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Membrane separation biogas biological desulfurization method and device thereof

A technology of biological desulfurization and membrane separation, which is applied in the field of biogas biological desulfurization of low-concentration hydrogen sulfide biogas, can solve the problems of high operating costs and infrastructure costs, inability to meet desulfurization needs, and reduced desulfurization efficiency, avoiding dilution of biogas and safety. problems, the effect of solving the cost of desulfurization and avoiding potential safety hazards

Active Publication Date: 2017-09-01
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In view of the characteristics of large amount of biogas generated by anaerobic digestion of high solid sludge (the gas production per cubic meter of sludge added is about 3 times that of conventional sludge anaerobic digestion) and low concentration of hydrogen sulfide (<200ppm), the existing The desulfurization process can no longer meet its desulfurization needs
[0006] The specific manifestations are: low concentration of hydrogen sulfide leads to low desulfurization efficiency of dry or wet chemical desulfurization and biogas membrane separation process and large gas flow rate, high operating costs and infrastructure costs; such as biogas reaction tower biological desulfurization process and Biogas biological desulfurization process in the digester, because the content of hydrogen sulfide is very low, if it is added according to the conventional ratio of biogas to air (4-6%), it will cause excess air to dilute the biogas, which will bring safety hazards while reducing the concentration of methane; For example, when using the biogas absorption tower biological desulfurization process, in order to adapt to the increase of gas volume, the increase of spray volume will lead to a further increase in the volume of the absorption liquid treatment unit on the original basis, and the increase in the volume and flow rate of the absorption liquid will affect the control systems such as aeration and temperature. At the same time, the increase of the packing volume will lead to an excessive pressure drop in the tower. Due to the low concentration of hydrogen sulfide in the biogas, when passing through the packing layer, the metabolic rate of sulfur oxidizing bacteria to hydrogen sulfide will decrease, resulting in desulfurization Reduced efficiency

Method used

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  • Membrane separation biogas biological desulfurization method and device thereof
  • Membrane separation biogas biological desulfurization method and device thereof
  • Membrane separation biogas biological desulfurization method and device thereof

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Experimental program
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Effect test

Embodiment 1

[0037] combine figure 1 , the biogas desulfurization device of this embodiment includes a reaction tower 1, a nutrient solution circulating water tank 2, a replenishment liquid tank 3 and an aeration pipe 4, the replenishment liquid tank 3 supplies liquid to the nutrient solution circulating water tank 2, and the aeration pipe 4 goes deep into the nutrient solution circulation The bottom of the water tank 2 is aerated, and the nutrient solution circulating water tank 2 provides the liquid required for the reaction of the reaction tower 1;

[0038] The reaction tower 1 is sequentially provided with a spray area A, a reaction area B and a settling area C from top to bottom. The spray area A is a cylindrical cavity, and a spray head 103 is placed in the cavity, and the spray head 103 will come from the nutrient solution. The nutrient solution in the circulating water tank 2 is evenly sprayed to the reaction zone B, and the spray zone A is connected to the reaction zone B;

[003...

Embodiment 2

[0043] In this embodiment, the biogas desulfurization device in Example 1 is used to desulfurize the biogas with hydrogen sulfide, and the process is as follows:

[0044] The overall dimensions of the reaction tower 1 are: diameter Height h=1800mm; where the height of spraying area A is h 1 = 450mm, the height of reaction zone B is h 2 = 1100mm and the height of the settlement zone C is h 3 =250mm; The perforated aperture on the support plate 107 is The size of the outlet of elemental sulfur in the settling zone is

[0045] The tower body inlet and outlet pipelines include: the diameter of the inlet pipe 102 The diameter of the outlet pipe 101 The pipe diameter of the pipe connected to the shower head 103 is The pipe diameter of circulation pipe 106 is The size of the hollow fiber membrane module 104 used is shown in the table below:

[0046] Table 1 Dimensions of hollow fiber membrane modules

[0047]

[0048] The diameter of the sealed upper chamber is ...

Embodiment 3

[0054] combine figure 2 , the difference between the biogas desulfurization device of this embodiment and Embodiment 1 is that a PLC control box (including temperature online controller, dissolved oxygen online controller, pH online measuring instrument and sensor) can be installed in the membrane separation biogas biological desulfurization device. Effectively control the dissolved oxygen concentration of the nutrient solution and record the operating status of the system. The monitoring-control system of this device is based on the feedback control of the online measurement results of the temperature, pH and dissolved oxygen of the nutrient solution;

[0055] The PLC control box (on-line temperature controller, dissolved oxygen on-line controller, pH on-line measuring instrument and sensor) is connected with the gas flow rate controller and two hydrogen sulfide on-line monitors to record operating data and feedback control the circulating water pump, gas The operation of th...

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Abstract

The invention discloses a membrane separation biogas biological desulfurization method and a device thereof. The method includes separating hydrogen sulfide gas in biogas from biogas through a hollow fiber membrane module, and the separated hydrogen sulfide gas is stored in a tower outside the hollow fiber membrane module. Biological desulfurization treatment is carried out in the filler, and the biogas after the separation of hydrogen sulfide gas is collected through the hollow fiber membrane module; it overcomes the biogas reaction tower biological desulfurization process adding air to dilute the biogas, the biogas absorption tower biological desulfurization process absorption liquid treatment complex, and biogas external exposure The problem of residual oxygen in the biological desulfurization biogas of the gas reaction tower and low biological treatment efficiency of low-concentration hydrogen sulfide biogas can achieve efficient and stable removal of hydrogen sulfide in the biogas and recover resources in the form of sulfur element, reducing operating costs.

Description

technical field [0001] The invention belongs to the field of sewage treatment, in particular to a biogas biodesulfurization method and device for treating low-concentration hydrogen sulfide biogas produced by anaerobic digestion of high-solid sludge in urban sewage treatment plants. Background technique [0002] The biogas produced by anaerobic digestion of sludge in traditional urban sewage treatment plants contains high concentrations of hydrogen sulfide (the concentration of hydrogen sulfide is about 1000-2000ppm). Hydrogen sulfide is toxic and will corrode anaerobic digestion and biogas utilization equipment. Its existence not only It limits the utilization of biogas and indirectly hinders the large-scale application of anaerobic digestion. At present, the main biogas desulfurization technologies in China are physical method, chemical method and biological method. Among them, the wet and dry desulfurization technologies in the chemical method have the disadvantages of h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/52B01D53/22B01D53/84C10L3/10
CPCY02A50/20
Inventor 韩芸卓杨彭党聪曹利代璐李香莉
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY