Dry tar residue blending, discharging and mixing device and method

Abstract

The invention relates to a tar dry residue blending, discharging and mixing device and method. The tar dry residue blending, discharging and mixing device comprises a tar residue box, a belt conveyor, a connecting rod pushing and discharging mechanism and a plough collecting and mixing mechanism. A tar residue box is arranged above the belt conveyor at the downstream of the coal bunker; the connecting rod residue pushing and discharging mechanism consists of a connecting rod driving motor, a crank, a connecting rod and a push rake, the push rake is arranged at the bottom of the tar residue box, and a plurality of push rake turning plates are longitudinally arranged on the push rake; and the mixed coal ploughing and collecting mechanism is arranged below the tar residue outlet and comprises a front coal ploughing plate and a rear coal collecting plate which can rotate in a lifting manner. The connecting rod slag pushing and discharging mechanism is adopted, the internal space of the tar residue box is not occupied, quantitative slag discharging of the tar residue box is achieved, meanwhile, coal blending operation can be achieved in cooperation with the belt conveyor and the plough collecting and mixing mechanism, meanwhile, pollution to equipment and the environment in the tar residue conveying process is avoided, operation is convenient, and the automation degree is high.

Description

Technical Field

[0001] The present invention relates to the technical field of tar residue re-matching, and in particular to a tar dry residue re-matching, slag discharging and mixing device and method. Background Art

[0002] During the coke oven production process, high-temperature coke oven gas (COG) is condensed and cooled in the gas header or in the primary cooler. High-boiling-point organic compounds condense from the gas into a semi-solid form of coal tar. Simultaneously, pulverized coal, semi-coke, and other materials entrained in the COG mix with the coal tar, forming a sticky tar residue. This tar residue is black, muddy, and easily agglomerated. Its main components include heavy tar, carbon particles, ash, and a small amount of organic matter, and it is typically treated as solid waste. Because it contains combustible components and potentially harmful substances (such as polycyclic aromatic hydrocarbons and heavy metals), direct discharge can pollute the environment. However, through appropriate recycling, it can be converted into a valuable resource.

[0003] Tar residue has a high calorific value (approximately 20-30 MJ / kg) and can be mixed with coal as an auxiliary fuel for coke ovens, industrial boilers, cement kilns, or power plants. For auxiliary coke oven coking, for example, ultracentrifuge separation technology can be used. The centrifuge's strong solid-liquid separation capability improves the separation of tar residue from tar and ammonia. The resulting dry tar residue (referred to as tar residue) contains less than 20% tar and ammonia (the dryness of the tar residue is adjustable), resulting in a loose, powdery state. The high-speed operation of the centrifuge separates the oil from the residue. The centrifuged dry tar residue enters a dry residue collection tank and is regularly transported to the coal blending system via tar residue boxes. Coking coal is then added to the coke oven for coking. Tar residue contains a large amount of fixed carbon and volatile polycyclic aromatic hydrocarbons (PAHs). Under high-temperature conditions, these PAHs can be burned and decomposed into CO2 and H2O. During the coking process, about 56% of tar residue is converted into coke, about 19% into coal tar, and about 24% into coal gas. Therefore, adding tar residue to coking coal can achieve the purpose of energy conservation and emission reduction.

[0004] The main problems existing in the existing tar residue recycling coking include: (1) Before the tar residue is separated by a centrifuge, due to the viscosity of the tar residue, its fluidity in the tar residue box is poor. The tar residue box needs to be heated and insulated, and a screw conveyor is used for forced discharge. The screw conveyor occupies a large space in the tar residue box and consumes a lot of power. (2) Before the tar residue is separated by a centrifuge, due to the viscosity of the tar residue and poor fluidity, the electric gate equipment is difficult to operate. Therefore, the tar residue outlet of the tar residue box is mostly manual gate, and the tar residue outlet is not tightly closed, which easily leads to environmental pollution. (3) The existing tar residue box does not have the function of mixing tar residue with the coal charged. Summary of the Invention

[0005] The present invention provides a tar dry slag back-mixing, slag discharge and mixing device and method, which adopts a connecting rod pushing slag discharge mechanism, does not occupy the internal space of the tar slag box, realizes quantitative slag discharge from the tar slag box, and can also cooperate with a belt conveyor and a plowing and mixing coal mechanism to realize coal blending operation, while avoiding the pollution of the tar slag transportation process to the equipment and the environment, and is easy to operate and has a high degree of automation.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The tar slag is discharged by the conveyor belt and the tar slag is discharged by the conveyor belt.

[0008] An electric heating device is arranged on the periphery of the tar slag box.

[0009] The push rake flap is connected to the push rake body by a ratchet mechanism; in the process of the connecting rod driving the crank to rotate and the crank driving the push rake to move back and forth horizontally through the connecting rod, when the pushing target moves towards the tar residue outlet end, the push rake flap is in a vertical state, and when the pushing target moves away from the tar residue outlet end, the push rake flap is tilted backward and the angle with the horizontal plane is ≤15°; the connecting rod driving motor is a variable frequency speed regulation motor.

[0010] The plowing and collecting mixed coal mechanism consists of a mixed coal bracket, a cross bar, a front plowing coal plate, a rear coal collecting plate, a lifting motor and a flipping motor. The mixed coal bracket is fixedly arranged, and a vertical slide is provided on the mixed coal bracket. Under the action of the lifting motor, the cross bar can be lifted and moved along the vertical slide; one end of the front plowing coal plate and one end of the rear coal collecting plate are respectively connected to the cross bar through corresponding flipping motors. Driven by the flipping motor, the front plowing coal plate and the rear coal collecting plate can rotate between the horizontal and vertical directions.

[0011] The lower end faces of the front plow coal plate and the rear coal collecting plate are both wavy surfaces; wherein, the lower end of the front plow coal plate is provided with a plurality of concave structures in the transverse direction, and the lower end of the rear coal collecting plate is provided with a convex structure at a position corresponding to the groove of the front plow coal plate; the front plow coal plate has a convex arc surface on one side along the material conveying direction of the belt conveyor, and a flat surface on the other side; the rear coal collecting plate has a flat surface on one side along the material conveying direction of the belt conveyor, and a concave arc surface on the other side.

[0012] The distance between the front coal plowing plate and the rear coal collecting plate can be adjusted within a range of 500 to 800 mm.

[0013] A mounting bracket is arranged on the outer side of the belt conveyor below the tar slag box, and a connecting rod driving motor and a plowing and collecting coal mixing mechanism are both arranged on the mounting bracket.

[0014] A tar dry slag recycling and slag mixing device also includes a slag mixing and discharging control system, which includes a material detector, a limit switch, a level meter and a controller; along the material conveying direction of the belt conveyor, the material detector is arranged upstream of the plowing and collecting coal mixing mechanism; the limit switch is arranged on the plowing and collecting coal mixing mechanism, and is used to control the height of the front plowing coal plate and the rear coal collecting plate after they move downward; the level meter is arranged at the bottom of the tar slag box; the signal output ends of the material detector, the limit switch and the level meter are respectively connected to the controller; the controller is also connected to the control system of the belt conveyor, as well as the control ends of the connecting rod drive motor, the lifting motor, the flip motor and the electric outlet gate.

[0015] A method for mixing tar dry residue, slag removal and slag mixing, comprising the following steps:

[0016] 1) Start the belt conveyor and send a signal indicating that the belt conveyor has started to the controller of the slag discharge and mixing control system through the belt conveyor control system; the material detector monitors in real time whether there is coal on the belt conveyor and the average thickness of the coal layer, and sends the detection data to the controller;

[0017] 2) The controller presets the mixing ratio of coal and tar residue and calculates the descending height of the front plowing plate and the rear coal collecting plate based on the preset mixing ratio; when the belt conveyor starts, the controller controls the lifting motor to start, causing the front plowing plate and the rear coal collecting plate to descend, and the end point of the descent is controlled by the limit switch;

[0018] 3) After the controller receives the in-position signal from the limit switch, it controls the flip motor to start, causing the front plowing plate and the rear coal collecting plate to rotate synchronously downward to a vertical state;

[0019] 4) Upon receiving the incoming material signal from the material detector, the controller controls the electric outlet gate to open; at the same time, it controls the connecting rod drive motor to drive the push rake to move back and forth at a set frequency, pushing the tar slag in the tar slag box out of the tar slag outlet at a uniform speed and dropping it into the groove opened by the front plow coal plate on the coal material. When the coal material carrying tar slag passes through the rear coal collecting plate, the rear coal collecting plate gathers the coal material into the groove and covers the tar slag, forming a coal slag mixture with a "tar slag interlayer";

[0020] 5) When the material level meter in the tar slag box detects that the actual material level is lower than the set minimum material level, the controller controls the connecting rod drive motor and the electric outlet gate to close in sequence; then the controller controls the lifting motor to restart, raise the plowing and mixing coal mechanism, and then controls the flip motor to restart, so that the front plowing coal plate and the rear coal collecting plate rotate in the opposite direction and retract to a horizontal state.

