CN113651435A - Self-response unpowered breathable film oxygen increasing, water supplying and oxygen adding device and method - Google Patents
Self-response unpowered breathable film oxygen increasing, water supplying and oxygen adding device and method Download PDFInfo
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- CN113651435A CN113651435A CN202111101925.1A CN202111101925A CN113651435A CN 113651435 A CN113651435 A CN 113651435A CN 202111101925 A CN202111101925 A CN 202111101925A CN 113651435 A CN113651435 A CN 113651435A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 360
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 172
- 239000001301 oxygen Substances 0.000 title claims abstract description 172
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 172
- 230000004044 response Effects 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000006213 oxygenation reaction Methods 0.000 claims abstract description 129
- 230000001105 regulatory effect Effects 0.000 claims abstract description 58
- 238000010438 heat treatment Methods 0.000 claims abstract description 27
- 239000012528 membrane Substances 0.000 claims abstract description 27
- 238000005070 sampling Methods 0.000 claims abstract description 14
- 239000007789 gas Substances 0.000 claims description 19
- 239000007788 liquid Substances 0.000 claims description 12
- 229920006395 saturated elastomer Polymers 0.000 claims description 11
- 230000008859 change Effects 0.000 claims description 10
- 239000012466 permeate Substances 0.000 claims description 9
- 238000005273 aeration Methods 0.000 claims description 7
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 4
- 230000004888 barrier function Effects 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000013589 supplement Substances 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
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
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Abstract
The invention discloses a self-response unpowered ventilated membrane oxygenation, water feeding and oxygenation device and a method, wherein the system comprises a deaerator, an outlet of the deaerator is connected with a water supply pipeline through a deaerator descending pipe, the water supply pipeline is communicated with a heating surface system, a water supply pump is arranged on the deaerator descending pipe, the water supply pipeline is provided with a water supply flow regulating valve, an oxygenated water intake and an oxygen content measuring and sampling port are sequentially arranged on the water supply pipeline behind the water supply flow regulating valve and in front of the heating surface system, the oxygenated water intake is connected with an inlet of a ventilated membrane oxygenation tank through an oxygenated water pressure reducing valve and an oxygenated water flow regulating valve in sequence, an oxygenation point connected with the outlet of the ventilated membrane oxygenation tank is positioned on the deaerator descending pipe, oxygenated water enters the ventilated membrane oxygenation tank for oxygenation, and is added into the water supply pipeline through the oxygenation point after oxygenation reaches a saturation concentration; the oxygen content measuring and sampling port is connected with the oxygenation water flow controller through the oxygen content measuring instrument, and the oxygenation water flow controller feeds back a control signal to the oxygenation water flow regulating valve to control the oxygenation water flow according to an oxygen content analysis result.
Description
Technical Field
The invention relates to the technical field of oxygenation of a water supply system of a thermal power plant, in particular to a self-response unpowered breathable film oxygenation water supply oxygenation device and method.
Background
The water supply system of the thermal power plant needs to be oxygenated, a certain concentration of dissolved oxygen is maintained to meet the passivation requirements of the water supply system, the economizer and the water system, the water supply system, the high-pressure heater, the economizer and the water-cooled wall are protected against corrosion, and meanwhile, because the concentration of oxygen in superheated steam is close to zero, the risk of promoting the concentrated falling of oxide skin of the superheater is avoided. Therefore, the oxygenation treatment technology is the safest water treatment method which solves the problems of corrosion and scaling of a water vapor system of a unit of a thermal power plant and improves the running economy of the unit.
The traditional oxygenation device is divided into a gas oxygenation device and a liquid oxygenation device.
The first is a gaseous oxygen adding device which mainly comprises an oxygen cylinder, a bus bar, an oxygen flow control device, an oxygen conveying pipeline and the like. And a batch of oxygen cylinders are stored in the oxygenation room to form a great hazard source, so that the operation safety risk is increased. The operator needs to patrol the pressure of the gas cylinder, change the gas cylinder regularly, and carry out gas tightness inspection after changing the gas cylinder every time, so that the operation and maintenance workload is large. Because the gas has the characteristics of compressibility, small oxygenation flow, high oxygenation pressure and the like, the oxygenation control precision is poor, and the safe and economic operation of the unit is not facilitated
The second liquid state oxygenation of the traditional oxygenation device is implemented after oxygen is dissolved in liquid water, a water source is taken from demineralized water for water supplement, and oxygen is dissolved in the demineralized water and then added into a water supply system by a metering pump for oxygenation. Because thermal load of the thermal power plant changes faster, the feed water flow also fluctuates faster, the feed water pressure flow also fluctuates faster, and certain response time is needed for feeding back to the metering pump after the flow signal fluctuates, thereby influencing the oxygenation control precision.
Therefore, the development of a simple, reliable and automatic corresponding accurate oxygenation adjusting oxygenation device and an oxygenation method becomes a key technology for ensuring the safe and economic operation of the unit and reducing the work of operation and maintenance personnel to the maximum extent.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention aims to provide a self-response unpowered breathable film oxygen-increasing, water-supplying and oxygen-adding device and method, the device and method automatically respond to the change of the water-supplying flow and automatically adjust the flow of the oxygen-adding water, so that the oxygen-adding amount is automatically changed correspondingly, and the oxygen-adding precision is maintained; meanwhile, the oxygenated water is taken from the high-pressure side of the water supply pipeline, and the oxygenation point is connected to the low-pressure side of the downcomer of the deaerator, so that a power system is not needed, and the use and maintenance cost is reduced; the invention adopts the breathable waterproof membrane to oxygenate the oxygenated water, and the whole oxygenation system has no air space, thereby avoiding the precision influence caused by air compression. Thereby realizing the self-response unpowered breathable film oxygenation, water supply and oxygen addition.
In order to achieve the purpose, the invention adopts the following technical scheme:
a self-response unpowered breathable film oxygenation water supply and oxygen adding device comprises a deaerator 1, wherein an outlet of the deaerator 1 is connected with a water supply pipeline through a deaerator descending pipe 2, the water supply pipeline is communicated with a heating surface system 7, a water supply pump 3 is arranged on the deaerator descending pipe 2, the water supply pipeline is provided with a water supply flow regulating valve 4, an oxygen adding water intake 5 and an oxygen content measuring and sampling port 6 are sequentially arranged on the water supply pipeline behind the water supply flow regulating valve 4 and in front of the heating surface system 7, the oxygen adding water intake 5 is connected with an inlet of a breathable film oxygenation tank 12 through an oxygen adding water pressure reducing valve 10 and an oxygen adding water flow regulating valve 11 in sequence, an oxygen adding point 13 connected with an outlet of the breathable film oxygenation tank 12 is positioned on the deaerator descending pipe 2 at the outlet of the deaerator 1, the oxygenated water enters the breathable film oxygenation tank 12 for oxygen adding, and is added into the water supply pipeline through the oxygen adding point 13 after oxygen adding is added to saturation concentration; the oxygen content measuring and sampling port 6 is connected with an inlet of an oxygenation water flow controller 9 through an oxygen content measuring instrument 8, an outlet of the oxygenation water flow controller 9 is connected with an oxygenation water flow regulating valve 11, and the oxygenation water flow controller 9 feeds back a control signal to the oxygenation water flow regulating valve 11 according to an oxygen content analysis result to control the oxygenation water flow; the oxygen content measuring instrument 8, the oxygen adding water flow controller 9, the oxygen adding water pressure reducing valve 10 and the oxygen adding water flow regulating valve 11 form an oxygen adding system.
The oxygen adding water intake 6 is arranged behind the water supply flow regulating valve 4, and because the resistance of the subsequent heating surface system 7 is constant, the flow and the pressure at the oxygen adding water intake 6 are completely in linear corresponding relation; meanwhile, the resistance of the oxygenation system is constant, the oxygenation point 13 is arranged on the deaerator downcomer 2, and the pressure of the deaerator downcomer 2 is stable, so that the flow of oxygenation water can automatically change along with the flow of feed water, and automatic response oxygenation control is realized, so that the change of oxygenation amount is automatically responded, and the oxygenation precision is maintained; an oxygenation water flow regulating valve 11 arranged in the oxygenation system only finely regulates the flow of the oxygenation water, so that the accurate control of the oxygenation amount is realized; and because the oxygen-adding water intake 6 is arranged behind the water supply flow regulating valve 4, the water supply pressure at the water supply is far higher than the oxygen adding point, namely the pressure of a downcomer of the deaerator, a power device is not needed to be configured, and the oxygen-adding water flows into the oxygen adding point 13 under the normal pressure difference.
The saturated dissolved oxygen concentration is 8-9 mg/L under the condition of 20 ℃, and the oxygen adding concentration is controlled to be 10-30 mug/L, so that the water taking ratio of the oxygenated water is 1/300 of the water supply, and the water taking ratio has little influence on the water supply flow.
The aeration tank 12 is provided with an aeration water by adopting a breathable waterproof membrane, and is divided into a gas side and a water side, the middle part is separated by the breathable waterproof membrane, the breathable waterproof membrane is made of a high-molecular microporous structure, the diameter of air molecules is small, and the air molecules can smoothly permeate the water side; oxygen molecules in the air continuously permeate into the oxygenated water on the water side from the air until the saturated concentration is reached; the liquid water is balanced by the surface tension, namely the water molecules are pulled mutually, and the water molecules can not smoothly separate from the liquid water and permeate to the air side, so that the water permeation is prevented; therefore, the oxygenated water flows on the water side, and the oxygenated water cannot flow from the water side to the gas side due to the barrier of the air-permeable waterproof membrane.
Because the breathable waterproof membrane is adopted for aeration at intervals, a gas-liquid exchange space of the oxygen dissolving tank is not needed, so that the whole oxygenation system has no gas space, flow fluctuation caused by gas compression is avoided, and the influence on oxygenation precision is avoided.
The heating surface system 7 comprises an economizer and a water-cooled wall which are connected
The working method of the self-response unpowered breathable film oxygen-increasing, water-supplying and oxygen-adding device comprises the following steps:
the method comprises the following steps: at the initial stage of starting the thermal power generating set, oxygen is not required to be added into feed water, the oxygen-adding water flow regulating valve 11 is closed, the feed water enters a deaerator descending pipe 2 from a deaerator 1, then the feed water is pumped into a feed water pipeline by a feed water pump 3, the feed water flow is regulated by a feed water flow regulating valve 4, when the set needs to lift the load, the opening degree of the feed water flow regulating valve is increased, the feed water flow is increased, when the set needs to reduce the load, the opening degree of the feed water flow regulating valve is reduced, the feed water flow is reduced, and finally the feed water enters a heating surface system;
step two: after the thermal power generating set operates stably, water feeding and oxygen adding are started, feed water enters a deaerator descending pipe 2 from a deaerator 1, then is pumped into a water feeding pipeline through a water feeding pump 3, the water feeding flow is adjusted through a water feeding flow adjusting valve 4, when the thermal power generating set needs to lift a load, the opening degree of the water feeding flow adjusting valve is increased, the water feeding flow is increased, when the thermal power generating set needs to reduce the load, the opening degree of the water feeding flow adjusting valve is reduced, the water feeding flow is reduced, and finally the feed water enters a heating surface system; sampling and analyzing the oxygen content of the feed water at an oxygen content measuring and sampling port 6 in front of the inlet of the heating surface system, feeding an analysis result back to an oxygen adding water flow controller 9 by an oxygen content measuring instrument 8, feeding a control signal back to an oxygen adding water flow regulating valve 11 by the oxygen adding water flow controller 9 according to the oxygen content analysis result to accurately control the flow of the oxygen adding water, feeding the oxygen adding water into a breathable film oxygen adding tank 12 for oxygen adding, and adding the oxygen adding water into a water feed pipeline through an oxygen adding point 13 after the oxygen adding is performed to a saturated concentration;
step three: before the operation of the thermal power generating unit is stopped, the water supply and oxygen addition need to be finished in advance; feed water enters a deaerator downcomer 2 from a deaerator 1, then is pumped into a feed water pipeline by a feed water pump 3, the feed water flow is adjusted by a feed water flow adjusting valve 4, an oxygenation water flow controller 9 sends a control signal to gradually reduce the opening degree of an oxygenation water flow adjusting valve 11, the oxygenation water flow is controlled until the opening degree is zero, oxygenation control is finished, and the feed water finally enters a heating surface system.
