A method and system for purifying flue gas from a garbage incinerator

Abstract

The present application relates to a method and system for purifying flue gas from a waste incinerator, and relates to the field of waste treatment technology. The method includes obtaining a flue gas unit flow rate, a flue gas unit flow velocity, and a characteristic unit flow rate; determining a characteristic flow rate ratio based on the characteristic unit flow rate and the flue gas unit flow rate; forming a local gas combination based on each characteristic flow rate ratio, and determining an excess flow rate ratio of excess gas based on the local gas combination; determining a gas distribution combination based on all characteristic flow rate ratios and excess flow rate ratios; determining a required processing time corresponding to the gas distribution combination based on a processing matching relationship; determining a flue gas rising distance based on the required processing time and the flue gas unit flow velocity, and determining a rising vertex based on the flue gas rising distance; defining the exhaust port closest to and above the rising vertex as an operating port, and controlling the operating port to be open for a fixed time after the required processing time. The present application has the effect of reducing the overall cost of flue gas purification from waste incineration.

Description

Technical Field

[0001] The present application relates to the field of waste treatment technology, and in particular to a method and system for purifying flue gas from a waste incinerator. Background Art

[0002] A waste incinerator converts municipal solid waste, medical waste, and industrial waste into ash, flue gas, and heat through high-temperature combustion. Its primary function is to reduce waste volume, render it harmless, and recover heat for power generation or heating. Modern waste incinerators are often equipped with advanced flue gas purification systems to ensure that flue gas emissions meet environmental standards and reduce pollution.

[0003] In the related art, when treating the flue gas generated by waste incineration, the more mature process steps are cooling, deacidification, denitrification, dust removal, dioxin / furan treatment, deep purification and emission monitoring. Deacidification is the removal of acidic gases such as HCl and SO2 through dry or wet deacidification processes. The equipment used is generally a deacidification absorption tower. Alkaline absorption liquid is sprayed on the top of the absorption tower to chemically react with the acidic gases in the flue gas, thereby achieving deacidification. The deacidified gas is then discharged from the top of the absorption tower.

[0004] In the above-mentioned related technologies, when deacidifying flue gas, in order to ensure that the flue gas treatment can meet the standards, the dosage of alkaline absorption liquid is often increased to the maximum. At this time, the acidic gas can be effectively treated, that is, the acidic gas may be neutralized just after rising a certain distance in the absorption tower. At this time, other gases entering the absorption tower at the same time as the acidic gas still need to pass through the alkaline absorption liquid and move a certain distance. At this time, the heat of the gas will dissipate quickly, and the deacidified gas needs to be denitrified. During the denitrification treatment, it is necessary to ensure that the gas has a certain temperature. Therefore, the gas deacidified by this method cannot be directly denitrified. At this time, it is still necessary to add a heating device to heat the gas, which greatly increases the overall cost of waste incineration flue gas purification. There is still room for improvement. Summary of the Invention

[0005] In order to reduce the overall cost of waste incineration flue gas purification, the present application provides a waste incinerator flue gas purification method and system.

[0006] In a first aspect, the present application provides a method for purifying flue gas from a waste incinerator, which adopts the following technical solution:

[0007] A method for purifying flue gas from a garbage incinerator, comprising:

[0008] Obtain the unit flow rate, unit flow velocity, and characteristic unit flow rate of the incineration flue gas at the absorption tower inlet, wherein the characteristic gas is an acid gas with a large content specified in the flue gas;

[0009] Calculate the characteristic flow rate ratio of each characteristic gas based on the characteristic unit flow rate and the flue gas unit flow rate;

[0010] Combining the characteristic flow rates to form a local gas combination, and determining the excess flow rate ratio of the excess gas according to the local gas combination, wherein the excess gas is an acid gas with a smaller content in the flue gas;

[0011] Determine the gas distribution combination based on all characteristic flow ratios and excess flow ratios;

[0012] Determine the required processing time corresponding to the gas distribution combination based on the preset processing matching relationship;

[0013] Calculate the smoke rising distance based on the required processing time and the unit flow rate of the smoke, and determine the rising peak based on the smoke rising distance;

[0014] The exhaust port closest to and above the rising vertex is defined as the operating port, and the operating port is controlled to open for a preset fixed time after the demand processing time.

