SNCR (selective non-catalytic reduction) denitration high-kinetic-energy long-distance spraying and atomizing spray gun

Abstract

The utility model relates to an SNCR (selective non-catalytic reduction) denitration high-kinetic-energy long-distance spraying and atomizing spray gun which comprises a spray gun pipe with the length not less than 1m, a spray gun nozzle is arranged at the front end of the spray gun pipe, the rear end of the spray gun pipe is connected with an atomizer, an atomizing cavity is arranged in the atomizer, the front end of the atomizing cavity is communicated with the rear end of the spray gun pipe, and the atomizing cavity is communicated with the spray gun pipe. The rear end of the atomizing cavity is communicated with the compressed air channel, and a liquid atomizing nozzle is arranged on the side wall of the atomizing cavity. According to the utility model, the liquid is efficiently atomized under the mutual shearing action of high-speed gas and low-speed liquid in the atomizing cavity, and then the atomized reducing agent is pushed and conveyed to a destination through high-pressure compressed air or steam, so that the effect of mixing the reducing agent and flue gas is achieved. The spray gun has the advantages of wide adjustment ratio, good atomization quality, low gas consumption, small change of an atomization taper angle along with working conditions and the like.

Description

Technical Field

[0001] The utility model relates to a SNCR denitration high kinetic energy long distance spray atomizing spray gun, which is an environmental protection device and a device used for spraying environmental protection agents in a fossil fuel combustion furnace to reduce pollution caused by combustion. Background Art

[0002] Selective non-catalytic reduction (SNCR) uses the furnace as a reactor, does not use a catalyst, and directly sprays amino reducing agents such as ammonia or urea into the furnace. The reducing agent reacts with NO in the flue gas to produce N2 and H2O. The performance of the SNCR spray gun is directly related to the efficiency of NO removal. The key to the design of the spray gun is to ensure that the reducing agent is evenly and fully mixed with the entire furnace flue gas. SNCR denitrification is widely used in power plant boilers, especially in the field of circulating fluidized bed boilers, and has the advantages of convenient transformation. The key point of SNCR denitrification technology is that the reducing agent is sprayed into the most effective temperature window area. The layout of the spray gun should be determined according to the size of the furnace at the boiler injection position. However, due to the limited boiler layout position or the large furnace size, the existing dual-fluid atomization spray gun has limited spray distance and penetration, which affects the denitrification efficiency. The existing dual-fluid spray gun focuses on the atomization particle size but has a short spray distance. The spray coverage area of ​​the furnace and kiln cavity of large boilers is limited, resulting in limited denitrification efficiency. Especially when the furnace temperature is high and the flue gas flow rate is high, the coverage area of ​​the atomized spray reducing agent is more limited. Summary of the invention

[0003] In order to overcome the problems of the prior art, the utility model proposes a SNCR denitrification high kinetic energy long-distance spray atomizing spray gun. The atomizing spray gun has the ability to spray the agent at a high kinetic energy and a long distance while efficiently atomizing the liquid environmental protection agent, and has strong penetration, thereby improving the spray distance and coverage area of ​​the environmental protection agent in a large-sized high-temperature furnace.

[0004] The purpose of the utility model is achieved as follows: a SNCR denitrification high kinetic energy long-distance jet atomizing spray gun, comprising: a spray gun tube with a length of not less than 1 meter, a spray gun nozzle is arranged at the front end of the spray gun tube, the rear end of the spray gun tube is connected to an atomizer, an atomizer is provided in the atomizer, the front end of the atomizing chamber is connected to the rear end of the spray gun tube, the rear end of the atomizing chamber is connected to a compressed air channel, and a liquid atomizing nozzle is arranged on the side wall of the atomizing chamber.

[0005] Furthermore, the spray gun nozzle is conical, with a through hole for spraying liquid in the middle, and the central axis of the through hole is colinear with the center line of rotation of the cone.

[0006] Furthermore, the atomizer is cylindrical, with both ends closed to form an atomizing chamber, one end of the cylinder is fixedly connected to the spray gun pipe as the front end, and the atomizing chamber is connected to the spray gun pipe, the other end of the cylinder is fixedly connected to the input pipe as the compressed air channel as the rear end, and compressed air is passed into the atomizing chamber, and a liquid atomizing nozzle is arranged on one side of the cylinder.

[0007] Furthermore, the atomizing chamber has a constricted opening at the front end and an expanded opening at the rear end.

[0008] Furthermore, the liquid atomizing nozzle is a circular tube with closed ends, and a plurality of nozzles are distributed along the rotation axis at intervals of 180 degrees on the outer circumference of the circular tube.

[0009] The advantages and beneficial effects of the utility model are as follows: the utility model utilizes the mutual shearing effect of high-speed gas and low-speed liquid in the atomization chamber to efficiently atomize the liquid, and then pushes and transports the atomized reducing agent to the destination through high-pressure compressed air or steam to achieve the mixing effect of the reducing agent and the flue gas. The spray gun has the advantages of wide adjustment ratio, good atomization quality, low gas consumption, and small change of atomization cone angle with working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0011] Figure 1 It is a structural schematic diagram of the atomizing spray gun described in the first embodiment of the utility model;

[0012] Figure 2 is a schematic diagram of the structure of the atomizing spray gun described in the first embodiment of the utility model, Figure 1 Enlarged view of the AA section. DETAILED DESCRIPTION

[0013] Embodiment 1:

[0014] This embodiment is a SNCR denitration high kinetic energy long distance spray atomization spray gun, such as Figure 1 , 2 This embodiment comprises: a spray gun tube 1 having a length of not less than 1 meter, a spray gun nozzle 2 being arranged at the front end of the spray gun tube, a rear end of the spray gun tube being connected to an atomizer 3, an atomizer having an atomizing chamber 301 being arranged in the atomizer, a front end of the atomizing chamber being connected to the rear end of the spray gun tube, a rear end of the atomizing chamber being connected to a compressed air channel 4, a liquid atomizing nozzle 5 being arranged on the side wall of the atomizing chamber, and a nozzle direction of the atomizing nozzle (such as Figure 2 The direction of the arrow B in the middle) is perpendicular to the line 3013 connecting the rear end of the spray gun tube (the front end of the atomizing chamber 3011) and the compressed air channel (the rear end of the atomizing chamber 3012). Figure 2 shown.

[0015] The spray gun described in this embodiment utilizes the nozzle arranged in front of the long tube to flexibly adjust the injection position of the reducing agent in the furnace according to the use environment, boiler load fluctuations, and furnace changes, so that the injection of the reducing agent can penetrate and cover the entire cross-section of the furnace. According to the specific combustion conditions, by adjusting the pressure of the compressed air and the input amount of the reducing agent, the reaction parameters such as the atomization particle size can be controlled to improve the SNCR denitrification efficiency.

[0016] The line connecting the front end and the rear end of the atomizing chamber described in this embodiment is actually the flow channel of the compressed air in the atomizing chamber. Figure 2 In the direction indicated by the arrow C. To improve the atomization efficiency, the embodiment sets the reducing agent ejection direction of the atomizing nozzle to be perpendicular to the flow direction of the compressed air, so that the high-speed flowing compressed air and the low-speed flowing reducing agent liquid can shear each other to enhance the liquid atomization effect, and then the atomized reducing agent is pushed to the spray gun nozzle by the high-pressure compressed air to achieve the effect of uniform mixing of the reducing agent and the flue gas.

[0017] It should be noted that the “compressed air” described in this embodiment and the following embodiments may be dry air carrying a small amount of moisture and having a certain amount of energy, or may be water vapor carrying a large amount of moisture and having a certain amount of energy.

[0018] The spray gun nozzle can be conical and can be easily replaced, so that the nozzle can be replaced in time if it is blocked or corroded by high temperature.

[0019] The spray gun tube can be made of high temperature alloy steel to withstand the high temperature in the boiler.

[0020] The process of the spray gun described in this embodiment is as follows: the liquid reducing agent is transported to the atomizing chamber through the liquid atomizing nozzle for atomization and mixing, and at the same time, compressed gas (steam) enters the atomizing chamber from the compressed air channel to provide injection power for the atomized liquid agent, so that it is ejected through the spray gun tube and the spray gun nozzle in turn. During the injection process, according to the combustion conditions in the furnace, the advantage of the long tube is used to select the injection position of the reducing agent in the furnace, so as to further reduce pollution and improve combustion efficiency.

[0021] It should be noted that the "front end" and "rear end" mentioned in this embodiment and the following embodiments refer to the end of the atomizing spray gun that first enters the furnace when it is inserted into the furnace as the front end, and other elements are also determined according to this rule. Figure 1 , 2 The left side of the paper is the front end and the right side is the back end.

[0022] Embodiment 2:

[0023] This embodiment is an improvement of the first embodiment and is a refinement of the spray gun nozzle of the first embodiment. The spray gun nozzle of this embodiment is conical, with a through hole for spraying liquid in the middle, and the central axis of the through hole is colinear with the conical rotation centerline.

[0024] The spray gun nozzle can be connected to the spray gun pipe through a thread so as to be replaced at any time.

[0025] Embodiment three:

[0026] This embodiment is an improvement of the above embodiment, and is a refinement of the above embodiment regarding the atomizing chamber. The atomizer described in this embodiment is cylindrical, with both ends closed to form an atomizing chamber, one end of the cylinder as the front end is fixedly connected to the spray gun pipe, and the atomizing chamber is connected to the spray gun pipe, the other end of the cylinder as the rear end is fixedly connected to the input pipe as the compressed air channel, and the compressed air is passed into the atomizing chamber, and a liquid atomizing nozzle is arranged on one side of the cylinder.

[0027] The inlet of the spray gun pipe should be aligned with the outlet of the compressed air channel as much as possible, and the center lines of the two pipes are preferably collinear, that is, the inlet of the spray gun pipe should be aligned with the outlet of the compressed air channel, and the two openings are in a straight line. An atomizing nozzle for spraying the reducing agent is arranged between the inlet of the spray gun pipe and the outlet of the compressed air channel, and the direction in which the atomizing nozzle sprays the reducing agent liquid is perpendicular to the connecting line between the inlet of the spray gun pipe and the outlet of the compressed air channel, so that the shearing effect between the two airflows is maximized to improve the atomization efficiency.

[0028] Embodiment 4:

[0029] This embodiment is an improvement of the above embodiment and a refinement of the atomizing chamber of the above embodiment. The atomizing chamber described in this embodiment has a constricted opening at the front end and an expanded opening at the rear end.

[0030] The front end of the atomizing chamber, which is the position connected to the spray gun pipe, is the entrance of the spray gun pipe. The atomized gas in the atomizing chamber enters the spray gun pipe through this. Therefore, a constriction is set here to avoid turbulence in the airflow and smoothly enter the spray gun pipe.

[0031] Similarly, the rear end of the atomizing chamber is where the atomizing chamber is connected to the compressed air channel. When the compressed air leaves the compressed air channel, it will expand rapidly. To avoid this rapid expansion phenomenon, this embodiment provides a flare at the junction of the compressed air channel and the atomizing chamber, so that the compressed air can smoothly enter the atomizing chamber.

[0032] Embodiment five:

[0033] This embodiment is an improvement of the above embodiment and a refinement of the above embodiment regarding the liquid atomizing nozzle. The liquid atomizing nozzle described in this embodiment is a round tube with closed ends, and a plurality of nozzles are distributed along the rotation axis at intervals of 180 degrees on the outer circumference of the round tube.

[0034] In order to produce the best atomization effect, this embodiment uses a small section of pipe as the main body of the liquid atomization nozzle. This small section of pipe is inserted into the atomization chamber from the side of the atomization chamber. The direction of liquid spraying is perpendicular to the rotation center line of the atomization chamber and parallel to the radial direction of the atomization chamber, so as to achieve the vertical direction of liquid spraying and the flow direction of compressed air.

[0035] Finally, it should be noted that the above is only used to illustrate the technical solution of the utility model and is not a limitation. Although the utility model has been described in detail with reference to the preferred arrangement scheme, ordinary technicians in the field should understand that the technical solution of the utility model (such as the shape of the injection, the furnace and combustion environment used, etc.) can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model.

Claims

1. A SNCR denitrification high kinetic energy long distance spray atomization spray gun, characterized in that: include: A spray gun tube with a length of not less than 1 meter, a spray gun nozzle is arranged at the front end of the spray gun tube, the rear end of the spray gun tube is connected to an atomizer, an atomizer is arranged in the atomizer, the front end of the atomizer cavity is connected to the rear end of the spray gun tube, the rear end of the atomizer cavity is connected to a compressed air channel, and a liquid atomizing nozzle is arranged on the side wall of the atomizer cavity.

2. The atomizing spray gun according to claim 1, characterized in that: The spray gun nozzle is conical, with a through hole for spraying liquid in the middle, and the central axis of the through hole is colinear with the conical rotation center line.

3. The atomizing spray gun according to claim 2, characterized in that: The atomizer is cylindrical, with both ends closed to form an atomizing chamber. One end of the cylinder is fixedly connected to the spray gun pipe as the front end, and the atomizing chamber is connected to the spray gun pipe. The other end of the cylinder is fixedly connected to the input pipe as the compressed air channel as the rear end, and compressed air is passed into the atomizing chamber. A liquid atomizing nozzle is arranged on one side of the cylinder.

4. The atomizing spray gun according to claim 3, characterized in that: The front end of the atomizing chamber is provided with a contraction opening, and the rear end is provided with an expansion opening.

5. The atomizing spray gun according to claim 4, characterized in that: The liquid atomizing nozzle is a round tube with closed ends, and a plurality of nozzles are distributed along the rotating axis at intervals of 180 degrees on the outer circumference of the round tube.

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