3results about How to "Large fluctuations" patented technology

This invention relates to a boron-doped multi-element polyanionic sodium-ion battery cathode material and its preparation method, comprising the following steps: [The method involves] mixing Na₄Fe₂O₃ with... 3‑X B X (PO4) 2‑Y (SiO4) Y The stoichiometric ratio of P2O7 is determined by adding ferrous source, boric acid, sodium source, phosphorus source, and silicon source to water, followed by the addition of carbon source and mixing thoroughly to obtain a mixed slurry; wherein 0.2≤X≤0.5, 0<Y≤1; the mixed slurry is then ground to obtain a sand-milled slurry; the sand-milled slurry is dried to obtain precursor powder; under a protective atmosphere, the precursor powder is sintered at 450~550℃ to obtain boron-doped multi-element polyanion sodium-ion battery cathode material. The introduction of boron and silicon elements in this invention helps reduce raw material costs, improve the electrochemical performance of the material, especially enhancing the structural stability, rate performance, and cycle life of the cathode material, and also lowers the sintering temperature, meeting the requirements for cost reduction and efficiency improvement.

The present application relates to the technical field of petroleum chemical industry, in particular to an automatic execution system and method for the material returning process of an ethylene cracking furnace, which comprises a state confirmation module before material returning, used for confirming initial parameters before material returning, and when the initial parameters are within an initial range, indicating that material returning can be performed, and when the initial parameters are not within the initial range, giving an alarm; a material returning process control module, used for controlling key parameters of material returning in the material returning stage, and issuing a material returning instruction, wherein the key parameters of material returning include the material returning rate of a single pipe of a furnace chamber and the material returning rate of a total pipe of the furnace chamber; and a material returning module, used for receiving the material returning instruction and performing material returning. By using the system, the state before material returning is confirmed by the state confirmation module before material returning, and the key parameters of material returning in the material returning process are controlled by the material returning process control module, which can effectively improve the accuracy of material returning, and has the advantages of high material returning efficiency, high safety and small fluctuation.

This invention provides a heat exchange tube and a heat exchanger. The heat exchange tube includes a tube body, an outer fin structure, and an inner rib structure. The heat exchange tube and heat exchanger provided by this invention have an outer fin structure on the outer wall of the tube body. This outer fin structure disturbs the fluid flowing through the outer wall of the tube body, causing the fluid to drip off the outer fin structure. This avoids the problem of fluid accumulating on the lower side of the tube body due to gravity within the channels defined by the outer fin structure, and also avoids fluid bridging between adjacent outer fin structures that could submerge the heat exchange area, thereby improving the external heat exchange efficiency of the heat exchange tube. Furthermore, an inner rib structure is provided on the inner wall of the tube body, forming a first spiral flow channel and a second spiral flow channel. This secondary disturbance increases the fluid ripple at the inner wall of the tube body. The outer fin structure and the inner rib structure enhance heat exchange in the heat exchange tube, thereby effectively improving the heat exchange efficiency of the heat exchange tube.