[0015] Optionally, the step of determining the excess flow ratio of excess gas according to the local gas combination includes:

[0016] A historical interval is established on a preset time axis, the latter end of which coincides with the current time point and has a width of a preset historical length, and the local gas composition and alkali solution consumption are obtained in the historical interval;

[0017] The monomer consumption is determined based on the characteristic flow ratio of each characteristic gas in the local gas combination, and the excess consumption of the excess gas is determined based on the total monomer consumption and the alkali solution consumption;

[0018] Determine the theoretical unit ratio corresponding to the excess consumption based on the preset ratio matching relationship;

[0019] Compare the current local gas combination with the local gas combination in the historical interval to determine the combination similarity;

[0020] The combination similarity with the largest value is determined according to the preset sorting rules, and the local gas combination in the historical interval corresponding to the combination similarity is defined as a similar gas combination, and the theoretical unit proportion corresponding to the similar gas combination is determined as the current excess flow proportion.

[0021] Optionally, the step of comparing the current local gas combination with the local gas combination in the historical interval to determine the combination similarity includes:

[0022] The characteristic flow ratio of the characteristic gas in the local gas combination is summed up and calculated to determine the combined flow ratio;

[0023] Calculate the difference between the two combined traffic proportions to determine the combined difference proportion;

[0024] Under the same characteristic gas, the deviation ratio is calculated based on the characteristic flow ratio corresponding to the two local gas combinations;

[0025] The combination similarity is determined by calculation based on the combination difference ratio, the preset ratio calculation parameters, the deviation ratio, and the preset ratio calculation parameters.

[0026] Optionally, after the combination similarity is determined, the waste incinerator flue gas purification method further includes:

[0027] Determine whether there are at least two local gas combinations with the same and maximum combination similarity;

[0028] If there are not at least two local gas combinations with the same and maximum combination similarity, then similar gas combinations are defined based on the local gas combinations corresponding to the maximum combination similarity;

[0029] If there are at least two local gas combinations with the same and largest combination similarity, the local gas combination corresponding to the largest combination similarity is defined as the alternative gas combination, and the theoretical unit ratio corresponding to the alternative gas combination is defined as the original unit ratio;

[0030] Compare the candidate gas combinations with the local gas combinations in the historical interval to determine the simulation similarity;

[0031] The theoretical unit ratio corresponding to the local gas combination in the corresponding historical interval when the simulation similarity is greater than the preset benchmark similarity is defined as the simulation unit ratio;

[0032] Calculate the overall deviation value based on the original unit proportion and all corresponding simulated unit proportions;

[0033] The overall deviation value with the smallest value is determined according to the sorting rule, and the alternative gas combination corresponding to the overall deviation value is defined as a similar gas combination.

[0034] Optionally, after the overall deviation value is determined, the waste incinerator flue gas purification method further includes:

[0035] Determining whether there are at least two alternative gas combinations with the same and minimum overall deviation values;

[0036] If there are not at least two alternative gas combinations with the same and smallest overall deviation values, the alternative gas combination corresponding to the smallest overall deviation value is determined as the similar gas combination;

[0037] If there are at least two alternative gas combinations with the same and smallest overall deviation values, the simulation unit proportion corresponding to each alternative gas combination is defined as the determination unit proportion;

[0038] Randomly select one judgment unit ratio from all judgment unit ratios as the standard unit ratio, and define the remaining judgment unit ratios as comparison unit ratios;

[0039] Calculate the representative deviation value based on the standard unit ratio and all comparison unit ratios, and determine the representative deviation value with the smallest value according to the sorting rules, and define the standard unit ratio corresponding to the representative deviation value as the representative unit ratio;

[0040] The difference between the representative unit ratio and the original unit ratio is calculated to determine the separated unit ratio, and the separated unit ratio with the smallest value is determined according to the sorting rules, and the alternative gas combination corresponding to the separated unit ratio is determined as the similar gas combination.

[0041] Optionally, after the operation port is determined, the waste incinerator flue gas purification method further includes:

[0042] Determine the distance between points based on the ascending apex and the working opening;

[0043] When the distance between the points is less than the preset reference distance, it is determined whether the exhaust port located above the working port and closest to the working port is in an open state;

[0044] If the exhaust port located above the working port and closest to the working port is not open, the currently determined working port is controlled to open;

[0045] If the exhaust port located above and closest to the working port is in an open state, the exhaust port located above and closest to the working port is updated to a new working port and maintained in an open state.

