CN212833932U - Belt roasting and SCR denitration system - Google Patents
Belt roasting and SCR denitration system Download PDFInfo
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- CN212833932U CN212833932U CN202021561116.XU CN202021561116U CN212833932U CN 212833932 U CN212833932 U CN 212833932U CN 202021561116 U CN202021561116 U CN 202021561116U CN 212833932 U CN212833932 U CN 212833932U
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000003546 flue gas Substances 0.000 claims abstract description 46
- 238000001035 drying Methods 0.000 claims abstract description 27
- 238000001816 cooling Methods 0.000 claims abstract description 26
- 238000005086 pumping Methods 0.000 claims abstract description 7
- 238000007599 discharging Methods 0.000 claims abstract description 3
- 238000007664 blowing Methods 0.000 claims description 16
- 238000002791 soaking Methods 0.000 claims description 12
- 238000002485 combustion reaction Methods 0.000 claims description 11
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000009851 ferrous metallurgy Methods 0.000 abstract description 2
- 238000005453 pelletization Methods 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 description 14
- 239000007789 gas Substances 0.000 description 11
- 238000000034 method Methods 0.000 description 8
- 238000007605 air drying Methods 0.000 description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 239000008188 pellet Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
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Abstract
The utility model discloses a belt roasting and SCR deNOx systems belongs to ferrous metallurgy pelletizing technology technical field. The belt type roasting and SCR denitration system comprises a belt type roasting unit, an SCR denitration unit and a chimney, wherein the belt type roasting unit comprises a conveyor belt mechanism, and an air draft drying section, a preheating section, a roasting section and a cooling section which are arranged on the conveyor belt mechanism and are sequentially arranged along the movement direction of the conveyor belt, the roasting section comprises a front roasting section and a rear roasting section, and a main air draft box is arranged below the air draft drying section, the preheating section and the front roasting section; the SCR denitration unit is communicated with the air outlet of the main air pumping box and the air outlet of a cold section; the chimney is used for discharging flue gas generated in the belt type roasting unit and the SCR denitration unit. This belt roasting and SCR deNOx systems has saved SCR deNOx systems's running cost and investment cost, and area is little.
Description
Technical Field
The utility model relates to a ferrous metallurgy pelletizing technology technical field especially relates to a belt roasting and SCR deNOx systems.
Background
The production of oxidized pellet ore has three processes of a vertical furnace method, a grate-rotary kiln method and a belt type roasting machine method, wherein the belt type roasting machine process occupies a main market in the world by virtue of the advantages of small occupied area, low comprehensive energy consumption, high yield and the like, is a leading process technology of the oxidized pellet market in the future, and is gradually developed in China at present.
With the increasingly strict national requirements for air pollution control, the emission control requirements of nitrogen oxides are clarified again, and national and local government policies and enterprises require the promotion of the preparation and the upgrade of denitration devices in the flue gas control of the steel industry. The policy defines specific indexes of ultralow emission in the steel industry as follows: under the condition that the standard oxygen content of the pellet belt type roasting flue gas is 16 percent, the hourly mean emission concentration of nitrogen oxides is not higher than 50mg/Nm3. The denitration process solution of flue gas ultra-low emission index in traditional belt roasting and denitration system usually needs to add auxiliary heating system in denitration system to guarantee going on smoothly of denitration, but because auxiliary heating system's setting makes belt roasting and SCR denitration system have investment cost height, area is big, defects such as system complicacy.
Therefore, a belt type roasting and SCR denitration system with low operation cost and investment cost and small floor area is needed to solve the above technical problems in the prior art.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a belt calcination and SCR deNOx systems, this belt calcination and SCR deNOx systems have saved SCR deNOx systems's running cost and investment cost, and area is little.
