CN115784547A - Organic Waste Anaerobic Digestion Reactor - Google Patents

Abstract

The invention discloses an anaerobic digestion reactor for organic waste, which includes a reaction tank, and also includes: an agitator for generating horizontal swirling flow, the agitator is arranged in the reaction tank, and the agitator The stirring shaft is arranged along the central axis of the reaction tank; the guide tube is used to transport the biogas slurry at the top of the reaction tank to the bottom of the reaction tank, and the guide tube is arranged outside the reaction tank, and the upper end of the guide tube is and the lower end are respectively communicated with the reaction tank; the flow pusher is used to provide power for the flow of the fluid in the draft tube, and the described flow booster is arranged in the draft tube; the slurry inlet is used to provide reaction tank for the reaction tank. raw materials, the slurry inlet is communicated with the reaction tank, and the invention provides an organic waste anaerobic digestion reactor with simple structure and large volume load.

Description

Organic Waste Anaerobic Digestion Reactor

technical field

The invention relates to the technical field of organic biomass waste resource treatment, in particular to an anaerobic digestion reactor for organic waste.

Background technique

The continuous stirred tank reactor or continuous stirred tank reactor (CSTR for short) is the main means to realize the anaerobic digestion of agricultural waste, activated sludge and other biomass wastes to produce biogas.

A stirring device is installed in the digestion reactor. The purpose of stirring is to make the fermentation raw materials and microorganisms in a completely mixed state, avoid stratification, increase the chance of contact between materials and microorganisms, and facilitate the uniformity of reaction and heat transfer. In a closed tank The process of fermentation of feed liquid and generation of biogas is completed in the body. However, due to the change of the composition of the material entering the reactor and the fluctuation of the reaction conditions, it will affect the density and viscosity of the material in the reactor, which will lead to the stratification of the material and affect the efficiency and stability of the reactor. It usually manifests in the following three phenomena : 1. Grease and fibrous substances float on the upper part of the tank, which not only reduces the amount of biogas produced by the reactor, but also forms crusts, which affects the safety of operation; 2. Gravel substances will deposit into the reactor tank The bottom of the reactor reduces the effective volume of the reactor and blocks the pipeline; 3. The local acidification of the reactor due to uneven mixing will gradually spread and cause the acidification of the entire reactor, resulting in the collapse of the reactor. In addition, the sludge retention time of the fully mixed anaerobic reactor is consistent with the hydraulic retention time, and it cannot provide a longer sludge retention time to reproduce and produce more anaerobic sludge to increase the sludge concentration and improve the reaction rate. volumetric efficiency of the vessel.

According to the prior art, there is an anaerobic digestion sweeping and slag breaking device and an anaerobic digestion treatment system, the publication number of which is CN205096222U. By setting the guide tube on the side wall of the anaerobic reactor, the liquid supply mechanism sucks and digests from the inner cavity of the guide tube. The material is supplied to the sweeping mechanism to spray and sweep the liquid surface of the digested material in the anaerobic reactor. Once the liquid surface of the digested material forms scum, the material flow formed by the injection can quickly break up the formed scum and make the scum flow to the side In the wall guide tube, the scum and scale on the liquid surface of the digested material cannot be formed, which can effectively improve the scum and scale problem generated during the anaerobic digestion of high-solid organic waste, and improve the digestion efficiency and anaerobic reaction. Gas production rate, but additional cleaning mechanism is required, the structure is complex, and the mud and water inside are mixed together, the residence time of anaerobic sludge in the reactor is short, the sludge concentration in the reactor is low, and the reactor Small volume load.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the above defects of the prior art and provide an anaerobic digestion reactor for organic waste with simple structure and large volume load.

In order to achieve the above object, the technical scheme of the present invention is: a kind of organic waste anaerobic digestion reactor, comprises reaction tank, and it also comprises:

A stirrer, used to generate a horizontal swirling flow, the stirrer is arranged in the reaction tank, and the stirring shaft of the stirrer is arranged along the central axis of the reaction tank;

A guide tube, used to transport the biogas slurry at the top of the reaction tank to the bottom of the reaction tank, the guide tube is arranged outside the reaction tank, and the upper end and the lower end of the guide tube communicate with the inside of the reaction tank respectively;

A flow pusher, which is used to provide power for the flow of fluid in the flow guide tube, and the flow pusher is arranged in the flow guide tube;

The slurry inlet is used for supplying reaction raw materials to the reaction tank, and the slurry inlet is communicated with the reaction tank.