[0046] In a second aspect, the present application provides a waste incinerator flue gas purification system, which adopts the following technical solution:

[0047] A waste incinerator flue gas purification system, comprising:

[0048] An acquisition module is used to obtain the unit flow rate of the flue gas at the inlet of the absorption tower, the unit flow rate of the flue gas, and the characteristic unit flow rate of the characteristic gas, wherein the characteristic gas is an acid gas with a large content in the flue gas;

[0049] A processing module, connected to the acquisition module, for storing and processing information;

[0050] The processing module calculates the characteristic flow rate ratio of each characteristic gas based on the characteristic unit flow rate and the flue gas unit flow rate;

[0051] The processing module combines the characteristic flow ratios to form a local gas combination, and determines the excess flow ratio of the excess gas according to the local gas combination, wherein the excess gas is an acid gas with a smaller content specified in the flue gas;

[0052] The processing module determines the gas distribution combination according to all characteristic flow ratios and excess flow ratios;

[0053] The processing module determines the required processing time corresponding to the gas distribution combination according to the preset processing matching relationship;

[0054] The processing module calculates the smoke rising distance based on the required processing time and the unit flow rate of the smoke, and determines the rising vertex based on the smoke rising distance;

[0055] The processing module defines the exhaust port closest to and above the rising vertex as the operating port, and controls the operating port to open for a preset fixed time after the required processing time.

[0056] In a third aspect, the present application provides a computer storage medium capable of storing corresponding programs, which has the characteristics of reducing the overall cost of waste incineration flue gas purification, and adopts the following technical solutions:

[0057] A computer-readable storage medium stores a computer program that can be loaded by a processor and executed by any of the above-mentioned waste incinerator flue gas purification methods.

[0058] In summary, this application includes at least one of the following beneficial technical effects:

[0059] 1. When treating the flue gas generated by waste incineration, the effective deacidification time of the flue gas can be determined so that the deacidified gas can be discharged from the absorption tower nearby for denitrification treatment, thereby reducing the heat loss of the gas during the deacidification process and facilitating the subsequent denitrification operation;

[0060] 2. Analyze the gas distribution during the waste incineration process in the historical period to effectively predict and deal with the current excess gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 It is a flow chart of the flue gas purification method of a waste incinerator.

[0062] Figure 2 It is a module flow chart of the flue gas purification method of a waste incinerator. DETAILED DESCRIPTION

[0063] In order to make the purpose, technical solutions and advantages of this application more clear, the following Figure 1-Figure 2 It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application.

[0064] The embodiments of the present application are described in further detail below with reference to the accompanying drawings.

[0065] The present application discloses a method for purifying flue gas from a waste incinerator. Figure 1 The method flow of the waste incinerator flue gas purification method includes the following steps:

[0066] Step S100: obtaining the flue gas unit flow rate, flue gas unit flow velocity and characteristic unit flow rate of characteristic gas of the incineration flue gas at the absorption tower inlet, wherein the characteristic gas is an acid gas with a relatively large content in the flue gas.

[0067] The unit flow rate of incineration flue gas is the flow rate of flue gas entering the absorption tower from the absorption tower inlet per unit time, which can be determined by installing a flow meter at the absorption tower inlet; the unit flow rate of characteristic gas is the flow rate of characteristic gas entering the absorption tower from the absorption tower inlet per unit time. The characteristic gas is the acidic gas with a large content in the flue gas specified in advance by the staff, such as sulfur dioxide, hydrogen chloride, etc. The flow rate can be obtained by installing a specific flow meter at the absorption tower inlet that can detect a single characteristic gas, that is, each set characteristic gas should be installed with a corresponding flow meter at the absorption tower inlet; the unit flow rate of flue gas is the speed at which the flue gas generated by garbage incineration enters the absorption tower, which can also be determined by a flow meter.

[0068] Step S101: Calculate the characteristic flow rate ratio of each characteristic gas based on the characteristic unit flow rate and the flue gas unit flow rate.

[0069] The characteristic flow ratio is the ratio of the characteristic gas in the flue gas produced by incineration, which is determined by dividing the characteristic unit flow by the flue gas unit flow.

[0070] Step S102: combining the characteristic flow ratios to form a local gas combination, and determining the excess flow ratio of excess gas according to the local gas combination, wherein the excess gas is an acid gas with a smaller content in the flue gas.

[0071] The local gas combination is a combination of all characteristic gases, such as 1% hydrogen chloride + 2% sulfur dioxide. The excess gas is the acidic gas with a smaller content in the flue gas specified in advance by the staff, such as hydrobromic acid, hydrogen bromide, etc.; the excess flow ratio is the ratio of the excess gas to the flue gas generated by incineration. The determination method can refer to steps S200-S204 and will not be repeated here.

[0072] Step S103: determining a gas distribution combination according to all characteristic flow ratios and excess flow ratios.

[0073] The gas distribution combination includes all characteristic gases and excess gases, such as 1% hydrogen chloride + 2% sulfur dioxide + 0.05% hydrobromic acid.

[0074] Step S104: determining the required processing time corresponding to the gas distribution combination according to a preset processing matching relationship.

[0075] The required processing time is the time required for the absorption tower to effectively treat the acidic gas in the gas distribution combination by spraying alkaline absorption liquid. Different gas distribution combinations indicate different acidic conditions, and the corresponding required processing time is also different. The processing matching relationship between the two is determined by the staff through multiple tests in advance, which will not be elaborated here.

