A new denitration system

Abstract

The utility model relates to denitration system technical field discloses a kind of novel denitration systems, comprising: combustion boiler, the side of combustion boiler is connected with flue, the outer wall of one end of flue close to combustion boiler is connected with gas mixing cylinder, the protective sleeve shell of heat protection function is installed in the end of gas mixing cylinder away from flue by bolt, the junction of gas mixing cylinder and flue is provided with air supply pipe, the end of gas mixing cylinder close to air supply pipe is also connected with three times wind pipe, the junction of air supply pipe and three times wind pipe is provided with the mixing pipe of U shape. The novel denitration system is provided with gas mixing cylinder, it is used to mix ammonia water and three times wind fully and evenly, cooperate base to adapt adjustment to the flue of gas mixing cylinder and combustion boiler, make mixed denitration gas send into the flue section of combustion boiler and flue gas fully contact, adapt the stable denitration operation of combustion boiler under wide load state.

Description

Technical Field

[0001] This utility model relates to the field of denitrification system technology, specifically a novel denitrification system. Background Technology

[0002] Denitrification refers to the reduction of nitrogen oxide emissions from coal-fired or oil-fired equipment through specific technologies, thereby reducing environmental pollution. Nitrogen oxides are mainly produced by fuel combustion and, once released into the atmosphere, easily contribute to environmental problems such as acid rain and photochemical smog. Denitrification primarily involves the absorption of nitrogen oxides by alkaline solutions or the reduction of nitrogen oxides into harmless nitrogen and water using catalysts.

[0003] A search revealed an SNCR denitrification system with publication number CN207137678U, which includes a dust collector bag, an annular frame, a water flow chamber, a cleaning brush, a support, a sealing plate, a cylinder, a reactant chamber, and a reactant inlet. This system addresses the problem of insufficient contact between the reactant and flue gas during SNCR denitrification, resulting in poor reaction efficiency. In this practical application, the reactant is sprayed and mixed through nozzles and other structures. The denitrification reaction temperature is affected by the storage tank, resulting in a relatively low reaction temperature that differs significantly from the boiler temperature, making it unsuitable for the wide-load operation of the boiler. Therefore, we propose a novel denitrification system. Utility Model Content

[0004] The purpose of this invention is to provide a novel denitrification system to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a novel denitrification system, comprising:

[0006] A combustion boiler has a flue connected to one side. A mixing cylinder is connected to the outer wall of the flue near the boiler end. A protective sleeve for heat insulation is bolted to the end of the mixing cylinder away from the flue. An air supply pipe is provided at the connection between the mixing cylinder and the flue. A tertiary air pipe is also connected to the end of the mixing cylinder near the air supply pipe. A U-shaped mixing pipe is provided at the connection between the air supply pipe and the tertiary air pipe. A spiral tube is wound around the end of the mixing tube near the tertiary air pipe. The end of the spiral tube away from the tertiary air pipe is connected to the mixing pipe through a double-joint. The end of the spiral tube near the tertiary air pipe is connected to the mixing pipe through a tee. An ammonia pipe with a valve assembly is also connected to the end of the spiral tube near the tertiary air pipe through a tee. The ammonia pipe extends to the outer wall of one end of the protective sleeve.

[0007] Furthermore, the protective sleeve and the mixing cylinder form a detachable structure, and the protective sleeve, the mixing pipe, and the spiral pipe form an enclosing structure.

[0008] Furthermore, the combustion boiler is connected to the mixing cylinder via a flue, and the tertiary air duct is connected to the flue via a mixing pipe and an air supply pipe.

[0009] Furthermore, the inner surface of the spiral tube does not contact the outer wall of the mixing tube, and the ammonia tube is connected to the mixing tube through the spiral tube.

[0010] Furthermore, a base is installed below the mixing cylinder, a support plate is vertically fixed to the upper end of the base, an arc-shaped cylinder support is fixed to the top of the support plate, a metal pad is laid on the contact surface between the cylinder support and the protective shell, and a concrete block is installed at the lower end of the base.

[0011] Furthermore, the support plate and the cylinder support are evenly distributed at equal intervals along the upper surface of the base, and the protective sleeve is connected to the support plate by means of the pad and the cylinder support, and the pad blocks are evenly distributed at equal intervals along the lower surface of the base.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] This new denitrification system is equipped with a mixing cylinder, which is used to fully and evenly mix gasified ammonia water with tertiary air. The base is used to adapt and adjust the mixing cylinder to the flue of the combustion boiler, so that the mixed denitrification gas is sent into the flue section of the combustion boiler and makes full contact with the flue gas, which is suitable for stable denitrification operation of the combustion boiler under wide load conditions. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the combined working state structure of the denitrification system of this utility model;

[0015] Figure 2 This is a magnified front view of the gas mixing cylinder of this utility model in its unsheathed state.

