CIESC Journal ›› 2019, Vol. 70 ›› Issue (1): 261-270.doi: 10.11949/j.issn.0438-1157.20180567

• Energy and environmental engineering • Previous Articles     Next Articles

A waste heat recovery power generation system combined with natural gas liquefaction and CO2 capture

Li ZHANG1(),Wenwu WANG1(),Zhi’en ZHANG2,Peisheng LIU3,Jiangbo WEN4,Liang DONG1   

  1. 1. College of Petroleum Engineering, Liaoning Shihua University, Fushun 113001, Liaoning, China
    2. School of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 400054, China
    3. School of Computer and Communication Engineering, Liaoning Shihua University, Fushun 113001, China
    4. School of Petroleum Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, Guangdong, China
  • Received:2018-05-28 Revised:2018-10-10 Online:2019-01-05 Published:2018-10-25
  • Contact: Wenwu WANG E-mail:zhanglili1229@hotmail.com;41116521@qq.com

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Abstract:

Aiming at the problem of waste heat recovery and energy utilization, LNG and heavy oil extraction exhaust gas are used as cold source and heat source respectively, and a waste heat recovery and utilization system combined with natural gas liquefaction and exhaust gas power generation and CO2 capture is proposed. The effect of key parameters on thermodynamic performance is evaluated. The results show that increasing the turbine inlet temperature, decreasing of turbine outlet pressure and in the compression ratio, have a positive effect on the organic Rankine cycle and refrigeration cycle. The maximum net output power and waste heat recovery efficiency are 454.9 kW and 34.2%, respectively. For the natural gas liquefaction system, the nonlinear optimization of natural gas liquefaction cycles was calculated by using C++. The total power consumption within the nitrogen expansion refrigeration compressors has been selected as the objective function. The nonlinear constrained optimization problem of the liquefaction process is constructed. The optimal total power consumption of the compressors is 101.54 kW. The gas peak load regulation can be taken by decreasing the natural gas compressor (K110) inlet temperature, nitrogen turbine (T3) outlet pressure and its mass flow rate; the maximum value is 378.8 kg/h. On the contrary, the volume of carbon dioxide captured can be increased by 28.6%.

Key words: natural gas, liquefaction, power generation, CO2 capture, optimization

CLC Number: 

  • TE 09

Fig.1

Schematic diagram of proposed system"

Table 1

Basic parameters of system"

ItemValue
exhaust gas inlet temperature/℃260
exhaust gas inlet pressure/kPa110
mass flow rate of exhaust gas/(kg/h)20000
ambient temperature/℃35
ambient pressure/kPa101
LNG inlet temperature/℃-162
LNG inlet pressure/kPa110
mass flow rate of LNG/(kg/h)15000
natural gas supply temperature/℃10—20
amount of LNG liquefaction/(kg/h)10000

Table 2

Condensation temperature of common working fluid (110 kPa)"

Working fluidCondensation temperature/℃
R1150-102.7
R170-87.2
R32-50.1
R1270-46.2
R143a-45.4
R290-40.3
R134a-24.3
R152a-22.7

Fig.2

Effects of turbine 1 inlet temperature and evaporation pressure on performance parameters in power generation system"

Fig.3

Effects of compression ratio on cold exergy recovery efficiency in refrigeration cycle"

Fig.4

Effects of compressor K110 outlet pressure on power consumption in natural gas liquefaction cycles"

Fig.5

Effects of compressor K110 inlet temperature on performance parameters in natural gas liquefaction cycles"

Fig.6

Effects of CO2 captured pressure on performance parameters in natural gas liquefaction cycles"

Fig.7

Effects of mass flow rate of nitrogen on performance parameters in natural gas liquefaction system"

Fig.8

Effects of turbine 3 outlet pressure on performance parameters in natural gas liquefaction system"

Table 3

Key parameters of nitrogen expansion refrigeration circulation"

ItemPre-optimization resultsOptimization results
compressor K112 outlet pressure/kPa900909
compressor K112 inlet temperature/℃2018
compressor K113 outlet pressure/kPa12001172
compressor K114 outlet pressure/kPa15001500
compressor total power consumption/kW120101.54

Fig.9

Comparison of waste heat recovery efficiency with/without liquefaction system"

Table 4

Optimal calculation results of the whole system"

ItemMaximum valueItemMaximum value
net output power in SAGD/ORCCO2 captured quantityLNG used to peak regulation
evaporation temperature/℃190compressor K110 inlet temperature/℃-10-100
turbine 1 outlet pressure/kPa200compressor K110 outlet pressure/kPa360360
compressor outlet pressure/kPa200turbine 5 outlet pressure/kPa700110
net output power/kW454.9nitrogen mass flow rate/(kg/h)40001000
thermal efficiency/%36.6CO2 compressor outlet pressure/kPa600600
exergy efficiency/%31.4LNG used to peak regulation/(kg/h)192.8378.8
waste heat recovery efficiency/%34.2CO2 captured quantity/%7546.4
ηcold in refrigeration cycle/%87.7net output power/kW29.1267.5
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