Vacuum System in Chongqing Iron and Steel Industry

In order to further improve product structure and steel quality in Chongqing Iron and Steel Industry, vacuum equipment technology is introduced. It is found that the vacuum system is greatly restricted by vapor from the current situation of domestic and foreign use. At the same time, in order to comply with the concept of environmental protection and efficient recovery and utilization of Chongqing Iron and Steel Industry, the vacuum system is chosen. When the limit pressure of the vacuum system reaches 67 Pa, the maximum pumping capacity can reach 800 kg/h, and the pressure in the vacuum tank can reach 67 Pa within 415 minutes of pumping time.

Vacuum system is used in the industry of Chongqing Iron and Steel Co., Ltd. Its metallurgical effect can reach or surpass the same technological target of multi-stage steam jet pump vacuum system. Its degassing rate is 63.5%, the ultimate decarbonization rate is 10@10-6, and T[O][30@10-6 in steel. Vacuum system is one of the necessary mechanical equipment of the elite equipment. Its extraction ability, extraction rate and other technological parameters directly affect the normal operation of RH and its metallurgical role. In the industry of Chongqing Iron and Steel Company, when the design of vacuum pump is 67Pa, the maximum pumping capacity is 800kg/h, which is basically the same as that of domestic steam pump with the same tonnage RH.


The vacuum system has the functions of degassing, decarbonization, temperature compensation, uniform temperature composition of molten steel and removal of inclusions in steel. It has been widely used in steelmaking because of its good refining effect and short treatment period.

XD-series-rotary-vane-vacuum-pump

2X-Series-Rotary-Vacuum-Pump

ZJP-Series-Roots-Vacuum-Pump

Reasons for Heating of Water Ring Vacuum Pump

1. The amount of circulating water is too little. There are two uses of circulating water. One is to cool the vacuum pump. The other is that water forms a water ring in the pump chamber when the impeller rotates. The air compresses the air in the water ring when the impeller rotates. 2. The temperature of the gas sucked by the vacuum pump is higher and the vacuum degree of circulating water is lower than 30 degrees. After running continuously for one day, the vacuum pump produces scale in the pump just like the kettle that boils water at home. When the impeller runs difficultly, the increase of friction causes the heat of the vacuum pump.

Exclusion methods:

1. The motor passport is dismantled. Whether the fan wings of the motor are flexible or not, there is no scale. When it is hard to operate, the exhaust pipe of the pump is dismantled and the scale inside is checked with the hand lamp. Scale will make the impeller difficult to operate, burn down the motor, and the spring of the mechanical seal will be easily locked on the shaft because of the scale. After the end surface is worn out, it can not be supplied automatically, resulting in leakage of the mechanical seal. Water burns down the motor.

2. Vacuum pump is a pumping pump, which permits a small amount of liquid. If the material sucked contains a large amount of water, buffer tank should be installed in front of the vacuum pump. If the vacuum pump sucks a large amount of water, it will break the impeller.

3. Vacuum pump sucks high gas temperature, using tap water as circulating water or using condenser to cool the gas. Attention: Vacuum pump must install overload protector to prevent overload burning motor. Connecting pipeline can not be thinned by 70%. Excessive thin pipeline and poor drainage can also cause overcurrent of motor.

ZJ-Series-Roots-Vacuum-Pumps

Diffusion-Pump-Vacuum-Unit

Water-Ring-Vacuum-Negative-Pressure-Station

2SK-Series-Two-stage-Water-Ring-Vacuum-Pump

Vacuum Pumps Types

If a container is placed in natural environment, if the gas pressure inside the container is not changed, the gas pressure inside and outside the container reaches equilibrium state, which is equal to atmospheric pressure numerically. In order to achieve a vacuum inside the container, the gas inside the container must be discharged, so that the pressure of the gas inside the container is less than the pressure of the external atmosphere. Using mechanical, physical, chemical or physical chemical methods, the equipment that obtains the vacuum from the gas discharged from the container is called the vacuum pump. Vacuum pumps can be classified into compression type (varistor type) and adsorption type according to their working principles. The working principle of the compressed vacuum pump is to compress the gas at the inlet end of the pump to the outlet end and discharge it out of the pump.

Common compression vacuum pumps are: rotating mechanical pumps using expansion-compression-discharge process, turbomolecular pumps using turbine blades to remove the body, etc. The working principle of the adsorption vacuum pump is to adsorb the gas in the pump body, which has achieved the goal of reducing the gas pressure. Common adsorptive vacuum pumps are: ion pumps using ionization suction, adsorption pumps using physical or chemical adsorption, suction pumps and cryogenic condensation pumps. The biggest difference between the adsorption vacuum pump and the compression vacuum pump is that the adsorption vacuum pump does not discharge the gas out of the pump, but stores it in the pump. The vacuum degree of the former is higher than that of the latter, but the pumping speed is smaller and the suitable container is smaller. Vacuum resistance furnace uses compressed vacuum pumps, such as mechanical pumps, Roots vacuum pumps and diffusion pumps.

Various types of vacuum pumps have their own working scope. Some pumps can work directly from the atmospheric state, such as mechanical pumps and adsorption pumps. Some pumps can not work directly from the atmospheric state, such as diffusion vacuum pumps, molecular pumps, ion pumps and so on. Only when the inlet vacuum reaches a certain value can they start to work.

oil-rotary/WX-series-oil-free-rotary-vane-vacuum-pump

2XZ-Series-Two-stage-High-Speed-Rotary-Vacuum-Pump

X-Series-Single-Stage-Rotary-Vacuum-Pump

Vacuum Pumps for Installation Requirements

The vacuum pump needs to be installed correctly before it runs. The location of the installation is more important. What kind of environment is it installed in? See the following details.

