CN111118245B - 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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- CN111118245B CN111118245B CN202010080744.4A CN202010080744A CN111118245B CN 111118245 B CN111118245 B CN 111118245B CN 202010080744 A CN202010080744 A CN 202010080744A CN 111118245 B CN111118245 B CN 111118245B
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000007789 gas Substances 0.000 claims abstract description 218
- 238000002485 combustion reaction Methods 0.000 claims abstract description 192
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 187
- 239000003546 flue gas Substances 0.000 claims abstract description 187
- 238000004891 communication Methods 0.000 claims description 39
- 230000001105 regulatory effect Effects 0.000 claims description 28
- 239000000567 combustion gas Substances 0.000 claims 3
- 239000000779 smoke Substances 0.000 description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 239000003034 coal gas Substances 0.000 description 6
- 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
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 239000003245 coal Substances 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
- 238000010248 power generation Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Classifications
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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
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- Organic Chemistry (AREA)
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Abstract
The application discloses a high-temperature preheating system and a high-temperature preheating method for a hot blast stove, and belongs to the technical field of blast furnace ironmaking. The hot blast stove high temperature preheating system includes: the low-temperature gas pipeline is communicated with the gas inlet end of the gas pipe heat exchanger, and the high-temperature gas pipeline is communicated with the gas outlet end of the gas pipe heat exchanger; the normal temperature combustion air pipeline is communicated with the air inlet end of the air plate type heat exchanger, and the high temperature combustion air pipeline is communicated with the air outlet end of the air plate type heat exchanger; the air inlet end of the high-temperature flue gas supply device is communicated with the low-temperature gas pipeline, and 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; and the flue header 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 method for the hot blast stove can realize high wind temperature, and have the advantages of simple flow, safety, reliability, low investment, low operation cost and long service life.
Description
Technical Field
The application relates to the technical field of blast furnace ironmaking, in particular to a high-temperature preheating system and a method for a hot blast stove.
Background
Nowadays, through several generations of efforts, the blast furnace ironmaking process has clarified the development direction, and the high wind temperature is also more and more important as an important principle. The hot air temperature is improved, so that the coal injection quantity can be improved, the coke ratio can be reduced, the coke resources can be saved, and the method has certain promotion effects in the aspects of strengthening blast furnace smelting, improving the molten iron yield, reducing environmental pollution and the like. The blast furnace gas in the iron and steel combined enterprises is directly combusted in the hot blast furnace system for improving the wind temperature, which is the most efficient use method which can be found at present, and the power generation efficiency is improved by 30-40% compared with the blast furnace gas in the iron and steel combined enterprises.
In the previous years, in order to raise the temperature of hot air, a simpler mode is often adopted, namely, a certain amount of high-heat-value gas such as coke oven gas, converter gas and the like is mixed and burned in blast furnace gas; with the technical development of the metallurgical industry, the high-heat-value gas of each steel plant is more and more intense, and even some steel plants do not have available high-heat-value gas, which forces people to start using single low-heat-value blast furnace gas, and a high-temperature preheating system is added to realize high wind temperature (1250 ℃ and above).
Through many years of technical development, a high-temperature preheating system has formed a plurality of modes, which are respectively: (1) adding a mixing furnace into the high-temperature air preheating furnace; (2) 4 hot blast stoves, 2 burning, 1 air supply and 1 preheating; (3) the high-temperature flue gas pipeline of the hot blast stove is provided with a heat exchanger; (4) the burner is combined with a heat exchanger. The heat exchangers are of the plate type and the tube type. However, the four modes have the problems of potential safety hazard, high investment, high running cost and short service life in use.
Disclosure of Invention
The application provides a high-temperature preheating system and a high-temperature preheating method for a hot blast stove, which solve or partially solve the technical problems of potential safety hazard, high investment, high operation cost and short service life of the high-temperature preheating system in the prior art.
