Method and system for guiding new coal purchase of coal gasifier by using digital twinning

Abstract

The embodiment of the invention provides a method and a system for guiding new coal purchase of a coal gasifier by using digital twinning. The method comprises the following steps: determining basic physical properties of a coal type to be processed; based on the basic physical property of the to-be-treated coal type, the gasification temperature range of the to-be-treated coal type is obtained through a viscosity-temperature equation; and determining a water-coal ratio and an oxygen-coal ratio when the objective function is optimal through a linear approximation algorithm by taking the economic benefit as the objective function, taking the gasification temperature range as a constraint condition, depending on process simulation software and taking the water-coal ratio and the oxygen-coal ratio as adjusting parameters, so as to determine the optimal new coal type.

Description

Technical Field

[0001] The embodiments of the present application belong to the technical field of coal gasification process optimization, and in particular, relate to a method and system for guiding the purchase of new coal for a coal gasification furnace using digital twins. Background Art

[0002] Coal gasification is the leader of coal chemical plants. It converts coal into effective synthesis gas through gasifiers, which serves as the basic raw material for downstream plants. The main cost of coal chemical enterprises is coal. However, coal prices fluctuate greatly with the market. In order to make profits, enterprises will give priority to coal with lower prices in the market. Different coals have different components, so the temperature and ash viscosity during the gasification process will be significantly different, which will affect the operating conditions of the gasifier. Different gasifier types also have requirements for the type of coal entering the furnace. Usually, new coal types need to be successfully tested before they can be purchased in large quantities. In order to ensure the stability of production during the production of coal gasification units, it is usually not possible to directly switch the current coal to the newly purchased coal type for trial burning, but to mix it with the current coal type for trial burning. The mixing ratio of the newly purchased coal type is gradually increased from low to low until the production is stable and the product quality requirements are met.

[0003] In the prior art, the mixing ratio of new coal types is gradually increased through trial burning of blended coal. During the production process, after each adjustment of the new ratio, the product of the gasifier needs to be analyzed after the production is stable, so as to serve as a guide for the next step. In actual production, the trial burning cycle is 20 to 30 days, which is a long time, and it is likely to miss a low-price time for suitable coal types. The existing method of trial burning of blended coal has the problems of long trial burning cycle, high cost consumption, and does not utilize actual production, and cannot provide fast and accurate guidance for coal gasification production and coal procurement.

[0004] Based on this, a new method and system using digital twins to guide the selection of new coal for gasification furnaces is needed. Summary of the invention

[0005] The embodiments of this specification provide a method and system for using digital twins to guide the selection of new coal for a coal gasification furnace, in order to solve some or all of the problems: the existing method of coal blending and trial burning has the problems of long trial burning cycles, high costs, and does not utilize actual production, and cannot provide fast and accurate guidance for coal gasification production and coal procurement.

[0006] To solve the above technical problems, the embodiments of this specification are implemented as follows:

[0007] The embodiment of this specification provides a method for guiding the purchase of new coal for a coal gasifier by using digital twins, the method comprising:

[0008] Determine the basic physical properties of the coal to be processed;

[0009] Based on the basic physical properties of the coal to be processed, the gasification temperature range of the coal to be processed is obtained by using the viscosity-temperature equation;

[0010] Taking economic benefit as the objective function and the gasification temperature range as the constraint condition, relying on process simulation software, taking the water-coal ratio and oxygen-coal ratio as adjustment parameters, the water-coal ratio and oxygen-coal ratio when the objective function is optimal are determined through a linear approximation algorithm to determine the optimal new coal type.

[0011] The embodiment of this specification also provides a system for guiding the purchase of new coal for a coal gasifier using digital twins, the system comprising:

[0012] Basic physical property determination module, determines the basic physical properties of the coal to be processed;

[0013] A gasification temperature range determination module, based on the basic physical properties of the coal to be processed, obtains the gasification temperature range of the coal to be processed through a viscosity-temperature equation;

[0014] The optimization module takes economic benefit as the objective function and the gasification temperature range as the constraint condition. Based on the process simulation software, the water-coal ratio and oxygen-coal ratio are used as adjustment parameters. The water-coal ratio and oxygen-coal ratio when the objective function is optimal are determined through a linear approximation algorithm to determine the optimal new coal type.

