Preheating belt conveyor

Abstract

The utility model relates to the technical field of iron-making raw material production preheating, and mainly discloses a belt conveyor capable of preheating, which comprises a belt conveyor main body, a sealing cover, a preheating system and a regulation and control system, the sealing cover is used for sealing a lower-layer belt, the preheating system is used for preheating the lower-layer belt in the sealing cover, and the regulation and control system is used for regulating and controlling the lower-layer belt. The regulation and control system stably controls the preheating temperature, so that gentle preheating treatment is carried out, strengthening preheating is carried out on the conveying belt through on-line analysis of preheating requirements and full utilization of industrial waste gas waste heat, gentle preheating treatment is carried out on conveyed materials needing gentle preheating from inside to outside, a new way is provided for preheating treatment of the materials before iron making, and the production cost is reduced. And the method is an effective supporting technology for production intellectualization before iron making.

Description

Technical Field

[0001] The utility model relates to the technical field of preheating of ironmaking raw materials, in particular to a preheating belt conveyor. Background Art

[0002] Ironmaking is a production process in which iron ore is reduced to pig iron using a reducing agent at high temperature. Whether it is before sintering or pellet roasting, or before entering the blast furnace, preheating the material is an effective means to reduce production fuel consumption costs. At present, most production companies preheat materials quickly before roasting, and the preheating treatment is from the outside to the inside. Due to factors such as thermal expansion and contraction, it is easy to burst, and the preheating effect is extremely limited.

[0003] In the prior art, the Chinese utility model patent CN219014988U discloses a preheating device for preheating raw pellets using the waste heat of a roasting furnace. When the material enters the preheating cylinder, it is blocked by the partition and the pad, which slows down the speed of the material moving downward in the preheating cylinder, increases the contact time between the material and the flue gas, and ensures the preheating effect of the material. Even if this patented technology slows down the speed of the material moving downward in the preheating cylinder, it is still a fast preheating patented technology, and it is necessary to add a preheating device outside the production process, and the investment is relatively large. Utility Model Content

[0004] The purpose of the utility model is to solve the technical problems existing in the prior art and provide a preheatable belt conveyor. By analyzing the preheating demand online and making full use of the waste heat of industrial waste gas, the conveying belt is preheated in an enhanced manner, and then the conveying materials that need gentle preheating are preheated gently from the inside to the outside, which provides a new way for preheating treatment of ironmaking materials and is an effective supporting technology for intelligent ironmaking production.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a preheatable belt conveyor, comprising a belt conveyor body, a sealing cover, a preheating system and a regulating system, the belt conveyor body comprising a foundation support, a belt support and a high-temperature resistant belt, the belt support is arranged above the foundation support, the high-temperature resistant belt is installed on the belt support, and the sealing cover seals the lower belt of the high-temperature resistant belt; the preheating system comprises a waste heat pipe, an air pipe and an exhaust gas pipe. According to the running direction of the belt conveyor body, the left end of the running direction of the belt conveyor body is the tail end of the machine, and the right end is the head end of the machine. The waste heat pipe and the air pipe are arranged at the tail end of the belt conveyor body and are connected to the inside of the sealing cover, the exhaust gas pipe is arranged at the head end of the belt conveyor body and is connected to the inside of the sealing cover, and the waste heat pipe, the air pipe and the exhaust gas pipe are respectively provided with a waste heat control valve, an air control valve and an exhaust gas control valve, and the waste heat pipe and the waste heat control valve are mainly responsible for The high-temperature exhaust gas is introduced into the sealing cover at the tail feeding end, and the exhaust pipe and the exhaust control valve introduce the preheated high-temperature exhaust gas into the dust removal pipeline nearby from the head discharge end; the air pipe and the air control valve are mainly responsible for introducing compressed air into the sealing cover from the tail feeding end of the machine to control the high-temperature exhaust gas in the sealing cover within the tolerable range of the high-temperature resistant belt, and it is generally recommended to take ≤300℃; a scraper device, a cleaning device and a purge device are arranged in sequence from the head end to the tail end below the head end of the lower belt conveyor of the belt conveyor body, the scraper device is a hard steel plate or hard rubber, installed at an appropriate position under the discharge material flow, the cleaning device is an elastic brush, installed under the discharge material flow and at an appropriate position behind the first layer of scrapers, the purge device is an air pipe, which is connected to the compressed air source and is respectively installed at appropriate positions on both sides behind the scraper device and the cleaning device to blow and clean the particles adhered to the belt to prevent the belt-adhered materials from being brought into the lower belt and into the sealing cover.

