Method, system, storage medium and device for determining sulfur trioxide concentration in flue gas of coal-fired power plant boiler

Abstract

This invention provides a method, system, storage medium, and device for determining the sulfur trioxide concentration in flue gas from a coal-fired power plant boiler. The method includes: acquiring the amount of flue gas generated by coal combustion in a target coal-fired power plant boiler and the SO2 content in the flue gas before SO2 to SO3 conversion; acquiring a calculation model for the SO2 to SO3 conversion rate during coal combustion oxidation, thereby determining the SO2 to SO3 conversion rate and the SO3 and SO2 content in the flue gas during the coal combustion oxidation process; acquiring a calculation model for the SO2 to SO3 conversion rate during denitrification catalytic oxidation, thereby determining the SO2 to SO3 conversion rate and the SO3 content generated during the denitrification catalytic oxidation process in each SCR reactor; and determining the SO3 content in the denitrification outlet flue gas of each SCR reactor based on the SO3 content in the flue gas generated by coal combustion and the SO3 content generated during the denitrification catalytic oxidation process in each SCR reactor.

Description

Technical Field

[0001] This invention relates to a method, system, storage medium, and device for determining the sulfur trioxide concentration in flue gas from a coal-fired power plant boiler. Background Technology

[0002] SO3 in the flue gas of coal-fired power plants is a byproduct of the combustion of sulfur in coal. Its sources are mainly divided into two steps: (1) sulfur elements such as pyrite in coal are oxidized into SO2, and a small part of SO2 is further oxidized into SO3 under excess oxygen; (2) when the flue gas flows through the catalyst layer of the SCR denitrification reactor, some of the SO2 in the flue gas is catalytically oxidized into SO3 by substances such as V2O5 in the denitrification catalyst layer. SO3 in the flue gas after the denitrification reactor will combine with the excess ammonia to form ammonium bisulfate, which adheres to the downstream air preheater and dust collector, causing blockage and corrosion of these devices and affecting the safe operation of the equipment. At the same time, although SO3 in the flue gas will be removed quantitatively in the subsequent dust collector and desulfurization tower, a large amount of SO3 will still be emitted into the atmosphere with the flue gas to form sulfate and other particles and become an important precursor of PM2.5, which will cause significant harm to human health, buildings and manufacturing.

[0003] Current SO3 content detection methods require on-site flue gas sampling and laboratory measurement according to the methods recommended by EPA-method 8A or the power industry standard DL / T1990-2019 "Test Method for SO3 in Flue Gas of Thermal Power Plants - Controlled Condensation Method". There are no commercially available online sampling and testing equipment or methods. Furthermore, the methods in the aforementioned standards require bringing the collected samples back to the laboratory for analysis, resulting in poor timeliness and weak correlation with operating parameters. Therefore, they cannot provide real-time information on the SO3 concentration in the flue gas or the SO2 / SO3 conversion rate during the combustion and denitrification catalytic stages. Therefore, establishing a method for real-time quantitative determination of SO3 content generated by coal-fired power plants would help in real-time monitoring of SO3 content in flue gas, assessing its impact on downstream equipment, and facilitating the analysis of operating parameters that significantly affect SO3 content, thereby guiding unit operation. Summary of the Invention

[0004] The purpose of this invention is to provide a combustion method, system, storage medium, and device capable of determining the sulfur trioxide concentration in flue gas from coal-fired power plant boilers in real time.

[0005] To achieve the above objectives, the present invention provides the following four technical solutions.

[0006] In a first aspect, the present invention provides a method for determining the sulfur trioxide concentration in flue gas from a coal-fired power plant boiler, wherein the method includes:

[0007] Obtain the amount of flue gas produced by coal combustion in the boiler of the target coal-fired power plant and the SO2 content in the flue gas produced by coal combustion in the boiler of the target coal-fired power plant before the conversion of SO2 to SO3 occurs;

[0008] A calculation model for the conversion rate of SO2 to SO3 during the oxidation process of coal combustion is obtained. This model is a calculation model for the conversion rate of SO2 to SO3 during the oxidation process of coal combustion with respect to the SO2 content. Based on the calculation model for the conversion rate of SO2 to SO3 during the oxidation process of coal combustion, combined with the SO2 content in the flue gas produced by the target coal-fired power plant boiler before the SO2 to SO3 conversion occurs, the conversion rate of SO2 to SO3 during the oxidation process of coal combustion in the target coal-fired power plant boiler is determined. Based on the conversion rate of SO2 to SO3 during the oxidation process of coal combustion in the target coal-fired power plant boiler, combined with the SO2 content in the flue gas produced by the target coal-fired power plant boiler before the SO2 to SO3 conversion occurs, the SO3 content and SO2 content in the flue gas produced by the target coal-fired power plant boiler are determined.

[0009] Based on the amount of flue gas generated by coal combustion in the target coal-fired power plant boiler, determine the amount of denitrification flue gas in each SCR reactor of the target coal-fired power plant boiler;

[0010] A calculation model for the SO2 to SO3 conversion rate during the denitrification catalytic oxidation process was developed. This model calculates the SO2 to SO3 conversion rate during the denitrification catalytic oxidation process based on the denitrification inlet flue gas temperature, denitrification catalyst composition parameters, denitrification catalyst activity coefficient, SO2 content in the flue gas generated from coal combustion, denitrification flue gas volume, and total geometric surface area of ​​the denitrification catalyst. Based on this calculation model, combined with the SO2 content in the flue gas generated from coal combustion in the target coal-fired power plant boiler and the denitrification flue gas volume of each SCR reactor in the target coal-fired power plant boiler, the SO2 to SO3 conversion rate during the denitrification catalytic oxidation process in each SCR reactor of the target coal-fired power plant boiler was determined. Finally, based on the SO2 to SO3 conversion rate during the denitrification catalytic oxidation process in each SCR reactor of the target coal-fired power plant boiler, combined with the SO2 content in the flue gas generated from coal combustion in the target coal-fired power plant boiler, the SO3 content generated during the denitrification catalytic oxidation process in each SCR reactor of the target coal-fired power plant boiler was determined.

[0011] Based on the SO3 content in the flue gas generated by coal combustion in the target coal-fired power plant boiler and the SO3 content generated during the denitrification catalytic oxidation process in each SCR reactor of the target coal-fired power plant boiler, the SO3 content in the denitrification outlet flue gas of each SCR reactor of the target coal-fired power plant boiler is determined, thereby completing the determination of the sulfur trioxide concentration in the flue gas of the coal-fired power plant boiler.

[0012] Secondly, the present invention provides a system for determining the sulfur trioxide concentration in flue gas from a coal-fired power plant boiler, the system comprising:

[0013] The first module is used to obtain the amount of flue gas produced by the combustion of coal in the boiler of the target coal-fired power plant and the SO2 content in the flue gas produced by the combustion of coal in the boiler of the target coal-fired power plant before the conversion of SO2 to SO3 occurs;

[0014] The second module is used to obtain a calculation model for the conversion rate of SO2 to SO3 during the coal combustion oxidation process. This model is a calculation model for the conversion rate of SO2 to SO3 during the coal combustion oxidation process with respect to the SO2 content. Based on the calculation model for the conversion rate of SO2 to SO3 during the coal combustion oxidation process, combined with the SO2 content in the flue gas produced by the coal combustion of the target coal-fired power plant boiler before the SO2 to SO3 conversion occurs, the conversion rate of SO2 to SO3 during the coal combustion oxidation process of the target coal-fired power plant boiler is determined. Based on the conversion rate of SO2 to SO3 during the coal combustion oxidation process of the target coal-fired power plant boiler, combined with the SO2 content in the flue gas produced by the coal combustion of the target coal-fired power plant boiler before the SO2 to SO3 conversion occurs, the SO3 content and SO2 content in the flue gas produced by the coal combustion of the target coal-fired power plant boiler are determined.

