A supercritical once-through boiler condensate recovery and utilization device

Abstract

This utility model relates to the field of boiler technology and discloses a supercritical once-through boiler condensate recovery and utilization device, comprising: a condensate expansion container, with a first pipe fixedly installed at both ends of the condensate expansion container, one of the first pipes being fixedly connected to a deaerator; a jacket structure, the jacket structure including an outer jacket, a first water pipe and a second water pipe, the outer jacket being fixedly connected to the condensate expansion container, the first water pipe and the second water pipe being fixedly connected to the outer jacket and communicating with a channel; and a flow guiding component, where water is guided by blades to form a spiral flow trajectory before being discharged from the first water pipe. The blades guide and divert the water, increasing the water flow path, improving the contact surface area and heat exchange effect between the condensate expansion container and the water, making the cooling water flow field more uniform, reducing dead zones, and fully utilizing the cooling area. Under the same cooling water flow rate and temperature difference, it can remove more heat and more effectively reduce the saturated water temperature.

Description

Technical Field

[0001] This utility model relates to the field of boiler technology, and in particular to a supercritical once-through boiler condensate recovery and utilization device. Background Technology

[0002] Currently, supercritical once-through boilers have become the mainstay of my country's thermal power units.

[0003] A search revealed a supercritical once-through boiler condensate recovery and utilization system (publication number: CN115681950A), which includes a condensate expansion tank and a deaerator. The condensate expansion tank is equipped with a first water inlet, a steam outlet, and a drain outlet. The first water inlet is connected to the overflow main pipe of the water storage tank through a first pipeline. The steam outlet is connected to the deaerator through a second pipeline. The drain outlet is connected to the deaerator through a third pipeline.

[0004] In the prior art, cooling is achieved by setting a spray structure inside the hydrophobic expansion container. However, the spray method can affect the separation of critical water inside the container and easily cause uneven cooling. Therefore, there is room for optimization in the cooling method of the hydrophobic expansion container.

[0005] Therefore, we propose a supercritical once-through boiler condensate recovery and utilization device. Utility Model Content

[0006] The present invention mainly addresses the technical problem of unreasonable cooling methods in the above-mentioned hydrophobic expansion vessel, and provides a hydrophobic recovery and utilization device for a supercritical DC boiler.

[0007] To achieve the above objectives, this utility model adopts the following technical solution: a supercritical once-through boiler condensate recovery and utilization device, comprising:

[0008] A hydrophobic expansion container, wherein a first pipe is fixedly installed at both ends of the hydrophobic expansion container, one of the first pipes is fixedly connected to a deaerator, and a second pipe is also fixedly installed on the hydrophobic expansion container, the second pipe being connected to the deaerator;

[0009] A jacket structure is provided outside the hydrophobic expansion container for cooling the hydrophobic expansion container. The jacket structure includes an outer jacket, a first water pipe, and a second water pipe. The outer jacket is fixedly connected to the hydrophobic expansion container, and a flow channel is formed between the outer jacket and the hydrophobic expansion container. The first water pipe and the second water pipe are both fixedly connected to the outer jacket and communicate with the channel.

[0010] A flow guiding component, installed within the channel, is used to guide the flow of water.

[0011] In a preferred embodiment of this utility model, the outer casing is a sealed cylindrical container, and the two ends of the hydrophobic expansion container are fixedly connected to the inner end face of the outer casing by welding, forming an annular channel between the outer wall of the hydrophobic expansion container and the inner wall of the outer casing.

[0012] In a preferred embodiment of this utility model, the outer casing has two mounting openings on its circumferential surface, and the first water pipe and the second water pipe are welded into the corresponding mounting openings.

[0013] In a preferred embodiment of this invention, the flow guiding component includes blades, which are fixedly disposed within the channel, and the blades divide the channel to form a spirally curved path.

[0014] In a preferred embodiment of this utility model, the blade is a spiral stainless steel plate, and the blade is fixed and sealed to the outer casing and the outer wall of the hydrophobic expansion container by welding.