Compared with the prior art, the invention has the following advantages:
1. the device is characterized in that an oxygen adding water intake 6 is arranged behind a water supply flow regulating valve 4, and because the resistance of a subsequent economizer and other heating surface systems is basically constant, the flow and the pressure at the oxygen adding water intake 6 are in a linear corresponding relation completely; meanwhile, the resistance of the oxygenation system is basically constant, the oxygenation point 13 is arranged on the downcomer 2 of the deaerator, and the pressure of the downcomer 2 of the deaerator is basically stable, so that the flow of oxygenation water can automatically change along with the flow of feed water, and automatic response oxygenation control is realized, so that the change of oxygenation amount is automatically responded, and the oxygenation precision is maintained; the oxygenation water flow regulating valve 11 arranged in the oxygenation system only finely adjusts the oxygenation water flow, and the accurate control of the oxygenation amount is realized.
2. The device of the invention adopts the breathable waterproof membrane for interval oxygenation, and does not need a gas-liquid exchange space of the oxygen dissolving tank, so that the integral oxygenation system has no gas space, flow fluctuation caused by gas compression is avoided, and the influence on oxygenation precision is avoided.
3. The device has no power system, reduces the operation energy consumption and reduces the use and maintenance cost.
4. Compared with the traditional oxygenation device which uses pure oxygen or high-pressure compressed air, the invention adopts normal-pressure air as an oxygen source, thereby greatly improving the safety and stability of oxygenation operation.
Drawings
FIG. 1 is a schematic view of a self-response unpowered permeable membrane oxygen-increasing, water-feeding and oxygen-adding device.
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, a self-response unpowered breathable film oxygen-increasing, water-feeding and oxygen-adding device comprises a deaerator 1, wherein an outlet of the deaerator 1 is connected with a water supply pipeline through a deaerator descending pipe 2, the water supply pipeline is communicated with a heating surface system 7, a water supply pump 3 is arranged on the deaerator descending pipe 2, the water supply pipeline is provided with a water supply flow regulating valve 4, an oxygen-added water intake 5 and an oxygen content measuring and sampling port 6 are sequentially arranged on the water supply pipeline behind the water supply flow regulating valve 4 and in front of the heating surface system 7, the oxygen-added water intake 5 is connected with an inlet of a breathable film oxygen-adding tank 12 through an oxygen-added water reducing valve 10 and an oxygen-added water flow regulating valve 11 in sequence, an oxygen adding point 13 connected with an outlet of the breathable film oxygen-adding tank 12 is positioned on the deaerator descending pipe 2 at the outlet of the deaerator 1, the oxygen-added water enters the breathable film oxygen-adding tank 12, and is added into the water supply pipeline through the oxygen adding point 13 after the oxygen is added to a saturation concentration; the oxygen content measuring and sampling port 6 is connected with an inlet of an oxygenation water flow controller 9 through an oxygen content measuring instrument 8, an outlet of the oxygenation water flow controller 9 is connected with an oxygenation water flow regulating valve 11, and the oxygenation water flow controller 9 feeds back a control signal to the oxygenation water flow regulating valve 11 according to an oxygen content analysis result to control the oxygenation water flow; the oxygen content measuring instrument 8, the oxygen adding water flow controller 9, the oxygen adding water pressure reducing valve 10 and the oxygen adding water flow regulating valve 11 form an oxygen adding system. The method comprises the following steps that feed water enters a deaerator descending pipe 2 from a deaerator 1, then is pumped into a feed water pipeline by a feed water pump 3, the feed water flow is adjusted by a feed water flow adjusting valve 4, when a unit needs to lift load, the opening degree of the feed water flow adjusting valve is increased, the feed water flow is increased along with the increase of the feed water flow, when the unit needs to reduce the load, the opening degree of the feed water flow adjusting valve is reduced, the feed water flow is reduced along with the reduction of the feed water flow, and finally the feed water enters a heating surface system such as an economizer; the oxygen content of the feed water is sampled and analyzed at an oxygen content measuring and sampling port 6 in front of an inlet of the economizer, the analysis result is fed back to an oxygen adding water flow controller 9 by an oxygen content measuring instrument 8, the oxygen adding water flow controller 9 feeds back a control signal to an oxygen adding water flow regulating valve 11 according to the oxygen content analysis result to control the oxygen adding water flow, the oxygen adding water then enters a breathable film oxygen adding tank 12 to add oxygen, and the oxygen is added into a feed water pipeline through an oxygen adding point after the oxygen is added to the saturated concentration.
