Power plant membrane deaerator with high thermal efficiency

Abstract

The invention relates to the technical field of power plant deaeration equipment, in particular to a power plant membrane deaerator with high thermal efficiency, which comprises an emission reduction assembly and a treatment assembly, the treatment assembly comprises a plurality of treatment tanks connected end to end; the treatment tank comprises a membrane shell, a membrane wire filter element, a hollow fiber membrane, a water distribution pipe, a partition plate and a water collection pipe, deoxygenation treatment is carried out through the treatment tank, meanwhile, gas such as oxygen removed by the treatment tank is extracted through a connector, a vacuum pipeline and a vacuum connector through work of a vacuum pump, and the gas is exhausted through an exhaust connector; the treated water is discharged into the connecting pipe through the water collecting pipe, deoxygenated water is discharged through the water outlet pipe after circulating treatment in the plurality of treatment tanks and the connecting pipe, and gas discharged in the treatment process is oxygen and the like contained in raw water, so that hot steam cannot be taken away, the heat loss is reduced, and the heat efficiency is improved; according to the invention, heat loss can be reduced, the heat efficiency of the power plant boiler is ensured, the cost can be reduced, the environment is not influenced, and various gases can be removed.

Description

Technical Field

[0001] The present invention relates to the technical field of deaeration equipment in power plants, and specifically to a membrane deaerator for power plants with high thermal efficiency. Background Art

[0002] During the treatment of boiler feed water in power plants, the oxygen dissolved in water is the main factor causing boiler corrosion, which will accelerate the oxygen corrosion rate of boiler heating surfaces, pipelines and valves, affect the service life of equipment. The oxygen in the feed water will form bubbles in the boiler, affecting the heat exchange efficiency between water and the heating surface, reducing the heat conduction efficiency, and thus affecting the overall thermal efficiency of the boiler. Most of the existing deaeration methods use thermal deaerators or add chemical agents to remove the oxygen in water.

[0003] However, the above deaeration methods still have deficiencies in actual use: Using a thermal deaerator for deaeration will carry away hot steam, resulting in high heat loss and reducing the thermal efficiency of the power plant boiler. Using deaeration agents will increase costs and also affect the environment. Moreover, the above deaeration methods are difficult to remove multiple gases and cannot be quickly replaced online, affecting the user experience. Therefore, it is necessary to design a membrane deaerator for power plants with high thermal efficiency. Summary of the Invention

[0004] The purpose of the present invention is to address the above deficiencies, and to provide a membrane deaerator for power plants with high thermal efficiency that can not only reduce heat loss, ensure the thermal efficiency of the power plant boiler, reduce costs and not affect the environment, but also remove multiple gases, so as to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention adopts the following technical solution:

[0006] A membrane deaerator for power plants with high thermal efficiency includes an emission reduction component and two sets of symmetrically arranged treatment components. Any one of the treatment components includes a plurality of treatment tanks connected end to end. The treatment tank includes a membrane shell, a membrane filament filter element, a hollow fiber membrane, a water distribution pipe, a partition plate and a water collection pipe. The water distribution pipe and the water collection pipe are coaxially fixed in the membrane shell and separated by the partition plate. The hollow fiber membrane is coated on the water distribution pipe and extends to the bottom end of the water collection pipe. Membrane filament filter elements are respectively arranged at the top end of the water distribution pipe and the bottom end of the water collection pipe. A plurality of water distribution holes and water collection holes are radially distributed on both the water distribution pipe and the water collection pipe;

