Cement production carbon emission calculation method considering uncertainty factors

Abstract

The invention discloses a cement production carbon emission calculation method considering uncertainty factors, and relates to the technical field of industrial carbon emission measurement. The method comprises the following steps: calculating carbon emission generated by a raw material in a calcining process of cement production; performing fitting prediction on uncertain factors in the complex calcining process to obtain parameter values of kiln surface radiation heat dissipation; carbon emission generated by fuel combustion in the calcining process of cement production is calculated according to the parameter value of kiln surface heat dissipation; and calculating the carbon emission used by electric power in the grinding process of cement production, and further calculating the carbon emission of cement production. When the carbon emission of the raw material is calculated, the influence of non-carbonate calcium oxide and organic impurities on the calculation of the carbon emission is considered besides conventional carbonate decomposition, and the problem that uncertain factors are difficult to evaluate is solved when the carbon emission caused by fuel combustion is calculated, so that the final calculation result is more accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial carbon emission measurement, and in particular to a method for calculating carbon emission from cement production taking uncertainty factors into consideration. Background Art

[0002] The raw materials of cement clinker are mainly limestone, sandstone, clay, slag, etc. The preparation unit grinds and screens the raw materials according to actual needs to obtain cement raw materials, mixes the prepared cement raw materials according to specifications or batching plans, and then grinds the mixed materials into powder with a mill, and transports them to the decomposition furnace equipment with an elevator for pre-decomposition, and then calcines them through a rotary kiln. The burned material is cement clinker, and finally it is air-cooled in a cooler and transported to the clinker warehouse with a conveyor belt for storage. The fuel for cement clinker is coal, which is stored in a separate storage bin outside the kiln. It is quantitatively fed to the mill to be processed into coal powder, and then the coal powder is sprayed into the kiln with a pneumatic pipe as cement calcination fuel.

[0003] As one of the technical equipment in the cement burning system, the cement rotary kiln has the characteristics of nonlinearity, multivariate, and complex calcination. Due to the high temperature in the kiln and the field distribution of the temperature, the complex movement of raw materials and fuel combustion, and the special physical structure of the rotary kiln, the actual temperature detection and control quantity are numerous. These problems bring inconvenience to the prediction and control of the temperature in the kiln. The existing carbon emission reduction technology route and carbon emission calculation method have been clarified, but the impact of various uncertain factors on the temperature during the cement calcination process is not considered, resulting in a lack of accurate fuel consumption, which makes it difficult to carry out refined carbon emission calculations, affecting the emission reduction benefit evaluation of cement. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a method for calculating carbon emissions from cement production taking uncertainty factors into account.

[0005] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is: A method for calculating carbon emissions from cement production taking into account uncertainty factors comprises the following steps: S1. Calculate the carbon emissions generated by raw materials in the calcination process of cement production based on the required cement clinker output; S2. According to the process parameters of cement rotary kiln, establish the thermal balance model of cement kiln, and fit and predict the uncertainty factors in the complex calcination process according to the process parameters and production data of cement rotary kiln, and obtain the parameter value of radiation heat dissipation on the surface of cement kiln; S3, calculating the carbon emissions generated by fuel combustion during the calcination process of cement production according to the cement kiln heat balance model in step S2 and the parameter values ​​of the cement kiln surface radiation heat dissipation; S4. Calculate the carbon emissions from electricity use during the grinding process of cement production. Calculate the carbon emissions from cement production based on the carbon emissions generated by raw materials during the calcination process of cement production in step S1, the carbon emissions generated by fuel combustion during the calcination process of cement production in step S3, and the carbon emissions from electricity use during the grinding process of cement production.

[0006] Furthermore, step S1 includes the following steps: S11. Calculate the amount of raw materials required based on the required cement clinker output; S12, according to the amount of raw materials required in step S11, determining the content of carbonate calcium oxide and non-carbonate calcium oxide in the raw materials; S13, determining the content of organic impurities in the raw materials according to the amount of raw materials required in step S11; S14. Calculate the carbon emissions generated by raw materials during the calcination process of cement production based on the contents of carbonate calcium oxide and non-carbonate calcium oxide in the raw materials in step S12 and the content of organic impurities in the raw materials in step S13.

[0007] Further, step S14 includes the following steps: S141. According to the contents of carbonate calcium oxide and non-carbonate calcium oxide in the raw materials in step S12, the carbon dioxide generated by the decomposition of carbonate in the raw material is calculated, which is expressed as: WHAT f =(M CaO -M n-CaO )× 44 / 56 +M MgO × 44 / 40 in: WHAT f Carbon dioxide is produced by the decomposition of carbonates in the raw material. M CaO is the mass of calcium oxide in the carbonate, M n-CaO is the mass of calcium oxide in non-carbonate, M MgO is the mass of magnesium oxide in carbonate; S142, according to the content of organic impurities in the raw materials in step S13, calculate the carbon dioxide generated by the organic impurities in the raw material during the calcination process, expressed as: WHAT sr =M sr ×EF sr in: WHAT sr Carbon dioxide is produced during the calcination process of organic impurities in the raw material. M sr is the organic impurity content in the raw materials, EF sr is the emission coefficient of organic impurities; S143. Calculate the carbon emissions generated by the raw materials during the calcination process of cement production based on the carbon dioxide generated by the decomposition of carbonates in the raw materials in step S141 and the carbon dioxide generated by organic impurities in the raw materials during the calcination process in step S142, expressed as: WHAT S =CE f + WHAT sr in: WHAT S Carbon emissions from the calcination of raw materials in cement production.

[0008] Furthermore, in step S2, a cement kiln heat balance model is established according to the process parameters of the cement rotary kiln, which is expressed as: m r ·Q net,ar +Q sr +Q s +Q k = Q sh +Q lsh +Q f +Q pk +Q B in: m r is the fuel consumption per kg of clinker, Q net,ar To ensure the low calorific value of coal powder entering the kiln, Q sr The heat generated by the combustion of organic matter in the raw meal to produce one kilogram of clinker, Q s The sensible heat brought into the raw material per kilogram of clinker, Q k The sensible heat of air entering the kiln for each kilogram of clinker produced, Q sh is the reaction absorption heat generated per kilogram of clinker, Q lshFor the sensible heat of the clinker leaving the cooler, Q f The sensible heat of the preheater exhaust gas. Q pk The sensible heat of the cooler exhaust gas. Q B Dissipate heat through radiation from the cement kiln surface.

[0009] Further, in step S2, fitting and predicting the uncertainty factors in the complex calcination process are performed according to the process parameters and production data of the cement rotary kiln to obtain the parameter value of the radiant heat dissipation on the surface of the cement kiln, including the following steps: A1. According to the process parameters of cement rotary kiln, a normal distribution model of radiant heat dissipation on the surface of cement kiln is constructed, which is expressed as: Q B ~ N ( μ 0 , σ 0 2 ) in: Q B To dissipate heat from the surface of the cement kiln. N is the symbol of normal distribution, μ 0 is the expected value of the heat dissipation from the cement kiln surface, and its value range is determined by the process parameters of the cement rotary kiln. σ 0 It is the fluctuation degree of radiation heat dissipation on the surface of cement kiln; A2. According to the normal distribution model of the radiant heat dissipation of the cement kiln surface, the parameter values ​​of the radiant heat dissipation of the cement kiln surface are obtained using production data.

[0010] Further, step A2 includes the following steps: A21. Use production data to obtain the estimated value of the radiant heat dissipation on the cement kiln surface and the estimated value of the fluctuation degree of the radiant heat dissipation on the cement kiln surface, expressed as:

[0011]

[0012] in: is the estimated value of the heat dissipated by radiation from the cement kiln surface, is the average radiation heat dissipation of the cement kiln surface of all samples in the production data, is the estimated value of the fluctuation degree of radiant heat dissipation on the cement kiln surface, is the sample number in the production data, is the total number of samples in the production data, For production data Surface radiation heat dissipation of cement kilns of samples; A22. Based on the estimated value of the radiant heat dissipation on the cement kiln surface and the estimated value of the fluctuation degree of the radiant heat dissipation on the cement kiln surface in step A21, a hypothesis test is performed on the expected value of the radiant heat dissipation on the cement kiln surface and the fluctuation degree of the radiant heat dissipation on the cement kiln surface to determine the expected value of the radiant heat dissipation on the cement kiln surface and the fluctuation degree of the radiant heat dissipation on the cement kiln surface, which is expressed as: Assumptions ,have , the significance level is The rejection region of is expressed as:

[0013] Assumptions ,have , the rejection region with a significance level of α is expressed as:

[0014] in: is the first test statistic, is the sample standard deviation, The degrees of freedom are of distributed, for The probability in the distribution is The upper quantile of is the second test statistic, The degrees of freedom are of distributed, for The probability in the distribution is The upper quantile of for The probability in the distribution is The upper quantile of ; A23. Obtain parameter values ​​of the radiant heat dissipation of the cement kiln surface according to the normal distribution model of the radiant heat dissipation of the cement kiln surface, the expected value of the radiant heat dissipation of the cement kiln surface in step A22, and the degree of fluctuation of the radiant heat dissipation of the cement kiln surface.

[0015] Further, in step S3, the carbon emissions generated by fuel combustion during the calcination process of cement production are calculated according to the cement kiln heat balance model in S2 and the determined cement kiln surface radiation heat dissipation, including the following steps: B1. Calculate the amount of fuel required for cement production during the calcination process based on the cement kiln heat balance model; B2. According to the required fuel consumption in the cement production process in step B1, the carbon emissions generated by the fuel combustion in the cement production process are calculated, which can be expressed as: WHAT r =m r ·γ·44 / 12 in: WHAT r Carbon emissions from fuel combustion during the calcination process of cement production. γ is the carbon content of the fuel, 44 / 12 is CO 2 The ratio of the relative molecular mass of C.

[0016] Further, in step S4, the carbon emissions of cement production are calculated based on the carbon emissions generated by raw materials during the calcination process of cement production in step S1, the carbon emissions generated by fuel combustion during the calcination process of cement production in step S3, and the carbon emissions of electricity used during the grinding process of cement production, which is expressed as: WHAT=WHAT e + WHAT r + WHAT S in: WHAT Carbon emissions from cement production, WHAT e Carbon emissions from electricity use in the grinding process of cement production, WHAT r Carbon emissions from fuel combustion during the calcination process of cement production. WHAT S Carbon emissions from the calcination of raw materials in cement production.

[0017] The present invention has the following beneficial effects: (1) When calculating the carbon emissions generated by raw materials during the calcination process of cement production, the present invention calculates the amount of raw materials required according to the required cement clinker output, determines the content of carbonate calcium oxide and non-carbonate calcium oxide in the raw materials according to the required amount of raw materials, and determines the content of organic impurities in the raw materials according to the required amount of raw materials, and then calculates the carbon emissions generated by raw materials during the calcination process of cement production. In addition to considering the conventional carbonate decomposition, the influence of non-carbonate calcium oxide and organic impurities on the carbon emission calculation is also considered, so that the calculation result is more accurate; (2) When calculating the carbon emissions generated by fuel combustion during the calcination process of cement production, the present invention establishes a cement kiln heat balance model based on the process parameters of the cement rotary kiln, and fits and predicts the uncertainty factors in the complex calcination process based on the process parameters and production data of the cement rotary kiln, obtains the parameter values ​​of the radiant heat dissipation on the surface of the cement kiln, and calculates the carbon emissions generated by fuel combustion during the calcination process of cement production based on the parameter values ​​of the radiant heat dissipation on the surface of the cement kiln and the cement kiln heat balance model. This process takes into account the complex thermal balance inside the cement kiln and the radiant heat dissipation on the surface of the cement kiln, solves the problem that the uncertainty factors affecting the temperature of the burning zone are difficult to evaluate, and thus makes the calculation results more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A flow chart of a method for calculating carbon emissions from cement production taking uncertainty factors into account; Figure 2 Schematic diagram of the heat balance model of cement kiln. DETAILED DESCRIPTION

[0019] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0020] like Figure 1 As shown, a method for calculating carbon emissions from cement production taking into account uncertainty factors includes steps S1-S4, which are as follows: S1. Calculate the carbon emissions from raw materials in the calcination process of cement production based on the required cement clinker output.

[0021] In an optional embodiment of the present invention, the present invention calculates the amount of raw materials required according to the required cement clinker output. The raw materials for cement production mainly include limestone, silica fume, iron phase, gypsum, magnesium carbonate, and also contain trace amounts of non-carbonate calcium oxide and organic impurities. Calcium carbonate and magnesium carbonate are the main raw materials for cement. The present invention calculates the amount of calcium carbonate and magnesium carbonate according to the required cement clinker output to calculate the amount of raw materials required, and then calculates the carbon emissions generated by raw materials during the calcination process of cement production.

[0022] Step S1 includes the following steps: S11. Calculate the amount of raw materials required based on the required cement clinker output.

