CN104961271A - Quick starting method of condensate polishing system of nuclear power station - Google Patents
Quick starting method of condensate polishing system of nuclear power station Download PDFInfo
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- CN104961271A CN104961271A CN201510325485.6A CN201510325485A CN104961271A CN 104961271 A CN104961271 A CN 104961271A CN 201510325485 A CN201510325485 A CN 201510325485A CN 104961271 A CN104961271 A CN 104961271A
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Abstract
The invention discloses a quick starting method of a condensate polishing system of a nuclear power station, and belongs to the technical field of condensate polishing of the nuclear power station. The quick starting method of the condensate polishing system of the nuclear power station comprises the following steps of enabling the condensate polishing system to be in a first hot standby mode or a second hot standby mode; and transforming the condensate polishing system from the first hot standby mode or the second hot standby mode to a running mode when the quality of condensate is abnormal. By the quick starting method, the condensate polishing system can run within 2 minutes when the quality of the condensate is abnormal, the condensate can be purified, the quality of the condensate can be recovered rapidly, safe and reliable running of the nuclear power station is guaranteed, and economic loss is avoided.
Description
Technical field
The present invention relates to nuclear power station condensation water precision processing technical field, particularly a kind of nuclear power station condensation water precision processing system quick start method.
Background technology
Nuclear power station condensation water precision processing system is used for, when Nuclear power plants unit starting, hot reserve, safe shutdown, cold shut-down and Power operation period two loop condensed water water quality occur abnormal, removing the dissolved substance in condensed water and suspended impurity.When condensed water water quality is normal, condensed water precision processing system is in stoppage in transit pattern, and the condensed water from condensate system directly gets back to condensate system by condensate system by-pass line without condensed water precision processing system.When condensed water water quality occurs abnormal, such as, during Power operation, condenser leakage causes secondary coolant circuit system to occur, and water quality is abnormal, be operational mode by condensed water precision processing system by Mode change of stopping transport, now, condensed water enters condensed water precision processing system, and after purification, quality recovery is to normal Con trolling index scope.
As shown in Figure 1, the condensed water precision processing system of AP1000 series Nuclear power plants is in parallel with condensate system by-pass line 9, mainly comprises: the preposition cation bed 1 connected in turn, high flow rate mixed bed 4, post-filter 7 and condensed water topping-up pump 8; Wherein preposition cation bed 1, high flow rate mixed bed 4 and post-filter 7 are for purifying condensed water, and described condensed water topping-up pump 8 is for being exported the condensed water after purification by described condensed water precision processing system.Above-mentioned condensed water precision processing system also comprises the condensed water precision processing system by-pass line 10 in parallel with condensate system by-pass line 9, when safeguarding for condensed water precision processing system, condensed water is circulated, to check that in condensed water precision processing system, whether each equipment is normal in condensed water precision processing system inside.
Under stoppage in transit pattern, above-mentioned preposition cation bed 1, high flow rate mixed bed 4, post-filter 7 and condensed water topping-up pump 8 are all in shut down condition, and relevant valve is also all in closing condition.The operational mode of above-mentioned condensed water precision processing system as shown in Figure 2, in the operating mode, above-mentioned preposition cation bed 1, high flow rate mixed bed 4, post-filter 7 and condensed water topping-up pump 8 are all in running status, condensed water enters condensed water precision processing system from condensed water precision processing system inlet valve V01, after the purification of preposition cation bed 1, high flow rate mixed bed 4 and post-filter 7, export V17 output by condensed water precision processing system flowing water Valve after being boosted by condensed water topping-up pump 8 and get back to condensate system.In the operating mode, relevant valve is as condensed water precision processing system inlet valve V01, cation bed inlet valve V02, cation bed flowing water Valve V04, mixed bed inlet valve V07, mixed bed flowing water Valve V09, strainer inlet valve V12, strainer flowing water Valve V14, condensed water topping-up pump inlet valve V15, condensed water topping-up pump flowing water Valve V16 and condensed water precision processing system flowing water Valve V17 is in opened condition, and cation bed water inlet boosting valve V03, cation bed recirculation (egr) valve V05, cation bed bypass valve V06, mixed bed water inlet boosting valve V08, mixed bed recirculation (egr) valve V10, filter bypass valve V11, strainer water inlet boosting valve V13 and condensed water precision processing system bypass valve V18 is in closing condition.
During condensed water precision processing system is in stoppage in transit pattern, because the condensed water in the ion-exchange unit of preposition cation bed 1 and high flow rate mixed bed 4 remains static (being generally greater than one week) for a long time, the ion adsorbed in resin has precipitation, when causing preposition cation bed 1, high flow rate mixed bed 4 initial launch, effluent quality is defective, therefore need when putting into operation preposition cation bed, high flow rate mixed bed 4 by platform recirculation at condensed water precision processing system, after all devices effluent quality is all qualified, just can open system flowing water Valve, completion system puts into operation.In addition, the preposition cation bed 1 of every platform, high flow rate mixed bed 4 and post-filter 7 all need a boost process when putting into operation.Therefore, when condensed water water quality occurs abnormal, condensed water precision processing system changes by the pattern of stopping transport the time that operational mode needs 2.5 hours into completely.
Realizing in process of the present invention, the present inventor finds at least there is following problem in prior art: the starting method required time that existing condensed water precision processing system transfers operational mode to by the pattern of stoppage in transit is longer, when condensed water water quality is abnormal, condensed water precision processing system can not start fast and purifies condensed water.
Summary of the invention
In order to solve above-mentioned technical problem, the invention provides a kind of when condensed water water quality is abnormal, condensed water precision processing system can enter the condensed water precision processing system starting method of operational mode fast.
Specifically, following technical scheme is comprised:
A kind of nuclear power station condensation water precision processing system quick start method: said method comprising the steps of:
Step 1, described condensed water precision processing system is made to enter the first hot standby mode or the second hot standby mode;
Described first hot standby mode is: in described condensed water precision processing system, condensed water precision processing system inlet valve is in opened condition, condensed water precision processing system flowing water Valve is in closing condition, preposition cation bed, high flow rate mixed bed and post-filter are in running status, condensed water topping-up pump is in shut down condition, and condensed water remains static in described condensed water precision processing system;
Described second hot standby mode is: in described condensed water precision processing system, condensed water precision processing system inlet valve is in opened condition, condensed water precision processing system flowing water Valve is in closing condition, preposition cation bed, high flow rate mixed bed, post-filter and condensed water topping-up pump are in running status, condensed water precision processing system by-pass line is in connected state, and condensed water is circulated in described condensed water precision processing system by described condensed water precision processing system by-pass line;
Step 2, when described condensed water precision processing system is in the first hot standby mode, by starting described condensed water topping-up pump and opening condensed water precision processing system flowing water Valve, described condensed water precision processing system is made to enter operational mode;
When described condensed water precision processing system is in the second hot standby mode, by opening described condensed water precision processing system flowing water Valve and disconnecting condensed water precision processing system by-pass line, described condensed water precision processing system is made to transfer operational mode to;
Described operational mode is: in described condensed water precision processing system, described preposition cation bed, high flow rate mixed bed, post-filter and condensed water topping-up pump are in running status, and condensed water exports condensate system by-pass line to by described condensed water precision processing system flowing water Valve.
Further, also step is comprised before step 1: described condensed water precision processing system is entered operational mode by the pattern of stoppage in transit; Described stoppage in transit pattern is: in described condensed water precision processing system, and described preposition cation bed, high flow rate mixed bed, post-filter and condensed water topping-up pump are in shut down condition; Condensed water does not enter described condensed water precision processing system; In step 1, described condensed water precision processing system is made to enter the first hot standby mode or the second hot standby mode by operational mode.
Particularly, in step 1, described condensed water precision processing system is made to transfer the first hot standby mode to by operational mode by closedown condensed water precision processing system flowing water Valve and stoppage in transit condensed water topping-up pump.
Particularly, in step 1, described condensed water precision processing system is made to transfer the second hot standby mode to by operational mode by closing condensed water precision processing system flowing water Valve and opening condensed water precision processing system bypass valve.
Further, by the concrete steps that described condensed water precision processing system transfers operational mode to by the pattern of stoppage in transit be: open condensed water precision processing system inlet valve, make condensed water enter described condensed water precision processing system; Then open cation bed water inlet boosting valve, after the pressure difference of cation bed inlet valve both sides is qualified, closes cation bed water inlet boosting valve, open cation bed inlet valve and cation bed recirculation (egr) valve, cation bed recirculating pump is started; After the effluent quality of preposition cation bed is qualified, closes cation bed recirculation (egr) valve, open cation bed flowing water Valve, preposition cation bed is put into operation; Open mixed bed water inlet boosting valve, after the pressure difference of mixed bed inlet valve both sides is qualified, closes mixed bed water inlet boosting valve, open mixed bed inlet valve and mixed bed recirculation (egr) valve, mixed bed recirculating pump is started; After the effluent quality of high flow rate mixed bed is qualified, closes mixed bed recirculation (egr) valve, open mixed bed flowing water Valve, high flow rate mixed bed is put into operation; Opened filter water inlet boosting valve, after the pressure difference of strainer inlet valve both sides is qualified, close strainer water inlet boosting valve, opened filter inlet valve and strainer flowing water Valve, make post-filter put into operation; Open condensed water topping-up pump inlet valve and condensed water topping-up pump flowing water Valve, after condensed water topping-up pump is put into operation, open condensed water precision processing system flowing water Valve and described condensed water precision processing system is put into operation.
