Desulfurized flue gas waste heat recycling system with water-saving structure

Abstract

The utility model discloses a desulfurized flue gas waste heat recycling system with a water-saving structure, which relates to the technical field of desulfurized flue gas waste heat recycling systems and comprises a desulfurizing tower, a liquid storage tank, a sprayer, a flue gas outlet, a gas inlet pipe and an induced draft fan. Uniformly distributed sprayers are arranged at the top end of the desulfurization tower, and a flue gas exhaust port is formed in the top end of the desulfurization tower. According to the desulfurized flue gas waste heat recycling system with the water-saving structure, original desulfurized flue gas is injected into the desulfurizing tower through the induced draft fan from the gas inlet pipe, the flue gas can make contact with slurry to remove SO2 gas, then heat of water in the heat exchanger is extracted through the heat pump unit, a heat supply network water return pipe and a heat supply network water supply pipe are heated, and the heat supply network water supply pipe is heated; meanwhile, the temperature of the desulfurized clean flue gas is reduced, the water supplementing amount of the system is reduced, and the desulfurized flue gas waste heat recycling system can have the good water saving effect when used.

Description

Technical Field

[0001] This utility model relates to the technical field of desulfurization flue gas waste heat recovery and utilization system, specifically a desulfurization flue gas waste heat recovery and utilization system with a water-saving structure. Background Technology

[0002] Wet desulfurization is currently the most widely used desulfurization process in power plants, with a relatively stable system and mature technology. After the flue gas exchanges heat with the boiler air preheater, it is reduced to 130-150℃. The flue gas, after being dusted by the dust collector, is sent into the desulfurization tower by the induced draft fan for desulfurization.

[0003] However, the flue gas discharged from the induced draft fan at 130-150℃ enters the absorption tower and reacts with the spray slurry for heat exchange. After the water vapor in the desulfurization tower evaporates and takes away a large amount of heat, the exhaust temperature is 50-60℃. The cooling process of the flue gas in the tower causes a large amount of heat loss. At the same time, saturated flue gas is generated, and a large amount of water vapor is discharged into the atmosphere with the flue gas. Meanwhile, the process of the flue gas cooling from 130-150℃ to 50-60℃ takes place in the absorption tower, and the heat is discharged into the atmosphere in the form of water vapor in the flue gas. This process wastes a lot of heat source. Utility Model Content

[0004] The purpose of this invention is to provide a desulfurization flue gas waste heat recovery and utilization system with a water-saving structure, so as to solve the problem that the desulfurization flue gas waste heat recovery and utilization system is not easy to save water as mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a desulfurization flue gas waste heat recovery and utilization system with a water-saving structure, comprising a desulfurization tower, a liquid storage tank, sprayers, a flue gas outlet, an air inlet pipe, and an induced draft fan. The bottom of the desulfurization tower is provided with a liquid storage tank, the top of the desulfurization tower is provided with uniformly distributed sprayers, the top of the desulfurization tower has a flue gas outlet, an air inlet pipe is provided on one side of the desulfurization tower, an induced draft fan is connected to one side of the air inlet pipe, a connecting pipe connected to the desulfurization tower is connected to one side of the induced draft fan through the air inlet pipe, a heat exchanger is installed between the connecting pipe and the induced draft fan, a water inlet pipe is connected to the top of the heat exchanger, and a water outlet pipe is provided on the side of the heat exchanger away from the water inlet pipe.

[0006] Preferably, a waste heat recovery water pump is installed on the side of the water outlet pipe away from the heat exchanger, and a heat pump unit is connected to one end of both the water outlet pipe and the water inlet pipe.

[0007] Preferably, a heat network return water pipe is provided on one side of the heat pump unit, a hot water pump is connected between the heat network return water pipe and the heat pump unit, and a heat network supply water pipe is provided at the end of the heat pump unit near the heat network return water pipe.

[0008] Preferably, the connecting pipe is provided with a dust removal plate inside, the bottom end of the connecting pipe is provided with a docking seat, the docking seat is provided with a positioning block for welding connection inside, and the positioning block is provided with symmetrically distributed limiting blocks inside.