[0007] The emission reduction component includes a connector, a connecting pipe, a water outlet pipe, a water inlet pipe, a filter pipe, a filter, a pressurizing pipe, a pressurizing pump, a water inlet, a fixing frame, a vacuum pump, a vacuum interface, a vacuum pipeline and an exhaust interface. The connector is installed at the head and tail of the treatment tank. The connecting pipe is used to connect the head and tail of adjacent treatment tanks. The water outlet pipe connects the water outlet ends of two adjacent treatment components. The filter pipe, the filter, the pressurizing pipe, the pressurizing pump and the vacuum pump are all installed on the fixing frame. The water inlet end of the pressurizing pipe is connected to the pressurizing pump, and the water inlet is arranged at the water inlet end of the pressurizing pump. The filter is installed at the water outlet end of the pressurizing pipe. The water outlet end of the filter is connected to the water inlet end of the water inlet pipe through the filter pipe. The water outlet end of the water inlet pipe is connected to the water inlet ends of two treatment components. The vacuum pump is connected to the vacuum pipeline through the vacuum interface. The vacuum pipeline is communicated with the inside of the treatment tank through the connector at the tail of the treatment tank. The exhaust interface is arranged at the air outlet end of the vacuum pump.

[0008] Preferably, the hollow fiber membrane is woven by fiber filaments;

[0009] The fiber filament is composed of a fiber wall and a hollow tube, and the hollow tube is arranged in the fiber wall.

[0010] Preferably, the fiber filament is made of a high-performance hydrophobic membrane material and is produced by hot melt drawing. The fiber filament becomes hollow, and the fiber wall becomes a regular network after drawing. The mesh holes are the channels for water molecule mass transfer.

[0011] Preferably, a purge pipe is arranged between two treatment components. A purge interface is arranged on the purge pipe, and a first control valve is arranged on the purge interface. The purge pipe is communicated with the inside of the connector at the head of the treatment tank through a purge branch pipe.

[0012] Preferably, a connecting sleeve is connected to the end of the connector away from the treatment tank, and a second control valve is fixedly connected to the connecting sleeve.

[0013] Preferably, one end of the connecting sleeve is detachably connected to the connector through a flange, and the other end of the connecting sleeve is connected to the connecting pipe through a reinforced elbow sleeve.

[0014] Preferably, the connection between the water outlet ends of two treatment components and the water outlet pipe is sleeved through a reinforcing sleeve.

[0015] The beneficial effects of the present invention are:

[0016] As can be seen from the above technical solution, when the present invention is in use, water is introduced through the water inlet. Subsequently, the working of the pressure pump increases the water inlet pressure and drives the water to enter the filter through the pressure pipe. The filter filters the inlet water. The treated inlet water is transported to the water inlet pipe through the filter pipe. In the water inlet pipe, the water is simultaneously transported to two sets of treatment components. The water is sent to multiple treatment tanks through the connecting pipe. The treatment tanks perform deoxygenation treatment. At the same time, through the working of the vacuum pump, the oxygen and other gases removed by the treatment tanks are extracted through the connecting head, the vacuum pipe and the vacuum interface, and discharged through the exhaust interface. The treated water is then discharged to the connecting pipe through the water collecting pipe. After circulating treatment in multiple treatment tanks and the connecting pipe, the deoxygenated water is discharged through the water outlet pipe. The gases discharged during the treatment process are the oxygen and the like contained in the raw water, which will not carry away the hot steam, reduce the heat loss, and improve the thermal efficiency. The present invention can not only reduce the heat loss, ensure the thermal efficiency of the power plant boiler, reduce the cost and not affect the environment, but also remove multiple gases. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0018] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 is Figure 1 a partial enlarged view of part A in

[0020] Figure 3 is a top view of the present invention;

[0021] Figure 4 is a partial cross-sectional view of the treatment tank in the present invention;

[0022] Figure 5 is a schematic diagram of the structure of the hollow pipe in the present invention;

[0023] Reference numerals: 1, processing component; 2, emission reduction component; 4, functional component; 11, membrane housing; 12, membrane filament filter element; 13, hollow fiber membrane; 14, water distribution pipe; 15, partition plate; 16, water collecting pipe; 21, connector; 22, connecting pipe; 23, water outlet pipe; 24, water inlet pipe; 25, filter pipe; 26, filter; 27, pressure pipe; 28, pressure pump; 29, water inlet; 30, fixing bracket; 31, vacuum pump; 32, vacuum interface; 33, vacuum pipeline; 34, exhaust interface; 41, purge pipe; 42, purge interface; 43, first control valve; 44, connecting sleeve; 45, second control valve; 46, reinforced elbow sleeve; 47, reinforcing sleeve; 131, fiber filament; 1311, fiber wall; 1312, hollow pipe. Detailed implementation manners

[0024] The present application will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related invention, rather than limiting the invention. In addition, it should be noted that for the convenience of description, only the parts related to the invention are shown in the drawings.

[0025] Such as Figure 1 , Figure 2 , Figure 3 and Figure 4As shown in the figure, a membrane deaerator for power plants with high thermal efficiency includes an emission reduction component and two sets of symmetrically arranged treatment components. Any one of the treatment components includes a plurality of treatment tanks connected end to end. The treatment tank includes a membrane housing 11, a membrane filament filter element 12, a hollow fiber membrane 13, a water distribution pipe 14, a partition plate 15 and a water collection pipe 16. The water distribution pipe 14 and the water collection pipe 16 are coaxially fixed in the membrane housing 11 and separated by the partition plate 15. The hollow fiber membrane 13 is coated on the water distribution pipe 14 and extends to the bottom end of the water collection pipe 16. Membrane filament filter elements 12 are respectively arranged at the top end of the water distribution pipe 14 and the bottom end of the water collection pipe 16. A plurality of water distribution holes and water collection holes are radially distributed on both the water distribution pipe 14 and the water collection pipe 16. The emission reduction component includes a connector 21, a connecting pipe 22, a water outlet pipe 23, a water inlet pipe 24, a filter pipe 25, a filter 26, a pressurizing pipe 27, a pressurizing pump 28, a water inlet 29, a fixing frame 30, a vacuum pump 31, a vacuum interface 32, a vacuum pipeline 33 and an exhaust interface 34. The connector 21 is installed at the head and tail of the treatment tank. The connecting pipe 22 is used to connect the head and tail of adjacent treatment tanks. The water outlet pipe 23 connects the water outlet ends of two adjacent sets of treatment components. The filter pipe 25, the filter 26, the pressurizing pipe 27, the pressurizing pump 28 and the vacuum pump 31 are all installed on the fixing frame 30. The water inlet end of the pressurizing pipe 27 is connected to the pressurizing pump 28. The water inlet end of the pressurizing pump 28 is provided with the water inlet 29. The filter 26 is installed at the water outlet end of the pressurizing pipe 27. The water outlet end of the filter 26 is connected to the water inlet end of the water inlet pipe 24 through the filter pipe 25. The water outlet end of the water inlet pipe 24 is connected to the water inlet ends of two sets of treatment components. The vacuum pump 31 is connected to the vacuum pipeline 33 through the vacuum interface 32. The vacuum pipeline 33 is communicated with the inside of the treatment tank through the connector 21 at the tail of the treatment tank. The exhaust interface 34 is arranged at the air outlet end of the vacuum pump 31.

[0026] Working principle: Water is introduced through the water inlet 29. Subsequently, the working of the pressurizing pump 28 increases the water inlet pressure and drives the water to enter the filter 26 through the pressurizing pipe 27. The water inlet is filtered by the filter 26. The treated water is transported to the water inlet pipe 24 through the filter pipe 25. In the water inlet pipe 24, the water is simultaneously transported to two sets of treatment components. The water is sent to a plurality of treatment tanks through the connecting pipe 22. Deaeration treatment is carried out by the treatment tanks. At the same time, through the working of the vacuum pump 31, the oxygen and other gases removed by the treatment tanks are extracted through the connector 21, the vacuum pipeline 33 and the vacuum interface 32 and discharged through the exhaust interface 34. The treated water is then discharged into the connecting pipe 22 through the water collection pipe 16. After circulating treatment in a plurality of treatment tanks and the connecting pipe 22, the deaerated water is discharged through the water outlet pipe 23. The gases discharged during the treatment process are oxygen and the like contained in the raw water, which will not carry away the hot steam, reduce the heat loss and improve the thermal efficiency. The present invention can not only reduce the heat loss, ensure the thermal efficiency of the power plant boiler, reduce the cost and will not affect the environment, but also remove a variety of gases.

