Novel desulfurization circulating slurry waste heat recovery device arranged in situ

Abstract

The utility model provides a novel desulfurization circulating slurry waste heat recovery device arranged in situ, which comprises a desulfurization tower and a desulfurization slurry pond, the desulfurization slurry pond is positioned in the inner cavity of the desulfurization tower, the inner cavity of the desulfurization tower is respectively provided with a spray pipe and a demister, and the spray pipe is communicated with the demister. The desulfurization tower is provided with a flue gas pipe and a heat exchange mechanism, a supporting mechanism is arranged at the bottom of the heat exchange mechanism, the heat exchange mechanism comprises a liquid outlet pipe, a spiral sleeve heat exchanger is arranged on one side of the liquid outlet pipe, one end of the spiral sleeve heat exchanger is communicated with a circulating pump through a pipeline, and a water outlet of the circulating pump is communicated with the spraying pipe through a conveying pipe. The novel desulfurization circulating slurry waste heat recovery device arranged in situ solves the problems that the waste heat recovery technology in the prior art is large in investment, complex in system, large in influence on normal operation of original equipment, not easy to arrange and difficult to operate and overhaul.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery, in particular to a novel desulfurization circulating slurry waste heat recovery device arranged in situ. Background Art

[0002] In conventional coal-fired thermal power plants, exhaust gas loss is the primary component of boiler heat loss. Exhaust gas loss is primarily determined by the exhaust gas temperature at the boiler's air preheater outlet. The exhaust gas temperature of conventional coal-fired boilers is generally designed to be between 120°C and 130°C, and exhaust gas loss accounts for approximately 70% of boiler heat loss. Therefore, comprehensive utilization of waste heat from boiler exhaust gas is crucial for improving overall unit economics. Currently, most coal-fired boiler flue gas uses wet limestone desulfurization. The desulfurization slurry (limestone slurry) comes into direct contact with the flue gas, cooling the flue gas from approximately 110°C to approximately 55°C, and then heating the slurry to approximately 55°C. A large amount of slurry must be stored in the desulfurization tower for circulating desulfurization with the flue gas. The slurry temperature is generally maintained at approximately 55°C. Desulfurization operates year-round, and the slurry contains a significant amount of waste heat. Currently, the heat from the slurry is generally wasted and not recovered. High slurry temperatures can also cause white mist in the exhaust gas.

[0003] Existing boiler exhaust waste heat utilization technology:

[0004] 1. Install a flue gas heat exchanger, such as a low-temperature economizer, on the flue. (Disadvantages: ① The flue gas heat exchanger is large in size and requires a large investment; ② It increases the flue gas resistance and the power consumption of the induced draft fan; ③ The required renovation space is large and difficult to arrange; ④ The corrosion problem of the heat exchanger is difficult to solve.)

[0005] 2. Install a flue gas direct contact spray tower and heat pump after the desulfurization tower to recover the waste heat from the low-temperature flue gas. (Disadvantages: ① The system is complex and the investment is very high; ② It increases the flue gas resistance and the power consumption of the induced draft fan; ③ New spray towers and heat pump rooms are required, which take up a lot of space; ④ It requires steam or electric drive, which has high operating and maintenance costs.)

[0006] 3. Install a shell-and-tube or plate-type heat exchanger on the outlet slurry pipeline of a certain circulating pump to recover the slurry heat (equivalent to recovering the waste heat of desulfurized flue gas) (Disadvantages: ① The circulation pipeline layout needs to be changed, and the circulation pipeline is lengthened and difficult to arrange; ② The circulation pipeline resistance is increased, affecting the operation of the slurry circulation pump. If the original pump head is insufficient, the circulation pump needs to be replaced; ③ The shell-and-tube or plate-type heat exchanger is easy to clog and difficult to repair.)

[0007] Existing waste heat recovery technologies have the problems of large investment, complex system, great impact on the normal operation of existing equipment, difficult layout, and difficult operation and maintenance. Utility Model Content

[0008] In order to solve the above technical problems, the utility model provides a novel desulfurization circulating slurry waste heat recovery device arranged in situ.

[0009] The utility model provides a new type of in-situ arranged desulfurization circulating slurry waste heat recovery device, which includes a desulfurization tower and a desulfurization slurry pool. The desulfurization slurry pool is located in the inner cavity of the desulfurization tower. The inner cavity of the desulfurization tower is respectively provided with a spray pipe and a demister. The desulfurization tower is respectively provided with a flue gas pipe and a heat exchange mechanism, and a support mechanism is provided at the bottom of the heat exchange mechanism.

