Integrated Black Liquor Gasification Polygeneration System with CO₂Capture in Pulp and Paper Mills to Produce Methanol and Electricity

Abstract

Based on KAM a pulp and paper mill, a polygeneration system integrated with a black liquor gasifier is proposed. The effects of CO 2 captured by oxygen-fuel combustion and Selexol absorption on the performance of the polygeneration system are studied in terms of both thermodynamic performance and cost assessment. Using the Aspen Plus simulator, the performance of the studied polygeneration systems are analyzed from the perspectives of the first and second laws of thermodynamics. Compared with the reference system, the first law efficiency of the polygeneration system increased from 15.7% to 29.3%, with an investment increment of 17.9%. The investment incremental rates for CO 2 capture by oxyfuel combustion and Selexol absorption are 15.1% and 16.7%, respectively. Energy penalty due to CO 2 capture and compression is 0.61 MJ electricity/kg CO 2 , avoided in the oxygen-fuel method at a cost of $29.6/tonne CO 2 . However, energy penalty can reach 1.03 MJ product (electricity and methanol) per kg CO 2 , avoided in the Selexol absorption CO 2 capture process at a cost of $46.0/tonne CO 2 .

Black liquor gasification with calcium looping for carbon-negative pulp and paper industry

“…Importantly, the revenues from the pulp and newsprint sales are not represented in Figure 8 as these remained the same in all investigated cases. Though the cost of CO2 avoided is higher in the BLG-CaL cases (Case 3 and Case 4) than that in the CaL retrofit case (Case 2, 39.0 €/tCO2), it is still comparable to the results reported by Ferreira and Balestieri (2015) and Zhang et al (2011). Zhang et al (2011) presented the CO2 capture costs on the CO2 captured basis (26.3 and 40.9 €/tCO2 for oxy-fuel combustion and Selexol, respectively) that are lower than the cost per CO2 avoided.…”

“…Though the cost of CO2 avoided is higher in the BLG-CaL cases (Case 3 and Case 4) than that in the CaL retrofit case (Case 2, 39.0 €/tCO2), it is still comparable to the results reported by Ferreira and Balestieri (2015) and Zhang et al (2011). Zhang et al (2011) presented the CO2 capture costs on the CO2 captured basis (26.3 and 40.9 €/tCO2 for oxy-fuel combustion and Selexol, respectively) that are lower than the cost per CO2 avoided. It should also be noted that figures reported in that study were estimated based on the capital costs reported in 2000 and 2005.…”

The Factors of Threshold Pressure Gradient for CO²Miscible Flooding in Low Permeability Reservoir

“…The experimental steps are as follows: (1) connect the experimental devices according to the experimental design and rise to the formation temperature; (2) put the core into the core holder and load the confining pressure and back pressure until reaching the experimental requirements; (3) saturated with the formation water, and make bound water by flooding experimental fluid, and stabilize the pressure; (4) open the experimental fluid accumulator and regulate the inlet pressure; (5) stabilize each pressure for 30 minutes according to the order from small to big, and record outlet fluid flow rate and its corresponding actual pressure; (6) measure three times repeatedly, and it is qualified when the flow rate error is less than 4% .…”

“…[2][3] In the process of low permeability reservoir development, the problems that the threshold pressure gradient is big and the water injection development is difficult which decide to take the development by the way of gas injection, especially the CO 2 injection development is an effective way of exploitation. [4][5] As an effective method of utilizing the greenhouse gas comprehensively, the technology of CO 2 flooding is taken increasingly to enhance the oil recovery. And the CO 2 miscible flooding technology also has a good application prospect in the low permeability reservoir development.…”

Extractive Capacity of CO₂ in Oil Saturated Porous Media

“…In recent years, greenhouse gases such as CO 2 have been increasing in the atmosphere, which induced global climate anomaly [ 1] . CO 2 flooding is considered one of the most promising methods for commercial application, which could not only improve our environment but enhance oil recovery [2,3] .…”