A steam desuperheating system

Abstract

The invention discloses a steam temperature-reducing system. The steam temperature-reducing system comprises a steam outer tube, a venturi tube and a nozzle, wherein the venturi tube is connected to the inner wall of the steam outer tube in an inserted manner and comprises a front end and a throat portion; the front end of the venturi tube faces the left side of the steam outer tube; the inner diameter (D) of the left side of the front end of the venturi tube is smaller than the inner diameter (D1) of the right side of the front end of the venturi tube; the inner diameter of the steam outer tube is equal to the inner diameter of the left side of the front end of the venturi tube; the right side of the front end of the venturi tube is connected with the throat portion of the venturi tube; the inner diameter (D2) of the throat portion of the venturi tube is smaller than the inner diameter (D1) of the right side of the front end of the venturi tube; the nozzle penetrates in the steam outer tube and the front end of the venturi tube and is hermetically connected with the steam outer tube and the front end of the venturi tube; and a plurality of small holes are formed in a portion, which is positioned in the front end of the venturi tube, of the nozzle. Because steam entering the steam temperature-reducing system is accelerated twice, the steam and temperature-reducing water are mixed uniformly, the efficiency of heat transfer between the steam and the temperature-reducing water is high, and the length of the steam temperature-reducing system is reduced.

Description

technical field [0001] The invention relates to the technical field of thermal energy conversion, in particular to a steam desuperheating system. Background technique [0002] The desuperheating system is a steam heat energy conversion device. It is a heat exchange device that converts steam at a higher temperature into steam at a desired temperature by spraying water to reduce the temperature. The cooling system is widely used in light industry, machinery, chemical industry, metallurgy and other industrial fields. The performance of the desuperheating system directly affects the quality of products in the above-mentioned industrial fields, and the desuperheating system with poor performance even makes these processes impossible. [0003] The desuperheating of the steam is realized by atomizing, heating and vaporizing the desuperheating water in the desuperheater. The first stage is that the desuperheating water is initially atomized through the nozzle. In this stage, the...

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Problems solved by technology

In the case of a large flow range (such as 10% to 100% Q), to ensure the quality of the steam in the desuperheating system (steam without water), the method of increasing the length of the desuperheating device is used in the prior art, but due to Impossible to increase its length infinitely, cannot be widely used

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