The oxygen adding water intake 6 of the device is arranged behind the water supply flow regulating valve 4, and because the resistance of the subsequent economizer and other heating surface systems is basically constant, the flow and the pressure at the oxygen adding water intake 6 are completely in a linear corresponding relation; meanwhile, the resistance of the oxygenation system is basically constant, the oxygenation point 13 is arranged on the downcomer 2 of the deaerator, and the pressure of the downcomer 2 of the deaerator is basically stable, so that the flow of oxygenation water can automatically change along with the flow of feed water, and automatic response oxygenation control is realized, so that the change of oxygenation amount is automatically responded, and the oxygenation precision is maintained; the oxygenation water flow regulating valve 11 arranged in the oxygenation system only finely adjusts the oxygenation water flow, and the accurate control of the oxygenation amount is realized. The saturated dissolved oxygen concentration is 8-9 mg/L under the condition of 20 ℃ generally, and the oxygen adding concentration is controlled to be 10-30 mug/L generally, so the water taking ratio of the oxygenated water is 1/300 of the water supply, and the water taking ratio has little influence on the water supply flow.
This device adopts ventilative water proof membrane to carry out oxygenation to the oxygenated water in ventilated membrane oxygenation jar 12, and ventilated membrane oxygenation jar divide into gas side and water side two parts, and the centre is with ventilative water proof membrane interval, and the material of ventilative water proof membrane is polymer microporous structure, and the air molecule diameter is very little, can permeate the water side smoothly. Oxygen molecules in the air continuously permeate into the oxygenated water on the water side from the air until the saturated concentration is reached; and due to the action of surface tension (mutual 'pull-up and counter-balance' among water molecules), the water molecules can not smoothly separate from the liquid water and permeate to the other side, so that the water permeation is prevented. The oxygenated water flows on the water side, and the oxygenated water cannot flow from the water side to the gas side due to the obstruction of the breathable waterproof membrane.
The device adopts the breathable waterproof membrane for interval oxygenation, and does not need a gas-liquid exchange space of an oxygen dissolving tank, so that the whole oxygenation system has no gas space, the flow fluctuation caused by gas compression is avoided, and the influence on oxygenation precision is avoided.
The working method of the self-response unpowered breathable film oxygen increasing, water supplying and oxygen adding device comprises the following steps:
the method comprises the following steps: at the initial stage of starting the thermal power generating set, oxygen does not need to be added into the feed water, the implementation steps are as follows, an oxygen adding water flow regulating valve 11 is used, the feed water enters a deaerator descending pipe 2 from a deaerator 1, then a feed water pump 3 is used for pumping the feed water into a feed water pipeline, the feed water flow is regulated by a feed water flow regulating valve 4, when the set needs to lift the load, the opening degree of the feed water flow regulating valve is increased, the feed water flow is increased along with the increase of the feed water flow, when the set needs to reduce the load, the opening degree of the feed water flow regulating valve is reduced along with the decrease of the feed water flow, and finally the feed water enters a heating surface system such as an economizer and the like.
Step two: after the thermal power generating set operates stably, water feeding and oxygen adding are started, feed water enters a deaerator descending pipe 2 from a deaerator 1, then is pumped into a water feeding pipeline through a water feeding pump 3, the water feeding flow is adjusted through a water feeding flow adjusting valve 4, when the thermal power generating set needs to lift a load, the opening degree of the flow adjusting valve is increased, the water feeding flow is increased, when the thermal power generating set needs to reduce the load, the opening degree of the flow adjusting valve is reduced, the water feeding flow is reduced, and finally the feed water enters a heating surface system such as an economizer; the oxygen content of the feed water is sampled and analyzed at an oxygen content measuring and sampling port 6 in front of an inlet of the economizer, the analysis result is fed back to an oxygen adding water flow controller 9 by an oxygen content measuring instrument 8, the oxygen adding water flow controller 9 feeds back a control signal to an oxygen adding water flow regulating valve 11 according to the oxygen content analysis result to accurately control the flow of the oxygen adding water, the oxygen adding water then enters a breathable film oxygen adding tank 12 for oxygen adding, and the oxygen adding water is added into a feed water pipeline through an oxygen adding point 13 after being added to the saturated concentration.
