Straw and excrement high-temperature anaerobic fermentation system

Abstract

The invention provides a straw and manure high-temperature anaerobic fermentation system, and relates to the technical field of straw fermention.The straw and manure high-temperature anaerobic fermentation system comprises a hydrolysis and sand removal system, a fermentation system and a separation system.The manure and straw can be added into the hydrolysis and sand removal system for hydrolysis, gravel is removed, and a first mixture is formed; the first mixture enters the fermentation system to be fermented to form biogas and generate a second mixture and scum, the scum enters the separation system to separate organic fertilizer, and the second mixture returns to the hydrolysis desanding system to be desanded and then returns to the fermentation system to be continuously fermented; according to the method, the high-temperature water and aerobic strains are adopted, so that the degradation rate of the straws is remarkably increased, the utilization rate of the straws is effectively increased, the use of chemical agents is avoided, and no chemical dangerous waste liquid is generated; through high-temperature anaerobic fermentation, the killing rate of parasitic ova is remarkably increased, and the fermentation time is shortened.

Description

Technical Field

[0001] The invention relates to the technical field of straw fermentation, and in particular to a high-temperature anaerobic fermentation system of straw and excrement. Background Art

[0002] With the adjustment of energy structure, methane fermentation engineering has shifted from "focusing on environmental governance" to "focusing on energy production"; crop straw is rich in cellulose, hemicellulose, lignin and other components, and its high carbon content can provide carbon nutrition for microorganisms, while the nitrogen-containing substances in livestock manure can provide nitrogen nutrition for bacteria; currently, straw and manure are used as fermentation raw materials, and most of them use chemical agents and high-temperature pyrolysis methods to pre-treat the straw, and then combine medium and low temperature anaerobic fermentation technology for biogas fermentation; however, this technology uses a large amount of chemical agents, the waste liquid generated is dangerous, the energy consumption required is also relatively prominent, and the entire fermentation cycle is relatively long.

[0003] To solve the above problems, the present invention proposes a high-temperature anaerobic fermentation technology for a mixture of straw and manure, which solves the problems of high energy consumption, low straw utilization, low gas production rate, long fermentation cycle, etc., and avoids the use of chemical agents. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a high-temperature anaerobic fermentation system of straw and excrement to solve the problems of low straw fermentation efficiency and high pollutants.

[0005] Based on the technical problems existing in the background technology, the present invention proposes a high-temperature anaerobic fermentation system for straw and manure, including a hydrolysis and grit removal system, a fermentation system and a separation system, wherein manure and straw are added to the hydrolysis and grit removal system for hydrolysis, and the grit is removed to form a first mixture, the first mixture enters the fermentation system for fermentation to form biogas and produce a second mixture and scum, the scum enters the separation system to separate organic fertilizer, and the second mixture returns to the hydrolysis and grit removal system for grit removal and then returns to the fermentation system for continued fermentation.

[0006] Preferably, the hydrolysis and sand removal system includes a straw crushing device, a hydrolysis tank, a sand settling tank, a homogenization tank, and a sand settling tank. The straw crushing device and the homogenization tank are connected to the hydrolysis tank, the hydrolysis tank is connected to the sand settling tank, and the hydrolysis tank is connected to the sand settling tank and the sand settling tank in sequence.

[0007] Preferably, the fermentation system comprises a high-temperature anaerobic fermentation tank, and the high-temperature anaerobic fermentation tank is connected to the hydrolysis tank and the grit tank respectively.

[0008] Preferably, the separation system comprises a discharge tank, a deliquation machine, and a biogas slurry temporary storage tank. The discharge tank is connected to a grit settling tank, and the discharge tank is respectively connected to the deliquation machine and the biogas slurry temporary storage tank.

[0009] Preferably, the biogas slurry temporary storage tank is also connected to a hydrolysis tank.

[0010] Compared with the prior art, the straw and manure high temperature anaerobic fermentation system proposed by the present invention adopts the above technical solution and achieves the following technical effects:

[0011] The present invention adopts high-temperature water and aerobic bacteria to significantly improve the degradation rate of straw, improve the utilization rate of straw to a limited extent, avoid the use of chemical agents, and no chemical hazardous waste liquid is generated; through high-temperature anaerobic fermentation, the killing rate of parasite eggs is significantly improved and the fermentation time is shortened; the present invention uses solar energy and a heat pump unit in combination to significantly reduce the energy consumption of hydrolysis and fermentation, and can sustainably maintain the temperature of the hydrolysis tank and the fermentation tank; the present invention can process various types of livestock and poultry manure and old straw. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a system relationship diagram of the present invention.

[0013] In the figure: 100, hydrolysis and sand removal system; 200, fermentation system; 300, separation system; 2, straw crushing device; 3, hydrolysis tank; 7, sand settling tank; 9, homogenization tank; 11, sand settling tank; 4, high-temperature anaerobic fermentation tank; 5, discharge tank; 6, deliquation machine; 13, biogas slurry temporary storage tank. DETAILED DESCRIPTION

[0014] In the present invention, unless otherwise clearly specified and 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 one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0015] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0016] Example

[0017] Please refer to Figure 1The present invention proposes a high-temperature anaerobic fermentation system for straw and manure, including a hydrolysis and sand removal system 100, a fermentation system 200 and a separation system 300, wherein manure and straw are added to the hydrolysis and sand removal system 100 for hydrolysis, and the hydrolysis system receives crushed straw and manure after homogenization, and then removes sand and impurities after hydrolysis by the hydrolysis system to obtain a first mixture, which is put into the fermentation system 200 for fermentation to generate biogas. During the fermentation process, the straw and manure will also produce gravel or debris, and after fermentation, enter the hydrolysis and sand removal system 100 for sand settling to obtain a second mixture and scum, wherein the second mixture is straw and manure that have not been fermented completely, and this process can remove fermented impurities and improve the fermentation rate, and the scum will enter the separation system 300 to separate organic fertilizer, and since the scum is separated from the fermentation system 200, it will also contain liquid, and the scum will be separated into solid and liquid, and the liquid will be sent to the hydrolysis and sand removal system 100 for utilization, and the solid will be made into organic fertilizer.

