Semi-coke wastewater electric heating purification device

Abstract

The utility model discloses an electric heating purification device for semi-coke wastewater, and relates to the technical field of special equipment for the semi-coke industry. The semi-coke wastewater electric heating purification device comprises a feeder, an electric heating rotary furnace, an electric heating vertical furnace, an air preheater, an induced draft fan and a blow-down pipe. The purification device simulates a volcano model, through heat compensation and oxygen compensation, semi-coke wastewater decomposition and oxidation, solid-phase residual micro vitrification and residual sufficient purification are completed in a red hot molten state and then discharged into the atmosphere, water in the purified semi-coke wastewater is discharged in a gas state cleanly and enters the atmosphere to supplement humidity, and the purification device is beneficial to ecological improvement.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the special equipment technical field of semi coke industry, and particularly relates to a semi coke wastewater electrothermal purification device. BACKGROUND

[0002] Semi coke wastewater, also known as semi coke wastewater, is a kind of industrial wastewater formed in the process of low metamorphic coal (non-sticky coal, weakly sticky coal, long flame coal) in low temperature dry distillation (about 600-800 DEG C) and in the process of coal gas purification and semi coke steam quenching. The composition of this wastewater is complex, containing a large amount of refractory, high toxicity pollutants such as benzene series, phenols, polycyclic aromatic hydrocarbons, nitrogen oxygen heterocyclic compounds and inorganic pollutants such as heavy metals, which is a typical high pollution, high toxicity industrial wastewater.

[0003] The conventional treatment is ammonia evaporation phenol extraction process, biochemical degradation, desalination and purification. The disadvantages are complex equipment, high energy consumption and low recovery value. Acid and alkali corrosion equipment is obvious and produces mixed salt solid waste. Phenols are highly toxic and can interfere with biochemical degradation, making the effluent quality unstable. UTILITY MODEL CONTENT

[0004] In order to solve the above problems existing in the prior art, the utility model provides a semi coke wastewater electrothermal purification device. The technical problem to be solved by the utility model is solved by the following technical scheme:

[0005] The utility model provides a semi coke wastewater electrothermal purification device, which comprises a feeder, an electric heating rotary furnace, an electric heating vertical furnace, an air preheater, an induced draft fan and a venting pipe, wherein,

[0006] The feeder is provided with a first feeding port, a second feeding port and a discharge port, wherein the solid auxiliary material enters the feeder through the first feeding port, and the semi coke wastewater enters the feeder through the second feeding port;

[0007] The electric heating rotary furnace is inclinedly arranged, one end in high position is provided with a high position gas outlet and a mixing inlet, and the other end in low position is provided with a low position gas inlet and a residue outlet, and the mixing inlet is connected with the discharge port of the feeder;

[0008] The top of the electric heating vertical furnace is provided with a first gas inlet and a second gas inlet, the sidewall close to the bottom is provided with a gas outlet, the first gas inlet is connected with the high position gas outlet of the electric heating rotary furnace, and the gas outlet is connected with the gas inlet at the bottom of the air preheater;

[0009] An air inlet, a first preheated air outlet, and a second preheated air outlet are provided on the side wall of the air preheater, and a purified air outlet is provided on the top. The air inlet is used to introduce air into the air preheater. The first preheated air outlet is connected to the low-position air inlet of the electric rotary furnace, the second preheated air outlet is connected to the second air inlet of the electric vertical furnace, and the purified air outlet is connected to the air inlet of the induced draft fan.

[0010] The air outlet of the induced draft fan is connected to the air inlet at the bottom of the vent pipe, and the vent pipe is used to discharge the purified gas.

[0011] In one embodiment of the present invention, the feeder includes a bracket, a horizontal screw propeller, a silo and a feed pipe, wherein:

[0012] The silo and the feeding pipe are installed on the bracket, the silo is located above the feeding pipe, the silo is used to hold the solid auxiliary material, and the bottom of the silo is connected to the first feeding port;

[0013] The horizontal screw propeller is installed at the first end of the feed pipe, and the propulsion rod of the horizontal screw propeller is located inside the feed pipe;

[0014] The first feed port and the second feed port are arranged on the side wall of the feed pipe, the discharge port is arranged at the second end of the feed pipe, and the second feed port is located on a side close to the discharge port.

