Novel water wall tube

Abstract

The invention provides a novel water cooling wall tube which comprises a water cooling wall body, the water cooling wall body is composed of a boiler barrel and a water cooling tube, and the two ends of the boiler barrel are detachably connected with the water cooling tube in a bolt mode. According to the implementation mode, a continuous and stable protection layer is formed on the outer wall of the water-cooled pipe through the unit anti-abrasion protection tiles and the connecting protection tiles, so that scouring and abrasion of particles flowing at a high speed in flue gas to the wall of the water-cooled pipe can be effectively reduced, and the high-temperature flue gas can be kept for a relatively stable retention time when flowing through the outer surface of the water-cooled pipe; therefore, the heat exchange condition between the flue gas and the pipe wall is enhanced; meanwhile, part of smoke is guided into the branch heat exchange pipes, additional heat exchange paths are formed in the branch pipes, the double heating effect on the exterior and the interior of a water body in the water cooling pipe is achieved, the total heat exchange contact area is increased, the heat conduction efficiency is improved, and the overall heat exchange performance is further optimized.

Description

Technical Field

[0001] This invention relates to the field of boiler water-cooled wall tube technology, and in particular to a novel water-cooled wall tube. Background Technology

[0002] Currently, water-cooled wall tube assemblies widely used in power plant boilers are mainly composed of multiple parallel carbon steel or alloy steel tubes. These tubes are typically arranged densely along the inner wall of the furnace in a vertical or inclined manner and are firmly fixed to the furnace wall by welding or mechanical connections. As a key component of the boiler's evaporation system, the water-cooled wall not only effectively absorbs the radiant heat carried by the high-temperature flue gas but also protects the furnace wall structure and reduces the load on refractory materials. During operation, the working fluid, water, flows inside the tubes and gradually evaporates upon heating, converting into steam with a certain pressure and temperature, which then drives the turbine generator unit, achieving energy conversion.

[0003] Existing water-cooled wall tubes are made of circular steel pipes, connected to the boiler drum to form the entire water-cooling system. These tubes are arranged parallel and vertically on the outer side of the boiler wall. However, when flue gas passes through the gaps between adjacent sets of tubes, the contact time between the flue gas and the tubes is brief, resulting in low heat exchange efficiency and insufficient heat transfer from the flue gas to the working fluid (water) inside the tubes. Furthermore, the smooth surface of the circular tubes easily forms a turbulent boundary layer during flue gas flow, further reducing heat transfer efficiency, causing an increase in exhaust gas temperature, and a decrease in the overall thermal efficiency of the boiler. Therefore, a novel water-cooled wall tube is proposed. Summary of the Invention

[0004] The summary section of this invention provides a brief overview of the concepts, which will be described in detail in the detailed description section that follows. This summary section is not intended to identify key or essential features of the claimed technical solutions, nor is it intended to limit the scope of the claimed technical solutions.

[0005] This invention provides a novel water-cooled wall tube to solve the technical problems mentioned in the background section above.

[0006] The novel water-cooled wall tube of the present invention includes a water-cooled wall body, which is composed of a boiler drum and a water-cooled tube. The two ends of the boiler drum are detachably connected to the water-cooled tube by bolts. The outer wall of the water-cooled pipe is equidistantly fitted with unit anti-wear protective tiles along its length. Between two adjacent sets of unit anti-wear protective tiles, there is a connecting protective tile fixed to the outer wall of the water-cooled pipe. The connecting protective tile and the unit anti-wear protective tiles form a protective component on the outer wall of the water-cooled pipe. A branch heat exchange pipe is fitted inside the water-cooled pipe at a position corresponding to each set of unit anti-wear protective tiles. The branch heat exchange pipe can transport the flue gas inside the unit anti-wear protective tiles through the water-cooled pipe to the rear.

[0007] Optionally, the water-cooled pipe is composed of two sets of arc-shaped half-pipes spliced ​​together, and the two sets of arc-shaped half-pipes are provided with inner lining strips and inner lining grooves at the abutting positions.

[0008] Optionally, the protective assembly consisting of the unit anti-wear protective tile and the connecting protective tile is fixed to the windward position of the outer wall of the water-cooled pipe.

