CN112414155A - Method for calculating smoke gas amount of combined type steel rolling heating furnace - Google Patents

Method for calculating smoke gas amount of combined type steel rolling heating furnace Download PDF

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CN112414155A
CN112414155A CN202011295755.0A CN202011295755A CN112414155A CN 112414155 A CN112414155 A CN 112414155A CN 202011295755 A CN202011295755 A CN 202011295755A CN 112414155 A CN112414155 A CN 112414155A
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smoke
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李占军
李里
樊河雲
彭碧君
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Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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Abstract

The invention discloses a method for calculating the smoke gas volume of a combined steel rolling heating furnace, and belongs to the technical field of metallurgical gas furnace kiln heat balance testing. After the method is implemented according to the scheme of the invention, the respective flue gas amount discharged into the main flue, the air-smoke burner and the soot burner after the gas of the combined type steel rolling heating furnace is combusted can be calculated, and the physical heat quantity brought by the flue gas of the main flue, the air-smoke burner and the soot burner can be respectively calculated based on the calculated three flue gas amounts, so that a foundation is laid for the heat balance calculation of the combined type steel rolling heating furnace, and necessary reference data is provided for the energy-saving measures of the type steel rolling heating furnace.

Description

Method for calculating smoke gas amount of combined type steel rolling heating furnace
Technical Field
The invention relates to a method for calculating the smoke gas volume of a combined steel rolling heating furnace, and belongs to the technical field of metallurgical gas furnace kiln heat balance testing.
Background
With the increasing demand and requirements for steel varieties, the steel rolling process is more and more complex, more energy consumption is generated in the process, the heating furnace link is one of the main energy consumption devices, and the fuel consumed by the heating furnace accounts for about 70% of the whole steel rolling process. In view of the energy consumption relationship, on the premise of ensuring normal production, the working condition of the heating furnace is adjusted to ensure that the heating furnace operates in the optimal environment as far as possible, and the energy consumption is reduced to the greatest extent. Therefore, the heat balance test is carried out on the heating furnace by utilizing advanced technology and instruments, the running condition of the heating furnace is known, and the heat balance test device has very important effects on energy conservation and consumption reduction, production cost reduction and product quality improvement in the metallurgical industry. The heating furnace heat balance test is a scientific method for analyzing the energy distribution and utilization level of the heating furnace by enterprises, is an important basic work for improving the energy utilization efficiency, optimizing the energy management system and reducing the energy consumption, and is an important scientific basis for the enterprises to make energy-saving and consumption-reducing measures and carry out enterprise development planning.
The steel rolling heating furnace mainly comprises a heating furnace body, a flue gas waste heat recovery system, a vaporization cooling system, an electric automation system and the like. The heating furnace body is the core equipment of a steel rolling heating furnace system and mainly comprises a furnace body steel structure, a refractory material furnace lining, a fuel combustion system, a steel loading machine, a steel tapping machine, a stepping mechanism, a hydraulic system, a water seal tank, a slag scraping mechanism and the like. In order to have better billet heating quality, the current common steel rolling heating furnace is a preheating section, a heating section and a soaking section three-section heating furnace.
At present, steel rolling heating furnaces are classified into conventional heating furnaces, regenerative heating furnaces and hybrid heating furnaces according to the combustion mode. The flue gas main flue exhaust generated by the combustion of the conventional heating furnace can be directly calculated according to the national standard GBT 33956-.
