NOVELTY - The method involves installing carbon dioxide recovery unit (10) in the combustion exhaust gas line. An absorption tower is provided for absorbing the carbon dioxide into an absorbing solution. A regeneration tower is provided for separating and recovering the carbon dioxide present in the absorbing solution from the absorption tower and circulating the treated absorbing solution to the absorption tower. The steam is supplied to the regeneration tower. A plant component is provided for discharging low-pressure steam at specific pressure.    USE - Method for recovering carbon dioxide in plant such as urea plant, ammonia plant, methanol plant and dimethyl ether plant. Can also be used in thermal power plant and chemical plant.    ADVANTAGE - The manufacturing cost is reduced due to construction of a new boiler and an increase in the carbon dioxide emission reduction energy penalty. The utilization efficiency of energy is increased, and energy loss of the low-pressure steam is significantly reduced. The concentration of carbon dioxide in combustion exhaust gas is substantially reduced by the carbon dioxide recovery unit. The efficient utilization of the recovered carbon dioxide and reduction of energy loss is achieved. The steam flow rate of the high-pressure steam to be supplied to the steam turbine is increased.    DETAILED DESCRIPTION - The low-pressure steam is supplied from the plant component to the reboiler of the carbon dioxide recovery unit. The low pressure stream discharge urea plant (11), an ammonia plant, a methanol plant and a dimethyl ether plant. The supplied carbon dioxide is recovered by the carbon dioxide recovery unit to a raw material supply line (21) of the plant component. The carbon dioxide is discharged from the ammonia plant, while supplying the compressed carbon dioxide to the urea plant. A storage line is connected to enhanced oil recovery facility and an underground carbon dioxide storage facility.    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic block diagram of the chemical plant.    Carbon dioxide recovery unit (10)    Urea plant (11)    Raw material supply line (21)    Chemical plant (100)    Boiler (B)