Sludge hydrothermal pretreatment device

Abstract

The application discloses a sludge hydrothermal pretreatment device, which comprises an integrated tank, wherein the integrated tank is fixedly installed on the ground, the integrated tank is connected with a high-temperature steam input pipe, the lower part of the integrated tank is arranged as a reaction zone, the reaction zone is divided into multiple sub-zones, the upper part of the integrated tank is arranged as a flash evaporation zone, at least two flash evaporation tanks are arranged in the flash evaporation zone, the other regions of the upper part of the integrated tank are arranged as temperature rising zones, the temperature rising zones are communicated with the reaction zone, stirring pieces are rotatably installed in the reaction zone, the stirring pieces are connected with stirring drives, a connecting pipe is installed between the discharge end of the reaction zone and the feeding end of the flash evaporation zone, and the connecting pipe is provided with a control valve. Through the arrangement of the multiple sub-zones, the sludge in the sub-zones enters the flash evaporation tanks zone by zone, the sludge in other sub-zones continues to react, the time for the sludge in the flash evaporation tanks to wait for the reaction in the reaction zone is reduced, and the working efficiency is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of sludge treatment, and relates to a sludge hydrothermal pretreatment device. BACKGROUND

[0002] In the treatment of sludge, including incineration, landfill and agricultural utilization, etc., the sludge is dewatered as needed in different ways. The sludge hydrothermal dewatering treatment includes sludge hydrothermal pretreatment and mechanical dewatering treatment of hydrothermal sludge, wherein the sludge hydrothermal pretreatment refers to placing the sludge in a sealed container, heating to a certain temperature to carry out a hydrolysis reaction, and then carrying out flash evaporation to remove a certain amount of water. Then the remaining sludge is mechanically dewatered, i.e. centrifugal dewatering.

[0003] However, in the process of hydrothermal pretreatment, high-temperature steam boilers, hydrolysis reactors and flash tanks are needed, which requires a large floor area. In the patent document with the publication number CN220495617U, a flash condensing device is disclosed, which separates the material chamber, the spraying chamber and the steam flow chamber in the reactor, integrates the flash tank, the spraying tower and the steam flow pipeline, reduces the area occupied by the gas-water separation equipment, and avoids the complex installation process. However, the technical solution has low production efficiency and is not suitable for sludge hydrothermal pretreatment process. SUMMARY

[0004] In view of the above problems, the application provides a sludge hydrothermal pretreatment device, which solves the problems in the prior art.

[0005] To achieve the above purpose, the technical scheme adopted by the application is as follows:

[0006] A sludge hydrothermal pretreatment device, comprising:

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

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

[0009] A flash evaporation zone is arranged at the upper part of the integrated tank, at least two flash evaporation tanks are arranged in the flash evaporation zone, other regions of the upper part of the integrated tank are warming-up zones, and the warming-up zones are in communication with the reaction zone;

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

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

[0012] Optionally, the central part of the integrated tank is set as a driving zone, a central wheel is rotatably installed in the driving zone, the central wheel meshes with multiple position wheels, the position wheels are fixedly connected to the stirring element, the central wheel is connected to a stirring drive, and a connecting pipe is provided in the driving zone to connect the reaction zone and the heating zone.

[0013] Optionally, the stirring component includes a hollow stirring shaft, with multiple stirring rods arrayed on the outer side of the stirring shaft, and a drive shaft slidably connected to the stirring shaft. The upper end of the drive shaft is fixedly connected to the dividing wheel, and a clutch drive is connected to the upper end of the dividing wheel.

[0014] Optionally, the stirring rod is a hollow tube communicating with the stirring shaft. Multiple one-way valves penetrating the side wall of the stirring rod are axially arrayed on the stirring rod. An air supply pipe sleeved on the stirring shaft is fixedly installed at the lower end of the drive area. A sealed bearing is provided between the air supply pipe and the stirring shaft. The air supply pipe is connected to a 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 zone, the input end of the negative pressure pump is connected to the flash zone, and a pressure sensor is installed in the flash zone, the pressure sensor being signal-connected to the negative pressure pump.

[0017] Optionally, the one-way valve includes an installation tube, a retaining ring is fixedly installed inside the installation tube, a retaining ball is provided at one end of the retaining ring near the outside of the stirring rod, a return spring is fixedly connected to the retaining ball, and the return spring passes through the retaining ring and is fixedly connected to the installation tube.

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

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

[0020] 2. By setting up an air supply pipe, the stirring rod can release high-temperature steam. The stirring rod is located inside the sludge, which can better deliver the high-temperature steam into the bottom layer of sludge, thus improving the heating efficiency of the sludge.

