Research On Two-step Double-loop Solar Direct Steam Generation (DSG) Technology

From the point of energy consumption structure, our country is the world’s largest coal consumer, coal consumption accounted for about67%of the total energy consumption, it is the main reason of serious environmental pollution and the ecological deterioration increased year by year in our country. In recent years, the hazy weather is nationwide serious, our demand for clean energy more and more strong. As a kind of limitless reserve of clean energy, solar energy first attracted the interest of the researchers. it has a great strategic significance in developing and utilizing solar energy for China’s economic and social sustainable development and protection of ecological environment and solve the population of remote areas without electricity, and some special purpose. Solar thermal power generation system is harmonious with the ecological environment of the clean energy utilization system without consumption of fossil energy and pollutants. Since the early1980’s after the successful research, the current us11large commercial systems in parallel operation, a total installed capacity of about365000kilowatts through continuous development and improvement. Japan, France, Israel, Italy, Spain, Germany, the former Soviet union, Australia and other countries also positively carried out the research and development work, and constructed of the experimental demonstration system. Research demonstrated that development tower systems and disc type system is technically feasible, economically also will be promising.First of all, this article makes a careful investigation in solar power status at home and abroad, respectively introduces the four kinds of technologies, adopted by the solar power trough type solar thermal technology, solar thermal power generation technology, disc tower solar thermal power generation technology and linear Fresnel type solar thermal power generation technology. Secondly, this article respectively analyzed the basic problem of solar power systems and direct steam heat transfer characteristics of solar collector, and discussed the heat transfer model of the solar collector. This article also studied two step binary directly the performance of the steam thermal system, model of two steps thermal system directly of steam are given.Finally, aiming at the key control problem of direct steam generation techniques, an improved PID controller is designed on the spray valve control, and analyzes its stability in theory,the simulation results show that the controller has certain feasibility and application value.