Recycling system and method for waste water of coke powder sedimentation tank

Abstract

The invention belongs to the field of dry quenching production equipment, and particularly relates to a coke powder sedimentation tank wastewater recycling system and method.The coke powder sedimentation tank wastewater recycling system comprises a coke powder sedimentation tank, a first-stage filter tank, a second-stage filter tank, a third-stage filter tank and a coke powder sedimentation tank, the coke powder sedimentation tank is arranged in the coke powder sedimentation tank and communicated with the first-stage filter tank, and the second-stage filter tank is communicated with the third-stage filter tank; the first-stage filter tank is sequentially communicated with the second-stage filter tank and the third-stage filter tank, and filter screens are arranged at inlets of the first-stage filter tank, the second-stage filter tank and the third-stage filter tank; the coke powder settling tank is hinged with the coke powder settling pond, and a support frame is fixed at the bottom of the coke powder settling pond and is used for supporting the coke powder settling tank. The coke powder cleaning device has the advantages of effectively cleaning coke powder and reducing labor intensity. The three-stage filtering system and the coke powder sedimentation tank are adopted, and the coke powder sedimentation tank is separated from the three-stage filtering system, so that the filtering efficiency is improved, and the service life of conveying equipment such as a booster pump is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of dry quenching coke production equipment, and in particular relates to a wastewater recycling system and method for a coke powder sedimentation tank. Background Art

[0002] The furnace cover at the dry quenching furnace mouth cooperates with the water seal groove to seal the circulating flue gas in the dry quenching furnace. The water seal groove is equipped with a water supply pipe, an overflow groove and a drain valve. Water is continuously supplied through the water supply pipe, and the excess water is discharged from the overflow groove. The coke pushed out of the coke oven is loaded into the dry quenching furnace, and the furnace cover is opened. After the coke loading is completed, the furnace cover is buckled into the water seal groove again. In this process, most of the coke powder enters the water seal groove, and when the furnace cover is closed, due to the effect of thermal buoyancy in the dry quenching furnace, some dust will also enter the water seal groove. Figure 1 The coke powder in the water seal tank is discharged with water into the coke powder sedimentation tank for sedimentation. After the coke powder is precipitated, when using a coke powder shovel to clean it, the mixed sewage affects the amount of coke powder that can be fished out, and it is more difficult to fish out at the bottom and cannot be handled cleanly. When the coke powder deposition is high, the coke powder at the bottom is dense and difficult to clean with a coke powder shovel. In addition, the coke powder shovel itself is heavy, and it is very clumsy with the weight of the coke powder, which increases the labor intensity. The wastewater cannot be used and is directly discharged into the sewage pool. There are also work areas that send wastewater back to the water seal tank through a pressure pump, but the pressure pump often gets stuck and damaged. The main reason is that the filtration in the coke powder sedimentation tank does not meet the use requirements. Summary of the invention

[0003] The purpose of the present invention is to provide a wastewater recycling system and method for a coke powder sedimentation tank, so as to improve the coke powder cleaning efficiency in the sedimentation tank and solve the problem that wastewater cannot be reused.

[0004] To achieve the above object, the present invention is implemented through the following technical solutions:

[0005] A coke powder sedimentation tank wastewater recycling system comprises a coke powder sedimentation tank, a primary filter tank, a secondary filter tank, a tertiary filter tank and a coke powder sedimentation tank. The coke powder sedimentation tank is provided with a coke powder sedimentation tank, the coke powder sedimentation tank is connected with the primary filter tank, the primary filter tank is connected with the secondary filter tank and the tertiary filter tank in sequence, and filter screens are provided at the entrances of the primary filter tank, the secondary filter tank and the tertiary filter tank; the coke powder sedimentation tank is hinged with the coke powder sedimentation tank, and a support frame is fixed at the bottom of the coke powder sedimentation tank for supporting the coke powder sedimentation tank.

[0006] Inclined plates are fixed in the primary filtering pool, the secondary filtering pool and the tertiary filtering pool.

[0007] The first-stage filter pool, the second-stage filter pool and the third-stage filter pool are all fixed with water baffles, the top of the water baffles is higher than the liquid surface, and a filter net is fixedly connected between the water baffles and the pool wall.

[0008] The coke powder precipitation tank is connected with a drainage port, and a guide plate is fixed in the coke powder precipitation tank, and the drainage port and the guide plate are arranged opposite to each other.

[0009] The coke powder precipitation tank is fixed with a lifting lug away from the hinged position.

[0010] The bottoms of the coke powder sedimentation tank, the primary filter tank, the secondary filter tank and the tertiary filter tank are all connected with mud discharge valves.

[0011] A water level sensor is arranged in the three-stage filtering pool.

[0012] The upper part of the three-stage filtering pool is connected with a water supply pipe and a water outlet pipe.

[0013] The primary filtering pool, the secondary filtering pool and the tertiary filtering pool are provided with flip covers.

[0014] A method for recycling wastewater from a coke powder sedimentation tank comprises the following steps:

[0015] 1) The coke powder in the water seal tank is discharged with water and enters the coke powder sedimentation tank in the coke powder sedimentation tank for sedimentation. The water in the upper part of the coke powder sedimentation tank passes through the drain port and the guide plate, enters the coke powder sedimentation tank from the bottom of the guide plate, and then is discharged from the top of the coke powder sedimentation tank into the primary filtration tank. In this process, a small amount of coke powder accumulates at the bottom of the coke powder sedimentation tank;

[0016] 2) Under the action of the water retaining plate, the water entering the primary filter pool passes through the filter screen and then enters the lower part of the primary filter pool from the bottom of the water retaining plate. The water flow impacts the inclined plate in the primary filter pool and changes direction, suppressing the coke powder from floating up and causing the coke powder to settle to the bottom of the primary filter pool. The water flow then enters the secondary filter pool from the top of the primary filter pool, and then enters the tertiary filter pool. The water flow direction in the secondary and tertiary filter pools is the same as that in the primary filter pool, and finally the water flow is sent out from the outlet pipe;

[0017] 3) When it is necessary to discharge coke powder, open the mud discharge valve of the coke powder sedimentation tank to drain most of the water, lift the coke powder sedimentation tank with an electric hoist, turn the coke powder sedimentation tank outward to the discharge ramp, and let the coke powder fall into the hand trailer for transportation;

[0018] In this process, the sludge and water discharged through the mud discharge valve are discharged into the water bucket for sedimentation, and the water is recycled to the coke powder sedimentation tank, and the precipitated coke powder is sent to the wheelbarrow for transportation.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention can effectively clean coke powder and reduce labor intensity. A three-stage filtration system and a coke powder sedimentation tank are used to separate the coke powder sedimentation tank from the three-stage filtration system, thereby improving filtration efficiency and extending the service life of conveying equipment such as booster pumps. A reversible coke powder sedimentation tank is used to improve the work efficiency of unloading coke powder, and the coke powder can be directly turned outward and dumped, which greatly saves labor. In addition, the coke powder sedimentation tank can be flipped by an electric hoist during the coke powder discharge process, which saves time and labor and can effectively empty the coke powder. The wastewater is filtered at multiple stages to meet the recycling standards, and can be returned to the water seal tank for reuse, which improves water quality while ensuring the normal operation of the booster pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of the original coke powder processing system.

[0022] Figure 2 It is a structural schematic diagram of the present invention.

[0023] Figure 3 This is the layout diagram of the coke powder sedimentation tank and the filtration tank.

