Screening slag vacuum conveying system and method for screen slag with a grid spacing of ≥10mm

Abstract

The present invention discloses a vacuum conveying system and method for screen residue with a grid pitch of 10 mm or more. The system includes a primary conveying screw, a drying device, a crusher, a secondary conveying screw, and a discharge buffer device. The primary conveying feed port is connected to a coarse grid press / medium grid press. The drying device is used to send high-pressure hot air into the primary conveying screw to heat and dry the screen residue. The drying device is connected to the primary conveying screw. The crusher is connected to the discharge port of the primary conveying screw. The secondary conveying screw is respectively connected to the crusher and the discharge buffer device. The discharge buffer device is used to buffer the screen residue conveyed by the secondary conveying screw. The present invention uses sealed transportation through pipelines to achieve fully enclosed transportation of screen residue, ensuring the overall environment of the screen residue pretreatment area of ​​the sewage treatment plant, and fundamentally solving the problem of collecting and disposing of coarse and medium screen residue with a grid pitch of 10 mm or more.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and more particularly to a vacuum conveying system and method for screen residue with a screen pitch of ≥10 mm. Background Art

[0002] The pre-treatment process of a sewage treatment plant typically uses coarse and medium screens with a pitch greater than 10mm to remove various floating and suspended solids from the wastewater. These solids are known as screenings. If not properly handled, these screenings can cause problems and impact subsequent treatment processes. Therefore, effective screenings collection and treatment is crucial.

[0003] Figure 1 It is a system for collecting and conveying the original coarse screen residue. The residue processed by the coarse screen 1 is conveyed by the shaftless screw conveyor 2 to the press 3 for pressing and dehydration, and then sent to the trash can 4; Figure 2 It is the original medium screen slag collection and transportation system. The slag processed by the medium screen 5 is transported to the press 3 through the screw conveyor 6 for pressing and dehydration, and then sent to the garbage bin 4. It is then collected by manual pushing and transported for external treatment. The collection and transportation of slag in this way has the following problems: (1) The slag and sediment have a strong odor, and the concentration of toxic and harmful gases is high, which has a certain impact on the health of the workers; (2) It is necessary to have someone on duty 24 hours a day to put the slag of the coarse and medium screens into the garbage bin and then transport it to the corresponding area, and then load it into trucks for external treatment, which consumes a lot of manpower; (3) The slag is prone to "running, bubbling, dripping, and leaking" during transportation, which has a certain impact on the overall environment of the pretreatment area. Summary of the Invention

[0004] In view of the above-mentioned defects in the prior art, the purpose of the present invention is to provide a vacuum conveying system and method for screen residue with a grid pitch ≥10mm, which performs sealed transportation through pipelines to achieve fully enclosed transportation of screen residue, ensure the overall environment of the screen residue pretreatment area of ​​the sewage treatment plant, and fundamentally solve the problem of collection and disposal of coarse and medium screen residue with a grid pitch ≥10mm.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A first aspect of the present invention provides a vacuum conveying system for screen residue with a screen pitch of ≥10 mm, comprising a primary conveying screw, a drying device, a crusher, a secondary conveying screw, and a discharge buffer device;

[0007] The primary conveying screw is used to convey the screen residue after squeezing and dehydration to the crusher; the feed port of the primary conveying is connected to the coarse screen press / medium screen press;

[0008] The drying device is used to send high-pressure hot air into the first-stage conveying screw to heat and dry the screenings; the drying device is connected to the first-stage conveying screw;

[0009] The crusher is used to crush and shape the screenings conveyed by the first-stage conveying screw; the crusher is connected to the discharge port of the first-stage conveying screw;

[0010] The secondary conveying screw is used to convey the crushed and shaped screenings to the unloading buffer device, and the secondary conveying screw is connected to the crusher and the unloading buffer device respectively;

[0011] The unloading buffer device is used to buffer the screenings conveyed by the secondary conveying screw.

[0012] Preferably, the feed end of the first-stage conveying screw is connected to the coarse grid press / medium grid press through a conveying pipe, and the feed end of the first-stage conveying screw is provided with one or two feed ports.

[0013] Preferably, the feed port of the first-stage conveying screw is provided with a hot air inlet connected to the drying device, and the discharge port of the conveying screw is provided with a hot air outlet connected to the drying device.

[0014] Preferably, the first-level conveying screw is arranged obliquely between the press and the crusher; the feed end of the first-level conveying screw close to the press is fixed by a mounting frame, and the discharge port at the other end of the first-level conveying screw is connected to the feed port of the crusher.

[0015] Preferably, the drying device is connected to the feed port and the discharge port of the first-stage conveying screw through a high-temperature resistant hose.

[0016] A second aspect of the present invention provides a method for vacuum conveying screenings with a grid pitch of ≥10 mm, wherein the vacuum conveying system for screenings with a grid pitch of ≥10 mm as described in the first aspect of the present invention is used to perform the following steps:

[0017] S1, the coarse screen residue / medium screen residue is squeezed and dehydrated and then enters the first-stage conveying screw, where it is heated and dried under the action of high-pressure hot air;

[0018] S2, the heated and dried screenings are transported to the crusher for crushing and shaping;

[0019] S3, the crushed and shaped screenings are transported to the unloading buffer device through the secondary conveying screw, and then extracted through the vacuum pipe.

[0020] Preferably, in step S1, the temperature of the high-pressure hot air is 130-140° C., and the moisture content of the screens after heating and drying is controlled to be below 10%.

[0021] Preferably, in step S2, the particle size of the crushed and shaped screenings is 15 to 20 mm.

[0022] The present invention provides a vacuum conveying system and method for screen residue with a screen pitch of ≥10 mm, which has the following advantages:

[0023] 1. The present invention is mainly for the screenings of coarse and medium grids with a grid pitch of ≥10mm. After passing through the first-level conveying screw, heating and drying, crushing and shaping, it is transported to the unloading buffer device through the second-level conveying screw, and finally extracted through the vacuum pipeline, thereby realizing the fully enclosed transportation of the screenings and ensuring the overall environment of the pretreatment area;

[0024] 2. The present invention reduces operating costs, alleviates labor intensity, improves the working environment, and enhances the automated operation capability of screen slag conveying by optimizing the process flow;

[0025] 3. The present invention fundamentally solves the problem of collecting and disposing of coarse and medium screen slag with a grid pitch of ≥10mm, and realizes the fully enclosed operation of the coarse and medium screen slag collection and transportation process, which not only improves the working environment and reduces operating costs, but also reduces the impact on operators. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a structural diagram of the original coarse screen slag collection and transportation system;

[0027] Figure 2 This is a structural diagram of the original screen slag collection and transportation system;

[0028] Figure 3 It is a structural schematic diagram of the vacuum conveying system of the present invention for screen residue with a screen pitch of ≥10 mm;

[0029] Figure 4 In (a), Figure 3 The connection diagram of the first-stage conveying screw and the crusher, (b) is Figure 3 Layout diagram of the first and second conveying screws;

[0030] Figure 5 2 is a schematic structural diagram of a vacuum conveying system for screen residue with a screen pitch of ≥10 mm in another embodiment of the invention;

[0031] Figure 6 In (a), Figure 5 The connection diagram of the middle-level conveying screw and the crusher, (b) is Figure 5 Layout diagram of the first-stage conveying screw and the second-stage conveying screw;

[0032] Among them, 1. coarse screen; 2. shaftless screw conveyor; 3. press; 4. trash can; 5. medium screen; 6. screw conveyor; 10. primary conveying screw; 11. feed port; 12. discharge port; 13. mounting frame; 20. crusher; 30. secondary conveying screw; 40. unloading buffer device; 50. drying device; 51. high-pressure hot air blower; 52. blower; 53. high-temperature resistant hose. DETAILED DESCRIPTION

[0033] In order to better understand the above technical solutions of the present invention, the technical solutions of the present invention are further described below with reference to the accompanying drawings and embodiments.

[0034] During the operation of the sewage treatment plant, the screen residue produced by the coarse and medium screens with a screen pitch greater than 10mm in the pretreatment area needs to be put into a trash can by someone within 24 hours and then transported to the corresponding area, and then loaded onto trucks for transportation and disposal. This transportation method has many problems and there is no similar method to learn from. Therefore, after an in-depth analysis and research on the sewage plant pretreatment workshop, the original open-ground sewage pretreatment area was eventually transferred to an underground sealed space for treatment, and the vacuum adsorption principle was used to transport the screen residue and other garbage from various places to the ground layer through a closed pipeline for transportation. Various treatment equipment was configured in the underground sealed space, and the above-ground part could be transformed into a garden-style landscape, thereby reducing environmental pollution during sewage treatment, effectively improving the plant environment of the sewage plant, and improving the air quality of the plant. On this basis, the transformation of the sewage plant pretreatment ultra-clean space was completed.