Relatively speaking, there is not corresponding standard to the calculation of combined type steel rolling heating furnace flue gas volume, and combined type steel rolling heating furnace indicates that there is conventional heating also has the heat accumulation formula heating at the existing conventional heating of same heating furnace combustion method, and generally preheating section, heating section adopt the heat accumulation formula heating mode, and the soaking section adopts the conventional heating mode, and the flue gas divides three routes flue to discharge: the preheating section and the heating section are discharged from an air smoke pipeline and a coal smoke pipeline after heat exchange of a heat accumulator, the residual smoke is discharged from a main flue after convergence of sinking flues at two sides of a furnace wall with a steel port, the main flue is in the consideration of utilization of waste heat of high-temperature smoke, an air heat exchanger is arranged in the main flue and is used for heat exchange of the high-temperature smoke and the smoke of a soaking section so as to improve the temperature of combustion-supporting air before combustion in the furnace, and in this case, the calculation of the smoke quantity of the three paths of smoke cannot be carried out according to corresponding standards or the existing method, so that the calculation of the physical heat brought out by the smoke cannot be carried out.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method for calculating the smoke volume of the combined steel rolling heating furnace is provided, and the smoke volume of the main flue, the empty smoke burner and the soot burner can be accurately calculated.
The technical scheme adopted for solving the technical problems is as follows: the method for calculating the smoke gas amount of the combined type steel rolling heating furnace is characterized by comprising the following steps of:
step one, acquiring the following parameters of the steel rolling heating furnace during testing, namely the water content g of dry airkGas unit consumption B, gas wet composition, combustion air flow V of soaking sectionjkThe sum V of the flue gas temperature and the components in front of the main flue air heat exchanger, the flue gas temperature and the components behind the main flue air heat exchanger, the combustion air temperature and the components in front of the main flue air heat exchanger, the combustion air temperature and the components behind the main flue air heat exchanger, and the air escape quantity of the steel charging hole, the steel tapping hole and the holey4Rated air volume V of air-smoke draught fankyRated air volume V of coal smoke draught fanmy；
Step two, calculating the total amount of the smoke passing through the main flue, the air-smoke burner and the soot burner according to the following formula:
Figure BDA0002785363060000021
in the formula, Vy1The total amount of smoke passing through the main flue, the empty smoke burner and the coal smoke burner is m3/t；
Figure BDA0002785363060000022
The total smoke gas quantity is calculated according to the national standard GBT33956-3/t；
B is the unit consumption of coal gas, namely the fuel quantity per ton of charged material, and the unit is m3/t；
b is a smoke correction coefficient during incomplete combustion;
Figure BDA0002785363060000023
the actual wet flue gas amount in m is the actual wet flue gas amount in the complete combustion3/m3；
Vy4Is the sum of the air escape quantities of the steel charging hole, the steel tapping hole and the hole, and the unit is m3/t；
Step three, calculating the water content H of the flue gas of the main flue according to the following formula2Oy1：
Figure BDA0002785363060000024
In the formula, H2Oy1The water content of flue gas of the main flue is shown in unit of percent;
Figure BDA0002785363060000025
sequentially H in the wet component of the coal gas2Content, CH4Content, CmHnContent, H2S content, H2O content, the unit is;
gkis the water content of dry air, and has a unit of g/m3；
Alpha is the air excess coefficient;
Figure BDA0002785363060000031
is the theoretical amount of dry air in m3/m3；
b is the air excess coefficient during incomplete combustion;
Figure BDA0002785363060000032
the actual wet flue gas amount in m is the actual wet flue gas amount in the complete combustion3/m3；
Step four, calculating the air leakage rate a of the air heat exchanger according to the following formula:
Figure BDA0002785363060000033
in the formula, H2Oy1The water content of flue gas of the main flue is shown in unit of percent;
Figure BDA0002785363060000034
is O in flue gas after the air-out heat exchanger2Content, in%;
Figure BDA0002785363060000035
for O in the front flue gas of the air inlet heat exchanger2Content, in%;
