Jet cleaning device for fire tube of fire tube heating furnace

Abstract

The utility model provides a kind of fire tube type heating furnace fire tube's jet cleaning device, a set of device is arranged on every fire tube upper portion in furnace, including jet body, flow guide tube, sealing washer, water inlet pipe, sealing pad, support plate, support frame, pin shaft, tension spring, limit pin, utilize the liquid to be heated to flush fire tube upper surface to remove scale;When the liquid to be heated pressure is lower, a booster pump is set outside furnace, improves the jet flushing force of liquid.The utility model utilizes the jet of liquid to be heated to flush fire tube surface to remove scale, and fire tube metal is not damaged;The jet body is set into swing type, jet can sweep the entire upper surface of fire tube, and flushing effect is good;And the jet body swings by water jet reaction force, and automatically changes direction, and motor drive is not needed, and safety explosion-proof is high.

Description

Technical Field

[0001] This utility model relates to the field of descaling technology for heating furnaces, specifically a jet descaling device for fire tubes of fire tube type heating furnaces commonly used in oil fields and other industries. Background Technology

[0002] Fire-tube type heaters are horizontal heaters that heat the liquid inside the furnace through fire tubes and flue tubes. They are widely used due to their simple structure, low cost, and convenient maintenance. However, the fire tubes of fire-tube type heaters are large, and the upper surface of the fire tubes is prone to depositing impurities from the medium, resulting in scale buildup, which reduces heating efficiency and can easily cause the fire tube metal to overheat, or even lead to accidents.

[0003] Currently, some descaling devices for fire tubes of heating furnaces have been developed. Most of these devices use mechanical scraping components for descaling, which can easily lead to gradual scratching and thinning of the metal on the upper surface of the fire tube, reducing its service life. If the descaling device uses liquid jets to flush the surface of the fire tube, the descaling effect is good only in the flushed area, while the descaling effect is poor in the surrounding area. Summary of the Invention

[0004] In order to solve the technical problems mentioned in the background art, this utility model provides a jet descaling device for the fire tube of a fire tube type heating furnace, which uses liquid jet for descaling. The jet can sweep across the entire upper surface of the fire tube, and the rinsing and descaling effect is good.

[0005] The technical solution of this utility model is: a jet descaling device is arranged on the upper part of each fire tube in the furnace, including a water inlet pipe, a guide tube, a jetting fluid, a support plate, a support frame, and a pin shaft, and the scale is removed by flushing the upper surface of the fire tube with the liquid to be heated. The water inlet pipe delivers the liquid to be heated, is introduced from outside the furnace and welded to the furnace shell for sealing; the inner end of the water inlet pipe is provided with a flange face and is connected to the guide tube by bolts. The guide tube is configured as a cylindrical shape with one end closed and the other end thickened. Threaded blind holes are machined on both end faces for mounting bolts. The outer non-thickened cylindrical surface of the guide tube is precision machined into a sliding surface, and two water outlet holes are machined laterally in the blind hole on the inner side. The included angle L of the axes of the two water outlet holes is set to a range of 110°~120°. The jetting fluid is assembled and welded from a sliding sleeve, two short connectors, two long branch pipes, several water spray pipes, and a blocking plate. The inner hole of the sliding sleeve is precision machined to fit the sliding surface of the guide tube with a clearance fit. The two short connectors are laterally welded to both sides of the sliding sleeve. One end of the long branch pipe is sealed and its side is welded to the short connector. Several water spray pipes are welded to the bottom of the long branch pipe. The other end of the long branch pipe is welded to the blocking plate for sealing. The hole in the middle of the blocking plate has a clearance fit with the pin. The lower part of the support plate is welded to the upper surface of the front part of the fire tube of the heating furnace, and the upper part is connected by bolts to support the blind end of the guide tube; the lower part of the support frame is welded to the upper surface of the rear part of the fire tube, and a pin hole is machined on the upper part to be interference fit with the pin; when the support plate and the support frame are installed, the guide tube is coaxial with the pin hole to ensure that the jet can swing freely.

[0006] Furthermore, to prevent the jet from oscillating and remaining in the middle position, an upper lifting lug is welded to the upper part of the plug plate of the jet, and a lower lifting lug is welded to the outside of the support frame. A tension spring is connected between the upper and lower lifting lugs. When the jet oscillates through the middle position, the tension spring is stretched to its maximum, thereby preventing the jet from remaining in the middle position.

[0007] Furthermore, to prevent excessive oscillation of the jet fluid, a limiting plate is welded to the lower part of the plug plate of the jet fluid, and a hole is drilled in the limiting plate to fit a limiting pin with an interference fit; an arc-shaped notch is machined at the lower part of the support frame corresponding to the position of the limiting pin, the included angle of the arc of the notch is set to be the same as the included angle L of the axes of the two water outlets of the guide tube, and the width of the arc-shaped notch is greater than the diameter of the limiting pin; one end of the limiting pin is inserted into the hole of the limiting plate, and the other end is inserted into the arc-shaped notch of the support frame; when the jet fluid oscillates to one side until the limiting pin reaches one end of the arc-shaped notch, one of the water outlets of the guide tube is aligned with one of the short-circuit inner holes of the jet fluid.