[0015] In one embodiment of the present invention, the mass ratio of the solid auxiliary material in the mixture of the solid auxiliary material and the semi-coke wastewater is not less than 1%.

[0016] In one embodiment of the present invention, the solid auxiliary material includes quicklime powder and waste to be processed, the mass ratio of the quicklime powder in the solid auxiliary material is not less than 50%, and the waste to be processed includes coke powder or activated sludge.

[0017] In one embodiment of the present invention, the operating temperature of the electric heating rotary furnace is 800°C-900°C.

[0018] In one embodiment of the present invention, the electric vertical furnace includes an external shell and a heat storage body located inside the external shell, an electric heating wire heating plate is arranged above the heat storage body, an air intake duct is arranged on the top of the external shell, and the first air inlet and the second air inlet are arranged on the side wall of the air intake duct; a maintenance furnace door is provided on the side wall of the external shell near the top, and a ash cleaning furnace door is provided on the side wall of the external shell near the bottom.

[0019] In one embodiment of the present invention, the operating temperature of the electric vertical furnace is 900°C-1000°C.

[0020] In one embodiment of the present invention, the air preheater includes two fan-shaped heat exchangers arranged in series from bottom to top, the air inlet is arranged on the side wall of the fan-shaped heat exchanger, the first preheated air outlet is arranged on the side wall of the lower fan-shaped heat exchanger near the bottom, and the second preheated air outlet is arranged on the side wall of the upper fan-shaped heat exchanger near the top.

[0021] In one embodiment of the present invention, the temperature of the purified air discharged from the purified air outlet of the air preheater is 120°C-200°C.

[0022] In one embodiment of the present invention, the vent pipe is a chimney with insulation, the height of the vent pipe is not less than 15 meters, and an oxygen content analyzer and a thermometer are provided inside the vent pipe.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] The utility model discloses an electrothermal purification device for semi-coke wastewater, which utilizes an electric rotary furnace and an electric vertical furnace to thoroughly purify the semi-coke wastewater into solid-phase residue, water vapor and a small amount of carbon dioxide through thermal decomposition and catalytic oxidation; solid-phase auxiliary materials are melted with sulfur and metal elements in the semi-coke wastewater to form slag, thereby forming a micro-vitrified residue to remove harmful substances such as sulfur; the water in the purified semi-coke wastewater is discharged in a clean gaseous state and enters the atmosphere to replenish humidity, which is beneficial to improving the ecology.

[0025] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In addition, in order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic structural diagram of a semi-coal wastewater electrothermal purification device provided by an embodiment of the present utility model;

[0027] Figure 2 It is a structural schematic diagram of an electric heating vertical furnace provided by an embodiment of the utility model.

[0028] Icons: 1-feeder; 2-electric rotary furnace; 3-electric vertical furnace; 4-air preheater; 5-induced draft fan; 6-vent pipe; 11-bracket; 12-horizontal screw propeller; 13-silo; 14-feed pipe; 31-external shell; 32-heat storage body; 33-electric heating wire heating plate; 34-air intake pipe; 35-maintenance furnace door; 36-ash cleaning furnace door; 41-fan-shaped heat exchanger. DETAILED DESCRIPTION

[0029] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the following is a detailed description of a semi-coal wastewater electrothermal purification device proposed in accordance with the utility model in combination with the accompanying drawings and specific implementation methods.

[0030] The aforementioned and other technical contents, features, and effects of the present invention are clearly presented in the following detailed description of the specific embodiments in conjunction with the accompanying drawings. Through the description of the specific embodiments, a more in-depth and specific understanding of the technical means and effects adopted by the present invention to achieve the intended purpose can be obtained. However, the accompanying drawings are for reference and illustration purposes only and are not intended to limit the technical solutions of the present invention.

[0031] The present invention provides a device for electrothermal purification of semi-coal wastewater. Figure 1 , Figure 1 This is a schematic diagram of the structure of a semi-coal wastewater electrothermal purification device provided by the embodiment of the utility model. Figure 1 As shown, the electrothermal purification device for semi-coke wastewater of this embodiment includes: a feeder 1, an electric rotary furnace 2, an electric vertical furnace 3, an air preheater 4, an induced draft fan 5 and a vent pipe 6.

