Heat accumulating type combustor and gas system

Abstract

The utility model relates to a heat accumulating type burner and gas system, including heat accumulating box, transmission channel, compensation structure, blowhole and structural member, compensation structure includes a plurality of entrainment mouth, a plurality of entrainment mouth all communicate with the transmission channel, and the one end of entrainment mouth far away from transmission channel passes through and extends to the left side of heat accumulating box. According to the heat accumulating type combustor and the fuel gas system, a back-blowing nozzle is additionally arranged in a coal gas heat accumulating box, on the smoke discharging side when the coal gas heat accumulating box conducts reversing combustion at the interval of 30 seconds to 90 seconds, coal gas used for combustion of the previous working condition in the heat accumulating box 1 is firstly back-blown into a combustion chamber to be combusted through the back-blowing nozzle 302 at the initial stage, and then the coal gas is combusted through the back-blowing nozzle 302; after combustion, the smoke discharging side enters the smoke discharging and heat storage working condition, gas is saved through back flushing of coal gas, meanwhile, it is guaranteed that flames in the combustion chamber are evenly distributed and combusted sufficiently, the combustion efficiency is improved, and meanwhile harm to personal safety and environmental pollution caused by emission of CO, CH4 and the like in the coal gas is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of regenerative burners, in particular to a regenerative burner and a gas system. Background Technique

[0002] Regenerative burners are very commonly used in industries such as metallurgy, machinery, and non-ferrous metals. However, due to industry or regional restrictions, some enterprises need to use burners with different calorific values at different stages. Generally, high-calorific-value gas (such as natural gas) is used with single regenerative burners, and medium- and low-calorific-value gas (such as producer gas and blast furnace gas) is used with double regenerative burners. If the form of the burner needs to be changed, the enterprise needs to stop production to replace the burner and change the pipeline, which brings great economic losses to the enterprise.

[0003] Regenerative burners are basically applied to heating furnaces with a furnace temperature of about 900 - 1350 °C. The air coefficient is selected to be 1.05 - 1.2, and over-oxygen high-temperature combustion is realized in the furnace. A large amount of nitrogen oxides are generated in this range. At the same time, as the furnace temperature increases, the generation amount of nitrogen oxides increases exponentially, causing irreversible pollution to the environment.

[0004] For the coal nozzles applying double regeneration, it is necessary to conduct commutation combustion at intervals of 30 - 90 seconds. At each commutation instant, a large amount of gas (such as CO, CH4, etc.) is discharged into the atmosphere through the gas regenerative burner, resulting in energy waste and environmental pollution. At the same time, CO is a colorless and odorless highly toxic gas. After inhalation by humans, it can cause dizziness or death.

[0005] In recent years, some newly built projects have considered using a dual-fuel system in the design, including slightly adjusting the regenerative burner and the pipeline system to increase the nozzles applicable to high-calorific-value natural gas. At the same time, a switching device has also been designed so that the gas regenerative box can be switched to an air regenerative box, thus combining with the natural gas nozzles to form a single combustion system.

[0006] However, due to the relatively fast combustion speed of natural gas, this unilateral mixing combustion method is not conducive to the effective mixing combustion of natural gas. In practical applications, this may lead to problems such as the flame skewing to one side, uneven furnace temperature, incomplete combustion, and carbon deposition at the nozzles. These problems further affect the combustion efficiency of the heating furnace system, increase the oxidation loss of the billets, and result in negative impacts such as poor heating uniformity. Content of the Utility Model

[0007] Aiming at the deficiencies of the prior art, the utility model provides a regenerative burner and a gas system, which solve the problems of affecting the combustion efficiency of the heating furnace system, increasing the oxidation loss of steel billets, and resulting in negative impacts such as poor heating uniformity.

[0008] To achieve the above object, the present utility model provides the following technical solutions: A regenerative burner, comprising a heat storage box, a transmission channel, a compensation structure, jet holes, and structural members;

[0009] The transmission channel is installed horizontally inside the heat storage box, the compensation structure is communicated with the transmission channel, the jet holes are opened on the left side of the heat storage box and are communicated with the transmission channel.

[0010] Further, the compensation structure includes a plurality of entrainment ports, and the plurality of entrainment ports are all communicated with the transmission channel, and one end of the entrainment port far from the transmission channel penetrates and extends to the left side of the heat storage box.

[0011] Further, the number of the plurality of entrainment ports is four, and the four entrainment ports are annularly arranged on the left side of the heat storage box.

[0012] Further, the number of the jet holes is several, and the shape of the jet holes is circular;

[0013] The jet holes are located inside the plurality of entrainment ports.

[0014] Further, the compensation structure further includes a back-blowing jet port communicated with the transmission channel.

[0015] Further, the back-blowing jet port is vertically arranged outside the transmission channel and is located on the right side of the heat storage box.

[0016] Further, the number of the jet holes is at least one, and they are arranged at intervals up and down, and the shape of the jet holes is a waist-shaped hole.

[0017] Further, the structural member includes a high calorific value gas transmission pipe, the high calorific value gas transmission pipe is communicated inside the heat storage box, and one end of the high calorific value gas transmission pipe penetrates and extends to the left side of the heat storage box, and a high temperature resistant steel pipe is sleeved outside the high calorific value gas transmission pipe.

