Water supply and oxygen supplementation device for oxygen-source-free inherent safety evaporator and use method of water supply and oxygen supplementation device

Abstract

The invention discloses an oxygen-source-free inherent safety evaporator water supply and oxygen supplementation device and a using method, and belongs to the technical field of nuclear power units. The device comprises a condensed water pipeline, a condensed water oxygenating system and a water supply oxygenating system. A condenser is arranged on the condensed water pipeline; the inlet ends of the condensed water oxygenating system and the water supply oxygenating system are connected with a condensed water pipeline at one end of the condenser; the outlet end of the condensed water oxygenating system is connected with a condensed water pipeline at the other end of the condenser; the outlet end of the water supply and oxygen supplementation system is connected with the water supply system; the condensed water oxygen supplementing system comprises a condensed water oxygen supplementing main path and a condensed water oxygen supplementing branch path; the inlet end of the main condensed water oxygenating path is connected with a condensed water pipeline at one end of the condenser, and the outlet end of the main condensed water oxygenating path is connected to a condensed water pipeline at the other end of the condenser. The demineralized water consumption in the oxygenation conversion stage is reduced, accurate control over the oxygenation amount and the water supplementing amount is achieved, and the safety management burden and complexity of the nuclear power plant are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear power units, and in particular to an oxygen-free inherently safe evaporator water supply oxygen supply device and a use method thereof. Background Art

[0002] The DC evaporator water supply system adopts the water supply oxygenation treatment method, which can not only form a dense oxide film on the water supply pipeline and the inner wall of the evaporator, slow down the flow-accelerated corrosion rate of the water supply system and the condensate system, and effectively reduce the corrosion and scaling rate of the evaporator, but also eliminate the Fe3O4 deposition problem at the throttle valve of the evaporator heat transfer tube, reduce the pressure difference increase rate of the DC side evaporator of the nuclear power unit, and eliminate the temperature deviation between the tubes caused by the scaling of the throttle valve. At the same time, the water supply oxygenation treatment can also extend the fine treatment operation cycle and has good economic efficiency.

[0003] The most commonly used oxygenation methods for feed water are pure oxygen, compressed 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 amount will also fluctuate, making it difficult to achieve precise regulation of the oxygenation amount, resulting in unstable control of the feed water oxygenation amount, which may cause the feed water oxygen content to exceed the standard. The liquid oxygenation process is to fill the oxygen in the high-pressure oxygen cylinder into the pressure-resistant water tank, prepare oxygen-enriched water in the water tank, and then pump it into the feed water system through a high-pressure pump. This oxygenation method still uses high-pressure oxygen cylinders (generally above 10MPa, which are dangerous goods), and the pressure-resistant water tank belongs to the category of special equipment, which brings troubles to the safety management of nuclear power plants.

[0004] The publication number is CN210979797U, and its solution is to add condensate water to the feed water, so that the oxygen dissolved in the condensate water is brought into the water supply system, so that the oxygen concentration in the feed water meets the standard requirements. However, this method has the problem of a large amount of water replenishment. For example, when the water replenishment amount of the unit is low, too much condensate water replenishment will cause the water filling amount of the unit to be too high, and the excess water in the unit needs to be discharged. In addition, the unit requires a higher amount of oxygen during the oxygenation conversion stage, which means that more water replenishment needs to be added to the feed water.

[0005] Therefore, the existing nuclear power direct current unit evaporator oxygenation equipment needs to add oxygen through high-pressure oxygen cylinders or compressed air. During the unit's oxygenation conversion stage, the demand for oxygen is higher, which means that more make-up water is needed to bring in enough dissolved oxygen, further aggravating the problem of make-up water control, making it difficult to accurately control the amount of oxygen and make-up water, and increasing the safety management burden and complexity of nuclear power plants. Summary of the invention

[0006] The oxygenation equipment for evaporators of nuclear power direct current units in the prior art has the problem that it is difficult to accurately control the amount of oxygen and water replenishment, which increases the safety management burden and complexity of nuclear power plants. The present invention provides an oxygen-free inherently safe evaporator water supply oxygenation device, which uses desalted water dissolved with oxygen and air inhaled through a venturi device as the source of oxygen, avoids the use of high-pressure oxygen cylinders or compressed air, improves the inherent safety of the oxygenation equipment itself, controls the venturi device to increase the oxygen content of the desalted water, reduces the amount of desalted water used in the oxygenation conversion stage, and achieves accurate control of the amount of oxygen and water replenishment, reducing the safety management burden and complexity of nuclear power plants.

[0007] In order to achieve the above object, the present invention provides the following technical solutions.

[0008] In a first aspect, the present invention provides an oxygen-free source inherently safe evaporator water supply oxygen supply device, comprising a condensate water pipeline, a condensate water oxygen supply system and a water supply oxygen supply system; a condenser is arranged on the condensate water pipeline; the inlet ends of the condensate water oxygen supply system and the water supply oxygen supply system are connected to the condensate water pipeline at one end of the condenser; the outlet end of the condensate water oxygen supply system is connected to the condensate water pipeline at the other end of the condenser; the outlet end of the water supply oxygen supply system is connected to the water supply system; the condensate water oxygen supply system comprises a condensate water oxygen supply main circuit and a condensate water oxygen supply branch circuit; the inlet end of the condensate water oxygen supply main circuit is connected to the condensate water pipeline at one end of the condenser, and the outlet end of the condensate water oxygen supply main circuit is connected to the condensate water pipeline at the other end of the condenser. on the condensate water pipeline; the inlet end of the condensate water oxygen supply branch is connected to the inlet end of the condensate water oxygen supply main road, and the outlet end of the condensate water oxygen supply branch is connected to the outlet end of the condensate water oxygen supply main road; a condensate water oxygen supply Venturi device is provided on the condensate water oxygen supply branch; the water supply oxygen supply system includes a water supply oxygen supply main road and a water supply oxygen supply branch; the inlet end of the water supply oxygen supply main road is connected to the condensate water pipeline at one end of the condenser, and the outlet end of the water supply oxygen supply main road is connected to the deaerator; the inlet end of the water supply oxygen supply branch is connected to the inlet end of the water supply oxygen supply main road, and the outlet end of the water supply oxygen supply branch is connected to the outlet end of the water supply oxygen supply main road; a water supply oxygen supply Venturi device is provided on the water supply oxygen supply branch.

[0009] As a further improvement of the present invention, a condensate make-up electric valve and a condensate pump are also provided on the condensate pipeline; the condensate make-up electric valve is arranged on the condensate pipeline between the inlet end of the condensate oxygen supply main circuit and one end of the condenser; the condensate pump is arranged on the condensate pipeline between the outlet end of the condensate oxygen supply system and the other end of the condenser.

[0010] As a further improvement of the present invention, the condensate water oxygen supply main circuit includes a condensate water oxygen supply inlet valve, a condensate water oxygen supply main circuit flow meter, a condensate water oxygen supply main circuit flow regulating valve and a condensate water oxygen supply outlet valve; the condensate water oxygen supply inlet valve is arranged in the inlet end area of ​​the condensate water oxygen supply main circuit; the condensate water oxygen supply outlet valve is arranged in the outlet end area of ​​the condensate water oxygen supply main circuit; the condensate water oxygen supply main circuit flow meter is arranged between the condensate water oxygen supply inlet valve and the condensate water oxygen supply outlet valve; the condensate water oxygen supply main circuit flow regulating valve is arranged between the condensate water oxygen supply main circuit flow meter and the condensate water oxygen supply outlet valve.

[0011] As a further improvement of the present invention, the inlet end of the condensate water oxygen supply branch is connected between the condensate water oxygen supply inlet valve and the condensate water oxygen supply main flow meter; the outlet end of the condensate water oxygen supply branch is connected between the condensate water oxygen supply main flow regulating valve and the condensate water oxygen supply outlet valve.

[0012] As a further improvement of the present invention, the condensate water oxygen supply branch is also provided with a condensate water oxygen supply branch flowmeter and a condensate water oxygen supply branch flow regulating valve; the condensate water oxygen supply branch flowmeter is arranged at the inlet end of the condensate water oxygen supply branch; the condensate water oxygen supply Venturi device is arranged at the outlet end of the condensate water oxygen supply branch; the condensate water oxygen supply branch flow regulating valve is arranged between the condensate water oxygen supply branch flowmeter and the condensate water oxygen supply Venturi device.

[0013] As a further improvement of the present invention, the suction end of the condensate oxygen supply Venturi device is provided with a condensate oxygen supply Venturi pressure transmitter, a condensate oxygen supply air flow regulating valve and a condensate oxygen supply air flow meter.