[0018] In a specific embodiment, refer to Figure 1 The hydrolysis and desanding system 100 includes a straw crushing device 2, a hydrolysis tank 3, a grit tank 7, a homogenization tank 9, and a grit tank 11. The straw crushing device 2 is used to receive straw for crushing, and send the crushed straw to the hydrolysis tank 3 for hydrolysis through a belt conveyor. The raw materials of the straw are mainly wheat straw and corn straw. The homogenization tank 9 is used to dilute the manure, which is cow manure, chicken manure and duck manure in the farm. It will be diluted with biogas slurry. The biogas slurry is the liquid separated from the separation system 300. Under normal circumstances, after the manure is diluted, the solid content thereof needs to reach about 8-10%. After the manure is diluted, it is sent to the hydrolysis tank 3 for hydrolysis, and the hydrolysis tank 3 will continue to add The solid content in the biogas slurry hydrolysis tank 3 is adjusted to about 10% to 12%, and the hydrolysis temperature is controlled to be 49 to 51°C in the high-temperature anaerobic fermentation tank and the pH value is 6.8 to 7.5. An aeration fan is used to intermittently aerate to create an aerobic environment, so that the aerobic bacteria decompose the wax layer of the straw to produce sugar. After hydrolysis for about 24 hours in the straw crushing device, a first mixture is formed, which is then transported to the high-temperature anaerobic fermentation tank 4 in the fermentation system 200 through a material feed pump. The bottom material at the bottom of the hydrolysis tank 3 is transported to the grit tank 7 for desanding, and the supernatant in the grit tank 7 is refluxed to the hydrolysis tank 3; the temperature of the entire hydrolysis tank 3 is maintained by hot water, and the hot water heat source is provided by solar energy and a heat pump unit.

[0019] In a specific embodiment, refer to Figure 1The fermentation system 200 includes a high-temperature anaerobic fermentation tank 4, which can receive the first mixture for fermentation. The high-temperature anaerobic fermentation tank 4 evenly mixes the first mixture under the action of the agitator, adjusts the solid content in the high-temperature anaerobic fermentation tank 4 to 10%, the pH value to 6.8-7.5, the stirring frequency to the discharge tank 50hz, the liquid level in the high-temperature anaerobic fermentation tank 4 to about 21.4m, the fermentation temperature to the discharge tank 51°C, the fermentation tank pressure to 0.5KPa-1.5KPa, and the fermentation residence time to 15-20 days. The material in the high-temperature anaerobic fermentation tank 4 will be desanded through the sand settling tank 11. After desanding, it will flow back to the high-temperature anaerobic fermentation tank 4 through the reflux pump to continue fermentation.

[0020] In a specific embodiment, refer to Figure 1 The separation system 300 includes a discharge tank 5, a deliquidator 6, and a biogas slurry temporary storage tank 13. After the sand settling tank 11 removes sand from the material in the high-temperature anaerobic fermentation tank 4, the scum-containing material is transported to the discharge tank 5 for solid-liquid separation, and then deliquidated by the deliquidator 6 and sent to the organic fertilizer workshop to make solid organic fertilizer. The liquid deliquidated by the deliquidator 6 is biogas slurry, which will be placed in the biogas slurry temporary storage tank 13 for storage. The biogas slurry temporary storage tank 13 can provide biogas slurry for the hydrolysis tank 3 and the homogenization tank 9.

[0021] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A high temperature anaerobic fermentation system for straw and excrement, characterized in that: The invention comprises a hydrolysis and grit removal system (100), a fermentation system (200) and a separation system (300), wherein manure and straw are added to the hydrolysis and grit removal system (100) for hydrolysis, and the grit is removed to form a first mixture, the first mixture enters the fermentation system (200) for fermentation to form biogas and generate a second mixture and scum, the scum enters the separation system (300) to separate organic fertilizer, and the second mixture returns to the hydrolysis and grit removal system (100) for grit removal and then returns to the fermentation system (200) for continued fermentation.

2. The high temperature anaerobic fermentation system of straw and excrement according to claim 1, characterized in that: The hydrolysis and desander system (100) comprises a straw crushing device (2), a hydrolysis tank (3), a grit tank (7), a homogenization tank (9), and a grit tank (11); the straw crushing device (2) and the homogenization tank (9) are connected to the hydrolysis tank (3); the hydrolysis tank (3) is connected to the grit tank (7); and the hydrolysis tank (3) is connected to the grit tank (7) and the grit tank (11) in sequence.

3. The high temperature anaerobic fermentation system of straw and excrement according to claim 2, characterized in that: The fermentation system (200) comprises a high-temperature anaerobic fermentation tank (4), and the high-temperature anaerobic fermentation tank (4) is connected to a hydrolysis tank (3) and a grit tank (11) respectively.

4. The high temperature anaerobic fermentation system of straw and excrement according to claim 3, characterized in that: The separation system (300) comprises a discharge tank (5), a deliquation machine (6), and a biogas slurry temporary storage tank (13); the discharge tank (5) is connected to a grit settling tank (11); and the discharge tank (5) is respectively connected to the deliquation machine (6) and the biogas slurry temporary storage tank (13).

5. The high temperature anaerobic fermentation system of straw and excrement according to claim 4, characterized in that: The biogas slurry temporary storage tank (13) is also connected to the hydrolysis tank (3).

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