CN202099280U - Horizontal continuous dry fermentation methane device for straws - Google Patents

Abstract

The utility model belongs to a solid organic waste treatment device based on straw, and is a horizontal continuous dry fermentation biogas device capable of adopting continuous and dry fermentation processes. It consists of a horizontal cylindrical tank, with a stirring shaft with blades on the central axis or two stirring half shafts with blades at the front and rear and a deceleration motor driving its rotation, and a feeder connected to a positive displacement pump at the front end There is an air collecting hood on the top, and a discharge port connected to the positive displacement pump at the rear end. The utility model has the advantages of high gas production rate, energy saving, easy automation and no "secondary pollution", and is especially suitable for bioenergy projects using straw as the main raw material.

Description

Straw horizontal continuous dry fermentation biogas plant

technical field

The utility model belongs to a straw-based solid organic waste treatment device, and relates to a straw horizontal continuous dry fermentation methane device adopting a continuous dry fermentation process (CDPF).

Background technique

At present, the use of biogas fermentation technology to treat solid organic waste mainly composed of straw mainly adopts vertical biogas devices fed by centrifugal pumps. Due to the limitation of the performance of the liquid pump, the dry matter concentration (TS%) of the feed to the device can only be less than or equal to 10%. For this reason, one is that the scum floats on the crushed straw and continuously accumulates in the air box at the top of the device, which is difficult to remove and is not conducive to the escape of biogas. The second is that it is difficult to effectively stir and mix the scum, so the utilization rate of raw materials and the gas production rate of the tank are low. The third is that it is necessary to mix 3 to 4 times the weight of sewage as the fermentation raw material, which increases the heat energy consumption of heating the excess sewage to the fermentation temperature (about 35°C or 55°C), and also increases the discharge of biogas slurry and transportation costs. Fourth, if the discharged biogas slurry cannot be fully utilized, it will cause secondary pollution; the "horizontal mechanical stirring biogas device" (patent number ZL 200520142327.9) is adopted, because there is no forced feeding and discharging equipment and the axial arrangement of the blades is different , so that the dry matter concentration (TS%) is 20% to 40% of the fermentation raw material is difficult to enter the tank and constantly creeps to the rear end.

Contents of the invention

In order to overcome the problems that the existing vertical biogas device that mainly handles straw cannot greatly increase the feed concentration, the scum is difficult to remove, and the "horizontal mechanical stirring biogas device" (patent number ZL 200520142327.9) cannot further increase the feed concentration. , the utility model provides a horizontal biogas device for continuous and dry fermentation process, the pressure generated by the displacement pump 15 can increase the dry matter concentration of the feed to 20% to 40%; the blades 10 arranged in an axial spiral are continuously rotating The fermented material is turned up and down and wriggled toward the rear end of the tank body 4 . It is a horizontal cylindrical tank 4 with mechanical agitation. The front end has a feed inlet 14 connected to the 1# volumetric pump 15, the top has 1 to 10 gas collecting hoods 5, and the rear end has a 2# volume pump. The outlet 9 connected to the pump 8 and the 1# manhole 6 or 2# manhole 7 located at the top or rear end are convenient for installation and maintenance of the equipment; there is a stirring shaft 13 on the central axis of the tank body 4 or there are front, The last two stirring half shafts 16 are erected on the support 12 through 2 to 10 bearing seats 11, and the stirring shaft 13 or the front and rear two stirring half shafts 16 have 6 to 42 blades 10 arranged in an axial spiral, One end of the stirring shaft 13 or the front and rear two stirring half shafts 16 is connected with the coupling 2 outside the tank body 4 and the reducer 1 through the sealing seat 3 of the tank body 4, and the stirring shaft 13 or the front and rear two stirring halves The rotational speed of the shaft 16 is equal to or less than 10 rpm. Compared with the vertical biogas device fed by the centrifugal pump and the horizontal mechanical stirring biogas device, the straw horizontal continuous dry fermentation biogas device proposed by the utility model has a higher tank capacity at the same fermentation temperature (about 35°C or 55°C). The gas rate is increased by 100-200%, heat energy is saved by 30-70%, there is no "secondary pollution" caused by the discharge of biogas slurry, the operation is easy to automate, and it is suitable for the treatment of various solid organic wastes, especially for straw as the main raw material. Bioenergy Engineering.