[0008] Furthermore, for sealing purposes, two annular grooves are machined on the sliding surfaces on both sides of the water outlet of the guide tube, and two sealing rings are installed in the annular grooves; a sealing gasket is provided at the connection surface between the water inlet pipe and the guide tube.

[0009] Furthermore, in order to reduce the oscillation resistance of the jet, the guide tube and the pin are made of copper alloy.

[0010] Furthermore, when the pressure of the liquid to be heated is low, a booster pump is installed outside the furnace to increase the jetting force of the liquid.

[0011] This invention has the following advantages: First, the device uses a jet of the liquid to be heated to flush the surface of the fire tube for descaling without damaging the metal of the fire tube; second, the jet is set to an oscillating motion, which can sweep across the entire upper surface of the fire tube, resulting in good flushing and descaling effect; finally, the jet inside the furnace oscillates by the reaction force of the water spray and automatically changes direction, without the need for a motor drive, thus ensuring high safety and explosion-proof performance.

[0012] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the present invention.

[0013] Other features and aspects of the present invention will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0014] Figure 1 This is a front view of the jet descaling device; Figure 2 For the jet descaling device Figure 1 Top view of section AA in the middle; Figure 3 For the jet descaling device Figure 1 A cross-sectional left view of the jet fluid oscillating through the middle position in the BB section; Figure 4 For the jet descaling device Figure 1 A cross-sectional left view of the jet fluid swinging to one side in the middle BB section; Figure 5 Right view of the jet descaling device when the jet fluid is swung to one side; Figure 6 A perspective view of the jet fluid in the jet descaling device; Figure 7 A cross-sectional front view of the guide tube of the jet descaling device; Figure 8 The guide tube of the jet descaling device Figure 7 Left view of the cross section CC; Figure 9 A perspective view of the support frame of the jet descaling device; Figure 10 A cross-sectional front view of the jet descaling device installed in a heating furnace; Figure 11 The jet descaling device is installed in the heating furnace. Figure 10 Top view of the DD section in the middle; Figure 12 The jet descaling device is installed in the heating furnace. Figure 10 Left sectional view of the EE section.

[0015] In the diagram: 1-Jet fluid, 101-Sliding sleeve, 102-Short connector, 103-Long branch pipe, 104-Water spray pipe, 105-Blocking plate, 106-Upper lifting lug, 107-Limiting plate; 2-Guide tube, 201-Sliding surface, 202-Water outlet, 203-Threaded blind hole, 204-Annular groove; 3-Sealing ring; 4-Water inlet pipe; 5-Sealing gasket; 6-Support plate; 7-Support frame, 701-Pin hole, 702-Arc-shaped notch, 703-Lower lifting lug; 8-Pin; 9-Tension spring; 10-Limiting pin; 11-Furnace shell; 12-Fire tube. Detailed Implementation

[0016] The various exemplary embodiments, features, and methods of use of this utility model will be described in detail below with reference to the accompanying drawings. The same reference numerals in the drawings denote elements with the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0017] Furthermore, to better illustrate this utility model, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this utility model can be implemented without certain specific details. In some instances, methods, means, and elements well-known to those skilled in the art have not been described in detail in order to highlight the main points of this utility model.

[0018] like Figures 1-12 As shown, a jet descaling device is arranged on the upper part of each fire tube 12 in the furnace, including jet 1, guide tube 2, sealing ring 3, water inlet pipe 4, sealing gasket 5, support plate 6, support frame 7, pin 8, tension spring 9, and limit pin 10. The scale is removed by flushing the upper surface of the fire tube 12 with the liquid to be heated.

[0019] like Figure 1 and Figure 2 As shown, the water inlet pipe 4 transports the liquid to be heated, is introduced from outside the furnace and welded and sealed to the furnace shell 11; the inner end of the water inlet pipe 4 is provided as a flange face, which is connected to the guide cylinder 2 by bolts; the sealing gasket 5 is provided at the connection surface between the water inlet pipe 4 and the guide cylinder 2.

[0020] like Figure 7 and Figure 8 As shown, the guide tube 2 is made of copper alloy and is shaped as a cylinder with one end closed and the other end thickened. Threaded blind holes 203 are machined on both end faces for mounting bolts. The outer non-thickened cylindrical surface of the guide tube 2 is precision machined into a sliding surface 201, and two water outlet holes 202 are machined laterally in the blind hole on the inner side. The included angle L of the axes of the two water outlet holes 202 is set to a range of 110°~120°. Two annular grooves 204 are machined on the sliding surface 201 on both sides of the water outlet holes 202 of the guide tube 2, and two sealing rings 3 are installed in the annular grooves 204.

