CN202542958U - Fully-automatic boiler water supplying and oxygen feeding device - Google Patents
Fully-automatic boiler water supplying and oxygen feeding device Download PDFInfo
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- CN202542958U CN202542958U CN2012201437290U CN201220143729U CN202542958U CN 202542958 U CN202542958 U CN 202542958U CN 2012201437290 U CN2012201437290 U CN 2012201437290U CN 201220143729 U CN201220143729 U CN 201220143729U CN 202542958 U CN202542958 U CN 202542958U
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 148
- 239000001301 oxygen Substances 0.000 title claims abstract description 148
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 148
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 87
- 239000001257 hydrogen Substances 0.000 claims abstract description 41
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 41
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 40
- 238000001514 detection method Methods 0.000 claims abstract description 32
- 238000006213 oxygenation reaction Methods 0.000 claims description 74
- 230000005611 electricity Effects 0.000 claims description 24
- 238000012360 testing method Methods 0.000 claims description 8
- 230000007797 corrosion Effects 0.000 abstract description 9
- 238000005260 corrosion Methods 0.000 abstract description 9
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- 230000033116 oxidation-reduction process Effects 0.000 abstract 1
- 239000007787 solid Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 23
- 230000008569 process Effects 0.000 description 10
- 238000012545 processing Methods 0.000 description 9
- 230000001112 coagulating effect Effects 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 238000005273 aeration Methods 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 4
- 230000008676 import Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 230000033228 biological regulation Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000002209 hydrophobic effect Effects 0.000 description 3
- 230000006641 stabilisation Effects 0.000 description 3
- 238000011105 stabilization Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
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- 238000000151 deposition Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
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- 238000011897 real-time detection Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241000220317 Rosa Species 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000004176 ammonification Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
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- 150000002431 hydrogen Chemical class 0.000 description 1
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Abstract
The utility model discloses a fully-automatic boiler water supplying and oxygen feeding device which comprises a PLC (programmable logic controller), a flow detection device, a dissolved oxygen detection device, an oxidation-reduction potential detection device, a hydrogen conductivity detection device and a flow controller. A treatment mode of water-supplying combined with oxygen-feeding is adopted, and by means of the full intelligent control oxygen feeding technology, supplied water flow is taken as a front feed to assist proportional-integral-differential control to subject supplied water to microscale oxygen feeding, and structure and form of an oxidation film of a water vapour contact interface are changed to enable the oxidation film to be more solid and compact to reduce even eradicate FAC (flow acceleration corrosion) of a water supply system, so that the problem of the flow acceleration corrosion of the water supply system is solved, the service life of equipment is prolonged, energy is saved, consumption is reduced, and economic and social benefits are improved.
Description
Technical field
The utility model belongs to electric power and power engineering control techniques field, specifically relates to a kind of full-automatic boiler feed water oxygenation device.
Background technology
The structure of existing oiler feed and draining system is as shown in Figure 1; A steam part of coming out from turbine branches to reuse after heating the final reheater; All the other gas-liquid mixtures that come out from turbine are through the condenser condensation, and condensed water, hydrophobic and extraneous supplementary feed mix bed through coagulating pumping toward coagulating then, mix the recirculated water entering low pressure feed water system of bed after softening and carry out preliminary low-temperature heat through coagulating; Handle through deoxygenator then; Part of oxygen and steam are discharged, and the recirculated water that deoxygenator comes out gets into steam separator again after high pressure heater, economizer and water screen system heating, and the steam of being discharged by steam separator gets into turbine after low temperature superheater, pendant superheater and finishing superheater bakingout process; Become mechanical work to the thermal power transfer of carrying in the steam by turbine, export electric energy at last.
