Improved flue gas cooling device

Abstract

The utility model discloses an improved flue gas cooling device which is arranged at a flue gas pipeline at an inlet of a bag-type dust collector and comprises a first bottom box arranged on the side of the flue gas pipeline, and first connecting pipelines used for welding connection are arranged on the flue gas pipeline and the near side wall of the first bottom box respectively. A first temporary connecting structure is arranged between the two first connecting pipelines; the top end of the first bottom box is connected with a first heat dissipation pipeline which is vertically arranged, the top end of the smoke pipeline is connected with a smoke return heat dissipation pipeline which is vertically arranged, and the smoke return heat dissipation pipeline is connected with the top end of the first heat dissipation pipeline; and a flow control mechanism is arranged on the flue gas pipeline and is positioned above the first connecting pipeline. The cooling device is small in occupied area, convenient to construct and good in cooling effect.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas treatment, in particular to an improved flue gas cooling device. Background Art

[0002] Indirect zinc oxide production uses a kiln, which is equipped with a melting crucible and an evaporation crucible. The natural gas supplied is first used to heat the evaporation crucible, and the melting crucible uses the evaporation crucible to heat the flue gas used to melt the raw materials. The flue gas after the melting crucible is discharged from the flue duct opened on the side wall of the kiln. In actual production, such as Figure 6 As shown in the figure, multiple kilns are arranged in a workshop for centralized production. The flue gas generated by the kiln is uniformly transported to the bag filter and denitrification equipment at the edge of the workshop through the underground flue for dust removal and denitrification. Among them, the flue gas output by the kiln is generally above 300°C, and the filter bags in the bag filter cannot withstand this high temperature. Therefore, the flue gas needs to be cooled in advance. However, since the subsequent denitrification treatment still requires a high temperature of about 220°C to maintain the denitrification efficiency, the kiln flue gas cannot be reduced to too low a temperature. After testing, the flue gas temperature was reduced to about 170°C before the bag filter, which can not only significantly reduce the ablation of the bag, but also facilitate the subsequent temperature increase to the temperature required for denitrification. However, due to the difference in ambient temperature in different seasons and the number of kilns put into production at the same time, the temperature of about 170°C is difficult to control.

[0003] To this end, the inventor proposed a solution of connecting a heat dissipation duct in parallel with the existing flue gas duct, and achieved the purpose of stabilizing the flue gas temperature before the bag filter by controlling the ratio of the amount of flue gas directly entering from the flue gas duct and the amount of flue gas dissipated from the heat dissipation duct. However, since the bag filter and the flue gas duct are mostly arranged in the workshop, it is difficult to extend the heat dissipation duct to the outdoors; and the equipment at the edge of the workshop is complicated, and there is not much space for the heat dissipation duct, so it can only be arranged in the three-dimensional space corresponding to the limited ground projection area next to the flue gas duct. For this reason, the heat dissipation duct should be improved by comprehensively considering the spatial conditions, construction convenience and cooling effect, and the invention is born from this. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide an improved flue gas cooling device which occupies a small area, is convenient to construct and has a good cooling effect.

[0005] In order to solve the above technical problems, the technical solution of the utility model is: an improved flue gas cooling device, which is arranged at the flue gas duct at the inlet of the bag collector, including a first bottom box arranged on the side of the flue gas duct, and the flue gas duct and the near side wall of the first bottom box are respectively provided with first connecting pipes for welding connection, and a first temporary connecting structure is provided between the two first connecting pipes; the top of the first bottom box is connected to a vertically arranged first heat dissipation pipe, and the top of the flue gas duct is connected to a vertically arranged return smoke heat dissipation pipe, and the return smoke heat dissipation pipe and the top of the first heat dissipation pipe are connected; a flow control mechanism is provided on the flue gas duct above the first connecting pipe.

[0006] As a preferred technical solution, a second bottom box is provided on the side of the first bottom box away from the flue gas duct, and second connecting pipes for welding connection are respectively provided on the near side walls of the first bottom box and the second bottom box, and a second temporary connecting structure is provided between the two second connecting pipes; the top of the second bottom box is connected to a vertically arranged second heat dissipation pipe, and the second heat dissipation pipe, the smoke return heat dissipation pipe and the top of the first heat dissipation pipe are connected together.

