Semi-dry desulfurization island flue gas recirculation pipeline

Abstract

The utility model discloses a semi-dry desulfurization island flue gas recirculation pipeline which comprises a pipeline body, a first inlet pipeline and a second inlet pipeline, and the two ends of the pipeline body are communicated with the first inlet pipeline and the second inlet pipeline respectively. A filtering mechanism is arranged in the first inlet pipeline between the joint of the pipeline body and the first inlet pipeline and the inlet steering pipeline, the filtering mechanism comprises a conical filter cartridge, and a filtering assembly is arranged in the conical filter cartridge. According to the utility model, large-particle solids, small-particle unreacted substances, heavy metal particles, organic pollutants, peculiar smell substances and the like in flue gas can be more comprehensively and effectively removed through a plurality of layers of filter screens in the filter assembly, so that the purification quality of the flue gas is greatly improved; the flow velocity reduction caused by pressure loss in the filtering process can be reduced as much as possible, the hydrodynamic performance of the whole flue system is improved, and the normal conveying and desulfurization effects of flue gas are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of semi-dry desulfurization devices, in particular to a semi-dry desulfurization island flue gas recirculation pipeline. Background Art

[0002] After limestone desulfurization is discontinued in a circulating fluidized bed boiler, the tail flue gas passes through a semi-dry desulfurization unit using slaked lime in an operating environment of 90°C, bringing it into compliance with flue gas emission standards. The desulfurization effect is excellent during normal operation. In a semi-dry desulfurization unit, the flue gas recirculation duct is a key component. Traditional flue gas recirculation ducts primarily focus on transporting flue gas from one area to another.

[0003] Currently, the existing flue gas recirculation duct filtration system often adopts a relatively simple filtration method, which simply sets one or two layers of filter mesh. The filtering effect for pollutants of different particle sizes and types is poor. Although some have multiple layers of filter mesh, they do not take into account the pressure loss during the filtration process, resulting in a decrease in the flue gas flow rate, resulting in poor fluid dynamics performance of the entire flue system, affecting the normal transportation of flue gas and desulfurization effect.

[0004] Based on this, we designed a semi-dry flue gas recirculation pipeline for the desulfurization island. Utility Model Content

[0005] The purpose of the utility model is to overcome the above problems or at least partially solve the above problems, and to propose a semi-dry flue gas recirculation pipeline for desulfurization island.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical solution: a semi-dry flue gas recirculation pipeline for a desulfurization island, comprising a pipeline body, an inlet pipeline 1 and an inlet pipeline 2, wherein the two ends of the pipeline body are respectively connected to the inlet pipeline 1 and the inlet pipeline 2, a flue gas conditioning device is provided in the pipeline body near the inlet pipeline, and an inlet diversion pipeline and a desulfurization tower body connected to the inlet diversion pipeline are provided at one end of the inlet pipeline 1;

[0007] A filtering mechanism is provided in the inlet pipe 1 between the connection between the pipe body and the inlet pipe 1 and the inlet turning pipe. The filtering mechanism includes a conical filter cartridge, and a filter assembly is provided in the conical filter cartridge.

[0008] In a preferred embodiment, the outer wall of the pipeline body is provided with pipeline supports and guide supports along the way.

[0009] In a preferred embodiment, the smoke regulating device is an electric flap valve.

[0010] In a preferred embodiment, a gate valve is provided at one end of the inlet pipe away from the inlet diverting pipe.

[0011] In a preferred embodiment, the conical filter cartridge includes a connecting cylinder arranged on the inner side thereof and a supporting ring arranged on the outer side thereof, and the supporting ring is connected to the inner wall of the inlet pipe.

[0012] In a preferred embodiment, the filter assembly includes a primary filter, a medium efficiency filter, a high efficiency filter and an activated carbon filter, and the primary filter, medium efficiency filter, high efficiency filter and activated carbon filter are arranged in the inner cavity of the conical filter cartridge from the outside to the inside.

[0013] In a preferred embodiment, there are two conical filter cartridges, which are connected to each other through a connecting tube. The outer wall of the connecting tube is provided with a thread, and the outer wall of the connecting tube is screwed with an internal threaded tube through the thread. The internal threaded tube connects the connecting tubes on the inner sides of the two conical filter cartridges. The inner cavity of the conical filter cartridge close to the side of the inlet steering pipe is provided with a high-efficiency filter screen and an activated carbon filter screen from the inside to the outside.

[0014] In a preferred embodiment, a mounting hole is formed on the outer wall of the support ring.

[0015] In a preferred embodiment, the diameter of the pipe body is 2700 mm.

[0016] Compared with the existing technology, the utility model provides a semi-dry desulfurization island flue gas recirculation duct. Through the multi-layer filter mesh in the filter assembly, it can more comprehensively and effectively remove large particles of solids, small particles of unreacted substances, heavy metal particles, organic pollutants and odor substances in the flue gas, greatly improving the purification quality of the flue gas. At the same time, combined with the design of the conical filter cartridge, it can minimize the pressure loss in the filtration process and cause the flow rate to decrease, improve the fluid dynamics performance of the entire flue system, and ensure the normal transportation of flue gas and the desulfurization effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the planar structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the three-dimensional structure of the filter assembly in the present invention;

[0019] Figure 3 It is a schematic diagram of the three-dimensional cross-sectional structure of the filtering mechanism in the present invention.