[0015] At least one of the above-mentioned technical solutions adopted in the embodiments of this specification can achieve the following beneficial effects: determining the basic physical properties of the type of coal to be processed; based on the basic physical properties of the type of coal to be processed, obtaining the gasification temperature range of the type of coal to be processed through the viscosity-temperature equation; taking economic benefit as the objective function, the gasification temperature range as the constraint condition, relying on process simulation software, taking the water-coal ratio and the oxygen-coal ratio as adjustment parameters, and determining the water-coal ratio and the oxygen-coal ratio when the objective function is optimal through a linear approximation algorithm, so as to determine the optimal new type of coal. This method takes into account the problem that the gasification temperature affects the viscosity of coal ash in the actual production process, so that the calculation results are more accurate. At the same time, this method can greatly shorten the cycle of coal blending and trial burning, and can quickly and accurately determine the optimal new type of coal, providing an objective basis for the procurement of new types of coal. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. Some specific embodiments of the present application will be described in detail in an illustrative and non-restrictive manner with reference to the drawings. The same reference numerals in the drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the drawings:

[0017] Figure 1A flow chart of a method for guiding the purchase of new coal for a coal gasifier using digital twins provided in an embodiment of this specification;

[0018] Figure 2 A framework diagram of a method for guiding the purchase of new coal for a coal gasifier using digital twins provided in an embodiment of this specification;

[0019] Figure 3 A schematic diagram of a system for using digital twins to guide the selection of new coal for a coal gasifier is provided for this illustrative embodiment. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only embodiments of a part of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present application.

[0021] Digital twins make full use of data such as physical models, sensors, and operation history, integrate multi-disciplinary, multi-physical, multi-scale, and multi-probability simulation processes, and complete mapping in virtual space to reflect the entire life cycle of the corresponding physical equipment. Digital twins are a concept that transcends reality and can be viewed as a digital mapping system of one or more important, interdependent equipment systems.

[0022] In the embodiments of this specification, digital twins are used to simulate the trial burning of coal blending through process simulation software, and constraints are used to optimize the coal blending process. The type of new coal to be purchased is then determined through the trial burning of coal blending to guide the purchase of new coal for the gasifier.

[0023] Figure 1 A flowchart of a method for using digital twins to guide the purchase of new coal for a coal gasifier is provided in the embodiment of this specification. From a program perspective, the execution subject of the method for using digital twins to guide the purchase of new coal for a coal gasifier is a program installed on an application server or application terminal. It can be understood that the method can be executed by any device, equipment, platform, or equipment cluster with computing and processing capabilities. Figure 1 As shown, the method includes:

[0024] Step S101: Determine the basic physical properties of the coal to be processed.

[0025] In the embodiment of this specification, the coal type to be processed includes the current coal type and several candidate new coal types, and the current coal type is mixed with each candidate coal type according to a preset ratio as the coal type to be processed;

[0026] The basic physical properties of the coal to be processed include industrial analysis results, elemental analysis results and coal ash analysis results;

[0027] The industrial analysis results include: the percentage of fixed carbon, volatile matter, moisture and ash;

[0028] The element analysis results include: the proportions of carbon, hydrogen, oxygen, nitrogen, sulfur, and chlorine;

[0029] The coal ash analysis results include: SiO 2 、Al 2 O 3 , Fe 2 O 3 , CaO, MgO, K 2 O and Na 2 The proportion of O.

[0030] In a specific embodiment, the basic physical properties of the coal to be processed can be obtained through experiments or from coal suppliers. When the basic physical properties of the coal to be processed are obtained through experiments, industrial analysis and elemental analysis can be obtained through simulation software, and oxide analysis can be obtained by grinding and mixing coals of different proportions, calcining at high temperature in a muffle furnace to obtain coal ash, and then using chemical analysis to perform oxide analysis on the coal ash.

[0031] The methods for obtaining the basic physical properties of the coal to be processed all use existing technologies and will not be repeated here.

