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Hydrogen production method by supercritical water gasification using bloom-forming cyanobacteria as raw material

A technology of supercritical water gasification and water bloom cyanobacteria, which is applied in the field of resources and environment, can solve the problems of long time-consuming anaerobic digestion, increased dehydration steps, and low processing efficiency, and achieves simple, fast and efficient processing methods, rapid processing, and reduced processing cost effect

Inactive Publication Date: 2012-11-07
HOHAI UNIV
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  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved: the present invention aims at the technical problems that the anaerobic digestion in the existing cyanobacteria treatment method takes a long time, the treatment is not complete, the treatment efficiency is low due to the high water content of the algae liquid, and the increase of the dehydration step will cause the technical problems of the process to be complicated, and At the same time, taking into account the conversion and reuse of energy, the present invention provides a device and method for direct supercritical water gasification of water bloom cyanobacteria to produce hydrogen

Method used

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  • Hydrogen production method by supercritical water gasification using bloom-forming cyanobacteria as raw material
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  • Hydrogen production method by supercritical water gasification using bloom-forming cyanobacteria as raw material

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Embodiment approach 1

[0026] The cyanobacteria liquid salvaged from Taihu Lake and entering the algae-water separation station, with a water content of 96%, is directly injected into a supercritical water reactor preheated to a temperature of 450°C through a high-pressure pump, and after reacting for 5 to 10 minutes, it passes through a heat exchanger , cooler, pressure reducing valve, gas-liquid separator, etc. to separate the gas-liquid products, and the gas-phase product components are shown in Table 1.

Embodiment approach 2

[0028] The cyanobacteria liquid salvaged from Taihu Lake and entering the algae-water separation station is further dehydrated and concentrated by the dehydration device, and the water content is reduced to 86%. It is directly injected into the supercritical water reactor pre-heated to a temperature of 450°C through a high-pressure pump , after reacting for 5 to 10 minutes, separate the gas-liquid products through heat exchangers, coolers, pressure reducing valves, gas-liquid separators, etc., see the specific process flow figure 2 . Controlling different reaction parameter conditions, the gas phase product components are shown in Table 1.

Embodiment approach 3

[0030] The difference from Embodiment 1 is that the temperature and pressure of the supercritical water reactor are increased to 500°C and 25MPa. The gas-liquid products were separated, and the gas-phase product components are shown in Table 1.

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Abstract

The invention provides a device and a method for producing hydrogen by direct supercritical water gasification of bloom-forming cyanobacteria, according to the characteristics that the bloom-forming cyanobacteria suspension has high water content, and forms into supercritical water under high temperature and high pressure, and that organic matters in the cyanobacteria suspension can form combustible gas rich in hydrogen. The device and the method provided by the invention can realize direct supercritical water gasification reaction on the salvaged bloom-forming cyanobacteria, so as to obtain hydrogen; the process is simple and requires no secondary dehydration or water addition; the produced new energy of hydrogen can be reused; the reaction time is greatly shortened to realize efficient and fast treatment on bloom-forming cyanobacteria; and the treatment process does not require addition of an oxidizing agent, and has significantly reduced treatment cost compared with supercritical water oxidation treatment. Therefore, the method overcomes technical problems in an existing bloom-forming cyanobacteria treatment, such as long anaerobic digestion time, incomplete treatment, low treatment efficiency due to large water content in the bloom-forming cyanobacteria suspension and complication caused by addition of a dehydration step, and at the same time gives consideration to energy transformation and utilization.

Description

technical field [0001] The invention belongs to the field of resources and environment, and in particular relates to a method for producing hydrogen through supercritical water gasification by using algal blooms as raw materials. Background technique [0002] The eutrophication of water body and the outbreak of cyanobacteria to form algal blooms have caused serious harm to the environment of our country. Salvage is a common measure taken by my country to deal with the pollution caused by algal blooms in lakes. It has been used regularly in Dianchi Lake, Taihu Lake, and Chaohu Lake in my country. According to incomplete statistics, in 2011 Jiangsu Province salvaged 970,000 tons of blue-green algae liquid from Taihu Lake, nearly 300,000 tons more than in 2010. How to timely and quickly harmlessly treat and utilize these cyanobacteria liquids salvaged ashore is the key to the control of water blooms and cyanobacteria. If the salvaged blue-green algae cannot be treated in a ti...

Claims

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Application Information

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IPC IPC(8): C01B3/02
CPCY02P20/54
Inventor 朱伟徐志荣张会文龚淼
Owner HOHAI UNIV
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