[0024] In the figure: 1-coke powder sedimentation tank 2-primary filter tank 3-secondary filter tank 4-tertiary filter tank 5-coke powder sedimentation tank 6-support frame 7-filter screen 8-water baffle 9-inclined plate 10-drain port 11-guide plate 12-mud discharge valve 13-water supply pipe 14-water outlet pipe 15-electric hoist 16-limit rod. DETAILED DESCRIPTION

[0025] The present invention is described in detail below in conjunction with the accompanying drawings, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0026] See Figure 2 A coke powder sedimentation tank wastewater recycling system comprises a coke powder sedimentation tank 1, a primary filter tank 2, a secondary filter tank 3, a tertiary filter tank 4 and a coke powder sedimentation tank 5. The coke powder sedimentation tank 1 is provided with a coke powder sedimentation tank 5, the coke powder sedimentation tank 1 is connected with the primary filter tank 2, the primary filter tank 2 is connected with the secondary filter tank 3 and the tertiary filter tank 4 in turn, and a filter screen 7 is provided at the entrance of the primary filter tank 2, the secondary filter tank 3 and the tertiary filter tank 4, and the filter screen 7 of each stage is periodically inspected and replaced; the coke powder sedimentation tank 5 is hinged to the coke powder sedimentation tank 1, and a support frame 6 is fixed at the bottom of the coke powder sedimentation tank 1 for supporting the coke powder sedimentation tank 5.

[0027] A water baffle 8 is fixed in the primary filter pool 2, the secondary filter pool 3, and the tertiary filter pool 4. The top of the water baffle 8 is higher than the liquid surface, and a filter screen 7 is fixedly connected between the water baffle 8 and the pool wall. An inclined plate 9 is fixed in the primary filter pool 2, the secondary filter pool 3, and the tertiary filter pool 4. The middle part corresponds to the lower part of the water baffle 8. The water flow entering from the lower part of the water baffle 8 impacts the inclined plate 9 to change direction, so as to control the direction of the water flow, effectively inhibit the coke powder from floating, and ensure the water quality entering the next filter pool 2.

[0028] The bottom of the coke powder sedimentation tank 1, the primary filter tank 2, the secondary filter tank 3, and the tertiary filter tank 4 are all connected with a mud discharge valve 12, which can regularly discharge the deposited smaller coke powder particles. The coke powder sedimentation tank 5 is connected with a drain port 10, and a guide plate 11 is fixed in the coke powder sedimentation tank 1. The drain port 10 and the guide plate 11 are arranged opposite to each other to guide the water flow from bottom to top, extend the travel in the coke powder sedimentation tank 1, and leave the coke powder sedimentation time, so that the coke powder can fall to the bottom of the coke powder sedimentation tank 1 as much as possible, and then be discharged regularly through the mud discharge valve 12. The coke powder sedimentation tank 5 is fixed with a lifting lug away from the hinged position. A limit rod 16 is set at the extreme position of the coke powder sedimentation tank 5 (the limit rod 16 can be fixed on a bracket fixed to the ground foundation) to prevent the coke powder sedimentation tank 5 from over-turning.

[0029] See Figure 2 , Figure 3 There can be two coke powder sedimentation tanks 5 in the wastewater recycling system of the coke powder sedimentation tank. When in use, if the amount of coke powder in the No. 1 coke powder sedimentation tank 5 exceeds 2 / 3 of the volume, the sewage hose can be switched to the No. 2 coke powder sedimentation tank 5. Open the mud discharge valve 12 of the No. 1 coke powder sedimentation tank 5 to drain most of the water, and the electric hoist 15 is hung on the lifting ear of the No. 1 tank to turn it outward to the unloading ramp, and the coke powder falls into the hand trailer for external transportation. Silt removal can be carried out simultaneously with the cleaning cycle of the coke powder sedimentation tank 5. After the sludge and water are discharged into the bucket for sedimentation, the water is poured back into the sedimentation tank, and the coke powder is poured into the hand trailer.

[0030] A water level sensor is provided in the tertiary filter tank 4, and a water supply pipe 13 and a water outlet pipe 14 are connected to the upper part. The water supply replenishment amount is adjusted according to the liquid level of the tertiary filter tank 4. The water supply pipe 13 and the water outlet pipe 14 are combined on the outside to form an insulation layer. The temperature of the water outlet pipe 14 is as high as about 40°. After the combined insulation, the water supply pipe 13 can be heated to avoid freezing and blockage of the pipeline in winter. The height difference of the water outlet pipe 14 is set to >+2m, and the length to the boiler booster pump is about 25m. The large height difference will smoothly send the outlet water to the booster pump inlet to complete the pumping. The first-stage filter tank 2, the second-stage filter tank 3, and the third-stage filter tank 4 are all provided with lightweight flaps, which can be flipped toward the wall to prevent the on-site coke powder from falling into the filter tank.

