CN202576449U - Coal dust conveying and preheating process apparatus in coal injection process of blast furnace - Google Patents
Coal dust conveying and preheating process apparatus in coal injection process of blast furnace Download PDFInfo
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- CN202576449U CN202576449U CN 201220155014 CN201220155014U CN202576449U CN 202576449 U CN202576449 U CN 202576449U CN 201220155014 CN201220155014 CN 201220155014 CN 201220155014 U CN201220155014 U CN 201220155014U CN 202576449 U CN202576449 U CN 202576449U
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Abstract
The utility model relates to a coal dust conveying and preheating process apparatus in a coal injection process of a blast furnace. Specifically the coal injection process includes the following steps of: adopting non-combustion gases to convey and inject coal dust, preheating the coal dust until the temperature reaches 350 DEG C or more and is equal to or higher than the ignition temperature of the coal dust before feeding the coal dust into a blast furnace, and then injecting the coal dust into the blast furnace through a coal dust distributor and a coal injection pipe, so that the combustion speed and the combustion rate of the coal dust are substantially improved, the influence caused by non-burnout of the coal dust to the smooth operation of the blast furnace is solved, thus, the coal powder injection volume is greatly improved up to 300 kg/t or more, the coal-to-coke replacement ratio is obviously improved, the valuable coke resource is saved, and the economic benefit is improved.
Description
Technical field
The utility model relates to process matched therewith in a kind of iron and steel enterprise blast furnace ironmaking process, is specially coal dust conveying and pre-heating technique device in a kind of pulverized coal injection in blast furnace process.
Background technology
At present; The blast furnace blowing technical development is very fast, goes into stove wind-warm syndrome technology through oxygen enrichment, raising, and a ton iron injecting coal quantity has reached 200kg; The blast furnace that has of Baosteel once reached 250kg; But along with the raising of injecting coal quantity, the direct motion of blast furnace is brought very big influence, the stable injecting coal quantity of most of blast furnace is at 150～180kg.Major cause is that the gas of coal injection is pressurized air, and in order to prevent blast, usually the coal dust temperature is controlled in 80 ℃, therefore when the coal dust that sprays in a large number; Can cause the blast-furnace tuyere temperature seriously to descend, general every spray 10kg hard coal draught temperature descends 15～25 ℃, so just worsens the combustion conditions of coal dust in the air port; Cause coal dust before the air port, not burn in the eddy flow district, the coal gas that unburned coal powder can be risen is taken the district of circling round out of, to melting or zone of transformation; Stop up the gap of stock column, worsen the ventilation property of stock column, make smooth operation of furnace unfavorable; There is the part unburned coal powder to get in the slag in addition, increases the quantity of slag, even have the part carbon granule to be taken out of stove to slattern outward by coal gas.
The utility model content
Goal of the invention: in order to overcome the deficiency that exists in the prior art; The utility model provides the coal dust in a kind of pulverized coal injection in blast furnace process to carry and the pre-heating technique device, can increase substantially the temperature that coal dust is gone into the stokehold, makes its temperature meet or exceed kindling temperature;, coal dust burns immediately when getting into the air port; Solved temperature decline phenomenon before the air port of being caused, guaranteed that coal dust can fully burn in the district of circling round, and has guaranteed blast furnace direct motion when the big coal injection amount owing to a large amount of Coal powder spray.
Technical scheme: for solving the problems of the technologies described above; Coal dust in the pulverized coal injection in blast furnace process of the utility model is carried and the pre-heating technique device; Adopt non-combustion-supporting delivering gas, carry and coal injection, will be before winding-up through preheating unit to pulverized coal preheating; Make coal dust temperature meet or exceed kindling temperature, carry out coal powder injection through pulverized coal distributor and coal powder injection pipe to blast furnace then into the stokehold.
Specifically; In the utility model; Coal dust in the pulverized coal injection in blast furnace process is carried and preheating unit; Comprise gas compressor, breeze blowing jar, mixing tank, preheating unit, coal spraying pipeline and non-combustion-supporting defeated coal gas body, establish connecting tube and gas regulating valve between the delivering gas import of the outlet of gas compressor and mixing tank, establish connecting tube and coal supply valve between the discharge of winding-up jar and the coal dust import of mixing tank; Establish connecting tube between the coal dust import of the discharge of mixing tank and preheating unit, establish winding-up pipe and coal powder injection variable valve between the discharge of preheating unit and the blast furnace.
Described non-combustion-supporting defeated coal gas body is the mixture of flue gas, blast furnace gas, coke-oven gas, coal gas of converter, natural gas, nitrogen and above two kinds of gases or multiple gases.
