EP0278699A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method and apparatus for burning gaseous fuel, wherein fuel composition varies
Assignee: Hitachi Ltd
•
Filing: 1988-02-05
•
Granted: —
•
Expires: 2008-02-05
Abstract
Abstract A method and an apparatus are provided for burning gaseous fuel when the composition of the fuel varies at times. Main injection ports and sub-injection ports are arranged so that the fuel injected through the sub-injection ports is ignited by the flame formed from the fuel injected through the main injection ports. Fuel passages (22,23) are provided for conducting the gaseous fuel separately to the two groups of injection ports. A control valve (24) adjusts the ratio of the fuel flow to the main injection ports to the fuel flow to the sub-injection ports. In operation the proportion of the fuel to be injected through the main injection ports is increased as the rate of burning of the gaseous fuel increases.
Inventors
- 👤 Kazumi Iwai
- 👤 Akira Arai
- 👤 Hiromi Koizumi
- 👤 Katsuo Wada
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 23:13
CPC Classifications
F; F23; F23K; F23K5/00; F23K5/002; F23D; F23D14/00; F23D14/20; F23D14/22; F23D14/24; F23D17/00; F23D17/002
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
117 words
A method for burning gaseous fuel, the composi- tion of the fuel varying at times, wherein the fuel is divided into a main part and a sub-part, which are then injected through main injection ports and sub-injection ports, respectively, into a combustion chamber, in which the fuel injected through the sub-injection ports is burnt by a flame produced from the fuel injected through the main injection ports, said method being characterized in that the flow ratio of the main part to the sub-part is controlled so that the proportion of the fuel to be injected through the main injection ports may increase as the rate of gaseous fuel burning increases when the composition of gaseous fuel varies.
Claim 2
Independent Claim
117 words
A method for burning gaseous fuel, the composi- tion of the fuel varying at times, wherein the fuel is divided into a main part and a sub-part, which are then injected through main injection ports and sub-injection ports, respectively, into a combustion chamber, in which the fuel injected through the sub-injection ports is burnt by a flame produced from the fuel injected through the main injection ports, said method being characterized in that the flow ratio of the main part to the sub-part is controlled so that the proportion of the fuel to be injected through the main injection ports may increase as the rate of gaseous fuel burning increases when the composition of gaseous fuel varies.
Claim 3
Dependent Claim
54 words
The method for burning gaseous fuel of Claim 1, wherein the rate of gaseous fuel burning is determined indirectly from the proportion of inert gas volume in the gaseous fuel, and as this proportion of inert gas volume decreases, the proportion of the fuel to be injected through the main injection port is increased.
Claim 4
Dependent Claim
80 words
The method for burning gaseous fuel of Claim 1, wherein the rate of gaseous fuel burning, when the gaseous fuel supplied is coal gas from a gas producer, is determined by previous experiments on every species of coal to be fed to the gas producer, and at every change-over of the feed coal, the proportion of the fuel to be injected through the main injection ports is altered on the basis of the previously determined rates of gaseous fuel burning.
Claim 5
Independent Claim
149 words
An apparatus for burning gaseous fuel which comprises; main fuel injection ports formed in an end wall of a cylindrical combustion chamber; sub-injection ports arranged anularly outside the group of said main injection ports so as to surround the arrangement of said main injection ports; a fuel pass for conducting the gaseous fuel to said main injection ports and said sub-injection ports; a means of controlling the ratio of the fuel flow through said main injection ports to the fuel flow through said sub-injection ports; and a means of detection the rate of gas fuel burning; said two means being provided to said fuel pass; whereby said flow ratio controlling means is adjusted in response to a signal applied from said burning-rate detecting means so that the proportion of the fuel to be injected through said main injection ports may increase as the rate of gaseous fuel burning increases.
