Multimode working blast furnace gas oxygen-enriched burner

Abstract

The application discloses a multi-modal working blast furnace gas oxygen-enriched burner, which comprises a shell, a primary pre-combustion pipe coaxially and fixedly connected in the shell, a first interval and a second interval vertically divided in the shell, a blast furnace gas inlet pipe fixedly and communicatively connected on the outer wall of the shell and communicated with the first interval, a primary combustion-supporting system comprising a first combustion-supporting unit and a second combustion-supporting unit, the second combustion-supporting unit being vertically and fixedly connected on the first combustion-supporting unit and communicated with the first combustion-supporting unit, a secondary combustion-supporting system fixedly connected on the outer side wall of the shell and communicated with the second interval in the shell, and an ignition unit arranged on the shell. The multi-modal working blast furnace gas oxygen-enriched burner provided by the application adopts a blast furnace gas preheating strategy, improves the combustion temperature, reduces the temperature of outlet gas and improves the energy utilization efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of blast furnace gas burners, in particular to a multi-modal working blast furnace gas oxygen-enriched burner. BACKGROUND

[0002] Blast furnace gas is an important by-product in the process of blast furnace ironmaking, and about 3000m 3 of blast furnace gas is generated per ton of pig iron smelted. The energy carried by these gases accounts for about 15% of the total energy of the steel industry, and has a very high secondary utilization value. The main components of blast furnace gas are N2, CO, CO2, H2 and a small amount of other components. The only combustible substances are CO and H2, and CO accounts for more than 90% of the combustible components. The calorific value of blast furnace gas is only 3300-4200kJ / m 3 . Due to the low calorific value and low content of combustible components in blast furnace gas, it is difficult to ignite, the combustion is easy to extinguish, the combustion temperature is low, and the combustion is incomplete in the case of air combustion, which causes great hidden troubles in actual use. Therefore, at present, blast furnace gas has not been fully utilized, and a large amount of blast furnace gas is wasted.

[0003] The design of the blast furnace gas burner of the prior art cannot well solve the problems of low blast furnace gas combustion temperature, unstable combustion and high concentration of nitrogen oxides in the exhaust gas. At the same time, a single combustion-supporting gas cannot well adapt to different working conditions, and it is difficult to be put into actual industrial production. In order to fully utilize blast furnace gas and avoid resource waste and air pollution, the present application provides a blast furnace gas burner which can be used in actual industrial production. SUMMARY

[0004] The purpose of the present application is to provide a multi-modal working blast furnace gas oxygen-enriched burner to solve the problems existing in the prior art.

[0005] To achieve the above-mentioned purpose, the present application provides the following scheme: the present application provides a multi-modal working blast furnace gas oxygen-enriched burner, comprising:

[0006] a housing, a primary pre-combustion pipe is coaxially and fixedly connected in the housing, a space is arranged between the primary pre-combustion pipe and the inner wall of the housing, the housing is vertically divided into a first interval and a second interval, a blast furnace gas inlet pipe is fixedly and communicatively connected to the outer wall of the housing, and the blast furnace gas inlet pipe communicates with the first interval;

[0007] a primary combustion-supporting system, the primary combustion-supporting system comprises a first combustion-supporting unit and a second combustion-supporting unit, the first combustion-supporting unit penetrates through the housing and extends into the primary pre-combustion pipe, the second combustion-supporting unit is vertically and fixedly connected to the first combustion-supporting unit, and the second combustion-supporting unit communicates with the first combustion-supporting unit;

[0008] A secondary combustion-supporting system is fixedly connected to the outer sidewall of the shell and communicates with the second zone in the shell;

[0009] An ignition unit is arranged on the shell, and a working end of the ignition unit extends into the primary precombustion pipe and is arranged correspondingly to the first combustion-supporting unit;

[0010] The first zone communicates with the inner cavity of the primary precombustion pipe, and one end of the primary precombustion pipe located in the second zone is arranged as an open end.

[0011] According to the multi-modal working blast furnace gas oxygen-enriched burner, the first combustion-supporting unit comprises a sleeve pipe, the sleeve pipe penetrates through the shell and extends into the primary precombustion pipe, the sleeve pipe is arranged coaxially with the shell, the sleeve pipe is fixedly connected with the primary precombustion pipe and the shell, an oxygen pipe is fixedly connected coaxially in the shell, an output end of the oxygen pipe extends into the primary precombustion pipe and is arranged correspondingly to the ignition unit, a space is arranged between the oxygen pipe and the sleeve pipe, and an oxygen valve is arranged on the oxygen pipe.

