CN106440834B - A kind of pair takes wind binary channels sintering circular-cooler waste heat boiler to take distinguished and admirable measuring method - Google Patents
A kind of pair takes wind binary channels sintering circular-cooler waste heat boiler to take distinguished and admirable measuring method Download PDFInfo
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- CN106440834B CN106440834B CN201610890347.7A CN201610890347A CN106440834B CN 106440834 B CN106440834 B CN 106440834B CN 201610890347 A CN201610890347 A CN 201610890347A CN 106440834 B CN106440834 B CN 106440834B
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- 239000002918 waste heat Substances 0.000 title claims abstract description 682
- 238000005245 sintering Methods 0.000 title claims abstract description 386
- 238000000034 method Methods 0.000 title claims abstract description 45
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 233
- 239000003546 flue gas Substances 0.000 claims description 233
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 129
- 238000001816 cooling Methods 0.000 claims description 107
- 238000004364 calculation method Methods 0.000 claims description 41
- 239000000779 smoke Substances 0.000 claims description 34
- 229920006395 saturated elastomer Polymers 0.000 claims description 15
- 238000000691 measurement method Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 7
- 239000003517 fume Substances 0.000 abstract 1
- 238000004064 recycling Methods 0.000 abstract 1
- 238000011084 recovery Methods 0.000 description 10
- 230000009977 dual effect Effects 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000002912 waste gas Substances 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 3
- 238000009499 grossing Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000007781 pre-processing Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- F27D17/004—
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- F27D17/001—
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D21/00—Arrangement of monitoring devices; Arrangement of safety devices
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- F27D2017/006—
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
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- General Engineering & Computer Science (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The present invention discloses a kind of pair and wind binary channels sintering circular-cooler waste heat boiler is taken to take distinguished and admirable measuring method, when mainly for the recycling of sintering circular-cooler waste heat, do not have directly measurement take wind flow under conditions of, indirect gain sintering circular-cooler waste heat boiler takes wind flow and designs, including obtaining valid data, calculate waste heat boiler effective use heat, calculate the volume accounting for taking vapor in air piping, it calculates sintering circular-cooler high temperature section and takes wind enthalpy, sintering circular-cooler low-temperature zone takes wind enthalpy, then sintering circular-cooler waste heat boiler high temperature section is calculated by waste heat boiler high temperature overheater fume side parameter and takes wind flow, sintering circular-cooler waste heat boiler low-temperature zone is finally calculated and takes wind flow.
Description
Technical Field
The invention relates to a method for measuring air intake flow of a waste heat boiler of a double-air-intake double-channel sintering circular cooler. The invention relates to the field of sintering in the steel industry, in particular to a method for measuring air intake flow of a waste heat boiler of a double-air-intake double-channel sintering circular cooler.
Background
In the process of steel production, the energy consumption of the sintering process is only second to that of the iron-making process, and accounts for 10% -12% of the total energy consumption of the steel production, and in the sintering process, the heat discharged into the atmosphere in the form of sensible heat of flue gas of a sintering machine and waste gas of a cooling machine accounts for about 50% of the total energy consumption of the sintering process. Because the temperature of the waste gas of the sintering circular cooler is not high, which is approximately 150-.
In recent years, with the development of low-temperature waste heat recovery technology, the cost and investment of waste heat recovery projects in the steel industry are greatly reduced, meanwhile, the efficiency of a waste heat recovery device is remarkably improved, a large number of small and medium-sized steel enterprises are also going to take waste heat recovery projects, and waste heat boilers of sintering ring coolers are widely applied, and particularly under the situation that the current resources are increasingly tense and the environmental protection requirement is higher and higher, the economic benefit and the social benefit can be more prominent.
For the waste heat recovery system of the sintering ring cooler, the air intake (flue gas volume) of the waste heat recovery section of the ring cooler is the most basic input condition and is one of the main monitoring parameters of the operation of the waste heat recovery system, however, because the required floor area of the waste heat recovery system of the sintering ring cooler is large, the actual site conditions are mostly limited (especially, the improvement items), and the long straight pipe section of the air intake pipeline is difficult to ensure. On the other hand, the pipe diameter of the air taking pipeline of the circular cooler is very large (the pipe diameter of the air taking pipeline of the large circular cooler is even as high as 3-4 m) due to the large amount of flue gas (air volume), and the flow measurement has strict requirements on the lengths of the front straight pipe section and the rear straight pipe section, so that the flow measurement requirement of the air taking pipeline is difficult to meet in an engineering field, and the air taking flow measurement result is inevitably greatly deviated from the true value, so that the effectiveness is lost.
Therefore, aiming at the waste heat recovery system of the double-air-taking double-channel sintering ring cooler widely applied to engineering at present, the method for measuring the air-taking flow of the sintering ring cooler is constructed, the air-taking flow of the waste heat boiler of the double-air-taking double-channel sintering ring cooler is indirectly obtained under the condition that direct measurement is not available on site, reliable data are provided for operation monitoring and operation adjustment of the waste heat boiler, and the method has important practical significance.
Disclosure of Invention
In order to achieve the aim, the invention provides a method for measuring the air intake flow of a waste heat boiler of a double-air-intake single-channel sintering circular cooler, which comprises the following steps: selecting one air intake pipeline of two air intake pipelines of the sintering circular cooler waste heat boiler as a first pipeline, and the other pipeline as a second pipeline; wherein the air intake flow of the first pipeline corresponds to the air intake flow of the first pipeline, the air intake flow of the second pipeline corresponds to the air intake flow of the second pipeline, and the specific measurement method comprises the following steps:
acquiring the flow rate of superheated steam, the enthalpy of the superheated steam and the enthalpy of feed water of the waste heat boiler, and calculating the effective utilization heat of the waste heat boiler by using the acquired data;
iteratively calculating the volume ratio of water vapor in the flue gas in the air intake pipeline and the total flow of the inlet flue gas of the waste heat boiler of the sintering circular cooler according to the flue gas side operation parameters of the waste heat boiler and the steam-water side operation parameters of the waste heat boiler;
iteratively calculating the air intake flow rates of the first pipeline and the second pipeline of the waste heat boiler of the sintering ring cooling machine in a standard state according to the volume ratio of water vapor in the flue gas, the total flow rate of the flue gas at the inlet of the waste heat boiler of the sintering ring cooling machine, the air intake enthalpy value of the first pipeline corresponding to the air intake flow rate of the first pipeline of the waste heat boiler of the sintering ring cooling machine, the air intake enthalpy value of the second pipeline corresponding to the air intake flow rate of the second pipeline of the waste heat boiler of the sintering ring cooling machine and the air intake enthalpy value of the inlet of the waste heat;
and calculating the air intake flow rates of the first and second pipelines of the sintering ring cold machine waste heat boiler in the actual state according to the air intake flow rates of the first and second pipelines of the sintering ring cold machine waste heat boiler in the standard state and the local atmospheric pressure, the air intake pressure of the first and second pipelines of the sintering ring cold machine waste heat boiler and the air intake temperature of the first and second pipelines of the sintering ring cold machine waste heat boiler in the standard state.
Preferably, the air intake flow measurement method for the double air intake single channel sintering circular cooler waste heat boiler is characterized in that the waste heat boiler is a single-pressure waste heat boiler, and the calculation formula for obtaining the effective heat utilization of the waste heat boiler is as follows:
Ql＝Dgr(hgr-hgs) Wherein
Qlthe heat is effectively utilized by the waste heat boiler, kJ/h;
Dgrthe flow rate of the superheated steam of the waste heat boiler is kg/h;
hgris the enthalpy value of superheated steam of the waste heat boiler, kJ/kg;
hgsthe enthalpy value of the feed water of the waste heat boiler is kJ/kg.
Or the waste heat boiler is a double-pressure waste heat boiler, and the calculation formula for acquiring the effective heat utilization of the waste heat boiler is as follows:
Ql＝Dgr1(hgr1-hgs)+Dgr2(hgr2-hgs) Wherein
Qlthe heat is effectively utilized by the waste heat boiler, kJ/h;
Dgr1the flow rate of superheated steam at the high-pressure section of the waste heat boiler is kg/h;
hgr1is the enthalpy value of superheated steam in the high-pressure section of the waste heat boiler, kJ/kg;
Dgr2the flow rate of the superheated steam at the low-pressure section of the waste heat boiler is kg/h;
hgr2is the enthalpy value of superheated steam at the low-pressure section of the waste heat boiler, kJ/kg;
hgsthe enthalpy value of the inlet feed water of the waste heat boiler is kJ/kg.
