Boiler pre-evaporator capable of reducing incrustation scale

Abstract

The utility model relates to a boiler pre-evaporator capable of reducing scale, which comprises a heat exchange tube assembly, the heat exchange tube assembly is provided with an air tube and a steam tube which penetrate through the heat exchange tube assembly, a driving assembly and an annular scraper blade are arranged in the output end of the steam tube, the driving assembly comprises a driving motor and a guide rod, the driving motor is connected with a driving screw rod, and the guide rod is connected with the driving screw rod. The edge of the annular scraping plate is attached to the inner wall of the steam pipe, a through hole is formed in the middle of the annular scraping plate, the annular scraping plate is provided with a guide hole and a threaded hole which allow the guide rod and the driving screw to penetrate through and are matched, and the axis of the guide rod and the axis of the driving screw are both matched with the output end of the steam pipe; the driving motor is in linkage with the driving screw and the thread to drive the annular scraper to reciprocate along the steam pipe, water drops on the pipe wall are pushed to gather to form water flow, condensate water flows out of the steam pipe and enters the drain tank quickly, the condensate water is prevented from generating a large amount of scale on the pipe wall, the service life of a pipeline is prolonged, and the condensate water is prevented from being hindered by the scale when flowing along the pipe wall.

Description

Technical Field

[0001] The present invention relates to the technical field of boiler pre-steamers, and in particular to a boiler pre-steamer capable of reducing scale. Background Art

[0002] In a thermal power plant system using a boiler, a portion of the steam generated by the boiler drum passes through a preheater to heat the air entering the boiler, increasing the boiler inlet air temperature and thus reducing energy consumption. Existing steam preheaters use serpentine heat exchange tubes that work in conjunction with air and steam pipes to heat the air. However, at the output end of the steam pipe, the steam cools down after heat exchange, forming condensed water droplets on the pipe wall. These water droplets then gather and flow out of the steam pipe into the drain tank. However, the condensed water needs to flow slowly down the water pipe, converge at the bottom of the pipe to form a stream, and then flow along the pipe into the drain tank. During this process, the condensed water will form a large amount of scale on the pipe wall, affecting the life of the pipe and the flow of condensed water. Therefore, designing a boiler preheater that can quickly discharge steam condensate and reduce scale has become a technical problem that urgently needs to be solved. Summary of the Invention

[0003] In order to solve the above problems, the present invention provides a boiler preheater capable of reducing scale.

[0004] The technical solution of the present utility model is a boiler preheater capable of reducing scale, comprising a heat exchange tube assembly, wherein the heat exchange tube assembly is provided with an air tube and a steam tube passing therethrough, a drive assembly and an annular scraper are provided in the output end of the steam tube, the drive assembly comprises a drive motor and a guide rod, the drive motor is connected to a drive screw, the edge of the annular scraper is in contact with the inner wall of the steam tube, a through hole is provided in the middle, the annular scraper is provided with a guide hole and a threaded hole for the guide rod and the drive screw to pass through and match, and the axes of the guide rod and the drive screw are matched with the output end of the steam tube.

[0005] After adopting the above structure, heat exchange is carried out through the steam preheater. After condensed water droplets are formed on the inner wall of the output end of the steam pipe, the drive motor is started to link with the drive screw, and the drive screw rotates relative to the threaded hole. At the same time, the guide rod and the drive screw cooperate to pass through the guide hole and the threaded hole, and the axis matches the output end of the steam pipe. The thread drives the annular scraper to move back and forth along the steam pipe. The edge of the annular scraper fits with the inner wall of the steam pipe, pushing the water droplets on the pipe wall to gather to form a water flow, accelerating the flow of condensed water from the steam pipe into the drain tank, avoiding the generation of a large amount of scale on the pipe wall by the condensed water, improving the service life of the pipeline, and avoiding the condensed water being hindered by scale when flowing along the pipe wall.

[0006] As a further improvement of the present invention, the driving motor and the guide rod are both connected to the top of the steam pipe.

[0007] After adopting the above structure, the drive motor and the guide rod are connected to the top of the steam pipe. The annular scraper scrapes off the condensed water droplets and merges them into a water flow, thereby preventing the water flow from penetrating into the guide hole and the threaded hole, and affecting the coordination with the guide rod and the drive screw.

