CN108558030B - Automatic water supply oxygenation system and method - Google Patents
Automatic water supply oxygenation system and method Download PDFInfo
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- CN108558030B CN108558030B CN201810213715.3A CN201810213715A CN108558030B CN 108558030 B CN108558030 B CN 108558030B CN 201810213715 A CN201810213715 A CN 201810213715A CN 108558030 B CN108558030 B CN 108558030B
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- 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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- 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
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Abstract
The invention relates to an automatic water supply oxygenation system which comprises an adjustable power supply, a PID control module, an oxygen generator, an oxygenation assembly and a unit dissolved oxygen detection assembly, wherein the unit dissolved oxygen detection assembly is connected with a unit, the PID control module is respectively connected with the adjustable power supply and the unit dissolved oxygen detection assembly, the adjustable power supply is connected with the oxygen generator, and the oxygen generator is connected with the oxygenation assembly. The invention also relates to an automatic water supply oxygenation method, wherein the PID control module controls the adjustable power supply to output a corresponding current value to the oxygen generator according to the dissolved oxygen concentration signal detected by the unit dissolved oxygen detection component and the set target dissolved oxygen concentration signal, the oxygen generator generates a matched oxygen amount through electrolyzed water, and the generated oxygen is added into the unit water supply through the oxygenation component. The automatic oxygen adding device has the advantages of high automation degree, accurate oxygen adding control, no maintenance of equipment, labor saving and the like.
Description
Technical Field
The invention belongs to the field of boiler water treatment of power plants, and particularly relates to an electrolytic water-feeding automatic oxygenation system and method for a power plant.
Background
The boiler feed water treatment mode of the fire power plant for a long time mostly adopts a full-volatilization treatment mode, namely, ammonia water and hydrazine are added into furnace water, the furnace water is controlled to be alkaline, wherein the hydrazine has the function of removing trace oxygen in the feed water at the outlet of a deaerator, so that the feed water is in a reductive working condition, and the treatment mode is also called reductive full-volatilization treatment. If no hydrazine is added and a slight amount of oxygen remaining in the feed water remains, oxidative total-volatilization treatment is called. Under the working condition of full-volatilization treatment, the boiler pipeline is oxidized by high-temperature and high-pressure steam, and Fe with loose structure is formed on the surface of the inner wall3O4Layer of Fe formed on the inner wall of water supply pipe under the influence of flow accelerated corrosion3O4Is washed into the water wall, and finally causes the severe scaling of the water wall tube. The too high scale formation amount of the water wall can affect the boilerThe heat transfer efficiency can also cause water wall blockage and overheating and tube explosion on the other hand.
The water supply oxygenation treatment is an effective method for preventing and treating boiler scale damage in a thermal power plant. Adding a small amount of oxygen (generally 30-150 mug/L) into the feed water while adding ammonia to form a layer of compact F on the inner wall of the boiler pipeline2O3The oxide film is oxidized, thereby inhibiting the flow accelerated corrosion and radically relieving the damage of the oxide scale growth to the boiler. During the oxygen adding treatment, the currently commonly adopted oxygen adding mode is a gas steel cylinder type oxygen adding method, namely, an oxygen steel cylinder is used as a gas source, the oxygen adding device consisting of a pressure reducing valve, a flow control valve and the like is added into a descending pipe of a unit deaerator, and then the oxygen adding amount is controlled through an online instrument or a manual test of an economizer inlet and a starting separator (or steam drum) outlet. This method has a number of disadvantages: firstly, the existing oxygenation device is complex to operate, cannot realize on-line automatic dosing, and has large amount of manual labor; the second step is as follows: the existing oxygenation device falls behind, the oxygen addition amount is difficult to accurately control, and the real-time adjustment of the oxygen addition amount cannot be realized along with the fluctuation of the unit load; thirdly, oxygen is added into a water supply pipeline of the unit by the pressure in the gas steel cylinder, and the gas with certain pressure in the steel cylinder cannot be utilized, so that the waste of the oxygen is caused.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the technical problems that automatic and accurate control of oxygenation cannot be realized, oxygenation operation is complex, labor amount is large and the like in the prior art, the invention provides the automatic water supply oxygenation system and method capable of realizing accurate oxygenation control.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides an automatic oxygenation system of feedwater, includes adjustable power, PID control module, oxygen generator, oxygenation subassembly and unit dissolved oxygen detection spare, unit dissolved oxygen detection spare and unit connection, PID control module respectively with adjustable power the unit dissolved oxygen detection spare is connected, adjustable power with oxygen generator connects, oxygen generator with the oxygenation subassembly is connected, PID control module basis the dissolved oxygen concentration signal that unit dissolved oxygen detection spare detected and the target dissolved oxygen concentration signal of settlement control the corresponding current value of adjustable power output arrives oxygen generator, oxygen generator produces the oxygen volume of matcing through the brineelectrolysis, and the oxygen of production passes through the oxygenation subassembly is added into unit feedwater.
