Title of Invention	"AN AIR POLLUTION CONTROL DEVICE"
Abstract	This invention relates to an air pollution control device. The device has an air preheater adapted to be connected with the main air preheater provided with the boiler assembly. The flue gases outlet of the air preheater is connected to a desulfurisation chamber is provided for the desulfurisation of sulphur and is connected to an oxidization zone of a first chamber in flow communication thereof The oxidization zone is provided for converting NO into No2 is connected to a NC2 and ash removal zone of the first chamber. The NCh and ash removal zone are connected to the polishing zone of a second chamber is provided to neutralize all kind of pollutants therein. The polishing zone connected to a flue gases washing zone is connected to a water settle zone provided for removing water droplets entrapped in the flue gases. The outlet of water settle zone is connected to a chimney through an induced draft fan.

Title of Invention

"AN AIR POLLUTION CONTROL DEVICE"

Abstract

This invention relates to an air pollution control device. The device has an air preheater adapted to be connected with the main air preheater provided with the boiler assembly. The flue gases outlet of the air preheater is connected to a desulfurisation chamber is provided for the desulfurisation of sulphur and is connected to an oxidization zone of a first chamber in flow communication thereof The oxidization zone is provided for converting NO into No2 is connected to a NC2 and ash removal zone of the first chamber. The NCh and ash removal zone are connected to the polishing zone of a second chamber is provided to neutralize all kind of pollutants therein. The polishing zone connected to a flue gases washing zone is connected to a water settle zone provided for removing water droplets entrapped in the flue gases. The outlet of water settle zone is connected to a chimney through an induced draft fan.

