Method for optimizing the operation of a gasifier

Abstract

The application discloses a method for optimizing the operation performance of a gasifier, comprising the following steps: S1, establishing a theoretical model for analyzing the operation performance of the gasifier, at least comprising: S101, determining model variables; S102, determining reaction rates; S103, determining the carbon conversion rate of the gasifier; S2, collecting operation parameters of the gasifier within a certain period of time, wherein the operation parameters are input and output parameters of the gasifier and parameters of various operation states; S3, fitting parameters a1, a2, a3, a4, a5 and a6 according to the collected operation parameters, so as to complete the establishment of the theoretical model. The application combines the theoretical analysis of coal gasification with the actual operation condition, fully combines the theoretical calculation advantages of thermodynamic analysis and kinetic analysis, simultaneously introduces the field data to check and correct the error of the theoretical calculation, can reflect the real operation state of the gasifier, and forms a kind of optimization method for the operation performance of the gasifier.

Description

Technical Field

[0001] This application relates to the field of coal gasification furnaces, and in particular to a method for optimizing the operating performance of a gasification furnace. Background Technology

[0002] Coal is an important energy source in my country and a raw material for the production of many chemicals. The clean and efficient utilization of coal aligns with the current trend of energy conservation and environmental protection, thus becoming one of the key research directions in China. High-temperature and high-pressure coal gasification is a process that converts solid fossil fuel coal into gaseous combustibles under high temperature and pressure. The process involves using gas or water as a fluidizing agent to carry coal into the gasifier reaction chamber. The coal comes into contact with oxygen and undergoes a series of complex physicochemical reactions, generating crude syngas mainly composed of hydrogen, carbon monoxide, carbon dioxide, and water vapor, as well as unburned ash.

[0003] The crude syngas is cooled and purified before being used as a product. The ash residue is cooled, collected, and periodically discharged and cleaned up after leaving the reaction chamber. High-temperature and high-pressure coal gasification technology has been widely promoted and applied due to its advantages of fast reaction speed, high energy utilization rate, and low environmental pollution.

[0004] However, due to the complexity of coal gasification systems, the large fluctuations in coal quality, varying reactivity, high temperatures and pressures, and limited measurement data, maintaining the gasifier equipment in a consistently optimal operating condition remains a challenge for the industry. Therefore, a method to address this challenge is needed. Summary of the Invention

[0005] To address the aforementioned technical problems, the purpose of this application is to provide a method for optimizing the operating performance of a gasifier, comprising the following steps: S1. Establish a theoretical model for the operational performance analysis of the gasifier, including at least: S101. Determining Model Variables: The raw material is pulverized coal, and N2 or CO2 is used as the fluidizing gas to transport the pulverized coal at a flow rate of V. N2 or V CO2 The raw material reacts with O2 at operating pressure P and operating temperature T; The formula for calculating the operating temperature T is:

[0006] in, Let n be the enthalpy of substance i at the gasifier inlet at temperature T. i Where i is the number of moles of the inlet substance, and Q is the heat output of the gasifier; The composition of the raw materials is expressed as the mass fractions of C, H, O, N, S, ash, and H2O. The ash content is expressed as the mass fractions of SiO2, Al2O3, Fe2O3, MgO, CaO, Na2O, K2O, TiO2, SO3, and P2O5. The energy of the raw materials is expressed as their calorific value. The crude syngas is generated, and the crude syngas components include CO, CO2, H2, H2O, CH4, N2, NH3, HCN, H2S and COS; The formula for calculating the mass of the raw materials in the gasifier is as follows:

[0007] Where, N * n represents the amount of each element at the gasifier inlet. X* For gasifier outlet containing element X * Amount of components; S102. Determination of reaction rate: The main chemical reactions occurring in the gasifier are C + O₂ = CO₂, C + 1 / 2 O₂ = CO, C + CO₂ = 2CO, and C + H₂O = CO + H₂. The formulas for calculating their reaction rates are as follows:

