| Under the dual pressures of our country's heavy dependence on imports for oil resources and global energy conservation and emission reduction,it is imperative to improve the efficiency of oil extraction and reduce the cost of oil extraction.The oil field hot car wash has a very important impact on the efficiency and cost of oil field development.In the background of the existing oil field hot car wash vehicle boiler structure is bulky,the combustion efficiency is low,and the emission pollution is serious,an internal combustion steam generating device is introduced.Since the combustion of internal combustion engines has the characteristics of high efficiency and cleanliness,it is a feasible way to improve the cleaning efficiency of oil wells,realize the lightweight of the hot wash body,reduce the emission of hazards,and improve the combustion efficiency and economic efficiency of the hot wash vehicle boiler.It is worth thinking about and trying.The internal combustion steam generator is a vehicle-mounted internal combustion steam generator that uses the engine of the hot car wash itself as a heat source to replace an external combustion boiler.It saves energy and reduces major national needs,reduces enterprise manufacturing costs,and greatly reduces product structure size.Considering the complexity of the system,the application of internal combustion steam generators has important practical significance.This paper is based on the patent project of internal combustion steam generating device in cooperation between school and enterprise.Through the calculation of mechanical structure parameters and performance simulation study of the key component of the internal combustion steam generating device of the new vehicle-mounted boiler internal combustion steam generating device-shaft power heat conversion and utilization unit,the determination and optimization are determined and optimized.The relevant parameters of the hydraulic heater.A suitable control strategy is formulated to realize the power control of the hydraulic heater.The relevant parameters of the plate heat exchanger were determined and verified,and the thermal cycle process of the shaft work heat conversion and utilization unit was studied.The following is the main work content:1.According to the design analysis principle of the hydraulic coupler,the hydraulic heater is analyzed and designed.The mechanical structure of the hydrodynamic heater was designed,and the relevant structural parameters were determined.It was preliminarily determined that the diameter of the circulation circle was 386mm,the number of moving wheel blades was 29,the number of fixed wheel blades was 27,and the moving wheel and fixed wheel blades were all curved blades,with a radial inclination angle.Is 35°.Then,according to the heat load requirements of the working fluid of the shaft work heat conversion and utilization unit,a plate heat exchanger with a heat exchange area of 11.5m2 was determined by calculation,and the relevant parameters of the plate heat exchanger were determined.2.In order to optimize the torque performance and heating performance of the hydraulic heater,the CFD simulation calculation of the internal flow field of the hydraulic heater was carried out,and the effect of the blade parameters on the torque performance and heating performance of the hydraulic heater was studied.influences.The torque performance and heating performance of the hydraulic heater increase with the increase of the blade inclination angle and the increase of the number of blades.When the blade inclination angle is 45°and the number of fixed and fixed wheel blades is 33-31,the hydraulic heater has the best Excellent torque performance and heating performance.Under the blade parameters,when the rotating wheel speed is 2500r/min,the maximum torque is 4034.88Nm,the maximum torque coefficient is 1.3477*10-4,and the maximum turbulent flow energy is 97.92m/s2.On the basis of the blade parameters,the influence of different filling rates on the torque of the hydraulic heater was studied,and the torque characteristics of the heater were obtained.The study found that the torque of the fluid inside the hydraulic heater increased with the filling rate.3.In order to further improve the matching efficiency and torque performance of the hydraulic heater and the engine,according to the torque characteristics of the hydraulic heater obtained by the simulation and the working characteristics of the engine,the matching work calculation and analysis are carried out,and the genetic algorithm is used to calculate the circle diameter and The working fluid is selected for optimization calculation,so that the matching interval of the two is concentrated in the efficient working area of the engine.Finally,it is determined that the circulating circle diameter of the hydraulic heater is 386mm,the working oil is selected as No.46 hydraulic oil,and the density is 890 kg/m3.4.In order to study the matching work between the hydraulic heater and the engine,a simulation model was built in SIMULINK using the derived mathematical model of the hydraulic heater,and the matching of the hydraulic heater and the rated power of the engine was carried out.Co-simulation,the simulation result is that the maximum heating power of the hydraulic heater is 240k W,the speed is 1600r/min,and the torque is 1432.5Nm when the hydraulic heater is fully filled with the engine rated power.In order to control the torque of the hydraulic heater to obtain the desired heating power,a fuzzy control rule is established that takes the target power as input and adjusts the filling amount as output.A four-level power error domain is formulated,and the control effect is better than Ordinary fuzzy control has shorter control time and smaller overshoot.5.In order to verify whether the heat exchange effect of the heat exchanger meets the working conditions,a heat cycle model of the shaft work heat conversion and utilization unit was built in AMESim to measure the temperature difference between the oil before and after flowing through the heat exchanger and the working fluid in the stable cycle.The temperature obtained by the heat exchanger through which the water flows was simulated.The simulation result is that when the input heating power is 240k W,the rotational speeds of the thermal hydraulic pump are 1600r/min,1400r/min,1200r/min,and the highest before the oil flows through the heat exchanger are 120°C,116°C,and 109°C.The temperature difference before and after is 30?,35?and 38?respectively.The temperature of the oil is maintained at the optimum working temperature range,which proves that the heat exchanger has a good match.6.The energy of the three parts of the internal combustion steam generation system cooling system utilization unit,exhaust gas utilization unit and shaft power heat conversion utilization unit are balanced.According to the characteristics of temperature and flow,the working fluid generation process is matched,and the working fluid generation process is matched.The conversion efficiency of the internal combustion type steam generator is calculated separately under the conditions and the quantity of working fluid.When the engine is rated at 2000r/min and 1204Nm,the conversion efficiency of the internal combustion evaporation system is 86.29%,which is higher than the thermal efficiency of the burner of the traditional hot car wash vehicle boiler of 81.5%. |
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