Anti-clogging purge system for acoustic temperature measuring instruments in coal-fired boilers and method of use
The clogging purge system for coal-fired boilers uses a surge tank and controlled purge branches to prevent ash entry, maintaining static pressure and ensuring efficient, timely purging, addressing clogging and stability issues in acoustic temperature measurement devices.
Patent Information
- Application Number
- JP2023529133
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- Priority Date
- 2022-06-09
- Filing Date
- 2023-05-08
- Publication Date
- 2025-02-05
- Estimated Expiration
- 2043-05-08
AI Technical Summary
The clogging of acoustic temperature measurement devices in coal-fired boilers due to ash accumulation leads to damage and instability, and existing purge systems are inefficient, causing energy waste and potential water damage.
A clogging purge system with a surge tank, automatic drainage valve, and controlled purge branches, including micro-pressure and regular-pressure branches, maintains static pressure and prevents ash entry using a rigid air curtain and controlled purge mechanisms.
The system effectively prevents ash clogging, maintains device stability, reduces energy waste, and ensures efficient and timely purging, ensuring smooth operation and measurement integrity.
Smart Images
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Abstract
Description
[Technical field]
[0001] The present invention relates to the technical field of acoustic temperature measurement, and more particularly to an anti-clogging purge system and method of use for acoustic temperature measurement instruments in coal-fired boilers. [Background technology]
[0002] At present, coal-fired boilers still mostly use contact temperature measurement methods such as high-temperature probe thermocouples to measure the high-temperature smoke temperature in the hearth. With the development of acoustic temperature measurement technology, some coal-fired boilers now use acoustic temperature measurement instruments to measure the high-temperature smoke temperature in the hearth.
[0003] Because the fuel for a coal-fired boiler is fuel coal, and the ash content of the smoke in the furnace is high, if the ash enters the measuring parts of the acoustic temperature measuring instrument, it may cause damage to the measuring parts. Long-term ash accumulation in the measuring hole is also likely to cause the acoustic temperature measuring hole to be clogged. When the flame in the boiler is tilted, coking clogging or local high temperature damage to the parts may occur. In order to ensure that the acoustic temperature measuring instrument works stably for a long period of time, an anti-clogging purge system must be arranged at the same time.
[0004] When the instrument compressed air is constantly flowing through each acoustic temperature measuring component to purge and prevent clogging, if the flow rate is not set reasonably, it will cause a large amount of energy waste or affect the anti-clogging effect. If the upstream instrument air compressor of the power plant has a drainage failure, the water in the instrument air belt may damage the acoustic temperature measuring component. If the upstream air source pressure is not stable, the anti-clogging purge effect may be affected. Summary of the Invention [Problem to be solved by the invention]
[0005] SUMMARY OF THE DISCLOSURE In order to solve the technical problems in the prior art, the present invention aims to provide an anti-clogging purge system and method for use of an acoustic temperature measuring instrument in a coal-fired boiler. [Means for solving the problem]
[0006] In order to achieve the above object and achieve the above technical effects, the present invention employs the following technical means.
[0007] Anti-clogging purge system for acoustic temperature measuring instruments in coal-fired boilers an automatic draining surge tank including a surge tank and an automatic draining valve communicating with the surge tank, the surge tank being filled with compressed air to hold pressure for downstream purge air; a purge main line, the upstream of which is connected to a surge tank and the downstream of which is connected to each acoustic temperature measuring component, a main line manual valve being provided between the surge tank and the purge main line, a micro-pressure purge branch line and a regular purge branch line being provided between the purge main line and each acoustic temperature measuring component, the purge pressure and air volume of the regular purge branch line being higher than those of the micro-pressure purge branch line, during normal operation, the main line manual valve is open, and the compressed air in the surge tank passes through the purge main line to reach each acoustic temperature measuring component, and is connected to each micro-pressure purge branch line and the regular purge branch line respectively on the way to realize purging, and the static pressure in the sound guide of the acoustic temperature measuring component is kept at a slightly positive pressure by controlling the air volume of the micro-pressure purge branch line.
[0008] Furthermore, the surge tank's intake port is provided in the middle and lower part of the tank body, and its vent is provided in the upper part of the tank body. The instrument compressed air provided by the power plant is connected to the surge tank via a metal pipeline. If the instrument compressed air contains water, the water will remain in the middle and lower part of the surge tank and will be discharged from the surge tank by the automatic drain valve, and will not enter the downstream purge pipeline.
