CN210036269U - Chain grate machine upper cover hot air system - Google Patents
Chain grate machine upper cover hot air system Download PDFInfo
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- CN210036269U CN210036269U CN201920840723.0U CN201920840723U CN210036269U CN 210036269 U CN210036269 U CN 210036269U CN 201920840723 U CN201920840723 U CN 201920840723U CN 210036269 U CN210036269 U CN 210036269U
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- waste gas
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- upper cover
- chain grate
- air
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- 239000002912 waste gas Substances 0.000 claims abstract description 103
- 238000001816 cooling Methods 0.000 claims abstract description 44
- 238000001035 drying Methods 0.000 claims abstract description 40
- 239000000428 dust Substances 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 19
- 230000001105 regulatory effect Effects 0.000 claims abstract description 6
- 230000001172 regenerating effect Effects 0.000 claims description 18
- 238000007664 blowing Methods 0.000 claims description 4
- 239000003638 chemical reducing agent Substances 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 10
- 238000005453 pelletization Methods 0.000 abstract description 6
- 239000008188 pellet Substances 0.000 description 29
- 239000000463 material Substances 0.000 description 13
- 238000007605 air drying Methods 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 9
- 239000007789 gas Substances 0.000 description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 7
- 239000003546 flue gas Substances 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 238000006477 desulfuration reaction Methods 0.000 description 3
- 230000023556 desulfurization Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- Drying Of Solid Materials (AREA)
Abstract
The utility model relates to a chain grate machine upper cover hot air system, which comprises a chain grate machine, a chain grate machine upper cover, an air blast drying section waste gas pipeline, a furnace cover dust remover, a secondary cooling section waste gas pipeline, a heat return air pipeline and a regulating valve; the auxiliary heating device is arranged on the two-cold-section waste gas main pipe, the two-cold-section waste gas branch pipe I is arranged on the two-cold-section waste gas main pipe, the other end of the two-cold-section waste gas branch pipe I is connected to a pipeline at a dust removal inlet of the furnace cover, the two-cold-section waste gas main pipe is provided with the two-cold-section waste gas branch pipe II, and the other end of the two-cold-section waste gas branch pipe II is connected to the side face of the chain grate machine preheating section upper cover; and a back-heating air branch pipe II is arranged on the back-heating air main pipe and is connected with the two cold section waste gas branch pipes II. The utility model discloses can not only adjust the dry section exhaust temperature of chain grate machine blast air, can also adjust the air current temperature who gets into to preheat different positions in one section upper shield, make the pelletizing preheat one section intensification process controllable.
Description
Technical Field
The utility model belongs to the technical field of the production of iron and steel metallurgical industry pellet ore, concretely relates to chain grate machine upper shield hot air system.
Background
At present, a grate-rotary kiln-circular cooler process is one of the main production processes for producing iron ore pellets.
On the chain grate machine, the green pellets are heat treated, and the drying and preheating processes of the green pellets are completed by carrying out cross flow heat exchange between hot air flow and a material layer. According to the traditional hot air flow, the chain grate machine is divided into four sections according to the temperature of hot air flow and a mode of penetrating through a material layer, a blowing drying section, an exhausting drying section, a preheating section and a preheating section are sequentially arranged along the advancing direction of materials, and the temperature of the hot air flow required by each section of the chain grate machine is determined according to the pellet test result.
The forced air drying is the first process of treating green pellets on a chain grate, the heat source for forced air drying is cooling waste gas (hereinafter referred to as 'three-cold-section waste gas') from the upper cover of the three cold sections of the circular cooler, and hot air flow from bottom to top passes through a green pellet material layer to primarily remove moisture of the green pellets. In order to meet the requirement of emission standard, the moisture-containing waste gas passing through the material layer is discharged after being dedusted by the furnace cover deduster.
The air draft drying is a second procedure for processing the green pellets on a chain grate, the heat source for air draft drying is hot flue gas (called back hot air for short hereinafter and the temperature is generally 350-450 ℃) from a back heating fan of the chain grate, and the hot air flow from top to bottom passes through a green pellet material layer to remove the moisture of the green pellets.
The preheating section is a transition link on a chain grate machine, the heat source of the preheating section is hot waste gas (hereinafter referred to as 'secondary cooling section waste gas', the temperature is generally 600-800 ℃) from an upper cover of a secondary cooling section of the circular cooler, the secondary cooling section waste gas enters the cover from the top of the upper cover of the preheating section in the traditional method, hot gas flow from top to bottom passes through a green ball material layer, residual moisture of the green balls is completely removed, and dry balls are heated to be heated as required.
And the flue gas of the air draft drying section and the preheating section of the air box is collected and then is treated by a main electric dust collector, a main exhaust fan and a desulfurization and denitrification device and then is discharged.
The preheating section is the last link for treating the green pellets on a chain grate, hot flue gas from a rotary kiln penetrates through a material layer from top to bottom, dry pellets are preheated for a certain time at a proper temperature, the strength of the dry pellets meets the requirement of entering the kiln, the flue gas penetrating through the material layer is used as 'hot return air', and the hot return air is sent to an upper cover of the air draft drying section by a heat return fan to be used as a heat source.
After drying and preheating, the green pellets are dewatered and heated, the pellets with certain strength enter a rotary kiln, the pellet roasting process is completed in the kiln, and the roasted high-temperature pellets are discharged into a circular cooler from the rotary kiln.
And finishing the cooling process of the pellet on the circular cooler. According to the traditional hot air flow, the circular cooler is divided into three sections or four sections, the three sections or the four sections are sequentially a first cold section, a second cold section, a third cold section and a fourth cold section along the advancing direction of materials, each section is provided with a cooling fan, normal temperature air is blown into a bellows of the circular cooler, and passes through a material layer from bottom to top to cool pellets. Hot waste gas of the first cold section upper cover (hereinafter referred to as 'first cold section waste gas') enters the rotary kiln to be used as 'secondary air', the second cold section waste gas goes to the chain grate machine to preheat the first section upper cover to be used as a heat source, the third cold section waste gas is blown into a wind box of the chain grate machine air blast drying section to be used as a drying heat source through a dry air blower, and if the four cold sections exist, the hot waste gas of the four cold section upper cover is directly discharged.
In the actual production process, the problem exists that the temperature of the waste gas of the upper cover of the forced air drying section of the chain grate machine is usually low, in order to avoid the condensation phenomenon in a dust remover and a pipeline system, one measure usually adopted is to lead a part of three-cooling section waste gas to be short-circuited from the outlet of a forced air drier to the inlet of a furnace cover dust remover and to be mixed with the waste gas of the upper cover of the forced air drying section, so that the temperature of the waste gas is raised, and the condensation is avoided, therefore, the method can increase the processing air volume of the forced air drier and the furnace cover dust removal system, and the power consumption of related equipment is increased; the other measure for preventing dewing is to introduce a part of the returned hot air to be mixed with the waste gas of the upper cover of the blast drying section, and the method has the advantages that the temperature of the returned hot air is higher than that of the waste gas of the three cooling sections, so that the treatment air quantity of the furnace cover dust remover is relatively reduced, but the returned hot air is flue gas essentially, contains various pollutants generated by fuel combustion, and cannot be removed in the furnace cover dust removal system, and if the flue gas at the outlet of the furnace cover dust remover is merged into the desulfurization and denitrification system, the investment and the operating cost of the desulfurization and denitrification device are greatly increased.
In the actual production process, another problem exists in that the temperature of the waste gas of the secondary cooling section used as a heat source for preheating the primary section is usually lower, which cannot meet the production requirement and influences the quality of the pellet ore. At present, two common methods for improving the temperature of a preheating section of heat source are provided, one method is to arrange an auxiliary heat supply device on the side wall of a preheating section of upper cover of a chain grate machine, and the defects exist that in a limited upper cover space, hot flue gas provided by the auxiliary heat supply device cannot be fully mixed with waste gas of a second cooling section entering the upper cover from the top, and the uniform heating of a material layer is difficult to realize; the other method is that an auxiliary heating device is arranged on a hot waste gas pipeline leading to a preheating section of upper cover of a chain grate machine to integrally heat gas in the pipeline, the method can lead the temperature of the hot waste gas entering the preheating section of upper cover to be consistent, and overcomes the problem of uneven material layer heating, but the method also has the problems that the temperature field in the preheating section of upper cover cannot be regulated and controlled according to requirements, the condition that the temperature rises steeply after pellets enter the preheating section cannot be avoided, green pellets with poor drying effect can crack or even burst when suddenly contacting high temperature, and the production and pellet ore quality are influenced. Therefore, the temperature field of the chain grate machine preheating section upper cover can be adjusted and controlled and is always in a set range, and the method is very important for normal production of iron ore pellets.
Therefore, on one hand, a reasonable temperature regulation mode is adopted, and the treatment capacity of a grate blower drying section furnace cover dust removal system is reduced as much as possible; on the other hand, the hot air supply mode of the chain grate machine for preheating the first section is optimized, so that the temperature rise process of the pellets at the preheating section is controllable, green pellets are prevented from cracking, the drying and preheating effects of the pellets on the chain grate machine are ensured, and the adaptability of the chain grate machine to raw materials is improved.
Disclosure of Invention
An object of the utility model is to provide a grate machine upper shield hot air system reduces grate machine blast air drying section furnace cover dust pelletizing system's handling capacity under the prerequisite that satisfies the temperature requirement, and the control gets into the air current temperature that the grate machine preheated one section upper shield, improves the adaptability of grate machine to the raw materials, creates the condition for grate machine-rotary kiln pelletizing production system energy saving and emission reduction, high-efficient operation.
The utility model aims at realizing through the following technical scheme:
the utility model discloses a hot air system of the upper cover of a chain grate machine, which comprises the chain grate machine, the upper cover of the chain grate machine, a waste gas pipeline of an air blast drying section, a furnace cover dust remover, a waste gas pipeline of a secondary cooling section, a heat return air pipeline and a regulating valve; the chain grate machine upper cover is sequentially divided into an air blowing drying section upper cover, an air draft drying section upper cover, a preheating section upper cover and a preheating section upper cover along the moving direction of the chain grate machine; one end of the waste gas pipeline of the blast drying section is connected with the upper cover of the blast drying section, the other end of the waste gas pipeline of the blast drying section is connected with the inlet of the furnace cover dust remover, and the furnace cover dust remover is communicated with the atmosphere; the upper cover of the air draft drying section is connected with a regenerative air main pipe through a regenerative air branch pipe I.
The method is characterized in that: an auxiliary heating device is arranged on a secondary cooling section waste gas main pipe, a secondary cooling section waste gas branch pipe I is arranged on the secondary cooling section waste gas main pipe in front of the auxiliary heating device, the other end of the secondary cooling section waste gas branch pipe I is connected to a blast drying section waste gas pipeline at a furnace cover dust removal inlet, and an adjusting valve I is arranged on the secondary cooling section waste gas branch pipe I; a second cold section waste gas branch pipe II is arranged on a second cold section waste gas main pipe behind the auxiliary heat supply device, and the other end of the second cold section waste gas branch pipe II is connected with the side surface of the chain grate machine preheating section upper cover;
and a regenerative air branch pipe II is arranged on the regenerative air main pipe and is connected with the two cold section waste gas branch pipes II, and an adjusting valve II is arranged on the regenerative air branch pipe II.
Furthermore, the back heating air branch pipes II are respectively communicated with two cooling section waste gas branch pipes II connected to the front part of the preheating section upper cover through conical reducing pipes.
Compared with the prior art, the utility model has the advantages that:
1) the hot air system of the upper cover of the chain grate machine can reduce the air mixing amount before the furnace cover dust remover on the premise of reaching the same waste gas mixing temperature;
2) the hot air system of the upper cover of the chain grate machine can provide heat through the auxiliary heat supply device, and ensure that the air flow entering the chain grate machine for preheating a section of the upper cover reaches the required temperature;
3) the utility model discloses a chain grate machine upper shield hot air system, when the raw materials condition changes, can change the input of return air through adjusting the regulating valve aperture on return air branch pipe II, reach the purpose that adjusts the chain grate machine and preheat the interior air current temperature of a section upper shield, according to actual production needs, preheat and establish reasonable temperature field in a section upper shield, the air current temperature variation gradient in the intensification process of control pelletizing;
4) the utility model discloses a chain grate machine upper shield hot air system for ensure the chain grate machine dry, preheat the effect and created the condition, be favorable to improving the utilization ratio of chain grate machine.
Drawings
Fig. 1 is a schematic view of the connection of the hot air system of the present invention.
Fig. 2 is a partial sectional view a-a of fig. 1.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
As shown in fig. 1 and 2, the hot air system of the upper cover of the chain grate machine of the present invention comprises a chain grate machine 1, an upper cover of the chain grate machine, an exhaust gas pipeline of an air blast drying section, a furnace cover dust remover, a waste gas pipeline of a secondary cooling section, an auxiliary heating device, a back-heating air pipeline and a regulating valve; the chain grate machine upper cover is sequentially divided into an air blowing drying section upper cover 1-1, an air draft drying section upper cover 1-2, a preheating section upper cover 1-3 and a preheating section upper cover 1-4 along the movement direction of the chain grate machine 1; one end of the waste gas pipeline 2 of the blast drying section is connected with the upper cover 1-1 of the blast drying section, the other end of the waste gas pipeline is connected with the inlet of the furnace cover dust remover 3, and the furnace cover dust remover 3 is communicated with the atmosphere; the upper cover 1-2 of the air draft drying section is connected with a regenerative air main pipe 6 through a regenerative air branch pipe I10;
the method is characterized in that: an auxiliary heating device 5 is arranged on a secondary cooling section waste gas main pipe 4, a secondary cooling section waste gas branch pipe I7 is arranged on the secondary cooling section waste gas main pipe 4 in front of the auxiliary heating device 5, the other end of the secondary cooling section waste gas branch pipe I7 is connected to a blast drying section waste gas pipeline 2 at the inlet of a furnace cover dust remover 3, and an adjusting valve I8 is arranged on the secondary cooling section waste gas branch pipe I7; a secondary cooling section waste gas branch pipe II 9 is arranged on the secondary cooling section waste gas main pipe 4 behind the auxiliary heat supply device 5, and the other end of the secondary cooling section waste gas branch pipe II 9 is connected with the side surface of the chain grate machine preheating section upper cover;
and a regenerative air branch pipe II 11 is arranged on the regenerative air main pipe 6, the regenerative air branch pipe II 11 is connected with the two cold section waste gas branch pipes II 9, and an adjusting valve II 12 is arranged on the regenerative air branch pipe II 11.
Furthermore, the return air branch pipe II 11 is communicated with a secondary cooling section waste gas branch pipe II 9 connected to the front part of the preheating section upper cover through a conical reducer pipe 13.
The temperature adjusting method of the chain grate machine upper cover hot air system comprises the methods of adjusting the temperature of the blast drying waste gas of the chain grate machine, supplementing heat of the waste gas of the second cooling section and adjusting the temperature of the air flow in the preheating first section upper cover,
1) the temperature of the forced air drying waste gas of the chain grate machine is adjusted
Waste gas in an upper cover 1-1 of a forced air drying section of the chain grate machine goes to a furnace cover dust remover 3 through a waste gas pipeline 2 of the forced air drying section, when the temperature of the forced air drying waste gas is lower than an expected value, an adjusting valve I8 on a waste gas branch pipe I7 of a secondary cooling section is opened, hot waste gas in a waste gas main pipe 4 of the secondary cooling section enters the waste gas pipeline 2 of the forced air drying section through the waste gas branch pipe I7 of the secondary cooling section, and the temperature of mixed gas entering the furnace cover dust remover 3 is enabled to reach the expected value by adjusting and controlling the opening degree of the adjusting valve I8;
2) the secondary cooling section waste gas concurrent heating
When the temperature of the waste gas of the second cooling section is lower and can not meet the requirement of the first preheating section, the auxiliary heating device 5 arranged on the waste gas main pipe 4 of the second cooling section supplements heat, so that the temperature of the waste gas of the second cooling section is increased, and the temperature requirement of the first preheating section on a heat source is met;
3) the temperature of the air flow in the preheating section of the upper cover is adjusted
Hot waste gas from the upper cover of the second cold section of the circular cooler passes through a waste gas main pipe 4 of the second cold section and is connected with two side surfaces of the upper cover 1-3 of the preheating section of the chain grate machine through a waste gas branch pipe II 9 of the second cold section, a regenerative air main pipe 6 is connected with the waste gas branch pipe II 9 of the second cold section through a regenerative air branch pipe II 11, the opening degree of an adjusting valve II 12 arranged on a hot air return branch pipe II 11 is adjusted to adjust the amount of return air mixed into the waste gas of the second cooling section, so that two air flows are mixed in a waste gas branch pipe II 9, the mixed gas enters the preheating section upper cover 1-3 from two side surfaces of the preheating section upper cover 1-3 of the chain grate machine, the temperature of the mixed gas is in accordance with the expected value by controlling the proportion of the two gas flows in each two-cold-section waste gas branch pipe II 9, by the method, the temperature of the airflow entering different parts in the preheating section of the upper cover 1-3 is controlled, so that the temperature rising process of the pellets in the preheating section is controllable.
The utility model connects the backheating air branch pipe II 11 on the two cold section waste gas branch pipe II 9, the backheating air is added into the two cold section waste gas, and the mixed gas temperature entering the preheating section upper cover 1-3 is between the temperature of the backheating air and the temperature of the two cold section waste gas (350-800 ℃), through the mixing of the high and low temperature air flows;
the utility model mixes air in the waste gas branch pipe I9 at the second cooling section, and then enters the chain grate machine from the side to preheat the upper cover 1-3 at the first section, so that the temperature of the transverse hot air in the upper cover 1-3 at the first section preheated by the chain grate machine is uniform;
the utility model discloses a two strands of air current proportions in II 12 aperture controls of governing valve, adjust each two cold section waste gas branch pipes II 9, make the air current temperature that gets into the chain grate machine and preheat one section upper shield 1-3 adjustable, can control the chain grate machine and preheat fore-and-aft temperature variation gradient in one section upper shield 1-3, it is controllable to make the pelletizing preheat one section intensification process, avoid the temperature to rise suddenly, prevent the green ball fracture, ensure the drying of pelletizing on chain grate machine 1, preheat the effect, improve chain grate machine 1 to the adaptability of raw materials.
Claims (2)
1. A hot air system of an upper cover of a chain grate machine comprises the chain grate machine, an upper cover of the chain grate machine, a blast drying section waste gas pipeline, a furnace cover dust remover, a secondary cooling section waste gas pipeline, a back heating air pipeline and a regulating valve; the chain grate machine upper cover is sequentially divided into an air blowing drying section upper cover, an air draft drying section upper cover, a preheating section upper cover and a preheating section upper cover along the moving direction of the chain grate machine; one end of the waste gas pipeline of the blast drying section is connected with the upper cover of the blast drying section, the other end of the waste gas pipeline of the blast drying section is connected with the inlet of the furnace cover dust remover, and the furnace cover dust remover is communicated with the atmosphere; the upper cover of the air draft drying section is connected with a regenerative air main pipe through a regenerative air branch pipe I,
the method is characterized in that: an auxiliary heating device is arranged on a secondary cooling section waste gas main pipe, a secondary cooling section waste gas branch pipe I is arranged on the secondary cooling section waste gas main pipe in front of the auxiliary heating device, the other end of the secondary cooling section waste gas branch pipe I is connected to a blast drying section waste gas pipeline at a furnace cover dust removal inlet, and an adjusting valve I is arranged on the secondary cooling section waste gas branch pipe I; a second cold section waste gas branch pipe II is arranged on a second cold section waste gas main pipe behind the auxiliary heat supply device, and the other end of the second cold section waste gas branch pipe II is connected with the side surface of the chain grate machine preheating section upper cover;
and a regenerative air branch pipe II is arranged on the regenerative air main pipe and is connected with the two cold section waste gas branch pipes II, and an adjusting valve II is arranged on the regenerative air branch pipe II.
2. The chain grate machine upper cover hot air system as claimed in claim 1, wherein the return hot air branch pipes II are respectively communicated with two cold section waste gas branch pipes II connected to the front part of the preheating section upper cover through tapered reducer pipes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920840723.0U CN210036269U (en) | 2019-06-05 | 2019-06-05 | Chain grate machine upper cover hot air system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920840723.0U CN210036269U (en) | 2019-06-05 | 2019-06-05 | Chain grate machine upper cover hot air system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210036269U true CN210036269U (en) | 2020-02-07 |
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ID=69346697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920840723.0U Withdrawn - After Issue CN210036269U (en) | 2019-06-05 | 2019-06-05 | Chain grate machine upper cover hot air system |
Country Status (1)
| Country | Link |
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| CN (1) | CN210036269U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110068225A (en) * | 2019-06-05 | 2019-07-30 | 中冶北方（大连）工程技术有限公司 | A kind of grate upper cover hot-air system and temperature control method |
| CN112066731A (en) * | 2020-09-25 | 2020-12-11 | 中冶北方（大连）工程技术有限公司 | Hot air system of chain grate machine |
-
2019
- 2019-06-05 CN CN201920840723.0U patent/CN210036269U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110068225A (en) * | 2019-06-05 | 2019-07-30 | 中冶北方（大连）工程技术有限公司 | A kind of grate upper cover hot-air system and temperature control method |
| CN110068225B (en) * | 2019-06-05 | 2024-03-29 | 中冶北方（大连）工程技术有限公司 | Hot air system of upper cover of chain grate machine and temperature adjusting method |
| CN112066731A (en) * | 2020-09-25 | 2020-12-11 | 中冶北方（大连）工程技术有限公司 | Hot air system of chain grate machine |
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