Ozone denitration distribution pipe cleaning device

Abstract

The utility model discloses an ozone denitration distribution pipe cleaning device which comprises an alkali liquor spray tower, an ozone generator and supercharging equipment, an inlet flue is arranged at the lower part of the side wall of the alkali liquor spray tower, an outlet flue is arranged at the top of the alkali liquor spray tower, and a plurality of ozone distribution pipes are arranged at the upper part in the alkali liquor spray tower from top to bottom; a plurality of airflow distribution ports are formed in each ozone distribution pipe, an inlet of each ozone distribution pipe is connected with an ozone generator through a pipeline, a flexible expansion pipe is oppositely inserted into an outlet of each ozone distribution pipe, the flexible expansion pipes extend into the ozone distribution pipes, and conical ejector pins corresponding to the airflow distribution ports are arranged on the flexible expansion pipes; the tip of the conical ejector pin is located in the airflow distribution opening, and an inlet of the flexible expansion pipe is connected with supercharging equipment through a pipeline. A cleaning medium enters the cleaning pipeline through the supercharging equipment, the medium is dispersed to the flexible expansion pipe through the cleaning control valve, the flexible expansion pipe expands after being filled with the cleaning medium and shrinks after the cleaning medium is removed, and it is guaranteed that the airflow distribution opening is smooth.

Description

Technical Field

[0001] The utility model relates to the technical field of reducing environmental tail gas nitrogen oxide emissions, in particular to an ozone denitration distribution pipe cleaning device. Background Art

[0002] As an important component of air pollutants, nitrogen oxides pose a serious threat to the environment and human health. Reducing the emission concentration of nitrogen oxides is an important task in the field of environmental protection.

[0003] At present, there are many flue gas denitrification technologies that have been maturely developed and applied, which can be roughly divided into two categories: dry denitrification and wet denitrification: dry denitrification technology uses gaseous reducing agents to reduce nitrogen oxides in flue gas to nitrogen and water, mainly including selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR). Among them, the SCR method uses ammonia as a reducing agent, and different catalysts are adapted to different reaction temperature ranges, generally 200~400℃, and the denitrification efficiency can reach more than 90%. The technology is mature and has the advantages of high denitrification efficiency, no by-products, no secondary pollution, simple device structure, easy maintenance and operation, etc., but there are problems such as high reaction temperature and catalyst deactivation. The SNCR method sprays a reducing agent (urea, ammonia water, etc.) into flue gas at a temperature of 850~1100℃ without using a catalyst, and reacts with nitrogen oxides in the flue gas to generate nitrogen and water. This method has simple equipment, low investment, and does not require a catalyst, but the reaction temperature is high and it is sensitive to the temperature range of the reaction. Improper control will cause ammonia escape, and the denitrification efficiency is low, generally not exceeding 60%. Wet denitrification technology uses liquid to wash and absorb flue gas to achieve the purpose of denitrification. The main methods include alkaline solution absorption method, acid absorption method, complex absorption method, liquid phase absorption reduction method, oxidation absorption method, etc. Among them, the oxidation absorption method is widely used in industrialization. This method uses an oxidant to oxidize the water-insoluble nitrogen monoxide in the flue gas into water-soluble high-valent nitrogen oxides (nitrogen dioxide and nitrogen trioxide), and then uses the solution for absorption. The oxidants that can be used include ozone, hydrogen peroxide, hypochlorite, halogen gas, permanganate, etc. Among them, ozone is considered to be the first choice for oxidative denitrification due to its easy availability and high selectivity. It is suitable for low-temperature flue gas denitrification below 150°C.

[0004] Enterprises usually install ozone generators, and the generated ozone is sent to the alkaline solution spray tower and then dispersed and sprayed into the tower through the denitrification distribution pipe. However, the airflow distribution port of the distribution pipe is in contact with the flue gas. After long-term operation, the dust in the flue gas blocks the airflow distribution port, resulting in the inability of ozone to effectively react with nitrogen oxides, affecting the indicators of nitrogen oxides in environmental exhaust gas, and posing an environmental hazard.

[0005] Therefore, how to reduce the blockage of distribution pipes as much as possible and ensure environmental protection indicators is an issue worth studying. Utility Model Content

[0006] In view of this, the purpose of the present utility model is to provide a cleaning device for an ozone denitrification distribution pipe.

[0007] To achieve the above purpose, the present utility model provides the following technical solutions:

[0008] A cleaning device for an ozone denitrification distribution pipe includes an alkali solution spray tower, an ozone generator, and a pressurization device. An inlet flue is provided at the lower part of the side wall of the alkali solution spray tower, and an outlet flue is provided at the top of the alkali solution spray tower. A plurality of ozone distribution pipes are provided in the upper part of the alkali solution spray tower from top to bottom. A plurality of air flow distribution ports are provided on each ozone distribution pipe. The inlet of the ozone distribution pipe is connected to the ozone generator through a pipeline. Flexible expansion pipes are inserted oppositely at the outlet of each ozone distribution pipe. The flexible expansion pipe extends into the ozone distribution pipe, and a conical thimble is provided on the flexible expansion pipe corresponding to the air flow distribution port. The tip of the conical thimble is inside the air flow distribution port. The inlet of the flexible expansion pipe is connected to the pressurization device through a pipeline.

[0009] Further, a distribution pipe control valve is provided on the ozone branch pipeline outside the alkali solution spray tower.

[0010] Further, a cleaning control valve is provided on the cleaning branch pipeline outside the alkali solution spray tower.

[0011] Further, the flexible expansion pipe is a flexible rubber expansion pipe.

[0012] The flue gas to be treated enters through the inlet flue, contacts and reacts with the ozone ejected from the air flow distribution port, and is sent out through the outlet flue. Ozone is generated by the ozone generator and enters the ozone main pipeline. The ozone is dispersed into multiple ozone pipelines through the distribution pipe control valve and ejected from the air flow distribution ports on the distribution pipe, and reacts with the flue gas to be treated in the alkali solution spray tower. The conical thimble is attached to the surface of the flexible expansion pipe, and the tip of the conical thimble is inside the air flow distribution port. When the flexible expansion pipe expands, the conical thimble extends towards the air flow distribution port to remove the dust attached to the air flow distribution port. After the flexible expansion pipe contracts, it ensures the smoothness of the air flow distribution port. A certain cleaning medium such as water, air, etc. enters the cleaning pipeline through the pressurization device, and the medium is dispersed into the flexible expansion pipe through the cleaning control valve. The flexible expansion pipe expands after being filled with the cleaning medium and contracts after removing the cleaning medium.

[0013] When the ozone denitrification distribution pipe needs to be cleaned, single - pipe cleaning is adjusted through the distribution pipe control valve and the cleaning control valve. Other distribution pipes still transport ozone normally, ensuring the indicators while cleaning. During the expansion and contraction process of the flexible expansion pipe, the conical thimble removes the dust at the air flow distribution ports on the distribution pipe, ensuring the normal outflow of ozone gas and efficient reaction with the flue gas, and eliminating environmental protection hazards. Description of the Drawings

[0014] Figure 1It is the front view schematic diagram of the utility model;

[0015] Figure 2 It is the internal structure schematic diagram of the ozone branch pipe;

[0016] In the figure, 1. Distribution pipe control valve, 2. Air flow distribution port, 3. Ozone main pipe, 31. Ozone distribution pipe, 32. Ozone pipe branch, 4. Ozone generator, 5. Booster equipment, 6. Inlet flue, 7. Cleaning main pipe, 71. Cleaning branch pipe, 8. Alkaline solution spray tower, 9. Cleaning control valve, 10. Outlet flue, 11. Conical thimble, 12. Flexible expansion pipe. Specific implementation mode

[0017] The technical solution of the present utility model will be further described in detail below with reference to the accompanying drawings, but the protection scope of the present utility model is not limited thereto.

[0018] An ozone denitrification distribution pipe cleaning device, as Figure 1 and 2 shown, includes an alkaline solution spray tower 8, an ozone generator 4 and a booster equipment 5. The lower part of the side wall of the alkaline solution spray tower 8 is provided with an inlet flue, the top of the alkaline solution spray tower 8 is provided with an outlet flue, and several ozone distribution pipes 31 are arranged from top to bottom in the upper part of the alkaline solution spray tower 8. Each ozone distribution pipe 31 is provided with several air flow distribution ports 2. The inlet of the ozone distribution pipe 31 is connected to the ozone branch pipe 32, and the ozone branch pipes 32 are connected in parallel to the ozone main pipe 3. The ozone main pipe 3 is connected to the ozone generator 4. Oppositely inserted at the outlet of each ozone distribution pipe 31 is a flexible expansion pipe 12. The flexible expansion pipe 12 extends into the ozone distribution pipe 31, and a conical thimble 11 is provided on the flexible expansion pipe 12 corresponding to the air flow distribution port 2, and the tip of the conical thimble 11 is located in the air flow distribution port 2. The inlet of the flexible expansion pipe 12 is connected in parallel to the cleaning main pipe 7 through the cleaning branch pipe 71. The inlet of the cleaning main pipe 7 is connected to the booster equipment 5. A distribution pipe control valve 1 is provided on the ozone branch pipe 32 outside the alkaline solution spray tower 8, and a cleaning control valve 9 is provided on the cleaning branch pipe 71 outside the alkaline solution spray tower 8. The flexible expansion pipe 12 is made of a flexible rubber expansion pipe.

[0019] In practice, the flue gas to be treated enters the alkaline solution spray tower 8 through the inlet flue 6, contacts and reacts with the ozone ejected from the air flow distribution port 2, and is sent out through the outlet flue 10.

[0020] The ozone is generated by the ozone generator 4 and enters the ozone main pipe 3. The ozone is dispersed into multiple ozone branch pipes 32 through the distribution pipe control valve 1 and ejected from the air flow distribution ports 2 on the ozone distribution pipe 31 to react with the flue gas to be treated in the alkaline solution spray tower 8.

[0021] The conical thimble 11 is attached to the surface of the flexible expansion tube 12, and the tip of the conical thimble 11 is located inside the air flow distribution port 2. When the flexible expansion tube 12 expands, the conical thimble 11 extends towards the air flow distribution port 2 to remove the dust attached to the air flow distribution port 2. After the flexible expansion tube 12 contracts, the air flow distribution port 2 is ensured to be unobstructed.

[0022] A certain cleaning medium such as water, air, etc. enters the cleaning pipeline through the pressurization device 5, and the medium is dispersed to the flexible expansion tube 12 through the cleaning control valve 9. After the flexible expansion tube 12 is filled with the cleaning medium, it expands and contracts after removing the cleaning medium.

[0023] When the ozone denitration distribution pipe 31 needs to be cleaned, single - pipe cleaning is adjusted through the distribution pipe control valve 1 and the cleaning control valve 9, and other distribution pipes still transport ozone normally, ensuring the indicators while cleaning. During the expansion and contraction process of the flexible expansion tube 12, the conical thimble 11 removes the dust on the air flow distribution port of the distribution pipe 31, ensuring the normal outflow of ozone gas and efficient reaction with the flue gas, and eliminating environmental protection hidden dangers.

[0024] Finally, it should be noted that the above - mentioned embodiments are only used to illustrate the specific implementation technical solutions of the present invention rather than to limit it. Those of ordinary skill in the art should understand that any equivalent substitution or obvious modification of the implementation manner of the present invention without changing its performance or use should be covered within the scope of protection claimed by the present invention under the premise of not violating the purpose of the present invention.

Claims

1. An ozone denitrification distribution pipe cleaning device, characterized in that: It comprises an alkali liquid spray tower, an ozone generator and a booster device. An inlet flue is arranged at the lower part of the side wall of the alkali liquid spray tower, an outlet flue is arranged at the top of the alkali liquid spray tower, a plurality of ozone distribution pipes are arranged at the upper part of the alkali liquid spray tower from top to bottom, a plurality of airflow distribution ports are arranged on each ozone distribution pipe, the inlet of the ozone distribution pipe is connected with the ozone generator through a pipeline, flexible expansion pipes are inserted at the outlet of each ozone distribution pipe in opposite directions, the flexible expansion pipes extend into the ozone distribution pipes, a conical ejector pin is arranged on the flexible expansion pipe corresponding to the airflow distribution port, the tip of the conical ejector pin is in the airflow distribution port, and the inlet of the flexible expansion pipe is connected with the booster device through a pipeline.

2. The ozone denitrification distribution pipe cleaning device according to claim 1, characterized in that: A distribution pipe control valve is provided on the ozone branch pipe outside the alkali solution spray tower.

3. The ozone denitrification distribution pipe cleaning device according to claim 1, characterized in that: A cleaning control valve is provided on the cleaning branch pipe outside the alkali solution spray tower.

4. The ozone denitrification distribution pipe cleaning device according to claim 1, characterized in that: The flexible expansion tube is a flexible rubber expansion tube.

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