[0021] like Figure 6 As shown, the jetting fluid 1 is assembled and welded from a sliding sleeve 101, two short connectors 102, two long branch pipes 103, several water spray pipes 104, a blocking plate 105, an upper lifting lug 106, and a limiting plate 107. The inner hole of the sliding sleeve 101 is precision machined to fit with the sliding surface 201 of the guide tube 2 with a clearance. The two short connectors 102 are horizontally welded to both sides of the sliding sleeve 101. One end of the long branch pipe 103 is sealed and its side is welded to the short connector 102. Several water spray pipes 104 are welded to the bottom of the long branch pipe 103. The other end of the long branch pipe 103 is welded to the blocking plate 105 for sealing. The middle hole of the blocking plate 105 fits with the pin 8 with a clearance. The pin 8 is made of copper alloy.

[0022] like Figures 1-5 As shown, the lower part of the support plate 6 is welded to the upper surface of the front part of the heating furnace fire tube 12, and the upper part is connected to and supports the blind end of the guide tube 2 by bolts. Figures 1-5 and Figure 9 As shown, the lower part of the support frame 7 is welded to the upper rear surface of the fire tube 12, and a pin hole 701 is machined on the upper part to be interference-fitted with the pin 8; when the support plate 6 and the support frame 7 are installed, the guide tube 2 is coaxial with the pin hole 701 to ensure that the jet 1 can swing freely.

[0023] like Figure 1 and Figure 5 As shown, to prevent the jet 1 from stopping at the middle position when it swings, an upper lifting lug 106 is welded to the upper part of the blocking plate 105 of the jet 1, and a lower lifting lug 703 is welded to the outside of the support frame 7. A tension spring 9 is connected between the upper lifting lug 106 and the lower lifting lug 703. When the jet 1 swings through the middle position, the tension spring 9 is stretched to its maximum, thereby preventing the jet 1 from stopping at the middle position.

[0024] like Figure 1 and Figure 5As shown, to prevent the jet 1 from swinging excessively, a limiting plate 107 is welded to the lower part of the blocking plate 105 of the jet 1. A hole is drilled in the limiting plate 107, and a limiting pin 10 is interference-fitted onto it. An arc-shaped notch 702 is machined on the lower part of the support frame 7 corresponding to the position of the limiting pin 10. The arc angle of the arc-shaped notch 702 is set to be the same as the included angle L of the axes of the two water outlets 202 of the guide tube 2, and the width of the arc-shaped notch 702 is greater than the diameter of the limiting pin 10. One end of the limiting pin 10 is inserted into the hole of the limiting plate 107, and the other end is inserted into the arc-shaped notch 702 of the support frame 7. When the jet 1 swings to one side until the limiting pin 10 reaches one end of the arc-shaped notch 702, one of the water outlets 202 of the guide tube 2 is aligned with the inner hole of one of the short-circuit 102 of the jet 1, as shown. Figure 4 As shown.

[0025] When the pressure of the liquid to be heated is low, a booster pump is installed outside the furnace to increase the jetting force of the liquid.

[0026] The specific technical principle and usage of the jet descaling device are as follows: The jet descaling device uses the liquid to be heated, which is fed into the heating furnace, to jet-wash the upper surface of the fire tube to remove scale. When the jet descaling device stops operating, the jet fluid 1 swings to one side and stops due to the reaction force of the jet and the tension of the tension spring 9.

[0027] When the heating furnace is started, the liquid to be heated is transported through the water inlet pipe 4 into the guide tube 2 inside the furnace, such as... Figure 2 and Figure 11 As shown; then, the water enters through one of the outlet holes 202 into the corresponding long branch pipe 103 of the jet 1, as... Figure 4 and Figure 12 As shown. The liquid to be heated is sprayed downwards through several of the aforementioned water spray pipes 104, washing over the upper surface of the fire tube 12, as... Figure 12 As shown. Simultaneously, the jet reaction force pushes the jet 1 to rotate to the other side, as... Figure 12 Rotate clockwise and sweep across the upper surface of the fire tube 12; when the jet fluid 1 swings past the middle position, as Figure 3 As shown, the water outlet 202 of the guide tube 2 is offset from the short-circuit 102 interface of the jetting fluid 1, and the jetting of the spray pipe 104 corresponding to the long branch pipe 103 basically stops.

[0028] When the jet 1 continues to swing and rotate due to inertia and the force of the tension spring 9 until the limiting pin 10 touches one side of the arc-shaped notch 702 of the support frame 7, another long branch pipe 103 of the jet 1 is connected to another water outlet 202 of the guide tube 2, and several spray pipes 104 of the other long branch pipe 103 spray downward to remove scale.

