Area and angle adjustable process gas inlet system of gas-based shaft furnace

Abstract

The invention relates to an area and angle adjustable process gas inlet system of a gas-based shaft furnace, and belongs to the technical field of air supply systems of gas-based shaft furnaces. According to the technical scheme, a plurality of process gas tuyeres (7) are formed in the circumferential direction of a gas-based shaft furnace reactor (1), each process gas tuyere (7) is of an integrated structure formed by connecting an inner sleeve (7003) and an outer sleeve (7004), a water cooling circulation system is formed between the inner sleeve (7003) and the outer sleeve (7004), a flange (7002) is arranged at one end of the inner sleeve (7003) and one end of the outer sleeve (7004), and the other end of the inner sleeve (7003) and the other end of the outer sleeve (7004) are connected with the water cooling circulation system. The included angle alpha between the center line of the flange (7002) and the center line of the inner sleeve (7003) is 3-8 degrees; and each process gas tuyere (7) is connected with a process gas straight pipe (6) through a flange (7002). The device has the beneficial effects that the air inlet area and the air inlet angle of the process gas of the gas-based shaft furnace can be flexibly adjusted, and the process and production requirements are met.

Description

Technical Field

[0001] The invention relates to a process gas inlet system with adjustable area and angle for a gas-based vertical furnace, belonging to the technical field of gas-based vertical furnace air supply systems in the metallurgical industry. Background Art

[0002] The process gas inlet system of a gas-based vertical furnace is usually built with a variety of refractory brick linings inside the vertical furnace shell, and a pre-designed fixed channel is reserved. The process gas enters the lower part of the vertical furnace reactor through the reserved channel. Once the gas-based vertical furnace air inlet channel is completed, the process gas inlet area and angle used for the reduction reaction are fixed and cannot be changed during the production process. However, during the production process of the gas-based vertical furnace, the process gas inlet characteristics of the lower part of the reactor are the main control parameters of the reduction reaction, and its process gas inlet area and inlet angle have an important influence on the reduction process. Therefore, designing an inlet system that can adjust the process gas inlet area and inlet angle has become an important issue that needs to be urgently solved in the direct reduction ironmaking production of the gas-based vertical furnace. Summary of the invention

[0003] The purpose of the present invention is to provide a process gas inlet system with adjustable area and angle for a gas-based vertical furnace, which can realize flexible adjustment of the process gas inlet area and inlet angle of the gas-based vertical furnace, meet process and production requirements, and solve the problems existing in the background technology.

[0004] The technical solution of the present invention is: A process gas inlet system with adjustable area and angle for a gas-based vertical furnace comprises a gas-based vertical furnace reactor, a process gas ring pipe, a process gas branch pipe, a process gas straight pipe and a process gas tuyere. A plurality of process gas tuyere are arranged in the circumferential direction of the gas-based vertical furnace reactor. The process gas tuyere is an integral structure formed by connecting an inner sleeve and an outer sleeve. A water cooling circulation system is formed between the inner sleeve and the outer sleeve. Flanges are arranged at one end of the inner sleeve and the outer sleeve. The angle α between the center line of the flange and the center line of the inner sleeve is 3° to 8°. Each process gas tuyere is connected to a process gas straight pipe via a flange. A peephole is arranged at the other end of the process gas straight pipe. Each process gas straight pipe is connected to the process gas ring pipe via a process gas branch pipe.

[0005] The process gas tuyere is fixed to a hole reserved on the outer wall of the gas-based vertical furnace through a support.

[0006] A spring tensioning device is provided between the process gas straight pipe and the process gas tuyere, and the spring tensioning device comprises a star nut, a fixed support, a movable pull rod, a spring, a guide cylinder, a guide slide, a fixed pull rod and a connecting frame. The movable pull rod is fixed to the process gas straight pipe through the fixed support, one end of the movable pull rod is threadedly connected to the star nut, and the other end of the movable pull rod is connected to the guide slide. The guide slide is arranged in the guide cylinder, and a spring matching the guide slide is also provided in the guide cylinder; one end of the fixed pull rod is connected to the guide cylinder, and the other end of the fixed pull rod is hinged to the outer wall of the gas-based vertical furnace through the connecting frame.

