CN113065100A - Carbon emission accounting method and system for coal-to-synthesis ammonia and methanol - Google Patents
Carbon emission accounting method and system for coal-to-synthesis ammonia and methanol Download PDFInfo
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Abstract
The invention provides a carbon emission accounting method and system for coal-based synthetic ammonia and methanol, wherein the process of preparing the synthetic ammonia and the methanol from the coal comprises the step of converting raw material carbon into CO and H2Gasification reaction of CO to H2The shift reaction, ammonia synthesis reaction and methanol synthesis reaction of (1), wherein the carbon emission accounting method comprises the following steps: collecting activity level data required for carbon emission accounting; respectively calculating H according to the activity level data2CO and (CO + H)2) Carbon emission factors of three gases of the synthesis gas; according to said H2CO and (CO + H)2) Carbon emission factor of the synthesis gas, and the total carbon emission calculated by power consumption and heat. The carbon emission accounting method of the invention can be used for the H with delivery2、CO、(CO+H2) The carbon emission accounting of the ammonia and methanol synthesis device is more accurate.
Description
Technical Field
The invention relates to the technical field of carbon emission accounting, in particular to a carbon emission accounting method and system for coal-based synthetic ammonia and methanol.
Background
With global warming, greenhouse gas emission of carbon dioxide has attracted people's extensive attention, and the coal chemical industry is a key industry of high greenhouse gas emission. Aiming at key industries, a series of carbon emission accounting methods and emission standards are also published in China. However, the accounting method published by the country is a systematic accounting method which is deficient in carbon emission of each link in the enterprise as a whole, and with the rapid development of the industry, one enterprise generally comprises a plurality of production chains, and at the moment, a large error exists in calculation according to the national standard, so that imbalance of carbon emission is caused.
For example, in an enterprise for synthesizing ammonia from coal, currently, devices for synthesizing ammonia and methanol from coal mainly include: a pure ammonia synthesis device and a pure methanol synthesis device; a synthetic ammonia and methanol combined device; with delivery H2、CO、(CO+H2) The device for synthesizing ammonia and methanol. The national standard adopted by the accounting of the emission of the synthetic ammonia and the methanol carbon is the part 10 of the accounting and reporting requirements of the emission of greenhouse gases: chemical industry manufacturers (GB/T32151.10-2015), the standard is to calculate the carbon emission of enterprises by adopting an energy consumption allocation method, the method is to calculate the whole carbon emission of the enterprises, and the difference of the carbon emission of the synthetic ammonia and the carbon emission of the methanol under different production modes cannot be reflected.
Under different production modes, carbon emission of synthetic ammonia and methanol is greatly different, carbon emission of a pure synthetic ammonia and methanol production device is the highest, and enterprises with downstream chemical products have carbon emission of raw material gas H consumed by the downstream products2、CO、(CO+H2) The amount of feed gas H to be consumed by the downstream product2、CO、(CO+H2) The more the amount is, the lower the carbon emission intensity of the synthetic ammonia and methanol is. This means that to reduce carbon emissions from the enterprise, the product chain is extended. Therefore, in order to produce products with higher added values to improve the profit of enterprises and reduce the carbon emission of the enterprises, the number of pure ammonia and methanol synthesis devices is reduced, and the extension of product chains and the diversification of products are developed. Namely H to be generated from a gasification platform of a device for synthesizing ammonia and methanol2CO and (CO + H)2) And separating a part of the gas to produce other chemical products, such as adipic acid, ethylene glycol, butanol and octanol.
At present, no matter enterprises or related institutions, carbon emission is basically accounted according to an energy consumption apportionment mode, and the method does not consider the difference of carbon emission of each procedure under different production modes, so that the carbon emission accounted according to the method has errors and cannot meet the requirement of carbon quantity balance proposed in national standards; for enterprises which develop in a diversified manner and synthesize ammonia and methanol, the carbon emission of downstream chemical products of the enterprises which develop in a diversified manner lacks a specific and accurate calculation method, so that the error of carbon emission calculation of the enterprises which develop in a diversified manner is larger, and sometimes the carbon emission calculated by calculation even exceeds the carbon emission generated by the carbon content in coal; the carbon emission values of the synthetic ammonia and the methanol of enterprises with different production modes are different by times, and the national establishment of the reference values of the carbon emission of the synthetic ammonia and the methanol is not facilitated.
