Internal spraying closed circulating type gas fermentation reactor

Abstract

The utility model discloses an internal spraying closed circulating type gas fermentation reactor. The reactor comprises a fermentation reaction cavity, a gas distributor, three groups of gas supply components, a safety valve and a spraying device, wherein fermentation liquid is contained in the fermentation reaction cavity; the three groups of gas supply components are used for communicating the gas distributor with a corresponding gas source; the safety valve is fixedly arranged at the top of the fermentation reaction cavity; the circulating pump is located at the position of the corresponding side of the fermentation reaction cavity, the liquid pumping pipe is used for communicating the circulating pump with the fermentation reaction cavity, and the liquid conveying pipe is used for communicating the circulating pump with the spraying device. According to the utility model, the problem that microbial cells are damaged when stirring fan blades are adopted for mechanical stirring traditionally is solved, meanwhile, an inner spraying closed circulating type gas fermentation system is also established, liquid circulating fermentation is realized, no tail gas is discharged in the whole fermentation process, and the utilization rate of gas is close to 100%.

Description

Technical Field

[0001] The utility model relates to the technical field of gas fermentation, in particular to an internal spraying closed-circuit gas fermentation reactor. Background Art

[0002] Different from the traditional fermentation method using solid medium or liquid medium (such as sugar oil) as carbon source and energy source, gas fermentation refers to a fermentation method in which both carbon source / energy source are provided to microorganisms in the form of gas to achieve the comprehensive biological utilization and conversion of gases such as CO2. Under the background of carbon emission control, gas fermentation technology provides support for the treatment of greenhouse gases in the production of industries such as coal chemical industry, iron and steel industry, and coal-fired power plants.

[0003] Referring to the utility model patent of fermentation reactor with application number 202320327995.7, it can be known that this patent sets a mixer, and through the stirring of the mixer, the gas and biological bacteria are mixed more fully. However, when the above-mentioned patent is actually applied, there is a problem of damage to microbial cells when mechanical stirring is carried out by using stirring fan blades, and furthermore, the fermentation waste gas is discharged through the waste gas outlet, resulting in low gas utilization rate. Summary of the Utility Model

[0004] In view of the above-mentioned disadvantages of the prior art, the purpose of the present utility model is to provide an internal spraying closed-circuit gas fermentation reactor to overcome the problem of damage to microbial cells existing in traditional mechanical stirring using stirring fan blades, and to establish an internal spraying closed-circuit gas fermentation system to realize liquid circulation fermentation.

[0005] An internal spraying closed-circuit gas fermentation reactor includes a fermentation reaction cavity filled with fermentation liquid; the reactor further includes:

[0006] A gas distributor, which is fixedly installed in the fermentation reaction cavity;

[0007] A spraying device, which is fixedly installed in the fermentation reaction cavity;

[0008] A circulation pump, which is located at a corresponding position on the opposite side of the fermentation reaction cavity;

[0009] A liquid extraction pipe for connecting the circulation pump and the fermentation reaction cavity; and

[0010] A liquid infusion pipe for connecting the circulation pump and the spraying device.

[0011] In one embodiment, the gas distributor is located near the bottom of the cavity, and the gas distributor adopts a loop type, bubbling type or jet type structure.

[0012] In one embodiment, the type of the gas source is one, and the number of the gas supply assemblies is one group; or, the types of the gas sources are multiple, and the number of the gas supply assemblies is the same as the number of the types of the gas sources.

[0013] Further, the gas supply assembly includes a filter, an inlet pipe I fixedly connected to the air inlet of the filter, an inlet pipe II fixedly connected between the filter and the gas distributor, a switch valve and a regulating valve installed on the inlet pipe II.

[0014] Still further, the filter is located at the corresponding other side position of the fermentation reaction cavity, and the filter is filled with a filter element.

[0015] Even further, the inlet pipe II is fixedly arranged through a side wall of the fermentation reaction cavity; the switch valve and the regulating valve are located outside the fermentation reaction cavity, and the switch valve is arranged close to the filter.