[0027] As Figure 1 , Figure 2 , Figure 3 and Figure 4 shown, the hollow fiber membrane 13 is woven by fiber filaments 131;

[0028] The fiber filament 131 is composed of a fiber wall 1311 and a hollow tube 1312, and the hollow tube 1312 is opened in the fiber wall 1311. In this embodiment, during the process of the treatment tank treating raw water, first, the incoming water is received through the water distribution pipe 14 and blocked by the partition plate 15, ensuring that the raw water can only flow from the water distribution holes to the membrane filament filter element 12. During the flowing process, the raw water is subjected to two-phase separation by the hollow fiber membrane 13 designed in the membrane filament filter element 12. The gas molecules are sucked away by vacuum under the action of external force, forming a continuous mass transfer process. Finally, the deoxygenated water after deoxygenating or removing other gases is discharged into the connecting pipe 22 through the water collecting pipe 16. The treated water supply conditions can meet the production requirements, improving the deoxygenation performance, avoiding the cavitation hazard of the high-position water pump caused by using a thermal deaerator, and deactivating the deoxygenation agent, reducing the cost and not affecting the environment.

[0029] As Figures 1-5 shown, the fiber filament 131 is a high-performance hydrophobic membrane material, made by hot melt drawing. The fiber filament 131 becomes hollow, and the fiber wall 1311 becomes a regular network after drawing. The mesh holes are the channels for water molecule mass transfer. In this embodiment, because the fiber filament 131 is a high-performance hydrophobic membrane material, made by hot melt drawing, the fiber filament 131 becomes hollow, and the fiber wall 1311 becomes a regular network after drawing. The mesh holes are the channels for molecular mass transfer. The gas molecules move from the liquid phase into the hollow tube 1312 under the pressure difference, while the water molecules remain stationary. The gas molecules transferred into the hollow tube 1312 are sucked away by vacuum under the action of external force, forming a continuous mass transfer process. Finally, the deoxygenated water after deoxygenating or removing other gases is discharged into the connecting pipe 22 through the water collecting pipe 16.

[0030] As Figures 1-5 shown, a purge pipe 41 is arranged between two groups of treatment components. A purge interface 42 is arranged on the purge pipe 41, and a first control valve 43 is arranged on the purge interface 42. The purge pipe 41 is internally communicated with the inside of the connector 21 at the head of the treatment tank through a purge branch pipe. In this embodiment, by installing other gas interfaces at the position of the purge interface 42, opening the first control valve 43, a small amount of nitrogen is blown into the connector 21 at the head of the treatment tank and the treatment tank through the purge pipe 41 for nitrogen sealing purge to remove the oxygen in the water. By blowing in air or discharging under negative pressure, carbon dioxide can be removed. By using dilute sulfuric acid solution, ammonia nitrogen gas in the wastewater can be removed.

[0031] As Figures 1-5As shown, a connecting sleeve 44 is connected to one end of the connector 21 away from the treatment tank, and a second control valve 45 is fixedly connected to the connecting sleeve 44. In this embodiment, the liquid inlet and outlet ends of the treatment tank can be closed through the second control valve 45, so that the treatment tank can be detached and replaced separately, making it more convenient to use.

[0032] As Figures 1-5 shown, one end of the connecting sleeve 44 is detachably connected to the connector 21 through a flange, and the other end of the connecting sleeve 44 is connected to the connecting pipe 22 through a reinforcing elbow sleeve 46. In this embodiment, the connector 21 is detachably connected through a flange, making the loading and unloading of the treatment tank more convenient.

[0033] As Figures 1-5 shown, the connection between the water outlet ends of the two treatment components and the water outlet pipe 23 is sleeved through a reinforcing sleeve 47. In this embodiment, the connection strength between the water outlet ends of the two treatment components and the water outlet pipe 23 can be enhanced through the reinforcing sleeve 47.

[0034] The specific embodiments described herein are merely illustrative of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the scope defined by the present invention.

