Study On The Method Of Estimating Ecological Value Of Pyrolysis And Gasification Engineering Based On Straw Natural Maturity Baseline

As a special biomass resource,straw is"used to benefit,discarded to harm".The straw pyrolysis gasification project has realized the resource value of biomass straw,and the utilization of the products"gas,carbon,oil,liquid"has also been fully realized in terms of environmental benefit endowment.Accurately estimating the ecological value of straw pyrolysis and gasification projects,and providing a systematic and comprehensive quantitative evaluation index system and calculation method are important scientific basis for effectively promoting the green development of agriculture.At the same time,it has important practical significance for the rational,efficient,low-carbon and high-value utilization of straw resources,which is conducive to the maximization of the ecological value of the comprehensive utilization of straw.This study is based on the cost method theory in the ecological value theory,and systematically conducts a method for estimating the ecological value of the straw pyrolysis gasification project in accordance with the three steps of"net greenhouse gas emission reduction of project→monetary value of ecological benefit→ecological value".Firstly,use the"straw pyrolysis gasification project project net emission reduction=baseline emissions（straw straw stacking emissions+straw gas utilization alternative emission reduction（heating/power generation）+straw biochar heat generation utilization alternative emission reduction/straw biochar Return to the field to fix carbon and reduce emissions）-the incremental emission of energy consumption during straw pyrolysis and gasification-the total emissions of the project products",to stablish a systematic estimation method,calculation formula and required parameters for the net greenhouse gas emission reduction of straw pyrolysis gasification project.In the method construction process,the LCA method was selected to measure the net emission reduction of straw pyrolysis gasification engineering projects.Then,by using the shadow price of carbon dioxide to monetize the net emission reduction,the engineering ecological value is obtained.While constructing the method,Using the literature research method to analyze the selection of parameters required by each calculation link,and provided the parameter system required by the calculation process.Based on the estimation method of the ecological value of the straw pyrolysis gasification project constructed in this study,the typical engineering case-Jiangxi Shengniu Rice Husk Gasification Polygeneration Project is calculated,and the project’s output value in 2019 is about 200thousand yuan.At the same time,this study conducted an experimental determination and data analysis of the “baseline parameters—natural straw decomposition greenhouse gas emissions”required in the calculation process.The baseline is used as a background to analyze the effects of the project,that is,the background level when the project is not implemented.The baseline of greenhouse gas emission reduction of straw utilization projects can be understood as the background emissions of projects that are not implemented.It mainly includes two very different scenarios:one is based on the greenhouse gas emissions of straw uncontrolled incineration in the open air;the other is the greenhouse gas emissions from the natural decomposition of straw stacked in the open air as the baseline.At present,there are no literatures on the measurement and research of greenhouse gas emissions from straw open-air natural decomposition.In this study,the Yonghe Test Field of Anyang Academy of Agricultural Sciences in Henan Province was used as the test base.The test period was one year.It mainly simulates the two scenarios of wheat,corn and rice straw stacked on the ground in the field,roadside,empty field and other fields and inundated in natural water,respectively referred to as S processing and W processing.Simulated S treatment of natural decomposition of wheat straw piled on the ground,CO₂,CH₄,N₂O emission coefficients are 462.5589g·kg^-1,0.0324g·kg^-1,0.0179g·kg^-1;simulated corn straw stacked on the land For the S treatment of natural decay,the emission coefficients are 380.6586g·kg^-1,0.1036g·kg^-1,0.0656g·kg^-1;the S treatment for simulating the natural decomposition of rice straw piled on the land,the emission coefficients are 557.9623g·kg^-1,0.0250g·kg^-1,0.0339g·kg^-1.W treatment simulating the natural decomposition of wheat straw piled in a ditch,CO₂,CH₄,N₂O emission coefficients are 419.9028g·kg^-1,8.0258g·kg^-1,0.0354g·kg^-1;simulated corn stalk piled in a ditch In the W treatment of natural decomposition,the emission coefficients are 57.3254 g·kg^-1,6.6899 g·kg^-1,and0.0657 g·kg^-1;the W treatment of simulated natural decomposition of rice straw stacked in the ditch,the emission coefficients are 164.3952 g·kg^-1,6.7706 g·kg^-1,0.0096g·kg^-1.