Method and device for pelletizing unprocessed cellulosic fibrous material

a cellulosic fibrous material and unprocessed technology, applied in the direction of manufacturing tools, combustion types, lighting and heating apparatuses, etc., can solve the problems of increasing the price of raw materials, reducing the desirability of wood as a renewable energy source, and many losses, so as to achieve high calorific value and high fire risk

Inactive Publication Date: 2007-04-19
CARGILL INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0037] Another object of this invention is to provide a method and a device for the production of unprocessed sugar-cane pellets, correcting the operational difficulties faced by the previous mentioned attempts on an industrial scale, e.g. the high bagasse drying temperature and therefore the high fire risk. One further object of this invention is to provide unprocessed sugar-cane bagasse pellets to be used in pl

Problems solved by technology

It is simple to imagine that these sources are also finite sources, and that an increase of wood fuel consumption would not only lead to an increase in the price of these raw materials but also to the loss of many forests since a tree needs a long growth period, which decreases the desirability of wood as a renewable energy source.
However in this state, the bagasse cannot be transported elsewhere as a fuel due to the low calorific value (8-9 Giga Joules per metric ton), and transporting issues.
This process makes use of the wasted heat or the heat wrongly used in sugar cane and alcohol factories by drying or dehydrating the bagasse, increasing its lower heat power (Kcal/Kg).
Thus, this method can only be used for the pelletization of some materials.
How

Method used

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  • Method and device for pelletizing unprocessed cellulosic fibrous material
  • Method and device for pelletizing unprocessed cellulosic fibrous material
  • Method and device for pelletizing unprocessed cellulosic fibrous material

Examples

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example

[0144] The method and the setup of the device as claimed in the present application has been achieved through tests at our pilot pelletization plant, using the following equipment:

[0145] One carbon steel grain hopper to receive and store raw material, with 9 m3 capacity.

[0146] One screw transporter, with a 10-12 metric ton / hour capacity, driven by a 5 hp at 1,750 rpm motor, to feed the vibrating sifter.

[0147] One vibrating sifter, with a 10-12 metric ton / hour capacity, driven by a 5 hp at 1,750 rpm motor, to separate the unprocessed sugar-cane bagasse.

[0148] One screw transporter, with a 10-12 metric ton / hour capacity, driven by a 5 hp at 1,750 rpm motor, to feed the dryer.

[0149] One spinning tube dryer, with a 10-12 metric ton / hour capacity, driven by a 7.5 hp at 1,750 rpm motor.

[0150] One hot-gas exhaust, with a 1,000 m3 / hour capacity, driven by a 25 hp at 1,750 rpm motor.

[0151] One cyclone to separate dust, with a 5 metric ton / hour capacity.

[0152] One fan to insufflate ho...

working example

[0168] With reference to FIG. 1 and the listing of material as above, sugar-cane bagasse is first continuously fed into a feed box (2), and loosened and flattened by a sprayer (3). The feed box can hold a 15-minute supply in relation to the plant output capacity and has a cleated type conveyor belt to transport the unprocessed sugar-cane bagasse. Then, ferrous material and impurities of the unprocessed sugar-cane bagasse are removed by an electromagnet (5) with a minimum magnetic capacity of 1,500 gauss, and any other impurities are removed by a di-stone (6) consisting of 5 to 8 perpendicular axes with star-shaped knives that counter rotate.

[0169] Then, the unprocessed sugar-cane bagasse is dried in a spinning tube dryer (8) using a system of bundled tubes conveying saturated steam at 9 kgf / cm2, at a temperature of about 175° C. inside the tube, providing indirect contact with the product in the tube's external wall (i.e. the steam inside the pipes dry without contact with the baga...

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Abstract

The present invention relates to a method and a device for pelletizing unprocessed cellulosic fibrous material on an industrial scale, and in particular to the use of said unprocessed cellulosic fibrous material pellets as a combustible fuel product.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims the benefit of U.S. Provisional Application No. 60 / 721,358, filed Sep. 28, 2005. The subject application also claims priority to European Patent Application No. 05021213.3, filed Sep. 28, 2005.FIELD OF THE INVENTION [0002] The present invention relates to a method and a device for pelletizing unprocessed cellulosic fibrous material, in particular sugar-cane bagasse, on an industrial scale, and in particular to the use of said unprocessed cellulosic fibrous material pellets as a combustible fuel product. BACKGROUND OF THE INVENTION [0003] Since fossil fuel has become a finite energy source, in the last decades many efforts have been put into the production of alternative energy materials. These alternative materials should not only be affordable and readily available, they also should be preferably derived from renewable sources. Among the existing renewable alternatives to fossil fuels, biomass has raised great i...

Claims

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Application Information

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IPC IPC(8): F23G5/02C10L5/00
CPCB01J2/12B30B11/201C10L5/363C10L5/366C10L5/44C10L5/48F23G5/02F23G5/04F23G7/02F23G2201/101F23G2201/602F23G2900/50206Y02E20/12Y02E50/10Y02E50/30
Inventor LANA, PEDRO LUDOVICOCURRAN, MICHAEL
Owner CARGILL INC
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