[0006] A further solution of the utility model is that the control system includes a waste heat thermometer for measuring the waste heat temperature in the waste heat pipe, a tail outlet thermometer for measuring the tail outlet temperature at the tail of the lower belt machine, a head inlet thermometer for measuring the head inlet temperature at the head of the lower belt machine, a material outlet thermometer for measuring the material outlet temperature at the head of the upper belt machine, a material inlet thermometer for measuring the material inlet temperature at the tail of the upper belt machine, and an industrial control microcomputer. The industrial control microcomputer is used to collect temperature data collected by each thermometer and control the opening and closing of the waste heat control valve and the air control valve.

[0007] A further solution of the utility model is that the sealing cover comprises an upper sealing plate, a lower sealing plate, two side sealing plates and a head and tail sealing curtain, the upper sealing plate is installed between below the upper belt roller and above the lower belt of the belt conveyor body, the lower sealing plate is installed between below the bottom flat roller of the belt conveyor body and above the bottom of the foundation support, the two side sealing plates are located on both sides of the belt conveyor body in the width direction, and the head and tail sealing curtains are installed at the inlet and outlet of the sealing cover at the head and tail of the belt conveyor body.

[0008] A further solution of the utility model is that the head and tail sealing curtains include an upper sealing curtain and a lower sealing curtain, which are respectively installed on the upper and lower sides of the lower belt, and the upper sealing curtain and the lower sealing curtain perform flexibly sealing on the sealing cover.

[0009] A further solution of the utility model is that the high temperature resistant belt is a high temperature resistant silicone belt (can be used normally at 180°C and can withstand 300°C for a short time), the upper sealing plate, the lower sealing plate and the sealing plates on both sides are high temperature resistant and corrosion resistant steel plates, the high temperature resistant and corrosion resistant steel plates mainly include chromium-molybdenum alloy steel plates (such as Cr5Mo, 12CrMoV, 12Cr1MoV, etc.), 310S stainless steel plates, etc., and the head and tail sealing curtains are high temperature resistant and corrosion resistant rubber leather (high temperature resistant and corrosion resistant rubber mainly includes EP rubber, fluorosilicone rubber, silicone rubber, etc.).

[0010] A further solution of the utility model is that the waste heat thermometer, tail outlet thermometer, head inlet thermometer, material outlet thermometer and material inlet thermometer are all infrared temperature sensors, the waste heat thermometer is installed on the side of the waste heat pipe, the tail outlet thermometer is installed below the tail of the lower belt machine in the sealing cover, the head inlet thermometer is installed below the head of the lower belt machine in the sealing cover, the material outlet thermometer is installed above the head of the upper belt machine, and the material inlet thermometer is installed above the tail of the upper belt machine.

