Molten salt temperature and pressure transmitter

Abstract

The invention discloses a fused salt temperature and pressure transmitter, which relates to the field of temperature and pressure measuring devices and comprises a hollow columnar shell, a partition plate positioned in the shell, a temperature acquisition component mounted on the partition plate and an acquisition terminal mounted at the acquisition end of the shell, the pressure guiding and conducting assembly is located in the shell, the pressure collecting assembly is installed in the shell and matched with the pressure guiding and conducting assembly in a connected mode, the shell plate divides the inner space of the shell into a collecting area and a cooling area, and the collecting terminal is provided with at least one air inlet channel connected with the collecting area. The gas inlet channel introduces a gas phase medium in the molten salt area into the collection area, the temperature collection assembly in the collection area obtains temperature information, in addition, the partition plate is further provided with an open hole communicated with the pressure guide and conduction assembly, and the open hole introduces the gas phase medium in the collection area into the pressure guide and conduction assembly. Compared with the prior art, by means of the collaborative design of composite heat insulation and forced heat conduction, stable acquisition of pressure signals is achieved in a high-temperature environment. The spiral pressure guide pipe forms an efficient heat dissipation path, so that the high-temperature gas is quickly cooled to a safe working range of the sensor.

Description

Technical Field

[0001] This application relates to the field of temperature and pressure measurement devices, in particular to a molten salt temperature and pressure transmitter. Background Art

[0002] In the field of pressure monitoring of high-temperature molten salt thermal energy storage systems, the core bottleneck faced by domestic existing technologies lies in the insufficient temperature resistance of sensor materials. Currently, domestic pressure sensors generally use 304 or 316L stainless steel as the packaging material for sensitive components, and their upper limit of long-term working temperature is 350 - 400 °C. When the molten salt temperature reaches above 500 °C, the grain boundary slip inside the stainless steel material intensifies, and the yield strength decreases by more than 50% (for example, the yield strength of 316L at 550 °C drops from 205 MPa at room temperature to 85 MPa), resulting in irreversible plastic deformation of the diaphragm under the action of molten salt static pressure. The measured data shows that the zero drift of such sensors can reach 3% of the full scale after continuous operation for 200 hours, far exceeding the accuracy requirement of 0.5% for industrial-grade sensors. Although some domestic improvement solutions attempt to introduce superalloys (such as GH3128 nickel-based alloy), its temperature resistance limit is only increased to 480 °C, still unable to cover the typical working conditions above 550 °C in the molten salt system. More critically, the long-term stability problem of domestic sensors at high temperatures is prominent: when the temperature exceeds 450 °C, the penetration rate of chloride ions in the molten salt accelerates, the passivation film on the surface of stainless steel or nickel-based alloy is damaged, and the local corrosion rate surges from 0.01 mm / year at room temperature to 0.5 mm / year, directly causing diaphragm perforation or seal failure. Such material property defects result in the average lifespan of domestic sensors being less than 1 / 3 of that of imported products (the lifespan of imported special sensors is about 8000 hours, while that of domestic similar products is only 2500 hours), forcing system operators to rely on expensive imported equipment (the unit price of imported sensors is about 6 - 8 times that of domestic standards).

[0003] The deficiencies of the prior art not only stem from the temperature resistance limit of materials, but are also closely related to the multi-physical field coupling effect in high-temperature environments. For example, domestic sensors mostly adopt a single-layer metal diaphragm structure. In high temperatures above 500 °C, the difference in the thermal expansion coefficient between the diaphragm and the sensor housing material will lead to concentrated assembly stress. Measured data shows that for every 100 °C increase in temperature, the micro-displacement between the diaphragm and the housing increases by 0.05 mm, causing the linearity error of the sensor to expand from 0.1% to 0.8%. In addition, the signal conditioning circuits of domestic sensors usually use commercial-grade electronic components, and their temperature resistance levels are generally 85 - 125 °C. When the temperature of the sensor body rises above 200 °C through heat conduction, the parameter drift of resistors and capacitors on the circuit board exceeds 30% of the nominal value, resulting in distorted pressure signal output. These problems are particularly prominent in the scenario of monitoring the environmental pressure of molten salt storage tanks: Although the temperature in the gas phase space of the storage tank is lower than that of the molten salt medium itself (about 300 - 400 °C), traditional contact sensors still need to be coupled with the high-temperature area through mechanical connectors, and the heat conduction path makes the actual working temperature of the sensor still close to the molten salt temperature, resulting in the unstable operation of domestic equipment. Summary of the Invention

[0004] The purpose of this application aims to at least overcome one deficiency existing in the prior art, and provides a molten salt temperature and pressure transmitter. This molten salt temperature and pressure transmitter controls the temperature value of the measured medium by cooling, reduces the temperature resistance requirement for the pressure sensor, and reduces the cost of the measuring equipment.