[0009] Furthermore, a pressure regulating valve adjusting branch and a manual valve adjusting branch are attached to the low pressure purge branch, and the downstream of the pressure regulating valve adjusting branch and the downstream of the manual valve adjusting branch are both connected to the sound wave guide of the acoustic temperature measuring component.
[0010] Furthermore, a micro-pressure purge branch pressure regulating valve is attached to the pressure regulating valve adjustment branch, and by adjusting the micro-pressure purge branch pressure regulating valve and observing the pressure gauge values, the air volume of the pressure regulating valve adjustment branch is set to a small flow rate, the static pressure in the sonic guide is maintained at a slightly positive pressure, and the ash in the smoke is prevented from entering the sonic guide when there is a localized slightly positive pressure in the hearth.
[0011] In addition, the manual valve adjustment branch is equipped with a micro-pressure purge branch manual valve for on-site manual purging, and when obvious clogging occurs, the amount of purge air is increased to timely blow away the ash accumulated in the sonic guide.
[0012] In addition, the periodic purge branch line is provided with a periodic purge branch line manual valve and a periodic purge branch line solenoid valve in this order, the downstream of the periodic purge branch line solenoid valve is connected to the sonic conduit of the acoustic temperature measuring component, the compressed air in the periodic purge branch line passes through the periodic purge branch line manual valve and the periodic purge branch line solenoid valve in this order before entering the sonic conduit, and the exhaust volume of the periodic purge branch line is manually adjusted by the periodic purge branch line manual valve.
[0013] Furthermore, the periodic purge branch solenoid valve is connected to a purge controller by a periodic purge branch solenoid valve circuit.
[0014] Additionally, a pressure sensor is attached to the sonic conduit and connected to a purge controller by a pressure sensor circuit within the sonic conduit.
[0015] Further, the sonic guide includes a component connection flange, a sonic guide cavity, a slight breeze positive pressure blocking air duct internal cavity, a swirling purge air duct and a pipe seat connection flange, and a component connection flange is provided at one end of the sonic guide cavity, and the component connection flange connects and fixes the acoustic temperature measurement component, and a pipe seat connection flange is provided at the opposite other end of the sonic guide cavity, and the entire sonic guide cavity has a 90° arc-shaped elbow structure, and a slight breeze positive pressure blocking air duct internal cavity, a plurality of swirling purge air ducts and a plurality of slight breeze positive pressure blocking air duct inlets are provided at the other end of the sonic guide cavity, and the inside of the sonic guide cavity is connected to the swirling purge air duct, and the slight breeze positive pressure blocking air duct inlet is connected to the slight breeze positive pressure blocking air duct. The air duct is connected to the internal cavity, and a small breeze volume positive pressure blocking air duct air outlet is formed in the small breeze volume positive pressure blocking air duct internal cavity, and the small breeze volume positive pressure blocking air duct air outlet is connected to the sonic guide internal cavity provided inside the sonic guide cavity, and the compressed air enters the sonic guide cavity from the swirling purge air duct along the circumferential tangential direction, and the purge wind passes through the swirling purge air duct to form a swirling purge wind, and a small amount of compressed air passes through the small breeze volume positive pressure blocking air duct inlet and enters the small breeze volume positive pressure blocking air duct internal cavity, and then passes through the small breeze volume positive pressure blocking air duct air outlet and enters the sonic guide internal cavity, forming a rigid air curtain at the head part inside the sonic guide, and maintaining the small positive pressure at the sonic guide head part.
