CN100460496C

CN100460496C - Fermentation tank for monitoring fermenting process of grape wine according to fermentation exhuast gas concentration

Info

Publication number: CN100460496C
Application number: CNB2003101222330A
Authority: CN
Inventors: 高畅; 李华; 高树贤; 沈忠勋
Original assignee: Northwest A&F University
Current assignee: Northwest A&F University
Priority date: 2003-12-30
Filing date: 2003-12-30
Publication date: 2009-02-11
Anticipated expiration: 2023-12-30
Also published as: CN1683493A

Abstract

The grape wine fermenting tank has its fermentation process monitored through on-line CO2 concentration detection of the exhaust, and this is easier compared with available on-line detection of alcohol concentration, glucose concentration and fermented liquid density. The grape wine fermenting tank is provided with CO2 gas exhaust pipe, CO2 concentration detecting instrument and CO2 gas flow meter connected to the CO2 gas exhaust pipe, filtering net set in the inlet of the CO2 gas exhaust pipe, and cooling jacket around the tank and with heat exchanger inside the jacket.

Description

A kind of fermentor tank according to fermentation exhaust concentration monitor Fermentation of Grape Wine

One, technical field:

The present invention relates to a kind of wine fermentation device, especially relate to a kind of fermentor tank according to fermentation exhaust gas concentration lwevel monitoring Fermentation of Grape Wine.

Two, background technology:

Yeast cell discharges a large amount of CO in the Fermentation of Grape Wine ₂, according to the mechanism of zymamsis, the reaction formula that glucose fermentation generates alcohol is:

C ₆H ₆O ₁₂＝2C ₂H ₅OH+2CO ₂

1mol (180g) glucose fermentation generates 2mol (92g) alcohol and 2mol CO in theory ₂(88g, about 44.4L), alcohol and CO ₂The two mass ratio is 0.956.The grape wine that fermentation 1L alcoholic strength is 12 ° need consume 216g glucose, produces 56L CO approximately ₂Gas.

Cell is used to constitute cellular constituent and decomposition generates energy ATP because some substrates enter in the actual alcoholic fermentation process, and fermentation byproduct (3.3% sugar changes glycerine into, 0.6% sugar is transformed into organic acid, also have acetaldehyde, fusel wet goods in addition) generation, actual conversion is 95% of a theoretical yield, the generation coefficient that is actual alcohol is about 0.95, and about 95% is transformed into alcohol (51.1% * 0.95=48.54%) and CO in the glucose of yeast utilization ₂(2 * 44.07/180=0.489,48.9 * 0.95=46.5%), the CO of generation ₂Equal substantially with the quantity of alcohol.

Need monitoring in real time and control course of fermentation in the fermenting process.Present domestic wine fermentation majority is to measure the fermented liquid variable density to come observation process.General method is that artificial timing sampling is measured proportion, by the variation of monitoring fermenting process fermented liquid density (or proportion), draws fermentation diagram, and with this judge that fermentation carries out normally whether.Variable density is actually the external manifestation of chemical composition change such as sugar, ethanol concn in the fermented liquid.Measure under the inconvenient situation when the sugar in the fermented liquid, alcoholic content, density is the significant parameter that can accurately reflect course of fermentation as physical parameter.The most direct monitoring parameter of zymamsis is the increase of ethanol concn and the consumption of sugar.Yet there is following practical problems in the online detection of Fermentation of Grape Wine density:

(1) variable quantity of measured signal is little

Generate 1% (v/v) alcohol with 18g/l sugar in the Sucus Vitis viniferae, if produce 12v/v (%) grape wine, require to contain in the corresponding Sucus Vitis viniferae sugar and be 216g/l, its proportion is about 1.092, and density is about 1092g/l.Fermentation generates 12% proportion vinous and is about 0.992 ~ 0.996.The absolute change amount that becomes its proportion of grape wine from the Sucus Vitis viniferae to the fermentation ends is 0.096 ~ 0.100, and this just requires testing tool to have very high tolerance range.

(2) there is the influence of disturbing test result in the fermenting process

The CO that fermentation produces ₂Gas exists upwards pushing effect to fermented liq, and the circulation of technological operation, tank switching produce forced convection, make jar inner fluid be up and down around flow state, be dynamic process.When fermentation was in vigorous stage, the undesired signal that liquid-flow produces was greater than the variable quantity of measured signal density, made measurement result be difficult to identification and distinguished undesired signal and tested number.

(3) in the fermented liquid various materials to the influence of test result

After the contact density sensor is immersed in and uses for some time in the fermented liquid, some solid substance that contains in the fermented liquid (as the winestone of crystalline deposit generation and the biogenic sediment of yeast and the formation of residual body thereof) can stick to sensor surface, causes the confidence level of measurement result greatly to reduce.

In conjunction with Production of Wine reality, fermentation is promptly carried out under normal pressure in open container, and the wine fermentation temperature maintenance is (dry red winew 26-30 ℃, Dry white wine 18-20 ℃) in the scope of process stipulation, under certain pressure, certain temperature, CO in the liquid ₂Solubleness is constant.Existing wine fermentation tank is open, dissolved CO in fermented liquid ₂When concentration reaches capacity, remaining CO ₂Be discharged in the surrounding environment by the liquid phase effusion and through the fermentor tank mouth, be discharged to outdoor by forced ventilation or natural convection.

