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1、A2012.03CFC李想肖雄军梁石黄瑾First issue版次日期状态编写校对审核批准修改-说明GUANGXI FANGCHENGGANG NUCLEAR POWER STATION PROJECT PHASE 1 (2X1000MW)广西防城港核电厂一期(2X1000MW)工程DOC. NOBLX17AHP006GKS045GNTITLE:题目SYSTEM DESIGN MANUALHP FEEDWATER HEATER SYSTEM（AHP）CHAPTER 6CONTROL高压给水加热系统(AHP)系统设计手册第六章参考电站编码Reference DocumentREV.C A T E

2、 G O R YA: Identical（+FCR，FCN，DEN，CIN，OROTHERS，IFANY）B: ModifiedC: NewIssued by综 合 甲 级号：A144004317GEDI省电力GUANGDONG ELECTRIC POWER DESIGN INSTITUTE设计院内部编码44-H0201S-K2502Internal Identification NumberThis document is the property of GEDI. It must not be used, reproduced, transmitted or disclosed witho

3、ut the prior written permission of GEDI. 本文件之产权属于 省电力。未获我院 ，任何人不得擅自使用、 、传递或泄露该文件。批准：审核：校核：设计：会签：MODIFICATIONSREVDATECHAPTERPAGEMODIFICATIONSA2012.03First issueCHAPTER 6-CONTROL6.0 Main reference drawings- Instrumentation and Control Flow Diagrams (I.C.F.D.s): BLX17AHP550GKS045DD (see Chapter 10)- Sc

4、hedule of Analogue Sensing Elements: BLX17AHPN09GKS045GN (see Chapter 9.3)- Schedule of On/Off Sensing Elements: BLX17AHPT09GKS045GN (see Chapter 9.3)- Schedule of Electrical Actuators: BLX17AHPE09GKS045GN (see Chapter 9.3)- Control Logic Diagrams: BLX17AHP016GKS045DD (see Chapter 6.2)- Analogue Dia

5、grams: BLX17AHP026GKS045DD (see Chapter 6.3)1/48BLX 17AHP 006 GKS0 45GNGUANGDONG ELECTRIC POWER DESIGN INSTITUTESHEET 6.06.1 Control Bases6.1.1 Level Control - AnalogueSteam supplied to the HP heaters for feed heating purposes is bled from the HP turbine. The heaters also receive condensate from the

6、 M.S.R. live/bled steam drain receivers, The steam is condensed by feedwater passing through the heater tubes and is drained from the heater shells in a controlled manner. The system is identical on each bank of the HP heaters. The drains flow from the HP heaters throughair-operated drain control va

7、lves which maintain the level in the heaters at a fixed set point. The valves are regulated by KIC controllers connected to level transmitters fitted on the heater shells.Normal heater drainage is as follows:From HP heater No. 7 to HP heater No. 6.From HP heater No. 6 to deaerator (controlled).In th

8、e event that the normal drain valves are unable to cope with excess drain flow, the level in the heater rises until it comes within the influence of an emergencyhigh-level control system similar to the normal level control. The excess drains from HP7 and HP6 heaters are directed to the condenser by

9、air-operated control valves which are regulated by separate KIC controllers. These high-level controllers receive signals from separate level transmitters on the heater shells, and have a level set-point which is 200mm higher than the normal level set point.In the HP7 heaters, operation of the high

10、level control valves caused by excess flow indicates possible heater tube leakage, and an alarm "DRAIN FLOW HI" valve limit switches. This is also the case for HP6 heaters above 40% load. The pressure in HP6 heaters is insufficient to overcome the combined effect of the deaerator pressure

11、plus the head of water up to the deaerator. The level rises even though the flow is not excessive. The high level control valves therefore direct the flow to the condenser, but the valve operation alarm suppressed by a pressure switch which senses when HP6 heater pressure is insufficient.The level t

12、ransmitters are of displacement type (LVDT) to produce a 4-20mA signal. This acts controllers to regulate the valves as required, maintaining the water level above the drain cooling zone of the heaters. If any of the controllers should malfunction, control of the relevant valves may be carried out u

13、sing AUTO/ MANUAL Control Stations in the KIC.2/48IssueABCDEFGDate2012.03BLX 17AHP 006 GKS0 45GNGUANGDONG ELECTRIC POWER DESIGN INSTITUTESHEET 6.16.1.2 Level SwitchesEach HP heater has duplicated sets of level switches to ensure the following functions:(i) Alarm on high water level, to alert the ope

