A calculation method for flue gas composition of a double regenerative steel rolling heating furnace

Abstract

The present invention relates to a method for calculating the composition of flue gas from a dual regenerative steel rolling heating furnace, comprising the following steps: obtaining the dry component content and moisture content of coal gas, the smoke and air smoke component content, and the dry air moisture content; setting an initial value for the moisture content in the flue gas, calculating the residual gas rate in the smoke regenerator and the residual air rate in the air regenerator based on the carbon dioxide and nitrogen balance equations; calculating the dry component content of the flue gas; calculating the excess air coefficient, theoretical dry air volume, theoretical dry flue gas volume, actual wet flue gas volume, and incomplete combustion flue gas volume correction coefficient; calculating the moisture content in the flue gas; replacing the initial value with the calculated moisture content value, and repeating the above steps until the difference between the two is very small, stopping the calculation, and obtaining the flue gas component content, the residual gas rate in the smoke regenerator, and the residual air rate in the air regenerator at this time, thereby completing the furnace combustion calculation. The present invention can clearly define the combustion state in the heating furnace and the air and gas leakage rates.

Description

Technical Field

[0001] The invention belongs to the technical field of thermal energy conservation, and in particular relates to a method for calculating the composition of flue gas generated by a double-heat storage steel rolling heating furnace. Background Art

[0002] In the context of the dual carbon economy, promoting extreme energy efficiency in the steel industry is imperative. Steel rolling is a crucial production process in the steel industry, and heating accounts for 70% of the energy consumption in the rolling process. Therefore, energy conservation and consumption reduction in heating furnaces are particularly critical.

[0003] Conducting a heat balance test on a heating furnace is an effective way to clarify the furnace's energy efficiency level and expose system problems. However, for the dual heat storage combustion mode of air and gas, it is impossible to directly measure the composition of the flue gas generated by the furnace, and thus it is impossible to perform combustion calculations of the furnace combustion process, nor can it determine the rationality of the air-to-coal ratio and the completeness of combustion.

[0004] To simplify calculations, the weighted average of the flue gas compositions from the air and coal flues is sometimes used as the raw flue gas composition for combustion calculations. However, due to the characteristics of regenerative combustion, air remains in the air flue regenerator after reversal. Consequently, residual air is mixed into the air flue, and similarly, residual coal gas is mixed into the coal flue. The composition of air and coal smoke differs significantly from that of raw flue gas. Without the raw flue gas composition, it's impossible to calculate the residual amounts of air and gas, which significantly impacts the heating load entering the furnace for combustion.

[0005] At present, there are no corresponding standard regulations for the thermal balance test calculation of double regenerative furnaces, and no reports on the calculation of furnace flue gas components were found in the relevant literature.

[0006] Therefore, the present invention deduces the residual rates of gas and air during the regenerator reversal process by analyzing the equilibrium relationship of the components (CO2 and N2) in the flue gas with relatively obvious content changes before and after the regenerator. From this, the composition of the furnace-generated flue gas can be reversely calculated. On the one hand, furnace combustion calculations can be performed, and on the other hand, the residual amounts of air and gas can be calculated. Summary of the Invention

[0007] The purpose of the present invention is to provide a method for calculating the composition of the flue gas generated by the double regenerative steel rolling heating furnace. The principle of conservation of matter and the iterative method are used to calculate the flue gas composition generated by the combustion inside the furnace of the double regenerative heating furnace and the composition of the flue gas generated by the furnace. At the same time, the proportion of air entering the air smoke and the proportion of gas entering the coal smoke are obtained. Based on this, the combustion state in the heating furnace and the air and gas leakage rates can be clearly determined.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0009] According to one aspect of the present invention, a method for calculating the composition of flue gas generated by a double regenerative steel rolling heating furnace is provided, comprising the following steps:

[0010] 1) Obtain the dry component content and moisture content of coal gas, obtain the smoke gas component content, obtain the air smoke gas component content and calculate the dry air moisture content;