Full Text	This invention relates to an air pollution control device. Particularly, this invention relates to an air pollution control device for use with the chimney/exhaust outlets of the power station and/or other industries. A device is also useful to use with the motor vehicles for controlling air pollution caused by the emissions/exhaust. The air pollution control devices to use with the chimneys are as such known in the art. One of the said device is a mechanical dust collector which is used to collect the dust only from the exhaust but not other harmful and polluting gases like Sulfur based pollutant and nitrogen based pollutant from the exhaust. Further it is not possible to recover the heat energy from the exhaust. Bag filters are known in the art to filter the dust particle only but not nitrogen based pollutant and sulfur. Therefore these filters are not useful and also cannot be used in the big plants due to exaurbitent cost and maintenance charges and maintenance problem.Another air pollutant control device known as electrostatic precipitator is known. The ESP.comprises heating a big cylindrical hollow body having a plurality of electrodss disposed therein. An inlet is provided at one end of the cylindrical body and an outlet is provided at other end of the body. There are disadvantages associated with the device. One of the main disadvantage is that this device is only used to collect the fly ash from the flue gases of a boiler plant and not for removal of pollutants.Another disadvantage is that these devices are not capable and maintaining good performance throughout services period. Another disadvantage is that it requires a large area to install this device and the installation cost is very high. Similarly maintenance cost of this device is very high. Yet another disadvantage is that the device is not capable to remove/neutralize sulfur based pollutant and nitrogen based pollutant present in the flue gases.: 4 : Still another disadvantage is that the device is not capable to recover the heat energy from the flue gases and a lot of heat energy is wasted and thus a lot of fuel is required to operate the boiler. Still another disadvantage is that the height of the flue gases chimney is kept very high and thus the cost of the device increases. Therefore the main object of this invention is to propose a novel air pollution control device for use with the chimney of the power station and other air polluting industries. Another object of this invention is to propose a novel air pollution control device having the means to recover heat energy from the flue gases. Still another object of this invention is to propose a novel pollution control device which neutralizes/removes even the nitrogen based pollutant and sulfur based pollutant present in the air.: Still another object of this invention is to propose a novel air pollution control device which is 50% cheaper in cost than the cost of an electrostatic precipitator and is almost maintenance free. Yet another object of this invention is to propose a novel air pollution control device which is compact in size and requires 50% space only than the space required to install electro static precipitator device. Still another object of this invention is that very less electric energy is required to facilitate the operation of the device and thus it saves the consumption of electric energy as required to operate the E.S.P.till another object of this invention is to provide a novel air pollution control device wherein height of the chimney is reduced substantially in order to reduce the cost of the device.: 6 : According to this invention there is provided an air pollution control device comprising an air preheater adapted to be connected with the main air preheater provided with the boiler assembly, the flue gases outlet of said air preheater being connected to a desulfurisation chamber provided for the desulfurisation of sulphsur and being connected to an oxidation zone of a first chamber in flow communication thereof, said oxidation zone provided for converting NO2 into NO2 being connected to a NC2 and ash removal zone of said first chamber, said NO2 and ash removal zone connected to the polishing zone of a second chamber being provided to neutralize all kind of pollutants therein, said polishing zone connected to a flue gases washing zone being connected to a water settle zone provided for removing water droplets entrapped in the flue gases, the outlet of water settle zone being connected to a chimney through an induced draft fan. In accordance with this invention the air polluting device has an air preheating means adapted to be connected with the air preheating means of the power plant. The flue gases outlet of the air preheating means is connected to a desulfurisation chamber provided for removing the sulfur contents from the flue gases by spraying lime into said chamber and also for increasing the density of ash particles by moisturising the same. Raw water spraying means are provided for removing solid particles from the conical bottom end of the zones/chambers. The desulfurisation chamber is connected to an oxidation zone provided in the first chamber for converting NO into NO2 by spraying potassium per magnate (KmnO4 from the top with the help of spraying means provided at the top of the first chamber. The oxidation chamber is connected to a NO2 and and ash removal chamber provided for removing NO2 as well as ash contents by spraying lime with the help of spraying means provided into said chamber. The NO2 and ash removal zone of first chamber is connected to a polishing zone of the second chamber provided for removing ash contents and/or other pollutants like NOX, SOX etc. by spraying castic soda with the help of spraying means provided at one side of the second chamber. The polishing zone of the second chamber is connected to a flue gas washing zone of said chamber provided for removing left over solid particles from the flue gases by spraying water with the help of the spraying means