Quench cooler electric decoking device and electric decoking process

Abstract

The invention relates to a quench cooler electric decoking device and an electric decoking process, and belongs to the field of petrochemical engineering, the quench cooler electric decoking device comprises a current conversion controller, an input electrode, an output electrode, an input detection electrode, an output detection electrode, a detector and a pulse power supply. The input electrode and the input detection electrode are connected to the inlet end of a furnace tube of the quench cooler, the output electrode and the output detection electrode are connected to the outlet end of the furnace tube of the quench cooler, and the detector is connected with the input detection electrode and the output detection electrode. The current conversion controller loads set voltage and current to the two ends of the quench cooler furnace tube through the input electrode and the output electrode, and an electromagnetic field is formed in the quench cooler furnace tube; the flow direction of the reaction material in the furnace tube of the quench cooler is the same as the flow direction of the current; and the input detection electrode and the output detection electrode are used for detecting voltages at two ends of the furnace tube of the quench cooler in real time. The method improves the decoking effect, is suitable for decoking and oxygen-containing flue gas purification at high temperature, and prolongs the operation cycle of the quench cooler.

Description

Technical Field

[0001] The invention belongs to the technical field of petrochemical industry, and in particular relates to an electric decoking device for a quench cooler and an electric decoking process. Background Art

[0002] During the ethylene production process, the high-temperature materials in the quench cooler tube of the ethylene unit drop from about 800℃ to 500℃. Some materials condense due to the sudden drop in temperature and adhere to the inner wall of the tube. As time goes by, the adhered materials gradually accumulate. The adhered materials contain a large amount of unsaturated olefins and other substances, which undergo polymerization reactions at high temperatures, resulting in poor material flow in the tube and increased pressure drop. If regeneration measures are not taken to clean it up, the quench cooler will eventually be completely blocked, causing unplanned shutdown of the quench cooler and even safety accidents. Once the quench cooler fails, it will seriously affect the normal operation of the ethylene unit and even shut down the unit. Therefore, it is very important to adopt a suitable regeneration and decoking process for the quench cooler for the stable operation of the ethylene unit.

[0003] At present, the traditional regenerative decoking processes used by various ethylene plants for quenchers are air coking and manual hydraulic coking. Generally, air coking and manual hydraulic coking are required when the quencher runs for two cycles. Therefore, a complete regenerative decoking cycle includes: 2 cycles of air coking + 1 manual hydraulic coking (2 cycles of liquid raw materials are about 90 days). Air coking is air + water vapor coking. The air and water vapor are heated to about 800°C and passed into the quencher tube. The hot air and water vapor react with the coke layer in the tube to gradually reduce it. Since the structure of the quencher at the rear end is different from the quencher furnace tube at the front end, the hot air and water vapor have a lower coking temperature after reaching the quencher, which is only about 500°C. It cannot reach the air coking temperature of about 800°C, and the coke layer cannot be effectively removed. Some substances that have not been removed and cannot react are still attached to the tube wall. Therefore, manual hydraulic coking must be performed after 2 cycles of air coking. Manual hydraulic decoking is a physical removal method that requires completely stopping the operation of the quench cooler, cooling the quench cooler to room temperature, and removing the quench cooler head. The quench cooler is decoked using physical methods such as mechanical rotors and high-pressure water. Since there are dozens or even hundreds of tubes inside the quench cooler, each tube needs to be cleaned, which is not only time-consuming and labor-intensive, but also prone to omissions. During the cleaning operation, the mechanical rotor and high-pressure water may damage the tube structure, causing the quench cooler to fail, which not only affects the normal production of the ethylene unit, but also increases the energy and material consumption of the ethylene unit, seriously affecting the economic benefits of ethylene production.

[0004] A Chinese patent with publication number CN102925196A discloses a device for preventing coking at the inlet of high-temperature cracking gas of an oil and gas quencher. In the device, a decoking steam ring is concentrically arranged at the oil and gas outlet of the air inlet pipe, and steam holes are arranged on the decoking steam ring to achieve decoking by steam. This patent can only solve the coking problem at the quenching inlet, and the inside of the quencher is still prone to coking, and the generated coke layer cannot be removed online. A Chinese patent with publication number CN107541238A discloses a thermal cracking simulation experimental device and a decoking method. In this patent, the circulating quenching recovery system involved mainly includes a cracking gas circulating quenching loop composed of a mixing quencher, an indirect quencher, a cyclone separator, a gas circulation pump and a cooler, wherein the quenching system injects quenching water into the coke layer in the quencher to remove the coke near the water injection pipe. The patented circulating quenching recovery system has a complex structure and an additional circulation system, which greatly increases the equipment investment cost and process complexity. It is not economical and can only remove coking near the water injection pipe but cannot solve the coking problem inside the quencher.

[0005] How to improve the process and technical indicators of the quench cooler without changing its main structure and increasing a small amount of equipment investment is a problem currently faced by most ethylene production units. The operation cycle of the quench cooler is directly related to the operation cycle of the cracking unit. The longer the operation cycle of the quench cooler, the fewer times the furnace will be shut down for burning, the longer the effective production time of the cracking unit, the lower the energy consumption per ton of ethylene, and the better the economic and technical performance of the unit. At a time when traditional energy is decreasing and carbon emissions are receiving more and more attention, quench coolers that have energy-saving effects and can reduce burning have important practical significance in saving energy consumption, reducing environmental pollution, and reducing production costs.

[0006] Electrostatic decoking is a new technology that has developed rapidly in recent years, involving the field of chemical reactions and separation. At present, electrostatic decoking is mainly used in the process of tail gas and air purification. Its working principle is that the electrostatic decoking device is a metal tube with a metal wire installed in the center. The metal tube is grounded as a precipitation electrode, and the metal wire is connected to high voltage electricity of more than 30kV as a discharge electrode. When the coal gas carries tar dust into the electric field caused by the above two electrodes, the tar dust has the same charge as the discharge electrode due to the charge released by the discharge electrode. On the one hand, this charged tar dust attracts other uncharged particles, combines with them to form larger particles, and finally falls from the airflow due to gravity; on the other hand, this charged tar dust moves to the precipitation electrode under the action of the electric field force, encounters the precipitation electrode and loses its charge and adheres to the inner wall of the metal tube of the precipitation electrode, and finally falls due to gravity or mechanical vibration. The falling tar dust is collected and discharged from the tar dust outlet. The electrostatic decoking device requires the construction of a complex high-voltage electric decoking tower, which is not suitable for ethylene cracking and coking operations containing oxygen and high temperature. Since electrostatic decoking requires the use of high voltage electricity of more than 30kV, a metal wire is installed in the center as a discharge electrode. Under the high-temperature cracking and coking operation of 500℃, the metal wire is unstable, and the high-voltage discharge can cause the coke and air in the quencher to explode, seriously threatening the safe operation of the device. In addition, the metal wire discharge electrode installed in the center cannot adapt to the high temperature of 500℃ and the high-speed airflow of 160m / s, and it will soon be damaged and fail. In addition, the cracking quencher is a closed system, and it is impossible to increase the discharge outlet of tar and dust. Therefore, there is no report on the use of the quencher for decoking.