The research on each link of the production process of synthesizing ammonia and methanol from coal finds that the error of calculating carbon emission by an energy consumption allocation method mainly comes from H2Because there are two different sources of H in the production process2One is H produced by gasification reaction2One is H produced by the shift reaction of CO2And H produced by the shift reaction2The carbon emission of (A) is about gasification H2About twice as much. Two different kinds of H in actual production2Is mixed together to produce synthetic ammonia and methanol. And in different production modes, gasifying H2And transformation H2The carbon emissions of the produced synthetic ammonia and methanol are different. Thus, CO shifts to H2The proportion (change rate) of the total amount of CO directly influences the size of a carbon emission factor of hydrogen and then influences the carbon emission intensity of synthetic ammonia and methanol, and an energy consumption allocation method cannot reflect the influence of the change rate, so that the carbon emission intensity calculated by the method has larger errors. Therefore, finding out the relationship between the carbon emission of the synthetic ammonia and the methanol and the conversion rate has important significance for correctly calculating the carbon emission in the production process of the synthetic ammonia and the methanol.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a calculation method for synthesizing ammonia and methanol from coalMethod and system for resolving outgoing H2CO and (CO + H)2) The carbon emission accounting error of the device for synthesizing ammonia and methanol by the synthesis gas is large.
In order to achieve the above objects and other related objects, the present invention provides a method and a system for accounting carbon emission of ammonia and methanol synthesized from coal, wherein the process of producing ammonia and methanol from coal comprises converting raw material carbon into CO and H2Gasification reaction of CO to H2The shift reaction, ammonia synthesis reaction and methanol synthesis reaction of (1), wherein the carbon emission accounting method at least comprises the following steps:
collecting activity level data required for carbon emission accounting;
respectively calculating H according to the activity level data2CO and (CO + H)2) Carbon emission factors of three gases of the synthesis gas;
according to said H2CO and (CO + H)2) And (4) calculating the total carbon emission amount by using carbon emission factors of three gases of the synthesis gas, power consumption and heat.
In an embodiment of the present invention, the activity level data includes: the consumption of raw material coal; the carbon content of the feed coal; analysis data of components in the syngas; delivery H2CO and (CO + H)2) The gas quantity of the synthesis gas; the amount of gas consumed by each ton of synthetic ammonia and methanol; power and thermal consumption data; and the yield of synthetic ammonia and methanol.
In an embodiment of the invention, the activity level data is obtained through production records and production monthly report data of enterprises.
In an embodiment of the present invention, the H2The carbon emission factor of (A) is H in the gasification reaction2Carbon emission factor and H in the shift reaction2A weighted average of the carbon emission factors.
In an embodiment of the present invention, the H is calculated2CO and (CO + H)2) The carbon emission factors of three gases of the synthesis gas include:
calculating (CO + H) according to the gasification reaction and a carbonaceous mass balance method2) Carbon emission factor of syngas;
according to the (CO + H)2) Carbon emission factor calculation of syngas H2Carbon emission factors shared by CO in the gasification process;
calculating H in the shift process from the shift reaction2Carbon emission factor of (a);
h in the gasification step2Carbon emission factor and H in shift process2Weighted average of the carbon emission factors to obtain H2The carbon emission factor of (1).
In an embodiment of the present invention, the H2CO and (CO + H)2) The carbon emission factor of the synthesis gas is calculated by the following formula:
EF(CO+H2)＝(m1×ε-m2)×44÷12；
EFh2 transformation＝EFCO+1.9643；
In the formula, EF(CO+H2)Represents (CO + H)2) Carbon emission factor of syngas in tCO2/KNm3；m1Representing the amount of carbon consumed per unit of synthesis gas produced; ε represents the carbon conversion; m is2Represents the carbon content per synthesis gas; EFCORepresents a carbon emission factor of CO; kCORepresenting the CO split coefficient; a represents the CO content in the synthesis gas; EFH2 gasificationIndicates H in the gasification step2Carbon emission factor of (a); kH2Represents H2The partition coefficient of (a); b represents H in the synthesis gas2Content (c); EFH2 transformationH in the representation conversion step2Carbon emission factor of (a); EFH2 averageRepresents H2A weighted average of carbon emission factors in the gasification process and the shift process; vGasification ofRepresenting H in the gasification syngas2The quantity of (B) is KNm3；VTransformation ofRepresents H obtained by CO conversion2The quantity of (B) is KNm3。
In an embodiment of the present invention, the total amount of carbon emissions includes the amount of carbon emissions generated by synthetic ammonia, methanol-consuming raw materials, electricity, and heat.
