Sludge low-temperature acidolysis device

Abstract

The utility model discloses a sludge low-temperature acidolysis device which comprises a dosing unit and a PLC (programmable logic controller), a reaction unit is arranged on one side of the dosing unit, a double-pipe heat exchanger is arranged on one side of the reaction unit, and a storage unit is arranged on one side of the double-pipe heat exchanger. Sulfuric acid can be added into sludge in the hydrolysis tank through the medicine storage tank and the electromagnetic flow pump, so that the sulfuric acid reacts with the sludge, the pH value of the sludge is reduced to 5, hydrolysis of organic molecules in the sludge and dissolution of cell membranes are promoted, bound water in cells can be released to become free water easy to remove, and the sludge can be recycled. The sludge dewatering performance is effectively improved, meanwhile, by controlling the temperature in the hydrolysis tank, some side reactions generated by high-temperature reactions can be effectively avoided, needed heating energy is correspondingly reduced, consumption is greatly reduced, the sludge can be cooled through the double-pipe heat exchanger, later treatment is facilitated, and the sludge dewatering efficiency is improved. Meanwhile, the storage unit can be used for well storing the acidolysis sludge, so that later sludge dewatering operation is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of sludge treatment, in particular to a sludge low-temperature acid hydrolysis device. Background Art

[0002] Urban sewage sludge is produced by urban sewage treatment plants after sewage treatment and purification at all levels. The sludge is mainly composed of organic matter, inorganic matter and water. After the sludge moisture content drops to 80%, it is difficult to rely on traditional mechanical dehydrators for further dehydration. Reducing the moisture content of sludge is the basis for achieving sludge reduction and harmlessness, and it is also a key step.

[0003] When dehydrating sludge, thermal drying is usually used to evaporate the water. Generally, the sludge is subjected to thermal hydrolysis and flash evaporation at high temperature of 155℃~170℃ and high pressure of 6bar to achieve sludge dehydration. However, due to the large amount of water in the sludge, the received basic calorific value of the sludge drops sharply. Direct incineration of sludge with high water content not only fails to obtain calorific value, but also requires a large amount of auxiliary fuel, thereby increasing operating costs and energy consumption. Utility Model Content

[0004] The purpose of the utility model is to provide a sludge low-temperature acid hydrolysis device and method, which has the advantages of low energy consumption and automated operation, and solves the problem that the received basic calorific value of the sludge drops sharply due to the presence of a large amount of water in the sludge, and the direct incineration of the sludge with high water content not only fails to obtain the calorific value, but also requires the addition of a large amount of auxiliary fuel, thereby increasing the operating cost and energy consumption.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: comprising a dosing unit and a PLC controller, a reaction unit is arranged on one side of the dosing unit, and a shell and tube heat exchanger is arranged on one side of the reaction unit, a storage unit is arranged on one side of the shell and tube heat exchanger, the dosing unit comprises a medicine storage tank, an electromagnetic flow pump is arranged on one side of the medicine storage tank, the reaction unit comprises a hydrolysis tank, and electric heating rods are arranged on both sides of the inner cavity of the hydrolysis tank, a pH meter is arranged at the lower end of the left side of the inner cavity of the hydrolysis tank, and a temperature sensor is arranged at the lower end of the right side of the inner cavity of the hydrolysis tank, and the hydrolysis tank is provided with a temperature sensor. A liquid infusion pipe, a steam pipe and a feed pipe are respectively arranged on the top of the tank, the liquid infusion pipe is connected to the liquid outlet end of the flow pump, and the liquid inlet end of the flow pump is connected to the medicine storage tank, a second screw pump is arranged at the lower end of the hydrolysis tank, and the feed end and the discharge end of the second screw pump are respectively connected to the hydrolysis tank and the shell and tube heat exchanger, the storage unit includes a buffer tank, the top of the buffer tank is connected to a delivery pipe, and the other end of the delivery pipe is connected to the shell and tube heat exchanger, a third screw pump is arranged at the bottom of the buffer tank, and the feed end and the discharge end of the third screw pump are respectively connected to the buffer tank and the external plate and frame filter press.

[0006] Preferably, a first screw pump is arranged above the hydrolysis tank, a feed end of the first screw pump is connected to the sludge storage, and a discharge end of the first screw pump is connected to the feed pipe.

