Dry quenching system

Abstract

The invention belongs to the technical field of dry quenching, and particularly relates to a dry quenching system which comprises a dry quenching furnace, a dust removal unit and a heat exchange unit, nitrogen sequentially enters a primary dust remover and a primary heat exchanger along the gas output end of the dry quenching furnace, and the system further comprises a secondary dust remover and a secondary heat exchanger. The nitrogen output end of the primary heat exchanger is connected with the nitrogen input end of the secondary heat exchanger, the nitrogen output end of the secondary heat exchanger is connected with the input end of the secondary dust remover, and the output end of the secondary dust remover is connected with the gas input end of the dry quenching furnace through the circulating pump. By additionally arranging the secondary dust remover and the secondary heat exchanger, multi-stage cooling and dust removal are achieved, the nitrogen purification degree and the waste heat recovery efficiency are remarkably improved, equipment abrasion is reduced, and the service life of the system is prolonged.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of dry quenching, and particularly relates to a dry quenching system. BACKGROUND

[0002] As a key environmental protection and energy saving technology in the steel industry to replace the traditional wet quenching, the dry quenching technology realizes the cooling of red coke while recovering a large amount of waste heat for power generation or heating through the indirect heat exchange between nitrogen and high-temperature red coke, which can not only significantly reduce waste water discharge and energy waste, but also improve the quality of coke.

[0003] However, the existing dry quenching system mostly adopts single-stage dust removal and single-stage heat exchange design, and part of fine dust is still left after the nitrogen is once removed, which is easy to adhere to the surface of components such as heat exchanger pipes and circulating pump impellers in long-term circulation, resulting in the decrease of heat exchange efficiency and the aggravation of equipment wear.

[0004] In addition, in order to avoid the high-temperature red coke from entering the inside of the uniform air cap to cause blockage, the gas outlet of the existing uniform air cap is mostly arranged on the side, which forms a block and a guide to the coke through the cap body itself, but this design makes the nitrogen discharged from the gas outlet mainly flow to the two sides or the lower half of the cooling section, and it is difficult to diffuse upward to the upper half area of the cooling section, resulting in that the red coke located in the upper half of the cooling section cannot be fully contacted and exchanged with the nitrogen, and the problems of incomplete cooling and slow cooling speed occur, which further causes poor red coke cooling uniformity and large coke quality fluctuation. SUMMARY

[0005] In order to solve the problems existing in the prior art, the present application provides a dry quenching system, which realizes multi-stage cooling and dust removal by additionally arranging a secondary dust remover and a secondary heat exchanger, significantly improves the nitrogen purification degree and waste heat recovery efficiency, reduces the equipment wear, and prolongs the service life of the system.

[0006] The specific technical scheme adopted by the present application is: A dry quenching system, which comprises a dry quenching furnace, a dust removal unit and a heat exchange unit, nitrogen enters a primary dust remover and a primary heat exchanger in sequence along the gas output end of the dry quenching furnace, the system further comprises a secondary dust remover and a secondary heat exchanger, the nitrogen output end of the primary heat exchanger is connected with the nitrogen input end of the secondary heat exchanger, the nitrogen output end of the secondary heat exchanger is connected with the input end of the secondary dust remover, and the output end of the secondary dust remover is connected with the gas input end of the dry quenching furnace through a circulating pump.

[0007] The initial heat exchanger is further arranged between the primary dust remover and the primary heat exchanger, the nitrogen input end of the initial heat exchanger is connected with the output end of the primary dust remover, the nitrogen output end of the initial heat exchanger is connected with the nitrogen input end of the primary heat exchanger, the cooling medium input end of the initial heat exchanger is connected with the cooling medium output end of the secondary heat exchanger, and the cooling medium output end of the initial heat exchanger and the cooling medium output end of the primary heat exchanger are respectively connected with the waste heat recovery device.

