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Theoretical approach for enhanced mass transfer effects in-duct flue gas desulfurization processes
Removal of sulfur dioxide (SO{sub 2}) from the flue gas of coal- burning power plants can be achieved by duct spray drying using calcium hydroxide (Ca(OH){sub 2}) slurries. A primary objective of this research was to discover the aspects of mass transfer into Ca(OH){sub 2} slurries which limit SO{sub 2} absorption. A bench- scale stirred tank reactor with a flat gas/liquid interface was used to simulate SO{sub 2} absorption in a slurry droplet. The absorption rate of SO{sub 2} from gas concentrations of 500 to 5000 ppm was measured at 55{degrees}C in clear solutions and slurries of Ca(OH){sub 2} up to 1.0 M (7 wt percent). Results are reported in terms of the enhancement factor, {O}. This research will allow prediction of conditions where the absorption of SO{sub 2} in Ca(OH){sub 2} slurries can be enhanced by changes to liquid phase constituents (under which SO{sub 2} absorption is controlled by liquid film mass transfer). Experiments in the stirred tank have shown that SO{sub 2} absorption in a 1.0 M Ca(OH){sub 2} slurry was completely dominated by gas film mass transfer with a large excess of Ca(OH){sub 2} but becomes controlled by liquid film resistance at greater than 50 percent Ca(OH){sub …
Date:
January 29, 1992
Creator:
Jozewicz, W. (Acurex Corp., Research Triangle Park, NC (United States). Environmental Systems Div.) & Rochelle, G.T. (Texas Univ., Austin, TX (United States). Dept. of Chemical Engineering)
Object Type:
Report
System:
The UNT Digital Library
Theoretical approach for enhanced mass transfer effects in-duct flue gas desulfurization processes
This report presents the results of fundamental mass transfer testing for in-duct removal of SO{sub 2}. Following this initial part of an experimental program, it became clear that the amount of initial moisture on the sorbent strongly affected the extent of Ca(OH){sub 2} conversion. Novel techniques aimed at increasing sorbent utilization were investigated and are described. Major novel technique investigated and reported on here was the reaction with SO{sub 2} of sorbents with initial free moisture (damp sorbents). The duct injection process using damp solids has the following steps: preparation of sorbent as a slurry, blending of the slurry with dry recycle materials to create damp solids, injection of the solids into the duct, reaction and drying of the solids with flue gas in the duct, collection in particulate control equipment, and finally recycle of dry solids with some bleed to disposal. The moisture content of the solids at each step affects system performance. Various factors favor high moisture whereas others favor low moisture. (VC)
Date:
January 29, 1992
Creator:
Jozewicz, W. (Acurex Corp., Research Triangle Park, NC (United States). Environmental Systems Div.) & Rochelle, G.T. (Texas Univ., Austin, TX (United States). Dept. of Chemical Engineering)
Object Type:
Report
System:
The UNT Digital Library
[Press release: Response to Ross Perot comments on gays in military, government]
Press release of a statement from the executive director of NGLTF responding to Perot's offensive comments about gays and lesbians working in the government and military.
Date:
May 29, 1992
Creator:
National Gay and Lesbian Task Force (U.S.)
Object Type:
Text
System:
The UNT Digital Library
The Tulia Herald (Tulia, Tex.), Vol. 84, No. 44, Ed. 1 Thursday, October 29, 1992
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
October 29, 1992
Creator:
Reynolds, Jim
Object Type:
Newspaper
System:
The Portal to Texas History
Bogata News (Bogata, Tex.), Vol. 81, No. 50, Ed. 1 Thursday, October 29, 1992
Weekly newspaper from Bogata, Texas that includes local, state, and national news along with advertising.
Date:
October 29, 1992
Creator:
Nichols, Nanalee & Nichols, Thomas
Object Type:
Newspaper
System:
The Portal to Texas History
Control of triacylglycerol biosynthesis in plants
Title list.
Date:
January 29, 1992
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Corrosion fatigue of iron-chromium-nickel alloys: Fracture mechanics, microstructure and chemistry
This progress report briefly summarizes the research performed under the referenced grant for the period from 1 December 1990 to 31 December 1991, and contains a cumulative listing of technical presentations and publications dating back to 1 June 1988. Under this grant, a multi-disciplinary research program is undertaken to address certain fundamental issues relating to corrosion fatigue crack growth in structurally important alloys in aqueous environments. The principal goal of the research is to develop and expand the scientific understanding of the processes that control corrosion fatigue crack growth, particularly for ferrous alloys in terms of the controlling mechanical and chemical/electrochemical processes and their interactions with the microstructure. Focus is placed upon the austenitic iron-chromium-nickel (FeCrNi) alloys because of the need to resolve certain mechanistic issues and because of extensive utilization of these alloys in the power generation and chemical industries. Emphasis is given to the growth of short (small) cracks at low growth rates because crack growth in this regime is expected to be more sensitive to changes in external chemical/electrochemical variables.
