TECHNICAL FIELD
The present invention relates to a circulation blowing method and system of a steam-driven.coke dry quencher (in the present specification, referred to as a "CDQ") in a circulation system of circulated gas of a CDQ which switch between steam generated in a boiler and steam supplied from a steam supply source for use as a drive source of a circulation blower.
BACKGROUND ART
In a CDQ, red hot coke is loaded into a prechamber of a CDQ body and lowered to a cooling chamber, cooling gas comprised of an inert gas supplied to the cooling chamber is heat exchanged with the red hot coke, the high temperature inert gas recovering the heat of the red hot coke is introduced to a boiler for heat exchange, then a circulation blower is used to again send it under pressure to the cooling chamber for circulation. The steam obtained by the heat exchange at the boiler is mainly sent to a generator and recovered as electrical energy.
To drive the circulation blower for sending the inert gas under pressure, for example, as described in Japanese Unexamined Patent Publication (A) No. 57-190079, a steam turbine utilizing part of the steam generated at a boiler is utilized. At the time of startup, steam for driving the steam turbine cannot be obtained, so the inert gas is blown by a separately provided electrically driven small sized circulation blower driven by a small sized motor. When a predetermined amount of steam is generated, the circulation blower is operated driven by a steam turbine.
However, when employing a circulation blower driven by a steam turbine, there are the problems that

facilities are required for sending the inert gas under pressure by an electrically driven small sized circulation blower at the time of startup until a predetermined amount of steam is generated and the system becomes complicated.
DISCLOSURE OF INVENTION
The present invention provides a CDQ circulation blowing method able to start up without using an electrically driven small sized circulation blower at the time of startup, but using a circulation blower driven by a steam turbine used in steady operation, and a circulation blowing system simplified in facilities.
The CDQ circulation blowing method of the present invention provides a CDQ circulation blowing method performing heat exchange between red hot coke charged into a CDQ body and an inert gas introduced from below said CDQ body, recovering the latent heat of the inert gas after heat exchange in a boiler, and introducing the inert gas cooled by recovery of its latent heat in the boiler into the CDQ body again for circulation, characterized by making steam the drive source for driving said circulation blower, introducing steam from a separately provided steam supply source when starting up the CDQ, and introducing steam from a bypass pipe branched off from a steam pipe from the boiler after the CDQ finishes starting up.
The CDQ circulation blowing system of the present invention provides a CDQ circulation blowing system performing heat exchange between red hot coke charged into a CDQ body and an inert gas introduced from below said CDQ body, recovering the latent heat of the inert gas after heat exchange in a boiler, and introducing the inert gas cooled by recovery of its latent heat in the boiler into the CDQ body again for circulation, characterized by branching off a bypass pipe supplying steam to a steam turbine for driving a circulation blower from a steam pipe from said boiler and connecting a steam

feed pipe supplying steam from a separately provided steam supply source to said steam pipe.
BRIEF DESCRIPTION OF Accompanying DRAWINGS
FIG. 1 is a flow chart of an example of a CDQ circulation blowing system of the present invention.
FIG. 2 is a graph showing the relation between the rise of the temperature of the inert gas and time.
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a flow chart of an example of a CDQ circulation blowing system of the present invention. The top of a CDQ body 1 charged with red hot coke and heat exchanging it with a cooling gas comprised of an inert gas for cooling is connected to a boiler 4 by an exhaust duct 3 provided with a dust collector 2. Further, the boiler 4 is connected to the bottom of the CDQ body 1 by circulation ducts 6, 7 through a circulation blower 5. Due to this, an inert gas circulation path is formed where the high temperature inert gas heat exchanged with the red hot coke in the CDQ body 1 is exhausted from the CDQ body 1, passes through the exhaust duct 2 to be introduced to the boiler 4, is cooled by heat exchange, passes through the circulation ducts 6, 7 by the circulation blower 5, and is then introduced to the CDQ body 1.
The boiler 4 is provided with heat exchanger tubes 8. The heat exchanger tubes 8 are supplied with water from water pipes 10, 11 connected to a tank 9 by a water pump 12. The water flowing into the heat exchanger tubes 8 is heat exchanged with the high temperature inert gas exhausted from the CDQ body 1 to the boiler 4 and becomes steam. The steam is .sen*" through a steam pipe 13 connected to the heat exchanger tubes 8 to be sent to a power generation racils retity 14. The steam leaving the power generation facility 14 iurned to water by a condenser 15 and flows into the tank 9.
The circulation blower 5 is driven by a steam turbine 16. The steam turbine 16 is driven by steam

supplied through a bypass pipe 17 branched off from the steam pipe 13.
The steam pipe 13 has connected to it a separate steam supply source 18, a shut-off valve 19, and a steam feed pipe 20 for feeding steam to a steam turbine 16 for driving the circulation blower 5 at the time of startup of the CDQ body 1. The steam feed pipe 20 supplies steam from the steam supply source 18 to the bypass pipe 17 by connecting a switch valve 21 provided at the boiler 4 side of the steam pipe 13 and a shut-off valve 22 provided at the power generation facility 14 side. Further, the steam pipe 13 has connected to it, between the switch valve 21 and the boiler 4 side, a blow-off pipe 24 provided with a blow-off valve 23 for blowing off the steam.
The low pressure steam from the steam turbine 16 driving the circulation blower 5 is sent from a low pressure steam pipe 25 to a material drying device 26, is utilized for drying the material, and is cooled to become water. The water is returned to the tank 9.
Next, the operation of the CDQ of the present invention will be explained. At the time of startup of the CDQ, the switch valve 21 and shut-off valve 22 of the exhaust pipe 13 are closed and the blow-off valve 23 is opened. If after this the shut-off valve 19 of the steam feed pipe 20 is opened, steam passes from the steam supply source 18 through the steam feed pipe 20, steam pipe 13, and bypass pipe 17 to drive the steam turbine 16. The low pressure steam exhausted from the steam turbine 16 is cooled and becomes water which is returned to the tank 9. The water is introduced from the tank 9 through the water pipes 10, 11 to the heat exchanger tubes 8, becomes steam, passes through the steam pipe 13, and is blown off from the blow-off pipe 24.
At the time of startup in this way, the supply of steam from the steam supply source 18 is used to drive the steam turbine 16 and turn the circulation blower 5 so

as to send the inert gas into the CDQ body 1 for heat exchange with the red hot coke. The inert gas is exhausted from the CDQ body 1, passes through the exhaust duct 3, is introduced to the boiler 4, is cooled by the heat exchange, passes through the circulation ducts 6 and 7 by the circulation blower 5, and is introduced into the CDQ body 1. FIG. 2 is a graph showing the relation between the rise of the temperature of the inert gas and the time. As the circulation blower repeatedly circulates the inert gas through the inert gas circulation path, as shown by the graph of FIG. 2, the temperature of the inert gas rises. The temperature of the steam also rises along with time. When the temperature of the inert gas rises to about 800°C, the temperature of the steam generated from the heat exchanger tubes 8 rises and the amount of steam required for the steam turbine 16 and power generation facility 14 is generated. At this point of time, if opening the switch valve 21 and shut-off valve 22 of the steam pipe 13, closing the blow-off valve 23, and closing the shut off valve 19 of the steam feed pipe 20, the steam of the heat exchanger tubes 8 passes through the steam pipe 13 to flow into the power generation facility 14. Part passes through the bypass pipe 17 to drive the steam turbine 16, turn the circulation blower 5, and circulate the inert gas.
INDUSTRIAL APPLICABILITY
Since a single circulation blower is shared at the time of startup and at the time of steady operation after completion of startup, no circulation blower is required especially for startup and the facilities are simplified compared with the past.

WE CLAIM:

1. A CDQ circulation blowing method performing heat exchange between
red hot coke charged into a CDQ body and an inert gas introduced from below
said CDQ body, recovering the latent heat of the inert gas after heat exchange
in a boiler, and introducing the inert gas cooled by recovery of its latent heat in
the boiler into the CDQ body again for circulation,
said CDQ circulation blowing method characterized by comprising the steps of;
making steam the drive source for driving said circulation blower,
introducing steam from a steam supply source through separately provided a bypass pipe branched off from the boiler through a steam pipe connected to the boiler when starting up the CDQ,
and introducing steam from the bypass pipe branched off from the steam pipe from the boiler after the CDQ finishes starting up.
2. A CDQ circulation blowing apparatus for carrying out the method as
claimed in claim 1, performing heat exchange between red hot coke charged
into a CDQ body and an inlet gas introduced from below said CDQ body,
recovering the latent heat of the inert gas after heat exchange in a boiler, and
introducing the inert gas cooled by recovery of its latent heat in the boiler into
the CDQ body again for circulation,
characterized in that said CDQ circulation blowing apparatus comprising a bypass pipe branched off from a steam pipe for supplying steam to a steam turbine for driving a circulation blower from said boiler, and a steam feed pipe connected to said steam pipe for supplying steam from a separately provided steam supply source.