# US 5,706,644 A · Method of operating a gas and steam power plant

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- Number: US 5,706,644 A
- Document ID: US5706644A
- Status: Granted
- Kind: A
- Application number: 08/587,497
- Filed: 1996-01-17
- Granted: 1998-01-13
- Earliest claimed: 1995-02-27
- Assignees: Asea Brown Boveri AG
- Inventors: Henrik Nielsen
- Web page: https://patentgrep.com/patent/US5706644A

## CPC

- F01K 23/101: {Regulating means specially adapted therefor (F01K23/105, F01K23/108 take precedence)}
- Y02P 80/15: On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
- F01K: STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES (gas-turbine or jet-propulsion plants F02; nuclear power plants, engine arrangements therein G21D)
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

In a method of operating a power station plant, essentially comprising a gas-turbine group (40, 41, 46), a waste-heat steam generator (8) and a downstream steam consumer (30), the exhaust gas from the gas-turbine group (40, 41, 46) releases heat to the water conducted in counterflow through the waste-heat steam generator (8), and the steam produced is fed to the steam consumer (30) via at least one steam line (6). The water is at any temperature and is fed directly into the waste-heat steam generator (8) via at least one water line (11) having an allocated regulating valve (20) for limiting the flow. During the use of fuels having sulfur contents, the regulating valve (20) is controlled via the temperature of the exhaust gas at the discharge from the waste-heat steam generator (8), at a temperature measuring device (24).

## Claims

### Claim 1

A method of operating a power station plant including a gas-turbine group, a waste-heat steam generator and a downstream steam consumer, the exhaust gas from the gas-turbine group releasing heat to the water conducted in counterflow through the waste-heat steam generator, and the steam produced being fed to the steam consumer via at least one steam line, wherein the water is at any temperature and is fed directly into the waste-heat steam generator via at least one water line having an allocated regulating valve for limiting the flow, and wherein the regulating valve is controlled by a regulating device as a function of measuring devices, during the use of fuels having sulfur contents, the regulating valve is controlled based upon the temperature of the exhaust gas at the discharge from the waste-heat steam generator at a temperature measuring device, and during the use of fuels having no or a low sulfur content, the regulating valve is controlled based upon the temperature of the steam in a steam line at a temperature measuring device.