In order to solve the technical problems, the application provides a hot blast stove high-temperature preheating system, which comprises: a low-temperature gas pipeline, a gas pipe heat exchanger, a high-temperature gas pipeline, a normal-temperature combustion air pipeline, an air plate heat exchanger, a high-temperature combustion air pipeline, a high-temperature flue gas supply device, a hot blast stove flue main 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 heat exchanger, and the high-temperature gas pipeline is communicated with a gas outlet end of the gas pipe heat exchanger; the normal-temperature combustion air pipeline is communicated with the air inlet end of the air plate type heat exchanger, and the high-temperature combustion air pipeline is communicated with the air outlet end of the air plate type heat exchanger; the air inlet end of the high-temperature flue gas supply device is communicated with the low-temperature gas pipeline, and 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 hot blast stove flue header pipe 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; 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 regulating and cutting valve is arranged on the first flue pipe; a second flue regulating and cutting valve is arranged on the third flue pipe; a first cut-off valve is arranged on the low-temperature gas pipeline; the high-temperature gas pipeline is provided with a second cut-off valve; 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; the second flue pipe is provided with a first flue valve; and a second flue valve is arranged on the fourth flue pipe.
Further, the high temperature flue gas supply device includes: a burner gas conduit, a burner combustion air conduit and a high temperature flue pipe; the air inlet end of the combustion furnace gas pipeline is communicated with the low-temperature gas pipeline, and the air outlet end of the combustion furnace gas pipeline is communicated with the first air 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; the air inlet end of the high-temperature flue pipe is communicated with the air outlet 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.
Further, 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 air inlet end of the combustion furnace; the combustion air pipeline of the combustion furnace is provided with a combustion air regulating valve of the combustion furnace and a combustion air combustion valve of the combustion furnace, and the combustion air combustion valve of the combustion furnace is arranged between the combustion 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 includes: a combustion-supporting fan of the combustion furnace; 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.
Further, the hot blast stove flue header pipe and the flue gas mixing chamber are arranged in a concentric shaft mode.
Further, a spoiler is arranged in the flue gas mixing chamber.
Further, the hot blast stove high temperature preheating system further comprises: the first communication pipeline, the second communication pipeline and the third communication pipeline; the air inlet end of the first communication pipeline is communicated with the low-temperature gas pipeline, and the air outlet end of the first communication pipeline is communicated with the high-temperature gas pipeline; the air inlet end of the second communication pipeline is communicated with the normal-temperature combustion air pipeline, and the air outlet end of the second communication pipeline is communicated with the high-temperature combustion air pipeline; the air inlet end of the third communication pipeline is communicated with the air outlet end of the flue gas mixing chamber, and the air outlet end of the third communication pipeline is communicated with the chimney; the first communication pipeline is provided with a sixth cut-off valve, the second communication pipeline is provided with a seventh cut-off valve, and the third communication pipeline is provided with an eighth cut-off valve.
Based on the same inventive concept, the application also provides a hot blast stove high temperature preheating method, which comprises the following steps: part of the gas pipe network enters a high-temperature flue gas supply device, part of the gas is burnt in the high-temperature flue gas supply device to generate high-temperature flue gas, and the high-temperature flue gas is conveyed to a flue gas mixing chamber; the hot blast stove flue main pipe conveys hot blast stove flue gas generated by the hot blast stove to the flue gas mixing chamber; the high-temperature flue gas and the hot blast stove flue gas are mixed in a flue gas mixing chamber, and then are conveyed to the gas tube type heat exchanger through a first flue pipe and are 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 heat exchanger, the gas of the other part and the high-temperature flue gas exchange heat in the gas pipe 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 air pipeline conveys combustion air to the air plate type heat exchanger, air and high temperature flue gas exchange heat in the air plate type heat exchanger, the air after heat exchange is conveyed to the hot blast stove through the high temperature combustion 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 at least have the following technical effects or advantages:
because the low-temperature gas pipeline is communicated with the gas inlet end of the gas pipe heat exchanger, the high-temperature gas pipeline is communicated with the gas outlet end of the gas pipe heat exchanger, the normal-temperature combustion air pipeline is communicated with the air inlet end of the air plate heat exchanger, and the high-temperature combustion air pipeline is communicated with the air outlet end of the air plate heat exchanger, so that the low-temperature gas pipeline is externally connected with a gas pipe network to convey most of the gas pipe network to the gas pipe heat exchanger, the normal-temperature combustion air pipeline conveys the external combustion air to the air plate heat exchanger, a combined preheating mode of the gas pipe heat exchanger and the air plate heat exchanger is adopted, the gas pipe heat exchanger is corrosion-resistant, the safety coefficient is high, the platform arrangement is less, the smoke resistance is small, the air plate heat exchanger is adopted, the occupied space is small, the heat exchange efficiency is high, a combined mode of the two is adopted, a mixing chamber is arranged on a flue main pipe, the high-temperature flue gas induced draft fan is not needed to be arranged to create powerful conditions, because 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 hot blast stove flue main pipe is communicated with the second air inlet end of the flue gas mixing chamber, so that the other part of coal gas of the coal gas pipeline network enters the high-temperature flue gas supply device through the low-temperature gas pipeline, the other part of coal 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 hot blast stove flue main pipe conveys the hot blast stove flue gas generated by the hot blast stove to the flue gas mixing chamber, the high-temperature flue gas and the hot blast stove flue gas are mixed in the flue gas mixing chamber, the flue main pipe of the hot blast stove is not needed to be additionally provided with the high-temperature flue gas induced draft fan, the power consumption is saved, the occupied space is saved, the pipeline arrangement is more compact, 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 air inlet end of the gas pipe heat exchanger, the air inlet end of the second flue pipe is communicated with the flue gas air outlet end of the gas pipe heat exchanger, the air outlet 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 air inlet end of the air plate heat exchanger, the air outlet end of the fourth flue pipe is communicated with the chimney, so that the mixed high-temperature flue gas and hot blast stove flue gas are conveyed to the gas pipe heat exchanger through the first flue pipe, the high-temperature flue gas exchanges heat with a part of the gas in the gas pipe heat exchanger through the third flue pipe, a part of the gas after heat exchange is conveyed to the high-temperature gas pipe heat exchanger through the high-temperature gas pipe, the high-temperature flue gas after heat exchange is conveyed to the chimney through the high-temperature gas pipe heat exchanger, the high-temperature flue gas after heat exchange is conveyed to the chimney through the high-temperature pipe heat exchange pipeline, the high-temperature flue gas and the flue gas can be conveyed to the low-temperature flue gas through the air heat exchanger through the low-temperature flue pipe heat exchange pipeline, and the high-temperature flue gas can be easily and has a long service life through the air flue, and the high-temperature flue gas can be easily and has a long investment cost, and can be realized, and the flue can be safely run after the flue and has a long service life.
Drawings
FIG. 1 is a schematic diagram of a high-temperature preheating system of a hot blast stove according to an embodiment of the present application;
FIG. 2 is a schematic diagram of the flue gas mixing chamber in the hot air furnace high temperature preheating system of FIG. 1;
fig. 3 is a schematic view of the installation of a spoiler in the flue gas mixing chamber of fig. 2.
Detailed Description
Referring to fig. 1, a hot blast stove high temperature preheating system provided by an embodiment of the present application includes: the low-temperature gas pipeline 1, the gas pipe type heat exchanger 2, the high-temperature gas pipeline 3, the normal-temperature combustion air pipeline 4, the air plate type heat exchanger 5, the high-temperature combustion air pipeline 6, the high-temperature flue gas supply device 7, the hot blast stove flue main pipe 8, the flue gas mixing chamber 9, the first flue pipe 10, the second flue pipe 11, the third flue pipe 12, the fourth flue pipe 13 and the chimney 14.
The low-temperature gas pipeline 1 is communicated with the gas inlet end of the gas pipe heat exchanger 2, and the high-temperature gas pipeline 3 is communicated with the gas outlet end of the gas pipe heat exchanger 2.
The normal temperature combustion air pipeline 4 is communicated with the air inlet end of the air plate type heat exchanger 5, and the high temperature combustion air pipeline 6 is communicated with the 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 hot blast stove flue header pipe 8 is communicated with a 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 tube type heat exchanger 2.
The air inlet end of the second flue pipe 11 is communicated with the flue gas outlet end of the gas pipe type heat exchanger 2, and 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, and the air outlet end of the third flue pipe 12 is communicated with the flue gas inlet end of the air plate 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 heat exchanger 5, and the air outlet end of the fourth flue pipe 13 is communicated with the chimney 14.
