WO1994013393B1 - Control of pressurized ozone flow to a pulp delignification reactor - Google Patents
Control of pressurized ozone flow to a pulp delignification reactorInfo
- Publication number
- WO1994013393B1 WO1994013393B1 PCT/US1993/011055 US9311055W WO9413393B1 WO 1994013393 B1 WO1994013393 B1 WO 1994013393B1 US 9311055 W US9311055 W US 9311055W WO 9413393 B1 WO9413393 B1 WO 9413393B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ozone
- compressor
- reactor
- recited
- gas
- Prior art date
Links
- CBENFWSGALASAD-UHFFFAOYSA-N ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 title claims abstract 83
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract 21
- 229920002678 cellulose Polymers 0.000 claims abstract 14
- 239000001913 cellulose Substances 0.000 claims abstract 14
- 239000000498 cooling water Substances 0.000 claims abstract 3
- 239000007789 gas Substances 0.000 claims 24
- 239000012159 carrier gas Substances 0.000 claims 16
- 238000000034 method Methods 0.000 claims 7
- 230000000694 effects Effects 0.000 claims 5
- 239000012530 fluid Substances 0.000 claims 5
- 230000003134 recirculating Effects 0.000 claims 3
- 238000001816 cooling Methods 0.000 claims 2
- 238000000354 decomposition reaction Methods 0.000 claims 2
- 238000004064 recycling Methods 0.000 claims 1
Abstract
A method and apparatus supply ozone containing gas under superatmospheric pressure to an ozone delignification device. The speed of a water ring compressor is controlled so that it compresses as much ozone gas per unit time at desired superatmospheric pressure as the ozone delignification unit utilizes, with essentially no excess. The ozone containing gas is fed from the water ring compressor through a separator buffer tank which levels out pressure pulses and separates cooling water from compressed ozone gas prior to the gas entering the ozone delignification unit. The gas passes through a control valve controlled by a mass flowmeter which senses the amount of cellulose pulp fed to the ozone delignification unit. The speed control of the compressor may be provided by a differential pressure controller connected across the control valve.
Claims
1. A method of supplying ozone in a carrier gas under superatmospheric pressure to effect ozone delignification of cellulose pulp, utilizing a compressor, comprising the steps of:
(a) controlling the speed of operation of the compressor so that it compresses as much ozone per unit time at desired superatmospheric pressure as the ozone delignification process utilizes, with essentially no excess; and
(b) feeding the ozone in carrier gas from the compressor essentially directly to the ozone delignification process.
2. A method as recited in claim 1 wherein step (b) is practiced by the substep (bl) of levelling out the pressure pulses from the compressor.
3. A method as recited in claim 2 wherein the compressor is a water ring compressor, and wherein step (b) is practiced by the further substep (b2) of separating cooling water and compressed ozone gas prior to feeding the ozone gas to the ozone delignification process.
4. A method as recited in claim 3 wherein substeps (bl) and (b2) are practiced by providing a separator buffer tank between the compressor and the ozone delignification process.
5. A method as recited in claim 1 wherein the compressor is a water ring compressor, and wherein step (b) is practiced by the substep of separating cooling water and compressed ozone prior to feeding the ozone to the ozone delignification process. 14
6. A method as recited in claim 5 wherein step (a) is practiced to provide a minimum speed of operation of the water ring compressor which is above the speed necessary to form a ring of water in the compressor.
7. A method as recited in claim 6 further comprising the step of determining if the pressure output from the compressor exceeds a predetermined desired maximum, and in response to such sensing recycling the ozone containing gas to the compressor.
8. A method as recited in claim 5 further utilizing a control valve between the compressor and ozone delignification process, and comprising the further step (c) of controlling the amount of ozone passing through the control valve in response to mass flow sensing of the amount of cellulose pulp being fed to the ozone delignification process.
9. A method as recited in claim 8 wherein step (a) is practiced utilizing a differential pressure controller connected across the control valve to control the speed of the compressor, and to minimize the pressure drop across the control valve.