[0008] As a further improvement of the present invention, a seepage groove is provided on the outer peripheral surface of the annular scraper, and the seepage groove is connected to the front and rear sides of the annular scraper.

[0009] After adopting the above structure, the front and rear sides of the annular scraper are connected through the seepage groove, so that when the annular scraper moves in the opposite direction and resets, the water flow scraped and gathered on the other side can pass through the seepage groove and flow out of the steam pipe, avoiding being blocked by the annular scraper and difficult to flow out.

[0010] As a further improvement of the present invention, a raised partition block is provided at the bottom of the steam pipe, a movable spacer matching the annular scraper is provided between the partition block and the output end of the steam pipe, and a flow-blocking slope is provided on the side of the partition block facing the drain tank.

[0011] After adopting the above structure, by setting the movable interval, the annular scraper will not be blocked by the partition block when it moves; when the annular scraper pushes the condensed water to the end of the steam pipe, when the annular scraper moves in the opposite direction, the condensed water on the other side is blocked by the partition block and will not flow back to the input end of the steam pipe. After hitting the partition block, the condensed water will be decelerated along the flow-blocking slope, and then flow back to the annular scraper under the guidance of the flow-blocking slope.

[0012] As a further improvement of the present invention, the inner wall of the guide hole is provided with a ball groove, in which an auxiliary ball is embedded. One side of the auxiliary ball extends out of the ball groove and fits with the guide rod, and waterproof grease is coated between the auxiliary ball and the ball groove.

[0013] After adopting the above structure, one side of the auxiliary ball is fitted with the guide rod. When the guide rod moves along the guide hole, the auxiliary ball rotates due to friction. The auxiliary ball is embedded in the ball groove. Waterproof grease is set between the two to reduce friction during rotation, thereby reducing the friction on the guide rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Shown is a schematic structural diagram of the utility model.

[0015] Figure 2 Shown is a schematic diagram of the cross-sectional structure of a steam pipe.

[0016] Figure 3 Shown is a schematic diagram of the annular scraper structure.

[0017] 1-heat exchange tube assembly, 2-steam pipe, 3-annular scraper, 4-driving motor, 5-guide rod, 6-driving screw, 7-guide hole, 8-threaded hole, 9-seepage groove, 10-partition block, 11-blocking slope, 12-ball groove, 13-auxiliary ball. DETAILED DESCRIPTION

[0018] like Figure 1-Figure 3 A boiler preheater capable of reducing scale is shown, comprising a heat exchange tube assembly 1, wherein the heat exchange tube assembly 1 is provided with an air tube and a steam tube 2 passing therethrough, a drive assembly and an annular scraper 3 being provided in the output end of the steam tube 2, the drive assembly comprising a drive motor 4 and a guide rod 5, the drive motor 4 being connected to a drive screw 6, the edge of the annular scraper 3 being in contact with the inner wall of the steam tube 2, and a through hole being provided in the middle, the annular scraper 3 being provided with a guide hole 7 and a threaded hole 8 for the guide rod 5 and the drive screw 6 to pass through and match, and the axes of the guide rod 5 and the drive screw 6 are both matched with the output end of the steam tube 2.

[0019] After heat exchange is performed through the preheater and condensed water droplets are formed on the inner wall of the output end of the steam pipe 2, the drive motor 4 is started to link with the drive screw 6, and the drive screw 6 rotates relative to the threaded hole 8. At the same time, the guide rod 5 and the drive screw 6 cooperate to pass through the guide hole 7 and the threaded hole 8, and the axis matches the output end of the steam pipe 2. The thread drives the annular scraper 3 to move back and forth along the steam pipe 2. The edge of the annular scraper 3 fits with the inner wall of the steam pipe 2, pushing the water droplets on the pipe wall to gather to form a water flow, accelerating the flow of condensed water from the steam pipe 2 into the drain tank, avoiding the generation of a large amount of scale on the pipe wall, improving the service life of the pipeline, and avoiding the condensed water being hindered by scale when flowing along the pipe wall.

[0020] The driving motor 4 and the guide rod 5 are both connected to the top of the steam pipe 2 .