In the specific embodiment of the application, the low-temperature gas pipeline 1 is communicated with the gas inlet end of the gas tube heat exchanger 2, the high-temperature gas pipeline 3 is communicated with the gas outlet end of the gas tube heat exchanger 2, the normal-temperature combustion air pipeline 4 is communicated with the air inlet end of the air plate heat exchanger 5, and the high-temperature combustion air pipeline 6 is communicated with the air outlet end of the air plate heat exchanger 5, so that the low-temperature gas pipeline 1 is externally connected with the gas tube network 15, most of the gas tube network 15 is conveyed to the gas tube heat exchanger 2, the normal-temperature combustion air pipeline 4 conveys the external combustion air to the air plate heat exchanger 5, the gas tube heat exchanger 2 and the air plate heat exchanger 5 are combined to be in a preheating mode, the gas tube heat exchanger 2 is corrosion-resistant, the safety coefficient is high, the platform arrangement is less, the smoke resistance is small, the air plate heat exchanger 5 is adopted, the occupied space is small, the heat exchange efficiency is high, a combination mode of the two is used, a powerful condition is created for arranging the mixing chamber on the hot blast stove flue header pipe 8, a high-temperature smoke induced draft fan is not needed to be arranged, as the air inlet end of the high-temperature smoke supply device 7 is communicated with the low-temperature gas pipeline 1, the air outlet end of the high-temperature smoke supply device 7 is communicated with the first air inlet end of the smoke mixing chamber 9, the hot blast stove flue header pipe 8 is communicated with the second air inlet end of the smoke mixing chamber 9, so that the other part of coal gas of the coal gas pipe network 15 enters the high-temperature smoke supply device 7 through the low-temperature gas pipeline 1, the other part of coal gas is burnt in the high-temperature smoke supply device 7 to generate high-temperature smoke which is conveyed to the smoke mixing chamber 9, the hot blast stove flue header pipe 8 conveys the smoke generated by the hot blast stove to the smoke mixing chamber 9, the high-temperature smoke and the smoke are mixed in the smoke mixing chamber 9, the flue gas mixing chamber 9 is arranged on the flue header pipe 8 of the hot blast stove, a high-temperature flue gas induced draft fan is not required to be additionally arranged, the power consumption is saved, the occupied space is saved, the pipeline arrangement is more compact, the material consumption and the operation cost are also saved, because the air inlet end of the first flue pipe 10 is communicated with the air outlet end of the flue gas mixing chamber 9, 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 air inlet 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 inlet 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, the air outlet end of the fourth flue pipe 13 is communicated with the chimney 14, so that the mixed high-temperature flue gas and the hot blast stove flue gas are conveyed to the gas pipe type 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 high-temperature flue gas exchanges heat with part of the gas in the gas pipe type heat exchanger 2, part of the gas after heat exchange is conveyed to the hot blast stove through the high-temperature 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 air in the air plate type heat exchanger 5, the air after heat exchange is conveyed to the hot blast stove through the high-temperature combustion air pipeline 6, and the high-temperature flue gas after heat exchange is conveyed to the chimney through the fourth flue pipe 13, so that the high-temperature hot blast stove can be realized, the flow is simple, the investment is low, the operation cost is low, and the service life is long.
Specifically, the heat exchange tubes of the gas tube type heat exchanger 2 are vertically arranged, the double boxes are arranged in parallel and are used in series, the gas passes through the shell pass, the gas passes through the tube pass, the gas tube type heat exchanger is corrosion-resistant, the safety coefficient is high, the platform arrangement is few, and the gas resistance loss is small. The air preheating device adopts the air plate type heat exchanger 5, occupies small space, has high heat exchange efficiency, and creates powerful conditions for arranging the flue gas mixing chamber on the flue header pipe of the hot blast stove without arranging a high-temperature flue gas induced draft fan by using a combined mode of the air plate type heat exchanger and the air plate type heat exchanger.
Specifically, the first flue pipe 10 is provided with a first flue regulating and cutting valve 16, and the flue gas amount of the high-temperature flue gas entering the gas pipe type heat exchanger 2 can be controlled by regulating the opening of the first flue regulating and cutting valve 16, so that the temperature of the preheated gas is controlled.
The third flue pipe 12 is provided with a second flue regulating and cutting valve 17, and the flue gas amount of the high-temperature flue gas entering the air plate heat exchanger 5 can be controlled by regulating the opening of the second flue regulating and cutting valve 17, so that the temperature of the preheated combustion 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 the gas and the combustion air are preheated, the first shut-off valve 18, the second shut-off valve 19, the third shut-off valve 20, the fourth shut-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 shut-off valve 18, the second shut-off valve 19, the third shut-off valve 20, the fourth shut-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 furnace combustion air pipeline 7-3 and a high temperature flue pipe 7-4.
