Feeding system of hot blast stove

Abstract

The invention discloses a hot blast stove feeding system which comprises a bin pump, a surge bin and a first storage bin used for storing upgrading pulverized coal, the bin pump, the surge bin and the first storage bin are sequentially arranged from bottom to top, and the lower end of the first storage bin and the upper end of the surge bin communicate with the two ends of a first valve correspondingly; the lower end of the surge bin and the upper end of the bin pump are communicated with the two ends of the second valve respectively, the output end of the bin pump is communicated with a material returning pipe used for discharging circulating ash into a hearth dense-phase area from the separator, a material level detection device is arranged in the bin pump, and the first valve, the second valve, the bin pump and the material level detection device are all electrically connected with the controller. The quality-improved pulverized coal is preheated by circulating ash before entering the hearth, so that the combustion efficiency of the quality-improved pulverized coal is improved, and the quality-improved pulverized coal can be continuously output to improve the combustion stability of the quality-improved pulverized coal.

Description

Technical Field

[0001] The invention belongs to the technical field of hot blast stove feeding, and in particular relates to a hot blast stove feeding system. Background Art

[0002] At present, the fuels used in hot blast furnaces include raw coal, coal gangue and upgraded coal powder, and the upgraded coal powder is often directly supplied to the dense phase area of ​​the furnace through a silo pump. However, conventional silo pumps are often discontinuous in conveying upgraded coal powder, which easily causes unstable combustion in the furnace; in addition, when the upgraded coal powder is directly supplied to the dense phase area of ​​the furnace, its combustion efficiency is low. Summary of the invention

[0003] In order to overcome the defects of the prior art, the present invention provides a hot blast stove feeding system, which can improve the combustion stability and combustion efficiency of upgraded coal powder.

[0004] The object of the present invention is achieved through the following technical solutions: A hot blast furnace feeding system comprises a bin pump, a buffer bin and a first storage bin for storing upgraded pulverized coal. The bin pump, the buffer bin and the first storage bin are arranged in sequence from bottom to top. The lower end of the first storage bin and the upper end of the buffer bin are respectively connected to the two ends of the first valve, the lower end of the buffer bin and the upper end of the bin pump are respectively connected to the two ends of the second valve, the output end of the bin pump is connected to a return pipe for discharging circulating ash from a separator into a dense phase area of ​​a furnace, a material level detection device is arranged in the bin pump, and the first valve, the second valve, the bin pump and the material level detection device are all electrically connected to a controller.

[0005] The beneficial effects of adopting the above technical solution are as follows: after opening the first valve, the upgraded coal powder in the first storage bin can enter the buffer bin under the action of gravity; after opening the second valve, the upgraded coal powder in the buffer bin can enter the bin pump under the action of gravity; the bin pump can output the upgraded coal powder therein to the return pipe, so that the upgraded coal powder can be preheated in advance by the circulating ash before entering the furnace, thereby improving the combustion efficiency; and the material level detection device can detect the material level of the upgraded coal powder in the bin pump, so as to open the second valve when the material level of the upgraded coal powder in the bin pump reaches a low material level, thereby replenishing the upgraded coal powder in the buffer bin to the bin pump, and When the upgraded coal powder level in the silo pump reaches a high level, the second valve is closed and the first valve is opened to replenish the upgraded coal powder in the first storage bin to the silo pump, so that the buffer bin contains enough upgraded coal powder to replenish the silo pump next time, which is beneficial to the silo pump to continuously output the upgraded coal powder, and further to improve the combustion stability of the upgraded coal powder; in addition, when the first storage bin replenishes the upgraded coal powder into the buffer bin, the buffer bin is not connected to the silo pump, that is, even if the silo pump is outputting the upgraded coal powder at this time, the upgraded coal powder in the buffer bin will not be blown back to the first storage bin due to the wind force in the silo pump.

[0006] In one embodiment, the hot blast furnace feeding system includes a storage tank for storing nitrogen, the silo pump includes an air chamber, a nozzle ring and a compression pump for supplying compressed nitrogen to the air chamber and the nozzle ring, the input end of the compression pump is connected to the storage tank, the output end of the compression pump and the air chamber are respectively connected to the two ends of the third valve, the output end of the compression pump and the nozzle ring are respectively connected to the two ends of the fourth valve, and the compression pump, the third valve and the fourth valve are all electrically connected to the controller.

[0007] The beneficial effects of adopting the above technical solution are: opening the third valve and the compression pump can compress the nitrogen and supply it to the air chamber, so as to facilitate the output of the upgraded coal powder to the return pipe; opening the fourth valve and the compression pump can compress the nitrogen and supply it to the nozzle ring, so as to facilitate the upgraded coal powder to form a fluidized state, thereby facilitating output; in addition, the temperature of the upgraded coal powder is relatively high, and using compressed nitrogen as the conveying gas can avoid the combustion of the upgraded coal powder during the conveying process.

[0008] In one embodiment, the output end of the compression pump is connected to a fifth valve electrically connected to the controller, and one end of the fifth valve away from the compression pump is connected to the third valve and the fourth valve.

[0009] The beneficial effect of adopting the above technical solution is: a fifth valve is provided to perform overall control over the supply of compressed nitrogen.

[0010] In one embodiment, a sixth valve electrically connected to the controller is provided at the lower end of the silo pump, one end of the fifth valve away from the compression pump and the lower end of the sixth valve are respectively connected to the two ends of the three-way pipe, and the other end of the three-way pipe is connected to the return pipe.

[0011] The beneficial effect of adopting the above technical solution is: after opening the fifth valve and the sixth valve, the upgraded coal powder in the silo pump can fall into the three-way pipe, and the compressed nitrogen output by the compression pump can provide wind power to enable the upgraded coal powder in the three-way pipe to be output to the return pipe.

[0012] In one embodiment, the hot blast furnace feeding system includes a seventh valve electrically connected to the controller, the end of the fifth valve away from the compression pump is connected to the seventh valve, and the end of the seventh valve away from the fifth valve is connected to the upper and lower parts of the buffer bin.

[0013] The beneficial effect of adopting the above technical solution is that the compression pump can also supply compressed nitrogen into the buffer bin to make the upgraded coal powder form a fluidized state, thereby facilitating output.

[0014] In one embodiment, the hot blast stove feeding system includes a plurality of coal feeding devices evenly arranged along the width direction of the furnace, and the output ends of the coal feeding devices are connected to the dense phase area of ​​the furnace.

[0015] The beneficial effect of adopting the above technical solution is that a plurality of coal feeding devices can evenly feed the crushed raw coal and coal gangue into the dense phase area of ​​the furnace along the width direction.

[0016] In one embodiment, the coal feeding device includes a second storage bin for placing crushed raw coal and coal gangue, a belt coal feeder and a coal chute. The input end and output end of the belt coal feeder are respectively connected to the lower end of the second storage bin and the upper end of the coal chute. The lower end of the coal chute is connected to the dense phase area of ​​the furnace. The coal chute is provided with a first air inlet for introducing coal spreading air and a second air inlet for introducing purge air.

[0017] The beneficial effects of adopting the above technical solution are as follows: after the crushed raw coal and coal gangue are placed in the second storage bin, they can fall to the input end of the belt coal feeder under the action of gravity, and then be transported by the belt coal feeder and fall to the coal drop pipe, so that they can be supplied into the dense phase area of ​​the furnace under the action of the coal spreading air supplied from the first air port; in addition, the purge air can purge the coal drop pipe to clean it.

[0018] In one embodiment, the belt coal feeder is a sealed belt coal feeder.

[0019] The beneficial effect of adopting the above technical solution is that the sealed belt coal feeder can play a sealing effect to prevent the raw coal and coal gangue from spilling out during the transportation process after crushing.

[0020] In one embodiment, the belt coal feeder is a weighing type belt coal feeder. In one embodiment, the output end of the coal feeding device and the slag outlet on the furnace are staggered in the width direction.

[0021] The beneficial effect of adopting the above technical solution is: such an arrangement can effectively prevent the crushed raw coal and coal gangue from being discharged from the furnace from the slag outlet as soon as they enter the furnace, thereby facilitating the burning of the crushed raw coal and coal gangue.

