Hydrothermal carbonization treatment device for high-solid-content sludge

Abstract

The utility model relates to the technical field of sludge treatment and disposal, and discloses a high-solid-content sludge hydrothermal carbonization treatment device which comprises a sludge bin, the mixed material preheating tank is provided with a first feed port, a second feed port, a steam inlet and a discharge port, and the sludge bin is communicated with the first feed port; the hydrothermal reaction kettle is communicated with the discharge hole through a first pipeline; the flash tank is communicated with the output end of the hydrothermal reaction kettle through a second pipeline, the flash tank is provided with a steam outlet, a first discharge port and a second discharge port, the steam outlet is communicated to the steam inlet through a third pipeline, and the second discharge port is communicated to the second feed port through a fourth pipeline; the cooling tank is communicated with the first discharge hole through a fifth pipeline. The high-solid-content sludge hydrothermal carbonization treatment device disclosed by the utility model can effectively reduce treatment energy consumption and improve treatment efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of sludge treatment and disposal, in particular to a hydrothermal carbonization treatment device for high-solid sludge. Background Art

[0002] Hydrothermal carbonization (HTC) technology is a technology for carbonizing biomass raw materials using a hydrothermal medium under high temperature and high pressure conditions. Compared with conventional biomass pyrolysis technology, water does not undergo a phase change during the hydrothermal carbonization process of biomass, the energy consumption is low, organic matter with any water content can be used as raw materials, and there is no emission during the reaction process. It is a cutting-edge technology in the field of biomass treatment. This technology is carried out in an aqueous environment and does not require drying of the materials, so it is particularly suitable for water-rich bioorganic waste and sludge.

[0003] The sludge hydrothermal carbonization treatment process modifies sludge in a closed environment, releases free water, and realizes the stabilization, harmlessness, and reduction of sludge. There is no latent heat of vaporization of water in the whole process, so the energy consumption is significantly lower than that of traditional thermal drying and the treatment efficiency is high. However, the sludge hydrothermal carbonization technology is restricted by the requirements of pump transportation. The sludge needs to have a certain fluidity, so the moisture content of the sludge to be treated is limited to 75 - 90%, and it is difficult to treat high-solid sludge, and the energy consumption is high.

[0004] Therefore, how to provide a hydrothermal carbonization treatment device for high-solid sludge with low energy consumption and high treatment efficiency is an urgent problem to be solved by those skilled in the art. Summary of the Utility Model

[0005] In view of this, the utility model provides a hydrothermal carbonization treatment device for high-solid sludge to solve the problems of difficult treatment and high energy consumption of existing high-solid sludge.

[0006] To solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A hydrothermal carbonization treatment device for high-solid sludge, comprising:

[0008] A sludge silo;

[0009] A mixing and preheating tank, which is provided with a first feed inlet, a second feed inlet, a steam inlet, and a discharge outlet, and the sludge silo is communicated with the first feed inlet;

[0010] A hydrothermal reaction kettle, which is communicated with the discharge outlet through a first pipeline;

[0011] A flash evaporation tank, the flash evaporation tank is communicated with the output end of the hydrothermal reaction kettle through a second pipeline, and the flash evaporation tank is provided with a steam outlet, a first discharge port and a second discharge port. The steam outlet is communicated to the steam inlet through a third pipeline, and the second discharge port is communicated to the second feed inlet through a fourth pipeline;

[0012] A cooling tank, the cooling tank is communicated with the first discharge port through a fifth pipeline.

[0013] Preferably, a first stirrer is installed inside the mixing and preheating tank. The first stirrer includes a first stirring shaft and first stirring blades. Both the first stirring shaft and the first stirring blades are of hollow structure and are provided with steam outlet holes on the surface.

[0014] Preferably, a second stirrer is installed inside the hydrothermal reaction kettle. The second stirrer includes a second stirring shaft and second stirring blades. Both the second stirring shaft and the second stirring blades are of hollow structure and are internally provided with a heat conduction medium.

[0015] Preferably, a heating jacket is provided outside the hydrothermal reaction kettle.

[0016] Preferably, a thermometer, a pH meter, a viscometer and a pressure gauge are provided inside the hydrothermal reaction kettle.

