The technical Proposal Of Pure Low Temperature Waste Heat Power Plant of 18MW
For 2x5000t/d Cement Production Line
Take consider of the process flow, layout, power supply and distribution, and water supply of the clinker production line, by utilizing the heat resource exhausted from the pre heater and cooler, one 18000kw pure low temperature waste heat power station is appropriate for the 2*5000t/d clinker production line. We are China power contractor to provide you total solution for the turnkey projects of waste heat recovery power plant.
Waste heat resource
The waste heat source of the cement line can be utilized as follows: 2*5000t/d cement production line kiln outlet cooler waste heat condition after reformation will be 2*240000Nm3/h-360�? 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*340000Nm3/h-350�?
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, 1200~1500kw start-up power supply is necessary which will be supplied by the general substation. After the generator putting into production, the generator will be connected to outside power network by genral 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 by general substation or generator.
In order to make sure the power station run in reason and smoothly, a high & low voltage distribute 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 power to it. Connection synchronous points will be set at generator liaison switch and generator outlet switch.
Water supply
Since the average production and domestic water consumption will be about 3400m3/d, the water supply should be 4000m3/d.
4. Technical safeguard condition
4.1 Thermodynamic system
According to the process flow and design parameter of 2*5000t/d cement production line, adopting China institutes and manufacturers pure low temperature waste heat recovery and Chinese-made equipments, the power generation amount pert ton can achieve 36~38kwh.
4.2 Brief introduction of technical solution
4.2.1 Kiln outlet waste heat boiler-AQC boiler
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); 1.6Pa 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.
4.2.2 Kiln inlet waste heat boiler-SP boiler
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 for power generation.
4.2.3 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 18000kw, and initial steam parameter is 1.27Mpa-290�?
4.2.4 One generator is selected to match the condensing turbine
One normal 6(10)kv AC generator with 9000kw rated power is adopted, which will be connected to outside power network by general substation 6(10)kv.
4.2.5 Circulation cooling water system will be adopted for meeting the cooling water demand of the power station.
4.2.6 A“Filter+ demineralizing”system will be adopted as chemical water treatment for meeting the boiler water criterion
4.2.7 DCS computer control system is adopted for monitoring the power station sunning.
4.3 Main equipments
No |
Equipment name and model |
Quantity |
Main technical spec. |
1 |
Condensing steam turbine |
1 |
Rated power: 18MW
Initial steam pressure: 1.27Mpa
Initial steam temperature: 290�?/DIV> |
2 |
Generator |
1 |
Rated power: 18MW
Outgoing voltage: 6300V(10500V) |
3 |
Kiln inlet waste heat boiler(SP boiler) |
2 |
Inlet gas amount: 340000Nm3/h
Inlet gas temperature: 350�?/DIV>
Outlet gas temperature: 250�?/DIV> |
4 |
Kiln outlet waste heat boiler(AQC boiler) |
2 |
Inlet gas amount: 240000Nm3/h
Inlet gas temperature: 360�?/DIV>
Outlet gas temperature: 100�?/DIV> |
Main technical economy index
No. |
Technical designation |
Unit |
Indexes |
Remarks |
1 |
Installed capacity |
MW |
18 |
|
2 |
Average generation power |
MW |
17.5 |
|
3 |
Annual power generation |
103kwh |
126000 |
|
4 |
Annual water consumption |
103t/a |
About 300 |
|
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 |
120 |
|
8 |
Investment recovery period |
Year |
2.5~3 |
|
|