[Objectives]This study was conducted to explore the effects of planting density,fertilizer type and fertilizer amount on yield of Jicaidou No.1.[Methods]Three treatments of plant spacing,fertilizer type and fertilizer...[Objectives]This study was conducted to explore the effects of planting density,fertilizer type and fertilizer amount on yield of Jicaidou No.1.[Methods]Three treatments of plant spacing,fertilizer type and fertilizer amount of Jicaidou No.1 were set up respectively to screen out the best combination mode.[Results]The best combination mode was:plant spacing 50 cm,fertilizer amount 1800 kg/hm^(2),and any one of the two fertilizers,as the difference between the two kinds of fertilizers was not significant.[Conclusions]This study provides a scientific basis for the standardized cultivation of kidney beans in Jilin Province.展开更多
In this paper,we reviewed the classification,genetic diversity and planting and application of snap bean(Phaseolus vulgaris)germplasm resources in China at the present stage were,analyzed the bottleneck of snap bean r...In this paper,we reviewed the classification,genetic diversity and planting and application of snap bean(Phaseolus vulgaris)germplasm resources in China at the present stage were,analyzed the bottleneck of snap bean research in China,and prospected the development trend of snap bean germplasm research in the future.In the opportunity of the completion of the whole genome sequencing of kidney bean and the construction of high-density genetic map,it is necessary to strengthen the application of ISSR,SNP and other molecular methods and high-throughput proteomics to the study on the specific breeding of snap bean.展开更多
Methanol to olefins (MTO) plays a crucial role to transform non-oil resources into light olefins. Combined with the kinetics of MTO reaction process, a high-speed loop reactor (HSLR) is explored. The solids hydrodynam...Methanol to olefins (MTO) plays a crucial role to transform non-oil resources into light olefins. Combined with the kinetics of MTO reaction process, a high-speed loop reactor (HSLR) is explored. The solids hydrodynamics including the uniformity distribution, fluidization quality, backmixing and carryover are systematically analyzed in detail. Moreover, the gas-solid hydrodynamics in the HSLR are coupled with the MTO reaction kinetics, and the methanol conversion and yields of light olefins are both predicted and compared in the HSLR and free fluidized bed (FFB). The results demonstrate that the particles distribute more uniform in the different regions of HSLR than that of FFB and the overall fluidization quality of particles is high in the HSLR. The overall non-uniformity index in the HSLR varies from 0.1 to 0.18 kPa and that in the FFB changes from 0.2 to 0.35 kPa when the superficial gas velocity is 1.03 m/s and the solids circulation flux equals to 90.9 kg/(m^(2) s). Meanwhile, the ratio of solids backmixing and carryover in the HSLR are both lower than that in the FFB. Finally, the hydrodynamics in HSLR are coupled with the five-lumped reaction kinetics for MTO. Based on the coupled model, it is predicted that both the methanol conversion and the yields of light olefins in the HSLR are higher than that in the FFB. The maximum difference between the methanol conversion and the light olefin yields in the HSLR and that in the FFB is 6.2 % and 0.000803 mol/L when the superficial gas velocity Ug is 0.87 m/s, which demonstrates the superiority of HSLR for MTO reaction.展开更多
Fischer-Tropsch(F-T)synthesis is an important route to achieve the clean fuel production.The perfor-mance of gas-liquid separation equipment involving in the progressive condensation and separation of light and heavy ...Fischer-Tropsch(F-T)synthesis is an important route to achieve the clean fuel production.The perfor-mance of gas-liquid separation equipment involving in the progressive condensation and separation of light and heavy hydrocarbons in the oil-gas products has become a bottleneck restricting the smooth operation of the F-T process.In order to remove the bottleneck,a gas-liquid vortex separator with simple structure,low pressure drop and big separation capacity was designed to achieve the efficient separation between gas and droplets for a long period.The RSM(Reynolds Stress Model)and DPM(Discrete Phase Method)are employed to simulate the flow characteristics and liquid distribution in the separator.The results show that the separation efficiency is influenced by the flow field and liquid phase concentration in the annular zone.The transverse vortex at the top of spiral arm entrains the droplets with small diam-eter into the upper annular zone.The entrained droplets rotate upward at an angle of about 37.4°.The screw pitch between neighbor liquid threads is about 0.3 m.There is a top liquid ring in the top of annular zone,where the higher is the liquid phase concentration,the lower is the separation efficiency.It is found that by changing the operating condition and the annular zone height the vortex can be strengthened but not enlarged by the inlet velocity.The screw pitch is not affected by both inlet velocity and annular zone height.The liquid phase concentration in the top liquid ring decreases with both the increases of inlet velocity and annular zone height.The total pressure drop is almost not affected by the annular zone height but is obviously affected by the inlet velocity.When the height of annular zone is more than 940 mm,the separation efficiency is not changed.Therefore,the annular zone height of 940 mm is thought to be the most economical design.展开更多
文摘[Objectives]This study was conducted to explore the effects of planting density,fertilizer type and fertilizer amount on yield of Jicaidou No.1.[Methods]Three treatments of plant spacing,fertilizer type and fertilizer amount of Jicaidou No.1 were set up respectively to screen out the best combination mode.[Results]The best combination mode was:plant spacing 50 cm,fertilizer amount 1800 kg/hm^(2),and any one of the two fertilizers,as the difference between the two kinds of fertilizers was not significant.[Conclusions]This study provides a scientific basis for the standardized cultivation of kidney beans in Jilin Province.
