Active and passive combined passive oxygenating device

Abstract

The utility model discloses an active and passive combined passive oxygenating device which comprises a desalted water supply main pipe, a condensate pump, a water supply pipeline and a deaerator, an outlet of the desalted water supply mother pipe is divided into two paths, the first path is communicated with a condensate pump through a condenser water replenishing valve and a condenser, the second path is divided into two paths through an oxygen replenishing main valve, and one path is communicated with an inlet of the condensate pump through a condensate oxygen replenishing valve, a condensate oxygen replenishing flowmeter and a condensate oxygen replenishing automatic regulating valve in sequence. An outlet of the water supply pipeline is divided into two paths, one path is communicated with a pipeline between the condensed water oxygen supplementing flowmeter and the condensed water oxygen supplementing automatic regulating valve through a communicating valve, and the other path is communicated with an outlet of the water supply pipeline through a communicating valve; and the other path is communicated with an outlet water supply downcomer of the deaerator through an automatic water supply and oxygen supplementation regulating valve, a primary water supply and oxygen supplementation valve and a secondary water supply and oxygen supplementation valve in sequence. The device can realize safe and reliable oxygen supplementation.

Description

Technical Field

[0001] The utility model belongs to the technical field of water supply and oxygenation, and relates to a passive oxygen supplement device combining active and passive functions. Background Art

[0002] As one of the most advanced feed water treatment processes for DC units, feed water oxygenation can form a dense oxide protective layer on the inner wall of the pipeline, thereby effectively reducing the corrosion and scaling rate of thermal equipment, reducing the frequency of chemical cleaning, and extending the fine treatment operation cycle, saving power plant operation and maintenance costs, and improving the economic efficiency of the power plant.

[0003] The most commonly used oxygenation methods for feed water are pure oxygen, air, and oxygen-enriched water. When the system pressure fluctuates, gaseous oxygen such as pure oxygen or air is compressed in the oxygenation pipeline, and the oxygen injection volume will also fluctuate, making it difficult to achieve precise control of the oxygenation volume. This results in unstable control of the feed water oxygenation volume and may cause the feed water oxygen content to exceed the standard. The liquid oxygen-enriched water oxygenation medium has the characteristic of being incompressible. When the system pressure fluctuation causes the pressure change at the oxygenation point, the liquid is almost incompressible, so the oxygenation volume at the oxygenation point is relatively stable compared to the gaseous state. However, there is a high concentration of dissolved oxygen in the oxygen-enriched water. When the unit needs to control the oxygen content within a low range, even a slight fluctuation in the oxygen-enriched water flow rate may cause the oxygen content in the water to fluctuate beyond the allowable range.

[0004] In fact, the current oxygenation methods of pure oxygen or oxygen-enriched water both have the problem of exceeding the unit feed water oxygen standard due to changes in unit load or the system's own operational control stability. Especially under low-oxygen operating conditions, unexpected fluctuations can cause the feed water oxygen to exceed the standard by dozens of times. Excess oxygen entering the system may bring unexpected risks. This risk is incompatible with the safety concept of nuclear power units. Therefore, a relatively safer and more reliable oxygenation method is needed. Utility Model Content

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a passive oxygen supplement device that combines active and passive functions, which can achieve safe and reliable oxygenation.

[0006] To achieve the above-mentioned purpose, the utility model discloses a passive oxygen supply device combining active and passive functions, comprising a desalted water supply main pipe, a condensate pump, a water supply pipeline and a deaerator;

[0007] The outlet of the desalted water supply main pipe is divided into two routes, of which the first route is connected to the condensate pump through the condenser water supply valve and the condenser, and the second route is divided into two routes through the oxygen supply main valve, one of which is connected to the inlet of the condensate pump through the condensate oxygen supply valve, the condensate oxygen supply flowmeter and the condensate oxygen supply automatic regulating valve in sequence, and the other route is connected to the inlet of the water supply pipeline through the feed water oxygen supply valve. The outlet of the water supply pipeline is divided into two routes, one of which is connected to the pipeline between the condensate oxygen supply flowmeter and the condensate oxygen supply automatic regulating valve through the connecting valve, and the other route is connected to the outlet water supply downcomer of the deaerator through the feed water oxygen supply automatic regulating valve, the feed water oxygen supply primary valve and the feed water oxygen supply secondary valve in sequence.

[0008] Furthermore, the outlet of the desalted water supply main pipe is divided into two routes, wherein the first route is connected to the condenser water supply valve and the condenser and the condensate pump, and the second route is divided into two routes after passing through the oxygen supply main valve and the oxygen supply main pipe pressure sensor.

[0009] Furthermore, the outlet of the main oxygen supply valve is connected to the inlet of the condensate pump through the condensate oxygen supply valve, condensate oxygen supply pressure gauge, condensate oxygen supply flow meter, condensate oxygen supply automatic regulating valve, condensate oxygen supply manual regulating valve, condensate oxygen supply primary valve and condensate oxygen supply secondary valve.

[0010] Furthermore, the outlet of the water supply pipeline is connected to the outlet water supply downcomer of the deaerator through the water supply oxygen automatic regulating valve, water supply oxygen pressure gauge, water supply oxygen pressure sensor, water supply oxygen flow meter, water supply oxygen primary valve and water supply oxygen secondary valve.

[0011] Furthermore, the water supply pipeline is provided with an oxygen supplementation pump inlet valve, an oxygen supplementation pump, an oxygen supplementation pump outlet check valve and an oxygen supplementation pump outlet valve in sequence;

[0012] Furthermore, the water supply pipeline is connected in parallel with an oxygen supplementation pump recirculation valve.

[0013] Furthermore, the automatic regulating valve for water supply and oxygen supply is connected in parallel with a manual regulating valve for water supply and oxygen supply.

[0014] Furthermore, the condensate water oxygen supply automatic regulating valve is connected in parallel with the condensate water oxygen supply manual regulating valve.

[0015] Furthermore, the diameter of the condensate water oxygen supply automatic regulating valve is smaller than the diameter of the condensate water oxygen supply manual regulating valve.

[0016] Furthermore, the diameter of the automatic regulating valve for water supply and oxygen supply is smaller than the diameter of the manual regulating valve for water supply and oxygen supply.

[0017] The utility model has the following beneficial effects:

[0018] During operation, the passive oxygenation device, combining active and passive functions, operates with the condensate pump's inlet main pipe under negative pressure. This allows for controlled oxygenation of the condensate system through a passive method by simply connecting the desalted water supply main pipe to the condensate pump's inlet via a regulating valve. Alternatively, an oxygenation pump can be used to pressurize oxygenated water from the desalted water supply main pipe and inject it into the deaerator's outlet water supply downcomer, enabling active oxygenation of the water supply system, thereby achieving safe and reliable oxygenation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting part of the present invention are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 This is a structural diagram of the utility model.

[0021] Among them, 1 is the demineralized water supply main pipe, 2 is the condenser water supply valve, 3 is the condenser, 4 is the condensate pump, 5 is the oxygen supply main valve, 6 is the oxygen supply main pipe pressure sensor, 7 is the condensate oxygen supply valve, 8 is the condensate oxygen supply pressure gauge, 9 is the condensate oxygen supply flow meter, 10 is the condensate oxygen supply automatic regulating valve, 11 is the condensate oxygen supply manual regulating valve, 12 is the condensate oxygen supply primary valve, 13 is the condensate oxygen supply secondary valve, 14 is the water supply oxygen supply valve, 15 is the supply valve, Oxygen pump inlet valve, 16 is the oxygen supply pump, 17 is the oxygen supply pump outlet check valve, 18 is the oxygen supply pump outlet valve, 19 is the oxygen supply pump recirculation valve, 20 is the connecting valve, 21 is the water supply oxygen supply automatic regulating valve, 22 is the water supply oxygen supply manual regulating valve, 23 is the water supply oxygen supply pressure gauge, 24 is the water supply oxygen supply pressure sensor, 25 is the water supply oxygen supply flow meter, 26 is the water supply oxygen supply primary valve, 27 is the water supply oxygen supply secondary valve, 28 is the deaerator, and 29 is the control module. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be understood that the terms "include" and "comprise" indicate the existence of the described features, wholes, steps, operations, elements and / or components, but do not exclude the existence or addition of one or more other features, wholes, steps, operations, elements, components and / or their collections.