[0021] 3. By setting up a negative pressure pump and a pressure sensor, the negative pressure pump maintains a suitable low pressure in the flash zone, reducing the impact of pressure fluctuations in the flash tank caused by temperature changes in the heating zone. Attached Figure Description

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

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

[0024] Figure 3 This is a schematic diagram of the structure of the stirring component in an embodiment of the present invention;

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

[0026] Reference numerals: 1. Integrated tank; 11. Reaction zone; 12. Flash zone; 121. Flash tank; 13. Heating zone; 14. Drive zone; 141. Central wheel; 142. Dividing wheel; 143. Connecting pipe; 2. Stirring component; 201. Stirring shaft; 21. Check valve; 211. Mounting pipe; 212. Retaining ring; 213. Retaining ball; 214. Return spring; 22. Stirring rod; 23. Drive shaft; 24. Clutch drive; 25. Gas supply pipe; 3. Connecting pipe; 4. Negative pressure pump. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Please see Figures 1-2 This invention discloses a sludge hydrothermal pretreatment device, comprising an integrated tank 1, which is fixedly installed on the ground and connected to a high-temperature steam input pipe. The lower part of the integrated tank 1 is configured as a reaction zone 11, which is divided into multiple sub-zones. The upper part of the integrated tank 1 is configured as a flash evaporation zone 12, which contains at least two flash evaporation tanks 121. The other areas of the upper part of the integrated tank 1 are heating zones 13, which are connected to the reaction zone 11. A stirring element 2 is rotatably installed in the reaction zone 11 and is connected to a stirring drive. A connecting pipe 3 is installed between the discharge end of the reaction zone 11 and the inlet end of the flash evaporation zone 12, and the connecting pipe 3 is equipped with a control valve.

[0029] Specifically, the flash zone 12 and the reaction zone 11 are located 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 agitator 2. After reacting for a period of time, it enters the flash tank 121 through the connecting pipe 3 for at least two stages of flash dehydration. The heating zone 13 is connected to the reaction zone 11, and some of the high-temperature steam enters the heating zone 13 to heat the flash tank 121, keeping the flash tank 121 at a high temperature to facilitate the evaporation of water vapor.

[0030] In this way, by setting up multiple partitioned zones, the sludge in each partitioned zone enters the flash tank 121 in turn, while the sludge in other partitioned zones continues to react, reducing the time that the flash tank 121 waits for the sludge in the reaction zone 11 to react and improving work efficiency. At the same time, by setting up the heating zone 13 in the integrated tank 1, the flash zone 12 is kept at a high temperature, which facilitates better evaporation when the sludge enters the flash tank 121 and improves the utilization rate of high-temperature steam.

[0031] In some feasible configurations, the integrated tank 1 is cylindrical, divided into three sub-zones. Connecting pipes 3 are installed below each sub-zone, and these three pipes 3 are connected to a common main pipe leading to the first-stage flash tank 121. Control valves and delivery pumps are installed on the connecting pipes 3 to control the opening and closing of the corresponding pipes and the conveying of slurry. A pressure-reducing valve is installed on the main pipe, and a spray device is installed inside the flash tank 121. These are all common equipment in flash evaporation processes and will not be elaborated further here. The first-stage flash tank 121 is connected to the second-stage flash tank 121 via pipes. The second-stage flash tank 121 is connected to a heat exchanger and a centrifuge via pipes. After the two flash tanks 121 are installed on top of the integrated tank 1, the area between the upper inner side of the integrated tank 1 and the flash tanks 121 is the heating zone 13. The heating zone 13 is connected to the reaction zone 11, and a steam exhaust pipe is installed at the upper end of the heating zone 13, allowing steam to enter the corresponding cooling device for water circulation. The heating zone 13 uses steam to maintain the temperature of the flash tank 121, which helps to keep the slurry at a high temperature after it enters the low-pressure space of the flash tank 121, thereby improving the flash efficiency.

[0032] As one specific embodiment of the sludge hydrothermal pretreatment device provided in the application, please refer to Figure 2 The central part of the integrated tank 1 is set as the driving zone 14. A central wheel 141 is rotatably installed in the driving zone 14. The central wheel 141 is engaged with multiple dividing wheels 142. The dividing wheels 142 are fixedly connected to the stirring component 2. The central wheel 141 is connected to the stirring drive. A connecting pipe 143 is provided in the driving zone 14 to connect the reaction zone 11 and the heating zone 13.

[0033] Overall, multiple mixing components 2 are controlled by setting the central wheel 141 and the dividing wheel 142.

[0034] Further, please refer to Figure 3The stirring component 2 includes a hollow stirring shaft 201. Multiple stirring rods 22 are arrayed on the outer side of the stirring shaft 201. A drive shaft 23 is slidably connected inside the stirring shaft 201. The upper end of the drive shaft 23 is fixedly connected to the dividing wheel 142. A clutch drive 24 is connected to the upper end of the dividing wheel 142.

[0035] It should be understood that the operation of the multiple subdivision zones is not synchronized. By setting the hollow stirring shaft 201 and the slidable drive shaft 23, it is convenient to disengage the subdivision wheel 142 when some subdivision zones do not need to be stirred.