Claim 6
Independent Claim
149 words
An apparatus for burning gaseous fuel which comprises; main fuel injection ports formed in an end wall of a cylindrical combustion chamber; sub-injection ports arranged anularly outside the group of said main injection ports so as to surround the arrangement of said main injection ports; a fuel pass for conducting the gaseous fuel to said main injection ports and said sub-injection ports; a means of controlling the ratio of the fuel flow through said main injection ports to the fuel flow through said sub-injection ports; and a means of detection the rate of gas fuel burning; said two means being provided to said fuel pass; whereby said flow ratio controlling means is adjusted in response to a signal applied from said burning-rate detecting means so that the proportion of the fuel to be injected through said main injection ports may increase as the rate of gaseous fuel burning increases.
Claim 7
Dependent Claim
101 words
The apparatus for burning gaseous fuel of Claim 4, wherein said fuel pass is provided with a control valve for adjusting the whole flow of gaseous fuel to be fed to the combustion chamber, said fuel pass is divided downstream from said control valve into a main pass and a sub-pass which are in communication with said main injection ports and said sub-injection ports, respectively, and said flow ratio controlling means is a control valve for adjusting the flow ratio of the fuel to be injected through said main injection ports to the fuel to be injected through said sub-injection ports.
Claim 8
Dependent Claim
36 words
The apparatus for burning gaseous fuel of Claim 4, wherein said main injection ports are annularly disposed to form an arrangement of injection ports and a liquid fuel nozzle for ignition is provided inside said arrangement.
Claim 9
Dependent Claim
134 words
A gaseous fuel combustion apparatus for burning coal gas generated from a gas producer and feeding the high-temperature combustion product gas to a gas turbine, said apparatus comprising; main fuel injection ports formed in an end wall of a cylindrical combustion chamber; sub-injection ports for injecting fuel to such a site that the fuel injected thereby may be ignited by a flame formed from the fuel injected through said main injection ports; a fuel flow control valve for the purpose of conducting the gaseous fuel in amounts according to the load on said gas turbine from said gas producer; and a means of controlling the ratio of the fuel flow through said main injection ports to the fuel low through said sub-injection ports, said means being situated downstream from said fuel flow control valve.
Claim 10
Dependent Claim
134 words
A gaseous fuel combustion apparatus for burning coal gas generated from a gas producer and feeding the high-temperature combustion product gas to a gas turbine, said apparatus comprising; main fuel injection ports formed in an end wall of a cylindrical combustion chamber; sub-injection ports for injecting fuel to such a site that the fuel injected thereby may be ignited by a flame formed from the fuel injected through said main injection ports; a fuel flow control valve for the purpose of conducting the gaseous fuel in amounts according to the load on said gas turbine from said gas producer; and a means of controlling the ratio of the fuel flow through said main injection ports to the fuel low through said sub-injection ports, said means being situated downstream from said fuel flow control valve.
Claim 11
Dependent Claim
32 words
The gaseous fuel combustion apparatus of Claim 7, wherein said sub-injection ports are arranged in the end wall of the combustion chamber so as to surround the arrangement of main injection ports.
Claim 12
Independent Claim
111 words
An apparatus for burning gaseous fuel which comprises; main injection ports arranged annularly in the head end wall of a burner liner; a swirler for causing the fuel injected through said main injection ports to move spirally; sub-injection ports arranged annularly outside said annular arrangement of main injection ports; combustion air feed ports arranged annularly outside said annular arrangement of main injection ports; fuel passes provided separately for conducting the fuel to said main injection ports and said sub-injection ports; a flow controlling means provided to at least one of said fuel passes; and a means of regulating said flow controlling means according to the rate of burning said gaseous fuel.
Claim 13
Independent Claim
111 words
An apparatus for burning gaseous fuel which comprises; main injection ports arranged annularly in the head end wall of a burner liner; a swirler for causing the fuel injected through said main injection ports to move spirally; sub-injection ports arranged annularly outside said annular arrangement of main injection ports; combustion air feed ports arranged annularly outside said annular arrangement of main injection ports; fuel passes provided separately for conducting the fuel to said main injection ports and said sub-injection ports; a flow controlling means provided to at least one of said fuel passes; and a means of regulating said flow controlling means according to the rate of burning said gaseous fuel.
Claim 14
Dependent Claim
20 words
The apparatus of Claim 9, wherein said main injection ports and sub-injection ports are situated on nearly the same plane.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.