Biogas residue treatment system for realizing recycling and energy regeneration of agricultural wastes

Abstract

The utility model discloses a biogas residue treatment system capable of achieving agricultural waste recycling and energy regeneration, and relates to the field of agricultural waste treatment.The biogas residue treatment system comprises an excrement receiving pool and a straw feeding temporary storage box, the straw feeding temporary storage box is communicated with a mixing pool, the mixing pool is communicated with a vacuum feeder, and the vacuum feeder is communicated with a biogas digester; the vacuum feeder is communicated with an anaerobic fermentation system, the anaerobic fermentation system is communicated with a gas storage cabinet, the gas storage cabinet is further communicated with a dehydration unit, and the dehydration unit is communicated with a pyrolysis power system and a biogas slurry pond. The problems that in the anaerobic fermentation treatment technology, biogas residues are difficult to treat, and heating and heat preservation of an anaerobic system have extremely high requirements are solved, meanwhile, the problems that in the pyrolysis treatment technology, follow-up utilization of volatile components is difficult, agricultural waste with the high water content cannot be treated, and application is not wide enough are solved, and the environment cannot be affected.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of agricultural waste treatment, in particular to a biogas residue treatment system for realizing resourceization and energyization of agricultural waste. BACKGROUND

[0002] Agricultural waste, namely agricultural waste, refers to organic matter discarded in the entire agricultural production process. The agricultural waste commonly referred to by us mainly refers to crop straw and livestock and poultry manure.

[0003] At present, the technologies for resourceization and energyization of agricultural waste mainly include three types:

[0004] The first type is anaerobic fermentation technology. Anaerobic fermentation refers to the conversion of organic matter in waste into biogas, biogas residue and biogas slurry through microbial metabolism under anaerobic conditions. The advantages are that a large amount of waste can be treated and energy can be recovered. The disadvantages are that the biogas residue is difficult to handle, the heating and insulation of the anaerobic system have very high requirements, etc.

[0005] The second type is pyrolysis treatment technology. Pyrolysis is the conversion of organic matter in waste into biochar and volatile matter through high temperature and anaerobic conditions. The advantages are high conversion efficiency and reduction of greenhouse gas emissions. The disadvantages are that the subsequent utilization of volatile matter is difficult, the application is not widely used, and the agricultural waste with high water content cannot be treated, etc.

[0006] The third type is composting technology. Composting is to promote the decomposition and conversion of organic matter in waste by controlling temperature, humidity and ventilation, etc. to generate organic fertilizer. The advantages are simple operation, low cost and high quality organic fertilizer. The disadvantages are that odors and leachate and other pollutants are generated during composting, and improper treatment will affect the environment. CONTENT OF THE INVENTION

[0007] In order to solve the problems of biogas residue treatment difficulty, high requirements for heating and insulation of anaerobic system, difficulty in subsequent utilization of volatile matter, not widely used, unable to treat agricultural waste with high water content, and generation of odors and leachate and other pollutants during composting, which will affect the environment, the present application provides a biogas residue treatment system for realizing resourceization and energyization of agricultural waste.

[0008] The biogas residue treatment system for realizing resourceization and energyization of agricultural waste provided by the present application adopts the following technical scheme:

[0009] It comprises a manure receiving pool and a straw feeding temporary storage box. The straw feeding temporary storage box is communicated with a mixing pool. A vacuum feeder is communicated with the mixing pool. The vacuum feeder is communicated with an anaerobic fermentation system. The anaerobic fermentation system is communicated with a gas storage cabinet. The gas storage cabinet is also communicated with a dehydration unit. The dehydration unit is communicated with a pyrolysis power system and a biogas slurry pond.

[0010] By adopting the technical scheme, the fermentation liquid after gas production by anaerobic fermentation enters the dehydration unit for solid-liquid separation, the separated biogas slurry is stored in the biogas slurry pond and then irrigated and returned to the field, and the separated biogas residue enters the pyrolysis power system for deep treatment. The biogas residue is converted into biochar and volatile matter under high temperature and anaerobic conditions in the pyrolysis power system. The biochar can be used as a carbon-based flocculant for solid-liquid separation in the dehydration unit, which not only effectively utilizes the product biochar, but also saves the flocculant required by the dehydration unit.

[0011] Preferably, the feces receiving pool and the mixing pool are communicated.

[0012] By adopting the technical scheme, the feces receiving pool and the mixing pool are communicated.

[0013] Preferably, the vacuum feeder is connected to the inlet of the anaerobic fermentation system, and the anaerobic fermentation system and the mixing pool are communicated.

[0014] By adopting the technical scheme, the vacuum feeder is connected to the inlet of the anaerobic fermentation system, and the anaerobic fermentation system and the mixing pool are communicated.

[0015] Preferably, the pyrolysis power system is also communicated with the gas storage cabinet.

[0016] By adopting the technical scheme, the pyrolysis power system is also communicated with the gas storage cabinet.

[0017] Preferably, the pyrolysis power system and the dehydration unit are arranged in communication with each other.

