Studies On The Technical Rebuilding For The Check Valve In The Blast Furnace Axial Flow Air Compressor System

The butterfly disc non-slam check valve is a kind of universal mechanical product.It's primary structure produced by domestic enterprise is the same as the master frame manufactured by foreign corporation.But it's seal type and temperature range is dissimilar.In normal the butterfly disc non-slam check valve operatin,the butterfly disc is opened by forward flow to a position where flow and gravity forces are blanced.With loss of forward flow the butterfly disc non-slam check valve will auto-close as the hydraulic damper permits smooth non-slam closure. The butterfly disc non-slam check valve is self-action valve for this feature.It has a disadvantage as higher pressure loss.The check valve is equipped by the blast furnace axial flow air compressor traditionarily.The check valve has been rebuilt technically in this paper.That is to set up a control system for the check valve.Not only the function to open and close the butterfly disc for the check valve has not been changed,but also the capability of economizing energy has been had.Meanwhile the abilities of anti-surging and anti-countercurrent have been perfect.First of all the basic study bas been carried out for the check valve in this thesis.That is to analyze the rotative movement and to calculate and measure the pressure loss and to account and test the open force and close force for the butterfly disc of the check valve.The research result have showed that the rotatory montion can be performed in the opening range of 0°-90°successfully and the pressure loss has been reduced greatly when the opening was increased a little and the open force is greater than the close force for the butterfly disc of the check valve.Afterwards the rebuilding aim has been put out for the check valve in this article.The rebuilding schemes have been compared to each other and has been selected.The conditions and the technical demands have been brouhgt forward definitely for the executing frame work of the blast furnace axial flow air compressor check valve control system. The scheme argumentation and the scheme design of the executing frame work have been finished. The working principle of the executing frame work has been introduced.The choice of design type for the executing frame work has been accomplished. We have obtained the virtual assembly drawing for No.0 and No.1 executing frame work of the blast furnace axial flow air compressor check valve control system as a result of we have fulfilled the design of the executing frame work for appling CAD fuction of the UG technology.The treatise has summarize the control party and the signal detection party for the blast furnace axial flow air compressor check valve control system. The emphasis is to present the scheme design of the airflow sensor for the signal detection party.The dissertation has illustrated the principle and effect of economizing energy for the rebuilt check valve while the loss and efficiency were stated for the air compressor. The national total furnishment capability of universal machine for the fanner and compressor is 160 million kW and it's consuming electrical power is 2/3 of national consuming electrical power and is 40 per cent of consuming electrical power in the industry for 32000 million kW annually based on the statistic data for the national 3th industry investigation. The furnishment capability of fanner is about 49 million kW and the furnishment capability of pump is about 10 million kW thereof. The metallurgy industry has been equipped by a part of axial flow air compressor therein. If the check valve opening increases from 40°to 60°, the lossed shaft horsepower of axial flow air compressor decreases 21 per cent based on the analysis and calculating in this paper i.e. the shaft horsepower of axial flow air compressor can be economized 21 per cent. Therefore,more effect of economizing energy bring about in the metallurgy enterprise after the blast furnace axial flow air compressor check valve control system rebuilt can be used. This paper has analyzed the capability of auto-prevent and auto-control surge for the rebuilt check valve while the phenomena and the mechanism and the harm and the method of distinguish and prevent and control for the surge have been explained. The discourse has analyzed the anti-countercurrent performance of the rebuilt check valve while the phenomena of countercurrent and the measure to prevent and control countercurrent have been introduced.The testing condition and ways and means and result in the corporation have been expounded for the blast furnace axial flow air compressor check valve control system in the end. The function analysis and the analyses of elevating force and maintaining force have been carried through in the paper for the executing frame work and the control party and the signal detection party of the control system.