DE1750803C - Pressure reducing and desuperheating valve - Google Patents

Description

In contrast, the invention provides task 65 to the outside by means of a stuffing box 6. The external basis a valve of the type mentioned at the beginning so re end of the spindle 5 is to be designed on a not shown Betäauszuestalten, that connected to a pressure injection control unit, which is controlled by signals from can be drawn. At the same time, a steam pressure control element is to be controlled. the

(f-

Signals can be hydraulic, pneumatic or electrical inlet with essentially the same pressure tric or other suitable type. that the pressure-relieved, relaxed uampi

The actual valve 7 is provided on the spindle 5. It is therefore not injected into the steam, which is a profiled one with a single one but is instead provided by the throttle element 8 provided between the aem & uz seat surface and an outlet ring 12 and the Throttle device ⁸ . ^h eg ^"fl ^ s giormigleichskolben9 gene of substantially the same throughput passage at high speed" ttomenaen diameter as the seating surface of the throttle member 8 taken up steam. The effect is evident. This ensures that the through the usual injector. The incoming water wiraι ois inlet 2 entering high pressure steam on the lower to a certain extent by touching nut _aem side of the throttle body 8 and heated on the top of the io seat ring 12 and the component 14, una inioige Kolbeas 9 acts, whereby the pressure effect ge - compensates for the high speed of the steam on the other side. The low-pressure steam acts on point is the heat transfer coefficient ™ Βθκη the upper side of the throttle element 8 and above a steam and water also high, whereby through the middle of the throttle element and the piston rapid heat absorption of the water ββ extending axial bore 10 and via au the sub-15 steam becomes possible. In connection with the side of the piston arranged radial bores 11 of high steam speed are located sicn, aa ocr on the underside of the piston 9. The pressure forces of steam behind the throttle element 8 expand, emc on the valve are, apart from the slight zone 13 of high turbulence, and this requires considerable, due to the width of the throttle body and the distance traveled by the water droplets through the spindle at its point of passage through ao, which means that the droplets are sufficient for the imbalance caused by the stuffing box and are further heated inaccurately ten balanced. Reason of the turbulence to reduce their size quickly

The profiled throttle member 8 works with one like. It is of course aware that for ever, uic änderlichen a D "tunmfesten seat ring 12 together to te between the inlet water flow, heat transfer ™ ^scne n laß2 and Auslaß3 a vapor permeability comparable" is s steam and water so great, kid Cross-section for those with a large drop size of water. To create all “not uncomfortable flowing steam”. Behind bar absorbed by the water vapor ™ ° the mu Drosselorgan8, the steam in one of gendwo in the turbulent zone m _r ^ ^we ° f. ™ "" to a cup-shaped turbulence zone 13 welded to the seat ring 12 after absorption of sufficient heat evaporative component 14 to expand. 30 and then tuned off with the steam flow. Between the seat ring 12 and the cup-shaped valve shown reduces this and

Component 14 is a piece of equipment connected with the water inlet 4 for a uamptaru ^CK ^ "- ne annular chamber 15, which essentially becomes a coaxial decorative and desuperheating station, ° ^eso ° f ^ *? ^Η " with the throttle element and the seat ring 12 Arranged high pressure and temperature reduction leads between the annular passage 16, which is required at the inlet steam and exhaust steam. Db , the rear end of the flow path of the high til can be made in a variety of sizes ^^ who

Df d il d bi in a large number ™ ^te £ ^cme ™ ^er ™

rear end of the flow path of the high til can in ^^

Speed of the flowing steam and immediate, in order to with a large number ™ ^te £ ^cme ™ ^er ™

bar is arranged in front of the turbulent zone 13. working conditions to be employed ^ - It has _n «cn

The amount of water supplied to the valve is controlled by a cooling water control valve (not shown), steam flow or in E ^ ¹ J = J ¹ J ₁

which proved to be appealing by a temperature monitor, so that_over the whole

its temperature pulse at one behind the setting range shown, which amounts to about 50 ^ l απ from ^

The outlet steam pressure and the temperature are continuously very high

generated signal is adjusted. The water enters in exactly can be sustained.

