Multipurpose water supply and oxygenation device

Abstract

The utility model belongs to the technical field of water supply and oxygenation of a direct-current evaporator of a nuclear power plant, and relates to a multipurpose water supply and oxygenation device which comprises a dosing tank and two dosing pipelines, the dosing tank is connected with the two dosing pipelines, the tail ends of the two dosing pipelines are combined to a same dosing pipeline mother pipe, and the dosing pipeline mother pipe is connected with a condensation water pipeline and a deaerator in a distributed mode. And an outlet of the deaerator is connected with a water supply downcomer. On the basis of original facilities of a nuclear power plant, the device is slightly modified, the chemical dosing tank and the mixer are combined to add oxygen to the unit, and water supply and oxygen adding of the unit of the nuclear power plant are achieved. According to the device, equipment recycling of a hydrazine adding system after unit oxygenation conversion is achieved at the same time, and the two functions of reducing full-volatilization water supply treatment and water supply oxygenation can be achieved at the same time.

Description

Technical Field

[0001] This utility model belongs to the field of feedwater oxygenation technology for DC evaporators in nuclear power plants, and relates to a multi-purpose feedwater oxygenation device. Background Technology

[0002] As one of the advanced feedwater treatment processes currently used in thermal power DC units or nuclear power DC evaporators, feedwater oxygenation can form a protective oxide layer on the inner wall of the feedwater pipeline, thereby effectively slowing down the flow-accelerated corrosion rate of the feedwater system, reducing the corrosion and scaling rate of thermal equipment, reducing the frequency of chemical cleaning of the boiler body or DC evaporator, while extending the fine treatment operation cycle, saving power plant operation and maintenance costs, and improving the economic efficiency of the power plant.

[0003] Currently, the most common methods for oxygenating feedwater are pure oxygen, air, and oxygen-enriched water. All three methods require significant modifications to power plant facilities, including the addition of containers, turbines, piping, cables, and control logic, resulting in high costs and long construction periods. Thermal power plants and nuclear power units using direct-flow evaporators are designed with AVT(R) (reducing total volatile feedwater treatment) technology, which includes a hydrazine dosing system. Implementing feedwater oxygenation modifications would render the unit's existing hydrazine dosing system idle, leading to a waste of equipment and space for the power plant. Utility Model Content

[0004] This invention proposes a multi-purpose feedwater oxygenation device to solve the problems of high retrofitting costs and idleness of other systems in nuclear power plants caused by the installation of feedwater oxygenation devices in existing technologies.

[0005] The technical solution of this utility model:

[0006] This utility model discloses a multi-purpose water supply oxygenation device, which includes a dosing tank and two dosing pipelines. The dosing tank connects to the two dosing pipelines, and the ends of the two dosing pipelines merge into a common dosing pipeline header. The dosing pipeline header connects to a condensate pipeline and a deaerator, respectively. The deaerator outlet connects to a water supply downcomer. The dosing pump is a positive displacement pump with frequency conversion function. Each dosing pipeline is equipped with two dosing pumps, one of which serves as a backup. A condensate dosing valve is installed between the dosing pipeline header and the condensate pipeline.

[0007] In some embodiments, the dosing pipeline, from one end of the dosing tank to one end of the dosing pipeline header, is sequentially equipped with an inlet isolation valve, a mixer, a filter, a dosing pump, a pressure relief valve, a pressure gauge, a volume compensator, an outlet check valve, and an outlet isolation valve.

[0008] In some embodiments, the mixer is a gas-liquid mixer, and the mixers of the two dosing lines are respectively connected to oxygen cylinders via oxygen valves.

[0009] In some embodiments, the pressure relief valves of the two dosing lines are connected to the same main pipe via pipelines, and the main pipe is connected to the dosing tank. The pressure relief valves are used for online pressure regulation of the device.

[0010] In some embodiments, a main feedwater dosing valve is provided between the main dosing pipeline and the deaerator.

[0011] The beneficial effects of this utility model are:

[0012] This invention proposes a multi-purpose feedwater oxygenation device. Based on existing nuclear power plant facilities, this device involves minor modifications, employing a combination of a dosing tank and a mixer to oxygenate the unit's feedwater. The device also enables the reuse of equipment in the hydrazine addition system after the unit's oxygenation conversion, and simultaneously performs both reducing, volatile feedwater treatment and feedwater oxygenation functions. Attached Figure Description

[0013] Figure 1 A schematic diagram of a multi-purpose water supply oxygenation device designed according to this utility model;

