Anchoring chain continuous heat treatment device and heat treatment process

Abstract

The present application relates to long chain type steel heat treatment technical field, especially a kind of anchor chain continuous heat treatment device and heat treatment process.A kind of anchor chain continuous heat treatment device, including quenching furnace and tempering furnace, quenching pool is arranged between quenching furnace and tempering furnace, anchor chain transmission equipment is arranged at the both ends of quenching furnace and tempering furnace;The quenching furnace and tempering furnace are separated by refractory cotton screen curtain in preheating section, soaking section and heating section, quenching furnace and tempering furnace are only provided with burner at heating section position;Heat transfer pipeline I is arranged between soaking section and preheating section, preheating section is provided with heat transfer pipeline II, the other end of heat transfer pipeline II is connected plate heat exchanger, after heat exchange, plate heat exchanger is connected heating section from heat transfer pipeline III.The process combines quenching process and tempering process together, more time-saving, increase waste heat recovery utilization system, meet the energy-saving and consumption-reducing industrial policy.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of long chain steel heat treatment, in particular to an anchor chain continuous heat treatment device and heat treatment process. BACKGROUND

[0002] The mooring anchor chain part for a ship needs good corrosion resistance because it is immersed in seawater for a long time, so the anchor chain has high requirements on the organization, and research has found that the organization of the anchor chain can be greatly improved and the corrosion resistance of the anchor chain can be improved after strict quenching and tempering heat treatment.

[0003] The two processes of traditional quenching and tempering treatment, namely quenching and tempering, are two independent heat treatment processes, and in the anchor chain heat treatment workshop, quenching and tempering heat treatment is realized by a heat treatment furnace, that is, quenching treatment is performed by using the heat treatment furnace for a period of time, and when the number of chain parts subjected to quenching treatment reaches a certain amount, the temperature in the furnace is adjusted for tempering heat treatment. In addition, since the heat treatment furnace used is a vertical furnace, the anchor chain is sent to a high place by the conveying equipment and then enters the heat treatment furnace through the top of the heat treatment furnace. Since the height of the heat treatment furnace is generally high, the anchor chain is sent to a high altitude, increasing the difficulty of equipment operation. The traditional anchor chain heat treatment furnace uses electric heating, and neither resistance heating nor induction heating has any waste heat recovery measures. Therefore, the electric heating has high energy consumption and low thermal efficiency, and the electric heating equipment and electric heating elements are prone to damage, resulting in high maintenance cost of the electric heating heat treatment furnace. SUMMARY

[0004] The present application aims to overcome the shortcomings of the prior art and provide an anchor chain continuous heat treatment device and heat treatment process. The process combines the two independent process links of quenching and tempering processes together, saves time, and adds a waste heat recovery system, which can effectively reduce energy consumption and meet the industrial policy of energy saving and consumption reduction.

[0005] To solve the problems in the prior art, the present application discloses an anchor chain continuous heat treatment device, which comprises a quenching furnace and a tempering furnace, a quenching pool is arranged between the quenching furnace and the tempering furnace, anchor chain conveying equipment is arranged at both ends of the quenching furnace and the tempering furnace, the inside of the quenching furnace and the tempering furnace is divided into a preheating section, a soaking section and a heating section by a refractory cotton curtain, and the quenching furnace and the tempering furnace are provided with burners only at the position of the heating section.

[0006] The quenching furnace is divided into a quenching preheating section, a quenching soaking section and a quenching heating section, a quenching heat transfer pipeline I is arranged between the quenching soaking section and the quenching preheating section, a quenching heat transfer pipeline II is arranged on the quenching preheating section, one end of the quenching heat transfer pipeline II is connected to the air inlet end of a plate heat exchanger, and the air outlet end of the plate heat exchanger is connected to the nozzle of the quenching heating section through a quenching heat transfer pipeline III.

[0007] The tempering furnace is divided into a tempering preheating section, a tempering soaking section and a tempering heating section, a tempering heat transfer pipeline I is arranged between the tempering soaking section and the tempering preheating section, the tempering preheating section is provided with a tempering heat transfer pipeline II, one end of the tempering heat transfer pipeline II is connected to an air inlet end of a plate heat exchanger, and an air outlet end of the plate heat exchanger is connected to the tempering heating section through a tempering heat transfer pipeline III.

[0008] The anchor chain is driven by the anchor chain transmission device of the quenching furnace to move in the quenching furnace, sequentially passes through a quenching preheating section, a quenching heating section and a quenching soaking section in the quenching furnace, is then driven by the anchor chain transmission device of the tempering furnace to enter the quenching pool and move in the tempering furnace, and sequentially passes through a tempering preheating section, a tempering heating section and a tempering soaking section in the tempering furnace.

[0009] Preferably, the anchor chain transmission device comprises a rotating shaft tooth, the rotating shaft tooth is driven to rotate by a motor, and the width of the rotating shaft tooth is smaller than the inner diameter of the anchor chain link.

[0010] Preferably, the refractory cotton felt curtain comprises a fixed area and a movable area, the fixed area is fixed to the furnace wall by screws, and a plurality of gaps penetrating from top to bottom are arranged on the refractory cotton felt curtain of the movable area.

[0011] Preferably, the burner at the heating section of the quenching furnace is a direct flame burner.

[0012] Preferably, the burner at the heating section of the tempering furnace is a semi-direct flame-semi-flat flame combined burner, and the quenching furnace and the tempering furnace are both horizontal heat treatment furnaces.

[0013] Preferably, the tempering heat transfer pipeline I between the quenching preheating section and the quenching heating section is connected to the quenching preheating section through four branch pipelines, and the two adjacent branch pipelines are arranged at an interval of 90°; and the tempering heat transfer pipeline I between the tempering preheating section and the tempering heating section is connected to the tempering preheating section through four branch pipelines, and the two adjacent branch pipelines are arranged at an interval of 90°.

[0014] In the heat treatment device, the heat treatment process is shortened, two independent heat treatment processes are combined together, energy is saved, and a large amount of time is saved. The anchor chain is driven by the anchor chain transmission device to move, the shaft tooth on the anchor chain transmission device is inserted into the link of the anchor chain, the anchor chain continuously advances following the continuous rotation of the anchor chain transmission device, and the quenching and tempering treatment are sequentially performed, so that the corrosion resistance of the anchor chain is improved.

[0015] In the quenching process of the anchor chain, the anchor chain sequentially passes through a quenching preheating section, a quenching heating section and a quenching soaking section, the temperature of the anchor chain reaches the highest in the quenching heating section, and fire-resistant cotton felt curtains are arranged between the sections and have a fire-resistant and heat-insulating effect to divide the space of the quenching furnace. Burners are arranged in the quenching heating section and use natural gas as fuel, the quenching soaking section utilizes the temperature of the quenching heating section through heat radiation, and a quenching furnace heat transfer pipeline I is arranged between the quenching soaking section and the quenching furnace preheating section, the flue gas in the quenching soaking section enters the quenching preheating section to preheat the anchor chain. In order to improve the heat transfer efficiency, a fan is arranged in the quenching furnace heat transfer pipeline I, and the fan can promote the flue gas to flow from the quenching soaking section to the quenching preheating section. The flue gas entering the quenching preheating section enters the air inlet end of the plate heat exchanger through the quenching heat transfer pipeline II, and after heat exchange, the air enters the quenching heating section through the quenching heat transfer pipeline III from the air outlet end of the plate heat exchanger as a combustion-supporting agent.

[0016] After the anchor chain leaves the quenching furnace, it enters the quenching pool and then enters the tempering furnace. In the tempering furnace, the anchor chain sequentially passes through a tempering preheating section, a tempering heating section and a tempering soaking section, and the arrangement of the sections and the flue gas running path are consistent with those in the quenching furnace.

[0017] Based on the heat treatment device, the corresponding heat treatment process is as follows: (1) the anchor chain transmission equipment of the quenching furnace continuously rotates, the links of the anchor chain are hooked on the shaft teeth of the anchor chain transmission equipment and are continuously driven to move forward, and sequentially pass through the quenching preheating section, the quenching heating section and the quenching soaking section.

[0018] The burners of the quenching heating section are connected with natural gas, the burners continuously burn to provide heat, a fire-resistant cotton felt curtain is arranged between the quenching heating section and the quenching soaking section, the flue gas carrying heat enters the quenching soaking section from the quenching heating section through the gap of the fire-resistant cotton felt curtain to ensure the temperature of the quenching soaking section; the quenching heat transfer pipeline I is arranged between the quenching soaking section and the quenching preheating section, and the flue gas carrying heat is pumped into the quenching preheating section by the fan.

[0019] The temperature range of the quenching preheating section is 300-400℃, the temperature of the quenching heating section is 920-960℃, and the temperature of the quenching soaking section is 880-900℃.

[0020] (2) the anchor chain transmission equipment of the tempering furnace continuously rotates to drive the anchor chain to sequentially pass through the quenching pool and the preheating section, the heating section and the soaking section of the tempering furnace.

[0021] The burner of the tempering heating section is connected to natural gas, and the tempering heating section continuously burns to provide heat. A refractory cotton felt curtain is set between the tempering soaking section and the tempering heating section. The flue gas carrying heat enters the tempering soaking section from the tempering heating section through the gap of the refractory cotton felt curtain to ensure the temperature of the tempering soaking section; a tempering heat transfer pipe I is set between the tempering soaking section and the tempering preheating section, and the flue gas carrying heat is drawn from the tempering soaking section by the fan into the tempering preheating section.

