TH70166A - The purifier's steam separation system for reducing dryer emissions. - Google Patents

Abstract

DC60 (16/08/47) The purifier's steam separation system corresponding to this invention includes a blow path for the Conveying mixtures of fibrous materials from The scrubber goes to the inlet of the steam extractor. Water vapor received It is discharged from the extractor through the steam outlet. Cleaned fibrous material Then get released from The separator passes through the outlet, which prevents most of the effluent flow through the outlet. Relay pipes contact with outlet and pipe. Drier, and conveys purified fibrous material in between. The resin inlet contacts the relay tube, and the resin is fed inside. The resin has been mixed with Purified fibrous material Previous line material Impregnated fiber Then clean will be dried in the pipe. Drier The invention also focuses on methods for reducing VOC emissions generated during the purification of cellulose fiber materials. Conveying mixtures of fibrous materials from The scrubber goes to the inlet of the steam extractor. Water vapor received It is discharged from the extractor through the steam outlet. Cleaned fibrous material Then get released from The separator passes through the outlet, which prevents most of the effluent flow through the outlet. Relay pipe contact with outlet and pipe Drier, and conveys purified fibrous material in between. The resin inlet contacts the relay tube, and the resin is fed inside. The resin has been mixed with Purified fibrous material Previous line material Impregnated fiber Then clean will be dried in the pipe. Drier The invention is also aimed at reducing the VOC emissions generated during the purification of cellulose fiber materials.

Claims (34)