[0007] End covers are respectively provided at both ends of the guide cylinder in the spring tensioning device.

[0008] The fixed support is fixed on the process gas straight pipe, and a through hole matching with the movable pull rod is arranged on the fixed support.

[0009] An oxygen injection gun connected to the process gas straight pipe is arranged near the process gas tuyere.

[0010] The spray angle of the oxygen spray gun and the center line of the process gas straight pipe are 30 degrees.

[0011] The process gas straight pipe is in a horizontal state, the process gas branch pipe is in an inclined state, one end of the process gas branch pipe is connected to the process gas straight pipe, and the other end of the process gas branch pipe is connected to the process gas ring pipe.

[0012] The process gas branch pipe is formed by connecting a plurality of short pipes through a bellows compensator.

[0013] The beneficial effects of the present invention are: completely changing the current situation that the air supply parameters of the existing gas-based vertical furnace cannot be adjusted during the entire furnace service life, achieving the purpose of flexibly adjusting the process gas inlet area and inlet angle of the gas-based vertical furnace according to production requirements, and meeting process and production requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall installation structure of the present invention; Figure 2 It is a cross-sectional view of the present invention; Figure 3 It is a schematic diagram of the compensator of the present invention; Figure 4 This is a schematic diagram of the process gas tuyere of the present invention; Figure 5 It is a schematic diagram of the spring tensioning device of the present invention; In the figure: gas-based vertical furnace reactor 1, process gas main pipe 2, process gas ring pipe 3, process gas bell mouth 4, process gas branch pipe 5, process gas straight pipe 6, process gas tuyere 7, oxygen injection gun 8, oxygen injection gun holster 9, peephole 10, pull rod device 11, spring tensioning device 12, support 13; Gas-based shaft furnace outer wall 101; Upper bellows compensator 501, process gas upper branch pipe 502, lower bellows compensator 503, process gas lower branch pipe 504; Upper flange 5001, nut 5002, stud 5003, bellows 5004, lower flange 5005, upper guide pipe 5006, refractory lining 5007, lower guide pipe 5008, ceramic fiber wool 5009, ring plate 5010; Water inlet 7001, flange 7002, inner sleeve 7003, outer sleeve 7004, guide plate 7005, air inlet channel 7006; Star nut 1201, washer 1202, fixed support 1203, movable pull rod 1204, nut 1205, bolt 1206, end cover 1207, spring 1208, guide cylinder 1209, guide slide 1210, fixed pull rod 1211, pin shaft 1212, pin plate 1213, connecting frame 1214; DETAILED DESCRIPTION

[0015] The present invention will be further described below by way of examples with reference to the accompanying drawings.

[0016] See attached Figure 1-5 A process gas inlet system with adjustable area and angle for a gas-based vertical furnace comprises a gas-based vertical furnace reactor 1, a process gas ring pipe 3, a process gas branch pipe 5, a process gas straight pipe 6 and a process gas tuyere 7. A plurality of process gas tuyere 7 are arranged in the circumferential direction of the gas-based vertical furnace reactor 1. The process gas tuyere 7 is an integrated structure formed by connecting an inner sleeve 7003 and an outer sleeve 7004. A water cooling circulation system is formed between the inner sleeve 7003 and the outer sleeve 7004. A flange 7002 is arranged at one end of the inner sleeve 7003 and the outer sleeve 7004. The angle α between the center line of the flange 7002 and the center line of the inner sleeve 7003 is 3° to 8°; each process gas tuyere 7 is connected to a process gas straight pipe 6 through a flange 7002, and a peephole 10 is arranged at the other end of the process gas straight pipe 6; each process gas straight pipe 6 is connected to a process gas ring pipe 3 through a process gas branch pipe 5.

[0017] In this embodiment, refer to the attached Figure 1-5 , (1) The process gas heated by the heating furnace enters the process gas ring pipe 3 from the process gas main pipe 2. The process gas main pipe 2 and the process gas ring pipe 3 have the same pipe diameter. The outside is welded and the inner wall is sprayed with 50mm high-aluminum spray paint; (2) The process gas ring pipe 3 is arranged at an appropriate upper position along the circumference of the gas-based vertical furnace reactor 1. The process gas ring pipe 3 opens downward uniformly along the circumferential direction. In this example, there are 10 openings, which are respectively connected to the upper ends of the process gas bell mouth 4. In this example, the upper end diameter of the process gas bell mouth 4 is DN800mm, and the lower end diameter is DN500. The outer shell is made of Q275 steel plate with a wall thickness of 10mm. The inner wall is sprayed with 50mm high-aluminum spray paint. The lower end of the process gas bell mouth 4 is connected to the upper end flange of the upper bellows compensator 501.

[0018] (3) An upper guide pipe 5006 and a lower guide pipe 5008 are arranged between the upper bellows compensator 501 and the lower bellows compensator 503. The upper guide pipe 5006 and the lower guide pipe 5008 are arranged alternately. The inner side of the upper guide pipe 5006 is sprayed with a refractory lining 5007, and the refractory lining 5007 is a 50mm high-aluminum spray material. The bellows 5004 is fixedly welded to the upper flange 5001 and the lower flange 5005 by a ring plate 5010. Ceramic fiber cotton 5009 is arranged between the upper guide pipe 5006 and the lower guide pipe 5008 and the bellows 5004. During operation, the ceramic fiber cotton 5009 can effectively prevent high temperature from being transmitted to the bellows 5004, ensuring the normal operation of the bellows compensator.

[0019] (4) The lower end flange of the upper bellows compensator 501 is connected to the upper end flange of the process gas upper branch pipe 502, and the lower end flange of the process gas upper branch pipe 502 is connected to the upper end flange of the lower bellows compensator 503.

[0020] (5) The lower end flange of the lower bellows compensator 503 is connected to the upper end flange of the process gas lower branch pipe 504, and the lower end flange of the process gas lower branch pipe 504 is connected to the upper end flange of the process gas straight pipe 6.

[0021] (6) The front end of the process gas straight pipe 6 extends into the gas-based vertical furnace reactor 1 and is connected to the process gas tuyere 7 with a water cooling jacket.

[0022] (7) An elbow is provided at the rear end of the process gas straight pipe 6. The elbow and the process gas straight pipe 6 are designed as an integrated whole. This design avoids the problem of uneven force on the contact surface of the elbow and the process gas straight pipe 6 due to high temperature and high pressure during the production process, which may lead to air leakage accidents, thereby ensuring safe production.

[0023] (8) In order to increase the process gas temperature at the process gas inlet of the vertical furnace reactor, an oxygen injection gun 8 for partial combustion is set at the process gas straight pipe 6. The oxygen injection gun 8 is set near the front end outlet of the process gas straight pipe 6 and inserted into the oxygen injection gun sleeve 9 reserved by the process gas straight pipe 6 at an insertion angle of 30°. Oxygen is injected by the oxygen injection gun 8. The amount of oxygen can be controlled by the flow regulating valve set on its oxygen main pipe. The injected oxygen meets the high-temperature process gas and partial combustion occurs. The reaction equation is as follows: 2H2 + O2 → 2H2O 2CH4 + O2 → 2CO + 4H2 CH4 + H2O → CO +3H2 CO2 + H2 → CO + H2O (9) Since the reduction of iron ore is an endothermic process, increasing the temperature can improve the production efficiency of the vertical furnace reactor. At the same time, the coke oven gas reforming process also requires high temperature. The partial combustion of oxygen injected by the oxygen injection gun 8 can not only generate heat energy, but also increase the oxidant ratio. Therefore, the partial combustion here produces good results in the gas-based vertical furnace production process, providing the required high temperature environment for the coke oven gas reforming reaction and the iron ore reduction reaction, thereby increasing the direct reduced iron output and reducing the reducing gas consumption.

[0024] (10) A peephole 10 is provided at the lower end of the elbow of the process gas straight pipe 6. The lens of the peephole 10 is made of high-purity silicon dioxide heat-resistant glass and is controlled by a stopcock. The technical operator can observe the working conditions of the front end of the process gas tuyere 7 inside the vertical furnace reactor 1 by using a special tuyere observation lens to understand the iron ore reduction process inside the vertical furnace reactor.

[0025] (11) Since the front end of the process gas tuyere 7 works at the highest temperature part inside the gas-based vertical furnace reactor 1, which is as high as 1000°C or more, long-term operation at this high temperature requires auxiliary cooling to extend the service life of the process gas tuyere 7, so the process gas tuyere 7 is cooled with a water cooling jacket. The process gas tuyere 7 includes a water inlet 7001, a flange 7002, an inner sleeve 7003, an outer sleeve 7004, and a guide plate 7005, such as Figure 4 As shown, the flange 7002, the inner sleeve 7003, the outer sleeve 7004 and the guide plate 7005 together form an annularly connected internal cavity. During operation, cooling water enters from the water inlet 7001 and comes out from the water outlet. The water outlet is not marked in the figure. The water outlet is set at a distance of about 1 / 4 arc length from the water inlet 7001 to achieve circulating cooling of the process gas tuyere 7; the angle α between the center line of the air inlet channel 7006 and the center line of the flange 7002 is 3°~8°, and the process gas tuyere 7 is made of copper-steel composite material and is cast in one time. The air inlet area and air inlet angle of the air inlet channel 7006 are determined according to the process requirements before casting to make spare parts of process gas tuyere 7 of different models.

[0026] (12) One end of the pull rod device 11 is hingedly connected to the outer wall 101 of the gas-based vertical furnace, and the other end is connected to the process gas lower branch pipe 504 through bolts and nuts, which plays the role of fixing the position of the overall air supply device and stabilizing the connection.

[0027] (13) The spring tensioning device 12 includes a star nut 1201, a washer 1202, a fixed support 1203, a movable pull rod 1204, a nut 1205, a bolt 1206, an end cover 1207, a spring 1208, a guide cylinder 1209, a guide slide 1210, a fixed pull rod 1211, a pin shaft 1212, a pin plate 1213, and a connecting frame 1214. Figure 5 As shown. One end of the movable rod 1204 is threaded and passes through the star nut 1201, the gasket 1202 and the fixed support 1203 on the process gas straight pipe 6. The other end of the movable rod 1204 is not threaded and extends into the guide cylinder 1209. The guide cylinder 1209 is a cylindrical structure with flanges at both ends, and is connected to the end cover 1207 and the base 1211 through bolts 1206 and nuts 1205. A spring 1208 is arranged in the guide cylinder 1209. The unthreaded end of the movable rod 1204 is in the guide cylinder 1207 and passes through the spring 1208. The unthreaded end of the movable rod 1204 is welded with a guide slide 1210. One end of the spring 1208 abuts against the end cover 1207, and the other end abuts against the guide slide 1210. One end of the fixed pull rod 1211 is fixed to one end cover 1207 , and the other end is connected to one end of a connecting frame 1214 through a pin shaft 1212 and a pin plate 1213 . The other end of the connecting frame 1214 is hingedly connected to the outer wall 101 of the gas-based vertical furnace.

[0028] (14) When replacing the process gas tuyere 7, it is necessary to rotate the star nut 1201 so that the movable pull rod 1204 and the guide slide 1210 slide along the inner wall of the guide cylinder 1209, and the spring 1208 is extended or compressed, so that the elastic force of the spring 1208 can press and seal the front end of the process gas straight pipe 6 and the rear end flange 7002 of the process gas tuyere 7.

[0029] (15) If the gas-based vertical furnace production and quality requirements are greatly adjusted, it is necessary to change the process gas inlet area and inlet angle of the gas-based vertical furnace reactor. After the gas-based vertical furnace is shut down, the process gas straight pipe 6 and the process gas tuyere 7 are removed by operating the spring tensioning device 12, and then the process gas tuyere 7 of different areas and angles are replaced, thereby achieving the purpose of adjusting the process gas inlet area and inlet angle of the gas-based vertical furnace.

[0030] (16) During the specific implementation process, the process gas heated by the heating furnace enters the process gas ring pipe 3 from the process gas main pipe 2, and then passes through the process gas bell mouth 4, the upper bellows compensator 501, the process gas upper branch pipe 502, the lower bellows compensator 503, the process gas lower branch pipe 504, and then passes through the process gas straight pipe 6 and the process gas tuyere 7 to enter the gas-based vertical furnace reactor 1, and completes the reduction production process with the iron ore inside the gas-based vertical furnace reactor 1. Implementation Effect

[0031] After the implementation of this invention, the current situation that the air supply parameters of the existing gas-based vertical furnace cannot be adjusted during the entire service life of the furnace has been completely changed, and the purpose of flexibly adjusting the process gas inlet area and inlet angle of the gas-based vertical furnace according to production requirements has been achieved, thus meeting the process and production requirements.

