Multi-treatment device for accumulated ash in horizontal flue of boiler

Abstract

The invention relates to the technical field of flue accumulated ash treatment, in particular to a boiler horizontal flue accumulated ash multi-treatment device which comprises a gas source system, a gas inlet system, a gas outlet system, a gas outlet system and a gas outlet system. The gas source system is used for providing high-pressure gas for treatment of accumulated ash in a horizontal flue; the soot blowing system is used for blowing accumulated soot in the horizontal flue in an omni-directional rotational flow manner; and the control system is used for controlling the operation of automatic parts in the air source system and the soot blowing system. According to the technical scheme, the omni-directional rotational flow soot blower is adopted to clean accumulated soot in the horizontal flue, 360-degree sweeping can be achieved, and sweeping is comprehensive; the distance between a nozzle of the omni-directional rotational flow soot blower and the surface of a heat exchanger pipe is 100-150 mm, accumulated soot deposited on the surface of the horizontal flue heat exchanger is taken away by means of compressed air flow, the surface of the horizontal flue heat exchanger is not directly scoured by compressed air, and the risks that the wall of the heat exchanger pipe is thinned and the pipe is exploded during soot blowing are avoided; zone step-by-step soot blowing can be adopted, and fire extinguishing accidents caused by hearth negative pressure fluctuation caused by falling of a large amount of accumulated soot due to simultaneous large-area soot blowing are avoided.

Description

Technical Field

[0001] This invention relates to the field of flue ash treatment technology, and in particular to a multi-stage treatment device for ash accumulation in boiler horizontal flues. Background Technology

[0002] Due to various factors such as deviations in coal type, original design, and operational issues, severe ash accumulation occurred in the boiler's horizontal flue. This ash accumulation caused deformation of the heat exchanger tubes in the horizontal flue, and sudden ash collapse led to boiler flameout and shutdown accidents, seriously affecting the safe and stable operation of the generator unit. To address this severe ash accumulation problem in the boiler's horizontal flue, this paper analyzes the causes and hazards of ash accumulation in the horizontal flue and proposes an omnidirectional swirl soot blowing technology for ash removal. This technology aims to prevent ash accumulation in the boiler's horizontal flue, eliminate safety hazards, and ensure the safe and stable operation of the boiler.

[0003] Ash accumulation in the horizontal flue of power plant boilers not only affects the heat exchange efficiency of the heating surfaces but also poses significant safety hazards. Currently, telescopic steam soot blowers are commonly used for soot blowing in the horizontal flue. Due to the high temperature and large blowing space in this area, the nozzle of the telescopic steam soot blower has a large deflection in the horizontal flue. During soot blowing, the nozzle is prone to colliding with the suspended heat exchanger tubes in the horizontal flue, causing safety hazards. In addition, frequent soot blowing and the high-temperature, high-pressure steam scouring the heat exchanger tubes can easily lead to the risk of tube thinning and tube rupture.

[0004] Some boilers do not have soot blowers installed. Under low load operation, the ash accumulation in the horizontal flue can sometimes reach 2-3 meters, causing severe deformation of the horizontal flue heat exchanger tubes. The ash accumulation at higher levels can sometimes suddenly collapse, causing increased negative pressure fluctuations in the furnace, triggering false activation of the flameout protection system, and resulting in boiler shutdown accidents. Therefore, improvements are needed. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a multi-stage treatment device for ash accumulation in boiler horizontal flues.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A multi-stage treatment device for ash accumulation in a boiler horizontal flue includes a horizontal flue and an insulation wall to prevent the loss of heat from the flue gas; a gas source system to provide high-pressure gas for ash treatment in the horizontal flue; a soot blowing system to blow the ash in the horizontal flue in an omnidirectional swirling motion; and a control system to control the operation of the automated components in the gas source system and the soot blowing system.

[0008] The control system can control the storage of high-pressure gas in the gas source system, and also control the state of the soot blowing system that disrupts the ash settling balance in the horizontal flue.

[0009] The gas source system includes a gas supply mechanism, a gas storage mechanism, and a gas transmission mechanism;

[0010] The soot blowing system includes a flow splitting mechanism, a grouping mechanism, and an omnidirectional swirl soot blowing mechanism;

[0011] The diversion mechanism includes a soot blowing main pipe and multiple connecting pipes, which are connected to the grouping mechanism;

[0012] The omnidirectional vortex soot blowing mechanism includes multiple omnidirectional vortex soot blowers, and the omnidirectional vortex soot blowers are connected to the grouping mechanism;

[0013] The omnidirectional vortex soot blower includes an air guide pipe, through which a jet shield is provided. The jet shield has six jet holes at equal intervals around its circumference. At one end of the air guide pipe located inside the jet shield, there are six air guide holes at equal intervals. The horizontal height of the air guide holes is higher than the horizontal height of the jet holes.