10. A method as recited in claim 1 wherein the compressor is a water ring compressor, and wherein steps (a) and (b) are practiced to keep the temperature of the compressed ozone and carrier gas substantially at or below ambient temperature by externally cooling the water utilized in the water ring compressor, and recirculating it to the compressor, and wherein the pressure of the compressed ozone containing gas is between 2-20 bar. 15
11. Apparatus for effecting ozone delignification of cellulose pulp, comprising: a source of ozone gas in carrier gas; a reactor for combining ozone in carrier gas, under superatmospheric pressure, with cellulose pulp to effect delignification of the pulp with ozone; a water ring compressor connected between said source and said reactor, for compressing the ozone and carrier gas and supplying the compressed ozone containing gas to said reactor; and speed control means for controlling the speed of said water ring compressor in response to sensing of the need of said reactor for ozone so that said compressor compresses as much ozone per unit time at desired superatmospheric pressure as said reactor utilizes, with essentially no excess.
12. Apparatus as recited in claim 11 further comprising a separator buffer tank disposed between said compressor and reactor, for leveling out pressure pulses from said compressor and separating water from compressed gas, said tank having a minimum volume for performing said leveling out and separating functions so as to minimize ozone decomposition.
13. Apparatus as recited in claim 12 further comprising a control valve disposed between said separator buffer tank and said reactor.
14. Apparatus as recited in claim 13 wherein said speed control means comprises a mass flowmeter for sensing the mass flow of cellulose pulp to said reactor, and means for controlling the amount of gas passing through said control valve in response to said mass flow sensing. 16
15. Apparatus as recited in claim 14 wherein said speed control means further comprises a differential pressure controller operatively connected across said control valve, for measuring the pressure across said control valve, and operatively connected to said water ring compressor.
16. Apparatus as recited in claim 14 wherein said speed control means permits said control valve to operate in a controllable range.
17. Apparatus as recited in claim 14 wherein said source of ozone comprises an ozone generator, and wherein said speed control means permits said ozone generator to operate at an optimum pressure.
18. Apparatus as recited in claim 15 wherein said speed control means further comprises means for maintaining a minimum speed of said compressor above the speed required to insure that a ring of water forms in said compressor at all times.
19. Apparatus as recited in claim 18 further comprising a gas line extending from between said separator buffer tank and said control valve back to between said ozone gas source and said water ring compressor, and a back pressure regulator means disposed in said gas line for insuring that the compressor output pressure does not exceed a level which could damage said reactor, control valve, or other apparatus components.
20. Apparatus as recited in claim 15 further comprising a heat exchanger, and a water recirculating line, said water recirculating line extending from a bottom portion of said separator buffer tank to said heat 17
exchanger, and to a point between said ozone source and said water ring compressor; and means for circulating cooling fluid into said heat exchanger to cool the water passing therethrough.
21. Apparatus as recited in claim 15 further comprising a check valve disposed between said control valve and said reactor to prevent the flow of fluid from said reactor to said compressor.
22. Apparatus as recited in claim 21 further comprising a check valve between said ozone source and said water ring compressor to prevent fluid from passing from said compressor said ozone source.
23. Apparatus as recited in claim 14 further comprising an ozone concentration sensor for monitoring the amount of ozone passing to said reactor so that this concentration may be combined with the volume flow to determine the amount of ozone charged.
24. Apparatus for effecting ozone delignification of cellulose pulp, comprising: a source of ozone gas in carrier gas; a reactor for combining ozone in carrier gas, under superatmospheric pressure, with cellulose pulp to effect delignification of the pulp with ozone; a compressor connected between said source and said reactor, for compressing the ozone and carrier gas and supplying the compressed ozone containing gas to said reactor; speed control means for controlling the speed of said compressor in response to sensing of the need of said reactor for ozone so that said 18
compressor compresses as much ozone per unit time at desired superatmospheric pressure as the reactor utilizes, with essentially no excess; and a separator buffer tank disposed between said compressor and reactor, for leveling out pressure pulses from said compressor and separating water from compressed gas, said tank having a mimmum volume for performing said leveling out and separating functions so as to minimize ozone decomposition.
