Overview and structural characteristics of the but

2022-07-30
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Overview and structural characteristics of flue butterfly valve

in the nickel smelting system and supporting flue gas chemical product pipes, the flue butterfly valve is mainly used to regulate and treat the flue gas from pyrometallurgical smelting (such as the flue gas from flash furnace, converter, copper synthesis furnace, oxygen enriched top blowing smelting furnace or dilution furnace). Precision is the experimental force value of the tested spring. Ore drying is one of the main processes for material preparation in the smelting system. This process is to mix the wet concentrate from Beneficiation with a water content of 8% - 10% with the hot gas generated by pulverized coal combustion, and dry the dry concentrate with a water content of ≤ 013% through "Three-stage" airflow. The flue gas acid plant mainly includes purification, conversion, dry absorption, acid storage and other units. The flue gas produced by smelting and the flue gas used for acid making have high temperature and large catalyst dust, which has corrosion and retardation effect on pipeline valves. The structure of the flue butterfly valve for smelting and acid making pipes shall be designed according to its working conditions, so as to avoid that the flue butterfly valve cannot be opened and closed normally due to thermal deformation, dust binding on the valve wall and pipe dust blockage, which will affect the normal operation of smelting and chemical equipment

structural characteristics of flue butterfly valve

from the analysis of standard provisions and actual use, when flue butterfly valve is used for medium cut-off or adjustment, its sealing performance requirements are different from metal sealing butterfly valve. As a dust laden flue gas control equipment, there is still a certain gap in the closed position, which will not affect the automatic control of the opening adjustment of the pipeline to achieve the furnace pressure. The fluid characteristics of flue butterfly valve and metal seal butterfly valve are similar, and the relationship between the opening of butterfly valve and flow is basically linear proportional. If it is used to control the flow, its flow characteristics are closely related to the flow resistance coefficient of the supporting pipeline. If the diameter and form of the valve installed in the two pipelines are identical, and the pipeline loss coefficient is different, the flow of the valve will vary greatly. If the valve is in the state of large throttling range and the butterfly plate is in the middle opening, the upper and lower sides of the butterfly plate can form a completely different state during the closing process. The front end of the butterfly plate on one side moves along the flow direction of the medium, and the other side moves against the flow direction of the medium. Therefore, the valve body and butterfly plate on one side form a nozzle like opening, while the other side is similar to an orifice like opening. The flow rate at the nozzle side is much faster than that at the throttle side, and the throttle side often generates negative pressure. Therefore, when the flue butterfly valve is installed horizontally, the nozzle side should be placed at the lower part of the pipeline to avoid the occurrence of ash blockage at the connection of pipeline valves

the flue butterfly valve is mainly used to intercept and regulate the flow, especially the large-diameter butterfly valve. There are many deformation factors affecting the valve under working conditions and the deformation is difficult to control, so the structural design should consider the influence of environmental factors. The radial seal of the flue butterfly valve is similar to the metal seal butterfly valve in structure. It is easy to generate thermal jam due to temperature during application, which affects the opening and closing of the valve

the flue butterfly valve is ideal for plane sealing, which can be designed as a vertical plate or inclined plate structure (as shown in the above figure). The valve body and butterfly plate take the side plane as the sealing pair. The outer diameter of butterfly plate can meet the growth of China's plastic machinery industry. It has ushered in the golden age of Kemen's growth and rapid growth. It is smaller than the valve body diameter. It can be easily opened even if the inner cavity and pipe wall of the valve are bonded. The pipeline deformation has an impact on the sealing performance of the valve body so that the automobile can stop safely. There is no obvious radial sealing effect of the servo valve as a tool often used in the experimental machine. The symmetry of the sealing surface of the valve body of this structure is required to be high. In particular, the sealing side plane of the valve body of the inclined plate structure is difficult to be machined on ordinary mechanical equipment. Only by arranging a reasonable process can the assembly accuracy achieve the ideal sealing effect. If the lever type sealing structure is adopted, the problems existing in the processing of the sealing plane can be solved whether the vertical plate or the inclined plate structure is used. The structure has many advantages. The sealing surface of the lever structure valve is a side plane seal, which will not produce radial jamming. In addition, the sealing side planes of the valve body and butterfly plate are processed as a whole in a continuous plane, and the outer diameter of the butterfly plate is designed to be smaller than the drift diameter of the valve body. During the closing process, the butterfly plate rotates first and then moves horizontally. The more the sealing surface is pressed, the tighter the sealing surface is. During the opening process, the butterfly plate rotates first and then moves horizontally without jamming. The flue butterfly valve generally works under the environmental conditions of low pressure and high temperature, which will not affect the opening and closing of the valve

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