[0023] The present invention calculates the dosage of calcium carbonate and magnesium carbonate according to the required cement clinker output, so as to calculate the dosage of the required raw materials.

[0024] The present invention calculates the consumption of calcium carbonate, and is expressed as: ,

[0025] in: is the amount of calcium carbonate, To generate C 3 Calcium carbonate consumed by S, To generate C 2 Calcium carbonate consumed by S, To generate C 3 A consumes calcium carbonate, To generate C 4 Calcium carbonate consumed by AF, To generate C 4 A 3 The amount of calcium carbonate consumed, Calcium carbonate consumed to generate f-CaO. To generate Calcium carbonate consumed by clinker components, Represents C 3 S.C. 2 S.C. 3 A.C 4 AF, C 4 A 3 S and f-CaO, is the proportion of the i-th mineral component in the clinker, To generate 1 mol of mineral, the amount of CaCO involved in the chemical reaction is 3 The ratio of the mass of to the molar mass of the minerals in the clinker.

[0026] The present invention calculates the consumption of magnesium carbonate, and is expressed as:

[0027] in: is the dosage of magnesium carbonate, It is the proportion of MgO in clinker.

[0028] S12. Determine the content of carbonate calcium oxide and non-carbonate calcium oxide in the raw materials according to the amount of raw materials required in step S11.

[0029] The present invention adopts chemical methods such as glycerol method and ethylene glycol method according to the required amount of raw materials to determine the content of carbonate calcium oxide and non-carbonate calcium oxide in the raw materials.

[0030] S13. Determine the content of organic impurities in the raw materials according to the amount of raw materials required in step S11.

[0031] S14. Calculate the carbon emissions generated by raw materials during the calcination process of cement production based on the contents of carbonate calcium oxide and non-carbonate calcium oxide in the raw materials in step S12 and the content of organic impurities in the raw materials in step S13.

[0032] Step S14 includes the following steps: S141. According to the contents of carbonate calcium oxide and non-carbonate calcium oxide in the raw materials in step S12, the carbon dioxide generated by the decomposition of carbonate in the raw material is calculated, which is expressed as: WHAT f =(M CaO -M n-CaO )× 44 / 56 +M MgO × 44 / 40 in: WHAT f Carbon dioxide is produced by the decomposition of carbonates in the raw material. M CaO is the mass of calcium oxide in the carbonate, M n-CaO is the mass of calcium oxide in non-carbonate, M MgO is the mass of magnesium oxide in the carbonate.

[0033] S142, according to the content of organic impurities in the raw materials in step S13, calculate the carbon dioxide generated by the organic impurities in the raw material during the calcination process, expressed as: WHAT sr =M sr ×EF sr in: WHAT sr Carbon dioxide is produced during the calcination process of organic impurities in the raw material. M sr is the organic impurity content in the raw materials, EF sr is the emission coefficient of organic impurities.

[0034] S143. Calculate the carbon emissions generated by the raw materials during the calcination process of cement production based on the carbon dioxide generated by the decomposition of carbonates in the raw materials in step S141 and the carbon dioxide generated by organic impurities in the raw materials during the calcination process in step S142, expressed as: WHAT S =CE f + WHAT sr in: WHAT S Carbon emissions from the calcination of raw materials in cement production.

[0035] S2. According to the process parameters of cement rotary kiln, a thermal balance model of cement kiln is established. The uncertainty factors in the complex calcination process are fitted and predicted according to the process parameters and production data of cement rotary kiln to obtain the parameter values ​​of radiation heat dissipation on the surface of cement kiln.

[0036] In an optional embodiment of the present invention, the uncertainty factors include the complex heat balance inside the cement kiln and the radiation heat dissipation on the surface of the cement kiln.

[0037] like Figure 2 As shown, the present invention takes into account the energy balance of the firing system and establishes a cement kiln heat balance model taking into account uncertainty factors, which is expressed as: m r ·Q net,ar +Q sr +Q s +Q k = Q sh +Q lsh +Q f +Q pk +Q B in: m r is the fuel consumption per kg of clinker, Q net,ar To ensure that the coal powder entering the kiln has a low calorific value, Q sr The heat generated by the combustion of organic matter in the raw meal to produce one kilogram of clinker, Q s The sensible heat brought into the raw material per kilogram of clinker, Q k The sensible heat of air entering the kiln for each kilogram of clinker produced, Q sh is the reaction absorption heat generated per kilogram of clinker, Q lsh For the sensible heat of the clinker leaving the cooler, Q fThe sensible heat of the preheater exhaust gas. Q pk The sensible heat of the cooler exhaust gas. Q B Dissipate heat through radiation from the cement kiln surface.