Date:
January 29, 1992
Creator:
Wei, Robert P.
Object Type:
Report
System:
The UNT Digital Library
Uniformity of material in the SME and MFT
The DWPF will satisfy the product consistency specification in the Waste Acceptance Preliminary Specifications through control of the chemical composition of the glass product. This control will be achieved by ensuring that each batch of feed in the Slurry Mix Evaporator (SME) will produce glass which satisfies the specification. The purpose of this report is to determine what degree of uniformity can be expected of material in the SME and Metter Feed Tank (MFT). These vessels were designed based on a design development process which had proven successful for similar hard-to-mix feeds in the past. This process resulted in a design of the SME and MFT agitation systems which was intended to provide highly uniform melter feed material. Based on the results of extensive tests in protoypic equipment, the SME and MFT designs have met this design goal.
Date:
May 29, 1992
Creator:
Plodinec, M.J.
Object Type:
Report
System:
The UNT Digital Library
Organic evaporator steam valve failure
Defense Waste Processing Facility (DWPF) Technical has requested an analysis of the capacity of the Organic Evaporator (OE) condenser (OEC) be performed to determine its capability in the case where the OE steam flow control valve fails open. Calculations of the OE boilup and the OEC heat transfer coefficient indicate the OEC will have more than enough capacity to remove the heat at maximum OE boilup. In fact, the Salt Cell Vent Condenser (SCVC) should also have sufficient capacity to handle the maximum OE boilup. Therefore, it would require simultaneous loss of OEC and/or SCVC condensing capacity for the steam valve failure to cause high benzene in the Process Vessel Vent System (PVVS).
Date:
September 29, 1992
Creator:
Jacobs, R.A.
Object Type:
Report
System:
The UNT Digital Library
Organic Evaporator steam valve failure
DWPF Technical has requested an analysis of the capacity of the organic Evaporator (OE) condenser (OEC) be performed to determine its capability in the case where the OE steam flow control valve fails open. Calculations of the OE boilup and the OEC heat transfer coefficient indicate the OEC will have more than enough capacity to remove the heat at maximum OE boilup. In fact, the Salt Cell Vent Condenser (SCVC) should also have sufficient capacity to handle the maximum OE boilup. Therefore it would require simultaneous loss of OEC and/or SCVC condensing capacity for the steam valve failure to cause high benzene in the Process Vessel Vent System (PVVS).
Date:
September 29, 1992
Creator:
Jacobs, R. A.
Object Type:
Report
System:
The UNT Digital Library
Integrated dry NO[sub x]/SO[sub 2] emissions control system
This Quarterly Report summarizes the Integrated Dry NO[sub x]/SO[sub 2] Emissions Control System Project (DOE Agreement No. DE-FC22-91PC90550) progress for the months of April, May, and June 1992. Public Service Company of Colorado ( PSCC'') activities focused on construction of all systems for the project. The unit was off-line for installation of the project equipment from March 20, 1992 through May 30, 1992. A short summary of the items completed are listed. Construction activities centered on boiler modifications to install the new burners and the overfire air system. A major milestone was achieved when the boiler was successfully hydrotested on April 18, 1992. Gas burners were fired on May 27, 1992 and the unit was operating on coal May 30, 1992 at 5OMWe. Startup went was very smooth. with only minor modifications required. Significant progress was made on construction of the dry sorbent injection system this quarter. All equipment has been set and most piping is complete. All work on the humidification system, other than painting and insulation, was completed.
Date:
September 29, 1992
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
[Denton Record-Chronicle article, January 29, 1992]
A column written by Henry Martinez for the Denton Record-Chronicle covering two students, Brooke D. Blocker and Jeffrey M. McGuirk, who are finalists in the Coca-Cola Scholars Program which provides a renewable scholarship to up to 150 students. Martinez also covers Sharon Warwick's featured speaking event at the Dallas Museum of Art.
Date:
January 29, 1992
Creator:
Martinez, Henry
Object Type:
Clipping
System:
The UNT Digital Library
Cherokeean/Herald (Rusk, Tex.), Vol. 144, No. 39, Ed. 1 Thursday, October 29, 1992
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
October 29, 1992
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Texas Register, Volume 17, Number 40, Pages 3869-3929, May 29, 1992
A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date:
May 29, 1992
Creator:
Texas. Secretary of State.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Texas Register, Volume 17, Number 74, Pages 6659-6695, September 29, 1992
A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date:
September 29, 1992
Creator:
Texas. Secretary of State.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Texas Attorney General Opinion: DM-172
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Dan Morales, regarding a legal question submitted for clarification: Whether a petition calling for a county election to adopt the Optional County Road System that contains provisions not authorized under V.T.C.S. article 6702-1, chapter 3, subchapter C, invalidates the petition (RQ-80)
Date:
September 29, 1992
Creator:
Texas. Attorney-General's Office.
