WO2016041411A1

WO2016041411A1 - Large-scale viscous semi-solid homogeneous material propeller and application

Info

Publication number: WO2016041411A1
Application number: PCT/CN2015/084554
Authority: WO
Inventors: 杨宏
Original assignee: 北京工业大学
Priority date: 2014-09-17
Filing date: 2015-07-21
Publication date: 2016-03-24
Also published as: CN104355066A; CN104355066B

Abstract

Disclosed is a large-scale viscous semi-solid homogeneous material propeller and application, which belong to the technical field of dry type biogas fermentation material propulsion. The propeller comprises long-shaft propulsion impellers (1), propeller driving shafts (2), and propeller housings (4), wherein the long-shaft propulsion impellers (1) are elongated in the impeller vane driving shaft direction, the section perpendicular to the axial direction has a dumbbell-shaped structure, and two ends and the middle of the dumbbell-shaped structure are all arc-shaped; each long-shaft propulsion impeller (1) is installed with a propeller driving shaft (2), the two long-shaft propulsion impellers (1) have parallel shafts (2), and can rotate respectively along respective shafts (2), rotating directions of the two long-shaft propulsion impellers (1) are opposite, and surfaces of two vane impellers (1) remain meshed and sealed all the time; and a propeller housing (4) is arranged on the outer face of each long-shaft propulsion impeller (1), so that each long-shaft propulsion impeller (1) is tangential to a corresponding semi-cylindrical cavity all the time during the rotation process. The two impellers have mutual unloading and removal effects, and have a relatively good propulsion effect on the viscous semi-solid homogeneous material.

Description

Large viscous semi-solid homogeneous material propeller and application thereof

Technical field

The invention belongs to the technical field of dry biogas fermentation material propulsion, and particularly relates to a horizontal large-scale continuous biogas dry fermentation large-sized viscous semi-solid homogeneous material propeller.

Background technique

In the large-scale biogas fermentation process device, due to the large volume of the fermentation material, it is difficult to achieve uniform propulsion of the viscous homogeneous material, which makes the fermentation of the “new” and “old” materials in the operation of the fermentation device, resulting in incomplete fermentation of the material and effective fermentation tank. The volume utilization rate is low, the dead zone in the fermentation tank, and the fermentation chamber are prone to acidification. In addition, due to the lack of effective large quantities of materials, the equipment is slowly and evenly propelled, resulting in a limited capacity for the construction of large dry fermentation tanks. Continuous dry fermentation of viscous materials (such as urban dewatered sludge moisture content of 80%) is still worldwide. It is a problem in this field.

In view of the above situation, the present invention designs a large material propulsion device capable of achieving uniform and slow propulsion for viscous semi-solid materials.

Summary of the invention

This invention draws on the working principle of the Roots blower for gas pressurization. The Roots blower has a double or triple blade form, and the two sets of impellers are relatively rotated in the fan casing by two drive shafts. In the work, the gas is transferred from one side (low pressure zone) to the other side (high pressure zone) through the seal design of the impeller and the impeller, the impeller and the fan casing, and the high speed rotation of the impeller. During this rotation process, the arc between the two vane impellers, the vane impeller and the fan casing through the surface of the fin impeller (outer involute and inner involute) is designed to achieve high-speed rotation. The mutual sealing and the action of the pressurized gas enable the Roots blower to achieve gas pressurization, thereby forming a high pressure zone.

For the viscous semi-solid homogeneous material, the large viscous semi-solid homogeneous material propeller of the present invention comprises two long-axis propulsion impellers (1) and two propeller drive shafts (2) ), thruster housing (4).

The long-axis propulsion impeller (1) has a long cylindrical structure as a whole, that is, an impeller with an axial length, that is, an elongated design along the driving axis in the design of the impeller fin (see Fig. 2), the vertical axis The cross section of the dumbbell is a dumbbell-shaped structure, and both ends of the dumbbell-shaped structure and the intermediate outer surface are curved; each long-axis propeller (1) has a propeller drive shaft (2), and two long-axis types. The axes of the propeller (1) are parallel to each other, and the two impellers rotate in opposite directions with their respective axes as the center, and the rotation of the two long-axis propellers (1) In the opposite direction, one clockwise, one counterclockwise, during the rotation process, the two vane impeller surfaces are always kept in a relative snap seal; a propeller housing (4) is provided outside each long-axis propeller (1) for propulsion The inner surface of the housing (4) is a semi-circular cavity such that each long-axis propulsion impeller (1) is always tangent to the corresponding semi-circular cavity inner wall during rotation.