[0022] The temperature range of the tempering preheating section is: 300-400℃, the temperature of the tempering heating section is: 640-680℃, and the temperature of the tempering soaking section is: 600-640℃.

[0023] (3) The quenching preheating section is provided with a quenching heat transfer pipe II, the other end of which is connected to the air inlet end of the plate heat exchanger. The flue gas carrying heat exchanges heat in the plate heat exchanger. The flue gas after heat exchange enters the quenching heat transfer pipe III from the exhaust end of the plate heat exchanger and then enters the burner of the quenching heating section to be used as a fuel gas combustion aid. After the waste heat is further utilized, the flue gas is discharged from the chimney.

[0024] (4) The tempering furnace preheating section is provided with a tempering heat transfer pipe II, the other end of which is connected to a plate heat exchanger. The flue gas carrying heat exchanges heat in the plate heat exchanger. The flue gas after heat exchange enters the tempering heat transfer pipe III from the exhaust end of the plate heat exchanger and then enters the burner of the tempering heating section, where it is used as a fuel gas combustion aid. After the waste heat is further utilized, the flue gas is discharged from the chimney.

[0025] (5) The anchor chain leaves the tempering furnace and completes the heat treatment.

[0026] Preferably, an inlet pipe is provided on the pipe wall of the quenching and preheating section, and the inlet pipe is connected to the four branch pipes of the quenching and heat transfer pipe I. The inlet pipe is arranged at an angle, and the angle between two adjacent inlet pipes is 90 degrees, so as to form a continuously rotating air curtain between the quenching and preheating section and the quenching and heating section, thereby blocking the transmission of flue gas between the quenching and preheating section and the quenching and heating section.

[0027] An inlet pipe is provided on the tube wall of the tempering preheating section, and the inlet pipe is connected to the four branch pipes of the tempering heat transfer pipe I. The inlet pipe is arranged at an angle, and the angle between two adjacent inlet pipes is 90 degrees, forming a continuously rotating air curtain between the tempering preheating section and the tempering heating section, blocking the flue gas transmission between the quenching preheating section and the quenching heating section.

[0028] The beneficial effects of this process are:

[0029] 1. The process flow is shortened, the quenching process and the tempering process are connected together, and the anchor chain undergoes quenching and tempering treatment in sequence, which shortens the process time, saves the anchor chain transportation time, and improves the efficiency of heat treatment.

[0030] 2. Recycling of waste heat saves energy consumption. In the prior art, all parts of the quenching furnace and the tempering furnace need to be heated, and the flue gas after heating is directly discharged, and the heat dissipates directly into the air. In the present application, the flue gas is made to move completely in the pipeline, which can make full use of the heat. The temperature of the heating section is the highest, the soaking section is the second, and the preheating section has the lowest temperature, so the entire flue gas path is also along the heating section - soaking section - preheating section. The heating section is provided with a burner, and natural gas is burned in the heating section. The temperature of this section is the highest, and through heat radiation, the flue gas enters the soaking section from the heating section, realizing the first utilization of heat, and then enters the preheating section through the heat transfer pipe, and finally exchanges heat through the heat exchanger, preheats the air and enters the heating section to assist combustion.

[0031] 3. The furnace body is partitioned by refractory felt curtains and air curtains to ensure that the temperature range of each section is within the appropriate range. Since the temperature difference between the heating section and the soaking section is not large, the heat convection between the two will not be too strong. Therefore, heat transfer between the two can be achieved only through the flue gas entering through the gap in the active area of ​​the refractory felt curtain. The soaking section needs to maintain a relatively stable temperature, so this slow heat conduction method just meets its requirements. However, the temperature difference between the heating section and the preheating section is large. If there is no barrier between the two, more intense heat convection will inevitably occur. The hot air in the heating section will quickly and continuously flow into the preheating section, causing the preheating section temperature to be too high and the heating section temperature to be too low. To avoid this, the heat transfer pipe between the soaking section and the preheating section is connected to the preheating section through four branch pipes. The inlet pipes of these four pipes are set at an angle on the pipe wall of the preheating section, and are spaced 90 degrees apart. In this way, after the gas enters, a square vortex area will be formed in the preheating section pipe. On the one hand, the heat of the flue gas can be concentrated around the anchor chain to be treated. On the other hand, the tangentially introduced flue gas will form a continuously rotating air curtain under the inertia of the fluid, further blocking the flow of high-temperature gas from the heating section to the preheating section. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of the present invention;

[0033] Figure 2 It is a schematic structural diagram of the refractory curtain in the present invention;

[0034] Figure 3 This is a schematic diagram of the tangential introduction arrangement of the pipeline in the present invention;

[0035] Figure 4 It is a structural schematic diagram of the burner of the tempering furnace in the present invention.

