CN219014945U - Step air supply system for dry section of belt roasting machine - Google Patents
Step air supply system for dry section of belt roasting machine Download PDFInfo
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- CN219014945U CN219014945U CN202223137877.4U CN202223137877U CN219014945U CN 219014945 U CN219014945 U CN 219014945U CN 202223137877 U CN202223137877 U CN 202223137877U CN 219014945 U CN219014945 U CN 219014945U
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Abstract
The utility model relates to a step air supply system of a dry section of a belt roasting machine, which comprises a belt roasting machine, an upper cover, an air box, a dust remover, a cooling exhaust fan, a dry air box, an upper cover air taking opening and an air mixing device, wherein an air box air outlet of the exhaust cooling section is connected with an inlet of the cooling exhaust fan through the dust remover, an air outlet of the cooling exhaust fan is connected with an air inlet of the dry air box I, and an air outlet of the dry air box I is connected with a plurality of groups of air supply branch pipes I, air supply regulating valves I and the air mixing device through an air supply main pipe I; the upper cover air taking port I is connected with the air taking main pipe through the air taking regulating valve I, the upper cover air taking port II is connected with the air taking main pipe through the air taking regulating valve II, the air taking main pipe is connected with the air inlet of the dry air blower II, the air outlet of the dry air blower II is connected with the air mixing device, and the air mixing device is connected with the air box of the dry air blowing section. Through controlling the exhaust gas proportion from different positions of the cooling section, the step air supply in the forced air drying process can be realized, the heat supply efficiency is improved, and the green pellet drying effect is improved.
Description
Technical Field
The utility model belongs to the technical field of iron ore pellet production, and particularly relates to a step air supply system for a dry section 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.
In actual production, there may be a large difference in thermal system of green pellets drying process when different raw materials are used, and the following problems may exist when the above-mentioned conventional wind flow is adopted:
1) The source of the air for the forced air drying is single, the cooling air quantity of the cooling second section is inversely proportional to the temperature of the waste gas, and the temperature and the flow of the air for the forced air drying are difficult to ensure to meet the requirements in the actual production process;
2) The temperature of the air for forced air drying is single, the air temperature blown in by each bellows is lower than the burst temperature of the initial moisture of the green pellets, and the heat supply efficiency is low.
Therefore, a regulation and control means is necessary to be additionally arranged, the requirement of the forced air drying section on a drying medium is met, the green pellet drying effect is ensured, and the utilization rate of the belt type roasting machine is improved.
Disclosure of Invention
The utility model aims to provide a stepped air supply system of a drying section of a belt type roasting machine, which can ensure the air quantity for air drying and the air flow temperature in each air box of the drying section according to the requirement by controlling the proportion of waste gas from different parts of a cooling section.
The utility model aims at realizing the following technical scheme:
the utility model relates to a step air supply system of a dry blowing section of a belt type roasting machine, which comprises the belt type roasting machine, an upper cover and an air box, wherein the belt type roasting machine is divided into a dry blowing section, an air extracting section, a preheating section, a roasting section, a soaking section and a cooling section along the material flow direction; the method is characterized in that: the air box air outlet of the air draft cooling section is connected with an inlet of the cooling exhaust fan through a connecting pipe by the dust remover and a fan air door I, an air outlet of the cooling exhaust fan is connected with an air inlet of the air trunk fan I through the fan air door II, and an air outlet of the air trunk fan I is connected with a plurality of groups of air supply branch pipes I, air supply regulating valves I and the air mixing device through an air supply main pipe I; the upper cover air taking port I and the upper cover air taking port II are arranged on the side face of the upper cover of the blast cooling section, the upper cover air taking port I is connected with an air taking main pipe through an air taking regulating valve I, the upper cover air taking port II is connected with the air taking main pipe I through an air taking regulating valve II, the air taking main pipe 11 is connected with an air inlet of a dry blast blower II through a fan air door III, an air outlet of the dry blast blower II is connected with a mixing device through an air supply main pipe II and an air supply branch pipe II, and the mixing device is connected with an air box of the dry blast section through an air box branch pipe of the dry blast section.
Further, a temperature detection device I is arranged on the blast trunk branch pipe.
Further, a temperature detection device II is arranged on the wind taking main pipe.
Further, the step air supply system at the dry section of the belt roasting machine drum further comprises a control system, wherein the control system is connected with the temperature detection device I and the temperature detection device II and controls the fan air door I, the fan air door II, the fan air door III, the air supply regulating valve I, the air supply regulating valve II, the air taking regulating valve I and the air taking regulating valve II.
Compared with the prior art, the utility model has the advantages that:
1) The exhaust gas from the cooling exhaust fan, the upper cover air taking port I and the upper cover air taking port II are taken from different positions of the cooling section, the temperatures of the three exhaust gases are different, and the requirements of blast drying on air quantity and temperature can be simultaneously met by controlling the proportion of the exhaust gas from different positions of the cooling section;
2) By arranging the air mixing device at the branch pipe of the air box of the air drying section, the air supply quantity and the air supply temperature of each air box can be flexibly controlled, and the temperature of a drying medium can be gradually increased along with the reduction of the moisture of the green pellets, so that the heat supply intensity in the air drying process is controllable, and the raw material adaptability of the belt roasting machine 1 is improved.
Drawings
FIG. 1 is a schematic diagram of a step air supply system of a dry section of a belt roasting machine.
Detailed Description
The utility model is further described below with reference to the drawings and examples.
As shown in figure 1, the stepped air supply system for the dry blowing section of the belt type roasting machine comprises a belt type roasting machine 1, an upper cover and an air box, wherein the belt type roasting machine 1 is divided into a dry blowing section, an air extracting section, a preheating section, a roasting section, a soaking section and a cooling section along the material flow direction, the cooling section is divided into an air blowing cooling section and an air extracting cooling section, the air box is provided with five groups of air boxes, the first group of air boxes corresponds to the dry blowing section, the second group of air boxes corresponds to the air extracting section, the preheating section and the front part of the roasting section, the third group of air boxes corresponds 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 corresponds to the air blowing cooling section, and the fifth group of air boxes corresponds to the air extracting cooling section; the method is characterized in that: the air box air outlet of the air draft cooling section is connected with the inlet of the cooling exhaust fan 4 through the dust remover 3 and the fan air door I4-1 by connecting pipes, the air outlet of the cooling exhaust fan 4 is connected with the air inlet of the air blower I5 through the fan air door II 2-1, and the air outlet of the air blower I5 is connected with a plurality of groups of air supply branch pipes I6-1, the air supply regulating valves I6-2 and the air mixing device 14 by the air supply main pipe I6; the upper cover air taking opening I7 and the upper cover air taking opening II 8 are arranged on the side face of the upper cover of the blast cooling section, the upper cover air taking opening I7 is connected with the air taking main pipe 11 through the air taking adjusting valve I9, the upper cover air taking opening II 8 is connected with the air taking main pipe I11 through the air taking adjusting valve II 10, the air taking main pipe 11 is connected with the air inlet of the dry blast fan II 12 through the fan air door III 12-1, the air outlet of the dry blast fan II 12 is connected with the air mixing device 14 through the air supply main pipe II 13 and the air supply branch pipe II 13-1 air supply adjusting valve II 13-2, and the air mixing device 14 is connected with the air blast of the dry blast section through the air blast branch pipe 15 of the dry blast section.
The utility model is provided with a temperature detection device I15-1 on the dry section bellows branch pipe 15 for monitoring the temperature in the dry section bellows branch pipe 15 in real time.
According to the utility model, the air taking main pipe 11 is provided with the temperature detection device II 16 for monitoring the temperature in the air taking main pipe 11 in real time.
The utility model further comprises an automatic control system which is connected with the temperature detection device I15-1 and the temperature detection device II 16 and controls the fan air door I4-1, the fan air door II 5-1, the fan air door III 12-1, the air supply regulating valve I6-2, the air supply regulating valve II 13-2, the air taking regulating valve I9 and the air taking regulating valve II 10.
The working method of the step air supply system of the dry section of the belt type roasting machine provided by the utility model is as follows:
s1, setting a temperature value in a dry-blowing section bellows branch pipe 15, closing an air supply regulating valve I6-2 when the value of a temperature detection device I15-1 on the dry-blowing section bellows branch pipe is lower than a set value, and opening an air supply regulating valve II 13-2; when the value of the temperature detection device I15-1 on the dry section bellows branch pipe 15 is higher than a set value, opening the air supply regulating valve I6-2, and closing the air supply regulating valve II 13-2;
the air mixing device 14 is connected to each dry section bellows branch pipe 15 respectively, through the control mode, the air flow proportion from the dry air blower I5 and the dry air blower II 12 can be adjusted, the air inlet temperature of each dry section bellows can be independently controlled, in the actual production process, the temperature in each dry section bellows branch pipe 15 can be set to be different values, the air flow temperature entering each bellows of the dry section can be changed in a gradient manner, and the temperature of a drying medium can be gradually increased along with the reduction of green pellet moisture, so that the heating strength in the blast drying process is controllable, and the raw material adaptability of the belt roasting machine 1 is improved.
S2, setting a temperature value in the air taking main pipe 11, closing the air taking regulating valve I9 and opening the air taking regulating valve II 10 when the value of the temperature detection device II 16 on the air taking main pipe 11 is lower than a set value; when the value of the temperature detection device II 16 on the air taking main pipe 11 is higher than a set value, the air taking regulating valve I9 is opened, and meanwhile the air taking regulating valve II 10 is closed. By means of this control, the proportion of the exhaust gases taken from the upper hood of the forced air drying section can be flexibly adjusted, so that the exhaust gas temperature in the mixed air intake manifold 11 reaches a set value, which determines the air supply temperature of the forced air drying blower ii 12.
By adopting the cascade air supply system of the drying section of the belt type roasting machine, the air flow temperature in each bellows of the drying section of the belt type roasting machine can be precisely controlled according to the needs on the basis of ensuring the air quantity for drying of the belt type roasting machine by controlling the proportion of waste gas from different parts of the cooling section, so that cascade heat supply can be realized in the drying process of the belt type roasting machine, the heat supply efficiency of the drying section of the belt type roasting machine is improved, the drying effect of green pellets is improved, and the utilization rate of equipment is improved.
The utility model can be used for newly-built projects, can be transformed in the original pellet production line, and is convenient to popularize.
Claims (3)
1. The step air supply system of the dry blowing section of the belt type roasting machine comprises a belt type roasting machine, an upper cover and an air box, wherein the belt type roasting machine is divided into a dry blowing section, an air extraction section, a preheating section, a roasting section, a soaking section and a cooling section along the material flow direction, the cooling section is divided into an air blowing cooling section and an air extraction cooling section, the air box is five groups of air boxes, the first group of air boxes corresponds to the dry blowing section, the second group of air boxes corresponds to the air extraction section, the preheating section and the front part of the roasting section, the third group of air boxes corresponds 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 corresponds to the air blowing cooling section, and the fifth group of air boxes corresponds to the air extraction cooling section; the method is characterized in that: the air box air outlet of the air draft cooling section is connected with an inlet of the cooling exhaust fan through a connecting pipe by the dust remover and a fan air door I, an air outlet of the cooling exhaust fan is connected with an air inlet of the air trunk fan I through the fan air door II, and an air outlet of the air trunk fan I is connected with a plurality of groups of air supply branch pipes I, air supply regulating valves I and the air mixing device through an air supply main pipe I; the upper cover air taking port I and the upper cover air taking port II are arranged on the side face of the upper cover of the blast cooling section, the upper cover air taking port I is connected with an air taking main pipe through an air taking regulating valve I, the upper cover air taking port II is connected with the air taking main pipe through an air taking regulating valve II, the air taking main pipe is connected with an air inlet of a dry blast fan II through a fan air door III, an air outlet of the dry blast fan II is connected with a wind mixing device through an air supply main pipe II and an air supply branch pipe II, and the wind mixing device is connected with a wind box of the dry blast section through a wind box branch pipe of the dry blast section.
2. The belt roasting machine dry section cascade air supply system of claim 1, wherein: a temperature detection device I is arranged on the air box branch pipe of the dry blowing section; and a temperature detection device II is arranged on the wind taking main pipe.
3. The belt roasting machine dry section cascade air supply system of claim 2, wherein: the intelligent air conditioner further comprises a control system, wherein the control system is connected with the temperature detection device I and the temperature detection device II and controls the fan air door I, the fan air door II, the fan air door III, the air supply regulating valve I, the air supply regulating valve II, the air taking regulating valve I and the air taking regulating valve II.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223137877.4U CN219014945U (en) | 2022-11-25 | 2022-11-25 | Step air supply system for dry section of belt roasting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223137877.4U CN219014945U (en) | 2022-11-25 | 2022-11-25 | Step air supply system for dry section of belt roasting machine |
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| Publication Number | Publication Date |
|---|---|
| CN219014945U true CN219014945U (en) | 2023-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223137877.4U Active CN219014945U (en) | 2022-11-25 | 2022-11-25 | Step air supply system for dry section of belt roasting machine |
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| Country | Link |
|---|---|
| CN (1) | CN219014945U (en) |
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- 2022-11-25 CN CN202223137877.4U patent/CN219014945U/en active Active
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