the coking properties of coal at elevated pressures. - Argonne ...
the coking properties of coal at elevated pressures. - Argonne ... the coking properties of coal at elevated pressures. - Argonne ...
demonstration plant is also running. Organization To carry out this project effectively, the pilot plant program Steering Committee was organized by The Coal Mining Research Center, Electric Power Development Co., Kawasaki Heavy Industries, Ltd. and Babcock-Hitachi K.K. As a sub-committee of the Steering Committee, the Pilot Plant Executive Office was organized. This Office has taken charge of the construction, test and operation of the pilot plant. Wakamatsu Pilot Plant Test Items The planned pilot plant test items are as follows: (1) NOx and SOX emission control (2) Reduction of the required quantity of desulfurizing sorbent (3) Controllability of the fluidized bed boiler (4) Reliability of the fluidized bed boiler (5) Suitable types of coal (6) Performance of the dust collector 2. 20 t/h Pilot Plant Basic Concepts -_ The fluidized bed boiler consists of a main bed cell (MBC) and a carbon burn-up cell (CBC). The design was made so that various imported coals and low grade coals can be burned. Crushed coal has been used as a feed coal. Before feeding, the coal is pretreated-drying, crushing screening, etc. Coal feeding is done by both pneumatic feeders and overbed spreaders. Fine grain coal is fed to the bottom of the bed through a pneumatic conveyer and coarse grain coal sprinkled over the fluidized bed by a spreader. The capacity of the feeders are designed so that total required quantity of coal can be fed by one of these two method. Natural limestone whose sizing has been completed at the mine is used as a desulfurizing sorbent. conveyor. The sorbent is fed through a pneumatic A multi-cyclone is installed at the outlet of the MBC. The design was made so that the collected coal ash can be reburned either in MBC or CBC. A balanced draft systems is used. MBC was designed so that it can be diveded into two parts. The installation position of heat exchange tubes in the free board of MBC can be changed. The duct connected to the rear flue can be removed so that the height of free board can be changed. Hot stoves and over bed burners are used for starting up the boiler. Steam generated by the boiler is changed back to water by an air condenser. The water can be reused. Discharged ash is wetted and transferred to the ash yard to be discarded. 190
After the fiscal year 1982, the following expansion or modification will be made. A. A sorbent regeneration unit: applicable for both limestone and synthetic sorbent. B. A new dust - collector for testing is planned for the dust discharge quantity 10 mg/Nm3, and for the gas flow rate of approximately 1,000 Nm3/h. Design Conditions (1) Main boiler specification Boiler type: Natural and forced circulation type drum boiler; indoor type. Evaporation: 20 t/h Steam pressure: 60 kg/cm2 G at the outlet of the superheater Steam temperature: 54OOC at the outlet of the superheater Feedwater temperature: 133°C at the inlet of the fuel economizer Boiler efficiency: 87.37% (high calorific value base) Fuel consumption: 2,450 kg/h (wet coal base) Fuel calorific value: 7,100 kcal/kg (high heating value for dry coal. ) 6,603 kcal/kg (high heating value for wet coal Combustion flue gas: 20,293 rIm3/h (wet) (2) Target value of emission control SOX: 95% desulfurization for coal containing 3% S NOx: 60 ppm for coal containing 1% N and 02 6% equivalent. (3) Properties of planned coal: Refer to Table 2. (4) Desulfurizing sorbent: natural limestone an< synthetic sorbent -~ Plant Outline (1) Boiler Fig. 1 shows a section of the boiler elevation. The MBC consists of the combustion furnace which is composed of a natural circulation membrane structure water wall and the refactory wall rear flue. In the fluidized bed with a 2.17 m x 4.34 m area, the forced circulation type evaporator by a boiler circulating water pump and the primary and secondary superheaters are installed. The fluidized bed is divided into two parts so that one side operation can be done. Outside the bed, the evaporator and flue economizer are installed. This evaporator, as shown in Fig. 2, can be removed to the free board of the combustion furnace or rear flue. This, together with a change in the installation level of the duct connecting to the rear flue, enables the test for a change in free board conditions. In the free board of the combustion furnace, double stage combustion air feeding ports (8 rows x 5 stages) are installed to enable various comparison tests to be conducted. CBC is composed of a natural circulation water wall (0.91 m x 0.91 m). In the free board of the CBC, a fuel economizer is 191
