A process for coupling coal pyrolysis and pulverized coal gasification

Abstract

The present application belongs to the technical field of coal processing and analysis, and provides a process method for coupling of coal pyrolysis and pulverized coal gasification, comprising: determining a pyrolysis reaction rate interval and a gasification rate interval; extracting carbon conversion efficiency under different char residence time in the coupling reaction of coal pyrolysis and pulverized coal gasification corresponding to the pyrolysis reaction rate interval and the gasification rate interval, constructing a char residence time-carbon conversion efficiency curve, identifying a carbon conversion efficiency inflection point, and linearly fitting the char residence time-carbon conversion efficiency curve to analyze and determine a minimum limited char gasification residence time, and combining the carbon conversion efficiency inflection point to determine a char gasification residence interval as a char residence time adjustment target of a next preset analysis period; in the next preset analysis period, according to the difference between the pyrolysis reaction rate interval and the gasification rate interval, performing dynamic update judgment and dynamic update operation of the char residence time adjustment target to ensure that the carbon conversion efficiency meets the standard and avoid energy waste.

Description

Technical Field

[0001] This invention belongs to the field of coal processing and analysis technology, specifically a process method that couples coal pyrolysis and pulverized coal gasification. Background Technology

[0002] Coal pyrolysis and pulverized coal gasification coupled processes have become a key technology direction for the clean and efficient conversion of coal because they enable the cascade utilization of coal resources.

[0003] However, in current processes, the setting of residence time for semi-coke gasification largely relies on experience or fixed parameters, lacking precise matching with the dynamic characteristics of the reaction. The pyrolysis and gasification reaction rates fluctuate with feedstock characteristics and operating conditions. Existing solutions lack a mechanism linking rate and residence time, leading to an imbalance in carbon conversion efficiency control: too short a residence time results in insufficient carbon conversion and significant resource waste; too long a residence time increases energy consumption and equipment load, reducing process economics. Furthermore, traditional methods cannot respond in real-time to changes in the rate range, making it difficult to dynamically adjust residence time parameters, resulting in poor process stability and large fluctuations in carbon conversion efficiency, hindering the optimization, upgrading, and industrialization of the coupled process.

[0004] Therefore, the present invention provides a process method that couples coal pyrolysis and pulverized coal gasification. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0006] The technical solution adopted by this invention to solve its technical problem is: a process method coupling coal pyrolysis and pulverized coal gasification, comprising:

[0007] Step S10: By analyzing and determining the pyrolysis reaction rate range and the gasification rate range within a preset analysis period during the coupling process of coal pyrolysis and pulverized coal gasification;

[0008] Step S20: Extract the carbon conversion efficiency of coal pyrolysis and pulverized coal gasification coupling reaction under different semi-coke residence times in the pyrolysis reaction rate range and gasification rate range, construct the semi-coke residence time-carbon conversion efficiency curve, and identify the inflection point of carbon conversion efficiency.

[0009] Step S30: Using the inflection point of carbon conversion efficiency as the dividing line, perform linear fitting on the semi-coke residence time-carbon conversion efficiency curve, determine the correlation type between semi-coke residence time and carbon conversion efficiency before the carbon conversion efficiency reaches the inflection point, and determine the minimum limit of semi-coke gasification residence time.

[0010] Step S40: Based on the inflection point of carbon conversion efficiency, determine the maximum limit time for semi-coke gasification residence, and combine it with the minimum limit time for semi-coke gasification residence to determine the semi-coke gasification residence range, which serves as the target for adjusting the semi-coke residence time in the next preset analysis period.

[0011] Step S50: In the next preset analysis period, based on the difference between the pyrolysis reaction rate range and the gasification rate range, dynamically update the target for adjusting the semi-coke residence time and perform dynamic update operations.

[0012] As a further aspect of the present invention: the process of determining the pyrolysis reaction rate range and the gasification rate range is as follows:

[0013] Obtain the pyrolysis reaction rate and gasification rate at different monitoring time points within a preset analysis period;

[0014] The maximum pyrolysis reaction rate and the minimum pyrolysis reaction rate are selected as endpoints to construct the pyrolysis reaction rate range;

[0015] By selecting the maximum and minimum gasification rates as endpoints, a gasification rate range is constructed.

