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Home > News > Content
Steaming Machine Merit Oct 11, 2017

A steam engine is a reciprocating power machine that converts the energy of steam into mechanical work. The advent of the steam engine led to the industrial revolution of the 18th century. Until the early 20th century, it was still the most important original motive in the world, and then gradually gave way to internal combustion engines and steam turbines.

A steam engine requires a boiler that causes water to boil and produce high pressure steam. The boiler can use wood, coal, oil or natural gas or even combustible garbage as a heat source. Steam expands the pistons to do work.

Structure: steam engine mainly consists of cylinder, base, piston, crank connecting rod mechanism, slide valve and steam mechanism, speed regulating mechanism and flywheel. The cylinder and base are still parts.

In a steam boiler, the water boils to steam through the combustion process. Steam is sent through the pipe to the cylinder. The valve controls the time when the steam reaches the cylinder, through the main steam valve and the throttle valve into the sliding valve chamber, and the slide valve controls alternately to the left or right of the cylinder to drive the piston movement. The steam pushes the piston to work in the cylinder, and the cooled steam is recondensed into water through the pipe. This process is repeated during the steam engine.

A general steam engine consists of three cylinders. The steam engine converts the piston up and down to the rotation of the ship's axis. The new steam engine also contains a small turbine, and steam from the cylinder can also use its afterheat to drive the turbine to improve the efficiency of the entire drive. The turbine is also connected to the ship's propeller shaft.

merit

The greatest advantage of modern steam engine is that it can use almost all the fuel to convert heat energy into mechanical energy. Unlike the internal combustion engine, it is not fussy about its fuel. In addition, there is no steam engine and atomic energy cannot be used. Atomic reactor that is not directly produce mechanical energy, and does not directly generate electricity, atomic reactor is actually heating water, the water is boiling steam after converted into useful work by the steam engine. Steam does not necessarily need to be generated by burning, such as using a solar heater to generate steam to propel a steam engine.

Another small external gas turbine with similar advantages is the Stirling engine. The disadvantage is that it is difficult to run in many cases.

In particular, the advantages of the steam engine on the high mountain are remarkable, because they can also operate at low pressure. This was discovered when South America replaced their steam locomotives with diesel-electric locomotives. On the high mountains they had to abandon their high-power diesel locomotives, instead of the diesel locomotives, which are not as high as diesel locomotives.

In Switzerland and Austria new rack railway use modern steam engine, the engine only need a person to run, better than in the past it save 60% fuel steam engine, rather than power machine and diesel engine it 50% lighter, so much less wear on rack. There is also a new steamer on lake Geneva, the world's first remotely operated steam boat.

shortcoming

The weakness of the steam engine is that the whole apparatus is bulky and bulky; The pressure and temperature of the new steam cannot be too high, the exhaust pressure cannot be too low, and the thermal efficiency cannot be improved. It is a reciprocating machine, which limits the speed increase. The process of work is discontinuous, and the flow of steam is restricted, which limits the increase of power.

Therefore, the internal combustion engine, which abandoned the heavy boiler, was eventually replaced by the steam engine on ships and locomotives with the advantages of light weight, small volume, high thermal efficiency and flexible operation. The steam turbine has the advantages of high thermal efficiency, high power, high speed, light weight and smooth operation of the steam turbine, which has excluded the steam engine from the power station.

Then the electric motor is used for its convenience, replacing the application of steam engine in industrial equipment. However, the steam engine is more efficient than the steam turbine, so there is still room for the steam engine to work in the coal producing areas or in areas where there is only poor fuel.