CN210215414U - Blast furnace coal powder injection and hot blast stove air/coal gas series preheating system - Google Patents
Blast furnace coal powder injection and hot blast stove air/coal gas series preheating system Download PDFInfo
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- CN210215414U CN210215414U CN201920676782.9U CN201920676782U CN210215414U CN 210215414 U CN210215414 U CN 210215414U CN 201920676782 U CN201920676782 U CN 201920676782U CN 210215414 U CN210215414 U CN 210215414U
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Abstract
The utility model relates to a preheating system for the series connection of blast furnace coal powder injection and air/coal gas of a hot blast stove, which comprises the hot blast stove, a coal powder preheating system, an air/coal gas preheating system and a chimney; the pulverized coal preheating system comprises a combustion furnace and a pulverized coal preheater, and the air/coal gas preheating system comprises an air preheater and/or a coal gas preheater. The utility model discloses a set up the series connection and preheat the system, the high temperature flue gas of hot-blast furnace is used for preheating the buggy earlier, and the reuse is used for preheating air and/or coal gas to realize the hierarchical utilization of hot-blast furnace flue gas, can realize that the high temperature of buggy preheats, can realize again that the high temperature of air and/or coal gas preheats, waste heat in the flue gas can fully be retrieved finally, realize energy saving and consumption reduction's purpose.
Description
Technical Field
The utility model relates to a blast furnace hot blast stove flue gas waste heat comprehensive utilization technical field especially relates to a blast furnace jetting buggy and hot-blast furnace air/coal gas series connection system of preheating.
Background
The iron-making industry in the world generally has the problems of high energy consumption, high cost, coke shortage, production environment deterioration and the like, the energy consumption of iron-making becomes an important component in ton steel cost, and the emission of pollutants also has a serious influence on the environment. Therefore, energy conservation and environmental protection in iron making are very important for the healthy development of the whole steel industry.
The resource of the coal for coking is increasingly in shortage all over the world, and the global sense is that the resource of the coal for coking is in crisis. In China, although coal resources are rich, the resource condition of coking coal is not optimistic, and the tension of coking coal supply restricts the development of steel production in China. The increasing shortage of coking coal resources causes the coke to be expensive, and the coking process has serious environmental pollution, so how to reduce the coke ratio becomes the most concerned problem for blast furnace ironmaking workers. At present, the most economical and effective way to reduce the coke consumption is to inject a large amount of coal powder and replace the coke with coal to reduce the coke consumption. And the coal injection is beneficial to reducing the pig iron cost, adjusting the furnace condition and thermal system, improving the working state of the furnace hearth and creating conditions for improving the air temperature and oxygen-enriched blast of the blast furnace. Therefore, the coal powder injection is widely applied to blast furnace ironmaking production and achieves obvious effect.
With the increasing of the coal injection ratio of the blast furnace, the proportion of the coal powder in the whole fuel is higher and higher, and can reach 50 percent at most. However, practice proves that under the condition of high coal injection ratio, the phenomenon that unburned coal powder escapes from the furnace top often occurs, and the full utilization of the coal powder cannot be realized, so that the combustion rate of the coal powder in a tuyere is improved, and the problem of solving the utilization of the coal powder in a blast furnace is an important problem which must be faced in the large coal injection operation. In recent years, some steel and iron works at home and abroad are developing new technologies for preheating pulverized coal to improve the combustion condition of the pulverized coal at a tuyere. The influence of coal injection on the blast furnace is analyzed. The preheating and blowing of the pulverized coal are beneficial to reducing the cooling effect of the pulverized coal to hot air, accelerating the combustion process of the pulverized coal so as to improve the utilization rate of the pulverized coal and improve the combustion condition of the pulverized coal at a tuyere.
Meanwhile, the improvement of the air supply temperature of the hot blast stove and the realization of high blast temperature smelting of the blast furnace are also important ways for increasing yield, saving energy and reducing consumption. Practice proves that the coke ratio can be reduced by 3-4% and the yield can be increased by 2.5-4% when the air temperature is increased by 100 ℃, and the economic benefit is very obvious.
The Chinese patent application with publication number CN103993110A discloses a novel preheating process before pulverized coal injection for blast furnaces, wherein high-temperature flue gas generated by blast furnace hot blast furnaces is conveyed to a heating furnace for secondary heating through a flue gas induced draft fan and a flue gas pipeline. And (3) feeding the high-temperature flue gas after temperature rise into a pulverized coal preheater, heating the pulverized coal to 250-350 ℃, and feeding all the high-temperature flue gas after heat exchange into a coal mill to dry the pulverized coal. Due to multiple limitations of the heat-resistant temperature of the coal mill body, the safe operation temperature of the pulverized coal, the heat-resistant temperature of the subsequent pulverized coal collecting cloth bag and the like, the process cannot realize higher preheating temperature.
