A method of using an online flushing spray gun device for a preheater

Abstract

A method of using an on-line flushing spray gun device for a preheater. During the operation of the air preheater, the central control module controls the opening of the sub-pipeline solenoid valves at both ends of the spray gun through the solenoid valve execution module respectively. After the sub-pipeline solenoid valves are opened respectively, the central control module controls the opening of the pressurized water pump through the pressurized water pump execution module. At the same time, tap water is pressurized by the pressurized water pumps on both sides to become pressurized water, and the pressurized water enters the first main pipeline respectively. The first main pipeline sequentially enters the spray gun and the three-notch nozzle through the sub-pipeline solenoid valve, and the pressurized water is sprayed and cleaned on the surface of the air preheater corresponding to the middle fan-shaped notch and the side fan-shaped notch of the three-notch nozzle. By increasing the number of nozzles, the notch width and angle, the present invention can achieve wide-range flushing. The installation sleeve is detachable, the nozzle is easy to dredge or replace, and the operation is simple. The service life of the spray gun and the nozzle is prolonged, and the long-term normal operation of the air preheater can be ensured.

Description

Technical Field

[0001] The present invention relates to a spray gun applied to on-line flushing of a preheater, in particular to a method for using a spray gun device applied to on-line flushing of a preheater. Background Art

[0002] At present, an air preheater is a heat exchange device that uses the waste heat of flue gas at the tail of a heating furnace to heat the air required for fuel combustion; usually, the air preheater is arranged at the tail of a boiler and is in a low-temperature flue gas area of water vapor and sulfuric acid vapor, and the environment is relatively harsh, especially ash fouling occurs. Once ash fouling occurs in the preheater, the flue gas passage will be blocked, the draft resistance will increase, the output of the boiler will be affected, and a boiler shutdown accident will be caused. Therefore, usually, the nozzles of on-line flushing spray guns for preheaters are shower heads, solid cone nozzles, and spiral nozzles. However, due to the large coverage area sprayed by the shower head and the spiral nozzle, the flow velocity of the water flow is slow and the impact force is small, and the fouling parts of the air preheater cannot be removed, and the cleaning ability is not ideal; the solid cone nozzle has a relatively large impact force, but the aperture of the nozzle is very small and is particularly easy to block and cannot be dredged, and the nozzle needs to be frequently replaced, making it difficult to ensure the long-term safe and stable operation of the preheater; due to the above-mentioned many reasons, a method for using a spray gun device applied to on-line flushing of a preheater is now proposed. Summary of the Invention

[0003] The purpose of the present invention is to overcome the problems that the nozzles of on-line flushing spray guns for preheaters are usually shower heads, solid cone nozzles, and spiral nozzles. However, due to the large coverage area sprayed by the shower head and the spiral nozzle, the flow velocity of the water flow is slow and the impact force is small, and the fouling parts of the air preheater cannot be removed, and the cleaning ability is not ideal; the aperture of the solid cone nozzle is very small and is particularly easy to block and needs to be frequently replaced, and it can meet the requirements of long-term use; now through reasonable design, a method for using a spray gun device applied to on-line flushing of a preheater is provided; the high-pressure water flow of the present invention is sprayed out as jet water through the middle sector-shaped notch and the side sector-shaped notch, and the middle sector-shaped notch and the side sector-shaped notch can perform strong on-line flushing on the surface of the preheater through the jet water. Since the impact force of the high-pressure jet water is relatively large, it can prevent fouling on the surface of the preheater, reduce ash fouling at the tail of the boiler of the lower air preheater, and ensure the smoothness of the flue gas passage. In addition, both the middle sector-shaped notch and the side sector-shaped notch are relatively large openings, not easily blocked, and have a relatively large impact force, which has a good effect on flushing the fouling of the preheater; by increasing the number of nozzles, the width and angle of the notch, wide-range flushing can be achieved; the installation sleeve is provided to be detachable, the nozzle is easy to replace, and the operation is simple; a gate valve is arranged at the end, which can be opened and closed, facilitating maintenance and replacement, extending the service life of the spray gun and the nozzle, and being able to ensure the long-term normal operation of the air preheater.

[0004] To achieve the above object, the present invention adopts the following technical solution. A method of using an on-line flushing spray gun device for a preheater. The on-line flushing spray gun device for a preheater is composed of a first main pipeline, a second main pipeline, a first water inlet pipeline, a second water inlet pipeline, a sub-pipeline joint, a spray gun, a sub-pipeline solenoid valve, a three-notch nozzle, a middle sector notch, a side sector notch, a spherical nozzle, a nozzle interface, a pressurized water pump, a control module, a central control module, a pressurized water pump execution module, a solenoid valve execution module, and a pressure sensing probe. One end of the first main pipeline and the second main pipeline are respectively set as plugs. The other ends of the first main pipeline and the second main pipeline are respectively provided with the first water inlet pipeline and the second water inlet pipeline. The water inlet ends of the first water inlet pipeline and the second water inlet pipeline are respectively provided with a pressurized water pump. The pipeline port at the rear end of the pressurized water pump is set as tap water.

[0005] At least three pairs of sub-pipeline joints are symmetrically arranged on the opposite sides of the first main pipeline and the second main pipeline. At least three pairs of sub-pipeline joints between the first main pipeline and the second main pipeline are evenly distributed or arranged in parallel. A spray gun is arranged between each pair of sub-pipeline joints. A sub-pipeline solenoid valve is arranged between the two ends of a spray gun and the sub-pipeline joints. At least two pairs of three-notch nozzles are symmetrically arranged at both ends on one side of the spray gun. The inlet end of the three-notch nozzle is set as a nozzle interface, and the other end of the three-notch nozzle is set as a spherical nozzle. A middle sector notch is reserved at the spherical center of the spherical nozzle, and a pair of side sector notches are symmetrically reserved on both sides of the middle sector notch.

[0006] The three-notch nozzles on one side of the spray gun are all arranged corresponding to the direction of the air preheater. At least four pressure sensing probes are arranged on the air preheater, and the pressure sensing probes are arranged at the positions where the water spraying is concentrated or corresponding to the three-notch nozzles.

[0007] A net-shaped spray gun device is respectively arranged between the first main pipeline and the second main pipeline and the spray gun. A control module is arranged on one side of the spray gun device. The central control module, the pressurized water pump execution module, and the solenoid valve execution module are respectively arranged on the control module.

[0008] A sensing signal line is arranged between one side of the central control module and the pressure sensing probe. An execution signal line is respectively arranged between the other side of the central control module and the pressurized water pump execution module and the solenoid valve execution module. A switch controller is arranged on the sub-pipeline solenoid valve. A control signal line is respectively arranged between the solenoid valve execution module and the switch controller of the sub-pipeline solenoid valve. A switch controller is arranged on the pressurized water pump. An execution signal line is respectively arranged between the pressurized water pump execution module and the switch controller of the pressurized water pump.

[0009] During the operation of the air preheater, the central control module controls the opening of the branch pipe solenoid valves at both ends of the spray gun through the solenoid valve execution module; after the branch pipe solenoid valves are opened respectively, the central control module controls the opening of the pressurizing water pump through the pressurizing water pump execution module; meanwhile, tap water is pressurized by the pressurizing water pumps on both sides to become pressurized water, and the pressurized water enters the first main pipe and the second main pipe respectively and then enters the spray gun and the three-notch nozzle through the branch pipe solenoid valves in sequence. The pressurized water is sprayed and cleaned on the surface of the air preheater through the middle fan-shaped notch and the side fan-shaped notch of the three-notch nozzle;

[0010] During the on-line flushing process of the surface of the air preheater, when the pressure sensing probe detects a pressure drop, after the central control module receives the pressure drop, the central control module increases the flow rate of the pressurized water of the branch pipe solenoid valve through the solenoid valve execution module. When the pressure sensing probe detects normal pressure, the central control module controls the branch pipe solenoid valve to stop increasing the flow rate;

[0011] During the on-line flushing process of the surface of the air preheater, when the pressure sensing probe detects a pressure drop on the local surface of the air preheater, after the central control module receives the pressure drop, the central control module increases the flow rate of the pressurized water of the branch pipe solenoid valve at the corresponding position through the solenoid valve execution module. When the pressure sensing probe detects a continuous pressure drop, the central control module controls the opening of the pressurizing water pump through the pressurizing water pump execution module to pressurize;

[0012] After the central control module simultaneously controls the branch pipe solenoid valve and the pressurizing water pump to increase the pressure, when the pressure sensing probe detects a continuous pressure drop, the central control module controls the pressurizing water pump to return to the normal pressure, and the central control module starts the alarm to alarm through the flashing of the red light; at the same time, the central control module closes the branch pipe solenoid valve of the locally blocked spray gun. After the staff sees the red light and arrives at the scene in time, according to the requirements of safe production, the blocked spray gun, the middle fan-shaped notch and the side fan-shaped notch of the three-notch nozzle are repaired or replaced manually.

[0013] Beneficial effects: By increasing the number of nozzles, the slot width and the angle, the present invention can achieve a wide range of flushing; the installation sleeve is detachable, the nozzle is easy to dredge or replace, and the operation is simple; a gate valve is arranged at the end, which can be opened and closed, facilitating maintenance and replacement, prolonging the service life of the spray gun and the nozzle, and ensuring the long-term normal operation of the air preheater. Brief Description of the Drawings

[0014] The present invention will be further described below with reference to the accompanying drawings:

[0015] Figure 1 is the overall assembly structure diagram;

[0016] Figure 2 is Figure 1 the partial structure diagram of

[0017] Figure 3 is Figure 1 schematic diagram of the spray gun structure

[0018] Figure 4 is Figure 1 schematic diagram of the three-notch nozzle structure

[0019] Figure 5 is Figure 1 schematic diagram of the control circuit structure

[0020] Figure 1 and 2 In 3, 4, and 5: the first main pipeline 1, the second main pipeline 2, the first water inlet pipeline 3, the second water inlet pipeline 4, the sub-pipeline joint 5, the spray gun 6, the sub-pipeline solenoid valve 7, the three-notch nozzle 8, the middle fan-shaped notch 9, the side fan-shaped notch 10, the spherical nozzle 11, the nozzle interface 12, the pressurized water pump 13, the control module 14, the central control module 15, the pressurized water pump execution module 16, the solenoid valve execution module 17, and the pressure sensing probe 18. Specific embodiments

[0021] The present invention will be further described in detail below in conjunction with the embodiments and specific embodiments:

[0022] Embodiment 1

[0023] One end of the first main pipeline 1 and the second main pipeline 2 is respectively set as a plug, and the other ends of the first main pipeline 1 and the second main pipeline 2 are respectively provided with the first water inlet pipeline 3 and the second water inlet pipeline 4. The water inlet ends of the first water inlet pipeline 3 and the second water inlet pipeline 4 are respectively provided with a pressurized water pump 13, and the pipeline port at the rear end of the pressurized water pump 13 is set as tap water;

[0024] At least three pairs of sub-pipeline joints 5 are symmetrically arranged on the opposite sides of the first main pipeline 1 and the second main pipeline 2. The at least three pairs of sub-pipeline joints 5 between the first main pipeline 1 and the second main pipeline 2 are evenly distributed or arranged in parallel. A spray gun 6 is arranged between each pair of sub-pipeline joints 5. A sub-pipeline solenoid valve 7 is arranged between the two ends of a spray gun 6 and the sub-pipeline joints 5. At least two pairs of three-notch nozzles 8 are symmetrically arranged at both ends on one side of the spray gun 6; The inlet end of the three-notch nozzle 8 is set as the nozzle interface 12, the other end of the three-notch nozzle 8 is set as the spherical nozzle 11, the spherical center of the spherical nozzle 11 is reserved as the middle fan-shaped notch 9, and a pair of side fan-shaped notches 10 are symmetrically reserved on both sides of the middle fan-shaped notch 9;

[0025] The three-notch nozzles 8 on one side of the spray gun 6 are all arranged corresponding to the direction of the air preheater, and at least four pressure sensing probes 18 are arranged on the air preheater, and the pressure sensing probes 18 are arranged at the positions where the water spray is concentrated or corresponding to the three-notch nozzles 8;

[0026] A mesh spray gun device is provided between the first main pipeline 1 and the second main pipeline 2 respectively and is connected to the spray gun 6. A control module 14 is provided on one side of the spray gun device, and a central control module 15, a pressurized water pump execution module 16, and a solenoid valve execution module 17 are respectively provided on the control module 14.

