CN217614013U - An ammonia-smoke mixed turbulence generator for SCR denitration system - Google Patents

Abstract

The utility model discloses a mixed turbulence generator of ammonia cigarette for SCR deNOx systems, including the flue gas entry, a plurality of spoilers of upper portion fixedly connected with of vertical flue inner wall, the top of vertical flue is through the one end of first guide plate fixed connection at the connecting tube, the other end of connecting tube passes through the top of second guide plate fixed connection at the denitration tower, the bottom fixedly connected with exhanst gas outlet of denitration tower, the middle part of flue gas entry is provided with hot-blast joint, the utility model provides a be used for SCR deNOx systems to connectThe turbulent plate mainly utilizes standing wave principle, the smoke gas passes through the vortex mixer to form stable vortex or rotational flow, when the smoke gas flows through the turbulent plate, the fluid speed at the tail end is less than that of the surrounding area, and the NH can be forced by the pneumatic pressure difference generated by the pneumatic pressure difference ₃ Or NO _x The mixed gas stream creates a set of vortices that are counter-rotating and that spin the surrounding gas stream as the longitudinal vortices move downstream.

Description

An ammonia-smoke mixed turbulence generator for SCR denitration system

technical field

The utility model relates to the technical field of flue gas denitration, in particular to an ammonia-smoke mixed disturbance generator used in an SCR denitration system.

Background technique

Nitrogen oxides are extremely harmful to the human body and the environment. Nitrogen oxides can cause serious damage to human tissues and organ functions and even endanger life. In addition, they can cause corrosion to buildings and damage to the environment. The regulation of exhausted flue gas is also becoming more and more strict, and it is also very necessary for the denitration treatment of coal-fired power plants and coking enterprises. Since the 1970s, boiler units have taken the lead in using selective catalytic reduction technology, and so far the denitration efficiency of flue gas has also improved. It has reached more than 95% and has been widely adopted by international counterparts.

At present, there are two types of reducing agent ammonia injection devices. One is the ammonia injection grid method, which mainly uses the ammonia injection grid method in the process of SCR process performance research to achieve uniform mixing of ammonia and flue gas. However, There are also many problems, such as small diameter and large number of ammonia injection ports, which are prone to clogging by fly ash under high temperature and high dust conditions, and do not have the ability to adjust flow uniformity. The second is the trapped vortex type ammonia injection mixer. Through production practice and theoretical research, it is found that this method will directly affect the denitration performance of the entire SCR denitration system, so it is necessary to study and give the design scheme of the spoiler.

Utility model content

The utility model provides an ammonia-smoke mixed disturbance generator for an SCR denitration system, which solves the technical problems of uneven distribution of _NOx concentration along the depth direction of the flue and easy blockage and wear of the inside of the flue.

In order to solve the above technical problems, the present invention provides an ammonia-smoke mixed turbulence generator for an SCR denitration system, which includes a flue gas inlet, and the top of the flue gas inlet is fixedly connected to the vertical through a first deflector. The bottom end of the flue, the lower part of the vertical flue is fixedly connected with an ammonia injection grille, the middle part of the ammonia injection grille is evenly distributed with a plurality of ammonia injection ports, and the upper part of the inner wall of the vertical flue is fixed A plurality of spoilers are connected, the top of the vertical flue is fixedly connected to one end of the connecting pipe through the first deflector, and the other end of the connecting pipe is fixedly connected to the top of the denitrification tower through the second deflector The bottom end of the denitration tower is fixedly connected with a flue gas outlet, and a hot air joint is arranged in the middle of the flue gas inlet.

Preferably, a rectifier is fixedly connected to the upper part of the inner wall of the denitration tower, and a catalyst layer is fixedly connected to the lower part of the inner wall of the denitration tower.

Preferably, the hot air joint is fixedly connected to one end of the heat preservation pipe, and the other end of the heat preservation pipe is fixedly connected to a hot blast stove.

Preferably, the ammonia injection ports are arranged tangentially to each other, and the ammonia injection ports can be arranged in any number between six and eight.

Preferably, the spoilers are all S-shaped, the upper and lower ends of the S-shape of the spoiler are tangent to arcs, and the upper and lower radii of the spoiler are the same.

Preferably, any length between the bottom end of the spoiler and the top end of the ammonia injection port is maintained between 1500mm and 2000mm, and the spoiler can be provided in any number between fourteen and sixteen.

Compared with the related art, an ammonia-smoke mixed disturbance generator for SCR denitration system provided by the present invention has the following beneficial effects:

1. The present utility model provides an ammonia-smoke mixing spoiler generator for SCR denitration system. The spoiler mainly uses the standing wave principle. The flue gas passes through the vortex mixer to form a stable vortex or swirl. When the spoiler is used, the fluid velocity at the tail end is lower than the velocity of the surrounding area, and the resulting aerodynamic pressure difference can force the _NH3 or _NOx mixed gas flow to generate a set of vortices, whose swirl directions are opposite, and the longitudinal vortices can swirl when they move downstream. Inhale the surrounding airflow, strengthen the material transfer in the high and low pressure areas, and efficiently mix NH ₃ or NO _x , the spoiler can strengthen the turbulent diffusion, facilitate the mixing of ammonia and nitrogen oxides in the flue gas to diffuse in the depth direction of the flue, and can alleviate NO _x The problem of uneven distribution of concentration along the depth direction of the flue.

2. The present utility model provides an ammonia-smoke mixed disturbance generator for SCR denitration system. By setting a spoiler device, the speed uniformity can be further adjusted, so as to avoid the influence of the bias flow on the denitration reaction, and the ability of the catalyst can be fully exerted. , to avoid blockage and wear.

Description of drawings

Fig. 1 is the front view of a kind of ammonia-smoke mixed disturbance generator for SCR denitration system of the present invention;

2 is a schematic diagram of a spoiler of an ammonia-smoke mixed spoiler generator used in an SCR denitration system of the present invention;

3 is a schematic diagram of an ammonia injection port of an ammonia-smoke mixed turbulence generator used in an SCR denitration system of the present invention;

Labels in the figure: 1, flue gas inlet; 2, first deflector; 3, vertical flue; 4, ammonia injection grill; 5, ammonia injection port; 6, spoiler; 7, connecting pipe; 8 9, denitration tower; 10, rectifier; 11, catalyst layer; 12, flue gas outlet; 13, hot air joint; 14, insulation pipe; 15, hot blast stove.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. For example; based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

Example, as shown in Figures 1-3, the present utility model is an ammonia smoke mixed turbulence generator for SCR denitration system, including a flue gas inlet 1, and the top of the flue gas inlet 1 passes through a first deflector 2. It is fixedly connected to the bottom end of the vertical flue 3, and the lower part of the vertical flue 3 is fixedly connected with an ammonia injection grill 4. A plurality of ammonia injection ports 5 are evenly distributed in the middle of the ammonia injection grill 4. The vertical flue 3. The upper part of the inner wall is fixedly connected with a plurality of spoilers 6, the top of the vertical flue 3 is fixedly connected to one end of the connecting pipe 7 through the first deflector 2, and the other end of the connecting pipe 7 passes through the second deflector 8 It is fixedly connected to the top of the denitration tower 9 , the bottom end of the denitration tower 9 is fixedly connected with a flue gas outlet 12 , and a hot air joint 13 is arranged in the middle of the flue gas inlet 1 .

Wherein, a rectifier 10 is fixedly connected to the upper part of the inner wall of the denitration tower 9, and the flue gas can normally enter the interior of the denitration tower 9 through the rectifier 10, and a catalyst layer 11 is fixedly connected to the lower part of the inner wall of the denitration tower 9. Gas goes out of stock after chemical reaction.

The hot air joint 13 is fixedly connected to one end of the heat preservation pipe 14, and the other end of the heat preservation pipe 14 is fixedly connected to a hot blast stove 15. The hot blast stove 15 can generate high-speed hot air, and then the heat preservation pipe 14 and the hot air joint 13 can deliver the hot air to the Inside the flue gas duct.

Among them, the ammonia injection ports 5 are arranged tangentially to each other, and the ammonia injection ports 5 can be arranged in any number between six and eight, so that the ammonia injection ports 5 can fully occupy a larger cross-sectional area as much as possible, thereby ensuring that The ammonia gas inside the flue gas pipeline is sufficient to ensure that the flue gas and ammonia gas can be fully mixed.

Among them, the spoiler 6 is S-shaped, the upper and lower ends of the S-shape of the spoiler 6 are tangent to the arcs, the upper and lower radii of the spoiler 6 are the same, and the S-shaped spoiler 6 can slow down the smoke The flow velocity of the flue gas is changed and the flow direction of the flue gas is changed so that it can be better mixed with the ammonia gas.

Among them, the bottom end of the spoiler 6 and the top end of the ammonia injection port 5 are kept at any length between 1500mm and 2000mm, so as to ensure that the ammonia gas coming out from the ammonia injection port 5 can be fully contacted with the flue gas, disturbing the The flow sheet 6 can be set in any number between fourteen and sixteen sheets, which can achieve a better spoiler effect.

Working principle: After the flue gas is mixed with the hot air inside the hot blast stove 15 through the flue gas inlet 1, it will enter the interior of the vertical flue 3 through the first deflector 2, and pass through the ammonia injection port 5 in the interior of the vertical flue 3. It can release an appropriate amount of ammonia gas. When the flue gas passes through the spoiler 6, it will form an airflow vortex and reduce the flow rate, so that the flue gas can be fully mixed with ammonia gas, and then enter the denitrification tower 9 through the connecting pipe 7 for purification. Finally, the purified flue gas can be discharged through the flue gas outlet 12 .

Claims (6)

1. The utility model provides an ammonia cigarette mixes turbulence generator for SCR deNOx systems, includes flue gas entry (1), its characterized in that, the top of flue gas entry (1) is through the bottom of first guide plate (2) fixed connection in vertical flue (3), the inside lower part fixedly connected with of vertical flue (3) spouts ammonia grid (4), the middle part evenly distributed of spouting ammonia grid (4) has a plurality of ammonia mouths (5) of spouting, a plurality of spoiler pieces of upper portion fixedly connected with (6) of vertical flue (3) inner wall, the top of vertical flue (3) is through the one end of first guide plate (2) fixed connection at connecting tube (7), the other end of connecting tube (7) passes through the top of second guide plate (8) fixed connection at denitration tower (9), the bottom fixedly connected with exhanst gas outlet (12) of denitration tower (9), the middle part of flue gas entry (1) is provided with hot air connection (13).

2. The ammonia-smoke mixing turbulence generator for the SCR denitration system of claim 1, wherein a rectifier (10) is fixedly connected to the upper part of the inner wall of the denitration tower (9), and a catalyst layer (11) is fixedly connected to the lower part of the inner wall of the denitration tower (9).

3. The ammonia-smoke mixing turbulence generator for the SCR denitration system according to claim 1, wherein the hot air connector (13) is fixedly connected to one end of a heat insulation pipeline (14), and the other end of the heat insulation pipeline (14) is fixedly connected with a hot air furnace (15).

4. An ammonia smoke mixing turbulence generator for SCR denitration system according to claim 1, characterized in that the ammonia injection openings (5) are arranged tangentially to each other two by two, and the number of the ammonia injection openings (5) can be any number between six and eight.

5. The ammonia smoke mixing turbulence generator for the SCR denitration system as defined in claim 1, wherein the turbulence plate (6) is S-shaped, the arcs of the upper and lower ends of the S-shaped turbulence plate (6) are tangent, and the radius of the upper and lower parts of the turbulence plate (6) is the same.

6. The ammonia smoke mixing turbulence generator for the SCR denitration system as defined in claim 1, wherein the length between the bottom end of the turbulence plate (6) and the top end of the ammonia injection port (5) is kept at any length between 1500mm and 2000mm, and the number of the turbulence plates (6) can be set at any number between fourteen and sixteen.

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