[0011] 2) setting an initial value for the moisture content of the flue gas, and calculating the residual gas rate in the soot regenerator and the residual air rate in the air regenerator based on the value obtained in step 1), the set initial value for the moisture content of the flue gas, and the balance equation for carbon dioxide and nitrogen;

[0012] 3) The dry component content of the flue gas is calculated based on the residual gas rate in the soot regenerator, the residual air rate in the air regenerator, the soot gas component content, and the air gas component content;

[0013] 4) The wet content of the coal gas is calculated from the dry content and moisture content of the coal gas. Then, based on the wet content of the coal gas and the dry content of the flue gas, the excess air coefficient, theoretical dry air volume, theoretical dry flue gas volume, actual wet flue gas volume, and correction factor for incomplete combustion flue gas volume of the furnace combustion process are calculated.

[0014] 5) The moisture content in the flue gas is calculated based on the wet content of the coal gas, the excess air coefficient, the theoretical dry air volume, the flue gas correction coefficient for incomplete combustion, the actual wet flue gas volume and the moisture content of the dry air;

[0015] 6) Use the calculated moisture content value to replace the set initial value and repeat the calculation from step 1) to step 5) until the difference in moisture content between the two is very small. Stop the calculation and obtain the furnace flue gas component content, coal smoke regenerator gas residual rate and air residual rate in the air smoke regenerator at this time to complete the furnace combustion calculation.

[0016] In one embodiment of the present invention, in step 1), the dry component content of the coal gas is measured by a coal gas analyzer, and the moisture content in the coal gas is obtained by testing with a moisture meter; the smoke gas component content and the air smoke gas component content are both obtained by on-site testing with a smoke analyzer.

[0017] In one embodiment of the present invention, in step 1), the moisture content of dry air is calculated by dry-bulb temperature, wet-bulb temperature, relative humidity and saturated vapor pressure.

[0018] In one embodiment of the present invention, in step 2), the residual gas rate in the soot regenerator and the residual air rate in the air regenerator are calculated by the following formulas:

[0019] ;

[0020] ;

[0021] Among them, in the formula, a m : Gas residual rate in soot regenerator; a k : Air residual rate in the smoke regenerator; H2O n : moisture content in flue gas; H2O g : moisture content in coal gas; CO g 2,m : Carbon dioxide content in soot flue gas; CO g 2,k : Carbon dioxide content in air smoke; CO g 2,g : Carbon dioxide content in dry gas; N g 2,m : nitrogen content in soot flue gas; N g 2,k : nitrogen content in air smoke; N g 2,g : Nitrogen content in dry gas; g k : Dry air moisture content, g / m 3 .

[0022] In one embodiment of the present invention, in step 3), the dry component content of the flue gas is calculated as follows:

[0023] ;

[0024] ;

[0025] ;

[0026] ;

[0027] ;

[0028] ;

[0029] Among them, in the formula, CO g 2,n , O g 2,n 、CO g n 、H g 2,n 、CH g 4,n 、N g 2,n : Carbon dioxide content, oxygen content, carbon monoxide content, hydrogen content, methane content, nitrogen content in the dry components of the flue gas; CO g 2,k, O g 2,k 、CO g k 、H g 2,k 、CH g 4,k : Carbon dioxide content, oxygen content, carbon monoxide content, hydrogen content, and methane content in air smoke.

[0030] In one embodiment of the present invention, in step 4):

[0031] The excess air coefficient is calculated as follows:

[0032] ;

[0033] The theoretical dry air volume is calculated as follows:

[0034] ;

[0035] The theoretical dry flue gas volume is calculated as follows:

[0036] ;

[0037] The actual wet flue gas volume is calculated as follows:

[0038] ;

[0039] The calculation formula for the flue gas correction coefficient during incomplete combustion is as follows:

[0040] ;

[0041] Where, α: excess air coefficient; L0 R : Theoretical dry air volume; V0 g : Theoretical dry flue gas volume; V n s : actual wet flue gas volume; b: correction coefficient for complete combustion flue gas volume; SO g 2,n : Sulfur dioxide content in dry components of flue gas; H2O ,g s 、H 2,g s , O 2,g s 、CO s 2,g 、CO g s 、CH s 4,g 、C m H s n,g (m>1), H2S,g s : Water content, hydrogen content, oxygen content, carbon dioxide content, carbon monoxide content, methane content, heavy hydrocarbon content, and hydrogen sulfide content in the wet components of coal gas.