Be the corrosion that reduces to feed water to circulating line; The at present employing carried out the oxygenation processing to feedwater more; Oxygenation is handled the whole conversions that are intended to realize the water feeding system sull, finally reaches corrosion and the scaling rate that reduces boi1er tube, the purposes such as the cycle of operation of slowing down the mixed bed of rising, prolonged boiler matting cycle and condensed water precision processing of direct current stove operation pressure reduction.At present the oiler feed processing mode mainly contains three kinds: reductibility volatilize full processing mode (AVT (R)), oxidisability volatilize full processing (AVT (O)) mode and feed water oxygenation Combined Processing (OT) mode.The critical unit feedwater of thermal power plant's large vol ultra (surpassing) is general adopts full volatilization to handle the operation of (AVT (R) and AVT (O)) operating mode; Long-time running causes that heating surface material surface sull form is loose; Cause water feeding system current accelerated corrosion (FAC) serious; The whole Fe content of water-steam system is high, finally produces following problem: the steam degree of cleaning are relatively poor, ports valve stops up, the fouling position in advance, high, the high pressure heater of furnace tube deposition speed and boiler pressure reduction is big and lift velocity fast, the boiler matting cycle is short, the dirty deposition at steam turbine high-pressure cylinder of red stone is big.Generally move with the ultra supercritical unit along with overcritical; The application of oiler feed oxygenation technology water treatment in stove will be more and more widely; Therefore feed water oxygenation is handled and also proposed new requirement, need improve existing oiler feed circulation oxygenation treatment process.In recent years, on traditional oiler feed oxygenation basis, the oiler feed oxygenation treatment process of the essential safety that some are new was continually developed:
Publication number is that (the open date: patent documentation 2010.11.10) discloses a kind of one through boiler feed water oxygenation treatment process of essential safety to CN101880092A; May further comprise the steps: (1) fired power generating unit does not have before the copper system oxygenation feedwater processing mode for only adding ammonia treatment, and ammonification is with the stokehold pH that feeds water
25 ℃Value is adjusted in 9.3-9.6; (2) after satisfying certain condition, with the deoxygenator exhaust valve closing; (3) add the oxygen point oxygenation in unit condensed water precision processing outlet; (4) control economizer inlet dissolved oxygen content in 5-50 μ g/L scope and the main steam oxygen level do not have significantly before than oxygenation and increase; (5) treat that stokehold feedwater cation electrodeposition conductance (CC) reduces to below the 0.15 μ S/cm, with the stokehold pH that feeds water
25 ℃Span of control is reduced to 8.8-9.3; (6) before the unit outage with the stokehold pH that feeds water
25 ℃Value is brought up to 9.3-9.6, until shutdown; (7) furnace stopping maintenance.Above-mentioned treatment process strengthens feed water oxygenation and handles surge capability, and parameter fluctuations such as feedwater dissolved oxygen content reduce.But this method adopts manual oxygenation, and when unit load changes when violent, often manual regulation adds oxygen flow and satisfied not demand, can't guarantee to add the stable of oxygen flow.
For solving the technical problem that the manual regulation oxygenation brings; (Granted publication day: patent documentation 2010.1.6) discloses a kind of hyperchannel and has made up power plant's automatic aeration device that feeds water side by side for CN201376921Y for Granted publication number; Comprise PLC (Programmable Logic Controller; Programmable logic controller), PLC input termination feedwater flow signal end and economizer import dissolved oxygen concentration signal end, said aeration device also comprises several unit channels; Each unit channel is made up of SV and throttle part, and SV meets PLC; Several unit channels are for being connected in parallel.Above-mentioned aeration device is compared with existing aeration device, owing to adopted robotization control, has improved the immunity from interference of device, and easy to adjust, and oxygen export target value control stabilization is accurate.But; Because said apparatus is only controlled adding oxygen flow according to feedwater flow signal and two signals of economizer import dissolved oxygen concentration signal, intelligence sample point is few, can't carry out Comprehensive Control to total system; And exist control untimely, the oxygenation instability of flow.
Therefore; Have and enough add oxygen flow in order to ensure to water system; Both promoted the feedwater redox potential; Be unlikely to have polyoxy to get into steam system again, explore the oiler feed oxygenation method and the device of a kind of novel automatic safety economy of utility model, will have far-reaching economic benefit and social benefit.
The utility model content
The utility model provides a kind of full-automatic boiler feed water oxygenation device; This device can be realized the full automatic control of oxygenation, and sampling point is arranged comprehensive and reasonable, and the oxygenation regulating is sensitive, control is convenient; Dissolved oxygen and redox potential target value control stabilization; And be provided with warning and defence program, need not manual intervention, safety economy.
A kind of full-automatic boiler feed water oxygenation device comprises:
PLC；
Flow detector is gathered feedwater flow and the feedwater flow signal is transferred to PLC;
The dissolved oxygen amount proofing unit, the dissolved oxygen amount of acquisition testing point also is transferred to PLC with the dissolved oxygen amount signal;
The redox potential proofing unit, the redox potential of acquisition testing point also is transferred to PLC with the redox potential signal;
The hydrogen conductive detection device, the hydrogen electricity of acquisition testing point is led and the hydrogen conductance signal is transferred to PLC;
Flow director links to each other with source of oxygen and according to the oxygen flow that adds of PLC instruction control feedwater.
