CN1888530A - Coal combustion boiler unit consumption measuring and calculating method based on DCS - Google Patents
Coal combustion boiler unit consumption measuring and calculating method based on DCS Download PDFInfo
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- CN1888530A CN1888530A CN 200610012877 CN200610012877A CN1888530A CN 1888530 A CN1888530 A CN 1888530A CN 200610012877 CN200610012877 CN 200610012877 CN 200610012877 A CN200610012877 A CN 200610012877A CN 1888530 A CN1888530 A CN 1888530A
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Abstract
A based-on DCS coal-fired boiler unit consumption guess and estimate method includes the following steps of using the main steam flow and the steam bag pressure to compute the heat signal and using the oxygen content of the smoke to compute the heat efficiency of the boiler by means of the real-time computation function; and then determining the total energy released by the fuel and thus computing the average low heat value of the fuel; at last estimating the unit consumption target of the boiler.
Description
Technical field
The invention belongs to the field of boilers of Thermal Power Engineering, particularly a kind of coal-burning boiler unit consumption calculation method based on DCS.
Background technology
For coal-burning boiler (comprising station boiler), calculate its unit consumption and generally realize: the integration initial value of the main steam flow amount when 1) writing down on-test, generated energy, Coal-fired capacity by following test procedure; 2) at set intervals, regularly be taken into the stove coal sample, mix, encapsulate; The accumulated value of the primary air amount when 3) the record test stops, generated energy, Coal-fired capacity; 4) the low level generated energy of coal sample is got by assay office, and asks for the mean value of each coal sample low heat valve; 5) calculate main vapour output, the coal consumption of experimental stage; 6), coal consumption is converted into mark consumption of coal amount by average low heat valve.With said method measuring and calculating boiler unit consumption, there is the bigger drawback of ature of coal measure error, and time-consuming is longer, obtaining the result needs just can finish a working day at least, and therefore a lot of units do not do above-mentioned proper unit consumption measuring and calculating, but pass over the ature of coal quality, directly calculate vapour coal consumption per ton, there is error inevitably, is difficult to instruct boiler economic operation, be unfavorable for carrying out of energy-saving and cost-reducing work with science data.
Summary of the invention
Whether technical problem to be solved by this invention provides a kind of operation of evaluation coal-burning boiler that can science economical, the space that whether has the energy-saving and cost-reducing technological transformation of further enforcement, and the coal-burning boiler unit consumption measuring method that calculates in real time according to the operational factor of boiler based on DCS.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of coal-burning boiler unit consumption measuring method based on DCS, it is by means of the real-time computing function of DCS, utilize main steam flow amount, drum pressure to calculate heat signal, and calculate boiler thermal output by flue gas oxygen content, determine the gross energy that fuel discharges then, calculate the average low heat valve of fuel thus, finally calculate the unit consumption index of boiler; Its concrete grammar step is as follows:
(1) calculate heat signal:
A. at first be determined by experiment the heat storage coefficient C of boiler
b
Normally in service at boiler, keep fuel quantity and air quantity constant, at t=t
0Constantly, increase the steam flow that boiler provides to the user fast, the Changing Pattern that the monitored picture on the active station shows below: main steam flow amount progressively increases, increase to peak after, slowly descend again, finally return to t=t
0Flow value constantly, meanwhile, drum pressure descends again and again, and finally is stabilized in a certain numerical value, and this moment, experiment finished, record start, dwell time, and,, calculate heat storage coefficient C in conjunction with relevant engineering manual according to the historical trend recording curve
b
B. according to main steam flow amount D, drum pressure P
b, heat storage coefficient C
b, ask for heat signal by following formula (1):
D
Q (reality)=D+ (C
bS/ (1+T
dS)) P
b-(T
dS/ (1+T
dS)) D (1)
Wherein:
D
Q (reality)---the heat signal that adopts actual differential to ask for, Kg/s
D---main steam flow amount, Kg/s
P
b---drum pressure, MPa
C
b---heat storage coefficient, Kg/MPa
T
d---get constant 1
On the graphical configuration software of DCS, select actual differential module, multiplier module, addition module, subtraction block, can be earlier by asking for P
bActual differential, again with C
bMultiply each other,, deduct the actual differential value of D at last, promptly obtain heat signal D again with main steam flow amount D addition
Q (reality)
(2) thermal efficiency of calculating boiler:
A. look into engineering manual, determine under the boiler declared working condition Enthalpy of Feed Water h
sWith the numerical value of superheated steam enthalpy h ', and manually compute out h=h '-h
s, and calculate total caloric receptivity Qr according to following formula (2);
Qr=D
Q (reality)(h '-h
s) (2)
Wherein:
Total caloric receptivity of Qr---vapour pressure production process, KJ/s
D
Q (reality)---the heat signal that adopts actual differential to ask for, Kg/s
H '---superheated steam enthalpy, KJ/Kg
h
s---Enthalpy of Feed Water, KJ/Kg
On the graphical configuration software of DCS, select multiplier module, ask for h '-h
sWith D
Q (reality)Product, promptly obtain the numerical value of Qr;
B. set up furnace outlet excess air coefficient a
LWith the relation curve of heat loss, and obtain a according to following formula (3)
LAnd further draw boiler three big heat loss sum q by testing and tabling look-up
2+ q
3+ q
4:
a
L＝21/(21-O
2) (3)
Wherein:
a
L---the furnace outlet excess air factor
21---oxygen content in the air, %
O
2---flue gas oxygen content, %
For above-mentioned formula (3), on the graphical configuration software of DCS, select subtraction block, obtain 21 and O
2Difference, again with the division module ask 21 with the result of being divided by of above-mentioned difference, obtain a
L
Boiler is carried out anti-balance efficiency measure,, determine the furnace outlet excess air coefficient respectively and be 1.1,1.15,1.25,1.3,1.35,1.4,1.45,1.5 o'clock boiler three big heat loss q by the coal-air ratio adjustment
2, q
3, q
4, and set up excess air coefficient and q
2+ q
3+ q
4The corresponding relation chart, and on the configuration interface of DCS with broken line table definition above-mentioned corresponding relation, use lookup table mode, calculate the pairing q of special air excess coefficient in real time by the DCS system
2+ q
3+ q
4
C. calculate the thermal efficiency of boiler according to following formula (4):
η＝100-q
2-q
3-q
4-q
5-q
6 (4)
Wherein:
q
2---heat loss due to exhaust gas accounts for the ratio into the stove heat;
q
3---heat loss due to unburned gas accounts for the ratio into the stove heat;
q
4---heat loss due to combustibles in refuse accounts for the ratio into the stove heat;
q
5---the heat radiation heat loss accounts for the ratio into the stove heat;
q
6---lime-ash physics sensible heat heat loss and cooling water heat loss account for the ratio into the stove heat;
Wherein, q
5By the acquisition of tabling look-up, be a known constant, q
6Get 0.5-1, be known constant, in the graphical configuration software of DCS, excess air coefficient a
LAs the input of defined broken line table module of above-mentioned (b) step, broken line table module output q
2+ q
3+ q
4The measuring and calculating value, use subtraction block again, calculate the numerical value of efficiency eta;
(3) boiler unit consumption H
dCalculating:
A. calculate the total amount of heat Q of boiler input by following formula (5)
z:
Q
z＝MQ
ar·net＝Qr/ηψ
1 (5)
Wherein:
Total caloric receptivity of Qr---vapour pressure production process, KJ/s
M---fuel flow rate, Kg/s
Q
Arnet---the low heat valve of fuel As-received, KJ/Kg
η---boiler thermal output, %
ψ
1---working medium caloric receptivity accounts for the boiler share that always recepts the caloric, %
On the graphical configuration software of DCS, at first define ψ
1Be a variable, and artificial assignment, ask for ψ with multiplier module then
1With the product of η, use the division module again, ask for Qr and ψ
1* η phase division result promptly obtains Q
z, and ask for Q with accumulator module
zAccumulated value Q '
z, and as the gross energy of a certain section time boiler input, and with Q '
zOn flow chart, show;
B. according to the artificial interior average low heat valve Q ' of section sometime that calculates of following formula (6)
Arnet:
Q′
ar·net＝Q′
z/M′ (6)
Wherein,
Q '
Arnet---the average low heat valve of fuel As-received, KJ/Kg
M '---go into stove fuel quantity, Kg in the section sometime; M ' obtains by measurement means;
Q '
z---the gross energy of the boiler input of same time period, KJ; Q '
zObtain by observation on the active station;
C. according to the artificial mark coal consumption amount M that calculates of following formula (7)
b:
M
b=(Q '
Arnet/ Q
Standard coal) * M ' (7)
Wherein:
M
b---a certain section interior standard coal consumption of time, Kg
Q '
Arnet---the average low heat valve of fuel As-received, KJ/Kg
Go into stove fuel quantity, Kg in M '---a certain period
Q
Standard coal---the caloric value of standard coal, KJ/Kg
D. manually calculate boiler unit consumption H according to following formula (8)
d:
H
d＝M
b/D
z (8)
Wherein:
H
d---boiler unit consumption, Kg/kg
M
b---a certain section interior mark coal consumption amount of time, Kg
D
z---the total amount of steaming of the boiler in a certain period, Kg;
Described ψ
1Definite method be: can suppose ψ earlier
1=0.8, by repeatedly calculating average low heat valve Q '
Arnet, and compare with the coal burning caloricity of actual laboratory chemical examination, finally revise ψ
1, make it reasonable value.
The present invention calculates in real time by means of DCS (Distributed Control System), Distributed Control System (DCS) integrates information technology, microprocessor technology, control technology, network technology, be current very ripe for calculating control system, in this system, can carry out work such as system configuration, flow chart making, report making, control conceptual design and system debug, maintenance, the main steam flow amount of boiler, drum pressure, flue gas oxygen content by carrying out I/O point configuration on DCS, and are connected to relevant I/O fastener with corresponding transmitter output line; And on flow chart, increase the display module of three kinds of signals, main steam flow amount, drum pressure, flue gas oxygen content can be shown in real time, when configuration, note main steam flow amount is carried out accumulation process, and on flow chart, main steam flow amount accumulated value is shown simultaneously.Main steam flow amount, drum pressure, flue gas oxygen content are carried out the configuration historical record, so just the change trend curve of three kinds of signals of monitoring on active station.
The invention has the beneficial effects as follows: whether the operation of the evaluation coal-burning boiler that it can science is economical, whether has the space of the energy-saving and cost-reducing technological transformation of further enforcement, helps the energy-saving and cost-reducing work of industries such as the electric power and the energy.
The specific embodiment
According to the technical scheme in the foregoing invention content part,, can calculate the unit consumption H of coal-burning boiler easily by means of DCS in conjunction with the operational factor of concrete boiler
d
Claims (2)
1, based on the coal-burning boiler unit consumption measuring method of DCS, it is characterized in that: it is by means of the real-time computing function of DCS, utilize main steam flow amount, drum pressure to calculate heat signal, and calculate boiler thermal output by flue gas oxygen content, determine the gross energy that fuel discharges then, calculate the average low heat valve of fuel thus, finally calculate the unit consumption index of boiler; Its concrete grammar step is as follows:
(1) calculate heat signal:
A. at first be determined by experiment the heat storage coefficient C of boiler
b
Normally in service at boiler, keep fuel quantity and air quantity constant, at t=t
0Constantly, increase the steam flow that boiler provides to the user fast, the Changing Pattern that the monitored picture on the active station shows below: main steam flow amount progressively increases, increase to peak after, slowly descend again, finally return to t=t
0Flow value constantly, meanwhile, drum pressure descends again and again, and finally is stabilized in a certain numerical value, and this moment, experiment finished, record start, dwell time, and,, calculate heat storage coefficient C in conjunction with relevant engineering manual according to the historical trend recording curve
b
B. according to main steam flow amount D, drum pressure P
b, heat storage coefficient C
b, ask for heat signal by following formula (1):
D
Q (reality)=D+ (C
bS/ (1+T
dS)) P
b-(T
dS/ (1+T
dS)) D (1)
Wherein:
D
Q (reality)---the heat signal that adopts actual differential to ask for, Kg/s
D---main steam flow amount, Kg/s
P
b---drum pressure, MPa
C
b---heat storage coefficient, Kg/MPa
T
d---get constant 1
On the graphical configuration software of DCS, select actual differential module, multiplier module, addition module, subtraction block, can be earlier by asking for P
bActual differential, again with C
bMultiply each other,, deduct the actual differential value of D at last, promptly obtain heat signal D again with main steam flow amount D addition
Q (reality)
(2) thermal efficiency of calculating boiler:
A. look into engineering manual, determine under the boiler declared working condition Enthalpy of Feed Water h
sWith the numerical value of superheated steam enthalpy h ', and manually compute out h=h '-h
s, and calculate total caloric receptivity Qr according to following formula (2);
Qr=D
Q (reality)(h '-h
s) (2)
Wherein:
Total caloric receptivity of Qr---vapour pressure production process, KJ/s
D
Q (reality)---the heat signal that adopts actual differential to ask for, Kg/s
H '---superheated steam enthalpy, KJ/Kg
h
s---Enthalpy of Feed Water, KJ/Kg
On the graphical configuration software of DCS, select multiplier module, ask for h '-h
sWith D
Q (reality)Product, promptly obtain the numerical value of Qr;
B. set up furnace outlet excess air coefficient a
LWith the relation curve of heat loss, and obtain a according to following formula (3)
LAnd further draw boiler three big heat loss sum q by testing and tabling look-up
2+ q
3+ q
4:
a
L＝21/(21-O
2) (3)
Wherein:
a
L---the furnace outlet excess air factor
21---oxygen content in the air, %
O
2---flue gas oxygen content, %
For above-mentioned formula (3), on the graphical configuration software of DCS, select subtraction block, obtain 21 and O
2Difference, again with the division module ask 21 with the result of being divided by of above-mentioned difference, obtain a
L
Boiler is carried out anti-balance efficiency measure,, determine the furnace outlet excess air coefficient respectively and be 1.1,1.15,1.25,1.3,1.35,1.4,1.45,1.5 o'clock boiler three big heat loss q by the coal-air ratio adjustment
2, q
3, q
4, and set up excess air coefficient and q
2+ q
3+ q
4The corresponding relation chart, and on the configuration interface of DCS with broken line table definition above-mentioned corresponding relation, use lookup table mode, calculate the pairing q of special air excess coefficient in real time by the DCS system
2+ q
3+ q
4
C. calculate the thermal efficiency of boiler according to following formula (4):
η＝100-q
2-q
3-q
4-q
5-q
6 (4)
Wherein:
q
2---heat loss due to exhaust gas accounts for the ratio into the stove heat;
q
3---heat loss due to unburned gas accounts for the ratio into the stove heat;
q
4---heat loss due to combustibles in refuse accounts for the ratio into the stove heat;
q
5---the heat radiation heat loss accounts for the ratio into the stove heat;
q
6---lime-ash physics sensible heat heat loss and cooling water heat loss account for the ratio into the stove heat;
Wherein, q
5By the acquisition of tabling look-up, be a known constant, q
6Get 0.5-1, be known constant, in the graphical configuration software of DCS, excess air coefficient a
LAs the input of defined broken line table module of above-mentioned (b) step, broken line table module output q
2+ q
3+ q
4The measuring and calculating value, use subtraction block again, calculate the numerical value of efficiency eta;
(3) boiler unit consumption H
dCalculating:
A. calculate the total amount of heat Q of boiler input by following formula (5)
z:
Q
z＝MQ
ar·net＝Qr/ηψ
1 (5)
Wherein:
Total caloric receptivity of Qr---vapour pressure production process, KJ/s
M---fuel flow rate, Kg/s
Q
Arnet---the low heat valve of fuel As-received, KJ/Kg
η---boiler thermal output, %
ψ
1---working medium caloric receptivity accounts for the boiler share that always recepts the caloric, %
On the graphical configuration software of DCS, at first define ψ
1Be a variable, and artificial assignment, ask for ψ with multiplier module then
1With the product of η, use the division module again, ask for Qr and ψ
1* η phase division result promptly obtains Q
Z, and ask for Q with accumulator module
ZAccumulated value Q '
Z, and as the gross energy of a certain section time boiler input, and with Q '
ZOn flow chart, show;
B. according to the artificial interior average low heat valve Q ' of section sometime that calculates of following formula (6)
Arnet:
Q′
ar·net＝Q′
Z/M′(6)
Wherein,
Q '
Arnet---the average low heat valve of fuel As-received, KJ/Kg
M '---go into stove fuel quantity, Kg in the section sometime; M ' obtains by measurement means;
Q '
Z---the gross energy of the boiler input of same time period, KJ; Q '
ZObtain by observation on the active station;
C. according to the artificial mark coal consumption amount M that calculates of following formula (7)
b:
M
b=(Q '
Arnet/ Q
Standard coal) * M ' (7)
Wherein:
M
b---a certain section interior standard coal consumption of time, Kg
Q '
Arnet---the average low heat valve of fuel As-received, KJ/Kg
Go into stove fuel quantity, Kg in M '---a certain period
Q
Standard coal---the low heat valve of standard coal, KJ/Kg
D. manually calculate boiler unit consumption H according to following formula (8)
d:
H
d＝M
b/D
Z (8)
Wherein:
H
d---boiler unit consumption, Kg/Kg
M
b---a certain section interior mark coal consumption amount of time, Kg
D
Z---the total amount of steaming of the boiler in a certain period, Kg.
2, the coal-burning boiler unit consumption measuring method based on DCS according to claim 1 is characterized in that described ψ
1Definite method be: can suppose ψ earlier
1=0.8, by repeatedly calculating average low heat valve Q '
Arnet, and compare with the coal burning caloricity of actual laboratory chemical examination, finally revise ψ
1, make it reasonable value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100128778A CN100412444C (en) | 2006-06-28 | 2006-06-28 | Coal combustion boiler unit consumption measuring and calculating method based on DCS |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100128778A CN100412444C (en) | 2006-06-28 | 2006-06-28 | Coal combustion boiler unit consumption measuring and calculating method based on DCS |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1888530A true CN1888530A (en) | 2007-01-03 |
| CN100412444C CN100412444C (en) | 2008-08-20 |
Family
ID=37577817
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100128778A Expired - Fee Related CN100412444C (en) | 2006-06-28 | 2006-06-28 | Coal combustion boiler unit consumption measuring and calculating method based on DCS |
Country Status (1)
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|---|---|
| CN (1) | CN100412444C (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101832826A (en) * | 2010-05-10 | 2010-09-15 | 华北电力大学 | Measuring method of combustion rate signal of large-scale boiler |
| CN101561148B (en) * | 2009-05-08 | 2011-07-13 | 上海颖科计算机科技有限公司 | Boiler combustion control system and method |
