangential circle diameter.For making boiler be in best fired state, when requiring boiler operatiopn in theory, the shape of fire combustion should be the rotation circle of contact, and ignition point keeps suitable distance apart from nozzles, and the horizontal level of fire combustion combustion centre is on the central axis of burner hearth, and the upright position remains unchanged.Therefore, when the operating condition of adjusting boiler load or boiler changes, must adjust the aperture of total air supply port and each secondary air register in time, exactly, coordinate the ratio between total air output and the secondary air flow, keep best fiery burning state.But, the present overwhelming majority of the blowing system of boiler is in manual operation, as adjusting air distribution, need manually to adjust simultaneously the aperture of tens air doors, operation easier is big, the height of adjusting frequency, adjustment process is slow, even need the repeated multiple times adjustment just can reach stable state, if regulate improper, the danger of the blowing out of putting out a fire in addition.So the stoker of present 95% above power plant does not carry out the proportioning of boiler secondary air and regulates, only regulate total blast volume to satisfy the demand that boiler load is adjusted.But only regulate total blast volume and can bring following problem: the burner hearth central axis can be departed from the fire of (1) boiler combustion center, cross section, causes the boiler water wall inequality of being heated, booster when serious.(2) along with the adjustment of boiler load and the variation of operating condition, the upper and lower fluctuation of burner hearth interior fire combustion combustion centre is bigger, and is bigger to main stripping temperature influence, and main stripping temperature control is difficult.(3) fire of boiler combustion burning shape is not the rotation circle of contact of standard, but the oval circle of contact, and the ignition point distance of each nozzles does not wait, and the nozzles that ignition point is near often burn because overheated for a long time; Though the nozzles security of operation that ignition point is far away, the heat exchange efficiency of the water-cooling wall around it reduces.
Summary of the invention:
The purpose of this invention is to provide a kind of air distribution adjustment and accurately, fast and do not need the artificial method for controlling burning state of coal powder boiler fire that participates in, it is big that it has solved manual adjustment air distribution operation easier, the height of adjusting frequency, and adjustment process is shortcoming slowly.The system of this method indication comprises total air door, the total blast volume measurement mechanism, the tertiary air door, fuel pulverizing plant, powder process wind pressure measurement device, coal-powder boiler and a plurality of secondary air register, a plurality of apparatus for measuring air quantity and a plurality of nozzles, one end of total air door is communicated with an end of total blast volume measurement mechanism, one end of one end of the other end connection tertiary air door of total blast volume measurement mechanism and all secondary air registers, the other end of tertiary air door is communicated with an end of powder process wind pressure measurement device, the other end of powder process wind pressure measurement device is communicated with an end of fuel pulverizing plant, the other end of fuel pulverizing plant is communicated with in the coal-powder boiler, the other end of each secondary air register all is communicated with an apparatus for measuring air quantity, the other end of each apparatus for measuring air quantity all is communicated with an end of nozzles, the other end of each nozzles all is communicated with in coal-powder boiler, per four nozzles are arranged on the place, four angles of the same horizontal cross-section of coal-powder boiler as one deck, the multilayer nozzles are arranged along the short transverse of coal-powder boiler, the control method that it is characterized in that fiery burning state is as follows: one, beginning, giving the cigarette oxygen content assignment in the stove is Sp; Two, measure the interior actual cigarette oxygen content Pv of stove, calculate the deviation e of cigarette oxygen content
1=Sp-Pv; Three, calculate secondary wind total amount V=f (e
1, con1); Four, differentiate whether normally operation of fuel pulverizing plant; If "No", program jump to step 5, secondary wind total amount β proportionally from top to bottom
1': β
2': ... β
n' distribute to each layer nozzles; If the result of step 4 is a "Yes", program jumps to step 6, secondary wind total amount β proportionally from top to bottom
1: β
2: ... β
nDistribute to each layer nozzles; Seven, calculate each layer secondary air flow set-point P
i=β
i* V; Measure then, eight, the actual secondary air flow P of each nozzles of each layer
In', calculate the air quantity deviation e of each nozzles
2in=P
i-P
In'; Nine, calculate the aperture Fmkd of each secondary air register of each layer
i=f
2(e
2i, con2i); Execute the starting end that returns step 2 behind the said process.
