CN202671237U - Drain oxygenation device of full-automatic heater - Google Patents
Drain oxygenation device of full-automatic heater Download PDFInfo
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- CN202671237U CN202671237U CN 201220314616 CN201220314616U CN202671237U CN 202671237 U CN202671237 U CN 202671237U CN 201220314616 CN201220314616 CN 201220314616 CN 201220314616 U CN201220314616 U CN 201220314616U CN 202671237 U CN202671237 U CN 202671237U
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Abstract
The utility model discloses a drain oxygenation device of a full-automatic heater. The drain oxygenation device comprises a programmable logic controller (PLC), a pressure detection device, a dissolved oxygen detection device, an oxidation reduction potential detection device, a hydrogen conductivity detection device and a flow controller, wherein the pressure detection device acquires a pressure signal of an oxygenation point on a pipeline and transmits the pressure signal to the PLC; the dissolved oxygen detection device acquires the dissolved oxygen of a detection point and transmits a dissolved oxygen signal to the PLC; the oxidation reduction potential detection device acquires an oxidation reduction potential of the detection point and transmits an oxidation reduction potential signal to the PLC; the hydrogen conductivity detection device acquires the hydrogen conductivity of the detection point and transmits a hydrogen conductivity signal to the PLC; and the flow controller is connected with an oxygen source and controls the oxygenation flow of a drain oxygenation point according to a PLC command. After the oxygenation device of the utility mode is adopted, a drain valve on the pipeline of a shell side of a high pressure heater is prevented from being blocked, and a unit is kept operating safely and economically under an oxygenation treatment (OT) working condition.
Description
Technical field
The utility model belongs to electric power and power engineering control techniques field, specifically relates to the hydrophobic aeration device of a kind of Full-automatic heater.
Background technology
The structure of existing super (super-) critical thermal power generation unit one through boiler Water, steam circulation 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 the heating surface such as three－stagesuperheater 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 again heated up 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, then the condensed water of in condenser hotwell, converging, hydrophobic and extraneous supplementary feed is sent to precision processing device of condensation water through condensate pump, gland heater, enter deoxygenator behind the low pressure heater, again rely on the power of service pump to carry out next one circulation.
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 with hydrophobic form, and mix with wherein feedwater and to carry out follow-up circulation.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 series winding arranges, and every grade of high pressure heater can be comprised of single high pressure heater or the many groups that are arranged in parallel high pressure heater.
The particular procedure technique of high pressure heater draining system causes the mobile accelerated corrosion (FAC) of this system; this corrosion (reductibility is processed and full volatilization is processed) under specific steam temperature range, high flow rate, specific chemical working condition occurs; 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 of hydrophobic middle iron high, 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 such as high pressure heater drain valve (being equipped with drain valve at #1 high pressure heater, #2 high pressure heater and the outlet of #3 high pressure heater shell side), Desuperheating water regulating valve, sampling valve etc., the adjusting function of unit is impacted.
It mainly is to process for the oxygenation that feeds water that present oxygenation is processed, and the relevant report of processing for 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 utility model, will have far-reaching economic benefit and social benefit.
The utility model content
The utility model provides a kind of Full-automatic heater hydrophobic aeration device; avoid hydrophobic periodicity to the high pressure heater drain valve to stop up; and this device can be realized the full automatic control of oxygenation; sampling point is arranged comprehensive and reasonable; the oxygenation Flow-rate adjustment is sensitive, control is convenient, and dissolved oxygen and the control of redox potential target value are stable, and is provided with and reports to the police and defence program; need not manual intervention, safety economy.
The hydrophobic aeration device of a kind of Full-automatic heater comprises:
PLC；
Pressure-detecting device gathers 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 to flow director, realized adding the control of oxygen point oxygenation flow by flow director.
By can understanding the content of hydrophobic middle oxygen to the detection of dissolved oxygen amount, and then need can to determine the flow of the oxygen that adds; By the 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 to the influence degree of corrosion of piping, oxygen-adding amount be carried out limit control.By dissolved oxygen amount, hydrogen electricity being led the control with the system of redox potential, when guaranteeing that tube wall forms fine and close ferric oxide protective membrane, reduce as far as possible the corrosion that too much oxygen causes pipeline.
