Piston vacuum pump in coal tar distillation

The piston vacuum pump is composed of top cover, valve plate, cylinder, casing, piston skin ring, connecting rod assembly, cooling fan, fan cover, silencing equipment, shockproof feet and other structures.

As the temperature at the outlet of the heating furnace is significantly lower than that of atmospheric distillation after the decompression distillation of coal tar is adopted, the system operation temperature is reduced, the hydrogenation, decomposition and polymerization of tar components are prevented, the tar components are stable, and the gas is saved at the same time; the yield of naphthalene is obviously improved by cutting out the three mixed components; the quality of asphalt is stable, and the change range of softening point is small; no direct steam is needed at the bottom of the tower, and the steam is used At the same time, the production of some waste water is reduced.

The vacuum system provides the negative pressure required by the coal tar distillation process. The key part of vacuum system is piston vacuum pump. The mechanical pump is vacuumized by the principle of mechanical pumping, which is composed of stator, rotor, rotor, etc. the mechanical pump generally has a low degree of vacuumization. As the temperature at the outlet of the heating furnace is significantly lower than that of atmospheric distillation after the decompression distillation of coal tar is adopted, the system operation temperature is reduced, the hydrogenation, decomposition and polymerization of tar components are prevented, the tar components are stable, and the gas is saved at the same time; the yield of naphthalene is obviously improved by cutting out the three mixed components; the quality of asphalt is stable, and the change range of softening point is small; no direct steam is needed at the bottom of the tower, and the steam is used At the same time, the production of some waste water is reduced. Therefore, piston vacuum pump is widely used in the field of coal tar processing.

piston-vacuum-pump-in-coal-tar-distillation

Compared with other types of vacuum pump, piston vacuum pump has the following characteristics: compact structure, high number of revolutions of vacuum pump, direct connection with motor in general, no need of deceleration device.

The structure size is small, the floor area is also small, can obtain the large exhaust volume.

Compressed gas is basically isothermal, so it can pump out flammable and explosive gas. Because there is no exhaust valve and friction surface, the mixture of dusty gas, condensable gas and steam water can be removed. The suction is uniform, stable and reliable, the operation is simple, and the maintenance is convenient.

The vacuum system and its control parameters are shown in. The tar vacuum system is composed of seal oil circulating tank, seal oil circulating pump, seal oil cooler, vacuum pump and tower top pressure : the application of vacuum pump in coal tar distillation. The seal oil circulating pump delivers the washing oil from seal oil tank to the vacuum pump. The seal oil circulating volume is controlled at 3m3 / h. The vacuum pump continuously extracts the gas phase substances from the tower top, and the tower top The pressure required by each tower process is set by DCS system, and automatic control is realized by pressure control regulating valve. Most of the gas-phase substances are dissolved in the wash oil, which is delivered to the seal oil circulation tank by the vacuum pump. The liquid level of the tank will gradually rise, and the temperature will rise accordingly. The temperature of the circulating volume of seal oil is controlled by the seal oil-water cooler at about 25 ° C. After the liquid level rises, the sealing oil can be poured into the raw material tar tank through the level control regulating valve of the sealing oil tank for re distillation, and the liquid level is kept at about 50 °.

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