Acid gas burner

Abstract

The invention discloses an acid gas burner which comprises a cylindrical body shell, a combustion chamber built by refractory bricks is arranged on the upper portion of an inner cavity of the body shell, an air inlet communicated with the inner cavity is welded to the side face of the body shell, and an ignition rod inserted into the combustion chamber is installed on the side face of the body shell. An axially-penetrating outer pipe is fixedly mounted at the tail of the body shell, a concentric inner pipe is fixedly mounted at the tail of the outer pipe, a gas spray gun is inserted into the inner pipe upwards from the tail, a concentric rotational flow nozzle is fixedly mounted at the top end of the outer pipe and comprises a cylindrical base, each rotational flow blade is provided with an exhaust hole extending to the base from the top, and the exhaust holes are communicated with the base. The upper end of the inner pipe is located in the middle of the swirl nozzle, a big-end-down taper hole is formed in the bottom of the combustion chamber, the swirl nozzle is inserted into the taper hole, and an acid gas inlet is welded to the side face of the tail of the outer pipe. According to the burner, stable flame is formed at the nozzle, acid gas is better and efficiently treated, and the problems that mixing is not good and tempering is prone to occurring are solved.

Description

Technical Field

[0001] The invention relates to the technical field of burners, in particular to an acid gas burner. Background Art

[0002] With the development of large-scale chemical industry and diversified raw materials, the gas to be treated is becoming more and more complex. Among them, acid gas burners are often used in chemical production processes related to sulfur recovery. In the sulfur recovery acid production process, the sulfur contained in the acid gas is oxidized to sulfur dioxide by high-temperature incineration. This process belongs to the oxygen-deficient reaction process to ensure that the products generated by the incomplete combustion reaction of the acid gas are further oxidized to sulfur trioxide in the subsequent process section to make finished sulfuric acid, thereby realizing the recovery of sulfur in the waste gas. In this process, the acid gas combustion reaction is relatively slow. Generally, the acid gas combustion adopts a premixing structure to obtain a high and short flame intensity, which is more conducive to the reaction of the acid gas. For example, patent announcement number CN218846158U discloses a new type of low-pressure acid gas burner and its application device, which cools and protects various gas guns from high temperature damage, and pushes the flame from the burner into the incinerator, thereby avoiding the flame burning the burner, and providing oxygen to ensure full combustion, but this burner is prone to flashback due to the premixing characteristics at low load, resulting in head burn damage. Summary of the invention

[0003] The object of the present invention is to provide an acid gas burner to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the invention provides the following technical solutions: an acid gas burner, comprising a cylindrical body shell, a combustion chamber made of refractory bricks is arranged on the upper part of the inner cavity of the body shell, the combustion chamber is a cylindrical cavity, an air inlet connected to the inner cavity is welded on the side of the body shell, an ignition rod inserted into the combustion chamber is installed on the side of the body shell, an axially penetrating outer tube is fixedly installed at the tail of the body shell, a concentric inner tube is fixedly installed at the tail of the outer tube, a gas spray gun is inserted into the inner tube from the tail upward, a concentric swirl nozzle is fixedly installed at the top of the outer tube, the swirl nozzle comprises a cylindrical base, a plurality of swirl blades are evenly arranged on the base along the circumference, each of the swirl blades is provided with an exhaust hole extending from the top to the base, the upper end of the inner tube is located in the middle of the swirl nozzle, a tapered hole with a small top and a large bottom is arranged at the bottom of the combustion chamber, the swirl nozzle is inserted into the tapered hole, and an acid gas inlet is welded on the side of the tail of the outer tube.

[0005] Preferably, a concentric air distribution cylinder is fixedly installed in the inner cavity of the main body shell, and circular holes are distributed on the circumferential surface of the air distribution cylinder, and the diameter of the air distribution cylinder is larger than the diameter of the lower end of the tapered hole.

[0006] Preferably, a plurality of flame detectors facing obliquely upward are installed along the circumference of the side surface of the combustion chamber.

[0007] Preferably, the angle A between the conical surface of the conical hole and the axis is 25-40°, and the swirl angle of the swirl nozzle 10 is 23-30°.

[0008] Compared with the prior art, the beneficial effects of the invention are as follows: the air and the acid gas are intensifiedly mixed at the nozzle under the action of the swirl nozzle, so that the burner forms a stable flame at the nozzle, and the acid gas is better and more efficiently treated, which well solves the problem of poor mixing and easy flashback of the acid gas burner. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the side section structure of the invention;

[0010] Figure 2 It is a side structural schematic diagram of the invention;

[0011] Figure 3 It is a schematic diagram of the structure of the swirl nozzle.