[0032] Among them, the feeder 1 is provided with a first feed port, a second feed port and a discharge port, the solid auxiliary material enters the feeder 1 through the first feed port, and the semi-coke wastewater enters the feeder 1 through the second feed port; the electric heating rotary furnace 2 is tilted, and a high-position air outlet and a mixing inlet are provided at the high end, and a low-position air inlet and a residue outlet are provided at the low end, and the mixing inlet is connected to the discharge port of the feeder 1; the top of the electric heating vertical furnace 3 is provided with a first air inlet and a second air inlet, and an air outlet is provided on the side wall near the bottom, and the first air inlet is connected to the high-position air outlet of the electric heating rotary furnace 2 The air inlet is connected to the air preheater 4, and the air outlet is connected to the air inlet at the bottom of the air preheater 4; an air inlet, a first preheated air outlet and a second preheated air outlet are provided on the side wall of the air preheater 4, and a purified air outlet is provided on the top. The air inlet is used to introduce air into the air preheater 4, the first preheated air outlet is connected to the low-position air inlet of the electric rotary furnace 2, the second preheated air outlet is connected to the second air inlet of the electric vertical furnace 3, and the purified air outlet is connected to the air inlet of the induced draft fan 5; the air outlet of the induced draft fan 5 is connected to the air inlet at the bottom of the vent pipe 6, and the vent pipe 6 is used to discharge the purified air.

[0033] In this embodiment, solid auxiliary materials and semi-coal wastewater are mixed through feeder 1 and then enter electric rotary furnace 2. Air preheater 4 then feeds hot air into electric rotary furnace 2, filling it with a sufficient amount of oxidizing gas and creating an oxidizing atmosphere. The mixed solid auxiliary materials and semi-coal wastewater undergo preliminary and thorough thermal decomposition under the high temperature and oxidizing atmosphere. The resulting solid phase material melts and forms slag, which is then discharged through the residue outlet. The resulting mixed gas enters electric vertical furnace 3. Air preheater 4 then feeds hot air into electric vertical furnace 3, further increasing the oxygen content and promoting catalytic oxidation, resulting in complete gasification of the mixed gas. The resulting residue is deposited at the bottom of electric vertical furnace 3 and is periodically cleaned by staff. The resulting purified gas is then heat exchanged through air preheater 4 and discharged through induced draft fan 5 into vent pipe 6. It is maintained above 110°C and discharged at high altitude, where it enters the atmosphere and increases humidity. A small amount of solid particles carried along with the airflow in the purified gas act as condensation nuclei for water vapor, combining with fine dust in the atmosphere, resulting in a micro-white cloud phenomenon.

[0034] The electrothermal purification device for lignite wastewater in this embodiment completes the decomposition and oxidation of lignite wastewater in a red-hot molten state by supplementing heat and oxygen, and the solid phase residue is micro-vitrified. The rest is discharged into the atmosphere after being fully purified. The water in the purified lignite wastewater is discharged in a clean gaseous state and enters the atmosphere to replenish humidity, which is beneficial to improving the ecology.

[0035] In an optional embodiment, the feeder 1 comprises a support 11, a horizontal screw propeller 12, a bin 13 and a feeding pipe 14. Among them, the bin 13 and the feeding pipe 14 are installed on the support 11, the bin 13 is located above the feeding pipe 14, the bin 13 is used to contain solid auxiliary materials, the bottom of the bin 13 is connected with the first feeding port; the horizontal screw propeller 12 is installed at the first end of the feeding pipe 14, the propeller rod of the horizontal screw propeller 12 is located inside the feeding pipe 14; the first feeding port and the second feeding port are arranged on the side wall of the feeding pipe 14, and the discharge port is arranged at the second end of the feeding pipe 14, and the second feeding port is located on the side close to the discharge port.

[0036] Optionally, the second feeding port can be a liquid flange inlet, and the semi-coked waste water enters the feeding pipe 14 through the liquid flange inlet via the pipeline, and the flow of the semi-coked waste water can be controlled by adjusting the liquid flange inlet.