基金Supported by Jilin Provincial Science and Technology Development Program:International Science and Technology Cooperation(20200801075GH)Jilin Provincial Agricultural Science and Technology Innovation Project(CXGC2021ZY101)。
文摘In this paper,we reviewed the classification,genetic diversity and planting and application of snap bean(Phaseolus vulgaris)germplasm resources in China at the present stage were,analyzed the bottleneck of snap bean research in China,and prospected the development trend of snap bean germplasm research in the future.In the opportunity of the completion of the whole genome sequencing of kidney bean and the construction of high-density genetic map,it is necessary to strengthen the application of ISSR,SNP and other molecular methods and high-throughput proteomics to the study on the specific breeding of snap bean.
基金support the Scientific Research Project of Hubei Provincial Department of Education(grant No.Q20214301).
文摘Methanol to olefins (MTO) plays a crucial role to transform non-oil resources into light olefins. Combined with the kinetics of MTO reaction process, a high-speed loop reactor (HSLR) is explored. The solids hydrodynamics including the uniformity distribution, fluidization quality, backmixing and carryover are systematically analyzed in detail. Moreover, the gas-solid hydrodynamics in the HSLR are coupled with the MTO reaction kinetics, and the methanol conversion and yields of light olefins are both predicted and compared in the HSLR and free fluidized bed (FFB). The results demonstrate that the particles distribute more uniform in the different regions of HSLR than that of FFB and the overall fluidization quality of particles is high in the HSLR. The overall non-uniformity index in the HSLR varies from 0.1 to 0.18 kPa and that in the FFB changes from 0.2 to 0.35 kPa when the superficial gas velocity is 1.03 m/s and the solids circulation flux equals to 90.9 kg/(m^(2) s). Meanwhile, the ratio of solids backmixing and carryover in the HSLR are both lower than that in the FFB. Finally, the hydrodynamics in HSLR are coupled with the five-lumped reaction kinetics for MTO. Based on the coupled model, it is predicted that both the methanol conversion and the yields of light olefins in the HSLR are higher than that in the FFB. The maximum difference between the methanol conversion and the light olefin yields in the HSLR and that in the FFB is 6.2 % and 0.000803 mol/L when the superficial gas velocity Ug is 0.87 m/s, which demonstrates the superiority of HSLR for MTO reaction.
基金supports from the National Natural Science Foundation of China(grant nos.21706280,U1862202,91834303,21961132026).
文摘Fischer-Tropsch(F-T)synthesis is an important route to achieve the clean fuel production.The perfor-mance of gas-liquid separation equipment involving in the progressive condensation and separation of light and heavy hydrocarbons in the oil-gas products has become a bottleneck restricting the smooth operation of the F-T process.In order to remove the bottleneck,a gas-liquid vortex separator with simple structure,low pressure drop and big separation capacity was designed to achieve the efficient separation between gas and droplets for a long period.The RSM(Reynolds Stress Model)and DPM(Discrete Phase Method)are employed to simulate the flow characteristics and liquid distribution in the separator.The results show that the separation efficiency is influenced by the flow field and liquid phase concentration in the annular zone.The transverse vortex at the top of spiral arm entrains the droplets with small diam-eter into the upper annular zone.The entrained droplets rotate upward at an angle of about 37.4°.The screw pitch between neighbor liquid threads is about 0.3 m.There is a top liquid ring in the top of annular zone,where the higher is the liquid phase concentration,the lower is the separation efficiency.It is found that by changing the operating condition and the annular zone height the vortex can be strengthened but not enlarged by the inlet velocity.The screw pitch is not affected by both inlet velocity and annular zone height.The liquid phase concentration in the top liquid ring decreases with both the increases of inlet velocity and annular zone height.The total pressure drop is almost not affected by the annular zone height but is obviously affected by the inlet velocity.When the height of annular zone is more than 940 mm,the separation efficiency is not changed.Therefore,the annular zone height of 940 mm is thought to be the most economical design.