[0076] Step S105: Calculate the rising distance of the smoke according to the required processing time and the unit flow rate of the smoke, and determine the rising vertex according to the rising distance of the smoke.

[0077] The rising distance of flue gas is the distance that the flue gas without acid gas moves when the acid gas is effectively treated, which is determined by multiplying the required treatment time by the unit flow rate of the flue gas; the rising peak is the point where the flue gas reaches after moving the rising distance from the bottom, that is, the acid gas is completely neutralized after the flue gas reaches the rising peak.

[0078] Step S106: defining the exhaust port closest to and above the rising vertex as the operating port, and controlling the operating port to open for a preset fixed time after the required processing time.

[0079] The exhaust port is an outlet preset on the absorption tower and arranged at intervals in the height direction for the gas to be discharged from the absorption tower. The operating port is defined to distinguish different exhaust ports. The opening of the operating port is controlled to allow the gas that has been deacidified to be discharged directly from the absorption tower, reducing the heat loss of the gas during movement, thereby facilitating the subsequent denitrification treatment of the flue gas; the fixed time is the fixed time set by the staff for effective emission of the gas.

[0080] The steps of determining the excess flow ratio of excess gas according to the local gas combination include:

[0081] Step S200: establishing a historical interval on a preset time axis, the latter end of which coincides with the current time point and has a width of a preset historical duration, and obtaining a local gas combination and alkali solution consumption in the historical interval.

[0082] The time axis is a coordinate axis formed by the combination of various time points. The coordinate axis points from the time points that have passed to the time points that have not yet arrived. The time points that have passed are set as the front and the time points that have not yet arrived are set as the back. The historical duration is the duration set by the staff to obtain historical incineration data. The historical interval is established to facilitate the acquisition and analysis of data; the alkali liquid consumption is the amount of alkaline absorption liquid consumed during garbage treatment.

[0083] Step S201: determining the monomer consumption according to the characteristic flow ratio of each characteristic gas in the local gas combination, and calculating according to all monomer consumptions and alkali solution consumption to determine the excess consumption of excess gas.

[0084] The monomer consumption is the amount of alkaline absorption liquid required for the complete neutralization reaction of the characteristic gas with the characteristic flow ratio under normal circumstances. Different characteristic gases have different reaction relationships, so the corresponding monomer consumption is also different. The relationship between the characteristic gas, the characteristic flow ratio and the monomer consumption can be entered and determined in advance by the staff; the excess consumption is the consumption used for neutralization of the excess gas, which is determined by subtracting all monomer consumption from the alkali solution consumption.

[0085] Step S202: Determine the theoretical unit ratio corresponding to the excess consumption according to a preset ratio matching relationship.

[0086] The theoretical unit ratio is the ratio of excess gas required when the excess consumption of alkaline absorption liquid can be used under theoretical circumstances. The greater the excess consumption, the greater the corresponding theoretical unit ratio. The matching relationship between the two ratios can be determined and entered by the staff in advance through multiple tests.

[0087] Step S203: comparing the current local gas combination with the local gas combination in the historical interval to determine the combination similarity.

[0088] The combination similarity is a value reflecting the similarity between two combinations. The larger the value, the more similar the two combinations are. For a specific determination method, refer to steps S300 to S303.

[0089] Step S204: Determine the combination similarity with the largest value according to the preset sorting rules, define the local gas combination in the historical interval corresponding to the combination similarity as a similar gas combination, and determine the theoretical unit proportion corresponding to the similar gas combination as the current excess flow proportion.

[0090] The sorting rule is a method set by the staff to sort the size of the values, such as the bubbling method. The sorting rule can be used to determine the combination similarity with the largest value, that is, the local gas combination in the historical interval corresponding to the combination similarity is most similar to the current local gas combination. It is defined as a similar gas combination to achieve the distinction between different combinations, which is convenient for subsequent analysis; at this time, since the characteristic gases of the two combinations are relatively similar, it can be determined that the excess gases are also relatively similar, so the theoretical unit ratio corresponding to the similar gas combination can be determined as the current excess flow ratio, so as to achieve the prediction of the excess flow ratio of excess gas in the current flue gas.

[0091] The steps of comparing the current local gas combination with the local gas combination in the historical interval to determine the combination similarity include:

[0092] Step S300: performing summation calculation based on the characteristic flow ratios of the characteristic gases in the local gas combination to determine the combined flow ratio.

[0093] The combined flow ratio is the ratio of the characteristic gas present in a single local gas combination, and is obtained by adding the characteristic flow ratios of all characteristic gases.