[0037] In this embodiment, the solid auxiliary materials enter the feeding pipe 14 through the first feeding port via the bin 13, the solid auxiliary materials entering the feeding pipe 14 are spirally propelled by the propeller rod of the horizontal screw propeller 12, and after being fully mixed with the semi-coked waste water, they enter the electric heating rotary furnace 2 through the discharge port, wherein the solid auxiliary materials play a sealing and air leakage prevention role for the horizontal screw propeller 12.

[0038] Optionally, the mass ratio of the solid auxiliary materials in the mixture of the solid auxiliary materials and the semi-coked waste water is not less than 1%. The solid auxiliary materials include lime powder and waste to be treated, wherein the mass ratio of the lime powder in the solid auxiliary materials is not less than 50%, and the waste to be treated can be coke powder or activated sludge.

[0039] In this embodiment, the lime powder can react with harmful elements such as sulfur and chlorine in the semi-coked waste water to ensure the removal of harmful elements in the semi-coked waste water.

[0040] In an optional embodiment, the electric heating rotary furnace 2 comprises a rotary drum and a rotary kiln located inside the rotary drum. The rotary drum is made of nickel-based alloy, and the working temperature can reach 1100℃. Different diameters and lengths of the rotary drum can be manufactured according to the target material processing capacity. Multiple independent heating zones can be designed in the rotary kiln according to production requirements. High-quality silicon carbide (SiC) heating elements can be used for electric heaters, which have long service life and are easy to maintain. The temperature control of the electric heating rotary furnace 2 can be realized through a high-precision PID intelligent heat controller. The rotary kiln rotates through a rotating drum, and the rotating speed of the rotating drum can be controlled by a variable frequency speed regulation motor, which is convenient for controlling the rotating speed. The rotating drum can be tilted through hydraulic pressure, which is convenient for controlling the movement and unloading of materials.

[0041] In this embodiment, the working temperature of the electric heating rotary furnace 2 is 800℃-900℃.

[0042] Please refer to Figure 2, Figure 2 This is a schematic diagram of the structure of an electric heating vertical furnace provided by an embodiment of the present utility model; Figure 2 As shown, in an optional embodiment, the electric vertical furnace 3 includes an outer shell 31 and a heat storage body 32 located inside the outer shell 31, an electric heating wire heating plate 33 is arranged above the heat storage body 32, an air intake duct 34 is arranged on the top of the outer shell 31, and the first air inlet and the second air inlet are arranged on the side wall of the air intake duct 34; a maintenance furnace door 35 is provided on the side wall of the outer shell 31 near the top, and a ash cleaning furnace door 36 is provided on the side wall of the outer shell 31 near the bottom.

[0043] In this embodiment, the first air inlet is connected to the high-position air outlet of the electric heating rotary furnace 2 through a mixed gas pipeline.

[0044] Optionally, the heat storage body 32 can be built with refractory bricks. The heat storage body 32 is built in a hollow grid shape to ensure shockproof stability, freedom of expansion and contraction, good air flow and interface catalysis. The inner wall is built with a fireproof layer and the operating temperature can reach 1100°C.

[0045] In this embodiment, after the mixed gas obtained after preliminary purification and decomposition in the electric heating rotary furnace 2 enters the electric heating vertical furnace 3, it is purified and decomposed again with the hot air entering the electric heating vertical furnace 3, and the heating wire and refractory bricks inside the electric heating vertical furnace 3 can absorb the carbon particles carried by the airflow.

[0046] In this embodiment, the operating temperature of the electric heating vertical furnace 3 is 900°C-1000°C.

[0047] In an optional embodiment, the air preheater 4 includes two fan-shaped heat exchangers 41 arranged in series from bottom to top, and the air inlet is arranged on the side wall of the fan-shaped heat exchanger 41.

[0048] In this embodiment, the air inlet of the lower fan-fin heat exchanger 41 is located near the top of its side wall, while the air inlet of the upper fan-fin heat exchanger 41 is located near the bottom of its side wall. The first preheated air outlet is located near the bottom of the side wall of the lower fan-fin heat exchanger 41, while the second preheated air outlet is located near the top of the side wall of the upper fan-fin heat exchanger 41.

