# US 5,344,628 A · Method for introducing and metering a liquid treatment medium in combustion processes

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- Number: US 5,344,628 A
- Document ID: US5344628A
- Status: Granted
- Kind: A
- Application number: 08/061,370
- Filed: 1993-05-13
- Granted: 1994-09-06
- Earliest claimed: 1989-10-24
- Assignees: Martin GmbH fur Umwelt- und Energietechnik
- Inventors: Johannes J. E. Martin
- Web page: https://patentgrep.com/patent/US5344628A

## CPC

- F23J 7/00: Arrangement of devices for supplying chemicals to fire
- F23J 15/003: {for supplying chemicals to fumes, e.g. using injection devices}
- F23J: REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES (combustion apparatus for consuming smoke or fumes, e.g. exhaust gases, F23G7/06)

## Abstract

A method for introducing and metering a liquid treatment medium into the waste gas flow in combustion processes where the liquid treatment is metered and injected into a mixing chamber, under pressure. In addition, a carrier medium, also under pressure, is metered and injected into the same mixing chamber. This mixture is then sprayed, as a result of a pressure difference, from the mixing chamber, through a nozzle achieving atomization, and into the flue serving as an exhaust for the waste gas flow.

## Claims

### Claim 1

A method for introducing and metering the liquid treatment medium effective for reducing NO.sub.x into the waste gas flow in combustion processes for reducing the NO.sub.x content of the waste gas flow, comprising the steps of:
(1) pressurizing the liquid treatment medium at a first pressure;
(2) pressurizing a liquid carrier medium at a second pressure;
(3) delivering said liquid treatment medium and said liquid carrier medium in adjustable amounts to a mixing chamber to form a liquid mixture at a third pressure; and,
(4) spraying said liquid mixture into an area having a fourth pressure to contact the waste gas flow and reduce the NO.sub.x content;
wherein said liquid mixture is atomized solely by a single-component nozzle positioned to spray said liquid mixture into the area and said spraying step is effected when said third pressure exceeds said fourth pressure.

### Claim 2 (depends on 1)

The method of claim 1, wherein said first pressure is equal to said second pressure.

### Claim 3 (depends on 1)

The method of claim 1, wherein said mixing chamber has a maximum volume which is emptied by said spraying step in a few seconds.

### Claim 4 (depends on 1)

The method of claim 1, wherein said mixing chamber has a maximum volume which is emptied by said spraying step in no more than 30 seconds.