A flue gas waste heat utilization device

Abstract

The utility model discloses a flue gas waste heat utilization device, including fixedly arranged waste heat boiler body, waste heat boiler body setting in the flue horizontal section between the induced draft fan and desulfurizing tower, waste heat boiler body is provided with the smoke inlet and the smoke outlet with the flue horizontal section intercommunication, be provided with heat exchange water pipe in waste heat boiler body, the ash guide bin is fixedly arranged below waste heat boiler body, the ash guide bin below is provided with the ash collection bin, and the ash collection bin is provided with the vibration component of avoiding soot bridging. The above -mentioned flue gas waste heat utilization device structure is reasonable, can reduce boiler exhaust gas temperature, reduce the waste of heat energy, improve the system overall thermal efficiency.

Description

Technical Field

[0001] This utility model relates to the field of waste heat boiler technology, and in particular to a device for utilizing waste heat from flue gas. Background Technology

[0002] The applicant's No. 2 boiler has a total of 640 secondary air preheaters, of which 201 are blocked due to air leakage. In March, when the temperature was 15℃, the highest flue gas temperature of No. 2 boiler was 207℃. In summer, when the temperature is 30℃, the flue gas temperature of the boiler will rise even higher. The bag filter of No. 2 boiler uses PTFE material bags, and the allowable long-term operating temperature is generally no more than 220℃. The desulfurization tower operates at a maximum temperature of 180℃, and the flue gas temperature is too high.

[0003] In actual operation, the flue gas temperature of Boiler No. 2 is relatively high, which not only reduces the boiler's thermal efficiency but also causes a considerable amount of heat energy waste.

[0004] Therefore, it is necessary to improve the existing flue gas waste heat utilization devices. Utility Model Content

[0005] The purpose of this invention is to overcome the defects in the existing technology and provide a flue gas waste heat utilization device that can reduce boiler exhaust temperature, reduce heat energy waste, and improve the overall thermal efficiency of the system.

[0006] To achieve the above technical effects, the technical solution of this utility model is as follows: a waste heat utilization device for flue gas, comprising a fixedly installed waste heat boiler body, wherein the waste heat boiler body is installed in the horizontal section of the flue between the induced draft fan and the desulfurization tower, the waste heat boiler body is provided with a flue gas inlet and a flue gas outlet communicating with the horizontal section of the flue, and a hot water exchange pipe is installed in the waste heat boiler body; an ash guide bin is fixedly installed below the waste heat boiler body, an ash collection bin is installed below the ash guide bin, and the ash collection bin is provided with a vibration component to prevent ash bridging.

[0007] According to one embodiment of the present invention, the ash collection bin is slidably connected to the ash guiding bin, and the sliding direction of the ash collection bin is vertically arranged; the vibration assembly includes a vibration motor, the vibration motor is fixedly connected to the outer shell of the ash collection bin, and the vibration direction of the vibration motor is vertically arranged.

[0008] According to one embodiment of the present invention, the ash guiding bin is fixedly provided with an upper mounting plate, the ash collecting bin is fixedly provided with a lower mounting plate, a bolt is passed through the upper mounting plate and the lower mounting plate, the bolt is threaded with a nut, and the upper mounting plate and the lower mounting plate are sandwiched between the end of the bolt and the nut.

[0009] According to one embodiment of the present invention, a compression spring is sandwiched between the upper mounting plate and the lower mounting plate.

[0010] According to one embodiment of the present invention, the compression spring is sleeved outside the shank of the bolt.

[0011] According to one embodiment of the present invention, a vibration interval is provided between the ash collection hopper and the ash guiding hopper, and a sealing connector is provided between the ash collection hopper and the ash guiding hopper, the sealing connector being deformable.

[0012] According to one embodiment of the present invention, the sealing connector includes a high-temperature resistant blanket, and the upper and lower ends of the high-temperature resistant blanket are respectively fixedly connected to the ash collection bin and the ash guiding bin.

[0013] According to one embodiment of the present invention, heat exchange fins are fixedly provided on the surface of the hot water pipe, and the heat exchange fins are inclined.

[0014] According to one embodiment of the present invention, the waste heat boiler body is externally fixedly provided with an inlet pipe and an outlet pipe communicating with the hot water exchange pipe. The inlet pipe is arranged adjacent to the flue gas outlet, and the outlet pipe is arranged adjacent to the flue gas inlet.