[0007] As a preferred technical solution, the second connecting pipe is arranged higher than the first connecting pipe.

[0008] As a preferred technical solution, the connection point between the first heat dissipation pipeline and the second heat dissipation pipeline is lower than the connection point between the first heat dissipation pipeline and the smoke return heat dissipation pipeline.

[0009] As a preferred technical solution, the second temporary connection structure includes second connecting flanges fixedly welded on the proximal ends of the two second connecting pipes, and corresponding second temporary connection ear plates fixedly welded on the distal sides of the two second connecting flanges, and the corresponding two second temporary connection ear plates are bolted together.

[0010] As a preferred technical solution, the first temporary connection structure includes first connecting flanges fixedly welded on the proximal ends of the two first connecting pipes, and corresponding first temporary connection ear plates fixedly welded on the distal sides of the two first connecting flanges, and the corresponding two first temporary connection ear plates are bolted together.

[0011] As a preferred technical solution, the flow control mechanism includes a flow control valve plate radially inserted in the smoke duct, and a pull-out avoidance opening corresponding to the flow control valve plate is provided on the side wall of the smoke duct.

[0012] Due to the adoption of the above technical scheme, the improved flue gas cooling device is arranged at the flue gas duct at the inlet of the bag filter, including a first bottom box arranged on the side of the flue gas duct, and the first connecting pipes for welding connection are respectively arranged on the near side walls of the flue gas duct and the first bottom box, and a first temporary connecting structure is arranged between the two first connecting pipes; the top of the first bottom box is connected with a vertically arranged first heat dissipation pipe, and the top of the flue gas duct is connected with a vertically arranged return smoke heat dissipation pipe, and the return smoke heat dissipation pipe and the top of the first heat dissipation pipe are connected and arranged; a flow control mechanism is arranged above the first connecting pipe on the flue gas duct. The utility model uses the first bottom box as the bearing structure to arrange the vertical first heat dissipation pipe, and the pipe is firm and stable, and no additional support measures are required, which is conducive to simplifying the structure and construction. The first bottom box and the flue gas duct are first connected by the first temporary connecting structure to complete the connection between the two first connecting pipes, and then the two first connecting pipes are welded to form the connection of the heat dissipation channel, which is convenient for construction. The vertically arranged first heat dissipation pipe and the return smoke heat dissipation pipe can be arranged within a limited ground projection range, and the footprint is small. By providing the smoke return heat dissipation duct, the height of the first heat dissipation duct is increased in disguise, and the total length of the smoke heat dissipation channel is significantly increased, which can generate more sufficient heat dissipation time and achieve a good cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The following drawings are only intended to illustrate and explain the present invention, and do not limit the scope of the present invention.

[0014] Figure 1 It is a structural principle diagram of an embodiment of the utility model;

[0015] Figure 2 yes Figure 1 A schematic diagram of the enlarged structure of the first bottom box and the second bottom box;

[0016] Figure 3 yes Figure 2 Schematic diagram of BB structure;

[0017] Figure 4 yes Figure 2 An enlarged schematic diagram of the cross-sectional structure of the first bottom box;

[0018] Figure 5 yes Figure 1 A-direction structural schematic diagram;

[0019] Figure 6 This is the layout diagram of the kiln and bag filter in the existing zinc oxide production workshop.

[0020] In the figure: 1-kiln; 2-bag filter; 3-smoke duct; 31-underground flue; 32-smoke inlet duct; 33-smoke return heat dissipation duct; 4-first bottom box; 41-first connecting duct; 42-first heat dissipation duct; 5-first temporary connection structure; 51-first connecting flange; 52-first temporary connection ear plate; 6-second bottom box; 61-second connecting duct; 62-second heat dissipation duct; 7-second temporary connection structure; 8-flow control mechanism. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with the accompanying drawings and examples. In the following detailed description, only certain exemplary embodiments of the present invention are described by way of illustration. Needless to say, those skilled in the art will recognize that the described embodiments may be modified in various ways without departing from the spirit and scope of the present invention. Therefore, the drawings and descriptions are illustrative in nature and are not intended to limit the scope of protection of the claims.