[0032] In the embodiments of this specification, the current coal type is the coal type currently in use, and the candidate new coal type is the new coal type intended for subsequent purchase, that is, in this application, one coal type needs to be determined from the candidate coal types as the new coal type for subsequent purchase. The types of the candidate new coal types are determined according to the specific situation, and can be two or more, depending on which coal types are intended to be selected for the new coal type.

[0033] In the embodiments of this specification, the preset ratio can be set manually, and generally a commonly used coal blending ratio set based on experience is used as the preset ratio. In the embodiments of this specification, the preset ratio can be: 2:1, 1:1, 1:2, 2:2, etc. The specific ratio of the preset ratio does not constitute a limitation of this application.

[0034] Step S103: Based on the basic physical properties of the coal to be processed, the gasification temperature range of the coal to be processed is obtained through the viscosity-temperature equation.

[0035] In a coal gasifier, in order to ensure the thickness of the coal ash adhering to the wall and avoid the ash solidifying and blocking the slag outlet, it is necessary to control the temperature of the gasifier to ensure that the viscosity of the coal ash is within a certain range. For example, in an embodiment of this specification, the viscosity of the coal ash of a certain gasifier type should be controlled within 4 - 43 Pa·s.

[0036] In the embodiment of this specification, obtaining the gasification temperature range of the coal type to be processed through the viscosity-temperature equation based on the basic physical properties of the coal type to be processed specifically includes:

[0037] Based on the basic physical properties of the coal type to be processed, determine the percentage content of coal ash;

[0038] Based on the percentage content of coal ash, determine the viscosity-temperature equation;

[0039] Based on the viscosity-temperature equation, obtain the gasification temperature range of the coal type to be processed.

[0040] In the embodiment of this specification, the calculation formula for the percentage content of coal ash is:

[0041]

[0042] Among them,

[0043] m represents the coal ash viscosity correlation coefficient;

[0044] Al 2 O 3 represents the chemical composition percentage % of Al 2 O 3 in the coal ash;

[0045] SiO 2 represents the chemical composition percentage % of SiO 2 in the coal ash;

[0046] Fe 2 O 3 represents the chemical composition percentage % of Fe 2 O 3 in the coal ash;

[0047] CaO represents the chemical composition percentage % of CaO in the coal ash;

[0048] MgO represents the chemical composition percentage % of MgO in the coal ash;

[0049] When 0.788 < m < 0.835, the viscosity-temperature expression is:

[0050] lgη = 12629 / T - 5.05m -1.89 -0.03

[0051] Among them,

[0052] η represents the viscosity of coal ash;

[0053] T represents the temperature of coal ash;

[0054] When m ≤ 0.788 or m ≥ 0.835, the viscosity-temperature expression is:

[0055] When T ≥ T 0 , lgη = 12629 / T - 5.05k -1.89 -0.03

[0056] When T ≤ T 0 , lgη = (0.086m - 0.107)(T - T 0 ) + lgη 0

[0057] Wherein,

[0058] T 0 represents the critical temperature of coal ash;

[0059] η 0 represents the critical viscosity of coal ash.

[0060] It should be noted that when 0.788 < m < 0.835, the coal ash slag belongs to vitreous slag; when m ≤ 0.788 or m ≥ 0.835, the coal ash slag belongs to crystalline slag. At this time, the viscosity curve is a piecewise function. Therefore, there are two viscosity expressions at this time.

[0061] In the embodiments of this specification, the expression of the critical viscosity of the coal ash is:

[0062] lgη 0 = 12629 / T 0 - 5.05k -1.89 - 0.03

[0063] Wherein,

[0064] η 0 represents the critical viscosity of coal ash;

[0065] T 0 represents the critical temperature of coal ash, T 0 = 341.4 + 1008.7n - 282.9n 2 + 25.1n 3 , n represents the temperature proportionality coefficient;

[0066] k represents the viscosity proportionality coefficient, and the expression of k is:

[0067]

[0068] T 0 The critical temperature of coal ash is an important parameter. Due to the requirement of liquid slag discharge, the operating temperature of the gasifier should be controlled above the sudden change temperature of coal ash viscosity. If the temperature is close, the viscosity of coal ash will increase sharply or even solidify with the temperature fluctuation, which will cause the gasifier to block and cause a shutdown accident.

