Reducing atmosphere tube socket anti-blocking and sealing system and using method thereof

Abstract

The invention provides a reducing atmosphere tube seat anti-blocking and sealing system which comprises a tube seat, the tube seat is connected to the outer side face of a boiler water cooling wall, and an ash removal assembly is connected to the tube seat; the ash removal assembly comprises a driving air cylinder, a telescopic head of the driving air cylinder is connected with an ash removal rod, and the ash removal rod extends to a port, connected with the detection hole, in the pipe base; the driving air cylinder is in signal connection with a controller, a flue gas return pipe is arranged on the pipe seat, a port at the other end of the flue gas return pipe is communicated with the pipe seat, and a front-stage air sealing ring and a rear-stage air sealing ring are mounted on two sides of the port of the flue gas return pipe in the pipe seat; and an exhaust pipe is arranged on the pipe seat. According to the system provided by the invention, the ash removal rod is arranged in the pipe seat, and accumulated ash and coke blocks at the pipe orifice of the water cooling wall are removed through the ash removal rod; in the gas path switching assembly, arc-shaped ventilation channels in a front-stage air sealing ring and a rear-stage air sealing ring form a Sara valve sealing structure with the inner wall of the tube seat and the outer wall of the ash removal rod, so that smoke backflow is avoided, and the smoke detection precision is not affected.

Description

Technical Field

[0001] The invention belongs to the technical field of reducing atmosphere detection, and in particular to a reducing atmosphere pipe seat anti-blocking and sealing system and a use method thereof. Background Art

[0002] In coal-fired power plants, boilers are one of the three main equipment of coal-fired units and are key equipment to ensure the safe operation of power plants. However, boilers face many threats in actual operation. Among them, high-temperature corrosion of water-cooled walls is a common and extremely harmful one. In recent years, in order to meet the increasingly stringent NOX emission standards, domestic coal-fired units have adopted furnace air staged combustion technology. With the improvement of air staged degree, a thick reducing atmosphere is formed in the burner area. In addition, due to the tight coal market, a large number of units burn low-heat high-sulfur coal, which further increases the reducing atmosphere, causing the high-temperature corrosion of water-cooled walls to deteriorate sharply. When high-temperature corrosion is severe, "tube bursting" often occurs, which seriously affects the safe operation and economic benefits of power plants. According to statistics, the number of unplanned shutdown hours caused by water-cooled wall tube bursts in my country's thermal power units accounts for about 37.8% of the total unplanned shutdown time of the units throughout the year. In order to prevent the occurrence of the above phenomena and situations, the reducing atmosphere in the water-cooled wall is usually detected by detecting the reducing atmosphere in the boiler water-cooled wall.

[0003] At present, the detection of reducing atmosphere in the existing boiler water-cooled wall is carried out by opening a detection hole in the water-cooled wall, then welding a detection tube on the detection hole, connecting a sealing cap to the end of the detection tube, and when detecting the reducing atmosphere in the boiler, the sealing cap is removed and a gas detector is connected to the end of the detection tube; then, during the long-term use of the boiler water-cooled wall, the detection tube is susceptible to corrosion, and attachments such as rust and scale are produced, which are deposited in the detection tube to form dust and coke blocks, causing blockage of the detection tube, affecting the detection of the reducing atmosphere, and making it difficult to measure the reducing atmosphere in the boiler water-cooled wall online. Summary of the invention

[0004] In order to solve the problem in the prior art that the detection tube for detecting reducing atmosphere arranged on the boiler water-cooled wall is easily blocked during long-term use, making it difficult to measure the reducing atmosphere in the boiler water-cooled wall online, the present invention provides a reducing atmosphere pipe seat anti-blocking and sealing system and a use method thereof.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] The present invention provides a reducing atmosphere pipe seat anti-blocking and sealing system, comprising a pipe seat, one end of which is fixedly connected to a detection hole opened on the outer surface of a boiler water-cooled wall, and the other end of which is connected to a dust cleaning component;

