CN2161621Y

CN2161621Y - Vortex ventilation device

Info

Publication number: CN2161621Y
Application number: CN 93204945
Authority: CN
Inventors: 洪中元; 赵柏松
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-02-24
Filing date: 1993-02-24
Publication date: 1994-04-13
Anticipated expiration: 2003-02-24

Abstract

The utility model discloses a novel air-distributing device, which is used in ventilation fermentation tank structure used in the industrial field of the chemical industry, the food industry, the pharmacy industry, etc. The utility model is composed of a fermentation tank, a stirring wheel, an air inlet pipe and nozzles, and the air distributing part of the utility model is an annular structure which is composed of an air storage tube, a support tube and a plurality of nozzles. The front part of parts of the nozzles and a liquid conveying guide tube are merged to form an air and liquid mixing conveying nozzle. A guide air part is composed of an inner cylinder and an inner component blade and installed on the bottom of the central tank of the annular structure of the air distributing part. The utility model has the advantages of high dissolving oxygen level, large air-liquid contact surface, even and sufficient mixing, high fermentation liquid and gas comprising rate, simple structure and low cost, and is suitable for the technical improvement of the old type fermentation tank.

Description

Vortex ventilation device

The utility model belongs to chemical machinery field, is a kind of novel air distribution apparatus in the ventilating fermentation jar structure, i.e. injection type eddy current ventilation plant.

At industrial circles such as chemical industry, food, pharmacy, ventilation fermentation tank is a metabolism of utilizing the aerobic microorganism, fermented liquid is changed into the chemical industry fermentation engineering conversion unit of leavened prod (as L-glutamic acid, citric acid, liquid koji, zymin, antibiotic, yeast etc.).The effect of the air distribution device in fermentor tank is: each stage of growth and breeding, metabolism and formation tunning is blown into no microbiological contamination air during the fermentation for microorganism, and the mat whipping appts makes even air distribute the oxygen that is consumed in the hope of constantly providing microbial respiratory.The effect of whipping appts is a bubble crushing, allows air and solution uniform mixing, increases contact area, and airborne oxygen is dissolved in the fermented liquid.Owing to stir the different distributions that causes jar interior pressure, when bubbling air flows, also caused air uneven distribution in the fermented liquid.Therefore, how improving big jar scantlings of the structure, how to upgrade air distribution device and whipping appts, to improve its dissolved oxygen level, is a big problem of fermentation engineering equipment.

At present commonly used have following several air distribution device, and a kind of is rotary-type distribution pipe, has used 3-4 root arm to be communicated with pipe core with tangential direction, and air sprays from pipe core with the rotation form.A kind of is annular perforated tube, and three row's apertures are set on ring pipe.Another kind is the single hole pipe, it be installed in stirring wheel under, mouth of pipe center down and at the bottom of the jar, during ventilation, air rises around the mouth of pipe, by rotating stirring wheel fragmentation, and carry secretly with liquid stream and to be distributed in entirely jar, this apparatus structure is simple, and the air dispersion effect is better.Adopt more, but because gas velocity is low, big and the straight line rising of bubble, the mouth of pipe is far away apart from stirring wheel in addition, and the air pocket of rising is influenced by liquid stream, easily escapes from the local periphery of stirring wheel, the bubble breaking effect is still undesirable, so that reduced drafting efficiency, in addition, at the dead angle that the jar bottom perimeter also exists air to be difficult to arrive.

The purpose of this utility model is to provide a kind of novel air distribution device, i.e. injection type eddy current ventilation plant, and it can overcome some shortcomings of original device, and dissolved oxygen level is improved, and the gas-to-liquid contact interface increases, and mixes, fully.

By the injection type eddy current ventilation plant that the utility model proposes, it is made up of fermentor tank, stirring wheel, inlet pipe, nozzle, it is characterized in that being provided with two parts of gas distribution and air guide, air distributing part is formed a ring structure by cylinder, support tube, a plurality of nozzle, converge composition gas-liquid mixed delivery nozzle in portion nozzle the place ahead and fluid delivery conduit, air guide part is made up of inner core and internals blade static mixer, on it is installed at the bottom of the center tank of gas distribution ring structure.

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is the utility model fragmentary top TV structure figure.

Fig. 3 is the connection sectional view of the utility model gas-holder, bearing pot, nozzle.

Embodiment is explained in detail the utility model below in conjunction with accompanying drawing.

The utility model has gas distribution and two independent sectors of air guide, and air distributing part (cloth compression ring) is placed in the bottom of fermentor tank 1, an annular cylinder 4 is arranged and be close to the ring-shaped bearing pipe 5 of its inner ring, have on the cylinder 4 pipe connecting flange and jar inlet pipe 3 be communicated with.Cylinder 4 volumes are very big, and its effect is gas storage, and equilibrium keeps air pressure and gives the even gas distribution of each nozzle.Support tube 5 is mounting bases of each nozzle 6, nozzle 6 be divided into six groups uniform on support tube 5, its mouthful warp is 5～6 millimeters of φ, jet velocity 120～160 meter per seconds.The total number of nozzle is pressed following formula and is determined:

Z＝ (4QP)/(πd ²·3600·P _LV _S)

In the formula: the Q--fermentation intermediary and later stages feed a jar interior air flow quantity (rice ³/ time)

P ₀--normal pressure 0.1MPa

D--nozzle diameter (rice)

P _L--the absolute environmental stress in spout place (operation pressure+liquid gravity pressure), P _L=0.22MPa

Vs--air spray speed (meter per second)

