Estimation and emissions from crop straw and animal dung in Tibet

Abstract Based on the statistics data, this paper estimated the quantity of biomass resource, and then the distribution of emissions from its combu3stion and gasification was analyzed in Tibet in 2015. The main conclusions are as follows: (1) biomass energy is rich in Tibet and its geographical distribution and quantity mainly depends on the relationship between ecological zones and the climate conditions. Crop straw is mainly distributed in Xigaze, Lasha, Qamdo and Shannan with the total quantity of 3.29 × 10 6  t/year; while animal dung is mainly distributed in Nagqu, Qamdo and Xigaze with the total quantity of 1.69 × 10 7  t/year. For the acquirable quantity of crop straw and animal dung is 7.27 × 10 6  t/year, mainly distributed in Nagqu, Qamdo and Xigaze. (2) The energy production potential of crop straw and animal dung in Tibet for combustion (thermal efficiency: 22.5%), HLG (system efficiency: 28.75% based on our investigation) and VLG (system efficiency: 38.75%) is 2.56 × 10 10  J/year, 3.28 × 10 10  J/year and 4.42 × 10 10  J/year, respectively. (3) Compared to the household combustion, the reduction of SO 2 is 72% with HLG and 97% with VLG, and the NOx reduction is 79% with HLG, 96% with VLG and 72% with gasification-combustion case.