CN102745753B - Draining and oxygen adding method for full-automatic heater - Google Patents
Draining and oxygen adding method for full-automatic heater Download PDFInfo
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- CN102745753B CN102745753B CN 201210223826 CN201210223826A CN102745753B CN 102745753 B CN102745753 B CN 102745753B CN 201210223826 CN201210223826 CN 201210223826 CN 201210223826 A CN201210223826 A CN 201210223826A CN 102745753 B CN102745753 B CN 102745753B
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Abstract
The invention discloses a draining and oxygen adding device for a full-automatic heater. The device comprises the following components: a PLC; a pressure detector for collecting a pressure signal in pipeline at an oxygen adding point, and transmitting the pressure signal to the PLC; a dissolved oxygen content detector for collecting a dissolved oxygen content at a detecting point and transmitting the dissolved oxygen content signal to the PLC; an oxidation-reduction potential detector for collecting an oxidation-reduction potential at the detecting point and transmitting the oxidation-reduction potential signal to the PLC; a hydrogen conductivity detector for collecting hydrogen conductivity at the detecting point and transmitting the hydrogen conductivity signal to the PLC; and a flow controller connected with an oxygen source and for controlling oxygen addition flow according to the PLC command. The invention also discloses a draining and oxygen adding method for the automatic heater. The oxygen adding device of the invention can avoid clogging of a drainage valve on a high-pressure heater shell side pipeline, and maintain safe and economical operation of the unit at an OT working conditions.
Description
Technical field
The invention belongs to electric power and power engineering control techniques field, specifically relate to a kind of full-automatic heater condensate aeration device and method.
Background technology
The structure of existing super (surpassing) critical thermal power generation unit one through boiler steam recycle system and high pressure heater draining system respectively as depicted in figs. 1 and 2.
As shown in Figure 1, in one through boiler, the feedwater of deoxygenator is after service pump boosts, the high pressure heater tube side of sequentially flowing through, economizer, water screen system, finish the heating of feedwater, evaporation, and become superheated vapour through heating surface such as three and send boiler, enter the steam turbine high-pressure cylinder acting, the cold reheated steam of finishing merit is returned boiler reheater (being final reheater) and is heated up again and become reheat heat steam, then order enters Steam Turbine Through IP Admission and low pressure (LP) cylinder acting, steam discharge enters the condenser condensation, the condensed water of in condenser hotwell, converging then, hydrophobic and extraneous supplementary feed is sent to the polishing unit that condenses through condensate pump, gland heater, enter deoxygenator behind the low pressure heater, rely on the power of service pump to carry out next one circulation once more.
The high pressure heater shell side is the part high-temperature steam that steam turbine is discharged, and utilizes high-temperature steam that the feedwater in the tube side is heated.Become liquid after this part high-temperature steam discharges a part of heat, be back in the deoxygenator, and mix with wherein feedwater and to carry out follow-up circulation with hydrophobic form.The hydrophobic employing of high pressure heater is step by step from stream mode.As shown in Figure 2, high pressure heater is generally three grades of high pressure heaters that polyphone is provided with, and every grade of high pressure heater can be made up of single high pressure heater or the many groups that are arranged in parallel high pressure heater.
The particular procedure technology of high pressure heater draining system causes the mobile accelerated corrosion (FAC) of this system; this corrosion is that (reductibility is handled and full volatilization is handled) takes place under specific steam temperature range, high flow rate, particular chemical operating mode; at this moment; the redox potential of hydrophobic medium (ORP) very low (less than 0); temperature is the zone between normal temperature to 300 ℃; water and carbon steel generate loose Fe 3 O 4 magnetic oxide film by electrochemical reaction, can't make metal enter passivation region and generate fine and close ferric oxide protective membrane.Mobile accelerated corrosion makes the content height of hydrophobic middle iron, the solubleness of this Z 250 film is in about 150 ℃ of-200 ℃ of solubleness maximums, and has stronger magnetic, valve and hole place in some ferromegnetism materials, locate to form deposition and periodically stop up as high pressure heater drain valve (being equipped with drain valve), desuperheating water variable valve, sampling valve etc., the adjusting function of unit is impacted at #1 high pressure heater, #2 high pressure heater and the outlet of #3 high pressure heater shell side.
It mainly is to handle at the oxygenation that feeds water that present oxygenation is handled, and the relevant report of handling at hydrophobic oxygenation is not also arranged.Therefore, for orientation solves the high pressure heater FAC of system problem, prevent that the high pressure heater drain valve from stopping up, both promoted hydrophobic redox potential, being unlikely to again had polyoxy to enter steam system, explore Boiler High Pressure well heater vapour side (hydrophobic) aeration device and the method for a kind of novel automatic safety economy of invention, will have far-reaching economic benefit and social benefit.
Summary of the invention
The invention provides a kind of full-automatic heater condensate aeration device; avoid hydrophobic periodicity to stop up to the high pressure heater drain valve; and this device can be realized the full automatic control of oxygenation; sampling point is arranged comprehensive and reasonable; oxygenation Flow-rate adjustment sensitivity, control convenience, 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 heater condensate aeration device comprises:
PLC；
Pressure-detecting device is gathered the hydrophobic pressure signal that adds the oxygen point place, and this pressure 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 hydrophobic oxygen flow that adds that adds oxygen point of PLC instruction control.
The redox potential signal of the pressure signal of PLC reception pressure-detecting device, 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, simultaneously send steering order, realize adding the control of oxygen point oxygenation flow by flow director to flow director.
By can understand the detection of dissolved oxygen amount hydrophobic in the content of oxygen, and then need can to determine the flow of the oxygen that adds; By real-time detection to redox potential, can understand the formation state of oxide film, by regulating oxygen-adding amount, can control the formation state of Fe ionic concn and oxide film, make it form fine and close ferric oxide protective membrane; By the real-time detection that the hydrogen electricity is led, can understand the water and steam quality situation and, oxygen-adding amount be carried out limit control the influence degree of corrosion of piping.By dissolved oxygen amount, hydrogen electricity being led control, when guaranteeing that tube wall forms fine and close ferric oxide protective membrane, reduce the corrosion that too much oxygen causes pipeline as far as possible with the system of redox potential.
Well heater of the present invention is that tube side is connected on three high pressure heaters between deoxygenator water outlet and the economizer water inlet in the thermal power generation unit one through boiler steam recycle system; The shell side of three high pressure heaters is series connection successively also, be respectively #1 high pressure heater, #2 high pressure heater and #3 high pressure heater, the at different levels of steam turbine that the shell side of each high pressure heater inlet is started to exchange fire respectively in the power generator group bleed the water inlet of the shell side outlet tieback deoxygenator of last high pressure heater.
For further avoiding stopping up the drain valve on the high pressure heater shell side export pipeline, generally will add oxygen point is arranged on the pipeline between steam turbine and the import of #1 high pressure heater shell side, the oxygen that adds is bled with one-level and is mixed, at this moment, the pressure signal of pressure-detecting device collection is the pressure signal that the one-level of coming out from steam turbine is bled.
For ease of control, 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 to detect and also can detect information transmission, can control adding oxygen flow according to the feedback command of PLC simultaneously, improved the stability of oxygenation flow control to PLC to the flux values of check point.
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 (specifically deciding) in electro connecting pressure gauge according to system device, when the aeration device line pressure is excessive or too small, system sends audio alarm, in time adjust pressure and meet oxygenation control requirement: when pressure is excessive, Controlling System can be adjusted pressure to the control requirement by reducing valve is set, and guarantees that oxygenation carries out smoothly; When pressure was too small, Controlling System was adjusted pressure to controlling requirement, and pressure is thrown over and hour can be considered manually to change oxygen bottle through adjusting after, and the assurance oxygenation carries out smoothly.
For guaranteeing carrying out smoothly of aeration device oxygenation operation, the pressure of oxygen need be greater than adding the pressure that one-level is bled in the oxygen point place pipeline in the aeration device pipeline, for avoiding because the too small frequent replacing source of oxygen steel cylinder of pressure, further optimized technical scheme is: the pipeline between described electro connecting pressure gauge and the mass flow controller is provided with gas boosting pump, surge tank and the reducing valve that polyphone successively is provided with; Described reducing valve is located on the pipeline between described surge tank and the mass flow controller; Described gas boosting pump is controlled by described PLC.During actual motion,, set the pressure threshold of gas boosting pump, the peak pressure that pressure threshold is generally bled greater than one-level by PLC according to the bleed peak pressure of operation of one-level; When pressure threshold that the pressure of source of oxygen is set in greater than the gas boosting pump, the gas boosting pump is in channel status, and oxygen directly passes through, and in the scope of setting, carries out the oxygenation operation through reducing valve control stable gas pressure then; When pressure threshold that the pressure of source of oxygen is set less than the gas boosting pump, the gas boosting pump is in pressurized state, and the oxygen that source of oxygen is come out carries out supercharging earlier, and the oxygen after the supercharging enters in the surge tank, in the scope of setting, carry out the oxygenation operation through reducing valve control stable gas pressure then.The pressure-stabilisation that the assurance system is set of surge tank is avoided the change of pressure and frequent unlatching gas boosting pump carries out the supercharging operation, has improved the work-ing life of gas boosting pump, has guaranteed stable the carrying out of oxygenation operation simultaneously.
Respectively based on above-mentioned three kinds of technical schemes, form three kinds of further preferred schemes, wherein said mass flow controller is provided with two pipelines in parallel with the pipeline that adds between the oxygen point, 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 flow control 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.
For ease of realizing that device of the present invention can carry out Comprehensive Control to water quality and dissolved oxygen amount according to the 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 the outlet of #1 high pressure heater shell side, the outlet of #3 high pressure heater shell side 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 finishing superheater outlet, the outlet of #1 high pressure heater shell side and the outlet of #3 high pressure heater shell side; Described redox potential proofing unit comprises the plurality of detection head, and the plurality of detection head is located at respectively on the pipeline of the outlet of #1 high pressure heater shell side, the outlet of #3 high pressure heater shell side.For example, hydrophobic when adding oxygen flow in needs are determined high pressure heater, need to detect one-level suction pressure and the hydrophobic dissolved oxygen amount of #1 high pressure heater shell side outlet; For understanding the dissolved oxygen amount that enters in the deoxygenator, be convenient to carry out oxygenation and regulate protection control automatically simultaneously, at this moment, need to detect the hydrophobic dissolved oxygen amount of #3 high pressure heater shell side outlet; Under the water quality deterioration situation (hydrogen electricity dodar is to the upper limit), for preventing that adding oxygen excess causes damage to system, then need to carry out oxygenation and regulate controlling alarm automatically, at this moment, the hydrogen electricity that needs to detect finishing superheater outlet, the outlet of #1 high pressure heater shell side, #3 high pressure heater shell side outlet water sample is led.Simultaneously, for preventing because hot environment, the affiliation that too much adds of oxygen causes negative impact to the tube wall of low temperature superheater, pendant superheater, finishing superheater and final reheater, needs to detect the dissolved oxygen amount of finishing superheater outlet.
Too much adding is to the negative impact of low temperature superheater, pendant superheater and finishing superheater in order further to avoid oxygen, and as further preferred, described hydrogen conductive detection device also comprises the detection head on the pipeline of being located at the steam separator outlet; Described dissolved oxygen amount proofing unit also comprises the detection head on the pipeline of being located at the steam separator outlet.Detecting the dissolved oxygen amount and the hydrogen electricity of steam separator outlet and finishing superheater outlet simultaneously leads, low temperature superheater, pendant superheater and finishing superheater are carried out double-ended control, further reduced because of adding hyperoxia and caused negative impact low temperature superheater, pendant superheater and finishing superheater.
Described PLC has warning device.The setting of warning device, make in hydrophobic water quality deterioration, too much dissolved oxygen enter finishing superheater or line pressure when excessive or too small, PLC can remind the field personnel to check in the self-adjusting while, has improved security of pipeline round-robin and stability greatly.
The present invention also provides a kind of full-automatic heater condensate oxygenation method, and this method is regulated control accurately, can change timely and effective adjustment oxygen-adding amount according to unit load, steadily controls hydrophobic 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 heater condensate oxygenation method comprises:
(1) preestablishes the hydrophobic dissolved oxygen amount target value DO of #1 high pressure heater shell side outlet;
Set the higher limit ORP1 of the hydrophobic redox potential of #3 high pressure heater shell side outlet;
Set the lower value ORP2 of the hydrophobic redox potential of #3 high pressure heater shell side outlet;
Detect the hydrophobic redox potential ORP of #3 high pressure heater shell side outlet then, and the hydrophobic dissolved oxygen amount target value DO of predefined # 1 high pressure heater shell side outlet carried out following adjustment:
(i) when ORP2＜ORP＜ORP1, hydrophobic dissolved oxygen amount target value DO enters step (2) according to predefined # 1 high pressure heater shell side outlet;
(ii) when ORP 〉=ORP1, reduce the hydrophobic dissolved oxygen amount target value DO of #1 high pressure heater shell side outlet,, get back to step (i) until ORP2＜ORP＜ORP1;
(iii) when ORP≤ORP2, increase the hydrophobic dissolved oxygen amount target value DO of #1 high pressure heater shell side outlet,, get back to step (i) until ORP2＜ORP＜ORP1;
(2) detect the pressure that #1 high pressure heater shell side ingress one-level is bled, the hydrophobic dissolved oxygen amount target value DO of predefined # 1 high pressure heater shell side outlet that finally obtains according to one-level suction pressure and step (1) calculates the hydrophobic oxygen flow that adds that adds oxygen point;
The described hydrophobic pass that adds between oxygen flow and the one-level suction pressure that adds oxygen point is:
FLOW
O2＝0.151L/h×(k×Pressure+b)+0.625L/h
Wherein, FLOW
O2Be the hydrophobic oxygen flow that adds that adds oxygen point, L/h; Pressure is the one-level suction pressure, MPa; K is a relation conefficient, MPa
-1B is a relation conefficient, and k and b are determined by the hydrophobic dissolved oxygen amount target value DO of predefined # 1 high pressure heater shell side outlet;
(3) according to the oxygen flow that adds that calculates the hydrophobic oxygen point that adds is carried out the oxygenation operation.
In the oxygenation operating process, because the one-level suction pressure is in continuous variation, cause #1 high pressure heater shell side to export the hydrophobic dissolved oxygen amount target value DO of hydrophobic dissolved oxygen amount actual value and #1 high pressure heater shell side outlet and have deviation, at this moment, need the hydrophobic dissolved oxygen amount of real-time detection practical # 1 high pressure heater shell side outlet, when hydrophobic dissolved oxygen amount measured value of #1 high pressure heater shell side outlet and predefined # 1 high pressure heater shell side export hydrophobic dissolved oxygen amount target value DO deviation are arranged, proportion of utilization-integration-differential control (PID bias adjustment), operation is finely tuned to oxygenation, and is consistent until the dissolved oxygen amount target value DO that the measured value and the predefined # 1 high pressure heater shell side outlet of the hydrophobic dissolved oxygen amount of #1 high pressure heater shell side outlet are hydrophobic.
Because recycling of carbonated drink, because of the metallic cation of corrosion dissolution more and more, cause feedwater and drain water quality to worsen, for preventing that continuing oxygenation causes the further detrimentally affect that worsens low temperature superheater, pendant superheater, finishing superheater and final reheater of water quality, a kind of optimized technical scheme is: set the hydrogen electricity simultaneously and lead higher limit H in step (1)
The upper limitGather the hydrogen electricity derivative certificate of different check points in real time, constitute the hydrogen electricity and lead the detection data acquisition, this set comprises following element: the hydrogen electricity of finishing superheater outlet water sample is led H
a, the hydrophobic hydrogen electricity of #1 high pressure heater shell side outlet leads H
bLead H with the hydrophobic hydrogen electricity of #3 high pressure heater shell side outlet
cAnd the hydrogen electricity led element and the H that detects in the data acquisition
The upper limitContrast is done following processing: then if the hydrogen electricity is led the value of any two elements in the detection data acquisition all greater than H
The upper limitThe time, report to the police, stop the oxygenation operation simultaneously, at least one is less than H in above-mentioned two elements
The upper limit, the hydrophobic oxygen flow that adds that adds oxygen point in the recovering step (2).
For further reducing because water quality further worsens the detrimentally affect that low temperature superheater, pendant superheater, finishing superheater and final reheater are caused, as further optimized technical scheme: described hydrogen electricity is led and is detected the hydrogen electricity that also comprises steam separator outlet water sample in the data acquisition and lead H
d
Oxygenation hydrophobic in the high pressure heater is handled, and is in order to make the interior wall energy of high pressure heater drain water piping (shell side) form oxide film, to protect it not corroded, preventing to stop up drain valve on the one hand; On the other hand, should prevent because hot environment, the affiliation that too much adds of oxygen causes negative impact 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 different check point dissolved oxygen amount higher limits simultaneously, constitute the set of dissolved oxygen amount higher limit, comprise following element in this set: dissolved oxygen amount higher limit, the #1 high pressure heater shell side of finishing superheater outlet water sample exports hydrophobic dissolved oxygen amount higher limit, #3 high pressure heater shell side exports hydrophobic dissolved oxygen amount higher limit; The dissolved oxygen amount of gathering different check points then in real time detects data, constitute dissolved oxygen amount and detect data acquisition, comprise following element in this set: the dissolved oxygen amount of finishing superheater outlet water sample, the dissolved oxygen amount of #1 high pressure heater shell side outlet and the hydrophobic dissolved oxygen amount of #3 high pressure heater shell side outlet, the element in the dissolved oxygen amount detection data acquisition is corresponding one by one with the element during the dissolved oxygen amount higher limit is gathered; Dissolved oxygen amount is detected the data of data acquisition and does following processing: the value that detects any one element in the data acquisition when dissolved oxygen amount greater than it in the set of dissolved oxygen amount higher limit during corresponding higher limit, report to the police, turn the hydrophobic oxygen flow that adds that adds oxygen point simultaneously down, until the value of this element less than its corresponding higher limit in the set of dissolved oxygen amount higher limit, the hydrophobic oxygen flow that adds in the recovering step (2).
For further reducing because hot environment, the affiliation that too much adds of oxygen causes negative impact to the tube wall of low temperature superheater, pendant superheater, finishing superheater and final reheater, as further optimized technical scheme: also comprise the higher limit of the dissolved oxygen amount of steam separator outlet water sample in the dissolved oxygen amount higher limit set described in the step (1), described dissolved oxygen amount detects the dissolved oxygen amount that also comprises steam separator outlet water sample in the data acquisition.
The present invention suppresses FAC under the situation that high pressure heater device structure and material can't change; by changing the processing mode (change water condition) of high pressure heater shell side; be converted into oxidizing atmosphere (oxygenation processing) from reducing atmosphere; original magnetic ferroferric oxide film is become ferric oxide protective membrane for densification; reach the purpose that suppresses mobile accelerated corrosion, solved the technical problem that drain valve stops up.
Full-automatic heater condensate aeration device of the present invention; this device can be realized the full automatic control of oxygenation; sampling point is arranged comprehensive and reasonable; adopt intelligence oxygenation control techniques automatically; oxygenation Flow-rate adjustment sensitivity, control convenience, dissolved oxygen and redox potential target value control stabilization, and be provided with warning and defence program; need not manual intervention, safety economy.
The present invention adopts hydrophobic oxygenation to handle (OT) mode, by full intelligent control oxygenation technology, serving as the auxiliary proportional-integral-differential control of feedforward (PID bias adjustment) with the one-level suction pressure carries out micro-oxygenation to hydrophobic, and then the structure and the form of change steam contact interface oxide film, make oxide film firm compact more, alleviate even stop the generation of draining system FAC, thereby solve the difficult problem of draining system current accelerated corrosion, prolong service life of equipment, energy-saving and cost-reducing, improve the economic and social benefits.
The present invention adopts the interior hydrophobic aeration device of full intelligent control thermal power plant's large vol supercritical unit high pressure heater shell side, is avoiding full volatilization to handle the problem that causes easily, has the following advantages simultaneously:
1, adopt traditional feed water oxygenation processing can occur that excessive oxygen enters main steam and the problem of bringing out superheater oxide skin, and that high pressure heater shell side (hydrophobic) oxygenation is handled is more targeted, can be directedly solved problems such as high pressure heater drain valve obstruction.
2, under traditional AVT operating mode, unit operation is after for some time, and the high pressure heater drain valve stops up obviously; After adopting OT operating mode operation of the present invention, the long-term normal operation of high pressure heater drain valve.
3, under traditional AVT operating mode, hydrophobic Fe concentration is bigger; Under OT operating mode of the present invention, along with the rising of hydrophobic redox potential (ORP), Fe concentration obviously descends.
4, adopt intelligence oxygenation control techniques automatically, and suction pressure is the auxiliary proportional-integral-differential control of feedforward (PID bias adjustment), carries out micro-oxygenation to hydrophobic, and regulation quality is accurate, can change timely and effective adjustment oxygen-adding amount according to unit load, steadily control hydrophobic 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 a boiler operatiopn system diagram in the prior art;
Fig. 2 adds oxygen point and check point distribution plan for the full-automatic heater condensate aeration device of the present invention;
Fig. 3 is the theory structure synoptic diagram of the full-automatic heater condensate aeration device of the present invention.
Embodiment
Be example with existing feedwater steam circulation system below, full-automatic heater condensate aeration device of the present invention and method be described further:
As shown in Figure 2, well heater of the present invention is that tube side is connected on three high pressure heaters between deoxygenator water outlet and the economizer water inlet; The shell side of three high pressure heaters is series connection successively also, is respectively #1 high pressure heater, #2 high pressure heater and #3 high pressure heater.The steam turbine outlet has three grades of shell sides that enter #1 high pressure heater, #2 high pressure heater and #3 high pressure heater respectively of bleeding to transfer to hydrophobic, hydrophobic gravity flow step by step in the high pressure heater shell side enters deoxygenator, then in deoxygenator enters the tube side of high pressure heater.Wherein, bleed for three grades: enter bleeding of #1 high pressure heater shell side and bleed, enter bleeding of #2 high pressure heater shell side and bleed, enter bleeding of #3 high pressure heater shell side and be three grades and bleed for secondary for one-level.One-level is bled, and to be converted into the #1 high pressure heater through #1 high pressure heater shell side hydrophobic, the #1 high pressure heater is hydrophobic to enter #2 high pressure heater shell side through the outlet of #1 high pressure heater shell side, bleed with secondary and to mix, hydrophobic through changing the #2 high pressure heater into behind the #2 high pressure heater shell side, the #2 high pressure heater is hydrophobic to be entered in the #3 high pressure heater shell side by the outlet of #2 high pressure heater shell side, bleed with three grades that to change the #3 high pressure heater into after mixing hydrophobic, the #3 high pressure heater is hydrophobic to be back in the deoxygenator through the outlet of #3 high pressure heater shell side.Wherein, add oxygen point and be arranged on the #1 high pressure heater shell side inlet ductwork, sampling spot is separately positioned on normal drain regulating valve of #1 high pressure heater and the normal drain regulating valve of #3 high pressure heater place.
As Fig. 3 is full-automatic heater condensate aeration device of the present invention, 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.
Pressure-detecting device 1 is used to detect one-level is bled in the high pressure heater shell side inlet ductwork pressure and one-level suction pressure signal is transferred to PLC; Dissolved oxygen amount proofing unit 2 can be selected conventional dissolved oxygen table for use, is used for the dissolved oxygen amount of continuous online acquisition check point and the dissolved oxygen amount signal is transferred to PLC; Redox potential proofing unit 3 is conventional redox potential table, is used for the redox potential of continuous online acquisition check point and the redox potential signal is transferred to PLC; Hydrogen conductive detection device 4 is led table for conventional hydrogen, and the hydrogen electricity that is used for continuous online acquisition check point is led and the hydrogen conductance signal is transferred to PLC; Electro connecting pressure gauge 5 is located on the delivery conduit of source of oxygen 12, and its signal output part links to each other with the PLC input terminus, is used for the pressure of continuous on-line detection oxygen pipeline, and pressure signal is inputed to PLC; Flow director 6 is a mass flow controller, its flow signal output terminal links to each other with the PLC input terminus, the oxygen flow that adds that is used for continuous online acquisition oxygen pipeline is exported to PLC with the oxygenation flow signal that detects simultaneously, controls adding oxygen flow according to the PLC feedback command then.
Mass flow controller is provided with two pipelines in parallel with the hydrophobic pipeline that adds between the oxygen point, wherein be in series with first flow meter 7 and first variable valve 8 of controlling first flow meter 7, second variable valve 10 that is in series with second under meter 9 on another pipeline and controls second under meter 9 on a pipeline.First flow meter 7, second under meter 9 all can be selected common multiple gases under meter, and first flow meter 7 is big oxygen flow meter, second under meter 9 is little oxygen flow meter, be used for on-the-spot the detection and add oxygen flow, when adding oxygen flow when big, enable big oxygen flow meter, add oxygen flow when less, start little oxygen flow meter, be convenient to the field staff and observe and reading; First variable valve 8 and second variable valve 10 are respectively applied for the control first flow meter 7 and second under meter 9.
The dissolved oxygen amount proofing unit is provided with 4 detection heads, 4 detection heads are located at respectively on the pipeline of the outlet of #1 high pressure heater shell side, the outlet of #3 high pressure heater shell side, steam separator outlet and finishing superheater outlet, are used for detecting in the outlet of #1 high pressure heater shell side, the outlet of #3 high pressure heater shell side is hydrophobic and the dissolved oxygen amount of steam separator outlet and finishing superheater outlet water sample.The hydrogen conductive detection device comprises 4 detection heads, 4 detection heads are located at respectively on the pipeline of the outlet of #1 high pressure heater shell side, the outlet of #3 high pressure heater shell side, steam separator and finishing superheater outlet, are used for detecting that the outlet of #1 high pressure heater shell side is hydrophobic, the outlet of #3 high pressure heater shell side is hydrophobic, the hydrogen electricity of steam separator and finishing superheater outlet water sample leads.The redox potential proofing unit is provided with 2 detection heads, be located at respectively on the pipeline of the outlet of #1 high pressure heater shell side, the outlet of #3 high pressure heater shell side, be used for detecting outlet of #1 high pressure heater shell side and the hydrophobic redox potential of #3 high pressure heater shell side outlet.Wherein, the dissolved oxygen amount detection head of steam separator outlet and hydrogen electricity are led detection head and also can be omitted in some cases.For example, in some feed water oxygenation system, the dissolved oxygen amount detection head is set and the hydrogen electricity is led detection head in steam separator outlet, can omit in the hydrophobic oxygenation system this moment dissolved oxygen amount detection head and hydrogen electricity lead detection head repeat be provided with.
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 the hydrophobic oxygenation that carries out of water-steam system shown in Figure 2 is controlled, method steps is as follows:
(1) preestablish the hydrophobic dissolved oxygen amount target value DO of #1 high pressure heater shell side outlet, for example DO is 40ug/L;
(2) detect the one-level suction pressure, for example the one-level suction pressure is 6MPa, calculate the mass flow controller aperture according to one-level suction pressure and the hydrophobic dissolved oxygen amount target value of #1 high pressure heater shell side outlet: under the different hydrophobic dissolved oxygen amount target values, the dependency of one-level suction pressure and mass flow controller aperture is:
When target value DO=60ug/L, KD=1.54MPa
-1Pressure-2.28
When target value DO=50ug/L, KD=1.28MPa
-1Pressure-1.90
When target value DO=40ug/L, KD=1.03MPa
-1Pressure-1.52
When target value DO=30ug/L, KD=0.77MPa
-1Pressure-1.14
When target value DO=20ug/L, KD=0.51MPa
-1Pressure-0.76
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＝0.151L/hKD+0.625L/h(0≤KD≤100，％)
Wherein: DO is the hydrophobic dissolved oxygen amount target value of #1 high pressure heater shell side outlet, μ g/L; KD is the mass flow controller aperture, %; Pressure is the one-level suction pressure, MPa; FLOW
O2For adding oxygen flow, L/h.
In the step (1), in order to control ORP in the reasonable scope automatically, control Fe concentration is set the higher limit ORP that #1 high pressure heater shell side exports hydrophobic redox potential in low scope
1(higher limit can be selected a numerical value among the 180-200 μ g/L, specifically can determine according to real system), and the lower value ORP of redox potential
2(lower value can be selected a numerical value among the 80-100 μ g/L, specifically can determine according to real system): hydrophobic ORP reaches higher limit ORP when the outlet of the #3 of actual detected high pressure heater shell side
1The time, automatic control program is adjusted the hydrophobic dissolved oxygen amount target value (the dissolved oxygen target value is reduced 5 μ g/L) of #1 high pressure heater shell side outlet automatically according to the size of the hydrophobic ORP of the #3 high pressure heater shell side outlet of actual detected, program is in time adjusted the mass flow controller aperture then automatically, adjust oxygen-adding amount, make the hydrophobic dissolved oxygen amount target value of hydrophobic oxyty of #1 high pressure heater shell side outlet and the outlet of #1 high pressure heater shell side consistent.Hydrophobic ORP reaches lower value ORP when the outlet of the #3 of actual detected high pressure heater shell side
2The time, automatic control program is adjusted the hydrophobic dissolved oxygen amount target value (the dissolved oxygen target value raises 5 μ g/L) of #3 high pressure heater shell side outlet automatically according to the size of the hydrophobic ORP of the #3 high pressure heater shell side outlet of actual detected, program is in time adjusted the mass flow controller aperture then automatically, adjust oxygen-adding amount, make #1 high pressure heater shell side outlet oxyty consistent with target value.Work as ORP
2＜ORP＜ORP
1The time, enter step (2) according to the hydrophobic dissolved oxygen amount target value of predefined #1 high pressure heater shell side outlet.
When unit load changed, corresponding variation can appear in the one-level suction pressure, this moment automatically the oxygenation Controlling System can be automatically according to the aperture of the size adjustment mass flow controller of one-level suction pressure, guarantees the accuracy and the stability of hydrophobic middle dissolved oxygen; When if the hydrophobic dissolved oxygen amount target value of dissolved oxygen amount that real-time detection practical # 1 high pressure heater shell side outlet this moment is hydrophobic and the outlet of predefined # 1 high pressure heater shell side has deviation, proportion of utilization-integration-differential control (PID bias adjustment), operation is finely tuned to oxygenation, and the dissolved oxygen amount target value hydrophobic until the measured value and the predefined # 1 high pressure heater shell side outlet of the hydrophobic dissolved oxygen amount of #1 high pressure heater shell side outlet is consistent; The setting of parameter can be determined according to the actual motion system in the PID bias adjustment process.
Under the water quality deterioration situation, for preventing oxygenation system is caused damage, the hydrogen electricity is set, and to lead the upper limit alarm method as follows:
The hydrophobic hydrogen electricity of #1 high pressure heater shell side outlet is set leads higher limit (higher limit can be chosen the numerical value of 0.15-0.20 μ s/cm, determine according to practical situation), the hydrophobic hydrogen electricity of #3 high pressure heater shell side outlet is set leads higher limit (higher limit can be chosen the numerical value of 0.15-0.20 μ s/cm, determine according to practical situation), the hydrogen electricity of steam separator outlet water sample is led higher limit, and (higher limit can be chosen the numerical value of 0.15-0.20 μ s/cm, determine according to practical situation) and the hydrogen electricity of finishing superheater outlet water sample is led higher limit, and (higher limit can be chosen the numerical value of 0.15-0.20 μ s/cm, determine according to practical situation), when the outlet of #1 high pressure heater shell side, the outlet of #3 high pressure heater shell side, the hydrogen electricity that steam separator outlet and finishing superheater export is led in the table hydrogen electric conductivity value that records of any two tables when reaching its corresponding higher limit, the PLC system sends audio alarm, automatically the oxygenation system in time adjusts the oxygenation strategy according to water quality: when any two hydrogen electricity dodar during to higher limit, Controlling System stops oxygenation, treat that quality recovery is normal, it is the outlet of #1 high pressure heater shell side, the outlet of #3 high pressure heater shell side, water separator outlet and finishing superheater outlet hydrogen electricity are led any two tables record in the table hydrogen electric conductivity value when having at least three values to be lower than higher limit, 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.
For preventing hypotony or too high disadvantageous effect to the oxygenation operation, to electro connecting pressure gauge setting pressure scope (specifically deciding) according to system device, when hydrophobic aeration device line pressure is excessive or too small, the PLC system sends audio alarm, in time adjust pressure and meet oxygenation control requirement: when pressure is excessive, Controlling System is adjusted pressure to the control requirement, guarantees that oxygenation carries out smoothly; When pressure was too small, Controlling System was adjusted pressure to controlling requirement, if pressure is still too small after adjusting, then needs manually to change oxygen bottle, guaranteed that oxygenation carries out smoothly.Source of oxygen is generally selected oxygen cylinder for use, if oxygen cylinder pressure is less than adding the pressure that oxygen point place one-level is bled, the oxygenation operation can't be carried out smoothly, need to change oxygen cylinder.For avoiding frequently changing oxygen cylinder, general gas boosting pump, surge tank and the reducing valve of on the pipeline between electro connecting pressure gauge and the flow director, contacting and being provided with successively; The oxygen cylinder exit end is communicated with the gas boosting pump intake by pipeline, pipeline between the two is provided with electro connecting pressure gauge, the gas boosting pump discharge is communicated with the surge tank inlet by pipeline, pipeline between surge tank outlet and the mass flow controller is provided with above-mentioned reducing valve, and the gas boosting pump is controlled by PLC.For example, the gas boosting pump is driven by pressurized air, and required compressed air pressure is 0.6-0.7MPa.In actual moving process,, guarantee that gas boosting pump discharge oxygen pressure is stabilized in 12.0-13.0MPa (surplus than one-level suction pressure 6MPa exceeds 4-5MPa guarantees hydrophobic oxygenation stable operation operation) by the PLC parameter setting.When oxygen bottle exported oxygen pressure greater than 12MPa, the gas boosting pump was the path pipeline, and oxygen directly passes through, and controlled stable gas pressure at 10.0-11.5MPa through reducing valve; When steel cylinder outlet oxygen pressure is lower than 12MPa, the gas boosting pump is a supercharging device, oxygen after the supercharging of gas boosting pump through a surge tank, the pressure all-the-time stable maintains 12.0-13.0MPa, control stable gas pressure at 10.0-11.5MPa through reducing valve again, adjust by mass flow controller then, realize adding the control of oxygen point oxygenation flow by flow director.
Enter 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 set #1 high pressure heater shell side outlet water sample dissolved oxygen amount higher limit, can determine according to concrete system), (concrete higher limit can be selected among the 50-80 μ g/L to #3 high pressure heater shell side outlet water sample dissolved oxygen amount higher limit, can determine according to concrete system), (concrete higher limit can be selected among the 3-10 μ g/L to steam separator outlet water sample dissolved oxygen amount higher limit, can determine according to concrete system) and finishing superheater exports water sample dissolved oxygen amount higher limit, and (concrete higher limit can be selected among the 50-80 μ g/L, can determine according to concrete system), when #1 high pressure heater shell side outlet water sample, the outlet of #3 high pressure heater shell side, the water sample dissolved oxygen value that any one table instrumentation gets in steam separator outlet and the finishing superheater outlet dissolved oxygen table reaches in limited time, and PLC sends audio alarm; In time adjust mass flow controller automatically to minimum aperture (0%-10% according to the oxyty program simultaneously, specifically establish according to plant and instrument), when exporting, #1 high pressure heater shell side moves the original oxygen flow that adds automatically after water sample, the outlet of #3 high pressure heater shell side, steam separator outlet and finishing superheater outlet dissolved oxygen index reach requirement.
Because what of hydrophobic dissolved oxygen content, influence the structure and the form of oxide film 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.Intelligence is the oxygenation control techniques automatically, and stablizing of the 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 hydrophobic required stable oxygen-adding amount according to reality.
Claims (4)
1. a full-automatic heater condensate oxygenation method is characterized in that, comprising:
(1) preestablishes the hydrophobic dissolved oxygen amount target value DO of #1 high pressure heater shell side outlet;
Set the higher limit ORP1 of the hydrophobic redox potential of #3 high pressure heater shell side outlet;
Set the lower value ORP2 of the hydrophobic redox potential of #3 high pressure heater shell side outlet;
Detect the hydrophobic redox potential ORP of #3 high pressure heater shell side outlet then, and the hydrophobic dissolved oxygen amount target value DO of predefined #1 high pressure heater shell side outlet carried out following adjustment:
(i) when ORP2＜ORP＜ORP1, hydrophobic dissolved oxygen amount target value DO enters step (2) according to predefined #1 high pressure heater shell side outlet;
(ii) when ORP 〉=ORP1, reduce the hydrophobic dissolved oxygen amount target value DO of #1 high pressure heater shell side outlet,, get back to step (i) until ORP2＜ORP＜ORP1;
(iii) when ORP≤ORP2, increase the hydrophobic dissolved oxygen amount target value DO of #1 high pressure heater shell side outlet,, get back to step (i) until ORP2＜ORP＜ORP1;
(2) detect the pressure that #1 high pressure heater shell side ingress one-level is bled, the hydrophobic dissolved oxygen amount target value DO of predefined #1 high pressure heater shell side outlet that finally obtains according to one-level suction pressure and step (1) calculates the hydrophobic oxygen flow that adds that adds oxygen point;
The described hydrophobic pass that adds between oxygen flow and the one-level suction pressure that adds oxygen point is:
FLOW
O2=0.151L/h×(k×Pressure+b)+0.625L/h
Wherein, FLOW
O2Be the hydrophobic oxygen flow that adds that adds oxygen point, L/h; Pressure is the one-level suction pressure, MPa; K is a relation conefficient, MPa
-1B is a relation conefficient, and k and b are determined by the hydrophobic dissolved oxygen amount target value DO of predefined #1 high pressure heater shell side outlet;
(3) according to the oxygen flow that adds that calculates the hydrophobic oxygen point that adds is carried out the oxygenation operation.
2. full-automatic heater condensate oxygenation method according to claim 1 is characterized in that,
Described step also comprises the steps: in (1)
(I) set the hydrogen electricity and lead higher limit H
The upper limit
(II) gather the hydrogen electricity derivative certificate of different check points in real time, constitute the hydrogen electricity and lead the detection data acquisition, this set comprises following element: the hydrogen electricity of finishing superheater outlet water sample is led H
a, the hydrophobic hydrogen electricity of #1 high pressure heater shell side outlet leads H
bLead H with the hydrophobic hydrogen electricity of #3 high pressure heater shell side outlet
c
(III) lead element and the H that detects in the data acquisition and with the hydrogen electricity
The upper limitContrast, do following processing then:
If the hydrogen electricity is led the value of any two elements in the detection data acquisition all greater than H
The upper limitThe time, report to the police, stop the oxygenation operation simultaneously, at least one is less than H in described two elements
The upper limit, the hydrophobic oxygen flow that adds that adds oxygen point in the recovering step (2).
3. full-automatic heater condensate oxygenation method according to claim 1 is characterized in that described step also comprises the steps: in (1)
(I) set different check point dissolved oxygen amount higher limits, constitute the set of dissolved oxygen amount higher limit, comprise following element in this set: dissolved oxygen amount higher limit, the #1 high pressure heater shell side of finishing superheater outlet water sample exports hydrophobic dissolved oxygen amount higher limit, #3 high pressure heater shell side exports hydrophobic dissolved oxygen amount higher limit;
(II) dissolved oxygen amount of gathering different check points in real time detects data, constitute dissolved oxygen amount and detect data acquisition, this set comprises following element: the dissolved oxygen amount of finishing superheater outlet water sample, the dissolved oxygen amount of #1 high pressure heater shell side outlet and the hydrophobic dissolved oxygen amount of #3 high pressure heater shell side outlet;
(III) element that dissolved oxygen amount is detected data acquisition is done following processing: the value that detects any one element in the data acquisition when dissolved oxygen amount greater than it in the set of dissolved oxygen amount higher limit during corresponding higher limit, report to the police, turn the hydrophobic oxygen flow that adds that adds oxygen point simultaneously down, until the value of this element less than its corresponding higher limit in the set of dissolved oxygen amount higher limit, the hydrophobic oxygen flow that adds that adds oxygen point in the recovering step (2).
4. full-automatic heater condensate oxygenation method according to claim 3 is characterized in that, also comprises the higher limit of the dissolved oxygen amount of steam separator outlet water sample in the described dissolved oxygen amount higher limit set; Described dissolved oxygen amount detects the dissolved oxygen amount that also comprises steam separator outlet water sample in the data acquisition.
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| CN101423282A (en) * | 2008-12-01 | 2009-05-06 | 河南电力试验研究院 | Station boiler and water and oxygen supply apparatus and method thereof |
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| CN101423282A (en) * | 2008-12-01 | 2009-05-06 | 河南电力试验研究院 | Station boiler and water and oxygen supply apparatus and method thereof |
| CN101851020A (en) * | 2010-04-29 | 2010-10-06 | 浙江省电力试验研究院 | DC boiler feed water selective oxidation treatment process |
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