Thermal power station boiler blow-down water recovery device

Abstract

The utility model relates to the technical field of thermal power plant boiler sewage recovery equipment, and discloses a thermal power plant boiler blow-down water recovery device which comprises a boiler, one side of the boiler is connected with a sewage drainage pipe, and one end of the sewage drainage pipe is connected to one side of a sewage heat exchange box. According to the boiler blow-down water recovery device for the thermal power station, sewage in a boiler enters the sewage heat exchange box through the sewage drainage pipe, low-temperature water treated by the sewage treatment mechanism enters the heat exchange pipeline, and the sewage exchanges heat with the low-temperature water in the heat exchange pipeline through the outer surface of the heat exchange pipeline in the sewage heat exchange box; and the effects that the sewage can exchange heat with low-temperature water in the heat exchange pipeline through the outer surface of the heat exchange pipeline in the sewage heat exchange box, the situation that scale is formed on the inner wall, inconvenient to clean, of the heat exchange pipeline is avoided, the scale formed by the sewage on the heat exchange pipeline can be conveniently cleaned, and the service life of the heat exchange pipeline is prolonged are achieved.

Description

Technical Field

[0001] This application relates to the technical field of boiler wastewater recovery equipment in thermal power plants, specifically a boiler wastewater recovery device for thermal power plants. Background Technology

[0002] During operation, thermal power plant boilers need to periodically discharge high-temperature wastewater containing a large amount of impurities to control boiler water quality and prevent boiler scaling. The traditional treatment method is to directly cool the wastewater before discharging it, which results in a large amount of energy waste. Therefore, boiler wastewater recovery devices are needed to treat and recover the wastewater and utilize its heat energy.

[0003] An existing patent (publication number: CN219347495U) discloses a waste heat recovery and cooling device for boiler wastewater in a thermal power plant, relating to the technical field of boiler equipment in thermal power plants. The device includes a waste heat recovery tank with a heat dissipation component inside. A top cover is provided on the top of the tank, and a sealing gasket is arranged around the bottom of the top cover. Insert rods are symmetrically fixedly connected to both ends of the bottom of the top cover, and fixing grooves are formed on the side walls of the insert rods. Insertion grooves that cooperate with the insert rods are symmetrically formed at both ends of the top of the waste heat recovery tank. Fixing components are symmetrically slidably arranged on the side walls at both ends of the waste heat recovery tank, with the fixing ends of the fixing components extending into the insertion grooves. A reset component is provided at the bottom of the insertion grooves. Softened water inlet pipes and softened water outlet pipes are symmetrically connected to both ends of the waste heat recovery tank. This device simplifies the steps required for inspecting and cleaning the heat dissipation pipes, and to some extent improves the work efficiency of personnel.

[0004] The above solution involves transporting sewage into the heat exchange pipes to exchange heat with the low-temperature water in the sewage waste heat recovery tank, thereby utilizing the thermal energy of the sewage. However, the sewage in the heat exchange pipes causes a large amount of scale to form on the inner wall of the heat exchange pipes, making it inconvenient to clean the scale inside the heat exchange pipes, affecting the heat exchange performance of the heat exchange pipes, and thus failing to fully utilize the waste heat of the sewage. Utility Model Content

[0005] To address the shortcomings of existing technologies, this application provides a wastewater recovery device for thermal power plant boilers. This device allows wastewater to exchange heat with low-temperature water inside the heat exchange pipes via the outer surface of the pipes within the wastewater heat exchange tank. This prevents scale buildup on the difficult-to-clean inner walls of the heat exchange pipes, facilitates the cleaning of scale formed by wastewater, and extends the service life of the heat exchange pipes. It solves the problem that wastewater inside the heat exchange pipes causes a large amount of scale to form on the inner walls, making cleaning difficult and affecting the heat exchange performance of the pipes, thus hindering the full utilization of wastewater's waste heat.

