Technical proposal for 15Mw Biomass based Cogeneration Power Plant, Sri Lanka

Requirements from the clients:

We, the Sugar Industries Ltd (SSIL) is one of the leading sugar cane growers cum manufactures in Sri Lanka. It is a Limited Liability Company and is a subsidiary group Companies which is a leading industrial conglomerate engaged in Manufacturing and Export of Garments, Construction, Aviation, Shipping, Eco-tourism, & Hotels, Bio- fertilizer Manufacturing & Trading

Even though the installed capacity of the mill was 1250 TCD, presently it is running around 1650 TCD which is a bottleneck to the present scenario .The existing two steam generators can produce about 2.5Mw of electricity from 2x25 TPH boilers.

To over the problem we have planned to expand the sugar mill to 3000 TCD with 15Mw Cogeneration plant by using most efficient and environment friendly technologies which include high pressure boilers and double extraction cum condensing type TG set

Hence you are invited to quote for the above plant on a turnkey basis. For further clarification do not hesitate to contact the undersign

Looking forward to hear from you.

We need both the boiler and the turbine generator. Moreover we need a multi-fuel boiler which can feed bagasse and other biomass like rice husk, paddy husk, fuel wood

The boiler specification is attached herewith

1.        TECHNICAL SPECIFICATIONS OF BOILER SUITABLE FOR 15 MW CO-GEN. &

2.        3000 T.C.D.

1.                  Net steam output of the boiler

main steam stop valve                    :-     80.00 Mt/Hr.

(considering 22 hrs operation)

2.                  Superheated steam pressure at

main steam stop valve  outlet          :-     110.0 (Ata) 

3.                  Superheated steam  outlet

temperature at stop valve outlet             :-     515  ± 5 deg.C.

4.         Steam Generation                          :-            Shall be designed to generate 100% MCR 

                                                                              capacity with 50% moisture Bagasse

5.         Fuel                                :-     Bagasse (50% Moisture)

6.         Fuel Firing System                  :-     Spreader stoker  with traveling grate.

7.         Multi fuel Optimum                 :-     Capable of firing other bio mass fuel’s

                                                  like wood chip, rice husk, coconut  shell,

saw dust, deoily bran, either separately or         in combination with bagasse.

8.                  Peak generation capacity  as to

percentage of MCR, under any of                                                          

the fuel combination given above           :-     110 %

9.                  The pressure drop on main steam   line 

between boiler super heater outlet

and common steam distribution header   :-     1.5 Kg/Cm²

10.              The flue gas temperature at the stock

inlet shall not be more than             :-     150 Deg c     

11.              Boiler feed water temperature at the

inlet to the economizer                   :-          170 Deg.c

12.              Allowable maximum dust content in       :-     115 mg/n.cu.m.

flue gases leaving dust collection system

(ESP)

We need boiler, ST, Generator with the attached list of equipment. Briefly we need a comprehensive total package.

I hope you are clear with our stand.

Resource Comprehensive Utilization Power Station Technical proposal.

1.      The Working Scope

2.      Waste heat resource

The project is to utilize the pulp mixed rice hull, coco hull and some other biological fuel cell as the fuel to produce electricity. The fuel will be dried first and the storage area of the fuel shall take 48×150m, which considering the 15 days capacity. The fuel will be fed to the boiler by the feeding belt from the storage bin.

3.      Fuel

The chain boiler, which can burn different kind of fuel, will be adopted. The water will be pumped to the Low-Pressure heater first and then to deaerator and High-Pressure heater and then to boiler. The boiler will produce the steam with 80t/h-9.8MPa-540Celsius Degree will be introduced into the steam turbine with the capacity of 15MW. The turbine has Low-pressure and High-pressure steam extraction outlet for heating the feedwater in Low-Pressure heater, High-Pressure heater and deaerator.  Therefore, the thermodynamic system formed.

4.      Treatment of waste gas and slag

The electrical precipitator with single line and four electric fields will be storage in the slag bin. The storage bin will be installed for storing the slag discharged from the boiler; the slag will be transported to the outside. The waste gas will be induced to the stack by fan.

5.      Cooling water and Demineralized water System

Water circulating cooling system will be selected which includes the pumps, cooling towers, water pond and pipeline. During the system working, the cooling water will be pumped from the water pond to the equipments which needed to be cooled; after heat exchanging, the water will be transported back to the cooling tower.

The mixed-bed exchanger system will be selected as the water demineralization system. The process of water treatment is as follow:

Water (domestic water pipeline or firefighting pipeline) -mechanical filter-clean water tank-clean water pump-action exchanger-CO2 removal equipment-intermediate tank-intermediate pump-anion exchanger-demineralized water tank-Demineralized water pump-Turbine room

6.      Main Equipment

7.      Main Indexes