US 4,023,537 AGranted

Temperature control apparatus for a monotube boiler

OwnerJ. Warne Carter, Sr., J. Warne Carter, Jr.inventors

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Abstract

The temperature of a monotube boiler is controlled by apparatus that regulates the water flow only. Primary water is supplied to the inlet end of the boiler tube in accordance with the heat furnished to the boiler, and secondary water is injected into the boiler tube at a plurality of points spaced along the tube in accordance with the temperature of the steam as determined by a sensor located just upstream of the outlet end of the tube. One of the injection points, termed the feedback point, is located adjacent to and upstream from the temperature sensor. Feedback water injected at the feedback point has an immediate effect on the temperature sensor which is effective to maintain the steam at a substantially constant output temperature during steady state operation over a wide range in the heat furnished to the boiler, and during transient operation from one state to another caused by rapid and large changes in the heat furnished to the boiler.

Claims16

Dependent claims

Temperature control apparatus for a monotube steam-generating boiler having a tube with an inlet end for receiving primary water and an outlet end for providing superheated steam to a utilization device, and having heating means for providing heat to the boiler tube, said apparatus comprising:

a. heat control means for variably controlling the amount of heat provided by the heating means;
b. temperature sensing means for sensing the temperature of the steam generated in the boiler tube at a location adjacent the outlet end where the steam is superheated;
c. a plurality of input points located in the boiler tube upstream of the location of the temperature sensing means, one input point being adjacent to the temperature sensing means providing a feedback point;
d. primary water supply means responsive to the heat control means for supplying primary water to the inlet end of the boiler tube in accordance with the amount of heat provided by the heating means;
and
e. secondary water supply means responsive to the temperature sensing means for supplying secondary water to each of the input points in accordance with the sensed temperature of the steam and for causing the water supplied to each input point other than the feedback point to be proportional to the water supplied to the feedback input point.

3 more elements

Dependencies are inferred from the claim text.