[0069] Determining the gasification temperature range is a crucial step in the coal gasification process, because the gasification temperature directly affects the operational safety and efficiency of the gasifier. In the embodiments of this specification, the gasification temperature range can be determined by using the known coal ash slag composition to obtain the corresponding viscosity correlation formula, and then determining the corresponding gasification temperature range according to the viscosity range of the coal ash.

[0070] Step S105: Taking economic benefit as the objective function and the gasification temperature range as the constraint condition, relying on process simulation software, taking the water-coal ratio and oxygen-coal ratio as adjustment parameters, the water-coal ratio and oxygen-coal ratio when the objective function is optimal are determined through a linear approximation algorithm to determine the optimal new coal type.

[0071] In the embodiments of this specification, the process simulation software is used to realize the simulation process of coal blending trial burning. The specific type of the process simulation software can be any software or model that can realize coal blending trial burning. The specific type of the process simulation software does not constitute a limitation of this application.

[0072] The optimization of the linear approximation algorithm in the coal gasification process is mainly to simplify the calculation by linearizing the nonlinear problem, so as to quickly find an approximate optimal solution. In the present invention, the linear approximation algorithm is used to optimize the operating conditions of the gasifier to achieve maximum economic benefits.

[0073] The economic benefit formula is:

[0074] Economic benefit = specific coal consumption * coal price * coal proportion coefficient + specific oxygen consumption * oxygen price

[0075] in:

[0076] Specific coal consumption per production of 1000Nm 3 (CO+H 2 ) The coal mass flow rate in the model is divided by the effective gas production, and then multiplied by 1000.

[0077] Specific oxygen consumption per production 1000Nm 3 (CO+H 2 ) The oxygen volume flow rate in the model is divided by the effective gas production, and then multiplied by 1000.

[0078] The coal ratio coefficient is the proportion of newly purchased coal in the mixed coal. For example, in this example, the mixed coal is 1:1, so the coefficient is 1 / 2

[0079] The specific coal consumption and specific oxygen consumption can be read through the process simulation software.

[0080] In the embodiments of this specification, optimization is performed by a linear approximation algorithm, which specifically includes the following steps:

[0081] (1) Initialization: Set the initial water-coal ratio and oxygen-coal ratio, as well as the corresponding gasification temperature range.

[0082] (2) Linearization: Locally linearize the objective function and constraints near the current operating point. This means simplifying the nonlinear relationship into a series of straight lines so that the problem can be converted into a linear programming problem.

[0083] (3) Optimization solution: Use a linear programming solver to find the optimal solution. The specific approach is to gradually adjust the water-coal ratio and oxygen-coal ratio, recalculate the economic benefits after each adjustment, and check whether the gasification temperature constraint is met.

[0084] (4) Iterative update: If a water-coal ratio and oxygen-coal ratio combination that leads to higher economic benefits is found, the current operating point is updated and steps 2 and 3 are repeated until a satisfactory solution is found or the preset termination condition is reached.

[0085] (5) Result output: Output the optimal water-coal ratio and oxygen-coal ratio combination, as well as the corresponding economic benefits and corresponding coal blending ratio.

[0086] In the examples of this specification, the adjustment range of the oxygen-coal ratio is: 0.6 to 1.1.

[0087] In the embodiments of this specification, the adjustment range of the water-coal ratio is: 0.05 to 0.8.

[0088] When optimizing through the linear approximation algorithm, the oxygen-coal ratio is adjusted in steps of 0.01 based on the initial oxygen-coal ratio, increasing or decreasing by 0.01 each time to observe changes in economic benefits and repeatedly adjust until the optimal oxygen-coal ratio that maximizes economic benefits is found.

[0089] When optimizing through the linear approximation algorithm, the water-coal ratio is adjusted in steps of 0.02 based on the initial water-coal ratio, increasing or decreasing by 0.02 each time to observe changes in economic benefits and repeatedly adjust until the optimal water-coal ratio that maximizes economic benefits is found.

[0090] In the examples of this specification, economic benefit refers to the production of effective gas (H 2+CO) is used as the objective function for screening the best new coal type.

