For low-temperature freezing broken algae discussion

An Overview
Algae carry out deep cryogenic grinding technology research, development series of health food and convenience foods, in line with China's "food structure nineties China Reform

and Development Program" proposed "nutrition, health care, educational, Yanshuai" development strategy requires , to improve our people

(Especially children) nutritional qualities, is of great significance to the promotion of aquaculture development of new products will also play an important role, and will

generate significant social and economic benefits.

Two main processing technology research

Algae variety (such as kelp, seaweed, Eucheuma, Sargassum, etc.), but the process is roughly the same. Such as basic process: a variety of pre-processing of raw materials → →

→ Vacuum cryogenic freezing cold crush → drying → → → product packaging sterilization. According algae deep hypothermia

Freeze grinding process and the development direction, the main contents include the following basic research and product development, sexual content: (a) to study various algae

pretreatment methods, including pre-cooling, heating, fishy and so on.

(2) The cold brittleness algae presents a glass transition temperature; research on a variety of different temperature conditions granularity of algae. The higher the

temperature the more low cost and must therefore be optimized through a comparative study of cold brittleness can choose both to ensure the best possible cost reduction freezing

temperatures.

Effects of different temperature conditions, different vacuum conditions on the nutritional composition.

(3) Based on the findings, to develop the production of algae ultra-fine powder processing technology.

(4) adding other ingredients of algae powder made from a variety of functional snack food processing (such as a variety of convenient packaging style food, puffed food, etc.).

(5) research algae as a food additive concentrate added processes, such as nutrition rice products (bread, pasta, instant noodles, frozen bread and other pastries Hanamaki) and

nutritional soy products (tofu, such as nutrition, nutrition milk, etc.) to add volume and add methods and so on.

(6) study of algae production and processing of health care products, such as capsules, tablets, granules, etc.

In addition, the need for clinical application research, through clinical eating, testing and contrast micro algae powder processed products and traditional processing dry goods

on the human body absorption rate, determine the product's absorption effect, and select the appropriate size and add product concentration. Conditional, may

Organized by the relevant government departments for children's book groups consumed survey results, it is with great practical significance and the importance of social

studies.

As a new product, the need to study and formulate relevant quality standards, including the requirement to maximize the juice to keep the raw material and physical activity;

ensure that the finished product has the same ingredients consistent color, smell, taste, and has a relatively high body absorption rate; Specifically, provisions must be

clearly particle size

Indicators, such as average particle size should be less than 9 microns, etc.; also need to develop specific water content, total bacterial and E. coli and other indicators;

well as shelf life and so on. Products must meet the relevant standards of food hygiene requirements.

Three main processing equipment technology research

According algae deep cryogenic grinding process, the main processing equipment including cryogenic cooling source, vacuum drying and grinding, vacuum drying technology and

equipment which is more mature, it is critical cryogenic cold source and crushing equipment , therefore, the development of deep cryogenic grinding Algae ultrafine

Products based on one of the conditions is to develop a new type of cryogenic grinding equipment, including compliance with China's national conditions, lower-cost cooling

source, and fine granularity meet the requirements of grinder.

3.1 cold source to achieve the purpose of finely pulverized materials for cryogenic cooling source two basic requirements: First, have a sufficiently low boiling point, brittle

materials to achieve the degree of cold; Second, we must be able to quickly remove the material in the grinding process converting the kinetic energy generated due to the heat,

to avoid material as

The rise of temperature recovery toughness and food nutrition changes, thus ensuring the quality of the material during milling. At home and abroad using cryogenic liquid

nitrogen or cold source is basically a liquefied natural gas, including liquid nitrogen as non-toxic and non-flammable, odorless, reached its boiling point at atmospheric

pressure - 196 ℃

, Sufficient to make the most of the material presented cold brittleness, therefore it has become a major source of cold application. As in Japan, the first with liquid nitrogen

frozen rice, soy, meat, vegetables, spices and other food ingredients, followed by grinding mill into and maintain a constant temperature with liquid nitrogen. Granularity is

the use of

The mill opening slot board be adjusted. Micro-grained up to 0.06 mm or less, either crushed fatty meat, food ingredients, you can also create a new type of health food

products.

However, in the domestic application of liquid nitrogen cold source there is a big problem, that is, high cost, high-value products for the turtle products is acceptable, while

algae may affect the application of its marketing. Therefore, whether the application at home and abroad in recent years, the emergence of new cold source such as the current

number of domestic

Research institutes, universities and other research in the gas wave refrigerator.

Gas wave refrigerator is a new expansion of the air cooler at home and abroad has more mature technology and preliminary products can be produced from - 125 ℃ cold air, the

light hydrocarbon recovery in the oil and natural gas dehydration unit in medium have been applied.

3.2 grinding equipment: In the research and development of new coal crusher machine equipment, domestic Currently, some research institutes, universities and enterprises in the research,

and made progress. Such as the application cryogenic grinding steel scrap tires, this work has environmental recycling double

Significance. Tire rubber at room temperature for the ductile materials, crushing difficult, power consumption is also large, and when broken produce a lot of heat, so that the

rubber aging, the quality deteriorates, so the tire rubber is difficult to reach room temperature crush crush more than 30 mesh size. The use of the rubber at low temperature

embrittlement

The physical properties of the recovered waste tire placed under low temperature grinding, in order to obtain fine powder freezer recycling. Currently industrialized Western

countries has been achieved. In addition, China is studying along with ultra-fine ceramic powder processing, manufacture of advanced ceramic products are Off

Key technologies.

Most of the conventional grinding method using a hammer mill, but the granularity is limited, such as mechanical hammer mill product size is generally not more than 80 mesh, and

there are a lot of heat generated during grinding, impact materials (especially food) quality problem. The granularity of the material

Important economic indicators to frozen powder, for example, 40 mesh market price of frozen powder 100 mesh powder is only half the price. And the finer the particle size, the

wider range of applications.

One of the current direction of applied research is a strong jet milling method (such as scroll jet mill): In the deep hypothermia, the use of supersonic vortex flow impact, so

cold brittleness of the material presented between each other and with the wall of the grinding chamber collisions between, to achieve instant smash.

3.3 New cryogenic grinding system envisaged: the use of cryogenic gas wave refrigerator as cold source alternative to liquid nitrogen, if the cost and technical conditions

permit, would be ideal, because it combines the scroll jet mill to form a new and efficient cryogenic grinding system.

The system is most unique is that organically gas wave refrigerator has a certain cold exhaust backpressure as a grinder of power, either through a nozzle to form high-speed

vortex airflow, but also entrainment occurs so that the material into the crushing room, such a design, in addition to saving power grinder

Source, to reduce the construction cost, but also eliminates the need for mechanical moving parts due to address a number of components in the low speed impact and deep work the

mechanical properties and reliability. In the grinding process of cooling effect and eliminating the influence of the heat generated during grinding. Comprehensive national

The situation inside and outside the research laboratory, high-speed vortex airflow crushing Liaoduo instant smash, can reach 100 m ~ 5 m between, it is entirely consistent

ultrafine algae production requirements.

The system's basic process is: First of algae material provided by general compression refrigeration cold air pre-cooling unit, the temperature reached - 20 ℃ ~ - 25 ℃.

Provided by the gas wave refrigerator approximately - 100 ℃ cryogenic freezing air reaches the glass transition temperature, the temperature controlled at - 60 ℃ or so. Gas

wave

Refrigerator cold exhaust (pressure of about 0. 2MPa gauge pressure) can form a high-speed vortex airflow through the nozzle, the occurrence of the algal material entrainment

enter the crushing chamber, the material of the violent collisions occur instantaneously short brittle crushing, and with the tail gas stream discharge grinding chamber. After

completion of pulverization of the gas

Return to re-cool the refrigerator, and then for the next cycle. The system freezing and crushing operations are run intermittently.