Common cooling methods for turbogenerators include:
(1) Air cooling. It is divided into open air cooling and closed circulation air cooling. So-called open-air cooling consists of the fact that in ordinary small generators the generator fan draws cold air into the engine from the factory building, cools each part, and then exhausts it out of the machine . Closed cycle air cooling is used in large and medium sized generators. After the cooling air exits the generator, it is conducted under the machine pit. After being cooled by a set of air coolers, it is driven into the engine by one. fan. This air always circulates inside to keep the machine clean.
(2) Water cooling. Generally, it is a double internal water cooling, that is to say that the conductorss of the stator winding and the rotor excitation winding are hollow, the cooling water passes inside the conductors and the stator bore is always cooled by air. Although the cooling efficiency is high, the interior of the driver is prone to scaling and clogging.
(3) Hydrogen cooling. It is divided into two cooling methods: external hydrogen cooling and hydrogen water cooling. External hydrogen cooling is the same as air cooling, except the cooling medium changes from air to hydrogen, but the hydrogen cooler is inside the machine. The difference between water-hydrogen cooling and hydrogen cooling is that the cooling water passes inside the stator winding conductor, and the rest is the same as external hydrogen cooling.
Discuss carsStructural characteristics of the dual water internal cooling generator (taking the 125 MW unit as an example).
On October 27, 1958, the world's first 12,000 kilowatt, 3,000 rpm water-cooled double internally cooled turbine generator was born at the Shanghai Electric Machinery Factory.
In December of the same year, the Soviet Union organized a large-scale conference on turbogenerator cooling at the Leningrad “electricity” plant. In addition to the participation of major automobile manufacturers and research units of the Soviet Union, this meeting also included Wu Tianlin, deputy chief engineer of the Harbin Automobile Plant in Poland, Hungary and China, and Wang Geng of the Shanghai automobile factory. In accordance with the instructions of the leaders, Wu Tianlin announced at the conference that China has produced a 12,000 kilowatt and 3 kilowatt cooled double water turbine generator.000 rpm, which shocked the delegates present. Alexeiev, President of the Soviet Society of Electrical Engineering and Academician of Soviet Scientific Communications, congratulated the Chinese representatives and told the meeting that China was the first to test produce a twin-cooled turbine generator to water of 12,000 kW at 3,000 rpm using a 6,000 rpm motor. Rotary shaft kW. In Conference Proceedings and Proceedings. This is the first foreign report on China's first trial production of a water-cooled dual turbine generator.
Generator model of Shanghai Electric Machinery Factory 1969
Double water internal cooling generator adopts water, water and air cooling method , both the stator and rotor windings of the generator. It adopts internal water cooling, and the stator core and end structure adopt water coolingsaying by air. The cooling water for the stator windings has one water channel for each half-coil. The water inlet is at the excitation end of the stator and the water outlet is at the machine end. The stator connection pipe is also water-cooled, and the water inlet and outlet of each water channel are connected by polytetraethylene pipes. The rotor winding cooling water path has two rows per rotor slot. Each row of spools is a path of water that enters at the bottom of the thread bin and exits at the top of the bin. water channels are connected to insulated water pipes. The main inlet and outlet pipes are made of anti-corrosion and anti-magnetic stainless steel pipes. The cooling water enters the rotor from the field end and flows along the hollow axis in the center of the rotor., as the cooling water passes through the col reservoirend water drive and the water inlet pipe, it flows to the rotor winding and flows out of the rotor water outlet pipe and the water outlet device. Cooling air is supplied by a fan installed on the rotating shaft of the generator and forms a closed circulation system with the air cooler. Cold air is driven from the end cover air inlets at both ends by installed axial fans. at both ends of the rotating shaft and passes through the surface of the rotor and the stator. The iron core adopts two inlet and two outlet radial ventilation method.
What are the three cooling methods of diesel generator sets. ?
Model TQ-3-2. In 1969, Shanghai Electric Machinery Factory first designed and manufactured a 125,000 kilowatt internally cooled dual-water steam turbine generator. The machine adopted the latestinternational model with internal double water steam turbine. -cooling method at that time and high temperature applied. The intermediate and high pressure reheating and other technologies are directly coupled and driven by the steam turbine, which has large overload capacity and fully meets the requirements of international IEC standards. It has the characteristics of high short circuit ratio, good stability for power grid, small size, light weight, low material consumption, simple system and convenient operation and maintenance. Currently, this product has been developed into a train of 50,000 to 300,000 kilowatts, with an apparent power of 62,500 to 353,000 kilowatts, an active power of 50,000 to 300,000 kilowatts, a voltage of 10,500 to 18,000 volts. , a current of 3,440 to 11,320 amps. and a rotation speed of 3,000 rpm, thepower is 0.8 to 0.85, frequency is 50 Hz, efficiency is 98.1 to 98.45%, stator weight is 52 to 157 tons, and rotor weight is 18 to 57 tons. . It can be used for industrial and agricultural production as well as for lighting in large and medium-sized cities.
There are two cooling methods for diesel generator sets: air cooling and water cooling.
1. Wind Cooling Method:
The wind cooling method uses air as a cooling medium to transfer heat from the heated parts of the diesel engine. This cooling method consists of cooling. fan and guide cover, etc.
In order to increase heat dissipation neps, many corrugated fins are usually cast on the outer walls of the cylinder block, cylinder head and each radiator. During operation, the fanr rotates to circulate air along the air guide cover to the surface of the cylinder block and cylinder head. As cold air passes through the heat sink, it carries away heat from the cylinder block and cylinder head.
The air-cooled cooling system has a simple structure and small weight, but the cooling effect is poor. It is mainly used in small diesel engines and is suitable for areas lacking water.
2. Water Cooling Method:
The water cooling method uses water as a cooling medium to transfer heat from the heated parts of the diesel engine. The characteristic of this cooling method is that it is easy to adjust the cooling intensity when the temperature or workload changes.
There are two types of water cooling methods: open type and closed type. In a cooling systemopen, the circulating water is directly connected to the atmosphere and the steam pressure in the cooling system is always maintained at atmospheric pressure. In a closed system, water circulates in the closed system and the vapor pressure of the cooling system is greater than atmospheric pressure. As the temperature difference between the cooling water temperature and the outside air temperature increases, the heat dissipation capacity of the assembly increases. the cooling system is improved.