[0007] Preferably, the top of the medicine storage tank is connected to a liquid inlet pipe, and the top of the medicine storage tank is fixedly connected to a first motor, the output shaft of the first motor extends to the inner cavity of the medicine storage tank, and is transmission-connected to a stirring blade, the medicine storage tank and the stirring blade are both made of corrosion-resistant carbon steel, and a liquid level meter is provided on one side of the dosing unit, the hydrolysis tank and the buffer tank.

[0008] Preferably, a second motor is fixedly connected to the top of the hydrolysis tank, an output shaft of the second motor extends to the inner cavity of the hydrolysis tank, and is transmission-connected to the first stirring frame.

[0009] Preferably, a third motor is fixedly connected to the top of the buffer tank, an output shaft of the third motor extends to the inner cavity of the buffer tank, and is transmission-connected to a second stirring frame.

[0010] Preferably, the output ends of the liquid level meter, temperature sensor and pH meter are all electrically connected to the input end of the PLC controller, the output end of the PLC controller is electrically connected to the input ends of the electric heating rod, the shell and tube heat exchanger, the first screw pump, the second screw pump, the third screw pump and the electromagnetic flow pump, respectively, and the input ends of the first motor, the third motor and the second motor are all electrically connected to the output end of the PLC controller.

[0011] Preferably, the sludge low-temperature acid hydrolysis method comprises the following steps:

[0012] S1. First, sulfuric acid liquid can be injected into the inner cavity of the medicine storage tank through the liquid inlet pipe for storage. At the same time, the PLC controller will start the first motor, and the output shaft of the first motor will drive the stirring blade to rotate, so that the stirring blade stirs the sulfuric acid liquid to ensure the fluidity of the sulfuric acid liquid during storage;

[0013] S2. Start the first screw pump through the PLC controller. The first screw pump transfers the sludge containing 80% of water to the inner cavity of the feed pipe. The feed pipe injects the sludge into the inner cavity of the hydrolysis tank to facilitate the subsequent acid hydrolysis operation.

[0014] S3. The electromagnetic flow pump is turned on through the PLC controller. The sulfuric acid liquid in the medicine storage tank is transmitted to the inner cavity of the infusion tube through the electromagnetic flow pump. The infusion tube injects the sulfuric acid liquid into the inner cavity of the hydrolysis tank to facilitate the reaction of the sulfuric acid liquid with the sludge.

[0015] S4, at the same time, the second motor is turned on through the PLC controller, and the second motor drives the first stirring frame to rotate, so that the first stirring frame continuously stirs and mixes the object and the sulfuric acid liquid, and the pH value of the sludge is monitored in real time through the pH meter, and the pH value data is transmitted to the PLC controller until the pH value of the sludge reaches five;

[0016] S5. Then, the electric heating rod is turned on through the PLC controller to generate heat, and the external steam is sent into the hydrolysis tank from the bottom of the sludge through the steam pipe. The electric heating rod and the steam are used to heat the inside of the hydrolysis tank. At the same time, the temperature sensor monitors the internal temperature and transmits the temperature data to the PLC controller until the internal temperature of the hydrolysis tank reaches 85°C. Then, the sludge is boiled for 60 minutes to obtain the sludge after low-temperature acid hydrolysis.

[0017] S6. Then, the second screw pump and the shell and tube heat exchanger are turned on through the PLC controller. The second screw pump transfers the acid-hydrolyzed sludge to the inside of the shell and tube heat exchanger. The shell and tube heat exchanger operates to perform heat exchange and cooling treatment on the acid-hydrolyzed sludge. At the same time, the cooled sludge is transferred to the inside of the buffer tank through the conveying pipe.

[0018] S7, storing the cooled acid-hydrolyzed sludge in a buffer tank, and at the same time, the PLC controller starts the third motor, and the output shaft of the third motor drives the second stirring frame to stir the sludge to ensure its storage quality;

[0019] S8. Finally, the third screw pump is started through the PLC controller. The third screw pump transfers the sludge stored in the buffer tank to the external plate and frame filter press. The sludge can then be filtered through the external plate and frame filter press to obtain a mud cake with a moisture content of 56%.