After adopting the above structure, the present invention has the following advantages compared with the prior art: a stirrer is set in the reaction tank, the materials are fully mixed in the horizontal direction, the swirling flow will generate centrifugal force, and due to the density difference, the gravel and anaerobic sludge will It moves to the tank wall and settles down along the tank wall, realizes the separation of mud and water to a certain extent in the reaction tank, prolongs the residence time of anaerobic sludge in the reaction tank, increases the sludge concentration in the reaction tank, and improves The volume load of the reaction tank;

A diversion cylinder is installed outside the reaction tank and a propeller is installed inside the diversion cylinder. The upper and lower ends of the diversion cylinder are respectively connected with the reaction tank, and the biogas slurry on the top of the reaction tank is pushed to the bottom of the reaction tank, and then the liquid in the reaction tank The material flows from the bottom to the top, forming a vertical forced circulation mixing, and is mixed again by the agitator, which strengthens the mixing effect, promotes the occurrence of the reaction, improves the digestion efficiency and gas production rate of the anaerobic reaction, and has a simple structure.

Preferably, the stirring shaft is provided with an upper paddle and a lower paddle respectively, the upper paddle and the lower paddle are arranged horizontally, the upper and lower surfaces of the upper paddle and the lower paddle are horizontal, The structure is simple, which ensures the horizontal mixing of the materials in the reaction tank. The swirling flow formed by the stirring pushes the dense gravel and anaerobic sludge to the tank wall, and settles along the tank wall to the bottom of the tank.

As a preference, the upper end of the guide tube is provided with a guide tube inlet, the guide tube inlet is located at the top of the reaction tank and the guide tube inlet is located above the upper paddle, which can guide the material at the top of the reaction tank to the bottom of the reaction tank to achieve vertical forced mixing.

As a preference, the lower end of the guide tube is provided with a guide tube outlet, the outlet of the guide tube is arranged on the inner wall of the reaction tank and the outlet of the guide tube is located below the lower paddle, which is beneficial to the inner wall of the reaction tank. Settling sand and anaerobic sludge are pushed towards the center of the tank.

As preferably, it also includes a sand discharge pipe for discharging sand, the sand discharge pipe is arranged at the bottom of the reaction tank and the sand discharge pipe is located below the agitator, and the outlet water flow of the draft tube will settle at the bottom of the reaction tank wall The sand and gravel are continuously pushed to the center of the reaction tank and discharged through the sand discharge pipe to avoid the deposition of sand and gravel.

Preferably, it also includes a guide tube, one end of the guide tube communicates with the upper end of the guide tube, the other end of the guide tube extends to the agitator, and the inlet of the guide tube is set at the other end of the guide tube One end is convenient to divert more material from the top of the reaction tank into the guide tube.

Preferably, it also includes a biogas slurry discharge port for discharging biogas slurry. The biogas slurry discharge port is arranged on the side of the reaction tank and the biogas slurry discharge port is located above the inlet of the draft tube. Due to the centrifugal force and gravity, the reaction The anaerobic sludge in the tank moves to the wall and bottom of the reaction tank, so the concentration of anaerobic sludge is lower at the higher position and the center of the reaction tank. The top of the diversion cylinder is the highest liquid level of the reaction tank, and the biogas slurry is discharged from this position, which is conducive to intercepting anaerobic sludge and effectively prolonging the residence time of sludge.

Preferably, it also includes a biogas collection port for collecting biogas, and the biogas collection port is arranged on the top of the reaction tank so as to collect and discharge the biogas generated in the reaction tank.

Preferably, the guide tubes are respectively located on the left and right sides of the reaction tank, and the effect is good.

As a preference, the slurry inlet is arranged on the guide cylinder and the slurry inlet is located above the flow pusher, the organic slurry can be driven into the flow guide cylinder by pumping, and then through the action of the flow pusher, The slurry is first mixed with the circulating biogas slurry in the draft tube; then the water flow at the outlet of the draft tube continuously pushes the anaerobic sludge settled at the bottom of the tank wall to the center of the reaction tank. During this process, the sludge and The raw materials entering from the side wall of the draft tube are mixed and contacted; then the mixture of sludge and raw materials at the bottom of the reaction tank moves upward with the water flow, and is mixed again by the agitator, which strengthens the mixing effect and promotes the reaction.