[0022] The beneficial effects of the present invention are: After opening the first valve, the upgraded coal powder in the first storage bin can enter the buffer bin under the action of gravity. After opening the second valve, the upgraded coal powder in the buffer bin can enter the bin pump under the action of gravity. The bin pump can output the upgraded coal powder therein to the return pipe, so that the upgraded coal powder can be preheated in advance by the circulating ash before entering the furnace, thereby improving the combustion efficiency. The material level detection device can detect the material level of the upgraded coal powder in the bin pump, so as to open the second valve when the material level of the upgraded coal powder in the bin pump reaches a low material level, thereby replenishing the upgraded coal powder in the buffer bin to the bin pump, and close the second valve and open the first valve when the material level of the upgraded coal powder in the bin pump reaches a high material level, thereby replenishing the upgraded coal powder in the first storage bin to the bin pump, so that the buffer bin contains enough upgraded coal powder to replenish the bin pump next time, which is beneficial to the continuous output of the upgraded coal powder by the bin pump, and further beneficial to improving the combustion stability of the upgraded coal powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings, wherein: Figure 1 Shows a schematic diagram of the structure of the present invention; Figure 2 The schematic diagram of the structure of the return pipe in the present invention is shown; Figure 3 The schematic diagram of the structure of the coal feeding device in the present invention is shown; In the drawings, like reference numerals are used for like parts. The drawings are not necessarily to scale.

[0024] Reference numerals: 1-bin pump, 2-material level detection device, 3-second valve, 4-buffer bin, 5-first storage bin, 6-first valve, 7-seventh valve, 8-fifth valve, 9-third valve, 10-fourth valve, 11-tee pipe, 12-sixth valve, 13-return pipe, 14-furnace, 15-second storage bin, 16-belt coal feeder, 17-coal drop pipe, 1701-first air outlet, 1702-second air outlet. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] Since conventional silo pumps operate in several stages including feeding, fluidizing, conveying and purging, their conveying of upgraded pulverized coal is intermittent and discontinuous. If pulverized coal is fed intermittently, it can easily cause unstable combustion in the furnace.

[0027] Therefore, the present invention provides a hot blast furnace feeding system, such as Figure 1 and Figure 2As shown, it includes a silo pump 1, a buffer silo 4 and a first storage silo 5 for storing upgraded pulverized coal. The silo pump 1, the buffer silo 4 and the first storage silo 5 are arranged in sequence from bottom to top. The lower end of the first storage silo 5 and the upper end of the buffer silo 4 are respectively connected to the two ends of the first valve 6, the lower end of the buffer silo 4 and the upper end of the silo pump 1 are respectively connected to the two ends of the second valve 3, the output end of the silo pump 1 is connected to a return pipe 13 for discharging circulating ash from the separator into the dense phase area of ​​the furnace 14, a material level detection device 2 is arranged in the silo pump 1, and the first valve 6, the second valve 3, the silo pump 1 and the material level detection device 2 are all electrically connected to the controller.

[0028] It can be understood that after opening the first valve 6, the upgraded coal powder in the first storage bin 5 can enter the buffer bin 4 under the action of gravity, and after opening the second valve 3, the upgraded coal powder in the buffer bin 4 can enter the bin pump 1 under the action of gravity, and the bin pump 1 can output the upgraded coal powder therein to the return pipe 13, so that the upgraded coal powder can be preheated in advance by the circulating ash before entering the furnace 14, thereby improving the combustion efficiency; and the level detection device 2 can detect the level of the upgraded coal powder in the bin pump 1, so as to open the second valve 3 when the upgraded coal powder level in the bin pump 1 reaches a low level, thereby replenishing the upgraded coal powder in the buffer bin 4 to the bin pump 1, and When the upgraded coal powder level inside reaches a high level, the second valve 3 is closed and the first valve 6 is opened, thereby replenishing the upgraded coal powder in the first storage bin 5 to the bin pump 1, so that the buffer bin 4 contains enough upgraded coal powder to replenish the bin pump 1 next time, which is beneficial for the bin pump 1 to continuously output the upgraded coal powder, and further helps to improve the combustion stability of the upgraded coal powder; in addition, when the first storage bin 5 replenishes the upgraded coal powder into the buffer bin 4, the buffer bin 4 is not connected to the bin pump 1, that is, even if the bin pump 1 is outputting the upgraded coal powder at this time, the upgraded coal powder in the buffer bin 4 will not be blown back to the first storage bin 5 by the wind force in the bin pump 1. In one embodiment, the hot blast furnace feeding system includes a storage tank for storing nitrogen, the silo pump 1 includes an air chamber, a nozzle ring and a compression pump for supplying compressed nitrogen to the air chamber and the nozzle ring, the input end of the compression pump is connected to the storage tank, the output end of the compression pump and the air chamber are respectively connected to the two ends of the third valve 9, the output end of the compression pump and the nozzle ring are respectively connected to the two ends of the fourth valve 10, and the compression pump, the third valve 9 and the fourth valve 10 are all electrically connected to the controller.

