Thermal-energy recycling system in spandex-spinning production process

Abstract

The invention relates to a thermal-energy recycling system in a spandex-spinning production process, which is used for recycling the thermal energy in the spandex-spinning production process, comprises a spinning shaft (1), a first wind pipe (2), a solvent recovering system (3), a heating-medium heater (4), a second wind pipe (5) and a heating-medium or electric heater (6) and is characterized inthat heat-pipe heat exchangers are provided with two stages or more than two stages, the two stages or more than two stage of heat-pipe heat exchangers are sequentially connected in series, working media with different boiling points are filled in each stage of heat-pipe heat exchanger, and the boiling points of the working media filled in each stage of heat-pipe heat exchanger are sequentially decreased under normal pressure. In the invention, a traditional first-stage heat-pipe heat exchanger is changed into the two stages or more than two stage of heat-pipe heat exchangers, and the workingmedia with different boiling points are used for replacing original demineralized water, so that the gas temperature at the hot side of the heat-pipe heat exchangers is further decreased, the gas temperature at the cold side is further increased, the heat recovery of a solvent system is increased to more than 70 percent from original 50 percent, the thermal energy is further recycled, the energy is saved, the emission is reduced, and the production cost is lowered.

Description

(1) Technical field [0001] The invention relates to a system for recovering and utilizing heat energy in the production process of spandex spinning. It is used for the recovery and utilization of heat energy in the production process of spandex spinning. (2) Background technology [0002] In the spandex spinning production process, the mass content of the polymer (polyurethane) in the spinning dope entering the spinning assembly is 35%, and the remaining 65% is the solvent DMAC (N,N-dimethylacetamide). After the spinning stock solution enters the upper spinning channel through the spinneret, the solvent DMAC in the stock solution needs to be quickly volatilized, and the remaining polymer is solidified and formed and undergoes processes such as the middle channel, the lower channel, false twisting, oiling, and winding. Finally made spandex fiber. [0003] In order to quickly volatilize the solvent DMAC in the dope that enters the spinning tunnel, the usual production proces...

AI Technical Summary

Problems solved by technology

[0006] The existing solvent recovery system uses a first-stage heat pipe heat exchanger. The medium filled in the heat pipe is desalinated water. Due to the influence of the boiling point of water (100°C under normal pressure), the temperature of the gas on the hot side of the heat pipe heat exchanger cannot be further reduced. (Currently reaching 98°C ~ 102°C), the gas temperature on the cold side cannot be further increased (no more than 102°C)

Images