In an embodiment of the present invention, the apportionment ratio of the synthetic ammonia to the methanol when calculating the carbon emission amount generated by the power consumption is 1: 0.8.
In one embodiment of the present invention, the apportionment ratio of the synthetic ammonia to the methanol is 1: 1.06 when the carbon emission from the heat consumption is calculated.
A second aspect of the present invention provides an accounting system of a carbon emission accounting method, including:
an input unit for inputting activity level data required for carbon emission accounting;
the accounting unit is used for calculating the carbon emission of each link according to the activity level data required by the carbon emission accounting input by the input unit, and a calculation model of the accounting unit is obtained according to the carbon emission accounting method; and
and the output unit is used for outputting the calculation result of the accounting unit.
As described above, the present invention utilizes H2CO and (CO + H)2) The carbon emission data of the synthetic ammonia and the methanol calculated by the carbon emission factor of the synthetic gas is more accurate compared with an energy consumption apportionment method, because the energy consumption is apportioned by H2The energy consumption split ratio of CO is the same, however, H2The carbon emission of CO in the production process is about 2-2.5 times different, and the difference is not reflected in the energy consumption apportionment method, but the invention utilizes H2CO and (CO + H)2) Carbon emission factor calculation of syngas carbon emission amount the difference in carbon emission amount is calculated, therefore the accounting method of the present invention is further improvedThe addition is accurate.
The carbon emission accounting method of the invention accounts for H generated by gasification reaction2With H produced by shift reaction2Respectively, and taking the weighted average of the two as H in the production process2The carbon emission factor is used for calculating the carbon emission of the synthetic ammonia and the methanol, and the change of CO into H is fully reflected2The carbon emission is more accurately accounted due to the influence of the change rate on the carbon emission.
The invention calculates H2CO and (CO + H)2) The carbon emission factor of the synthesis gas can accurately calculate the carbon emission quantity of the synthesis ammonia and the methanol for enterprises of synthesis ammonia and methanol in various production modes, and brings convenience for the carbon emission calculation of chemical products related to the enterprises, such as adipic acid, ethylene glycol, butanol and octanol; because of H2CO and (CO + H)2) The synthesis gas is a production raw material of the chemical products, but the gas distributes a part of carbon emission, and if the part of carbon emission is not distributed to the related chemical products, the carbon emission data of the related chemical products cannot be accurately calculated, and the carbon emission balance of the whole enterprise is influenced.
The invention can accurately calculate the carbon emission intensity of the synthetic ammonia and the methanol in detail for all the existing synthetic ammonia and methanol devices no matter how long the product chain is and how many diversified products are, and has wide application range and accurate calculation.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and not to be construed as limiting the invention in any way, and in which:
fig. 1 is a schematic flow chart of the carbon emission accounting method for synthesizing ammonia and methanol from coal according to the present invention.
Fig. 2 is a schematic flow chart of a method for calculating the carbon emission factor in fig. 1.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. It is also to be understood that the terminology used in the examples is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present invention. Test methods in which specific conditions are not specified in the following examples are generally carried out under conventional conditions or under conditions recommended by the respective manufacturers.
When numerical ranges are given in the examples, it is understood that both endpoints of each of the numerical ranges and any value therebetween can be selected unless the invention otherwise indicated. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs and the description of the present invention, and any methods, apparatuses, and materials similar or equivalent to those described in the examples of the present invention may be used to practice the present invention.
The invention utilizes H2CO and (CO + H)2) The carbon emission factor of the synthesis gas accounts for the carbon emission of the synthetic ammonia and the methanol, and the accounting is more convenient and accurate.
The production process of synthetic ammonia and methanol from coal includes the conversion of carbon material into CO and H2Gasification reaction of CO to H2The shift reaction, ammonia synthesis reaction and methanol synthesis reaction, and the involved chemical reactions comprise:
and (3) gasification reaction: c + H2O+O2→CO+H2+CO2 (1)；
And (3) shift reaction: CO + H2O→H2+CO2 (2)；
Ammonia synthesis reaction: h2+N2→NH3 (3)；
Methanol synthesis reaction: CO + H2→CH3OH (4)；
Referring to fig. 1, the carbon emission accounting method of the present invention at least includes the following steps:
s1, collecting activity level data required by carbon emission accounting;
s2, respectively calculating H according to the activity level data2CO and (CO + H)2) Carbon emission factor of syngas;
s3, by the H2CO and (CO + H)2) Carbon emission factor of the synthesis gas, and the total carbon emission calculated by power consumption and heat.
Specifically, the activity level data required for the carbon emission accounting in step S1 includes: (1) the consumption of the raw material coal is recorded as M; (2) the carbon content of the raw material coal is marked as x; (3) analysis of composition of syngas, i.e. CO and H in syngas2The occupied proportions are respectively recorded as A, B; (4) delivery H2、CO、(CO+H2) The gas quantities of the synthesis gas are respectively denoted as VH2 delivery、VCO delivery outsideAnd V(H2+ CO) delivery(ii) a (5) The gas consumption per ton of synthetic ammonia and methanol, including the nitrogen-hydrogen synthetic gas consumed by synthetic ammonia is marked as V1: (H2+N2) (CO + H) consumed in the synthesis of methanol2) Syngas V2(CO+H2)And H consumed2Is marked as V2H2(ii) a (6) The power and heat consumption data are respectively recorded as S and Y; (7) the yields of synthetic ammonia and methanol are respectively recorded as W1 and W2, and the activity level data required by the carbon emission accounting can be acquired through production records, production monthly reports and other data of enterprises.
Specifically, step S2 referring to FIG. 2, calculate H2CO and (CO + H)2) The carbon emission factors of three gases of the synthesis gas include:
s21, calculating (CO + H) according to the gasification reaction and the carbonaceous weight balance method2) Carbon emission factor of syngas;
s22, according to the (CO + H)2) Carbon emission factor calculation of syngas H2Carbon emission factors shared by CO in the gasification process;
s23, calculating H in the conversion step according to the reaction formula of the conversion step2Carbon emission factor ofA seed;
s24, H in gasification step2Carbon emission factor and H in shift process2Weighted average of the carbon emission factors to obtain H2The carbon emission factor of (1).
Wherein, step S21 is to calculate the synthesis gas (CO + H) according to the gasification reaction formula (1) and the carbonaceous balance method2) Carbon emission factor of, i.e. EF(CO+H2)＝(m1×ε-m2)×44÷12 (5)；
In the formula, EF(CO+H2)Represents (CO + H)2) Carbon emission factor of syngas in tCO2/KNm3；m1Representing the amount of carbon consumed to produce a unit of syngas; ε represents the carbon conversion; m is2Represents the carbon content per synthesis gas; the value of epsilon is related to a gasification furnace used in the production process, for example, epsilon can be 0.98; 44 is CO212 is the molar mass of C.
From equation (5), the calculation of EF(CO+H2)M needs to be calculated first1And m2：
m1＝M÷VTotal (CO + H2)×β (6)；
In the formula (6), β represents the carbon content of the raw material coal used for production, and the value thereof can be obtained by recording the raw material purchased by enterprises, for example, 70.38% can be taken.