[0016] In one embodiment, the reactor further includes a safety valve fixedly installed at the top of the fermentation reaction cavity.

[0017] Further, the spraying device is arranged close to the top of the cavity, and the spraying device adopts a spraying ball or a porous tube distributor.

[0018] In one embodiment, the circulation pump is located outside the fermentation reaction cavity, and the circulation pump adopts a centrifugal pump or a rotary pump. The liquid inlet end of the liquid extraction pipe is fixedly connected through the bottom of the fermentation reaction cavity.

[0019] Further, the liquid outlet end of the liquid delivery pipe passes through the top of the fermentation reaction cavity and is fixedly installed at the liquid inlet of the spraying device.

[0020] Compared with the prior art, the beneficial effects of the present utility model are as follows: the problem of damage to microbial cells caused by mechanical stirring using a stirring fan blade in the traditional technology is overcome. At the same time, an internal spraying closed-loop gas fermentation system is established to realize liquid circulation fermentation. No tail gas is emitted during the whole fermentation process, and the utilization rate of the gas can reach nearly 100%. Description of the Drawings

[0021] Figure 1 The figure shows a structural schematic diagram of an internal spraying closed-loop gas fermentation reactor provided by the present utility model.

[0022] Description of the Main Component Symbols

[0023] 1. Fermentation reaction cavity; 2. Gas distributor; 3. Filter; 4. Inlet pipe I; 5. Inlet pipe II; 6. Switch valve; 7. Regulating valve; 8. Safety valve; 9. Circulation pump; 10. Liquid extraction pipe; 11. Liquid delivery pipe; 12. Spraying device.

[0024] The above descriptions of the main component symbols will further elaborate on the present utility model in conjunction with the accompanying drawings and specific embodiments. Specific Embodiments

[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0026] Please refer to Figure 1 , this embodiment provides an internal spray closed-loop gas fermentation reactor, which includes a fermentation reaction cavity 1 filled with fermentation broth, a gas distributor 2 fixedly installed in the fermentation reaction cavity 1, three gas supply assemblies for connecting the gas distributor 2 and the corresponding gas sources, a safety valve 8 fixedly installed at the top of the fermentation reaction cavity 1, a spray device 12 fixedly installed in the fermentation reaction cavity 1 and arranged near the cavity top, a circulation pump 9 located at a corresponding side position of the fermentation reaction cavity 1, a liquid extraction pipe 10 for connecting the circulation pump 9 and the fermentation reaction cavity 1, and an infusion pipe 11 for connecting the circulation pump 9 and the spray device 12.

[0027] In this embodiment, microbial strains are introduced into the liquid medium. After a period of cultivation, the liquid produced by the microorganisms metabolizing the nutrients in the medium is called fermentation broth. The fermentation broth is rich in microorganisms that dominate the gas fermentation reaction. Through microbial fermentation, the purpose of fixing and utilizing CO2 is achieved, thereby providing support for the treatment of greenhouse gases. Under the background of controlling carbon emissions, it is conducive to popularization and use in industries such as coal chemical industry, iron and steel industry, and coal-fired power plants. It should be noted that the fermentation reaction cavity 1 of this embodiment is also provided with accessories such as temperature transmitters, internal and external coil pipes, feed ports, sampling ports, and sight glasses that should be available in a conventional fermentation system. The drawings of the foregoing accessories are not shown and will not be elaborated further.

[0028] The gas distributor 2 is located at a position close to the bottom of the cavity, and the gas distributor 2 adopts a jet structure. In this embodiment, the gas distributor 2 is provided to drive the fermentation broth to play a stirring role. When the reaction gas is introduced into the fermentation broth through the gas distributor 2, a large number of tiny bubbles are introduced, thereby increasing the gas-liquid contact area. At the same time, the gas flow rate through the gas distributor 2 is increased, driving the surrounding fermentation broth to move to generate a stirring effect, and carrying the liquid to gradually rise and move, so that the gas and microorganisms are fully mixed, improving the conversion rate of microbial fermentation to treat gas, and overcoming the problem of damage to microbial cells existing when using a stirring fan blade for mechanical stirring in the traditional method.