[0016] How to use anti-clogging purge system for acoustic temperature measurement instrument in coal-fired boiler During normal operation, opening the main line manual valve, the periodic purge branch solenoid valve, the periodic purge branch manual valve, the micro pressure purge branch manual valve, and the micro pressure purge branch pressure regulating valve so that the compressed air in the surge tank passes through the purge main line and reaches each acoustic temperature measuring component; When purging is required, the purge controller sets a purge program, and manually adjusts the exhaust volume of the periodic purge branch through the manual valve of the periodic purge branch. After the adjustment is completed, there is no need to adjust it during daily operation. Based on the measurement sequence of the acoustic temperature measurement parts, within the measurement interval time, the purge controller controls the on / off of the solenoid valve of the periodic purge branch according to the purge program to realize the purging of the sonic guide connected to the periodic purge branch. Based on the adjustment of the pressure regulating valve of the micro pressure purge branch and the observation of the value of the pressure gauge, the air volume of the pressure regulating valve adjustment branch is set to a small flow rate, the static pressure in the sonic guide is kept at a slight positive pressure, and the local pressure in the hearth is reduced. the step of: preventing ash in the smoke from entering the sonic guide when slight positive pressure is applied; manually purging on-site through the manual valve of the slight pressure purge branch; increasing the amount of purge air to blow away the ash accumulated in the sonic guide in a timely manner when obvious clogging occurs; and the purge controller receiving the parameters detected by the pressure sensor in the sonic guide, judging whether the inside of the measurement hole is smooth according to the pressure drop speed after purging, and increasing the next regular purge time of the acoustic temperature measurement component when the pressure drop speed in the pressure transmission tube of a certain acoustic temperature measurement component becomes slow. Effect of the Invention
[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention discloses an anti-clogging purge system and method for use in acoustic temperature measurement instruments in coal-fired boilers. The system includes an automatic draining surge tank including a surge tank and an automatic draining valve communicating therewith, the surge tank being filled with compressed air to hold the downstream purge air under pressure; a purge main line, the upstream of which is connected to the surge tank and the downstream of which is connected to each acoustic temperature measuring component, a main line manual valve being provided between the surge tank and the purge main line, a micro-pressure purge branch line and a regular purge branch line being provided between the purge main line and each acoustic temperature measuring component, the purge pressure and air volume of the regular purge branch line being both higher than those of the micro-pressure purge branch line, during normal operation, the main line manual valve is open, and the compressed air in the surge tank passes through the purge main line to reach each acoustic temperature measuring component, and is connected to each micro-pressure purge branch line and regular purge branch line on the way, and the static pressure in the sonic guide of the acoustic temperature measuring component is kept at a slightly positive pressure by controlling the air volume of the micro-pressure purge branch line. The anti-clogging purging system and method of the present invention for an acoustic temperature measuring instrument for a coal-fired boiler realizes purging by a micro-pressure purge branch and a regular purge branch. A pressure regulating valve adjusting branch and a manual valve adjusting branch are installed in the micro-pressure purge branch. A micro-pressure purge branch pressure regulating valve is installed in the pressure regulating valve adjusting branch. A micro-pressure purge branch manual valve is installed in the manual valve adjusting branch. The regular purge branch is provided with a regular purge branch manual valve and a regular purge branch solenoid valve. By controlling the on / off of the manual valve and the solenoid valve, regular fixed quantity purging is realized, and the ash accumulated in the acoustic guide can be blown off in a timely manner. Then, the pressure drop speed after purging can be judged as to whether the inside of the measuring hole is smooth or not, and the regular purging time of the acoustic temperature measuring component can be adjusted in a timely manner to ensure that the measuring hole is smooth. The intelligent level is high, the purging efficiency is high, and a satisfactory anti-clogging purging effect can be achieved. [Brief description of the drawings]
[0018] [Figure 1] FIG. 1 is a schematic diagram of the present invention. [Diagram 2] FIG. 2 is a schematic diagram of the purge branch arrangement of the present invention. [Diagram 3] FIG. 2 is a schematic perspective view showing the structure of the acoustic wave guide of the present invention. [Figure 4] FIG. 2 is a cross-sectional view of the internal structure of the acoustic wave guide of the present invention. [Diagram 5] 4 of the present invention, FIG. a is a cross-sectional view taken along line AA in FIG. 4 of the present invention, FIG. b is a cross-sectional view taken along line BB in FIG. 4 of the present invention, and FIG. c is a cross-sectional view taken along line CC in FIG. 4 of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0019] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail, so as to enable those skilled in the art to more easily understand the advantages and features of the present invention, and to more clearly limit the protection scope of the present invention.
[0020] SUMMARY OF THE DISCLOSURE The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, nor is it intended to identify key or critical elements of all aspects, nor to delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.
[0021] In addition, in the description of the present invention, the orientations or positional relationships indicated by terms such as "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inside", and "outside" are based on the orientations or positional relationships shown in the drawings, and are merely intended to facilitate or simplify the description of the present invention, and do not indicate or imply that the devices or parts shown must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be understood as limiting the present invention.