Chinese patent application publication No. CN102605119A discloses a pulverized coal conveying and preheating process apparatus in a pulverized coal injection process of a blast furnace, which preheats pulverized coal and does not reuse preheated high-temperature gas, thereby causing energy waste.
In a conventional pulverized coal preheating system, in order to ensure that pulverized coal is preheated to a high temperature (more than or equal to 300 ℃), the temperature of a flue gas inlet of a pulverized coal preheater needs to be increased, but the temperature of a flue gas outlet of the pulverized coal preheater is correspondingly higher, and if the heat of the flue gas cannot be well utilized, a large amount of heat can be wasted.
Disclosure of Invention
The utility model provides a blast furnace jetting buggy and hot-blast furnace air/coal gas series connection system of preheating preheats through setting up the series connection system of preheating, and the high temperature flue gas of hot-blast furnace is used for preheating the buggy earlier, and the reuse is used for preheating air and/or coal gas to realize the hierarchical utilization of hot-blast furnace flue gas, can realize that the high temperature of buggy preheats, can realize again that the high temperature of air and/or coal gas preheats, waste heat in the flue gas can fully be retrieved, realize energy saving and consumption reduction's purpose.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a blast furnace coal powder injection and hot blast stove air/coal gas series connection preheating system comprises a hot blast stove, a coal powder preheating system, an air/coal gas preheating system and a chimney; the pulverized coal preheating system comprises a combustion furnace and a pulverized coal preheater, and the air/coal gas preheating system comprises an air preheater and/or a coal gas preheater; the high-temperature flue gas outlet of the hot blast stove is connected with a flue gas main pipe through a flue gas branch pipe, the flue gas main pipe is respectively connected with a flue gas inlet of a combustion furnace, a heat exchange flue gas inlet of a pulverized coal preheater and a chimney through a flue gas conveying pipe, and the flue gas main pipe is simultaneously and respectively connected with a preheating flue gas inlet of an air preheater and/or a preheating flue gas inlet of a coal gas preheater through the flue gas conveying pipe; the heated flue gas outlet of the combustion furnace is connected with the heat exchange flue gas inlet of the pulverized coal preheater through a heating flue gas pipe; a heat exchange flue gas outlet of the pulverized coal preheater is connected with a preheating flue gas inlet of the air preheater and/or a preheating flue gas inlet of the coal gas preheater through a heat exchange flue gas pipe; the smoke outlet of the air preheater and/or the gas preheater is connected with the chimney through a smoke outlet pipe.
A valve is arranged on a flue gas main pipe at the downstream of the flue gas conveying pipe connected with the air preheater and/or the coal gas preheater; valves are respectively arranged on the flue gas conveying pipes connected with the combustion furnace, the pulverized coal preheater, the air preheater and the coal gas preheater; valves are respectively arranged on the heating flue gas pipe, the heat-exchanged flue gas pipe and the flue gas outlet pipe.
The coal gas preheater and the air preheater are plate heat exchangers or tubular heat exchangers.
Compared with the prior art, the beneficial effects of the utility model are that:
1) the utility model can realize the high temperature preheating of the coal powder and air and/or coal gas; the temperature range of the preheated coal powder is wide (the temperature can be preheated to 200-500 ℃); the temperature range of the preheated air/coal gas is also wide (the temperature can be preheated to 150-400 ℃);
2) after the system of the utility model is adopted, the preheating temperature of the coal powder can be higher, and the coal powder entering the blast furnace can bring more physical heat, which is beneficial to improving the coal powder combustion rate and the coal injection quantity;
3) in the traditional air and coal gas preheating technology, the preheating temperature of the air and the coal gas is usually lower than 200 ℃, the air and the coal gas in the utility model can be preheated to a higher temperature, the air temperature level of the hot blast stove can be obviously improved, and the energy saving and the consumption reduction of a blast furnace are facilitated;
4) the conventional preheating system considers that each blast furnace coal injection pipeline is only 1 or 2, the specific heat capacity of coal powder is far larger than that of air/coal gas, the pressure of the coal injection pipeline is far higher than that of the air/coal gas pipeline, and the turning radius of the coal injection pipeline has strict requirements, so that the heat exchange efficiency of a coal powder preheater is generally lower than that of an air/coal gas heat exchanger; the utility model discloses the advanced relatively lower buggy pre-heater of heat exchange efficiency of going into of well high temperature flue gas, export flue gas temperature is still higher, and the high temperature flue gas after the heat transfer is sent into the relatively higher air heater of heat exchange efficiency and/or coal gas pre-heater again, the low temperature flue gas of discharging after the heat transfer, the exhaust gas temperature scope is 150 ~ 250 ℃, and the flue gas heat utilization is more reasonable.
Drawings
Fig. 1 is a schematic structural diagram of a preheating system for serially connecting blast furnace pulverized coal injection and air/gas of a hot blast stove.
In the figure: 1. the system comprises a pulverized coal preheating system 11, a pulverized coal preheater 12, a combustion furnace 13, a pulverized coal conveying pipeline 14, a pulverized coal injection pipeline 2, an air/coal gas preheating system 21, a coal gas preheater 22, an air preheater 3, a hot blast stove 4, a flue gas branch pipe 5, a flue gas main pipe 6, a heating flue gas pipe 7, a heat exchange flue gas pipe 8, a flue gas outlet pipe 9, a chimney 10, a valve
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
as shown in fig. 1, the preheating system for the blast furnace injecting pulverized coal and the air/gas of the hot blast stove in series of the utility model comprises a hot blast stove 3, a pulverized coal preheating system 1, an air/gas preheating system 2 and a chimney 9; the pulverized coal preheating system 1 comprises a combustion furnace 12 and a pulverized coal preheater 11, and the air/coal gas preheating system 2 comprises an air preheater 22 and/or a coal gas preheater 21; a high-temperature flue gas outlet of the hot blast stove 3 is connected with a flue gas main pipe 5 through a flue gas branch pipe 4, the flue gas main pipe 5 is respectively connected with a flue gas inlet of a combustion furnace 12, a heat exchange flue gas inlet of a pulverized coal preheater 11 and a chimney 9 through flue gas conveying pipes, and the flue gas main pipe 5 is simultaneously and respectively connected with a preheating flue gas inlet of an air preheater 22 and/or a preheating flue gas inlet of a coal gas preheater 21 through the flue gas conveying pipes; a heated flue gas outlet of the combustion furnace 12 is connected with a heat exchange flue gas inlet of the pulverized coal preheater 11 through a heated flue gas pipe 6; the heat exchange flue gas outlet of the pulverized coal preheater 11 is connected with the preheating flue gas inlet of the air preheater 22 and/or the preheating flue gas inlet of the coal gas preheater 21 through the heat exchange flue gas pipe 7; the flue gas outlet of the air preheater 22 and/or the gas preheater 21 is connected to the chimney 9 via the flue gas outlet pipe 8.
A valve 10 is arranged on a flue gas main pipe 5 at the downstream of a flue gas conveying pipe connected with the air preheater 22 and/or the coal gas preheater 21; the smoke conveying pipes connected with the combustion furnace 12, the pulverized coal preheater 11, the air preheater 22 and the coal gas preheater 21 are respectively provided with a valve 10; valves 10 are respectively arranged on the heating flue gas pipe 6, the heat-exchanged flue gas pipe 7 and the flue gas outlet pipe 8.
The coal gas preheater 21 and the air preheater 22 are plate heat exchangers or tubular heat exchangers.
The working principle of the blast furnace injection pulverized coal and hot blast stove air/coal gas series preheating system is as follows: high-temperature flue gas of the hot blast stove 3 firstly enters the pulverized coal preheating system 1 for pulverized coal preheating, and the flue gas after heat exchange enters the air/coal gas preheating system 2 for air and/or coal gas preheating, so that the classified utilization of the waste heat of the high-temperature flue gas is realized.
The technical process of the blast furnace injection pulverized coal and hot blast stove air/coal gas series preheating system is as follows: high-temperature flue gas at 250-350 ℃ led out from the hot blast stove 3 is directly sent to a pulverized coal preheater 11, or the high-temperature flue gas is firstly heated to 300-600 ℃ through a combustion furnace 12 and then sent to the pulverized coal preheater 11, and pulverized coal is preheated to 200-500 ℃ through the pulverized coal preheater 11; the flue gas after heat exchange enters an air/coal gas preheating system 2 for preheating air and/or coal gas, the temperature of the preheated air/coal gas is 150-400 ℃, and the temperature of a flue gas outlet of the air/coal gas preheating system 2 is 150-250 ℃.