According to the operation parameters of the flue gas side of the waste heat boiler and the operation parameters of the steam-water side of the waste heat boiler, the volume ratio of the steam in the flue gas in the air intake pipeline and the total flow of the inlet flue gas of the waste heat boiler of the sintering circular cooler are calculated in an iterative manner, and the method specifically comprises the following steps:
1) setting the volume ratio k of water vapor in the flue gas in an initial air intake pipeline;
2) calculating the enthalpy value of the inlet flue gas of the waste heat boiler by using the set volume ratio of the water vapor, wherein the calculation formula is as follows:
wherein,
Hinis the enthalpy value of inlet flue gas of the waste heat boiler, kJ/Nm3；
hgk,inIs the enthalpy value of dry air at the temperature of inlet flue gas of the waste heat boiler, kJ/Nm3；
Is the vapor enthalpy value, kJ/Nm, of the waste heat boiler inlet flue gas temperature3；
3) The waste heat boiler is a single-pressure waste heat boiler, the specific water vapor volume ratio is utilized to calculate the smoke enthalpy value of the superheater outlet of the waste heat boiler, and the calculation formula is as follows:
wherein,
Hgrqis the enthalpy value of the outlet flue gas of the waste heat boiler superheater, kJ/Nm3；
hgk,grqIs the enthalpy value of dry air at the outlet flue gas temperature of a waste heat boiler superheater, kJ/Nm3；
Is the vapor enthalpy value, kJ/Nm, of the waste heat boiler superheater outlet flue gas at the temperature3；
Or the waste heat boiler is a double-pressure waste heat boiler, the enthalpy value of the smoke at the outlet of the superheater at the high-pressure section of the waste heat boiler is calculated by utilizing the given water vapor volume ratio, and the calculation formula is as follows:
wherein,
Hgrqis the enthalpy value of the smoke at the outlet of a superheater at the high-pressure section of the waste heat boiler, kJ/Nm3；
hgk,grqIs the dry air enthalpy value, kJ/Nm, of the waste heat boiler at the outlet flue gas temperature of the superheater at the high-pressure section3；
Is the vapor enthalpy value of the waste heat boiler at the outlet flue gas temperature of the superheater at the high-pressure section, kJ/Nm3；
4) Calculating the total flow of the inlet flue gas of the waste heat boiler of the sintering circular cooler in a standard state:
if the exhaust-heat boiler is a single-pressure exhaust-heat boiler, the calculation formula is as follows:
wherein,
is the total flow rate of the inlet flue gas of the waste heat boiler of the sintering circular cooler in the standard state, Nm3/h；
DgrThe flow rate of the superheated steam of the waste heat boiler is kg/h;
hgris the enthalpy value of superheated steam of the waste heat boiler, kJ/kg;
hbhthe enthalpy value of saturated steam of the waste heat boiler is kJ/kg;
Hinis the enthalpy value of inlet flue gas of the waste heat boiler, kJ/Nm3；
HgrqIs the enthalpy value of the outlet flue gas of the waste heat boiler superheater, kJ/Nm3；
If the exhaust-heat boiler is a double-pressure exhaust-heat boiler, the calculation formula is as follows:
wherein,
is the total flow rate of the inlet flue gas of the waste heat boiler of the sintering circular cooler in the standard state, Nm3/h；
Dgr1The flow rate of superheated steam at the high-pressure section of the waste heat boiler is kg/h;
hgr1is the enthalpy value of superheated steam in the high-pressure section of the waste heat boiler, kJ/kg;
hbh1the enthalpy value of saturated steam in a high-pressure section of the waste heat boiler is kJ/kg;
Hinis the enthalpy value of inlet flue gas of the waste heat boiler, kJ/Nm3；
HgrqIs the enthalpy value of the smoke at the outlet of a superheater at the high-pressure section of the waste heat boiler, kJ/Nm3；
5) Calculating the volume ratio k of water vapor in the flue gas in the air intake pipelinejsThe calculation formula is:
wherein,
kjscalculating the volume ratio of water vapor in the flue gas in the air intake pipeline;
Qlthe heat is effectively utilized by the waste heat boiler, kJ/h;
is the total flow rate of the inlet flue gas of the waste heat boiler of the sintering circular cooler in the standard state, Nm3/h；
The heat retention coefficient of the waste heat boiler is obtained;
hgk,infor inlet flue gas temperature of waste heat boilerDry air enthalpy at degree, kJ/Nm3；
hgk,outIs the enthalpy value of dry air under the temperature of the flue gas at the outlet of the waste heat boiler, kJ/Nm3；
Is the vapor enthalpy value, kJ/Nm, of the waste heat boiler inlet flue gas temperature3；
Is the vapor enthalpy value, kJ/Nm, of the exhaust-heat boiler at the outlet flue gas temperature3；
6) Presetting a threshold value α, calculating the volume ratio k of the obtained water vaporjsAnd comparing the volume ratio k of the set water vapor:
if | k-kjsIf the ratio of the volume of the steam in the flue gas in the air intake pipeline is less than or equal to α, and the total flow of the inlet flue gas of the sintering circular cooler waste heat boiler in the standard state
If | k-kjs|>α, then k isjsAnd k, taking the average value of k as the new set volume ratio of the water vapor in the flue gas in the air intake pipeline, and returning to the step 1);
according to the volume ratio of water vapor in flue gas in an air intake pipeline, the dry air enthalpy value at the air intake temperature of a first pipeline of a waste heat boiler of a sintering ring cooling machine, the dry air enthalpy value at the air intake temperature of a second pipeline of the waste heat boiler of the sintering ring cooling machine, the water vapor enthalpy value at the air intake temperature of the first pipeline of the waste heat boiler of the sintering ring cooling machine and the water vapor enthalpy value at the air intake temperature of a second pipeline of the waste heat boiler of the sintering ring cooling machine, the air intake enthalpy value of the first pipeline of the waste heat boiler of the sintering ring cooling machine and the air intake enthalpy value of the second pipeline of the waste heat boiler of the sintering ring cooling machine are obtained by:
wherein,
H1taking air enthalpy value of a first pipeline of a sintering circular cooler waste heat boiler, kJ/Nm3；
H2Taking air enthalpy value, kJ/Nm, of a second pipeline of the sintering circular cooler waste heat boiler3；
k is the volume ratio of water vapor in the flue gas in the air intake pipeline;
hgk,1is the enthalpy value of dry air at the air intake temperature of the first pipeline of the waste heat boiler of the sintering circular cooler, kJ/Nm3；
hgk,2Is the enthalpy value of dry air at the air intake temperature of a second pipeline of the waste heat boiler of the sintering circular cooler, kJ/Nm3；
The enthalpy value of the water vapor at the air intake temperature of the first pipeline of the waste heat boiler of the sintering circular cooler is kJ/Nm3；
The enthalpy value of the water vapor at the air intake temperature of the second pipeline of the waste heat boiler of the sintering circular cooler is kJ/Nm3；
According to the total flow of the inlet flue gas of the sintering ring cold machine waste heat boiler, the air intake enthalpy value of a first pipeline of the sintering ring cold machine waste heat boiler, the air intake enthalpy value of a second pipeline of the sintering ring cold machine waste heat boiler and the inlet flue gas enthalpy value of the waste heat boiler, the air intake flow of the first pipeline and the air intake flow of the second pipeline of the sintering ring cold machine waste heat boiler in a standard state are calculated in an iterative mode, and the method specifically comprises the following steps:
1) setting a first pipeline air intake flow V of the sintering circular cooler waste heat boiler in a standard state1 0；
2) According to the set air intake flow V of the first pipeline of the waste heat boiler of the sintering circular cooler in the standard state1 0Obtaining the air intake flow of the second pipeline of the sintering circular cooler waste heat boiler in the standard stateThe calculation formula used is:
wherein,
the air intake flow rate, Nm, of the second pipeline of the sintering circular cooler waste heat boiler in the standard state3/h；
Is the total flow rate of the inlet flue gas of the waste heat boiler of the sintering circular cooler in the standard state, Nm3/h；
Vl 0Is the air intake flow rate, Nm, of the first pipeline of the sintering circular cooler waste heat boiler in the standard state3/h；
3) Calculating the air intake flow of the first pipeline of the waste heat boiler of the sintering ring cooling machine in the standard state according to the calculated air intake enthalpy value of the first pipeline of the waste heat boiler of the sintering ring cooling machine, the air intake enthalpy value of the second pipeline of the waste heat boiler of the sintering ring cooling machine, the enthalpy value of the inlet flue gas of the waste heat boiler of the waste heatThe calculation formula used is:
wherein,
calculating the air intake flow of the first pipeline of the sintering circular cooler waste heat boiler in the standard state;
is the total flow rate of the inlet flue gas of the waste heat boiler of the sintering circular cooler in the standard state, Nm3/h；
The air intake flow rate, Nm, of the second pipeline of the sintering circular cooler waste heat boiler in the standard state3/h；
HinIs the enthalpy value of inlet flue gas of the waste heat boiler, kJ/Nm3；
H1Taking air enthalpy value of a first pipeline of a sintering circular cooler waste heat boiler, kJ/Nm3；
H2Taking air enthalpy value, kJ/Nm, of a second pipeline of the sintering circular cooler waste heat boiler3；
4) Presetting a threshold value epsilon, and calculating the obtained air intake flow of the first pipeline of the waste heat boiler of the sintering circular cooler in the standard state and the set air intake flow V of the first pipeline of the waste heat boiler of the sintering circular cooler in the standard state1 0And (3) comparison:
if it isThen obtaining the air intake flow V of the first pipeline of the sintering circular cooler waste heat boiler in the standard state1 0And the air intake flow of the second pipeline of the sintering circular cooler waste heat boiler in the standard state
If it isThen will beAnd V1 0Taking the average value of the air intake flow of the first pipeline of the sintering ring cooling machine waste heat boiler in a new set standard state, and returning to the step 1);
calculating the utilization calculation formula of the first and second pipeline air intake flow rates of the sintering ring cold machine waste heat boiler in the actual state according to the first and second pipeline air intake flow rates of the sintering ring cold machine waste heat boiler in the standard state:
wherein,
V1the air intake flow of a first pipeline of the sintering circular cooler waste heat boiler in an actual state is m3/h；
V1 0Is the air intake flow rate, Nm, of the first pipeline of the sintering circular cooler waste heat boiler in the standard state3/h；
paThe local atmospheric pressure is Pa;
pf,lfor sintering ringsThe air intake pressure of a first pipeline of the cold machine waste heat boiler is Pa;
tf,lthe air intake temperature of a first pipeline of a waste heat boiler of the sintering circular cooler is equal to DEG C;
V2the air intake flow of the second pipeline of the sintering circular cooler waste heat boiler in the actual state is m3/h；
The air intake flow rate, Nm, of the second pipeline of the sintering circular cooler waste heat boiler in the standard state3/h；
pf,2The air intake pressure of a second pipeline of the waste heat boiler of the sintering circular cooler is Pa;
tf,2the air intake temperature of a second pipeline of the waste heat boiler of the sintering circular cooler is DEG C;
in order to achieve the aim, the invention provides a method for measuring the air intake flow of a waste heat boiler of a double-air-intake double-channel sintering circular cooler, which comprises the following steps: acquiring the flow rate of superheated steam at a high-temperature section of the waste heat boiler, the enthalpy of the superheated steam at the high-temperature section of the waste heat boiler, the flow rate of the superheated steam at a low-temperature section of the waste heat boiler, the enthalpy of the superheated steam at the low-temperature section of the waste heat boiler and the enthalpy of feed water at an inlet of the waste heat boiler, and calculating the effective heat utilization of the waste heat boiler by using the acquired;
acquiring local atmospheric pressure, atmospheric relative humidity and water vapor saturation pressure at ambient temperature, calculating the absolute humidity of air by using the acquired data, and then calculating the volume ratio of water vapor in flue gas in an air intake pipeline by using the absolute humidity of the air; or setting the volume ratio of the water vapor in the flue gas in the air intake pipeline;
calculating the air intake value of the high-temperature section of the sintering ring cooling machine, the air intake enthalpy value of the low-temperature section of the waste heat boiler, the dry air enthalpy value of the low-temperature section of the waste heat boiler and the water vapor enthalpy value of the outlet flue temperature of the waste heat boiler according to the volume ratio of the water vapor in the flue gas in the air intake pipeline, the dry air enthalpy value of the high-temperature section of the sintering ring cooling machine at the air intake temperature, the dry air enthalpy value of the low-temperature section of the waste heat boiler at the air intake temperature, the water vapor enthalpy value of the outlet flue gas temperature of the waste heat boiler and the water vapor enthalpy value of the outlet flue gas temperature of the waste heat boiler;
calculating the air intake flow of the high-temperature section of the sintering ring cooling machine waste heat boiler in a standard state according to the flow of the waste heat boiler high-temperature section superheated steam, the enthalpy value of the waste heat boiler high-temperature section saturated steam, the air intake enthalpy value of the sintering ring cooling machine high-temperature section and the smoke enthalpy value of the waste heat boiler high-temperature section superheater outlet;
calculating the air intake flow of the low-temperature section of the sintering ring cooling machine waste heat boiler in the standard state according to the air intake flow of the high-temperature section of the sintering ring cooling machine waste heat boiler in the standard state, the effective heat utilization of the waste heat boiler, the heat retention coefficient of the waste heat boiler, the enthalpy value of the smoke gas at the outlet of the waste heat boiler, the air intake enthalpy value of the high-temperature section of the sintering ring cooling machine and the air intake enthalpy value of the low-temperature section of the sintering ring cooling machine;
and calculating to obtain the air taking flow of the high-temperature section of the waste heat boiler of the sintering ring cooling machine in the actual state and the air taking flow of the low-temperature section of the waste heat boiler of the sintering ring cooling machine in the actual state according to the air taking flow of the high-temperature section of the waste heat boiler of the sintering ring cooling machine in the standard state, the air taking flow of the low-temperature section of the waste heat boiler of the sintering ring cooling machine in the standard state, the local atmospheric pressure, the air taking pressure of the high-temperature section of the sintering ring cooling machine, the air taking temperature of the high-temperature section of the sintering ring cooling machine, the air taking pressure of the low-temperature section.
Preferably, the calculation formula for calculating the effective utilization heat is as follows:
Ql＝Dgr1(hgr1-hgs)+Dgr2(hgr2-hgs) Wherein
Qlthe heat is effectively utilized by the waste heat boiler, kJ/h;
Dgr1the flow rate of superheated steam at the high-temperature section of the waste heat boiler is kg/h;
hgr1is the enthalpy of superheated steam at the high-temperature section of the waste heat boiler, kJ/kg;
Dgr2the flow rate of the superheated steam at the low-temperature section of the waste heat boiler is kg/h;
hgr2is the enthalpy of superheated steam at the low-temperature section of the waste heat boiler, kJ/kg;
hgsthe enthalpy of the feed water at the inlet of the waste heat boiler is kJ/kg.
Preferably, the method for measuring the air intake flow of the waste heat boiler of the double-air-intake double-channel sintering ring cooling machine comprises the following steps of directly discharging waste heat boiler waste gas into the atmosphere, firstly obtaining the local atmospheric pressure, the atmospheric relative humidity and the water vapor saturation pressure at the ambient temperature, then calculating the absolute humidity of air by using the obtained data, and calculating the volume ratio of the water vapor in the flue gas in the air intake pipeline by using the absolute humidity of the air, wherein the calculation formulas are respectively as follows:
wherein,
dkabsolute humidity of air, kg/kg (dry air);
pais local atmospheric pressure, Pa;
phi is atmospheric relative humidity,%;
psis the water vapor saturation pressure at ambient temperatureForce, Pa;
or returning the flue gas of the waste heat boiler to the circular cooler, and then adopting a set value for the volume ratio of the steam in the flue gas in the air intake pipeline.
Preferably, the calculation formula for calculating the air intake enthalpy value of the high temperature section of the sintering ring cooling machine, the air intake enthalpy value of the low temperature section of the sintering ring cooling machine, the outlet flue gas enthalpy value of the superheater of the high temperature section of the waste heat boiler and the outlet flue gas enthalpy value of the waste heat boiler is as follows:
wherein,
H1taking the air enthalpy value, kJ/Nm, of the high-temperature section of the sintering circular cooler3；
H2Taking the air enthalpy value, kJ/Nm, for the low temperature section of the sintering circular cooler3；
HgrqIs the enthalpy value of the smoke at the outlet of a superheater at the high-temperature section of the waste heat boiler, kJ/Nm3；
HoutIs the enthalpy value of the smoke at the outlet of the waste heat boiler, kJ/Nm3；
k is the volume ratio of water vapor in the flue gas in the air intake pipeline;
hgk,1is the enthalpy value of dry air at the air intake temperature of the high-temperature section of the sintering circular cooler, kJ/Nm3；
The enthalpy value of the water vapor at the air intake temperature of the high-temperature section of the sintering circular cooler is kJ/Nm3；
hgk,2Is the enthalpy value of dry air at the air intake temperature of the low-temperature section of the sintering circular cooler, kJ/Nm3；
The enthalpy value of the water vapor at the air intake temperature of the low-temperature section of the sintering circular cooler is kJ/Nm3；
hgk,grqIs the dry air enthalpy value under the outlet flue gas temperature of the superheater at the high temperature section of the waste heat boiler, kJ/Nm3；
Is the vapor enthalpy value of the waste heat boiler at the outlet flue gas temperature of the superheater at the high temperature section, kJ/Nm3；
hgk,outIs the enthalpy value of dry air under the temperature of the flue gas at the outlet of the waste heat boiler, kJ/Nm3；
Is the vapor enthalpy value, kJ/Nm, of the exhaust-heat boiler at the outlet flue gas temperature3。
Preferably, the method for measuring the air intake flow of the exhaust-heat boiler of the double air intake double-channel sintering ring cooling machine comprises the following steps of calculating the air intake flow of the high-temperature section of the exhaust-heat boiler in a standard state according to the superheated steam flow of the high-temperature section of the exhaust-heat boiler, the enthalpy value of the superheated steam of the high-temperature section of the exhaust-heat boiler, the saturated steam enthalpy value of the high-temperature section of the exhaust-heat boiler, the air intake enthalpy value of the high-temperature section of the sintering ring cooling machine and the outlet flue gas enthalpy value of the superheater of the high:
wherein,
V1 0the air intake flow rate, Nm, of the sintering circular cooler waste heat boiler at the high temperature section under the standard state3/h；
Dgr1The flow rate of the superheated steam at the high-pressure section is kg/h;
hgr1is the enthalpy value of superheated steam in the high-pressure section of the waste heat boiler, kJ/kg;
hbh1the enthalpy value of saturated steam in a high-pressure section of the waste heat boiler is kJ/kg;
H1taking the air enthalpy value, kJ/Nm, of the high-temperature section of the sintering circular cooler3；
HgrqIs the enthalpy value of the smoke at the outlet of a superheater at the high-pressure section of the waste heat boiler, kJ/Nm3。
Preferably, the calculation formula for calculating the air intake flow of the sintering ring cooling machine waste heat boiler at the low temperature section under the standard state is as follows:
wherein,
the air intake flow rate, Nm, of the sintering circular cooler waste heat boiler at the low temperature section under the standard state3/h；
QlThe heat is effectively utilized by the waste heat boiler, kJ/h;
the heat retention coefficient of the waste heat boiler is obtained;
V1 0the air intake flow rate, Nm, of the sintering circular cooler waste heat boiler at the high temperature section under the standard state3/h；
HoutIs the enthalpy value of the smoke at the outlet of the waste heat boiler, kJ/Nm3；
H1Taking the air enthalpy value, kJ/Nm, of the high-temperature section of the sintering circular cooler3；
H2Taking the air enthalpy value, kJ/Nm, for the low temperature section of the sintering circular cooler3。
Preferably, the method for measuring the air intake flow of the double-air-intake double-channel sintering circular cooler waste heat boiler comprises the following steps of calculating the air intake flow of the high-temperature section of the sintering circular cooler waste heat boiler in the actual state and the air intake flow of the low-temperature section of the sintering circular cooler waste heat boiler in the actual state, wherein the calculation formula is as follows:
wherein,
V1m is the air intake flow of the high-temperature section of the sintering circular cooler waste heat boiler in the actual state3/h；
V1 0The air intake flow rate, Nm, of the sintering circular cooler waste heat boiler at the high temperature section under the standard state3/h；
paThe local atmospheric pressure is Pa;
pf,lthe air pressure Pa is taken from the high-temperature section of the sintering circular cooler
tf,lThe air intake temperature is the temperature at the high-temperature section of the sintering circular cooler;
V2the air intake flow m at the low temperature section of the sintering circular cooler waste heat boiler in the actual state3/h；
The air intake flow rate, Nm, of the sintering circular cooler waste heat boiler at the low temperature section under the standard state3/h；
pf,2Taking air pressure Pa for the low-temperature section of the sintering circular cooler;
tf,2the air intake temperature is the temperature at the low-temperature section of the sintering circular cooler.
The method for measuring the air intake flow of the waste heat boiler of the double-air-intake double-channel sintering ring cooling machine is used for measuring the air intake flow of the waste heat boiler of the double-air-intake double-channel sintering ring cooling machine, the air intake flow of the waste heat boiler of the double-air-intake double-channel sintering ring cooling machine is indirectly obtained through the operation data of the waste heat boiler, the condition of a straight pipe section required by flow measurement is not met on site, the air intake flow cannot be directly measured or the measurement precision cannot be guaranteed, the method is particularly effective, and reliable data can be provided for operation monitoring and operation adjustment of the waste heat boiler as a result, and the method has important practical.
Drawings
FIG. 1 is a flow chart of a waste heat recovery process of a sintering circular cooler waste heat boiler, wherein the running direction of a trolley A, feeding B, 1, 2, 3, 4, 5 and 6 of the waste heat boiler exhaust pipes.
FIG. 2 is a flow chart of a process for recovering waste heat of a sintering circular cooler by adopting a return air mode for smoke discharge of a waste heat boiler; the method comprises the following steps of A trolley running direction, B feeding, 1 waste heat boiler, 2 high-temperature sections of the ring cooling machine, 3 low-temperature sections of the ring cooling machine, 4 high-temperature section air intake pipelines of the ring cooling machine, 5 low-temperature section air intake pipelines of the ring cooling machine and 6 exhaust pipelines of the waste heat boiler.
FIG. 3 is a flow chart of a process for recovering waste heat of a sintering circular cooler by directly discharging smoke of a waste heat boiler; the method comprises the following steps of A trolley running direction, B feeding, 1 waste heat boiler, 2 high-temperature sections of the ring cooling machine, 3 low-temperature sections of the ring cooling machine, 4 high-temperature section air intake pipelines of the ring cooling machine, 5 low-temperature section air intake pipelines of the ring cooling machine and 6 exhaust pipelines of the waste heat boiler.
Detailed Description
The invention is further described with reference to the accompanying drawings.
Example one
The air intake flow of the first pipeline corresponds to the air intake flow of the high-temperature section, the air intake flow of the second pipeline corresponds to the air intake flow of the low-temperature section, and the adopted measuring method comprises the following specific steps:
1. the operation data of the sintering circular cooler waste heat boiler is collected, and the method comprises the following steps: air intake temperature at high temperature section of circular cooler, air intake pressure at high temperature section of circular cooler, air intake temperature at low temperature section of circular cooler, air intake pressure at low temperature section of circular cooler, atmospheric pressure, flue gas side operation parameters of waste heat boiler (including inlet flue gas temperature of waste heat boiler, outlet flue gas temperature of waste heat boiler and outlet flue gas temperature of waste heat boiler for single-pressure waste heat boiler; including inlet flue gas temperature of waste heat boiler, outlet flue gas temperature of waste heat boiler high pressure section superheater and outlet flue gas temperature of waste heat boiler for double-pressure waste heat boiler), and steam side operation parameters of waste heat boiler (including superheated steam temperature, superheated steam pressure, superheated steam flow, steam drum pressure, water supply temperature, water supply pressure and water supply flow for single-pressure waste heat boiler; including superheated steam temperature at high temperature section of waste heat boiler, superheated steam pressure at high pressure section of waste heat boiler, superheated steam pressure of waste heat boiler, The system comprises a waste heat boiler high-pressure section superheated steam flow, a waste heat boiler low-pressure section superheated steam temperature, a waste heat boiler low-pressure section superheated steam pressure, a waste heat boiler low-pressure section superheated steam flow, a high-pressure section steam pocket pressure, a waste heat boiler inlet water supply temperature, a waste heat boiler inlet water supply pressure and a waste heat boiler inlet water supply flow).
2. And (3) preprocessing the data obtained in the step (1), including dead point processing and data smoothing processing, to obtain effective data for solving the air intake flow of the sintering circular cooler waste heat boiler.
3. And (3) acquiring the air intake flow of the waste heat boiler of the sintering circular cooler according to the effective data acquired in the step (2), and specifically comprising the following steps:
3.1 calculating effective utilization Heat Q of exhaust-heat boilerl：
3.1.1 for a single-pressure waste heat boiler:
Ql＝Dgr(hgr-hgs)
wherein Q islThe heat is effectively utilized by the waste heat boiler, kJ/h; dgrThe flow rate of superheated steam is kg/h; h isgrCalculating or looking up a table for the enthalpy value kJ/kg of the superheated steam of the waste heat boiler according to the superheated steam pressure and the superheated steam temperature of the waste heat boiler; h isgsThe enthalpy value kJ/kg of the feed water of the waste heat boiler is obtained by calculating or looking up a table according to the feed water pressure and the feed water temperature of the waste heat boiler.
3.1.2 for a dual pressure exhaust heat boiler:
Ql＝Dgr1(hgr1-hgs)+Dgr2(hgr2-hgs)
wherein Q islThe heat is effectively utilized by the waste heat boiler, kJ/h; dgr1The flow rate of superheated steam at the high-pressure section of the waste heat boiler is kg/h; h isgr1Calculating or looking up a table for the enthalpy value kJ/kg of the superheated steam at the high-pressure section of the waste heat boiler according to the superheated steam pressure and the superheated steam temperature at the high-pressure section of the waste heat boiler; dgr2The flow rate of the superheated steam at the low-pressure section of the waste heat boiler is kg/h; h isgr2Calculating or looking up a table for the enthalpy value kJ/kg of the superheated steam at the low-pressure section of the waste heat boiler according to the superheated steam pressure and the superheated steam temperature at the low-pressure section of the waste heat boiler; h isgsThe enthalpy value kJ/kg of the feed water at the inlet of the waste heat boiler is obtained by calculating or looking up a table by the feed water pressure at the inlet of the waste heat boiler and the feed water temperature.
3.2 solving the volume ratio k of the water vapor in the flue gas in the air intake pipeline and the total flow of the inlet flue gas of the waste heat boiler of the sintering circular cooler through iterative calculation
3.2.1 setting the volume ratio k of water vapor in the flue gas in an initial air intake pipeline;
3.2.2 calculating the enthalpy value of the inlet flue gas of the waste heat boiler:
wherein HinIs the enthalpy value of inlet flue gas of the waste heat boiler, kJ/Nm3；hgk,inIs the enthalpy value of dry air under the temperature of inlet flue gas of the waste heat boiler, kJ/Nm3The temperature of the inlet flue gas of the waste heat boiler is calculated or obtained by looking up a table;is the vapor enthalpy value, kJ/Nm, of the waste heat boiler inlet flue gas temperature3And the temperature is obtained by calculating or looking up a table through the temperature of the inlet flue gas of the waste heat boiler.