[0007] For example, a Chinese patent with publication number CN209093613U discloses an electric decoking device, which requires the construction of a complex high-voltage electric decoking tower, including a decoking device body and a DC power supply. The inner cavity of the decoking device body is provided with a partition, and the inner cavity of the partition is evenly provided with air pipes, and the air pipes run through the top and bottom of the partition. The inner cavity of each group of air pipes is provided with a high-voltage electric field negative electrode wire, and the electric field negative electrode wire is connected to the negative electrode of the DC power supply to achieve the effect of gas impurity removal. This patent only adds a partition, which is essentially no different from ordinary electric decoking. High-voltage discharge cannot be used for decoking in a quench cooler, which may cause the coke and air in the quench cooler to explode, seriously threatening the safe operation of the device. In addition, the quench cooler is a closed system, and it is impossible to increase the outlet for tar and dust. In addition, the gas in the pipe flows at a high speed, reaching 80 meters / second. The falling tar dust cannot be collected and will be immediately carried away by the high-speed airflow, and the purpose of removal cannot be achieved. There is no report on its use for decoking in a quench cooler.

[0008] For example, the Chinese patent with the publication number CN2882795Y discloses a honeycomb type high-voltage electrostatic detarring dust collector, which requires a new complex high-voltage electric decoking tower, including a shell with a gas inlet, a gas outlet and a sewage outlet, and a high-voltage incoming line box, an intermittent flushing pipeline and an upper frame are respectively provided at the upper end of the shell. The upper frame is connected to the high-voltage DC generator through the high-voltage insulator in the high-voltage incoming line box, and a corona wire connected to the upper frame and the lower frame is provided in the hexagonal cylinder. The corona wire and the hexagonal cylinder jointly form a high-voltage DC strong electric field. This patent only divides the large cavity into small honeycomb cavities, which is essentially no different from ordinary electric decoking. High-voltage discharge cannot be used for decoking in quench coolers, which may cause explosions of coke and air in the quench cooler, seriously threatening the safe operation of the device, and the structure is complex. Since the quench cooler is a closed system, it is impossible to increase the outlet for tar and dust, and the gas in the tube flows at a high speed of 80 m / s. The falling tar dust cannot be collected and will be immediately carried away by the high-speed airflow, making it impossible to achieve the purpose of removal. There are no reports on its use for decoking in quench coolers.

[0009] In summary, there is an urgent need to develop a decoking device and process suitable for a quench cooler. Summary of the invention

[0010] In order to solve the problems of rapid coking of the quench cooler, short operation cycle of the quench cooler, short service life of the quench cooler tube, high energy consumption and low production efficiency in the ethylene production process, as well as the problems of the traditional electric decoking process such as the need to build a complex and expensive high-voltage electric decoking tower or cylinder, high-voltage discharge safety issues, inability to use at high temperatures, unsuitability for oxygen-containing flue gas purification and poor decoking effect, the present invention provides a quench cooler electric decoking device and an electric decoking process.

[0011] The technical solution adopted by the present invention to solve the technical problem is as follows:

[0012] The present invention provides a quencher electric decoking device, which mainly comprises:

[0013] Pulse power supply;

[0014] A current conversion controller connected to the pulse power supply;

[0015] An input electrode and an output electrode respectively connected to the current conversion controller; the input electrode is connected to the inlet end of the quench furnace tube, and the output electrode is connected to the outlet end of the quench furnace tube; the current conversion controller loads the set voltage and current to the two ends of the quench furnace tube through the input electrode and the output electrode to form an electromagnetic field in the quench furnace tube; the flow direction of the reaction material in the quench furnace tube is the same as the flow direction of the current;

[0016] An input detection electrode and an output detection electrode respectively connected to the quencher furnace tube; the input detection electrode is connected to the inlet end of the quencher furnace tube, and the output detection electrode is connected to the outlet end of the quencher furnace tube; the input detection electrode and the output detection electrode detect the voltage at both ends of the quencher furnace tube in real time;

[0017] A detector connected to the input detection electrode and the output detection electrode respectively.

[0018] Furthermore, the voltage range of the pulse power supply is 37V to 380V; the current range of the pulse power supply is 1mA to 10mA; and the frequency range of the direct current pulse current is 5Hz to 60Hz.

[0019] Furthermore, the input electrode, the output electrode, the input detection electrode and the output detection electrode are all made of nickel-based high-temperature alloy, titanium-based high-temperature alloy or molybdenum-based high-temperature alloy.

[0020] Furthermore, the input electrode, the output electrode, the input detection electrode and the output detection electrode are all provided with a cooling radiator.

[0021] Furthermore, the cooling radiator is an active heat dissipation structure or a passive heat dissipation structure; the active heat dissipation structure is an air-cooled heat dissipation structure or a water-cooled heat dissipation structure; the passive heat dissipation structure is a fin heat dissipation structure or a microchannel heat dissipation structure.

[0022] Furthermore, the cross-sections of the input electrode, output electrode, input detection electrode and output detection electrode are all circular, square, triangular or polygonal; the end faces of the input electrode, output electrode, input detection electrode and output detection electrode are all flat or curved.

[0023] Furthermore, the current output by the current conversion controller enters the quench cooler furnace tube through the input electrode, and flows out of the quench cooler furnace tube through the output electrode, forming a closed loop.

[0024] The present invention provides a quencher electric decoking process, which is implemented by using the quencher electric decoking device described above, and specifically comprises the following steps:

[0025] The reaction material containing tar and coke particles from the heat radiation furnace tube enters the quencher. The reaction material moves at high speed in the quencher furnace tube together with other gaseous hydrocarbon substances, so that the tar and coke particles are positively charged and other gaseous hydrocarbon substances are negatively charged. According to Coulomb's law of electromagnetism, there is an interaction force between different charges. The positively charged tar and coke particles are separated from the reaction material under the attraction of electrostatic force and adsorbed on the inner surface of the quencher furnace tube, and continue to gather; the electric decoking device is started, and current passes through the quencher furnace tube, and an electromagnetic field is formed on the surface of the quencher furnace tube; when the flow direction of the tar and coke particles in the quencher furnace tube is consistent with the direction of the electromagnetic field, the electromagnetic field will prevent the positively charged tar and coke particles from approaching the quencher furnace tube wall, slow down their aggregation on the quencher furnace tube wall, allow the tar and coke particles to pass through the quencher furnace tube as much as possible, reduce the aggregation time on the quencher furnace tube wall, and extend the quencher operation cycle.

