FORM – 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
PROVISIONAL
Specification
(See section 10 and rule 13)
METHOD OF PRODUCING AMORPHOUS RICE HUSK
ASH
an Indian Company
Chinchwad, Pune 411 019, Maharashtra, India
THE FOLLOWING SPECIFICATION DESCRIBES THE INVENTION.
1

FIELD OF INVENTION:
This invention envisages an effective and economic way of producing amorphous rice husk ash.
In particular, this invention relates to the development of a process and apparatus for effectively producing amorphous ash by burning of rice husk in a controlled combustion conditions and recovering the energy in the form of steam along with generating a value added product like amorphous ash with low loss on ignition value (LOI), which may be used for cement / concrete manufacturing / asbestos manufacturing / silica extraction for PV Cells / insulation linings / filtration applications.
PRIOR ART:
It is already known in the prior art that the agro wastes like rice husk, rice straw, soya straw, mustard straw being used to generate steam by combusting in the boiler. The residue (ash) after burning is being disposed off as landfill, which creates potential pollution hazard.
DRAWBACKS OF THE PRIOR ART:
1. High cost incurred in disposing the ash
2. Pollution hazard
OBJECTS OF THE INVENTION:
An object of this invention is to propose a novel process for the preparation of amorphous silica material from a silica containing organic agricultural product like rice husk.

Another object of this invention is to provide a process for the disposal of organic agricultural waste materials and particularly those having relatively high initial silica content.
Another object of this invention is the production of useful energy from organic agricultural waste material.
Another object of this invention is to provide a novel Fluidized bed combustor with recycle system capable of accomplishing the above objects by the incineration of organic material like rice husk by burning it in a very controlled atmosphere with a closely controlled temperature profile in the proposed combustor.
SUMMARY OF THE INVENTION:
In accordance with this invention there is provided a rice husk combustion system with a fluidized bed combustor with fines recirculation.
The rice husk combustion system in accordance with this invention produces amorphous ash.
This invention also envisages a rice husk combustion system, which provides useful heat energy.
The Rice husk combustion system of this invention can be used with either a normal bubbling bed system or a fines recirculation system or with a circulating fluidized bed system.
BRIEF DESCRIPTION OF THE DRAWING:

The invention will be described in detail with reference to a preferred embodiment. Reference to this embodiment does not limit the scope of the invention. In the accompanying drawing:
Figure 1 illustrates the proposed system wherein (1) is the normal known conventional Fluidised bed combustor with or without "inbed heat exchanger" (IBH) (2), extracting heat from the bed, capable of combusting agro wastes like rice husk, rice straw, soya straw, mustard straw. Agro waste is stored in silo (9) and fed into the combustor by any known means and the air is supplied with the assistance of blower / blowers (3). The products of combustion (flue gas) then passed through dust collection equipment (4), separated solids having higher carbon are then discharged back in to the system. The flue gas containing low carbon solids then exchanges heat in a heat exchanger (5) to recover the energy in the form of steam. The water is pumped using pump (8) in to the heat exchanger (5). The cooled flue gas is then passed through dust collection equipment (6) in order to collect the amorphous fly ash having low LOI. Finally the clean flue gas is vented to stack through ID fan (7).
ADVANTAGES OF THE NEW INVENTION:
1. Higher efficiency thus maximum energy recovery
2. Eliminates ash disposal cost
3. Replacement of costly additive like silica fumes in concrete
4. High corrosion resistance achieved by blending amorphous silica ash
5. Value added product with energy recovery.

While considerable emphasis has been placed herein on the specific structure of the preferred embodiment, it will be appreciated that many alterations can be made and that many modifications can be made in the preferred embodiment without departing from the principles of the invention. These and other changes in the preferred embodiment as well as other embodiments of the invention will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the invention and not as a limitation.
Dated this 7th day of April 2006
Mohan Dewan
Of R. K. Dewan & Co
Applicant's Patent Attorney