| 1. |
- Dahlquist, Erik, et al.
(författare)
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Modelling and Simulation of Biomass Conversion Processes
- 2015
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Ingår i: Proceedings - 8th EUROSIM Congress on Modelling and Simulation, EUROSIM 2013. - 9780769550732 ; , s. 506-512
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Konferensbidrag (refereegranskat)abstract
- By utilizing biomass gasification, the energy contentof the biomass can be utilized to produce gas to be used forcogeneration of heat and power as well as other energy carrierssuch as fuels for vehicles. The concept is suitable forapplication to existing CHP plants as well as for utilizing spentliqour in small scale pulp and paper mills. The introductionwould enable flexible energy utilization, use of problematicfuels as well as protects the environment by e.g. avoiding therelease of toxic substances. In this paper, the possibilities todevelop this concept is discussed. In this paper we comparedifferent gasification processes with respect to what gas qualitywe get, and how the gasification can be modelled usingdifferent modelling approaches, and how these can becombined. Results from simulations are compared toexperimental results from pilot plant operations in differentscales and with different processes like CFB and BFBTechnologies, athmospheric and pressurized, and using steam,air and oxygen as oxidizing media.
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| 2. |
- He, C., et al.
(författare)
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PV integration potential with infrastructures in steel industry and its technoeconomic analysis
- 2020
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Ingår i: Energy. Proc.. - : Scanditale AB.
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Konferensbidrag (refereegranskat)abstract
- The high energy consumption of the steel industry has been a major challenge for the sustainability and environmental protection. Steel companies, the backbone of heavy industry in China take a vital position in climate change mitigation. To pursue sustainability and decrease emissions, an increasing number of steel companies tend to seek help from renewable energy. Integrating solar photovoltaics (PV) at steel plants is promising to reach the target. This paper investigates the potential capacity, potential output and economic performance of PV technology of 228 steel plants in China. The results indicate that the huge potential capacity and output are up to 6.96×106 KW and 9.71×109 kWh, respectively. Moreover, the ROI and profit under all self-consumption scenarios and all feed-into grid scenarios are evaluated, which shows integrating PV into the steel industry is also profitable. Among two scenarios, the all self-consumption scenario earns a higher ROI and profit compared with the all feed-into grid scenario.
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| 3. |
- Hu, C., et al.
(författare)
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Different control strategies for MEA based chemical absorption
- 2021
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Ingår i: Energy Proceedings. - : Scanditale AB.
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Konferensbidrag (refereegranskat)abstract
- When capturing CO2 from biomass fired combined heat and power plants, the dynamic changes in the feedstock and the heat and electricity demands can clearly affect the operation of the boiler, which can further affect the performance of chemical absorption CO2 capture. To handle such dynamic changes, control systems are needed. This work aims to compare the performance of two control strategies that can control the reboiler duty in the stripper to achieve a constant capture rate. Control strategy A uses the reboiler temperature as input based on a PID controller; and control strategy B is a modification of control strategy A by introducing a feedforward compensation based on the flowrate of rich solution when regulating the reboiler duty. Based on dynamic simulations, it is found that control strategy B can reduce the settling time and capture more CO2 with a lower average energy penalty within a certain time length.
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| 4. |
- Hu, C., et al.
(författare)
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Dynamic simulation of CO2 capture from biomass power plant by MEA
- 2020
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Ingår i: Energy Proceedings. - : Scanditale AB.
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Konferensbidrag (refereegranskat)abstract
- The bioenergy with CO2 capture and storage (BECCS) is a promising solution to cut CO2 emissions and will play an important role in achieving the climate goal of 1.5°C. As the properties of biomass varies significantly, it is of importance to understand the dynamic performance when capturing CO2 from biomass fired power plants. This work is to reveal the dynamic performance of chemical absorption. The aqueous solution of monoethanolamine (MEA) was selected as the solution. By using the real flue gas (FG) data, the influence of FG flow rate on CO2 capture were studied by doing dynamic simulations. It has been found that as the FG flow rate decreases, the CO2 capture rate first rose before going down; and the reboiler duty decreased while the energy consumption of CO2 capture increased.
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| 5. |
- Liu, S., et al.
(författare)
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Improvement of control strategy of CO2 capture from biomass CHP plant by chemical absorption
- 2022
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Ingår i: Clean Coal Technology. - : China International Book Trading Corp. (Guoji Shudian). - 1006-6772. ; 28:9, s. 112-121
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Tidskriftsartikel (refereegranskat)abstract
- When capturing CO2 from biomass fired combined heat and power (CHP) plants, the changes in the feedstock and the heat and electricity demands affect the performance of chemical absorption CO2 capture system. To handle such impact, this paper proposed an improved reboiler duty control strategy (control strategy B) based on the evaluation of the control performance of the traditional feedback control strategy (control strategy A) to achieve a constant capture rate. Control strategy B is based on control strategy A, and introduces feedforward compensation based on rich solution flow rate to form a feedforward plus feedback control strategy. This work aimed to find a control strategy suitable for chemical absorption CO2 capture from biomass CHP, by comparing the control performance, capture system performance and flexible operation performance of both control strategies. Based on the dynamic simulations of CO2 capture from actual biomass fired CHP plant, it is found that compared with the control strategy A, the feedforward compensation of the control strategy B can reduce the response time of the reboiler duty to external disturbances, and improve the timeliness and accuracy of the regulation of reboiler duty. The settling time of capture rate is reduced by 54 mins with the control strategy B. Facing the flexible change of capture rate setpoint, the time required for the stabilization of capture rate is reduced by 57.9% with control strategy B. Under the continuous external disturbance, the capture rate is maintained at ±3% of the setpoint with control strategy B. At the same time, the energy penalty is reduced by 0.14%, and the total captured CO2 is increased by 0.35%. In addition, the results of dynamic simulation and traditional steady-state simulation show that the dynamic simulation can reflect the impact of external disturbances on the capture system more accurately, and provide a reference for the integration and optimization of related processes.
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| 6. |
- Wang, S., et al.
(författare)
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A Method to Assess the CO2 Capture Potential from a Biomass-fired CHP
- 2021
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Ingår i: Energy Proceedings. - : Scanditale AB.
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Konferensbidrag (refereegranskat)abstract
- The bioenergy with CO2 capture and storage (BECCS) is an important solution to reduce CO2 emissions. This paper proposed a new method that can accurately access CO2 capture potential from a biomass-fired combined heat and power (BCHP). Chemical absorption is used as CO2 capture technology. By carefully considering the temperatures of the heat required by district heating and CO2 capture, the allocation of the available heat from flue gas condensation and extracted steam condensation for different purposes has been optimized. By using a real BCHP with a thermal capacity of 200MW as a case study, results show that the captured CO2 was 23.42t/day without any change in heat and power supply, which was 1.77% of the total released CO2.
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