Spinning chemical fiber production process principle and pollution source analysis

The production of chemical fiber filaments is divided into melt direct spinning and chip indirect spinning processes. Usually PTA powder and EG are used to make polyester melt or polyester chips processed after polymerization for spinning. After the melt is distributed and metered, the spinning components are extruded from the spinneret (plate) into a liquid stream. After ring blowing and cooling, the spinning stream is sprayed out of the spinneret hole and then cooled and shaped in cooling air, and then wound down to the barrel (tow oiling, guide wire bundling, pulling down barrel and reciprocating traverse). Because of the low orientation, low strength and elongation of the newly formed wound yarn up to several hundred percent, the dimensional stability is poor, and it has no practical value. Therefore, the winding yarn must be stretched to improve the order of molecular arrangement, so that the fiber can obtain sufficient strength and appropriate elongation to adapt to various uses.


In the post-spinning processing process, through spinning bundle oiling, traction drawing, relaxation and tension heat setting and other process links, spinning through the hot roller will produce oil waste gas. The composition of spinning oil used in polyester filament is: nonionic surfactant and anionic surfactant, the composition is relatively simple.


(1) FDY (full drawn wire) smoke analysis

In the production process of FDY, it passes through heating rollers. FDY is stretched by one heating roller and shaped by two heating rollers. While passing through the heating roller, the spinning finish on the spinning surface is heated and volatilized to form oil fume, which is then exhausted by the end fan. According to the on-site survey results, at this stage, the FDY production line mainly adopts two brands, TMT and BARMAG (Barmag). Through the measurement of the oil fume temperature of the production lines of several companies, it can be seen that the temperature of the oil fume discharged from the TMT production line is concentrated between 70-80 ℃ , BARMAG can be regarded as normal temperature (depending on the specific situation). The amount of flue gas can be preliminarily determined according to the number of stations in the production line. For example, the oily fume volume of the TMT brand 12-head and 36-bit production line is about 15000M3/H; the BARMAG brand 24-bite, the 36-bit production line's oily fume is about 10000M3/H. The above is the flue gas volume of the production line with more commonly used specifications, which will increase or decrease slightly according to the different flue gas volume of the production line station.


(2) POY (pre-oriented wire) smoke analysis

POY is generally used as a raw yarn for the production of stretched yarn. Because there is no heating roller in the POY production process, the amount of soot produced is almost no. Mainly in the process of extruding the melt, a little smoke will be generated.

(3)DTY (Textured Wire) Smoke Analysis

POY undergoes stretching deformation, heat setting and other changes under the action of heating, stretching force, and twisting force in a hot box. Then, after the heat setting of the fixed thread of the cooling plate, the final twisting becomes DTY, and the spinning finish on the surface of the POY is heated and volatilized into oil fume.


The equipment of this scheme adopts the high-efficiency electrostatic patent honeycomb oil fume purification equipment of KLEAN and the multi-faceted tube heat exchange type cooling equipment.

The industrial electrostatic oil fume purification equipment is composed of a cabinet, a main control box, an intelligent digital power supply, a patented water-resistant stainless steel electric field, a porous air baffle, and an over-temperature detection circuit and a PLC control circuit installed in the main control box;


According to the characteristics of the flue gas, our company provides the following treatment solutions:

Ventilation system (fume hood, pipe) + pretreatment system (cooling and condensation) + main purification system (electrostatic capture) + extraction system (terminal fan pipe, chimney)

Production line Main duct Fire damper Fire damper Efficient electrostatic deodorization Fire damper Exhaust Fan



Process Description


                                          ①Production line   ②Main duct   Fire damper   ④Cooler  ⑤Electrostatic Precipitator  ⑥Deodorizer   ⑦Fire damper   Exhaust Fan 


Smoke collection system

The oily fume and exhaust gas emitted from the spinning production line are usually collected by a fume hood, and then collected by the fume collector and then collected into a main pipe


Cooling and condensation

The flue gas is transported through the pipeline to the cooling and condensing device, and the temperature of the flue gas is reduced from 80°C to below 40°C through heat exchange, and part of the oil fume is aggregated into large particles through condensation to initially settle down


Electrostatic adsorption system

The purification equipment uses the electrons emitted by the cathode in the high-voltage electric field and the negative ions generated by the electrons colliding with air molecules to capture the oil fume particles and charge them, and then use the electric field to make the charged oil fume particles adsorbed by the anode and drain through the bottom of the equipment. Mouth discharge;


Extraction system

The purified smoke is directly discharged through the chimney






Spinning chemical fiber production process principle and pollution source analysis