Further, in step 1, when described condensed water precision processing system is in described first hot standby mode, described condensed water precision processing system is made to transfer described second hot standby mode to by described first hot standby mode every Preset Time.
Particularly, described Preset Time is 1 ~ 7 day.
Further, in step 1, when in described condensed water precision processing system, when the quantity of condensed water topping-up pump is more than 2, when described condensed water precision processing system is in the second hot standby mode, wherein 1 condensed water topping-up pump is only made to be in running status; In step 2, be in the condensed water topping-up pump of shut down condition by starting residue and open described condensed water precision processing system flowing water Valve, making described condensed water precision processing system enter operational mode by described second hot standby mode.
The beneficial effect of the technical scheme that the embodiment of the present invention provides:
In the nuclear power station condensation water precision processing system quick start method that the embodiment of the present invention provides, when condensed water water quality is normal, condensed water precision processing system is in the first hot standby mode or the second hot standby mode, when condensed water water quality is abnormal, condensed water precision processing system directly enters operational mode from the first hot standby mode or the second hot standby mode, and condensed water precision processing system is put into operation.Because in the first hot standby mode or the second hot standby mode, preposition cation bed, high flow rate mixed bed, post-filter are all in operational mode, therefore from the first hot standby mode or the second hot standby mode required maximum duration that puts into operation be that condensed water topping-up pump (opening containing flowing water Valve) starts and opening time of condensed water precision processing system flowing water Valve; Therefore within the starting method of the embodiment of the present invention can make time that condensed water precision processing system puts into operation reach 2 minutes.When condensed water water quality occurs abnormal, condensed water precision processing system can put into operation fast, purifying treatment is carried out to condensed water, condensed water water quality is returned to rapidly in normal range, reduce the corrosion of vapour generator and the secondary circuit miscellaneous equipment caused because condensed water water quality is abnormal to greatest extent, reduce the probability of the unplanned shutdown that Nuclear power plants causes because water quality is abnormal, ensure nuclear plant safety reliability service, avoid financial loss.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is condensed water precision processing system stoppage in transit pattern diagram;
Fig. 2 is condensed water precision processing system operational mode schematic diagram;
The condensed water precision processing system first hot standby mode schematic diagram that Fig. 3 provides for the embodiment of the present invention;
The condensed water precision processing system second hot standby mode schematic diagram that Fig. 4 provides for the embodiment of the present invention;
In figure, Reference numeral represents respectively:
1, preposition cation bed; 2, cation bed resin catcher; 3, cation bed recirculating pump;
4, high flow rate mixed bed; 5, mixed-bed resin catcher; 6, mixed bed recirculating pump;
7, post-filter; 8, condensed water increases pump;
9, condensate system by-pass line;
10, condensed water precision processing system by-pass line;
11, from the condensed water of condensate system;
12, the condensed water of condensate system is transmitted back to;
V01, condensed water precision processing system inlet valve; V02, cation bed inlet valve;
V03, cation bed water inlet boosting valve; V04, cation bed flowing water Valve;
V05, cation bed recirculation (egr) valve; V06, cation bed bypass valve;
V07, mixed bed inlet valve; V08, mixed bed water inlet boosting valve;
V09, mixed bed flowing water Valve; V10, mixed bed recirculation (egr) valve;
V11, filter bypass valve; V12, strainer inlet valve;
V13, strainer water inlet boosting valve; V14, strainer flowing water Valve;
V15, condensed water topping-up pump inlet valve; V16, condensed water topping-up pump flowing water Valve;
V17, condensed water precision processing system flowing water Valve; V18, condensed water precision processing system bypass valve.
In figure, the direction of arrow represents condensed water flow direction;
In figure, solid black valve represents that this valve is in closing condition;
In figure, white hollow valve represents that this valve is in open mode.
Embodiment
For making technical scheme of the present invention and advantage clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
The embodiment of the present invention provides a kind of nuclear power station condensation water precision processing system quick start method, it is characterized in that, said method comprising the steps of:
Step 1, described condensed water precision processing system is made to enter the first hot standby mode or the second hot standby mode;
Described first hot standby mode is: in described condensed water precision processing system, condensed water precision processing system inlet valve V01 is in opened condition, condensed water precision processing system flowing water Valve V17 is in closing condition, preposition cation bed 1, high flow rate mixed bed 4 and post-filter 7 are in running status, condensed water topping-up pump 8 is in shut down condition, and condensed water remains static in described condensed water precision processing system;
Described second hot standby mode is: in described condensed water precision processing system, condensed water precision processing system inlet valve V01 is in opened condition, condensed water precision processing system flowing water Valve V17 is in closing condition, preposition cation bed 1, high flow rate mixed bed 4, post-filter 7 and condensed water topping-up pump 8 are in running status, condensed water precision processing system by-pass line 10 is in connected state, and condensed water is circulated in described condensed water precision processing system by described condensed water precision processing system by-pass line 10;
Step 2, when described condensed water precision processing system is in the first hot standby mode, by starting described condensed water topping-up pump 8 and opening condensed water precision processing system flowing water Valve V17, described condensed water precision processing system is made to enter operational mode;
When described condensed water precision processing system is in the second hot standby mode, by opening described condensed water precision processing system flowing water Valve V17 and disconnecting condensed water precision processing system by-pass line 10, described condensed water precision processing system is made to transfer operational mode to;
Described operational mode is: in described condensed water precision processing system, described preposition cation bed 1, high flow rate mixed bed 4, post-filter 7 and condensed water topping-up pump 8 are in running status, and condensed water exports condensate system by-pass line 9 to by described condensed water precision processing system flowing water Valve V17.
In the nuclear power station condensation water precision processing system quick start method that the embodiment of the present invention provides, when condensed water water quality is normal, described condensed water precision processing system is in the first hot standby mode or the second hot standby mode, when condensed water water quality occurs abnormal, condensed water precision processing system directly enters operational mode by the first hot standby mode or the second hot standby mode, purifying treatment is carried out to condensed water, makes condensed water water quality return to normal range rapidly.Wherein,
When described condensed water precision processing system is in the first hot standby mode, preposition cation bed 1, high flow rate mixed bed 4 and post-filter 7 are in running status, and condensed water topping-up pump 8 is in shut down condition.In condensed water precision processing system, the state of each valve is as shown in Figure 3 in such a mode, when preposition cation bed 1 is in running status, cation bed inlet valve V02, cation bed flowing water Valve V04 are in opened condition, and cation bed water inlet boosting valve V03, cation bed recirculation (egr) valve V05 and cation bed bypass valve V06 are in closing condition, and the pressure of preposition cation bed 1 and effluent quality conformance with standard; When high flow rate mixed bed 4 is in running status, mixed bed inlet valve V07, mixed bed flowing water Valve V09 are in opened condition, and mixed bed water inlet boosting valve V08, mixed bed recirculation (egr) valve V10 are in closing condition, and the pressure of high flow rate mixed bed 4 and effluent quality conformance with standard; When post-filter 7 is in running status, strainer inlet valve V12, strainer flowing water Valve V14 are in opened condition, strainer water inlet boosting valve V13 and filter bypass valve V11 is in closing condition, and the pressure conformance with standard of post-filter 7.In the first hot standby mode, although condensed water topping-up pump 8 is in shut down condition, condensed water topping-up pump inlet valve V15 is in opened condition.Due in the first hot standby mode, condensed water topping-up pump 8 is in shut down condition and condensed water precision processing system flowing water Valve V17 closes, therefore the condensed water entering described condensed water precision processing system remains static at condensed water precision processing system, namely remains static in preposition cation bed 1, high flow rate mixed bed 4 and post-filter 7.Now, the condensed water 11 from condensate system directly gets back to condensate system by condensate system by-pass line 9.When the condensed water water quality of condensate system occurs abnormal, then open condensed water topping-up pump flowing water Valve V16, start condensed water topping-up pump 8, then condensed water precision processing system flowing water Valve V17 is opened, condensed water precision processing system is made to enter operational mode, now, condensed water 11 from condensate system enters condensed water precision processing system, purify through preposition cation bed 1, high flow rate mixed bed 4 and post-filter 5, the condensed water after purification gets back to condensate system after being exported by condensed water precision processing system flowing water Valve V17.
