Wet desulphurization oxidation air uniform distribution device

Abstract

The utility model relates to the technical field of wet flue gas desulfurization, and discloses a wet desulfurization oxidation air uniform distribution device which comprises an oxidation air diffusion pipe and a side-entering stirrer which are arranged on a desulfurization tower, an oxidation air injection section is arranged on the oxidation air diffusion pipe, and a plurality of air outlet micropores are formed in the oxidation air injection section; a first connecting pipe and a second connecting pipe are further arranged on the desulfurizing tower, the first connecting pipe and the second connecting pipe are communicated with the two ends of the oxidation air diffusion pipe respectively, and monitoring assemblies used for monitoring the pressure in the oxidation air diffusion pipe are arranged on the first connecting pipe and the second connecting pipe; according to the utility model, through the arrangement of the air outlet micropores, the air outlet micropores can ensure that oxidation air does not form large bubbles, the diffusion of the small bubbles in the slurry pool of the desulfurization tower can be ensured by matching with the propulsive force function of the side-entering stirrer, and the device has the advantages that the formed oxidation air bubbles are small, the diffusion efficiency is high, and the slurry oxidation efficiency can be effectively improved.

Description

Technical Field

[0001] The utility model relates to a wet desulfurization oxidation wind uniform distribution device, belonging to the technical field of wet flue gas desulfurization. Background Art

[0002] Limestone-gypsum wet flue gas desulfurization (WFGD) is the most widely used desulfurization technology in China. It is mature, highly reliable and widely applicable. It has always been the leading technology among many desulfurization technologies, accounting for more than 80% of the total installed capacity of desulfurization. As one of the important subsystems of WFGD, the correctness of the selection and design of the oxidation air system is directly related to the performance of the entire desulfurization system.

[0003] In the wet desulfurization process, in order to force the oxidation of sulfite generated by the desulfurization reaction into sulfate, it is necessary to introduce an excess of compressed air (also called oxidation air) into the desulfurized slurry to force oxidation of the slurry. At present, the lance gun type and pipe network type are generally used in the layout of oxidation air in the desulfurization tower. When a side-entry agitator is used to disturb the slurry, the layout of the oxidation air spear gun is generally matched, that is, an opening is opened above the agitator, and an oxidation air pipe is inserted obliquely from it and connected to the front of the agitator blade. The disturbance thrust of the blade on the slurry is used to break up the large amount of oxidation air entering the slurry and push it to various parts of the slurry pool. In this process, the oxidation air is evenly distributed in the slurry pool and the slurry is forced to oxidize and contact (for details, please see Figure 1 and Figure 2 ). However, in actual use, it is found that the area of ​​oxidized air produced by this type of structure is small, which has certain limitations. In addition, in terms of the layout of oxidized air, the oxidized air duct network is basically arranged in the tower, and the air volume is controlled by variable frequency regulation of the oxidized air fan. There is no corresponding measurement and adjustment measure for a single nozzle, which is inconvenient to use.

[0004] The utility model patent with the Chinese patent authorization announcement number CN204816210U discloses a desulfurization oxidation air duct device. In order to increase the diffusion area of ​​the oxidation air, the device opens ventilation holes with a diameter of 15 mm on both sides of the lower outlet of the air spear gun to increase the outlet area of ​​the oxidation air duct. However, due to structural limitations, after the oxidation air comes out of the duct, a large number of large bubbles are still ejected from the lower part of the spear gun, and the specific surface area in contact with the slurry is small. It is necessary to use the side agitator of the absorption tower to further disperse them. The effect of the agitator blade on the dispersion of bubbles is related to the installation precision arrangement. When the angle arrangement of the side agitator deviates, the oxidation air cannot be dispersed into fine bubbles, which is not conducive to the uniform distribution of the oxidation air in the slurry pool, and directly affects the utilization rate of the oxidation air and the oxidation effect of the slurry. In addition, since the oxidation air duct is inserted obliquely from the top of the agitator and then installed vertically downward, it presents a long cantilever state in the slurry, and is subject to a large impact force of the slurry flow, which is prone to vibration and wear. Although support beams are set, there are still operational feedbacks. Occasionally, the oxidation air spear gun is found to be broken and the support falls off during shutdown and maintenance. Such problems are difficult to find during daily equipment inspections and can generally only be found during the emptying inspection of the desulfurization tower, which is not conducive to the stability of system operation. In addition, since the side agitator of the absorption tower needs to consider the function of breaking up the oxidation air, the side agitator of the absorption tower has a larger power in the selection, resulting in a certain increase in energy consumption.

[0005] The utility model patent with the Chinese patent authorization announcement number CN212215113U discloses a new simple oxidation air system for wet flue gas desulfurization. The system uses compressed air as the oxidation air source, sets up a pipe network in the desulfurization tower, and evenly arranges nozzles in the pipe network. The system solves the problem of the distribution of oxidation air in the absorption tower to a certain extent, but because it takes into account the turbulence of the desulfurization tower, the nozzle diameter on the pipe network is large, and large bubbles will be formed in the jet. And because there is no stirring system in the tower, there is no way to break up the large bubbles and distribute them evenly for a second time, and the slurry pool in the tower may form an oxidation blind area. In addition, although the oxidation air main pipe outside the tower is equipped with a pressure transmitter and a pressure reducing valve, the pressure of the main pipe can be adjusted by displaying the value of the pressure transmitter, but the branch pipe in the tower cannot be monitored in real time.

[0006] The invention patent application with the Chinese patent application publication number CN116422118A discloses a flue gas desulfurization oxidation air system and its use method. The system adopts an oxidation air pipe network layout, monitors the oxidation degree of the slurry in real time through the OPR online measurement system, and simultaneously adjusts the number of oxidation air pipe network branches in real time according to the system load, and adjusts the oxidation air volume through the oxidation fan frequency conversion. The system solves the problem of distribution and diffusion of oxidation air in the tower, forms a large number of small bubbles in the tower, and can monitor the oxidation degree of the slurry in the tower in real time. However, the system cannot ensure the distribution of oxidation air in a single branch. In addition, when a single branch is cut off at low load, the branch pipe in the tower will be blocked due to the backflow of slurry, and it will not be able to be put into use again when it is put into operation again.

[0007] Based on this, we provide an arc-shaped oxidation air injection pipe that can effectively improve the slurry oxidation efficiency, and match it with local control instruments and operating valves to optimize the uniform distribution of oxidation air. Utility Model Content

[0008] In order to solve the above problems existing in the prior art, the utility model provides a wet desulfurization oxidation air uniform distribution device.

[0009] The technical solution of the utility model is as follows:

[0010] A wet desulfurization oxidation air uniform distribution device comprises an oxidation air diffusion pipe and a side-entry agitator arranged on a desulfurization tower, characterized in that: an oxidation air injection section is arranged on the oxidation air diffusion pipe, and a plurality of air outlet micropores are opened on the oxidation air injection section; a first connecting pipe and a second connecting pipe are also arranged on the desulfurization tower, and the first connecting pipe and the second connecting pipe are respectively connected to the two ends of the oxidation air diffusion pipe, and a monitoring component for monitoring the pressure in the oxidation air diffusion pipe is arranged on the first connecting pipe and the second connecting pipe.

[0011] Wherein, each of the air outlet microholes is a conical countersunk hole with an aperture of -mm, and the taper angle of each air outlet microhole is degrees.

[0012] The oxidizing air diffusion pipe is arranged inside the desulfurization tower, the side-entry agitator is arranged on the outer wall of the desulfurization tower, and the agitating section of the side-entry agitator is arranged close to the oxidizing air injection section after extending into the desulfurization tower.

[0013] Wherein, the oxidation air diffusion pipe is arranged in an arc-shaped structure, and the cross section of the oxidation air diffusion pipe is arranged in a streamlined structure.

[0014] Wherein, each of the air outlet microholes is arranged at the lower side wall of the oxidation air injection section.

[0015] Wherein, the monitoring component includes an air regulating valve arranged on the first connecting pipe and a check valve arranged on the second connecting pipe, the check valve is provided with a pressure transmitter, and the air regulating valve and the pressure transmitter are rigidly connected together.

[0016] Wherein, the side wall of the first connecting pipe is also connected to a water inlet pipe, and a flushing valve is arranged on the water inlet pipe.

[0017] Wherein, the side wall of the second connecting pipe is also connected with a sewage pipe, and a sewage valve is arranged on the sewage pipe.

[0018] Wherein, a connecting assembly is provided on the desulfurization tower, and the two ends of the oxidation air diffusion pipe are connected to the desulfurization tower by means of the connecting assembly, and the first connecting pipe and the second connecting pipe are connected to the desulfurization tower by means of the connecting assembly and then communicated with the oxidation air diffusion pipe.

[0019] Wherein, the connecting assembly includes a first connecting pipe opening and a second connecting pipe opening pre-buried in the wall of the desulfurization tower, one end of the first connecting pipe opening is connected to the first connecting pipe, and the other end is connected to one end of the oxidation air diffusion pipe through a first auxiliary connecting pipe, and one end of the second connecting pipe opening is connected to the second connecting pipe, and the other end is connected to the other end of the oxidation air diffusion pipe through a second auxiliary connecting pipe.

[0020] The utility model has the following beneficial effects:

[0021] 1. The utility model sets the oxidation air diffusion tube into an arc structure and connects its two ends to the tower wall of the desulfurization tower, so that the rigidity of the oxidation air diffusion tube can be ensured without the traditional pipe support. At the same time, an oxidation air injection section is arranged on the oxidation air diffusion tube, and air outlet micropores are arranged on the oxidation air injection section. The air outlet micropores can ensure that the oxidation wind does not form large bubbles. Combined with the propulsion function of the side-entry agitator, the diffusion of tiny bubbles in the slurry pool of the desulfurization tower can be ensured. Compared with the prior art, the utility model has the advantages of small oxidation air bubbles, high diffusion efficiency, and can effectively improve the oxidation efficiency of the slurry.

[0022] 2. The utility model can monitor the wind pressure in a single oxidation air diffusion tube in real time by arranging an air regulating valve, a maintenance valve and a pressure transmitter, and the air regulating valve can be adjusted accordingly according to the pressure value detected by the pressure transmitter, thereby ensuring the pressure balance in the oxidation air diffusion tube. In the scenario of using multiple oxidation air diffusion tubes, the air volume in each oxidation air diffusion tube can be balanced, which has the advantage of ensuring uniform distribution of oxidation air. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the oxidation air arrangement of the desulfurization tower in the prior art;

[0024] Figure 2 It is a schematic diagram of the structure of the oxidation air spear gun of the desulfurization tower in the prior art;

[0025] Figure 3 It is a front view of the utility model;

[0026] Figure 4 It is a top view of the utility model;

[0027] Figure 5 It is a cross-sectional view of the oxidation air diffusion tube in the utility model;

[0028] Figure 6 This is an enlarged view of point A.

[0029] The reference numerals in the figure are as follows:

[0030] 1. Desulfurization tower; 2. Oxidation air diffusion pipe; 3. Side-entry mixer; 4. Oxidation air injection section; 5. Air outlet micropores; 6. First connecting pipe; 7. Second connecting pipe; 8. Air regulating valve; 9. Inspection valve; 10. Pressure transmitter; 11. Water inlet pipe; 12. Flushing valve; 13. Drain pipe; 14. Drain valve; 15. First connecting pipe port; 16. Second connecting pipe port; 17. First auxiliary connecting pipe; 18. Second auxiliary connecting pipe. DETAILED DESCRIPTION

[0031] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] Example: Please refer to Figures 3 to 6 , This embodiment provides a wet desulfurization oxidation air uniform distribution device, including an oxidation air diffusion pipe 2 arranged in an arc-shaped structure inside the desulfurization tower 1. The number of oxidation air diffusion pipes 2 arranged inside the desulfurization tower 1 can be determined according to specific circumstances. This embodiment does not limit it. The layout of each oxidation air diffusion pipe 2 on the same desulfurization tower 1 is the same. Both ends of the oxidation air diffusion pipe 2 are connected to the tower wall of the desulfurization tower 1, and the oxidation air diffusion pipe 2 is arranged horizontally inside the desulfurization tower 1. In this embodiment, a connecting assembly is arranged on the tower wall of the desulfurization tower 1, and the connecting assembly includes a first connecting pipe opening 15 and a second connecting pipe opening 16 pre-buried on the tower wall of the desulfurization tower 1. The end of the first connecting pipe opening 15 close to the inside of the desulfurization tower 1 is connected to one end of the oxidation air diffusion pipe 2 through a fixed first auxiliary connecting pipe 17, and the end of the second connecting pipe opening 16 close to the inside of the desulfurization tower 1 is connected to the other end of the oxidation air diffusion pipe 2 through a fixed second auxiliary connecting pipe 18. The oxidizing air diffusion pipe 2 can be fixedly connected to the tower wall of the desulfurization tower 1 by connecting with the first connecting pipe opening 15, the first auxiliary connecting pipe 17, the second connecting pipe opening 16 and the second auxiliary connecting pipe 18, without the need for a traditional pipe support.

[0033] A side-entry agitator 3 is provided on the outer wall of the desulfurization tower 1. The stirring section of the side-entry agitator 3 is arranged close to the inner arc portion of the oxidation air diffusion tube 2 after extending into the desulfurization tower 1, so as to stir the slurry at the inner arc portion of the oxidation air diffusion tube 2, thereby meeting the subsequent oxidation air diffusion requirements. An oxidation air injection section 4 is provided on the oxidation air diffusion tube 2. In this embodiment, the oxidation air injection section 4 is arranged close to the stirring section of the side-entry agitator 3, so as to be within the slurry flow range caused by the stirring section of the side-entry agitator 3, thereby meeting the subsequent oxidation air diffusion requirements.

[0034] A plurality of air outlet micropores 5 are provided on the oxidation air injection section 4. In this embodiment, the number of the air outlet micropores 5 can be determined according to actual conditions. The air outlet micropores 5 are arranged on the oxidation air injection section 4 according to the arc of the oxidation air diffusion tube 2. Each air outlet micropore 5 is arranged at the lower side wall of the oxidation air injection section 4 to avoid the method of facing the slurry. Each air outlet micropore 5 is a conical countersunk hole with an aperture of 8-12 mm, and the taper angle of each air outlet micropore 5 is 90°. In this embodiment, the aperture arrangement of the air outlet micropores 5 can be arranged from large to small along the direction of the slurry flow, so as to ensure that the oxidation air flowing out of the air outlet micropores 5 will be smoothly taken away by the slurry flow, and the slurry can be prevented from flowing back into the oxidation air diffusion tube 2.

[0035] In this embodiment, the oxidation air diffusion tube 2 is configured to have a streamlined cross-section structure to reduce the wear caused by the impact of the slurry flow; at the same time, the oxidation air diffusion tube 2 can be configured to have a vertically symmetrical structure to reduce the difficulty of processing. Through the above configuration, after the slurry flow passes through the surface of the oxidation air diffusion tube 2, it will be affected by the streamlined structure and form a relative negative pressure in the latter half, which will pressurize the oxidation air flowing out of the air outlet micropores 5, thereby further ensuring the distribution of the oxidation air in the slurry.

[0036] The desulfurization tower 1 is also provided with a first connecting pipe 6 and a second connecting pipe 7. The end of the first connecting pipe opening 15 away from the inside of the desulfurization tower 1 is connected to the first connecting pipe 6, and the end of the second connecting pipe opening 16 away from the inside of the desulfurization tower 1 is connected to the second connecting pipe 7. The first connecting pipe 6 can be connected to the oxidation air diffusion pipe 2 by connecting the first connecting pipe opening 15 and the first auxiliary connecting pipe 17, and the second connecting pipe 7 can be connected to the oxidation air diffusion pipe 2 by connecting the second connecting pipe opening 16 and the second auxiliary connecting pipe 18. The first connecting pipe 6 is connected to an external oxidation fan, and the first connecting pipe 6 and the second connecting pipe 7 are also provided with a monitoring component for monitoring the pressure in the oxidation air diffusion pipe 2. The monitoring component includes an air regulating valve 8 provided on the first connecting pipe 6 and a check valve 9 provided on the second connecting pipe 7. The check valve 9 is provided with a pressure transmitter 10. The air regulating valve 8 and the pressure transmitter 10 are rigidly connected together, and the air regulating valve 8 can adjust its opening according to the pressure value detected by the pressure transmitter 10.

[0037] For the convenience of subsequent use, the side wall of the first connecting pipe 6 is also connected to a water inlet pipe 11, which is connected to an external flushing water pump and is provided with a flushing valve 12. The side wall of the second connecting pipe 7 is also connected to a sewage pipe 13, which is provided with a sewage valve 14.

[0038] The method of using this embodiment includes the following steps:

[0039] The first step is to start the external oxidation fan and open the air regulating valve 8. During the initial operation, the opening of the air regulating valve 8 is set to 100%.

[0040] Step 2: After the system is running stably, the data collected by the pressure transmitter 10 are compared. Taking the intermediate value as the benchmark, the opening of the air regulating valve 8 can be adjusted by intervening in the external DCS system, so that the values ​​displayed by the pressure transmitter 10 on each oxidation air diffusion pipe 2 are basically consistent, so as to ensure that the oxidation air volume in each oxidation air diffusion pipe 2 on the desulfurization tower 1 is basically close, to ensure a reasonable wind speed at the oxidation air distribution pipe spray hole, to ensure uniform diffusion, and to improve the oxidation effect.

[0041] Step 3: During operation, the pressure transmitter 10 can be monitored in real time by intervening in the external DCS system. When it is found that the value displayed by the pressure transmitter 10 increases abnormally, forced flushing is performed. Timed flushing can also be set, such as every 7 days as a cycle, each oxidation air diffusion tube 2 as a unit, and flushing in batches. The flushing control sequence is: close the air regulating valve 8, open the flushing valve 12, and start the external flushing water pump. After flushing for 30 seconds, close the flushing valve 12, and re-execute the first and second steps to adjust the pressure balance in the oxidation air diffusion tube 2.

[0042] Step 4: Open the drain valve 14 regularly to check whether slurry has entered the oxidation air diffusion pipe 2. If yes, execute step 3.

[0043] Step 5: When the system is shut down, it is not allowed to close the air regulating valve 8 before the liquid level in the absorption tower is emptied. When the liquid level is emptied, turn off the oxidation fan, close the air regulating valve 8, start the flushing water pump, open the flushing valve 12, and close the flushing valve 12 after flushing for 30 seconds.

[0044] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A wet desulfurization oxidation air uniform distribution device, comprising an oxidation air diffusion pipe (2) and a side-entry mixer (3) arranged on a desulfurization tower (1), characterized in that: An oxidizing air diffusion pipe (2) is provided with an oxidizing air injection section (4), and a plurality of air outlet micropores (5) are provided on the oxidizing air injection section (4); a first connecting pipe (6) and a second connecting pipe (7) are also provided on the desulfurization tower (1), and the first connecting pipe (6) and the second connecting pipe (7) are respectively connected to the two ends of the oxidizing air diffusion pipe (2), and a monitoring component for monitoring the pressure in the oxidizing air diffusion pipe (2) is provided on the first connecting pipe (6) and the second connecting pipe (7).

2. A wet desulfurization oxidation air uniform distribution device according to claim 1, characterized in that: Each of the air outlet microholes (5) is a conical countersunk hole with a hole diameter of 8-12 mm, and the taper angle of each of the air outlet microholes (5) is 90°.

3. A wet desulfurization oxidation air uniform distribution device according to claim 1, characterized in that: The oxidation air diffusion pipe (2) is arranged inside the desulfurization tower (1), the side-entry agitator (3) is arranged on the outer wall of the desulfurization tower (1), and the agitation section of the side-entry agitator (3) extends into the desulfurization tower (1) and is arranged close to the oxidation air injection section (4).

4. A wet desulfurization oxidation air uniform distribution device according to claim 1, characterized in that: The oxidation air diffusion pipe (2) is arranged in an arc-shaped structure, and the cross section of the oxidation air diffusion pipe (2) is arranged in a streamlined structure.

5. A wet desulfurization oxidation air uniform distribution device according to any one of claims 1 to 4, characterized in that: Each of the air outlet microholes (5) is arranged at the lower side wall of the oxidation air injection section (4).

6. A wet desulfurization oxidation air uniform distribution device according to claim 1, characterized in that: The monitoring assembly comprises an air regulating valve (8) arranged on the first connecting pipe (6) and a check valve (9) arranged on the second connecting pipe (7); a pressure transmitter (10) is arranged on the check valve (9); and the air regulating valve (8) and the pressure transmitter (10) are rigidly connected together.

7. A wet desulfurization oxidation air uniform distribution device according to claim 6, characterized in that: The side wall of the first connecting pipe (6) is also connected to a water inlet pipe (11), and a flushing valve (12) is provided on the water inlet pipe (11).

8. The wet desulfurization oxidation air uniform distribution device according to claim 6, characterized in that: The side wall of the second connecting pipe (7) is also connected to a sewage pipe (13), and a sewage valve (14) is provided on the sewage pipe (13).

9. A wet desulfurization oxidation air uniform distribution device according to any one of claims 6 to 8, characterized in that: The desulfurization tower (1) is provided with a connection assembly, and the two ends of the oxidation air diffusion pipe (2) are connected to the desulfurization tower (1) by means of the connection assembly. The first connection pipe (6) and the second connection pipe (7) are connected to the desulfurization tower (1) by means of the connection assembly and then communicated with the oxidation air diffusion pipe (2).

10. A wet desulfurization oxidation air uniform distribution device according to claim 9, characterized in that: The connection assembly comprises a first connection pipe opening (15) and a second connection pipe opening (16) pre-buried on the wall of the desulfurization tower (1); one end of the first connection pipe opening (15) is connected to the first connection pipe (6), and the other end is connected to one end of the oxidation air diffusion pipe (2) by means of a first auxiliary connection pipe (17); one end of the second connection pipe opening (16) is connected to the second connection pipe (7), and the other end is connected to the other end of the oxidation air diffusion pipe (2) by means of a second auxiliary connection pipe (18).

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