[0091] In order to further understand the method for determining a new type of coal based on trial burning of coal blending provided in the embodiments of this specification, it will be further explained below.

[0092] Figure 2 This is a framework diagram of a method for using digital twins to guide the purchase of new coal for a coal gasifier provided in an embodiment of this specification. Figure 2 As shown in the figure, the basic physical properties of the coal to be processed composed of the current coal type and the candidate new coal type are determined; the gasification temperature range is obtained based on the viscosity-temperature equation; with the gasification temperature range as a constraint condition, the water-coal ratio and the oxygen-coal ratio are adjusted by relying on the process simulation software to obtain the maximum economic benefit, and the new coal type corresponding to the coal type to be processed when the economic benefit is the largest is taken as the optimal new coal type.

[0093] The embodiments of this specification further verify the method of using digital twins to guide the purchase of new coal for coal gasification furnaces.

[0094] The current coal type is used as coal type 1, and the planned coal type 2 and the planned coal type 3 are used as candidate new coal types. Coal type 1 and coal type 2, coal type 1 and coal type 3 are mixed according to the preset proportions as the coal types to be processed. After the coal types to be processed are burned, effective gas (CO+H 2 ), through the method provided in this embodiment, the new coal type corresponding to the coal type to be processed when the economic benefit is the largest is selected as the optimal new coal type.

[0095] Elemental analysis, industrial analysis and coal ash analysis were carried out on the coal types. The analysis results are shown in Tables 1, 2, 3 and 4.

[0096] Table 1: Elemental analysis and industrial analysis results of coal type 1

[0097]

[0098] Table 2: Elemental analysis and industrial analysis results of coal type 2

[0099]

[0100] Table 3: Elemental analysis and industrial analysis results of three types of coal

[0101]

[0102] Table 4 Coal ash analysis results

[0103] <![CDATA[SiO 2 ]]> <![CDATA[Al 2 THE 3 ]]> <![CDATA[Fe 2 THE 3 ]]> CaO MgO Coal Type 1 47.9 25.59 9.69 7.19 4.34 Coal Type 2 50.38 27.44 3.21 6.71 5.11 Coal Type 3 44.7 31.9 4.66 8.71 2.88

[0104] Based on the elemental analysis results, industrial analysis structure and coal ash analysis results of coal type 1, coal type 2 and coal type 3, the elemental analysis results, industrial analysis results and coal ash analysis results of the coal type to be processed are determined. See Tables 5, 6 and 7 for details.

[0105] Table 5: Elemental analysis results and industrial analysis results of coal type 1 and coal type 2 mixed in a ratio of 1:1

[0106]

[0107] Table 6: Elemental analysis results and industrial analysis results of coal type 1 and coal type 3 mixed in a ratio of 1:1

[0108]

[0109] Table 7: Analysis results of coal ash from a 1:1 mixture of coal type 1 and coal type 2, and coal type 1 and coal type 3

[0110]

[0111] Based on the above coal ash analysis results, the viscosity-temperature equation is used to obtain the gasification temperature range. When the applicable viscosity range of the gasifier is 4 to 43 Pa·s, the applicable gasification temperature range under the corresponding scheme is calculated respectively, as shown in Table 8 for details.

[0112] Table 8: Gasification temperature range corresponding to the 1:1 mixture of coal type 1 and coal type 2, coal type 1 and coal type 3

[0113] m slag body Tmin Tmax Coal type 1 and coal type 2 are mixed in a ratio of 1:1 0.81626 Vitreous slag 1569.98 1391.554 Coal type 1 and coal type 3 are mixed in a ratio of 1:1 0.819961 Vitreous slag 1582.391 1401.296

[0114] Taking the gasification temperature obtained above as the constraint condition, and the oxygen-coal ratio (range 0.6-1.1) and water-coal ratio (range 0.05-0.8) as the control variables, the material economic consumption calculation optimization function values ​​under the two schemes are calculated respectively:

[0115] Considering that coal type 2 is 560 yuan / ton, coal type 3 is 520 yuan / ton, and oxygen is 300 yuan / ton, the planned coal consumption rate is 19409 kg / h. At this time, the optimization function for calculating the economic consumption of coal type 2 is:

[0116] 560*Specific coal consumption / 2+300*Specific oxygen consumption

[0117] At this time, the optimization function for calculating the economic consumption of coal type 3 is:

[0118] 520*Specific coal consumption / 2+300*Specific oxygen consumption

[0119] The method provided in the embodiments of this specification is used to further calculate the oxygen-coal ratio, water-coal ratio, temperature and objective function value. The calculation results are shown in Table 9.

[0120] Table 9: Optimization results

[0121] Oxygen-Coal Ratio Water-coal ratio temperature Optimizing function values Coal type 1 and coal type 2 are mixed in a ratio of 1:1 0.78451 0.1864 1394.8 225350 Coal type 1 and coal type 3 are mixed in a ratio of 1:1 0.78465 0.18225 1402.5 215370

[0122] From the above calculation results, we can see that when the coal blending ratio is 1:1, the economic consumption of purchasing coal type 3 is relatively small. At this time, the oxygen-coal ratio is 0.78465, and the water-coal ratio is 0.18225. That is, when the total coal consumption is 19409kg / h, the oxygen consumption is 15229.27kg / h, and the water consumption is 3537.29kg / h.

[0123] The method for determining a new coal type based on coal blending trial burning provided in the embodiments of this specification can also be used to determine the process parameters of the new coal type during coal blending trial burning after the new coal type is determined, so as to achieve the purpose of saving costs and optimizing the trial burning process parameters. The method for determining a new coal type based on coal blending trial burning provided in the embodiments of this specification can also be used to determine the process parameters of coal blending trial burning. Specifically, a mixed coal type composed of the current coal type and the optimal new coal type in different mixing ratios is used as the mixed coal type to be processed, and the gasification temperature range is obtained based on the viscosity-temperature equation; the gasification temperature range is used as a constraint condition, and the water-coal ratio and the oxygen-coal ratio are adjusted to obtain the maximum economic benefit, and the coal blending conditions, water-coal ratio and oxygen-coal ratio process parameters when the economic benefit is the maximum are used as the coal blending trial burning process of the mixed coal type to be processed.

[0124] The embodiment of this specification provides a method for using digital twins to guide the selection of new coal for a coal gasifier, which determines the basic physical properties of the coal to be processed; based on the basic physical properties of the coal to be processed, the gasification temperature range of the coal to be processed is obtained through the viscosity-temperature equation; with economic benefit as the objective function and the gasification temperature range as the constraint condition, relying on process simulation software, with the water-coal ratio and oxygen-coal ratio as adjustment parameters, the water-coal ratio and oxygen-coal ratio when the objective function is optimal are determined through a linear approximation algorithm, and the optimal new coal type is determined. This method takes into account the problem that the gasification temperature affects the viscosity of coal ash in the actual production process, so that the calculation results are more accurate. At the same time, this method can greatly shorten the cycle of coal blending and trial burning, and can quickly and accurately determine the optimal new coal type, providing an objective basis for the purchase of new coal types.

[0125] The foregoing embodiments of this specification provide a method for using digital twins to guide the purchase of new coal for a coal gasifier. Based on the same idea, the embodiments of this specification also provide a system for using digital twins to guide the purchase of new coal for a coal gasifier. Figure 3 A schematic diagram of a system for guiding the purchase of new coal for a coal gasifier using digital twins is provided for this illustrative embodiment. Figure 3 As shown, the system includes:

[0126] The basic physical property determination module 301 determines the basic physical properties of the coal to be processed;

[0127] The gasification temperature range determination module 303 obtains the gasification temperature range of the coal to be processed by using the viscosity-temperature equation based on the basic physical properties of the coal to be processed;

[0128] The optimization module 305 takes economic benefit as the objective function, the gasification temperature range as the constraint condition, relies on process simulation software, takes the water-coal ratio and oxygen-coal ratio as adjustment parameters, and uses a linear approximation algorithm to determine the water-coal ratio and oxygen-coal ratio when the objective function is optimal, thereby determining the optimal new coal type.

