Claims
- 1. A method of minimizing the release of malodorous TRS-containing gases from a comminuted cellulosic fibrous material feed system, said method comprising:(a) providing comminuted cellulosic fibrous material at a first pressure in the feed system and ultimately discharging the comminuted cellulosic material from the feed system; (b) discharging malodorous gases from the feed system at a gas discharge point, substantially independently of the discharge of comminuted cellulosic fibrous material therefrom; (c) pressurizing at least some of the malodorous gas discharged in (b) to increase the pressure thereof; and (d) re-introducing the pressurized gas from (c) into the flow of comminuted cellulosic material downstream of the gas discharge point.
- 2. A method as recited in claim 1 further comprising a treatment vessel downstream of the feed system; and wherein (d) is practiced by re-introducing the malodorous gases into the treatment vessel.
- 3. A method as recited in claim 2 wherein (c) is practiced to increase the pressure of the gases to between about 11-31 psig, and at least one psig higher than the pressure in the treatment vessel.
- 4. A method as recited in claim 1 wherein (c) is practiced using a thermocompressor, and introducing low pressure steam into the thermocompressor.
- 5. A method as recited in claim 4 further comprising a treatment vessel downstream of the feed system; and wherein (c) is practiced to increase the pressure of the gases to between about 11-31 psig, and at least one psig higher than the pressure in the treatment vessel.
- 6. A method as recited in claim 1 wherein (d) is practiced to reintroduce pressurized gas into the feed system, and (c) is practiced to increase the pressure by at least 2 psig.
- 7. A method as recited in claim 1 wherein (d) is practiced by discharging the material into a horizontal steaming vessel in the feed system.
- 8. A method as recited in claim 7 further comprising (e) steaming the material in the horizontal steaming vessel, and discharging steamed material from the horizontal steaming vessel from a bottom portion thereof; remote from the pressure isolation device; and (f) discharging malodorous gases from a top portion of the horizontal steaming vessel adjacent the bottom portion thereof from which the material is discharged; and (g) treating or disposing of the gases from (f) in an non-condensable gas system.
- 9. A method as recited in claim 1 further comprising a treatment vessel downstream of the feed system; and wherein (c) is practiced to increase the pressure of the gases to between about 11-31 psig, and at least one psig higher than the pressure in the treatment vessel.
- 10. A method of minimizing the release of malodorous TRS-containing gases from a comminuted cellulosic fibrous material feed system having a pressure isolation device with an inlet and outlet, and a treatment vessel connected to the outlet, said method comprising:(a) introducing comminuted cellulosic fibrous material at a first pressure to the inlet of the pressure isolation device; (b) transferring the material to the outlet of the pressure isolation device at a second pressure, higher than the first pressure; (c) discharging the material from the pressure isolation device to the treatment vessel; (d) discharging malodorous gases from the pressure isolation device substantially independently of the discharge of comminuted cellulosic fibrous material therethrough; (e) pressurizing at least some of the malodorous gases discharged in (d) to increase the pressure thereof; and (f) re-introducing the pressurized malodorous gases into the flow of comminuted cellulosic material downstream of the pressure isolation device.
- 11. A method as recited in claim 10 wherein (f) is practiced by re-introducing the malodorous gases into the treatment vessel connected to the outlet of the pressure isolation device.
- 12. A method as recited in claim 10 wherein (e) is practiced using a thermocompressor or an eductor, and introducing steam into the thermocompressor or eductor.
- 13. A method as recited in claim 12 wherein (c) is practiced by discharging the material into a horizontal steaming vessel and wherein (f) is practiced by re-introducing the malodorous gases into the horizontal steaming vessel.
- 14. A method as recited in claim 13 further comprising (g) steaming the material in the horizontal steaming vessel, and discharging steamed material from the horizontal steaming vessel from a bottom portion thereof remote from the pressure isolation device; (h) discharging malodorous gases from a top portion of the horizontal steaming vessel adjacent the bottom portion thereof from which the material is discharged; and (i) treating or disposing of the gases from (h) in an non-condensable gas system.
- 15. A method as recited in claim 10 further comprising screening the gases passing out of the pressure isolation device during (d) to substantially prevent the passage of chips, pins, or fines out of the pressure isolation device with the malodorous gases.
- 16. A method of minimizing the release of malodorous TRS-containing gases from a comminuted cellulosic fibrous material feed system having a star-type feeder with an inlet and outlet, said method comprising:(a) introducing comminuted cellulosic fibrous material at a first pressure to the inlet of the star-type feeder; (b) rotating the star-type feeder, so as to transfer the material to the outlet of the star-type feeder at a second pressure, higher than the first pressure; (c) discharging the material from the star-type feeder outlet; (d) discharging malodorous gases from the star-type feeder substantially independently of the discharge of comminuted cellulosic fibrous material therefrom; (e) pressurizing substantially all of the malodorous gases discharged in (d) to increase the pressure thereof; and (f) introducing the pressurized malodorous gases from (e) into the flow of comminuted cellulosic material downstream of the star-type feeder.
- 17. A method as recited in claim 16 wherein (c) is practiced by discharging the material from the star-type feeder outlet to a treatment vessel operatively connected to the outlet, and wherein (f) is practiced by introducing the malodorous gases into the treatment vessel.
- 18. A method as recited in claim 16 wherein (e) is practiced using a thermocompressor or an eductor, and introducing steam into the thermocompressor or eductor.
- 19. A method as recited in claim 16 further comprising screening the gases passing out of the star-type feeder during (d) to substantially prevent the passage of chips, pins, or fines out of the pressure isolation device with the malodorous gases.
- 20. A method of minimizing the release of malodorous TRS-containing gases from a comminuted cellulosic fibrous material feed system, said method comprising:(a) providing comminuted cellulosic fibrous material at a first pressure in the feed system and ultimately discharging the comminuted cellulosic material from the feed system; (b) discharging malodorous gases from the feed system at a gas discharge point, substantially independently of the discharge of comminuted cellulosic fibrous material therefrom; (c) pressurizing substantially of the malodorous gas discharged in (b) to increase the pressure thereof by at least 2 psig and to between about 11-31 psig; and (d) re-introducing the pressurized gas from (c) into the flow of comminuted cellulosic material downstream of the gas discharge point.
- 21. A method as recited in claim 20 wherein (d) is practiced by discharging the material into a horizontal steaming vessel and feed system; and further comprising (e) steaming the material in the horizontal steaming vessel, and discharging steamed material from the horizontal steaming vessel from a bottom portion thereof; remote from the pressure isolation device; and (f) discharging malodorous gases from a top portion of the horizontal steaming vessel adjacent the bottom portion thereof from which the material is discharged; and (g) treating or disposing of the gases from (f) in a non-condensable gas system.
- 22. A method as recited in claim 20 wherein (c) is practiced using a thermocompressor, and introducing low pressure steam into the thermocompressor; and further comprising screening the gases passing out of the pressure isolation device during (b) to substantially prevent the passage of chips, pins, or fines out of the pressure isolation device with the malodorous gases.
CROSS-REFERENCE TO RELATED APPLICATION
This application claims the priority of provisional application Ser. No. 60/118,697 filed Feb. 4, 1999.
US Referenced Citations (14)
Non-Patent Literature Citations (2)
Entry |
“Thermocompressors”, from www.foxvalve.com, 1999.* |
Northeast Inc. online “Venturi Products”, www.nciweb.net, 1999. |
Provisional Applications (1)
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Number |
Date |
Country |
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60/118697 |
Feb 1999 |
US |