[0026] The beneficial effects of the present invention are:

[0027] 1. Aiming at the problem that the traditional electric decoking process needs to build a complex and expensive high-voltage electric decoking tower or cylinder, the present invention does not need to add the high-voltage electric decoking tower or cylinder of the traditional electric decoking process, and only applies a pulse low-voltage electromagnetic field at both ends of the inlet and outlet of the quencher furnace tube. The standard of the low-voltage electricity is GB / T 12325-2008, the voltage is below 1000 volts, and an effective current is set. The voltage and current of the electromagnetic field are effectively controlled by the current conversion controller, so that a pulse electromagnetic field can be formed in the quencher furnace tube. When the flow direction of the tar and coke particles in the quencher furnace tube is consistent with the direction of the electromagnetic field, the tar and coke particles are more likely to pass through the quencher furnace tube under the action of the electromagnetic field instead of being adsorbed on the inner surface of the quencher furnace tube, thereby achieving the effect of slowing down the carbon deposition of the quencher furnace tube. The present invention does not need to add the high-voltage electric decoking tower or cylinder of the traditional electric decoking process, and reduces the cost of electric decoking. In addition, the present invention can reduce the coking of the quencher furnace tube by adding a small amount of equipment without changing the existing thermal cracking device, thereby improving the operation cycle and economic benefits of the quencher, and meeting the technical specifications of low-carbon green chemical industry.

[0028] 2. In view of the high-voltage discharge safety problem existing in the traditional electric decoking process, the present invention can adjust the working voltage and working current through the current conversion controller to adapt to the different stages of the operation of the quencher. In order to take into account the effect of electric decoking and the safety of operation, the voltage range of the pulse power supply is preferably 37V to 380V, the current range is preferably 1mA to 10mA, and the frequency range of the direct current pulse current is preferably 5Hz to 60Hz. At the same time, input detection electrodes and output detection electrodes are respectively connected to both ends of the quencher furnace tube. The voltage at both ends of the quencher furnace tube can be detected in real time through the input detection electrode and the output detection electrode. Once the voltage is too low or too high, an audible and visual alarm will appear. Therefore, the safety of the operation of the device is improved and the occurrence of high-voltage discharge safety problems is avoided.

[0029] 3. In view of the problem that the traditional electric decoking process cannot be used at high temperatures, the traditional electric decoking device is only suitable for low-temperature tail gas purification below 250°C, and its electrodes cannot operate under the high temperature condition of 500°C in the quencher. The quencher electric decoking device of the present invention has a wider applicable temperature range and is applicable to most high and low temperature environments, specifically to the temperature range of -100°C to 1300°C.

[0030] 4. In view of the problem that the traditional electric decoking process is not suitable for oxygen-containing flue gas purification, the traditional electric decoking device is a device that uses the Coulomb action principle of electric field to remove smoke, which is mainly composed of electrodes, collecting plates, high-voltage power supplies, control systems, etc. When the smoke passes through the electric field between the electrode and the collecting plate, the particles in the smoke will be affected by the electric field force, charged and deposited on the collecting plate, thereby achieving the purpose of removing smoke. Since the traditional electric decoking device uses high voltage electricity above 30kV, and there are conductive media such as water vapor in the quencher, it is easy to self-discharge inside the quencher furnace tube, which may cause combustion and explosion of combustibles in the quencher furnace tube, especially when there is a large amount of air during the charring process, which may cause serious safety problems. Even in the oxygen-free flue gas purification process, the oxygen content must be strictly detected to avoid safety accidents. At the same time, the electrode is prone to high-voltage discharge and damage under high voltage. The working principle of the present invention is different from the working principle and use conditions of the electric decoking of the cracking furnace thermal radiation. In the present invention, the electric decoking of the quencher furnace tube acts on a non-thermal reaction environment below 600°C, where there is no chemical reaction, only cooling of the high-temperature material, and recycling of heat energy to generate steam. The coking mechanism of the quencher is condensation coking, and the form of the coked material is liquid-solid mixed coke particles; at the same time, in the present invention, the electric decoking uses a direct current pulse current of more than 36V, which can produce an effect similar to that of impact rotation, and the decoking force it produces is stronger, and the direct current pulse current can produce a stronger electromagnetic disturbance, which prevents the liquid-solid mixed coke particles from approaching the tube wall of the quencher furnace tube. Therefore, the present invention is suitable for the purification of oxygen-containing flue gas.

[0031] 5. In view of the problem of poor decoking effect in traditional electric decoking processes, the present invention has verified through relevant comparative tests that a quencher electric decoking device and an electric decoking process provided by the present invention improve the decoking effect, and the decoking effect is better than that of the prior art.

[0032] 6. The electric decoking device and electric decoking process for a quench cooler provided by the present invention will not affect the yield and selectivity of the target product of the cracking product, while inhibiting the aggregation of coke particles in the quench cooler furnace tube, thereby improving the decoking effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The present invention provides a block diagram of the structure of a quencher electric decoking device.

[0034] In the figure, there are a current conversion controller 1, an input electrode 2, an output electrode 3, an input detection electrode 4, an output detection electrode 5, a detector 6, a pulse power supply 7, a quencher furnace tube 8, a tar coke particle mixture 9, and a reaction material 10. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0036] In a first aspect, the present invention provides a quench cooler electric decoking device.

[0037] like Figure 1 As shown, a quencher electric decoking device of the present invention has a unique structure and is a key device for realizing the thermal cracking electric decoking process. It mainly includes: a current conversion controller 1, an input electrode 2, an output electrode 3, an input detection electrode 4, an output detection electrode 5, a detector 6 and a pulse power supply 7.

[0038] The power supply of the electric decoking device of the quench cooler of the present invention should be low voltage electricity less than 1000V, and the standard is GB / T12325-2008. Pulse direct current means that the direction (positive and negative poles) remains unchanged, but the magnitude changes with time. For example, the typical pulse direct current is obtained by rectifying 50Hz alternating current through a diode, the pulse direct current of 50Hz is obtained by rectifying 50Hz alternating current through half-wave rectification, and the pulse direct current of 100Hz is obtained by rectifying 50Hz alternating current through full-wave or bridge rectification.

[0039] In the electric decoking device for a quench cooler of the present invention, the voltage range of the pulse power supply 7 can be a DC voltage of 37V to 1000V. The electric decoking device for a quench cooler of the present invention has an electric decoking effect at different voltages within the range of 37V to 1000V, but the electric decoking effects at different voltages are different, wherein the electric decoking effect is relatively better at a higher voltage. Therefore, for operational safety, the pulse power supply 7 is designed as a DC pulse current with a voltage less than 380V, and in order to take into account both the electric decoking effect and operational safety, the voltage range of the pulse power supply 7 is preferably 37V to 380V.