[0021] During the mixing process of coal and tar residue, the controller dynamically calculates the downward pressure depth of the front plowing coal plate and the rear coal collecting coal plate relative to the coal surface according to the thickness of the coal. The calculation formula is: H = k × T, where H is the downward pressure depth, T is the detected coal thickness, and k is a coefficient set according to the preset mixing ratio of coal and tar residue, 0.1≤k≤0.3.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] (1) The connecting rod push slag discharge mechanism is adopted, which does not occupy the internal space of the tar slag box;

[0024] (2) The connecting rod pushing and discharging mechanism is driven by a variable frequency speed regulating motor and adopts a structure of multiple groups of pushing rakes and flaps to achieve multi-way adjustment of the discharging flow rate, which not only meets the demand for adjusting the amount of tar slag during coal matching, but also helps save energy;

[0025] (3) The coal blending operation can be realized by cooperating with the belt conveyor and the plowing and collecting coal mixing mechanism. The plowing and collecting coal mixing mechanism can realize the automatic detection and precise positioning. The coal mixing process fully utilizes the driving force of the belt conveyor itself, without the need for additional driving devices.

[0026] (4) Coal blending avoids the pollution of equipment during the transportation of tar residue and greatly reduces the environmental pollution caused by the spread of tar residue odor;

[0027] (5) The operation process is simple and convenient, with a high degree of automation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the tar dry slag recycling, slag discharge and slag mixing device of the present invention (the connecting rod pushing slag discharge mechanism and the plowing and coal mixing mechanism are both in the initial state).

[0029] Figure 2It is a schematic diagram of the working state of the tar dry slag recycling, slag discharge and slag mixing device of the present invention.

[0030] Figure 3 It is a schematic diagram of the working process principle of the connecting rod pushing and slag discharge mechanism of the present invention (1 working cycle).

[0031] Figure 4 It is a schematic diagram of the working state of the plowing and mixing coal mechanism of the present invention.

[0032] Figure 5a It is a front view of the front plow coal plate of the present invention.

[0033] Figure 5b yes Figure 5a Top view of .

[0034] Figure 6a It is a front view of the rear coal collecting plate of the present invention.

[0035] Figure 6b yes Figure 6a Top view of .

[0036] Figure 7 It is a schematic diagram of the working state of the front plow coal plate of the present invention.

[0037] Figure 8 It is a schematic diagram of the control system of the tar dry slag recycling, slag discharge and slag mixing device of the present invention.

[0038] In the figure: 1-connecting rod drive motor; 2-connecting rod; 3-push rake turning plate; 4-material detector; 5-plowing and collecting coal mixing mechanism; 501-front plowing coal plate; 502-rear collecting coal plate; 6-lifting motor; 7-turning motor; 8-limit switch; 9-electric outlet gate; 10-level meter; 11-control box; 12-tar slag box; 13-belt conveyor; 14-coal for charging the furnace. DETAILED DESCRIPTION

[0039] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0040] like Figure 1 、 Figure 2As shown, the tar dry slag recycling, slag discharge and mixing device of the present invention comprises a tar slag box 12, a belt conveyor 13, a connecting rod pushing slag discharge mechanism and a plowing and collecting coal mixing mechanism 5; the feeding end of the belt conveyor 13 is connected to the coal outlet of the coal bunker, a tar slag box 12 is arranged above the belt conveyor 13 downstream of the coal bunker, a tar slag outlet is arranged at the bottom of the tar slag box 12 near one end of the coal bunker, and an electric outlet gate 9 is arranged at the tar slag outlet; the connecting rod pushing slag discharge mechanism is composed of a connecting rod driving motor 1, a crank, a connecting rod 2 and a pushing rake assembly connected in sequence. A pusher rake is provided at the bottom of the tar slag box 12 along the slag discharge direction, and a plurality of pusher rake flaps 3 are provided longitudinally on the upper edge of the pusher rake; the plowing and mixing coal mechanism 5 is provided below the tar slag outlet, and a front plowing coal plate 501 and a rear coal collecting plate 502 are provided in the plowing and mixing coal mechanism 5; the front plowing coal plate 501 and the rear coal collecting plate 502 can be raised and lowered, and can be switched between horizontal and vertical states; along the material conveying direction of the belt conveyor 13, the front plowing coal plate 501 is provided upstream of the tar slag outlet, and the rear coal collecting plate 502 is provided downstream of the tar slag outlet.

