TCONDENSER - AUXILIARIES OF STG SETS -ABC OF THERMAL POWER PLAN

Till last dispatch I have given an outline of  Turbine ,Generator erection including some   detail of integral piping specially  Lube oil ,control oil , drain lines ,seal steam  lines etc. From today onwards   I will describe the major auxiliaries likes Condenser , pumps and their drive turbines , heaters and other items . I receive number of mails from supervisors and young engineers for auxiliaries erection details therefore  I will try to answer all their queries in my subsequent dispatches. 

In my working time I have come across two distinct type of set one is Russian and other is German. For a given capacity like 200 MW set Russian condenser work is very less compare to German condenser. Russian condensers are pre- fabricated  up to tube supporting plate and box has to inserted and assembled . However for German design set like KWU /Siemens every item needs to be assembled i.e. starting from base assembly to the making of the box therefore time  taken for condenser erection is more than Russian set. I have never worked in Chinese sets therefore feedback is not available with me. I request readers to enlighten me in this regard. One more recent development in 660MW Siemens deign the base plate is tilled half a degree and instead of spring support bearings are provided below the base plate. There may be some other changes but not that significant during erection.

I will outline my discussion based on BHEL make 500MW. However I will use photographs of 660 MW set so readers should not get confused about the size.

   
  The condenser is a box type construction with divided water box design double flow; two pass 

which facilitates the operation of one half of the condenser while other half is under maintenance. 

The steam space is of rectangular cross-section with integral air-cooling  section from where air and non–condensable gases are drawn out with the help of air evacuation equipment.

The surface condenser is mounted on spring supports. The condenser is welded with   the exhaust hood of the low-pressure turbine. The tube plates are welded with the water chambers. Condensers are provided with domed shape water box. The condenser tubes are supported within the condenser shell by tube support plates. The condenser is installed in such a way that all condenser tubes are drained automatically into the condenser water Condition has been provided with an extension suitably to connect it to the turbine exhaust opening. Adequate internal clearance is provided. The rigid construction results in a sound-condenser combination for trouble free operation.  

The water boxes of the condenser have been designed for smooth entry and uniform distribution of cooling water to all the tubes. The water boxes are removable type and have been provided with necessary hinged manholes for easy access to the interior for inspection. Each water box has been provided with a vent and drain connection. The circulating water connections of adequate size have been provided with water boxes. The condensate produced in the condenser & drains entering through flash vessels collect in the hot well from where the pass to the condensate pumps.

CONTINUED PART -II

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