High-efficiency drainage device for convection tube bundle area of steam boiler

Abstract

The utility model relates to a steam boiler convection pipe bundle area high -efficient drainage device belongs to steam boiler technical field. This steam boiler convection pipe bundle area high -efficient drainage device, include: base and set up its top boiler body, water seal subassembly, water seal subassembly set up boiler body front side below, through the height difference of water inlet pipe and outlet pipe in water seal subassembly, can make the pressure in water tank greater than the flue gas pressure in the inside of guide vane, can effectively prevent flue gas through guide vane overflow, simultaneously condensed water still can ceaselessly discharge, prevent the problem that condensed water accumulates and influences to reduce heat exchange efficiency, causes pipe wall corrosion and local thermal stress concentration problem, through set up lifting plate, motor, screw rod, piston and air bag, can under the condition that condensed water is less in the early stage, utilize the air bag that rises to replace part water volume, make liquid level always higher than the port of water inlet pipe, prevent the leakage of early stage flue gas.

Description

Technical Field

[0001] This utility model relates to the field of steam boiler technology, and in particular to a high-efficiency drainage device for the convection tube bundle area of ​​a steam boiler. Background Technology

[0002] In the structure of a steam boiler, the convection tube bundle area is the core area for heat exchange between high-temperature flue gas and boiler water. It absorbs the waste heat of flue gas through densely arranged tube bundles and heats the water into steam. However, in actual operation, due to factors such as combustion fluctuations, load changes and water quality, condensate accumulation is prone to occur in the convection tube bundle area. If the accumulated water is not drained in time, it will not only reduce the heat exchange efficiency, but also cause problems such as tube wall corrosion and local thermal stress concentration. In severe cases, it may even lead to tube bundle rupture, threatening the safe operation of the boiler.

[0003] Currently, drainage of the convection tube bundle area mainly relies on traditional drainage devices, such as gravity steam traps, mechanical steam traps, or thermodynamic steam traps. However, these technologies have significant limitations in practical applications: for example, in boilers that frequently start and stop or operate at low loads, existing devices are difficult to adapt to dynamically changing water volume and pressure conditions, resulting in drainage delays; at the same time, the oxygen corrosion and acid corrosion problems caused by local water accumulation in the tube bundle area are aggravated, shortening the service life of the tube bundle. In addition, the increasing environmental protection and energy efficiency requirements have also placed higher demands on the response speed, sealing performance, and adaptability of drainage devices. Utility Model Content

[0004] Therefore, it is necessary to provide a high-efficiency drainage device for the convection tube bundle area of ​​a steam boiler to address the problem of condensate accumulation in the aforementioned steam boiler.

[0005] A high-efficiency drainage device for the convection tube bundle area of ​​a steam boiler includes: a base and a boiler body disposed above it;

[0006] A water seal assembly is disposed below the front side of the boiler body;

[0007] The water seal assembly includes a water tank located on the front side of the boiler body. An inlet pipe and an outlet pipe are respectively connected to the rear side and the upper front side of the water tank. The inlet pipe extends to the lower inner part of the water tank, and the outlet pipe is higher than the inlet pipe. A lifting plate is vertically slidably connected in the water tank.

[0008] In one embodiment, the water seal assembly further includes a housing disposed on one side of the water tank, a motor disposed above the housing, the output end of the motor passing through the housing and fixedly connected to a lead screw, and a piston plate being threadedly connected to the surface of the lead screw. By setting up the housing, motor, lead screw and piston plate, it is convenient for the operator to inject gas into the airbag according to the condensate level, so that the airbag lifts the lifting plate to a suitable height.

[0009] In one embodiment, an air pipe is connected to the lower part of the shell. The air pipe has a double-ended outlet and extends into the water tank, connecting to two air bladders. The two air bladders are respectively located on both sides below the lifting plate. With the air bladders designed as described above, not only can the lifting plate and the condensate level above it be raised, but also the symmetrically arranged air bladders on both sides can make the upward movement of the lifting plate more stable.

[0010] In one embodiment, the airbag has a flat design, and the lower part of the airbag is bonded to the lower inner part of the water tank.

[0011] In one embodiment, a limiting rod is slidably connected to the piston plate, and both ends of the limiting rod are fixedly connected to the inner wall of the housing. By setting the limiting rod, the piston plate can move vertically while maintaining a specified angle.

[0012] In one embodiment, a guide shell is provided in the flow tube bundle area of ​​the boiler body, and guide grooves are provided on both sides below the guide shell. A guide pipe is connected to the bottom of the guide groove, and the ends of the two guide pipes are connected to the water inlet pipe. By providing the guide shell, guide groove and guide pipe, condensate can be guided and discharged.

[0013] In one embodiment, vertical rods are provided on both inner sides of the water tank. The vertical rods are inserted into the lifting plate. By providing the vertical rods, the lifting plate can be limited, making it more stable when it moves vertically.

[0014] Beneficial effects

[0015] 1. By using the height difference between the inlet and outlet pipes in the water seal assembly, the pressure inside the water tank can be greater than the flue gas pressure inside the guide pipe, which can effectively prevent flue gas from overflowing through the guide pipe. At the same time, condensate can be continuously discharged, preventing the accumulation of condensate from affecting heat exchange efficiency, causing pipe wall corrosion and local thermal stress concentration.

[0016] 2. By setting up a lifting plate, motor, lead screw, piston and air bladder, when there is less condensate in the early stage, the inflated air bladder can replace part of the water volume, so that the liquid level is always higher than the port of the water inlet pipe, preventing the leakage of flue gas in the early stage. Attached Figure Description

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

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a partial structural schematic diagram of the present invention;

[0020] Figure 3 This is a schematic diagram of the water seal assembly of this utility model;

[0021] Figure 4 For the present utility model Figure 3 A magnified schematic diagram of the structure at point A in the middle.

[0022] Figure label:

[0023] 1. Base; 2. Boiler body; 3. Guide shell; 4. Flow guide pipe; 5. Water seal assembly; 501. Water tank; 502. Water inlet pipe; 503. Air bladder; 504. Lifting plate; 505. Vertical rod; 506. Shell; 507. Motor; 508. Lead screw; 509. Piston plate; 510. Limiting rod; 6. Guide groove. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this specification are for illustrative purposes only and do not represent the only possible implementation.

[0026] Furthermore, the terms "first" and "second" 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, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0027] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is 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 can mean that the first feature is 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.

[0028] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this specification belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0029] The following is combined with Figures 1-4 This invention describes a high-efficiency drainage device for the convection tube bundle area of ​​a steam boiler.

[0030] In one embodiment, a high-efficiency drainage device for the convection tube bundle area of ​​a steam boiler includes: a base 1 and a boiler body 2 disposed above it;

[0031] Water seal assembly 5 is located on the lower front side of boiler body 2;

[0032] like Figure 1 , Figure 2 and Figure 3As shown, the water seal assembly 5 includes a water tank 501 located on the front side of the boiler body 2. An inlet pipe 502 and an outlet pipe are respectively connected to the rear and upper front sides of the water tank 501. The inlet pipe 502 extends into the lower inner part of the water tank 501, and the outlet pipe is higher than the inlet pipe 502. A lifting plate 504 is vertically slidably connected within the water tank 501. A guide shell 3 is provided in the flow tube bundle area of ​​the boiler body 2. Guide grooves 6 are provided on both sides below the guide shell 3. A guide pipe 4 is connected below the guide grooves 6, and the ends of both guide pipes 4 are connected to the inlet pipe 502. Vertical rods 505 are provided on both inner sides of the water tank 501, and the vertical rods 505 are inserted into the lifting plate 504.

[0033] Firstly, the guide shell 3 and guide groove 6 guide the condensate through the guide pipe 4 to the water tank 501. As the condensate accumulates, the condensate level will be higher than the inlet pipe 502 port, forming a water seal effect on the inlet pipe 502 and the guide pipe 4. Since the flue gas is in a fluid state, and the pressure in the water tank 501 is greater than the pressure in the guide pipe 4 and the inlet pipe 502, the flue gas cannot leak out through the guide pipe 4 and the inlet pipe 502. At the same time, the condensate continuously enters the guide pipe 4 through its own gravity and the slope of the guide groove 6, which can effectively prevent the flue gas from overflowing through the guide pipe 4. When the condensate level in the water tank 501 reaches the height of the outlet pipe, the condensate will be discharged from the outlet pipe, which can prevent the accumulation of condensate from affecting the heat exchange efficiency, causing pipe wall corrosion and local thermal stress concentration.

[0034] like Figure 3 and Figure 4 As shown, the water seal assembly 5 also includes a housing 506 disposed on one side of the water tank 501. A motor 507 is disposed on the upper part of the housing 506. The output end of the motor 507 passes through the housing 506 and is fixedly connected to a lead screw 508. A piston plate 509 is threadedly connected to the surface of the lead screw 508. An air pipe is connected to the lower part of the housing 506. The air outlet of the air pipe is a double-ended design. The air outlet of the air pipe passes through the water tank 501 and is connected to two airbags 503. The two airbags 503 are respectively disposed on both sides below the lifting plate 504. The airbags 503 are flat and are bonded to the lower part of the water tank 501. A limit rod 510 is slidably connected in the piston plate 509. Both ends of the limit rod 510 are fixedly connected to the inner wall of the housing 506.

[0035] It should be noted that: such as Figure 1 and Figure 2 As shown, a liquid level sensor is installed on the upper front side of the water tank 501, which can detect the liquid level of the condensate introduced into the water tank 501.

[0036] A threaded sleeve is provided in the inner center of the piston plate 509. The piston plate 509 is engaged with the lead screw 508 through the threaded sleeve. The threads inside the threaded sleeve are in close contact with the surface texture of the lead screw 508. Therefore, when the lead screw 508 drives the piston plate 509 to move down and compress the gas, there will be no gas leakage and the gas pressure of the airbag 503 will be unstable.

[0037] First, the condensate is guided to the water tank 501 through the guide pipe 4. The personnel can know the water level height through the liquid level sensor inside the water tank 501. If there is less condensate in the early stage, the output end of the motor 507 will drive the piston plate 509 to move down through the lead screw 508. At this time, the piston plate 509 will inject the gas inside the housing 506 into the two air bags 503 through the air pipe. At this time, the two air bags 503 will rise synchronously and raise the height of the lifting plate 504. At this time, the water level of the condensate will be raised and higher than the end of the water inlet pipe 502. The guide pipe 4 and the water inlet pipe 502 will form a watertight effect. In this way, the pressure inside the water tank 501 is greater than the pressure inside the guide pipe 4 and the water inlet pipe 502, and the flue gas in the guide groove 6 cannot escape through the guide pipe 4.

[0038] The working principle of boiler body 2 is to use fuel combustion or electric energy to heat water in the furnace, boiler drum or convection tube bundle to absorb heat and vaporize it, generating high-temperature and high-pressure steam for users. The high-temperature flue gas generated by combustion flows through the radiant heating surface and the convection heating surface in sequence, gradually releasing heat and then being discharged from the chimney. During the heat exchange process, the flue gas temperature gradually decreases. When it comes into contact with the low-temperature heating surface, the water vapor in the flue gas condenses into liquid water as the temperature drops below the dew point. This condensate will combine with the acidic gases in the flue gas to form a corrosive liquid, which is usually discharged through the drain device in the flue at the tail of the boiler.

[0039] It should be noted that the airbag 503 is made of fluororubber, which has certain anti-corrosion and high temperature resistance, and can be used in the water tank 501 for a long time. Furthermore, the surfaces of the lifting plate 504 and the vertical rod 505 are coated with epoxy resin, which has strong acid and alkali resistance and can effectively prevent corrosive media in the condensate from affecting the airbag 503, the lifting plate 504 and the vertical rod 505.

[0040] Working principle: In actual use, the guide shell 3 and guide groove 6 first guide the condensate through the guide pipe 4 to the water tank 501. At the same time, personnel can know the water level through the liquid level sensor inside the water tank 501. If the condensate is low in the early stage, the output end of the motor 507 will drive the piston plate 509 to move down through the lead screw 508. At this time, the piston plate 509 will inject the gas inside the shell 506 into the two air bags 503 through the air pipe. Then, the two air bags 503 will rise synchronously, raising the height of the lifting plate 504. At this time, the water level of the condensate will be raised above the inlet pipe 502. At the end, the guide pipe 4 and the inlet pipe 502 will form a watertight effect. In this way, the pressure in the water tank 501 is greater than the pressure in the guide pipe 4 and the inlet pipe 502. The flue gas in the guide groove 6 cannot be leaked out through the guide pipe 4, while the condensate continuously enters the guide pipe 4 by its own gravity and the slope of the guide groove 6. This can effectively prevent the flue gas from overflowing through the guide pipe 4. When the liquid level of the condensate in the water tank 501 reaches the height of the outlet pipe, the condensate will be discharged out through the outlet pipe. This can prevent the accumulation of condensate from affecting the heat exchange efficiency, causing pipe wall corrosion and local thermal stress concentration.

[0041] It should be noted that the boiler body 2, motor 507, air bag 503, lead screw 508 and piston plate 509 mentioned above are all components with relatively mature existing technology. The specific model can be selected according to actual needs. At the same time, the power supply of motor 507 is a built-in power supply, which will not be described in detail here.

[0042] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0043] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. A high-efficiency drainage device for the convection tube bundle area of ​​a steam boiler, characterized in that, include: The base (1) and the boiler body (2) disposed above it; Water seal assembly (5), the water seal assembly (5) is disposed below the front side of the boiler body (2); The water seal assembly (5) includes a water tank (501) located on the front side of the boiler body (2). The water tank (501) is connected to an inlet pipe (502) on the rear side and an outlet pipe on the front side above the rear side. The inlet pipe (502) extends into the lower inner part of the water tank (501). The outlet pipe is higher than the inlet pipe (502). A lifting plate (504) is vertically slidably connected in the water tank (501).

2. The high-efficiency drainage device for the convection tube bundle area of ​​a steam boiler according to claim 1, characterized in that, The water seal assembly (5) also includes a housing (506) disposed on one side of the water tank (501). A motor (507) is disposed on the top of the housing (506). The output end of the motor (507) passes through the housing (506) and is fixedly connected to a lead screw (508). A piston plate (509) is threadedly connected to the surface of the lead screw (508).

3. The high-efficiency drainage device for the convection tube bundle area of ​​a steam boiler according to claim 2, characterized in that, The lower part of the housing (506) is connected to an air pipe. The air outlet of the air pipe is a double-ended design. The air outlet of the air pipe passes through the water tank (501) and is connected to two air bags (503). The two air bags (503) are respectively located on both sides below the lifting plate (504).

4. The high-efficiency drainage device for the convection tube bundle area of ​​a steam boiler according to claim 3, characterized in that, The airbag (503) has a flat design, and the lower part of the airbag (503) is bonded to the lower inner part of the water tank (501).

5. The high-efficiency drainage device for the convection tube bundle area of ​​a steam boiler according to claim 2, characterized in that, A limiting rod (510) is slidably connected in the piston plate (509), and both ends of the limiting rod (510) are fixedly connected to the inner wall of the housing (506).

6. The high-efficiency drainage device for the convection tube bundle area of ​​a steam boiler according to claim 1, characterized in that, A guide shell (3) is provided in the flow tube bundle area of ​​the boiler body (2). Guide grooves (6) are provided on both sides below the guide shell (3). A guide pipe (4) is connected to the bottom of the guide groove (6). The ends of the two guide pipes (4) are connected to the water inlet pipe (502).

7. The high-efficiency drainage device for the convection tube bundle area of ​​a steam boiler according to claim 1, characterized in that, The water tank (501) is provided with vertical rods (505) on both inner sides, and the vertical rods (505) are inserted into the lifting plate (504).

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