[0094] Step S301: performing a difference calculation based on two combined traffic proportions to determine a combined difference proportion.

[0095] The combined difference ratio is the difference between the combined flow ratios of the two local gas combinations, and the difference is an absolute value.

[0096] Step S302 : Under the same characteristic gas, calculate the deviation ratio according to the characteristic flow ratios corresponding to the two local gas combinations.

[0097] The deviation ratio is the value of the deviation value of a single characteristic gas, and the calculation formula is: ,in is the deviation ratio, is the characteristic flow ratio of a single characteristic gas in the current local gas combination, is the characteristic flow ratio of a single characteristic gas in the local gas combination in the historical interval.

[0098] Step S303: performing calculation according to the combination difference ratio, the preset ratio calculation parameter, the deviation ratio, and the preset ratio calculation parameter to determine the combination similarity.

[0099] The proportion calculation parameters and ratio calculation parameters are the parameter values preset by the staff for calculation. The calculation formula for the combination similarity is: ,in is the combination similarity, is the proportion calculation parameter, is the proportion of combined difference, is the ratio calculation parameter, For the The deviation ratio obtained for each local gas combination, is the total number of local gas combinations identified in the historical interval, It is a fixed parameter value used for calculation and can generally be set to 1.

[0100] After the combination similarity is determined, the waste incinerator flue gas purification method further includes:

[0101] Step S400: Determine whether there are at least two local gas combinations with the same and maximum combination similarity.

[0102] The purpose of the judgment is to find out whether there are multiple local gas combinations that meet the requirements, so as to facilitate the subsequent determination of similar gas combinations.

[0103] Step S4001: If there are not at least two local gas combinations with the same and maximum combination similarity, a similar gas combination is defined according to the local gas combination corresponding to the maximum combination similarity.

[0104] When there are not at least two local gas combinations with the same and maximum combination similarity, it means that there is only one local gas combination that meets the requirements, and it can be defined as a similar gas combination.

[0105] Step S4002: If there are at least two local gas combinations with the same and largest combination similarity, the local gas combination corresponding to the largest combination similarity is defined as the alternative gas combination, and the theoretical unit proportion corresponding to the alternative gas combination is defined as the original unit proportion.

[0106] When there are at least two local gas combinations with the same and largest combination similarity, it means that there are multiple local gas combinations that meet the requirements. Further analysis is required at this time, so they are defined as alternative gas combinations to distinguish different local gas combinations; at the same time, the original unit proportion is defined to identify the theoretical unit proportion corresponding to the alternative gas combination, which facilitates subsequent data analysis.

[0107] Step S401: comparing the candidate gas combination with the local gas combination in the historical interval to determine simulation similarity.

[0108] The simulation similarity is the similarity between the determined alternative gas combination and the local gas combination in the historical interval. The determination method is the same as that of the combination similarity and will not be described here.

[0109] Step S402: defining the theoretical unit proportion corresponding to the local gas combination in the corresponding historical interval when the simulation similarity is greater than the preset reference similarity as the simulation unit proportion.

[0110] The baseline similarity is the minimum simulation similarity set by the staff to determine whether two combinations are highly similar. When the simulation similarity is greater than the baseline similarity, it means that the local gas combination in the historical interval is highly similar to the current alternative gas combination. At this time, the simulation unit ratio is defined to distinguish different data, which is convenient for subsequent analysis.

[0111] Step S403: performing calculations based on the original unit proportions and all corresponding simulated unit proportions to determine an overall deviation value.

[0112] The overall deviation value reflects the deviation between the current original unit ratio and the ratio of all other simulated units. The smaller the value, the more representative the current original unit ratio is of the rest of the simulated unit ratio. The calculation formula is: ,in is the overall deviation value, is the original unit ratio, For the The proportion of simulation units, is the total number of all simulated units.

[0113] Step S404: determining the overall deviation value with the smallest value according to the sorting rule, and defining the candidate gas combination corresponding to the overall deviation value as a similar gas combination.

[0114] The sorting rules can be used to determine the minimum overall deviation value, which means that the original unit proportion is close to the proportion of other simulated units. This indicates that the gas distribution corresponding to the alternative gas combination is relatively stable, and it can be defined as a similar gas combination.

[0115] After the overall deviation value is determined, the waste incinerator flue gas purification method further includes:

[0116] Step S500: Determine whether there are at least two candidate gas combinations with the same and smallest overall deviation values.

[0117] The purpose of the judgment is to find out whether there are multiple candidate gas combinations that meet the requirements, so as to facilitate the subsequent determination of similar gas combinations.

