Biogas hydrogen production circulating system and technology for PTA sewage treatment

Abstract

The invention provides a biogas hydrogen production circulating system and technology for PTA sewage treatment. The system comprises: a PTA device, a settling tank, an anaerobic baffled reactor, a sedimentation tank, a biogas collection tank, a desulfurization adsorption device, a nitrogen-oxygen removal device, a cracking reactor, an alkaline washing tower I, a gas-liquid separator, a pressure swing adsorption device, a vapor heat exchanger, an alkaline washing tower II, a desalted water washing tower I and a desalted water washing tower II. According to the system and technology provided bythe invention, a sewage treatment unit in traditional technology is changed; sewage produced in a production process of the PTA device is subjected to biochemical treatment to generate biogas; methanein the biogas is extracted and converted into hydrogen; the hydrogen, together with the hydrogen converted from the released gas, is subjected to pressure swing adsorption to obtain high-purity hydrogen which is applied to a refining reaction of the PTA device; purchase of raw materials and energy is not needed, the operation cost of the PTA device is lowered, recycling of internal resources of the PTA device is realized, and an aim of energy conservation and emission reduction is achieved.

Description

technical field [0001] The invention relates to the field of PTA circulation devices, in particular to a biogas hydrogen production circulation system and process for PTA sewage treatment. Background technique [0002] Terephthalic acid (PTA) is one of the important bulk organic raw materials. 90% of the world's PTA is used to produce polyethylene terephthalate (PET), which is widely used in fiber polyester, polyester film, Plastics, pesticides and dyes and other production areas. During the production and application of PTA, a large amount of high-concentration PTA sewage will be produced, and the pollutants in PTA sewage are mostly aromatic compounds with high concentration, which is difficult to biodegrade and difficult to treat. General PTA sewage treatment equipment will produce a large amount of biogas after biochemical treatment of sewage. In the current domestic PTA devices, these biogas are mainly used as fuel for boilers and tail gas combustion furnaces or for com...

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Problems solved by technology

[0003] Chinese patent application CN 203269722 discloses a PTA sewage treatment system to overcome the shortcomings of the prior art such as long treatment time, large floor space and high operating costs. It includes an acidification sedimentation tank, an internal circulation anaerobic reactor, a first settling tank, Biological fluidized bed aerobic reactor, second settling tank and air flotation filter, the advantages of this application are to improve the efficiency of PTA sewage treatment, reduce mud production, reduce floor space, etc., but the disadvantage is that the biogas generated by biochemical treatment is not effectively processed processing, resulting in waste of resources and environmental pollution

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