1. The vapor separation system of the purifier consists of: a blowing path for conveying the mixture of fibrous material and vapor; a vapor separator with an inlet connected to the blowing path for receiving the mixture, a vapor outlet for releasing waste vapor, and an outlet for releasing the cleaned fibrous material from the separator and for preventing most of the waste vapor from flowing through; a drying pipe arranged in conjunction with the dryer for drying the cleaned fibrous material; a relay pipe connected to the aforementioned outlet and the dryer pipe for conveying the cleaned fibrous material from the outlet to the dryer pipe; and a resin inlet connected to the relay pipe for supplying resin, which is mixed with the cleaned fibrous material before the cleaned fibrous material enters the dryer pipe. 2. The system of claim 1, where the said vapor separator is a non-pressurized vapor separator. 3. The system of claim 2, which further comprises a rotary air lock in contact with the aforementioned outlet and the aforementioned relay pipe, such air lock prevents the majority of the exhaust vapor from passing into the aforementioned relay pipe. 4. The system of claim 3, which further comprises a high-pressure blower arranged in conjunction with the aforementioned relay piping for supplying air to the drying piping. 5. The system of claim 4, which further includes a venturi system arranged in conjunction with the aforementioned relay pipe and dryer for conveying the cleaned fibrous material from the outlet to the drying pipe. 6. A system under claim number 4, where such blower supplies air at a pressure of approximately 15 pounds per square inch or less. 7. The system of claim number 4, whereby such blower supplies hot air at a temperature of at least approximately 200° Fahrenheit. 8. The system of claim 4, where such blower is specified to be of sufficient size to cause the cleaned fibrous material to flow through such relay pipe at a speed of at least approximately 100 feet per second. 9. The system of claim 3, which further includes a venturi system arranged in conjunction with the aforementioned relay pipes for conveying the cleaned fibrous material to the drying pipes. 10. The system of claim 3, which includes a steam nozzle connected to the relay tube on the upstream side of the drying tube, for accelerating the passage of the cleaned fibrous material through the relay tube. 11. The system of claim 10, where the said resin feed path contacts the said relay pipe at the point between the said steam nozzle and the said dryer pipe. 12. The system of claim 1, in which the said steam separator is selected from a group consisting of non-compressible cyclones, compressed cyclones, and compressed mechanical steam separators. 13. The system of claim 12, which includes a screw feeder connected to the aforementioned outlet and the aforementioned relay pipe, the screw feeder for the purpose of preventing the majority of the waste steam from passing into the aforementioned relay pipe. 14. The system of claim 13, which includes a steam nozzle connected to the relay pipe on the upstream side of the said outlet, and for supplying clean steam to the said relay pipe for conveying the cleaned fibers through the said relay pipe to the said drying pipe. 15. A system under claim 14, where the pressure inside the pipe of such a relay is sufficient to achieve a minimum flow velocity of approximately 100 feet per second. 16. The system of claim 15, where the temperature inside the tube of such relay is at least approximately 212 °F. 17. The system of claim 14, where the said resin feed path contacts the said relay pipe at a distance from the said dryer pipe which is sufficient to allow adequate mixing of the resin and the cleaned fibrous material before drying. 18. The system of claim 1, where the said resin feed path includes a pressurized nozzle for atomizing the resin into the said relay pipe. 19. The system of claim 1, where the said resin feed path supplies phenol-formaldehyde-based resin into the said relay pipe. 20. The system of claim 1, where the relay tube includes an approximately 90° elbow at the end, feeds the resin into the path for flow turbulence creation. 21. A system of claim 1, where the flow velocity within such a blowing path is largely equal to the flow velocity of such a relay pipe. 22. The system of claim 1, which includes a cleaning system integrated into the operation of the aforementioned exhaust steam outlet for exhaust steam cleaning. 23. The system of claim 22, in which the said cleaning system is selected from a group consisting of a scrubber, incinerator, and condenser. 24. The system of claim 1, which includes a thermomechanical purifier arranged in conjunction with the aforementioned blowing path, the blowing path conveys the mixture from the thermomechanical purifier to the aforementioned inlet. 25. The vapor separation system of the purifier consists of: a blowing path for conveying the mixture of fibrous material and vapor; a first vapor separator with a first inlet connected to the aforementioned blowing path for receiving the mixture, a first outlet for waste vapor discharge, and a first outlet for discharge of partially cleaned fibrous material from the separator and for preventing the first portion of waste vapor from flowing through; a vapor separator with a second inlet, a second outlet for waste vapor discharge, and a second outlet for discharge of cleaned fibrous material from the separator and for preventing the majority of waste vapor from flowing through; a drying pipe arranged in conjunction with the dryer for drying the cleaned fibrous material; a first relay pipe connected to the aforementioned first and second outlets for conveying partially cleaned fibrous material between them; a second relay pipe connected to the aforementioned outlets and the aforementioned drying pipe for conveying cleaned fibrous material between them; and a resin inlet connected to the aforementioned second relay pipe for supplying resin inside. The resin is mixed with the cleaned fibrous material before the cleaned fibrous material enters the drying tube. 26. The system of claim 25, in which the first and second aforementioned steam separators are selected from a group comprising non-pressurized cyclones, pressurized cyclones, and pressurized mechanical steam separators. 27. The system of claim 26, which includes the first screw feeder arranged in conjunction with the aforementioned first outlet and the aforementioned first relay pipe, the first screw feeder allows the partially cleaned fibrous material to flow through the aforementioned first outlet into the aforementioned first relay pipe and prevents a portion of the waste vapor from flowing through. 28. The system of claim 27, which is further comprised of a second screw feeder arranged in conjunction with the aforementioned second outlet and the aforementioned second relay pipe, the second screw feeder allows the cleaned fibrous material to flow through the aforementioned second outlet into the aforementioned second relay pipe and prevents a portion of the wastewater from flowing through. 29. A system of claims 25, where the flow velocity within the second relay pipe is largely equal to the flow velocity within the blowing path. 30. The system of claim 25, where the said resin feed path contacts the said relay pipe at a distance from the said dryer pipe sufficient to allow adequate mixing of the resin and the cleaned fibrous material prior to drying. 31. The method for reducing the release of volatile organic compounds (VOCs) generated during the bleaching of cellulose fibers consists of the following steps: conveying the mixture of fibers and process steam containing VOCs in a blowing path at a first flow velocity into the steam separator; discharging the cleaned fibers from the separator into the relay pipe, while preventing a large portion of the process steam from entering the relay pipe; conveying the cleaned fibers through the relay pipe at a second flow velocity while mixing the cleaned fibers with a low-VOC resin; and drying the mixed cleaned fibers and resin in a drying pipe. 32. The method of claim 31, where the first flow velocity is largely equal to the second flow velocity. 33. The method of claim 31, which includes the preparation of phenol-formaldehyde resins during the conveying and mixing process. 34. The method of claim 31, which includes the following steps, is to maintain the pressure inside the relay pipe at a value sufficient to achieve a flow velocity of at least approximately 100 feet per second.