[0118] Step S5001: If there are not at least two candidate gas combinations with the same and smallest overall deviation values, the candidate gas combination corresponding to the smallest overall deviation value is determined as the similar gas combination.

[0119] When there are not at least two alternative gas combinations with the same and smallest overall deviation values, it means that there is only one alternative gas combination that meets the requirements, and in this case, it can be defined as a similar gas combination.

[0120] Step S5002: If there are at least two candidate gas combinations with the same and smallest overall deviation values, the simulation unit proportion corresponding to each candidate gas combination is defined as the determination unit proportion.

[0121] When there are at least two alternative gas combinations with the same and smallest overall deviation values, it means that there are multiple alternative gas combinations that meet the requirements, and further analysis is required. The judgment unit proportion is defined to distinguish different simulation unit proportions for subsequent analysis.

[0122] Step S501 : randomly selecting one determination unit ratio from all determination unit ratios as a standard unit ratio, and defining the remaining determination unit ratios as comparison unit ratios.

[0123] Define the standard unit proportion and the comparison unit proportion to distinguish different judgment unit proportions for easy subsequent analysis.

[0124] Step S502: Calculate the representative deviation value based on the standard unit ratio and all comparison unit ratios, and determine the representative deviation value with the smallest value based on the sorting rule, and define the standard unit ratio corresponding to the representative deviation value as the representative unit ratio.

[0125] The representative deviation value is a numerical value that reflects the feasibility of the determined standard unit proportion representing the proportions of the remaining comparison units. The smaller the value, the more representative it is. The determination method is the same as the above-mentioned overall deviation value and will not be repeated here. The representative deviation value with the smallest value can be determined through the sorting rules, that is, the standard unit proportion determined at this time is most representative of all the judgment unit proportions. At this time, it is defined as the representative unit proportion to achieve the distinction between different judgment unit proportions, which is convenient for subsequent analysis.

[0126] Step S503: performing difference calculation based on the representative unit ratio and the original unit ratio to determine the separated unit ratio, and determining the separated unit ratio with the smallest value according to the sorting rule, and determining the alternative gas combination corresponding to the separated unit ratio as the similar gas combination.

[0127] The separated unit ratio is the difference between the representative unit ratio and the corresponding original unit ratio. The difference is an absolute value. The sorting rule can be used to determine the separated unit ratio with the smallest value. That is, the gas distribution of this alternative gas combination is similar to that of most of the surrounding combinations, that is, the gas distribution is relatively stable. In this case, it can be determined as a similar gas combination.

[0128] After the operation port is determined, the waste incinerator flue gas purification method also includes:

[0129] Step S600: Determine the distance between points based on the ascending vertex and the working opening.

[0130] The distance between points is the distance between the rising top and the working port in the height direction of the absorption tower.

[0131] Step S601: When the distance between the points is less than a preset reference distance, it is determined whether the exhaust port located above the working port and closest to the working port is in an open state.

[0132] The reference separation distance is the maximum distance allowed when two locations are considered close, as set by the staff. When the point separation distance is less than the reference separation distance, it means that the two locations are close. At this time, there may be a gas processing error that has not been processed in time. The purpose of the judgment is to know whether the gas discharge can be delayed.

[0133] Step S6011: If the exhaust port located above the working port and closest to the working port is not in an open state, the currently determined working port is controlled to be open.

[0134] When the exhaust port above the working port and closest to the working port is not open, it means that if the gas is discharged later, it still needs to move a long distance. At this time, the working port can be opened normally to discharge the gas.

[0135] Step S6012: If the exhaust port located above and closest to the working port is in an open state, the exhaust port located above and closest to the working port is updated to a new working port and maintained in an open state.

[0136] When the exhaust port above the working port and closest to the working port is open, the working port can be updated so that the gas is not discharged from the current exhaust port, ensuring that the heat of the gas is not lost in large quantities while improving the stability of the gas deacidification treatment.

[0137] Reference Figure 2 Based on the same inventive concept, an embodiment of the present invention provides a waste incinerator flue gas purification system, comprising:

[0138] An acquisition module is used to obtain the unit flow rate of the flue gas at the inlet of the absorption tower, the unit flow rate of the flue gas, and the characteristic unit flow rate of the characteristic gas, wherein the characteristic gas is an acid gas with a large content in the flue gas;

[0139] A processing module, connected to the acquisition module, for storing and processing information;

[0140] The processing module calculates the characteristic flow rate ratio of each characteristic gas based on the characteristic unit flow rate and the flue gas unit flow rate;

[0141] The processing module combines the characteristic flow ratios to form a local gas combination, and determines the excess flow ratio of the excess gas according to the local gas combination, wherein the excess gas is an acid gas with a smaller content specified in the flue gas;

[0142] The processing module determines the gas distribution combination according to all characteristic flow ratios and excess flow ratios;

[0143] The processing module determines the required processing time corresponding to the gas distribution combination according to the preset processing matching relationship;

[0144] The processing module calculates the smoke rising distance based on the required processing time and the unit flow rate of the smoke, and determines the rising vertex based on the smoke rising distance;

[0145] The processing module defines the exhaust port closest to and above the rising vertex as the operating port, and controls the operating port to open for a preset fixed time after the required processing time.