[0036] Reference numerals:

[0037] 1. Quenching furnace; 11. Quenching preheating section; 12. Quenching soaking section; 13. Quenching heating section; 14. Quenching heat transfer pipeline I; 15. Quenching heat transfer pipeline II; 16. Quenching heat transfer pipeline III;

[0038] 2. Tempering furnace; 21. Tempering soaking section; 22. Tempering preheating section; 23. Tempering heating section; 24. Tempering heat transfer pipe I; 25. Tempering heat transfer pipe II; 26. Tempering heat transfer pipe III;

[0039] 3. Quenching tank; 4. Anchor chain transmission equipment; 41. Rotating shaft gear; 5. Refractory cotton felt curtain; 51. Fixed area; 52. Movable area; 53. Notch; 6. Burner; 61. Straight flame burner; 62. Semi-straight flame-semi-flat flame combination burner; 7. Plate heat exchanger; 8. Inlet pipe. DETAILED DESCRIPTION

[0040] The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are not intended to limit the scope of protection of the present invention.

[0041] like Figure 1 As shown, a continuous heat treatment device for anchor chains includes a quenching furnace 1 and a tempering furnace 2, a quenching pool 3 is provided between the quenching furnace 1 and the tempering furnace 2, and anchor chain transmission equipment 4 is provided at both ends of the quenching furnace 1 and the tempering furnace 2. The quenching furnace 1 and the tempering furnace 2 are divided into a preheating section, a soaking section and a heating section by a refractory cotton felt curtain 5. The quenching furnace 1 and the tempering furnace 2 are both provided with a burner 6 only at the heating section.

[0042] The quenching furnace 1 is divided into a quenching preheating section 11, a quenching soaking section 12 and a quenching heating section 13. A quenching heat transfer pipe I 14 is provided between the quenching soaking section 12 and the quenching preheating section 11. A quenching heat transfer pipe II 15 is provided on the quenching preheating section 11. The other end of the quenching heat transfer pipe II 15 is connected to the air inlet end of the plate heat exchanger 7, and the exhaust end of the plate heat exchanger 7 is connected to the nozzle of the quenching heating section 13 through the quenching heat transfer pipe III 16.

[0043] The tempering furnace 2 is divided into a tempering preheating section 22, a tempering soaking section 21 and a tempering heating section 23. A tempering heat transfer pipe I 24 is provided between the tempering soaking section 21 and the tempering preheating section 22. The tempering preheating section 22 is provided with a tempering heat transfer pipe II 25. The other end of the tempering heat transfer pipe II 25 is connected to the air inlet end of the plate heat exchanger 7. The exhaust end of the plate heat exchanger 7 is connected to the tempering heating section 23 through a tempering heat transfer pipe III 26.

[0044] The anchor chain is driven by the anchor chain transmission device 4 of the quenching furnace 1 to move in the quenching furnace 1, and the anchor chain passes through the quenching preheating section 11, the quenching heating section 13 and the quenching soaking section 12 in the quenching furnace 1 in sequence; then it is driven by the anchor chain transmission device 4 of the tempering furnace 2 to enter the quenching pool 3 and move in the tempering furnace 2, and the anchor chain passes through the tempering preheating section 22, the tempering heating section 23 and the tempering soaking section 21 in the tempering furnace 2 in sequence.

[0045] The anchor chain transmission device 4 comprises a rotating shaft tooth 41 , which is driven to rotate by a motor. The width of the rotating shaft tooth 41 is smaller than the inner diameter of the anchor chain link.

[0046] like Figure 2 As shown, the refractory wool felt curtain 5 includes a fixed area 51 and a movable area 52. The fixed area 51 is fixed to the furnace wall by screws, and the refractory wool felt curtain 5 in the movable area 52 is provided with a plurality of notches 53 running through from top to bottom.

[0047] The burner 6 at the heating section of the quenching furnace 1 adopts a straight flame burner 61, and the burner 6 at the heating section of the tempering furnace 2 adopts a semi-straight flame-semi-flat flame combined burner 62. Both the quenching furnace 1 and the tempering furnace 2 are horizontal heat treatment furnaces.

[0048] like Figure 3 As shown, the quenching heat transfer pipe I14 between the quenching preheating section 11 and the quenching heating section 13 is connected to the quenching preheating section 11 through four branch pipes, and two adjacent branch pipes are arranged at 90° intervals; the tempering heat transfer pipe I24 between the tempering preheating section 22 and the tempering heating section 23 is connected to the tempering preheating section 22 through four branch pipes, and two adjacent branch pipes are arranged at 90° intervals.