The production of chemical fiber filaments is divided into melt direct spinning and chip indirect spinning processes. Usually PTA powder and EG are used to make polyester melt or polyester chips processed after polymerization for spinning. After the melt is distributed and metered, the spinning components are extruded from the spinneret (plate) into a liquid stream. After ring blowing and cooling, the spinning stream is sprayed out of the spinneret hole and then cooled and shaped in cooling air, and then wound down to the barrel (tow oiling, guide wire bundling, pulling down barrel and reciprocating traverse). Because of the low orientation, low strength and elongation of the newly formed wound yarn up to several hundred percent, the dimensional stability is poor, and it has no practical value. Therefore, the winding yarn must be stretched to improve the order of molecular arrangement, so that the fiber can obtain sufficient strength and appropriate elongation to adapt to various uses.


In the post-spinning processing process, through spinning bundle oiling, traction drawing, relaxation and tension heat setting and other process links, spinning through the hot roller will produce oil waste gas. The composition of spinning oil used in polyester filament is: nonionic surfactant and anionic surfactant, the composition is relatively simple.


(1) FDY (full drawn wire) smoke analysis

In the production process of FDY, it passes through heating rollers. FDY is stretched by one heating roller and shaped by two heating rollers. While passing through the heating roller, the spinning finish on the spinning surface is heated and volatilized to form oil fume, which is then exhausted by the end fan. According to the on-site survey results, at this stage, the FDY production line mainly adopts two brands, TMT and BARMAG (Barmag). Through the measurement of the oil fume temperature of the production lines of several companies, it can be seen that the temperature of the oil fume discharged from the TMT production line is concentrated between 70-80 ℃ , BARMAG can be regarded as normal temperature (depending on the specific situation). The amount of flue gas can be preliminarily determined according to the number of stations in the production line. For example, the oily fume volume of the TMT brand 12-head and 36-bit production line is about 15000M3/H; the BARMAG brand 24-bite, the 36-bit production line's oily fume is about 10000M3/H. The above is the flue gas volume of the production line with more commonly used specifications, which will increase or decrease slightly according to the different flue gas volume of the production line station.


(2) POY (pre-oriented wire) smoke analysis

POY is generally used as a raw yarn for the production of stretched yarn. Because there is no heating roller in the POY production process, the amount of soot produced is almost no. Mainly in the process of extruding the melt, a little smoke will be generated.

(3)DTY (Textured Wire) Smoke Analysis

POY undergoes stretching deformation, heat setting and other changes under the action of heating, stretching force, and twisting force in a hot box. Then, after the heat setting of the fixed thread of the cooling plate, the final twisting becomes DTY, and the spinning finish on the surface of the POY is heated and volatilized into oil fume.


The equipment of this scheme adopts the high-efficiency electrostatic patent honeycomb oil fume purification equipment of KLEAN and the multi-faceted tube heat exchange type cooling equipment.

The industrial electrostatic oil fume purification equipment is composed of a cabinet, a main control box, an intelligent digital power supply, a patented water-resistant stainless steel electric field, a porous air baffle, and an over-temperature detection circuit and a PLC control circuit installed in the main control box;


According to the characteristics of the flue gas, our company provides the following treatment solutions:

Ventilation system (fume hood, pipe) + pretreatment system (cooling and condensation) + main purification system (electrostatic capture) + extraction system (terminal fan pipe, chimney)

Production line Main duct Fire damper Fire damper Efficient electrostatic deodorization Fire damper Exhaust Fan



Process Description


                                          ①Production line   ②Main duct   Fire damper   ④Cooler  ⑤Electrostatic Precipitator  ⑥Deodorizer   ⑦Fire damper   Exhaust Fan 


Smoke collection system

The oily fume and exhaust gas emitted from the spinning production line are usually collected by a fume hood, and then collected by the fume collector and then collected into a main pipe


Cooling and condensation

The flue gas is transported through the pipeline to the cooling and condensing device, and the temperature of the flue gas is reduced from 80°C to below 40°C through heat exchange, and part of the oil fume is aggregated into large particles through condensation to initially settle down


Electrostatic adsorption system

The purification equipment uses the electrons emitted by the cathode in the high-voltage electric field and the negative ions generated by the electrons colliding with air molecules to capture the oil fume particles and charge them, and then use the electric field to make the charged oil fume particles adsorbed by the anode and drain through the bottom of the equipment. Mouth discharge;


Extraction system

The purified smoke is directly discharged through the chimney

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