[0146] An excess flow ratio determination module is used to determine the excess flow ratio of excess gas;

[0147] A combination similarity determination module is used to determine the similarity between two local gas combinations;

[0148] A local gas combination screening module is used to screen multiple local gas combinations that meet the requirements;

[0149] An alternative gas combination screening module is used to screen multiple alternative gas combinations that meet the requirements;

[0150] The operation port control module is used to control the opening of the operation port.

[0151] Those skilled in the art will clearly understand that for the sake of convenience and brevity, the division of the above-mentioned functional modules is only used as an example for illustration. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. The specific working processes of the above-mentioned systems, devices, and units can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0152] An embodiment of the present invention provides a computer-readable storage medium storing a computer program capable of being loaded and executed by a processor for a method for purifying flue gas from a waste incinerator.

[0153] Computer storage media include, for example, various media that can store program codes, such as USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical disks.

Claims

1. A method for purifying flue gas from a garbage incinerator, characterized in that: include: Obtain the unit flow rate, unit flow velocity, and characteristic unit flow rate of the incineration flue gas at the absorption tower inlet, wherein the characteristic gas is an acid gas with a large content specified in the flue gas; Calculate the characteristic flow rate ratio of each characteristic gas based on the characteristic unit flow rate and the flue gas unit flow rate; Combining the characteristic flow rates to form a local gas combination, and determining the excess flow rate ratio of the excess gas according to the local gas combination, wherein the excess gas is an acid gas with a smaller content in the flue gas; Determine the gas distribution combination based on all characteristic flow ratios and excess flow ratios; Determine the required processing time corresponding to the gas distribution combination based on the preset processing matching relationship; Calculate the smoke rising distance based on the required processing time and the unit flow rate of the smoke, and determine the rising peak based on the smoke rising distance; The exhaust port closest to and above the rising vertex is defined as the operating port, and the operating port is controlled to open for a preset fixed time after the demand processing time; The steps of determining the excess flow ratio of excess gas according to the local gas combination include: A historical interval is established on a preset time axis, the latter end of which coincides with the current time point and has a width of a preset historical length, and the local gas composition and alkali solution consumption are obtained in the historical interval; The monomer consumption is determined based on the characteristic flow ratio of each characteristic gas in the local gas combination, and the excess consumption of the excess gas is determined based on the total monomer consumption and the alkali solution consumption; Determine the theoretical unit ratio corresponding to the excess consumption based on the preset ratio matching relationship; Compare the current local gas combination with the local gas combination in the historical interval to determine the combination similarity; The combination similarity with the largest value is determined according to the preset sorting rules, and the local gas combination in the historical interval corresponding to the combination similarity is defined as a similar gas combination, and the theoretical unit ratio corresponding to the similar gas combination is determined as the current excess flow ratio; After the operation port is determined, the waste incinerator flue gas purification method also includes: Determine the distance between points based on the ascending apex and the working opening; When the distance between the points is less than the preset reference distance, it is determined whether the exhaust port located above the working port and closest to the working port is in an open state; If the exhaust port located above the working port and closest to the working port is not open, the currently determined working port is controlled to open; If the exhaust port located above and closest to the working port is in an open state, the exhaust port located above and closest to the working port is updated to a new working port and maintained in an open state.

2. The method for purifying flue gas from a waste incinerator according to claim 1, characterized in that: The steps of comparing the current local gas combination with the local gas combination in the historical interval to determine the combination similarity include: The characteristic flow ratio of the characteristic gas in the local gas combination is summed up and calculated to determine the combined flow ratio; Calculate the difference between the two combined traffic proportions to determine the combined difference proportion; Under the same characteristic gas, the deviation ratio is calculated based on the characteristic flow ratio corresponding to the two local gas combinations; The combination similarity is determined by calculation based on the combination difference ratio, the preset ratio calculation parameters, the deviation ratio, and the preset ratio calculation parameters.