14、rator of possible tube leaks.(ii) Alarm and Opening of emergency high level drain control valves to condenser on high- high water level.(iii) Alarm and Isolation of the affected heater bank (A or B) on high-3 water level. (iv)Double verification that level has returned to normal before heater bled s

15、team and feedwater supplies are reinstated.(v) Alarm on low water level, to alert the operator of possible steam entrainment within the drain cooling zone.(vi) Duplication also permits the level switches to be tested on-load. The automatic action on rising and falling water levels is detailed below:

16、-NoteR F Dindicates rising level indicates falling levelIndicates duplicated switches.6.1.2.1 HP Heaters No 6A and 7AAHP601-701 RE Any switch level 1 -FD:- Alarm "LEVEL LO"Any switch level 2-RD:- Alarm "LEVEL HI"Any switch level 3-RD:- Alarm "LEVEL HI HI"- Fully opens N

17、o. 6A and 7A heater high level drain to condenser control valves AHP118VL and 120VL.Any switch level 4-RD:-Alarm "LEVEL HI 3"Applies closing signal to bled steam N.R.V.s GPV0651VV, GPV0751VV. (Note, the N.R.V.s may be not closed because of the high pressure bled steam in fact, and on the K

18、IC status discrepancy may activate. closure of GPV0651VV & GPV0751VV will also temporarily interrupt bled steam supplies to 'B' bank heaters, little changes will happened)Closes Bank A bled steam isolation valves AHP101VV and AHP103VV. (Closure of AHP101VV &103VV or return of water t

19、o below level 4 releases closing signal to GPV0651VV /0751VV N.R.V. and reopens N.R.V. if bank B bled steam isolation valve AHP201VV/203VV are not closed thereby reinstates bled steam supplies to 'B' bank heaters.).Closes Bank A F.W. inlet and outlet isolation valves AHP101-102VL&112VL,

20、and opens bypass valves AHP019VL and AHP009VL.-3/48IssueABCDEFGDate2012.03BLX 17AHP 006 GKS0 45GNGUANGDONG ELECTRIC POWER DESIGN INSTITUTESHEET 6.1-Closes the drain control valves from the 'A' bank M.S.R. live steam and bled steam drains receivers GSS1202VL, 1302VL, 1204VL & 1308VL.All s

21、witches level 2-FD:-Permits operator to open F.W. outlet valve AHP102VL&112VL, then F.W. inlet valve AHP101VL provided 102VL is fully open.Permits operator to close F.W. bypass valve AHP009VL provided valves AHP101-102-201-202VL are fully open.Permits operator to open B.S. isolation valves AHP10

22、1 VV and 103VV (providing no turbine trip signal exists).Permits N.R.V.s GPV0651VV and 0751VV to open (proviso as above).-All switches level 3-FD:-Restores GSS1202VL and 1302VL to modulating control (M.S.R. drains). Restores GSS1204VL & 1308VL to open.Restores AHP118VL and 120VL to modulating co

23、ntrol (Hi level drains).Note, last 2 actions apply provided AHP101/102VL are both fully open.6.1.2.2 HP Heaters No. 6B and 7B AHP602-702RE Any switch level 1-FD:- Alarm "LEVEL LO"Any switch level 2-RD:- Alarm "LEVEL HI"Any switch level 3-RD:-Alarm "LEVEL HI HI"Fully ope

24、ns No. 6B and 7B heater high level drain to condenser control valves AHP218VL and 220VL.Any switch level 4-RD:-Alarm "LEVEL HI 3"Applies closing signal to bled steam N.R.V.s GPV0651VV and GPV0751VV. (Note, the N.R.V.s may not be closed because of the high pressure bled steam in fact, and o

25、n the KIC status discrepancy may activate. closure of GPV0651VV and GPV0751VV will also temporarily interrupt bled steam supplies to 'A' bank heaters, little changes will happened)Closes Bank B bled steam isolation valves AHP201VV and AHP203VV. (Closure of AHP201VV valve or return of water t

26、o below level 4 releases closing signal to GPV0651VV and GPV0751VV N.R.V. and reopens N.R.V. if bank A bled steam isolation valve AHP101VV/103VV are not closed thereby reinstates bled steam supplies to 'A' bank heaters.).Closes Bank B F.W. inlet and outlet isolation valves AHP201-202VL&2

27、12VL, and opens bypass valves AHP019VL and AHP009VL.-4/48IssueABCDEFGDate2012.03BLX 17AHP 006 GKS0 45GNGUANGDONG ELECTRIC POWER DESIGN INSTITUTESHEET 6.1-Closes the drain control valves From 'B' bank M.S.R. live steam and bled steam drains receivers GSS2202VL, 2302VL, 2204VL & 2308VL.All

