Nowadays

the CCUS industry is developing rapidly worldwide

of which the projects are gradually turning from single-section items to whole-industry ones. The target of capture has expanded from power plants and natural gas processing to steel

cement

kerosene

fertilizers and hydrogen production. At present

there are five major ways to drive the industry: government and public funds

national incentive policies

taxation

mandatory emission reduction policies and carbon trading. In China

the CO

2

emitting enterprises are mainly power plants

cement

steel and coal chemicals

accounting for 92 % of the total emissions. According to the concentration

the low concentration CO

2

emission sources are mainly from power plants

cement

steel and refining and chemical industries

that with high concentration are mainly from coal chemical industry

synthetic ammonia and calcium carbide

and that with medium concentration is mainly from the polyethylene industry. The first are the majority

while the latter two are relatively few. Costs of CO

2

sources are comprised of three main parts: capture cost

compression cost and transportation cost

all of which are affected by the scale of capture. Meanwhile

the cost of capture is also related to the concentration of emission source. For the type of high CO

2

concentration

the expense of compression takes the lead in accounting. And capture cost is for the low CO

2

concentration type. As the tolerance of CO

2

cost is lower than source cost for most oilfields

it is necessary to seek ways like technology

policies or markets to fill the gap and promote the sustainable development.