Object Type:
Text
System:
The Portal to Texas History
Texas Attorney General Opinion: DM-173
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Dan Morales, regarding a legal question submitted for clarification: Whether the Human Resource Code section 101.063 provides immunity to volunteer ombudsman in the Texas Department of Aging long-term care ombudsman program (RQ-87)
Date:
September 29, 1992
Creator:
Texas. Attorney-General's Office.
Object Type:
Text
System:
The Portal to Texas History
Investigation of cold nuclear fusion in condensed matter. Final report
Recent research has been directed towards finding means to produce neutron emissions at will, to demonstrate reproducibility, and to permit in-depth studies of the origin of neutron emissions. this goal has been pursued in the Kamiokande detector in Japan and has led to the development of a deep underground laboratory in a tunnel in the Wasatch mountains near Brigham Young University. New counters for low-level neutron emissions are being utilized. Calorimetric tools have also been developed.
Date:
December 29, 1992
Creator:
Jones, S. E.; Berrondo, M.; Czirr, J. B.; Decker, D. L.; Harrison, K.; Jensen, G. L. et al.
Object Type:
Report
System:
The UNT Digital Library
Corrosion fatigue of iron-chromium-nickel alloys: Fracture mechanics, microstructure and chemistry. Progress report, December 1, 1990--December 31, 1992
This progress report briefly summarizes the research performed under the referenced grant for the period from 1 December 1990 to 31 December 1991, and contains a cumulative listing of technical presentations and publications dating back to 1 June 1988. Under this grant, a multi-disciplinary research program is undertaken to address certain fundamental issues relating to corrosion fatigue crack growth in structurally important alloys in aqueous environments. The principal goal of the research is to develop and expand the scientific understanding of the processes that control corrosion fatigue crack growth, particularly for ferrous alloys in terms of the controlling mechanical and chemical/electrochemical processes and their interactions with the microstructure. Focus is placed upon the austenitic iron-chromium-nickel (FeCrNi) alloys because of the need to resolve certain mechanistic issues and because of extensive utilization of these alloys in the power generation and chemical industries. Emphasis is given to the growth of short (small) cracks at low growth rates because crack growth in this regime is expected to be more sensitive to changes in external chemical/electrochemical variables.
Date:
January 29, 1992
Creator:
Wei, R. P.
Object Type:
Report
System:
The UNT Digital Library
Control of triacylglycerol biosynthesis in plants. Technical progress report, [June 1, 1991--May 31, 1992]
Title list.
Date:
January 29, 1992
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Organic Evaporator steam valve failure
DWPF Technical has requested an analysis of the capacity of the organic Evaporator (OE) condenser (OEC) be performed to determine its capability in the case where the OE steam flow control valve fails open. Calculations of the OE boilup and the OEC heat transfer coefficient indicate the OEC will have more than enough capacity to remove the heat at maximum OE boilup. In fact, the Salt Cell Vent Condenser (SCVC) should also have sufficient capacity to handle the maximum OE boilup. Therefore it would require simultaneous loss of OEC and/or SCVC condensing capacity for the steam valve failure to cause high benzene in the Process Vessel Vent System (PVVS).
Date:
September 29, 1992
Creator:
Jacobs, R. A.
Object Type:
Report
System:
The UNT Digital Library
Applications of Micellar Enzymology to Clean Coal Technology. Tenth Quarterly Report
Full implementation of coal fuel sources will require more effective methods of providing ``clean coal`` as a fuel source. Methods must be developed to reduce the sulfur content of coal which significantly contributes to environmental pollution. This project is designed to develop methods for pre-combustion coal remediation by implementing recent advances in enzyme biochemistry. The novel approach of this study is incorporation of hydrophilic oxidative enzymes in reverse micelles in an organic solvent. Enzymes from commercial sources or microbial extracts are being investigated for their capacity to remove organic sulfur from coal by oxidation of the sulfur groups, splitting of C-S bonds and loss of sulfur as sulfuric acid. Dibenzothiophene (DBT) and ethylphenylsulfide (EPS) are serving as models of organic sulfur-containing components of coal in initial studies.
Date:
April 29, 1992
Creator:
Walsh, C. T.
Object Type:
Report
System:
The UNT Digital Library
Texas Attorney General Opinion: DM-131
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Dan Morales, regarding a legal question submitted for clarification; Whether a hospital district may lease part of its facility for the operation of a private adolescent drug treatment facility (RQ-278)
Date:
June 29, 1992
Creator:
Texas. Attorney-General's Office.
Object Type:
Text
System:
The Portal to Texas History
Texas Attorney General Opinion: DM-132
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Dan Morales, regarding a legal question submitted for clarification; Interpretation of the prior continuous employment provision of the nepotism statute, V.T.C.S. article 5996a, section 1(b), and related questions (RQ-268)
Date:
June 29, 1992
Creator:
Texas. Attorney-General's Office.
Object Type:
Text
System:
The Portal to Texas History