Gas single-phase rotational flow SNCR (selective non-catalytic reduction) denitration spray gun

Abstract

The utility model provides a gas single-phase rotational flow SNCR (selective non-catalytic reduction) denitration spray gun, which belongs to the technical field of flue gas denitration and comprises a main gas pipe, a gas inlet pipe is mounted at one end of the main gas pipe, an anti-abrasion nozzle is mounted at the other end of the main gas pipe, a cooling sleeve is sleeved on the main gas pipe, a heat insulation layer is mounted on the cooling sleeve, and a compressed air pipe is further connected onto the cooling sleeve. A compressed air connector is formed in one end of the compressed air pipe, a plurality of riflings are arranged on the inner side of the main air pipe, and the riflings are formed by alternately arranging negative lines and positive lines in a spiral shape. The rifling is carved in the main gas pipe, so that gas flow can be rotationally jetted, the problems of poor penetrability and poor mixing effect of gas flow beams of a traditional single-phase spray gun are greatly improved, the denitration efficiency of SNCR (selective non-catalytic reduction) is improved, meanwhile, the spray gun can be protected and prevented from being abraded at high temperature, the service life of the spray gun is prolonged, and the service life of the spray gun is prolonged. And the problem of abrasion caused by long-term operation is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas denitration, in particular to a gas single-phase swirl SNCR denitration spray gun. Background Art

[0002] The gas-liquid two-phase atomizing spray gun currently in use has the following disadvantages: (1) Low denitrification efficiency: The gas two-phase atomizing spray gun directly sprays fine droplets into the flue gas. The droplets evaporate first and absorb heat, causing the local temperature to drop, reducing the SNCR reaction temperature window; (2) Difficulty in maintenance and cleaning: The internal structure of the gas two-phase atomizing spray gun is relatively complex, making maintenance and cleaning more difficult, affecting the long-term use of the spray gun; (3) High energy consumption: In order to produce fine droplets, the gas two-phase atomizing spray gun requires higher gas and liquid pressures, which leads to higher energy consumption.

[0003] The single-phase atomizing spray guns currently in use also have the following disadvantages: (1) High gas consumption: In order to obtain a better mixing effect of the single-phase gas spray gun, a large amount of compressed air is required to increase the gas mass flow rate and thus increase the gas injection momentum, which will lead to higher energy consumption; (2) Poor penetration: The single-phase gas spray gun cannot provide a large momentum to the gas, resulting in a small momentum and poor penetration when the gas is ejected from the nozzle, resulting in poor mixing effect and low mixing efficiency.

[0004] Traditional gas-liquid two-phase atomizing spray guns directly spray droplets into the flue gas, which will cause the local temperature to drop, shorten the reaction temperature window, and shorten the reaction time between ammonia and flue gas, resulting in reduced denitrification efficiency; and the currently used single-phase atomizing spray guns have the problem that the kinetic energy of the reducing agent is not high, and the reducing agent cannot be effectively sprayed to the predetermined position, and the denitrification efficiency is not high, generally only about 50%. Therefore, there is an urgent need for a special denitrification spray gun that can adapt to the flue gas working conditions of coal-fired boilers. Utility Model Content

[0005] The purpose of the utility model is to provide a gas single-phase swirl SNCR denitrification spray gun to overcome the problems existing in the prior art. The utility model adopts rifling in the main gas pipe to enable the airflow to be rotatably sprayed, which greatly improves the problems of poor airflow penetration and poor mixing effect of the traditional single-phase spray gun and improves the denitrification efficiency of SNCR.

[0006] In order to achieve the above-mentioned purpose, the technical solutions adopted by the present invention are as follows:

[0007] A gas single-phase swirl SNCR denitrification spray gun includes a main air pipe, an air inlet pipe is installed at one end of the main air pipe, and an anti-wear nozzle is installed at the other end of the main air pipe; a cooling sleeve is provided on the main air pipe, an insulation layer is installed on the cooling sleeve, and a compressed air pipe is connected to the cooling sleeve, and a compressed air interface is provided at one end of the compressed air pipe; a plurality of rifling grooves are provided on the inner side of the main air pipe, and the rifling grooves are composed of negative and positive lines arranged alternately in a spiral shape;

[0008] Furthermore, a handle is installed on the air intake pipe;

[0009] Furthermore, the surface of the rifling is plated with chromium, and the thickness of the chromium plating is 10-500 μm;

[0010] Furthermore, the total length of the rifling is 100-1000 mm;

[0011] Furthermore, the number of rifling grooves is 1 to 8;

[0012] Furthermore, the depth of the rifling is 1% to 10% of the main air pipe diameter;

[0013] Furthermore, the negative line is a concave groove portion, and the positive line is a convex groove portion;

[0014] Furthermore, the width of the Yin line is greater than or equal to the width of the Yang line;

[0015] Furthermore, the width ratio of the negative line to the positive line is (1-5):1;

[0016] Furthermore, the twist pitch of the rifling is 100-1000 mm.

