# US 11,078,818 B2 · System for reducing particulate matter in exhaust gas

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,078,818 B2
- Document ID: US11078818B2
- Status: Granted
- Kind: B2
- Application number: 16/640,310
- Filed: 2017-08-22
- Published: 2020-08-13
- Granted: 2021-08-03
- Earliest claimed: 2017-08-22
- Assignees: Prime Solution, Inc.
- Applicants: The Prime Solution L.L.C.
- Inventors: Chang Soo Son
- Web page: https://patentgrep.com/patent/US11078818B2

## CPC

- F01N 3/01: by means of electric or electrostatic separators
- F01N 3/027: using electric or magnetic heating means
- F01N 2240/28: a plasma reactor
- F01N 2470/02: Tubes being perforated
- F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16)

## Abstract

A disclosed system for reducing particulate matter in an exhaust gas includes: a first conductor provided in the form of a tubular body through which a gas stream flows, and to which a ground power supply is connected; a second conductor disposed within the first conductor and having an emitter which comes into contact with the gas stream and generates non-thermal plasma (NTP); and an insulator for electrically separating the second conductor from the first conductor, in which a predetermined level of direct current voltage is continuously applied to the second conductor.

## Claims

### Claim 1

A system for reducing particulate matter in an exhaust gas, the system comprising:
a first conductor provided in the form of a tubular body through which a gas stream flows and to which a ground power supply is connected;
a second conductor disposed in the first conductor and having an emitter which comes into contact with the gas stream and generates non-thermal plasma (NTP); and
an insulator configured to electrically separate the second conductor from the first conductor,
wherein a predetermined level of direct current voltage is continuously applied to the second conductor,
wherein the second conductor includes:
a vertical rod disposed in a radial direction of the first conductor;
a horizontal rod extending from an end of the vertical rod in a direction parallel to a flow direction of the gas stream; and
the emitter provided at an end of the horizontal rod and having multiple protrusions formed on an outer surface of the emitter and each having a cutting edge,
wherein the insulator is made of an electrically insulating material and provided to surround the vertical rod, one end of the insulator is disposed inside the first conductor, the other end of the insulator is disposed outside the first conductor to electrically separate the second conductor and the first conductor, and a coupling groove, to which the horizontal rod is fitted, is provided at the end of the insulator, which is disposed in the first conductor, so that a coupled state between the first conductor and the second conductor remains constantly.

### Claim 2 (depends on 1)

The system of claim 1, further comprising:
an anti-arcing member provided to cover one of the two ends of the insulator which is disposed inside the first conductor,
wherein the anti-arcing member is joined to the horizontal rod and made of a material having resistance to corrosion (erosion) caused by electric discharge.

### Claim 3 (depends on 1)

The system of claim 1, wherein the emitter is positioned at a center inside the first conductor, and the horizontal rod extends in a direction from the vertical rod toward an upstream of the gas stream.

### Claim 4 (depends on 1)

The system of claim 1, wherein the insulator is shaped such that a horizontal cross-sectional area is decreased in the first conductor in a direction from a wall surface of the first conductor toward the horizontal rod.

### Claim 5 (depends on 1)

The system of claim 1, wherein negative power is applied to the second conductor.

### Claim 6 (depends on 1)

The system of claim 1, wherein the direct current voltage applied to the second conductor is −30 kV to −80 kV.

### Claim 7 (depends on 1)

The system of claim 1, wherein multiple second conductors are disposed in a longitudinal direction of the first conductor, each electrically insulated from the first conductor, and each have an emitter configured to produce non-thermal plasma (NTP).