[0016] Figure 3 This is a schematic diagram of the main structure of the base part of this utility model.

[0017] In the diagram: 1. Combustion boiler; 2. Flue; 3. Mixing cylinder; 301. Protective casing; 302. Tertiary air duct; 303. Air supply duct; 304. Mixing pipe; 305. Spiral pipe; 306. Ammonia pipe; 4. Base; 5. Support plate; 6. Cylinder support; 7. Pad plate; 8. Pad block. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] This utility model provides a novel denitrification system through improvements. Please refer to [link / reference]. Figures 1-2 The system includes: a combustion boiler 1, a flue 2 connected to one side of the combustion boiler 1, a mixing cylinder 3 connected to the outer wall of the end of the flue 2 near the combustion boiler 1, the combustion boiler 1 and the mixing cylinder 3 forming a communication connection, a protective sleeve 301 for heat insulation protection bolted to the end of the mixing cylinder 3 away from the flue 2, the protective sleeve 301 and the mixing cylinder 3 forming a detachable structure, an air supply pipe 303 provided at the connection between the mixing cylinder 3 and the flue 2, and the mixing cylinder 3 near the air supply pipe 303. One end of section 3 is also connected to a tertiary air duct 302, and the tertiary air duct 302 is connected to the flue 2 via a mixing pipe 304 and an air supply pipe 303. A U-shaped mixing pipe 304 is provided at the connection between the air supply pipe 303 and the tertiary air duct 302. A spiral pipe 305 is wound around the end of the mixing pipe 304 near the tertiary air duct 302. The spiral pipe 305 is used to reduce the cross-sectional area of ​​the mixing section and extend the pipe length, thereby improving the mixing effect of the gasified ammonia water and the tertiary air. Achieving efficient denitrification within flue 2; the inner surface of the spiral tube 305 does not contact the outer wall of the mixing tube 304, and the protective sleeve 301 forms an enclosing structure with the mixing tube 304 and the spiral tube 305. The end of the spiral tube 305 away from the tertiary air duct 302 is connected to the mixing tube 304 via a double-joint, and the end of the spiral tube 305 near the tertiary air duct 302 is connected to the mixing tube 304 via a tee. The end of the spiral tube 305 near the tertiary air duct 302 is also connected to an assembly via a tee. The ammonia gas pipe 306 of the valve, with double and three-way connections, is used to ensure good connection stability and airtightness between various components; the ammonia gas pipe 306 extends to the outer wall of one end of the protective casing 301, and the ammonia gas pipe 306 is connected to the mixing pipe 304 through the spiral pipe 305. The mixing cylinder 3 is used to fully and evenly mix the gasified ammonia water with the tertiary air, and then send it into the flue duct 2 section of the combustion boiler 1 to fully contact the flue gas, which is suitable for the stable denitrification operation of the combustion boiler 1 under wide load conditions.

[0020] Please see Figure 1 and Figure 3A novel denitrification system includes: a base 4 placed below a mixing cylinder 3; a support plate 5 vertically fixed to the upper end of the base 4; an arc-shaped cylinder support 6 fixed to the top of the support plate 5; the support plate 5 and the cylinder support 6 being evenly distributed at equal intervals along the upper surface of the base 4; a metal pad 7 covering the contact surface between the cylinder support 6 and the protective casing 301; and the protective casing 301 being connected to the support plate 5 through the pad 7 and the cylinder support 6; the pad 7 being used to enhance the connection stability between the protective casing 301 and the cylinder support 6, increasing friction to prevent the mixing cylinder 3 from shaking on the cylinder support 6; and concrete blocks 8 placed at the lower end of the base 4, with the blocks 8 being evenly distributed at equal intervals along the lower surface of the base 4; the blocks 8 being used to adjust the height of the base 4, facilitating the matching of the installation position of the mixing cylinder 3 with the cross-section of the flue 2 of the combustion boiler 1, thereby improving the quality of the denitrification operation.

[0021] Working Principle: For this type of novel denitrification system, when the flue gas generated by the combustion boiler 1 is discharged through the flue 2, the mixing cylinder 3 introduces tertiary air at a high temperature of approximately 900°C through the tertiary air pipe 302. Simultaneously, the ammonia pipe 306 delivers vaporized ammonia water to the spiral pipe 305. Within the U-shaped structure of the mixing pipe 304, the high-temperature tertiary air and the ammonia in the spiral pipe 305 undergo their first mixing. The spiral structure of the spiral pipe 305 significantly improves the mixing uniformity of the vaporized ammonia water and the tertiary air by extending the pipe length and reducing the flow cross-section. The mixed denitrification gas is then injected into the cross-section of the flue 2 through the air supply pipe 303, where it fully contacts the flue gas and undergoes a reduction reaction. The protective casing 301 is fixed to the end of the mixing cylinder 3 with bolts, and the mixing pipe 304 inside it is the first to be mixed. 4 and the spiral tube 305 form a heat insulation cavity to prevent high-temperature radiation from damaging the components. The height of the base 4 is adjusted by the concrete pad 8 so that the pad 7 on the cylinder support 6 accurately supports the protective shell 301. The support plate 5 and the evenly distributed cylinder support 6 together ensure the installation stability of the mixing cylinder 3. When the boiler load changes, the ammonia flow rate can be controlled by adjusting the valve of the ammonia pipe 306. Combined with the air volume adjustment of the air supply pipe 303, stable denitrification efficiency under wide load conditions can be achieved. In the whole system, the double-way and three-way connectors ensure the airtightness of each pipeline. The metal pad 7 enhances the anti-friction performance. The non-contact design of the U-shaped mixing pipe 304 and the spiral tube 305 avoids thermal stress concentration and adapts to the variable operating conditions of the boiler at low load or full load.

[0022] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A novel denitrification system, characterized in that, include: A combustion boiler (1) is connected to a flue (2) on one side. A mixing cylinder (3) is connected to the outer wall of the end of the flue (2) near the combustion boiler (1). A protective sleeve (301) for heat insulation is installed on the end of the mixing cylinder (3) away from the flue (2) by bolts. An air supply pipe (303) is provided at the connection between the mixing cylinder (3) and the flue (2). A tertiary air pipe (302) is also connected to the end of the mixing cylinder (3) near the air supply pipe (303). A U-shaped mixing pipe is provided at the connection between the air supply pipe (303) and the tertiary air pipe (302). The mixing pipe (304) has a spiral pipe (305) wound around one end of the mixing pipe (304) near the tertiary air pipe (302). The end of the spiral pipe (305) away from the tertiary air pipe (302) is connected to the mixing pipe (304) through a double-connector. The end of the spiral pipe (305) near the tertiary air pipe (302) is connected to the mixing pipe (304) through a tee. The end of the spiral pipe (305) near the tertiary air pipe (302) is also connected to an ammonia pipe (306) with a valve assembly through a tee. The ammonia pipe (306) extends to the outer wall of one end of the protective casing (301).

2. The novel denitrification system according to claim 1, characterized in that: The protective sleeve (301) and the mixing cylinder (3) form a detachable structure, and the protective sleeve (301) and the mixing pipe (304) and the spiral pipe (305) form an enclosing structure.

3. The novel denitrification system according to claim 1, characterized in that: The combustion boiler (1) is connected to the mixing cylinder (3) through the flue (2), and the tertiary air pipe (302) is connected to the flue (2) through the mixing pipe (304) and the air supply pipe (303).

4. The novel denitrification system according to claim 1, characterized in that: The inner surface of the spiral tube (305) does not contact the outer wall of the mixing tube (304), and the ammonia tube (306) is connected to the mixing tube (304) through the spiral tube (305).

5. A novel denitrification system according to claim 1, characterized in that: A base (4) is placed below the mixing cylinder (3). A support plate (5) is vertically fixed at the upper end of the base (4). An arc-shaped cylinder support (6) is fixed at the top of the support plate (5). A metal pad (7) is laid on the contact surface between the cylinder support (6) and the protective shell (301). A concrete block (8) is placed at the lower end of the base (4).

6. A novel denitrification system according to claim 5, characterized in that: The support plate (5) and the cylinder support (6) are evenly distributed at equal intervals along the upper surface of the base (4), and the protective sleeve (301) is connected to the support plate (5) by means of the pad (7) and the cylinder support (6), and the pad block (8) is evenly distributed at equal intervals along the lower surface of the base (4).

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