[0129] In the embodiment of this specification, the coal type to be processed includes the current coal type and several candidate new coal types, and the current coal type is mixed with each candidate coal type according to a preset ratio as the coal type to be processed;

[0130] The basic physical properties of the coal to be processed include industrial analysis results, elemental analysis results and coal ash analysis results;

[0131] The industrial analysis results include: the percentage of fixed carbon, volatile matter, moisture and ash;

[0132] The element analysis results include: the proportions of carbon, hydrogen, oxygen, nitrogen, sulfur, and chlorine;

[0133] The coal ash analysis results include: SiO 2 、Al 2 O 3 , Fe 2 O 3 , CaO, MgO, K 2 O and Na 2 The proportion of O.

[0134] In the embodiment of this specification, based on the basic physical properties of the coal to be processed, the gasification temperature range of the coal to be processed is obtained by the viscosity-temperature equation, which specifically includes:

[0135] Determining the percentage of coal ash based on the basic physical properties of the coal to be processed;

[0136] Determining the viscosity-temperature equation based on the percentage of fly ash content;

[0137] Based on the viscosity-temperature equation, the gasification temperature range of the type of coal to be processed is obtained.

[0138] In the examples of this specification, the calculation formula for the percentage of the coal ash content is:

[0139]

[0140] in,

[0141] m represents the correlation coefficient of coal ash viscosity;

[0142] Al 2 O 3 represents the percentage of the chemical composition of Al 2 O 3 in coal ash;

[0143] SiO 2 represents the percentage of the chemical composition of SiO 2 in coal ash;

[0144] Fe 2 O 3 represents the percentage of the chemical composition of Fe 2 O 3 in coal ash;

[0145] CaO represents the percentage of the chemical composition of CaO in coal ash;

[0146] MgO represents the percentage of the chemical composition of MgO in coal ash;

[0147] When 0.788 < m < 0.835, the viscosity-temperature expression is:

[0148] lgη = 12629 / T - 5.05m -1.89 -0.03

[0149] where

[0150] η represents the viscosity of coal ash;

[0151] T represents the temperature of coal ash;

[0152] When m ≤ 0.788 or m ≥ 0.835, the viscosity-temperature expression is:

[0153] When T ≥ T 0 lgη = 12629 / T - 5.05k -1.89 -0.03

[0154] When T ≤ T 0 lgη = (0.086m - 0.107)(T - T 0 ) + lgη 0

[0155] where

[0156] T 0 represents the critical temperature of coal ash;

[0157] η 0 represents the critical viscosity of coal ash.

[0158] In the embodiments of this specification, the expression for the critical viscosity of the coal ash is:

[0159] lgη0 =12629 / T 0 -5.05k -1.89 -0.03

[0160] in,

[0161] η 0 It indicates the critical viscosity of fly ash;

[0162] T 0 represents the critical temperature of fly ash, T 0 =341.4+1008.7n-282.9n 2 +25.1n 3 , n represents the temperature proportionality coefficient;

[0163] k represents the viscosity proportionality coefficient, and the expression of k is:

[0164]

[0165] In the examples of this specification, the adjustment range of the oxygen-coal ratio is: 0.6 to 1.1.

[0166] In the embodiments of this specification, the adjustment range of the water-coal ratio is: 0.05 to 0.8.

[0167] In the embodiments of this specification, the formula for economic benefit is:

[0168] Economic benefit = specific coal consumption * coal price * coal proportion coefficient + specific oxygen consumption * oxygen price.

[0169] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for guiding the purchase of new coal for a coal gasifier using digital twins, characterized in that: The method includes: Determine the basic physical properties of the coal type to be processed; Based on the basic physical properties of the coal type to be processed, obtain the gasification temperature range of the coal type to be processed through the viscosity-temperature equation; Taking economic benefit as the objective function and the gasification temperature range as the constraint condition, relying on process simulation software, taking the water-coal ratio and oxygen-coal ratio as adjustment parameters, determine the water-coal ratio and oxygen-coal ratio when the objective function is optimal through the linear approximation algorithm to determine the optimal new coal type.

