A device for deeply recycling and utilizing waste heat of a boiler in a thermal power plant

Abstract

The utility model discloses a kind of thermal power plant boiler waste heat depth recycling device, it is related to heat recovery technical field, including bottom box, the top of bottom box is provided with top plate, the inside of top plate is provided with first serpentine pipe, one end of first serpentine pipe is communicated with first water inlet pipe, the other end of first serpentine pipe is communicated with first water outlet pipe, the connecting place of top plate and bottom box is provided with heat conduction sheet, the bottom of the front of bottom box is penetrated with air inlet pipe, the bottom end of air inlet pipe is penetrated with ash pipe, the end of air inlet pipe is connected with second serpentine pipe, the inside of second serpentine pipe is provided with multiple rolling balls, the utility model is provided with a series of structures, realize the cleaning of pipe cavity inner wall soot, to reduce the probability of pipe cavity inner wall thickening, reduce the probability of device heat conduction efficiency low due to pipe cavity wall too thick, to realize the depth utilization of device top heat, avoid the waste of device top heat.

Description

Technical Field

[0001] This utility model relates to the field of heat energy recovery technology, specifically a device for deep recovery and utilization of waste heat from boilers in thermal power plants. Background Technology

[0002] With the rapid development of industrialization, energy consumption is increasing day by day. In order to reduce the shortage caused by energy consumption, waste heat recovery technology has gradually received widespread attention. As an energy recovery and utilization technology, the application of waste heat recovery in industrial fields such as thermal power plants not only helps to save energy and reduce emissions, but also improves energy utilization efficiency. Therefore, waste heat recovery and utilization equipment has emerged.

[0003] In existing thermal power plant boilers, high-temperature flue gas passing through waste heat recovery devices is typically housed in elongated, narrow tubes to allow sufficient time for heat release. Although the flue gas undergoes dust removal before entering the device, dust particles still accumulate, causing the tube walls to thicken and reducing heat transfer efficiency. Furthermore, existing waste heat recovery devices usually pass the flue gas through the device's interior, transferring heat to the internal heat transfer medium. After this heat transfer, excess heat concentrates at the top of the device, which is often not fully utilized, resulting in heat waste. Utility Model Content

[0004] The purpose of this utility model is to provide a device for deep recovery and utilization of waste heat from boilers in thermal power plants, so as to solve the problem mentioned in the background art that the heat conduction efficiency of the device cavity will decrease due to ash accumulation, and the heat will not be fully utilized, resulting in unnecessary waste of heat.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a deep waste heat recovery and utilization device for thermal power plant boilers, comprising a bottom box, a top plate at the top of the bottom box, a first serpentine tube inside the top plate, one end of the first serpentine tube connected to a first water inlet pipe, the other end of the first serpentine tube connected to a first water outlet pipe, a heat-conducting plate at the connection between the top plate and the bottom box, an air inlet pipe penetrating the bottom of the front of the bottom box, an ash discharge pipe penetrating the bottom end of the air inlet pipe, a second serpentine tube connected to the end of the air inlet pipe, a plurality of rolling balls inside the second serpentine tube, an air outlet pipe connected to the end of the second serpentine tube, a connecting pipe penetrating one side wall of the air outlet pipe, a high-speed fan at the bottom of the connecting pipe, solenoid valves at the front end of the air inlet pipe and the end of the air outlet pipe, and a heat transfer medium filling the interior of the bottom box.

[0006] Preferably, a vertical cylinder extends through the top of the vent pipe, and sealing plugs are provided at the top of the vertical cylinder and the bottom of the ash discharge pipe.

[0007] Preferably, the ball is slidably connected to the air outlet pipe via a vertical cylinder.

[0008] Preferably, a second water inlet pipe is passed through the bottom of one side wall of the base box, and a second water outlet pipe is passed through the top of the other side wall of the base box. The second water inlet pipe is connected to the interior of the second water outlet pipe through the base box.

[0009] Preferably, the heat-conducting plate is located at the bottom of the first serpentine tube and at the top of the second serpentine tube.

[0010] Preferably, a one-way valve is provided at the connection between the connecting pipe and the air outlet pipe, and the bottom end of the connecting pipe is connected to the air outlet of the high-speed fan.