The redox potential signal of the water flow signal of PLC reception flow detector, the dissolved oxygen amount signal of dissolved oxygen amount proofing unit, redox potential proofing unit and the hydrogen conductance signal of hydrogen conductive detection device are also analyzed; Send steering order to flow director simultaneously, realize control the feed water oxygenation flow by flow director.Through can understanding the content of oxygen in the feedwater, and then need can to confirm the flow of the oxygen that adds to the detection of dissolved oxygen amount; Through real-time monitoring to redox potential, can understand the formation state of Fe ionic concn in the water and sull, can control in real time the Fe ionic concn; Can understand the severity of pipeline internal corrosion through the real-time monitoring that the hydrogen electricity is led, oxygen-adding amount is controlled.
A kind of optimized technical scheme is: described flow director is a mass flow controller, and the flow signal output terminal of mass flow controller links to each other with the PLC input terminus.Adopt mass flow controller can detect the flow value of test point also and detection information can be transferred to PLC, can control adding oxygen flow based on the feedback command of PLC simultaneously, improved the stability of oxygenation flow-control.
Another kind of optimized technical scheme is: the pipeline between described source of oxygen and the mass flow controller is provided with electro connecting pressure gauge, and the signal output part of electro connecting pressure gauge links to each other with the PLC input terminus.Setting pressure scope in electro connecting pressure gauge (specifically deciding) based on system equipment; When feed water oxygenation device loine pressure is excessive or too small; System sends audio alarm; In time adjustment pressure meets oxygenation control requirement: when pressure was excessive, in control system adjustment pressure required to control, the assurance oxygenation carried out smoothly; When pressure was too small, control system adjustment pressure was to controlling requirement, and pressure is thrown over and hour can be considered artificial replacing oxygen bottle through the adjustment back, and the assurance oxygenation carries out smoothly.
Be the basis with above-mentioned two kinds of technology respectively; Form two kinds of further preferred schemes; Wherein said mass flow controller is provided with two parallelly connected pipelines with the pipeline that adds between the oxygen point of feedwater; Wherein be in series with first flow meter and first variable valve of controlling the first flow meter, second variable valve that is in series with second under meter on another pipeline and controls second under meter on a pipeline.Described first flow is counted big oxygen flow meter, and first variable valve is big regulating valve; Described second flow is counted little oxygen flow meter, and second variable valve is a control valve for small flows.Big or small oxygen flow meter is set, has made things convenient for the reading and the control of field worker, remedied the deficiency of mass flow controller Long-distance Control.
Device for ease of realizing the utility model can carry out Comprehensive Control to water quality and dissolved oxygen amount according to different acquisition point; A plurality of detection heads can be set; A kind of optimized technical scheme is: described dissolved oxygen amount proofing unit comprises the plurality of detection head, and the plurality of detection head is located at respectively on the pipeline of economizer inlet, economizer exit, steam separator outlet and finishing superheater outlet; Described hydrogen conductive detection device comprises the plurality of detection head, and the plurality of detection head is located at respectively on the pipeline of deoxygenator inlet, deoxygenator outlet and economizer inlet; The detection head of described redox potential proofing unit is located on the pipeline of economizer exit.For example, when needs are confirmed the feed water oxygenation flow, need to detect the dissolved oxygen amount of feedwater flow and the feedwater of economizer inlet; For avoiding too much dissolved oxygen to get in the finishing superheater; When preventing that device systems caused negative impact; Then need carry out oxygenation and regulate protection control automatically; At this moment, need to detect the dissolved oxygen amount of economizer exit feedwater, the dissolved oxygen amount of steam separator outlet feedwater and the dissolved oxygen amount of finishing superheater outlet steam; Under feedwater water quality deterioration situation (hydrogen electricity dodar is to the upper limit); For preventing that oxygenation from causing damage to system; Then need carry out oxygenation and regulate controlling alarm automatically, at this moment, the hydrogen electricity that need to detect the feedwater of deoxygenator inlet is led, the hydrogen electricity of deoxygenator outlet feedwater is led and the hydrogen electricity of economizer inlet feedwater is led.
Described PLC has warning device.The setting of warning device; Make when water quality deterioration, too much dissolved oxygen entering finishing superheater or line pressure are excessive or too small in the feedwater; PLC can remind the field personnel to check in the self-adjusting while, has improved security of pipeline round-robin and stability greatly.
The utility model also provides a kind of full-automatic boiler feed water oxygenation method, and this method is regulated control accurately, can change timely and effective adjustment oxygen-adding amount according to unit load, steadily control feedwater dissolved oxygen amount and redox potential; Be aided with simultaneously and report to the police and guarded command, guarantee the operation of unit safety economy under the OT operating mode.
A kind of full-automatic boiler feed water oxygenation method is characterized in that, comprising:
(1) preestablishes the dissolved oxygen amount target value that the economizer inlet feeds water;
Set the higher limit ORP of the redox potential of economizer exit feedwater
1
Set the lower value ORP of the redox potential of economizer exit feedwater
2
Detect the redox potential ORP of economizer exit feedwater then, and the dissolved oxygen amount target value that preestablishes the feedwater of economizer inlet adjusted as follows:
(i) work as ORP
2＜ORP＜ORP
1The time, get into step (2) according to the dissolved oxygen amount target value that preestablishes the feedwater of economizer inlet;
(ii) as ORP>=ORP
1The time, reduce the dissolved oxygen amount target value that the economizer inlet feeds water, until ORP
2＜ORP＜ORP
1, get back to step (i);
(iii) as ORP≤ORP
2The time, increase the dissolved oxygen amount target value of economizer inlet feedwater, until ORP
2＜ORP＜ORP
1, get back to step (i);
(2) detect feedwater flow, the dissolved oxygen amount target value of the predetermined economizer inlet feedwater that finally obtains according to feedwater flow and step (1) calculates the oxygen flow that adds of feedwater;
The relation that adds between oxygen flow and the feedwater flow of described feedwater is:
FLOW
O2＝0.151×k×Flow
feed?water+0.625L/h
Wherein, FLOW
O2Add oxygen flow, L/h for feedwater; Flow
Feed waterBe feedwater flow, m
3/ h; K is a relation conefficient, is confirmed by the dissolved oxygen amount target value that preestablishes the feedwater of economizer inlet;
(3) according to the oxygen flow that adds that calculates the oxygenation operation is carried out in feedwater.
In the oxygenation operating process; Because feedwater flow is in continuous variation; Cause the dissolved oxygen amount target value of dissolved oxygen amount actual value and feedwater to have deviation, at this moment, need the dissolved oxygen amount of real-time detection practical economizer inlet feedwater; When the dissolved oxygen amount target value that feeds water when the dissolved oxygen amount measured value of economizer inlet feedwater and predetermined economizer inlet has deviation; Proportion of utilization-integration-differential control (PID bias adjustment), operation is finely tuned to oxygenation, and is consistent with the dissolved oxygen amount target value that predetermined economizer inlet feeds water until the measured value of the dissolved oxygen amount of economizer inlet feedwater.
Because recycling of feedwater; Metallic cation owing to corrosion dissolution in the feedwater is more and more; Cause water quality deterioration; Cause feedwater water quality further to worsen for preventing to continue oxygenation, a kind of optimized technical scheme is: the hydrogen electricity that the hydrogen electricity that the hydrogen electricity of in step (1), setting the feedwater of deoxygenator inlet is simultaneously led the upper limit, deoxygenator outlet feedwater is led the upper limit and the feedwater of economizer inlet is led and is limited to H
The upper limitDetect the hydrogen electricity of deoxygenator inlet feedwater then in real time and lead H
a, deoxygenator outlet feedwater the hydrogen electricity lead H
bLead H with the hydrogen electricity of economizer inlet feedwater
c, and do following processing according to detected value: (i) H
a, H
bAnd H
cIn any two values all greater than H
The upper limitThe time, report to the police, stop the oxygenation operation simultaneously, until H
a, H
bAnd H
cIn at least two all less than H
The upper limit, feedwater adds oxygen flow in the recovering step (2).
Oxygenation to feedwater is handled, and is that wall energy forms sull in economizer, high pressure heater and the deoxygenator in order to make on the one hand, protects it not corroded; On the other hand; Should prevent because hot environment; The affiliation that too much adds of oxygen causes serious corrosion to the tube wall of low temperature superheater, pendant superheater, finishing superheater and final reheater, so a kind of optimized technical scheme is: in step (1), set the dissolved oxygen amount higher limit of economizer exit feedwater, the dissolved oxygen amount higher limit of steam separator outlet feedwater and the dissolved oxygen amount higher limit of finishing superheater outlet steam simultaneously; Detect the dissolved oxygen amount of economizer exit feedwater, the dissolved oxygen amount of steam separator outlet feedwater and the dissolved oxygen amount of finishing superheater outlet steam then in real time; If when having one to reach its corresponding higher limit in three detected values of dissolved oxygen amount of the dissolved oxygen amount of the dissolved oxygen amount of economizer exit feedwater, steam separator outlet feedwater and finishing superheater outlet steam; Report to the police; Turn the oxygen flow that adds of feedwater simultaneously down; Until the detected value of the dissolved oxygen amount of the dissolved oxygen amount of the dissolved oxygen amount of economizer exit feedwater, steam separator outlet feedwater and finishing superheater outlet steam all less than its corresponding higher limit, the feedwater in the recovering step (2) add oxygen flow.
