Sludge hydrothermal pretreatment device

Abstract

The invention discloses a sludge hydrothermal pretreatment device which comprises an integrated tank, the integrated tank is fixedly installed on the ground and connected with a high-temperature steam input pipe, the lower portion of the integrated tank is provided with a reaction area, the reaction area is divided into a plurality of partition areas, the upper portion of the integrated tank is provided with a flash evaporation area, and at least two stages of flash evaporation tanks are arranged in the flash evaporation area. Other areas at the upper part of the integrated tank are heating areas, the heating areas are communicated with the reaction areas, stirring pieces are rotatably mounted in the reaction areas, the stirring pieces are connected with stirring drivers, connecting pipes are mounted between the discharge ends of the reaction areas and the feed end of the flash evaporation area, and the connecting pipes are provided with control valves. According to the invention, the plurality of partition zones are arranged, so that the sludge in the partition zones enters the flash tank zone by zone, and the sludge in the other partition zones continuously reacts, thereby reducing the time for the flash tank to wait for the reaction of the sludge in the reaction zone and improving the working efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of sludge treatment and relates to a sludge hydrothermal pretreatment device. Background Art

[0002] Sludge treatment includes incineration, landfill and agricultural utilization. Sludge is dehydrated as needed in different treatment methods. Sludge hydrothermal dehydration treatment includes sludge hydrothermal pretreatment and hydrothermal sludge mechanical dehydration treatment. Sludge hydrothermal pretreatment refers to placing the sludge in a closed container and heating it to a certain temperature for hydrolysis reaction. After the hydrolysis reaction, flash evaporation is performed to remove a certain amount of water. The remaining sludge is then mechanically dehydrated, i.e. centrifugal dehydration by centrifuge.

[0003] However, in the process of hydrothermal pretreatment, high-temperature steam boilers, hydrolysis reactors, and flash tanks are required, which require a large floor space. In the patent document with publication number CN220495617U, a flash condensation device is disclosed, which separates the material chamber, spray chamber, and steam flow chamber inside the reactor, integrates the flash tank, spray tower, and steam flow pipeline, reduces the space occupied by the gas-water separation equipment, and avoids the complicated installation process. However, this technical solution has low production efficiency and is not suitable for sludge hydrothermal pretreatment process. Summary of the invention

[0004] In view of the above problems, the present invention proposes a sludge hydrothermal pretreatment device, which well solves the problems in the prior art.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] A sludge hydrothermal pretreatment device, comprising:

[0007] An integrated tank, which is fixedly mounted on the ground and is connected to a high-temperature steam input pipe;

[0008] A reaction zone, the reaction zone is arranged at the lower part of the integrated tank, and the reaction zone is divided into a plurality of sub-zones;

[0009] A flash zone, wherein the flash zone is arranged at the upper part of the integrated tank, wherein at least two stages of flash tanks are arranged in the flash zone, and the other areas at the upper part of the integrated tank are temperature rising zones, and the temperature rising zones are connected to the reaction zone;

[0010] A stirring member, the stirring member is rotatably mounted in the reaction zone, and the stirring member is connected to a stirring drive;

[0011] A connecting pipe is used to connect the discharge end of the reaction zone with the feed end of the flash zone, and the connecting pipe is provided with a control valve.

[0012] Optionally, the middle part of the integrated tank is set as a driving zone, a center wheel is rotatably installed in the driving zone, the center wheel is meshed with multiple dividing wheels, the dividing wheels are fixedly connected to the stirring element, the center wheel is connected to the stirring drive, and a connecting pipe is set in the driving zone for connecting the reaction zone and the heating zone.

[0013] Optionally, the stirring member includes a hollow stirring shaft, a plurality of stirring rods are installed in an array on the outer side of the stirring shaft, a driving shaft is slidably keyed inside the stirring shaft, the upper end of the driving shaft is fixedly connected to the dividing wheel, and the upper end of the dividing wheel is connected to a clutch drive.

[0014] Optionally, the stirring rod is a hollow tube connected to the stirring shaft, and a plurality of one-way valves penetrating the side walls of the stirring rods are installed in the axial array of the stirring rods. An air supply pipe sleeved on the stirring shaft is fixedly installed at the lower end of the driving area, and a sealed bearing is arranged between the air supply pipe and the stirring shaft. The air supply pipe is connected to the high-temperature steam input pipe through a pipeline.

[0015] Optionally, the stirring drive is installed at the upper end of the flash zone, and the clutch drive is a cylinder.

