Fluid sprinkling – spraying – and diffusing – Unitary plural outlet means – And flow regulation or control of outlets
Patent
1995-09-12
1997-12-02
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Unitary plural outlet means
And flow regulation or control of outlets
239584, 251122, 261 71, 261DIG13, 261DIG38, A62C 3720
Patent
active
056926847
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Field of the Invention
The invention relates to a spray cooler for regulating the temperature of superheated steam. The spary cooler has a housing consisting of a housing head with a water inlet opening and a nozzle insertion pipe, and a nozzle head disposed at the end of the nozzle insertion pipe into the walls of which nozzles have been placed axially one behind the other. An axially movable piston rod with a regulating piston on the nozzle end which controls the nozzles as a function of its position for unblocking or blocking the flow-through of cooling water is disposed inside the housing in a hollow-cylindrical cooling water line arranged between the water inlet opening and the nozzles. In in a closed position the regulating piston completely seals the nozzle head at the inlet side and in an open position unblocks all nozzles.
2. Prior Art
Spray coolers of the above mentioned type are known and are often used for temperature regulation of superheated steam, for example in power plants.
A spray cooler of the above described type is described in a pamphlet of Company!, Erich Mullerstr. 22-24, 4000 Dusseldorf 13, Pamphlet No.: VN-A.T.-Temp-9002/08. The known spray cooler cools superheated steam contained in a boiler or flowing in a steam line by injecting water which has been atomized by the nozzles. The continuous amount of the cooling medium injected into the boiler or the steam line can be preset by a stroke setting of the regulating piston, wherein one or several of the nozzles are unblocked or blocked and the steam temperature of the released steam can be controlled in this way.
The stroke position of the regulating piston can be adjusted manually or can be controlled or regulated hydraulically or by an electric motor, in which case a temperature sensor introduced into the steam line transmits appropriate signals to a microprocessor controlling the stroke movements.
The known spray coolers have the disadvantage that often the nozzles are exposed to a very high feed pressure of the cooling water provided and are relatively rapidly worn or destroyed by this.
Pressure water lines under an operating pressure of more than 100 bar are often provided at the place where they are used. The known spray coolers are used with a water pressure of sometimes more than 100 bar and the counterpressure of the steam to be cooled often is considerably less, so that almost the entire force of the water pressure is applied to the respectively open nozzles. The nozzles are being destroyed relatively rapidly by erosion as a result of the flow speed. This causes, in addition to increased repair and replacement part costs, short maintenance intervals which increase the costs.
OBJECT AND SUMMARY OF THE INVENTION
It is the object of the invention to improve the spray cooler mentioned at the outset in such a way that an approximately even water pressure is provided independently of the respective amount of cooling water supplied which, on the one hand, assures sufficient atomization and, on the other, does not destroy the nozzles.
The object is attained in accordance with the invention in that at least one coaxial throttle area with an axially continuously widening throttle cross section is disposed on the piston rod between the water inlet opening and the nozzles, which is closed in the blocking position of the piston rod and which releases a largest possible ring-shaped throttle cross section in the open position.
The spray cooler in accordance with the invention advantageously utilizes the stroke travel of the regulating piston preset by the control of the nozzle sealing by means of the control pistons for achieving a pre-sealing of the cooling water line and a pressure pre-reduction at the respectively unblocked nozzles.
In the closed position of the regulating piston, the pre-sealing throttle body, which usually is a throttle cone, blocks the cooling water line in addition to the control pistons which block the water exit openings of the nozzles.
In accordance with the position
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patent: 5380470 (1995-01-01), Jacobsson
patent: 5439619 (1995-08-01), Kuffer
Douglas Lisa Ann
Holter Regelarmaturen GmbH & Co. Kg
Kashnikow Andres
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