To achieve the purpose, the utility model adopts the following technical proposal:
a belt roasting and SCR denitration system, comprising:
the belt type roasting unit comprises a conveyor belt mechanism, and an air draft drying section, a preheating section, a roasting section and a cooling section which are arranged on the conveyor belt mechanism and are sequentially arranged along the movement direction of the conveyor belt, wherein the roasting section comprises a front roasting section and a rear roasting section, and a main air draft box is arranged below the air draft drying section, the preheating section and the front roasting section;
the SCR denitration unit is communicated with the air outlet of the main air pumping box and the air outlet of the first cold section;
and the chimney is used for discharging flue gas generated in the belt type roasting unit and the SCR denitration unit.
As an optimal technical scheme of the belt type roasting and SCR denitration system, the belt type roasting and SCR denitration system further comprises a flue gas heat exchanger, a high-temperature side outlet and a low-temperature side inlet of the flue gas heat exchanger are both connected with the SCR denitration unit, the low-temperature side outlet of the flue gas heat exchanger is communicated with the chimney, and the high-temperature side inlet of the flue gas heat exchanger is communicated with the gas outlet of the main air suction box.
As an optimal technical scheme of the belt type roasting and SCR denitration system, the belt type roasting unit further comprises a main exhaust fan, and the main exhaust fan is used for extracting smoke in the main exhaust box.
As a preferable technical solution of the belt roasting and SCR denitration system, the belt roasting unit further includes a belt roasting unit combustion heat supply system configured to provide heat for the preheating section and the roasting section.
As a preferred technical scheme of the belt type roasting and SCR denitration system, the belt type roasting unit further comprises a soaking section, and the soaking section is located between the roasting section and the cold section.
As an optimal technical scheme of the belt type roasting and SCR denitration system, the belt type roasting unit further comprises a back-heating air box, the back-heating air box is arranged below the back roasting section and the soaking section, and an air outlet of the back-heating air box is communicated with an air inlet of the air draft drying section.
As a preferred technical scheme of the belt type roasting and SCR denitration system, the belt type roasting unit further comprises a second cooling section, and the second cooling section is positioned at the downstream of the first cooling section.
As a preferred technical scheme of the belt type roasting and SCR denitration system, the belt type roasting unit further comprises a cooling air bellow which is arranged below the first cold section and the second cold section.
As an optimal technical scheme of the belt type roasting and SCR denitration system, the belt type roasting unit further comprises a blast drying section, the blast drying section is located at the upstream of the induced draft drying section, and the gas outlet of the blast drying section is communicated with the chimney.
As a preferred technical scheme of the belt type roasting and SCR denitration system, the belt type roasting unit further comprises a dry air blowing box, the dry air blowing box is located below the dry air blowing section, and an air inlet of the dry air blowing box is communicated with an air outlet of the secondary cooling section.
The utility model provides a belt roasting and SCR denitration system, which comprises a belt roasting unit, wherein the belt roasting unit comprises an air draft drying section, a preheating section, a roasting section and a cold section, the roasting section comprises a front roasting section and a rear roasting section, the air draft drying section, the preheating section and a main air draft box are arranged below the front roasting section, an air outlet in the main air draft box and an air outlet of the cold section are both communicated with the SCR denitration unit, so that the flue gas with higher temperature in the main air draft box provides heat for the SCR denitration unit, when the flue gas in the main air draft box is not enough to meet the heat required by the SCR denitration unit, the air with higher temperature discharged by the cold section can also provide heat for the SCR denitration unit, thereby realizing that the flue gas temperature reaches the reaction temperature of the SCR denitration unit, and no additional auxiliary heating system is needed, the investment and the operation cost are saved, and the occupied area is small.
Drawings
Fig. 1 is a schematic diagram of a belt type roasting and SCR denitration system according to an embodiment of the present invention.
Reference numerals:
100. a belt type roasting unit; 200. an SCR denitration unit; 300. a flue gas heat exchanger; 400. a chimney;
1. a conveyor belt mechanism; 2. an air draft drying section; 3. a preheating section; 4. a roasting section; 41. a pre-baking section; 42. a post-baking section; 5. a soaking section; 6. a cold stage; 7. a main air pumping box; 8. a main exhaust fan; 9. a belt type roasting unit combustion heat supply system; 10. a forced air drying section; 11. a second cooling section; 12. a cooling air box; 13. a dry air blowing box; 14. a regenerative air bellow; 15. a heat regenerative fan; 16. a cooling fan; 17. a combustion air duct; 18. a gas pipeline; 19. a blower fan; 20. a furnace hood fan; 21. heated air circulation fan.
Detailed Description
In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the technical solution of the present invention will be further explained by combining the drawings and by means of the specific implementation manner.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
As shown in fig. 1, the embodiment provides a belt type roasting and SCR denitration system, which includes a belt type roasting unit 100, an SCR denitration unit 200 and a chimney 400, wherein the belt type roasting unit 100 includes a conveyor belt mechanism 1, and an air draft drying section 2, a preheating section 3, a roasting section 4 and a cooling section 6 which are arranged on the conveyor belt mechanism 1 and are sequentially arranged along the movement direction of the conveyor belt, the roasting section 4 includes a front roasting section 41 and a rear roasting section 42, and a main air draft box 7 is arranged below the air draft drying section 2, the preheating section 3 and the front roasting section 41; the SCR denitration unit 200 is communicated with the air outlet of the main air pumping box 7 and the air outlet of the cold section 6; the stack 400 is used to discharge flue gas generated in the belt roasting unit 100 and the SCR denitration unit 200.
The gas outlet in the main air box 7 and the gas outlet of a cold section 6 all communicate with SCR denitration unit 200, make the higher flue gas of temperature in the main air box 7 provide the heat for SCR denitration unit 200, when the flue gas in the main air box 7 is not enough to satisfy the required heat of SCR denitration unit 200, the higher air of a cold section 6 exhaust temperature also can provide the heat for SCR denitration unit 200, thereby realize that the flue gas temperature reaches the reaction temperature of SCR denitration unit 200, and need not to increase extra auxiliary heating system, investment and running cost have been saved, and area is little.
Preferably, the belt type roasting and SCR denitration system further includes a flue gas heat exchanger 300, a high temperature side outlet and a low temperature side inlet of the flue gas heat exchanger 300 are both connected with the SCR denitration unit 200, a low temperature side outlet of the flue gas heat exchanger 300 is communicated with the chimney 400, and a high temperature side inlet of the flue gas heat exchanger 300 is communicated with the gas outlet of the main pumping box 7. The high-temperature flue gas discharged from the main air pumping box 7 passes through the flue gas heat exchanger 300 from a high-temperature side inlet and is converged with high-temperature air discharged from a cold section 6 at a high-temperature side outlet, so that the mixed high-temperature flue gas heats the SCR denitration unit 200 to the reaction temperature, then the high-temperature flue gas enters the flue gas heat exchanger 300 again through the low-temperature side inlet through the SCR denitration unit 200, and the mixed flue gas also has certain heat, so that the mixed flue gas in the low-temperature pipe section of the flue gas heat exchanger 300 and the flue gas in the high-temperature pipe section exchange heat in the flue gas heat exchanger 300, the mixed flue gas is cooled back to the temperature range before entering the flue gas heat exchanger 300, and finally the mixed flue gas is discharged into the chimney 400 without changing the exhaust gas; and the flue gas in the high-temperature pipe section is preheated and heated, so that the supply amount of high-temperature air in a cold section 6 at the high-temperature side outlet can be reduced.
Further optionally, the belt roasting unit 100 further includes a main exhaust fan 8, and the main exhaust fan 8 is configured to exhaust the flue gas in the main exhaust box 7, so that the high-temperature flue gas in the main exhaust box 7 smoothly enters the flue gas heat exchanger 300, and finally enters the SCR denitration unit 200 to provide heat for the SCR denitration unit 200. Still optionally, the belt roasting unit 100 further includes a heated air circulating fan 21, and the heated air circulating fan 21 is disposed on a pipeline connecting the cold section 6 and the SCR denitration unit 200, and is configured to enable high-temperature air in the cold section 6 to smoothly enter the SCR denitration unit 200 and provide heat for the SCR denitration unit 200.
As shown in fig. 1, the belt roasting unit 100 further comprises a belt roasting unit combustion heat supply system 9, the belt roasting unit combustion heat supply system 9 being configured to provide heat to the preheating section 3 and the roasting section 4. The heat source for operating the belt type roasting and SCR denitration system comes from a belt type roasting unit combustion heat supply system 9.
As shown in fig. 1, the belt roasting unit 100 further includes a soaking section 5, and the soaking section 5 is located between the roasting section 4 and a cooling section 6. Optionally, the belt type roasting unit 100 further includes a back-heating wind box 14, the back-heating wind box 14 is disposed below the back roasting section 42 and the soaking section 5, and a gas outlet of the back-heating wind box 14 is communicated with a gas inlet of the air-extracting drying section 2. Optionally, the belt type roasting unit 100 further includes a back-heating fan 15, and the back-heating fan 15 is disposed on a pipeline connecting the air outlet of the back-heating air bellows 14 and the air inlet of the exhaust drying section 2, and is configured to enable high-temperature flue gas in the back-heating air bellows 14 to smoothly enter the exhaust drying section 2.
As shown in fig. 1, the belt roasting unit 100 further comprises a second cold stage 11, the second cold stage 11 being located downstream of the first cold stage 6. Optionally, the belt roasting unit 100 further comprises a cooling air bellows 12, and the cooling air bellows 12 is disposed below the first and second cold sections 6 and 11. Preferably, the belt roasting unit 100 further comprises a cooling fan 16, the cooling fan 16 is connected to the cooling wind box 12 through a pipeline, the cooling fan 16 sucks natural air in the environment, the cooling wind passes through the burned pellet layers in the first cold section 6 and the second cold section 11 and is heated into high-temperature air of 700-900 ℃, the high-temperature air passing through the first cold section 6 enters the combustion-supporting wind pipeline 17 of the belt roasting unit combustion heat supply system 9 to provide high-temperature combustion-supporting wind for the belt roasting unit combustion heat supply system 9, and gas fuel is introduced into the gas pipeline 18 to provide fuel for the belt roasting unit combustion heat supply system 9.
As shown in fig. 1, the belt roasting unit 100 further includes a forced air drying section 10, the forced air drying section 10 is located upstream of the induced draft drying section 2, and an air outlet of the forced air drying section 10 is communicated with a chimney 400. Optionally, the belt roasting unit 100 further comprises a dry air blowing box 13, the dry air blowing box 13 is located below the dry air blowing section 10, and an air inlet of the dry air blowing box 13 is communicated with an air outlet of the secondary cooling section 11. Optionally, the belt roasting unit 100 further includes a dry air blower 19 and a furnace hood blower 20, wherein the dry air blower 19 is disposed on a pipeline connecting an air inlet of the dry air blower 13 and an air outlet of the secondary cooling section 11, and the furnace hood blower 20 is disposed on a pipeline connecting an air outlet of the dry air blower 10 and the chimney 400.
It should be noted that the forced air drying section 10 is composed of a working cavity and a furnace cover of the forced air drying section on the working cavity; the air draft drying section 2 consists of a working cavity and an air draft drying section furnace cover positioned on the working cavity; the preheating section 3 consists of a working cavity and a preheating section furnace cover positioned on the working cavity; the roasting section 4 consists of a working cavity and a roasting section furnace cover positioned on the working cavity; the soaking section 5 consists of a working cavity and a soaking section furnace cover positioned on the working cavity; the cold section 6 consists of a working cavity and a cold section furnace cover positioned on the working cavity; the second cold section 11 is composed of a working cavity and a second cold section furnace cover positioned on the working cavity. The belt roasting and SCR denitration system provided by the embodiment selects a proper process flow sequence to cooperate with other environment-friendly equipment (such as a dust removal device and a desulfurization device) to carry out environment-friendly comprehensive treatment according to flue gas parameters and system requirements, and is more flexible in arrangement.
The above description is only for the preferred embodiment of the present invention, and for those skilled in the art, there are variations on the detailed description and the application scope according to the idea of the present invention, and the content of the description should not be construed as a limitation to the present invention.
Claims (10)
1. The utility model provides a belt roasting and SCR deNOx systems which characterized in that includes:
the belt type roasting unit (100), the belt type roasting unit (100) comprises a conveyor belt mechanism (1), and an air draft drying section (2), a preheating section (3), a roasting section (4) and a cooling section (6) which are arranged on the conveyor belt mechanism (1) and are sequentially arranged along the moving direction of the conveyor belt, the roasting section (4) comprises a front roasting section (41) and a rear roasting section (42), and a main air draft box (7) is arranged below the air draft drying section (2), the preheating section (3) and the front roasting section (41);
the SCR denitration unit (200) is communicated with the air outlet of the main air pumping box (7) and the air outlet of the first cooling section (6);
a chimney (400), the chimney (400) being used for discharging flue gas generated in the belt roasting unit (100) and the SCR denitration unit (200).
2. The belt roasting and SCR denitration system according to claim 1, further comprising a flue gas heat exchanger (300), wherein a high temperature side outlet and a low temperature side inlet of the flue gas heat exchanger (300) are both connected to the SCR denitration unit (200), a low temperature side outlet of the flue gas heat exchanger (300) is communicated with the chimney (400), and a high temperature side inlet of the flue gas heat exchanger (300) is communicated with an air outlet of the main air draft box (7).
3. The belt roasting and SCR denitration system according to claim 1, wherein the belt roasting unit (100) further comprises a main exhaust fan (8), and the main exhaust fan (8) is used for extracting flue gas in the main exhaust box (7).
4. The belt roasting and SCR denitration system according to claim 1, wherein the belt roasting unit (100) further comprises a belt roasting unit combustion heat supply system (9), the belt roasting unit combustion heat supply system (9) being configured to provide heat for the preheating section (3) and the roasting section (4).
5. The belt roasting and SCR denitration system according to claim 1, wherein the belt roasting unit (100) further comprises a soaking section (5), and the soaking section (5) is located between the roasting section (4) and the one cold section (6).
6. The belt roasting and SCR denitration system according to claim 5, wherein the belt roasting unit (100) further comprises a heat returning air box (14), the heat returning air box (14) is disposed below the post-roasting section (42) and the soaking section (5), and an air outlet of the heat returning air box (14) is communicated with an air inlet of the air draft drying section (2).
7. The belt roasting and SCR denitration system according to claim 1, wherein the belt roasting unit (100) further comprises a second cold stage (11), and the second cold stage (11) is located downstream of the first cold stage (6).
8. The belt roasting and SCR denitration system according to claim 7, wherein the belt roasting unit (100) further comprises a cooling air box (12), and the cooling air box (12) is disposed below the first cold stage (6) and the second cold stage (11).
9. The belt roasting and SCR denitration system according to claim 7, wherein the belt roasting unit (100) further comprises an air-blowing drying section (10), the air-blowing drying section (10) is located upstream of the air-draft drying section (2), and an air outlet of the air-blowing drying section (10) is communicated with the chimney (400).
10. The belt roasting and SCR denitration system according to claim 9, wherein the belt roasting unit (100) further comprises a dry air blowing box (13), the dry air blowing box (13) is located below the dry air blowing section (10), and an air inlet of the dry air blowing box (13) is communicated with an air outlet of the secondary cooling section (11).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021561116.XU CN212833932U (en) | 2020-07-31 | 2020-07-31 | Belt roasting and SCR denitration system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021561116.XU CN212833932U (en) | 2020-07-31 | 2020-07-31 | Belt roasting and SCR denitration system |
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| CN212833932U true CN212833932U (en) | 2021-03-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113802018A (en) * | 2021-10-18 | 2021-12-17 | 中冶北方（大连）工程技术有限公司 | Preparation of V based on a straight grate2O5Pellet system and method |
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2020
- 2020-07-31 CN CN202021561116.XU patent/CN212833932U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113802018A (en) * | 2021-10-18 | 2021-12-17 | 中冶北方（大连）工程技术有限公司 | Preparation of V based on a straight grate2O5Pellet system and method |
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