CN105820943A - Multistage gas-liquid combined stirring Venturi tube-CSTR reactor - Google Patents

Abstract

The invention discloses a multi-stage gas-liquid combined stirring Venturi tube-CSTR reaction device, which comprises a continuous stirring fully mixed anaerobic reactor, a Venturi tube, and a multi-stage external circulation pipeline. The present invention utilizes the Venturi tube to achieve the effect of gas-liquid combined stirring, sucks out the fermentation liquid with a pump, and then injects it through the Venturi tube, and the biogas forms a stirring effect at the upper part of the injection position, and can prevent the upper layer of the fermentation liquid from The effect of crusting, the liquid forms agitation at the lower part of the injection position, and the fermentation raw materials can be stirred in different forms and in different degrees according to the different conditions of the fermentation process, which shortens the hydraulic retention time and greatly improves the processing efficiency of the reactor. , On the other hand, the device is equipped with automatic control equipment and transmission to realize timing automatic feeding and automatic stirring, and can carry out different forms and different degrees of stirring on the fermentation raw materials according to different conditions of the fermentation process.

Description

A multi-stage gas-liquid combined stirring Venturi tube-CSTR reaction device

technical field

The invention relates to a multi-stage gas-liquid combined stirring system based on a venturi tube and a CSTR full-mix anaerobic reaction device, belonging to the technical field of biogas fermentation equipment.

Background technique

Biogas fermentation is an effective way to treat organic waste and realize resource utilization of waste. Through the biogas fermentation process, organic matter can be decomposed by microorganisms to produce clean energy biogas and realize the resource utilization of organic waste. Biogas fermentation has become an important link in the development model of agricultural circular economy. In the process of anaerobic digestion, the application of mixing and stirring technology can effectively solve the problems of mass transfer difficulties and uneven physical, chemical and biological properties caused by the inability of microorganisms and degradable organic matter to actually contact, thereby improving the performance of the reactor And increase the gas production rate of anaerobic digestion.

The current stirring methods in the biogas fermentation process include manual stirring, mechanical stirring, gas stirring, liquid stirring, etc., but there are certain problems in these stirring methods: 1) Manual stirring: it is mostly used in laboratories, and the volume of the fermentation device is small. The purpose of stirring and mixing the fermentation liquid is achieved by shaking the fermentation bottle regularly. However, for straw-based raw materials and high-concentration fermentation, manual stirring cannot achieve the purpose of mixing, and at the same time, the scum on the fermentation surface hardens, hindering the collection of biogas; 2) Mechanical stirring: Mechanical stirring is a mechanical device that uses various installation forms. A stirring method in which various forms of mechanical movement make materials reach a mixed state. This kind of stirring method can produce a strong shearing effect, and can use the rotation of the stirring blade to break up the digested raw materials, which is beneficial to the mixing of high-viscosity materials, and is mainly used in laboratory fermentation devices and biogas projects. However, due to the long fermentation time, the stirring device needs to run for a long time, especially in biogas projects, the mechanical stirring device is soaked in the fermentation liquid for a long time, which is easy to cause corrosion of the device. After corrosion, the stirring device needs to be replaced. , it is necessary to open the fermentation device. At this time, it is easy to cause air leakage in the fermentation tank, which affects the normal operation of biogas fermentation. At the same time, this method consumes a lot of energy, costs high, and is complicated to operate and is not conducive to gas production; 3) Liquid stirring: liquid stirring is general The liquid flow generated by the pump operation is used to complete the stirring of the materials, and the fermentation liquid itself is used to extract the fermentation liquid through the pump, and then through its impact, the crust on the surface of the fermentation liquid is broken, and the fermentation liquid is stirred. It is a low energy consumption. , easy to operate, and a stirring method that ensures the tightness of the tank, but liquid stirring will cause an increase in pressure or local pressure in the fermenter, which is not conducive to fermentation; 4) Gas stirring: Gas stirring is achieved by the movement of air bubbles in the material. The purpose of material agitation, in biogas fermentation, gas agitation mainly refers to the biogas circulation agitation, the biogas enters the biogas fermentation tank through various distributors after being compressed and pressurized, and the raw materials in the tank are circulated under the promotion of biogas. The airtightness requirements of the air-tightness are very high, and it is difficult to be used in engineering.

Contents of the invention

The present invention mainly aims at the above problems, and provides an anaerobic reaction device with less equipment in the tank, simple structure, convenient construction and maintenance, good stirring effect, high efficiency and low operation equipment cost.