[0024] It should also be understood that the terms used in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in this specification and the appended claims, the singular forms "a", "an" and "the" are intended to include plural forms unless the context clearly indicates otherwise.

[0025] It should be further understood that the term "and / or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items. For example, A and / or B may represent: A alone, A and B simultaneously, or B alone. In addition, the character " / " in this specification generally indicates that the associated items are in an "or" relationship.

[0026] It should be understood that although the terms "first," "second," and "third" may be used in embodiments of the present invention to describe preset ranges, the preset ranges should not be limited to these terms. These terms are merely used to distinguish one preset range from another. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0027] The word "if," as used herein, may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to the determination" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)," depending on the context.

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the utility model for protection, but merely represents selected embodiments of the present invention. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] The accompanying drawings illustrate various schematic diagrams of structures according to embodiments disclosed herein. These figures are not drawn to scale; for clarity, some details are exaggerated and some details may be omitted. The shapes, relative sizes, and positional relationships of the various regions and layers shown in the figures are merely exemplary and may deviate in practice due to manufacturing tolerances or technical limitations. Those skilled in the art may design regions / layers with different shapes, sizes, and relative positions as needed.

[0030] refer to Figure 1 The passive oxygen supply device combining active and passive functions described in the present invention includes a desalted water supply main pipe 1, a condenser water supply valve 2, a condenser 3, a condensate pump 4, an oxygen supply main valve 5, an oxygen supply main pipe pressure sensor 6, a condensate water supply valve 7, a condensate water supply pressure gauge 8, a condensate water supply flow meter 9, a condensate water supply oxygen automatic regulating valve 10, a condensate water supply oxygen manual regulating valve 11, a condensate water supply oxygen primary valve 12, a condensate water supply oxygen secondary valve 13, Water supply oxygen supply valve 14, oxygen supply pump inlet valve 15, oxygen supply pump 16, oxygen supply pump outlet check valve 17, oxygen supply pump outlet valve 18, oxygen supply pump recirculation valve 19, connecting valve 20, water supply oxygen supply automatic regulating valve 21, water supply oxygen supply manual regulating valve 22, water supply oxygen supply pressure gauge 23, water supply oxygen supply pressure sensor 24, water supply oxygen supply flowmeter 25, water supply oxygen supply primary valve 26, water supply oxygen supply secondary valve 27, deaerator 28 and control module 29;

[0031] The outlet of the desalted water supply main pipe is divided into two routes, of which the first route is connected to the condensate pump 4 through the condenser water supply valve 2 and the condenser 3, and the second route is divided into two routes after passing through the oxygen supply main valve 5 and the oxygen supply main pipe pressure sensor 6. One route is connected to the inlet of the condensate pump 4 through the condensate oxygen supply valve 7, the condensate oxygen supply pressure gauge 8, the condensate oxygen supply flow meter 9, the condensate oxygen supply automatic regulating valve 10, the condensate oxygen supply manual regulating valve 11, the condensate oxygen supply primary valve 12 and the condensate oxygen supply secondary valve 13 in sequence. The other path is connected to the inlet of the water supply pipeline through the water supply oxygenation valve 14. The outlet of the water supply pipeline is divided into two paths, one of which is connected to the pipeline between the condensate water oxygenation flowmeter 9 and the condensate water oxygenation automatic regulating valve 10 through the connecting valve 20, and the other path is connected to the outlet water supply downcomer of the deaerator 28 through the water supply oxygenation automatic regulating valve 21, the water supply oxygenation pressure gauge 23, the water supply oxygenation pressure sensor 24, the water supply oxygenation flowmeter 25, the water supply oxygenation primary valve 26 and the water supply oxygenation secondary valve 27 in sequence.