[0016] As a further aspect of the present invention: the process of identifying the inflection point of carbon conversion efficiency is as follows:

[0017] The sigmoid function was used to fit the half-coke dwell time-carbon conversion efficiency curve to obtain the curve function model f(x). The first derivative of the curve function model f'(x) was calculated, and the second derivative of the curve function model f''(x) was calculated based on the first derivative.

[0018] Taking the derivative of the second derivative f''(x)=0, the solution obtained is the candidate inflection point X of the duration. 候选 ;

[0019] At the inflection point of candidate duration X 候选 Identifying the inflection point X of half-focus dwell time 拐点 Inflection point of semi-focal dwell time X 拐点 The carbon conversion efficiency corresponding to the half-coke dwell time-carbon conversion efficiency curve is the inflection point of carbon conversion efficiency.

[0020] As a further aspect of the present invention: identifying the inflection point X of the half-focus dwell time. 拐点 The method is as follows:

[0021] X < X 拐点 When f''(x)>0 and X>X 拐点 When f''(x) < 0.

[0022] As a further aspect of the present invention: the process for determining the correlation type between the half-coke dwell time before the carbon conversion efficiency reaches the inflection point and the carbon conversion efficiency is as follows:

[0023] Using the inflection point of carbon conversion efficiency as a dividing line, the curve of half-coke dwell time-carbon conversion efficiency before the inflection point is obtained by linear fitting using the least squares method. The goodness of fit is calculated, and the correlation type between half-coke dwell time and carbon conversion efficiency before the inflection point is determined based on the goodness of fit.

[0024] As a further aspect of the present invention: the process of determining the minimum required residence time for semi-coke gasification includes:

[0025] If the correlation type is linear, then the minimum threshold of carbon conversion efficiency is obtained according to the carbon conversion efficiency requirement, and the minimum threshold of carbon conversion efficiency is substituted into the fitting model to obtain the minimum residence time of semi-coke gasification.

[0026] As a further aspect of the present invention, the process of determining the minimum required residence time for semi-coke gasification also includes:

[0027] If the correlation type is nonlinear, then the minimum threshold of carbon conversion efficiency is substituted into the curve function model f(x) to obtain the minimum residence time limit for semi-coke gasification.

[0028] As a further aspect of the present invention: the process of determining the semi-coke gasification residence range is as follows:

[0029] The half-coke residence time corresponding to the inflection point of carbon conversion efficiency is taken as the maximum limit of half-coke gasification residence time. The minimum limit of half-coke gasification residence time and the maximum limit of half-coke gasification residence time are taken as endpoints to construct the half-coke gasification residence range, namely [minimum limit of half-coke gasification residence time, maximum limit of half-coke gasification residence time].

[0030] As a further aspect of the present invention: the process of dynamically updating and determining the target for adjusting the half-focal dwell time is as follows:

[0031] Obtain the pyrolysis reaction rate range and gasification rate range within the next preset analysis period, and compare them with the pyrolysis reaction rate range and gasification rate range within the preset analysis period, specifically:

[0032] If the pyrolysis reaction rate range in the next preset analysis period is within the pyrolysis reaction rate range in the preset analysis period and the gasification rate range in the next preset analysis period is within the gasification rate range in the preset analysis period, then it means that there is no need to update the half-coke residence time adjustment target.

[0033] If the pyrolysis reaction rate range in the next preset analysis period is not within the pyrolysis reaction rate range in the preset analysis period, or the gasification rate range in the next preset analysis period is not within the gasification rate range in the preset analysis period, then it means that the target for adjusting the half-coke residence time needs to be updated.

[0034] As a further aspect of the present invention: the dynamic update operation process is as follows:

[0035] The next preset analysis period is integrated with the preset analysis period to obtain a new preset analysis period. Based on the pyrolysis reaction rate and gasification rate within the new preset analysis period, steps S10-S50 are iteratively performed to achieve dynamic updating of the target for adjusting the half-coke dwell time.