gkis the water content of dry air, and has a unit of g/m3；
Step five, calculating the water content H of the flue gas behind the main flue heat exchanger according to the following formula2Oy2：
Figure BDA0002785363060000036
In the formula, H2Oy2The water content of the flue gas after the main flue heat exchanger is calculated, and the unit is;
H2Oy1the water content of the flue gas of the main flue, namely the water content of the flue gas of the main flue in front of the heat exchanger, is expressed in unit;
a is the air leakage rate of the air heat exchanger, and the unit is percent;
gkis driedWater content of air in g/m3；
Step six, calculating the flue gas volume V of the main flue according to the following formula1：
Firstly, the smoke quantity calculation formula of the smoke entering the main flue under the state that the combustion-supporting air leaks into the main flue is as follows,
Figure BDA0002785363060000037
secondly, the smoke quantity calculation formula of the smoke entering the main flue under the state that the external environment air leaks into the main flue is as follows,
Figure BDA0002785363060000038
in the above two formulae, V1Is the flue gas volume of the main flue and has the unit of m3/t；
VjkThe unit is m/t, and the quantity is the combustion air quantity of the soaking section;
eta is the heat exchange efficiency of the air heat exchanger, and the unit is;
teis the ambient temperature in atmospheric parameters, in units of ℃;
tk1the temperature when the combustion air is discharged from the air heat exchanger is measured in units of;
ty1the temperature of flue gas of a main flue entering an air heat exchanger is measured in units of temperature;
ty2the temperature of the flue gas of the main flue when the flue gas is discharged out of the air heat exchanger is measured in units of temperature;
ck1for combustion air at 0 to tk1Average specific heat capacity of (m) in kJ/(m)3·℃)；
ckeFor combustion air at 0 to teAverage specific heat capacity of (m) in kJ/(m)3·℃)；
cy1Before the flue gas of the main flue enters the air heat exchanger, the temperature is between 0 and ty1Average specific heat capacity of (m) in kJ/(m)3·℃)；
cy1eBefore the flue gas of the main flue enters the air heat exchanger, the temperature is between 0 and teAverage specific heat capacity of (m) in kJ/(m)3·℃)；
cy2After the flue gas of the main flue is discharged from the air heat exchanger, the temperature is between 0 and ty2Average specific heat capacity of (d), (m): kJ/(m)3·℃)；
cy2eAfter the flue gas of the main flue is discharged from the air heat exchanger, the temperature is between 0 and teAverage specific heat capacity of (d), (m): kJ/(m)3·℃)；
a is the air leakage rate of the air heat exchanger, and the unit is percent;
in the calculation formula, the smoke components and the combustion air components are wet components, and the average specific heat capacity calculation formula of the gas between 0 and t is calculated according to the average specific heat capacity calculation formula in GBT 33956-;
step seven, calculating the smoke volume V of the air smoke burner according to the following formulay2And the smoke gas volume V of the soot burnery3：
Figure BDA0002785363060000041
Figure BDA0002785363060000042
In the formula, Vy2The unit of the smoke gas volume of the air smoke burner is m3/t；
Vy3Is the smoke gas quantity of the soot burner in m3/t；
VkyRated air quantity of air-smoke induced draft fan in unit of m3/h；
VmyRated air quantity of the coal smoke induced draft fan, unit is m3/h；
Vy1The total amount of smoke passing through the main flue, the empty smoke burner and the coal smoke burner is m3/t；
V1Is the flue gas volume of the main flue and has the unit of m3/t。
The invention has the beneficial effects that: after the implementation according to the scheme, the flue gas volume V of the main flue can be obtained through calculation in the sixth step1And seventhly, calculating to obtain the smoke volume V of the air-smoke burnery2And the smoke gas volume V of the soot burnery3Therefore, the respective flue gas volume of the three paths of flue gas, namely the main flue, the empty flue gas burner and the soot burner, can be accurately calculated. Based on the calculated three paths of flue gas volume, according to the national standard GBT33956-2017 steel rolling continuous heating furnace heat balance test and calculation method, the physical heat and the heat of chemical incomplete combustion loss brought by the corresponding flue gas can be smoothly calculated, and the energy efficiency condition of the whole combined heating furnace is further calculated, so that a foundation is laid for the heat balance calculation of the combined steel rolling heating furnace, and necessary reference data is also provided for energy-saving measures of the type of steel rolling heating furnace.