[0032] The water supply pipeline is provided with an oxygen supplementation pump inlet valve 15, an oxygen supplementation pump 16, an oxygen supplementation pump outlet check valve 17 and an oxygen supplementation pump outlet valve 18 in sequence.

[0033] As an embodiment of the present invention, the water supply pipeline is connected in parallel with an oxygen pump recirculation valve 19 .

[0034] As an embodiment of the present invention, the automatic regulating valve 21 for water supply and oxygen supply is connected in parallel with the manual regulating valve 22 for water supply and oxygen supply.

[0035] As an embodiment of the present invention, the condensate water oxygen supply automatic regulating valve 10 is connected in parallel with the condensate water oxygen supply manual regulating valve 11 .

[0036] As an embodiment of the present invention, the installation position of the water supply oxygenation secondary valve 27 is close to the water supply downpipe of the deaerator 28. The number is determined according to the number of water supply pumps, and the typical number is 3 or 4.

[0037] As an implementation mode of the present invention, the diameter of the condensate water oxygen supply automatic regulating valve 10 is smaller than the diameter of the condensate water oxygen supply manual regulating valve 11.

[0038] As an implementation mode of the present utility model, the diameter of the automatic regulating valve 21 for water supply and oxygen supply is smaller than the diameter of the manual regulating valve 22 for water supply and oxygen supply.

[0039] As an embodiment of the present invention, the oxygen supplementation pump 16 is a power frequency or variable frequency multi-stage centrifugal pump.

[0040] As an embodiment of the present invention, the upstream pipelines and valves of the oxygen supplementation pump 16 are selected to have a pressure grade of 1.6 MPa, and the downstream pipelines, valves and instruments are selected to have a pressure grade of 2.5 MPa.

[0041] As an implementation mode of the present invention, the oxygen supplementation pump recirculation valve 19 is connected to the inlet and outlet main pipes of the oxygen supplementation pump 16 .

[0042] As an embodiment of the present invention, the control module 29 is a PLC module, and also has a communication function with the power plant DCS.

[0043] As an implementation mode of the present utility model, the control module 29 collects the status feedback signal of the oxygen supply pump 16, the pressure signals of the oxygen supply main pipe pressure sensor 6 and the water supply oxygen supply pressure sensor 24, the flow signals of the condensate water supply oxygen flowmeter 9 and the water supply oxygen flowmeter 25, the opening feedback signals of the condensate water supply oxygen automatic regulating valve 10 and the water supply oxygen automatic regulating valve 21, the oxygen content signal from the DCS, the condensate and feed water flow signals, and the hydrogen conductivity signals of the condensate and feed water.

[0044] The signals output by the control module 29 include at least: manual / automatic instructions for the oxygen supply pump 16, manual / automatic instructions for the condensate water oxygen supply automatic regulating valve 10 and the feed water oxygen supply automatic regulating valve 21, start and stop instructions for the oxygen supply pump 16, adjustment instructions for the condensate water oxygen supply automatic regulating valve 10 and the feed water oxygen supply automatic regulating valve 21, etc.

[0045] The dissolved oxygen in the unit's daily desalted water is used as the oxygen source. The unit's daily water replenishment rate is 0.5%-1.5%, and the actual dissolved oxygen content in the desalted water exceeds 8000 ppb, increasing the dissolved oxygen in the system water by 40-120 ppb, fully meeting the unit's oxidation operating requirements. Based on this reality, the unit's desalted water replenishment is used as the oxygen carrier. Desalted water containing dissolved oxygen is added to the inlet main pipe of condensate pump 4 and the downcomer of the feedwater pump. This not only meets the system's water replenishment needs, but also meets the unit's oxidation operating requirements.

[0046] The inlet main pipe of the condensate pump 4 is under negative pressure. Therefore, it is only necessary to connect the desalted water supply main pipe to the inlet of the condensate pump 4 through a regulating valve to controllably add oxygen to the condensate system in a passive manner. Active oxygenation can be added to the water supply system by using a water pump to pressurize the oxygenated water from the desalted water supply main pipe and inject it into the outlet water supply downcomer of the deaerator 28.

