Large caliber acoustic velocity-variable supercharging heat-exchanging system

Abstract

The invention discloses a large-caliber variable sonic speed pressurizing heat exchange device. The device consists of a front reducing pipe (1), a steam jet pipe (2), a tee pipe (3), a short two-way pipe (4), a long two-way pipe (6), a back reducing pipe (7), a front mixing chamber (9) and a back mixing chamber (5), wherein the steam jet pipe is inserted into the tee pipe coaxially; the tee pipe is connected between the front reducing pipe and the short two-way pipe; the long two-way pipe is connected between the short two-way pipe and the back reducing pipe to adjust water inlet flow and steam-water mixing proportion inside the mixing chambers; and the back mixing chamber is arranged inside the short two-way pipe and improves the stream and field state of steam-water mixture through changing circulation section area. Through improving the structures of the mixing chambers, the large-caliber variable sonic speed pressurizing heat exchange device can effectively improve the stream and field state of the steam-water mixture so as to ensure that steam-water mixing mass ratio and pressure ratio inside a heat exchanger are always in the best state. Moreover, the large-caliber variable sonic speed pressurizing heat exchange device effectively reduces equipment operation noise and operation cost and improves heat exchange efficiency and operation safety. When a steam-water parameter of a system is changed, dynamic adjustment can be realized through adjusting the positions of nozzles and the mixing chambers.

Description

technical field [0001] The invention belongs to the technical field of heat exchange, and mainly relates to a large-diameter variable-sonic speed booster heat exchange device. Background technique [0002] The existing variable-sonic supercharged heat exchange device can only perform small-flow steam-water heat exchange, the water intake is less than 100 tons per hour, and the heating area of ​​a single unit is less than 50,000 square meters. When the water intake further increases, the inside of the heat exchanger The steam-water mixture stream will change from a laminar flow state to a turbulent flow state. Because the structure of the mixing chamber is a single large-diameter flow channel, the diameter of the flow cross-sectional area increases under the single large-diameter flow channel, and the flow state of the steam-water mixture is Turbulent flow, due to the effect of additional shear stress, the fluid particles are constantly mixed and collided with each other, cau...

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Problems solved by technology

[0002]The existing variable-sonic speed booster heat exchange device can only perform small-flow steam-water heat exchange, its water intake is less than 100 tons / hour, and the heating area of ​​a single unit is less than 50,000 square meter, when the water intake further increases, the steam-water mixture flow inside the heat exchanger will change from a laminar flow state to a turbulent state. , the diameter of the flow cross-sectional area increases, and the flow state of the steam-water mixture is turbulent flow. Due to the additional shear stress, the fluid particles are constantly mixed and collided with each other, so that the fluid velocity, temperature, and pressure are generated in the radial and axial directions. Changes increase the energy loss of the fluid, making the speed and pressure of the steam-water mixture in the mixing chamber fluctuate, resulting in unstable operation of the heat exchanger

When the field state of heat exchange changes sharply, the heat exchange process cannot be carried out in a stable state

When the heat load of the heat exchanger or the heating area is large, the variable-sonic supercharged heat exchange device cannot meet the requirements of use, and the water intake is forced to increase. When the heat exchanger is running, there will be loud abnormal noise and vibration, which may easily cause pipeline and Safety accidents in heat exchange equipment

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