28、 switches level 2-FD:-Permits operator to open F.W. outlet valve AHP202&212VL then F.W. Inlet valve AHP201VL provided 202VL is fully open.Permits operator to close F.W. bypass valve AHP009VL provided valves AHP101 -102-201-202VL are fully open.Permits operator to open B.S. isolation valves AHP20

29、1VV and 203VV (providing no turbine trip signal exists).Permits N.R.V.'s GPV0651VV and GPV0751VV to open (proviso as above).-All switches level 3-FD:-Restores GSS2202VL and 2302VL to modulating control (M.S.R. drains). Restores GSS1204VL & 1308VL to open.Restores AHP218VL and 220VL to modula

30、ting control (Hi level drains).Note, last 2 actions apply prodded AHP201/202VL are both fully open.6.1.2.3 Level Switch On-Load TestingDuplicate level switch mounting columns are provided on all heaters in order that the heater tripping switches may be tested with the unit on load. This is achieved

31、by temporarily disconnecting a column of level switches from the various control circuits, then simulating a high or low level in that column.Local On-Load Test Boxes are provided (typical reference is AHP001BM); each box has a 3-way selector switch marked "TEST COL.A-NORMAL -TEST COL.B".I

32、n the normal position, the level switches adescribed in 6.1.2.1 and 6.1.2.2.When the selector is turned to TEST COL.A an alarm alerts the CCR operator thatabeing carried out. In this position, the level switches in Column A areinactive. However security is still maintained by the switches in Column

33、B. The top isolating valve connecting Column A to the heater is closed; the entrapped steam in the Column will cool and condense, creating a zone of reduced pressure. Pressure within the heater forces more water into the column (this may be observed by using the column sight glass). When the level r

34、ises above the high level switches, lamps on the Test Box illuminate, confirming the integrity of the switches. The box also has a test button to check the lamps.The low level switch in column A may be checked by lowering the water level below the switch; this is achieved by closing the bottom colum

35、n isolating valve and opening the drain. A separate lamp will illuminate to check this switch. After the test, the level is reinstated by closing the drain valve, and opening the column-to-heater5/48IssueABCDEFGDate2012.03BLX 17AHP 006 GKS0 45GNGUANGDONG ELECTRIC POWER DESIGN INSTITUTESHEET 6.1isola

36、ting valves. The procedure may then be repeated in a similar manner for Column B.6.1.2.4 Level AlarmsIndividual computer alarms are initiated for each heater as described in sections6.1.2.1 and 6.1.2.3. This enables the operator to determine on which heater the fault or test occurs.6.1.3HP Heater Fe

37、ed water Isolation and Bypass (Pressure Equalizing) Valves AHP101-102-112VL (Bank A)AHP201-202-212VL (Bank B)These valves have electric motorised actuator switch controls as follows:- On the actuator：Selector switch for LOCAL-STOP-REMOTE：Selector switch for OPEN-NEUTRAL-CLOSENOTE: Equalizing valves

38、112/212VL are sequentially linked with operation of outlet valves.Normal operation where required Is REMOTE, i.e. from CCR. Heater Bank 'A' valves are interlocked with sequential operation as follows:(Bank B is similar)When outlet valve 102VL receives the KIC command to OPEN, equalizing valv

39、e 112VL opens fully, then 102VL opens fully, and then 112VL closes. Provided 102VL is fully open, inlet valve 101VL may be opened by KIC 101VL controller on the KIC. The three valves close automatically on HI 3 level in No. 6A or 7A heater.If either 101VL or 102VL are not fully open, then (i)Heater

40、bypass valve 009VL&119VL opens.(ii) Bled steam valves 101VV and 103VV will be prevented from opening.(iii) Close MSR BS and LS drains to heaters.On restoration of normal level in the affected heater, it is an operator's action to reopen the isolation valves 101-102VL. Similar actions occur o

41、n 'B' bank valves (200 series numbers).6.1.4 HP Heaters Feed water Bypass Isolation Valve AHP009VL&019VLThis valve has an electric motorised actuator with controls as follows:- On the actuator: Selector switch for LOCAL-STOP-REMOTE: Selector switch for OPEN-NEUTRAL-CLOSENormal operation