[0036] The beneficial effects of this invention are as follows: First, by analyzing the pyrolysis and gasification rates within a preset analysis period, the corresponding rate range is determined, where rate monitoring combined with high-precision equipment and professional algorithms ensures data accuracy. Then, the carbon conversion efficiency at different residence times within this rate range is extracted, a curve is constructed, and efficiency inflection points are identified through S-shaped function fitting and second-order derivative analysis. Subsequently, the curve is fitted with the inflection point as the boundary, and the minimum residence time is determined based on the correlation type and carbon conversion efficiency requirements. The maximum residence time is determined with the time corresponding to the inflection point as the maximum residence time, forming the semi-coke gasification residence range. Finally, the differences in the rate range are compared in the next preset period, and the residence time adjustment target is dynamically updated. This scheme achieves precise matching between residence time and reaction dynamics, ensuring that carbon conversion efficiency meets the target while avoiding energy waste. Simultaneously, the dynamic update mechanism improves process adaptability, effectively solving the problems of rigid process parameters and imbalance between efficiency and economy in traditional processes. Attached Figure Description

[0037] The invention will now be further described with reference to the accompanying drawings.

[0038] Figure 1 This is a flowchart of the process of coupling coal pyrolysis and pulverized coal gasification according to an embodiment of the present invention;

[0039] Figure 2 This is a logic diagram of a process method coupling coal pyrolysis and pulverized coal gasification according to an embodiment of the present invention. Detailed Implementation

[0040] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0041] Example: Please refer to Figures 1-2 As shown in the embodiment of the present invention, a process method coupling coal pyrolysis and pulverized coal gasification includes the following steps:

[0042] Step S10: By analyzing and determining the pyrolysis reaction rate range and the gasification rate range within a preset analysis period during the coupling process of coal pyrolysis and pulverized coal gasification;

[0043] In step S10, the preset analysis time period in the coupled process of coal pyrolysis and pulverized coal gasification can be 20 min, 30 min, etc.;

[0044] In step S10, the monitoring and calculation method for the pyrolysis reaction rate and gasification rate is as follows:

[0045] Pyrolysis rate = Volatile matter release per unit time / Coal sample mass ;

[0046] Gasification rate = Half-coke consumption per unit time / Total mass of half-coke in the gasification zone ;

[0047] In step S10, the process of analyzing and determining the pyrolysis reaction rate range and the gasification rate range is as follows:

[0048] Obtain the pyrolysis reaction rate and gasification rate at different monitoring time points within a preset analysis period;

[0049] The maximum pyrolysis reaction rate and the minimum pyrolysis reaction rate are selected as endpoints to construct the pyrolysis reaction rate range;

[0050] By selecting the maximum and minimum gasification rates as endpoints, a gasification rate range is constructed.

[0051] For example, as shown in Table 1 below, the pyrolysis reaction rate and gasification rate at different monitoring time points within the preset analysis period are:

[0052] Table 1: Pyrolysis reaction rate and gasification rate at different monitoring time points;

[0053] In this implementation plan, it should be noted that the coupling process of coal pyrolysis and pulverized coal gasification is as follows:

[0054] Raw coal is washed, dried, and ground to produce dry pulverized coal. The dry pulverized coal is then fed into a pyrolysis reactor (such as a fluidized bed or moving bed reactor) for thermal decomposition. The high-temperature semi-coke generated from the pyrolysis reactor is directly transported to a pulverized coal gasifier (such as a Texaco or Shell fluidized bed gasifier) ​​for gasification. The syngas that comes out of the gasifier and has undergone waste heat recovery is then purified through dust removal, water washing, desulfurization, and decarbonization before it can be used industrially.

[0055] Step S20: Extract the carbon conversion efficiency of coal pyrolysis and pulverized coal gasification coupling reaction under different semi-coke residence times in the pyrolysis reaction rate range and gasification rate range, construct the semi-coke residence time-carbon conversion efficiency curve, and identify the inflection point of carbon conversion efficiency.