Preferably, the flow impeller includes turbine blades and has a simple structure.

Description of drawings

Fig. 1 is a schematic front view of an organic waste anaerobic digestion reactor with double guide tubes according to the present invention.

Fig. 2 is a schematic front view of an organic waste anaerobic digestion reactor with a draft tube in the present invention.

Among them, 1. Reaction tank, 2. Agitator, 3. Guide tube, 4. Pusher, 5. Blade inlet, 6. Sand discharge pipe, 7. Biogas slurry discharge port, 8. Biogas collection port, 9 , the upper blade, 10, the lower blade, 11, the inlet of the guide tube, 12, the outlet of the guide tube, 13, the guide tube;

→: Flow direction of fluid.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figures 1 and 2, the present invention provides a kind of organic waste anaerobic digestion reactor, comprises reaction tank 1, establishes agitator 2 in reaction tank 1, and agitator 2 comprises stirring shaft, is used for horizontal mixing reaction tank 1 The upper paddle 9 of the upper material and the lower paddle 10 used for horizontally mixing the lower material of the reaction tank 1, the stirring shaft is vertically arranged on the central axis of the reaction tank 1, and the upper paddle 9 and the lower paddle 10 are arranged on the stirring On the shaft and the upper paddle 9 is located above the lower paddle 10, the upper paddle 9 and the lower paddle 10 are all horizontally arranged, and the upper and lower surfaces of the upper paddle 9 and the lower paddle 10 are all horizontal, so that the agitator 2 rotates to drive the reaction tank The liquid in 1 forms a horizontal swirling flow, and the materials are fully mixed in the horizontal direction; the swirling flow will generate centrifugal force, and due to the density difference, the gravel and anaerobic sludge will move to the tank wall and settle down along the tank wall. The mud-water separation is realized to a certain extent in the reaction tank 1, and the residence time of the anaerobic sludge in the reaction tank is prolonged.

A guide tube 3 is arranged outside the reaction tank 1, the upper end of the guide tube 3 communicates with the upper end of the reaction tank 1 through the guide tube inlet 11, and the lower end of the guide tube 3 communicates with the lower end of the reaction tank 1 through the guide tube outlet 12, and at the same time A pusher 4 for providing downward thrust to the fluid in the draft tube 3 is provided in the draft tube 3, and the biogas slurry at the top of the reaction tank 1 is pushed to the bottom of the reaction tank 1 by the flow booster 4, and then reacted The material in the tank 1 flows from the bottom to the top, forming a vertical forced circulation mixing. During this process, the sludge and the raw materials entering from the side wall of the guide tube 3 are initially mixed and contacted; then the bottom of the reaction tank 1 The mixture of sludge and raw materials will move upward with the water flow and be mixed again by the agitator 2, which strengthens the mixing effect and improves the digestion efficiency and gas production rate of the anaerobic reaction.

In addition, a slurry inlet 5 is provided on the reaction tank 1 for providing reaction raw materials to the reaction tank 1 .

As an example, the slurry inlet 5 is located on the side wall of the guide tube 3 and above the flow pusher 4, and the organic slurry can be driven into the flow guide tube 3 by pumping, and then passed through the flow guide tube 4 The slurry is first mixed with the circulating biogas slurry in the draft tube 3; then the water flow at the outlet 12 of the draft tube continuously pushes the anaerobic sludge settled at the bottom of the tank wall to the center of the reaction tank 1, where During the process, the sludge is mixed and contacted with the raw materials entering from the side wall of the guide tube 3; then the mixture of sludge and raw materials at the bottom of the reaction tank 1 will move upward with the water flow and be mixed again by the agitator 2, which strengthens the mixing process. effect to facilitate the reaction.

