CN101920258A - Energy utilization system of organic wastes with zero emission of carbon dioxide - Google Patents

Abstract

The invention provides a carbon dioxide emission-free organic waste energy utilization system. It is an organic combination of anaerobic fermentation hydrogen production, biogas fermentation, CO ₂ absorption, microalgae fixation of CO ₂ , biogas slurry treatment, and energy grass planting. The system of the present invention is suitable for processing various types of organic wastes, and can be applied to the treatment of agricultural organic wastes, industrial organic wastes, domestic organic wastes, sludge, etc., and new energy development industries. Through the application of the present invention, it can Implement the specific application demonstration of circular economy, obtain clean energy while eliminating environmental pollution, and have no greenhouse gas emissions in the process, and can achieve the triple effect of waste treatment, clean and renewable energy production, and carbon dioxide emission reduction.

Description

Carbon dioxide emission-free organic waste energy utilization system

technical field

The invention belongs to the fields of waste treatment and clean energy development, and in particular relates to a carbon dioxide emission-free organic waste energy utilization system.

technical background

It is an indisputable fact that the excessive development and utilization of fossil fuels has caused global warming, acid rain, and ecological environment damage and degradation, and fossil fuels are also facing exhaustion. Therefore, based on environmental and energy considerations, human beings urgently need a non-polluting of renewable energy. Hydrogen energy is an ideal clean and renewable alternative fuel. It only produces water after burning, without other greenhouse gases, and can be directly and efficiently converted into electricity through fuel cells. From an environmental point of view, the use of various organic wastes for anaerobic fermentation of hydrogen production is a major research focus in recent years, and is considered to be the most likely to be the first to realize the commercial application of biological hydrogen production technology.

The biochemical mechanism of hydrogen production by anaerobic fermentation determines that the organic substances capable of hydrogen production by anaerobic fermentation are mainly carbohydrate raw materials such as sugar, starch and cellulose, and it is difficult for proteins and lipids to produce hydrogen by anaerobic fermentation; moreover, Hydrogen production from carbohydrate fermentation is accompanied by the formation of by-products such as various small molecule organic acids and alcohols, which cannot be completely converted into hydrogen. The above two reasons lead to the low energy recovery efficiency and organic matter utilization rate of anaerobic fermentation of organic waste for hydrogen production. For this reason, anaerobic fermentation and co-production of hydrogen and methane are usually used to improve energy recovery efficiency. First, organic waste is used for anaerobic fermentation to produce hydrogen, and then hydrogen production residues (including proteins, various amino acids, lipids, And the hydrogen production by-products of carbohydrates such as organic acids and alcohols) undergo anaerobic fermentation to produce methane, that is, traditional biogas fermentation.

When biogas is used as the final form (such as direct combustion), strictly speaking, it is not a clean energy, because even the purified biogas (methane) still emits carbon dioxide into the atmosphere after combustion. Therefore, the cleanest way of utilization is to convert biogas into electricity for utilization. However, whether it is anaerobic fermentation hydrogen production, or biogas fermentation + biogas power generation, it is accompanied by the generation of carbon dioxide. From the perspective of the entire energy utilization process of organic waste, only the absorption, fixation and reuse of carbon dioxide is the real meaning Carbon dioxide zero-emission organic waste energy utilization system.