[0056] In step S20, the carbon conversion efficiency under different semi-coke residence times in the coal pyrolysis and pulverized coal gasification coupled reaction corresponding to the pyrolysis reaction rate range and gasification rate range is extracted from historical coal pyrolysis and pulverized coal gasification coupled reaction data.

[0057] The historical coal pyrolysis and pulverized coal gasification coupled reaction data includes carbon conversion efficiency data at different semi-coke residence times in the coal pyrolysis and pulverized coal gasification coupled reaction corresponding to different pyrolysis reaction rate ranges and gasification rate ranges.

[0058] In step S20, the carbon conversion efficiency at different semi-coke residence times in the coupled reaction of coal pyrolysis and pulverized coal gasification, corresponding to the pyrolysis reaction rate range and the gasification rate range, is extracted, as exemplarily shown in Table 2:

[0059] Table 2: Carbon conversion efficiency under different semi-coke residence times in pulverized coal gasification coupled reaction;

[0060] In step S20, the process of constructing the semi-coke residence time-carbon conversion efficiency curve is as follows:

[0061] Using the half-coke residence time as the X-axis and the carbon conversion efficiency as the Y-axis, the carbon conversion efficiency under different half-coke residence times is marked and connected in the XY coordinate system to obtain the half-coke residence time-carbon conversion efficiency curve.

[0062] In step S20, the process of identifying the inflection point of carbon conversion efficiency is as follows:

[0063] The half-coke dwell time-carbon conversion efficiency curve is fitted using a sigmoid function (such as the Boltzmann function or the Logistic function) to obtain the curve function model f(x). The first derivative of the curve function model f'(x) is calculated, and the second derivative of the curve function model f''(x) is calculated based on the first derivative.

[0064] It should be noted that the reason for using the sigmoid function for fitting is that the sigmoid function (such as the Boltzmann function or the Logistic function) describes the process of rapid growth and eventual saturation, which is in high agreement with the kinetics of gasification reaction.

[0065] In this implementation scheme, it can be understood that the physical meaning of the first derivative f'(x) and the second derivative f''(x) of the curve function model is as follows:

[0066] First derivative f'(x): represents the instantaneous rate of change of carbon conversion efficiency with residence time (unit: % / min). The larger the value, the faster the efficiency increases.

[0067] The second derivative f''(x) represents the trend of the instantaneous speed itself; f''(x)>0 indicates that the speed is increasing; f''(x)<0 indicates that the speed is decreasing.

[0068] Taking the derivative of the second derivative f''(x)=0, the solution obtained is the candidate inflection point X of the duration. 候选 ;

[0069] At the inflection point of candidate duration X 候选 Identifying the inflection point X of half-focus dwell time 拐点 Inflection point of semi-focal dwell time X 拐点 The carbon conversion efficiency corresponding to the half-coke residence time-carbon conversion efficiency curve is the inflection point of carbon conversion efficiency.

[0070] Among them, the inflection point X of half-focus dwell time was identified. 拐点 The method is as follows:

[0071] X < X 拐点 When f''(x)>0 and X>X 拐点 When, f''(x) < 0;

[0072] In this implementation plan, it can be understood that the inflection point of carbon conversion efficiency is the critical position where the carbon conversion efficiency changes from a rapid increase to a slow increase as the half-coke residence time increases. Therefore, the second derivative solution method is used to analyze the rate of change of carbon conversion efficiency to determine the inflection point of carbon conversion efficiency.

[0073] Step S30: Using the inflection point of carbon conversion efficiency as the dividing line, perform linear fitting on the semi-coke residence time-carbon conversion efficiency curve, determine the correlation type between semi-coke residence time and carbon conversion efficiency before the carbon conversion efficiency reaches the inflection point, and determine the minimum limit of semi-coke gasification residence time.

[0074] In step S30, the process of determining the correlation type between the half-coke dwell time before the carbon conversion efficiency reaches the inflection point and the carbon conversion efficiency is as follows:

[0075] Using the inflection point of carbon conversion efficiency as the dividing line, the half-coke dwell time-carbon conversion efficiency curve before the inflection point of carbon conversion efficiency is linearly fitted using the least squares method to obtain the fitting model, and calculate the goodness of fit. Based on the goodness of fit, the correlation type between half-coke dwell time and carbon conversion efficiency before the carbon conversion efficiency reaches the inflection point is determined.