The above automatic water supply oxygenation system preferably has the oxygen generator and the oxygenation assembly connected through a connecting pipeline, the connecting pipeline is provided with a drying assembly, the connecting pipeline is provided with a first outlet check valve and/or the outlet pipeline of the oxygenation assembly is provided with a second outlet check valve.
In the above automatic water supply oxygenation system, preferably, the oxygenation assembly includes a plunger cavity, an oxygen inlet, an oxygen outlet, a piston, an intermittent piston pump capable of driving the piston to move in the plunger cavity, a first stroke limiter and a second stroke limiter for monitoring the position of the piston, the first stroke limiter and the second stroke limiter are mounted on the wall of the plunger cavity, the oxygen inlet is connected to the oxygen generator, the oxygen outlet is connected to the unit oxygenation point, when oxygen is introduced into the plunger cavity through the oxygen inlet, the piston moves under the pressure of the oxygen, when the piston reaches the position of the second stroke limiter, the intermittent piston pump starts and drives the piston to move toward the position of the first stroke limiter, so as to output the oxygen in the plunger cavity through the oxygen outlet, when the piston reaches the position of the first stroke limiter, the intermittent piston pump stops working, and the piston moves to the position of the second stroke limiter under the action of oxygen again.
In the above automatic water supply oxygenation system, preferably, the oxygenation assembly further comprises a movable plug, the movable plug is installed in the cavity of the oxygen inlet, and the movable plug is used for opening and closing the oxygen inlet under the action of gas pressure. When to when plunger chamber lets in oxygen, in the oxygen income locular cavity portable stopper is opened by the jack-up under the pressure effect of oxygen, and oxygen gets into in the plunger chamber, when oxygen passes through when oxygen goes out the accent output, portable stopper is in under the gas pressure effect in plunger intracavity portion will portable stopper compresses tightly to the cavity outside, closes oxygen income accent.
In the above automatic water supply oxygenation system, preferably, the oxygenation assembly further comprises a pressure release valve, the pressure release valve is arranged on the plunger cavity, and the pressure release valve is communicated with the plunger cavity. The plunger cavity is decompressed through the decompression valve.
In the above automatic water supply oxygenation system, preferably, the automatic oxygenation system further includes a DCS controller, and the DCS controller is connected to the first stroke limiter, the second stroke limiter, the intermittent piston pump, and the pressure release valve, respectively, and when the second stroke limiter detects the piston, feeds a signal back to the DCS controller, and the DCS controller sends a signal to start the intermittent piston pump; and when the first stroke limiter detects the piston, feeding a signal back to the DCS controller, sending a signal by the DCS controller to stop the intermittent piston pump, and sending a signal to open the pressure release valve and close the pressure release valve in a delayed manner.
The above automatic feedwater oxygenation system, preferably, said oxygen generator comprises: the hydrogen production port is arranged on the electrolytic cell, the oxygen production port is connected with the oxygen adding assembly, and the cathode and the anode are connected with the adjustable power supply.
Foretell automatic oxygen system that adds of feedwater, preferably, oxygen generator still includes level sensor, moisturizing solenoid valve, level sensor the moisturizing solenoid valve is located on the electrolysis trough, just level sensor the moisturizing solenoid valve all with the DCS controller is connected, just the DCS controller basis signal that level sensor carried controls the automatic moisturizing of realization of opening and shutting of moisturizing solenoid valve.
