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In the air-cooled refrigeration process, the degree of automatic control will be an important aspect of the technical level of the air-cooled refrigeration system. The automatic control of the system mainly includes the following contents: control and automatic adjustment of high-pressure pipelines and low-pressure pipelines; control of starting and stopping of turboexpanders and helium compressors; control and adjustment of turboexpander rotation speeds Control of switching and regeneration of helium gas dryer and helium purifier; control of vacuum of cold box and system, and control of system inflation; automatic measurement of pressure, temperature, flow and speed of the whole system, Printing and data storage; Replacing the compressor and turbo expander with the function of automatic quick stop; setting the automatic regulating valve to control its precision within the l% adjustment range.
The heat exchanger is designed as a plate-fin type, which has the advantages of large heat transfer area and high heat exchange efficiency. Based on thermal calculations, the primary, liquid nitrogen, and secondary heat exchangers are designed to have equal sections. The diameters of the inlet and outlet pipelines at different levels are designed in different sizes. On the one hand, this is based on the calculation of the relationship between the flow rate and the resistance. On the other hand, it also takes into account the ease of installation in the cold box and minimizes the cold loss. .
The outer tube of the Dewar tube is divided into two sections, each of which is plug-in type to facilitate assembly and overhaul of the inner tube. The seal between the two sections of the outer tube is designed as a special type of sealing structure that can seal both axially and radially. The housing of the cryogenic valve is made of stainless steel and processed in a liquid nitrogen-based manner. The valve core is inlaid with low-temperature-resistant polyamidite, and the latter is processed through a special mold.
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