The present invention can distribute to secondary wind gross demand with total air output demand of coal-powder boiler real-time dynamicly according to operation process and burden requirement; Whether secondary wind total amount is moved according to fuel pulverizing plant, distributed to each layer nozzles, and control exports air quantity and follows the tracks of its set-point; Its advantage is the security that (1) has improved boiler operatiopn.Do not adopt the pulverized-coal fired boiler of this technology, its fire combustion 8 horizontal cross sectional geometry are oval, fire combustion misalignment burner hearth vertical centre axis, cause the coal-powder boiler water-cooling wall 5-1 inequality of being heated, overheated even the generation booster of local water-cooling wall when serious, or burn nozzles 13, cause the blowing out of putting out a fire.After adopting present technique, fire combustion burning is shaped as the rotation circle of contact, and the circle of contact is even, and on each vertical aspect, the circle of contact is centered close on the burner hearth vertical centre axis, and therefore, each water-cooling wall of whole burner hearth is heated evenly, and the local overheating phenomenon can not take place; In addition, the fire of each nozzles combustion ignition point is evenly distributed, and distance suitably stops to burn the accident generation of nozzles.(2) improved the heat exchange efficiency of coal-powder boiler.Total air-supply is only adjusted in conventional boiler wind speed adjustment control, does not adjust secondary wind, and the fire combustion is shaped as ellipse.For preventing water-cooling wall local overheating booster, can only reduce fire combustion burning radius, the ignition point of nozzles is far away, and the water-cooling wall heat exchange efficiency is low.Adopt present technique, do not worry water-cooling wall local overheating booster problem, can suitably enlarge fire combustion burning radius, increase the heat exchange efficiency of water-cooling wall, and then improve boiler efficiency.(3) improved the stability of main stripping temperature.The main stripping temperature of coal-powder boiler is a key parameter of weighing unit operation, directly influences steam turbine efficient and steam turbine safety.Conventional boiler wind speed adjustment control is not because of adjusting the distribution of secondary wind, and the tertiary air of fuel pulverizing plant is very big to fire combustion influence in the burner hearth.When fuel pulverizing plant started, tertiary air entered burner hearth, and fiery combustion center moves down, and exit gas temperature reduces; When fuel pulverizing plant stopped, tertiary air disappeared, and moved exit gas temperature rising (fiery combustion center directly influences the boiler export flue-gas temperature, and the boiler export flue-gas temperature is bigger to main stripping temperature influence) in the fire combustion in the heart.After adopting present technique, according to fuel pulverizing plant start and stop working conditions change, adjust of the distribution of secondary wind automatically in vertical direction, cut down the influence that tertiary air distributes to air quantity in the burner hearth, make fiery combustion center relatively stable, eliminated the influence of fuel pulverizing plant start and stop main stripping temperature in vertical direction.The method according to this invention is compiled into computer program, adjusts, controls fiery burning state automatically according to this program, and the air distribution adjustment accurately, fast and does not need artificial participation, has advantage reasonable in design, reliable operation, has bigger promotional value.
Description of drawings:
Fig. 1 is a structural representation of the present invention, and Fig. 2 is the A-A cutaway view of Fig. 1, and Fig. 3 is the flow chart of the inventive method.