When described condensed water precision processing system is in the second hot standby mode, preposition cation bed 1, high flow rate mixed bed 4 post-filter 7 and condensed water topping-up pump 8 are all in running status.In such a mode in condensed water precision processing system the state of each valve as shown in Figure 4, condensed water precision processing system inlet valve V01, cation bed inlet valve V02, cation bed flowing water Valve V04, mixed bed inlet valve V07, mixed bed flowing water Valve V09, strainer inlet valve V12, strainer flowing water Valve V14, condensed water topping-up pump inlet valve V15, condensed water topping-up pump flowing water Valve V16 and condensed water precision processing system bypass valve V18 are in opened condition; Cation bed water inlet boosting valve V03, cation bed recirculation (egr) valve V05, cation bed bypass valve V06, mixed bed water inlet boosting valve V08, mixed bed recirculation (egr) valve V10, filter bypass valve V11, strainer water inlet boosting valve V13 and condensed water precision processing system flowing water Valve V17 are in closing condition.In the second hot standby mode, condensed water is circulated in described condensed water precision processing system by condensed water precision processing system by-pass line 10.Now, the condensed water 11 from condensate system directly gets back to condensate system by condensate system by-pass line 9.When the condensed water water quality of condensate system occurs abnormal, then open condensed water precision processing system flowing water Valve V17 and close condensed water precision processing system bypass valve 18, condensed water precision processing system is made to enter operational mode, now, condensed water 11 from condensate system enters condensed water precision processing system, purify through preposition cation bed 1, high flow rate mixed bed 4 and post-filter 5, the condensed water after purification gets back to condensate system after being exported by condensed water precision processing system flowing water Valve V17.
Can be found out by foregoing, condensed water precision processing system is opening time of condensed water topping-up pump flowing water Valve V16 and condensed water precision processing system flowing water Valve V17 from the first hot standby mode required time that puts into operation, it is opening time of condensed water precision processing system flowing water Valve V17 from the second hot standby mode required time that puts into operation, within therefore the starting method of the embodiment of the present invention can make time that condensed water precision processing system puts into operation reach 2 minutes.When condensed water water quality occurs abnormal, condensed water precision processing system can put into operation fast, reduce the corrosion of vapour generator and the secondary circuit miscellaneous equipment caused because condensed water water quality is abnormal to greatest extent, reduce the probability of the unplanned shutdown that Nuclear power plants causes because water quality is abnormal, ensure nuclear plant safety reliability service, avoid financial loss.
According to EPRI directive/guide, when nuclear power station secondary loop condensed water water quality is abnormal, if water quality exceedes action rank 2, Nuclear power plants unit need reduce power immediately to power plant's prescribed level (being typically about 30%); Water quality exceedes action rank 3, should perform <5% Power operation, and needs the degree of the corrosion caused according to impurity to provide to maintain vapour generator to run under thermal condition or enter coldly to close down judgement.Therefore, when secondary circuit condensed water water quality occurs abnormal, condensed water precision processing system puts into operation fast, water-quality guideline can be made to go up rapidly, avoid unit downrating, even can avoid the abnormal shutdown of unit.
From downrating aspect, the time that existing condensed water precision processing system puts into operation is about 2.5 hours, and in these 2.5 hours, Nuclear power plants unit must downrating.And the time that the quick start method that the embodiment of the present invention provides can make condensed water precision processing system put into operation is within 2 minutes, unit needs downrating hardly, to reduce the power of 30%, unit can be avoided to fall, and economic benefit that power brings for 2.5 hours is: 1250MWe × 70% × 1000KW/MWe × 0.289 yuan/KWh (station-service electricity price) × 2.5h/10000=63.2 ten thousand yuan.If secondary circuit condensed water water quality exceedes action rank 3, putting into operation fast of condensed water precision processing system may avoid a unplanned shutdown of unit, and now economic benefit will reach up to ten million unit.
In above-mentioned quick start method, after condensed water quality recovery is normal, then close condensed water precision processing system flowing water Valve V17 and condensed water topping-up pump flowing water Valve V16, condensed water topping-up pump 8 is made to be in shut down condition, condensed water precision processing system is made to transfer the first hot standby mode to by operational mode, or close condensed water precision processing system flowing water Valve V17, open condensed water precision processing system bypass valve V18 and make condensed water precision processing system transfer the second hot standby mode to by operational mode.
In above-mentioned quick start method, at the Nuclear power plants unit starting initial stage, condensed water precision processing system is in stoppage in transit pattern, and namely preposition cation bed 1, high flow rate mixed bed 4, post-filter 7 and condensed water topping-up pump 8 are in shut down condition, and condensed water does not enter described condensed water precision processing system.Before carry out step 1, need first to transfer condensed water precision processing system to operational mode by the pattern of stoppage in transit, after condensed water water quality that is stable until condensed water precision processing system, that export is qualified, again by closing condensed water precision processing system flowing water Valve V17 and condensed water topping-up pump flowing water Valve V16, condensed water topping-up pump 8 is stopped transport, makes described condensed water precision processing system transfer the first hot standby mode to by operational mode; Or make described condensed water precision processing system transfer the second hot standby mode to by operational mode by closing condensed water precision processing system flowing water Valve V17 and opening condensed water precision processing system bypass valve V18.Wherein, by the concrete steps that described condensed water precision processing system transfers operational mode to by the pattern of stoppage in transit be:
First put into operation preposition cation bed 1: open condensed water precision processing system inlet valve V01, makes condensed water enter described condensed water precision processing system; Then open cation bed water inlet boosting valve V03, after the pressure difference of cation bed inlet valve V02 both sides is qualified, closes cation bed water inlet boosting valve V03, open cation bed inlet valve V02 and cation bed recirculation (egr) valve V05, cation bed recirculating pump 3 is started; After the effluent quality of preposition cation bed 1 is qualified, closes cation bed recirculation (egr) valve V05, open cation bed flowing water Valve V04, preposition cation bed 1 is put into operation; If the quantity of preposition cation bed 1 is more than 2 in condensed water precision processing system, then every preposition cation bed 1 of platform transfers running status according to above-mentioned steps to by shut down condition successively.
