High-efficiency annular flow vinyl chloride converter

Abstract

The invention discloses a high-efficiency annular flow vinyl chloride converter which comprises an upper tube box, a shell, an upper tube plate, a lower tube plate, a heat exchange tube and a lower tube box and is characterized in that a central rod or a central tube is arranged in the heat exchange tube; and the upper end of the central rod or the central tube is fixed to the upper end of the heat exchange tube through a fixture, and the lower end of the central rod or the central tube is fixed to the inner wall of the heat exchange tube at the lower tube plate or a central positioning platewith through holes below the tube plate. The invention has the advantages that: the central rod or the central tube is arranged in the heat exchange tube; reaction gas flows from top to bottom in an annular flow in the heat exchange tube; the radial distribution condition of reaction heat is improved; the temperature of a central part of the heat exchange tube is reduced without changing the sizeof the original converter and the number of the heat exchange tube; compared with the conventional converter, the high-efficiency annular flow vinyl chloride converter has the advantages that the central temperature of the heat exchange tube can be reduced by over 20 DEG C, and the heat transfer efficiency is increased; thus, the reaction strength of the converter is improved; the yield of the converter is increased, and the production capacity of a single converter can be increased by over 55 percent; catalysts of the converter are saved; and over 3 tons of catalysts can be saved for producing 1 megaton of PVC (Poly Vinyl Chloride).

Description

technical field [0001] The invention belongs to chemical equipment, in particular to a high-efficiency annular flow vinyl chloride converter. Background technique [0002] The production of polyvinyl chloride (PVC) products is made by polymerization of vinyl chloride monomer (hereinafter referred to as VCM). There are two main methods for the production of VCM: ethylene oxychlorination and calcium carbide acetylene. my country currently adopts the calcium carbide acetylene method to produce polyvinyl chloride (PVC) production, which accounts for 75% of the country's total PVC production. In the production of vinyl chloride by calcium carbide acetylene method, the converter is the most important equipment. At present, domestic calcium carbide acetylene synthesis of vinyl chloride adopts fixed bed tubular converter, which belongs to large shell and tube heat exchanger in structure. The vinyl chloride synthesis reaction is carried out on the mercuric chloride catalyst with a...

AI Technical Summary

Problems solved by technology

The core of this patent is to install a central tube in the heat exchange tube. However, the patented technology has the following problems: 1. The central tube is equipped with springs and thorns, and the catalyst in the heat exchange tube cannot be pulled out for replacement; 2. The flower plate is far from the lower tube. The plate gap is too large (about 300mm), and the catalyst is wasted in the hollow part; 3. The key dimensions and specifications of the central tube and heat exchange tube are not limited, and the energy-saving and high-efficiency indicators cannot be well achieved

Based on the above reasons, the patented technology cannot form a new product, so it only stays in the design of the paper plan

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