[0015] The advantages and beneficial effects of this utility model are as follows: The waste heat utilization device of this utility model has a reasonable structure. By setting up a waste heat boiler in the flue between the induced draft fan and the desulfurization tower, the utilization rate of high-temperature flue gas is improved, thereby reducing the boiler exhaust temperature, reducing heat energy waste, and improving the overall thermal efficiency of the system; the ash collection bin can also play a role in collecting ash, and the vibration component facilitates the discharge of dust in the ash collection bin. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an embodiment of the flue gas waste heat utilization device of this utility model; Figure 2 yes Figure 1 An explosion diagram; Figure 3 This is a structural diagram of a hot water pipe replacement system; Figure 4 This is a schematic diagram of the structure connecting the ash guiding hopper and the ash collecting hopper; Figure 5 yes Figure 4 An explosion diagram; In the diagram: 1. Waste heat boiler body; 11. Inlet pipe; 12. Outlet pipe; 2. Hot water exchange pipe; 21. Heat exchange fins; 3. Ash guide bin; 31. Upper mounting plate; 4. Ash collection bin; 41. Lower mounting plate; 5. Vibration motor; 6. Bolt; 61. Nut; 7. Compression spring; 8. High temperature resistant blanket. Detailed Implementation

[0017] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0018] In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "horizontal," "vertical," "top," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for 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 of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Example

[0019] like Figure 1-5 As shown, the waste heat utilization device for flue gas in this embodiment includes a fixedly installed waste heat boiler body 1, which is located in the horizontal section of the flue between the induced draft fan and the desulfurization tower. The waste heat boiler body 1 has an inlet and an outlet that communicate with the horizontal section of the flue. A hot water exchange pipe 2 is installed in the waste heat boiler body 1. An ash guide bin 3 is fixedly installed below the waste heat boiler body 1, and an ash collection bin 4 is installed below the ash guide bin 3. The ash collection bin 4 is equipped with a vibration component to prevent ash bridging.

[0020] This design reduces exhaust gas temperature, minimizes heat waste, and improves system thermal efficiency. The waste heat boiler body is set in the horizontal section of the flue between the induced draft fan and the desulfurization tower. The waste heat boiler body is equipped with a flue gas inlet and outlet that are connected to the flue gas. The internal hot water exchange pipe can directly contact the high-temperature flue gas to realize the recovery of waste heat from the flue gas.

[0021] This design effectively solves the problem of "excessively high flue gas temperature" in the original No. 2 boiler, avoids the waste of a large amount of heat energy caused by direct emission with the flue gas, and avoids damage to the bag filter caused by high-temperature flue gas.

[0022] To prevent soot buildup and blockage, and ensure stable operation of the equipment: Below the waste heat boiler body, an ash guiding bin and an ash collecting bin are arranged in sequence: the ash guiding bin can guide the flue gas ash to fall naturally to the ash collecting bin, realize the centralized collection of flue gas ash, and prevent the flue gas ash from accumulating in the boiler body or flue and affecting the heat exchange effect. The vibration component can break up clumps of soot through vibration, ensuring that soot in the ash collection bin can be discharged smoothly and guaranteeing the stable operation of the overall equipment.

[0023] According to one embodiment of the present invention, the ash collection bin 4 is slidably connected to the ash guiding bin 3, and the sliding direction of the ash collection bin 4 is vertically arranged; the vibration component includes a vibration motor 5, the vibration motor 5 is fixedly connected to the outer shell of the ash collection bin 4, and the vibration direction of the vibration motor 5 is vertically arranged.

[0024] This design adapts to vibration requirements, ensuring that the vibration effect reaches the ash directly.

[0025] According to one embodiment of the present invention, the ash guiding bin 3 is fixedly provided with an upper mounting plate 31, the ash collecting bin 4 is fixedly provided with a lower mounting plate 41, a bolt 6 is passed through the upper mounting plate 31 and the lower mounting plate 41, the bolt 6 is threadedly connected with a nut 61, and the upper mounting plate 31 and the lower mounting plate 41 are sandwiched between the end of the bolt 6 and the nut 61.

[0026] This design ensures a stable connection and guarantees structural reliability. The upper mounting plate (fixed to the ash guide hopper) and the lower mounting plate (fixed to the ash collection hopper) are connected by bolts and locked with nuts. The two are clamped between the ends of the bolts and the nuts, which can firmly limit the ash guide hopper and the ash collection hopper.

[0027] Reserving space for vibration to accommodate ash removal requirements: This connection method does not completely restrict the movement of the ash collection hopper; the fit between the bolts and the mounting plate provides the ash collection hopper with a margin for vertical movement.

[0028] According to one embodiment of the present invention, a compression spring 7 is sandwiched between the upper mounting plate 31 and the lower mounting plate 41.

[0029] This design buffers vibration and impact, protecting the connection structure. The upper mounting plate (fixed ash guide hopper) and the lower mounting plate (fixed ash collection hopper) are connected by bolts, and a compression spring is placed between the two to effectively buffer the vertical impact force generated when the vibration motor is working.

[0030] Maintaining vibration effectiveness helps to remove soot: The compression spring has elastic reset characteristics. When the vibrating motor drives the ash collection bin to vibrate up and down, it can provide a certain amount of room for movement for the ash collection bin (without limiting its vibration stroke), and it can also assist the ash collection bin to quickly reset through its own elasticity, thus enhancing the "up and down reciprocating vibration" effect of the ash collection bin.

[0031] According to one embodiment of the present invention, the compression spring 7 is sleeved on the outside of the shank of the bolt 6.

[0032] This design precisely limits the pressure spring, ensuring stable buffering and reset effects. The bolt rod provides clear "central support and limit" for the compression spring, which can prevent the compression spring from shifting, tilting or misaligning when under force.

[0033] Simplify assembly and maintenance, and improve structural reliability: The compression spring is directly fitted onto the bolt rod, eliminating the need for additional positioning and fixing of the compression spring during assembly. The installation of the compression spring can be completed simultaneously simply by passing the bolt through, simplifying the assembly process of the ash guide hopper and the ash collection hopper.

[0034] According to one embodiment of the present invention, a vibration interval is provided between the ash collection bin 4 and the ash guiding bin 3, and a sealing connector is provided between the ash collection bin 4 and the ash guiding bin 3, the sealing connector being deformable.

[0035] This design allows for reserved space for vibration, ensuring the effective operation of the vibration-assisted ash removal function. The "vibration gap" set between the ash collection bin and the ash guiding bin provides the ash collection bin with independent room for movement. The gap can prevent the ash guiding bin and the ash collection bin from colliding hard or obstructing each other, allowing the ash collection bin to freely complete up and down reciprocating vibration, ensuring that the vibration energy is fully applied to the soot inside the bin, ensuring that the soot falls and is discharged smoothly, and avoiding accumulation and blockage.

[0036] Deformable seals prevent flue gas leakage and environmental impact. Although a vibration interval is provided, the "deformable sealing connector" can fill the gap: on the one hand, the deformable characteristics are adapted to the vibration movement of the ash collection bin, and the rigid fixation of the seal will not restrict the movement of the ash collection bin, ensuring that the vibration ash discharge function is not affected; on the other hand, it can effectively seal the connection between the ash collection bin and the ash guide bin, preventing the high-temperature flue gas in the waste heat boiler body from leaking out of the gap, and also preventing the ash from leaking out.

[0037] According to one embodiment of the present invention, the sealing connector includes a high-temperature resistant blanket 8, the upper and lower ends of which are fixedly connected to the ash collection bin 4 and the ash guiding bin 3, respectively.

[0038] This design adapts to high-temperature operating conditions and ensures long-term stability: In the flue gas waste heat recovery device, the flue ash passing through the ash guide bin and ash collection bin, along with the surrounding environment, carries a high temperature (the original boiler exhaust temperature reaches a maximum of 207℃). The high-temperature resistant blanket possesses high humidity and heat resistance, enabling long-term use in such high-temperature environments without melting, breaking, or performance degradation due to high-temperature baking. This prevents ordinary sealing materials from failing due to high temperatures, thus avoiding flue gas leakage and ensuring a durable and effective sealing function, perfectly matching the core operating requirements of the device.

[0039] Balancing sealing and vibration control without affecting ash removal function: On the one hand, the upper and lower ends of the high-temperature resistant blanket are fixed to the ash collection bin and the ash guiding bin respectively, which can tightly fill the vibration gap between the two, effectively preventing high-temperature flue gas from leaking out of the gap, preventing additional heat loss, and also avoiding the impact of flue gas overflow on surrounding equipment or the environment; on the other hand, the high-temperature resistant blanket has deformable characteristics and can flexibly deform with the vertical vibration of the ash collection bin, without restricting the movement of the ash collection bin due to rigid sealing, ensuring that the vibration ash discharge function works normally.

[0040] According to one embodiment of the present invention, heat exchange fins 21 are fixedly provided on the surface of the hot water pipe 2, and the heat exchange fins 21 are inclined.