[0018] By adopting the technical scheme, the pyrolysis power system and the dehydration unit are arranged in communication with each other.

[0019] In summary, the present application has at least one of the following beneficial technical effects:

[0020] The present application solves the problems of difficult biogas residue treatment, high requirements for heating and insulation of the anaerobic system, and the like in the anaerobic fermentation treatment technology, and solves the problems of difficult utilization of volatile matter, inability to treat agricultural waste with high water content, and the like in the pyrolysis treatment technology, and the application is not widely used, and the application does not affect the environment. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 Fig. 1 is a schematic diagram of the overall structure of a biogas residue treatment system for realizing resourceization and energyization of agricultural waste according to an embodiment of the present application.

[0022] Fig. 2 The embodiment of the present application mainly embodies the schematic diagram of the front-end part structure;

[0023] Fig. 3 The embodiment of the present application mainly embodies the schematic diagram of the back-end part structure;

[0024] Reference signs: 1, feces receiving pool; 2, straw feeding temporary storage box; 3, mixing pool; 4, vacuum feeder; 5, anaerobic fermentation system; 6, gas storage tank; 7, dehydration unit; 8, pyrolysis power system; 9, biogas slurry pond. DETAILED DESCRIPTION

[0025] The following will be combined with the accompanying Figs. 1-3 The present application is further described in detail.

[0026] The embodiment of the present application discloses a biogas residue treatment system for realizing agricultural waste resourceization and energyization, which comprises a feces receiving pool 1 and a straw feeding temporary storage box 2, the straw feeding temporary storage box 2 and a mixing pool 3 are communicated, the size of the straw feeding temporary storage box 2 should be designed according to actual needs, and the straw feeding temporary storage box 2 can be designed into common standard size dimensions including 1000mm×800mm×700-1000mm and 1200mm×800mm×700-1000mm, these dimensions are suitable for storing medium or large items, the height can be adjusted according to actual needs, the material of the temporary storage box should be selected from durable and easy-to-clean materials to ensure the convenience of long-term use and maintenance, common materials include metal and plastic, the mixing pool 3 is communicated with a vacuum feeder 4, the vacuum feeder 4 is communicated with an anaerobic fermentation system 5, and the working process of the anaerobic fermentation system 5 is as follows:

[0027] 1. Pretreatment

[0028] In the anaerobic fermentation process, pretreatment is a very important link. Through pretreatment, waste materials can be converted into materials that are more easily utilized by anaerobic bacteria, which can improve the efficiency of anaerobic reaction. Common pretreatment methods include:

[0029] (1) Physical method: including crushing, mixing, etc., which can make the material more easily contact with microorganisms.

[0030] (2) Chemical method: including adjusting pH value, adding chemical reagents, etc., which can change the chemical properties of the material, so that it is more easily utilized by anaerobic bacteria.

[0031] (3) Heat treatment: including high-temperature sterilization, low-temperature disinfection, etc., which can eliminate substances that inhibit the growth of microorganisms.

[0032] 2. Anaerobic reaction

[0033] After pretreatment, the waste material can enter the anaerobic reaction stage. The anaerobic reaction generally consists of three stages: acidification stage, acetic acid acidification stage, and methane fermentation stage.

[0034] (1) Acidification stage: In this stage, the waste material is decomposed into organic acids such as lactic acid, propionic acid, acetic acid, etc. by the metabolism of anaerobic bacteria.

[0035] (2) Acetic acid acidification stage: In this stage, acetic acid is hydrolyzed into ethanol and carbon dioxide by the metabolism of anaerobic bacteria, and some organic acids continue to be produced.

[0036] (3) Methane fermentation stage: In this stage, the produced ethanol and organic acids are converted into methane and carbon dioxide in the process of anaerobic bacterial metabolism. The final product of this stage is mainly methane, and some by-products are also produced.

[0037] The anaerobic fermentation system 5 is connected to a gas storage tank 6, and the gas storage tank 5 is also connected to a dehydration unit 7,

[0038] The working process of the dehydration unit 7 is as follows:

[0039] After the feeding is completed, the solid-liquid dry-wet separator can be started. Before starting the equipment, the status of each part and the parameter settings of the equipment should be confirmed again. After starting, the running condition of the equipment should be observed, such as the rotation of the motor, the tightness of the transmission belt, the vibration of the screen, etc. If there is any abnormal situation, the equipment should be stopped immediately for inspection and treatment.

[0040] After the equipment is started, the material is separated on the screen. During the separation process, solid particles are intercepted by the screen and discharged upward, while liquid flows out through the screen. In order to ensure the separation effect, the residual material on the screen should be cleaned regularly to prevent clogging. At the same time, the parameters of the equipment should be adjusted, such as the amplitude, frequency and inclination angle of the screen, to adapt to different properties of the material and processing requirements,

[0041] After the separation is completed, the solid and liquid are discharged through different outlets. During the discharging process, the flow rate of the discharge port and the properties of the material should be observed to ensure smooth discharging and meet the processing requirements. If necessary, a collection container or pipeline can be installed at the discharge port for subsequent processing and utilization.

