Highly-vacuum ultralow-temperature sludge drying system

Abstract

The utility model discloses a highly-vacuum ultralow-temperature sludge drying system which 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 disclosed by the utility model, a completely sealed design is adopted, a relatively 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] This utility model relates to the field of sludge drying technology, specifically to a high-vacuum ultra-low temperature sludge drying system. Background Technology

[0002] Currently, mainstream sludge drying equipment is divided into indirect and direct drying methods. Indirect drying is represented by paddle dryers and disc dryers, characterized by using medium-pressure steam as the internal heating medium. Direct drying is represented by belt dryers, whose heat source can also be medium-pressure steam. In recent years, heat pump units have also been used to provide heat sources, achieving drying temperatures of around 80℃ and a heating COP of over 3. However, the electricity consumed is a high-grade secondary energy source, and the drying cost remains high.

[0003] Based on the above, this utility model proposes a high-vacuum ultra-low temperature sludge drying system, which can effectively solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a high-vacuum, ultra-low temperature sludge drying system. This high-vacuum, ultra-low temperature sludge drying system employs a completely sealed design, using a vacuum pump to create a high vacuum within the system, and establishing an internal temperature field through a rational layout. While ensuring drying efficiency, it significantly reduces the average drying temperature, removes heat source limitations, and utilizes inexpensive, low-grade, low-temperature heat sources, thereby reducing the user's operating costs.

[0005] This utility model is achieved through the following technical solution:

[0006] A high-vacuum ultra-low temperature sludge drying system includes, from top to bottom, a primary airtight silo, a first screw conveyor, a connecting silo, a secondary airtight silo, and a second screw conveyor.

[0007] The first screw conveyor is provided with a first inlet and a first outlet. The first inlet is connected to a primary airtight silo, and the first outlet is connected to a connecting silo. A first airtight door is rotatably connected to the top of the primary airtight silo, and a second airtight door is rotatably connected to the top of the secondary airtight silo. The second screw conveyor is provided with a second inlet and a second outlet. The second inlet is connected to the secondary airtight silo, and the second outlet is connected to a circulating working medium header. A vacuum vertical disc dryer is provided inside the circulating working medium header. A left outlet buffer silo and a right outlet buffer silo are respectively connected to the bottom of the circulating working medium header. The bottoms of the left outlet buffer silo and the right outlet buffer silo are both connected to a third screw conveyor. A condensate chamber is connected to the side of the circulating working medium header, and a vacuum pump is connected to the outside of the condensate chamber.

[0008] The purpose of this invention is to provide a high-vacuum, ultra-low temperature sludge drying system. This high-vacuum, ultra-low temperature sludge drying system employs a completely sealed design, using a vacuum pump to create a high vacuum within the system, and establishing an internal temperature field through a rational layout. While ensuring drying efficiency, it significantly reduces the average drying temperature, removes heat source limitations, and utilizes inexpensive, low-grade, low-temperature heat sources, thereby reducing the user's operating costs.

[0009] Preferably, a guide plate is provided at the first discharge port.

[0010] Preferably, the primary airtight silo is equipped with a first arch-breaking device, and the secondary airtight silo is equipped with a second arch-breaking device.

[0011] Preferably, the vacuum vertical disc dryer includes a drying host, on which multiple central discharge drying discs and outer discharge drying discs are alternately arranged.

[0012] Preferably, the condensate chamber is equipped with a condenser, and the condensate chamber is equipped with a baffle plate in the middle.

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

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

[0015] Preferably, a primary discharge vacuum gate is provided at the connection between the circulating working medium header and the left discharge buffer chamber and the right discharge buffer chamber, and a secondary discharge vacuum gate is provided at the connection between the left discharge buffer chamber, the right discharge buffer chamber and the third screw conveyor.

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

[0017] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0018] This invention relates to a high-vacuum, ultra-low temperature sludge drying system. It employs a completely sealed design, using a vacuum pump to create a high degree of vacuum within the system and a rationally arranged internal temperature field. While ensuring effective drying, it significantly reduces the average drying temperature, eliminates heat source limitations, and utilizes inexpensive, low-grade, low-temperature heat sources, thereby reducing operating costs for users. Attached Figure Description

[0019] Figure 1 This is a side sectional view of the present invention.

[0020] Figure 2 This is a front view structural diagram of the present utility model; Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solution of this utility model, the preferred embodiments of this utility model are described below in conjunction with specific examples. However, it should be understood that the accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. For better illustration of this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable that some well-known structures and their descriptions may be omitted in the drawings for those skilled in the art. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0022] Example 1:

[0023] like Figures 1 to 2 As shown, this utility model provides a high vacuum ultra-low temperature sludge drying system, which includes a primary airtight silo 1, a first screw conveyor 2, a connecting silo 3, a secondary airtight silo 4, and a second screw conveyor 5 connected from top to bottom.

[0024] The first screw conveyor 2 is provided with a first inlet and a first outlet. The first inlet is connected to the first-stage airtight silo 1, and the first outlet is connected to the connecting silo 3. The top of the first-stage airtight silo 1 is rotatably connected to a first airtight door 11, and the top of the second-stage airtight silo 4 is rotatably connected to a second airtight door 41. The second screw conveyor 5 is provided with a second inlet and a second outlet. The second inlet is connected to the second-stage airtight silo 4, and the second outlet is connected to the circulating working medium header 6. The circulating working medium header 6 is provided with a vacuum vertical disc dryer. The bottom of the circulating working medium header 6 is respectively connected to a left outlet buffer silo 71 and a right outlet buffer silo 72. The bottoms of the left outlet buffer silo 71 and the right outlet buffer silo 72 are both connected to a third screw conveyor 8. The side of the circulating working medium header 6 is connected to a condensate chamber 9, and the outside of the condensate chamber 9 is connected to a vacuum pump 91.

[0025] A two-stage airtight feeding system (first airtight door 11 and second airtight door 41) is adopted. While maintaining vacuum operation of the equipment, continuous feeding is ensured through different opening and closing configurations of the two airtight doors. Both the first-stage airtight silo 1 and the second-stage airtight silo 4 are equipped with radar level gauges and rotary level gauges for easy control and adjustment. Both the first-stage airtight silo 1 and the second-stage airtight silo 4 are equipped with electric vacuum balancing valves to prevent pressure imbalance between the two silos when the airtight doors open and close. Rotary level gauges (high and low positions) are installed in the left discharge buffer silo 71 and the right discharge buffer silo 72 to help the control system determine the switching timing of the discharge systems on both sides.

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

[0027] The feed end seal adopts a two-stage silo. The inlet and outlet of the first-stage airtight silo 1 are equipped with airtight gates that can be automatically opened and closed. By different opening and closing sequences of the inlet and outlet gates, the continuous feeding of materials (sludge) can be achieved.

[0028] Between the two silos, the first-stage airtight silo 1 adopts an anti-bridging and arch-breaking material handling machine, and a first screw conveyor 2 is installed at its lower part to prevent some material from overflowing when the first-stage airtight silo 1 is in the feeding state (i.e., the first airtight door 11 is open and the second airtight door 41 is closed), thereby contaminating the structure of the second airtight door 41 and causing equipment failure.

[0029] Example 2:

[0030] like Figures 1 to 2 As shown, this utility model provides a high vacuum ultra-low temperature sludge drying system, which includes a primary airtight silo 1, a first screw conveyor 2, a connecting silo 3, a secondary airtight silo 4, and a second screw conveyor 5 connected from top to bottom.

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

[0032] A guide plate 21 is provided at the first discharge port.

[0033] Setting up guide plate 21 can guide the logistics to the secondary airtight silo 4.

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

[0035] The first arch-breaking device 12 and the second arch-breaking device 42 are anti-bridging arch-breaking devices. Anti-bridging arch-breaking devices are existing technology and will not be described in detail.

[0036] Furthermore, in another embodiment, the vacuum vertical disc dryer includes a drying host 61, on which a plurality of central discharge drying discs 62 and outer discharge drying discs 63 are alternately arranged.