1. Vacuum pumps should be installed in dry, well ventilated and clean places.

2. It should be installed in a strong place on the ground. There should be sufficient room around it for inspection, maintenance and maintenance.

3. The foundation level should be maintained under the base of the vacuum pump. It is suggested to install cushion rubber or bolt at the four corners of the base to ensure the smooth operation and low vibration of the vacuum pump.

The installation position of the vacuum pump is determined, which is convenient for later operation and avoids the occurrence of faults in use. I hope today's knowledge will help you.

China-Turbomolecular-Pumps

2BEF3-Series-Water-Ring-Vacuum-Pump

2BEP-Series-Liquid-Ring-Compressor

2BV Water Ring Vacuum Pump of cavitation Phenomenon

When the vaporization pressure of 2BV water ring vacuum pump liquid is reduced to the vaporization pressure at a certain temperature, the liquid will produce bubbles. This phenomenon of bubble formation is called cavitation. When the bubbles generated by cavitation flow to the high pressure, their volume decreases to collapse. The phenomenon that bubbles disappear in liquids due to pressure rise is called cavitation collapse. This is also the problem of 2BV water ring vacuum pump in use. How to deal with this problem? The measures to prevent cavitation are as follows:

1. Reduce the height of geometric suction (or increase the height of geometric backfilling).

2. To reduce the inhalation loss hc, we can try to increase the pipe diameter and minimize the pipe length, elbows and accessories.

3. Prevent long-term operation under large flow.

4. Under the same speed and flow rate, the double suction pump is adopted, because the inlet flow rate is reduced and the cavitation of 2BV water ring vacuum pump is not easy to occur.

5. When cavitation occurs in the pump, the flow rate should be reduced or the speed should be reduced.

6. For pumps operating under harsh conditions, anti-cavitation materials can be used to avoid cavitation damage.

If cavitation occurs in the use of 2BV water ring vacuum pump, it will be destroyed, noise and vibration will also occur and the performance of the pump will be reduced. Seriously, the liquid in the pump will be interrupted and the pump will not work properly. Therefore, it is very important to prevent cavitation in 2BV water ring vacuum pump.

Liquid-Ring-Vacuum-Pump-with-Coal-Mine

liquid-ring-vacuum-pump-for-drying-process

liquid-ring-vacuum-pump-for-foam-forming

liquid ring vacuum pump of price

The liquid ring vacuum pump, know its friends should know that its use is very wide, then its price is affected by what factors? Next, let's follow us to understand the factors that affect the price of liquid ring vacuum pump.

1. Regionality. At present, most domestic products are facing the dilemma of having accessories without technology and without accessories. Because of the regional problems of raw materials, the prices of liquid ring vacuum pumps are uneven.

2. The material of the pump body can be divided into nodular cast iron and grey cast iron. Nodular graphite is obtained by spheroidizing and inoculation treatment, which effectively improves the mechanical properties of cast iron, especially the plasticity and toughness, thus obtaining higher strength than carbon steel. Ductile iron is a kind of high strength cast iron material developed in the 1950s. Its comprehensive properties are close to steel. It is precisely because of its excellent properties that it has been successfully used to cast some parts with complex stress, high strength, toughness and wear resistance.

3. Technical content of liquid ring vacuum pump. As we all know, the maturity of technology, the stability, reliability and life of products manufactured by high-standard processing and production equipment have an impact.

4. Quality of accessories. The liquid ring vacuum pump is mainly composed of several parts, such as filter, marble, exhaust hood, etc. The quality of these parts directly affects its price.

Piston-Vacuum-Pump-in-Wood-Impregnation

Vacuum-Pump-in-High-Strength-Metal-Manufacturing

vacuum-system-in-vacuum-smelting

Two-stage-Rotary-Vacuum-Pump-in-Fresh-keeping-of-Fruits

vacuum pump of workflow

Vacuum pump is an integral structure - a single-stage coaxial pump. The shaft seal adopts mechanical seal, which has the characteristics of simple structure, simple installation, oil-free, safe and reliable. Understanding vacuum pumps not only requires a general understanding of their performance, but also involves in the working process of vacuum pumps, compressors and gas-water separators. Let's take a look at its workflow.

The gas enters the Nasim vacuum pump through the pipeline through the valve, then enters the gas-water separator through the exhaust pipe, and discharges through the exhaust pipe of the gas-water separator. When used as a compressor, the gas-water mixture discharged by the compressor is separated in the gas-water separator, and the gas is conveyed to the system requiring compressed gas through the valve. The working water in the vacuum pump is discharged from the gas-water separator without cooling to the vacuum pump for reuse. The rest of the working water is supplemented by the water supply pipe. The size of the water supply is adjusted by the valve on the water supply pipe.

The difference between gas suction and pressure delivery systems is only that the internal structure of the gas-water separator is different. When sucking gas, the suction port pressure is lower than atmospheric pressure, while the exhaust port pressure is equal to atmospheric pressure, and the gas-water separator has overflow pipe; when pressurizing gas, the suction port is atmospheric pressure (or vacuum state), and the exhaust port pressure is higher than one atmospheric pressure. In order to ensure the transmission gas pressure, the water level of the gas-water separator is controlled by the overflow switch.

Above is the main working process of vacuum pump. Understanding this process can help us to effectively grasp every link of production in the production process, and also detect the occurrence of faults and errors in the production process in time.

Single-Stage-Water-Ring-Vacuum-Pump-for-Autoclave

Vertical-Claw-Four-Stage-Oil-Free-Dry-Vacuum-Pump

single-stage-rotary-vane-vacuum-pump-in-laboratory