[0042] In one embodiment of the present invention, in step 5), the calculation formula for the moisture content in the flue gas generated by the furnace is as follows:

[0043] .

[0044] In one embodiment of the present invention, in step 6), the calculations from step 1) to step 5) are repeated until the difference between the calculated moisture content of the flue gas and the set moisture content of the flue gas satisfies the following formula, and the calculation is stopped:

[0045] .

[0046] In one embodiment of the present invention, the content of components in the flue gas obtained in step 6) includes the content of dry components in the flue gas and the content of wet components in the flue gas.

[0047] By adopting the above technical solution, the present invention has the following advantages compared with the prior art:

[0048] The present invention calculates the composition of the flue gas generated by the furnace and thus clarifies the combustion state in the heating furnace and the air and gas leakage rates, thereby formulating targeted measures to improve the combustion efficiency in the furnace, reduce the leakage rate, and achieve significant energy-saving and consumption-reducing effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 The present invention provides a flow chart of a method for calculating the composition of flue gas generated by a double regenerative steel rolling heating furnace. DETAILED DESCRIPTION

[0050] It should be understood that the embodiments of the present invention shown in the exemplary embodiments are merely illustrative. Although only a few embodiments have been described in detail in the present invention, it is readily apparent to those skilled in the art that various modifications are feasible without departing substantially from the teachings of the subject matter of the present invention. Accordingly, all such modifications should be included within the scope of the present invention. Without departing from the gist of the present invention, other replacements, modifications, variations, and deletions may be made to the design, operating conditions, and parameters of the following exemplary embodiments.

[0051] like Figure 1 As shown, the present invention provides a method for calculating the composition of flue gas generated by a double regenerative steel rolling heating furnace, comprising the following steps:

[0052] Step S101: Obtain the dry component content and moisture content of coal gas, obtain the smoke component content, obtain the smoke component content of air smoke, and calculate the dry air moisture content;

[0053] Step S102: setting an initial value for the moisture content of the flue gas generated by the furnace, and calculating the residual gas rate in the soot regenerator and the residual air rate in the air regenerator based on the value obtained in step 1), the set initial value for the moisture content of the flue gas generated by the furnace, and the balance equation of carbon dioxide and nitrogen;

[0054] Step S103: Calculating the dry component content of the flue gas based on the residual gas rate in the soot regenerator, the residual air rate in the air regenerator, the soot gas component content, and the air gas component content;

[0055] Step S104: Calculate the wet content of the coal gas from the dry content and the moisture content of the coal gas, and then calculate the excess air coefficient, theoretical dry air volume, theoretical dry flue gas volume, actual wet flue gas volume, and incomplete combustion flue gas volume correction coefficient for the furnace combustion process based on the wet content of the coal gas and the dry content of the flue gas produced by the furnace;

[0056] Step S105: Calculate the moisture content of the flue gas from the furnace based on the wet content of the coal gas, the excess air coefficient, the theoretical dry air volume, the flue gas correction coefficient for incomplete combustion, the actual wet flue gas volume, and the moisture content of the dry air;

[0057] Step S106: Use the calculated moisture content value to replace the set initial value, and repeat the calculation from step S101 to step S105 until the difference in moisture content between the two is very small. Stop the calculation and obtain the furnace flue gas component content, coal gas residual rate in the coal smoke regenerator, and air residual rate in the air smoke regenerator at this time, and complete the furnace combustion calculation.

