Exhaust gas purification system and ozone generator

Patent metadata

Field	Value
Publication number	US-9504961-B2
Application number	US-201414762913-A
Country	US
Kind code	B2
Filing date	Jan 30, 2014
Priority date	Feb 1, 2013
Publication date	Nov 29, 2016
Grant date	Nov 29, 2016

Abstract

An exhaust purifying system includes a selective reduction catalyst provided on an exhaust passage of an engine, a fluid supply device for supplying a urea fluid to a section of the exhaust passage that is upstream of the selective reduction catalyst, a gas separator for separating source gas into oxygen-enriched gas and nitrogen-enriched gas, an ozone generator that includes an ozone producing space, to which the oxygen-enriched gas is introduced, and produces ozone from the introduced oxygen-enriched gas, an ozone supplier for supplying ozone to a section of the exhaust passage that is upstream of the selective reduction catalyst, a vortex tube for separating the nitrogen-enriched gas into cool air and warm air and discharging the cool air and the warm air, and a cooling device for cooling the ozone producing space by applying the cool air discharged from the vortex tube to the ozone generator.

First claim

What is claimed is:

1. An exhaust purifying system comprising:
a selective reduction catalyst provided on an exhaust passage of an engine;
a fluid supply device configured to supply a urea fluid to a section of the exhaust passage that is upstream of the selective reduction catalyst;
a gas separator for separating source gas into oxygen-enriched gas and nitrogen-enriched gas;
an ozone generator that includes an ozone producing space, to which the oxygen-enriched gas is introduced, and produces ozone from the introduced oxygen-enriched gas;
an ozone supplier for supplying ozone to a section of the exhaust passage that is upstream of the selective reduction catalyst;
a vortex tube for separating the nitrogen-enriched gas into cool air and warm air and discharging the cool air and the warm air; and
a cooling device configured to cool the ozone producing space by applying the cool air discharged from the vortex tube to the ozone generator, wherein
the vortex tube is a first vortex tube, and the system further comprises a second vortex tube for separating the oxygen-enriched gas into cool air and warm air and discharging the cool air and the warm air separately, and
the cool air discharged from the second vortex tube is introduced to the ozone generator to produce ozone from the oxygen-enriched gas at a low temperature.

2. The exhaust purifying system according to claim 1 , further comprising:
a warm air passage for guiding the warm air discharged from the vortex tube to the fluid supply device;
a heat exchanger for increasing the temperature of the urea fluid with the warm air sent through the warm air passage; and
a valve for opening and closing the warm air passage.

3. The exhaust purifying system according to claim 1 , further comprising:
a warm air passage for guiding the warm air discharged from the vortex tube toward the engine;
a heat exchanger for warming up the engine with the warm air sent through the warm air passage; and
a valve for opening and closing the warm air passage.

4. The exhaust purifying system according to claim 1 , further comprising:
a compressor for compressing air; and
a dryer for drying compressed gas sent from the compressor and sending the dried compressed gas to the gas separator, wherein
the cooling device further includes:
a drain water supply passage for guiding water removed from the compressed gas by the dryer to the ozone generator; and
an absorbent material provided in the ozone generator, and
the cooling device causes the water to permeate the absorbent material and vaporizes water that has permeated the absorbent material by applying cool air ejected from the vortex tube to the absorbent material.

5. An ozone producing device comprising:
a gas separator for separating source gas into oxygen-enriched gas and nitrogen-enriched gas;
an ozone generator that includes an ozone producing space, to which the oxygen-enriched gas is introduced, and produces ozone from the introduced oxygen-enriched gas;
a vortex tube for separating the nitrogen-enriched gas into cool air and warm air and discharging the cool air and the warm air; and
a cooling device configured to cool the ozone producing space by applying the cool air discharged from the vortex tube to the ozone generator, where
the vortex tube is a first vortex tube, and the device further comprises
a second vortex tube for separating the oxygen-enriched gas into cool air and warm air and discharging the cool air and the warm air, wherein the cool air discharged from the vortex tube is introduced to the ozone generator to produce ozone from the oxygen-enriched gas at a low temperature.

Assignees

• Hino Motors Ltd

Inventors

• Tsumagari Ichiro
• Kawada Yoshihiro

Classifications

• B01D2256/10

  Nitrogen · CPC title

• F01N3/2066

  Selective catalytic reduction [SCR] · CPC title

• B01D2251/104

  Ozone · CPC title

• B01D53/261

  by adsorption · CPC title

• F01N2610/11

  the substance or part of the dosing system being cooled · CPC title