[0020] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0021] The utility model can add sulfuric acid to the sludge inside the hydrolysis tank through the medicine storage tank and the electromagnetic flow pump, so that the sulfuric acid and the sludge react and the pH value of the sludge is reduced to five, which not only promotes the hydrolysis of organic molecules in the sludge and the dissolution of cell membranes, but also after the sludge cell membranes are broken, the bound water in the cells will be released and become free water that is easy to remove, effectively improving the dehydration performance of the sludge, facilitating the dehydration of the sludge by an external filter press in the later stage, so as to achieve the purpose of sludge reduction, and at the same time, by controlling the temperature inside the hydrolysis tank, it can effectively avoid some side reactions caused by high-temperature reactions, and at the same time, the required heating energy is also reduced accordingly, which greatly reduces the consumption, and the sludge can be cooled by the shell and tube heat exchanger for later processing, and at the same time, the storage unit can store the acid-lysed sludge well, which is convenient for the later sludge dehydration operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the utility model;

[0023] Figure 2 This is a schematic diagram of the three-dimensional cross-sectional structure of the hydrolysis tank of the utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the medicine storage tank of the utility model in a three-dimensional cutaway state;

[0025] Figure 4 It is a schematic diagram of the structure of the buffer tank of the utility model in a three-dimensional cutaway state.

[0026] In the figure: 1. dosing unit; 11. medicine storage tank; 12. electromagnetic flow pump; 13. first motor; 14. stirring blade; 15. liquid inlet pipe; 2. reaction unit; 21. hydrolysis tank; 211. second motor; 212. first stirring frame; 22. electric heating rod; 23. temperature sensor; 24. pH meter; 25. infusion tube; 26. steam pipe; 27. feed pipe; 3. shell and tube heat exchanger; 4. storage unit; 41. buffer tank; 411. third motor; 412. second stirring frame; 5. liquid level meter; 6. first screw pump; 7. second screw pump; 8. delivery pipe; 9. third screw pump; 10. PLC controller. DETAILED DESCRIPTION

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

[0028] The dosing unit 1, medicine storage tank 11, electromagnetic flow pump 12, first motor 13, stirring blade 14, liquid inlet pipe 15, reaction unit 2, hydrolysis tank 21, second motor 211, first stirring frame 212, electric heating rod 22, temperature sensor 23, pH meter 24, infusion tube 25, steam pipe 26, feed pipe 27, shell and tube heat exchanger 3, storage unit 4, buffer tank 41, third motor 411, second stirring frame 412, liquid level meter 5, first screw pump 6, second screw pump 7, delivery pipe 8, third screw pump 9 and PLC controller 10 of the utility model are all universal standard parts or parts known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or through conventional experimental methods.

[0029] Example 1

[0030] like Figure 1-4As shown, it is the first embodiment of the utility model, which provides a sludge low-temperature acid hydrolysis device, including a dosing unit 1 and a PLC controller 10, a reaction unit 2 is arranged on one side of the dosing unit 1, and a shell and tube heat exchanger 3 is arranged on one side of the reaction unit 2, and a storage unit 4 is arranged on one side of the shell and tube heat exchanger 3, the dosing unit 1 includes a medicine storage tank 11, and an electromagnetic flow pump 12 is arranged on one side of the medicine storage tank 11, the reaction unit 2 includes a hydrolysis tank 21, and electric heating rods 22 are arranged on both sides of the inner cavity of the hydrolysis tank 21, a pH meter 24 is arranged at the lower end of the left side of the inner cavity of the hydrolysis tank 21, and a temperature sensor 23 is arranged at the lower end of the right side of the inner cavity of the hydrolysis tank 21 A liquid infusion pipe 25, a steam pipe 26 and a feed pipe 27 are respectively arranged on the top of the hydrolysis tank 21. The liquid infusion pipe 25 is connected to the liquid outlet end of the flow pump, and the liquid inlet end of the flow pump is connected to the medicine storage tank 11. A second screw pump 7 is arranged at the lower end of the hydrolysis tank 21, and the feed end and the discharge end of the second screw pump 7 are respectively connected to the hydrolysis tank 21 and the shell and tube heat exchanger 3. The storage unit 4 includes a buffer tank 41. The top of the buffer tank 41 is connected to a delivery pipe 8, and the other end of the delivery pipe 8 is connected to the shell and tube heat exchanger 3. A third screw pump 9 is arranged at the bottom of the buffer tank 41, and the feed end and the discharge end of the third screw pump 9 are respectively connected to the buffer tank 41 and the external plate and frame filter press.

