SYSTEM OF THE LOW-TEMPERATURE CONDENSATION OF THE STEAM-GAS MIXTURE

摘要

The invention relates to a polycrystalline silicon production area, in particular to equipment for condensing the low-temperature gas mixture, formed on the portion of trichlorosilane synthesis. Developed cryogenic condensation system of the steam-gas mixture formed in the area of ​​synthesis of trichlorosilane, connected in a gas phase with the primary condensing system vapor mixture, comprising two cooled recuperative heat exchanger, the inputs of which via conduits capable of connecting to the gas phase to the system main condensation, cooling is applied CCGT mixture, condenser, cooled by liquid nitrogen to which said recuperative those communicated through conduits by gas phase ploobmenniki at least one container for collecting condensate, which by means of conduits communicate recuperative heat exchangers and the condenser, at least one tank for storing liquid nitrogen, in communication via a conduit with a capacitor, wherein the pipes are fitted with a controlled shut-off valves and recuperative heat exchanger are connected by the gas phase to the main system condensing the gas-vapor mixture in parallel to each other, wherein for cooling the gas-vapor mixture in a recuperative heat bmennike used vaporized stream of nitrogen while cooling the condenser, and the second indirect heat exchanger - the return flow of cooled gas. Thus, the inventive system is a low-temperature condensation of vapor-gas mixture through the optimal selection of the Elements, and also ensure the most efficient communication between these elements enables efficient condensation of chlorosilanes from gas-vapor mixture, efficient recovery of cold gaseous refrigerant in the recuperative heat exchangers, simplification of the construction in general and reduced cost of the system cryogenic condensation.