[0049] This heat treatment device shortens the heat treatment process by combining two independent heat treatment processes, saving energy and considerable time. The anchor chain is driven by the anchor chain transmission device 4, and the shaft teeth on the anchor chain transmission device 4 are inserted into the links of the anchor chain. The anchor chain continuously advances as the anchor chain transmission device 4 rotates, undergoing quenching and tempering treatments in sequence, thereby improving the corrosion resistance of the anchor chain.

[0050] In the quenching process of the anchor chain, the anchor chain sequentially passes through the quenching preheating section 11, the quenching heating section 13 and the quenching soaking section 12, the temperature of the anchor chain reaches the highest in the quenching heating section 13, and the refractory cotton felt curtain 5 is arranged between the sections and has the fireproof and heat insulation effects, thereby partitioning the furnace body space of the quenching furnace 1. The burner 6 is arranged in the quenching heating section 13 and uses natural gas as the fuel, the quenching soaking section 12 utilizes the temperature of the quenching heating section 13 through the heat radiation mode, the quenching heat transfer pipeline I 14 is arranged between the quenching soaking section 12 and the quenching preheating section 11, the flue gas of the quenching soaking section 12 enters the quenching preheating section 11, and the preheating of the anchor chain is realized. In order to improve the heat transfer efficiency, the fan is arranged in the quenching furnace heat transfer pipeline I, and the existence of the fan can promote the flue gas to flow from the quenching soaking section 12 to the quenching preheating section 11. The flue gas entering the quenching preheating section 11 enters the air inlet end of the plate heat exchanger 7 through the quenching heat transfer pipeline II 15, and the air enters the quenching heating section 13 as the combustion-supporting agent from the flue gas outlet end of the plate heat exchanger 7 through the quenching heat transfer pipeline III 16 after heat exchange.

[0051] After the anchor chain leaves the quenching furnace 1, the anchor chain enters the quenching pool 3 and then enters the tempering furnace 2. In the tempering furnace 2, the anchor chain sequentially passes through the tempering preheating section 22, the tempering heating section 23 and the tempering soaking section 21, and the partitioned arrangement and the flue gas running path of the sections are consistent with those in the quenching furnace 1.

[0052] In each heat transfer pipeline, in order to improve the flue gas running direction and the transmission speed in the pipeline, the fan can be installed according to the situation, and the suction direction of the fan is consistent with the flue gas running direction.

[0053] Based on the heat treatment device, the corresponding heat treatment process is as follows: (1) the anchor chain transmission device 4 of the quenching furnace 1 continuously rotates, the chain links of the anchor chain are hooked on the shaft teeth of the anchor chain transmission device 4 and are continuously driven to move forward, and sequentially pass through the quenching preheating section 11, the quenching heating section 13 and the quenching soaking section 12.

[0054] The burner 6 of the quenching heating section 13 is connected with natural gas, the quenching heating section 13 continuously burns to provide heat, the refractory cotton felt curtain 5 is arranged between the quenching heating section 13 and the quenching soaking section 12, the flue gas carrying heat enters the quenching soaking section 12 from the quenching heating section 13 through the gap 53 of the refractory cotton felt curtain 5, and the temperature of the quenching soaking section 12 is ensured; the quenching heat transfer pipeline I 14 is arranged between the quenching soaking section 12 and the quenching preheating section 11, and the flue gas carrying heat is sucked into the quenching preheating section 11 from the quenching soaking section 12 by the fan.

[0055] The temperature interval of the quenching preheating section 11 is 300-400℃, the temperature of the quenching heating section 13 is 920-960℃, and the temperature of the quenching soaking section 12 is 880-900℃.

[0056] (2) the anchor chain conveying device 4 of the tempering furnace 2 rotates continuously, driving the anchor chain to pass through the quenching tank 3 and the preheating section, heating section and soaking section of the tempering furnace 2 in turn.

[0057] The burner 6 of the tempering heating section 23 is connected with natural gas, and the tempering heating section 23 is continuously burning to provide heat. The refractory cotton felt curtain 5 is arranged between the tempering heating section 23 and the tempering soaking section 21, and the flue gas carrying heat enters the tempering soaking section 21 from the gap 53 of the refractory cotton felt curtain 5, so as to ensure the temperature of the tempering soaking section 21. The tempering heat transfer pipeline I 24 is arranged between the tempering soaking section 21 and the tempering preheating section 22, and the flue gas carrying heat is pumped into the tempering preheating section 22 from the tempering soaking section 21.

[0058] The temperature range of the tempering preheating section 22 is 300-400℃, the temperature of the tempering heating section 23 is 640-680℃, and the temperature of the tempering soaking section 21 is 600-640℃.

