CN212174935U - Horizontal plug flow type continuous dry fermentation device - Google Patents

Abstract

The utility model discloses a horizontal plug flow type continuous dry fermentation device, which relates to the technical field of material fermentation and comprises a fermentation device body, wherein the top of the front end of the fermentation device body is provided with a feed inlet, and the bottom of the rear end of the fermentation device body is provided with a discharge outlet; the outer wall of the fermentation device body is provided with a heat preservation device, the interior of the fermentation device body is provided with a stirring device, the stirring device comprises a stirring shaft and a stirrer, the stirring shaft is arranged in the middle of the fermentation device body in parallel, the stirring shaft is connected with a driving device, and the stirring shaft is provided with a plurality of stirrers; the fermentation device body comprises a plurality of fermentation device modules which are detachably connected, and the plurality of fermentation device modules are sequentially communicated; the top of the fermentation device module is connected with a biogas pipe. The utility model discloses well mixing material strengthens the inside mass transfer heat transfer of fermenting installation, improves anaerobic digestion system stability and efficiency, adopts modular mosaic structure, is convenient for assemble, change, make, maintain and overhaul.

Description

A cross-flow continuous dry fermentation device

technical field

The utility model relates to the technical field of material fermentation, in particular to a transverse thrust flow continuous dry fermentation device.

Background technique

The output of agricultural waste in my country is huge. The annual harvestable amount of crop straw is 900 million tons and livestock and poultry manure is 3.8 billion tons. It not only has potential threats to the living environment, but also contains a lot of resource potential. The use of anaerobic fermentation to treat wastes with high organic content such as livestock and poultry manure and crop straw can not only promote the harmless and reduced treatment of organic wastes, but also realize the utilization of resources and energy, and produce clean energy. Promote the improvement of the energy structure, improve the living environment in rural areas, and ultimately achieve sustainable economic and social development in rural areas.

At present, the anaerobic fermentation technology is mainly based on traditional wet fermentation, and the moisture content of the material is generally above 90%. On the one hand, in order to meet the medium or high temperature conditions required for fermentation, all organic matter and water need to be heated, which greatly increases energy consumption; At the same time, a large amount of biogas slurry is difficult to be absorbed, which is easy to cause secondary pollution. Dry fermentation technology has attracted more and more attention due to its advantages of high concentration of fermented materials, wide adaptability of raw materials, and basically no biogas slurry. Dry fermentation technology can be divided into batch and continuous fermentation technology according to the feeding and discharging and operation mode.

The batch type dry fermentation technology adopts the batch fermentation form of all-in and all-out. A typical batch type dry fermentation system is shown in Figure 1. This system adopts the batch type batch fermentation form, and the gas production is discontinuous, and due to the staged and intermittent production In order to overcome the above problems, multiple fermentation units are usually set up to minimize the fluctuation of gas production, but at the same time, a large amount of The land is used for the storage and pretreatment of raw materials.

Continuous anaerobic dry fermentation technology is a newly emerging anaerobic fermentation technology. Compared with sequencing batch dry anaerobic fermentation technology, this technology has the advantages of continuous and stable gas production and high dry matter degradation rate. As shown in Figure 2 and Figure 3, there are currently two main types of continuous anaerobic dry fermentation devices, one is vertical push flow (vertical), the other is horizontal push flow (horizontal). There are many application cases, and domestic applications are relatively few. However, these devices are mainly used for the treatment of municipal solid waste. For the organic wastes such as livestock and poultry manure, crop straw, etc. produced in large quantities in my country, their adaptability is poor, and due to the poor fluidity of materials with high solid content, the vertical Flow continuous dry fermentation equipment is difficult to manufacture and install. When the solid content of the material is high, problems such as difficulty in feeding and discharging materials, short service life of the feeding and discharging equipment, and poor operation stability are likely to occur; horizontal continuous dry fermentation equipment usually adopts the central The shaft screw conveying method has small monomer volume, uneven stirring, difficult mass transfer, and is prone to imbalance of microbial habitat environment.

Therefore, there is an urgent need to provide a new cross-flow continuous dry fermentation device to solve the above problems existing in the prior art.

Utility model content

The purpose of this utility model is to provide a cross-flow continuous dry fermentation device, in order to solve the problems existing in the above-mentioned prior art, fully mix the materials, strengthen the mass transfer and heat transfer inside the fermentation device, and improve the stability of the anaerobic digestion system And efficiency, the modular splicing structure is adopted, which is easy to assemble, replace, manufacture, maintain and repair.

