High-temperature and high-pressure positive action desuperheater

Abstract

The invention relates to a high-temperature and high-pressure positive action desuperheater, comprising a valve body. A attemperation water inlet arranged on the valve body is communicated with a valve cavity arranged in the valve body, a valve rod is arranged in the valve cavity, a valve core is fixed at the lower end of the valve rod, a nozzle sleeve is fixed at the lower end of the valve body,a nozzle is arranged on the side wall of the nozzle sleeve, a valve seat is arranged between the valve body and the nozzle sleeve, the valve core is matched with the valve seat, and at least one groove the depth of which is gradually decreased along the axial direction is arranged on the side wall of the valve core. In the invention, a metal piston sealing ring is cancelled so that the abrasion of the inner wall of the nozzle sleeve can not be caused, and the service life of the desuperheater is greatly prolonged with favorable sealing performance; in addition, the groove with the depth gradually decreased is designed on the valve core and is synchronously regulated with the nozzle of the nozzle sleeve, thereby playing a role of linear or equal percent accurate flow regulation.

Description

technical field [0001] The invention relates to a high-temperature and high-pressure positive-action desuperheater, which is mainly used for precise temperature reduction control of superheated steam in boilers and steam turbine systems of power plants, petrochemicals, metallurgy, papermaking, etc. Background technique [0002] There are two main types of desuperheaters used for superheated steam desuperheating control: [0003] The first is a split desuperheater, which is composed of a desuperheating water regulating valve and a fixed nozzle. The flow of desuperheating water is controlled by the desuperheating water regulating valve during operation, and the nozzle sprays the desuperheating water into the steam pipeline to achieve the purpose of lowering the steam temperature to the set value. In the desuperheater of this structure, no matter the amount of desuperheating water, the nozzle is always open, so the atomization effect will be poor, especially when the flow rate...

AI Technical Summary

Problems solved by technology

However, there is a common problem that is difficult to solve in this type of desuperheater, that is, the sealing of the metal piston ring used on the plunger valve core used to adjust the opening quantity of the nozzle.

The metal piston ring is easy to wear during work, which will cause the gap between the piston ring and the inner hole of the nozzle sleeve to increase until the inner hole of the sleeve is damaged

This will affect the flow into each nozzle, thereby affecting the regulated flow of desuperheating water

With the increase of wear and tear, it will fail, and finally the flow of desuperheating water cannot be controlled

This type of desuperheater generally wears out after half a year to two years, affecting normal use

And because the nozzle sleeve and spool wear out at the same time, the cost of replacing spare parts is very high

caused great trouble to users

In addition, due to the increased gap after the wear of the piston ring and the nozzle sleeve, the desuperheater cannot be guided when it is working, and oscillation will occur

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