Wet coke leachate collection and disposal system
By designing a combination system of coke storage tank, coagulation and sewage treatment tank and sewage treatment unit, and using permeable brick layer and filtering, the problems of incomplete collection of leachate and easy blockage of the device are solved, and the full collection and efficient purification of leachate are achieved.
Patent Information
- Application Number
- CN202422678229.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-04
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-11-04
AI Technical Summary
The collection effect of existing wet coke leachate is poor, some leachate diffuses to pollute the environment, and the collection device is prone to blockage, making subsequent treatment difficult.
A system including a coke storage tank, a coagulation sediment tank and a sewage treatment unit is designed, and a combined filtration of permeable brick layer, a lower filter and an upper filter are used to combine coagulation sediment and sewage treatment to achieve full collection and purification of the leachate.
The complete collection of leachate is achieved, environmental pollution is reduced, filtration effect is improved, the risk of device blockage is reduced, and the difficulty of subsequent processing is simplified.
Smart Images
Figure CN223118177U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of leachate treatment, in particular to a wet coke leachate collection and disposal system. Background Art
[0002] Wet coke quenching is a commonly used coke quenching method in the coking process of coking plants at present. The refined red-hot coke is sprayed with water to cool it to a temperature convenient for transportation and storage. The temperature of the coke is generally between 950 and 1100 °C, and after quenching, the temperature is reduced to below 250 °C. The process is simple and easy to operate. During the coke quenching process, the excess quenching wastewater will be directly discharged, and after a series of treatments, it will be recycled, and finally, a wet coke product containing a certain amount of moisture will be obtained. Before the wet coke is sold, transported or used, it will be placed in a stacked manner. During the stacking process, since the wet coke itself contains more moisture, and it is often contaminated by rainwater to form coke with higher humidity, the moisture in it will continuously seep out to form leachate. The leachate contains pollutants such as coke powder, ammonia nitrogen, phenol, and cyanide. Direct discharge will cause pollution to the surrounding environment. Therefore, it is necessary to collect and treat it before its discharge or recycling.
[0003] At present, although the leachate of wet coke is also collected and disposed of, the collection effect is not good. Often only a part of it can be collected, and there is still a part that will diffuse into the soil or the surrounding environment, resulting in pollution problems in the surrounding environment. Secondly, due to the large amount of impurities in the leachate, on the one hand, it will cause blockage of the collection device, affecting the normal collection of leachate, and on the other hand, the existence of a large amount of impurities will also lead to the complexity of subsequent treatment processes and the increase of treatment difficulty. Therefore, it is objectively necessary to develop a wet coke leachate collection and disposal system with less pollution, good filtration effect and not easy to be blocked. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a wet coke leachate collection and disposal system with less pollution, good filtration effect and not easy to be blocked.
[0005] The purpose of the utility model is realized as follows. It includes a coke storage tank, a coagulation sedimentation tank and a sewage treatment device. A permeable brick layer is arranged at the bottom inside the coke storage tank. A lower filter screen is laid on the upper surface of the permeable brick layer. An upper grid is arranged at intervals above the lower filter screen. An upper filter screen is laid on the upper grid. The pore diameter of the upper filter screen is larger than that of the lower filter screen. A plurality of drainage grooves are arranged at intervals at the bottom of the coke storage tank. A lower grid is arranged at the notch of the drainage groove. One end of the drainage groove is provided with a drain pipe, and the drain pipe is communicated with the inlet of the coagulation sedimentation tank. The outlet of the coagulation sedimentation tank is communicated with the inlet of the sewage treatment device through a pipeline.
[0006] Furthermore, the bottom of the drainage groove is inclined, and the drain pipe is located at the lower end of the drainage groove.
[0007] Further, a plurality of support columns are provided between the upper grille and the lower filter screen.
[0008] Further, upper flushing pipes are respectively and obliquely arranged on the side walls of the coke storage tank above the lower filter screen and the upper filter screen. The lower end of the upper flushing pipe faces the inside of the coke storage tank, and the higher end is communicated with the outlet of the sewage processor through a pipeline. A sewage discharge port is arranged on the side wall of the coke storage tank opposite to the upper flushing pipe.
[0009] Further, transparent observation windows are respectively arranged on the side walls of the coke storage tank above the lower filter screen and the upper filter screen.
[0010] Further, a lower flushing pipe is arranged on the side wall of the coke storage tank opposite to the position of the drain pipe.
[0011] When the utility model is in use, the wet coke after coke quenching treatment is sent to the coke storage tank and stacked on the upper grille. Water continuously seeps out from the wet coke, and the water drips downward through the filter holes of the upper filter screen. At this time, the water carries a lot of impurities such as fine coke powder particles. The lower filter screen filters the water again to filter out the impurities with smaller particles in the water. Subsequently, the water continues to fall to the permeable brick layer, and the impurities in the water are separated again. The relatively pure water falls into the drainage tank and then is sent to the coagulation sedimentation tank and the sewage processor through the drain pipe in sequence for subsequent sewage treatment. The coagulation sedimentation tank adds a coagulant to make the suspended substances, colloid substances and soluble substances in the water gather together to form large particle flocs and perform sedimentation separation. The sewage processor is used to further purify the water. The utility model is provided with a coke storage tank for storing wet coke. The leachate seeping out from the wet coke can be completely collected, and the collection effect is good. There will be no problem that the leachate diffuses into the soil or the surrounding environment, and the pollution to the surrounding environment is small. Secondly, while collecting the leachate, the utility model also uses the upper filter screen, the lower filter screen and the permeable brick layer to filter the leachate in sequence to remove the particulate impurities such as coke powder in the leachate in sequence. The filtering effect is good, and relatively pure water can be obtained, reducing the treatment process and treatment difficulty of the subsequent treatment process. At the same time, various coke powder particle impurities in the leachate are filtered, and the whole collection device is not easy to be blocked, so that the collection of the leachate can operate normally for a long time. To sum up, the utility model has the advantages of small pollution, good filtering effect and not easy to be blocked. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 is a schematic diagram of the overall structure of the utility model;
[0013] Figure 2 is Figure 1 the sectional structure schematic diagram of A-A in
[0014] In the figure: 1 - coke storage tank, 2 - coagulation sedimentation tank, 3 - sewage treatment device, 4 - permeable brick layer, 5 - lower filter screen, 6 - upper grille, 7 - upper filter screen, 8 - drainage trough, 9 - lower grille, 10 - drain pipe, 11 - support column, 12 - upper flushing pipe, 13 - sewage discharge port, 14 - observation window, 15 - lower flushing pipe. Detailed implementation manner
[0015] The present invention will be further described below in conjunction with the accompanying drawings, but the present invention is not limited in any way. Any changes or improvements made based on the present invention fall within the protection scope of the present invention.
[0016] As Figures 1-2 shown, the present invention includes a coke storage tank 1, a coagulation sedimentation tank 2 and a sewage treatment device 3. The coke storage tank 1 is used for stacking wet coke and collecting leachate. The coagulation sedimentation tank 2 and the sewage treatment device 3 are prior arts. The coagulation sedimentation tank 2 is used for adding coagulants to make suspended solids, colloidal substances and soluble substances in water aggregate together to form large particle flocs and perform sedimentation separation. The sewage treatment device 3 is used for further treating heavy metals, bacteria, viruses, etc. in the leachate to improve the purification degree of the leachate. The specific purification needs to be determined according to the actual situation. A permeable brick layer 4 is arranged at the bottom inside the coke storage tank 1. The permeable brick belongs to a new type of green environmental protection building material. The raw materials mainly adopt environmental protection materials such as cement, sand, slag, fly ash, etc. for high-pressure forming, and have good water permeability. Through the pore structure inside the brick body, the leachate can quickly penetrate downward, while impurities such as coke powder cannot pass through, having a certain filtering effect. A lower filter screen 5 is laid on the upper surface of the permeable brick layer 4. An upper grille 6 is arranged at intervals above the lower filter screen 5. An upper filter screen 7 is laid on the upper grille 6. The mesh diameter of the upper filter screen 7 is larger than that of the lower filter screen 5. A plurality of drainage troughs 8 are arranged at intervals at the bottom of the coke storage tank 1. A lower grille 9 is arranged at the notch of the drainage trough 8. One end of the drainage trough 8 is provided with a drain pipe 10. The drain pipe 10 is communicated with the inlet of the coagulation sedimentation tank 2. The outlet of the coagulation sedimentation tank 10 is communicated with the inlet of the sewage treatment device 3 through a pipeline.
[0017] When the utility model is in use, the wet coke after coke quenching treatment is sent to the coke storage tank 1 and stacked on the upper grid 6. Water continuously seeps out from the wet coke and drips downward through the filter holes of the upper filter screen 7. At this time, the water carries more impurities such as fine coke powder particles. The lower filter screen 5 filters the water again to remove the impurities with smaller particles in the water. Subsequently, the water continues to fall to reach the permeable brick layer 4, and the impurities in the water are separated again. The relatively pure water falls into the drainage tank 8 and then is successively sent to the coagulation sedimentation tank 2 and the sewage treatment device 3 through the drain pipe 10 for subsequent sewage treatment. The coagulation sedimentation tank 2 adds a coagulant to make the suspended substances, colloid substances and soluble substances in the water gather together to form large particle flocs and perform sedimentation separation. The sewage treatment device 3 is used to further purify the water. The utility model is provided with the coke storage tank 1 for storing wet coke. The leachate seeping out from the wet coke can be completely collected, and the collection effect is good. There will be no problem that the leachate diffuses into the soil or the surrounding environment, and the pollution to the surrounding environment is small. Secondly, while collecting the leachate, the utility model also successively uses the upper filter screen 7, the lower filter screen 5 and the permeable brick layer 4 to filter the leachate, successively removing the particulate impurities such as coke powder in the leachate. The filtering effect is good, and relatively pure water can be obtained, reducing the treatment process and treatment difficulty of the subsequent treatment process. At the same time, various coke powder particle impurities in the leachate are filtered, and the whole collection device is not easily blocked, enabling the long-term normal operation of the leachate collection.