[0040] In a quencher electric decoking device of the present invention, the current range of the pulse power supply 7 can be a pulse direct current of 0.01mA to 10000mA. The quencher electric decoking device of the present invention has an electric decoking effect at different currents in the range of 0.01mA to 10000mA, but the electric decoking effects of different currents are different, and the electric decoking effect of a higher current is relatively better. Therefore, in order to comply with the national standard "Safety Current" and operational safety, the pulse power supply 7 is designed to be a direct current pulse current with a current less than 15mA, and in order to take into account both the effect of electric decoking and operational safety, the current range of the pulse power supply 7 is preferably 1mA to 10mA.

[0041] In the electric decoking device for a quench cooler of the present invention, the pulse power supply 7 uses a direct current pulse current, and the frequency range of the direct current pulse current can be 0.1 Hz to 1000 Hz. From the perspective of the electric decoking effect, the frequency range of the direct current pulse current is preferably 5 Hz to 60 Hz.

[0042] In the present invention, the pulse power supply 7 is connected to the current conversion controller 1, and the current conversion controller 1 is respectively connected to the input electrode 2 and the output electrode 3, and the input electrode 2 and the output electrode 3 are respectively connected to the quench furnace tube 8, and the input electrode 2 and the output electrode 3 are respectively located at the inlet and outlet ends of the quench furnace tube 8. The current conversion controller 1 loads the set voltage and current to the two ends of the quench furnace tube 8 through the input electrode 2 and the output electrode 3. After the electric decoking device is started, the current conversion controller 1 converts ordinary alternating current into pulse direct current, and the current output by the current conversion controller 1 enters the quench furnace tube 8 through the input electrode 2, and the quench furnace tube 8 has current passing through, forming an electromagnetic field in the quench furnace tube 8. After the current passes through the quench furnace tube 8, it flows out through the output electrode 3 or the ground wire to form a closed loop.

[0043] In the present invention, the input electrode 2 and the output electrode 3 are connected to the quencher furnace tube 8 by metal materials, wherein the connection method may be bolt connection, welding, etc., preferably, seamless connection is achieved by welding to prevent the loss of current energy.

[0044] In the present invention, the input electrode 2 and the output electrode 3 are both made of high temperature resistant materials and can withstand a high temperature of 800°C. The high temperature resistant material can be a nickel-based high temperature alloy, a titanium-based high temperature alloy, or a molybdenum-based high temperature alloy. In order to take into account both the high temperature resistant effect and the electrode design, the high temperature resistant material is preferably a titanium-based high temperature alloy, which has good corrosion resistance, oxidation resistance, heat resistance, acid and alkali resistance and other properties.

[0045] In the present invention, cooling radiators are provided on both the input electrode 2 and the output electrode 3. The cooling radiator can increase the heat dissipation area and optimize the heat conduction path, improve the heat dissipation effect, and reduce the high temperature of about 500°C of the quencher furnace tube 8 to the tolerance temperature of the electrode cable.

[0046] In the present invention, the cooling radiator can be an active heat dissipation structure or a passive heat dissipation structure, preferably a passive heat dissipation structure. The active heat dissipation structure can be an air-cooled heat dissipation structure or a water-cooled heat dissipation structure, preferably an air-cooled heat dissipation structure; the passive heat dissipation structure can be a fin heat dissipation structure or a microchannel heat dissipation structure, preferably a fin heat dissipation structure.

[0047] In the present invention, the cross-sections of the input electrode 2 and the output electrode 3 may be circular, square, triangular or any polygonal; the end faces of the input electrode 2 and the output electrode 3 may be flat or curved.

[0048] In the present invention, the structures of the input electrode 2 and the output electrode 3 are preferably cylindrical structures.

[0049] In the present invention, the input detection electrode 4 and the output detection electrode 5 are respectively connected to the quench furnace tube 8, and the input detection electrode 4 and the output detection electrode 5 are respectively located at the inlet and outlet ends of the quench furnace tube 8, and the input detection electrode 4 and the output detection electrode 5 are both connected to the detector 6. After the electric decoking device is started, the current output by the current conversion controller 1 enters the quench furnace tube 8 through the input electrode 2, and the current passes through the quench furnace tube 8, forming an electromagnetic field in the quench furnace tube 8. After the current passes through the quench furnace tube 8, it flows out through the output electrode 3 or the ground wire to form a closed loop. At the same time, the input detection electrode 4 and the output detection electrode 5 are respectively connected at both ends of the quench furnace tube 8. The detector 6 can detect the voltage of the input detection electrode 4 and the output detection electrode 5 in real time, that is, the voltage at both ends of the quench furnace tube 8 in real time. Once the voltage is too low or too high, the detector 6 will have an audible and visual alarm.

[0050] In the present invention, the input detection electrode 4 and the output detection electrode 5 are connected to the quencher furnace tube 8 by metal materials. The connection method can be bolt connection, welding, etc., preferably seamless connection is achieved by welding to prevent attenuation of the detection signal.

[0051] In the present invention, the input detection electrode 4 and the output detection electrode 5 are both made of high temperature resistant materials and can withstand a high temperature of 800°C. The high temperature resistant material can be a nickel-based high temperature alloy, a titanium-based high temperature alloy, or a molybdenum-based high temperature alloy. In order to take into account both the high temperature resistant effect and the electrode design, the high temperature resistant material is preferably a titanium-based high temperature alloy, which has good corrosion resistance, oxidation resistance, heat resistance, acid and alkali resistance and other properties.

[0052] In the present invention, cooling radiators are provided on both the input detection electrode 4 and the output detection electrode 5. The cooling radiator can increase the heat dissipation area and optimize the heat conduction path, improve the heat dissipation effect, and reduce the high temperature of about 800°C of the quencher furnace tube 8 to the tolerance temperature of the detection cable.

[0053] In the present invention, the cooling radiator can be an active heat dissipation structure or a passive heat dissipation structure, preferably a passive heat dissipation structure. The active heat dissipation structure can be an air-cooled heat dissipation structure or a water-cooled heat dissipation structure, preferably an air-cooled heat dissipation structure; the passive heat dissipation structure can be a fin heat dissipation structure or a microchannel heat dissipation structure, preferably a fin heat dissipation structure.

[0054] In the present invention, the cross-sections of the input detection electrode 4 and the output detection electrode 5 may be circular, square, triangular or any polygonal; the end faces of the input detection electrode 4 and the output detection electrode 5 may be flat or curved.

[0055] In the present invention, the structure of the input detection electrode 4 and the output detection electrode 5 is preferably a cylindrical structure.

[0056] The electric decoking device for a quench cooler of the present invention can be arranged inside an explosion-proof control cabinet to improve operation safety.