Claims

1. A high thermal efficiency power plant membrane deaerator, characterized in that: It includes an emission reduction component and two sets of symmetrically arranged treatment components, and each set of the treatment components includes a plurality of treatment tanks connected end to end; The treatment tank comprises a membrane shell (11), a membrane filter element (12), a hollow fiber membrane (13), a water distribution pipe (14), a partition (15) and a water collection pipe (16); the water distribution pipe (14) and the water collection pipe (16) are coaxially fixed in the membrane shell (11) and separated by the partition (15); the hollow fiber membrane (13) is coated on the water distribution pipe (14) and extends to the bottom end of the water collection pipe (16); the top end of the water distribution pipe (14) and the bottom end of the water collection pipe (16) are respectively provided with a membrane filter element (12); and a plurality of water distribution holes and water collection holes are radially distributed on the water distribution pipe (14) and the water collection pipe (16); The emission reduction assembly comprises a connector (21), a connecting pipe (22), a water outlet pipe (23), a water inlet pipe (24), a filter pipe (25), a filter (26), a pressurizing pipe (27), a pressurizing pump (28), a water inlet (29), a fixing frame (30), a vacuum pump (31), a vacuum interface (32), a vacuum pipeline (33) and an exhaust interface (34). The connector (21) is installed at the head and tail of the treatment tank. The connecting pipe (22) is used to connect the head and tail of adjacent treatment tanks. The water outlet pipe (23) connects the water outlet ends of two adjacent groups of treatment assemblies. The filter pipe (25), the filter (26), the pressurizing pipe (27), the pressurizing pump (28) and the vacuum pump (31) are used to connect the head and tail of adjacent treatment tanks. The pumps (31) are all installed on the fixing frame (30), the water inlet end of the pressurizing pipe (27) is connected to the pressurizing pump (28), the water inlet end of the pressurizing pump (28) is provided with a water inlet (29), the filter (26) is installed at the water outlet end of the pressurizing pipe (27), the water outlet end of the filter (26) is connected to the water inlet end of the water inlet pipe (24) through a filter pipe (25), the water outlet end of the water inlet pipe 24 is connected to the water inlet ends of the two groups of treatment components, the vacuum pump (31) is connected to the vacuum pipe (33) through a vacuum interface (32), the vacuum pipe (33) is connected to the inside of the treatment tank through a connector (21) at the rear of the treatment tank, and the exhaust interface (34) is provided at the air outlet end of the vacuum pump (31).

2. The ash removal and desulfurization device for a thermal power plant according to claim 1, characterized in that: The hollow fiber membrane (13) is woven by fiber filaments (131); The fiber filament (131) is composed of a fiber wall (1311) and a hollow tube (1312), and the hollow tube (1312) is opened in the fiber wall (1311).

3. A ash removal and desulfurization device for a thermal power plant according to claim 2, characterized in that: The fiber filaments (131) are high-performance hydrophobic membrane materials, which are made by hot-melt drawing. The fiber filaments (131) become hollow, and the fiber walls (1311) become regular meshes after drawing, and the mesh holes serve as channels for water molecule mass transfer.

4. The ash removal and desulfurization device for a thermal power plant according to claim 1, characterized in that: A purge pipe (41) is provided between the two groups of treatment components, the purge pipe (41) is provided with a purge interface (42), the purge interface (42) is provided with a first control valve (43), and the purge pipe (41) is connected to the interior of the connector (21) at the head of the treatment tank through a purge branch pipe.

5. A ash removal and desulfurization device for a thermal power plant according to claim 4, characterized in that: One end of the connector (21) away from the treatment tank is connected to a connecting sleeve (44), and a second control valve (45) is fixedly connected to the connecting sleeve (44).

6. The ash removal and desulfurization device for a thermal power plant according to claim 5, characterized in that: One end of the connecting sleeve (44) is detachably connected to the connecting head (21) via a flange, and the other end of the connecting sleeve (44) is connected to the connecting pipe (22) via a reinforced bent sleeve (46).

7. The ash removal and desulfurization device for a thermal power plant according to claim 1, characterized in that: The connection between the water outlet ends of the two groups of treatment components and the water outlet pipe (23) is sleeved via a reinforcing sleeve (47).

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