Z should be 6 integral multiple, can adjust two parameters of d and Vs and satisfy, and the quantity of every group of nozzle is: n=Z/6.Every group of nozzle is mounted to the different α that cuts angle on horizontal plane, so that when making the jet (parallel-flow beam) of each nozzle ejection feed fermented liquid, and the motion of revolving that has that can produce different radiuses of rotation R, the sense of rotation of its direction and stirring wheel 2 is opposite; Each nozzle is mounted to different elevation angle β again on vertical surface, disturbs to avoid respectively restrainting effusive, and it is 0 °-10.5 ° that destruction has the design rule that revolves motion, β span.Because the existence of angle [alpha] and β makes each beam stream produce the eddy current of different radiuses of rotation R separately in several fermentation levels, encloses first-class cloth at each R and six bundle peripheric jet flows.In addition, in the vortex field that several level jets form, its vorticity is that the upper strata is higher than lower floor, and the outer ring is higher than inner ring, and according to the eternal principle of hydromeehanics vortex, when each restrainted the swirling eddy rising, its track all was spiral-linees through pitch such as a grade, never scattered and disappeared and escaped.But in fact under the liquid viscosity effect, slowly weaken and disappear.Like this, much longer times of the distance that the distance that air-flow is walked in fermented liquid rises than single hole pipe bubble straight line, thus prolonged the residence time of air-flow in fermented liquid widely.In addition, because from top to bottom, vorticity from outside to inside is not quite similar in the several levels of fermented liquid, and the viscosity effect of fermented liquid, according to hydromeehanics about the diffustivity of vortex in viscous fluid: vortex will be carried to weak place in the place that vorticity is big, till intensity equates.Not waiting and diffustivity of vorticity, make the gas be in each vortex field, liquid two-phase between levels and Internal and external cycle, strengthened shearing action and paid a stream effect, produce the intensive turbulent flow, make gas, liquid two-phase contact interface constantly obtain upgrading, thereby improved mixed uniformly ventilation effect.

In order to make full use of compressed-air actuated kinetic energy, improve fluid circulation usefulness, this device is equipped with gas-liquid mixed delivery nozzle 9 on several nozzles, for example can install every a nozzle, promptly on the nozzle of half, install, at the jet hole place, gas-liquid mixed carries the mouth to draw a fluid delivery conduit 10, around at the bottom of the catheter opening end is guided into jar, it can be attracted to mixing section to the fermented liquid at place, dead angle at the bottom of the jar, carries out gas, the fierce turbulent flow of liquid is mixed, and fermented liquid is broken into mean diameter is 2 millimeters drop, its mixed flow sprays from mixing the delivery nozzle mouth again, thereby forms first fluid race way inside and outside the cloth compression ring.Like this, in a fermentation period, just the fermented liquid that is in cloth compression ring outer ring in the jar can be circulated 1.5～2 times, and make gas-liquid two-phase obtain mixing fully and uniformly.

The cylinder center ring of cloth compression ring directly is 1.2 times of stirring wheel diameter, and the spout of each nozzle all is in the scope of 0.8 times of stirring wheel diameter like this, all is stirred the wheel fragmentation and unlikely escape to guarantee the air-flow that rotation is risen.For ease of loading and unloading with remove incrustation in the nozzle, the cloth compression ring is made 120 ° three joints, and with flange 11 fastening connection one.

The utility model air guide part (gas cylinder) is made up of inner core 7 and internals blade 8, and it is installed in the jar at cloth compression ring center at the end, and inner diameter of steel flue is 0.9 times of stirring wheel diameter, so that the high speed that the gas distribution ring spray is gone out has the jet beam of revolving all to collect wherein.After jet beam is taken advantage of a situation and entered inner core, under the guiding of internals blade, be forced to cut apart and spread, and by new rule do rotation upward movement, by tube discharge suitable for reading, make air-flow be stirred wheel and be broken into extremely fine bubble colony, carry secretly by liquid stream again and be distributed in complete jar.Because air-flow concentrates in the tube entirely, gas, liquid mixed flow density in the tube are little, and the outer fermented liquid density of tube is big, and therefore, under the promotion of density difference, an outer liquid stream attracted to and comes in the tube, and participates in gas, the mixing of liquid turbulent flow, forms inside and outside second the liquid stream of tube race way.What the gas distribution ring spray was come has the jet beam of revolving speed bigger, and its intensity of circulation is also fiercer.

The utility model has the advantage of: the dissolved oxygen level height; Gas, liquid contact interface are big, mix, fully; Zymotic fluid gas holdup height; Simple in structure, low cost of manufacture; Be suitable for the technological transformation to old-fashioned ventilation fermentation tank, increasing output, carrying under the high-quality prerequisite, reduce specific air consumption and reduce power of agitator, thereby improve the technical-economic index of old-fashioned fermentation tank.

Claims

1, a kind of injection type eddy current ventilation plant, it is made up of fermentor tank, stirring wheel, inlet pipe, nozzle, it is characterized in that being provided with gas distribution and air guide two portions, air distributing part is by cylinder, support tube, a plurality of nozzle are formed a ring structure, converge in portion nozzle the place ahead and fluid delivery conduit and to form the gas-liquid mixed delivery nozzle, the air guide part is made up of inner core and internals blade, and it is installed at the jar end at center of gas distribution ring structure.

2, by the described injection type eddy current of claim 1 ventilation plant, it is characterized in that nozzle be divided into six groups uniform on support tube, every group of nozzle is mounted to the different α that cuts angle on horizontal plane, each nozzle is mounted to different elevation angle β on vertical surface, and the β value is 0 °-10.5 °.

3, by claim 1 or 2 described injection type eddy current ventilation plants, it is characterized in that the gas-liquid mixed delivery nozzle being installed thereon every a nozzle, carrying the mouth to draw a fluid delivery conduit, at the bottom of the catheter opening end is guided into jar around.