[0008] Among them, R * k is the reaction rate. * Let a be the reaction rate constant. * n is the correction factor between the laboratory test value and the actual value during gasifier operation. * For the reaction process or gasifier outlet * Amount of components; Other reactions occurring in the gasifier include COS + H2 = H2S + CO and N2 + 3H2 = 2NH3, with the following equilibrium constants:

[0009] Among them, K * p is the equilibrium constant for the reaction. i p j , where are the partial pressures of the reactants and products in the reaction equation, and x and y are the stoichiometric coefficients of the reactants and products in the reaction equation, respectively. Other reactions occurring inside the gasifier include CO + 3H₂ = CH₄ + H₂O, CO₂ + 4H₂ = CH₄ + 2H₂O, and nCO + (2n+1)H₂ = C n H 2n+2 +nH2O、nCO2+(4n+1)H2=C n H 2n+2 +2nH2O, etc., where the CH4 concentration and the operating temperature T satisfy the relationship nCH4 =a5exp(a6 / T), C n H 2n+2 The content of these substances is so small as to be negligible. S103. Determination of carbon conversion rate in gasifier: The formula for calculating the conversion rate of element C is (carbon content of crude syngas at the outlet - carbon content of carbon dioxide at the inlet) / carbon content in the inlet coal; S2. Collect the operating parameters of the gasifier over a certain period of time, wherein the operating parameters are the gasifier's input and output parameters and parameters of various operating states; S3. Based on the collected operating parameters, fit parameters a1, a2, a3, a4, a5, and a6 to complete the establishment of the theoretical model. S4. Based on the collected gasifier input parameters, calculate the gasifier output parameters using the theoretical model; S5. Calculate the difference between the output parameters of the theoretical model and the actual output parameters of the gasifier using the theoretical model; S6. When the difference meets the error range, the output parameters of the gasifier after modifying the coal quantity and oxygen quantity are calculated using the theoretical model. The excellent performance of the gasifier is judged by the evaluation criteria, thereby monitoring and adjusting the working status of the coal gasifier.

[0010] As an optional embodiment, the formula for calculating the mass of the raw materials in the gasifier is as follows: N c =n CO +n CO2 +n COS +n CH4 +n HCN N H =2n H2 +2n H2O +4n CH4 +3n NH3 +n HCN +2n H2S N O =n CO +2n CO2 +n H2O +n COS N N =2n N2 +n NH3 +n HCN N S =n H2S +n COS Where, N *n represents the amount of element* at the gasifier inlet. * The number of moles of the exported material*.

[0011] As an optional embodiment, the formula for calculating the reaction rate is as follows: R1=a1*k1*n C *n O2 R2 = a2 * k2 * n C *[n O2 ] 0.5 R3 = a3 * k3 * n C *n CO2 R4 = a4 * k4 * n C *n H2O Among them, R * k is the reaction rate. * n is the reaction rate constant. * a represents the molar amount of each component during the reaction process or at the gasifier outlet. * This is a correction factor between laboratory test values ​​and actual values ​​during gasifier operation.

[0012] As an optional embodiment, the formula for calculating the reaction equilibrium constant is as follows: K1=P H2 *P COS / (P H2S *P CO ) K2=P N2 *[P H2 ] 3 / [P NH3 ] 2 Among them, K i P is the equilibrium constant for reaction i. * This is the partial pressure of the substance*.

[0013] As an optional embodiment, the input parameters of the gasifier include coal quantity, coal composition, coal ash composition analysis, coal calorific value, oxygen content, steam flow rate, nitrogen or carbon dioxide flow rate, operating pressure, and operating temperature. The theoretical model calculates the output parameters of the gasifier, including crude syngas production, crude syngas composition, carbon conversion rate, heat generation of the gasifier, and reaction temperature of the gasifier.

[0014] As an optional embodiment, the error range is ±0.1%.

[0015] As an optional embodiment, the reaction rate constant can be obtained in at least one of the following ways: Obtained by analyzing the chemical reactivity of coal using the national standard method; Obtained by thermogravimetric analysis of the chemical reactivity of coal; This information was obtained by analyzing the chemical reactivity of coal using a drip furnace.

[0016] As an optional embodiment, the fitting parameters a1, a2, a3, a4, a5, and a6 include at least one of the following: The output parameters of the gasifier are calculated using numerical methods. The output parameters of the gasifier are calculated using a multi-point numerical fitting method. The output parameters of the gasifier are calculated using an artificial neural network algorithm.

[0017] As an optional embodiment, the method of calculating the gasifier output parameters using an artificial neural network algorithm includes: Based on the gasifier's input and output parameters, and combined with the theoretical model, the fitting parameters are obtained using an artificial neural network algorithm.

[0018] As an optional embodiment, the evaluation criteria include at least one of the following: The profit per ton of coal is the highest; The coal consumption per unit of effective gas production is the lowest; It has the highest carbon conversion rate; The effective gas production is the highest.

[0019] The beneficial effects of the embodiments of this application are as follows: This invention proposes a method that combines theoretical analysis of coal gasification with actual field operation, fully leveraging the advantages of thermodynamic and kinetic analysis in theoretical calculations. It also incorporates field data to verify and correct errors in theoretical calculations, thus reflecting the true operating state of the gasifier and forming a method for optimizing gasifier performance. This method effectively estimates various parameters of gasifier operation, guiding operations to control gasifier performance. It is beneficial for improving the efficient and clean utilization of coal, reducing product consumption, and enhancing market competitiveness.

[0020] This invention can effectively improve the situation where the performance of the gasifier is complex, operators need rich on-site operating experience, and it is difficult to obtain the optimal operating conditions or require long-term and costly trial operation. It provides strong support for the efficient and stable operation of the gasifier, and at the same time has the advantages of energy saving, emission reduction, cost reduction and efficiency improvement. Attached Figure Description

[0021] Figure 1 This is a flowchart illustrating a method for optimizing the operating performance of a gasifier according to an embodiment of this application. Figure 2A flowchart illustrating the theoretical model for analyzing the operational performance of a gasifier, as described in this application embodiment; Figure 3 A diagram illustrating the BP neural network model for solving the fitting parameters in an embodiment of this application; Figure 4 This is a diagram illustrating the optimization process in an embodiment of this application. Detailed Implementation

[0022] Various embodiments and features of this application are described herein with reference to the accompanying drawings.

[0023] It should be understood that various modifications can be made to the embodiments described herein. Therefore, the above description should not be considered as limiting, but merely as an example of embodiments. Other modifications within the scope and spirit of this application will be apparent to those skilled in the art.

[0024] The accompanying drawings, which are included in and form part of this specification, illustrate embodiments of the present application and, together with the general description of the present application given above and the detailed description of the embodiments given below, serve to explain the principles of the present application.

[0025] These and other features of this application will become apparent from the following description of preferred forms of embodiments given as non-limiting examples, with reference to the accompanying drawings.

[0026] It should also be understood that although this application has been described with reference to some specific examples, those skilled in the art can certainly implement many other equivalent forms of this application.

[0027] The above and other aspects, features and advantages of this application will become more apparent when taken in conjunction with the accompanying drawings and in view of the following detailed description.

[0028] Specific embodiments of this application are described thereafter with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of this application, which can be implemented in various ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that could obscure the application. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely serve as the basis and representative basis for the claims to teach those skilled in the art to use this application in a variety of substantially any suitable detailed structures.

[0029] This specification may use the phrases “in one embodiment,” “in another embodiment,” “in yet another embodiment,” or “in other embodiments,” all of which may refer to one or more of the same or different embodiments according to this application.

[0030] The purpose of this application is to provide a method for optimizing the operating performance of a gasifier, such as... Figure 1 and Figure 2 As shown, the method for optimizing the operating performance of the gasifier includes the following steps: S1. Establish a theoretical model for the performance analysis of the gasifier, wherein the theoretical model satisfies the laws of mass and energy conservation, and the thermodynamics and kinetics of chemical reactions, and includes several model parameters; the theoretical model includes at least: S101. Determining Model Variables: The raw material is pulverized coal, and N2 or CO2 is used as the fluidizing gas to transport the pulverized coal at a flow rate of V. N2 or V CO2 The raw material reacts with O2 at operating pressure P and operating temperature T; According to the law of conservation of energy, the energy of the inlet material = the energy of the outlet material + the heat generated by the gasifier. The formula for calculating the operating temperature T is:

[0031] in, Let n be the enthalpy of substance i at the gasifier inlet at temperature T. i Where i is the number of moles of the inlet substance, and Q is the heat output of the gasifier; The composition of the raw materials is expressed as the mass fractions of C, H, O, N, S, ash, and H2O. The ash content is expressed as the mass fractions of SiO2, Al2O3, Fe2O3, MgO, CaO, Na2O, K2O, TiO2, SO3, and P2O5. The energy of the raw materials is expressed as their calorific value. The crude syngas is generated, and its components include CO, CO2, H2, H2O, CH4, N2, NH3, HCN, H2S, and COS. The content of the crude syngas components satisfies the law of conservation of mass, the law of kinetic reaction, and the law of thermodynamic equilibrium.

[0032] According to the law of conservation of mass, the inlet material is equal to the outlet material. Therefore, the formula for calculating the mass of the raw material in the gasifier is:

[0033] Where, N * n represents the amount of each element at the gasifier inlet. X* For gasifier outlet containing element X * Amount of components.

[0034] As an optional embodiment, the formula for calculating the mass of the raw materials in the gasifier is as follows: N c =n CO +n CO2 +n COS +n CH4 +n HCN NH =2n H2 +2n H2O +4n CH4 +3n NH3 +n HCN +2n H2S N O =n CO +2n CO2 +n H2O +n COS N N =2n N2 +n NH3 +n HCN N S =n H2S +n COS Where, N * n represents the amount of element* at the gasifier inlet. * The number of moles of the exported material*.

[0035] Specifically, the composition of coal is obtained according to national standards GB / T 211, GB / T 212, GB / T 214, GB / T 476, GB / T 31391, and GB / T 19227; the ash composition analysis of coal is obtained according to national standard GB / T 1574; and the calorific value of coal is obtained according to national standard GB / T 213. These three are collectively referred to as the characteristics of coal.

[0036] S102. Determination of reaction rate: The main chemical reactions occurring in the gasifier are C + O2 = CO2, C + 1 / 2 O2 = CO, C + CO2 = 2CO, and C + H2O = CO + H2. The reaction rates of the first two are given by the reaction rate of C with O2 in the laboratory, while the reaction rates of the latter two are given by the reaction rates of C with CO2 and C with H2O.

[0037] The formula for calculating the reaction rate of the chemical reaction is:

[0038] Among them, R * k is the reaction rate. * Let a be the reaction rate constant. * n is the correction factor between the laboratory test value and the actual value during gasifier operation. * For the reaction process or gasifier outlet * Amount of components.

[0039] As an optional embodiment, the formula for calculating the reaction rate is as follows: R1=a1*k1*nC *n O2 R2 = a2 * k2 * n C *[n O2 ] 0.5 R3 = a3 * k3 * n C *n CO2 R4 = a4 * k4 * n C *n H2O Among them, R * k is the reaction rate. * n is the reaction rate constant. * a represents the molar amount of each component during the reaction process or at the gasifier outlet. * Correction coefficients a1, a2, a3, and a4 are set to reflect the differences between laboratory test values ​​and actual values ​​during gasifier operation, reflecting the differences between laboratory operating conditions and gasifier operating conditions.

