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Research Papers: Gas Turbines: Electric Power

Investigation of Different Operation Strategies to Provide Balance Energy With an Industrial Combined Heat and Power Plant Using Dynamic Simulation

[+] Author and Article Information
Steffen Kahlert

Institute for Energy Systems,
Technical University of Munich,
Boltzmannstr. 15,
Garching bei München 85748, Germany
e-mail: steffen.kahlert@tum.de

Hartmut Spliethoff

Institute for Energy Systems/ZAE Bayern,
Technical University of Munich,
Boltzmannstr. 15,
Garching bei München 85748, Germany
e-mail: spliethoff@tum.de

Contributed by the Electric Power Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received June 2, 2016; final manuscript received June 27, 2016; published online August 16, 2016. Editor: David Wisler.

J. Eng. Gas Turbines Power 139(1), 011801 (Aug 16, 2016) (8 pages) Paper No: GTP-16-1202; doi: 10.1115/1.4034184 History: Received June 02, 2016; Revised June 27, 2016

Intermittency of renewable electricity generation poses a challenge to thermal power plants. While power plants in the public sector see a decrease in operating hours, the utilization of industrial power plants is mostly unaffected because process steam has to be provided. This study investigates to what extent the load of a combined heat and power (CHP) plant can be reduced while maintaining a reliable process steam supply. A dynamic process model of an industrial combined CHP plant is developed and validated with operational data. The model contains a gas turbine (GT), a single pressure heat recovery system generator (HRSG) with supplementary firing and an extraction condensing steam turbine. Technical limitations of the gas turbine, the supplementary firing, and the steam turbine constrain the load range of the plant. In consideration of these constraints, different operation strategies are performed at variable loads using dynamic simulation. A simulation study shows feasible load changes in 5 min for provision of secondary control reserve (SCR). The load change capability of the combined cycle plant under consideration is mainly restricted by the water–steam cycle. It is shown that both the low pressure control valve (LPCV) of the extraction steam turbine and the high pressure bypass control valve are suitable to ensure the process steam supply during the load change. The controllability of the steam turbine load and the process stability are sufficient as long as the supplementary is not reaching the limits of the operating range.

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Figures

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Fig. 1

Negative secondary control reserve prequalification test

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Fig. 2

Combined heat and power plant (simplified)

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Fig. 3

Load-dependent gas turbine parameters

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Fig. 4

Heat recovery system generator model (simplified)

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Fig. 5

Steam turbine model

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Fig. 6

Flow chart of load control

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Fig. 7

Validation load change

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Fig. 8

Validation of live steam parameters

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Fig. 9

Load range of the CHP plant

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Fig. 10

Standard secondary control reserve load change

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Fig. 11

Secondary control reserve load change (decreased low pressure flow)

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Fig. 12

Secondary control reserve load change (high process steam demand)

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Fig. 13

Secondary Control Reserve load change (decreased low pressure flow with high pressure bypass)

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Fig. 14

Secondary control reserve load change with high pressure bypass and double steam turbine load change

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Fig. 15

Secondary control reserve load change (min. low pressure flow)

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