A method, system, device and medium for material balance design of an SCR denitration system

Abstract

The present application relates to the technical field of SCR denitration, and discloses a method, system, equipment and medium for material balance design of a coal-fired power plant mixed-burning sludge SCR denitration system; wherein, the method assumes the oxygen content and dry flue gas volume in the imported flue gas as the preset oxygen content and dry flue gas volume in the exported flue gas, and converts the pollutant removal efficiency into the actual volume of the pollutant under standard state; according to the chemical reaction in the SCR denitration process, the change amount of the pollutant and ammonia gas mixture and other materials is calculated; the change of the composition of the imported and exported flue gas of the system is summarized, and the parameters of each component in the exported flue gas of the system are obtained therefrom, which are compared with the preset oxygen content and dry flue gas volume in the exported flue gas; when the comparison error obtained satisfies the preset requirement, the material calculation result is summarized. The present application solves the phenomenon that the concentration of the imported and exported materials and the change of the flue gas composition are lacking in the measurement of the data of the SCR denitration system, and provides guidance for the on-site optimized operation and performance evaluation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of SCR denitration, in particular to a method for designing material balance of an SCR denitration system after coal-fired power plants burn sludge. BACKGROUND

[0002] After coal-fired power plants burn sludge, it is very important to calculate the material balance of the SCR denitration system, which can predict and analyze the influence of burning sludge on the operation of the SCR denitration system. At present, there is a lack of a method for calculating the material balance of the SCR denitration system of coal-fired power plants after burning sludge. Due to the lack of the relevant method for calculating the material balance, the change rules of the material concentration at the inlet and outlet of the SCR denitration system and the composition of flue gas cannot be obtained on site, and the measurement of the SCR system on site is only the data of NO and O2, without the data of the material composition. Therefore, it is urgent to propose a method for calculating the material balance of the SCR denitration system, which can provide guidance for the on-site optimization operation and performance evaluation. SUMMARY

[0003] The present application provides a method, system, device and medium for designing the material balance of an SCR denitration system, which solves the problem that the measurement of the data of the SCR denitration system after coal-fired power plants burn sludge lacks the change of the material concentration at the inlet and outlet and the composition of flue gas.

[0004] To solve the above technical problems, the present application provides a method for designing the material balance of an SCR denitration system after coal-fired power plants burn sludge, which comprises the following steps:

[0005] Obtaining the oxygen content in the inlet flue gas, the dry flue gas volume and the actual volume of pollutants in the inlet dry flue gas, and setting the oxygen content and the dry flue gas volume in the inlet flue gas as the oxygen content and the dry flue gas volume in the preset outlet flue gas under standard state;

[0006] According to the oxygen content and the dry flue gas volume in the preset outlet flue gas, the conversion concentration of the pollutants in the outlet dry flue gas is converted into the actual volume of the pollutants in the outlet dry flue gas under standard state; the conversion concentration of the pollutants in the outlet dry flue gas is obtained by conversion of the pollutant removal efficiency, and the pollutants at least include nitrogen monoxide;

[0007] According to the actual volume of the pollutants in the outlet dry flue gas, the reaction amount of the pollutants in the reaction process of the SCR denitration system is obtained, and the amount of the denitration agent input into the system and the oxygen content and the dry flue gas volume in the outlet flue gas under standard state are calculated according to the ammonia emission requirement of the outlet flue gas;

[0008] Comparing the oxygen content and the dry flue gas volume in the outlet flue gas with the oxygen content and the dry flue gas volume in the preset outlet flue gas to obtain a comparison error;

[0009] judging whether the comparison error reaches a preset requirement; if yes, outputting the oxygen content and dry flue gas amount in the import flue gas and the dosage of the de-NOx agent input into the system; if no, updating the oxygen content and dry flue gas amount in the import flue gas and reiteratively calculating the comparison error according to the oxygen content and dry flue gas amount in the import flue gas until the comparison error reaches the preset requirement.

[0010] Further, the conversion of the equivalent concentration of the pollutants in the export dry flue gas is carried out by the pollutant removal efficiency through the following formula:

[0011]

[0012] In the formula, and are the equivalent concentrations of the pollutants in the import and export dry flue gas under the standard state, respectively, with the unit of mg / Nm 3 ; is the de-pollutant efficiency of the system.

[0013] Further, the conversion of the equivalent concentration of the pollutants in the export flue gas into the actual volume of the pollutants in the export flue gas under the standard state according to the preset oxygen content and dry flue gas amount in the export flue gas includes:

[0014] The conversion of the equivalent concentration of the pollutants in the export flue gas into the actual concentration of the pollutants in the export dry flue gas is carried out through the following formula:

[0015]

[0016] In the formula, is the actual concentration of the pollutants in the export dry flue gas under the standard state; is the oxygen content in the preset export flue gas under the standard state;

[0017] The conversion of the actual concentration of the pollutants in the export dry flue gas into the actual volume of the pollutants in the export dry flue gas under the standard state is carried out through the following formula:

[0018]

[0019] In the formula, is the actual volume of the pollutants in the export dry flue gas under the standard state, with the unit of Nm 3 / (kg of garbage), V m is the molar volume constant of the gas; is the molar mass of the pollutants, with the unit of g / mol; is the dry flue gas amount in the preset export flue gas under the standard state, with the unit of Nm 3 / (kg of garbage).

