Take consideration of the process flow, layout, power supply and distribution, and water supply of the clinker production lines, by utilizing the heat resource exhausted from the pre heater and cooler, one 7500kw pure low temperature waste heat power station is appropriate for the 2*2500t/d clinker production line.
2*2500t/d cement production lines kiln outlet cooler waste heat condition after reformation will be 2*65000Nm3/h-350�? The waste gas will be introduced into the kiln outlet waste heat boiler(AQC boiler) for power generation; Outlet waste gas of the AQC boiler will be introduced into the existing kiln outlet EP.
Kiln inlet five-stage pre heater waste gas condition will be 2*150000Nm
3/h-340�?/DIV>
The waste gas will be introduced into the kiln inlet waste heat boiler (SP boiler) for power generation and the exhausted gas temperature should be higher than 220℃for raw mill or coal mill drying.
2. Power supply and connection system solution
At the beginning of the power station putting into production, 300~500kw start-up power supply is necessary which will be supplied by the general substation. After the generation putting into production, the generator will be connected to outside power network by general substation 6(10) kV. The power station and the existing system will be connected to the outside power network, but not feed power to it. The power consumption of the station will be supplied general substation or generator.
In order to make sure the power station run in reason and smoothly, a high & low voltage distribution room should be plotted on the side of the main building.
As the waste heat power station of the company, the generation power should be fed to the cement production line. The power station and the existing system will be connected to outside power network, but not feed power to it. Connection synchronous points will be set at generation liaison switch and generator outlet switch.
3. Water supply
Since the average production and domestic water consumption will be about 1800m3/d, the water supply capacity should be 2200m3/d.
Technical safeguard condition
Thermodynamic system
According to the process flow and design parameter of 2*2500t/d cement production lines, adopting China institutes and manufacturers pure low temperature waste heat recovery technique and Chinese made equipments, the power generation amount per ton clinker can achieve 36~38kwh..
Brief introduction of technical solution
Two kiln outlet waste heat boilers-AQC boilers
The AQC boiler is arranged between cooler middle stage and the existing kiln outlet EP. The heat-receiving surface of the AQC boiler is divided into two stages: the first stage produces steam, and the second stage produces hot water. The saturation water of 135�?will be feed to the AQC boiler steam stage and kiln inlet waste heat boiler(hereinafter called SP boiler); 1.6 MPa superheated steam produced in AQC boiler steam stage and SP boiler merges together and is introduced to a turbine for power generation. Condensing water of the turbine is pumped to AQC boiler hot water stage..
Two kiln inlet waste heat boilers-SP boilers
The SP boiler is at the outlet of pre heater. The superheated steam produced in SP boiler and AQC boiler steam stage merges together and is introduced to a turbine foe power generation.
One condensing steam turbine is adopted to match the low temperature waste heat power station
A Chinese-made condensing steam turbine is adopted, rated power is 4500kw, and initial steam parameter is 1.27Mpa-290�?/DIV>
One generator os selected to match the condensing turbine
One normal 6(10)kv AC generator with 7500kw rated power is adopted, which will be connected to outside power network by general substation 6(10)kv.
Circulation cooling water system will be adopted for meeting the cooling water demand of the power station.
4.2.6A"Filter+demineralizing" system is adopted as chemical water treatment for meeting the boiler water criterion.
DCS computer control system is adopted for monitoring the power station sunning.
4.3 Main equipment
No |
Equipment name and model |
Quantity |
Main technical spec. |
1 |
Condensing steam turbine |
1 |
Rated power: 7.5MW
Initial steam pressure: 1.27MPa
Initial steam temperature: 290�?/DIV> |
2 |
generator |
1 |
Rated power: 7.5MW
Outgoing voltage: 6300V(10500V) |
3 |
Kiln inlet waste heat boiler(SP boiler) |
2 |
Inlet gas amount: 150000Nm3/h
Inlet gas temperature: 340�?/DIV>
Outlet gas temperature: 250�?/DIV> |
4 |
Kiln outlet waste heat boiler(AQC boiler) |
2 |
Inlet gas amount: 65000Nm3/h
Inlet gas temperature: 350�?/DIV>
Outlet gas temperature: 100�?/DIV>
|
Main Economical Data and Index
No. |
Technical designation |
Unit |
Indexes |
Remarks |
1 |
Installed capacity |
MW |
7.5 |
|
2 |
Average generation power |
MW |
8.0 |
|
3 |
Annual power generation |
103kwh |
58000 |
|
4 |
Annual water consumption |
103t/a |
About300 |
|
5 |
Per ton clinker waste heat power generation amount |
Kwh/t |
36~38 |
|
6 |
Average generation power cost |
RMB/kwh |
0.10~0.15 |
|
7 |
Total investment |
Million RMB |
55-60 |
|
8 |
Investment recovery period |
Year |
2.5~3
|
|
Investment is only for theoritical calculation, quotation will be to individual project.