Detailed Description
The method mainly aims at the condition that the three paths of flue gas generated by the gas combustion of the existing combined type steel rolling heating furnace cannot be accurately calculated, the flue gas amount of the three paths of flue gas is calculated on the basis of a first law of thermodynamics, a law of mass conservation and a national standard GBT33956 and 2017 continuous steel rolling heating furnace thermal balance test and calculation method on the basis of accurately measuring the working condition parameters and the environmental parameters of the steel rolling heating furnace during the thermal balance test and combining the equipment parameters of the steel rolling heating furnace. The method is specifically divided into the following seven steps:
step one, acquiring the following parameters of the steel rolling heating furnace during testing, namely the water content g of dry airkGas unit consumption B (i.e. fuel amount per ton of charged material), gas wet composition, soaking zone combustion air flow VjkThe sum V of the flue gas temperature and the components in front of the main flue air heat exchanger, the flue gas temperature and the components behind the main flue air heat exchanger, the combustion air temperature and the components in front of the main flue air heat exchanger, the combustion air temperature and the components behind the main flue air heat exchanger, and the air escape quantity of the steel charging hole, the steel tapping hole and the holey4Rated air volume V of air-smoke draught fankyRated air volume V of coal smoke draught fanmy；
Step two, the total amount of the smoke
Figure BDA0002785363060000051
The gas escaping quantity V from the furnace doory4Flue gas volume V of main flue1Air and smoke burner smoke volume Vy2Smoke volume V of soot burnery3Is composed of four parts, namely
Figure BDA0002785363060000052
Vy1＝V1+Vy2+Vy3，
Thus, the total amount of flue gas V passing through the main flue, the empty smoke burner and the soot burnery1Can be calculated according to the following formula:
Figure BDA0002785363060000053
in the formula, Vy1The total amount of smoke passing through the main flue, the empty smoke burner and the coal smoke burner is m3/t；
Figure BDA0002785363060000054
The total smoke gas quantity is calculated according to the national standard GBT33956-3/t；
B is the unit consumption of coal gas, namely the fuel quantity per ton of charged material, and the unit is m3/t；
b is a smoke correction coefficient during incomplete combustion;
Figure BDA0002785363060000061
the actual wet flue gas amount in m is the actual wet flue gas amount in the complete combustion3/m3；
Vy4Is the sum of the air escape quantities of the steel charging hole, the steel tapping hole and the hole, and the unit is m3/t；
Step three, calculating the water content H of the flue gas of the main flue according to the following formula2Oy1：
Figure BDA0002785363060000062
In the formula, H2Oy1The water content of flue gas of the main flue is shown in unit of percent;
Figure BDA0002785363060000063
sequentially H in the wet component of the coal gas2Content, CH4Content, CmHnContent, H2S content, H2O content, the unit is;
gkis the water content of dry air, and has a unit of g/m3；
Alpha is the air excess coefficient;
Figure BDA0002785363060000064
is the theoretical amount of dry air in m3/m3；
b is the air excess coefficient during incomplete combustion;
Figure BDA0002785363060000065
the actual wet flue gas amount in m is the actual wet flue gas amount in the complete combustion3/m3；
Step four, calculating the air leakage rate a of the air heat exchanger according to the following formula:
Figure BDA0002785363060000066
in the formula, H2Oy1The water content of flue gas of the main flue is shown in unit of percent;
Figure BDA0002785363060000067
is O in flue gas after the air-out heat exchanger2Content, in%;
Figure BDA0002785363060000068
for O in the front flue gas of the air inlet heat exchanger2Content, in%;
gkis the water content of dry air, and has a unit of g/m3；
Step five, calculating the water content H of the flue gas behind the main flue heat exchanger according to the following formula2Oy2：
