Wave-transmitting material and wave-absorbing filler mass transfer separation tower

Abstract

The invention introduces a mass transfer separating tower of a wave-transmitting material and a wave-absorbing filler, the outer wall of the separating tower is made of the wave-transmitting material, the wave-absorbing material is arranged in the separating tower as the filler, and the periphery of the separating tower is provided with a high-frequency or medium-frequency electromagnetic wave generating device. The wave-transparent material is preferably a composite material prepared from high-temperature-resistant silicone rubber or polyimide resin and glass fiber prepreg, and the wave-absorbing filler is preferably silicon carbide particles. The wave-transparent material is excellent in electromagnetic wave performance, high in heat resistance and high in mechanical strength. According to the invention, the exchange efficiency of mass transfer and heat transfer can be improved, and compared with metal, the heat exchanger has better corrosion resistance and longer service life; the conductivity of the silicon carbide can be changed along with the change of temperature, and the silicon carbide is more suitable for mixed gas and liquid in a specific temperature range.

Description

Technical Field

[0001] The present invention relates to a separation tower, and particularly to a separation tower preheated by electromagnetic waves. Background Art

[0002] A wave-transparent material is a material that can transmit electromagnetic waves and hardly changes the properties (including energy) of the electromagnetic waves; a wave-transparent material is an insulating material with little loss and little distortion after passing through radio frequency electromagnetic waves. Its traditional main use is to manufacture various radomes to protect the antennas of radars and other electronic devices from the adverse effects of the external environment.

[0003] The outstanding advantages of silicone resins are good heat resistance and excellent dielectric properties, and their dielectric properties are relatively stable under various environmental conditions. Their disadvantages are low mechanical strength and the need for high-pressure molding.

[0004] Principle of electromagnetic induction heating: Electromagnetic induction heating generates induced current in a conductor through an alternating magnetic field, and these induced currents are converted into heat energy due to the resistance of the conductor itself, thereby achieving heating.

[0005] A so-called wave-absorbing material refers to a type of material that can absorb or significantly weaken the electromagnetic wave energy received on its surface, thereby reducing electromagnetic wave interference. In engineering applications, in addition to requiring the wave-absorbing material to have a high absorption rate of electromagnetic waves in a relatively wide frequency band, it is also required to have properties such as light weight, temperature resistance, humidity resistance, and corrosion resistance. With the development of modern science and technology, the impact of electromagnetic wave radiation on the environment is increasing day by day. At airports, flights are often delayed due to electromagnetic wave interference and cannot take off; in hospitals, electromagnetic waves generated by mobile devices often interfere with the normal operation of various electronic diagnostic instruments. Therefore, controlling electromagnetic pollution and finding a material that can resist and weaken electromagnetic wave radiation - a wave-absorbing material - has become a major topic in materials science.

[0006] Research has confirmed that ferrite wave-absorbing materials have the best absorption performance, and they have characteristics such as high absorption frequency band, high absorption rate, and thin matching thickness. Applying this material to electronic devices can absorb the leaked electromagnetic radiation and achieve the purpose of eliminating electromagnetic interference. However, ferrite has poor corrosion resistance and is difficult to be used in contact with chemical media.

[0007] Graphite, as a conductor, when placed in an alternating magnetic field, will generate an induced current inside it and then be converted into heat energy to achieve heating.

[0008] Generally, with the increase in temperature, the conductivity of silicon carbide will increase. This is because the increase in temperature will lead to an increase in the excitation and migration of carriers in silicon carbide, thereby increasing the conductivity. However, when the temperature further rises to a certain range, the conductivity of silicon carbide may show a saturation or decrease phenomenon, which is caused by other complex physical and chemical reactions occurring in the material at high temperatures. Summary of the Invention

[0009] Object of the Invention: Overcoming the disadvantages of low thermal efficiency, easy air leakage and electric leakage in the two indirect heating and heat transfer methods of steam coil heating and electric heating of traditional separation towers, a mass transfer separation tower for microwave-transparent materials and microwave-absorbing materials is provided, which can quickly heat, has high thermal efficiency and high safety.

[0010] Technical Solution: For the mass transfer separation tower of microwave-transparent materials and microwave-absorbing fillers of the present invention, the outer wall of the separation tower is made of microwave-transparent materials, and microwave-absorbing materials are provided inside as fillers. A high-frequency or medium-frequency electromagnetic wave generating device is arranged outside the separation tower.