[0031] like Figure 1-4 As shown, the PLC controller 10 can control the electrical equipment to be turned on or off, so as to facilitate automated operation and improve the convenience of sludge treatment. The sulfuric acid in the medicine storage tank 11 is transmitted to the hydrolysis tank 21 through the electromagnetic flow pump 12 to contact the sludge, so that the sulfuric acid and the sludge can react to reduce the pH value of the sludge to five, which not only promotes the hydrolysis of organic molecules in the sludge and the dissolution of cell membranes, but also after the sludge cell membranes are broken, the bound water in the cells will be released and become free water that is easy to remove, effectively improving the dehydration performance of the sludge, facilitating the subsequent dehydration of the sludge by an external filter press to achieve the purpose of sludge reduction. The inside of the hydrolysis tank 21 can be heated by the electric heating rod 22 and the steam pipe 26, and the temperature inside the hydrolysis tank 21 can be controlled by the PLC controller 10 at the same time, which can effectively avoid some side reactions caused by high-temperature reactions. At the same time, the required heating energy is also reduced accordingly, which greatly reduces consumption. The sludge can be cooled by the shell and tube heat exchanger 3 for later treatment, and the storage unit 4 can store the acid-lyzed sludge well for later sludge dehydration operations.

[0032] Example 2

[0033] Reference Figure 1 and 3 , which is the second embodiment of the utility model, and this embodiment is based on the previous embodiment.

[0034] In this embodiment, a first screw pump 6 is disposed above the hydrolysis tank 21 , a feed end of the first screw pump 6 is connected to the sludge storage, and a discharge end of the first screw pump 6 is connected to the feed pipe 27 .

[0035] The top of the medicine storage tank 11 is connected to a liquid inlet pipe 15, and the top of the medicine storage tank 11 is fixedly connected to a first motor 13, the output shaft of the first motor 13 extends to the inner cavity of the medicine storage tank 11, and is transmission-connected to a stirring blade 14, the medicine storage tank 11 and the stirring blade 14 are both made of corrosion-resistant carbon steel, and a liquid level meter 5 is provided on one side of the dosing unit 1, the hydrolysis tank 21 and the buffer tank 41.

[0036] like Figure 1 and 3 As shown, the liquid level meter 5 can be used to monitor the liquid levels inside the dosing unit 1, the hydrolysis tank 21 and the buffer tank 41 in real time. At the same time, the first screw pump 6 is connected to the feed pipe 27, so that the first screw pump 6 can transfer the sludge to the feed pipe 27, and the feed pipe 27 is convenient for transferring the sludge to the hydrolysis tank 21 for internal treatment. The sulfuric acid liquid can be injected into the medicine storage tank 11 through the liquid inlet pipe 15, and the stirring blade 14 can be driven to rotate inside the medicine storage tank 11 through the output shaft of the first motor 13, so as to stir the sulfuric acid liquid and keep the sulfuric acid liquid in a flowing state at all times.

[0037] Example 3

[0038] Reference Figure 1 , 2 and 4, which are the third embodiment of the present utility model, and this embodiment is based on the first two embodiments.

[0039] In this embodiment, a second motor 211 is fixedly connected to the top of the hydrolysis tank 21 , and an output shaft of the second motor 211 extends to the inner cavity of the hydrolysis tank 21 and is transmission-connected to a first stirring frame 212 .

[0040] A third motor 411 is fixedly connected to the top of the buffer tank 41 . The output shaft of the third motor 411 extends to the inner cavity of the buffer tank 41 and is transmission-connected to the second stirring frame 412 .

[0041] The output ends of the liquid level meter 5, the temperature sensor 23 and the pH meter 24 are all electrically connected to the input end of the PLC controller 10, and the output end of the PLC controller 10 is electrically connected to the input ends of the electric heating rod 22, the shell and tube heat exchanger 3, the first screw pump 6, the second screw pump 7, the third screw pump 9 and the electromagnetic flow pump 12 respectively, and the input ends of the first motor 13, the third motor 411 and the second motor 211 are all electrically connected to the output end of the PLC controller 10.