In order to achieve the above purpose, the utility model provides the following scheme: the utility model provides a cross-flow continuous dry fermentation device, which includes a fermentation device body, and a feed port is provided at the top of the front end of the fermentation device body, and the fermentation device A discharge port is arranged at the bottom of the rear end of the device body; a heat preservation device is arranged on the outer wall of the fermentation device body, and a stirring device is arranged inside the fermentation device body, and the stirring device includes a stirring shaft and a stirrer. The stirring shaft is arranged in parallel in the middle of the fermentation device body, the stirring shaft is connected with a driving device, and a plurality of the stirrers are arranged on the stirring shaft; the fermentation device body includes several detachably connected fermentation devices modules, several fermentation device modules are connected in sequence; the top of the fermentation device modules is connected with a biogas pipe.

Preferably, the stirrer includes a plurality of stirring arms, and the plurality of stirring arms are radially arranged on the stirring shaft; one end of the plurality of stirring arms away from the stirring shaft is connected by a support ring.

Preferably, a stirring blade or no stirring blade is provided on the stirring arm, and the stirring blade forms an angle with the longitudinal direction of the fermentation device body.

Preferably, the adjacent stirrers are separated by 3 to 4 meters, and the longitudinal included angle between the stirring blade and the fermentation device body is 135° to 175°.

Preferably, the fermentation device module includes a first fermentation device module and a second fermentation device module, and a third fermentation device module is disposed between the first fermentation device module and the second fermentation device module.

Preferably, the feeding port is provided with a feeding device, the top of the feeding device is provided with a hopper, and the discharging port is provided with a discharging device.

Preferably, the feeding device is a star-shaped feeder, and the discharging device is a variable-diameter screw discharger, and the diameter of the variable-diameter screw discharger gradually decreases from top to bottom.

Preferably, a discharging well is provided below the discharging device, and a screw conveyor is connected to the discharging well.

Preferably, the inner bottom of the fermentation device body is provided with a support frame for supporting the stirring shaft, and the stirring shaft is rotatably connected to the top of the support frame.

The utility model has achieved the following technical effects with respect to the prior art:

1. Realize continuous dry fermentation, good mass transfer effect, uniform stirring, stable system and low operating cost;

2. Reduce the difficulty of manufacturing and installation, facilitate transportation, and can assemble modules according to needs;

3. The fermentation unit modules in the middle part are spare tanks for each other, which can realize quick replacement or maintenance, and have strong anti-risk ability;

4. The feeding device is simple, efficient and effective;

5. Realize the normal discharge of high-concentration materials, and it is not easy to block.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only of the present invention. For some embodiments of the present invention, for those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

Fig. 1 is the structural representation of batch type dry fermentation device in the prior art;

Fig. 2 is the structural representation of the vertical continuous dry fermentation device in the prior art;

Fig. 3 is the structural representation of the horizontal continuous dry fermentation device in the prior art;

Fig. 4 is the structural representation of the cross-flow continuous dry fermentation device in the utility model;

Fig. 5 is the structural representation of the agitator in the utility model;

Wherein, 1 is the feeding device, 2 is the fermentation device body, 3 is the biogas pipe, 4 is the discharging device, 5 is the screw conveyor, 6 is the discharging well, 7 is the stirrer, 8 is the stirring shaft, and 9 is the first A fermentation device module, 10 is a support frame, 11 is a second fermentation device module, 7.1 is a support ring, 7.2 is a stirring arm, and 7.3 is a stirring blade.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

In order to make the above objects, features and advantages of the present utility model more clearly understood, the present utility model will be described in further detail below with reference to the accompanying drawings and specific embodiments.

Example 1

As shown in FIGS. 4 and 5 , this embodiment provides a cross-flow continuous dry fermentation device, including a fermentation device body 2 , a feeding port is provided at the top of the front end of the fermentation device body 2 , and the fermentation device body 2 A discharge port is provided at the bottom of the rear end of the fermentation device; the outer wall of the fermentation device body 2 is provided with a heat preservation device. Specifically, the heat preservation device includes a heating coil arranged inside the outer wall of the fermentation device body 2 to ensure the required Medium-temperature or high-temperature fermentation conditions, wherein, the heating coil generally adopts a hot water pipe, and a steam pipe can also be used; the fermentation device body 2 is provided with a stirring device inside, which can actively push materials, and the stirring device includes a stirring shaft 8 and a Stirrer 7, the stirring shaft 8 is arranged in parallel in the middle of the fermentation device body 2, and is rotatably connected with the fermentation device body 2, the stirring shaft 8 is connected with a driving device, and the driving device can use a driving motor, etc. The stirring shaft 8 is provided with a plurality of the agitators 7 for stirring and mixing the materials in the fermentation device; the fermentation device body 2 is a horizontally elongated canned structure with a modular structure, including several A detachable connected fermentation device module, several fermentation device modules are connected in sequence; a biogas pipe 3 is connected to the top of the fermentation device module.