[0015] The third module is used to determine the amount of denitrification flue gas in each SCR reactor of the target coal-fired power plant boiler based on the amount of flue gas generated by coal combustion in the target coal-fired power plant boiler.

[0016] The fourth module is used to obtain a calculation model for the SO2 to SO3 conversion rate during the denitrification catalytic oxidation process. This model is a calculation model for the SO2 to SO3 conversion rate during the denitrification catalytic oxidation process with respect to the denitrification inlet flue gas temperature, denitrification catalyst composition parameters, denitrification catalyst activity coefficient, SO2 content in the flue gas generated by coal combustion, denitrification flue gas volume, and total geometric surface area of ​​the denitrification catalyst. Based on the calculation model for the SO2 to SO3 conversion rate during the denitrification catalytic oxidation process, combined with the SO2 content in the flue gas generated by coal combustion in the target coal-fired power plant boiler and the denitrification flue gas volume of each SCR reactor in the target coal-fired power plant boiler, the SO2 to SO3 conversion rate during the denitrification catalytic oxidation process in each SCR reactor of the target coal-fired power plant boiler is determined. Based on the SO2 to SO3 conversion rate during the denitrification catalytic oxidation process in each SCR reactor of the target coal-fired power plant boiler, combined with the SO2 content in the flue gas generated by coal combustion in the target coal-fired power plant boiler, the SO3 content generated during the denitrification catalytic oxidation process in each SCR reactor of the target coal-fired power plant boiler is determined.

[0017] The fifth module is used to determine the SO3 content in the flue gas from the denitrification outlet of each SCR reactor in the target coal-fired power plant boiler, based on the SO3 content in the flue gas generated by coal combustion in the target coal-fired power plant boiler and the SO3 content generated during the denitrification catalytic oxidation process in each SCR reactor of the target coal-fired power plant boiler, thereby completing the determination of the sulfur trioxide concentration in the flue gas of the coal-fired power plant boiler.

[0018] Thirdly, the present invention provides a storage medium storing one or more programs, which can be executed by one or more processors to implement the above-mentioned method for determining the sulfur trioxide concentration in flue gas from coal-fired power plant boilers.

[0019] Fourthly, the present invention provides an apparatus suitable for performing the above-described method for determining the sulfur trioxide concentration in flue gas from coal-fired power plant boilers, the apparatus comprising:

[0020] The invention comprises a processor, a communication interface, a memory, and a communication bus. The processor, communication interface, and memory communicate with each other via the communication bus. The memory stores computer programs. When the processor executes the program stored in the memory, it implements the method for determining the sulfur trioxide concentration in flue gas from a coal-fired power plant boiler provided by this invention.

[0021] Compared with existing technologies, this invention can realize the real-time determination of the SO2 to SO3 conversion rate and the SO3 content in the final flue gas during boiler combustion and denitrification catalytic conversion, and guide the safe operation of denitrification ammonia injection and air preheater in coal-fired units. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0023] By analyzing real-time operating parameters of coal-fired power plants, coal quality testing data, and the relationship between catalyst inherent parameters and SO2 and SO3, the inventors identified key factors in the oxidation of SO2 to SO3 during coal combustion and in the denitrification catalysis process. Based on this analysis, they proposed a method for determining the sulfur trioxide concentration in flue gas from coal-fired power plant boilers, which determines the SO2 / SO3 conversion rate during combustion and the SO3 concentration during denitrification catalysis. 2 / The SO3 conversion rate is used to determine the SO3 content in the boiler flue gas. The method for determining sulfur trioxide concentration in boiler flue gas of coal-fired power plants provided by this invention can obtain the SO2 and SO3 contents at the denitrification inlet and outlet, guiding the safe operation of ammonia injection and air preheater in coal-fired units.

[0024] An embodiment of the present invention provides a method for determining the sulfur trioxide concentration in flue gas from a coal-fired power plant boiler, wherein the method includes:

[0025] Step S1: Obtain the amount of flue gas produced by coal combustion in the target coal-fired power plant boiler and the SO2 content in the flue gas produced by coal combustion in the target coal-fired power plant boiler before the conversion of SO2 to SO3 occurs;

[0026] Step S2: Obtain the calculation model for the conversion rate of SO2 to SO3 during the coal combustion oxidation process. This model is a calculation model for the conversion rate of SO2 to SO3 during the coal combustion oxidation process with respect to the SO2 content. Based on the calculation model for the conversion rate of SO2 to SO3 during the coal combustion oxidation process, combined with the SO2 content in the flue gas produced by the coal combustion of the target coal-fired power plant boiler before the SO2 to SO3 conversion occurs, determine the conversion rate of SO2 to SO3 during the coal combustion oxidation process of the target coal-fired power plant boiler. Based on the conversion rate of SO2 to SO3 during the coal combustion oxidation process of the target coal-fired power plant boiler, combined with the SO2 content in the flue gas produced by the coal combustion of the target coal-fired power plant boiler before the SO2 to SO3 conversion occurs, determine the SO3 content and SO2 content in the flue gas produced by the coal combustion of the target coal-fired power plant boiler.

[0027] Step S3: Based on the amount of flue gas generated by coal combustion in the target coal-fired power plant boiler, determine the amount of denitrification flue gas in each SCR reactor of the target coal-fired power plant boiler;

[0028] Step S4: Obtain the calculation model for the SO2 to SO3 conversion rate during the denitrification catalytic oxidation process. This model is a calculation model for the SO2 to SO3 conversion rate during the denitrification catalytic oxidation process with respect to the denitrification inlet flue gas temperature, denitrification catalyst composition parameters, denitrification catalyst activity coefficient, SO2 content in the flue gas generated by coal combustion, denitrification flue gas volume, and total geometric surface area of ​​the denitrification catalyst. Based on the calculation model for the SO2 to SO3 conversion rate during the denitrification catalytic oxidation process, combined with the SO2 content in the flue gas generated by coal combustion in the target coal-fired power plant boiler and the denitrification flue gas volume of each SCR reactor in the target coal-fired power plant boiler, determine the SO2 to SO3 conversion rate during the denitrification catalytic oxidation process in each SCR reactor of the target coal-fired power plant boiler. Based on the SO2 to SO3 conversion rate during the denitrification catalytic oxidation process in each SCR reactor of the target coal-fired power plant boiler, combined with the SO2 content in the flue gas generated by coal combustion in the target coal-fired power plant boiler, determine the SO3 content generated during the denitrification catalytic oxidation process in each SCR reactor of the target coal-fired power plant boiler.

[0029] Step S5: Based on the SO3 content in the flue gas generated by coal combustion in the target coal-fired power plant boiler and the SO3 content generated during the denitrification catalytic oxidation process in each SCR reactor of the target coal-fired power plant boiler, determine the SO3 content in the denitrification outlet flue gas of each SCR reactor of the target coal-fired power plant boiler, thereby completing the determination of the sulfur trioxide concentration in the flue gas of the coal-fired power plant boiler.

[0030] Further, step S1, obtaining the amount of flue gas generated by coal combustion in the target coal-fired power plant boiler and the SO2 content in the flue gas generated by coal combustion in the target coal-fired power plant boiler before the conversion of SO2 to SO3 occurs, includes:

[0031] Step S11: Obtain coal quality data and real-time operating parameters of the target coal-fired power plant boiler;

[0032] Step S12: Based on the coal quality data of the target coal-fired power plant boiler and the real-time operating parameters of the target coal-fired power plant boiler, determine the standard dry flue gas volume generated by the coal combustion of the target coal-fired power plant boiler, and use it as the flue gas volume generated by the coal combustion of the target coal-fired power plant boiler.