[0009] Preferably, a limiting spring is connected between the two limiting blocks, symmetrically distributed positioning rods are provided at the top end of the connecting tube, and rotating seats are provided on both sides of the connecting tube through a rotating shaft.

[0010] Preferably, one end of the rotating seat is provided with an adjusting seat.

[0011] Preferably, the adjusting seat has a limiting rod inside that is welded to the rotating seat, and a return spring is connected between the limiting rod and the adjusting seat.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: In this desulfurization flue gas waste heat recovery and utilization system with a water-saving structure, the raw desulfurization flue gas is injected into the desulfurization tower through the inlet pipe by an induced draft fan. The flue gas can contact the slurry to remove SO2 gas. Then, the heat of the water in the heat exchanger is extracted by the heat pump unit to heat the heat network return water pipe and the heat network supply water pipe, thereby realizing the waste heat recovery of the desulfurization slurry system. At the same time, the temperature of the desulfurized flue gas is reduced, and the system water replenishment is reduced, so that the desulfurization flue gas waste heat recovery and utilization system can have a better water-saving effect when in use.

[0013] 1. This desulfurization flue gas waste heat recovery system with water-saving structure allows the desulfurization raw flue gas at 110-140℃ to be injected into the desulfurization tower through the inlet pipe by an induced draft fan. The flue gas comes into counter-current contact with the slurry sprayed by the sprayer from bottom to top, and SO2 gas can be removed during the contact. The slurry sprayed by the sprayer is drawn from the storage tank at the bottom of the desulfurization tower by the slurry delivery pump and transported into the sprayer through the pipeline for spraying. A heat exchanger is installed between the inlet pipe and the connecting pipe to exchange heat with water, so that the temperature of the slurry can be reduced to 46-50℃. Then, the heat of the water in the heat exchanger is extracted by the heat pump unit to heat the heat network return water pipe and the heat network supply water pipe, realizing the waste heat recovery of the desulfurization slurry system. At the same time, the temperature of the desulfurized flue gas is reduced, and the system water replenishment is reduced, so that the desulfurization flue gas waste heat recovery system has a good water-saving effect during use.

[0014] 2. In this desulfurization flue gas waste heat recovery system with a water-saving structure, it is often difficult to remove dust from the flue gas during use. Prolonged use can lead to a buildup of dust inside the system, affecting the recovery efficiency. To address this, a dust removal plate can be inserted and aligned with a positioning block inside the docking seat, secured by a limit block. Rotating the rotating seat then rotates the connected adjusting seat, which in turn moves the adjusting seat. Pulling the adjusting seat allows it to move on the limit rod surface, simultaneously compressing the return spring and ensuring quick contact between the adjusting seat and the positioning rod. This ensures the dust removal plate is stable after installation, effectively filtering dust from the flue gas and preventing its accumulation inside. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main sectional view of the present invention;

[0016] Figure 2 This is a schematic diagram of the front sectional view of the connecting pipe of this utility model;

[0017] Figure 3 This is a schematic diagram of the front sectional view of the docking seat of this utility model;

[0018] Figure 4 This is a front view sectional view of the adjustment seat of this utility model.