In this embodiment, the fermentation device module includes a first fermentation device module 9 and a second fermentation device module 11. The first fermentation device module 9 is used for receiving organic materials such as livestock and poultry manure and straw, and the second fermentation device module 11. A material outlet is provided; between the first fermentation device module 9 and the second fermentation device module 11, a number of third fermentation device modules can also be arranged, which are spliced longitudinally; during splicing, the left fermentation device module The steel plate and the steel plate of the right fermentation device module are symmetrically butted, and the left and right module steel plates are connected with pressure plates on both sides, and the pressure plates and the left and right module steel plates are fixed by bolts and nuts (bolts can be of different specifications and Arrangement), sealing rubber or sealant is provided between the pressure plate and the left and right module steel plates, and a gasket is arranged between the nut and the pressure plate; since the splicing module steel plates adopt longitudinal and horizontal butt joints, and then pass the pressure plate, bolts and seals The rubber is connected, fixed and sealed to form a splicing. Therefore, the forces in the left and right directions of the connecting and fixing bolts are at the same force point to avoid the generation of shear force; the third fermentation device module in the middle part is a spare tank for each other. , it can realize quick replacement or maintenance, and has strong anti-risk ability.

In this embodiment, a modular splicing structure is adopted, which is convenient for assembly, replacement, manufacture, maintenance and repair; the number of fermentation device modules can be set according to the requirements of parameters such as material characteristics and residence time; it is convenient for transportation and installation, and the construction period is short.

In this embodiment, the stirrer 7 includes a plurality of stirring arms 7.2, and the plurality of stirring arms 7.2 are radially arranged on the stirring shaft 8; The support ring 7.1 is connected, and the support ring 7.1 is used to increase the strength of the stirring arm 7.2.

When the stirrer 7 rotates, the stirring arm 7.2 is used to mix the materials, and the stirring blade 7.3 is installed on the stirring arm 7.2. The stirring blade 7.3 is angled with respect to the longitudinal direction of the fermentation device body 2, and is used to move along the fermentation device when the stirrer 7 rotates. The longitudinal movement of the body 2 organic material. Therefore, the stirring arm 7.2 can act as a propeller blade for conveying materials in the longitudinal direction of the fermentation device body 2, and through the design of the stirring blade 7.3, the relationship between the conveying effect and the mixing effect can be adjusted. A stirring blade 7.3 or no stirring blade 7.3 may be provided on the stirring arm 7.2 as required. (The stirrers 7 are separated by 3 to 4 meters, and the vertical angle between the stirring blades 7.3 and the fermentation device body 2 is 135° to 175°).

In this embodiment, the agitator 7 with the above structure can be used to mix the materials evenly, strengthen the mass transfer and heat transfer inside the fermentation device, improve the stability and efficiency of the anaerobic digestion system, and shorten the hydraulic retention time of the materials.

In this embodiment, the feeding port is provided with a feeding device 1 , the top of the feeding device 1 is provided with a hopper, and the discharging port is provided with a discharging device 4 .

Specifically, the feeding device 1 is a star-shaped feeder, and the cross-section of the star-shaped feeder can be in the shape of a plurality of corners (a five-pointed star in FIG. 4 ), which is used for feeding and connecting the fermenter with the The outside is sealed and isolated; the feeding device 1 has a simple structure, high efficiency and good effect.

The discharging device 4 is a variable-diameter screw discharger or adopts an existing similar variable-diameter spiral auger structure, and the diameter of the variable-diameter screw discharger gradually decreases from top to bottom; the discharging device 4 A discharge well 6 is arranged below the discharge well 6, and a screw conveyor 5 is connected to the discharge well 6. The material is firstly discharged out of the fermentation device body 2 through the variable diameter screw discharger (the diameter gradually decreases from top to bottom), and then further discharged through the screw conveyor 5 to realize the normal discharge of high-concentration materials without clogging.

In this embodiment, a support frame 10 is provided at the inner bottom of the fermentation apparatus body 2 for supporting the stirring shaft 8 , and the stirring shaft 8 is rotatably connected to the top of the support frame 10 .

