CN109706059B - Improved aerobic fermentation tank - Google Patents
Improved aerobic fermentation tank Download PDFInfo
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- CN109706059B CN109706059B CN201811626097.1A CN201811626097A CN109706059B CN 109706059 B CN109706059 B CN 109706059B CN 201811626097 A CN201811626097 A CN 201811626097A CN 109706059 B CN109706059 B CN 109706059B
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- 238000010564 aerobic fermentation Methods 0.000 title abstract description 8
- 230000004151 fermentation Effects 0.000 claims abstract description 67
- 238000000855 fermentation Methods 0.000 claims abstract description 66
- 238000005520 cutting process Methods 0.000 claims abstract description 11
- 238000003756 stirring Methods 0.000 claims description 40
- 238000007789 sealing Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 25
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 14
- 229910052760 oxygen Inorganic materials 0.000 abstract description 14
- 239000001301 oxygen Substances 0.000 abstract description 14
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000007788 liquid Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 150000001413 amino acids Chemical class 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000006213 oxygenation reaction Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
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- Apparatus Associated With Microorganisms And Enzymes (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
Abstract
The invention provides an improved aerobic fermentation tank, which can solve the problems that the energy consumption is increased and the production cost of fermentation enterprises is greatly increased due to the fact that the prior fermentation tank adopts the increased amount of compressed air to improve the oxygen solubility of fermentation liquor. The device comprises a tank body, a stirrer, an air supply pipe and an air mixer, wherein the bottom of the tank body is provided with a mounting hole; the upper end of a connecting sleeve of the air mixer is fixedly connected with the mounting hole and sealed, an outer cylinder is communicated with the connecting sleeve, the outer cylinder is inserted into the mounting hole and positioned below the air supply pipe, and leakage holes are formed in the circumferential direction of the cylinder wall of the outer cylinder at intervals; the main shaft of the gear motor is inserted into the connecting sleeve, the upper end of the main shaft is coaxially and fixedly connected with a rotating shaft, and the lower end of the rotating shaft is rotationally connected with the connecting sleeve and sealed; the upper end of the rotating shaft stretches into the outer cylinder, the first blades are uniformly arranged at intervals along the circumference of the rotating shaft at positions corresponding to the drain holes, the first blades are of rectangular plate-shaped structures and are arranged in a downward inclined mode, and cutting gaps are reserved between the circumferential edges of the first blades and the inner wall of the outer cylinder.
Description
Technical Field
The invention relates to the field of aerobic fermentation, in particular to an improved aerobic fermentation tank.
Background
In the aerobic fermentation process, the microorganisms in the fermentation tank are oxygenated by introducing compressed air into the fermentation tank, the compressed air is sent to the bottom of the fermentation tank through an air supply pipe and uniformly distributed, then the fermentation liquid and the air are stirred by utilizing a stirrer in the tank, the mixing between the fermentation liquid and the air is promoted, the oxygen solubility of the fermentation liquid is improved, and the microorganisms are good in oxygenation effect, high in propagation speed, high in conversion rate and high in yield.
However, the stirrer is used for mixing the fermentation liquor and the air, and the mixing efficiency is low, because the air and the fermentation liquor belong to two completely different phases, the former is in a gas state, the specific gravity is light, the latter is in a liquid state, the specific gravity is more than 800 times greater than the former, the air can rapidly rise after entering the fermentation liquor, the stirrer can only cut larger bubbles to contact the fermentation liquor, the contact area of the air and the fermentation liquor is small, and meanwhile, the stay time of the air in the fermentation liquor is short, so that the dissolved oxygen of the fermentation liquor is low.
In order to improve the oxygen solubility, the method commonly adopted in the industry is to increase the consumption of compressed air, for example, when amino acids are fermented, the air supply amount of the compressed air per minute is almost equal to the volume of a fermentation tank, and for example, the volume of the fermentation tank is 200m 3, the air supply amount also needs to reach 200m 3/min, the power required by the compressed air is very large, the motor energy consumption of an air compressor is about 720KW/h according to the exhaust amount of 200m 3/min, which is equivalent to 2-3 times of the energy consumption of a stirring motor of the fermentation tank, so the energy consumption of air supply is very large. The total energy consumption of the air compressor is 21000 KW/h-43000 KW/h, the energy consumption can be 40-45% of the total energy consumption of the whole fermentation section, and the production cost of the fermentation enterprises is greatly increased.