[0017] Preferably, a third stirrer is installed inside the flash evaporation tank.

[0018] Preferably, a thermometer and a pressure gauge are provided inside the flash evaporation tank.

[0019] Preferably, the steam outlet is opened at the top of the flash evaporation tank, and the first discharge port and the second discharge port are both opened at the bottom of the flash evaporation tank.

[0020] Preferably, the first feed inlet and the second feed inlet are both opened at the top of the mixing and preheating tank, and the steam inlet is opened at the bottom of the mixing and preheating tank.

[0021] Preferably, a screw pump and a control valve are provided on the first pipeline.

[0022] Preferably, a control valve is provided on the second pipeline.

[0023] Preferably, a steam flowmeter, a thermometer, a pressure gauge and a control valve are provided on the third pipeline.

[0024] Liquid flowmeters and control valves are provided on both the fourth pipeline and the fifth pipeline.

[0025] Preferably, a screw conveyor is further included, and the sludge silo is connected to the mixing and preheating tank through the screw conveyor.

[0026] The utility model provides a hydrothermal carbonization treatment device for high-solid sludge. Compared with the prior art, its beneficial effects are as follows:

[0027] The flash evaporation tank of the utility model is provided with a first discharge port and a second discharge port to divide the sludge biochar slurry after flash evaporation into two parts. One part returns to the mixing and preheating tank through the second discharge port to be mixed with the high-solid sludge, improving the fluidity of the sludge. The remaining part enters the cooling tank through the first discharge port for cooling and then solid-liquid separation, which can effectively reduce the treatment energy consumption and improve the treatment efficiency.

[0028] In addition, the steam in the flash evaporation tank of the utility model is returned to the mixing and preheating tank through the steam outlet. Recycling the steam to directly heat the sludge can not only relieve pressure but also reduce temperature, improving the waste heat recovery efficiency and further reducing the treatment energy consumption. The treatment energy consumption is about 0.4 MJ / kg. Description of the Drawings

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0030] Figure 1 It is a schematic diagram of the hydrothermal carbonization treatment device for high-solid sludge in the embodiment of the present utility model.

[0031] In the figure:

[0032] 10 - sludge silo, 20 - mixing and preheating tank, 21 - first stirrer, 30 - hydrothermal reaction kettle, 31 - second stirrer, 40 - flash evaporation tank, 41 - third stirrer, 50 - cooling tank, 51 - fourth stirrer, 60 - screw conveyor, 71 - first pipeline, 72 - second pipeline, 73 - third pipeline, 74 - fourth pipeline, 75 - fifth pipeline, 76 - screw pump. Detailed Embodiments

[0033] The following will further describe in detail the specific embodiments of the present utility model in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0034] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0035] The terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0036] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0037] As Figure 1 shown, an embodiment of the present utility model provides a high-solid sludge hydrothermal carbonization treatment device, which includes a sludge bin 10, and a mixing and preheating tank 20, a hydrothermal reaction kettle 30, a flash evaporation tank 40, and a cooling tank 50 that are sequentially connected to the sludge bin 10.

[0038] In some embodiments of the present utility model, the mixing and preheating tank 20 is provided with a first feed inlet, a second feed inlet, a steam inlet, and a discharge outlet. The sludge bin 10 is connected to the first feed inlet. Preferably, the sludge bin 10 and the mixing and preheating tank 20 are connected by a screw conveyor 60.

[0039] It can be understood that one end of the screw conveyor 60 is arranged at the sludge outlet of the sludge bin 10, and the other end is arranged at the first feed inlet, which can evenly convey the sludge into the mixing and preheating tank 20.

[0040] Optionally, both the first feed inlet and the second feed inlet are opened at the top of the mixing and preheating tank 20, and the raw sludge and the sludge biochar slurry after flash evaporation treatment can fall into the bottom of the mixing and preheating tank 20 under the action of gravity; the steam inlet is opened at the bottom of the mixing and preheating tank 20. Combining the characteristic of the upward movement of steam, opening the steam inlet at the bottom can comprehensively heat the sludge in the mixing and preheating tank 20 from bottom to top.