1 sheet of drawings

Claims (2)

1 2 that the cooling water supplied to the valve: evaporates completely and thus an optimal cooling effect is achieved. 1. Pressure reducing and desuperheating valve, in which this object is achieved according to the invention In order to create a variable steam passage, the water inlet device acts at the end of the throttle zone, which already has a considerable throttle element and a solid component, at the end of the throttle zone, which leads to the rear end of the throttle zone through a throttle zone through a throttle zone, which already has a considerable throttle element and a solid component, and in which a water feed line is provided and the steam flow through which leads to a throttle zone arranged around the throttle zone, essentially vertically upwards to the water inlet device, via which the cooling water runs _to the point at which the water is fed to the steam generator and at which a turbulent flow is mixed in and at this point immediately -Expansionszone is provided, thereby passing into the turbulent expansion zone, in denotes that the water inlet devices already considerably relaxed the water droplets during their heating (15, 16) on the one behind in the direction of steam flow and evaporation in the steam Dam pf 15 th. By introducing the water at the leading end of the throttle zone a point of turbulent flow and low pressure is provided, and that the steam flow through the throttle zone pressure behind the throttle zone, a cooling water essentially vertically up to the injection pump is possibly superfluous because the point (16) runs, in which the water is mixed with the water absorption in the steam by a kind of injector steam flow and ao effect takes place at this point. The complete evaporation of the water droplets introduced into the steam directly into the turbulent expansion zone is ensured by the fact that the water droplets are ensured during heating by guiding the steam flow from below and evaporation in the steam upwards. As long as the water droplets are kept floating. Chen have a noticeable size, they will be through 2. Valve according to claim 1, characterized in that a ₅ the force of gravity counteracting flow guides that the water inlet device held a tion of the steam in suspension. Only ring arranged around the throttle zone when the droplets have become so small, they have chamber (15) and are arranged in a coaxial manner with the throttle element (8) and the throttle zone so that the force of gravity no longer acts on them against the flow of steam in suspension th annular passage (16) expires. 30, they are taken into the steam stream men. But then they are already almost completely evaporated or will be in the next eye view evaporates, so that the undesired separation of water in the low-pressure side line sy-35 stem is definitely avoided, even if the The invention relates to a pressure reducing and steam flow is no longer guided vertically. Desuperheating valve, in which to create a changeable At the same time it is achieved that with minilichen Steam passage cross-section through a drosmal cooling water volume maximum steam cooling zone a throttle element with a solid component is achieved because the water evaporates completely cooperates and in which a water feed line 40 is. to a valve arranged around the throttle zone. Water inlet device leads, via the cooling water system steam flow and cooling water injection into the is supplied, and in which a turbulent expansion throttle zone known design of the water injection zone is provided. Valves of this type are used letting device, the one around the throttle zone for relaxation and simultaneous cooling of 45 arranged annular chamber and in a co-superheated Steam by feeding in cooling water axially to the throttle element and the throttle zone in the superheated steam. Neten annular passage runs out, can also So far, the cooling water was advantageously mixed up with the superheated steam in the valve according to the invention or in the area of the throttle zone, where it is necessary to precool the superheated steam at a considerable pressure, 50 throttle zone or preheating of the cooling water and the injection pumps for the cooling water an even introduction of cooling water into the power, which is achieved above the superheated steam flow at the injection point,
prevailing vapor pressure lying injection pressure The invention is described below with reference to the need to generate. In a known valve of this drawing, which is a partial section of a preferred In this way, the steam flows through the throttle section 55. Embodiment of the valve according to the invention from top to bottom, showing the complete evaporation. The valve shown is designed for installation in the striving for a stretch of relaxation impact showed a determined vertical position and instructs will. In such a valve, the cooling water housing 1 must be provided with a flange Hochin an area to be injected, the pressure of which is 60 pressurized steam inlet 2, one with a flange significantly above the pressure of the relaxed henen outlet 3 for the pressure-reduced and entDampfes to ensure that the expanded steam and a flanged joint to a complete evaporation of the cooling water inlet 4. A valve spindle 5 water leads. extends axially through the housing 1 and occurs