[0018] In order to prevent waterlogging, the bottom of the drainage tank 8 is inclined, and the drain pipe 10 is located at the lower end of the drainage tank 8. The leachate falling into the drainage tank 8 can flow into the drain pipe 10 in time and be discharged.
[0019] A plurality of support columns 11 are arranged between the upper grid 6 and the lower filter screen 5. The upper filter screen 7 is laid on the upper grid 6 for supporting the wet coke. It is found in the use process that since the upper grid 6 is in a suspended state, the middle position is prone to deformation and concave, and with the extension of the use time, the problem of collapse may occur. In order to solve this problem, the support columns 11 are provided to effectively support the upper grid 6, reduce the pressure borne by the upper grid 6 and extend its service life.
[0020] Upper flushing pipes 12 are respectively inclinedly arranged on the side walls of the coke storage tank 1 above the lower filter screen 5 and the upper filter screen 7. The lower end of the upper flushing pipe 12 faces the inside of the coke storage tank 1, and the higher end is communicated with the outlet of the sewage treatment device 3 through a pipeline. A sewage discharge port 13 is arranged on the side wall of the coke storage tank 1 opposite to the upper flushing pipe 12. The upper filter screen 7 and the lower filter screen 5 are both filtering components for leachate, used to filter the leachate. During long-term use, the mesh holes of the filter screens may be clogged to a certain extent, thereby reducing the filtering efficiency of the leachate. At this time, the leachate that has been treated in the sewage treatment device 3 can be used as flushing water to flush the impurities such as coke powder on the upper filter screen 7 and the lower filter screen 5, ensuring that the upper filter screen 7 and the lower filter screen 5 always have good filtering ability.
[0021] Transparent observation windows 14 are respectively arranged on the side walls of the coke storage tank 1 above the lower filter screen 5 and the upper filter screen 7. The observation windows 14 are used to observe the impurities such as coke powder intercepted on the lower filter screen 5 and the upper filter screen 7. When the impurities such as coke powder accumulate too much, in order to ensure the filtering efficiency, they should be cleaned and processed in time. At the same time, it is also convenient to observe the flushing situation of the impurities such as coke powder. When the impurities such as coke powder are flushed clean, the flushing water is stopped.
[0022] A lower flushing pipe 15 is arranged on the side wall of the coke storage tank 1 opposite to the position of the drain pipe 10. During the long-term use of the present invention, although the leachate has passed through the filtration of the upper filter screen 7, the lower filter screen 5 and the permeable brick layer 4 in sequence, there are still inevitably some fine particle impurities in it, and they gradually deposit in the drainage tank 8, which may affect the normal discharge of the leachate. Therefore, when necessary, clean water or the water discharged from the sewage treatment device 3 can be introduced into the lower flushing pipe 15 to flush the sediment in the drainage tank 8, ensuring the smooth drainage in the drainage tank 8.
Claims
1. A wet coke leachate collection and treatment system, comprising a coke storage tank (1), a coagulation sedimentation tank (2) and a sewage processor (3), characterized in that : A permeable brick layer (4) is provided at the bottom inside the coke storage tank (1). A lower filter screen (5) is laid on the upper surface of the permeable brick layer (4). An upper grille (6) is arranged at intervals above the lower filter screen (5). An upper filter screen (7) is laid on the upper grille (6). The pore diameter of the upper filter screen (7) is larger than that of the lower filter screen (5). A plurality of drain grooves (8) are arranged at intervals at the bottom of the coke storage tank (1). A lower grille (9) is arranged at the notch of the drain groove (8). One end of the drain groove (8) is provided with a drain pipe (10). The drain pipe (10) is communicated with the inlet of the coagulation sedimentation tank (2). The outlet of the coagulation sedimentation tank (2) is communicated with the inlet of the sewage treatment device (3) through a pipeline.
2. The wet coke leachate collection and disposal system according to claim 1, characterized in that : The bottom of the drain groove (8) is inclined, and the drain pipe (10) is located at the lower end of the drain groove (8).
3. The wet coke leachate collection and disposal system according to claim 1, characterized in that : A plurality of support columns (11) are arranged between the upper grille (6) and the lower filter screen (5).
4. The wet coke leachate collection and disposal system according to claim 1, characterized in that : Upper flushing pipes (12) are respectively inclined on the side walls of the coke storage tank (1) above the lower filter screen (5) and the upper filter screen (7). The lower end of the upper flushing pipe (12) faces the inside of the coke storage tank (1), and the higher end is communicated with the outlet of the sewage treatment device (3) through a pipeline. A sewage discharge port (13) is arranged on the side wall of the coke storage tank (1) opposite to the upper flushing pipe (12).
5. The wet coke leachate collection and treatment system according to claim 1, characterized in that : Transparent observation windows (14) are respectively arranged on the side walls of the coke storage tank (1) above the lower filter screen (5) and the upper filter screen (7).
6. The wet coke leachate collection and disposal system according to claim 1, characterized in that : A lower flushing pipe (15) is arranged on the side wall of the coke storage tank (1) opposite to the position of the drain pipe (10).