CN116516092A - Waste flue gas recycling system of hot blast stove - Google Patents
Waste flue gas recycling system of hot blast stove Download PDFInfo
- Publication number
- CN116516092A CN116516092A CN202310602126.5A CN202310602126A CN116516092A CN 116516092 A CN116516092 A CN 116516092A CN 202310602126 A CN202310602126 A CN 202310602126A CN 116516092 A CN116516092 A CN 116516092A
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- China
- Prior art keywords
- temperature
- flue gas
- pipeline
- hot blast
- blast stove
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 155
- 239000003546 flue gas Substances 0.000 title claims abstract description 155
- 239000002699 waste material Substances 0.000 title claims abstract description 54
- 238000004064 recycling Methods 0.000 title claims abstract description 34
- 239000003245 coal Substances 0.000 claims abstract description 67
- 230000001105 regulatory effect Effects 0.000 claims abstract description 62
- 238000004321 preservation Methods 0.000 claims abstract description 55
- 238000001035 drying Methods 0.000 claims abstract description 35
- 239000002912 waste gas Substances 0.000 claims abstract description 35
- 230000000630 rising effect Effects 0.000 claims abstract description 16
- 239000007789 gas Substances 0.000 claims description 39
- 238000007664 blowing Methods 0.000 claims description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 239000000843 powder Substances 0.000 claims description 17
- 238000006477 desulfuration reaction Methods 0.000 claims description 14
- 230000023556 desulfurization Effects 0.000 claims description 14
- 238000009413 insulation Methods 0.000 claims description 10
- 239000004744 fabric Substances 0.000 claims description 7
- 230000001276 controlling effect Effects 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 239000002918 waste heat Substances 0.000 abstract description 8
- 238000002347 injection Methods 0.000 description 13
- 239000007924 injection Substances 0.000 description 13
- 239000002817 coal dust Substances 0.000 description 12
- 238000010438 heat treatment Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 3
- 230000001012 protector Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010981 drying operation Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
- C21B9/10—Other details, e.g. blast mains
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
- C21B5/003—Injection of pulverulent coal
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/002—Evacuating and treating of exhaust gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/60—Process control or energy utilisation in the manufacture of iron or steel
- C21B2100/64—Controlling the physical properties of the gas, e.g. pressure or temperature
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/60—Process control or energy utilisation in the manufacture of iron or steel
- C21B2100/66—Heat exchange
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2201/00—Pretreatment of solid fuel
- F23K2201/20—Drying
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2900/00—Special features of, or arrangements for fuel supplies
- F23K2900/01041—Heating by using exhaust gas heat
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a waste flue gas recycling system of a hot blast stove, which comprises the following components: the primary temperature adjusting unit comprises a diffusing pipeline, a low-temperature waste gas pipeline, a high-temperature waste gas pipeline, a converging pipeline connected with the low-temperature waste gas pipeline and the high-temperature waste gas pipeline and a drying pipeline connected with the converging pipeline, the diffusing pipeline is provided with a hot blast stove heat exchanger, the low-temperature waste gas pipeline and the high-temperature waste gas pipeline are respectively connected with two sides of the hot blast stove heat exchanger, and the drying pipeline is connected with a coal mill; the secondary temperature regulating unit comprises a first heat preservation Wen Zhiguan, a second heat preservation branch pipe, a heat preservation main pipe connected with the first heat preservation branch pipe and the second heat preservation branch pipe and a heat exchange branch pipe connected with the heat preservation main pipe, a flue gas temperature rising furnace is arranged on a drying pipeline, and the first heat preservation branch pipe Wen Zhiguan and the second heat preservation branch pipe are respectively connected to an inlet side and an outlet side of the flue gas temperature rising furnace. The invention can solve the problems that the current waste flue gas recycling system of the hot blast stove is difficult to effectively control the recycled flue gas temperature and can not effectively utilize the flue gas waste heat.
Description
Technical Field
The invention relates to the technical field of blast furnace ironmaking, in particular to a hot blast furnace waste gas recycling system capable of effectively utilizing waste gas and waste heat of a hot blast furnace.
Background
The blast furnace coal injection is a key technology of modern blast furnace ironmaking, and is an important means for reducing the coke ratio, reducing the cost and improving the working state of a blast furnace hearth to ensure that the blast furnace stably and smoothly runs, so that a powder preparation injection station is required to provide qualified and stable coal dust for the blast furnace. The coal mill is core equipment of a pulverizing system, and in the working process of the coal mill, a drying inert body with the temperature of 250-300 ℃ is required to be introduced to dry coal powder; the waste flue gas of the hot blast stove contains a large amount of heat, the temperature of the flue gas before the heat exchanger is 300-350 ℃, and the temperature is reduced to about 150 ℃ after passing through the heat exchanger. In the prior art, waste flue gas after leading a hot blast stove heat exchanger is mostly adopted to enter a flue gas temperature rising furnace of a powder making injection station, and is mixed with high-temperature flue gas generated by combustion of the waste flue gas to be used for drying pulverized coal by a coal mill. Because the environmental protection requirements are more strict, a desulfurization and denitrification device is required to be added behind a heat exchanger of the hot blast stove, the temperature influence of different desulfurization and denitrification processes on waste flue gas of the hot blast stove is different, and when the temperature of the waste flue gas is reduced by 30-50 ℃ after desulfurization and denitrification, the powder process is greatly influenced. And the recycling of waste flue gas of the hot blast stove is limited to the method, and most of heat is discharged along with a chimney, so that the waste flue gas of the hot blast stove is not effectively utilized.