2. The method for guiding the purchase of new coal for a coal gasifier using digital twins as claimed in claim 1, characterized in that: The coal type to be processed includes the current coal type and several candidate new coal types, and the current coal type and each candidate coal type are mixed in a preset ratio as the coal type to be processed; The basic physical properties of the coal type to be processed include industrial analysis results, elemental analysis results and coal ash analysis results; The industrial analysis results include: the proportions of fixed carbon, volatile matter, moisture and ash; The elemental analysis results include: the proportions of carbon, hydrogen, oxygen, nitrogen, sulfur and chlorine; The coal ash analysis results include: the proportions of SiO2, Al2O3, Fe2O3, CaO, MgO, K2O and Na2O in the coal ash.

3. The method for guiding the purchase of new coal for a coal gasifier using digital twins as claimed in claim 1, characterized in that: The step of obtaining the gasification temperature range of the coal type to be processed through the viscosity-temperature equation based on the basic physical properties of the coal type to be processed specifically includes: Based on the basic physical properties of the coal type to be processed, determine the percentage content of coal ash; Based on the percentage content of coal ash, determine the viscosity-temperature equation; Based on the viscosity-temperature equation, obtain the gasification temperature range of the coal type to be processed.

4. The method for guiding the purchase of new coal for a coal gasifier using digital twins as claimed in claim 3, characterized in that: The calculation formula for the percentage content of the coal ash is: Where, m represents the coal ash viscosity correlation coefficient; Al2O3 represents the chemical composition percentage % of Al2O3 in the coal ash; SiO2 represents the chemical composition percentage % of SiO2 in the coal ash; Fe2O3 represents the chemical composition percentage % of Fe2O3 in the coal ash; CaO represents the chemical composition percentage % of CaO in the coal ash; MgO represents the chemical composition percentage % of MgO in the coal ash; When 0.788 < m < 0.835, the viscosity-temperature expression is: lgη=12629 / T-5.05m -1.89 -0.03 Where, η represents the viscosity of the coal ash; T represents the temperature of the coal ash; When m ≤ 0.788 or m ≥ 0.835, the viscosity-temperature expression is: When T≥T0, lgη=12629 / T-5.05k -1.89 -0.03 When T ≤ T0, lgη = (0.086m - 0.107)(T - T0) + lgη0 Where, T0 represents the critical temperature of the coal ash; η0 represents the critical viscosity of the coal ash.

5. The method for guiding the purchase of new coal for a coal gasifier using digital twins as claimed in claim 4, characterized in that: The expression for the critical viscosity of the coal ash is: lgη0=12629 / T0-5.05k -1.89 -0.03 Where, η0 represents the critical viscosity of the coal ash; T0 represents the critical temperature of coal ash, T0 = 341.4 + 1008.7n - 282.9n 2 +25.1n 3 , n represents the temperature proportionality coefficient; k represents the viscosity proportionality coefficient, and the expression of k is: Determine the new coal type based on blending coal trial burning.

6. The method for guiding the purchase of new coal for a coal gasifier using digital twins as claimed in claim 1, characterized in that: The adjustment range of the oxygen-coal ratio is: 0.6 - 1.

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7. The method for guiding the purchase of new coal for a coal gasifier using digital twins as claimed in claim 1, characterized in that: The adjustment range of the water-coal ratio is: 0.05 - 0.

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8. The method for guiding the purchase of new coal for a coal gasifier using digital twins as claimed in claim 1, characterized in that: The formula for the economic benefit is: Economic benefit = specific coal consumption * coal price + specific oxygen consumption * oxygen price.

9. A system for guiding the purchase of new coal for a coal gasifier using digital twins, characterized in that: The system includes: A basic physical property determination module that determines the basic physical properties of the coal type to be processed; A gasification temperature range determination module that obtains the gasification temperature range of the coal type to be processed through the viscosity-temperature equation based on the basic physical properties of the coal type to be processed; The optimization module takes economic efficiency as the objective function and the gasification temperature range as the constraint condition. It relies on process simulation software, takes the water-coal ratio and oxygen-coal ratio as adjustment parameters, and uses a linear approximation algorithm to determine the water-coal ratio and oxygen-coal ratio when the objective function is optimal, so as to determine the optimal new coal type.

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