CN219083708U - Air blowing system of dry section of belt type roasting machine - Google Patents
Air blowing system of dry section of belt type roasting machine Download PDFInfo
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- CN219083708U CN219083708U CN202223137878.9U CN202223137878U CN219083708U CN 219083708 U CN219083708 U CN 219083708U CN 202223137878 U CN202223137878 U CN 202223137878U CN 219083708 U CN219083708 U CN 219083708U
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Abstract
The utility model relates to a belt roasting machine drum drying section wind system and a control method, comprising a belt roasting machine and a drum drying fan, and is characterized in that: the belt type roasting machine further comprises a cold section return air pipeline, a dry section waste gas pipeline, a dry section end upper cover, a dry section end bellows, a dry section dust removing pipeline and an air mixing device, wherein the cold section return air pipeline of the belt type roasting machine is connected with the dry section waste gas pipeline through a regulating valve I, the dry section end upper cover is connected with the dry section dust removing pipeline through a regulating valve II, the dry section end bellows is connected with the dry section dust removing pipeline through a regulating valve III, the cold section return air pipeline is connected with the dry section dust removing pipeline through a regulating valve IV, the dry section dust removing pipeline is connected with the air mixing device, an air inlet of the air mixing device is connected with an upper cover of a cooling second section of the belt type roasting machine, and an air outlet of the air mixing device is connected with a dry air blower through a blower. The utility model reasonably utilizes the waste heat of the waste gas in the system, thereby achieving the purposes of reducing the environmental protection load and reducing the corrosion of equipment and pipelines.
Description
Technical Field
The utility model belongs to the technical field of iron ore pellet production, and particularly relates to a dry section air system of a belt roasting machine.
Background
At present, the belt type roasting machine process is one of main production processes of iron ore pellets, the traditional hot air flow process is to divide the belt type roasting machine into seven functional areas according to the trend of air flow and the functions of equipment, the upper cover is divided into seven sections, and the bellows is divided into four groups. The corresponding functional areas of the seven-section upper cover are respectively a drying section, a pumping section, a preheating section, a roasting section, a soaking section, a cooling section and a cooling section along the advancing direction of the material flow, so that the requirements of the functional areas on the medium temperature are met, and the sources of the air flows entering each section are different.
Bellows groups are associated with each section of the upper shroud, specifically configured as follows:
1) The first group of air boxes corresponds to the dry blowing section, air flows from the dry blowing fan, enters the air boxes, passes through the material layer from bottom to top and enters the upper cover, performs primary drying on green pellets, and the waste gas of the upper cover of the dry blowing section is discharged into the atmosphere after dust removal;
2) The second group of bellows corresponds to the front parts of the pumping section, the preheating section and the roasting section, the air flows come from the regenerative fan and the cooling section respectively, the heat supply devices at the two sides of the upper cover of the roasting section can heat the air flows entering the upper cover, the air flows with different temperatures enter the upper cover and then pass through the material layer from top to bottom to enter the bellows, the raw balls are further heated after the dehydration process is completed, and enter the roasting section, and all the flue gas of each bellows of the second group is discharged into the atmosphere after being collected by an external exhaust system;
3) The third group of air boxes correspond to the rear part of the roasting section and the soaking section, the air flows come from a cooling section, the heat supply devices at two sides of the upper cover of the roasting section can heat the air flows entering the upper cover, the air flows with different temperatures enter the air boxes from top to bottom after entering the upper cover, the air flows penetrate through the material layers and enter the air boxes from top to bottom, the pellets are insulated for a certain period of time after the roasting process is completed, the flue gas of each air box of the third group is collected and then used as 'hot air', the hot air returns to the upper cover of the belt roasting machine through the backheating fan, one part of the flue gas enters the upper cover of the pumping section and is used as a pumping medium, the other part of the flue gas enters the upper cover of the preheating section, and the temperature of the gas in the upper cover of the preheating section is regulated according to production requirements;
4) The fourth group of bellows corresponds to the first cooling section and the second cooling section, air flow is from a cooling fan, and normal-temperature air passes through the material layer from bottom to top and enters the upper cover from the bellows to cool the pellets. The waste gas of the upper cover of the cooling section goes to two, the high-temperature waste gas at the front part directly enters the soaking section material layer, the waste gas at the rear part enters the roasting section and the upper cover of the preheating section through the backheating air pipe, and the waste gas of the upper cover of the cooling section goes to the drum drying fan to be used as a heat exchange medium of the drum drying section.
