1. A stabilized biocidal dispersion comprising biocide coated or adsorbed on to stable sub-micronized carrier particles and wherein sub-micronized particles are stabilized with polar moieties, hydrophilic andor hydrophobic additives.
2. The biocidal dispersion according to claim 1, wherein the biocidal dispersion containing sub-micronized carrier particles is formulated in aqueous or non-aqueous medium.
3. The biocidal dispersion according to claim 1, wherein the carrier sub-micron particles are selected from the group consisting of metal oxide, alumina, silica, stilbene, carbon or clay.
4. The biocidal dispersion according to claim 3, wherein said sub-micronized metal oxide particles are comprised of ZnO, TiO2 or CeO2.
5. The biocidal dispersion according claim 1, comprising more than one biocide.
6. The biocidal dispersion according to claim 1, wherein the biocide employed for the biocidal dispersion is selected from the group consisting of amine reaction products, 1,2-benzisothiazolin-3-one, 2-bromo-2-nitropropane-1,3-diol (bronopol), 3-iodo-2-propargyl butyl carbamate (IPBC), 5-chloro-2-methyl-4-isothiazolin-3-one (CMIT)2-methyl-4-isothiazoli-3-one (MIT), bicyclic oxazolidines, glutaraldehyde, N-(trichloromethylthio)phthalimide biocides (Folpet), tetrachloroisophthalo-nitrile biocides, benzisothiazole (BIT), Zinc pyrithone, triazole andor tetrahydro-3,5-dimethyl-2h-1,3,5-thiodiazine-2-thione.
7. The biocidal dispersion according to claim 1, wherein the amount of biocide is in the range of about 1 to about 40 wt % of the total composition.
8. The biocidal dispersion according to claim 1, wherein the amount of stabilized sub-micron particles is in the range of about 0.001 to about 20 wt %.
9. The biocidal dispersion according to claim 1, wherein the polar moieties employed to form the stabilized sub-micron carrier particles are selected from the group consisting of carboxylic acids, esters, hydroxyl compounds or chelating compounds and salts thereof and wherein the ratio of sub-micron particles to polar moieties is in the range of about 1:1 to about 1:90.
10. The biocidal dispersion according to claim 1, wherein the hydrophobic additive or polymers employed to form the stabilized sub-micron carrier particles are selected from the group consisting of homopolymers, copolymers andor terpolymers.
11. The biocidal dispersion according to claim 1, wherein the sub-micronized particles are prepared by means of grinding andor milling techniques employing suitable dispersing agent and a single or mixture of solvents.
12. The biocidal dispersion prepared according to claim 1 that is UV protective, stabilized from yellowing, leach-proof and capable of providing transparent formulations.
13. The biocidal dispersion prepared according to claim 1 that provides enhanced biocidal activity than the biocidal dispersion which has regular carrier particles.
14. The biocidal dispersion prepared according to claim 1 employed in the field of personal care, paint, coating, building materials, stucco concrete, asphalt caulks, sealants, leather, wood, ink, pigment, metal working fluids, drilling mud, clay slurries and other related industrial applications thereof.
15. The biocidal dispersion prepared according to claim 1 capable of releasing the biocide content from sub-micronized particles in a sustained-release, controlled-release or delayed-release manner.
16. A process for preparing stabilized sub-micronized carrier particles comprising:
i. mixing the carrier particles, hydrophobic polymer, hydrophilic surfactant, polar moieties and a dispersing agent; and
ii. grinding or milling with suitable technique until the carrier particle sizes are in sub-micron ranges.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A gas turbine engine power system comprising:
a gas turbine engine system comprising a gas turbine engine coupled to an electrical generator through a first shaft, said gas turbine engine comprises a compressor, a combustion chamber, and a turbine drivingly coupled to said compressor and said electrical generator;
a source of bleed air from said compressor coupled in flow communication with an inlet of a variable speed booster; and
an air separation unit coupled in flow communication with an outlet of said variable speed booster, said variable speed booster coupled to a variable speed driving machine through a second shaft.
2. A system in accordance with claim 1, further comprising a variable speed drive selectably couplable to said electrical generator during a starting sequence of said gas turbine engine system in a first configuration of said gas turbine engine power system and to a variable speed electrical motor in a second configuration of said gas turbine engine power system.
3. A system in accordance with claim 2, wherein said variable speed drive comprises an electric power frequency converter.
