Self-cooling anti-coking double-fluid spray gun in high-temperature furnace

Abstract

The utility model relates to the technical field of double-fluid spray guns, in particular to a self-cooling anti-coking double-fluid spray gun in a high-temperature furnace. The self-cooling anti-coking double-fluid spray gun in the high-temperature furnace comprises a gun body and a furnace body, the gun body extends into the furnace body, a liquid-phase feeding pipe and a gas-phase sleeve are arranged in the gun body, the liquid-phase feeding pipe is located on the inner side of the gas-phase sleeve, a cooling liquid inner sleeve is arranged on the outer side of the gas-phase sleeve, a cooling liquid outer sleeve is arranged on the outer side of the cooling liquid inner sleeve, a spray nozzle is arranged on the gun body, and the spray nozzle is arranged on the furnace body. The nozzle is located inside the furnace body. The self-cooling principle is adopted, the surface temperature of the gun body in the furnace can be kept within the non-oxidation temperature range, the phenomenon of crystallization or coking blockage of materials in the gun body can be avoided, and the service life of the gun body is greatly prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of dual-fluid spray guns, in particular to a self-cooling and anti-coking dual-fluid spray gun in a high-temperature furnace. Background Art

[0002] At present, the denitrification and desulfurization technologies in the furnace all use a dual-fluid spray gun. This type of spray gun mainly mixes liquid materials and compressed air at the inlet of the spray gun, and then mixes and sprays them out at the nozzle through the gun body. The two materials are atomized and then sprayed into the interior of the kiln.

[0003] In actual use, it was found that when this type of spray gun is used for a long time, the liquid material contains substances that are easy to crystallize or coke, which are very likely to cause crystallization or coking blockage when passing through high-temperature parts. In addition, the gun body is in the furnace for a long time, and the surface is oxidized by high temperature, which greatly shortens its service life. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a self-cooling and anti-coking dual-fluid spray gun in a high-temperature furnace. By adopting the self-cooling principle, the surface temperature of the gun body in the furnace can be maintained within the non-oxidizing temperature range. The material in the gun body can not only avoid crystallization or coking blockage, but also greatly improve the service life of the gun body.

[0005] The utility model is realized by adopting the following technical solutions:

[0006] The self-cooling and anti-coking dual-fluid spray gun in a high-temperature furnace comprises a gun body and a furnace body. The gun body extends into the furnace body. A liquid phase feed pipe and a gas phase sleeve are arranged inside the gun body. The liquid phase feed pipe is located on the inner side of the gas phase sleeve. A coolant inner sleeve is arranged on the outer side of the gas phase sleeve. A coolant outer sleeve is arranged on the outer side of the coolant inner sleeve. A nozzle is arranged on the gun body, and the nozzle is located on the inner side of the furnace body.

[0007] The gas phase sleeve is located between the liquid phase feed pipe and the coolant inner sleeve, so that the coolant cools the gas phase while cooling the liquid phase fuel, while avoiding close contact between the coolant and the liquid phase fuel, preventing the liquid phase fuel from affecting the combustion efficiency in the furnace due to too low temperature.

[0008] The inner coolant sleeve is connected to a coolant inlet pipe, and the outer coolant sleeve is connected to a coolant outlet pipe.

[0009] The outer side of the coolant inner sleeve is connected with the coolant outer sleeve, and the connection point is located near the nozzle side.

[0010] A mixing section is provided between the gun body and the nozzle, and the mixing section connects the liquid phase feed pipe and the gas phase sleeve. The mixing section is located at the outlet of the gas phase sleeve and the liquid phase feed pipe, and is used for mixing the liquid phase and the gas phase in advance.

[0011] The liquid phase feed pipe is connected to a liquid phase feed port pipeline, and the gas phase casing is connected to a gas phase feed port pipeline.

[0012] The gas phase sleeve is provided with a cyclone generating port, which is located on one side of the nozzle. The cyclone generating port is used for the gas phase to be ejected from the outlet of the gas phase sleeve in a cyclone manner, so that the liquid phase is fully atomized and the combustion rate is improved.

[0013] The working principle of the utility model is:

[0014] The coolant enters the coolant inner sleeve through the coolant inlet pipe, and then returns to the cooling device through the coolant outer sleeve and the coolant outlet pipe, and pre-cools the gun body before the spray gun works; then, the gas phase enters the gas phase sleeve through the gas phase feed port pipe, and the liquid phase fuel enters the liquid phase feed pipe through the liquid phase feed port pipe; then, after being mixed in the mixing section, it is sprayed out at the nozzle into the furnace. Among them, the gas phase sleeve is located between the liquid phase feed pipe and the coolant inner sleeve, so that the coolant cools the gas phase while cooling the liquid phase fuel, and at the same time avoids close contact between the coolant and the liquid phase fuel, preventing the liquid phase fuel from affecting the working efficiency due to too low temperature.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] The utility model adopts the self-cooling and anti-coking double-fluid spray gun in a high-temperature furnace. By adopting the self-cooling principle, the surface temperature of the gun body in the furnace can be maintained within the non-oxidizing temperature range. The material in the gun body can not only avoid crystallization or coking blockage, but also greatly improve the service life of the gun body. The utility model solves the problems of high-temperature damage to the spray gun during use, and coking of the denitrification reducing agent or desulfurization agent in the spray gun, especially the coking in the spray gun, which will seriously block the internal spray pipe of the spray gun, causing the spray gun to stop working, so that the emission of smoke cannot meet the environmental protection requirements. The industrial kiln with a denitrification (SNCR) spray gun in a high-temperature furnace can still meet the required spray angle and dispersed atomization degree. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the self-cooling and anti-coking dual-fluid spray gun in a high-temperature furnace of the utility model;

