Desulfurization wastewater drying tower

Abstract

The utility model discloses a desulfurization wastewater drying tower, which belongs to the field of wastewater treatment and comprises an inner cylinder and an outer cylinder, a hot air inlet is arranged on one side of the lower portion of the inner cylinder, an ash hopper is arranged on the lower portion of the inner cylinder, an ash discharging valve is arranged on the lower portion of the ash hopper, the lower portion of the inner cylinder is communicated with the outer cylinder through a plurality of circulation pipes, and a communication pipe is arranged on the lower portion of the hot air inlet. An exhaust pipe is arranged on the upper portion of the outer cylinder, a rainproof cap is arranged on the upper portion of the exhaust pipe, a preheating box is arranged on the lower portion of the outer cylinder, and a waste water inlet pipe is arranged on one side of the preheating box. A water pump is arranged on one side of the outer barrel, a water suction pipe of the water pump extends into the preheating box, a water outlet pipe of the water pump is connected with a coil pipe, the coil pipe is arranged in the inner barrel, and a plurality of atomizing nozzles are arranged on the lower portion of the coil pipe. Waste heat of the inner cylinder of the drying tower is used for preheating waste water in the preheating box, the spraying temperature of the desulfurization waste water is increased, the drying efficiency of the desulfurization waste water is improved, the utilization rate of flue gas heat is improved, and the energy consumption of system operation is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of wastewater treatment, in particular to a desulfurization wastewater drying tower. Background Art

[0002] With the increasing awareness of environmental protection and the continuous improvement of emission standards, the treatment of desulfurization wastewater from coal-fired power plants, as one of the main sources of energy consumption and pollutant emissions, has attracted widespread attention. At present, domestic coal-fired power plants mainly use wet desulfurization technology, which improves the efficiency of flue gas desulfurization while also generating a large amount of desulfurization wastewater. These wastewaters have become one of the most difficult wastewaters to treat in coal-fired power plants due to their large fluctuations in water quality, high TDS (total dissolved solids), high chloride ion concentration, and high calcium and magnesium hardness.

[0003] Wet desulfurization technology has been widely used in flue gas desulfurization of large coal-fired power plants due to its advantages such as fast reaction speed, high efficiency and high utilization rate of desulfurization additives. However, this technology will produce a certain amount of wastewater during use. If this wastewater is directly discharged without effective treatment, it will cause serious pollution to the environment. Therefore, how to efficiently and economically treat desulfurization wastewater has become an urgent problem to be solved in coal-fired power plants.

[0004] As one of the important equipment for desulfurization wastewater treatment, the drying tower works by spraying wastewater into the drying tower and introducing high-temperature gas into the drying tower, so that the water mist dries and solidifies under the evaporation of the high-temperature gas. However, the existing desulfurization wastewater drying tower has the following problems in practical application: the temperature of the wastewater is low when it is introduced into the drying tower, and the gas temperature required for evaporation is high, resulting in a large consumption of system heat energy and increased operating costs. Utility Model Content

[0005] The utility model aims to overcome the deficiencies in the prior art and provide a desulfurization wastewater drying tower to solve the problems of large heat energy consumption and high operating cost of the current desulfurization wastewater drying tower.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A desulfurization wastewater drying tower comprises an inner tube and an outer tube, wherein the upper opening of the inner tube is closed, a hot gas inlet is arranged on one side of the lower part of the inner tube, an ash hopper is arranged on the lower part of the inner tube, an ash discharge valve is arranged on the lower part of the ash hopper, the outer tube is sleeved on the outside of the inner tube, the lower part of the inner tube is connected with the outer tube through a plurality of flow pipes, and the connecting pipe is located at the lower part of the hot gas inlet, an exhaust pipe is arranged on the upper part of the outer tube, a rainproof cap is arranged on the upper part of the exhaust pipe, a preheating box is arranged on the lower part of the outer tube, a support leg is arranged on the lower part of the preheating box, and a wastewater inlet pipe is arranged on one side of the preheating box; a water pump is arranged on one side of the outer tube, a water suction pipe of the water pump extends into the interior of the preheating box, a water outlet pipe of the water pump is connected with a coil, the coil is arranged inside the inner tube, and a plurality of atomizing nozzles are arranged on the lower part of the coil.

[0008] Furthermore, the hot gas inlet is arranged tangentially to the inner cylinder.

[0009] Furthermore, a demister is provided inside the circulation pipe.

[0010] Furthermore, the demister includes a first demister plate and a second demister plate, and the first demister plate and the second demister plate are arranged alternately front and back.

[0011] Furthermore, a fixing plate is fixedly connected inside the exhaust pipe, a plurality of mounting holes are provided on the fixing plate, and filter bags are installed in the mounting holes.

[0012] Furthermore, the ash unloading valve includes a motor installed at the bottom of the ash hopper, the end of the output shaft of the motor is connected to a rotating shaft, the upper part of the ash hopper is fixedly connected to a fixing frame, the upper end of the rotating shaft is rotatably connected to the fixing frame, the rotating shaft is provided with spiral blades, and an ash discharge pipe is provided on one side of the ash hopper.

[0013] Furthermore, a plurality of connecting rods are fixedly connected to the outside of the rotating shaft, and a scraper is fixedly connected to the other end of the connecting rod, and one side of the scraper is against the inner wall of the ash hopper.

[0014] Furthermore, the scraper is arranged obliquely or spirally on the inner wall of the ash hopper.

[0015] Furthermore, a fixing seat is provided on the ash outlet pipe, screws are fixedly connected on both sides of the fixing seat, a sealing plate is provided at the end of the ash outlet pipe, through holes are provided on both sides of the sealing plate, the screw passes through the through holes of the sealing plate and is sleeved with a spring, and one end of the screw is threadedly connected with a fastening nut.

[0016] The beneficial effects of the utility model are:

[0017] 1) The utility model utilizes the waste heat of the inner tube of the drying tower to preheat the wastewater in the preheating box, thereby increasing the spraying temperature of the desulfurized wastewater, increasing the drying efficiency of the desulfurized wastewater, increasing the utilization rate of the flue gas heat, and reducing the energy consumption of the system operation.

[0018] 2) A first demister plate and a second demister plate are arranged in a staggered manner in the circulation pipe to capture the water mist entrained in the hot air, thereby preventing the unevaporated water vapor from being discharged with the hot air.

[0019] 3) A dust filter bag is installed in the upper exhaust pipe to capture solid particles carried in the flue gas for a second time, further enhancing the effect of desulfurization wastewater treatment.

[0020] 4) A spiral blade is installed in the ash hopper to ensure the smooth discharge of solid particles. At the same time, a scraper is installed in the ash hopper to scrape the inner wall of the ash hopper to avoid the solid particles from compacting at the bottom of the ash hopper.

[0021] 5) A fixed seat and a sealing plate are set at the end of the ash discharge pipe, and the fixed seat and the sealing plate are connected by a spring. When discharging ash, the ash material squeezes the sealing plate to open the ash outlet. After the ash discharge is completed, the sealing plate automatically seals the ash discharge pipe under the action of the spring, thereby preventing hot air from leaking from the ash discharge pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Attached Figure 1 The utility model is a schematic diagram of the structure of a desulfurization wastewater drying tower.

[0023] Attached Figure 2 The utility model is a schematic diagram of the interior of a desulfurization wastewater drying tower.

[0024] Attached Figure 3 The utility model is a cross-sectional view of an ash hopper in a desulfurization wastewater drying tower.

[0025] Attached Figure 4 The utility model is a schematic diagram of the interior of a flow pipe in a desulfurization wastewater drying tower.

[0026] In the figure, 1, outer cylinder; 2, inner cylinder; 3, preheating box; 4, wastewater inlet pipe; 5, supporting leg; 6, hot air inlet; 7, exhaust pipe; 8, ash hopper; 9, water pump; 10, water suction pipe; 11, water outlet pipe; 12, coil; 13, atomizing nozzle; 14, rain cap; 15, circulation pipe; 16, demister; 161, first demister plate; 162, second demister plate; 17, fixing plate; 18, filter bag; 19, motor; 20, rotating shaft; 21, spiral blade; 22, fixing frame; 23, scraper; 24, connecting rod; 25, ash outlet pipe; 26, fixing seat; 27, blocking plate; 28, screw; 29, spring. DETAILED DESCRIPTION

[0027] The following will be combined with the attached Figure 1-Figure 4, clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0029] like Figure 1 , Figure 2 As shown, a desulfurization wastewater drying tower includes an inner tube 2 and an outer tube 1, wherein the upper opening of the inner tube 2 is closed, a hot gas inlet is arranged on one side of the lower part of the inner tube 2, an ash hopper 8 is arranged at the lower part of the inner tube 2, and an ash discharge valve is arranged at the lower part of the ash hopper 8, the outer tube 1 is sleeved on the outside of the inner tube 2, the lower part of the inner tube 2 is connected with the outer tube 1 through a plurality of flow pipes 15, and the connecting pipes are located at the lower part of the hot gas inlet, an exhaust pipe 7 is arranged at the upper part of the outer tube 1, a rainproof cap 14 is arranged at the upper part of the exhaust pipe 7, a preheating box 3 is arranged at the lower part of the outer tube 1, and a preheating box 3 is arranged at the lower part of the outer tube 1. A support leg 5 is provided at the lower part of the box 3, and a wastewater inlet pipe 4 is provided at one side of the preheating box 3. The desulfurized wastewater enters the preheating box 3 through the wastewater inlet pipe 4, and the desulfurized wastewater is preheated by utilizing the waste heat of the flue gas, thereby improving the utilization rate of thermal energy and reducing the energy consumption and operation cost of the equipment; a water pump 9 is provided at one side of the outer tube 1, and a water suction pipe 10 of the water pump 9 extends into the preheating box 3, and a water outlet pipe 11 of the water pump 9 is connected to a coil 12, and the coil 12 is arranged inside the inner tube 2, and a plurality of atomizing nozzles 13 are provided at the lower part of the coil 12.

[0030] like Figure 2 As shown, the hot gas inlet is arranged tangentially to the inner tube 2, which ensures the uniformity of the hot gas distribution in the inner tube 2, thereby ensuring the drying effect of the desulfurization wastewater.

[0031] like Figure 4 As shown, a demister 16 is provided inside the flow pipe 15, and the demister 16 captures the water mist carried in the hot gas, thereby ensuring the effect of desulfurization wastewater treatment.

[0032] like Figure 4 As shown, the demister 16 includes a first demister plate 161 and a second demister plate 162 , and the first demister plate 161 and the second demister plate 162 are arranged alternately front to back, thereby enhancing the demister effect of the demister 16 .

[0033] like Figure 2 As shown, a fixing plate 17 is fixedly connected inside the exhaust pipe 7, and a plurality of mounting holes are provided on the fixing plate 17. Filter bags 18 are installed in the mounting holes. The filter bags 18 perform secondary capture of solid particles carried in the flue gas, thereby further enhancing the effect of desulfurization wastewater treatment.

[0034] like Figure 3 As shown, the ash unloading valve includes a motor 19 installed at the lower part of the ash hopper 8, the end of the output shaft of the motor 19 is connected to a rotating shaft 20, the upper part of the ash hopper 8 is fixedly connected to a fixing frame 22, the upper end of the rotating shaft 20 is rotatably connected to the fixing frame 22, the rotating shaft 20 is provided with a spiral blade 21, and one side of the ash hopper 8 is provided with an ash outlet pipe 25; when unloading ash, the motor 19 drives the rotating shaft 20 and the spiral blade 21 to rotate, and the solid particles in the ash hopper 8 are discharged from the ash outlet pipe 25, thereby preventing the solid particles from being compacted at the bottom of the ash hopper 8.

[0035] like Figure 3 As shown, the rotating shaft 20 is fixedly connected to a plurality of connecting rods 24 on the outside, and a scraper 23 is fixedly connected to the other end of the connecting rod 24. One side of the scraper 23 is in contact with the inner wall of the ash hopper 8. When the rotating shaft 20 rotates, the scraper 23 is driven to rotate through the connecting rod 24 to scrape off the solid particles compacted on the inner wall of the ash hopper 8, thereby preventing the solid particles from compacting on the inner wall of the ash hopper 8.

[0036] like Figure 3 As shown, the scraper 23 is arranged obliquely or spirally on the inner wall of the ash hopper 8, which ensures the scraping effect of the scraper 23.

[0037] like Figure 3 As shown, a fixing seat 26 is provided on the ash discharge pipe 25, and screws 28 are fixedly connected on both sides of the fixing seat 26. A sealing plate 27 is provided at the end of the ash discharge pipe 25, and through holes are provided on both sides of the sealing plate 27. The screw 28 passes through the through holes of the sealing plate 27 and is sleeved with a spring 29, and one end of the screw 28 is threadedly connected with a fastening nut; during ash discharge, when the solid particles in the ash discharge pipe 25 accumulate to a certain extent, the sealing plate 27 is squeezed outward to expose the end of the ash discharge pipe 25, and the solid particles are discharged from the end of the ash discharge pipe 25. When the ash discharge stops, the sealing plate 27 automatically blocks the ash discharge pipe 25 under the action of the spring 29, thereby preventing hot air from leaking from the ash discharge pipe 25.

[0038] When the desulfurized wastewater is dried, the wastewater is first pumped into the preheating box 3, and the water pump 9 transports the desulfurized wastewater in the preheating box 3 to the atomizing nozzle 13, so that the wastewater is sprayed out in the form of water mist; at the same time, the high-temperature gas enters the inner cylinder 2 from the hot gas inlet 6, evaporates and dries the desulfurized wastewater in the form of water mist, and the solid particles in the dried wastewater fall into the ash hopper 8, and the waste gas enters the outer cylinder 1 through the flow pipe 15 at the bottom of the inner cylinder 2. During the flow of the waste gas, the water vapor carried by it is captured by the demister 16, and the solid particles carried in the waste gas are captured again by the filter bag 18, and the purified flue gas is discharged through the exhaust pipe 7. When the desulfurized wastewater is dried in the inner cylinder 2, the preheating of the inner cylinder 2 preheats the desulfurized wastewater in the preheating box 3, thereby increasing the spraying temperature of the desulfurized wastewater, increasing the drying efficiency of the desulfurized wastewater, increasing the utilization rate of the flue gas heat, and reducing the energy consumption of the system operation.

[0039] The above contents are merely examples and explanations of the structure of the utility model. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of the utility model.

Claims

1. A desulfurization wastewater drying tower, comprising an inner cylinder and an outer cylinder, characterized in that: The upper opening of the inner cylinder is closed, a hot air inlet is provided on one side of the lower part of the inner cylinder, an ash hopper is provided at the lower part of the inner cylinder, an ash discharge valve is provided at the lower part of the ash hopper, the outer cylinder is sleeved on the outside of the inner cylinder, the lower part of the inner cylinder is connected with the outer cylinder through a plurality of flow pipes, and the connecting pipe is located at the lower part of the hot air inlet, an exhaust pipe is provided at the upper part of the outer cylinder, a rainproof cap is provided at the upper part of the exhaust pipe, a preheating box is provided at the lower part of the outer cylinder, a support leg is provided at the lower part of the preheating box, and a wastewater inlet pipe is provided at one side of the preheating box; a water pump is provided at one side of the outer cylinder, a water suction pipe of the water pump extends into the interior of the preheating box, a water outlet pipe of the water pump is connected with a coil, the coil is arranged inside the inner cylinder, and a plurality of atomizing nozzles are provided at the lower part of the coil.

2. A desulfurization wastewater drying tower according to claim 1, characterized in that: The hot gas inlet is arranged tangentially to the inner cylinder.

3. A desulfurization wastewater drying tower according to claim 1, characterized in that: A demister is arranged inside the circulation pipe.

4. A desulfurization wastewater drying tower according to claim 3, characterized in that: The demister comprises a first demister plate and a second demister plate, and the first demister plate and the second demister plate are arranged alternately front and back.

5. A desulfurization wastewater drying tower according to claim 1, characterized in that: A fixing plate is fixedly connected inside the exhaust pipe, and a plurality of mounting holes are arranged on the fixing plate, in which filter bags are installed.

6. A desulfurization wastewater drying tower according to any one of claims 1 to 5, characterized in that: The ash discharge valve includes a motor installed at the bottom of the ash hopper, the end of the motor's output shaft is connected to a rotating shaft, the upper part of the ash hopper is fixedly connected to a fixing frame, the upper end of the rotating shaft is rotatably connected to the fixing frame, the rotating shaft is provided with spiral blades, and one side of the ash hopper is provided with an ash discharge pipe.

7. A desulfurization wastewater drying tower according to claim 6, characterized in that: A plurality of connecting rods are fixedly connected to the outside of the rotating shaft, and a scraper is fixedly connected to the other end of the connecting rod, and one side of the scraper is against the inner wall of the ash hopper.

8. A desulfurization wastewater drying tower according to claim 7, characterized in that: The scraper is arranged obliquely or spirally on the inner wall of the ash hopper.

9. A desulfurization wastewater drying tower according to claim 6, characterized in that: The ash outlet pipe is provided with a fixing seat, and screws are fixedly connected on both sides of the fixing seat. A sealing plate is provided at the end of the ash outlet pipe, and through holes are provided on both sides of the sealing plate. The screw passes through the through holes of the sealing plate and is sleeved with a spring. One end of the screw is threadedly connected with a fastening nut.

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