As a general inventive concept, the invention also discloses a feedwater automatic oxygenation method based on the feedwater automatic oxygenation system, which comprises the following steps:
s1, starting the adjustable power supply; the oxygen generator, the PID control module and the unit dissolved oxygen detection component are in working states; inputting a set oxygenation target concentration signal to the PID control module;
s2, the unit dissolved oxygen detection component detects the dissolved oxygen concentration in the unit and feeds the dissolved oxygen concentration signal back to the PID control module;
s3, the PID control module calculates according to a set oxygen adding target concentration signal and a detected dissolved oxygen concentration signal, and controls and adjusts the current value output by the adjustable power supply to the oxygen generator according to the calculation result to control the oxygen production amount of the oxygen generator;
s4, conveying the generated oxygen to a unit to realize oxygenation;
s5, keeping the steps of S2-S4 to circulate.
As a general inventive concept, the invention also discloses a feedwater automatic oxygenation method based on the feedwater automatic oxygenation system, which comprises the following steps:
when oxygen is introduced into the plunger cavity, the piston moves to the position of the second stroke limiter under the pressure action of the oxygen, when the second stroke limiter detects the piston, a signal is fed back to the DCS controller, and the DCS controller sends a signal to start the intermittent piston pump; the piston moves to the position of a first stroke limiter under the driving action of the intermittent piston pump, oxygen in the plunger cavity is added into unit feed water, when the first stroke limiter detects the piston, a signal is fed back to the DCS controller, the DCS controller sends a signal to stop the intermittent piston pump and sends a signal to open the pressure release valve and close the pressure release valve in a delayed manner;
when the liquid level sensor detects that the liquid level of the electrolyte drops to a low liquid level L1, a signal is transmitted to the DCS controller, the DCS controller sends a command to open a water replenishing electromagnetic valve, and water is automatically added through the water replenishing electromagnetic valve; and when the liquid level sensor detects that the liquid level of the electrolyte rises to a high liquid level H1, transmitting a signal to the DCS controller, and sending an instruction to close the water supplementing electromagnetic valve by the DCS controller.
The invention generates oxygen by electrolyzing pure water, the current of the electrolytic bath is interlocked with the content of dissolved oxygen in water at the outlet of the boiler, and the adding amount of oxygen is controlled by adjusting the electrolytic current, thereby realizing the automatic and accurate control of water supply and oxygen addition.
Compared with the prior art, the invention has the advantages that:
1. the invention can automatically adjust the current of the electrolysis device according to the feedback of the unit online dissolved oxygen detection component and the set dissolved oxygen target value, realize the automatic adjustment of the oxygen addition amount of the unit by accurately controlling the oxygen production amount, and finally realize the automatic and accurate oxygen addition of the unit; in addition, the invention prepares oxygen by electrolyzing water, replaces the traditional steel cylinder gas source, and the electrolysis device is basically maintenance-free, thereby avoiding the tedious labor of transportation, carrying, replacing the gas cylinder and the like and effectively saving the labor cost.
2. According to the invention, the oxygen prepared by electrolysis is added into the water supply pipeline of the unit by adopting the special piston oxygen adding assembly, the single oxygen adding amount of the oxygen adding device can adjust the positions of the first stroke limiter and the second stroke limiter according to the field requirement, so that the problems that the unit water supply dissolved oxygen greatly fluctuates due to the single oxygen adding amount being too large or the unit water supply dissolved oxygen cannot reach the target value due to the single oxygen adding amount being too small can be effectively avoided, the oxygen adding amount is stable, the fluctuation is small, and the stable oxygen adding control of the unit is realized.
3. The automatic oxygen adding system realizes the automatic control of the single oxygen adding amount of the oxygen adding assembly through the control assembly combined with the stroke limiter, the intermittent piston pump and the pressure relief electromagnetic valve.
4. The special piston oxygenation assembly is adopted, and the movable plug and the pressure relief solenoid valve which are arranged in the plunger cavity inlet are combined with other parts of the piston oxygenation assembly, so that oxygen can be almost completely utilized in each oxygenation process, no gas is remained, and the utilization rate of the oxygen and the accuracy of single oxygenation control are effectively improved.
