What is the layout of the "three barrels of oil" in the explosion of the long-time energy storage track?
Under the trend of the times, PetroChina, Sinopec and CNOOC have combined their business advantages to promote the development of new energy business. Now, in the face of the increasingly hot long-time energy storage track, "three barrels of oil" and what layout?
PetroChina
"Since the 13th Five-Year Plan, PetroChina's research institutes and equipment manufacturing enterprises have been carrying out research on the preparation of advanced technologies such as electrochemical energy storage and compressed air energy storage in salt caverns, and have accumulated a number of key technologies in material development and equipment manufacturing.
With regard to the technology of all-vanadium liquid current battery with long time and large capacity, the Institute of Engineering Materials focuses on the improvement of core material modification, optimization of flow field structure design, breakthrough of assembly and sealing technology, and system integration of energy storage stack:
Developed a high stability and wide temperature range mixed-acid electrolyte system composed of sulfuric acid + fluoroboric acid + methanesulfonic acid + additives (H2SO4 + HBF4 + CH3SO3H + D-sorbitol), and the temperature range of the system has been expanded to -20~50℃ after optimization of the components;
Preparation of graphene and biomass electrocatalyst (nitrogen-doped carbon black ions) two-level modification of the multifunctionalization of graphite felt composite electrode (N-CB-G-GF), which significantly improves the fiber surface wettability, the specific surface area of the electrochemical reaction (＞ 43.28m2/g) and redox reversible activity, 200mA/cm2 current density battery charge and discharge to obtain the Coulombic efficiency of 96.5%, the voltage efficiency of 88% and the energy efficiency of 85%. 88% and energy efficiency of 85%;
Meanwhile, the Engineering Materials Research Institute adopts a combination of planar hot melt and laser welding sealing technology to ensure the internal and external sealing effect and operational stability of the power reactor.
Based on the above material modification and technology research, the Institute of Engineering Materials independently designed and integrated 500W/1000Wh all-vanadium liquid current battery stack, which has a Coulombic efficiency of 90.4%, a voltage efficiency of 88%, and an energy efficiency of 81% under the charge/discharge of 150mA/cm2 current density. It is proposed to build 10kW/10kWh all-vanadium liquid current battery energy storage system (supporting BMS and PCS and other monitoring, scheduling and security equipment) and 60kW photovoltaic supporting the construction of optical storage integration microgrid demonstration system, comprehensive verification and assessment of all-vanadium liquid current battery distribution and storage operational performance and economic benefits.
In terms of compressed air energy storage, PetroChina Engineering and Technology Research Institute Co., Ltd. after years of research, for salt cavern compressed air energy storage facing the high frequency of injection and extraction, injection and extraction of large volume of gas, relying on the National Key Laboratory of Oil and Gas Engineering, broke through the high-pressure oxygen corrosion of the technical bottleneck of the selection of materials for the tubing column, the development of a large size of corrosion-resistant completion packer and other technical products, the research and development of the large borehole cementation of low-temperature quick-setting and early-strengthening toughness The company has also developed a low-temperature, quick-setting, early-strengthening and toughness cement slurry system for large borehole cementing, constructed a theoretical system for evaluating the stability and tightness of old cavities in salt caverns, and formed a set of complementary technologies for the construction of compressed air energy storage underground projects in salt caverns with the key technologies of rebuilding energy storage reservoirs and large-size drilling and completions in the complex old cavities.