[0009] Optionally, each set of the unit wear-resistant protective tiles includes multiple sets of radial plates equidistantly distributed on the outer wall of the water-cooling pipe. The outer wall of the multiple sets of radial plates is provided with several sets of arc-shaped strips along its length direction. The arc-shaped strips and the radial plates form several unit spaces.

[0010] Optionally, the width of the radial plate increases from the center to the edge, and the radial plate forms a concave shape.

[0011] Optionally, the branch heat exchange tube includes multiple sets of unit tubes distributed along the axis of the water-cooled tube, and the multiple sets of unit tubes are spirally distributed inside the water-cooled tube.

[0012] Optionally, the unit tube includes a U-shaped tube inside the water-cooling tube, the outer wall of the U-shaped tube is connected to an input tube extending into the unit space, and the outer wall of the water-cooling tube away from the unit wear-resistant protective tile is connected to a discharge pipe, and the end of the discharge pipe is connected to the U-shaped tube.

[0013] Optionally, the number of boiler drums is two sets, which are distributed at both ends of the water-cooling pipes, and the water-cooling pipes are distributed along the axial direction of the boiler drums.

[0014] Optionally, flanges are fixed to both ends of the outer wall of the water-cooled pipe, and docking sleeves are fixed to the positions where the outer wall of the water-cooled pipe connects with each group of water-cooled pipes. The flanges are fixed to the docking sleeves with bolts.

[0015] Optionally, clearance holes are provided at the positions where the water-cooled pipe contacts the discharge pipe and the input pipe.

[0016] The above embodiments of the present invention have the following beneficial effects: the unit anti-wear protective tiles and connecting protective tiles form a continuous and stable protective layer on the outer wall of the water-cooled pipe, which can not only effectively reduce the scouring and wear caused by high-speed flowing particles in the flue gas on the water-cooled pipe wall, but also allow the high-temperature flue gas to maintain a relatively stable residence time when flowing through the outer surface of the water-cooled pipe, thereby enhancing the heat exchange conditions between the flue gas and the pipe wall; at the same time, some flue gas is guided into the branch heat exchange pipe, forming an additional heat exchange path in the branch pipe, realizing the dual heating effect of the water inside the water-cooled pipe from the outside and inside, increasing the total heat exchange contact area, improving the heat conduction efficiency, and further optimizing the overall heat exchange performance. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. 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 one embodiment of the novel water-cooled wall tube of the present invention; Figure 2 This is a three-dimensional structural schematic diagram of an embodiment of the water-cooled pipe of the present invention; Figure 3 This is a schematic diagram of the unfolded structure of an embodiment of the water-cooled pipe of the present invention; Figure 4 This is a schematic diagram of the structure of one embodiment of the unit abrasion-resistant protective tile of the present invention; Figure 5 This is a schematic diagram of the structure of one embodiment of the unit wear-resistant protective tile and unit tube of the present invention; Figure 6 This is a schematic diagram of one embodiment of the unit tube and branch heat exchange tube of the present invention.

[0019] Explanation of reference numerals in the attached figures: 100. Water-cooled wall body; 110. Boiler drum; 120. Water-cooled tube; 121. Arc-shaped half-tube; 122. Leaving opening; 130. Unit anti-wear protective tile; 131. Radial plate; 132. Arc-shaped strip; 133. Unit space; 140. Flange; 150. Connecting cylinder seat; 160. Branch heat exchange tube; 161. Unit tube; 162. U-shaped tube; 163. Discharge pipe; 164. Inlet pipe; 170. Connecting protective tile. Detailed Implementation

[0020] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, 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," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the referred or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0022] 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 one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] Please see Figures 1 to 6 The novel water-cooled wall tube of the present invention includes a water-cooled wall body 100, which is composed of a boiler drum 110 and a water-cooled pipe 120. The two ends of the boiler drum 110 are detachably connected to the water-cooled pipe 120 by bolts.

[0025] The outer wall of the water-cooled pipe 120 is equidistantly fitted with unit anti-wear protective tiles 130 along its length. Between two adjacent sets of unit anti-wear protective tiles 130, there is a connecting protective tile 170 fixed to the outer wall of the water-cooled pipe 120. The connecting protective tile 170 and the unit anti-wear protective tiles 130 form a protective component on the outer wall of the water-cooled pipe 120. A branch heat exchange pipe 160 is fitted inside the water-cooled pipe 120 at a position corresponding to each set of unit anti-wear protective tiles 130. The branch heat exchange pipe 160 can transport the flue gas inside the unit anti-wear protective tiles 130 through the water-cooled pipe 120 to the rear.

