A drain device and a waste heat boiler

Abstract

This utility model discloses a draining device and a waste heat boiler, belonging to the field of boiler equipment technology. The draining device includes a drain pipe, a first sleeve, and a drain pipe. The first sleeve is fitted onto and connected to the outside of the drain pipe, and there is a gap between the wall of the first sleeve and the wall of the drain pipe. The drain pipe is fitted onto and connected to the outside of the first sleeve, and there is a gap between the wall of the drain pipe and the wall of the first sleeve. One end of the drain pipe is provided with a drain port, and the other end of the drain pipe is provided with an inlet. The height of the inlet is located between the two ends of the first sleeve. This application can reduce the probability of damage to the drain pipe and ensure the normal operation of the waste heat boiler.

Description

Technical Field

[0001] This utility model belongs to the technical field of boiler equipment, specifically relating to a drainage device and a waste heat boiler. Background Technology

[0002] Waste heat boilers are widely used in steel enterprises for waste heat recovery and utilization in processes such as sintering and coking, and are mostly flue-type metal structures. Specifically, flue gas circulates within the waste heat boiler, where multiple heat exchange modules transfer heat to the flue gas. Drainage pipes are also installed within the waste heat boiler for production wastewater discharge and pressure drainage. Water is commonly used as the heat exchange medium in the heat exchange modules. When a heat exchange module is damaged, causing water to leak into the boiler, the leaked water will dissolve substances in the flue gas and accumulate at the bottom of the waste heat boiler, corroding the inner wall of the boiler, the heat exchange modules, and the drainage pipes. If the drainage pipes are damaged by corrosion, the operation of the waste heat boiler will be affected. Utility Model Content

[0003] This application aims to at least partially solve the technical problem that drainage pipes are prone to corrosion and damage. To this end, this application provides a drainage device and a waste heat boiler.

[0004] The technical solution of this application is as follows:

[0005] A hydrophobic device, the hydrophobic device comprising:

[0006] Drainage pipe;

[0007] The first sleeve is sleeved and connected to the outside of the drain pipe, and there is a gap between the wall of the first sleeve and the wall of the drain pipe.

[0008] A drain pipe is sleeved and connected to the outside of the first sleeve. There is a gap between the wall of the drain pipe and the wall of the first sleeve. One end of the drain pipe is provided with a drain port, and the other end of the drain pipe is provided with an inlet. The height of the inlet is located between the two ends of the first sleeve.

[0009] In some embodiments, a base plate is provided between the drain pipe and the first sleeve, and the base plate connects the drain pipe and the first sleeve to form a water storage cavity between the drain pipe, the base plate, and the first sleeve.

[0010] In some embodiments, the drain outlet is located on the base plate, and the drain outlet is detachably equipped with a sealing element.

[0011] In some embodiments, the drain pipe includes a connected second sleeve and a corrugated sleeve, with the base plate disposed at the end of the corrugated sleeve away from the second sleeve.

[0012] In some embodiments, the length of the drain pipe is less than the length of the first sleeve, and neither the inlet nor the outlet extends beyond the end of the sleeve.

[0013] In some embodiments, the drain port is detachably connected to a drain hose.

[0014] In some embodiments, two sealing plates are provided between the first sleeve and the drain pipe. The sealing plates are annular in shape, with the inner circle of the sealing plate fixedly connected to the drain pipe and the outer circle of the sealing plate fixedly connected to the first sleeve, so that an insulation cavity is formed between the outer wall of the drain pipe, the inner wall of the first sleeve, and the two sealing plates.

[0015] In some embodiments, the insulation cavity is filled with an insulation layer.

[0016] In some embodiments, the insulation layer is an asbestos rope wrapped around the outer wall of the drainage pipe.

[0017] A waste heat boiler includes a furnace body and a drainage device. The bottom wall of the furnace body is provided with a drain outlet, which is connected to the liquid inlet of the drainage device. The liquid outlet of the water supply device is located outside the furnace body.