[0019] In the diagram: 1. Desulfurization tower; 2. Liquid storage tank; 3. Sprayer; 4. Flue gas outlet; 5. Inlet pipe; 6. Exhaust fan; 7. Connecting pipe; 8. Heat exchanger; 9. Water inlet pipe; 10. Water outlet pipe; 11. Waste heat recovery water pump; 12. Heat pump unit; 13. Heating network return water pipe; 14. Hot water supply pump; 15. Heating network supply water pipe; 16. Dust collector plate; 17. Connecting seat; 18. Positioning block; 19. Limiting block; 20. Limiting spring; 21. Positioning rod; 22. Rotating seat; 23. Adjusting seat; 24. Limiting rod; 25. Return spring. 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] Please see Figure 1This utility model provides a technical solution: a desulfurization flue gas waste heat recovery and utilization system with a water-saving structure, including a desulfurization tower 1, a liquid storage tank 2, sprayers 3, a flue gas outlet 4, an air inlet pipe 5, and an induced draft fan 6. The bottom of the desulfurization tower 1 is equipped with the liquid storage tank 2, and the top of the desulfurization tower 1 is equipped with evenly distributed sprayers 3. The top of the desulfurization tower 1 has a flue gas outlet 4. An air inlet pipe 5 is provided on one side of the desulfurization tower 1, and an induced draft fan 6 is connected to one side of the air inlet pipe 5. A connecting pipe 7, which is connected to the desulfurization tower 1, is connected to one side of the induced draft fan 6 via the air inlet pipe 5. A heat exchanger 8 is installed between the connecting pipe 7 and the induced draft fan 6. A water inlet pipe 9 is connected to the top of the heat exchanger 8. A water outlet pipe 10 is provided on the side of the heat exchanger 8 away from the water inlet pipe 9. A waste heat recovery water pump 11 is installed on the side of the water outlet pipe 10 away from the heat exchanger 8. A heat pump unit 12 is connected to one end of both the water outlet pipe 10 and the water inlet pipe 9. A heat network return water pipe 13 is provided on one side of the heat pump unit 12. A hot water supply pump 14 is connected between the heat network return water pipe 13 and the heat pump unit 12. A heat network supply water pipe 15 is provided at the end of the heat pump unit 12 near the heat network return water pipe 13.

[0022] In practice,

[0023] See Figure 1 It can be seen that when the desulfurization flue gas at 110-140℃ is injected into the desulfurization tower 1 through the inlet pipe 5 and the induced draft fan 6, the flue gas comes into countercurrent contact with the slurry sprayed by the sprayer 3 from bottom to top, and SO2 gas can be removed at the same time. The slurry sprayed by the sprayer 3 is drawn from the storage tank 2 set at the bottom of the desulfurization tower 1 by the slurry delivery pump and transported into the sprayer 3 for spraying through the pipeline. A heat exchanger 8 is installed between the inlet pipe 5 and the connecting pipe 7, so that heat can be exchanged with water, and the temperature of the slurry can be reduced to 46-50℃. Then, the heat of the water in the heat exchanger 8 is extracted by the heat pump unit 12 to heat the heat network return water pipe 13 and the heat network supply water pipe 15, realizing the waste heat recovery of the desulfurization slurry system. At the same time, the temperature of the desulfurization clean flue gas is reduced, the system water replenishment is reduced, so that the desulfurization flue gas waste heat recovery and utilization system can have a good water-saving effect when in use.

[0024] The connecting pipe 7 has a dust removal plate 16 inside, a docking seat 17 at the bottom end, a positioning block 18 welded inside the docking seat 17, a symmetrically distributed limiting block 19 inside the positioning block 18, a limiting spring 20 connecting two of the limiting blocks 19, a symmetrically distributed positioning rod 21 at the top end of the connecting pipe 7, and a rotating seat 22 rotatably connected to both sides of the connecting pipe 7 via a rotating shaft. An adjusting seat 23 is provided at one end of the rotating seat 22, a limiting rod 24 welded to the rotating seat 22 inside the adjusting seat 23, and a return spring 25 connecting the limiting rod 24 and the adjusting seat 23.

[0025] In practice,

[0026] See Figures 1-4 It is known that when a desulfurization flue gas waste heat recovery system is in use, it is usually not easy to remove dust from the flue gas. This can lead to a large amount of dust adhering to the inside of the system after prolonged use, thus affecting the recovery effect. By inserting the dust removal plate 16, it can be connected to the positioning block 18 inside the docking seat 17 and restricted by the limit block 19. Then, the rotating seat 22 is rotated, which rotates the connected adjusting seat 23. The adjusting seat 23 is then pulled, allowing it to move on the surface of the limit rod 24 and press the return spring 25, so that the adjusting seat 23 can quickly contact the positioning rod 21. This ensures that the dust removal plate 16 is relatively stable after installation, allowing it to filter dust from the flue gas and prevent dust from accumulating inside.