Figure BDA0002785363060000071
In the formula, H2Oy2The water content of the flue gas after the main flue heat exchanger is calculated, and the unit is;
H2Oy1the water content of the flue gas of the main flue, namely the water content of the flue gas of the main flue in front of the heat exchanger, is expressed in unit;
a is the air leakage rate of the air heat exchanger, and the unit is percent;
gkis the water content of dry air, and has a unit of g/m3；
Step six, assuming that the heat exchange efficiency of the air heat exchanger is eta, according to a first law of thermodynamics (i.e. law of conservation of energy), namely that the physical heat brought by the flue gas in the heat exchange process of the eta air heat exchanger is the same as the physical heat sucked by the combustion air, the flue gas volume V of the main flue can be deduced according to the formula1The calculation formula of (a) is as follows:
firstly, the smoke quantity calculation formula of the smoke entering the main flue under the state that the combustion-supporting air leaks into the main flue is as follows,
Figure BDA0002785363060000072
secondly, the smoke quantity calculation formula of the smoke entering the main flue under the state that the external environment air leaks into the main flue is as follows,
Figure BDA0002785363060000073
in the above two formulae, V1Is the flue gas volume of the main flue and has the unit of m3/t；
VjkThe unit is m/t, and the quantity is the combustion air quantity of the soaking section;
eta is the heat exchange efficiency of the air heat exchanger, and the unit is;
teis the ambient temperature in atmospheric parameters, in units of ℃;
tk1the temperature when the combustion air is discharged from the air heat exchanger is measured in units of;
ty1the temperature of flue gas of a main flue entering an air heat exchanger is measured in units of temperature;
ty2the temperature of the flue gas of the main flue when the flue gas is discharged out of the air heat exchanger is measured in units of temperature;
ck1for combustion air at 0 to tk1Average specific heat capacity of (m) in kJ/(m)3·℃)；
ckeFor combustion air at 0 to teAverage specific heat capacity of (m) in kJ/(m)3·℃)；
cy1Before the flue gas of the main flue enters the air heat exchanger, the temperature is between 0 and ty1Average specific heat capacity of (m) in kJ/(m)3·℃)；
cy1eBefore the flue gas of the main flue enters the air heat exchanger, the temperature is between 0 and teAverage specific heat capacity of (m) in kJ/(m)3·℃)；
cy2After the flue gas of the main flue is discharged from the air heat exchanger, the temperature is between 0 and ty2Average specific heat capacity of (d), (m): kJ/(m)3·℃)；
cy2eAfter the flue gas of the main flue is discharged from the air heat exchanger, the temperature is between 0 and teAverage specific heat capacity of (d), (m): kJ/(m)3·℃)；
a is the air leakage rate of the air heat exchanger, and the unit is percent;
in the calculation formula, the smoke components and the combustion air components are wet components, and the average specific heat capacity calculation formula of the gas between 0 and t is calculated according to the average specific heat capacity calculation formula in GBT 33956-;
because the detection results in the existing smoke component detection are dry components, and the wet components of the smoke are needed in the process of calculating the smoke volume of the main flue by the heat balance of the heat exchanger of the main flue, the water content H of the smoke of the main flue needs to be calculated2Oy1(step three), the water content H of the flue gas after the main flue heat exchanger2Oy2(step five); at present, the heat exchanger has a certain air leakage condition more or less, namely, the smoke components before and after the heat exchanger have certain difference, so that the air leakage rate a of the air heat exchanger needs to be calculated (step four); in this application, the water content H of flue gas after the heat exchanger of the main flue is calculated2Oy2The air leakage rate a of the air heat exchanger is used as a calculation parameter H2Oy1、cy1、cy1e、cy2、cy2eThe specific calculation method refers to the thermal balance test and calculation method of GBT33956-2017 steel rolling continuous heating furnace in the national standard; by adopting the calculation mode, the accuracy of the calculation result is fully ensured;
