CN111118245A - High-temperature preheating system and method for hot blast stove - Google Patents
High-temperature preheating system and method for hot blast stove Download PDFInfo
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- CN111118245A CN111118245A CN202010080744.4A CN202010080744A CN111118245A CN 111118245 A CN111118245 A CN 111118245A CN 202010080744 A CN202010080744 A CN 202010080744A CN 111118245 A CN111118245 A CN 111118245A
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000007789 gas Substances 0.000 claims abstract description 228
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 186
- 239000003546 flue gas Substances 0.000 claims abstract description 186
- 238000002485 combustion reaction Methods 0.000 claims description 152
- 239000003034 coal gas Substances 0.000 claims description 24
- 230000001105 regulatory effect Effects 0.000 claims description 12
- 239000000779 smoke Substances 0.000 claims description 10
- 239000000567 combustion gas Substances 0.000 claims 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 238000004891 communication Methods 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000000571 coke Substances 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
- C21B9/14—Preheating the combustion air
-
- 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
Abstract
The invention discloses a high-temperature preheating system and method for a hot blast stove, and belongs to the technical field of blast furnace ironmaking. The hot blast stove high-temperature preheating system comprises: the low-temperature gas pipeline is communicated with a gas inlet end of the gas pipe type heat exchanger, and the high-temperature gas pipeline is communicated with a gas outlet end of the gas pipe type heat exchanger; the normal-temperature combustion-supporting air pipeline is communicated with an air inlet end of the air plate type heat exchanger, and the high-temperature combustion-supporting air pipeline is communicated with an air outlet end of the air plate type heat exchanger; the gas inlet end of the high-temperature flue gas supply device is communicated with the low-temperature gas pipeline, and the gas outlet end of the high-temperature flue gas supply device is communicated with the first gas inlet end of the flue gas mixing chamber; the flue main pipe of the hot blast stove is communicated with the second air inlet end of the flue gas mixing chamber. The high-temperature preheating system and the high-temperature preheating method for the hot blast stove can realize high air temperature, and have the advantages of simple flow, safety, reliability, low investment, low operation cost and long service life.
Description
Technical Field
The invention relates to the technical field of blast furnace ironmaking, in particular to a high-temperature preheating system and a high-temperature preheating method for a hot blast stove.
Background
Nowadays, through the efforts of several generations, the development direction of the blast furnace iron-making process is already clear, and the high air temperature is more and more paid attention to as an important principle. The hot air temperature is increased, the coal injection quantity can be increased, the coke ratio is reduced, the coke resource is saved, and the method has certain promotion effects on enhancing blast furnace smelting, increasing molten iron yield, reducing environmental pollution and the like. The method for directly burning the blast furnace gas in the hot blast furnace system in the iron and steel integrated enterprise to improve the wind temperature is the most efficient method which can be found at present, and the power generation efficiency is improved by 30-40% compared with that of the blast furnace gas in the iron and steel integrated enterprise.
In the past years, a simpler mode is often adopted for improving the temperature of hot air, namely, a certain amount of high-heat-value gas such as coke oven gas, converter gas and the like is doped in blast furnace gas; with the technical development of the metallurgical industry, high-calorific-value gas of various iron and steel plants is more and more tense, and even some iron and steel plants do not have usable high-calorific-value gas, so that people are forced to use single low-calorific-value blast furnace gas and add a high-temperature preheating system to realize high air temperature (1250 ℃ and above).
Through technological development for many years, a high-temperature preheating system has formed multiple modes, namely, an ① high-temperature air preheating furnace and a mixed air furnace, ② 4 hot blast furnaces, 2 combustion furnaces, 1 air supply and 1 preheating furnace, ③ hot blast furnaces with high-temperature flue gas pipelines and heat exchangers, ④ combustion furnaces and heat exchangers are combined, and the heat exchangers are plate type and tube type heat exchangers.
Disclosure of Invention
The invention provides a high-temperature preheating system and a high-temperature preheating method for a hot blast stove, and solves or partially solves the technical problems of potential safety hazard, high investment, high operation cost and short service life of a high-temperature preheating system in the prior art.
In order to solve the technical problem, the invention provides a high-temperature preheating system of a hot blast stove, which comprises: the system comprises a low-temperature gas pipeline, a gas pipe type heat exchanger, a high-temperature gas pipeline, a normal-temperature combustion air pipeline, an air plate type heat exchanger, a high-temperature combustion air pipeline, a high-temperature flue gas supply device, a hot blast stove flue header pipe, a flue gas mixing chamber, a first flue pipe, a second flue pipe, a third flue pipe, a fourth flue pipe and a chimney; the low-temperature gas pipeline is communicated with a gas inlet end of the gas pipe type heat exchanger, and the high-temperature gas pipeline is communicated with a gas outlet end of the gas pipe type heat exchanger; the normal-temperature combustion-supporting air pipeline is communicated with an air inlet end of the air plate type heat exchanger, and the high-temperature combustion-supporting air pipeline is communicated with an air outlet end of the air plate type heat exchanger; the gas inlet end of the high-temperature flue gas supply device is communicated with the low-temperature gas pipeline, and the gas outlet end of the high-temperature flue gas supply device is communicated with the first gas inlet end of the flue gas mixing chamber; the main flue pipe of the hot blast stove is communicated with the second air inlet end of the flue gas mixing chamber; the gas inlet end of the first flue pipe is communicated with the gas outlet end of the flue gas mixing chamber, and the gas outlet end of the first flue pipe is communicated with the flue gas inlet end of the gas pipe type heat exchanger; the gas inlet end of the second flue pipe is communicated with the gas outlet end of the gas pipe type heat exchanger, and the gas outlet end of the second flue pipe is communicated with the chimney; the air inlet end of the third flue pipe is communicated with the air outlet end of the flue gas mixing chamber, and the air outlet end of the third flue pipe is communicated with the flue gas inlet end of the air plate type heat exchanger; and the air inlet end of the fourth flue pipe is communicated with the flue gas outlet end of the air plate type heat exchanger, and the air outlet end of the fourth flue pipe is communicated with the chimney.
Further, a first flue adjusting and cutting valve is arranged on the first flue pipe; a second flue adjusting cut-off valve is arranged on the third flue pipe; the low-temperature gas pipeline is provided with a first cut-off valve; a second cut-off valve is arranged on the high-temperature gas pipeline; a third cut-off valve is arranged on the normal-temperature combustion air pipeline; a fourth cut-off valve is arranged on the high-temperature combustion air pipeline; a first flue valve is arranged on the second flue pipe; and a second flue valve is arranged on the fourth flue pipe.
Further, the high-temperature flue gas supply device comprises: the device comprises a combustion furnace gas pipeline, a combustion furnace, a combustion-supporting air pipeline of the combustion furnace and a high-temperature flue pipe; the gas inlet end of the combustion furnace gas pipeline is communicated with the low-temperature gas pipeline, and the gas outlet end of the combustion furnace gas pipeline is communicated with the first gas inlet end of the combustion furnace; the air outlet end of the combustion air pipeline of the combustion furnace is communicated with the second air inlet end of the combustion furnace; and the air outlet end of the high-temperature flue pipe is communicated with the second air inlet end of the flue gas mixing chamber.
Further, the air outlet end of the high-temperature flue pipe is communicated with the bottom of the flue gas mixing chamber.
Furthermore, a combustion furnace gas regulating valve, a fifth cut-off valve and a combustion furnace gas combustion valve are arranged on the combustion furnace gas pipeline, the fifth cut-off valve is arranged between the combustion furnace gas regulating valve and the combustion furnace gas combustion valve, and the combustion furnace gas combustion valve is arranged between the fifth cut-off valve and the first gas inlet end of the combustion furnace; and the combustion-supporting air pipeline of the combustion furnace is provided with a combustion-supporting air regulating valve of the combustion furnace and a combustion-supporting air combustion valve of the combustion furnace, and the combustion-supporting air combustion valve of the combustion furnace is arranged between the combustion-supporting air regulating valve of the combustion furnace and the second air inlet end of the combustion furnace.
Further, the high-temperature flue gas supply device further comprises: a combustion fan of the combustion furnace; and the air outlet end of the combustion-supporting fan of the combustion furnace is communicated with the air inlet end of the combustion-supporting air pipeline of the combustion furnace.
Furthermore, the flue main pipe of the hot blast stove and the flue gas mixing chamber are coaxially arranged.
Further, a spoiler is arranged in the smoke mixing chamber.
Further, the hot blast stove high-temperature preheating system further comprises: the first communicating pipeline, the second communicating pipeline and the third communicating pipeline; the gas inlet end of the first communicating pipeline is communicated with the low-temperature gas pipeline, and the gas outlet end of the first communicating pipeline is communicated with the high-temperature gas pipeline; the air inlet end of the second communicating pipeline is communicated with the normal-temperature combustion air pipeline, and the air outlet end of the second communicating pipeline is communicated with the high-temperature combustion air pipeline; the air inlet end of the third communicating pipeline is communicated with the air outlet end of the flue gas mixing chamber, and the air outlet end of the third communicating pipeline is communicated with the chimney; the first communicating pipeline is provided with a sixth cut-off valve, the second communicating pipeline is provided with a seventh cut-off valve, and the third communicating pipeline is provided with an eighth cut-off valve.
Based on the same inventive concept, the invention also provides a high-temperature preheating method of the hot blast stove, which comprises the following steps: part of the coal gas pipe network enters a high-temperature flue gas supply device, and part of the coal gas is combusted in the high-temperature flue gas supply device to generate high-temperature flue gas which is conveyed to a flue gas mixing chamber; the flue main pipe of the hot blast stove conveys the flue gas of the hot blast stove generated by the hot blast stove to the flue gas mixing chamber; after the high-temperature flue gas and the flue gas of the hot blast stove are mixed in the flue gas mixing chamber, the mixed flue gas is conveyed to the gas pipe type heat exchanger through a first flue pipe and is conveyed to the air plate type heat exchanger through a third flue pipe; the low-temperature gas pipeline conveys the gas of the other part of the gas pipe network to the gas pipe type heat exchanger, the gas of the other part and the high-temperature flue gas exchange heat in the gas pipe type heat exchanger, the other part of the gas after heat exchange is conveyed to the hot blast stove through the high-temperature gas pipeline, and the high-temperature flue gas after heat exchange is conveyed to the chimney through the second flue; the normal-temperature combustion-supporting air pipeline conveys combustion-supporting air to the air plate heat exchanger, the air and the high-temperature flue gas exchange heat in the air plate heat exchanger, the air after heat exchange is conveyed to the hot blast stove through the high-temperature combustion-supporting air pipeline, and the high-temperature flue gas after heat exchange is conveyed to the chimney through the fourth flue.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
because the low-temperature gas pipeline is communicated with the gas inlet end of the gas pipe type heat exchanger, the high-temperature gas pipeline is communicated with the gas outlet end of the gas pipe type heat exchanger, the normal-temperature combustion-supporting air pipeline is communicated with the air inlet end of the air plate type heat exchanger, and the high-temperature combustion-supporting air pipeline is communicated with the air outlet end of the air plate type heat exchanger, the low-temperature gas pipeline is externally connected with a gas pipe network to convey most of gas of the gas pipe network to the gas pipe type heat exchanger, the normal-temperature combustion-supporting air pipeline conveys outside combustion-supporting air to the air plate type heat exchanger, the gas pipe type heat exchanger adopts a combined preheating mode of the gas pipe type heat exchanger and the air plate type heat exchanger, the gas pipe type heat exchanger is corrosion-resistant, has high safety coefficient, few platform arrangement and small smoke gas resistance loss, the air plate type heat exchanger is, the high-temperature flue gas induced draft fan is not needed to be arranged, powerful conditions are created, the air inlet end of the high-temperature flue gas supply device is communicated with the low-temperature gas pipeline, the air outlet end of the high-temperature flue gas supply device is communicated with the first air inlet end of the flue gas mixing chamber, the main flue pipe of the hot blast stove is communicated with the second air inlet end of the flue gas mixing chamber, so that the other part of the gas pipe network enters the high-temperature flue gas supply device through the low-temperature gas pipeline, the other part of the gas is combusted in the high-temperature flue gas supply device to generate high-temperature flue gas which is conveyed to the flue gas mixing chamber, the main flue pipe of the hot blast stove conveys the flue gas generated by the hot blast stove to the flue gas mixing chamber, the high-temperature flue gas and the flue gas of the hot blast stove are mixed in the flue gas mixing chamber, the, the material consumption and the operation cost are also saved, because the air inlet end of the first flue pipe is communicated with the air outlet end of the flue gas mixing chamber, the air outlet end of the first flue pipe is communicated with the flue gas inlet end of the gas pipe type heat exchanger, the air inlet end of the second flue pipe is communicated with the flue gas outlet end of the gas pipe type heat exchanger, the air outlet end of the second flue pipe is communicated with the chimney, the air inlet end of the third flue pipe is communicated with the air outlet end of the flue gas mixing chamber, the air outlet end of the third flue pipe is communicated with the flue gas inlet end of the air plate type heat exchanger, the air inlet end of the fourth flue pipe is communicated with the flue gas outlet end of the air plate type heat exchanger, and the air outlet end of the fourth flue pipe is communicated with the chimney, the mixed high-temperature flue gas and the flue gas of the hot blast stove are conveyed to the gas pipe type heat exchanger through the first flue pipe and are conveyed to the air plate type heat exchanger through the third flue pipe, and the high-temperature flue gas exchanges heat with a part, a part of coal gas after heat exchange is conveyed to the hot blast stove through a high-temperature coal gas pipeline, high-temperature flue gas after heat exchange is conveyed to the chimney through a second flue, the high-temperature flue gas exchanges heat with combustion-supporting air in the air plate heat exchanger, the air after heat exchange is conveyed to the hot blast stove through a high-temperature combustion-supporting air pipeline, and the high-temperature flue gas after heat exchange is conveyed to the chimney through a fourth flue.
Drawings
FIG. 1 is a schematic structural diagram of a high-temperature preheating system of a hot blast stove provided by an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a flue gas mixing chamber in the high-temperature preheating system of the hot blast stove in FIG. 1;
FIG. 3 is a schematic view of the installation of the spoiler in the flue gas mixing chamber of FIG. 2.
Detailed Description
Referring to fig. 1, a high-temperature preheating system of a hot blast stove provided by the embodiment of the present invention includes: the system comprises a low-temperature gas pipeline 1, a gas pipe type heat exchanger 2, a high-temperature gas pipeline 3, a normal-temperature combustion air pipeline 4, an air plate type heat exchanger 5, a high-temperature combustion air pipeline 6, a high-temperature flue gas supply device 7, a hot blast stove flue header 8, a flue gas mixing chamber 9, a first flue pipe 10, a second flue pipe 11, a third flue pipe 12, a fourth flue pipe 13 and a chimney 14.
The low-temperature gas pipeline 1 is communicated with a gas inlet end of the gas pipe type heat exchanger 2, and the high-temperature gas pipeline 3 is communicated with a gas outlet end of the gas pipe type heat exchanger 2.
The normal-temperature combustion-supporting air pipeline 4 is communicated with an air inlet end of the air plate type heat exchanger 5, and the high-temperature combustion-supporting air pipeline 6 is communicated with an air outlet end of the air plate type heat exchanger 5.
The air inlet end of the high-temperature flue gas supply device 7 is communicated with the low-temperature gas pipeline 1, and the air outlet end of the high-temperature flue gas supply device 7 is communicated with the first air inlet end of the flue gas mixing chamber 9.
The flue header pipe 8 of the hot blast stove is communicated with the second air inlet end of the flue gas mixing chamber 9.
The air inlet end of the first flue pipe 10 is communicated with the air outlet end of the flue gas mixing chamber 9, and the air outlet end of the first flue pipe 10 is communicated with the flue gas inlet end of the gas pipe type heat exchanger 2.
The gas inlet end of the second flue pipe 11 is communicated with the gas outlet end of the gas pipe type heat exchanger 2, and the gas outlet end of the second flue pipe 11 is communicated with the chimney 14.
The air inlet end of the third flue pipe 12 is communicated with the air outlet end of the flue gas mixing chamber 9, and the air outlet end of the third flue pipe 12 is communicated with the flue gas inlet end of the air plate type heat exchanger 5.
The air inlet end of the fourth flue pipe 13 is communicated with the flue gas outlet end of the air plate type heat exchanger 5, and the air outlet end of the fourth flue pipe 13 is communicated with the chimney 14.
In the embodiment of the application, because the low-temperature gas pipeline 1 is communicated with the gas inlet end of the gas pipe type heat exchanger 2, the high-temperature gas pipeline 3 is communicated with the gas outlet end of the gas pipe type heat exchanger 2, the normal-temperature combustion-supporting air pipeline 4 is communicated with the air inlet end of the air plate type heat exchanger 5, and the high-temperature combustion-supporting air pipeline 6 is communicated with the air outlet end of the air plate type heat exchanger 5, the low-temperature gas pipeline 1 is externally connected with the gas pipe network 15, most of gas in the gas pipe network 15 is conveyed to the gas pipe type heat exchanger 2, the normal-temperature combustion-supporting air pipeline 4 conveys external combustion-supporting air to the air plate type heat exchanger 5, a combined preheating mode of the gas pipe type heat exchanger 2 and the air plate type heat exchanger 5 is adopted, the safety coefficient of the gas pipe type heat exchanger 2 is high, the corrosion resistance is high, the heat exchange efficiency is high, the combination mode of the two is used, a powerful condition is created for arranging a mixing chamber on a flue main pipe 8 of the hot blast stove without arranging a high-temperature flue gas induced draft fan, because the air inlet end of a high-temperature flue gas supply device 7 is communicated with a low-temperature gas pipeline 1, the air outlet end of the high-temperature flue gas supply device 7 is communicated with a first air inlet end of a flue gas mixing chamber 9, and the flue main pipe 8 of the hot blast stove is communicated with a second air inlet end of the flue gas mixing chamber 9, therefore, the other part of the gas of a gas pipeline network 15 enters the high-temperature flue gas supply device 7 through the low-temperature gas pipeline 1, the other part of the gas is combusted in the high-temperature flue gas supply device 7 to generate high-temperature flue gas which is conveyed to the flue gas mixing chamber 9, the flue main pipe 8 of the hot blast stove conveys the flue gas of the hot blast stove to the flue gas mixing, the air inlet end of the first flue pipe 10 is communicated with the air outlet end of the gas pipe type heat exchanger 2, the air outlet end of the second flue pipe 11 is communicated with the flue gas outlet end of the gas pipe type heat exchanger 2, the air outlet end of the second flue pipe 11 is communicated with the chimney 14, the air inlet end of the third flue pipe 12 is communicated with the air outlet end of the flue gas mixing chamber 9, the air outlet end of the third flue pipe 12 is communicated with the flue gas inlet end of the air plate type heat exchanger 5, the air inlet end of the fourth flue pipe 13 is communicated with the flue gas end of the air plate type heat exchanger 5, the air outlet end of the fourth flue pipe 13 is communicated with the air outlet chimney 14, so that the mixed high-temperature flue gas and flue gas are conveyed to the gas pipe type heat exchanger 2 through the first flue pipe 10, the high-temperature flue gas is conveyed to the air plate heat exchanger 5 through the third flue pipe 12, the high-temperature flue gas exchanges heat with part of the coal gas in the coal gas pipe heat exchanger 2, part of the coal gas after heat exchange is conveyed to the hot blast stove through the high-temperature coal gas pipeline 3, the high-temperature flue gas after heat exchange is conveyed to the chimney through the second flue 11, the high-temperature flue gas exchanges heat with combustion-supporting air in the air plate heat exchanger 5, the air after heat exchange is conveyed to the hot blast stove through the high-temperature combustion-supporting air pipeline 6, and the high-temperature flue gas after heat exchange is conveyed to the chimney through the fourth flue 13.
Specifically, 2 heat exchange tube arrays of gas tubular heat exchanger of this application are vertical arranges, and double-box body parallel arrangement uses in series, and the shell side is walked to the flue gas, and the pipe side is walked to coal gas, and is anticorrosive, and factor of safety is high, and the platform is arranged fewly, and the flue gas hinders and decreases for a short time. The air preheats and chooses air plate heat exchanger 5 for use of this application, and occupation of land space is little, and heat exchange efficiency is high, uses both combination mode, also can set up the flue gas mixing chamber on hot-blast furnace flue house steward for this high temperature preheating device, need not set up high temperature flue gas draught fan and has created the forceful condition.
Specifically, the first flue pipe 10 is provided with a first flue adjusting and cut-off valve 16, and the flue gas volume of the high-temperature flue gas entering the gas pipe heat exchanger 2 can be controlled by adjusting the opening degree of the first flue adjusting and cut-off valve 16, so that the temperature of the preheated gas can be controlled.
The third flue pipe 12 is provided with a second flue adjusting and cutting valve 17, and the flue gas volume of the high-temperature flue gas entering the air plate heat exchanger 5 can be controlled by adjusting the opening degree of the second flue adjusting and cutting valve 17, so that the temperature of the preheated combustion-supporting air is controlled.
The low-temperature gas pipeline 1 is provided with a first cut-off valve 18, the high-temperature gas pipeline 3 is provided with a second cut-off valve 19, the normal-temperature combustion air pipeline 4 is provided with a third cut-off valve 20, the high-temperature combustion air pipeline 6 is provided with a fourth cut-off valve 21, the second flue pipe 11 is provided with a first flue valve 22, and the fourth flue pipe 13 is provided with a second flue valve 23.
When preheating the coal gas and the combustion air, the first cut-off valve 18, the second cut-off valve 19, the third cut-off valve 20, the fourth cut-off valve 21, the first flue valve 22 and the second flue valve 23 are all in an open state, and when the equipment is to be overhauled, the first cut-off valve 18, the second cut-off valve 19, the third cut-off valve 20, the fourth cut-off valve 21, the first flue valve 22 and the second flue valve 23 are all in a closed state.
Specifically, the high-temperature flue gas supply device 7 includes: a gas pipeline 7-1, a combustion furnace 7-2, a combustion air pipeline 7-3 of the combustion furnace and a high-temperature flue pipe 7-4.
The gas inlet end of the combustion furnace gas pipeline 7-1 is communicated with the low-temperature gas pipeline 1, and the gas outlet end of the combustion furnace gas pipeline 7-1 is communicated with the first gas inlet end of the combustion furnace 7-2.
The air outlet end of the combustion air pipeline 7-3 of the combustion furnace is communicated with the second air inlet end of the combustion furnace 7-2.
The air inlet end of the high-temperature flue pipe 7-4 is communicated with the air outlet end of the combustion furnace 7-2, and the air outlet end of the high-temperature flue pipe 7-4 is communicated with the second air inlet end of the flue gas mixing chamber 9.
The combustion furnace gas pipeline 7-1 conveys part of the gas in the low-temperature gas pipeline 1 to the combustion furnace 7-2, combustion-supporting air of the combustion furnace enters the combustion furnace 7-2 through the combustion-supporting air pipeline 7-3 of the combustion furnace, so that the gas and the combustion-supporting air are combusted in the combustion furnace to generate high-temperature flue gas, and the high-temperature flue gas enters the flue gas mixing chamber 9 through the high-temperature flue pipe 7-4.
The air outlet end of the high-temperature flue pipe 7-4 is communicated with the bottom of the flue gas mixing chamber 9, so that high-temperature flue gas generated by the combustion furnace 7-2 can conveniently enter the flue gas mixing chamber 9, and the high-temperature flue gas can be conveniently mixed with hot blast stove flue gas generated by a hot blast stove. In the present embodiment, the outlet end of the high temperature flue pipe 7-4 can communicate with the bottom of the flue gas mixing chamber 9 through a connecting pipe 7-11.
The combustion furnace gas pipeline 7-1 is provided with a combustion furnace gas regulating valve 7-5, a fifth stop valve 7-6 and a combustion furnace gas combustion valve 7-7, the fifth stop valve 7-6 is arranged between the combustion furnace gas regulating valve 7-5 and the combustion furnace gas combustion valve 7-7, and the combustion furnace gas combustion valve 7-7 is arranged between the fifth stop valve 7-6 and the first gas inlet end of the combustion furnace 7-2.
The combustion air pipeline 7-3 of the combustion furnace is provided with a combustion air regulating valve 7-8 of the combustion furnace and a combustion air combustion valve 7-9 of the combustion furnace, and the combustion air combustion valve 7-9 of the combustion furnace is arranged between the combustion air regulating valve 7-8 of the combustion furnace and the second air inlet end of the combustion furnace 7-2.
The gas flow entering the combustion furnace 7-2 can be controlled by adjusting the opening of the combustion furnace gas adjusting valve 7-5, and the air flow entering the combustion furnace 7-2 can be controlled by adjusting the combustion-supporting air adjusting valve 7-8 of the combustion furnace, so that the flue gas amount and the flue gas temperature generated by the combustion furnace 7-2 can be controlled.
The gas combustion valve 7-7 of the combustion furnace and the combustion-supporting air combustion valve 7-9 of the combustion furnace are convenient for gas combustion.
When preheating the coal gas and the combustion air, the fifth cut-off valve 7-6 is in an open state, and when the equipment is required to be overhauled, the fifth cut-off valve 7-6 is in a closed state.
The temperature is adjusted and controlled by three valves or four valves, namely, the air and gas flow of the combustion furnace is adjusted by the combustion furnace gas adjusting valve 7-5 and the combustion furnace combustion air adjusting valve 7-8, the two valves are used for adjusting the air and gas flow of the combustion furnace and controlling the smoke gas amount and the smoke gas temperature generated by the combustion furnace 7-2, meanwhile, a first smoke flue adjusting and cutting valve 16 is arranged on a first smoke flue pipe 10 or a second smoke flue adjusting and cutting valve 17 is arranged on a third smoke flue pipe 12, and the smoke gas amount flowing into the air plate type heat exchanger 5 and the gas pipe type heat exchanger 2 is adjusted in a certain range through the valves, so that the temperature after air and gas preheating is controlled.
The high-temperature flue gas supply device further comprises: combustion fan 7-10 of combustion furnace.
The air outlet end of the combustion-supporting fan 7-10 of the combustion furnace is communicated with the air inlet end of the combustion-supporting air pipeline 7-3 of the combustion furnace.
And a combustion-supporting fan 7-10 of the combustion furnace acts to generate combustion-supporting air of the combustion furnace, and the combustion-supporting air enters the combustion furnace 7-2 through a combustion-supporting air pipeline 7-3 of the combustion furnace.
Referring to fig. 2-3, in particular, the flue header pipe 8 of the hot blast stove is coaxially arranged with the flue gas mixing chamber 9, so that the flue gas of the hot blast stove conveyed by the flue header pipe 8 of the hot blast stove can conveniently enter the flue gas mixing chamber 9.
The flue gas mixing chamber 9 is internally provided with a spoiler 24, and the high-temperature flue gas generated by the combustion furnace 7-2 is fully mixed with the hot blast furnace flue gas conveyed by the hot blast furnace flue main pipe 8 in a short distance through the spoiler 24.
Specifically, hot-blast furnace high temperature preheating system still includes: a first communication duct 25, a second communication duct 26 and a third communication duct 27.
The gas inlet end of the first communicating pipeline 25 is communicated with the low-temperature gas pipeline 1, and the gas outlet end of the first communicating pipeline 25 is communicated with the high-temperature gas pipeline 3.
The air inlet end of the second communicating pipeline 26 is communicated with the normal-temperature combustion air pipeline 4, and the air outlet end of the second communicating pipeline 26 is communicated with the high-temperature combustion air pipeline 6.
The air inlet end of the third communicating pipeline 27 is communicated with the air outlet end of the flue gas mixing chamber 9, and the air outlet end of the third communicating pipeline 27 is communicated with the chimney 14.
A sixth shut-off valve 28 is provided in the first communication line 25, a seventh shut-off valve 29 is provided in the second communication line 26, and an eighth shut-off valve 30 is provided in the third communication line 27.
When preheating coal gas and combustion-supporting air, the sixth stop valve 28, the seventh stop valve 29 and the eighth stop valve 30 are in a closed state, when equipment is to be overhauled, the sixth stop valve 28, the seventh stop valve 29 and the eighth stop valve 30 are in an open state, coal gas sequentially passes through the low-temperature gas pipeline 1, the first communicating pipeline 25 and the high-temperature gas pipeline 3 to enter the hot blast stove, combustion-supporting air sequentially passes through the normal-temperature combustion-supporting air pipeline 4, the second communicating pipeline 26 and the high-temperature combustion-supporting air pipeline to enter the hot blast stove, high-temperature flue gas sequentially passes through the flue gas mixing chamber 9 and the third communicating pipeline 27 to enter the chimney 14, normal operation of the hot blast stove is guaranteed.
Based on the same inventive concept, the application also provides a high-temperature preheating method of the hot blast stove, which comprises the following steps:
And 2, conveying the hot blast furnace flue gas generated by the hot blast furnace to a flue gas mixing chamber 9 by a hot blast furnace flue main pipe 8.
And 3, mixing the high-temperature flue gas and the flue gas of the hot blast stove in a flue gas mixing chamber 9, conveying the mixed flue gas to the gas pipe type heat exchanger 2 through a first flue pipe 10, and conveying the mixed flue gas to the air plate type heat exchanger 5 through a third flue pipe 12.
And 4, conveying the other part of the coal gas pipe network 15 to the coal gas pipe type heat exchanger 2 by the low-temperature coal gas pipeline 1, exchanging heat between the other part of the coal gas and the high-temperature flue gas in the coal gas pipe type heat exchanger 5, conveying the other part of the coal gas after heat exchange to the hot blast stove through the high-temperature coal gas pipeline 3, and conveying the high-temperature flue gas after heat exchange to a chimney 14 through a second flue 11.
And 5, delivering combustion-supporting air to an air plate heat exchanger 5 through a normal-temperature combustion-supporting air pipeline 4, exchanging heat between the air and high-temperature flue gas in the air plate heat exchanger 5, delivering the heat-exchanged air to a hot blast stove through a high-temperature combustion-supporting air pipeline 6, and delivering the heat-exchanged high-temperature flue gas to a chimney 14 through a fourth flue 13.
In order to more clearly describe the embodiments of the present invention, the following description is made in terms of the method of using the embodiments of the present invention.
The combustion furnace gas pipeline 7-1 conveys part of the gas in the low-temperature gas pipeline 1 to the combustion furnace 7-2, combustion-supporting air of the combustion furnace enters the combustion furnace 7-2 through the combustion-supporting air pipeline 7-3 of the combustion furnace, so that the gas and the combustion-supporting air are combusted in the combustion furnace to generate high-temperature flue gas, and the high-temperature flue gas enters the flue gas mixing chamber 9 through the high-temperature flue pipe 7-4.
The flue header pipe 8 of the hot blast stove conveys the flue gas of the hot blast stove generated by the hot blast stove to a flue gas mixing chamber 9. After being mixed in the flue gas mixing chamber 9, the high-temperature flue gas and the flue gas of the hot blast stove are conveyed to the gas tubular heat exchanger 2 through the first flue pipe 10 and conveyed to the air plate type heat exchanger 5 through the third flue pipe 12.
The low-temperature gas pipeline 1 conveys the other part of the gas pipeline network 15 to the gas pipeline type heat exchanger 2, the other part of the gas exchanges heat with the high-temperature flue gas in the gas pipeline type heat exchanger 5, the other part of the gas after heat exchange is conveyed to the hot blast stove through the high-temperature gas pipeline 3, and the high-temperature flue gas after heat exchange is conveyed to the chimney 14 through the second flue 11.
The normal-temperature combustion-supporting air pipeline 4 conveys combustion-supporting air to the air plate heat exchanger 5, the air and high-temperature flue gas exchange heat in the air plate heat exchanger 5, the air after heat exchange is conveyed to the hot blast stove through the high-temperature combustion-supporting air pipeline 6, and the high-temperature flue gas after heat exchange is conveyed to the chimney 14 through the fourth flue 13.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (10)
1. The utility model provides a hot-blast furnace high temperature system of preheating which characterized in that includes: the system comprises a low-temperature gas pipeline, a gas pipe type heat exchanger, a high-temperature gas pipeline, a normal-temperature combustion air pipeline, an air plate type heat exchanger, a high-temperature combustion air pipeline, a high-temperature flue gas supply device, a hot blast stove flue header pipe, a flue gas mixing chamber, a first flue pipe, a second flue pipe, a third flue pipe, a fourth flue pipe and a chimney;
the low-temperature gas pipeline is communicated with a gas inlet end of the gas pipe type heat exchanger, and the high-temperature gas pipeline is communicated with a gas outlet end of the gas pipe type heat exchanger;
the normal-temperature combustion-supporting air pipeline is communicated with an air inlet end of the air plate type heat exchanger, and the high-temperature combustion-supporting air pipeline is communicated with an air outlet end of the air plate type heat exchanger;
the gas inlet end of the high-temperature flue gas supply device is communicated with the low-temperature gas pipeline, and the gas outlet end of the high-temperature flue gas supply device is communicated with the first gas inlet end of the flue gas mixing chamber;
the main flue pipe of the hot blast stove is communicated with the second air inlet end of the flue gas mixing chamber;
the gas inlet end of the first flue pipe is communicated with the gas outlet end of the flue gas mixing chamber, and the gas outlet end of the first flue pipe is communicated with the flue gas inlet end of the gas pipe type heat exchanger;
the gas inlet end of the second flue pipe is communicated with the gas outlet end of the gas pipe type heat exchanger, and the gas outlet end of the second flue pipe is communicated with the chimney;
the air inlet end of the third flue pipe is communicated with the air outlet end of the flue gas mixing chamber, and the air outlet end of the third flue pipe is communicated with the flue gas inlet end of the air plate type heat exchanger;
and the air inlet end of the fourth flue pipe is communicated with the flue gas outlet end of the air plate type heat exchanger, and the air outlet end of the fourth flue pipe is communicated with the chimney.
2. The hot blast stove high temperature preheating system of claim 1, characterized in that:
a first flue adjusting cut-off valve is arranged on the first flue pipe;
a second flue adjusting cut-off valve is arranged on the third flue pipe;
the low-temperature gas pipeline is provided with a first cut-off valve;
a second cut-off valve is arranged on the high-temperature gas pipeline;
a third cut-off valve is arranged on the normal-temperature combustion air pipeline;
a fourth cut-off valve is arranged on the high-temperature combustion air pipeline;
a first flue valve is arranged on the second flue pipe;
and a second flue valve is arranged on the fourth flue pipe.
3. The hot blast stove high temperature preheating system of claim 1, wherein the high temperature flue gas supply device comprises: the device comprises a combustion furnace gas pipeline, a combustion furnace, a combustion-supporting air pipeline of the combustion furnace and a high-temperature flue pipe;
the gas inlet end of the combustion furnace gas pipeline is communicated with the low-temperature gas pipeline, and the gas outlet end of the combustion furnace gas pipeline is communicated with the first gas inlet end of the combustion furnace;
the air outlet end of the combustion air pipeline of the combustion furnace is communicated with the second air inlet end of the combustion furnace;
and the air outlet end of the high-temperature flue pipe is communicated with the second air inlet end of the flue gas mixing chamber.
4. The hot blast stove high temperature preheating system of claim 3, characterized in that:
and the air outlet end of the high-temperature flue pipe is communicated with the bottom of the flue gas mixing chamber.
5. The hot blast stove high temperature preheating system of claim 3, characterized in that:
the combustion furnace gas pipeline is provided with a combustion furnace gas regulating valve, a fifth stop valve and a combustion gas combustion valve, the fifth stop valve is arranged between the combustion furnace gas regulating valve and the combustion gas combustion valve, and the combustion gas combustion valve is arranged between the fifth stop valve and the first gas inlet end of the combustion furnace;
and the combustion-supporting air pipeline of the combustion furnace is provided with a combustion-supporting air regulating valve of the combustion furnace and a combustion-supporting air combustion valve of the combustion furnace, and the combustion-supporting air combustion valve of the combustion furnace is arranged between the combustion-supporting air regulating valve of the combustion furnace and the second air inlet end of the combustion furnace.
6. The hot blast stove high temperature preheating system of claim 3, wherein the high temperature flue gas supply device further comprises: a combustion fan of the combustion furnace;
and the air outlet end of the combustion-supporting fan of the combustion furnace is communicated with the air inlet end of the combustion-supporting air pipeline of the combustion furnace.
7. The hot blast stove high temperature preheating system of claim 1, characterized in that:
the main flue pipe of the hot blast stove and the flue gas mixing chamber are coaxially arranged.
8. The hot blast stove high temperature preheating system of claim 1, characterized in that:
and a spoiler is arranged in the smoke mixing chamber.