[0018] Further, there is a certain gap between the high temperature resistant steel pipe and the high calorific value gas transmission pipe for introducing cold air to protect the high calorific value gas transmission pipe.

[0019] A regenerative gas system, which includes the burner described in any one of the above.

[0020] Compared with the prior art, the technical solutions of the present application have the following beneficial effects:

[0021] The regenerative burner and gas system add a backflush nozzle in the gas regenerator. During the smoke exhaust side when the gas regenerator changes combustion direction at intervals of 30 - 90 seconds, initially, the gas for combustion in the previous working condition existing in the regenerator is backflushed through the backflush nozzle into the combustion chamber for combustion. After combustion, the smoke exhaust side then enters the smoke storage and heat regeneration working condition. The backflushed gas not only saves gas but also ensures uniform flame distribution and sufficient combustion inside the combustion chamber, increases the combustion efficiency, and at the same time avoids the hazards to personal safety and environmental pollution caused by the emissions of CO, CH4, etc. in the gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of the high - calorific - value gas combustion regenerator of the present utility model;

[0023] Figure 2 is a left - view schematic diagram of the high - calorific - value gas combustion structure of the present utility model;

[0024] Figure 3 is a schematic structural diagram of the medium - and low - calorific - value gas combustion regenerator of the present utility model;

[0025] Figure 4 is a left - view structural schematic diagram of the low - calorific - value gas combustion regenerator of the present utility model.

[0026] In the figure: 1, regenerator; 2, transmission channel; 3, compensation structure; 301, entrainment port; 302, backflush nozzle; 4, gas injection hole; 5, structural member; 501, high - calorific - value gas transmission pipe; 502, high - temperature - resistant steel pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0028] Embodiment 1:

[0029] Please refer to Figure 1-2 , a regenerative burner in this embodiment includes a regenerator 1, a transmission channel 2, a compensation structure 3, a gas injection hole 4, and a structural member 5; the transmission channel 2 is installed horizontally inside the regenerator 1, the compensation structure 3 is communicated with the transmission channel 2, the gas injection hole 4 is opened on the left side of the regenerator 1 and is communicated with the transmission channel 2.

[0030] During actual use, high-calorific-value gas is transported to the inside of the combustion chamber through the structural member 5. At the same time, air in the outside world is transported to the inside of the gas chamber through the transmission channel 2 via the air injection holes 4 to compensate for oxygen in the inside of the combustion chamber, so that the gas in the inside of the combustion chamber can burn effectively.

[0031] Furthermore, the compensation structure 3 includes a plurality of entrainment ports 301. The plurality of entrainment ports 301 are all communicated with the transmission channel 2, and one end of the entrainment port 301 far from the transmission channel 2 penetrates and extends to the left side of the regenerator 1. The number of the plurality of entrainment ports 301 is four, and the four entrainment ports 301 are arranged in an annular array on the left side of the regenerator 1.

[0032] During actual setting, a part of the high-temperature flue gas in the combustion chamber is sucked directly into the transmission channel 2 in the burner through the entrainment port 301 on the end face, reducing the oxygen concentration of the air and diluting the oxygen content in the air, that is, reducing from the original oxygen content of 21% to 10-19% or lower, but the total amount of oxygen for combustion remains unchanged. After the oxygen-deficient air enters the furnace, long-flame combustion can be achieved, reducing the flame temperature difference, and at the same time eliminating the generation of nitrogen oxides from the source.

[0033] In addition, in order to ensure the effective transmission of the high-calorific-value gas transmission pipe 501 and at the same time play a protective role for the high-calorific-value gas transmission pipe 501, the structural member 5 in this embodiment includes a high-calorific-value gas transmission pipe 501. The high-calorific-value gas transmission pipe 501 is communicated inside the regenerator 1, and one end of the high-calorific-value gas transmission pipe 501 penetrates and extends to the left side of the regenerator 1. A high-temperature-resistant steel pipe 502 is sleeved outside the high-calorific-value gas transmission pipe 501.

[0034] During actual setting, in the integrated air single regenerative burner, the high-calorific-value gas nozzle can directly open a hole on the end face of the burner, or a high-temperature-resistant steel pipe 502 can be set, and an annular pipe is arranged on the outer diameter, and cold air is introduced into the gap to protect the high-calorific-value gas transmission pipe 501.

[0035] The end-face entrainment port 301 sucks a part of the high-temperature flue gas in the furnace directly into the air collection channel in the burner, reducing the oxygen concentration of the air and diluting the oxygen content in the air, that is, reducing from the original oxygen content of 21% to 10-19% or lower, but the total amount of oxygen for combustion remains unchanged. After the oxygen-deficient air enters the furnace, long-flame combustion can be achieved, reducing the flame temperature difference, and at the same time eliminating the generation of nitrogen oxides from the source.

[0036] Furthermore, in order to increase the efficiency of air transmission to the inside of the combustion chamber, the number of the air injection holes 4 in this embodiment is several, and the shape of the air injection holes 4 is circular; the air injection holes 4 are located inside the plurality of entrainment ports 301.

[0037] In actual setting, the air jet holes 4 can also be designed as rectangles. The air jet holes 4 are decomposed into multiple small nozzles, and the method of multi-strand air flow is adopted to reduce the air supply concentration to reduce the local high temperature of flame combustion, and eliminate the generation of nitrogen oxides from the source.

[0038] Embodiment 2:

[0039] Please refer to Figure 3-4 , a regenerative burner in this embodiment includes a regenerative box 1, a transmission channel 2, a compensation structure 3 and air jet holes 4; the transmission channel 2 is installed horizontally inside the regenerative box 1, the compensation structure 3 is communicated with the transmission channel 2, and the air jet holes 4 are opened on the left side of the regenerative box 1 and communicated with the transmission channel 2.

[0040] During the actual use process, air and medium and low calorific value gas in the outside world are transported to the inside of the gas chamber through the transmission channel 2 and the air jet holes 4 to compensate oxygen inside the combustion chamber, so that the gas inside the combustion chamber can burn effectively.

[0041] Preferably, in order to save gas and avoid the harm to personal safety and environmental pollution caused by the emissions of CO, CH4, etc. in the gas, the compensation structure 3 in this embodiment further includes a back-blowing nozzle 302 communicated with the transmission channel 2, and the back-blowing nozzle 302 is vertically arranged outside the transmission channel 2 and located on the right side of the regenerative box 1.

[0042] In actual setting, in the gas regenerative box, the back-blowing nozzle 302 is added. When the gas regenerative box changes the combustion direction at intervals of 30-90 seconds on the smoke exhaust side, initially the gas used for combustion in the previous working condition existing in the regenerative box 1 is back-blown into the combustion chamber through the back-blowing nozzle 302 for combustion. After combustion, the smoke exhaust side enters the smoke exhaust and heat storage working condition. The back-blown gas not only saves gas, but also avoids the harm to personal safety and environmental pollution caused by the emissions of CO, CH4, etc. in the gas.

[0043] Furthermore, the number of the air jet holes 4 is at least one, and they are arranged at intervals up and down. The shape of the air jet holes 4 is a waist-shaped hole. By adopting the waist-shaped hole, the cross-sectional area in contact with air is increased to improve the gas utilization efficiency.

[0044] In summary, according to the process requirements, the air jet holes 4 and the gas nozzles can be designed as straight nozzles, or the air and gas intersecting nozzles with a certain angle. The burner can eliminate the emissions of nitrogen oxides and CO, CH4 in the gas from the source. The ultra-low emissions are not only beneficial to environmental protection, but also necessary for personal safety protection.

[0045] A regenerative gas system includes the burner in any one of the above.

[0046] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A regenerative burner, characterized in that: It comprises a heat storage box (1), a transmission channel (2), a compensation structure (3), an air injection hole (4) and a structural member (5); The transmission channel (2) is installed laterally inside the heat storage tank (1), the compensation structure (3) is connected to the transmission channel (2), and the injection hole (4) is opened on the left side of the heat storage tank (1) and is connected to the transmission channel (2).

2. A regenerative burner according to claim 1, characterized in that: The compensation structure (3) comprises a plurality of suction openings (301), the plurality of suction openings (301) are all connected to the transmission channel (2), and one end of the suction opening (301) away from the transmission channel (2) penetrates and extends to the left side of the heat storage tank (1).

3. A regenerative burner according to claim 2, characterized in that: The number of the plurality of suction openings (301) is four, and the four suction openings (301) are arranged in a circular shape and arranged in a row on the left side of the heat storage tank (1).

4. A regenerative burner according to claim 2, characterized in that: The number of the air jet holes (4) is several, and the shape of the air jet holes (4) is circular; The air injection holes (4) are located inside the plurality of suction ports (301).

5. A regenerative burner according to claim 1, characterized in that: The compensation structure (3) also includes a backflush nozzle (302) connected to the transmission channel (2).

6. A regenerative burner according to claim 5, characterized in that: The back-blowing nozzle (302) is vertically arranged on the outside of the transmission channel (2) and is located on the right side of the heat storage box (1).

7. A regenerative burner according to claim 1, characterized in that: The number of the air jet hole (4) is at least one, and the air jet hole (4) is arranged at intervals up and down, and the shape of the air jet hole (4) is a waist-shaped hole.

8. A regenerative burner according to claim 1, characterized in that: The structural member (5) comprises a high calorific value gas transmission pipe (501), the high calorific value gas transmission pipe (501) is connected to the interior of the heat storage tank (1), and one end of the high calorific value gas transmission pipe (501) passes through and extends to the left side of the heat storage tank (1), and a high temperature resistant steel pipe (502) is sleeved on the outer side of the high calorific value gas transmission pipe (501).

9. A regenerative burner according to claim 8, characterized in that: A certain gap is reserved between the high temperature resistant steel pipe (502) and the high calorific value coal gas transmission pipe (501) for letting in cold air to protect the high calorific value coal gas transmission pipe (501).

10. A thermal storage gas system, characterized in that: The burner comprises the burner according to any one of claims 1 to 9.

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