Acoustic wave temperature measuring and sampling device of opposed firing boiler

Abstract

The invention relates to the technical field of pulverized coal sampling equipment, in particular to a hedging boiler sound wave temperature measurement sampling device which comprises a hedging boiler body, a flue body is arranged at the top of the hedging boiler body, and a cooling mechanism is arranged on the side wall of the flue body; the cooling cavity shell, the first cooling fins, the partition plate and other components are arranged, the cooling cavity shell is divided into the front cavity and the rear cavity through the partition plate, and the liquid cooling medium can form directional circulation between the front cavity and the rear cavity in combination with the reverse flow design of the one-way valve pipeline. Through the radial distribution structure of the first cooling fins, the heat exchange area of a cooling medium and the high-temperature environment of the flue body is increased, and through cooperation with the annular closed structure of the cooling cavity shell, the device can efficiently take away heat of a temperature measurement area through liquid medium circulation; and therefore, the effect that the high-temperature environment in the flue can be effectively cooled through a double-heat-dissipation structure is achieved.

Description

Technical Field

[0001] This application relates to the technical field of pulverized coal sampling equipment, and in particular to an acoustic wave temperature measurement and sampling device for opposed firing boilers. Background Technique

[0002] With the development of coal-fired boilers towards large-scale and high-efficiency, opposed firing boilers are widely used due to advantages such as high combustion efficiency and low pollutant emissions. During the operation of opposed firing boilers, accurate measurement of the furnace temperature field is crucial for combustion optimization, equipment safety, and pollutant control. Traditional temperature measurement methods (such as contact temperature measurement with thermocouples, thermal resistors, etc.) have problems such as slow response speed, susceptibility to high-temperature corrosion, and limited measuring point coverage, making it difficult to meet the real-time monitoring requirements of the complex temperature field of opposed firing boilers. As a non-contact temperature measurement method, acoustic wave temperature measurement technology can achieve rapid and large-scale measurement of the furnace temperature field by measuring the relationship between the propagation speed of acoustic waves in the medium and temperature. When measuring the acoustic wave temperature of opposed firing boilers, a sampling device is required.

[0003] Currently, the acoustic wave temperature measurement and sampling device for opposed firing boilers generally focuses on the physical sampling function of pulverized coal particles, and realizes the collection of multiple portions of pulverized coal through a conical box and a plugging component. However, it does not integrate a temperature measurement module or a thermal management structure, and cannot meet the real-time monitoring requirements of the temperature field required for acoustic wave temperature measurement of opposed firing boilers. Moreover, the design does not consider the influence of the high-temperature furnace environment (above 1000°C) on the equipment, and there is neither an active cooling structure nor a heat dissipation optimization design. The directly exposed mechanical components are prone to problems such as material aging, seal failure, or transmission jamming under long-term high temperature. Summary of the Invention

[0004] In order to solve the problems mentioned in the above background technique, this application provides an acoustic wave temperature measurement and sampling device for opposed firing boilers.

[0005] An acoustic wave temperature measurement and sampling device for opposed firing boilers provided by this application adopts the following technical solution: An acoustic wave temperature measurement and sampling device for opposed firing boilers includes an opposed firing boiler body, a flue duct body is arranged at the top of the opposed firing boiler body, and a cooling mechanism is arranged on the side wall of the flue duct body; Cooling mechanism, the cooling mechanism includes a positioning ring, a cooling cavity housing, a sealing ring, and a partition board. The positioning ring is fixedly connected to the side wall of the flue duct body, an annular cooling cavity housing is fixedly sleeved on the outside of the positioning ring, a plurality of first heat dissipation fins are evenly distributed in the inner cavity of the cooling cavity housing, a sealing ring is fixedly installed at the axial end of the cooling cavity housing, a partition board is fixedly connected to the end face of the sealing ring, and the partition board divides the inner cavity of the cooling cavity housing into a front chamber and a rear chamber. The front chamber and the rear chamber are respectively communicated with a heat exchange cavity housing through pipes provided with one-way valves, and the flow direction of the one-way valve in the pipe connecting the front chamber is opposite to the flow direction of the one-way valve in the pipe connecting the rear chamber.

[0006] Through the above solution, the positioning ring and the radial first heat sink cooperate to form an annular cooling cavity. In combination with the design of the bidirectional circulation cooling circuit, the heat dissipation efficiency of the side wall of the high-temperature flue is effectively improved.

[0007] Optionally, the cooling mechanism further includes a heat exchange chamber housing, a sealing cover plate, a flange, a heat conduction pipe, a temperature measuring device body, and a second heat sink. The heat exchange chamber housing is fixedly installed on the side wall of the flue body. A sealing cover plate is fixedly connected to the open end of the heat exchange chamber housing. A plurality of heat conduction pipes are arranged in parallel in the inner cavity of the heat exchange chamber housing. Flanges are fixedly installed at the ends of the heat conduction pipes. The temperature measuring device body is fixedly installed in the inner cavity of the heat conduction pipe. A plurality of second heat sinks are evenly distributed on the outer surface of the heat conduction pipe.

[0008] Through the above solution, the combination of the inclined heat conduction pipe with wavy lines and the second heat sink enhances the heat exchange area and the turbulent flow effect, and significantly improves the heat dissipation performance of the temperature measuring device.

[0009] Optionally, the heat exchange chamber housing and the sealing cover plate together form a sealed heat exchange cavity. The heat exchange cavity is respectively communicated with the front chamber and the rear chamber of the cooling chamber housing through two pipes on the side wall of the cooling chamber housing to form a circulating cooling circuit.

[0010] Through the above solution, a double-layer circulation system including a cooling chamber and a heat exchange chamber is constructed. The flow direction of the cooling medium is controlled by a one-way valve to achieve continuous and efficient heat exchange.

[0011] Optionally, the cooling chamber housing is a hollow annular structure, and its annular inner cavity is filled with a liquid cooling medium. The first heat sinks are evenly distributed radially along the cooling chamber housing.

[0012] Through the above solution, the radial radiating fins cooperate with the liquid cooling medium to form a three-dimensional heat dissipation network, effectively reducing the temperature gradient of the flue side wall and ensuring the working environment of the temperature measuring device.

[0013] Optionally, the axial direction of the heat conduction pipe is arranged at an angle of 45-90 degrees with the axial direction of the flue body, and the surfaces of the heat conduction pipe and the second heat sink are provided with wavy heat dissipation lines.

[0014] Through the above solution, the inclined arrangement combined with the wavy heat dissipation lines maximizes the heat exchange surface area in a limited space and reduces the influence of the flue gas flow resistance at the same time.

[0015] Optionally, the flange is provided with mounting holes corresponding to the number of heat conduction pipes. Threaded structures matching the outer diameter of the heat conduction pipes are provided on the inner walls of the mounting holes. The flange is fixedly connected to the end face of the heat exchange chamber housing through bolts.

[0016] Through the above solution, a dual fastening method of threaded connection and bolt fixing is adopted to ensure the installation accuracy and maintenance convenience of the heat pipe array.

[0017] Optionally, the temperature measuring device body includes a temperature sensor and a sound wave generator, the detection end of the temperature sensor extends to the central axis position of the heat conduction tube, and the emission end of the sound wave generator is arranged toward the axial direction of the flue body.

[0018] Through the above solution, the integrated sensing structure realizes the synchronous acquisition of temperature data and acoustic wave signals, and the spatial accuracy of the measurement data is ensured through the axis alignment design.

[0019] Optionally, a sealing groove matching the inner wall of the cooling chamber shell is provided on the edge of the partition, and a high-temperature resistant rubber sealing strip is embedded in the sealing groove.

[0020] Through the above scheme, the high temperature resistant rubber sealing strip cooperates with the precision machined trough body to maintain the sealing reliability of the chamber separation under dynamic thermal stress.

[0021] In summary, this application includes the following beneficial technical effects: 1. The present invention provides a cooling chamber housing, a first heat sink, a partition and other components, and divides the cooling chamber housing into a front chamber and a rear chamber by the partition, and combines the reverse flow design of the one-way valve pipeline, so that the liquid cooling medium can form a directional circulation between the front chamber and the rear chamber. The radial distribution structure of the first heat sink increases the heat exchange area between the cooling medium and the high temperature environment of the flue body, and cooperates with the annular closed structure of the cooling chamber housing, so that the device can efficiently take away the heat from the temperature measurement area through the circulation of the liquid medium, thereby achieving the effect that the device can effectively cool down the high temperature environment in the flue through the dual heat dissipation structure.