[0016] Optionally, a negative pressure pump is connected to the upper end of the flash evaporation zone, an input end of the negative pressure pump is connected to the flash evaporation zone, an air pressure sensor is arranged in the flash evaporation zone, and the air pressure sensor is connected to the negative pressure pump signal.

[0017] Optionally, the one-way valve includes a mounting tube, a retaining ring is fixedly installed inside the mounting tube, a retaining ball is provided at one end of the retaining ring close to the outer side of the stirring rod, the retaining ball is fixedly connected to a return spring, and the return spring is fixedly connected to the mounting tube after passing through the retaining ring.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. On the one hand, by setting up multiple sub-zones, the sludge in the sub-zones enters the flash tank one by one, while the sludge in other sub-zones continues to react, reducing the time the flash tank waits for the sludge in the reaction zone to react, thereby improving work efficiency. At the same time, by setting up the heating zone in the integrated tank, the flash zone is kept at a higher temperature, which facilitates better evaporation when the sludge enters the flash tank, thereby improving the utilization rate of high-temperature steam;

[0020] 2. By setting up the air supply pipe, the stirring rod part can release high-temperature steam. The stirring rod is located in the sludge, which can better send the high-temperature steam into the sludge at the bottom, thereby improving the heating efficiency of the sludge;

[0021] 3. By setting up a negative pressure pump and an air pressure sensor, the flash zone is kept in a suitable low pressure state through the negative pressure pump, reducing the impact of pressure fluctuations in the flash tank caused by temperature changes in the heating zone. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present invention;

[0023] Figure 2 is a schematic structural diagram of a driving area portion of an embodiment of the present invention;

[0024] Figure 3 is a schematic structural diagram of a stirring member portion of an embodiment of the present invention;

[0025] Figure 4 It is a schematic structural diagram of the one-way valve part of an embodiment of the present invention.

[0026] Figure numerals: 1. integrated tank; 11. reaction zone; 12. flash zone; 121. flash tank; 13. heating zone; 14. drive zone; 141. center wheel; 142. dividing wheel; 143. connecting pipe; 2. stirring element; 201. stirring shaft; 21. one-way valve; 211. mounting pipe; 212. retaining ring; 213. retaining ball; 214. return spring; 22. stirring rod; 23. driving shaft; 24. clutch drive; 25. air supply pipe; 3. connecting pipe; 4. negative pressure pump. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] See also Figure 1-Figure 2 , is a sludge hydrothermal pretreatment device disclosed in an embodiment of the present invention, comprising an integrated tank 1, the integrated tank 1 is fixedly installed on the ground, the integrated tank 1 is connected to a high-temperature steam input pipe, the lower part of the integrated tank 1 is set as a reaction zone 11, the reaction zone 11 is divided into a plurality of sub-zones, the upper part of the integrated tank 1 is provided with a flash zone 12, at least two-stage flash tanks 121 are provided in the flash zone 12, the other areas on the upper part of the integrated tank 1 are heating zones 13, the heating zone 13 is connected to the reaction zone 11, a stirring member 2 is rotatably installed in the reaction zone 11, the stirring member 2 is connected to a stirring drive, a connecting pipe 3 is installed between the discharge end of the reaction zone 11 and the feed end of the flash zone 12, and the connecting pipe 3 is provided with a control valve.

[0029] Specifically, the flash zone 12 and the reaction zone 11 are arranged in an integrated tank 1. After the sludge enters the reaction zone 11, it is heated and pressurized by high-temperature steam and stirred by the stirring element 2. After a period of reaction, it enters the flash tank 121 through the connecting pipe 3 for at least two-stage flash dehydration. The temperature rising zone 13 is connected to the reaction zone 11, and part of the high-temperature steam enters the temperature rising zone 13 to heat the flash tank 121, so that the flash tank 121 is kept at a high temperature to facilitate the evaporation of water vapor.

[0030] In this way, on the one hand, by setting up multiple sub-zones, the sludge in the sub-zones enters the flash tank 121 one by one, and at the same time, the sludge in other sub-zones continues to react, thereby reducing the time for the flash tank 121 to wait for the sludge in the reaction zone 11 to react, thereby improving work efficiency. At the same time, by setting up the heating zone 13 in the integrated tank 1, the flash zone 12 maintains a relatively high temperature, so that when the sludge enters the flash tank 121, it is easier to evaporate and the utilization rate of the high-temperature steam is improved.

