Device for purging oxide skin of pipe on heating surface of boiler

Abstract

The utility model discloses a device for purging oxide skin of a pipe on a heating surface of a boiler, which is arranged on an outlet section of a main steam pipeline or a reheat steam pipeline, and comprises an air exhaust purging pipeline, an air exhaust purging pipeline, an air exhaust purging pipeline, an air exhaust purging pipeline and an air exhaust purging pipeline, and the inlet section of the air exhaust purging pipeline is communicated with the outlet section of the main steam pipeline or the reheat steam pipeline; the shut-off valve is arranged on the air exhaust purging pipeline and is close to the inlet section of the air exhaust purging pipeline; the blowing dust collection silencer is arranged on the roof of the boiler room and is communicated with the outlet section of the air exhaust blowing pipeline; and the fixing device is connected with the air exhaust purging pipeline and is fixedly connected with a steel frame layer above the boiler. Impurities such as oxide skin on the high-temperature heating surface of the boiler can be blown out of the boiler, so that the impurities are prevented from entering equipment such as a low-pressure cylinder and a condenser in a downstream steam turbine, hidden dangers such as over-temperature pipe explosion possibly caused by accumulation of the oxide skin on the high-temperature heating surface are avoided, and the operation safety of the unit boiler is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power station boilers, and more specifically, to a device for purging oxide scale from heating surface tubes of boilers. Background Art

[0002] Conventional supercritical unit boilers and turbines in power plants are generally equipped with high-pressure bypass systems and low-pressure bypass systems. During the startup of the unit, before the turbine is turned on, the safe operation of the boiler reheat system can be protected by opening the high- and low-pressure bypass pipes of the turbine. The system will purge some of the oxide scale and other impurities generated by the main steam system and the reheat steam system to the downstream turbine medium- and low-pressure cylinders and condensers and other equipment, which will have an adverse effect on the downstream equipment and affect the economic and safe operation of the equipment; at the same time, due to insufficient purge momentum, larger-sized oxide scale and other impurities cannot be taken out of the boiler system. As time accumulates, they clog the high-temperature heating surface elbows and other parts, resulting in over-temperature pipe bursts, which bring safety hazards to the operation of the boiler. For example, the patent with application number 201920890146.6 discloses an oxide scale purging structure for high-temperature steam pipes of power station boilers, which is used in normal shutdown procedures. On this basis, by shutting down the steam turbine, the high-pressure bypass, low-pressure bypass, high-pressure bypass regulating valve and low-pressure bypass regulating valve are used to control the cooling rate of the boiler, so that the oxide scale is in a small amount, multiple times, small particles and actively peeled off, and then most of the peeled oxide scale is blown out of the boiler in batches with steam; when the unit is started, a small amount of oxide scale that falls off after complete shutdown and cooling is blown out of the boiler through the high-pressure bypass, low-pressure bypass, high-pressure bypass regulating valve and low-pressure bypass regulating valve to achieve the blowing of the oxide scale in the high-temperature steam pipe. Although it blows the oxide scale out of the boiler, it enters the downstream equipment such as the medium and low-pressure cylinders and condenser of the steam turbine, which has an adverse effect on the downstream equipment, affecting the economic and safe operation of the equipment, and it is impossible to achieve the blowing of oxide scale with larger particle size. Summary of the Invention

[0003] An object of the present invention is to solve at least the above problems and / or disadvantages and to provide at least the advantages to be described hereinafter.

[0004] The purpose of the utility model is to provide a device for purging oxide scale from the heating surface tubes of a boiler. In view of the defects in the prior art, a purging device is provided on the outlet section of the main steam pipe or the reheat steam pipe, so that oxide scale and other impurities on the high-temperature heating surface of the boiler can be purged out of the boiler system, thereby preventing them from entering the low-pressure cylinders and condenser of downstream steam turbines, and preventing the potential risks of overheating and tube bursting caused by the accumulation of oxide scale on the high-temperature heating surface, thereby improving the operating safety of the heating surface of the unit boiler.