[0076] If the goodness of fit is greater than or equal to the goodness of fit threshold, it means that the relationship between the half-coke dwell time and the carbon conversion efficiency before the carbon conversion efficiency reaches the inflection point is linear.

[0077] If the goodness of fit is less than the goodness of fit threshold, it means that the relationship between the half-coke dwell time and the carbon conversion efficiency before the carbon conversion efficiency reaches the inflection point is non-linear.

[0078] In step S30, the process of determining the minimum required residence time for semi-coke gasification is as follows:

[0079] If the correlation type is linear, then the minimum threshold of carbon conversion efficiency is obtained according to the carbon conversion efficiency requirement, and the minimum threshold of carbon conversion efficiency is substituted into the fitting model to obtain the minimum residence time of semi-coke gasification.

[0080] If the correlation type is nonlinear, then the minimum threshold of carbon conversion efficiency is substituted into the curve function model f(x) to obtain the minimum residence time limit for semi-coke gasification.

[0081] Understandably, the minimum threshold for carbon conversion efficiency is derived from the carbon conversion efficiency requirement, which represents the target carbon conversion efficiency that needs to be achieved in the coupled process of coal pyrolysis and pulverized coal gasification.

[0082] In this implementation plan, it should be noted that: the curve fitting based on the sigmoid function (Boltzmann / Logistic) in step S20 is a "global description" of the change in carbon conversion efficiency, with the aim of identifying the critical inflection point of "rapid growth → slow growth"; while the linear fitting of the "curve before the inflection point" in step S30 is only a "local precise analysis" of the interval where the minimum time limit is located (before the inflection point) - because the "minimum time limit" must fall before the inflection point (after the inflection point, the efficiency growth rate drops significantly, and from the perspective of process economy and energy consumption, the minimum time limit will not be set after the inflection point), so there is no need to use the curve function model of global description for general calculation. In addition, when linearly correlated, the linear fitting model is based on the "local data before the inflection point" for separate fitting, which completely fits the numerical correlation characteristics of the stage before the inflection point, and is more accurate than the calculation using the "Sigmoid model covering the entire time". For example, the S-shaped model (the fitted curve function model) describes the global trend of "growth → saturation". In the linear interval before the inflection point, using the S-shaped model to back-calculate short-term values ​​will result in a slight deviation due to the model's "saturation trend preset". The linear model does not have this problem. In nonlinear correlation, the linear model cannot describe the nonlinear correlation. Forcing its use will lead to serious deviations in the calculation results. The S-shaped curve function model itself is based on the "coal pyrolysis-gasification coupled reaction kinetics" (which fits the actual reaction law of "semi-coke gasification is first controlled by kinetics and then by diffusion"). It can accurately capture the nonlinear changes before the inflection point and ensure that the minimum calculation result is consistent with the essence of the reaction.

[0083] Step S40: Based on the inflection point of carbon conversion efficiency, determine the maximum limit time for semi-coke gasification residence, and combine it with the minimum limit time for semi-coke gasification residence to determine the semi-coke gasification residence range, which serves as the target for adjusting the semi-coke residence time in the next preset analysis period.

[0084] In step S40, the process of determining the semi-coke gasification residence range is as follows:

[0085] The half-coke residence time corresponding to the inflection point of carbon conversion efficiency is taken as the maximum limit of half-coke gasification residence time. The minimum limit of half-coke gasification residence time and the maximum limit of half-coke gasification residence time are taken as endpoints to construct the half-coke gasification residence range, namely [minimum limit of half-coke gasification residence time, maximum limit of half-coke gasification residence time];

[0086] In step S40, the semi-coke gasification residence interval is used as the semi-coke residence time adjustment target for the next preset analysis period. That is, at the beginning of the next preset analysis period, the semi-coke residence time is set according to the semi-coke gasification residence interval as the set adjustment target.