[0058] The present invention calculates the composition of the flue gas generated by the furnace and thus clarifies the combustion state in the heating furnace and the air and gas leakage rates, thereby formulating targeted measures to improve the combustion efficiency in the furnace, reduce the leakage rate, and achieve significant energy-saving and consumption-reducing effects.

[0059] In the above calculation method, in step S101, the dry component content of the coal gas is measured by a flue gas analyzer, and the moisture content in the coal gas is obtained by testing with a moisture meter; the smoke gas component content and the air smoke gas component content are both obtained through on-site testing with a flue gas analyzer; and the moisture content of dry air is calculated using the dry-bulb temperature, wet-bulb temperature, relative humidity, and saturated vapor pressure.

[0060] In the above calculation method, in step S102, the residual gas rate in the soot regenerator and the residual air rate in the air regenerator are calculated using the following formulas:

[0061] ;

[0062] ;

[0063] Among them, in the formula, a m : Gas residual rate in soot regenerator; a k : Air residual rate in the smoke regenerator; H2O n : moisture content in flue gas; H2O g : moisture content in coal gas; CO g 2,m : Carbon dioxide content in soot flue gas; CO g 2,k : Carbon dioxide content in air smoke; CO g 2,g : Carbon dioxide content in dry gas; N g 2,m : nitrogen content in soot flue gas; N g 2,k : nitrogen content in air smoke; N g 2,g : Nitrogen content in dry gas; g k : Dry air moisture content, g / m 3 .

[0064] In the above calculation method, in step S103, the dry component content of the flue gas is calculated as follows:

[0065] ;

[0066] ;

[0067] ;

[0068] ;

[0069] ;

[0070] ;

[0071] Among them, in the formula, CO g 2,n , O g 2,n 、CO g n 、H g 2,n 、CH g 4,n 、N g 2,n : Carbon dioxide content, oxygen content, carbon monoxide content, hydrogen content, methane content, nitrogen content in the dry components of the flue gas; CO g2,k , O g 2,k 、CO g k 、H g 2,k 、CH g 4,k : Carbon dioxide content, oxygen content, carbon monoxide content, hydrogen content, and methane content in air smoke.

[0072] In the above calculation method, in step S104:

[0073] The excess air coefficient is calculated as follows:

[0074] ;

[0075] The theoretical dry air volume is calculated as follows:

[0076] ;

[0077] The theoretical dry flue gas volume is calculated as follows:

[0078] ;

[0079] The actual wet flue gas volume is calculated as follows:

[0080] ;

[0081] The calculation formula for the flue gas correction coefficient during incomplete combustion is as follows:

[0082] ;

[0083] Where, α: excess air coefficient; L0 R : Theoretical dry air volume; V0 g : Theoretical dry flue gas volume; V n s : actual wet flue gas volume; b: correction coefficient for complete combustion flue gas volume; SO g 2,n : Sulfur dioxide content in dry components of flue gas; H2O ,g s 、H 2,g s , O 2,g s 、CO s 2,g 、CO g s 、CH s 4,g 、C m H s n,g(m>1), H2S ,g s : Water content, hydrogen content, oxygen content, carbon dioxide content, carbon monoxide content, methane content, heavy hydrocarbon content, and hydrogen sulfide content in the wet components of coal gas.

[0084] In the above calculation method, in step S105, the calculation formula for the moisture content in the flue gas generated by the furnace is as follows:

[0085] .

[0086] In the above calculation method, in step S106, the calculations from step S101 to step S105 are repeated until the difference between the calculated moisture content of the flue gas and the set moisture content of the flue gas satisfies the following formula, at which point the calculation is stopped:

[0087] ;

[0088] The obtained content of components in the flue gas includes the dry content and the wet content of the flue gas.

[0089] The above technical solution of the present invention is described below through specific embodiments.