[0010] In order to recycle and utilize waste heat, the utility model provides a new type of desulfurization circulating slurry waste heat recovery device arranged in situ. Preferably, the heat exchange mechanism includes a liquid outlet pipe, a spiral shell heat exchanger is provided on one side of the liquid outlet pipe, one end of the spiral shell heat exchanger is connected to a circulation pump through a pipeline, and the water outlet of the circulation pump is connected to the spray pipe through a delivery pipe.

[0011] In order to improve the stability of the heat exchange mechanism, the utility model provides a new desulfurization circulating slurry waste heat recovery device arranged in situ. Preferably, the support mechanism includes a support plate, the top of the support plate is rotatably engaged with an adjusting sleeve, the inner cavity of the adjusting sleeve is threadedly connected to an adjusting rod, the top of the adjusting rod is fixedly connected to a mounting plate, and the circulating pump is installed on the top of the mounting plate.

[0012] In order to improve the stability of the mounting plate, the utility model provides a new desulfurization circulating slurry waste heat recovery device arranged in situ. Preferably, the top of the support plate is fixedly connected to an auxiliary tube, the inner cavity of the auxiliary tube is slidably connected to an auxiliary rod, and the top of the auxiliary rod is fixedly connected to the bottom of the mounting plate.

[0013] In order to limit the auxiliary rod, the utility model provides a new desulfurization circulating slurry waste heat recovery device arranged in situ. Preferably, the top of the auxiliary cylinder is fixedly connected to a limiting block, and the top of the limiting block is fixedly connected to a limiting ring.

[0014] In order to fix the support plate, the utility model provides a new desulfurization circulating slurry waste heat recovery device arranged in situ. Preferably, both sides of the support plate are fixedly connected with fixing blocks, and the inner cavity of the fixing block is threadedly connected with a fixing bolt.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] The novel in-situ arranged desulfurization circulating slurry waste heat recovery device sets a spiral shell and tube heat exchanger between the liquid outlet pipe and the circulation pump. The desulfurization slurry entering the inner tube of the spiral shell and tube heat exchanger gradually heats the cold water entering the outer tube of the spiral shell and tube heat exchanger through the cold water inlet of the outer tube of the spiral shell and tube heat exchanger to hot water, and then is discharged through the outer tube drain port. The cooled desulfurization slurry is transported to the transport pipe through the circulation pump, and then enters the spray pipe again to react with the flue gas, and the cycle is repeated. This device does not require changes to the operation and layout of the original equipment and pipelines. It has a simple overall structure, high equipment reliability, low maintenance workload, and no need for new power. The number of heat exchange mechanisms can be increased or reduced according to the amount of heat to be recovered, which solves the problems of the existing waste heat recovery technology, such as large investment, complex system, great impact on the normal operation of the original equipment, difficulty in layout, and difficulty in operation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic structural diagram of a preferred embodiment of a novel in-situ desulfurization circulating slurry waste heat recovery device provided by the utility model;

[0018] Figure 2 It is a top view of the local structure of the utility model;

[0019] Figure 3 It is a structural diagram of the support mechanism of the utility model.

[0020] Numbers in the figure: 1. Desulfurization tower; 2. Desulfurization slurry pool; 3. Spray pipe; 4. Demister; 5. Flue gas pipe; 6. Heat exchange mechanism; 601. Liquid outlet pipe; 602. Spiral tube heat exchanger; 603. Circulation pump; 604. Delivery pipe; 7. Support mechanism; 701. Support plate; 702. Adjustment sleeve; 703. Adjustment rod; 704. Mounting plate; 8. Auxiliary cylinder; 9. Auxiliary rod; 10. Limit block; 11. Limit ring; 12. Fixing block; 13. Fixing bolt. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings and implementation examples.

[0022] Please refer to Figure 1 、 Figure 2 and Figure 3 ,in Figure 1 A schematic structural diagram of a preferred embodiment of a novel in-situ desulfurization circulating slurry waste heat recovery device provided by the utility model; Figure 2 It is a top view of the local structure of the utility model; Figure 3The figure is a schematic diagram of the structure of the support mechanism of the utility model. A novel desulfurization circulating slurry waste heat recovery device arranged in situ includes a desulfurization tower 1 and a desulfurization slurry pool 2. The desulfurization slurry pool 2 is located in the inner cavity of the desulfurization tower 1. The inner cavity of the desulfurization tower 1 is respectively provided with a spray pipe 3 and a demister 4. The desulfurization tower 1 is respectively provided with a flue gas pipe 5 and a heat exchange mechanism 6. The bottom of the heat exchange mechanism 6 is provided with a support mechanism 7. The heat exchange mechanism 6 includes a liquid outlet pipe 601. A spiral shell heat exchanger 602 is provided on one side of the liquid outlet pipe 601. One end of the spiral shell heat exchanger 602 is connected to a circulation pump 603 through a pipeline. The water outlet of the circulation pump 603 is connected to the spray pipe 3 through a delivery pipe 604.

[0023] In this embodiment: one end of the liquid outlet pipe 601 is connected to the outside of the desulfurization tower 1, the inner tube liquid inlet of the spiral shell heat exchanger 602 is connected to the liquid outlet pipe 601, the inner tube liquid outlet of the spiral shell heat exchanger 602 is connected to the liquid inlet of the circulation pump 603, the flue gas enters the desulfurization tower 1 through the flue gas pipe 5, the circulation pump 603 draws the desulfurization slurry in the desulfurization slurry pool 2 through the liquid outlet pipe 601 to the delivery pipe 604, and then delivers it to the spray pipe 3. The desulfurization slurry sprayed from the spray pipe 3 contacts the flue gas, and then passes through the demister 4 for demisting and is discharged into the chimney. The desulfurization slurry after reacting with the flue gas falls into the desulfurization slurry pool 2 at the bottom of the desulfurization tower 1 for collection. By setting a spiral shell between the liquid outlet pipe 601 and the circulation pump 603 The desulfurized slurry enters the inner tube of the spiral shell heat exchanger 602, and gradually heats the cold water entering the outer tube of the spiral shell heat exchanger 602 through the cold water inlet of the outer tube of the spiral shell heat exchanger 602 to hot water, and then is discharged through the drain outlet of the outer tube. The cooled desulfurized slurry is transported to the delivery pipe 604 through the circulation pump 603, and then enters the spray pipe 3 again to react with the flue gas, and the cycle is repeated. The user can increase or decrease the number of heat exchange mechanisms 6 according to the amount of heat to be recovered. The outer tubes of each spiral shell heat exchanger 602 are connected in series, such as the outer tube water outlet of the first spiral shell heat exchanger 602 is connected to the outer tube water inlet of another spiral shell heat exchanger 602, so as to recover the waste heat.

[0024] As a technical optimization solution of the present invention, the support mechanism 7 includes a support plate 701, the top of the support plate 701 is rotatably fitted with an adjustment sleeve 702, the inner cavity of the adjustment sleeve 702 is threadedly connected to an adjustment rod 703, the top of the adjustment rod 703 is fixedly connected to a mounting plate 704, and the circulating pump 603 is installed on the top of the mounting plate 704;

[0025] The top of the support plate 701 is fixedly connected to an auxiliary tube 8 , the inner cavity of the auxiliary tube 8 is slidably connected to an auxiliary rod 9 , and the top of the auxiliary rod 9 is fixedly connected to the bottom of the mounting plate 704 .

[0026] In this embodiment: after the circulation pump 603 is installed on the top of the mounting plate 704, if the flatness of the ground causes the liquid inlet of the circulation pump 603 to be lower than or higher than the inner tube of the spiral sleeve heat exchanger 602, the user can rotate the adjustment sleeve 702 to make the adjustment rod 703 rise or fall, thereby driving the mounting plate 704 to rise or fall, and adjust the height of the circulation pump 603 to facilitate the communication between the liquid inlet of the circulation pump 603 and the inner tube of the spiral sleeve heat exchanger 602. The auxiliary rod 9 can move with the mounting plate 704. By setting the auxiliary rod 9 in conjunction with the auxiliary tube 8, the mounting plate 704 can be limited, thereby improving the structural stability of the mounting plate 704.

[0027] As a technical optimization solution of the present invention, the top of the auxiliary cylinder 8 is fixedly connected to the limiting block 10 , and the top of the limiting block 10 is fixedly connected to the limiting ring 11 .

[0028] In this embodiment, by providing the limiting block 10 and the limiting ring 11 , the auxiliary rod 9 can be limited when the auxiliary rod 9 moves, thereby improving the stability of the auxiliary rod 9 when moving.

[0029] As a technical optimization solution of the present invention, both sides of the support plate 701 are fixedly connected with fixing blocks 12 , and the inner cavity of the fixing block 12 is threadedly connected with a fixing bolt 13 .

[0030] In this embodiment, the support plate 701 can be fixed by twisting the fixing bolt 13 in the fixing block 12 into an external fixing object, thereby improving the stability of the support plate 701 during use.

[0031] The working principle of the novel in-situ desulfurization circulating slurry waste heat recovery device provided by the utility model is as follows:

[0032] The flue gas enters the desulfurization tower 1 through the flue gas pipe 5, and the circulating pump 603 draws the desulfurization slurry in the desulfurization slurry pool 2 through the liquid outlet pipe 601 to the delivery pipe 604, and then delivers it to the spray pipe 3. The desulfurization slurry sprayed from the spray pipe 3 contacts the flue gas, and then passes through the demister 4 for demisting and is discharged into the chimney. The desulfurization slurry after reacting with the flue gas falls into the desulfurization slurry pool 2 at the bottom of the desulfurization tower 1 for collection. By arranging a spiral shell heat exchanger 602 between the liquid outlet pipe 601 and the circulating pump 603, the desulfurization slurry entering the inner tube of the spiral shell heat exchanger 602 gradually heats the cold water entering the outer tube of the spiral shell heat exchanger 602 through the cold water inlet of the outer tube of the spiral shell heat exchanger 602 to hot water, and then discharges it through the outer tube drain port. The desulfurized slurry after cooling is transported to the delivery pipe 604 through the circulation pump 603, and then enters the spray pipe 3 again to react with the flue gas, and the cycle is repeated. The user can increase or decrease the number of heat exchange mechanisms 6 according to the amount of heat to be recovered. The outer pipes of each spiral shell heat exchanger 602 are connected in series. For example, the outer pipe water outlet of the first spiral shell heat exchanger 602 is connected to the outer pipe water inlet of another spiral shell heat exchanger 602 to facilitate waste heat recovery. This device does not require changes to the operation and layout of the original equipment and pipelines. It has a simple overall structure, high equipment reliability, low maintenance workload, and no need for additional power. The number of heat exchange mechanisms 6 can also be increased or decreased according to the amount of heat to be recovered.

[0033] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A new type of in-situ desulfurization circulating slurry waste heat recovery device, characterized in that: The invention comprises a desulfurization tower (1) and a desulfurization slurry pool (2), wherein the desulfurization slurry pool (2) is located in the inner cavity of the desulfurization tower (1), the inner cavity of the desulfurization tower (1) is respectively provided with a spray pipe (3) and a demister (4), the desulfurization tower (1) is respectively provided with a flue gas pipe (5) and a heat exchange mechanism (6), the bottom of the heat exchange mechanism (6) is provided with a support mechanism (7), the heat exchange mechanism (6) comprises a liquid outlet pipe (601), a spiral shell and tube heat exchanger (602) is provided on one side of the liquid outlet pipe (601), one end of the spiral shell and tube heat exchanger (602) is connected to a circulation pump (603) through a pipeline, and the water outlet of the circulation pump (603) is connected to the spray pipe (3) through a delivery pipe (604).

2. The novel in-situ desulfurization circulating slurry waste heat recovery device according to claim 1 is characterized in that: The support mechanism (7) comprises a support plate (701), the top of the support plate (701) is rotatably engaged with an adjustment sleeve (702), the inner cavity of the adjustment sleeve (702) is threadedly connected to an adjustment rod (703), the top of the adjustment rod (703) is fixedly connected to a mounting plate (704), and the circulating pump (603) is installed on the top of the mounting plate (704).

3. The novel in-situ desulfurization circulating slurry waste heat recovery device according to claim 2 is characterized in that: The top of the support plate (701) is fixedly connected to an auxiliary cylinder (8), the inner cavity of the auxiliary cylinder (8) is slidably connected to an auxiliary rod (9), and the top of the auxiliary rod (9) is fixedly connected to the bottom of the mounting plate (704).

4. The novel in-situ desulfurization circulating slurry waste heat recovery device according to claim 3 is characterized in that: The top of the auxiliary cylinder (8) is fixedly connected to a limiting block (10), and the top of the limiting block (10) is fixedly connected to a limiting ring (11).

5. The novel in-situ desulfurization circulating slurry waste heat recovery device according to claim 2 is characterized in that: Both sides of the support plate (701) are fixedly connected with fixing blocks (12), and the inner cavity of the fixing block (12) is threadedly connected with a fixing bolt (13).

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