[0038] The present invention calculates the heat Q generated by fuel combustion when producing each kilogram of clinker rR , expressed as: Q rR =m r ·Q net,ar in: m r The mass of fuel required to produce one kilogram of clinker, Q net,ar The fuel receives a low calorific value.

[0039] The present invention calculates the heat generated by the combustion of organic matter in the raw material when producing each kilogram of clinker Q sr , expressed as: Q sr =m sr ·Q net,sr in: m sr The amount of organic impurities in each kilogram of clinker raw material produced, Q net,sr The organic impurities receive a low calorific value.

[0040] The present invention calculates the sensible heat brought into the raw material per kilogram of clinker Q s , expressed as: Q s = m s · c s · t s，

[0041] in: m s is the mass of raw material per kilogram of clinker, c s is the specific heat capacity of the raw material, is the moisture content of raw material, t s is the temperature of the raw material.

[0042] The present invention calculates the sensible heat of air entering the kiln per kilogram of clinker produced Q k , expressed as: Q k = m k · c k · t k in: m k is the mass of air entering the kiln per kilogram of clinker, c k is the specific heat capacity of the air entering the kiln, t k is the ambient temperature of the air entering the kiln.

[0043] The present invention calculates the reaction absorption heat generated by each kilogram of clinker Q sh , expressed as: Q sh =Σ( m k · )+Σ( w x · ) in: m k is the consumption of raw materials, for k Enthalpy change of conversion to oxide, w x Clinker phase x Quality, For oxides and CaSO 4 generate x enthalpy change.

[0044] The present invention calculates the sensible heat of the cooler clinker Q lsh , expressed as: Q lsh = m lsh · c lsh · t lsh in: m lsh is the mass of clinker out of the cooler per kilogram of clinker, c lsh is the specific heat capacity of clinker,t lsh It is the ambient temperature of clinker leaving the cooler.

[0045] The present invention calculates the sensible heat of the preheater outlet gas Q f , expressed as: Q f =V f / M sh ·c f ·t f，

[0046] in: V f is the exhaust gas volume at the preheater outlet per hour, M sh is the clinker production per hour, t f is the temperature of the exhaust gas at the preheater outlet, c f is the volume specific heat capacity of the exhaust gas at the preheater outlet, For CO 2 The mass weight in the gas mixture, For CO 2 The volume specific heat capacity, is the mass weight of CO in the mixed gas, is the volume specific heat capacity of CO, O 2 The mass weight in the gas mixture, O 2 The volume specific heat capacity, N 2 The mass weight in the gas mixture, N 2 The volume specific heat capacity, H 2 The mass weight of O in the mixed gas, H 2 The volume specific heat capacity of O.

[0047] The present invention calculates the sensible heat of the cooling machine outlet gas Q pk , expressed as: Q pk =V pk / M pk ·c pk·t pk in: V pk is the volume of air discharged from the cooler per hour, M pk is the clinker production per hour, c pk is the specific heat capacity of the cooler outlet gas volume, t pk The temperature of the cooler outlet air.

[0048] The present invention performs fitting prediction on the uncertainty factors in the complex calcination process according to the process parameters and production data of the cement rotary kiln, and obtains the parameter value of the radiation heat dissipation on the surface of the cement kiln, including the following steps: A1. According to the process parameters of cement rotary kiln, a normal distribution model of radiant heat dissipation on the surface of cement kiln is constructed, which is expressed as: Q B ~ N ( μ 0 , σ 0 2 ) in: Q B To dissipate heat from the surface of the cement kiln. N is the symbol of normal distribution, μ 0 is the expected value of the heat dissipation from the cement kiln surface, and its value range is determined by the process parameters of the cement rotary kiln. σ 0 It is the fluctuation degree of radiation heat dissipation on the surface of cement kiln.

[0049] Conventional cement rotary kilns can produce 5×10 6 kg clinker, radius 2.4m, length 74m. According to the process parameters of cement rotary kiln, the present invention determines that the radiation heat dissipation range of rotary kiln is 150kj / kg~300kj / kg, so there are 150 <μ 0 <300 .

