JP2006029182A - Process steam control device using steam turbine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a process steam control device using a steam turbine, capable of surely using mechanical energy generated by the steam turbine. <P>SOLUTION: A steam pressure control valve 9 is installed in a steam supply pipe 8, and is connected to a steam using apparatus 7, and is connected to an ejector 1 via a steam trap 13 in a lower part of the steam using apparatus 7. A vacuum pump means is composed of the ejector 1, a circulating passage 2, a tank 17 and a circulating pump 3. The steam turbine 4 is connected to the circulating pump 3 by interposing an induction electric motor 15. A branch pipe 10 and a turbine steam discharge pipe 11 are connected to the steam turbine 4. Steam reduced in pressure up to a predetermined value by the steam pressure control valve 9 and the steam turbine 4, is supplied to the steam using apparatus 7. The mechanical energy of the steam turbine 4 is surely used by the vacuum pump means. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a process steam control device using a steam turbine that supplies steam to a steam use location via a steam supply pipe and also supplies steam to the steam use location via a steam turbine. The present invention relates to a so-called vacuum steam in which the steam pressure supplied to the steam use location is slightly higher than the atmospheric pressure or is lower than the atmospheric pressure. 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, it is converted into mechanical energy by the steam turbine to reduce the pressure of the steam to a predetermined value, and by using the mechanical energy generated by the steam turbine separately, the steam energy is effective. It is intended for utilization.

In the process steam control device using the conventional steam turbine described above, when there is no driven machine that should use the mechanical energy generated in the steam turbine, the mechanical energy generated must be used effectively. There was a problem that could not be.
JP-A-2-61305

  The problem to be solved is to arrange a driven machine that is paired with the process steam supply unit, and to ensure that the mechanical energy generated by the steam turbine is used by the driven machine, thereby effectively using the steam energy. It is to obtain a process steam control device using a steam turbine that can be realized.

  The present invention includes a steam supply pipe that supplies steam necessary for a steam use location, a steam control valve attached to the steam supply pipe, and a branch pipe that branches from the steam supply pipe and is connected to a steam turbine. The steam turbine is connected to the vacuum pump means, and the vacuum pump means is constituted by a circulation pump, an ejector, a tank, and a circulation passage.

  In the present invention, by connecting the vacuum pump means to the steam turbine, the mechanical energy generated in the steam turbine is reliably used by the vacuum pump means as the driven machine, so that the steam energy can be effectively utilized. it can.

  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 8 that supplies steam to the steam using device 7, a steam pressure control valve 9 attached to the steam supply pipe 8, a branch pipe 10 that branches the steam supply pipe 8, and a branch pipe 10 The connected steam turbine 4 and the vacuum pump means including the ejector 1, the circulation passage 2, the tank 17, and the circulation pump 3 constitute a process steam control device using the steam turbine.

  A boiler 6 as a steam generation source and a steam using device 7 are connected by a steam supply pipe 8. The steam pressure control valve 9 attached to the steam supply pipe 8 arbitrarily controls the pressure of the steam supplied to the steam using device 7 to a level slightly higher than the atmospheric pressure or a so-called vacuum steam pressure lower than the atmospheric pressure. It is something that can be done. A branch pipe 10 that supplies steam for driving to the steam turbine 4 and a turbine steam discharge pipe 11 that discharges steam from the steam turbine 4 and supplies the steam to equipment 7 are connected to each other. A steam control valve 12 that controls the amount of steam supplied to the steam turbine 4 is attached to the branch pipe 10.

  A steam trap 13 is attached to the lower part of the steam using device 7. The steam trap 13 is a kind of automatic valve that discharges only the condensed water that has been deprived of heat in the steam-using device 7 and does not discharge steam. The outlet side of the steam trap 13 is connected to the suction chamber of the ejector 1 by a pipe 14.

  The circulation pump 3 disposed in front of the ejector 1 sucks the fluid in the tank 17 and discharges it to the ejector 1 side. An induction motor 15 is interposed between the circulation pump 3 and the steam turbine 4. The steam turbine 4 is rotationally driven by the steam supplied from the branch pipe 10 to the steam turbine 4, and this rotational force is transmitted to the circulation pump 3 via the induction motor 15. In addition, the induction motor 15 can start electric power generation and can obtain predetermined electric power, when the steam turbine 4 will be in the output state more than the rotational force which the circulation pump 3 requires.

Circulating water is discharged from the circulation pump 3 to the ejector 1, and suction force is generated by the ejector 1. Condensate discharged from the steam trap 13 is sucked and accumulated in the tank 17, and a part of the fluid is in the circulation passage 2. Circulate. Excess condensate is recovered in the boiler 6 by controlling the opening of the control valve 16 attached to the condensate recovery pipe 5 while maintaining the amount of circulating fluid in the circulation passage 2 to the minimum necessary.

The steam that consumes predetermined energy by driving the steam turbine 4 is decompressed to a predetermined pressure value, mixed in the steam supply pipe 8 from the turbine steam discharge pipe 11, and supplied into the steam using device 7. In this case, steam having a predetermined pressure from the steam turbine 4 and steam controlled to a predetermined pressure by the steam pressure control valve 9 are supplied to the steam using device 7, whereby the steam using device 7 has a predetermined steam pressure. It becomes a state.

  The vacuum pump means comprising the ejector 1, the circulation passage 2, the tank 17 and the circulation pump 3 is generally arranged between the steam using device 7 and the boiler 6. In this way, by arranging the vacuum pump means paired with the boiler 6 as the process steam supply unit and using the mechanical energy generated in the steam turbine 4 with the vacuum pump means, the steam energy can be effectively used. Can be used.

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 Ejector 2 Circulation path 3 Circulation pump 4 Steam turbine 6 Boiler 7 Steam use apparatus 8 Steam supply pipe 9 Steam pressure control valve 10 Branch pipe 11 Turbine steam discharge pipe 13 Steam trap 15 Induction motor

Claims (1)

A steam turbine comprising: a steam supply pipe for supplying necessary steam to a place where steam is used; a steam control valve attached to the steam supply pipe; and a branch pipe branched from the steam supply pipe and connected to the steam turbine. A process steam control device using a steam turbine, wherein the steam pump means is connected to a vacuum pump means, and the vacuum pump means comprises a circulation pump, an ejector, a tank, and a circulation passage.

Images