[0018] The embodiments of this application have at least the following beneficial effects:

[0019] As can be seen from the above technical solution, the drain device and waste heat boiler disclosed in this application are sequentially connected by a drain pipe, a first sleeve, and a drain pipe, making the entire drain device an integrated unit. This provides good sealing to suit the use of the waste heat boiler. The upper part of the drain pipe is shielded by the first pipe, preventing acidic liquid from contacting the drain pipe. The first sleeve and drain pipe protect the drain pipe, reducing acidic liquid accumulation in the waste heat boiler and improving its stability and safety during operation. Simultaneously, by periodically checking the amount of acidic liquid discharged from the drain pipe, operators can determine if a leak has occurred in the waste heat boiler, facilitating timely maintenance. Furthermore, the gap between the drain pipe wall and the first sleeve wall also reduces contact between acidic liquid and the first sleeve to some extent, improving the durability of the drain device. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A schematic diagram of the hydrophobic device in an embodiment of this application is shown;

[0022] Figure 2 This illustration shows a schematic diagram of the structure of the condensate drain device installed inside the waste heat boiler in an embodiment of this application.

[0023] The markings in the diagram are: 100-Drainage pipe, 200-First sleeve, 210-Sealing plate, 220-Insulation cavity, 230-Insulation layer, 300-Drain pipe, 310-Drain port, 320-Inlet port, 330-Bottom plate, 340-Second sleeve, 350-Corrugated sleeve, 400-Sealing component, 500-Furnace body. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0025] Furthermore, reference numerals and / or reference letters may be repeated in different examples in this application. Such repetition is for simplification and clarity purposes and does not in itself indicate a relationship between the various embodiments and / or settings discussed. In addition, this application provides examples of various specific processes and materials; however, those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0026] Specifically, because the heat exchange module is located inside the boiler and typically includes multiple heat exchange tubes, the leak is difficult to detect in its early stages. The leak will continue to worsen, exacerbating the accumulation of water at the bottom of the waste heat boiler. Simultaneously, dust and denitrification derivatives in the flue gas crystallize and adhere to the heat exchange tubes, eventually dissolving in the leaked water. This produces an acidic solution with a pH of 2.5-4.5. If this acidic solution cannot be drained promptly, it will corrode the drain tubes, causing leaks or even tube ruptures, posing a significant safety hazard.

[0027] This application is described below with reference to the accompanying drawings and specific embodiments:

[0028] like Figure 1 and Figure 2 As shown, this embodiment provides a drainage device, including a drainage pipe 100, a first sleeve 200 and a drain pipe 300. The drainage pipe 100 is the pipe in the waste heat boiler used for production sewage discharge and pressure drainage.

[0029] The first sleeve 200 is sleeved and connected to the outside of the drain pipe 100, and there is a gap between the wall of the first sleeve 200 and the wall of the drain pipe 100; the drain pipe 300 is sleeved and connected to the outside of the first sleeve 200, and there is a gap between the wall of the drain pipe 300 and the wall of the first sleeve 200. One end of the drain pipe 300 is provided with a drain port 310, and the other end of the drain pipe 300 is provided with an inlet port 320. The height of the inlet port 320 is located between the two ends of the first sleeve 200.

[0030] The drain pipe 100, the first sleeve 200, and the drain pipe 300 are sequentially connected and nested together, making the entire drain device an integrated unit. This provides good sealing for use with a waste heat boiler. There is a gap between the wall of the first sleeve 200 and the wall of the drain pipe 100, forming a chamber between the drain pipe 100 and the first pipe. The chamber has a certain heat preservation function, and the connection points between the first sleeve 200 and the drain pipe 100 are few in number. The chamber can accommodate the free expansion of the drain pipe 100, ensuring the sealing of the waste heat boiler. The inlet 320 and outlet 310 of the drain pipe 300 provide a channel for discharging acidic liquid. The inlet 320 is positioned between the two ends of the first sleeve 200, meaning that acidic liquid in the waste heat boiler enters the drain pipe 300 through the inlet 320 and is discharged through the outlet 310, thus reducing the amount of acidic liquid in the waste heat boiler. The upper part of the drain pipe 100 is blocked by the first pipe, preventing acidic liquid from contacting it. The first sleeve 200 and the drain pipe 300 protect the drain pipe 100, reducing acidic liquid accumulation in the waste heat boiler and improving its stability and safety during operation. Furthermore, by periodically checking the amount of acidic liquid discharged from the drain pipe 100, operators can determine if a leak has occurred in the waste heat boiler, facilitating timely maintenance. Of course, the gap between the wall of the drain pipe 300 and the wall of the first sleeve 200 can also reduce the contact between the acidic liquid and the first sleeve 200 to a certain extent, thereby improving the durability of the hydrophobic device.