[0014] Compared with existing technologies, this technical solution uses an omnidirectional cyclone sootblower to clean ash accumulation in horizontal flues, achieving 360-degree cleaning for comprehensive coverage. The nozzle of the omnidirectional cyclone sootblower is 100-150mm away from the surface of the heat exchanger tubes, relying on compressed air flow to carry away the ash deposited on the surface of the horizontal flue heat exchanger, rather than directly flushing the surface of the horizontal flue heat exchanger with compressed air. This avoids the risk of tube wall thinning and tube rupture during soot blowing. Moreover, in actual operation, soot blowing can be carried out in stages and gradually to avoid large-area soot blowing at the same time, which would cause a large amount of ash to fall off and cause fluctuations in furnace negative pressure, resulting in a fire extinguishing accident.

[0015] Preferably, the gas storage mechanism includes a gas storage tank, with its two sides connected to a gas supply mechanism and a gas transmission mechanism, respectively; the soot blowing header is connected to the conveying mechanism;

[0016] A safety valve is installed at the upper end of the gas storage tank, a pressure gauge is installed on one side of the gas storage tank, a drain pipe is installed through the lower end of the gas storage tank, a manual secondary valve for draining the gas storage tank is installed on the drain pipe, a manual primary valve for draining the gas storage tank is installed at the end of the drain pipe away from the gas storage tank, and a gas supply pipe is provided at the end of the drain pipe away from the gas storage tank.

[0017] Furthermore, the pressure gauge inside the gas tank can accurately detect the gas pressure, and the safety valve can quickly release the gas when the pressure is too high, so as to fully ensure the safety of the gas tank and the safety of its use.

[0018] Furthermore, after the atmosphere is compressed by the compressor to form high-temperature and high-pressure gas, condensation will be produced after cooling. The high-pressure gas will be cooled in the gas storage tank, and the condensation will fall. The condensation can be discharged by setting a manual secondary valve and a manual primary valve for draining the gas storage tank, and can be easily collected in a centralized manner through the gas supply pipe.

[0019] Preferably, the air supply mechanism includes an air supply pipe that runs through one side of the lower end of the air storage tank. An air filter, a manual secondary valve for air intake, and a manual primary valve for air intake are installed sequentially on the air supply pipe. A miscellaneous compressed air main pipe is installed at the end of the air supply pipe away from the air storage tank, and the manual primary valve for air intake is located at the end of the air supply pipe near the miscellaneous compressed air main pipe.

[0020] Furthermore, in actual production and use, the miscellaneous compressed air header can be connected to the miscellaneous compressed air header in the boiler room to supply high-pressure gas to the gas storage tank. Alternatively, appropriate gas compression equipment can be installed as needed to pump air into the gas storage tank, and the selection can be made according to the actual situation.

[0021] The gas can be thoroughly filtered through the air filter to remove impurities, ensuring the quality of the gas in the storage tank and also contributing to the effectiveness of subsequent soot blowing.

[0022] Preferably, the gas supply mechanism includes a gas supply pipe installed on one side of the upper end of the gas storage tank. One end of the gas supply pipe is connected to the soot blowing main pipe. A manual soot blowing main valve, an electric soot blowing main valve, a soot blowing pressure gauge with a valve, and a soot blowing pressure transmitter with a valve are installed sequentially on the gas supply pipe from the gas storage tank to the soot blowing main pipe.

[0023] Furthermore, it can control the high-pressure gas in the gas storage tank to be transported to the soot blowing main pipe through the gas supply pipe so that it can be distributed to different branch pipes. Moreover, in actual production and preparation, the manual valve in this application can be set to the open state, and the operator can control its automated components, such as the electric control valve, to control the soot blowing operation.

[0024] Preferably, the diversion mechanism includes a plurality of wired short connectors that pass through the soot blowing main pipe. One end of each wired short connector is fixedly connected to a manual soot blowing valve. One end of each manual soot blowing valve is fixedly connected to a union. One end of each union is fixedly connected to a soot blowing solenoid valve. One end of each soot blowing solenoid valve is connected to a wired metal connecting hose. The connecting hose is connected to the end of the wired metal connecting hose away from the soot blowing solenoid valve.

[0025] Furthermore, the use of wired metal connecting hoses can fully accommodate installation errors and ensure stable gas delivery.

[0026] Preferably, the grouping mechanism includes two soot blowing manifolds that pass through the connecting pipe, two soot blowing pipes that pass through the soot blowing manifolds, and soot blowing pipes that pass through the horizontal flue. Multiple omnidirectional vortex soot blowers are grouped into sets of four, and multiple sets of omnidirectional vortex soot blowers are respectively installed on multiple soot blowing pipes.

[0027] Furthermore, it facilitates group management and enables the transport of high-pressure gas, allowing the omnidirectional cyclone sootblower to fully output the gas.

[0028] Preferably, the horizontal flue includes a flue pipe, a horizontal flue heat exchanger is installed through the flue pipe, and the grouping mechanism and multiple omnidirectional swirl soot blowers are installed through the horizontal flue heat exchanger.

[0029] One end of the flue pipe is equipped with a flue wear-resistant protective tile, and the other end of the flue wear-resistant protective tile is provided with four protective steel plates at equal intervals. Two jet holes on one side of the protective steel plates are in a blocked state.

[0030] Furthermore, the anti-wear protective tiles for the flue can prevent the accumulated ash blown by it from wearing down the inner wall of the flue pipe, which helps to extend its service life. At the same time, the sealing of the jet holes can make the accumulated ash float in the flue pipe, so that the accumulated ash will move in a direction under the transport of flue gas. In addition, the setting of protective steel plates can also prevent the accumulated ash from damaging the inner wall of the flue pipe.

[0031] In actual production and manufacturing, wear-resistant protective tiles can be installed at the connection points between pipe fittings inside the flue pipe to extend the service life of the components.

[0032] Preferably, the control system includes a soot blowing valve module and a soot blowing main valve module, and the soot blowing valve module includes an open button, a close button, a tag button and a reset button;

[0033] The soot blowing main valve module is equipped with a local / remote switching button, a start button, and a stop button.

[0034] Furthermore, a faulty valve can be marked as faulty by executing a "tag" command in the DCS system. The valve will be skipped during program-controlled soot blowing. If the valve fault is resolved and operation is to be restored, a "reset" command will be executed, and the valve will participate in operation during program-controlled operation.

[0035] The sootblowing electric main valve is equipped with a local / remote switching button, a start button, and a stop button. Pressing the start button starts the sootblowing main valve, and the "open to the limit" indicator light illuminates when it is fully open. Pressing the stop button closes the sootblowing electric main valve, and the "closed to the limit" indicator light illuminates when it is fully closed. Pressing the local / remote switching switch switches the sootblowing electric main valve between local and remote modes, and the corresponding indicator light illuminates. If the sootblowing electric main valve experiences a start or stop failure, the fault indicator light illuminates. This allows for adjustment of the control mode as needed, and corresponding control programs can also be set to achieve automatic sootblowing operations.

[0036] Preferably, the distance between the lowest jet orifice and the lower end of the horizontal flue heat exchanger is greater than 120 mm.

[0037] Furthermore, it can retain a certain thickness of ash accumulation, avoiding frequent soot blowing. The ash accumulation constantly washes over the surface of the heat exchanger tubes, causing wear and thinning of the heat exchanger tubes, thus improving the operational safety of the soot blower.

[0038] The beneficial effects of this invention are:

[0039] 1. The air guide hole of the omnidirectional cyclone sootblower is higher than the jet hole. When the jet hole is blocked by accumulated dust, the air coming out of the air guide hole will blow away the accumulated dust that has entered the jet hole, thus achieving the self-cleaning purpose of the omnidirectional cyclone sootblower.

[0040] 2. The distance between the soot blowing nozzle of the omnidirectional cyclone sootblower installed in the horizontal flue and the bottom of the heat exchanger tube is greater than 120mm, so as to retain a certain thickness of ash accumulation, avoid frequent soot blowing, and prevent the ash accumulation from constantly washing the surface of the heat exchanger tube, which would lead to wear and thinning of the heat exchanger tube, and improve the operational safety of the sootblower.

[0041] 3. The omnidirectional cyclone sootblower loosens and suspends the ash deposited on the bottom heating surface of the boiler's horizontal flue, allowing it to be carried away by the flue gas at a certain speed. This cleans the ash on the heating surface of the horizontal flue, prevents the ash from accumulating in large quantities during low-load operation, and improves the boiler's heat exchange efficiency.

[0042] 4. This application enables real-time online soot blowing, which can promptly prevent boiler shutdown accidents caused by deformation of horizontal flue heat exchanger tubes due to severe ash accumulation and sudden collapse of large amounts of ash. Attached Figure Description

[0043] Figure 1 This is a structural diagram of the present invention;

[0044] Figure 2 This is a diagram showing the component connection structure in this invention;

[0045] Figure 3 This is a diagram showing the internal structure of the horizontal flue in this invention;

[0046] Figure 4 Appendix to this invention Figure 3 Enlarged view of point A;

[0047] Figure 5 This is a structural diagram of the component installation on the connecting pipe in this invention;

[0048] Figure 6 This is a cross-sectional view of the omnidirectional vortex sootblower of the present invention;

[0049] Figure 7 This is a control block diagram of the control system in this invention;

[0050] In the diagram: 1. Air supply system; 11. Air tank; 111. Air tank pressure gauge; 112. Safety valve; 12. Air supply pipe; 121. Air filter; 122. Manual secondary air inlet valve; 123. Manual primary air inlet valve; 124. Miscellaneous compressed air main pipe; 13. Drain pipe; 131. Manual primary air drain valve for air tank; 132. Manual secondary air drain valve for air tank; 133. Water tray; 14. Air supply pipe; 141. Manual main valve for soot blowing; 142. Electric main valve for soot blowing; 143. Soot blowing pressure gauge with valve; 144. Soot blowing pressure gauge with valve. 1. Transmitter; 2. Soot blowing system; 21. Soot blowing header; 22. Connecting pipe; 23. Wired short connector; 24. Soot blowing manual valve; 25. Union connector; 26. Soot blowing solenoid valve; 27. Wired metal connecting hose; 28. Soot blowing manifold; 29. ​​Soot blowing pipe; 210. Omnidirectional cyclone soot blower; 2101. Air guide pipe; 2102. Jet hole; 2103. Air guide hole; 2104. Jet shield; 3. Control system; 4. Thermal insulation wall; 5. Horizontal flue; 51. Flue pipe; 52. Flue wear-resistant protective tile; 53. Protective steel plate; 6. Horizontal flue heat exchanger. Detailed Implementation

[0051] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0052] Reference Figures 1-7 A multi-stage ash treatment device for boiler horizontal flue includes a horizontal flue 5, an insulation wall 4 to prevent the loss of heat from the flue gas within the horizontal flue 5, an air source system 1 to provide high-pressure gas for ash treatment within the horizontal flue 5, a soot blowing system 2 to perform omnidirectional swirling blowing of the ash within the horizontal flue 5, and a control system 3 to control the operation of automated components within the air source system 1 and the soot blowing system 2. The control system 3 can control the air source system 1 to store high-pressure gas while also controlling the soot blowing system 2 to disrupt the ash settling balance within the horizontal flue 5. Through the cooperation between the above components, the high-pressure gas can achieve pulse jet disturbance through the soot blowing system 2, disrupting the ash settling balance and accumulation structure of the horizontal flue, causing the ash deposited at the bottom of the horizontal flue to become a swirling or turbulent flow, flowing away with the flue gas.

[0053] In this embodiment, the soot blowing system 2 includes a flow splitting mechanism, a grouping mechanism, and an omnidirectional swirl soot blowing mechanism. The flow splitting mechanism includes a soot blowing header 21 and multiple connecting pipes 22, which are connected to the grouping mechanism. The omnidirectional swirl soot blowing mechanism includes multiple omnidirectional swirl soot blowers 210, which are connected to the grouping mechanism. Each omnidirectional swirl soot blower 210 includes an air guide pipe 2101, through which a jet shield 2104 is provided. The jet shield 2104 has six jet holes 2102 evenly spaced around its circumference. The air pipe 2101 has six air guide holes 2103 at equal intervals at one end inside the jet shield 2104. The horizontal height of the air guide holes 2103 is higher than the horizontal height of the jet holes 2102. The omnidirectional cyclone soot blower 210 has six jet holes 2102. The jet holes 2102 adopt Laval jet soot blowing flat holes, which spray compressed air soot blowing jets in six directions. The compressed air with a certain pressure and flow rate rolls up the ash, disrupts the original ash settling equilibrium state, and forces the ash to change from static to dynamic and flow away with the flow of flue gas, thereby achieving the purpose of removing ash.

[0054] In actual operation, the omnidirectional cyclone sootblower 210 is made of high-temperature resistant and wear-resistant high-alloy heat-resistant stainless steel 310S, and the upper end of the air guide pipe 2101 is spherically closed, and a cap is added to the top of the air guide pipe 2101. After long-term use of the omnidirectional cyclone sootblower 210, the compressed air will first wear the cap of the air guide pipe 2101. After the cap of the air guide pipe 2101 is worn, a circular protective cap is added to the outside, which extends the service life of the equipment and improves the safety performance of the equipment operation. The high-pressure gas is ejected through the air guide hole 2103 and then output through the jet hole 2102.

[0055] In the omnidirectional cyclone soot blower 210, the air guide hole 2103 is higher than the jet hole 2102. When the jet hole 2102 is blocked by accumulated dust, the air guide hole 2103 will blow out the accumulated dust that has entered the jet hole 2102 after air is introduced, thus achieving the purpose of self-cleaning.

[0056] In actual operation, the soot blowing pipe 29, the air guide pipe 2101 and the heat exchanger tube fins on the horizontal flue heat exchanger 6 in the horizontal flue 5 are sealed by welding. First, the seal is tight and there is no ash leakage. Second, the air guide pipe 2101 and the fins are welded to increase the strength and avoid the possibility of the soot blower tilting due to the flue gas velocity, thereby improving the reliability of equipment operation.

[0057] A wear-resistant protective steel plate is installed at the contact part between the soot blower air duct and the heat exchanger tube to prevent the compressed air from blowing soot from directly scouring the heat exchanger tube.