[0059] (3) The quenching preheating section 11 is provided with the quenching heat transfer pipeline II 15, the other end of the quenching heat transfer pipeline II 15 is connected with the gas inlet end of the plate heat exchanger 7, the flue gas carrying heat is heat-exchanged in the plate heat exchanger 7, the heat-exchanged flue gas enters the quenching heat transfer pipeline III 16 from the gas outlet end of the plate heat exchanger 7, and then enters the burner 6 of the quenching heating section 13 to be used as a combustion-supporting agent. After the waste heat is further utilized, the flue gas is discharged from the chimney.

[0060] (4) The tempering preheating section of the tempering furnace 2 is provided with the tempering heat transfer pipeline II 25, the other end of the tempering heat transfer pipeline II 25 is connected with the plate heat exchanger 7, the flue gas carrying heat is heat-exchanged in the plate heat exchanger 7, the heat-exchanged flue gas enters the tempering heat transfer pipeline III 26 from the gas outlet end of the plate heat exchanger 7, and then enters the burner 6 of the tempering heating section 23 to be used as a combustion-supporting agent. After the waste heat is further utilized, the flue gas is discharged from the chimney.

[0061] (5) The anchor chain leaves the tempering furnace 2 and completes the heat treatment.

[0062] The pipe wall of the quenching preheating section 11 is provided with the guide pipeline 8, the guide pipeline 8 is connected with the four branch pipelines of the quenching heat transfer pipeline I 14, the guide pipeline 8 is inclinedly arranged, and adjacent two guide pipelines 8 are 90°, so as to form a continuously rotating air curtain between the quenching preheating section 11 and the quenching heating section 13, and block the flue gas transmission between the quenching preheating section 11 and the quenching heating section 13.

[0063] The pipe wall of the tempering preheating section 22 is provided with an introduction pipeline 8, the introduction pipeline 8 is connected with four branch pipelines of the tempering heat transfer pipeline I 24, the introduction pipeline 8 is arranged obliquely, and adjacent two introduction pipelines 8 are 90°, a continuous rotating air curtain is formed between the tempering preheating section 22 and the tempering heating section 23, and the smoke gas transmission of the quenching preheating section 11 and the quenching heating section 13 is blocked.

[0064] The process has the beneficial effects that (1) the process flow is shortened, the quenching process and the tempering process are connected together, the anchor chain sequentially passes through the quenching and the tempering treatment, the process treatment time is shortened, the anchor chain conveying time is saved, and the heat treatment efficiency is improved. (2) The waste heat is recycled and utilized, and the energy consumption is saved. In the prior art, each part in the quenching furnace 1 and the tempering furnace 2 needs to be heated, and the smoke gas after heating is directly discharged, and the heat directly escapes in the air. In the present application, the smoke gas completely moves in the pipeline, and the heat can be fully utilized. The temperature of the heating section is the highest, the temperature of the soaking section is the second, and the temperature of the preheating section is the lowest, so the walking path of the whole smoke gas is along the heating section, the soaking section and the preheating section. The heating section is provided with a burner 6, and the natural gas is combusted in the heating section. The temperature of this section is the highest, the smoke gas enters the soaking section from the heating section through heat radiation, and the heat is utilized for the first time. Then the smoke gas enters the preheating section through the heat transfer pipeline again, and finally the heat is exchanged through the heat exchanger to preheat the air entering the heating section for combustion. (3) The furnace body is divided into zones through the fire-resistant cotton felt curtain 5 and the air curtain, and the temperature interval of each zone is ensured to be in a suitable range. Since the temperature difference between the heating section and the soaking section is not large, the heat convection between the two is not too strong, so the smoke gas entering through the gap 53 of the movable zone 52 of the fire-resistant cotton felt curtain 5 can realize heat transfer between the two. The soaking section needs to keep the temperature relatively stable, so this slow heat conduction mode meets the requirement. The temperature difference between the heating section and the preheating section is large, and if there is no blockage between the two, a strong heat convection will occur. The hot air in the heating section will quickly and continuously flow into the preheating section, causing the temperature of the preheating section to be too high and the temperature of the heating section to be too low. To avoid this situation, the heat transfer pipeline between the soaking section and the preheating section is connected to the preheating section through four branch pipelines. The introduction pipelines of the four pipelines on the pipe wall of the preheating section are arranged obliquely, and the two pipelines are spaced 90° apart. After the gas enters, a square rotating flow zone is formed in the preheating section pipeline. On the one hand, the heat of the smoke gas can be gathered around the anchor chain to be treated, and on the other hand, the tangentially introduced smoke gas will form a continuous rotating air curtain under the fluid inertia, further blocking the flow of high-temperature gas from the heating section to the preheating section.

