Air inlet pipe structure of denitration tower

Abstract

The utility model discloses a denitration tower air inlet pipe structure, which relates to the technical field of air inlet pipes, and comprises a flue gas pipeline, the flue gas pipeline consists of an air inlet pipe and a U-shaped pipe, the air inlet pipe is connected with one end of the U-shaped pipe, the other end of the U-shaped pipe is communicated with the side wall of a denitration tower, a discharge pipe is arranged at the bottom of the U-shaped pipe, and the discharge pipe is communicated with the flue gas pipeline. The discharge pipe can be closed or opened, a valve is arranged on the air inlet pipe, a water inlet pipe is arranged at the position, corresponding to the position between the valve and the U-shaped pipe, of the air inlet pipe, and the water inlet pipe is connected with an external water supply system. Ammonia enters the U-shaped pipe from the denitration tower to the bottom and enters the discharge pipe for unified treatment, ammonia water is prevented from stopping in the flue gas pipeline to cause corrosion, the valve is closed, the water inlet pipe is connected with an external water supply system, the U-shaped pipe can be cleaned by introducing clear water, and the cleanliness of the flue gas pipeline is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of air intake pipes, in particular to an air intake pipe structure for a denitration tower. Background Art

[0002] The main working principle of the denitrification tower is to remove nitrogen oxides (NOx) from flue gas through chemical reactions. Specifically, the denitrification agent (usually ammonia or urea, ammonia is used as an example below) in the denitrification tower will be sprayed into the flue gas. After these denitrification agents react with nitrogen oxides in the flue gas, they will convert them into harmless substances such as nitrogen and oxygen.

[0003] The air inlet pipe of the denitrification tower is the pipe for flue gas input, and is generally made of metal materials such as carbon steel. At present, the air inlet pipe is set horizontally and directly connected to the denitrification tower. When the flue gas is introduced, the inward airflow can prevent ammonia from entering the air inlet pipe. However, when the denitrification tower is working, the spray system is generally turned on first, and the ammonia is sprayed first. The flue gas is introduced through the air inlet pipe for denitrification treatment. When the treatment is completed, the air inlet pipe is closed first, and then the spray system is closed. When the spray system is turned on first and then closed, there is no inward airflow in the air inlet pipe, and there will be ammonia or urea splashing or flowing into the air inlet along the side wall of the denitrification tower. Ammonia or urea is corrosive to metals, especially carbon steel air inlet pipes. Over time and the accumulation of denitrification agents will cause certain damage to the pipes, making repair and maintenance difficult and affecting their service life. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the utility model provides a denitrification tower air inlet pipe structure, in which ammonia enters the U-shaped pipe from the denitrification tower to the bottom and enters the discharge pipe for unified treatment, thereby preventing ammonia water from staying in the flue gas pipe and causing corrosion. The valve is closed, the water inlet pipe is connected to the external water supply system, and clean water is passed in to clean the U-shaped pipe, thereby ensuring the cleanliness of the flue gas pipe.

[0005] To achieve the above objectives, the utility model is implemented through the following technical solutions: a denitrification tower air inlet pipe structure, including a flue gas duct, the flue gas duct is composed of an air inlet pipe and a U-shaped pipe, the air inlet pipe is connected to one end of the U-shaped pipe, and the other end of the U-shaped pipe is connected to the side wall of the denitrification tower, a discharge pipe is arranged at the bottom of the U-shaped pipe, the discharge pipe can be closed or opened, a valve is arranged on the air inlet pipe, and a water inlet pipe is arranged at a position between the air inlet pipe corresponding to the valve and the U-shaped pipe, and the water inlet pipe is connected to an external water supply system.

[0006] Preferably, the bottom of the discharge pipe is through, and a receiving box is detachably provided at the bottom of the discharge pipe.

[0007] Preferably, the inner wall of the receiving box is connected to the outer wall of the discharge pipe by means of threads.

[0008] Preferably, the discharge pipe and the receiving box are both made of polyethylene material.

[0009] The utility model provides a denitration tower air inlet pipe structure, which has the following beneficial effects:

[0010] 1. The ammonia gas of the utility model enters the U-shaped tube from the denitrification tower to the bottom, and enters the discharge pipe for unified treatment, so as to avoid ammonia water staying in the flue gas pipeline and causing corrosion; close the valve, connect the water inlet pipe to the external water supply system, and pass clean water to clean the U-shaped tube, so as to ensure the cleanliness of the flue gas pipeline, avoid corrosion, and prolong the service life of the flue gas pipeline;

[0011] 2. In the utility model, the bottom of the discharge pipe is opened and sealed by screwing on the receiving box, and the ammonia water can be stored in the receiving box. Removing the receiving box also avoids the spillage of the ammonia water. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a front cross-sectional view of an air inlet pipe structure of a denitration tower according to the utility model.

[0013] In the figure: 1. Denitrification tower; 2. Air inlet pipe; 3. Valve; 4. U-shaped pipe; 5. Discharge pipe; 6. Socket box; 7. Water inlet pipe. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0015] like Figure 1 As shown, a denitrification tower air inlet pipe structure includes a flue gas duct, which is composed of an air inlet pipe 2 and a U-shaped pipe 4. The air inlet pipe 2 is connected to one end of the U-shaped pipe 4, and the other end of the U-shaped pipe 4 is connected to the side wall of the denitrification tower 1. A discharge pipe 5 is arranged at the bottom of the U-shaped pipe 4, and the discharge pipe 5 can be closed or opened. A valve 3 is arranged on the air inlet pipe 2, and a water inlet pipe 7 is arranged at a position between the air inlet pipe 2 corresponding to the valve 3 and the U-shaped pipe 4, and the water inlet pipe 7 is connected to an external water supply system; the bottom of the discharge pipe 5 is through, and a receiving box 6 is detachably arranged at the bottom of the discharge pipe 5; the inner wall of the receiving box 6 is connected to the outer wall of the discharge pipe 5 by threaded connection; the discharge pipe 5 and the receiving box 6 are both made of polyethylene material.

[0016] The detailed connection means are well-known in the art. The following mainly introduces the working principle and process, which are as follows:

[0017] According to the instruction manual Figure 1 It can be known that when the utility model is working, the water inlet pipe 7 on the air inlet pipe 2 is closed, the discharge pipe 5 is sealed, the air inlet pipe 2 in the flue gas duct passes the flue gas through the U-shaped pipe 4 and enters the denitrification tower 1. The drawings in the specification only show the side wall of the denitrification tower 1 to represent the denitrification tower 1. The denitrification tower 1 is a prior art and will not be described in detail here.

[0018] Before the flue gas is introduced, the spray system must be turned on first, and the ammonia water is sprayed first. At this time, part of the ammonia water will flow into the U-shaped tube 4 due to sputtering or along the side wall of the denitrification tower 1. The same problem occurs. After the flue gas treatment is completed, the air intake pipe 2 is closed first, and then the spray system is closed. During this process, part of the ammonia water will enter the U-shaped tube 4. Due to the shape of the U-shaped tube 4 itself, the ammonia water entering the U-shaped tube 4 will slide to the bottom and enter the discharge pipe 5 for temporary storage. After the work is completed or the discharge pipe 5 is opened regularly to discharge the ammonia water to avoid ammonia water staying in the flue gas pipeline and causing corrosion. In order to further clean the ammonia water stuck on the inner wall of the U-shaped tube 4, after the flue gas treatment is completed, the valve 3 on the air intake pipe 2 is closed, the discharge pipe 5 is closed, and water is injected into the water inlet pipe 7 through the external water supply system. The U-shaped tube 4 is flushed with clean water. The clean water after flushing enters the denitrification tower 1 for unified treatment. After flushing, the U-shaped tube 4 is cleaner, corrosion is avoided, and the service life of the flue gas pipeline is increased.

[0019] The bottom of the discharge pipe 5 is through, and a receiving box 6 is detachably provided at the bottom of the discharge pipe 5. Specifically, a threaded connection can be adopted, and the internal thread of the inner wall of the receiving box 6 is screwed and connected with the external thread of the outer wall of the discharge pipe 5, which is convenient for disassembly and installation, and convenient for cleaning ammonia water.

[0020] The discharge pipe 5 and the receiving box 6 are both made of polyethylene material, which is corrosion-resistant.

[0021] In addition, the intake pipe 2 and the U-shaped pipe 4 are optimally designed as an integrated design, and can also be connected by welding.

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

Claims

1. A denitration tower air inlet pipe structure, characterized in that: The invention comprises a flue gas duct, wherein the flue gas duct is composed of an air intake pipe (2) and a U-shaped pipe (4), wherein the air intake pipe (2) is connected to one end of the U-shaped pipe (4), and the other end of the U-shaped pipe (4) is connected to the side wall of a denitration tower (1), and a discharge pipe (5) is arranged at the bottom of the U-shaped pipe (4), and the discharge pipe (5) can be closed or opened, and a valve (3) is arranged on the air intake pipe (2), and a water inlet pipe (7) is arranged at a position between the air intake pipe (2) corresponding to the valve (3) and the U-shaped pipe (4), and the water inlet pipe (7) is connected to an external water supply system.

2. A denitration tower air inlet pipe structure according to claim 1, characterized in that: The bottom of the discharge pipe (5) is through-connected, and a receiving box (6) is detachably provided at the bottom of the discharge pipe (5).

3. A denitration tower air inlet pipe structure according to claim 2, characterized in that: The inner wall of the receiving box (6) is connected to the outer wall of the discharge pipe (5) by screw thread.

4. A denitration tower air inlet pipe structure according to claim 1, characterized in that: The discharge pipe (5) and the receiving box (6) are both made of polyethylene material.

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