[0006] To achieve the aforementioned goal of allowing wastewater to exchange heat with the low-temperature water inside the heat exchange pipes via the outer surface of the heat exchange pipes within the wastewater heat exchange tank, preventing scale formation on the difficult-to-clean inner walls of the heat exchange pipes, and facilitating the cleaning of scale formed on the heat exchange pipes, thereby extending the service life of the heat exchange pipes, this application provides the following technical solution: A wastewater recovery device for a thermal power plant boiler, comprising a boiler, a wastewater drain pipe connected to one side of the boiler, one end of the wastewater drain pipe connected to one side of the wastewater heat exchange tank, a connecting pipe connected to the other side of the wastewater heat exchange tank, one end of the connecting pipe connected to a wastewater treatment mechanism, a heat exchange pipe inside the wastewater heat exchange tank, one end of the heat exchange pipe connected to one end of a treated water inlet pipe via a connecting flange, the other end of the treated water inlet pipe extending to the outside of the wastewater heat exchange tank and connected to the wastewater treatment mechanism, the other end of the heat exchange pipe connected to one end of a treated water outlet pipe via a connecting flange, and the other end of the treated water outlet pipe extending to the outside of the wastewater heat exchange tank and connected to the recovery mechanism.

[0007] The above solution involves wastewater from the boiler entering the wastewater heat exchange tank through a wastewater drain pipe. Low-temperature water, treated by the wastewater treatment system, then enters the heat exchange pipes. Inside the wastewater heat exchange tank, the wastewater exchanges heat with the low-temperature water inside the heat exchange pipes via the outer surface of the pipes. This method prevents scale buildup on the difficult-to-clean inner walls of the heat exchange pipes, facilitating easy cleaning of any scale formed and extending the service life of the heat exchange pipes.

[0008] Furthermore, the wastewater heat exchange box is equipped with multiple partitions inside, which are staggered on both sides of the inner wall in the middle of the wastewater heat exchange box, and the multiple partitions cooperate with each other to form a serpentine wastewater heat exchange channel.

[0009] The above scheme guides the flow of sewage in the sewage heat exchange box by forming a serpentine sewage heat exchange channel through the cooperation of multiple partitions, so that the sewage can be uniformly heat-exchanged inside the sewage heat exchange box.

[0010] Furthermore, the heat exchange pipe is arranged in a serpentine pattern, and the serpentine heat exchange pipe is located within a sewage heat exchange channel formed by the cooperation of multiple baffles. The shape of the heat exchange pipe is adapted to the path of the sewage heat exchange channel formed by the cooperation of multiple baffles.

[0011] The above scheme, through the serpentine heat exchange pipes and the multiple baffles that work together to form a sewage heat exchange channel, can increase the contact area between the sewage and the heat exchange pipes, allowing the sewage to fully exchange heat with the low-temperature water in the heat exchange pipes and avoiding the waste of heat energy.

[0012] Furthermore, the bottom of the inner wall of the wastewater heat exchange box is provided with multiple support seats via support blocks, and the support seats are located below the heat exchange pipes.

[0013] The above solution provides support for the heat exchange pipes inside the wastewater heat exchange box, improving their stability and preventing deformation, thus extending their service life.

[0014] Furthermore, a sealing cover is provided above the wastewater heat exchange box, and the sealing cover is fixedly connected to the wastewater heat exchange box by an installation component.

[0015] With the above solution, the sealing cover can be easily removed from the top of the sewage heat exchanger via the installation assembly, which facilitates the cleaning of the inside of the sewage heat exchanger and the cleaning and maintenance of the outer surface of the heat exchange pipes inside the sewage heat exchanger, ensuring the heat exchange efficiency of the heat exchange pipes.

[0016] Furthermore, a first sealing gasket is provided between the wastewater heat exchange box and the sealing cover, and the first sealing gasket is located at the edge of the bottom outer surface of the sealing cover.

[0017] The above solution uses a first sealing gasket to seal the connection between the sealing cover and the wastewater heat exchange tank, preventing wastewater leakage from the tank.

[0018] Furthermore, the bottom of the sealing cover is provided with a slot, and the inner wall of the slot is fitted onto the outer surface above the partition.