[0035] The present invention is mainly aimed at the pretreatment and transportation of coarse and medium screen residues with a grid pitch greater than 10 mm. It is the core technology in the ultra-clean space renovation plan for sewage treatment plants. At the same time, during the renovation process, by constantly discovering and solving problems, and improving and refining methods, the present invention finally achieves continuous operation of vacuum transportation and fully enclosed transportation of screen residues, ensuring the overall environment of the pretreatment area.

[0036] Combine Figure 3 、 Figure 5 As shown, the present invention provides a vacuum conveying system for screen residue with a screen pitch ≥10 mm, which is arranged in an underground sealed space and includes a first-level conveying screw 10, a drying device 50, a crusher, a second-level conveying screw 30 and a unloading buffer device 40.

[0037] Combine Figure 3 、 Figure 5 As shown, the first-stage conveying screw 10 is used to convey the screen residue after squeezing and dehydration to the crusher; the feed port 11 of the first-stage conveying screw 10 is connected to the coarse screen press / medium screen press. Figures 3 to 6As shown, the feed end of the first-stage conveying screw 10 is connected to the coarse grid press / medium grid press through a conveying pipeline, and the feed end of the first-stage conveying screw 10 is provided with one or two feed ports 11; Figure 3 、 Figure 4 As shown in (b), for the collection and transportation of coarse screen residue, two feed ports 11 are set at the feed end of the first-stage conveying screw 10, which are respectively connected to two coarse screen presses; Figure 5 、 Figure 6 As shown in (b), for the collection and transportation of the middle grid slag, the feeding end of the first-stage conveying screw 10 is provided with a feeding port 11, which is connected to a middle grid press. Figure 4 、 Figure 6 As shown, the feed port 11 of the first-stage conveying screw 10 is provided with a hot air inlet connected to the drying device 50, and the discharge port 12 of the first-stage conveying screw 10 is provided with a hot air outlet connected to the drying device 50. Figure 4 (a) Figure 6 As shown in (a), the first-level conveying screw 10 is tilted and arranged between the press and the crusher. The first-level conveying screw 10 is fixed by a mounting frame 13 near the feed end of the press, and the discharge port 12 at the other end is connected to the feed port 11 of the crusher. The tilt angle of the first-level conveying screw 10 can be adjusted according to the on-site dimensions.

[0038] Combine Figure 3 、 Figure 5 As shown, the drying device 50 is used to deliver high-pressure hot air into the primary conveying screw 10 to heat and dry the screenings; the drying device 50 is connected to the primary conveying screw 10. In a specific embodiment, the drying device 50 includes a blower 52 and a high-pressure hot air blower 51 connected to the blower 52. The high-pressure hot air blower 51 is respectively connected to the feed port 11 and the discharge port 12 of the primary conveying screw 10 via high-temperature resistant hoses 53, so as to deliver the high-pressure hot air to the primary conveying screw 10 through the high-temperature resistant hoses 53.

[0039] Combine Figure 3 、 Figure 5 As shown, the crusher is used to crush and shape the screenings conveyed by the first-stage conveying screw 10; the feed port of the crusher is connected to the discharge port 12 of the first-stage conveying screw 10.

[0040] Combine Figure 3 、 Figure 5 As shown, the secondary conveying screw 30 is used to convey the crushed and shaped screenings to the unloading buffer device 40. The secondary conveying screw 30 is connected to the crusher and the unloading buffer device 40 respectively.

[0041] Combine Figure 3 、 Figure 5As shown, the unloading buffer device 40 is used to buffer the screenings conveyed by the secondary conveying screw 30. The unloading buffer device 40 is connected to the subsequent processing system through a vacuum pipeline, and the screenings therein are extracted through the vacuum pipeline.

[0042] The present invention also provides a method for vacuum conveying screenings with a grid pitch of ≥10 mm, which uses the above-mentioned vacuum conveying system for screenings with a grid pitch of ≥10 mm to perform the following steps:

[0043] S1, the coarse grid screenings / medium grid screenings are squeezed and dehydrated and then enter the first-stage conveying screw 10, where they are heated and dried under the action of high-pressure hot air;

[0044] The coarse screen residue after the coarse screen treatment / the medium screen residue after the medium screen treatment enters the press for squeezing and dehydration, and then enters the first-stage conveying screw 10 through the conveying pipe. The high-pressure hot air is sent to the first-stage conveying screw 10 through the drying device 50 to heat and dry the screen residue. The temperature of the high-pressure hot air is 130-140°C, and the moisture content of the screen residue after heating and drying is controlled below 10%.

[0045] S2, the heated and dried screenings are transported to the crusher for crushing and shaping;

[0046] The heated and dried screenings enter the crusher from the discharge port 12 of the first-stage conveying screw 10 to be crushed and shaped. The particle size of the crushed and shaped screenings is 15 to 20 mm.

[0047] S3, the crushed and shaped screenings are transported to the unloading buffer device 40 through the secondary conveying screw 30, and then extracted through the vacuum pipe.

[0048] To sum up, the vacuum conveying system and method for screen residue with a grid pitch ≥10mm of the present invention is mainly aimed at the screen residue of coarse and medium grids with a grid pitch greater than 10mm. After passing through a first-level conveying screw, heating and drying, crushing and shaping, it is conveyed to the unloading buffer device through a second-level conveying screw, and finally vacuum conveyed, thereby realizing fully enclosed conveying of the screen residue and ensuring the overall environment of the pretreatment area.

[0049] The renovation of the ultra-clean space for sewage treatment plant pretreatment is a major engineering project in Shanghai and is also the first application in the pretreatment area of ​​a sewage treatment plant. As the core technology in the renovation plan for the ultra-clean space for sewage treatment plant pretreatment, this invention is aimed at the pretreatment and transportation of coarse and medium screen residues with a grid pitch greater than 10mm. It uses sealed transportation through pipelines to achieve fully enclosed transportation of the screen residue, ensuring the overall environment of the sewage treatment plant screen residue pretreatment area, and fundamentally solving the collection and disposal problems of coarse and medium screen residues with a grid pitch ≥10mm.

[0050] Those skilled in the art should recognize that the above embodiments are merely intended to illustrate the present invention and are not intended to limit the present invention. As long as they are within the spirit of the present invention, any changes or modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A vacuum conveying system for screen residue with a screen pitch of ≥10 mm, characterized in that: It includes a first-stage conveying screw, a drying device, a crusher, a second-stage conveying screw and a discharge buffer device; The primary conveying screw is used to convey the screen residue after squeezing and dehydration to the crusher; the feed port of the primary conveying is connected to the coarse screen press / medium screen press; The drying device is used to send high-pressure hot air into the first-stage conveying screw to heat and dry the screenings; the drying device is connected to the first-stage conveying screw; The crusher is used to crush and shape the screenings conveyed by the first-stage conveying screw; the crusher is connected to the discharge port of the first-stage conveying screw; The secondary conveying screw is used to convey the crushed and shaped screenings to the unloading buffer device, and the secondary conveying screw is connected to the crusher and the unloading buffer device respectively; The unloading buffer device is used to buffer the screenings conveyed by the secondary conveying screw.

2. The vacuum conveying system for screenings with a grid pitch of ≥10 mm according to claim 1, characterized in that: The feed end of the first-stage conveying screw is connected to the coarse grid press / medium grid press through a conveying pipeline, and the feed end of the first-stage conveying screw is provided with one or two feed ports.

3. The vacuum conveying system for screenings with a grid pitch of ≥10 mm according to claim 2, characterized in that: The feed port of the first-stage conveying screw is provided with a hot air inlet connected to the drying device, and the discharge port of the conveying screw is provided with a hot air outlet connected to the drying device.

4. The vacuum conveying system for screenings with a grid pitch of ≥10 mm according to claim 1, characterized in that: The first-level conveying screw is arranged obliquely between the press and the crusher; the first-level conveying screw is fixed by a mounting frame near the feed end of the press, and the discharge port at the other end of the first-level conveying screw is connected to the feed port of the crusher.

5. The vacuum conveying system for screenings with a grid pitch of ≥10 mm according to claim 1, characterized in that: The drying device is connected to the feed port and the discharge port of the first-level conveying screw through a high-temperature resistant hose.

6. A vacuum conveying method for screen residue with a grid pitch of ≥10 mm, characterized in that: The following steps are performed using the vacuum conveying system for screenings with a grid pitch of ≥10 mm as described in any one of claims 1 to 5: S1, the coarse screen residue / medium screen residue is squeezed and dehydrated and then enters the first-stage conveying screw, where it is heated and dried under the action of high-pressure hot air; S2, the heated and dried screenings are transported to the crusher for crushing and shaping; S3, the crushed and shaped screenings are transported to the unloading buffer device through the secondary conveying screw, and then extracted through the vacuum pipe.

7. The vacuum conveying method for screenings with a grid pitch of ≥10 mm according to claim 6, characterized in that: In the step S1, the temperature of the high-pressure hot air is 130-140° C., and the moisture content of the heated and dried screenings is controlled to be below 10%.

8. The vacuum conveying method for screenings with a grid pitch of ≥10 mm according to claim 6, characterized in that: In the step S2, the particle size of the crushed and shaped screenings is 15 to 20 mm.

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