最近中文字幕在线资源,久久国产精品偷,国产强被迫伦姧在线观看无码,成熟女人特级毛片WWW免费

歡迎來(lái)到冀群(江蘇)儀器有限公司網(wǎng)站!
咨詢熱線

13236572657

當(dāng)前位置:首頁(yè)  >  技術(shù)文章  >  英國(guó) Labplant 噴霧干燥儀在奶粉中的應(yīng)用

英國(guó) Labplant 噴霧干燥儀在奶粉中的應(yīng)用

更新時(shí)間:2021-11-30  |  點(diǎn)擊率:1887

英國(guó) Labplant 噴霧干燥儀在奶粉中的應(yīng)用

 

Labplant spray dryer tests

 

 

The milk used was reconstituted in the following way:

 

200g  milk powder

 

1.7L of tap water

 

giving 2L of milk with a measured density of 1.045 at 21’C.

 

We used a fixed flow, whatever the experiment ; pump flow set at 5, corresponding to

13.5mL/min.

 

Varying the injection temperature of the product

 

We did a first test with an injection temperature of 130’C and then a second test at 140’C.

 We saw that spray drying was achieved, apparently, comfortably at these two 

temperatures.Effectively no liquid ran along the walls of the main spray chamber, even at

130’C. This meant that we could work at 140’C or 130’C given the stipulated flow.

In theory it is preferable to work at 140’C, because the higher the temperature the better

the yield. We will try to prove this through our experiments.

 

Varying the compressed air ratio / feed flow

 

 

We worked with a flow set at 5 (13.5mL/min) and compressed air set at 3 bars

(constant air inlet valve opening).

 

In theory to increase the size of the agglomerate, it is necessary to favour the agglomeration

 mechanism over the drying process. One of the possible means is to decrease the spraying

 rate. In the case of this equipment, to decrease the spraying rate you can either decrease the

flow of compressed air through the injection nozzle (while keeping a constant pressure) or

you can decrease the pressure of the compressed air (while keeping a constant flow).

 

Therefore we tried two tests with constant air and liquid flows, varying the pressure from 2

to 3 bars.We observed the look of the powders we obtained ; it was difficult to decide just

with the naked eye, an additional granulometric(?) study would be necessary, but it did seem

that the powder obtained with 3 bars of pressure was effectively finer than that obtained with

 2 bars.

 

Research into the effective operational limits of the spray dryer

 

 

We retained the same solution of reconstituted milk.

 

At a given flow and pressure of air, we increased the flow of liquid from level 5

(13.5mL/min) to level 10 (28.8mL/min). We very quickly saw that the formation of the

spray in the atomisation tube was not good : in effect the quantity of liquid going through

the tube was too much and could not be vaporised on exiting the tube. This was why we had

some liquid that ran out of the tube, ran along the walls of the spray chamber, of the fan

chamber (cyclone?) and even in the recuperation chamber. Under these conditions the yield

of finished product would be bad.

 

QUANTITATIVE STUDY

 

 

The experiments carried out and the experiment details are given below.

 

Experiment 1 : starting from 100g/L of reconstituted milk

 

Amount of milk powder

 200g


Amount of water

  1700g


Volume of milk

2L


Density of milk

      1.045g/mL


Humidity of milk

        89.47 % mas


Injection temp (??)

  130’C


Injection flow

       13.5mL/min


Working time

  40 min


Compressed air pressure

 3 bars


Humidity of labo

     21.8 %HR

   6g vapour / m3 air

Ventilator flow

   70 m3/h


Gas exit temp

77’C


Air exit humidity

    18.8 %HR

    21.3g vapour / m3 air

Bottle size

339g


Bottle + wet milk

391.9


Bottle + dry milk

           390


 

From the experiment details we calculated the following:

 

humidity of the milk : 100 x water mass (water mass + powder mass)

 

numerical application : % humidity of the milk = 100 x 1700/(1700+200) = approx 89.5%

the mass of the wet milk we collected = 391.9 – 339 = 52.9g

 

the mass of the dry matter we collected = 390 – 339 = 51g

 

humidity of the solid = 100 x (52.9 – 51)/52.9 = approx 3.6%

 

Materials ‘balance sheet’ of the dry milk over the life of the experiment:

 

at the start : dry matter is the result of the solution to be tested

 

at the exit : dry matter of the solid that was obtained

 

Numerical application

 

a) at the start : 13.5mL/min x 1.045 g/mL x 40 min x (100-89.47)/100 = approx 59.4g

b) at the exit : 51g

 

c) solid yield = 100 x 51 / 59.4 = approx 85.9%

 

Materials ‘balance sheet’ of the water over the life of the experiment

 

b) at the start : (13.5mL/min x 1.045 g/mL x 40 min x 89.47 / 100) + 70 m3/h x 6 g/m3 x40/60 = 784.8 approx of water

 

c) at the exit : (52.9g x 3.6 /100) + (70m3/h x 21.3 g/m3 x 40/60) = approx 995.9

 

d) water yield = 100 x 995.9 / 784.8 = approx 127%

 


韩国三级中文字幕hd久久精品| 精品国精品国产自在久国产不卡| 麻花豆剧国产mv免费| 欧美丰满熟妇多毛XXXXX| 囯产精品一区二区三区线| 人妻无码一区二区三区| 越南小少妇bbwbbwbbw| 久久99国产精品久久99果冻传媒| 亚洲成AV人片在线观看无| 国产一性一交一伦一a片| 国产亚洲av片在线观看18女人| 亚洲AV极品无码专区在线观看 | 人妻 白嫩 蹂躏 惨叫| 久久天天躁狠狠躁夜夜不卡| 久久99国产综合精品尤物| 亚洲色欲啪啪久久WWW综合网| 欧美日韩精品视频一区二区| 色欲久久久天天天综合网| 亚洲无码一区二区三区| 最近中文字幕高清字幕| 国内熟女精品熟女a片视频| 一本大道无码人妻精品专区| 欧美人与动人物牲交免费观看| 国产大人和孩做爰bd| 亚洲人成色7777在线观看| 色偷偷偷久久伊人大杳蕉| 影音先锋人妻啪啪av资源网站| 精品久久久久成人码免费动漫| 国产精华2020| 免费特级毛片| 免费b站推广网站| 国产av无码专区亚洲av男同| 综合自拍亚洲综合图区av| 夫妇交换刺激做爰视频| 国产优优A片在线观看| 伊人久久综合无码成人网| 啦啦啦资源在线观看视频| 18欧美乱大交| 野花香高清视频在线观看免费| 亚洲成av人片在线观看无码麻豆| 欧美人与动交zozo|