[0015] In a preferred embodiment of this invention, the flow guiding component further includes convection holes, and the blades are provided with a plurality of convection holes, through which water within the blade pitch can pass and enter the next pitch.

[0016] In a preferred embodiment of this utility model, the flow guiding component further includes protrusions, and several protrusions are fixedly installed on the convection hole. The protrusions are provided with anchoring holes, and the protrusions are fixed to the blades by rivets.

[0017] This invention provides a device for recovering and utilizing condensate from a supercritical once-through boiler. It has the following beneficial effects:

[0018] 1. This supercritical once-through boiler condensate recovery and utilization device, by setting an outer jacket on the outside of the condensate expansion container, forms a cooling channel with the outer jacket and the condensate expansion container. A second water pipe is connected to a cooling water source, such as water that has been cooled and pumped by a water pump. The water is guided by blades to form a spiral flow trajectory before being discharged from the first water pipe. The blades guide and divert the water, which increases the water flow, improves the contact surface area between the condensate expansion container and the water and the heat exchange effect, makes the cooling water flow field more uniform, reduces flow dead zones, and makes full use of the cooling area. Under the same cooling water flow rate and temperature difference, it can remove more heat and more effectively reduce the saturated water temperature.

[0019] 2. This supercritical once-through boiler condensate recovery and utilization device enhances the water flow effect within two adjacent pitches of the blades by opening several convection holes on the blades, allowing a small amount of fluid to pass through and promoting interlayer mixing. The protrusions are blade-shaped, and the tips of the protrusions need to face the water flow. The protrusions are riveted to the blades by inserting rivets in the anchoring holes, thus realizing the installation of the protrusions. It has the characteristics of flexible installation and high degree of customization. Secondly, through the combination of the protrusions and the spiral blades, the water flow will form turbulence when passing through the protrusions, enhancing the turbulence effect and promoting heat exchange between water and protrusions. Attached Figure Description

[0020] Figure 1 This is a perspective view of the entire utility model;

[0021] Figure 2 This is a partial sectional view of the outer casing of this utility model;

[0022] Figure 3 This is a perspective view of the blade and hydrophobic expansion container of this utility model;

[0023] Figure 4 This is a perspective view of the blade of this utility model;

[0024] Figure 5 This is a perspective view of the protrusion of this utility model.

[0025] Legend: 10. Hydrophobic expansion container; 11. First pipe; 12. Second pipe; 13. Deaerator; 20. Outer casing; 21. First water pipe; 22. Second water pipe; 30. Blade; 31. Convection hole; 32. Protrusion; 33. Anchor hole. Detailed Implementation

[0026] A supercritical once-through boiler condensate recovery and utilization device, such as Figure 1 and Figure 2 As shown, it includes:

[0027] A condensate expansion container 10 is provided, with a first pipe 11 fixedly installed at both ends. One of the first pipes 11 is fixedly connected to a deaerator 13. A second pipe 12 is also fixedly installed on the condensate expansion container 10, connected to the deaerator 13. One of the first pipes 11 is connected to the overflow pipe of the boiler water storage tank. Through the condensate expansion container 10, the overflow main pipe of the water storage tank is connected to the condensate expansion container 10 via the first pipes 11. High-energy condensate, after depressurization, enters the newly added condensate expansion container 10. Within the condensate expansion container 10, steam-water separation is achieved, separating saturated steam and saturated water. The separated saturated steam enters the steam space of deaerator 13 through another first pipe 11 after depressurization. The separated saturated water enters the water space of deaerator 13 through a second pipe 12 after depressurization. The saturated steam and saturated water can serve as the heating source for deaerator 13. The saturated steam is depressurized and expanded inside deaerator 13, and the saturated water undergoes secondary steam-water separation inside deaerator 13. Finally, the saturated steam and saturated water generated inside deaerator 13 are used to heat condensate, realizing the recovery and utilization of high-energy hydrophobic water. This will not be elaborated here. The first pipe 11 and the second pipe 12 mentioned in the text need to be connected to valves for use.