[0087] Step S50: In the next preset analysis period, based on the difference between the pyrolysis reaction rate range and the gasification rate range, dynamically update the target for adjusting the semi-coke residence time and perform dynamic update operations.

[0088] In step S50, the process of dynamically updating and determining the target for adjusting the half-focal dwell time is as follows:

[0089] Obtain the pyrolysis reaction rate range and gasification rate range within the next preset analysis period, and compare them with the pyrolysis reaction rate range and gasification rate range within the preset analysis period, specifically:

[0090] If the pyrolysis reaction rate range in the next preset analysis period is within the pyrolysis reaction rate range in the preset analysis period and the gasification rate range in the next preset analysis period is within the gasification rate range in the preset analysis period, then it means that there is no need to update the half-coke residence time adjustment target, and no operation is performed.

[0091] Conversely, if the pyrolysis reaction rate range in the next preset analysis period is not within the pyrolysis reaction rate range in the preset analysis period, or the gasification rate range in the next preset analysis period is not within the gasification rate range in the preset analysis period, then it means that the target for adjusting the half-coke residence time needs to be updated.

[0092] It is understandable that if the pyrolysis reaction rate range in the next preset analysis period is not within the pyrolysis reaction rate range in the preset analysis period, or the gasification rate range in the next preset analysis period is not within the gasification rate range in the preset analysis period, it means that the data such as the pyrolysis reaction rate range and the gasification rate range have changed. Therefore, the preset analysis period is re-integrated, and the target for iterative and dynamic adjustment of the half-coke residence time is updated according to the data in the preset analysis period.

[0093] In step S50, the dynamic update operation process is as follows:

[0094] The next preset analysis period is integrated with the preset analysis period to obtain a new preset analysis period. Based on the pyrolysis reaction rate and gasification rate within the new preset analysis period, steps S10-S50 are iteratively performed to achieve dynamic updating of the target for adjusting the half-coke dwell time.

[0095] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A process method coupling coal pyrolysis and pulverized coal gasification, characterized in that: include: Step S10: By analyzing and determining the pyrolysis reaction rate range and the gasification rate range within a preset analysis period during the coupling process of coal pyrolysis and pulverized coal gasification; Step S20: Extract the carbon conversion efficiency of coal pyrolysis and pulverized coal gasification coupling reaction under different semi-coke residence times in the pyrolysis reaction rate range and gasification rate range, construct the semi-coke residence time-carbon conversion efficiency curve, and identify the inflection point of carbon conversion efficiency. The process of identifying the inflection point of carbon conversion efficiency is as follows: Using the half-coke dwell time as the X-axis and carbon conversion efficiency as the Y-axis, the carbon conversion efficiency under different half-coke dwell times is marked and connected in the XY coordinate system to obtain the half-coke dwell time-carbon conversion efficiency curve. The half-coke dwell time-carbon conversion efficiency curve is fitted with a sigmoid function to obtain the curve function model f(x). The first derivative f'(x) of the curve function model is calculated, and the second derivative f''(x) of the curve function model is calculated based on the first derivative. Taking the derivative of the second derivative f''(x)=0, the solution obtained is the candidate inflection point X of the duration. 候选 ; At the inflection point of candidate duration X 候选 Identifying the inflection point X of half-focus dwell time 拐点 Inflection point of semi-focal dwell time X 拐点 The carbon conversion efficiency corresponding to the half-coke residence time-carbon conversion efficiency curve is the inflection point of carbon conversion efficiency. Identify the inflection point X of half-focus dwell time 拐点 The method is as follows: X < X 拐点 When f''(x)>0 and X>X 拐点 When f''(x) < 0; the inflection point of carbon conversion efficiency marks the critical position where carbon conversion efficiency changes from a rapid increase to a slow increase as the residence time of semi-coke increases. Step S30: Using the inflection point of carbon conversion efficiency as the dividing line, perform linear fitting on the semi-coke residence time-carbon conversion efficiency curve, determine the correlation type between semi-coke residence time and carbon conversion efficiency before the carbon conversion efficiency reaches the inflection point, and determine the minimum limit of semi-coke gasification residence time. Step S40: Based on the inflection point of carbon conversion efficiency, determine the maximum limit time for semi-coke gasification residence, and combine it with the minimum limit time for semi-coke gasification residence to determine the semi-coke gasification residence range, which serves as the target for adjusting the semi-coke residence time in the next preset analysis period. Step S50: In the next preset analysis period, based on the difference between the pyrolysis reaction rate range and the gasification rate range, dynamically update the target for adjusting the semi-coke residence time and perform dynamic update operations.