[0008] The dry quenching furnace comprises a furnace body, the inside of the furnace body is sequentially provided with a pre-storage section, a transition section and a cooling section from top to bottom, the transition section is sleeved with an annular exhaust passage, the transition section is provided with an exhaust port on the side thereof and in communication with the exhaust passage, the cooling section is provided with an air equalizing cap, the input end of the air equalizing cap is connected with the gas input end of the dry quenching furnace, and the solid phase output end of the furnace body is provided with a discharger.

[0009] The discharger comprises a discharging pipeline and a vibrator, the discharging pipeline comprises a main body part arranged in a horizontal direction, two ends of the main body part are respectively provided with an inlet pipe opening and a discharging pipe opening, the directions of the inlet pipe opening and the discharging pipe opening are respectively perpendicular to the main body part and opposite to each other, and the vibrating end of the vibrator is connected with one end of the main body part close to the inlet pipe opening through a conductive sheet.

[0010] The cap body of the air equalizing cap is additionally provided with a plugging assembly, the plugging assembly comprises a swing rod, a counterweight cap and an adapter rod, the hinged end of the swing rod is hinged to the inner wall of the cap body, the counterweight cap is connected with the hinged end of the swing rod through the adapter rod, the counterweight cap has the freedom of reciprocating movement in the vertical direction through the blowing of nitrogen, the swing rod has the freedom of swinging around the hinged end through the reciprocating movement of the counterweight cap, a plug is further arranged on the swing rod, an air vent in sealing cooperation with the plug is arranged on the cap body, and the plug has the freedom of sealing the air vent and moving away from the air vent through the swinging of the swing rod.

[0011] The counterweight cap has a downwardly open cap structure, a guide column and a limiting sleeve are further arranged on the counterweight cap, the limiting sleeve is fixedly connected with the inner wall of the air equalizing cap, the counterweight cap is fixedly connected with the guide column, the free end of the adapter rod is lapped to the top of the guide column, the guide column and the limiting sleeve are in sleeve cooperation and have the freedom of sliding along the limiting sleeve, and when the counterweight cap rises to the limit position, the lower edge of the counterweight cap is flush with the air outlet of the air equalizing cap.

[0012] A limiting sliding block is arranged on the side of the guide column, and a limiting sliding groove matched with the limiting sliding block is arranged on the side wall of the limiting sleeve, and the limiting sliding groove limits the reciprocating movement of the counterweight cap in the vertical direction.

[0013] The air outlet end of the air vent is in a concave bowl structure, a protective sleeve is arranged at the air vent and located in the bowl structure, and the end of the protective sleeve is below the outer wall surface of the cap body.

[0014] A guide notch is arranged at the peripheral edge of the counterweight cap, and nitrogen gas passes through the counterweight cap along the guide notch and flows to the air vent.

[0015] The present application has the following advantages: 1. The dry quenching system in the present application realizes multi-stage cooling and dust removal by adding a secondary dust collector and a secondary heat exchanger, significantly improves the nitrogen purification degree and the waste heat recovery efficiency, reduces the equipment wear, and prolongs the service life of the system.

[0016] 2. The discharge pipeline in the present application is designed in a Z-shaped structure, so that a material falling buffer is formed at the joint between the feed pipe opening and the main body, thereby avoiding the blockage caused by the rapid accumulation of coke and the pulverization caused by the rapid falling of coke, and the vibrator makes the coke in the horizontal main body move at a uniform speed by vibration.

