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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Wednesday, September 30, 2020
Technical safety precautions of high frequency welder
(1) It should be noted that salt-salt-above a certain temperature will catch
fire and cause fire and explosion accidents, therefore, it is not allowed to
exceed the high frequency welding machine * high temperature.
(2) should be special note high frequency welding machine meaning saltpeter bath should not be mixed with charcoal, sawdust, oil, etc., in order to avoid saltpeter and carbon combined to form explosive substances caused by explosion.
(3) The workpieces and tools of high frequency welding machine must be dried before entering salt-salt-bath. It is strictly prohibited to bring water into salt-salt-bath, so as not to cause splashing of molten salt or injury caused by explosion.
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Monday, September 28, 2020
The forging furnace is easy to operate
There are many kinds of forging furnace. According to different power
sources, forging furnace can be divided into flame furnace and electric furnace.
According to the different fuels used, the flame furnace can be divided into oil
furnace, gas furnace and coal furnace, while the gas furnace can be divided into
natural gas forging furnace and gas heating furnace. According to the different
structure of heating chamber, it can be divided into chamber furnace (single
chamber furnace, double chamber furnace) semi-continuous furnace and continuous
furnace. According to the furnace bottom structure and mechanization form is
divided into trolley furnace and bottom furnace (also known as ring furnace).
Different furnace structure should be selected under different production
conditions, and chamber furnace should be selected as far as possible for small
batch production of single piece, trolley furnace should be used for large and
medium-sized forgings, and rotary bottom furnace should be used for small and
medium-sized forgings. The selection of furnace type must also consider the fuel
type, the quality and size of the heated billet, economic and labor conditions,
etc.
Reverberatory furnace
The reflector is a flame heating furnace using bituminous coal as fuel. The
reflector is mainly composed of combustor, heating chamber, air supply device,
heat exchanger and flue, chimney, etc.
Heavy oil and gas furnaces
The structure of gas and natural gas is basically the same. There is no
special combustion chamber, but the heavy oil or gaseous fuel and air are
injected directly into the heating chamber by the nozzle or burner (burner,
burner). But the burner is different, heavy oil burner, natural gas burner and
gas burner are not the same.
Gas forging furnace
Forging furnace is on the basis of the original coal furnace improved
equipped with gas from the gas generator for combustion heating furnace type,
generally choose according to forging furnace size configuration suitable
producer gas generator, the size of a small 1.3 configurations of ordinary small
producer gas generator, also have a large forging enterprise, with a gas
generator with many sets of forging furnace. Compared with the combustion
chamber of the original reverberatory furnace, the gas produced by the gas
generator is directly injected by the gas burner into the greenhouse with higher
efficiency than that of the reverberatory furnace and basically no emission
pollution.
Resistance furnace
It USES resistance generators to convert electrical energy into heat energy to heat the metal. It is mainly used for heating superalloys and non-ferrous metals and their alloys with strict temperature requirements.
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Sunday, September 27, 2020
Heat loss of trolley furnace
Different degrees of heat loss often occur in the process of practical application of electric furnace for trolley, which mainly manifests in the following aspects.
Exhaust heat loss: The heat taken away by the discharge of flue gas is called exhaust heat loss. This kind of heat loss can reach about 4%-8%, which is recognized as the biggest one in the heat loss of electric car furnace. The larger the volume of general smoke, the higher the exhaust temperature, the more heat loss.
Incomplete fuel combustion loss: The heat loss caused when fuel is burned in the furnace, usually some solid combustibles are excluded from the furnace without participating in combustion or without burning out. It includes the loss of coal leakage that part of the fuel is discharged into the ash bucket through the grate; The ash loss caused by the unburned combustibles wrapped in ash and discharged into ash bucket; Loss of fly ash from unburned carbon particles carried away by smoke. Among them, the heat lost by fly ash is the largest.
Heat loss: due to the metal structure of boiler unit, furnace wall flue are exposed to the atmosphere, they will be to the outside air to lose a certain amount of heat, this is the heat loss. Heat dissipation loss is usually directly related to the external area, heat preservation and thermal insulation of electric furnace unit.
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Friday, September 25, 2020
Reasonable operation is the key to prolong the service life of trolley furnace
Trolley furnace is really large energy consumption, with the electric furnace as an example, one is the trolley furnace device capacity. An ordinary RJX-30-9 box resistance furnace has a power of 30kW, while an ordinary C162 lathe has a capacity of only 7kW. Some large stoves can be installed with a capacity of hundreds of kilowatts, or even nearly a thousand kilowatts. Second, the working time of electric furnace is long. Generally speaking, the furnace from heating to heat preservation to continue the time, some open the furnace to continue to work for a few days, even as long as months to stop the furnace, and the general cold processing equipment work nature is completely different.
