Turbo supercharger surging forecast control device for ship-mounted diesel engine and its control method

Abstract

The invention provides a surging predicted control apparatus and control method for marine diesel engine turbine supercharger. The apparatus comprises a pressure sensor, a speed sensor, a V/F modular converter, a frequency meter, an A/D modular converter, a power module, a surging predicted control unit and an air circulating device, an exhaust gas diffluence apparatus, a data storage and alarm indicator. When controlling, at first rotate speed feeding back by the sensor and fluctuation frequency of the turbine supercharger outlet pressure are received, fluctuation frequencies of the outlet pressure and the peak-peak value fluctuation conditions corresponding under each rotate speed obtained by pretest and measured by fact carry out contrast analysis; If surging foreboding is provided in the analytical result and is prevented by controlling air circulating device; if without surging foreboding, the air circulating device is not operated, the supercharger works normally. The invention can greatly reduce occurrence frequency of supercharger surging incident during working in the marine diesel engine to avoid grave accident.

Description

(1) Technical field [0001] The invention relates to diesel engine turbocharger technology, in particular to prediction and control technology of diesel engine turbocharger surge. (2) Background technology [0002] Surge is an abnormal working state of the engine, which is caused by the air flow in the compressor and the speed of the compressor deviate too much from the design state. Surge is a fatal failure of the engine, which may lead to engine shutdown or even fatal damage to the engine in severe cases, so the surge event is a major problem that cannot be ignored. At present, most of the authorized invention patents are applied to the field of industrial compressors. Only the United States General Corporation applied in China on June 4, 2004, entitled "Automatic Detection and Avoidance of Engine Turbocharger Surge Device and The invention patent of "method" is related to the engine supercharger. Its technical method is to judge whether surge occurs by measuring the speed...

AI Technical Summary

Problems solved by technology

Generally speaking, surge events are prone to occur at the inlet of the supercharger with low air flow or high pressure ratio, which causes the supercharger vanes to be forced to work under such high incident angle conditions, resulting in Obvious separation of airflow will generate strong airflow fluctuations in the supercharger, which may damage the supercharger or diesel engine and lead to major accidents

According to the reason of the surge, the surge is mainly caused by the vane diffuser. Usually, the position of the surge line is changed by changing the throat area of ​​the vane diffuser to reduce the surge phenomenon. probability, but the operating conditions of the engine are always changing, the above method can only work within a certain range, has certain limitations, and does not have real-time prediction and control functions

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