The present embodiment also discloses a cross-flow continuous dry fermentation method, comprising the following steps:

Step 1, install the fermentation device body;

Step 2: Load the organic waste into the hopper of the feeding device according to a fixed ratio every day;

In this embodiment, organic wastes such as livestock and poultry manures, crop straws, and horticultural wastes are processed. Among them, long-sized materials such as crop straws and horticultural wastes need to be pulverized, and the pulverized particle size is generally 1-3 cm;

Step 3. After the organic waste is filled to a certain height (reaching the "material seal" state), open the star feeder of the feeding device, and transport the organic waste into the fermentation device body;

Step 4. Under the action of the agitator, the organic waste is fully mixed and uniform, and under the action of the stirring blade, the organic waste is moved from the first fermentation device module to the second fermentation device module;

During the fermentation process, under the action of the stirrer, the material is fully mixed and evenly mixed, and under the action of the stirring blade, it slowly moves from one end of the fermentation device body to the other end, and can be set according to the characteristics of the material. The residence time in the body, and then set the rotational speed, frequency, etc. of the agitator;

Step 5. Maintain the temperature conditions required for anaerobic fermentation by the heat preservation device, specifically maintaining the medium temperature (about 35-40°C) or high temperature (55-60°C) conditions required for anaerobic fermentation; The biogas is collected and utilized through the biogas pipe;

Step 6: The fermented organic waste is discharged to the discharge well through the discharge device, and discharged through the screw conveyor.

During the production process, the materials are fed regularly every day, and the anaerobic fermentation process continues, realizing the continuous treatment and utilization of organic wastes; since the materials can maintain continuous movement at an appropriate speed, the residence time of the materials can be significantly shorter than that of the batch fermenter, The processing efficiency of materials is higher, and the physical space required for material storage, fermentation and other links is smaller.

The utility model of the cross-plug flow continuous dry fermentation device and method is guided by industrial application, realizes full mixing of inoculum and substrate, improves mass transfer and heat transfer efficiency, and realizes high-efficiency and stable operation. Engineering applications provide basic and reference data.

Specific examples are used in the present invention to illustrate the principles and implementations of the present invention. The descriptions of the above embodiments are only used to help understand the methods and core ideas of the present invention; at the same time, for those skilled in the art , according to the idea of the present utility model, there will be changes in the specific implementation and application scope. In conclusion, the content of this specification should not be construed as a limitation on the present invention.

Claims (9)

1. A cross-flow type continuous dry fermentation device comprises a fermentation device body, wherein a feeding hole is formed in the top of the front end of the fermentation device body, and a discharging hole is formed in the bottom of the rear end of the fermentation device body; the method is characterized in that: the fermentation device comprises a fermentation device body, wherein a heat preservation device is arranged on the outer wall of the fermentation device body, a stirring device is arranged inside the fermentation device body, the stirring device comprises a stirring shaft and stirrers, the stirring shaft is arranged in the middle of the fermentation device body in parallel, the stirring shaft is connected with a driving device, and a plurality of stirrers are arranged on the stirring shaft; the fermentation device body comprises a plurality of fermentation device modules which are detachably connected, and the plurality of fermentation device modules are sequentially communicated; the top of the fermentation device module is connected with a biogas pipe.

2. The cross-flow continuous dry fermentation device of claim 1, wherein: the stirrer comprises a plurality of stirring arms which are radially arranged on the stirring shaft; and one ends of the stirring arms far away from the stirring shaft are connected through a support ring.

3. The cross-flow continuous dry fermentation device of claim 2, wherein: stirring arm is last to be provided with stirring vane or not to set up stirring vane, stirring vane with the vertical angularity of fermenting installation body.

4. The lateral plug-flow continuous dry fermentation device of claim 3, wherein: the adjacent stirrers are separated by 3-4 meters, and the longitudinal included angle between each stirring blade and the fermentation device body is 135-175 degrees.

5. The cross-flow continuous dry fermentation device of claim 1, wherein: the fermentation device module comprises a first fermentation device module and a second fermentation device module, and a third fermentation device module is arranged between the first fermentation device module and the second fermentation device module.

6. The cross-flow continuous dry fermentation device of claim 1, wherein: the feed inlet is provided with feed arrangement, and feed arrangement's top is provided with the hopper, the discharge gate is provided with discharging device.

7. The lateral plug-flow continuous dry fermentation device of claim 6, wherein: the feeding device is a star-shaped feeder, the discharging device is a variable-diameter spiral discharger, and the diameter of the variable-diameter spiral discharger is gradually reduced from top to bottom.

8. The cross-flow continuous dry fermentation device of claim 7, wherein: and a discharging well is arranged below the discharging device and is connected with a screw conveyor.

9. The cross-flow continuous dry fermentation device of claim 1, wherein: the inner bottom of the fermentation device body is provided with a support frame used for supporting the stirring shaft, and the stirring shaft is rotatably connected with the top of the support frame.

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