Method for calculating combustion air quantity and air excess coefficient of coal gas and coal powder mixed combustion furnace

Abstract

The application discloses a kind of combustion air quantity and air excess coefficient calculation method of coal gas and coal powder mixed combustion furnace kiln.According to the implementation of the above scheme, in the case where the combustion air metering of coal gas and coal powder mixed combustion furnace kiln is missing or inaccurate, the combustion air quantity L n s Can be calculated by the consumption of coal gas, the consumption of coal powder, the composition data of coal gas and coal powder, the composition data in flue gas, the characteristic data of fly ash and the like, and then the theoretical combustion air quantity L o S Is calculated, so that the combustion air quantity L n s Theoretical combustion air quantity L o S Is calculated, so that the air excess coefficient is accurately calculated.For coal gas and coal powder mixed combustion furnace kiln heat balance test provides original test data to calculate the combustion air quantity and air excess coefficient, which can provide strong basic data support for coal gas and coal powder mixed combustion furnace kiln heat balance test.

Description

Technical Field

[0001] This invention belongs to the field of heat balance testing technology for metallurgical gas-fired furnaces and kilns, and particularly relates to the calculation method of combustion air volume and excess air coefficient in gas-pulverized coal co-firing furnaces and kilns. Background Technology

[0002] The steelmaking process generates a large amount of blast furnace gas. How to effectively utilize this byproduct is a common concern among technical personnel. In recent years, pulverized coal boilers that co-fire blast furnace gas have been successfully applied and gradually promoted in some steel plants. Furthermore, not only pulverized coal boilers but also gas-coal co-firing furnaces (also known as gas-pulverized coal co-firing furnaces) that use both blast furnace gas and pulverized coal are increasingly being used. Gas-coal co-firing furnaces effectively reduce the blast furnace gas emission rate. From the perspective of steel plants, co-firing blast furnace gas allows for better utilization of blast furnace gas and helps achieve a balance in the gas pipeline network. In addition, after pulverized coal is co-fired with blast furnace gas, SO2 and NOx emissions are significantly reduced. x The emissions of dust and particulate matter are significantly reduced compared to traditional pulverized coal boilers.

[0003] Energy conservation and carbon reduction are ongoing technical problems and goals in steelmaking and its subsequent processing and utilization. Furnace heat balance testing is a scientific method for analyzing the energy distribution and utilization level of heating furnaces. It is a crucial foundation for improving energy efficiency, optimizing energy management systems, and reducing energy consumption, and serves as a scientific basis for formulating energy-saving and consumption-reducing measures.

[0004] Combustion air volume and excess air system are crucial thermal parameters for furnace heat balance testing and combustion regulation. In the metallurgical industry, gas-coal co-firing furnaces using both coal gas and pulverized coal typically have a certain excess of combustion air for combustion control. Generally, there is no incomplete combustion chemical heat loss after the combustion of coal gas and pulverized coal, meaning the flue gas does not contain combustible substances such as carbon monoxide and hydrocarbons. However, in many cases, gas-coal co-firing furnaces lack accurate or metered combustion air volume measurements, making it impossible to determine the combustion air volume and excess air coefficient. This hinders proper furnace heat balance testing and air-to-coal ratio adjustment.

[0005] In summary, for gas-pulverized coal co-firing furnaces where there is a lack of or inaccurate measurement of combustion air volume, there is an urgent need for a method to calculate the combustion air volume and excess air coefficient of the gas-pulverized coal co-firing furnace. Summary of the Invention

[0006] Therefore, to effectively address the problem of not being able to obtain the combustion air volume and excess air coefficient in gas-pulverized coal co-firing furnaces when there is a lack of or inaccurate measurement of the combustion air volume, a method for calculating the combustion air volume and excess air coefficient of gas-pulverized coal co-firing furnaces is provided. This lays the foundation for heat balance calculation and fuel combustion regulation in gas-pulverized coal co-firing furnaces and provides necessary reference data for energy-saving measures in these furnaces.

[0007] To achieve the above objectives, the following technical solution is adopted:

[0008] This invention provides a method for calculating the amount of combustion air in a coal gas-pulverized coal co-firing furnace, comprising the following steps:

[0009] During the testing of the gas-coal pulverized coal co-firing furnace, the moisture content in the dry air, the consumption of gas, and the consumption of pulverized coal were collected; gas and pulverized coal were sampled and analyzed during the testing of the gas-coal pulverized coal co-firing furnace to obtain compositional data of gas and pulverized coal; and characteristic data of slag generated during the testing of the gas-coal pulverized coal co-firing furnace were obtained.

[0010] Collect data on the composition of flue gas and the characteristics of fly ash during the testing of the gas-pulverized coal co-firing furnace.

[0011] The first calculation formula is used to integrate the consumption of coal gas, the consumption of pulverized coal, the composition data of coal gas, the characteristic data of coal slag, the composition data of flue gas, and the characteristic data of fly ash to obtain the flue gas volume data.

[0012] Based on the composition data of coal gas, coal powder, flue gas, and flue gas volume, the amount of dry air required for combustion is calculated using the second calculation formula.

[0013] The amount of combustion air required for combustion is calculated using the third formula based on the amount of dry air required for combustion and the moisture content in the dry air.

[0014] The characteristic data of coal slag includes the amount of coal slag generated and the carbon content of the coal slag obtained by sampling and analysis; the characteristic data of fly ash includes the amount of fly ash generated and the carbon content in the fly ash.

[0015] Furthermore, the composition data of the gas is the wet composition data of the gas, including the content of carbon monoxide, hydrogen, methane, hydrocarbons, hydrogen sulfide, carbon dioxide, oxygen, nitrogen and water.

[0016] The composition data of pulverized coal includes carbon content, hydrogen content, oxygen content, nitrogen content, sulfur content, moisture content, and ash content.

[0017] Furthermore, the composition data of the flue gas is the wet composition data of the flue gas, including the content of carbon monoxide, carbon dioxide, oxygen, nitrogen and water.

[0018] Furthermore, the first calculation formula is characterized as follows:

[0019]

[0020] V y Flue gas volume, unit: m³ 3 / h;

[0021] B g This represents the consumption of coal gas, expressed in cubic meters (m³). 3 / h, B s This represents the consumption of pulverized coal, expressed in kg / h.

[0022] CO g s CH 4g s C n H mg s CO 2g s These represent the content of carbon monoxide, methane, hydrocarbons, and carbon dioxide in the wet components of coal gas, in % (%).

[0023] C ar The carbon content of pulverized coal, expressed as a percentage.

[0024] CO 2y s The content of carbon dioxide in the wet component of flue gas, expressed as a percentage.

[0025] M represents the amount of coal slag generated, in kg / h.

[0026] F represents the fly ash generation rate, in kg / h.

[0027] C M The carbon content of coal slag, expressed as a percentage.

[0028] C F The carbon content of fly ash, expressed as a percentage.

[0029] Furthermore, the second calculation formula is:

[0030]

[0031] L n Dry air volume, unit: m 3 / h;

[0032] V y Flue gas volume, unit: m³ 3 / h;

[0033] N 2y sThe nitrogen content in the wet component of flue gas, expressed as a percentage.

[0034] N 2g s The nitrogen content in the wet composition of coal gas, expressed as a percentage.

[0035] N ar Nitrogen content in pulverized coal, in %;

[0036] B g This represents the consumption of coal gas, expressed in cubic meters (m³). 3 / h;

[0037] B s This represents the consumption of pulverized coal, expressed in kg / h.

[0038] Furthermore, the third calculation formula is:

[0039] L s n =L n +0.00124g×L n

[0040] L n s The volume of combustion air is expressed in meters (m). 3 / h;

[0041] L n Dry air volume, unit: m 3 / h;

[0042] g represents the moisture content in dry air, measured in g / m³. 3 .