[0058] Appropriate protective tiles are installed at the base of all pipe fittings located in the horizontal flue 5 to provide comprehensive protection and prevent the gas duct from being worn by flue gas.

[0059] In this embodiment, the gas source system 1 includes a gas supply mechanism, a gas storage mechanism, and a gas transmission mechanism. The gas storage mechanism includes a gas storage tank 11, with its two sides connected to the gas supply mechanism and the gas transmission mechanism, respectively. A soot blowing header 21 is connected to the conveying mechanism. A safety valve 112 is installed at the upper end of the gas storage tank 11, a gas storage tank pressure gauge 111 is installed on one side of the gas storage tank 11, a drain pipe 13 is installed through the lower end of the gas storage tank 11, a gas storage tank drain manual secondary valve 132 is installed on the drain pipe 13, a gas storage tank drain manual primary valve 131 is installed at the end of the drain pipe 13 away from the gas storage tank 11, and a gas supply pipe 14 is provided at the end of the drain pipe 13 away from the gas storage tank 11. The gas pressure gauge 111 can accurately detect the gas pressure inside the gas storage tank 11, and the safety valve 112 can quickly discharge the gas when the pressure is too high, so as to fully ensure the safety of the gas storage tank 11 and ensure the safety of its use.

[0060] Furthermore, after the atmosphere is compressed by the compressor to form a high-temperature and high-pressure gas, condensate will be generated after cooling. The high-pressure gas will be cooled in the gas storage tank 11, and the condensate will fall. The condensate can be discharged by setting the gas storage tank drainage manual secondary valve 132 and the gas storage tank drainage manual primary valve 131, and can be easily collected in a centralized manner through the gas supply pipe 14.

[0061] In this embodiment, the gas supply mechanism includes a gas supply pipe 12 that runs through one side of the lower end of the gas storage tank 11. A permeable filter 121, a manual secondary valve 122, and a manual primary valve 123 are sequentially installed on the gas supply pipe 12. A miscellaneous compressed air header 124 is installed at the end of the gas supply pipe 12 away from the gas storage tank 11. The manual primary valve 123 is located at the end of the gas supply pipe 12 near the miscellaneous compressed air header 124. The miscellaneous compressed air header 124 can connect to the miscellaneous compressed air header in the boiler room to supply high-pressure gas to the gas storage tank 11. Alternatively, a corresponding gas compression device can be installed as needed to pump air into the gas storage tank 11, and the appropriate device can be selected according to the actual situation.

[0062] The gas can be fully filtered by the air filter 121 to remove impurities, ensuring the quality of the gas in the gas storage tank 11 and also contributing to the effect of subsequent soot blowing.

[0063] In this embodiment, the gas supply mechanism includes a gas supply pipe 14 installed on one side of the upper end of the gas storage tank 11. One end of the gas supply pipe 14 is connected to the soot blowing main pipe 21. The gas supply pipe 14 is equipped with a manual soot blowing main valve 141, an electric soot blowing main valve 142, a soot blowing pressure gauge 143 with a valve, and a soot blowing pressure transmitter 144 with a valve, sequentially installed from the gas storage tank 11 to the soot blowing main pipe 21. The high-pressure gas in the gas storage tank 11 is controlled to be transported to the soot blowing main pipe 21 through the gas supply pipe 14 so as to be distributed to different branch pipes. Moreover, under normal circumstances, the manual valve in this application can be set to the open state, and the operator can control its automated components, such as electric control valves, to control the soot blowing operation.

[0064] In this embodiment, the diversion mechanism includes multiple wired short connectors 23 that are disposed through the soot blowing main pipe 21. One end of the wired short connector 23 is fixedly connected to a soot blowing manual valve 24, one end of the soot blowing manual valve 24 is fixedly connected to a union 25, one end of the union 25 is fixedly connected to a soot blowing solenoid valve 26, one end of the soot blowing solenoid valve 26 is connected to a wired metal connecting hose 27, and a connecting pipe 22 is connected to the end of the wired metal connecting hose 27 away from the soot blowing solenoid valve 26. The wired metal connecting hose 27 can fully accommodate installation errors and facilitate stable gas delivery. It is connected by external and internal thread engagement, which facilitates quick disassembly.

[0065] In this embodiment, the grouping mechanism includes two soot blowing manifolds 28 that are installed through the connecting pipe 22. Two soot blowing pipes 29 are installed through the soot blowing manifolds 28. The soot blowing pipes 29 are installed through the horizontal flue 5. Multiple omnidirectional cyclone soot blowers 210 are grouped into groups of four, and multiple groups of omnidirectional cyclone soot blowers 210 are respectively installed on multiple soot blowing pipes 29. This facilitates grouping management and also facilitates the transportation of high-pressure gas so that the omnidirectional cyclone soot blowers 210 can fully output gas.

[0066] In this embodiment, the horizontal flue 5 includes a flue pipe 51, through which a horizontal flue heat exchanger 6 is installed. A grouping mechanism and multiple omnidirectional swirl soot blowers 210 are also installed within the horizontal flue heat exchanger 6. One end of the flue pipe 51 is fitted with a flue wear-resistant protective tile 52, and the other end of the protective tile 52 is provided with four equally spaced protective steel plates 53. Two jet holes 2102 located on one side of the protective steel plates 53 are blocked. The flue wear-resistant protective tile 52 prevents the accumulated ash blown from abrading the inner wall of the flue pipe 51. Wear-resistant materials help extend service life. The sealing of the jet holes 2102 allows the accumulated ash to float within the flue pipe 51, causing it to move directionally under the transport of flue gas. The protective steel plate 53 also prevents damage to the inner wall of the flue pipe 51 from the accumulated ash. In actual production, wear-resistant protective tiles can be installed at the connection points between pipe fittings within the flue pipe 51 to extend the service life of the components. Furthermore, to install the omnidirectional cyclone sootblower, a clearance bend needs to be made on the horizontal flue heat exchanger 6 within the flue pipe 51. Each sootblower group has a clearance bend on each side of the supporting steel beam of the flue pipe 51.

[0067] In this embodiment, the distance between the lowest jet hole 2102 and the lower end of the horizontal flue heat exchanger 6 is greater than 120mm; this can retain a certain thickness of ash accumulation, avoid frequent soot blowing, and prevent the ash accumulation from constantly scouring the surface of the heat exchanger tubes, causing wear and thinning of the heat exchanger tubes, thereby improving the operational safety of the soot blower.

[0068] In this embodiment, the control system 3 is equipped with a soot blowing valve module and a soot blowing main valve module. The soot blowing valve module is equipped with an open button, a close button, a tag button and a reset button.

[0069] The soot blowing main valve module is equipped with a local / remote switching button, a start button, and a stop button.

[0070] In this invention, the control system 3 can control each of the automated components in this application. Each connecting pipe 22 is equipped with a manual soot blowing valve 24 and a soot blowing solenoid valve 26 to control the on / off of compressed air. Under normal circumstances, the manual soot blowing valve 24 can be set to the normally open state, and the start and stop of the soot blowing operation can be controlled by controlling the opening and closing of the soot blowing solenoid valve 26. All operations are incorporated into the unit's DCS system.

[0071] Specifically, the sootblowing electric main valve 142 has two DO commands (start and close); four DI signals (valve open, closed, local / remote, and fault alarm); and it is also connected to the signals of the sootblowing pressure gauge 143 with a valve, the sootblowing pressure transmitter 144 with a valve, and multiple sootblowing solenoid valves 26.

[0072] In actual operation, there are four modes for soot blowing in flue pipe 51: the first is valve single blowing, the second is program-controlled single blowing, the third is program-controlled counter blowing, and the fourth is automatic soot blowing (including program-controlled single blowing and automatic soot blowing, and program-controlled counter blowing and automatic soot blowing).

[0073] Set the blowing time to adjustable (generally recommended to blow for 60 seconds each time) and the blowing wait time to adjustable (generally recommended to wait for 60 seconds each time).

[0074] Each soot blowing valve is equipped with "Open", "Close", "Tag", and "Reset" operation buttons.

[0075] A faulty valve can be marked as "tagged" in the DCS system. The valve will be skipped during programmable soot blowing. If the valve fault is resolved and the system needs to resume operation, a "reset" command will be executed, and the valve will participate in operation during programmable soot blowing.

[0076] During soot blowing, the soot blowing pressure can be observed in real time through the pressure transmitter's pressure indication value.

[0077] The sootblowing electric main valve is equipped with a local / remote switching button, a start button, and a stop button. Pressing the start button starts the sootblowing main valve, and the "open to the limit" indicator light illuminates when it is fully open. Pressing the stop button closes the sootblowing electric main valve, and the "closed to the limit" indicator light illuminates when it is fully closed. Pressing the local / remote switching switch switches the sootblowing electric main valve between local and remote modes, and the corresponding indicator light illuminates. If the sootblowing electric main valve malfunctions during start or stop, the fault indicator light illuminates.

[0078] 1. Single valve blowing: Local control box valve single blowing:

[0079] The local control box is equipped with operation buttons (self-locking buttons) for each soot blowing valve. Switch the local control box to "local", click the corresponding valve operation button, the valve starts, the red indicator light on the button lights up, compressed air is connected, and soot blowing begins; click the button again, the valve closes, the red indicator light on the button goes out, compressed air is turned off, and soot blowing stops.

[0080] Note: When performing manual soot blowing in the local control box, the local / remote switch of the soot blowing electric main valve needs to be switched to "local". Manually start the soot blowing electric main valve. After the soot blowing electric main valve is fully opened, manual soot blowing can be performed on each soot blowing valve. When soot blowing is finished, the soot blowing electric main valve needs to be manually closed.

