The piston is one of the main moving parts of the
engine, is composed of combustion chamber components. Engine Piston Parts,Engine Parts ,Car Engine Parts,Parts Of Engine,Piston Engine Parts ZhouShan HeCheng Machinery Co., LTD. , https://www.hcmarineparts.com
The pressure of the gas
piston through the connecting rod to the crankshaft, realize the change from
heat energy to mechanical energy.
The work condition is very bad, and the
temperature of 1400-1800 DEG C, and pressure
Up to 13MPa above the gas
contact, greatly alternating thermal stress and mechanical stress.
And by the
serious corrosion of gas, and under the condition of boundary lubrication and
cylinder wall friction and strong impact 1 times.
The piston in high
temperature, high pressure, strong corrosive gas contact so that it has enough
strength and hardness,
Heat resistance and good thermal resistance, high
fatigue strength and corrosion resistance. For high speed diesel Engine Piston
also requires light as far as possible.
In order to reduce the inertia
force.
Marine piston large low speed diesel engine of the crosshead is
usually combined.
The heat treatment process by normalizing and annealing,
and iron pearlite are ferrite organization, has good heat resistance.
Piston
alloy quenched and tempered steel has better heat resistance and corrosion
resistance. The skirt with nodular cast iron annealing treatment, with good wear
resistance.
What is the structure of the new horizontal electrostatic precipitator for industrial use?
Tengfei environmental protection industrial new horizontal electrostatic precipitator structure
1, corona electrode
The corona pole is also called the discharge electrode, and there are many types. Currently, a circular wire, a star wire, a zigzag wire, a thorn wire, and the like having a diameter of about 3 mm are often used.
The corona wire fixing method has a heavy hammer suspension, and the weight of the weight is 10 kg; the other is a tube frame stretching type.
The corona wire fixing method has a heavy hammer suspension, and the weight of the weight is 10 kg; the other is a tube frame stretching type.
2, dust collecting electrode
The tubular dust collector is a small tube with a diameter of 15 cm and a length of about 3 m; the large diameter is 40 cm and the length is 6 m. The number of dust collecting poles of each dust collector is as small as several, and more than 100.
The two sides of the plate dust collecting plate are usually provided with grooves and baffles, which can not only strengthen the rigidity of the plate, but also prevent the airflow from directly scouring the surface of the plate to generate secondary dust. The spacing between the plates has a great influence on the electric field performance and dust removal efficiency of the electrostatic precipitator. The spacing is too small (<200mm) voltage rise is not high, the spacing is too large and is limited by the allowable voltage of the power supply equipment. When using a 60-72kV transformer, the plate spacing is generally 200-350mm.
3, electrode cleaning device
4, high voltage power supply equipment
High-voltage power supplies provide the high field strength and corona current required for particle charging and trapping. Usually, the output voltage of a high-voltage power supply device is 70-100 kV, and the current is 100-2000 mA.
In order to enable the precipitator to operate under high pressure and avoid excessive spark loss, the high voltage power supply cannot be too large and must be supplied in groups. Large electrostatic precipitators often use six or more power supply units.
5, air distribution board
In order to reduce the vortex, ensure that the airflow is evenly distributed, the pipeline should be changed at the inlet, and the air distribution plate should be provided in the inlet and outlet duct. The common air distribution plates of zui are louver type, perforated plate distribution lattice, channel steel type and railing type distribution, etc., and the porous plate is widely used. Steel plates having a thickness of 3-3.5 mm are usually used. The aperture is 30-50mm, and the number of distribution layers is 2-3 layers.