[0029] It can be understood that opening the third valve 9 and the compression pump can compress the nitrogen and supply it to the air chamber, so as to facilitate the upgraded coal powder to be output to the return pipe 13; opening the fourth valve 10 and the compression pump can compress the nitrogen and supply it to the nozzle ring, so as to facilitate the upgraded coal powder to form a fluidized state, thereby facilitating output; in addition, the temperature of the upgraded coal powder is relatively high, and the use of compressed nitrogen as the conveying gas can avoid the combustion of the upgraded coal powder during the transportation process.

[0030] In one embodiment, the output end of the compression pump is connected to a fifth valve 8 electrically connected to the controller, and one end of the fifth valve 8 away from the compression pump is connected to the third valve 9 and the fourth valve 10 .

[0031] It will be appreciated that the fifth valve 8 is provided to generally control the supply of compressed nitrogen.

[0032] In one embodiment, a sixth valve 12 electrically connected to the controller is provided at the lower end of the silo pump 1, and one end of the fifth valve 8 away from the compression pump and the lower end of the sixth valve 12 are respectively connected to the two ends of the three-way pipe 11, and the other end of the three-way pipe 11 is connected to the return pipe 13.

[0033] It can be understood that after opening the fifth valve 8 and the sixth valve 12, the upgraded coal powder in the silo pump 1 can fall into the three-way pipe 11, and the compressed nitrogen output by the compression pump can provide wind power so that the upgraded coal powder in the three-way pipe 11 can be output to the return pipe 13.

[0034] It should be noted that a conical tube is provided inside the end of the three-way pipe 11 close to the fifth valve 8, and the inner diameter of the conical tube close to the fifth valve 8 is larger, so as to improve the blowing effect of compressed nitrogen; an eighth valve is also provided between the three-way pipe 11 and the fifth valve 8.

[0035] In one embodiment, the hot blast furnace feeding system includes a seventh valve 7 electrically connected to the controller, the end of the fifth valve 8 away from the compression pump is connected to the seventh valve 7, and the end of the seventh valve 7 away from the fifth valve 8 is connected to the upper and lower parts of the buffer bin 4.

[0036] It is understandable that the compression pump can also supply compressed nitrogen into the buffer bin 4 to fluidize the upgraded pulverized coal, thereby facilitating output.

[0037] It should be noted that by controlling the first valve 6, the second valve 3, the third valve 9, the fourth valve 10, the fifth valve 8, the sixth valve 12, the seventh valve 7 and the compression pump and other devices, the upgraded fly ash can be automatically, continuously and stably supplied to the return pipe 13.

[0038] In one embodiment, the hot blast stove feeding system includes four coal feeding devices evenly arranged along the width direction of the furnace 14 , and the output ends of the coal feeding devices are connected to the dense phase area of ​​the furnace 14 .

[0039] It can be understood that the four coal feeding devices can evenly supply the crushed raw coal and coal gangue into the dense phase area of ​​the furnace 14 along the width direction.

[0040] In one embodiment, Figure 3As shown, the coal feeding device includes a second storage bin 15 for placing crushed raw coal and coal gangue, a belt coal feeder 16 and a coal dropping pipe 17. The input end and the output end of the belt coal feeder 16 are respectively connected to the lower end of the second storage bin 15 and the upper end of the coal dropping pipe 17. The lower end of the coal dropping pipe 17 is connected to the dense phase area of ​​the furnace 14. The coal dropping pipe 17 is provided with a first air port 1701 for introducing coal spreading air and a second air port 1702 for introducing purge air.

[0041] It can be understood that after the crushed raw coal and coal gangue are placed in the second storage bin 15, they can fall to the input end of the belt coal feeder 16 under the action of gravity, and then be transported by the belt coal feeder 16 and fall to the coal drop pipe 17, so that they can be supplied into the dense phase area of ​​the furnace 14 under the action of the coal spreading air supplied from the first air port 1701; in addition, the purge air can purge the coal drop pipe 17 to clean it.

[0042] It should be noted that the slag dropping pipe includes a vertical pipe and an inclined pipe for introducing crushed raw coal and coal gangue into the dense phase area. The upper end of the vertical pipe is connected to the output end of the belt coal feeder 16, the lower end of the vertical pipe is connected to the upper part of the inclined pipe, and the lower end of the inclined pipe is connected to the dense phase area of ​​the furnace 14; an electric gate door and an expansion joint are arranged in the middle of the vertical pipe, and the first air outlet 1701 and the second air outlet 1702 are arranged on the inclined pipe.

