Biogas purification and resource recycling system based on anaerobic fermentation of organic waste

Abstract

The invention discloses a biogas purification resource recycling system based on anaerobic fermentation of organic waste, comprising: an anaerobic fermentation subsystem is respectively provided with an organic waste feed port, a biogas outlet, an organic fertilizer outlet and a waste liquid outlet; a deodorization subsystem is connected to the anaerobic fermentation subsystem; the biogas outlet of the anaerobic fermentation subsystem is respectively connected to a first biogas purification device and a second biogas purification device; an EnvironTec biological desulfurization device is respectively provided with a cogeneration connection port and a sulfuric acid output port, the cogeneration connection port can be connected to the cogeneration subsystem, and the sulfuric acid output port is connected to a chemical agent input port of the deodorization subsystem; a THIOPAQ biological desulfurization device is respectively provided with a biogas purification connection port and a sulfur paste output port, the cogeneration connection port can be connected to the cogeneration subsystem, and the sulfur paste output port is connected to an aerobic composting device of the anaerobic fermentation subsystem. Different biological desulfurization methods can be fully utilized, and the hazardous waste generated thereby can be recycled and utilized.

Description

Technical Field

[0001] The invention relates to the field of biogas purification, and in particular to a biogas purification resource recycling system based on anaerobic fermentation of organic waste. Background Art

[0002] Obtaining biogas through anaerobic digestion is a common method for obtaining biomass energy. When biogas is produced from anaerobic fermentation equipment, especially when fermented at medium or high temperatures, it carries a large amount of H 2 S, which will cause corrosion and blockage of metal pipes, valves and flow meters, as well as corrosion of the metal surface of equipment. H must be removed. 2 S.

[0003] At present, the commonly used biogas desulfurization methods include dry desulfurization, wet desulfurization, biological desulfurization, etc. Since biological desulfurization is the most economical and environmentally friendly technology, it is mostly used in large-scale projects. Biogas biological desulfurization is a new technology developed in the 1990s. It has been widely studied abroad and has made great progress in application. There are relatively mature biogas biological desulfurization integrated technologies abroad, mainly including: Shell-PAQ process of Dutch Parker Company, Austria EnvironTec biofilter desulfurization process, etc. These processes have also been widely used in China.

[0004] Of the two biodesulfurization processes mentioned above, the EnvironTec process is relatively simple, but it will introduce O into the biogas. 2 This may affect the subsequent use of biogas. In addition, the final product of the EnvironTec process is sulfuric acid, which needs to be neutralized with alkali solution before discharge, which not only wastes resources but also increases operating costs. The final product of the THIOPAQ process is sulfur. Sulfur paste requires a specific industrial processing plant to be used. If it is not recycled, it is also a hazardous waste. At present, there is no way to fully recycle it.

[0005] At present, the anaerobic fermentation project of organic waste cannot fully utilize biological desulfurization to obtain purified biogas while recycling the hazardous waste generated by biological desulfurization.

[0006] In view of this, the present invention is proposed. Summary of the invention

[0007] The purpose of the present invention is to provide a biogas purification resource recycling system based on anaerobic fermentation of organic waste, which can purify biogas with different biological desulfurization processes as needed and recycle hazardous wastes from biological desulfurization, thereby solving the above-mentioned technical problems existing in the prior art.

[0008] The objective of the present invention is achieved through the following technical solutions:

[0009] The embodiment of the present invention provides a biogas purification resource recycling system based on anaerobic fermentation of organic waste, comprising:

[0010] Anaerobic fermentation subsystem, deodorization subsystem, EnvironTec biodesulfurization unit and THIOPAQ biodesulfurization unit; among them,

[0011] The anaerobic fermentation subsystem is respectively provided with an organic waste feed inlet, a biogas outlet, an organic fertilizer outlet and a waste liquid outlet;

[0012] The deodorization subsystem is connected to the anaerobic fermentation subsystem;

[0013] The biogas outlet of the anaerobic fermentation subsystem is connected to the first biogas purification device and the second biogas purification device respectively;

[0014] The EnvironTec biodesulfurization device is provided with a cogeneration connection port and a sulfuric acid output port, the cogeneration connection port can be connected to the cogeneration subsystem, and the sulfuric acid output port is connected to the chemical agent input port of the deodorization subsystem;

[0015] The THIOPAQ biological desulfurization device is respectively provided with a biogas purification connection port and a sulfur paste output port, the cogeneration connection port can be connected to a cogeneration subsystem, and the sulfur paste output port is connected to an aerobic composting device of the anaerobic fermentation subsystem.

