DE2130244A1 - Device for drying and overheating of intermediate pressure steam by high pressure steam - Google Patents

Description

Device for drying and overheating of intermediate pressure steam High pressure steam The invention relates to a device for drying and superheating of wet intermediate pressure steam through high pressure steam in a turbine system, whereby a water separator and a superheater tube bundle housed in a pressure vessel are.

The water separators of such known devices (British patent 931.235) can the intermediate pressure steam before entering the superheater tube bundle not dry completely Therefore, the residual water of the intermediate pressure steam intermediate-pressure saturated steam can be generated by part of the high-pressure steam. These Steam conversion consumes a greater amount of high-pressure steam than pure superheating. This has the disadvantage that the high-pressure part of the turbine is used for steam conversion is withdrawn who would otherwise do work It is known to steam that for the regenerative feed water preheating of a power plant or which is required for heating purposes will be able to tap into certain working pressure points of turbines. This will make the The required heating steam in the turbine is expanded to the required pressure and performs additional work.

The invention is based on the object described above Facility to take advantage of the steam tap.

The object is achieved according to the invention in that the superheater tube bundle is subdivided on the heating steam side and that the first in the direction of flow of the water steam Part of the tube bundle is heated by bleed steam from the high-pressure turbine stage. This means that extraction steam is used to evaporate the residual water, which is in the high-pressure section has been relaxed during the work process until it is close to the intermediate pressure. From the low pressure difference between the condensing bleed steam and the intermediate pressure steam there is a slight temperature difference between the tube bundle part and the adjacent residual water.

The small temperature difference is enough to deal with a small Heating surface part to evaporate the remaining water part because the heat transfer coefficient in Wet steam condition is very large.

The small temperature difference between the one heated with tap steam Tube bundle part and the still wet intermediate pressure steam has the advantage that water droplets, which always detach themselves from steam-coated surfaces from the same places and are carried away do not cause any damage to the pipe material through thermal shock effects can.

The complete drying of the intermediate pressure steam in the one with bleed steam heated tube bundle part causes the tube bundle part heated by high pressure steam is shielded from entrained water droplets from the water separator and that no new water droplets can form between the two tube bundle parts. This reliably prevents water droplets from becoming heated with high-pressure steam Get tube bundle part. This has the advantage that the material is destroyed by Thermal check effect on the hot tubes of this tube bundle part is avoided, which experience has shown otherwise occurs here.

Due to the complete drying of the intermediate pressure steam according to the invention the drying is economical because the heating bleed steam is only from one turbine wheel stage must be transferred to the same again as reformed steam from the evaporated residual water to participate in the working process in the turbine.

The intermediate pressure steam can be used for optimal use of the steam tap the overheating part of the tube bundle must be subdivided in the same way on the heating steam side, so that in the direction of flow of the dried intermediate pressure steam in each case the first Part of the tube bundle is heated by bleed steam from the high-pressure turbine stage.

An embodiment of the invention is shown in the drawing and is described in more detail below. They show: FIG. 1 a device for Drying and overheating of wet intermediate pressure steam from a turbine system High pressure steam in the longitudinal section; Fig. 2 shows a cross section according to the cutting line A-A of Figure 1.

In a container 1 is both a water separator 2 and a Housed superheater tube bundle, which is in the tube bundle part 3 and the tube bundle part 3 'is divided. High-pressure steam is supplied to the tube bundle part 3 through the nozzle 4 forwarded.

The high-pressure steam condenses through the release of heat in the tube bundle part 3. It leaves the part of the tube bundle as condensate through the pipe socket 5. On the steam side separated from the tube bundle part 3 is the tube bundle part 3 'bleed steam of the high-pressure turbine (not shown) fed through the pipe socket 6. The bleed steam condenses by heat dissipation in the tube bundle part 3 ', which it acts as condensate through the pipe socket 7 leaves. From the pipe socket 5, the condensate is through a not shown Condensation drain removed. From the pipe socket 7, the condensate is through discharged a second condensate drain, not shown.

The wet intermediate pressure steam enters the device through the nozzle 8 and leaves it overheated through the nozzle 8 '.

It flows through the separator 2 from bottom to top. The separator 2 is designed as a known centrifugal separator in this example. A separator of other known types can also be used.

In the flow direction 9 of the still carrying a residual proportion of water Intermediate steam is the first tube bundle part 3 'by bleeding steam of the high-pressure turbine stage heated. The tube bundle part 3 'is only a little. hotter than the intermediate pressure steam. Therefore, the residual water content evaporates appreciably without the intermediate pressure steam overheat. Only a small pressure gradient is used for this steam conversion.

FIG. 2 shows that said stream of intermediate pressure steam the Hohrbündelteil 3 'acted upon, so that the intermediate pressure steam the Tube bundle part 3 flows dry.

The intermediate pressure steam is in the tube bundle part 3 by high pressure steam overheated. The tube bundle part 3 is secured against danger from water droplets.

Claims (1)

PATENT CLAIM Device for drying and superheating of wet intermediate pressure steam a turbine system by high pressure steam, whereby a water separator and a superheater tube bundle are housed in a pressure vessel, thereby g e k e n n n e i c h n e t that the superheater tube bundle (3, 3 ') is divided on the heating steam side and that in Direction of flow of the wet and / or dried intermediate pressure steam is the first Part (3 ') of the tube bundle is heated by bleed steam from the high-pressure turbine stage.