Deoxidizing system for heat supply unit

Abstract

The utility model relates to a deoxidizing system for a heat supply unit, which belongs to the technical field of deoxidizing of heat supply units and comprises a membrane type deaerator component, a thermal deaerator component, a vacuum pump and a purge device. An inlet of the membrane type deaerator assembly is connected with the water supply main pipe, an outlet of the membrane type deaerator assembly is connected with an inlet of the thermal deaerator assembly through a pipeline, and an outlet of the thermal deaerator assembly is connected to the boiler through a pipeline. The vacuum pump and the purge device are installed at the position of the membrane type deaerator assembly, the vacuum pump and the purge device are connected with the membrane type deaerator assembly, and the system is used for transformation of a deaerator of an existing heat supply unit, the heat supply capacity of the existing heat supply unit is improved, and the use amount of self-used steam is reduced; the system further has more flexible and changeable adjusting modes, the operation mode of the deaerator can be flexibly adjusted according to the unit load, and efficient, stable and energy-saving operation of the deaeration system is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of deoxidation of heating units, and relates to a deoxidation system for heating units. Background Art

[0002] Deaerator is a necessary equipment in boiler system. Its main function is to reduce the oxygen content in boiler feed water to meet the standard requirements, so as to ensure that the metal parts of boiler, steam turbine unit and the whole system do not suffer excessive oxidation corrosion at high temperature. In coal-fired boiler, feed water deoxygenation is very important, because oxygen is one of the main causes of metal corrosion. When the oxygen content in water is too high, it will cause corrosion of boiler pipes and equipment, thus affecting the operating efficiency and life of the boiler.

[0003] At present, there are three main methods for deoxygenating boiler feed water: thermal deoxygenation, chemical deoxygenation and membrane deoxygenation;

[0004] (1) Thermal deoxygenation is a deoxygenation process based on Henry's law and Dalton's law. Henry's law states that when liquid and gas are in the same equilibrium state, at a constant temperature, the amount of gas dissolved in a unit volume of liquid is proportional to the partial pressure of the gas on the liquid surface; when the water temperature rises, the evaporation of water increases, the partial pressure of water vapor on the water surface increases, and the partial pressure of gas decreases relatively, causing the gas in the water to continuously precipitate and reach a new dynamic equilibrium state. Dalton's law states that the total pressure of the mixed gas is equal to the sum of the partial pressures of each component gas; for water supply, the total pressure of the mixed gas on the water surface is equal to the sum of the partial pressure of the gas and the partial pressure of the steam; it can be seen that when the amount of water vapor in the mixed gas on the water surface is increased, the partial pressure of oxygen can be reduced, creating conditions for deoxygenation. When the water reaches the saturation temperature, the partial pressure of steam on the water surface is close to the total pressure of the mixed gas, and the partial pressure of the non-condensable gas is close to zero, so that the gas dissolved in the water will continue to be discharged from the water surface until it reaches the equilibrium state at this temperature and pressure. Thermal deoxygenation is a process of heat and mass transfer. Therefore, thermal deoxygenation must meet two conditions: (a) heat transfer conditions: quickly heating water to the saturation temperature under the corresponding pressure; (b) mass transfer conditions: allowing the gas to be quickly separated and discharged from the water. Thermal deoxygenation is a common deoxygenation method, usually used in the fields of power, chemical industry, etc.

[0005] (2) Chemical deoxygenation is the process of removing oxygen from water by chemically reacting certain chemicals with oxygen in water. Commonly used chemicals include hydrazine and acetone; these chemicals can react with oxygen in water under certain conditions to generate compounds that are not easily soluble in water, thereby removing oxygen from water. This method is generally used for water with low oxygen content, or as an auxiliary deoxygenation method to completely remove oxygen from water. The system is simple and the investment is low, but the operating cost is high due to the need to regularly add chemical agents.