After preposition cation bed 1 puts into operation, put into operation high flow rate mixed bed 4: open mixed bed water inlet boosting valve V08, after the pressure difference of mixed bed inlet valve V07 both sides is qualified, close mixed bed water inlet boosting valve V08, open mixed bed inlet valve V07 and mixed bed recirculation (egr) valve V10, mixed bed recirculating pump 6 is started; After the effluent quality of high flow rate mixed bed 4 is qualified, closes mixed bed recirculation (egr) valve V10, open mixed bed flowing water Valve V09, high flow rate mixed bed 4 is put into operation; Similarly, if the quantity of condensed water precision processing system high speed mixed bed 4 is more than 2, then every platform high flow rate mixed bed 4 transfers running status according to above-mentioned steps to by shut down condition successively.
Then put into operation post-filter 7: opened filter water inlet boosting valve V13, after the pressure difference of strainer inlet valve V12 both sides is qualified, close strainer water inlet boosting valve V08, opened filter inlet valve V12 and strainer flowing water Valve V14, makes post-filter 7 put into operation; Similarly, if the quantity of post-filter 7 is more than 2 in condensed water precision processing system, then every platform post-filter 7 transfers running status according to above-mentioned steps to by shut down condition successively.
Finally, open condensed water topping-up pump inlet valve V15 and condensed water topping-up pump flowing water Valve V16, after condensed water topping-up pump 8 is put into operation, open condensed water precision processing system flowing water Valve V17 and described condensed water precision processing system is put into operation.
In above-mentioned quick start method, if condensed water precision processing system is in the first hot standby mode for a long time, because the condensed water in condensed water precision processing system remains static for a long time, in preposition cation bed 1, high flow rate mixed bed 4 and corresponding cation bed resin catcher 2, mixed-bed resin catcher 3, the ion of resin absorption can be separated out, after transferring operational mode to by the first hot standby mode, be then difficult to purify the condensed water of water quality exception.Compared with the first hot standby mode, second hot standby mode is more preferably hot standby mode, but, because energy consumption when condensed water topping-up pump 8 runs is higher, increase working cost, if therefore condensed water precision processing system is in the second hot standby mode for a long time, the energy consumption of Nuclear power plants unit can be increased.Therefore, described condensed water precision processing system can be made to transfer described second hot standby mode to by described first hot standby mode every Preset Time, the condensed water in condensed water precision processing system is made to carry out an internal recycle, so both can reduce energy consumption, the effluent quality of preposition cation bed 1 and high flow rate mixed bed 2 can be made again to remain qualified.According to the experience of actual motion, transfer described second hot standby mode every condensed water precision processing system described in 1 ~ 7 angel to by described first hot standby mode, the time that condensed water precision processing system is in the second hot standby mode is can meet the demands for 10 ~ 15 minutes.The process being transferred to the second hot standby mode by the first hot standby mode is: open condensed water topping-up pump flowing water Valve V16 and condensed water precision processing system bypass valve V18.After condensed water carries out an internal recycle, close condensed water topping-up pump flowing water Valve V16 and condensed water precision processing system bypass valve V18, make condensed water precision processing system get back to the first hot standby mode.
In above-mentioned quick start method, due in the second hot standby mode, the effect of condensed water topping-up pump 8 maintains the internal recycle of condensed water in condensed water precision processing system, therefore when the quantity of condensed water topping-up pump 8 is more than 2, when the second hot standby mode, do not need all condensed water topping-up pumps 8 to be all in running status, only need a part of condensed water topping-up pump 8 to be in running status, such as, a condensed water topping-up pump 8 can be only had to be in running status.The internal recycle of condensed water in condensed water precision processing system can either be maintained like this, energy consumption, save energy can be reduced again.When transferring operational mode to by the second hot standby mode accordingly, be in the condensed water topping-up pump 8 of shut down condition by starting residue and open condensed water precision processing system flowing water Valve V17, making described condensed water precision processing system enter operational mode.