Well heater of the present utility model 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 Water, steam circulation system; The shell side of three high pressure heaters is successively series connection 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 entrance of each high pressure heater 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 of bleeding from steam turbine one-level out.
For ease of control, described flow director is 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 the flux values of check point and also can detect information transmission to PLC, can control adding oxygen flow according to the feedback command of PLC simultaneously, improved the stability of oxygenation flow control.
Another kind of preferred 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 according to system device) in electro connecting pressure gauge, 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 after adjusting, and guarantees that oxygenation carries out smoothly.
For guaranteeing carrying out smoothly of aeration device oxygenation operation, the pressure of oxygen need to 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 source of oxygen of pressure steel cylinder, further preferred 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 series winding successively arranges; 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, according to the bleed peak pressure of operation of one-level, set the pressure threshold of gas boosting pump, the peak pressure that pressure threshold is generally bled greater than one-level by PLC; 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, then carries out the oxygenation operation through reducing valve control stable gas pressure; 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 source of oxygen oxygen is out carried out first supercharging, and the oxygen after the supercharging enters in the surge tank, in the scope of setting, then carry out the oxygenation operation through reducing valve control stable gas pressure.The pressure-stabilisation that the assurance system is set of surge tank is avoided the change of pressure and is opened frequently the gas boosting pump and carry out the supercharging operation, has improved the work-ing life of gas boosting pump, has guaranteed simultaneously stable the carrying out of oxygenation operation.
Respectively take above-mentioned three kinds of technical schemes as the basis, form three kinds of further preferred schemes, wherein said mass flow controller with add pipeline between the oxygen point and be provided with two pipelines in parallel, wherein be in series with first flow meter and the first variable valve of controlling the first flow meter, the second variable valve that is in series with the second under meter on another pipeline and controls the second under meter on a pipeline.Described first flow is counted large oxygen flow meter, and the first variable valve is large flux control valve; Described the second flow is counted little oxygen flow meter, and the second variable valve is control valve for small flows.Big or small oxygen flow meter is set, has made things convenient for 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 utility model 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 preferred technical scheme is: described dissolved oxygen amount proofing unit comprises some detection heads, and some 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 and finishing superheater outlet; Described hydrogen conductive detection device comprises some detection heads, and some detection heads are 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 some detection heads, and some 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.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 automatically regulate protection control simultaneously, at this moment, need to detect the hydrophobic dissolved oxygen amount of #3 high pressure heater shell side outlet; In 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 automatically regulate controlling alarm, at this moment, needing to detect the hydrogen electricity that finishing superheater exports, #1 high pressure heater shell side exports, #3 high pressure heater shell side exports water sample leads.Simultaneously, for preventing that owing to hot environment the tube wall of joining to low temperature superheater, pendant superheater, finishing superheater and final reheater that too much adds of oxygen causes negative impact, 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 simultaneously dissolved oxygen amount and the hydrogen electricity of steam separator outlet and finishing superheater outlet leads, low temperature superheater, pendant superheater and finishing superheater are carried out double-ended control, further reduced because adding hyperoxia and caused negative impact to low temperature superheater, pendant superheater and finishing superheater.
Described PLC is with warning device.The setting of warning device, so that when hydrophobic middle water quality deterioration, too much dissolved oxygen enters finishing superheater or line pressure when excessive or too small, PLC can remind the field personnel to check in the self-adjusting while, has greatly improved the safety and stability of pipeline circulation.
When utilizing the hydrophobic aeration device of the utility model Full-automatic heater that heater condensate is carried out oxygenation control, regulate accurately, can change timely and effective adjustment oxygen-adding amount according to unit load, steadily control 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.