[0017] 3. The air equalization cap in the present application is additionally provided with a plugging assembly, when nitrogen gas is input from the bottom of the air equalization cap, part of the nitrogen gas flows to the lower half of the cooling section from the original side air outlet, and the other part of the nitrogen gas pushes the counterweight cap and makes it move upward, the counterweight cap drives the swing rod to swing around the hinged end through the adapter rod, thereby making the plug move away from the air vent, part of the nitrogen gas is sprayed upward from the air vent, covering the upper half of the cooling section, and since the nitrogen gas continues to flow to the air vent at this time, coke powder or debris will not enter the air equalization cap; when the input of cooling gas to the cooling section is stopped, the counterweight cap slides down under the action of gravity, the swing rod and the plug are reset, and the air vent is re-plugged, thereby avoiding the entry of coke powder or debris into the air equalization cap through the air vent. Through the design of the plugging assembly and the air vent, the nitrogen gas is uniformly distributed in the whole area of the cooling section, and the problem of incomplete cooling of red coke in the cooling section is solved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a system schematic diagram of the present application; Figure 2 It is a structural schematic diagram of the dry quenching furnace; Figure 3 It is a structural schematic diagram of the air equalization cap when the air is input; Figure 4 It is a structural schematic diagram of the air equalization cap when the air input is stopped; Figure 5 It is a bottom view structural schematic diagram of the counterweight cap; Figure 6 It is a structural schematic diagram of the air vent; In the attached diagram, 1. Furnace body, 2. Pre-storage section, 3. Transition section, 4. Cooling section, 5. Exhaust duct, 6. Air distribution cap, 601. Cap body, 602. Swing rod, 603. Counterweight cap, 604. Adapter rod, 605. Plug, 606. Air outlet, 607. Guide column, 608. Limiting sleeve, 609. Limiting slider, 610. Limiting groove, 611. Guide notch, 7. Discharge pipe, 701. Main body, 702. Feed inlet, 703. Discharge outlet, 704. Conducting plate, 8. Vibrator, 9. Vent, 10. Protective sleeve. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: Specific embodiments, such as Figure 1 As shown, a dry quenching coke system includes a dry quenching furnace, a dust removal unit, and a heat exchange unit. Nitrogen gas enters the primary dust collector and the primary heat exchanger sequentially from the gas output end of the dry quenching furnace. The system also includes a secondary dust collector and a secondary heat exchanger. The nitrogen output end of the primary heat exchanger is connected to the nitrogen input end of the secondary heat exchanger, and the nitrogen output end of the secondary heat exchanger is connected to the input end of the secondary dust collector. The output end of the secondary dust collector is connected to the gas input end of the dry quenching furnace via a circulating pump.

[0020] Because existing dry quenching systems mostly adopt single-stage dust removal and single-stage heat exchange designs, some fine dust remains after nitrogen gas undergoes one dust removal process. Over a long period of circulation, this dust tends to adhere to the surfaces of components such as heat exchanger pipes and circulating pump impellers, leading to decreased heat exchange efficiency and increased equipment wear.

[0021] Therefore, the dry quenching system in this invention achieves multi-stage cooling and dust removal by adding a secondary dust collector and a secondary heat exchanger, which significantly improves nitrogen purification and waste heat recovery efficiency, reduces equipment wear, and extends the system's service life.

[0022] In addition, the system is equipped with an activated carbon adsorption tower to further reduce impurities carried by the circulating nitrogen gas.

[0023] The cooling medium in this system is water, which is used to exchange heat and then form steam, which is used as a heat source for other equipment.

[0024] like Figure 1 As shown, an initial heat exchanger is also provided between the primary dust collector and the primary heat exchanger. The nitrogen input end of the initial heat exchanger is connected to the output end of the primary dust collector, the nitrogen output end of the initial heat exchanger is connected to the nitrogen input end of the primary heat exchanger, the cooling medium input end of the initial heat exchanger is connected to the cooling medium output end of the secondary heat exchanger, and the cooling medium output ends of the initial heat exchanger and the primary heat exchanger are respectively connected to the waste heat recovery device.

[0025] Because the nitrogen output from the primary dust collector is at a high temperature, if it directly enters the primary heat exchanger to exchange heat with the low-temperature cooling medium, the temperature difference will be too large, the waste heat recovery will be insufficient, and the equipment will be easily damaged. Therefore, the medium-temperature cooling medium of the secondary heat exchanger is used as the cooling medium of the initial heat exchanger to pre-cool the high-temperature nitrogen output from the primary dust collector, so as to achieve cascade cooling and heat recovery, avoid heat waste, and protect the equipment safety.

[0026] like Figure 2 As shown, the dry quenching furnace includes a furnace body 1. The interior of the furnace body 1 is arranged from top to bottom as a pre-storage section 2, a transition section 3, and a cooling section 4. The transition section 3 is fitted with an annular exhaust channel 5. The periphery of the transition section 3 is provided with exhaust ports that communicate with the exhaust channel 5. The cooling section 4 is provided with an air distribution cap 6. The input end of the air distribution cap 6 is connected to the gas input end of the dry quenching furnace. The solid phase output end of the furnace body 1 is provided with a discharge device.