The air inlet end of the combustion furnace gas pipeline 7-1 is communicated with the low-temperature gas pipeline 1, and the air outlet end of the combustion furnace gas pipeline 7-1 is communicated with the first air inlet end of the combustion furnace 7-2.
The outlet end of the combustion air pipeline 7-3 of the combustion furnace is communicated with the second 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 of the low-temperature gas pipeline 1 to the combustion furnace 7-2, combustion air of the combustion furnace enters the combustion furnace 7-2 through the combustion air pipeline 7-3 of the combustion furnace, so that the gas and the combustion 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 enters the flue gas mixing chamber 9, and the high-temperature flue gas is convenient to mix with hot blast stove flue gas generated by the hot blast stove. In this embodiment, the air outlet end of the high temperature flue pipe 7-4 may be connected to 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 cut-off valve 7-6 and a combustion furnace gas combustion valve 7-7, the fifth cut-off 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 cut-off valve 7-6 and the first air inlet end of the combustion furnace 7-2.
The combustion air pipeline 7-3 is provided with a combustion air regulating valve 7-8 and a combustion air combustion valve 7-9, and the combustion air combustion valve 7-9 is arranged between the combustion air regulating valve 7-8 and the second air inlet end of the combustion furnace 7-2.
The gas flow rate 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 rate entering the combustion furnace 7-2 can be controlled by adjusting the combustion furnace combustion air adjusting valve 7-8, so that the flue gas amount and the flue gas temperature generated by the combustion furnace 7-2 are controlled.
The combustion furnace gas combustion valve 7-7 and the combustion furnace combustion air combustion valve 7-9 facilitate gas combustion.
When the gas and the combustion air are preheated, the fifth shut-off valve 7-6 is in an open state, and when the equipment is to be overhauled, the fifth shut-off valve 7-6 is in a closed state.
The temperature mode of three-valve or four-valve linkage regulation is adopted, namely, the air flow and the gas flow of the combustion furnace are regulated through a gas regulating valve 7-5 of the combustion furnace and a combustion air regulating valve 7-8 of the combustion furnace, the flue gas quantity and the flue gas temperature generated by the combustion furnace 7-2 are controlled, meanwhile, a first flue regulating cut-off valve 16 is arranged on a first flue pipe 10 or a second flue regulating cut-off valve 17 is arranged on a third flue pipe 12, and the flue gas quantity flowing into the air plate heat exchanger 5 and the gas pipe heat exchanger 2 is regulated within a certain range through the valve, so that the temperature after the air and the gas are preheated is controlled.
The high temperature flue gas supply device further includes: 7-10 parts of combustion-supporting fans of the 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.
The 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 the combustion-supporting air pipeline 7-3 of the combustion furnace.
Referring to fig. 2-3, specifically, the hot blast stove flue header pipe 8 and the flue gas mixing chamber 9 are coaxially arranged, so that hot blast stove flue gas conveyed by the hot blast stove flue header pipe 8 enters the flue gas mixing chamber 9.
The flue gas mixing chamber 9 is internally provided with a spoiler 24, and high-temperature flue gas generated by the combustion furnace 7-2 and hot blast stove flue gas conveyed by the hot blast stove flue header pipe 8 are fully mixed in a short distance through the spoiler 24.
Specifically, the hot blast stove high temperature preheating system further comprises: a first communication pipe 25, a second communication pipe 26 and a third communication pipe 27.
The air inlet end of the first communication pipeline 25 is communicated with the low-temperature gas pipeline 1, and the air outlet end of the first communication pipeline 25 is communicated with the high-temperature gas pipeline 3.
The air inlet end of the second communication pipeline 26 is communicated with the normal-temperature combustion air pipeline 4, and the air outlet end of the second communication pipeline 26 is communicated with the high-temperature combustion air pipeline 6.
The air inlet end of the third communication pipeline 27 is communicated with the air outlet end of the flue gas mixing chamber 9, and the air outlet end of the third communication pipeline 27 is communicated with the chimney 14.
Wherein, the sixth shut-off valve 28 is arranged on the first communication pipeline 25, the seventh shut-off valve 29 is arranged on the second communication pipeline 26, and the eighth shut-off valve 30 is arranged on the third communication pipeline 27.