[0014] As a further improvement of the present invention, the water supply and oxygen supply main circuit includes a water supply and oxygen supply inlet valve, a water supply and oxygen supply pump, a water supply and oxygen supply main circuit flow meter and a water supply and oxygen supply main circuit flow regulating valve; the water supply and oxygen supply inlet valve is arranged at the inlet end of the water supply and oxygen supply main circuit; the water supply and oxygen supply main circuit flow regulating valve is arranged at the outlet end of the water supply and oxygen supply main circuit; the water supply and oxygen supply main circuit flow meter is arranged between the water supply and oxygen supply inlet valve and the water supply and oxygen supply main circuit flow regulating valve; the water supply and oxygen supply main circuit outlet is connected to a deaerator; the inlet end of the water supply and oxygen supply branch circuit is connected between the water supply and oxygen supply pump and the water supply and oxygen supply main circuit flow meter; the outlet end of the water supply and oxygen supply branch circuit is connected to the deaerator.

[0015] As a further improvement of the present invention, the water supply oxygen supply branch is also provided with a water supply oxygen supply branch flow meter and a water supply oxygen supply branch flow regulating valve; the water supply oxygen supply branch flow meter is arranged at the inlet end of the water supply oxygen supply branch; the water supply oxygen supply Venturi device is arranged at the outlet end of the water supply oxygen supply branch; the water supply oxygen supply branch flow regulating valve is arranged between the water supply oxygen supply branch flow meter and the water supply oxygen supply Venturi device.

[0016] As a further improvement of the present invention, the suction end of the water supply and oxygen supply Venturi device is provided with a water supply and oxygen supply Venturi pressure transmitter, a water supply and oxygen supply air flow regulating valve and a water supply and oxygen supply air flow meter.

[0017] In a second aspect, the present invention provides a method for using an oxygen-free inherently safe evaporator water supply oxygen supply device, comprising: Under normal operating conditions of the unit, condensate enters the condensate system through the condenser in the condensate pipeline; desalted water containing oxygen enters the condensate system through the condensate oxygen supply main line in the condensate oxygen supply system; at the same time, desalted water containing oxygen enters the water supply system through the water supply oxygen supply main line in the water supply oxygen supply system; at this time, the condensate oxygen supply branch and the water supply oxygen supply branch are closed; when the unit water supply amount is low or the oxygen consumption needs to be increased during the oxygenation conversion stage, the condensate oxygen supply branch and the water supply oxygen supply branch are opened; desalted water containing oxygen enters the condensate system through the condensate oxygen supply branch, and at the same time, the condensate oxygen supply Venturi device is used to adjust the dissolved oxygen content in the desalted water; desalted water containing oxygen enters the water supply system through the water supply oxygen supply branch, and at the same time, the water supply oxygen supply Venturi device is used to adjust the dissolved oxygen content in the desalted water.

[0018] Compared with the prior art, the present invention has the following beneficial effects: The present invention avoids the use of high-pressure oxygen cylinders or compressed air by using desalted water with oxygen dissolved therein and air sucked by a venturi device as the source of oxygen. Not only does it reduce potential safety hazards, such as the risk of high-pressure gas leakage, but it also simplifies the system structure, thereby improving the inherent safety of the entire oxygenation equipment. Secondly, by controlling the venturi device, the oxygen content of the desalted water can be accurately adjusted, thereby achieving accurate control of the amount of oxygen added. At the same time, since the amount of desalted water required in the oxygenation conversion stage is reduced, accurate control of the amount of water replenishment is also achieved. This precise control helps to maintain the stability of the water quality in the evaporator and improve the operating efficiency and safety of the nuclear power plant. Since accurate control of the amount of oxygen added and the amount of water replenishment is achieved, the possibility of human operating errors is reduced, thereby reducing the safety management burden of the nuclear power plant. In addition, the simplification of the system structure also reduces the complexity and cost of maintenance and improves the overall economy. The present invention reduces unnecessary energy consumption by optimizing the oxygenation and water replenishment processes, such as reducing the energy wasted due to excessive water replenishment or oxygenation. This helps to improve the overall energy utilization efficiency of the nuclear power plant and meets the requirements of sustainable development. The device of the present invention is flexible in design and can be adjusted and optimized according to the actual operating requirements of the nuclear power plant. For example, by adjusting the working parameters of the Venturi device, it is possible to adapt to the oxygenation and water replenishment needs under different working conditions, thereby enhancing the adaptability and flexibility of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are for explanation purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. In the drawings: Figure 1 The present invention is an overall schematic diagram of an oxygen-free inherently safe evaporator water supply and oxygen supply device.