[0021] By connecting the driving motor 4 and the guide rod 5 to the top of the steam pipe 2, the annular scraper 3 scrapes off the condensed water droplets and merges them into a water flow, preventing the water flow from penetrating into the guide hole 7 and the threaded hole 8, and affecting the cooperation with the guide rod 5 and the driving screw 6.

[0022] A seepage groove 9 is provided on the outer peripheral surface of the annular scraper 3 , and the seepage groove 9 communicates with the front and rear sides of the annular scraper 3 .

[0023] By connecting the front and rear sides of the annular scraper 3 through the seepage groove 9, when the annular scraper 3 moves in the reverse direction and resets, the water flow scraped and gathered on the other side can pass through the seepage groove 9 and flow out of the steam pipe 2, avoiding being blocked by the annular scraper 3 and being difficult to flow out.

[0024] A raised partition block 10 is provided at the bottom of the steam pipe 2. A movable gap matching the annular scraper 3 is provided between the partition block 10 and the output end of the steam pipe 2. A flow-blocking slope 11 is provided on the side of the partition block 10 facing the drain tank.

[0025] By setting the movable interval, the annular scraper 3 will not be blocked by the partition block 10 when it moves; when the annular scraper 3 pushes the condensed water to the end of the steam pipe 2, when the annular scraper 3 moves in the opposite direction, the condensed water on the other side is blocked by the partition block 10 and will not flow back to the input end of the steam pipe 2. After hitting the partition block 10, the condensed water will be decelerated along the flow-blocking slope 11, and then flow back to the annular scraper 3 under the guidance of the flow-blocking slope 11.

[0026] The inner wall of the guide hole 7 is provided with a ball groove 12, in which an auxiliary ball 13 is embedded. One side of the auxiliary ball 13 extends out of the ball groove 12 and fits with the guide rod 5. Waterproof grease is coated between the auxiliary ball 13 and the ball groove 12.

[0027] By fitting one side of the auxiliary ball 13 with the guide rod 5, when the guide rod 5 moves along the guide hole 7, the auxiliary ball 13 rotates due to friction, and the auxiliary ball 13 is embedded in the ball groove 12. Waterproof grease is provided between the two to reduce friction during rotation, thereby reducing the friction exerted on the guide rod 5.

Claims

1. A boiler preheater capable of reducing scale, comprising a heat exchange tube assembly (1), wherein the heat exchange tube assembly (1) is provided with an air pipe and a steam pipe (2) passing therethrough, and characterized in that: A driving assembly and an annular scraper (3) are provided in the output end of the steam pipe (2), wherein the driving assembly comprises a driving motor (4) and a guide rod (5), wherein the driving motor (4) is connected to a driving screw (6), wherein the edge of the annular scraper (3) is in contact with the inner wall of the steam pipe (2), and a through hole is provided in the middle thereof, wherein the annular scraper (3) is provided with a guide hole (7) and a threaded hole (8) for the guide rod (5) and the driving screw (6) to pass through and match, and wherein the axes of the guide rod (5) and the driving screw (6) are both matched with the output end of the steam pipe (2).

2. The boiler preheater capable of reducing scale according to claim 1, characterized in that: The driving motor (4) and the guide rod (5) are both connected to the top of the steam pipe (2).

3. The boiler preheater capable of reducing scale according to claim 1, characterized in that: A seepage groove (9) is provided on the outer peripheral surface of the annular scraper (3), and the seepage groove (9) is connected to the front and rear sides of the annular scraper (3).

4. The boiler preheater capable of reducing scale according to claim 1, characterized in that: A raised partition block (10) is provided at the bottom of the steam pipe (2), a movable gap matching the annular scraper (3) is provided between the partition block (10) and the output end of the steam pipe (2), and a flow-blocking slope (11) is provided on the side of the partition block (10) facing the drain tank.

5. The boiler preheater capable of reducing scale according to claim 1, characterized in that: The inner wall of the guide hole (7) is provided with a ball groove (12), an auxiliary ball (13) is embedded in the ball groove (12), one side of the auxiliary ball (13) extends out of the ball groove (12) and fits with the guide rod (5), and waterproof grease is coated between the auxiliary ball (13) and the ball groove (12).

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