Measurement device, measurement method, and carbon dioxide recovery system

A measurement method of measuring components of an organic solution in which an inorganic gas has been dissolved by a measurement device that includes a gasification unit, an organic gas retention unit, a flow passage switching unit, an inorganic gas separation unit, an organic gas separation unit, and a detection unit,

• wherein the gasification unit gasifies the organic solution and discharges the gasified organic solution together with a carrier gas,
• the organic gas retention unit retains an organic gas contained in the gas discharged from the gasification unit and allows an inorganic gas to pass therethrough at a first temperature,
• the inorganic gas separation unit separates inorganic components contained in the inorganic gas, which has passed through the organic gas retention unit, and discharges the inorganic components, at a third temperature that is higher than the first temperature and lower than a second temperature where the organic gas retention unit discharges the retained organic gas,
• the detection unit detects the inorganic components discharged from the inorganic gas separation unit,
• the organic gas retention unit discharges the organic gas at the second temperature,
• the organic gas separation unit separates organic components contained in the organic gas discharged from the organic gas retention unit, and discharges the organic components, and
• the detection unit detects the organic components discharged from the organic gas separation unit.

A carbon dioxide recovery system comprising:

• an absorption tower that allows carbon dioxide contained in a combustion exhaust gas to be absorbed in an absorbent solution and discharges the absorbent solution containing carbon dioxide;
• a regeneration tower that is supplied with the absorbent solution discharged from the absorption tower, removes a carbon dioxide gas containing steam from the absorbent solution, regenerates the absorbent solution, and discharges the absorbent solution;
• a regenerative heat exchanger that is provided between the absorption tower and the regeneration tower and heats the absorbent solution, which is discharged from the absorption tower and supplied to the regeneration tower, by using an absorbent solution, which is discharged from the regeneration tower and supplied to the absorption tower, as a heat source;
• a densimeter that measures the density of an absorbent solution discharged from the absorption tower or an absorbent solution discharged from the regeneration tower;
• a gasification unit that gasifies a unit of the absorbent solution and discharges the gasified absorbent solution together with a carrier gas;
• an organic gas retention unit that is supplied with a gas discharged from the gasification unit, retains an organic gas and allows an inorganic gas to pass therethrough at a first temperature, and discharges the retained organic gas at a second temperature higher than the first temperature;
• an inorganic gas separation unit that separates inorganic components contained in the inorganic gas having passed through the organic gas retention unit, and discharges the inorganic components;
• an organic gas separation unit that separates organic components contained in the organic gas discharged from the organic gas retention unit, and discharges the organic components;
• a detection unit that detects the inorganic components discharged from the inorganic gas separation unit and the organic components discharged from the organic gas separation unit;
• and
• a control unit that controls the amount of an absorbent solution which is discharged from the absorption tower and returns to the absorption tower or the amount of an absorbent solution which is discharged from the regeneration tower and returns to the regeneration tower on the basis of the density measured by the densimeter and detection results of the detection unit.

A carbon dioxide recovery system comprising:

• a gas temperature controller that adjusts the temperature of a combustion exhaust gas and discharges the combustion exhaust gas;
• an absorption tower that allows carbon dioxide contained in the combustion exhaust gas discharged from the gas temperature controller to be absorbed in an absorbent solution and discharges the absorbent solution containing carbon dioxide;
• a regeneration tower that is supplied with the absorbent solution discharged from the absorption tower, removes a carbon dioxide gas containing steam from the absorbent solution, regenerates the absorbent solution, and discharges the absorbent solution;
• a regenerative heat exchanger that is provided between the absorption tower and the regeneration tower and heats the absorbent solution, which is discharged from the absorption tower and supplied to the regeneration tower, by using an absorbent solution, which is discharged from the regeneration tower and supplied to the absorption tower, as a heat source;
• a densimeter that measures the density of an absorbent solution discharged from the absorption tower;
• a gasification unit that gasifies a unit of the absorbent solution and discharges the gasified absorbent solution together with a carrier gas;
• an organic gas retention unit that is supplied with a gas discharged from the gasification unit, retains an organic gas and allows an inorganic gas to pass therethrough at a first temperature, and discharges the retained organic gas at a second temperature higher than the first temperature;
• an inorganic gas separation unit that separates inorganic components contained in the inorganic gas having passed through the organic gas retention unit, and discharges the inorganic components;
• an organic gas separation unit that separates organic components contained in the organic gas discharged from the organic gas retention unit, and discharges the organic components;
• a detection unit that detects the inorganic components discharged from the inorganic gas separation unit and the organic components discharged from the organic gas separation unit;
• and
• a control unit that calculates first and second thresholds on the basis of the detection results of the detection unit, performs a control so as to lower the set temperature of the gas temperature controller when the density is lower than the first threshold, and performs a control so as to raise the set temperature of the gas temperature controller when the density is higher than the second threshold.

A carbon dioxide recovery system comprising:

• an absorption tower that allows carbon dioxide contained in a combustion exhaust gas to be absorbed in an absorbent solution and discharges the absorbent solution containing carbon dioxide;
• a regeneration tower that is supplied with the absorbent solution discharged from the absorption tower, removes a carbon dioxide gas containing steam from the absorbent solution, regenerates the absorbent solution, and discharges the absorbent solution;
• a reboiler that heats a unit of an absorbent solution stored in the regeneration tower;
• a regenerative heat exchanger that is provided between the absorption tower and the regeneration tower and heats the absorbent solution, which is discharged from the absorption tower and supplied to the regeneration tower, by using an absorbent solution, which is discharged from the regeneration tower and supplied to the absorption tower, as a heat source;
• a densimeter that measures the density of an absorbent solution discharged from the regeneration tower;
• a gasification unit that gasifies a unit of the absorbent solution and discharges the gasified absorbent solution together with a carrier gas;
• an organic gas retention unit that is supplied with a gas discharged from the gasification unit, retains an organic gas and allows an inorganic gas to pass therethrough at a first temperature, and discharges the retained organic gas at a second temperature higher than the first temperature;
• an inorganic gas separation unit that separates inorganic components contained in the inorganic gas having passed through the organic gas retention unit, and discharges the inorganic components;
• an organic gas separation unit that separates organic components contained in the organic gas discharged from the organic gas retention unit, and discharges the organic components;
• a detection unit that detects the inorganic components discharged from the inorganic gas separation unit and the organic components discharged from the organic gas separation unit;
• and
• a control unit that calculates first and second thresholds on the basis of the detection results of the detection unit, performs a control so as to lower the set temperature of the reboiler when the density is lower than the first threshold, and performs a control so as to raise the set temperature of the reboiler when the density is higher than the second threshold.