Detailed process comprises:
(1) presets 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;
Then detect the hydrophobic redox potential ORP of #3 high pressure heater shell side outlet, 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, until ORP2＜ORP＜ORP1 gets back to step (i);
(iii) when ORP≤ORP2, increase the hydrophobic dissolved oxygen amount target value DO of #1 high pressure heater shell side outlet, until ORP2＜ORP＜ORP1 gets back to step (i);
(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 relation conefficient, MPa
-1B is 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 the 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), oxygenation operation is finely tuned, until that the measured value of the hydrophobic dissolved oxygen amount of #1 high pressure heater shell side outlet and predefined # 1 high pressure heater shell side export hydrophobic dissolved oxygen amount target value DO is consistent.
Because recycling of carbonated drink, because of the metal of corrosion dissolution resistance ion 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 preferred technical scheme is: set simultaneously the hydrogen electricity and lead higher limit H in step (1)
The upper limitThe hydrogen electricity derivative certificate of the different check points of Real-time Collection consists of the hydrogen electricity and leads the detection data acquisition, and 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
On LimitThen contrast does following processing: 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 simultaneously oxygenation operation, until in above-mentioned two elements at least one less than H
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 preferred 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 processed, 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 from stopping up drain valve on the one hand; On the other hand, should prevent because hot environment, the tube wall of joining to low temperature superheater, pendant superheater, finishing superheater and final reheater that too much adds of oxygen causes negative impact, so a kind of preferred technical scheme is: in step (1), set simultaneously different check point dissolved oxygen amount higher limits, consist of 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; Then the dissolved oxygen amount of the different check points of Real-time Collection detects data, consist of 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; The data that dissolved oxygen amount detected data acquisition are handled as follows: 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 simultaneously the hydrophobic oxygen flow that adds that adds oxygen point down, until the value of this element is less than its higher limit corresponding in dissolved oxygen amount higher limit set, the hydrophobic oxygen flow that adds in the recovering step (2).
For further reducing because hot environment, the tube wall of joining to low temperature superheater, pendant superheater, finishing superheater and final reheater that too much adds of oxygen causes negative impact, as further preferred 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 utility model suppresses FAC in 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.
The hydrophobic aeration device of Full-automatic heater of the present utility model; this device can be realized the full automatic control of oxygenation; sampling point is arranged comprehensive and reasonable; adopt automatically oxygenation control techniques of intelligence; the oxygenation Flow-rate adjustment is sensitive, control is convenient, and dissolved oxygen and the control of redox potential target value are stable, and is provided with and reports to the police and defence program; need not manual intervention, safety economy.
The utility model adopts hydrophobic oxygenation to process (OT) mode, by full intelligent control oxygenation technology, carry out micro-oxygenation take the one-level suction pressure as the auxiliary proportional-integral-differential control of feedforward (PID bias adjustment) to hydrophobic, and then the Structure and form of change steam contact interface oxide film, make more firm compact of oxide film, alleviate even stop the generation of draining system FAC, thereby solve the difficult problem of draining system current accelerated corrosion, in extension device work-ing life, energy-saving and cost-reducing, improve the economic and social benefits.
The utility model adopts hydrophobic aeration device in the full intelligent control thermal power plant large Capacity Supercritical unit high pressure heater shell side, is avoiding full volatilization to process 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 processed is more targeted, can be directedly solved the 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 utility model, the long-term normal operation of high pressure heater drain valve.
3, under traditional AVT operating mode, hydrophobic Fe concentration is larger; Under OT operating mode of the present utility model, along with the rising of hydrophobic redox potential (ORP), Fe concentration obviously descends.
4, adopt automatically oxygenation control techniques of intelligence, and suction pressure is the auxiliary proportional-integral-differential control of feedforward (PID bias adjustment), carry out micro-oxygenation to hydrophobic, 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 boiler operatiopn system diagram in the prior art;
Fig. 2 be the hydrophobic aeration device of the utility model Full-automatic heater add oxygen point and check point distribution plan;
Fig. 3 is the theory structure synoptic diagram of the hydrophobic aeration device of the utility model Full-automatic heater.
Embodiment
The below is described further the hydrophobic aeration device of Full-automatic heater of the present utility model and method take existing feedwater steam circulation system as example:
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 successively series connection 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 respectively #1 high pressure heater, #2 high pressure heater and #3 high pressure heater of bleeding to transfer to hydrophobic, hydrophobic step by step gravity flow 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 for one-level, enter bleeding of #2 high pressure heater shell side and bleed for secondary, enter bleeding of #3 high pressure heater shell side and be three grades and bleed.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 the normal drain regulating valve of #1 high pressure heater and the normal drain regulating valve of #3 high pressure heater place.
Be the hydrophobic aeration device of Full-automatic heater of the present utility model such as Fig. 3, comprise: 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, the first variable valve 8, the second under meter 9, the second variable valve 10 and PLC.
The pressure that pressure-detecting device 1 is bled for detection of one-level in the high pressure heater shell side inlet ductwork also is transferred to PLC with one-level suction pressure signal; Dissolved oxygen amount proofing unit 2 can be selected conventional dissolved oxygen table, 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 mass flow controller, its flow signal output terminal links to each other with the PLC input terminus, be used for the oxygen flow that adds of continuous online acquisition oxygen pipeline, simultaneously the oxygenation flow signal that detects exported to PLC, then control adding oxygen flow according to the PLC feedback command.
Mass flow controller and the hydrophobic pipeline that adds between the oxygen point are provided with two pipelines in parallel, wherein be in series with first flow meter 7 and the first variable valve 8 of controlling first flow meter 7, the second variable valve 10 that is in series with the second under meter 9 on another pipeline and controls the second under meter 9 on a pipeline.First flow meter 7, the second under meter 9 all can be selected common multiple gases under meter, and first flow meter 7 is large oxygen flow meter, the second under meter 9 is little oxygen flow meter, be used for Site Detection and add oxygen flow, when adding oxygen flow when larger, enable large oxygen flow meter, add oxygen flow hour, start little oxygen flow meter, be convenient to the field staff and observe and reading; The first variable valve 8 and the second variable valve 10 are respectively applied to control first flow meter 7 and the 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, for detection of the outlet of #1 high pressure heater shell side, the outlet of #3 high pressure heater shell side is hydrophobic and steam separator outlet and finishing superheater outlet water sample in dissolved oxygen amount.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, and are hydrophobic for detection of the outlet of #1 high pressure heater shell side, the outlet of #3 high pressure heater shell side is hydrophobic, the hydrogen electricity in steam separator and the finishing superheater outlet water sample is led.The redox potential proofing unit is provided with 2 detection heads, be located at respectively on the pipeline of #1 high pressure heater shell side outlet, the outlet of #3 high pressure heater shell side, export redox potential in hydrophobic for detection of the outlet of #1 high pressure heater shell side and #3 high pressure heater shell side.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 arrange.
PLC is provided with audio alarm, when detecting the control parameter, PLC occurs when unusual, and the PLC automatic alarm, and take 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) preset 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
Then can obtain adding oxygen flow according to the mass flow controller aperture, the mass flow controller aperture with the dependency that adds oxygen flow is:
FLOW
O2＝0.151L/h?KD+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 automatically to control ORP in the reasonable scope, control Fe concentration is set the higher limit ORP of the hydrophobic redox potential of #1 high pressure heater shell side outlet 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): the hydrophobic ORP of #3 high pressure heater shell side outlet that detects when reality reaches higher limit ORP
1The time, the size of the ORP that the #3 high pressure heater shell side outlet that automatic control program detects according to reality is hydrophobic 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, 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 the hydrophobic oxyty of #1 high pressure heater shell side outlet and the outlet of #1 high pressure heater shell side consistent.The hydrophobic ORP of #3 high pressure heater shell side outlet that detects when reality reaches lower value ORP
2The time, the size of the ORP that the #3 high pressure heater shell side outlet that automatic control program detects according to reality is hydrophobic 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, 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, guarantee accuracy and the stability of hydrophobic middle dissolved oxygen; When if the hydrophobic dissolved oxygen amount target value of the 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), oxygenation operation is finely tuned, until that the measured value of the hydrophobic dissolved oxygen amount of #1 high pressure heater shell side outlet and predefined # 1 high pressure heater shell side export hydrophobic dissolved oxygen amount target value is consistent; The setting of parameter can be determined according to the actual motion system in the PID bias adjustment process.
In 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 of steam separator outlet and finishing superheater outlet is led when the hydrogen electric conductivity value that records of any two tables reaches its corresponding higher limit in the table, 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 originally to add oxygen flow.In this control method, select just to control in limited time to upper when any two hydrogen electricity dodar, mainly be to lead table itself when breaking down for preventing when some hydrogen wherein, 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, guarantees that oxygenation carries out smoothly.Source of oxygen is generally selected oxygen cylinder, if oxygen cylinder pressure less than the pressure that adds oxygen point place one-level and bleed, the oxygenation operation can't be carried out smoothly, need to change oxygen cylinder.For avoiding the frequent 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 arranging 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 entrance 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, by the PLC parameter setting, 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).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 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, then adjust by mass flow controller, realized 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 automatically adjust mass flow controller 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 automatically moves the original oxygen flow that adds 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, affect on the one hand the Structure and form of oxide film, the production rate of control oxide film; Affect on the other hand service life of equipment, systematic economy safe operation, therefore when unit load changed, it was most important stably to control oxygen-adding amount.The automatic oxygenation control techniques of intelligence, the stable of flow director import and export pressure of ensuring the quality of products on the one hand, Reduce variation; Can automatically regulate on the other hand and add oxygen flow and carry out flow feedback, guarantee hydrophobic required stable oxygen-adding amount according to actual requirement.
Claims (8)
1. the hydrophobic aeration device of Full-automatic heater is characterized in that, comprising:
PLC；
Pressure-detecting device gathers 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.
2. the hydrophobic aeration device of Full-automatic heater according to claim 1 is characterized in that, described flow director is mass flow controller, and the flow signal output terminal of mass flow controller links to each other with the PLC input terminus.
3. the hydrophobic aeration device of Full-automatic heater 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. the hydrophobic aeration device of Full-automatic heater according to claim 3 is characterized in that, 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 of successively series winding setting; 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.
5. the hydrophobic aeration device of the described Full-automatic heater of arbitrary claim according to claim 2-4, it is characterized in that, described mass flow controller with add pipeline between the oxygen point and be provided with two pipelines in parallel, wherein be in series with first flow meter and the first variable valve of controlling the first flow meter, the second variable valve that is in series with the second under meter on another pipeline and controls the second under meter on a pipeline.
6. the hydrophobic aeration device of Full-automatic heater according to claim 1, it is characterized in that, described dissolved oxygen amount proofing unit comprises some detection heads, and some 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 and finishing superheater outlet; Described hydrogen conductive detection device comprises some detection heads, and some detection heads are 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 some detection heads, and some 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.
7. the hydrophobic aeration device of Full-automatic heater according to claim 6 is characterized in that, 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.
8. the hydrophobic aeration device of Full-automatic heater according to claim 1 is characterized in that, described PLC is with warning device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220314616 CN202671237U (en) | 2012-06-28 | 2012-06-28 | Drain oxygenation device of full-automatic heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220314616 CN202671237U (en) | 2012-06-28 | 2012-06-28 | Drain oxygenation device of full-automatic heater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202671237U true CN202671237U (en) | 2013-01-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220314616 Expired - Lifetime CN202671237U (en) | 2012-06-28 | 2012-06-28 | Drain oxygenation device of full-automatic heater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202671237U (en) |
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2012
- 2012-06-28 CN CN 201220314616 patent/CN202671237U/en not_active Expired - Lifetime
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Address after: 310003 Hangzhou City, Fung Fung Road, No. Guoxin real estate building, building 15, building 108 Patentee after: ZHEJIANG ENERGY R & D INSTITUTE Co.,Ltd. Address before: Hangzhou City, Zhejiang province 310052 Binjiang District Binsheng Road No. 1751 building second zheneng Patentee before: Zhejiang Zheneng Energy Technology Co.,Ltd. |
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