5. The automatic oxygenation system of the invention realizes automatic replenishment of water consumed by electrolysis to the oxygen generator by combining the control assembly with the liquid level monitoring assembly and the water replenishing valve without manual intervention.
6. The automatic oxygenation system of the invention simultaneously realizes the control of the single oxygenation of the oxygenation component and the automatic replenishment of water consumed by electrolysis of the oxygen generator through one controller.
Drawings
FIG. 1 is a schematic view of an automatic feedwater oxygenation system according to an embodiment of the present invention.
The designations in fig. 1 indicate:
01. an adjustable DC power supply; 02. a PID control module; 03. an oxygen generator; 31. an electrolytic cell; 32. a hydrogen-producing port; 33. an oxygen producing port; 34. a cathode plate; 35. an anode plate; 36. an electrolyte; 37. a diaphragm; 38. an ultrasonic liquid level meter; 39. a water replenishing electromagnetic valve; 04. a plunger type automatic aerator; 41. an intermittent piston pump; 42. a piston; 43. a lower ultrasonic stroke limiter; 44. an upper ultrasonic stroke limiter; 45. a plunger cavity; 46. a mobile conical plug; 47. an oxygen inlet; 48. an oxygen outlet; 49. a pressure relief solenoid valve; 05. an oxygen dryer; 06. a dryer outlet check valve; 07. a plunger outlet check valve; 08. a DCS controller; 09. machine set dissolved oxygen detects piece.
Detailed Description
The invention is further described below with reference to the drawings and specific preferred embodiments of the description, without thereby limiting the scope of protection of the invention.
System embodiment
The embodiment discloses an electrolytic water supply automatic oxygenation system of a power plant, which is shown in figure 1 and comprises an adjustable direct-current power supply 01, a PID control module 02, an oxygen generator 03, a plunger type automatic oxygenator 04, an oxygen dryer 05, a dryer outlet check valve 06, a plunger outlet check valve 07, a piston pump DCS controller 08 and an online dissolved oxygen meter 09. The oxygen generator 03 comprises an electrolytic cell 31, a hydrogen production port 32, an oxygen production port 33, a cathode plate 34, an anode plate 35, an electrolyte 36, a diaphragm 37, an ultrasonic liquid level meter 38 and a water replenishing electromagnetic valve 39. The plunger type automatic aerator 04 consists of an intermittent piston pump 41, a piston 42, a lower ultrasonic stroke limiter 43, an upper ultrasonic stroke limiter 44, a plunger cavity 45, a movable conical plug 46, an oxygen inlet cavity port 47, an oxygen outlet cavity port 48 and a pressure relief solenoid valve 49. The adjustable DC power supply 01 is connected with the PID control module 02 through a signal cable. The cathode plate 34 and the anode plate 35 are respectively connected with the anode and the cathode of the adjustable direct current power supply 01 through leads. The hydrogen-producing port 32 is connected with a pipeline to the outside of the factory building to discharge the hydrogen generated by electrolysis. The oxygen generating port 33 is connected with the oxygen inlet cavity port 47 through a pipeline, and an oxygen dryer 05 and a dryer outlet check valve 06 are sequentially connected on the pipeline. A movable conical plug 46 is mounted in the cavity of the oxygen inlet port 47. The oxygen outlet 48 is connected to the unit oxygenation point through a pipeline, and a plunger outlet check valve 07 is connected to the outlet pipeline at the outlet. The lower ultrasonic stroke limiter 43 and the upper ultrasonic stroke limiter 44 are respectively attached to the outer wall of the plunger cavity 45 and the positions of the two can be adjusted. The piston 42 is mechanically connected with the intermittent piston pump 41, and the intermittent piston pump 41 drives the piston 42 to reciprocate in the plunger cavity. The ultrasonic liquid level meter 38, the water replenishing electromagnetic valve 39, the intermittent piston pump 41, the lower ultrasonic stroke limiter 43, the upper ultrasonic stroke limiter 44 and the pressure relief electromagnetic valve 49 are connected with a DCS controller 08 through cables.