[0027] like Figure 2 As shown, the discharge device includes a discharge pipe 7 and a vibrator 8. The discharge pipe 7 includes a main body 701 arranged in a horizontal direction. The two ends of the main body are respectively provided with a feed port 702 and a discharge port 703. The directions of the feed port 702 and the discharge port 703 are perpendicular to the main body 701 and opposite to each other. The vibrating end of the vibrator 8 is connected to the end of the main body 701 near the feed port 702 by means of a conductive plate 704.

[0028] The Z-shaped structure of the discharge pipe 7 creates a material drop buffer at the connection between the inlet 702 and the main body 701, preventing the coke from accumulating and clogging quickly, and also preventing the coke from falling and crushing rapidly. The vibrator 8 uses vibration to make the coke in the horizontal main body 701 move at a uniform speed.

[0029] like Figures 2-4 As shown, the inner wall of the cap body 601 of the wind-equalizing cap 6 is provided with a sealing assembly. The sealing assembly includes a swing rod 602, a counterweight cap 603, and a connecting rod 604. The hinged end of the swing rod 602 is hinged to the inner wall of the cap body 601. The counterweight cap 603 is connected to the hinged end of the swing rod 602 via the connecting rod 604. The counterweight cap 603 has the freedom to reciprocate in the vertical direction by means of the blowing of nitrogen gas. The swing rod 602 has the freedom to swing around the hinged end by means of the reciprocating movement of the counterweight cap 603. A plug 605 is also provided on the swing rod 602. A vent 9 is provided on the cap body 601 to seal with the plug 605. The plug 605 has the freedom to seal the vent 9 and move away from the vent 9 by means of the swing of the swing rod 602.

[0030] When nitrogen is introduced from the bottom of the air distribution cap 6, part of the nitrogen flows from the original side outlet 606 to the lower half of the cooling section 4, while the other part pushes the counterweight cap 603 upward. The counterweight cap 603, through the adapter rod 604, drives the swing rod 602 to swing around the hinge end, thereby moving the plug 605 away from the vent 9. Some nitrogen is then ejected upward from the vent 9. Figure 4 As shown, the upper part of the cooling section 4 is covered. Because nitrogen continues to flow into the vent 9, coke powder or debris will not enter the air distribution cap 6. When the cooling gas supply to the cooling section 4 stops, the counterweight cap 603 slides down under gravity, and the swing rod 602 and plug 605 reset, re-blocking the vent 9. Figure 3 As shown, this design prevents coke powder or debris from entering the uniform air distribution cap 6 through the vent 9. Through the design of the sealing assembly and the vent 9, nitrogen is evenly distributed throughout the cooling section 4, solving the problem of incomplete cooling of red-hot coke in the cooling section 4.

[0031] like Figures 2-4 As shown, the counterweight cap 603 has a cap-shaped structure with the opening facing downwards. The counterweight cap 603 is also provided with a guide post 607 and a limiting sleeve 608. The limiting sleeve 608 is fixedly connected to the inner wall of the wind equalization cap 6. The counterweight cap 603 is fixedly connected to the guide post 607. The free end of the adapter rod 604 rests on the top of the guide post 607. The guide post 607 is sleeved with the limiting sleeve 608 and has the freedom to slide along the limiting sleeve 608. When the counterweight cap 603 rises to the limit position, the lower edge of the counterweight cap 603 is flush with the air outlet 606 of the wind equalization cap 6.

[0032] The cap-shaped counterweight 603 can better gather and collect nitrogen gas, ensuring that the thrust of the nitrogen gas can move the counterweight 603. Through the cooperation between the guide post 607 and the limiting sleeve 608, the guide post 607 is restricted to sliding only in the vertical direction, preventing the counterweight 603 from shifting laterally or rotating, ensuring stable transmission between the adapter rod 604 and the swing rod 602. A pulley can also be provided at the end of the adapter rod 604 to reduce friction between the adapter rod 604 and the guide post 607 during lifting. In addition, multiple sets of sealing components are arranged in a ring array around the guide post 607, ensuring that nitrogen gas is evenly distributed along the multiple sets of vents 9 towards the upper half of the cooling section 4.