[0020] In the figure: 10 is the condensate water replenishment electric valve; 11 is the condenser; 12 is the condensate pump; 13 is the deaerator; 20 is the condensate water replenishment oxygen inlet valve; 21 is the condensate water replenishment oxygen main flow meter; 22 is the condensate water replenishment oxygen main flow regulating valve; 23 is the condensate water replenishment oxygen branch flow meter; 24 is the condensate water replenishment oxygen branch flow regulating valve; 25 is the condensate water replenishment oxygen Venturi device; 26 is the condensate water replenishment oxygen Venturi pressure transmitter; 27 is the condensate water replenishment oxygen air flow regulating valve; 2 8 is a condensate water oxygen supply air flow meter; 29 is a condensate water oxygen supply outlet valve; 30 is a water supply oxygen supply inlet valve; 31 is a water supply oxygen supply pump; 32 is a water supply oxygen supply main flow meter; 33 is a water supply oxygen supply main flow regulating valve; 34 is a water supply oxygen supply branch flow meter; 35 is a water supply oxygen supply branch flow regulating valve; 36 is a water supply oxygen supply Venturi device; 37 is a water supply oxygen supply Venturi pressure transmitter; 38 is a water supply oxygen supply air flow regulating valve; 39 is a water supply oxygen supply air flow meter. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solutions in the present invention, 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 only 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 creative work should fall within the scope of protection of the present invention.

[0022] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0024] With regard to the oxygenation equipment for the evaporator of nuclear power direct current units existing in the prior art, it is difficult to accurately control the amount of oxygen and water added, which increases the safety management burden and complexity of the nuclear power plant.

[0025] like Figure 1 As shown, the present invention provides an oxygen-free inherently safe evaporator water supply oxygen replenishment device, which includes: a condensate pipeline, a condensate oxygen replenishment system and a water supply oxygen replenishment system.

[0026] A condenser 11 is provided on the condensate pipeline.

[0027] The inlet ends of the condensate oxygen supply system and the feed water oxygen supply system are connected to the condensate pipeline at one end of the condenser 11; the outlet end of the condensate oxygen supply system is connected to the condensate pipeline at the other end of the condenser 11; the outlet end of the feed water oxygen supply system is connected to the deaerator 13.

[0028] The present invention is further explained below in conjunction with the specific drawings.

[0029] like Figure 1 As shown, the present invention provides an oxygen-free inherently safe evaporator water supply and oxygen replenishment device, which includes a condensate water pipeline, a condensate water oxygen replenishment system and a water supply and oxygen replenishment system.

[0030] The condensate water pipeline is provided with a condensate water replenishment electric valve 10, a condenser 11 and a condensate water pump 12.

[0031] One end of the condenser 11 is connected to one end of the condensate feed electric valve 10 , and the other end of the condenser 11 is connected to one end of the condensate pump 12 .

[0032] The inlet end of the condensate oxygen supply system is connected to the condensate pipeline at the other end of the electric valve 10 , and the outlet end of the condensate oxygen supply system is connected to the condensate pipeline between the condenser 11 and the condensate pump 12 .

[0033] The inlet end of the water supply and oxygen supply system is connected to the condensate pipeline at the other end of the electric valve 10 , and the outlet end of the water supply and oxygen supply system is connected to the deaerator 13 .

[0034] The condensate water oxygen supply system includes a condensate water oxygen supply main circuit and a condensate water oxygen supply branch circuit.

[0035] The inlet end of the condensate oxygen supply main path is connected to the condensate pipeline at the other end of the electric valve 10 , and the outlet end of the condensate oxygen supply main path is connected to the condensate pipeline between the condenser 11 and the condensate pump 12 .

[0036] The condensate water oxygen supply main line is provided with a condensate water oxygen supply inlet valve 20, a condensate water oxygen supply main line flow meter 21, a condensate water oxygen supply main line flow regulating valve 22 and a condensate water oxygen supply outlet valve 29.

[0037] The condensate water oxygen supply inlet valve 20 is arranged at the inlet end area of ​​the condensate water oxygen supply main path, and the condensate water oxygen supply outlet valve 29 is arranged at the outlet end area of ​​the condensate water oxygen supply main path.

[0038] A condensate water oxygen supply main path flow meter 21 is provided between the condensate water oxygen supply inlet valve 20 and the condensate water oxygen supply outlet valve 29 , and a condensate water oxygen supply main path flow regulating valve 22 is provided between the condensate water oxygen supply main path flow meter 21 and the condensate water oxygen supply outlet valve 29 .