[0065] It should be noted that the movable area 52 of the refractory cotton curtain 5 is provided with a plurality of downwardly penetrating notches 53, which is similar to a plurality of curtain pieces fixed at the top and freely movable at the bottom. In this way, the anchor chain can be conveniently passed through, and the heat transfer can be blocked, so that the division of each section is more obvious. Avoiding the whole furnace body to become a whole, the flue gas escapes from the heating section to the preheating section, causing the heating section temperature to be not high enough, and the preheating section temperature to be not low enough, affecting the heat treatment effect. In order to ensure the temperature in the furnace body, refractory cotton curtains 5 can also be provided at both ends of the furnace body to prevent external cold air from entering and internal hot air from escaping.

[0066] In this application, in order to improve the temperature in the quenching furnace which is higher than that of the tempering furnace 2, the straight flame burner 61 is used for the burner 6 in the quenching heating section 13, which has good flame rigidity. Four rows of burners 6 can be uniformly arranged on the pipe wall of the quenching heating section 13 in the axial direction, and the arrangement mode of the burners 6 is the same as that of the introduction pipe 8 of the quenching preheating section 11, that is, four burners 6 in each row, with a 90° angle between adjacent two burners 6, and the burners 6 are inclined to place, so as to facilitate the flame to surround the square shape, and the anchor chain to be treated located at the center of the square is in the high temperature area of the flame center, which is better in heating condition and improves the heat utilization efficiency.

[0067] As shown in the drawings, Figure 4 The temperature in the tempering furnace 2 is lower, and the semi-straight flame-semi-flat flame burner 62 is used for the burner 6 in the tempering heating section 23, which can relatively gather the high-temperature flue gas around the anchor chain to be treated, and also can ensure that the temperature of the flue gas is relatively uniform. The arrangement mode can also be consistent with that of the burner 6 in the quenching heating section 13, so as to improve the heat utilization efficiency, and when four burners are arranged, the semi-flat flame part faces the center of the furnace body in the radial direction.

[0068] Considering the influence of high-temperature gas floating on the temperature field on the furnace body interface, the center of the square rotating flow area formed by the flame jet from the burner 6 can be moved downward by changing the length of the burner 6. Through actual application in the workshop, it is appropriate that the center of the rotating flow area moves downward by 1 / 4 of the radius length of the furnace body.

[0069] The above only describes the preferred embodiments of the present application, and it should be noted that those skilled in the art can make some improvements and modifications without departing from the technical principles of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.

Claims

1. An anchor chain continuous heat treatment device, comprising a quenching furnace and a tempering furnace, characterized in that: A quenching pool is provided between the quenching furnace and the tempering furnace. Anchor chain transmission equipment is provided at both ends of the quenching furnace and the tempering furnace. The quenching furnace and the tempering furnace are divided into a preheating section, a soaking section and a heating section by a refractory cotton felt curtain. The quenching furnace and the tempering furnace are only provided with a burner at the heating section. The quenching furnace is divided into a quenching preheating section, a quenching soaking section and a quenching heating section. A quenching heat transfer pipe I is provided between the quenching soaking section and the quenching preheating section. A quenching heat transfer pipe II is provided on the quenching preheating section. The other end of the quenching heat transfer pipe II is connected to the air inlet end of the plate heat exchanger, and the exhaust end of the plate heat exchanger is connected to the nozzle of the quenching heating section through the quenching heat transfer pipe III. The tempering furnace is divided into a tempering preheating section, a tempering soaking section and a tempering heating section. A tempering heat transfer pipe I is provided between the tempering soaking section and the tempering preheating section. A tempering heat transfer pipe II is provided in the tempering preheating section. The other end of the tempering heat transfer pipe II is connected to the air inlet end of the plate heat exchanger. The exhaust end of the plate heat exchanger is connected to the nozzle of the tempering heating section through the tempering heat transfer pipe III. The anchor chain is driven by the anchor chain transmission equipment of the quenching furnace to move in the quenching furnace, and the anchor chain passes through the quenching preheating section, the quenching heating section and the quenching soaking section in the quenching furnace in sequence; then it is driven by the anchor chain transmission equipment of the tempering furnace into the quenching pool and moves in the tempering furnace, and the anchor chain passes through the tempering preheating section, the tempering heating section and the tempering soaking section in the tempering furnace in sequence; the anchor chain transmission equipment includes a rotating shaft tooth, and the rotating shaft tooth is driven to rotate by a motor, and the width of the rotating shaft tooth is smaller than the inner diameter of the anchor chain link; the refractory cotton felt curtain includes a fixed area and a movable area, and the fixed area is fixed to the furnace wall by screws, and the refractory cotton felt curtain in the movable area is provided with a plurality of notches running through from top to bottom; Among them, the temperature range of the quenching preheating section is: 300-400℃, the temperature of the quenching heating section is: 920-960℃, and the temperature of the quenching soaking section is: 880-900℃; Among them, the temperature range of the quenching preheating section is: 300-400℃, the temperature of the quenching heating section is: 920-960℃, and the temperature of the quenching soaking section is: 880-900℃; An inlet pipe is provided on the pipe wall of the quenching and preheating section, and the inlet pipe is connected to the four branch pipes of the quenching and heat transfer pipe I. The inlet pipe is arranged at an angle, and the angle between two adjacent inlet pipes is 90 degrees, forming a continuously rotating air curtain between the quenching and preheating section and the quenching and heating section, thereby blocking the transmission of flue gas from the quenching and preheating section and the quenching and heating section; An inlet pipe is provided on the tube wall of the tempering preheating section, and the inlet pipe is connected to the four branch pipes of the tempering heat transfer pipe I. The inlet pipe is arranged at an angle, and the angle between two adjacent inlet pipes is 90 degrees, forming a continuously rotating air curtain between the tempering preheating section and the tempering heating section, blocking the flue gas transmission between the quenching preheating section and the quenching heating section.