[0043] This invention provides a method for calculating the excess air coefficient in a coal gas and pulverized coal co-firing furnace, comprising the following steps:

[0044] The composition data of coal gas, the composition data of coal powder, the consumption of coal gas, and the consumption of coal powder were obtained using the calculation method described above.

[0045] The fourth calculation formula is used to integrate the consumption of coal gas, the consumption of pulverized coal, the composition data of coal gas, and the composition data of pulverized coal to obtain the theoretical dry air volume.

[0046] Based on the theoretical dry air volume and the moisture content of the dry air, the theoretical combustion air volume required for combustion is calculated using the fifth calculation formula.

[0047] Based on the theoretical combustion air volume and the combustion air volume obtained using the calculation method described above, the excess air coefficient is obtained using the sixth calculation formula.

[0048] Furthermore, the fourth calculation formula is:

[0049]

[0050] L o Theoretical dry air volume, unit: m³ 3 / h;

[0051] B g This represents the consumption of coal gas, expressed in cubic meters (m³). 3 / h;B s This represents the consumption of pulverized coal, expressed in kg / h.

[0052] CO g s H 2g s C n H mg s H2S g s O 2g s These represent the content of carbon monoxide, hydrogen, hydrocarbons, hydrogen sulfide, and oxygen in the wet components of coal gas, in percentage (%).

[0053] C ar H ar S ar O ar The carbon, hydrogen, sulfur, and oxygen content of pulverized coal are expressed as a percentage (%).

[0054] Furthermore, the fifth calculation formula is:

[0055]

[0056] L o S Theoretical combustion air volume, unit: m³ 3 / h;

[0057] L o Theoretical dry air volume, unit: m³ 3 / h;

[0058] g represents the moisture content in dry air, measured in g / m³. 3 .

[0059] Furthermore, the sixth calculation formula is:

[0060]

[0061] α is the excess air coefficient;

[0062] L o S Theoretical combustion air volume, unit: m³ 3 / h;

[0063] L n s The volume of combustion air is expressed in meters (m). 3 / h.

[0064] The present invention has the following beneficial technical effects:

[0065] The method for calculating the amount of combustion air and the excess air coefficient in a gas-pulverized coal co-firing furnace of the present invention can calculate the amount of combustion air and the excess air coefficient in the case of missing or inaccurate metering of combustion air in a gas-pulverized coal co-firing furnace. This can provide strong basic data support for the heat balance test of a gas-pulverized coal co-firing furnace.

[0066] After implementing the above scheme, the combustion air volume L can be calculated using the third formula. n s The theoretical combustion air quantity L is calculated using the fifth formula. o S Therefore, the combustion air volume L is adopted. n s and theoretical combustion air volume L o S This allows for the accurate calculation of the excess air coefficient, providing raw test data for the heat balance testing of gas-pulverized coal co-firing furnaces. Attached Figure Description

[0067] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0068] Figure 1 This is a flowchart illustrating the method for determining the amount of combustion air and the excess air coefficient in a coal gas-pulverized coal co-firing furnace according to an embodiment of the present invention. Detailed Implementation

[0069] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to specific examples and the accompanying drawings.

[0070] The present invention relates to a method for determining the amount of combustion air and the excess air coefficient in a gas-pulverized coal co-firing furnace that uses both gas and pulverized coal as fuels, under conditions where there is no incomplete chemical heat loss (i.e., no combustible substances such as carbon monoxide and hydrocarbons in the flue gas) and where the amount of combustion air and flue gas is unmeasured or inaccurate.

[0071] This invention involves taking flue gas composition through flue openings when there is no or no metering of combustion air and flue gas volume, using carbon dioxide balance and back-calculation of flue gas volume, and then using nitrogen balance to calculate combustion air volume.

[0072] The present invention can determine the amount of combustion air and the excess air coefficient by following the steps below.

[0073] like Figure 1 As shown, the calculation method of the present invention first calculates the amount of combustion air in the gas-pulverized coal co-firing furnace, and then calculates the excess air coefficient based on the amount of combustion air and the previously collected data.