[0020] Further, the reaction amount of the pollutants in the SCR denitration system reaction process is obtained according to the actual volume of the pollutants in the outlet dry flue gas, and the amount of the denitration agent input into the system and the oxygen content and the dry flue gas amount in the outlet flue gas under the standard state are calculated according to the ammonia emission requirement of the outlet flue gas, including:

[0021] The reaction amount of the pollutants is obtained by subtracting the actual volume of the pollutants in the outlet dry flue gas from the actual volume of the pollutants in the inlet dry flue gas:

[0022] The reaction amount of the ammonia and the oxygen and the generation amount of the water and the nitrogen are obtained according to the chemical reaction of the SCR denitration process;

[0023] The amount of the ammonia in the denitration agent is obtained according to the ammonia emission requirement of the outlet flue gas and the reaction amount of the ammonia.

[0024] The amount of the denitration agent input into the system is obtained according to the amount of the ammonia in the denitration agent.

[0025] The oxygen content and the dry flue gas amount in the outlet flue gas under the standard state are obtained according to the reaction amount of the ammonia and the oxygen, the generation amount of the water and the nitrogen, and the oxygen content, the dry flue gas amount and the actual volume of the pollutants in the inlet dry flue gas in the inlet flue gas.

[0026] Further, the reaction amount of the ammonia and the oxygen and the generation amount of the water and the nitrogen are obtained according to the chemical reaction of the SCR denitration process, including:

[0027]

[0028]

[0029]

[0030]

[0031] In the formula, and are respectively the reaction amount of NH3, O2 and the pollutants, and the generation amount of H2O and N2 in the SCR denitration process.

[0032] Further, the amount of the ammonia in the denitration agent is obtained according to the ammonia emission requirement of the outlet flue gas and the reaction amount of the ammonia, including:

[0033] The conversion concentration of the ammonia in the outlet flue gas is determined according to the ammonia emission requirement of the outlet flue gas;

[0034] The actual concentration of the ammonia in the outlet flue gas under the standard state is calculated by the following formula:

[0035]

[0036] In the formula, and respectively are the actual concentration and the converted concentration of ammonia in the outlet flue gas under standard state;

[0037] The actual concentration of ammonia in the outlet flue gas under standard state is converted into the actual volume of ammonia in the outlet flue gas under standard state by the following formula:

[0038]

[0039] In the formula, is the actual volume of NH3 in the dry flue gas at the outlet of the system under standard state; is the molar mass of NH3;

[0040] The actual volume of ammonia in the outlet flue gas under standard state is added to the reaction amount of ammonia to obtain the amount of ammonia in the denitration agent.

[0041] Further, according to the reaction amount of ammonia and oxygen, the generation amount of water and nitrogen, and the oxygen content, the dry flue gas amount, and the actual volume of pollutants in the inlet flue gas, the oxygen content and the dry flue gas amount in the outlet flue gas under standard state are obtained, comprising:

[0042] According to the reaction amount of ammonia and oxygen, the generation amount of water and nitrogen, and the oxygen content, the dry flue gas amount, and the actual volume of pollutants in the inlet flue gas, the emission amounts of nitrogen monoxide, oxygen, nitrogen, and ammonia in the outlet flue gas are calculated, wherein the emission amounts of nitrogen monoxide, oxygen, nitrogen, and ammonia are calculated by the following formulas respectively:

[0043]

[0044]

[0045]

[0046]

[0047] In the formula, and respectively are the emission amounts of NO, NH3, N2, and O2 in the outlet flue gas; and respectively are the input amounts of NO, N2, and O2 in the inlet flue gas; and respectively are the reaction amounts of NO, NH3, and O2 and the generation amount of N2 in the SCR denitration reaction; the input amount of N2 in the inlet flue gas is obtained from the dry flue gas amount of the inlet flue gas; the amount of ammonia gas used in the denitration agent;

[0048] the oxygen content in the outlet flue gas under the standard state is the emission amount of oxygen in the outlet flue gas;

[0049] the dry flue gas amount in the outlet flue gas under the standard state is obtained by the following formula:

[0050]

[0051] in the formula, and are the inlet and outlet dry flue gas amounts under the standard state, respectively.

[0052] The second aspect of the present application provides a coal-fired power plant mixed with sludge after the SCR denitration system material balance design system, comprising:

[0053] The data acquisition module is used for acquiring the oxygen content and dry flue gas amount in the inlet flue gas, and the actual volume of pollutants in the inlet dry flue gas, and setting the oxygen content and dry flue gas amount in the inlet flue gas as the oxygen content and dry flue gas amount in the preset outlet flue gas under the standard state;

[0054] The concentration conversion module is used for converting the equivalent concentration of pollutants in the outlet dry flue gas into the actual volume of pollutants in the outlet dry flue gas under the standard state according to the oxygen content and dry flue gas amount in the preset outlet flue gas; the equivalent concentration of pollutants in the outlet dry flue gas is obtained by conversion of the pollutant removal efficiency, and the pollutants at least include nitrogen monoxide;

[0055] The data calculation module is used for acquiring the reaction amount of pollutants in the SCR denitration system reaction process according to the actual volume of pollutants in the outlet dry flue gas, and calculating the amount of denitration agent input into the system and the oxygen content and dry flue gas amount in the outlet flue gas under the standard state according to the ammonia emission requirement of the outlet flue gas;

[0056] The error calculation module is used for comparing the oxygen content and dry flue gas amount in the outlet flue gas with the oxygen content and dry flue gas amount in the preset outlet flue gas to obtain a comparison error;

[0057] The iterative calculation module is used for judging whether the comparison error reaches a preset requirement; if yes, the oxygen content and dry flue gas amount in the inlet flue gas and the amount of denitration agent input into the system are output; if not, the oxygen content and dry flue gas amount in the inlet flue gas are updated, and the iterative calculation of the comparison error is re-performed according to the oxygen content and dry flue gas amount in the inlet flue gas until the comparison error reaches the preset requirement.

