SU1749614A1 - Injecting steam cooler - Google Patents

Abstract

Use: for operation in steam turbines. SUMMARY OF THE INVENTION: The injecting desuperheater comprises a housing (1) with a steam supply pipe (2), a mixing chamber (3), and a protective jacket (4). The mixing chamber (3) is installed in the housing with the formation of an annular gap (5). The chamber (3) of displacement is made in the form of a Venturi tube, in the confused part of which there is a water dispenser (6). Confusors (7) are installed in the cavity of the protective jacket (4), between which there is a ball-shaped separation element.

Description

The invention relates to a power system and can be used in steam turbine plants,

Known injection desuperheater, comprising a housing with a steam inlet pipe, and a mixing chamber mounted in the housing, made in the form of a venturi, and a protective jacket, and the latter has a perforated shell and a screw separator. To drain condensate at the bottom of the protective jacket, a branch pipe for drainage of WATER is installed. ’

A disadvantage of the known desuperheater is that. that it only works effectively at low steam speeds.

Closest to the invention is -. An injection desuperheater containing a mixing chamber and a protective jacket is placed coaxially with respect to the horizontal body, the mixing chamber being made in the form of a venturi, in the confuser part of which there is a water spray, and a number of confusers are installed in the cavity of the protective jacket.

The disadvantage of the desuperheater is that the process of separating moisture on the confusers increases with a decrease in the constriction modulus of the confuser, which leads to a decrease in the efficiency of the desuperheater by increasing the residual resistance of the device.

The purpose of the invention is to increase the efficiency of the operation of the subcooler by improving the separation of moisture.

This goal is achieved by the fact that the injecting desuperheater contains a mixing chamber installed in the housing with the formation of an annular gap relative to the latter, the mixing chamber made in the form of a Venturi pipe, in the confuser part of which there is a water spray, and a protective jacket, in the cavity of which a number of confusers are installed, a separation an element in the form of a ball mounted between the confusers and made with a diameter exceeding the diameter of the smaller base of the latter, and the protective jacket is perforated Noah.

In the annular gap of the injection desuperheater, an impenetrable partition is installed adjacent to the edges of the large base of the confusers.

The drawing shows an injection desuperheater, General view.

The injection desuperheater comprises a housing 1 with a steam supply pipe 2, a mixing chamber 3 and a protective jacket 4, the mixing chamber 3 is installed in the housing with the formation of an annular gap 5 and is made in the form of a Venturi pipe, in the confuser part of which there is a water spray 6. In the cavity of the protective jacket 4, confusers 7 are installed between which separation elements are arranged in the form of balls 8, and the diameter of the ball 8 exceeds the diameter of the smaller base of the confusers 7. The protective jacket 4 between the confusers 7 is perforated. In the annular gap 5 is installed dense, impermeable partitions 9, adjacent on the one hand to the housing 1, and on the other to the edges of the larger base of the confusers 7.

Injection desuperheater works as follows.

In the mixing chamber 3, a two-phase mixture of steam and water is formed, supplied respectively by the steam supply pipe 2 and the spray 6 of water. A moving two-phase flow is accelerated near the confusers 7 and brings the balls 8 into suspension. In the vicinity of confusers 7, peripheral drops are crushed on the surface of the latter and the water film is torn off the surface of the protective jacket, thereby increasing the aerodynamic spray of water. In the brightness of the balls 8, water drops are captured in the central part of the device, enlarged and released to the permeable wall of the protective jacket 4 . In addition, the chaotic pulsations of the levitating balls 8 turbulize a two-phase flow, which contributes to the destruction of coagulated jets of water and wall films. Impermeable partitions 9 impede the flow of a two-phase flow bypassing confusers 7 and balls 8. With increased permeability of the protective jacket 4, an accelerated drainage of water occurs, eliminating the secondary droplet drop. Partitions 9 can be made integral with the confusers 7 and can be spacer elements.

Balls 8 can be made hollow. Light balls allow the desuperheater to work efficiently at low steam consumption.

The use of an injected desuperheater will ensure the required level of moisture separation and reduce the residual resistance of the device.

Claims (2)

Claim 1. Injection desuperheater containing a mixing chamber installed in the housing with the formation of an annular gap relative to the latter, the mixing chamber made in the form of a Venturi pipe, in the confuser part of which there is a water spray, and a protective jacket, in the cavity of which a number of confusers are installed, characterized in that, for the purpose of moisture separation, it contains a separation element in the form of a ball mounted between confusers and made with a diameter exceeding the diameter of the smaller base of the latter, and the protective rub The plate is perforated. 2 .. Desuperheater according to Claim. 1, with the exception of 1 '. that an annular barrier is installed in the annular gap adjacent to the edges of the larger base of the confusers.