Establish non-combustion-supporting gas buffer tank on the connecting tube between the delivering gas import of described outlet and mixing tank at gas compressor.
Establish pulverized coal distributor between the discharge of described preheating unit and the winding-up pipe, establish connecting tube between the discharge of preheating unit and the pulverized coal distributor, pulverized coal distributor links to each other with end winding-up pipe, and the other end of winding-up pipe links to each other with high furnace coal fines lance.
Described preheating unit is direct preheating unit or indirect preheating device.
Described direct preheating unit is produced high-temperature flue gas by process furnace burning coal gas and through the coal dust interchanger coal dust is carried out direct heating.
Described indirect preheating device is produced high-temperature flue gas through the intermediate medium heat exchanger by process furnace burning coal gas; Middle medium is heated; Intermediate medium after the preheating is admitted to the coal dust interchanger through pipeline coal dust is heated; Intermediate medium through the heat exchange of coal dust interchanger after, squeezed into again by the intermediate medium recycle pump in the intermediate medium heat exchanger of process furnace and reheat, circulate then coal dust heated.
The intermediate medium that described indirect preheating device is heated is water or thermal oil.
The fuel of described process furnace is blast furnace gas, coke-oven gas or coal gas of converter.
When described non-combustion-supporting defeated coal gas body is nitrogen; Nitrogen pipeline is connected with the outlet conduit of gas compressor; When non-combustion-supporting defeated coal gas body was flue gas, blast furnace gas, coke-oven gas, coal gas of converter, natural gas, non-combustion-supporting defeated coal gas body pipeline linked to each other with the import of gas compressor.。
Beneficial effect: the coal dust in the pulverized coal injection in blast furnace process of the utility model is carried and preheating unit, has the following advantages:
The temperature of coal dust when increasing substantially coal powder injection; Make it meet or exceed igniting temperature of pulverized-coal; And then when extensive coal powder injection, the draught temperature of stokehold is not had influence or influence is very little, make the coke in the blast furnace only bear skeleton function; And do not bear heating and reductive action, this part effect is all born by the coal dust that is sprayed.Can guarantee under the smooth operation of furnace situation that like this ton iron injecting coal quantity can reach more than the 300kg, thus the coal-to-coke replacement of increasing substantially.
In a word, the coal dust in the pulverized coal injection in blast furnace process of the utility model is carried and the pre-heating technique device, can practice thrift significantly and protect your coke resource, produces remarkable economic efficiency and social benefit.
Description of drawings
Fig. 1 is that the coal dust in the utility model pulverized coal injection in blast furnace process is carried and pre-heating technique device synoptic diagram;
1, gas compressor 2, non-combustion-supporting delivering gas buffer tank 3, mixing tank 4, winding-up jars 5, preheating unit 6, pulverized coal distributor 7, winding-up pipe 8, blast furnace
Fig. 2 is the preheating unit synoptic diagram of embodiment one
9, preheating unit advance coal pipe 10, coal dust interchanger 11, process furnace 12, preheating unit go out coal pipe 13, induced draft fan 14, burner 15, blast furnace gas pipeline 16, fan
Fig. 3 is the preheating unit synoptic diagram of embodiment two
9, preheating unit advance coal pipe 10, coal dust interchanger 11, process furnace 12, preheating unit go out coal pipe 13, induced draft fan 14, burner 15, blast furnace gas pipeline 16, fan 17, intermediate medium heat exchanger 18, intermediate medium recycle pump 19, intermediate medium surge tank
Embodiment
Below in conjunction with accompanying drawing the utility model is done explanation further.
Embodiment one:
As depicted in figs. 1 and 2; Coal dust in the pulverized coal injection in blast furnace process of the utility model is carried and the pre-heating technique device, mainly comprise gas compressor (1), non-combustion-supporting delivering gas buffer tank (2), mixing tank (3), winding-up jar (4), a preheating unit (5), pulverized coal distributor (6), winding-up pipe (7), blast furnace (8), preheating unit advance coal pipe (9), coal dust interchanger (10), process furnace (11), preheating unit go out coal pipe (12), induced draft fan (13), burner (14), blast furnace gas pipeline (15), fan (16), non-combustion-supporting delivering gas adopts blast furnace gas; After gas compressor (1) pressurization; Become the conveying blowing media, get in the mixing tank (3) through connecting tube, the coal dust injection in will jet jar (4) is transported in the preheating unit (5) and carries out preheating; Preheating unit (5) is the direct heating device; Process furnace (11) produces high-temperature flue gas and is carried out the preheating coal dust in the induced draft fan introducing coal dust interchanger (10) through burner (14) burning blast furnace gas, and coal dust interchanger (10) is a tube and shell heat exchanger; Coal dust is walked in the pipe; High-temperature flue gas is walked outside the pipe, and by the induced draft fan carrying-off, the blast furnace gas after the coal dust after the preheating is compressed is conveyed in the pulverized coal distributor (6) through the flue gas after the heat exchange; Be assigned to each winding-up pipe (7) then, send into high furnace coal fines lance and in blast furnace, carry out coal powder injection.The non-combustion-supporting delivering gas buffer tank of establishing in the present embodiment (2) is in order to guarantee to carry blowing media (blast furnace gas after the pressurization) pressure-stabilisation, and then guarantees that injecting coal quantity is uniform and stable, can also protect compressor in addition.On connecting tube between the outlet of gas compressor (1) and the non-combustion-supporting delivering gas buffer tank (2), press nitrogen tube in the parallel connection, be used for maintenance or purging system when breaking down, play security personnel and act on.