[0058] The third aspect of the present application provides an electronic device comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor implements the coal-fired power plant mixed burning of sludge after SCR denitration system material balance design method according to any one of the first aspect.

[0059] The fourth aspect of the present application provides a computer readable storage medium comprising a stored computer program, wherein the computer readable storage medium controls the device where the computer readable storage medium is located to execute the coal-fired power plant mixed burning of sludge after SCR denitration system material balance design method according to any one of the first aspect when the computer program runs.

[0060] Compared with the prior art, the beneficial effects of the embodiment of the present application are as follows:

[0061] The present application provides a coal-fired power plant mixed burning of sludge after SCR denitration system material balance design method, system, device and medium, the method comprising: obtaining the oxygen content, dry flue gas volume and actual volume of pollutants in the imported dry flue gas in the imported flue gas, and setting the oxygen content and dry flue gas volume in the imported flue gas as the oxygen content and dry flue gas volume in the preset outlet flue gas under standard state; according to the oxygen content and dry flue gas volume in the preset outlet flue gas, converting the converted concentration of pollutants in the outlet dry flue gas into the actual volume of pollutants in the outlet dry flue gas under standard state; the converted concentration of pollutants in the outlet dry flue gas is converted from the pollutant removal efficiency, and the pollutants at least include nitrogen monoxide; obtaining the reaction amount of pollutants in the SCR denitration system reaction process according to the actual volume of pollutants in the outlet dry flue gas, and calculating the amount of denitration agent input into the system and the oxygen content and dry flue gas volume in the outlet flue gas under standard state according to the ammonia emission requirement of the outlet flue gas; comparing the oxygen content and dry flue gas volume in the outlet flue gas with the oxygen content and dry flue gas volume in the preset outlet flue gas to obtain the comparison error; judging whether the comparison error meets the preset requirement; if yes, outputting the oxygen content and dry flue gas volume in the imported flue gas and the amount of denitration agent input into the system; if not, updating the oxygen content and dry flue gas volume in the imported flue gas, and iteratively calculating the comparison error according to the oxygen content and dry flue gas volume in the imported flue gas again until the comparison error meets the preset requirement; solve the phenomenon of lack of import and export material concentration and flue gas composition change in the measurement of SCR denitration system data, and provide guidance for on-site optimization operation and performance evaluation. BRIEF DESCRIPTION OF DRAWINGS

[0062] To more clearly illustrate the technical solution of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0063] Figure 1 This is a flowchart of a material balance design method for an SCR denitrification system after co-firing sludge in a coal-fired power plant, provided by a certain embodiment of the present invention;

[0064] Figure 2 This is a device diagram of a material balance design system for an SCR denitrification system after co-firing sludge in a coal-fired power plant, provided in a certain embodiment of the present invention;

[0065] Figure 3 This is a structural diagram of an electronic device provided in a certain embodiment of the present invention. Detailed Implementation

[0066] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings and examples. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0067] It should be understood that the step numbers used in the text are for ease of description only and are not intended to limit the order in which the steps are performed.

[0068] It should be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0069] The terms “comprising” and “including” indicate the presence of the described feature, whole, step, operation, element and / or component, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0070] The term “and / or” refers to any combination of one or more of the associated listed items, as well as all possible combinations, and includes these combinations.

[0071] In one embodiment, such as Figure 1 As shown, the first aspect of the present invention provides a material balance design method for an SCR denitrification system after co-firing sludge in a coal-fired power plant, comprising:

[0072] S1, obtaining the oxygen content, dry flue gas volume and actual volume of pollutants in the imported dry flue gas in the imported flue gas, and setting the oxygen content and dry flue gas volume in the imported flue gas as the oxygen content and dry flue gas volume in the preset outlet flue gas under standard state;

[0073] Specifically, the imported flue gas includes dry flue gas and water vapor, wherein the dry flue gas at least includes oxygen, nitrogen and pollutants. Since the present application converts the removal efficiency of pollutants into the conversion concentration for material calculation, the conversion concentration cannot be directly used for material balance calculation, and needs to be converted into actual concentration, standard state volume and other parameters first, and the premise of conversion is to know the oxygen content and dry flue gas volume at the position. Therefore, it is necessary to calculate the composition of the outlet flue gas by using the method of hypothesis testing, that is, to obtain the oxygen content, dry flue gas volume and actual volume of pollutants in the imported dry flue gas in the imported flue gas; wherein the dry flue gas volume in the imported flue gas includes the input amount of nitrogen in the imported flue gas, and the actual volume of pollutants is the pollutant content; then the oxygen content and dry flue gas volume of the imported flue gas are used as the initial iteration data, and the oxygen content and dry flue gas volume in the imported flue gas are set as the oxygen content and dry flue gas volume in the preset outlet flue gas under standard state.

[0074] S2, converting the conversion concentration of pollutants in the outlet dry flue gas into the actual volume of pollutants in the outlet dry flue gas under standard state according to the oxygen content and dry flue gas volume in the preset outlet flue gas; the conversion concentration of pollutants in the outlet dry flue gas is converted from the removal efficiency of pollutants, and the pollutants at least include nitrogen monoxide;

[0075] Specifically, the pollutants usually include nitrogen oxides such as nitrogen monoxide and nitrogen dioxide, but since the nitrogen dioxide content is very small in the material balance calculation, and only NO, NH3, H2O, N2 and O2 have total amount (standard state volume, mass, molar amount, etc.) change in the SCR denitration process, other substances do not change, therefore, the pollutants NO x represents nitrogen monoxide.

