Method for quantifying full-life-cycle environmental influence of slot type photo-thermal power station

Abstract

The invention belongs to the technical field of life cycle evaluation methods, and relates to a method for quantifying full life cycle environmental influence of a slot type photo-thermal power station. The method comprises the following steps of: firstly, confirming a target and a range, collecting a material list of equipment of each part of a power station and input data of various material energy by taking the generating capacity of 1MW. H as a functional unit and taking a research range as a whole life cycle process from a cradle to a tomb, performing corresponding list analysis, and then establishing a whole life cycle model; after classification, characterization and normalization, 11 kinds of midpoint environmental impact indexes are used for impact analysis, and finally, a result is explained, so that a reference basis is provided for optimizing an equipment manufacturing process and technical innovation to reduce environmental impact.

Description

Technical Field

[0001] The present invention belongs to the technical field of life cycle assessment methods and relates to a method for quantifying the environmental impact of a trough type solar thermal power station over its entire life cycle. Background Art

[0002] At present, vigorously developing renewable energy has become the dominant direction of the global energy low-carbon transformation. As one of the most ideal renewable energy sources, trough solar thermal power generation has the dual functions of peak-shaving power supply and energy storage. It is a grid-friendly power supply and an effective means for new energy to safely and reliably replace traditional energy.

[0003] Life Cycle Assessment (LCA) can evaluate the potential environmental impact of products or services from cradle to grave. Solutions based on LCA results can better avoid the transfer of environmental impacts between different processes or different environmental media. CSP technology developed earlier, data sources are relatively complete, and related research is also relatively rich. However, there is a relative lack of quantitative calculation methods for the environmental impact of trough CSP power stations throughout their life cycle. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a method for quantifying the environmental impact of a trough type solar thermal power station over its entire life cycle.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A method for quantifying the environmental impact of a parabolic trough solar thermal power plant over its entire life cycle comprises the following steps:

[0007] (1) Objective and scope determination: The research boundary covers all life cycle stages of trough CSP plants, from equipment manufacturing, transportation, facility operation to recycling and treatment. The resource and energy input of each unit process within the system boundary, as well as the emissions of gases and wastes generated during the operation process, are considered. The functional unit is defined as a power generation capacity of 1 MW·h.

[0008] (2) Inventory analysis: Collect input data for each stage of the entire life cycle of a trough CSP plant; the data include resources, energy consumption, pollutant emissions, and pollutant treatment.

[0009] (3) Impact assessment method: Based on the actual data of the field survey and the background data of the built-in database of the GaBi software, a model is built for each stage of the life cycle of a 1 MW·h parabolic trough CSP power station. The environmental impact is comprehensively quantified using the CML2001-Aug.2016 method. Eleven midpoint environmental impact indicators are selected to quantify the environmental impact of the parabolic trough CSP power station over its life cycle. The calculation formula is shown in formula (1):

[0010]

[0011] In the formula,

[0012] M i represents the midpoint environmental impact index of the i-th category;

[0013] a i represents the characterization factor of the midpoint environmental impact indicator of the i-th category;

[0014] A j is the midpoint environmental impact index value after the jth characterization.

[0015] The 11 midpoint environmental impact indicators selected are abiotic resource depletion potential, abiotic fossil resource consumption potential, acidification potential, water eutrophication potential, freshwater ecotoxicity, global warming potential, global warming potential (biodegradable carbon), human toxicity potential, marine water ecotoxicity, ozone depletion potential, and terrestrial ecotoxicity.

[0016] (4) Interpretation of results: Through GaBi software modeling, combined with the midpoint environmental impact indicators of CML2001-Aug.2016, a comprehensive assessment of environmental impacts was conducted and key pollution stages throughout the life cycle were analyzed. The contribution rate of key factors to environmental impacts was analyzed, and effective improvement directions and corresponding measures to reduce pollutant emissions were proposed based on the contribution rate to reduce the environmental impact of trough CSP plants throughout their life cycle.

[0017] Beneficial effects of the present invention:

[0018] The environmental impact of the trough solar thermal power station over its entire life cycle is quantified from a full life cycle perspective, providing a specific basis for targeted optimization of equipment processes, research and development of greener and cleaner alternatives, and reducing environmental impacts. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a framework diagram for the environmental impact study of the entire life cycle of a parabolic trough solar thermal power station;

[0020] Figure 2 This is the system boundary diagram of the whole life cycle of a trough CSP power station;

[0021] Figure 3 This is a schematic diagram of the contribution rate of each stage of trough solar thermal power generation to various midpoint environmental impact indicators;

[0022] Figure 4(a) shows the sensitivity analysis of the abiotic depletion potential (ADP) indicator for trough CSP.

[0023] Figure 4(b) shows the potential value of non-biological consumption of fossil resources (ADP) for trough CSP fossil )Indicator sensitivity analysis.

[0024] Figure 4(c) shows the sensitivity analysis of the acidification potential (AP) indicator for trough CSP.

[0025] Figure 4(d) shows the sensitivity analysis of the eutrophication potential (EP) index of trough CSP water bodies.

[0026] Figure 4(e) shows the sensitivity analysis of the freshwater ecotoxicity (EAETP) index of trough CSP.

[0027] Figure 4(f) shows the sensitivity analysis of the global warming potential (GWP) indicator of trough CSP.

[0028] Figure 4(g) shows the sensitivity analysis of the global warming potential (without biogenic carbon) (GWPb) indicator of trough CSP.

[0029] Figure 4(h) shows the sensitivity analysis of the human toxicity potential (HTP) indicator of trough CSP.

[0030] Figure 4(i) shows the sensitivity analysis of the marine water ecotoxicity (MAETP) index of trough CSP.

