Method for accounting for volatile organic compound emission of industrial enterprises based on measured data

Abstract

The present application relates to the technical field of volatile organic compounds emission accounting, and particularly relates to an industrial enterprise volatile organic compounds emission accounting method based on measured data, comprising the following steps: step one: measuring organized emission E1; step two: measuring reduction amount of treatment facilities E2; step three: measuring total organized collection amount E3, E3=E1+E2; step four: measuring collection efficiency λ; step five: measuring unorganized emission E4; step six: calculating total VOCs emission E, E=E1+E2+E4. 总 总 Compared with the prior art, the industrial enterprise volatile organic compounds emission accounting method based on measured data provided by the present application mainly calculates the total VOCs emission of a specific enterprise in any period of time including organized and unorganized emissions according to detection data, has the characteristics of unified measurement unit and intuitive judgment of enterprise VOCs treatment effect.​

Description

Technical Field

[0001] This invention relates to the field of volatile organic compound (VOC) emission accounting technology, and in particular to a method for calculating VOC emissions from industrial enterprises based on measured data. Background Technology

[0002] Volatile organic compounds (VOCs) are the main sources of air pollutants PM2.5 and O3, and industrial emissions are one of the main sources of VOC pollution. Accurately determining the VOC emissions of enterprises is crucial for achieving VOC reduction in industrial enterprises. Currently, VOC emissions from industrial enterprises are mainly based on the pollution factor method and the material balance method, both of which have certain shortcomings: the pollution factor method relies mainly on the average pollution factor, which may underestimate or overestimate for specific enterprises and cannot reflect the current status of VOC emissions and control within an enterprise; the material balance method mainly calculates VOC generation at each stage of the enterprise's production and then sums the results. The biggest problem is the inconsistent units of measurement for each stage. For example, VOCs emitted from exhaust stacks are mainly measured by carbon mass, while emissions from the source are mainly measured by the total VOC content (mass). Inconsistent units of measurement mean that they cannot be directly used for calculation.

[0003] Furthermore, in practice, the treatment time for organic waste gases of different elements in VOCs treatment facilities varies greatly. If only the VOCs concentration at the outlet is considered, it will bring a large error to the calculation of organic matter emissions.

[0004] In view of this, the present invention is hereby proposed. Summary of the Invention

[0005] The present invention aims to provide a method for calculating the volatile organic compound (VOC) emissions of industrial enterprises based on measured data, in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] The method for calculating the volatile organic compound (VOC) emissions of industrial enterprises based on measured data includes the following steps:

[0008] Step 1: Measurement of organized emissions E1;

[0009] Step 2: Measurement of the reduction amount E2 from the treatment facilities;

[0010] Step 3: Measure the total amount of organized collection E3, where E3 = E1 + E2;

[0011] Step 4: Measurement of collection efficiency λ;

[0012] Step 5: Measurement of fugitive emissions (E4);

[0013] Step Six: Calculate the total VOCs emissions E 总 E 总 =E1+E2+E4.

[0014] Preferably, in step one, the method for measuring the organized emissions E1 is as follows:

[0015] Collect VOCs concentration C at the end of the exhaust stack i Air volume Q at the end of the exhaust stack under standard conditions i VOCs treatment facility operation time t i The number of exhaust pipes, n;

[0016]

[0017] Preferably, in step two, the method for measuring the reduction E2 of the treatment facilities is as follows:

[0018] Collect the concentration C at the inlet section of the VOCs treatment facility in VOCs treatment facility outlet concentration C out VOCs treatment facility inlet air volume Q in VOCs treatment facility outlet air volume Q out VOCs treatment facility operation time t i The number of treatment facilities is n';

[0019]

[0020] Preferably, it is characterized in that:

[0021] In step four, the method for measuring the collection efficiency λ is as follows:

[0022] A marker of a quantitative value of E' is released into the equipment, and then the organized emission of the marker E1' and the reduction of the marker by the treatment facility E2' are measured.

[0023] λ = (E2' + E1') / E';

[0024] In step five, the method for measuring fugitive emissions E4 is as follows:

[0025] E4 = E3 / λ × (1-λ).

[0026] Preferably, the method for measuring organized emissions E1 further includes E1 error correction, wherein the E1 error correction method is as follows:

[0027] Under different flow rates, the processing time of various elemental markers in the equipment was measured to obtain flow rate-time curve models of various elemental markers;

[0028] According to the concentration K of various organic waste gases at the inlet section of the VOCs treatment facility in By combining the flow rate-time curve models of various element markers, the organic waste gas concentrations K of various elements at the outlet of the VOCs treatment facility were obtained. out The total organic waste gas concentration K at the outlet of the VOCs treatment facility is obtained by summing the concentrations of various organic waste gases. out ;

[0029] Based on the total organic waste gas concentration K out The corrected organized emissions E1 are obtained.

[0030] Preferably, the organic waste gas of each element includes at least carbon organic waste gas, nitrogen organic waste gas, sulfur organic waste gas, and phosphorus organic waste gas.

[0031] Compared with existing technologies, the present invention provides a method for calculating the volatile organic compound (VOC) emissions of industrial enterprises based on measured data. This method primarily calculates the total VOC emissions (including both organized and unorganized emissions) of a specific enterprise at any given time by working backward from the measured data. It features unified units of measurement and the ability to intuitively assess the effectiveness of VOC treatment. Furthermore, in this invention, the treatment time of various elemental markers within the equipment is measured under different flow rates. The flow rate-time curve model of these elemental markers is then used to calculate the total organic waste gas concentration K at the outlet of the actual VOC treatment facility. out This error correction method can accurately calculate the total organic waste gas concentration at the outlet, enabling precise accounting of the enterprise's VOCs emissions. Detailed Implementation

[0032] The technical solution of the present invention will be further described below with reference to the embodiments.