[0074] Specifically, the following steps are included:

[0075] During the testing of the gas-coal pulverized coal co-firing furnace, the moisture content in the dry air, the consumption of gas, and the consumption of pulverized coal were collected; gas and pulverized coal were sampled and analyzed during the testing of the gas-coal pulverized coal co-firing furnace to obtain compositional data of gas and pulverized coal; and characteristic data of slag generated during the testing of the gas-coal pulverized coal co-firing furnace were obtained.

[0076] Collect data on the composition of flue gas and the characteristics of fly ash during the testing of the gas-pulverized coal co-firing furnace.

[0077] The first calculation formula is used to integrate the consumption of coal gas, the consumption of pulverized coal, the composition data of coal gas, the characteristic data of coal slag, the composition data of flue gas, and the characteristic data of fly ash to obtain the flue gas volume data.

[0078] Based on the composition data of coal gas, coal powder, flue gas, and flue gas volume, the amount of dry air required for combustion is calculated using the second calculation formula.

[0079] The amount of combustion air required for combustion is calculated using the third formula based on the amount of dry air required for combustion and the moisture content in the dry air.

[0080] Using the gas composition data, pulverized coal composition data, gas consumption, and pulverized coal consumption data obtained above, the fourth calculation formula is used to integrate the gas consumption, pulverized coal consumption, gas composition data, and pulverized coal composition data to obtain the theoretical dry air volume.

[0081] Based on the theoretical dry air volume and the moisture content of the dry air, the theoretical combustion air volume required for combustion is calculated using the fifth calculation formula.

[0082] Based on the theoretical combustion air volume and the combustion air volume obtained using the calculation method described above, the excess air coefficient is obtained using the sixth calculation formula.

[0083] The characteristic data of coal slag includes the amount of coal slag generated and the carbon content of the coal slag obtained from sampling and analysis; the characteristic data of fly ash includes the amount of fly ash generated and the carbon content in the fly ash.

[0084] The composition data of the coal gas is the wet composition data of the coal gas, including the content of carbon monoxide, hydrogen, methane, hydrocarbons, hydrogen sulfide, carbon dioxide, oxygen, nitrogen and water.

[0085] The composition data of pulverized coal includes carbon content, hydrogen content, oxygen content, nitrogen content, sulfur content, moisture content, and ash content.

[0086] The composition data of the flue gas is the wet composition data of the flue gas, including the content of carbon monoxide, carbon dioxide, oxygen, nitrogen and water.

[0087] Based on the balance of CO and CO2 before and after combustion, the flue gas volume V is determined according to the first calculation formula below. y :

[0088]

[0089] V y Flue gas volume, unit: m³ 3 / h;

[0090] B g This represents the consumption of coal gas, expressed in cubic meters (m³). 3 / h, B s This represents the consumption of pulverized coal, expressed in kg / h.

[0091] CO g s CH 4g s C n H mg s CO 2g s These represent the content of carbon monoxide, methane, hydrocarbons, and carbon dioxide in the wet components of coal gas, in % (%).

[0092] C ar The carbon content of pulverized coal, expressed as a percentage.

[0093] CO 2y s The content of carbon dioxide in the wet component of flue gas, expressed as a percentage.

[0094] M represents the amount of coal slag generated, in kg / h.

[0095] F represents the fly ash generation rate, in kg / h.

[0096] C MThe carbon content of coal slag, expressed as a percentage.

[0097] C F The carbon content of fly ash, expressed as a percentage.

[0098] Based on the balance of N (nitrogen content) before and after combustion, the dry air volume L is determined according to the second calculation formula below. n :

[0099]

[0100] L n Dry air volume, unit: m 3 / h;

[0101] V y Flue gas volume, unit: m³ 3 / h;

[0102] N 2y s The nitrogen content in the wet component of flue gas, expressed as a percentage.

[0103] N 2g s The nitrogen content in the wet composition of coal gas, expressed as a percentage.

[0104] N ar Nitrogen content in pulverized coal, in %;

[0105] B g This represents the consumption of coal gas, expressed in cubic meters (m³). 3 / h;

[0106] B s This represents the consumption of pulverized coal, expressed in kg / h.

