1. A carbon dioxide recovery system, comprising:
a high-pressure turbine, an intermediate-pressure turbine, and a low-pressure turbine;
a boiler for producing steam to drive the turbines;
a carbon dioxide recovery unit including a carbon dioxide absorber for allowing a carbon dioxide absorbent to absorb and reduce carbon dioxide in a combustion flue gas discharged from the boiler and a carbon dioxide regenerator for regenerating the carbon dioxide absorbent having absorbed carbon dioxide as a regenerated carbon dioxide absorbent;
a first steam line through which low-pressure steam is fed from the intermediate-pressure turbine to the low-pressure turbine;
a second steam line into which the low-pressure steam is branched from the first steam line;
a first regulation valve disposed on the first steam line to regulate an opening of an amount of steam of the low-pressure steam from 100% to 0%;
a second regulation valve disposed on the second steam line to regulate an opening of an amount of steam of the low-pressure steam from 0% to 100% depending on the amount of control provided to the first regulation valve;
a first auxiliary turbine coupled to the second steam line to recover power using the low-pressure steam being fed;
a first steam feed line through which exhaust steam discharged from the first auxiliary turbine is employed to be fed as a source of heat to a reboiler which is used to regenerate the carbon dioxide absorbent having absorbed carbon dioxide in the carbon dioxide regenerator;
a bleed line through which the low-pressure steam having been bled from the first auxiliary turbine is fed to the low-pressure turbine; and
a control device configured to control driving of the first auxiliary turbine by controlling an opening from 100% to 0% and from 0% to 100% in carbon dioxide recovery and non-recovery modes in response to a variation in operation load of the boiler or the turbines while a pressure of the exhaust steam supplied to the reboiler is maintained to take on a permissible value for a reboiler optimum pressure (about 0.33 MPa\xb10.05 MPa) with the first regulation valve and the second regulation valve being operated in response to each other.
2. A carbon dioxide recovery method including using the carbon dioxide recovery system according to claim 1 to recover carbon dioxide which has been absorbed in the carbon dioxide absorbent.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A milling cutter comprising:
a cutting portion comprising:
a depression portion; and
a sidewall surrounding the depression portion;
wherein an exterior surface of the side wall is a cylindrical surface, at least a part of an internal surface of the side wall is a slanted surface, so as to form at least one tooth.
2. The milling cutter as claimed in claim 1, wherein the cutting portion is a cylinder with a free end aslant cut off by a virtual plane to form a slanted and elliptical cutting edge, and the depression portion is defined in the free end.
3. The milling cutter as claimed in claim 1, wherein a tooth angle is defined between the exterior surface and the internal surface, the tool angle is between 10 degrees and 30 degrees.
4. The milling cutter as claimed in claim 3, wherein the tool angle is 20 degree.
5. The milling cutter as claimed in claim 1, further comprising a shank for holding and locating the milling cutter and a neck for connecting the cutting portion to the shank.
6. The milling cutter as claimed in claim 1, wherein the cutting portion is a cylinder with a free end cut off by two virtual surface whose sectional view is V-shaped to form two tooth symmetrical with each other, and the depression portion is defined in the free end.