A double-layer flash tank

Abstract

The invention provides a double-layer flash tank. A tank body is arranged in an embedded type structure of an inner layer tank body and an outer layer tank body, a mixture of external steam condensate water and steam is directly led to the inner layer tank body, the condensate water upwells under the action of pressure, the steam and the water of the mixture are separated through dilatation, part of the condensate water is flashed to be steam, a cone-shaped hopper device is arranged on the top portion of the tank body so as to improve the effect of separation of the steam and the water, the steam and part of non-condensable gas are discharged through a pipeline on the top portion of the tank body; returned condensate water bounces back and forth between baffles on the inner wall so that further vaporization and separation of the steam and the water are achieved, the high and low liquid level portions in the tank body are led to a liquid level transmitter, signals output by the liquid level transmitter are adjusted by a liquid level controller, opening degree of a liquid adjusting valve is controlled by the output signals so that the purpose that the flash tank is controlled automatically is achieved. Compared with an existing flash tank, the double-layer flash tank is high in steam generation efficiency.

Description

technical field [0001] The invention relates to a high-efficiency flash tank, in particular to a double-layer flash tank. Background technique [0002] At present, in the field of industrial fluid system applications, high-temperature and high-pressure steam is widely used, and the recovery and reuse of steam condensate after use has become an important link in energy saving and emission reduction of the entire production line. As a key component in the steam condensate circulation system, the flash tank can separate the steam condensate from steam and water, and the secondary steam from the flash can be used again in the medium and low pressure steam system, while the condensate is discharged into the boiler room or It is recycled in the pulping workshop. [0003] Existing flash tanks all adopt a cylindrical single-layer tank structure. The tank body is used as a flash expansion space. A concave hemispherical porous stainless steel plate is welded in the tank to increase t...

AI Technical Summary

Problems solved by technology

[0003] Existing flash tanks all adopt a cylindrical single-layer tank structure. The tank body is used as a flash expansion space. A concave hemispherical porous stainless steel plate is welded in the tank to increase the separation effect of steam and water. There are no other devices. Poor steam-water separation effect

Moreover, the existing flash tanks all use the high and low voltage signals in the tank to be led to DCS (Distributed Control System, Distributed Control System) to realize the liquid level control in the tank, which will increase the number of DCS control points and the usage of communication cables, thereby increasing The cost of the entire control system is reduced, and the distance between the liquid level sensor and the controller is relatively inconvenient to operate and observe.

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