[0057] The electric decoking device for a quench cooler of the present invention has an operating power of 0.1W to 1000kW, preferably 100W to 10kW.

[0058] The electric decoking device for a quench cooler of the present invention has an operating voltage of 37V to 1000V, wherein the operating voltage is preferably 37V to 380V.

[0059] The electric decoking device for a quench cooler of the present invention has an operating current of 0.01 mA to 10000 mA, wherein the operating current is preferably 1 mA to 10 mA.

[0060] The electric decoking device for a quench cooler of the present invention can adjust the working voltage through the current conversion controller 1 to adapt to different stages of the operation of the quench cooler. For example, at the initial stage of the operation of the quench cooler, the surface of the quench cooler furnace tube 8 is relatively clean, and the working voltage can be relatively low, and the preferred working voltage range is 37V to 220V; while at the end of the operation of the quench cooler, the surface of the quench cooler furnace tube 8 is covered with a coke layer, and the working voltage should be increased, and the preferred working voltage range is 220V to 380V.

[0061] The electric decoking device for a quench cooler of the present invention can adjust the working current through the current conversion controller 1 to adapt to different stages of the operation of the quench cooler. For example, at the initial stage of the operation of the quench cooler, the surface of the quench cooler furnace tube 8 is relatively clean, and the working current can be relatively low, and the preferred working current range is 1mA to 5mA; while at the end of the operation of the quench cooler, the surface of the quench cooler furnace tube 8 is covered with a coke layer, and the working current should be increased, and the preferred working current range is 5mA to 10mA.

[0062] For reliable and stable decoking devices suitable for industrial use, the maximum output power can only reach about 20 kilowatts. In actual applications, the rated power that can operate stably for a long period is only about 10 kilowatts. In order to enhance the decoking effect, multiple groups of electric decoking devices of the present invention can be set up to work in parallel to obtain a better decoking effect.

[0063] The quench cooler electric decoking device of the present invention solves many problems existing in traditional electric decoking devices, such as the need to build a complex and expensive high-voltage electric decoking tower or cylinder, high-voltage discharge safety issues, inability to use at high temperatures, and unsuitability for oxygen-containing flue gas purification.

[0064] In addition, the electric decoking device for a quench cooler of the present invention also solves the high-temperature decoking problem existing in conventional electric decoking devices. Conventional electric decoking devices are only suitable for low-temperature tail gas purification below 250°C, and their electrodes cannot operate under the high temperature condition of 500°C in the quench cooler. The electric decoking device for a quench cooler of the present invention has a wider applicable temperature range and is applicable to most high-temperature and low-temperature environments, specifically to a temperature range of -100°C to 1300°C.

[0065] In a second aspect, the present invention provides a quench cooler electric decoking process, which is mainly implemented by using a quench cooler electric decoking device provided in the first aspect.

[0066] The specific implementation process of the quench cooler electric decoking process of the present invention is as follows:

[0067] The cracked gas containing tar and coke particles at about 800°C from the thermal radiation furnace tube enters the quencher. The reaction material 10 containing tar and coke particles moves at a high speed of 80 to 120 m / s in the quencher furnace tube 8 together with other gaseous hydrocarbon substances. Since the mass of tar and coke particles is greater than that of other gaseous hydrocarbon substances, their moving speed is also lower than that of other gaseous hydrocarbon substances. Due to this speed difference, other gaseous hydrocarbon substances continuously scour and rub the coke particles. In this process, friction generates static electricity, which causes the tar and coke particles to be positively charged and other gaseous hydrocarbon substances to be negatively charged. Since the quencher furnace tube 8 is made of metal, grounding measures are generally adopted. According to the Coulomb law of electromagnetism, there is an interaction force between different charges. The positively charged tar and coke particles are easily separated from the reaction material 10 under the attractive force of the electrostatic force, adsorbed on the inner surface of the quencher furnace tube 8, and continuously aggregated to form a tar-coke particle mixture 9, thereby blocking the quencher furnace tube 8. When the electric decoking device for a quencher of the present invention is started, current flows through the quencher furnace tube 8, and an electromagnetic field is formed on the surface of the quencher furnace tube 8. When the magnetic field lines of the electromagnetic field reach a suitable direction and intensity, the electromagnetic field will prevent the positively charged tar and coke particles from approaching the tube wall of the quencher furnace tube 8, thereby achieving the purpose of slowing down their accumulation on the tube wall of the quencher furnace tube 8, allowing them to pass through the quencher furnace tube 8 as much as possible, reducing their accumulation time on the tube wall of the quencher furnace tube 8, and extending the operation cycle of the quencher.

[0068] According to Ampere's law of electromagnetism, in any section of a conductor, the magnitude and direction of the current determine the magnitude and direction of the magnetic field generated. This law explains that the essence of the current is a moving charge and generates a magnetic field. When a quencher electric decoking device of the present invention is started, the current output by the current conversion controller 1 enters the quencher furnace tube 8 through the input electrode 2. After the current passes through the quencher furnace tube 8, it flows out through the output electrode 3 or the ground wire to form a closed loop.

[0069] Among them, when the flow direction of the reaction material 10 in the quencher furnace tube 8 is consistent with the current flow direction of the electric decoking, that is, the current output by the current conversion controller 1 enters through the input electrode 2 and flows out from the output electrode 3 or flows out from the ground wire, and at the same time, the reaction material 10 enters the quencher furnace tube 8 through the input electrode 2 end and flows out of the quencher furnace tube 8 from the output electrode 3 end. At this time, the coke particles generate repulsive force due to the electromagnetic field effect of the tube wall of the quencher furnace tube 8, and are not easily adsorbed on the tube wall of the quencher furnace tube 8, and pass through the quencher furnace tube 8, thereby greatly reducing the amount of coking and achieving the purpose of extending the operation cycle of the quencher.

[0070] When the flow direction of the reaction material 10 in the quencher furnace tube 8 is inconsistent with the current flow direction of the electric decoking, that is, the current output by the current conversion controller 1 enters through the input electrode 2 and flows out from the output electrode 3 or from the ground wire, and at the same time, the reaction material 10 enters the quencher furnace tube 8 through the output electrode 3 end and flows out of the quencher furnace tube 8 from the input electrode 2 end, at this time, the coke particles generate a deflection force due to the electromagnetic field effect of the tube wall of the quencher furnace tube 8. In the process of moving forward, the coke particles are prone to radial movement and deflect toward the direction of the tube wall of the quencher furnace tube 8. They are easily adsorbed on the tube wall of the quencher furnace tube 8, which greatly increases the amount of coking, resulting in the operation cycle of the quencher being shorter than the operation cycle under normal conditions.