provided at the other side of the seconds chamber. The flue gases washing zone is connected to water settling chamber provided for removing water entrapped in the flue gases. The cross-section of the water settling chamber is larger than the cross-section of the other zones/chambers so as to reduce the velocity of the flue gases in order to remove the water droplets entrapped in the flue gases. The outlet provided at the top end of the water settling chamber is connected to an exhaust chimney through a enduced draft fan provided to facilitate exit of the flue gases through chimney. A forced draft fan is provided with the air preheater of the device for providing atmospheric air to the air preheater which is supplied to the main air preheater of the boiler assembly of the power plant after preheating. The bottom ends of the said zones/chambers are provided in the conical form in order to facilitate the removal of the pollutants into the pollutant drainage means provided below and outlets of said zones and chamber collected therein. A water jet is provided at one end of the pollutant drainage means to facilitate the drainage of the pollutants with the help of water pressure.An air pollution control device according to a preferred embodiment is herein described and illustrated in the accompanying drawings whereins-fig.l shows the plan view of the device. Referring to the drawing fig.l the air pollution control device has an air preheater 1 adapted to he connected to a main preheater M of the ~ff boiler assembly of the power plant. A forced draft fan 2 is provided to supply atmospheric air to the cold air inlet of the air preheater 1. The flue gases outlet of main preheater M is connected to the inlet 3 of the preheater 1 wherein the cold air is heated and is supplied to the main preheater after preheating. The flue gases outlet 4 of the preheater is connected to a desulphurisation chamber 5 provided to remove SOX contents from the flue gases by spraying lime with the help of lime spraying means & provided at one side of the desulphurisation chamber 5. Also the density of ash contents is increased therein by moisturisation. Raw water spraying means 7 are provided for spraying water in the bottom end of desulphurisation zone for removal of the solid particles collected therein.: 10 : The desulphur!sation chamber 5 is connected to the oxidation zone 8 of a second chamber 9 is provided for converting NO2 into NO2 by spraying KmnO4 with the help of spraying means 10 provided at the top surface of the second chamber 9. The oxidation zone of the second chamber is connected to NO2 and ash removal zone 11 of said chamber provided for removing NO2 and ash contents from the flue gases by spraying lime again with the help of lime spraying means 12 provided at the side of the second chamber 9. The ash removal zone is connected to a polishing zone 13 of a third chamber 14 and provided for removing polluting/acid gases present in the flue gases by spraying a strong alkali solution like castic soda (N2OH) with the help of the spraying means 15 provided at the side of the third chamber 14. The polishing zone of the third chamber 14 is connected to a flue gas washing zone 16 provided for removing left over solid particles present in the flue gases if any. By spraying water with the help of water spraying means 17 provided on the other side of the third chamber 14. The flue gas washing zone of the third chamber is connected to a water settling chamber 18 provided for: i removing Mater droplets entrapped in the flue gases. For this purpose the size of the Mater settling chamber has been increased in order to reduce the velocity of the flue gases therein such that to provide subsequent time for the removal of the Mater droplets from the flue gases. The output provided towards the top end of the Mater settling chamber is connected to a chimney 19 through an induced draft fan 20 provided for facilitating the exit of the flue gases through the chimney 19. The loMer ends of the different zones and chambers are provided in the conical shape such that to facilitate the removal of the pollutants collected therein during the operation of the device. The pollutant collection and drainage means 21 are provided below the outlets of said zones/chambers for the removal of the pollutants. A Mater jet 22 is provided at one end of the drainage means 21 for facilitating the draining of the pollutants Mith the help of water pressure provided in the drainage means. Measuring instruments 23, 24 and 25 are provided for monitoring the pollution contents present in the flue gases and draining effluents. According to an option soda S, lime stone and castle soda will be sprayed instead of lime spray wherever required. WE CLAIM: 1. An air pollution control device characterised by an air preheater adapted to be connected with the main air preheater provided with the boiler assembly, the flue gases outlet of said air preheater being connected to a desulfurisation chamber provided for the desulfurisation of sulphur and being connected to an oxidation zone of a first chamber in flow communication thereof, said oxidation zone provided for converting NO into NO2 being connected to a NO2 and ash removal zone of said first chamber, said NO2 and ash removal zone connected to the polishing zone of a second chamber being provided to neutralize all kind of pollutants as herein described, said polishing zone connected to a flue gases washing zone being connected to a water settle zone provided for removing water droplets entrapped in the flue gases, the outlet of water settle zone being connected to a chimney through an induced draft fan. 2. A device as claimed in claim 1 wherein said air preheater comprises a plurality of coils disposed in a heating chamber for allowing cold air passing therethrough the inlet chamber, an outlet chamber being provided for facilitating the exit of the hot air from the heating chamber.-13- 3. An air pollution control device substantially as herein described and illustrated.