[0042] like Figure 1 , 2As shown in Figure 4, the first stirring frame 212 is driven by the second motor 211 to rotate in the inner cavity of the hydrolysis tank 21, so that the sludge and the sulfuric acid liquid can be stirred to make them mix and react quickly. At the same time, the third motor 411 drives the second stirring frame 412 to rotate inside the buffer tank 41, which can stir the sludge well to ensure the sludge storage quality. The PLC controller 10 is electrically connected with the liquid level meter 5, the temperature sensor 23 and the pH meter 24, so that the monitoring data can be mastered in real time. At the same time, the PLC controller 10 is electrically connected with the electric heating rod 22, the shell and tube heat exchanger 3, the first screw pump 6, the second screw pump 7, the third screw pump 9, the electromagnetic flow pump 12, the first motor 13, the third motor 411 and the second motor 211, so that the PLC controller 10 can control the electric heating rod 22, the shell and tube heat exchanger 3, the first screw pump 6, the second screw pump 7, the third screw pump 9, the electromagnetic flow pump 12, the first motor 13, the third motor 411 and the second motor 211 to open or close, thereby realizing automatic operation.

[0043] A method for using a sludge low-temperature acid hydrolysis device, wherein the sludge low-temperature acid hydrolysis method comprises the following steps:

[0044] S1. First, sulfuric acid liquid can be injected into the inner cavity of the medicine storage tank 11 through the liquid inlet pipe 15 for storage. At the same time, the PLC controller 10 will turn on the first motor 13, and the output shaft of the first motor 13 will drive the stirring blade 14 to rotate, so that the stirring blade 14 stirs the sulfuric acid liquid to ensure the fluidity of the sulfuric acid liquid during storage;

[0045] S2, the first screw pump 6 is turned on through the PLC controller 10, and the first screw pump 6 transfers the sludge containing 80% of water to the inner cavity of the feed pipe 27, and the feed pipe 27 injects the sludge into the inner cavity of the hydrolysis tank 21, so as to facilitate the subsequent acid hydrolysis operation;

[0046] S3, the electromagnetic flow pump 12 is turned on through the PLC controller 10, and the sulfuric acid liquid inside the medicine storage tank 11 is transmitted to the inner cavity of the infusion tube 25 through the electromagnetic flow pump 12, and the infusion tube 25 injects the sulfuric acid liquid into the inner cavity of the hydrolysis tank 21, so that the sulfuric acid liquid reacts with the sludge;

[0047] S4, at the same time, the second motor 211 is turned on through the PLC controller 10, and the second motor 211 drives the first stirring frame 212 to rotate, so that the first stirring frame 212 continuously stirs and mixes the object and the sulfuric acid liquid, and the pH value of the sludge is monitored in real time through the pH meter 24, and the pH value data is transmitted to the PLC controller 10 until the pH value of the sludge reaches five;

[0048] S5, then the electric heating rod 22 is turned on by the PLC controller 10 to generate heat, and the external steam is sent into the hydrolysis tank 21 from the bottom of the sludge through the steam pipe 26, and the inside of the hydrolysis tank 21 is heated by the cooperation of the electric heating rod 22 and the steam. At the same time, the temperature sensor 23 monitors the internal temperature and transmits the temperature data to the PLC controller 10 until the internal temperature of the hydrolysis tank 21 reaches 85°C, and then the sludge is boiled for 60 minutes to obtain the sludge after low-temperature acid hydrolysis;

[0049] S6, then the second screw pump 7 and the shell and tube heat exchanger 3 are turned on through the PLC controller 10, the second screw pump 7 transfers the acid-hydrolyzed sludge to the inside of the shell and tube heat exchanger 3, and the shell and tube heat exchanger 3 operates to perform heat exchange and cooling treatment on the acid-hydrolyzed sludge, and the cooled sludge is transferred to the inside of the buffer tank 41 through the conveying pipe 8;

[0050] S7, the cooled acid-hydrolyzed sludge is stored in the buffer tank 41, and at the same time, the PLC controller 10 turns on the third motor 411, and the output shaft of the third motor 411 drives the second stirring frame 412 to stir the sludge to ensure its storage quality;

[0051] S8. Finally, the third screw pump 9 is turned on through the PLC controller 10. The third screw pump 9 transfers the sludge stored in the buffer tank 41 to the external plate and frame filter press. The sludge can then be filtered through the external plate and frame filter press to obtain a mud cake with a moisture content of 56%.