The full-automatic boiler feed water oxygenation device of the utility model, this device can be realized the full automatic control of oxygenation, sampling point is arranged comprehensive and reasonable; Adopt intelligence oxygenation control techniques automatically; The oxygenation regulating is sensitive, control is convenient, dissolved oxygen and redox potential target value control stabilization, and be provided with warning and defence program; Need not manual intervention, safety economy.
The utility model adopts the compound oxygenation of feedwater to handle (OT) mode; Through full intelligent control oxygenation technology; With the feedwater flow is that the auxiliary PID control of feedforward (PID bias adjustment) is carried out micro-oxygenation to feedwater, and then changes the structure and the form of steam contact interface sull, makes sull firm compact more; Alleviate even stop the generation of water feeding system FAC; Thereby solve the difficult problem of water feeding system current accelerated corrosion, prolong service life of equipment, energy-saving and cost-reducing, improve the economic and social benefits.
The utility model adopts full intelligent control thermal power plant large vol supercritical unit to feed water after the compound oxygenation test, is avoiding full volatilization to handle the problem that causes easily, has the following advantages simultaneously:
1, the original Fe of the new unit water feeding system of capital construction
3O
4Sull is thinner, utilize the method and apparatus oxygenation of the utility model after, fine and close Fe
2O
3The sull conversion rate is very fast, and required time is far smaller than the operation unit, the new unit of capital construction is implemented feed water oxygenation as early as possible have obvious meliority after steam is up-to-standard.
2, under traditional AVT operating mode, unit operation is after for some time, and boiler pressure reduction rises obviously; After adopting the OT operating mode operation of the utility model, boiler pressure reduction descends significantly.
3, under traditional AVT operating mode, feedwater Fe concentration is bigger; Under the OT of the utility model operating mode, along with the rising of redox potential (ORP), Fe concentration obviously descends.
4, adopt intelligence oxygenation control techniques automatically; With the feedwater flow is the auxiliary PID control of feedforward (PID bias adjustment), and micro-oxygenation is carried out in feedwater, and regulation quality is accurate; Can change timely and effective adjustment oxygen-adding amount according to unit load, steadily control feedwater dissolved oxygen amount and ORP; Be aided with simultaneously and report to the police and guarded command, keep the operation of unit safety economy under the OT operating mode.
Description of drawings
Fig. 1 is oiler feed operational system figure in the prior art;
Fig. 2 is the theory structure synoptic diagram of the full-automatic boiler feed water oxygenation device of the utility model;
The actual detected figure of Fig. 3 for utilizing the PID bias adjustment that the dissolved oxygen amount target value of predetermined economizer inlet feedwater is regulated among the embodiment.
Embodiment
Be example with the existing oiler feed recycle system below, the full-automatic boiler feed water oxygenation device and the method for the utility model be described further:
As shown in Figure 1; The oiler feed recycle system that Fig. 1 is to be detected: comprise placed in-line successively turbine, condenser, coagulate pump, coagulation bed, low pressure feed water system, deoxygenator, high pressure heater, economizer, water screen system, steam separator low temperature superheater, pendant superheater and finishing superheater, also comprise the final reheater that a part of steam in the turbine is carried out pick up the heat in addition.The operational process of the above-mentioned recycle system is: a steam part of coming out from turbine branches to reuse after heating the final reheater; All the other gas-liquid mixtures that come out from turbine are through the condenser condensation; Condensed water, hydrophobic and extraneous supplementary feed mix bed through coagulating pumping toward coagulating then; Carry out preliminary low-temperature heat through coagulating the recirculated water entering low pressure feed water system of mixing after bed softens, handle through deoxygenator then, part of oxygen and steam are discharged; The recirculated water that deoxygenator comes out gets into steam separator again after high pressure heater, economizer and water screen system heating; The steam of being discharged by steam separator gets into turbine after low temperature superheater, pendant superheater and finishing superheater bakingout process, become mechanical work to the thermal power transfer of carrying in the steam by turbine, exports electric energy at last.
Like Fig. 2 is the full-automatic boiler feed water oxygenation device of the utility model, comprising: flow detector 1, dissolved oxygen amount proofing unit 2, redox potential proofing unit 3, hydrogen conductive detection device 4, electro connecting pressure gauge 5, flow director 6, first flow meter 7, first variable valve 8, second under meter 9, second variable valve 10 and the PLC.
