Method of locating underground mines fires

• US 5,121,344 A
• Filed: 02/21/1991
• Issued: 06/09/1992
• Est. Priority Date: 07/03/1989
• Status: Expired due to Fees

• Current Assignee: The United States of America as represented by the Secretary of the Interior
• Original Assignee: The United States of America as represented by the Secretary of the Interior
• Inventors: Pomroy, William, Laage, Linneas
• Primary Examiner(s): Lall, Parshotam S.
• Assistant Examiner(s): ZANELLI, MICHAEL J
• Application Number:
  US07/657,627
• Time in Patent Office: 474 Days
• Field of Search: 364/550, 364/551.01, 364/578, 364/513, 364/580, 364/900, 364/557, 340/506, 340/577, 340/870.06, 340/870.09, 340/870.16, 340/870.17
• US Class Current: 702/33
• CPC Class Codes: G08B 17/00 Fire alarms; Alarms responsive to explosion
• CPC Class Codes: G08B 25/00 Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
• CPC Class Codes: G08B 26/002 only replying the state of the sensor

Abstract

An improved method of locating an underground mine fire by comparing the pattern of measured combustion product arrival times at detector locations with a real time computer-generated array of simulated patterns. A number of electronic fire detection devices are linked thru telemetry to a control station on the surface. The mine'"'"'s ventilation is modeled on a digital computer using network analysis software. The time reguired to locate a fire consists of the time required to model the mines'"'"' ventilation, generate the arrival time array, scan the array, and to match measured arrival time patterns to the simulated patterns.

Claims

1. A method of locating underground mine fires comprising the steps of:

(a) installing a plurality of electronic fire detection devices in a mine'"'"'s workings in a predetermined pattern;

(b) creating and storing a real time generated array representing fire location, detector location, and contaminant arrival time in a computer;

(c) linking said fire detection devices to said computer thru telemetry devices and

(d) comparing incoming detector signals generated by said detection devices with said real time generated array whereby each fire location can be associated with a unique and recognizable pattern of combustion product arrival times (CPAT) at said detector locations.

2. The method of claim 1 wherein said predetermined pattern is determined through an iterative process including the steps of selecting tentative locations for detection devices and calculating CPAT for possible fire locations to determine if each location has a unique CPAT for all possible fire locations.

3. The method of claim 1 wherein said real time generated array is created through artificial intelligence techniques to analyze the location containing the fire.

4. The method of claim 1 wherein said combustion product arrival times can be determined by relating measured contaminant levels and known dilution factors to basic combustion phenomena.

5. A method for determining the location of a fire in a complex network of mine workings using distributed fire detectors and measured contaminant histories, comprising the steps of:

installing a plurality of electronic fire detection devices in a mine'"'"'s workings in a predetermined pattern, said pattern being determined through an iterative process including the steps of;

selecting tentative locations for detection devices, and

calculating Combustion Product Arrival Times (CPAT) for possible fire locations to determine if each location has a unique CPAT for all possible fire locations;

creating and storing a real time generated array representing fire location, detector location, and contaminant arrival time in a computer;

linking said fire detection devices to said computer through telemetry device, and

comparing incoming detector signals generated by said detection devices with said real time generated array whereby each fire location can be associated with a unique and recognizable pattern of combustion product arrival times at said detector locations.