In addition to hydrogen and biogas, the products of anaerobic fermentation of organic waste include biogas residue and biogas slurry. Biogas residues are usually used as fertilizers. When applied to edible plants (food crops, orchards, vegetables, etc.), deep processing is required to remove toxic substances (especially heavy metals) in biogas residues. At this time, the processing cost of biogas residues is relatively high . If the biogas residue is used as a fertilizer for non-edible plants (such as energy grass), it can be used directly without further processing. However, there is no relevant research report on biogas residue used as a fertilizer for energy grass planting. Biogas slurry is usually used as liquid fertilizer or agricultural irrigation water, but biogas slurry is rich in nitrogen, phosphorus, metal elements and other substances, and the capacity of a unit area of land for these substances is limited. When there is not enough land to accept biogas slurry Sometimes, excessive biogas slurry discharge will pollute the local environment. On the other hand, when microalgae use carbon dioxide as a carbon source for photosynthetic growth, they need nutrients such as nitrogen, phosphorus, potassium, trace elements, vitamins, etc., and these substances are the main components of biogas slurry. Therefore, biogas slurry can be treated Combined with the fixation of carbon dioxide by microalgae, however, there are no related research reports on the coupling of biogas slurry treatment and carbon dioxide fixation by microalgae (from anaerobic fermentation of organic waste).

At present, at home and abroad, there are only independent studies on hydrogen production by anaerobic fermentation of organic waste, independent biogas fermentation of organic waste + biogas power generation technology, independent research on carbon dioxide absorption, fixation, and reuse (microalgae fixation of air or flue gas of thermal power plants) carbon dioxide in). A zero-emission carbon dioxide-emission organic waste energy utilization system that integrates multiple technologies such as anaerobic fermentation hydrogen production, biogas fermentation, carbon dioxide absorption, microalgae fixation of carbon dioxide, biogas slurry treatment, and energy grass planting, and the system can simultaneously obtain Hydrogen and electricity are two clean energy sources, and such a system has not been reported yet.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art, and to provide a carbon dioxide emission-free organic waste energy utilization system, which can obtain two clean energy sources, hydrogen and electricity, while processing organic waste, without using Carbon dioxide is emitted outside.

In order to solve the problems of the technologies described above, the present invention is achieved through the following technical solutions:

The carbon dioxide zero-emission type organic waste energy utilization system of the present invention includes a raw material storage pool, a pretreatment device, a hydrogen production adjustment pool, an anaerobic hydrogen production reactor, a methanation adjustment pool, an anaerobic methanation reactor, a solid Liquid separation equipment, biogas slurry adjustment tank, mixing tank, photobioreactor, air flotation tank, algae expansion tank, carbon dioxide absorption tower, absorption liquid regeneration tower, first gas-water separator, second gas-water separator , carbon dioxide storage tanks, hydrogen storage tanks, biogas desulfurization towers, biogas storage cabinets, biogas generator sets, condensers, waste heat recovery and utilization systems, fertilizer processing plants, energy grass planting bases, the raw material storage pools, pretreatment devices, production Hydrogen adjustment tank, anaerobic hydrogen production reactor, methanation adjustment tank, anaerobic methanation reactor, solid-liquid separation equipment, biogas slurry adjustment tank, mixing tank, photobioreactor, and air flotation tank are connected in sequence; The gas outlet of the anaerobic hydrogen production reactor, the carbon dioxide absorption tower, the first gas-water separator, and the hydrogen storage tank are connected in sequence; the liquid inlet and the liquid outlet of the carbon dioxide absorption tower are connected to the absorption liquid regeneration tower through pipelines respectively The liquid outlet and the liquid inlet are connected; the absorption liquid regeneration tower, the second gas-water separator, the carbon dioxide storage tank, and the photobioreactor are connected in sequence through pipelines; the gas outlet of the anaerobic methanogenic reactor, the biogas desulfurization The tower, the biogas storage cabinet, the biogas generator set, the condenser, and the carbon dioxide storage tank are connected in turn through pipelines; the algae expansion tank and the mixing tank are connected through pipelines; It is connected through pipelines; the waste heat recovery and utilization system is connected with the biogas generator set, anaerobic hydrogen production reactor, anaerobic methane production reactor, photobioreactor and fertilizer processing plant through pipelines, which is used to recover the waste heat generated by biogas power generation, and Provide heat to anaerobic hydrogen production reactors, anaerobic methanogenic reactors, photobioreactors and fertilizer processing plants to realize temperature increase and heat preservation of reactors or drying of biogas residues; biogas residues produced by solid-liquid separation equipment are in the fertilizer After processing in the processing plant, it is used as solid organic fertilizer and applied to the energy grass planting base, and the harvested energy grass is stored in the raw material storage pool as a fermentation raw material.

A plurality of compartments are preferably arranged in the raw material storage pool, the number of compartments is determined according to the types of available raw materials, and each individual raw material is assigned a separate compartment.

The said pretreatment device is preferably selected from one or more combinations of grilles, crushers, pulverizers, and grit chambers.

Described anaerobic hydrogen production reactor and anaerobic methanogenic reactor are prior art conventional reactors, such as plug flow reactor (PFR), complete mixing reactor (CSTR), anaerobic contact reactor (ACR ), upflow anaerobic sludge bed (UASB), upflow solids reactor (USR), expanded granular sludge bed (EGSB), internal circulation anaerobic reactor (IC), external circulation anaerobic reactor ( EC), Anaerobic Sequencing Batch Reactor (ASBR), Baffled Reactor (ABR), Anaerobic Filter (AF), Fiber Packed Bed (FPB), Composite Anaerobic Reactor (UBF), Anaerobic Flow Chemical bed (FBR), anaerobic expanded bed (EBR), dry fermentation reactor (DA), etc.

The solid-liquid separation equipment is preferably selected from one or more combinations of extruding screw separators, horizontal centrifuges, high-speed centrifuges, filtration devices, microfiltration devices, and ultrafiltration devices.

The photobioreactor is preferably a closed photobioreactor, and is further preferably selected from a columnar photobioreactor or a tubular photobioreactor, a plate photobioreactor, a fermenter photobioreactor with a built-in light source, a light guide Fiber Photobioreactor.

Carbon dioxide absorption liquid is housed in the described carbon dioxide absorption tower, and this carbon dioxide absorption liquid is water, Selexol (main component is dimethyl polyethylene glycol), monoethanolamine, diethanolamine, triethanolamine or alkali solution (NaOH, KOH, Ca(OH)2), preferably a solution of Selexol and monoethanolamine.

The absorption liquid in the absorption liquid regeneration tower is regenerated through double treatment of heating and air stripping.

The system for energy utilization of carbon dioxide zero-emission organic waste of the present invention has the following operating steps:

(1) Raw material collection and pretreatment: Collect various organic wastes and store them in raw material storage pools, and use pretreatment devices to perform pretreatments such as impurity removal, crushing, crushing, and sand removal on various organic wastes, and crush them to particle size ≤20mm;

(2) Hydrogen production by anaerobic fermentation and hydrogen purification: mix pretreated organic wastes, hydrogen production inoculum and water in the hydrogen production adjustment tank to ensure the total solids of the materials entering the anaerobic hydrogen production reactor Concentration (TS)≤30%; control the temperature of the anaerobic fermentation hydrogen production reaction at 30-56°C, pH 4.5-6.5, and material residence time of 2-5 days; in the anaerobic hydrogen production reactor, organic waste H ₂ and CO ₂ are fermented under the action of hydrolyzing hydrogen-producing acid-producing bacteria, and the hydrogen-producing residue enters the subsequent biogas fermentation process; the generated H ₂ and CO ₂ gas mixture passes through the CO ₂ absorption liquid in the carbon dioxide absorption tower and the first The gas-water separator removes CO ₂ and water to obtain pure hydrogen, which is stored in a hydrogen storage tank; the saturated CO ₂ absorption liquid is regenerated in the absorption liquid regeneration tower through double treatment of heating and air stripping, and the absorption liquid The mixture of CO ₂ and air escaped from the process is dehydrated by the second gas-water separator and stored in the carbon dioxide storage tank, so as to be biologically fixed by microalgae in the subsequent process;