[0019] The above solution, through the setting of the slot, can further fix the position of the baffle and improve the stability of the baffle inside the sewage heat exchanger.

[0020] Furthermore, a second sealing gasket is provided at the top of the inner wall of the card slot, and the second sealing gasket is located between the top of the partition and the top of the inner wall of the card slot.

[0021] The above solution uses a second sealing gasket to seal the space between the card slot and the partition, preventing sewage from flowing between the partition and the card slot and thus preventing the sewage from flowing through the sewage heat exchange channel formed by the multiple partitions.

[0022] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0023] This is a boiler wastewater recovery device for thermal power plants. Wastewater from the boiler enters the interior of a wastewater heat exchange tank through a wastewater drain pipe. Low-temperature water, treated by a wastewater treatment unit, enters the interior of the heat exchange pipes. Inside the wastewater heat exchange tank, the wastewater exchanges heat with the low-temperature water inside the heat exchange pipes through the outer surface of the pipes. This achieves the effect of preventing scale from forming on the inner wall of the heat exchange pipes, which is difficult to clean, and facilitates the cleaning of scale formed on the heat exchange pipes, thereby improving the service life of the heat exchange pipes. Attached Figure Description

[0024] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this application;

[0025] Figure 2 This is a top view of the overall structure of this application;

[0026] Figure 3 This is a top view of the internal structure of the wastewater heat exchanger in this application;

[0027] Figure 4 This is a front sectional view of a partial structure of this application;

[0028] Figure 5 This is a schematic diagram showing the positional relationship between the heat exchange pipes and the support base in this application;

[0029] Figure 6 This is a schematic diagram of the connection structure between the sealing cap and the slot in this application.

[0030] In the picture:

[0031] 1. Boiler; 2. Sewage drain pipe; 3. Sewage heat exchanger; 4. Connecting pipe; 5. Sewage treatment mechanism; 6. Heat exchange pipe; 7. Treated water inlet pipe; 8. Treated water outlet pipe; 9. Partition plate; 10. Support base; 11. Sealing cover; 12. Slot; 13. First sealing gasket; 14. Second sealing gasket; 15. Recycling mechanism. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] Please see Figure 1 , Figure 3 and Figure 4This embodiment of a boiler wastewater recovery device for a thermal power plant includes a boiler 1. A wastewater drain pipe 2 is connected to one side of the boiler 1. One end of the wastewater drain pipe 2 is connected to one side of a wastewater heat exchange box 3. A connecting pipe 4 is connected to the other side of the wastewater heat exchange box 3. One end of the connecting pipe 4 is connected to a wastewater treatment mechanism 5. A heat exchange pipe 6 is provided inside the wastewater heat exchange box 3. One end of the heat exchange pipe 6 is connected to one end of a treated water inlet pipe 7 through a connecting flange. The other end of the treated water inlet pipe 7 extends to the outside of the wastewater heat exchange box 3 and is connected to the wastewater treatment mechanism 5. The other end of the heat exchange pipe 6 is connected to one end of a treated water outlet pipe 8 through a connecting flange. The other end of the treated water outlet pipe 8 extends to the outside of the wastewater heat exchange box 3 and is connected to the recovery mechanism 15.

[0034] Please see Figure 3 and Figure 4 The wastewater heat exchange box 3 is equipped with multiple partitions 9 inside. The multiple partitions 9 are staggered on both sides of the inner wall in the middle of the wastewater heat exchange box 3. The multiple partitions 9 cooperate with each other to form a serpentine wastewater heat exchange channel. The serpentine wastewater heat exchange channel formed by the cooperation of multiple partitions 9 can guide the flow of wastewater in the wastewater heat exchange box 3, so that the wastewater can be uniformly heat exchanged inside the wastewater heat exchange box 3.