[0011] On the separation tower, there is a liquid inlet above the filler, a gas inlet below the filler, a purified gas outlet at the top of the tower, and a mixed liquid outlet at the bottom of the tower.

[0012] Mass transfer separation process: After the liquid enters the tower from the liquid inlet and descends, the mixed gas enters the tower from the gas inlet and ascends. In the gaps of the filler, the liquid and the mixed gas conduct mass and heat contact exchange, so that the mixed gas is cooled and purified and then discharged from the top of the tower as purified gas. After the liquid absorbs soluble gas and heats up, it becomes a mixed solution and accumulates in the bottom space of the tower.

[0013] The microwave-transparent material is made of an insulating material that can transmit most electromagnetic waves. The microwave-transparent material is a non-conductive polymer material or composite material, preferably a composite material made of high-temperature-resistant silicone rubber or polyimide resin + glass fiber prepreg.

[0014] The filler is made of a conductive material that can absorb electromagnetic waves and has corrosion resistance and high temperature resistance, preferably graphite or silicon carbide fiber or particles with a larger specific surface area. Graphite, as a non-metallic mineral, has good electrical conductivity. This characteristic enables graphite to have a fast response ability in the electromagnetic field. Therefore, electromagnetic induction heating of graphite is an efficient and environmentally friendly heating method, which mainly uses the principle of electromagnetic induction to heat graphite.

[0015] The electromagnetic wave generating device outside the tower can generate high-frequency or medium-high-frequency electromagnetic waves (10K - 500KHz). After the filler absorbs the electromagnetic waves and generates heat, the liquid and the mixed gas passing through here are heated and warmed up.

[0016] Some of the acidic gases in the mixed gas are decomposed or separated. Small molecule inert gases are evaporated, and large molecule soluble gases are absorbed by the liquid (mainly solvents such as water), and then fall into the bottom space of the separation tower and are drained out. The bottom mixed solution outlet can be connected to a cooling tower. After recovery and separation treatment, it can be connected to a reflux pipe and then to the spraying device at the reflux port on the tower body above the packing to spray into the tower to assist the liquid in absorbing the mixed gas.

[0017] Above the spraying device, a demisting plate can be set to prevent liquid foam from blocking the purified gas outlet. Although the conductivity of graphite is higher than that of semiconductor silicon carbide, it is more beneficial for the absorption and temperature rise of electromagnetic waves. However, temperature is one of the important factors affecting the conductivity of silicon carbide. Generally, as the temperature rises, the conductivity of silicon carbide will increase. This is because the increase in temperature will lead to an increase in the excitation and migration of carriers in silicon carbide, thus increasing the conductivity. However, when the temperature further rises to a certain range, the conductivity of silicon carbide may show saturation or decline, which is caused by other complex physical and chemical reactions occurring in the material at high temperatures.

[0018] There are also a temperature sensor and a controller. The controller is connected to control the electromagnetic wave generator, and the temperature sensor is connected to measure the temperature of the packing, so as to realize the automatic detection and control of the operation process.

[0019] The heating duration of the electromagnetic wave and the temperature of the mixed gas (such as being suitable for high-temperature waste gases such as blast furnace tail gas or after heating for a period of time to increase the conductivity of silicon carbide by raising its temperature) can be combined to control the heating temperature of the silicon carbide particles in the internal packing to 220 - 270 °C. At this time, silicon carbide absorbs the electromagnetic wave to generate electromagnetic induction and heat, and its heating efficiency is similar to that of graphite. Moreover, small molecule hydrocarbons (such as methane, ethane, ethylene, propane, butane, etc.) in the mixed gas can be released from the purified gas outlet along with the inert gas and can be recycled in the later stage, making full use of resources and reducing environmental pollution emissions.

[0020] Beneficial effects: The present invention uses electromagnetic waves to heat the packing in the tower, with fast speed and high thermal efficiency. There is no need to use traditional steam heating, reducing the investment in heat exchange pipelines and reducing the phenomenon of leakage, and the production environment is better.

[0021] The wave-transparent material used is preferably a composite material made of high-temperature-resistant silicone rubber or a prepreg of polyimide resin + glass fiber, which has good electromagnetic wave transmission performance, good heat resistance, and high mechanical strength.

[0022] Using graphite or silicon carbide fillers (especially particles) can not only increase the exchange area of mass and heat transfer, but also have better corrosion resistance and longer service life than metals. In particular, silicon carbide has a conductivity that can change with temperature, is more suitable for use in a specific temperature range, has better corrosion resistance to chemical media, and has the advantages of higher hardness, strength, and chemical stability than graphite and lower cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic cross-sectional structure diagram of the present invention; In the figure, 1 - gas outlet; 2 - demisting plate; 3 - spraying device; 4 - liquid inlet; 5 - filler; 6 - gas inlet; 7 - liquid; 8 - liquid outlet; 10 - electromagnetic wave generating device. DETAILED DESCRIPTION OF THE INVENTION

[0024] Example 1: As Figure 1 shown in the mass transfer separation tower of the wave-transparent material and the wave-absorbing filler, there is a liquid inlet 4 above the filler 5 of the separation tower body, a gas inlet 6 below the filler 5, a purified gas outlet 1 at the top of the tower, and a mixed liquid outlet 8 at the bottom of the tower.

[0025] The separation tower has an outer wall of a wave-transparent material made of a silicone rubber + glass fiber composite material, an internally installed graphite fiber wave-absorbing filler 5, and an intermediate-frequency electromagnetic wave generating device is arranged outside the separation tower.

[0026] The wave-transparent material is a non-conductive polymer material or composite material that can transmit most electromagnetic waves; the filler 5 is made of a conductive material that can absorb electromagnetic waves, is corrosion-resistant, and has high temperature resistance.

[0027] Example 2: As Figure 1 shown in the mass transfer separation tower of the wave-transparent material and the wave-absorbing filler, there is a liquid inlet 4 above the filler 5 of the separation tower body, a gas inlet 6 below the filler 5, a purified gas outlet 1 at the top of the tower, and a mixed liquid outlet 8 at the bottom of the tower.

[0028] The separation tower has an outer wall of a wave-transparent material made of a polyimide resin + glass fiber composite material, an internally installed silicon carbide particle wave-absorbing filler 5, and a high-frequency electromagnetic wave generating device is arranged outside the separation tower. There is also a temperature sensor and a controller. The controller is connected to control the electromagnetic wave generator, and the temperature sensor is connected to measure the temperature of the filler 5.

[0029] Entering from the gas inlet 6 is the mixed waste gas of organic and inorganic gases, which contains hydrocarbon gases and acid anhydride acidic waste gases, as well as inert gases such as carbon dioxide and nitrogen. By controlling the heating duration of the electromagnetic wave, the temperature of the internal packing 5 silicon carbide particles is controlled to be heated to 220 - 270 °C. Methane and ethane in the mixed gas are released from the purified gas outlet 1 at the top of the tower and obtained for recycling (such as sent to a combustion furnace as fuel); part of the medium hydrocarbons decompose, and most of the heavy hydrocarbons are miscible in the mixed solution for later wastewater treatment and recycling.

Claims

1. A wave-transmitting material and wave-absorbing filler mass transfer separation tower, comprising a separation tower body, a liquid inlet (4) above the filler (5), a gas inlet (6) below the filler (5), a purified gas outlet (1) at the top of the tower, and a mixed liquid outlet (8) at the bottom of the tower; characterized in that: The mass transfer separation tower is made of an outer wall of a wave-transmitting material and a built-in wave-absorbing filler (5), and a high-frequency or medium-frequency electromagnetic wave generating device is arranged on the periphery of the separation tower; The wave-transmitting material is a non-conductive polymer material or composite material that can transmit most electromagnetic waves; the filler (5) is made of a conductive material that can absorb electromagnetic waves and is corrosion-resistant and high-temperature resistant.

2. The wave-transmitting material and wave-absorbing filler mass transfer separation tower according to claim 1, characterized in that: The wave-transmitting material is a composite material made of silicone rubber or polyimide resin + glass fiber prepreg.

3. The wave-transmitting material and wave-absorbing filler mass transfer separation tower according to claim 1, characterized in that: The wave absorbing filler (5) is graphite or silicon carbide.

4. The wave-transmitting material and wave-absorbing filler mass transfer separation tower according to claim 3, characterized in that: The wave-absorbing filler (5) is silicon carbide particles.

5. The wave-transmitting material and wave-absorbing filler mass transfer separation tower according to claim 3 or 4, characterized in that: There is also a temperature sensor and a controller, the controller is connected to control the electromagnetic wave generator, and the temperature sensor is connected to measure the temperature of the filler (5); By controlling the heating time of the electromagnetic wave generator, the heating temperature of the silicon carbide particles in the internal filler (5) is controlled to be 220-270°C.

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