[0050] A2. According to the normal distribution model of the radiant heat dissipation of the cement kiln surface, the parameter values ​​of the radiant heat dissipation of the cement kiln surface are obtained using production data.

[0051] Step A2 includes the following steps: A21. Use production data to obtain the estimated value of the radiant heat dissipation on the cement kiln surface and the estimated value of the fluctuation degree of the radiant heat dissipation on the cement kiln surface, expressed as:

[0052]

[0053] in: is the estimated value of the heat dissipated by radiation from the cement kiln surface, is the average radiation heat dissipation of the cement kiln surface of all samples in the production data, is the estimated value of the fluctuation degree of radiant heat dissipation on the cement kiln surface, is the sample number in the production data, is the total number of samples in the production data, For production data Surface radiation heat dissipation of cement kilns of samples.

[0054] A22. Based on the estimated value of the radiant heat dissipation on the cement kiln surface and the estimated value of the fluctuation degree of the radiant heat dissipation on the cement kiln surface in step A21, a hypothesis test is performed on the expected value of the radiant heat dissipation on the cement kiln surface and the fluctuation degree of the radiant heat dissipation on the cement kiln surface to determine the expected value of the radiant heat dissipation on the cement kiln surface and the fluctuation degree of the radiant heat dissipation on the cement kiln surface, which is expressed as: Assumptions ,have , the significance level is The rejection region of is expressed as:

[0055] Assumptions ,have , the rejection region with a significance level of α is expressed as:

[0056] in: is the first test statistic, is the sample standard deviation, The degrees of freedom are of distributed, for The probability in the distribution is The upper quantile of is the second test statistic, The degrees of freedom are of distributed, for The probability in the distribution is The upper quantile of for The probability in the distribution is The upper quantile of ; A23. Obtain parameter values ​​of the radiant heat dissipation of the cement kiln surface according to the normal distribution model of the radiant heat dissipation of the cement kiln surface, the expected value of the radiant heat dissipation of the cement kiln surface in step A22, and the degree of fluctuation of the radiant heat dissipation of the cement kiln surface.

[0057] S3. Calculate the carbon emissions generated by fuel combustion during the calcination process of cement production according to the cement kiln heat balance model in step S2 and the parameter values ​​of the cement kiln surface radiation heat dissipation.

[0058] In an optional embodiment of the present invention, the present invention calculates the carbon emissions generated by fuel combustion during the calcination process of cement production according to the cement kiln heat balance model, including the following steps: B1. Calculate the amount of fuel required for cement production during the calcination process based on the cement kiln heat balance model.

[0059] B2. According to the required fuel consumption in the cement production process in step B1, the carbon emissions generated by the fuel combustion in the cement production process are calculated, which can be expressed as: WHAT r =m r ·γ·44 / 12 in: WHAT r Carbon emissions from fuel combustion during the calcination process of cement production. γ is the carbon content of the fuel, 44 / 12 is CO 2 The ratio of the relative molecular mass of C.

[0060] S4. Calculate the carbon emissions from electricity use during the grinding process of cement production. Calculate the carbon emissions from cement production based on the carbon emissions generated by raw materials during the calcination process of cement production in step S1, the carbon emissions generated by fuel combustion during the calcination process of cement production in step S3, and the carbon emissions from electricity use during the grinding process of cement production.

[0061] In an optional embodiment of the present invention, the present invention calculates the carbon emissions of electricity used in the grinding process of cement production, expressed as: WHAT e =E×EF e in: WHAT e Carbon emissions from electricity use in the grinding process of cement production, E For electricity consumption, EF e CO for electricity production 2 Emission factors.

[0062] The present invention calculates the carbon emissions of cement production based on the carbon emissions generated by raw materials during the calcination process of cement production in step S1, the carbon emissions generated by fuel combustion during the calcination process of cement production in step S3, and the carbon emissions of electricity used during the grinding process of cement production, which can be expressed as: WHAT=WHAT e + WHAT r + WHAT S in: WHAT Carbon emissions from cement production, WHAT e Carbon emissions from electricity use in the grinding process of cement production, WHAT r Carbon emissions from fuel combustion during the calcination process of cement production. WHAT S Carbon emissions from the calcination of raw materials in cement production.