[0081] DCS system valve single blow:

[0082] The DCS system's horizontal flue operation screen displays the main soot blowing valve, operation buttons and indicator lights for each soot blowing valve, and a soot blowing pressure display.

[0083] Switch the local / remote switch button on the local control box to "remote" and switch the local / remote switch button on the sootblowing electric main valve to "remote".

[0084] Click the "Open" button (pulse) on the main soot blowing valve. The main soot blowing valve will start, and the red indicator light will flash during startup. Once fully open, the red indicator light will remain on. Click the "Close" button (pulse) on the main soot blowing valve. The main soot blowing valve will start closing, and the green indicator light will flash. Once fully closed, the green indicator light will remain on. Click the "Open" button (self-locking) on ​​each soot blowing valve in sequence. Each soot blowing valve will start sequentially, and the red indicator light will illuminate. Click the "Close" button on each soot blowing valve in sequence. Each soot blowing valve will close sequentially, and the red indicator light will turn off.

[0085] 2. Programmable single-blow (sequential control)

[0086] Switch the local control box switch to "remote" and the soot blowing electric main valve switch to "remote".

[0087] On the DCS terminal, in the horizontal flue soot blowing operation screen, click the "Programmed Single Blow" operation button for the horizontal flue. First, the program automatically starts the soot blowing electric main valve. After the soot blowing electric main valve is fully open, each soot blowing valve is started and closed in sequence. After the soot blowing electric main valve is fully open, CHF01 is started first. After CHF01 blows soot for 60 seconds, CHF01 is closed. After a waiting period of 60 seconds (air tank replenishes air supply), CHF02 is started. After CHF02 blows soot for 60 seconds, CHF02 is closed. After a waiting period of 60 seconds, CHF03 is started. After CHF03 blows soot for 60 seconds, CHF03 is closed... and so on, until CHF10 blows soot for 60 seconds. After CHF10 is closed, the soot blowing electric main valve is automatically closed. After the soot blowing electric main valve is fully closed, one programmed single blow of the horizontal flue is completed.

[0088] Note: The blowing time and blowing wait time are adjustable, with an initial time of 60 seconds.

[0089] 3. Programmable counter-blowing (sequential control)

[0090] Switch the local control box switch to "remote" and the soot blowing electric main valve switch to "remote".

[0091] On the DCS terminal's horizontal flue soot blowing operation screen, click the "Programmed Counter-Blow" operation button for the horizontal flue. First, the program automatically starts the soot blowing electric main valve. After the soot blowing electric main valve is fully open, each soot blowing valve is started and closed sequentially. After the soot blowing electric main valve is fully open, CHF01 and CHF02 are started first. After CHF01 and CHF02 have been blowing soot for 60 seconds, CHF01 and CHF02 are closed. After a waiting period of 60 seconds (air tank replenishes air supply), CHF02 and CHF03 are started. After CHF02 and CHF03 have been blowing soot for 60 seconds, CHF02 and CHF03 are closed. After a waiting period of 60 seconds, and so on, until CHF09 and CHF10 have been blowing soot for 60 seconds. Then CHF09 and CHF10 are closed, and the soot blowing electric main valve is automatically closed. After the soot blowing electric main valve is fully closed, one cycle of programmed counter-blowing of the horizontal flue is completed.

[0092] Note: The blowing time and blowing wait time are adjustable, with an initial time of 60 seconds.

[0093] 4. Automatic soot blowing

[0094] Both single-blowing and counter-blowing processes in horizontal flues can achieve automatic soot blowing. The timed soot blowing interval can be set, and "single-blowing" or "counter-blowing" will be started automatically according to the set time.

[0095] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A multi-stage treatment device for ash accumulation in a boiler horizontal flue, comprising a horizontal flue (5), characterized in that, include: Insulating wall (4) is used to prevent the heat of flue gas from escaping from the horizontal flue (5); Gas source system (1) is used to provide high-pressure gas for ash treatment in horizontal flue (5); Soot blowing system (2) is used to blow ash in the horizontal flue (5) in an omnidirectional swirling motion; The control system (3) is used to control the operation of the automated components in the gas source system (1) and the soot blowing system (2); The control system (3) can control the gas source system (1) to store high-pressure gas, and at the same time control the soot blowing system (2) to disrupt the ash settling balance in the horizontal flue (5); The gas source system (1) includes a gas supply mechanism, a gas storage mechanism and a gas transmission mechanism; The soot blowing system (2) includes a flow splitting mechanism, a grouping mechanism, and an omnidirectional swirl soot blowing mechanism; The diversion mechanism includes a soot blowing main pipe (21) and multiple connecting pipes (22), which are connected to the grouping mechanism; The omnidirectional vortex soot blowing mechanism includes multiple omnidirectional vortex soot blowers (210), and the omnidirectional vortex soot blowers (210) are connected to the grouping mechanism; The omnidirectional vortex soot blower (210) includes an air guide pipe (2101), through which a jet shield (2104) is provided. The jet shield (2104) has six jet holes (2102) at equal intervals around its circumference. At one end of the air guide pipe (2101) located inside the jet shield (2104), six air guide holes (2103) are provided at equal intervals. The horizontal height of the air guide holes (2103) is higher than the horizontal height of the jet holes (2102).

2. The multi-treatment device for ash accumulation in a boiler horizontal flue according to claim 1, characterized in that: The gas storage mechanism includes a gas storage tank (11), and the two sides of the gas storage tank (11) are respectively connected to the gas supply mechanism and the gas transmission mechanism; the soot blowing header (21) is connected to the conveying mechanism; A safety valve (112) is installed at the upper end of the gas storage tank (11), a gas storage tank pressure gauge (111) is installed on one side of the gas storage tank (11), a drain pipe (13) is provided through the lower end of the gas storage tank (11), a gas storage tank drain manual secondary valve (132) is installed on the drain pipe (13), a gas storage tank drain manual primary valve (131) is installed at the end of the drain pipe (13) away from the gas storage tank (11), and a gas supply pipe (14) is provided at the end of the drain pipe (13) away from the gas storage tank (11).

3. The multi-treatment device for ash accumulation in a boiler horizontal flue according to claim 1, characterized in that: The gas supply mechanism includes a gas supply pipe (12) that runs through one side of the lower end of the gas storage tank (11). A permeable filter (121), a manual secondary valve (122), and a manual primary valve (123) are installed sequentially on the gas supply pipe (12). A miscellaneous compressed air main pipe (124) is installed at the end of the gas supply pipe (12) away from the gas storage tank (11). The manual primary valve (123) is located at the end of the gas supply pipe (12) near the miscellaneous compressed air main pipe (124).

4. The multi-treatment device for ash accumulation in a boiler horizontal flue according to claim 1, characterized in that: The gas supply mechanism includes a gas supply pipe (14) installed on one side of the upper end of the gas storage tank (11). One end of the gas supply pipe (14) is connected to the soot blowing main pipe (21). The gas supply pipe (14) is equipped with a manual soot blowing main valve (141), an electric soot blowing main valve (142), a soot blowing pressure gauge (143) with a valve, and a soot blowing pressure transmitter (144) with a valve in sequence from the gas storage tank (11) to the soot blowing main pipe (21).

5. The multi-treatment device for ash accumulation in a boiler horizontal flue according to claim 1, characterized in that: The diversion mechanism includes multiple wired short connectors (23) that are installed through the soot blowing main pipe (21). One end of the wired short connector (23) is fixedly connected to a manual soot blowing valve (24). One end of the manual soot blowing valve (24) is fixedly connected to a union (25). One end of the union (25) is fixedly connected to a soot blowing solenoid valve (26). One end of the soot blowing solenoid valve (26) is connected to a wired metal connecting hose (27). The connecting pipe (22) is connected to the end of the wired metal connecting hose (27) away from the soot blowing solenoid valve (26).

6. The multi-treatment device for ash accumulation in a boiler horizontal flue according to claim 1, characterized in that: The grouping mechanism includes two soot blowing manifolds (28) that are installed through the connecting pipe (22). Two soot blowing pipes (29) are installed through the soot blowing manifolds (28). The soot blowing pipes (29) are installed through the horizontal flue (5). Multiple omnidirectional vortex soot blowers (210) are arranged in groups of four. Multiple groups of omnidirectional vortex soot blowers (210) are installed on multiple soot blowing pipes (29).

7. The multi-treatment device for ash accumulation in a boiler horizontal flue according to claim 1, characterized in that: The horizontal flue (5) includes a flue pipe (51), and a horizontal flue heat exchanger (6) is installed inside the flue pipe (51). The grouping mechanism and multiple omnidirectional swirl soot blowers (210) are installed inside the horizontal flue heat exchanger (6). One end of the flue pipe (51) is equipped with a flue anti-wear protective tile (52), and the other end of the flue anti-wear protective tile (52) is provided with four protective steel plates (53) at equal intervals. The two jet holes (2102) on one side of the protective steel plate (53) are in a blocked state.

8. The multi-treatment device for ash accumulation in a boiler horizontal flue according to claim 1, characterized in that: The control system (3) is equipped with a soot blowing valve module and a soot blowing main valve module. The soot blowing valve module is equipped with an open button, a close button, a tag button and a reset button. The soot blowing main valve module is equipped with a local / remote switching button, a start button, and a stop button.

9. A multi-stage treatment device for ash accumulation in a boiler horizontal flue according to claim 7, characterized in that: The distance between the lowest jet hole (2102) and the lower end of the horizontal flue heat exchanger (6) is greater than 120 mm.

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