[0033] Step S13: Based on the standard dry flue gas volume generated by the coal combustion of the target coal-fired power plant boiler, the coal quality data of the target coal-fired power plant boiler, and the real-time operating parameters of the target coal-fired power plant boiler, determine the SO2 content in the standard dry flue gas generated by the coal combustion of the target coal-fired power plant boiler before the SO2 to SO3 conversion occurs, and use it as the SO2 content in the flue gas generated by the coal combustion of the target coal-fired power plant boiler before the SO2 to SO3 conversion occurs;

[0034] In step S12, the standard dry flue gas volume generated by coal combustion in the target coal-fired power plant boiler can be determined by the following formula:

[0035] in,

[0036]

[0037] V0 = 0.0889 × (C ar +0.375×S ar )+0.265×H ar -0.0333×O ar

[0038] In the formula, C ar The carbon content of the coal received is expressed as a percentage (%). Data can be obtained from routine coal quality testing at power plants. (H) ar The hydrogen content received from the coal is expressed as a percentage (%), and the data can be obtained from routine coal quality testing at the power plant; N ar The nitrogen content is based on the received nitrogen content of the coal, expressed as a percentage. Data can be obtained from routine coal quality testing at power plants. ar Total sulfur content of coal as received, expressed as a percentage. Data can be obtained from routine coal quality testing at power plants; O ar The oxygen content received from the coal is expressed as a percentage (%), and this data can be obtained from routine coal quality testing at the power plant; m is the coal consumption rate, expressed in t / h, which can be obtained from real-time data on the unit's DCS dashboard; V0 is the theoretical air consumption, expressed in m³ / h. 3 / kg; The standard dry flue gas volume coefficient is expressed in meters.3 / kg; Q0 is the standard dry flue gas volume produced by coal combustion (i.e., the amount of flue gas produced by coal combustion), in m³. 3 / h (standard conditions, dry basis, 6% oxygen content); The oxygen content at the denitrification inlet is expressed as a percentage. It can be obtained from real-time data on the DCS panel of the unit. When there are multiple measuring points, the average value can be taken.

[0039] In step S13, the SO2 content in the standard dry flue gas produced by the combustion of coal in the target coal-fired power plant boiler before the conversion of SO2 to SO3 occurs can be determined by the following formula:

[0040]

[0041] In the formula, S ar Total sulfur content of coal as received, expressed as a percentage. Data can be obtained from routine coal quality testing at power plants; O ar The oxygen content of the coal is expressed as a percentage (%), which can be obtained from routine coal quality testing at the power plant; m is the coal consumption rate, expressed in t / h, which can be obtained from real-time data on the unit's DCS dashboard; Q0 is the amount of flue gas produced by coal combustion, expressed in m³ / h. 3 / h; The oxygen content at the denitrification inlet is expressed as a percentage. It can be obtained from real-time data on the DCS panel of the unit. When there are multiple measuring points, the average value can be taken. The SO2 content in the standard dry flue gas produced by coal combustion before the SO2 to SO3 conversion occurs (i.e., the SO2 content in the flue gas produced by coal combustion), in mg / m³. 3 (Standard condition, dry basis, 6% oxygen content).

[0042] Furthermore, in step S2, the calculation model for the conversion rate of SO2 to SO3 during the coal combustion oxidation process with respect to the SO2 content is as follows:

[0043]

[0044] In the formula, η 燃烧 The conversion rate of SO2 to SO3 during the oxidation process of coal combustion is expressed as a percentage (%). The SO2 content in the flue gas produced by coal combustion before the conversion of SO2 to SO3 occurs is expressed in mg / m³. 3 A is a coefficient that can be determined through data fitting; in a specific embodiment, A is 1.73662.

[0045] Furthermore, in step S2, the SO3 content in the flue gas produced by coal combustion in the target coal-fired power plant boiler is determined by the following formula:

[0046]

[0047] In the formula, SO3 content in flue gas produced by coal combustion, in mg / m³ 3 ; The SO2 content in the flue gas produced by coal combustion before the conversion of SO2 to SO3 occurs is expressed in mg / m³. 3 η 燃烧 The conversion rate of SO2 to SO3 during the oxidation process of coal combustion is expressed as a percentage (%).

[0048] Furthermore, in step S2, the SO2 content in the flue gas produced by coal combustion in the target coal-fired power plant boiler is determined by the following formula:

[0049]

[0050] In the formula, SO2 content in flue gas produced by coal combustion, in mg / m³ 3 ; The SO2 content in the flue gas produced by coal combustion before the conversion of SO2 to SO3 occurs is expressed in mg / m³. 3 η 燃烧 The conversion rate of SO2 to SO3 during the oxidation process of coal combustion is expressed as a percentage (%).

[0051] Furthermore, in step S3, the amount of denitrification flue gas in each SCR reactor of the target coal-fired power plant boiler is determined by the following formula:

[0052]

[0053] In the formula, Q i The denitrification flue gas volume of the i-th SCR reactor, in m³. 3 / h; Q0 is the amount of flue gas produced by coal combustion, in m³ / h. 3 / h;ΔP i The operating differential pressure value of the i-th SCR reactor, in Pa, can be obtained from real-time data of the DCS on the unit's dashboard; n is the total number of SCR reactors, in Pa.

[0054] For example, when the target coal-fired power plant boiler has 1 SCR reactor, Q1 = Q0

[0055] For example, when the target coal-fired power plant boiler has 2 SCR reactors,

[0056] Furthermore, in step S4, the calculation model for the conversion rate of SO2 to SO3 during the denitrification catalytic oxidation process is as follows:

[0057]

[0058] In the formula, η i脱硝 Q represents the conversion rate of SO2 to SO3 during the denitrification catalytic oxidation process in the i-th SCR reactor, expressed as a percentage (%). i The denitrification flue gas volume of the i-th SCR reactor, in m³. 3 / h;T i脱硝入口 The temperature of the flue gas at the denitrification inlet of the i-th SCR reactor is in °C and can be obtained from real-time operating data on the DCS panel. SO2 content in flue gas produced by coal combustion, in mg / m³ 3 S i The total geometric surface area of ​​the denitrification catalyst in the i-th SCR reactor, in m². 2 Performance data can come from catalyst suppliers or power plant testing data; i (t i ) represents the activity coefficient of the denitrification catalyst in the i-th SCR reactor as a function of hours of use. The unit is dimensionless and can be obtained from the activity coefficient versus time curve provided by the catalyst supplier or from actual testing and analysis at the power plant; C ik K represents the content of the k-th active component in the denitrification catalyst of the i-th SCR reactor, expressed as a percentage (%). This content can be derived from performance data provided by the catalyst supplier or power plant testing data. i This represents the total number of active components in the denitrification catalyst of the i-th SCR reactor, in dimensionless units. This number can be derived from performance data provided by the catalyst supplier or power plant testing data; B1, B2, B3, B4, B5, D k The coefficients can be determined through data fitting;

[0059] In one specific embodiment, B1, B2, B3, B4, and B5 are -0.79943, 0.00227, -1.30068, -0.00299, and 0.80849, respectively.

[0060] In one specific embodiment, the active components of the denitrification catalyst are V2O5, WO3, and MoO3, with coefficients corresponding to the content of V2O5 being 0.02062, the content of WO3 being 0.00627, and the content of MoO3 being -0.00942.

[0061] Furthermore, in step S4, the SO3 content generated during the denitrification catalytic oxidation process in each SCR reactor of the target coal-fired power plant boiler is determined by the following formula:

[0062]

[0063] In the formula, The SO3 content generated during the denitrification catalytic oxidation process in the i-th SCR reactor is expressed in mg / m³.3 ; SO2 content in flue gas produced by coal combustion, in mg / m³ 3 η i脱硝 The conversion rate of SO2 to SO3 during the denitrification catalytic oxidation process in the i-th SCR reactor is expressed as %.