[0031] In some embodiments, a base plate 330 is provided between the drain pipe 300 and the first sleeve 200. The base plate 330 connects the drain pipe 300 and the first sleeve 200 to form a water storage cavity between the drain pipe 300, the base plate 330, and the first sleeve 200. The base plate 330 is a structural component connecting the drain pipe 300 and the first sleeve 200. The base plate 330 is located at the bottom end of the drain pipe 300, giving the drain pipe 300 a barrel-shaped structure, thus providing a water storage cavity capable of accommodating acidic liquid. This reduces the accumulation of acidic liquid on the bottom wall of the waste heat boiler, mitigating the impact of acidic liquid on the waste heat boiler. Furthermore, compared to repairing the bottom wall of the waste heat boiler, directly replacing the drain device is more efficient and facilitates maintenance by operators. The base plate 330 can be connected to the drain pipe 300 by screwing it in for easy replacement.

[0032] In some embodiments, the drain port 310 is located on the base plate 330, and a sealing element 400 is detachably installed on the drain port 310. The sealing element 400 is used to seal the drain port 310 to ensure that flue gas does not leak during the operation of the waste heat boiler. Operators can choose whether to remove the sealing element to drain the acidic liquid based on the amount of acidic liquid accumulated. The drain port 310 being located on the base plate 330 can reduce acidic liquid residue. Of course, in other embodiments, the drain port 310 can also be located on the side wall of the drain pipe 300, with the drain port 310 positioned close to the base plate 330.

[0033] In some embodiments, the drain pipe 300 may be equipped with a liquid level acquisition mechanism to acquire the liquid level of the acidic liquid in the water storage chamber, so as to facilitate the operator to determine whether the acidic liquid needs to be drained. The liquid level acquisition mechanism may be a transparent component or a liquid level gauge disposed on the side wall of the drain pipe 300.

[0034] In some embodiments, the drain pipe 300 includes a connected second sleeve 340 and a corrugated sleeve 350, with a base plate 330 disposed at the end of the corrugated sleeve 350 away from the second sleeve 340. The corrugated sleeve 350 has good expansion and / or contraction capabilities, enabling it to better adapt to the waste heat boiler and reduce the reduction in the boiler's sealing performance due to thermal expansion and contraction during use. In some embodiments, the second sleeve 340 and the corrugated sleeve 350 are detachably connected for ease of maintenance by operators.

[0035] In some embodiments, the length of the drain pipe 300 is less than the length of the first sleeve 200, and neither the inlet 320 nor the outlet 310 extends beyond the end of the sleeve. It is understood that the first sleeve 200 and the drain pipe 100 are connected by a first connector. Generally, the first connector is connected to the first sleeve 200 and the drain pipe 100 by a sealing weld. When the drain pipe 300 contains acidic liquid, the acidic liquid will only contact a portion of the inner wall of the drain pipe 300 and a portion of the outer ring wall of the first sleeve 200, and will not contact the weld of the sealing first connector. This reduces the probability of the first sleeve 200 being corroded through by the acidic liquid.

[0036] In some embodiments, the drain port 310 is detachably connected to a drain hose, that is, the drain direction of the drain port 310 is changed by the hose, so as to reduce the probability that the first pipe and the drain pipe 100 will be splashed and corroded by the discharged acidic liquid.

[0037] In some embodiments, two sealing plates 210 are provided between the first sleeve 200 and the drain pipe 100. The sealing plates 210 are annular, with their inner circles fixedly connected to the drain pipe 100 and their outer circles fixedly connected to the first sleeve 200, thus forming an insulation cavity 220 between the outer wall of the drain pipe 100, the inner wall of the first sleeve 200, and the two sealing plates 210. That is, the first connecting element between the first sleeve 200 and the drain pipe 100 is the sealing plate 210. The two sealing plates 210 can be connected to both ends of the first sleeve 200 by screwing, and then connected to the drain pipe 100 by sealing welding. Alternatively, the sealing plates 210 can be connected to both the first sleeve 200 and the drain pipe 100 by sealing welding. The insulation cavity 220 prevents the temperature of the drain pipe 100 from experiencing a large temperature difference due to its location inside and outside the waste heat boiler, reducing the probability of damage to the drain pipe 100 due to thermal expansion and contraction.

[0038] In some embodiments, the insulation cavity 220 is filled with an insulation layer 230. The insulation layer 230 further improves the insulation effect on the drain pipe 100. The insulation layer 230 is asbestos rope wrapped around the outer wall of the drain pipe 100, but it can also be other structures with insulation effects.

[0039] In some embodiments, the drainage pipe 100, the first sleeve 200, and the drain pipe 300 are coaxially arranged and are all made of 316L stainless steel to improve corrosion resistance.

[0040] This application embodiment also provides a waste heat boiler, including a boiler body 500 and a drain device. The bottom wall of the boiler body 500 is provided with a drain outlet, which is connected to the liquid inlet 320 of the drain device. The drain outlet 310 of the water supply device is located outside the boiler body 500. The acidic liquid accumulated inside the boiler body 500 is discharged through the drain pipe 300, reducing the probability of corrosion of the drain pipe 100 and improving the stability and safety of the waste heat boiler during use.

[0041] In some embodiments, taking a 251.5t / h horizontal dual-pressure waste heat boiler of a CCPP unit as an example, under the maximum evaporation condition, the vertical expansion of the 20m high heat exchange module is 100mm. The height h1 of the first sleeve 200 above the bottom wall of the furnace body 500 should be greater than 100mm to ensure that after the downward expansion due to heat, there is still a margin Δh in the furnace body 500 to protect the drain pipe 100 from contact with acidic liquid. Δh is determined based on the maximum water accumulation height. The length h2 of the first sleeve 200 at the bottom outside the furnace body 500 is greater than the height h3 of the liquid delivery pipe outside the furnace body 500, which not only facilitates welding and installation but also reduces the probability of acidic liquid splashing onto the weld when discharged.

[0042] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0043] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application.

[0044] It should be noted that all directional indications in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0045] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0046] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0047] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0048] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0049] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A hydrophobic device, characterized in that, The hydrophobic device includes: Drainage pipe; The first sleeve is fitted and connected to the outside of the drain pipe, and there is a gap between the wall of the first sleeve and the wall of the drain pipe. A drain pipe is sleeved and connected to the outside of the first sleeve. There is a gap between the wall of the drain pipe and the wall of the first sleeve. One end of the drain pipe is provided with a drain port, and the other end of the drain pipe is provided with an inlet. The height of the inlet is located between the two ends of the first sleeve.

2. The hydrophobic device according to claim 1, characterized in that, A base plate is provided between the drain pipe and the first sleeve, and the base plate connects the drain pipe and the first sleeve to form a water storage cavity between the drain pipe, the base plate and the first sleeve.

3. The hydrophobic device according to claim 2, characterized in that, The drain outlet is located on the base plate, and the drain outlet is detachably equipped with a sealing component.

4. The hydrophobic device according to claim 2, characterized in that, The drain pipe includes a second sleeve and a corrugated sleeve that are connected together, and the base plate is disposed at the end of the corrugated sleeve away from the second sleeve.

5. The hydrophobic device according to claim 1, characterized in that, The length of the drain pipe is less than the length of the first sleeve, and neither the inlet nor the outlet extends beyond the end of the sleeve.

6. The hydrophobic device according to claim 5, characterized in that, The drain port is detachably connected to a drain hose.

7. The hydrophobic device according to claim 1, characterized in that, Two sealing plates are provided between the first sleeve and the drain pipe. The sealing plates are in the shape of a ring. The inner circle of the sealing plate is fixedly connected to the drain pipe, and the outer circle of the sealing plate is fixedly connected to the first sleeve, so that an insulation cavity is formed between the outer wall of the drain pipe, the inner wall of the first sleeve, and the two sealing plates.

8. The hydrophobic device according to claim 7, characterized in that, The insulation cavity is filled with an insulation layer.

9. The hydrophobic device according to claim 8, characterized in that, The insulation layer is an asbestos rope wrapped around the outer wall of the drain pipe.

10. A waste heat boiler, characterized in that, The device includes a furnace body and a drainage device as described in any one of claims 1-9, wherein the bottom wall of the furnace body is provided with a drain outlet, the drain outlet is connected to the liquid inlet of the drainage device, and the liquid outlet of the water supply device is located outside the furnace body.

Images