JP2008223701A - Control device of process steam utilizing steam turbine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control device of process steam utilizing a steam turbine with long life stabilizing a feeding steam pressure. <P>SOLUTION: A steam generation source 1 and a high pressure header 5 are connected by a steam feeding pipe 2. The high pressure header 5 and a plurality of steam turbines 3, 4 arranged in parallel are connected by branch pipes 10, 11. Control valves 6, 7 and flow rate sensors 8, 9 are mounted to the branch pipes 10, 11. Outlets of the steam turbines 3, 4 are connected to a low pressure header 12 and the steam feeding pipe 2 is communicated with it. Since the flow rate of the steam fed from the high pressure header 5 to the steam turbines 3, 4 is controlled by the control valves 6, 7 so as to become a set value respectively, the steam pressure fed to a steam use position is stabilized. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a process steam control apparatus using a steam turbine that supplies steam necessary for use to a steam via a steam supply pipe and drives a steam turbine with the supplied steam. Here, the process steam indicates the steam supplied to the steam use location.

A conventional process steam control device using a steam turbine has a steam supply pipe and a steam turbine arranged in parallel, and supplies a predetermined amount of steam from the steam supply pipe to a steam use location, while a shortage from the steam turbine. By supplying steam to the location where the steam is used, the steam heat energy is converted to mechanical energy by the steam turbine and the pressure of the steam is reduced to a predetermined value, and the mechanical energy generated by the steam turbine is used separately. In order to make effective use of steam energy.

In the process steam control device using the conventional steam turbine described above, when a plurality of steam turbines are installed by increasing the amount of steam used at the steam use location, the plurality of steam turbines alternately repeat the operation and stop, A so-called hunting phenomenon is caused, and there is a problem that a supply steam pressure to a steam use place is not stable, and a problem that a steam turbine fails in a short period of time.
JP-A-2-61305

  The problem to be solved is to obtain a process steam control apparatus using a steam turbine that prevents the hunting phenomenon of a plurality of steam turbines, stabilizes the supply steam pressure, and has a long life.

  The present invention supplies steam generated from a steam generation source to a place where steam is used via a steam supply pipe, and connects steam turbines to the steam supply pipe. The control valve for controlling the amount of steam supplied to the steam turbine is attached to the inlet side of the steam turbine, the flow rate detecting means is attached to the steam supply pipe or the steam turbine, and the control valve is controlled according to the detection value from the flow rate detecting means. A controller for adjusting the valve opening degree is arranged.

  In the present invention, by controlling the amount of steam supplied to a plurality of steam turbines with a control valve in accordance with the detected value of the flow rate detecting means, the plurality of steam turbines are continuously driven to repeat operation and stop. Therefore, the hunting phenomenon of a plurality of steam turbines can be prevented, the supply steam pressure can be stabilized and the life of the steam turbine can be extended.

  As the steam turbine, those conventionally used can be used, and a single-stage or multi-stage back pressure turbine, an extraction turbine, or the like can be used.

  In FIG. 1, a steam supply pipe 2 for supplying steam from a steam boiler 1 as a steam generation source to a steam use location (not shown) and a plurality of steam turbines 3 and 4 attached to the steam supply pipe 2 A process steam control device using a turbine is configured.

  A high pressure header 5 is interposed between the steam boiler 1 and the steam turbines 3 and 4, and the high pressure header 5 is connected to the steam turbines 3 and 4 arranged in parallel by branch pipes 10 and 11, respectively. The branch pipes 10 and 11 are provided with steam control valves 6 and 7 for controlling the amount of steam supplied to the steam turbines 3 and 4 and flow rate sensors 8 and 9 as flow rate detecting means for detecting the flow rate of the supplied steam. The flow sensors 8 and 9 are electrically connected to the steam control valves 6 and 7 via a controller (not shown).

  In the present embodiment, an example in which the flow rate sensors 8 and 9 are used as the flow rate detection means has been shown. it can.

  The outlet side of the steam turbines 3 and 4 is connected to the steam supply pipe 2 via a low-pressure header 12. The steam supply pipe 2 is provided with a pressure control valve 13 for controlling the steam pressure supplied to the steam use location.

The high-pressure header 5 and the low-pressure header 12 communicate with each other through a communication pipe 14 with a valve 15 interposed. With this communication pipe 14, the high-pressure header 5 and the low-pressure header 12 can be directly connected without passing through the steam turbines 3 and 4.

  For example, the flow rate of steam supplied to the steam turbines 3 and 4 arranged in parallel is set to 2.5 ton / H from a controller (not shown), while the flow rate of the control valve 6 is set to 1.5 ton. By setting to / H, the total amount of supplied steam can be set to 4.0 ton / H.

By supplying the steam of each flow rate from the high-pressure header 5 to the steam turbines 3 and 4 arranged in parallel, a plurality of steam turbines are continuously driven so that the operation and the stop are not repeated. The hunting phenomenon of a plurality of steam turbines can be prevented, the supply steam pressure can be stabilized, and the life of the steam turbine can be extended.

The block diagram which shows the Example of the control apparatus of the process steam | steam using the steam turbine of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Steam generation source 2 Steam supply pipe 3, 4 Steam turbine 5 High pressure header 6, 7 Control valve 8, 9 Flow rate detection means 12 Low pressure header

Claims (1)

The steam generated from the steam generation source is supplied to the steam use location via the steam supply pipe, and the steam turbine is connected in parallel to the steam supply pipe. A control valve for controlling the amount of steam supplied to the steam turbine is attached to the inlet side of the engine, and a flow rate detecting means is attached to the steam supply pipe or the steam turbine, and the valve opening of the control valve is determined according to the detected value from the flow rate detecting means. A process steam control device using a steam turbine, characterized in that a controller for adjusting the temperature is arranged.

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