[0071] The electric decoking process of a quench cooler of the present invention has a different working principle and use conditions from the electric decoking of the thermal radiation of the cracking furnace. First, the electric decoking of the thermal radiation furnace tube of the cracking furnace acts on a thermal reaction environment above 1000°C, and the cracking coking mechanism of thermal radiation is free radical coking, that is, the coking matrix such as polycyclic aromatic hydrocarbons in the high-temperature gas continues to dehydrogenate into coke particles, and the coke product is in the form of solid coke particles. The outside of the thermal radiation furnace tube of the cracking furnace is a furnace flame of 1100°C, and the safety requirements are relatively high. According to the safety design specifications of the cracking furnace, a DC stable current of 36V or less should be used; while the electric decoking of the quench cooler furnace tube 8 acts on a non-thermal reaction environment below 600°C, where there is no chemical reaction, and only the high-temperature material is cooled, and heat energy is recovered to generate steam. The coking mechanism of the quench cooler is condensation coking, and the coke product is in the form of liquid-solid mixed coke particles. Second, the electric decoking of thermal radiation from the cracking furnace uses a DC stable current of 36V or less due to the high safety requirements, while the quencher has no thermal reaction and the temperature is low, and the electric decoking uses a DC pulse current of more than 36V. The voltage and current forms of the two are different. The DC stable current of 36V or less has a better removal effect on solid coke particles, but a poor removal effect on liquid-solid mixed coke particles, because the liquid-solid mixed coke particles have stronger adhesion, and a higher voltage and pulse current electric decoking process is required. Compared with ordinary DC and pulse-free DC, DC pulse current can produce an effect similar to impact rotation, and the decoking force it produces is stronger, and DC pulse current can produce stronger electromagnetic disturbances, which prevents liquid-solid mixed coke particles from approaching the wall of the quencher furnace tube 8. Therefore, the decoking effect of pulsed DC is better than that of ordinary DC and pulse-free DC.

[0072] In a quencher electric decoking process of the present invention, it is not necessary to add a high-voltage electric decoking tower of the traditional electric decoking process. A pulsed low-voltage electromagnetic field is applied at both ends of the inlet and outlet of the quencher furnace tube 8. The standard of the low-voltage electricity is GB / T12325-2008, the voltage is below 1000V, and an effective current is set. By effectively controlling the voltage and current of the electromagnetic field, a pulsed electromagnetic field can be formed in the quencher furnace tube 8. When the flow direction of the tar and coke particles in the quencher furnace tube 8 is consistent with the direction of the electromagnetic field, the tar and coke particles are more likely to pass through the quencher furnace tube 8 under the action of the electromagnetic field, rather than being adsorbed on the inner surface of the quencher furnace tube 8, so as to achieve the effect of slowing down the carbon deposition of the quencher furnace tube 8. Therefore, a quencher electric decoking process of the present invention solves many problems existing in the traditional electric decoking process, such as the need to build a new complex and expensive high-voltage electric decoking tower or cylinder, the safety problem of high-voltage discharge, the inability to use at high temperature, and the inability to be suitable for oxygen-containing flue gas purification.

[0073] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0074] Example 1

[0075] 1. Carry out a blank test;

[0076] Without starting the electric decoking device, a blank test was conducted on a simulated cracking pilot plant with a feed rate of 5 kg per hour. Before the thermal cracking reaction, the quencher furnace tube 8 was removed and weighed separately, and the weight M1 obtained was the empty tube weight of the quencher furnace tube 8 (2520.00 g).

[0077] Install the quencher furnace tube 8, select naphtha as the cracking raw material, set the cracking temperature to 820°C, the cracking pressure to 0.18MPa, and the cracking dilution ratio to 0.5. After other process parameters reach the set values, feed the naphtha raw material. After the quencher has been running stably for 6 hours, stop feeding the naphtha raw material, purge and dry the quencher furnace tube 8, remove the quencher furnace tube 8 and weigh it, and obtain the weight M2, which is the sum of the empty tube weight and the blank coking amount (2521.50 grams). The weight M2 minus the weight M1 is the blank coking amount (1.50 grams).

[0078] 2. Conduct pulse decoking test;

[0079] Then, a pulse decoking test was carried out on a simulated cracking pilot plant with a feed rate of 5 kg per hour. The cracking raw material was selected as naphtha, the cracking temperature was set to 820°C, the cracking pressure was 0.18MPa, and the cracking dilution ratio was 0.5. After other process parameters reached the set values, the naphtha raw material was introduced. The voltage and current output by the current conversion controller 1 were set to 48V and 5mA respectively, and the pulse current frequency was 50Hz. The electric decoking device of the present invention was started, that is, the current output by the current conversion controller 1 entered the quencher furnace tube 8 through the input electrode 2. After the current passed through the quencher furnace tube 8, it flowed out through the output electrode 3 or the ground wire to form a closed loop. There is current passing through the quencher furnace tube 8, and an electromagnetic field is formed on the surface of the quencher furnace tube 8. The electromagnetic field will prevent the positively charged coke particles from approaching the wall of the quencher furnace tube 8, thereby achieving the purpose of slowing down the aggregation of coke particles on the wall of the quencher furnace tube 8, allowing the coke particles to pass through the quencher furnace tube 8 as much as possible, reducing their coking on the wall of the quencher furnace tube 8, and achieving the purpose of extending the operation cycle of the quencher. After the quencher has been running for 6 hours, the introduction of naphtha raw material is stopped, the quencher furnace tube 8 is purged and dried, and the quencher furnace tube 8 is removed and weighed. The weight M3 is the sum of the empty tube weight and the electric decoking amount (2520.50 grams). The weight M3 minus the weight M1 is the electric decoking amount compared to the coking amount (0.50 grams), which is 1.00 grams less than the blank coking amount (1.50 grams), and the reduction ratio is 66.67%, and the decoking effect is obvious.

[0080] Example 2 Pulse decoking test with reverse current

[0081] A pulse decoking test was conducted on a simulated cracking pilot plant with a feed rate of 5 kg per hour. Naphtha was selected as the cracking raw material, the cracking temperature was set to 820°C, the cracking pressure was 0.18 MPa, and the cracking dilution ratio was 0.5. After other process parameters reached the set values, the naphtha raw material was introduced. The voltage and current output by the current conversion controller 1 were set to 48V and 5mA respectively, and the pulse current frequency was 50Hz. The electric decoking device of the present invention was started, that is, the current output by the current conversion controller 1 entered the quencher furnace tube 8 through the input electrode 2. After the current passed through the quencher furnace tube 8, it flowed out through the output electrode 3 or the ground wire to form a closed loop. At the same time, the reaction material 10 entered the quencher furnace tube 8 through the output electrode 3 end and flowed out of the quencher furnace tube 8 from the input electrode 2 end. After the quencher has been running stably for 6 hours, the introduction of naphtha raw material is stopped, the quencher furnace tube 8 is purged and dried, and then the quencher furnace tube 8 is removed and weighed. The weight M4 is the sum of the empty tube weight and the electric decoking amount (2522.80 grams). The weight M4 minus the weight M1 is the electric decoking amount compared to the coking amount (2.80 grams), which is 1.30 grams higher than the blank coking amount (1.50 grams), with an increase rate of 86.67%. Not only is there no decoking effect, but the coking amount is significantly increased.