[0011] Preferably, both the first inlet pipe and the first outlet pipe pass through one side wall of the top plate, and the first inlet pipe is connected to the interior of the first outlet pipe through a first serpentine pipe.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. This waste heat recovery and utilization device for boilers in thermal power plants, through a high-speed fan, connecting pipe, ball bearing, solenoid valve, and ash discharge pipe, enables the pipe cavity used to transport high-temperature flue gas to be cleaned by the high-speed airflow blown out by the high-speed fan and the impact of the ball bearing sliding along the pipe cavity and generating vibration. The ash accumulated in the pipe cavity is blown back from the outlet pipe to the ash discharge pipe at the inlet pipe, thereby reducing the probability of the inner wall of the pipe cavity becoming thicker and reducing the probability of the device's heat conduction efficiency becoming lower due to the excessive thickness of the pipe cavity wall.

[0014] 2. The waste heat recovery and utilization device of this thermal power plant boiler, through the top plate, heat conduction plate, first water inlet pipe and first water outlet pipe, enables the heat accumulated at the top of the recovery and utilization device to be absorbed again by the top plate set at the top of the device, so that this part of the heat can be absorbed through the additional heat transfer medium, thereby realizing the deep utilization of the heat at the top of the device and avoiding the waste of the heat at the top of the device. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the vertical cylinder and rolling ball structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the top plate and heat-conducting sheet structure of this utility model;

[0018] Figure 4 This is a schematic diagram of the high-speed fan and connecting pipe structure of this utility model.

[0019] In the diagram: 1. Air outlet pipe; 2. Solenoid valve; 3. Vertical cylinder; 4. Connecting pipe; 5. Top plate; 6. First water inlet pipe; 7. Second water inlet pipe; 8. Bottom box; 9. First water outlet pipe; 10. Ash discharge pipe; 11. Air inlet pipe; 12. Second water outlet pipe; 13. First serpentine tube; 14. Heat-conducting plate; 15. Heat transfer medium; 16. Second serpentine tube; 17. High-speed fan; 18. Check valve; 19. Ball bearing. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] like Figures 1 to 4As shown, the waste heat recovery and utilization device for thermal power plant boilers in this embodiment includes a bottom box 8, a top plate 5 at the top of the bottom box 8, a first serpentine tube 13 inside the top plate 5, a first water inlet pipe 6 at one end of the first serpentine tube 13, a first water outlet pipe 9 at the other end of the first serpentine tube 13, a heat-conducting plate 14 at the connection between the top plate 5 and the bottom box 8, an air inlet pipe 11 penetrating through the bottom of the front of the bottom box 8, an ash discharge pipe 10 penetrating through the bottom end of the air inlet pipe 11, a second serpentine tube 16 at the end of the air inlet pipe 11, a plurality of rolling balls 19 inside the second serpentine tube 16, an air outlet pipe 1 at the end of the second serpentine tube 16, a connecting pipe 4 penetrating through one side wall of the air outlet pipe 1, a high-speed fan 17 at the bottom of the connecting pipe 4, a solenoid valve 2 at the front end of the air inlet pipe 11 and the end of the air outlet pipe 1, and a heat transfer medium 15 filling the inside of the bottom box 8.

[0024] Specifically, the top surface of the bottom box 8 coincides with the bottom surface of the top plate 5, and both the bottom box 8 and the inner walls of the top plate 5 are equipped with heat insulation layers. This prevents heat entering the bottom box 8 and the top plate 5 from easily dissipating through their outer shells, thus reducing unnecessary heat waste. The first serpentine tube 13 allows the heat transfer medium 15 to flow along a predetermined path within the top plate 5, facilitating the full absorption of heat from the top of the device by the heat transfer medium 15 within the top plate 5. The first inlet pipe 6 and the first outlet pipe 9 allow the heat transfer medium 15 to smoothly enter the first serpentine tube 13 and then flow out, respectively, thereby achieving deep utilization of the heat accumulated at the top of the device. The heat-conducting plate 14 allows the heat from the top of the bottom box 8 to quickly pass through the top of the bottom box 8 and enter the top plate 5, thus facilitating the absorption of heat from the heat transfer medium 15 within the first serpentine tube 13 of the top plate 5. The function of the intake pipe 11 is to allow the high-temperature flue gas carrying residual heat from the boiler of the thermal power plant to smoothly enter the device, thereby realizing the utilization of residual heat. The ash discharge pipe 10 is set at the intake pipe 11. Its function is to allow the ash accumulated in the second serpentine pipe 16 to be loosened by the ball bearing 19 and then cleaned and gathered by the high-speed fan 17, so that the ash accumulates more and more and can form larger dust particles. So that the dust particles can form larger impurities and roll off from the bottom of the intake pipe 11, thereby realizing the discharge of ash in the pipe cavity. The ball bearing 19 is made of silicone and has a rough surface. When it collides with the inner wall of the second serpentine pipe 16, it is not easy to cause great damage to the inner wall of the second serpentine pipe 16. The function of the high-speed fan 17 is to blow high-speed airflow into the second serpentine pipe 16, so that the ash attached to the pipe cavity of the second serpentine pipe 16 can be blown off and collected at the intake pipe 11, thereby realizing the cleaning of the ash in the pipe cavity.