[0031] In some feasible ways, the integrated tank 1 is cylindrical, and the integrated tank 1 is evenly divided into three sub-zones. A connecting pipe 3 is installed below the sub-zone. The three connecting pipes 3 are connected to the same main pipe and then connected to the first-level flash tank 121. The connecting pipe 3 is provided with a control valve and a delivery pump to control the opening and closing of the corresponding pipeline and the mud delivery. The main pipe is provided with a corresponding pressure reducing valve, that is, the flash tank 121 is provided with a spray device, etc., which are all common equipment for the flash process and are not repeated here. The first-level flash tank 121 is connected to the second-level flash tank 121 through a pipeline, and the second-level flash tank 121 is connected to the heat exchanger and the centrifuge through a pipeline. After the two flash tanks 121 are installed on the upper part of the integrated tank 1, the area between the inner side of the upper part of the integrated tank 1 and the flash tank 121 is the heating zone 13, and the heating zone 13 is connected to the reaction zone 11. The upper end of the heating zone 13 is provided with a steam exhaust pipe to allow the steam to enter the corresponding cooling device for water circulation. The temperature rising zone 13 uses steam to keep the temperature of the flash tank 121, which is beneficial to keep the high temperature of the mud after entering the low-pressure space of the flash tank 121, thereby improving the flash evaporation efficiency.

[0032] As a specific implementation of the sludge hydrothermal pretreatment device provided in the application, please refer to Figure 2 The middle part of the integrated tank 1 is set as a driving area 14, and a center wheel 141 is rotatably installed in the driving area 14. The center wheel 141 is meshed with multiple dividing wheels 142. The dividing wheels 142 are fixedly connected to the stirring member 2. The center wheel 141 is connected to the stirring drive. A connecting pipe 143 is set in the driving area 14 for connecting the reaction zone 11 with the heating zone 13.

[0033] In general, the central wheel 141 and the dividing wheel 142 are provided to control the plurality of stirring elements 2 .

[0034] For further information, see Figure 3The stirring member 2 includes a hollow stirring shaft 201, and a plurality of stirring rods 22 are installed in an array on the outer side of the stirring shaft 201. A driving shaft 23 is slidably keyed inside the stirring shaft 201. The upper end of the driving shaft 23 is fixedly connected to the dividing wheel 142, and the upper end of the dividing wheel 142 is connected to a clutch drive 24.

[0035] It should be understood that the multiple division zones do not work synchronously. By providing the hollow stirring shaft 201 and the slidable driving shaft 23, it is convenient to disengage the division wheel 142 when stirring is not required in some division zones.

[0036] Furthermore, the stirring rod 22 is a hollow tube connected to the stirring shaft 201. The stirring rod 22 is equipped with a plurality of one-way valves 21 penetrating the side wall of the stirring rod 22 in an axial array. An air supply pipe 25 sleeved on the stirring shaft 201 is fixedly installed at the lower end of the driving area 14. A sealed bearing is arranged between the air supply pipe 25 and the stirring shaft 201. The air supply pipe 25 is connected to the high-temperature steam input pipe through a pipeline.

[0037] It should be understood that by providing the air supply pipe 25, the stirring rod 22 can release high-temperature steam. The stirring rod 22 is located in the sludge, and the high-temperature steam can be better delivered to the sludge at the bottom, thereby improving the heating efficiency of the sludge.

[0038] In some feasible modes, the air supply pipe 25 is fixedly connected to the upper end of the reaction zone 11 by bolts, a sealed bearing is arranged on the air supply pipe 25, the upper end of the stirring shaft 201 is mounted on the inner ring of the sealed bearing, the lower end of the stirring shaft 201 is rotatably mounted on the bottom of the reaction zone 11, a keyway is arranged on the inner side of the lower end of the stirring shaft 201, and a corresponding key is arranged on the lower end of the driving shaft 23, and the length of the key and the keyway should be such that the driving shaft 23 does not disengage during the sliding process. Figure 4 The one-way valve 21 includes a mounting tube 211, a retaining ring 212 is fixedly mounted in the mounting tube 211, a retaining ball 213 is arranged at one end of the retaining ring 212 close to the outside of the stirring rod 22, the retaining ball 213 is fixedly connected to a return spring 214, and the return spring 214 is fixedly connected to the mounting tube 211 after passing through the retaining ring 212. By arranging the retaining ball 213 on the outside of the retaining ring 212, the possibility of mud retaining ring 212 under high pressure is reduced. At the same time, auxiliary plates are arranged on both sides of the stirring rod 22 on the one-way valve 21. During the rotation process, the stirring rod 22 passes through the mud, and a hollow area is formed in the auxiliary plate, which is convenient for the discharge of steam and reduces the possibility of mud entering the stirring rod 22.