[0011] Through the above technical scheme, the belt conveyor body is arranged at the place where the material that needs gentle preheating is conveyed. The belt conveyor body conveys the material through the high-temperature resistant belt, and the high-temperature waste heat gas is conveyed to the sealing cover through the waste heat pipe to preheat the lower belt. Compressed gas is introduced into the sealing cover through the air pipe, and the high-temperature exhaust gas in the sealing cover is regulated to be within the tolerable range of the high-temperature resistant belt. The temperature data of each part is collected through the control system, and the opening and closing of the waste heat pipe and the air pipe are controlled by the valve. The preheating temperature in the sealing cover is timely regulated and stably controlled, so that the conveyed material that needs gentle preheating is gently preheated from the inside to the outside.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The utility model provides a preheating belt conveyor, which can be installed and improved by making full use of the material transport belt conveyor along the original production process. By utilizing the residual heat of industrial waste gas to strengthen the preheating of the conveyor belt, there is no need to add a preheating device outside the production process, and the preheating effect is accurate and controllable. By analyzing the preheating demand online, the residual heat of industrial waste gas is fully utilized to strengthen the preheating of the conveyor belt, and then the conveying material that needs gentle preheating is gently preheated. In the environment where production costs and environmental protection indicators are increasingly stringent, this patented technology requires little investment and is reliable in operation. It is easy to promote and apply by production enterprises in the same industry, providing a new way for preheating treatment of pre-iron materials, and it is also an effective supporting technology for intelligent pre-iron production. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 This is a schematic diagram of the mechanism of the preheatable belt conveyor provided in Example 1 of the utility model.

[0016] In the figure: 1. upper belt, 2. lower belt, 3. belt support, 4. foundation support, 5. upper belt roller, 6. bottom flat roller, 7. upper sealing plate, 8. lower sealing plate, 9. upper sealing curtain, 10. lower sealing curtain, 11. scraper device, 12. cleaning device, 13. purge device, 14. waste heat pipe, 15. waste heat control valve, 16. air pipe, 17. air control valve, 18. exhaust pipe, 19. exhaust control valve, 20. waste heat thermometer, 21. tail outlet thermometer, 22. head inlet thermometer, 23. material outlet thermometer, 24. material inlet thermometer. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] Example 1

[0019] like Figure 1 As shown, a preheatable belt conveyor includes a belt conveyor body, a sealing cover, a preheating system and a regulating system.

[0020] The belt conveyor body includes a foundation support 4, a belt support 3 and a high temperature resistant belt, the belt support 3 is arranged above the foundation support 4, and the high temperature resistant belt is installed on the belt support 3. The sealing cover seals the lower belt 2 of the high temperature resistant belt; the sealing cover includes an upper sealing plate 7, a lower sealing plate 8, two side sealing plates and a head and tail sealing curtain, the upper sealing plate 7 is installed between the lower belt roller 5 of the belt conveyor body and the upper part of the lower belt 2, the lower sealing plate 8 is installed between the lower flat roller 6 of the belt conveyor body and the upper part of the bottom of the foundation support 4, the two side sealing plates are located on both sides of the belt conveyor body in the width direction, and the head and tail sealing curtains are installed at the inlet and outlet of the sealing cover of the head and tail of the belt conveyor body.

[0021] The head and tail sealing curtains include an upper sealing curtain 9 and a lower sealing curtain 10, which are respectively installed on the upper and lower sides of the lower belt 2.

[0022] The preheating system includes a waste heat pipe 14, an air pipe 16 and an exhaust pipe 18. According to the running direction of the belt conveyor body, the left end of the running direction of the belt conveyor body is the tail end of the machine, and the right end is the head end of the machine. The waste heat pipe 14 and the air pipe 16 are arranged at the tail end of the belt conveyor body and are connected to the inside of the sealing cover. The exhaust pipe 18 is arranged at the head end of the belt conveyor body and is connected to the inside of the sealing cover. The waste heat pipe 14, the air pipe 16 and the exhaust pipe 18 are respectively provided with a waste heat control valve 15, an air control valve 17 and an exhaust control valve 19.

[0023] The waste heat pipe 14 and the waste heat control valve 15 are mainly responsible for introducing the high-temperature exhaust gas from the tail feeding end into the sealing cover. The exhaust pipe 18 and the exhaust control valve 19 introduce the preheated high-temperature exhaust gas from the head unloading end into the dust removal pipeline nearby. The air pipe 16 and the air control valve 17 are mainly responsible for introducing compressed air from the tail feeding end into the sealing cover to control the high-temperature exhaust gas in the sealing cover within the tolerable range of the high-temperature resistant belt. It is generally recommended to take ≤300℃.