The rotating speed of the long-shaft type propulsion impeller (1) of a large viscous semi-solid homogeneous material propeller of the invention adopts a low number of revolutions, and can be realized in combination with the material pool (fermentation tank) structure design (see Fig. 3). The slow advancement of the material is called a guide.

A large viscous semi-solid homogeneous material propeller of the present invention is used for viscous semi-solid material propulsion, and the outer surface of the propeller casing (4) is provided with a barrier to make a barrier (such as a fermenter concrete floor 6; fermentation The concrete compartment partition 7) and the propeller jointly divide the space barrier on both sides of the propeller into two parts. With the relative rotation of the two long-axis propellers (1), the viscous semi-solid material follows the long axis type. The rotation of the impeller (1) is transported from one side space to the other side space.

The following is a detailed description with reference to the accompanying drawings: First, the working principle is shown in FIG.

For convenience of description, two long-axis propulsion impellers are respectively labeled as AB impeller and CD impeller, and the ends of the impeller are marked with A, B, C, and D symbols to show the impeller rotation state. The material regions are indicated by symbols (1), (2), (3), (4), (5), (6), (7). From Fig. 1 to Fig. 9, the two impellers complete the relative 360° synchronous rotation, and the (1), (2), (3), (4) regions are completed in the whole process. The advancement of the material from the right to the left in the figure. As can be seen from the figure, in the process of guiding the material from the right side to the left side of the fin impeller, for example, the fin impeller AB starts from the material of (1) in Fig. 3, because the material (1) has adhesion to the impeller AB, if it is separate When the impeller AB rotates, the material in the (1) zone will return to the right side with the impeller rotation. However, in the state where the double impeller rotates synchronously, the D end of the CD impeller in Fig. 3, the (1) zone attached to the impeller AB The material has a scavenging effect, so as the two impellers continue to rotate relative to each other, the two impellers have a discharge clearing effect on each other. Based on the above principle, the viscous semi-solid material propeller built on the basis of the principle of the process has a good propelling effect on the materials of the above properties.

In the setting mode, the propeller is arranged at the bottom of the fermentation compartment partition wall, and when the installation is carried, the pusher inlet sinks into the bottom of the fermentation tank, and the inlet lower edge is flush with the bottom of the fermentation tank, thus avoiding the bottom dead zone. The material of the fermentation chamber is continuously sinking under the action of its own gravity, and is continuously introduced into the next compartment by the propeller, thereby completing the propulsion process of the whole material; the edge between the two propeller casings on the same side is the inlet, and the other side is propelled. The edge between the outer casings is the outlet, and the material is directed from the inlet to the outlet.

DRAWINGS

Figure 1 Schematic diagram of the structure of the propeller;

Figure 2 Schematic diagram of the structure and working principle of the propeller;

Figure 3 is a schematic view showing the overall shape of the long axis type propulsion impeller;

Figure 4 is a schematic plan view showing the installation of the propeller in the fermentation tank;

Figure 5 is a diagram of the pusher installed at the bottom of the fermentation compartment partition;

Long axis type propeller 1; propeller drive shaft 2; propeller 3; propeller casing 4; material 5; fermentation tank concrete floor 6; fermentation compartment concrete partition wall 7; left fermentation tank 8; (1), (2), (3), (4), (5), (6), (7) indicate the material area.

detailed description

The present invention will be described below in connection with specific embodiments, but the present invention is not limited to the following examples. Figure 1 is a schematic diagram of the structure and working principle of the propeller, and the overall shape of the long-shaft propulsion impeller is shown in Figure 2;

The thruster is installed in the bottom of the fermentation compartment partition.

