Novel double-helix type vacuum heat pump sludge drying device

Abstract

The utility model discloses a novel double-spiral vacuum heat pump sludge drying device which comprises a wet sludge storage cavity, and the lower end of the wet sludge storage cavity is connected with a spiral constant feeder; the lower end of the spiral constant feeder is connected with a treatment cavity for cutting sludge into blocks, and a sealing strip spiral block cutting machine is arranged in the treatment cavity; one side of the treatment cavity is connected with a drying box group through a pipeline; a double-spiral sludge conveying belt is arranged in the drying box group; the double-helix type sludge conveying belt is used for conveying diced dry and wet sludge; one side of the drying box group is connected with a dry sludge storage room; the drying box set is connected with an air circulation device through a pipeline. The mechanism can solve the problems of low sludge drying efficiency, incomplete drying and high water content of sludge after gas residue drying.

Description

Technical Field

[0001] The utility model relates to a sludge drying device, in particular to a novel double-screw vacuum heat pump sludge drying device. Background Art

[0002] Existing sludge drying devices mostly use crawler drying, which can only dry sludge once, resulting in insufficient drying, low drying efficiency, low energy utilization, and easy clogging of sludge, which reduces the safety of the unit. It also causes the moisture content of the dried sludge to be uneven and uncontrollable. The water vapor generated by sludge drying is difficult to discharge and will return to the sludge again, further increasing the moisture content of the sludge and affecting the generated gas, which is easy to pollute the environment. The current belt sludge drying equipment has low drying efficiency and low energy utilization, and the gas is difficult to remove and deposited in the unit, affecting the moisture content of the dry sludge. Due to the uninterrupted operation of the unit, the temperature continues to rise and the operation is unstable. Utility Model Content

[0003] In view of the problems existing in the above-mentioned prior art, the utility model provides a novel double-screw vacuum heat pump sludge drying device, thereby solving the above-mentioned technical problems.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a novel double-screw vacuum heat pump sludge drying device, comprising a wet sludge storage chamber; a sludge inlet is provided at the upper end of the wet sludge storage chamber, and a sludge discharge port is provided at the lower end; the lower end of the wet sludge storage chamber is connected to a spiral quantitative feeder; the lower end of the spiral quantitative feeder is connected to a processing chamber for sludge cutting, and a sealing spiral cutting machine is provided in the processing chamber; one side of the processing chamber is connected to a drying box group through a pipeline; a double-screw sludge conveyor belt is provided in the drying box group; the double-screw sludge conveyor belt comprises a left-screw sludge conveyor belt mechanism and a right-screw sludge conveyor belt mechanism; the double-screw sludge conveyor belt is used for conveying dry and wet sludge after cutting; one side of the drying box group is connected to a dry sludge storage room; the drying box group is connected to an air circulation device through a pipeline.

[0005] Furthermore, the air circulation device includes an upper circulation pipeline for the passage of moist cold air and a lower circulation pipeline for the passage of dry hot air; an evaporator controlled by an expansion valve is arranged between the upper circulation pipeline and the lower circulation pipeline; one side of the evaporator is connected to a compressor; the compressor is used to compress the refrigerant gas of the evaporator and turn it into high-pressure and high-temperature superheated steam, which enters the drying box group along the lower circulation pipeline for heating and drying the sludge; a condenser is installed on one side of the compressor; one side of the condenser is connected to a condenser treatment tank through a pipeline.

[0006] Furthermore, a circulation fan is provided on one side of the upper circulation pipeline close to the drying box group, and the circulation fan is used to circulate the moist and cold air of the drying box group to the air circulation device.

[0007] Furthermore, a lifting plate is provided at the connection position between the lower end of the spiral quantitative feeder and the processing chamber, and the lifting plate is used to evenly and directional drop the sludge into the sealing strip spiral cutter.

[0008] Furthermore, the sealing strip spiral cutter uses toothed spiral blades to perform secondary pulverization of the sludge.

[0009] The beneficial effects of the utility model are:

[0010] 1) By adopting a double-spiral sludge conveyor belt to further cut the sludge into pieces before drying, the contact area is increased, the difficulty of the next drying step is reduced, and the original belt transmission is changed, so that the sludge enters the drying from the lower left of the unit and passes through the maximum route to achieve the purpose of full drying, and is discharged from the lower right of the unit and has a higher frequency of contact with hot air, a larger drying surface area, and more complete drying. The realization of multiple heating and double drying greatly reduces the water content of the sludge;

[0011] 2) Condenser and evaporator linkage: 40℃ humid cold air with a relative humidity of 100% is heated through the evaporator, and then passes through the compressor and the condenser again to convert the humid cold air into 80℃ dry hot air with a relative humidity of 20-30%. The humidity in the air is reduced to form a unique air cycle. At the same time, the air passes through the circulating fan to perform vacuum treatment in the unit so that the polluted gas is stored in the unit to protect the environment.

