Device for overtemperature cut-off of entrained air at inlet of air separation device

Abstract

The invention belongs to the technical field of aircraft fuel systems, and particularly relates to a device for overtemperature cut-off of inlet bleed air of an air separation device. One end of an inerting pipeline is connected with an environmental control air source, the other end of the inerting pipeline is connected with an air separation device, and the inerting pipeline is sequentially provided with an inlet air-entraining shut-off valve, an air-entraining heat dissipation assembly and an inerting emergency shut-off valve from upstream to downstream; the first temperature sensor and the second temperature sensor are both arranged on the inerting pipeline between the air entraining heat dissipation assembly and the air separation device; and the controller and the upper computer are used for controlling the inlet bleed air shut-off valve according to data fed back by the first temperature sensor and controlling the inerting emergency shut-off valve according to data fed back by the second temperature sensor when the inlet bleed air shut-off valve cannot be closed. According to the air separation device, double protection measures are adopted, so that the risk that the air separation device experiences high temperature is effectively reduced, the service life of the air separation device is prolonged, and the installation cost is saved.

Description

Technical Field

[0001] The present application belongs to the technical field of aircraft fuel systems, and in particular relates to a device for over-temperature cutoff of bleed air at an inlet of an air separation device. Background Art

[0002] Airborne nitrogen generation technology is a commonly used fuel tank inerting technology. One of the core components of airborne nitrogen generation technology is the air separation unit. The air separation unit separates nitrogen and oxygen through hollow fiber membranes. Nitrogen is filled into the fuel tank and oxygen is discharged out of the aircraft. The performance of the air separation unit is greatly affected by the bleed air temperature. The bleed air temperature needs to be within a certain range to achieve the best performance. Over-temperature bleed air exceeding the temperature in this range will not only reduce the performance of the air separation unit, but also cause permanent damage to the membrane components of the air separation unit.

[0003] At present, the bleed air of the air separation unit is mostly derived from the environmental control system. The temperature of the environmental control air source is relatively high, and the environmental control bleed air needs to be cooled by the bleed air heat dissipation component before it can be sent to the air separation unit. Under the condition of bleed air heat dissipation component failure, the bleed air at the inlet of the air separation unit will overheat and damage the air separation unit. To avoid this situation, under the condition of bleed air overheating, the environmental control air source is cut off by cutting off the inlet bleed air shut-off valve to protect the downstream air separation unit. The existing air separation unit inlet bleed air over-temperature protection measures are single, without redundant design. Under the condition that the inlet bleed air shut-off valve fails and cannot be closed, there is a greater risk of damaging the air separation unit. In addition, the cost of the air separation unit is relatively high, which will cause greater economic losses.

[0004] Therefore, it is desired to have a technical solution to overcome or at least alleviate at least one of the above-mentioned defects of the prior art. Summary of the invention

[0005] The purpose of the present application is to provide a device for over-temperature cutoff of bleed air at the inlet of an air separation unit, so as to solve at least one problem existing in the prior art.

[0006] The technical solution of this application is: A device for over-temperature cutoff of bleed air at an inlet of an air separation unit, comprising: An inerting pipeline, one end of which is connected to the environmental control gas source, and the other end of which is connected to the air separation device. The inerting pipeline is provided with an inlet bleed air shut-off valve, a bleed air heat dissipation component, and an inerting emergency shut-off valve in sequence from upstream to downstream; The temperature sensor comprises a first temperature sensor and a second temperature sensor, wherein the first temperature sensor and the second temperature sensor are both arranged on the inerting pipeline between the bleed air heat dissipation assembly and the air separation device; A controller and a host computer, wherein the controller and the host computer are used to control the inlet bleed air shut-off valve according to data fed back by the first temperature sensor, and to control the inerting emergency shut-off valve according to data fed back by the second temperature sensor when the inlet bleed air shut-off valve cannot be closed.

[0007] In at least one embodiment of the present application, the inlet bleed air shut-off valve is an electromagnetic pressure-driven valve.

[0008] In at least one embodiment of the present application, before the device for over-temperature shutoff of inlet bleed air of an air separation unit is started, the inlet bleed air shut-off valve is in a closed position by default, and the inerting emergency shut-off valve is in an open position by default.

[0009] In at least one embodiment of the present application, one of the first temperature sensor and one of the second temperature sensor are provided.

[0010] In at least one embodiment of the present application, the length of the inerting pipeline between the first temperature sensor and the second temperature sensor is no more than 1 m.