step seven, calculating the total amount V of the smoke passing through the main flue, the empty smoke burner and the coal smoke burner according to the step twoy1And sixthly, calculating the flue gas volume V of the main flue1The sum of the flue gas amount discharged from the air-smoke burner and the soot burner can be calculated, and the rated air amount of the draught fans combining the air smoke and the soot is Vky、VmyAnd calculating to obtain the smoke volume V of the air-smoke burnery2And the smoke gas volume V of the soot burnery3The specific calculation formula is as follows:
Figure BDA0002785363060000081
Figure BDA0002785363060000082
in the formula, Vy2The unit of the smoke gas volume of the air smoke burner is m3/t；
Vy3Is the smoke gas quantity of the soot burner in m3/t；
VkyRated air quantity of air-smoke induced draft fan in unit of m3/h；
VmyRated air quantity of the coal smoke induced draft fan, unit is m3/h；
Vy1The total amount of smoke passing through the main flue, the empty smoke burner and the coal smoke burner is m3/t；
V1Is the flue gas volume of the main flue and has the unit of m3/t。
The method can calculate the respective flue gas amount discharged into the main flue, the air-smoke burner and the soot burner after the gas of the combined type steel rolling heating furnace is combusted through the seven steps, and can calculate the physical heat quantity brought out by the flue gas of the main flue, the air-smoke burner and the soot burner respectively based on the calculated three flue gas amounts, thereby laying a foundation for the heat balance calculation of the combined type steel rolling heating furnace and providing necessary reference data for the energy-saving measures of the type steel rolling heating furnace.
The key point of the method is accurate calculation of the flue gas amount of the main flue, the flue gas amount of the air-flue burner and the flue gas amount of the soot burner, and specific calculation of physical heat can be implemented by referring to the national standard GBT33956 and 2017 steel rolling continuous heating furnace heat balance test and calculation method, which is not described in detail herein.
Example 1
Dry air water content g during test in a steel rolling furnacek＝9.7g/m3(ii) a Coal gas unit consumption (blast furnace coal gas is adopted in the preheating section and the heating section, the blast furnace coal gas unit consumption is 345.31m3T; the soaking section adopts mixed gas, the unit consumption of the mixed gas is as follows: 13.29m3T), the wet gas component is calculated according to the flow weighted average of the two components, and the result is shown in table 1; combustion air flow V of soaking sectionjk＝81.20m3T; the temperature and the composition of combustion air and flue gas in front of and behind the main flue air heat exchanger are shown in a table 2; in the embodiment, only the steel charging hole and the steel tapping hole are provided, and the sum V of the gas escape amounts of the steel charging hole and the steel tapping holey4＝32.28m3T; rated air volume V of air-smoke draught fanky＝98000m3Rated wind of/h, coal smoke draught fanQuantity Vmy＝140000m3H is used as the reference value. According to the steps of the invention, the total smoke quantity is calculated to be 643.24m3T, the front flue gas amount of the main flue air heat exchanger is 112.77m3T, the front flue gas amount of the air-flue burner is 205.14m3T, the front flue gas amount of the soot burner is 293.06m3/t。
TABLE 1 weighted calculated gas composition
Kind of gas CO2 CmHn CO O2 H2 CH4 N2 H2O
Blast furnace gas 16.3 0.0 23.0 0.3 1.1 0.2 56.9 2.2
Mixed gas 7.3 1.0 13.6 0.2 25.1 8.6 39.9 4.4
Weighted coal gas composition 16.0 0.0 22.6 0.3 2.0 0.5 56.3 2.3
TABLE 2 temperatures and compositions of combustion air and flue gas before and after main flue air heat exchanger
Figure BDA0002785363060000091
Example 2
