Online replacement method for burner of four-corner tangential pulverized coal furnace

Abstract

The invention relates to the technical field of four-corner tangential pulverized coal furnaces, in particular to an online replacement method for a burner of a four-corner tangential pulverized coal furnace. Comprising the steps that S1, the four-corner tangential pulverized coal furnace is in a running state; s2, the center line of the top face is marked on the top face of the old combustor, a guide rod is fixed to the upper portion of the old combustor, two conical drop hammers are fixedly connected to the guide rod through lifting ropes, and the bottom ends of the conical drop hammers are aligned to the center line and abut against the top face; s3, the old combustor is disassembled; s4, drawing a center line of the side surface on the side surface of the new combustor, and welding a supporting plate at the position of the center line; s5, a new combustor is installed, and it is guaranteed that the center line of the top face of the new combustor is aligned with the bottom end of the conical drop hammer and abuts against the bottom end of the conical drop hammer; a gradienter is placed on the supporting plate to ensure that the supporting plate is in a horizontal state; the burner of the four-corner tangential pulverized coal furnace can be replaced on line without shutdown, and huge economic loss caused by shutdown replacement is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of tangential pulverized coal furnaces, in particular to an online replacement method for a burner of a tangential pulverized coal furnace. Background Art

[0002] The four-corner tangential pulverized coal furnace burner and the powder pipe conveying medium are pulverized coal. The pulverized coal particles cause scouring and wear on the burner. As the boiler runs longer, the burner structure is damaged, affecting the pulverized coal airflow, which is prone to furnace coking and causes non-stop accidents. The burner needs to be replaced. The existing method of replacing the burner is to stop the furnace for replacement and re-position the tangential circle in the furnace to ensure a good tangential combustion state. However, stopping the furnace for replacement will cause huge economic losses. How to achieve online replacement of the burner without stopping the furnace is a problem that needs to be solved. Summary of the invention

[0003] The main purpose of the present invention is to provide a method for online replacement of a burner of a tangentially shaped pulverized coal furnace, so as to solve the problem in the above-mentioned prior art of how to achieve online replacement of the burner without stopping the furnace.

[0004] In order to achieve the above object, the present invention provides a method for online replacement of a tangential pulverized coal furnace burner, comprising the following steps: S1. The tangential pulverized coal furnace is in operation, and the position of an old burner that needs to be removed is determined; S2. Draw a center line on the top surface of the old burner, fix a guide rod above the old burner, and connect two conical hanging weights to the guide rod through hanging ropes, with the bottom ends of the conical hanging weights aligned with the center line and in contact with the top surface; S3. Remove the old burner; S4. Draw the center line of the side of the new burner and weld the support plate at the center line. S5. Install the new burner, ensuring that the center line of the top surface of the new burner is aligned with and abuts against the bottom end of the conical pendant; place a level on the support plate to ensure that the support plate is in a horizontal state.

[0005] Furthermore, step S1 also includes: controlling the negative pressure in the four-corner cut pulverized coal furnace to between -150Pa and -200Pa and maintaining it in this range during the subsequent maintenance process.

[0006] Furthermore, step S1 also includes: the boiler operator carries out steam soot blowing once in advance according to the steam temperature, and inspects and cleans the coking on the heating surface of the water-cooled wall at each corner; after the maintenance starts, the steam soot blowing is stopped to avoid negative pressure fluctuations.

[0007] Furthermore, between steps S2 and S3, there is also step S2.1: closing the dampers of the secondary air ducts on the upper and lower layers of the old burner and performing power-off, locking and tagging.

[0008] Furthermore, between steps S2.1 and S3 there is also step S2.2: closing the peripheral wind damper 6 , a groove is made on one side of the peripheral wind damper 6 close to the peripheral wind duct 7 and a plug plate is inserted therein, so as to isolate the peripheral wind duct 7 from the secondary wind box 9 .

[0009] Furthermore, step S2.3 is also included between steps S2.2 and S3: closing the damper of the primary air duct and disconnecting the primary air duct from the old burner, welding a sealing plate at the disconnection on the primary air duct; welding a sealing plate at the disconnection on burner 1 to ensure that the flame in the furnace is isolated from the outside world.