Full Text

This invention relates to an air pollution control device. Particularly, this invention relates to an air pollution control device for use with the chimney/exhaust outlets of the power station and/or other industries. A device is also useful to use with the motor vehicles for controlling air pollution caused by the emissions/exhaust. The air pollution control devices to use with the chimneys are as such known in the art.
One of the said device is a mechanical dust collector which is used to collect the dust only from the exhaust but not other harmful and polluting gases like Sulfur based pollutant and nitrogen based pollutant from the exhaust. Further it is not possible to recover the heat energy from the exhaust. Bag filters are known in the art to filter the dust particle only but not nitrogen based pollutant and sulfur. Therefore these filters are not useful and also cannot be used in the big plants due to exaurbitent cost and maintenance charges and maintenance problem.Another air pollutant control device known as electrostatic precipitator
is known. The ESP.comprises heating a big cylindrical hollow body having a plurality of electrodss disposed therein. An inlet is provided at one end of the cylindrical body and an outlet is provided at other end of the body.
There are disadvantages associated with the device. One of the main disadvantage is that this device is only used to collect the fly ash from the flue gases of a boiler plant and not for removal of pollutants.Another disadvantage is that these devices are not capable and maintaining good performance throughout services period.
Another disadvantage is that it requires a large area to install this device and the installation cost is very high. Similarly maintenance cost of this device is very high.
Yet another disadvantage is that the device is not capable to remove/neutralize sulfur based pollutant and nitrogen based pollutant present in the flue gases.: 4 :
Still another disadvantage is that the device is not capable to recover the heat energy from the flue gases and a lot of heat energy is wasted and thus a lot of fuel is required to operate the boiler.
Still another disadvantage is that the height of the flue gases chimney is kept very high and thus the cost of the device increases.
Therefore the main object of this invention is to propose a novel air pollution control device for use with the chimney of the power station and other air polluting industries.
Another object of this invention is to propose a novel air pollution control device having the means to recover heat energy from the flue gases.
Still another object of this invention is to propose a novel pollution control device which neutralizes/removes even the nitrogen based pollutant and sulfur based pollutant present in the air.:
Still another object of this invention is to propose a novel air pollution control device which is 50% cheaper in cost than the cost of an electrostatic precipitator and is almost maintenance free.
Yet another object of this invention is to propose a novel air pollution control device which is compact in size and requires 50% space only than the space required to install electro static precipitator device.
Still another object of this invention is that very less electric energy is required to facilitate the operation of the device and thus it saves the consumption of electric energy as required to operate the E.S.P.till another object of this invention is to provide a novel air pollution control device wherein height of the chimney is reduced substantially in order to reduce the cost of the device.: 6 :
According to this invention there is provided an air pollution control device comprising an air preheater adapted to be connected with the main air preheater provided with the boiler assembly, the flue gases outlet of said air preheater being connected to a desulfurisation chamber provided for the desulfurisation of sulphsur and being connected to an oxidation zone of a first chamber in flow communication thereof, said oxidation zone provided for converting NO2 into NO2 being connected to a NC2 and ash removal zone of said first chamber, said NO2 and ash removal zone connected to the polishing zone of a second chamber being provided to neutralize all kind of pollutants therein, said polishing zone connected to a flue gases washing zone being connected to a water settle zone provided for removing water droplets entrapped in the flue gases, the outlet of water settle zone being connected to a chimney through an induced draft fan.
In accordance with this invention the air polluting device has an air preheating means adapted to be connected with the air preheating means of the power plant. The flue gases outlet of the air preheating means is connected to a desulfurisation chamber provided for removing the sulfur contents
from the flue gases by spraying lime into said chamber and also for increasing the density of ash particles by moisturising the same. Raw water spraying means are provided for removing solid particles from the conical bottom end of the zones/chambers. The desulfurisation chamber is connected to an oxidation zone provided in the first chamber for converting NO into NO2 by spraying potassium per magnate (KmnO4 from the top with the help of spraying means provided at the top of the first chamber. The oxidation chamber is connected to a NO2 and and ash removal chamber provided for removing NO2 as well as ash contents by spraying lime with the help of spraying means provided into said chamber. The NO2 and ash removal zone of first chamber is connected to a polishing zone of the second chamber provided for removing ash contents and/or other pollutants like NOX, SOX etc. by spraying castic soda with the help of spraying means provided at one side of the second chamber. The polishing zone of the second chamber is connected to a flue gas washing zone of said chamber provided for removing left over solid particles from the flue gases by spraying water with the help of the spraying means provided at the other side of the seconds
chamber. The flue gases washing zone is connected to
water settling chamber provided for removing water entrapped in the flue gases. The cross-section of the
water settling chamber is larger than the cross-section of the other zones/chambers so as to reduce the velocity
of the flue gases in order to remove the water droplets entrapped in the flue gases. The outlet provided at
the top end of the water settling chamber is connected to an exhaust chimney through a enduced draft fan
provided to facilitate exit of the flue gases through chimney. A forced draft fan is provided with the air
preheater of the device for providing atmospheric air to the air preheater which is supplied to the main air
preheater of the boiler assembly of the power plant after preheating. The bottom ends of the said
zones/chambers are provided in the conical form in order to facilitate the removal of the pollutants into the
pollutant drainage means provided below and outlets of said zones and chamber collected therein. A water jet is
provided at one end of the pollutant drainage means to facilitate the drainage of the pollutants with the help
of water pressure.An air pollution control device according to a preferred embodiment is herein described and illustrated in the accompanying drawings whereins-fig.l shows the plan view of the device.
Referring to the drawing fig.l
the air pollution control device has an air preheater 1 adapted to he connected to a main preheater M of the ~ff
boiler assembly of the power plant. A forced draft fan 2 is provided to supply atmospheric air to the cold air
inlet of the air preheater 1. The flue gases outlet of main preheater M is connected to the inlet 3 of the
preheater 1 wherein the cold air is heated and is supplied to the main preheater after preheating. The
flue gases outlet 4 of the preheater is connected to a desulphurisation chamber 5 provided to remove SOX
contents from the flue gases by spraying lime with the help of lime spraying means & provided at one side of
the desulphurisation chamber 5. Also the density of ash contents is increased therein by moisturisation. Raw
water spraying means 7 are provided for spraying water in the bottom end of desulphurisation zone for
removal of the solid particles collected therein.: 10 :
The desulphur!sation chamber 5 is connected to the oxidation zone 8 of a second chamber 9 is provided for converting NO2 into NO2 by spraying KmnO4 with the help of spraying means 10 provided at the top surface of the second chamber 9. The oxidation zone of the second chamber is connected to NO2 and ash removal zone 11 of said chamber provided for removing NO2 and ash contents from the flue gases by spraying lime again with the help of lime spraying means 12 provided at the side of the second chamber 9. The ash removal zone is connected to a polishing zone 13 of a third chamber 14 and provided for removing polluting/acid gases present in the flue gases by spraying a strong alkali solution like castic soda (N2OH) with the help of the spraying means 15 provided at the side of the third chamber 14. The polishing zone of the third chamber 14 is connected to a flue gas washing zone 16 provided for removing left over solid particles present in the flue gases if any. By spraying water with the help of water spraying means 17 provided on the other side of the third chamber 14. The flue gas washing zone of the third chamber is connected to a water settling chamber 18 provided for: i
removing Mater droplets entrapped in the flue gases. For this purpose the size of the Mater settling chamber
has been increased in order to reduce the velocity of the flue gases therein such that to provide subsequent
time for the removal of the Mater droplets from the flue gases. The output provided towards the top end of the
Mater settling chamber is connected to a chimney 19 through an induced draft fan 20 provided for
facilitating the exit of the flue gases through the chimney 19. The loMer ends of the different zones and
chambers are provided in the conical shape such that to facilitate the removal of the pollutants collected
therein during the operation of the device. The pollutant collection and drainage means 21 are provided
below the outlets of said zones/chambers for the removal of the pollutants. A Mater jet 22 is provided at one
end of the drainage means 21 for facilitating the draining of the pollutants Mith the help of water
pressure provided in the drainage means. Measuring instruments 23, 24 and 25 are provided for monitoring
the pollution contents present in the flue gases and draining effluents.
According to an option soda S, lime stone and
castle soda will be sprayed instead of lime spray wherever required.

