Dadri stage-1 start up tables

 

TURBINE START UP TABLES(210 MW)

 

The following tables have been formulated to give a comparative reference of the important turbine side activities against important parameters for bringing up of a unit up to full load. The time at which HP and LP bypass warm up pipes are cut in is used as a reference for further turbine side activities. The HP and LP bypass are expected to be cut in after the boiler has been fired and the corresponding parameters have been achieved.

 

1) ABSOLUTE COLD STARTUP (AFTER 250 HRS SHUT DOWN)

 

 

Time (min)	Activity	Steam Temperature (C)		Steam Flow (tph)	Steam Pressure(ksc)		Speed (rpm)	Load (MW)
		SH	RH		SH	RH
0	Cut In HP Bypass warm up pipes	160-180		20	5
34	Cut in LP Bypass( Raise firing)	220-230	250-310	30	12	4
62	Open ESV for warming	265-275	310-350	70	24	4
74	Raise Speed Set Point to 540 rpm	270-280	320-350	70	30	4
100	Speed= 540 rpm	320-330	350-375	70	30	4	540
129	Raise Speed Set point to 3000 rpm	360-365	370-385	70	30	4	540
133	Speed= 3000 rpm	370	380-390	70	30	4	3000
137	Synchronize	370	380-395	110	30	4	3000	08
155	Cut in Ist Mill	380	405-415	150	35	4	3000	24
173	Cut in IInd Mill	415	425-430	220	48	10	3000	45
177	Cut in D/A from CRH	425	430-440	235	55	11	3000	56
181	Cut in HP HEATERS	440	435-440	365	64	12	3000	65
205	Cut in IIIrd Mill	460	460	520	100	18	3000	108
225	Cut in IV Mill	480	480	640	147	25	3000	150
290	Reach 100% turbine flow	515	515	640	149	34	3000	200
325	Reach 210 MW	540	540		149	34	3000	210

 

 

NOTES:-

1.    Aux Steam is available from external source.

2.    Steam Temperature downstream of HP Bypass need not be regulated by spray until the main steam temperature is above 300 deg. Then HP Bypass downstream temperature may be regulated to 230 deg.

3.    The D/A drawn from CRH is expected to be cut in after synchronization and at least 20% loading is done. HP heaters may be cut in afterwards at 30% load.

4.    SH spray need not be used for controlling SH temperature until the boiler flow is 160 T/H. SH and RH temperature may be regulated and allowed to rise along the suggested curve at higher loads.

 

 

 

2) AFTER 160 HOURS SHUT DOWN

 

 

Time (min)	Activity	Steam Temperature (C)		Steam Flow (tph)	Steam Pressure(ksc)		Speed (rpm)	Load (MW)
		SH	RH		SH	RH
0	Cut In HP Bypass warm up pipes	140-165		10	4	2
35	Cut in LP Bypass( Raise firing)	220-230	250-315	35	12	4
65	Open ESV for warming	255-270	285-335	65	26	4
75	Raise Speed Set Point to 540 rpm	275-285	310-350	65	28	4
85	Speed= 540 rpm	290-305	320-360	65	30	4	540
90	Raise Speed set point to 3000 rpm	300-310	325-365	65	30	4	540
93	Speed =3000 rpm	305-320	330-370	65	30	4	3000
97	Synchronize	305-320	335-370	65	30	4	3000	12
103	Cut in Ist Mill	330-350	355-385	75	30	6	3000	28
121	Cut in IInd Mill	360-370	380-400	120	42	11	3000	50
129	Cut in D/A from CRH	365-380	385-405	150	48	12	3000	55
133	Cut in HP HEATERS	380-395	400-415	165	52	14	3000	65
155	Cut in IIIrd Mill	415-425	425-435	315	90	24	3000	90
195	Cut in IV Mill	475	475	570	149	34	3000	180
225	Reach 100% turbine flow	510	510	640	149	34	3000	205
270	Reach 210 MW	540	540	640	149	34	3000	210

 

 

Notes:-

1. The metal temperature anticipated: HP Casing-140 deg, STV 50 deg and boiler at ambient temp.
2. Aux Steam is expected to be available from external source.
3. Steam Temperature downstream of HP Bypass need not be regulated by spray until the main steam temperature is 300 deg. afterwards, it may be regulated to 230 deg.
4. The D/A drawn from CRH is expected to be cut in after synchronization and at least 20% loading is done. HP heaters may be cut in afterwards at 30% load.
5. SH spray need not be used for controlling SH temperature until the boiler flow is at least 160 T/H. SH and RH temperature may be regulated and allowed to rise along the suggested curve at higher loads.