[0090] In the embodiment of the present invention, a thermal test was conducted on a dual regenerative heating furnace of a certain factory, and the flue gas composition was calculated by the following steps. The specific steps of the method for calculating the flue gas composition of the dual regenerative steel rolling heating furnace provided by the present invention are as follows:

[0091] (1) Obtain known parameters and determine the parameters to be determined:

[0092] (1.1) Known parameters

[0093] The dry component content of coal gas can be 、 (m>1), 、 、 、 、 , the moisture content is The dry content is measured by gas analyzer, and the moisture content is measured by moisture meter. Based on the dry content and moisture content of gas, the corresponding wet content of gas is obtained. 、 、 、 、 、 、 .

[0094] The components of soot flue gas are 、 、 、 、 、 ;

[0095] The components of air smoke are 、 、 、 、 、 ;

[0096] The composition of soot and air flue gas can be tested on site using a flue gas analyzer.

[0097] Dry air moisture content g k , g / m 3 , calculated through parameters such as dry-bulb temperature, wet-bulb temperature, relative humidity, and saturated vapor pressure.

[0098] In the embodiment of the present invention, the heating furnace uses blast furnace gas as fuel, a gas analyzer is used to analyze the content of each component in the blast furnace gas, and a moisture meter is used to analyze the moisture content in the blast furnace gas. The specific values ​​are shown in Table 1.

[0099] Table 1 Composition of blast furnace gas

[0100]

[0101] The smoke components of air and coal smoke were tested by a flue gas analyzer, as shown in Table 2.

[0102] Table 2 Flue gas components

[0103]

[0104] Dry air moisture content g k Calculated based on dry bulb temperature, wet bulb temperature, relative humidity and other parameters, g k =16.3g / m 3 .

[0105] (1.2) Parameters to be requested:

[0106] Gas residual rate in the soot regenerator (ratio of residual gas volume to exhaust gas volume)a m .

[0107] Air residual rate in the air-smoke regenerator (ratio of residual air volume to exhaust flue gas volume)a k .

[0108] Dry components of flue gas: CO g 2，n 、CO g n 、H g 2，n、CH g 4，n 、N g 2，n ; Moisture content in flue gas: H2O n ; Furnace flue gas wet components: CO s 2，n 、CO s n 、H s 2，n 、CH s 4，n 、N s 2.

[0109] (2) Furnace combustion calculation

[0110] (2.1) Assume that the initial value of moisture content in flue gas is

[0111] Assume that the initial value of moisture content of flue gas is H2O n 6%;

[0112] Assume that the ratio of the residual air volume in the air thermal storage chamber to the exhaust gas volume is a k ,

[0113] Assume that the ratio of the residual gas volume in the gas thermal storage chamber to the exhaust gas volume is a m .

[0114] (2.2) Calculate a m 、a k

[0115] Calculated using the CO2, N2 balance method

[0116] According to the CO2 balance:

[0117] CO2 in the flue gas entering the coal smoke regenerator + CO2 in the coal gas remaining in the coal smoke regenerator = CO2 in the coal smoke leaving the coal smoke regenerator

[0118] Therefore, 1m 3 The CO2 balance before and after the flue gas passes through the soot regenerator is:

[0119] (2-1)

[0120] Similarly, get 1m 3 The CO2 balance of flue gas before and after passing through the air smoke regenerator is (assuming the CO2 content in the air is 0):

[0121] (2-2)

[0122] According to N2 balance, 1m 3The N2 balance of the flue gas before and after passing through the coal smoke regenerator and the air smoke regenerator is:

[0123] (2-3)

[0124] (2-4)

[0125] Formula (2-1) and formula (2-2) are combined to get:

[0126] (2-5)

[0127] Formula (2-3) and formula (2-4) are combined to get:

[0128] (2-6)

[0129] Simplifying formula (2-5) and formula (2-6), we get

[0130] (2-7)

[0131] (2-8)

[0132] Combining equations (2-7) and (2-8), we get

[0133] (2-9)

[0134] (2-10)

[0135] In this embodiment, the known parameters are substituted into equations (2-9) and (2-10) to obtain a k =18.032%, a m =1.941%.