[0076] The removal efficiency of pollutants in the SCR denitration system is affected by many factors, and the amount of denitration agent is the main influencing factor, however, too much amount will lead to high ammonia escape rate, and too little amount will lead to too low removal efficiency of pollutants, thereby causing environmental pollution. Therefore, the amount of denitration agent cannot be randomly controlled, and only the removal efficiency can be controlled by controlling the amount and composition of catalyst, and the denitration efficiency is decided by artificial, and the optimal value is 60%.

[0077] According to the definition of removal efficiency in the national standard: the NO x concentration removed by the denitration system after operation is less than 200 mg / m3. xThe concentration percentage, the pollutant removal efficiency is converted into the equivalent concentration of the pollutant in the outlet dry flue gas. In a specific embodiment, the equivalent concentration of the pollutant in the outlet dry flue gas is converted from the pollutant removal efficiency by the following formula:

[0078]

[0079] wherein, and are the equivalent concentrations of the pollutant in the inlet and outlet dry flue gas under the standard state, respectively, in mg / Nm 3 ; is the decontamination efficiency of the system.

[0080] The conversion of the removal efficiency into the equivalent concentration of the pollutant in the outlet dry flue gas is convenient for subsequent acquisition of the variation of the pollutant and the parameters of each component in the outlet flue gas.

[0081] According to the preset oxygen content in the outlet flue gas and the dry flue gas amount, the equivalent concentration of the pollutant at the outlet of the SCR denitration system is converted into the actual concentration and the standard state volume. In a specific embodiment, the equivalent concentration of the pollutant in the outlet flue gas is converted into the actual volume of the pollutant in the outlet flue gas under the standard state according to the preset oxygen content in the outlet flue gas and the dry flue gas amount, including:

[0082] The equivalent concentration of the pollutant in the outlet flue gas is converted into the actual concentration of the pollutant in the outlet dry flue gas by the following formula:

[0083]

[0084] wherein, is the actual concentration of the pollutant in the outlet dry flue gas under the standard state; is the oxygen content in the preset outlet flue gas under the standard state;

[0085] The actual concentration of the pollutant in the outlet dry flue gas is converted into the actual volume of the pollutant in the outlet dry flue gas under the standard state by the following formula:

[0086]

[0087] wherein, is the actual volume of the pollutant in the outlet dry flue gas under the standard state, in Nm 3 / (kg of garbage), V m is the molar volume constant of the gas; is the molar mass of the pollutant, in g / mol; is the dry flue gas amount in the preset outlet flue gas under the standard state, in Nm 3 / (kg of garbage).

[0088] The removal efficiency of pollutants in the SCR denitration system is converted into the equivalent concentration of pollutants in the outlet flue gas, and then the equivalent concentration is converted into the actual volume of pollutants in the outlet flue gas under standard state, so as to facilitate the calculation of the inlet and outlet material concentrations and the change of flue gas composition.

[0089] S3, obtaining the reaction amount of pollutants in the reaction process of the SCR denitration system according to the actual volume of pollutants in the outlet dry flue gas, and calculating the amount of denitration agent input into the system and the oxygen content and dry flue gas amount in the outlet flue gas under standard state according to the ammonia emission requirement of the outlet flue gas;

[0090] In a specific embodiment, step S4 comprises:

[0091] The actual volume of pollutants in the inlet dry flue gas is subtracted from the actual volume of pollutants in the outlet dry flue gas to obtain the reaction amount of pollutants; wherein the reaction amount of pollutants in the SCR denitration process is obtained by the following formula:

[0092]

[0093] In the formula, is the reaction amount of pollutants in the system under standard state; is the actual volume of pollutants in the inlet dry flue gas of the system under standard state, which is a known quantity provided before calculation.

[0094] According to the chemical reaction occurring in the SCR denitration process, the reaction amount of ammonia and oxygen and the generation amount of water and nitrogen are obtained;

[0095] Specifically, the chemical reaction equation in the chemical reaction occurring in the SCR denitration process is 4NH3+6NO=5N2+6H2O. According to the chemical reaction occurring in the SCR denitration process, the generation amount or reaction amount of other substances can be calculated, including the reaction amount of ammonia and oxygen and the generation amount of water and nitrogen. In a specific embodiment, the reaction amount of ammonia and oxygen and the generation amount of water and nitrogen are obtained by the following formulas, respectively, including:

[0096]

[0097]

[0098]

[0099]

[0100] In the formula, and are the reaction amount of NH3, O2 and pollutants, and the generation amount of H2O and N2 in the SCR denitration process, respectively.

[0101] According to the ammonia emission amount in the outlet flue gas and the reaction amount of ammonia, the ammonia amount in the denitration agent is obtained;

[0102] Specifically, unlike the general molar ratio calculation of the removal agent amount, for the SCR denitration system, the current relevant ultra-low emission standard also puts forward a limit value requirement (less than 8 mg / m 3 ) for NH3 emission. Therefore, when calculating the ammonia amount, the balance needs to be considered, and the conversion concentration of ammonia needs to be controlled.

[0103] In a specific embodiment, according to the ammonia emission amount in the outlet flue gas and the reaction amount of ammonia, the ammonia amount in the denitration agent is obtained, comprising:

[0104] According to the ammonia emission amount in the outlet flue gas, the conversion concentration of ammonia in the outlet flue gas is determined, which is preferably 5 mg / m 3 ;

[0105] The actual concentration of ammonia in the outlet flue gas under standard conditions is calculated by the following formula:

[0106]

[0107] In the formula, and respectively, the actual concentration and the conversion concentration of ammonia in the outlet flue gas under standard conditions;

[0108] The actual volume of ammonia in the outlet flue gas under standard conditions is converted to the actual volume of ammonia in the outlet flue gas under standard conditions by the following formula:

[0109]

[0110] In the formula, is the actual volume of NH3 in the dry flue gas at the outlet of the system under standard conditions; is the molar mass of NH3;

[0111] The actual volume of ammonia in the outlet flue gas under standard conditions is added to the reaction amount of ammonia to obtain the ammonia amount in the denitration agent.