[0017] The above technical solution has the following advantages or beneficial effects:

[0018] The utility model provides a gas single-phase swirl SNCR denitrification spray gun. Through the rifling design, the airflow is in a rotating state when being sprayed, which greatly improves the problems of poor airflow penetration and poor mixing effect of the traditional single-phase spray gun, can more effectively penetrate the smoke layer and fully contact with the nitrogen oxides in the smoke, and the rotating airflow helps to promote the mixing of the reducing agent and the smoke, improve the reaction efficiency of the reducing agent and the nitrogen oxides, and thus improve the denitrification efficiency of the SNCR; compressed air is introduced into the cooling sleeve through the compressed air interface for cooling, ensuring that the temperature of the main air pipe is maintained below 700°C, and the compressed air flows in the cooling sleeve to take away the heat generated by the high-temperature reaction of the gas inside the spray gun, effectively lowering the working temperature of the spray gun, reducing the related effects of high temperature on the spray gun, such as wear, preventing damage or performance degradation due to overheating, and extending the service life of the spray gun; by arranging the anti-wear nozzle, the spray gun can be protected, and the spray gun can be prevented from wearing under high temperature, reducing the wear problem caused by long-term operation.

[0019] Furthermore, the handle enables the operator to more conveniently hold the air inlet pipe when installing, disassembling or moving the spray gun, thereby improving the convenience and safety of operation.

[0020] Furthermore, chrome plating can significantly improve the hardness of the rifling surface, thereby enhancing its ability to resist wear; during the SNCR denitrification process, the rifling needs to withstand the erosion of high-speed airflow and the impact of particulate matter for a long time, and the chrome plating layer can effectively extend the service life of the rifling.

[0021] Furthermore, by optimizing the total length of the rifling, the number of rifling, the depth of the rifling, the twist pitch of the rifling, and clearly defining the negative and positive lines, the denitrification efficiency, stability and durability of the gas single-phase swirl SNCR denitrification spray gun can be significantly improved.

[0022] Furthermore, the width of the negative line is greater than or equal to the width of the positive line, so that the airflow forms a non-uniform flow in the rifling, thereby enhancing the rotation effect of the airflow, helping to improve the mixing efficiency and penetration of SNCR denitrification, and allowing the reducing agent to more fully contact and react with the nitrogen oxides in the flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of a gas single-phase swirl SNCR denitrification spray gun of the utility model;

[0024] Figure 2 This is a front view of a gas single-phase swirl SNCR denitrification spray gun of the present invention;

[0025] Figure 3 This is a cross-sectional view of a gas single-phase swirl SNCR denitrification spray gun of the present invention;

[0026] Figure 4 This is a cross-sectional view of the main gas pipe of a gas single-phase swirl SNCR denitrification spray gun of the utility model;

[0027] In the figure, 1-intake pipe; 2-main air pipe; 3-cooling jacket; 4-rifling; 4-1-negative line; 4-2-positive line; 5-anti-wear nozzle; 6-handle; 7-compressed air interface; 8-compressed air pipe; 9-insulation layer. DETAILED DESCRIPTION

[0028] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be understood that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally located component. When a component is considered to be "disposed on" another component, it may be directly disposed on the other component or there may be a centrally located component.

[0030] In addition, the terms "long", "short", "inside", "outside", etc. that indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the present invention. They do not indicate or imply that the device or component referred to must have this specific orientation or operate in a specific orientation structure, and should not be understood as a limitation of the present invention.

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] Example 1:

[0033] like Figure 1 and Figure 2As shown, the utility model provides a gas single-phase swirl SNCR denitrification spray gun, including a main air pipe 2, an air inlet pipe 1 is installed at one end of the main air pipe 2, and a handle 6 is installed on the air inlet pipe 1, which is installed and adjusted by the handle 6, and an anti-wear nozzle 5 is installed at the other end of the main air pipe 2; a cooling sleeve 3 is provided on the main air pipe 2 to protect the spray gun and prevent the spray gun from wearing under high temperature, an insulation layer 9 is installed on the cooling sleeve 3, and a compressed air pipe 8 is also connected to the cooling sleeve 3, and a compressed air interface 7 is opened at one end of the compressed air pipe 8, and the compressed air is used to cool the spray gun to ensure that the temperature of the main air pipe 2 is maintained below 700 ° C; a plurality of riflings 4 are provided on the inner side of the main air pipe 2, and the surface of the rifling 4 is chrome-plated. The rifling 4 is composed of a negative line 4-1 and a positive line 4-2 arranged alternately in a spiral shape, the negative line 4-1 is a concave groove portion, and the positive line 4-2 is a convex groove portion. The width of the negative line 4-1 is greater than or equal to the width of the positive line 4-2;