[0025] Furthermore, a vertical cylinder 3 passes through the top of the vent pipe 1. Both the top of the vertical cylinder 3 and the bottom of the ash discharge pipe 10 are equipped with sealing plugs. The function of the vertical cylinder 3 is to facilitate the placement of the rolling ball 19 into the pipe cavity when cleaning the accumulated ash in the pipe cavity, so that the rolling ball 19 can enter the second serpentine pipe 16 through the vent pipe 1.

[0026] Furthermore, the ball 19 is slidably connected to the air outlet pipe 1 via the vertical cylinder 3, allowing the ball 19 to slide into the second serpentine pipe 16 along the inclined air outlet pipe 1. Under the influence of gravity and high-speed airflow, the ball 19 rolls along the inner wall of the second serpentine pipe 16, thereby promoting the loosening and removal of the dust accumulated inside the second serpentine pipe 16, which is beneficial for cleaning the dust accumulated inside the second serpentine pipe 16.

[0027] Furthermore, a second water inlet pipe 7 is passed through the bottom of one side wall of the bottom box 8, and a second water outlet pipe 12 is passed through the top of the other side wall of the bottom box 8. The second water inlet pipe 7 communicates with the interior of the second water outlet pipe 12 through the bottom box 8. The second water inlet pipe 7 and the second water outlet pipe 12 enable the heat transfer medium 15 to flow from the bottom to the top of the bottom box 8, thereby facilitating the discharge of the heat transfer medium 15 from the bottom box 8 after it has fully absorbed heat.

[0028] Furthermore, the heat-conducting plate 14 is located at the bottom of the first serpentine tube 13 and at the top of the second serpentine tube 16, so that the heat accumulated at the top of the bottom box 8 can be quickly conducted to the first serpentine tube 13 through the heat-conducting plate, thereby facilitating the heat transfer medium 15 in the first serpentine tube 13 to absorb heat, and thus realizing the deep utilization of the heat at the top of the bottom box 8.

[0029] Furthermore, a one-way valve 18 is provided at the connection between the connecting pipe 4 and the outlet pipe 1. The bottom end of the connecting pipe 4 is connected to the outlet of the high-speed fan 17. The function of the one-way valve 18 is to prevent flue gas from entering the connecting pipe 4, thereby reducing the interference caused by the flow of flue gas between the connecting pipe 4 and the outlet pipe 1.

[0030] Furthermore, the first inlet pipe 6 and the first outlet pipe 9 both penetrate one side wall of the top plate 5. The first inlet pipe 6 is connected to the interior of the first outlet pipe 9 through the first serpentine pipe 13, so that the heat transfer medium 15 can flow smoothly along the first serpentine pipe 13 inside the top plate 5, thereby realizing the deep utilization of the heat at the top of the bottom box 8.