[0006] (3) Membrane deoxygenation is a process in which liquid flows outside the hollow fiber membrane while the inside of the hollow fiber membrane is evacuated or gas purged, or a combination of the two. The surface of the hydrophobic hollow fiber membrane has many micropores, which allow gas molecules to pass through but block the penetration of water molecules. Under the negative pressure of vacuum or gas purging, the gas dissolved in the liquid outside the hollow fiber membrane continuously moves into the inside of the hollow fiber membrane through the micropores and is carried away by the vacuum or purging gas, thereby achieving the purpose of removing the dissolved gas in the liquid.

[0007] In summary, most boilers currently use thermal deaerator technology, but there are the following problems: the water temperature of the thermal deaerator usually needs to be heated to the boiling point of water, the thermal deaerator uses a large amount of steam, and it is discharged together with oxygen during the exhaust process, resulting in steam waste; the thermal deaerator is a pressure vessel, with high maintenance costs and complex operation and adjustment. Utility Model Content

[0008] In view of the problems existing in the prior art, the utility model provides a deoxygenation system for a heating unit, which is used for the transformation of the deaerator of the existing heating unit, so as to improve the heating capacity of the existing heating unit and reduce the self-use steam consumption; in addition, the deoxygenation system also has a more flexible and changeable adjustment method, which can flexibly adjust the operation mode of the deoxygenation system according to the load of the unit, so as to ensure the efficient, stable and energy-saving operation of the deoxygenation system.

[0009] The utility model is realized by the following technical solutions:

[0010] A deoxidation system for a heating unit, comprising a membrane deoxidizer assembly, a thermal deoxidizer assembly, a vacuum pump and a purge device;

[0011] The inlet of the membrane deaerator assembly is connected to the water supply mother pipe, the outlet of the membrane deaerator assembly is connected to the inlet of the thermal deaerator assembly through a pipeline, and the outlet of the thermal deaerator assembly is connected to the boiler through a pipeline; the vacuum pump and the purge are installed at the membrane deaerator assembly, and the vacuum pump and the purge are respectively connected to the membrane deaerator assembly.

[0012] Preferably, the deoxygenated water side inlet of the thermal deaerator assembly is connected to the outlet main pipe of the membrane deaerator assembly, and the steam side inlet of the thermal deaerator assembly is bypassed and connected to the heating steam pipeline.

[0013] Preferably, a side bypass of the water supply main pipe is connected to the inlet of the thermal deaerator assembly, and a valve assembly is provided on the pipeline between the side bypass of the water supply main pipe and the thermal deaerator assembly.

[0014] Preferably, the membrane deaerator assembly comprises a plurality of membrane deaerators, and the plurality of membrane deaerators are connected in parallel;

[0015] The inlet of the membrane deaerator is connected to the desalted jellyfish pipe, and the outlet of the membrane deaerator is connected to the inlet main pipe of the thermal deaerator assembly.

[0016] Preferably, the membrane deaerator comprises a degassing membrane assembly, a filter and a gas source triplex;

[0017] The inlet of the gas source triplex is connected to the gas source, and the outlet of the gas source triplex is connected to the gas side inlet of the degassing membrane assembly; the inlet of the filter is connected to the water supply mother pipe, and the outlet of the filter is connected to the water side inlet of the degassing membrane assembly; the deoxygenated water side outlet of the gas source triplex is connected to the deoxygenated water side inlet of the thermal deaerator assembly; the other side of the degassing membrane assembly is respectively connected to a vacuum pump and a purge device.

[0018] Preferably, the thermal deaerator assembly includes multiple thermal deaerators, which are connected in parallel, and the outlet branches of each thermal deaerator are combined and connected to the boiler; the inlet branches of each thermal deaerator are combined and connected to the outlet of the membrane deaerator assembly.

[0019] Preferably, the membrane deaerator assembly is arranged near the water supply main or near the thermal deaerator assembly.

[0020] Preferably, the membrane deaerator assembly is installed with the vacuum pump and the purge device in a skid-mounted manner.

[0021] Preferably, a valve assembly is provided on the connecting pipeline between the membrane deaerator assembly and the water supply mother pipe; and a valve assembly is provided on the connecting pipeline between the membrane deaerator assembly and the thermal deaerator assembly.

[0022] Preferably, the membrane deaerator component and the thermal deaerator component are operated separately or in parallel.

[0023] Compared with the prior art, the utility model has the following beneficial technical effects:

[0024] The utility model provides a deoxygenation system for a heating unit. By adding a membrane deaerator component to the original deoxygenation system of the boiler and connecting it in series with the thermal deaerator component, the membrane deaerator component can effectively remove dissolved oxygen in water and reduce the oxygen content of the feed water; the thermal deaerator component further removes residual oxygen using high-temperature steam on the basis of the membrane deaerator component to ensure that the feed water reaches a lower oxygen content standard; this dual deoxygenation mechanism greatly improves the overall deoxygenation efficiency and reduces the risk caused by the failure of a single deoxygenation method. The vacuum pump helps the membrane deaerator component to work more effectively, and the purge can purge the membrane deaerator component regularly or on demand to remove impurities and dirt accumulated on the surface, maintain the permeability of the membrane, and thus maintain the deoxygenation efficiency. This deoxygenation system that integrates membrane deoxygenation, thermal deoxygenation, vacuum pumps and purges can efficiently remove dissolved oxygen in feed water, reduce oxide emissions generated during boiler operation, improve deoxygenation efficiency, optimize system performance, and save energy and reduce consumption, which has positive significance for environmental protection.

[0025] Furthermore, the membrane deaerator assembly and the thermal deaerator assembly can be used simultaneously or separately. When the membrane deaerator assembly and the thermal deaerator assembly are operated together, the thermal deaerator assembly only serves as a heating device, heating the desalted water after deoxygenation from the membrane deaerator assembly to the temperature required for boiler operation and sending it into the boiler without steam discharge, thereby reducing the amount of steam used by the deaerator system, improving the heating capacity of the unit, and improving the economy of the system. When the membrane deaerator assembly or the thermal deaerator assembly is under maintenance or fails, the other deaerator assembly operates alone and meets the oxygen content requirement of the boiler feed water.

[0026] Further, the thermal deaerator assembly operates at a high temperature, but because the membrane deaerator assembly has already removed most of the oxygen, the amount of steam required for the thermal deaerator assembly may be reduced, thereby saving energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram of a deoxygenation system for a heating unit;

[0028] Figure 2 It is a structural schematic diagram of a membrane deaerator;

[0029] In the figure: 1. Membrane deaerator assembly; 2. Thermal deaerator assembly; 3. Vacuum pump; 4. Purge device; 5. Boiler; 6. Water supply main pipe; 7. Air source triplex; 8. Filter; 9. Degassing membrane assembly; 10. Air source. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below in conjunction with specific embodiments, which are intended to explain the present invention rather than to limit it.

[0031] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0032] A deoxidation system for a heating unit, such as Figure 1 As shown, it includes a membrane deaerator component 1, a thermal deaerator component 2, a vacuum pump 3 and a purge device 4;

[0033] The inlet of the membrane deaerator assembly 1 is connected to the water supply mother pipe 6, the outlet of the membrane deaerator assembly 1 is connected to the inlet of the thermal deaerator assembly 2 through a pipeline, and the outlet of the thermal deaerator assembly 2 is connected to the boiler 5 through a pipeline; the vacuum pump 3 and the purge device 4 are installed at the membrane deaerator assembly, and the vacuum pump 3 and the purge device 4 are respectively connected to the membrane deaerator assembly.

[0034] The specific operation mode is as follows: the desalted water from the water supply mother pipe 6 first enters the membrane deaerator assembly 1, and deoxygenation is performed at room temperature in the membrane deaerator assembly 1. The outlet of the membrane deaerator assembly 1 is connected to the thermal deaerator assembly 2. The deoxygenated feed water enters the thermal deaerator assembly 2 and is heated to the required temperature, and then enters the boiler 5. The vacuum pump 3 is connected to the membrane deaerator assembly 1 for vacuuming to improve the working efficiency of the membrane deaerator assembly 1. The purge device 4 is also connected to the membrane deaerator assembly 1 to discharge the oxygen separated in the membrane deaerator assembly 1 in time to improve the working efficiency of the membrane deaerator assembly 1.