[0029] The three gas supply components are used to respectively feed CO2, H2 and CO into the fermentation reaction chamber 1. This embodiment uses CO2, H2 and CO as gas sources as an example to illustrate the microbial fermentation reaction: CO2 is used as a carbon source, and the microorganisms convert it into cell substances to participate in the fermentation process. H2 and CO are used as energy sources, and the microorganisms use H2 to reduce CO2 to organic matter, and CO is converted into useful chemicals such as butene through microbial fermentation.

[0030] The air supply assembly includes a filter 3, an air intake pipe I4 fixedly connected to the air inlet of the filter 3, an air intake pipe II5 fixedly connected between the filter 3 and the gas distributor 2, and a switch valve 6 and a regulating valve 7 installed on the air intake pipe II5. The filter 3 is located at the other side of the fermentation reaction chamber 1, and a filter element is filled in the filter 3. In this embodiment, in order to ensure the sterility of the gas entering the fermentation reaction chamber 1, the gas is filtered by the filter 3 while being input to remove impurities such as microorganisms, moisture and dust carried in the gas.

[0031] The air inlet pipe II5 is fixedly arranged through one side wall of the fermentation reaction chamber 1, the switch valve 6 and the regulating valve 7 are located outside the fermentation reaction chamber 1, and the switch valve 6 is arranged near the filter 3. In this embodiment, during the fermentation process, the switch valve 6 remains normally open, and the regulating valve 7 is set to the pressure required by the process. As the gas in the fermentation reaction chamber 1 is gradually consumed, the system pressure decreases, and the regulating valve 7 automatically opens to replenish fresh gas after reaching the set pressure. The switch valve 6 is controlled by a gas online monitoring control switch (not shown) arranged at the top of the fermentation reaction chamber 1, thereby ensuring that the required gas is replenished to the system at any time.

[0032] In this embodiment, the safety valve 8 is in a normally closed state. When the medium pressure in the reactor rises to exceed a threshold value, the safety valve 8 opens to discharge gas to achieve the purpose of pressure relief. It should be noted that in order to prevent the safety valve 8 from directly contacting the fermentation liquid, a bursting disc with a smooth arc surface (not shown) is installed at the position where the safety valve 8 contacts the fermentation liquid, thereby improving the reliability of the safety valve 8.

[0033] The circulation pump 9 is located outside the fermentation reaction chamber 1, and the circulation pump 9 adopts a centrifugal pump, and the liquid inlet end of the liquid pumping pipe 10 is fixedly connected to the bottom of the fermentation reaction chamber 1. In this embodiment, the circulation pump 9 is provided to effectively pressurize the fermentation liquid and pump it into the fermentation reaction chamber 1 through the spray device 12 to continue to participate in the microbial fermentation reaction. This embodiment uses a centrifugal pump as the circulation pump 9 and a porous tubular distributor as the spray device 12. The porous tubular distributor is used to reduce dead angles, prevent the fermentation liquid from adhering to the wall when falling, and reduce the risk of contamination.

[0034] The liquid outlet end of the infusion tube 11 passes through the top of the fermentation reaction cavity 1 and is fixedly installed at the liquid inlet of the spraying device 12. In this embodiment, after the circulating pump 9 extracts the fermentation broth in the fermentation reaction cavity 1 and pressurizes it, it is pumped into the spraying device 12 along the infusion tube 11 and finally returns to the fermentation reaction cavity 1 to continue to participate in the microbial fermentation reaction. Through liquid circulation fermentation, the utilization rate of gas approaches 100%.