When the gas and the combustion air are preheated, the sixth cut-off valve 28, the seventh cut-off valve 29 and the eighth cut-off valve 30 are in the closed state, when the equipment is to be overhauled, the sixth cut-off valve 28, the seventh cut-off valve 29 and the eighth cut-off valve 30 are in the open state, the gas sequentially enters the hot blast stove through the low-temperature gas pipeline 1, the first communication pipeline 25 and the high-temperature gas pipeline 3, the combustion air sequentially enters the hot blast stove through the normal-temperature combustion air pipeline 4, the second communication pipeline 26 and the high-temperature combustion air pipeline, the high-temperature flue gas sequentially enters the chimney 14 through the flue gas mixing chamber 9 and the third communication pipeline 27, the normal operation of the hot blast stove is ensured, and the safety of the equipment is ensured.
Based on the same inventive concept, the application also provides a hot blast stove high temperature preheating method, which comprises the following steps:
in the step 1, part of the gas pipe network 15 enters the high-temperature flue gas supply device 7, part of the gas is burnt in the high-temperature flue gas supply device 7 to generate high-temperature flue gas, and the high-temperature flue gas is conveyed to the flue gas mixing chamber 9.
And 2, conveying hot blast stove flue gas generated by the hot blast stove to a flue gas mixing chamber 9 by a hot blast stove flue header pipe 8.
And 3, mixing the high-temperature flue gas and the hot blast stove flue gas in a flue gas mixing chamber 9, conveying the mixed flue gas to the gas tube 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 gas of the other part of the gas pipe network 15 to the gas pipe heat exchanger 2 by the low-temperature gas pipe 1, exchanging heat between the gas of the other part and the high-temperature flue gas in the gas pipe heat exchanger 5, conveying the exchanged gas of the other part to the hot blast stove by the high-temperature gas pipe 3, and conveying the exchanged high-temperature flue gas to the chimney 14 by the second flue 11.
And 5, conveying combustion air to an air plate type heat exchanger 5 by a normal-temperature combustion air pipeline 4, exchanging heat between air and high-temperature flue gas in the air plate type heat exchanger 5, conveying the heat exchanged air to a hot blast stove by a high-temperature combustion air pipeline 6, and conveying the heat exchanged high-temperature flue gas to a chimney 14 by a fourth flue 13.
In order to more clearly describe the embodiments of the present application, the following description is made on the method of using the embodiments of the present application.
The combustion furnace gas pipeline 7-1 conveys part of the gas of the low-temperature gas pipeline 1 to the combustion furnace 7-2, combustion air of the combustion furnace enters the combustion furnace 7-2 through the combustion air pipeline 7-3 of the combustion furnace, so that the gas and the combustion 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 hot blast stove flue header pipe 8 conveys hot blast stove flue gas generated by the hot blast stove to the flue gas mixing chamber 9. The high-temperature flue gas and the hot blast stove flue gas are mixed in a flue gas mixing chamber 9, and then are conveyed to the gas tube type heat exchanger 2 through a first flue pipe 10 and are conveyed to the air plate type heat exchanger 5 through a third flue pipe 12.
The low-temperature gas pipeline 1 conveys the gas of the other part of the gas pipeline 15 to the gas pipe type heat exchanger 2, the gas of the other part exchanges heat with the high-temperature flue gas in the gas pipe 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 air pipeline 4 conveys combustion air to the air plate heat exchanger 5, 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 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-mentioned embodiments are only for illustrating the technical solution of the present application, and not for limiting the same, and although the present application has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present application without departing from the spirit and scope of the technical solution of the present application, and all such modifications and equivalents are intended to be encompassed in the scope of the claims of the present application.