[0064] Furthermore, in step S5, the SO3 content in the flue gas at the denitrification outlet of each SCR reactor in the target coal-fired power plant boiler is determined by the following formula:

[0065]

[0066] In the formula, The SO3 content generated during the denitrification catalytic oxidation process in the i-th SCR reactor is expressed in mg / m³. 3 ; SO2 content in flue gas produced by coal combustion, in mg / m³ 3 ; The SO3 content in the nitrate outlet flue gas of the i-th SCR reactor, in percent.

[0067] An embodiment of the present invention provides a system for determining the sulfur trioxide concentration in flue gas from a coal-fired power plant boiler. This system can implement the method for determining the sulfur trioxide concentration in flue gas from a coal-fired power plant boiler provided in the above embodiment. The system includes:

[0068] Module 21: Used to obtain the amount of flue gas produced by coal combustion in the target coal-fired power plant boiler and the SO2 content in the flue gas produced by coal combustion in the target coal-fired power plant boiler before the conversion of SO2 to SO3 occurs;

[0069] Module 22: Used to obtain a calculation model for the conversion rate of SO2 to SO3 during the coal combustion oxidation process. This model is a calculation model for the conversion rate of SO2 to SO3 during the coal combustion oxidation process with respect to the SO2 content. Based on the calculation model for the conversion rate of SO2 to SO3 during the coal combustion oxidation process, combined with the SO2 content in the flue gas produced by the coal combustion of the target coal-fired power plant boiler before the SO2 to SO3 conversion occurs, the conversion rate of SO2 to SO3 during the coal combustion oxidation process of the target coal-fired power plant boiler is determined. Based on the conversion rate of SO2 to SO3 during the coal combustion oxidation process of the target coal-fired power plant boiler, combined with the SO2 content in the flue gas produced by the coal combustion of the target coal-fired power plant boiler before the SO2 to SO3 conversion occurs, the SO3 content and SO2 content in the flue gas produced by the coal combustion of the target coal-fired power plant boiler are determined.

[0070] Module 3.23: Used to determine the amount of denitrification flue gas in each SCR reactor of the target coal-fired power plant boiler based on the amount of flue gas generated by coal combustion in the target coal-fired power plant boiler;

[0071] Module 4.24: This module is used to obtain a calculation model for the SO2 to SO3 conversion rate during the denitrification catalytic oxidation process. This model calculates the SO2 to SO3 conversion rate during the denitrification catalytic oxidation process based on the denitrification inlet flue gas temperature, denitrification catalyst composition parameters, denitrification catalyst activity coefficient, SO2 content in the flue gas generated from coal combustion, denitrification flue gas volume, and the total geometric surface area of ​​the denitrification catalyst. Based on this calculation model, combined with the SO2 content in the flue gas generated from coal combustion in the target coal-fired power plant boiler and the denitrification flue gas volume of each SCR reactor in the target coal-fired power plant boiler, the SO2 to SO3 conversion rate during the denitrification catalytic oxidation process in each SCR reactor of the target coal-fired power plant boiler is determined. Finally, based on the SO2 to SO3 conversion rate during the denitrification catalytic oxidation process in each SCR reactor of the target coal-fired power plant boiler, combined with the SO2 content in the flue gas generated from coal combustion in the target coal-fired power plant boiler, the SO3 content generated during the denitrification catalytic oxidation process in each SCR reactor of the target coal-fired power plant boiler is determined.

[0072] Module 5.25: Based on the SO3 content in the flue gas generated by coal combustion in the target coal-fired power plant boiler and the SO3 content generated during the denitrification catalytic oxidation process in each SCR reactor of the target coal-fired power plant boiler, determine the SO3 content in the denitrification outlet flue gas of each SCR reactor of the target coal-fired power plant boiler, thereby completing the determination of the sulfur trioxide concentration in the flue gas of the coal-fired power plant boiler.

[0073] Furthermore, the first module 21 includes:

[0074] Basic data acquisition submodule 211: used to acquire coal quality data and real-time operating parameters of the target coal-fired power plant boiler;

[0075] Flue gas volume determination submodule 212: is used to determine the standard dry flue gas volume generated by the combustion of coal in the target coal-fired power plant boiler based on the coal quality data and real-time operating parameters of the target coal-fired power plant boiler, and use it as the flue gas volume generated by the combustion of coal in the target coal-fired power plant boiler.

[0076] The coal combustion flue gas parameter determination submodule 213 is used to determine the SO2 content in the standard dry flue gas produced by the coal combustion of the target coal-fired power plant boiler before the SO2 to SO3 conversion occurs, based on the standard dry flue gas volume produced by the coal combustion of the target coal-fired power plant boiler, the coal quality data of the target coal-fired power plant boiler, and the real-time operating parameters of the target coal-fired power plant boiler. This content is used as the SO2 content in the flue gas produced by the coal combustion of the target coal-fired power plant boiler before the SO2 to SO3 conversion occurs.

[0077] The standard dry flue gas volume generated by coal combustion in the target coal-fired power plant boiler can be determined by the following formula:

[0078] in,

[0079]

[0080] V0 = 0.0889 × (C ar +0.375×S ar )+0.265×H ar -0.0333×O ar

[0081] In the formula, C ar The carbon content of the coal received is expressed as a percentage (%). Data can be obtained from routine coal quality testing at power plants. (H) ar The hydrogen content received from the coal is expressed as a percentage (%), and the data can be obtained from routine coal quality testing at the power plant; N ar The nitrogen content is based on the received nitrogen content of the coal, expressed as a percentage. Data can be obtained from routine coal quality testing at power plants. ar Total sulfur content of coal as received, expressed as a percentage. Data can be obtained from routine coal quality testing at power plants; O ar The oxygen content received from the coal is expressed as a percentage (%), and this data can be obtained from routine coal quality testing at the power plant; m is the coal consumption rate, expressed in t / h, which can be obtained from real-time data on the unit's DCS dashboard; V0 is the theoretical air consumption, expressed in m³ / h. 3 / kg; The standard dry flue gas volume coefficient is expressed in meters. 3 / kg; Q0 is the standard dry flue gas volume produced by coal combustion (i.e., the amount of flue gas produced by coal combustion), in m³. 3 / h (standard conditions, dry basis, 6% oxygen content); The oxygen content at the denitrification inlet is expressed as a percentage. It can be obtained from real-time data on the DCS panel of the unit. When there are multiple measuring points, the average value can be taken.

[0082] The SO2 content in the standard dry flue gas produced by coal combustion in the target coal-fired power plant boiler before SO2 conversion to SO3 occurs can be determined by the following formula:

[0083]

[0084] In the formula, S ar Total sulfur content of coal as received, expressed as a percentage. Data can be obtained from routine coal quality testing at power plants; O ar The oxygen content of the coal is expressed as a percentage (%), which can be obtained from routine coal quality testing at the power plant; m is the coal consumption rate, expressed in t / h, which can be obtained from real-time data on the unit's DCS dashboard; Q0 is the amount of flue gas produced by coal combustion, expressed in m³ / h. 3 / h; The oxygen content at the denitrification inlet is expressed as a percentage. It can be obtained from real-time data on the DCS panel of the unit. When there are multiple measuring points, the average value can be taken. The SO2 content in the standard dry flue gas produced by coal combustion before the SO2 to SO3 conversion occurs (i.e., the SO2 content in the flue gas produced by coal combustion), in mg / m³. 3 (Standard condition, dry basis, 6% oxygen content).

[0085] Furthermore, the calculation model for the conversion rate of SO2 to SO3 during the coal combustion oxidation process with respect to SO2 content is as follows:

[0086]

[0087] In the formula, η 燃烧 The conversion rate of SO2 to SO3 during the oxidation process of coal combustion is expressed as a percentage (%). The SO2 content in the flue gas produced by coal combustion before the conversion of SO2 to SO3 occurs is expressed in mg / m³. 3 A is a coefficient that can be determined through data fitting; in a specific embodiment, A is 1.73662.