[0035] The reactor of this embodiment has established an internal spraying closed-loop gas fermentation system, and the specific working process is as follows:

[0036] The gas supply component sends gas into the fermentation reaction cavity 1, and the gas and the fermentation broth are mixed and react under the action of microorganisms to be converted into useful chemical substances;

[0037] Start the circulating pump 9. After the circulating pump 9 extracts the fermentation broth in the fermentation reaction cavity 1 and pressurizes it, it is pumped into the spraying device 12 along the infusion tube 11 and finally returns to the fermentation reaction cavity 1 to continue to participate in the microbial fermentation reaction, thereby realizing liquid circulation fermentation.

[0038] In summary, the reactor of this embodiment has the following advantages: A gas distributor 2 is provided to drive the fermentation broth to play a stirring role, overcoming the problem of damage to microbial cells existing in traditional mechanical stirring using stirring fan blades. At the same time, an internal spraying closed-loop gas fermentation system is established to realize liquid circulation fermentation. No tail gas is emitted during the entire fermentation process, and the utilization rate of gas can approach 100%.

[0039] The above embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the utility model patent shall be subject to the appended claims.

Claims

1. An internal spraying closed circulation gas fermentation reactor, comprising a fermentation reaction chamber (1) containing a fermentation liquid; It is characterized in that The reactor further comprises: A gas distributor (2) fixedly installed in the fermentation reaction chamber (1); A spray device (12), which is fixedly installed in the fermentation reaction chamber (1); A circulation pump (9), which is located at a position on a corresponding side of the fermentation reaction chamber (1); a liquid extraction pipe (10) for connecting the circulation pump (9) and the fermentation reaction chamber (1); and A liquid infusion tube (11) for connecting the circulation pump (9) and the spray device (12).

2. The internal spraying closed circulation gas fermentation reactor according to claim 1, characterized in that: The gas distributor (2) is located near the bottom of the cavity, and the gas distributor (2) adopts a circulation type, bubbling type or jet type structure.

3. The internal spraying closed cycle gas fermentation reactor according to claim 1, characterized in that: The type of gas source is one, and the number of gas supply components is one group; Alternatively, there are multiple types of gas sources, and the number of gas supply components is consistent with the number of gas source types.

4. The internal spraying closed circulation gas fermentation reactor according to claim 3, characterized in that: The gas supply assembly comprises a filter (3), an air intake pipe I (4) fixedly connected to the air intake port of the filter (3), an air intake pipe II (5) fixedly connected between the filter (3) and the gas distributor (2), and a switch valve (6) and a regulating valve (7) mounted on the air intake pipe II (5).

5. The internal spraying closed circulation gas fermentation reactor according to claim 4, characterized in that: The filter (3) is located at a position corresponding to the other side of the fermentation reaction chamber (1), and a filter element is filled in the filter (3).

6. The internal spraying closed cycle gas fermentation reactor according to claim 5, characterized in that: The air inlet pipe II (5) is fixedly arranged through a side wall of the fermentation reaction chamber (1); The switch valve (6) and the regulating valve (7) are located outside the fermentation reaction chamber (1), and the switch valve (6) is arranged close to the filter (3).

7. The internal spraying closed cycle gas fermentation reactor according to claim 1, characterized in that: The reactor further comprises a safety valve (8) fixedly mounted on the top of the fermentation reaction chamber (1).

8. The internal spraying closed circulation gas fermentation reactor according to claim 7, characterized in that: The spray device (12) is arranged close to the cavity top, and the spray device (12) adopts a spray ball or a porous tube distributor.

9. The internal spraying closed cycle gas fermentation reactor according to claim 1, characterized in that: The circulation pump (9) is located outside the fermentation reaction chamber (1), and the circulation pump (9) is a centrifugal pump or a rotor pump. The liquid inlet end of the liquid extraction pipe (10) is fixedly connected to the bottom of the fermentation reaction chamber (1).

10. The internal spraying closed circulation gas fermentation reactor according to claim 9, characterized in that: The liquid outlet end of the liquid delivery tube (11) passes through the top of the fermentation reaction chamber (1) and is fixedly mounted at the liquid inlet of the spray device (12).

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