[0022] As shown in Figs. 1-5, the anti-clogging purge system of the acoustic temperature measuring instrument of the coal-fired boiler includes an automatic drain surge tank and a purge main line 4; The automatic draining surge tank includes a surge tank 1 and an automatic draining valve 2. The instrument compressed air provided by the power plant is connected to the surge tank 1 through a metal pipeline. The surge tank 1 maintains a certain high pressure after the compressed air is filled inside, and keeps the downstream purge air under pressure. The surge tank 1 has an air inlet in the middle and lower part of the tank body, and an air vent in the upper part of the tank body. When the instrument compressed air contains water, the water remains in the middle and lower part of the surge tank 1. When it reaches a certain amount, it is discharged from the surge tank 1 by the automatic draining valve 2 and does not enter the downstream purge pipeline. The main purge line 4 is a compressed air transport line made by welding metal lines. It is connected to the surge tank 1 at its upstream and to each acoustic temperature measuring component at its downstream. It is converted by a T-shaped pipe at its end into two branches, namely, the micro-pressure purge branch line 5 and the regular purge branch line 6. A main line manual valve 3 is provided between the surge tank 1 and the main purge line 4. The main line manual valve 3 is manually closed after the unit is stopped and cooled down to close the air supply line and reduce unnecessary air consumption. During normal operation, the main line manual valve 3 is open, and the compressed air in the surge tank 1 passes through the main purge line 4 to reach each acoustic temperature measuring component, and is connected by a T-shaped pipe to each micro-pressure purge branch line 5 and regular purge branch line 6 on the way.
[0023] In a specific embodiment, the micro-pressure purge branch 5 is equipped with a pressure regulating valve adjustment branch and a manual valve adjustment branch, and the downstream of both is connected to the sonic guide 7 (sound temperature measurement sound transmission device) of the acoustic temperature measurement component. The pressure regulating valve adjustment branch is equipped with a micro-pressure purge branch pressure regulating valve 14, and the air volume of the pressure regulating valve adjustment branch is set to a small flow rate by adjusting the micro-pressure purge branch pressure regulating valve 14 and observing the value of the pressure gauge, with the purpose of maintaining the static pressure in the sonic guide 7 at a small positive pressure by small air consumption, and preventing the ash in the smoke from entering the sonic guide 7 when the localized micro-positive pressure in the hearth is present. The manual valve adjustment branch is equipped with a micro-pressure purge branch manual valve 13 for manual purging on site, and when obvious clogging occurs, the purge air volume is increased to blow off the ash accumulated in the sonic guide 7 in a timely manner.
[0024] The periodic purge branch 6 is provided with a periodic purge branch manual valve 12 and a periodic purge branch solenoid valve 11, the downstream of the periodic purge branch solenoid valve 11 is connected to the sonic conduit 7 of the acoustic temperature measuring component, and the compressed air in the periodic purge branch 6 passes through the periodic purge branch manual valve 12 and the periodic purge branch solenoid valve 11 in order before entering the sonic conduit 7. The periodic purge branch manual valve 12 is adjusted to an appropriate opening according to the pressure parameters of the compressed air to meet the pressure requirements of a single purge, and the periodic purge branch solenoid valve 11 controls the start and end of a single purge. The periodic purge branch manual valve 12 is for manually adjusting the exhaust volume of the periodic purge branch 6, and does not need to be adjusted during daily operation after the adjustment is completed. The periodic purge branch solenoid valve 11 is connected to the purge controller 10 by the periodic purge branch solenoid valve circuit 8. The purge pressure and air volume of the periodic purge branch 6 are both higher than those of the low pressure purge branch 5, and the purpose of the periodic purge is to prevent the inside of the measurement hole from being blocked by accumulated ash or coke.
[0025] A pressure sensor is attached to the sonic conduit 7 and is capable of measuring a static pressure parameter inside the sonic conduit 7 and is connected to a purge controller 10 by a pressure sensor circuit 9 within the sonic conduit.
[0026] The purge controller 10 is a PLC with a program written in it, and has a built-in purge program. The purge controller 10 is responsible for setting the periodic purge, and realizes the periodic purge by controlling the on / off of the periodic purge branch solenoid valve 11 by the built-in purge program. Based on the measurement sequence of the acoustic temperature measuring parts, the periodic purge branch 6 is controlled to purge the sonic guides 7 one by one within the measurement interval time. Based on the measurement sequence of the acoustic temperature measuring parts, the periodic purge branch is controlled to purge the sonic guides one by one within the measurement interval time. Then, the purge controller 10 accesses the parameters of the pressure sensor in the sonic guide 7, and judges whether the inside of the measurement hole is smooth based on the pressure drop rate after purging. If the pressure drop rate in the pressure transmission tube of a certain temperature measuring part slows down (i.e., local clogging begins to occur), the next periodic purge time of the temperature measuring part is increased to keep the measurement hole smooth.
[0027] In a specific embodiment, the sonic guide 7 includes a component connection flange 71, a sonic guide cavity 72, a swirling purge air duct 74 and a pipe seat connection flange 75, etc., the component connection flange 71 is provided at one end of the sonic guide cavity 72, which connects and fixes the acoustic temperature measurement component (sound-producing component or sound-collecting component), and the pipe seat connection flange 75 is provided at the opposite other end of the sonic guide cavity 72, which connects and fixes the entire sonic guide to the temperature measurement pipe seat of the water-cooled wall, the entire sonic guide cavity 72 has a 90° arc-shaped elbow structure, and the primary acoustic temperature measurement component is installed vertically downward, and the ash in the sonic guide cavity 72 is not likely to enter the inside of the primary acoustic temperature measurement component under the influence of its own weight.
[0028] In a specific embodiment, a plurality of swirl purge air ducts 74 are spaced apart on the horizontal portion of the end of the arc elbow of the sonic guide cavity 72, preferably four swirl purge air ducts 74 are uniformly arranged along the tangential direction of the circumference, for a total of four air inlets, one end of the swirl purge air ducts 74 is inserted into the sonic guide cavity 72 in an oblique manner, and the other end of the swirl purge air ducts 74 extends out from the sonic guide cavity 72. The swirling purge air duct 74 is connected to the swirling purge air duct, and the compressed air enters the inside of the sonic guide cavity 72 along the tangential direction of the circumferential direction from the swirling purge air duct 74. The purge wind passes through the swirling purge air duct 74 to form a swirling purge wind, which has a larger purge disturbance than the general straight purge wind. The purge wind swirls forward along the inner wall of the sonic guide cavity 72, and can better carry out the ash on the inner wall surface of the sonic guide cavity 72.
[0029] A steel pipe 710 is concentrically fitted onto the outside of the end of the horizontal part at the right end adjacent to the pipe seat connection flange 75 of the sonic guide cavity 72, and the annular space between the steel pipe 710 and the sonic guide cavity 72 is the low-volume positive pressure blocking air duct internal cavity 77, which is divided into a number of individual regions by a number of reinforcing ribs 709 arranged parallel to the sonic guide cavity 72, and the reinforcing ribs 709 maintain the internal space of the low-volume positive pressure blocking air duct internal cavity 77 and prevent deformation.
[0030] A plurality of slight breeze volume positive pressure blocking air duct inlets 73 are inclined in the sonic guide cavity 72 and the steel pipe 710, a slit slight breeze volume positive pressure blocking air duct air outlet 76 is formed at the end of the slight breeze volume positive pressure blocking air duct internal cavity 77, a sonic guide internal cavity 78 is formed inside the sonic guide cavity 72, one end of the slight breeze volume positive pressure blocking air duct inlet 73 extends from the sonic guide cavity 72 and the steel pipe 710, the other opposite end of the slight breeze volume positive pressure blocking air duct inlet 73 communicates with the slight breeze volume positive pressure blocking air duct internal cavity 77, and then flows through the slight breeze volume positive pressure blocking air duct air outlet 76 into the sonic guide. The compressed air passes through the low-volume positive pressure blocking air duct inlet 73 and enters the low-volume positive pressure blocking air duct internal cavity 77, and then passes through the low-volume positive pressure blocking air duct air outlet 76 and enters the sonic guide internal cavity 78, forming a rigid air curtain inside the sonic guide. The rigid air curtain formed by the injected annular airflow on the end face close to the flange connector of the sonic guide internal cavity 78 is conical, has a high wind speed at the air outlet, and has high overall rigidity, which can maintain the low-volume positive pressure at the sonic guide head and prevent the ash in the smoke in the hearth from entering the inside of the sonic guide.
[0031] The connector end face of the low-volume positive pressure blocking air duct outlet 76 and the pipe seat connection flange 75 forms an included angle of approximately 20° forward, which pushes external smoke outward and prevents ash from entering; the area of the outlet is small, and air consumption is low.
[0032] In a more specific embodiment, two low breeze volume positive pressure blocking air duct inlets 73 are provided, and the two low breeze volume positive pressure blocking air duct inlets 73 are respectively inclined on both sides of the sonic guide cavity 72, and the included angle between the low breeze volume positive pressure blocking air duct inlet 73 and the sonic guide cavity 72 can be flexibly designed according to actual needs.
[0033] The parts or structures of the present invention that are not specifically described may use conventional technology or conventional products, and the description thereof will be omitted here.
[0034] The above is merely an embodiment of the present invention, and does not limit the scope of the claims of the present invention. Any equivalent configuration or equivalent flow modification made by utilizing the contents of the specification and drawings of the present invention, or any direct or indirect application to other related technical fields, is also included in the scope of the claims of the present invention.
Claims
1. an automatic draining surge tank including a surge tank and an automatic draining valve communicating with the surge tank, the surge tank being filled with compressed air to hold downstream purge air under pressure; a purge main line, the upstream of which is connected to a surge tank and the downstream of which is connected to each acoustic temperature measuring component, a main line manual valve is provided between the surge tank and the purge main line, a low pressure purge branch line and a regular purge branch line are provided between the purge main line and each acoustic temperature measuring component, and the purge pressure and air amount of the regular purge branch line are both higher than those of the low pressure purge branch line; During normal operation, the main line manual valve is open, and the compressed air in the surge tank passes through the purge main line to reach each acoustic temperature measuring component, and is connected to each micro-pressure purge branch line and regular purge branch line on the way to realize purging. By controlling the amount of air in the micro-pressure purge branch line, the static pressure in the sound guide of the acoustic temperature measuring component is kept at a slight positive pressure. A clogging prevention purge system for an acoustic temperature measuring device of a coal-fired boiler, comprising:
2. The surge tank's air intake is provided in the middle and lower part of the tank body, and its air vent is provided in the upper part of the tank body. The instrument compressed air provided by the power plant is connected to the surge tank through the purge main line. When the instrument compressed air contains water, the water remains in the middle and lower part of the surge tank and is discharged from the surge tank by the automatic drain valve, and does not enter the purge main line.
2. The anti-clogging purge system for an acoustic temperature measuring device of a coal-fired boiler according to claim 1.
3. A pressure regulating valve adjusting branch and a manual valve adjusting branch are attached to the micro pressure purge branch, and the downstream of the pressure regulating valve adjusting branch and the downstream of the manual valve adjusting branch are both connected to the sound wave guide of the acoustic temperature measuring component.
2. The anti-clogging purge system for an acoustic temperature measuring device of a coal-fired boiler according to claim 1.
4. A micro-pressure purge branch line pressure regulating valve is installed in the pressure regulating valve regulating branch line, and the amount of air in the pressure regulating valve regulating branch line is set to a small flow rate by adjusting the micro-pressure purge branch line pressure regulating valve and observing the value of the pressure gauge, so as to maintain the static pressure in the sonic guide at a slightly positive pressure, and to prevent the ash in the smoke from entering the sonic guide line when the localized slightly positive pressure is present in the hearth.
4. The anti-clogging purge system for an acoustic temperature measuring device for a coal-fired boiler according to claim 3.
5. The manual valve adjustment branch is equipped with a micro-pressure purge branch manual valve for on-site manual purging. When obvious blockage occurs, the amount of purge air is increased to blow off the ash accumulated in the sonic pipe in a timely manner.
4. The anti-clogging purge system for an acoustic temperature measuring device for a coal-fired boiler according to claim 3.
6. The periodic purge branch is provided with a periodic purge branch manual valve and a periodic purge branch solenoid valve in sequence, the downstream of the periodic purge branch solenoid valve is connected to the sonic guide of the acoustic temperature measuring component, the compressed air in the periodic purge branch passes through the periodic purge branch manual valve and the periodic purge branch solenoid valve in sequence before entering the sonic guide, and the exhaust volume of the periodic purge branch is manually adjusted by the periodic purge branch manual valve; 3. The anti-clogging purge system for an acoustic temperature measuring device for a coal-fired boiler according to claim 2.
7. The periodic purge branch solenoid valve is connected to a purge controller by a periodic purge branch solenoid valve circuit.
7. The anti-clogging purge system for an acoustic temperature measuring device for a coal-fired boiler according to claim 6.
8. A pressure sensor is attached to the sonic conduit, and the pressure sensor is connected to a purge controller by a pressure sensor circuit within the sonic conduit.
7. The anti-clogging purge system for an acoustic temperature measuring device for a coal-fired boiler according to claim 1, 3, 4, 5 or 6.
9. The sonic guide includes a component connection flange, a sonic guide cavity, a slight breeze positive pressure blocking air duct internal cavity, a swirling purge air duct and a pipe seat connection flange. The component connection flange is provided at one end of the sonic guide cavity, and the component connection flange connects and fixes the acoustic temperature measurement component. The pipe seat connection flange is provided at the opposite other end of the sonic guide cavity. The entire sonic guide cavity has a 90° arc elbow structure. The other end of the sonic guide cavity is provided with a slight breeze positive pressure blocking air duct internal cavity, a plurality of swirling purge air ducts and a plurality of slight breeze positive pressure blocking air duct inlets. The inside of the sonic guide cavity is connected to the swirling purge air duct, and the slight breeze positive pressure blocking air duct inlet is connected to the slight breeze positive pressure blocking air duct interior. The cavity is connected to the sonic guide internal cavity, and a small breeze volume positive pressure blocking air duct air outlet is formed in the small breeze volume positive pressure blocking air duct internal cavity, and the small breeze volume positive pressure blocking air duct air outlet is connected to the sonic guide internal cavity provided inside the sonic guide cavity, and the compressed air enters the sonic guide cavity along the circumferential tangential direction from the swirling purge air duct, and the purge wind passes through the swirling purge air duct to form a swirling purge wind, and a small amount of compressed air passes through the small breeze volume positive pressure blocking air duct inlet and enters the small breeze volume positive pressure blocking air duct internal cavity, and then passes through the small breeze volume positive pressure blocking air duct air outlet and enters the sonic guide internal cavity, forming a rigid air curtain at the head part inside the sonic guide, and maintaining the small positive pressure at the sonic guide head part.
7. The anti-clogging purge system for an acoustic temperature measuring device for a coal-fired boiler according to claim 1, 3, 4, 5 or 6.
10. During normal operation, opening the main line manual valve, the periodic purge branch solenoid valve, the periodic purge branch manual valve, the micro pressure purge branch manual valve, and the micro pressure purge branch pressure regulating valve so that the compressed air in the surge tank passes through the purge main line and reaches each acoustic temperature measuring component; When purging is required, the purge controller sets a purge program, and manually adjusts the exhaust volume of the regular purge branch through the manual valve of the regular purge branch. After the adjustment is completed, there is no need to adjust it during daily operation. Based on the measurement sequence of the acoustic temperature measurement parts, within the measurement interval time, the purge controller controls the on / off of the solenoid valve of the regular purge branch according to the purge program to realize the purging of the sonic guide connected to the regular purge branch. Based on the adjustment of the pressure regulating valve of the micro pressure purge branch and the observation of the value of the pressure gauge, the air volume of the pressure regulating valve adjustment branch is set to a small flow rate, the static pressure in the sonic guide is kept at a slight positive pressure, and the local pressure in the hearth is reduced. Prevent the ash in the smoke from entering the sonic guide when the slight positive pressure is applied, and manually purge the sonic guide by the manual valve of the slight pressure purge branch line at the site. When obvious clogging occurs, increase the amount of purge air to blow off the ash accumulated in the sonic guide in a timely manner. The purge controller receives the parameters detected by the pressure sensor in the sonic guide, and judges whether the inside of the measurement hole is smooth according to the pressure drop speed after purging. When the pressure drop speed in the pressure transmission tube of a certain sonic temperature measurement component becomes slow, increase the next regular purge time of the sonic temperature measurement component to keep the measurement hole smooth. A method for using the anti-clogging purge system of the acoustic temperature measuring device of a coal-fired boiler according to any one of claims 1 to 7.