Meanwhile, after waste flue gas of a hot blast stove used in the existing blast furnace coal injection system is taken from a heat exchanger of the hot blast stove, the flue gas quantity is enough, but the temperature of the waste flue gas exhausted by the hot blast stove is fluctuated to a certain extent, particularly, after the waste flue gas is subjected to a desulfurization and denitrification process, the temperature of the waste flue gas is too low, and when the waste flue gas is conveyed to a powder preparation injection station for a long distance through a metal pipeline, the wall temperature of a metal convection heating surface is lower than the acid dew point of the flue gas, so that acid drops are condensed on the surface of the metal heating surface, and the pipeline is corroded. If insufficient heat is introduced into a mill in a blast furnace coal injection system, the water content of pulverized coal is increased, a pulverized coal conveying pipeline or a spray gun is easily blocked, and the normal production of the blast furnace is influenced; meanwhile, the temperature of the waste flue gas of the hot blast stove shows periodic fluctuation, so that the operation difficulty of the flue gas temperature rising furnace is increased.
Disclosure of Invention
The invention aims to provide a waste flue gas recycling system of a hot blast stove, which solves the problems that the existing waste flue gas recycling system of the hot blast stove is difficult to effectively control the temperature of flue gas and cannot effectively utilize the waste heat of the flue gas.
The implementation purpose of the invention is mainly realized by the following technical scheme:
the invention provides a waste flue gas recycling system of a hot blast stove, which comprises the following components:
the primary temperature adjusting unit is provided with a diffusing pipeline, a low-temperature waste gas pipeline, a high-temperature waste gas pipeline, a converging pipeline and a drying pipeline connected with the converging pipeline, wherein the diffusing pipeline is provided with a hot blast stove heat exchanger, the low-temperature waste gas pipeline is connected with a low-temperature side port of the hot blast stove heat exchanger, the high-temperature waste gas pipeline is connected with a high-temperature side port of the hot blast stove heat exchanger, the converging pipeline is respectively connected with the low-temperature waste gas pipeline and the high-temperature waste gas pipeline, and the drying pipeline is connected with a coal mill;
the second-stage temperature regulating unit is provided with a first heat preservation Wen Zhiguan, a second heat preservation branch pipe, a heat preservation main pipe and a plurality of heat exchange branch pipes connected with the heat preservation main pipe, a flue gas temperature rising furnace is arranged on the drying pipeline, the first heat preservation Wen Zhiguan and the second heat preservation branch pipes are respectively connected with the inlet side and the outlet side of the flue gas temperature rising furnace, the heat preservation main pipe is respectively connected with the first heat preservation branch pipes and the second heat preservation branch pipes, and the heat exchange branch pipes are respectively arranged on the outer side of a raw coal bin, the outer side of a pulverized coal bin, the outer side of a fire-fighting water pipe and a blowing heat exchanger connected to a blowing gas pipeline.
In a preferred embodiment of the invention, a fan is provided on the converging line, said fan being located at the upstream end of the drying line.
In a preferred embodiment of the invention, the low temperature exhaust gas line is provided with a first temperature transmitter, a first shut-off valve, a first flowmeter and a first flow regulating valve; and the high-temperature exhaust gas pipeline is provided with a second temperature transmitter, a second shut-off valve, a second flowmeter and a second flow regulating valve.
In a preferred embodiment of the present invention, the first thermal insulation branch pipe is provided with a third shut-off valve, a third flowmeter and a third flow regulating valve, and the second thermal insulation branch pipe is provided with a fourth shut-off valve, a fourth flowmeter and a fourth flow regulating valve.
In a preferred embodiment of the present invention, the converging pipeline is provided with a third temperature transmitter, the blowing gas pipeline is provided with a fourth temperature transmitter, and the inlet of the flue gas temperature increasing furnace is provided with a fifth cut-off valve.
In a preferred embodiment of the present invention, the plurality of heat exchange branch pipes include a first heat exchange branch pipe, a second heat exchange branch pipe, a third heat exchange branch pipe and a fourth heat exchange branch pipe, the first heat exchange branch pipe is connected with the blowing heat exchanger, and the second heat exchange branch pipe, the third heat exchange branch pipe and the fourth heat exchange branch pipe are respectively coiled on the outer side of the raw coal bin, the outer side of the pulverized coal bin and the outer side of the fire-fighting water pipe.
In a preferred embodiment of the present invention, a sixth shut-off valve, a seventh shut-off valve, an eighth shut-off valve and a ninth shut-off valve are provided on the first heat exchange branch pipe, the second heat exchange branch pipe, the third heat exchange branch pipe and the fourth heat exchange branch pipe, respectively.
In a preferred embodiment of the invention, the outlet of the bleeding line is connected with a stove chimney, and a tenth shut-off valve is arranged on the pipeline between the stove heat exchanger and the stove chimney.
In a preferred embodiment of the present invention, a hot blast stove desulfurization device is disposed between the hot blast stove heat exchanger and the hot blast stove chimney, and the hot blast stove desulfurization device is disposed in parallel with the tenth shut-off valve.
In a preferred embodiment of the present invention, the outlet pipe of the first heat exchange branch pipe, the outlet pipe of the second heat exchange branch pipe, the outlet pipe of the third heat exchange branch pipe and the outlet pipe of the fourth heat exchange branch pipe are connected with a main exhaust fan; the outlet of the coal mill is connected with a cloth bag powder collector, and the cloth bag powder collector is connected with the main exhaust fan.
In a preferred embodiment of the invention, the hot blast stove waste flue gas recycling system further comprises a control unit, and the control unit can control the opening degree of the first flow regulating valve and/or the opening degree of the second flow regulating valve in a state that the flue gas temperature and/or the flow rate in the converging pipeline exceeds a first set threshold value.
In a preferred embodiment of the present invention, the hot blast stove waste flue gas recycling system further includes a control unit, and the control unit can control the opening degree of the third flow rate regulating valve and the opening degree of the fourth flow rate regulating valve in a state that the flue gas temperature and/or flow rate in the heat preservation main pipe exceeds a second set threshold value.
Compared with the prior art, the technical scheme provided by the invention has the following characteristics and advantages:
1. after the flue gas temperature of the hot blast stove is regulated by the primary temperature regulating unit, waste heat of waste flue gas of the hot blast stove is utilized to the coal mill, required air quantity and heat are provided for drying coal dust, the flue gas temperature after primary temperature regulation is regulated again by the secondary temperature regulating unit, and the flue gas temperature is used for heat preservation and heat tracing of the raw coal bin, the coal dust bin, the gas spraying pipeline and the fire-fighting water pipe, and meanwhile, electric energy heating or steam is replaced to serve as heat tracing and heat preserving mediums of the raw coal bin, the coal dust bin, the gas spraying pipeline and the fire-fighting water pipe, so that energy consumption is reduced, and production cost is saved.
2. According to the invention, the control unit is used for controlling the first flow regulating valve and the second flow regulating valve, so that the temperature of waste flue gas can be accurately controlled, the operation difficulty of a flue gas temperature rising furnace of a powder preparation injection station is reduced, the production of a coal mill is stabilized, the blockage of a pipeline or a spray gun caused by fluctuation of the water content of pulverized coal is avoided, and the operation of a powder preparation injection system and the stable operation of a blast furnace are facilitated; according to the invention, the control unit is used for controlling the third flow regulating valve and the fourth flow regulating valve, so that the temperature of waste smoke subjected to heat preservation and heat tracing can be accurately controlled, and the safe and stable operation of the raw coal bin, the pulverized coal bin, the blowing gas pipeline and the fire-fighting water pipe is ensured.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. In the drawings:
FIG. 1 is a schematic diagram of a waste flue gas recycling system for a hot blast stove according to the present invention;
fig. 2 is a schematic diagram of a connection structure of the waste flue gas recycling system of the hot blast stove.
Reference numerals illustrate:
10. a first-stage temperature adjusting unit; 11. a blow-off line; 111. a hot blast stove heat exchanger; 112. a hot blast stove chimney; 12. a low temperature exhaust line; 13. a high temperature exhaust line; 14. converging pipelines; 141. a blower; 15. a drying line;
20. a secondary temperature adjusting unit; 21. first protection Wen Zhiguan; 22. a second thermal insulation branch pipe; 23. a heat preservation main pipe; 24. a heat exchange branch pipe; 241. a first heat exchange branch pipe; 242. a second heat exchange branch pipe; 243. a third heat exchange branch pipe; 244. a fourth heat exchange branch pipe;
30. a first temperature transmitter; 31. a first shut-off valve; 32. a first flowmeter; 33. a first flow regulating valve;
40. a second temperature transmitter; 41. a second shut-off valve; 42. a second flowmeter; 43. a second flow regulating valve;
50. a third shut-off valve; 51. A third flowmeter; 52. A third flow rate adjustment valve;
60. a fourth shut-off valve; 61. A fourth flow meter; 62. A fourth flow regulating valve;
70. a third temperature transmitter; 71. a fourth temperature transmitter; 72. a fifth shut-off valve; 73. a sixth shut-off valve; 74. a seventh shut-off valve; 75. an eighth shut-off valve; 76. a ninth shut-off valve; 77. a tenth shut-off valve;
80. a coal mill; 81. a flue gas temperature rising furnace; 82. raw coal bin; 83. a coal dust bin; 84. a blowing gas pipe; 85. blowing a heat exchanger; 86. a hot blast stove desulfurizing device; 87. a fire hose; 88. a cloth bag powder collector; 89. and a main exhaust fan.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, shall fall within the scope of the invention.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The implementation purpose of the invention is mainly realized by the following technical scheme:
as shown in fig. 1 and 2, the present invention provides a hot blast stove waste gas recycling system, which comprises a primary temperature adjusting unit 10 and a secondary temperature adjusting unit 20, wherein the primary temperature adjusting unit 10 is provided with a diffusing pipeline 11, a low temperature waste gas pipeline 12, a high temperature waste gas pipeline 13, a converging pipeline 14 and a drying pipeline 15 connected with the converging pipeline 14, the diffusing pipeline 11 is provided with a hot blast stove heat exchanger 111, the low temperature waste gas pipeline 12 is connected with a low temperature side port of the hot blast stove heat exchanger 111, the high temperature waste gas pipeline 13 is connected with a high temperature side port of the hot blast stove heat exchanger 111, the converging pipeline 14 is respectively connected with the low temperature waste gas pipeline 12 and the high temperature waste gas pipeline 13, and the drying pipeline 15 is connected with a coal mill 80; the secondary temperature adjusting unit 20 is provided with a first heat preservation Wen Zhiguan, a second heat preservation branch pipe 22, a heat preservation main pipe 23 and a plurality of heat exchange branch pipes 24 connected with the heat preservation main pipe 23, a flue gas temperature raising furnace 81 is arranged on the drying pipeline 15, the first heat preservation Wen Zhiguan and the second heat preservation branch pipe 22 are respectively connected with the inlet side and the outlet side of the flue gas temperature raising furnace 81, the heat preservation main pipe 23 is respectively connected with the first heat preservation Wen Zhiguan and the second heat preservation branch pipe 22, and the plurality of heat exchange branch pipes 24 are respectively arranged on the outer side of the raw coal bin 82, the outer side of the pulverized coal bin 83 and the outer side of the fire water pipe 87 in a coiled mode, and a blowing heat exchanger 85 connected with a blowing air pipeline 84.
According to the hot blast stove waste flue gas recycling system, the two ends of the hot blast stove heat exchanger 111 on the diffusing pipeline 11 are respectively connected with the low-temperature waste gas pipeline 12 and the high-temperature waste gas pipeline 13, and the temperature of flue gas entering the converging pipeline 14 can be adjusted by adjusting the flow of low-temperature flue gas and high-temperature flue gas before mixing, so that the flue gas entering the drying pipeline 15 is ensured to have enough heat. The two ends of the flue gas temperature rising furnace 81 on the drying pipeline 15 are respectively connected with the first Wen Zhiguan and the second heat preservation branch pipe 22, and flue gas with different temperatures before and after the flue gas temperature rising furnace 81 is mixed, so that the temperature of flue gas entering the heat preservation main pipe 23 is adjusted, flue gas waste heat after temperature adjustment is used for heating and preserving the heat of the raw coal bin 82, the coal dust bin 83, the air pipe 84 for injection and the fire-fighting water pipe 87, and electric energy heating or steam is replaced to serve as heat-tracing heat preservation mediums of the raw coal bin 82, the coal dust bin 83, the air pipe 84 for injection and the fire-fighting water pipe 87, so that energy consumption is reduced, and production cost is saved.
Specifically, as shown in fig. 2, in the primary temperature adjustment unit 10:
the hot blast stove is connected with a diffusing pipeline 11 for discharging waste flue gas in the hot blast stove, the diffusing pipeline 11 is connected with a hot blast stove heat exchanger 111, waste flue gas is subjected to waste heat recovery through the hot blast stove heat exchanger 111, an outlet of the diffusing pipeline 11 is connected with a hot blast stove chimney 112, and low-temperature waste flue gas subjected to heat exchange treatment is discharged into the atmosphere through the hot blast stove chimney 112.
According to an embodiment of the present invention, as shown in fig. 2, a tenth shut-off valve 77 is provided in the blow-off line 11, a stove desulfurization device 86 is provided in a pipe between the stove heat exchanger 111 and the stove chimney 112, and the stove desulfurization device 86 is provided in parallel with the tenth shut-off valve 77. The low-temperature waste flue gas after heat exchange is desulfurized by the hot blast stove desulfurization device 86 and then is discharged into the atmosphere, so that the pollution of air after sulfur-containing flue gas emission is avoided. When the waste flue gas desulfurization is required, the tenth cut-off valve 77 is kept closed, and the waste flue gas is discharged from the hot blast stove chimney 112 after being desulfurized by the hot blast stove desulfurization device 86; when the hot blast stove desulfurization device 86 is overhauled and is stopped, the tenth cut-off valve 77 is opened, and the waste flue gas is directly discharged from the hot blast stove chimney 112 through the diffusing pipeline 11.
The low temperature side port and the high temperature side port of the hot blast stove heat exchanger 111 on the diffusing pipeline 11 are respectively connected with a low temperature waste gas pipeline 12 and a high temperature waste gas pipeline 13, part of low temperature flue gas after heat exchange treatment enters the low temperature waste gas pipeline 12, part of high temperature flue gas without heat exchange treatment enters the high temperature waste gas pipeline 13, and the high temperature flue gas and the low temperature flue gas are mixed and enter the coal mill 80 in the drying pipeline 15 for coal dust drying operation. The arrangement of the low-temperature exhaust gas pipeline 12 can further recycle the waste heat of the low-temperature flue gas after heat exchange, and the arrangement of the high-temperature exhaust gas pipeline 13 can mix the high-temperature flue gas which is not subjected to heat exchange with the low-temperature flue gas, so that the phenomenon that the coal mill 80 in the drying pipeline 15 cannot work normally due to insufficient heat of the low-temperature flue gas is avoided.
According to one embodiment of the present invention, as shown in FIG. 2, a first temperature transmitter 30, a first shut-off valve 31, a first flowmeter 32, and a first flow regulating valve 33 are provided on the low temperature exhaust line 12; the high temperature exhaust gas line 13 is provided with a second temperature transmitter 40, a second shut-off valve 41, a second flowmeter 42 and a second flow regulating valve 43.
The first temperature transmitter 30 measures the temperature of the low-temperature flue gas in the low-temperature exhaust gas pipeline 12 and transmits a temperature signal, the first flowmeter 32 measures the flow of the low-temperature flue gas in the low-temperature exhaust gas pipeline 12, the first flow regulating valve 33 can control the size of the opening according to an external control signal so as to regulate the flow of the flue gas in the low-temperature exhaust gas pipeline 12, and the first shutoff valve 31 can close the low-temperature exhaust gas pipeline 12. The second temperature transmitter 40 measures the temperature of the high temperature flue gas in the high temperature exhaust gas pipeline 13 and transmits a temperature signal, the second flowmeter 42 measures the flow of the high temperature flue gas in the high temperature exhaust gas pipeline 13, the second flow regulating valve 43 can control the size of the opening according to an external control signal so as to regulate the flow of the flue gas in the high temperature exhaust gas pipeline 13, and the second shut-off valve 41 can close the high temperature exhaust gas pipeline 13.
By controlling the first flow regulating valve 33 and the second flow regulating valve 43 in real time, the temperature and the flow of the flue gas entering the drying pipeline 15 can be regulated and controlled, so that the temperature of the flue gas can be maintained within a certain range, and the abnormal operation of the coal mill 80 in the drying pipeline 15 caused by the overlarge temperature fluctuation range of the flue gas is avoided.
The converging pipeline 14 is respectively connected with the low-temperature exhaust pipeline 12 and the high-temperature exhaust pipeline 13, low-temperature flue gas in the low-temperature exhaust pipeline 12 and high-temperature flue gas in the high-temperature exhaust pipeline 13 enter the converging pipeline 14 to be mixed, the mixed flue gas enters the drying pipeline 15 connected with the converging pipeline 14, the drying pipeline 15 is connected with the coal mill 80, and the flue gas in the drying pipeline 15 is heated by the flue gas heating furnace 81 and then is used for drying coal dust in the coal mill 80.
According to one embodiment of the invention, as shown in fig. 2, a fan 141 is provided on the converging line 14, the fan 141 being located at the upstream end of the drying line 15, the fan 141 and the main exhaust fan 89 powering the whole hot blast stove waste flue gas recycling system. In this embodiment, the fan 141 is a variable frequency fan 141, and the air volume of the variable frequency fan 141 can be adjusted according to the working state of the system, so as to reduce energy waste.
Further, the third temperature transmitter 70 is arranged on the converging pipeline 14, the third temperature transmitter 70 measures the temperature of the flue gas in the converging pipeline 14 and transmits a temperature signal, and the waste flue gas recycling system of the hot blast stove can adjust the openings of the first flow regulating valve 33 and the second flow regulating valve 43 according to the temperature of the flue gas in the converging pipeline 14, so that the temperature of the flue gas in the converging pipeline 14 is maintained in a certain range, and the stable operation of the waste heat utilization unit is ensured.
According to one embodiment of the present invention, as shown in fig. 2, a flue gas temperature increasing furnace 81 is provided on the drying line 15, an outlet of the flue gas temperature increasing furnace 81 is connected to a coal mill 80, and a fifth shut-off valve 72 is provided at an inlet of the flue gas temperature increasing furnace 81. The flue gas entering the drying pipeline 15 enters the flue gas temperature rising furnace 81 to be mixed with the burnt blast furnace gas, so that the temperature and the air quantity of the flue gas are further improved, and sufficient heat and air quantity are provided for drying the coal dust in the coal mill 80; the fifth shut-off valve 72 may close the drying line 15.
Specifically, as shown in fig. 2, in the secondary temperature adjustment unit 20:
the first protection Wen Zhiguan and the second heat-preserving branch pipe 22 are respectively connected at the inlet and the outlet of the flue gas temperature rising furnace 81, the flue gas with the temperature regulated at the first stage enters the first protection Wen Zhiguan, the temperature thereof is relatively low, and the flue gas with the temperature raised by the flue gas temperature rising furnace 81 enters the second heat-preserving branch pipe 22, the temperature thereof is relatively high; the low-temperature flue gas in the first protection Wen Zhiguan and the high-temperature flue gas in the second heat preservation branch pipe 22 enter the heat preservation main pipe 23 to carry out temperature adjustment, and the flue gas after temperature adjustment enters the heat exchange branch pipe 24 to be used for heating and heat preservation of the raw coal bin 82, the coal dust bin 83, the air pipe 84 for blowing and the fire-fighting water pipe 87.
According to an embodiment of the present invention, as shown in fig. 2, a third shut-off valve 50, a third flowmeter 51, and a third flow rate regulating valve 52 are provided on the first spool Wen Zhiguan 21; the second thermal insulation branch pipe 22 is provided with a fourth shut-off valve 60, a fourth flow meter 61 and a fourth flow rate regulating valve 62.
The third flowmeter 51 measures the flow rate of the flue gas in the first protector Wen Zhiguan, the third flow rate regulating valve 52 can control the size of the opening according to an external control signal so as to regulate the flow rate of the flue gas in the first protector Wen Zhiguan, and the third cut-off valve 50 can close the first protector Wen Zhiguan 21; the fourth flow meter 61 measures the flow rate of the flue gas in the second thermal insulation branch pipe 22, the fourth flow rate regulating valve 62 can control the opening size according to an external control signal so as to regulate the flow rate of the flue gas in the second thermal insulation branch pipe 22, and the fourth shut-off valve 60 can close the second thermal insulation branch pipe 22.
By controlling the third flow regulating valve 52 and the fourth flow regulating valve 62 in real time, the temperature and the flow of the flue gas entering the heat preservation main pipe 23 are regulated, and the heating and heat preservation effects of the raw coal bin 82, the pulverized coal bin 83, the air pipeline 84 for injection and the fire-fighting water pipe 87 are not good due to insufficient heat of the flue gas.
Further, as shown in fig. 2, the plurality of heat exchange branch pipes 24 connected to the heat preservation main pipe 23 include a first heat exchange branch pipe 241, a second heat exchange branch pipe 242, a third heat exchange branch pipe 243 and a fourth heat exchange branch pipe 244, wherein the first heat exchange branch pipe 241 is connected to the blowing heat exchanger 85 on the blowing air pipe 84 for heating and preserving heat of the blowing air pipe 84, and the second heat exchange branch pipe 242, the third heat exchange branch pipe 243 and the fourth heat exchange branch pipe 244 are respectively arranged outside the raw coal bin 82, outside the pulverized coal bin 83 and outside the fire water pipe 87 in a coiled manner for heating and preserving heat.
Specifically, as shown in fig. 2, a blowing heat exchanger 85 is connected to the blowing air pipe 84, and the gas (usually nitrogen or air) in the blowing air pipe 84 is subjected to heat exchange treatment with the flue gas in the first heat exchange branch pipe 241 by the blowing heat exchanger 85, so that the temperature of the gas in the blowing air pipe 84 is maintained above 60 ℃; the first heat exchanging branch pipe 241 is provided with a sixth shut-off valve 73, and the sixth shut-off valve 73 may close the first heat exchanging branch pipe 241. The second heat exchange branch pipe 242 and the third heat exchange branch pipe 243 are respectively arranged on the outer side of the raw coal bin 82 and the outer side of the pulverized coal bin 83 in a coiled manner, and the flue gas in the second heat exchange branch pipe 242 and the third heat exchange branch pipe 243 is used for heating and preserving the raw coal bin 82 and the pulverized coal bin 83, so that the raw coal in the raw coal bin 82 is prevented from caking to cause the failure of blanking, and saturated steam in the pulverized coal bin 83 is prevented from condensing; the second heat exchange branch pipe 242 and the third heat exchange branch pipe 243 are respectively provided with a seventh shut-off valve 74 and an eighth shut-off valve 75, the seventh shut-off valve 74 can close the second heat exchange branch pipe 242, and the eighth shut-off valve 75 can close the third heat exchange branch pipe 243. The fourth heat exchange branch pipe 244 can be arranged in parallel with the fire water pipe 87, and can also be arranged outside the fire water pipe 87 in a coiled manner and used for carrying out heat tracing and heat preservation on the fire water pipe 87; the fourth heat exchanging branch pipe 244 is provided with a ninth cut-off valve 76, and when the ambient temperature is lower than 5 ℃, the ninth cut-off valve 76 is opened to avoid freezing in the fire-fighting water pipe 87.
According to an embodiment of the present invention, as shown in fig. 2, a fourth temperature transmitter 71 is provided on the blowing gas pipe 84; the fourth temperature transmitter 71 measures the temperature of the gas in the air-blowing pipe 84 and transmits the temperature signal, and the waste flue gas recycling system of the hot blast stove can regulate and control the openings of the third flow regulating valve 52 and the fourth flow regulating valve 62 according to the temperature of the gas in the air-blowing pipe 84, so that the temperature of the gas in the air-blowing pipe 84 after heat exchange is maintained above 60 ℃.
Preferably, rock wool is arranged outside all pipelines in the waste flue gas recycling system of the hot blast stove for heat preservation, so that heat loss in the flue gas flowing process is reduced.
According to an embodiment of the present invention, as shown in fig. 2, the outlet pipe of the first heat exchanging branch pipe 241, the outlet pipe of the second heat exchanging branch pipe 242, the outlet pipe of the third heat exchanging branch pipe 243, and the outlet pipe of the fourth heat exchanging branch pipe 244 are connected to the main exhaust fan 89; the outlet of the coal mill 80 is connected with a cloth bag powder collector 88, and the cloth bag powder collector 88 is connected with the main exhaust fan 89.