[0031] A method for recycling wastewater from a coke powder sedimentation tank comprises the following steps:

[0032] 1) The coke powder in the water seal tank is discharged along with the water into the coke powder sedimentation tank 5 in the coke powder sedimentation tank 1 for sedimentation. The water in the upper part of the coke powder sedimentation tank 5 passes through the drain port 10 and the guide plate 11, enters the coke powder sedimentation tank 1 from the bottom of the guide plate 11, and is then discharged from the top of the coke powder sedimentation tank 1 into the primary filter tank 2. In this process, a small amount of coke powder accumulates at the bottom of the coke powder sedimentation tank 1.

[0033] 2) Under the action of the water retaining plate 8, the water entering the primary filter tank 2 is filtered by the filter screen 7 and then enters the lower part of the primary filter tank 2 from below the water retaining plate 8. The water impacts the inclined plate 9 in the primary filter tank 2 and changes direction, suppressing the floating of coke powder and causing the coke powder to settle to the bottom of the primary filter tank 2. The water then enters the secondary filter tank 3 from the top of the primary filter tank 2, and then enters the tertiary filter tank 4. The water flow direction in the secondary filter tank 3 and the tertiary filter tank 4 is the same as that in the primary filter tank 2. Finally, the water is sent out from the outlet pipe 14.

[0034] 3) When it is necessary to discharge coke powder, the mud discharge valve 12 of the coke powder sedimentation tank 5 is opened to drain most of the water, and the electric hoist 15 lifts the coke powder sedimentation tank 5 to turn the coke powder sedimentation tank 5 outward to the discharge ramp, and the coke powder falls into the hand trailer for transportation;

[0035] In this process, the sludge and water discharged through the mud discharge valve 12 are discharged into a water bucket for sedimentation, and the water is recycled to the coke powder sedimentation tank 5, and the precipitated coke powder is sent to a wheelbarrow for transportation.

[0036] If the dual coke powder settling tanks 1 are used, when the coke powder in the No. 1 coke powder settling tank 5 exceeds 2 / 3 of the volume, the sewage hose is switched to the No. 2 coke powder settling tank 5. The mud discharge valve 12 of the No. 1 coke powder settling tank 5 is opened to drain most of the water, and then the coke powder in the No. 1 coke powder settling tank 5 is sent to a hand trailer for transportation.

[0037] The present invention adopts a three-stage filtration system and a coke powder precipitation tank 5, separates the coke powder precipitation tank 1 from the three-stage filtration system, improves the filtration efficiency, and extends the service life of conveying equipment such as booster pumps. The reversible coke powder precipitation tank 5 is adopted to improve the work efficiency of unloading coke powder, and the coke powder can be directly turned outward and dumped, which greatly saves labor. In addition, the coke powder discharge process can use an electric hoist 15 to flip the coke powder precipitation tank 5, which saves time and labor, and can effectively empty the coke powder. After multi-stage filtration, the wastewater meets the recycling standard and can be returned to the water seal tank for repeated use, which improves the water quality while ensuring the normal operation of the booster pump.