| CN102522128A (en) * | 2011-11-09 | 2012-06-27 | 中广核工程有限公司 | Method and system for testing configuration logic design of DCS (Distributed Control System) of nuclear power station |
| CN103728055A (en) * | 2013-12-17 | 2014-04-16 | 上海交通大学 | Real-time estimation method for flue gas energy of hearth outlet of thermal power generating unit boiler |
| CN104061589A (en) * | 2014-07-17 | 2014-09-24 | 烟台龙源电力技术股份有限公司 | Low-nitrogen combustion control method and device adaptive to coal quality change |
| CN104764040A (en) * | 2015-04-24 | 2015-07-08 | 吉林省誉衡工业电气有限公司 | Coal-fired boiler burning control method based on on-line self-optimization of excess air coefficients |
| CN105042588A (en) * | 2015-08-27 | 2015-11-11 | 长安大学 | Method for determining air-oil ratio of drying barrel combustor of bituminous mixture mixing equipment |
| CN112781032A (en) * | 2021-02-05 | 2021-05-11 | 神华神东电力有限责任公司 | Control method and control device for secondary air of circulating fluidized bed boiler |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86102118A (en) * | 1986-03-22 | 1987-10-14 | 福建省机械科学研究院 | Coal-burning boiler consumption coal and coal consumption for each ton measuring method and device |
| CN1129301A (en) * | 1994-03-12 | 1996-08-21 | 中国科学院长春物理研究所 | Gas-temp. tracing coal-consumption instrument for boiler |
| JP3757319B2 (en) * | 1995-12-21 | 2006-03-22 | バブコック日立株式会社 | Coal fired boiler fuel control system |
| JP2000249331A (en) * | 1999-02-26 | 2000-09-12 | Babcock Hitachi Kk | Boiler controller |
| CN1587820A (en) * | 2004-09-08 | 2005-03-02 | 大连理工大学 | Intelligent control system for boiler and its multiple type of coal control method |
-
2006
- 2006-06-28 CN CNB2006100128778A patent/CN100412444C/en not_active Expired - Fee Related
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| CN101561148B (en) * | 2009-05-08 | 2011-07-13 | 上海颖科计算机科技有限公司 | Boiler combustion control system and method |
| CN101832826A (en) * | 2010-05-10 | 2010-09-15 | 华北电力大学 | Measuring method of combustion rate signal of large-scale boiler |
| CN101832826B (en) * | 2010-05-10 | 2012-05-30 | 华北电力大学 | Measuring method of combustion rate signal of large-scale boiler |
| CN102522128A (en) * | 2011-11-09 | 2012-06-27 | 中广核工程有限公司 | Method and system for testing configuration logic design of DCS (Distributed Control System) of nuclear power station |
| CN102522128B (en) * | 2011-11-09 | 2014-12-17 | 中广核工程有限公司 | Method and system for testing configuration logic design of DCS (Distributed Control System) of nuclear power station |
| CN103728055A (en) * | 2013-12-17 | 2014-04-16 | 上海交通大学 | Real-time estimation method for flue gas energy of hearth outlet of thermal power generating unit boiler |
| CN103728055B (en) * | 2013-12-17 | 2016-03-02 | 上海交通大学 | A kind of real-time estimation method of thermal power unit boiler furnace outlet flue gas energy |
| CN104061589A (en) * | 2014-07-17 | 2014-09-24 | 烟台龙源电力技术股份有限公司 | Low-nitrogen combustion control method and device adaptive to coal quality change |
| CN104764040A (en) * | 2015-04-24 | 2015-07-08 | 吉林省誉衡工业电气有限公司 | Coal-fired boiler burning control method based on on-line self-optimization of excess air coefficients |
| CN104764040B (en) * | 2015-04-24 | 2016-09-14 | 吉林省誉衡工业电气有限公司 | Coal-fired boiler combustion based on excess air factor online from the control method of optimizing |
| CN105042588A (en) * | 2015-08-27 | 2015-11-11 | 长安大学 | Method for determining air-oil ratio of drying barrel combustor of bituminous mixture mixing equipment |
| CN112781032A (en) * | 2021-02-05 | 2021-05-11 | 神华神东电力有限责任公司 | Control method and control device for secondary air of circulating fluidized bed boiler |
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| CN100412444C (en) | 2008-08-20 |
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Effective date of registration: 20100423 Address after: 074000 No. 39 Dong Jie Dong Road, Hebei, Gaobeidian Patentee after: Hebei Huaxin Boiler Group Co., Ltd. Address before: 050054, box 505, Xinhua Road, 1-8, Shijiazhuang, Hebei, Hebei province (West District) Patentee before: Yin Jianping |
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