According to the fermentation kinetics theory, exhaust CO ₂Concentration and CO ₂Rate of release (the CO that unit time, unit substrate produce ₂Concentration is represented with CER) can be used as the reflection course of fermentation key character, CO ₂Burst size can be used as the index of monitoring fermenting process, CO ₂Rate of release (CER) is associated with fermentation rate.

Three, summary of the invention:

The present invention is in order to solve the weak point in the above-mentioned background technology, a kind of fermentor tank according to fermentation exhaust gas concentration lwevel monitoring Fermentation of Grape Wine is provided, adopt soft-measuring technique to realize the on-line determination of fermentation, be beneficial to the control fermentation, promptly use the parameter (exhaust gas concentration lwevel and flow) of easy on-line determination to replace the parameter (ethanol concn, glucose concn and fermented liquid density etc.) that is difficult for on-line determination, just can be according to wine fermentation exhaust CO ₂Concentration and flow monitoring fermenting process.

For achieving the above object, the technical solution used in the present invention is:

A kind of fermentor tank according to fermentation exhaust concentration monitor Fermentation of Grape Wine, its special character is: comprise tank body, be provided with the carbon dioxide discharge line on pot body closing end, the carbon dioxide discharge line is provided with carbon dioxide concentration determination instrument and flow of carbon dioxide gas amount meter.

The inlet mouth place of above-mentioned carbon dioxide discharge line is provided with a filter screen.

On the above-mentioned fermentor tank safety valve is installed.

Compared with prior art, the advantage and the effect that have of the present invention is as follows:

1, the present invention is according to exhaust CO ₂Concentration and flow are directly monitored fermenting process, have replaced regularly worker's sampling and measuring fermented liquid density of people, have reduced a large amount of mensuration workloads, have reduced personnel's labour intensity, can realize the on-line monitoring course of fermentation;

2, the present invention also is applicable to the oxysuccinic acid-lactic fermentation of low temperature dipping, clarification and red wine that the fermentation of Fructus Vins juice is preceding etc.

Four, description of drawings:

Accompanying drawing is a structural representation of the present invention.

Five, embodiment:

Referring to accompanying drawing, this fermentor tank is the vertical type cylinder body structure, is made up of tank body, jar end, ellipsoidal head 5, outside sandwich interchanger, liquidometer 2, sampling valve, manhole 13, opening for feed 7, unstrained liquor outlet 15, pure mellow wine outlet 14, sewage draining exit 1 etc.On pot body closing end 5, be provided with carbon dioxide discharge line 8, carbon dioxide discharge line 8 is provided with carbon dioxide concentration determination instrument 9 and flow of carbon dioxide gas amount meter 10, METHOD FOR CONTINUOUS DETERMINATION is discharged gas concentration lwevel and two parameters of gas flow, the monitoring course of fermentation.Be installed in the accurate metered flow of gas meter 10 on the exhaust line; Concentration determination instrument 9 can be measured exhaust concentration.By to flow semi-invariant and concentration determination, just can calculate the amount of the product alcohol of substrate glucose that a certain moment accumulative total in fermentation consumes and generation, the monitoring fermenting process.The inlet mouth place of carbon dioxide discharge line 8 is provided with a filter screen 11, avoids entering gas exhaust duct owing to contain small amount of solid (mainly being the pericarp of not Ex-all) in the Sucus Vitis viniferae.The tank body outside surface is provided with cooling jacket 3, and cooling jacket 3 is made of tank wall and chuck wall, and the chuck wall connects airtight in tank wall, is provided with interchanger in the cooling jacket 3, has heat-eliminating medium on the cooling jacket 3 and imports and exports 4.For improving the heat exchange effect, make heat-eliminating medium present turbulence state, interchanger perforated plate 12 surfaces distribute regularly cellular pit, pit and tank wall spot welding.In addition,, safety valve 6 is installed on fermentor tank, avoids because the accident that some Special Circumstances (as the bubble desert of fermentation generation, the pericarp of not Ex-all etc.) cause exhaust line freely may not occur in order to guarantee safety.For ease of raffinate in the drain tank and rinse water, jar baseplane is to be the inclined-planes of 2～5 degree with horizontal plane angle.Also be provided with opening for feed, manhole and pure mellow wine outlet and unstrained liquor outlet on the tank body.

Claims

1. fermentor tank that detects Fermentation of Grape Wine according to fermentation exhaust concentration, it is characterized in that: comprise tank body, be provided with carbon dioxide discharge line (8) on pot body closing end (5), carbon dioxide discharge line (8) is provided with carbon dioxide concentration determination instrument (9) and flow of carbon dioxide gas amount meter (10).

2. a kind of fermentor tank according to fermentation exhaust concentration detection Fermentation of Grape Wine according to claim 1, it is characterized in that: the inlet mouth place of described carbonic acid gas discharge line (8) is provided with filter screen (11).

3. a kind of fermentor tank according to fermentation exhaust concentration detection Fermentation of Grape Wine according to claim 1 and 2 is characterized in that: safety valve (6) is installed on the described fermentor tank.