A direct stack modular flue gas cooling device

Abstract

The utility model belongs to the field of alkali recovery boiler flue gas cooler, disclose a kind of directly stacked modular flue gas cooling device, including at least two upper and lower arrangement smoke cooling module, two smoke cooling modules between upper and lower adjacent are connected by the way of directly stacking;Wherein, the bottom of upper smoke cooling module is sealingly connected with the top of lower smoke cooling module, and make the flue gas passage formed by upper and lower smoke cooling module mutually align and through.The smoke cooling module includes the frame section steel of supporting effect, the bottom of frame section steel located in upper smoke cooling module is sealingly welded and fixed with the top of frame section steel located in lower smoke cooling module, and sealingly welded with sealing guard plate on the outer surface of the frame section steel.The utility model cancels the connecting flue between module, and flue gas flow field is more smooth, significantly reduces system resistance.

Description

Technical Field

[0001] This utility model relates to the field of boiler tail flue gas treatment technology, specifically to a direct stacked modular flue gas cooling device for reducing exhaust gas temperature and recovering waste heat. Background Technology

[0002] In boilers, especially alkali recovery furnaces or various industrial boilers, flue gas coolers (referred to as "flue gas coolers") are often installed in the tail flue to reduce the exhaust gas temperature, recover heat, and create conditions for efficient operation of subsequent environmental protection equipment such as electrostatic precipitators. Traditional multi-layer flue gas cooler modules typically adopt a split design, with each layer connected by a transition flue. This structure has the following drawbacks: ① High system resistance: The transition flue increases the flow resistance and turbulence of flue gas, resulting in increased power consumption of the induced draft fan.

[0003] ② Poor sealing: The supporting steel structure passes through the flue, and the difference in thermal expansion between the steel structure and the flue makes it impossible to directly weld a seal, which easily leads to air leakage.

[0004] ③ Complex structure and large space occupation: The transition flue itself requires additional installation space and has a complex supporting structure, which is not conducive to space-constrained renovation projects.

[0005] ④ High cost and long cycle: It requires the design and installation of additional connecting flues and supporting steel structures, which increases material, design and construction costs and extends the project period. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a direct stacking modular flue gas cooling device with a compact structure, good sealing performance, low resistance and convenient installation. Since the connecting flue between modules is eliminated, the flue gas flow field is smoother and the system resistance is significantly reduced.

[0007] To achieve the above objectives, the technical solution of this utility model is as follows: a directly stacked modular flue gas cooling device, comprising at least two flue gas cooling modules arranged vertically, wherein two adjacent flue gas cooling modules are connected by direct stacking; wherein the bottom of the upper flue gas cooling module is sealed to the top of the lower flue gas cooling module, and the flue gas channels formed by the upper and lower flue gas cooling modules are aligned and interconnected.

[0008] Optionally, the smoke cooling module includes a supporting frame steel, the bottom of the frame steel of the upper smoke cooling module is sealed and welded to the top of the frame steel of the lower smoke cooling module, and a sealing plate is sealed and welded to the outer surface of the frame steel to form a fully sealed welded box structure.

[0009] Preferably, it includes two flue gas cooling modules arranged vertically. The flue gas cooling modules are provided with a water-side inlet header and a water-side outlet header on their outer sides. The water-side inlet header is located on the outer side of the lower flue gas cooling module, and the water-side outlet header is located on the outer side of the upper flue gas cooling module. A connecting pipe is provided between the water-side inlet header and the water-side outlet header. The connecting pipe is located in the middle of the outer side of the upper and lower flue gas cooling modules.

[0010] Furthermore, the outer side of the water-side inlet header is connected to an external pipe for the intake of heat exchange medium. The water-side inlet header is connected to the inlet end of the heat exchange tube bundle located in the lower flue gas cooling module, and the outlet end of the heat exchange tube bundle located in the lower flue gas cooling module is connected to the lower end of the connecting pipe.

[0011] Furthermore, the water inlet of the heat exchange tube bundle in the upper flue gas cooling module is connected to the upper end of the connecting pipe, the water outlet of the heat exchange tube bundle in the upper flue gas cooling module is connected to one end of the water-side outlet header, and the other end of the water-side outlet header is connected to the outlet pipe located outside the flue gas channel formed by the upper and lower flue gas cooling modules.

[0012] Preferably, the connecting pipe is used to switch between the liquid outlet of the heat exchange tube bundle provided in the lower flue gas cooling module and the liquid inlet of the heat exchange tube bundle provided in the upper flue gas cooling module.

[0013] Compared with the prior art, the present invention has the following significant advantages: ① Low system resistance and good sealing: By eliminating the connecting flues between modules, the flue gas flow is smoother, significantly reducing system resistance. At the same time, the direct stacking and connection (welding) forms a fully sealed system, fundamentally eliminating air and smoke leakage problems.

[0014] ② Compact structure and space saving: The modules are directly stacked, which greatly reduces the vertical or horizontal space occupied by the equipment, making it particularly suitable for technical transformation and project upgrades in existing factories with limited space.

[0015] ③Simplify the structure and reduce costs: By using the frame of the flue gas cooling module itself as the supporting structure, the additional steel frame designed and installed for the flue gas cooling module is eliminated, which simplifies the basic requirements and saves material and installation costs.

[0016] ④ Shorten project cycle: The modules are manufactured, pre-assembled and tested independently in the factory. On-site installation only requires hoisting, stacking and final connection, which greatly reduces the amount of on-site construction and uncertainty. The design, manufacturing and installation cycle is significantly shortened, which is conducive to the rapid commissioning of the project. Attached Figure Description

[0017] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This utility model Figure 1 Side view; Figure 3 This utility model Figure 1 Top view. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] A directly stacked modular flue gas cooling device, such as Figures 1 to 3 As shown, the system includes two flue gas cooling modules arranged vertically, connected by direct stacking. Each flue gas cooling module includes a supporting frame steel 5. The bottom of the frame steel 5 of the upper module is sealed and welded to the top of the frame steel 5 of the lower module. A sealing plate 6 is also sealed and welded to the outer surface of the frame steel 5, forming a fully sealed welded box structure. The bottom of the upper module and the top of the lower module are directly sealed and connected, ensuring that the flue gas channels formed by the upper and lower modules are aligned and interconnected. This eliminates any bends or transitions in the flue gas flow.

[0021] In this invention, two adjacent flue gas cooling modules each have a heat exchange tube bundle 2 within their frame steel 5. A water-side inlet header 1 and a water-side outlet header 4 are located on the outer side of the flue gas cooling module. The water-side inlet header 1 is located on the outer side of the lower flue gas cooling module, and the water-side outlet header 4 is located on the outer side of the upper flue gas cooling module. A connecting pipe 3 is located between the water-side inlet header 1 and the water-side outlet header 4, at the middle of the outer side of the upper and lower flue gas cooling modules. The connecting pipe 3 is used to switch between the liquid outlet of the heat exchange tube bundle 2 in the lower flue gas cooling module and the liquid inlet of the heat exchange tube bundle 2 in the upper flue gas cooling module.

[0022] In this invention, the water-side inlet header 1 is connected to an external pipe on its outer side for introducing the heat exchange medium. The water-side inlet header 1 is connected to the water inlet end of the heat exchange tube bundle 2 located in the lower flue gas cooling module, and the water outlet end of the heat exchange tube bundle 2 located in the lower flue gas cooling module is connected to the lower end of the connecting pipe 3. The water inlet end of the heat exchange tube bundle 2 located in the upper flue gas cooling module is connected to the upper end of the connecting pipe 3, and the water outlet end of the heat exchange tube bundle 2 located in the upper flue gas cooling module is connected to one end of the water-side outlet header 4. The other end of the water-side outlet header 4 is connected to the outlet pipe located outside the flue gas passage formed by the upper and lower flue gas cooling modules.

[0023] In this invention, the frame of the flue gas cooling module itself has sufficient structural strength to withstand the entire load of the upper module and its internal medium, without the need for additional supporting steel structures. The heat exchange tube bundles of each flue gas cooling module are modular integral structures, prefabricated, assembled, and tested in the manufacturing plant.

[0024] In this invention, the flue gas cooling modules are manufactured, frame welded, and tube bundle pressure tested at the equipment manufacturer, and then transported to the site as a complete unit. During installation, the lower flue gas cooling module is first positioned, and then the upper flue gas cooling module is directly hoisted and stacked on top using hoisting equipment. Finally, the final welding or bolt tightening at the joints and the external insulation construction are completed.

[0025] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any transformations or substitutions that can be understood by those skilled in the art within the technical scope disclosed in this utility model should be included within the scope of this utility model.

Claims

1. A directly stacked modular flue gas cooling device, characterized in that, It includes at least two vertically arranged smoke cooling modules, with the two adjacent smoke cooling modules connected by direct stacking; wherein the bottom of the upper smoke cooling module is sealed to the top of the lower smoke cooling module, and the flue gas channels formed by the upper and lower smoke cooling modules are aligned and connected to each other.

2. The direct-stack modular flue gas cooling device according to claim 1, characterized in that, The smoke cooling module includes a supporting frame steel. The bottom of the frame steel in the upper smoke cooling module is sealed and welded to the top of the frame steel in the lower smoke cooling module. A sealing plate is sealed and welded to the outer surface of the frame steel to form a fully sealed welded box structure.

3. The direct-stack modular flue gas cooling device according to claim 2, characterized in that, It includes two flue gas cooling modules arranged vertically. Each flue gas cooling module has a water-side inlet header and a water-side outlet header on its outer side. The water-side inlet header is located on the outer side of the lower flue gas cooling module, and the water-side outlet header is located on the outer side of the upper flue gas cooling module. A connecting pipe is provided between the water-side inlet header and the water-side outlet header, and the connecting pipe is located in the middle of the outer side of the upper and lower flue gas cooling modules.

4. The direct-stack modular flue gas cooling device according to claim 3, characterized in that, The water-side inlet header is connected to an external pipe on its outer side for the intake of heat exchange medium. The water-side inlet header is connected to the inlet end of the heat exchange tube bundle located in the lower flue gas cooling module. The outlet end of the heat exchange tube bundle located in the lower flue gas cooling module is connected to the lower end of the connecting pipe.

5. The direct-stack modular flue gas cooling device according to claim 4, characterized in that, The inlet end of the heat exchange tube bundle in the upper flue gas cooling module is connected to the upper end of the connecting pipe, and the outlet end of the heat exchange tube bundle in the upper flue gas cooling module is connected to one end of the water-side outlet header. The other end of the water-side outlet header is connected to the outlet pipe located outside the flue gas channel formed by the upper and lower flue gas cooling modules.

6. The direct-stack modular flue gas cooling device according to claim 3, characterized in that, The connecting pipe is used to switch between the liquid outlet of the heat exchange tube bundle in the lower flue gas cooling module and the liquid inlet of the heat exchange tube bundle in the upper flue gas cooling module.

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