The specific embodiment:
The specific embodiment one: specify present embodiment below in conjunction with Fig. 1 to Fig. 3.The system of the method indication of present embodiment is by total air door 1, total blast volume measurement mechanism 2, tertiary air door 3, fuel pulverizing plant 4, powder process wind pressure measurement device 7, coal-powder boiler 5 and a plurality of secondary air register 11, a plurality of apparatus for measuring air quantity 12 and a plurality of nozzles 13 are formed, one end of total air door 1 is communicated with an end of total blast volume measurement mechanism 2, one end of one end of the other end connection tertiary air door 3 of total blast volume measurement mechanism 2 and all secondary air registers 11, the other end of tertiary air door 3 is communicated with an end of powder process wind pressure measurement device 7, the other end of powder process wind pressure measurement device 7 is communicated with an end of fuel pulverizing plant 4, the other end of fuel pulverizing plant 4 is communicated with in the coal-powder boiler 5, the other end of each secondary air register 11 all is communicated with an apparatus for measuring air quantity 12, the other end of each apparatus for measuring air quantity 12 all is communicated with an end of nozzles 13, the other end of each nozzles 13 all is communicated with in coal-powder boiler 5, per four nozzles 13 are arranged on the place, four angles of coal-powder boiler 5 same horizontal cross-sections as one deck, multilayer nozzles 13 are arranged along the short transverse of coal-powder boiler, the control method of fire burning state is as follows: one, beginning, giving the cigarette oxygen content assignment in the stove is Sp 101; Two, measure the interior actual cigarette oxygen content Pv of stove, calculate the deviation e of cigarette oxygen content
1=Sp-Pv 102; Three, by deviation e
1With the Mathematical Modeling con1 of cigarette oxygen content and secondary wind aggregate relation, calculate secondary wind total amount V=f (e
1, con1) 103; Four, calculate end, differentiate fuel pulverizing plant and whether normally move 104; If "No", program jump to step 5, secondary wind total amount β proportionally from top to bottom
1': β
2': ... β
n' distribute to each layer nozzles; If the result of step 4 is a "Yes", program jumps to step 6, secondary wind total amount β proportionally from top to bottom
1: β
2: ... β
nDistribute to each layer nozzles; Seven, according to the allocation proportion of secondary wind, the air quantity that each layer secondary wind should reach should be P
i, calculate each layer secondary air flow set-point P
i=β
i* V 107; Eight, measure the actual secondary air flow P of each nozzles of each layer
In', calculate the air quantity deviation e of each nozzles
2in=P
i-P
In' 108; Nine, by secondary air flow and the Mathematical Modeling con2i of throttle opening relation and the deviation e of actual secondary air flow and given secondary air flow
2i, calculate the aperture Fmkdi=f of each secondary air register of each layer
2(e
2i, con2i) 109; Execute the starting end that returns step 2 behind the said process, carry out next round control; Be positioned at the circumferencial direction that all is tangential to fire combustion 8 horizontal cross-sections with the air draft direction of four nozzles 13 of one deck, just setting completed when coal-powder boiler 5 dispatches from the factory for the number of plies that the angle of nozzles 13, position and nozzles 13 distribute and distribution distance, so in step 105, secondary wind total amount allocation proportion β 1 ' from top to bottom: β 2 ': ... β n ' just also determines when dispatching from the factory after tested; Ratio beta 1 in the step 106: β 2: ... β n is also tested back definite according to the air draft position and the exhaust air rate of fuel pulverizing plant 4 in coal-powder boiler 5.If fuel pulverizing plant starts, produce tertiary air, then the upper furnace air quantity increases, and at this moment can suitably reduce the upper furnace secondary air flow, the variation of the upper furnace air distribution amount that the increase of counteracting tertiary air quantity causes keeps relative stability boiler wind speed adjustment before and after fuel pulverizing plant starts.In the present embodiment, if fuel pulverizing plant stops, tertiary air disappears, then the upper furnace air quantity reduces, at this moment can suitably increase the upper furnace secondary air flow, the variation of the upper furnace air distribution amount that the disappearance of compensation tertiary air quantity causes keeps relative stability boiler wind speed adjustment before and after fuel pulverizing plant stops.If boiler load increases or reduces, cause total secondary air flow changes in demand, this changes in demand is distributed to the set-point of each layer secondary air flow in a certain ratio (this ratio is according to the boiler factory setting).This method can guarantee effectively that burner hearth fire combustion central vertical direction is relatively stable, and then reaches the effect of stablizing main stripping temperature.The set-point mean allocation of each layer secondary air flow is given the set-point that exports air quantity with each angle secondary air register in the layer.This method can effectively be controlled burner hearth fire combustion combustion centre and be on the burner hearth central axis on each horizontal bedding, and then it is even to reach the burner hearth fire combustion circle of contact, and water-cooling wall is heated evenly.Above-mentioned secondary wind is oxygen containing air, and through the hyperthermic treatment of air preheater, a wind is the air that carries coal dust before entering coal-powder boiler.The devices of measuring the cigarette oxygen contents in the coal-powder boiler 6 are scandium oxide measuring instruments, and the cigarette oxygen content refers to that oxygen in the flue gas at boiler furnace outlet place accounts for the percentage of flue gas.