[0035] The deoxygenated water inlet of the thermal deaerator assembly 2 is connected to the outlet main pipe of the membrane deaerator assembly 1, and the steam inlet of the thermal deaerator assembly 2 is connected to the heating steam pipeline in a bypass manner. The deoxygenated water inlet and steam inlet of the thermal deaerator assembly 2 are both provided with electric regulating valves;

[0036] One side bypass of the water supply main pipe 6 is connected to the inlet of the thermal deaerator assembly 2. A valve assembly is arranged on the pipeline between the one side bypass of the water supply main pipe 6 and the thermal deaerator assembly 2. The valve assembly is composed of a manual regulating valve and an electric regulating valve, which is used to switch the operation mode of the system;

[0037] The membrane deaerator assembly 1 includes a plurality of membrane deaerators, and the plurality of membrane deaerators are connected in parallel.

[0038] The inlet of the membrane deaerator is connected to the desalted jellyfish pipe, and the outlet of the membrane deaerator is connected to the inlet main pipe of the thermal deaerator assembly 2.

[0039] like Figure 2 As shown, the membrane deaerator includes a degassing membrane assembly 9, a filter 8 and an air source triplex 7, which can remove dissolved oxygen in water at room temperature, and the deoxygenation rate meets the oxygen content requirement of the feed water of the power plant boiler 5;

[0040] The inlet of the gas source triplet 7 is connected to the gas source 10, and the outlet of the gas source triplet 7 is connected to the gas side inlet of the degassing membrane assembly 9; the inlet of the filter 8 is connected to the water supply mother pipe 6, and the outlet of the filter 8 is connected to the water side inlet of the degassing membrane assembly 9; the deoxygenated water side outlet of the gas source triplet 7 is connected to the deoxygenated water side inlet of the thermal deaerator assembly 2; the other side of the degassing membrane assembly 9 is respectively connected to the vacuum pump 3 and the purge 4. The gas source 10 uses high-purity nitrogen; the filter 8 uses a safety filter;

[0041] Its working principle is as follows: the treated high-purity nitrogen flows out from the outlet of the gas source triplet 7 and enters the gas side inlet of the degassing membrane assembly 9. In the degassing membrane assembly 9, nitrogen is used as a carrier gas to remove the dissolved oxygen in the water. The desalted water from the water supply mother pipe 6 enters the filter 8, which is used to remove impurities in the salt water to prevent the impurities from clogging or damaging the degassing membrane assembly 9. The filtered desalted water flows out from the outlet of the filter 8 and enters the water side inlet of the degassing membrane assembly 9; in the degassing membrane assembly 9, the nitrogen and the desalted water form a pressure difference on both sides of the membrane. By utilizing the selective permeability of the membrane, the dissolved oxygen in the desalted water is taken away by the nitrogen under the drive of the concentration gradient, thereby achieving deoxygenation. The vacuum pump 3 is used to form a negative pressure environment inside the degassing membrane assembly 9 to enhance the driving force for the oxygen to precipitate from the water; the purge device 4 is used to regularly purge the degassing membrane assembly 9 to prevent clogging of the membrane surface and ensure the deoxygenation efficiency. The deoxygenated desalted water flows out from the water outlet of the degassing membrane assembly 9. The deoxygenated water portion can flow to the thermal deaerator assembly 2 through the deoxygenated water side outlet of the gas source triplex 7 for further deoxygenation treatment, and then be used as feed water for the boiler 5 of the power plant.

[0042] The air source triplex 7 is also called an air filter pressure reducing valve; the air source triplex 7 includes an air filter, a pressure reducing valve and an oil mist collector. The compressed air first enters the air filter for purification, then enters the pressure reducing valve for voltage stabilization control, and finally enters the oil mist collector for lubrication; the oil mist collector atomizes the lubricating oil and then enters the pneumatic device together with the compressed air to play a lubricating role.

[0043] The vacuum pump 3 is connected to the degassing membrane assembly 9 of the membrane deaerator to maintain the vacuum degree in the degassing membrane assembly 9. A conventional vacuum pump can be used to meet the requirement of long-term stable operation.