3.2.3, calculating the enthalpy value of the smoke at the outlet of the superheater of the waste heat boiler:
3.2.3.1 for a single-pressure waste heat boiler:
wherein HgrqIs the enthalpy value of the outlet flue gas of the waste heat boiler superheater, kJ/Nm3；hgk,grqIs the enthalpy value of dry air at the outlet flue gas temperature of a waste heat boiler superheater, kJ/Nm3The temperature of the flue gas at the outlet of the waste heat boiler superheater is calculated or obtained by looking up a table;is the vapor enthalpy value, kJ/Nm, of the waste heat boiler superheater outlet flue gas at the temperature3And the temperature is obtained by calculating or looking up a table through the temperature of the flue gas at the outlet of the waste heat boiler superheater.
3.2.3.2 for a dual pressure exhaust heat boiler:
wherein HgrqIs the enthalpy value of the smoke at the outlet of a superheater at the high-pressure section of the waste heat boiler, kJ/Nm3；hgk,grqIs the dry air enthalpy value, kJ/Nm, of the waste heat boiler at the outlet flue gas temperature of the superheater at the high-pressure section3The temperature of the flue gas at the outlet of the superheater at the high-pressure section of the waste heat boiler is calculated or obtained by looking up a table;is the vapor enthalpy value of the waste heat boiler at the outlet flue gas temperature of the superheater at the high-pressure section, kJ/Nm3And the temperature of the flue gas at the outlet of the superheater at the high-pressure section of the waste heat boiler is calculated or obtained by looking up a table.
3.2.4 calculating the total flow of the inlet flue gas of the waste heat boiler of the sintering circular cooler in the standard state:
3.2.4.1 for a single-pressure waste heat boiler:
wherein,is the total flow rate of the inlet flue gas of the waste heat boiler of the sintering circular cooler in the standard state, Nm3/h；DgrThe flow rate of superheated steam is kg/h; h isgrCalculating or looking up a table for the enthalpy value kJ/kg of the superheated steam of the waste heat boiler according to the superheated steam pressure and the superheated steam temperature of the waste heat boiler; h isbhThe enthalpy value kJ/kg of saturated steam of the waste heat boiler is obtained by calculating or looking up a table according to the pressure of a steam drum of the waste heat boiler; hinIs the enthalpy value of inlet flue gas of the waste heat boiler, kJ/Nm3；HgrqIs the enthalpy value of the outlet flue gas of the waste heat boiler superheater, kJ/Nm3。
3.2.4.2 for a dual pressure exhaust heat boiler:
wherein,is the total flow rate of the inlet flue gas of the waste heat boiler of the sintering circular cooler in the standard state, Nm3/h；Dgr1The flow rate of the superheated steam at the high-pressure section is kg/h; h isgr1Calculating or looking up a table for the enthalpy value kJ/kg of the superheated steam at the high-pressure section of the waste heat boiler according to the superheated steam pressure and the superheated steam temperature at the high-pressure section of the waste heat boiler; h isbh1The enthalpy value kJ/kg of saturated steam at the high-pressure section of the waste heat boiler is obtained by calculating or looking up a table according to the pressure of a steam pocket at the high-pressure section of the waste heat boiler; hinIs the enthalpy value of inlet flue gas of the waste heat boiler, kJ/Nm3；HgrqIs the enthalpy value of the smoke at the outlet of a superheater at the high-pressure section of the waste heat boiler, kJ/Nm3。
3.2.5 solving the calculated volume ratio k of water vapor in the flue gas in the air intake pipelinejs；
Wherein k isjsCalculating the volume ratio of water vapor in the flue gas in the air intake pipeline; qlThe heat is effectively utilized by the waste heat boiler, kJ/h;is the total flow rate of the inlet flue gas of the waste heat boiler of the sintering circular cooler in the standard state, Nm3/h；The heat retention coefficient of the waste heat boiler can be set; h isgk,inIs the enthalpy value of dry air under the temperature of inlet flue gas of the waste heat boiler, kJ/Nm3The temperature of the inlet flue gas of the waste heat boiler is calculated or obtained by looking up a table; h isgk,outIs the enthalpy value of dry air under the temperature of the flue gas at the outlet of the waste heat boiler, kJ/Nm3The temperature of the flue gas at the outlet of the waste heat boiler is calculated or obtained by looking up a table;is the vapor enthalpy value, kJ/Nm, of the waste heat boiler inlet flue gas temperature3The temperature of the inlet flue gas of the waste heat boiler is calculated or obtained by looking up a table;is the vapor enthalpy value, kJ/Nm, of the exhaust-heat boiler at the outlet flue gas temperature3And the temperature is obtained by calculating or looking up a table through the temperature of the flue gas at the outlet of the waste heat boiler.
3.2.6 the volume ratio k of the water vapor in the flue gas in the air intake pipeline calculated in the step 3.2.5jsComparison with k set in step 3.2.1:
if the difference value of the two is in the set error range, the volume ratio k of the steam in the flue gas in the output air intake pipeline and the total flow of the inlet flue gas of the waste heat boiler of the sintering ring cooler in the standard state are determined
If the difference between the two is not in the set range, k is setjsAnd taking the average value of the k and the average value of the k as a set value of the volume ratio of the water vapor in the flue gas in the new air intake pipe, and then re-executing the step 3.2.1 to the step 3.2.6.
3.3, respectively calculating the air intake enthalpy value of the high-temperature section of the sintering circular cooler and the air intake enthalpy value of the low-temperature section of the sintering circular cooler:
wherein HhTaking the air enthalpy value, kJ/Nm, of the high-temperature section of the sintering circular cooler3；HlTaking the air enthalpy value, kJ/Nm, for the low temperature section of the sintering circular cooler3(ii) a k is the volume ratio of water vapor in the flue gas in the air intake pipeline; h isgk,hIs the enthalpy value of dry air at the air intake temperature of the high-temperature section of the sintering circular cooler, kJ/Nm3The temperature is obtained by calculating or looking up a table of the air intake temperature of the high-temperature section of the sintering circular cooler; h isgk,lIs the enthalpy value of dry air at the air intake temperature of the low-temperature section of the sintering circular cooler, kJ/Nm3The temperature is obtained by calculating or looking up a table through the air intake temperature of the low-temperature section of the sintering circular cooler;the enthalpy value of the water vapor at the air intake temperature of the high-temperature section of the sintering circular cooler is kJ/Nm3The temperature is obtained by calculating or looking up a table of the air intake temperature of the high-temperature section of the sintering circular cooler;the enthalpy value of the water vapor at the air intake temperature of the low-temperature section of the sintering circular cooler is kJ/Nm3And the temperature is obtained by calculating or looking up a table through the air intake temperature of the low-temperature section of the sintering circular cooler.
3.4, acquiring the air intake flow of the high-temperature section of the waste heat boiler of the sintering ring cooling machine and the air intake flow of the low-temperature section of the waste heat boiler of the sintering ring cooling machine in a standard state through iterative calculation:
3.4.1 setting an initial air intake flow rate of the high-temperature section of the sintering circular cooler waste heat boiler in the standard state
3.4.2 calculating to obtain the air intake flow V of the low temperature section of the sintering circular cooler waste heat boiler in the standard statel 0：
Wherein, Vl 0The air intake flow rate, Nm, of the sintering circular cooler waste heat boiler at the low temperature section under the standard state3/h；Is the total flow rate of the inlet flue gas of the waste heat boiler of the sintering circular cooler in the standard state, Nm3/h；The air intake flow rate, Nm, of the sintering circular cooler waste heat boiler at the high temperature section under the standard state3/h；
3.4.3 calculating the air intake flow of the high-temperature section of the sintering circular cooler waste heat boiler in the standard state
Wherein,calculating the air intake flow rate Nm of the sintering circular cooler waste heat boiler at the high temperature section under the standard state3/h；Is the total flow rate of the inlet flue gas of the waste heat boiler of the sintering circular cooler in the standard state, Nm3/h；Vl 0The air intake flow rate, Nm, of the sintering circular cooler waste heat boiler at the low temperature section under the standard state3/h；HinIs the enthalpy value of inlet flue gas of the waste heat boiler, kJ/Nm3；HhTaking the air enthalpy value, kJ/Nm, of the high-temperature section of the sintering circular cooler3；HlTaking the air enthalpy value, kJ/Nm, for the low temperature section of the sintering circular cooler3。
3.4.4 obtaining the air intake flow of the sintering ring cooler waste heat boiler in the standard state obtained in the step 3.4.3Assumed in step 3.4.1And (3) comparison:
if the difference value of the two is in the set range, the air intake flow of the high-temperature section of the waste heat boiler of the sintering circular cooler in the standard state is outputAnd the air intake flow V of the low-temperature section of the sintering circular cooler waste heat boiler in the standard statel 0；
If the difference between the two is not in the set range, the difference will beAndthe average value of the air intake flow of the high-temperature section is used as a new set value of the air intake flow of the high-temperature section, and then the step 3.4.1 to the step 3.4.4 are executed again.
3.5 calculating the air intake flow rate of the high-temperature section of the waste heat boiler of the sintering ring cooling machine in the actual state and the air intake flow rate of the low-temperature section of the waste heat boiler of the sintering ring cooling machine in the actual state by utilizing the air intake flow rate of the high-temperature section of the waste heat boiler of the sintering ring cooling machine in the standard state and the air intake flow rate of the low-temperature section of the waste heat boiler of the sintering ring cooling machine in the standard state, which are obtained by iterative calculation:
wherein, VhM is the air intake flow of the high-temperature section of the sintering circular cooler waste heat boiler in the actual state3/h；The air intake flow rate, Nm, of the sintering circular cooler waste heat boiler at the high temperature section under the standard state3/h；paThe local atmospheric pressure is Pa; p is a radical off,hTaking air pressure Pa for the high-temperature section of the sintering circular cooler; t is tf,hThe air intake temperature is the temperature at the high-temperature section of the sintering circular cooler; vlThe air intake flow m at the low temperature section of the sintering circular cooler waste heat boiler in the actual state3/h；Vl 0The air intake flow rate, Nm, of the sintering circular cooler waste heat boiler at the low temperature section under the standard state3/h；pf,lTaking air pressure Pa for the low-temperature section of the sintering circular cooler; t is tf,lThe air intake temperature is the temperature at the low-temperature section of the sintering circular cooler.
Example two
The air intake flow of the first pipeline corresponds to the air intake flow of the low-temperature section, the air intake flow of the second pipeline corresponds to the air intake flow of the high-temperature section, and the adopted measuring method comprises the following specific steps:
1. the operation data of the sintering circular cooler waste heat boiler is collected, and the method comprises the following steps: air intake temperature at high temperature section of ring cooling machine, air intake pressure at high temperature section of ring cooling machine, air intake temperature at low temperature section of ring cooling machine, air intake pressure at low temperature section of ring cooling machine, flue gas side operation parameters of waste heat boiler (including inlet flue gas temperature of waste heat boiler, outlet flue gas temperature of waste heat boiler superheater and outlet flue gas temperature of waste heat boiler for single-pressure waste heat boiler; inlet flue gas temperature of waste heat boiler, outlet flue gas temperature of waste heat boiler for high pressure section of waste heat boiler and outlet flue gas temperature of waste heat boiler for double-pressure waste heat boiler), and steam side operation parameters of waste heat boiler (including superheated steam temperature, superheated steam pressure, superheated steam flow, steam drum pressure, feed water temperature, feed water pressure and feed water flow for single-pressure waste heat boiler; superheated steam temperature at high pressure section of waste heat boiler, superheated steam pressure of waste heat boiler, The system comprises a waste heat boiler high-pressure section superheated steam flow, a waste heat boiler low-pressure section superheated steam temperature, a waste heat boiler low-pressure section superheated steam pressure, a waste heat boiler low-pressure section superheated steam flow, a high-pressure section steam pocket pressure, a waste heat boiler inlet water supply temperature, a waste heat boiler inlet water supply pressure and a waste heat boiler inlet water supply flow).
2. And (3) preprocessing the input data obtained in the step (1), including dead pixel processing and data smoothing processing, to obtain effective data for solving the air intake flow of the sintering circular cooler waste heat boiler.
3. And (3) acquiring the air intake flow of the waste heat boiler of the sintering circular cooler according to the effective data acquired in the step (2), and specifically comprising the following steps:
3.1 calculating effective utilization Heat Q of exhaust-heat boilerl：
3.1.1 for a single-pressure waste heat boiler:
Ql＝Dgr(hgr-hgs)
wherein Q islThe heat is effectively utilized by the waste heat boiler, kJ/h; dgrThe flow rate of superheated steam is kg/h; h isgrIs a waste heat boilerThe enthalpy value of the superheated steam of the furnace, kJ/kg, is obtained by calculating or looking up a table according to the superheated steam pressure and the superheated steam temperature of the waste heat boiler; h isgsThe enthalpy value kJ/kg of the feed water of the waste heat boiler is obtained by calculating or looking up a table according to the feed water pressure and the feed water temperature of the waste heat boiler.
3.1.2 for a dual pressure exhaust heat boiler:
Ql＝Dgr1(hgr1-hgs)+Dgr2(hgr2-hgs)
wherein Q islThe heat is effectively utilized by the waste heat boiler, kJ/h; dgr1The flow rate of superheated steam at the high-pressure section of the waste heat boiler is kg/h; h isgr1Calculating or looking up a table for the enthalpy value kJ/kg of the superheated steam at the high-pressure section of the waste heat boiler according to the superheated steam pressure and the superheated steam temperature at the high-pressure section of the waste heat boiler; dgr2The flow rate of the superheated steam at the low-pressure section of the waste heat boiler is kg/h; h isgr2Calculating or looking up a table for the enthalpy value kJ/kg of the superheated steam at the low-pressure section of the waste heat boiler according to the superheated steam pressure and the superheated steam temperature at the low-pressure section of the waste heat boiler; h isgsThe enthalpy value kJ/kg of the feed water at the inlet of the waste heat boiler is obtained by calculating or looking up a table by the feed water pressure at the inlet of the waste heat boiler and the feed water temperature.
3.2 solving the volume ratio k of the water vapor in the flue gas in the air intake pipeline and the total flow of the inlet flue gas of the waste heat boiler of the sintering circular cooler through iterative calculation
3.2.1 setting the volume ratio k of water vapor in the flue gas in an initial air intake pipeline;
3.2.2 calculating the enthalpy value of the inlet flue gas of the waste heat boiler:
wherein HinIs the enthalpy value of inlet flue gas of the waste heat boiler, kJ/Nm3；hgk,inIs the enthalpy value of dry air under the temperature of inlet flue gas of the waste heat boiler, kJ/Nm3The temperature of the inlet flue gas of the waste heat boiler is calculated or obtained by looking up a table;is the vapor enthalpy value, kJ/Nm, of the waste heat boiler inlet flue gas temperature3And the temperature is obtained by calculating or looking up a table through the temperature of the inlet flue gas of the waste heat boiler.
3.2.3, calculating the enthalpy value of the smoke at the outlet of the superheater of the waste heat boiler:
3.2.3.1 for a single-pressure waste heat boiler:
wherein HgrqIs the enthalpy value of the outlet flue gas of the waste heat boiler superheater, kJ/Nm3；hgk,grqIs the enthalpy value of dry air at the outlet flue gas temperature of a waste heat boiler superheater, kJ/Nm3The temperature of the flue gas at the outlet of the waste heat boiler superheater is calculated or obtained by looking up a table;is the vapor enthalpy value, kJ/Nm, of the waste heat boiler superheater outlet flue gas at the temperature3And the temperature is obtained by calculating or looking up a table through the temperature of the flue gas at the outlet of the waste heat boiler superheater.
3.2.3.2 for a dual pressure exhaust heat boiler:
wherein HgrqIs the enthalpy value of the smoke at the outlet of a superheater at the high-pressure section of the waste heat boiler, kJ/Nm3；hgk,grqIs the dry air enthalpy value, kJ/Nm, of the waste heat boiler at the outlet flue gas temperature of the superheater at the high-pressure section3The temperature of the flue gas at the outlet of the superheater at the high-pressure section of the waste heat boiler is calculated or obtained by looking up a table;is the vapor enthalpy value of the waste heat boiler at the outlet flue gas temperature of the superheater at the high-pressure section, kJ/Nm3And the temperature of the flue gas at the outlet of the superheater at the high-pressure section of the waste heat boiler is calculated or obtained by looking up a table.
3.2.4 calculating the total flow of the inlet flue gas of the waste heat boiler of the sintering circular cooler in the standard state:
3.2.4.1 for a single-pressure waste heat boiler:
wherein,is the total flow rate of the inlet flue gas of the waste heat boiler of the sintering circular cooler in the standard state, Nm3/h；DgrThe flow rate of superheated steam is kg/h; h isgrCalculating or looking up a table for the enthalpy value kJ/kg of the superheated steam of the waste heat boiler according to the superheated steam pressure and the superheated steam temperature of the waste heat boiler; h isbhThe enthalpy value kJ/kg of saturated steam of the waste heat boiler is obtained by calculating or looking up a table according to the pressure of a steam drum of the waste heat boiler; hinIs the enthalpy value of inlet flue gas of the waste heat boiler, kJ/Nm3；HgrqIs the enthalpy value of the outlet flue gas of the waste heat boiler superheater, kJ/Nm3。
3.2.4.2 for a dual pressure exhaust heat boiler:
wherein,is the total flow rate of the inlet flue gas of the waste heat boiler of the sintering circular cooler in the standard state, Nm3/h；Dgr1The flow rate of the superheated steam at the high-pressure section is kg/h; h isgr1Calculating or looking up a table for the enthalpy value kJ/kg of the superheated steam at the high-pressure section of the waste heat boiler according to the superheated steam pressure and the superheated steam temperature at the high-pressure section of the waste heat boiler; h isbh1For high pressure of waste heat boilerThe section saturated steam enthalpy value, kJ/kg, is obtained by calculating or looking up a table by the pressure of a steam pocket at the high-pressure section of the waste heat boiler; hinIs the enthalpy value of inlet flue gas of the waste heat boiler, kJ/Nm3；HgrqIs the enthalpy value of the smoke at the outlet of a superheater at the high-pressure section of the waste heat boiler, kJ/Nm3。
3.2.5 solving the calculated volume ratio k of water vapor in the flue gas in the air intake pipelinejs：
Wherein k isjsCalculating the volume ratio of water vapor in the flue gas in the air intake pipeline; qlThe heat is effectively utilized by the waste heat boiler, kJ/h;is the total flow rate of the inlet flue gas of the waste heat boiler of the sintering circular cooler in the standard state, Nm3/h；The heat retention coefficient of the waste heat boiler can be set; h isgk,inIs the enthalpy value of dry air under the temperature of inlet flue gas of the waste heat boiler, kJ/Nm3The temperature of the inlet flue gas of the waste heat boiler is calculated or obtained by looking up a table; h isgk,outIs the enthalpy value of dry air under the temperature of the flue gas at the outlet of the waste heat boiler, kJ/Nm3The temperature of the flue gas at the outlet of the waste heat boiler is calculated or obtained by looking up a table;is the vapor enthalpy value, kJ/Nm, of the waste heat boiler inlet flue gas temperature3The temperature of the inlet flue gas of the waste heat boiler is calculated or obtained by looking up a table;is the vapor enthalpy value, kJ/Nm, of the exhaust-heat boiler at the outlet flue gas temperature3And the temperature is obtained by calculating or looking up a table through the temperature of the flue gas at the outlet of the waste heat boiler.
3.2.6 general procedures3.2.5 calculating the volume ratio k of water vapor in the flue gas in the air intake pipelinejsComparison with k set in step 3.2.1:
if the difference value of the two is in the set error range, the volume ratio k of the steam in the flue gas in the output air intake pipeline and the total flow of the inlet flue gas of the waste heat boiler of the sintering ring cooler in the standard state are determined
If the difference between the two is not in the set range, k is setjsAnd taking the average value of the k and the average value of the k as a set value of the volume ratio of the water vapor in the flue gas in the new air intake pipe, and then re-executing the step 3.2.1 to the step 3.2.6.
3.3, calculating the air intake enthalpy value of the high-temperature section of the sintering ring cooling machine and the air intake enthalpy value of the low-temperature section of the sintering ring cooling machine:
wherein HhTaking the air enthalpy value, kJ/Nm, of the high-temperature section of the sintering circular cooler3；HlTaking the air enthalpy value, kJ/Nm, for the low temperature section of the sintering circular cooler3(ii) a k is the volume ratio of water vapor in the flue gas in the air intake pipeline; h isgk,hIs the enthalpy value of dry air at the air intake temperature of the high-temperature section of the sintering circular cooler, kJ/Nm3The temperature is obtained by calculating or looking up a table of the air intake temperature of the high-temperature section of the sintering circular cooler; h isgk,lIs the enthalpy value of dry air at the air intake temperature of the low-temperature section of the sintering circular cooler, kJ/Nm3The temperature is obtained by calculating or looking up a table through the air intake temperature of the low-temperature section of the sintering circular cooler;the enthalpy value of the water vapor at the air intake temperature of the high-temperature section of the sintering circular cooler is kJ/Nm3The temperature is obtained by calculating or looking up a table of the air intake temperature of the high-temperature section of the sintering circular cooler;the enthalpy value of the water vapor at the air intake temperature of the low-temperature section of the sintering circular cooler is kJ/Nm3And the temperature is obtained by calculating or looking up a table through the air intake temperature of the low-temperature section of the sintering circular cooler.
3.4, acquiring the air intake flow of the high-temperature section and the low-temperature section of the sintering circular cooler waste heat boiler in the standard state through iterative calculation:
3.4.1 setting air intake flow V of low-temperature section of waste heat boiler of sintering circular cooler in initial standard statel 0；
3.4.2 calculating to obtain the air intake flow rate of the high-temperature section of the sintering circular cooler waste heat boiler in the standard state
Wherein, Vl 0The air intake flow rate, Nm, of the sintering circular cooler waste heat boiler at the low temperature section under the standard state3/h；Is the total flow rate of the inlet flue gas of the waste heat boiler of the sintering circular cooler in the standard state, Nm3/h；The air intake flow rate, Nm, of the sintering circular cooler waste heat boiler at the high temperature section under the standard state3/h。
3.4.3 calculating the air intake flow of the sintering circular cooler waste heat boiler at the low temperature section under the standard state
Wherein,the calculated air intake flow rate, Nm, of the sintering circular cooler waste heat boiler at the low temperature section in the standard state3/h；Is the total flow rate of the inlet flue gas of the waste heat boiler of the sintering circular cooler in the standard state, Nm3/h；The air intake flow rate, Nm, of the sintering circular cooler waste heat boiler at the high temperature section under the standard state3/h；HinIs the enthalpy value of inlet flue gas of the waste heat boiler, kJ/Nm3；HhTaking the air enthalpy value, kJ/Nm, of the high-temperature section of the sintering circular cooler3；HlTaking the air enthalpy value, kJ/Nm, for the low temperature section of the sintering circular cooler3。
3.4.4 obtaining the air intake flow of the sintering ring cooler waste heat boiler in the standard state obtained in the step 3.4.3 at the low temperature sectionAssumed V from step 3.4.1l 0And (3) comparison:
if the difference value of the two is in the set range, the air intake flow V of the low-temperature section of the waste heat boiler of the sintering circular cooler in the standard state is outputl 0And the air intake flow of the high-temperature section of the sintering circular cooler waste heat boiler in the standard state
If the difference between the two is not in the set range, the difference will beAnd Vl 0The average value of the air intake flow of the low-temperature section is used as a new set value of the air intake flow of the low-temperature section, and then the step 3.4.1-3.4.4 is executed again.
