国产精品久久久久久吹潮,精品无码国产污污污免费网站,欧美成人精品第一区二区三区,欧美zc0o人与善交另类a片

歡迎來(lái)到冀群(江蘇)儀器有限公司網(wǎng)站!
咨詢(xún)熱線(xiàn)

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:2355

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%

 


婷婷人人爽人人爽人人片| 麻豆AV无码精品一区二区| 你是我的女人6免费观看| 欧美大尺寸suv欧美| 日韩少妇成熟a片无码专区| 国产色情精品一区二区| 拔萝卜未删减版hd| h漫无码动漫av动漫在线播放| 我的少妇邻居全文免费| 欧美日韩国产精品| 黑人猛挺进小莹的体内视频| 日韩AV无码AV免费AV不卡| C了瑜伽老师一节课网站| fc2成年免费共享视频| 伊人久久综合热线大杳蕉岛国| 中国青年gary东北大飞机打桩| 与我同眠在线观看| 超碰caoporen97人人| 欧美日韩在线亚洲综合国产人| 好大好硬好深好爽想要 叫床| 国产小呦泬泬99精品| 国产a国产片国产| 久久aaaa片一区二区| ass年轻少妇浓毛pics| 精品国产亚洲一区二区三区在线观看| 无码人妻丰满熟妇区毛片| 大桥未久亚洲无av码在线| 舌头伸进去添的我好爽高潮| 亚洲熟妇丰满XXXXX| 日韩精品中文字幕无码一区| 亚洲精品无码专区在线| 喘声2分30秒戴好耳机| 四虎影视永久地址www成人| 欧美性69式xxxx护士| 最近免费中文mv在线字幕| 人狗胶配方大全免费| old欧美老妇videos| 在线香蕉精品视频| 无需付费真人直播视频| 少妇又紧又色又爽又刺激视频| 嫩草伊人久久精品少妇av|