Thursday, October 29, 2020
Wednesday, October 21, 2020
Dehydration processing of food drying equipment
The commonly used methods of dehydration are natural drying and
artificial dehydration. Artificial dehydration includes oven drying, microwave
drying, puffing drying, infrared and far infrared drying, vacuum drying, etc. At
present, the more advanced artificial dehydration method is freeze vacuum
dehydration. The product can not only retain the original color, aroma,
ambiguity and shape of fresh vegetables, but also has ideal rapid rehydration.
The technological process is: raw material selection → cleaning → peeling →
cutting → blanching → cooling → draining → freezing → vacuum drying → sorting →
packaging.
At present, an important trend of food processing technology is to
maximize the nutrition and color and flavor of food, and the selection of food
drying equipment has a great impact on the nutrition, color and flavor of food
products. Food drying is a necessary measure to improve food storage and
quality. The performance of dryer directly affects the quality and value of
dried food. In recent years, China has developed a variety of multi-functional,
high efficiency, low energy consumption, strong adaptability dryer, food drying
technology and equipment has made a lot of progress.
In recent years, China's
food drying equipment has accounted for more than 80% of the domestic market.
Its food drying equipment industry mainly focuses on conventional drying
equipment, which can basically manufacture all kinds of conventional food drying
equipment, and its price is only 1 / 3 of that of foreign similar products,
which makes China's drying equipment have obvious price advantage over imported
equipment in market competition Due to the large volume of drying equipment,
most of them also involve on-site installation, commissioning and after-sales
service, so it is more convenient for domestic users to choose domestic
equipment than imported equipment. This also indicates the end of China's drying
equipment import history.
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Tuesday, October 20, 2020
Flash dryer juice drying
Reasonable design of research objectives, break the bottleneck of Apple industry development in China
China is a major apple producer, accounting for 48% of the world's output and 16% of China's total fruit production. But it is worth noting that China is not a strong apple industry. The development of Apple industry still faces many difficulties: low storage technology and standard level, large storage loss, loss rate of about 10%~15%, much higher than 3%~5% in developed countries; The backward processing technology leads to the quality and safety problems of products such as Browning, excessive secondary precipitation of trotramycin and excessive pesticide residue, which makes the products lack of international competitiveness. The low level of comprehensive utilization of apple dregs and large waste of resources have become the shackles restricting the rapid and healthy development of Apple industry in China.
The goal of energy saving in fruit and vegetable juice processing was realized by using flash dryer drying technology
According to the research objectives and tasks set up, the project started from the national Plan for tackling key problems in the sixth five-year Plan, focused on the key points of national agricultural science and technology innovation in each period, carried out original innovation and integrated innovation research on apple concentrated shrinkage juice processing, comprehensive utilization, storage and preservation, etc., and made many breakthroughs.
The project has established the comprehensive utilization technology system of apple processing by-products: it has created the drying technology of the quick energy-saving dryer and the microwave extraction technology of pectin, invented the quick grading and molecular modification technology of pectin, and developed the high-quality pectin. The technology of flash steaming titian and high-power natural apple flavor were independently developed to realize efficient recovery of fruit juice aromatics. Efficient preparation techniques such as sodium carboxymethyl cellulose were established to provide a new way for the utilization of whole fruit.
The results also systematically studied the pathogenesis and preservation technology of apple tiger skin disease. It was clear that the oxidation product of farnene was the cause of the occurrence of tiger skin disease, and high concentration of CO2 pretreatment after picking could effectively inhibit the occurrence of tiger skin disease. It was found that Fuji apple was highly sensitive to CO2 in storage, independently developed high-permeability CO2 plastic wrap, and constructed a simple air-regulated storage model of low-temperature spontaneous air-regulated bag preservative. A series of standards for apple harvest and storage were established, which laid a foundation for the construction of apple industry technical standard system.
The implementation of the project has achieved remarkable results, breaking a new path for the development of China's Apple industry
The project has passed the project acceptance and result appraisal organized by the Ministry of Science and Technology, the Ministry of Education and other units. Experts agree: the project for the first time the directional adsorption technology to solve the Browning of apple juice concentrate, secondary opacity, control content and pesticide residues, first set up the index system of the characteristics of apple juice and counterfeit detection model, for the first time in apple juice processing technology has carried on the system research, there are a number of technology innovation, project overall level reaches the international advanced, to promote apple juice processing industry in our country's overall level has greatly promoted.