After the lining is knotted well, how to operate correctly and rationally is the key to prolong the service life of the trolley furnace and guarantee the life. - Generally speaking, check whether the water flow in the water cooling system is unobvious, whether the water pressure and temperature of cooling water are normal, whether there is leakage phenomenon, and whether the hydraulic system can work normally before operating the trolley furnace. The operation should be done, careful not to touch randomly, one person operation, one person monitoring, and strictly prohibit miscellaneous personnel into the machine room, prevent electric shock. The melting process to use the dry melting, and do light discharge, frequent feeding, when the melting furnace melt to reach the need should be poured out in time, to avoid high temperature increase lining loss; Frequent observation, when found that the outside of the furnace redness phenomenon, this is the precursor to the furnace leakage, should be promptly taken to shut down the intermediate frequency power supply, pour out of the furnace molten material and other measures, to avoid the occurrence of furnace leakage accident. In use should also pay attention to, when found that the furnace lining becomes very thin, can not continue to use, should break off the old lining to do a new lining, to prevent furnace leakage accident.
As a result of the diversity of hot processing materials and processing technology, as well as the different technical experience and operating habits, resulting in the furnace structure on the various. Therefore, in the trolley furnace non - standard equipment. In general machinery factory, trolley furnace non-standard equipment accounts for about 60%~70%.
In order to adapt to the development of production, the non-standard trolley furnace often needs to be modified, so it is difficult to establish the standard repair process. Non-standard trolley furnace with various components is not easy to achieve standardization, generalization and serialization, repair must be prepared before each, which increases the difficulty of repair work.
Trolley furnace, whether non-standard equipment or standard equipment, are on-site repair. The arrangement of time and space, the delivery of materials for repairing the furnace, the preparation of tools and appliances, the supply of energy such as water, electricity and compressed air, and the maintenance of sanitation on the site should be arranged comprehensively according to the production and site conditions. This puts forward higher request to the organization of repair work.
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Tuesday, September 22, 2020
Defects and countermeasures of carburizing parts in quenching furnace are common
The carburized layer presents large bulk or reticular carbides
Mesh belt furnace defects cause: high surface carbon concentration
1. Drip carburizing, drip too large
2. Control atmosphere carburizing, rich gas too much
3. Liquid carburizing, salt bath cyanide root content is too high
4. Carburizing and quenching furnace air cooling, cooling rate is too slow
Countermeasures:
1. Decrease the surface carbon concentration, reduce the amount of drops in the dispersion period and improve the humidity in the dispersion period, and also reduce the amount of drops in the carburization period
2. Carburizing agent to reduce solid carburizing
3. To reduce the content of cyanogen in liquid carburizing
4. Summer room temperature is too high, after infiltration air cooling parts can be blown cold
5. Improve the quenching heating temperature of 50~80 C and extend the heat preservation time appropriately
6. Two mesh belt type quenching furnace quenching or normalizing + quenching, but also normalizing + high temperature tempering, then quenching furnace tempering
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Friday, September 18, 2020
Check the preparation work of table furnace produced by electric furnace factory
Last we did a detailed introduction and explanation of the Danyang electric furnace. This article we simply to the electric furnace factory production table furnace preparation work inspection items to describe, as a professional manufacturer electric furnace factory co., LTD., will try our best to sort out and publish all kinds of related knowledge, wholeheartedly for your service.
Table furnace preparation inspection items produced by electric furnace factory:
1. Check whether the power supply of the equipment is normal, whether there is phase break, short circuit or bare wire, etc.
2. Check whether the connection of grounding device is in good condition.
3. Check whether there is any damage to the heating element, whether the contact of each connection is good, whether there is any contact with the trolley furnace body and housing.
4. Check the temperature control system for abnormal phenomena.
5. Check whether the lifting of the furnace door and the running of the trolley are normal.
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Thursday, September 17, 2020
Net belt blackening production line
Net belt blackening production line (absolutely environmentally friendly)
Normalizing furnace, net belt furnace type blackening furnace USES the workpiece to heat, reuses the environmental protection to send black liquid to soak and becomes. Completely different from the traditional sodium nitrite solid melting and blackening, it greatly improves the production efficiency, reduces the labor intensity and cost, improves the working environment of workers, and meets the requirements of high efficiency, energy saving and environmental protection.