[0041] An electric heating device is provided on the periphery of the tar slag box 12 .

[0042] The pushing rake flap 3 is connected to the pushing rake body by a ratchet mechanism; in the process of the connecting rod driving motor 1 driving the crank to rotate and the crank driving the pushing rake to and fro horizontally through the connecting rod 2, when the pushing target moves toward the tar residue outlet end, the pushing rake flap 3 is in a vertical state, and when the pushing target moves away from the tar residue outlet end, the pushing rake flap 3 is tilted backward and the angle with the horizontal plane is ≤15°; the connecting rod driving motor 1 is a variable frequency speed regulation motor.

[0043] like Figure 1 、 Figure 4 As shown, the plowing and collecting mixed coal mechanism 5 is composed of a mixed coal bracket, a cross bar, a front plowing coal plate 501, a rear coal collecting plate 502, a lifting motor 6 and a flipping motor 7. The mixed coal bracket is fixedly arranged, and a vertical slide is provided on the mixed coal bracket. Under the action of the lifting motor 6, the cross bar can be lifted and moved along the vertical slide; one end of the front plowing coal plate 501 and one end of the rear coal collecting plate 502 are respectively connected to the cross bar through the corresponding flipping motor 7. Driven by the flipping motor 7, the front plowing coal plate 501 and the rear coal collecting plate 502 can rotate between the horizontal direction and the vertical direction.

[0044] like Figure 5a 、 Figure 5b 、 Figure 6a 、 Figure 6bAs shown, the lower end surface of the front plow coal plate 501 and the lower end surface of the rear coal collecting plate 502 are both wavy surfaces; wherein, the lower end of the front plow coal plate 501 is provided with a plurality of concave structures along the transverse direction, and the lower end of the rear coal collecting plate 502 is provided with a convex structure at the position corresponding to the groove of the front plow coal plate 501; the front plow coal plate 501 has a convex arc surface on one side along the material conveying direction of the belt conveyor 13, and a flat surface on the other side; the rear coal collecting plate 502 has a flat surface on one side along the material conveying direction of the belt conveyor 13, and a concave arc surface on the other side.

[0045] The distance between the front coal plowing plate 501 and the rear coal collecting plate 502 can be adjusted within a range of 500 to 800 mm.

[0046] A mounting bracket is provided on the outer side of the belt conveyor 13 below the tar slag box 12 , and the connecting rod driving motor 1 and the plowing and coal mixing mechanism 5 are both provided on the mounting bracket.

[0047] like Figure 8 As shown, the tar dry slag recycling, slag discharge and mixing device described in the present invention also includes a slag discharge and mixing control system, which includes a material detector 4, a limit switch 8, a level meter 10 and a controller; along the material conveying direction of the belt conveyor 13, the material detector 4 is arranged upstream of the plowing and coal mixing mechanism 5; the limit switch 8 is arranged on the plowing and coal mixing mechanism 5, and is used to control the height of the front plowing coal plate 501 and the rear coal collecting plate 502 after they move downward; the level meter 10 is arranged at the lower part of the tar slag box 12; the signal output ends of the material detector 4, the limit switch 8 and the level meter 10 are respectively connected to the controller; the controller is also connected to the control system of the belt conveyor 13, as well as the control ends of the connecting rod drive motor 1, the lifting motor 6, the flip motor 7 and the electric outlet gate 9.

[0048] The method for mixing tar dry residue, slag removal and slag mixing according to the present invention comprises the following steps:

[0049] 1) Start the belt conveyor 13, and send a signal indicating that the belt conveyor 13 has started to the controller of the slag discharge and mixing control system through the belt conveyor control system; the material detector 4 monitors in real time whether there is coal on the belt conveyor 13 and the average thickness of the coal layer, and sends the detection data to the controller;

[0050] 2) The controller presets the mixing ratio of coal and tar residue and calculates the descending height of the front coal plowing plate 501 and the rear coal collecting plate 502 based on the preset mixing ratio; simultaneously with the start of the belt conveyor 13, the controller controls the start of the lifting motor 6 to lower the front coal plowing plate 501 and the rear coal collecting plate 502, and the end position of the descent is controlled by the limit switch 8;