Disclosure of Invention
Aiming at the technical problems that the prior fermentation tank adopts the increased consumption of compressed air to improve the oxygen solubility of fermentation liquor, thereby increasing energy consumption and greatly increasing the production cost of fermentation enterprises, the invention provides an improved aerobic fermentation tank which can fully and efficiently mix fermentation liquor and air, greatly reduce air supply quantity and reduce the production cost.
The technical scheme is as follows: the utility model provides an improved generation aerobiotic fermentation cylinder, its includes jar body, agitator and blast pipe, the lower extreme of blast pipe is located agitator below, its characterized in that: the air mixer is characterized by further comprising an air mixer, wherein the bottom of the tank body is provided with a mounting hole coaxial with the tank body; the air mixer comprises a speed reducing motor, a connecting sleeve and an outer cylinder which are coaxially connected from bottom to top, wherein the upper end of the connecting sleeve is fixedly connected with the mounting hole and sealed, the outer cylinder is mutually communicated with the connecting sleeve, the outer cylinder is inserted into the mounting hole and positioned below the air supply pipe, and leakage holes are formed in the circumferential direction of the cylinder wall of the outer cylinder at intervals; the main shaft of the speed reducing motor is inserted into the connecting sleeve, the upper end of the main shaft is coaxially and fixedly connected with a rotating shaft, and the lower end of the rotating shaft is rotatably connected with the connecting sleeve and sealed; the upper end of the rotating shaft stretches into the outer cylinder, blades I are uniformly arranged at intervals along the circumference of the rotating shaft at positions corresponding to the drainage holes, the blades I are of rectangular plate-shaped structures and are arranged in a downward inclined mode, and a cutting gap is reserved between the circumferential edge of each blade I and the inner wall of the outer cylinder.
It is further characterized by:
the included angle between the surface of the first blade and the axial direction of the rotating shaft is 15-35 degrees.
The cutting gap is 0.8 mm-1.2 mm.
The mounting hole is fixedly connected with a connecting flange, an upper flange is formed at the upper end of the connecting sleeve, the upper flange is fixedly connected with the connecting flange through bolts, and a sealing ring is further arranged between the upper flange and the connecting flange.
The drainage holes are kidney-shaped holes which are vertically arranged, and the drainage holes are uniformly arranged at intervals along the circumferential direction of the outer barrel.
The first vane has a height greater than or equal to the height of the drain hole.
The rotating speed of the rotating shaft is 1500 r r/min-3600 r/min.
The stirrer comprises a stirring shaft and blades, the upper end of the stirring shaft is connected with the rotation power of a stirring motor, at least two layers of blades are arranged along the axial direction of the stirring shaft, each blade comprises a central sleeve and a second blade, the central sleeves are sleeved and fixedly connected on the stirring shaft, the second blades are provided with a plurality of blades and are fixedly connected on the peripheral wall of the central sleeve at equal intervals, and the second blades are of rectangular plate-shaped structures and are arranged in a downward inclined mode.
The included angle between the plate surface of the second blade and the axial direction of the stirring shaft is 45 degrees.
The diameter of the blade is 1/5 of the diameter of the tank body, and the height of the blade II is 1/25 of the diameter of the tank body.
The beneficial effects of the invention are as follows:
According to the device, the air mixer is arranged at the bottom of the fermentation tank, the outer cylinder of the air mixer is arranged in the fermentation tank, the rotating shaft is arranged in the outer cylinder, the first blade is arranged on the rotating shaft, a cutting gap is reserved between the first blade and the outer cylinder, the speed reducing motor drives the rotating shaft to rotate at a high speed, the first blade is arranged in a downward inclined mode, so that strong suction force is generated at the center of the air mixer, compressed air and fermentation liquor are sucked into the outer cylinder, the compressed air and the fermentation liquor transversely flow out of the outer cylinder through the cutting gap and the drainage hole under the stirring of the first blade, in the process of flowing out of the outer cylinder, the air is cut into countless fine bubbles to be in contact with the fermentation liquor, the air and the fermentation liquor are fully mixed, and therefore, the dissolved oxygen of the fermentation liquor is greatly improved, and under the condition that the same dissolved oxygen is obtained, the consumption of the fermentation section can be remarkably reduced by more than 40%, the energy saving effect is very obvious, and the production cost of a fermentation enterprise can be greatly reduced.
Drawings
FIG. 1 is a front view of the present invention;
FIG. 2 is an enlarged view of area A of FIG. 1;
FIG. 3 is a top view of FIG. 1;
FIG. 4 is a front view of an air mixer;
FIG. 5 is a top view of the first vane and the outer barrel of FIG. 4;
FIG. 6 is a schematic diagram illustrating a connection relationship between a first blade and a rotating shaft;
FIG. 7 is an enlarged view of region B of FIG. 1;
fig. 8 is a cross-sectional view taken along line C-C of fig. 1.
Reference numerals: 1-a tank body; 2-an air mixer; 3-drainage holes; 4-rotating shaft; 5-blade one; 6-a stirrer; 7-an air supply pipe; 8-connecting flanges; 9-a bolt; 10-air inlet; 11-measuring a dissolved oxygen degree port; 12-material outlet; 13-material inlet; 14-an air outlet; 15-viewing mirror; 16-sealing rings; 17-a bracket; 21-a gear motor; 22-connecting sleeve; 221-upper flange; 222-a lower flange; 23-an outer cylinder; 61-a stirring shaft; 62-blades; 621-a central sleeve; 622-blade two; 63-a stirring motor; 71-air outlet holes.
Detailed Description
Referring to fig. 1 to 8, the improved aerobic fermentation tank of the invention comprises a tank body 1, a stirrer 6, an air supply pipe 7 and an air mixer 2, wherein the lower end of the air supply pipe 7 is positioned below the stirrer 6, the lower end of the air supply pipe 7 is annular and is arranged in the tank body 1 through a bracket 17, the lower end of the air supply pipe 7 is uniformly provided with air outlet holes 71 along the circumferential direction thereof, and the included angle alpha between the axial direction and the vertical direction of the air outlet holes 71 is 45 degrees, so that air entering the tank body 1 can be uniformly distributed; the bottom of the tank body 1 is provided with a mounting hole coaxial with the tank body; the air mixer 2 comprises a gear motor 21, a connecting sleeve 22 and an outer cylinder 23 which are coaxially connected from bottom to top, wherein the upper end of the connecting sleeve 22 is fixedly connected with a mounting hole and sealed, the outer cylinder 23 is communicated with the connecting sleeve 22, the outer cylinder 23 is inserted into the mounting hole and positioned below the air supply pipe 7, and leakage holes 3 are formed in the circumferential direction of the cylinder wall of the outer cylinder 23 at intervals; the main shaft of the gear motor 21 is inserted into the connecting sleeve 22, the upper end of the main shaft is coaxially and fixedly connected with the rotating shaft 4, the lower end of the rotating shaft 4 is rotationally connected with the connecting sleeve 22 through a bearing and is sealed through a mechanical seal, and the mechanical seal is in the prior art; the upper end of the rotating shaft 4 stretches into the outer cylinder 23, the first blades 5 are uniformly arranged at intervals along the circumferential direction of the rotating shaft 4 at positions corresponding to the drain holes 3, the first blades 5 are of rectangular plate-shaped structures and are arranged in a downward inclined mode, compared with the first blades which are arranged vertically, the suction force generated by the air mixer is larger, air and fermentation liquor are more favorably sucked into the outer cylinder to be stirred and cut, and preferably, the included angle beta between the plate surface of the first blades 5 and the axial direction of the rotating shaft 4 is 15-35 degrees; a cutting gap d is reserved between the circumferential edge of the first blade 5 and the inner wall of the outer cylinder 23, and the cutting gap d is 0.8 mm-1.2 mm.
In fig. 1, 10 is an air inlet, 11 is a dissolved oxygen measuring port, 12 is a material outlet, 13 is a material inlet, 14 is an air outlet, and 15 is a sight glass.
Referring to fig. 1 and 2, a connecting flange 8 is fixedly connected to the mounting hole, an upper flange 221 is formed at the upper end of the connecting sleeve 22, the upper flange 221 is fixedly connected with the connecting flange 8 through bolts 9, a sealing ring 16 is further mounted between the upper flange 221 and the connecting flange 8, a lower flange 222 is formed at the lower end of the connecting sleeve 22, and the lower flange 222 is fixedly connected with the housing of the gear motor 21 through bolts. So designed, the installation is convenient, and the structure is simple and reliable.
Referring to fig. 4, the drain holes 3 are kidney-shaped holes vertically arranged, and the drain holes 3 are uniformly spaced along the circumferential direction of the outer cylinder 23; the height of the first vane 5 is greater than or equal to the height of the drain hole 3. By the design, the air cutting and the mixing between the air and the fermentation broth are facilitated, and the oxygen solubility of the fermentation broth is improved.
Preferably, the rotating speed of the rotating shaft 4 is 1500 r-3600 r/min, and the design can enable the air mixer to generate strong suction force to suck fermentation liquor and air into the air mixer, so that mixing of the fermentation liquor and the air is promoted.