It is applicable to the blackening process after pretreatment (no oil stains, no rust) of elastic strip, spring, hardware, standard parts, fasteners, bicycle parts and other metal parts, etc., and is suitable for mass production.
Process flow: manual feeding → cleaning machine → heating → blackening → drying → oiling → discharging
Maximum voltage: 380V Rated temperature: 350℃-400℃ Power: more than 11kW
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Wednesday, September 16, 2020
Measurement and control system of rotary furnace
As a large calcining equipment, the production process of the rotary furnace is relatively complex, so its production needs to be set up and monitored to test the running state. In order to help you better understand and use this equipment, this paper shares its measurement and control system with you.
1. Automatic control of temperature outside the roller
The temperature of
the rotary furnace is automatically controlled, and the system can realize the
automatic control of the temperature outside the drum. Furnace temperature can
be set below the rated temperature, temperature control accuracy is less than 2
degrees. By controlling the external temperature of the drum, the temperature of
the material in the drum can be controlled.
2. Exhaust outlet temperature
detection
A bimetal thermometer is installed on the vent at the upper end of
the air supply hood, mainly used to detect the temperature of the vent and
display it on site, so as to observe the temperature change.
3. Roller speed
regulation
The speed regulation of the drum is realized by the frequency
conversion speed regulation of the driving motor. The operation panel of the
inverter is installed on the panel of the control cabinet, which is convenient
for operation and helpful for the operation of the equipment.
4. Feeding
speed adjustment
Feeding speed is regulated by screw feed motor frequency
conversion. The inverter operation panel of the converter is installed on the
panel of the control cabinet for easy operation. Feeding speed should be decided
in the trial production stage, and gradually groped to increase, confirm the
appropriate feeding speed, not too fast.
5, dust removal fan frequency
adjustment
Dust removal fan adopts frequency conversion speed regulation,
flexible and convenient. The operation panel of inverter is installed on the
panel of control cabinet for easy operation.
Through the above introduction, it is not difficult to find the composition of the measurement and control system of the rotary furnace, their existence is an auxiliary role for the equipment, and easy to operate, it needs to pay attention to the standard operation, so as to help the long-term use of the equipment.
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Monday, September 14, 2020
Five main steps of gas nitriding furnace
Gas nitriding furnace has the characteristics of low temperature, short time, small deformation of the workpiece, properties: high fatigue limit and good wear resistance.
1. The gas nitriding furnace prior to nitriding must be a normalizing or tempering treatment of the workpiece.
2. First use gasoline and alcohol to scrub the surface of the workpiece in the gas nitriding furnace, not rust spots, oil stains, dirty presence.
3. After loading into the furnace, tighten the pressing bolts of the furnace cover symmetrically.
4. Circulate the cooling water through the inlet of the furnace tank and the furnace cover. The lower end of the cooling water in the pipeline on the cover of the gas nitrification furnace is inlet water, while the upper end is outlet water. Inlet water is fed into the furnace tank separately and discharged separately. All water pipes in the cover of the gas nitrification furnace can be connected in series according to the principle of low inlet and high, with one inlet and one outlet discharging.
5 gas nitriding furnace before the temperature should be sent to exhaust nitrogen, exhaust flow should be more than twice the use.
Exhaust after 10 minutes, to set the temperature control meter to 150 ℃, automatic heating switch to open, exhaust gas nitriding fireside and heated to 150 ℃ for 2 h and exhaust, and then to set the temperature control meter to 530 ℃, the ammonia flow down, maintain positive pressure in the furnace, vent has smaller flow upward pressure, when the temperature rises to 530 ℃, constant temperature constant current nitriding 3-20 h, then up the ammonia pressure, keeping the exhaust moderate pressure, nitriding 4-70 - h, then ammonia pressure down, back n 1 to 2 h, cut off power supply, give a small amount of ammonia, maintain positive pressure in the furnace, Ammonia supply can be stopped until the furnace temperature drops below 150℃.
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Wednesday, September 9, 2020
AC2000 air source processor oil water separator
Technical parameters:
1. Model: AC2000
2. Combination: AF2000 (air filter) +AL2000 (oil mist) +AR2000(pressure regulating valve)
3. Pipe diameter: G1/4
4. Working medium: air
5. Ensure pressure resistance: 1.5mpa
6. Ambient temperature: 5~60°C
7. Filter aperture: 40um
8. Recommended lubrication oil: Turbine No. 1 oil (IOS VG32)
9. Water filter glass capacity: 60CC
10. Feed glass capacity: 90CC
11. Weight: 0.75kg
12. Material of main accessories (body material: aluminum alloy, cup material: PC, protective cover: plastic)
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