[0033] The method for calculating the volatile organic compound (VOC) emissions of industrial enterprises based on measured data includes the following steps:

[0034] Step 1: Measurement of organized emissions E1;

[0035] Step 2: Measurement of the reduction amount E2 from the treatment facilities;

[0036] Step 3: Measure the total amount of organized collection E3, where E3 = E1 + E2;

[0037] Step 4: Measurement of collection efficiency λ;

[0038] Step 5: Measurement of fugitive emissions (E4);

[0039] Step Six: Calculate the total VOCs emissions E 总 E 总 =E1+E2+E4.

[0040] Preferably, in step one, the method for measuring the organized emissions E1 is as follows:

[0041] Collect VOCs concentration C at the end of the exhaust stack i Air volume Q at the end of the exhaust stack under standard conditions i VOCs treatment facility operation time t i The number of exhaust pipes, n;

[0042]

[0043] Preferably, in step two, the method for measuring the reduction E2 of the treatment facilities is as follows:

[0044] Collect the concentration C at the inlet section of the VOCs treatment facility in VOCs treatment facility outlet concentration C out VOCs treatment facility inlet air volume Q in VOCs treatment facility outlet air volume Q out VOCs treatment facility operation time t i The number of treatment facilities is n';

[0045]

[0046] Preferably, it is characterized in that:

[0047] In step four, the method for measuring the collection efficiency λ is as follows:

[0048] A marker of a quantitative value of E' is released into the equipment, and then the organized emission of the marker E1' and the reduction of the marker by the treatment facility E2' are measured.

[0049] λ = (E2' + E1') / E';

[0050] In step five, the method for measuring fugitive emissions E4 is as follows:

[0051] E4 = E3 / λ × (1-λ).

[0052] Preferably, the method for measuring organized emissions E1 further includes E1 error correction, wherein the E1 error correction method is as follows:

[0053] Under different flow rates, the processing time of various elemental markers in the equipment was measured to obtain flow rate-time curve models of various elemental markers;

[0054] According to the concentration K of various organic waste gases at the inlet section of the VOCs treatment facility inBy combining the flow rate-time curve models of various element markers, the organic waste gas concentrations K of various elements at the outlet of the VOCs treatment facility were obtained. out The total organic waste gas concentration K at the outlet of the VOCs treatment facility is obtained by summing the concentrations of various organic waste gases. out ;

[0055] Based on the total organic waste gas concentration K out The corrected organized emissions E1 are obtained.

[0056] Preferably, the organic waste gas of each element includes at least carbon organic waste gas, nitrogen organic waste gas, sulfur organic waste gas, and phosphorus organic waste gas.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not change the essence of the corresponding technical solutions.

Claims

1. A method for calculating the volatile organic compound (VOC) emissions of industrial enterprises based on measured data, characterized in that... It includes the following steps: Step 1: Measurement of organized emissions E1; The method for measuring the organized emissions E1 is as follows: Collect VOCs concentration C at the end of the exhaust stack. i Air volume Q at the end of the exhaust stack under standard conditions i VOCs treatment facility operation time t i The number of exhaust pipes, n; ； Furthermore, the organized emission E1 measurement method also includes E1 error correction. The E1 error correction method involves measuring the treatment time of various elemental markers within the equipment under different flow rates to obtain flow rate-time curve models for each elemental marker; and then, based on the organic waste gas concentration K of various elements at the inlet section of the VOCs treatment facility... in By combining the flow velocity-time curve models of various element markers, the organic waste gas concentrations K of various elements at the outlet of the VOCs treatment facility were obtained. out The total organic waste gas concentration K at the outlet of the VOCs treatment facility is obtained by summing the concentrations of various organic waste gases. out According to the total organic waste gas concentration K out The corrected organized emissions E1 are obtained; Step 2: Measurement of the reduction amount E2 from the treatment facilities; The method for measuring the reduction E2 of the treatment facility is as follows: Collect the concentration C at the inlet section of the VOCs treatment facility. in VOCs treatment facility outlet concentration C out VOCs treatment facility inlet air volume Q in VOCs treatment facility outlet air volume Q out VOCs treatment facility operation time t i The number of treatment facilities is n'; ； Step 3: Measure the total amount of organized collection E3, where E3 = E1 + E2; Step 4: Measurement of collection efficiency λ; The collection efficiency λ is measured as follows: A quantitative amount of marker E' is released into the equipment, and then the organized emission of the marker E1' and the reduction of the marker by the treatment facility E2' are measured; λ = (E2' + E1') / E'; Step 5: Measurement of fugitive emissions (E4); The method for measuring fugitive emissions E4 is: E4 = E3 / λ × (1-λ); Step Six: Calculate the total VOC emissions E 总 E 总 =E1+E2+E4.

2. The method for calculating volatile organic compound (VOC) emissions from industrial enterprises based on measured data according to claim 1, characterized in that: The organic waste gas of the various elements mentioned includes at least organic waste gas of carbon, organic waste gas of nitrogen, organic waste gas of sulfur, and organic waste gas of phosphorus.

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