[0063] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0064] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0065] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0066] The present invention uses specific embodiments to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

[0067] Those skilled in the art will appreciate that the embodiments described herein are intended to help readers understand the principles of the present invention, and should be understood that the protection scope of the present invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific variations and combinations that do not deviate from the essence of the present invention based on the technical revelations disclosed by the present invention, and these variations and combinations are still within the protection scope of the present invention.

Claims

1. A method for calculating carbon emissions from cement production taking into account uncertainty factors, characterized in that: The following steps are involved: S1. Calculate the carbon emissions generated by raw materials in the calcination process of cement production based on the required cement clinker output; S2. According to the process parameters of cement rotary kiln, establish the thermal balance model of cement kiln, and fit and predict the uncertainty factors in the complex calcination process according to the process parameters and production data of cement rotary kiln, and obtain the parameter value of radiation heat dissipation on the surface of cement kiln; S3, calculating the carbon emissions generated by fuel combustion during the calcination process of cement production according to the cement kiln heat balance model in step S2 and the parameter values ​​of the cement kiln surface radiation heat dissipation; S4. Calculate the carbon emissions from electricity use during the grinding process of cement production. Calculate the carbon emissions from cement production based on the carbon emissions generated by raw materials during the calcination process of cement production in step S1, the carbon emissions generated by fuel combustion during the calcination process of cement production in step S3, and the carbon emissions from electricity use during the grinding process of cement production.

2. A method for calculating carbon emissions from cement production taking into account uncertainty factors according to claim 1, characterized in that: Step S1 includes the following steps: S11. Calculate the amount of raw materials required based on the required cement clinker output; S12, according to the amount of raw materials required in step S11, determining the content of carbonate calcium oxide and non-carbonate calcium oxide in the raw materials; S13, determining the content of organic impurities in the raw materials according to the amount of raw materials required in step S11; S14. Calculate the carbon emissions generated by raw materials during the calcination process of cement production based on the contents of carbonate calcium oxide and non-carbonate calcium oxide in the raw materials in step S12 and the content of organic impurities in the raw materials in step S13.

3. A method for calculating carbon emissions from cement production taking into account uncertainty factors according to claim 2, characterized in that: Step S14 includes the following steps: S141. According to the contents of carbonate calcium oxide and non-carbonate calcium oxide in the raw materials in step S12, the carbon dioxide generated by the decomposition of carbonate in the raw material is calculated, which is expressed as: CE f =(M CaO -M n-CaO )× 44 / 56 +M MgO × 44 / 40 in: CE f Carbon dioxide is produced by the decomposition of carbonates in the raw material. M CaO is the mass of calcium oxide in the carbonate, M n-CaO is the mass of calcium oxide in non-carbonate, M MgO is the mass of magnesium oxide in carbonate; S142, according to the content of organic impurities in the raw materials in step S13, calculate the carbon dioxide generated by the organic impurities in the raw material during the calcination process, expressed as: CE sr =M sr ×EF sr in: CE sr Carbon dioxide is produced during the calcination process of organic impurities in the raw material. M sr is the organic impurity content in the raw materials, EF sr is the emission coefficient of organic impurities; S143. Calculate the carbon emissions generated by the raw materials during the calcination process of cement production based on the carbon dioxide generated by the decomposition of carbonates in the raw materials in step S141 and the carbon dioxide generated by organic impurities in the raw materials during the calcination process in step S142, expressed as: CE S =CE f ＋ CE sr in: CE S Carbon emissions from the calcination of raw materials in cement production.

4. The method for calculating carbon emissions from cement production taking into account uncertainty factors according to claim 1, characterized in that: In step S2, a cement kiln heat balance model is established according to the process parameters of the cement rotary kiln, which is expressed as: m r ·Q net,ar +Q sr +Q s +Q k = Q sh +Q lsh +Q f +Q pk +Q B in: m r is the fuel consumption per kg of clinker, Q net,ar To ensure the low calorific value of coal powder entering the kiln, Q sr The heat generated by the combustion of organic matter in the raw meal to produce one kilogram of clinker, Q s The sensible heat brought into the raw material per kilogram of clinker, Q k The sensible heat of air entering the kiln for each kilogram of clinker produced, Q sh is the reaction absorption heat generated per kilogram of clinker, Q lsh For the sensible heat of the clinker leaving the cooler, Q f The sensible heat of the preheater exhaust gas. Q pk The sensible heat of the cooler exhaust gas. Q B Dissipate heat through radiation from the cement kiln surface.

