CN2923711Y - Horizontal Mechanical Stirring Biogas Plant - Google Patents

Abstract

The utility model belongs to a solid organic waste treatment device, which is a horizontal mechanical stirring biogas device capable of adopting a high-concentration plug flow biogas fermentation process (HCF). It consists of a horizontal cylindrical tank, with a feed inlet at the top of the front end that allows solid organic waste and sewage to be fed directly without multi-stage "pretreatment", and a stirring shaft with blade rotation and a driving stirring shaft on the central axis Rotating low speed motor. Compared with a vertical biogas device fed by a liquid pump, the utility model has the advantages of energy saving, low investment, high gas production rate, simple operation and low operating cost, and is especially suitable for "ecological" biogas projects using livestock and poultry manure as raw materials.

Description

Horizontal Mechanical Stirring Biogas Plant

technical field

The utility model belongs to a solid organic waste treatment device and relates to a horizontal mechanical stirring biogas device adopting a high-concentration plug flow biogas fermentation process (HCF).

Background technique

At present, the use of biogas fermentation technology to treat solid organic waste (livestock and poultry manure and organic waste, etc.) mainly adopts a vertical biogas device fed by a liquid pump. 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 6%, so it is necessary to mix sewage 2 to 3 times the weight of the dry matter of the fermentation raw material, and multi-stage " "Pretreatment" to remove larger solids such as straw and feathers that block the liquid pump and pipeline. For this reason, one is to increase more than 30% of excess sewage heating to fermentation temperature (about 35 ℃ or 55 ℃) of heat energy consumption, also increased the discharge of biogas slurry and transportation costs. The second is that the multi-stage "pre-treatment" not only increases the project investment, but also increases the operation intensity and operating cost; and due to the limitation of the vertical structure of the device, the inexhaustible scum continuously accumulates in the air box on the top of the device Among them, it is difficult to remove and is not conducive to the escape of biogas; each new material added must be mixed with all the old materials, which will cause a small amount of unfermented fermented products to overflow in advance, making the effect of harmless treatment slightly worse.

Contents of the invention

In order to overcome the problems that the existing vertical biogas device that uses a liquid pump to feed can not greatly increase the feed concentration and the scum is difficult to remove, the utility model provides a horizontal mechanically stirred biogas device that can make solid organic waste and sewage separate It requires multi-stage "pre-treatment" and is directly added from the feed port, and the dry matter concentration of the feed can be increased to 10% to 15% under the action of mechanical agitation; and the rotating blades continuously break the scum and press it into the fermentation broth in and removed. It is a horizontal cylindrical tank with mechanical agitation, with 1 to 8 upper partitions and 2 to 9 lower partitions, and one of the two lower partitions is less than or equal to 50 meters from the top of the tank. The upper partition with a gap of one centimeter, the top of the front end has a bottom mouth that matches the feeding equipment and extends into the feeding mouth that is 30-60 cm below the fermentation liquid surface, and the feeding mouth is matched with the heating equipment and leads into the tank The lower part of the heating pipe, the top of the middle end has a gas collecting hood, the bottom of the top of the rear end has an overflow pipe extending 20 to 50 cm below the surface of the fermentation liquid, and the rear end has a discharge pipe 50 to 100 cm below the central axis of the tank. The slag valve and the manhole located on the central axis of the tank are convenient for equipment installation and maintenance; the stirring shaft with 5 to 19 rotating blades is located on the central axis of the tank and is erected on the lower partition through 2 to 5 bearing seats. One end of the shaft is docked with the coupling and the low-speed motor outside the tank through the sealing seat at the front end of the tank; after the top of the blade is bent forward, the included angle with the vertical surface of the central axis of the tank is less than or equal to 90 degrees and the gap with the tank is less than or equal to equal to 50 centimeters. Compared with the vertical biogas device fed by a liquid pump, the horizontal mechanical stirring biogas device proposed by the utility model can save more than 30% of heat energy, reduce engineering investment by 20% to 30%, and increase the gas production rate by 30% at the same fermentation temperature. % or more, easy to operate, low operating costs and suitable for the treatment of various solid organic wastes, especially suitable for "ecological" biogas projects that use livestock and poultry manure as raw materials and comprehensive utilization of biogas.

Description of drawings

Accompanying drawing is the structural representation of the utility model.

In the figure 1, feed inlet, 2, tank body, 3, heating pipe, 4, upper partition, 5, gas collecting hood, 6, overflow pipe, 7, manhole, 8, slag discharge valve, 9, lower Partition plate, 10, blade, 11, stirring shaft, 12, bearing seat, 13, sealing seat, 14, shaft coupling, 15, low-speed motor.

Detailed ways

In the accompanying drawings, solid fermentation raw materials, especially livestock and poultry manure can be directly added to the feed inlet 1, and a certain amount of blending sewage is added at the same time, and the blades on the stirring shaft 11 are driven by the low-speed motor 15 through the coupling 14 and the sealing seat 13. Under the stirring action of 10, mix it into a high-concentration fermented liquid. The fermented liquid is heated by the heating pipe 3, and under the guidance of the lower partition 9 and the upper partition 4, the upper and lower baffles continuously move to the rear end of the tank body 2. Under the agitation of the bent blades at the top, the sediment is turned up and the scum is broken up and pressed into the fermentation broth. The generated biogas is output through the gas collecting hood 5, the biogas liquid overflows automatically from the overflow pipe 6, and the biogas residue is discharged through the slag discharge valve 8 at regular intervals.

The material of the tank body 2 of the present utility model can be a steel structure, a reinforced concrete structure or a brick-concrete structure, and thermal insulation facilities are arranged. The concrete surface in the tank body 2 is all sealed, and air and water must not leak; all metal components are painted with anti-corrosion paint.

Claims (2)

1. A horizontal mechanical stirring biogas device, characterized in that the tank body (2) is a horizontal cylinder with a stirring shaft (11) that rotates with blades (10) on its central axis, and the top of the front end has a The bottom mouth of the material equipment is matched with the feeding port (1) that extends into the 30-60 cm below the fermentation liquid level, and there are 1-8 upper partitions (4) and 2-9 lower partitions (9) in the tank body (2). ), there is an upper partition (4) with a gap equal to or less than 50 cm from the top of the tank body between the two lower partitions (9), and there is a heating device next to the feed port (1) that is connected to the tank body The heating pipe (3) in the lower part has a gas collecting hood (5) at the top of the middle end, and the overflow pipe (6) at the top of the rear end extends into 20-50 cm below the surface of the fermentation liquid, and the end surface of the rear end has a bottom opening that is lower than the tank. A slag discharge valve (8) with a central axis of 50 to 100 cm and a manhole (7) located on the central axis of the tank body. 2. The horizontal mechanical stirring biogas device according to claim 1, characterized in that the rotating speed of the stirring shaft (11) is equal to or less than 100 rpm; The included angle of the central axis elevation is less than or equal to 90 degrees and the gap with the tank body (2) is less than or equal to 50 centimeters.

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