The basics of electromagnetic induction heaters

Electromagnetic induction heater is a kind of heating equipment using electromagnetic induction principle, which is widely used in industrial heating, metal treatment, medical equipment disinfection, food processing and other fields. The following is an introduction to the basic knowledge of electromagnetic induction heaters:

1. working principle
The working principle of electromagnetic induction heaters is based on Faraday's law of electromagnetic induction. When an alternating current flows through the coil of the heater, a changing magnetic field is created around the coil. When a conductive material, such as a metal, is placed in this changing magnetic field, the change in the magnetic field creates eddy currents (i.e. closed current loops) inside the material. These eddies cause a heating effect on the electrical resistance of the metal, which heats up the metal.

2. Components
Electromagnetic induction heater is mainly composed of several parts:
1). Coil: usually made of copper or aluminum, used to generate a strong magnetic field.
2). Power supply: provides alternating current, and its frequency and intensity can be adjusted according to needs to adapt to different heating requirements.
3) Cooling system: Because coils and other components generate heat during heating, a cooling system (such as water cooling or air cooling) is needed to maintain the normal operation of the equipment.
4) Control system: used to adjust the power output, control the heating temperature and time, etc., to ensure the accuracy and repeatability of the heating process.

3: Advantage
1) High efficiency: electromagnetic induction heating efficiency is high, can quickly convert energy into heat.
2) Energy saving: Compared with traditional heating methods, electromagnetic induction heating can reduce energy consumption and operating costs.
3) Environmental protection: no need to burn fossil fuels, no emissions, more environmentally friendly.
4) Precise control: the temperature and position of the heating can be accurately controlled to improve product quality and consistency.
5) Safety: Because there is no open flame, it is safer to use, especially suitable for flammable and explosive environment.

#solid waste treatment

I)Asphalt for road construction
The oil residue after refining, also known as oil residue or asphalt, has huge economic value. Asphalt is a material commonly used in road construction that has good toughness and durability. In road construction, asphalt can be used as a pavement material that can withstand the weight and friction of vehicles while also resisting the erosion of wind, rain and ultraviolet rays. Asphalt can also be used for road repair and reinforcement to extend the service life of the road.

II)Water-proof materials
Bitumen is also widely used in the production of waterproofing materials. It has good waterproof performance and durability, which can effectively prevent moisture penetration and protect buildings from moisture and damage. Therefore, asphalt is widely used in waterproofing projects on roofs, basements, bathrooms and other places.

III)Paving materials
Asphalt can also be used as a paving material. It can be mixed with gravel, sand and other materials to make paving bricks, pavement markings and parking spaces. Not only are these materials highly wear-resistant and durable, they can also resist the weight and friction of vehicles while also improving the appearance and safety of the road surface.

IV)Industrial use
In addition to the above uses, asphalt can also be used for some industrial purposes. For example, it can be used as an additive in fuel oil to improve the combustion efficiency and calorific value of fuel oil; it can also be used to make coatings, paints and other materials; it can also be used as an additive in rubber products to improve the toughness and durability of rubber products.

Operation and maintenance of plate distillation tower

A.Operation requirements of plate tower equipment
Plate tower equipment is widely used in chemical production, and its operation process is introduced by taking the distillation tower of atmospheric and vacuum distillation unit, which is common in waste oil to diesel refining plant, as an example:

1. Check whether the valve of the rectification tower system is closed/opened correctly. Before distillation starts, open the cooling water circulation system, open the pressure relief valve, then open the condenser cooling water valve, adjust the water pressure to 0.15MPa, and close the feed rotameter valve.

2. Open the vacuum of the rectification tower system, the vacuum degree is selected according to the specific process requirements, such as the distillation material is volatile, open the brine unit, enable the condensation system, and capture the material.

3. Start the magnetic pump, send the distillation material into the metering tank, and then transport it to the high tank.

4. Open the preheating steam valve, open the tower tank steam valve, and control the steam pressure within the required range, maintain the set temperature.

5. Check whether the valve of the connecting pipe between the tower body, tower kettle and residual liquid tank is opened correctly.

6. Select the appropriate inlet of the tower, open the rotameter, and adjust the flow rate according to the specific situation.

7, the whole distillation process must be monitored vacuum, steam pressure, flow, material delivery and discharge conditions.

8.After distillation, drain and clean the system.

B.plate tower equipment shutdown maintenance

It is usually necessary to periodically shut down for maintenance, open the tower equipment, and overhaul its internal components. Note that when disassembling trays, each layer of trays should be marked so that errors may occur during reassembly. In addition, spare parts, such as seals, connectors, etc. are prepared in advance before the shutdown inspection to replace or supplement. The shutdown check items are as follows

1. Remove tray or packing, check and clean dirt or impurities.

2. Detect the thickness of the tower wall, make the thinning prediction curve, evaluate the corrosion situation, and judge the service life of the tower equipment; Check the tower body for leakage, and make repair arrangements for leakage.

3. Check the wear and tear of tray or packing.

4. Check whether the liquid level gauge, pressure gauge and safety valve are blocked and operate under the specified pressure, and readjust and correct if necessary.

5.If abnormal vibration is found during operation, the cause should be identified during shutdown inspection.

for more information about the device,we can have further discussion.

We can find that the sulfur content and aromatics content will reduce the quality of diesel oil, and the natural environment will be affected to a great extent. Therefore, at this stage, it is necessary to improve the quality of oil products and reduce their actual content, so as to effectively reduce environmental pollution and reduce harm to the human body.

Sulfur content
The element with the greatest environmental impact of diesel is sulfate, which is mainly composed of oxides emitted into the air combined with micro-particles. Diesel exhaust gas contains more than 40 kinds of harmful substances, of which 15 can be harmful to human health, and even carcinogenic. Low sulfur diesel and the use of converters can effectively reduce the emission of harmful substances. After the use of the converter, the sulfur content in diesel oil will be reduced to a certain extent. From 0.4% to 0.06%. The amount of particulate matter also decreased by 37 percent

Aromatics content
The content of polyaromatic hydrocarbons in diesel oil is high, and the value of cetane number is relatively lower, which is easy to produce nitric oxide and unburned hydrocarbons, thus increasing the overall content of PM in automobile exhaust. When the aromatics content was reduced from the original 41 percent to 21 percent, the nitric oxide content was also reduced by about 16 percent. In addition, when the PAHs were reduced from the original 7% to 2%, the particulate pollutants were also reduced by about 5%.
For the process waste oil to diesel re-refining plant,the sulfur content and aromatics content in the diesle meet the national standard request.

Important indicators to measure diesel’s quality | #waste oil recycling distillation equipment