The conventional fermentation tank comprises a stirring shaft and paddles arranged on the stirring shaft, wherein the stirring shaft is driven by a stirring motor, the paddles are provided with multiple layers along the axial direction of the stirring shaft, and in order to enhance the stirring effect, the inclination directions of two adjacent layers of paddles of the conventional fermentation tank are opposite, namely, when stirring, one layer of paddles downwards presses fermentation liquor, and the other layer of paddles upwards turns the fermentation liquor, so that the fermentation liquor realizes mixed flows in different directions. However, the stirrer with the structure has great reaction force of fermentation liquor to the blades, so that the required stirring motor has high power and high energy consumption. In order to further reduce the energy consumption, the structure of the stirrer is redesigned by the fermentation tank disclosed by the invention, and as shown in fig. 7, the stirrer 6 comprises a stirring shaft 61 and a blade 62, the upper end of the stirring shaft 61 is in rotary power connection with a stirring motor 63, at least two layers of blades 62 are arranged along the axial direction of the stirring shaft 61, the blade 62 comprises a central sleeve 621 and a blade II 622, the central sleeve 621 is sleeved and fixedly connected on the stirring shaft 61, the blade II 622 is provided with a plurality of blades which are uniformly and fixedly connected on the peripheral wall of the central sleeve 621 at intervals, the blade II 622 is of a rectangular plate-shaped structure and is obliquely arranged downwards, and an included angle theta between the plate surface of the blade II 622 and the axial direction of the stirring shaft 61 is 45 degrees; the diameter of the blade 62 is 1/5 of the diameter of the tank 1, and the height of the blade two 622 is 1/25 of the diameter of the tank 1. Because the air mixer is arranged at the bottom of the tank body, the air mixer can be used for fully mixing air and fermentation liquor and improving the oxygen solubility, so that the stirring requirement of the stirrer is reduced, the stirrer only needs to convey the fermentation liquor at the center of the tank body from top to bottom and the fermentation liquor at the bottom of the tank body rises along the inner wall of the tank body, and the second blades on the stirrer are obliquely arranged downwards, so that the reaction force of the fermentation liquor to the blades is greatly reduced, and the power of a stirring motor is reduced; meanwhile, the air mixer also has the function of sucking fermentation liquor downwards, so the conveying function of the mixer can be further weakened, the diameter of the blade is only 1/5 of the diameter of the tank body, the height of the blade II is only 1/25 of the diameter of the tank body, compared with the traditional blade, the diameter and the height of the blade used by the invention are reduced by about 20 percent compared with those of the conventional blade, the power of the stirring motor can be further reduced, and experiments prove that the power of the stirring motor of the invention can be reduced by more than 40 percent compared with that of the stirring motor of the conventional fermentation tank, and meanwhile, the good circulation of fermentation liquor in the tank can be ensured.
The device is adopted for fermentation, and has the following two advantages:
1. The fermentation yield can be greatly improved. The device can improve the oxygen solubility of the fermentation liquid, and for most amino acid products, the conversion rate of the fermentation process can be improved along with the improvement of the oxygen solubility, which means the shortening of the time required by the fermentation process, namely the improvement of the production efficiency, and the economic benefit generated in the aspect is huge and cannot be measured.
2. The energy consumption of the fermentation section can be greatly reduced. According to the calculation of obtaining the same dissolved oxygen, after the device is adopted, the air supply quantity of compressed air can be reduced by more than 40% compared with the air supply quantity required by the prior art, namely, the power of an air compressor can be reduced by more than 40%, because the energy consumption of a motor of the air mixer needs to be increased after the air mixer is increased, the energy consumption of a speed reduction motor arranged on the air mixer is about 0.2-0.25 times of the energy consumption of the air compressor, the calculation is carried out according to the air displacement of 200m 3/min, the energy consumption of the motor of the air compressor required by the prior art is 720KW/h, after the device is adopted, the power of the air compressor can be reduced by 720KW/h multiplied by 0.4=288 KW/h, and the energy consumption of the speed reduction motor of the air mixer is 720KW/h multiplied by 0.225 (average value) =162 KW/h; in addition, because the power of the stirring motor is also reduced, the energy consumption of the conventional stirring motor is about 0.2-0.3 times of the energy consumption of the air compressor, and calculated as the minimum 0.2 times, the energy consumption of the conventional stirring motor is 720KW/h multiplied by 0.2=144 KW/h, so that the energy consumption of the stirring motor of the device can be saved to 144KW/h multiplied by 0.4 approximately 58KW/h, and compared with the prior art, the device has the practically reducible energy consumption of 288KW/h-162KW/h+58KW/h approximately 184KW/h, namely, the energy consumption is reduced by more than 26% (184/720×100%).