2 are (wherein below for the quantity of preposition cation bed 1, high flow rate mixed bed 2, post-filter 7 and condensed water topping-up pump 8,2 condensed water topping-up pumps 8 all put into operation when condensed water precision processing system is in operational mode, do not comprise stand-by pump), the condensed water precision processing system quick start method that the embodiment of the present invention provides is described further.
See Fig. 1 ~ 4, when the quantity of preposition cation bed 1, high flow rate mixed bed 2, post-filter 7 and condensed water topping-up pump 8 is 2, the quick start method of condensed water precision processing system comprises the following steps:
Step (a), during Nuclear power plants unit starting, open condensed water precision processing system inlet valve V01, preposition cation bed 1, high flow rate mixed bed 4, post-filter 7 and condensed water topping-up pump 8 is made to put into operation successively, then open condensed water precision processing system flowing water Valve V17, make condensed water precision processing system transfer operational mode to by the pattern of stoppage in transit;
Step (b), after unit condensed water water quality is qualified, closes condensed water precision processing system inlet valve V17 and all condensed water topping-up pump flowing water Valve V16, makes condensed water precision processing system transfer the first hot standby mode to by operational mode; Every 7 days, start a condensed water topping-up pump 8 and chain unlatching condensed water topping-up pump flowing water Valve V16, open condensed water precision processing system bypass valve V18, make condensed water precision processing system transfer the second hot standby mode to by the first hot standby mode, utilize condensed water precision processing system by-pass line 10 to make the condensed water in condensed water precision processing system carry out internal recycle.After completing once circulation, close condensed water topping-up pump and chain closedown condensed water topping-up pump flowing water Valve V16, close condensed water precision processing system bypass valve V18, make condensed water precision processing system get back to the first hot standby mode by the second hot standby mode;
Step (c), when nuclear power station secondary loop condensed water water quality is abnormal, start all condensed water topping-up pumps and chain unlatching condensed water topping-up pump flowing water Valve V16, then open condensed water precision processing system flowing water Valve V17, make condensed water precision processing system enter operational mode.From the condensed water 11 of condensate system after the purification of preposition cation bed 1, high flow rate mixed bed 4 and post-filter 7, be transmitted back to condensate system;
Step (d), when nuclear power station secondary loop condensed water water quality is recovered normally through purification, close condensed water precision processing system flowing water Valve V17, stop transport all condensed water topping-up pumps 8 chain closedown condensed water topping-up pump flowing water Valve V16, makes condensed water precision processing system get back to the first hot standby mode.
When nuclear power station secondary loop condensed water water quality occurs abnormal again.Repeating step (c) ~ (d).
To sum up, embodiments provide a kind of nuclear power station condensation water precision processing system quick start method, when condensed water water quality is normal, condensed water precision processing system is in the first hot standby mode or the second hot standby mode, when condensed water water quality is abnormal, condensed water precision processing system directly enters operational mode from the first hot standby mode or the second hot standby mode, condensed water precision processing system was put into operation within 2 minutes, purifying treatment is carried out to condensed water, condensed water water quality is made to recover rapidly normal, reduce the corrosion of vapour generator and the secondary circuit miscellaneous equipment caused because condensed water water quality is abnormal to greatest extent, reduce the probability of the unplanned shutdown that Nuclear power plants causes because water quality is abnormal, ensure nuclear plant safety reliability service, avoid financial loss.
The above is only understand technical scheme of the present invention for the ease of those skilled in the art, not in order to limit the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a nuclear power station condensation water precision processing system quick start method, is characterized in that, said method comprising the steps of:
Step 1, described condensed water precision processing system is made to enter the first hot standby mode or the second hot standby mode;
Described first hot standby mode is: in described condensed water precision processing system, condensed water precision processing system inlet valve (V01) is in opened condition, condensed water precision processing system flowing water Valve (V17) is in closing condition, preposition cation bed (1), high flow rate mixed bed (4) and post-filter (7) are in running status, condensed water topping-up pump (8) is in shut down condition, and condensed water remains static in described condensed water precision processing system;
Described second hot standby mode is: in described condensed water precision processing system, condensed water precision processing system inlet valve (V01) is in opened condition, condensed water precision processing system flowing water Valve (V17) is in closing condition, preposition cation bed (1), high flow rate mixed bed (4), post-filter (7) and condensed water topping-up pump (8) are in running status, condensed water precision processing system by-pass line (10) is in connected state, condensed water is circulated in described condensed water precision processing system by described condensed water precision processing system by-pass line (10),
Step 2, when described condensed water precision processing system is in the first hot standby mode, by starting described condensed water topping-up pump (8) and opening condensed water precision processing system flowing water Valve (V17), described condensed water precision processing system is made to enter operational mode;
When described condensed water precision processing system is in the second hot standby mode, by opening described condensed water precision processing system flowing water Valve (V17) and disconnecting condensed water precision processing system by-pass line (10), described condensed water precision processing system is made to transfer operational mode to;
Described operational mode is: in described condensed water precision processing system, described preposition cation bed (1), high flow rate mixed bed (4), post-filter (7) and condensed water topping-up pump (8) are in running status, and condensed water exports condensate system by-pass line (9) to by described condensed water precision processing system flowing water Valve (V17).