[0107] Calculate the combustion air volume L according to the third calculation formula below. n s :

[0108]

[0109] L n s The volume of combustion air is expressed in meters (m). 3 / h;

[0110] L n Dry air volume, unit: m 3 / h;

[0111] g represents the moisture content in dry air, measured in g / m³. 3 .

[0112] Calculate the theoretical dry air volume L using the fourth calculation formula below. o :

[0113]

[0114] L o Theoretical dry air volume, unit: m³ 3 / h;

[0115] B g This represents the consumption of coal gas, expressed in cubic meters (m³). 3 / h;B s This represents the consumption of pulverized coal, expressed in kg / h.

[0116] CO g s H 2g s C n H mg s H2S g s O 2g s These represent the content of carbon monoxide, hydrogen, hydrocarbons, hydrogen sulfide, and oxygen in the wet components of coal gas, in percentage (%).

[0117] C ar H ar S ar O ar The carbon, hydrogen, sulfur, and oxygen content of pulverized coal are expressed as a percentage (%).

[0118] The theoretical combustion air volume L is calculated using the fifth calculation formula below. o S :

[0119]

[0120] L o S Theoretical combustion air volume, unit: m³ 3 / h;

[0121] L o Theoretical dry air volume, unit: m³ 3 / h;

[0122] g represents the moisture content in dry air, measured in g / m³. 3 .

[0123] Calculate the excess air coefficient α according to the sixth formula below:

[0124]

[0125] α is the excess air coefficient;

[0126] Lo S Theoretical combustion air volume, unit: m³ 3 / h;

[0127] L n s The volume of combustion air is expressed in meters (m). 3 / h.

[0128] The method for calculating the amount of combustion air and the excess air coefficient in a gas-pulverized coal co-firing furnace of the present invention can calculate the amount of combustion air and the excess air coefficient in the case of missing or inaccurate metering of combustion air in a gas-pulverized coal co-firing furnace. This can provide strong basic data support for the heat balance test of a gas-pulverized coal co-firing furnace.

[0129] After implementing the above scheme, the combustion air volume L can be calculated using the third formula. n s The theoretical combustion air quantity L is calculated using the fifth formula. o S Therefore, the combustion air volume L is adopted. n s and theoretical combustion air volume L o S This allows for the accurate calculation of the excess air coefficient, providing raw test data for the heat balance testing of gas-pulverized coal co-firing furnaces.

[0130] To more clearly illustrate the essence of the technical solution of this invention, based on the above embodiments, specific embodiments supported by data are proposed to present the overall picture of the technical solution of this invention. It should be noted that the specific embodiments are merely intended to further demonstrate the technical essence of this invention and are not intended to limit the scope of protection of this invention. Any combined technical solution that satisfies the essence of the technical solution of this invention, obtained by those skilled in the art based on the various embodiments of this invention and by combining technical features, is within the scope of protection of this patent, as long as it can be practically implemented.

[0131] Example 1

[0132] Gas consumption B during the testing of the gas-coal co-firing furnace g = 3800 m³ / h; Pulverized coal consumption B s =570kg / h; slag production M = 70kg / h, carbon content C in slag M The carbon content is 1%; the fly ash generation rate F is 7 kg / h, and the carbon content C in the fly ash is... M The moisture content in the air is 1%, and the moisture content in the air is 8.4 g / m³. The composition of the received basis of coal gas, flue gas after flue gas venting, and pulverized coal is shown in Table 1-3 below.

[0133] Table 1. Composition of Coal Gas (Wet Composition)

[0134]

[0135] Table 2. Flue Gas Composition Table (Wet Components of Flue Gas)

[0136] Smoke composition <![CDATA[CO2]]> <![CDATA[O2]]> <![CDATA[N2]]> <![CDATA[H2O]]> content% 21.00 3.12 72.04 3.84

[0137] Table 3 Composition of Pulverized Coal

[0138] Coal powder composition C H O N S Ash Moisture content% 74.545 2.000 2.885 1.600 3.800 12.350 1.820

[0139] The result obtained by the above calculation method according to the present invention is: flue gas volume V y 12841m 3 / h, combustion air volume (L) n s The air volume is 9501 m3 / h, and the excess air coefficient α is 1.248.