In this embodiment, the adjustable dc power supply 01 is a commercially available dc power supply, can output dc power of 10V to 100V and 1A to 100A, has a control signal input interface, and can receive an external control current signal and adjust an output current.
In this embodiment, the adjustable PID control module 02 is a common controller sold in the market, and has a function of receiving an external input current signal, performing mathematical calculation, and finally outputting a control current signal. The interface of the PID control module 02 is provided with a digital key and a display screen, and a target value of the unit dissolved oxygen control can be manually input.
In this embodiment, the DCS controller 08 is a commercially available controller that can receive an external DI signal and output a DO signal.
In the embodiment, the cathode plate 34 and the anode plate 35 are electrodes with porous surfaces made of nickel-plated carbon steel, and the porous structures on the surfaces can increase the specific surface area of the electrodes and increase the efficiency of oxygen generation by electrolysis. The electrolyte 36 is a potassium hydroxide solution with the mass percentage of 30 +/-3 percent, which is prepared by high-purity water (the conductivity is less than or equal to 0.2 mu S/cm) and high-grade pure potassium hydroxide solid. The diaphragm 37 is made of asbestos or a material having an asbestos-like function, and functions to block the passage of gas while allowing the passage of ions and water.
In this embodiment, a dissolved oxygen target value is input into the interface of the PID control module 02, the adjustable dc power supply 01 is started, a voltage is applied between the cathode plate 34 and the anode plate 35, water is electrolyzed under the action of an electric field, hydrogen and oxygen are respectively precipitated on the cathode plate 34 and the anode plate 35, and the reaction is as follows:
cathode: 2H++2e→H2↓ (formula 1)
Anode: 4OH-+4e→O2↑+2H2O (formula 2)
In this embodiment, water consumed by electrolysis is supplemented through the water supplementing electromagnetic valve 39, when the ultrasonic liquid level meter 38 detects that the liquid level of the electrolyte 36 drops to the low liquid level L1, a signal is transmitted to the DCS controller 08, the DCS controller 08 sends out a command again to open the water supplementing electromagnetic valve 39, the liquid level rises to the high liquid level H1 and then is closed, and the low liquid level L1 and the high liquid level H1 are liquid level values set and stored in the DCS controller.
In this embodiment, the hydrogen generated by the cathode is discharged to the atmosphere outside the plant through the discharge pipe from the hydrogen generation port 32. Oxygen generated by the anode flows out of the electrolytic cell 31 from the oxygen generating port 33, enters the oxygen dryer 05 for dehydration and drying, passes through the dryer outlet check valve 06, backs up the movable conical plug 46, and enters the plunger cavity 45 from the oxygen inlet port 47. The oxygen continuously accumulated in the plunger cavity 45 raises the pressure in the cavity, the piston 42 is pushed downwards, and when the piston 42 reaches the position of the lower ultrasonic stroke limiter 43, the DCS controller 08 sends a signal to start the intermittent piston pump 41 to add the oxygen in the cavity into a water supply pipeline of the unit through the oxygen outlet cavity 48 and the plunger outlet check valve 07 in sequence. When the intermittent piston pump 41 drives the piston 42 to add oxygen, the positive pressure in the plunger cavity 45 presses the movable conical plug 46 to the outer side of the cavity, and the oxygen inlet 47 is closed to prevent the oxygen from flowing back to the electrolytic cell 31 through the pipeline. When the piston 42 reaches the position of the upper ultrasonic stroke limiter 44, the DCS controller 08 sends a signal to stop the intermittent piston pump 41, and at the same time, opens the pressure relief solenoid valve 49 and automatically closes with a delay of 1 s. At this point the pressure in the plunger chamber 45 is reduced and oxygen in the cell 31 pushes the movable conical plug 46 open into the plunger chamber 45 to begin the next oxygenation cycle. The dryer outlet check valve 05 and the plunger outlet check valve 06 function to prevent oxygen from back flushing in the opposite direction.