No matter how much CO and H are separated2、(CO+H2) The total volume of synthesis gas and gas was constant. From this, the synthesis gas (CO + H) was calculated2) Total yield is the amount of export gas + the amount of ammonia synthesis and methanol consumption gas: i.e. VTotal (CO + H2)＝VH2 delivery+VCO delivery outside+V(H2+ CO) delivery+V1H2×W1+(V2H2+V2CO+H2) xW 2 (7); v1 in formula (7)H2H representing unit consumption of synthetic ammonia2The volume number of (b) is determined by the nitrogen-hydrogen ratio in ammonia synthesis and V1: (H2+N2) It is found that m can be calculated by substituting formula (7) into formula (6) when the nitrogen-hydrogen ratio is 1: 2.8 in actual production1。
The carbon content (1000/22.4) × 28 × 0.4286 ═ 0 in CO gas.5358tC/KNm3；
(CO+H2) Carbon content m in synthetic gas2＝(0.5358×A)tC/KNm3 (8)；
Substituting the formulas (6) to (8) into the formula (5) to obtain the synthesis gas (CO + H)2) Carbon emission factor EF(CO+H2)。
Step S22 calculates H2And H in the synthesis gas when the CO is used as a carbon emission factor for the gasification process2The CO proportion is the carbon emission sharing coefficient of the gasification process according to the gasification formula (1) and CO and H in the synthesis gas2The ratio of A, B can obtain the carbon emission factor EF of COCOAnd H2Carbon emission factor EF in gasification processH2 gasification：
In the formula, KCORepresenting the CO split coefficient; kH2Represents H2The partition coefficient of (a); the actual production split coefficient is equal to the content of gas in the synthesis gas.
Step S23 calculates H2Calculating H according to the conversion equation (2) based on the amount of gas introduced into the conversion process in the conversion of the carbon emission factor in the conversion process2Carbon emission factor in the shift procedure:
EFh2 transformation＝EFCO+1.9643 (11)；
Wherein 1.9643 is CO2Volume to mass conversion factor, equal to 44 ÷ 22.4.
Step S24 calculating H in the whole production process2Carbon emission factor EFH2 averageThrough EFH2 gasificationAnd EFH2 transformationThe weighted average yields:
in the formula, VGasification ofRepresenting H in the gasification syngas2The quantity of (B) is KNm3；VTransformation ofRepresents H obtained by CO conversion2The quantity of (B) is KNm3。
To calculate VGasification ofAnd VTransformation ofNeeds to calculate H first2Total yield V ofTotal H2，H2Total yield H consumption of synthetic ammonia2Quantity + quantity of methanol-consuming Hydrogen + delivery H2The quantity, namely:
Vtotal H2＝V1H2×W1+V2H2×W2+VH2 delivery (13)；
VGasification of＝[VTotal (CO + H2)-VH2 delivery-V2(CO+H2)×W2]×B (14)；
V is obtained by subtracting the formula (14) from the formula (13)Transformation of＝VTotal H2-VGasification of (15)；
Substituting the formula (14) and the formula (15) into the formula (12) to obtain EFH2 average。
Step S3 calculates the total carbon emissions of ammonia and methanol synthesized from coal, and the total carbon emissions include carbon emissions generated by power consumption and carbon emissions generated by heat consumption in addition to carbon emissions generated by raw material consumption.
Total carbon emission E ═ Q1×W1+Q2×W2 (16)；
In the formula, Q1Represents the carbon emission per unit of synthetic ammonia product, Q2Represents the carbon emission per unit of methanol product; the carbon emission per unit of synthetic ammonia and methanol includes carbon emission generated by raw materials consumed by synthetic unit products and carbon emission generated by electricity and heat consumed by synthetic unit products, i.e. Q1＝q1+s1+y1(17)；Q2＝q2+s2+y2 (18)；
In the formula, q1Represents the amount of carbon emission, s, consumed per unit of raw material for ammonia synthesis1Carbon emission amount, y, representing power consumption per synthetic ammonia1Representing unit of synthetic ammoniaCarbon emissions from thermal power consumption; q. q.s2Represents the carbon emission per unit of methanol consumption of the feedstock, s2Carbon emission amount, y, representing power consumption per unit methanol2Representing the carbon emissions per thermal consumption of methanol.
And q is1＝EFH2 average×V1H2 (19)；
q2＝EFH2 average×V2H2+EF(CO+H2)×V(CO+H2) (20)；
Due to separation of H2CO has various technological processes, and H is separated by the CO2The electricity and steam of CO are difficult to separate from the electricity and steam for synthesizing ammonia and methanol production, so that H is separated2CO and (CO + H)2) The consumed electricity and steam are not included in the carbon emission calculation range.