[0140] Example 2

[0141] The gas consumption during the testing of the gas-coal co-firing furnace was B. g =4200m 3 / h; the consumption of pulverized coal is B s =430kg / h; slag production M = 68kg / h, carbon content C in slag M The carbon content is 0.7%; the fly ash generation rate F is 4.7 kg / h, and the carbon content C in the fly ash is... M The concentration is 0.1%, and the moisture content in the air is g = 9.6 g / m³. 3 The composition of the received basis of coal gas, flue gas after flue gas duct opening, and pulverized coal is shown in Table 4-6 below.

[0142] Table 4 Composition of Coal Gas

[0143]

[0144] Table 5. Smoke Gas Composition Table

[0145] Smoke composition <![CDATA[CO2]]> <![CDATA[O2]]> <![CDATA[N2]]> <![CDATA[H2O]]> content% 18.23 6.32 73.51 1.94

[0146] Table 6 Composition of Pulverized Coal

[0147] Coal powder composition C H O N S Ash Moisture content% 73.542 2.453 2.426 1.73 2.313 15.803 1.733

[0148] The result obtained by the above calculation method according to the present invention is: flue gas volume V y 15593m 3 / h, combustion air volume (L) n s The air volume is 15523 m3 / h, and the excess air coefficient α is 1.704.

[0149] In the calculation methods of this invention and its embodiments, the percentage percentages (%) in the composition data of coal gas and flue gas are volume percentages. The composition data of pulverized coal in the calculation methods of this invention and its embodiments are obtained using elemental analysis methods for coal.

[0150] The above are exemplary embodiments disclosed in this invention. However, it should be noted that various changes and modifications can be made without departing from the scope of the embodiments of this invention as defined by the claims. Although the elements disclosed in the embodiments of this invention may be described or claimed individually, they may be understood as multiple unless explicitly limited to a singular number.

[0151] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples. Within the framework of the invention, technical features of the above embodiments or different embodiments can be combined, and many other variations of different aspects of the invention exist, which are not provided in the details for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the protection scope of the invention.

Claims

1. A method for calculating the amount of combustion air in a gas-pulverized coal co-firing furnace, characterized in that, Includes the following steps: During the testing of the gas-coal pulverized coal co-firing furnace, the moisture content in the dry air, the consumption of gas, and the consumption of pulverized coal were collected; gas and pulverized coal were sampled and analyzed during the testing of the gas-coal pulverized coal co-firing furnace to obtain compositional data of gas and pulverized coal; and characteristic data of slag generated during the testing of the gas-coal pulverized coal co-firing furnace were obtained. Collect data on the composition of flue gas and the characteristics of fly ash during the testing of the gas-pulverized coal co-firing furnace. The first calculation formula is used to integrate the consumption of coal gas, the consumption of pulverized coal, the composition data of coal gas, the characteristic data of coal slag, the composition data of flue gas, and the characteristic data of fly ash to obtain the flue gas volume data. Based on the composition data of coal gas, coal powder, flue gas, and flue gas volume, the amount of dry air required for combustion is calculated using the second calculation formula. The amount of combustion air required for combustion is calculated using the third formula based on the amount of dry air required for combustion and the moisture content in the dry air. The characteristic data of coal slag includes the amount of coal slag generated and the carbon content of the coal slag obtained from sampling and analysis; the characteristic data of fly ash includes the amount of fly ash generated and the carbon content in the fly ash. The first calculation formula is: V y Flue gas volume, unit: m³ 3 / h;B g This represents the consumption of coal gas, expressed in cubic meters (m³). 3 / h, B s The consumption of pulverized coal is expressed in kg / h; CO g s CH 4g s C n H mg s CO 2g s The values ​​represent the content of carbon monoxide, methane, hydrocarbons, and carbon dioxide in the wet components of coal gas, in percentages (%). ar The carbon content of pulverized coal, in %; CO 2y s The percentage of carbon dioxide in the wet composition of flue gas is %; M is the amount of slag generated, in kg / h; F is the amount of fly ash generated, in kg / h; C M The carbon content of coal slag, in %; C F The carbon content of fly ash, expressed as % . The second calculation formula is: L n Dry air volume, unit: m 3 / h;V y Flue gas volume, unit: m³ 3 / h;N 2y s The nitrogen content in the wet composition of flue gas, expressed as % (N). 2g s The nitrogen content in the wet composition of coal gas, expressed as % (N). ar Nitrogen content in pulverized coal, in %; B g This represents the consumption of coal gas, expressed in cubic meters (m³). 3 / h;B s This represents the consumption of pulverized coal, expressed in kg / h. The third calculation formula is: L n s The volume of combustion air is expressed in meters (m). 3 / h;L n Dry air volume, unit: m 3 / h; g represents the moisture content in dry air, in g / m³. 3 .

