Circulating fluidized bed semi-dry desulfurization tower outlet rectifying device

Abstract

The utility model relates to the technical field of flue gas desulfurization, in particular to an outlet rectifying device of a semi-dry desulfurization tower of a circulating fluidized bed, which comprises a volute, a rectifying partition plate and an outlet flue, and through the synergistic effect of a spiral curve of the volute and the rectifying partition plate, the distribution of a flue gas flow field is optimized, and the problems of flue gas eccentricity and non-uniform flow velocity are solved. The outlet flue adopts a divergent design and is matched with a reinforcing rib and flow guide cone structure, so that the desulfurization efficiency is remarkably improved, the system resistance is reduced, and the device is convenient to mount and maintain due to a modular design and has high engineering application value.

Description

Technical Field

[0001] This utility model relates to the field of flue gas desulfurization technology, specifically a circulating fluidized bed semi-dry desulfurization tower outlet rectifier device. Background Technology

[0002] Circulating fluidized bed (CFB) semi-dry desulfurization is an environmentally friendly new technology widely used in flue gas desulfurization in thermal power plants. This technology utilizes dry slaked lime powder (Ca(OH)2) as the absorbent, increasing the contact time between the absorbent and the flue gas through multiple recirculations, thereby improving the absorbent utilization rate and ultimately achieving efficient desulfurization. The core of CFB semi-dry desulfurization technology lies in the circulating fluidized bed reactor. Flue gas enters the reactor from the bottom of the circulating fluidized bed, while dry Ca(OH)2 is fed into the reaction tower via the desulfurizing agent supply system. The fluidized material and acidic gases such as sulfur dioxide in the flue gas undergo a chemical reaction in the reaction tower, removing most of the sulfur dioxide and other pollutants from the flue gas. The reaction products are treated in a dry state, avoiding the generation of wastewater and waste liquid.

[0003] In existing technologies, the outlet section of the desulfurization tower adopts a right-angle bend structure, which leads to eccentric flue gas flow and uneven flow velocity, causing the following problems:

[0004] Turbulent flue gas flow field leads to shortened reaction time and decreased desulfurization efficiency;

[0005] Increased scaling on the tower walls leads to higher system operating resistance;

[0006] Uneven material fluidization poses a risk of bed collapse.

[0007] Therefore, this technology designs an outlet rectifier for a circulating fluidized bed semi-dry desulfurization tower. Utility Model Content

[0008] The purpose of this invention is to provide a circulating fluidized bed semi-dry desulfurization tower outlet rectifier to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, this utility model provides the following technical solution:

[0010] A circulating fluidized bed semi-dry desulfurization tower outlet rectification device includes a volute, rectification baffles, and an outlet flue. The volute is fixedly installed at the desulfurization tower outlet, and its inner wall adopts a progressive spiral curve design. Multiple rectification baffles are provided and distributed along the axial direction of the volute and extend to the outlet flue. The outlet flue is connected to the end of the volute, and its cross-section is set as a gradually expanding structure. The gradually expanding cross-section reduces the flue gas velocity from the volute, prolongs the contact time between the flue gas and the desulfurizing agent, and reduces pressure loss. That is, by increasing the cross-sectional area, local eddies are reduced, and the system resistance is reduced by 10%-15%. Multiple sets of reserved test holes are opened on the side wall of the volute for inserting testing equipment.

[0011] Compared with the prior art, the beneficial effects of this utility model are: the flue gas is guided to diffuse evenly by the spiral curve of the volute, the flue gas flow field is divided by the rectifier baffle to eliminate eccentricity, and the flow velocity is reduced by the gradually expanding outlet flue to extend the reaction time, thereby ensuring improved desulfurization efficiency and reduced system resistance. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of an outlet rectifier device for a circulating fluidized bed semi-dry desulfurization tower.

[0013] The components include: volute 1, rectifier baffle 2, outlet flue 3, reserved test hole 4, reinforcing rib 5, and maintenance manhole 6. Detailed Implementation

[0014] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0015] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0016] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0017] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0018] Please see Figure 1A circulating fluidized bed semi-dry desulfurization tower outlet rectification device includes a volute 1, rectification baffles 2, and an outlet flue 3. The volute 1 is fixedly installed at the outlet of the desulfurization tower, and its inner wall adopts a progressive spiral curve design. The rectification baffles 2 are provided with multiple pieces and are distributed along the axial direction of the volute 1 and extend to the outlet flue 3. The outlet flue 3 is connected to the end of the volute 1, and its cross-section is set as a gradually expanding structure. The gradually expanding cross-section reduces the flue gas velocity from the volute 1, prolongs the contact time between the flue gas and the desulfurizing agent, and reduces pressure loss. That is, by increasing the cross-sectional area, local eddies are reduced, and the system resistance is reduced by 10%-15%. Multiple sets of reserved test holes 4 are opened on the side wall of the volute 1 for inserting testing equipment.

[0019] In this embodiment of the invention, the volute 1 and the desulfurization tower outlet can be connected by means of flange bolts, welding, or modular snap-fit ​​structure, etc.

[0020] Specifically, the flange bolt connection is as follows: a matching flange is designed between the volute 1 and the outlet end of the desulfurization tower, which is fixed by high-strength bolts and sealed with high-temperature resistant gaskets.

[0021] Welding and fixing: The volute 1 is directly welded to the outlet of the desulfurization tower. The inner and outer walls of the weld are ground smooth to avoid flue gas turbulence.

[0022] Modular snap-fit ​​structure: The edge of the volute 1 is designed as a flange slot, which matches the groove at the outlet of the desulfurization tower and is pressed and fixed by a hydraulic clamp;

[0023] Multiple reinforcing ribs 5 are evenly installed on the outer wall of the volute 1 along its trajectory direction to increase the overall strength of the volute 1.

[0024] The number of rectifier baffles 2 is set to 4-8 pieces, which are distributed at an angle of 15°-30° with the center line of the volute 1. At the same time, the divergence angle of the outlet flue 3 is 5°-10°, and the length to the diameter of the volute 1 is 1.2-1.5:1.

[0025] The reserved test hole 4 is fitted with a corrosion-resistant bushing with a hole diameter of 50-100mm; the testing equipment inserted into the reserved test hole 4 includes flow field testing equipment, composition analysis equipment, and structural monitoring equipment.

[0026] Among them, the flow field detection equipment includes a thermal anemometer: measuring the velocity distribution of flue gas with an accuracy of ±0.1m / s.

[0027] Differential pressure sensor: monitors the pressure difference inside and outside the volute to determine the uniformity of the flow field.

[0028] The component analysis equipment includes: a laser gas analyzer: which detects SO2 and O2 concentrations in real time, with a sampling probe inserted into the orifice;

[0029] Particulate matter concentration meter: It uses the principle of light scattering to measure the amount of unreacted Ca(OH)2 that escapes.

[0030] The structural monitoring equipment includes an industrial endoscope: used to inspect the internal wear or scaling of the volute 1.

[0031] A maintenance manhole 6 is provided on one side of the top of the volute 1. The maintenance manhole 6 is equipped with a sealing cover plate to control the opening and closing of the maintenance manhole 6. The maintenance manhole 6 is equipped with a quick-opening flange and has a safety guardrail inside.

[0032] The sealing cover is connected to the maintenance manhole 6 by a quick-opening flange and is equipped with a rubber sealing ring;

[0033] The safety guardrail is made of foldable stainless steel grid and is fixed to the inner wall of the maintenance manhole 6 by buckles. It is used to prevent maintenance personnel from accidentally falling into the volute 1. The guardrail has a load-bearing capacity of ≥200kg and meets the GB 4053.3-2009 protection standard.

[0034] The width of the reinforcing rib 5 is 2-3 times the thickness of the volute 1, ensuring that the volute 1 can provide stable impact protection and other functions.

[0035] In one embodiment of the present invention, the substrate of the rectifier baffle 2 is made of 316L stainless steel with a thickness of 4-6mm;

[0036] Surface treatment: Plasma spraying of Al2O3 coating (thickness 50-100μm) to improve wear resistance.

[0037] The reinforcing rib 5 is made of Q345B low alloy steel and is treated with anti-corrosion processes such as hot-dip galvanizing (zinc layer ≥80μm) or epoxy coal tar coating.

[0038] The process of using this utility model is as follows: weld and fix the volute 1 to the desulfurization tower;

[0039] Weld annular reinforcing ribs 5 to the outer wall of the volute 1;

[0040] Install rectifier baffle 2 at an angle of 20° to form 6 flow distribution channels;

[0041] A test hole 4 is prepared on the side wall of the volute 1;

[0042] The outlet flue 3 is designed with a gradually expanding angle of 8° and a length 1.3 times the diameter of the volute 1;

[0043] During commissioning, an anemometer was inserted through the reserved test hole 4 to verify the uniformity of the flow field.

[0044] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A circulating fluidized bed semi-dry desulfurization tower outlet rectifying device, characterized in that, It includes a volute (1), a rectifier baffle (2), an outlet flue (3), a reserved test hole (4), a reinforcing rib (5), and a maintenance manhole (6); the volute (1) is fixed at the outlet of the desulfurization tower, and its inner wall has a spiral curve structure. The rectifier baffle (2) is distributed along the axial direction of the volute. The outlet flue (3) is connected to the end of the volute and is gradually expanding. The reserved test hole (4) is located on the side wall of the volute. The reinforcing rib (5) is welded to the outer wall of the volute. The maintenance manhole (6) is located at the top of the volute.

2. The circulating fluidized bed semi-dry desulfurization tower outlet rectifier according to claim 1, characterized in that, The reinforcing rib (5) is welded to the outer wall of the volute (1).

3. The circulating fluidized bed semi-dry desulfurization tower outlet rectifying device according to claim 1, characterized in that, The number of the rectifier baffles (2) is 4-8 pieces, and the angle between them and the center line of the volute is 15°-30°.

4. The circulating fluidized bed semi-dry desulfurization tower outlet rectifying device according to claim 1, characterized in that, The expansion angle of the outlet flue (3) is 5°-10°, and the length-to-volute diameter ratio is 1.2-1.5:

1.

5. The circulating fluidized bed semi-dry desulfurization tower outlet rectifying device according to claim 1, characterized in that, The reserved test hole (4) is fitted with a corrosion-resistant bushing.

6. The circulating fluidized bed semi-dry desulfurization tower outlet rectifying device according to claim 1, characterized in that, The width of the reinforcing rib (5) is 2-3 times the thickness of the volute wall.

7. The circulating fluidized bed semi-dry desulfurization tower outlet rectifying device according to claim 1, characterized in that, The maintenance manhole (6) is equipped with a quick-opening flange and an internal safety railing.

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