[0031] Figure 4(j) is a sensitivity analysis of the ozone depletion potential (ODP) indicator of trough CSP.

[0032] Figure 4(k) shows the sensitivity analysis of the terrestrial ecotoxicity (TETP) index of trough CSP. DETAILED DESCRIPTION

[0033] The specific implementation of the present invention is further explained in combination with the technical scheme and the accompanying drawings.

[0034] The research object of this invention is a parabolic trough solar thermal power station; the research framework of the environmental impact of the parabolic trough solar thermal power station throughout its life cycle is as follows: Figure 1 As shown in the figure; the functional unit is set as power generation of 1MW·h; the research scope is determined to be all life cycle stages of equipment manufacturing, transportation, facility operation and recycling of trough CSP power plants, such as Figure 2 The real scene data selected in this example comes from relevant literature, a feasibility study report of a parabolic trough solar thermal power station, an environmental impact assessment report of related components, and a completed environmental acceptance report. The background data comes from the built-in database of the Gabi software.

[0035] The CML2001-Aug.2016 method was selected as the impact assessment method for this example. Eleven midpoint environmental indicators were selected, including abiotic resource depletion potential (ADP), abiotic fossil resource consumption potential (ADP fossil), acidification potential (AP), eutrophication potential (EP), freshwater ecotoxicity (FAETP), global warming potential (GWP), global warming potential (biochar-free) (GWPb), human toxicity potential (HTP), marine ecotoxicity (MAETP), ozone depletion potential (ODP), and terrestrial ecotoxicity (TETP). The quantitative results are shown in Table 1.

[0036] Table 1 Index results list

[0037]

[0038] The various indicators obtained by the present invention are visualized, such as Figure 3 shown.

[0039] For trough CSP power stations, the environmental impact of the equipment manufacturing stage in the whole life cycle is the most significant. Among the 11 indicators, ADP, FAETP, HTP, and ODP contribute more than 90%, which means that in the process of equipment manufacturing, a large amount of non-renewable resources are consumed and substances harmful to the freshwater environment and human body may be released, posing a potential risk to human health and the survival of aquatic organisms. At the same time, the pollutants released will cause ozone layer damage and have a negative impact on the environment and organisms.

[0040] The sensitivity analysis of raw materials is conducted in the manufacturing stage. While keeping other input parameters unchanged, the present invention changes each raw material as a single target variable by ±5% and ±10% to obtain the output changes of different types of environmental loads, thereby selecting the top four materials with the greatest impact and drawing a line graph. Figure 4(a) to Figure 4(k) shown.

[0041] For trough solar thermal power generation, the SMC material used to manufacture parabolic mirrors has the most significant impact on various environmental loads. In addition to the HTP index, ADP, ADP fossil Glass, SMC materials, carbon steel, and copper have a more significant impact on the ten indicators of AP, EP, FAETP, GWP, GWPb, MAETP, ODP, and TETP. Concrete has a slightly greater impact on the HTP indicator than glass. In addition, the amount of input materials and the proportion of the impact on the indicators show a linear positive correlation. Therefore, reducing the input of these materials can effectively reduce the environmental impact of solar thermal power generation. For trough solar thermal power stations, it is possible to consider optimizing the manufacturing process of parabolic mirrors and the structure of other equipment to reduce the input of the above materials.

[0042] By quantifying the environmental impact of the entire life cycle of a trough solar thermal power station and determining the key factors and important links that contribute most to various environmental impacts, we can more comprehensively analyze the main sources of pollution, make corresponding optimizations, and reduce environmental impacts in a targeted manner.

Claims

1. A method for quantifying the environmental impact of a parabolic trough solar thermal power plant over its entire life cycle, characterized in that: The steps include: (1) Objective and scope determination: The research boundary covers all life cycle stages from equipment manufacturing, transportation, facility operation to recycling and treatment of parabolic trough CSP plants. The resource and energy input of each unit process within the system boundary, as well as the emissions of gases and wastes generated during the operation process, are considered. The functional unit is defined as a power generation of 1 MW·h. (2) Inventory analysis: Collect input data for each stage of the entire life cycle of a trough CSP plant; the data includes resources, energy consumption, pollutant emissions, and pollutant treatment; (3) Impact assessment method: Based on the actual data of the field survey and the background data of the built-in database of the GaBi software, a model is built for each stage of the life cycle of a 1 MW·h parabolic trough CSP power station. The environmental impact is comprehensively quantified using the CML2001-Aug.2016 method. Eleven midpoint environmental impact indicators are selected to quantify the environmental impact of the parabolic trough CSP power station over its life cycle. The calculation formula is shown in formula (1): In the formula, M i represents the midpoint environmental impact index of the i-th category; a i represents the characterization factor of the midpoint environmental impact indicator of the i-th category; A j is the midpoint environmental impact index value after the jth characterization; The 11 midpoint environmental impact indicators selected are abiotic resource depletion potential, abiotic fossil resource consumption potential, acidification potential, water eutrophication potential, freshwater ecotoxicity, global warming potential, global warming potential, human toxicity potential, marine water ecotoxicity, ozone depletion potential, and terrestrial ecotoxicity. (4) Interpretation of results: Through GaBi software modeling, combined with the midpoint environmental impact indicators of CML2001-Aug.2016, a comprehensive assessment of environmental impacts was conducted and key pollution stages throughout the life cycle were analyzed. The contribution rate of key factors to environmental impacts was analyzed, and effective improvement directions and corresponding measures to reduce pollutant emissions were proposed based on the contribution rate to reduce the environmental impact of trough CSP plants throughout their life cycle.

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