[0112] According to the ammonia amount in the denitration agent, the denitration agent amount input into the system is obtained;

[0113] Specifically, the ammonia amount in the actually input denitration agent is obtained by the following formula:

[0114]

[0115] In the formula, is the NH3 amount in the denitration agent input into the system; is the reaction amount of NH3 in the SCR denitration process.

[0116] The denitration agent actually input into the SCR denitration system is a gaseous mixture, the main components of which are NH3 and H2O, and other components can be ignored. The ammonia and water are made into the denitration agent in proportion. In the present application, the standard state volume of NH3 is preferably 30%, and the standard state volume of another main component H2O input into the system can be calculated by the following formula:

[0117]

[0118] In the formula, is the amount of H2O input into the denitration agent.

[0119] According to the reaction amount of ammonia and oxygen, the generation amount of water and nitrogen, and the actual volume of oxygen content, dry flue gas amount and pollutants in the imported dry flue gas, the oxygen content and dry flue gas amount in the outlet flue gas under standard state are obtained.

[0120] Specifically, in the SCR denitration process, only the flue gas components with total amount (standard state volume, mass, molar amount, etc.) changing are NO, NH3, H2O, N2 and O2, and other substances do not change. Therefore, in this process, the total NO change amount in the system is the reaction amount of NO; the total NH3 change amount in the system is the emission amount of NH3 in the outlet dry flue gas of the system under standard state (actual volume); the total H2O change amount in the system is the sum of the amount of H2O input into the denitration agent and the reaction amount of H2O; the total N2 change amount in the system is the generation amount of N2; and the total O2 change amount in the system is the consumption amount of O2. In a specific embodiment, according to the reaction amount of ammonia and oxygen, the generation amount of water and nitrogen, and the actual volume of oxygen content, dry flue gas amount and pollutants in the imported dry flue gas, the emission amounts of nitrogen monoxide, oxygen, nitrogen and ammonia in the outlet flue gas are calculated; wherein the emission amounts of nitrogen monoxide, oxygen, nitrogen and ammonia are calculated by the following formulas, respectively:

[0121]

[0122]

[0123]

[0124]

[0125] In the formula, and are the emission amounts of NO, NH3, N2 and O2 in the outlet flue gas, respectively. and These represent the input amounts of NO, N2, and O2 in the inlet flue gas, respectively. and These represent the reaction amounts of NO, NH3, and O2, and the amount of N2 generated during the SCR denitrification reaction, respectively; the amount of N2 input into the inlet flue gas is obtained from the dry flue gas volume of the inlet flue gas. This refers to the amount of ammonia used in the denitrification agent;

[0126] The oxygen content in the flue gas at the outlet under standard conditions is the amount of oxygen emitted in the flue gas at the outlet.

[0127] The amount of dry flue gas in the outlet flue gas under standard conditions is obtained by the following formula:

[0128]

[0129] In the formula, and These are the inlet and outlet dry flue gas volumes under standard conditions.

[0130] S4. Compare the oxygen content and dry flue gas volume in the outlet flue gas with the preset oxygen content and dry flue gas volume in the outlet flue gas to obtain the comparison error.

[0131] Specifically, the oxygen content and dry flue gas volume in the outlet flue gas are verified using the following formula to obtain the comparison error:

[0132]

[0133] In the formula, The O2 content in the dry flue gas at the system inlet under standard conditions; The standard volume of O2 in the dry flue gas at the system inlet under standard conditions; This refers to the standard volume of the dry flue gas at the system inlet under standard conditions.

[0134] S5. Determine whether the comparison error meets the preset requirements; if it does, output the oxygen content and dry flue gas volume in the inlet flue gas, as well as the amount of denitrification agent added to the system; if it does not meet the requirements, update the oxygen content and dry flue gas volume in the inlet flue gas, and recalculate the comparison error iteratively based on the oxygen content and dry flue gas volume in the inlet flue gas until the comparison error meets the preset requirements.

[0135] The oxygen content and dry flue gas volume in the calibrated outlet flue gas are compared with the preset oxygen content and dry flue gas volume in the outlet flue gas, and it is determined whether the comparison error meets the preset requirements. Generally, the smaller the preset requirements, the better, usually 0. If they are met, the oxygen content and dry flue gas volume in the inlet flue gas and the amount of denitrification agent added to the system are output. If they are not met, the oxygen content and dry flue gas volume in the inlet flue gas are updated and the iterative calculation is performed again until the comparison error meets the preset requirements.

[0136] In one specific embodiment, the comparison errors of the calculated O2 content and dry flue gas volume parameters were approximately 0.02952% and 0.00086%, respectively, indicating that the calculated results were very close to the actual results; the calculation results were iterated three times, and the error obtained was 0.

[0137] This invention addresses the lack of data on inlet and outlet material concentrations and flue gas composition changes in SCR denitrification system measurements. It proposes a material balance design method for SCR denitrification systems in coal-fired power plants that incorporate sludge. This method assumes the oxygen content and dry flue gas volume in the inlet flue gas to be the preset oxygen content and dry flue gas volume in the outlet flue gas, and converts the pollutant removal efficiency into the actual volume of pollutants under standard conditions. Based on the chemical reactions during the SCR denitrification process, the changes in pollutants and ammonia mixtures are calculated. The changes in the composition of the inlet and outlet flue gas are summarized, and parameters of each component in the outlet flue gas are obtained and compared with the preset oxygen content and dry flue gas volume. When the comparison error meets the preset requirements, the material calculation results are summarized, providing guidance for on-site optimization and performance evaluation.