[0012] According to the multi-modal working blast furnace gas oxygen-enriched burner, the second combustion-supporting unit comprises a primary air inlet pipe which is fixedly connected vertically to the sidewall of the sleeve pipe, the primary air inlet pipe communicates with the space between the oxygen pipe and the sleeve pipe, a primary air valve is arranged on the primary air inlet pipe, and a swirl vane is arranged in the space.

[0013] According to the multi-modal working blast furnace gas oxygen-enriched burner, the secondary combustion-supporting system comprises a secondary air inlet pipe which is fixedly connected vertically to the sidewall of the shell, the secondary air inlet pipe communicates with the second zone in the shell, and a secondary air valve is arranged on the secondary air inlet pipe.

[0014] According to the multi-modal working blast furnace gas oxygen-enriched burner, the ignition unit comprises an ignition gun which is fixedly connected to the sidewall of the shell, a working end of the ignition gun extends into the primary precombustion pipe and is arranged correspondingly to the output end of the oxygen pipe.

[0015] According to the multi-modal working blast furnace gas oxygen-enriched burner, a plurality of oxygen injection holes are arranged on the output end of the oxygen pipe at equal intervals in the circumferential direction, and the included angle between the axis of the oxygen injection hole and the central axis of the oxygen pipe is 45°.

[0016] According to the multi-modal working blast furnace gas oxygen-enriched burner, a plurality of rows of blast furnace gas holes are arranged on the sidewall of one end of the primary precombustion pipe at equal intervals in the circumferential direction, and the first zone communicates with the inner cavity of the primary precombustion pipe through the blast furnace gas holes.

[0017] According to the multi-modal working blast furnace gas oxygen-enriched burner provided by the application, the partition plate is fixedly connected in the shell in the vertical direction, the partition plate divides the inside of the shell into the first interval and the second interval, a mounting hole is formed in the center position of the partition plate, and the first-stage precombustion pipe is fixedly connected in the mounting hole of the partition plate.

[0018] According to the multi-modal working blast furnace gas oxygen-enriched burner provided by the application, the temperature of the blast furnace gas in the first interval is 600-800 DEG C.

[0019] According to the multi-modal working blast furnace gas oxygen-enriched burner provided by the application, the shell is provided with a heat insulation layer on the outer wall of the end away from the sleeve.

[0020] The application discloses the following technical effects:

[0021] 1. The multi-modal working blast furnace gas oxygen-enriched burner provided by the application adopts a blast furnace gas preheating strategy, and the blast furnace gas preheating uses a heat accumulation type combustion mode, which improves the combustion temperature and reduces the temperature of the outlet gas, thereby improving the energy utilization efficiency.

[0022] 2. The multi-modal working blast furnace gas oxygen-enriched burner provided by the application adopts a staged combustion strategy, and uses oxygen and first-stage air to participate in first-stage combustion and uses second-stage air to participate in second-stage combustion, and the proportion of oxygen provided by the first-stage and second-stage combustion-supporting gases can be adjusted within a certain range.

[0023] 3. The multi-modal working blast furnace gas oxygen-enriched burner has multiple working modes, and the combustion-supporting gases can be divided into pure air, pure oxygen and oxygen-enriched air in three different cases. For pure air combustion-supporting, oxygen is prevented from entering to participate in combustion through the first combustion-supporting unit; for pure oxygen combustion-supporting, air is prevented from entering to participate in combustion through the second combustion-supporting unit and the second-stage combustion-supporting system; for oxygen-enriched air combustion-supporting, appropriate oxygen and first-stage air are controlled to enter the first-stage precombustion pipe to participate in first-stage combustion through the first combustion-supporting unit and the second combustion-supporting unit respectively, and appropriate second-stage air is controlled to participate in second-stage combustion through the second-stage combustion-supporting system, and the oxygen enrichment degree is determined by the oxygen flow controlled by the first combustion-supporting unit. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings in the following description only show some embodiments of the application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0025] Figure 1It is a structural schematic view of the multi-modal working blast furnace gas oxygen-enriched burner.