[0051] 3) After receiving the in-position signal from the limit switch 8, the controller controls the flip motor 7 to start, causing the front coal plowing plate 501 and the rear coal collecting plate 502 to rotate synchronously downward and unfold to a vertical state;

[0052] 4) Upon receiving the incoming material signal from the material detector 4, the controller controls the electric outlet gate 9 to open; at the same time, the controller controls the connecting rod drive motor 1 to drive the push rake to move back and forth at a set frequency, pushing the tar slag in the tar slag box 12 out of the tar slag outlet at a uniform speed and dropping it into the groove opened by the front plow coal plate 501 on the coal material. When the coal material carrying the tar slag passes through the rear coal collecting plate 502, the rear coal collecting plate 502 gathers the coal material into the groove and covers the tar slag, forming a coal slag mixture with a "tar slag interlayer";

[0053] 5) When the material level meter 10 in the tar slag box 12 detects that the actual material level is lower than the set minimum material level, the controller sequentially controls the connecting rod drive motor 1 and the electric outlet gate 9 to close; then the controller controls the lifting motor 6 to restart, raise the plowing and mixing coal mechanism 5, and then controls the flip motor 7 to restart, so that the front plowing coal plate 501 and the rear coal collecting plate 502 rotate in the opposite direction and retract to a horizontal state.

[0054] During the mixing process of coal and tar residue, the controller dynamically calculates the downward pressure depth of the front plowing coal plate 501 and the rear coal collecting plate 502 relative to the coal surface according to the thickness of the coal. The calculation formula is: H = k × T, where H is the downward pressure depth, T is the detected coal thickness, and k is a coefficient set according to the preset mixing ratio of coal and tar residue, 0.1≤k≤0.3.

[0055] The present invention relates to a tar dry slag return, slag discharge and mixing device, comprising: a belt conveyor 13, a tar slag box 12 (with an electric outlet gate 9 at the bottom), a connecting rod pushing slag discharge mechanism (driven by a variable frequency speed regulating motor, using a four-link mechanism to drive the push rake to move horizontally back and forth, the push rake flap 3 is connected to the push rake body by a ratchet mechanism, rotates to a vertical state when pushing the tar slag, and is in a slightly inclined state with an angle of less than 15° with the horizontal plane when returning. The process diagram is shown in FIG. Figure 3 As shown), a plowing and coal mixing mechanism 5 (equipped with a front plowing coal plate 501 and a rear coal collecting plate 502, the height and angle of which are controlled by a lifting motor 6, a limit switch 8 and a flip motor 7), a material detector 4 (installed upstream of the tar slag box 12, for real-time detection of the coal thickness of the belt conveyor 13), a controller (installed in a control box 11, mainly used to receive output signals of the material detector 4 and the material level meter 10, and to control the opening and closing and action of the connecting rod pushing slag discharge mechanism, the electric outlet gate 9 and the plowing and coal mixing mechanism 5), etc.

[0056] The working principle of the tar dry slag recycling, slag discharge and mixing device of the present invention is as follows: the thickness of the coal material on the belt conveyor 13 is detected by the material detector 4, and the pressing depth of the front plowing coal plate 501 and the rear coal collecting plate 502 in the plowing and mixing coal mechanism 5 is controlled by the controller; the front plowing coal plate 501 is used to make grooves in the coal material (such as Figure 7 As shown in the figure), while the electric outlet gate 9 of the tar slag box 12 is opened, the tar slag is pushed into the groove opened on the coal material by using the connecting rod pushing slag discharge mechanism with variable frequency speed regulation, and then the groove filled with tar slag is covered by the rear coal collecting plate 502 to form a coal slag mixture with a "tar slag interlayer". When the tar slag in the tar slag box 12 is emptied, the electric outlet gate 9 is closed, and the connecting rod pushing slag discharge mechanism and the plow collecting coal mixing mechanism 5 are reset.

[0057] In order to more intuitively embody the present invention, the embodiments of the present invention are further described in conjunction with examples. The following examples are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technical solution that can be obviously obtained by a person skilled in the art within the technical scope disclosed in the present invention, including simple changes or equivalent replacements, is within the scope of protection of the present invention.