[0035] Please see Figure 3 , Figure 4 and Figure 5 The heat exchange pipe 6 is arranged in a serpentine pattern. The serpentine heat exchange pipe 6 is located in the sewage heat exchange channel formed by the cooperation of multiple baffles 9. The shape of the heat exchange pipe 6 is adapted to the path of the sewage heat exchange channel formed by the cooperation of multiple baffles 9. The serpentine heat exchange pipe 6, in conjunction with the sewage heat exchange channel formed by the cooperation of multiple baffles 9, can increase the contact area between the sewage and the heat exchange pipe 6, so that the sewage can fully exchange heat with the low temperature water in the heat exchange pipe 6, and avoid waste of heat energy.

[0036] Please see Figure 3 , Figure 4 and Figure 5 The bottom of the inner wall of the sewage heat exchange box 3 is provided with multiple support seats 10 through support blocks. The support seats 10 are located below the heat exchange pipe 6. The support seats 10 can support the heat exchange pipe 6 in the sewage heat exchange box 3, improve the stability of the heat exchange pipe 6 in the sewage heat exchange box 3, prevent the heat exchange pipe 6 from deforming, and further improve the service life of the heat exchange pipe 6.

[0037] Please see Figure 1 and Figure 4A sealing cover 11 is provided on the top of the sewage heat exchange box 3. The sealing cover 11 is fixedly connected to the sewage heat exchange box 3 through an installation component. The sealing cover 11 can be easily removed from the top of the sewage heat exchange box 3 through the installation component, so as to facilitate the cleaning of the inside of the sewage heat exchange box 3 and the cleaning and maintenance of the outer surface of the heat exchange pipe 6 inside the sewage heat exchange box 3, thereby ensuring the heat exchange efficiency of the heat exchange pipe 6.

[0038] Please see Figure 1 , Figure 4 and Figure 6 A first sealing gasket 13 is provided between the sewage heat exchange box 3 and the sealing cover 11. The first sealing gasket 13 is located on the edge of the bottom outer surface of the sealing cover 11. The first sealing gasket 13 can seal the connection between the sealing cover 11 and the sewage heat exchange box 3, preventing sewage leakage from the sewage heat exchange box 3.

[0039] Please see Figure 4 and Figure 6 The bottom of the sealing cover 11 is provided with a slot 12. The inner wall of the slot 12 is fitted onto the outer surface above the partition 9. The slot 12 can further fix the position of the partition 9 and improve the stability of the partition 9 inside the sewage heat exchange box 3.

[0040] Please see Figure 4 and Figure 6 A second sealing gasket 14 is provided at the top of the inner wall of the slot 12. The second sealing gasket 14 is located between the top of the partition 9 and the top of the inner wall of the slot 12. The second sealing gasket 14 can seal the slot 12 and the partition 9, preventing sewage from flowing between the partition 9 and the slot 12 and causing the sewage to be unable to flow along the sewage heat exchange channel formed by the multiple partitions 9.

[0041] This embodiment of a boiler wastewater recovery device for a thermal power plant involves wastewater from the boiler 1 entering the wastewater heat exchange tank 3 through the wastewater drain pipe 2. Low-temperature water, treated by the wastewater treatment mechanism 5, then enters the heat exchange pipe 6. Inside the wastewater heat exchange tank 3, the wastewater exchanges heat with the low-temperature water inside the heat exchange pipe 6 via the outer surface of the heat exchange pipe 6. This allows the wastewater to exchange heat with the low-temperature water inside the heat exchange pipe 6 through the outer surface of the heat exchange pipe 6, preventing scale buildup on the difficult-to-clean inner wall of the heat exchange pipe 6. The device facilitates the cleaning of scale formed on the heat exchange pipe 6, thus improving the service life of the heat exchange pipe 6.

