JPS593178A - Control device for flashing type geothermal steam turbine - Google Patents

Abstract

PURPOSE:To perform effective prevention of invasion of drain into the turbine by a method wherein a separator for separating drain in the steam is arranged upstream from a main steam trap of the steam flowing pipe and the main steam trap is closed according to the volume of drain separated by the separator. CONSTITUTION:A geothermal well 1 is connected via a flowing-in pipe 2 to a flasher 3, separator 4, main steam trap 5, steam adjuster valve 6 and turbine 7, in this sequence. A steam pressure control valve 8 is connected between the flasher 3 and the separator 4. The separator 4 is set up in such a way that several corrugated plates 11 are arranged in parallel in a case 10, the drain is collected by letting the steam to collide against the corrugated plates 11 when the steam flows in a direction of A, dropped from the drain holes 12 and then guided to the water level sensor 13. When the water level sensor 13 detects that the drain is accumulated up to the desired water level, the solenoid 17 is energized through a relay 16, the main steam trap 5 is closed and then the turbine 7 is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a control device for preventing condensate from entering a flash type geothermal steam turbine.

[Technical background of the invention]

In a general flash-type geothermal steam turbine control system, the supplied steam side (flasher equipment manufacturer)
Since the pressure and temperature of the steam generated at the turbine was controlled and a constant amount of steam was obtained at the turbine, a condensate intrusion prevention control device was not included, which served as a dual purpose device.

[Problems with background technology]

However, in steam turbines that are forced to operate continuously for long periods of time, pressure and temperature control equipment malfunctions occur on the flasher side due to corrosion peculiar to geothermal steam and stick accidents due to adhesion of impurities. If condensate enters the turbine due to wet steam entering due to a drop in temperature, troubles such as turbine blade erosion and blade scattering accidents may occur.

[Purpose of the invention]

An object of the present invention is to provide a control device for obtaining a highly reliable flash type geothermal steam turbine device.

[Summary of the invention]

In the present invention, a separator for separating condensate from the steam is installed on the upstream side of the main steam stop valve of the steam turbine inflow pipe, and when the amount of condensate separated by this separator reaches a predetermined value, This closes the main steam stop valve and safely stops the turbine.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 3.

First, as shown in Figure 1, the geothermal well (1) is connected to the inlet pipe (2).
), connect the flasher (3), separator (4), main steam stop valve (ijl), steam control valve (6), and turbine (power) in this order. A steam pressure control valve (8) is connected between the turbine and the
a, 1 (91 are connected.
) is shown in Fig. 2, which is an enlarged cross-sectional view taken along the line -
A large number of υ are installed side by side, and a large number of drains are opened at the bottom of the case 00). When steam tries to pass through as shown by arrow A, the water in the steam, so-called drain, flows through the corrugated plate ←
It collides with υ and flows down from the drain hole A to arrow B in Figure 3.
As shown in the figure, the water level detector (enters the first floor). An orifice (14) is provided near the bottom of the water level detector (13) to drain a small amount of condensate, but when a large amount of condensate accumulates, , is detected by the float valve 05), converted into an electric signal by the relay 06I, and transmitted to the solenoid 07), and the solenoid <17) is configured to operate based on this signal and close the main steam stop valve (5). .

Next, the effect will be explained.

Separation 'a (4) separates a large amount of condensate from wet steam, and when the water level detector on the 0th floor detects that the condensate has reached a predetermined water level, the main steam stop valve (5) is activated by the solenoid (17). Therefore, when steam with a high moisture content is to be sent to the turbine (7), the turbine (7) can be completely stopped by closing the main steam stop valve (5). Therefore, it becomes a control device for a flash type geothermal steam turbine with high safety.

It should be noted that the present invention is not limited to the embodiments described above and shown in the drawings, but can of course be implemented with various modifications without changing the gist thereof.

〔Effect of the invention〕

As explained above, a separator is installed on the upstream side of the main steam stop valve in the steam turbine inlet pipe, and the main steam stop valve is closed depending on the amount of condensate separated by this separator. When so-called wet geothermal steam containing a large amount of steam is about to enter the turbine, it is advantageous to have a control system for a flash type geothermal steam turbine that can safely stop the turbine so that condensate based on the wet steam does not enter the turbine. It will be done.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing an embodiment of the flash type geothermal steam turbine control device of the present invention, and FIG.
FIG. 3 is an enlarged vertical cross-sectional view of the separator taken along line II, and is an explanatory diagram showing the operating system for the solenoid and the main steam stop valve in the vertical cross-sectional view showing the water level detector of FIG. 1. l...Geothermal well 2...Inflow pipe 3...Flasher 4...Separator 5...Main steam stop valve 7...Turbine 13...
・Water level detector 16...Relay 17...Solenoid W43 diagram

Claims (1)

[Claims] In a control device that prevents condensate from entering a flash type geothermal steam turbine, a separator that separates condensate from steam is installed upstream of the main steam stop valve in the steam turbine inlet pipe, and condensate separated by this separator is installed. A control device for a flash type geothermal steam turbine, characterized in that a main steam stop valve is closed.