3. The energy-saving benefit is obvious. The total gas consumption of a medium-large enterprise is calculated by 5000m 3, the motor energy consumption of the air compressor required by the prior art is 18000 KW/h, the energy consumption can be reduced by 26% after the device is used, the energy consumption can be saved by 4680 KW/h, the electricity consumption can be saved by more than 2500 ten thousand degrees each year, the electricity cost is saved by more than 1000 ten thousand yuan, the standard coal can be further saved by at least 8000 tons, the carbon emission is reduced by at least 2.5 ten thousand tons, and the energy saving and emission reduction effects are very remarkable.
Claims (1)
1. The utility model provides an improved generation aerobiotic fermentation cylinder, its includes jar body, agitator and blast pipe, the lower extreme of blast pipe is located agitator below, its characterized in that: the air mixer is characterized by further comprising an air mixer, wherein the bottom of the tank body is provided with a mounting hole coaxial with the tank body; the air mixer comprises a speed reducing motor, a connecting sleeve and an outer cylinder which are coaxially connected from bottom to top, wherein the upper end of the connecting sleeve is fixedly connected with the mounting hole and sealed, the outer cylinder is mutually communicated with the connecting sleeve, the outer cylinder is inserted into the mounting hole and positioned below the air supply pipe, and leakage holes are formed in the circumferential direction of the cylinder wall of the outer cylinder at intervals; the main shaft of the speed reducing motor is inserted into the connecting sleeve, the upper end of the main shaft is coaxially and fixedly connected with a rotating shaft, and the lower end of the rotating shaft is rotatably connected with the connecting sleeve and sealed; the upper end of the rotating shaft stretches into the outer cylinder, blades I are uniformly arranged at intervals along the circumferential direction of the rotating shaft at positions corresponding to the drainage holes, the blades I are of rectangular plate-shaped structures and are arranged in a downward inclined mode, and a cutting gap is reserved between the circumferential edge of each blade I and the inner wall of the outer cylinder; under the stirring of the first blade, the compressed air and the fermentation liquor transversely flow out of the outer cylinder through the cutting gap and the drainage hole, and in the process of flowing out of the outer cylinder, the air is cut into countless very fine bubbles to be contacted with the fermentation liquor, so that the air and the fermentation liquor are fully mixed;
the stirrer comprises a stirring shaft and blades, wherein the upper end of the stirring shaft is connected with the rotation power of a stirring motor, at least two layers of blades are arranged along the axial direction of the stirring shaft, each blade comprises a central sleeve and a second blade, the central sleeve is sleeved and fixedly connected on the stirring shaft, the second blades are provided with a plurality of blades which are uniformly and fixedly connected on the peripheral wall of the central sleeve at intervals, and the second blades are of a rectangular plate-shaped structure and are arranged in a downward inclined manner; the stirrer only needs to convey the fermentation liquor in the center of the tank body from top to bottom and enable the fermentation liquor at the bottom of the tank body to rise along the inner wall of the tank body;
The included angle between the plate surface of the first blade and the axial direction of the rotating shaft is 15-35 degrees; the cutting gap is 0.8 mm-1.2 mm; a connecting flange is fixedly connected to the mounting hole, an upper flange is formed at the upper end of the connecting sleeve, the upper flange is fixedly connected with the connecting flange through bolts, and a sealing ring is further arranged between the upper flange and the connecting flange; the drainage holes are kidney-shaped holes which are vertically arranged and are uniformly arranged at intervals along the circumferential direction of the outer cylinder; the height of the first blade is greater than or equal to the height of the drainage hole; the rotating speed of the rotating shaft is 1500 r-3600 r/min; the included angle between the plate surface of the second blade and the axial direction of the stirring shaft is 45 degrees; the diameter of the blade is 1/5 of the diameter of the tank body, and the height of the blade II is 1/25 of the diameter of the tank body.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811626097.1A CN109706059B (en) | 2018-12-28 | 2018-12-28 | Improved aerobic fermentation tank |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811626097.1A CN109706059B (en) | 2018-12-28 | 2018-12-28 | Improved aerobic fermentation tank |
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| CN109706059A CN109706059A (en) | 2019-05-03 |
| CN109706059B true CN109706059B (en) | 2024-05-17 |
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| CH559060A5 (en) * | 1973-12-21 | 1975-02-28 | Mueller Hans Maennedorf | Aerator for aerobic fermentation - permits larger amts. of gas to be dispersed than previously |
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