In this embodiment, oxygen added to the water supply pipeline of the unit is dissolved in water and detected by the on-line dissolved oxygen meter 09 of the unit, the detected dissolved oxygen concentration is transmitted and input to the PID control module 02, and according to the set target value of the oxygen concentration, the PID control module 02 automatically calculates and sends an instruction to the adjustable dc power supply 01 to adjust the output current of the adjustable dc power supply 01. The oxygen production amount of the oxygen generator 03 is changed by the current of the electrolytic cell 31, and the larger the current is, the higher the oxygen production amount is, and the oxygen amount finally added into the system is also increased. By the control mode, automatic control of the unit for supplying water and oxygen can be realized.
In this embodiment, the positions of the lower ultrasonic travel limiter 43 and the upper ultrasonic travel limiter 44 are movable, and the distance between the lower ultrasonic travel limiter and the upper ultrasonic travel limiter can be manually adjusted according to the demand of on-site oxygen addition, so that the size of single oxygen addition can be adjusted.
Method embodiment
The embodiment discloses an automatic oxygenation method for electrolytic feedwater of a power plant, which comprises the following steps:
(1) 10L of demineralized water was poured into a clean water tank, 4.30kg of high-grade pure KOH solid was weighed and slowly poured into the demineralized water, and the demineralized water was stirred with a clean metal rod while adding the KOH solid to accelerate the dissolution of the solid. After all the solids are dissolved, the electrolyte is injected into the electrolytic cell from the water-replenishing electromagnetic valve of the oxygen generator, and the preparation of the electrolyte is finished.
(2) The target value of the unit feed water dissolved oxygen concentration is input into the interface of the PID control module, the unit online dissolved oxygen meter displays that the feed water dissolved oxygen concentration is 6.04 mug/L, and the distance between the upper ultrasonic liquid level meter and the lower ultrasonic liquid level meter is set to be 18 cm. Starting the adjustable direct current power supply, wherein the output current is 27.1A, and the oxygen generator starts to electrolyze to prepare oxygen which is added into a water supply pipeline through the oxygenator.
In the oxygen adding process, when oxygen is introduced into the plunger cavity 45, the piston 42 moves towards the position of the lower ultrasonic stroke limiter 43 under the pressure of the oxygen, when the lower ultrasonic stroke limiter 43 detects the piston 42, a signal is fed back to the DCS controller 08, the DCS controller 08 sends a signal to start the intermittent piston pump 41, the intermittent piston pump 41 starts and drives the piston 42 to move towards the position of the upper ultrasonic stroke limiter 44, and the oxygen in the plunger cavity 45 is output through the oxygen outlet cavity 48 and added into the unit feed water; when the upper ultrasonic stroke limiter 44 detects the piston 42, a signal is fed back to the DCS controller 08, the DCS controller 08 sends a signal to stop the intermittent piston pump 41 and sends a signal to open the pressure relief electromagnetic valve 49 and close the pressure relief electromagnetic valve with a delay, and an oxygenation cycle is completed; and the rest is repeated, and the next oxygenation circulation is carried out. Meanwhile, along with the proceeding of the oxygenation process, the liquid level of the electrolyte in the electrolytic cell 31 is reduced under the electrolysis action, when the liquid level sensor 38 detects that the liquid level of the electrolyte is reduced to a low liquid level L1, a signal is transmitted to the DCS controller 08, the DCS controller 08 sends a command to open the water replenishing electromagnetic valve 39, and water is automatically added through the water replenishing electromagnetic valve 39; when the liquid level sensor 38 detects that the liquid level of the electrolyte rises to a high liquid level H1, a signal is transmitted to the DCS controller 08, the DCS controller 08 sends out a command to close the water replenishing electromagnetic valve 39, and the low liquid level L1 and the high liquid level H1 are liquid level values which are set and stored in the DCS controller 08.
After 34 minutes, the on-line oxygen dissolution meter of the unit showed that the feed water dissolved oxygen concentration was 51.7. mu.g/L, the dissolved oxygen concentration was 73.1. mu.g/L after 48 minutes, the dissolved oxygen concentration was 87.3. mu.g/L after 1 hour, and the electrolytic current was 12.7A. After 2 hours, the dissolved oxygen concentration was 78.4. mu.g/L, and the electrolytic current was 14.3A. Thereafter, the dissolved oxygen concentration fluctuated substantially within the range of 80. + -. 7. mu.g/L.