[0040] As an optional embodiment, the reaction rate constant can be obtained in at least one of the following ways: The reaction rate constant was obtained by analyzing the chemical reactivity of coal using the national standard method; The reaction rate constant was obtained by thermogravimetric analysis of the chemical reactivity of coal; The reaction rate constant was obtained by analyzing the chemical reactivity of coal using a drip furnace.

[0041] Other reactions occurring in the gasifier include COS + H2 = H2S + CO and N2 + 3H2 = 2NH3. Under ideal gas conditions, according to the second law of thermodynamics, their equilibrium constants are:

[0042] Among them, K * p is the equilibrium constant for the reaction. i p j ρ and y represent the partial pressures of the reactants and products in the reaction equation, respectively, and x and y represent the stoichiometric coefficients of the reactants and products in the reaction equation, respectively.

[0043] As an optional embodiment, the formula for calculating the reaction equilibrium constant is as follows: K1=P H2 *P COS / (P H2S *P CO ) K2=P N2 *[P H2 ] 3 / [P NH3 ] 2 Among them, K i P is the equilibrium constant for reaction i. * This is the partial pressure of the substance*.

[0044] Other reactions occurring inside the gasifier include CO + 3H₂ = CH₄ + H₂O, CO₂ + 4H₂ = CH₄ + 2H₂O, and nCO + (2n+1)H₂ = C n H 2n+2 +nH2O、nCO2+(4n+1)H2=C n H 2n+2 +2nH2O, etc., where the CH4 concentration and the operating temperature T satisfy the relationship n CH4 =a5exp(a6 / T), C n H 2n+2 The content of these substances is so small as to be negligible. S103. Determination of carbon conversion rate in gasifier: The formula for calculating the conversion rate of element C is (carbon content of crude syngas at the outlet - carbon content of carbon dioxide at the inlet) / carbon content in the inlet coal; S2. Collect the operating parameters of the gasifier over a certain period of time, wherein the operating parameters are the gasifier's input and output parameters and parameters of various operating states.

[0045] Using flow, temperature, and pressure sensors from the actual production site, data such as flow, temperature, and pressure are collected over a period of time. The collected data is then transmitted to a remote computer, and the input data is fed into the theoretical model via a communication interface for the calculation of theoretical model parameter values.

[0046] As an optional embodiment, the input parameters of the gasifier include coal quantity, coal composition, coal ash composition analysis, coal calorific value, oxygen content, steam flow rate, nitrogen or carbon dioxide flow rate, operating pressure, and operating temperature. The theoretical model calculates the output parameters of the gasifier, including crude syngas production, crude syngas composition, carbon conversion rate, heat generation of the gasifier, and reaction temperature of the gasifier.

[0047] Specifically, the operating status of the gasifier is recorded over a certain period of time. Example parameters are as follows: coal quantity M1 kg / s; coal composition: Cwt%, Hwt%, Owt%, Nwt%, Swt%, H2Owt%, ASHwt%; coal ash composition analysis: SiO2wt%, Al2O3wt%, Fe2O3wt%, MgOwt%, CaOwt%, Na2Owt%, K2Owt%, TiO2wt%, SO3wt%, P2O5wt%.

[0048] The calorific value of coal is Q0 kJ / kg, and the CO2 produced during coal transportation is V.CO2 Nm 3 / s, conveying temperature is T1℃, oxygen quantity is V O2-1 Nm 3 / s, conveying temperature is T2℃, gasifier operating pressure is P0MPa, crude syngas production of gasifier is nNm 3 / s, the crude syngas composition is CO mol%, CO2 mol%, H2 mol%, H2O mol%, CH4 mol%, N2 mol%.

[0049] The concentrations of other components are calculated values. The carbon conversion rate of the gasifier is C0%, and the heat output of the gasifier is Q. out kJ / s.

[0050] S3. Based on the collected operating parameters, fit parameters a1, a2, a3, a4, a5, and a6 to complete the establishment of the theoretical model.

[0051] As an optional embodiment, the fitting parameters a1, a2, a3, a4, a5, and a6 include at least one of the following: The output parameters of the gasifier are calculated using numerical methods. The output parameters of the gasifier are calculated using a multi-point numerical fitting method. The output parameters of the gasifier are calculated using an artificial neural network algorithm.

[0052] As an optional embodiment, the method of calculating the gasifier output parameters using an artificial neural network algorithm includes: Based on the gasifier's input and output parameters, and combined with the theoretical model, the fitting parameters are obtained using an artificial neural network algorithm.

[0053] Specifically, the solution of the fitting parameters is as follows: Figure 3 As shown, given the data values ​​on the left and right sides (derived from the operating parameters), and combining them with the theoretical model, a1, a2, a3, a4, a5, and a6 can be obtained using the BP neural network algorithm.

[0054] S4. Based on the collected input parameters of the gasifier, calculate the output parameters of the gasifier using the theoretical model.

[0055] S5. Calculate the difference between the output parameters of the theoretical model and the actual output parameters of the gasifier using the theoretical model. Specifically, the output parameters include the crude syngas yield, crude syngas composition, and the carbon conversion rate of the gasifier. Compare the actual output parameters with the output parameters of the theoretical model. If the difference between the two does not meet the error range, return to step two; otherwise, proceed to step one.

[0056] S6. As an optional embodiment, if the difference meets the error range, the error range is ±0.1%.

[0057] The theoretical model is used to calculate the output parameters of the gasifier after modifying the coal and oxygen quantities. The performance of the gasifier is judged by the evaluation criteria, thereby monitoring and adjusting the working status of the coal gasifier.

[0058] As an optional embodiment, the evaluation criteria include at least one of the following: The profit per ton of coal is the highest; The coal consumption per unit of effective gas production is the lowest; It has the highest carbon conversion rate; The effective gas production is the highest.

[0059] Users can choose one, two, or three evaluation criteria to obtain their own optimization parameters according to their needs. For example... Figure 4 The figure shows the optimization process, where solid dots represent operating values ​​and curves represent calculated values. As shown in the figure, the oxygen-to-coal ratio is ~0.71 when maximizing profit.

[0060] This invention establishes a model of gasifier operating performance by combining mass and energy conservation, chemical thermodynamics and chemical kinetics theoretical calculations and actual field operation data, thereby effectively simulating the operating state of the gasifier and providing a reference for adjusting the performance of the gasifier.

[0061] The above embodiments are merely exemplary embodiments of this application and are not intended to limit this application. Those skilled in the art can make various modifications or equivalent substitutions to this application within the scope and nature of this application, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this application.