[0014] Attached diagram descriptions: 1. Dosing tank; 2. Inlet isolation valve; 3. Mixer; 4. Filter screen; 5. Dosing pump; 6. Pressure relief valve; 7. Pressure gauge; 8. Volume compensator; 9. Outlet check valve; 10. Outlet isolation valve; 11. Condensate dosing valve; 12. Condensate pipeline; 13. Main feedwater dosing valve; 14. Deaerator; 15. Oxygen cylinder; 16. Oxygen supply valve. Detailed Implementation

[0015] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0016] like Figure 1 As shown, this utility model proposes a simple and multi-purpose water supply oxygenation device. The device includes a dosing tank 1, two dosing pipelines, a condensate dosing valve, and a main water supply dosing valve 13. The dosing tank 1 is connected to the two dosing pipelines, and the ends of the two dosing pipelines are merged into the same dosing pipeline header. The dosing pipeline header is connected to the condensate pipeline 12 and the deaerator 14, respectively. The outlet of the deaerator 14 is connected to the water supply downcomer. A condensate dosing valve is provided between the dosing pipeline header and the condensate pipeline 12, and a main water supply dosing valve 13 is provided between the dosing pipeline header and the deaerator 14.

[0017] The dosing pipeline, from one end of the dosing tank 1 to the other end of the main dosing pipeline, is sequentially equipped with an inlet isolation valve 2, a mixer 3, a filter 4, a dosing pump 5, a pressure relief valve 6, a pressure gauge 7, a volumetric compensator 8, an outlet check valve 9, and an outlet isolation valve 10. The mixer 3 is a gas-liquid mixer, and the mixers 3 of the two dosing pipelines are connected to oxygen cylinders 15 via oxygen valves 16. The pressure relief valves 6 of the two dosing pipelines are connected to the same main pipeline, which is connected to the dosing tank 1. The pressure relief valves 6 are used for online pressure regulation of the device. The dosing pump 5 is a positive displacement pump with frequency conversion function, and each line has a capacity of 100%. Under normal circumstances, each dosing pipeline has two dosing pumps 5, one of which is used as a backup.

[0018] The simplicity of this device is reflected in the fact that the dosing tank 1, inlet isolation valve 2, filter screen 4, dosing pump 5, pressure relief valve 6, pressure gauge 7, volume compensator 8, outlet check valve 9, outlet isolation valve 10, condensate dosing valve 11, and main feedwater dosing valve 13 can all be directly replaced by the hydrazine dosing equipment of the nuclear power unit itself. The equipment layout, pressure rating, pipe diameter, valves, cables, and control logic require minimal modification.

[0019] The versatility of this device is reflected in the multiple options for the substances in the dosing tank 1 under different operating conditions: during the AVT(R) (reducing volatile feedwater treatment) operation of the unit, the solution in the dosing tank 1 is hydrazine solution; during the oxygenation operation of the unit, the solution in the dosing tank 1 is demineralized water at normal temperature and pressure or hydrogen peroxide solution to oxygenate the unit, and oxygen cylinder 15 and oxygenation valve 16 are used in conjunction to oxygenate the unit.

[0020] The embodiments of this utility model have been described in detail above. This utility model is not limited to the above examples. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this utility model.

Claims

1. A multi-purpose water oxygenating device, characterized by, The device comprises a dosing tank (1), two dosing pipelines, the dosing tank (1) is connected with the two dosing pipelines, the two dosing pipelines are combined into a same dosing pipeline main pipe at the end, the dosing pipeline main pipe is connected with a condensate pipeline (12) and a deaerator (14) respectively, and the deaerator (14) is connected with a feedwater downcomer at the outlet; from one end of the dosing tank (1) to one end of the dosing pipeline main pipe, the dosing pipeline is sequentially provided with an inlet isolation valve (2), a mixer (3), a filter screen (4), a dosing pump (5), a pressure relief valve (6), a pressure gauge (7), a volume compensator (8), an outlet check valve (9) and an outlet isolation valve (10); the dosing pump (5) is a volume pump and has a frequency conversion function, two dosing pumps (5) are arranged on each dosing pipeline, one of the dosing pumps (5) is used as a backup; a condensate dosing valve (11) is arranged between the dosing pipeline main pipe and the condensate pipeline (12).

2. A multi-purpose water oxygenating device according to claim 1, characterized in that The mixer (3) is a gas-liquid mixer, and the mixers (3) of the two dosing pipelines are respectively connected with oxygen cylinders (15) through oxygen valves (16).

3. A multi-purpose water oxygenating device according to claim 2, characterized in that The pressure relief valves (6) of the two dosing pipelines are connected to a same main pipe through pipelines, the main pipe is connected with the dosing tank (1), and the pressure relief valves (6) are used for online pressure adjustment of the device.

4. A multi-purpose water oxygenating device according to claim 3, characterized in that A main feedwater dosing valve (13) is arranged between the dosing pipeline main pipe and the deaerator (14).

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