The influence of membrane-cryogenic technology of oxygen separation from air on the efficiency of supercritical coal units with the CCS installation

Kotowicz, J.; Berdowska, Sylwia; Skorek‐Osikowska, Anna

doi:10.5004/dwt.2017.11403

Cited by 1 publication

(5 citation statements)

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“…The variant V2 of an oxy-type power plant was equipped with a hard-coal-fired, pulverized-fuel boiler and a hybrid air separation unit [61][62][63][64]. A schematic diagram of both installations is presented in Figure 5.…”

Section: Variant V2-steam Boiler and Description Of The Asumentioning

confidence: 99%

“…The difference is that an additional single-stage membrane separator is used in the structure in order to raise the oxygen content at the inlet to the cryogenic part of the ASU. The membrane installation was modeled in the Aspen Custom Modeler 2004 [61][62][63][64]. Such changes in the ASU's structure greatly reduce the flow rate of gas through the compressors and the cryogenic installation; thus, the auxiliary power of the ASU is reduced as well.…”

Section: Variant V3a-steam Boiler and Description Of The Asumentioning

confidence: 99%

“…The authors in the literature [61][62][63][64] analyzed low-temperature separation membranes made of the following four materials: polyethylene oxide (PPO), Matrimid, phenolic resin, and carbon/ZSM5. Based on these analyses, phenolic resin was chosen as the best of the materials that were considered.…”

Section: Variant V3a-steam Boiler and Description Of The Asumentioning

confidence: 99%

“…The O 2 /N 2 selectivity coefficient (α) calculated with the use of both quantities was 10.65. The main assumptions for the computations of the hybrid ASU model are presented in Table 4 [61][62][63][64]. The remaining assumptions were the same as in the V1 variant (Table 2).…”

Section: Variant V3a-steam Boiler and Description Of The Asumentioning

confidence: 99%

“…The CC unit can be divided into two main parts. In the first, the flue gas was: • Variant V1-an oxy-type power plant equipped with a lignite-fired, fluidized-bed boiler and cryogenic ASU [59,60]: • Variant V2-an oxy-type power plant equipped with a hard-coal-fired, pulverized-fuel boiler and hybrid ASU (membrane-cryogenic) [61][62][63][64]; • Variant V3a-an oxy-type power plant equipped with a lignite-fired, fluidized-bed boiler and ASU with a three-end type, high-temperature membrane (HTM) [65,66]; • Variant V3b-an oxy-type power plant equipped with a hard-coal-fired, pulverized-fuel boiler and ASU with a four-end type, high-temperature membrane (HTM) [3,67,68].…”

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confidence: 99%

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The Characteristics of a Modern Oxy-Fuel Power Plant

2019

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This paper presents the thermodynamic and economic analyses of four variants of a supercritical oxy-type plant. These variants differed in terms of air separation units (ASU, variants: V1—cryogenic; V2—hybrid; equipped with a three-end (V3a) or four-end (V3b) high-temperature membrane) and boilers (V1 and V3a—lignite-fired fluidized-bed; V2 and V3b—hard-coal-fired pulverized-fuel). The gross power of steam turbine unit (STU) was 600 MW. The live and reheated steam parameters were 650 °C/30 MPa and 670 °C/6.5 MPa, respectively. The influence of the ASUs’ operating parameters on the ASUs’ auxiliary power rate and boiler efficiency (V3a and V3b only) was studied. The ASUs’ operating parameters for maximum net efficiency were then determined. The decrease in the net efficiency compared to a reference plant (with a classic fluidized-bed or pulverized-fuel boiler) fluctuated in the range 7.2 (V3b)–11.2 (V1) p.p. An analysis of the waste heat utilization was performed (fuel drying—V1 and V3a; STU steam-water heat exchangers replacing). Thus, the efficiency decreases fluctuated in the range 4.3 (V3b)–10.2 (V1) p.p. The economic analysis showed that in order for the variants to be economically viable, the unit CO2 emission cost should be greater than 42.2 (V1) or 22.0 (V3b) EUR/MgCO2.

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Section: Variant V2-steam Boiler and Description Of The Asumentioning

confidence: 99%