[0026] The protective assembly consisting of the unit anti-wear protective tile 130 and the connecting protective tile 170 is fixed to the windward position of the outer wall of the water cooling pipe 120.

[0027] Each unit of wear-resistant protective tile 130 includes multiple sets of radial plates 131 equidistantly distributed on the outer wall of the water-cooling pipe 120. The outer wall of the multiple sets of radial plates 131 is provided with several sets of arc-shaped strips 132 along its length direction. The arc-shaped strips 132 and the radial plates 131 form several unit spaces 133.

[0028] The width of the radial plate 131 increases from the center to the edge, and the radial plate 131 forms a concave shape.

[0029] The branch heat exchange tube 160 includes multiple sets of unit tubes 161 distributed along the axial direction of the water-cooled tube 120, and the multiple sets of unit tubes 161 are spirally distributed inside the water-cooled tube 120.

[0030] The unit pipe 161 includes a U-shaped pipe 162 inside the water cooling pipe 120. The outer wall of the U-shaped pipe 162 is connected to an input pipe 164 extending into the unit space 133. The outer wall of the water cooling pipe 120 away from the unit wear-resistant protective tile 130 is connected to an exhaust pipe 163, and the end of the exhaust pipe 163 is connected to the U-shaped pipe 162.

[0031] The water cooling pipe 120 is provided with clearance holes 122 at the positions where it contacts the discharge pipe 163 and the input pipe 164.

[0032] It is worth noting that the unit anti-wear protective tile 130 and the connecting protective tile 170 (also known as anti-wear plate) form a protective structure in the windward area of ​​the outer wall of the water-cooled pipe 120 to reduce the impact and wear of particles in the flue gas on the water-cooled pipe 120, thereby extending its service life. When the flue gas flows towards the water-cooled pipe 120, some of the flue gas comes into contact with the connecting protective tile 170 and is guided to one side, so that it flows through the gap between the two sets of water-cooled pipes 120. Another part of the flue gas comes into contact with the unit anti-wear protective tile 130 and then enters the unit space 133. Due to the concave shape design of the radial plate 131, the flue gas forms turbulence in the unit space 133, which prolongs the contact time with the pipe wall. At the same time, the high-temperature flue gas is drawn into the branch heat exchange pipe 160 through the input pipe 164, and the flue gas in the unit space 133 will slowly overflow to the edge and eventually flow through both sides of the water-cooled pipe 120. Since the branch heat exchange pipe 160 will always guide the flue gas into the water pipe 120, the unit space 133 will always maintain the state of flue gas retention, so that the flue gas in the unit space 133 will continuously heat the outer wall of the water-cooled pipe 120 (exchange heat with the water inside).

[0033] The high-temperature flue gas in unit space 133 enters the U-shaped tube 162 through input pipe 164. During the flow process in the spirally distributed unit tube 161, it fully exchanges heat with the carrier (water) in the main water-cooled tube 120. After the heat exchange is completed, the low-temperature flue gas is finally discharged from the leeward side of the water-cooled tube 120 through discharge pipe 163. During this process, the combined structure of radial plate 131 and arc strip 132 of unit wear-resistant protective tile 130 not only enhances the flue gas turbulence effect, but its concave shape also increases the heat exchange area and makes the flue gas stay on the surface of the water-cooled tube 120 for a longer time. The spiral unit tube 161 extends the residence path of the flue gas in the tube, so that the waste heat of the flue gas is absorbed in a stepwise manner.

[0034] The clearance hole 122 on the water-cooled pipe 120 ensures a sealed connection between the inlet pipe 164 and the outlet pipe 163. Meanwhile, the two sets of boiler drums 110 are located at both ends of the water-cooled pipe 120, forming a closed circulation system, which ultimately achieves dual absorption of flue gas heat in the unit space 133 and the branch heat exchange pipe 160, thereby improving the overall heat exchange efficiency.

[0035] Please refer to this carefully. Figure 3 and Figure 4 The water-cooled pipe 120 is composed of two sets of arc-shaped half-pipes 121 spliced ​​together, and the two sets of arc-shaped half-pipes 121 are provided with inner lining strips and inner lining grooves at the abutting positions.