3.5 calculating the air intake flow rate of the high-temperature section of the waste heat boiler of the sintering ring cooling machine in the actual state and the air intake flow rate of the low-temperature section of the waste heat boiler of the sintering ring cooling machine in the actual state by utilizing the air intake flow rate of the high-temperature section of the waste heat boiler of the sintering ring cooling machine in the standard state and the air intake flow rate of the low-temperature section of the waste heat boiler of the sintering ring cooling machine in the standard state, which are obtained by iterative calculation:
wherein, VhM is the air intake flow of the high-temperature section of the sintering circular cooler waste heat boiler in the actual state3/h；The air intake flow rate, Nm, of the sintering circular cooler waste heat boiler at the high temperature section under the standard state3H; pa is local atmospheric pressure, Pa; p is a radical off,hTaking air pressure Pa for the high-temperature section of the sintering circular cooler; t is tf,hThe air intake temperature is the temperature at the high-temperature section of the sintering circular cooler; vlThe air intake flow m at the low temperature section of the sintering circular cooler waste heat boiler in the actual state3/h；Vl 0The air intake flow rate, Nm, of the sintering circular cooler waste heat boiler at the low temperature section under the standard state3/h；pf,lTaking air pressure Pa for the low-temperature section of the sintering circular cooler; t is tf,lThe air intake temperature is the temperature at the low-temperature section of the sintering circular cooler.
In the third embodiment, the first step is that,
in this embodiment, an air intake flow measurement method for a double-air intake double-channel sintering circular cooler waste heat boiler specifically includes:
1. the operation data of the sintering circular cooler waste heat boiler is collected, and the method comprises the following steps: the method comprises the following steps of taking air temperature at a high-temperature section of the ring cooling machine, taking air pressure at a high-temperature section of the ring cooling machine, taking air temperature at a low-temperature section of the ring cooling machine, taking air pressure at a low-temperature section of the ring cooling machine, flue gas side operation parameters of the waste heat boiler (including flue gas temperature at an outlet of a superheater at a high-pressure section of the waste heat boiler and flue gas temperature at an outlet of the waste heat boiler), steam side operation parameters of the waste heat boiler (including superheated steam temperature at a high-pressure section of the waste heat boiler, superheated steam pressure at a high-pressure section of the waste heat boiler, superheated steam flow at a high-pressure section of the waste heat boiler, superheated steam temperature at a low-pressure section of the.
2. And (3) preprocessing the input data obtained in the step (1), including dead pixel processing and data smoothing processing, to obtain effective data for solving the air intake flow of the sintering circular cooler waste heat boiler.
3. And (3) acquiring the air intake flow of the waste heat boiler of the sintering circular cooler according to the effective data acquired in the step (2), and specifically comprising the following steps:
3.1 calculating effective utilization Heat Q of exhaust-heat boilerl：
Ql＝Dgr1(hgr1-hgs)+Dgr2(hgr2-hgs)
Wherein Q islThe heat is effectively utilized by the waste heat boiler, kJ/h; dgr1The flow rate of superheated steam at the high-pressure section of the waste heat boiler is kg/h; h isgr1The enthalpy, kJ/kg, of the superheated steam at the high-pressure section of the waste heat boiler is obtained by looking up a table of the superheated steam pressure at the high-pressure section of the waste heat boiler and the superheated steam temperature at the high-pressure section; dgr2The flow rate of the superheated steam at the low-pressure section of the waste heat boiler is kg/h; h isgr2Is a waste heat boilerThe enthalpy of the superheated steam at the low-pressure section of the furnace is kJ/kg and is obtained by looking up a table of the superheated steam pressure at the low-pressure section and the superheated steam temperature at the low-pressure section of the waste heat boiler; h isgsThe enthalpy of the inlet feed water of the waste heat boiler is kJ/kg, and the enthalpy is obtained by looking up a table according to the inlet feed water pressure of the waste heat boiler and the inlet feed water temperature of the waste heat boiler;
3.2 obtaining the volume ratio of water vapor in the flue gas in the air intake pipeline:
3.2.1 if the exhausted waste gas of the waste heat boiler returns to the circular cooler through the circulating fan, setting the volume ratio of the water vapor in the flue gas in the air intake pipeline;
3.2.2 if the exhaust gases from the waste heat boiler are discharged directly into the atmosphere, the absolute humidity d of the air is first calculatedkAnd then the obtained absolute humidity d of the air is reusedkCalculating the volume ratio k of water vapor in the flue gas in the air intake pipeline, wherein the calculation formulas are respectively as follows:
wherein d iskAbsolute humidity of air, kg/kg (dry air); p is a radical ofaIs local atmospheric pressure, Pa; phi is atmospheric relative humidity,%; p is a radical ofsIs the water vapor saturation pressure at ambient temperature, Pa, according to the ambient temperature, t0Checking a water vapor meter to obtain; k is the volume ratio of the water vapor in the flue gas in the air intake pipeline.
3.3 respectively calculating the air intake enthalpy value of the high-temperature section of the sintering ring cooling machine, the air intake enthalpy value of the low-temperature section of the sintering ring cooling machine, the smoke enthalpy value of the overheater outlet of the high-pressure section of the waste heat boiler and the smoke enthalpy value of the outlet of the waste heat boiler:
wherein H1Taking the air enthalpy value, kJ/Nm, of the high-temperature section of the sintering circular cooler3；H2Taking the air enthalpy value, kJ/Nm, for the low temperature section of the sintering circular cooler3；HgrqIs the enthalpy value of the smoke at the outlet of a superheater at the high-pressure section of the waste heat boiler, kJ/Nm3；HoutIs the enthalpy value of the smoke at the outlet of the waste heat boiler, kJ/Nm3(ii) a k is the volume ratio (can adopt a set value) of the water vapor in the flue gas in the air intake pipeline; h isgk,hIs the enthalpy value of dry air at the air intake temperature of the high-temperature section of the sintering circular cooler, kJ/Nm3The air intake temperature of the high-temperature section of the sintering circular cooler is obtained by looking up a table;the enthalpy value of the water vapor at the air intake temperature of the high-temperature section of the sintering circular cooler is kJ/Nm3The air intake temperature of the high-temperature section of the sintering circular cooler is obtained by looking up a table; h isgk,2Is the enthalpy value of dry air at the air intake temperature of the low-temperature section of the sintering circular cooler, kJ/Nm3The air intake temperature of the low-temperature section of the sintering circular cooler is obtained by looking up a table;the enthalpy value of the water vapor at the air intake temperature of the low-temperature section of the sintering circular cooler is kJ/Nm3The air intake temperature of the low-temperature section of the sintering circular cooler is obtained by looking up a table; h isgk,grqIs the outlet of a superheater at the high-pressure section of the waste heat boilerDry air enthalpy at mouth flue gas temperature, kJ/Nm3The temperature of the flue gas at the outlet of the superheater at the high-pressure section of the waste heat boiler is obtained by looking up a table;is the vapor enthalpy value of the waste heat boiler at the outlet flue gas temperature of the superheater at the high-pressure section, kJ/Nm3The temperature of the flue gas at the outlet of the superheater at the high-pressure section of the waste heat boiler is obtained by looking up a table; h isgk,outIs the enthalpy value of dry air under the temperature of the flue gas at the outlet of the waste heat boiler, kJ/Nm3The temperature of the flue gas at the outlet of the waste heat boiler is obtained by looking up a table;is the vapor enthalpy value, kJ/Nm, of the exhaust-heat boiler at the outlet flue gas temperature3And the temperature is obtained by looking up a table through the temperature of the flue gas at the outlet of the waste heat boiler.
3.4 calculating the air intake flow of the high-temperature section of the sintering circular cooler waste heat boiler in the standard state:
wherein,the air intake flow rate, Nm, of the sintering circular cooler waste heat boiler at the high temperature section under the standard state3/h；Dgr1The flow rate of the superheated steam at the high-pressure section is kg/h; h isgr1The enthalpy value kJ/kg of the superheated steam at the high-pressure section of the waste heat boiler is obtained by looking up a table of the superheated steam pressure at the high-pressure section and the superheated steam temperature at the high-pressure section of the waste heat boiler; h isbh1The enthalpy value kJ/kg of saturated steam at the high-pressure section of the waste heat boiler is obtained by looking up a table according to the pressure of a steam pocket at the high-pressure section of the waste heat boiler; hhTaking the air enthalpy value, kJ/Nm, of the high-temperature section of the sintering circular cooler3；HgrqIs the enthalpy value of the smoke at the outlet of a superheater at the high-pressure section of the waste heat boiler, kJ/Nm3。
3.5 computing the sintering ring cold machine waste heat pot under the standard stateAir intake flow of low temperature section of furnace
Wherein,the air intake flow rate, Nm, of the sintering circular cooler waste heat boiler at the low temperature section under the standard state3/h；QlThe heat is effectively utilized by the waste heat boiler, kJ/h;the heat retention coefficient of the waste heat boiler can be set; v1 0The air intake flow rate, Nm, of the sintering circular cooler waste heat boiler at the high temperature section under the standard state3/h；HoutIs the enthalpy value of the smoke at the outlet of the waste heat boiler, kJ/Nm3；H1Taking the air enthalpy value, kJ/Nm, of the high-temperature section of the sintering circular cooler3；H2Taking the air enthalpy value, kJ/Nm, for the low temperature section of the sintering circular cooler3。
3.6 calculating to obtain the air intake flow V of the high-temperature section of the sintering circular cooler waste heat boiler in the actual state1And the air intake flow V of the low-temperature section of the sintering circular cooler waste heat boiler in the actual state2：
Wherein, V1M is the air intake flow of the high-temperature section of the sintering circular cooler waste heat boiler in the actual state3/h；V1 0The air intake flow rate, Nm, of the sintering circular cooler waste heat boiler at the high temperature section under the standard state3/h；paThe local atmospheric pressure is Pa; p is a radical off,1Taking air pressure Pa for the high-temperature section of the sintering circular cooler; t is tf,1The air intake temperature is the temperature at the high-temperature section of the sintering circular cooler; v2The air intake flow m at the low temperature section of the sintering circular cooler waste heat boiler in the actual state3/h；The air intake flow rate, Nm, of the sintering circular cooler waste heat boiler at the low temperature section under the standard state3/h；pf,2Taking air pressure Pa for the low-temperature section of the sintering circular cooler; t is tf,2The air intake temperature is the temperature at the low-temperature section of the sintering circular cooler.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.