[0011] In at least one embodiment of the present application, When the temperature value fed back by the first temperature sensor is greater than a°C and lasts for more than x seconds, the controller controls the inlet bleed air shut-off valve to close; When the temperature value fed back by the second temperature sensor is greater than (a+a0)°C and lasts for more than (x+x0) seconds, the controller controls the inerting emergency shut-off valve to close, where a0∈[5, 15], x0∈[5, 10].

[0012] In at least one embodiment of the present application, When the temperature value fed back by the first temperature sensor is greater than (a+20)°C and lasts for more than x seconds, the host computer controls the inlet bleed air shut-off valve to close; When the temperature value fed back by the second temperature sensor is greater than (a+20)°C and lasts for more than (x+20) seconds, the host computer controls the inerting emergency shut-off valve to close.

[0013] In at least one embodiment of the present application, a plurality of the first temperature sensor and a plurality of the second temperature sensor are provided.

[0014] In at least one embodiment of the present application, the length of the inerting pipeline between any two of the temperature sensors is no more than 1 m.

[0015] In at least one embodiment of the present application, When the temperature value fed back by any one of the first temperature sensors is greater than a°C and lasts for more than x seconds, the controller controls the inlet bleed air shut-off valve to close; When the temperature value fed back by any one of the second temperature sensors is greater than (a+a0)°C and lasts for more than (x+x0) seconds, the controller controls the inerting emergency shut-off valve to close, where a0∈[5, 15], x0∈[5, 10].

[0016] In at least one embodiment of the present application, When the temperature value fed back by the first temperature sensor is greater than (a+20)°C and lasts for more than x seconds, the host computer controls the inlet bleed air shut-off valve to close; When the temperature value fed back by the second temperature sensor is greater than (a+20)°C and lasts for more than (x+20) seconds, the host computer controls the inerting emergency shut-off valve to close.

[0017] The invention has at least the following beneficial technical effects: The device for over-temperature cutoff of inlet bleed air of the air separation device of the present application effectively reduces the risk of the air separation device experiencing high temperature by setting up double protection measures, increases the service life of the air separation device, and saves installation costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of a device for over-temperature cutoff of bleed air at the inlet of an air separation unit according to one embodiment of the present application.

[0019] in: 1-Environmental control air source; 2-Inlet bleed air shut-off valve; 3-Bleed air heat dissipation component; 4-First temperature sensor; 5-Inerting emergency shut-off valve; 6-Second temperature sensor; 7-Air separation device. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the implementation of this application clearer, the technical scheme in the embodiment of this application will be described in more detail below in conjunction with the drawings in the embodiment of this application. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of this application, not all of them. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain this application, and should not be construed as limitations on this application. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The embodiments of this application are described in detail below in conjunction with the drawings.

[0021] The following is combined with Figure 1 This application is described in further detail.

[0022] The present application provides a device for over-temperature cutoff of bleed air at the inlet of an air separation device, comprising: an inerting pipeline, a temperature sensor, a controller and a host computer.

[0023] Specifically, Figure 1 As shown, one end of the inerting pipeline is connected to the environmental control gas source 1, and the other end is connected to the air separation device 7. The inerting pipeline is provided with an inlet bleed air shut-off valve 2, a bleed air heat dissipation component 3, and an inerting emergency shut-off valve 5 in sequence from upstream to downstream; the temperature sensor includes a first temperature sensor 4 and a second temperature sensor 6, and the first temperature sensor 4 and the second temperature sensor 6 are both provided on the inerting pipeline between the bleed air heat dissipation component 3 and the air separation device 7; the controller and the host computer are backed up by each other, and are both used to control the opening or closing of the inlet bleed air shut-off valve 2 according to the data fed back by the first temperature sensor 4, and to control the inerting emergency shut-off valve 5 according to the data fed back by the second temperature sensor 6 when the inlet bleed air shut-off valve 2 cannot be closed. When the inlet bleed air of the air separation device 7 is over-temperature, the inlet bleed air shut-off valve 2 is first closed to achieve over-temperature protection of the air separation device 7; when the inlet bleed air shut-off valve 2 cannot be closed, the inerting emergency shut-off valve 5 can be closed to achieve over-temperature protection of the air separation device 7.