[0012] 3) The moist cold air exchanges heat through the evaporator, allowing the compressed water vapor to cool and condense back into liquid water and then be discharged into the condensate treatment tank to dry the compressed air. The low-pressure condensed liquid becomes low-pressure refrigerant steam in the evaporator, absorbing the surrounding heat, thereby cooling the compressed air. The compressor inhales the refrigerant gas from the evaporator and compresses it to become high-pressure and high-temperature superheated steam for heating and drying the sludge. The condenser condenses the high-pressure, superheated condensed steam discharged from the compressor and cools it into liquid refrigerant to take away the heat generated, so that the drying process can be carried out uninterruptedly, achieving low-temperature drying and improving the safety of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the utility model;

[0014] In the figure: 1. Wet sludge storage room, 2. Screw quantitative feeder, 3. Lifting plate, 4. Drying box group, 5. Sealing strip spiral cutter, 6. Double spiral sludge conveyor belt, 7. Circulating fan, 8. Evaporator, 9. Compressor, 10. Expansion valve, 11. Condenser, 12. Condenser treatment tank 13. Dry sludge storage room. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail through the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the scope of the utility model.

[0016] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by technicians in the technical field to which the present invention belongs. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0017] like Figure 1 As shown, a novel double-screw vacuum heat pump sludge drying device includes a wet sludge storage chamber 1; the upper end of the wet sludge storage chamber 1 is provided with a sludge inlet, and the lower end is provided with a sludge discharge port; the lower end of the wet sludge storage chamber 1 is connected to a spiral quantitative feeder 2; the lower end of the spiral quantitative feeder 2 is connected to a processing chamber for sludge cutting, and a sealing strip spiral cutting machine 5 is arranged in the processing chamber; one side of the processing chamber is connected to a drying box group 4 through a pipeline; a double-screw sludge conveyor belt 6 is arranged in the drying box group 4; the double-screw sludge conveyor belt 6 includes a left spiral sludge conveyor belt mechanism and a right spiral sludge conveyor belt mechanism. The double-screw sludge conveyor belt 6 is used for conveying dry and wet sludge after cutting; one side of the drying box group 4 is connected to a dry sludge storage room 13; the drying box group 4 is connected to an air circulation device through a pipeline.

[0018] Preferably, the air circulation device of this embodiment includes an upper circulation pipeline for the passage of moist cold air and a lower circulation pipeline for the passage of dry hot air; an evaporator 8 controlled by an expansion valve 10 is arranged between the upper circulation pipeline and the lower circulation pipeline; one side of the evaporator 8 is connected to a compressor 9; the compressor 9 is used to compress the refrigerant gas of the evaporator 8 and convert it into high-pressure and high-temperature superheated steam, which enters the drying box group 4 along the lower circulation pipeline for heating and drying the sludge; a condenser 11 is installed on one side of the compressor 9; one side of the condenser 11 is connected to a condenser treatment tank 12 through a pipeline.

[0019] Preferably, in this embodiment, a circulation fan 7 is provided on one side of the upper circulation pipeline close to the drying box group 4, and the circulation fan 7 is used to circulate the moist and cold air of the drying box group 4 to the air circulation device.

[0020] Preferably, in this embodiment, a lifting plate 3 is provided at the connection position between the lower end of the spiral quantitative feeder 2 and the processing chamber, and the lifting plate 3 is used to evenly and directional drop the sludge into the sealing strip spiral cutter 5 .

[0021] Preferably, in this embodiment, the sealing strip spiral cutter 5 uses toothed spiral blades to perform secondary pulverization of the sludge.

[0022] Working principle: The wet sludge is crushed and quantitatively extruded into strips through the spiral quantitative feeder 2. Before entering the drying box group through the lifting plate 3, the innovative toothed spiral blades are used for secondary crushing, making the later processing of the sludge easier and more efficient. The crushed sludge enters the double-screw sludge conveyor belt 6 from the lower left part of the unit, and the sludge to be dried is conveyed to the entrance of the left spiral machine of the conveyor belt through the feeding device. Then, the sludge to be dried is gradually pushed forward to a higher place in the spiral channel as the left spiral rotates, and enters the right spiral channel after reaching the highest point. The dried sludge gradually moves to a lower place. During the advancement process, the sludge is fully in contact with the high-temperature dry air, and the moisture is quickly taken away. The double-screw machine has two parallel spirals. The spiral channel increases the residence time and contact area of ​​the items in the high-temperature dry environment, thereby achieving an efficient drying effect; through the continuous cycle of the refrigeration process, a large amount of sludge can be quickly and continuously processed. At the same time, the sludge is low in and low out, and the transportation is convenient; to a certain extent, it can make more reasonable use of space, and it may achieve a greater processing capacity in the same space.