[0049] In this embodiment, the two preheated air outlets are connected to the lower air inlet of the electric heating rotary furnace 2 and the second air inlet of the electric heating vertical furnace 3 through hot air ducts respectively.

[0050] Optionally, an air valve is provided at the air inlet, and the air flow rate of the air entering the air preheater 4 can be controlled by adjusting the air valve. The entire material of the fan-shaped heat exchanger 41 can be 310S stainless steel.

[0051] Since the temperature of the purified gas generated after the semi-coke wastewater and the solid auxiliary material are purified through the electric heating rotary furnace 2 and the electric heating vertical furnace 3 is high, if the purified gas is directly discharged into the atmosphere through the vent pipe 6, the temperature of the vent pipe 6 will be too high, and there will be a safety hazard. Therefore, in the embodiment, the purified gas is heat-exchanged through the air preheater 4, which can reduce the discharge temperature of the purified gas on the one hand, and can also make full use of the heat energy of the purified gas to preheat the air entering the electric heating rotary furnace 2 and the electric heating vertical furnace 3 on the other hand.

[0052] In the embodiment, the temperature of the purified gas discharged from the purified gas outlet of the air preheater 4 is 120-200 DEG C.

[0053] In an alternative embodiment, the vent pipe 6 is a chimney with heat preservation, the height of the vent pipe 6 is not less than 15 meters, and the inside of the vent pipe 6 is provided with an oxygen content analyzer and a thermometer. The oxygen content analyzer and the thermometer can measure the oxygen content and the temperature of the purified gas after heat exchange through the air preheater 4, so that the staff can perform heat supplement and oxygen supplement operations on the semi-coke wastewater electric heating purification device at any time according to the oxygen content and the temperature parameters of the purified gas.

[0054] Optionally, when the oxygen content of the purified gas after heat exchange is ≥10%, and the temperature is ≥110 DEG C, it is considered that the working state of the semi-coke wastewater electric heating purification device is stable, and heat supplement and oxygen supplement operations are not required.

[0055] In an alternative embodiment, the root of the vent pipe 6 can also be provided with a sampling port and a drain valve, so that the staff can sample the purified gas after heat exchange, and the steam water flow in the vent pipe 6 can be periodically discharged.

[0056] The semi-coke wastewater electric heating purification device in the embodiment of the utility model, utilize setting's electric heating rotary furnace and electric heating vertical furnace, through thermal decomposition and catalytic oxidation, the semi-coke wastewater is purified to solid phase residue, water vapor and a small amount of carbon dioxide; the solid auxiliary material is melted with sulfur and metal elements in the semi-coke wastewater to form slag, forming micro-glassified residue to remove harmful substances such as sulfur, and the water in the purified semi-coke wastewater is discharged in a gaseous state, which is beneficial to improve the ecology.

[0057] It should be noted that, in this document, relational terms such as first and second are used solely to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. Furthermore, the terms "comprise," "include," or any other variations thereof are intended to encompass non-exclusive inclusion, such that an article or device comprising a list of elements includes not only those elements but also other elements not explicitly listed. Without further limitation, elements defined by the phrase "comprising a..." do not preclude the presence of additional identical elements in the article or device comprising the elements. Terms such as "connected" or "connected" are not limited to physical or mechanical connections but may include electrical connections, whether direct or indirect. References to directions or positional relationships, such as "upper," "lower," "left," and "right," are based on the directions or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplification of the present invention. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention.