[0007] The dust cleaning component includes a driving cylinder, the telescopic head end of the driving cylinder is connected to the end of the pipe seat, the telescopic head of the driving cylinder is connected to a dust cleaning rod, the dust cleaning rod extends to the port in the pipe seat connected to the detection hole, and the signal on the driving cylinder is connected to a controller;

[0008] A flue gas return pipe is arranged on the pipe seat, and the other end port of the flue gas return pipe is connected to the pipe seat, a front-stage air sealing ring is installed on one side of the flue gas return pipe port in the pipe seat, and a rear-stage air sealing ring is installed on the other side of the flue gas return pipe port in the pipe seat, arc-shaped ventilation channels are arranged in the front-stage air sealing ring and the rear-stage air sealing ring, and a Sla valve sealing structure is formed between the arc-shaped ventilation channel and the inner wall of the pipe seat and the outer wall of the cleaning rod; an exhaust pipe for discharging flue gas is arranged on the end of the pipe seat close to the cleaning component.

[0009] Preferably, the controller signal is connected to a gas circuit switching component, the gas circuit switching component is connected to a smoke detection component, and the smoke detection component is connected to one end of the smoke return pipe;

[0010] The gas circuit switching assembly comprises a gas-smoke switching valve, the gas-smoke switching valve is connected to a compressed air main valve and a heat dissipation assembly, and the heat dissipation assembly is communicated with the pipe seat;

[0011] The gas and smoke switching valve is connected to the smoke detection component, and the gas and smoke switching valve and the compressed air main valve signal are connected to the controller.

[0012] Preferably, the gas and smoke switching valve is a three-way solenoid valve.

[0013] Preferably, a cylinder control valve is connected to one end of the compressed air main valve connected to the gas and smoke switching valve, and the cylinder control valve is connected to the driving cylinder to provide an operating air source for the driving cylinder.

[0014] Preferably, the compressed air main valve is a two-way solenoid valve.

[0015] Preferably, the cylinder control valve is a three-way solenoid valve.

[0016] Preferably, the heat dissipation component includes a bypass, which is arranged on the tube seat, one end interface of the bypass is connected to the tube seat, the other end interface of the bypass is connected to the gas and smoke switching valve, and heat dissipation fins are arranged on the outer wall of the bypass.

[0017] Preferably, the smoke detection component comprises a diaphragm pump, the air inlet of the diaphragm pump is connected to the gas-smoke switching valve, the air outlet of the diaphragm pump is connected to an analysis instrument and a check valve, and the check valve is connected to the smoke return pipe.

[0018] Preferably, a manual regulating valve is connected to the side of the check valve that is in communication with the smoke return pipe.

[0019] The present invention also discloses a method for using a reducing atmosphere pipe seat anti-blocking and sealing system, which is used to control the above system, and comprises the following steps:

[0020] Step 1, sequentially setting the start and stop time of the compressed air main valve, the cylinder control valve, the diaphragm pump and the gas and smoke switching valve in the controller, and setting the switching time of the gas and smoke switching valve in the controller;

[0021] Step 2, the controller opens the compressed air main valve and the cylinder control valve based on the set start and stop time, the cylinder control valve controls the drive cylinder to start, and drives the ash cleaning rod to puncture and crush the coked ash and coke blocks at the connection port between the tube seat and the water-cooled wall; the gas and smoke switching valve is opened based on the set start and stop time, and compressed air flows into the connection port between the tube seat and the water-cooled wall from the bypass to blow out the crushed ash and coke blocks;

[0022] Step 3, the controller closes the cylinder control valve based on the set start and stop time to restore the driving cylinder to an initial state, the controller closes the compressed air main valve based on the set start and stop time, and the controller closes the gas and smoke switching valve based on the set start and stop time;

[0023] Step 4, the controller switches the gas-smoke switching valve based on the set switching time, closes the gas passage between the compressed air main valve and the bypass, and switches to the gas passage between the bypass and the diaphragm pump. The controller starts the diaphragm pump based on the set start-stop time. The diaphragm pump extracts flue gas and flows through the pipe seat, the bypass, and the gas-smoke switching valve in sequence. After passing through the diaphragm pump, the flue gas is divided into two paths and flows to the analysis instrument and the check valve respectively. The flue gas flowing through the check valve flows to the manual regulating valve and the flue gas return pipe. The flue gas flowing through the check valve is adjusted to reach a preset opening to generate resistance. The flue gas flows through the flue gas return pipe and enters the sealed middle chamber. Based on the action of the front-stage air sealing ring, the flue gas is discharged from the exhaust pipe;

[0024] Step 5: After the analytical instrument has completed the detection, the controller turns off the diaphragm pump and the gas and smoke switching valve based on the set start and stop time.

[0025] Compared with the prior art, the present invention has the following beneficial technical effects:

[0026] The present invention provides a reducing atmosphere pipe seat anti-blocking and sealing system. The system provided by the present invention installs the sampling pipe seat upward after the vertical water-cooled wall is opened, so as to prevent the accumulation of dust and coke blocks in the pipe seat to the greatest extent. There is a cleaning rod inside the pipe seat, and the tail end is connected to the driving cylinder. In the non-test state, the driving cylinder is controlled by a controller to drive the cleaning rod to disturb and remove the dust and coke blocks at the water-cooled wall pipe mouth. When testing the flue gas, the flue gas is detected through the gas path switching component and the flue gas detection component. The gas path switching component forms a Sla valve sealing structure through the arc-shaped ventilation channel in the front-stage air sealing ring and the rear-stage air sealing ring and the space between the inner wall of the pipe seat and the outer wall of the cleaning rod, so as to discharge the flue gas from the exhaust pipe and prevent the flue gas from flowing back into the pipe seat, thereby affecting the detection accuracy of the flue gas.

[0027] Furthermore, in the system provided by the present invention, an air circuit switching component is provided, in which a compressed air main valve is connected to the air smoke switching valve, the compressed air main valve is connected to the cylinder control valve, and the compressed air main valve and the cylinder control valve signals are connected to a controller, and the opening and closing of the compressed air main valve and the cylinder control valve are controlled by the controller to respectively drive the cylinder to deliver a working air source and to deliver compressed air to the pipe seat, so as to purge the accumulated dust and coke blocks removed from the water-cooled wall pipe mouth, thereby improving the efficiency of removing the accumulated dust and coke blocks from the water-cooled wall pipe mouth.

[0028] Furthermore, the heat dissipation component in the system provided by the present invention includes a bypass, and heat dissipation fins are arranged on the bypass. The high-temperature flue gas flowing through the bypass is cooled by the heat dissipation fins to protect the gas-smoke switching valve and the diaphragm pump from being damaged by high temperature.

[0029] The present invention provides a method for using a reducing atmosphere pipe seat anti-blocking and sealing system. This method realizes effective cleaning of dust and coke blocks on the pipe seat and automatic adjustment of the sealing system by accurately controlling the start and stop and switching time of each component. This method not only improves the cleaning efficiency and reduces operational failures caused by dust accumulation and blockage, but also ensures the fluency and accuracy of the flue gas during the detection process by automatically switching the gas and smoke path. At the same time, the ingenious design of the flue gas reflux and the sealed middle chamber, combined with the role of the front-stage air sealing ring, effectively isolates the outside air, maintains the reducing atmosphere in the pipe seat area, and ensures the stability and safety of the equipment operation. The overall operation process is simple and easy, with a high degree of automation, which significantly improves the maintenance efficiency and operational reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A connection schematic diagram of a reducing atmosphere pipe base sealing system provided by the present invention;

[0031] Figure 2 A schematic structural diagram of a reducing atmosphere pipe seat anti-blocking device provided by the present invention;

[0032] In the attached figure: 11, pipe seat; 12, bypass; 13, cooling fins; 14, flue gas return pipe; 15, sealed middle chamber; 16, front-stage air sealing ring; 17, rear-stage air sealing ring; 18, center hole at the tail of the pipe seat; 19, exhaust pipe; 21, cleaning rod; 22, connecting rod; 23, driving cylinder; 31, controller; 32, compressed air main valve; 33, cylinder control valve; 34, analytical instrument; 35, diaphragm pump; 36, check valve; 37, gas-smoke switching valve; 38, manual regulating valve; 41, compressed air main pipe; 42, gas duct; 43, flue gas duct; 44, diaphragm pump connecting wire; 45, gas-smoke switching valve connecting wire. DETAILED DESCRIPTION

[0033] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0039] See also Figure 1 and Figure 2 The present invention discloses a reducing atmosphere pipe seat anti-blocking and sealing system, including a pipe seat 11, the material of the pipe seat 11 is 310S, one end of the pipe seat 11 is fixedly connected to a detection hole opened on the outer surface of the boiler water-cooled wall, and is welded and fixed at an angle of 45 degrees, a heat dissipation component is arranged above the middle section of the outer wall of the pipe seat 11, the heat dissipation component includes a bypass 12, one end port of the bypass 12 is connected to the pipe seat 11, the bypass 12 is arranged parallel to the water-cooled wall, and the flue gas in the pipe seat 11 is extracted through the bypass 12; a heat dissipation fin 13 is arranged on the bypass 12, the material of the heat dissipation fin 13 is aluminum alloy, and the high-temperature flue gas flowing through the bypass 12 is cooled by the heat dissipation fin 13, so as to protect the gas-smoke switching valve 37 and the diaphragm pump 35 from being damaged by the high-temperature flue gas.

[0040] The other end port of the bypass 12 is connected to the gas circuit switching component, which includes a gas-smoke switching valve 37, one interface of the gas-smoke switching valve 37 is connected, one interface of the gas-smoke switching valve 37 is connected to the air inlet of the diaphragm pump 35, and the air outlet of the diaphragm pump 35 is connected to the smoke detection component through a pipeline. The smoke detection component includes an analyzer 34, and the analyzer 34 is used to detect the composition of the smoke. The diaphragm pump 35 is connected to the controller 31 through the diaphragm pump connecting wire 44, and the start and stop of the diaphragm pump 35 are controlled by the controller 31; the gas-smoke switching valve 37 is a three-way solenoid valve, and the state of smoke or compressed air circulation is switched by the command issued by the controller 31.

[0041] The other interface of the gas-smoke switching valve 37 is connected to a compressed air main valve 32 through a smoke duct 43 and a compressed air main pipe 41. The compressed air main valve 32 is a two-way solenoid valve. The compressed air main valve 32 is connected to the controller 31 through a wire. The control signal of the controller 31 to the compressed air main valve 32 is transmitted through the wire. The signal of the controller 31 is connected to the gas-smoke switching valve 37.

[0042] The gas and smoke switching valve 37 is connected to the controller 31 through the gas and smoke switching valve connecting wire 45; the controller 31 is connected to the cylinder control valve 33 through a wire. The cylinder control valve 33 is a three-way valve. The cylinder control valve 33 is installed on the driving cylinder 23, and the two valve ports of the cylinder control valve 33 are connected to the inlet and outlet of the driving cylinder 23 and the outlet to form an air supply circuit for the driving cylinder 23. The remaining valve port of the cylinder control valve 33 is connected to the interface of the gas and smoke switching valve 37 on the compressed air main valve 32 through the gas conduit 42 to transmit the compressed air to the cylinder control valve 33. The telescopic head end of the driving cylinder 23 is connected to the connecting The connecting rod 22 and the driving cylinder 23 are piston cylinders. A tube seat tail center hole 18 is provided on the outer end face of the tube seat 11. One end of the connecting rod 22 extends from the tube seat tail center hole 18 provided on the tube seat 11 to the inside of the tube seat 11, and a cleaning rod 21 is provided on the end head. The cleaning rod 21 is concentrically arranged with the tube seat 11. The material of the cleaning rod 21 is 310S. The end of the cleaning rod 21 close to the water-cooled wall is set to a sharp shape. Driven by the driving cylinder 23, the sharp part of the cleaning rod 21 pierces the coke on the inner wall of the water-cooled wall to prevent blockage at the connection between the pipeline 11 and the furnace.

[0043] A flue gas return pipe 14 is arranged above the middle and rear section of the outer side of the pipe seat 11. The flue gas return pipe 14 is arranged along the radial direction of the pipe seat 11, and one end port of the flue gas return pipe 14 is connected to the inside of the pipe seat 11. The other end port of the flue gas return pipe 14 is connected to one end interface of a check valve 36 through a pipeline. The other end interface of the check valve 36 is connected to an analysis instrument 34 through a pipeline. The end port of the check valve 36 connected to the flue gas return pipe 14 is connected to a manual regulating valve 38 through a pipeline. When the flue gas flows through the check valve 36, a part of the flue gas will be discharged from the manual regulating valve 38. In order to ensure When enough flue gas enters the flue gas return pipe 14, the manual regulating valve 38 must be adjusted to a sufficiently small flow rate to ensure the flue gas flow entering the flue gas return pipe 14. After the flue gas flows out from the check valve 36, most of the flue gas is forced to flow into the flue gas return pipe 14 under the action of the manual regulating valve 38. The check valve 36 can only flow in one direction, so that the flue gas can only flow from the diaphragm pump 35 to the direction of the flue gas return pipe 14 and the manual regulating valve 38. That is, when the compressed air purges the inside of the pipe seat 11, it effectively prevents part of the high-pressure compressed air from overflowing from the flue gas return pipe 14 and causing damage to the analytical instrument 34.

[0044] An exhaust pipe 19 is disposed above the outermost end of the tube seat 11, and one end of the exhaust pipe 19 is connected to the tube seat 11;

[0045] Air sealing components are arranged on both sides of the port of the smoke return pipe 14 in the pipe seat 11, and the air sealing components include a rear-stage air sealing ring 17 and a front-stage air sealing ring 16, and two rear-stage air sealing rings 17 and front-stage air sealing rings 16 are arranged, and the two front-stage air sealing rings 16 are arranged in the pipe seat 11 on the same side of the port of the smoke return pipe 14, and a sealed middle chamber 15 is formed at the position of the port of the smoke return pipe 14 in the pipe seat 11 through the rear-stage air sealing ring 17 and the front-stage air sealing ring 16. When the smoke enters the sealed middle chamber 15, it flows to the direction of the front-stage air sealing ring 16 and the rear-stage air sealing ring 17 respectively. Since the smoke occupies the internal space of the sealed middle chamber 15, the front-stage air sealing ring 16 flows to the front-stage air sealing ring 16. The resistance to the flow of the sealing ring 16 is greater than the resistance to the flow to the rear-stage air sealing ring 17, so that the flue gas flows out from the rear-stage air sealing ring 17 to the exhaust pipe 19 and then is discharged, thereby preventing the entry of air in the flue gas in the bypass 12 and improving the accuracy of the flue gas detection data; the front-stage air sealing ring 16 is installed on the side of the water-cooled wall close to the tube seat 11, and the rear-stage air sealing ring 17 is installed on the side close to the outer end of the tube seat 11. The rear-stage air sealing ring 17 and the front-stage air sealing ring 16 are both provided with arc-shaped ventilation channels, and an annular Tesla valve structure is formed between the arc-shaped ventilation channel and the outer wall of the cleaning rod 21. The flue gas flow to the outer end of the tube seat 11 is blocked and undergoes two stages A and B (such as Figure 2 As shown in FIG. 1 , the resistance gradually increases to generate negative pressure inside the pipe seat 11, so that only a small amount of flue gas from the outlet of the diaphragm pump 35 can be received to join the flue gas newly extracted from the furnace, and then cooperate with the rear-stage air sealing ring 17 to achieve a sealing effect.

[0046] The present invention also discloses a method for using a reducing atmosphere pipe seat anti-blocking and sealing system, which is used to control the above system and includes the following operating steps:

[0047] Step 1, sequentially set the start and stop time of the compressed air main valve 32, the cylinder control valve 33, the diaphragm pump 35 and the gas and smoke switching valve 37 in the controller 31, the start and stop time includes the opening time and the closing time, that is, the first opening time and the first closing time, the second opening time and the second closing time, the third opening time and the third closing time, the fourth opening time and the fourth closing time; set the switching time of the gas and smoke switching valve 37 in the controller 31;

[0048] Step 2: The controller 31 opens the compressed air main valve 32 based on the set first opening time, and opens the cylinder control valve 33 based on the set second opening time. The cylinder control valve 33 controls the driving cylinder 23 to start, driving the cleaning rod 21 to puncture and crush the coked ash and coke blocks at the connection between the tube seat 11 and the water-cooled wall; the gas and smoke switching valve 37 is opened based on the set fourth opening time, and the compressed air flows from the bypass 12 into the connection between the tube seat 11 and the water-cooled wall to blow out the crushed ash and coke blocks;

[0049] Step 3, the controller 31 closes the cylinder control valve 33 based on the set second closing time to restore the driving cylinder 23 to the initial state, the controller 31 closes the compressed air main valve 32 based on the set first closing time, and the controller 31 closes the gas and smoke switching valve 37 based on the set fourth closing time;

[0050] Step 4, the controller 31 switches the gas and smoke switching valve 37 based on the set switching time, closes the gas passage between the compressed air main valve 32 and the bypass 12, and switches to the gas passage between the bypass 12 and the diaphragm pump 35. The controller 31 starts the diaphragm pump 35 based on the third opening time. The diaphragm pump 35 draws smoke and flows through the pipe seat 11, the bypass 12, and the gas and smoke switching valve 37 in sequence. After passing through the diaphragm pump 35, it is divided into two paths and flows to the analysis instrument 34 and the check valve 36 respectively. The smoke flowing through the check valve 36 flows to the manual regulating valve 38 and the smoke return pipe 14, and the smoke flows through the check valve 36 to reach the preset opening to generate resistance. The smoke flows through the smoke return pipe 14 and then enters the sealed middle chamber 15. Based on the action of the front-stage air sealing ring 16, the smoke is discharged from the exhaust pipe 19.

[0051] Step 5: After the analysis instrument 34 completes the detection, the controller 31 turns off the diaphragm pump 35 based on the set third closing time, and the controller 31 turns off the gas and smoke switching valve 37 based on the set fourth closing time.

[0052] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0053] In addition, it should be understood that although this specification is described in accordance with the implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A reducing atmosphere pipe socket anti-blocking and sealing system, It is characterized in that It comprises a tube seat (11), one end of which is fixedly connected to a detection hole opened on the outer surface of a boiler water-cooled wall, and the other end of which is connected to a dust cleaning component; The dust cleaning component comprises a driving cylinder (23), the telescopic head end of the driving cylinder (23) is connected to the end of the pipe seat (11), the telescopic head of the driving cylinder (23) is connected to a dust cleaning rod (22), the dust cleaning rod (22) extends to a port in the pipe seat (11) connected to the detection hole, and the driving cylinder (23) is signal-connected to a controller (31); A flue gas return pipe (14) is arranged on the pipe seat (11), and the other end port of the flue gas return pipe (14) is connected to the pipe seat (11); a front-stage air sealing ring (16) is installed on one side of the port of the flue gas return pipe (14) in the pipe seat (11), and a rear-stage air sealing ring (17) is installed on the other side of the port of the flue gas return pipe (14) in the pipe seat (11); an arc-shaped ventilation channel is arranged in the front-stage air sealing ring (16) and the rear-stage air sealing ring (17); the space between the arc-shaped ventilation channel and the inner wall of the pipe seat (11) and the outer wall of the cleaning rod (22) forms a Sla valve sealing structure; an exhaust pipe (19) for discharging flue gas is arranged on the end of the pipe seat (11) close to the cleaning component.

2. A reducing atmosphere pipe socket anti-blocking and sealing system according to claim 1, It is characterized in that The controller (31) is signal-connected to a gas circuit switching component, the gas circuit switching component is connected to a smoke detection component, and the smoke detection component is in communication with one end of the smoke return pipe (14); The gas path switching component comprises a gas and smoke switching valve (37), the gas and smoke switching valve (37) is connected to a compressed air main valve (32) and a heat dissipation component, and the heat dissipation component is in communication with the pipe seat (11); The gas and smoke switching valve (37) is connected to the smoke detection component, and the gas and smoke switching valve (37) and the compressed air main valve (32) are connected to the controller (31) via signals.

3. A reducing atmosphere pipe seat anti-blocking and sealing system according to claim 2, It is characterized in that The gas and smoke switching valve (37) is a three-way solenoid valve.

4. A reducing atmosphere pipe seat anti-blocking and sealing system according to claim 2, It is characterized in that The compressed air main valve (32) is connected to the gas and smoke switching valve (37), which is connected to a cylinder control valve (33). The cylinder control valve (33) is connected to the driving cylinder (23) to provide an operating air source for the driving cylinder (23).

5. A reducing atmosphere pipe seat anti-blocking and sealing system according to claim 4, It is characterized in that The compressed air main valve (32) is a two-way solenoid valve.

6. A reducing atmosphere pipe socket anti-blocking and sealing system according to claim 4, It is characterized in that The cylinder control valve (33) is a three-way solenoid valve.

7. A reducing atmosphere pipe socket anti-blocking and sealing system according to claim 2, It is characterized in that The heat dissipation component comprises a bypass (12), wherein the bypass (12) is arranged on the tube seat (11), one end interface of the bypass (12) is connected to the tube seat (11), and the other end interface of the bypass (12) is connected to the gas and smoke switching valve (37), and heat dissipation fins (13) are arranged on the outer wall of the bypass (12).

8. A reducing atmosphere pipe socket anti-blocking and sealing system according to claim 2, It is characterized in that The smoke detection component comprises a diaphragm pump (35), the air inlet of the diaphragm pump (35) is connected to the gas-smoke switching valve (37), the air outlet of the diaphragm pump (35) is connected to an analysis instrument (34) and a check valve (36), and the check valve (36) is connected to the smoke return pipe (14).

9. A reducing atmosphere pipe socket anti-blocking and sealing system according to claim 2, It is characterized in that A manual regulating valve (38) is connected to the side of the check valve (36) that is in communication with the smoke return pipe (14).

10. A method for using a reducing atmosphere pipe seat anti-blocking and sealing system, used to control the system according to any one of claims 1 to 9, It is characterized in that The following steps are involved: Step 1, sequentially setting the start and stop times of the compressed air main valve (32), the cylinder control valve (33), the diaphragm pump (35) and the gas and smoke switching valve (37) in the controller (31), and setting the switching time of the gas and smoke switching valve (37) in the controller (31); Step 2, the controller (31) opens the compressed air main valve (32) and the cylinder control valve (33) based on the set start and stop time, and the cylinder control valve (33) controls the drive cylinder (23) to start, driving the ash cleaning rod (21) to puncture and crush the coked ash and coke blocks at the connection port between the tube seat (11) and the water-cooled wall; based on the set start and stop time, the gas and smoke switching valve (37) is opened, and compressed air flows from the bypass (12) into the connection port between the tube seat (11) and the water-cooled wall to blow out the crushed ash and coke blocks; Step 3, the controller (31) closes the cylinder control valve (33) based on the set start and stop time, so that the driving cylinder (23) returns to an initial state, the controller (31) closes the compressed air main valve (32) based on the set start and stop time, and the controller (31) closes the gas and smoke switching valve (37) based on the set start and stop time; Step 4, the controller (31) switches the gas-smoke switching valve (37) based on the set switching time, closes the gas passage between the compressed air main valve (32) and the bypass (12), and switches to the gas passage between the bypass (12) and the diaphragm pump (35). The controller (31) starts the diaphragm pump (35) based on the set start-stop time. The diaphragm pump (35) extracts the smoke to flow through the pipe seat (11), the bypass (12), the gas-smoke switching valve (37) in sequence. The smoke flows through the diaphragm pump (35) and is divided into two paths, respectively, to the analysis instrument (34) and the check valve (36). The smoke flows through the check valve (36) and flows to the manual regulating valve (38) and the smoke return pipe (14). The smoke flows through the check valve (36) to a preset opening to generate resistance. The smoke flows through the smoke return pipe (14) and then enters the sealed middle chamber (15). Based on the action of the front-stage air sealing ring (16), the smoke is discharged from the exhaust pipe (19); Step 5: After the analysis instrument (34) completes the detection, the controller (31) turns off the diaphragm pump (35) and the gas and smoke switching valve (37) based on the set start and stop time.

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