[0039] The inlet end of the condensate oxygen supply branch is connected to the condensate oxygen supply main circuit between the condensate oxygen supply inlet valve 20 and the condensate oxygen supply main circuit flowmeter 21 , and the outlet end of the condensate oxygen supply branch is connected to the condensate oxygen supply outlet valve 29 .

[0040] The condensate water oxygen supply branch line is provided with a condensate water oxygen supply branch line flow meter 23, a condensate water oxygen supply branch line flow regulating valve 24 and a condensate water oxygen supply Venturi device 25.

[0041] A condensate water oxygen supply branch flowmeter 23 is provided at the inlet end of the condensate water oxygen supply branch.

[0042] A condensate oxygen supply Venturi device 25 is provided at the outlet end of the condensate oxygen supply branch, and a condensate oxygen supply Venturi pressure transmitter 26, a condensate oxygen supply air flow regulating valve 27 and a condensate oxygen supply air flow meter 28 are provided at the suction end of the condensate oxygen supply Venturi device 25.

[0043] A condensate water oxygen supply branch circuit flow regulating valve 24 is provided between the condensate water oxygen supply branch circuit flow meter 23 and the condensate water oxygen supply Venturi device 25 .

[0044] The water supply and oxygen supply system includes a water supply and oxygen supply main circuit and a water supply and oxygen supply branch circuit.

[0045] The inlet end of the water supply and oxygen supply main circuit is connected to the condensate pipeline at the other end of the electric valve 10 , and the outlet end of the water supply and oxygen supply is connected to the deaerator 13 .

[0046] The water supply and oxygen supply main line is provided with a water supply and oxygen supply inlet valve 30, a water supply and oxygen supply pump 31, a water supply and oxygen supply main line flow meter 32 and a water supply and oxygen supply main line flow regulating valve 33.

[0047] The water supply oxygen supply inlet valve 30 is arranged at the inlet end of the water supply oxygen supply main path, and the water supply oxygen supply main path flow regulating valve 33 is arranged at the outlet end of the water supply oxygen supply main path. A water supply oxygen supply main path flow meter 32 is arranged between the water supply oxygen supply inlet valve 30 and the water supply oxygen supply main path flow regulating valve 33.

[0048] The inlet end of the water supply oxygen supply branch is connected to the water supply oxygen supply pump 31 and the water supply oxygen supply main path flowmeter 32, and the outlet end of the water supply oxygen supply branch is connected to the deaerator 13.

[0049] The water supply and oxygen supply branch includes a water supply and oxygen supply branch flow meter 34, a water supply and oxygen supply branch flow regulating valve 35, a water supply and oxygen supply Venturi device 36, a water supply and oxygen supply Venturi pressure transmitter 37, a water supply and oxygen supply air flow regulating valve 38 and a water supply and oxygen supply air flow meter 39.

[0050] The inlet end of the water supply and oxygen supply branch is provided with a water supply and oxygen supply branch flowmeter 34, the outlet end of the water supply and oxygen supply branch is provided with a water supply and oxygen supply Venturi device 36, and the suction end of the water supply and oxygen supply Venturi device 36 is provided with a water supply and oxygen supply Venturi pressure transmitter 37, a water supply and oxygen supply air flow regulating valve 38 and a water supply and oxygen supply air flowmeter 39.

[0051] A water supply and oxygen supply branch flow regulating valve 35 is provided between the water supply and oxygen supply branch flow meter 34 and the water supply and oxygen supply Venturi device 36 .

[0052] The present invention is further explained below in conjunction with specific embodiments.

[0053] Example The present invention includes a condensate oxygen replenishment system and a water supply oxygen replenishment system. The water intake points of the condensate oxygen replenishment system and the water supply oxygen replenishment system are arranged on the condensate pipeline in front of the condensate replenishment electric valve 10. The outlet pipeline of the condensate oxygen replenishment system is connected to the condensate pipeline at the inlet end of the condensate pump 12, and the outlet pipeline of the water supply oxygen replenishment system is connected to the downcomer of the deaerator 13.

[0054] On the condensate oxygen supply system, according to the flow direction of the desalted water in the pipeline, a condensate oxygen supply inlet valve 20, a condensate oxygen supply main line and a condensate oxygen supply branch line are arranged in sequence; the condensate oxygen supply main line is provided with a condensate oxygen supply main line flow meter 21 and a condensate oxygen supply main line flow regulating valve 22, and the desalted water can be directly injected into the condensate pipe in front of the condensate pump 12 through the pipeline under pressure; on the condensate oxygen supply branch line, a condensate oxygen supply branch line flow meter 23, a condensate oxygen supply branch line flow regulating valve 24, and a condensate oxygen supply Venturi device 25 are arranged in sequence, and the suction end of the condensate oxygen supply Venturi device 25 is provided with a condensate oxygen supply Venturi pressure transmitter 26, a condensate oxygen supply air flow regulating valve 27 and a condensate oxygen supply air flow meter 28, and a condensate oxygen supply outlet valve 29 is arranged on the outlet pipeline of the condensate oxygen supply system.