[0027] A sensing signal line is provided between one side of the central control module 15 and the pressure sensing probe 18, and an execution signal line is provided between the other side of the central control module 15 and the pressurized water pump execution module 16 and the solenoid valve execution module 17 respectively; a switch controller is provided on the branch pipeline solenoid valve 7, and a control signal line is provided between the solenoid valve execution module 17 and the switch controller of the branch pipeline solenoid valve 7 respectively. A switch controller is provided on the pressurized water pump 13, and an execution signal line is provided between the pressurized water pump execution module 16 and the switch controller of the pressurized water pump 13 respectively.

[0028] During the operation of the air preheater, the central control module 15 controls the opening of the branch pipeline solenoid valves 7 at both ends of the spray gun 6 respectively through the solenoid valve execution module 17; after the branch pipeline solenoid valves 7 are respectively opened, the central control module 15 controls the opening of the pressurized water pump 13 through the pressurized water pump execution module 16; meanwhile, the tap water is pressurized by the pressurized water pumps 13 on both sides to be pressure water, and the pressure water enters the first main pipeline 1 and the second main pipeline 2 respectively and then enters the spray gun 6 and the three-notch nozzle 8 through the branch pipeline solenoid valves 7 in sequence. The pressure water is sprayed and cleaned on the surface of the air preheater through the middle fan-shaped notch 9 and the side fan-shaped notch 10 of the three-notch nozzle 8.

[0029] Embodiment 2

[0030] During the on-line flushing of the surface of the air preheater, when the pressure sensing probe 18 detects a pressure drop, after the central control module 15 receives the pressure drop, the central control module 15 increases the flow rate of the pressure water of the branch pipeline solenoid valve 7 through the solenoid valve execution module 17. When the pressure sensing probe 18 detects normal pressure, the central control module 15 controls the branch pipeline solenoid valve 7 to stop increasing the flow rate.

[0031] Embodiment 3

[0032] During the on-line flushing of the surface of the air preheater, when the pressure sensing probe 18 detects a pressure drop on the local surface of the air preheater, after the central control module 15 receives the pressure drop, the central control module 15 increases the flow rate of the pressure water of the corresponding branch pipeline solenoid valve 7 through the solenoid valve execution module 17. When the pressure sensing probe 18 detects a continuous pressure drop, the central control module 15 controls the opening of the pressurized water pump 13 through the pressurized water pump execution module 16 to increase the pressure.

[0033] Embodiment 4

[0034] After the central control module 15 simultaneously controls the branch pipeline solenoid valve 7 and the pressurizing water pump 13 to increase the pressure, when the pressure sensing probe 18 detects that the pressure continues to decrease, the central control module 15 controls the pressurizing water pump 13 to return to the normal pressure, and the central control module 15 activates the alarm to alarm by flashing the red light; at the same time, the central control module 15 closes the branch pipeline solenoid valve 7 of the locally blocked spray gun 6. After the staff sees the red light and arrives at the scene in time, according to the requirements of safe production, the blocked spray gun 6, the middle fan-shaped slot 9 and the side fan-shaped slot 10 of the three-notch nozzle 8 are manually repaired or the components are replaced.

Claims

1. A method of using an on-line flushing spray gun device for a preheater. The on-line flushing spray gun device for a preheater is composed of a first main pipe (1), a second main pipe (2), a first water inlet pipe (3), a second water inlet pipe (4), a branch pipe joint (5), a spray gun (6), a branch pipe solenoid valve (7), a three-notch nozzle (8), a middle sector notch (9), a side sector notch (10), a spherical nozzle (11), a nozzle interface (12), a pressurized water pump (13), a control module (14), a central control module (15), a pressurized water pump execution module (16), a solenoid valve execution module (17), and a pressure sensing probe (18); characterized in that: One end of the first main pipeline (1) and the second main pipeline (2) is respectively set as a plug. The other ends of the first main pipeline (1) and the second main pipeline (2) are respectively provided with a first water inlet pipeline (3) and a second water inlet pipeline (4). Pressure pumps (13) are respectively arranged at the water inlet ends of the first water inlet pipeline (3) and the second water inlet pipeline (4). The pipeline port at the rear end of the pressure pump (13) is set as tap water; At least three pairs of sub-pipeline joints (5) are symmetrically arranged on the opposite corresponding sides of the first main pipeline (1) and the second main pipeline (2). At least three pairs of sub-pipeline joints (5) between the first main pipeline (1) and the second main pipeline (2) are evenly distributed or arranged side by side. A spray gun (6) is arranged between each pair of sub-pipeline joints (5). Sub-pipeline solenoid valves (7) are arranged between the two ends of a spray gun (6) and the sub-pipeline joints (5). At least two pairs of three-notch nozzles (8) are symmetrically arranged at both ends on one side of the spray gun (6); The inlet end of the three-notch nozzle (8) is set as a nozzle interface (12), and the other end of the three-notch nozzle (8) is set as a spherical nozzle (11). A middle sector notch (9) is reserved at the spherical center of the spherical nozzle (11). A pair of side sector notches (10) are symmetrically reserved on both sides of the middle sector notch (9); The three-notch nozzles (8) on one side of the spray gun (6) are all arranged corresponding to the direction of the air preheater. At least four pressure sensing probes (18) are arranged on the air preheater. The pressure sensing probes (18) are arranged at the positions where water spraying is concentrated or corresponding to the three-notch nozzles (8); A net-shaped spray gun device is respectively arranged between the first main pipeline (1) and the second main pipeline (2) and the spray gun (6). A control module (14) is arranged on one side of the spray gun device. A central control module (15), a pressure pump execution module (16), and a solenoid valve execution module (17) are respectively arranged on the control module (14); A sensing signal line is arranged between one side of the central control module (15) and the pressure sensing probe (18). Execution signal lines are respectively arranged between the other side of the central control module (15) and the pressure pump execution module (16) and the solenoid valve execution module (17); A switch controller is arranged on the sub-pipeline solenoid valve (7). A control signal line is arranged between the solenoid valve execution module (17) and the switch controller of the sub-pipeline solenoid valve (7). A switch controller is arranged on the pressure pump (13). An execution signal line is arranged between the pressure pump execution module (16) and the switch controller of the pressure pump (13); During the operation of the air preheater, the central control module (15) controls the opening of the branch pipe solenoid valves (7) at both ends of the spray gun (6) through the solenoid valve execution module (17); after the branch pipe solenoid valves (7) are opened respectively, the central control module (15) controls the opening of the pressurized water pump (13) through the pressurized water pump execution module (16); meanwhile, the tap water is pressurized by the pressurized water pumps (13) on both sides to become pressurized water, and the pressurized water enters the first main pipe (1) and the second main pipe (2) respectively, and then enters the spray gun (6) and the three-notch nozzle (8) through the branch pipe solenoid valves (7), and the pressurized water is sprayed and cleaned on the surface of the air preheater through the middle sector notch (9) and the side sector notch (10) of the three-notch nozzle (8).

2. The usage method of an online flushing spray gun device applied to a preheater, as described in claim 1, is characterized in that: During the on-line flushing process of the surface of the air preheater, when the pressure sensing probe (18) detects a pressure drop, after the central control module (15) receives the pressure drop, the central control module (15) increases the flow rate of the pressurized water of the branch pipe solenoid valve (7) through the solenoid valve execution module (17). When the pressure sensing probe (18) detects normal pressure, the central control module (15) controls the branch pipe solenoid valve (7) to stop increasing the flow rate.

3. The usage method of an online flushing spray gun device applied to a preheater, according to claim 1, is characterized in that: During the on-line flushing process of the surface of the air preheater, when the pressure sensing probe (18) detects a pressure drop on the local surface of the air preheater, after the central control module (15) receives the pressure drop, the central control module (15) increases the flow rate of the pressurized water of the corresponding branch pipe solenoid valve (7) through the solenoid valve execution module (17). When the pressure sensing probe (18) detects a continuous pressure drop, the central control module (15) controls the opening of the pressurized water pump (13) through the pressurized water pump execution module (16) for pressurization.

4. A method for using an online flushing spray gun device applied to a preheater, characterized in that: When the pressure sensing probe (18) detects a continuous pressure drop after the central control module (15) simultaneously controls the branch pipe solenoid valve (7) and the pressurized water pump (13) to increase the pressure, the central control module (15) controls the pressurized water pump (13) to return to the normal pressure, and the central control module (15) starts the alarm to alarm by flashing the red light; at the same time, the central control module (15) closes the branch pipe solenoid valve (7) of the locally blocked spray gun (6). After the staff sees the red light and arrives at the scene in time, according to the requirements of safe production, the blocked spray gun (6), the middle sector notch (9) and the side sector notch (10) of the three-notch nozzle (8) are manually repaired or the components are replaced.

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