Air cooling system of reduction furnace

Abstract

The utility model relates to the technical field of metallurgy, in particular to an air cooling system of a reduction furnace, which comprises an annular air pipe arranged on the outer side of the reduction furnace, the annular air pipe is respectively connected with a plurality of groups of air cooling sleeves positioned on the east side, the south side, the west side and the north side of the reduction furnace through branch pipes, and the annular air pipe is communicated with a fan; the annular air pipe is divided into an east-side air pipe, a south-side air pipe, a west-side air pipe and a north-side air pipe through four blind plates, wherein the east-side air pipe is communicated with the west-side air pipe through a first communicating air pipe; the south side air pipe is communicated with the north side air pipe through a second communication air pipe; the number of the draught fans is two, the draught fans are the first draught fan and the second draught fan respectively, an air outlet of the first draught fan is connected with an east side air pipe, an air inlet of the first draught fan is connected with a dust collecting cover arranged at a slag tap of the bottom blowing furnace through a first air inducing pipe, and a first dust remover is arranged on the first air inducing pipe. And an air outlet of the second fan is connected with the second communicating air pipe. According to the utility model, the problem that the environment is polluted by the flashed flue gas during deslagging of the bottom blowing furnace is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of metallurgy, in particular to an air cooling system for a reduction furnace. Background Art

[0002] The current reduction furnace air cooling system is as follows Figure 2 As shown, the reduction furnace is provided with a plurality of groups of air-cooling jackets for cooling the furnace body on its east, west, south and north sides, and a circular air duct is provided outside the reduction furnace, the air duct is connected to the fan, and the air duct is located on the east, west, south and north sides of the reduction furnace and is connected to each air-cooling jacket, wherein the hot air discharged from the air-cooling jackets on the south and north sides (or after heat exchange through the heat exchanger) is discharged outside, and the hot air discharged from the air-cooling jackets on the east and west sides enters the reduction furnace as secondary air.

[0003] In the metal smelting process, the slag discharge port of the bottom-blown furnace will discharge flue gas containing dust and sulfur dioxide during the slag discharge process, which pollutes the environment and is not conducive to the health of the workers. In addition, when the bottom-blown furnace is loaded, there is a dust problem, which also affects the working environment.

[0004] Based on this, the present application develops a reduction furnace air cooling system that can solve the problems of flue gas discharge from the slag outlet of the bottom blowing furnace and dust from the feeding port, which is conducive to improving the working environment. Utility Model Content

[0005] The utility model aims to solve the technical problems existing in the prior art. To this end, the utility model provides a reduction furnace air cooling system that can solve the problems of flue gas discharge from the slag outlet of the bottom blowing furnace and dust emission from the feeding port, which is beneficial to improving the working environment.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] A reduction furnace air cooling system is provided, comprising an annular air duct arranged on the outside of the reduction furnace, the annular air duct being connected to a plurality of groups of air cooling sleeves located on the east, south, west and north sides of the reduction furnace through branch pipes, and the annular air duct is connected to a fan; it is characterized in that: the annular air duct is divided into an east side air duct, a south side air duct, a west side air duct and a north side air duct by four blind plates, wherein: the east side air duct is connected with the west side air duct through a first connecting air duct; the south side air duct is connected with the north side air duct through a second connecting air duct; there are two fans, namely a first fan and a second fan, the air outlet of the first fan is connected to the east side air duct, and the air inlet is connected to a dust collecting hood arranged at the slag discharge port of the bottom blowing furnace through a first induced draft duct, the first induced draft duct is provided with a first dust collector; the air outlet of the second fan is connected to the second connecting air duct.

[0008] In a preferred embodiment of the utility model, the air inlet of the second fan is connected to a dust collecting hood arranged in the loading area of ​​the bottom blowing furnace through a second induced draft duct, and a second dust collector is arranged on the second induced draft duct.

[0009] Preferably, the first dust collector and the second dust collector are both cartridge dust collectors or bag dust collectors.

[0010] In a preferred embodiment of the utility model, a third connecting air duct is further provided between the first air duct and the second air duct, and a first electric butterfly valve and a second electric butterfly valve are respectively provided on the first air duct and the third connecting air duct.

[0011] In a preferred embodiment of the present utility model, the second fan is further connected to the east side air duct through a fourth connecting air duct, and a third electric butterfly valve is provided on the fourth connecting air duct.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. The utility model can use the first fan to filter the flue gas discharged from the slag discharge port of the bottom blowing furnace and send it to the air cooling jackets on the east and west sides of the reduction furnace, take away part of the heat of the reduction furnace and send it into the reduction furnace as secondary air. The sulfur dioxide in the flue gas is discharged to the tail gas treatment system along with the flue gas of the reduction furnace for treatment, which solves the problem of the flash exhaust of the flue gas polluting the environment when the bottom blowing furnace is discharged;

[0014] 2. The utility model can also use the second fan to filter the dust generated in the feeding area of ​​the bottom blowing furnace and send it to the air cooling jackets on the south and north sides, take away part of the heat of the reduction furnace and then discharge it directly or after heat exchange in the heat exchanger, thus solving the problem of dust pollution in the feeding area of ​​the bottom blowing furnace;

[0015] 3. The utility model can also use the first fan to filter the dust generated in the feeding area of ​​the bottom blowing furnace and send it to the air cooling jackets on the east and west sides of the reduction furnace, take away part of the heat of the reduction furnace and send it into the reduction furnace as secondary air;

[0016] 4. The utility model can also meet the problem that one of the fans is damaged, and one fan can provide cold source air to multiple groups of air cooling jackets on the east, south, west and north sides. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0018] Figure 1 This is a structural principle diagram of the reduction furnace air cooling system provided by the utility model;

[0019] Figure 2It is a structural principle diagram of an existing reduction furnace air cooling system.

[0020] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0021] 1—annular air duct, 1.1—east air duct, 1.2—south air duct, 1.3—west air duct, 1.4—north air duct, 2—fan, 2.1—first fan, 2.2—second fan, 3—blind plate, 4—first connecting air duct, 5—second connecting air duct, 6—first induced draft duct, 7—first dust collector, 8—second induced draft duct, 9—second dust collector, 10—third connecting air duct, 11—first electric butterfly valve, 12—second electric butterfly valve, 13—fourth connecting air duct, 14—third electric butterfly valve. DETAILED DESCRIPTION

[0022] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating positions or positional relationships are based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific position, be constructed and operate in a specific position, and therefore should not be understood as limiting the present invention;

[0025] In addition, the descriptions involving the terms "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. The terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0027] The existing reduction furnace air cooling system is as follows Figure 2 As shown, two fans 2 deliver cold air to the annular air duct 1, and the cold air enters into multiple groups of air-cooling jackets on the east, south, west and north sides of the reduction furnace, taking away the hot air in the air-cooling jackets. The hot air exhausted from the air-cooling jackets on the south and north sides (or after heat exchange through the heat exchanger) is discharged outside, and the hot air exhausted from the air-cooling jackets on the east and west sides enters the reduction furnace as secondary air.

[0028] Embodiment 1

[0029] In order to solve the problem of exhausting flue gas containing dust and sulfur dioxide during the slag discharge process of the bottom blowing furnace, which pollutes the environment, the following implementation plan is provided:

[0030] A reduction furnace air cooling system, as shown in the attached Figure 1 As shown, it includes an annular air duct 1 arranged outside the reduction furnace, and the annular air duct 1 is divided into an east side air duct 1.1, a south side air duct 1.2, a west side air duct 1.3 and a north side air duct 1.4 by four blind plates 3, wherein:

[0031] The east side air duct 1.1 is connected with the west side air duct 1.3 via the first connecting air duct 4;

[0032] The south side air duct 1.2 is connected with the north side air duct 1.4 via a second connecting air duct 5;

[0033] The two fans 2 are respectively the first fan 2.1 and the second fan 2.2. The air outlet of the first fan 2.1 is connected to the east side air duct 1.2, and the air inlet is connected to the dust collecting hood arranged at the slag discharge port of the bottom blowing furnace through the first induced draft duct 6. The first induced draft duct 6 is provided with a first dust collector 7; the air outlet of the second fan 2.2 is connected to the second connecting air duct 5.

[0034] In this embodiment, the first fan can filter the flue gas discharged from the slag discharge port of the bottom blowing furnace and send it to the air cooling jackets on the east and west sides of the reduction furnace, take away part of the heat of the reduction furnace and send it into the reduction furnace as secondary air. The sulfur dioxide in the flue gas is discharged to the tail gas treatment system along with the flue gas of the reduction furnace for treatment, solving the problem of the flue gas flashing during the bottom blowing furnace slag discharge polluting the environment. The air cooling jackets on the south and north sides of the reduction furnace are provided with cold sources by the second fan drawing cold air from the outside.

[0035] Implementation II

[0036] In order to solve the dust problem when loading the bottom blowing furnace, the following implementation plan is provided:

[0037] As attached Figure 1 As shown, based on the first embodiment, the air inlet of the second fan 2.2 of this embodiment is connected to the dust collecting hood arranged in the loading area of ​​the bottom blowing furnace through the second air duct 8, and the second air duct 8 is provided with a second dust collector 9.

[0038] This embodiment can utilize the second fan to filter the dust generated in the loading area of ​​the bottom blowing furnace and send it into the air cooling jackets on the south and north sides, taking away part of the heat from the reduction furnace and then directly discharging it to the outside or discharging it to the outside after heat exchange through a heat exchanger, thus solving the problem of dust pollution in the loading area of ​​the bottom blowing furnace.

[0039] Embodiment 3

[0040] As attached Figure 1 As shown, based on the second embodiment, this embodiment further provides a third connecting air duct 10 between the first air duct 6 and the second air duct 8, and the first air duct 6 and the third connecting air duct 10 are provided with a first electric butterfly valve 11 and a second electric butterfly valve 12 respectively.

[0041] This embodiment can also realize that the dust generated in the feeding area of ​​the bottom blowing furnace is sent to the air cooling jackets on the east and west sides of the reduction furnace after filtering by the first fan through the control of the first electric butterfly valve and the second electric butterfly valve, and then sent into the reduction furnace as secondary air after taking away part of the heat of the reduction furnace. In specific implementation, when the bottom blowing furnace does not have slag discharge, the first electric butterfly valve can be controlled to close and the second electric butterfly valve can be controlled to open. At this time, the dust suction capacity of the feeding area of ​​the bottom blowing furnace will be greatly improved, thereby improving the dust suction effect; and when the bottom blowing furnace needs to discharge slag, the first electric butterfly valve is opened and the second electric butterfly valve is closed, and the smoke escaping from the slag discharge is normally extracted.

[0042] Embodiment 4

[0043] As attached Figure 1 As shown, on the basis of the third embodiment, the second fan 2.2 of this embodiment is further connected to the east side air duct 1.1 through a fourth connecting air duct 13, and a third electric butterfly valve 14 is provided on the fourth connecting air duct 13.

[0044] The design of this embodiment can also meet the requirement that one of the fans is damaged, and one fan can provide cold source air to multiple groups of air-cooling jackets on the east, south, west and north sides. However, when discharging slag, the first electric butterfly valve needs to be closed to prevent smoke from being discharged from the air-cooling jackets on the south and north sides and polluting the air.

[0045] Preferably, the first dust collector 7 and the second dust collector 9 described in the above embodiments are both cartridge dust collectors or bag dust collectors.

[0046] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A reduction furnace air cooling system, comprising an annular air duct arranged outside the reduction furnace, the annular air duct being connected to a plurality of groups of air cooling jackets located on the east, south, west and north sides of the reduction furnace through branch pipes, and the annular air duct being connected to a fan; characterized in that: The annular air duct is divided into an east air duct, a south air duct, a west air duct and a north air duct by four blind plates, wherein: The east side air duct is connected with the west side air duct through a first connecting air duct; The south side air duct is connected with the north side air duct through a second connecting air duct; There are two fans, namely the first fan and the second fan. The air outlet of the first fan is connected to the east side air duct, and the air inlet is connected to the dust collecting hood arranged at the slag discharge port of the bottom blowing furnace through the first induced draft duct. The first induced draft duct is provided with a first dust collector; the air outlet of the second fan is connected to the second connecting air duct.

2. The reduction furnace air cooling system according to claim 1, characterized in that: The air inlet of the second fan is connected to a dust collecting hood arranged in the loading area of ​​the bottom blowing furnace through a second air duct, and a second dust collector is arranged on the second air duct.

3. The reduction furnace air cooling system according to claim 1, characterized in that: The first dust collector and the second dust collector both adopt cartridge dust collectors or bag dust collectors.

4. The reduction furnace air cooling system according to claim 2, characterized in that: A third connecting air duct is further provided between the first air duct and the second air duct, and a first electric butterfly valve and a second electric butterfly valve are respectively provided on the first air duct and the third connecting air duct.

5. The reduction furnace air cooling system according to claim 4, characterized in that: The second fan is also connected to the east side air duct through a fourth connecting air duct, and a third electric butterfly valve is provided on the fourth connecting air duct.

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