In order to achieve the above object, the present invention adopts the following technical scheme: a multi-stage gas-liquid combined stirring venturi tube - CSTR reaction device, which is installed outside the fully mixed anaerobic reactor (5) containing a venturi tube (1) The multi-stage external circulation pipeline (2), during the fermentation process, the fermentation broth can be transferred from A _x (where x=1, 2, 3···N, N by the stirring stage of the reactor through the circulation pump (6) (determined by the number) sucked out, through the Venturi tube (1) and the external circulation pipeline (2), and then injected from B _x , the biogas forms agitation at the upper part of the injection position, and can prevent the upper layer of the fermentation broth from crusting As a result, the liquid forms a stirring effect at the lower part of the injection position, and the bottom level of the biogas slurry outlet should be higher than the activated sludge layer. On the other hand, it is equipped with automatic control equipment and transmission to realize automatic feeding and stirring at regular intervals. , and according to the different conditions of the fermentation process, the fermentation raw materials can be stirred in different forms and in different degrees.

The multi-stage gas-liquid combined stirring Venturi tube - CSTR reaction device is further equipped with a circulating pump (6) installed at the bottom of the water outlet, and the biogas slurry can flow to the pump by itself due to gravity, which is enough for the pump. The biogas slurry can make the pump work better, and it is convenient for installation and maintenance.

The multi-stage gas-liquid combined stirring Venturi tube - CSTR reaction device is further equipped with a circulating pump (6) installed at the bottom of the water outlet, and the biogas slurry can flow to the pump by itself due to gravity, which is enough for the pump. The biogas slurry can make the pump work better, and it is convenient for installation and maintenance.

The multi-stage gas-liquid combined stirring Venturi tube - CSTR reaction device further adds a biogas switch at the inlet section of the Venturi tube (1), which can effectively control the intake of biogas, thereby controlling gas stirring Degree.

In the multi-stage gas-liquid combined stirring Venturi tube-CSTR reaction device, the diameter of the pipeline from the biogas slurry outlet end of the external circulation pipeline (2) to the Venturi tube (1) should be larger than the pipeline diameter of the biogas slurry inlet end, Not only can the Venturi tube have enough pressure, but also can ensure that the jet of biogas slurry enters the reactor.

The multi-stage gas-liquid combined stirring Venturi tube-CSTR reaction device is further equipped with a hydraulic injector at the injection port of the biogas slurry to enhance the stirring effect.

The multi-stage gas-liquid combined stirring Venturi tube-CSTR reaction device is further equipped with automatic control equipment and a transmission to realize automatic feeding and automatic stirring at regular intervals, and different fermentation raw materials can be processed according to different conditions of the fermentation process. forms, varying degrees of agitation.

The beneficial effects produced by the present invention are as follows: multi-stage gas-liquid combined stirring is realized, and the fermentation raw materials can be stirred in different forms and in different degrees according to different conditions of the fermentation process, which solves the phenomenon of crusting on the liquid surface and ensures complete fermentation , Uniform gas production, thereby improving gas production efficiency, providing an anaerobic reaction device with less equipment in the tank, simple structure, easy construction and maintenance, good stirring effect, high efficiency, and low operating equipment costs.

Description of drawings:

Fig. 1 is a schematic diagram of the structure of the present invention.

Fig. 2 is a schematic diagram of the structure of the present invention.

Symbol Description:

1. Venturi tube, 2. Multi-stage external circulation pipeline, 3. Gas outlet, 4. Water seal outlet, 5. CSTR reactor, 6. Biogas slurry circulation pump, 7. Feed inlet, 8. Sewage discharge 9. Fermentation liquid import, 10. Biogas import, 11. Fermentation liquid export, Ax is the switch of fermentation liquid export, Bx is the switch of fermentation liquid import.

detailed description:

Below in conjunction with accompanying drawing and example the present invention will be further described:

As shown in Figure 1, a multi-stage gas-liquid combined stirring Venturi tube-CSTR reaction device, a multi-stage external circulation pipeline 2 containing a Venturi tube 1 is installed outside the continuous stirring fully mixed anaerobic reactor 5. During the fermentation process, the fermentation broth can be sucked out from A _x (where x=1, 2, 3···N, N is determined by the stirring stages of the reactor) through the circulation pump 6, through the Venturi tube 1 and the external circulation Pipeline 2, and then injected from B _x , the biogas forms agitation at the upper part of the injection position, and can prevent the upper layer of the fermentation liquid from crusting, and the liquid forms agitation at the lower part of the injection position, in which the biogas slurry exits The bottom level of the tank should be higher than the activated sludge layer. On the other hand, it is equipped with automatic control equipment and transmission to realize automatic feeding and stirring at regular intervals, and the fermentation raw materials can be processed in different forms and in different ways according to different conditions of the fermentation process. degree of stirring.

Preferably, the circulation pump 6 is installed at the bottom stage of the water outlet, and the biogas slurry can flow to the pump by itself due to gravity, so as to increase enough biogas slurry for the pump, which can make the pump work better, and is convenient for installation and maintenance.

Preferably, a Venturi tube 1 is installed on the external circulation pipeline 2, and the inlet 10 of the Venturi tube 1 is connected to the gas cabinet, and the principle of the Venturi tube is used to achieve the effects of gas-liquid stirring and shell breaking.