[0026] 1, oxygen pipe; 2, sleeve; 3, oxygen valve; 4, oxygen injection hole; 5, swirl vane; 6, primary air inlet pipe; 7, primary air valve; 8, blast furnace gas inlet pipe; 9, secondary air inlet pipe; 10, secondary air valve; 11, primary pre-combustion pipe; 12, blast furnace gas hole; 13, first interval; 14, partition; 15, second interval; 16, heat insulation layer; 17, ignition gun; 18, shell. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0028] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0029] Reference Figure 1 The present application provides a multi-modal working blast furnace gas oxygen-enriched burner, comprising:

[0030] The shell 18 is coaxially and fixedly connected with the primary pre-combustion pipe 11, and a space is arranged between the primary pre-combustion pipe 11 and the inner wall of the shell 18. The shell 18 is vertically divided into the first interval 13 and the second interval 15. The outer wall of the shell 18 is fixedly connected with the blast furnace gas inlet pipe 8, and the blast furnace gas inlet pipe 8 communicates with the first interval 13.

[0031] The primary combustion supporting system comprises a first combustion supporting unit and a second combustion supporting unit. The first combustion supporting unit penetrates through the shell 18 and extends into the primary pre-combustion pipe 11. The second combustion supporting unit is vertically fixedly connected with the first combustion supporting unit and communicates with the first combustion supporting unit.

[0032] The secondary combustion supporting system is fixedly connected with the outer side wall of the shell 18 and communicates with the second interval 15 in the shell 18.

[0033] The ignition unit is arranged on the shell 18. The working end of the ignition unit extends into the primary pre-combustion pipe 11 and is correspondingly arranged with the first combustion supporting unit.

[0034] The first interval 13 communicates with the inner cavity of the primary pre-combustion pipe 11. One end of the primary pre-combustion pipe 11 located in the second interval 15 is arranged as an open end.

[0035] Further optimization scheme, the first combustion-supporting unit comprises a sleeve 2 which passes through the shell and extends into the first pre-combustion pipe 11, the sleeve 2 is coaxially arranged with the shell 18, the sleeve 2 is fixedly connected with the first pre-combustion pipe 11 and the shell 18, the shell 18 is coaxially fixedly connected with the oxygen pipe 1, the output end of the oxygen pipe 1 extends into the first pre-combustion pipe 11 and is arranged corresponding to the ignition unit, a space is arranged between the oxygen pipe 1 and the sleeve 2, and the oxygen valve 3 is arranged on the oxygen pipe 1.

[0036] In the embodiment, various combustion working modes are provided, and the combustion-supporting gas can be divided into three different cases of pure air, pure oxygen and oxygen-enriched air. For pure air combustion-supporting, the oxygen valve 3 is controlled to prevent oxygen from entering the combustion; for pure oxygen combustion-supporting, the first air valve 7 and the second air valve 10 are controlled to prevent air from entering the combustion; for oxygen-enriched air combustion-supporting, the oxygen valve 3 and the first air valve 7 are controlled to allow appropriate oxygen and first air to enter the first interval 13 of the first pre-combustion pipe 11, and the second air valve 10 is controlled to allow appropriate second air to participate in the second combustion, and the oxygen-enriched degree is determined by the oxygen flow controlled by the oxygen valve 3.

[0037] Further optimization scheme, the second combustion-supporting unit comprises a first air inlet pipe 6 which is fixedly connected to the side wall of the sleeve 2, the first air inlet pipe 6 is in communication with the space between the oxygen pipe 1 and the sleeve 2, the first air valve 7 is arranged on the first air inlet pipe 6, and the swirl vane 5 is arranged in the space.

[0038] The swirl vane 5 is arranged between the oxygen pipe 1 and the sleeve 2, so that the first air enters the first pre-combustion pipe 11 in the form of swirl injection, the mixing effect of the first air and the blast furnace gas is enhanced, the combustion temperature is improved, the first flame rigidity is increased, and the first flame length is increased.

[0039] Further optimization scheme, the second combustion-supporting system comprises a second air inlet pipe 9 which is fixedly connected to the side wall of the shell 18, the second air inlet pipe 9 is in communication with the second interval 15 in the shell 18, and the second air valve 10 is arranged on the second air inlet pipe 9.

[0040] Further optimization scheme, the ignition unit comprises an ignition gun 17 which is fixedly connected to the side wall of the shell 18, and the working end of the ignition gun 17 extends into the first pre-combustion pipe 11 and is arranged corresponding to the output end of the oxygen pipe 1.

[0041] Further optimization scheme, a plurality of oxygen injection holes 4 are formed on the output end of the oxygen pipe 1 at equal intervals in the circumferential direction, and the included angle between the axis of the oxygen injection hole 4 and the central axis of the oxygen pipe 1 is 45°. The number of oxygen injection holes 4 is preferably 8.

[0042] Further optimization scheme, the first stage precombustion pipe 11 is located in the first interval 13 one end of the side wall of the circumference is opened with several columns of blast furnace gas hole 12, the first interval 13 with the inner cavity of first stage precombustion pipe 11 is communicated through blast furnace gas hole 12.

[0043] The first stage precombustion pipe 11 upper arrangement has a large number of blast furnace gas hole 12, blast furnace gas from blast furnace gas inlet pipe 8 into the first interval 13, through blast furnace gas hole 12 multiple into first stage precombustion pipe 11, with the first stage combustion-supporting gas is ignited by ignition gun 17.

[0044] Further optimization scheme, the shell 18 is vertically fixedly connected with the partition 14, the partition 14 divides the shell 18 into first interval 13 and second interval 15, the partition 14 center position is provided with mounting hole, the first stage precombustion pipe 11 is fixedly connected in the mounting hole of partition 14.

[0045] Further optimization scheme, the blast furnace gas inlet pipe 8 is connected into the first interval 13 of blast furnace gas temperature is 600-800 DEG C.

[0046] Further optimization scheme, the shell 18 is away from the outer wall of sleeve 2 one end is provided with heat insulation layer 16. Heat insulation layer 16 uses refractory material pouring and is formed.

[0047] Specific working process:

[0048] Oxygen is controlled by oxygen valve 3 from the oxygen gas jet 4 of oxygen pipe 1 end high speed into the first stage precombustion pipe 11, the first stage air is controlled by the first stage air valve 7 from the first stage air inlet pipe 6 into the oxygen pipe 1 and the air gap of sleeve 2, through the cyclone piece 5 with strong cyclone form into the first stage precombustion pipe 11, after preheating to 600-800 DEG C blast furnace gas from blast furnace gas inlet pipe 8 into the first interval 13, oxygen, first stage air, blast furnace gas is diffused and mixed in the first interval 13, is ignited by ignition gun 17, generates first stage flue gas, first stage flue gas from the first interval 13 end high speed into the second interval 15; Second stage air is controlled by the second stage air valve 10 from the second stage air inlet pipe 9 into the second interval 15, and the first stage flue gas is mixed and combusted after heat release.

[0049] The oxygen valve 3, the primary air valve 7 and the secondary air valve 10 are adjusted to adjust the flow of oxygen, primary air and secondary air respectively, so as to control the oxygen enrichment degree of the combustion-supporting gas. For example, in the case of pure oxygen combustion-supporting, the oxygen valve 3 controls all the oxygen required for combustion to be provided by the oxygen pipe 1, and the primary air valve 7 and the secondary air valve 10 control the prohibition of the primary air and the secondary air from entering the burner; in the case of pure air combustion-supporting, the primary air valve 7 and the secondary air valve 10 control all the oxygen required for combustion to be provided by the primary air and the secondary air, and the oxygen valve 3 controls the prohibition of pure oxygen from entering the burner; in the case of oxygen-enriched air combustion-supporting, the oxygen valve 3, the primary air valve 7 and the secondary air valve 10 control part of all the oxygen required for combustion to be provided by the pure oxygen through the oxygen pipe 1, and the other part to be provided by the air through the primary air inlet pipe 6 and the secondary air inlet pipe 9, and the specific oxygen enrichment degree is determined by the flow ratio of the pure oxygen, the primary air and the secondary air.

[0050] In the description of the present application, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0051] The above-described embodiments are only descriptions of the preferred modes of the present application, and do not limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements to the technical solutions of the present application made by those skilled in the art shall fall within the protection scope determined by the claims of the present application.

Claims

1. A multi-modal high work blast furnace gas oxy-combustor characterized in that, The utility model relates to a kind of high-temperature air supply system of blast furnace, including: Shell (18), the shell (18) is coaxially fixedly connected with primary precombustion tube (11), interval is arranged between the shell (18) inner wall and the primary precombustion tube (11), the shell (18) is vertically divided into first interval (13) and second interval (15) in, the outer wall of the shell (18) is fixedly connected with blast furnace gas inlet pipe (8), and the blast furnace gas inlet pipe (8) is communicated with the first interval (13); Primary combustion-supporting system, the primary combustion-supporting system includes first combustion-supporting unit and second combustion-supporting unit, the first combustion-supporting unit passes through the shell (18) and extends into the primary precombustion tube (11), and the second combustion-supporting unit is vertically fixedly connected on the first combustion-supporting unit, and the second combustion-supporting unit is communicated with the first combustion-supporting unit; Secondary combustion-supporting system, the secondary combustion-supporting system is fixedly connected on the outer side wall of the shell (18), and is communicated with the second interval (15) in the shell (18); Ignition unit, the ignition unit is arranged on the shell (18), and the working end of the ignition unit extends into the primary precombustion tube (11) and is correspondingly arranged with the first combustion-supporting unit; Wherein, the first interval (13) is communicated with the inner cavity of the primary precombustion tube (11), and one end of the primary precombustion tube (11) in the second interval (15) is arranged as open mouthed; The first combustion-supporting unit includes sleeve pipe (2), the sleeve pipe (2) passes through the shell (18) and extends into the primary precombustion tube (11), the sleeve pipe (2) is coaxially arranged with the shell (18), the sleeve pipe (2) is fixedly connected with the primary precombustion tube (11), the shell (18), the shell (18) is coaxially fixedly connected with oxygen pipe (1), the output end of the oxygen pipe (1) extends into the primary precombustion tube (11) and is correspondingly arranged with the ignition unit, interval is arranged between the oxygen pipe (1) and the sleeve pipe (2), and oxygen valve (3) is arranged on the oxygen pipe (1); The second combustion-supporting unit includes primary air inlet pipe (6) that is vertically fixedly connected on the side wall of the sleeve pipe (2), and the primary air inlet pipe (6) is communicated with the interval between the oxygen pipe (1) and the sleeve pipe (2), and primary air valve (7) is arranged on the primary air inlet pipe (6), and cyclone piece (5) is installed in the interval; The secondary combustion-supporting system includes secondary air inlet pipe (9) that is vertically fixedly connected on the side wall of the shell (18), and the secondary air inlet pipe (9) is communicated with the second interval (15) in the shell (18), and secondary air valve (10) is arranged on the secondary air inlet pipe (9).

2. A multi-modal operating blast furnace gas oxygen enriched burner as claimed in claim 1, wherein: The ignition unit includes ignition gun (17) that is fixedly connected on the side wall of the shell (18), and the working end of the ignition gun (17) extends into the primary precombustion tube (11) and is correspondingly arranged with the output end of the oxygen pipe (1).

3. A multi-modal operating blast furnace gas oxygen enriched burner as claimed in claim 1, wherein: The output end of the oxygen pipe (1) is provided with a plurality of oxygen injection holes (4) at equal intervals in the circumferential direction, and the included angle between the axis of the oxygen injection hole (4) and the central axis of the oxygen pipe (1) is 45°.

4. A multi-modal operating blast furnace gas oxygen enriched burner as claimed in claim 1, wherein: The first-stage pre-combustion pipe (11) is provided with a plurality of blast furnace gas holes (12) at equal intervals in the circumferential direction on the side wall of one end in the first interval (13), and the first interval (13) is communicated with the inner cavity of the first-stage pre-combustion pipe (11) through the blast furnace gas hole (12).

5. A multi-modal operating blast furnace gas oxygen enriched burner as claimed in claim 1, wherein: A partition plate (14) is fixedly connected in the shell (18) in the vertical direction, the shell (18) is divided into the first interval (13) and the second interval (15) by the partition plate (14), the partition plate (14) is provided with a mounting hole at the central position, and the first-stage pre-combustion pipe (11) is fixedly connected in the mounting hole of the partition plate (14).

6. A multi-modal operating blast furnace gas oxygen enriched burner as claimed in claim 1, wherein: The temperature of the blast furnace gas in the first interval (13) into which the blast furnace gas inlet pipe (8) is communicated is 600-800 DEG C.

7. A multi-modal operating blast furnace gas oxygen enriched burner as claimed in claim 1, wherein: The outer wall of the shell (18) away from one end of the sleeve (2) is provided with a heat insulation layer (16).

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