(3) Biogas fermentation and biogas power generation: the hydrogen production residue and the methanogenic inoculum are mixed in the methanogenic adjustment tank and then enter the anaerobic methanogenic reactor to generate biogas under the action of methanogenic bacteria (the main components are CH ₄ and CO ₂ ), the temperature of biogas fermentation is controlled to be 30-56°C, the pH is 6.5-7.8, and the residence time is 10-30 days; the residue of biogas fermentation is separated into biogas residue and biogas slurry after solid-liquid separation by solid-liquid separation equipment; The generated biogas is desulfurized by the biogas desulfurization tower and stored in the biogas storage cabinet. The biogas is used for biogas power generation through the biogas generator set, and the flue gas (mainly carbon dioxide, air, water vapor) discharged after the biogas power generation is condensed and dehydrated by the condenser Finally, it is stored in a carbon dioxide storage tank so that it can be biologically fixed by microalgae in the subsequent process;

(4) Biogas slurry treatment and microalgae fixation of carbon dioxide: The biogas slurry after solid-liquid separation contains soluble nitrogen, phosphorus, sulfur, inorganic salts, trace elements, vitamins and other nutrients, and is directly used as a complete nutrient medium for microalgae. The biogas slurry passes through the biogas slurry adjustment tank and the inoculated algae solution expanded by the algae seed expansion tank is mixed in the mixing tank and then enters the photobioreactor. Using CO ₂ from the carbon dioxide storage tank as the carbon source, the photosynthesis is carried out automatically. The cultivation of microalgae culture in the way of growing and fixing _CO2 , the temperature of microalgae culture is controlled at 20-40°C, the light intensity is 1000-8000Lux, the sun or artificial light source is continuously illuminated for 24 hours, and the air ratio is adjusted to control the _CO2 concentration in the intake air 1% to 40%; after 2 to 4 weeks of cultivation, the algae liquid is transported to the air flotation tank for air flotation treatment, and the high concentration microalgae pulp is stored in the raw material as the raw material for anaerobic fermentation hydrogen production and biogas fermentation Storage pool; dilute algae liquid with lower concentration is used as inoculation algae liquid;

(5) Biogas residue processing and energy grass planting: The biogas residue after solid-liquid separation contains nitrogen, phosphorus, sulfur, inorganic salts, trace elements, vitamins and other nutrients required for plant growth, and is dried and dried in a fertilizer processing plant. After crushing, it is transported to the energy grass planting base for application as solid organic fertilizer to ensure that the moisture content of the dried biogas residue is 20% to 35%. After 2 to 6 months of growth, the energy grass is harvested and used as an anaerobic fermentation system. The raw materials for hydrogen and biogas fermentation are stored in the raw material storage pool;

(6) Waste heat recovery and utilization: The large amount of waste heat generated in step (3) biogas power generation is recovered through the waste heat recovery system, and used for temperature increase and heat preservation of anaerobic hydrogen production reactor, temperature increase and heat preservation of anaerobic methanogenesis reactor, photobioreactor heat preservation Warm heat preservation, and biogas residue drying.

Compared with prior art, the beneficial effect of the present invention is:

The invention organically combines multiple technologies such as anaerobic fermentation hydrogen production, biogas fermentation, CO ₂ absorption, microalgae fixation of CO ₂ , biogas slurry treatment, and energy grass planting, so that they support and depend on each other, forming a carbon dioxide zero A system for energy utilization of emission-type organic waste. The system uses organic waste as raw material to obtain hydrogen and electricity through anaerobic fermentation technology and biogas power generation technology; Microalgae are used to fix CO ₂ produced by hydrogen and electricity in situ, and algae biomass is used as a raw material for energy production; biogas residue is used as a fertilizer for energy grass, and energy grass is used as a raw material for energy production, realizing the integration of the entire system Resource recycling utilizes production capacity and does not emit CO ₂ greenhouse gases. Compared with the single anaerobic fermentation hydrogen production technology, the anaerobic fermentation co-production hydrogen and methane process greatly improves the energy recovery efficiency; compared with the single biogas power generation technology, the biogas power generation + CO ₂ microalgae immobilization process avoids the CO ₂ greenhouse gas Emissions; Compared with the single microalgae fixation _CO2 technology, the biogas slurry treatment + _CO2 microalgae fixation process reduces the cost of microalgae cultivation, because the biogas slurry is used as a complete nutrient medium for microalgae cultivation.

The system of the present invention is suitable for processing various types of organic wastes, and can be applied to the treatment of agricultural organic wastes, industrial organic wastes, domestic organic wastes, sludge, etc., and new energy development industries. Through the application of the present invention, it can implement The specific application demonstration of circular economy can obtain clean energy while eliminating environmental pollution, and there is no greenhouse gas emission in the process, and can achieve the triple effect of waste treatment, clean and renewable energy production, and carbon dioxide emission reduction.

Description of drawings

Fig. 1 is a schematic flow chart of the system of the present invention

Explanation of reference signs: 1-raw material storage tank, 2-pretreatment device, 3-hydrogen production adjustment tank, 4-anaerobic hydrogen production reactor, 5-methanation adjustment tank, 6-anaerobic methanation reactor, 7 -Solid-liquid separation equipment, 8-biogas slurry adjustment tank, 9-mixing tank, 10-photobioreactor, 11-air flotation tank, 12-algae expansion tank, 13-carbon dioxide absorption tower, 14-absorbing liquid Regeneration tower, 151-first gas-water separator, 152-second gas-water separator, 16-carbon dioxide storage tank, 17-hydrogen storage tank, 18-biogas desulfurization tower, 19-biogas storage cabinet, 20-biogas generator set , 21 - condenser.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example 1:

Referring to Figure 1, the system for energy utilization of carbon dioxide zero-emission organic waste in this embodiment includes a raw material storage pool 1, a pretreatment device 2, a hydrogen production adjustment pool 3, an anaerobic hydrogen production reactor 4, and a methane production adjustment pool 5. Anaerobic methanogenic reactor 6, solid-liquid separation equipment 7, biogas slurry adjustment tank 8, mixing tank 9, photobioreactor 10, air flotation tank 11, algae expansion tank 12, carbon dioxide absorption tower 13, Absorption liquid regeneration tower 14, first gas-water separator 151, second gas-water separator 152, carbon dioxide storage tank 16, hydrogen storage tank 17, biogas desulfurization tower 18, biogas storage cabinet 19, biogas generator set 20, condenser 21 , waste heat recovery and utilization system, fertilizer processing plant, energy grass planting base, the raw material storage pool 1, pretreatment device 2, hydrogen production adjustment pool 3, anaerobic hydrogen production reactor 4, methane production adjustment pool 5, anaerobic Methanogenic reactor 6, solid-liquid separation equipment 7, biogas slurry regulating tank 8, mixing tank 9, photobioreactor 10, and air flotation tank 11 are connected in sequence; the gas outlet of the anaerobic hydrogen production reactor 4, The carbon dioxide absorption tower 13, the first gas-water separator 151, and the hydrogen storage tank 17 are connected in sequence; the liquid inlet and the liquid outlet of the carbon dioxide absorption tower 13 are respectively connected with the liquid outlet and the inlet of the absorption liquid regeneration tower 14 through pipelines. The liquid port is connected; the absorption liquid regeneration tower 14, the second gas-water separator 152, the carbon dioxide storage tank 16, and the photobioreactor 10 are sequentially connected through pipelines; the gas outlet of the anaerobic methanogenic reactor 6, the biogas desulfurization tower 18, and the biogas The storage cabinet 19, the biogas generator set 20, the condenser 21, and the carbon dioxide storage tank 16 are connected in sequence through pipelines; the algae expansion tank 12 and the mixing tank 9 are connected through pipelines; 1 and the mixing tank 9 are connected through pipelines; the waste heat recovery system is connected with the biogas generator set 20, the anaerobic hydrogen production reactor 4, the anaerobic methane production reactor 6, the photobioreactor 10 and the fertilizer processing field respectively through pipelines, It is used to recover the waste heat generated by biogas power generation, and supply heat to anaerobic hydrogen production reactor 4, anaerobic methanation reactor 6, photobioreactor 10 and fertilizer processing plant to realize the temperature increase and heat preservation of the reactor or the drying of biogas residue The biogas residue produced by the solid-liquid separation equipment 7 is processed in the fertilizer processing plant and applied to the energy grass planting base as solid organic fertilizer, and the harvested energy grass is stored in the raw material storage pool 1 as a fermentation raw material. Two compartments are set in the raw material storage pool 1, the pretreatment device 2 is a crusher, and the anaerobic hydrogen production reactor 4 and the anaerobic methanogenic reactor 6 are respectively plug flow reactors (PFR) and complete mixing reactor (CSTR), the solid-liquid separation equipment 7 is an extrusion screw separator, and the photobioreactor is a columnar photobioreactor. Selexol is installed in the tower 13 as a carbon dioxide absorbing liquid.

For a better understanding of the present invention, the system operation process in the specific embodiment is described below:

The organic waste in this embodiment is livestock and poultry manure (pig manure) and crop straw (rice straw), the microalgae is Chlorella sorokiniana, and the energy grass is hybrid pennisetum. The steps are as follows:

(1) Raw material collection and pretreatment: collect pig manure and rice straw respectively and store them in the two compartments of the raw material storage pool 1, and use the crusher 2 to crush the straw to a particle size ≤ 20mm;

(2) Anaerobic fermentation hydrogen production and hydrogen purification: collect anaerobic activated sludge from the biogas digester, heat it at 80°C for 60 minutes as the hydrogen production inoculum, and transfer the crushed straw and pig manure to the hydrogen production adjustment tank 3, according to Add hydrogen-producing inoculum to 20% of the total mass of straw and pig manure, and add water to adjust the total solids concentration (TS) of the mixed material to 30%; transport the above-mentioned mixture to anaerobic hydrogen-producing reactor 4 for hydrogen-producing fermentation, and control the fermentation temperature 56°C, pH range 4.5-6.5, after 5 days of hydrogen-producing fermentation, the residue is transported to the methanogenic adjustment tank 5; the _H2 and _CO2 gas mixture produced by anaerobic fermentation is transported to the carbon dioxide absorption tower 13, and the Selexol The CO ₂ in the mixed gas is absorbed as the absorption liquid, and the remaining H ₂ is dehydrated by the first gas-water separator 151 and then stored in the hydrogen storage tank 17; the absorption liquid reaches saturation after a period of time, and at this time, it is pumped to the absorption liquid regeneration tower 14 for regeneration, use air to blow off the absorption liquid from the bottom of the absorption liquid regeneration tower 14 under boiling conditions to carry CO ₂ out so that the absorption liquid is regenerated, and the mixture of CO ₂ and air is dehydrated by the second gas-water separator 152 and stored in the carbon dioxide storage tank 16, so that the microalgae in the follow-up process carry out biological fixation;

(3) Biogas fermentation and biogas power generation: collect the anaerobic activated sludge from the biogas tank as the methanogenic inoculum, add it to the methanogenic regulating tank 5 according to 20% of the total mass of the hydrogen production residue and mix it evenly, Transport the mixture to the anaerobic methanogenic reactor 6 for biogas fermentation, control the fermentation temperature to 56°C, and pH 6.5 to 7.8, and after 30 days of biogas fermentation, use the solid-liquid separation equipment 7 to separate the residue from solid to liquid; The generated biogas (mainly CH ₄ and CO ₂ ) is desulfurized by the biogas desulfurization tower 18 and then stored in the biogas storage tank 19, and then the biogas generating unit 20 is used to generate electricity. The flue gas (mainly carbon dioxide, air , water vapor) is stored in the carbon dioxide storage tank 16 after being dehydrated by the condenser 21, so that the microalgae in the follow-up process carry out biological fixation;

(4) Biogas slurry treatment and microalgae fixation of carbon dioxide: the biogas slurry after solid-liquid separation contains soluble nitrogen, phosphorus, sulfur, inorganic salts, trace elements, vitamins and other nutrients, which can be directly used as thermotolerant chlorella ( Chlorella sorokiniana) full nutrient medium; the thermotolerant chlorella is cultured in the algae expansion tank 12 for 1 week and then transported to the mixing tank 9 as an inoculum algae liquid to fully mix with the biogas slurry regulated by the biogas slurry adjustment tank 8 , and the mixed solution is pumped into the photobioreactor 10; the CO2+air mixture from the carbon dioxide storage tank 16 enters from the air inlet of the photobioreactor 10, and the temperature of the photobioreactor 10 is controlled to be 20° C., and the light intensity is 1000 ～2000Lux, the sun or artificial light source (used during cloudy day and night) continuously illuminates for 24 hours, and regulates the _CO concentration in the intake air to be 1%; thermotolerant Chlorella utilizes biogas slurry, Light and _CO2 are used as nutrient source, energy source and carbon source to carry out photoautotrophic growth, fix _CO2 and generate algae biomass; Flotation treatment, the microalgae pulp with higher concentration of microalgae in the upper part of the air flotation tank 11 is transported to the raw material storage tank 1 as the raw material for hydrogen production by anaerobic fermentation and biogas fermentation; the dilute algae liquid in the lower part of the air flotation tank 11 is returned to the mixing tank 9 As the inoculum liquid for the next cultivation batch;

(5) Biogas residue processing and energy grass planting: The biogas residue produced by the solid-liquid separation equipment 7 contains nitrogen, phosphorus, sulfur, inorganic salts, trace elements, vitamins and other nutrients required for plant growth, and is carried out in the fertilizer processing plant. After drying and crushing, it is transported to the hybrid pennisetum planting base and used as solid organic fertilizer to ensure that the moisture content of the dried biogas residue is 20% to 35%. After 6 months of growth, it is harvested and used as anaerobic fermentation The raw materials for hydrogen production and biogas fermentation are stored in the raw material storage pool 1;

(6) Waste heat recovery and utilization: use the heat exchanger to recover a large amount of waste heat generated during the biogas power generation in step (3), and use the recovered heat energy for the anaerobic hydrogen production reactor 4 temperature increase and heat preservation, and the anaerobic methane production reactor 6 temperature increase and heat preservation, photobioreactor 10 temperature increase and heat preservation, and biogas residue drying.

Applying the carbon dioxide zero-emission type organic waste energy utilization system of this embodiment, operating according to the above-mentioned process, can obtain clean energy _H2 and electric energy while eliminating organic waste, and there is no greenhouse gas emission during this process, It can achieve the triple effect of waste treatment, clean and renewable energy production, and carbon dioxide emission reduction.

Finally, it should also be noted that the above examples are only specific implementation examples of the present invention. Apparently, the present invention is not limited to the above examples, and many variations are possible. All deformations that can be directly derived or associated by those skilled in the art from the content disclosed in the present invention should be considered as the protection scope of the present invention.

Claims (7)

1. the system of a carbon dioxide zero discharge type organic waste recovery energy, it is characterized in that, comprise raw material storage pond (1), pretreatment unit (2), produce hydrogen regulating reservoir (3), anaerobic hydrogen-generating reactor (4), produce methane and reconcile pond (5), anaerobism methane-producing reactor (6), solid-liquid separating equipment (7), natural pond liquid regulating reservoir (8), mixing pond (9), bioreactor (10), air flotation tank (11), algae kind spread cultivation jar (12), carbon dioxide absorption tower (13), regeneration of absorption solution tower (14), first moisture trap (151), second moisture trap (152), carbon dioxide storage tank (16), hydrogen-holder (17), biogas desulfurization tower (18), biogas storage cabinet (19), marsh gas power generation unit (20), condenser (21), the heat recovery system, the fertilizer processing space, energy grass planting base, described raw material storage pond (1), pretreatment unit (2), produce hydrogen regulating reservoir (3), anaerobic hydrogen-generating reactor (4), produce methane and reconcile pond (5), anaerobism methane-producing reactor (6), solid-liquid separating equipment (7), natural pond liquid regulating reservoir (8), mixing pond (9), bioreactor (10), air flotation tank (11) links to each other successively; The gas vent of described anaerobic hydrogen-generating reactor (4), carbon dioxide absorption tower (13), first moisture trap (151), hydrogen-holder (17) link to each other successively; The inlet of described carbon dioxide absorption tower (13) and liquid outlet are communicated with by the liquid outlet and the inlet of pipeline with regeneration of absorption solution tower (14) respectively; Described regeneration of absorption solution tower (14), second moisture trap (152), carbon dioxide storage tank (16), bioreactor (10) are communicated with successively by pipeline; The gas vent of described anaerobism methane-producing reactor (6), biogas desulfurization tower (18), biogas storage cabinet (19), marsh gas power generation unit (20), condenser (21), carbon dioxide storage tank (16) are communicated with successively by pipeline; The algae kind spread cultivation jar (12) and mixing pond (9) be communicated with by pipeline; The upper and lower of air flotation tank (11) is communicated with by pipeline with raw material storage pond (1) and mixing pond (9) respectively; The heat recovery system links to each other with the fertilizer processing space with marsh gas power generation unit (20), anaerobic hydrogen-generating reactor (4), anaerobism methane-producing reactor (6), bioreactor (10) respectively by pipeline; Be applied to energy grass planting base as solid organic fertilizer through the natural pond slag that solid-liquid separating equipment (7) produces after the processing of fertilizer processing space, the energy grass that results obtain is stored in raw material storage pond (1) as fermentation raw material.

2. the system of carbon dioxide zero discharge type organic waste recovery energy according to claim 1 is characterized in that, in the described raw material storage pond (1) a plurality of compartments is set.

3. the system of carbon dioxide zero discharge type organic waste recovery energy according to claim 1 is characterized in that described pretreatment unit is selected from one or more combinations of grid, disintegrating machine, pulverizer, settling pit.

4. the system of carbon dioxide zero discharge type organic waste recovery energy according to claim 1, it is characterized in that described anaerobic hydrogen-generating reactor (4) or anaerobism methane-producing reactor (6) are plug flow reactor, complete mixing reactor, the anaerobism contact reactor, upflow anaerobic sludge blanket process, the up-flow solid reactor, expanded granular sludge bed, internal-circulation anaerobic reactor, the outer circulation anaerobic reactor, the anaerobic batch reactor, baffled reactor, anaerobic filter, the fiberfill bed, hybrid anaerobic reactor, anaerobic fluidized bed, anaerobic expanded bed or dried fermentation reactor.

5. the system of carbon dioxide zero discharge type organic waste recovery energy according to claim 1, it is characterized in that described solid-liquid separating equipment (7) is selected from one or more combinations of squash type spiral separator, horizontal centrifugal separator, supercentrifuge, filter, micro-filtration, ultrafiltration apparatus.

6. the system of carbon dioxide zero discharge type organic waste recovery energy according to claim 1 is characterized in that described bioreactor (10) is a closed photo bioreactor.

7. the system of carbon dioxide zero discharge type organic waste recovery energy according to claim 6, it is characterized in that described closed photo bioreactor is column formula bioreactor, tubular type bioreactor, board-like bioreactor, built-in light-source fermentation pot type bioreactor or optical fiber bioreactor.

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