42、where required is REMOTE, i.e. from CCR. The valves open automatically on HI 3 level in any HP heater, and also if any F.W. isolation valve6/48IssueABCDEFGDate2012.03BLX 17AHP 006 GKS0 45GNGUANGDONG ELECTRIC POWER DESIGN INSTITUTESHEET 6.1AHP101-102-201-202VL is not fully open. In the latter case, i

43、f the bypass valve fails to open after a time delay (specified later) then a computer alarm "HP HTRS BYP. NOT OPEN" is initiated. To cater for the motorised bypass failing to open a spring loaded bypass valve AHP008VL is provided. It is an operator action to close the valve after restorati

44、on of normal heater levels, and after all F.W. isolation valves have been opened. The F.W. Isolation valves are normally left open, and the bypass valve is left closed, at all times - even when the unit is shut down.6.1.5 HP Heaters 6 & 7 Bled Steam Isolation Valves AHP 101-103-201-203VVThese va

45、lves have electric motorised actuators with controls as follows: On the actuator: Selector switch for LOCAL-STOP-REMOTE: Selector switch for OPEN-NEUTRAL-CLOSENormal operation where required is from the CCR. The valves are normally left open at all times, even during shutdown, unless the shutdown is

46、 for extended periods (e.g. for maintenance). They close automatically in the case of turbine trip, or HI 3 water level of either heater in an affected bank. Sections 6.1.2.1 and 6.1.2.2 give details of which valve operates. The valves are also prevented from opening if either F.W. isolating valve o

47、n the same bank is not fully open. It is an operator action to reopen the valves when the closing signal has been removed. Note that the valves should be reopened gradually after a heater trip using the KIC controller on the KIC, In order that the heaters are not subjected to undue thermal shock. Th

48、e operator can monitor the bled steam valve positions on the KIC.6.1.6 HP Heaters 6 & 7 Bled Steam Non-Return Valves GPV0651VV: High heater 6 bled steam N.R.V. GPV0751VV: High heater 7 bled steam N.R.V. Detailed refer to GPV system manual chapter 6All valves are also force-close on receipt of a

49、closing signal initiated by a TURBINE TRIP, or HI 3 LEVEL in any HP heater. The heater high level closing signal of GPV0651VV &0751VV are released when the down stream bled steam isolating valves of the disturbed heater bank have closed or the affected heater water level has returned to below le

50、vel 3 in response to the disturbance.6.1.7 HP Heaters Normal Level Control Valves AHP117-119-217-219VL HP Heaters High Level Control Valves AHP118-120-218-220VLThese valves are used to control water level in the HP heaters as described in section 6.1.1, Level is normally kept constant by the Normal

51、Level Control Valves, which will close on failure of air supplies. Drains from No. 7 heaters drain In No. 6 heaters via No. 6 drain receivers, and drains from No. 6 heaters drain to the deaerator. If the normal drains are inadequate, the level in the heaters will rise, and7/48IssueABCDEFGDate2012.03

52、BLX 17AHP 006 GKS0 45GNGUANGDONG ELECTRIC POWER DESIGN INSTITUTESHEET 6.1the High Level Control Valves will open to pass the excess drainage to the condenser. The high level valves are also fitted with a solenoid in the air pipe work, which will energize in response to a signal from a HI HI level sw

53、itch on the heaters, and open the valve fully (refer to 6.1.2.1 and 6.1.2.2 for details). The high level valves fail open on loss of air supplies. All control valves are fitted with hand wheels to enable manual operation in the event of air failure.Above 40% load, pressure in No. 6 heaters is Insuff

54、icient to push the drains up to the deaerator, and the high level valves operate to send the flow to the condenser. In the event of controller failure, it is possible to operate the valves with hand wheel. The table which follows gives a summary of the control valves, together with references of cor

55、responding transmitters and AUTO/MANUAL stations.HP HeaterNormal Level Control Valve 117VL-High Level Control Valve- 118VLLevel Transmi tterAuto- Manual Control Station 001KU002KUControl Level IndicatorOpening Solenoid FittedRemarks6A(601RE)6A(601RE)001MN002MN-No Yes-Opens fully on 6A/7A Hi Hi level

56、-Opens fully on 6B/7B Hi Hi level-Opens fully on 6A/7A Hi Hi level-Opens fully on 6B/7B Hi Hi level6B(602RE)6B(602RE)217VL- 218VL003MN004MN003KU004KU-No Yes7A(701RE)7A(701RE)119VL- 120VL005MN006MN005KU006KU-No Yes7B(702RE)7B(702RE)219VL- 220VL007MN008MN007KU008KU-No YesNotes:1) All device references are pref