[0024] The control system includes a waste heat thermometer 20 for measuring the waste heat temperature in the waste heat pipe 14, a tail outlet thermometer 21 for measuring the tail outlet temperature at the tail of the lower belt 2, a head inlet thermometer 22 for measuring the head inlet temperature at the head of the lower belt 2, a material outlet thermometer 23 for measuring the material outlet temperature at the head of the upper belt 1, a material inlet thermometer 24 for measuring the material inlet temperature at the tail of the upper belt 1, and an industrial control microcomputer. The industrial control microcomputer is used to collect temperature data collected by each thermometer and control the opening and closing of the waste heat control valve 15 and the air control valve 17.

[0025] The high temperature resistant belt is a high temperature resistant silicone belt (can be used normally at 180°C and can withstand 300°C for a short time), the upper sealing plate 7, the lower sealing plate 8 and the sealing plates on both sides are high temperature resistant and corrosion resistant steel plates, the high temperature resistant and corrosion resistant steel plates mainly include chromium-molybdenum alloy steel plates (such as Cr5Mo, 12CrMoV, 12Cr1MoV, etc.), 310S stainless steel plates, etc., the head and tail sealing curtains are high temperature resistant and corrosion resistant rubber leather (high temperature resistant and corrosion resistant rubber mainly includes EPDM rubber, fluorosilicone rubber, silicone rubber, etc.).

[0026] The waste heat thermometer 20, the tail outlet thermometer 21, the head inlet thermometer 22, the material outlet thermometer 23 and the material inlet thermometer 24 are all infrared temperature sensors. The waste heat thermometer 20 is installed on the side of the waste heat pipe 14, the tail outlet thermometer 21 is installed below the tail of the lower belt 2 in the sealing cover, the head inlet thermometer 22 is installed below the head of the lower belt 2 in the sealing cover, the material outlet thermometer 23 is installed above the head of the upper belt 1, and the material inlet thermometer 24 is installed above the tail of the upper belt 1.

[0027] A further solution of the utility model is that a scraper device 11, a cleaning device 12 and a blowing device 13 are sequentially arranged below the head end of the lower belt 2 of the belt conveyor body from the head end to the tail end. The scraper device 11 is a hard steel plate or hard rubber, installed at an appropriate position under the discharge material flow. The cleaning device 12 is an elastic brush, installed under the discharge material flow and at an appropriate position behind the first scraper. The blowing device 13 is an air pipe 16, which is connected to a compressed air source and is respectively installed at appropriate positions on both sides behind the scraper device 11 and the cleaning device 12 to blow and clean the particles adhered to the belt to prevent the belt-adhered materials from being brought into the lower belt 2 and into the sealing cover.

[0028] Through the above technical scheme, the belt conveyor body is arranged at the place where the material that needs gentle preheating is conveyed. The belt conveyor body conveys the material through the high-temperature resistant belt, and the high-temperature waste heat gas is conveyed to the sealing cover through the waste heat pipe 14 to preheat the lower belt 2. Compressed gas is introduced into the sealing cover through the air pipe 16, and the high-temperature exhaust gas in the sealing cover is regulated to be within the tolerable range of the high-temperature resistant belt. The temperature data of each part is collected through the control system, and the opening and closing of the waste heat pipe 14 and the air pipe 16 are controlled by the valve. The preheating temperature in the sealing cover is timely regulated and stably controlled, so that the conveyed material that needs gentle preheating is gently preheated from the inside to the outside.

[0029] Taking the 1.2 million tons chain grate machine-rotary kiln in the ironmaking area of ​​a company's ironmaking plant as an example, the raw balls are dried and preheated in the chain grate machine in sequence through drying stage 1 (250-350°C), drying stage 2 (350-450°C), preheating stage 1 (600-700°C), and preheating stage 2 (950-1050°C). The preheated balls enter the tail of the rotary kiln from the chain grate machine head through the shovel plate and the chute. This embodiment focuses on the installation of a preheating belt (160m long, 2m wide, and 0.5m / s belt speed) and slow preheating improvement on the front line ball making belt of the raw balls (normal temperature) entering the chain grate machine as an example, and the specific implementation method of the utility model is further explained in conjunction with the accompanying drawings.

