Highly-vacuum ultralow-temperature sludge drying system

Abstract

The invention discloses a highly-vacuum ultralow-temperature sludge drying system. The system comprises a first-stage airtight stock bin, a first spiral conveying device, a connecting bin, a second-stage airtight stock bin and a second spiral conveying device which are sequentially connected from top to bottom, the first spiral conveying device is provided with a first feeding port and a first discharging port, the first feeding port is communicated with the first-stage airtight bin, the first discharging port is communicated with the connecting bin, the top of the first-stage airtight bin is rotationally connected with a first airtight door, and the top of the second-stage airtight bin is rotationally connected with a second airtight door. And a second feeding hole and a second discharging hole are formed in the second spiral conveying device. According to the highly-vacuum ultralow-temperature sludge drying system, a completely-sealed design is adopted, a high vacuum degree exists in the system through the vacuum pump, and an internal temperature field is established through reasonable arrangement. On the premise of ensuring the drying effect, the average drying temperature is greatly reduced, and the operation cost of a user is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of sludge drying, and in particular to a highly vacuum ultra-low temperature sludge drying system. Background Art

[0002] At present, the mainstream sludge drying equipment is divided into indirect and direct drying forms. Among them, the indirect drying is represented by paddle dryers and disc dryers, and the characteristic is that the internal heating medium is medium-pressure steam; the direct drying is represented by belt sludge dryers, and its heat source can be medium-pressure steam. In recent years, heat pump units have also been used to provide cold and hot sources. The drying temperature can reach about 80℃, and the heating COP coefficient can reach more than 3, but the consumed electricity belongs to a high-grade secondary energy, and the drying cost is still high.

[0003] Based on the above situation, the present invention proposes a highly vacuum ultra-low temperature sludge drying system, which can effectively solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide a highly vacuumed ultra-low temperature sludge drying system. The highly vacuumed ultra-low temperature sludge drying system of the present invention adopts a completely sealed design, a high vacuum degree is created inside the system through a vacuum pump, and an internal temperature field is established through a reasonable arrangement. Under the premise of ensuring the drying effect, the average drying temperature is greatly reduced, the heat source restriction conditions are opened, and a cheap low-grade low-temperature heat source is used to reduce the user's operating costs.

[0005] The present invention is achieved through the following technical solutions:

[0006] A highly vacuum ultra-low temperature sludge drying system comprises a primary airtight silo, a first screw conveying device, a connecting silo, a secondary airtight silo and a second screw conveying device connected in sequence from top to bottom;

[0007] The first screw conveying device is provided with a first feed port and a first discharge port, the first feed port is communicated with a first-level airtight silo, the first discharge port is communicated with a connecting silo, the top of the first-level airtight silo is rotatably connected with a first airtight door, the top of the second-level airtight silo is rotatably connected with a second airtight door, the second screw conveying device is provided with a second feed port and a second discharge port, the second feed port is communicated with the second-level airtight silo, the second discharge port is communicated with a circulating working medium manifold, a vacuum vertical disc dryer is arranged in the circulating working medium manifold, the bottom of the circulating working medium manifold is respectively connected with a left discharge buffer bin and a right discharge buffer bin, the bottoms of the left discharge buffer bin and the right discharge buffer bin are both connected to the third screw conveying device, the side of the circulating working medium manifold is connected with a condensate water chamber, and the outer side of the condensate water chamber is connected with a vacuum pump.

[0008] The purpose of the present invention is to provide a highly vacuumed ultra-low temperature sludge drying system. The highly vacuumed ultra-low temperature sludge drying system of the present invention adopts a completely sealed design, a high vacuum degree is created inside the system through a vacuum pump, and an internal temperature field is established through a reasonable arrangement. Under the premise of ensuring the drying effect, the average drying temperature is greatly reduced, the heat source restriction conditions are opened, and a cheap low-grade low-temperature heat source is used to reduce the user's operating costs.

[0009] Preferably, a material guide plate is provided at the first material outlet.

[0010] Preferably, a first arch breaking device is provided in the first-level airtight silo, and a second arch breaking device is provided in the second-level airtight silo.

[0011] Preferably, the vacuum vertical disc dryer comprises a drying main machine, on which a plurality of central material-dropping drying discs and outer material-dropping drying discs are alternately arranged.

[0012] Preferably, a condenser is provided in the condensate water chamber, and a baffle is provided in the middle of the condensate water chamber.

[0013] Preferably, a spray device is provided at the top of the condensation water chamber.

[0014] Preferably, the bottom of the condensate chamber is connected to a low-level condensate pump.

[0015] Preferably, the connection between the circulating working medium manifold and the left and right discharging buffer bins is provided with a primary discharging vacuum gate door, and the connection between the left and right discharging buffer bins and the third screw conveying device is provided with a secondary discharging vacuum gate door.

[0016] Preferably, the first airtight door and the second airtight door are both connected to a hydraulic drive device.

[0017] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0018] The highly vacuum ultra-low temperature sludge drying system of the present invention adopts a completely sealed design, a high vacuum degree is created inside the system through a vacuum pump, and an internal temperature field is established through a reasonable arrangement. Under the premise of ensuring the drying effect, the average drying temperature is greatly reduced, the heat source restriction conditions are opened, and a cheap low-grade low-temperature heat source is used to reduce the user's operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the side cross-sectional structure of the present invention;

[0020] Figure 2 It is a front view structural schematic diagram of the present invention; DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solution of the present invention, the preferred implementation scheme of the present invention is described below in conjunction with specific embodiments. However, it should be understood that the drawings are only used for exemplary description and cannot be understood as a limitation on this patent. In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The positional relationship described in the drawings is only for exemplary description and cannot be understood as a limitation on this patent.

[0022] Embodiment 1:

[0023] like Figures 1 to 2 As shown, the present invention provides a highly vacuum ultra-low temperature sludge drying system, comprising a primary airtight silo 1, a first screw conveying device 2, a connecting silo 3, a secondary airtight silo 4 and a second screw conveying device 5 connected in sequence from top to bottom;

[0024] The first screw conveying device 2 is provided with a first feed port and a first discharge port, the first feed port is connected to the first-level airtight silo 1, the first discharge port is connected to the connecting bin 3, the first-level airtight silo 1 is rotatably connected to the top with a first airtight door 11, the second-level airtight silo 4 is rotatably connected to the top with a second airtight door 41, the second screw conveying device 5 is provided with a second feed port and a second discharge port, the second feed port is connected to the second-level airtight silo 4, the second discharge port is connected to the circulating working medium manifold 6, a vacuum vertical disc dryer is arranged in the circulating working medium manifold 6, the bottom of the circulating working medium manifold 6 is respectively connected to a left discharge buffer bin 71 and a right discharge buffer bin 72, the bottoms of the left discharge buffer bin 71 and the right discharge buffer bin 72 are both connected to the third screw conveying device 8, the side of the circulating working medium manifold 6 is connected to a condensate water chamber 9, and the outside of the condensate water chamber 9 is connected to a vacuum pump 91.

[0025] A two-stage feeding airtight door (first airtight door 11 and second airtight door 41) is used. Under the premise of maintaining the vacuum operation of the equipment, the different switch configurations of the two-stage airtight door are used to ensure continuous feeding inside the equipment. Radar level meters and rotary level meters are set in the first-stage airtight silo 1 and the second-stage airtight silo 4 for easy control and adjustment. Electric vacuum balancing valves are set in the first-stage airtight silo 1 and the second-stage airtight silo 4 to prevent the air pressure of the two-stage silos from being unbalanced when the airtight doors are opened and closed. Rotary level meters (high and low positions) are set in the left discharging buffer silo 71 and the right discharging buffer silo 72 for the control system to determine the switching timing of the discharging systems on both sides.

[0026] The water ring vacuum pump (or water jet type) is used to establish the initial vacuum in the dryer main unit and balance the subsequent air leakage. The condensing chamber is equipped with corresponding condensing equipment and condensate discharge device.

[0027] The feed end is sealed with a two-stage silo, in which the inlet and outlet of the first-stage airtight silo 1 are equipped with airtight gate doors that can be opened and closed automatically. Continuous feeding of materials (sludge) is achieved through different opening and closing timings of the inlet and outlet gate doors.

[0028] In the middle of the two-stage silo, the first-stage airtight silo 1 adopts an anti-bridging and arch-breaking material reclaimer, and a first screw conveying device 2 is arranged at its lower part to prevent part of the material from overflowing when the first-stage airtight silo 1 is in the feeding state (that is, the first airtight door 11 is open and the second airtight door 41 is closed), thereby contaminating the second airtight door 41 structure and causing equipment failure.

[0029] Embodiment 2:

[0030] like Figures 1 to 2 As shown, the present invention provides a highly vacuum ultra-low temperature sludge drying system, comprising a primary airtight silo 1, a first screw conveying device 2, a connecting silo 3, a secondary airtight silo 4 and a second screw conveying device 5 connected in sequence from top to bottom;

[0031] The first screw conveying device 2 is provided with a first feed port and a first discharge port, the first feed port is communicated with the first-level airtight silo 1, the first discharge port is communicated with the connecting bin 3, the first-level airtight silo 1 is rotatably connected to the top with a first airtight door 11, the second-level airtight silo 4 is rotatably connected to the top with a second airtight door 41, the second screw conveying device 5 is provided with a second feed port and a second discharge port, the second feed port is communicated with the second-level airtight silo 4, the second discharge port is communicated with a circulating working medium header 6, a vacuum vertical disc dryer is arranged in the circulating working medium header 6, the bottom of the circulating working medium header 6 is respectively connected to a left discharge buffer bin 71 and a right discharge buffer bin 72, the bottoms of the left discharge buffer bin 71 and the right discharge buffer bin 72 are both connected to the third screw conveying device 8, the side of the circulating working medium header 6 is connected to a condensate water chamber 9, the water vapor generated during the drying process enters the condenser 92 through the right connecting channel, and the outside of the condensate water chamber 9 is connected to a vacuum pump 91. The vacuum pump 91 may be a water jet vacuum pump.

[0032] A material guide plate 21 is provided at the first material outlet.

[0033] The material guide plate 21 can be provided to guide the material flow to the secondary airtight silo 4 .

[0034] Furthermore, in another embodiment, a first arch breaking device 12 is provided in the primary airtight silo 1 , and a second arch breaking device 42 is provided in the secondary airtight silo 4 .

[0035] The first arch breaking device 12 and the second arch breaking device 42 are anti-bridging arch breaking devices. The anti-bridging arch breaking devices belong to the prior art and will not be described in detail.

[0036] Furthermore, in another embodiment, the vacuum vertical disc dryer includes a drying main unit 61 , and the drying main unit 61 is alternately provided with a plurality of central material-dropping drying discs 62 and outer material-dropping drying discs 63 .

[0037] The main shaft of the vacuum vertical disc dryer is arranged in the center. The upper main shaft section (drive end) is sealed with elastic seal to prevent air from entering the equipment. The lower bearing is arranged inside and only dust-proof treatment is performed. Between every two discs, an inclination-adjustable inclined scraper is arranged to move the sludge along the normal direction of the disc.

[0038] After the material enters the disc dryer, it falls onto the hollow disc, which is filled with a working medium (such as hot water, low-pressure steam extraction, etc.) at 60-80°C. The disc is provided with a scraper group rotating around the main axis to move the material (sludge) along the normal direction of the disc. On the lower disc, a scraper group with the opposite direction is provided to move the material outward, and this is repeated until the material falls into the outlet below the drying main unit 61.

[0039] Furthermore, in another embodiment, a condenser 92 is provided in the condensate water chamber 9 , and a baffle is provided in the middle of the condensate water chamber 9 .

[0040] The above structure can improve the airflow disturbance effect.

[0041] Furthermore, in another embodiment, a spray device is provided at the top of the condensation water chamber 9 .

[0042] The spray device is used as a cleaning device for the condenser 92 tube bundle, and can also improve the vacuum degree of the equipment under certain working conditions.

[0043] Furthermore, in another embodiment, the bottom of the condensate chamber 9 is connected to a low-level condensate pump.

[0044] Low-level condensate pumps are used to remove condensate or spray water.