25. Apparatus for effecting ozone delignification of cellulose pulp, comprising: a source of ozone gas in carrier gas; a reactor for combining ozone in carrier gas, under superatmospheric pressure, with cellulose pulp to effect delignification of the pulp with ozone; a compressor connected between said source and said reactor, for compressing the ozone and carrier gas and supplying the compressed ozone containing gas to said reactor; speed control means for controlling the speed of said compressor in response to sensing of the need of said reactor for ozone so that said compressor compresses as much ozone per unit time at desired superatmospheric pressure as the reactor utilizes, with essentially no excess; a control valve for controlling the amount of gas passing from said compressor to said reactor; and wherein said speed control means comprises a mass flowmeter for sensing the mass flow of cellulose pulp to said reactor, and means for controlling said control valve in response to said mass flow sensing. 19
26. Apparatus for effecting ozone delignification of cellulose pulp, comprising: a source of ozone gas in carrier gas; a reactor for combining ozone in carrier gas, under superatmospheric pressure, with cellulose pulp to effect delignification of the pulp with ozone; a compressor connected between said source and said reactor, for compressing the ozone and carrier gas and supplying the compressed ozone containing gas to said reactor; speed control means for controlling the speed of said compressor in response to sensing of the need of said reactor for ozone so that said compressor compresses as much ozone per unit time at desired superatmospheric pressure as the reactor utilizes, with essentially no excess; a control valve for controlling the amount of gas passing from said compressor to said reactor; wherein said speed control means comprises a mass flowmeter for sensing the mass flow of cellulose pulp to said reactor, and means for controlling said control valve in response to said mass flow sensing; and wherein said speed control means comprises a differential pressure controller operatively connected across said control valve, for measuring the pressure across the control valve, and operatively connected to said compressor.
27. Apparatus as recited in claim 24 wherein said source of ozone gas and carrier gas comprises an ozone generator; and wherein said speed control means permits said control valve to operate in a controllable range, and wherein said speed control means permits said ozone generator to operate at an optimum pressure. 20
28. Apparatus as recited in claim 24 further comprising a gas line extending from between said separator buffer tank and said control valve back to between said ozone gas source and said compressor, and a back pressure regulator means disposed in said gas line for insuring that the compressor output pressure does not exceed a level which could damage said reactor, control valve, or other apparatus components.
29. Apparatus as recited in claim 24 further comprising a check valve disposed between said control valve and said reactor to prevent the flow of fluid from said reactor to said compressor.
30. Apparatus as recited in claim 24 further comprising a check valve between said ozone source and said compressor to prevent fluid from passing from said compressor to said ozone source.
31. Apparatus as recited in claim 24 further comprising an ozone concentration sensor for monitoring the amount of ozone passing to said reactor so that this concentration may be combined with the volume flow to determine the amount of ozone charged.
32. Apparatus as recited in claim 25 wherein said speed control means further comprises a differential pressure controller operatively connected across said control valve, for measuring the pressure across said control valve, and operatively connected to said compressor.
33. Apparatus as recited in claim 32 further comprising an zone concentration sensor for monitoring the amount of ozone passing to said 21
reactor so that this concentration may be combined with the volume flow to determine the amount of ozone charged.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP94902254A EP0671972A1 (en) | 1992-12-07 | 1993-11-16 | Control of pressurized ozone flow to a pulp delignification reactor |
| JP6514175A JPH08504486A (en) | 1992-12-07 | 1993-11-16 | Method and apparatus for controlling pressurized ozone flow introduced into pulp delignification reactor |