[0005] In order to achieve the purpose and other advantages of the present invention, a device for purging oxide scale from heating surface tubes of a boiler is provided, which is arranged on the outlet section of a main steam pipe or a reheat steam pipe, and comprises:

[0006] an air exhaust steam purge pipe, the inlet section of which is connected to the outlet section of the main steam pipe or the reheat steam pipe through a pipe seat;

[0007] a shut-off valve, which is arranged on the air exhaust steam purge pipe and is arranged near the inlet section of the air exhaust steam purge pipe;

[0008] a purge dust collecting silencer, which is arranged on the roof of the boiler room and is connected to the outlet section of the air exhaust purge pipe;

[0009] The fixing device is connected to the air exhaust steam purge pipe and is fixedly connected to the steel frame layer above the boiler to achieve its fixing effect on the air exhaust steam purge pipe.

[0010] Preferably, the shut-off valve includes a first shut-off valve and a second shut-off valve, and the first shut-off valve and the second shut-off valve are arranged in sequence along the direction of the air exhaust steam purge pipeline, and the first shut-off valve and the second shut-off valve are both full-pressure shut-off valves.

[0011] Preferably, the device for achieving scale purging of boiler heating surface tubes further comprises:

[0012] A limiting device is provided on the air exhaust steam purge pipe and is located between the shut-off valve and the purge dust collecting silencer. The arrangement position and arrangement quantity of the limiting device are determined according to the arrangement and flexibility analysis of the air exhaust steam purge pipe.

[0013] Preferably, the purge dust collector silencer is a vertical inner and outer double-layer dust collector silencer, wherein the inner layer of the vertical inner and outer double-layer dust collector silencer is a silencer, and the outer layer is a shell assembly, and the bottom of the vertical inner and outer double-layer dust collector silencer is provided with a drain hole and a slag discharge hole, and a drain pipe is provided on the drain hole.

[0014] Preferably, the fixing device is a double-pull rod constant force spring hanger, which fixes the air exhaust steam purge pipe on the steel frame layer above the boiler.

[0015] Preferably, the air exhaust steam purge pipe is a vertically arranged pipe.

[0016] Preferably, the air exhaust steam purge pipe is a horizontally and vertically arranged pipe with multiple elbows, wherein the shut-off valve is arranged on the horizontal section of the inlet section of the air exhaust steam purge pipe, and an operating platform is provided near the horizontal section.

[0017] The utility model has at least the following beneficial effects:

[0018] First, the utility model is used to realize the device of purging oxide scale of boiler heating surface tubes. By arranging an air exhaust purge pipe on the outlet section of the main steam pipe or the reheat steam pipe, the oxide scale and other impurities on the high-temperature heating surface of the boiler are purged out of the boiler system when the boiler is started and before it is shut down, thereby preventing the impurities from entering the downstream equipment such as the medium and low-pressure cylinders and condenser of the steam turbine, and avoiding the hidden dangers such as overheating and tube burst caused by the accumulation of oxide scale on the high-temperature heating surface, thereby improving the operating safety of the heating surface of the unit boiler.

[0019] Secondly, the device of the utility model for achieving scale purging of boiler heating surface tubes is provided with a purge dust collecting silencer at the outlet section of the air exhaust purge pipe, so that impurities such as scale can be directly purged into the purge dust collecting silencer and discharged through the slag discharge hole at the bottom of the purge dust collecting silencer, which is convenient and efficient.

[0020] Third, the device for achieving scale purging of boiler heating surface tubes of the utility model fixes the air exhaust purge pipe to the steel beam of the nearby steel structure through a fixing device, thereby dispersing the force of the entire purge device on the main steam pipe or the reheat steam pipe.

[0021] Fourth, the device of the utility model for achieving scale purging of boiler heating surface tubes greatly reduces the amount of scale and other impurities carried to the turbine and condenser, thereby protecting the turbine and maintaining efficient operation of the turbine, and also protecting the condenser for long-term safe operation, reducing the workload of cutting and cleaning pipes due to scale accumulation during boiler unit maintenance, and can additionally realize the air exhaust function when the boiler unit is started, thereby increasing the unit startup speed.

[0022] Other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of a device for achieving scale purging of boiler heating surface tubes in one embodiment of the utility model;

[0024] Figure 2 This is a schematic structural diagram of a dust collecting muffler in a device for purging oxide scale from heating surface tubes of a boiler according to an embodiment of the present invention;

[0025] Figure 3 This is a schematic structural diagram of a fixing device in a device for achieving scale purging of boiler heating surface tubes according to an embodiment of the utility model;