[0043] In one embodiment, the belt coal feeder 16 is a sealed belt coal feeder, which can have a sealing effect to prevent the raw coal and coal gangue from spilling out during transportation after crushing.

[0044] In one embodiment, the coal belt feeder 16 is a weighing type coal belt feeder.

[0045] In one embodiment, the output end of the coal feeding device is staggered with the slag outlet on the furnace 14 in the width direction to effectively prevent the crushed raw coal and coal gangue from being discharged from the furnace 14 from the slag outlet as soon as they enter the furnace 14, thereby facilitating the burning of the crushed raw coal and coal gangue.

[0046] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "bottom", "top", "front", "back", "inside", "outside", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0047] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in a manner different from that described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be used in other described embodiments.

Claims

1. A hot blast furnace feeding system, characterized in that: The invention comprises a silo pump (1), a buffer silo (4) and a first storage silo (5) for storing upgraded pulverized coal. The silo pump (1), the buffer silo (4) and the first storage silo (5) are arranged in sequence from bottom to top. The lower end of the first storage silo (5) and the upper end of the buffer silo (4) are respectively connected to the two ends of a first valve (6). The lower end of the buffer silo (4) and the upper end of the silo pump (1) are respectively connected to the two ends of a second valve (3). The output end of the silo pump (1) is connected to a return pipe (13) for discharging circulating ash from a separator into a dense phase zone of a furnace (14). A material level detection device (2) is arranged in the silo pump (1). The first valve (6), the second valve (3), the silo pump (1) and the material level detection device (2) are all electrically connected to a controller.

2. A hot blast stove feeding system according to claim 1, characterized in that: The invention comprises a storage tank for storing nitrogen, the silo pump (1) comprises an air chamber, a nozzle ring and a compression pump for supplying compressed nitrogen to the air chamber and the nozzle ring, the input end of the compression pump is connected to the storage tank, the output end of the compression pump and the air chamber are respectively connected to the two ends of a third valve (9), the output end of the compression pump and the nozzle ring are respectively connected to the two ends of a fourth valve (10), and the compression pump, the third valve (9) and the fourth valve (10) are all electrically connected to the controller.

3. A hot blast stove feeding system according to claim 2, characterized in that: The output end of the compression pump is connected to a fifth valve (8) electrically connected to the controller, and an end of the fifth valve (8) away from the compression pump is connected to the third valve (9) and the fourth valve (10).

4. A hot blast stove feeding system according to claim 3, characterized in that: A sixth valve (12) electrically connected to the controller is provided at the lower end of the silo pump (1); an end of the fifth valve (8) away from the compression pump and the lower end of the sixth valve (12) are respectively connected to the two ends of a three-way pipe (11); and the other end of the three-way pipe (11) is connected to the return pipe (13).

5. A hot blast stove feeding system according to claim 3, characterized in that: It comprises a seventh valve (7) electrically connected to the controller, the end of the fifth valve (8) away from the compression pump is connected to the seventh valve (7), and the end of the seventh valve (7) away from the fifth valve (8) is connected to the upper part and the lower part of the buffer bin (4).

6. A hot blast stove feeding system according to claim 1, characterized in that: It comprises a plurality of coal feeding devices evenly arranged along the width direction of the furnace (14), wherein the output ends of the coal feeding devices are connected to the dense phase area of ​​the furnace (14).

7. A hot blast stove feeding system according to claim 6, characterized in that: The coal feeding device comprises a second storage bin (15) for placing crushed raw coal and coal gangue, a belt coal feeder (16) and a coal drop pipe (17); the input end and the output end of the belt coal feeder (16) are respectively connected to the lower end of the second storage bin (15) and the upper end of the coal drop pipe (17); the lower end of the coal drop pipe (17) is connected to the dense phase area of ​​the furnace (14); and the coal drop pipe (17) is provided with a first air port (1701) for introducing coal spreading air and a second air port (1702) for introducing purge air.

8. A hot blast stove feeding system according to claim 7, characterized in that: The belt coal feeder (16) is a sealed belt coal feeder.

9. A hot blast stove feeding system according to claim 7, characterized in that: The belt coal feeder (16) is a weighing type belt coal feeder.

10. A hot blast stove feeding system according to claim 6, characterized in that: The output end of the coal feeding device and the slag drop opening on the furnace (14) are arranged staggered in the width direction.

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