3. The method for purifying flue gas from a waste incinerator according to claim 2, characterized in that: After the combination similarity is determined, the waste incinerator flue gas purification method further includes: Determine whether there are at least two local gas combinations with the same and maximum combination similarity; If there are not at least two local gas combinations with the same and maximum combination similarity, then similar gas combinations are defined based on the local gas combinations corresponding to the maximum combination similarity; If there are at least two local gas combinations with the same and largest combination similarity, the local gas combination corresponding to the largest combination similarity is defined as the alternative gas combination, and the theoretical unit ratio corresponding to the alternative gas combination is defined as the original unit ratio; Compare the candidate gas combinations with the local gas combinations in the historical interval to determine the simulation similarity; The theoretical unit ratio corresponding to the local gas combination in the corresponding historical interval when the simulation similarity is greater than the preset benchmark similarity is defined as the simulation unit ratio; Calculate the overall deviation value based on the original unit proportion and all corresponding simulated unit proportions; The overall deviation value with the smallest value is determined according to the sorting rule, and the alternative gas combination corresponding to the overall deviation value is defined as a similar gas combination.

4. The method for purifying flue gas from a waste incinerator according to claim 3, characterized in that: At After the overall deviation value is determined, the waste incinerator flue gas purification method also includes: Determining whether there are at least two alternative gas combinations with the same and minimum overall deviation values; If there are not at least two alternative gas combinations with the same and smallest overall deviation values, the alternative gas combination corresponding to the smallest overall deviation value is determined as the similar gas combination; If there are at least two alternative gas combinations with the same and smallest overall deviation values, the simulation unit proportion corresponding to each alternative gas combination is defined as the determination unit proportion; Randomly select one judgment unit ratio from all judgment unit ratios as the standard unit ratio, and define the remaining judgment unit ratios as comparison unit ratios; Calculate the representative deviation value based on the standard unit ratio and all comparison unit ratios, and determine the representative deviation value with the smallest value according to the sorting rules, and define the standard unit ratio corresponding to the representative deviation value as the representative unit ratio; The difference between the representative unit ratio and the original unit ratio is calculated to determine the separated unit ratio, and the separated unit ratio with the smallest value is determined according to the sorting rules, and the alternative gas combination corresponding to the separated unit ratio is determined as the similar gas combination.

5. A waste incinerator flue gas purification system, characterized in that: include: An acquisition module is used to obtain the unit flow rate of the flue gas at the inlet of the absorption tower, the unit flow rate of the flue gas, and the characteristic unit flow rate of the characteristic gas, wherein the characteristic gas is an acid gas with a large content in the flue gas; A processing module, connected to the acquisition module, for storing and processing information; The processing module calculates the characteristic flow rate ratio of each characteristic gas based on the characteristic unit flow rate and the flue gas unit flow rate; The processing module combines the characteristic flow rates to form a local gas combination, and determines the excess flow rate ratio of the excess gas according to the local gas combination, wherein the excess gas is an acid gas with a smaller content specified in the flue gas; The processing module determines the gas distribution combination according to all characteristic flow ratios and excess flow ratios; The processing module determines the required processing time corresponding to the gas distribution combination according to the preset processing matching relationship; The processing module calculates the smoke rising distance based on the required processing time and the unit flow rate of the smoke, and determines the rising vertex based on the smoke rising distance; The processing module defines the exhaust port closest to and above the rising vertex as the operating port, and controls the operating port to open for a preset fixed time after the required processing time. The processing module determines the excess flow ratio of the excess gas according to the local gas combination, including: The processing module establishes a historical interval on a preset time axis, the latter end of which coincides with the current time point and has a width of a preset historical length, and obtains the local gas combination and alkali solution consumption in the historical interval; The processing module determines the monomer consumption according to the characteristic flow ratio of each characteristic gas in the local gas combination, and calculates the excess consumption of the excess gas according to the total monomer consumption and the alkali solution consumption; The processing module determines the theoretical unit ratio corresponding to the excess consumption according to the preset ratio matching relationship; The processing module compares the current local gas combination with the local gas combination in the historical interval to determine the combination similarity; The processing module determines the combination similarity with the largest value according to a preset sorting rule, defines the local gas combination in the historical interval corresponding to the combination similarity as a similar gas combination, and determines the theoretical unit ratio corresponding to the similar gas combination as the current excess flow ratio; After the working port is determined, the processing module determines the distance between the points according to the ascending vertex and the working port; When the distance between the points is less than a preset reference distance, the processing module determines whether the exhaust port located above the operation port and closest to the operation port is in an open state; If the exhaust port located above the working port and closest to the working port is not in an open state, the processing module controls the currently determined working port to be open; If the exhaust port located above and closest to the working port is in an open state, the processing module updates the exhaust port located above and closest to the working port to a new working port and maintains the updated exhaust port in an open state.

6. A computer-readable storage medium, characterized in that A computer program is stored which can be loaded by a processor and execute the method according to any one of claims 1 to 4.

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