CN213932088U - Waste gas recycling system of chain grate machine - Google Patents
Waste gas recycling system of chain grate machine Download PDFInfo
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- CN213932088U CN213932088U CN202021630188.5U CN202021630188U CN213932088U CN 213932088 U CN213932088 U CN 213932088U CN 202021630188 U CN202021630188 U CN 202021630188U CN 213932088 U CN213932088 U CN 213932088U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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Abstract
The utility model discloses a waste gas recycling system of drying grate, include: an induced draft pipe communicated with an air outlet of a preset preheating section of the chain grate; the first induced draft fan is communicated with the induced draft pipe and used for guiding the waste gas flowing out of the air outlet of the preset preheating section to the air inlet of the limestone ore grinding system; the exhaust pipe is communicated with an exhaust outlet of the limestone grinding system; and the flue gas purification equipment is connected between the chimney and the exhaust pipe. The waste gas of the transition preheating section of the chain grate is introduced into a limestone ore grinding system, and a hot blast stove and an exhaust chimney do not need to be separately configured, so that the investment and the operation cost are reduced; meanwhile, the temperature of the flue gas returned by the limestone grinding system for desulfurization and denitrification is reduced, so that desulfurization is facilitated; effectively utilizes the waste heat of the hot waste gas of the chain grate, is beneficial to environmental protection and achieves the aims of energy conservation and consumption reduction.
Description
Technical Field
The utility model relates to an environmental protection technology field especially relates to a waste gas recycling system of drying grate.
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, due to the requirement of producing the fluxing pellet, limestone is added as a raw material for adjusting the alkalinity before pelletizing. The limestone is usually ground to below a certain particle size by a limestone grinding system to meet the production requirements. Referring to fig. 2, the exhaust gas from the hot-air furnace 21 enters the equipment of the mill 30 from the air inlet of the mill 30, and after contacting the ground limestone material, the exhaust gas is subjected to heat exchange to remove moisture, and the fine powder meeting the particle size requirement is taken out of the mill 30, and after passing through the bag-type dust collector 31, the finished limestone powder is captured on a cloth bag, and after ash removal, the finished limestone powder is transported to a batching bin (not shown) through the pneumatic transport unit 320 for a subsequent batching process. The exhaust gas satisfying the emission requirements is discharged from a stack (not numbered) through the induced draft fan 41.
However, in the grate-rotary kiln-circular cooler pelletizing process and the limestone grinding system process, various exhaust emission and purification devices may occur; limestone grinding system needs the hot-blast utilization of uniform temperature, and the exhaust waste gas of grate machine can carry out SOx/NOx control after need cooling usually, 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 exhaust gas recycling system for a chain grate machine to solve the above technical problems.
SUMMERY OF THE UTILITY MODEL
The main object of the present invention is to provide a new waste gas recycling system for a drying grate, which is aimed at solving the above-mentioned technical problem.
In order to achieve the above object, the present invention provides a waste gas recycling system of a chain grate, comprising:
an induced draft pipe communicated with an air outlet of a preset preheating section of the chain grate;
the first induced draft fan is communicated with the induced draft pipe and used for guiding the waste gas flowing out of the air outlet of the preset preheating section to the air inlet of the limestone ore grinding system;
the exhaust pipe is communicated with an exhaust outlet of the limestone grinding system;
and the flue gas purification equipment is connected between the chimney and the exhaust pipe.
Further, the preset preheating section is a transition preheating section of the chain grate.
Further, the induced draft pipe is also directly communicated with the flue gas purification equipment through a first flow division pipe; a three-way control valve is further arranged between the induced draft pipe and the first induced draft fan, an inlet of the three-way control valve is communicated with the induced draft pipe, and two outlets of the three-way control valve are respectively communicated with the first shunt pipe and the second shunt pipe; and the second shunt pipe is communicated with the first induced draft fan.
Further, still be provided with first dust remover and second draught fan on the first reposition of redundant personnel, the second draught fan is used for with the gas drainage in the first reposition of redundant personnel extremely gas cleaning equipment.
Further, a multi-pipe dust remover is further arranged on the second shunt pipe.
Further, the exhaust gas discharge port of the chain grate is communicated with the first shunt pipe.
Further, the first induced draft fan is a variable frequency induced draft fan.
Further, still be provided with the third draught fan on the exhaust pipe, be used for with the gas drainage of exhaust pipe extremely gas cleaning equipment.
Further, the third induced draft fan is a variable frequency induced draft fan.
Further, the flue gas purification equipment is desulfurization and denitrification purification equipment.
In the embodiment, the waste gas of the preset preheating section of the chain grate is introduced into the limestone grinding system through the waste gas recycling system of the chain grate, and a hot blast stove and an exhaust chimney do not need to be separately configured for the limestone grinding system, so that the investment and the operation cost are reduced; meanwhile, the temperature of the flue gas returned by the limestone grinding system for desulfurization and denitrification is reduced, so that desulfurization is facilitated; effectively utilizes the waste heat of the hot waste gas of the chain grate, is beneficial to environmental protection and achieves the aims of energy conservation and consumption reduction.
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 diagram of a limestone grinding system of the prior art;
fig. 3 is a schematic structural view of the waste gas recycling system of the drying grate 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.
Referring to fig. 3, there is shown a schematic structural diagram of a waste gas recycling system (not shown) with a chain grate according to the present invention.
The waste gas recycling system is used for recycling hot waste gas of the chain grate 31 in the pelletizing process of the chain grate-rotary kiln-circular cooler. Specifically, the drying grate 31 is divided into a drying section 311, a drying section 312, a transition preheating section 313 and a preheating section 314 according to the sequence of heat exchange between the flue gas and the pellets; in this embodiment, the exhaust gas from the transition preheating section 313 is preferably reused, and the exhaust gas from the preheating section 314 is used for drying in the drying section 312. It is understood that in other embodiments, the exhaust gas recycling system may be used to recover and recycle exhaust gas from one or more of the drying section 311, the drying section 312, the transition preheating section 313, and the preheating section 314.
After the materials in the transition preheating section 313 are dried by the first drying section 311 and the second drying section 312, the waste gas is low in water content and the preheating content is generally not enough to support drying and preheating of the grate 31 again, and meanwhile, the waste gas in the transition preheating section 313 is introduced into a waste gas recycling system after being directly discharged and cooled.
The exhaust gas recycling system of the grate comprises an induced draft pipe 320, a first induced draft fan 331, an exhaust pipe 34 and a flue gas purification device 35.
Wherein, the induced air duct 320 is communicated with an air outlet (not shown) of a preset preheating section (such as the transition preheating section 313) of the chain grate 31; the first induced draft fan 331 is communicated with the induced draft pipe 320, and is configured to guide the exhaust gas flowing out from the air outlet of the preset preheating section to an air inlet (not shown) of the limestone grinding system 40. The exhaust duct 34 is communicated with an exhaust outlet (not shown) of the limestone grinding system 40, and exhaust gas exhausted from the limestone grinding system 40 is purified by the flue gas purification device 35 connected between the chimney 50 and the exhaust duct 34, and then exhausted through the chimney 50.
In the embodiment, the waste gas of the transition preheating section of the grate 31 is introduced into the limestone grinding system 40, and a hot blast stove and an exhaust chimney do not need to be separately configured for the limestone grinding system 40, so that the investment and operation cost are reduced; meanwhile, the temperature of the flue gas returned by the limestone grinding system 40 for desulfurization and denitrification is reduced, which is beneficial to desulfurization; effectively utilizes the waste heat of the hot waste gas of the chain grate machine 31, is beneficial to environmental protection and achieves the aims of energy conservation and consumption reduction.
Further, the induced draft pipe 320 is also directly communicated with the flue gas purification equipment 35 through the first shunt pipe 321; a three-way control valve 36 is further arranged between the induced draft pipe 320 and the first induced draft fan 331, an inlet (not shown) of the three-way control valve 36 is communicated with the induced draft pipe 320, and two outlets (not shown) of the three-way control valve 36 are respectively communicated with the first shunt pipe 321 and the second shunt pipe 322; the second shunt pipe 322 is communicated with the first induced draft fan 331. It will be appreciated that the limestone grinding system 40 may adjust the three-way control valve 36 to reduce the amount of hot exhaust gas being directed from the transition preheat section of the grate 31 to the mill as the amount of limestone grinding decreases; when the limestone grinding rate increases, the three-way control valve 36 can also be adjusted to increase the amount of hot exhaust gas that is directed from the transition preheating section of the grate 31 to the mill.
Preferably, in a preferred implementation, the first branch pipe 321 is further provided with a first dust remover 37 and a second induced draft fan 332, and the second induced draft fan 332 is used for guiding the gas in the first branch pipe 321 to the flue gas purification device 35. The second induced draft fan 332 is a main induced draft fan for discharging the exhaust gas of the grate 31. It can be understood that, since the exhaust gas recycling system leads out a part of the transition preheating section of the grate 31, the amount of exhaust gas entering the second induced draft fan 332 (main induced draft fan) is reduced, and the investment and the operating cost of the main induced draft fan are reduced; meanwhile, the specification of the first dust remover 37 can be reduced, so that the floor area and investment of the main dust remover are reduced, and the engineering construction cost is reduced.
It will be appreciated that the exhaust gas discharge openings of the grate 31 communicate with the first shunt pipes 321 to achieve the effect of simultaneous treatment of other exhaust gases of the grate 31.
Wherein, first draught fan 331 is the frequency conversion draught fan, and the power of frequency conversion draught fan can be selected as required.
Further, a multi-tube dust collector 39 is provided on the second branch pipe 322 for removing dust from the passing exhaust gas.
In a preferred embodiment, a third induced draft fan 333 is further disposed on the exhaust duct 34 for guiding the gas of the exhaust duct 34 to the flue gas cleaning device 35. Wherein, the third induced draft fan 333 may also be a variable frequency induced draft fan.
Wherein, the flue gas purification equipment 35 can be desulfurization and denitrification purification equipment. Specifically, the purification module of the flue gas purification equipment 35 can be set as required according to the difference of materials, and is not repeated here.
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 (10)
1. An exhaust gas recycling system of a chain grate, comprising:
an induced draft pipe communicated with an air outlet of a preset preheating section of the chain grate;
the first induced draft fan is communicated with the induced draft pipe and used for guiding the waste gas flowing out of the air outlet of the preset preheating section to the air inlet of the limestone ore grinding system;
the exhaust pipe is communicated with an exhaust outlet of the limestone grinding system;
and the flue gas purification equipment is connected between the chimney and the exhaust pipe.
2. The exhaust gas recycling system of a drying grate of claim 1, wherein the pre-heating section is a transition pre-heating section of the drying grate.
3. The exhaust gas recycling system of a chain grate machine as claimed in claim 1, wherein said induced draft pipe is further in direct communication with said flue gas cleaning equipment through a first shunt pipe; a three-way control valve is further arranged between the induced draft pipe and the first induced draft fan, an inlet of the three-way control valve is communicated with the induced draft pipe, and two outlets of the three-way control valve are respectively communicated with the first shunt pipe and the second shunt pipe; and the second shunt pipe is communicated with the first induced draft fan.
4. The exhaust gas recycling system of a drying grate as claimed in claim 3, wherein the first shunt pipe is further provided with a first dust collector and a second induced draft fan, and the second induced draft fan is used for guiding the gas in the first shunt pipe to the flue gas purification equipment.
5. The exhaust gas recycling system of a drying grate of claim 3, wherein a multi-tube dust collector is further provided on the second branch pipe.
6. The exhaust gas reuse system of a drying grate of claim 3, wherein the exhaust gas discharge ports of the drying grate are communicated with the first shunt pipe.
7. The exhaust gas recycling system of a drying grate of claim 4, wherein the first induced draft fan is a variable frequency induced draft fan.
8. The exhaust gas recycling system of a drying grate as claimed in claim 1, wherein a third induced draft fan is further disposed on the exhaust duct for guiding the gas of the exhaust duct to the flue gas cleaning equipment.
9. The exhaust gas recycling system of a drying grate of claim 8, wherein the third induced draft fan is a variable frequency induced draft fan.
10. The exhaust gas recycling system of a drying grate of claim 1, wherein the flue gas cleaning apparatus is a desulfurization and denitrification cleaning apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021630188.5U CN213932088U (en) | 2020-08-07 | 2020-08-07 | Waste gas recycling system of chain grate machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021630188.5U CN213932088U (en) | 2020-08-07 | 2020-08-07 | Waste gas recycling system of chain grate machine |
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| Publication Number | Publication Date |
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| CN213932088U true CN213932088U (en) | 2021-08-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021630188.5U Active CN213932088U (en) | 2020-08-07 | 2020-08-07 | Waste gas recycling system of chain grate machine |
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| CN (1) | CN213932088U (en) |
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2020
- 2020-08-07 CN CN202021630188.5U patent/CN213932088U/en active Active
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