Tray device for countercurrent spray tower and countercurrent spray tower

Abstract

The present invention provides a tray device for a countercurrent spray tower and a countercurrent spray tower, wherein the tray device for the countercurrent spray tower comprises at least one porous plate, characterized in that the porous plate comprises a base and a convex portion arranged on the base and extending along the height direction of the countercurrent spray tower; a through hole is arranged on the base; the interior of the convex portion is a concave cavity, and a supporting structure matching the concave cavity for fixing the porous plate is arranged in the concave cavity. The tray device and the supporting structure have the characteristic of matching concave and convex, which can minimize the number of fastening connectors of the tray structure, reduce the processing and investment costs of the tray, and ensure the safe and stable operation of the harmful gas purification system. At the same time, a countercurrent spray tower using the tray device is provided.

Description

Technical Field

[0001] The invention belongs to the field of air pollution prevention and control, and specifically relates to a tray device for a countercurrent spray tower and a countercurrent spray tower. Background Art

[0002] With the release and implementation of the "most stringent" "Emission Standards for Air Pollutants from Thermal Power Plants" (GB13223-2011) and the requirements of the "Action Plan for Energy Conservation and Emission Reduction of Coal-fired Power Generation (2014-2020)": the emission concentration of air pollutants from newly built coal-fired power generation units basically reaches the emission limit of gas turbine units (i.e., under the condition of a baseline oxygen content of 6%, the emission concentrations of smoke, sulfur dioxide, and nitrogen oxides are not higher than 10, 35, and 50 mg / m3, respectively). In order to adapt to my country's increasingly stringent sulfur dioxide emission standards for flue gas, a number of efficiency-enhancing measures have been carried out for wet flue gas desulfurization systems.

[0003] At present, when using desulfurization equipment such as countercurrent spray tower to desulfurize flue gas, an open tray is usually installed in the countercurrent spray absorption tower. The flue gas passes through the tray opening upwards and contacts with the slurry sprayed from the spray layer. After the slurry fully contacts and reacts with the flue gas, it removes sulfur dioxide in the flue gas and then passes through the tray opening downwards and flows into the slurry pool at the bottom of the desulfurization absorption tower. At the same time, the tray can also rectify the flue gas and improve the uniformity of flue gas distribution. Since a certain thickness of liquid holding layer will be formed on the tray, the gas-liquid contact reaction time is prolonged, which can effectively improve the desulfurization efficiency. China Huadian Science and Industry Group Co., Ltd. has studied a tray structure fixing device (CN 209646213U), but the fixing device has many accessories, the number of assemblies of the entire absorption tower is large, and it is easy to loosen and fall during operation. Small parts enter the circulating pump body with the slurry, which greatly increases the risk of damaging the circulating pump and increases the operation and maintenance investment of the desulfurization system. Datang Environmental Industry Group Co., Ltd. conducted research on the shape of pallet openings (CN 206198999U), but the non-circular and irregular holes increased the difficulty of machining and the cost of the pallet. In addition, the support structure of the pallet device was not considered in the study, which affected its engineering applicability.

[0004] Therefore, in view of this situation, there is an urgent need to develop a tray device that can effectively improve the operating efficiency and stability of the countercurrent spray absorber, while ensuring the safe operation of the desulfurization system and meeting the needs of actual use. Summary of the invention

[0005] In view of the shortcomings of the existing tray device for countercurrent spray tower, the purpose of the present invention is to provide a tray device for a countercurrent spray tower and a countercurrent spray tower using the tray device, which can effectively improve the desulfurization efficiency and ensure the safe and stable operation of the desulfurization system.

[0006] In order to achieve the above object, the specific technical solution adopted by the present invention is:

[0007] A tray device for a countercurrent spray tower comprises at least one porous plate, characterized in that the porous plate comprises a base and a convex portion arranged on the base and extending in the height direction of the countercurrent spray tower; a through hole is arranged on the base; the interior of the convex portion is a concave cavity, and a supporting structure matching the concave cavity and used to fix the porous plate is arranged in the concave cavity.

[0008] The convex parts are distributed in strips on the base, and the convex part spacing is selected from 300 to 2500 mm.

[0009] The supporting structure is a rectangular steel section.

[0010] The base and the protrusion are an integrated structure.

[0011] The opening diameter of the through hole on the base is selected from 20 to 70 mm, and the diameters of the through holes are consistent.

[0012] A countercurrent spray tower, comprising: a gas inlet and at least one spray layer arranged in sequence along the flow path of harmful gas, characterized in that a tray device for a countercurrent spray tower as claimed in any one of claims 1 to 6 is arranged between the gas inlet and the spray layer and / or each spray layer. Furthermore, in the countercurrent spray tower, harmful gas is discharged from bottom to top, and in the process of the harmful gas rising, the absorbent is sprayed through the spray layer nozzle, and is discharged after contacting and reacting with the harmful gas from top to bottom.

[0013] Furthermore, the countercurrent spray tower using a tray device also includes a supporting structure arranged below the tray body along the inner wall of the countercurrent spray tower.

[0014] Furthermore, the support structure under the tray has a concave-convex matching feature with the tray structure.

[0015] Furthermore, the spacing of the support structure under the tray is selected from 300 to 2500 mm.

[0016] Through the above technical solution, harmful gases flow into the countercurrent spray tower from the inlet, pass through the tray device, spray layer, demisting layer in turn, and finally flow out from the countercurrent spray tower outlet. The harmful gas absorbent liquid in the countercurrent spray tower is sprayed out through the spray layer, flows through the tray device, falls into the collection pool, and is finally discharged. By adopting a support structure with concave and convex matching the tray structure and a tray device with a circular multi-hole structure, the countercurrent spray tower is guaranteed to operate stably after modular assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of a countercurrent spray tower in one embodiment of the present invention.

[0018] Figure 2 Schematic diagram of the three-dimensional structure of a porous plate with a single-piece width M in one embodiment of the present invention.

[0019] Figure 3 It is a schematic diagram of a partial structure of a tray device in a side view according to an embodiment of the present invention.

[0020] Figure 4 It is a schematic diagram of a partial structure of a tray device in a top view according to an embodiment of the present invention.

[0021] Explanation of the reference numerals: 1-gas inlet; 2-tray device; 21-porous plate; 211, base; 212, convex portion; 213, concave cavity; 214, through hole; 22, supporting structure; 3-spray layer; 4-demister; 5-gas outlet; 6-collecting tank. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0023] like Figure 1 In one embodiment, a countercurrent spray tower is provided, comprising: a gas inlet 1, a tray device 2, a spray layer 3, a demister 4 and a gas outlet 5 arranged in sequence along the harmful gas flow path, and a collection tank 6 is provided at the lower part of the countercurrent spray tower. The tray device 2 comprises a porous plate 21 and a support structure 22 matching the concave and convex of the tray structure, the spacing of the support structure is selected from 300 to 2500 mm, the support structure 22 is welded and fixed to the tower body, and the porous plate 21 is placed on the support structure.

[0024] The porous plate 21 includes a base 211 and a convex portion 212 arranged on the base and extending in the height direction of the countercurrent spray tower; the base 211 and the convex portion 212 can be integrally formed by bending. The interior of the convex portion is a concave cavity 213. The porous plate 21 has a plurality of circular through holes 214, and the opening diameter is selected from 20 to 70 mm;

[0025] In addition, the opening ratio of the through holes on the porous plate is selected between 0.2 and 0.5. Within this range, the slurry can be effectively kept down and the tray can be prevented from flooding.

[0026] like Figure 2 , Figure 4 As shown, the tray device is composed of a plurality of porous plates. The width M of the porous plates is selected from 200 to 2000 mm.

[0027] The material of the porous plate is alloy steel or non-metallic wear-resistant material. When the material is alloy steel, such as stainless steel, the through holes can be processed by punching or drilling. When the material is non-metallic wear-resistant material, such as glass fiber reinforced plastic composite material, the through holes can be integrally formed by molding or processed by drilling.

[0028] The countercurrent spray tower and the tray device used in the countercurrent spray tower described in the above embodiment can be used in the wet flue gas desulfurization system widely used in my country to improve its performance. The porous tray adopts a circular through-hole design, which can minimize the difficulty of tray processing and construction technology. The tray structure with concave and convex matching with the supporting structure can reduce the fastening connectors of the tray structure and ensure the safe and stable operation of the system.

[0029] like Figure 3 As shown, the supporting structure under the tray has the feature of concave and convex matching with the tray structure.

[0030] In addition, the spacing of the support structure under the pallet is selected between 300 and 2500 mm.

[0031] The supporting structure under the pallet generally uses rectangular steel as the supporting beam. If other shapes of steel are used, the pallet structure will be adjusted accordingly to ensure that the two have matching concave and convex features.

[0032] In addition, if Figure 3 As shown, the height N of the rectangular steel of the supporting structure is selected between 150 and 500 mm.

[0033] In addition, the tray device of the countercurrent spray tower is characterized by matching the concave and convex of the supporting structure, which is also reflected in that the bottom surface of the supporting structure and the opening area of ​​the tray device are maintained at the same level.

[0034] In order to ensure sufficient strength of the load-bearing area of ​​the pallet, no holes are drilled in the area where the convex area of ​​the pallet device matches the support beam.

[0035] This structural design can maintain a good slurry descending effect when a large amount of slurry flows through the tray, forming a liquid holding layer of a certain thickness for flue gas and slurry to fully contact and react. Under the dual effects of the weight of the liquid holding layer and the deadweight of the tray device, it can match the support beam and reduce the use of fasteners. For different desulfurization system designs, the height of the liquid holding layer can be adjusted by changing the height N of the support beam, which improves the applicability of the present invention.

[0036] The size of the tray openings and their arrangement on the tray can be designed according to different desulfurization systems, and the arrangement position can also be determined according to the specific structure of the countercurrent spray tower, so that the flue gas can be rectified and evenly distributed, achieving a better even distribution effect, improving the uniformity of the flue gas at the lower part of the spray layer in the countercurrent spray tower, and improving the purification effect. The invention can flexibly design the scheme according to the requirements of environmental protection technical indicators.

[0037] In summary, the countercurrent spray tower tray device provided by the present invention and the countercurrent spray tower using the tray device can improve the circulation effect of flue gas in the tray area, the tray device is easy to process, improves the uniform distribution of flue gas, reduces the number of fasteners used, and improves the working reliability of the countercurrent spray tower. The number of trays, the size of the tray openings, and the height of the liquid holding layer are designed according to the needs of the desulfurization system, which can meet the layout needs of different types of countercurrent spray towers, and improve the applicability of the present invention.

[0038] Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments in the present invention, the present invention may have various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements all fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A tray device for a countercurrent spray tower, comprising at least one porous plate, characterized in that: The porous plate includes a base and a convex portion arranged on the base and extending along the height direction of the countercurrent spray tower; a through hole is arranged on the base; the interior of the convex portion is a concave cavity, and a supporting structure matching the concave cavity is arranged in the concave cavity for fixing the porous plate; the convex portions are distributed in strips on the base, and the spacing between the convex portions is selected from 300 to 2500 mm; the porosity of the through holes on the porous plate is selected from 0.2 to 0.

5.

2. The tray device for a countercurrent spray tower according to claim 1, characterized in that: The supporting structure is a rectangular steel section.

3. The tray device for a countercurrent spray tower according to claim 1, characterized in that: The base and the protrusion are an integrated structure.

4. The tray device for a countercurrent spray tower according to claim 1, characterized in that: The opening diameter of the through hole on the base is selected from 20 to 70 mm.

5. The tray device for a countercurrent spray tower according to claim 4, characterized in that: The diameters of the through holes are consistent.

6. A countercurrent spray tower, comprising: a gas inlet and at least one spray layer arranged in sequence along the harmful gas flow path, characterized in that: A tray device for a countercurrent spray tower as claimed in any one of claims 1 to 5 is provided between the gas inlet and the spray layer and / or between each spray layer.

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