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A Pressure Compounded Impulse Turbine is also called as Rateau Turbine after its inventor. Compounding steam turbines is done to extract energy more efficiently in a number of stages rather than a single stage. The compounding is done to reduce the increase in the entropy thus increasing the efficiency of the Steam Turbine.

In this turbine, the total Pressure is dropped in more than one stage and each stage consists of a set of nozzles and moving blades. In every stage pressure is dropped and velocity is gained. The velocity thus gained is utilized in converting to useful work.

As a result, the total pressure drop of the steam does not occur in the first nozzle but is distributed among all of the nozzle rings in the arrangement.

The Curtis Turbine is a Compound Impulse Turbine, the compounding limited for only Velocity. The Curtis turbine, invented in 1897, differs significantly from any other type of steam turbine in that it allows for the use of relatively low speeds without introducing any complicated mechanism. The Curtis wheel is widely used as the first stage of steam turbines in various multistage turbines today.

The Curtis Turbine is composed of one Stage of Nozzle as the Single Stage Turbine, followed by two rows of moving blades. These two rows are separated by one row of fixed blades attached to the Turbine Stator which has the function of redirecting the Steam leaving the first row of moving blades to the second row of moving blades. In the Curtis Stage, the total Pressure drop occurs in the nozzles. The pressure in two rows of the blades remains constant. The rotor rotates when steam passes through the nozzle and strikes the turbine blades that are fixed on the rotor. The rotor can be coupled to a drive unit such as a Pump, Blower, Fan, or to an electric generator to generate power.

Extraction back-pressure turbines are used when two or more types of process steam at different pressures are required. Process steam at required pressures is supplied through extraction openings and turbine exhaust while generating power in the process. Electric output is dependent on the demand for process steam.

Extraction backpressure steam turbines are used in medium & lower pressure requirements. This type of steam turbine is used in various industry segments like Vegetable Oil Industry, Dairy plant, Chemicals plants, etc. In this type of steam Turbine, we can achieve total cogeneration. We can also harness more power generation.

There are some important specifications of the extraction backpressure turbine. Type of steam turbine, Input & output steam parameters, No. of stages used, Power generation, steam flow & exhaust steam pressure & temperatures.
Turtle Turbines supplies Extraction Back Pressure Steam Turbines. Turtle Turbines is one of the few companies in the world offering Extraction Back Pressure Steam Turbines at capacities as small as 500 kW up to 5000 kW. These turbines have used the areas of vegetable oil, dairy plants & chemical plants. The sustainable solutions Turtle develops for client companies are environment friendly and enable efficient deployment of energy. For more information visit www.turtleturbines.com

Ethanol is an important industrial chemical. Ethanol is used as a solvent, in the synthesis of organic chemicals & also an additive to automotive gasoline (forming a mixture known as gasohol). ENA a Spirit very similar in composition to Ethanol is the intoxicating ingredient of many alcoholic beverages such as beer, wine & distilled spirits. ENA and Ethanol have completely different applications. ENA cannot be used for bleeding with automotive gasoline.

Ethanol is used to remove the carbon equivalent of 20 million cars from the road. Ethanol is used to reduce greenhouse gas emissions by 40-45% compared to gasoline-even when hypothetical land-use change emissions are included.

Different types of Alcohol such as RS, IS and ENA very similar to Ethanol is used as a solvent in the manufacture of varnishes and perfumes, also used as a preservative for biological specimens; in the preparation of essences and flavorings; in medicines and drugs. Ethanol is a renewable, domestically produced transportation fuel. Ethanol is used in low-level blends, such as E10 (10% ethanol, 90% gasoline). E15 (10.5% to 15% ethanol), or E85 (flex fuel)- a gasoline-ethanol blend containing 51% to 83% ethanol depending on geography and season ethanol helps to reduce emissions.

To produce quality ethanol, Steam at a constant and stable temperature is required. Turtle Turbines manufactures Steam Turbines specifically designed for Ethanol plants and is the best solution available in the market to get reliable power generation. Besides reliable power, Turtle Turbines provide steam at the exhaust at much more constant and steady pressures than can be achieved through PRV. Turtle Turbines manufactures a full line of steam turbines with capacities ranging from 300 kW to 3000 kW.

Turtle Turbines create products that are suitable for both safe and hazardous areas. Our products are appropriate for both continuous essential and non-critical applications. The modular construction concept allows for the greatest degree of customization to meet the most stringent project specifications.

The Micro Steam Turbine generator makes it possible to generate electricity at a reasonable cost and with minimal energy and resource loss. With the Micro Steam Turbine Generator, low steam flows and pressure differences are sufficient to generate power. The Micro Steam Turbine is not only substantially smaller than traditional steam turbines, but it is also completely Lube Oil Free and can be easily integrated into existing processes and factories.

Food, pharmaceutical, chemical, and textile industries, as well as energy suppliers, all have small and medium-sized businesses that use lower-output steam systems. Using the Micro Steam Turbine Generator, they may save a significant amount of energy. The small steam turbine produces more electricity with the same fuel input as conventional steam turbines in the output range of up to 300 kW. Because of the turbine’s low life-cycle costs, electricity prices can be lowered even in single-shift operation.

When installed in process facilities, the micro steam turbine generator substitutes a Pressure Reducing Valve (PRV) in the steam system. Steam for the Process is typically generated at high pressure in a steam boiler and then mechanically reduced to the desired operating pressure by a Pressure Reducing Valve (PRV). The Micro Steam turbine, which is situated between the steam boiler and the process, will continuously generate up to 300 kW of power.

The power generated from Micro Steam Turbines is green energy. The wasteful pressure energy of steam is converted into useful clean electrical power. A Micro Steam Turbine reduces carbon foot print of industries.

Steam Turbines need to be manufactured in a clean and controlled environment. Usually, Steam Turbines are subjected to Mechanical Run Test (MRT) in the factory after complete assembly. MRT is carried out by rotating the Steam Turbine to rated speed using an induction Motor. This Testing simulates the actual working condition of steam turbines only in a very limited way. The Turbine is rotated at the operating speed at room temperatures in an MRT and the blades running inside the casing experience only the ambient air. This type of MRT provides very limited understanding regarding how the same Steam Turbine will work at the site under actual conditions. 

Live Steam Testing (LST) of Steam Turbines is done using Steam instead of an Induction Motor. The Turbine is operated to full operating speed for about 4 hours. Various parameters such as Main Bearing Temperatures, Thrust Bearing Temperatures, Casing Temperatures, Lube Oil Inlet and Outlet Temperatures, Vibrations, etc are monitored under near real operating conditions of the steam turbine. Mechanical Overspeed settings are carried under near-real conditions. The Turbine is rotated at the operating speed at higher temperatures and the blades running inside the casing experience real steam instead of ambient air.

Live Steam Testing of Steam Turbines provides a better understanding of how the same Steam Turbine will work at site under actual conditions as compared to MRT. Live Steam Testing provides a deeper understanding. The onsite Commissioning time can be reduced to less than 50%. This saving of startup and commissioning time at site proves very valuable in Green Field Projects. Power becomes available for consumption at the site much faster thus reducing any dependency on local expensive power.

Turtle Turbines conducts Live Steam Testing of every Steam Turbine before it is dispatched to the site.  Lives Steam Turbine Test Rig has been developed by Turtle Turbines. A dedicated quick startup Diesel Fired Boiler is installed in the Factory. A Microprocessor is set up to capture and log all critical data during the Live Steam Testing.

Over the past decade, it has allowed Turtle Turbines to save several start-up and commissioning days at the site and resolve several possible corrections that become necessary at site.