WE CLAIM:
1. An air pollution control device characterised by an air preheater
adapted to be connected with the main air preheater provided with
the boiler assembly, the flue gases outlet of said air preheater
being connected to a desulfurisation chamber provided for the
desulfurisation of sulphur and being connected to an oxidation
zone of a first chamber in flow communication thereof, said
oxidation zone provided for converting NO into NO2 being
connected to a NO2 and ash removal zone of said first chamber,
said NO2 and ash removal zone connected to the polishing zone of
a second chamber being provided to neutralize all kind of
pollutants as herein described, said polishing zone connected to a
flue gases washing zone being connected to a water settle zone
provided for removing water droplets entrapped in the flue gases,
the outlet of water settle zone being connected to a chimney
through an induced draft fan.
2. A device as claimed in claim 1 wherein said air preheater
comprises a plurality of coils disposed in a heating chamber for
allowing cold air passing therethrough the inlet chamber, an outlet
chamber being provided for facilitating the exit of the hot air from
the heating chamber.-13-
3. An air pollution control device substantially as herein described and illustrated.

Documents:

495-del-2000-abstract.pdf

495-del-2000-assignment.pdf

495-del-2000-claims.pdf

495-del-2000-correspondence-others.pdf

495-del-2000-correspondence-po.pdf

495-del-2000-description (complete).pdf

495-del-2000-drawigns.pdf

495-del-2000-form-1.pdf

495-del-2000-form-19.pdf

495-del-2000-form-2.pdf

495-del-2000-form-6.pdf

495-del-2000-gpa.pdf

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Patent Number

227138

Indian Patent Application Number

495/DEL/2000

PG Journal Number

04/2009

Publication Date

23-Jan-2009

Grant Date

02-Jan-2009

Date of Filing

10-May-2000

Name of Patentee

NATIONAL RESEARCH DEVELOPMENT CORPORATION

Applicant Address

20-22, ZAMRUDPUR COMMUNITY CENTRE, KAILASH COLONY EXTENSION, NEW DELHI- 110 048.

Inventors:

#	Inventor's Name	Inventor's Address
1	ANOOP KISHORE SINGH	C-11, RENUSAGAR COLONY, DISTT. SONEBHADRA-231 218, UTTAR PRADESH, INDIA.
2	SNEHLATA SINGH	C-11, RENUSAGAR COLONY, DISTT. SONEBHADRA-231 218, UTTAR PRADESH, INDIA.

PCT International Classification Number

N/A

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA