CN111348759A - High-pressure-rise hydrophobic automatic oxygenation system and oxygenation method - Google Patents
High-pressure-rise hydrophobic automatic oxygenation system and oxygenation method Download PDFInfo
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- CN111348759A CN111348759A CN202010264846.1A CN202010264846A CN111348759A CN 111348759 A CN111348759 A CN 111348759A CN 202010264846 A CN202010264846 A CN 202010264846A CN 111348759 A CN111348759 A CN 111348759A
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- 238000006213 oxygenation reaction Methods 0.000 title claims abstract description 236
- 238000000034 method Methods 0.000 title claims abstract description 12
- 230000002209 hydrophobic effect Effects 0.000 title claims description 47
- 239000001301 oxygen Substances 0.000 claims abstract description 189
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 188
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 182
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 170
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 148
- 230000001105 regulatory effect Effects 0.000 claims abstract description 52
- 239000007788 liquid Substances 0.000 claims description 66
- 238000002360 preparation method Methods 0.000 claims description 33
- 230000003381 solubilizing effect Effects 0.000 claims description 30
- 238000002955 isolation Methods 0.000 claims description 26
- 239000003814 drug Substances 0.000 claims description 25
- 230000007928 solubilization Effects 0.000 claims description 25
- 238000005063 solubilization Methods 0.000 claims description 25
- 239000007789 gas Substances 0.000 claims description 19
- 239000000203 mixture Substances 0.000 claims description 14
- 230000007797 corrosion Effects 0.000 claims description 9
- 238000005260 corrosion Methods 0.000 claims description 9
- 230000000087 stabilizing effect Effects 0.000 claims description 7
- 230000001706 oxygenating effect Effects 0.000 claims description 3
- 239000003570 air Substances 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 150000002926 oxygen Chemical class 0.000 claims description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 3
- 238000004880 explosion Methods 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004069 differentiation Effects 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000003818 cinder Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- -1 oxygen saturated oxygen Chemical class 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000005514 two-phase flow Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/005—Processes using a programmable logic controller [PLC]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention discloses a high-pressure-plus-hydrophobicity automatic oxygenation system and an oxygenation method, wherein the oxygenation system comprises a gaseous high-pressure-plus-hydrophobicity oxygenation system, an oxygen-enriched water high-pressure-plus-hydrophobicity oxygenation system, a hydrogen peroxide high-pressure-plus-hydrophobicity oxygenation system and a PLC (programmable logic controller) automatic oxygenation controller, an oxygenation medium of the gaseous high-pressure-plus-hydrophobicity oxygenation system is air, an oxygenation medium of the oxygen-enriched water high-pressure-plus-hydrophobicity oxygenation system is oxygen-enriched water, an oxygenation medium of the hydrogen peroxide high-pressure-plus-hydrophobicity oxygenation system is dilute hydrogen peroxide, and an alkalizer can be added into the high-pressure-plus-hydrophobicity oxygenation system by the hydrogen peroxide high-pressure-plus-hydrophobicity oxygenation system. The automatic oxygen adding controller of the PLC is used for carrying out feedforward PID adjustment on the oxygen adding electric regulating valve and the oxygen adding metering pump, so that the automatic and accurate control of the oxygen adding amount can be realized. Air or oxygen-enriched water or dilute hydrogen peroxide is used as an oxygenation medium, so that the safety problem of oxygenation of a high-pressure oxygenation drainage system under the conditions of high temperature and high pressure is solved.
Description
Technical Field
The invention relates to the technical field of water treatment in the power plant industry, in particular to a high-pressure-increasing hydrophobic automatic oxygenation system and an oxygenation method.
Background
The operation temperature of the high pressure heater drainage system is in a sensitive range (150-250 ℃) where the flow accelerated corrosion is most likely to occur, meanwhile, the high pressure heater drainage system is a vapor-liquid two-phase flow system, the vapor-liquid distribution coefficient of ammonia is large, most of hydrophobic ammonia is distributed in a vapor space, the pH value of drainage is obviously reduced, and therefore the corrosion of the high pressure heater drainage system is often serious.
The oxygenation treatment is the preferred water chemical treatment process for ensuring safe and economic operation of the supercritical (super) critical unit. The traditional high-oxygen treatment generally controls the oxygen content at the inlet of the economizer to be 50-150 mug/L, so that high-concentration oxygen exists in steam, and the corrosion protection problem of a water supply system and a high-pressure drainage system is comprehensively solved by passivating the high-pressure drainage system by the steam with oxygen. However, related studies indicate that oxygen in steam can promote Fe2O3The oxide layer is generated, and the cracking and the peeling of the oxide layer in the austenitic steel steam pipeline are accelerated. The problems of pipe blockage and pipe explosion of the superheater and the reheater caused by oxide skin cause oxygen to be added in many power plants and color change. The low-oxygen treatment is gradually accepted by more and more power plants, the oxygen content at the inlet of the economizer is generally controlled to be less than 30 mu g/L, the requirement of corrosion prevention and passivation of a water supply system is met, meanwhile, the oxygen content of steam after oxygen addition is basically not increased compared with that before oxygen addition, and the potential risk of oxide skin during oxygen addition is effectively avoided. The deficiency of low oxygen treatment is that the steam entering the steam side of the high pressure heater is basically oxygen-free, and the corrosion problem of the high pressure heater and the high pressure heater cannot be solved.
In view of the problems of high-oxygen treatment and low-oxygen treatment of the feed water, the optimal oxygenation mode of the supercritical (super) unit is a full-protection oxygenation mode of' low-oxygen treatment of the feed water + single-oxygenation treatment of high-pressure plus water, the problem of flow accelerated corrosion of the high-pressure plus water drainage system under the condition of low-oxygen treatment of the feed water is thoroughly solved by independently oxygenating the high-pressure plus water drainage system, and the problems of pipe blockage and pipe explosion of a steam pipeline are solved at the same time.
The high-pressure water-adding and draining oxygenation point has high-temperature and high-pressure characteristics, for a supercritical (super) critical unit, the pressure of the high-pressure water-adding and draining oxygenation point is usually close to 10MPa, the pressure of oxygen adding and air supplying is usually more than 10MPa, the regulation of GB 169912-2016 technical Specification for oxygen and related gas safety regulations, the pure oxygen pressure is more than 3MPa, the pure oxygen is not allowed to be conveyed by using a carbon steel pipe, and when the oxygen pressure is more than 10MPa, a copper and copper alloy pipeline is adopted, so that the high-pressure water-adding and draining oxygenation cannot use pure oxygen as. Under the working condition, air or oxygen-enriched water or dilute hydrogen peroxide is used as a high-pressure hydrophobic oxygenation medium, air is used as the oxygenation medium, when the pressure of oxygenation air supply is greater than 10MPa, the partial pressure of oxygen is less than 3MPa, and related safety requirements can be met. After the high pressure water-adding and drainage oxygen adding medium is determined, an automatic high pressure water-adding and drainage oxygen adding system and an oxygen adding method are needed, and safe oxygen adding of the high pressure water-adding and drainage system is achieved.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention aims to provide a high-pressure-increasing-drainage automatic oxygenation system and an oxygenation method, so that safe oxygenation of the high-pressure-increasing-drainage system is realized, the oxygenation system adopts air or oxygen-enriched water or diluted hydrogen peroxide and/or an alkalizer as an oxygenation medium, and meanwhile, the arbitrary switching and combination of three oxygenation media and an oxygenation system can be realized, so that the requirements of a power plant and the conditions of an oxygenation site are met.
In order to achieve the purpose, the invention adopts the following technical scheme:
a high pressure heater drainage automatic oxygenation system comprises a gaseous high pressure heater drainage oxygenation system, an oxygen-enriched water high pressure heater drainage oxygenation system, a hydrogen peroxide high pressure heater drainage oxygenation system and a PLC (programmable logic controller) automatic oxygenation controller 11;
the gaseous high-pressure hydrophobic oxygenation system comprises a compressed air preparation system 19 connected with a high-pressure hydrophobic oxygenation point 8, and a pipeline connecting an outlet of the compressed air preparation system 19 and the high-pressure hydrophobic oxygenation point 8 is sequentially provided with a compressed air preparation system outlet valve 17, a gas pressure reducing valve 15, an oxygenation electric regulating valve front isolation valve 13, an oxygenation electric regulating valve 12, an oxygenation pressure stabilizing valve 10 and a gaseous oxygenation stop valve 9;
the oxygen-enriched water high-pressure-drainage oxygenation system comprises a demineralized water taking valve 1 and a compressed air preparation system 19 or an oxygen cylinder 18 which are connected with a high-pressure-drainage oxygenation point 8, wherein a liquid pressure reducing valve 2, a solubilizing device 3, an oxygenation metering pump 4, a pulse damper 5, a back pressure valve 6 and a liquid oxygenation stop valve 7 are sequentially arranged on a pipeline connecting the demineralized water taking valve 1 and the high-pressure-drainage oxygenation point 8; a pipeline connecting an outlet of the compressed air preparation system 19 and an inlet of the solubilizing device 3 is sequentially provided with an outlet valve 17 of the compressed air preparation system, a gas pressure reducing valve 15 and a front isolating valve 14 of the solubilizing device, and a pipeline connecting an outlet of the oxygen cylinder 18 and an inlet of the solubilizing device 3 is sequentially provided with an outlet valve 16 of the oxygen cylinder, the gas pressure reducing valve 15 and the front isolating valve 14 of the solubilizing device;
the hydrogen peroxide high-pressure-plus-drainage oxygenation system comprises a demineralized water intake valve 1 and a liquid medicine tank 22 which are connected with a high-pressure-plus-drainage oxygenation point 8, wherein a liquid pressure reducing valve 2, a solubilizing device 3, an oxygenation metering pump 4, a pulse damper 5, a back pressure valve 6 and a liquid oxygenation stop valve 7 are sequentially arranged on a pipeline connecting an outlet of the demineralized water intake valve 1 and the high-pressure-plus-drainage oxygenation point 8; a pipeline connecting the outlet of the liquid medicine box 22 and the inlet of the solubilizing device 3 is sequentially provided with a liquid medicine box metering pump 21 and a liquid medicine box metering pump outlet valve 20;
the oxygenation electric regulating valve 12 and the oxygenation metering pump 4 are connected with the PLC automatic oxygenation controller 11.
In the gaseous high-pressure hydrophobic oxygenation system, the oxygenation medium must be air, the air is decompressed to a preset value from a compressed air preparation system 19 through an outlet valve 17 of the compressed air preparation system to a gas pressure reducing valve 15, then the air passes through a front isolation valve 13 of an oxygenation electric regulating valve to an oxygenation electric regulating valve 12, the pressure of the compressed air at the outlet of the oxygenation electric regulating valve 12 is stabilized to the preset value by an oxygenation pressure stabilizing valve 10, the pressure difference between the inlet and the outlet of the oxygenation electric regulating valve 12 is constant, and the opening of the oxygenation electric regulating valve 12 is automatically adjusted by a PLC (programmable logic controller) automatic oxygenation controller 11 to control the oxygenation flow so as to realize the automatic and accurate control of the oxygenation.
In the oxygen-enriched water high-pressure hydrophobic oxygenation system, an oxygenation medium is oxygen-enriched water, and desalted water required by preparing the oxygen-enriched water is delivered to a solubilization device 3 from a desalted water taking valve 1 through a liquid pressure reducing valve 2; oxygen required for preparing the oxygen-enriched water is delivered to the solubilizing device 3 from the compressed air preparation system 19 through the outlet valve 17 of the compressed air preparation system, the gas pressure reducing valve 15 and the pre-solubilizing device isolation valve 14, or is delivered to the solubilizing device 3 from the oxygen cylinder 18 through the outlet valve 16 of the oxygen cylinder, the gas pressure reducing valve 15 and the pre-solubilizing device isolation valve 14; oxygen and demineralized water are fully mixed in the solubilizing device 3 to prepare oxygen saturated oxygen-enriched water under certain oxygen partial pressure, and the flow of the oxygen-enriched water is controlled by automatically adjusting the frequency of the oxygen metering pump 4 through the PLC (programmable logic controller) automatic oxygen adding controller 11 to realize automatic and accurate control of oxygen adding amount.
In the hydrogen peroxide high-pressure hydrophobic oxygenation system, a medium is dilute hydrogen peroxide and/or an alkalizer, wherein the dilute hydrogen peroxide is used as a high-pressure hydrophobic oxygenation medium, the alkalizer is used as a high-pressure hydrophobic dosing medium, and desalted water required for preparing the dilute hydrogen peroxide and/or strong alkaline water is delivered to a solubilization device 3 from a desalted water taking valve 1 through a liquid pressure reducing valve 2; hydrogen peroxide and/or alkalizer required for preparing dilute hydrogen peroxide and/or strong alkaline water are delivered to the solubilization device 3 from a liquid medicine box 22 through a liquid medicine box metering pump 21 and a liquid medicine box metering pump outlet valve 20; a certain amount of desalted water and a certain amount of hydrogen peroxide and/or alkalizer are fully mixed in the capacity increasing device 3 to prepare a mixture of dilute hydrogen peroxide or strong alkaline water or hydrogen peroxide and strong alkaline water with a certain concentration, and the flow of the dilute hydrogen peroxide or the strong alkaline water or the mixture of the hydrogen peroxide and the strong alkaline water is controlled by automatically adjusting the frequency of the oxygen adding metering pump 4 through the PLC (programmable logic controller) automatic oxygen adding controller 11 so as to realize the automatic and accurate control of the oxygen adding amount and the medicine adding amount.
When the gaseous high-pressure water and high-pressure water drainage oxygenation system or the oxygen-enriched water high-pressure water and high-pressure water drainage oxygenation system is started, the hydrogen peroxide high-pressure water and high-pressure water drainage oxygenation system can be started simultaneously, at the moment, only the alkalizer is added to the hydrogen peroxide high-pressure water and high-pressure water drainage oxygenation system, the alkalizer can assist in improving the pH value of high-pressure water and high-pressure water drainage, and corrosion of the high-pressure water drainage system is more favorably inhibited.
According to the oxygenation method of the high-pressure-plus-hydrophobicity automatic oxygenation system, the oxygenation medium with high-pressure-plus-hydrophobicity is air or oxygen-enriched water or dilute hydrogen peroxide, and the pH value of the high-pressure-plus-hydrophobicity can be increased by adding an alkalizer in an auxiliary manner during oxygenation;
when air is selected as a high-pressure-increased hydrophobic oxygenation medium, the demineralized water intake valve 1, the oxygen cylinder outlet valve 16, the solubilizing device front isolation valve 14 and the liquid oxygenation stop valve 7 are closed, the compressed air preparation system outlet valve 17, the oxygenation electric regulating valve front isolation valve 13, the oxygenation electric regulating valve 12 and the gaseous oxygenation stop valve 9 are opened, and the air sequentially passes through the compressed air preparation system outlet valve 17, the gas pressure reducing valve 15, the oxygenation electric regulating valve front isolation valve 13, the oxygenation electric regulating valve 12, the oxygenation pressure stabilizing valve 10 and the gaseous oxygenation stop valve 9 and is added into a high-pressure-increased hydrophobic oxygenation point 8; the opening of the oxygen adding electric regulating valve 12 is automatically regulated by the PLC automatic oxygen adding controller 11 to control the oxygen adding flow so as to realize the automatic and accurate control of the oxygen adding amount;
when oxygen-enriched water is selected as a high-pressure-increasing hydrophobic oxygenation medium, a front isolation valve 13 and a gaseous oxygenation stop valve 9 of an oxygenation electric regulating valve are closed, a demineralized water intake valve 1, an oxygen cylinder outlet valve 16 or a compressed air preparation system outlet valve 17, a solubilization device front isolation valve 14 and a liquid oxygenation stop valve 7 are opened, demineralized water and oxygen or air are fully mixed in a solubilization device 3 to prepare oxygen-enriched water, and the oxygen-enriched water sequentially passes through an oxygenation metering pump 4, a pulse damper 5, a back pressure valve 6 and the liquid oxygenation stop valve 7 and is added into a high-pressure-increasing hydrophobic oxygenation point 8; the flow of the oxygen-enriched water is controlled by automatically adjusting the frequency of the oxygen adding metering pump 4 through the PLC automatic oxygen adding controller 11 so as to realize the automatic and accurate control of the oxygen adding amount;
when dilute hydrogen peroxide is selected as a high-pressure hydrophobic oxygenation medium and/or an alkalizer is selected as a high-pressure hydrophobic dosing medium, closing a front isolation valve 14 and a gaseous oxygenation stop valve 9 of the solubilization device, opening a demineralized water intake valve 1, a liquid pressure reducing valve 2, a liquid medicine tank metering pump 21, a liquid medicine tank metering pump outlet valve 20 and a liquid oxygenation stop valve 7, fully mixing demineralized water and hydrogen peroxide and/or the alkalizer in a fixed ratio in a solubilization device 3 to prepare a mixture of dilute hydrogen peroxide or strong-alkaline water or hydrogen peroxide and strong-alkaline water, and sequentially passing the mixture of dilute hydrogen peroxide or strong-alkaline water or hydrogen peroxide and strong-alkaline water through an oxygenation metering pump 4, a pulse damper 5, a back pressure valve 6 and the liquid oxygenation stop valve 7 to be added into a high-pressure hydrophobic oxygenation point 8; the flow of dilute hydrogen peroxide or strong alkaline water or the mixture of the hydrogen peroxide and the strong alkaline water is controlled by automatically adjusting the frequency of the oxygen adding metering pump 4 through the PLC (programmable logic controller) automatic oxygen adding controller 11, so that the automatic accurate control of the oxygen adding amount and the chemical adding amount is realized.
The method for realizing the automatic accurate control of the oxygen addition amount is feedforward PID control;
when the highly water-adding and draining oxygenation medium is air, the adding amount of the air is in direct proportion to the valve opening of the oxygenation electric regulating valve 12, so that the adding amount of the air is represented by the opening of the oxygenation electric regulating valve 12, the unit load P is used as a feedforward signal, and the opening O of the oxygenation electric regulating valve 12 at the momentA1The set value D of the dissolved oxygen amount is equal to the unit load PO1In a certain condition, the ratio coefficient is set as KA，OA1＝KA×DO1× P, and simultaneously, collecting the real-time dissolved oxygen D of the feed waterO2And is combined with the dissolved oxygen set value DO1Comparing the measured values, performing PID (proportion integration differentiation) adjustment on the opening of the oxygen adding electric regulating valve 12 according to the deviation value of the dissolved oxygen amount to obtain a corrected valve opening OA2Thereby realizing the automatic and accurate control of the air adding amount;
when the high-pressure hydrophobic oxygenation medium is oxygen-enriched water or dilute hydrogen peroxide and/or an alkalizer, the adding amount of the oxygen-enriched water or dilute hydrogen peroxide and/or the alkalizer is in direct proportion to the frequency of the oxygenation metering pump 4, so that the adding amount of the oxygen-enriched water or dilute hydrogen peroxide and/or the alkalizer is represented by the frequency of the oxygenation metering pump 4, the unit load P is used as a feedforward signal, and the frequency F of the oxygenation metering pump 4 is used as a feedforward signalW1The set value D of the dissolved oxygen amount is equal to the unit load PO1In a certain condition, the ratio coefficient is set as KW，FW1＝KW×DO1× P, and simultaneously, collecting the real-time dissolved oxygen D of the feed waterO2And is combined with the dissolved oxygen set value DO1Comparing, PID adjusting the frequency of the oxygenation metering pump 4 according to the deviation value of the dissolved oxygen amount to obtain the corrected pump frequency FA2Thereby realizing the automatic and accurate control of the adding amount of the oxygen-enriched water or the dilute hydrogen peroxide and/or the alkalizer.
Compared with the prior art, the invention has the following advantages:
1. carry out the oxygen processing alone to high drainage that adds, thoroughly solve under the feedwater low oxygen processing condition high drainage system's that adds flow accelerated corrosion problem, give consideration to simultaneously feedwater low oxygen processing and taken into account the problem of stifled pipe, the pipe explosion that has solved the steam conduit cinder and drop and cause, realize the comprehensive protection of thermal power plant steam system.
2. Air or oxygen-enriched water is used as an oxygenation medium, so that the safety problem of oxygenation of a high-pressure oxygenation drainage system under the conditions of high temperature and high pressure is solved.
3. The three high-pressure drainage oxygenation systems of air, oxygen-enriched water or dilute hydrogen peroxide can be selected, switched and combined at will, can adapt to different field conditions, and meet different requirements of power plants.
4. And an alkalizer can be added to assist in improving the pH value of the high pressure water drainage system while adding oxygen, so that the corrosion of the high pressure water drainage system is inhibited more favorably.
5. The PLC is used for carrying out feedforward PID adjustment on the oxygen adding electric regulating valve and the oxygen adding metering pump to realize accurate and automatic control of oxygen addition, and the oxygen adding amount does not need to be adjusted manually according to load change frequently.
Drawings
FIG. 1 is a schematic diagram of the structure of the high hydrophobicity automatic oxygen adding system of the present invention.
FIG. 2 is a schematic diagram of the automatic and precise control of oxygen addition amount by the automatic high-hydrophobicity oxygen adding system.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 and 2, when air is selected as a high-pressure-added hydrophobic oxygenation medium, the demineralized water intake valve 1, the oxygen cylinder outlet valve 16, the solubilization device front isolation valve 14 and the liquid oxygenation stop valve 7 are closed, the compressed air preparation system outlet valve 17, the oxygenation electric regulating valve front isolation valve 13, the oxygenation electric regulating valve 12 and the gaseous oxygenation stop valve 9 are opened, the pressure of the air at the outlet of the oxygenation electric regulating valve 12 is stabilized to 10.5MPa by the compressed air preparation system 19 through the compressed air preparation system outlet valve 17 to the gas pressure reducing valve 15, then through the oxygenation electric regulating valve front isolation valve 13 to the oxygenation electric regulating valve 12, and the pressure difference between the inlet and the outlet of the oxygenation electric regulating valve 12 is 0.5MPa by the oxygenation pressure stabilizing valve 10. Under the condition that the pressure difference between the inlet and the outlet of the oxygen adding electric regulating valve 12 is stable, the adding amount of the air is in direct proportion to the opening degree of the oxygen adding electric regulating valve 12For example, the PLC 11 can automatically adjust the opening of the oxygen-adding electric regulating valve 12 to control the oxygen-adding flow rate so as to realize the automatic accurate control of the oxygen-adding amount, the unit load P is used as a feedforward signal, and the opening O of the oxygen-adding electric regulating valve 12 is used as a feedforward signalA1The set value D of the dissolved oxygen amount is equal to the unit load PO1In a certain condition, the ratio coefficient is set as KA，OA1＝KA×DO1× P, and simultaneously, collecting the real-time dissolved oxygen D of the feed waterO2And is combined with the dissolved oxygen set value DO1Comparing the measured values, performing PID (proportion integration differentiation) adjustment on the opening of the oxygen adding electric regulating valve 12 according to the deviation value of the dissolved oxygen amount to obtain a corrected valve opening OA2。
When the oxygen-enriched water is selected as a high-pressure-increasing hydrophobic oxygenation medium, the front isolation valve 13 and the gaseous oxygenation stop valve 9 of the oxygenation electric regulating valve are closed, the demineralized water intake valve 1, the oxygen cylinder outlet valve 16 or the compressed air preparation system outlet valve 17, the solubilization device front isolation valve 14 and the liquid oxygenation stop valve 7 are opened, and the demineralized water required for preparing the oxygen-enriched water is decompressed to 1.0MPa by the demineralized water intake valve 1 through the liquid pressure reducing valve 2 and then is conveyed to the solubilization device 3. The oxygen required by the preparation of the oxygen-enriched water is decompressed to 1.0MPa from a compressed air preparation system 19 through an outlet valve 17 of the compressed air preparation system to a gas pressure reducing valve 15, the decompressed compressed air is decompressed to 1.0MPa through a front isolation valve 14 of the solubilizing device, or the decompressed oxygen is decompressed to 1.0MPa from an oxygen cylinder 18 through an outlet valve 16 of the oxygen cylinder to the gas pressure reducing valve 15, and the decompressed oxygen is decompressed to the solubilizing device 3 through the front isolation valve 14 of the solubilizing device. Oxygen and the desalted water are fully mixed in the solubilizing device 3 to prepare oxygen-saturated oxygen-enriched water under a certain oxygen partial pressure. The solubilization device 3 is provided with a liquid level upper limit and a liquid level lower limit, water replenishing is started when the liquid level lower limit is lower than the liquid level lower limit, water replenishing is stopped when the liquid level upper limit is higher than the liquid level upper limit, and the gas partial pressure in the solubilization device 3 is kept to be 1.0MPa all the time. A metering pump with the maximum outlet pressure of more than 10MPa is selected for oxygenation, the addition amount of the oxygen-enriched water and the frequency of the oxygenation metering pump 4 are in direct proportion, the flow of the oxygen-enriched water can be controlled by automatically adjusting the frequency of the oxygenation metering pump 4 through a PLC (programmable logic controller) automatic oxygenation controller 11 to realize automatic accurate control of the oxygenation amount, the unit load P is used as a feedforward signal, and the frequency F of the oxygenation metering pump 4 is used as a feedforward signalW1The set value D of the dissolved oxygen amount is equal to the unit load PO1In a certain condition, the ratio coefficient is set as KW，FW1＝KW×DO1× P, and simultaneously, collecting the real-time dissolved oxygen D of the feed waterO2And is combined with the dissolved oxygen set value DO1Comparing, PID adjusting the frequency of the oxygenation metering pump 4 according to the deviation value of the dissolved oxygen amount to obtain the corrected pump frequency FA2。
When dilute hydrogen peroxide is selected as a high-pressure hydrophobic oxygenation medium and/or an alkalizer is selected as a high-pressure hydrophobic dosing medium, the front isolation valve 14 and the gaseous oxygenation stop valve 9 of the solubilization device are closed, the demineralized water intake valve 1, the liquid pressure reducing valve 2, the liquid medicine tank metering pump 21, the liquid medicine tank metering pump outlet valve 20 and the liquid oxygenation stop valve 7 are opened, and demineralized water required for preparing the mixture of dilute hydrogen peroxide or strong alkaline water or hydrogen peroxide and strong alkaline water is conveyed to the solubilization device 3 after being reduced in pressure to 1.0MPa by the demineralized water intake valve 1 through the liquid pressure reducing valve 2. Hydrogen peroxide and/or an alkalizer required for preparing diluted hydrogen peroxide or strong alkaline water or a mixture of the hydrogen peroxide and the strong alkaline water are conveyed to the solubilization device 3 from a liquid medicine box 22 through a liquid medicine box metering pump 21 and a liquid medicine box metering pump outlet valve 20. The desalted water and hydrogen peroxide and/or alkalizer are respectively conveyed to the solubilization device 3 according to a fixed proportion and are fully mixed in the solubilization device 3, and diluted hydrogen peroxide or strong alkaline water or a mixture of the hydrogen peroxide and the strong alkaline water with a certain concentration is prepared. The solubilization device 3 is provided with an upper limit and a lower limit of the liquid level, starts dispensing when the upper limit of the liquid level is lower than the lower limit of the liquid level, and stops dispensing when the upper limit of the liquid level is higher than the upper limit of the liquid level. The metering pump with the maximum outlet pressure of more than 10MPa is selected for dosing, the adding amount of the dilute hydrogen peroxide and/or the alkalizer and the frequency of the oxygenation metering pump 4 are in direct proportion, the flow of the oxygen-enriched water can be controlled by automatically adjusting the frequency of the oxygenation metering pump 4 through the PLC (programmable logic controller) automatic oxygenation controller 11 to realize the automatic accurate control of the oxygen adding amount, the unit load P is used as a feedforward signal, and the frequency F of the oxygenation metering pump 4 is used as a feedforward signalH1The set value D of the dissolved oxygen amount is equal to the unit load PO1In a certain condition, the ratio coefficient is set as KH，FH1＝KH×DO1× P, and simultaneously, collecting the real-time dissolved oxygen D of the feed waterO2And is combined withAnd the set value D of dissolved oxygenO1Comparing, PID adjusting the frequency of the oxygenation metering pump 4 according to the deviation value of the dissolved oxygen amount to obtain the corrected pump frequency FH2。
Claims (7)
1. The utility model provides a high hydrophobic automatic oxygenation system that adds which characterized in that: comprises a gaseous high-pressure water and high-pressure water drainage oxygenation system, an oxygen-enriched water high-pressure water and high-pressure water drainage oxygenation system, a hydrogen peroxide high-pressure water and high-pressure water drainage oxygenation system and a PLC automatic oxygenation controller (11);
the gaseous high-pressure hydrophobic oxygenation system comprises a compressed air preparation system (19) connected with a high-pressure hydrophobic oxygenation point (8), and a pipeline connecting an outlet of the compressed air preparation system (19) and the high-pressure hydrophobic oxygenation point (8) is sequentially provided with a compressed air preparation system outlet valve (17), a gas pressure reducing valve (15), an oxygenation electric regulating valve front isolation valve (13), an oxygenation electric regulating valve (12), an oxygenation pressure stabilizing valve (10) and a gaseous oxygenation stop valve (9);
the oxygen-enriched water high-pressure drainage oxygenation system comprises a demineralized water taking valve (1) connected with a high-pressure drainage oxygenation point (8) and a compressed air preparation system (19) or an oxygen cylinder (18), wherein a liquid pressure reducing valve (2), a solubilizing device (3), an oxygenation metering pump (4), a pulse damper (5), a back pressure valve (6) and a liquid oxygenation stop valve (7) are sequentially arranged on a pipeline connected with the demineralized water taking valve (1) and the high-pressure drainage oxygenation point (8); a pipeline connecting an outlet of the compressed air preparation system (19) and an inlet of the solubilizing device (3) is sequentially provided with an outlet valve (17) of the compressed air preparation system, a gas pressure reducing valve (15) and a front isolating valve (14) of the solubilizing device, and a pipeline connecting an outlet of the oxygen cylinder (18) and an inlet of the solubilizing device (3) is sequentially provided with an outlet valve (16) of the oxygen cylinder, the gas pressure reducing valve (15) and the front isolating valve (14) of the solubilizing device;
the hydrogen peroxide high-pressure-plus-drainage oxygenation system comprises a desalted water taking valve (1) and a liquid medicine tank (22), wherein the desalted water taking valve (1) is connected with a high-pressure-plus-drainage oxygenation point (8), and a liquid pressure reducing valve (2), a solubilizing device (3), an oxygenation metering pump (4), a pulse damper (5), a back pressure valve (6) and a liquid oxygenation stop valve (7) are sequentially arranged on a pipeline connecting the outlet of the desalted water taking valve (1) and the high-pressure-plus-drainage oxygenation point (8); a liquid medicine tank metering pump (21) and a liquid medicine tank metering pump outlet valve (20) are sequentially arranged on a pipeline connecting an outlet of the liquid medicine tank (22) and an inlet of the solubilizing device (3);
the oxygenation electric regulating valve (12) and the oxygenation metering pump (4) are connected with the PLC automatic oxygenation controller (11).
2. The high plus hydrophobic automatic oxygen adding system according to claim 1, characterized in that: in the gaseous high-pressure hydrophobic oxygenation system, an oxygenation medium must be air, the air is decompressed to a preset value from a compressed air preparation system (19) through an outlet valve (17) of the compressed air preparation system to a gas pressure reducing valve (15), then is decompressed to a preset value through an isolation valve (13) in front of an oxygenation electric regulating valve to an oxygenation electric regulating valve (12), the pressure of the compressed air at the outlet of the oxygenation electric regulating valve (12) is stabilized to the preset value through an oxygenation pressure stabilizing valve (10), the pressure difference between the inlet and the outlet of the oxygenation electric regulating valve (12) is constant at the moment, and the opening of the oxygenation electric regulating valve (12) is automatically adjusted through a PLC (11) to control the oxygenation flow so as to realize the automatic and accurate control of the oxygenation amount.
3. The high plus hydrophobic automatic oxygen adding system according to claim 1, characterized in that: in the oxygen-enriched water high-pressure hydrophobic oxygenation system, an oxygenation medium is oxygen-enriched water, and desalted water required by preparing the oxygen-enriched water is delivered to a solubilization device (3) from a desalted water taking valve (1) through a liquid pressure reducing valve (2); oxygen required for preparing the oxygen-enriched water is delivered to the solubilizing device (3) from a compressed air preparation system (19) through an outlet valve (17) of the compressed air preparation system, a gas pressure reducing valve (15) and a front isolating valve (14) of the solubilizing device, or delivered to the solubilizing device (3) from an oxygen bottle (18) through an outlet valve (16) of the oxygen bottle, the gas pressure reducing valve (15) and the front isolating valve (14) of the solubilizing device; oxygen and demineralized water are fully mixed in the solubilizing device (3) to prepare oxygen-saturated oxygen-enriched water under certain oxygen partial pressure, and the flow of the oxygen-enriched water is controlled by automatically adjusting the frequency of the oxygen-adding metering pump (4) through the PLC (programmable logic controller) automatic oxygen adding controller (11) to realize automatic and accurate control of oxygen adding amount.
4. The high plus hydrophobic automatic oxygen adding system according to claim 1, characterized in that: in the hydrogen peroxide high-pressure hydrophobic oxygenation system, a medium is dilute hydrogen peroxide and/or an alkalizer, wherein the dilute hydrogen peroxide is used as a high-pressure hydrophobic oxygenation medium, the alkalizer is used as a high-pressure hydrophobic dosing medium, and desalted water required for preparing the dilute hydrogen peroxide and/or strong alkaline water is delivered to a solubilization device (3) from a desalted water taking valve (1) through a liquid pressure reducing valve (2); hydrogen peroxide and/or an alkalizer required for preparing diluted hydrogen peroxide and/or strong alkaline water are delivered to a solubilization device (3) from a liquid medicine box (22) through a liquid medicine box metering pump (21) and a liquid medicine box metering pump outlet valve (20); a certain amount of desalted water and a certain amount of hydrogen peroxide and/or alkalizer are fully mixed in the capacity increasing device (3) to prepare a mixture of dilute hydrogen peroxide or strong alkaline water or hydrogen peroxide and strong alkaline water with a certain concentration, and the flow of the dilute hydrogen peroxide or strong alkaline water or the mixture of the hydrogen peroxide and the strong alkaline water is controlled by automatically adjusting the frequency of the oxygen adding metering pump (4) through the PLC (programmable logic controller) automatic oxygen adding controller (11) to realize the automatic and accurate control of the oxygen adding amount and the medicine adding amount.
5. The high plus hydrophobic automatic oxygen adding system according to claim 1, characterized in that: when the gaseous high-pressure water and high-pressure water drainage oxygenation system or the oxygen-enriched water high-pressure water and high-pressure water drainage oxygenation system is started, the hydrogen peroxide high-pressure water and high-pressure water drainage oxygenation system can be started simultaneously, at the moment, only the alkalizer is added to the hydrogen peroxide high-pressure water and high-pressure water drainage oxygenation system, the alkalizer can assist in improving the pH value of high-pressure water and high-pressure water drainage, and corrosion of the high-pressure water drainage system is more favorably inhibited.
6. The method for oxygenating a high plus hydrophobic automatic oxygenating system as recited in any one of claims 1 to 5 wherein: the high-hydrophobicity oxygenation medium is air or oxygen-enriched water or dilute hydrogen peroxide, and the pH value of the high-hydrophobicity oxygenation medium can be increased by adding oxygen and an auxiliary alkalizer;
when air is selected as a high-pressure-increased hydrophobic oxygenation medium, a demineralized water intake valve (1), an oxygen cylinder outlet valve (16), a solubilizing device front isolation valve (14) and a liquid oxygenation stop valve (7) are closed, a compressed air preparation system outlet valve (17), an oxygenation electric regulating valve front isolation valve (13), an oxygenation electric regulating valve (12) and a gaseous oxygenation stop valve (9) are opened, and air sequentially passes through the compressed air preparation system outlet valve (17), a gas reducing valve (15), the oxygenation electric regulating valve front isolation valve (13), the oxygenation electric regulating valve (12), an oxygenation pressure stabilizing valve (10) and the gaseous oxygenation stop valve (9) and is added with a high-pressure-increased hydrophobic oxygenation point (8); the opening of the oxygen adding electric regulating valve (12) is automatically regulated by a PLC automatic oxygen adding controller (11) to control the oxygen adding flow so as to realize the automatic and accurate control of the oxygen adding amount;
when oxygen-enriched water is selected as a high-pressure hydrophobic oxygenation medium, a front isolation valve (13) of an oxygenation electric regulating valve and a gaseous oxygenation stop valve (9) are closed, a demineralized water intake valve (1), an oxygen cylinder outlet valve (16) or a compressed air preparation system outlet valve (17), a solubilization device front isolation valve (14) and a liquid oxygenation stop valve (7) are opened, demineralized water and oxygen or air are fully mixed in a solubilization device (3) to prepare oxygen-enriched water, and the oxygen-enriched water sequentially passes through an oxygenation metering pump (4), a pulse damper (5), a back pressure valve (6) and the liquid oxygenation stop valve (7) and is added into a high-pressure hydrophobic oxygenation point (8); the frequency of the oxygen adding metering pump (4) is automatically adjusted by a PLC (programmable logic controller) automatic oxygen adding controller (11) to control the flow of the oxygen-enriched water so as to realize automatic and accurate control of the oxygen adding amount;
when dilute hydrogen peroxide is selected as a high-pressure hydrophobic oxygenation medium and/or an alkalizer is selected as a high-pressure hydrophobic dosing medium, closing an isolation valve (14) and a gaseous oxygenation stop valve (9) in front of a solubilization device, opening a demineralized water intake valve (1), a liquid pressure reducing valve (2), a liquid medicine tank metering pump (21), a liquid medicine tank metering pump outlet valve (20) and a liquid oxygenation stop valve (7), fully mixing demineralized water and hydrogen peroxide and/or the alkalizer in a fixed ratio in the solubilization device (3) to prepare a mixture of dilute hydrogen peroxide or strong-alkaline water or hydrogen peroxide and strong-alkaline water, and sequentially adding a high-pressure hydrophobic oxygenation point (8) into the mixture of dilute hydrogen peroxide or strong-alkaline water or the mixture of hydrogen peroxide and strong-alkaline water through an oxygenation metering pump (4), a pulse damper (5), a back pressure valve (6) and the liquid oxygenation stop valve (7); the flow of dilute hydrogen peroxide or strong alkaline water or a mixture of the hydrogen peroxide and the strong alkaline water is controlled by automatically adjusting the frequency of the oxygenation metering pump (4) through a PLC (programmable logic controller) automatic oxygenation controller (11) so as to realize the automatic and accurate control of the oxygenation amount and the dosing amount.
7. The oxygenation method according to claim 6, characterized in that: the method for realizing the automatic accurate control of the oxygen addition amount is feedforward PID control;
when the highly water-adding and draining oxygenation medium is air, the adding amount of the air is in direct proportion to the valve opening of the oxygenation electric regulating valve (12), so that the adding amount of the air is represented by the opening of the oxygenation electric regulating valve (12), the unit load P is used as a feedforward signal, and the opening O of the oxygenation electric regulating valve (12) at the momentA1The set value D of the dissolved oxygen amount is equal to the unit load PO1In a certain condition, the ratio coefficient is set as KA，OA1＝KA×DO1× P, and simultaneously, collecting the real-time dissolved oxygen D of the feed waterO2And is combined with the dissolved oxygen set value DO1Comparing the difference value with the dissolved oxygen value, and performing PID adjustment on the opening of the oxygen-adding electric regulating valve (12) according to the deviation value of the dissolved oxygen amount to obtain a corrected valve opening OA2Thereby realizing the automatic and accurate control of the air adding amount;
when the high-pressure hydrophobic oxygenation medium is oxygen-enriched water or dilute hydrogen peroxide and/or an alkalizer, the adding amount of the oxygen-enriched water or dilute hydrogen peroxide and/or the alkalizer is in direct proportion to the frequency of the oxygenation metering pump (4), so that the adding amount of the oxygen-enriched water or dilute hydrogen peroxide and/or the alkalizer is represented by the frequency of the oxygenation metering pump (4), the unit load P is used as a feedforward signal, and the frequency F of the oxygenation metering pump (4) is at the momentW1The set value D of the dissolved oxygen amount is equal to the unit load PO1In a certain condition, the ratio coefficient is set as KW，FW1＝KW×DO1× P, and simultaneously, collecting the real-time dissolved oxygen D of the feed waterO2And is combined with the dissolved oxygen set value DO1Comparing, and performing PID adjustment on the frequency of the oxygenation metering pump (4) according to the deviation value of the dissolved oxygen amount to obtain a corrected pump frequency FA2Thereby realizing the automatic and accurate control of the adding amount of the oxygen-enriched water or the dilute hydrogen peroxide and/or the alkalizer.
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