System for temperature profile measurement in large furnances and kilns and method therefor
OwnerParthasarathy Shakkottai, Shakkottai P. Venkateshaninventors
Life of this patent
Estimating the term…
Abstract
Measurements of the times of flight of sound waves can be used to determine temperature in a gas contained in a long tube which confines sound waves. Sound pulses are transmitted and received by a suitable loud speaker attached to one end of the long tube. A number of stubs or other discontinuities produce the sound reflections whose times of arrival are measured. The time intervals yield average sound speeds in each interval between any two stubs from which temperatures are calculated. Corrections for thermal expansion of the tube are easily made.
Claims11
A system and method for deriving data indicative of temperature variations in hot fluids in large chambers, kilns, process vessels and the like comprising a long, resistant, heat conducting sensor tube containing a chosen gas which serves to transfer the temperature profile in the hot fluid just outside said tube to said gas inside said sensor tube;
- said tube containing a chosen number of stubs or other reflecting means inside said sensor tube which serve to partially reflect sound pulses that are used to probe said temperature profile that has been transferred into said sensor tube;
- a transmitting and receiving means for generating and detecting said sound pulses and their multiple reflections which propagate inside said sensor tube;
- a means for measuring the time intervals between said various pulses in the train of said multiple reflections from said reflecting means inside said sensor tube;
- and output means for calculating, tabulating, and displaying said temperature profile and generating useful control signals to utilize said calculated temperature profile in said combustion chamber, kiln, or process vessel.
A system for processing signals and deriving temperature distribution in large combustion chambers, the arrangement comprising:
- a corrosion and high temperature resistant sensor tube suitable for the temperature range of interest containing a number of reflecting means at chosen locations inside said sensor tube;
- a transmitting-receiving means mounted at the cold end of said sensor tube;
- a pulse generating means to drive said transmitting-receiving means in a controlled manner;
- an amplifying means to detect multiple pulses of sound reflected by said reflecting means;
- a diode to isolate reflected signals produced in said receiving means by said reflected sound pulses from short circuiting by said pulse generator or its output-amplifier and also prevent unwanted oscillations from said output amplifier;
- means for detecting various time differences between said multiple pulses produced by said number of reflecting means in said sensor tube;
- output means for calculating and displaying said temperature profile from said measured time intervals.
Dependencies are inferred from the claim text.