[0036] Before assembling the arc-shaped half-tube 121, the components of the branch heat exchange tube 160, such as the unit tube 161, the U-shaped tube 162, the inlet tube 164, and the outlet tube 163, are positioned and fixed in a predetermined position on the inner wall of one set of arc-shaped half-tubes 121. Then, another set of arc-shaped half-tubes 121 is joined and spliced ​​with it, and the sealing is ensured by the fitting of the inner lining strip and the inner lining groove.

[0037] There are two sets of boiler drums 110, which are distributed at both ends of the water cooling pipes 120. The water cooling pipes 120 are distributed along the axial direction of the boiler drums 110.

[0038] Please refer to this carefully. Figure 2 Flanges 140 are fixed to both ends of the outer wall of the water-cooled pipe 120. A docking sleeve seat 150 is fixed to the outer wall of the water-cooled pipe 120 at the joint position with each group of water-cooled pipes 120. The flanges 140 are fixed to the docking sleeve seat 150 with bolts.

[0039] The bolted connection structure between flange 140 and docking sleeve 150 facilitates quick disassembly during maintenance and makes it easy to disassemble and assemble water-cooled pipe 120 later.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A novel water-cooled wall tube, characterized in that, It includes a water-cooled wall body, which is composed of a boiler drum and water-cooled pipes. The two ends of the boiler drum are detachably connected to the water-cooled pipes by bolts. The outer wall of the water-cooled pipe is equidistantly fitted with unit anti-wear protective tiles along its length. Between two adjacent sets of unit anti-wear protective tiles, there is a connecting protective tile fixed to the outer wall of the water-cooled pipe. The connecting protective tile and the unit anti-wear protective tiles form a protective component on the outer wall of the water-cooled pipe. A branch heat exchange pipe is fitted inside the water-cooled pipe at a position corresponding to each set of unit anti-wear protective tiles. The branch heat exchange pipe can transport the flue gas inside the unit anti-wear protective tiles through the water-cooled pipe to the rear.

2. The novel water-cooled wall tube according to claim 1, characterized in that, The water-cooled pipe is composed of two sets of arc-shaped half-pipes spliced ​​together, and the two sets of arc-shaped half-pipes are provided with inner lining strips and inner lining grooves at the abutting positions.

3. The novel water-cooled wall tube according to claim 1, characterized in that, The protective assembly, consisting of the unit anti-wear protective tile and the connecting protective tile, is fixed to the windward position on the outer wall of the water-cooled pipe.

4. The novel water-cooled wall tube according to claim 1, characterized in that, Each group of the unit wear-resistant protective tiles includes multiple groups of radial plates evenly distributed on the outer wall of the water-cooling pipe. The outer wall of the multiple groups of radial plates is provided with several groups of arc-shaped strips along its length direction. The arc-shaped strips and the radial plates form several unit spaces.

5. The novel water-cooled wall tube according to claim 4, characterized in that, The width of the radial plate increases from the center to the edge, and the radial plate forms a concave shape.

6. The novel water-cooled wall tube according to claim 4, characterized in that, The branch heat exchange tube includes multiple sets of unit tubes distributed along the axis of the water-cooled tube, and the multiple sets of unit tubes are spirally distributed inside the water-cooled tube.

7. The novel water-cooled wall tube according to claim 6, characterized in that, The unit tube includes a U-shaped tube inside the water-cooling tube. The outer wall of the U-shaped tube is connected to an input tube extending into the unit space. The outer wall of the water-cooling tube away from the unit's wear-resistant protective tile is connected to a discharge pipe, and the end of the discharge pipe is connected to the U-shaped tube.

8. The novel water-cooled wall tube according to claim 1, characterized in that, The boiler drum consists of two sets, distributed at both ends of the water-cooling pipes, which are distributed along the axial direction of the boiler drum.

9. The novel water-cooled wall tube according to claim 1, characterized in that, Flanges are fixed to both ends of the outer wall of the water-cooled pipe. A docking sleeve is fixed to the position where the outer wall of the water-cooled pipe connects with each group of water-cooled pipes. The flanges are fixed to the docking sleeves with bolts.

10. The novel water-cooled wall tube according to claim 1, characterized in that, The water-cooled pipe is provided with clearance holes at the positions where it contacts the discharge pipe and the input pipe.

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