[0047] Those skilled in the art will readily conceive of other embodiments of the present invention after considering the specification and disclosure of the utility model. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered merely as exemplary; the true scope and spirit of the present invention are indicated by the following claims.

[0048] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0049] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A passive oxygen supplement device combining active and passive functions, characterized in that: It includes a desalted water supply main pipe, a condensate pump (4), a water supply pipeline and a deaerator (28); The outlet of the desalted water supply main pipe is divided into two routes, wherein the first route is connected to the condensate pump (4) via the condenser water supply valve (2) and the condenser (3), and the second route is divided into two routes via the oxygen supply main valve (5), wherein one route is connected to the inlet of the condensate pump (4) via the condensate oxygen supply valve (7), the condensate oxygen supply flow meter (9) and the condensate oxygen supply automatic regulating valve (10) in sequence, and the other route is connected to the inlet of the water supply pipeline via the water supply oxygen supply valve (14). The outlet of the water supply pipeline is divided into two routes, wherein one route is connected to the pipeline between the condensate oxygen supply flow meter (9) and the condensate oxygen supply automatic regulating valve (10) via the connecting valve (20), and the other route is connected to the outlet water supply downpipe of the deaerator (28) via the water supply oxygen supply automatic regulating valve (21), the water supply oxygen supply primary valve (26) and the water supply oxygen supply secondary valve (27) in sequence.

2. The active and passive combined oxygen supplement device according to claim 1, characterized in that: The outlet of the desalted water supply main pipe is divided into two routes, wherein the first route is connected to the condensate pump (4) through the condenser water supply valve (2) and the condenser (3), and the second route is divided into two routes after passing through the oxygen supply main valve (5) and the oxygen supply main pipe pressure sensor (6).

3. The active and passive combined oxygen supplement device according to claim 1, characterized in that: The outlet of the oxygen supply main valve (5) is connected to the inlet of the condensate pump (4) through the condensate oxygen supply valve (7), the condensate oxygen supply pressure gauge (8), the condensate oxygen supply flow meter (9), the condensate oxygen supply automatic regulating valve (10), the condensate oxygen supply manual regulating valve (11), the condensate oxygen supply primary valve (12) and the condensate oxygen supply secondary valve (13) in sequence.

4. The active and passive combined oxygen supplement device according to claim 1, characterized in that: The outlet of the water supply pipeline is connected to the outlet water supply downpipe of the deaerator (28) through the water supply oxygen supply automatic regulating valve (21), the water supply oxygen supply pressure gauge (23), the water supply oxygen supply pressure sensor (24), the water supply oxygen supply flow meter (25), the water supply oxygen supply primary valve (26) and the water supply oxygen supply secondary valve (27).

5. The active and passive combined oxygen supplement device according to claim 1, characterized in that: The water supply pipeline is sequentially provided with an oxygen supplementation pump inlet valve (15), an oxygen supplementation pump (16), an oxygen supplementation pump outlet check valve (17) and an oxygen supplementation pump outlet valve (18).

6. The active and passive combined oxygen supplement device according to claim 1, characterized in that: The water supply pipeline is connected in parallel with an oxygen supplement pump recirculation valve (19).

7. The active and passive combined oxygen supplement device according to claim 1, characterized in that: The water supply and oxygen supply automatic regulating valve (21) is connected in parallel with a water supply and oxygen supply manual regulating valve (22).

8. The active and passive combined oxygen supplement device according to claim 1, characterized in that: The condensate water oxygen supply automatic regulating valve (10) is connected in parallel with the condensate water oxygen supply manual regulating valve (11).

9. The active and passive combined oxygen supplement device according to claim 8, characterized in that: The diameter of the condensate water oxygen supply automatic regulating valve (10) is smaller than the diameter of the condensate water oxygen supply manual regulating valve (11).

10. The active and passive combined oxygen supplement device according to claim 7, characterized in that: The diameter of the automatic regulating valve (21) for water supply and oxygen supply is smaller than the diameter of the manual regulating valve (22) for water supply and oxygen supply.

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