[0039] Further, the stirring drive is installed at the upper end of the flash zone 12, and the clutch drive 24 is a cylinder.

[0040] It should be understood that the drive zone 14 is arranged in the middle of the integrated tank 1 and is in a high temperature state for a long time under the action of high-temperature steam. By arranging the stirring drive at the upper end of the flash zone 12, the impact of high temperature on the stirring drive and other devices is reduced, thereby improving the service life.

[0041] In some feasible embodiments, the center wheel 141 is meshed with a driving gear, and the driving gear is connected to a connecting shaft, which passes through the heating zone 13 and is connected to the stirring drive. The clutch drive 24 is installed at the bottom of the dividing wheel 142. When it is necessary to disengage, the dividing wheel 142 is lifted by the cylinder. In order to facilitate the resetting of the dividing wheel 142, the lower end of the gear teeth of the dividing wheel 142 is wedge-shaped.

[0042] As another specific embodiment of the sludge hydrothermal pretreatment device provided in the application, please refer to Figure 1 The upper end of the flash zone 12 is connected to a negative pressure pump 4, the input end of the negative pressure pump 4 is connected to the flash zone 12, and an air pressure sensor is arranged in the flash zone 12, and the air pressure sensor is connected to the negative pressure pump 4 signal.

[0043] In combination with specific usage scenarios, a negative pressure pump 4 and an air pressure sensor are provided to maintain the flash zone 12 in a suitable low pressure state through the negative pressure pump 4, thereby reducing the impact of pressure fluctuations in the flash tank 121 caused by temperature changes in the heating zone 13.

[0044] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A sludge hydrothermal pretreatment device, characterized in that: include: An integrated tank, which is fixedly mounted on the ground and is connected to a high-temperature steam input pipe; A reaction zone, the reaction zone is arranged at the lower part of the integrated tank, and the reaction zone is divided into a plurality of sub-zones; A flash zone, wherein the flash zone is arranged at the upper part of the integrated tank, wherein at least two stages of flash tanks are arranged in the flash zone, and the other areas at the upper part of the integrated tank are temperature rising zones, and the temperature rising zones are connected to the reaction zone; A stirring member, the stirring member is rotatably mounted in the reaction zone, and the stirring member is connected to a stirring drive; A connecting pipe is used to connect the discharge end of the reaction zone with the feed end of the flash zone, and the connecting pipe is provided with a control valve.

2. A sludge hydrothermal pretreatment device according to claim 1, characterized in that: The middle part of the integrated tank is set as a driving area, and a center wheel is rotatably installed in the driving area. The center wheel is engaged with a plurality of dividing wheels, and the dividing wheels are fixedly connected to the stirring member. The center wheel is connected to the stirring drive, and a connecting pipe is set in the driving area for connecting the reaction zone and the heating zone.

3. A sludge hydrothermal pretreatment device according to claim 2, characterized in that: The stirring member comprises a hollow stirring shaft, a plurality of stirring rods are installed in an array on the outer side of the stirring shaft, a driving shaft is slidably keyed inside the stirring shaft, the upper end of the driving shaft is fixedly connected to the dividing wheel, and the upper end of the dividing wheel is connected to a clutch drive.

4. A sludge hydrothermal pretreatment device according to claim 3, characterized in that: The stirring rod is a hollow tube connected to the stirring shaft. The stirring rod axial array is equipped with multiple one-way valves penetrating the side walls of the stirring rod. The lower end of the driving area is fixedly equipped with an air supply pipe sleeved on the stirring shaft. A sealed bearing is arranged between the air supply pipe and the stirring shaft. The air supply pipe is connected to the high-temperature steam input pipe through a pipeline.

5. A sludge hydrothermal pretreatment device according to claim 4, characterized in that: The stirring drive is installed at the upper end of the flash zone, and the clutch drive is a cylinder.

6. A sludge hydrothermal pretreatment device according to claim 1, characterized in that: The upper end of the flash evaporation zone is connected to a negative pressure pump, the input end of the negative pressure pump is connected to the flash evaporation zone, an air pressure sensor is arranged in the flash evaporation zone, and the air pressure sensor is connected to the negative pressure pump signal.

7. A sludge hydrothermal pretreatment device according to claim 4, characterized in that: The one-way valve includes a mounting tube, a retaining ring is fixedly mounted inside the mounting tube, a retaining ball is arranged at one end of the retaining ring close to the outer side of the stirring rod, the retaining ball is fixedly connected to a return spring, and the return spring is fixedly connected to the mounting tube after passing through the retaining ring.

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