Oxy-fuel combustion system for annular furnace

Abstract

The utility model belongs to the technical field of steel rolling annular furnaces, and particularly relates to an all-oxygen combustion system for an annular furnace, which comprises a charging area, a preheating area, a heating area, a soaking area and a discharging area which are sequentially arranged, the preheating area comprises a zero area and a first area, and the first area adopts an all-oxygen straight flame / flameless combustor; the heating area is divided into a second area, a third area, a fourth area and a fifth area, and all the second area, the third area, the fourth area and the fifth area adopt all-oxygen flameless combustors; the soaking area is divided into six areas, and the six areas adopt an all-oxygen flameless burner; the discharging area is a seventh area, and a pulse total oxygen direct flame burner is adopted in the seventh area; the oxygen header pipe is connected with the combustors through branch pipes; the gas header pipe is connected with the combustors through branch pipes. The smoke exhaust header pipe is arranged in the zero area of the preheating area and connected with the smoke exhaust pipeline. According to the oxygen-fuel combustion system, the productivity can be improved, the smoke exhaust heat loss can be reduced, and the problems that blanks are heated unevenly and the local temperature difference is large can be effectively solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of steel rolling annular furnaces, in particular to a full oxygen combustion system used for annular furnaces. Background Art

[0002] Ring furnaces are widely used for heating materials in metallurgy, ceramics and machinery manufacturing industries. The furnace bottom rotates to move the blanks placed on the bottom from the charging port to the discharging port. During the combustion process of the ring furnace, the flue gas produced contains a large amount of nitrogen oxides, which are discharged through the chimney, causing atmospheric pollution. Conventional ring furnaces have a series of problems such as low output, high energy consumption, high burnout, and uneven heating of blanks.

[0003] The characteristics of oxy-fuel combustion technology are high heat transfer efficiency and low smoke loss. When applied to the ring furnace system, it can greatly reduce energy consumption and increase production. However, oxy-fuel combustion technology also has the problem of excessive heat concentration and easy local high temperature. If oxy-fuel combustion technology is directly used on the ring furnace, there will be obvious high temperature areas in the furnace during operation, which will eventually lead to poor temperature uniformity of the billet, and in serious cases affect the normal production of the subsequent rolling mill.

[0004] Chinese patent CN114688868A discloses a full oxygen combustion system for a steel rolling heating furnace, including a heating furnace, a fuel system, a combustion-supporting system, a nitrogen purge system, a smoke exhaust system, and a control system; the heating furnace includes a preheating section, a heating section, and a soaking section. Full oxygen flameless burners are arranged on the side walls of the upper heating zone and the lower heating zone of the heating section, and the full oxygen flameless burners are arranged in layers up and down and staggered left and right. Full oxygen flameless burners are arranged on the side walls of the upper heating zone and the lower heating zone of the soaking section, and the full oxygen flameless burners are arranged in layers up and down and staggered left and right; full oxygen flameless burners are arranged on the end wall of the upper heating zone of the soaking section in a horizontal single-layer arrangement. The control system includes a billet tracking system, an intelligent temperature control system, a furnace pressure control system, a chain alarm protection system, and a billet insulation waiting system. The full oxygen combustion system of this patent is for square furnaces, but not applicable to ring furnaces. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a full oxygen combustion system for an annular furnace, so that the temperature in the annular furnace is more uniform, while achieving the purpose of energy saving and consumption reduction, the blanks in the annular furnace can be heated more evenly.

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

[0007] The utility model provides a full oxygen combustion system for an annular furnace, comprising: a charging zone, a preheating zone, a heating zone, a uniform heating zone and a discharging zone which are arranged in sequence, the preheating zone is divided into a zero zone and a first zone, the first zone adopts a full oxygen straight flame / flameless burner; the heating zone is connected to the preheating zone, the heating zone is divided into a second zone, a third zone, a fourth zone and a fifth zone, the second zone, the third zone, the fourth zone and the fifth zone all adopt a full oxygen flameless burner; the uniform heating zone is connected to the heating zone, the uniform heating zone is divided into a sixth zone, the sixth zone adopts a full oxygen flameless burner; the discharging zone is connected to the uniform heating zone, the discharging zone is divided into a seventh zone, the seventh zone adopts a pulse full oxygen straight flame burner; the oxygen main pipe is connected to each burner through a branch pipe respectively; the gas main pipe is connected to each burner through a branch pipe respectively; the smoke exhaust main pipe is arranged in the zero zone of the preheating zone, and is connected to the smoke exhaust pipe.

[0008] Furthermore, the burners of the one zone are horizontally arranged on the inner and outer ring walls of the one zone of the annular furnace, and the number of burners arranged on the outer ring wall is equal to the number of burners arranged on the inner ring wall.

[0009] Furthermore, the second zone uses pulsed full-oxygen flameless burners, and the burners are horizontally arranged on the inner and outer ring walls of the second zone of the annular furnace, and the number of burners arranged on the outer ring wall is greater than the number of burners on the inner ring wall.

[0010] Furthermore, the burners of the three zones are horizontally arranged on the inner and outer ring walls of the three zones of the annular furnace, and the number of burners arranged on the outer ring wall is greater than the number of burners arranged on the inner ring wall.

[0011] Furthermore, the burners of the four zones are horizontally arranged on the inner and outer ring walls of the four zones of the annular furnace, and the number of burners arranged on the outer ring wall is greater than the number of burners arranged on the inner ring wall.

[0012] Furthermore, the burners of the five zones are horizontally arranged on the inner and outer ring walls of the five zones of the annular furnace, and the number of burners arranged on the outer ring wall is equal to the number of burners arranged on the inner ring wall.

[0013] Furthermore, the burners of the six zones are horizontally arranged on the inner and outer ring walls of the six zones of the annular furnace, and the number of burners arranged on the outer ring wall is equal to the number of burners arranged on the inner ring wall.

[0014] Furthermore, the pulsed full oxygen direct flame burners in the seventh zone are arranged on the inner wall surface of the seventh zone of the annular furnace.

[0015] Further, the loading zone is located between zone zero of the preheating zone and zone seven of the discharging zone.

[0016] The advantages and positive effects of the utility model are:

[0017] The full oxygen combustion system of the utility model can not only improve the production capacity, reduce the heat loss of smoke exhaust, and improve the thermal efficiency of the annular furnace, but also effectively improve the problems of uneven heating of the billet and large local temperature difference, thereby achieving the purpose of energy saving and consumption reduction and improving product production quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the annular furnace of the utility model;

[0019] Figure 2 It is a schematic diagram of the full oxygen combustion system of the utility model.

[0020] The above drawings include the following reference numerals:

[0021] 0-Zone Zero; 1-Zone One; 2-Zone Two; 3-Zone Three; 4-Zone Four; 5-Zone Five; 6-Zone Six; 7-Discharging Zone; 8-Exhaust Main Pipe; 9-Loading Zone; 10-Full Oxygen Direct Flame / Flameless Burner; 11-Full Oxygen Flameless Burner. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0024] In the description of the present invention, it should be understood that the terms "upper", "lower", "vertical", "horizontal", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] like Figure 1-Figure 2 As shown, the utility model provides a full oxygen combustion system for an annular furnace, comprising: a loading area 9, a preheating area, a heating area, a heat equalization area and a discharge area arranged in sequence, the oxygen main pipe is connected to each burner through a branch pipe; the gas main pipe is connected to each burner through a branch pipe; the smoke exhaust main pipe 8 is arranged in the zero zone 0 of the preheating zone and is connected to the smoke exhaust pipe.

[0026] The preheating zone is divided into zero zone 0 and one zone 1. The zero zone 0 preheats the blank by the waste heat of the high-temperature exhaust gas generated by the furnace body, and the one zone 1 adopts a full-oxygen direct flame / flameless burner 10; the combustion-supporting gas of the full-oxygen direct flame / flameless burner 10 of the one zone 1 is pure oxygen, and the burners are horizontally arranged on the inner and outer ring walls of the one zone 1 of the annular furnace, and the number of burners arranged on the outer ring wall is equal to the number of burners on the inner ring wall.

[0027] The heating zone is connected to the preheating zone, and the heating zone is zone 2, zone 3, zone 4, and zone 5. The zones 2, 3, 4, and 5 all use full oxygen flameless burners 11. The zone 2 uses a pulse full oxygen flameless burner, the combustion-supporting gas of the burner is pure oxygen, and the burner is horizontally arranged on the inner and outer ring walls of the annular furnace zone 2, and the number of burners arranged on the outer ring wall is greater than the number of burners on the inner ring wall. The combustion-supporting gas of the full oxygen flameless burner 11 of the zone 3 is pure oxygen, and the burner is horizontally arranged on the inner and outer ring walls of the annular furnace zone 3, and the number of burners arranged on the outer ring wall is greater than the number of burners on the inner ring wall. The combustion-supporting gas of the full oxygen flameless burner 11 of the zone 4 is pure oxygen, and the burner is horizontally arranged on the inner and outer ring walls of the annular furnace zone 4, and the number of burners arranged on the outer ring wall is greater than the number of burners on the inner ring wall. The combustion-supporting gas of the oxy-flameless burners 11 in the fifth zone 5 is pure oxygen, and the burners are arranged horizontally on the inner and outer wall surfaces of the fifth zone 5 of the annular furnace, and the number of burners arranged on the outer wall surface is equal to the number of burners arranged on the inner wall surface.

[0028] The equalizing zone is connected to the heating zone, and the equalizing zone is the sixth zone 6. The sixth zone 6 adopts a full-oxygen flameless burner 11; the combustion-supporting gas of the full-oxygen flameless burner 11 of the sixth zone 6 is pure oxygen, and the burners are horizontally arranged on the inner and outer ring walls of the sixth zone 6 of the annular furnace, and the number of burners arranged on the outer ring wall is equal to the number of burners on the inner ring wall.

[0029] The discharge zone is connected to the uniform heating zone, and the discharge zone is the seventh zone 7, and the seventh zone 7 adopts a pulsed full oxygen direct flame burner. The pulsed full oxygen direct flame burner of the seventh zone 7 is arranged on the inner wall of the seventh zone 7 of the annular furnace. The charging zone 9 is located between the zero zone 0 of the preheating zone and the seventh zone 7 of the discharge zone.

[0030] The flameless combustion technology in the full oxygen combustion system of the annular furnace of the utility model can reduce the local high temperature and make the flow field more stable and uniform.

[0031] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A full oxygen combustion system for an annular furnace, characterized in that: include: The loading area (9), preheating area, heating area, equalizing area and discharging area are arranged in sequence. A preheating zone, wherein the preheating zone includes a zero zone (0) and a first zone (1), and the first zone (1) adopts a full oxygen direct flame / flameless burner (10); A heating zone, the heating zone is connected to the preheating zone, the heating zone is divided into a second zone (2), a third zone (3), a fourth zone (4), and a fifth zone (5), and the second zone (2), the third zone (3), the fourth zone (4), and the fifth zone (5) all use a full oxygen flameless burner (11); A heat equalization zone, the heat equalization zone is connected to the heating zone, the heat equalization zone is six zones (6), and the six zones (6) adopt a full oxygen flameless burner (11); A discharge zone, the discharge zone is connected to the heat-saturating zone, the discharge zone is a seventh zone (7), and the seventh zone (7) adopts a pulsed full oxygen direct flame burner; The oxygen main pipe is connected to each burner through branch pipes; The gas main pipe is connected to each burner through branch pipes; A smoke exhaust main pipe (8), wherein the smoke exhaust main pipe (8) is arranged in the zero zone (0) of the preheating zone and is connected to the smoke exhaust pipe.

2. The full oxygen combustion system for annular furnace according to claim 1, characterized in that: The burners of the first zone (1) are arranged horizontally on the inner and outer wall surfaces of the first zone (1) of the annular furnace, and the number of burners arranged on the outer wall surface is equal to the number of burners arranged on the inner wall surface.

3. The full oxygen combustion system for annular furnace according to claim 1, characterized in that: The second zone (2) uses pulsed full-oxygen flameless burners, and the burners are horizontally arranged on the inner and outer wall surfaces of the second zone (2) of the annular furnace, and the number of burners arranged on the outer wall surface is greater than the number of burners arranged on the inner wall surface.

4. The oxyfuel combustion system for annular furnace according to claim 1, characterized in that: The burners of the three zones (3) are horizontally arranged on the inner and outer wall surfaces of the three zones (3) of the annular furnace, and the number of burners arranged on the outer wall surface is greater than the number of burners arranged on the inner wall surface.

5. The oxyfuel combustion system for annular furnace according to claim 1, characterized in that: The burners of the four zones (4) are horizontally arranged on the inner and outer wall surfaces of the four zones (4) of the annular furnace, and the number of burners arranged on the outer wall surface is greater than the number of burners arranged on the inner wall surface.

6. The oxyfuel combustion system for annular furnace according to claim 1, characterized in that: The burners of the five zones (5) are arranged horizontally on the inner and outer wall surfaces of the five zones (5) of the annular furnace, and the number of burners arranged on the outer wall surface is equal to the number of burners arranged on the inner wall surface.

7. The oxyfuel combustion system for annular furnace according to claim 1, characterized in that: The burners of the six zones (6) are horizontally arranged on the inner and outer wall surfaces of the six zones (6) of the annular furnace, and the number of burners arranged on the outer wall surface is equal to the number of burners arranged on the inner wall surface.

8. The oxyfuel combustion system for annular furnace according to claim 1, characterized in that: The pulsed full oxygen direct flame burner of the seventh zone (7) is arranged on the inner wall surface of the seventh zone (7) of the annular furnace.

9. The oxyfuel combustion system for annular furnace according to claim 1, characterized in that: The loading zone (9) is located between the zero zone (0) of the preheating zone and the seven zone (7) of the discharging zone.

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