Numerical Simulation Study On Enhancing The Efficiency Of Thermoelectric Power Generation

China is one of the countries with abundant geothermal resources globally,but the utilization ratio of geothermal resources is meager,especially geothermal power production.Sedimentary basins are rich in oil and geothermal,and oil fields are usually geothermal fields.The geological information in the oilfield area is vibrant.There are many exploration wells,production wells,and abandoned wells that can be transformed into geothermal wells,which reduce the geothermal drilling cost,and bring great convenience to the development and utilization of the associated geothermal energy in the oilfield.Thermoelectric power generation(TEG)technology can directly convert thermal energy into electrical energy.In this research,the numerical simulation method is used to study the efficiency improvement of thermoelectric power generation technology.The numerical model of the TEG chip is established by using the finite element software COMSOL Multiphysics.The heat transfer performance,internal resistance,output power,voltage,and other performance indexes of TEG chip are studied under the constant temperature boundary condition and constant flow boundary condition.Compared with the simulation results of constant temperature boundary condition,the simulation results of constant flow boundary condition fit well with the experimental results.The sensitivity analysis of the voltage and output power of the TEG chip is carried out.The influences of the cross-sectional area,thickness,and filling ratio of bismuth telluride particles on the performance of the TEG chip are studied.The results of numerical simulation show that when the thickness and filling ratio of bismuth telluride particles are constant,the voltage of the TEG chip decreases sharply with the increase of the cross-sectional area of particles.The maximum output power decreases slowly with the increase of the cross-sectional area of particles.The internal resistance of the TEG chip increases with the increase of thickness,but its voltage is almost the same.The output power decreases with the increase of thickness of thermoelectric particles.When the cross-sectional area and thickness of bismuth telluride particles are constant,the higher the filling ratio is,the higher the TEG chip's internal resistance.The voltage and power increase with the increase of filling ratio,and they are linearly related.Based on the TEG chip model,the physical model and numerical model of the thermoelectric power generation(TEG)system are established.The experimental and numerical simulations of three different TEG systems are carried out,and the experimental data are compared with the numerical simulation results,which show that the simulation results are well-fitted.This research analyzes the feasibility of the development and utilization of thermoelectric power generation(TEG)in the associated geothermal energy of the oil field.It also discusses the advantages,disadvantages and the influencing factors of the development and utilization of associated geothermal power generation of the oil field.Taking the XLJ1 well of Huabei oil field as the research object,the installed capacity of TEG systems is calculated according to the existing technical level.