CN213924953U - Dry flue gas of concentrate system of recycling - Google Patents
Dry flue gas of concentrate system of recycling Download PDFInfo
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- CN213924953U CN213924953U CN202021629020.2U CN202021629020U CN213924953U CN 213924953 U CN213924953 U CN 213924953U CN 202021629020 U CN202021629020 U CN 202021629020U CN 213924953 U CN213924953 U CN 213924953U
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Abstract
The utility model discloses a dry flue gas of concentrate system of recycling, include: the induced draft pipe is communicated with a flue gas outlet of the concentrate drying system; the induced draft fan and the dust remover are arranged on the induced draft pipe, and the induced draft fan is used for guiding the waste gas flowing out of the flue gas outlet to an air box inlet of a preset drying section of the circular cooler; the air inlet end of the main air supply pipe of the circular cooler is provided with a main fan; and the air outlet end of the confluence air pipe is connected with the inlet of the air box, and the air inlet end is communicated with the induced air pipe and the main air supply pipe of the circular cooler. The low-temperature waste gas of the dryer of the concentrate drying system is introduced into the air box inlet of the preset drying section of the circular cooler to cool the pellets without being discharged outside, so that the total emission of gas pollutants is reduced, and the air consumption in production is reduced.
Description
Technical Field
The utility model relates to an environmental protection technology field especially relates to a dry flue gas of concentrate system of recycling.
Background
In smelting plants, steel processing plants and the like, grate-rotary kiln-circular cooler pelletizing processes are commonly used. Referring to fig. 1, in the production process of the grate-rotary kiln-circular cooler pellet process, the grate 11 is divided into a first drying section 111, a second drying section 112, a transition preheating section 113 and a preheating section 114 according to the sequence of heat exchange between flue gas and pellets; the pellets preheated by the grate 11 enter the rotary kiln 12 for roasting, and the pellets after roasting enter the annular cooler 13 for cooling; the cooling process of the circular cooler 13 is divided into a cooling first section 131, a cooling second section 1320 and a cooling third section 133, and the cooled pellets meet the requirements of transportation and storage. The hot gas after each stage of heat exchange in the cooling process of the circular cooler 13 is reused, as shown in fig. 1, the temperature of the gas in the cooling stage 131 is the highest, the reverse stream enters the rotary kiln 12 to participate in roasting, the hot waste gas after roasting enters the preheating stage 114 of the chain grate 11, and the green pellets are guided to the drying stage 112 for drying through the dust remover 14 and the heat return fan 15 after being preheated; the gas in the cooling second section 132 enters the transition preheating section 113 to further reduce the moisture of the pellets; the waste gas of the transition preheating section 113 and the waste gas of the drying second section 112 are led to the main dust collector 16 uniformly, and the dust falls, then enters the desulfurization and denitrification device 18 through the main exhaust fan 17, and is discharged through the main chimney 19 after the flue gas treatment reaches the standard. The cooling three-stage 133 gas enters the drying one-stage 111 to dry the green pellets, and the dried exhaust gas passes through the drying dust collector 101 and the drying exhaust fan 102 and is exhausted from the chimney 19.
Meanwhile, in the treatment process of the ore concentrate, for example, in the pelletizing process of the iron ore concentrate, because the water content of the iron ore concentrate raw material is often higher, the iron ore concentrate raw material needs to be dried before pelletizing, and the water content of the iron ore concentrate is reduced to a proper range, so that the pelletizing effect and the green pellet strength can be ensured in the subsequent flow. The equipment commonly used for drying is hot blast stoves, bag houses and drum dryers. Referring to fig. 2, taking a drum dryer as an example, the high-temperature exhaust gas of the hot blast stove 21 enters the drum from the head of the drum dryer 22, the iron ore concentrate with high water content in the drum rolls with the drum, the water content is reduced after exchanging heat with the high-temperature exhaust gas, the exhaust gas after heat exchange is discharged from the tail of the drum, the low-temperature exhaust gas is introduced into the bag type dust collector 41, and the low-temperature exhaust gas is discharged through the induced draft fan 42 and the chimney (not numbered in the figure) after dust filtration.
However, in the grate-rotary kiln-circular cooler pelletizing process and the iron concentrate drying air flow system process, various waste gas discharging and purifying devices can be generated; the drying of iron ore concentrate needs the hot-blast utilization of certain temperature, and the exhaust waste gas of while usually need to cool down the back just can carry out SOx/NOx control, has both caused the waste of equipment, also does not obtain the utilization of maximize.
In view of the above, there is a need to design a new recycling system for the concentrate drying flue gas to solve the above technical problems.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main aim at provides a new dry flue gas of concentrate system of recycling, aims at solving foretell technical problem.
In order to realize the above-mentioned purpose, the utility model provides a dry flue gas of concentrate system of recycling, include:
the induced draft pipe is communicated with a flue gas outlet of the concentrate drying system;
the induced draft fan and the dust remover are arranged on the induced draft pipe, and the induced draft fan is used for guiding the waste gas flowing out of the flue gas outlet to an air box inlet of a preset drying section of the circular cooler;
the air inlet end of the main air supply pipe of the circular cooler is provided with a main fan;
and the air outlet end of the confluence air pipe is connected with the inlet of the air box, and the air inlet end is communicated with the induced air pipe and the main air supply pipe of the circular cooler.
Further, the preset drying section is a drying second section of the circular cooler.
And the three-way control valve is provided with an outlet and an inlet, the outlet of the three-way control valve is communicated with the confluence air pipe, and two inlets of the three-way control valve are respectively connected with the induced air pipe and the main air supply pipe of the circular cooler.
Furthermore, the induced air pipe and the main air supply pipe of the circular cooler are respectively provided with a control valve.
Further, the induced draft fan is a frequency conversion induced draft fan.
Furthermore, the main fan is a high-power fan or a fan set consisting of a plurality of variable-frequency fans.
Further, the dust remover is a multi-tube dust remover.
In the utility model, the low-temperature waste gas of the dryer of the concentrate drying system is introduced into the bellows inlet of the preset drying section of the circular cooler through the concentrate drying flue gas recycling system, and the hot waste gas of the concentrate drying system is not directly discharged to cool pellets without being discharged outside, so that the total discharge amount of gas pollutants is reduced, and the air consumption in production is reduced; if the fuel used by the hot blast stove of the concentrate drying system contains sulfide, the sulfur-containing gas is concentrated to the desulfurization system for treatment after the waste gas is recycled, and the independent treatment is not needed, so that the investment is saved; in the prior art, the concentrate drying waste gas is directly discharged, and a high-temperature bag-type dust remover with good filtering effect is needed for removing dust; after dust-containing waste gas of the concentrate drying flue gas recycling system is filtered through a ring cooling material layer, the waste gas enters transitional preheating, the dust content is reduced through the filtering function of a material layer twice, and finally the waste gas is treated by an electric dust collector, so that the investment and the occupied area of a bag-type dust collector are reduced; compared with the prior art, after the bag-type dust remover is cancelled, corresponding facilities such as a dust recovery system and a chimney are also cancelled, so that the investment and the occupied area are saved, and the equipment maintenance amount is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic diagram of a process structure of a grate-rotary kiln-circular cooler pelletizing in the prior art;
fig. 2 is a schematic structural diagram of an iron concentrate drying air flow system in the prior art;
fig. 3 is the structure schematic diagram of the concentrate drying flue gas recycling system of the present invention.
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
Please refer to fig. 3, which is a schematic structural diagram of a concentrate drying flue gas recycling system (not shown) according to the present invention. The concentrate drying flue gas recycling system is used for recycling hot waste gas of the concentrate drying air flow system.
Concentrate drying flue gas system of recycling includes: an induced draft duct 32, an induced draft fan 331, a dust remover 332, a main blast duct 34 of the circular cooler, a main fan 35 and a confluent air duct 36.
Wherein, the induced draft tube 32 is communicated with a flue gas outlet 221 of the dryer 22 of the concentrate drying system; the induced draft fan 331 and the dust collector 332 are arranged on the induced draft pipe 32, and the induced draft fan 331 is used for guiding the exhaust gas flowing out from the flue gas outlet 221 to an air box inlet (not shown) of a preset drying section of the circular cooler 13; the main air supply pipe 34 of the circular cooler is used for conveying cooling air to an inlet of the air box, and a main fan 35 is arranged at an air inlet end of the main air supply pipe 34 of the circular cooler; the air outlet end (not shown) of the confluent air pipe 36 is connected with the inlet of the air box, and the air inlet end (not shown) is communicated with the induced air pipe 32 and the main air supply pipe 34 of the circular cooler.
In this embodiment, the cooling process of the circular cooler 13 is divided into a cooling section 131, a cooling section 1320 and a cooling section 133, and the cooled pellets meet the requirements of transportation and storage. The preset drying section is a drying second section 132 of the circular cooler 13. Because the ring cooling hot air needs to participate in roasting and green ball preheating, the hot air with lower oxygen content can have adverse effect on the two processes, and the recycling effect is common; the green pellets are dried by the hot air in the ring cooling three sections, the water content of low-temperature waste gas after concentrate drying is high, the green pellets are not favorably dried, and the recycling effect is general; therefore, in this embodiment, the low-temperature exhaust gas after drying the iron ore concentrate is introduced into the drying section 132 of the circular cooler 13 to replace a part or all of the air originally provided by the external blower, and the high-temperature exhaust gas after heat exchange is introduced into the transition preheating section of the grate for use. It is to be understood that the above is not a limitation of the preset drying section.
In the embodiment, the low-temperature waste gas of the dryer 22 of the concentrate drying system is introduced into the air box inlet of the preset drying section of the circular cooler 13, and as the hot waste gas of the concentrate drying system is not directly discharged, pellet cooling is performed without discharging, so that the total discharge amount of gas pollutants is reduced, and the air consumption in production is reduced; if the fuel used by the hot blast stove of the concentrate drying system contains sulfide, the sulfur-containing gas is concentrated to the desulfurization system for treatment after the waste gas is recycled, and the independent treatment is not needed, so that the investment is saved; in the prior art, the concentrate drying waste gas is directly discharged, and a high-temperature bag-type dust remover with good filtering effect is needed for removing dust; after dust-containing waste gas of the concentrate drying flue gas recycling system is filtered through a ring cooling material layer, the waste gas enters transitional preheating, the dust content is reduced through the filtering function of a material layer twice, and finally the waste gas is treated by an electric dust collector, so that the investment and the occupied area of a bag-type dust collector are reduced; compared with the prior art, after the bag-type dust remover is cancelled, corresponding facilities such as a dust recovery system and a chimney are also cancelled, so that the investment and the occupied area are saved, and the equipment maintenance amount is reduced.
Furthermore, the induced draft pipe 32 and the main air supply pipe 34 of the circular cooler are respectively provided with a control valve 37. The control valve 37 can be adjusted, and when the waste gas can completely meet the secondary cooling air volume of the circular cooler, the control valve 37 corresponding to the main air supply pipe 34 of the circular cooler is closed; when the waste gas only partially meets the cooling air quantity of the drying second section 132 of the circular cooler 13, the two control valves 37 are adjusted to be opened, and meanwhile, the main fan 35 is started to operate as required to supplement partial air quantity. Considering that the water content of the iron ore concentrate meets the requirement of pellet production, when drying is not needed, the hot blast stove and the cylindrical dryer stop working, the control valve 37 corresponding to the induced draft tube 32 is closed, the induced draft fan 331 stops running, the drying system and the cooling system are cut off, the control valve 37 corresponding to the main air supply pipe 34 of the cold machine is opened, the main air fan 35 is used for cooling pellets, and normal production cannot be influenced.
Alternatively, in another embodiment, the effect of two control valves 37 can also be achieved by providing a one-out-two-in three-way control valve (not shown). The outlet of the three-way control valve is communicated with a confluent air pipe 36, and the two inlets of the three-way control valve are respectively connected with the induced air pipe 32 and the main air supply pipe 34 of the circular cooler.
Preferably, the induced draft fan 331 may be a variable frequency induced draft fan. The main fan 35 may be a high-power fan or a fan group composed of a plurality of variable frequency fans. Thereby realizing the adjustment of wind power.
Preferably, the dust remover 332 is a multi-tube dust remover.
The above is only the preferred embodiment of the present invention, and not the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings or the direct or indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims (7)
1. A concentrate drying flue gas recycling system is characterized by comprising:
the induced draft pipe is communicated with a flue gas outlet of the concentrate drying system;
the induced draft fan and the dust remover are arranged on the induced draft pipe, and the induced draft fan is used for guiding the waste gas flowing out of the flue gas outlet to an air box inlet of a preset drying section of the circular cooler;
the air inlet end of the main air supply pipe of the circular cooler is provided with a main fan;
and the air outlet end of the confluence air pipe is connected with the inlet of the air box, and the air inlet end is communicated with the induced air pipe and the main air supply pipe of the circular cooler.
2. The concentrate drying flue gas recycling system according to claim 1, wherein the preset drying section is a drying second section of the circular cooler.
3. The concentrate drying flue gas recycling system according to claim 1, further comprising a three-way control valve with two inlets and two outlets, wherein an outlet of the three-way control valve is communicated with the confluence air pipe, and two inlets of the three-way control valve are respectively connected with the induced air pipe and the main air supply pipe of the circular cooler.
4. The concentrate drying flue gas recycling system according to claim 1, wherein the induced draft tube and the main air supply tube of the circular cooler are respectively provided with a control valve.
5. The concentrate drying flue gas recycling system according to any of claims 1 to 4, wherein the induced draft fan is a variable frequency induced draft fan.
6. The concentrate drying flue gas recycling system according to any of claims 1 to 4, wherein the main fan is a fan unit consisting of a plurality of variable frequency fans.
7. A concentrate drying flue gas recycling system according to any of claims 1-4, characterized in that the dust separator is a multi-tube dust separator.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021629020.2U CN213924953U (en) | 2020-08-07 | 2020-08-07 | Dry flue gas of concentrate system of recycling |
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| CN202021629020.2U CN213924953U (en) | 2020-08-07 | 2020-08-07 | Dry flue gas of concentrate system of recycling |
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| CN213924953U true CN213924953U (en) | 2021-08-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113865294A (en) * | 2021-09-27 | 2021-12-31 | 攀钢集团攀枝花钢铁研究院有限公司 | Induced air drying method for titanium concentrate |
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113865294A (en) * | 2021-09-27 | 2021-12-31 | 攀钢集团攀枝花钢铁研究院有限公司 | Induced air drying method for titanium concentrate |
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