2. quick start method according to claim 1, is characterized in that, also comprises step before step 1:
Described condensed water precision processing system is entered operational mode by the pattern of stoppage in transit;
Described stoppage in transit pattern is: in described condensed water precision processing system, and described preposition cation bed (1), high flow rate mixed bed (4), post-filter (7) and condensed water topping-up pump (8) are in shut down condition; Condensed water does not enter described condensed water precision processing system;
In step 1, described condensed water precision processing system is made to enter the first hot standby mode or the second hot standby mode by operational mode.
3. quick start method according to claim 2, is characterized in that,
In step 1, described condensed water precision processing system is made to transfer the first hot standby mode to by operational mode by closedown condensed water precision processing system flowing water Valve (V17) and stoppage in transit condensed water topping-up pump (8).
4. quick start method according to claim 2, is characterized in that,
In step 1, described condensed water precision processing system is made to transfer the second hot standby mode to by operational mode by closing condensed water precision processing system flowing water Valve (V17) and opening condensed water precision processing system bypass valve (V18).
5. quick start method according to claim 2, is characterized in that, by the concrete steps that described condensed water precision processing system transfers operational mode to by the pattern of stoppage in transit is:
Open condensed water precision processing system inlet valve (V01), make condensed water enter described condensed water precision processing system; Then cation bed water inlet boosting valve (V03) is opened, after the pressure difference of cation bed inlet valve (V02) both sides is qualified, close cation bed water inlet boosting valve (V03), open cation bed inlet valve (V02) and cation bed recirculation (egr) valve (V05), cation bed recirculating pump (3) is started; After the effluent quality of preposition cation bed (1) is qualified, closes cation bed recirculation (egr) valve (V05), open cation bed flowing water Valve (V04), preposition cation bed (1) is put into operation;
Open mixed bed water inlet boosting valve (V08), after the pressure difference of mixed bed inlet valve (V07) both sides is qualified, close mixed bed water inlet boosting valve (V08), open mixed bed inlet valve (V07) and mixed bed recirculation (egr) valve (V10), mixed bed recirculating pump (6) is started; After the effluent quality of high flow rate mixed bed (4) is qualified, closes mixed bed recirculation (egr) valve (V10), open mixed bed flowing water Valve (V09), high flow rate mixed bed (4) is put into operation;
Opened filter water inlet boosting valve (V13), after the pressure difference of strainer inlet valve (V12) both sides is qualified, close strainer water inlet boosting valve (V08), opened filter inlet valve (V12) and strainer flowing water Valve (V14), make post-filter (7) put into operation;
Open condensed water topping-up pump inlet valve (V15) and condensed water topping-up pump flowing water Valve (V16), after condensed water topping-up pump (8) is put into operation, open condensed water precision processing system flowing water Valve (V17) and described condensed water precision processing system is put into operation.
6. quick start method according to claim 1, it is characterized in that, in step 1, when described condensed water precision processing system is in described first hot standby mode, described condensed water precision processing system is made to transfer described second hot standby mode to by described first hot standby mode every Preset Time.
7. quick start method according to claim 6, is characterized in that, described Preset Time is 1 ~ 7 day.
8. quick start method according to claim 1, it is characterized in that, in step 1, when in described condensed water precision processing system, when the quantity of condensed water topping-up pump (8) is more than 2, when described condensed water precision processing system is in the second hot standby mode, wherein 1 condensed water topping-up pump (8) is only made to be in running status;
In step 2, be in the condensed water topping-up pump (8) of shut down condition by starting residue and open described condensed water precision processing system flowing water Valve (V17), making described condensed water precision processing system enter operational mode by described second hot standby mode.
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| CN106830186A (en) * | 2017-02-13 | 2017-06-13 | 江苏核电有限公司 | A kind of technique of condensed water precision processing system operation |
| CN111732219A (en) * | 2020-03-31 | 2020-10-02 | 江苏核电有限公司 | Control method for bypass multi-mode operation of condensate polishing system |
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