Abstract: the recognition and high pressure resistance to fuel the electro-hydraulic control system information produced by excellent flow meter
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Solstice on June 5, 2002 held in Beijing on June 6, the experts meeting, issued by the state electricity company of the steam turbine control system reform guide has carried on the earnest discussion, the meeting agreed to the following four steam turbine control system modification Suggestions: 1, 100 mw and below.
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Solstice on June 5, 2002 held in Beijing on June 6, the experts meeting, issued by the state electricity company of the steam turbine control system reform guide has carried on the earnest discussion, the meeting agreed to the following four steam turbine control system modification Suggestions: 1, 100 mw and below unit (
Including heating unit)
The turbine oil, recommended electrohydraulic combined control system, or turbine oil pure electric hydraulic control system.
Recommended of 2, 125 mw and 200 mw turbine oil pure electric hydraulic control system.
More than 3, 200 mw unit, it is suggested that by using pure electro-hydraulic control system of turbine oil when using high pressure fuel oil resistant pure electro-hydraulic control system, should be fully demonstrate its necessity.
4, has been transformed into turbine oil electro-hydraulic coexist, track, switch of electric hydraulic control system, if the system is running good, can no longer be changed in principle, but also can according to the actual situation of the unit, further simplify the system, the demolition of the electro-hydraulic switch device, tracking device and other hydraulic components, turbine oil pure electric hydraulic control system is running.
, experts say at the meeting shall be on the high pressure fuel resistance of pure electric hydraulic control system, this is mainly because of the following three aspects: 1, the liquid working medium.
Fire-resistant oil of high ignition point, which is beneficial to prevent fire, with high pressure fuel resistance to reduce oil motive structure size.
As WeiDu fire-resistant oil, however, the current domestic there is no specific effective measures against fuel waste oil processing, fire-resistant oil production factory is a commitment to recycling, but rarely perform, generally USES the barrel storage, or mixed sawdust buried deep, has impact on environmental pollution.
Due to the environmental protection consciousness enhancement, in Europe, fire-resistant oil pollution has been treated with nuclear pollution, France's alstom 300 mw unit, has the original 12 mpa high-pressure fuel resistance of pure electro-hydraulic control system about 7 instead.
0 mpa turbine oil pure electric hydraulic control system, ABB and Siemens on the new units are no longer using high-pressure fuel.
Mitsubishi, Hitachi and Toshiba are by the trend of the development of the high pressure fuel to the turbine oil resistance.
Therefore, starting from strengthen environmental protection consciousness, should be limited resistance to fuel a wide range of applications.
2, according to the survey shows that the control system failure rate after reforming, especially the recent reform unit, high pressure fuel resistance than pure electric hydraulic control system turbine oil relatively pure electric hydraulic control system.
In addition to the electro-hydraulic servo valve failure are more frequent, but also in all kinds of valve leakage, unsmooth,, refusing action and error action of high pressure oil pipe burst;
Unit not the anomalies, such as brake on the oil pump, oil pressure fluctuations, oil pressure to reduce the working point of the drift, lead to system instability.
There are many reasons for the problem, the product quality problem, have a design installation issues, but mostly in oil.
Pure electric hydraulic control system for turbine oil, the purification plant and oil regeneration device take good performance, and the electro-hydraulic converter technology to reduce oil demand, from the practice of transformation, some power plant, was very successful.
3, the valve management issues.
Adopt high fire-resistant oil pure electro-hydraulic control system is one of the reasons, a servo machine can match each regulator, achieve precise adjustable valve management functions.
But, at present the domestic unit configuration basically mix regulating mode of steam distribution mechanism, has the fixed valve management functions, management for adjustable valve, the unit efficiency improvement is not obvious.
Due to the increased operating, so is rarely used.
In imported units are not all Settings, especially in the turbine oil electrohydraulic control system, such as, Hitachi 300 mw turbine oil pure electric hydraulic control system, and is controlled by an electro-hydraulic converter four high pressure regulating valve and set - was achieved by steam distribution mechanism
Therefore, transformed into pure electro-hydraulic control system must have the valve of the concept of management is not comprehensive, also have no need to pursue the valve management function and use of complex system.
At present, the guide is modified opinions, according to the meeting will soon be submitted to the examination and approval of national electric power company, and with the appropriate form.
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