(3) According to the requirement on the stability of single oxygen addition, the distance between the upper ultrasonic liquid level meter and the lower ultrasonic liquid level meter is adjusted to 15cm from 18cm, the fluctuation range of the dissolved oxygen is reduced after 1 hour, and the dissolved oxygen concentration basically fluctuates within the range of 80 +/-4 mu g/L after about 2 hours.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (10)
1. An automatic water supply oxygenation system is characterized by comprising an adjustable power supply (01), a PID control module (02), an oxygen generator (03), an oxygenation assembly (04) and a unit dissolved oxygen detection assembly (09), wherein the unit dissolved oxygen detection assembly (09) is connected with a unit, the PID control module (02) is respectively connected with the adjustable power supply (01) and the unit dissolved oxygen detection assembly (09), the adjustable power supply (01) is connected with the oxygen generator (03), the oxygen generator (03) is connected with the oxygenation assembly (04), the PID control module (02) controls the adjustable power supply (01) to output a corresponding current value to the oxygen generator (03) according to a dissolved oxygen concentration signal detected by the unit dissolved oxygen detection assembly (09) and a set target dissolved oxygen concentration signal, the oxygen generator (03) generates a matched oxygen amount through electrolyzed water, the generated oxygen is added into the unit feed water through the oxygenation component (04); the oxygenation assembly (04) comprises a plunger cavity (45), an oxygen inlet cavity opening (47), an oxygen outlet cavity opening (48), a piston (42), an intermittent piston pump (41) capable of driving the piston (42) to move in the plunger cavity (45), a first stroke limiter (44) and a second stroke limiter (43) for monitoring the position of the piston (42), wherein the first stroke limiter (44) and the second stroke limiter (43) are mounted on the wall of the plunger cavity (45), the oxygen inlet cavity opening (47) is connected with the oxygen generator (03), and the oxygen outlet cavity opening (48) is connected with a unit oxygenation point; the oxygenation assembly (04) further comprises a movable plug (46), and the movable plug (46) is installed in a cavity of the oxygen inlet (47).
2. The automatic feedwater oxygenation system of claim 1, wherein said oxygen generator (03) is connected to said oxygenation assembly (04) by a connecting line, said connecting line having a drying assembly (05) thereon, said connecting line having a first outlet check valve (06) thereon and/or said oxygenation assembly (04) having a second outlet check valve (07) thereon.
3. The automatic water-feeding and oxygen-adding system as claimed in claim 1 or 2, characterized in that when oxygen is fed into the plunger cavity (45) through the oxygen inlet cavity port (47), the piston (42) moves under the pressure of the oxygen, when the piston (42) reaches the position of the second stroke limiter (43), the intermittent piston pump (41) is started and drives the piston (42) to move towards the position of the first stroke limiter (44), the oxygen in the plunger cavity (45) is output through the oxygen outlet cavity port (48), when the piston (42) reaches the position of the first stroke limiter (44), the intermittent piston pump (41) stops working, and the piston (42) moves towards the position of the second stroke limiter (43) under the action of the oxygen again.
4. The automatic feedwater oxygenation system of claim 1 or 2, wherein said movable plug (46) effects opening and closing of said oxygen inlet port (47) under gas pressure.
5. The automatic feedwater oxygenation system of claim 1 or 2, wherein said oxygenation assembly (04) further comprises a pressure relief valve (49), said pressure relief valve (49) being disposed on said plunger cavity (45), and said pressure relief valve (49) being in communication with said plunger cavity (45).
6. The automatic water-feeding and oxygen-adding system as claimed in claim 5, characterized in that the automatic oxygen-adding system further comprises a DCS controller (08), and the DCS controller (08) is respectively connected with the first stroke limiter (44), the second stroke limiter (43), the intermittent piston pump (41) and the pressure relief valve (49), and feeds back a signal to the DCS controller (08) when the second stroke limiter (43) detects the piston (42), and the DCS controller (08) sends a signal to start the intermittent piston pump (41); when the first stroke limiter (44) detects the piston (42), a signal is fed back to the DCS controller (08), the DCS controller (08) sends a signal to stop the intermittent piston pump (41), and the signal is sent to open the pressure release valve (49) and is closed in a delayed mode.