Claims (1)
1, method for controlling burning state of coal powder boiler fire, the system of this method indication comprises total air door (1), total blast volume measurement mechanism (2), tertiary air door (3), fuel pulverizing plant (4), powder process wind pressure measurement device (7), coal-powder boiler (5) and a plurality of secondary air register (11), a plurality of apparatus for measuring air quantity (12) and a plurality of nozzles (13), one end of total air door (1) is communicated with an end of total blast volume measurement mechanism (2), one end of one end of the other end connection tertiary air door (3) of total blast volume measurement mechanism (2) and all secondary air registers (11), the other end of tertiary air door (3) is communicated with an end of powder process wind pressure measurement device (7), the other end of powder process wind pressure measurement device (7) is communicated with an end of fuel pulverizing plant (4), the other end of fuel pulverizing plant (4) is communicated with in the coal-powder boiler (5), the other end of each secondary air register (11) all is communicated with an apparatus for measuring air quantity (12), the other end of each apparatus for measuring air quantity (12) all is communicated with an end of nozzles (13), the other end of each nozzles (13) all is communicated with in coal-powder boiler (5), per four nozzles (13) are arranged on the place, four angles of the same horizontal cross-section of coal-powder boiler (5) as one deck, multilayer nozzles (13) are arranged along the short transverse of coal-powder boiler, the control method that it is characterized in that fiery burning state is as follows: one, beginning, giving the cigarette oxygen content assignment in the stove is Sp (101); Two, measure the interior actual cigarette oxygen content Pv of stove, calculate the deviation e of cigarette oxygen content
1=Sp-Pv (102); Three, calculate secondary wind total amount V=f (e
1, conl) (103); Four, differentiate whether normally operation (104) of fuel pulverizing plant; If "No", program jump to step 5, secondary wind total amount β proportionally from top to bottom
1': β
2': ... β
n' distribute to each layer nozzles (105); If the result of step 4 is a "Yes", program jumps to step 6, secondary wind total amount β proportionally from top to bottom
1: β
2: ... β
nDistribute to each layer nozzles (106); Seven, calculate each layer secondary air flow set-point P
i=β
i* V (107); Measure then, eight, the actual secondary air flow P of each nozzles of each layer
In', calculate the air quantity deviation e of each nozzles
2in=P
i-P
In' (108); Nine, calculate the aperture Fmkd of each secondary air register of each layer
i=f
2(e
2i, con2i) (109); Execute the starting end that returns step 2 behind the said process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100098176A CN1313765C (en) | 2005-03-14 | 2005-03-14 | Method for controlling burning state of coal powder boiler fire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100098176A CN1313765C (en) | 2005-03-14 | 2005-03-14 | Method for controlling burning state of coal powder boiler fire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1683832A CN1683832A (en) | 2005-10-19 |
| CN1313765C true CN1313765C (en) | 2007-05-02 |
Family
ID=35263263
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100098176A Expired - Fee Related CN1313765C (en) | 2005-03-14 | 2005-03-14 | Method for controlling burning state of coal powder boiler fire |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1313765C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101943396A (en) * | 2010-09-29 | 2011-01-12 | 神华集团有限责任公司 | Combustion control method and combustion control system of pulverized-fuel boiler |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7581945B2 (en) * | 2005-11-30 | 2009-09-01 | General Electric Company | System, method, and article of manufacture for adjusting CO emission levels at predetermined locations in a boiler system |
| CN101943397B (en) * | 2010-09-29 | 2012-08-22 | 神华集团有限责任公司 | Control system for pulverized coal boiler system |
| CN102853419A (en) * | 2012-08-29 | 2013-01-02 | 北京和隆优化控制技术有限公司 | Intelligent optimization control system of pulverized coal furnace |
| CN103807852B (en) * | 2014-03-13 | 2016-03-23 | 青岛立宇科技开发有限公司 | The secondary-wind distributing device of pulverized-coal fired boiler and Secondary Air air distribution method |