Claims

1. A process gas inlet system with adjustable area and angle for a gas-based vertical furnace, characterized in that: The invention comprises a gas-based vertical furnace reactor (1), a process gas ring pipe (3), a process gas branch pipe (5), a process gas straight pipe (6) and a process gas tuyere (7). A plurality of process gas tuyere (7) are arranged in the circumferential direction of the gas-based vertical furnace reactor (1). The process gas tuyere (7) is an integrated structure formed by connecting an inner sleeve (7003) and an outer sleeve (7004). A water cooling circulation system is formed between the inner sleeve (7003) and the outer sleeve (7004). A flange (7002) is provided at one end of (7004), and the angle α between the center line of the flange (7002) and the center line of the inner sleeve (7003) is 3° to 8°; each process gas tuyere (7) is connected to a process gas straight pipe (6) through the flange (7002), and the other end of the process gas straight pipe (6) is provided with a peephole (10); each process gas straight pipe (6) is connected to the process gas ring pipe (3) through a process gas branch pipe (5).

2. A process gas inlet system with adjustable area and angle for a gas-based vertical furnace according to claim 1, characterized in that: The process gas tuyere (7) is fixed to a hole reserved on the outer wall of the gas-based vertical furnace via a support (13).

3. A process gas inlet system with adjustable area and angle for a gas-based vertical furnace according to claim 2, characterized in that: A spring tensioning device (12) is provided between the process gas straight pipe (6) and the process gas tuyere (7), and the spring tensioning device (12) comprises a star nut (1201), a fixed support (1203), a movable pull rod (1204), a spring (1208), a guide cylinder (1209), a guide slide (1210), a fixed pull rod (1211) and a connecting frame (1214), wherein the movable pull rod (1204) is fixed to the process gas straight pipe (6) via the fixed support (1203), and the movable pull rod (120 4) is threadedly connected to a star nut (1201), the other end of the movable pull rod (1204) is connected to a guide slide (1210), the guide slide (1210) is arranged in a guide cylinder (1209), and a spring (1208) matching the guide slide (1210) is also arranged in the guide cylinder (1209); one end of the fixed pull rod (1211) is connected to the guide cylinder (1209), and the other end of the fixed pull rod (1211) is hinged to the outer wall (101) of the gas-based vertical furnace through a connecting frame (1214).

4. The process gas inlet system with adjustable area and angle for a gas-based vertical furnace according to claim 3, characterized in that: End covers (1207) are respectively provided at both ends of the guide cylinder (1209) in the spring tensioning device (12).

5. The process gas inlet system with adjustable area and angle for a gas-based vertical furnace according to claim 3, characterized in that: The fixed support (1203) is fixed on the process gas straight pipe (6), and a through hole matching the movable pull rod (1204) is provided on the fixed support (1203).

6. The process gas inlet system with adjustable area and angle for a gas-based vertical furnace according to claim 1, characterized in that: The process gas straight pipe (6) is provided with an oxygen injection gun (8) connected to the process gas straight pipe (6) near the process gas tuyere (7).

7. A process gas inlet system with adjustable area and angle for a gas-based vertical furnace according to claim 6, characterized in that: The included angle between the spray angle of the oxygen spray gun (8) and the center line of the process gas straight pipe (6) is 30°.

8. The process gas inlet system with adjustable area and angle for a gas-based vertical furnace according to claim 1, characterized in that: The process gas straight pipe (6) is in a horizontal state, the process gas branch pipe (5) is in an inclined state, one end of the process gas branch pipe (5) is connected to the process gas straight pipe (6), and the other end of the process gas branch pipe (5) is connected to the process gas ring pipe (3).

9. A process gas inlet system with adjustable area and angle for a gas-based vertical furnace according to claim 1 or 8, characterized in that: The process gas branch pipe (5) is formed by connecting a plurality of short pipe sections via a bellows compensator.

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