[0052] The standard parts used in this application document can all be purchased from the market and can be customized according to the description in the specification and drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art. The control method is automatic control through a controller. The control circuit of the controller can be implemented through simple programming by technicians in this field, which is common knowledge in the field. This application is mainly used to protect mechanical devices, so this application no longer explains the control method and circuit connection in detail.

[0053] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0054] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sludge low-temperature acid hydrolysis device, comprising a dosing unit (1) and a PLC controller (10), characterized in that: A reaction unit (2) is arranged on one side of the dosing unit (1), and a shell-and-tube heat exchanger (3) is arranged on one side of the reaction unit (2), and a storage unit (4) is arranged on one side of the shell-and-tube heat exchanger (3). The dosing unit (1) includes a medicine storage tank (11), and an electromagnetic flow pump (12) is arranged on one side of the medicine storage tank (11). The reaction unit (2) includes a hydrolysis tank (21), and electric heating rods (22) are arranged on both sides of the inner cavity of the hydrolysis tank (21). A pH meter (24) is arranged at the lower end of the left side of the inner cavity of the hydrolysis tank (21), and a temperature sensor (23) is arranged at the lower end of the right side of the inner cavity of the hydrolysis tank (21). The top of the hydrolysis tank (21) is respectively provided with an infusion tube (25), a steam generator (26), and a liquid heating tube (27). The invention relates to a novel hydrolysis tank (21) comprising a first screw pump (26) and a second screw pump (7). The first screw pump (26) and the second screw pump (7) are connected to a feed pipe (27). The feed pipe (25) is connected to a liquid outlet of a flow pump, and the liquid inlet of the flow pump is connected to a medicine storage tank (11). The lower end of the hydrolysis tank (21) is provided with a second screw pump (7), and the feed end and the discharge end of the second screw pump (7) are respectively connected to the hydrolysis tank (21) and the shell and tube heat exchanger (3). The storage unit (4) comprises a buffer tank (41). The top of the buffer tank (41) is connected to a delivery pipe (8), and the other end of the delivery pipe (8) is connected to the shell and tube heat exchanger (3). The bottom of the buffer tank (41) is provided with a third screw pump (9), and the feed end and the discharge end of the third screw pump (9) are respectively connected to the buffer tank (41) and an external plate and frame filter press.

2. A sludge low-temperature acid hydrolysis device according to claim 1, characterized in that: A first screw pump (6) is arranged above the hydrolysis tank (21), the feed end of the first screw pump (6) is connected to the sludge storage, and the discharge end of the first screw pump (6) is connected to the feed pipe (27).

3. A sludge low-temperature acid hydrolysis device according to claim 1, characterized in that: The top of the medicine storage tank (11) is connected to a liquid inlet pipe (15), and the top of the medicine storage tank (11) is fixedly connected to a first motor (13), the output shaft of the first motor (13) extends to the inner cavity of the medicine storage tank (11), and is transmission-connected to a stirring blade (14), the medicine storage tank (11) and the stirring blade (14) are both made of corrosion-resistant carbon steel, and a liquid level meter (5) is provided on one side of the dosing unit (1), the hydrolysis tank (21) and the buffer tank (41).

4. A sludge low-temperature acid hydrolysis device according to claim 3, characterized in that: A second motor (211) is fixedly connected to the top of the hydrolysis tank (21); an output shaft of the second motor (211) extends to the inner cavity of the hydrolysis tank (21) and is transmission-connected to a first stirring frame (212).

5. A sludge low-temperature acid hydrolysis device according to claim 4, characterized in that: A third motor (411) is fixedly connected to the top of the buffer tank (41); an output shaft of the third motor (411) extends to the inner cavity of the buffer tank (41) and is transmission-connected to a second stirring frame (412).

6. A sludge low-temperature acid hydrolysis device according to claim 5, characterized in that: The output ends of the liquid level meter (5), the temperature sensor (23) and the pH meter (24) are all electrically connected to the input end of the PLC controller (10); the output end of the PLC controller (10) is respectively electrically connected to the input ends of the electric heating rod (22), the shell and tube heat exchanger (3), the first screw pump (6), the second screw pump (7), the third screw pump (9) and the electromagnetic flow pump (12); the input ends of the first motor (13), the third motor (411) and the second motor (211) are all electrically connected to the output end of the PLC controller (10).

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