[0041] Optionally, a first stirrer 21 is installed inside the mixing and preheating tank 20. The first stirrer 21 includes a first stirring shaft and first stirring blades. Both the first stirring shaft and the first stirring blades are of hollow structure and are provided with steam outlet holes on the surface.

[0042] It can be understood that by installing a stirrer, the sludge in the mixing and preheating tank 20 can always be in a moving state, and the preheating process is faster. By providing steam outlet holes on the hollow stirring shaft and stirring blades, steam can heat the sludge during the stirring process, and the preheating degree of the sludge is more uniform and faster.

[0043] In some embodiments of the present invention, the hydrothermal reactor 30 is communicated with the discharge port through a first pipeline 71; preferably, a screw pump 76 and a control valve are provided on the first pipeline 71. The screw pump 76 can pump the sludge in the mixing and preheating tank 20 into the hydrothermal reactor 30, and the control valve can effectively control the amount of sludge entering the hydrothermal reactor 30.

[0044] Optionally, a second stirrer 31 is installed inside the hydrothermal reactor 30. The second stirrer 31 includes a second stirring shaft and second stirring blades. Both the second stirring shaft and the second stirring blades are of hollow structure and are internally provided with a heat-conducting medium.

[0045] It can be understood that by installing a stirrer, the sludge in the hydrothermal reactor 30 can always be in a moving state, and the hydrothermal reaction is more complete. By introducing a heat-conducting medium such as heat-conducting oil into the hollow stirring shaft and stirring blades, the temperature of the materials in the hydrothermal reactor 30 can be increased more quickly, and the hydrothermal reaction rate can be improved.

[0046] Optionally, a heating jacket is provided outside the hydrothermal reactor 30. On the one hand, it can heat the sludge in the hydrothermal reactor 30, and on the other hand, it can play a certain heat preservation role when the temperature reaches the preset temperature.

[0047] Optionally, a thermometer, a pH meter, a viscometer and a pressure gauge are provided inside the hydrothermal reactor 30. By detecting the parameter changes in the hydrothermal reactor 30 in real time, the environment in the hydrothermal reactor 30 can be controlled in real time, which is convenient for adjusting the temperature, pH, viscosity, etc. of the sludge according to the detected data to ensure the smooth progress of the hydrothermal carbonization reaction.

[0048] In some embodiments of the present utility model, the flash evaporation tank 40 is communicated with the output end of the hydrothermal reaction kettle 30 through a second pipeline 72. A control valve is provided on the second pipeline 72, and the flash evaporation tank 40 is provided with a steam outlet, a first discharge port and a second discharge port; the steam outlet is communicated with the steam inlet through a third pipeline 73. A steam flow meter, a thermometer, a pressure gauge and a control valve are provided on the third pipeline 73, so that the steam condition can be understood in real time; the second discharge port is communicated with the second feed port through a fourth pipeline 74. A liquid flow meter and a control valve are provided on the fourth pipeline 74, which can effectively control the reflux amount of the sludge carbon slurry; preferably, the steam outlet is opened at the top of the flash evaporation tank 40, and the steam is returned to the mixing and preheating tank 20 by using the characteristics of the steam itself. The first discharge port and the second discharge port are both opened at the bottom of the flash evaporation tank 40.

[0049] It can be understood that the sludge biochar slurry obtained after hydrothermal reaction is transported to the flash evaporation tank 40 for flash evaporation, and the flash evaporation steam and part of the sludge biochar slurry after flash evaporation are returned to the mixing and preheating tank 20. On the one hand, the present utility model adopts the method of returning a part of the sludge biochar slurry after flash evaporation to the mixing and preheating tank 20 to mix with the high-solid-content sludge, improving the fluidity of the sludge. On the other hand, the present utility model adopts the method of recovering the waste heat of the material steam after hydrothermal carbonization, and uses the steam to directly heat the original sludge, which can not only relieve the pressure of the flash evaporation tank 40 but also reduce the temperature, improving the waste heat recovery utilization rate.

[0050] Optionally, a third stirrer 41 is installed inside the flash evaporation tank 40, which can make the reaction more sufficient and rapid; a thermometer and a pressure gauge are provided inside the flash evaporation tank 40, which can detect and understand the situation inside the flash evaporation tank 40 in real time. The operator can adjust in time according to the detection situation to ensure the smooth progress of the reaction.

[0051] In some embodiments of the present utility model, the cooling tank 50 is communicated with the first discharge port through a fifth pipeline 75. Preferably, a fourth stirrer 51 is installed inside the cooling tank 50, which can make the reaction more sufficient and rapid; a liquid flow meter and a control valve are provided on the fifth pipeline 75, which can effectively control the amount of the sludge biochar slurry entering the cooling tank 50.

[0052] It can be understood that the present utility model adopts the method of returning a part of the sludge biochar slurry after flash evaporation to the mixing and preheating tank 20 to mix with the high-solid-content sludge, improving the fluidity of the sludge. The remaining part enters the cooling tank 50 for cooling and then solid-liquid separation, realizing the hydrothermal carbonization treatment of the high-solid-content sludge.

[0053] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present utility model, several improvements and substitutions can still be made, and these improvements and substitutions should also be regarded as the protection scope of the present utility model.

Claims

1. A high-solid sludge hydrothermal carbonization treatment device, characterized in that: include: Sludge silo; A mixing preheating tank, wherein the mixing preheating tank is provided with a first feed inlet, a second feed inlet, a steam inlet and a discharge port, and the sludge silo is connected to the first feed inlet; A hydrothermal reaction kettle, wherein the hydrothermal reaction kettle is connected to the discharge port through a first pipeline; A flash tank, wherein the flash tank is connected to the output end of the hydrothermal reactor through a second pipeline, and the flash tank is provided with a steam outlet, a first material outlet, and a second material outlet, the steam outlet is connected to the steam inlet through a third pipeline, and the second material outlet is connected to the second material inlet through a fourth pipeline; A cooling tank is connected to the first discharge port through a fifth pipeline.

2. The high-solid sludge hydrothermal carbonization treatment device according to claim 1 is characterized in that: A first agitator is installed inside the mixing preheating tank. The first agitator includes a first agitator shaft and a first agitator blade. Both the first agitator shaft and the first agitator blade are hollow structures and have steam outlet holes on their surfaces.

3. The high-solid sludge hydrothermal carbonization treatment device according to claim 1 is characterized in that: A second stirrer is installed inside the hydrothermal reactor. The second stirrer includes a second stirring shaft and a second stirring blade. Both the second stirring shaft and the second stirring blade are hollow structures and have heat-conducting medium inside.

4. The high-solid sludge hydrothermal carbonization treatment device according to claim 1 is characterized in that: The outside of the hydrothermal reactor is provided with a heating jacket; The hydrothermal reactor is provided with a thermometer, a pH meter, a viscometer and a pressure gauge.

5. The high-solid sludge hydrothermal carbonization treatment device according to claim 1 is characterized in that: A third agitator is installed inside the flash tank; A thermometer and a pressure gauge are provided inside the flash tank.

6. The high-solid sludge hydrothermal carbonization treatment device according to claim 1 is characterized in that: The steam outlet is opened at the top of the flash tank, and the first material outlet and the second material outlet are both opened at the bottom of the flash tank.

7. The high-solid sludge hydrothermal carbonization treatment device according to claim 1 is characterized in that: The first feed inlet and the second feed inlet are both opened at the top of the mixing preheating tank, and the steam inlet is opened at the bottom of the mixing preheating tank.

8. The high-solid sludge hydrothermal carbonization treatment device according to claim 1 is characterized in that: The first pipeline is provided with a screw pump and a control valve; The second pipeline is provided with a control valve.

9. The high-solid sludge hydrothermal carbonization treatment device according to claim 1, characterized in that: The third pipeline is provided with a steam flow meter, a thermometer, a pressure gauge and a control valve; The fourth pipeline and the fifth pipeline are both provided with a liquid flow meter and a control valve.

10. The high-solid sludge hydrothermal carbonization treatment device according to any one of claims 1 to 9, characterized in that: It also includes a screw conveyor, through which the sludge silo and the mixing preheating tank are connected.

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