Specifically, as shown in fig. 2, after the drying operation is completed, the flue gas entering the coal mill 80 through the drying pipeline 15 enters the bag-type powder collector 88 from the outlet of the coal mill 80, the bag-type powder collector 88 recovers the pulverized coal carried in the flue gas, and the pulverized coal is filtered by the bag-type powder collector 88 and is discharged into the atmosphere through the main exhaust fan 89.
The flue gas in the first heat exchanging branch pipe 241, the second heat exchanging branch pipe 242, the third heat exchanging branch pipe 243 and the fourth heat exchanging branch pipe 244 exchanges heat with the air pipe 84 for injection, the raw coal bunker 82, the pulverized coal bunker 83 and the fire-fighting water pipe 87 respectively, and is discharged into the atmosphere through the main exhaust fan 89.
According to one embodiment of the invention, the hot blast stove waste flue gas recycling system further comprises a control unit, wherein the control unit is electrically connected with the first temperature transmitter 30, the second temperature transmitter 40 and the third temperature transmitter 70 and can receive temperature signals measured by the transmitters; meanwhile, the control unit is electrically connected with the first flow regulating valve 33 and the second flow regulating valve 43, and can control the opening degree of the flow regulating valves, so as to regulate the temperature and flow of the flue gas entering the drying pipeline 15 from the converging pipeline 14.
The flue gas flow and/or the temperature in the converging pipeline 14 is set with a fixed threshold, and when the flue gas temperature and/or the flow in the converging pipeline 14 fluctuates and exceeds the fixed threshold, the control unit can control the opening of the first flow regulating valve 33 and/or the opening of the second flow regulating valve 43, so that the flue gas temperature and/or the flow in the converging pipeline 14 is maintained within a fixed range.
Further, the control unit is electrically connected with the fourth temperature transmitter 71, and can receive the temperature signal measured by the fourth temperature transmitter 71; meanwhile, the control unit is electrically connected with the third flow regulating valve 52 and the fourth flow regulating valve 62, and can control the opening degree of the flow regulating valves, thereby controlling the temperature and flow of the flue gas in the heat preservation main pipe 23.
The temperature of the gas in the blowing gas pipe 84 is maintained at 60 ℃ or higher, and the control unit can control the opening degree of the third flow rate adjustment valve 52 and/or the opening degree of the fourth flow rate adjustment valve 62 in a state where the temperature of the gas in the blowing gas pipe 84 is lower than 60 ℃, so that the temperature of the gas in the blowing gas pipe 84 is maintained at 60 ℃ or higher.
The working process of the waste flue gas recycling system of the hot blast stove is as follows:
when the powder-making and blowing station needs to work, that is, when the primary temperature regulating unit 10 in the invention works, the first cut-off valve 31 on the low-temperature exhaust gas pipeline 12 is opened first, then the fan 141 is opened, at this time, the second cut-off valve 41 on the high-temperature exhaust gas pipeline 13 is kept closed, the temperature of the outlet flue gas of the fan 141 can be set to be about 160 ℃ by the control unit, if the temperature of the flue gas in the low-temperature exhaust gas pipeline 12 is 140 ℃, at this time, the second cut-off valve 41 on the high-temperature exhaust gas pipeline 13 is opened, a proper amount of high-temperature flue gas before the hot blast stove heat exchanger 111 is introduced, the temperature of the flue gas is compensated, and the opening degree of the first flow regulating valve 33 and/or the opening degree of the second flow regulating valve 43 are controlled by the control unit, so that the temperature of the flue gas in the converging pipeline 14 is maintained at about 160 ℃. Meanwhile, the sixth shut-off valve 73, the seventh shut-off valve 74, the eighth shut-off valve 75, or the ninth shut-off valve 76 is selectively opened according to the heat tracing and insulation requirements of the raw coal bin 82, the pulverized coal bin 83, the air pipe 84 for injection, and the fire water pipe 87; and the opening of the third flow regulating valve 52 and/or the opening of the fourth flow regulating valve 62 are/is controlled by the control unit according to the temperature required by heat tracing and heat preservation, so that the temperature of the flue gas in the heat preservation main pipe 23 is adjusted in real time.
When the coal mill 80 and the flue gas temperature increasing furnace 81 stop working, the air quantity of the fan 141 can be adjusted to be small, the fifth cut-off valve 72 is closed, and heat preservation operation is continuously provided for the raw coal bin 82, the coal dust bin 83 and the air pipeline 84 for blowing.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (12)
1. A hot blast stove waste flue gas recycling system, comprising:
the primary temperature adjusting unit is provided with a diffusing pipeline, a low-temperature waste gas pipeline, a high-temperature waste gas pipeline, a converging pipeline and a drying pipeline connected with the converging pipeline, wherein the diffusing pipeline is provided with a hot blast stove heat exchanger, the low-temperature waste gas pipeline is connected with a low-temperature side port of the hot blast stove heat exchanger, the high-temperature waste gas pipeline is connected with a high-temperature side port of the hot blast stove heat exchanger, the converging pipeline is respectively connected with the low-temperature waste gas pipeline and the high-temperature waste gas pipeline, and the drying pipeline is connected with a coal mill;
the second-stage temperature regulating unit is provided with a first heat preservation Wen Zhiguan, a second heat preservation branch pipe, a heat preservation main pipe and a plurality of heat exchange branch pipes connected with the heat preservation main pipe, a flue gas temperature rising furnace is arranged on the drying pipeline, the first heat preservation Wen Zhiguan and the second heat preservation branch pipes are respectively connected with the inlet side and the outlet side of the flue gas temperature rising furnace, the heat preservation main pipe is respectively connected with the first heat preservation branch pipes and the second heat preservation branch pipes, and the plurality of heat exchange branch pipes are respectively arranged on the outer side of a raw coal bin, the outer side of a pulverized coal bin, the outer side of a fire-fighting water pipe and a blowing heat exchanger connected to a blowing gas pipeline.