[0038] Through the above specific implementation, the technical personnel in the relevant technical field can easily implement the present invention. However, it should be understood that the present invention is not limited to the above specific implementation. On the basis of the disclosed implementation, the technical personnel in the relevant technical field can arbitrarily combine different technical features to achieve different technical solutions. Due to the limited space and to make the specification concise, the various solutions composed of these combinations are not described one by one. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A wastewater recycling system for coke powder sedimentation tank, characterized in that: It includes a coke powder sedimentation tank, a primary filter tank, a secondary filter tank, a tertiary filter tank and a coke powder sedimentation tank. A coke powder sedimentation tank is provided in the coke powder sedimentation tank. The coke powder sedimentation tank is connected with the primary filter tank. The primary filter tank is connected with the secondary filter tank and the tertiary filter tank in sequence. Filter nets are provided at the entrances of the primary filter tank, the secondary filter tank and the tertiary filter tank. The coke powder sedimentation tank is hinged to the coke powder sedimentation tank. A support frame is fixed to the bottom of the coke powder sedimentation tank for supporting the coke powder sedimentation tank.

2. A coke powder sedimentation tank wastewater recycling system according to claim 1, characterized in that: Inclined plates are fixed in the primary filtering pool, the secondary filtering pool and the tertiary filtering pool.

3. A coke powder sedimentation tank wastewater recycling system according to claim 1, characterized in that: The first-stage filter pool, the second-stage filter pool and the third-stage filter pool are all fixed with water baffles, the top of the water baffles is higher than the liquid surface, and a filter net is fixedly connected between the water baffles and the pool wall.

4. A coke powder sedimentation tank wastewater recycling system according to claim 1, characterized in that: The coke powder precipitation tank is connected with a drainage port, and a guide plate is fixed in the coke powder precipitation tank, and the drainage port and the guide plate are arranged opposite to each other.

5. A coke powder sedimentation tank wastewater recycling system according to claim 1, characterized in that: There are two coke powder precipitation tanks, and a lifting lug is fixed on each of the coke powder precipitation tanks away from the hinged position.

6. A coke powder sedimentation tank wastewater recycling system according to claim 1, characterized in that: The bottoms of the coke powder sedimentation tank, the primary filter tank, the secondary filter tank and the tertiary filter tank are all connected with mud discharge valves.

7. A coke powder sedimentation tank wastewater recycling system according to claim 1, characterized in that: A water level sensor is arranged in the three-stage filtering pool.

8. A coke powder sedimentation tank wastewater recycling system according to claim 1, characterized in that: The upper part of the three-stage filtering pool is connected with a water supply pipe and a water outlet pipe.

9. A coke powder sedimentation tank wastewater recycling system according to claim 1, characterized in that: The primary filtering pool, the secondary filtering pool and the tertiary filtering pool are provided with flip covers.

10. A method for recycling wastewater from a coke powder sedimentation tank using the system according to any one of claims 1 to 9, characterized in that: The following steps are involved: 1) The coke powder in the water seal tank is discharged with water and enters the coke powder sedimentation tank in the coke powder sedimentation tank for sedimentation. The water in the upper part of the coke powder sedimentation tank passes through the drain port and the guide plate, enters the coke powder sedimentation tank from the bottom of the guide plate, and then is discharged from the top of the coke powder sedimentation tank into the primary filtration tank. In this process, a small amount of coke powder accumulates at the bottom of the coke powder sedimentation tank; 2) Under the action of the water retaining plate, the water entering the primary filter pool passes through the filter screen and then enters the lower part of the primary filter pool from the bottom of the water retaining plate. The water flow impacts the inclined plate in the primary filter pool and changes direction, suppressing the coke powder from floating up and causing the coke powder to settle to the bottom of the primary filter pool. The water flow then enters the secondary filter pool from the top of the primary filter pool, and then enters the tertiary filter pool. The water flow direction in the secondary and tertiary filter pools is the same as that in the primary filter pool, and finally the water flow is sent out from the outlet pipe; 3) When it is necessary to discharge coke powder, open the mud discharge valve of the coke powder sedimentation tank to drain most of the water, lift the coke powder sedimentation tank with an electric hoist, turn the coke powder sedimentation tank outward to the discharge ramp, and let the coke powder fall into the hand trailer for transportation; In this process, the sludge and water discharged through the mud discharge valve are discharged into the water bucket for sedimentation, and the water is recycled to the coke powder sedimentation tank, and the precipitated coke powder is sent to the wheelbarrow for transportation.

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