[0058] [Example]

[0059] In this embodiment, the tar dry residue mixing and slag mixing process is as follows:

[0060] 1) Start the belt conveyor, and send a signal indicating that the belt conveyor has started to the controller of the slag discharge and mixing control system through the belt conveyor control system; the material detector detects that the average thickness of the coal material layer on the belt conveyor is 400 mm, and sends the detection data to the controller;

[0061] 2) The controller presets a coal to tar residue mixing ratio of tar residue: coal material = 1:200 (mass ratio). Based on the preset mixing ratio, the calculated downward pressure depth of the front plowing plate and the rear coal collecting plate is 80 mm. Simultaneously with the start of the belt conveyor, the controller controls the lifting motor to start, causing the front plowing plate and the rear coal collecting plate to descend, with the limit switch controlling the end point of the descent.

[0062] 3) After the controller receives the in-position signal from the limit switch, it controls the flip motor to start, causing the front plowing plate and the rear coal collecting plate to rotate synchronously downward to a vertical state;

[0063] 4) Upon receiving the incoming material signal from the material detector, the controller controls the electric outlet gate to open; at the same time, it controls the connecting rod drive motor to drive the push rake to move back and forth, pushing the tar slag in the tar slag box out of the tar slag outlet at a uniform speed and dropping it into the groove opened by the front plow coal plate on the coal material. When the coal material with tar slag passes through the rear coal collecting plate, the rear coal collecting plate gathers the coal material on both sides of the tar slag into the groove, forming a coal slag mixture with a "tar slag interlayer";

[0064] 5) When the material level meter in the tar slag box detects that the actual material level is 1% lower than the initial material level, the controller controls the connecting rod drive motor and the electric outlet gate to close in sequence; then the controller controls the lifting motor to restart, raise the plowing and mixing coal mechanism, and then controls the flip motor to restart, so that the front plowing coal plate and the rear coal collecting plate rotate in the opposite direction and retract to a horizontal state.

[0065] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A tar dry residue re-mixing and slag discharging device, characterized in that: It includes a tar slag box, a belt conveyor, a connecting rod pushing and discharging mechanism and a plowing and collecting coal mixing mechanism; the feeding end of the belt conveyor is connected to the coal outlet of the coal bunker, a tar slag box is arranged above the belt conveyor downstream of the coal bunker, a tar slag outlet is arranged at the bottom of the tar slag box near one end of the coal bunker, and an electric outlet gate is arranged at the tar slag outlet; the connecting rod pushing and discharging mechanism is composed of a connecting rod driving motor, a crank, a connecting rod and a pushing rake connected in sequence, the pushing rake is arranged at the bottom of the tar slag box along the slag discharge direction, and a plurality of pushing rake flaps are arranged longitudinally on the pushing rake; the plowing and collecting coal mixing mechanism is arranged below the tar slag outlet, and a front plowing coal plate and a rear coal collecting plate are arranged in the plowing and collecting coal mixing mechanism, the front plowing coal plate and the rear coal collecting plate can be raised and lowered, and can be switched between horizontal and vertical states; along the material conveying direction of the belt conveyor, the front plowing coal plate is arranged upstream of the tar slag outlet, and the rear coal collecting plate is arranged downstream of the tar slag outlet.

2. The tar dry residue re-mixing, slag discharge and slag mixing device according to claim 1, characterized in that: An electric heating device is arranged on the periphery of the tar slag box.

3. The tar dry residue re-mixing, slag discharge and slag mixing device according to claim 1, characterized in that: The push rake flap is connected to the push rake body by a ratchet mechanism; in the process of the connecting rod driving the crank to rotate and the crank driving the push rake to move back and forth horizontally through the connecting rod, when the pushing target moves towards the tar residue outlet end, the push rake flap is in a vertical state, and when the pushing target moves away from the tar residue outlet end, the push rake flap is tilted backward and the angle with the horizontal plane is ≤15°; the connecting rod driving motor is a variable frequency speed regulation motor.

4. The tar dry residue re-mixing, slag discharge and slag mixing device according to claim 1, characterized in that: The plowing and collecting mixed coal mechanism consists of a mixed coal bracket, a cross bar, a front plowing coal plate, a rear coal collecting plate, a lifting motor and a flipping motor. The mixed coal bracket is fixedly arranged, and a vertical slide is provided on the mixed coal bracket. Under the action of the lifting motor, the cross bar can be lifted and moved along the vertical slide; one end of the front plowing coal plate and one end of the rear coal collecting plate are respectively connected to the cross bar through corresponding flipping motors. Driven by the flipping motor, the front plowing coal plate and the rear coal collecting plate can rotate between the horizontal and vertical directions.