[0030] The first step is to preheat the belt after installation. Based on the original ball-making belt conveyor, a high-temperature resistant silicone belt is used instead (it can be used normally at 180°C and can withstand 300°C for a short time); the original ball-making belt conveyor meets the requirements of the upper belt roller 5 and the lower belt 2 to reserve the installation space of the upper sealing plate 7 of the sealing cover, and the lower flat roller 6 and the foundation bracket 4 to reserve the installation space of the lower sealing plate 8 of the sealing cover.

[0031] The second step is to make and install the sealing cover. The upper sealing plate 7 (150m×2.2m), the lower sealing plate 8 (150m×2.2m), and the sealing plates on both sides (150m×1.2m) are made of high temperature and corrosion resistant steel plates. The upper sealing plate 7 is installed under the upper belt roller 5 of the belt conveyor body and at an appropriate position on the lower belt 2; the lower sealing plate 8 is installed under the bottom flat roller 6 and at an appropriate position on the foundation bracket 4; the sealing plates on both sides are installed on both sides of the belt conveyor body to connect the upper and lower sealing plates 8. The head and tail sealing curtains are made of high temperature and corrosion resistant rubber leather. The head and tail sealing curtains are both upper and lower layers (2.2m×0.55m), which are installed at the inlet and outlet of the head and tail sealing cover respectively to flexibly seal the inlet and outlet of the sealing cover.

[0032] The third step is to install the preheating system. Through the waste heat pipe 14 and the waste heat control valve 15, the high-temperature exhaust gas is introduced into the sealing cover from the tail feeding end of the machine; through the exhaust pipe 18 and the exhaust control valve 19, the compressed air is introduced into the sealing cover from the tail feeding end of the machine to control the high-temperature exhaust gas in the sealing cover within the range of ≤300℃ that the high-temperature belt can withstand. Through the exhaust pipe 18 and the exhaust control valve 19, the preheated high-temperature exhaust gas is introduced into the dust removal pipeline nearby from the head unloading end.

[0033] The fourth step is to install the control system. The waste heat thermometer 20 is installed on the side of the waste heat pipe 14, the tail outlet thermometer 21 is installed below the tail of the lower belt 2 in the sealed cover, the head inlet thermometer 22 is installed below the head of the lower belt 2 in the sealed cover, the material outlet thermometer 23 is installed above the head of the upper belt 1, and the material inlet thermometer 24 is installed above the tail of the upper belt 1.

[0034] The fifth step is to install the cleaning system. The scraper device 11 is a hard steel plate or hard rubber, installed at an appropriate position under the discharge material flow, the cleaning device 12 is an elastic brush, installed at an appropriate position under the discharge material flow and behind the first layer of scrapers, and the purge device 13 is an air pipe 16, which is connected to the compressed air source and is installed at appropriate positions on both sides of the scraper device 11 and the cleaning device 12, respectively, to purge and clean the particles adhered to the belt to prevent the materials adhered to the belt from being brought into the lower belt 2 and entering the sealing cover.

[0035] Actual operation steps: (1) After confirming that the dust removal pipeline along the line is working normally and the sealing cover is sealed and intact, open the exhaust gas control valve 19, the residual heat control valve 15 and the air control valve 17 in sequence. (2) Turn on the industrial control microcomputer. (3) The industrial control microcomputer collects the residual heat temperature, the tail outlet temperature, the head inlet temperature, the material inlet temperature, and the material outlet temperature online through the PLC, and adjusts the residual heat control valve 15 and the air control valve 17 in time to stably control the preheating temperature, so as to perform gentle preheating treatment on the conveyed materials that need gentle preheating.