[0041] This design increases the heat exchange contact area and improves heat absorption efficiency. The heat exchange fins are fixed to the surface of the hot water pipe, which is equivalent to directly expanding the contact range between the hot water pipe and the high-temperature flue gas. This allows the water in the pipe to absorb the waste heat of the flue gas more quickly and in greater quantities, significantly increasing the heat recovery in a single heat exchange process, further reducing the exhaust temperature and minimizing heat waste.

[0042] The slanted design reduces ash buildup and ensures continuous and effective heat exchange. Ash carried in flue gas tends to accumulate on the surface of heat exchange components. If the fins are horizontally arranged, the ash tends to remain, hindering heat transfer and reducing heat exchange efficiency. However, the inclined fins can utilize gravity to allow the ash to slide more naturally into the ash guide and collection bins below, reducing the adhesion and accumulation of ash on the fin surface.

[0043] According to one embodiment of the present invention, the waste heat boiler body 1 is externally fixedly provided with an inlet pipe 11 and an outlet pipe 12 communicating with the hot water exchange pipe 2. The inlet pipe 11 is arranged adjacent to the flue gas outlet, and the outlet pipe 12 is arranged adjacent to the flue gas outlet.

[0044] This design maximizes the temperature difference and enhances heat transfer. It can maintain a large temperature difference between the water in the pipe and the flue gas, avoiding the problem of insufficient temperature difference when "cold water meets low temperature flue gas" and "hot water meets high temperature flue gas", significantly improving heat transfer efficiency and allowing cold water to absorb the waste heat of flue gas more fully.

[0045] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A flue gas waste heat utilization device, characterized by, The system includes a fixed waste heat boiler body (1), which is located in the horizontal section of the flue between the induced draft fan and the desulfurization tower. The waste heat boiler body (1) is provided with a flue gas inlet and a flue gas outlet that communicate with the horizontal section of the flue. A hot water exchange pipe (2) is provided in the waste heat boiler body (1). An ash guide bin (3) is fixedly installed below the waste heat boiler body (1). An ash collection bin (4) is installed below the ash guide bin (3). The ash collection bin (4) is provided with a vibration component to prevent ash bridging.

2. The flue gas waste heat utilization device according to claim 1, characterized in that, The ash collection bin (4) is slidably connected to the ash guiding bin (3), and the sliding direction of the ash collection bin (4) is vertically set; the vibration component includes a vibration motor (5), the vibration motor (5) is fixedly connected to the outer shell of the ash collection bin (4), and the vibration direction of the vibration motor (5) is vertically set.

3. The flue gas waste heat utilization device according to claim 2, characterized in that, The ash guiding hopper (3) is fixedly provided with an upper mounting plate (31), and the ash collecting hopper (4) is fixedly provided with a lower mounting plate (41). A bolt (6) is passed between the upper mounting plate (31) and the lower mounting plate (41). The bolt (6) is threaded with a nut (61). The upper mounting plate (31) and the lower mounting plate (41) are sandwiched between the end of the bolt (6) and the nut (61).

4. The flue gas waste heat utilization device according to claim 3, characterized in that, A compression spring (7) is sandwiched between the upper mounting plate (31) and the lower mounting plate (41).

5. The flue gas waste heat utilization device according to claim 4, characterized in that, The compression spring (7) is sleeved on the outside of the shank of the bolt (6).

6. The flue gas waste heat utilization device according to claim 5, characterized in that, A vibration gap is provided between the ash collection bin (4) and the ash guiding bin (3), and a sealing connector is provided between the ash collection bin (4) and the ash guiding bin (3), and the sealing connector is deformable.

7. The flue gas waste heat utilization device according to claim 6, characterized in that, The sealing connector includes a high-temperature resistant blanket (8), and the upper and lower ends of the high-temperature resistant blanket (8) are fixedly connected to the ash collection bin (4) and the ash guiding bin (3), respectively.

8. The flue gas waste heat utilization device according to claim 1, characterized in that, The surface of the hot water pipe (2) is fixedly provided with heat exchange fins (21), and the heat exchange fins (21) are inclined.

9. The flue gas waste heat utilization device according to claim 8, characterized in that, The waste heat boiler body (1) is fixedly provided with an inlet pipe (11) and an outlet pipe (12) that communicate with the hot water exchange pipe (2). The inlet pipe (11) is arranged adjacent to the flue gas outlet, and the outlet pipe (12) is arranged adjacent to the flue gas outlet.

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