[0005] To achieve the above purpose, this application discloses a molten salt temperature and pressure transmitter, which includes a hollow columnar housing, a partition located inside the housing, a temperature acquisition component installed on the partition, an acquisition terminal installed at the acquisition end of the housing, a pressure conduction component located inside the housing, and a pressure acquisition component installed inside the housing and mating with the pressure conduction component. Among them, the housing plate divides the internal space of the housing into an acquisition area and a cooling area. The acquisition terminal has at least one air inlet channel connected to the acquisition area, and this air inlet channel introduces the gas-phase medium in the molten salt area into the acquisition area. The temperature acquisition component in the acquisition area obtains temperature information. In addition, an opening communicating with the pressure conduction component is provided on the partition, and this opening introduces the gas-phase medium in the acquisition area into the pressure conduction component. The pressure conduction component includes a spiral rigid pipe. One end of the rigid pipe is connected to the opening, and the other end is connected to the pressure acquisition component. The gas-phase medium is cooled through the rigid pipe to meet the working temperature requirement of the pressure acquisition component and prevent the pressure acquisition component from being damaged by high temperature.

[0006] Further, the housing is a high-temperature resistant metal housing.

[0007] Further, the acquisition terminal is detachably installed at the acquisition end of the housing.

[0008] Furthermore, the shell is provided with at least one group of openings for gas circulation in the cooling zone.

[0009] Furthermore, the partition is a composite partition, including a surface layer for installing the temperature collection component and a heat insulation layer for achieving heat insulation.

[0010] Furthermore, a hollow shaft is provided in the cooling zone, and the hollow shaft is inserted into and connected to the rigid pipe to improve the structural stability of the rigid pipe.

[0011] Furthermore, the signal of the temperature acquisition component passes through the hollow shaft and is led out of the shell.

[0012] Furthermore, the temperature acquisition component comprises a plurality of temperature sensors arranged on the partition.

[0013] Furthermore, the pipe wall of the rigid pipe is a composite structure, including a main structural layer and a heat dissipation layer sprayed on the outer surface of the main structural layer.

[0014] Furthermore, the outer wall surface of the rigid pipe is provided with a temperature sensor for detecting the temperature of the rigid pipe.

[0015] Furthermore, a temperature sensor for detecting the temperature of the gas phase medium in the pipeline body is provided inside the rigid pipeline.

[0016] Furthermore, the opening on the partition is provided with an electrically controlled valve, and when the temperature of the gas phase medium in the rigid pipeline exceeds a preset threshold, the electrically controlled valve is closed to prevent damage to the pressure collection unit.

[0017] Furthermore, the pressure acquisition unit includes at least one pressure sensor.

[0018] Furthermore, the temperature acquisition component includes a plurality of temperature sensors using the platinum resistance principle, each sensor is embedded in a circular array on the surface of the composite partition facing the collection area, and adopts a high-temperature resistant ceramic packaging structure, and its temperature sensing end protrudes 0.5-1.2mm from the partition surface to directly contact the circulating gas. A redundant parallel circuit design is adopted between each temperature sensor, and the signal line adopts a double-layer shielding structure, the inner layer is a polyimide insulation layer, the outer layer is coated with a metal braided anti-electromagnetic interference shielding layer, and is centrally led out through a ceramic insulation conduit preset inside the hollow shaft.

[0019] Furthermore, the pressure collection assembly includes two sets of independently working piezoresistive pressure sensor modules, which adopt a fully welded stainless steel diaphragm structure and are filled with high-temperature silicone oil as a pressure transmission medium. The sensor module is fixed at the end of the cooling zone, and its pressure surface is connected to the outlet of the spiral rigid pipe.

