SU1719860A1 - Multistage steam ejector - Google Patents

Abstract

Usage: heat in steam turbine installations of thermal power plants. The goal is to increase efficiency. SUMMARY OF THE INVENTION: A multi-stage steam ejector comprises a bottom end wall 1, working nozzles 2, a branch pipe 3 of the steam-air mixture inlet, diffusers 4, the output edge of which is made with gear notches 5, a tubular heat exchanger 6, windows 7 of the steam-air mixture transition from one stage to another, vertical a wall 8 at the windows 7 to prevent unorganized condensate overflow, a pipeline 9 for draining condensate from the stages and a pipe 10 for the release of PVA into the atmosphere. The outlet edge 11 of the diffusers 4 is made with serrated cutouts. The working steam, the passage of the nozzle 2, carries the vapor-air mixture, which is cooled in the heat exchanger 6. goes down and is removed through the nozzle 10. The condensate is retained by means of the vertical wall 8, is removed through the pipeline 9 plum. Such a movement of the mixture reduces the resistance and consumption of the working steam. 1 hp f-ly. 1 il. sl C

Description

The invention relates to a power system and can be used in steam turbine installations of thermal power plants.

The aim of the invention is to improve the efficiency of the ejector by reducing losses during the movement of the steam-air mixture (PVA) and reducing the consumption of working steam.

The drawing shows a schematic diagram of the ejector. The ejector has a bottom end wall 1. working nozzles 2, a branch pipe 3 of the PVA inlet, diffusers 4. whose output edge is made with notched notches 5, a tubular heat exchanger 6, PVA 7 windows from one stage to another, a vertical wall 8 near the windows to prevent unorganized condensate overflow, pipeline 9 for draining condensate from the stages and pipe 10 for the release of PVA into the atmosphere. The outlet edge 11 of the diffusers 4 is made with notched cuts 12.

Multistage steam ejector operates as follows.

The working steam, the passage of the nozzle 2, carries away the PVA, which is pushed into the diffuser 4. At the exit of it, the PVA gradually loses its velocity. After cooling and descending, the PVA reaches the windows 7 and, if it is the third stage, goes to the atmosphere through the pipe 10, and the resulting condensate is kept from draining into the windows 7 by means of the vertical wall 8. Then this condensate is removed through the drain pipe 9 known scheme.

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The increase in the efficiency of such an ejector occurs due to a decrease in the flow of working steam to the nozzles and losses associated with the possibility of less often recirculating the main condensate.

Claims (2)

Claim 1, Multistep steam ejector, containing a housing mounted on the lower end wall, in which there are steps divided in vertical chambers separated by vertical walls, each of which has a tube bundle fixed in the main and intermediate tube plates, and a diffuser, at the entrance of which is installed a working the nozzle, while the cooling chamber of the previous stage is communicated bypass windows with the camera the suction of the next stage, and a steam-air outlet pipe, which is characterized by the fact that, in order to increase efficiency, the ejector is equipped with additional vertical walls mounted on the lower end wall and located in the cooling chambers on the side of the bypass windows between the diffuser and the vertical wall, and the working nozzles are placed under the bottom end wall, while the latter has the bypass windows and the outlet pipe is connected between end wall and bottom intermediate board. 2. The ejector according to claim 1, characterized in that the exit edge of the diffuser is made with serrated cuts. Ya8S