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A biogas digester and its heat exchange tube setting method

A heat exchange tube and biogas digester technology, which is applied in biological sludge treatment, waste fuel and other directions, can solve the problem that the biogas digester cannot produce gas normally, and achieve the effect of improving the heat energy utilization efficiency, reducing the amount of pipe materials and increasing the heat exchange intensity.

Active Publication Date: 2017-06-16
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the defects and deficiencies in the prior art, the purpose of the present invention is to propose a method for increasing the temperature of an embedded spherical double helix tube suitable for a spherical fiberglass biogas digester, so as to solve the problem that the biogas digester cannot normally produce gas during winter and transitional seasons. question

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  • A biogas digester and its heat exchange tube setting method
  • A biogas digester and its heat exchange tube setting method
  • A biogas digester and its heat exchange tube setting method

Examples

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Embodiment 1

[0036] Example 1: Digester structure

[0037] to combine figure 1 , 2 , 3 and 4, the biogas digester of the present embodiment is a fiberglass biogas digester, which is spherical in shape as a whole, divided into two parts, the upper and lower hemispheres, without a stirring device, and belongs to static fermentation;

[0038] The biogas digester includes a feed port 1, a working port 2, a discharge port 3, a tank body 4 and a heat exchange tube 5, wherein the working port 2 is set at the top center of the spherical tank body, and the feed port 1 and the discharge port 3 are located on the tank body on both sides of the working port 2. The cylindrical interface of the working port 2 communicates with the tank body 4, and the water storage chamber 201, the air guide tube 202 and the movable cover 203 are arranged in the working port 2, and the movable cover 203 is set At the junction of the working port 2 and the tank body 4, the space from the movable cover 203 to the top ed...

Embodiment 2

[0043] Embodiment 2: Setting method of heat exchange tube

[0044] The heat exchange tubes in the biogas digester in Example 1 are set, and the setting method is as follows:

[0045] The helix in this embodiment refers to the axis of the heat exchange tube, which is in the form of a spherical helix;

[0046] Pitch refers to the distance between the axes of two adjacent heat exchange tubes in the vertical direction;

[0047] The radius of the spherical surface refers to the distance from any point on the axis of the heat exchange tube to the center of the spherical surface;

[0048] Azimuth refers to the angle between a line connecting a point and the origin of coordinates in the plane Cartesian coordinate system and the axis of coordinates. When calculating the azimuth angle of the spherical helix in three-dimensional space, project all the points on the helix and the center of the sphere onto the same horizontal plane, establish a plane coordinate system with the center of ...

Embodiment 3

[0186] Embodiment Three: Application Example

[0187] The volume of the spherical fiberglass digester in embodiment one is 6m 3 , the diameter is about 2.2m, the pool wall is 10mm thick, and the outer wall of the pool is laid with a 30mm thick insulation layer, installed in a 3m deep pit under the ground, and the average temperature of the 0-3m soil in winter is 7.6°C.

[0188] According to relevant data, biogas fermentation bacteria can carry out normal growth activities and produce biogas in the range of 8-65 °C, and between 30-40 °C is medium-temperature fermentation, and around 35 °C is the peak of gas production. Therefore, the design The biogas slurry temperature was 35°C.

[0189] If the water temperature of the heat exchange tube is too high, the fermentation bacteria around the tube will be scalded to death. If the temperature is too low, the designed biogas slurry temperature cannot be maintained. Therefore, the temperature of the water entering the heat exchange tu...

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Abstract

The invention discloses a biogas tank and a method for setting heat exchange tubes thereof. The heat exchange tubes are embedded on the fins with U-shaped slots integrated with the biogas tank, and the position of the slots is determined according to certain rules, so that the heat exchange tubes It is in the form of a spherical helix, and the water supply and return pipes are arranged at intervals. The method includes the installation arrangement method of the spherical spiral pipe, the determination method of the screw pitch, and the calculation method of the pipe length. First of all, according to the shape and material of the biogas digester, the layout form of the spiral heat exchange tubes, the type of installation components and the calculation of the slot position of the fixed heat exchange tubes are proposed. Then, the effect of tube spacing on heat transfer is analyzed, and the pitch of the helical tube is determined by numerical simulation method according to the heat transfer principle. Finally, in the case of determining the heat medium and biogas fermentation parameters, according to the principle of energy conservation, the length of the required spiral tube is obtained by trial calculation.

Description

technical field [0001] The invention relates to a biogas digester and a method for setting heat exchange tubes thereof, in particular to a spherical fiberglass biogas digester and a method for setting a spherical double-helical tube embedded therein, which is mainly used to solve the problem that the biogas digester cannot produce gas normally in a cold environment question. Background technique [0002] Biogas fermentation needs to be carried out within a certain temperature range, and the temperature in northern rural areas is low in winter, which makes it difficult to meet the conditions for biogas fermentation, resulting in a large number of biogas digesters being idle. Heating the biogas slurry with the help of an external heat source can restore the normal operation of the biogas digester that originally failed to work normally in winter. [0003] After searching, it was found: "A solar heating and power supply biogas heating device" (patent number: 201310610134.0) di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/04
CPCY02E50/30
Inventor 刘艳峰陈耀文王登甲季广学陈晨
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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