Dry air water content g during test in a steel rolling furnacek＝9.7g/m3(ii) a Coal gas unit consumption (blast furnace coal gas is adopted in the preheating section and the heating section, the blast furnace coal gas unit consumption is 354.97m3T; the soaking section adopts mixed gas, the unit consumption of the mixed gas is as follows: 13.29m3T), the wet gas component is calculated according to the flow weighted average of the two components, and the result is shown in table 3; soaking heatSectional combustion air flow Vjk＝12.01m3T; the temperature and the composition of the front and the back combustion air and the flue gas of the main flue air heat exchanger are shown in a table 4; in the embodiment, only the steel charging hole and the steel tapping hole are provided, and the sum V of the gas escape amounts of the steel charging hole and the steel tapping holey4＝43.38m3T; rated air volume V of air-smoke draught fanky＝98000m3Rated air volume V of draught fan for coal smokemy＝140000m3H is used as the reference value. According to the steps of the invention, the total smoke quantity is calculated to be 532.17m3T, the front flue gas amount of the main flue air heat exchanger is 113.80m3T, the front flue gas amount of the air-flue burner is 154.41m3T, the front flue gas amount of the soot burner is 220.58m3/t。
TABLE 3 weighted calculated gas composition
Kind of gas CO2 CmHn CO O2 H2 CH4 N2 H2O
Blast furnace gas 18.6 0.0 19.4 0.4 0.8 0.2 58.3 2.4
Mixed gas 11.4 0.8 18.9 0.2 27.2 9.1 30.4 1.9
Weighted coal gas composition 18.3 0.0 19.4 0.4 1.7 0.5 57.3 2.3
TABLE 4 temperatures and compositions of combustion air and flue gas before and after main flue air heat exchanger
Figure BDA0002785363060000101

Claims (1)

1. The method for calculating the smoke gas amount of the combined type steel rolling heating furnace is characterized by comprising the following steps of:
step one, acquiring the following parameters of the steel rolling heating furnace during testing, namely the water content g of dry airkGas unit consumption B, gas wet composition, combustion air flow V of soaking sectionjkThe sum V of the flue gas temperature and the components in front of the main flue air heat exchanger, the flue gas temperature and the components behind the main flue air heat exchanger, the combustion air temperature and the components in front of the main flue air heat exchanger, the combustion air temperature and the components behind the main flue air heat exchanger, and the air escape quantity of the steel charging hole, the steel tapping hole and the holey4Rated air volume V of air-smoke draught fankyRated air volume V of coal smoke draught fanmy；
Step two, calculating the total amount of the smoke passing through the main flue, the air-smoke burner and the soot burner according to the following formula:
Figure FDA0002785363050000011
in the formula, Vy1The total amount of smoke passing through the main flue, the empty smoke burner and the coal smoke burner is m3/t；
Figure FDA0002785363050000016
The total smoke gas quantity is calculated according to the national standard GBT33956-3/t；
B is the unit consumption of coal gas, namely the fuel quantity per ton of charged material, and the unit is m3/t；
b is a smoke correction coefficient during incomplete combustion;
Figure FDA0002785363050000017
the actual wet flue gas amount in m is the actual wet flue gas amount in the complete combustion3/m3；
Vy4The sum of the air escape quantities of the steel charging hole, the steel tapping hole and the hole is m 3/t;
step three, calculating the water content H of the flue gas of the main flue according to the following formula2Oy1：
Figure FDA0002785363050000012
In the formula, H2Oy1The water content of flue gas of the main flue is shown in unit of percent;
Figure FDA0002785363050000013
sequentially H in the wet component of the coal gas2Content, CH4Content, CmHnContent, H2S content, H2O content, the unit is;
gkis the water content of dry air, and has a unit of g/m3；
Alpha is the air excess coefficient;
Figure FDA0002785363050000014
is the theoretical amount of dry air in m3/m3；
b is the air excess coefficient during incomplete combustion;
Figure FDA0002785363050000015
the actual wet flue gas amount in m is the actual wet flue gas amount in the complete combustion3/m3；