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Monday, October 19, 2020
Dehumidification principle of wood drying equipment
The following is to introduce the dehumidification principle of wood drying equipment:
The dehumidification principle of lumber drying equipment is to use not saturated wet air to blow the wood that is dried, the equipment that absorbs moisture among them, to improve the moisture absorption ability of wet air, heat wet air first commonly. When the wood drying equipment makes the wet air pass through the heater under constant pressure, the outside world heats the wet air and the temperature of the wet air rises. However, the moisture content of wet air is not increased, and there is no condensation and precipitation of steam, so the relative humidity decreases for the same reason, so the hygroscopic ability is improved. It can be seen that the heating process in the heater is a constant humidity process of increasing temperature and enthalpy. When the heated wet air enters the dryer to dry wood, the heat release of the wet air (reducing the enthalpy of the wet air) makes the moisture in the wet material vaporize and enter the air, increasing the enthalpy of water vapor contained in the air. Thus, the drying process can be approximated as a definite enthalpy process in which air temperature decreases gradually and humidity increases gradually.
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Wednesday, October 14, 2020
Operating points of hollow blade dryer
On the basis of absorbing advanced technology at home and abroad, the hollow blade dryer, which is improved and optimized by our company, can indirectly heat or cool paste, granule, powder and paste materials, and can complete unit operations such as drying, cooling, heating, sterilization, reaction and low-temperature calcining. The special wedge-shaped stirred heat transfer blade in the drying equipment has higher heat transfer efficiency and self-cleaning function of heat transfer surface.
1. Discharge condensed water in the steam line, and then close the globe valve.
2. Open the air switch in the electric control cabinet (the corresponding red light will be on) and start the circulation fan in each heating chamber.
3. When the temperature in the drying room reaches 145℃, set the "on" position of the speed regulating motor controller, and then rotate the speed regulating knob clockwise to make the pointer reach the desired position. At the same time adjust the tightness of the conveyor chain, and then begin to feed the dryer. Special: pay attention to the uniformity of the feeding end.
4. Open the steam supply globe valve and heat the drying chamber. When the steam working pressure is 0.4~ 1.0mpa, it can give full play to the excellent performance of the machine.
5. Control the humidity in the drying room by adjusting the Angle of inlet and outlet air valves, so as to achieve a good drying state of materials.
6. When the latter batch of materials leave the dryer, the steam supply globe valve can be closed, and then the fan can be closed later (the corresponding green light shows off).
7. When ^ the last batch of material hollow blade dryer, shut down the main drive (corresponding display green light off), then turn the speed regulating knob counterclockwise to zero, and the controller switch is placed in the "off" position (corresponding display red light off).
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Saturday, October 10, 2020
Ammonia decomposing furnace
Safety operation procedures for continuous bright annealing furnace of strip
steel in ammonia decomposition furnace
1、 The operator must go through
three-level safety education and pass the examination before taking the
post.
2、 Safety regulations for blowing in:
1. Routine inspection must be
carried out on the electrical appliances and machinery of ammonia calciner
before blowing in, and the electrical appliances and equipment must be in good
condition and grounded firmly;
2. Turn on the ammonia decomposition furnace
normally. To ensure the normal supply of gas.
3. When the temperature of
annealing furnace reaches 200 ℃, cooling water will be supplied;
4. When the
furnace temperature reaches 600 ℃, apply N2 and clean the furnace with N2.
5.
When the furnace temperature reaches 800 ℃, the oxygen content in the furnace is
less than 0. When it is 5%, the gas is decomposed by ammonia.
6. It is
strictly forbidden to pour the steel belt.
7. The H2 and N2 hoses must be
disassembled after each shutdown.
8. No fireworks are allowed in the
workplace.
3、 Safety regulations for boiler shutdown
1. Cut off the power
supply of each heating zone and cut off the power supply (100 ℃ / time). The
temperature of each area decreased evenly.
2. When the temperature of ammonia
decomposition furnace drops to 800 ℃, the ammonia decomposition gas is replaced
by nitrogen. After the fire of the front emptying pipe is extinguished, continue
to clean the furnace hall with small flow of nitrogen, and stop filling nitrogen
when it reaches 600 ℃.
3. Stop the fan when the temperature of ammonia
decomposition furnace drops to 300 ℃.
4. Stop water when the temperature of
ammonia decomposition furnace drops to 200 ℃.
5. After the annealing furnace
is finished, there should be a guide belt in the furnace for the next time.
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