[0024] The device for cutting off the inlet bleed air of an air separation device when it is over-temperature is disclosed in the present application. The environmental control air source 1 is used to provide high-temperature and high-pressure bleed air. The inlet bleed air shut-off valve 2 is used to control the presence or absence of the environmental control air source 1 and to cut off the environmental control air source 1 when the inlet bleed air of the air separation device 7 is over-temperature. When the bleed air heat dissipation component 3 fails, causing the inlet bleed air of the air separation device 7 to be over-temperature, the environmental control air source 1 can be cut off by closing the inlet bleed air shut-off valve 2, thereby achieving the purpose of protecting the air separation device 7. The bleed air heat dissipation component 3 can achieve heat dissipation through air, fuel or other media, and is used to reduce the temperature of the high-temperature environmental control bleed air to the temperature value corresponding to the optimal performance of the air separation device 7. The first temperature sensor 4 and the second temperature sensor 6 are used to measure the gas temperature in the inerting pipeline downstream of the bleed air radiator component 3, and to provide the inlet bleed air shut-off valve 2 and the inerting emergency shut-off valve 5. The over-temperature control provides design input, wherein the temperature value fed back by the first temperature sensor 4 is used as the design input for the over-temperature closure of the inlet bleed air shut-off valve 2, and the temperature value fed back by the second temperature sensor 6 is used as the design input for the over-temperature closure of the inlet bleed air shut-off valve 2, and the two temperature sensors are arranged as the design inputs for the over-temperature closure of the inlet bleed air shut-off valve 2 and the inerting emergency shut-off valve 5, respectively, which can effectively avoid the occurrence of an over-temperature shut-off failure caused by a failure of a single temperature sensor and a corresponding acquisition circuit; the inerting emergency shut-off valve 5 is used to cut off the inlet bleed air of the air separation device 7 when the inlet bleed air heat dissipation component 3 fails, causing the inlet bleed air of the air separation device 7 to overheat and the inlet bleed air shut-off valve 2 cannot be closed, thereby achieving the purpose of protecting the air separation device 7; the air separation device 7 is used to separate nitrogen and oxygen from air to generate nitrogen-rich gas and oxygen-rich gas.

[0025] In a preferred embodiment of the present application, the inlet air shut-off valve 2 uses an electromagnetic pressure-driven valve. The inlet air shut-off valve 2 can only be opened when power is supplied and a certain air pressure is present, ensuring that the inlet air shut-off valve 2 will be opened only when there is an environmentally controlled air condition, thereby effectively preventing the inlet air shut-off valve 2 from being accidentally opened when there is no environmentally controlled air condition.

[0026] In the device for over-temperature cutoff of inlet bleed air in an air separation device of the present application, before starting, the inlet bleed air shut-off valve 2 is in the closed position by default, and the inerting emergency shut-off valve 5 is in the open position by default.

[0027] In one embodiment of the present application, one first temperature sensor 4 and one second temperature sensor 6 are provided, and are arranged at any position of the inerting pipeline between the bleed air heat dissipation assembly 3 and the air separation device 7. The length of the inerting pipeline between the first temperature sensor 4 and the second temperature sensor 6 is not more than 1m, so as to ensure that the temperature values ​​collected by the two temperature sensors are uniform. In this embodiment, the controller can control the inlet bleed air shut-off valve 2 and the inerting emergency shut-off valve 5 in the following manner: the over-temperature logic of the inlet bleed air shut-off valve 2 is that when the temperature value fed back by the first temperature sensor 4 is greater than a℃ and the duration exceeds x seconds, the controller controls the inlet bleed air shut-off valve 2 to close; the over-temperature logic of the inerting emergency shut-off valve 5 is that when the temperature value fed back by the second temperature sensor 6 is greater than (a+a0)℃ and the duration exceeds (x+x0) seconds, the controller controls the inerting emergency shut-off valve 5 to close, wherein the specific values ​​of a and x can be designed according to actual needs. In this embodiment, a0∈[5,15], x0∈[5,10]. The over-temperature judgment logic of the inert emergency shut-off valve 5 is stricter than that of the inlet bleed air shut-off valve 2. Through this control method, it can be ensured that the inert emergency shut-off valve 5 will be closed only when the inlet bleed air shut-off valve 2 cannot be closed. Advantageously, in order to avoid the two valves being unable to be controlled due to a fault inside the controller, the control logic of the upper computer on the two valves is increased to avoid single-point failures. Specifically, when the temperature value fed back by the first temperature sensor 4 is greater than (a+20)℃ and lasts for more than x seconds, the upper computer controls the inlet bleed air shut-off valve 2 to close; when the temperature value fed back by the second temperature sensor 6 is greater than (a+20)℃ and lasts for more than (x+20) seconds, the upper computer controls the inert emergency shut-off valve 5 to close.

