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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