Claims (7)
1. A hot blast stove high temperature preheating system, comprising: a low-temperature gas pipeline, a gas pipe heat exchanger, a high-temperature gas pipeline, a normal-temperature combustion air pipeline, an air plate heat exchanger, a high-temperature combustion air pipeline, a high-temperature flue gas supply device, a hot blast stove flue main 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 heat exchanger, and the high-temperature gas pipeline is communicated with a gas outlet end of the gas pipe heat exchanger;
the normal-temperature combustion air pipeline is communicated with the air inlet end of the air plate type heat exchanger, and the high-temperature combustion air pipeline is communicated with the air outlet end of the air plate type heat exchanger;
the air inlet end of the high-temperature flue gas supply device is communicated with the low-temperature gas pipeline, and 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 hot blast stove flue header pipe 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;
the air inlet end of the fourth flue pipe is communicated with the flue gas outlet end of the air plate heat exchanger, and the air outlet end of the fourth flue pipe is communicated with the chimney;
a first flue regulating and cutting valve is arranged on the first flue pipe;
a second flue regulating and cutting valve is arranged on the third flue pipe;
a first cut-off valve is arranged on the low-temperature gas pipeline;
the high-temperature gas pipeline is provided with a second cut-off valve;
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;
the second flue pipe is provided with a first flue valve;
a second flue valve is arranged on the fourth flue pipe;
the high-temperature flue gas supply device comprises: a burner gas conduit, a burner combustion air conduit and a high temperature flue pipe;
the air inlet end of the combustion furnace gas pipeline is communicated with the low-temperature gas pipeline, and the air outlet end of the combustion furnace gas pipeline is communicated with the first air 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;
the air inlet end of the high-temperature flue pipe is communicated with the air outlet 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;
the combustion furnace gas pipeline is provided with a combustion furnace gas regulating valve, a fifth cut-off valve and a combustion gas combustion valve, the fifth cut-off 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 cut-off valve and a first air inlet end of the combustion furnace;
the combustion air pipeline of the combustion furnace is provided with a combustion air regulating valve of the combustion furnace and a combustion air combustion valve of the combustion furnace, and the combustion air combustion valve of the combustion furnace is arranged between the combustion air regulating valve of the combustion furnace and the second air inlet end of the combustion furnace.
2. The hot blast stove high temperature preheating system according to claim 1, 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.
3. The hot blast stove high temperature preheating system according to claim 1, wherein the high temperature flue gas supply device further comprises: a combustion-supporting fan of the combustion furnace;
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.
4. The hot blast stove high temperature preheating system according to claim 1, characterized in that:
and the flue header pipe of the hot blast stove and the flue gas mixing chamber are arranged in a concentric shaft manner.
5. The hot blast stove high temperature preheating system according to claim 1, characterized in that:
and a spoiler is arranged in the flue gas mixing chamber.
6. The hot blast stove high temperature preheating system according to claim 1, further comprising: the first communication pipeline, the second communication pipeline and the third communication pipeline;
the air inlet end of the first communication pipeline is communicated with the low-temperature gas pipeline, and the air outlet end of the first communication pipeline is communicated with the high-temperature gas pipeline;
the air inlet end of the second communication pipeline is communicated with the normal-temperature combustion air pipeline, and the air outlet end of the second communication pipeline is communicated with the high-temperature combustion air pipeline;
the air inlet end of the third communication pipeline is communicated with the air outlet end of the flue gas mixing chamber, and the air outlet end of the third communication pipeline is communicated with the chimney;
the first communication pipeline is provided with a sixth cut-off valve, the second communication pipeline is provided with a seventh cut-off valve, and the third communication pipeline is provided with an eighth cut-off valve.
7. A hot blast stove high temperature preheating method based on the hot blast stove high temperature preheating system as claimed in any one of claims 1-6, characterized in that the hot blast stove high temperature preheating method comprises the steps of:
part of the gas pipe network enters a high-temperature flue gas supply device, part of the gas is burnt in the high-temperature flue gas supply device to generate high-temperature flue gas, and the high-temperature flue gas is conveyed to a flue gas mixing chamber;
the hot blast stove flue main pipe conveys hot blast stove flue gas generated by the hot blast stove to the flue gas mixing chamber;
the high-temperature flue gas and the hot blast stove flue gas are mixed in a flue gas mixing chamber, and then are conveyed to the gas tube type heat exchanger through a first flue pipe and are 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 heat exchanger, the gas of the other part and the high-temperature flue gas exchange heat in the gas pipe 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 air pipeline conveys combustion air to the air plate type heat exchanger, air and high temperature flue gas exchange heat in the air plate type heat exchanger, the air after heat exchange is conveyed to the hot blast stove through the high temperature combustion 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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| CN111118245B true CN111118245B (en) | 2023-11-03 |
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| 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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