Claims (9)
1. A method for measuring air intake flow of a waste heat boiler of a double-air-intake single-channel sintering circular cooler is characterized by comprising the following steps of: selecting one air intake pipeline of two air intake pipelines of the waste heat boiler of the sintering circular cooler as a first pipeline, and selecting the other air intake pipeline as a second pipeline;
the air intake flow of the first pipeline corresponds to the air intake flow of the first pipeline of the waste heat boiler of the sintering circular cooler, the air intake flow of the second pipeline corresponds to the air intake flow of the second pipeline of the waste heat boiler of the sintering circular cooler, and the specific measurement method comprises the following steps:
acquiring the superheated steam flow, the superheated steam enthalpy and the feed water enthalpy of the waste heat boiler, and calculating the effective utilization heat of the waste heat boiler by using the acquired data;
according to the operation parameters of the flue gas side of the waste heat boiler and the operation parameters of the steam-water side of the waste heat boiler, the volume ratio of the steam in the flue gas in the air intake pipeline and the total flow of the inlet flue gas of the waste heat boiler of the sintering circular cooler are obtained through iterative calculation;
calculating to obtain a first pipeline air intake enthalpy value of the waste heat boiler of the sintering ring cooling machine and a second pipeline air intake enthalpy value of the waste heat boiler of the sintering ring cooling machine according to the volume ratio of water vapor in flue gas in an air intake pipeline, the dry air enthalpy value at the air intake temperature of a first pipeline of the waste heat boiler of the sintering ring cooling machine, the water vapor enthalpy value at the air intake temperature of the first pipeline of the waste heat boiler of the sintering ring cooling machine and the water vapor enthalpy value at the air intake temperature of a second pipeline of the waste heat boiler of the sintering ring cooling machine;
iteratively calculating the air intake flow rates of the first pipeline and the second pipeline of the waste heat boiler of the sintering ring cooling machine in a standard state according to the total flow rate of the inlet flue gas of the waste heat boiler of the sintering ring cooling machine, the air intake enthalpy value of the first pipeline of the waste heat boiler of the sintering ring cooling machine, the air intake enthalpy value of the second pipeline of the waste heat boiler of the sintering ring cooling machine and the inlet flue gas enthalpy value of the waste heat boiler;
calculating the air intake flow rates of the first and second pipelines of the sintering ring cold machine waste heat boiler in the actual state according to the air intake flow rates of the first and second pipelines of the sintering ring cold machine waste heat boiler in the standard state, the local atmospheric pressure, the air intake pressures of the first and second pipelines of the sintering ring cold machine waste heat boiler and the air intake temperatures of the first and second pipelines of the sintering ring cold machine waste heat boiler in the standard state;
the exhaust-heat boiler is single-pressure exhaust-heat boiler, and the calculation formula of obtaining effective heat utilization of the exhaust-heat boiler is as follows:
Ql＝Dgr(hgr-hgs) Wherein
Qlthe heat is effectively utilized by the waste heat boiler, kJ/h;
Dgrthe flow rate of superheated steam is kg/h;
hgris the enthalpy value of superheated steam of the waste heat boiler, kJ/kg;
hgsthe enthalpy value of the feed water of the waste heat boiler is kJ/kg;
or the waste heat boiler is a double-pressure waste heat boiler, and the calculation formula for acquiring the effective heat utilization of the waste heat boiler is as follows:
Ql＝Dgr1(hgr1-hgs)+Dgr2(hgr2-hgs) Wherein
Qlthe heat is effectively utilized by the waste heat boiler, kJ/h;
Dgr1the flow rate of superheated steam at the high-pressure section of the waste heat boiler is kg/h;
hgr1is the enthalpy value of superheated steam in the high-pressure section of the waste heat boiler, kJ/kg;
Dgr2the flow rate of the superheated steam at the low-pressure section of the waste heat boiler is kg/h;
hgr2is the enthalpy value of superheated steam at the low-pressure section of the waste heat boiler, kJ/kg;
hgsthe enthalpy value of the inlet feed water of the waste heat boiler is kJ/kg;
according to the operation parameters of the flue gas side of the waste heat boiler and the operation parameters of the steam-water side of the waste heat boiler, the volume ratio of the steam in the flue gas in the air intake pipeline and the total flow of the inlet flue gas of the waste heat boiler of the sintering circular cooler are calculated in an iterative manner, and the method specifically comprises the following steps:
1) setting the volume ratio k of water vapor in the flue gas in an initial air intake pipeline;
2) calculating the enthalpy value of the inlet flue gas of the waste heat boiler by using the set volume ratio of the water vapor, wherein the calculation formula is as follows:
wherein,
Hinis the enthalpy value of inlet flue gas of the waste heat boiler, kJ/Nm3；
hgk,inIs the enthalpy value of dry air under the temperature of inlet flue gas of the waste heat boiler, kJ/Nm3；
Is the vapor enthalpy value, k, of the waste heat boiler inlet flue gas at the temperatureJ/Nm3；
3) The waste heat boiler is a single-pressure waste heat boiler, the specific water vapor volume ratio is utilized to calculate the smoke enthalpy value of the superheater outlet of the waste heat boiler, and the calculation formula is as follows:
wherein,
Hgrqis the enthalpy value of the outlet flue gas of the waste heat boiler superheater, kJ/Nm3；
hgk,grqIs the enthalpy value of dry air at the outlet flue gas temperature of a waste heat boiler superheater, kJ/Nm3；
Is the vapor enthalpy value, kJ/Nm, of the waste heat boiler superheater outlet flue gas at the temperature3；
Or the waste heat boiler is a double-pressure waste heat boiler, the specific water vapor volume ratio is utilized to calculate the smoke enthalpy value of the superheater outlet of the high-pressure section of the waste heat boiler, and the calculation formula is as follows:
wherein,
Hgrqis the enthalpy value of the smoke at the outlet of a superheater at the high-pressure section of the waste heat boiler, kJ/Nm3；
hgk,grqIs the dry air enthalpy value, kJ/Nm, of the waste heat boiler at the outlet flue gas temperature of the superheater at the high-pressure section3；
Is the vapor enthalpy value of the waste heat boiler at the outlet flue gas temperature of the superheater at the high-pressure section, kJ/Nm3；
4) Calculating the total flow of the inlet flue gas of the waste heat boiler of the sintering circular cooler in a standard state:
the waste heat boiler is a single-pressure waste heat boiler, and the calculation formula is as follows:
wherein,
is the total flow rate of the inlet flue gas of the waste heat boiler of the sintering circular cooler in the standard state, Nm3/h；
DgrThe flow rate of the superheated steam of the waste heat boiler is kg/h;
hgris the enthalpy value of superheated steam of the waste heat boiler, kJ/kg;
hbhthe enthalpy value of saturated steam of the waste heat boiler is kJ/kg;
Hinis the enthalpy value of inlet flue gas of the waste heat boiler, kJ/Nm3；
HgrqIs the enthalpy value of the outlet flue gas of the waste heat boiler superheater, kJ/Nm3；
Or the waste heat boiler is a double-pressure waste heat boiler, and the calculation formula is as follows:
wherein,
is the total flow rate of the inlet flue gas of the waste heat boiler of the sintering circular cooler in the standard state, Nm3/h；
Dgr1The flow rate of superheated steam at the high-pressure section of the waste heat boiler is kg/h;
hgr1is the enthalpy value of superheated steam in the high-pressure section of the waste heat boiler, kJ/kg;
hbh1the enthalpy value of saturated steam in a high-pressure section of the waste heat boiler is kJ/kg;
Hinis the enthalpy value of inlet flue gas of the waste heat boiler, kJ/Nm3；
HgrqIs the enthalpy value of the smoke at the outlet of a superheater at the high-pressure section of the waste heat boiler, kJ/Nm3；
5) Calculating the volume ratio k of water vapor in the flue gas in the air intake pipelinejsThe calculation formula is:
wherein,
kjscalculating the volume ratio of water vapor in the flue gas in the air intake pipeline;
Qlthe heat is effectively utilized by the waste heat boiler, kJ/h;
is the total flow rate of the inlet flue gas of the waste heat boiler of the sintering circular cooler in the standard state, Nm3/h；
The heat retention coefficient of the waste heat boiler is obtained;
hgk,inis the enthalpy value of dry air under the temperature of inlet flue gas of the waste heat boiler, kJ/Nm3；
hgk,outIs the enthalpy value of dry air under the temperature of the flue gas at the outlet of the waste heat boiler, kJ/Nm3；
Is the vapor enthalpy value, kJ/Nm, of the waste heat boiler inlet flue gas temperature3；
Is the vapor enthalpy value, kJ/Nm, of the exhaust-heat boiler at the outlet flue gas temperature3；
6) Presetting a threshold value α, calculating the volume ratio k of the obtained water vaporjsAnd comparing the volume ratio k of the set water vapor:
if | k-kjsIf the absolute value is less than or equal to α, the volume of the water vapor in the flue gas in the air intake pipeline is obtainedRatio k and total flow of inlet flue gas of waste heat boiler of sintering circular cooler in standard state
If | k-kjs|>α, then k isjsAnd k, taking the average value of k as the new set volume ratio of the water vapor in the flue gas in the air intake pipeline, and returning to the step 1);
according to the volume ratio of water vapor in flue gas in an air intake pipeline, the dry air enthalpy value at the air intake temperature of a first pipeline of a waste heat boiler of a sintering ring cooling machine, the dry air enthalpy value at the air intake temperature of a second pipeline of the waste heat boiler of the sintering ring cooling machine, the water vapor enthalpy value at the air intake temperature of the first pipeline of the waste heat boiler of the sintering ring cooling machine and the water vapor enthalpy value at the air intake temperature of a second pipeline of the waste heat boiler of the sintering ring cooling machine, the air intake enthalpy value of the first pipeline of the waste heat boiler of the sintering ring cooling machine and the air intake enthalpy value of the second pipeline of the waste heat boiler of the sintering ring cooling machine are obtained by:
wherein,
H1taking air enthalpy value of a first pipeline of a sintering circular cooler waste heat boiler, kJ/Nm3；
H2Taking air enthalpy value, kJ/Nm, of a second pipeline of the sintering circular cooler waste heat boiler3；
k is the volume ratio of water vapor in the flue gas in the air intake pipeline;
hgk,1is the enthalpy value of dry air at the air intake temperature of the first pipeline of the waste heat boiler of the sintering circular cooler, kJ/Nm3；
hgk,2Is the enthalpy value of dry air at the air intake temperature of a second pipeline of the waste heat boiler of the sintering circular cooler, kJ/Nm3；
The enthalpy value of the water vapor at the air intake temperature of the first pipeline of the waste heat boiler of the sintering circular cooler is kJ/Nm3；
The enthalpy value of the water vapor at the air intake temperature of the second pipeline of the waste heat boiler of the sintering circular cooler is kJ/Nm3；
According to the total flow of the inlet flue gas of the sintering ring cold machine waste heat boiler, the air intake enthalpy value of a first pipeline of the sintering ring cold machine waste heat boiler, the air intake enthalpy value of a second pipeline of the sintering ring cold machine waste heat boiler and the inlet flue gas enthalpy value of the waste heat boiler, the air intake flow of the first pipeline and the air intake flow of the second pipeline of the sintering ring cold machine waste heat boiler in a standard state are calculated in an iterative mode, and the method specifically comprises the following steps:
1) setting a first pipeline air intake flow V of the sintering circular cooler waste heat boiler in a standard state1 0；
2) According to the set air intake flow V of the first pipeline of the waste heat boiler of the sintering circular cooler in the standard state1 0Obtaining the air intake flow of the second pipeline of the sintering circular cooler waste heat boiler in the standard stateThe calculation formula used is:
wherein,
the air intake flow rate, Nm, of the second pipeline of the sintering circular cooler waste heat boiler in the standard state3/h；
Is the inlet of the waste heat boiler of the sintering circular cooler in the standard stateTotal flow of flue gas, Nm3/h；
Vl 0Is the air intake flow rate, Nm, of the first pipeline of the sintering circular cooler waste heat boiler in the standard state3/h；
3) Calculating the air intake flow of the first pipeline of the waste heat boiler of the sintering ring cooling machine in the standard state according to the calculated air intake enthalpy value of the first pipeline of the waste heat boiler of the sintering ring cooling machine, the air intake enthalpy value of the second pipeline of the waste heat boiler of the sintering ring cooling machine, the enthalpy value of the inlet flue gas of the waste heat boiler of the waste heatThe calculation formula used is:
wherein,
the calculated air intake flow rate, Nm, of the first pipeline of the sintering circular cooler waste heat boiler in the standard state3/h；
Is the total flow rate of the inlet flue gas of the waste heat boiler of the sintering circular cooler in the standard state, Nm3/h；
The air intake flow rate, Nm, of the second pipeline of the sintering circular cooler waste heat boiler in the standard state3/h；
HinIs the enthalpy value of inlet flue gas of the waste heat boiler, kJ/Nm3；
H1Taking air enthalpy value of a first pipeline of a sintering circular cooler waste heat boiler, kJ/Nm3；
H2Taking air enthalpy value, kJ/Nm, of a second pipeline of the sintering circular cooler waste heat boiler3；
4) Presetting a threshold value epsilon, and calculating the obtained air intake flow of the first pipeline of the sintering circular cooler waste heat boiler in the standard stateAnd the air intake flow V of the first pipeline of the sintering circular cooler waste heat boiler in the set standard state1 0And (3) comparison:
if it isThen the air intake flow V of the first pipeline of the sintering circular cooler waste heat boiler in the standard state is output1 0And the air intake flow of the second pipeline of the sintering circular cooler waste heat boiler in the standard state
If it isThen will beAnd V1 0Taking the average value of the air intake flow of the first pipeline of the sintering ring cooling machine waste heat boiler in a new set standard state, and returning to the step 1);
calculating the utilization calculation formula of the first and second pipeline air intake flow rates of the sintering ring cold machine waste heat boiler in the actual state according to the first and second pipeline air intake flow rates of the sintering ring cold machine waste heat boiler in the standard state:
wherein,
V1the air intake flow of a first pipeline of the sintering circular cooler waste heat boiler in an actual state is m3/h；
V1 0Is the air intake flow rate, Nm, of the first pipeline of the sintering circular cooler waste heat boiler in the standard state3/h；
paThe local atmospheric pressure is Pa;
pf,lthe air intake pressure of a first pipeline of a waste heat boiler of the sintering circular cooler is Pa;
tf,1the air intake temperature of a first pipeline of a waste heat boiler of the sintering circular cooler is equal to DEG C;
V2the air intake flow of the second pipeline of the sintering circular cooler waste heat boiler in the actual state is m3/h；
The air intake flow rate, Nm, of the second pipeline of the sintering circular cooler waste heat boiler in the standard state3/h；
pf,2The air intake pressure of a second pipeline of the waste heat boiler of the sintering circular cooler is Pa;
tf,2the air intake temperature of the second pipeline of the waste heat boiler of the sintering circular cooler is in the range of DEG C.