[0018] Figure 2 It is a structural schematic diagram of the gun body of the utility model;

[0019] Figure 3 For this utility model Figure 2 Cross-sectional view at AA in the middle;

[0020] In the figure: 1. gun body; 2. furnace body; 3. nozzle; 4. liquid phase feed inlet pipeline; 5. gas phase feed inlet pipeline; 6. coolant outer casing; 7. coolant inner casing; 8. gas phase casing; 9. liquid phase feed pipe; 10. coolant outlet pipeline; 11. coolant inlet pipeline; 12. mixing section; 13. cyclone generation outlet. DETAILED DESCRIPTION

[0021] In order to make the purpose and technical solution of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings.

[0022] Example 1

[0023] like Figure 1 As shown, the self-cooling anti-coking dual-fluid spray gun in the high-temperature furnace includes a gun body 1 and a furnace body 2. The gun body 1 extends into the furnace body 2. Figure 2 As shown, a liquid-phase feed pipe 9 and a gas-phase sleeve 8 are provided inside the gun body 1, and the liquid-phase feed pipe 9 is located on the inner side of the gas-phase sleeve 8. A coolant inner sleeve 7 is provided on the outer side of the gas-phase sleeve 8, and a coolant outer sleeve 6 is provided on the outer side of the coolant inner sleeve 7. A nozzle 3 is provided on the gun body 1, and the nozzle 3 is located on the inner side of the furnace body 2. A coolant inlet pipe 11 is connected to the coolant inner sleeve 7, and a coolant outlet pipe 10 is connected to the coolant outer sleeve 6. The outer side of the coolant inner sleeve 7 is connected to the coolant outer sleeve 6, and the connecting part is located on the side close to the nozzle 3. A mixing section 12 is provided between the gun body 1 and the nozzle 3, and the mixing section 12 connects the liquid-phase feed pipe 9 and the gas-phase sleeve 8. The mixing section 12 is located at the discharge point of the gas-phase sleeve 8 and the liquid-phase feed pipe 9, and is used for early mixing of the liquid phase and the gas phase. The liquid-phase feed pipe 9 is connected to a liquid-phase feed port pipe 4, and the gas-phase sleeve 8 is connected to a gas-phase feed port pipe 5. As shown Figure 3 As shown, the gas phase sleeve 8 is provided with a cyclone generating port 13 , and the cyclone generating port 13 is located at one side of the nozzle 3 .

[0024] The above-mentioned self-cooling anti-coking dual-fluid spray gun in a high-temperature furnace, when in operation, comprises the following steps:

[0025] (1) Cooling water enters the coolant inner sleeve 7 through the coolant inlet pipe 11, and then returns to the cooling device through the coolant outer sleeve 6 and the coolant outlet pipe 10, so as to pre-cool the gun body 1 before the spray gun is ignited; (2) Then, the gas phase enters the gas phase sleeve 8 through the gas phase feed port pipe 5, and the liquid phase fuel enters the liquid phase feed pipe 9 through the liquid phase feed port pipe 4; (3) After being mixed in the mixing section 12, it is sprayed out at the nozzle 3 and ignited.

Claims

1. A self-cooling and anti-coking dual-fluid spray gun in a high-temperature furnace, characterized in that: The invention comprises a gun body (1) and a furnace body (2), wherein the gun body (1) extends into the furnace body (2), a liquid phase feed pipe (9) and a gas phase sleeve (8) are provided inside the gun body (1), the liquid phase feed pipe (9) is located inside the gas phase sleeve (8), a coolant inner sleeve (7) is provided outside the gas phase sleeve (8), a coolant outer sleeve (6) is provided outside the coolant inner sleeve (7), a nozzle (3) is provided on the gun body (1), and the nozzle (3) is located inside the furnace body (2); The gas phase casing (8) is provided with a cyclone generating port (13), and the cyclone generating port (13) is located on one side of the nozzle (3).

2. The self-cooling and anti-coking dual-fluid spray gun in a high-temperature furnace according to claim 1, characterized in that: The coolant inner sleeve (7) is connected to a coolant inlet pipe (11), and the coolant outer sleeve (6) is connected to a coolant outlet pipe (10).

3. The self-cooling and anti-coking dual-fluid spray gun in a high-temperature furnace according to claim 2, characterized in that: The outer side of the coolant inner sleeve (7) is connected to the coolant outer sleeve (6), and the connection point is located on the side close to the nozzle (3).

4. The self-cooling and anti-coking dual-fluid spray gun in a high-temperature furnace according to claim 1, characterized in that: A mixing section (12) is provided between the gun body (1) and the nozzle (3), and the mixing section (12) is connected to the liquid phase feed pipe (9) and the gas phase sleeve (8).

5. The self-cooling and anti-coking dual-fluid spray gun in a high-temperature furnace according to claim 1, characterized in that: The liquid phase feed pipe (9) is connected to a liquid phase feed port pipe (4), and the gas phase casing (8) is connected to a gas phase feed port pipe (5).

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