The dissolved oxygen amount proofing unit is provided with 4 detection heads; 4 detection heads are located at respectively on the pipeline of economizer inlet, economizer exit, steam separator outlet and finishing superheater outlet, are used for detecting the dissolved oxygen amount of the feedwater of economizer inlet, economizer exit, steam separator outlet and finishing superheater outlet.The hydrogen conductive detection device comprises 3 detection heads, and 3 detection heads are located at respectively on the pipeline of deoxygenator inlet, deoxygenator outlet and economizer inlet, and the hydrogen electricity that is used for detecting the feedwater of deoxygenator inlet, deoxygenator outlet and economizer inlet is led.The detection head of redox potential proofing unit is located on the pipeline of economizer exit, is used for detecting the redox potential of the feedwater of economizer exit.
PLC is provided with audio alarm, occurs when unusual when PLC detects controlled variable, and PLC reports to the police automatically, and takes corresponding measure of control.
Utilize said apparatus that oxygenation control is carried out in the feedwater of the recycle system shown in Figure 1, method steps is following:
(1) preestablish the dissolved oxygen amount target value DO that the economizer inlet feeds water, for example DO is 40ug/L;
(2) detect feedwater flow; For example feedwater flow is 2000L/h; Dissolved oxygen amount target value according to feedwater flow and the feedwater of predetermined economizer inlet calculates the mass flow controller aperture: under the dissolved oxygen amount target value of different feedwater, the dependency of feedwater flow and mass flow controller aperture is:
When target value DO=60ug/L, KD=0.0124Flow
Feed water
When target value DO=50ug/L, KD=0.0103Flow
Feed water
When target value DO=40ug/L, KD=0.0083Flow
Feed water
When target value DO=30ug/L, KD=0.0062Flow
Feed water
When target value DO=20ug/L, KD=0.0041Flow
Feed water
Can obtain adding oxygen flow according to the mass flow controller aperture then, the mass flow controller aperture with the dependency that adds oxygen flow is:
FLOW
O2＝0.151KD+0.625L/h(0≤KD≤100，％)
Wherein: DO is the dissolved oxygen amount target value of economizer inlet feedwater, μ g/L; KD is the mass flow controller aperture, %; Flow
FeedwaterBe feedwater flow, L/h; FLOW
O2For adding oxygen flow, L/h).
In the step (1), for automatic control ORP in the reasonable scope, control Fe concentration is provided with the dissolved oxygen amount target value that ORP regulates the feedwater of economizer inlet automatically in low scope: when the ORP of the economizer exit feedwater of actual detected reaches higher limit ORP
1(higher limit can be selected a numerical value among the 180-200 μ g/L; Specifically can confirm according to real system) time; Automatic control program is adjusted the dissolved oxygen amount target value (the dissolved oxygen target value is reduced 5 μ g/L) of economizer inlet feedwater automatically according to the size of the ORP of the economizer exit feedwater of actual detected; Program is in time adjusted the mass flow controller aperture then automatically, and the adjustment oxygen-adding amount makes the oxyty of economizer inlet feedwater consistent with the dissolved oxygen amount target value that the economizer inlet feeds water.When the ORP of the economizer exit of actual detected feedwater reaches lower value ORP
2(lower value can be selected a numerical value among the 80-100 μ g/L; Specifically can confirm according to real system) time; Automatic control program is adjusted the dissolved oxygen amount target value (the dissolved oxygen target value raises 5 μ g/L) of economizer inlet feedwater automatically according to the size of the ORP of the economizer exit feedwater of actual detected; Program is in time adjusted the mass flow controller aperture then automatically, and the adjustment oxygen-adding amount makes economizer inlet oxyty consistent with target value.Work as ORP
2＜ORP＜ORP
1The time, get into step (2) according to the dissolved oxygen amount target value that preestablishes the feedwater of economizer inlet.
When unit load changed, corresponding variation can appear in feedwater flow, this moment automatically oxygenation control system can be automatically based on the aperture of the size adjustment mass flow controller of feedwater flow, ensure to the accuracy and the stability of oxygen in water; When if the dissolved oxygen amount of real-time detection practical economizer inlet feedwater this moment and the dissolved oxygen amount desired value of predetermined economizer inlet feedwater have deviation; Proportion of utilization-integration-differential control (PID bias adjustment); Oxygenation operation is finely tuned, consistent until the measured value of the dissolved oxygen amount of economizer inlet feedwater with the dissolved oxygen amount desired value that predetermined economizer inlet feeds water; The setting of parameter can be confirmed based on the actual motion system in the PID bias adjustment process.
