2 edition of Forced-flow once-through boilers found in the catalog.
Forced-flow once-through boilers
James R. Stone
1975 by Scientific and Technical Information Office, National Aeronautics and Space Administration, for sale by the National Technical Information Service in Washington, Springfield, Va .
Written in English
Bibliography: p. 115-137.
|Statement||James R. Stone, Vernon H. Gray, and Orlando A. Gutierrez, Lewis Research Center.|
|Series||NASA SP -- 369|
|Contributions||Gray, Vernon H., 1917-1975., Gutierrez, Orlando A., Lewis Research Center.|
|LC Classifications||TL900 .S76|
|The Physical Object|
|Pagination||vii, 137 p. :|
|Number of Pages||137|
As is shown in FIG. Energetics No. Multiphase Flow, 6 4— The water exits through a check valve into an outlet manifold and then into the boiler tube inlet
Description: The present invention relates to a method of operating a forced-circulation boiler, especially for a steam turbine, said boiler comprising at least a first heat exchanger, the inlet of which is connected to a water feed line and the outlet of which is connected, via a regulated valve, either to the inlet of a second heat exchanger, the outlet of which is connected to the steam turbine, or directly to the steam turbine. This is a preview of subscription content, log in to check access. These and other disadvantages of the prior art feedwater control systems for forced-flow boilers have been overcome by the present invention. The method of supplying feedwater to a forced flow boiler wherein the flow of fuel to a burner is controlled in a continuous manner in accordance with the quantity of steam desired and wherein a positive displacement pump having a plurality of discrete pumping elements is connected between the boiler and a source of feedwater, the pump having means associated with each pumping element for selectively disabling the pumping action of said element, comprising: a determining the water flow rate required by the boiler; b operating the feedwater pump to supply water to the boiler; and c disabling at least one of the pumping elements on a periodic basis with a variable duty cycle, the duty cycle bearing a relationship to the demand for water. The liquid phase water is drained off to a condenser and the vapor phase is drained off by means of three pressure regulators and controllers either to a deaerator or via a heat exchanger to this deaerator or else to a condenser before returning to the inlet of the economizer of the boiler.
In: Proceedings of the 3rd int. Bhatt, B. Nuclear Energy, 5, Disabling means are associated with each pumping element for selectively defeating the pumping action of the associated pumping element. It is then possible to produce steam at very high pressure, including at the supercritical pressure. The embodiment shown herein uses an evaporator with at least two sections operating at the same pressure, one being a natural circulation section, and another being a pump assisted, once-through section.
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While the embodiment described herein uses water as the working fluid and therefore is generating steam, it is understood that a different working fluid could be used, in which case there would be liquid and vapor phases of that working fluid in the system in the place of the water and steam described here.
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In this type of power station, a fuel, for example natural gas or fuel oil, is burnt in a gas turbine which drives an electricity generator. In: Proceedings of the 5th int heat transfer conference, Vol 4, 3.
The bypass valve connects the port 98 and hydraulic chamber 96 with the crankcase 69 through a passageway RT The analysis of nonlinear density-wave oscillations in boiling channel. Delhaye, M. Drizius, M. Controlling the rate at which feedwater is provided to such boilers is difficult because of the high pressure and often high temperatures where condensation from a steam separator is returned to the pump inlet at which the water must be supplied.
The hydraulic chamber 96 is connected to the bottom of the cylinder 62 via a port 98, as is shown in FIG. The boiler is not able to produce super-critical pressures because the steam generation is not dependent on pressure differences .
Celov, I. Have more questions about boilers?
This detection is used to gradually open the valve 30 in order to divert the steam 30 [sic] to the superheater 12 and to gradually close the valve 40 and the expansion valve The end-result Hutchinson and SBMC are pleased with the performance of their new boilers and the savings they are achieving— savings they expect to increase when boilers in the older section of the medical center are turned off for good.
The combination as defined in claim 8 wherein the duty cycle of the valve in the fourth bypass means is less than one minute. Both of these sectionshave the same outlet pressure. Unlike the downcomer 13 in FIG.
The effects of heat flux variations, inlet subcoo1ing, flow rate, inlet and exit restrictions are indicated. Such boilers are used in cases where there is high pressureabove 30 Mega Pascal.
One proposed solution is a once-through boiler with a horizontal mode of construction and vertical heated tubes, as described in U. It is then possible to produce steam at very high pressure, including at the supercritical pressure.
Thereafter, the capacity Forced-flow once-through boilers book the gas turbine may be increased. Google Scholar 2. The final temperature of the steam leaving the boiler will be as required for the rated speed, or it may be controlled by an optional additional desuperheater for partial loads or peak loads.
The water is drained from the separator to a condenser or other reservoir, while the steam passes through the second part of the exchanger before being superheated. Google Scholar 4.As the leading provider of educational meetings, seminars and workshops, RSES also provides technical examination programs and training courses for service professionals working on heating, ventilation, air conditioning and refrigeration systems across the nation.
Visit RSES at sylvaindez.com to learn more about how RSES can help you or your organization grow. Jul 07, · KATZ, Gulf General Atomic, California I have a number of questions concerning the empirical equation proposed by the authors of Paper 1^ to.
Apr 03, · MIURA's EX Gas/Oil Series High Pressure Steam Boiler features a "low water content watertube" design. The EX Series is a once-through, forced circulation steam boiler producing steam in just five minutes, while maintaining an 85% fule-to-steam efficiency.
The unit's design consists of rows of vertical tubes sandwiched between two annular headers. F22B35/10 — Control systems for steam boilers for steam boilers of forced-flow type of once-through type. F The references to the book by U. S. Reznikov and Yu. M. Lipov, as well as to the least heated tube modules of conventional HRSGs with natural circulation, are incorporated herein for the purposes of describing the background of this Cited by: McDonald and Johnson  have indicated that the laboratory version of the B & W Once-Through Steam Generator was subject to oscillations under certain combinations of operating conditions.
The observed periods of sec suggest density wave instability. It was found that flow re- sistance in the feedwater heating chamber stabilized the sylvaindez.com by: The subsequent tendency was to structure surfaces to improve the nucleate boiling characteristics by a fundamental change in the boiling process [Webb ()].
Many of these advanced surfaces are being used in commercial shell-and-tube boilers. A book on the subject was prepared by Thome ().