[0028] like Figure 1 and Figure 2 As shown, a jacket structure is installed outside the hydrophobic expansion container 10 for cooling the hydrophobic expansion container 10. The jacket structure includes an outer jacket 20, a first water pipe 21, and a second water pipe 22. The outer jacket 20 is fixedly connected to the hydrophobic expansion container 10, and a flow channel is formed between the outer jacket 20 and the hydrophobic expansion container 10. The first water pipe 21 and the second water pipe 22 are both fixedly connected to the outer jacket 20 and communicate with the channel. The outer jacket 20 is a sealed cylindrical container. The two ends of the hydrophobic expansion container 10 are fixedly connected to the inner end face of the outer jacket 20 by welding. An annular channel is formed between the outer wall of the hydrophobic expansion container 10 and the inner wall of the outer jacket 20. Two mounting ports are opened on the circumferential surface of the outer jacket 20, and the first water pipe 21 and the second water pipe 22 are welded into the corresponding mounting ports.

[0029] like Figure 3 and Figure 4 As shown, the flow guiding component is installed within the channel to guide the water flow;

[0030] The flow guiding assembly includes blades 30, which are fixedly installed within the channel. The blades 30 divide the channel into a spirally curved path. The blades 30 are spiral-shaped stainless steel plates. The blades 30 are fixed and sealed to the outer casing 20 and the outer wall of the hydrophobic expansion container 10 by welding. The blades 30 need to be fully welded to ensure airtightness.

[0031] In this scheme, an outer jacket 20 is installed outside the hydrophobic expansion container 10, forming a cooling channel with the outer jacket 20 and the hydrophobic expansion container 10. The second water pipe 22 is connected to the cooling water source, such as water that has been cooled and pumped by a water pump. After being guided by the blades 30, the water forms a spiral flow trajectory and is discharged from the first water pipe 21. The blades 30 guide and divert the water, which increases the water flow, improves the contact surface area and heat exchange effect between the hydrophobic expansion container 10 and the water, makes the cooling water flow field more uniform, reduces the flow dead zone, and makes full use of the cooling area. Under the same cooling water flow rate and temperature difference, more heat can be removed, and the saturated water temperature can be reduced more effectively.

[0032] like Figure 4 and Figure 5 As shown, the flow guiding assembly also includes convection holes 31. Several convection holes 31 are opened through the blade 30. Water in the pitch of the blade 30 can pass through the convection holes 31 and enter the next pitch. The flow guiding assembly also includes protrusions 32. Several protrusions 32 are fixedly installed in the convection holes 31. Anchor holes 33 are opened in the protrusions 32. The protrusions 32 and the blade 30 are fixed by rivets.

[0033] In this scheme, as an optimization and supplement to the above scheme, several convection holes 31 are opened on the blade 30 to enhance the flow effect of water within two adjacent pitches of the blade 30, allowing a small amount of fluid to pass through and promoting interlayer mixing. The protrusion 32 is blade-shaped, and the tip of the protrusion 32 needs to face the water flow. The protrusion 32 is riveted and fixed to the blade 30 by inserting rivets in the anchoring hole 33, thus realizing the installation of the protrusion 32. It has the characteristics of flexible installation and high degree of customization. Secondly, with the protrusion 32 and the spiral blade 30, the water flow will form turbulence when passing through the protrusion 32, enhancing the turbulence effect and promoting the contact heat exchange between water and protrusion 32.

[0034] It should be noted that the blade 30 can be made of 2022 duplex stainless steel, which can ensure cavitation resistance and service life. The helix angle of the blade 30 is between 30 and 60 degrees, and the pitch can be adjusted according to the length of the hydrophobic expansion container 10.

[0035] The working principle of this utility model is as follows: The overflow main pipe of the water storage tank is connected to the condensate expansion container 10 through the first pipe 11. After the high-energy condensate is depressurized, it enters the newly added condensate expansion container 10. The high-energy condensate achieves steam-water separation in the condensate expansion container 10, which can be separated into saturated steam and saturated water. The separated saturated steam enters the steam space of the deaerator 13 through another first pipe 11 after depressurization. The separated saturated water enters the water space of the deaerator 13 through the second pipe 12 after depressurization. The saturated steam and saturated water can be used as the heating heat source of the deaerator 13. The saturated steam is depressurized and expanded inside the deaerator 13. The saturated water undergoes secondary steam-water separation inside the deaerator 13. Finally, saturated steam and saturated water are generated inside the deaerator 13.