[0029] Relying on the reaction force of the jet, the jet 1 oscillates repeatedly, washing and cleaning the upper surface of the fire tube 12 to remove scale.

Claims

1. A jet descaling device for fire tubes of a fire-tube type heating furnace, characterized in that: A jet descaling device is arranged on the upper part of each fire tube (12) in the furnace, including a water inlet pipe (4), a guide tube (2), a jet (1), a support plate (6), a support frame (7), and a pin (8). The scale is removed by flushing the upper surface of the fire tube (12) with the liquid to be heated. The water inlet pipe (4) transports the liquid to be heated, which is introduced from outside the furnace and welded and sealed to the furnace shell (11); the inner end of the water inlet pipe (4) is provided as a flange face and is connected to the guide tube (2) by bolts; The guide tube (2) is configured as a cylindrical shape with one end closed and the other end thickened. Threaded blind holes (203) are machined on both end faces for mounting bolts. The outer non-thickened cylindrical surface of the guide tube (2) is precision machined into a sliding surface (201), and two water outlet holes (202) are machined laterally in the blind hole on the inner side. The included angle L of the axes of the two water outlet holes (202) is set to 110°~120°. The jetting fluid (1) is assembled and welded from a sliding sleeve (101), two short connectors (102), two long branch pipes (103), several water spray pipes (104), and a blocking plate (105); wherein, the inner hole of the sliding sleeve (101) is precision machined and has a clearance fit with the sliding surface (201) of the guide tube (2); the two short connectors (102) are horizontally welded to both sides of the sliding sleeve (101); one end of the long branch pipe (103) is blocked and its side is welded to the short connector (102); several water spray pipes (104) are welded to the bottom of the long branch pipe (103); the other end of the long branch pipe (103) is welded to the blocking plate (105) and blocked; the middle hole of the blocking plate (105) has a clearance fit with the pin (8); The lower part of the support plate (6) is welded to the upper front surface of the fire tube (12) of the heating furnace, and the upper part is connected by bolts to support the blind end of the guide tube (2); the lower part of the support frame (7) is welded to the upper rear surface of the fire tube (12), and a pin hole (701) is machined on the upper part to be interference fit with the pin (8); when the support plate (6) and the support frame (7) are installed, the guide tube (2) is coaxial with the pin hole (701) to ensure that the jet (1) can swing freely.

2. The jet descaling device for the fire tube of a fire-tube type heating furnace according to claim 1, characterized in that: To prevent the jet (1) from staying in the middle position when it swings, an upper lifting lug (106) is welded to the upper part of the block plate (105) of the jet (1), and a lower lifting lug (703) is welded to the outside of the support frame (7). A tension spring (9) is connected between the upper lifting lug (106) and the lower lifting lug (703). When the jet (1) swings through the middle position, the tension spring (9) is stretched to the maximum, thereby preventing the jet (1) from staying in the middle position.

3. The jet descaling device for the fire tube of a fire-tube type heating furnace according to claim 1, characterized in that: To prevent excessive oscillation of the jet fluid (1), a limiting plate (107) is welded to the lower part of the plug plate (105) of the jet fluid (1). A hole is drilled in the limiting plate (107), and a limiting pin (10) is interference-fitted. An arc-shaped notch (702) is machined at the lower part of the support frame (7) corresponding to the position of the limiting pin (10). The arc angle of the arc-shaped notch (702) is set to be the same as the included angle L of the axis of the two water outlets (202) of the guide tube (2), and the arc angle is... The width of the notch (702) is greater than the diameter of the limiting pin (10); one end of the limiting pin (10) is inserted into the hole of the limiting plate (107), and the other end is inserted into the arc-shaped notch (702) of the support frame (7); when the jet (1) swings to one side until the limiting pin (10) reaches one end of the arc-shaped notch (702), one of the water outlet holes (202) of the guide tube (2) is aligned with the inner hole of one of the short circuits (102) of the jet (1).

4. The jet descaling device for fire tubes of a fire-tube type heating furnace according to claim 1, characterized in that: For sealing purposes, two annular grooves (204) are machined on the sliding surface (201) on both sides of the water outlet (202) of the guide tube (2), and two sealing rings (3) are installed in the annular grooves (204); a sealing gasket (5) is set at the connection surface between the water inlet pipe (4) and the guide tube (2).

5. The jet descaling device for fire tubes of a fire-tube type heating furnace according to claim 1, characterized in that: In order to reduce the oscillation resistance of the jet (1), the guide tube (2) and the pin (8) are made of copper alloy.

6. The jet descaling device for fire tubes of a fire-tube type heating furnace according to claim 1, characterized in that: When the pressure of the liquid to be heated is low, a booster pump is installed outside the furnace to increase the jetting force of the liquid.

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