[0138] It should be noted that although the steps in the flowchart above are shown sequentially as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order requirement for the execution of these steps, and they can be executed in other orders.

[0139] In another embodiment, such as Figure 2 As shown, a second aspect of the present invention provides a material balance design system for an SCR denitrification system after co-firing sludge in a coal-fired power plant, comprising:

[0140] Data acquisition module 10 is used to acquire the oxygen content, dry flue gas volume and actual volume of pollutants in the imported flue gas, and set the oxygen content and dry flue gas volume of the imported flue gas to the preset oxygen content and dry flue gas volume of the outlet flue gas under standard conditions.

[0141] The concentration conversion module 20 is used to convert the calculated concentration of pollutants in the outlet dry flue gas into the actual volume of pollutants in the outlet dry flue gas under standard conditions based on the preset oxygen content and dry flue gas volume in the outlet flue gas; the calculated concentration of pollutants in the outlet dry flue gas is obtained by converting the pollutant removal efficiency, and the pollutants include at least nitric oxide.

[0142] The data calculation module 30 is used to obtain the amount of pollutants reacted during the SCR denitrification system reaction process based on the actual volume of pollutants in the outlet dry flue gas, and to calculate the amount of denitrification agent added to the system and the oxygen content and dry flue gas volume in the outlet flue gas under standard conditions according to the requirements for ammonia emission in the outlet flue gas.

[0143] The error calculation module 40 is configured to compare the oxygen content and the dry flue gas volume in the outlet flue gas with the preset oxygen content and dry flue gas volume in the outlet flue gas to obtain a comparison error.

[0144] The iteration calculation module 50 is configured to determine whether the comparison error reaches a preset requirement. If yes, the oxygen content and the dry flue gas volume in the inlet flue gas and the amount of the denitration agent input into the system are output. If no, the oxygen content and the dry flue gas volume in the inlet flue gas are updated, and the iteration calculation of the comparison error is performed again according to the oxygen content and the dry flue gas volume in the inlet flue gas until the comparison error reaches the preset requirement.

[0145] It should be noted that the above-mentioned modules in the system for designing the material balance of the SCR denitration system of the coal-fired power plant after blending with sludge can be realized by software, hardware or a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in hardware form, or can be stored in the memory in the computer device in software form, so as to be called and executed by the processor to perform the operations corresponding to the above-mentioned modules. For the specific limitations of the system for designing the material balance of the SCR denitration system of the coal-fired power plant after blending with sludge, refer to the limitations of the method for designing the material balance of the SCR denitration system of the coal-fired power plant after blending with sludge, both of which have the same functions and effects, and will not be described here.

[0146] The third aspect of the present application provides an electronic device, which comprises:

[0147] a processor, a memory and a bus;

[0148] the bus is configured to connect the processor and the memory;

[0149] the memory is configured to store operation instructions;

[0150] the processor is configured to execute the operations corresponding to the method for designing the material balance of the SCR denitration system of the coal-fired power plant after blending with sludge by calling the operation instructions.

[0151] In an optional embodiment, an electronic device is provided, which is as shown in Figure 3 The electronic device 5000 shown in Figure 3 The electronic device 5000 shown in

[0152] The processor 5001 can be a CPU, a general-purpose processor, a DSP, an ASIC, an FPGA, or other programmable logic device, transistor logic device, hardware component, or any combination thereof. It can implement or execute various exemplary logical blocks, modules, and circuits described in conjunction with the disclosure. The processor 5001 can also be a combination of computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, etc.

[0153] The bus 5002 can include a path for transmitting information between the above-mentioned components. The bus 5002 can be a PCI bus or an EISA bus, etc. The bus 5002 can be divided into an address bus, a data bus, a control bus, etc. For convenience of representation, Figure 3 In the figure, only one thick line is used to represent, but it does not mean that there is only one bus or one type of bus.

[0154] The memory 5003 can be a ROM or other type of static storage device that can store static information and instructions, a RAM or other type of dynamic storage device that can store information and instructions, an EEPROM, a CD-ROM or other optical disk storage, an optical disk storage (including a compact disk, a laser disk, an optical disk, a digital versatile disk, a Blu-ray disk, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and capable of being accessed by a computer, but not limited to this.

[0155] The memory 5003 is used to store application program codes for executing the scheme of the present application, and is controlled by the processor 5001 to execute. The processor 5001 is used to execute the application program codes stored in the memory 5003 to realize the content shown in any of the foregoing method embodiments.

[0156] The electronic device includes, but is not limited to, a mobile terminal such as a mobile phone, a notebook computer, a digital broadcast receiver, a PDA (Personal Digital Assistant), a PAD (Tablet Personal Computer), a PMP (Portable Multimedia Player), a car terminal (such as a car navigation terminal), and the like, and a fixed terminal such as a digital TV, a desktop computer, and the like.

[0157] The fourth aspect of the present application provides a computer readable storage medium, and a computer program is stored on the computer readable storage medium. The program is executed by a processor to implement the coal-fired power plant mixed burning of sludge after SCR denitration system material balance design method shown in the first aspect of the present application.

[0158] Another embodiment of the present application provides a computer readable storage medium, and a computer program is stored on the computer readable storage medium. When it runs on a computer, it makes the computer can execute the corresponding content in the foregoing method embodiment.

[0159] In addition, an embodiment of the present application also provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the steps of the above method.