[0044] The purge device 4 is connected to the degassing membrane assembly 9 of the membrane deaerator, and can timely discharge the oxygen removed from the degassing membrane assembly 9. High-purity nitrogen or other water-insoluble gases can be used to meet the requirements of long-term continuous and stable operation.

[0045] The thermal deaerator assembly 2 includes a plurality of thermal deaerators, which are connected in parallel, and the outlet branches of each thermal deaerator are connected to the boiler 5 after being aggregated; the inlet branches of each thermal deaerator are connected to the outlet of the membrane deaerator assembly 1 after being aggregated. The thermal deaerator is a traditional thermal deaerator, which meets the requirements of water quality and water temperature when used alone.

[0046] In one preferred embodiment, the number of membrane deaerator assemblies 1 is 2, including a first membrane deaerator and a second membrane deaerator, and the first membrane deaerator and the second membrane deaerator are connected in parallel;

[0047] In one preferred embodiment, the number of thermal deaerator assemblies 2 is 3, including a first thermal deaerator, a second thermal deaerator and a third thermal deaerator, and the first thermal deaerator, the second thermal deaerator and the third thermal deaerator are connected in parallel;

[0048] The membrane deaerator assembly 1 is arranged near the water supply main pipe 6 or near the thermal deaerator assembly 2 .

[0049] The membrane deaerator assembly 1, the vacuum pump 3 and the purge device 4 are installed in a skid-mounted manner. The skid-mounted installation method refers to fixing a group of equipment on a chassis made of angle steel or I-beam to form an equipment unit that can be installed and moved as a whole;

[0050] A valve assembly is provided on the connecting pipeline between the membrane deaerator and the water supply mother pipe 6; a valve assembly is provided on the connecting pipeline between the membrane deaerator and the thermal deaerator.

[0051] The valve assembly is composed of a manual regulating valve and an electric regulating valve, which are used to switch the operation mode of the system, including operation of a single membrane deaerator or operation of a single thermal deaerator or coupling operation of a membrane deaerator and a thermal deaerator.

[0052] The membrane deaerator assembly 1 and the thermal deaerator assembly 2 are operated separately or in parallel. The membrane deaerator assembly 1 and the thermal deaerator assembly 2 are connected in series, the working fluid is desalted water, and they are connected by pipelines. They can be operated simultaneously or separately, and can be switched to each other according to the operating conditions to ensure that the oxygen content and water temperature of the outlet water of the deaerator system meet the stable operation requirements of the boiler 5.

[0053] Preferred embodiment:

[0054] The desalted water from the water supply mother pipe 6 first enters the membrane deaerator assembly 1. The membrane deaerator assembly 1 includes two membrane deaerators arranged in parallel, one for use and one for standby. The desalted water is deoxygenated at room temperature in the membrane deaerator assembly. The outlet of the membrane deaerator assembly 1 is connected to the thermal deaerator assembly 2. The desalted water from the membrane deaerator assembly 1 after deoxygenation enters the thermal deaerator assembly 2 and is heated to the required temperature by the hot steam from the heating steam pipeline, and then enters the boiler 5. The vacuum pump 3 is connected to the membrane deaerator assembly 1 for vacuuming and improving the efficiency of the membrane deaerator. The purge device 4 is also connected to the membrane deaerator assembly 1 to discharge the oxygen separated from the membrane deaerator assembly 1 in time and improve the efficiency of the membrane deaerator assembly 1. When the membrane deaerator assembly 1 and the thermal deaerator assembly 2 are used together, the thermal deaerator assembly 2 is only used as a heating device, and the desalted water after deoxygenation from the membrane deaerator assembly 1 is heated to the temperature required for the operation of the boiler 5 and sent to the boiler 5, without the external discharge of steam, which reduces the amount of steam used by the deoxygenation system, improves the heating capacity of the unit, and improves the economy of the system. The membrane deaerator assembly 1 and the thermal deaerator assembly 2 operate separately when the membrane deaerator assembly 1 or the thermal deaerator assembly 2 is under maintenance or failure, and the membrane deaerator assembly 1 and the thermal deaerator assembly 2 can both operate separately and meet the oxygen content requirement of the boiler 5 feed water.