2. The process method for coupling coal pyrolysis and pulverized coal gasification according to claim 1, characterized in that: The process of determining the pyrolysis reaction rate range and the gasification rate range is as follows: Obtain the pyrolysis reaction rate and gasification rate at different monitoring time points within a preset analysis period; The maximum pyrolysis reaction rate and the minimum pyrolysis reaction rate are selected as endpoints to construct the pyrolysis reaction rate range; By selecting the maximum and minimum gasification rates as endpoints, a gasification rate range is constructed.

3. The process method for coupling coal pyrolysis and pulverized coal gasification according to claim 1, characterized in that: The process for determining the correlation between the residence time of the coke before the carbon conversion efficiency reaches the inflection point and the carbon conversion efficiency is as follows: Using the inflection point of carbon conversion efficiency as a dividing line, the curve of half-coke dwell time-carbon conversion efficiency before the inflection point is obtained by linear fitting using the least squares method. The goodness of fit is calculated, and the correlation type between half-coke dwell time and carbon conversion efficiency before the inflection point is determined based on the goodness of fit.

4. The process method for coupling coal pyrolysis and pulverized coal gasification according to claim 3, characterized in that: The process of determining the minimum residence time for semi-coke gasification includes: If the correlation type is linear, then the minimum threshold of carbon conversion efficiency is obtained according to the carbon conversion efficiency requirement, and the minimum threshold of carbon conversion efficiency is substituted into the fitting model to obtain the minimum residence time of semi-coke gasification.

5. The process method for coupling coal pyrolysis and pulverized coal gasification according to claim 1, characterized in that: The process of determining the minimum residence time for semi-coke gasification also includes: If the correlation type is nonlinear, then the minimum threshold of carbon conversion efficiency is substituted into the curve function model f(x) to obtain the minimum residence time limit for semi-coke gasification.

6. The process method for coupling coal pyrolysis and pulverized coal gasification according to claim 1, characterized in that: The process of determining the residence range of semi-coke gasification is as follows: The half-coke residence time corresponding to the inflection point of carbon conversion efficiency is taken as the maximum limit of half-coke gasification residence time. The minimum limit of half-coke gasification residence time and the maximum limit of half-coke gasification residence time are taken as endpoints to construct the half-coke gasification residence range, namely [minimum limit of half-coke gasification residence time, maximum limit of half-coke gasification residence time].

7. The process method for coupling coal pyrolysis and pulverized coal gasification according to claim 1, characterized in that: The process of dynamically updating and judging the target for adjusting the half-focus dwell time is as follows: Obtain the pyrolysis reaction rate range and gasification rate range within the next preset analysis period, and compare them with the pyrolysis reaction rate range and gasification rate range within the preset analysis period, specifically: If the pyrolysis reaction rate range in the next preset analysis period is within the pyrolysis reaction rate range in the preset analysis period and the gasification rate range in the next preset analysis period is within the gasification rate range in the preset analysis period, then it means that there is no need to update the half-coke residence time adjustment target. If the pyrolysis reaction rate range in the next preset analysis period is not within the pyrolysis reaction rate range in the preset analysis period, or the gasification rate range in the next preset analysis period is not within the gasification rate range in the preset analysis period, then it means that the target for adjusting the half-coke residence time needs to be updated.

8. The process method for coupling coal pyrolysis and pulverized coal gasification according to claim 1, characterized in that: The dynamic update process is as follows: The next preset analysis period is integrated with the preset analysis period to obtain a new preset analysis period. Based on the pyrolysis reaction rate and gasification rate within the new preset analysis period, steps S10-S50 are iteratively performed to achieve dynamic updating of the target for adjusting the half-coke dwell time.

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