[0045] Furthermore, in another embodiment, a first-level discharge vacuum gate door 73 is provided at the connection between the circulating working medium manifold 6 and the left discharge buffer bin 71 and the right discharge buffer bin 72, and a second-level discharge vacuum gate door 74 is provided at the connection between the left discharge buffer bin 71, the right discharge buffer bin 72 and the third screw conveying device 8.

[0046] Each vacuum buffer discharge bin is equipped with a vacuum balance pipe connected to the main machine, and the vacuum pre-establishment / pre-destruction is achieved through an electric balance valve / destruction valve.

[0047] Furthermore, in another embodiment, both the first airtight door 11 and the second airtight door 41 are connected to a hydraulic drive device.

[0048] The airtight door is driven by a hydraulic push rod to achieve initial locking of the airtight door, and then the door panel is self-locked by the air pressure difference on both sides under the change of the balance valve or different working conditions.

[0049] According to the description and drawings of the present invention, those skilled in the art can easily manufacture or use the high-vacuum ultra-low temperature sludge drying system of the present invention, and can produce the positive effects described in the present invention.

[0050] Unless otherwise specified, in the present invention, the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicating orientation or positional relationships are based on the orientation or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the orientation or positional relationship in the present invention are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood in conjunction with the drawings and according to specific circumstances.

[0051] Unless otherwise clearly specified and limited, in the present invention, the terms "disposed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A highly vacuum ultra-low temperature sludge drying system, characterized by: It includes a primary airtight silo, a first screw conveying device, a connecting silo, a secondary airtight silo and a second screw conveying device which are sequentially connected from top to bottom; The first screw conveying device is provided with a first feed port and a first discharge port, the first feed port is communicated with a first-level airtight silo, the first discharge port is communicated with a connecting silo, the top of the first-level airtight silo is rotatably connected with a first airtight door, the top of the second-level airtight silo is rotatably connected with a second airtight door, the second screw conveying device is provided with a second feed port and a second discharge port, the second feed port is communicated with the second-level airtight silo, the second discharge port is communicated with a circulating working medium manifold, a vacuum vertical disc dryer is arranged in the circulating working medium manifold, the bottom of the circulating working medium manifold is respectively connected with a left discharge buffer bin and a right discharge buffer bin, the bottoms of the left discharge buffer bin and the right discharge buffer bin are both connected to the third screw conveying device, the side of the circulating working medium manifold is connected with a condensate water chamber, and the outer side of the condensate water chamber is connected with a vacuum pump.

2. The high vacuum ultra-low temperature sludge drying system according to claim 1 is characterized in that: A material guide plate is provided at the first material outlet.

3. The high vacuum ultra-low temperature sludge drying system according to claim 1 is characterized in that: A first arch breaking device is provided in the first-level airtight silo, and a second arch breaking device is provided in the second-level airtight silo.

4. The high vacuum ultra-low temperature sludge drying system according to claim 1 is characterized in that: The vacuum vertical disc drying machine comprises a drying main machine, on which a plurality of central material-dropping drying discs and outer material-dropping drying discs are alternately arranged.

5. The high vacuum ultra-low temperature sludge drying system according to claim 1 is characterized in that: A condenser is arranged in the condensate water chamber, and a baffle is arranged in the middle of the condensate water chamber.

6. The high vacuum ultra-low temperature sludge drying system according to claim 1 is characterized in that: A spray device is provided on the top of the condensate water chamber.

7. The high vacuum ultra-low temperature sludge drying system according to claim 1 is characterized by: The bottom of the condensate chamber is connected to a low-level condensate pump.

8. The high vacuum ultra-low temperature sludge drying system according to claim 1 is characterized by: A primary discharge vacuum gate door is provided at the connection between the circulating working medium manifold and the left discharge buffer bin and the right discharge buffer bin, and a secondary discharge vacuum gate door is provided at the connection between the left discharge buffer bin, the right discharge buffer bin and the third screw conveying device.

9. The high vacuum ultra-low temperature sludge drying system according to claim 1 is characterized in that: The first airtight door and the second airtight door are both connected to a hydraulic drive device.

Images