[0022] 2. The present invention provides components such as a heat conducting pipe, a second heat sink, and a temperature measuring device body, and through a sealed connection structure between the heat conducting pipe and the heat exchange cavity shell, in conjunction with the wavy heat dissipation pattern design of the second heat sink, the temperature measuring device body can conduct the internal temperature of the flue to the heat exchange cavity shell through the heat conducting pipe. The heat conducting pipe and the flue body are arranged at an angle of 45-90 degrees to ensure that the sound wave transmitting end of the temperature measuring device body can be vertically pointed to the flue axis, thereby achieving the effect that the device can accurately measure the temperature field in the flue through a multi-angle heat conducting structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure in the embodiment of the present application; Figure 2 It is a schematic diagram of a local structure in an embodiment of the present application; Figure 3 It is a schematic diagram of the local structure of the cooling mechanism in the embodiment of the present application; Figure 4 It is a schematic diagram of the installation of the local structure of the cooling mechanism in the embodiment of the present application; Reference numerals: 1, opposed boiler body; 2, flue gas duct body; 3, cooling mechanism; 301, positioning ring; 302, cooling cavity housing; 303, first heat sink; 304, sealing ring; 305, heat exchange cavity housing; 306, sealing cover plate; 307, flange; 308, heat conduction tube; 309, temperature measuring device body; 310, second heat sink; 311, partition board. Detailed implementation mode

[0024] The following will further elaborate on the present application in conjunction with the attached Figures 1-4 drawings.

[0025] The embodiment of the present application discloses an opposed boiler acoustic wave temperature measurement and sampling device.

[0026] Please refer to Figure 1 , an opposed boiler acoustic wave temperature measurement and sampling device, including an opposed boiler body 1, a flue gas duct body 2 is arranged at the top of the opposed boiler body 1, and a cooling mechanism 3 is arranged on the side wall of the flue gas duct body 2; Please refer to Figures 2 to 4 , the cooling mechanism 3, the cooling mechanism 3 includes a positioning ring 301, a cooling cavity housing 302, a sealing ring 304 and a partition board 311. The positioning ring 301 is fixedly connected to the side wall of the flue gas duct body 2. An annular cooling cavity housing 302 is fixedly sleeved on the outside of the positioning ring 301. A plurality of first heat sinks 303 are evenly distributed in the inner cavity of the cooling cavity housing 302. A sealing ring 304 is fixedly installed at the axial end of the cooling cavity housing 302. A partition board 311 is fixedly connected to the end face of the sealing ring 304. The partition board 311 divides the inner cavity of the cooling cavity housing 302 into a front chamber and a rear chamber. The front chamber and the rear chamber are respectively communicated with a heat exchange cavity housing 305 through pipes provided with one-way valves, and the flow direction of the one-way valve in the pipe connecting the front chamber is opposite to the flow direction of the one-way valve in the pipe connecting the rear chamber.

[0027] The cooling mechanism 3 further includes a heat exchange cavity housing 305, a sealing cover plate 306, a flange 307, a heat conduction tube 308, a temperature measuring device body 309 and a second heat sink 310. The heat exchange cavity housing 305 is fixedly installed on the side wall of the flue gas duct body 2. A sealing cover plate 306 is fixedly connected to the opening end of the heat exchange cavity housing 305. A plurality of heat conduction tubes 308 are arranged in parallel in the inner cavity of the heat exchange cavity housing 305. Flanges 307 are fixedly installed at the ends of the respective heat conduction tubes 308. A temperature measuring device body 309 is fixedly installed in the inner cavity of the heat conduction tube 308. A plurality of second heat sinks 310 are evenly distributed on the outer surface of the heat conduction tube 308.

[0028] The heat exchange chamber housing 305 and the sealing cover plate 306 together form a closed heat exchange cavity. The heat exchange cavity is respectively communicated with the front chamber and the rear chamber of the cooling chamber housing 302 through two pipelines on the side wall of the cooling chamber housing 302 to form a circulating cooling loop.

[0029] The cooling chamber housing 302 is a hollow annular structure, and a liquid cooling medium is filled in its annular inner cavity. The first heat dissipation fins 303 are evenly distributed radially along the cooling chamber housing 302.

[0030] The axis direction of the heat conduction tube 308 is arranged at an angle of 45 - 90 degrees with the axis direction of the flue body 2, and wavy heat dissipation patterns are provided on the surfaces of the heat conduction tube 308 and the second heat dissipation fins 310.

[0031] The flange 307 is provided with mounting holes corresponding to the number of the heat conduction tubes 308. Thread structures matching the outer diameter of the heat conduction tubes 308 are provided on the inner walls of the mounting holes. The flange 307 is fixedly connected to the end face of the heat exchange chamber housing 305 through bolts.

[0032] The temperature measuring device body 309 includes a temperature sensor and an acoustic wave generator. The detection end of the temperature sensor extends to the central axis position of the heat conduction tube 308, and the emission end of the acoustic wave generator is arranged towards the axis direction of the flue body 2.

[0033] Sealing grooves matching the inner wall of the cooling chamber housing 302 are provided at the edge of the partition plate 311, and high-temperature resistant rubber sealing strips are embedded in the sealing grooves.

[0034] It should be further explained that: The cooling mechanism 3 is mainly composed of an annular cooling chamber housing 302, radially distributed heat dissipation fins and a partition plate 311. Its core function is to construct a double-circulating heat dissipation system. A liquid medium is filled in the cooling chamber housing 302, and the cavity is divided into two independent front and rear chambers by the partition plate 311, and a circulating path of hot and cold alternation is formed in cooperation with the reverse one-way valve pipeline. When high-temperature flue gas in the flue passes through, the liquid medium continuously absorbs heat during the flowing process. The radially distributed first heat dissipation fins 303 can increase the heat exchange area by more than 30%. In cooperation with the annular structure of the cooling chamber housing 302, the heat is quickly diffused to the surrounding environment through conduction and convection. This design can stably control the temperature of the temperature measuring area within the tolerance range of the sensor, avoid the local overheating problem caused by traditional single-point cooling, and ensure the long-term reliable operation of the device.

[0035] The heat-conducting pipe 308 is inserted into the flue at an inclined angle. The surface with wavy heat dissipation lines and the second heat sink 310 work together to efficiently absorb the heat of the flue gas and conduct it to the heat exchange chamber housing 305. The temperature measurement device body 309 integrates a temperature sensor and an acoustic wave generator. The sensor is located at the center of the heat-conducting pipe 308 to obtain accurate temperature data, and the acoustic wave generator is vertically directed towards the axis of the flue to achieve three-dimensional scanning of the temperature field. The heat exchange chamber housing 305 and the cooling chamber housing 302 are connected by a closed-loop pipeline, and the absorbed heat is discharged through the circulation of the liquid medium. This structure not only solves the problem of the tolerance of the sensor in a high-temperature environment but also realizes three-dimensional monitoring of the temperature field in the flue through multi-angle heat conduction design. Compared with the traditional single-point measurement method, the measurement accuracy is improved by 25%, and the coverage range is expanded by 50%.

[0036] The implementation principle of the acoustic wave temperature measurement and sampling device for a counter-flow boiler in an embodiment of this application is as follows: First, the heat-conducting pipe 308 is obliquely inserted into the flue body 2 at an angle of 45 - 90 degrees. Its end flange 307 is hermetically fixed to the heat exchange chamber housing 305 through bolts. The detection end of the temperature sensor of the temperature measurement device body 309 reaches the center of the heat-conducting pipe 308, and the emission end of the acoustic wave generator is aligned with the axis of the flue. At this time, the wavy second heat sink 310 on the surface of the heat-conducting pipe 308 is in direct contact with the high-temperature flue gas, and the initial heat conduction is started.

[0037] Second, the liquid medium in the cooling chamber housing 302 flows between the front chamber and the rear chamber through a reverse check valve pipeline: the medium in the front chamber flows into the heat exchange chamber housing 305 through the pipeline to absorb the heat of the heat-conducting pipe 308, and the medium in the rear chamber flows back from the heat exchange chamber to the cooling chamber. The sealing groove of the partition plate 311 cooperates with the high-temperature resistant sealing strip to ensure the independent circulation of the two chambers, forming a closed loop of "heat absorption - heat dissipation" alternation. The radially arranged first heat sink 303 increases the heat exchange area between the cooling chamber and the outside, accelerating the cooling of the medium.

[0038] Then, the temperature sensor continuously collects the temperature at the center of the heat-conducting pipe 308 to represent the temperature at the flue gas contact point. The acoustic wave generator emits acoustic waves towards the axis of the flue. By measuring the time difference of the acoustic wave propagation at different temperature gradients and combining the arrangement of the heat-conducting pipes 308 at an angle of 45 - 90 degrees with multiple angles, a three-dimensional model of the temperature field of the flue cross-section is constructed. The wavy heat dissipation lines enhance the turbulence on the surface of the heat-conducting pipe 308, making the temperature distribution more uniform and improving the measurement accuracy.

[0039] Next, the high-temperature medium that has absorbed heat flows back from the heat exchange chamber to the rear chamber of the cooling chamber, radiates heat and cools down through the first heat sink 303, and then flows into the front chamber through the check valve, repeating the cycle of "heat absorption in the rear chamber - heat dissipation in the front chamber". This design makes the temperature of the cooling medium always 15 - 20 °C lower than that of the heat-conducting pipe 308, forming a continuous thermosiphon effect, ensuring that the temperature at the root of the heat-conducting pipe 308 in the temperature measurement area is stable within the tolerance threshold of the sensor below 60 °C.

[0040] Finally, the sealed structure of the sealing cover plate 306 and the heat exchange chamber housing 305 prevents flue gas leakage. The double-chamber design of the partition plate 311 avoids medium short-circuit. When the flue load changes, the natural convection of the liquid medium and the passive heat dissipation of the heat sink automatically adapt to the heat load without external power. The acoustic temperature measurement data is transmitted to the control room in real time. The cooling system continuously ensures that the device operates continuously for ≥8000 hours in a flue gas environment above 800°C through medium circulation.

[0041] The above are all preferred embodiments of this application, and the protection scope of this application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. A sonic temperature measurement and sampling device for an opposed fired boiler, comprising an opposed fired boiler body (1), characterized in that: A flue gas duct body (2) is arranged at the top of the hedging boiler body (1), and a cooling mechanism (3) is arranged on the side wall of the flue gas duct body (2); Cooling mechanism (3), the cooling mechanism (3) includes a positioning ring (301), a cooling chamber housing (302), a sealing ring (304) and a partition plate (311). The positioning ring (301) is fixedly connected to the side wall of the flue gas duct body (2). An annular cooling chamber housing (302) is fixedly sleeved on the outer side of the positioning ring (301). A plurality of first heat dissipation fins (303) are evenly distributed in the inner cavity of the cooling chamber housing (302). A sealing ring (304) is fixedly installed at the axial end of the cooling chamber housing (302). A partition plate (311) is fixedly connected to the end face of the sealing ring (304). The partition plate (311) divides the inner cavity of the cooling chamber housing (302) into a front chamber and a rear chamber. The front chamber and the rear chamber are respectively communicated with a heat exchange chamber housing (305) through pipes provided with one-way valves, and the flow direction of the one-way valve in the pipe connecting the front chamber is opposite to the flow direction of the one-way valve in the pipe connecting the rear chamber.

2. The sonic temperature measurement and sampling device for a hedging boiler according to claim 1, wherein: The cooling mechanism (3) further includes a heat exchange chamber housing (305), a sealing cover plate (306), a flange plate (307), a heat conduction pipe (308), a temperature measuring device body (309) and a second heat dissipation fin (310). The heat exchange chamber housing (305) is fixedly installed on the side wall of the flue gas duct body (2). A sealing cover plate (306) is fixedly connected to the opening end of the heat exchange chamber housing (305). A plurality of heat conduction pipes (308) are arranged in parallel in the inner cavity of the heat exchange chamber housing (305). Flange plates (307) are fixedly installed at the ends of the heat conduction pipes (308). A temperature measuring device body (309) is fixedly installed in the inner cavity of the heat conduction pipe (308). A plurality of second heat dissipation fins (310) are evenly distributed on the outer surface of the heat conduction pipe (308).

3. The acoustic temperature measurement and sampling device for a hedging boiler according to claim 2, characterized in that: The heat exchange chamber housing (305) and the sealing cover plate (306) together form a closed heat exchange cavity, and the heat exchange cavity is respectively communicated with the front chamber and the rear chamber of the cooling chamber housing (302) through two pipes on the side wall of the cooling chamber housing (302) to form a circulating cooling loop.

4. The sonic temperature measurement and sampling device for a hedging boiler according to claim 1, wherein: The cooling chamber housing (302) is of a hollow annular structure, and a liquid cooling medium is filled in its annular inner cavity. The first heat dissipation fins (303) are evenly distributed radially along the cooling chamber housing (302).

5. The sonic temperature measurement and sampling device for a hedging boiler according to claim 2, characterized in that: The axial direction of the heat conduction pipe (308) is arranged at an angle of 45 - 90 degrees with the axial direction of the flue gas duct body (2), and wavy heat dissipation patterns are provided on the surfaces of the heat conduction pipe (308) and the second heat dissipation fins (310).

6. The sonic temperature measurement and sampling device for a hedging boiler according to claim 2, wherein: The flange plate (307) is provided with mounting holes corresponding to the number of the heat conduction pipes (308). Thread structures matching the outer diameter of the heat conduction pipe (308) are provided on the inner walls of the mounting holes. The flange plate (307) is fixedly connected to the end face of the heat exchange chamber housing (305) through bolts.

7. The sonic temperature measurement and sampling device for a hedging boiler according to claim 2, characterized in that: The temperature measuring device body (309) includes a temperature sensor and an acoustic wave generator. The detection end of the temperature sensor extends to the central axis position of the heat conduction tube (308), and the emission end of the acoustic wave generator is arranged towards the axis direction of the flue body (2).

8. The sonic temperature measurement and sampling device for a hedging boiler according to claim 1, wherein: The edge of the partition plate (311) is provided with a sealing groove matching the inner wall of the cooling cavity housing (302), and a high-temperature resistant rubber sealing strip is embedded in the sealing groove.

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