[0082] Example 3 Pulse decoking test at different voltages

[0083] A pulse decoking test was conducted on a simulated cracking pilot plant with a feed rate of 5 kg per hour. Naphtha was selected as the cracking raw material, the cracking temperature was set to 820°C, the cracking pressure was 0.18 MPa, and the cracking dilution ratio was 0.5. After other process parameters reached the set values, the naphtha raw material was introduced. The voltage and current output by the current conversion controller 1 were set to 72V and 5mA respectively, and the pulse current frequency was 50Hz. The electric decoking device of the present invention was started, that is, the current output by the current conversion controller 1 entered the quencher furnace tube 8 through the input electrode 2. After the current passed through the quencher furnace tube 8, it flowed out through the output electrode 3 or the ground wire to form a closed loop. At the same time, the reaction material 10 entered the quencher furnace tube 8 through the input electrode 2 end and flowed out of the quencher furnace tube 8 from the output electrode 3 end. After the quencher has been running stably for 6 hours, the introduction of naphtha raw material is stopped, the quencher furnace tube 8 is purged and dried, and then the quencher furnace tube 8 is removed and weighed. The weight M5 is the sum of the empty tube weight and the electric decoking amount (2520.45 grams). The weight M5 minus the weight M1 is the electric decoking amount compared to the coking amount (0.45 grams), which is 1.05 grams less than the blank coking amount (1.50 grams), and the reduction rate is 70.00%. Compared with the decoking voltage of 48V, the decoking effect of the decoking voltage of 72V is further improved.

[0084] Example 4 Pulse decoking test with different currents

[0085] A pulse decoking test was conducted on a simulated cracking pilot plant with a feed rate of 5 kg per hour. Naphtha was selected as the cracking raw material, the cracking temperature was set to 820°C, the cracking pressure was 0.18 MPa, and the cracking dilution ratio was 0.5. After other process parameters reached the set values, the naphtha raw material was introduced. The voltage and current output by the current conversion controller 1 were set to 48V and 10mA respectively, and the pulse current frequency was 50Hz. The electric decoking device of the present invention was started, that is, the current output by the current conversion controller 1 entered the quencher furnace tube 8 through the input electrode 2. After the current passed through the quencher furnace tube 8, it flowed out through the output electrode 3 or the ground wire to form a closed loop. At the same time, the reaction material 10 entered the quencher furnace tube 8 through the input electrode 2 end and flowed out of the quencher furnace tube 8 from the output electrode 3 end. After the quencher has been running stably for 6 hours, the supply of naphtha raw material is stopped, the quencher furnace tube 8 is purged and dried, and then the quencher furnace tube 8 is removed and weighed. The weight M6 is the sum of the empty tube weight and the electric decoking amount (2520.35 grams). The weight M6 minus the weight M1 is the electric decoking amount compared to the coking amount (0.35 grams), which is 1.15 grams less than the blank coking amount (1.50 grams), and the reduction rate is 76.67%. Compared with the decoking current of 5mA, the decoking effect of the decoking current of 10mA is further improved.

[0086] Example 5 Pulse decoking test with different frequencies

[0087] A pulse decoking test was conducted on a simulated cracking pilot plant with a feed rate of 5 kg per hour. Naphtha was selected as the cracking raw material, the cracking temperature was set to 820°C, the cracking pressure was 0.18 MPa, and the cracking dilution ratio was 0.5. After other process parameters reached the set values, the naphtha raw material was introduced. The voltage and current output by the current conversion controller 1 were set to 48V and 5mA respectively, and the pulse current frequency was 100Hz. The electric decoking device of the present invention was started, that is, the current output by the current conversion controller 1 entered the quencher furnace tube 8 through the input electrode 2. After the current passed through the quencher furnace tube 8, it flowed out through the output electrode 3 or the ground wire to form a closed loop. At the same time, the reaction material 10 entered the quencher furnace tube 8 through the input electrode 2 end and flowed out of the quencher furnace tube 8 from the output electrode 3 end. After the quencher has been running stably for 6 hours, the introduction of naphtha raw material is stopped, the quencher furnace tube 8 is purged and dried, and then the quencher furnace tube 8 is removed and weighed. The weight M7 is the sum of the empty tube weight and the electric decoking amount (2520.65 grams). The weight M7 minus the weight M1 is the electric decoking amount compared to the coking amount (0.65 grams), which is 0.85 grams less than the blank coking amount (1.50 grams), and the reduction rate is 50.00%. Compared with the decoking frequency of 50 Hz, the decoking effect of the decoking frequency of 100 Hz is significantly reduced. This is related to the fact that the higher the frequency of the pulse current, the closer its current characteristics are to the pulse-free current.

[0088] Example 6 Pulseless decoking test

[0089] A decoking test was conducted on a simulated cracking pilot plant with a feed rate of 5 kg per hour. Naphtha was selected as the cracking raw material, the cracking temperature was set to 820°C, the cracking pressure was 0.18 MPa, and the cracking dilution ratio was 0.5. After other process parameters reached the set values, the naphtha raw material was introduced. The voltage and current output by the current conversion controller 1 were set to 48V and 5mA respectively, and the current was a pulse-free direct current. The electric decoking device of the present invention was started, that is, the current output by the current conversion controller 1 entered the quencher furnace tube 8 through the input electrode 2. After the current passed through the quencher furnace tube 8, it flowed out through the output electrode 3 or the ground wire to form a closed loop. At the same time, the reaction material 10 entered the quencher furnace tube 8 through the input electrode 2 end and flowed out of the quencher furnace tube 8 from the output electrode 3 end. After the quencher has been running stably for 6 hours, the introduction of naphtha raw material is stopped, the quencher furnace tube 8 is purged and dried, and then the quencher furnace tube 8 is removed and weighed. The weight M8 is the sum of the empty tube weight and the electric decoking amount (2521.05 grams). The weight M8 minus the weight M1 is the electric decoking amount compared to the coking amount (1.05 grams), which is 0.45 grams less than the blank coking amount (1.50 grams), with a reduction rate of 30.00%. Compared with the pulsed direct current of 48V and 5mA, the decoking effect of no pulsed direct current is significantly reduced.

[0090] Example 7 Decoking Test Using Alternating Current

[0091] A decoking test was conducted on a simulated cracking pilot plant with a feed rate of 5 kg per hour. Naphtha was selected as the cracking raw material, the cracking temperature was set to 820°C, the cracking pressure was 0.18 MPa, and the cracking dilution ratio was 0.5. After other process parameters reached the set values, the naphtha raw material was introduced. The voltage and current output by the current conversion controller 1 were set to 48V and 10mA respectively, and the current was 50Hz AC. The electric decoking device of the present invention was started, that is, the current output by the current conversion controller 1 entered the quencher furnace tube 8 through the input electrode 2. After the current passed through the quencher furnace tube 8, it flowed out through the output electrode 3 or the ground wire to form a closed loop. At the same time, the reaction material 10 entered the quencher furnace tube 8 through the input electrode 2 end and flowed out of the quencher furnace tube 8 from the output electrode 3 end. After the quencher has been running stably for 6 hours, the introduction of naphtha raw material is stopped, the quencher furnace tube 8 is purged and dried, and the quencher furnace tube 8 is removed for weighing, and the weight M9 is the sum of the empty tube weight and the electric decoking amount (2521.48 grams). The weight M9 minus the weight M1 is the electric decoking amount compared to the coking amount (1.48 grams), which is 0.02 grams less than the blank coking amount (1.50 grams), which is equivalent to the blank coking amount, and there is basically no decoking effect. This shows that the decoking effect of the forward current offsets the negative effect of the reverse current on coking, which is equivalent to no decoking effect.

[0092] Example 8 Decoking Comparison Test of Pyrolysis Product Yield

[0093] In order to investigate whether the electric decoking device of the present invention has an impact on the yield of cracking products while suppressing coke, a decoking test was carried out on a simulated cracking pilot plant with a feed rate of 5 kg per hour. The cracking raw material was selected as naphtha, the cracking temperature was set to 820°C, the cracking pressure was 0.18MPa, and the cracking dilution ratio was 0.5. After other process parameters reached the set values, the naphtha raw material was introduced. The voltage and current output by the current conversion controller 1 were set to 48V and 5mA respectively, and the pulse current frequency was 50Hz. The electric decoking device of the present invention was started, that is, the current output by the current conversion controller 1 entered the quencher furnace tube 8 through the input electrode 2. After the current passed through the quencher furnace tube 8, it flowed out through the output electrode 3 or the ground wire to form a closed loop. At the same time, the reaction material 10 entered the quencher furnace tube 8 through the input electrode 2 end and flowed out of the quencher furnace tube 8 from the output electrode 3 end. After the quencher has been running stably for 3 hours, the introduction of naphtha feedstock is stopped, and the cracking products are collected at the outlet of the quencher furnace tube 8 for chromatographic analysis to obtain comparative data on the cracking product yields of the loaded electric decoking and blank, as shown in Table 1.

[0094] Table 1 Mass yield of pyrolysis products of electrocoking and blank

[0095]

[0096]

[0097] As can be seen from Table 1, the yields of pyrolysis products in the blank group and the electric decoking group are very close, which indicates that the electric decoking device of the present invention has little effect on the yield of pyrolysis products.

[0098] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A quench cooler electric decoking device, characterized in that: include: Pulse power supply; A current conversion controller connected to the pulse power supply; An input electrode and an output electrode respectively connected to the current conversion controller; The input electrode is connected to the inlet end of the quencher furnace tube, and the output electrode is connected to the outlet end of the quencher furnace tube; The current conversion controller loads the set voltage and current to both ends of the quencher furnace tube through the input electrode and the output electrode to form an electromagnetic field in the quencher furnace tube; the flow direction of the reaction material in the quencher furnace tube is the same as the flow direction of the current; An input detection electrode and an output detection electrode respectively connected to the quencher furnace tube; the input detection electrode is connected to the inlet end of the quencher furnace tube, and the output detection electrode is connected to the outlet end of the quencher furnace tube; the input detection electrode and the output detection electrode detect the voltage at both ends of the quencher furnace tube in real time; A detector connected to the input detection electrode and the output detection electrode respectively.

2. The electric decoking device for a quench cooler according to claim 1, characterized in that: The voltage range of the pulse power supply is 37V to 380V; the current range of the pulse power supply is 1mA to 10mA; and the frequency range of the direct current pulse current is 5Hz to 60Hz.

3. The electric decoking device for a quench cooler according to claim 1, characterized in that: The input electrode, the output electrode, the input detection electrode and the output detection electrode are all made of nickel-based high-temperature alloy, titanium-based high-temperature alloy or molybdenum-based high-temperature alloy.

4. The electric decoking device for a quench cooler according to claim 1, characterized in that: The input electrode, the output electrode, the input detection electrode and the output detection electrode are all provided with cooling radiators.

5. The electric decoking device for a quench cooler according to claim 4, characterized in that: The cooling radiator is an active heat dissipation structure or a passive heat dissipation structure; the active heat dissipation structure is an air-cooled heat dissipation structure or a water-cooled heat dissipation structure; the passive heat dissipation structure is a fin heat dissipation structure or a microchannel heat dissipation structure.

6. The electric decoking device for a quench cooler according to claim 1, characterized in that: The cross sections of the input electrode, output electrode, input detection electrode and output detection electrode are all circular, square, triangular or polygonal; the end faces of the input electrode, output electrode, input detection electrode and output detection electrode are all flat or curved.

7. The electric decoking device for a quench cooler according to claim 1, characterized in that: The current output by the current conversion controller enters the quench cooler furnace tube through the input electrode, and flows out of the quench cooler furnace tube through the output electrode, forming a closed loop.

8. A quench cooler electric decoking process, characterized in that: The method is implemented by using a quench cooler electric decoking device as claimed in any one of claims 1 to 7, comprising the following steps: The reaction material containing tar and coke particles from the heat radiation furnace tube enters the quencher. The reaction material moves at high speed in the quencher furnace tube together with other gaseous hydrocarbon substances, so that the tar and coke particles are positively charged and other gaseous hydrocarbon substances are negatively charged. According to the Coulomb's law of electromagnetism, there is an interaction force between different charges. The positively charged tar and coke particles are separated from the reaction material under the attraction of electrostatic force and adsorbed on the inner surface of the quencher furnace tube, and continue to gather; the electric decoking device is started, and current passes through the quencher furnace tube, and an electromagnetic field is formed on the surface of the quencher furnace tube; when the flow direction of the tar and coke particles in the quencher furnace tube is consistent with the direction of the electromagnetic field, the electromagnetic field will prevent the positively charged tar and coke particles from approaching the quencher furnace tube wall, slowing down their aggregation on the quencher furnace tube wall, allowing the tar and The coke particles pass through the quench cooler tube as much as possible, reducing the time they accumulate on the quench cooler tube wall. Extend the quench cooler operating cycle.

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