9. The hot blast stove high temperature preheating system of claim 1, further comprising: the first communicating pipeline, the second communicating pipeline and the third communicating pipeline;
the gas inlet end of the first communicating pipeline is communicated with the low-temperature gas pipeline, and the gas outlet end of the first communicating pipeline is communicated with the high-temperature gas pipeline;
the air inlet end of the second communicating pipeline is communicated with the normal-temperature combustion air pipeline, and the air outlet end of the second communicating pipeline is communicated with the high-temperature combustion air pipeline;
the air inlet end of the third communicating pipeline is communicated with the air outlet end of the flue gas mixing chamber, and the air outlet end of the third communicating pipeline is communicated with the chimney;
the first communicating pipeline is provided with a sixth cut-off valve, the second communicating pipeline is provided with a seventh cut-off valve, and the third communicating pipeline is provided with an eighth cut-off valve.
10. The hot blast stove high-temperature preheating method is based on the hot blast stove high-temperature preheating system of any one of claims 1 to 9, and is characterized by comprising the following steps of:
part of the coal gas pipe network enters a high-temperature flue gas supply device, and part of the coal gas is combusted in the high-temperature flue gas supply device to generate high-temperature flue gas which is conveyed to a flue gas mixing chamber;
the flue main pipe of the hot blast stove conveys the flue gas of the hot blast stove generated by the hot blast stove to the flue gas mixing chamber;
after the high-temperature flue gas and the flue gas of the hot blast stove are mixed in the flue gas mixing chamber, the mixed flue gas is conveyed to the gas pipe type heat exchanger through a first flue pipe and is conveyed to the air plate type heat exchanger through a third flue pipe;
the low-temperature gas pipeline conveys the gas of the other part of the gas pipe network to the gas pipe type heat exchanger, the gas of the other part and the high-temperature flue gas exchange heat in the gas pipe type heat exchanger, the other part of the gas after heat exchange is conveyed to the hot blast stove through the high-temperature gas pipeline, and the high-temperature flue gas after heat exchange is conveyed to the chimney through the second flue;
the normal-temperature combustion-supporting air pipeline conveys combustion-supporting air to the air plate heat exchanger, the air and the high-temperature flue gas exchange heat in the air plate heat exchanger, the air after heat exchange is conveyed to the hot blast stove through the high-temperature combustion-supporting air pipeline, and the high-temperature flue gas after heat exchange is conveyed to the chimney through the fourth flue.
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| CN202010080744.4A CN111118245B (en) | 2020-02-05 | 2020-02-05 | High-temperature preheating system and method for hot blast stove |
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| CN202010080744.4A CN111118245B (en) | 2020-02-05 | 2020-02-05 | High-temperature preheating system and method for hot blast stove |
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| CN111118245B CN111118245B (en) | 2023-11-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112460593A (en) * | 2020-11-25 | 2021-03-09 | 湖南华菱涟源钢铁有限公司 | Gas system of heating cover of cover type furnace and operation method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1336981A (en) * | 1962-10-08 | 1963-09-06 | Koppers Gmbh Heinrich | Method of operating gas or wind heater installations |
| CN2278917Y (en) * | 1996-04-05 | 1998-04-15 | 鞍山钢铁公司 | Preheating device with additional combustion furnace for hot-blast stove |
| CN2579906Y (en) * | 2002-10-10 | 2003-10-15 | 鞍山亨通阀门有限公司 | Gas and air double preheating device of mixing burning furnace high temperature smoke and hot-blast furnace low temperature smoke |
| CN101928796A (en) * | 2010-07-29 | 2010-12-29 | 江苏中天能源设备有限公司 | High wind temperature energy saving and emission reduction combined preheating method for blast furnace |
| CN102620424A (en) * | 2012-04-10 | 2012-08-01 | 河南省豫兴热风炉工程技术有限公司 | Top combustion stove with layered high and low temperature flue dual-preheating system |
| CN103320561A (en) * | 2013-06-08 | 2013-09-25 | 中冶南方工程技术有限公司 | Hot-blast stove system for high air temperature by using pure blast furnace gas and method thereof |
| CN211814546U (en) * | 2020-02-05 | 2020-10-30 | 北京首钢国际工程技术有限公司 | High-temperature preheating system of hot blast stove |
-
2020
- 2020-02-05 CN CN202010080744.4A patent/CN111118245B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1336981A (en) * | 1962-10-08 | 1963-09-06 | Koppers Gmbh Heinrich | Method of operating gas or wind heater installations |
| CN2278917Y (en) * | 1996-04-05 | 1998-04-15 | 鞍山钢铁公司 | Preheating device with additional combustion furnace for hot-blast stove |
| CN2579906Y (en) * | 2002-10-10 | 2003-10-15 | 鞍山亨通阀门有限公司 | Gas and air double preheating device of mixing burning furnace high temperature smoke and hot-blast furnace low temperature smoke |
| CN101928796A (en) * | 2010-07-29 | 2010-12-29 | 江苏中天能源设备有限公司 | High wind temperature energy saving and emission reduction combined preheating method for blast furnace |
| CN102620424A (en) * | 2012-04-10 | 2012-08-01 | 河南省豫兴热风炉工程技术有限公司 | Top combustion stove with layered high and low temperature flue dual-preheating system |
| CN103320561A (en) * | 2013-06-08 | 2013-09-25 | 中冶南方工程技术有限公司 | Hot-blast stove system for high air temperature by using pure blast furnace gas and method thereof |
| CN211814546U (en) * | 2020-02-05 | 2020-10-30 | 北京首钢国际工程技术有限公司 | High-temperature preheating system of hot blast stove |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112460593A (en) * | 2020-11-25 | 2021-03-09 | 湖南华菱涟源钢铁有限公司 | Gas system of heating cover of cover type furnace and operation method thereof |
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| CN111118245B (en) | 2023-11-03 |
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