[0031] The usage method of this embodiment is as follows: When using this deep waste heat recovery and utilization device for thermal power plant boilers, the device needs to be connected to an external power supply first. Then, the boiler flue gas after dust removal is introduced into the inlet pipe 11. At this time, the flue gas will enter the second serpentine tube 16 through the inlet pipe 11, and then be discharged along the outlet pipe 1 at the end of the second serpentine tube 16. At this time, the heat transfer medium 15 entering the bottom box 8 through the second water inlet pipe 7 will wrap around the outer wall of the second serpentine tube 16, so that the flue gas inside the second serpentine tube 16 will transfer heat to the heat transfer medium 15 in the bottom box 8 through the pipe wall. Then, the heat-absorbing heat transfer medium 15 will be discharged from the second water outlet pipe 12. At the same time, the heat transfer medium 15 can be introduced into the first water inlet pipe 6, so that the heat transfer medium 15 flows in the first serpentine tube 13 of the top plate 5, and conducts the heat accumulated at the top of the bottom box 8 to the heat-conducting plate 14. The first serpentine tube 13 allows for deep utilization of the heat at the top of the bottom box 8. When the device is in use and the accumulated dust on the inner wall of the second serpentine tube 16 needs to be cleaned, the rolling ball 19 can be first placed into the air outlet pipe 1 through the vertical cylinder 3. Then, the vertical cylinder 3 is sealed with a sealing plug, and the solenoid valves 2 at the air inlet pipe 11 and the air outlet pipe 1 are closed. Then, the bottom end of the ash discharge pipe 10 is opened, and the high-speed fan 17 is started. The high-speed fan 17 passes a high-speed airflow into the air outlet pipe 1 through the connecting pipe 4, which drives the rolling ball 19 to roll along the inner wall of the second serpentine tube 16 and collide with the inner wall of the second serpentine tube 16. This loosens the accumulated dust on the inner wall of the second serpentine tube 16, and the dust is blown towards the ash discharge pipe 10 under the action of the high-speed airflow until the rolling ball 19 slides out of the ash discharge pipe 10. This completes the dust removal process of the inner cavity of the device.

[0032] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for deep recovery and utilization of waste heat from boilers in thermal power plants, comprising a bottom box (8), characterized in that: The top of the bottom box (8) is provided with a top plate (5), and a first serpentine tube (13) is provided inside the top plate (5). One end of the first serpentine tube (13) is connected to a first water inlet pipe (6), and the other end of the first serpentine tube (13) is connected to a first water outlet pipe (9). A heat-conducting plate (14) is provided at the connection between the top plate (5) and the bottom box (8). An air inlet pipe (11) passes through the bottom of the front of the bottom box (8), and an ash discharge pipe (10) passes through the bottom end of the air inlet pipe (11). The end of the air pipe (11) is connected to a second serpentine pipe (16), and the inside of the second serpentine pipe (16) is provided with multiple rolling balls (19). The end of the second serpentine pipe (16) is connected to an air outlet pipe (1). A connecting pipe (4) runs through one side wall of the air outlet pipe (1). A high-speed fan (17) is provided at the bottom of the connecting pipe (4). A solenoid valve (2) is provided at the front end of the air inlet pipe (11) and the end of the air outlet pipe (1). The bottom box (8) is filled with a heat transfer medium (15).

2. The device for deep recovery and utilization of waste heat from a thermal power plant boiler according to claim 1, characterized in that: The top end of the air outlet pipe (1) is through a vertical cylinder (3), and the top end of the vertical cylinder (3) and the bottom end of the ash discharge pipe (10) are both provided with sealing plugs.

3. The device for deep recovery and utilization of waste heat from a thermal power plant boiler according to claim 2, characterized in that: The ball (19) is slidably connected to the air outlet pipe (1) via the vertical cylinder (3).

4. The device for deep recovery and utilization of waste heat from a thermal power plant boiler according to claim 1, characterized in that: A second water inlet pipe (7) is passed through the bottom of one side wall of the bottom box (8), and a second water outlet pipe (12) is passed through the top of the other side wall of the bottom box (8). The second water inlet pipe (7) is connected to the interior of the second water outlet pipe (12) through the bottom box (8).

5. The device for deep recovery and utilization of waste heat from a thermal power plant boiler according to claim 1, characterized in that: The heat-conducting plate (14) is located at the bottom of the first serpentine tube (13) and at the top of the second serpentine tube (16).

6. The device for deep recovery and utilization of waste heat from a thermal power plant boiler according to claim 1, characterized in that: A one-way valve (18) is provided at the connection between the connecting pipe (4) and the air outlet pipe (1), and the bottom end of the connecting pipe (4) is connected to the air outlet of the high-speed fan (17).

7. The device for deep recovery and utilization of waste heat from a thermal power plant boiler according to claim 1, characterized in that: The first inlet pipe (6) and the first outlet pipe (9) both penetrate through one side wall of the top plate (5). The first inlet pipe (6) is connected to the interior of the first outlet pipe (9) through the first serpentine pipe (13).

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