Polyamide-6 granula nitrogen drying heat exchange system

Abstract

The invention provides a polyamide-6 granula nitrogen drying heat exchange system. Damp and hot nitrogen is discharged from the top of a drying tower and is conveyed to a first nitrogen circulating fan via a nitrogen filter; nitrogen coming out from the first nitrogen circulating fan is divided into two parts; one part enters a spray cooling system via a nitrogen heat exchanger and the other part is conveyed to a nitrogen inlet in the middle of the drying tower after being heated by a first nitrogen heater; the nitrogen in the spraying cooling system is discharged from a nitrogen outlet after being cooled, passes through the nitrogen heat exchanger, a second nitrogen circulating fan, a nitrogen purifying device and a second nitrogen heater in order and is divided into two parts at the outlet of the second nitrogen heater, the two parts entering the drying tower via two nitrogen inlets at a taper sealing head at the bottom of the drying tower; wet polyamide-6 granulas enter the drying tower from the top of the drying tower and are discharged from the bottom end of the drying tower after drying to a polyamide-6 granula cooling bin system. The system is characterized in that the objective of heat exchange is achieved by using high-temperature damp and hot nitrogen to heat low-temperature nitrogen, so that energy is comprehensively utilized, energy consumption is reduced and the production cost is reduced.

Description

technical field [0001] The invention specifically relates to a nitrogen drying heat exchange system for nylon 6 slices. Background technique [0002] Polyamide 6 slices, commonly known as nylon 6 slices, nylon 6 slices. Because the macromolecule contains amide bonds (-C-NH-), it is called polyamide. Nylon 6 slices are usually white columnar particles, with a melting point of 210-220°C and a decomposition temperature of about 300°C. Soluble in phenol and hot concentrated sulfuric acid, excellent electrical insulation performance, good alkali resistance and corrosion resistance. Nylon is the fiber with the best wear resistance among synthetic fibers. Because of its excellent wear resistance and corrosion resistance, it has become the main raw material for car tire dipped cord fabrics. Nylon 6 is produced using caprolactam solids as raw materials, through melting, batching, pre-polymerization, polymerization, injection tape slicing, extraction, and drying be made of. [00...

AI Technical Summary

Problems solved by technology

In the process of drying with nitrogen, the nitrogen needs to be heated, which consumes a lot of heat energy, while the nitrogen dehumidification process requires a cooler to cool down, and the energy is not comprehensively utilized, resulting in a large energy waste

The circulating nitrogen gas discharged from the top of the drying tower contains a large amount of water, which must be cooled by the spray tower to remove the water. The nitrogen gas after passing through the spray tower needs to be reheated because of the low temperature and returned to the bottom of the drying tower for reuse, which consumes too much energy. high

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