[0042] The working principle of the above embodiment is as follows: the sewage in the boiler 1 enters the sewage heat exchange box 3 through the sewage drain pipe 2. The sewage in the sewage heat exchange box 3 enters the sewage treatment mechanism 5 through the connecting pipe 4 for treatment. The low-temperature water after treatment by the sewage treatment mechanism 5 enters the heat exchange pipe 6 through the treated water inlet pipe 7. The sewage entering the sewage heat exchange box 3 flows through the sewage heat exchange channel formed by multiple partitions 9. Then, the sewage in the sewage heat exchange box 3 exchanges heat with the low-temperature water in the heat exchange pipe 6 through the outer surface of the heat exchange pipe 6. The water that has undergone heat exchange in the heat exchange pipe 6 enters the recovery mechanism 15 through the treated water outlet pipe 8 for water and heat energy recovery and utilization. When it is necessary to clean the scale formed on the outer surface of the middle part of the heat exchange pipe 6, the sealing cover 11 is separated from the sewage heat exchange box 3 by the installation component. The sealing cover 11 is removed from the sewage heat exchange box 3, and the outer surface of the heat exchange pipe 6 in the sewage heat exchange box 3 is cleaned.

[0043] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0044] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A thermal power plant boiler blowdown water recovery device, comprising a boiler (1), characterized in that: The boiler (1) is connected with a sewage drainage pipe (2) on one side, one end of the sewage drainage pipe (2) is connected to one side of a sewage heat exchange box (3), the other side of the sewage heat exchange box (3) is connected with a connecting pipeline (4), one end of the connecting pipeline (4) is connected to a sewage treatment mechanism (5), the sewage heat exchange box (3) is provided with a heat exchange pipeline (6) inside, one end of the heat exchange pipeline (6) is connected with one end of a treated water inlet pipe (7) through a connecting flange, the other end of the treated water inlet pipe (7) extends to the outside of the sewage heat exchange box (3) and is connected with the sewage treatment mechanism (5), the other end of the heat exchange pipeline (6) is connected with one end of a treated water outlet pipe (8) through a connecting flange, the other end of the treated water outlet pipe (8) extends to the outside of the sewage heat exchange box (3) and is connected with a recovery mechanism (15).

2. A thermal power plant boiler blowdown water recovery apparatus according to claim 1, characterized in that: The sewage heat exchange box (3) is provided with a plurality of partitions (9) inside, a plurality of the partitions (9) are staggered and arranged on the two sides of the inner wall in the middle of the sewage heat exchange box (3), and a plurality of the partitions (9) cooperate to form a serpentine sewage heat exchange channel.

3. A thermal power plant boiler blowdown water recovery apparatus according to claim 1, characterized in that: The heat exchange pipeline (6) is arranged in a serpentine shape, the heat exchange pipeline (6) arranged in a serpentine shape is located in the sewage heat exchange channel formed by the cooperation of a plurality of the partitions (9), and the shape of the heat exchange pipeline (6) is adapted to the path of the sewage heat exchange channel formed by the cooperation of a plurality of the partitions (9).

4. A thermal power plant boiler blowdown water recovery apparatus according to claim 1, characterized in that: The bottom of the inner wall of the sewage heat exchange box (3) is provided with a plurality of support seats (10) through support blocks, and the support seats (10) are located below the heat exchange pipeline (6).

5. A thermal power plant boiler blowdown water recovery apparatus according to claim 1, characterized in that: A sealing cover (11) is arranged above the sewage heat exchange box (3), and the sealing cover (11) and the sewage heat exchange box (3) are fixedly connected through a mounting assembly.

6. A thermal power plant boiler blowdown water recovery apparatus according to claim 5, characterized in that: A first sealing gasket (13) is arranged between the sewage heat exchange box (3) and the sealing cover (11), and the first sealing gasket (13) is arranged on the edge of the outer surface of the bottom of the sealing cover (11).

7. A thermal power plant boiler blowdown water recovery apparatus according to claim 5, characterized in that: A clamping groove (12) is arranged on the bottom of the sealing cover (11), and the inner wall of the clamping groove (12) is sleeved on the outer surface above the partition (9).

8. A thermal power plant boiler blowdown water recovery apparatus according to claim 7, characterized in that: A second sealing gasket (14) is arranged on the top of the inner wall of the clamping groove (12), and the second sealing gasket (14) is located between the top of the partition (9) and the top of the inner wall of the clamping groove (12).

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