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Axial flow compressor and acidification material technology
Author: 志和      Release Date:2014/7/21      View Count:1880
 

Axial flow compressor (axial flow compressor compressed air generated by thecontinuous flow, and the flow of large capacity and high efficiency and quality of the benefits, especially in the section. However, they need a few lines of wing large pressure increased, the relative to other air compressor(such as centrifugal air compressor) is more complex and expensive.) With respect to the control of centrifugal compressor to complex. It mainly includes the main air flow of 2 stationary blade positioning control systemof anti surge control system and interlock control system.

The anti surge control of turbine air compressor surge is (turbine air compressor is powered air compressor has the advantages of high speedrotating impeller. In fact, principle of turbine air compressor and the ordinary centrifugal pump is similar, only different compression Series). An inherent characteristic, especially the axial flow compressor surge, the harmcaused by the more serious, in order to prevent axial flow compressor to runclose to the surge, anti surge protection system must be reliable.

The anti surge control theory:

Exhaust pressure axial flow compressor as the PV value, throat differential pressure of the axial flow compressor and the arbitrary polygonal functiongenerator operation as the SV value (surge line, and the axial flow compressor surge line of actual safety margin 5% ~ 10%). Steady stateoperation, the PVSV, anti surge control system work, quickly make open a point of anti surge valve, so that the operating point falls in the antisurge line below the stable operating region.

Design of anti surge system set up the following six special functions (in order to ensure the reliability, sensitivity and stability of the system):

 proportional integral (PI) control operation, not only to ensure the safe and reliable operation of the unit, and can make the anti surge valve openingto the minimum, the minimum energy consumption;

 using arbitrary polygonal function, so that the surge line provided moreaccurate;

I set the surge line automatic moving function, the unit after a long-term operation due to various factors cause the actual surge line changes and thesurge line can be modified, to ensure safe operation;

I set the asymmetry of the output processing function, improve system stability.

I set the anti windup function, make the system run more accurate, more quickly;

I set up a dynamic compensation function, make the change control role in themutation operation conditions with the change of working condition speedstrength, avoid unit into operation risk region;

In the air supply pressure sulfuric acid process requirements of axial flowcompressor is very low, because of considering the unit safety and process medium with acidic, usually by playing back the anti surge control scheme.The anti surge valve before and after the pressure difference is small, largeflow rate, so it is usually anti surge valve larger diameter. Constant air volume / constant pressure vane positioning adjustment according to the requirement of sulphuric acid process, in charge of sulphur furnace volumeconstant, requirements for fixed running fan in one operating point. If thecharge quantity changes, axial flow compressor will be based on thetechnology of resistance size, automatically change the operating point(resistance is large, the pressure increases, the flow becomes smaller;resistance is smaller, the pressure decreases, the flow increases). This axisflow compressor according to the process condition change request choice to realize the constant air volume / constant pressure switch operation.

Flow measurement of the venturi tube with axial flow compressor exhaust pipe,the differential pressure signal by the temperature and pressure compensationoperation income = actual flow measurements, and as a flow regulating PV value, use the keyboard to set the flow as the SV value, the output signalZhi Jing leaf electric actuator through a flow control after the PID operation, change static blade angle to control the axial flow compressor,constant air volume control purposes. Constant air volume / constant pressurepositioning adjustment principle of the same, when the unit selectionconstant pressure adjusting operation, axial flow compressor discharge pressure as PV values, use the keyboard to set pressure as the SV value, thepressure regulating PID operation after the output signal to the statorelectric actuator, change the static blade angle, to control the axial flowcompressor constant pressure regulation goal.

Reminder.

Chronicles and the electromechanical device limited company to recommend air compressor, water heater, air compressor heat recovery equipment, as long as you have the air compressor factory, can 0 operation cost of producing hot water and heating.

See details > >

(this paper mainly tells the axial flow compressor and acidification ofmaterial technology, but in the actual in the problem solving process is for reference only.)

 
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