Steam expander as a throttling valve replacement in industrial plants: A techno-economic feasibility analysis

Frate, Guido Francesco; Ferrari, Lorenzo; Lensi, Roberto; Desideri, Umberto

doi:10.1016/j.apenergy.2019.01.005

Cited by 11 publications

(4 citation statements)

References 26 publications

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“…Table 1 shows HP and IP steam parameters generated by HRSG at minimum and maximum GT load. The IP steam and low pressure (LP) steam extraction pressures are controlled by throttling of IP and LP control valves [6]. Besides the IP and LP extractions, there exists also a so called HP extraction, fig.…”

Section: Figure 1 Natural-gas-fired Combined Gas-steam Chp Cyclementioning

confidence: 99%

Off-design flow analysis of cogeneration steam turbine with real process data

2022

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This paper presents the concept of reconstruction of the existing coal-fired combined heat and power plant to comply with new European environmental policies. The existing coal-fired boiler will be replaced by two new dual pressure heat recovery steam generators, which will utilize the exhaust gas heat from two new gas turbines. The steam from the heat recovery steam generators will be fed to the existing steam turbine. After the reconstruction, the nominal turbine inlet steam mass-flow of 40 kg/s will be reduced to 30 kg/s. During periods of low heat demand, only one gas turbine and one heat recovery steam generator will be in operation and the live steam mass-flow may drop even to 12 kg/s. Prior to the reconstruction, dedicated tests of the existing steam turbine were carried out using the steam from the existing coal-fired boiler. The goal of the test was to verify the viability of operation with such an extremely low mass-flow. The results of tests show that such operation is possible but inefficient from a power generation point of view. Besides this, the turbine control algorithm needs to be accommodated to this extreme operating regime and additional measures like displacement of the extraction points and steam cooling will be required to control the temperature of the steam extractions. The novelty of this paper is using real pre-reconstruction process data for the assessment of feasibility and efficiency of the post-reconstruction operation of a combined heat and power turbine.

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Section: Figure 1 Natural-gas-fired Combined Gas-steam Chp Cyclementioning

confidence: 99%

Off-design flow analysis of cogeneration steam turbine with real process data

2022

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“…(2019) [11] reported a plant design platform to optimize the thermodynamic performance of an organic Rankine cycle (ORC). Frate et al (2019) [12] after a thorough techno-economic review of a power plant recommended replacing the throttling valve with a steam expander. Yang et al (2020) [13] analyzed multi-objective optimization for designing combined cooling, heating, and power systems with a supercritical carbon dioxide recompression Brayton cycle to maximize the electricity efficiency and total product.…”

Section: Introductionmentioning

confidence: 99%

Techno-economic evaluation and optimization of CCGT power Plant: A multi-criteria decision support system

Chen

Tsoutsanis

et al. 2021

Energy Conversion and Management

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“…As an effective method to achieve energy-saving, pressure energy recovery has been widely considered in recent years, with applications including gas pressure reduction stations, air conditioning systems, fuel cells, heat pumps, steam pipes, etc. − Additionally, the research and application of gas pressure energy recovery has been more frequent. Usually, the gas pressure regulating station uses a throttling valve or a pressure control valve to reduce the gas pressure in the transmission pipeline and to convey it to the user.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Off-Design Performance Analysis of a Screw Expander-Based Steam Pressure Energy Recovery System in a Combined Heat and Power Unit

et al. 2021

ACS Omega

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A screw expander-based heating system is proposed based on a 330 MW combined heat and power unit to recover the extraction steam pressure energy. EBSILON Professional software was applied to model the proposed system, and the thermal performance of the traditional system and the new system was compared under different operating conditions. The results show that under the designed heating condition, the standard coal consumption rate of the new system is reduced by 4.74 g/kWh, and the exergy efficiency of the heating process is increased by 17.29%. When the extraction steam pressure changes with the load within a range greater than 0.1 MPa, there is an optimal operating range for the new system, which is related to the built-in pressure ratio of the screw expander and the extraction steam pressure difference, and the distribution of the optimal operating range varies with the supply-water temperature. The heating process exergy efficiency of the two systems shows opposite trends under off-design conditions. Additionally, under the condition of meeting the extraction steam pressure, the method for increasing the output power of the screw expander by adjusting the butterfly valve to increase the extraction steam pressure only increases the standard coal consumption rate of the system. Furthermore, through an application case study, the annual economic benefit of the new system is expected to be ¥ 4.15 million, and the payback period is 5.02 years.

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Steam expander as a throttling valve replacement in industrial plants: A techno-economic feasibility analysis

Cited by 11 publications

References 26 publications

Off-design flow analysis of cogeneration steam turbine with real process data

Off-design flow analysis of cogeneration steam turbine with real process data

Techno-economic evaluation and optimization of CCGT power Plant: A multi-criteria decision support system

Modeling and Off-Design Performance Analysis of a Screw Expander-Based Steam Pressure Energy Recovery System in a Combined Heat and Power Unit

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