[0088] Furthermore, the SO3 content in the flue gas produced by coal combustion in the target coal-fired power plant boiler is determined by the following formula:

[0089]

[0090] In the formula, SO3 content in flue gas produced by coal combustion, in mg / m³ 3 ; The SO2 content in the flue gas produced by coal combustion before the conversion of SO2 to SO3 occurs is expressed in mg / m³. 3 η 燃烧 The conversion rate of SO2 to SO3 during the oxidation process of coal combustion is expressed as a percentage (%).

[0091] Furthermore, the SO2 content in the flue gas produced by coal combustion in the target coal-fired power plant boiler is determined by the following formula:

[0092]

[0093] In the formula, SO2 content in flue gas produced by coal combustion, in mg / m³ 3 ; The SO2 content in the flue gas produced by coal combustion before the conversion of SO2 to SO3 occurs is expressed in mg / m³. 3 η 燃烧 The conversion rate of SO2 to SO3 during the oxidation process of coal combustion is expressed as a percentage (%).

[0094] Furthermore, the denitrification flue gas volume of each SCR reactor in the target coal-fired power plant boiler is determined by the following formula:

[0095]

[0096] In the formula, Q i The denitrification flue gas volume of the i-th SCR reactor, in m³. 3 / h; Q0 is the amount of flue gas produced by coal combustion, in m³ / h. 3 / h;ΔP i is the operating differential pressure value of the i-th SCR reactor, in Pa, which can be obtained from real-time data of the DCS on the unit's dashboard; n is the total number of SCR reactors, in Pa.

[0097] Furthermore, the calculation model for the conversion rate of SO2 to SO3 during the denitrification catalytic oxidation process is as follows:

[0098]

[0099] In the formula, η i脱硝 Q represents the conversion rate of SO2 to SO3 during the denitrification catalytic oxidation process in the i-th SCR reactor, expressed as a percentage (%). i The denitrification flue gas volume of the i-th SCR reactor, in m³. 3 / h;T i脱硝入口 The temperature of the flue gas at the denitrification inlet of the i-th SCR reactor is in °C and can be obtained from real-time operating data on the DCS panel. SO2 content in flue gas produced by coal combustion, in mg / m³ 3 S i The total geometric surface area of ​​the denitrification catalyst in the i-th SCR reactor, in m². 2 Performance data can come from catalyst suppliers or power plant testing data; i (t i ) represents the activity coefficient of the denitrification catalyst in the i-th SCR reactor as a function of hours of use. The unit is dimensionless and can be obtained from the activity coefficient versus time curve provided by the catalyst supplier or from actual testing and analysis at the power plant; C ik K represents the content of the k-th active component in the denitrification catalyst of the i-th SCR reactor, expressed as a percentage (%). This content can be derived from performance data provided by the catalyst supplier or power plant testing data. i This represents the total number of active components in the denitrification catalyst of the i-th SCR reactor, in dimensionless units. This number can be derived from performance data provided by the catalyst supplier or power plant testing data; B1, B2, B3, B4, B5, D k The coefficients can be determined through data fitting;

[0100] In one specific embodiment, B1, B2, B3, B4, and B5 are -0.79943, 0.00227, -1.30068, -0.00299, and 0.80849, respectively.

[0101] In one specific embodiment, the active components of the denitrification catalyst are V2O5, WO3, and MoO3, with coefficients corresponding to the content of V2O5 being 0.02062, the content of WO3 being 0.00627, and the content of MoO3 being -0.00942.

[0102] Furthermore, the SO3 content generated during the denitrification catalytic oxidation process in each SCR reactor of the target coal-fired power plant boiler is determined by the following formula:

[0103]

[0104] In the formula, The SO3 content generated during the denitrification catalytic oxidation process in the i-th SCR reactor is expressed in mg / m³. 3 ; SO2 content in flue gas produced by coal combustion, in mg / m³ 3 η i脱硝 The conversion rate of SO2 to SO3 during the denitrification catalytic oxidation process in the i-th SCR reactor is expressed as %.

[0105] Furthermore, the SO3 content in the flue gas from the denitrification outlet of each SCR reactor in the target coal-fired power plant boiler is determined using the following formula:

[0106]

[0107] In the formula, The SO3 content generated during the denitrification catalytic oxidation process in the i-th SCR reactor is expressed in mg / m³. 3 ; SO2 content in flue gas produced by coal combustion, in mg / m³ 3 ; The SO3 content in the nitrate outlet flue gas of the i-th SCR reactor, in percent.

[0108] This invention also provides a storage medium. The storage medium stores one or more programs. The storage medium may include volatile memory, such as random access memory; it may also include non-volatile memory, such as read-only memory, flash memory, hard disk, or solid-state drive; and it may also include combinations of the above types of memory.

[0109] When one or more programs in the storage medium can be executed by one or more processors to implement the steps of the above-described method for determining the sulfur trioxide concentration in flue gas from a coal-fired power plant boiler, please refer to the above-described embodiment of the method for determining the sulfur trioxide concentration in flue gas from a coal-fired power plant boiler, which will not be repeated here.

[0110] One embodiment of the present invention provides a device for determining the sulfur trioxide concentration in flue gas from a coal-fired power plant boiler. The device includes: a processor communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus.

[0111] Memory, used to store computer programs;

[0112] When the processor executes the program stored in the memory to implement the steps of the method for determining the sulfur trioxide concentration in the flue gas of a coal-fired power plant boiler, the specific steps of the method are described in the embodiment of the material acoustic performance testing method, which will not be repeated here.

[0113] Example 1

[0114] This embodiment takes a 660MW coal-fired power plant boiler unit as an example. The denitrification system of this unit contains two reactors, the first and the second. The coal quality, DCS data used in the calculation, catalyst parameters provided by the manufacturer, the determined SO2 to SO3 conversion rate, and the SO3 concentration in the boiler flue gas are shown in Tables 1 and 2 below. Specifically, this embodiment determines the sulfur trioxide concentration in the flue gas using the following method for determining the sulfur trioxide concentration in coal-fired power plant boiler flue gas:

[0115] 1. Obtain coal quality data and real-time operating parameters of the target coal-fired power plant boiler; based on the coal quality data and real-time operating parameters, determine the standard dry flue gas volume generated by coal combustion in the target coal-fired power plant boiler, which is taken as the flue gas volume generated by coal combustion in the target coal-fired power plant boiler; based on the standard dry flue gas volume, coal quality data, and real-time operating parameters, determine the SO2 content in the standard dry flue gas generated by coal combustion in the target coal-fired power plant boiler before SO2 to SO3 conversion occurs, which is taken as the SO2 content in the flue gas generated by coal combustion in the target coal-fired power plant boiler before SO2 to SO3 conversion occurs;

[0116] The standard dry flue gas volume generated by coal combustion in the target coal-fired power plant boiler is determined by the following formula:

[0117] in,

[0118]

[0119] V0 = 0.0889 × (C ar +0.375×S ar )+0.265×H ar -0.0333×O ar

[0120] In the formula, C ar Carbon received from coal, in %; H ar Hydrogen obtained from coal combustion, in percentage (%); N ar Nitrogen content based on coal combustion, in %; S ar Total sulfur content of coal as received, expressed as a percentage. Data can be obtained from routine coal quality testing at power plants; O ar The oxygen content is % based on the amount of coal burned; m is the amount of coal burned (t / h); V0 is the theoretical air volume (m³). 3 / kg; The standard dry flue gas volume coefficient is expressed in meters. 3 / kg; Q0 is the standard dry flue gas volume produced by coal combustion (i.e., the amount of flue gas produced by coal combustion), in m³. 3 / h (standard conditions, dry basis, 6% oxygen content); Oxygen content at the denitrification inlet, in %;

[0121] The SO2 content in the standard dry flue gas produced by coal combustion in the target coal-fired power plant boiler before SO2 to SO3 conversion occurs is determined by the following formula:

[0122]

[0123] In the formula, S ar Total sulfur content of coal as received, in %; O ar The oxygen content is % based on the amount of coal burned; m is the amount of coal burned (t / h); Q0 is the amount of flue gas produced by coal combustion (m³). 3 / h; Oxygen content at the denitrification inlet, in %; The SO2 content in the standard dry flue gas produced by coal combustion before the SO2 to SO3 conversion occurs (i.e., the SO2 content in the flue gas produced by coal combustion), in mg / m³. 3 (Standard condition, dry basis, 6% oxygen content).