Embodiment two:
As shown in figures 1 and 3; Coal dust in the pulverized coal injection in blast furnace process of the utility model is carried and the pre-heating technique device; Mainly comprise gas compressor (1), non-combustion-supporting delivering gas buffer tank (2), mixing tank (3), winding-up jar (4), preheating unit (5), pulverized coal distributor (6), winding-up pipe (7), blast furnace (8); Non-combustion-supporting delivering gas adopts coke-oven gas, after gas compressor (1) pressurization, becomes delivery medium; Get in the mixing tank (3) through connecting tube, the coal dust injection in will jet jar (4) is transported in the preheating unit (5) and carries out preheating; Preheating unit (5) is an indirect heating apparatus; Process furnace (11) produces high-temperature flue gas and is carried out the preheating intermediate medium in induced draft fan (16) the introducing intermediate medium heat exchanger (17) through burner (14) burning blast furnace gas, and the flue gas after the heat exchange of process intermediate medium heat exchanger (17) is by induced draft fan (16) carrying-off; Intermediate medium is a thermal oil; High temperature heat conductive oil after intermediate medium heat exchanger (17) heat exchange is admitted to coal dust interchanger (10) heating coal dust through pipeline, and the coal dust interchanger is a tube and shell heat exchanger, and coal dust is walked in the pipe; Thermal oil is walked outside the pipe; Through the thermal oil after the heat exchange, squeezed into again by intermediate medium recycle pump (18) in the intermediate medium heat exchanger (17) of process furnace (11) and reheat, circulate then coal dust is heated; Coke-oven gas after coal dust after the preheating is compressed is conveyed in the pulverized coal distributor (6), is assigned to each winding-up pipe (7) then, sends into blast furnace (8) pulverized coal gun and in blast furnace, carries out coal powder injection.The non-combustion-supporting delivering gas buffer tank of establishing in the present embodiment (2) is in order to guarantee to carry blowing media (blast furnace gas after the pressurization) pressure-stabilisation, and then guarantees that injecting coal quantity is uniform and stable, can also protect compressor in addition.The intermediate medium surge tank of establishing in the present embodiment (19) is in order to guarantee the safe operation of process furnace (11), intermediate medium interchanger (17) and intermediate medium recycle pump (18).On connecting tube between the outlet of gas compressor (1) and the non-combustion-supporting delivering gas buffer tank (2), press nitrogen tube in the parallel connection, be used for maintenance or purging system when breaking down, play security personnel and act on.
Above content is combined, and the coal dust that is in the utility model utilization pulverized coal injection in blast furnace process is carried and the pre-heating technique device.
The above only is the preferred implementation of the utility model; Be noted that for those skilled in the art; Under the prerequisite that does not break away from the utility model principle; Can also make some improvement and retouching, these improvement and retouching also should be regarded as the protection domain of the utility model.
Claims (10)
1. the coal dust in the pulverized coal injection in blast furnace process is carried and the pre-heating technique device; It is characterized in that: comprise gas compressor (1), mixing tank (3), breeze blowing jar (4), preheating unit (5), coal spraying pipeline (7) and non-combustion-supporting defeated coal gas body; Establish connecting tube and gas regulation valve between the delivering gas import of the outlet of gas compressor (1) and mixing tank (3); Establish connecting tube and coal supply valve between the coal dust import of the discharge of breeze blowing jar (4) and mixing tank (3); Establish connecting tube between the coal dust import of the discharge of mixing tank (3) and preheating unit (5), establish winding-up pipe (7) and coal powder injection variable valve between the discharge of preheating unit (5) and blast furnace (8) pulverized coal gun.
2. carry and the pre-heating technique device according to the coal dust in claim 1 pulverized coal injection in blast furnace process, it is characterized in that: non-combustion-supporting defeated coal gas body is the mixture of flue gas, blast furnace gas, coke-oven gas, coal gas of converter, natural gas, nitrogen and above two kinds of gases or multiple gases.
3. carry and the pre-heating technique device according to the coal dust in claim 1 pulverized coal injection in blast furnace process, it is characterized in that: establishing non-combustion-supporting gas buffer tank (2) on the pipe connecting between the delivering gas import of gas compressor (1) outlet and mixing tank (3).
4. carry and preheating unit according to the coal dust in claim 1 pulverized coal injection in blast furnace process; It is characterized in that: establish pulverized coal distributor (6) between the discharge of preheating unit (5) and the winding-up pipe (7); Establish connecting tube between the discharge of preheating unit (5) and the pulverized coal distributor (6); Pulverized coal distributor (6) links to each other with an end of winding-up pipe (7), and the other end of winding-up pipe (7) links to each other with blast furnace (8) pulverized coal gun.
5. carry and the pre-heating technique device according to the coal dust in claim 1 pulverized coal injection in blast furnace process, it is characterized in that: preheating unit (4) is direct preheating unit or indirect preheating device.
6. carry and the pre-heating technique device according to the coal dust in claim 5 pulverized coal injection in blast furnace process, it is characterized in that: direct preheating unit is produced high-temperature flue gas by process furnace (11) burning coal gas and through coal dust interchanger (10) coal dust is carried out direct heating.
7. carry and the pre-heating technique device according to the coal dust in claim 5 pulverized coal injection in blast furnace process; It is characterized in that: the indirect preheating device is produced high-temperature flue gas by process furnace (11) burning coal gas and through intermediate medium heat exchanger (17) middle medium is heated; Intermediate medium is admitted to coal dust interchanger (10) through pipeline coal dust is heated; After the heat exchange of intermediate medium process coal dust interchanger (10); Again the intermediate medium heat exchanger (17) of being squeezed into process furnace (11) by intermediate medium recycle pump (18) reheats, and circulates then coal dust is heated.
8. carry and the pre-heating technique device according to the coal dust in claim 5 pulverized coal injection in blast furnace process, it is characterized in that: the intermediate medium that the indirect preheating device is heated is water or thermal oil.
9. carry and the pre-heating technique device according to the coal dust in claim 6 and claim 7 pulverized coal injection in blast furnace process, it is characterized in that: the incendiary coal gas of process furnace is blast furnace gas, coke-oven gas or coal gas of converter.
10. carry and the pre-heating technique device according to the coal dust in claim 1 and claim 2 pulverized coal injection in blast furnace process, it is characterized in that: when non-combustion-supporting defeated coal gas body was nitrogen, nitrogen pipeline was connected with the outlet conduit of gas compressor (1); When non-combustion-supporting defeated coal gas body was flue gas, blast furnace gas, coke-oven gas, coal gas of converter, natural gas, non-combustion-supporting defeated coal gas body pipeline linked to each other with the import of gas compressor (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220155014 CN202576449U (en) | 2012-04-13 | 2012-04-13 | Coal dust conveying and preheating process apparatus in coal injection process of blast furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220155014 CN202576449U (en) | 2012-04-13 | 2012-04-13 | Coal dust conveying and preheating process apparatus in coal injection process of blast furnace |
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| CN202576449U true CN202576449U (en) | 2012-12-05 |
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| CN 201220155014 Expired - Fee Related CN202576449U (en) | 2012-04-13 | 2012-04-13 | Coal dust conveying and preheating process apparatus in coal injection process of blast furnace |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102605119A (en) * | 2012-04-13 | 2012-07-25 | 孙慕文 | Pulverized coal conveying and preheating device used in blast furnace pulverized coal blasting process |
| CN105202871A (en) * | 2014-06-26 | 2015-12-30 | 东至天孚化工有限公司 | Drying machine special for toxic substances |
-
2012
- 2012-04-13 CN CN 201220155014 patent/CN202576449U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102605119A (en) * | 2012-04-13 | 2012-07-25 | 孙慕文 | Pulverized coal conveying and preheating device used in blast furnace pulverized coal blasting process |
| CN102605119B (en) * | 2012-04-13 | 2016-08-03 | 孙慕文 | Coal dust conveying during a kind of pulverized coal injection in blast furnace and pre-heating technique device |
| CN105202871A (en) * | 2014-06-26 | 2015-12-30 | 东至天孚化工有限公司 | Drying machine special for toxic substances |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121205 Termination date: 20180413 |
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| CF01 | Termination of patent right due to non-payment of annual fee |