By adopting the traditional wind flow, the following problems exist in actual production:
1) The 'regenerative air' entering the upper cover of the drying section is flue gas of the rear part of the roasting section and the soaking section, wherein sulfur oxides and nitrogen oxides are contained in the flue gas, and in the actual production process, if the pressure in the upper cover of the drying section is lower than the pressure in the upper cover of the drying section, the 'regenerative air' enters the upper cover of the drying section from a gap between a partition wall of the upper cover and a material layer, and the sulfur oxides and the nitrogen oxides are mixed into the water-containing waste gas of the drying section, so that the concentration of sulfur dioxide and the concentration of the nitrogen oxides in the waste gas of the drying section exceed the standard, and on the other hand, the water and the sulfur trioxide in the waste gas of the drying section form dilute sulfuric acid, so that equipment and pipelines can be corroded;
2) In order to prevent equipment and pipelines from being corroded due to condensation of the water-containing waste gas in the dry-blowing section, a common method is to arrange a hot air exchanging pipeline on the waste gas pipeline in the dry-blowing section, and connect the hot air exchanging pipeline with a backheating fan or an outlet pipeline of the dry-blowing fan, wherein 'backheating air' from the backheating fan is exchanged to bring in sulfur oxide and nitrogen oxide, and the waste gas in the triple-cooling section from the dry-blowing fan is exchanged to cause larger specification of waste gas dust removing facilities and high investment and operation cost due to lower temperature;
3) When the negative pressure is applied to the upper cover of the drum drying section, cold air can enter the cover from the end part of the upper cover of the drum drying section, so that the temperature of waste gas of the drum drying section is reduced, and the risk of condensation is increased; when the pressure in the upper cover of the drum drying section is positive, water-containing dust-containing waste gas can overflow;
4) Positive pressure is arranged in the air box of the dry section of the air drum, and hot air overflows from the end part of the air box.
Therefore, it is necessary to optimize the blowing and drying section wind system of the belt roasting machine, and by adding a control means, waste gas and waste heat in the system are reasonably utilized, so as to achieve the purposes of reducing environmental protection load, reducing equipment and pipeline corrosion, reducing production cost and improving equipment utilization rate.
Disclosure of Invention
The utility model aims to provide a blowing and drying section wind system of a belt type roasting machine, which is used for adjusting the temperature of a blowing and drying section wind box and upper cover waste gas and preventing dust-containing gas from overflowing to damage the environment.
The utility model aims at realizing the following technical scheme:
the utility model relates to a dry blowing section air system of a belt type roasting machine, which comprises a belt type roasting machine and a belt type roasting machine air box, wherein the belt type roasting machine is divided into a dry blowing section, a dry pumping section, a preheating section, a roasting section, a soaking section, a cooling section and a cooling section along the material flow direction; the method is characterized in that: the belt type roasting machine further comprises a cold section return air pipeline, a dry section waste gas pipeline, a dry section end upper cover, a dry section end bellows, a dry section dust removing pipeline and an air mixing device, wherein the cold section return air pipeline of the belt type roasting machine is connected with the dry section waste gas pipeline through a regulating valve I, the dry section end upper cover is connected with the dry section dust removing pipeline through a regulating valve II, the dry section end bellows is connected with the dry section dust removing pipeline through a regulating valve III, the cold section return air pipeline is connected with the dry section dust removing pipeline through a regulating valve IV, the dry section dust removing pipeline is connected with the air mixing device, an air inlet of the air mixing device is connected with an upper cover of a cooling second section of the belt type roasting machine, and an air outlet of the air mixing device is connected with a dry air blower through a blower.
Further, a temperature detection device I is arranged on the exhaust gas pipeline of the dry section of the belt roasting machine 1.
Further, a pressure detection device I is arranged on the upper cover of the end part of the drum drying section of the belt roasting machine 1.
Further, a pressure detection device II is arranged on an air box at the end part of the dry section of the belt roasting machine 1.
Further, a temperature detection device II is arranged on an outlet pipeline of the drum drying fan of the belt roasting machine 1.
Further, the dry section wind system of the belt roasting machine further comprises an automatic control system, wherein the automatic control system is connected with the temperature detection device I, the temperature detection device II, the pressure detection device I and the pressure detection device II and controls the regulating valve I, the regulating valve II, the regulating valve III, the regulating valve IV and the wind door of the wind machine.
Compared with the prior art, the utility model has the advantages that:
1) The return air of the first cooling section and the exhaust gas of the dry section are generally free of sulfur oxides and nitrogen oxides, the return air temperature of the first cooling section is high, and the return air temperature of the first cooling section is mixed with the exhaust gas of the upper cover of the dry section;
2) The upper cover at the end part of the dry section and the bellows at the end part of the dry section are arranged and connected with the inlet of the dry blower through the dust removing pipeline of the dry section, and the part of waste gas is not discharged, so that the post environment can be improved, and the environmental dust removing load is not increased;
3) The exhaust gas temperature in the air box of the dry blowing section can be accurately controlled by adjusting the proportion of the exhaust gas of the second cooling section, the return air of the first cooling section and the exhaust gas from the upper cover of the end part of the dry blowing section and the air box of the end part of the dry blowing section.
Drawings
FIG. 1 is a schematic diagram of a dry blowing section wind system of a belt roasting machine.
Detailed Description
The utility model is further described below with reference to the drawings and examples.
As shown in FIG. 1, the air blowing system of the belt type roasting machine comprises a belt type roasting machine and a belt type roasting machine air box, wherein the belt type roasting machine is divided into a blowing-drying section, a pumping-drying section, a preheating section, a roasting section, a soaking section, a cooling section and a cooling section along the material flow direction, the belt type roasting machine air box is divided into five groups of air boxes, the first group of air boxes correspond to the blowing-drying section, the preheating section and the front part of the roasting section, the second group of air boxes correspond to the pumping-drying section, the preheating section and the front part of the roasting section, the third group of air boxes correspond to the middle part of the roasting section, the rear part of the roasting section and the soaking section, the fourth group of air boxes correspond to the front part of the cooling section, and the fifth group of air boxes correspond to the rear part of the cooling section and the cooling section. The method is characterized in that: the belt type roasting machine further comprises a cold section return air pipeline 2, a dry section waste gas pipeline 3, an upper cover 4 at the end part of the dry section, an air box 5 at the end part of the dry section, a dry section dust removal pipeline 6 and an air mixing device 7, wherein the cold section return air pipeline 2 of the belt type roasting machine 1 is connected with the dry section waste gas pipeline 3 through a regulating valve I3-1, and a temperature detection device I3-2 is arranged on the dry section waste gas pipeline 3 of the belt type roasting machine 1;
the upper cover 4 at the end part of the dry blowing section is connected with the dust removing pipeline 6 of the dry blowing section through a regulating valve II 6-1, the bellows 5 at the end part of the dry blowing section is connected with the dust removing pipeline 6 of the dry blowing section through a regulating valve III 6-2, the return air pipeline 2 of a cold section is connected with the dust removing pipeline 6 of the dry blowing section through a regulating valve IV 6-3, the dust removing pipeline 6 of the dry blowing section is connected with a wind mixing device 7, the wind inlet of the wind mixing device 7 is connected with the upper cover of the cooling two sections of the belt roasting machine 1, and the wind outlet of the wind mixing device 7 is connected with a dry blowing fan 8 through a fan air door 8-1.
The utility model is characterized in that a pressure detection device I4-1 is arranged on an upper cover 4 at the end part of a dry section of a belt roasting machine 1, a pressure detection device II 5-1 is arranged on an air box 5 at the end part of the dry section of the belt roasting machine 1, and a temperature detection device II 8-2 is arranged on an outlet pipeline of a dry air blower 8 of the belt roasting machine 1.
The utility model also provides an automatic control system for the dry section wind blowing system of the belt roasting machine, which is connected with the temperature detection device I3-2, the temperature detection device II 8-2, the pressure detection device I4-1 and the pressure detection device II 5-1, and controls the regulating valve I3-1, the regulating valve II 6-1, the regulating valve III 6-2, the regulating valve IV 6-3 and the fan air door 8-1. The automatic control system adopted by the utility model can use the existing control technology, and is not described in detail herein.
The control method of the dry section wind system of the belt type roasting machine comprises the following steps:
s1, setting a temperature value in a dry section exhaust gas pipeline 3, when a temperature detection device I3-2 monitors that the temperature in the dry section exhaust gas pipeline 3 is lower than a set value, opening a regulating valve I, and when the value of the temperature detection device I is higher than the set value, closing the regulating valve I, so that the temperature of exhaust gas entering a dust remover is always kept above a dew point, and equipment and pipelines are prevented from being corroded due to dew formation of water-containing exhaust gas;
s2, setting a pressure value in the upper cover 4 at the end part of the drum drying section, when the pressure detection device I4-1 monitors that the pressure in the upper cover 4 at the end part of the drum drying section is lower than a set value, closing the regulating valve II 6-1, and when the value of the pressure detection device I4-1 is higher than the set value, opening the regulating valve II 6-1; the pressure in the upper cover at the end part of the drum drying section is kept to be a set value, so that waste gas overflow caused by pressure fluctuation in the upper cover of the drum drying section is avoided, the post environment is improved, and the environmental dust removal load is not increased;
s3, setting a pressure value in the air box 5 at the end part of the dry blowing section, when the pressure detection device II 5-1 monitors that the pressure in the air box 5 at the end part of the dry blowing section is lower than a set value, closing a regulating valve III 6-2, when the value of the pressure detection device II 5-1 is higher than the set value, opening a regulating valve III 6-3, keeping the pressure in the air box at the end part of the dry blowing section as the set value, avoiding overflow of waste gas at the end part of the air box at the dry blowing section, improving the post environment, and not increasing the environmental dust removal load;
s4, setting a temperature value in an outlet pipeline of the drum dryer 8, when the temperature detection device II 8-2 monitors that the temperature in the outlet pipeline of the drum dryer 8 is lower than a set value, opening the regulating valve IV 6-3, and when the value of the temperature detection device II 8-2 is higher than the set value, closing the regulating valve IV 6-3, so that the air temperature of the drum dryer section can be accurately controlled.
By adopting the blowing section wind system of the belt type roasting machine, the temperature of the blowing section wind box and the upper cover waste gas can be flexibly adjusted by reasonably planning the trend of the air flow and controlling the proportion of the air flow by using the valve, and the environment can be effectively prevented from being damaged by the overflow of the dust-containing gas by arranging the upper cover at the end part of the blowing section and the wind box at the end part of the blowing section. Meanwhile, the discharge capacity of waste gas can be reduced, the environmental protection load is reduced, the corrosion of equipment and pipelines is reduced, the production cost is reduced, and the equipment utilization rate is improved.
Claims (3)
1. The belt type roasting machine air blowing and drying section air system comprises a belt type roasting machine and a belt type roasting machine air box, wherein the belt type roasting machine is divided into a blowing and drying section, a pumping section, a preheating section, a roasting section, a soaking section, a cooling section and a cooling section along the material flow direction, the belt type roasting machine air box is divided into five groups of air boxes, the first group of air boxes correspond to the blowing and drying section, the second group of air boxes correspond to the pumping section, the preheating section and the front part of the roasting section, the third group of air boxes correspond to the middle part of the roasting section, the rear part of the roasting section and the soaking section, the fourth group of air boxes correspond to the front part of the cooling section, and the fifth group of air boxes correspond to the rear part of the cooling section and the cooling section; the method is characterized in that: the belt type roasting machine further comprises a cold section return air pipeline, a dry section waste gas pipeline, a dry section end upper cover, a dry section end bellows, a dry section dust removing pipeline and an air mixing device, wherein the cold section return air pipeline of the belt type roasting machine is connected with the dry section waste gas pipeline through a regulating valve I, the dry section end upper cover is connected with the dry section dust removing pipeline through a regulating valve II, the dry section end bellows is connected with the dry section dust removing pipeline through a regulating valve III, the cold section return air pipeline is connected with the dry section dust removing pipeline through a regulating valve IV, the dry section dust removing pipeline is connected with the air mixing device, an air inlet of the air mixing device is connected with an upper cover of a cooling second section of the belt type roasting machine, and an air outlet of the air mixing device is connected with a dry air blower through a blower.
2. The dry section wind system of the belt roasting machine according to claim 1, wherein a temperature detection device I is arranged on a dry section exhaust gas pipeline of the belt roasting machine; the upper cover at the end part of the dry section of the belt roasting machine is provided with a pressure detection device I; the pressure detection device II is arranged on the bellows at the end part of the dry section of the belt type roasting machine; and a temperature detection device II is arranged on an outlet pipeline of the belt type roasting machine drum dryer.
3. The dry section wind system of the belt roasting machine according to claim 2, further comprising an automatic control system, wherein the automatic control system is connected with the temperature detecting device I, the temperature detecting device II, the pressure detecting device I and the pressure detecting device II and controls the regulating valve I, the regulating valve II, the regulating valve III, the regulating valve IV and the wind machine air door.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223137878.9U CN219083708U (en) | 2022-11-25 | 2022-11-25 | Air blowing system of dry section of belt type roasting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223137878.9U CN219083708U (en) | 2022-11-25 | 2022-11-25 | Air blowing system of dry section of belt type roasting machine |
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| Publication Number | Publication Date |
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| CN219083708U true CN219083708U (en) | 2023-05-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223137878.9U Active CN219083708U (en) | 2022-11-25 | 2022-11-25 | Air blowing system of dry section of belt type roasting machine |
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|---|---|
| CN (1) | CN219083708U (en) |
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- 2022-11-25 CN CN202223137878.9U patent/CN219083708U/en active Active
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