[0124] 2. Obtain a calculation model for the conversion rate of SO2 to SO3 during the coal combustion oxidation process. This model is a calculation model for the conversion rate of SO2 to SO3 during the coal combustion oxidation process with respect to the SO2 content. Based on the calculation model for the conversion rate of SO2 to SO3 during the coal combustion oxidation process, combined with the SO2 content in the flue gas produced by the target coal-fired power plant boiler before the SO2 to SO3 conversion occurs, determine the conversion rate of SO2 to SO3 during the coal combustion oxidation process of the target coal-fired power plant boiler. Based on the conversion rate of SO2 to SO3 during the coal combustion oxidation process of the target coal-fired power plant boiler, combined with the SO2 content in the flue gas produced by the target coal-fired power plant boiler before the SO2 to SO3 conversion occurs, determine the SO3 content and SO2 content in the flue gas produced by the target coal-fired power plant boiler.

[0125] The calculation model for the conversion rate of SO2 to SO3 during coal combustion oxidation with respect to SO2 content is as follows:

[0126]

[0127] In the formula, η 燃烧 The conversion rate of SO2 to SO3 during the oxidation process of coal combustion is expressed as a percentage (%). The SO2 content in the flue gas produced by coal combustion before the conversion of SO2 to SO3 occurs is expressed in mg / m³. 3 A is the coefficient;

[0128] The SO3 content in the flue gas produced by coal combustion in the target coal-fired power plant boiler is determined by the following formula:

[0129]

[0130] In the formula, SO3 content in flue gas produced by coal combustion, in mg / m³ 3 ; The SO2 content in the flue gas produced by coal combustion before the conversion of SO2 to SO3 occurs is expressed in mg / m³. 3 η 燃烧 The conversion rate of SO2 to SO3 during the oxidation process of coal combustion is expressed as a percentage (%).

[0131] The SO2 content in the flue gas produced by coal combustion in the target coal-fired power plant boiler is determined by the following formula:

[0132]

[0133] In the formula, SO2 content in flue gas produced by coal combustion, in mg / m³ 3 ; The SO2 content in the flue gas produced by coal combustion before the conversion of SO2 to SO3 occurs is expressed in mg / m³. 3 η 燃烧 The conversion rate of SO2 to SO3 during the oxidation process of coal combustion is expressed as a percentage (%).

[0134] 3. Based on the amount of flue gas generated by coal combustion in the target coal-fired power plant boiler, determine the amount of denitrification flue gas in each SCR reactor of the target coal-fired power plant boiler;

[0135] The denitrification flue gas volume of each SCR reactor in the target coal-fired power plant boiler is determined by the following formula:

[0136]

[0137] In the formula, Q1 is the amount of denitrification flue gas in the first SCR reactor, in m³. 3 / h; Q2 is the denitrification flue gas volume of the second SCR reactor, in m³ / h. 3 / h; Q0 is the amount of flue gas produced by coal combustion, in m³ / h. 3 / h; ΔP1 is the operating differential pressure value of the first SCR reactor, in Pa; ΔP2 is the operating differential pressure value of the second SCR reactor, in Pa.

[0138] 4. Obtain a calculation model for the SO2 to SO3 conversion rate during the denitrification catalytic oxidation process. This model is a calculation model for the SO2 to SO3 conversion rate during the denitrification catalytic oxidation process with respect to the denitrification inlet flue gas temperature, denitrification catalyst composition parameters, denitrification catalyst activity coefficient, SO2 content in the flue gas generated by coal combustion, denitrification flue gas volume, and total geometric surface area of ​​the denitrification catalyst. Based on the calculation model for the SO2 to SO3 conversion rate during the denitrification catalytic oxidation process, combined with the SO2 content in the flue gas generated by coal combustion in the target coal-fired power plant boiler and the denitrification flue gas volume of each SCR reactor in the target coal-fired power plant boiler, determine the SO2 to SO3 conversion rate during the denitrification catalytic oxidation process in each SCR reactor of the target coal-fired power plant boiler. Based on the SO2 to SO3 conversion rate during the denitrification catalytic oxidation process in each SCR reactor of the target coal-fired power plant boiler, combined with the SO2 content in the flue gas generated by coal combustion in the target coal-fired power plant boiler, determine the SO3 content generated during the denitrification catalytic oxidation process in each SCR reactor of the target coal-fired power plant boiler.

[0139] The calculation model for the conversion rate of SO2 to SO3 during the denitrification catalytic oxidation process is as follows:

[0140]

[0141]

[0142] In the formula, η 1脱硝Q1 represents the conversion rate of SO2 to SO3 during the denitrification catalytic oxidation process in the first SCR reactor, in percentage (%); Q1 represents the denitrification flue gas volume in the first SCR reactor, in cubic meters per second (m³). 3 / h;T 1脱硝入口 η is the inlet flue gas temperature of the first SCR reactor, in °C. 2脱硝 Q2 represents the conversion rate of SO2 to SO3 during the denitrification catalytic oxidation process in the second SCR reactor, in percentage (%); Q2 represents the denitrification flue gas volume in the second SCR reactor, in m³. 3 / h;T 2脱硝入口 The temperature of the flue gas at the inlet of the second SCR reactor for denitrification is expressed in °C. SO2 content in flue gas produced by coal combustion, in mg / m³ 3 S1 represents the total geometric surface area of ​​the denitrification catalyst in the first SCR reactor, in m². 2 f1(t1) is the activity coefficient of the denitrification catalyst in the first SCR reactor as a function of operating hours, in dimensionless units; S2 is the total geometric surface area of ​​the denitrification catalyst in the second SCR reactor, in m². 2 f2(t2) is the activity coefficient of the denitrification catalyst in the second SCR reactor as a function of hours of use, and the unit is dimensionless. The content of V2O5 active component in the denitrification catalyst of the first SCR reactor, in %; The content of V2O5 active component in the denitrification catalyst of the second SCR reactor, in %; The content of MoO3 active component in the denitrification catalyst of the first SCR reactor is expressed as %; The content of MoO3 active component in the denitrification catalyst of the second SCR reactor is expressed in %; The content of WO3 active component in the denitrification catalyst of the first SCR reactor, in %; The content of WO3 active component in the denitrification catalyst of the second SCR reactor, in %;

[0143] The SO3 content generated during the denitrification catalytic oxidation process in each SCR reactor of the target coal-fired power plant boiler is determined by the following formula:

[0144]

[0145]

[0146] In the formula, The SO3 content generated during the denitrification catalytic oxidation process in the first SCR reactor is expressed in mg / m³. 3 ; The SO3 content generated during the denitrification catalytic oxidation process in the second SCR reactor is expressed in mg / m³. 3 ; SO2 content in flue gas produced by coal combustion, in mg / m³ 3 η 1脱硝 The conversion rate of SO2 to SO3 during the denitrification catalytic oxidation process in the first SCR reactor is expressed as %; η 2脱硝 The conversion rate of SO2 to SO3 during the denitrification catalytic oxidation process in the second SCR reactor is expressed as %.