[0034] Preferably, the thickness of the chrome plating is 10 to 500 μm;

[0035] Preferably, the scale of the rifling 4 can be adjusted according to the on-site smoke flow field conditions and is made of 316L stainless steel;

[0036] Preferably, the total length of the rifling 4 is 100-1000 mm;

[0037] Preferably, the number of rifling 4 is 1 to 8;

[0038] Preferably, the depth of the rifling 4 is 1% to 10% of the diameter of the main air pipe 2. The larger the diameter of the anti-wear nozzle 5, the smaller the depth ratio of the rifling 4 to the diameter of the main air pipe 2.

[0039] Preferably, the width ratio of the negative line 4-1 to the positive line 4-2 is (1-5):1;

[0040] Preferably, the pitch of the rifling 4 is 100-1000 mm.

[0041] Example 2:

[0042] like Figure 1 and Figure 2 As shown, the utility model provides a gas single-phase swirl SNCR denitrification spray gun, including an air inlet pipe 1, a main air pipe 2, a cooling sleeve 3, rifling 4, an anti-wear nozzle 5, a handle 6, a compressed air interface 7, a compressed air pipe 8, and an insulation layer 9; the rifling 4 includes a negative line 4-1 and a positive line 4-2;

[0043] An air intake pipe 1 is installed at one end of the main air pipe 2, a handle 6 is installed on the air intake pipe 1, and an anti-wear nozzle 5 is installed at the other end of the main air pipe 2; a cooling jacket 3 is provided on the main air pipe 2, an insulation layer 9 is installed on the cooling jacket 3, and a compressed air pipe 8 is also connected to the cooling jacket 3, and a compressed air interface 7 is opened at one end of the compressed air pipe 8; a rifling 4 is provided on the inner side of the main air pipe 2, and the scale of the rifling 4 can be adjusted according to the on-site flue gas flow field conditions. It is made of 316L stainless steel, the total length of the rifling 4 is 100 mm, the twist pitch is 100 mm, and the depth is 1% of the diameter of the main air pipe 2. The surface of the rifling 4 is chrome-plated with a thickness of 10 μm. The rifling 4 is composed of a negative line 4-1 and a positive line 4-2 arranged alternately in a spiral shape. The negative line 4-1 is a concave groove portion, and the positive line 4-2 is a convex groove portion. The width of the negative line 4-1 is equal to the width of the positive line 4-2, and the width ratio of the negative line 4-1 to the positive line 4-2 is 1:1.

[0044] Example 3:

[0045] like Figure 1 and Figure 2 As shown, the utility model provides a gas single-phase swirl SNCR denitrification spray gun, including an air inlet pipe 1, a main air pipe 2, a cooling sleeve 3, rifling 4, an anti-wear nozzle 5, a handle 6, a compressed air interface 7, a compressed air pipe 8, and an insulation layer 9; the rifling 4 includes a negative line 4-1 and a positive line 4-2;

[0046] The diameter of the main air pipe 2 is 21.3 mm. An air intake pipe 1 is installed at one end of the main air pipe 2, a handle 6 is installed on the air intake pipe 1, and an anti-wear nozzle 5 is installed at the other end of the main air pipe 2. A cooling jacket 3 is provided on the main air pipe 2, an insulation layer 9 is installed on the cooling jacket 3, and a compressed air pipe 8 is also connected to the cooling jacket 3. A compressed air interface 7 is provided at one end of the compressed air pipe 8. Three rifling grooves 4 are provided on the inner side of the main air pipe 2. The scale of the rifling grooves 4 can be adjusted according to the on-site flue gas flow field. The main air pipe 2 is made of 316L stainless steel. The total length of the rifling grooves 4 is 600 mm, the pitch is 800 mm, and the depth is 4% of the diameter of the main air pipe 2. The surface of the rifling grooves 4 is chrome-plated with a thickness of 200. μm, the rifling 4 is composed of negative lines 4-1 and positive lines 4-2 arranged alternately in a spiral shape, the negative lines 4-1 are concave grooves, the positive lines 4-2 are convex grooves, the width of the negative lines 4-1 is greater than the width of the positive lines 4-2, and the width ratio of the negative lines 4-1 to the positive lines 4-2 is 3:1.

