Spray gun device suitable for SNCR (selective non-catalytic reduction) denitration of urea

Abstract

The utility model relates to an SNCR (selective non-catalytic reduction) denitration device, in particular to a spray gun device for SNCR denitration of urea. The utility model aims to provide a spray gun device for SNCR (selective non-catalytic reduction) denitration of urea, and a denitration spray gun has the functions of quantitatively mixing and spraying a reducing agent and a desalted water solution, and is simple in structure and stable in operation. According to the technical scheme, the spray gun device for SNCR denitration suitable for urea comprises a spray gun sleeve coaxially wrapping the front half portion of a spray gun body, a nozzle arranged at the front end of the spray gun body and a plurality of access ports. The spray gun is characterized in that the plurality of access ports are a protective air access port connected to a spray gun sleeve, a compressed air access port coaxially arranged at the rear end of the spray gun main body, and a urea solution access port and a demineralized water access port which are communicated with the spray gun main body through a mixer; and the access ports are respectively communicated with the conveying units of the corresponding components one by one through metal hoses provided with ball valves.

Description

Technical Field

[0001] This utility model relates to an SNCR denitrification device, specifically a spray gun device for SNCR denitrification of urea. Background Technology

[0002] In boiler flue gas SNCR (Selective Non-Catalytic Reduction) denitrification systems, urea or ammonia water is commonly used as the denitrification agent. CN108479362A discloses an SNCR denitrification system, including a reducing agent injection unit, a reducing agent storage unit, a reducing agent delivery unit, a dilution water delivery unit, a metering and distribution unit, and an injection unit. The reducing agent injection unit injects the reducing agent into the reducing agent storage unit and then delivers it to the metering and distribution unit through the reducing agent delivery unit. At the same time, the dilution water delivery unit pumps the demineralized water solution to the metering and distribution unit. The metering and distribution unit then distributes a fixed amount of reducing agent to the injection unit and injects it into the denitrification reaction chamber.

[0003] The shortcomings of the above-mentioned denitrification system are that the metering and dispensing unit for quantitatively mixing the reducing agent and the desalination solution has a relatively complex structure, occupies a large volume, and is difficult to reduce in cost. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the above-mentioned background technology and provide a spray gun device for SNCR denitrification of urea. The denitrification spray gun has the function of quantitative mixing and spraying of reducing agent and desalination solution, and has a simple structure and stable operation.

[0005] The technical solution provided by this utility model is:

[0006] A spray gun device for SNCR denitrification of urea includes a spray gun sleeve coaxially covering the front half of the spray gun body, a nozzle disposed at the front end of the spray gun body, and a plurality of inlets. The plurality of inlets are characterized in that: a protective air inlet connected to the spray gun sleeve, a compressed air inlet coaxially disposed at the rear end of the spray gun body, and a urea solution inlet and a demineralized water inlet connected to the spray gun body via a mixer; each of these inlets is connected to a corresponding component delivery unit via a metal hose equipped with a ball valve.

[0007] The mixer is a Y-shaped mixer, and the two inlets of the mixer are the urea solution inlet and the demineralized water inlet, respectively.

[0008] Each metal hose has a hose connector at one end that connects to the spray gun body, and each connection point is equipped with a PTFE gasket.

[0009] The metal hoses connecting the compressed air inlet, urea solution inlet, and demineralized water inlet are also equipped with check valves.

[0010] The beneficial effects of this utility model are: by using this utility model, urea solution and demineralized water can be directly mixed and sprayed quantitatively at the spray gun inlet, eliminating the need for a separate metering and distribution unit, saving the space occupied by the metering and distribution unit, with a simple structure, stable operation, and simplified equipment while saving construction costs. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the main structure of an embodiment of the present utility model.

[0012] Figure 2 This is an exploded view of an embodiment of the present utility model.

[0013] The following are the labels in the diagram: Nozzle 1, Spray gun body 2, Spray gun sleeve 3, Inlet 4, PTFE gasket 5, Metal hose 6, Threaded connector 7, Check valve 8, Ball valve 9, Single thread end 10, Compressed air inlet 11, Urea solution inlet 12, Demineralized water inlet 13, Protective air inlet 14, Mixer 15. Detailed Implementation

[0014] The following description, in conjunction with the embodiments shown in the accompanying drawings, provides further details.

[0015] The attached figure shows an SNCR denitrification spray gun device for urea, which includes a spray gun sleeve 3 coaxially covering the front half of the spray gun body, a nozzle 1 located at the front end of the spray gun body, and several inlets 4; these are similar to existing SNCR denitrification spray guns.

[0016] The improvement of this utility model is that: the plurality of inlets are a protective air inlet, a compressed air inlet, a urea solution inlet, and a demineralized water inlet; each of these inlets is connected to the corresponding component delivery unit through a metal hose 6 equipped with a ball valve 9; and a check valve 8 is also provided on the metal hoses connecting the compressed air inlet, the urea solution inlet, and the demineralized water inlet.

[0017] The compressed air inlet is coaxially arranged at the rear end of the spray gun body, and the other end of the metal hose connected to the inlet is the compressed air inlet 11; the protective air inlet is connected to the side of the spray gun sleeve, and the other end of the metal hose connected to the inlet is the protective air inlet 14; the spray gun body is also provided with a Y-shaped mixer 15, and the two inlets of the mixer are respectively used as the urea solution inlet 12 and the demineralized water inlet 13.

[0018] Furthermore, each metal hose has a hose connector at one end that connects to the spray gun body or spray gun sleeve, and each connection is equipped with a PTFE gasket. The hose connector at the other end of each metal hose connects to the ball valve 5 and / or check valve 8; wherein: the metal hoses for conveying compressed air, urea solution, and demineralized water are sequentially connected to a PTFE gasket, a threaded connector 7, a check valve 8, a threaded connector, a ball valve 9, and a single-threaded end 10, and the inlets of the single-threaded ends connected to the three metal hoses are respectively the compressed air inlet 11, the urea solution inlet 12, and the demineralized water inlet 13; the metal hose for conveying protective air is sequentially connected to a PTFE gasket, a threaded connector 7, a ball valve 9, and a single-threaded end 10, and the inlet of this single-threaded end is the protective air inlet 14.

[0019] This utility model is installed in the area of ​​the first channel of the boiler with a temperature of 900℃ to 1100℃, which requires high temperature resistance and flue gas erosion resistance of the spray gun; therefore, the spray gun nozzle is made of stainless steel 310SS, which has the properties of high temperature resistance, corrosion resistance and flue gas erosion resistance, and can extend the service life; the spray gun body is made of stainless steel 316L, which has good corrosion resistance.

Claims

1. A spray gun device for SNCR denitrification of urea, comprising a spray gun sleeve (3) coaxially covering the front half of the spray gun body (2), a nozzle (1) disposed at the front end of the spray gun body, and a plurality of inlets (4), characterized in that: The plurality of inlets are a protective air inlet connected to the spray gun sleeve (3), a compressed air inlet coaxially arranged at the rear end of the spray gun body, and a urea solution inlet and a demineralized water inlet connected to the spray gun body through a mixer (15); each of these inlets is connected to the corresponding component delivery unit through a metal hose (6) equipped with a ball valve (9).

2. The spray gun device for SNCR denitrification of urea according to claim 1, characterized in that: The mixer is a Y-shaped mixer, and the two inlets of the mixer are the urea solution inlet and the demineralized water inlet, respectively.

3. The spray gun device for SNCR denitrification of urea according to claim 2, characterized in that: Each metal hose has a hose connector at one end that connects to the spray gun body, and each connection part is equipped with a PTFE gasket (5).

4. The spray gun device for SNCR denitrification of urea according to claim 3, characterized in that: The metal hoses connected to the compressed air inlet, urea solution inlet, and demineralized water inlet are each equipped with a check valve (8).

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