Title of Invention	"A BAGASSE DRYER"
Abstract	This invention relates to a bagasse dryer characterized in that a tube (1) having a distal and proximal end connected to an inlet feed tube (1") to introduce web bagasse (2) into the proximal end of said tube wherein the inlet tube comprising of a rotary valve (6) for regulation of the bagasse feed into said tube, an air preheater (4) to supply flue gases into the tube, distal end of which is connected to a cyclone separator (5) to cause separation of flue gases from the dried bagasse, which is discharged through air lock valve disposed at the bottom of the separator. (Fig. 1)

Title of Invention

"A BAGASSE DRYER"

Abstract

This invention relates to a bagasse dryer characterized in that a tube (1) having a distal and proximal end connected to an inlet feed tube (1") to introduce web bagasse (2) into the proximal end of said tube wherein the inlet tube comprising of a rotary valve (6) for regulation of the bagasse feed into said tube, an air preheater (4) to supply flue gases into the tube, distal end of which is connected to a cyclone separator (5) to cause separation of flue gases from the dried bagasse, which is discharged through air lock valve disposed at the bottom of the separator. (Fig. 1)

Full Text	FIELD OF INVENTION This invention relates to a bagasse dryer. BACKGROUND OF INVENTION It is known that bagasse is a by-product in sugar mills and is used as a fuel to produce steam for generation of power as well as heating and boiling of sugar juices etc. Apart from its use as a fuel, bagasse may be used for various other applications. Such other applications are by way of example for manufacture of paper and board, agricultural mulch and cattle bedding, and for manufacture of ethanol, furfural and xyiitol. The known parameter to increase the efficiency of a boiler, are provisions of an efficient economizer, super heater and the air heater, but a parameter of importance is a reduction in the moisture content in bagasse before it enters the furnace Table 1 below gives the boiler efficiency at different levels of moisture % bagasse. TABLE; I (Table Removed) Technical characteristics of bagasse at various level, of moisture % are given in Table II. TABLE, If CHARACTERISTICS OF BAGASSE (Table Removed) The importance of drying of bagasse is thus obvious, as bagasse saved can be utilized for other industries as raw material. Thus, it is apparent that to increase the boiler efficiency, the moisture content of green bagasse should be lowered. A bagasse drier is known :n the art, which consisted in providing a jacket under the cray of the bagasse elevator. The flue gas passed through the jacket. The bagasse travelling over the elevator trough was heated but the bagasse lost only about 1% moisture.OBJECTS OF THE INVENTION An object of this invention is to propose a bagasse dryer for lowering the moisture content in bagasse. Another object of this invention is to propose a bagasse dryer for lowering the moisture content in- bagasse, which lower the moisture content in bagasse so as to increase the boiler efficiency. Still another object of this invention is to propose a bagasse dryer for lowering the moisture content in bagasse, which is efficient. Further objects and advantages of this invention will be more apparent from the ensuing description. STATEMENT OF INVENTION According to this invention there is provided a bagasse dryer characterized in that a tube having a distal and proximal end connected to an inlet feed tube to introduce web bagasse into the proximal end of said tube wherein the inlet tube comprising of a rotary valve for regulation of the bagasse feed into said tube, an air preheater to supply flue gases into the tube, distal end of which is connected to a cyclone separator to cause separation of flue gases from the dried bagasse, which is discharged through air lock valve disposed at the bottom of the separator. BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING Further objects and advantages of this invention will be more apparent from the ensuing description when read in conjunction with the accompanying drawing and wherein: Fig. 1 shows: front elevation of bagasse dryer of the present invention. DETAIL DESCRIPTION OF THE INVENTION WITH REFERENCE TO THE ACCOMPANYING DRAWING; Reference may be made to fig. 1. In accordance with this invention, the bagasse dryer comprises a tube (1), preferably a vertical tube having a distal and proximal end. The wet bagasse (2) from an inlet feed tube (11 enters the proximal end of the tube. A rotary valve/Air lock (6) is provided in the inlet infeed tube to regulate the bagasse feed into said vertical tube. The feed tube comprising of a hopper (I") through which wet bagasse is admitted into the tube and the bagasse is carried by a conveyer (1"'). Hot flue gases from an air preheater (4) connected to an economizer (4') also enters at a temperature of 170 to 130°C preferably 140°C at the proximal end of the vertical tube, and such that the flue gases allows an upward flow of the bagasse to the distal end. As the bagasse is in contact with the flue gases during the upward flow within the vertical tube, the bagasse is dried. The vertical drier tube may be of any cross section. By way, of example, but without implying any limitation thereto, the vertical drier tube is of rectangular cross section. The length of vertical drier tube and the velocity of flue gases within said tube define the residence time of contact of the flue gases with the bagasse so as to cause a drying of the bagasse. Preferably, the velocity of the flue gases should be 25 to 35 m/s. If the velocity is less than 25 m/s, it is possible that the bagasse may not flow upwardly with the flue gases, [f the velocity of the flue gases is greater than 35 m/sec, then the drying of the bagasse may be reduced. The vertical drier tube may have a length of 15 to 35 m. The distal end of the vertical drier tube is connected to a cyclone separator (5) to cause a separation of the flue gases from the dried bagasse. However, a further drying of the bagasse is also effected in the separator. The dried bagasse is collected through a rotary valve/Air lock (6) at the bottom of cyclone separator on to a belt conveyor (7). The whole system operates on induced draft system. A booster ID Fan (8) is introduced before the regular ID Fan (9) which delivers the flue to chimney (10). For continuous withdrawal of collected dust, a rotary star valve, a double lock valve or a screw conveyor may be used. The flue gases may pass through any cleansing means so as to discharge clean flue gases into the atmosphere. It is to be noted that the present invention is susceptible to modifications, adaptations and changes by those skilled in the art. Such variant embodiments employing the concepts and features of this invention are intended to be within the scope of the present invention, which is further set forth under the following claims: - WE CLAIM; 1. A bagasse dryer characterized in that a tube (1) having a distal and proximal end connected to an inlet feed tube (1*) to introduce web bagasse (2) into the proximal end of said tube wherein the inlet tube comprising of a rotary valve (6) for regulation of the bagasse feed into said tube, an air preheater (4) to supply flue gases into the tube, distal end of which is connected to a cyclone separator (5) to cause separation of flue gases from the dried bagasse, which is discharged through air lock valve disposed at the bottom of the separator. 2. A bagasse dryer as claimed in claim 1 wherein the tube is preferably vertical. 3. A bagasse dryer as claimed in claim 1 or 2 wherein the temperature of flue gases is 170° to 130°C preferably 140°C. 4. A bagasse dryer as claimed in any one of the preceding claims wherein the velocity of the flue gases is 25-35 mt/sec and the length of the tube is 15-35 meter. 5. A bagasse dryer as claimed in any one of the preceding claims comprising a booster ID fan provided in front of regular ID fan, which delivers the flue to a chimney. 6. A bagasse dryer substantially as herein described with reference to accompanying drawings.

Full Text

FIELD OF INVENTION
This invention relates to a bagasse dryer.
BACKGROUND OF INVENTION
It is known that bagasse is a by-product in sugar mills and is used as a fuel to produce steam for generation of power as well as heating and boiling of sugar juices etc.
Apart from its use as a fuel, bagasse may be used for various other applications. Such other applications are by way of example for manufacture of paper and board, agricultural mulch and cattle bedding, and for manufacture of ethanol, furfural and xyiitol.
The known parameter to increase the efficiency of a boiler, are provisions of an efficient economizer, super heater and the air heater, but a parameter of importance is a reduction in the moisture content in bagasse before it enters the furnace
Table 1 below gives the boiler efficiency at different levels of moisture % bagasse.
TABLE; I

(Table Removed)
Technical characteristics of bagasse at various level, of moisture % are given in Table II.
TABLE, If CHARACTERISTICS OF BAGASSE
(Table Removed)
The importance of drying of bagasse is thus obvious, as bagasse saved can be utilized for other industries as raw material.
Thus, it is apparent that to increase the boiler efficiency, the moisture content of green bagasse should be lowered.
A bagasse drier is known :n the art, which consisted in providing a jacket under the cray of the bagasse elevator. The flue gas passed through the jacket. The bagasse travelling over the elevator trough was heated but the bagasse lost only about 1% moisture.OBJECTS OF THE INVENTION
An object of this invention is to propose a bagasse dryer for lowering the moisture content in bagasse.
Another object of this invention is to propose a bagasse dryer for lowering the moisture content in- bagasse, which lower the moisture content in bagasse so as to increase the boiler efficiency.
Still another object of this invention is to propose a bagasse dryer for lowering the moisture content in bagasse, which is efficient.
Further objects and advantages of this invention will be more apparent from the ensuing description.
STATEMENT OF INVENTION
According to this invention there is provided a bagasse dryer characterized in that a tube having a distal and proximal end connected to an inlet feed tube to introduce web bagasse into the proximal end of said tube wherein the inlet tube comprising of a rotary valve for regulation of the bagasse feed into said tube, an air preheater to supply flue gases into the tube, distal end of which is connected to a cyclone separator to cause separation of flue gases from the dried bagasse, which is discharged through air lock valve disposed at the bottom of the separator.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING
Further objects and advantages of this invention will be more apparent from the ensuing description when read in conjunction with the accompanying drawing and wherein:
Fig. 1 shows: front elevation of bagasse dryer of the present invention.
DETAIL DESCRIPTION OF THE INVENTION WITH REFERENCE TO THE ACCOMPANYING DRAWING;
Reference may be made to fig. 1. In accordance with this invention, the bagasse dryer comprises a tube (1), preferably a vertical tube having a distal and proximal end. The wet bagasse (2) from an inlet feed tube (11 enters the proximal end of the tube. A rotary valve/Air lock (6) is provided in the inlet infeed tube to regulate the bagasse feed into said vertical tube. The feed