Preferably, a biogas switch is added to the inlet section of the Venturi tube 1, which can effectively control the intake amount of the biogas, thereby controlling the degree of gas stirring.

Preferably, the diameter of the pipeline from the biogas slurry outlet end of the external circulation pipeline 2 to the Venturi tube 1 should be larger than the pipeline diameter of the biogas slurry inlet end, not only to ensure that the venturi tube has sufficient pressure, but also to ensure that the biogas slurry jet flows into the reactor .

Preferably, a hydro jet is installed at the biogas slurry injection port to enhance the stirring effect.

Preferably, the multi-stage gas-liquid combined stirring Venturi tube-CSTR reaction device is equipped with automatic control equipment and a transmission to realize automatic feeding and stirring at regular intervals, and different forms, varying degrees of agitation.

The invention realizes multi-stage gas-liquid combined stirring, and can carry out different forms and different degrees of stirring on the fermentation raw materials according to different conditions of the fermentation process, solves the phenomenon of crusting on the liquid surface, ensures complete fermentation and uniform gas production, and thus The gas production efficiency is improved, and an anaerobic reaction device with less equipment in the tank, simple structure, convenient construction and maintenance, good stirring effect, high efficiency and low operation equipment cost is provided.

The present invention has been described above by way of examples, but the present invention is not limited to the above-mentioned specific embodiments, and any changes or variations made based on the present invention fall within the scope of protection of the present invention.

Claims (8)

1. A multi-stage gas-liquid combined stirring Venturi tube-CSTR reaction device is characterized in that: a multi-stage external circulation tube containing a Venturi tube (1) is installed outside the continuous stirring fully mixed anaerobic reactor (5) Road (2), during the fermentation process, the fermentation broth can be sucked out from A _x (where x=1, 2, 3···N, N is determined by the stirring stages of the reactor) through the circulation pump (6), Through the Venturi tube (1) and the external circulation pipeline (2), and then injected from B _x , the biogas forms agitation at the upper part of the injection position, and can achieve the effect of preventing the upper layer of the fermentation broth from crusting, and the liquid is injected The lower part of the position forms the stirring effect, and the bottom level of the biogas slurry outlet should be higher than the activated sludge layer. On the other hand, the device is equipped with automatic control equipment and transmission to realize automatic feeding and stirring at regular intervals, and can be based on fermentation According to the different conditions of the process, the fermentation raw materials are stirred in different forms and in different degrees. 2. The multi-stage gas-liquid combined stirring venturi tube-CSTR reaction device according to claim 1, characterized in that: a multi-stage external circulation pipeline (2) is installed on the side of the CSTR reactor (5), and the They are connected with each other, only need to control the number of stages of circulation through a switch, and realize multi-stage circulation through a circulation pump (6), so as to achieve the purpose of low energy consumption and low cost. 3. The multi-stage gas-liquid combined stirring Venturi tube-CSTR reaction device according to claim 1 or 2, characterized in that: the circulating pump (6) is installed at the bottom stage of the water outlet, and the biogas slurry due to gravity, It can flow to the pump by itself, provide enough biogas slurry for the pump, make the pump work better, and facilitate installation and maintenance. 4. The multi-stage gas-liquid combined stirring Venturi tube-CSTR reaction device according to claim 1 or 2, characterized in that: a Venturi tube (1) is installed on the external circulation pipeline (2), and the Venturi tube (1 ) The air inlet is connected to the gas cabinet, and the principle of the Venturi tube is used to achieve the effect of gas-liquid stirring and shell breaking. 5. The multi-stage gas-liquid combined stirring Venturi tube-CSTR reaction device according to claim 4, characterized in that: a biogas switch is added at the inlet end of the Venturi tube (1), which can effectively control the flow of biogas The amount of air intake, thereby controlling the degree of gas stirring. 6. The multi-stage gas-liquid combined stirring venturi tube-CSTR reaction device according to claim 1 or 2, characterized in that: the pipeline from the biogas slurry outlet end of the external circulation pipeline (2) to the venturi tube (1) The diameter should be larger than the diameter of the pipeline at the biogas slurry inlet, not only to ensure sufficient pressure in the Venturi tube, but also to ensure that the biogas slurry jet flows into the reactor. 7. The multi-stage gas-liquid combined stirring Venturi tube-CSTR reaction device according to claim 6, characterized in that: a hydraulic injector is installed at the inlet end of the biogas slurry to enhance the stirring effect. 8. The multi-stage gas-liquid combined stirring Venturi tube-CSTR reaction device according to claim 1 is characterized in that: the device is equipped with automatic control equipment and a speed changer to realize automatic feeding and automatic stirring at regular intervals, and can be based on fermentation According to the different conditions of the process, the fermentation raw materials are stirred in different forms and in different degrees.