[0058] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A semi-coal wastewater electrothermal purification device, characterized in that: include: A feeder (1), an electric heating rotary furnace (2), an electric heating vertical furnace (3), an air preheater (4), an induced draft fan (5) and a vent pipe (6), wherein: The feeder (1) is provided with a first feed port, a second feed port and a discharge port, wherein the solid auxiliary material enters the feeder (1) through the first feed port, and the semi-coke wastewater enters the feeder (1) through the second feed port; The electric heating rotary furnace (2) is tilted, with a high-position air outlet and a mixing inlet provided at one end thereof, and a low-position air inlet and a residue outlet provided at one end thereof, and the mixing inlet is connected to the discharge port of the feeder (1); The top of the electric heating vertical furnace (3) is provided with a first air inlet and a second air inlet, and an air outlet is provided on the side wall near the bottom, the first air inlet is connected to the high-position air outlet of the electric heating rotary furnace (2), and the air outlet is connected to the air inlet at the bottom of the air preheater (4); An air inlet, a first preheated air outlet, and a second preheated air outlet are provided on the side wall of the air preheater (4), and a purified air outlet is provided on the top. The air inlet is used to introduce air into the air preheater (4), the first preheated air outlet is connected to the low-position air inlet of the electric heating rotary furnace (2), the second preheated air outlet is connected to the second air inlet of the electric heating vertical furnace (3), and the purified air outlet is connected to the air inlet of the induced draft fan (5); The air outlet of the induced draft fan (5) is connected to the air inlet at the bottom of the vent pipe (6), and the vent pipe (6) is used to discharge the purified air.

2. The electrothermal purification device for semi-coal wastewater according to claim 1, characterized in that: The feeder (1) comprises a bracket (11), a horizontal screw propeller (12), a silo (13) and a feed pipe (14), wherein: The silo (13) and the feed pipe (14) are installed on the bracket (11), the silo (13) is located above the feed pipe (14), the silo (13) is used to hold the solid auxiliary material, and the bottom of the silo (13) is connected to the first feed port; The horizontal screw propeller (12) is installed at the first end of the feed pipe (14), and the propulsion rod of the horizontal screw propeller (12) is located inside the feed pipe (14); The first feed port and the second feed port are arranged on the side wall of the feed pipe (14), the discharge port is arranged at the second end of the feed pipe (14), and the second feed port is located on a side close to the discharge port.

3. The electrothermal purification device for semi-coke wastewater according to claim 1, characterized in that: The mass ratio of the solid auxiliary material in the mixture of the solid auxiliary material and the semi-coke wastewater is not less than 1%.

4. The electrothermal purification device for semi-coal wastewater according to claim 1, characterized in that: The solid auxiliary material includes quicklime powder and waste to be processed, the proportion of the quicklime powder in the solid auxiliary material is not less than 50%, and the waste to be processed includes coke powder or activated sludge.

5. The electrothermal purification device for semi-coke wastewater according to claim 1, characterized in that: The working temperature of the electric heating rotary furnace (2) is 800°C-900°C.

6. The electrothermal purification device for semi-coke wastewater according to claim 1, characterized in that: The electric heating vertical furnace (3) comprises an external shell (31) and a heat storage body (32) located inside the external shell (31); an electric heating wire heating plate (33) is arranged above the heat storage body (32); an air intake duct (34) is arranged at the top of the external shell (31); the first air intake port and the second air intake port are arranged on the side wall of the air intake duct (34); an inspection furnace door (35) is arranged at a position near the top of the side wall of the external shell (31); and a ash cleaning furnace door (36) is arranged at a position near the bottom of the side wall of the external shell (31).

7. The electrothermal purification device for semi-coke wastewater according to claim 1, characterized in that: The working temperature of the electric heating vertical furnace (3) is 900°C-1000°C.

8. The electrothermal purification device for semi-coke wastewater according to claim 1, characterized in that: The air preheater (4) comprises two fan-shaped heat exchangers (41) arranged in series from bottom to top, the air inlet is arranged on the side wall of the fan-shaped heat exchanger (41), the first preheated air outlet is arranged on the side wall of the lower fan-shaped heat exchanger (41) near the bottom, and the second preheated air outlet is arranged on the side wall of the upper fan-shaped heat exchanger (41) near the top.

9. The electrothermal purification device for semi-coke wastewater according to claim 1, characterized in that: The temperature of the purified gas discharged from the purified gas outlet of the air preheater (4) is 120°C-200°C.

10. The electrothermal purification device for semi-coke wastewater according to claim 1, characterized in that: The vent pipe (6) is a chimney with heat preservation, the height of the vent pipe (6) is not less than 15 meters, and an oxygen content analyzer and a thermometer are arranged inside the vent pipe (6).

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