[0160] To sum up, the present application discloses a kind of coal-fired power plant mixed burning sludge after SCR denitration system material balance design method, system, equipment and medium;Among them, the oxygen content and dry flue gas amount in the import flue gas are assumed as the oxygen content and dry flue gas amount in the preset export flue gas, and the pollutant removal efficiency is converted into the actual volume of pollutant in standard state;According to the chemical reaction in the process of SCR denitration, the change amount of pollutant and ammonia gas mixture and other materials is calculated;Summarize the change of system import and export flue gas composition, and obtain the parameters of each component in the system export flue gas from it, compared with the oxygen content and dry flue gas amount in the preset export flue gas, when the comparison error obtained satisfies preset requirement, summarize material calculation result;Solve the phenomenon of lacking import and export material concentration and flue gas composition change in the measurement of SCR denitration system data, and provide guidance for on-site optimization operation and performance evaluation.

[0161] Each embodiment in the specification is described in a progressive manner, and the same or similar parts of each embodiment can be referred to each other, and each embodiment focuses on the difference from other embodiments. It should be noted that each technical feature of the above embodiments can be combined arbitrarily, and in order to make the description simple, each technical feature of the above embodiments is not described all possible combinations, however, as long as the combination of these technical features does not exist contradictory, it should be considered as the scope of the present application.

[0162] The above-described embodiments only express several preferred embodiments of the present application, and the description is more specific and detailed, but it should not be understood as limiting the scope of the patent. It should be noted that for ordinary skilled in the art, without departing from the technical principles of the present application, some improvements and replacements can be made, and these improvements and replacements should be considered as the protection scope of the present application. Therefore, the protection scope of the present application patent should be subject to the protection scope of the claims.

Claims

1. A material balance design method for an SCR denitrification system, characterized in that, Includes the following steps: Obtain the oxygen content, dry flue gas volume, and actual volume of pollutants in the imported dry flue gas, and set the oxygen content and dry flue gas volume of the imported flue gas to the preset oxygen content and dry flue gas volume of the outlet flue gas under standard conditions. Based on the preset oxygen content and dry flue gas volume in the outlet flue gas, the calculated concentration of pollutants in the outlet dry flue gas is converted into the actual volume of pollutants in the outlet dry flue gas under standard conditions. This includes converting the calculated concentration of pollutants in the outlet flue gas into the actual concentration of pollutants in the outlet dry flue gas using the following formula: In the formula, This represents the actual concentration of pollutants in the dry flue gas at the outlet under standard conditions. The oxygen content in the outlet flue gas is preset under standard conditions; The actual concentration of pollutants in the outlet dry flue gas is converted into the actual volume of pollutants in the outlet dry flue gas under standard conditions using the following formula: In the formula, The actual volume of pollutants in the dry flue gas at the outlet under standard conditions, in Nm³. 3 / kg of garbage The molar volume constant of the gas; The molar mass of the pollutant is expressed in g / mol. The preset dry flue gas quantity in the outlet flue gas under standard conditions, in Nm³. 3 / kg of waste; the converted concentration of pollutants in the outlet dry flue gas is obtained by converting the pollutant removal efficiency, and the pollutants include at least nitric oxide; The reaction amount of pollutants in the SCR denitrification system is obtained based on the actual volume of pollutants in the outlet dry flue gas. The amount of denitrifying agent added to the system and the oxygen content and dry flue gas volume in the outlet flue gas under standard conditions are calculated according to the ammonia emission requirements in the outlet flue gas. This includes: subtracting the actual volume of pollutants in the outlet dry flue gas from the actual volume of pollutants in the inlet dry flue gas to obtain the reaction amount of pollutants; obtaining the reaction amount of ammonia and oxygen, and the generation amounts of water and nitrogen, based on the chemical reactions occurring during the SCR denitrification process; obtaining the ammonia dosage in the denitrifying agent based on the ammonia emission requirements in the outlet flue gas and the ammonia reaction amount; obtaining the amount of denitrifying agent added to the system based on the ammonia dosage in the denitrifying agent; and obtaining the oxygen content and dry flue gas volume in the outlet flue gas under standard conditions based on the reaction amount of ammonia and oxygen, the generation amounts of water and nitrogen, the oxygen content in the inlet flue gas, the dry flue gas volume, and the actual volume of pollutants in the inlet dry flue gas. The oxygen content and dry flue gas volume in the outlet flue gas are compared with the preset oxygen content and dry flue gas volume to obtain the comparison error. Determine whether the comparison error meets the preset requirements; if it does, output the oxygen content and dry flue gas volume in the inlet flue gas, as well as the amount of denitrification agent added to the system; if it does not meet the requirements, update the oxygen content and dry flue gas volume in the inlet flue gas, and recalculate the comparison error iteratively based on the oxygen content and dry flue gas volume in the inlet flue gas until the comparison error meets the preset requirements.

2. The material balance design method for an SCR denitrification system according to claim 1, characterized in that, The calculated concentration of pollutants in the outlet dry flue gas is converted from the pollutant removal efficiency using the following formula: In the formula, These are the converted concentrations of pollutants in the inlet and outlet dry flue gas under standard conditions, in mg / Nm³. 3 ; The system's pollutant removal efficiency.

3. The material balance design system for an SCR denitrification system according to claim 1, characterized in that, The amounts of ammonia and oxygen reacted, and the amounts of water and nitrogen produced, are obtained using the following formulas, including: ； ； ； ； In the formula, , , , and These represent the reaction amounts of NH3, O2, and pollutants during the SCR denitrification process, as well as the generation amounts of H2O and N2.

