CN219264352U - Combustion-supporting system of hot-blast furnace with recirculated flue gas as denitration and heat supplement - Google Patents
Combustion-supporting system of hot-blast furnace with recirculated flue gas as denitration and heat supplement Download PDFInfo
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- CN219264352U CN219264352U CN202320989972.2U CN202320989972U CN219264352U CN 219264352 U CN219264352 U CN 219264352U CN 202320989972 U CN202320989972 U CN 202320989972U CN 219264352 U CN219264352 U CN 219264352U
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Abstract
The utility model relates to a combustion-supporting system of a hot blast stove with recirculated flue gas as denitration and heat supplement, which comprises a flue gas heat exchanger, a denitration reactor, a hot blast stove, a flue gas recirculation system, an induced draft fan and a chimney, wherein a cold end inlet of the flue gas heat exchanger is connected with a smoke purifying pipeline, a cold end outlet of the flue gas heat exchanger is connected with an inlet flue of the denitration reactor, an outlet flue of the denitration reactor is connected with a hot end inlet of the flue gas heat exchanger, a hot end outlet of the flue gas heat exchanger is connected with an inlet flue of the induced draft fan, an outlet flue of the induced draft fan is connected with the chimney, the hot blast stove is provided with a combustion-supporting air inlet, a hot end outlet of the flue gas heat exchanger is also connected with the combustion-supporting air inlet through the flue gas recirculation system, and the inlet flue passes through a hearth of the hot blast stove. The advantages are that: the structure design is reasonable, the increased air quantity entering the flue gas system is reduced, the air quantity of the induced draft fan is reduced, and the power consumption of the induced draft fan is reduced; the temperature of the recirculated flue gas is higher than that of air, the consumption of blast furnace gas is reduced, the energy is saved, and the economic benefit is good.
Description
Technical Field
The utility model relates to the technical field of flue gas denitration, in particular to a combustion-supporting system of a hot blast stove with recirculated flue gas as denitration and heat compensation.
Background
The temperature of sintering machine or pellet flue gas in the steel industry is low after dust removal and desulfurization, the SCR denitration temperature cannot be reached, the flue gas needs to be supplemented with heat by a hot blast stove, blast furnace gas is used as fuel, and air is used as combustion-supporting air conventionally. Waste gas generated by the combustion of blast furnace gas can enter a flue gas system, and air serving as combustion-supporting air can also enter the flue gas system to increase the gas quantity of the flue gas system. The increase of the flue gas volume can increase equipment selection, flue section size, chimney diameter and the like, and increase investment cost.
Therefore, in order to solve the above-mentioned situation, a combustion-supporting system of a hot blast stove is proposed, in which recirculated flue gas is used as denitration and heat supplement.
Disclosure of Invention
The utility model aims to provide a combustion-supporting system of a hot blast stove with recirculated flue gas as denitration and heat supplementing, which effectively overcomes the defects of the prior art.
The technical scheme for solving the technical problems is as follows:
the utility model provides a recycling flue gas is used as combustion-supporting system of denitration concurrent heating's hot-blast furnace, including flue gas heat exchanger, denitration reactor, hot-blast furnace, flue gas recycle system, draught fan and chimney, the cold junction import of above-mentioned flue gas heat exchanger is connected and is purified the tobacco pipe line, its cold junction export is connected the entry flue of above-mentioned denitration reactor, the export flue of above-mentioned denitration reactor is connected the hot junction import of above-mentioned flue gas heat exchanger, the hot junction export of above-mentioned flue gas heat exchanger is connected the entry flue of above-mentioned draught fan, the export flue of above-mentioned draught fan is connected the above-mentioned chimney, the hot-blast furnace is equipped with combustion-supporting wind import, the hot junction export of above-mentioned flue gas heat exchanger still is connected above-mentioned combustion-supporting wind import through above-mentioned flue gas recycle system, the furnace of above-mentioned entry flue passes the furnace.
On the basis of the technical scheme, the utility model can be improved as follows.
Further, the flue gas heat exchanger is a GGH flue gas heat exchanger.
Further, the hot blast stove is a direct combustion hot blast stove.
Further, the combustion-supporting air inlet is connected with a combustion-supporting air regulating valve.
Further, the flue gas recirculation system comprises a flue gas recirculation pipeline and a flue gas recirculation fan, wherein the flue gas recirculation pipeline is connected between the hot end outlet of the flue gas heat exchanger and the combustion-supporting air inlet, and the flue gas recirculation fan is communicated with the flue gas recirculation pipeline.
Further, the positions of the smoke recycling pipeline, which are close to the inlet and the outlet of the smoke recycling fan, are respectively communicated with an inlet valve and an outlet valve.
Further, the flue gas recirculation system is provided with two sets.
The beneficial effects of the utility model are as follows: the structure design is reasonable, the increased air quantity entering the flue gas system is reduced, the air quantity of the induced draft fan is reduced, and the power consumption of the induced draft fan is reduced; the temperature of the recirculated flue gas is higher than that of air, the consumption of blast furnace gas is reduced, the energy is saved, and the economic benefit is good.
Drawings
FIG. 1 is a schematic diagram of the combustion supporting system of the hot blast stove with recirculated flue gas as denitration and heat supplement according to the present utility model.
In the drawings, the list of components represented by the various numbers is as follows:
1. a flue gas heat exchanger; 2. a denitration reactor; 3. hot blast stove; 4. a flue gas recirculation system; 5. an induced draft fan; 6. a chimney; 31. a combustion-supporting air regulating valve; 41. a flue gas recirculation line; 42. a flue gas circulating fan; 43. an inlet valve; 44. and an outlet valve.
Detailed Description
The principles and features of the present utility model are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the utility model and are not to be construed as limiting the scope of the utility model.
Examples: as shown in fig. 1, the combustion-supporting system of the hot blast stove using recirculated flue gas as denitration and heat supplementing includes a flue gas heat exchanger 1, a denitration reactor 2, a hot blast stove 3, a flue gas recirculation system 4, a draught fan 5 and a chimney 6, wherein the cold end inlet of the flue gas heat exchanger 1 is connected with a smoke purifying pipeline, the cold end outlet thereof is connected with an inlet flue (denoted by a in the figure) of the denitration reactor 2, the outlet flue (denoted by b in the figure) of the denitration reactor 2 is connected with a hot end inlet of the flue gas heat exchanger 1, the hot end outlet of the flue gas heat exchanger 1 is connected with an inlet flue of the draught fan 5, the outlet flue of the draught fan 5 is connected with the chimney 6, the hot end outlet of the hot blast stove 3 is provided with a combustion-supporting wind inlet, the hot end outlet of the flue gas heat exchanger 1 is also connected with the combustion-supporting wind inlet through the flue gas recirculation system 4, and the inlet flue passes through a hearth of the hot blast stove 3.
The use process is as follows:
the clean flue gas after combustion treatment of the hot blast stove 3 is introduced into the flue gas heat exchanger 1 through a pipeline, the clean flue gas enters the denitration reactor 2 for denitration treatment after being heated (complemented) by the hearth of the hot blast stove 3, then enters the cold end of the flue gas heat exchanger 1 for heat exchange, after the heat exchange is finished, part of the clean flue gas is introduced into the chimney 6 for discharging through the induced draft fan 5, and the other part of the clean flue gas enters the hot blast stove 3 through the flue gas recirculation system 4 to serve as combustion air, so that the air quantity increased by the flue gas system entering the hot blast stove is reduced, the air quantity of the induced draft fan 5 is reduced, the power consumption of the induced draft fan is reduced, the section size of a flue is also reduced, and the disposable investment cost is reduced; the temperature of the recirculated flue gas is higher than that of air, the consumption of blast furnace gas is reduced, the energy is saved, and the economic benefit is good.
In this embodiment, the above-mentioned flue gas heat exchanger 1 adopts the GGH flue gas heat exchanger of the prior art, and its specific model can be selected flexibly and reasonably according to the actual use requirement, which is not described here in detail.
In this embodiment, the hot blast stove 3 is a direct combustion hot blast stove of the prior art.
As a preferred embodiment, a combustion air regulating valve 31 is connected to the combustion air inlet.
In the above embodiment, the combustion air quantity is adjusted by the combustion air adjusting valve 31, and the combustion air quantity is better matched with the blast furnace gas quantity introduced into the hot blast stove 3, so that the optimal combustion state is realized.
As a preferred embodiment, the flue gas recirculation system 4 includes a flue gas recirculation line 41 and a flue gas recirculation fan 42, the flue gas recirculation line 41 is connected between the hot end outlet of the flue gas heat exchanger 1 and the combustion air inlet, and the flue gas recirculation fan 42 is disposed on the flue gas recirculation line 41 in a communicating manner.
In the above embodiment, the flow of the clean flue gas in the flue gas recirculation line 41 is promoted by the flue gas recirculation fan 42, so that it is smoothly led into the stove 3 as combustion air. The design reduces the air quantity of the induced draft fan 5 and reduces the power consumption of the induced draft fan 5.
As a preferred embodiment, the flue gas recirculation line 41 is provided with an inlet valve 43 and an outlet valve 44 in communication with the inlet and outlet of the flue gas recirculation fan 42, respectively.
In the above embodiment, the inlet valve 43 and the outlet valve 44 can be flexibly opened and closed, so that the flow of flue gas in the flue gas recirculation line 41 is regulated according to the requirements.
In this embodiment, the inlet valve 43 and the outlet valve 44 may be automatic on-off valves in the prior art, and after the flue gas recirculation fan 42 is turned on, the flue gas flows and then is automatically turned on and off.
In this embodiment, the above-mentioned flue gas recirculation system 4 is provided with two sets, and by designing two sets of use modes of "one for one" is realized, one can be selected for use when needed, and the use is more reliable.
In this embodiment, an air flow sensor may be disposed at the hot end outlet of the flue gas heat exchanger 1, an electromagnetic valve is disposed at the inlet of the induced draft fan 5, the air flow sensor and the electromagnetic valve are connected to a controller together, and a control system is formed by combination, when the air flow sensor detects that the flow is low, the electromagnetic valve is controlled to be closed, when the flow detected to be out from the hot end outlet of the flue gas heat exchanger 1 is greater than a set value, the electromagnetic valve at the inlet of the induced draft fan 5 is opened, so as to realize the split operation of clean flue gas, and the purpose of the design is to preferentially satisfy the recirculation of combustion air of the hot blast stove 3, and the balance is discharged outside through the chimney 6.
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.
Claims (7)
1. A combustion-supporting system of a hot blast stove for denitration and heat supplement by recycling flue gas, which is characterized in that: including flue gas heat exchanger (1), denitration reactor (2), hot-blast furnace (3), flue gas recirculation system (4), draught fan (5) and chimney (6), the cold junction access connection of flue gas heat exchanger (1) is clean tobacco pipe line, its cold junction exit linkage the entry flue of denitration reactor (2), the exit flue of denitration reactor (2) is connected the hot junction import of flue gas heat exchanger (1), the hot junction exit linkage of flue gas heat exchanger (1) the entry flue of draught fan (5), the exit flue of draught fan (5) is connected chimney (6), hot-blast furnace (3) are equipped with the combustion-supporting wind import, the hot junction export of flue gas heat exchanger (1) is still passed through flue gas recirculation system (4) are connected the combustion-supporting wind import, the entry flue passes the furnace of hot-blast furnace (3).
2. A combustion supporting system for a hot blast stove for denitration and heat supplement according to claim 1, wherein: the flue gas heat exchanger (1) is a GGH flue gas heat exchanger.
3. A combustion supporting system for a hot blast stove for denitration and heat supplement according to claim 1, wherein: the hot blast stove (3) is a direct combustion type hot blast stove.
4. A combustion supporting system for a hot blast stove for denitration and heat supplement according to claim 1, wherein: the combustion-supporting air inlet is connected with a combustion-supporting air regulating valve (31).
5. A combustion supporting system for a hot blast stove for denitration and heat supplement according to claim 1, wherein: the flue gas recirculation system (4) comprises a flue gas recirculation pipeline (41) and a flue gas recirculation fan (42), wherein the flue gas recirculation pipeline (41) is connected between a hot end outlet of the flue gas heat exchanger (1) and a combustion air inlet, and the flue gas recirculation fan (42) is communicated with the flue gas recirculation pipeline (41).
6. A combustion supporting system for a hot blast stove for denitration and heat supplement according to claim 5, wherein: and the parts of the flue gas recirculation pipeline (41) close to the inlet and the outlet of the flue gas recirculation fan (42) are respectively communicated with an inlet valve (43) and an outlet valve (44).
7. A combustion supporting system for a hot blast stove for denitration and heat addition according to any one of claims 1 to 5, wherein: the flue gas recirculation system (4) is provided with two sets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320989972.2U CN219264352U (en) | 2023-04-27 | 2023-04-27 | Combustion-supporting system of hot-blast furnace with recirculated flue gas as denitration and heat supplement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320989972.2U CN219264352U (en) | 2023-04-27 | 2023-04-27 | Combustion-supporting system of hot-blast furnace with recirculated flue gas as denitration and heat supplement |
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| Publication Number | Publication Date |
|---|---|
| CN219264352U true CN219264352U (en) | 2023-06-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320989972.2U Active CN219264352U (en) | 2023-04-27 | 2023-04-27 | Combustion-supporting system of hot-blast furnace with recirculated flue gas as denitration and heat supplement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219264352U (en) |
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2023
- 2023-04-27 CN CN202320989972.2U patent/CN219264352U/en active Active
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