[0042] The dehydration unit 7 is connected to a pyrolysis power system 8 and a biogas slurry pond 9. The feces receiving pool 1 and the mixing pool 3 are connected, the vacuum feeder 4 is connected to the inlet of the anaerobic fermentation system 5, the anaerobic fermentation system 5 and the mixing pool 3 are connected, the pyrolysis power system 8 is also connected to the gas storage tank 5, and the pyrolysis power system 8 and the dehydration unit 7 are connected to each other;

[0043] 105t / d of cow dung (containing solid rate 25%) is first poured into the effective volume of 100m3 dung receiving pool 1, and then sent to the effective volume of 200m3 mixing pool 3 through the conveying equipment. 55t / d of corn straw (containing solid rate 70%) is first sent to the straw feeding temporary storage box 2, and then sent to the effective volume of 200m3 mixing pool 3 through the conveying equipment. The straw, dung and backflow liquid are first mixed in the mixing pool, and then sent to the anaerobic fermentation system 5 through the vacuum feeder 4. The anaerobic fermentation system 5 is provided with two anaerobic fermentation tanks with an effective volume of 5000m3. The anaerobic fermentation produces 20000m3 / d of biogas which is stored in the gas storage tank 6 with a volume of 2000m3. 235t / d of fermentation liquid after anaerobic fermentation is sent to the dehydration unit 7 for solid-liquid separation. 25t / d of biogas slurry is separated out and stored in the biogas slurry pond 9 for irrigation and returning to the field. 110t / d of biogas residue is sent to the pyrolysis power system 8 for deep treatment. The biogas residue is converted into 25t / d of biochar and 85t / d of volatile matter in the pyrolysis power system 8 under high temperature and anaerobic conditions. The 25t / d of biochar can be used as a carbon-based flocculant for solid-liquid separation in the dehydration unit 7, which not only effectively utilizes the product biochar, but also saves the flocculant required by the dehydration unit 7, greatly saving the operation cost of the whole system. The 85t / d of volatile matter is further combusted in the pyrolysis power system 8 to generate steam to heat the whole system, solving the requirement of heating and heat preservation of the whole system.

[0044] The implementation principle of the biogas residue treatment system for realizing agricultural waste resourceization and energyization is as follows: the livestock and poultry dung of the agricultural waste is first poured into the dung receiving pool 1, and then sent to the mixing pool 3 through the conveying equipment. The straw of the agricultural waste is first sent to the straw feeding temporary storage box 2, and then sent to the mixing pool 3 through the conveying equipment. The straw, dung and backflow liquid are first mixed in the mixing pool, and then sent to the anaerobic fermentation system 5 through the vacuum feeder 4. The biogas produced by anaerobic fermentation is stored in the gas storage tank 6. The fermentation liquid after anaerobic fermentation is sent to the dehydration unit 7 for solid-liquid separation. The separated biogas slurry is stored in the biogas slurry pond 9 for irrigation and returning to the field. The separated biogas residue is sent to the pyrolysis power system 8 for deep treatment. The biogas residue is converted into biochar and volatile matter in the pyrolysis power system 8 under high temperature and anaerobic conditions. The biochar can be used as a carbon-based flocculant for solid-liquid separation in the dehydration unit 7, which not only effectively utilizes the product biochar, but also saves the flocculant required by the dehydration unit 7, greatly saving the operation cost of the whole system. The volatile matter is further combusted in the pyrolysis power system 8 to generate steam to heat the whole system, solving the requirement of heating and heat preservation of the whole system.

[0045] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application. Any equivalent changes made according to the structure, shape and principle of the present application should be covered by the protection scope of the present application.

Claims

1. A biogas residue treatment system for realizing the resource recovery and energy conversion of agricultural waste, characterized in that: It comprises a feces receiving pool (1) and a straw feeding temporary storage box (2), the straw feeding temporary storage box (2) and a mixing pool (3) are communicated, a vacuum feeder (4) is communicated on the mixing pool (3), an anaerobic fermentation system (5) is communicated on the vacuum feeder (4), a gas storage tank (6) is communicated on the anaerobic fermentation system (5), the gas storage tank (6) is also communicated with a dewatering unit (7), the dewatering unit (7) is communicated with a pyrolysis power system (8) and a biogas slurry pond (9).

2. The biogas residue treatment system for realizing agricultural waste resource and energy according to claim 1, characterized in that: The feces receiving pool (1) and the mixing pool (3) are communicated.

3. The biogas residue treatment system for realizing agricultural waste resource and energy according to claim 2, characterized in that: The vacuum feeder (4) is connected to the entrance of the anaerobic fermentation system (5), the anaerobic fermentation system (5) and the mixing pool (3) are communicated.

4. The biogas residue treatment system for realizing agricultural waste resource and energy according to claim 3, characterized in that: The pyrolysis power system (8) is also communicated with the gas storage tank (6).

5. The biogas residue treatment system for realizing agricultural waste resource and energy according to claim 1, characterized in that: The pyrolysis power system (8) and the dewatering unit (7) are communicated with each other.

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