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demonstr<strong>at</strong>ion plant is also running.<br />
Organiz<strong>at</strong>ion<br />
To carry out this project effectively, <strong>the</strong> pilot plant program<br />
Steering Committee was organized by The Coal Mining Research Center,<br />
Electric Power Development Co., Kawasaki Heavy Industries, Ltd. and<br />
Babcock-Hitachi K.K. As a sub-committee <strong>of</strong> <strong>the</strong> Steering Committee, <strong>the</strong><br />
Pilot Plant Executive Office was organized. This Office has taken<br />
charge <strong>of</strong> <strong>the</strong> construction, test and oper<strong>at</strong>ion <strong>of</strong> <strong>the</strong> pilot plant.<br />
Wakam<strong>at</strong>su Pilot Plant Test Items<br />
The planned pilot plant test items are as follows:<br />
(1) NOx and SOX emission control<br />
(2) Reduction <strong>of</strong> <strong>the</strong> required quantity <strong>of</strong> desulfurizing sorbent<br />
(3) Controllability <strong>of</strong> <strong>the</strong> fluidized bed boiler<br />
(4) Reliability <strong>of</strong> <strong>the</strong> fluidized bed boiler<br />
(5) Suitable types <strong>of</strong> <strong>coal</strong><br />
(6) Performance <strong>of</strong> <strong>the</strong> dust collector<br />
2. 20 t/h Pilot Plant<br />
Basic Concepts<br />
-_<br />
The fluidized bed boiler consists <strong>of</strong> a main bed cell (MBC) and<br />
a carbon burn-up cell (CBC). The design was made so th<strong>at</strong> various<br />
imported <strong>coal</strong>s and low grade <strong>coal</strong>s can be burned.<br />
Crushed <strong>coal</strong> has been used as a feed <strong>coal</strong>. Before feeding, <strong>the</strong><br />
<strong>coal</strong> is pretre<strong>at</strong>ed-drying, crushing screening, etc. Coal feeding is<br />
done by both pneum<strong>at</strong>ic feeders and overbed spreaders.<br />
Fine grain <strong>coal</strong> is fed to <strong>the</strong> bottom <strong>of</strong> <strong>the</strong> bed through a pneum<strong>at</strong>ic<br />
conveyer and coarse grain <strong>coal</strong> sprinkled over <strong>the</strong> fluidized bed by a<br />
spreader. The capacity <strong>of</strong> <strong>the</strong> feeders are designed so th<strong>at</strong> total<br />
required quantity <strong>of</strong> <strong>coal</strong> can be fed by one <strong>of</strong> <strong>the</strong>se two method.<br />
N<strong>at</strong>ural limestone whose sizing has been completed <strong>at</strong> <strong>the</strong> mine is used<br />
as a desulfurizing sorbent.<br />
conveyor.<br />
The sorbent is fed through a pneum<strong>at</strong>ic<br />
A multi-cyclone is installed <strong>at</strong> <strong>the</strong> outlet <strong>of</strong> <strong>the</strong> MBC. The design<br />
was made so th<strong>at</strong> <strong>the</strong> collected <strong>coal</strong> ash can be reburned ei<strong>the</strong>r in MBC<br />
or CBC.<br />
A balanced draft systems is used.<br />
MBC was designed so th<strong>at</strong> it can be diveded into two parts. The<br />
install<strong>at</strong>ion position <strong>of</strong> he<strong>at</strong> exchange tubes in <strong>the</strong> free board <strong>of</strong> MBC<br />
can be changed. The duct connected to <strong>the</strong> rear flue can be removed so<br />
th<strong>at</strong> <strong>the</strong> height <strong>of</strong> free board can be changed.<br />
Hot stoves and over bed burners are used for starting up <strong>the</strong><br />
boiler. Steam gener<strong>at</strong>ed by <strong>the</strong> boiler is changed back to w<strong>at</strong>er by an<br />
air condenser. The w<strong>at</strong>er can be reused. Discharged ash is wetted and<br />
transferred to <strong>the</strong> ash yard to be discarded.<br />
190
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