Adjusting The Extraction Turbine

1. Dynamic characteristics

A single regulated extraction steam turbine, also known as a single extraction heat supply steam turbine, consists of a high pressure section and a low pressure section, which is equivalent to a combination of a back pressure steam turbine and a condensing steam turbine. The new steam enters the high pressure section to do work, expands to a certain pressure and is divided into two strands, one strand is drawn out to supply the heat user, the other strand enters the low pressure part to continue to expand and do work, and finally discharged into the condenser.

The power of a single extraction steam turbine is the sum of the power generated in the high and low pressure sections, which is determined by the amount of steam admitted to the turbine and the steam flow through the low pressure section. Adjust the intake of steam can get different power, therefore, in a certain range can meet the needs of thermal and electrical load.

2. Steam consumption characteristics

The single extraction steam turbine is equivalent to a condensing steam turbine when the heat supply extraction is zero. In theory, if all the steam entering the high-pressure cylinder is extracted to supply the heat user, it is equivalent to a back-pressure turbine. However, in actual operation, in order to cool the low pressure cylinder and take away the heat generated by the blast friction loss, a certain amount of steam must flow through the low pressure section and enter the condenser, and the minimum flow required is about 5% to 10% of the design flow of the low pressure cylinder