Calculation of split data of various gases sent out on electricity and steam: and carrying out weighted average according to the number of the synthetic ammonia and methanol consumed synthetic gas to obtain the average number of the total ammonia consumed synthetic gas, and distributing the total ammonia consumption and the steam consumption according to the average number. The specific calculation is as follows:
average number of total ammonia consumed syngas VAverage＝[V1H2×W1+(V2(CO+H2)+V2H2)×W2)]÷(W1+W2)(21)；
Unit total ammonia consumption S ═ S ÷ (W1+ W2) (22);
steam consumption per total ammonia Y ═ Y ÷ (W1+ W2) (23);
electric quantity S of delivered gasDelivery of drugs＝(VH2 delivery+VCO delivery outside+V(H2+ CO) delivery)×s÷VAverage (24)；
Distributing steam Y for outgoing gasDelivery of drugs＝(VH2 delivery+VCO delivery outside+V(H2+ CO) delivery)×y÷VAverage (25)；
The net power consumption S for productionNet consumption＝S-SDelivery of drugs (26)；
Net steam consumption Y for productionNet consumption＝Y-YDelivery of drugs (27)；
Known power stripThe amplification factor is 0.8843 (tCO)2MWh) and a steam emission factor of 117 (tCO)2TJ); the electric power is divided into synthetic ammonia and methanol in the ratio of 1 to 0.8; the steam is distributed according to the ratio of synthetic ammonia to methanol of 1: 1.06.
Then s1＝SNet consumption÷(W1+0.8×W2)×0.8843 (28)；
y1＝YNet consumption÷(W1+1.06×W2)×0.8843 (29)；
s2＝s1×0.8 (30)；
y2＝y1×1.06 (31)；
Q can be obtained by substituting equations (28) and (29) into equation (17)1(ii) a Q can be obtained by substituting equations (30) and (31) into equation (18)2(ii) a And substituting Q1 and Q2 into formula (16) to calculate the total carbon emission E.
The carbon emission accounting method is used for calculating H2The carbon emission factor of (A) is determined by H in the gasification process2Carbon emission factor and H in shift process2Is calculated by taking into account the weighted average of the carbon emission factors of (a) and (b), the calculation method fully takes into account the different production modes (H in the gasification process and the shift process)2In different proportions) H2The carbon emission accounting method of the invention is more accurate. Because of different production modes, gasifying H2And transformation H2The carbon emissions of the produced synthetic ammonia and methanol are different. The accounting method of the invention defines H2Carbon emissions and conversion rate (CO to H)2The amount of the carbon dioxide accounts for the total amount of the gasified CO), and establishing a corresponding relational expression, and calculating the carbon emission under different production modes according to the relational expression.
The invention also provides a carbon emission accounting system, which comprises an input unit, an accounting unit and an output unit, wherein the input unit is used for inputting activity level data required by carbon emission accounting, the accounting unit is used for calculating the carbon emission of each link according to the activity level data input by the input unit, the accounting unit is a calculation model established according to the accounting method of the invention, and the output unit is used for outputting the accounting result of the accounting unit. The carbon emission accounting system can be used for single-chain or multi-chain carbon emission accounting of ammonia synthesis enterprises, the accounting is convenient and quick, the accounting result is more accurate, and the error is within 1%.
In summary, the invention provides a carbon emission accounting method for coal-to-ammonia and methanol synthesis, which utilizes H2、CO、(CO+H2) The carbon emission data of the synthetic ammonia and the methanol obtained by calculating the carbon emission factor of the synthetic gas is more accurate compared with an energy consumption allocation method, and the method can be applied to carbon accounting of diversified products, and is wide in application range and accurate in accounting. The carbon accounting method provided by the invention is used for establishing the accounting model and the accounting system comprising the accounting model, so that the carbon emission of the coal-to-ammonia synthesis enterprise can be quickly and accurately accounted. Therefore, the invention effectively overcomes some practical problems in the prior art, thereby having high utilization value and use significance.
The foregoing embodiments are merely illustrative of the principles of this invention and its efficacy, rather than limiting it, and various modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the invention, which is defined in the appended claims.