5. The method for calculating carbon emissions from cement production taking into account uncertainty factors according to claim 1, characterized in that: In step S2, fitting and predicting the uncertainty factors in the complex calcination process is performed according to the process parameters and production data of the cement rotary kiln to obtain the parameter value of the radiant heat dissipation on the surface of the cement kiln, including the following steps: A1. According to the process parameters of cement rotary kiln, a normal distribution model of radiant heat dissipation on the surface of cement kiln is constructed, which is expressed as: Q B ~ N （ μ 0， σ 0 2 ） in: Q B To dissipate heat from the surface of the cement kiln. N is the symbol of normal distribution, μ 0 is the expected value of the heat dissipation by radiation from the cement kiln surface, and the value range is determined by the process parameters of the cement rotary kiln. σ 0 is the fluctuation degree of radiation heat dissipation on the cement kiln surface; A2. According to the normal distribution model of the radiant heat dissipation of the cement kiln surface, the parameter values ​​of the radiant heat dissipation of the cement kiln surface are obtained using production data.

6. A method for calculating carbon emissions from cement production taking into account uncertainty factors according to claim 5, characterized in that: Step A2 includes the following steps: A21. Use production data to obtain the estimated value of the radiant heat dissipation on the cement kiln surface and the estimated value of the fluctuation degree of the radiant heat dissipation on the cement kiln surface, expressed as: in: is the estimated value of the heat dissipated by radiation from the cement kiln surface, is the average radiation heat dissipation of the cement kiln surface of all samples in the production data, is the estimated value of the fluctuation degree of radiant heat dissipation on the cement kiln surface, is the sample number in the production data, is the total number of samples in the production data, For production data Surface radiation heat dissipation of cement kilns of samples; A22. Based on the estimated value of the radiant heat dissipation on the cement kiln surface and the estimated value of the fluctuation degree of the radiant heat dissipation on the cement kiln surface in step A21, a hypothesis test is performed on the expected value of the radiant heat dissipation on the cement kiln surface and the fluctuation degree of the radiant heat dissipation on the cement kiln surface to determine the expected value of the radiant heat dissipation on the cement kiln surface and the fluctuation degree of the radiant heat dissipation on the cement kiln surface, which is expressed as: Assumptions ,have , the significance level is The rejection region of is expressed as: Assumptions ,have , the rejection region with a significance level of α is expressed as: in: is the first test statistic, is the sample standard deviation, The degrees of freedom are of distributed, for The probability in the distribution is The upper quantile of is the second test statistic, The degrees of freedom are of distributed, for The probability in the distribution is The upper quantile of for The probability in the distribution is The upper quantile of ; A23. Obtain parameter values ​​of the radiant heat dissipation of the cement kiln surface according to the normal distribution model of the radiant heat dissipation of the cement kiln surface, the expected value of the radiant heat dissipation of the cement kiln surface in step A22, and the degree of fluctuation of the radiant heat dissipation of the cement kiln surface.

7. A method for calculating carbon emissions from cement production taking into account uncertainty factors according to claim 6, characterized in that: In step S3, the carbon emissions generated by fuel combustion during the calcination process of cement production are calculated according to the cement kiln heat balance model in S2 and the determined cement kiln surface radiation heat dissipation, including the following steps: B1. Calculate the amount of fuel required for cement production during the calcination process based on the cement kiln heat balance model; B2. According to the required fuel consumption in the cement production process in step B1, the carbon emissions generated by the fuel combustion in the cement production process are calculated, which can be expressed as: CE r =m r γ·44 / 12 in: CE r Carbon emissions from fuel combustion during the calcination process of cement production. γ is the carbon content of the fuel, and 44 / 12 is the ratio of the relative molecular mass of CO2 to C.

8. The method for calculating carbon emissions from cement production taking into account uncertainty factors according to claim 1, characterized in that: In step S4, the carbon emissions of cement production are calculated based on the carbon emissions generated by raw materials during the calcination process of cement production in step S1, the carbon emissions generated by fuel combustion during the calcination process of cement production in step S3, and the carbon emissions of electricity used during the grinding process of cement production, which is expressed as: CE=CE e ＋ CE r ＋ CE S in: CE Carbon emissions from cement production, CE e Carbon emissions from electricity use in the grinding process of cement production, CE r Carbon emissions from fuel combustion during the calcination process of cement production. CE S Carbon emissions from the calcination of raw materials in cement production.

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