[0012] In the figure: 1. body shell; 2. air inlet; 3. refractory bricks; 4. combustion chamber; 5. flame detector; 6. air distribution tube; 7. outer pipe; 8. acid gas inlet; 9. inner pipe; 10. swirl nozzle; 11. exhaust hole; 12. ignition rod; 13. gas spray gun. DETAILED DESCRIPTION

[0013] The technical solutions in the embodiments of the invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the invention. Obviously, the described embodiments are only part of the embodiments of the invention, rather than all of the embodiments.

[0014] See also Figure 1-3The invention provides a technical solution: an acid gas burner, comprising a cylindrical body shell 1, a combustion chamber 4 made of refractory bricks 3 is arranged on the upper part of the inner cavity of the body shell 1, and the combustion chamber 4 is a cylindrical cavity, and the acid gas is ignited and burned in the combustion chamber 4. An air inlet 2 connected to the inner cavity is welded on the side of the body shell 1, an ignition rod 12 inserted into the combustion chamber 4 is installed on the side of the body shell 1, and a plurality of flame detectors 5 obliquely upward are installed along the circumference of the side of the combustion chamber 4. The flame detector 5 is a mature product on the market and is used to detect the state of combustion. An axially penetrating outer tube 7 is fixedly installed at the tail of the main body shell 1, and a concentric inner tube 9 is fixedly installed at the tail of the outer tube 7. A gas spray gun 13 is inserted into the inner tube 9 from the tail upward. The gas spray gun 13 is used for ignition starting and supplementary combustion under low working conditions. A concentric air distribution cylinder 6 is fixedly installed in the inner cavity of the main body shell 1. Circular holes are distributed on the circumferential surface of the air distribution cylinder 6. The diameter of the air distribution cylinder 6 is larger than the diameter of the lower end of the tapered hole. The incoming air is evenly diffused through the air distribution cylinder 6.

[0015] A concentric swirl nozzle 10 is fixedly installed at the top of the outer tube 7. The swirl nozzle 10 includes a cylindrical base, on which a plurality of swirl blades are evenly arranged along the circumference. The swirl angle of the swirl nozzle 10 is 23-30°, and each swirl blade is provided with an exhaust hole 11 extending from the top to the base. The upper end of the inner tube 9 is located in the middle of the swirl nozzle 10. A tapered hole with a small top and a large bottom is provided at the bottom of the combustion chamber 4. The angle A between the cone surface of the tapered hole and the axis is 25-40°. The swirl nozzle 10 is inserted into the tapered hole. An acid gas access port 8 is welded to the side of the tail of the outer tube 7. The air passes through the swirl blades to form a strong turbulence and is well mixed with the acid gas ejected from the exhaust hole 11, so as to achieve combustion with air support. The acid gas and air are mixed in the combustion chamber 4, which can well prevent backfire and improve safety.

[0016] Although embodiments of the invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the invention, and the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An acid gas burner, comprising a cylindrical main body shell (1), a combustion chamber (4) made of refractory bricks (3) is arranged on the upper part of the inner cavity of the main body shell (1), the combustion chamber (4) is a cylindrical cavity, an air inlet (2) communicating with the inner cavity is welded on the side of the main body shell (1), an ignition rod (12) inserted into the combustion chamber (4) is installed on the side of the main body shell (1), and the characteristics are: An axially penetrating outer tube (7) is fixedly mounted at the tail of the main body shell (1), a concentric inner tube (9) is fixedly mounted at the tail of the outer tube (7), a gas spray gun (13) is inserted upward from the tail of the inner tube (9), a concentric swirl nozzle (10) is fixedly mounted at the top of the outer tube (7), the swirl nozzle (10) comprises a cylindrical base, a plurality of swirl blades are evenly arranged along the circumference of the base, each of the swirl blades is provided with an exhaust hole (11) extending from the top to the base, the upper end of the inner tube (9) is located in the middle of the swirl nozzle (10), a tapered hole with a small top and a large bottom is provided at the bottom of the combustion chamber (4), the swirl nozzle (10) is inserted into the tapered hole, and an acid gas inlet (8) is welded to the side of the tail of the outer tube (7).

2. The acid gas burner according to claim 1, characterized in that: A concentric air distribution cylinder (6) is fixedly mounted in the inner cavity of the main body shell (1), and circular holes are distributed on the circumferential surface of the air distribution cylinder (6). The diameter of the air distribution cylinder (6) is greater than the diameter of the lower end of the tapered hole.

3. The acid gas burner according to claim 1, characterized in that: A plurality of flame detectors (5) obliquely upward are installed along the circumference of the side surface of the combustion chamber (4).

4. The acid gas burner according to claim 1, characterized in that: The angle A between the conical surface of the conical hole and the axis is 25 to 40 degrees, and the swirl angle of the swirl nozzle (10) is 23 to 30 degrees.

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