[0055] On the water supply and oxygen supply branch, according to the flow direction of the desalted water in the pipeline, a water supply and oxygen supply inlet valve 30 and a water supply and oxygen supply pump 31 for increasing the pressure of the desalted water are arranged in sequence, and the water supply and oxygen supply pump 31 is connected to the water supply and oxygen supply main circuit and the water supply and oxygen supply branch.

[0056] The main water supply and oxygen supply line is provided with a water supply and oxygen supply main line flow meter 32 and a water supply and oxygen supply main line flow regulating valve 33, and desalted water is injected into the water supply system through this branch line; the water supply and oxygen supply branch line flow meter 34, the water supply and oxygen supply branch line flow regulating valve 35, and the water supply and oxygen supply Venturi 36 are provided on the water supply and oxygen supply branch line, and the water supply and oxygen supply Venturi pressure transmitter 37, the water supply and oxygen supply air flow regulating valve 38 and the water supply and oxygen supply air flow meter 39 are provided at the suction end of the water supply and oxygen supply Venturi 36.

[0057] The second object of the present invention is to provide a method for using an oxygen-free inherently safe evaporator water supply oxygen supply device, comprising: Under normal operation of the unit, desalted water containing oxygen is added to the entire condensate water system through the condensate water oxygen supply main path flowmeter 21 and the condensate water oxygen supply main path flow regulating valve 22 in the condensate water oxygen supply main path in the condensate water oxygen supply system. At the same time, desalted water containing oxygen is injected into the water supply system using the water supply oxygen supply main path flowmeter 32 and the water supply oxygen supply main path flow regulating valve 33 in the water supply oxygen supply main path. The amount of desalted water supplied is automatically adjusted by the condensate water oxygen supply main path flow regulating valve 22 and the water supply oxygen supply main path flow regulating valve 33.

[0058] High oxygen regulation of condensate water make-up branch: When the unit make-up amount is low or the oxygen consumption needs to be increased during the oxygenation conversion stage, desalted water is added to the condensate water system through the condensate water make-up branch flowmeter 23, condensate water make-up branch flow regulating valve 24, and condensate water make-up Venturi device 25 in the condensate water make-up branch in the condensate water make-up system. The increase in oxygen concentration in the desalted water is achieved through the condensate water make-up Venturi device 25; when the condensate water make-up Venturi pressure transmitter 26 detects that the pressure is negative, the condensate water make-up air flow regulating valve 27 is opened and its opening is adjusted, and the dissolved oxygen content of the desalted water is regulated by reading the condensate water make-up air flowmeter 28 and the condensate water make-up branch flowmeter 23.

[0059] High oxygen regulation of water supply and oxygen replenishment branch: When the water replenishment amount of the unit is low or the oxygen consumption needs to be increased during the oxygenation conversion stage, desalted water is injected into the water supply system through the water supply and oxygen replenishment branch flow meter 34, the water supply and oxygen replenishment branch flow regulating valve 35, and the water supply and oxygen replenishment Venturi 36 in the water supply and oxygen replenishment branch of the water supply and oxygen replenishment system, and the water supply and oxygen replenishment Venturi 36 inhales air to achieve this; when the water supply and oxygen replenishment Venturi pressure transmitter 37 detects the existence of negative pressure, the water supply and oxygen replenishment air flow regulating valve 38 is started and its opening is adjusted, and the dissolved oxygen content of the desalted water on the water supply side is controlled according to the water supply and oxygen replenishment branch flow meter 34 and the water supply and oxygen replenishment air flow meter 39.

[0060] The present invention uses desalted water with oxygen dissolved therein and air sucked in through a venturi as the source of oxygen, avoiding the use of high-pressure oxygen cylinders or compressed air, and improving the inherent safety of the oxygenation equipment itself. By controlling the venturi device and the gas flow control measures, the oxygen content of the desalted water is increased, and the amount of desalted water used in the oxygenation conversion stage is reduced.