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

[0037] It should be understood that by setting up the air supply pipe 25, the stirring rod 22 can release high-temperature steam. The stirring rod 22 is located inside the sludge, which can better deliver the high-temperature steam into the bottom layer of sludge, thereby improving the heating efficiency of the sludge.

[0038] In some feasible embodiments, the gas supply pipe 25 is bolted to the upper end of the reaction zone 11. A sealed bearing is mounted on the gas supply pipe 25. The upper end of the stirring shaft 201 is mounted on the inner ring of the sealed bearing, and the lower end of the stirring shaft 201 is rotatably mounted to the bottom of the reaction zone 11. A keyway is provided on the inner side of the lower end of the stirring shaft 201, and a corresponding key is provided on the lower end of the drive shaft 23. The length of the key and the keyway should ensure that the drive shaft 23 does not disengage during sliding. Please refer to [link / reference]. Figure 4 The one-way valve 21 includes an installation pipe 211, within which a retaining ring 212 is fixedly installed. A retaining ball 213 is located at one end of the retaining ring 212 near the outer side of the stirring rod 22. A return spring 214 is fixedly connected to the retaining ball 213, passing through the retaining ring 212 and then fixedly connected to the installation pipe 211. By positioning the retaining ball 213 outside the retaining ring 212, the possibility of mud entering the retaining ring 212 under high pressure is reduced. Simultaneously, auxiliary plates are provided on both sides of the stirring rod 22 on the one-way valve 21. During rotation, the stirring rod 22 moves across the mud, creating a hollow area within the auxiliary plates, facilitating steam discharge and reducing the possibility of mud entering the stirring rod 22.

[0039] Furthermore, 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 located 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 setting 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, and the service life is improved.

[0041] In some feasible configurations, the central wheel 141 is engaged with a drive gear, which is connected to a connecting shaft that passes through the heating zone 13 and is then connected to the stirring drive. The clutch drive 24 is installed at the bottom of the dividing wheel 142. When disengagement is required, the dividing wheel 142 is lifted by a cylinder. To facilitate the reset of the dividing wheel 142, the lower end of the 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 A negative pressure pump 4 is connected to the upper end of the flash zone 12. The input end of the negative pressure pump 4 is connected to the flash zone 12. A pressure sensor is installed in the flash zone 12 and is connected to the negative pressure pump 4.

[0043] Based on specific usage scenarios, by setting up a negative pressure pump 4 and a pressure sensor, the negative pressure pump 4 maintains a suitable low pressure state in the flash evaporation zone 12, 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 foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sludge hydrothermal pretreatment device, characterized in that, include: An integrated tank, which is fixedly installed on the ground and connected to a high-temperature steam input pipe; The reaction zone is located at the lower part of the integrated tank and is divided into multiple sub-zones; A flash zone is provided on the upper part of the integrated tank. At least two flash tanks are provided in the flash zone. The other areas on the upper part of the integrated tank are heating zones, which are connected to the reaction zone. A stirring element is rotatably mounted within the reaction zone, and the stirring element is connected to a stirring drive. A connecting pipe is used to connect the discharge end of the reaction zone to the feed end of the flash zone, and the connecting pipe is equipped with a control valve; The central part of the integrated tank is set as a drive zone, and a central wheel is rotatably installed in the drive zone. The central wheel meshes with multiple position wheels, and the position wheels are fixedly connected to the stirring element. The central wheel is connected to a stirring drive. A connecting pipe is provided in the drive zone to connect the reaction zone and the heating zone. The stirring component includes a hollow stirring shaft, with multiple stirring rods arrayed on the outer side of the stirring shaft. A drive shaft is slidably connected inside the stirring shaft, and the upper end of the drive shaft is fixedly connected to the dividing wheel. A clutch drive is connected to the upper end of the dividing wheel.

2. The sludge hydrothermal pretreatment device according to claim 1, characterized in that: The stirring rod is a hollow tube connected to the stirring shaft. Multiple one-way valves are axially arrayed on the stirring rod and penetrate the side wall of the stirring rod. An air supply pipe is fixedly installed at the lower end of the drive area and sleeved on the stirring shaft. A sealed bearing is provided between the air supply pipe and the stirring shaft. The air supply pipe is connected to a high-temperature steam input pipe through a pipeline.

3. The sludge hydrothermal pretreatment device according to claim 2, characterized in that: The stirring drive is installed at the upper end of the flash zone, and the clutch drive is a cylinder.

4. The sludge hydrothermal pretreatment device according to claim 1, characterized in that: A negative pressure pump is connected to the upper end of the flash evaporation zone. The input end of the negative pressure pump is connected to the flash evaporation zone. A pressure sensor is installed in the flash evaporation zone and is connected to the negative pressure pump.

5. The sludge hydrothermal pretreatment device according to claim 2, characterized in that: The one-way valve includes an installation tube, in which a retaining ring is fixedly installed. A retaining ball is provided at one end of the retaining ring near the outside of the stirring rod. A return spring is fixedly connected to the retaining ball. The return spring passes through the retaining ring and is fixedly connected to the installation tube.

Images