[0036] The second water pipe 22 connects to a cooling water source, such as water that has been cooled and pumped by a water pump. After being guided by the blades 30, the water forms a spiral flow trajectory and is then discharged from the first water pipe 21. The blades 30 guide and divert the water, increasing the water flow and improving the contact surface area and heat exchange effect between the hydrophobic expansion container 10 and the water. By opening several convection holes 31 on the blades 30, the flow effect of water within two adjacent pitches of the blades 30 is enhanced, allowing a small amount of fluid to pass through and promoting interlayer mixing. The protrusion 32 is blade-shaped, and the tip of the protrusion 32 needs to face the water flow. The protrusion 32 is riveted to the blades 30 by inserting rivets in the anchoring holes 33, thus achieving the installation of the protrusion 32. It has the characteristics of flexible installation and high degree of customization. Secondly, with the protrusion 32 and the spiral blades 30, the water flow will form turbulence when passing through the protrusion 32, enhancing the turbulence effect and promoting the contact heat exchange between the water and the protrusion 32.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A supercritical once-through boiler drain recovery device, characterized by, include: A hydrophobic expansion container (10) is provided, with a first pipe (11) fixedly installed at both ends of the hydrophobic expansion container (10), one of the first pipes (11) being fixedly connected to a deaerator (13), and a second pipe (12) being fixedly installed on the hydrophobic expansion container (10), the second pipe (12) being connected to the deaerator (13); A jacket structure is provided outside the hydrophobic expansion container (10) for cooling the hydrophobic expansion container (10). The jacket structure includes an outer jacket (20), a first water pipe (21), and a second water pipe (22). The outer jacket (20) is fixedly connected to the hydrophobic expansion container (10), and a flow channel is formed between the outer jacket (20) and the hydrophobic expansion container (10). The first water pipe (21) and the second water pipe (22) are both fixedly connected to the outer jacket (20) and communicate with the channel. A flow guiding component, installed within the channel, is used to guide the flow of water.

2. The supercritical once-through boiler condensate recovery and utilization device according to claim 1, characterized in that: The outer casing (20) is a sealed cylindrical container. The two ends of the hydrophobic expansion container (10) are fixedly connected to the inner end face of the outer casing (20) by welding. An annular channel is formed between the outer wall of the hydrophobic expansion container (10) and the inner wall of the outer casing (20).

3. The supercritical once-through boiler condensate recovery and utilization device according to claim 1, characterized in that: The outer casing (20) has two mounting ports on its circumferential surface, and the first water pipe (21) and the second water pipe (22) are welded into the corresponding mounting ports.

4. The supercritical once-through boiler condensate recovery and utilization device according to claim 1, characterized in that: The flow guiding assembly includes blades (30), which are fixedly disposed in the channel and divide the channel to form a spirally curved path.

5. The supercritical once-through boiler condensate recovery and utilization device according to claim 4, characterized in that: The blade (30) is a spiral stainless steel plate. The blade (30) is fixed and sealed to the outer wall of the outer jacket (20) and the hydrophobic expansion container (10) by welding.

6. The supercritical once-through boiler condensate recovery and utilization device according to claim 4, characterized in that: The flow guiding assembly also includes convection holes (31), and the blade (30) has several convection holes (31) through it. Water in the pitch of the blade (30) can pass through the convection holes (31) and enter the next pitch.

7. The supercritical once-through boiler condensate recovery and utilization device according to claim 6, characterized in that: The flow guiding component also includes protrusions (32), and several protrusions (32) are fixedly installed on the convection hole (31). The protrusions (32) are provided with anchoring holes (33), and the protrusions (32) are fixed to the blade (30) by rivets.

Images