[0016] Compared with the prior art, the biogas purification resource recycling system based on anaerobic fermentation of organic waste provided by the present invention has the following beneficial effects:

[0017] By setting up the EnvironTec biodesulfurization device and the THIOPAQ biodesulfurization device at the same time and connecting them to the biogas outlet of the anaerobic fermentation subsystem, two biodesulfurization biogas purification devices are provided in the same system. According to the needs of the back-end biogas application, the biogas can be purified by different biodesulfurization methods, and the hazardous waste generated by the biodesulfurization can be recycled. For example, the biogas after preliminary purification is used in the cogeneration mode, and the EnvironTec biodesulfurization device is used to remove H from the biogas. 2 S, the generated sulfuric acid is used as a chemical agent in the deodorization subsystem, and the biogas after preliminary purification is used in a purification and refining manner, and the THIOPAQ biological desulfurization device is used to remove H 2 The sulfur paste produced is used as the auxiliary material for aerobic composting in the anaerobic fermentation subsystem. The system makes full use of the advantages of different biological desulfurization devices, desulfurizes biogas in different ways according to the needs, and realizes the recycling of hazardous wastes generated by desulfurization. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0019] Figure 1 A schematic diagram of a biogas purification resource recycling system based on anaerobic fermentation of organic waste is provided for an embodiment of the present invention;

[0020] Figure 2 A schematic diagram of a specific structure of a biogas purification resource recycling system based on anaerobic fermentation of organic waste is provided for an embodiment of the present invention;

[0021] In the figure: 1- anaerobic fermentation subsystem; 2- deodorization subsystem; 3- EnvironTec biodesulfurization device; 4- THIOPAQ biodesulfurization device; A- organic waste feed inlet; B- biogas outlet; C- organic fertilizer and waste liquid outlet; D- cogeneration connection port; E- sulfuric acid output port; F- biogas purification connection port; G- sulfur paste output port. DETAILED DESCRIPTION

[0022] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, not all of the embodiments, which does not constitute a limitation of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the present invention.

[0023] First, the terms that may be used in this article are explained as follows:

[0024] The term “and / or” means that either or both of them can be realized at the same time. For example, X and / or Y means both “X” or “Y” and “X and Y”.

[0025] The terms "include", "comprises", "contains", "has" or other descriptions with similar semantics should be interpreted as non-exclusive inclusion. For example, including certain technical feature elements (such as raw materials, components, ingredients, carriers, dosage forms, materials, dimensions, parts, components, mechanisms, devices, steps, procedures, methods, reaction conditions, processing conditions, parameters, algorithms, signals, data, products or products, etc.) should be interpreted as including not only certain technical feature elements explicitly listed, but also other technical feature elements known in the art that are not explicitly listed.

[0026] The term "consisting of..." means excluding any technical feature elements not explicitly listed. If this term is used in a claim, it will make the claim closed, so that it does not contain technical feature elements other than the technical feature elements explicitly listed, except for the conventional impurities related to them. If this term only appears in a clause of a claim, it only limits the elements explicitly listed in the clause, and the elements recorded in other clauses are not excluded from the overall claim.

[0027] Unless otherwise specified or limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this article can be understood according to specific circumstances.

[0028] When concentration, temperature, pressure, size or other parameters are expressed in the form of a numerical range, the numerical range should be understood to specifically disclose all ranges formed by the pairing of any upper limit, lower limit, and preferred value in the numerical range, regardless of whether the range is explicitly stated; for example, if a numerical range of "2 to 8" is stated, the numerical range should be interpreted as including ranges such as "2 to 7", "2 to 6", "5 to 7", "3 to 4 and 6 to 7", "3 to 5 and 7", "2 and 5 to 7", etc. Unless otherwise specified, the numerical ranges stated herein include both their end values ​​and all integers and fractions within the numerical range.

[0029] The orientation or position relationship indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the drawings and are only for the convenience and simplification of description, and do not explicitly or implicitly indicate that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation of this document.

[0030] The biogas purification resource recycling system based on anaerobic fermentation of organic waste provided by the present invention is described in detail below. The contents not described in detail in the embodiments of the present invention belong to the prior art known to professionals and technicians in this field. If the specific conditions are not indicated in the embodiments of the present invention, they are carried out according to the conventional conditions in the field or the conditions recommended by the manufacturer. If the manufacturers of the reagents or instruments used in the embodiments of the present invention are not indicated, they are all conventional products that can be purchased commercially.

[0031] like Figure 1 , 2 As shown, an embodiment of the present invention provides a biogas purification resource recycling system based on anaerobic fermentation of organic waste, characterized in that it includes:

[0032] Anaerobic fermentation subsystem, deodorization subsystem, EnvironTec biodesulfurization unit and THIOPAQ biodesulfurization unit; among them,

[0033] The anaerobic fermentation subsystem is respectively provided with an organic waste feed inlet, a biogas outlet, an organic fertilizer outlet and a waste liquid outlet;

[0034] The deodorization subsystem is connected to the anaerobic fermentation subsystem;

[0035] The biogas outlet of the anaerobic fermentation subsystem is connected to the first biogas purification device and the second biogas purification device respectively;

[0036] The EnvironTec biodesulfurization device is provided with a cogeneration connection port and a sulfuric acid output port, the cogeneration connection port can be connected to the cogeneration subsystem, and the sulfuric acid output port is connected to the chemical agent input port of the deodorization subsystem;

[0037] The THIOPAQ biological desulfurization device is respectively provided with a biogas purification connection port and a sulfur paste output port, the cogeneration connection port can be connected to a cogeneration subsystem, and the sulfur paste output port is connected to an aerobic composting device of the anaerobic fermentation subsystem.

[0038] The EnvironTec biodesulfurization device uses an EnvironTec biodesulfurization tower;

[0039] The THIOPAQ biological desulfurization device adopts a THIOPAQ biological desulfurization tower.

[0040] See also Figure 2 In the biogas purification resource recycling system based on anaerobic fermentation of organic waste of the present invention, the composition and process flow of the anaerobic fermentation subsystem are basically consistent with the existing commonly used anaerobic fermentation engineering of organic waste, and the processing process is as follows:

[0041] The organic waste collected from outside the plant is temporarily stored in the mixing silo after pretreatment, and then the material is sent to the anaerobic fermentation device (i.e. dry reactor) through the screw conveyor of the feeding mechanism for anaerobic treatment; after the anaerobic reaction is completed, the material is sent to the solid-liquid separation room for solid-liquid separation through the discharging mechanism; the biogas slurry is processed into liquid fertilizer or discharged as qualified water, and the biogas residue is aerobic composted to be used as organic fertilizer;

[0042] After the biogas is stored in the biogas storage tank, it is purified and H is removed by the biogas purification device.2 After S, subsequent utilization treatment such as cogeneration or purification is carried out;

[0043] The odor generated in the pretreatment and composting stages is treated by the deodorization subsystem and then discharged;

[0044] In the biogas purification resource recycling system of the present invention, when the cogeneration process is subsequently adopted, the EnvironTec biological desulfurization device is used to desulfurize the biogas using the EnvironTec process, and the hazardous waste sulfuric acid produced after desulfurization is used as a chemical agent of the deodorization subsystem to remove the odor generated in the pretreatment stage and the composting stage, the main component of which is ammonia;

[0045] For the subsequent process of biogas purification to produce natural gas, the THIOPAQ biological desulfurization device is used to desulfurize the biogas using the THIOPAQ process. The sulfur paste produced after desulfurization is recovered and added to the aerobic composting section of the anaerobic fermentation subsystem, and mixed with the biogas residue to make organic fertilizer. The THIOPAQ process can avoid the mixing of O 2 Afterwards, it has a great impact on the purification of biogas to produce natural gas.

[0046] In summary, it can be seen that the biogas purification resource recycling system of the embodiment of the present invention can select a desulfurization device that is compatible with the process corresponding to the subsequent application of biogas for biogas desulfurization through the setting of the overall process flow, and at the same time, the dangerous products of desulfurization can be recycled and utilized, which not only ensures the quality of biogas, but also improves the utilization rate of hazardous resources.

[0047] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims. The information disclosed in the background technology section of this article is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as an admission or in any form that the information constitutes prior art known to those skilled in the art.

Claims

1. A biogas purification resource recycling system based on anaerobic fermentation of organic waste, characterized in that: include: Anaerobic fermentation subsystem, deodorization subsystem, EnvironTec biodesulfurization unit and THIOPAQ biodesulfurization unit; among them, The anaerobic fermentation subsystem is respectively provided with an organic waste feed inlet, a biogas outlet, and an organic fertilizer and waste liquid outlet; The deodorization subsystem is connected to the anaerobic fermentation subsystem; The biogas outlet of the anaerobic fermentation subsystem is connected to the EnvironTec biodesulfurization device and the THIOPAQ biodesulfurization device respectively; The EnvironTec biological desulfurization device is provided with a cogeneration connection port and a sulfuric acid output port, the cogeneration connection port can be connected to the cogeneration subsystem, and the sulfuric acid output port is connected to the chemical agent input port of the deodorization subsystem; the EnvironTec biological desulfurization device adopts an EnvironTec biological desulfurization tower; The THIOPAQ biological desulfurization device is respectively provided with a biogas purification connection port and a sulfur paste output port. The biogas purification connection port can be connected to a cogeneration subsystem, and the sulfur paste output port is connected to an aerobic composting device of the anaerobic fermentation subsystem. The THIOPAQ biological desulfurization device adopts a THIOPAQ biological desulfurization tower.

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