As an example, the inlet of the draft tube 3 is located at the top of the reaction tank 1 and the inlet 11 of the draft tube is located above the upper paddle 9 for collecting the biogas slurry at the top of the reaction tank 1; The tank wall at the bottom of the tank 1 and the outlet 12 of the guide tube are located below the paddles 10 of the lower layer, and are used to discharge the materials in the guide tube 3 at a fixed point. The diversion cylinder 3 pushes the biogas slurry at the top of the reaction tank 1 to the bottom of the reaction tank 1, and then the material in the reaction tank 1 flows from the bottom to the top, forming a vertical forced circulation mixing; the water flow at the outlet 12 of the diversion cylinder will The gravel settled at the bottom of the wall of the reaction tank 1 is continuously pushed to the center of the reaction tank 1 . Specifically, a diversion tube 13 is arranged in the top of the reaction tank 1, and the diversion tube 13 is arranged horizontally. One end of the diversion tube 13 runs through the reaction tank 1 and communicates with the upper end of the diversion tube 3, and the other end of the diversion tube 13 extends to the reaction tank 1. In the center, the outlet 12 of the guide tube is located at the other end of the guide tube 13. Since the outlet 12 of the guide tube is located at a position where there is more biogas slurry and less gravel and anaerobic sludge, it is convenient for more biogas slurry to enter the guide tube 3. Reduce gravel and anaerobic sludge from entering the guide tube 3, and have high reliability.

As an example, in order to prevent gravel from being deposited at the bottom of the reaction tank 1 , a sand discharge pipe 6 is provided at the bottom of the reaction tank 1 and directly below the agitator 2 .

As an embodiment, in order to discharge the biogas slurry, the side wall of the reaction tank 1 is provided with a biogas slurry discharge port 7 , and the biogas slurry discharge port 7 is above the inlet 11 of the draft tube. Due to the centrifugal force and gravity generated by the agitator 2, the anaerobic sludge in the reaction tank 1 moves to the side wall and the bottom of the reaction tank 1, so the higher position and the more central position of the reaction tank 1 , the lower the concentration of anaerobic sludge. The top of the diversion tube 3 is the highest liquid level of the reaction tank 1, and the biogas slurry is discharged from this position, which is conducive to intercepting anaerobic sludge, effectively prolonging the residence time of the sludge, increasing the sludge concentration in the reaction tank 1, and improving the efficiency of the reaction tank. 1 volume load.

As an example, in order to facilitate the collection and discharge of biogas generated in the reaction tank 1 , a biogas collection port 8 is provided on the top of the reaction tank 1 .

As an embodiment, the flow impeller 4 includes a turbine blade, which is used to push the fluid in the guide tube 3 to flow from top to bottom, and the slurry inlet 5 is located above the turbine blade, which has a good effect.

As an embodiment, the number of the guide cylinder 3 is at least one. The number of guide tube 3 is one, as shown in Figure 2; the number of guide tube 3 is two, as shown in Figure 1, which can greatly increase the sludge concentration in the reaction tank and the volume load of the reaction tank. Anaerobic digestion reactors with agitator mechanical mixing improved by more than 50%.

Get by experiment, when the quantity of guide cylinder 3 is two, the volume load of the reaction tank 1 of this technical scheme can reach 7kgVSS/m3, and the volume load of the fully mixed reactor (CSTR) in the prior art No more than 3.5kgVSS/m3, the volume load has been doubled. It is very difficult to increase the volume load of the fully mixed reactor in the prior art.

Specifically, the principle of the present invention is to set up the agitator 2 in the reaction tank 1, and the materials are fully mixed in the horizontal direction, and the swirling flow will generate centrifugal force. Due to the density difference, the gravel and anaerobic sludge will move to the tank wall, and Settling down along the tank wall, the mud-water separation is realized to a certain extent in the reaction tank 1, the residence time of the anaerobic sludge in the reaction tank is prolonged, the sludge concentration in the reaction tank 1 is increased, and the reaction tank 1 is improved. The volume load of the reaction tank 1 is provided outside the reaction tank 1, and at the same time, a propeller 4 is provided in the flow guide tube 3. The upper and lower ends of the flow guide tube 3 are respectively connected with the reaction tank 1, and the biogas slurry at the top of the reaction tank 1 is pushed to the bottom of the reaction tank 1, and then the material in the reaction tank 1 flows from the bottom to the top, forming a vertical forced circulation mixing, which is mixed again by the agitator 2, which strengthens the mixing effect, promotes the occurrence of the reaction, and improves the anaerobic The digestion efficiency and gas production rate of the reaction are simple in structure. The reaction tank 1 of the technical solution is a high-load anaerobic digestion reactor for forced removal of sand accumulated by mechanical forced mixing, sludge retention time greater than hydraulic retention time.

Action process: 1. The rotation of the agitator 2 drives the liquid in the reaction tank 1 to form a horizontal swirl, and the materials are fully mixed in the horizontal direction; 2. The swirl will generate centrifugal force. Due to the density difference, the sand and anaerobic sludge will Move to the tank wall, and settle down along the tank wall, realize the separation of mud and water to a certain extent in the reaction tank 1, prolong the residence time of anaerobic sludge in the reactor; The biogas slurry at the top is pushed to the bottom of the reaction tank 1, and then the material in the reaction tank 1 flows from the bottom to the top, forming a vertical forced circulation mixing; 4. The water flow at the outlet 12 of the draft tube will settle on the wall of the reaction tank 1 The gravel at the bottom is continuously pushed to the center of the reaction tank 1 and discharged through the sand discharge pipe 6 to avoid the deposition of gravel. During this process, the sludge and the raw materials entering from the side wall of the draft tube 3 are initially mixed, Contact; then the mixture of sludge and raw materials at the bottom of the reaction tank 1 will move upward with the water flow, and be mixed again by the agitator 2, which strengthens the mixing effect.

On the basis of the above scheme, if the various modifications or deformations of the present invention do not depart from the spirit and scope of the present invention, if these modifications and deformations belong to the claims of the present invention and the equivalent technical scope, the present invention also intends to include these Alterations and Deformations.

Claims (10)

1. An organic waste anaerobic digestion reactor, comprising a reaction tank (1), characterized in that: it still includes:

the stirrer (2) is used for generating rotational flow in the horizontal direction, the stirrer (2) is arranged in the reaction tank (1), and a stirring shaft of the stirrer (2) is arranged along the central axis of the reaction tank (1);

the guide shell (3) is used for conveying biogas slurry at the top of the reaction tank (1) to the bottom of the reaction tank (1), the guide shell (3) is arranged outside the reaction tank (1), and the upper end and the lower end of the guide shell (3) are respectively communicated with the inside of the reaction tank (1);

the flow pusher (4) is used for providing power for the flow of fluid in the guide shell (3), and the flow pusher (4) is arranged in the guide shell (3);

the slurry inlet (5) is used for providing reaction raw materials for the reaction tank (1), and the slurry inlet (5) is communicated with the reaction tank (1).

2. The organic waste anaerobic digestion reactor of claim 1, characterized in that: the stirring shaft on be equipped with upper paddle (9) and lower floor's paddle (10) respectively, upper paddle (9) and lower floor's paddle (10) equal level set up, upper paddle (9) and lower floor's paddle (10) upper and lower two surfaces equal level.

3. The organic waste anaerobic digestion reactor of claim 1, characterized in that: draft tube (3) upper end be equipped with draft tube entry (11), draft tube entry (11) be located retort (1) top position and draft tube entry (11) be located the top of upper paddle (9).

4. The organic waste anaerobic digestion reactor of claim 3, characterized in that: the lower end of the guide shell (3) is provided with a guide shell outlet (12), the guide shell outlet (12) is arranged on the inner side wall of the reaction tank (1), and the guide shell outlet (12) is positioned below the lower paddle (10).

5. The organic waste anaerobic digestion reactor of claim 4, characterized in that: the reactor also comprises a sand discharge pipe (6) for discharging accumulated sand, wherein the sand discharge pipe (6) is arranged at the bottom of the reaction tank (1) and the sand discharge pipe (6) is positioned below the stirrer (2).

6. The organic waste anaerobic digestion reactor of claim 3, characterized in that: it still includes honeycomb duct (13), honeycomb duct (13) one end and draft tube (3) upper end intercommunication, honeycomb duct (13) other end stretch to agitator (2), draft tube entry (11) establish at honeycomb duct (13) other end.

7. The organic waste anaerobic digestion reactor of claim 3, characterized in that: it still includes natural pond liquid discharge port (7) that are used for discharging natural pond liquid, natural pond liquid discharge port (7) establish at retort (1) side and natural pond liquid discharge port (7) are located the top of draft tube entry (11).

8. The organic waste anaerobic digestion reactor of claim 1, characterized in that: the device also comprises a biogas collecting port (8) for collecting biogas, wherein the biogas collecting port (8) is arranged at the top of the reaction tank (1).

9. The organic waste anaerobic digestion reactor of claim 1, characterized in that: the guide shell (3) is respectively positioned at the left side and the right side of the reaction tank (1).

10. The organic waste anaerobic digestion reactor of claim 1, characterized in that: the slurry inlet (5) is arranged on the guide shell (3) and the slurry inlet (5) is positioned above the flow pusher (4).

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