[0037] The vacuum vertical disc dryer features a centrally located main shaft. The upper section of the main shaft (drive end) is sealed with an elastic seal to prevent air from entering the equipment. The lower bearing is internally sealed and only has dustproof treatment. Between every two discs, there is an adjustable-angle scraper to move the sludge along the normal direction of the disc.

[0038] After the material enters the disc dryer, it falls onto a hollow disc filled with a working medium (such as hot water or low-pressure steam) at 60-80°C. A scraper assembly rotating around the main shaft is installed on the disc, causing the material (sludge) to move along the normal direction of the disc. On the lower disc, a scraper assembly moving in the opposite direction causes the material to move outwards. This process is repeated until the material falls into the outlet below the drying unit 61.

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

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

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

[0042] The spray device serves as a cleaning device for the condenser tube bundle 92 and can also improve the vacuum level of the equipment under certain operating conditions.

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

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

[0045] Furthermore, in another embodiment, a primary discharge vacuum gate 73 is provided at the connection between the circulating working medium header 6 and the left discharge buffer chamber 71 and the right discharge buffer chamber 72, and a secondary discharge vacuum gate 74 is provided at the connection between the left discharge buffer chamber 71, the right discharge buffer chamber 72 and the third screw conveyor 8.

[0046] Each vacuum buffer discharge hopper is equipped with a vacuum balance pipe connected to the main unit, and the pre-establishment / pre-destruction of vacuum 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 initially locked by a hydraulic push rod, and then the door panel is self-locked by the pressure difference between the two sides under the influence of the balance valve or changes in different working conditions.

[0049] Based on the description and accompanying drawings of this utility model, those skilled in the art can easily manufacture or use the high-vacuum ultra-low temperature sludge drying system of this utility model, and can produce the positive effects described in this utility model.

[0050] Unless otherwise specified, in this utility model, terms such as "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe orientation or positional relationships in this utility model are for illustrative purposes only and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood in conjunction with the accompanying drawings and according to the specific circumstances.

[0051] Unless otherwise expressly specified and limited, the terms "set up," "connected," and "linked" in this utility model should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0052] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A high-vacuum, ultra-low temperature sludge drying system, characterized in that: It includes, from top to bottom, a primary airtight silo, a first screw conveyor, a connecting silo, a secondary airtight silo, and a second screw conveyor; The first screw conveyor is provided with a first inlet and a first outlet. The first inlet is connected to a primary airtight silo, and the first outlet is connected to a connecting silo. A first airtight door is rotatably connected to the top of the primary airtight silo, and a second airtight door is rotatably connected to the top of the secondary airtight silo. The second screw conveyor is provided with a second inlet and a second outlet. The second inlet is connected to the secondary airtight silo, and the second outlet is connected to a circulating working medium header. A vacuum vertical disc dryer is provided inside the circulating working medium header. A left outlet buffer silo and a right outlet buffer silo are respectively connected to the bottom of the circulating working medium header. The bottoms of the left outlet buffer silo and the right outlet buffer silo are both connected to a third screw conveyor. A condensate chamber is connected to the side of the circulating working medium header, and a vacuum pump is connected to the outside of the condensate chamber.

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

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

4. The high-vacuum ultra-low temperature sludge drying system according to claim 1, characterized in that: The vacuum vertical disc dryer includes a drying host, on which multiple central discharge drying discs and outer discharge drying discs are alternately arranged.

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

6. The high-vacuum cryogenic sludge drying system according to claim 1, characterized in that: A spray device is installed at the top of the condensate chamber.

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

8. The high-vacuum cryogenic sludge drying system according to claim 1, characterized in that: The connection between the circulating working medium header and the left and right discharge buffer chambers is equipped with a primary discharge vacuum gate, and the connection between the left and right discharge buffer chambers and the third spiral conveyor is equipped with a secondary discharge vacuum gate.

9. The high-vacuum ultra-low temperature sludge drying system according to claim 1, characterized in that: Both the first and second airtight doors are connected to hydraulic drive devices.

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