We choose in 24 hours the working control process and see Fig. 3, among Fig. 3, and Flow
FeedwaterBe feedwater flow, DO is the dissolved oxygen amount target value of economizer inlet feedwater, and ORP is a redox potential; Time is the time: in 24 hours; Unit load changes continuously, and this moment, the dissolved oxygen target value of economizer import feedwater was controlled at 40 μ g/L, because the control of oxygenation program automatically; Unit load rose in 0-10 hour, and this moment, feedwater flow was from 1300m
3/ h rises to 2400m
3About/h, oxygen-adding amount is along with the conversion of flow is regulated automatically, but that just keeping behind the minor swing appears in the oxyty of economizer inlet feedwater is stable, and the ORP of economizer exit feedwater drops to about 130mV from 150mV; 10-12 hour, when load reduced, feedwater flow reduced, and oxyty rises slightly in feedwater this moment, and the ORP of economizer exit feedwater also rises slightly; From 12 hours to 22 hours, feedwater flow increased afterwards earlier and reduces, and this moment, economizer exit ORP reduced earlier afterwards to increase, and economizer inlet dissolved oxygen is quite steady, all the time near target value.
Under feedwater water quality deterioration situation, for preventing oxygenation system is caused damage, the hydrogen electricity is set, and to lead the upper limit alarm method following:
(1) the hydrogen electricity that deoxygenator inlet feedwater is set is led higher limit, and (higher limit can be chosen the numerical value of 0.15-0.20 μ s/cm; Confirm according to practical situation), hydrogen electricity that deoxygenator outlet feedwater is set leads higher limit (higher limit can be chosen the numerical value of 0.15-0.20 μ s/cm; Confirm according to practical situation) the hydrogen electricity that feeds water with the economizer inlet leads higher limit (higher limit can be chosen the numerical value of 0.15-0.20 μ s/cm; Confirm according to practical situation); When deoxygenator inlet, deoxygenator outlet and economizer inlet three hydrogen electricity led that the hydrogen electric conductivity value that records of any two tables reaches its corresponding higher limit in the table, the PLC system sent audio alarm, and the oxygenation system is in time according to water quality adjustment oxygenation strategy automatically: when any two hydrogen electricity dodar during to higher limit; System stops oxygenation; Treat that quality recovery is normal, promptly deoxygenator inlet, deoxygenator outlet and economizer inlet three hydrogen electricity are led when the hydrogen electric conductivity value that records of any two tables is lower than higher limit in the table, adjust back to add oxygen flow originally.In this control method; Select just to control in limited time to last when any two hydrogen electricity dodar; Mainly be to lead table itself when breaking down when some hydrogen wherein for preventing; Cause hydrogen electricity derivative value to be higher than higher limit, system PLC takes wrong measure of control to control the detrimentally affect that system is brought to adding oxygen flow.
In the practical operation; The source of oxygen pipeline is general to connect electro connecting pressure gauge behind ventilatory assistance bus-bar, decompression venting valve, electrical ball valve, surge tank, safety valve and the pressure-reducing valve earlier successively again; Simultaneously to electro connecting pressure gauge setting pressure scope (specifically deciding) based on system equipment; When feed water oxygenation device loine pressure was excessive or too small, the PLC system sent audio alarm, in time adjusted pressure and met oxygenation control requirement: when pressure is excessive; Control system adjustment pressure guarantees that oxygenation carries out smoothly in requiring to control; When pressure was too small, control system adjustment pressure if pressure is still too small after adjustment, then needed the artificial oxygen bottle of changing to controlling requirement, guarantees that oxygenation carries out smoothly.
Get in the finishing superheater for fear of too much dissolved oxygen, the dissolved oxygen upscale protection is set, concrete grammar is:
(concrete higher limit can be selected among the 50-80 μ g/L to dissolved oxygen amount higher limit in the feedwater of setting economizer inlet; Can confirm based on concrete system), (concrete higher limit can be selected among the 3-10 μ g/L to steam-water separator outlet dissolved oxygen amount higher limit; Can confirm based on concrete system) with the finishing superheater feedwater in the dissolved oxygen amount higher limit (specifically higher limit can be selected among the 5-10 μ g/L; Can confirm based on concrete system); The dissolved oxygen value that any one table instrumentation gets in economizer inlet, steam-water separator outlet and finishing superheater three dissolved oxygen table reaches in limited time, and PLC sends audio alarm; Based on timely mass flow controller to the minimum aperture (0%-10% specifically establishes based on instrument and equipment) of adjusting automatically of oxyty program,, the dissolved oxygen index moves the original oxygen flow that adds after reaching requirement automatically simultaneously.
Because what of feedwater, condensed water or hydrophobic dissolved oxygen content, influence the structure and the form of sull on the one hand, the production rate of controlled oxidation film; Influence service life of equipment, systematic economy safe operation on the other hand, therefore when unit load changed, it was most important stably to control oxygen-adding amount.Mass flow controller possesses voltage stabilizing, adds oxygen flow adjusting and controlled feedback function automatically, and the stable of flow director import and export pressure of ensuring the quality of products on the one hand reduces fluctuation; Can regulate automatically on the other hand and add oxygen flow and carry out flow feedback, require to guarantee the required stable oxygen-adding amount of feedwater according to reality.
Claims (6)
1. a full-automatic boiler feed water oxygenation device comprises PLC, it is characterized in that, also comprises:
Flow detector is gathered feedwater flow and the feedwater flow signal is transferred to PLC;
The dissolved oxygen amount proofing unit, the dissolved oxygen amount of acquisition testing point also is transferred to PLC with the dissolved oxygen amount signal;
The redox potential proofing unit, the redox potential of acquisition testing point also is transferred to PLC with the redox potential signal;
The hydrogen conductive detection device, the hydrogen electricity of acquisition testing point is led and the hydrogen conductance signal is transferred to PLC;
Flow director links to each other with source of oxygen and according to the oxygen flow that adds of PLC instruction control feedwater.
2. full-automatic boiler feed water oxygenation device according to claim 1 is characterized in that described flow director is a mass flow controller, and the flow signal output terminal of mass flow controller links to each other with the PLC input terminus.
3. full-automatic boiler feed water oxygenation device according to claim 2 is characterized in that the pipeline between described source of oxygen and the mass flow controller is provided with electro connecting pressure gauge, and the signal output part of electro connecting pressure gauge links to each other with the PLC input terminus.
4. according to claim 2 or 3 described full-automatic boiler feed water oxygenation devices; It is characterized in that; Described mass flow controller is provided with two parallelly connected pipelines with the pipeline that adds between the oxygen point of feedwater; Wherein be in series with first flow meter and first variable valve of controlling the first flow meter, second variable valve that is in series with second under meter on another pipeline and controls second under meter on a pipeline.
5. full-automatic boiler feed water oxygenation device according to claim 1; It is characterized in that; Described dissolved oxygen amount proofing unit comprises the plurality of detection head, and the plurality of detection head is located at respectively on the pipeline of economizer inlet, economizer exit, steam separator outlet and finishing superheater outlet; Described hydrogen conductive detection device comprises the plurality of detection head, and the plurality of detection head is located at respectively on the pipeline of deoxygenator inlet, deoxygenator outlet and economizer inlet; The detection head of described redox potential proofing unit is located on the pipeline of economizer exit.
6. full-automatic boiler feed water oxygenation device according to claim 1 is characterized in that described PLC has warning device.
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| CN2012201437290U CN202542958U (en) | 2012-04-06 | 2012-04-06 | Fully-automatic boiler water supplying and oxygen feeding device |
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| CN104326547B (en) * | 2014-10-23 | 2015-12-09 | 国家电网公司 | A kind of coal unit Boiler High Pressure feeds water micro-oxygen accurate control method and device |
| CN108558030A (en) * | 2018-03-15 | 2018-09-21 | 湖南省湘电试验研究院有限公司 | A kind of automatic oxygen-enrichment system of water supply and method |
| CN108558030B (en) * | 2018-03-15 | 2021-01-29 | 湖南省湘电试验研究院有限公司 | Automatic water supply oxygenation system and method |
| CN110217900A (en) * | 2019-04-18 | 2019-09-10 | 西安热工研究院有限公司 | A kind of automatic oxygenation of power plant water supply and the collaboration precise control device and method of ammonification |
| CN110217900B (en) * | 2019-04-18 | 2023-10-13 | 西安热工研究院有限公司 | Cooperative precise control device and method for automatic oxygenation and ammonia addition of power plant water supply |
| CN111552225A (en) * | 2020-04-28 | 2020-08-18 | 润电能源科学技术有限公司 | System and method for adjusting oxygen addition amount of boiler feed water |
| CN112551705A (en) * | 2020-12-03 | 2021-03-26 | 河南省日立信股份有限公司 | Micron bubble boiler water supply and oxygen adding device |
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Address after: 310003 Hangzhou City, Fung Fung Road, No. Guoxin real estate building, building 15, building 108 Patentee after: Zhejiang Co., Ltd of Zhe Neng Institute for Research and Technology Address before: Hangzhou City, Zhejiang province 310052 Binjiang District Binsheng Road No. 1751 zheneng second building 3 floor Patentee before: Zhejiang Zheneng Energy Technology Co.,Ltd. |
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