[0033] like Figure 4 As shown, when the counterweight cap 603 rises to its limit position, its lower edge is flush with the air outlet 606 on the side of the air distribution cap 6. At this time, some of the nitrogen gas overflowing along the periphery of the air distribution cap 6 flows directly to the air outlet 606 under the guidance of the edge of the counterweight cap 603 and enters the side or lower half of the cooling section 4, reducing the flow rate loss of nitrogen gas and thus improving the cooling efficiency.

[0034] like Figures 2-4As shown, a limiting slider 609 is provided on the periphery of the guide post 607, and a limiting groove 610 is provided on the side wall of the limiting sleeve 608 to cooperate with the limiting slider 609. The limiting groove 610 restricts the reciprocating movement of the counterweight cap 603 in the vertical direction.

[0035] The limiting slider 609 prevents the guide post 607 from rotating during its up-and-down sliding, ensuring that the guide post 607 moves vertically. On the other hand, the cooperation between the limiting groove 610 and the limiting slider 609 restricts the highest and lowest positions of the guide post 607. When the counterweight cap 603 rises to its limit position with the guide post 607, the lower edge of the counterweight cap 603 is flush with the side air outlet 606 of the wind equalizer cap 6, and all the plugs 605 on the swing rod 602 are far away from the air vent 9. When the counterweight cap 603 falls to its limit position with the guide post 607, all the plugs 605 on the swing rod 602 precisely block the air vent 9.

[0036] like Figure 6 As shown, the air outlet of the vent 9 has a concave bowl-shaped structure. A protective sleeve 10 is also provided at the vent 9. The protective sleeve 10 is located inside the bowl-shaped structure. The end of the protective sleeve 10 is located below the outer wall surface of the cap 601. When the plug 605 is sealed with the vent 9, the end of the plug 605 is located inside the protective sleeve 10.

[0037] The bowl-shaped structure guides nitrogen gas out of the vent 9 to form a diffused airflow, expanding the nitrogen coverage area. Additionally, the invention includes a protective sleeve 10. When the plug 605 seals the vent 9, its end is located inside the protective sleeve 10. The protective sleeve 10 isolates the sealing surface of the plug 605 from direct erosion by high-temperature red-hot coke and dust, preventing wear or adhesion of the sealing surface. Furthermore, because the plug 605 is located inside the protective sleeve 10, even if the end of the protective sleeve 10 is blocked by coke, the plug 605 can easily reset and seal the vent 9. The sealed protective sleeve 10 can be processed after the coke quenching is complete.

[0038] like Figure 5 As shown, a guide notch 611 is provided at the peripheral edge of the counterweight cap 603, and nitrogen gas passes through the counterweight cap 603 along the guide notch 611 and flows to the vent 9.

[0039] The guide notch 611 corresponds to the position of the vent 9, and can provide an upward channel for some nitrogen to flow to the vent 9, thereby optimizing the nitrogen flow path and improving the gas throughput of the vent 9.

Claims

1. A dry quenching coke system, comprising a dry quenching furnace, a dust removal unit, and a heat exchange unit, wherein nitrogen gas sequentially enters a primary dust collector and a primary heat exchanger along the gas outlet end of the dry quenching furnace, characterized in that, The system also includes a secondary dust collector and a secondary heat exchanger. The nitrogen output end of the primary heat exchanger is connected to the nitrogen input end of the secondary heat exchanger, the nitrogen output end of the secondary heat exchanger is connected to the input end of the secondary dust collector, and the output end of the secondary dust collector is connected to the gas input end of the dry quenching furnace via a circulating pump.

