Desulfurizing tower capable of avoiding smoke return
By optimizing the drain pipeline arrangement of the desulfurization tower and adding breathable pipeline, the problem of smoke exhaust gas returning to the process chamber is solved, and the effect of effectively avoiding smoke recovery from the desulfurization tower is achieved, and environmentally friendly emission requirements are met.
Patent Information
- Application Number
- CN202422036570.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-22
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-08-22
AI Technical Summary
The existing desulfurization towers form negative pressure during the discharge process, causing the exhaust exhaust gas to flow back into the process compartment, resulting in the phenomenon of smoke returning to the desulfurization tower.
By optimizing the layout of the drain pipeline, the flow resistance of the main machine drain horizontal pipeline and the auxiliary machine drain horizontal pipeline is increased, the discharge speed of circulating water is reduced, the negative pressure formed in the pipeline is reduced, and the return of smoke exhaust gas is avoided. At the same time, the air head of the process compartment is cancelled and the breathable interface connected to the desulfurization tower is added to ensure that the exhaust exhaust gas enters the desulfurization tower for treatment.
It effectively avoids the return of smoke exhaust gas to the process compartment, reduces the occurrence of smoke return of the desulfurization tower, and meets the environmental protection requirements of TierIII's sulfur content emission.
Smart Images
Figure CN223010202U_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the field of construction and design of marine LNG storage tanks, and particularly relates to a desulfurization tower for avoiding smoke backflow. Background Art
[0002] At present, most ships have chosen to install desulfurization systems to ensure desulfurization when burning high-sulfur oil, ultimately achieving the purpose of meeting TierIII emission requirements. The most commonly used one is the hybrid desulfurization system, which includes a desulfurization tower and a process tank. The desulfurization tower is generally arranged in the chimney, and the exhaust gas enters the desulfurization tower through the exhaust pipe. In the case of a closed cycle, the circulating water in the desulfurization tower washes the exhaust gas by spraying, thereby achieving the purpose of desulfurization. The washed circulating water enters the process tank through the drain pipe below the desulfurization tower, and the exhaust gas is discharged into the atmosphere through the exhaust pipe at the top of the desulfurization tower. However, due to the large amount of sprayed water of the circulating water, during the downward discharge process of the circulating water, a large amount of circulating water discharges downward at high speed, forming a certain negative pressure in the drain pipe, which brings the exhaust gas downward into the process tank. In addition, due to the high temperature of the exhaust gas and the spraying of the circulating water, some steam is generated, resulting in a certain positive pressure in the desulfurization tower, about 800 Pa. In the process tank, since there is an air head installed on the process tank and it is connected to the atmosphere, it can be regarded as an open tank and there is no pressure in the tank, which will also cause the exhaust gas to flow downward into the process tank through the drain pipe. When the exhaust gas enters the process tank, it will be discharged through the air head installed on the process tank, causing a large amount of exhaust gas to accumulate near the air head, resulting in the phenomenon of smoke backflow in the desulfurization tower. Therefore, an effective technical solution is needed to solve this problem. Summary of the Invention
[0003] To solve the above problems, the present invention provides a desulfurization tower for avoiding smoke backflow, aiming to achieve the purpose of avoiding smoke backflow in the desulfurization tower. The technical solution adopted is as follows:
[0004] A desulfurization tower for avoiding smoke backflow includes a main desulfurization tower and an auxiliary desulfurization tower. The main desulfurization tower is provided with a vertically arranged main drain pipe, and the auxiliary desulfurization tower is provided with a vertically arranged auxiliary drain pipe. A main drain horizontal pipe and an auxiliary drain horizontal pipe are respectively added in the middle of the main drain pipe and the auxiliary drain pipe. Both the main drain horizontal pipe and the auxiliary drain horizontal pipe are horizontally arranged.
[0005] The discharge ports of the main engine discharge pipeline and the auxiliary engine discharge pipeline are connected into the process cabin. A breather pipe extends from the top of the process cabin and is connected to the breather interface of the auxiliary engine desulfurization tower. When the breather interface enters the auxiliary engine desulfurization tower, it is in an inclined state from top to bottom. The exhaust gas in the process cabin enters the auxiliary desulfurization tower through the breather pipe. When the pressure in the process cabin reaches 800 Pa, the main engine desulfurization tower, the auxiliary engine desulfurization tower, and the process cabin reach pressure balance. At this time, the exhaust gas in the process cabin no longer enters the auxiliary desulfurization tower.
[0006] For the above desulfurization tower for avoiding backflow of smoke, further, the process cabin is located below the main engine desulfurization tower and the auxiliary engine desulfurization tower.
[0007] For the above desulfurization tower for avoiding backflow of smoke, further, the breather pipe is made of fiberglass GRE or duplex stainless steel SS2205.
[0008] For the above desulfurization tower for avoiding backflow of smoke, further, spray devices are provided in the main engine desulfurization tower and the auxiliary engine desulfurization tower.
[0009] For the above desulfurization tower for avoiding backflow of smoke, further, a high-level alarm device is provided below the breather interface.
[0010] By optimizing the layout of the discharge pipeline, the present invention increases the flow resistance of the main engine discharge horizontal pipeline and the auxiliary engine discharge horizontal pipeline, reduces the discharge speed of the circulating water, can reduce the negative pressure formed in the pipeline to a certain extent, and avoids the backflow of exhaust gas into the process cabin, especially for ships with double desulfurization. In order to prevent the exhaust gas from being discharged through the air head of the process cabin, it is necessary to cancel the air head of the process cabin and add a breather pipe to the process cabin. The end of the pipe is connected to the desulfurization tower, and the desulfurization tower is used for ventilation. Thus, the excessive flue gas will only enter the desulfurization tower and will not be discharged through the air head. For ships that have been delivered or have been found to have this problem during construction, the present invention is the simplest and most reliable solution without the need to add complex valves and logic controls, nor the need to accurately calculate the flow resistance of the discharge pipeline. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 is a schematic structural diagram of the present invention;
[0012] Figure 2 is a schematic diagram when the main engine desulfurization tower, the auxiliary engine desulfurization tower and the process cabin reach pressure balance;
[0013] Among them, 1 - main engine desulfurization tower, 2 - auxiliary engine desulfurization tower, 3 - process cabin, 4 - main engine discharge pipeline, 5 - auxiliary engine discharge pipeline, 6 - breather pipe, 7 - breather interface, 8 - main engine discharge horizontal pipeline, 9 - auxiliary engine discharge horizontal pipeline. DETAILED DESCRIPTION OF THE INVENTION
[0014] The present invention will be further described in conjunction with the accompanying drawings.
[0015] like Figure 1 A desulfurization tower for avoiding smoke return is shown, the main engine desulfurization tower and the auxiliary engine desulfurization tower are located above the process cabin, the main engine desulfurization tower has a vertically arranged main engine discharge pipeline, the auxiliary engine desulfurization tower has a vertically arranged auxiliary engine discharge pipeline, and a main engine discharge horizontal pipeline and an auxiliary engine discharge horizontal pipeline are respectively added between the main engine discharge pipeline and the auxiliary engine discharge pipeline, and the main engine discharge horizontal pipeline and the auxiliary engine discharge horizontal pipeline are both arranged horizontally. The main purpose is to increase the flow resistance of the circulating water discharge pipeline, reduce the discharge speed of the circulating water to a certain extent, and avoid the formation of negative pressure in the discharge pipeline due to excessive discharge speed, which drives the exhaust gas into the process cabin 3.
[0016] The air head on the process chamber 3 is cancelled, and instead a ventilation pipe 6 is added to the process chamber. The ventilation pipe is connected to the ventilation interface 7 of the auxiliary desulfurization tower to ensure the ventilation of the process chamber and avoid the exhaust gas in the process chamber 7 from accumulating for a long time and being unable to be discharged. This part of the exhaust gas enters the desulfurization tower and is discharged into the atmosphere through spraying treatment to meet the Tier III sulfur content emission environmental protection requirements.
[0017] The auxiliary desulfurization tower ventilation interface 7 is tilted from top to bottom when entering the desulfurization tower to prevent the spray of the auxiliary desulfurization tower 2 from entering the auxiliary desulfurization tower ventilation interface 7 and affecting the ventilation of the process cabin 3.
[0018] The auxiliary desulfurization tower 2 needs to add a high-level alarm device 8, the height of which should be lower than the auxiliary desulfurization tower ventilation interface 7. Its main function is to prevent the circulating water in the auxiliary desulfurization tower circulating water discharge pipeline 5 from being discharged smoothly, resulting in the accumulation of circulating water and entering the process cabin ventilation pipeline.
[0019] In addition, for the design of this double desulfurization tower (main engine desulfurization tower 1 and auxiliary engine desulfurization tower 2), when adding the process cabin ventilation pipeline 6, only one ventilation pipeline needs to be added, because when the main engine is running, the auxiliary engine must be running, so when the main engine desulfurization tower is working, the auxiliary engine desulfurization tower must work; while when the auxiliary engine is running, the main engine may not work, so when the auxiliary engine desulfurization tower is working, the main engine desulfurization tower may not work. Therefore, it is necessary to connect the process cabin ventilation pipeline 6 to the auxiliary engine desulfurization tower to ensure that at any time, the exhaust gas entering the desulfurization tower through the process cabin ventilation pipeline 6 can be desulfurized by the working desulfurization tower before being discharged into the atmosphere.
[0020] In addition, since the main engine desulfurization tower 1 and the auxiliary engine desulfurization tower 2 are completely connected with the process chamber 3, the pressure of the process chamber will also increase. When it reaches 800 Pa, the main engine desulfurization tower 1 and the auxiliary engine desulfurization tower 2 reach pressure balance with the process chamber 3. At this time, no exhaust gas will enter the process chamber 6. Figure 2 shown.
[0021] Regarding the material requirements for the vent pipe of the process module, since the vent pipe contacts the exhaust gas with a certain amount of seawater and has a certain corrosiveness, in order to ensure the safety of the entire system and the main and auxiliary equipment, it is necessary to use fiberglass reinforced plastic GRE material or duplex stainless steel SS2205 material. Using fiberglass reinforced plastic GRE material is more economical and easier to construct.
Claims
1. A desulfurization tower for avoiding smoke return, characterized in that: A main engine desulfurization tower (1) and an auxiliary engine desulfurization tower (2) are provided. The main engine desulfurization tower is provided with a vertically arranged main engine discharge pipeline (4), and the auxiliary engine desulfurization tower is provided with a vertically arranged auxiliary engine discharge pipeline (5). A main engine discharge horizontal pipeline (8) and an auxiliary engine discharge horizontal pipeline (9) are respectively provided between the main engine discharge pipeline and the auxiliary engine discharge pipeline. The main engine discharge horizontal pipeline and the auxiliary engine discharge horizontal pipeline are both provided horizontally. The discharge port of the main engine discharge pipeline and the discharge port of the auxiliary engine discharge pipeline are connected to the process cabin (3). A ventilation pipeline (6) extends from the top of the process cabin and is connected to the ventilation interface of the auxiliary engine desulfurization tower. When the ventilation interface (7) enters the auxiliary engine desulfurization tower, it is in a tilted state from top to bottom. The exhaust gas in the process cabin enters the auxiliary desulfurization tower through the ventilation pipeline. When the pressure in the process cabin reaches 800pa, the main engine desulfurization tower, the auxiliary engine desulfurization tower and the process cabin reach pressure balance. At this time, the exhaust gas in the process cabin no longer enters the auxiliary desulfurization tower.
2. A desulfurization tower for avoiding smoke return according to claim 1, characterized in that: The process chamber is located below the main engine desulfurization tower and the auxiliary engine desulfurization tower.
3. A desulfurization tower for avoiding smoke backflow according to claim 1, characterized in that: The ventilation pipeline is made of glass fiber reinforced plastic GRE or duplex stainless steel SS2205.
4. A desulfurization tower for avoiding smoke return according to claim 1, characterized in that: Spraying devices are installed in the main engine desulfurization tower and the auxiliary engine desulfurization tower.
5. A desulfurization tower for avoiding smoke backflow according to claim 1, characterized in that: A high-level alarm device is arranged below the ventilation interface.