RECOVERY METHOD AND RECOVERY APPARATUS OF CARBON DIOXIDE

摘要

The carbon dioxide recovery method and apparatus are capable of reducing regeneration energy and operating cost, and structurally advantageous. An absorber has first and second absorbing sections where a gas is supplied through the first absorbing section to the second absorbing section. A regenerator has first and second regenerating sections. The first regenerating section has an external heater and the second regenerating section is heated by the gas discharged from the first regeneration section. The absorbing liquid circulates between the second absorbing section and the first regenerating section in a circulation system, and a branch system allows a part of the absorbing liquid to flows from the second absorbing section through the first absorbing section and the second regenerating section successively to the first regenerating section. The recovery gas discharged is compressed, and its heat is recovered and supplied to the regenerator by heat exchange with the absorbing liquid.

主权项

1. A carbon dioxide recovery apparatus, comprising:
an absorber which brings a gas into contact with an absorbing liquid and to allow the absorbing liquid to absorb carbon dioxide contained in the gas, the absorber having a first absorbing section and a second absorbing section which are arranged to supply the gas through the first absorbing section into the second absorbing section; a regenerator which regenerate the absorbing liquid by heating the absorbing liquid having carbon dioxide absorbed in the absorber to cause the absorbing liquid to release the carbon dioxide, the regenerator having a first regenerating section having an external heating implement and a second regenerating section being arranged to be heated by heat from gas discharged from the first regenerating section; a circulation mechanism comprising a circulation system to circulate the absorbing liquid between the second absorbing section and the first regenerating section, and a branch flow system branched from the circulation system to cause a part of the absorbing liquid circulated in the circulation system to be directed from the second absorbing section toward the first regenerating section through the first absorbing section and the second regenerating section; a compressor which directly compresses a recovery gas discharged from the regenerator and containing carbon dioxide and steam; and a heat recovery system which recovers heat of the recovery gas compressed by the compressor and supplies the heat to the regenerator.