CN112066731B - Hot air system of chain grate machine - Google Patents
Hot air system of chain grate machine Download PDFInfo
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- CN112066731B CN112066731B CN202011019320.3A CN202011019320A CN112066731B CN 112066731 B CN112066731 B CN 112066731B CN 202011019320 A CN202011019320 A CN 202011019320A CN 112066731 B CN112066731 B CN 112066731B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
Abstract
The invention relates to a hot air system of a chain grate machine, which comprises the chain grate machine, an upper cover, an air box, a hot air pipeline and a kiln tail cover, and is characterized in that: the chain grate machine upper cover is divided into an air blowing drying section, an air draft drying section, a transition section, a preheating front section and a preheating rear section; the air boxes are divided into a blowing dry air box, an outer discharging air box, a backheating air box I and a backheating air box II, the blowing dry air box corresponds to a blowing dry section, the outer discharging air box corresponds to an exhausting dry section and a transition section, the backheating air box I corresponds to a preheating front section, the backheating air box II corresponds to a preheating rear section, and hot smoke collected by the backheating air box I is sent to an upper cover of the exhausting dry section by the backheating fan I; hot flue gas collected by the heat recovery air box II is sent to the upper cover of the transition section by the heat recovery fan II; the preheating front section upper cover is connected with the secondary cooling section waste gas pipeline. The invention has the advantages that: the thermal regulation of the chain grate machine can be adjusted according to the actual raw material conditions, and the requirements of producing different types of pellet ores are met.
Description
Technical Field
The invention belongs to the technical field of iron ore pellet production, and particularly relates to a hot air system of a chain grate machine.
Background
At present, the process of a chain grate machine, a rotary kiln and a circular cooler is one of the main production processes for producing iron ore pellets, the traditional hot air flow is to divide the chain grate machine into three chambers (groups) and four sections, and the upper cover of the chain grate machine is sequentially divided into the four sections according to the temperature of hot air flow and the mode of passing through a material layer: a forced air drying section, an air draft drying section, a preheating section and a preheating section; the chain grate machine air boxes corresponding to the four sections of upper covers of the chain grate machine are divided into three groups according to the trend of hot air flow: the first group of air boxes correspond to the forced air drying section, receive cooling waste gas from the upper cover of the third cooling section of the circular cooler and are used as a medium for forced air drying; the second group of bellows corresponds to the air draft drying section and the preheating section, and the flue gas in the air draft drying section and the preheating section is collected and then enters an exhaust system, and is exhausted into the atmosphere after being treated; the third group of bellows corresponds to the preheating second section, and hot flue gas of the preheating second section is collected and then returns to the upper cover of the air draft drying section after being processed by the back heating air system to be used as a medium for air draft drying.
The blast drying section is the first process of treating pellets on a chain grate, the heat source for blast drying is cooling waste gas from the upper cover of the three cold sections of the circular cooler, and hot air flow (generally about 200 ℃) passes through a pellet (wet pellets, hereinafter referred to as green pellets) material layer from bottom to top to primarily remove moisture of the green pellets.
The air draft drying section is a second process for treating pellets on the chain grate, the heat source for air draft drying is hot flue gas (hereinafter referred to as 'hot air') from a chain grate heat return fan, hot air (generally 300-400 ℃) passes through the green pellet material layer from top to bottom, moisture of the green pellets is continuously removed, and the temperature of the air flow serving as the air draft drying heat source is determined according to a pellet test. After heat exchange, the waste gas enters the second group of wind boxes and is collected into an external discharge system.
The preheating section is a transition link on a chain grate machine, the preheating section has a heat source of hot waste gas (hereinafter referred to as "secondary cooling section waste gas") from an upper cover of a secondary cooling section of the circular cooler, hot gas flow (generally about 700 ℃) passes through a pellet material layer from top to bottom, residual moisture of green pellets is completely removed, and the pellets (dry pellets) are heated to be heated as required. After heat exchange, the waste gas enters the second group of wind boxes and is collected into an external discharge system.
The preheating second stage is the last process for treating pellets on a chain grate, the end part of an upper cover of the preheating second stage is directly communicated with a kiln tail cover, hot flue gas from a rotary kiln enters the upper cover of the preheating second stage through the kiln tail cover, hot air (generally 850-1050 ℃) penetrates through a dry pellet material layer from top to bottom, the 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 return hot air (generally about 500 ℃), and the return hot air is fed into an upper cover of an air draft drying stage to be used as a heat source after being mixed with cold air.
The traditional grate hot air system is designed according to specific raw material conditions, the length of each section of the grate is fixed, and the retention time of pellets in each section is fixed after a production line is built. Under different raw material conditions, the green pellets have great differences in proper moisture, green pellet bursting temperature, preheating temperature and preheating time, and in the production process, the heat, drying temperature and retention time required in the green pellet drying stage also have great differences. When the drying stage needs less heat and short drying time, and the preheating stage needs more heat and long preheating time, the regenerative air from the preheating second stage section exceeds the requirement of the air draft drying section, and according to the air flow, the air balance cannot be established, so that more flue gas is discharged with a large amount of heat, the energy waste is caused, and the environmental protection pressure is increased.
Chinese patent 201820418408.4 discloses a "grate hot air system", which is divided into a front preheating section and a rear preheating section, the flue gas of the two preheating sections is respectively sent to an upper cover of an air draft drying section and an upper cover of a front preheating section, the upper cover of the rear preheating section still receives the waste gas of the two cooling sections, and the flue gas of the two preheating sections and the flue gas of the rear preheating sections are respectively utilized from the perspective of regenerative air utilization, which is more reasonable than the traditional hot air flow. However, hot air flows (generally 850-1050 ℃) entering upper covers of the front preheating section and the rear preheating section come from the rotary kiln, and the front preheating section and the rear preheating section can only be used as the preheating sections, so that the lengths of the sections of the chain grate machine are still fixed, the retention time of pellets in the drying and preheating stages is relatively fixed, and the raw material adaptability is still not ideal.
Therefore, in order to adapt to increasingly complex pellet raw material conditions, optimize the hot air flow of the chain grate machine, desalt the boundary between the preheating section one and the preheating section two of the chain grate machine and improve the flexibility of a thermal engineering system, the hot air flow is very necessary.
Disclosure of Invention
The invention aims to provide a hot air system of a chain grate machine, which is characterized in that a transition section is added on the chain grate machine, so that the thermal regulation of the chain grate machine is variable, the hot air system can adapt to different green ball drying and preheating time, the heat carried by hot air flow is fully recycled, and the discharged flue gas amount is reduced.
The purpose of the invention is realized by the following technical scheme:
the invention relates to a hot air system of a chain grate machine, which comprises the chain grate machine, an upper cover of the chain grate machine arranged above the chain grate machine, an air box arranged at the lower part of the chain grate machine, a hot air pipeline and a kiln tail cover, and is characterized in that: the chain grate machine upper cover is divided into an air blowing drying section, an air draft drying section, a transition section, a preheating front section and a preheating rear section; the air boxes are divided into a dry blowing air box, an outer discharging air box, a heat returning air box I and a heat returning air box II, the dry blowing air box is arranged corresponding to a dry blowing section and is connected with a cooling waste gas pipeline from an upper cover of a three-cold section of the circular cooler, the outer discharging air box is arranged corresponding to a dry suction section and a transition section, the outer discharging air box is communicated with an air exhaust flue, and the air exhaust flue is connected with an outer discharging system; the other end of the first hot air return flue is communicated with an air draft drying section of the upper cover of the chain grate machine through a hot air return pipeline I; a regenerative fan I is arranged on the regenerative air pipeline I; the other end of the second back hot air flue is communicated with the transition section of the upper cover of the chain grate machine through the back hot air pipeline II; a regenerative fan II is arranged on the regenerative air pipeline II;
the waste gas pipeline of the upper cover of the blast drying section is connected with a furnace cover dust remover; the preheating front section upper cover is connected with the secondary cooling section waste gas pipeline, and the preheating rear section upper cover is connected with the kiln tail cover.
Furthermore, a pipeline heating furnace I and an air charging valve are arranged on the heat return air pipeline II.
Furthermore, a pipeline heating furnace II is arranged on the two-cold-section waste gas pipeline.
Furthermore, an auxiliary heating device is arranged on the kiln tail cover.
Compared with the prior art, the invention has the advantages that: the invention has the advantages that the transition section of the chain grate machine is arranged, the trend of hot air flow is re-planned, and a flexible auxiliary heating means is adopted, so that the thermal regulation of the chain grate machine can be adjusted according to specific raw material conditions, and the requirements of producing different types of pellet ores can be met.
The main body is as follows:
1) a pipeline heating furnace I is arranged on a regenerative air pipeline connected with the transition section, so that the temperature of hot air entering the upper cover of the transition section is controllable, the temperature can be controlled below the burst temperature of green pellets, the transition section is used as an air draft drying section, the temperature can be raised through the pipeline heating furnace, and the transition section is used as a preheating section in a traditional hot air system;
2) the pipeline heating furnace II is arranged on the waste gas pipeline of the second cold section connected with the preheating front section, so that the temperature of hot air entering the upper cover of the preheating front section is controllable, when the temperature control is low, the preheating front section can play a role of preheating the first section in the traditional hot air system, and when the temperature control is high, the preheating front section can play a role of preheating the second section in the traditional hot air system;
3) the waste gas of the second cooling section firstly enters the preheating front section as a heat source for preheating the dry balls and then enters the air draft drying section in the form of hot return air as a drying heat source, so that the waste heat of the waste gas of the second cooling section can be more fully utilized, and the external discharge of the waste gas can be reduced.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
The invention relates to a hot air system of a chain grate machine, which comprises a chain grate machine 1, an upper cover of the chain grate machine arranged above the chain grate machine, an air box arranged at the lower part of the chain grate machine, a hot air pipeline and a kiln tail cover, and is characterized in that: the chain grate machine upper cover is divided into an air blowing drying section 2-1, an air draft drying section 2-2, a transition section 2-3, a preheating front section 2-4 and a preheating rear section 2-5; the air boxes are divided into a dry air blowing box 3-1, an outer discharging air box 3-2, a heat returning air box I3-3 and a heat returning air box II 3-4, the dry air blowing box 3-1 is arranged corresponding to the air blowing drying section 2-1, is connected with a cooling waste gas pipeline 9 from the upper cover of the three cold sections of the circular cooler, receives cooling waste gas from the upper cover of the three cold sections of the circular cooler and is used as a heat source for air blowing drying; the exhaust air box 3-2 is arranged corresponding to the exhaust air drying section 2-2 and the transition section 2-3, smoke of the exhaust air drying section 2-2 and the transition section 2-3 is collected, the exhaust air box 3-2 is communicated with the exhaust flue 321, the exhaust flue 321 is connected with an exhaust system, and the smoke of the exhaust air box 3-2 is collected and then sent to the exhaust system through the exhaust flue 321, and is exhausted into the atmosphere after being processed.
The heat return air box I3-3 is arranged corresponding to the preheating front section 2-4 and is communicated with the first heat return air flue 331, and the other end of the first heat return air flue 331 is communicated with the air draft drying section 2-2 of the chain grate upper cover through a heat return air pipeline I332; a regenerative fan I333 is arranged on the regenerative air pipeline I332;
the heat recovery air box I3-3 collects hot flue gas of the preheating front section 2-4, the temperature of the collected flue gas is generally 300-400 ℃, and the collected flue gas is sent to the upper cover of the air draft drying section 2-2 through the heat recovery fan I333 and the heat recovery air pipeline I332 to be used as a heat source for air draft drying.
The heat return air box II 3-4 is arranged corresponding to the preheating rear section 2-5 and is communicated with a second heat return air flue 341, and the other end of the second heat return air flue 341 is communicated with a transition section 2-3 of an upper cover of the chain grate machine through a heat return air pipeline II 342; a regenerative fan II 343 is arranged on the regenerative air duct II 342;
the regenerative air box II 3-4 collects hot flue gas of the preheated rear section 2-5, the temperature of the collected flue gas is generally 500-600 ℃, and the collected flue gas is sent to the upper cover of the transition section 2-3 by the regenerative air fan II 343 and the regenerative air pipeline II 342 to be used as a heat source of the transition area.
A pipeline heating furnace I344 and an air adding valve 345 are arranged on a regenerative air pipeline II 342, hot air entering the upper cover of the transition section 2-3 can be heated up through heat supplement of the pipeline heating furnace I344, the temperature of the hot air entering the upper cover of the transition section is controllable, the temperature of the hot air entering the upper cover of the transition section 2-3 is increased from 500-600 ℃ to about 700 ℃ through heat supplement of the pipeline heating furnace I344, and the transition section 2-3 can be used as a preheating section in a traditional hot air system. Or a small amount of cold air can be added through the air adding valve 345, the temperature of the hot air entering the upper cover of the transition section 2-3 is reduced from 500-600 ℃ to below 400 ℃, the transition section 2-3 can also be used as an air draft drying section in the traditional hot air system, under the condition, the preheating front section 2-4 is used as a preheating section in the traditional hot air system, and the preheating rear section 2-5 is used as a preheating section in the traditional hot air system.
The upper cover of the preheating front section 2-4 is connected with a second cold section waste gas pipeline 10, and a pipeline heating furnace II 101 is arranged on the second cold section waste gas pipeline 10; the upper cover of the preheating rear section 2-5 is connected with a kiln tail cover 7, an auxiliary heating device 8 is arranged on the kiln tail cover 7, and hot air in the rotary kiln enters the upper cover of the preheating rear section 2-5 through the kiln tail cover 7.
The hot air entering the preheating front section 2-4 can be heated up by the heat compensation of the pipeline heating furnace II 101, the temperature of the hot air entering the upper cover of the preheating front section 2-4 is raised to be above 850 ℃, and the hot air entering the preheating rear section 2-5 can be heated up by the heat compensation of the auxiliary heating device 8 arranged on the kiln tail cover 7. In this case, the preheating front section 2-4 and the preheating rear section 2-5 can be used as the preheating second section in the traditional hot air system.
The waste gas pipeline 211 of the upper cover of the blast drying section 2-1 is connected with a furnace cover dust remover, and the waste gas of the upper cover of the blast drying section 2-1 is discharged after dust removal.
The invention has the advantages that the transition section of the chain grate machine is arranged, the trend of hot air flow is re-planned, a flexible auxiliary heating means is adopted, the length of the induced draft drying section and the preheating section of the chain grate machine is variable by controlling the temperature of air flow entering the upper cover of the chain grate machine, and in the actual production, a thermal engineering system can be adjusted according to specific raw material conditions, so that the requirements of producing different types of pellet ores can be met.
Claims (1)
1. The utility model provides a chain grate machine hot air system, includes the chain grate machine, sets up the chain grate machine upper shield in chain grate machine top, sets up bellows, hot-blast duct and kiln tail cover in the chain grate machine lower part, its characterized in that: the chain grate machine upper cover is divided into an air blowing drying section, an air draft drying section, a transition section, a preheating front section and a preheating rear section; the air boxes are divided into a dry blowing air box, an outer discharging air box, a heat returning air box I and a heat returning air box II, the dry blowing air box is arranged corresponding to a dry blowing section and is connected with a cooling waste gas pipeline from an upper cover of a three-cold section of the circular cooler, the outer discharging air box is arranged corresponding to a dry suction section and a transition section, the outer discharging air box is communicated with an air exhaust flue, and the air exhaust flue is connected with an outer discharging system; the other end of the first hot air return flue is communicated with an air draft drying section of the upper cover of the chain grate machine through a hot air return pipeline I; a regenerative fan I is arranged on the regenerative air pipeline I; the other end of the second back hot air flue is communicated with the transition section of the upper cover of the chain grate machine through the back hot air pipeline II; a regenerative fan II is arranged on the regenerative air pipeline II;
the waste gas pipeline of the upper cover of the blast drying section is connected with a furnace cover dust remover; the preheating front section upper cover is connected with the secondary cooling section waste gas pipeline, and the preheating rear section upper cover is connected with the kiln tail cover;
a pipeline heating furnace I and an air charging valve are arranged on the heat return air pipeline II; hot air entering the upper cover of the transition section is heated up through the heat compensation of the pipeline heating furnace I, so that the temperature of the hot air entering the upper cover of the transition section is controllable, the temperature of the hot air entering the upper cover of the transition section is increased from 500-600 ℃ to 700 ℃ through the heat compensation of the pipeline heating furnace I, and the transition section is used as a preheating section in a traditional hot air system; or adding cold air through an air adding valve, reducing the temperature of the hot air entering the transition section cover from 500-600 ℃ to below 400 ℃, using the transition section as an air draft drying section in the traditional hot air system, using the preheating front section as a preheating section in the traditional hot air system, and using the preheating rear section as a preheating section in the traditional hot air system;
a pipeline heating furnace II is arranged on the secondary cooling section waste gas pipeline; and an auxiliary heating device is arranged on the kiln tail cover.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011019320.3A CN112066731B (en) | 2020-09-25 | 2020-09-25 | Hot air system of chain grate machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011019320.3A CN112066731B (en) | 2020-09-25 | 2020-09-25 | Hot air system of chain grate machine |
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| CN112066731A CN112066731A (en) | 2020-12-11 |
| CN112066731B true CN112066731B (en) | 2022-05-27 |
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| CN202011019320.3A Active CN112066731B (en) | 2020-09-25 | 2020-09-25 | Hot air system of chain grate machine |
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Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1079962A (en) * | 1976-10-15 | 1980-06-24 | Roland Drugge | Method of sintering and apparatus for carrying out the method |
| JP2010024477A (en) * | 2008-07-16 | 2010-02-04 | Kobe Steel Ltd | Method for producing iron ore pellet |
| CN102121786B (en) * | 2011-03-08 | 2012-03-28 | 中冶北方工程技术有限公司 | Hot air system of grate-rotary kiln-circular cooler |
| CN204806887U (en) * | 2015-06-24 | 2015-11-25 | 洛阳矿山机械工程设计研究院有限责任公司 | Hot air system with adjustable drying grate |
| CN105135900A (en) * | 2015-08-12 | 2015-12-09 | 中冶长天国际工程有限责任公司 | Method and device for controlling temperature of outlet of circular cooler |
| CN207991270U (en) * | 2018-03-27 | 2018-10-19 | 中冶北方（大连）工程技术有限公司 | Grate hot-air system |
| CN210036269U (en) * | 2019-06-05 | 2020-02-07 | 中冶北方（大连）工程技术有限公司 | Chain grate machine upper cover hot air system |
| CN210030833U (en) * | 2019-06-05 | 2020-02-07 | 中冶北方（大连）工程技术有限公司 | Pellet cooling waste gas recycling system |
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2020
- 2020-09-25 CN CN202011019320.3A patent/CN112066731B/en active Active
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