| CN104006408B (en) * | 2014-06-09 | 2016-07-13 | 盐城工学院 | A kind of control method of low nitrogen burning for fire coal boiler |
| CN106247396B (en) * | 2016-08-25 | 2018-11-20 | 河北思路科技有限公司 | A kind of control system of burner optimization burning |
| CN106287803B (en) * | 2016-08-25 | 2018-07-13 | 河北思路科技有限公司 | A kind of burner optimal control method and device |
| CN109084324B (en) * | 2018-07-19 | 2019-09-27 | 北京德普新源科技发展有限公司 | The burning air quantity control system and control method of biomass boiler |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1483184A1 (en) * | 1987-10-19 | 1989-05-30 | Сибирский Филиал Всесоюзного Научно-Исследовательского Теплотехнического Института Им.Ф.Э.Дзержинского | Method of controlling combustion process in pulverized-coal fired boiler |
| CN1479037A (en) * | 2003-07-08 | 2004-03-03 | 华中科技大学 | Control method of burning process of garbage incinerator |
| CN1525100A (en) * | 2003-09-16 | 2004-09-01 | 甘肃省电力试验研究所 | Composite type multifunctional straight-flow combustor |
-
2005
- 2005-03-14 CN CNB2005100098176A patent/CN1313765C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1483184A1 (en) * | 1987-10-19 | 1989-05-30 | Сибирский Филиал Всесоюзного Научно-Исследовательского Теплотехнического Института Им.Ф.Э.Дзержинского | Method of controlling combustion process in pulverized-coal fired boiler |
| CN1479037A (en) * | 2003-07-08 | 2004-03-03 | 华中科技大学 | Control method of burning process of garbage incinerator |
| CN1525100A (en) * | 2003-09-16 | 2004-09-01 | 甘肃省电力试验研究所 | Composite type multifunctional straight-flow combustor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101943396A (en) * | 2010-09-29 | 2011-01-12 | 神华集团有限责任公司 | Combustion control method and combustion control system of pulverized-fuel boiler |
| CN101943396B (en) * | 2010-09-29 | 2012-05-23 | 神华集团有限责任公司 | Combustion control method and combustion control system of pulverized-fuel boiler |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1683832A (en) | 2005-10-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1313765C (en) | Method for controlling burning state of coal powder boiler fire | |
| CN104266190B (en) | oxygen enrichment flameless gas burner and control method thereof | |
| CN105387458A (en) | System and method for reducing emission of oxynitride of combustion equipment | |
| CN104235849A (en) | Grading oxygen-enriched flameless combustion gas burner and control method thereof | |
| CN204084374U (en) | Oxygen enrichment flameless gas burner | |
| CN103968371A (en) | Electric combustion boiler and SOFA (separated over fire air) adjustment method based on numerical simulation technique | |
| CN103134049A (en) | Multi-corner tangential multi-scale pulverized coal decoupling combustion device and decoupling combustion method thereof | |
| CN103939939A (en) | Digitized combustion control and optimization method and system for pulverized coal boiler | |
| CN103672886A (en) | Local oxygen-enriched combustor for cement kiln furnace | |
| CN110043801A (en) | A kind of crude oil heater and its control system | |
| CN103994423B (en) | A kind of controllable boiler of burning circle of contact | |
| CN107238101A (en) | A kind of wind powder mixing temperature and flow velocity secondary regulation system | |
| CN103688107A (en) | Zonal mapping for combustion optimization | |
| CN109611844A (en) | A kind of fractional combustion natural gas combustion nozzle and its application method | |
| CN111780106A (en) | Flameless burner of steel rolling heating furnace and application thereof | |
| CN105509035B (en) | A kind of method, apparatus and automatic control system of determining opposed firing intake | |
| CN104214777B (en) | The gas utensil of full premix combustion | |
| CN101691930A (en) | Output power control method of combustion apparatus | |
| CN101775483B (en) | Heat accumulative roller bottom heating furnace | |
| CN204084375U (en) | Classification oxygen enrichment flameless combustion fuel burner nozzle | |
| CN207247265U (en) | A kind of wind powder mixing temperature and flow velocity secondary regulation system | |
| CN203703959U (en) | Cement kiln local oxygen-enriched combustor | |
| CN102221285A (en) | Vertical smoke heating furnace | |
| CN212006730U (en) | Refining smelting furnace DCS control system | |
| CN205838912U (en) | A kind of coke oven combustion chamber segmentation supply heater |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070502 Termination date: 20200314 |