Claims

1. A method for optimizing the operating performance of a gasifier, characterized in that, Includes the following steps: S1. Establish a theoretical model for the operational performance analysis of the gasifier, including at least: S101. Determining Model Variables: The raw material is pulverized coal, and N2 or CO2 is used as the fluidizing gas to transport the pulverized coal at a flow rate of V. N2 or V CO2 The raw material reacts with O2 at operating pressure P and operating temperature T; The formula for calculating the operating temperature T is: in, Let n be the enthalpy of substance i at the gasifier inlet at temperature T. i Where i is the number of moles of the inlet substance, and Q is the heat output of the gasifier; The composition of the raw materials is expressed as the mass fractions of C, H, O, N, S, ash, and H2O. The ash content is expressed as the mass fractions of SiO2, Al2O3, Fe2O3, MgO, CaO, Na2O, K2O, TiO2, SO3, and P2O5. The energy of the raw materials is expressed as their calorific value. The crude syngas is generated, and the crude syngas components include CO, CO2, H2, H2O, CH4, N2, NH3, HCN, H2S and COS; The specific formula for calculating the mass of the raw materials in the gasifier is as follows: N c =n CO +n CO2 +n COS +n CH4 +n HCN N H =2n H2 +2n H2O +4n CH4 +3n NH3 +n HCN +2n H2S N O =n CO +2n CO2 +n H2O +n COS N N =2n N2 +n NH3 +n HCN N S =n H2S +n COS Where, N * n is the number of moles of the element at the gasifier inlet. * The number of moles of the exported material*; S102. Determination of reaction rate: The main chemical reactions occurring in the gasifier are C + O₂ = CO₂, C + 1 / 2O₂ = CO, C + CO₂ = 2CO, and C + H₂O = CO + H₂. The specific formulas for calculating their reaction rates are as follows: R1=a1*k1*n C *n O2 R2 = a2*k2*n C *[n O2 ] 0.5 R3 = a3* k3*n C *n CO2 R4= a4*k4*n C *n H2O Among them, R * k is the reaction rate. * n is the reaction rate constant. * a represents the molar amount of each component during the reaction process or at the gasifier outlet. * This is a correction factor between laboratory test values ​​and actual values ​​during gasifier operation; Other reactions occurring in the gasifier include COS + H2 = H2S + CO and N2 + 3H2 = 2NH3, with the following equilibrium constants: K1=P H2 *P COS / (P H2S *P CO ) K2=P N2 *[P H2 ] 3 / [P NH3 ] 2 Among them, K i P is the equilibrium constant for reaction i. * The partial pressure of a substance*; Other reactions occurring inside the gasifier include CO + 3H₂ = CH₄ + H₂O, CO₂ + 4H₂ = CH₄ + 2H₂O, and nCO + (2n+1)H₂ = C n H 2n+2 +nH2O、nCO2+(4n+1)H2=C n H 2n+2 +2nH2O, where the CH4 concentration and the operating temperature T satisfy the relationship n CH4 =a5exp(a6 / T), C n H 2n+2 The content is negligible; S103. Determination of carbon conversion rate in gasifier: The formula for calculating the conversion rate of element C is (carbon content of crude syngas at the outlet - carbon content of carbon dioxide at the inlet) / carbon content in the inlet coal; S2. Collect the operating parameters of the gasifier over a certain period of time, wherein the operating parameters are the gasifier's input and output parameters and parameters of various operating states; S3. Based on the collected operating parameters, fit parameters a1, a2, a3, a4, a5, and a6 to complete the establishment of the theoretical model. S4. Based on the collected gasifier input parameters, calculate the gasifier output parameters using the theoretical model; S5. Calculate the difference between the output parameters of the theoretical model and the actual output parameters of the gasifier using the theoretical model; S6. When the difference meets the error range, the output parameters of the gasifier after modifying the coal quantity and oxygen quantity are calculated using the theoretical model. The excellent performance of the gasifier is judged by the evaluation criteria, thereby monitoring and adjusting the working status of the coal gasifier.

2. The method according to claim 1, characterized in that, The input parameters of the gasifier include coal quantity, coal composition, coal ash composition analysis, coal calorific value, oxygen content, steam flow rate, nitrogen or carbon dioxide flow rate, operating pressure, and operating temperature. The theoretical model calculates the output parameters of the gasifier, including crude syngas production, crude syngas composition, carbon conversion rate, heat generation of the gasifier, and reaction temperature of the gasifier.

3. The method according to claim 1, characterized in that, The error range is ±0.1%.

4. The method according to claim 1, characterized in that, The reaction rate constant is obtained in at least one of the following ways: Obtained by analyzing the chemical reactivity of coal using the national standard method; Obtained by thermogravimetric analysis of the chemical reactivity of coal; This information was obtained by analyzing the chemical reactivity of coal using a drip furnace.

5. The method according to claim 1, characterized in that, The fitting parameters a1, a2, a3, a4, a5, and a6 include at least one of the following: The output parameters of the gasifier are calculated using numerical methods. The output parameters of the gasifier are calculated using a multi-point numerical fitting method. The output parameters of the gasifier are calculated using an artificial neural network algorithm.

6. The method according to claim 1, characterized in that, The evaluation criteria include at least one of the following: The profit per ton of coal is the highest; The coal consumption per unit of effective gas production is the lowest; It has the highest carbon conversion rate; The effective gas production is the highest.

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