4. A system in accordance with claim 2, wherein said variable speed drive comprises a at least one of a load commutated inverter (LCI) and a static starting equipment (SSE).
5. A system in accordance with claim 1, wherein said variable speed booster comprises one or more rows of variable guide vanes configured to modulate a flow through said variable speed booster.
6. A system in accordance with claim 1, wherein said variable speed booster comprises at least one of an axial booster and a centrifugal booster.
7. A system in accordance with claim 1, further comprising a compressed air supply system configured to deliver a flow of compressed air at a substantially constant pressure to an air separation unit, said compressed air supply system comprises a source of bleed air from said compressor, an intercooler, and a variable speed booster coupled in series flow communication.
8. A system in accordance with claim 1, wherein said variable speed motor is drivingly coupled to said variable speed booster, said booster further configured to deliver a flow of compressed air at a substantially constant pressure to the air separation unit using the variable speed motor to control a rotational speed of the variable speed booster.
9. A system in accordance with claim 1, wherein said variable speed drive comprises a load commutated inverter.
10. A system in accordance with claim 1, wherein said variable speed motor comprises a synchronous motor.
11. A method of operating an engine generator system, said method comprising:
electrically coupling an output of a variable speed drive to an engine generator;
starting the engine using the variable speed drive to motor the engine generator to a predetermined rotational speed; and
switching the output of the variable speed drive from the engine generator when the engine has started to a load such that starting and variable speed operation of the load is controlled using the variable speed drive.
12. A method in accordance with claim 11, wherein coupling an output of a variable speed drive to the engine generator comprises coupling an output of a load-commutated inverter to the engine generator.
13. A method in accordance with claim 11, wherein starting the engine using the variable speed drive comprises soft starting the engine by driving the engine generator as a synchronous motor.
14. A method in accordance with claim 11, wherein starting the engine comprises starting the engine using a load-commutated inverter.
15. A method in accordance with claim 11, wherein switching the output of the variable speed drive from the engine generator when the engine has started to a load comprises switching the output of the variable speed drive to a synchronous motor drivingly coupled to a variable speed booster.
16. A method in accordance with claim 15, wherein said engine generator system includes a compressor configured to supply a flow of compressed air to an air separation unit, said method further comprising maintaining a flow of compressed air that matches demand at a substantially constant pressure to an air separation unit coupled in flow communication with the compressor using the booster.
17. An integrated gasification combined cycle (IGCC) power system comprising:
a gas turbine engine generator system comprising a compressor, and a generator drivingly coupled to a gas turbine,
a variable speed booster coupled in flow communication between the compressor and an air separation unit, said variable speed booster configured to receive a flow of compressed air at a variable flow and pressure and to generate a flow of compressed air at a flow that matches demand using one or more variable vanes and a substantially constant pressure to said air separation unit, said variable speed booster drivingly coupled to a variable speed driving motor; and
a variable speed drive couplable to said generator during starting of said gas turbine engine generator system and to said variable speed driving motor when the gas turbine engine generator system is not being started.
18. An IGCC power system in accordance with claim 17, further comprising a gasification vessel configured to receive a flow of fuel and a flow of an oxidant, said gasification vessel configured to partially oxidize said flow of fuel using said flow of oxidant to generate a synthetic gas.
19. An IGCC power system in accordance with claim 17, wherein said variable speed driving motor comprises a synchronous motor.
20. An IGCC power system in accordance with claim 17, wherein said variable speed drive comprises a controller including a processor programmed to soft start said gas turbine engine generator system and disconnect said variable speed drive when said gas turbine engine generator system attains a predetermined rotational speed.
21. An IGCC power system in accordance with claim 17, wherein said variable speed drive comprises a controller including a processor programmed to:
receive signals relating to operating parameters of at least one of said gas turbine engine generator system and said variable speed booster; and
transmit command signals to said variable speed drive such that said variable speed booster is controlled to provide a flow that matches a demand of said air separation unit and a substantially constant pressure to said air separation unit.
22. An IGCC power system in accordance with claim 21, wherein said variable speed drive comprises a controller including a processor further programmed to transmit command signals to said gas turbine engine generator system such that said gas turbine engine generator system is controlled to provide a soft start of said generator operating as a synchronous motor.
23. An IGCC power system in accordance with claim 17, further comprising an intercooler coupled in flow communication between said compressor and said variable speed booster, said intercooler configured to reduce a temperature of the flow of compressed air from the compressor.