Claims (10)
1. A carbon emission accounting method for preparing synthetic ammonia and methanol from coal comprises the step of converting raw material carbon into CO and H2Gasification reaction of CO to H2The shift reaction, ammonia synthesis reaction and methanol synthesis reaction of (a), wherein the carbon emission accounting method comprises the steps of:
collecting activity level data required for carbon emission accounting;
respectively calculating H according to the activity level data2CO and CO + H2Carbon emission factors of three gases of the synthesis gas;
according to said H2CO and CO + H2And (4) calculating the total carbon emission amount by using carbon emission factors of three gases of the synthesis gas, power consumption and heat.
2. The carbon emission accounting method of claim 1, wherein the activity level data comprises: the consumption of raw material coal; the carbon content of the feed coal; analysis data of components in the syngas; delivery H2CO and CO + H2The gas quantity of the synthesis gas; the amount of gas consumed by each ton of synthetic ammonia and methanol; power and thermal consumption data; and the yield of synthetic ammonia and methanol.
3. The carbon emission accounting method of claim 1, wherein the activity level data is obtained from production records and monthly production data of an enterprise.
4. The carbon emission accounting method of claim 1, wherein the H2The carbon emission factor of (A) is H in the gasification reaction2Carbon emission factor and H in the shift reaction2A weighted average of the carbon emission factors.
5. The carbon emission accounting method of claim 4, wherein the H is calculated2CO and CO + H2The carbon emission factors of three gases of the synthesis gas include:
calculating CO + H according to the gasification reaction and a carbonaceous mass balance method2Carbon emission factor of syngas;
according to the CO + H2Carbon emission factor calculation of syngas H2Carbon emission factors shared by CO in the gasification process;
calculating H in the shift process from the shift reaction2Carbon emission factor of (a);
h in the gasification step2Carbon emission factor and H in shift process2Weighted average of the carbon emission factors to obtain H2The carbon emission factor of (1).
6. The carbon emission accounting method of claim 5, wherein the H2CO and CO + H2The carbon emission factor of the syngas is calculated by the following formula:
EF(CO+H2)＝(m1×ε-m2)×44÷12；
EFh2 transformation＝EFCO+1.9643；
In the formula, EF(CO+H2)Represents CO + H2Carbon emission factor of syngas in tCO2/KNm3；m1Representing the amount of carbon consumed per unit of synthesis gas produced; ε represents the carbon conversion; m is2Represents the carbon content per synthesis gas; EFCORepresents a carbon emission factor of CO; kCORepresenting the CO split coefficient; a represents the content of CO in the synthesis gas; EFH2 gasificationIndicates H in the gasification step2Carbon emission factor of (a); kH2Represents H2The partition coefficient of (a); b represents H in the synthesis gas2The content of (A); EFH2 transformationH in the representation conversion step2Carbon emission factor of (a); EFH2 averageRepresents H2A weighted average of carbon emission factors in the gasification process and the shift process; vGasification ofRepresenting H in the gasification syngas2The quantity of (B) is KNm3；VTransformation ofRepresents H obtained by CO conversion2The quantity of (B) is KNm3。
7. The method of any one of claims 1 to 6, wherein the total amount of carbon emissions includes ammonia synthesis, carbon emissions from methanol-consuming raw materials, carbon emissions from electricity generation, and carbon emissions from thermal generation.
8. The method of claim 7, wherein the apportionment ratio of the synthetic ammonia to the methanol is 1: 0.8 when calculating the amount of carbon emissions generated by consuming electric power.
9. The method of claim 7, wherein the apportionment ratio of synthetic ammonia to methanol in the calculation of the amount of carbon emissions consumed for thermal power generation is 1: 1.06.
10. A carbon emissions accounting system, comprising:
an input unit for inputting activity level data required for carbon emission accounting;
an accounting unit, which calculates the carbon emission of each link according to the activity level data required by the carbon emission accounting input by the input unit, wherein the calculation model of the accounting unit is obtained according to the carbon emission accounting method of any one of claims 1 to 9; and
and the output unit is used for outputting the calculation result of the accounting unit.
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