CN212632311U

CN212632311U - A mixing arrangement for SNCR denitration

Info

Publication number: CN212632311U
Application number: CN202021172485.XU
Authority: CN
Inventors: 程俊华; 祝国亮
Original assignee: Hubei Meichen Environmental Protection Co ltd
Current assignee: Hubei Meichen Environmental Protection Co ltd
Priority date: 2020-06-23
Filing date: 2020-06-23
Publication date: 2021-03-02
Anticipated expiration: 2030-06-23

Abstract

A mixing device for SNCR denitration comprises a dilution water inlet pipe, an ammonia water inlet pipe, a first reducer pipe, a second reducer pipe, an outlet pipe and a spiral mixing mechanism arranged in the outlet pipe; the exit end of dilution water import pipe with first reducing pipe is connected, first reducing pipe connects gradually with second reducing pipe and outlet pipe, the tip of aqueous ammonia import pipe with dilution water import pipe intercommunication, the diameter of first reducing pipe is dwindled progressively from dilution water import pipe towards second reducing pipe direction, the diameter of second reducing pipe is crescent from first reducing pipe towards outlet pipe direction. The utility model discloses the advantage: simple structure, small resistance, good mixing effect and good practicability.

Description

A mixing arrangement for SNCR denitration

Technical Field

The utility model relates to a deNOx systems field, concretely relates to a mixing arrangement for SNCR denitration.

Background

At present, the SNCR denitration mixing arrangement extensively is used for the flue gas environmental protection system of various boilers, and the mixing arrangement's quality directly influences rear end injection system's result of use. Dilution water import pipe, aqueous ammonia import pipe become 90 among the current SNCR denitration mixing arrangement, cause two kinds of liquid to advance when managing, the resistance grow, during pressure is uneven, often appears and can only spout a liquid or do not have the phenomenon of liquid blowout. When only the dilution water is sprayed, NOx is not up to the standard; only when the ammonia comes out, the concentration of the ammonia is too high, and the equipment is corroded. The rear end is not provided with mixing equipment, so that the mixing is uneven, the mixing concentration is influenced, and the denitration efficiency is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the aforesaid not enough, and provide a mixing arrangement for SNCR denitration.

The utility model comprises a dilution water inlet pipe, an ammonia water inlet pipe, a first reducer pipe, a second reducer pipe, an outlet pipe and a spiral mixing mechanism arranged in the outlet pipe;

the outlet end of the dilution water inlet pipe is connected with the first reducer pipe, the first reducer pipe is sequentially connected with the second reducer pipe and the outlet pipe, the end part of the ammonia water inlet pipe is communicated with the dilution water inlet pipe,

the diameter of the first reducing pipe is gradually reduced from the dilution water inlet pipe to the second reducing pipe, and the diameter of the second reducing pipe is gradually increased from the first reducing pipe to the outlet pipe;

the spiral mixing mechanism comprises a plastic straight rod arranged at the center inside the outlet pipe and a plurality of arc-shaped blades connected with the plastic straight rod and the inner wall of the outlet pipe, and the arc-shaped blades are annularly and uniformly distributed to form a mixing channel for supplying dilution water and ammonia water.

The dilution water inlet pipe, the first reducer pipe, the second reducer pipe and the outlet pipe are located on the same central line.

And an included angle of 15-45 degrees is formed between the dilution water inlet pipe and the ammonia water inlet pipe.

The plastic straight rod and the outlet pipe are coaxially arranged.

The plastic straight rod is positioned at the rear half section of the outlet pipe.

The front end of the plastic straight rod is conical.

The utility model discloses the advantage: simple structure, small resistance, good mixing effect and good practicability.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic view of the internal structure of the outlet tube.

Fig. 3 is a side view schematic of the outlet tube.

Detailed Description

The utility model comprises a dilution water inlet pipe 1, an ammonia water inlet pipe 2, a first reducer pipe 3, a second reducer pipe 4, an outlet pipe 6 and a spiral mixing mechanism 5 arranged in the outlet pipe 6;

the outlet end of the dilution water inlet pipe 1 is connected with the first reducer pipe 3, the first reducer pipe 3 is sequentially connected with the second reducer pipe 4 and the outlet pipe 6, the end part of the ammonia water inlet pipe 2 is communicated with the dilution water inlet pipe 1,

the diameter of the first reducing pipe 3 gradually decreases from the dilution water inlet pipe 1 to the second reducing pipe 4, and the diameter of the second reducing pipe 4 gradually increases from the first reducing pipe 3 to the outlet pipe 6;

the spiral mixing mechanism 5 comprises a plastic straight rod 10 arranged at the center inside the outlet pipe 6 and a plurality of arc-shaped blades 12 which connect the plastic straight rod 10 with the inner wall of the outlet pipe 6, and the arc-shaped blades 12 are uniformly distributed in an annular shape to form a mixing channel 13 for supplying dilution water and ammonia water.

The dilution water inlet pipe 1 is located on the same center line as the first reducer pipe 3, the second reducer pipe 4, and the outlet pipe 6.

An included angle of 15-45 degrees is formed between the dilution water inlet pipe 1 and the ammonia water inlet pipe 2.

The plastic straight rod 10 and the outlet pipe 6 are coaxially arranged.

The plastic straight bar 10 is located at the rear half section of the outlet pipe 6.

The front end of the plastic straight rod 10 is conical.

The working mode is as follows: dilution water enters a dilution water inlet pipe 1 through a dilution water pump and a valve set, ammonia water enters an ammonia water inlet pipe 2 through the ammonia water pump and the valve set, and inlet pipes of the two liquids are provided with a certain included angle, so that resistance is reduced, pressure balance is guaranteed, and the two liquids can enter a system at the same time; flows into the first reducing pipe 3 and the second reducing pipe 4, and two liquids are mixed in advance, which is equivalent to primary mixing; the mixture flows into the spiral mixing mechanism 5 at the rear half section of the outlet pipe 6 after the initial mixing, so that the mixing effect is better and the mixing effect is ensured; then enters a subsequent treatment system through an outlet pipe 6; the dilution water inlet pipe 1 and the dilution water outlet pipe 6 are always on the same central line, so that the resistance of the whole device is reduced, and the rear-end liquid injection effect is ensured.

Claims

1. A mixing device for SNCR denitration is characterized by comprising a dilution water inlet pipe (1), an ammonia water inlet pipe (2), a first reducer pipe (3), a second reducer pipe (4), an outlet pipe (6) and a spiral mixing mechanism (5) arranged in the outlet pipe (6);

the outlet end of the dilution water inlet pipe (1) is connected with the first reducer pipe (3), the first reducer pipe (3) is sequentially connected with the second reducer pipe (4) and the outlet pipe (6), the end part of the ammonia water inlet pipe (2) is communicated with the dilution water inlet pipe (1),

the diameter of the first reducer pipe (3) is gradually reduced from the dilution water inlet pipe (1) to the second reducer pipe (4), and the diameter of the second reducer pipe (4) is gradually increased from the first reducer pipe (3) to the outlet pipe (6);

spiral mixing mechanism (5) are including setting up plastics straight-bar (10) and polylith arc blade (12) that are connected plastics straight-bar (10) and outlet pipe (6) inner wall in outlet pipe (6) inside center department, polylith arc blade (12) are annular equipartition and form mixing channel (13) that supply dilution water and aqueous ammonia.

2. A mixing apparatus for SNCR denitration according to claim 1, wherein the dilution water inlet pipe (1) is located on the same center line as the first reducing pipe (3), the second reducing pipe (4) and the outlet pipe (6).

3. A mixing apparatus for SNCR denitration according to claim 1, wherein the dilution water inlet pipe (1) and the ammonia water inlet pipe (2) form an angle of 15-45 ° therebetween.

4. A mixing device for SNCR denitration according to claim 1, characterized in that the plastic straight rod (10) is coaxially arranged with the outlet pipe (6).

5. A mixing device for SNCR denitration according to claim 1, characterized in that the plastic straight bar (10) is located at the rear half of the outlet pipe (6).

6. The mixing device for SNCR denitration according to claim 1, characterized in that the front end of the plastic straight rod (10) is tapered.