What is double flash steam power plant?

What is double flash steam power plant?

Double flash geothermal power plants produce a higher power output than single flash geothermal power plants but at a higher cost. The cost of the dual flash is higher than the single flash due to the use of more piping, a second separator, and low- and high-pressure steam turbines.

How much is steam per MW?

And generally around 3 t/h steam is used to generate 1MW from a steam turbine. The actual value would vary depending on the cycle parameters such as temperature, pressures, extractions, and condenser parameters.

What is the temperature of direct dry steam?

In a geothermal dry steam power plants with vapor condensation, vapor at the exit of the turbine is not discharged directly into the atmosphere, but passed in a condenser where constant temperature is maintained, usually 35 to 45oC.

What is a single flash power plant?

The single-flash steam plant is the pillar of the geothermal power plants and usually used in the geothermal power production industry. The geothermal fluid passes through an expansion valve at state 1 to minimize the fluid pressure instantly in an isenthalpic process.

How do you flash a steam power plant?

Flash steam plants take high-pressure hot water from deep inside the earth and convert it to steam to drive generator turbines. When the steam cools, it condenses to water and is injected back into the ground to be used again. Most geothermal power plants are flash steam plants.

How do steam power plants work?

A steam power plant consists of a boiler, steam turbine and generator, and other auxiliaries. The boiler generates steam at high pressure and high temperature. The steam turbine converts the heat energy of steam into mechanical energy. The generator then converts the mechanical energy into electric power.

How does a dry steam power plant work?

Dry Steam Power Plant Dry steam plants use hydrothermal fluids that are primarily steam. The steam travels directly to a turbine, which drives a generator that produces electricity. The steam eliminates the need to burn fossil fuels to run the turbine (also eliminating the need to transport and store fuels).

What is the efficiency of geothermal power plants?

The thermal efficiency of geothermal electric stations is low, around 7–10%, because geothermal fluids are at a low temperature compared with steam from boilers. By the laws of thermodynamics this low temperature limits the efficiency of heat engines in extracting useful energy during the generation of electricity.

What is the best type of geothermal power plant?

Binary cycle plants Binary power plants are expected to be the most commonly used type of geothermal power plant in the future, as locations outside of the known hot spots begin to use geothermal energy. This is because binary cycle plants can make use of lower temperature water than the other two types of plants.

What is the minimum air pressure required to eject air from ejector?

Heat Exchange Institute recommends evacuation of air from atmospheric pressure to 33.86 kPa absolute pressure Hg in about 1800 s. The ejector performance is affected by either high/low supply steam pressure to the ejector or by high condensate level in the ejector.

How effective is the ejector in reducing wellhead pressure?

The ejector was effective in reducing the wellhead pressures of Well 1 and Well 3 as planned but, unfortunately, the 20 bars reduction was insufficient to restart either of the two wells. The ejector was a technical success but the candidate wells did not respond as expected.

What are the parameters involved in ejector sizing and staging?

Important parameters involved in ejector sizing and staging include pressure of motive gas, required discharge pressure, suction pressure and relative mass flow rates of motive fluid to suction fluid. For instance, most ejectors use steam as the motive fluid.

What are the factors that affect the performance of ejectors?

The ejector performance is affected by either high/low supply steam pressure to the ejector or by high condensate level in the ejector. In such cases, put the starting air ejector in service immediately along with the running main air ejector to prevent a decrease in vacuum.