5. The tar dry residue re-mixing, slag discharge and slag mixing device according to claim 1, characterized in that: The lower end faces of the front plow coal plate and the rear coal collecting plate are both wavy surfaces; wherein, the lower end of the front plow coal plate is provided with a plurality of concave structures in the transverse direction, and the lower end of the rear coal collecting plate is provided with a convex structure at a position corresponding to the groove of the front plow coal plate; the front plow coal plate has a convex arc surface on one side along the material conveying direction of the belt conveyor, and a flat surface on the other side; the rear coal collecting plate has a flat surface on one side along the material conveying direction of the belt conveyor, and a concave arc surface on the other side.

6. The tar dry residue re-mixing, slag discharge and slag mixing device according to claim 1, characterized in that: The distance between the front coal plowing plate and the rear coal collecting plate can be adjusted within a range of 500 to 800 mm.

7. The tar dry residue re-mixing, slag discharge and slag mixing device according to claim 1, characterized in that: A mounting bracket is arranged on the outer side of the belt conveyor below the tar slag box, and a connecting rod driving motor and a plowing and collecting coal mixing mechanism are both arranged on the mounting bracket.

8. The tar dry residue re-mixing, slag removal and slag mixing device according to claim 1, characterized in that: It also includes a slag discharge and mixing control system, which includes a material detector, a limit switch, a level meter and a controller; along the material conveying direction of the belt conveyor, the material detector is arranged upstream of the plowing and collecting coal mixing mechanism; the limit switch is arranged on the plowing and collecting coal mixing mechanism, which is used to control the height of the front plowing coal plate and the rear coal collecting plate after they move downward; the level meter is arranged at the bottom of the tar slag box; the signal output ends of the material detector, the limit switch and the level meter are respectively connected to the controller; the controller is also connected to the control system of the belt conveyor, as well as the control ends of the connecting rod drive motor, the lifting motor, the flip motor and the electric outlet gate.

9. A method for recycling, discharging and mixing tar dry residue, which is realized based on the tar dry residue recycling, discharging and mixing device according to any one of claims 1 to 8, characterized in that: The steps include: 1) Start the belt conveyor and send a signal indicating that the belt conveyor has started to the controller of the slag discharge and mixing control system through the belt conveyor control system; the material detector monitors in real time whether there is coal on the belt conveyor and the average thickness of the coal layer, and sends the detection data to the controller; 2) The controller presets the mixing ratio of coal and tar residue and calculates the descending height of the front plowing plate and the rear coal collecting plate based on the preset mixing ratio; when the belt conveyor starts, the controller controls the lifting motor to start, causing the front plowing plate and the rear coal collecting plate to descend, and the end point of the descent is controlled by the limit switch; 3) After the controller receives the in-position signal from the limit switch, it controls the flip motor to start, causing the front plowing plate and the rear coal collecting plate to rotate synchronously downward to a vertical state; 4) Upon receiving the incoming material signal from the material detector, the controller controls the electric outlet gate to open; at the same time, it controls the connecting rod drive motor to drive the push rake to move back and forth at a set frequency, pushing the tar slag in the tar slag box out of the tar slag outlet at a uniform speed and dropping it into the groove opened by the front plow coal plate on the coal material. When the coal material carrying tar slag passes through the rear coal collecting plate, the rear coal collecting plate gathers the coal material into the groove and covers the tar slag, forming a coal slag mixture with a "tar slag interlayer"; 5) When the material level meter in the tar slag box detects that the actual material level is lower than the set minimum material level, the controller controls the connecting rod drive motor and the electric outlet gate to close in sequence; then the controller controls the lifting motor to restart, raise the plowing and mixing coal mechanism, and then controls the flip motor to restart, so that the front plowing coal plate and the rear coal collecting plate rotate in the opposite direction and retract to a horizontal state.

10. A method for mixing tar dry residues according to claim 9, characterized in that: During the mixing process of coal and tar residue, the controller dynamically calculates the downward pressure depth of the front plowing coal plate and the rear coal collecting coal plate relative to the coal surface according to the thickness of the coal. The calculation formula is: H = k × T, where H is the downward pressure depth, T is the detected coal thickness, and k is a coefficient set according to the preset mixing ratio of coal and tar residue, 0.1≤k≤0.3.

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