[0061] In the two branches of the condensate oxygen supply system and the feed water oxygen supply system, in addition to supplying oxygen to the condensate and feed water by controlling the amount of desalted water supply, oxygen supply venturis are also set on both oxygen supply branches to increase and control the oxygen content on the oxygen supply branch by controlling the liquid-gas ratio, thereby reducing the amount of desalted water supply in the condensate and feed water. The device has high inherent safety and does not use high-pressure oxygen and high-pressure compressed air. It is suitable for oxygenation of nuclear power direct current evaporators and direct current boilers in thermal power plants.

[0062] Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but rather with reference to the preceding claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to be a disclaimer of such subject matter, nor should it be considered that the applicants did not consider such subject matter to be part of the disclosed inventive subject matter.

[0063] The above content is a further detailed description of the present invention. It cannot be determined that the specific implementation methods of the present invention are limited to these. For ordinary technicians in the technical field to which the present invention belongs, without departing from the concept of the present invention, they can also make several simple deductions or substitutions, which should be regarded as belonging to the protection scope of the present invention determined by the submitted claims.

Claims

1. An oxygen-free inherently safe evaporator water supply oxygen supply device, characterized in that: Including condensate pipeline, condensate oxygen supply system and water supply oxygen supply system; The condensate pipeline is provided with a condenser (11); The inlet ends of the condensate oxygen supply system and the water supply oxygen supply system are connected to the condensate pipeline at one end of the condenser (11); the outlet end of the condensate oxygen supply system is connected to the condensate pipeline at the other end of the condenser (11); the outlet end of the water supply oxygen supply system is connected to the water supply system; The condensate water oxygen supply system comprises a condensate water oxygen supply main circuit and a condensate water oxygen supply branch circuit; The inlet end of the condensate water oxygen supply main circuit is connected to the condensate water pipeline at one end of the condenser (11), and the outlet end of the condensate water oxygen supply main circuit is connected to the condensate water pipeline at the other end of the condenser (11); the inlet end of the condensate water oxygen supply branch circuit is connected to the inlet end of the condensate water oxygen supply main circuit, and the outlet end of the condensate water oxygen supply branch circuit is connected to the outlet end of the condensate water oxygen supply main circuit; The condensate water oxygenation branch is provided with a condensate water oxygenation Venturi device (25); The water supply and oxygen supply system comprises a water supply and oxygen supply main circuit and a water supply and oxygen supply branch circuit; The inlet end of the water supply oxygen supply main circuit is connected to the condensate pipeline at one end of the condenser (11), and the outlet end of the water supply oxygen supply main circuit is connected to the deaerator (13); the inlet end of the water supply oxygen supply branch circuit is connected to the inlet end of the water supply oxygen supply main circuit, and the outlet end of the water supply oxygen supply branch circuit is connected to the outlet end of the water supply oxygen supply main circuit; The water supply and oxygen supply branch line is provided with a water supply and oxygen supply Venturi device (36).

2. The oxygen-free inherently safe evaporator water supply oxygen supply device according to claim 1, characterized in that: The condensate water pipeline is also provided with a condensate water replenishment electric valve (10) and a condensate water pump (12); The condensate replenishment electric valve (10) is arranged on a condensate pipeline between the inlet end of the condensate replenishment oxygen main path and one end of the condenser (11); The condensate pump (12) is arranged on a condensate pipeline between the outlet end of the condensate oxygen supply system and the other end of the condenser (11).

3. The oxygen-free inherently safe evaporator water supply oxygen supply device according to claim 1, characterized in that: The condensate water oxygen supply main path comprises a condensate water oxygen supply inlet valve (20), a condensate water oxygen supply main path flow meter (21), a condensate water oxygen supply main path flow regulating valve (22) and a condensate water oxygen supply outlet valve (29); The condensate water oxygen supply inlet valve (20) is arranged at the inlet end region of the condensate water oxygen supply main path; the condensate water oxygen supply outlet valve (29) is arranged at the outlet end region of the condensate water oxygen supply main path; A condensate water oxygen supply main path flow meter (21) is provided between the condensate water oxygen supply inlet valve (20) and the condensate water oxygen supply outlet valve (29); A condensate water oxygen supply main path flow regulating valve (22) is provided between the condensate water oxygen supply main path flow meter (21) and the condensate water oxygen supply outlet valve (29).

4. The oxygen-free inherently safe evaporator water supply oxygen supply device according to claim 3, characterized in that: The inlet end of the condensate water oxygen supply branch is connected between the condensate water oxygen supply inlet valve (20) and the condensate water oxygen supply main line flowmeter (21); The outlet end of the condensate water oxygen supply branch is connected between the condensate water oxygen supply main path flow regulating valve (22) and the condensate water oxygen supply outlet valve (29).