 

3) AFTER 36 HOURS SHUT DOWN

 

Time (min)	Activity	Steam Temperature (C)		Steam Flow (tph)	Steam Pressure(ksc)		Speed (rpm)	Load (MW)
		SH	RH		SH	RH
0	Cut In HP and LP Bypass	190-215		10	10	4
21		245-275		50	12	4
51	Cut in Ist Mill	310-330	370-380	100	30	8
56	Cut in D/A from CRH	330-345	375-385	115	36	10
61	Open ESV for warming	305-360	385-390	125	38	11
81	Roll Turbine to 540rpm	420	395	165	60	12
84	Speed =540 rpm	420	395	165	60	12	540
87	Raise speed set point to 3000 rpm	420	395	165	60	12	540
89	Speed =3000 rpm	420	395	165	60	12	3000
91	Synchronize	420	395	165	60	12	3000	16
101	Cut in IInd Mill	420	405	170	60	13	3000	44
113	Cut in HP HEATERS	440	425	250	82	18	3000	76
126	Cut in IIIrd Mill	465	450	380	106	24	3000	116
131	Cut in IV Mill	475	470	465	125	30	3000	144
146	Reach 100% turbine flow	495	495	640	149	34	3000	180
171	Reach 210 MW	540	540	640	149	34	3000	210

 

Notes:-

1. The metal temperature anticipated: HP Casing-350 deg and STV-210 deg
2. Aux Steam is expected to be available from external source.
3. D/A is to be kept pegged at 140 deg minimum before firing the unit
4. Only D/A steam is extracted from CRH until synchronization. HP heaters are anticipated to be put into service after synchronization.
5. Steam Temperature downstream of HP Bypass need not be regulated until 90 tph bypass flow is established. Afterwards, it may be regulated to 260 deg.
6. SH spray need not be used for controlling SH temperature until the boiler flow is 120 T/H.
7. RH temperature may be regulated by spray if required, after HP bypass closes..

4) AFTER 8 HOURS SHUT DOWN

 

 

Time (min)	Activity	Steam Temperature (C)		Steam Flow (tph)	Steam Pressure(ksc)		Speed (rpm)	Load (MW)
		SH	RH		SH	RH
0	Cut in HP & LP Bypass	375-410		50	66	12
4	Raise Firing	385-415	400-425	60	70	12
12	Cut in Ist Mill	425-440	425-455	95	80	12
18	Cut in D/A & HP HEATERS from CRH, Cut in IInd Mill	450-460	450-470	160	84	12
28	Open ESV for warming	490	465-475	235	92	12
30	Raise Speed Set Point to 540 rpm	500	475-480	245	98	12
34	Speed = 540 rpm	505	490	255	100	12	540
36	Raise Speed set point to 3000 rpm	510	495	255	100	12	540
38	Speed = 3000 rpm	515	500	255	100	12	3000
40	Synchronize	520	500	255	100	12	3000	16
47	Cut in IIIrd Mill	530	520	325	108	14	3000	100
57	Cut in IV Mill	535	530	500	128	26	3000	164
64	Reach 100% Turbine Flow	535	535	640	149	32	3000	204
72	Load=210 MW	540	540	640	149	34	3000	210

 

 

Notes:-

1. The startup is 8 hours after a full parameter trip and boxing up.
2. The metal temperature anticipated: HP Casing-465 deg and STV-410 deg
3. Aux Steam is expected to be available from external source.
4. D/A is to be kept pegged at 140 deg minimum before firing the unit
5. Full vacuum must be available before firing.
6. Steam Temperature downstream of HP Bypass need not be regulated until 50 tph bypass flow is established. Afterwards, it may be regulated to 300 deg.
7. SH spray need not be used for controlling SH temperature until the boiler flow is 160 T/H. SH and RH temperature may be regulated and allowed to rise along the suggested curve at higher loads.