[0023] The evaporator 8 controlled by the expansion valve 10 is throttled and depressurized to increase the temperature and reduce the moisture content of the sludge. The humid cold air exchanges heat through the evaporator 8 so that most of the water vapor in the middle of the compression is cooled and condensed into liquid water and discharged to the condensed water treatment tank 12, thereby drying the compressed air.

[0024] The low-pressure condensed liquid is transformed into low-pressure refrigerant steam in the evaporator 8, and absorbs the surrounding heat during the phase change process, thereby cooling the compressed air. The compressor 9 sucks the refrigerant gas from the evaporator 8 and compresses it to turn it into high-pressure and high-temperature superheated steam to heat and dry the sludge. At the same time, the sludge is passed through the double-screw sludge conveyor belt 6 to enter the drying process at the lower left and pass through the maximum route to achieve the purpose of full drying and be discharged from the lower right of the unit. The condenser 11 condenses the high-pressure and superheated condensed steam discharged from the compressor 9 and cools it into liquid refrigerant to take away the generated heat, so that the drying process can be carried out uninterruptedly, achieving low-temperature drying and improving the safety of the unit.

[0025] Through the linkage of the evaporator 8 and the condenser 11, as well as the special double-spiral sludge conveyor belt 6 and the sealing structure, the sludge is heated multiple times and dried twice, which fully dries the sludge and speeds up the drying rate of the sludge. The condenser 11 and the evaporator 8 operate simultaneously, and the humid cold air with a relative humidity of 100% at 40°C is heated through the evaporator, passes through the compressor, and then passes through the condenser 11 again to convert the humid cold air into dry hot air with a relative humidity of 20-30% at 80°C, thereby reducing the humidity in the air and forming a unique air cycle to store polluted gases in the unit to protect the environment. The water vapor is condensed into condensed water and then evaporated through the evaporator 8. The condensed water is discharged from the sewage pool, and at the same time, the evaporated air passes through the circulating fan 7 to exchange heat with the return air of the heat pump. After the outlet air temperature is increased, it enters the condenser 11, and after being heated up, it becomes hot dry air and enters the drying box group 4 for circulation treatment. The completely dried sludge is stored in the dry sludge storage room 13, and the excess condensed water produced by condensation and evaporation is cooled and recovered through the biological deodorization tank to meet the national emission standards and effectively reduce pollution.

[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent substitution or improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A new type of double-screw vacuum heat pump sludge drying device, characterized in that: The invention comprises a wet sludge storage chamber (1); a sludge inlet is arranged at the upper end of the wet sludge storage chamber (1), and a sludge discharge port is arranged at the lower end; the lower end of the wet sludge storage chamber (1) is connected to a spiral quantitative feeder (2); the lower end of the spiral quantitative feeder (2) is connected to a processing chamber for sludge cutting, and a sealing spiral cutting machine (5) is arranged in the processing chamber; one side of the processing chamber is connected to a drying box group (4) through a pipeline; a double spiral sludge conveyor belt (6) is arranged in the drying box group (4); the double spiral sludge conveyor belt (6) comprises a left spiral sludge conveyor belt mechanism and a right spiral sludge conveyor belt mechanism; the double spiral sludge conveyor belt (6) is used for conveying dry and wet sludge after cutting; one side of the drying box group (4) is connected to a dry sludge storage room (13); the drying box group (4) is connected to an air circulation device through a pipeline.

2. A novel double-screw vacuum heat pump sludge drying device according to claim 1, characterized in that: The air circulation device comprises an upper circulation pipeline for moist cold air to pass through and a lower circulation pipeline for dry hot air to pass through; an evaporator (8) controlled by an expansion valve (10) is arranged between the upper circulation pipeline and the lower circulation pipeline; one side of the evaporator (8) is connected to a compressor (9); the compressor (9) is used to compress the refrigerant gas of the evaporator (8) and convert it into high-pressure and high-temperature superheated steam, which enters the drying box group (4) along the lower circulation pipeline to heat and dry the sludge; a condenser (11) is installed on one side of the compressor (9); one side of the condenser (11) is connected to a condenser treatment tank (12) through a pipeline.

3. A novel double-screw vacuum heat pump sludge drying device according to claim 2, characterized in that: A circulation fan (7) is provided on one side of the upper circulation pipeline close to the drying box group (4), and the circulation fan (7) is used to circulate the wet and cold air of the drying box group (4) into the air circulation device.

4. A novel double-screw vacuum heat pump sludge drying device according to claim 1, characterized in that: A lifting plate (3) is provided at the connection position between the lower end of the spiral quantitative feeder (2) and the processing chamber, and the lifting plate (3) is used to evenly and directional drop the sludge into the sealing strip spiral cutter (5).

5. A novel double-screw vacuum heat pump sludge drying device according to claim 1, characterized in that: The sealing strip spiral cutter (5) uses toothed spiral blades to perform secondary pulverization of the sludge.

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