Turbine Warm start up
1.) The start model of turbine is decided by the inner metal temperature of HP inner casing upper governing stage before start turbine
cold start up:≤150℃         Â
warm start up:150℃～300℃
hot start up:300℃～400℃    Â
extremely hot strart up:≥400℃
2.) The power of equipment’s and valves belongs to turbine side should in the working position.
3.) The flowing systems should be put into operation: CW system, ACW system, CCW system, compressed air system, DM water and make up water system, condensate water system, deaerated water system, lube oil system, jacking oil system, turning gear, EH oil station and control system, by pass oil station and control system, main turbine protection system, vacuum system, all the interlock of every equipment should be put into operation.
4.) After running the gear, check and record the eccentricity of rotor, compare the same with original reading in the manual. If the change is less than 0.03mm, it means nothing has happened. The flow path part also should be listened, make sure the gear keep running for more than 2 hours.
5.) Feed water to boiler to light up
6.) Put the drain system of main steam line to warm pipe
7.) After the temperature of main steam gets to 200℃, warming up the pipeline of turbine steam gland system, interlayer heating system and the pipes from main steam to auxiliary steam system.
8.) For clod start up, the pressure of gland main pipe should 0.128MPa, temperature should 120℃~180℃
9.) For the warm start up, the pressure of gland main pipe should 0.128MPa, temperature should 150℃~250℃
10.) For hot and extremely hot start up, the pressure of gland main pipe should 0.128MPa, temperature should 250℃~350℃.
11.) Put the vacuum system into operation
12.) After the vacuum is lower than 20KPa, put the turbine drain system and HP/LP bypass system. HP/LP heater system also should start up along with the turbine.
13.) Keep rising the temperature and pressure of boiler, after gets to the followings parameter, prepare the turbine rolling:
warm start-up with variable parameters
pressure of main steam          1.6MPa
temperature of main steam         400±10℃
temperature of reheated steam       330℃
hot start-up with variable parameters
pressure of main steam         3.6MPa
temperature of main steam      440℃±10℃
temperature of reheated steam       410℃
extremely hot start-up with variable parametersÂ
pressure of main steam          4.5MPa
temperature of main steam       510℃±10℃
temperature of reheated steam       480℃
14.) Latch on the turbine and Open the main valve, make the local and remote trip test. Pay attention to the shaft critical rotate speed(calculation value)
first stage     1309r/min        Â
second stage     1850r/min        Â
third stage    2116r/min        Â
forth stage     3584r/min Â
15.) The guide pipe should be warmed up for 10minutes, put the casing interlayer heating pipes into operation.
16.) Put all the protection into operation except the generator fault and vacuum protection. Record all the operation parameters before rolling, the LP casing spay system should be put into operation automatically, and it will open after the temperature of exhaust steam is more than 80℃.
17.) Rolling the turbine without the HP/LP bypass, the speed-increasing rate of warm start up is 150RPM/min, the speed-increasing rate of hot and exremely hot start up is 250 RPM/min, target speed is 500RPM, when the turbine begin to rolling, check the turning gear in local, it should out of operation and stopped. If it was not, stop turbine and find out the reason.
18.) make the rubbing check after the unit gets to 500RPM, check rubbing condition of turbine steam gland and generator shield, check the HP exhaust check valve whether in the wholly-opened condition, but the stay time should less than 5 min.
19.) rubbing check test, latch on the turbine and rise the speed, the speed increasing rate of warm start up should be 150RPM/min, and the same for hot and extremely start up should be 250RPM/min, target speed is 3000RPM, when the turbine speed is 1200RPM, the jacking oil pump should be stopped interlocking. After fix the speed to 3000RPM, switch over it to the main oil pump. The pressure of condenser should less than 12kPa.
20.) Put the system which from gland sealing and leakage to deaerator into operation. Open the pipe draining.
21.) Unit synchronization. The control system should load 3% loads automatically, then put the generator fault and vacuum lower protection.
22.) According to the curve of warm start-up with variable parameters, rise the load to 13.5MW with the speed of 3MW/min, and keep it for 20 min of warming up.
23.) During the hot start up, accord to the curve of start-up with variable parameters, rise the load to the rated value with the speed of 5MW/min
24.) During the extremely hot start up, accord to the curve of start-up with variable parameters, rise the load to the rated value with the speed of 6MW/min
25.) According to the pressure of extraction steam, put the heating steam source which form third extraction to deaerator into operation.
26.) If the loads gets to 80% of rated loads, make the vacuum sealing test.
