A large number of mines are closed or abandoned every year in China.Geothermal utilization is one of the important ways to efficiently reuse underground resources in abandoned mines.How to calculate the volume and dis...A large number of mines are closed or abandoned every year in China.Geothermal utilization is one of the important ways to efficiently reuse underground resources in abandoned mines.How to calculate the volume and distribution of underground water storage space is the key to accurately evaluate the sustainable geothermal production in abandoned mines.In this paper,according to the multi-scale characteristics of the underground space in abandoned mine,the flow and heat transfer equations in the multi-scale space are sorted out systematically,and the calculation methods of different secondary space volumes are derived in detail.Taking Jiahe abandoned mine as the background,the volume and distribution of underground secondary space are calculated,and three heat storage evaluation models considering different water storage spaces are established by using COMSOL.The simulation results show that there are great differences among different models,and the results of the equivalent porous media model considering the multi-scale space are most consistent with the reality.Sensitivity analyses of key parameters model results indicated that the heat production is closely related to not only the recharge flow rate but also the recharge temperature and operating time.Furthermore,the energy saving and emission reduction benefits of geothermal utilization in abandoned mines are calculated,the results show that geothermal utilization of abandoned mines can effectively reduce energy consumption and CO_(2)emissions,and it has great economic benefits.展开更多
By the 21^(st) century,there have been many environmental problems exposed in China.Since the Chinese economic reform^([1]),agriculture^([2])and industry^([3])have undergone great transformation and development,which ...By the 21^(st) century,there have been many environmental problems exposed in China.Since the Chinese economic reform^([1]),agriculture^([2])and industry^([3])have undergone great transformation and development,which have affected the environment of public life.In the recent 15 years,some large (or important) cities have gradually transformed into a service economy and transferred heavy industrial factories.During this period,most factories were abandoned and deserted,which occupied the public space and affected the urban landscape.To some extent,they were abandoned by people because of the precipitation of other historical cultures or the influence of modern urbanization.However,these forgotten industrial factories witnessed the growth and development of a city,both its flourishing and decline.Currently,urban space becomes a people-oriented place that values the experience of individuals,rather than what is limited to the communication philosophy characterized by simplicity and functionalism^([4]).There is a discussion that gradually becomes hot,which is that methods to transform into a qualitative space for the experience of residents and visitors,as well as creating a pleasant public space.Meanwhile,the quality of urban space is an essential factor in evaluating modern cities,as an innovation-oriented and unified city.展开更多
基金supported by the Beijing Natural Science Foundation(8212033)the Fundamental Research Funds for the Central Universities(2021JCCXLJ05)innovation fund research project(SKLGDUEK202221).
文摘A large number of mines are closed or abandoned every year in China.Geothermal utilization is one of the important ways to efficiently reuse underground resources in abandoned mines.How to calculate the volume and distribution of underground water storage space is the key to accurately evaluate the sustainable geothermal production in abandoned mines.In this paper,according to the multi-scale characteristics of the underground space in abandoned mine,the flow and heat transfer equations in the multi-scale space are sorted out systematically,and the calculation methods of different secondary space volumes are derived in detail.Taking Jiahe abandoned mine as the background,the volume and distribution of underground secondary space are calculated,and three heat storage evaluation models considering different water storage spaces are established by using COMSOL.The simulation results show that there are great differences among different models,and the results of the equivalent porous media model considering the multi-scale space are most consistent with the reality.Sensitivity analyses of key parameters model results indicated that the heat production is closely related to not only the recharge flow rate but also the recharge temperature and operating time.Furthermore,the energy saving and emission reduction benefits of geothermal utilization in abandoned mines are calculated,the results show that geothermal utilization of abandoned mines can effectively reduce energy consumption and CO_(2)emissions,and it has great economic benefits.
文摘By the 21^(st) century,there have been many environmental problems exposed in China.Since the Chinese economic reform^([1]),agriculture^([2])and industry^([3])have undergone great transformation and development,which have affected the environment of public life.In the recent 15 years,some large (or important) cities have gradually transformed into a service economy and transferred heavy industrial factories.During this period,most factories were abandoned and deserted,which occupied the public space and affected the urban landscape.To some extent,they were abandoned by people because of the precipitation of other historical cultures or the influence of modern urbanization.However,these forgotten industrial factories witnessed the growth and development of a city,both its flourishing and decline.Currently,urban space becomes a people-oriented place that values the experience of individuals,rather than what is limited to the communication philosophy characterized by simplicity and functionalism^([4]).There is a discussion that gradually becomes hot,which is that methods to transform into a qualitative space for the experience of residents and visitors,as well as creating a pleasant public space.Meanwhile,the quality of urban space is an essential factor in evaluating modern cities,as an innovation-oriented and unified city.