2. The dry quenching system according to claim 1, characterized in that, An initial heat exchanger is also provided between the primary dust collector and the primary heat exchanger. The nitrogen input end of the initial heat exchanger is connected to the output end of the primary dust collector, the nitrogen output end of the initial heat exchanger is connected to the nitrogen input end of the primary heat exchanger, the cooling medium input end of the initial heat exchanger is connected to the cooling medium output end of the secondary heat exchanger, and the cooling medium output ends of the initial heat exchanger and the primary heat exchanger are respectively connected to the waste heat recovery device.

3. The dry quenching system according to claim 1, characterized in that, The dry quenching furnace includes a furnace body (1). The furnace body (1) is provided with a pre-storage section (2), a transition section (3) and a cooling section (4) from top to bottom. The transition section (3) is fitted with an annular exhaust channel (5). The circumference of the transition section (3) is provided with an exhaust port that communicates with the exhaust channel (5). The cooling section (4) is provided with a uniform air cap (6). The input end of the uniform air cap (6) is connected to the gas input end of the dry quenching furnace. The solid phase output end of the furnace body (1) is provided with a discharge device.

4. A dry quenching system according to claim 3, characterized in that, The discharge device includes a discharge pipe (7) and a vibrator (8). The discharge pipe (7) includes a main body (701) arranged in a horizontal direction. The two ends of the main body (701) are respectively provided with a feed port (702) and a discharge port (703). The directions of the feed port (702) and the discharge port (703) are perpendicular to the main body (701) and opposite to the directions of the feed port (702) and the discharge port (703). The vibrating end of the vibrator (8) is connected to the end of the main body (701) near the feed port (702) by means of a conductive plate (704).

5. A dry quenching system according to claim 3, characterized in that, The inner wall of the cap body (601) of the wind-equalizing cap (6) is provided with a sealing assembly. The sealing assembly includes a swing rod (602), a counterweight cap (603), and a connecting rod (604). The hinged end of the swing rod (602) is hinged to the inner wall of the cap body (601). The counterweight cap (603) is connected to the hinged end of the swing rod (602) via the connecting rod (604). The counterweight cap (603) has a vertical direction due to the blowing of nitrogen gas. The swing rod (602) has a degree of freedom to swing about the hinge end by means of the reciprocating movement of the counterweight cap (603). The swing rod (602) is also provided with a plug (605). The cap body (601) is provided with a vent (9) that seals with the plug (605). The plug (605) has a degree of freedom to seal the vent (9) and move away from the vent (9) by means of the swing of the swing rod (602).

6. A dry quenching system according to claim 5, characterized in that, The counterweight cap (603) has a cap-shaped structure with the opening facing downwards. The counterweight cap (603) is also provided with a guide post (607) and a limiting sleeve (608). The limiting sleeve (608) is fixedly connected to the inner wall of the wind equalization cap (6). The counterweight cap (603) is fixedly connected to the guide post (607). The free end of the adapter rod (604) rests on the top of the guide post (607). The guide post (607) is sleeved with the limiting sleeve (608) and has the freedom to slide along the limiting sleeve (608). When the counterweight cap (603) rises to the limit position, the lower edge of the counterweight cap (603) is flush with the air outlet (606) of the wind equalization cap (6).

7. A dry quenching system according to claim 6, characterized in that, The guide post (607) is provided with a limiting slider (609) on its periphery, and the side wall of the limiting sleeve (608) is provided with a limiting groove (610) that cooperates with the limiting slider (609). The limiting groove (610) restricts the reciprocating movement of the counterweight cap (603) in the vertical direction.

8. A dry quenching system according to claim 5, characterized in that, The air outlet of the vent (9) has a concave bowl-shaped structure. A protective sleeve (10) is also provided at the vent (9). The protective sleeve (10) is located inside the bowl-shaped structure. The end of the protective sleeve (10) is located below the outer wall surface of the cap (601). When the plug (605) is sealed with the vent (9), the end of the plug (605) is located inside the protective sleeve (10).

9. A dry quenching system according to claim 5, characterized in that, A guide notch (611) is provided at the peripheral edge of the counterweight cap (603), and nitrogen gas passes through the counterweight cap (603) along the guide notch (611) and flows to the vent (9).

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