[0022] like Figures 1 to 5 As shown in common, the improved flue gas cooling device is arranged at the flue gas duct 3 at the inlet of the bag-type dust collector 2. The flue gas duct 3 is vertically arranged, and the lower end is connected to the underground flue 31. A smoke inlet duct 32 connected to the inlet flange of the bag-type dust collector 2 is opened on the side wall at the upper end. The above is the prior art and will not be repeated here.

[0023] The device includes a first bottom box 4 arranged on the side of the smoke pipe 3. The first bottom box 4 is directly placed on the ground to form a base for bearing, and its internal space is used to form an intermediate space for the transfer pipe. In this embodiment, the first bottom box 4 is a cylindrical structure, but it can also be a square column.

[0024] The first connecting pipes 41 for welding connection are respectively provided on the proximal side walls of the flue gas duct 3 and the first bottom box 4, and a first temporary connecting structure 5 is provided between the two first connecting pipes 41. During construction, the first bottom box 4 is hoisted by a hoisting device such as a crane or a traveling crane, and accordingly, the first bottom box 4 should be provided with a hoisting ring or a hoisting ear and other structures for hoisting; the hoisting process makes the first bottom box 4 just leave the ground by a small distance, so as to facilitate the adjustment of the position of the first bottom box 4 with manpower, and finally make the proximal ends of the two first connecting pipes 41 initially butt; at this time, the first temporary connecting structure 5 is used to form a preliminary connection between the two first connecting pipes 41, and the first bottom box 4 is lowered to make it sit on the ground, and the first temporary connecting structure 5 is used to further tighten the connection, so that the proximal ends of the two first connecting pipes 41 are in close contact; the two first connecting pipes 41 are welded to achieve the pipeline connection between the first bottom box 4 and the flue gas duct 3.

[0025] The first temporary connection structure 5 of this embodiment includes first connection flanges 51 fixedly welded on the proximal ends of the two first connection pipes 41, and corresponding first temporary connection ear plates 52 are fixedly welded on the distal sides of the two first connection flanges 51, and the corresponding two first temporary connection ear plates 52 are bolted. The initial connection and further tightening connection between the two first connection pipes 41 are achieved by bolting. Since there is an action of the first bottom box 4 leaning against the ground between the initial connection and the further tightening connection, a slight drop will be generated between the two first connection pipes 41, so the holes for bolting in the two first temporary connection ear plates 52 are preferably vertical long holes to adapt to the above drop. After further connection, the welding of the two first connection pipes 41 is actually the welding between the two first connection flanges 51. The first temporary connection ear plate 52 is set on the distal sides of the two first connection flanges 51, which can make way for the weld position between the two first connection flanges 51 to avoid affecting the welding. The provision of the first connection flange 51 can increase the contact area between the proximal ends of the two first connection pipes 41, avoid the influence of slight misalignment of the two first connection pipes 41 caused by welding error, position error, etc., ensure effective welding connection, and ensure reliable communication between the flue gas pipe 3 and the first bottom box 4. After welding, the bolts between the two first temporary connection ear plates 52 can be removed or retained according to actual conditions, and are not limited here.

[0026] The top of the first bottom box 4 is connected to a vertically arranged first heat dissipation pipe 42. The first heat dissipation pipe 42 is preferably implemented by a high temperature resistant ventilation pipe. This pipe material is well known and commonly used, and will not be described in detail here. The first heat dissipation pipe 42 is preferably connected to the top of the first bottom box 4 by a flange. Specifically, a top opening corresponding to the first heat dissipation pipe 42 is opened on the top wall of the first bottom box 4. A first bottom flange is fixedly provided at the lower end of the first heat dissipation pipe 42. The first bottom flange is bolted to the top wall of the first bottom box 4.

[0027] The top of the flue gas duct 3 is connected to a vertically arranged smoke return heat dissipation duct 33, and the smoke return heat dissipation duct 33 is also preferably implemented by a high-temperature resistant ventilation pipe, and it is also preferably connected to the top of the flue gas duct 3 by a flange. The smoke return heat dissipation duct 33 and the top of the first heat dissipation duct 42 are connected and arranged to realize the connection of the heat dissipation pipeline. Based on the fact that the smoke return heat dissipation duct 33 and the first heat dissipation duct 42 are both arranged vertically, the upper ends of the two are connected by a 180° elbow, and this elbow is also implemented by a high-temperature resistant ventilation pipe, and it is also preferably connected to the two pipes by a flange. During construction, the smoke return heat dissipation duct 33 and the first heat dissipation duct 42 are pre-assembled together, and then hoisted by a lifting device to form a vertical state, and the lower ends of the smoke return heat dissipation duct 33 and the first heat dissipation duct 42 are flange-connected to the corresponding pipes or bottom boxes respectively.

[0028] The flue gas duct 3 is provided with a flow control mechanism 8 above the first connecting duct 41 to control the amount of flue gas entering the bag filter 2 from the flue gas duct 3, and the excess flue gas is mixed with the flue gas directly transported from the flue gas duct 3 at the smoke inlet duct 32 after passing through the first connecting duct 41, the first bottom box 4, the first heat dissipation duct 42 and the return smoke heat dissipation duct 33. Therefore, by controlling the ratio of the amount of flue gas directly entering from the flue gas duct 3 and the amount of flue gas entering after heat dissipation, the purpose of stabilizing the flue gas temperature before the bag filter 2 can be achieved.

[0029] The flow control mechanism 8 of this embodiment includes a flow control valve plate radially inserted in the flue gas duct 3, and a pull-out avoidance port corresponding to the flow control valve plate is provided on the side wall of the flue gas duct 3. The depth of the flow control valve plate inserted into the flue gas duct 3 changes the cross-sectional area of ​​the flow, and changes the amount of flue gas directly entering the bag filter 2 at the flue gas duct 3.

[0030] In this embodiment, the first bottom box 4 is used as the bearing structure to set the first vertical heat dissipation pipe 42. The pipe is firm and stable, and no additional support measures are required, which is conducive to simplifying the structure and construction. The first bottom box 4 and the flue gas pipe 3 first complete the connection between the two first connecting pipes 41 through the first temporary connection structure 5, and then the two first connecting pipes 41 are welded to form the connection of the heat dissipation channel. The construction process does not require manpower to lift the structural parts, and the two first connecting pipes 41 can be closely connected, which is convenient for construction. The vertically arranged first heat dissipation pipe 42 and the return smoke heat dissipation pipe 33 can be arranged within a limited ground projection range, and occupy a small area. By setting the return smoke heat dissipation pipe 33, the height of the first heat dissipation pipe 42 is increased in disguise, and the total length of the flue gas heat dissipation channel is significantly increased, which can produce more sufficient heat dissipation time and a good cooling effect.

[0031] Preferably, a second bottom box 6 is provided on the side of the first bottom box 4 away from the flue gas duct 3, and a second connecting pipe 61 for welding connection is respectively provided on the near side wall of the first bottom box 4 and the second bottom box 6, and a second temporary connecting structure 7 is provided between the two second connecting pipes 61; the top of the second bottom box 6 is connected to a second vertically arranged heat dissipation pipe 62, and the second heat dissipation pipe 62, the return smoke heat dissipation pipe 33 and the top of the first heat dissipation pipe 42 are connected together. In this embodiment, a parallel heat dissipation pipe is added to slow down the overall flow speed of the flue gas at the heat dissipation pipe and increase the heat dissipation area, so as to achieve a better cooling effect, which can further reduce the influence of seasonal temperature difference and promote the stability of the flue gas before the bag filter 2.

[0032] Among them, the second heat dissipation pipe 62 also adopts a bottom box to form a load-bearing structure, and the second bottom box 6 is connected to the first bottom box 4 through a second temporary connection structure 7. The second temporary connection structure 7 and the first temporary connection structure 5 adopt the same structural principle, that is, the second temporary connection structure 7 includes a second connection flange fixedly welded on the proximal ends of the two second connection pipes 61, and a corresponding second temporary connection ear plate is fixedly welded on the distal sides of the two second connection flanges, and the corresponding two second temporary connection ear plates are bolted. Accordingly, the connection of the two second connection pipes 61 and the connection of the two first connection pipes 41 have the same construction method, which will not be repeated here. Of course, the connection of the two second connection pipes 61 should be carried out after the connection of the two first connection pipes 41.

[0033] Preferably, the second connecting pipe 61 is arranged higher than the first connecting pipe 41 to promote the flue gas to enter the second heat dissipation pipe 62 better, so that the second heat dissipation pipe 62 can achieve better heat dissipation. Preferably, the connection point between the first heat dissipation pipe 42 and the second heat dissipation pipe 62 is lower than the connection point between the first heat dissipation pipe 42 and the smoke return heat dissipation pipe 33, so that the total length of the second heat dissipation pipe 62 is smaller, and the path is less curved, and more flue gas can easily pass through the second heat dissipation pipe 62, further promoting the slowing down of the heat dissipation flow rate, and further improving the heat dissipation effect. The second heat dissipation pipe 62 is realized by a tee plus a 90° elbow at the upper end of the first heat dissipation pipe 42. The second heat dissipation pipe 62, the above tees and elbows are also preferably high-temperature resistant ventilation pipes, and are also preferably flange-connected to each other. Based on the setting of the second heat dissipation pipe 62, the smoke return heat dissipation pipe 33, the first heat dissipation pipe 42 and the second heat dissipation pipe 62 should be pre-assembled together, and then jointly hoisted to achieve flange connection with the corresponding pipe or bottom box.

[0034] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. The improved flue gas cooling device is installed in the flue gas duct at the inlet of the bag filter, and is characterized by: It includes a first bottom box arranged on the side of the flue gas duct, and first connecting pipes for welding connection are respectively arranged on the near side walls of the flue gas duct and the first bottom box, and a first temporary connecting structure is arranged between the two first connecting pipes; the top of the first bottom box is connected to a vertically arranged first heat dissipation pipe, and the top of the flue gas duct is connected to a vertically arranged smoke return heat dissipation pipe, and the top of the smoke return heat dissipation pipe and the first heat dissipation pipe are connected; a flow control mechanism is arranged on the flue gas duct above the first connecting pipe.

2. The improved flue gas cooling device according to claim 1, characterized in that: A second bottom box is provided on the side of the first bottom box away from the flue gas duct, and second connecting pipes for welding connection are respectively provided on the proximal walls of the first bottom box and the second bottom box, and a second temporary connecting structure is provided between the two second connecting pipes; a vertically arranged second heat dissipation pipe is connected to the top of the second bottom box, and the second heat dissipation pipe, the smoke return heat dissipation pipe and the top of the first heat dissipation pipe are connected together.

3. The improved flue gas cooling device according to claim 2, characterized in that: The second connecting pipe is arranged higher than the first connecting pipe.

4. The improved flue gas cooling device according to claim 2, characterized in that: The connection point between the first heat dissipation pipe and the second heat dissipation pipe is lower than the connection point between the first heat dissipation pipe and the smoke return heat dissipation pipe.

5. The improved flue gas cooling device according to claim 2, characterized in that: The second temporary connection structure includes second connection flanges fixedly welded on the proximal ends of the two second connection pipes, and corresponding second temporary connection ear plates fixedly welded on the distal sides of the two second connection flanges, and the corresponding two second temporary connection ear plates are bolted to each other.

6. The improved flue gas cooling device according to claim 1, characterized in that: The first temporary connection structure includes first connection flanges fixedly welded on the proximal ends of the two first connection pipes, and corresponding first temporary connection ear plates fixedly welded on the distal sides of the two first connection flanges, and the corresponding two first temporary connection ear plates are bolted to each other.

7. The improved flue gas cooling device according to claim 1, characterized in that: The flow control mechanism comprises a flow control valve plate radially inserted in the smoke duct, and a pull-out avoidance opening corresponding to the flow control valve plate is provided on the side wall of the smoke duct.

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