[0047] Example 4:

[0048] like Figure 1 and Figure 2As shown, the utility model provides a gas single-phase swirl SNCR denitrification spray gun, including an air inlet pipe 1, a main air pipe 2, a cooling sleeve 3, rifling 4, an anti-wear nozzle 5, a handle 6, a compressed air interface 7, a compressed air pipe 8, and an insulation layer 9; the rifling 4 includes a negative line 4-1 and a positive line 4-2;

[0049] An air intake pipe 1 is installed at one end of the main air pipe 2, a handle 6 is installed on the air intake pipe 1, and an anti-wear nozzle 5 is installed at the other end of the main air pipe 2; a cooling jacket 3 is installed on the main air pipe 2, an insulation layer 9 is installed on the cooling jacket 3, and a compressed air pipe 8 is also connected to the cooling jacket 3, and a compressed air interface 7 is opened at one end of the compressed air pipe 8; 8 rifling grooves 4 are set on the inner side of the main air pipe 2, and the scale of the rifling grooves 4 can be adjusted according to the on-site flue gas flow field conditions. It is made of 316L stainless steel, the total length of the rifling grooves 4 is 1000 mm, the pitch is 1000 mm, and the depth is 10% of the diameter of the main air pipe 2. The surface of the rifling grooves 4 is chrome-plated, and the thickness of the chrome plating is 500 μm, the rifling 4 is composed of negative lines 4-1 and positive lines 4-2 arranged alternately in a spiral shape, the negative lines 4-1 are concave grooves, the positive lines 4-2 are convex grooves, the width of the negative lines 4-1 is greater than that of the positive lines 4-2, and the width ratio of the negative lines 4-1 to the positive lines 4-2 is 5:1.

[0050] The structure and working principle of the utility model are further described below:

[0051] The purpose of the utility model is to provide a gas single-phase swirl SNCR denitrification spray gun. When using the device, the scale of the rifling 4 in the spray gun can be adjusted according to the on-site flue gas flow field conditions. The rifling is turned out in the main air pipe 2 by a lathe, and the rifling is chrome-plated. The thickness of the chrome plating is determined according to the on-site conditions and the gas flow rate. The cooling sleeve 3 is fixedly sleeved on the outside of the main air pipe 2, and compressed air is introduced from the compressed air interface 7. The compressed air enters the cooling sleeve 3 for cooling. The ammonia-containing gas enters the spray gun through the air inlet pipe 1. When passing through the main air pipe 2, the gas begins to rotate under the action of the rifling 4. Finally, the gas is sprayed into the flue gas at a certain rotation speed through the anti-wear nozzle 5. The rotating airflow can be quickly mixed with the flue gas by the entrainment effect in the flue gas, thereby realizing efficient SNCR denitrification.

[0052] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A gas single-phase cyclone SNCR denitrification spray gun, characterized in that: The invention comprises a main air pipe (2), one end of which is provided with an air inlet pipe (1), and the other end of which is provided with an anti-wear nozzle (5); a cooling sleeve (3) is provided on the main air pipe (2), a heat-insulating layer (9) is provided on the cooling sleeve (3), a compressed air pipe (8) is further connected to the cooling sleeve (3), and a compressed air interface (7) is provided at one end of the compressed air pipe (8); a plurality of rifling grooves (4) are provided on the inner side of the main air pipe (2), and the rifling grooves (4) are composed of negative lines (4-1) and positive lines (4-2) arranged alternately in a spiral shape.

2. A gas single-phase cyclone SNCR denitrification spray gun according to claim 1, characterized in that: A handle (6) is installed on the air intake pipe (1).

3. The gas single-phase swirl SNCR denitrification spray gun according to claim 1, characterized in that: The surface of the rifling (4) is plated with chromium, and the thickness of the chromium plating is 10-500 μm.

4. The gas single-phase swirl SNCR denitrification spray gun according to claim 1, characterized in that: The total length of the rifling (4) is 100-1000 mm.

5. The gas single-phase cyclone SNCR denitrification spray gun according to claim 1, characterized in that: The number of the rifling grooves (4) is 1 to 8.

6. The gas single-phase cyclone SNCR denitrification spray gun according to claim 1, characterized in that: The depth of the rifling (4) is 1% to 10% of the diameter of the main air pipe (2).

7. The gas single-phase cyclone SNCR denitrification spray gun according to claim 1, characterized in that: The negative line (4-1) is a concave groove portion, and the positive line (4-2) is a convex groove portion.

8. The gas single-phase cyclone SNCR denitrification spray gun according to claim 1, characterized in that: The width of the negative line (4-1) is greater than or equal to the width of the positive line (4-2).

9. The gas single-phase cyclone SNCR denitrification spray gun according to claim 1, characterized in that: The width ratio of the negative line (4-1) to the positive line (4-2) is (1~5):

1.

10. The gas single-phase cyclone SNCR denitrification spray gun according to claim 1, characterized in that: The pitch of the rifling (4) is 100-1000 mm.

Images