A method for continuously propelling by using the above device, comprising the steps of:

Propulsion process: As shown in the figure, the impeller AB rotates counterclockwise, and the impeller CD rotates clockwise. The two impellers rotate relative to each other as shown in the figure.

Firstly, it is rotated by the impeller AB into the material of the (1) zone of the propeller. As the AB impeller rotates counterclockwise from the right material tank into the left material tank, the impeller continues to rotate. (1) The material in the impeller CD is squeezed and removed. , complete the unloading process (see Figures 3 to 5). In this process, the material in the (3) zone is pushed into the left compartment by the impeller CD, and the material in the (4) zone is brought into the propeller by the AB impeller. When the propeller rotates to the state of Fig. 5, the materials in the zone (1) and (2) are completely pushed to the left compartment. in. By analogy, the two sets of impellers rotate one revolution to complete the process of pushing the materials in the (1), (2), (3), and (4) zones from the right fermentation tank to the left fermentation tank.

Example 1

Hydrolytic acidification and biogas dry fermentation with 70% municipal sewage treatment dewatered sludge (water content 80%) and 30% kitchen waste mixed raw materials, thruster height (between the highest point of the AB impeller casing and the lowest point of the CD impeller casing) The distance is the same as the design of 500mm, the length of the long axis of the single-piece impeller is 300mm (the length of the AB or CD direction, the same below), and the length of the impeller along the drive shaft (the axial length of the long-axis propeller, the same below) For 10m, the amount of material of the impeller is 0.7m ³ and the impeller speed is designed according to 0.25r/min. The drive can guide 250m ³ per day.

Example 2

70% urban sewage treatment dewatered sludge (water content 80%) and 30% kitchen waste mixed raw materials for hydrolysis acidification plus biogas dry fermentation. The height of the thruster is designed to be 250mm, the length of the long axis of the single-piece impeller is 150mm, the length of the impeller along the drive shaft is 10m, the amount of material of the impeller is 0.18m ³ , and the impeller speed is designed according to 1r/min. Material 250m ³ .

Claims

Large viscous semi-solid homogeneous material propeller, comprising two long-axis propulsion impellers (1), two propeller drive shafts (2), and a propeller casing (4);

The long-shaft propulsion impeller (1) has a long cylindrical structure as a whole, that is, an impeller having an axial length, that is, an elongated design along the direction of the drive shaft in the design of the impeller fin, and a vertical axial section is a dumbbell Type structure, both ends of the dumbbell-shaped structure and the intermediate outer surface are curved; each long-axis propulsion impeller (1) has a propeller drive shaft (2) and two long-axis propulsion impellers (1) The axes are parallel to each other, and the two impellers rotate in opposite directions with their respective axes as the center, and rotate synchronously. The two long-axis propulsion impellers (1) rotate in opposite directions, one clockwise, one counterclockwise, and in the process of rotation. The two vane impeller surfaces are always in a relatively synchronous bite seal; a propeller housing (4) is provided outside each long-axis propeller (1), and the inner surface of the propeller housing (4) is semi-cylindrical The cavities are such that each long-axis propulsion impeller (1) is always tangent to the corresponding semi-cylindrical cavity during rotation.
The material pusher of claim 1 is for advancing a viscous semi-solid material.
The material propeller of claim 1 is for propelling a viscous semi-solid material, characterized in that the outer surface of the propeller casing (4) is provided with a barrier such that the barrier and the propeller jointly divide the space barrier on both sides of the propeller into two In some spaces, with the relative synchronous rotation of the two long-axis propulsion impellers (1), the viscous semi-solid material is transported from one side space to the other side following the rotation of the long-axis propulsion impeller (1).
The material propeller of claim 1 is used for continuous biogas dry fermentation of large viscous semi-solid homogeneous material propulsion, characterized in that a large viscous semi-solid homogeneous material propeller is arranged at the bottom of the fermentation compartment partition wall, and is installed at a large scale The viscous semi-solid homogeneous material propeller inlet sinks into the bottom of the fermentation tank, and the inlet lower edge is flush with the bottom of the fermentation tank. The material of the fermentation tank is continuously sinking under the action of its own gravity, and is continuously introduced into the next partition by the propeller. The cabin completes the advancement of the entire material.