[0055] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any other variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0056] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. 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.

[0058] The above description is only a preferred embodiment of the utility model and does not limit the utility model in any form. Any ordinary technician in the industry can smoothly implement the utility model as shown in the drawings of the specification and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the utility model using the technical content disclosed above are all equivalent embodiments of the utility model. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the utility model are still within the protection scope of the technical solution of the utility model.

Claims

1. A deoxygenation system for a heating unit, characterized in that: It comprises a membrane deaerator assembly (1), a thermal deaerator assembly (2), a vacuum pump (3) and a purge device (4); The inlet of the membrane deaerator assembly (1) is connected to the water supply mother pipe (6), the outlet of the membrane deaerator assembly (1) is connected to the inlet of the thermal deaerator assembly (2) through a pipeline, and the outlet of the thermal deaerator assembly (2) is connected to the boiler (5) through a pipeline; the vacuum pump (3) and the purge device (4) are installed at the membrane deaerator assembly (1), and the vacuum pump (3) and the purge device (4) are respectively connected to the membrane deaerator assembly (1).

2. A deoxidation system for a heating unit according to claim 1, characterized in that: The deoxygenated water side inlet of the thermal deaerator component (2) is connected to the outlet main pipe of the membrane deaerator component (1), and the steam side inlet of the thermal deaerator component (2) is bypassed and connected to the heating steam pipeline.

3. A deoxidation system for a heating unit according to claim 1, characterized in that: A side bypass of the water supply main pipe (6) is connected to the inlet of the thermal deaerator assembly (2), and a valve assembly is provided on the pipeline between the side bypass of the water supply main pipe (6) and the thermal deaerator assembly (2).

4. A deoxidation system for a heating unit according to claim 1, characterized in that: The membrane deaerator assembly (1) comprises a plurality of membrane deaerators, and the plurality of membrane deaerators are connected in parallel; The inlet of the membrane deaerator is connected to the desalted jellyfish pipe, and the outlet of the membrane deaerator is connected to the inlet main pipe of the thermal deaerator assembly (2).

5. A deoxidation system for a heating unit according to claim 4, characterized in that: The membrane deaerator comprises a degassing membrane assembly (9), a filter (8) and a gas source triplex (7); The inlet of the gas source triplex (7) is connected to the gas source (10), and the outlet of the gas source triplex (7) is connected to the gas side inlet of the degassing membrane assembly (9); the inlet of the filter (8) is connected to the water supply mother pipe (6), and the outlet of the filter (8) is connected to the water side inlet of the degassing membrane assembly (9); the deoxygenated water side outlet of the gas source triplex (7) is connected to the deoxygenated water side inlet of the thermal deaerator assembly (2); and the other side of the degassing membrane assembly (9) is respectively connected to a vacuum pump (3) and a purge device (4).

6. A deoxidation system for a heating unit according to claim 1, characterized in that: The thermal deaerator assembly (2) comprises a plurality of thermal deaerators, which are connected in parallel; the outlet branches of each thermal deaerator are connected to the boiler (5) after being aggregated, and the inlet branches of each thermal deaerator are connected to the outlet of the membrane deaerator assembly (1) after being aggregated.

7. A deoxidation system for a heating unit according to claim 1, characterized in that: The membrane deaerator assembly (1) is arranged near the water supply main pipe (6) or near the thermal deaerator assembly (2).

8. The deoxidation system for a heating unit according to claim 1, characterized in that: The membrane deaerator assembly (1), the vacuum pump (3) and the purge device (4) are installed in a skid-mounted manner.

9. The deoxidation system for a heating unit according to claim 1, characterized in that: A valve assembly is provided on the connecting pipeline between the membrane deaerator assembly (1) and the water supply mother pipe (6); and a valve assembly is provided on the connecting pipeline between the membrane deaerator assembly (1) and the thermal deaerator assembly (2).

10. The deoxidation system for a heating unit according to claim 1, characterized in that: The membrane deaerator component (1) and the thermal deaerator component (2) are operated independently or in parallel.

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