| FI952800A FI952800A0 (en) | 1992-12-07 | 1995-06-07 | Methods and devices for controlling the pressurized feed of the eyes into a delignification reactor |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/989,932 US5364505A (en) | 1992-12-07 | 1992-12-07 | Pressurized ozone pulp delignification reactor and a compressor for supplying ozone to the reactor |
| US989,932 | 1992-12-07 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO1994013393A1 WO1994013393A1 (en) | 1994-06-23 |
| WO1994013393B1 true WO1994013393B1 (en) | 1994-08-04 |
Family
ID=25535591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1993/011055 WO1994013393A1 (en) | 1992-12-07 | 1993-11-16 | Control of pressurized ozone flow to a pulp delignification reactor |
Country Status (6)
| Country | Link |
|---|---|
| US (2) | US5364505A (en) |
| EP (1) | EP0671972A1 (en) |
| JP (1) | JPH08504486A (en) |
| CA (1) | CA2149404A1 (en) |
| FI (1) | FI952800A0 (en) |
| WO (1) | WO1994013393A1 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6007680A (en) * | 1994-12-08 | 1999-12-28 | Kvaerner Pulping Ab | Apparatus for safely conducting pressurized peroxide bleaching |
| SE506809C2 (en) * | 1994-12-08 | 1998-02-16 | Kvaerner Pulping Tech | Method for safely operating pressurized peroxide bleaching |
| US5954066A (en) * | 1995-01-25 | 1999-09-21 | Kvaerner Pulping Ab | Method for controlling chemical reaction |
| CH689391A5 (en) * | 1995-04-26 | 1999-03-31 | Ozonia Int Sa | A method of generating an ozone-containing process gas. |
| JP4101314B2 (en) * | 1996-03-01 | 2008-06-18 | 三菱電機株式会社 | Power conversion storage method and apparatus |
| AU3196897A (en) * | 1997-04-30 | 1998-11-24 | Kvaerner Pulping Ab | Outlet arrangement in a pressure vessel for the bleaching of pulp |
| US5904170A (en) * | 1997-05-14 | 1999-05-18 | Applied Materials, Inc. | Pressure flow and concentration control of oxygen/ozone gas mixtures |
| US6174409B1 (en) | 1997-09-19 | 2001-01-16 | American Air Liquide Inc. | Method to improve final bleached pulp strength properties by adjusting the CI02:03 ration within a single (D/Z) stage of the bleaching process |
| DE10158449C1 (en) * | 2001-11-30 | 2003-12-24 | Wedeco Umwelttechnologie Gmbh | Method and device for compressing ozone-containing gas for ozone pulp bleaching |
| JP4954995B2 (en) * | 2005-07-07 | 2012-06-20 | エム ケー エス インストルメンツ インコーポレーテッド | Ozone system for multi-chamber tools |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3549528A (en) * | 1964-04-23 | 1970-12-22 | Edward T Armstrong | Ozone sterilization process |
| DE2556328C2 (en) * | 1975-12-13 | 1982-06-03 | Hoechst Ag | Water treatment method |
| NO142091C (en) * | 1977-10-17 | 1980-06-25 | Myrens Verksted As | PROCEDURE FOR OZONE TREATMENT OF REFINO MECHANICAL AND THERMOMECHANICAL MASS. |
| US4978508A (en) * | 1988-09-01 | 1990-12-18 | Pacific Resource Recovery Corp. | Method and apparatus for soil decontamination |
| US4902381A (en) * | 1988-12-09 | 1990-02-20 | Kamyr, Inc. | Method of bleaching pulp with ozone-chlorine mixtures |
| FI89516B (en) * | 1989-05-10 | 1993-06-30 | Ahlstroem Oy | Foerfarande Foer blekning av cellulosamassa med Otson |
| AU636173B2 (en) * | 1989-10-30 | 1993-04-22 | Lenzing Aktiengesellschaft | Method for the chlorine-free bleaching of pulps |
| AT393701B (en) * | 1989-12-22 | 1991-12-10 | Schmidding Wilh Gmbh & Co | METHOD FOR BLEACHING CELLULOSE-CONTAINING MATERIALS, AND SYSTEM FOR CARRYING OUT THE METHOD |
| US5411633A (en) * | 1991-04-30 | 1995-05-02 | Kamyr, Inc. | Medium consistency pulp ozone bleaching |
| AT395445B (en) * | 1991-05-02 | 1992-12-28 | Voest Alpine Ind Anlagen | METHOD FOR BLEACHING CELLULOSE-CONTAINING MATERIAL |
| JPH05132884A (en) * | 1991-11-08 | 1993-05-28 | Sumitomo Precision Prod Co Ltd | Method for pressurizing ozone-containing gas |
| US5382326A (en) * | 1992-04-17 | 1995-01-17 | Kamyr, Inc. | Ozone mixing test apparatus |
| US5403441A (en) * | 1992-11-13 | 1995-04-04 | Union Camp Patent Holding, Inc. | Method for controlling an ozone bleaching process |
-
1992
- 1992-12-07 US US07/989,932 patent/US5364505A/en not_active Expired - Fee Related
-
1993
- 1993-11-16 WO PCT/US1993/011055 patent/WO1994013393A1/en not_active Application Discontinuation
- 1993-11-16 EP EP94902254A patent/EP0671972A1/en not_active Withdrawn
- 1993-11-16 JP JP6514175A patent/JPH08504486A/en active Pending
- 1993-11-16 CA CA002149404A patent/CA2149404A1/en not_active Abandoned
-
1994
- 1994-07-15 US US08/275,392 patent/US5567274A/en not_active Expired - Fee Related
-
1995
- 1995-06-07 FI FI952800A patent/FI952800A0/en unknown
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