2. A method for measuring air intake flow of a double-air intake double-channel sintering circular cooler waste heat boiler is characterized by comprising the following steps:
acquiring the flow rate of superheated steam at a high-temperature section of the waste heat boiler, the enthalpy of the superheated steam at the high-temperature section of the waste heat boiler, the flow rate of the superheated steam at a low-temperature section of the waste heat boiler, the enthalpy of the superheated steam at the low-temperature section of the waste heat boiler and the enthalpy of feed water at an inlet of the waste heat boiler, and calculating the effective heat utilization of the waste heat boiler by using the acquired;
acquiring local atmospheric pressure, atmospheric relative humidity and water vapor saturation pressure at ambient temperature, calculating the absolute humidity of air by using the acquired data, and calculating the volume ratio of water vapor in flue gas in an air intake pipeline by using the absolute humidity of the air; or setting the volume ratio of the water vapor in the flue gas in the air intake pipeline;
calculating the air intake value of the high-temperature section of the sintering ring cooling machine, the air intake enthalpy value of the low-temperature section of the waste heat boiler, the dry air enthalpy value of the low-temperature section of the waste heat boiler and the water vapor enthalpy value of the outlet flue temperature of the waste heat boiler according to the volume ratio of the water vapor in the flue gas in the air intake pipeline, the dry air enthalpy value of the high-temperature section of the sintering ring cooling machine at the air intake temperature, the dry air enthalpy value of the low-temperature section of the waste heat boiler at the air intake temperature, the water vapor enthalpy value of the outlet flue gas temperature of the waste heat boiler and the water vapor enthalpy value of the outlet flue gas temperature of the waste heat boiler;
calculating the air intake flow of the high-temperature section of the sintering ring cooling machine waste heat boiler in a standard state according to the flow of the waste heat boiler high-temperature section superheated steam, the enthalpy value of the waste heat boiler high-temperature section saturated steam, the air intake enthalpy value of the sintering ring cooling machine high-temperature section and the smoke enthalpy value of the waste heat boiler high-temperature section superheater outlet;
calculating the air intake flow of the low-temperature section of the sintering ring cooling machine waste heat boiler in the standard state according to the air intake flow of the high-temperature section of the sintering ring cooling machine waste heat boiler in the standard state, the effective heat utilization of the waste heat boiler, the heat retention coefficient of the waste heat boiler, the enthalpy value of the smoke gas at the outlet of the waste heat boiler, the air intake enthalpy value of the high-temperature section of the sintering ring cooling machine and the air intake enthalpy value of the low-temperature section of the sintering ring cooling machine;
and calculating to obtain the air taking flow of the high-temperature section of the waste heat boiler of the sintering ring cooling machine in the actual state and the air taking flow of the low-temperature section of the waste heat boiler of the sintering ring cooling machine in the actual state according to the air taking flow of the high-temperature section of the waste heat boiler of the sintering ring cooling machine in the standard state, the air taking flow of the low-temperature section of the waste heat boiler of the sintering ring cooling machine in the standard state, the local atmospheric pressure, the air taking pressure of the high-temperature section of the sintering ring cooling machine, the air taking temperature of the high-temperature section of the sintering ring cooling machine, the air taking pressure of the low-temperature section.
3. The method for measuring the air intake flow of the waste heat boiler of the double-air-intake double-channel sintering circular cooler according to claim 2, wherein the calculation formula for calculating the effective heat utilization is as follows:
Ql＝Dgr1(hgr1-hgs)+Dgr2(hgr2-hgs) Wherein
Qlthe heat is effectively utilized by the waste heat boiler, kJ/h;
Dgr1the flow rate of superheated steam at the high-temperature section of the waste heat boiler is kg/h;
hgr1is the enthalpy of superheated steam at the high-temperature section of the waste heat boiler, kJ/kg;
Dgr2the flow rate of the superheated steam at the low-temperature section of the waste heat boiler is kg/h;
hgr2is the enthalpy of superheated steam at the low-temperature section of the waste heat boiler, kJ/kg;
hgsthe enthalpy of the feed water at the inlet of the waste heat boiler is kJ/kg.
4. The method for measuring the air intake flow of the waste heat boiler with the double air intake double channels of the sintering ring cooler according to claim 2, wherein the method for measuring the air intake flow of the waste heat boiler with the double air intake double channels is characterized in that the method for measuring the air intake flow of the waste heat boiler with the double air intake double channels of the sintering ring cooler is:
wherein,
dkair absolute humidity, kg/kg (dry air);
pais local atmospheric pressure, Pa;
phi is atmospheric relative humidity,%;
psis the water vapor saturation pressure at ambient temperature, Pa.
5. The method for measuring the air intake flow of the waste heat boiler with the double air intake double channels of the sintering ring cooler according to claim 2, wherein the volume ratio of water vapor in the air intake pipeline is calculated by using the absolute humidity of air, and the calculation formula is as follows:
wherein,
dkair absolute humidity, kg/kg (dry air).
6. The method for measuring the air intake flow of the waste heat boiler of the double-air-intake double-channel sintering ring cooling machine according to claim 2, wherein the calculation formulas for calculating the air intake enthalpy value of the high temperature section of the sintering ring cooling machine, the air intake enthalpy value of the low temperature section of the sintering ring cooling machine, the outlet flue gas enthalpy value of the superheater of the high temperature section of the waste heat boiler and the outlet flue gas enthalpy value of the waste heat boiler are as follows:
wherein,
H1taking the air enthalpy value, kJ/Nm, of the high-temperature section of the sintering circular cooler3；
H2Taking the air enthalpy value, kJ/Nm, for the low temperature section of the sintering circular cooler3；
HgrqIs the enthalpy value of the smoke at the outlet of a superheater at the high-temperature section of the waste heat boiler, kJ/Nm3；
HoutIs the enthalpy value of the smoke at the outlet of the waste heat boiler, kJ/Nm3；
k is the volume ratio of water vapor in the flue gas in the air intake pipeline;
hgk,1is the enthalpy value of dry air at the air intake temperature of the high-temperature section of the sintering circular cooler, kJ/Nm3；
The enthalpy value of the water vapor at the air intake temperature of the high-temperature section of the sintering circular cooler is kJ/Nm3；
hgk,2Is the enthalpy value of dry air at the air intake temperature of the low-temperature section of the sintering circular cooler, kJ/Nm3；
The enthalpy value of the water vapor at the air intake temperature of the low-temperature section of the sintering circular cooler is kJ/Nm3；
hgk,grqIs the dry air enthalpy value under the outlet flue gas temperature of the superheater at the high temperature section of the waste heat boiler, kJ/Nm3；
Is the vapor enthalpy value of the waste heat boiler at the outlet flue gas temperature of the superheater at the high temperature section, kJ/Nm3；
hgk,outIs the enthalpy value of dry air under the temperature of the flue gas at the outlet of the waste heat boiler, kJ/Nm3；
Is the vapor enthalpy value, kJ/Nm, of the exhaust-heat boiler at the outlet flue gas temperature3。
7. The method for measuring the air intake flow of the waste heat boiler of the double air intake double-channel sintering ring cooling machine according to claim 2, wherein the air intake flow of the high temperature section of the sintering ring cooling machine in a standard state is calculated according to the superheated steam flow of the high temperature section of the waste heat boiler, the enthalpy value of the superheated steam of the high temperature section of the waste heat boiler, the saturated steam enthalpy value of the high temperature section of the waste heat boiler, the air intake enthalpy value of the high temperature section of the sintering ring cooling machine and the flue gas enthalpy value of the superheater outlet of the high temperature section of the waste heat boiler, and the calculation formula is as follows:
wherein,
V1 0the air intake flow rate, Nm, of the sintering circular cooler waste heat boiler at the high temperature section under the standard state3/h；
Dgr1The flow rate of the superheated steam at the high-pressure section is kg/h;
hgr1is the enthalpy value of superheated steam in the high-pressure section of the waste heat boiler, kJ/kg;
hbh1the enthalpy value of saturated steam in a high-pressure section of the waste heat boiler is kJ/kg;
H1taking the air enthalpy value, kJ/Nm, of the high-temperature section of the sintering circular cooler3；
HgrqIs the enthalpy value of the smoke at the outlet of a superheater at the high-pressure section of the waste heat boiler, kJ/Nm3。
8. The method for measuring the air intake flow of the double-air-intake double-channel sintering ring cooler waste heat boiler according to claim 2, wherein the calculation formula for calculating the air intake flow of the sintering ring cooler waste heat boiler at the low temperature stage in the standard state is as follows:
wherein,
the air intake flow rate, Nm, of the sintering circular cooler waste heat boiler at the low temperature section under the standard state3/h；
QlThe heat is effectively utilized by the waste heat boiler, kJ/h;
the heat retention coefficient of the waste heat boiler is obtained;
V1 0the air intake flow rate, Nm, of the sintering circular cooler waste heat boiler at the high temperature section under the standard state3/h；
HoutIs the enthalpy value of the smoke at the outlet of the waste heat boiler, kJ/Nm3；
H1Taking the air enthalpy value, kJ/Nm, of the high-temperature section of the sintering circular cooler3；
H2Taking the air enthalpy value, kJ/Nm, for the low temperature section of the sintering circular cooler3。
9. The method for measuring the air intake flow of the double-air-intake double-channel waste heat boiler of the sintering ring cooler according to claim 2, wherein the calculation formula for calculating the air intake flow of the high-temperature section of the waste heat boiler of the sintering ring cooler in the actual state and the air intake flow of the low-temperature section of the waste heat boiler of the sintering ring cooler in the actual state is as follows:
wherein,
V1m is the air intake flow of the high-temperature section of the sintering circular cooler waste heat boiler in the actual state3/h；
V1 0The air intake flow rate, Nm, of the sintering circular cooler waste heat boiler at the high temperature section under the standard state3/h；
paThe local atmospheric pressure is Pa;
pf,ltaking air pressure Pa for the high-temperature section of the sintering circular cooler;
tf,lthe air intake temperature is the temperature at the high-temperature section of the sintering circular cooler;
V2the air intake flow m at the low temperature section of the sintering circular cooler waste heat boiler in the actual state3/h；
The air intake flow rate, Nm, of the sintering circular cooler waste heat boiler at the low temperature section under the standard state3/h；
pf,2Taking air pressure Pa for the low-temperature section of the sintering circular cooler;
tf,2the air intake temperature is the temperature at the low-temperature section of the sintering circular cooler.
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