[0010] Furthermore, step S2.4 is also included between step S2.3 and step S3: removing the external baffle of the peripheral wind duct and sealing the peripheral wind nozzle with tooling.

[0011] Furthermore, between step S3 and step S4, there is also step S3.1: using a baffle to block the mounting hole left after the old burner is disassembled, so as to ensure that the furnace flame is isolated from the outside.

[0012] The beneficial effects of the present invention are: It can realize the online replacement of the burner of the four-corner tangential pulverized coal furnace without stopping the furnace, avoiding huge economic losses caused by stopping the furnace for replacement; it can realize the tangential positioning outside the furnace to avoid the burner deviating from the tangential position after installation; it can use plug plates, baffles, etc. for safety isolation; it can avoid the high-temperature radiant heat, high-temperature primary and secondary air, and positive pressure flame spraying in the furnace from causing harm to workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings in the specification, which constitute a part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0014] Figure 1 Schematic diagram of the tangential circle distribution structure of the burner in the embodiment; Figure 2 It is a schematic diagram of the structure of the burner and the secondary air duct distribution in the embodiment; Figure 3 It is a structural schematic diagram of the burner in the embodiment; Figure 4 A schematic diagram of the burner tangential circle positioning in the embodiment; Figure 5 A schematic diagram of the top surface and the center line of the top surface of the burner in the embodiment; In the figure: 1. burner; 101. peripheral air nozzle; 2. guide rod; 3. conical hanging hammer; 4. support plate; 5. primary air duct; 6. bellows; 7. peripheral air duct; 701. external baffle; 8. secondary air duct; 9. secondary bellows. DETAILED DESCRIPTION

[0015] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0016] like Figures 1 to 5 As shown, according to an embodiment of the present invention, a method for online replacement of a tangential pulverized coal furnace burner is provided, comprising the following steps: S1. The four-corner tangential pulverized coal boiler is in operation. Determine the location of an old burner 1 that needs to be dismantled; set up a safety platform for workers to use; control the negative pressure in the four-corner tangential pulverized coal boiler between -150Pa and -200Pa and keep it in this range during the subsequent maintenance process; the boiler operator conducts steam soot blowing once in advance according to the steam temperature, and checks and cleans the coking on the heating surface of the water-cooled wall at each corner; after the maintenance begins, stop steam soot blowing to avoid negative pressure fluctuations.

[0017] S2. Draw a center line on the top surface of the old burner 1, fix a guide rod 2 above the old burner 1, the guide rod 2 is welded to the side wall of the furnace wall or the air duct, and at least two conical hanging weights 3 are fixedly connected to the guide rod 2 through hanging ropes, and the bottom ends of the conical hanging weights 3 are aligned with the center line and abut against the top surface; S2.1: Close the dampers of the secondary air duct 8 on the upper and lower layers of the old burner and lock and tag them out; S2.2: Close the peripheral air damper 6, a slot is made on one side of the peripheral air damper 6 close to the peripheral air duct 7 and a plug plate is inserted to isolate the peripheral air duct 7 from the secondary air box 9; S2.3: Close the damper of the primary air duct 5 and disconnect the primary air duct 5 from the old burner 1, and weld a sealing plate at the disconnection point on the primary air duct 5; weld a sealing plate at the disconnection point on the old burner 1 to ensure that the flame in the furnace is isolated from the outside; S2.4: Remove the outer baffle 701 of the peripheral wind duct 7, and use a tool to block the peripheral wind nozzle 101; S3. Use the 3T guide chain to assist in removing the old burner 1; S3.1: Use a baffle to cover the mounting hole left after the old burner 1 is removed to ensure that the furnace flame is isolated from the outside world; S4. Draw a center line on the side of the new burner 1, and weld the support plate 4 at the position of the center line; S5. Install the new burner 1, ensuring that the center line of the top surface of the new burner 1 is aligned with and abuts against the bottom end of the conical pendant 3; place a spirit level on the support plate 4 to ensure that the support plate 4 is in a horizontal state; restore the primary air duct 5 and the peripheral air duct 7 to their original state.

[0018] The principle of positioning the furnace circumscribed circle in this embodiment is: to ensure that the angle of the newly installed burner in the left-right direction is the same as that of the old burner by using a pendulum to draw a straight line between two points; and to ensure the levelness of the newly installed burner by placing a level on the support plate.

[0019] This embodiment can realize the online replacement of the burner of the four-corner tangential pulverized coal furnace without stopping the furnace, avoiding huge economic losses caused by stopping the furnace for replacement; it can realize the tangential positioning outside the furnace, avoiding the burner from deviating from the tangential position after installation; use plug plates, baffles, etc. for safety isolation; avoid the high-temperature radiant heat, high-temperature primary and secondary air, and positive pressure flame spraying in the furnace from causing harm to workers.

[0020] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for online replacement of a tangential pulverized coal furnace burner, characterized in that: The following steps are involved: S1. The tangential pulverized coal furnace is in operation, and the position of an old burner (1) that needs to be removed is determined; S2. Draw a center line on the top surface of the old burner (1), fix a guide rod (2) above the old burner (1), and connect two conical hanging weights (3) to the guide rod (2) via hanging ropes, with the bottom ends of the conical hanging weights (3) aligned with the center line and in contact with the top surface; S3, dismantling the old burner (1); S4. Draw a center line on the side of the new burner (1), and weld a support plate (4) at the position of the center line. S5. Install the new burner (1) to ensure that the center line of the top surface of the new burner (1) is aligned with the bottom end of the conical pendant (3) and abuts against the bottom end of the conical pendant (3); place a level on the support plate (4) to ensure that the support plate (4) is in a horizontal state.

2. The method for online replacement of a tangentially shaped pulverized coal furnace burner according to claim 1, characterized in that: The step S1 also includes: controlling the negative pressure in the tangential pulverized coal furnace to be between -150Pa and -200Pa and maintaining it in this range during the subsequent maintenance process.

3. The method for online replacement of a tangentially shaped pulverized coal furnace burner according to claim 2, characterized in that: The step S1 also includes: the boiler operator carries out steam soot blowing once in advance according to the steam temperature, and checks and cleans the coking on the heating surface of the water-cooled wall at each corner; after the maintenance starts, the steam soot blowing is stopped to avoid negative pressure fluctuations.

4. The method for online replacement of a tangentially shaped pulverized coal furnace burner according to claim 1, characterized in that: The steps S2 and S3 further include step S2.1: closing the dampers of the secondary air ducts (8) on the upper and lower layers of the old burner (1) and performing power-off, locking and tagging.

5. The method for online replacement of a tangentially shaped pulverized coal furnace burner according to claim 4, characterized in that: The steps S2.2 are further included between steps S2.1 and S3: closing the peripheral air damper (6), slotting the peripheral air damper (6) on one side close to the peripheral air duct (7) and inserting a plug plate, thereby isolating the peripheral air duct (7) from the secondary air box (9).

6. The method for online replacement of a tangentially shaped pulverized coal furnace burner according to claim 5, characterized in that: The step S2.3 is also included between the steps S2.2 and S3: closing the damper of the primary air duct (5) and disconnecting the primary air duct (5) from the old burner (1), and welding a sealing plate at the disconnection point on the primary air duct (5); and welding a sealing plate at the disconnection point on the old burner (1) to ensure that the flame in the furnace is isolated from the outside.

7. The method for online replacement of a tangentially shaped pulverized coal furnace burner according to claim 6, characterized in that: The steps S2.3 and S3 further include step S2.4: removing the external baffle (701) of the peripheral wind duct (7), and using a tool to seal the peripheral wind nozzle (101).

8. The method for online replacement of a tangentially shaped pulverized coal furnace burner according to claim 1, characterized in that: The steps S3 and S4 further include step S3.1: using a baffle to block the mounting hole left after the old burner (1) is disassembled, so as to ensure that the furnace flame is isolated from the outside.

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