7. The automatic water-feeding and oxygen-adding system as claimed in claim 6, wherein the oxygen generator (03) comprises an electrolytic cell (31), a hydrogen-producing port (32), an oxygen-producing port (33), a cathode (34), an anode (35), an electrolyte (37) and a diaphragm (38), the hydrogen-producing port (32) and the oxygen-producing port (33) are arranged on the electrolytic cell (31), the oxygen-producing port (33) is connected with the oxygen-adding component (04), and the cathode (34) and the anode (35) are connected with the adjustable power supply (01).
8. The automatic water-feeding and oxygen-adding system of claim 7, characterized in that the oxygen generator (03) further comprises a liquid level sensor (38) and a water-adding electromagnetic valve (39), the liquid level sensor (38) and the water-adding electromagnetic valve (39) are arranged on the electrolytic tank (31), the liquid level sensor (38) and the water-adding electromagnetic valve (39) are both connected with the DCS controller (08), and the DCS controller (08) controls the opening and closing of the water-adding electromagnetic valve (39) according to a signal transmitted by the liquid level sensor (38) to realize automatic water adding.
9. An automatic feedwater oxygenation method based on the automatic feedwater oxygenation system according to any one of claims 5 to 8, characterized by comprising the steps of:
s1, starting an adjustable power supply (01); the oxygen generator (03), the PID control module (02) and the unit dissolved oxygen detection component (09) are in a working state; inputting a set oxygenation target concentration signal to the PID control module (02);
s2, the unit dissolved oxygen detection component (09) detects the dissolved oxygen concentration in the unit and feeds the dissolved oxygen concentration signal back to the PID control module (02);
s3, the PID control module (02) calculates according to a set oxygen adding target concentration signal and a detected dissolved oxygen concentration signal, and controls and adjusts the current value output by the adjustable power supply (01) to the oxygen generator (03) according to the calculation result to control the oxygen production amount of the oxygen generator (03);
s4, conveying the generated oxygen to a unit to realize oxygenation;
s5, keeping the steps from S2 to S4 to circulate;
when oxygen is introduced into the plunger cavity (45), the piston (42) moves to the position of the second stroke limiter (43) under the pressure action of the oxygen, when the second stroke limiter (43) detects the piston (42), a signal is fed back to the DCS controller (08), and the DCS controller (08) sends a signal to start the intermittent piston pump (41); piston (42) are in the position movement of first stroke stopper (44) under the drive effect of intermittent type formula piston pump (41), will oxygen in plunger chamber (45) adds the unit feedwater, works as first stroke stopper (44) detect when piston (42), feed back the signal to DCS controller (08), DCS controller (08) signals and stops intermittent type formula piston pump (41), and sends out the signal and opens relief valve (49) and time delay are closed.
10. The automatic feedwater oxygenation method of the automatic feedwater oxygenation system according to claim 8, comprising: when oxygen is introduced into the plunger cavity (45), the piston (42) moves to the position of the second stroke limiter (43) under the pressure action of the oxygen, when the second stroke limiter (43) detects the piston (42), a signal is fed back to the DCS controller (08), and the DCS controller (08) sends a signal to start the intermittent piston pump (41); the piston (42) moves to the position of a first stroke limiter (44) under the driving action of the intermittent piston pump (41), oxygen in the plunger cavity (45) is added into unit feed water, when the first stroke limiter (44) detects the piston (42), a signal is fed back to the DCS controller (08), the DCS controller (08) sends a signal to stop the intermittent piston pump (41), and sends a signal to open the pressure release valve (49) and close in a delayed mode;
when the liquid level sensor (38) detects that the liquid level of the electrolyte (37) is lowered to a low liquid level L1, a signal is transmitted to the DCS controller (08), the DCS controller (08) sends a command to open the water replenishing electromagnetic valve (39), and water is automatically added through the water replenishing electromagnetic valve (39); when the liquid level sensor (38) detects that the liquid level of the electrolyte (37) rises to a high liquid level H1, a signal is transmitted to the DCS controller (08), and the DCS controller (08) sends an instruction to close the water replenishing electromagnetic valve (39).
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