2. The anchor chain continuous heat treatment device according to claim 1, characterized in that: The burner at the heating section of the quenching furnace adopts a straight flame burner.

3. The anchor chain continuous heat treatment device according to claim 2, characterized in that: The burner of the heating section of the tempering furnace adopts a semi-straight flame-semi-flat flame combined burner.

4. The anchor chain continuous heat treatment device according to claim 2 or 3, characterized in that: The quenching furnace and the tempering furnace are both horizontal heat treatment furnaces.

5. The heat treatment process using the anchor chain continuous heat treatment device according to claim 4 is characterized in that: (1) The anchor chain transmission device of the quenching furnace rotates continuously, and the chain links of the anchor chain are hooked on the shaft teeth of the anchor chain transmission device and driven to move forward continuously, passing through the quenching preheating section, quenching heating section and quenching soaking section in sequence; The burner of the quenching and heating section is connected to natural gas, which is continuously burned in the quenching and heating section to provide heat. A refractory cotton felt curtain is set between the quenching and soaking section and the quenching and heating section. The flue gas carrying heat enters the quenching and soaking section from the quenching and soaking section through the gap of the refractory cotton felt curtain, thereby ensuring the temperature of the quenching and soaking section. A quenching heat transfer pipe I is set between the quenching and soaking section and the quenching preheating section. The flue gas carrying heat is pumped from the quenching and soaking section to the quenching preheating section by the fan. The temperature range of the quenching preheating section is: 300-400℃, the temperature of the quenching heating section is: 920-960℃, and the temperature of the quenching soaking section is: 880-900℃; (2) The anchor chain transmission equipment of the tempering furnace rotates continuously, driving the anchor chain to pass through the quenching pool and the preheating section, heating section and soaking section of the tempering furnace in turn; The burner of the tempering heating section is connected to natural gas, which continuously burns in the tempering heating section to provide heat. A refractory cotton felt curtain is set between the tempering soaking section and the tempering heating section. The flue gas carrying heat enters the tempering soaking section from the tempering heating section through the gap in the refractory cotton felt curtain, thereby ensuring the temperature of the tempering soaking section. A tempering heat transfer pipe I is set between the tempering soaking section and the tempering preheating section. The flue gas carrying heat is pumped from the tempering soaking section to the tempering preheating section by the fan. The temperature range of the tempering preheating section is: 300-400℃, the temperature of the tempering heating section is: 640-680℃, and the temperature of the tempering soaking section is: 600-640℃; (3) The quenching preheating section is provided with a quenching heat transfer pipe II, the other end of which is connected to the air inlet end of the plate heat exchanger. The flue gas carrying heat exchanges heat in the plate heat exchanger. After the heat exchange, the heated air enters the quenching heat transfer pipe III from the exhaust end of the plate heat exchanger and then enters the burner of the quenching heating section to be used as a fuel gas combustion aid. The flue gas after the waste heat is further utilized is discharged from the chimney; (4) The tempering furnace preheating section is provided with a tempering heat transfer pipe II, the other end of which is connected to the air inlet end of the plate heat exchanger. The flue gas carrying heat exchanges heat in the plate heat exchanger. After the heat exchange, the heated air enters the tempering heat transfer pipe III from the exhaust end of the plate heat exchanger and then enters the burner of the tempering heating section to be used as a fuel gas combustion aid. The flue gas after the waste heat is further utilized is discharged from the chimney; (5) The anchor chain leaves the tempering furnace and completes the heat treatment.

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