[0136] (3) Calculate the dry content of each component of flue gas

[0137] According to the gas residual rate a m , air residual rate a k , combined with the actually measured soot components and air smoke components, the calculated values ​​of the content of each component in the flue gas are obtained.

[0138] (3-1)

[0139] (3-2)

[0140] (3-3)

[0141] (3-4) (3-5) (3-6)

[0142] In this embodiment, based on known conditions and in combination with equations (3-1) to (3-6), the composition of the flue gas is calculated. According to the set moisture content H2O n (6%), the wet composition of the flue gas was calculated, as shown in Table 3.

[0143] Table 3 Composition of flue gas from furnace

[0144]

[0145] (4) Combustion calculation

[0146] The excess air coefficient α and the theoretical dry air volume L0 of the furnace combustion process are calculated based on the wet composition of the coal gas and the dry composition of the flue gas. R , Theoretical dry flue gas volume V0 g , actual wet flue gas volume V n s And the correction factor b for incomplete combustion flue gas volume.

[0147] (4.1) Calculate the excess air coefficient α:

[0148] (4-1)

[0149] In this embodiment, the excess air coefficient is calculated based on the coal gas composition and the flue gas composition, and α=1.31.

[0150] (4.2) Calculate the theoretical dry air volume L0 R :

[0151] (4-2)

[0152] In this embodiment, the theoretical dry air volume L0 is calculated based on the wet composition of the coal gas. R =0.6168.

[0153] (4.3) Calculate the theoretical dry flue gas volume V0 g :

[0154] (4-3)

[0155] In this embodiment, the theoretical dry flue gas volume V0 is calculated based on the wet composition of the coal gas. g =1.0478.

[0156] (4.4) Calculate the actual wet flue gas volume V n s :

[0157] (4-4)

[0158] In this embodiment, substituting the known conditions into V n s =1.2547.

[0159] (4.5) Calculate the smoke correction factor b for incomplete combustion:

[0160] (4-5)

[0161] In this embodiment, the dry content of the flue gas generated by the furnace is substituted into b=1.0001.

[0162] (5) Verification of moisture content of flue gas

[0163] The moisture content H2O in the flue gas is calculated based on the wet composition of the coal gas, the theoretical dry air volume, the flue gas correction coefficient during incomplete combustion, the actual wet flue gas volume and other parameters. n :

[0164] (5-1)

[0165] Calculated H2O n =7.094%.

[0166] (6) Iterative calculation

[0167] H2O calculated using formula (5-1) in step (5) n Replace the initial value with the value and repeat the calculation of step 1 to step 5 until the difference between the set moisture value and the calculated moisture value is small enough, that is, , stop the calculation, and get the flue gas composition and a m 、a k , the furnace combustion calculation is completed.

[0168] In this embodiment, the calculated H2O n The value is 7.094%, which is different from the set value of 6%. Change the set value to 7.094% and repeat steps 1-5 to obtain H2O n The calculated value is 7.094009%, then

[0169] , the calculation ends.

[0170] At this time, the calculated flue gas composition is shown in Table 4.

[0171] Table 4 Composition of flue gas from furnace

[0172]

[0173] At this time, a k =17.82%, am =1.92%.

[0174] It can be seen that the present invention calculates the composition of the flue gas generated by the furnace and thus clarifies the combustion state in the heating furnace and the air and gas leakage rates, so as to formulate targeted measures to improve the combustion efficiency in the furnace, reduce the leakage rate, and achieve significant energy-saving and consumption-reducing effects.

[0175] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. If the present invention is modified or replaced with equivalents without departing from the spirit and scope of the present invention, it should be included in the scope of protection of the claims of the present invention.