[0026] Figure markings: 1: main steam pipe or reheat steam pipe outlet section, 2: air exhaust purge pipe, 3: first shut-off valve, 4: second shut-off valve, 5: purge dust collector silencer, 500: shell assembly, 510: silencer, 520: slag discharge hole, 530: drain hole, 531: drain pipe, 6: limiting device, 7: fixing device, 700: vertical pipe clamp, 710: double-hole connecting plate, 720: U-shaped nut, 730: hexagonal nut, 740: double pull rod, 750: double-hole double-ear plate connecting vertical constant suspension, 760: single-ear suspension plate. DETAILED DESCRIPTION

[0027] The present invention will be described in further detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0028] It should be understood that terms such as "having," "comprising," and "including" used in the embodiments of this application do not exclude the presence or addition of one or more other elements or combinations thereof. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are intended only to explain the relative positional relationships and movement of components in a specific posture. If the specific posture changes, the directional indications will also change accordingly. When an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element through an intervening element. References to "first," "second," etc. in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features designated as "first" or "second" may explicitly or implicitly include at least one of such features.

[0029] It should be noted that the technical solutions between the various embodiments of the present application can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0030] like Figures 1 to 3 The utility model provides a device for achieving scale purging of boiler heating surface tubes, which is arranged on the outlet section of the main steam pipe or the reheat steam pipe, and the device comprises:

[0031] An air exhaust steam purge pipe 2, the inlet section of which is connected to the outlet section 1 of the main steam pipe or the reheat steam pipe through a pipe seat;

[0032] A shut-off valve is provided on the air exhaust steam purge pipe 2 and is arranged near the inlet section of the air exhaust steam purge pipe 2. The shut-off valve includes a valve body and an actuator;

[0033] A purge dust collecting silencer 5 is provided on the roof of the boiler room and is connected to the outlet section of the air exhaust purge pipe 2;

[0034] The fixing device 7 is connected to the air exhaust steam purge pipe 2 and is fixedly connected to the steel frame layer above the boiler.

[0035] In the above technical solution, the air exhaust steam purge pipe 2 is arranged on the outlet section of the main steam pipe or the reheat steam pipe, and the opening and stopping of the air exhaust steam purge pipe 2 for purging impurities such as oxide scale on the main reheat steam system pipes in the boiler system is controlled by the shut-off valve. The purge dust collecting silencer 5 is arranged on the roof of the boiler room and directly welded to the steel frame of the roof to realize the air discharge of impurities such as oxide scale on the main reheat steam system pipes to the outside of the boiler room and enter the purge dust collecting silencer 5 for further discharge. The air exhaust steam purge pipe 2 is fixed to the steel beam arranged above the boiler room by the fixing device 7. Among them, the inlet section of the air exhaust steam purge pipe 2 and the exhaust pipe seat on the outlet section 1 of the main steam pipe or the reheat steam pipe are butt-welded, and the outlet section of the air exhaust steam purge pipe 2 is butt-welded to the purge dust collecting silencer 5, and the purge dust collecting silencer 5 directly exhausts steam to the air; the design pressure of the purge dust collecting silencer 5 is selected according to the full pressure, and is consistent with the design pressure of the connected air exhaust steam purge pipe 2; the setting position of the shut-off valve is as close as possible to the platform set at the inlet section of the air exhaust steam purge pipe 2, which is convenient for operation and maintenance, and an operating platform can also be added according to the on-site conditions.

[0036] In this technical solution, the working principle of the purge is as follows: before the boiler unit is shut down and the steam pressure drops to the upper limit of the purge pressure, the shutoff valve is opened to start the purge. The steam pressure is not reduced to the lower limit of the purge pressure, at which point the shutoff valve is closed and the purge is stopped. The boiler is then pressurized to increase the steam pressure. When the steam pressure reaches the upper limit of the purge pressure, the shutoff valve is opened again to start the purge. The steam pressure is not reduced to the lower limit of the purge pressure, at which point the shutoff valve is closed and the purge is stopped. This process is repeated multiple times to achieve the function of purging impurities such as scale from the pipes of the main reheat steam system to the air. Before the unit is started and connected to the grid, when the steam pressure drops to the upper limit of the purge pressure, the shutoff valve is opened to start the purge. The steam pressure is not reduced to the lower limit of the purge pressure, at which point the shutoff valve is closed and the purge is stopped. The boiler is then pressurized to increase the steam pressure. When the steam pressure reaches the upper limit of the purge pressure, the shutoff valve is opened again to start the purge. The steam pressure is not reduced to the lower limit of the purge pressure, at which point the shutoff valve is closed and the purge is stopped. This process is repeated several times to purge impurities such as oxide scale on the pipes of the main reheat steam system to the air exhaust steam.

[0037] This technical solution can be used to blow out impurities such as oxide scale on the high-temperature heating surface of the boiler from the boiler system, thereby preventing it from entering the downstream equipment such as the medium and low-pressure cylinders and condenser of the turbine, and avoiding potential risks such as overheating and tube bursting caused by the accumulation of oxide scale on the high-temperature heating surface, thereby improving the operating safety of the unit boiler heating surface.

[0038] In another technical solution, the shut-off valve includes a first shut-off valve 3 and a second shut-off valve 4, which are arranged sequentially along the direction of the air exhaust steam purge pipeline 2, and the first shut-off valve 3 and the second shut-off valve 4 are both full-pressure shut-off valves.

[0039] In the above technical solution, two shut-off valves are provided near the inlet section of the exhaust steam purge pipe 2 to prevent any of the shut-off valves from affecting the normal operation of the entire boiler system and the normal implementation of the exhaust steam purge of impurities such as scale on the main reheat steam system pipes. The operation steps of the two shut-off valves in the device for purging scale on the boiler heating surface pipes are as follows: before the unit is shut down and at low load, when the steam pressure drops below the upper limit of the purge pressure, the second shut-off valve 4 and the first shut-off valve 3 are opened in sequence to start the purge. The first shut-off valve 3 and the second shut-off valve 4 are closed before the steam pressure drops to the lower limit of the allowable purge pressure, and the purge is stopped. The boiler is pressurized to increase the steam pressure. When the steam pressure reaches the upper limit of the purge pressure, the second shut-off valve 4 and the first shut-off valve 3 are opened in sequence to continue the purge. The first shut-off valve 3 and the second shut-off valve 4 are closed before the steam pressure drops to the lower limit of the allowable purge pressure, and the purge is stopped. This process is repeated many times to achieve the function of purging impurities such as oxide scale on the pipes of the main reheat steam system to the exhaust steam.

[0040] The system for achieving the function of purging oxide scale from boiler heating surface tubes is as follows: before the unit is started and connected to the grid, when the steam pressure drops to the upper limit of the purge pressure, the second shut-off valve 4 and the first shut-off valve 3 are opened in sequence to start purging. The first shut-off valve 3 and the second shut-off valve 4 are closed before the steam pressure drops to the lower limit of the allowable purge pressure, and the purge is stopped. The boiler is pressurized to increase the steam pressure. When the steam pressure reaches the upper limit of the purge pressure, the second shut-off valve 4 and the first shut-off valve 3 are opened in sequence to continue purging. The first shut-off valve 3 and the second shut-off valve 4 are closed before the steam pressure drops to the lower limit of the allowable purge pressure, and the purge is stopped. This purge process is repeated multiple times to achieve the function of purging oxide scale and other impurities from the tubes of the main reheat steam system to the air exhaust steam.

[0041] In another technical solution, the device for achieving scale purging of boiler heating surface tubes further comprises:

[0042] The limiting device 6 is provided on the air exhaust steam purge pipe 2 and is located between the shut-off valve and the purge dust collecting muffler 5 .

[0043] In the above technical solution, the limiting device 6 is mainly determined based on the layout direction of the air exhaust steam purge pipe 2 and the layout of the purge dust collecting silencer 5 to determine whether to use the limiting device 6 and the setting position and number of the limiting device 6. When the air exhaust steam purge pipe 2 is arranged vertically upward through two steel frame layers with an elevation of 82.8 meters and an elevation of 90.4 meters, and then to the large plate beam with an elevation of 94.4 meters, and finally to the purge dust collecting silencer 5 arranged on the boiler roof, at this time, the purge dust collecting silencer 5 selects a vertical inner and outer double-layer type dust collecting silencer directly welded to the roof steel frame. It cannot absorb horizontal displacement, and a limiting device 6 needs to be set to limit the horizontal displacement of the air exhaust steam purge pipe 2. The limiting device 6 is selected to be set at the steel frame layer with an elevation of 82.8 meters. The limiting device 6 is made of channel steel, H-shaped steel, unlocking and welding. The purge dust collecting silencer 5 absorbs vertical displacement, and the horizontal direction is limited by the limiting device. When the air exhaust steam purge pipe 2 cannot run in a straight vertical direction due to spatial limitations of the boiler room and needs to be arranged with multiple curved sections, the horizontal section of the air exhaust steam purge pipe 2 is supported and suspended by a sliding spring support. The air exhaust steam purge pipe 2 with this arrangement can absorb three-way expansion displacement and the limiting device 6 does not need to be set.

[0044] In another technical solution, Figure 2 As shown, the purge dust collector silencer 5 is a vertical inner and outer double-layer dust collector silencer, wherein the inner layer of the vertical inner and outer double-layer dust collector silencer is a silencer 510, and the outer layer is a shell assembly 500. The bottom of the vertical inner and outer double-layer dust collector silencer is provided with a drain hole 530 and a slag discharge hole 520, and a drain pipe 531 is provided on the drain hole 530.

[0045] In the above technical solution, the structure and model of the purge dust muffler 5 are selected based on its installation location, that is, the size of the roof layout space and user requirements. The use of a vertical inner and outer double-layer dust muffler can save installation space, but it does not rule out the use of a horizontal inner and outer double-layer dust muffler when the roof layout space is large. The inner layer of the vertical inner and outer double-layer dust muffler is a stainless steel SUS304 silencer 510, and the outer layer is a shell assembly 500. The soundproofing wall uses a certain thickness of sound-absorbing material rock wool. The bottom of the vertical inner and outer double-layer dust muffler is provided with a drain hole 530, and a drain pipe 531 of a certain length is welded to the drain hole 530 for drainage. The bottom of the vertical inner and outer double-layer dust muffler is also provided with a slag discharge hole 520. The slag discharge hole 520 is regularly inspected and cleaned according to the use of the vertical inner and outer double-layer dust muffler. The noise reduction of the purge dust muffler 5 meets the industrial noise control design standards. The design and manufacture of the purge dust collection silencer 5 meets the "Pressure Vessel" standard and the "Technical Specifications for Exhaust Mufflers in Thermal Power Plants." Once installed, the purge dust collection silencer 5 does not affect boiler safety and reliability and meets exhaust volume requirements. The total exhaust volume of the purge dust collection silencer 5 meets the requirement that the purge momentum ratio is greater than 1.

[0046] In another technical solution, the fixing device 7 is a double-pull rod constant force spring hanger, which fixes the air exhaust steam purge pipe 2 on the steel frame layer above the boiler.

[0047] In the above technical solution, the structural selection of the fixing device 7 is determined based on the arrangement of the exhaust steam purge pipe 2 and the stress flexibility analysis of the exhaust steam purge pipe 2 to determine the structural type of the necessary support or suspension fixing device; when the exhaust steam purge pipe 2 is arranged vertically upward through two steel frame layers with an elevation of 82.8 meters and an elevation of 90.4 meters, and then to the large plate beam with an elevation of 94.4 meters and finally to the purge dust collecting silencer 5 arranged on the boiler roof, the fixing device uses a double-rod constant force spring hanger, such as Figure 3As shown, it includes: a vertical pipe clamp 700, a double-hole connecting plate 710, a U-shaped nut 720, a hexagonal nut 730, a double-pull rod 740, a double-hole double-ear plate connecting vertical permanent hanger 750, and a single-ear hanger plate 760. The vertical pipe clamp 700, double-hole connecting plate 710, U-shaped nut 720, and hexagonal nut 730 are used to fix the exhaust steam purge pipe 2, and the double-pull rod 740, double-hole double-ear plate connecting vertical permanent hanger 750 and single-ear hanger plate 760 are used to fix the exhaust steam purge pipe 2 to the steel beam on the upper steel frame layer. When the exhaust steam purge pipe 2 cannot run straight vertically due to spatial limitations of the boiler room and needs to be arranged with multiple curved sections, the horizontal section of the exhaust steam purge pipe 2 inlet is supported by a sliding spring support, and the vertical section of the exhaust steam purge pipe 2 is suspended by a rigid hanger.

[0048] In another technical solution, the air exhaust steam purge pipe 2 is a vertically arranged pipe.

[0049] In the above technical solution, when the exhaust steam purge pipe 2 is arranged in a straight line without any obstruction, the exhaust steam purge pipe 2 is a straight pipe that runs vertically upward through two steel frame layers at an elevation of 82.8 meters and 90.4 meters, then to the large plate beam at an elevation of 94.4 meters, and finally to the purge dust collection silencer 5 installed on the boiler roof; wherein, the design pressure of the inlet section of the exhaust steam purge pipe 2 is 29.3 MPa, and the design pressure of the inlet section of the main steam pipe or reheat steam pipe is 5.66 MPa; the design pressure of the outlet section of the exhaust steam purge pipe 2 is 9 MPa, and the design pressure of the outlet section of the main steam pipe or reheat steam pipe is 3 MPa. Therefore, the design pressure and design temperature of the exhaust steam purge pipe 2 are reasonably selected according to the steam parameters of the operating conditions, and sufficient margin is left for the design pressure and design temperature.

[0050] In another technical solution, the inlet section of the air exhaust steam purge pipe 2 is connected to the pipe joint on the end of the main steam outlet header or the end of the reheat steam outlet header. The main steam outlet header is located upstream of the main steam pipe and is connected thereto, and the reheat steam outlet header is located upstream of the reheat steam pipe and is connected thereto.

[0051] In another technical solution, the air exhaust steam purge pipe 2 is a horizontally and vertically arranged pipe with multiple elbows, wherein the shut-off valve is arranged on the horizontal section of the inlet section of the air exhaust steam purge pipe, and an operating platform is provided near the horizontal section.

[0052] In the above technical solution, when the air exhaust steam purge pipe 2 is arranged in a straight line and is blocked, it is necessary to set multiple elbows at the blocking position according to the on-site equipment. At this time, the inlet section of the air exhaust steam purge pipe 2 is butt-welded to the exhaust pipe seat on the outlet section of the main steam pipe or the reheated steam pipe. The air exhaust steam purge pipe 2 is first arranged vertically, then horizontally, and then vertically upward. A U-shaped bend is set on the air exhaust steam purge pipe 2. The horizontal section of the inlet section of the air exhaust steam purge pipe 2 is arranged near the platform. The first shut-off valve 3 and the second shut-off valve 4 are arranged on the horizontal section of the inlet section of the air exhaust steam purge pipe 2 for easy maintenance.

[0053] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with this field, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A device for purging oxide scale from boiler heating surface tubes, characterized in that: The device is arranged on the outlet section of the main steam pipeline or the reheat steam pipeline, and comprises: an air exhaust steam purge pipe, the inlet section of which is connected to the outlet section of the main steam pipe or the reheat steam pipe through a pipe seat; a shut-off valve, which is arranged on the air exhaust steam purge pipe and is arranged near the inlet section of the air exhaust steam purge pipe; a purge dust collecting silencer, which is arranged on the roof of the boiler room and is connected to the outlet section of the air exhaust purge pipe; A fixing device is connected to the air exhaust steam purge pipe and is fixedly connected to the steel frame layer above the boiler.

2. The device for achieving scale purging of boiler heating surface tubes according to claim 1, characterized in that: The shut-off valve includes a first shut-off valve and a second shut-off valve, which are arranged sequentially along the direction of the air exhaust steam purge pipeline. The first shut-off valve and the second shut-off valve are both full-pressure shut-off valves.

3. The device for achieving scale purging of boiler heating surface tubes according to claim 1, characterized in that: Also includes: A limiting device is provided on the air exhaust steam purge pipe and is located between the shut-off valve and the purge dust collecting silencer. The arrangement position and arrangement quantity of the limiting device are determined according to the arrangement and flexibility analysis of the air exhaust steam purge pipe.

4. The device for achieving scale purging of boiler heating surface tubes according to claim 1, characterized in that: The purge dust collector silencer is a vertical double-layer dust collector silencer, wherein the inner layer of the vertical double-layer dust collector silencer is a silencer, and the outer layer is a shell assembly. The bottom of the vertical double-layer dust collector silencer is provided with a drain hole and a slag discharge hole, and a drain pipe is provided on the drain hole.

5. The device for achieving scale purging of boiler heating surface tubes according to claim 1, characterized in that: The fixing device is a double-pull rod constant force spring hanger, which fixes the air exhaust steam purge pipe on the steel frame layer above the boiler.

6. The device for purging oxide scale from heating surface tubes of a boiler according to claim 1, characterized in that: The air exhaust steam purge pipe is a vertically arranged pipe.

7. The device for purging oxide scale from heating surface tubes of a boiler according to claim 1, characterized in that: The air exhaust steam purge pipeline is a horizontally and vertically arranged pipeline with multiple elbows, wherein the shut-off valve is arranged on the horizontal section of the inlet section of the air exhaust steam purge pipeline, and an operating platform is provided near the horizontal section.

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