PL185019B1 - Reaction-type steam turbine - Google Patents

Abstract

Reaction steam turbine, single-hull, characterized in that in place The diaphragm is inserted into the steering rim (6) that divides the flow channel turbines in two parts, and on both sides the shutters (6) on the circumference of the fuselage (1) are made there are openings (5) connecting the flow channel turbines placed outside the hull (1) with annular chambers pressure relief - outlet chamber (7) and an inlet chamber (8), the chamber being the outlet (7) is a pipeline a bleed (9) which is connected to the chamber inlet (8) by bypass (11) with the regulating valve (12).

Description

The subject of the invention is a single-frame reaction steam turbine with adjustable steam discharge.

The hitherto known reaction, single-frame, backpressure or condensation steam turbines differ to a large extent from bleed-back or bleed-condensation turbines. Due to the relatively low height of the blades and the large diameter of the rotor compared to action turbines, the use of a controlled bleed in reaction turbines requires a special hull design, a dedicated chamber and complex regulating elements such as casing valves etc. Consequently, in case of demand for extractor steam, e.g. for heating purposes, it was necessary to replace the existing backpressure or condensing reaction turbine with a bleed-back or a bleed-condensing turbine. In a reaction, single-frame, back-pressure or condensation steam turbine, according to the invention, the place of the steering rim is provided with a shutter which divides the flow channel of the turbine into two parts. On both sides of the barrier, on the circumference of the hull, openings are made, connecting the flow channel with the annular relief chambers located outside the hull - the outlet chamber and the inlet chamber. A relief pipeline is led out of the outlet chamber and connected to the inlet chamber by a bypass pipeline with a control valve.

In this way, a back-pressure or condensing reaction turbine, if necessary, can work as a bleed-back or bleed-condensing turbine with an adjustable bleed. The position of the shutter along the length of the turbine flow channel depends on the bleed vapor pressure to be achieved. A bypass control valve between the outlet chamber and the inlet chamber serves to regulate the steam flow from the turbine portion upstream of the shutter to the downstream portion. It is thus possible to control the steam pressure in the bleed.

The subject of the invention in an exemplary embodiment is presented in the drawing which shows the axial section of a single-frame, backpressure reactive steam turbine with an installed adjustable steam exhaust. The steam reaction turbine has a fuselage 1 with guide rings 2 and a rotor 3 with rotating rings 4. In the flow channel of hull 1, two guide rings and two rotating rings are removed, and two rows of holes 5 are made around the circumference of the fuselage 1. A shutter 6 is inserted through openings 5. Outside the turbine casing 1 there are annular bleeding chambers - outlet chamber 7 and inlet chamber 8, connected by openings 5 with the turbine flow channel. A relief pipeline 9 with a shut-off valve 1θ leads from the outlet chamber 7, and the outlet chamber 7 is connected to the bypass pipeline 11. A control valve 12 is installed on the bypass pipeline 11, which serves to regulate the steam flow from the turbine part upstream of the diaphragm 6 to the part behind. shutter 6 and thus regulating the vapor pressure in the bleed.

185 019

185 019

Publishing Department of the UP RP. Circulation of 50 copies. Price PLN 2.00.

Claims (1)

Patent claim Reaction steam turbine, single-frame, characterized in that a shutter (6) is inserted in place of the steering ring, which divides the turbine flow channel into two parts, and holes (5) are made on both sides of the shutter (6) on the circumference of the body (1) , connecting the turbine flow channel with the annular relief chambers located outside the casing (1) - the outlet chamber (7) and the inlet chamber (8), while the discharge pipeline (9) runs from the outlet chamber (7) and is connected to the chamber the inlet (8) by the bypass pipe (11) with the regulating valve (12).