Power plant based on Siemens SST-300 on natural gas and biomass, Kyiv

Hybrid thermal power plant based on Siemens SST-300 on natural gas and biomass.

Basic equipment - Siemens SST-300, generator 11 kV/50 Hz, condenser, pumps, deaerator, control systems, 4 Clayton
Additional module - Steam boiler on local biomass: cotton stalks, rice husks, straw, husks, wood waste, etc.
Potential model - Hybrid TPP/CHP with the possibility of electricity production and heat extraction
The existing Siemens SST-300 steam turbine package and 4 Clayton gas-fired steam generators are supplemented by a local biomass boiler. As a result, a flexible TPP/CHP is formed: naturalgas + biomass → steam → electricity + possible heat.

The project combines the reliable European Siemens steam turbine technology, the flexibility of Clayton gas steam generators and the economic potential of local renewable fuel.

• Siemens SST-300 steam turbine;

• electric generator 11 kV, 50 Hz;

• condenser and pumping equipment;

• deaerator, control systems and auxiliary equipment;

• 4 Clayton gas steam generators;

• an additional biomass boiler as a steam power expansion module.

Possible types of biomass:

Cotton stalks

Rice husk

Straw / corn stalks

Sunflower husk

Small chips / waste

The proposed technical scheme:

1. 4 Clayton gas steam generators run on natural gas and provide fast, stable and controlled steam flow.

2. An additional biomass boiler runs on local biofuel and provides additional steam volume to increase the overall power of the plant and reduce natural gas consumptiongas.

3. Pair from Clayton and fromof a biomass boiler is collected in a common steam collector.(//tractor-service.com)

4. The general steam flow is fed to a Siemens SST-300 steam turbine.

5. The turbine rotates the electric generator and produces electricity at a voltage of 11 kV.

6. Through a step-up transformer, electricity can be transmitted to the network or used for industrial consumers.

7. If necessary, part of the steam can be taken from the turbine for heat supply, heating in the winter or technological needs.

A feature of the Siemens SST-300 turbine

An important advantage of this turbine is that it can be considered not only as a turbine for the production of electricity, but also as a basis for a combined heat and power plant.

The design of the turbine provides for the possibility of working with steam extraction. This opens up an additional direction of application: if there is a consumer, the warm part of the steam can be used for heating, process steam, greenhouse complexes, drying complexes, industrial enterprises or communal heat supply.

Operating modes:

Electric mode

Heating mode

Combined industrial mode

• Mode 1 - work only on existing 4 Claytons. The station can produce electricity in reduced mode; the expected power needs a separate calculation.

• Mode 2-4 Clayton + additional biomass boiler. This is the main option for increasing steam power and reducing natural gas consumption.

• Mode 3 – combined TPP/CHP. The station produces electricity and, if necessary, gives part of the steam or heat to consumers.

• Mode 4 — backup mode. Gas Claytons are used as a quick source of steam for start-up, load control, biomass boiler support or backup.

Possible biomass boiler
The additional boiler can be made as a steam water-tube boiler on biomass adapted to a specific local type of fuel.
• 15 t/h steam;
• 20 t/h steam;
• 25 t/h steam;
• 30 t/h steam;
• other capacity according to the results of the technical task.

The exact parameters of the boiler should be selected after analyzing the type of biomass, humidity, ash content, calorific value, content of chlorine and alkaline elements, seasonality of fuel supply, logistics, required electric power, the need for heat extraction, environmental requirements, availability of water resources and cooling system.