Claims

1. A method for calculating the flue gas composition of a double regenerative steel rolling heating furnace, characterized in that: The following steps are involved: 1) Obtain the dry component content and moisture content of coal gas, obtain the smoke gas component content, obtain the air smoke gas component content and calculate the dry air moisture content; 2) Set the initial value of the moisture content in the flue gas, and based on the value obtained in step 1), the set initial value of the moisture content in the flue gas, and the balance equation of carbon dioxide and nitrogen, calculate the gas residual rate in the soot regenerator and the air residual rate in the air regenerator using the following formula: ； ； Among them, in the formula, a m : Gas residual rate in soot regenerator; a k : Air residual rate in the smoke regenerator; H2O n : moisture content in flue gas; H2O g : moisture content in coal gas; CO g 2,m : Carbon dioxide content in soot flue gas; CO g 2,k : Carbon dioxide content in air smoke; CO g 2,g : Carbon dioxide content in dry gas; N g 2,m : nitrogen content in soot flue gas; N g 2,k : nitrogen content in air smoke; N g 2,g : Nitrogen content in dry gas; g k : Dry air moisture content, g / m 3 ; 3) Based on the residual gas rate in the soot regenerator, the residual air rate in the air regenerator, the soot gas component content, and the air gas component content, the dry component content of the flue gas is calculated using the following formula: ； ； ； ； ； ； Among them, in the formula, CO g 2,n , O g 2,n 、CO g n 、H g 2,n 、CH g 4,n 、N g 2,n : Carbon dioxide content, oxygen content, carbon monoxide content, hydrogen content, methane content, nitrogen content in the dry components of the flue gas; CO g 2,k , O g 2,k 、CO g k 、H g 2,k 、CH g 4,k : Carbon dioxide content, oxygen content, carbon monoxide content, hydrogen content, and methane content in air smoke; 4) The wet content of the coal gas is calculated from the dry content and moisture content of the coal gas. Then, based on the wet content of the coal gas and the dry content of the flue gas, the excess air coefficient, theoretical dry air volume, theoretical dry flue gas volume, actual wet flue gas volume, and correction factor for incomplete combustion flue gas volume of the furnace combustion process are calculated. 5) The moisture content in the flue gas is calculated using the following formula based on the wet content of the coal gas, the excess air coefficient, the theoretical dry air volume, the flue gas correction coefficient for incomplete combustion, the actual wet flue gas volume, and the moisture content of the dry air: ， Where α: excess air coefficient; L0 R : Theoretical dry air volume; V n s : actual wet flue gas volume; b: correction coefficient of complete combustion flue gas volume; H 2,g s 、CH s 4,g 、C2H s 4,g : Hydrogen content, methane content, and heavy hydrocarbon content in the wet components of coal gas; 6) Use the calculated moisture content value to replace the set initial value and repeat the calculation from step 1) to step 5) until the difference in moisture content between the two is very small. Stop the calculation and obtain the furnace flue gas component content, coal smoke regenerator gas residual rate and air residual rate in the air smoke regenerator at this time to complete the furnace combustion calculation.

2. The method for calculating the flue gas composition of a double regenerative steel rolling heating furnace according to claim 1 is characterized in that: In step 1), the dry component content of the coal gas is measured by a coal gas analyzer, and the moisture content in the coal gas is obtained by testing with a moisture meter; the smoke gas component content and the air smoke gas component content are both obtained by on-site testing with a flue gas analyzer.

3. The method for calculating the flue gas composition of a double regenerative steel rolling heating furnace according to claim 1, characterized in that: In step 1), the dry air moisture content is calculated using the dry-bulb temperature, wet-bulb temperature, relative humidity, and saturated vapor pressure.

4. The method for calculating the flue gas composition of a double regenerative steel rolling heating furnace according to claim 1, characterized in that: In step 6), the calculations from step 1) to step 5) are repeated until the difference between the calculated moisture content of the flue gas and the set moisture content of the flue gas satisfies the following formula: 。 5. The method for calculating the flue gas composition of a double regenerative steel rolling heating furnace according to claim 4, characterized in that: The content of components in the flue gas obtained in step 6) includes the dry content and the wet content of the flue gas.

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