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This utility model relates to the field of modified starch processing technology and discloses a reaction vessel for modified starch processing, including a reaction vessel structure and a support structure installed on the outer surface of the reaction vessel structure. Connecting block A and connecting block B are installed on the outer surface of a hollow ring. A connecting hole is opened through the middle of the connecting block B. A liquid inlet pipe is installed on the outer surface of the movable ring, and the inside of the liquid inlet pipe communicates with the inside of the connecting hole. A spray pipe is installed through the bottom of the hollow ring. A water pipe is connected to the liquid inlet pipe. First, the inside of the vessel is rinsed with a large amount of clean water to remove most of the dissolved or undissolved starch. An appropriate amount of acidic cleaning agent is used, diluted and added to the vessel, and soaked for a certain period of time. The acidic cleaning agent can effectively remove the carbohydrate residue of starch and reduce the sediment after starch hydrolysis. After acidic cleaning, an alkaline cleaning agent is needed to neutralize the acidic residue in the vessel. Then, the vessel is rinsed with clean water to ensure that there is no alkaline cleaning agent residue.

This utility model relates to the technical field of heat exchangers, and in particular to a shock-resistant and buffered tubular heat exchanger, comprising: a heat exchanger shell and a flow guiding assembly. The heat exchanger shell is mounted on a support assembly. Fixed tube sheets are rotatably mounted at both ends of the shaft cavity of the heat exchanger shell. Heat exchange tube bundles are installed in mounting holes coaxially arranged in the two sets of fixed tube sheets. A tube box is mounted on a fixing component by bolts. A partition plate is installed inside the tube box. The partition plate is mounted on the fixed tube sheets and divides the multiple sets of heat exchange tube bundles symmetrically arranged in the fixed tube sheets into two groups. The partition plate divides the inner cavity of the tube box into two sets of slots, and the shaft hole is located in one of the slots. The flow guiding assembly is mounted on the heat exchanger shell and communicates with the two sets of slots of the partition plate. A floating head is installed on the fixed tube sheet at the output end of the heat exchanger shell. A drive assembly is mounted on the heat exchanger shell and is used to provide rotational power to the fixed tube sheets. This improves heat exchange efficiency and reduces equipment energy consumption.

This invention discloses a powder coating for metal coils and its preparation method, belonging to the field of powder coating technology. This invention combines carboxyl-terminated polyester resin, epoxy resin, and modified polyimide, which significantly improves the coating's adhesion, flexibility, and bending resistance. Furthermore, the added modified filler A is a cerium and zirconium synergistically intercalated modified montmorillonite, which not only acts as a corrosion inhibitor, increasing the coating's corrosion resistance, but also helps delay the photo-oxidative degradation of the resin matrix, achieving better weather resistance. Zirconium also increases the interlayer spacing of montmorillonite, facilitating the uniform dispersion and anchoring of cerium ions within the montmorillonite framework, effectively extending the diffusion path of corrosive media. Modified filler A and modified filler B work synergistically to form effective physical barriers and chemical effects, achieving better weather resistance and corrosion resistance. Overall, the powder coating prepared exhibits excellent adhesion, weather resistance, and corrosion resistance.