The fuel for the furnace 12 is blast furnace gas or other gaseous fuel.
The pulverized coal preheating system 1 includes not only a pulverized coal preheater 11 and a combustion furnace 12, but also a pipeline (such as a pulverized coal conveying pipeline 13, a pulverized coal injection pipeline 14, etc.), an accessory facility (such as a valve, a compensator, etc.), and a detection instrument device. Wherein the combustion furnace 12 can be selectively arranged or not arranged according to the coal powder preheating temperature requirement.
The air/gas preheating system 2 includes, in addition to the gas preheater 21 and the air preheater 22, pipes, accessories (valves, compensators, etc.), and instrumentation devices. According to actual needs of field production, only the gas preheater 21 or only the air preheater 22 can be arranged, and the gas preheater 21 and the air preheater 22 can also be arranged at the same time.
The pulverized coal injection pipeline 14 in the pulverized coal preheating system 1, the combustion air pipeline and the gas pipeline in the air/gas preheating system 2 and the flue gas pipeline connecting the pulverized coal preheating system 1 and the air/gas preheating system 1 are all provided with bypass pipelines, and when one of the preheaters 11, 21 or 22 breaks down, the bypass pipeline can be switched to, so that the normal production of the blast furnace is not influenced.
The coal powder preheating system 1 and the air/coal gas preheating system 2 are both provided with automatic instrument detection devices for temperature detection, pressure detection and the like, and are provided with necessary safety interlocking means to ensure the safe operation of the system.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (3)
1. A blast furnace coal powder injection and hot blast stove air/coal gas series connection preheating system is characterized by comprising a hot blast stove, a coal powder preheating system, an air/coal gas preheating system and a chimney; the pulverized coal preheating system comprises a combustion furnace and a pulverized coal preheater, and the air/coal gas preheating system comprises an air preheater and/or a coal gas preheater; the high-temperature flue gas outlet of the hot blast stove is connected with a flue gas main pipe through a flue gas branch pipe, the flue gas main pipe is respectively connected with a flue gas inlet of a combustion furnace, a heat exchange flue gas inlet of a pulverized coal preheater and a chimney through a flue gas conveying pipe, and the flue gas main pipe is simultaneously and respectively connected with a preheating flue gas inlet of an air preheater and/or a preheating flue gas inlet of a coal gas preheater through the flue gas conveying pipe; the heated flue gas outlet of the combustion furnace is connected with the heat exchange flue gas inlet of the pulverized coal preheater through a heating flue gas pipe; a heat exchange flue gas outlet of the pulverized coal preheater is connected with a preheating flue gas inlet of the air preheater and/or a preheating flue gas inlet of the coal gas preheater through a heat exchange flue gas pipe; the smoke outlet of the air preheater and/or the gas preheater is connected with the chimney through a smoke outlet pipe.
2. The system of claim 1, wherein a valve is disposed on a flue gas manifold downstream of a flue gas duct connected to the air preheater and/or the gas preheater; valves are respectively arranged on the flue gas conveying pipes connected with the combustion furnace, the pulverized coal preheater, the air preheater and the coal gas preheater; valves are respectively arranged on the heating flue gas pipe, the heat-exchanged flue gas pipe and the flue gas outlet pipe.
3. The preheating system of claim 1, wherein the gas preheater and the air preheater are plate heat exchangers or tubular heat exchangers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920676782.9U CN210215414U (en) | 2019-05-13 | 2019-05-13 | Blast furnace coal powder injection and hot blast stove air/coal gas series preheating system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920676782.9U CN210215414U (en) | 2019-05-13 | 2019-05-13 | Blast furnace coal powder injection and hot blast stove air/coal gas series preheating system |
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| CN210215414U true CN210215414U (en) | 2020-03-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110129497A (en) * | 2019-05-13 | 2019-08-16 | 鞍钢集团工程技术有限公司 | Pulverized coal injection in blast furnace is connected pre-heating technique and system with hot-blast stove air/gas |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110129497A (en) * | 2019-05-13 | 2019-08-16 | 鞍钢集团工程技术有限公司 | Pulverized coal injection in blast furnace is connected pre-heating technique and system with hot-blast stove air/gas |
| CN110129497B (en) * | 2019-05-13 | 2024-04-16 | 鞍钢集团工程技术有限公司 | Series preheating process and system for pulverized coal injection of blast furnace and air/gas of hot blast stove |
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