[0020] Compared with the prior art, through the collaborative design of composite heat insulation and forced heat conduction, this application realizes the stable acquisition of pressure signals in a high-temperature environment. The spiral pressure guide tube forms an efficient heat dissipation path, quickly cooling the high-temperature gas to the safe operating range of the sensor. The design of the detachable structure and the safety protection device not only ensures the maintenance convenience of the equipment but also guarantees the long-term reliable operation of the system under extreme working conditions. This solution effectively solves the problem of the influence of high-temperature environment on the pressure measurement system by optimizing the heat conduction path and mechanical structure.

[0021] The beneficial effects listed above do not exhaust all advantages. Other potential beneficial effects and detailed technical implementation manners will be further disclosed in the embodiments or other description parts of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] After reading the following specific implementation manners in conjunction with the drawings, various aspects of the present disclosure will be better understood. In the drawings, the positions, dimensions, and ranges of various structures shown sometimes do not represent the actual positions, dimensions, and ranges, etc. In the drawings: Figure 1 is a schematic structural diagram of an embodiment disclosed in this application.

[0023] Figure 2 is a schematic cross-sectional structure diagram of the acquisition terminal in an embodiment disclosed in this application.

[0024] Figure 3 is a schematic structural diagram of the backing plate in an embodiment disclosed in this application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following will describe the present disclosure with reference to the drawings, in which several embodiments of the present disclosure are shown. However, it should be understood that the present disclosure can be presented in many different ways and is not limited to the embodiments described below; in fact, the embodiments described below are intended to make the disclosure of the present disclosure more complete and fully explain the protection scope of the present disclosure to those skilled in the art. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide more additional embodiments.

[0026] It should be understood that in all the drawings, the same reference numerals represent the same elements. In the drawings, for clarity, the dimensions of some features may be deformed.

[0027] It should be understood that the terms in the specification are only used to describe specific embodiments and are not intended to limit the present disclosure. All terms used in the specification (including technical terms and scientific terms) have the meanings commonly understood by those skilled in the art unless otherwise defined. For the sake of simplicity and / or clarity, technologies, methods, and devices known to those of ordinary skill in the relevant fields may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorized specification.

[0028] The singular forms "a", "the", and "said" used in the specification include the plural forms unless clearly specified. The terms "comprising", "including", and "containing" used in the specification indicate the presence of the claimed features, but do not exclude the presence of one or more other features. The term "and / or" used in the specification includes any and all combinations of one or more of the related listed items.

[0029] Referring to the attached Figures 1 to 3 , the following is an embodiment of a molten salt temperature and pressure transmitter generated according to the technical content you provided: This embodiment relates to a molten salt temperature and pressure transmitter, whose main structure is composed of a hollow columnar housing 1, a partition plate 2, a temperature acquisition component 3, acquisition terminals 4, a pressure conduction component 5, and a pressure acquisition component 6. Each component is interrelated and works together to achieve precise monitoring of the temperature and pressure in the molten salt area.

[0030] Specifically, the housing 1 is made of high-temperature-resistant metal material, with the characteristics of being strong and durable and able to resist the high-temperature erosion of molten salt. Preferably, a heat-insulating layer is provided on the outer wall surface of the housing 1.

[0031] The partition plate 2 is installed inside the housing 1, cleverly dividing the inner cavity of the housing 1 into two areas. The side closer to the acquisition end is the acquisition area 7, and the other side is the cooling area 8. The acquisition terminals 4 are detachably installed at the acquisition end of the housing 1 facing the molten salt area, and at least one air inlet channel 9 is designed thereon. These air inlet channels 9 are connected to the acquisition area 7 and serve as the key channels for introducing the gas-phase medium in the molten salt area into the acquisition area 7.

[0032] The temperature acquisition component 3 is arranged in the acquisition area. When the gas-phase medium flows into the acquisition area, the temperature acquisition component can immediately capture and obtain the temperature information, providing the original data for subsequent temperature monitoring.

[0033] In this embodiment, the temperature acquisition component 3 is specifically composed of multiple temperature sensors. Each sensor follows the platinum resistance principle and is embedded in the surface of the partition plate 2 facing the acquisition area 7 in a circular array manner, and its high-temperature resistance performance is improved by using a high-temperature-resistant ceramic encapsulation structure. The temperature-sensing end protrudes moderately from the surface of the partition plate by 0.5 - 1.2 mm, facilitating direct contact with the flowing gas to ensure the accuracy and timeliness of temperature acquisition.

[0034] In this embodiment, the partition 2 is a composite partition, which is composed of a surface layer and a heat insulation layer. The surface layer is used to firmly install the temperature collection component 3, while the heat insulation layer plays a role in blocking heat transfer, reducing the rate of heat transfer from the collection area 7 to the cooling area 8, and maintaining the temperature difference between the two areas stable. Openings 10 are also provided on the partition 2, and these openings 10 are connected to the pressure-conducting component 5, so that the gas phase medium in the collection area 7 can flow smoothly into the pressure-conducting component 5.

[0035] The pressure-conducting component 5 located in the cooling zone 8 adopts a spiral rigid pipe, whose pipe wall is a composite structure, containing a main structural layer, and a heat dissipation layer sprayed on the outer surface. One end of the rigid pipe is tightly connected to the opening 10 on the partition 2, and the other end is connected to the pressure collection component 6. When the gaseous medium flows into the rigid pipe, the heat dissipation layer continues to dissipate heat outward during the flow in the rigid spiral pipe, achieving preliminary cooling treatment of the gas, so that its temperature drops to meet the working temperature requirements of the pressure collection component 6, and effectively protects the pressure collection component and avoids high-temperature damage. At the same time, the outer wall surface and the interior of the rigid pipe are respectively provided with temperature sensors for detecting the temperature of the pipe body and the temperature of the gaseous medium, which can accurately monitor the temperature of the pipe itself and the medium in real time for subsequent regulation.

[0036] In order to achieve the need of cooling, the shell 1 is provided with a plurality of openings on the cooling area 9 for circulating heat exchange with external air.

[0037] In order to enhance the structural stability of the rigid pipe, a hollow shaft 11 is created in the cooling zone 8, which is inserted and connected to the rigid pipe. Moreover, the signal of the temperature acquisition component 3 passes through the hollow shaft 11 and then leads out of the housing, which cleverly utilizes the hollow shaft 11, while improving the structural stability without affecting the signal transmission.

[0038] More specifically, a redundant parallel circuit design is adopted between each temperature sensor, and the signal line adopts a double-layer shielding structure. The inner layer is a polyimide insulation layer, and the outer layer is covered with a metal braided anti-electromagnetic interference shielding layer. It is centrally led out through a ceramic insulating conduit preset inside the hollow shaft 11, which can not only ensure the stability of signal transmission, but also effectively resist external electromagnetic interference.

[0039] In this embodiment, the pressure acquisition component 6 includes two sets of independently working piezoresistive pressure sensor modules, each module adopts a fully welded stainless steel diaphragm structure, and is filled with high-temperature silicone oil as a pressure transmission medium. The module is fixed at the end of the cooling zone 8, and the pressure surface is precisely connected to the outlet of the spiral rigid pipe. When the gas phase medium that has been cooled acts on the pressure surface of the pressure sensor module from the outlet of the rigid pipe, the module can sensitively sense the pressure change and convert the pressure signal into an electrical signal for output.

[0040] Based on the above structure, in this embodiment, an electrically controlled valve is also provided at the opening 10 on the partition plate 2. Once the temperature of the gas-phase medium in the rigid pipeline exceeds the preset safety threshold, the electrically controlled valve immediately responds and automatically closes to block the continuous flow of high-temperature gas to the pressure acquisition component 6, comprehensively ensuring the safety of the pressure acquisition component.

[0041] In the actual application of the molten salt temperature and pressure transmitter, when it is necessary to monitor the temperature and pressure in the molten salt area, the gas-phase medium first enters the intake channel of the acquisition terminal 4 and then surges into the acquisition area 7. The temperature acquisition component 3 located in the acquisition area 7 quickly responds, and multiple temperature sensors start working simultaneously. With their temperature-sensing ends protruding from the partition plate, they can real-time sense the temperature of the gas-phase medium, and the acquired temperature data is transmitted to the external control system via the signal line. At the same time, part of the gas-phase medium flows into the spiral rigid pipeline of the pressure conduction component 5 through the opening 10 on the partition plate 2. When moving along the spiral path in the pipeline, the heat dissipation layer continuously dissipates heat to reduce the gas temperature. The outer wall of the rigid pipeline and the internal temperature sensors constantly monitor the temperature change. Once it is found that the temperature of the gas-phase medium in the pipeline is too high, the electrically controlled valve immediately closes to stop the gas flow and prevent the high temperature from damaging the pressure acquisition component 3. After the gas temperature drops to a reasonable range, the electrically controlled valve reopens, and the cooled gas-phase medium reaches the pressure acquisition component 6. Two piezoresistive pressure sensor modules accurately sense the pressure and convert the pressure signal into an electrical signal and output it to the external control system. The entire device relies on the reasonable layout and close cooperation of each component to stably and reliably complete the acquisition and monitoring tasks of the temperature and pressure in the molten salt area, showing extremely high practical value and application prospects in the field of high-temperature molten salt environment monitoring, and effectively assisting the precise regulation and safe operation and maintenance of related production processes.

[0042] Although the exemplary embodiments of the present disclosure have been described, those skilled in the art should understand that various changes and modifications can be made to the exemplary embodiments of the present disclosure without substantially departing from the spirit and scope of the present disclosure. Therefore, all changes and modifications are included in the protection scope of the present disclosure defined by the claims. The present disclosure is defined by the appended claims, and equivalents of these claims are also included.

Claims

1. A molten salt temperature and pressure transmitter, characterized in that, It includes a hollow columnar housing, a partition located inside the housing, a temperature acquisition component installed on the partition, a collection terminal installed at the acquisition end of the housing, a pressure conduction component located inside the housing, and a pressure acquisition component installed inside the housing and connected and cooperated with the pressure conduction component. Among them, the housing plate divides the internal space of the housing into an acquisition area and a cooling area. The collection terminal has at least one air intake channel connected to the acquisition area, and this air intake channel introduces the gas-phase medium in the molten salt area into the acquisition area. The temperature acquisition component in the acquisition area obtains temperature information. In addition, there is an opening on the partition that is connected and communicated with the pressure conduction component, and this opening introduces the gas-phase medium in the acquisition area into the pressure conduction component. The pressure conduction component includes a spiral rigid pipe. One end of the rigid pipe is connected to the opening, and the other end is connected to the pressure acquisition component. The gas-phase medium is cooled through the rigid pipe.

2. A molten salt temperature and pressure transmitter as described in claim 1, wherein The housing is a high-temperature-resistant metal housing.

3. A molten salt temperature and pressure transmitter as described in claim 1, characterized in that, The collection terminal is detachably installed at the acquisition end of the housing.

4. A molten salt temperature and pressure transmitter as described in claim 1, characterized in that, The housing is provided with at least one set of openings for gas circulation in the cooling area.

5. A molten salt temperature and pressure transmitter as described in claim 1, characterized in that, The partition is a composite partition, including a surface layer for installing the temperature acquisition component and a heat insulation layer for realizing heat insulation.

6. A molten salt temperature and pressure transmitter as described in claim 1, wherein A hollow shaft rod is provided in the cooling area, and the hollow shaft rod is inserted and connected to the rigid pipe.

7. A molten salt temperature and pressure transmitter as described in claim 1, characterized in that, The signal of the temperature acquisition component passes through the hollow shaft rod and leads out of the housing.

8. A molten salt temperature and pressure transmitter as described in claim 1, characterized in that, The temperature acquisition component is composed of a plurality of temperature sensors arranged on the partition.

9. A molten salt temperature and pressure transmitter as described in claim 1, wherein, The pipe wall of the rigid pipe is a composite structure, including a main structure layer and a heat dissipation layer sprayed on the outer surface of the main structure layer.

10. A molten salt temperature and pressure transmitter as described in claim 1, characterized in that, A temperature sensor for detecting the temperature of the rigid pipe is provided on the outer wall surface of the rigid pipe; a temperature sensor for detecting the temperature of the gas-phase medium in the pipe body is provided inside the rigid pipe; an electric control valve is provided at the opening on the partition. When the temperature of the gas-phase medium in the rigid pipe exceeds a preset threshold, the electric control valve closes to prevent damage to the pressure acquisition unit.

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