2. The method for calculating the amount of combustion air in a gas-pulverized coal co-firing furnace as described in claim 1, characterized in that, The composition data of the coal gas is the wet composition data of the coal gas, including the content of carbon monoxide, hydrogen, methane, hydrocarbons, hydrogen sulfide, carbon dioxide, oxygen, nitrogen and water. The composition data of pulverized coal includes carbon content, hydrogen content, oxygen content, nitrogen content, sulfur content, moisture content, and ash content.

3. The method for calculating the amount of combustion air in a gas-pulverized coal co-firing furnace as described in claim 2, characterized in that, The composition data of the flue gas is the wet composition data of the flue gas, including the content of carbon monoxide, carbon dioxide, oxygen, nitrogen and water.

4. A method for calculating the excess air coefficient in a gas-pulverized coal co-firing furnace, characterized in that, Includes the following steps: The composition data of coal gas, the composition data of coal powder, the consumption of coal gas, and the consumption of coal powder are obtained by the calculation method described in any one of claims 1-3. The fourth calculation formula is used to integrate the consumption of coal gas, the consumption of pulverized coal, the composition data of coal gas, and the composition data of pulverized coal to obtain the theoretical dry air volume. Based on the theoretical dry air volume and the moisture content of the dry air, the theoretical combustion air volume required for combustion is calculated using the fifth calculation formula. The excess air coefficient is obtained using the sixth formula based on the theoretical combustion air volume and the combustion air volume obtained by the calculation method described in any one of claims 1-3.

5. The method for calculating the excess air coefficient of a gas-pulverized coal co-firing furnace as described in claim 4, characterized in that, The fourth calculation formula is: L o Theoretical dry air volume, unit: m³ 3 / h; B g This represents the consumption of coal gas, expressed in cubic meters (m³). 3 / h;B s This represents the consumption of pulverized coal, expressed in kg / h. CO g s H 2g s C n H mg s H2S g s O 2g s These represent the content of carbon monoxide, hydrogen, hydrocarbons, hydrogen sulfide, and oxygen in the wet composition of coal gas, in percentages (%). C ar H ar S ar O ar The carbon, hydrogen, sulfur, and oxygen content of pulverized coal, in units.

6. The method for calculating the excess air coefficient of a gas-pulverized coal co-firing furnace as described in claim 4, characterized in that, The fifth calculation formula is: L o S Theoretical combustion air volume, unit: m³ 3 / h; L o Theoretical dry air volume, unit: m³ 3 / h; g represents the moisture content in dry air, measured in g / m³. 3 .

7. The method for calculating the excess air coefficient of a gas-pulverized coal co-firing furnace as described in claim 4, characterized in that, The sixth calculation formula is: The excess air coefficient; L o S Theoretical combustion air volume, unit: m³ 3 / h; L n s The volume of combustion air is expressed in meters (m). 3 / h.

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