[0036] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A preheatable belt conveyor, characterized in that: The invention comprises a belt conveyor body, a sealing cover and a preheating system. The belt conveyor body comprises a foundation support (4), a belt support (3) and a high-temperature resistant belt. The belt support (3) is arranged above the foundation support (4). The high-temperature resistant belt is installed on the belt support (3). The sealing cover seals the lower belt (2) of the high-temperature resistant belt. The preheating system comprises a waste heat pipe (14), an air pipe (16) and an exhaust pipe (18). The waste heat pipe (14) and the air pipe (16) are arranged at the rear end of the belt conveyor body and are connected to the inside of the sealing cover. The exhaust pipe (18) is arranged at the rear end of the belt conveyor body. The head end is connected to the inside of the sealing cover, and the waste heat pipe (14), air pipe (16) and exhaust pipe (18) are respectively provided with a waste heat control valve (15), an air control valve (17) and an exhaust control valve (19); a scraper device (11), a cleaning device (12) and a purge device (13) are sequentially provided below the head end of the lower belt (2) of the belt conveyor body from the head end to the tail end, wherein the scraper device (11) is a hard steel plate or hard rubber, the cleaning device (12) is an elastic brush, and the purge device (13) is an air pipe connected to a compressed air source.

2. The preheatable belt conveyor according to claim 1, characterized in that: The invention also comprises a control system, wherein the control system comprises a waste heat thermometer (20) for measuring the waste heat temperature in the waste heat pipe (14), a tail outlet thermometer (21) for measuring the tail outlet temperature at the tail of the lower belt (2), a head inlet thermometer (22) for measuring the head inlet temperature at the head of the lower belt (2), a material outlet thermometer (23) for measuring the material outlet temperature at the head of the upper belt (1), a material inlet thermometer (24) for measuring the material inlet temperature at the tail of the upper belt (1) and an industrial control microcomputer, wherein the industrial control microcomputer is used to collect temperature data collected by each thermometer and control the opening and closing of the waste heat control valve (15) and the air control valve (17).

3. The preheatable belt conveyor according to claim 2, characterized in that: The waste heat thermometer (20), the tail outlet thermometer (21), the head inlet thermometer (22), the material outlet thermometer (23) and the material inlet thermometer (24) are all infrared temperature sensors. The waste heat thermometer (20) is installed on the side of the waste heat pipe (14), the tail outlet thermometer (21) is installed below the tail of the lower belt (2) in the sealing cover, the head inlet thermometer (22) is installed below the head of the lower belt (2) in the sealing cover, the material outlet thermometer (23) is installed above the head of the upper belt (1), and the material inlet thermometer (24) is installed above the tail of the upper belt (1).

4. A preheatable belt conveyor according to claim 3, characterized in that: The sealing cover comprises an upper sealing plate (7), a lower sealing plate (8), two side sealing plates and a head and tail sealing curtain. The upper sealing plate (7) is installed between the lower part of the upper belt roller (5) and the upper part of the lower belt (2) of the belt conveyor body, and the lower sealing plate (8) is installed between the lower part of the bottom flat roller (6) of the belt conveyor body and the upper part of the bottom of the foundation support (4). The two side sealing plates are located on both sides of the width direction of the belt conveyor body, and the head and tail sealing curtains are installed at the inlet and outlet of the sealing cover of the head and tail of the belt conveyor body.

5. The preheatable belt conveyor according to claim 4, characterized in that: The head and tail sealing curtains include an upper sealing curtain (9) and a lower sealing curtain (10), which are respectively installed on the upper and lower sides of the lower belt (2), and the upper sealing curtain (9) and the lower sealing curtain (10) perform flexible sealing on the sealing cover.

6. A preheatable belt conveyor according to any one of claims 4-5, characterized in that: The high temperature resistant belt is a high temperature resistant silicone belt, the upper sealing plate (7), the lower sealing plate (8) and the sealing plates on both sides are high temperature resistant and corrosion resistant steel plates, and the head and tail sealing curtains are high temperature resistant and corrosion resistant rubber leather.

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