Multistage pressure control complex muffler

Abstract

The invention discloses a multistage pressure control complex muffler. A restriction orifice plate is arranged at the lower end of an inner cavity of a main manifold in a casing; a plurality of roundholes are spread on the wall part of the main manifold from top to bottom to form a second-stage pressure control structure; multiple layers of pressure control cylinders are coaxially arranged and are fixedly connected with the outer part of the main manifold; a plurality of round through holes are distributed on the wall of the pressure control cylinder of each layer from top to bottom; the round through holes in the walls of two adjacent layers of pressure control cylinders are staggered distributed in a spaced manner; a second manifold is arranged in the casing to form a fourth-stage pressure control structure; large pressure drop exhausted by an atmosphere exhaust opening is dispersed to bear, so that air current discharged from the atmosphere exhaust opening is changed from pressurejump evacuation into pressure gradient evacuation, and further strong jet noise produced by large pressure drop exhaust is avoided; gas is jetted from small holes and is assisted with a resistance sound absorber for further absorbing sound, the internal pressure drop process of equipment can be controlled, atmospheric emission noise is reduced, the noise spectrum quality is improved, and a noise pollution control goal is achieved; the multistage pressure control complex muffler meets the use requirements of an atmospheric exhaust regulating valve for nuclear power on high pressure and mass flow and has good muffling effect.

Description

technical field [0001] The invention relates to a multi-stage pressure-control composite muffler for controlling the noise discharge of the main steam relief valve of the third-generation nuclear power system and the main steam relief valve of other reactor-type nuclear power units, or the discharge pipe of the similar valve. Background technique [0002] Noise pollution is one of the four major pollutions in today's society. The muffler is a device that allows airflow to pass through but can prevent or weaken the propagation of sound waves. It is the main technical measure to reduce aerodynamic noise; It will develop from the 2nd generation, 2nd generation and a half technology to the 3rd generation technology, which will also bring new development opportunities for nuclear power enterprises; the "Nuclear Power Medium and Long-term Development Plan" requires to accelerate the construction of independent nuclear power equipment manufacturing, strengthen research and developme...

AI Technical Summary

Problems solved by technology

[0002] Noise pollution is one of the four major pollutions in today's society. The muffler is a device that allows airflow to pass through but can prevent or weaken the propagation of sound waves. It is the main technical measure to reduce aerodynamic noise; It will develop from the 2nd generation, 2nd generation and a half technology to the 3rd generation technology, which will also bring new development opportunities for nuclear power enterprises; the "Nuclear Power Medium and Long-term Development Plan" requires to accelerate the construction of independent nuclear power equipment manufacturing, strengthen research and development, and focus on Make breakthroughs in the design and manufacturing technology of key equipment; the "Notice of the General Office of the National Development and Reform Commission on Organizing and Carrying out Special Projects for the Development of National Major Technical Equipment" lists "complete sets of equipment for million-kilowatt nuclear power plants" as a special content for the development of national major technical equipment; for example The steam parameters of the VDA system of Hualong No. 1 nuclear power unit are very high, which are higher than those of other nuclear power units such as CPR1000, resulting in high pressure and large flow entering the muffler. Ordinary mufflers cannot meet the requirements of high pressure and large flow, and cannot be effective. Solve the high noise pollution of gas emissions

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