tube comprising of a hopper (I") through which wet bagasse is admitted into the tube and the bagasse is carried by a conveyer (1"'). Hot flue gases from an air preheater (4) connected to an economizer (4') also enters at a temperature of 170 to 130°C preferably 140°C at the proximal end of the vertical tube, and such that the flue gases allows an upward flow of the bagasse to the distal end. As the bagasse is in contact with the flue gases during the upward flow within the vertical tube, the bagasse is dried.
The vertical drier tube may be of any cross section. By way, of example, but without implying any limitation thereto, the vertical drier tube is of rectangular cross section. The length of vertical drier tube and the velocity of flue gases within said tube define the residence time of contact of the flue gases with the bagasse so as to cause a drying of the bagasse. Preferably, the velocity of the flue gases should be 25 to 35 m/s. If the velocity is less than 25 m/s, it is possible that the bagasse may not flow upwardly with the flue gases, [f the velocity of the flue gases is greater than 35 m/sec, then the drying of the bagasse may be reduced. The vertical drier tube may have a length of 15 to 35 m.
The distal end of the vertical drier tube is connected to a cyclone separator (5) to cause a separation of the flue gases from the
dried bagasse. However, a further drying of the bagasse is also effected in the separator. The dried bagasse is collected through a rotary valve/Air lock (6) at the bottom of cyclone separator on to a belt conveyor (7). The whole system operates on induced draft system. A booster ID Fan (8) is introduced before the regular ID Fan (9) which delivers the flue to chimney (10).
For continuous withdrawal of collected dust, a rotary star valve, a double lock valve or a screw conveyor may be used.
The flue gases may pass through any cleansing means so as to discharge clean flue gases into the atmosphere.
It is to be noted that the present invention is susceptible to modifications, adaptations and changes by those skilled in the art. Such variant embodiments employing the concepts and features of this invention are intended to be within the scope of the present invention, which is further set forth under the following claims: -

WE CLAIM;
1. A bagasse dryer characterized in that a tube (1) having a distal and proximal end connected to an inlet feed tube (1*) to introduce web bagasse (2) into the proximal end of said tube wherein the inlet tube comprising of a rotary valve (6) for regulation of the bagasse feed into said tube, an air preheater (4) to supply flue gases into the tube, distal end of which is connected to a cyclone separator (5) to cause separation of flue gases from the dried bagasse, which is discharged through air lock valve disposed at the bottom of the separator.
2. A bagasse dryer as claimed in claim 1 wherein the tube is preferably vertical.
3. A bagasse dryer as claimed in claim 1 or 2 wherein the temperature of flue gases is 170° to 130°C preferably 140°C.
4. A bagasse dryer as claimed in any one of the preceding claims wherein the velocity of the flue gases is 25-35 mt/sec and the length of the tube is 15-35 meter.
5. A bagasse dryer as claimed in any one of the preceding claims comprising a booster ID fan provided in front of regular ID fan, which delivers the flue to a chimney.

6. A bagasse dryer substantially as herein described with reference to accompanying drawings.

Documents:

1213-DEL-2005-Abstract-(29-05-2009).pdf

1213-del-2005-abstract.pdf

1213-DEL-2005-Claims-(29-05-2009).pdf

1213-del-2005-claims.pdf

1213-DEL-2005-Correspondence-Others (13-01-2010).pdf

1213-DEL-2005-Correspondence-Others-(03-06-2009).pdf

1213-DEL-2005-Correspondence-Others-(29-05-2009).pdf

1213-del-2005-correspondence-others.pdf

1213-del-2005-correspondence-po.pdf

1213-DEL-2005-Description (Complete)-(29-05-2009).pdf

1213-del-2005-description (complete).pdf

1213-del-2005-description (provisional).pdf

1213-DEL-2005-Drawings-(03-06-2009).pdf

1213-del-2005-drawings.pdf

1213-DEL-2005-Form-1-(29-05-2009).pdf

1213-del-2005-form-1.pdf

1213-del-2005-form-18.pdf

1213-DEL-2005-Form-2-(29-05-2009).pdf

1213-del-2005-form-2.pdf

1213-DEL-2005-Form-3-(29-05-2009).pdf

1213-del-2005-form-5.pdf

1213-DEL-2005-GPA (13-01-2010).pdf

1213-DEL-2005-Others-Document-(29-05-2009).pdf

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Patent Number

240213

Indian Patent Application Number

1213/DEL/2005

PG Journal Number

19/2010

Publication Date

07-May-2010

Grant Date

29-Apr-2010

Date of Filing

11-May-2005

Name of Patentee

THE UGAR SUGAR WORKS LTD.,

Applicant Address

THE UGAR SUGAR WORKS LTD, UGAR KHURD, KARNATAKA.

Inventors:

#	Inventor's Name	Inventor's Address
1	MR. PREM KUMAR NARAYAN SINGH	THE SUGAR TECHNOLOGIST ASSOCIATION OF INDIA, NEW DELHI
2	MR. R.V. SHIRGAOKAR	THE UGAR SUGAR WORKS LTD., UGAR KHURD, KARNATAKA.

PCT International Classification Number

F23G7/02

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA