Combined jet ejection type steam-water hybrid heating device

Abstract

The invention discloses a combined jet ejection type steam-water hybrid heating device suitable for a low-pressure working condition. The device comprises a zooming arc-shaped mixing chamber, a diffusion chamber, a steam-water mixing reinforcement chamber, a plurality of condensed water ejection type inlets and at least two steam inlets, wherein one end face of the zooming arc-shaped mixing chamber is connected with one end face of the steam-water mixing reinforcement chamber in a coaxial way, and the other end face of the steam-water mixing reinforcement chamber is connected with the diffusion chamber in a coaxial way; the plurality of condensed water ejection type inlets are connected with the other end face of the zooming arc-shaped mixing chamber; the pipe wall of the throat part of the zooming arc-shaped mixing chamber is connected with the at least two steam inlets. The ratio of the end face diameter to the tube length of the zooming arc-shaped mixing chamber is equal to 0.2-0.5;the ratio of the total cross-sectional area of the plurality of condensed water ejection type inlets to the cross-sectional area of a throat pipe of the steam-water mixing reinforcement chamber is equal to 0.008-0.02; the ratio of the total cross-sectional area of the plurality of condensed water ejection type inlets to the total cross-sectional area of the steam inlets is equal to 0.03-0.07; theratio of the cross-sectional area of the throat part of the steam-water mixing reinforcement chamber to the cross-sectional area of an outlet of the diffusion chamber is equal to 2-5; the ratio of the diameter of the throat part to the diameter of the end face of the zooming arc-shaped mixing chamber is equal to 0.50-0.99.

Description

technical field [0001] The invention relates to a structural design of a combined jet injection type steam-water mixing heating device suitable for low-pressure working conditions, which is used in the fields of steam-water surface heat exchange technology, especially the surface heat exchange technology and device in a vacuum state. Background technique [0002] Heat exchanger is a device that can realize heat exchange. It is widely used in chemical industry, medicine, thermal power generation and other industries, and plays an important role in thermal power units. [0003] The low-pressure heater in the thermal power unit is a heat exchanger. The low-pressure heater exchanges heat between the condensed water of the unit and the steam that has done work in the steam turbine, and increases the temperature of the feed water to improve the cycle efficiency of the thermal system. At present, the low-pressure heating systems of thermal power plants at home and abroad mainly use...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of low thermal efficiency and large heat exchange end difference existing in the existing single-pipe ejection type steam-water mixing heater, the present invention provides a combined jet ejection type steam-water mixing heating device, which can operate at low pressure and vacuum Enhance ejection under certain conditions, enhance heat transfer, reduce end difference, and improve thermal efficiency

Images