Method and device for regulating the production of steam in a steam plant

a technology of steam plant and steam temperature, which is applied in the direction of water supply installation, lighting and heating apparatus, gas/liquid distribution and storage, etc., can solve the problems of difficult to achieve accurate temperature control and greatly influence the temperature to be controlled, and achieve accurate and stable control

Inactive Publication Date: 2013-05-30
BACKI CHRISTOPH +5
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0006]This object is achieved by the state controller being a linear-quadratic controller according to the invention. Such a linear-quadratic controller (LQR) can include a linear-quadratic optimum state feedback. In this case, its parameters can be determined in such a way that an effectiveness criterion for the controlling quality can be optimized. As a result of this, a both accurate and stable control can be achieved.
[0023]It is proposed that the state controller is a linear-quadratic controller. An accurate and stable control can be achieved.

Problems solved by technology

In addition, the temperature to be controlled is greatly influenced by numerous disturbances, such as load changes, sootblowing in the boiler, changes of fuel, etc.
An accurate temperature control is very difficult to achieve for these reasons.

Method used

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  • Method and device for regulating the production of steam in a steam plant
  • Method and device for regulating the production of steam in a steam plant
  • Method and device for regulating the production of steam in a steam plant

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Embodiment Construction

[0033]FIG. 1 shows a schematic view of a detail from a steam power plant with a steam power plant which comprises a steam turbine 2, a boiler 4, and evaporator 6 and a superheater 8. The boiler 4 gives off heat to the evaporator 6, into which flows feed water 10 which is pumped by a feed-water pump 12 to the evaporator 6 and which absorbs the heat. By means of a valve 14, the feed-water flow can be controlled.

[0034]As a result of the absorption of heat, the feed water 10 is evaporated in the evaporator 6, and the resulting steam 16 flows on to the superheater 8 in order to be superheated there to form live steam and then to be fed to the steam turbine 2. For controlling the temperature of the steam 16, the feed-water flow is controlled by means of the valve 14 and / or the feed-water pump 12, wherein a setpoint flow of the feed water 10 upstream of the evaporator 6 is the controlled variable and a valve position and / or a pump output is the manipulated variable.

[0035]A temperature sens...

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Abstract

A method for regulating the production of steam from feed water in an evaporator of a steam plant is provided. A state regulator calculates a plurality of states of a medium in the evaporator by means of an observer and, on the basis thereof, determines a feed water mass flow rate as a regulating variable. In order to obtain a stable and precise regulation of the temperature of the steam, the state regulator is a linear-quadratic regulator.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is the US National Stage of International Application No. PCT / EP2010 / 064376, filed Sep. 28, 2010 and claims the benefit thereof. The International Application claims the benefits of German application No. 10 2009 047 652.0 DE filed Dec. 8, 2009. All of the applications are incorporated by reference herein in their entirety.FIELD OF INVENTION[0002]The invention refers to a method for regulating the production of steam from feed water in an evaporator of a steam power plant, in which in a first control system a state controller calculates a plurality of medium states in the evaporator by means of an observer and determines therefrom a feed-water mass flow as a manipulated variable of the first control system.BACKGROUND OF INVENTION[0003]The efficiency of a steam power plant increases with the temperature of the steam which is produced in the power plant boiler and with the constancy of the quality of the steam which is prov...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F22D5/26
CPCF01K13/00F22D5/26F22B35/00F01K13/02Y10T137/0374
Inventor BACKI, CHRISTOPHGADINGER, JORGMEERBECK, BERNHARDTREUER, MICHAELWEISSBACH, TOBIASWENDELBERGER, KLAUS
Owner BACKI CHRISTOPH
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