Step three: before the operation of the thermal power generating unit is stopped, the water supply and oxygen addition need to be finished in advance. Feed water enters a deaerator downcomer 2 from a deaerator 1, then is pumped into a feed water pipeline by a feed water pump 3, the feed water flow is adjusted by a feed water flow adjusting valve 4, an oxygenation water flow controller 9 sends a control signal to gradually reduce the opening degree of an oxygenation water flow adjusting valve 11, the oxygenation water flow is controlled until the opening degree is zero, oxygenation control is finished, and the feed water finally enters a heating surface system such as an economizer.
Claims (7)
1. The utility model provides a self-response unpowered ventilated membrane oxygenation feedwater oxygenation device which characterized in that: the oxygen-enriched water heating device comprises a deaerator (1), wherein the outlet of the deaerator (1) is connected with a water supply pipeline through a deaerator descending pipe (2), the water supply pipeline is communicated with a heating surface system (7), a water supply pump (3) is arranged on the deaerator descending pipe (2), the water supply pipeline is provided with a water supply flow regulating valve (4), the water supply pipeline in front of the heating surface system (7) behind the water supply flow regulating valve (4) is sequentially provided with an oxygen-enriched water intake (5) and an oxygen content measuring and sampling port (6), the oxygen-enriched water intake (5) is sequentially connected with the inlet of a breathable film oxygen-enriched tank (12) through an oxygen-enriched water reducing valve (10) and an oxygen-enriched water flow regulating valve (11), an oxygen-enriched point (13) connected with the outlet of the breathable film oxygen-enriched tank (12) is positioned on the deaerator descending pipe (2) at the outlet of the deaerator (1), the oxygen-enriched water enters the breathable film oxygen-enriched tank (12) for oxygen enrichment, and is added into the water supply pipeline through the oxygen-enriched point (13) after oxygen enrichment is saturated concentration; the oxygen content measuring and sampling port (6) is connected with an inlet of an oxygenation water flow controller (9) through an oxygen content measuring instrument (8), an outlet of the oxygenation water flow controller (9) is connected with an oxygenation water flow regulating valve (11), and the oxygenation water flow controller (9) feeds back a control signal to the oxygenation water flow regulating valve (11) according to an oxygen content analysis result to control the oxygenation water flow; the oxygen content measuring instrument (8), the oxygenation water flow controller (9), the oxygenation water reducing valve (10) and the oxygenation water flow regulating valve (11) form an oxygenation system.
2. The self-response unpowered breathable film oxygen increasing, water supplying and oxygen adding device according to claim 1, characterized in that: the oxygen adding water intake 6 is arranged behind the water supply flow regulating valve 4, and because the resistance of the subsequent heating surface system 7 is constant, the flow and the pressure at the oxygen adding water intake 6 are completely in linear corresponding relation; meanwhile, the resistance of the oxygenation system is constant, the oxygenation point 13 is arranged on the deaerator downcomer (2), and the pressure of the deaerator downcomer (2) is stable, so that the flow of oxygenation water can automatically change along with the flow of feed water, and automatic response oxygenation control is realized, so that the change of oxygenation amount is automatically responded, and the oxygenation precision is maintained; an oxygenation water flow regulating valve 11 arranged in the oxygenation system only finely regulates the flow of the oxygenation water, so that the accurate control of the oxygenation amount is realized; and because the oxygen-adding water intake 6 is arranged behind the water supply flow regulating valve 4, the water supply pressure at the water supply is far higher than the oxygen adding point, namely the pressure of a downcomer of the deaerator, a power device is not needed to be configured, and the oxygen-adding water flows into the oxygen adding point (13) under normal pressure difference.
3. The self-response unpowered breathable film oxygen increasing, water supplying and oxygen adding device according to claim 1, characterized in that: the saturated dissolved oxygen concentration is 8-9 mg/L under the condition of 20 ℃, and the oxygen adding concentration is controlled to be 10-30 mug/L, so that the water taking ratio of the oxygenated water is 1/300 of the water supply, and the water taking ratio has little influence on the water supply flow.
4. The self-response unpowered breathable film oxygen increasing, water supplying and oxygen adding device according to claim 1, characterized in that: the aeration water is aerated by adopting a breathable waterproof membrane in the breathable membrane aeration tank (12), the breathable membrane aeration tank is divided into an air side and a water side, the middle part is separated by the breathable waterproof membrane, the breathable waterproof membrane is made of a high-molecular micropore structure, the diameter of air molecules is small, and the air molecules can smoothly permeate into the water side; oxygen molecules in the air continuously permeate into the oxygenated water on the water side from the air until the saturated concentration is reached; the liquid water is balanced by the surface tension, namely the water molecules are pulled mutually, and the water molecules can not smoothly separate from the liquid water and permeate to the air side, so that the water permeation is prevented; therefore, the oxygenated water flows on the water side, and the oxygenated water cannot flow from the water side to the gas side due to the barrier of the air-permeable waterproof membrane.
5. The self-response unpowered breathable film oxygen increasing, water supplying and oxygen adding device according to claim 5, characterized in that: because the breathable waterproof membrane is adopted for aeration at intervals, a gas-liquid exchange space of the oxygen dissolving tank is not needed, so that the whole oxygenation system has no gas space, flow fluctuation caused by gas compression is avoided, and the influence on oxygenation precision is avoided.
6. The self-response unpowered breathable film oxygen increasing, water supplying and oxygen adding device according to claim 1, characterized in that: the heating surface system (7) comprises an economizer and a water-cooled wall which are connected.
7. The working method of the self-response unpowered breathable film oxygen increasing, water supplying and oxygen adding device of claim 1 is characterized in that: the method comprises the following steps:
the method comprises the following steps: at the initial stage of starting a thermal power generating set, oxygen is not required to be added into feed water, an oxygen adding water flow regulating valve (11) is closed, the feed water enters a deaerator descending pipe (2) from a deaerator (1), then a feed water pump (3) is used for pumping the feed water into a feed water pipeline, the feed water flow is regulated by a feed water flow regulating valve (4), when the set needs to lift the load, the opening degree of the feed water flow regulating valve is increased, the feed water flow is increased along with the increase of the feed water flow, when the set needs to reduce the load, the opening degree of the feed water flow regulating valve is reduced along with the decrease of the feed water flow, and finally the feed water flow enters a heating surface system;
step two: after the thermal power generating set operates stably, feeding water and oxygen are started, feeding water enters a deaerator descending pipe (2) from a deaerator (1), then a water feeding pump (3) is used for pumping the water feeding pipe, a water feeding flow regulating valve (4) is used for regulating the flow of the water feeding, when the thermal power generating set needs to lift the load, the opening degree of the water feeding flow regulating valve is increased, the flow of the water feeding is increased, when the thermal power generating set needs to reduce the load, the opening degree of the water feeding flow regulating valve is reduced, the flow of the water feeding is reduced, and finally the water feeding enters a heating surface system; sampling and analyzing the oxygen content of the feed water at an oxygen content measuring and sampling port (6) in front of the inlet of the heating surface system, feeding an analysis result back to an oxygen adding water flow controller (9) by an oxygen content measuring instrument (8), feeding a control signal back to an oxygen adding water flow regulating valve (11) by the oxygen adding water flow controller (9) according to the oxygen content analysis result to accurately control the flow of the oxygen adding water, feeding the oxygen adding water into a breathable film oxygen adding tank (12) for oxygen adding, and adding the oxygen adding water into a feed water pipeline through an oxygen adding point (13) after the oxygen adding water reaches a saturated concentration;
step three: before the operation of the thermal power generating unit is stopped, the water supply and oxygen addition need to be finished in advance; feed water enters a deaerator downcomer (2) from a deaerator (1), then a feed water pump (3) is used for pumping the feed water into a feed water pipeline, a feed water flow regulating valve (4) is used for regulating the feed water flow, an oxygenation water flow controller (9) sends a control signal to gradually reduce the opening degree of an oxygenation water flow regulating valve (11), the oxygenation water flow is controlled until the opening degree is zero, oxygenation control is finished, and the feed water finally enters a heating surface system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111101925.1A CN113651435A (en) | 2021-09-18 | 2021-09-18 | Self-response unpowered breathable film oxygen increasing, water supplying and oxygen adding device and method |
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