5. The oxygen-free inherently safe evaporator water supply oxygen supply device according to claim 1, characterized in that: The condensate water oxygen supply branch line is also provided with a condensate water oxygen supply branch line flow meter (23) and a condensate water oxygen supply branch line flow regulating valve (24); The condensate water oxygen supply branch circuit flow meter (23) is arranged at the inlet end of the condensate water oxygen supply branch circuit; The condensate water oxygenation Venturi device (25) is arranged at the outlet end of the condensate water oxygenation branch; The condensate water oxygen supply branch line flow regulating valve (24) is arranged between the condensate water oxygen supply branch line flow meter (23) and the condensate water oxygen supply Venturi device (25).

6. The oxygen-free inherently safe evaporator water supply oxygen supply device according to claim 1, characterized in that: The suction end of the condensate oxygen supply Venturi device (25) is provided with a condensate oxygen supply Venturi pressure transmitter (26), a condensate oxygen supply air flow regulating valve (27) and a condensate oxygen supply air flow meter (28).

7. The oxygen-free inherently safe evaporator water supply oxygen supply device according to claim 1, characterized in that: The water supply and oxygen supply main circuit comprises a water supply and oxygen supply inlet valve (30), a water supply and oxygen supply pump (31), a water supply and oxygen supply main circuit flow meter (32) and a water supply and oxygen supply main circuit flow regulating valve (33); The water supply and oxygen supply inlet valve (30) is arranged at the inlet end of the water supply and oxygen supply main path; the water supply and oxygen supply main path flow regulating valve (33) is arranged at the outlet end of the water supply and oxygen supply main path; The water supply and oxygen supply main path flow meter (32) is arranged between the water supply and oxygen supply inlet valve (30) and the water supply and oxygen supply main path flow regulating valve (33); The outlet of the main water supply and oxygen supply path is connected to the deaerator (13); The inlet end of the water supply and oxygen supply branch is connected between the water supply and oxygen supply pump (31) and the water supply and oxygen supply main circuit flow meter (32); The outlet end of the water supply oxygen supply branch is connected to a deaerator (13).

8. The oxygen-free inherently safe evaporator water supply oxygen supply device according to claim 1, characterized in that: The water supply and oxygen supply branch line is also provided with a water supply and oxygen supply branch line flow meter (34) and a water supply and oxygen supply branch line flow regulating valve (35); The water supply and oxygen supply branch circuit flow meter (34) is arranged at the inlet end of the water supply and oxygen supply branch circuit; The water supply oxygen supply Venturi device (36) is arranged at the outlet end of the water supply oxygen supply branch; The water supply and oxygen supply branch circuit flow regulating valve (35) is arranged between the water supply and oxygen supply branch circuit flow meter (34) and the water supply and oxygen supply Venturi device (36).

9. The oxygen-free inherently safe evaporator water supply oxygen supply device according to claim 1, characterized in that: The water supply and oxygen supply Venturi device (36) is provided with a water supply and oxygen supply Venturi pressure transmitter (37), a water supply and oxygen supply air flow regulating valve (38) and a water supply and oxygen supply air flow meter (39) at the suction end.

10. A method for using an oxygen-free inherently safe evaporator water supply oxygen supply device, characterized in that: An oxygen-free inherently safe evaporator water supply oxygen supply device according to any one of claims 1 to 9, comprising: Under normal operating conditions of the unit, condensate enters the condensate system through the condenser (11) in the condensate pipeline; The desalted water containing oxygen enters the condensate water system through the condensate water oxygen supply main line in the condensate water oxygen supply system; at the same time, the desalted water containing oxygen enters the water supply system through the water supply oxygen supply main line in the water supply oxygen supply system; at this time, the condensate water oxygen supply branch line and the water supply oxygen supply branch line are closed; When the unit's water replenishment is low or the oxygen dosage needs to be increased during the oxygenation conversion stage, the condensate oxygen replenishment branch and the feed water oxygen replenishment branch are opened; The desalted water containing oxygen enters the condensate water system through the condensate water oxygenation branch, and at the same time, the condensate water oxygenation Venturi device (25) is used to adjust the dissolved oxygen content in the desalted water; The desalted water containing oxygen enters the water supply system through the water supply oxygen supply branch. At the same time, the amount of dissolved oxygen in the desalted water is adjusted by using the water supply oxygen supply Venturi device (36).

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