4. The material balance design method for an SCR denitrification system according to claim 3, characterized in that, The step of obtaining the ammonia dosage in the denitrification agent based on the required ammonia emission amount in the outlet flue gas and the reaction amount of ammonia includes: The calculated concentration of ammonia in the flue gas is determined based on the required ammonia emission rate in the flue gas. The actual concentration of ammonia in the outlet flue gas under standard conditions can be calculated using the following formula: In the formula, and These are the actual and converted concentrations of ammonia in the outlet flue gas under standard conditions, respectively. The actual concentration of ammonia in the outlet flue gas under the standard conditions is converted to the actual volume of ammonia in the outlet flue gas under the standard conditions using the following formula: In the formula, For the dry flue gas at the system outlet under standard conditions The actual volume; for molar mass; The amount of ammonia used in the denitrification agent is obtained by adding the actual volume of ammonia in the outlet flue gas under the standard conditions to the amount of ammonia reacted.

5. The material balance design method for an SCR denitrification system according to claim 4, characterized in that, The step of obtaining the oxygen content and dry flue gas volume in the outlet flue gas under standard conditions based on the reaction amounts of ammonia and oxygen, the generation amounts of water and nitrogen, the oxygen content in the inlet flue gas, the dry flue gas volume, and the actual volume of pollutants in the inlet dry flue gas includes: Based on the reaction amounts of ammonia and oxygen, the amounts of water and nitrogen generated, the oxygen content in the inlet flue gas, the volume of dry flue gas, and the actual volume of pollutants in the inlet dry flue gas, the emissions of nitric oxide, oxygen, nitrogen, and ammonia in the outlet flue gas are calculated; wherein the emissions of nitric oxide, oxygen, nitrogen, and ammonia are calculated using the following formulas: ； ； ； ； In the formula, , , and These represent the emissions of NO, NH3, N2, and O2 in the flue gas at the outlet; , and These represent the input amounts of NO, N2, and O2 in the inlet flue gas, respectively. , , and These represent the reaction amounts of NO, NH3, and O2, and the amount of N2 generated during the SCR denitrification reaction, respectively; the amount of N2 input in the inlet flue gas is obtained from the dry flue gas volume of the inlet flue gas. The amount of ammonia gas used in the denitrification agent; The oxygen content in the outlet flue gas under the standard conditions is the amount of oxygen emitted in the outlet flue gas. The amount of dry flue gas in the outlet flue gas under standard conditions is obtained by the following formula: In the formula, These are the inlet and outlet dry flue gas volumes under standard conditions.

6. A material balance design system for an SCR denitrification system, characterized in that, include: The data acquisition module is used to acquire the oxygen content, dry flue gas volume, and actual volume of pollutants in the imported dry flue gas, and to set the oxygen content and dry flue gas volume of the imported flue gas to the preset oxygen content and dry flue gas volume of the outlet flue gas under standard conditions. The concentration conversion module is used to convert the calculated concentration of pollutants in the outlet dry flue gas into the actual volume of pollutants in the outlet dry flue gas under standard conditions based on the preset oxygen content and dry flue gas volume. This includes converting the calculated concentration of pollutants in the outlet flue gas into the actual concentration of pollutants in the outlet dry flue gas using the following formula: In the formula, This represents the actual concentration of pollutants in the dry flue gas at the outlet under standard conditions. The oxygen content in the outlet flue gas is preset under standard conditions; The actual concentration of pollutants in the outlet dry flue gas is converted into the actual volume of pollutants in the outlet dry flue gas under standard conditions using the following formula: In the formula, The actual volume of pollutants in the dry flue gas at the outlet under standard conditions, in Nm³. 3 / kg of garbage The molar volume constant of the gas; The molar mass of the pollutant is expressed in g / mol. The preset dry flue gas quantity in the outlet flue gas under standard conditions, in Nm³. 3 / kg of waste; the converted concentration of pollutants in the outlet dry flue gas is obtained by converting the pollutant removal efficiency, and the pollutants include at least nitric oxide; The data calculation module is used to obtain the reaction amount of pollutants during the SCR denitrification system reaction process based on the actual volume of pollutants in the outlet dry flue gas, and to calculate the amount of denitrification agent added to the system and the oxygen content and dry flue gas volume in the outlet flue gas under standard conditions according to the ammonia emission requirements in the outlet flue gas. This includes: subtracting the actual volume of pollutants in the outlet dry flue gas from the actual volume of pollutants in the inlet dry flue gas to obtain the reaction amount of pollutants; obtaining the reaction amount of ammonia and oxygen, and the generation amounts of water and nitrogen, based on the chemical reactions occurring during the SCR denitrification process; obtaining the ammonia dosage in the denitrification agent based on the ammonia emission requirements in the outlet flue gas and the ammonia reaction amount; obtaining the amount of denitrification agent added to the system based on the ammonia dosage in the denitrification agent; and obtaining the oxygen content and dry flue gas volume in the outlet flue gas under standard conditions based on the reaction amount of ammonia and oxygen, the generation amounts of water and nitrogen, the oxygen content in the inlet flue gas, the dry flue gas volume, and the actual volume of pollutants in the inlet dry flue gas. The error calculation module is used to compare the oxygen content and dry flue gas volume in the outlet flue gas with the preset oxygen content and dry flue gas volume in the outlet flue gas to obtain the comparison error. An iterative calculation module is used to determine whether the comparison error reaches a preset requirement. If it does, the module outputs the oxygen content and dry flue gas volume in the inlet flue gas, as well as the amount of denitrification agent added to the system. If it does not reach the preset requirement, the module updates the oxygen content and dry flue gas volume in the inlet flue gas and recalculates the comparison error iteratively based on the oxygen content and dry flue gas volume in the inlet flue gas until the comparison error reaches the preset requirement.

7. An electronic device, characterized in that, It includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor executes the computer program to implement the material balance design method for an SCR denitrification system as described in any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored computer program, wherein, when the computer program is executed, it controls the device containing the computer-readable storage medium to perform the material balance design method for an SCR denitrification system as described in any one of claims 1 to 5.

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