Description of drawings

Accompanying drawing 1 and accompanying drawing 2 are structural representations of the utility model.

In the figure 1. Geared motor, 2. Coupling, 3. Sealing seat, 4. Tank body, 5. Gas collecting hood, 6. 1# manhole, 7. 2# manhole, 8. 2# positive displacement pump, 9. Discharge port, 10. Blade, 11. Bearing seat, 12. Bracket, 13. Stirring shaft, 14. Feed port, 15. 1# positive displacement pump, 16. Stirring half shaft.

Detailed ways

Embodiment one

In the accompanying drawing 1, the fermented raw materials mainly composed of crushed straw are blended with a certain amount of sewage, and then pumped into the front end of the tank body 4 by the 1# volumetric pump 15 through the feed port 14 and passed through the coupling 2 and the geared motor 1. The sealing seat 3 drives the rotating stirring of the stirring shaft 13 with the blade 10, and the fermented product is turned up and down and continuously wriggles towards the rear end of the tank body 4. The fermented product is heated during turning, and the generated biogas is output through the gas collecting hood 5, and the biogas residue liquid is discharged through the discharge port 9 by the 2# positive displacement pump 8. The stirring shaft 13 is erected on the bracket 12 through the bearing seat 11, and the 1# manhole 6 at the top and the 2# manhole 7 at the rear end are convenient for installation and maintenance of the equipment.

Embodiment two

In accompanying drawing 2, after mixing the solid fermentation raw material based on crushed straw with a certain amount of sewage, the 1# volumetric pump 15 is pumped into the front end of the tank body 4 through the feed port 14 and one set is used at the front and rear ends respectively. The reduction motor 1 respectively drives the front and rear two stirring half shafts 16 with the blade 10 to rotate in the same direction through the coupling 2 and the sealing seat 3. Under stirring, the fermented product is turned up and down and continuously creeps to the rear end of the tank body 4 . The fermented product is heated during turning, and the generated biogas is output through the gas collecting hood 5, and the biogas residue liquid is discharged through the discharge port 9 by the 2# positive displacement pump 8. The front and rear two stirring half shafts 16 are erected on the bracket 12 through the bearing housing 11, and the 1# manhole 6 at the top is convenient for installation and maintenance of the equipment.

In accompanying drawing 1 and accompanying drawing 2, the material of tank body 4 of the present utility model can be steel structure or reinforced concrete upper structure, and insulation facility is arranged. The concrete surface in the tank body 4 is all sealed, and air and water must not leak; the metal components are all brushed with anti-corrosion paint.

Claims (3)

1. A straw horizontal continuous dry fermentation biogas device, characterized in that the tank body (4) is a stirring shaft (13) with a blade (10) on its central axis or two front and rear blades with The stirring half shaft (16) of the blade (10) is connected with the shaft coupling (2) and the reducer (1) outside the tank body (4) through the sealing seat (3) of the tank body (4) and the stirring shaft (13 ) or a horizontal cylinder with front and rear two stirring half-shafts (16) erected on the bracket (12) through 2 to 10 bearing seats (11), and the front end has a 1# positive displacement pump (15) for feeding Feed port (14), the top has gas collecting cover (5), and the discharge port (9) of useful 2# positive displacement pump (8) discharge in the rear end. 2. The straw horizontal continuous dry fermentation biogas device according to claim 1, characterized in that the rotating speed of the stirring shaft (13) or the front and rear two stirring half shafts (16) is equal to or less than 10 rpm and 6～ 42 blades (10) are arranged in an axial spiral. 3. The straw horizontal continuous dry fermentation biogas device according to claim 1, characterized in that there are 1 to 10 gas collecting hoods on the top.

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