[0027] In summary, wet desulfurization is currently the most widely used, relatively stable, and technologically mature desulfurization process in power plants. The raw flue gas for desulfurization is injected into the desulfurization tower 1 through the inlet pipe 5 and the induced draft fan 6. The flue gas can contact the slurry to remove SO2 gas. Subsequently, the heat is extracted from the water in the heat exchanger 8 by the heat pump unit 12 to heat the heat network return water pipe 13 and the heat network supply water pipe 15, realizing the recovery of waste heat from the desulfurization slurry system. At the same time, the temperature of the clean flue gas from desulfurization is reduced, and the system makeup water consumption is reduced, so that the waste heat recovery and utilization system for desulfurization flue gas can have a good water-saving effect during use. The contents not described in detail in this description are existing technologies known to those skilled in the art.

[0028] Although the present invention 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 the present invention should be included within the protection scope of the present invention.

Claims

1. A desulfurization flue gas waste heat recovery and utilization system with a water-saving structure, comprising a desulfurization tower (1), a liquid storage tank (2), a sprayer (3), a flue gas outlet (4), an air inlet pipe (5), and an induced draft fan (6), characterized in that: The desulfurization tower (1) is provided with a liquid storage tank (2) at the bottom end, and a uniformly distributed sprayer (3) is provided at the top end of the desulfurization tower (1). A flue gas outlet (4) is provided at the top end of the desulfurization tower (1). An air inlet pipe (5) is provided on one side of the desulfurization tower (1). An induced draft fan (6) is connected to one side of the air inlet pipe (5). A connecting pipe (7) connected to the desulfurization tower (1) is connected to one side of the induced draft fan (6) through the air inlet pipe (5). A heat exchanger (8) is installed between the connecting pipe (7) and the induced draft fan (6). A water inlet pipe (9) is connected to the top end of the heat exchanger (8). A water outlet pipe (10) is provided on the side of the heat exchanger (8) away from the water inlet pipe (9).

2. The desulfurization flue gas waste heat recovery and utilization system with a water-saving structure according to claim 1, characterized in that: A waste heat recovery water pump (11) is installed on the side of the water outlet pipe (10) away from the heat exchanger (8), and a heat pump unit (12) is connected to one end of both the water outlet pipe (10) and the water inlet pipe (9).

3. The desulfurization flue gas waste heat recovery and utilization system with a water-saving structure according to claim 2, characterized in that: A heat network return water pipe (13) is provided on one side of the heat pump unit (12), and a hot water pump (14) is connected between the heat network return water pipe (13) and the heat pump unit (12). A heat network supply water pipe (15) is provided at one end of the heat pump unit (12) near the heat network return water pipe (13).

4. The desulfurization flue gas waste heat recovery and utilization system with a water-saving structure according to claim 1, characterized in that: The connecting pipe (7) is provided with a dust removal plate (16) inside, and a docking seat (17) is provided at the bottom end of the connecting pipe (7). The docking seat (17) is provided with a welding connection positioning block (18) inside, and a symmetrically distributed limiting block (19) is provided inside the positioning block (18).

5. A desulfurization flue gas waste heat recovery and utilization system with a water-saving structure according to claim 4, characterized in that: A limiting spring (20) is connected between the two limiting blocks (19), and a symmetrically distributed positioning rod (21) is provided at the top of the connecting tube (7). A rotating seat (22) is provided on both sides of the connecting tube (7) and is rotatably connected by a rotating shaft.

6. A desulfurization flue gas waste heat recovery and utilization system with a water-saving structure according to claim 5, characterized in that: An adjusting seat (23) is provided at one end of the rotating seat (22).

7. A desulfurization flue gas waste heat recovery and utilization system with a water-saving structure according to claim 6, characterized in that: The adjusting seat (23) is provided with a limiting rod (24) that is welded to the rotating seat (22), and a return spring (25) is connected between the limiting rod (24) and the adjusting seat (23).

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