Step four, calculating the air leakage rate a of the air heat exchanger according to the following formula:
Figure FDA0002785363050000021
in the formula, H2Oy1The water content of flue gas of the main flueThe bit is;
Figure FDA0002785363050000022
is O in flue gas after the air-out heat exchanger2Content, in%;
Figure FDA0002785363050000023
for O in the front flue gas of the air inlet heat exchanger2Content, in%;
gkis the water content of dry air, and has a unit of g/m3；
Step five, calculating the water content H of the flue gas behind the main flue heat exchanger according to the following formula2Oy2：
Figure FDA0002785363050000024
In the formula, H2Oy2The water content of the flue gas after the main flue heat exchanger is calculated, and the unit is;
H2Oy1the water content of the flue gas of the main flue, namely the water content of the flue gas of the main flue in front of the heat exchanger, is expressed in unit;
a is the air leakage rate of the air heat exchanger, and the unit is percent;
gkis the water content of dry air, and has a unit of g/m3；
Step six, calculating the flue gas volume V of the main flue according to the following formula1：
Firstly, the smoke quantity calculation formula of the smoke entering the main flue under the state that the combustion-supporting air leaks into the main flue is as follows,
Figure FDA0002785363050000025
secondly, the smoke quantity calculation formula of the smoke entering the main flue under the state that the external environment air leaks into the main flue is as follows,
Figure FDA0002785363050000026
in the above two formulae, V1Is the flue gas volume of the main flue and has the unit of m3/t；
VjkThe unit is m/t, and the quantity is the combustion air quantity of the soaking section;
eta is the heat exchange efficiency of the air heat exchanger, and the unit is;
teis the ambient temperature in atmospheric parameters, in units of ℃;
tk1the temperature when the combustion air is discharged from the air heat exchanger is measured in units of;
ty1the temperature of flue gas of a main flue entering an air heat exchanger is measured in units of temperature;
ty2the temperature of the flue gas of the main flue when the flue gas is discharged out of the air heat exchanger is measured in units of temperature;
ck1for combustion air at 0 to tk1Average specific heat capacity of (m) in kJ/(m)3·℃)；
ckeFor combustion air at 0 to teAverage specific heat capacity of (m) in kJ/(m)3·℃)；
cy1Before the flue gas of the main flue enters the air heat exchanger, the temperature is between 0 and ty1Average specific heat capacity of (m) in kJ/(m)3·℃)；
cy1eBefore the flue gas of the main flue enters the air heat exchanger, the temperature is between 0 and teAverage specific heat capacity of (m) in kJ/(m)3·℃)；
cy2After the flue gas of the main flue is discharged from the air heat exchanger, the temperature is between 0 and ty2Average specific heat capacity of (d), (m): kJ/(m)3·℃)；
cy2eAfter the flue gas of the main flue is discharged from the air heat exchanger, the temperature is between 0 and teAverage specific heat capacity of (d), (m): kJ/(m)3·℃)；
a is the air leakage rate of the air heat exchanger, and the unit is percent;
in the calculation formula, the smoke components and the combustion air components are wet components, and the average specific heat capacity calculation formula of the gas between 0 and t is calculated according to the average specific heat capacity calculation formula in GBT 33956-;
step seven, calculating the smoke volume V of the air smoke burner according to the following formulay2And the smoke gas volume V of the soot burnery3：
Figure FDA0002785363050000031
Figure FDA0002785363050000032
In the formula, Vy2The unit of the smoke gas volume of the air smoke burner is m3/t；
Vy3Is the smoke gas quantity of the soot burner in m3/t；
VkyRated air quantity of air-smoke induced draft fan in unit of m3/h；
VmyRated air quantity of the coal smoke induced draft fan, unit is m3/h；
Vy1The total amount of smoke passing through the main flue, the empty smoke burner and the coal smoke burner is m3/t；
V1Is the flue gas volume of the main flue and has the unit of m3/t。
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