[0147] 5. Based on the SO3 content in the flue gas generated by coal combustion in the target coal-fired power plant boiler and the SO3 content generated during the denitrification catalytic oxidation process in each SCR reactor of the target coal-fired power plant boiler, determine the SO3 content in the denitrification outlet flue gas of each SCR reactor of the target coal-fired power plant boiler, thereby completing the determination of the sulfur trioxide concentration in the flue gas of the coal-fired power plant boiler.

[0148] The SO3 content in the flue gas from the denitrification outlet of each SCR reactor in the target coal-fired power plant boiler is determined by the following formula:

[0149]

[0150]

[0151] In the formula, The SO3 content generated during the denitrification catalytic oxidation process in the first SCR reactor is expressed in mg / m³. 3 ; The SO3 content generated during the denitrification catalytic oxidation process in the second SCR reactor is expressed in mg / m³. 3 ; SO2 content in flue gas produced by coal combustion, in mg / m³ 3 ; SO3 content in the nitrate outlet flue gas of the first SCR reactor, in %; The SO3 content in the nitrate outlet flue gas of the second SCR reactor is expressed as %.

[0152] Table 1. Coal quality data and SO3 content generated by combustion oxidation of the unit.

[0153]

[0154] Table 2. Unit denitrification data and SO3 content in denitrification catalytic oxidation.

[0155]

[0156]

[0157] Preferred embodiments of the invention have been described above. Many features and advantages of these embodiments are apparent from this detailed description, and therefore the claims are intended to cover all such features and advantages of these embodiments that fall within their true spirit and scope. Furthermore, since many modifications and alterations will readily occur to those skilled in the art, the embodiments of the invention are not intended to be limited to the precise structures and operations illustrated and described, but rather to encompass all suitable modifications and equivalents falling within their scope.

Claims

1. A method for determining the concentration of sulfur trioxide in flue gas from a coal-fired power plant boiler, wherein, The method comprises: obtaining the amount of flue gas generated by the combustion of coal in the target coal-fired boiler and the SO2 content in the flue gas generated by the combustion of coal in the target coal-fired boiler before SO2 conversion to SO3 occurs; obtaining a conversion rate calculation model of SO2 to SO3 in the coal combustion oxidation process, which is a calculation model of the conversion rate of SO2 to SO3 in the coal combustion oxidation process with respect to the SO2 content; based on the conversion rate calculation model of SO2 to SO3 in the coal combustion oxidation process, the SO2 content in the flue gas generated by the combustion of coal in the target coal-fired boiler before SO2 conversion to SO3 occurs is determined to determine the conversion rate of SO2 to SO3 in the coal combustion oxidation process of the target coal-fired boiler; based on the conversion rate of SO2 to SO3 in the coal combustion oxidation process of the target coal-fired boiler, the SO2 content in the flue gas generated by the combustion of coal in the target coal-fired boiler before SO2 conversion to SO3 occurs is determined to determine the SO3 content in the flue gas generated by the combustion of coal in the target coal-fired boiler and the SO2 content in the flue gas generated by the combustion of coal in the target coal-fired boiler; based on the amount of flue gas generated by the combustion of coal in the target coal-fired boiler, the denitration flue gas amount of each SCR reactor of the target coal-fired boiler is determined; obtaining a conversion rate calculation model of SO2 to SO3 in the denitration catalytic oxidation process, which is a calculation model of the conversion rate of SO2 to SO3 in the denitration catalytic oxidation process with respect to the denitration inlet flue gas temperature, the denitration catalyst composition parameter, the denitration catalyst activity coefficient, the SO2 content in the flue gas generated by the combustion of coal, the denitration flue gas amount and the total geometric surface area of the denitration catalyst; based on the conversion rate calculation model of SO2 to SO3 in the denitration catalytic oxidation process, the SO2 content in the flue gas generated by the combustion of coal in the target coal-fired boiler and the denitration flue gas amount of each SCR reactor of the target coal-fired boiler are determined to determine the conversion rate of SO2 to SO3 in the denitration catalytic oxidation process of each SCR reactor of the target coal-fired boiler; based on the conversion rate of SO2 to SO3 in the denitration catalytic oxidation process of each SCR reactor of the target coal-fired boiler, the SO2 content in the flue gas generated by the combustion of coal in the target coal-fired boiler is determined to determine the SO3 content generated in the denitration catalytic oxidation process of each SCR reactor of the target coal-fired boiler; based on the SO3 content in the flue gas generated by the combustion of coal in the target coal-fired boiler and the SO3 content generated in the denitration catalytic oxidation process of each SCR reactor of the target coal-fired boiler, the SO3 content in the denitration outlet flue gas of each SCR reactor of the target coal-fired boiler is determined, thereby completing the determination of the sulfur trioxide concentration of the flue gas of the coal-fired boiler; wherein the calculation model of the conversion rate of SO2 to SO3 in the coal combustion oxidation process with respect to the SO2 content is: wherein is the conversion rate of SO2 to SO3 in the combustion and oxidation process of coal, in %; is the SO2 content in the flue gas produced by the combustion of coal before the conversion of SO2 to SO3, in mg / m 3 ; A is a coefficient; wherein the conversion rate calculation model of SO2 to SO3 in the denitration catalytic oxidation process is: In the formula, For the first The conversion rate of SO2 to SO3 during the denitrification catalytic oxidation process in an SCR reactor, in percentage (%). For the first The amount of denitrification flue gas from each SCR reactor, in m³. 3 / h; For the first The inlet flue gas temperature of the SCR reactor for denitrification, in °C; SO2 content in flue gas produced by coal combustion, in mg / m³ 3 ; For the first Total geometric surface area of ​​the denitrification catalyst in an SCR reactor, in m² 2 ; For the first Activity coefficient of denitrification catalyst in an SCR reactor as a function of hours of use, in dimensionless units; For the first The denitrification catalyst in the SCR reactor is the first Content of each active ingredient, in % For the first The total number of active components of the denitrification catalyst in each SCR reactor, in dimensionless units; , , , , , is a coefficient.

2. The method of claim 1, wherein, obtaining the amount of flue gas generated by the combustion of coal in the target coal-fired boiler and the SO2 content in the flue gas generated by the combustion of coal in the target coal-fired boiler before SO2 conversion to SO3 occurs comprises: obtaining the coal quality data of the target coal-fired boiler and the real-time operation parameters of the target coal-fired boiler; Determine the SO2 content in the standard dry flue gas generated by the target coal-fired power plant boiler burning coal before SO2 is converted into SO3, as the SO2 content in the flue gas generated by the target coal-fired power plant boiler burning coal before SO2 is converted into SO3, based on the standard dry flue gas generated by the target coal-fired power plant boiler burning coal, the coal quality data of the target coal-fired power plant boiler, and the real-time operating parameters of the target coal-fired power plant boiler. Determine the SO2 content in the standard dry flue gas generated by the target coal-fired power plant boiler burning coal before SO2 is converted into SO3, as the SO2 content in the flue gas generated by the target coal-fired power plant boiler burning coal before SO2 is converted into SO3, based on the standard dry flue gas generated by the target coal-fired power plant boiler burning coal, the coal quality data of the target coal-fired power plant boiler, and the real-time operating parameters of the target coal-fired power plant boiler.

3. The method of claim 2, wherein, The standard dry flue gas generated by the target coal-fired power plant boiler burning coal is determined by the following formula: wherein, In the formula, C ar is the received basis carbon of coal-fired, unit %; H ar is the received basis hydrogen of coal-fired, unit %; N ar is the received basis nitrogen of coal-fired, unit %; S ar is the received basis total sulfur of coal-fired, unit %; O ar is the received basis oxygen of coal-fired, unit %; m is the amount of coal-fired, unit t / h; is the theoretical air amount, unit m 3 / kg; is the standard dry flue gas amount coefficient, unit m 3 / kg; Q0 is the standard dry flue gas amount generated by coal combustion, unit m 3 / h; is the oxygen content at the denitration inlet, unit %.