2. The hot blast stove waste flue gas recycling system according to claim 1, wherein a fan is arranged on the converging pipeline, and the fan is positioned at the upstream end of the drying pipeline.
3. The hot blast stove waste flue gas recycling system according to claim 2, wherein the low temperature waste gas pipeline is provided with a first temperature transmitter, a first shut-off valve, a first flowmeter and a first flow regulating valve; and the high-temperature exhaust gas pipeline is provided with a second temperature transmitter, a second shut-off valve, a second flowmeter and a second flow regulating valve.
4. A hot blast stove waste flue gas recycling system according to claim 3, wherein the first thermal insulation branch pipe is provided with a third cut-off valve, a third flowmeter and a third flow regulating valve, and the second thermal insulation branch pipe is provided with a fourth cut-off valve, a fourth flowmeter and a fourth flow regulating valve.
5. The hot blast stove waste gas recycling system according to claim 4, wherein the converging pipeline is provided with a third temperature transmitter, the blowing gas pipeline is provided with a fourth temperature transmitter, and a fifth cut-off valve is arranged at the inlet of the flue gas temperature rising furnace.
6. The hot blast stove waste flue gas recycling system according to claim 1 or 2, wherein the plurality of heat exchange branch pipes comprises a first heat exchange branch pipe, a second heat exchange branch pipe, a third heat exchange branch pipe and a fourth heat exchange branch pipe, the first heat exchange branch pipe is connected with the blowing heat exchanger, and the second heat exchange branch pipe, the third heat exchange branch pipe and the fourth heat exchange branch pipe are respectively arranged on the outer side of the raw coal bin, the outer side of the pulverized coal bin and the outer side of the fire-fighting water pipe in a coiled mode.
7. The hot blast stove waste flue gas recycling system according to claim 6, wherein a sixth shut-off valve, a seventh shut-off valve, an eighth shut-off valve and a ninth shut-off valve are respectively arranged on the first heat exchange branch pipe, the second heat exchange branch pipe, the third heat exchange branch pipe and the fourth heat exchange branch pipe.
8. The hot blast stove waste flue gas recycling system according to claim 1, wherein the outlet of the diffusing pipeline is connected with a hot blast stove chimney, and a tenth shut-off valve is arranged on a pipeline between the hot blast stove heat exchanger and the hot blast stove chimney.
9. The hot blast stove waste flue gas recycling system according to claim 8, wherein a hot blast stove desulfurization device is arranged between the hot blast stove heat exchanger and the hot blast stove chimney, and the desulfurization device is arranged in parallel with the tenth shut-off valve.
10. The hot blast stove waste flue gas recycling system according to claim 6, wherein the outlet pipe of the first heat exchanging branch pipe, the outlet pipe of the second heat exchanging branch pipe, the outlet pipe of the third heat exchanging branch pipe and the outlet pipe of the fourth heat exchanging branch pipe are connected with a main exhaust fan; the outlet of the coal mill is connected with a cloth bag powder collector, and the cloth bag powder collector is connected with the main exhaust fan.
11. A hot blast stove waste flue gas recycling system according to claim 3, characterized in that the hot blast stove waste flue gas recycling system further comprises a control unit capable of controlling the opening size of the first flow regulating valve and/or the opening size of the second flow regulating valve in a state in which the flue gas temperature and/or flue gas flow in the converging line exceeds a first set threshold.
12. The hot blast stove waste flue gas recycling system according to claim 4, further comprising a control unit, wherein the control unit can control the opening degree of the third flow regulating valve and/or the opening degree of the fourth flow regulating valve in a state that the flue gas temperature and/or the flue gas flow rate in the heat preservation main pipe exceeds a second set threshold value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310602126.5A CN116516092A (en) | 2023-05-25 | 2023-05-25 | Waste flue gas recycling system of hot blast stove |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310602126.5A CN116516092A (en) | 2023-05-25 | 2023-05-25 | Waste flue gas recycling system of hot blast stove |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117282529A (en) * | 2023-09-28 | 2023-12-26 | 扬州一川镍业有限公司 | Heat recycling device and method for preparing pulverized coal by using same |
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- 2023-05-25 CN CN202310602126.5A patent/CN116516092A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117282529A (en) * | 2023-09-28 | 2023-12-26 | 扬州一川镍业有限公司 | Heat recycling device and method for preparing pulverized coal by using same |
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