FORM - 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003. COMPLETE SPECIFICATION
(See section 10; rule 13)
1. Title of the invention. : Environment friendly air filter cleaning
machine for Gas Turbine
2. Applicant (S)
(A) NAME OF APPLICANT : Gujarat Industries Power Company Limited.
(B) NATIONALITY : INDIAN
(C) ADDRESS P.O. Petrochemical-391346.,
Dist: BARODA. Gujarat State, INDIA.
3. Preamble to Description : The following specification Particularly
describe the invention and the manner in which it is to be performed

4. Description :
Automatic Filter Cleaning Machine consists of following major components.
1. Cleaning Chamber with filter table
2. Cyclone Separator
3. Dust Collector
4. Automatic sequence and timer unit
[1] Cleaning Chamber with filter table
Cleaning chamber is a cubicle box with toughened glass side walls. The reason of providing glass walls is to view cleaning process from outside. A door is provided on the top of cleaning chamber to load and unload the filter cartridge. Another door is also provided on front side of the chamber to facilitate cleaning of the chamber from inside.
On the bottom of the cleaning chamber, a filter table is provided, which is rotating slowly at @ 10 RPM. Filter table is having 3 nos. of locating pins, which allows easy fixing the filter exactly at the centre of the table. Filter table is getting drive through belt and pulley from gear reducer. Gear reducer in turn driven by a 3 phase motor.
Three air spray headers are provided inside the cleaning chamber. The spray headers are the most critical part of the machine. The design and location of spray headers is finalized after minute observation of cleaning process and certain practical experiments. Spray headers are having numbers of slits for discharge of air. Sizes of slits are calculated based on result of experiment. Two headers are provided on outer side of the filter and opposite to each other, while one header is provided on inner side of the filter. Numbers of jets of air are discharged from each header, which impinges on filter and remove dust from surface. A specific sequence is followed for firing of air from the above 3 headers in order to maximize the cleaning effect by using optimum quantity of air.

The above three spray headers are connected to supply of pressurized service air through three solenoid valves. Solenoid valves control the start/stop of air flow through spray header and sequence of operation.
Outlet of cleaning chamber is connected to cyclone chamber. Due to heavy suction from dust collector, mixture of air & dust released from filter is captured from cleaning chamber and directed to cyclone separator.
A limit switch is provided in top side door which stops turn table and air spray when door is opened for loading/unloading or due to any other problem.
[2] Cyclone Separator
Air and dust mixture from cleaning chamber enters into cyclone separator. Due to tangential entry, whirling of the air takes place. Dust particles being heavier, they are pushed towards outer walls and drop into conical bottom of the separator from where they are taken out. Hence, quite a good quantity of dust is separated from the air. Air with balance quantity of dust is taken out from the top of cyclone separator to dust collector for further removal of dust.
The function of cyclone separator is to reduce load of dust collector.
[3] Dust Collector
Dust collector unit consists of following main parts:
[A] Bag filter with pulse cleaning system
[B] Suction blower
[C] Control Penal

Brief description of the above parts are given as under.
[A] Bag filter with pulse cleaning system :
Dust laden air enters into dust collector through hopper due to suction of blower. The heavier dust particles strike on the baffle of hopper and drop into disposal box at the bottom. Air with fine and lighter dust particles is allowed to pass through bag filters.
Two nos. of bag filters are provided, which are cartridge type fine filters of 1 micron size. All the dust particles in the air get collected on the surface of filter cartridges. On the downstream of filter, only filtered air without dust particles is discharged into atmosphere.
Automatic pulse cleaning system is provided for online removal of dust from the bag filters. A pulse of pressurized service air (supplied externally) is released from the nozzle, which is located at the top of each filter. The puff of compressed air that travels down each filters expanding it and thereby dislodging the dust layer from the outer surface of the filter. Dust released from the filter is collected in the dust disposal box at the bottom.
Solenoid valves are provided for pulse cleaning, which provide regular air pulses at pre-programmed interval. Pressurized service air ( at 5 to 6 kg/cm2) is supplied from outside for pulse cleaning. To control sequence and on-off time of pulse cleaning, programmable timer and control unit is provided in dust collector control unit.
[B] Suction blower:
Suction blower is mounted on the top of dust collected unit. The blower sucks air from outlet of bag filter of dust collector. This blower creates negative pressure (vacuum) in entire upstream system. Due to partial

vacuum created by the blower, all the dust laden air released in cleaning chamber is sucked which prevents any contaminated air to leak into atmosphere.
[C] Control Penal:
Control penal is provided for start / stop of blower and to set pulse cleaning timer. Both ON time and OFF time of pulse can be increased or decreased as per dust loading of GT inlet air filters.
[4] Automatic sequence and timer unit
In filter cleaning machine, total three headers are provided at strategic locations { two from outside and one from inside of the filter to be cleaned ) to clean the filter from all directions. The effectiveness of cleaning process is solely depending upon sequence and timing of air spray from these headers. Moreover timing of operation of each spray header is also required to be adjusted as per loading of dust. For this purpose Automatic Sequence and Timer Control unit is provided.
This control unit actuates solenoid valves in predetermined sequence. ON timing of each solenoid valve can be set as per requirement. Once start command is given, entire sequence is executed automatically till filter cleaning is over. No manual intervention is required during the process.
Due to this automatic operation, time for cleaning is saved and all the filters are cleaned uniformly without any damage to its media,

5. CLAIMS: I/We claim
1. Automation of process with cleaning of filter in enclosed chamber to prevent air pollution.
2. To ensure effective & uniform cleaning of air filters.
3. To prevent health hazard to personals engaged in the job.
4. To minimize damage to air filters during cleaning.
5. To save time by automatic operations.