4. The method of claim 2, wherein, The SO2 content in the standard dry flue gas generated by the target coal-fired power plant boiler burning coal before SO2 is converted into SO3 is determined by the following formula: wherein S ar is the received basis full sulfur of the coal, unit %; O ar is the received basis oxygen of the coal, unit %; m is the amount of coal, unit t / h; Q0is the amount of flue gas generated by burning coal, unit m 3 / h; is the oxygen content at the denitration inlet, unit %; is the SO2 content in the standard dry flue gas generated by burning coal before SO2 conversion to SO3, unit mg / m 3 .

5. The method of claim 1, wherein, The SO3 content in the flue gas generated by the target coal-fired power plant boiler burning coal is determined by the following formula: wherein, SO3 is the content of SO3 in the flue gas generated by the combustion of coal, in mg / m3 3 ; SO2 is the content of SO2 in the flue gas generated by the combustion of coal before SO2 is converted to SO3, in mg / m3 3 ; SO2conversion is the conversion rate of SO2 to SO3 during the oxidation process of the combustion of coal, in %; The SO2 content in the flue gas generated by the target coal-fired power plant boiler burning coal is determined by the following formula: In the formula, SO2content in flue gas generated by coal combustion, unit: mg / m 3 ; SO2content in flue gas generated by coal combustion before SO2conversion to SO3, unit: mg / m 3 ; Conversion rate of SO2 to SO3 in the oxidation process of coal combustion, unit: %.

6. The method of claim 1, wherein, The denitrification flue gas quantity of each SCR reactor of the target coal-fired power plant boiler is determined by the following formula: In the formula, is the total number of SCR reactors, units Pa. is the total number of SCR reactors, units Pa. 3 is the total number of SCR reactors, units Pa. 3 is the total number of SCR reactors, units Pa. is the total number of SCR reactors, units Pa. is the total number of SCR reactors, units Pa. is the total number of SCR reactors, units Pa.

7. The method of claim 1, wherein, The SO3 content generated in the denitrification catalytic oxidation process of each SCR reactor of the target coal-fired power plant boiler is determined by the following formula: In the formula, SO3 content generated in the denitration catalytic oxidation process of the first SCR reactor, unit: mg / m 3 ; SO2 content in the flue gas generated by coal combustion, unit: mg / m 3 ; SO2 conversion rate to SO3 in the denitration catalytic oxidation process of the first SCR reactor, unit: %; The SO3 content in the denitrification outlet flue gas of each SCR reactor of the target coal-fired power plant boiler is determined by the following formula: In the formula, SO3 content generated in the denitration catalytic oxidation process of the first SCR reactor, unit: mg / m 3 ; SO2 content in the flue gas generated by coal combustion, unit: mg / m 3 ; SO3 content in the flue gas at the outlet of the first SCR reactor, unit: mg / m 3 .

8. A system for determining the concentration of sulfur trioxide in flue gas from a coal-fired power plant boiler, wherein, The system comprises: A first module for obtaining the flue gas quantity generated by the target coal-fired power plant boiler burning coal and the SO2 content in the flue gas generated by the target coal-fired power plant boiler burning coal before SO2 is converted into SO3; A second module for obtaining a conversion rate calculation model of SO2 to SO3 in the coal combustion oxidation process, which is a calculation model of the conversion rate of SO2 to SO3 in the coal combustion oxidation process with respect to the SO2 content; determine the conversion rate of SO2 to SO3 in the coal combustion oxidation process of the target coal-fired power plant boiler based on the conversion rate calculation model of SO2 to SO3 in the coal combustion oxidation process combined with the SO2 content in the flue gas generated by the target coal-fired power plant boiler burning coal before SO2 is converted into SO3; determine the SO3 content in the flue gas generated by the target coal-fired power plant boiler burning coal and the SO2 content in the flue gas generated by the target coal-fired power plant boiler burning coal based on the conversion rate of SO2 to SO3 in the coal combustion oxidation process of the target coal-fired power plant boiler combined with the SO2 content in the flue gas generated by the target coal-fired power plant boiler burning coal before SO2 is converted into SO3; A third module for determining the denitrification flue gas quantity of each SCR reactor of the target coal-fired power plant boiler based on the flue gas quantity generated by the target coal-fired power plant boiler burning coal; The fourth module is used for obtaining a conversion rate calculation model of SO2 to SO3 in the denitration catalytic oxidation process. The model is a calculation model of the conversion rate of SO2 to SO3 in the denitration catalytic oxidation process with respect to the denitration inlet flue gas temperature, the denitration catalyst composition parameter, the denitration catalyst activity coefficient, the SO2 content in the flue gas generated by the coal combustion, the denitration flue gas volume and the total geometric surface area of the denitration catalyst. Based on the conversion rate calculation model of SO2 to SO3 in the denitration catalytic oxidation process, the SO2 content in the flue gas generated by the coal combustion of the target coal-fired power plant boiler and the denitration flue gas volume of each SCR reactor of the target coal-fired power plant boiler, the conversion rate of SO2 to SO3 in the denitration catalytic oxidation process of each SCR reactor of the target coal-fired power plant boiler is determined. Based on the conversion rate of SO2 to SO3 in the denitration catalytic oxidation process of each SCR reactor of the target coal-fired power plant boiler and the SO2 content in the flue gas generated by the coal combustion of the target coal-fired power plant boiler, the SO3 content generated in the denitration catalytic oxidation process of each SCR reactor of the target coal-fired power plant boiler is determined. The fifth module is used for determining the SO3 content in the denitration outlet flue gas of each SCR reactor of the target coal-fired power plant boiler based on the SO3 content in the flue gas generated by the coal combustion of the target coal-fired power plant boiler and the SO3 content generated in the denitration catalytic oxidation process of each SCR reactor of the target coal-fired power plant boiler, so as to complete the determination of the sulfur trioxide concentration in the flue gas of the coal-fired power plant boiler. The conversion rate calculation model of SO2 to SO3 in the denitration catalytic oxidation process is as follows: wherein is the conversion rate of SO2 to SO3 in the combustion and oxidation process of coal, in %; is the SO2 content in the flue gas produced by the combustion of coal before the conversion of SO2 to SO3, in mg / m 3 ; A is a coefficient; The storage medium stores one or more programs, which can be executed by one or more processors to implement the method for determining the sulfur trioxide concentration in the flue gas of the coal-fired power plant boiler in any one of claims 1-7. In the formula, For the first The conversion rate of SO2 to SO3 during the denitrification catalytic oxidation process in an SCR reactor, in percentage (%). For the first The amount of denitrification flue gas from each SCR reactor, in m³. 3 / h; For the first The inlet flue gas temperature of the SCR reactor for denitrification, in °C; SO2 content in flue gas produced by coal combustion, in mg / m³ 3 ; For the first Total geometric surface area of ​​the denitrification catalyst in an SCR reactor, in m² 2 ; For the first Activity coefficient of denitrification catalyst in an SCR reactor as a function of hours of use, in dimensionless units; For the first The denitrification catalyst in the SCR reactor is the first Content of each active ingredient, in % For the first The total number of active components of the denitrification catalyst in each SCR reactor, in dimensionless units; , , , , , is a coefficient.

9. A storage medium, wherein, The processor, the communication interface, the memory and the communication bus complete the communication among each other through the communication bus; 10. A device for determining the concentration of sulfur trioxide in flue gas from a coal-fired power plant boiler, the device comprising: The memory is used for storing the computer program; The processor is used for executing the program stored on the memory, so as to implement the method for determining the sulfur trioxide concentration in the flue gas of the coal-fired power plant boiler in any one of claims 1-7. ​

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