[0020] In the figure: 1. Pipeline body; 2. Inlet pipe 1; 3. Inlet pipe 2; 4. Pipeline support along the way; 5. Guide support; 6. Flue gas adjustment device; 7. Gate valve; 8. Filter mechanism; 81. Conical filter cartridge; 82. Connecting cylinder; 83. Support ring; 84. Mounting hole; 85. Internal threaded cylinder; 86. Primary filter; 87. Medium-efficiency filter; 88. High-efficiency filter; 89. Activated carbon filter; 9. Inlet steering pipe; 10. Desulfurization tower body. DETAILED DESCRIPTION

[0021] The present invention will be described in further detail below with reference to the accompanying drawings.

[0022] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this description, those skilled in the art may make creative modifications to the embodiment as needed, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.

[0023] The utility model discloses a semi-dry flue gas recirculation pipeline for desulfurization island, which solves the technical problems in the existing technology. The overall idea is as follows:

[0024] Example 1:

[0025] See Figure 1 、 Figure 2 、 Figure 3 A semi-dry flue gas recirculation pipeline for a desulfurization island includes a pipeline body 1, an inlet pipeline 1 2, and an inlet pipeline 2 3. The two ends of the pipeline body 1 are respectively connected to the inlet pipeline 1 2 and the inlet pipeline 2 3. A flue gas conditioning device 6 is provided in the pipeline body 1 near the inlet pipeline 1 2. An inlet diversion pipeline 9 and a desulfurization tower body 10 connected to the inlet diversion pipeline 9 are provided at one end of the inlet pipeline 1 2.

[0026] A filter mechanism 8 is provided in the inlet pipe 1-2 between the connection between the pipe body 1 and the inlet pipe 1-2 and the inlet turning pipe 9. The filter mechanism 8 includes a conical filter cartridge 81, and a filter assembly is provided in the conical filter cartridge 81.

[0027] With such an arrangement, when passing through the conical filter cartridge 81, the internal flue of the conical filter cartridge 81 gradually contracts, causing the flue gas to accelerate through the filter assembly. When discharged, the flue gas decelerates as the flue expands, reducing the pressure loss caused by the filter assembly and the resulting decrease in flow rate, thereby improving the fluid dynamics performance of the entire flue system.

[0028] In a specific implementation, the outer wall of the pipeline body 1 is provided with pipeline supports 4 and guide supports 5 along the way.

[0029] In a specific implementation, the smoke regulating device 6 is an electric flap valve.

[0030] In specific implementation, a gate valve 7 is provided at one end of the inlet pipe 2 away from the inlet turning pipe 9.

[0031] In a specific implementation, the conical filter cartridge 81 includes a connecting cylinder 82 disposed on its inner side and a support ring 83 disposed on its outer side. The support ring 83 is connected to the inner wall of the inlet pipe 2.

[0032] Such an arrangement can facilitate the connection between the two conical filter cartridges 81 and support them in the inlet pipe 2.

[0033] In a specific implementation, the filter assembly includes a primary filter 86, a medium-efficiency filter 87, a high-efficiency filter 88, and an activated carbon filter 89. The primary filter 86, the medium-efficiency filter 87, the high-efficiency filter 88, and the activated carbon filter 89 are sequentially arranged in the inner cavity of the conical filter cartridge 81 from the outside to the inside.

[0034] In this configuration, the primary filter is used to intercept larger solid particles 86, the medium filter 87 is used to filter smaller unreacted material particles or smaller dust particles remaining after the primary filtration, the high-efficiency filter 88 is used to filter some heavy metal particles, extremely fine dust or possible catalyst particles, and the activated carbon filter 89 is used to adsorb organic compounds, odorous substances, etc. in the flue gas.

[0035] In a specific implementation, there are two conical filter cartridges 81, which are connected to each other through a connecting cylinder 82. The outer wall of the connecting cylinder 82 is provided with a thread, and the outer wall of the connecting cylinder 82 is screwed with an internal threaded cylinder 85. The internal threaded cylinder 85 connects the connecting cylinders 82 on the inner sides of the two conical filter cartridges 81. The inner cavity of the conical filter cartridge 81 near the side of the inlet steering pipe 9 is provided with a high-efficiency filter screen 88 and an activated carbon filter screen 89 from the inside to the outside.

[0036] With this arrangement, the connection between the connecting cylinder 82 and the internally threaded cylinder 85 facilitates the assembly and disassembly of the two conical filter cartridges 81. The arrangement of the two conical filter cartridges 81 can improve the filtering effect. Since pressure loss occurs when the filter assembly in the second conical filter cartridge 81 is passed through, only the high-efficiency filter screen 88 and the activated carbon filter screen 89 are provided in the second conical filter cartridge 81, thereby improving the filtering effect while minimizing pressure loss.

[0037] Of course, when the high-efficiency filter 88 and the activated carbon filter 89 in the second conical filter cartridge 81 are specifically set, they can also be set as close to the connecting tube 82 as possible to reduce the cross-sectional area of ​​the high-efficiency filter 88 and the activated carbon filter 89. At the same time, it can also ensure that the flue gas can be directly filtered without undergoing expansion flow. In this way, after the flue gas accelerates out of the first conical filter cartridge 81 and enters the second conical filter cartridge 81, it is immediately filtered through the high-efficiency filter 88 and the activated carbon filter 89, and the obstruction to the flue gas is relatively small.

[0038] In a specific implementation, a mounting hole 84 is opened on the outer wall of the support ring 83 for connecting and fixing with the inlet pipe 2 through bolts.

[0039] During specific implementation, the diameter of the pipeline body 1 is 2700mm. Since the original diameter of the flue gas recirculation pipeline is 1800m, during the boiler startup, the desulfurization device is in full operation under the premise that the flue gas regulating device of the flue gas recirculation pipeline is fully open, and the total amount of flue gas is low, which makes it impossible to build a bed on the desulfurization island during the boiler startup, and there is a risk of exceeding the sulfur dioxide emission index at the exhaust port. Therefore, the diameter of the recirculation flue is expanded to 2700mm to ensure that the flue gas volume of the desulfurization device meets the desulfurization requirements when the boiler is started. The desulfurization device and the boiler are started simultaneously to ensure that the sulfur dioxide emission requirements meet the requirements during the boiler startup.

[0040] The above description of the embodiments is to facilitate ordinary technicians in this technical field to understand and use the present invention. It is obvious that those familiar with the technology in this field can easily make various modifications to the embodiments and apply the general principles described herein to other embodiments without having to engage in creative work. Therefore, the present invention is not limited to the above embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A flue gas recirculation pipeline for a semi-dry desulfurization island, characterized by: The invention comprises a pipeline body (1), an inlet pipeline 1 (2) and an inlet pipeline 2 (3), wherein both ends of the pipeline body (1) are respectively connected to the inlet pipeline 1 (2) and the inlet pipeline 2 (3), a flue gas regulating device (6) is provided in the pipeline body (1) near the inlet pipeline 1 (2), and an inlet turning pipeline (9) and a desulfurization tower body (10) connected to the inlet turning pipeline (9) are provided at one end of the inlet pipeline 1 (2); A filter mechanism (8) is provided in the inlet pipe (2) between the connection between the pipe body (1) and the inlet pipe (2) and the inlet turning pipe (9), and the filter mechanism (8) includes a conical filter cartridge (81), and a filter assembly is provided in the conical filter cartridge (81).

2. The flue gas recirculation pipeline of a semi-dry desulfurization island according to claim 1 is characterized in that: The outer wall of the pipeline body (1) is provided with pipeline supports (4) and guide supports (5) along the way.

3. The flue gas recirculation pipeline of a semi-dry desulfurization island according to claim 2 is characterized in that: The smoke regulating device (6) is an electric flap valve.

4. A flue gas recirculation pipeline for a semi-dry desulfurization island according to claim 3, characterized in that: A gate valve (7) is provided at one end of the inlet pipe (2) away from the inlet diverting pipe (9).

5. The flue gas recirculation pipeline of a semi-dry desulfurization island according to claim 4 is characterized in that: The conical filter cartridge (81) includes a connecting cylinder (82) arranged on one side thereof and a supporting ring (83) arranged on the other side thereof, wherein the supporting ring (83) is connected to the inner wall of the inlet pipe (2).

6. The flue gas recirculation pipeline of a semi-dry desulfurization island according to claim 5 is characterized in that: The filter assembly comprises a primary filter (86), a medium-efficiency filter (87), a high-efficiency filter (88) and an activated carbon filter (89), wherein the primary filter (86), the medium-efficiency filter (87), the high-efficiency filter (88) and the activated carbon filter (89) are sequentially arranged in the inner cavity of the conical filter cartridge (81) from the outside to the inside.

7. The flue gas recirculation pipeline of a semi-dry desulfurization island according to claim 6 is characterized in that: There are two conical filter cartridges (81) and they are connected to each other via a connecting cylinder (82). The outer wall of the connecting cylinder (82) is provided with a thread. The outer wall of the connecting cylinder (82) is screwed with an internal threaded cylinder (85). The internal threaded cylinder (85) connects the connecting cylinders (82) on the inner sides of the two conical filter cartridges (81). The inner cavity of the conical filter cartridge (81) near the side of the inlet steering pipe (9) is provided with a high-efficiency filter screen (88) and an activated carbon filter screen (89) in sequence from the inside to the outside.

8. The flue gas recirculation pipeline of a semi-dry desulfurization island according to claim 7 is characterized in that: The outer wall of the support ring (83) is provided with a mounting hole (84).

9. A flue gas recirculation pipeline for a semi-dry desulfurization island according to any one of claims 1 to 8, characterized in that: The diameter of the pipe body (1) is 2700 mm.

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