[0028] In another embodiment of the present application, in order to avoid the misjudgment of over-temperature caused by the failure of a single temperature sensor, which leads to the inability to close the inlet bleed air shut-off valve 1 or the inert emergency shut-off valve 5, multiple first temperature sensors 4 and second temperature sensors 6 can be set, and the inlet bleed air shut-off valve 2 or the inert emergency shut-off valve 5 performs over-temperature judgment logic through the temperature values ​​collected by multiple temperature sensors. Similarly, the length of the inert pipeline between any two temperature sensors is controlled within 1m to ensure that the temperature values ​​collected by all temperature sensors are uniform. In this embodiment, when the temperature value fed back by any first temperature sensor 4 is greater than a℃ and lasts for more than x seconds, the controller controls the inlet bleed air shut-off valve 2 to close; when the temperature value fed back by any second temperature sensor 6 is greater than (a+a0)℃ and lasts for more than (x+x0) seconds, the controller controls the inert emergency shut-off valve 5 to close, wherein the specific values ​​of a and x can be designed according to actual needs, a0∈[5,15], x0∈[5,10]. Similarly, the control logic of the upper computer for the two valves is: when the temperature value fed back by the first temperature sensor 4 is greater than (a+20)°C and lasts for more than x seconds, the upper computer controls the inlet air shut-off valve 2 to close; when the temperature value fed back by the second temperature sensor 6 is greater than (a+20)°C and lasts for more than (x+20) seconds, the upper computer controls the inert emergency shut-off valve 5 to close.

[0029] The device for over-temperature cut-off of inlet bleed air of the air separation device of the present application has the following working principle: before opening, the inlet bleed air shut-off valve 2 is in the closed position by default, and the inerting emergency shut-off valve 5 is in the open position by default; when the high-temperature and high-pressure environmental control gas source 1 is available, the inlet bleed air shut-off valve 2 is opened by the controller or the host computer, and the environmental control gas source 1 enters the bleed air heat dissipation component 3, and after the bleed air heat dissipation component 3 dissipates the high-temperature gas, the dissipated gas is sent to the air separation device 7 after passing through the inerting emergency shut-off valve 5; the first temperature sensor 4 and the second temperature sensor 6 are used to measure the bleed air temperature downstream of the bleed air heat dissipation component 3. When the temperature value measured by the first temperature sensor 4 exceeds a°C and lasts for a period of time When it exceeds x seconds, the controller closes the inlet bleed air shut-off valve 2; when the temperature value measured by the second temperature sensor 6 exceeds (a+5~15)℃ and lasts for more than (x+5~10) seconds, the controller closes the inert emergency shut-off valve 5; when the controller cannot close the inlet bleed air shut-off valve 2 and the inert emergency shut-off valve 5, the upper computer controls the inlet bleed air shut-off valve 2 to close when the temperature value fed back by the first temperature sensor 4 is greater than (a+20)℃ and lasts for more than x seconds; when the temperature value fed back by the second temperature sensor 6 is greater than (a+20)℃ and lasts for more than (x+20) seconds, the upper computer controls the inert emergency shut-off valve 5 to close. The over-temperature closing logic of the inlet bleed air shut-off valve 2 and the inert emergency shut-off valve 5 can ensure that the inlet bleed air shut-off valve 2 will trigger the over-temperature closing logic of the inert emergency shut-off valve 5 only when it cannot be closed.

[0030] The device for over-temperature cut-off of the inlet bleed air of the air separation device of the present application can protect the air separation device 7 by closing the inlet bleed air shut-off valve 2 or the inerting emergency shut-off valve 5 when the inlet bleed air of the air separation device 7 is over-temperature. The inerting emergency shut-off valve 5 is used as a backup of the inlet bleed air shut-off valve 2 and is only used when the inlet bleed air shut-off valve 2 cannot be closed. This method can protect the air separation device 7 from over-temperature damage to a greater extent, effectively reduce the risk of the air separation device 7 experiencing high temperature, increase the service life of the air separation device 7, and save the installation cost of the air separation device 7. The two measures are completely independent, and by collecting the temperature values ​​of different temperature sensors as design inputs, the situation where the bleed air cannot be cut off due to failure of a single temperature sensor and acquisition circuit is effectively avoided.

[0031] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A device for over-temperature cutoff of bleed air at the inlet of an air separation unit, characterized in that: include: an inerting pipeline, one end of the inerting pipeline being connected to an environmental control air source (1), and the other end being connected to an air separation device (7), the inerting pipeline being provided with an inlet bleed air shut-off valve (2), a bleed air heat dissipation component (3), and an inerting emergency shut-off valve (5) in sequence from upstream to downstream; A temperature sensor, comprising a first temperature sensor (4) and a second temperature sensor (6), wherein the first temperature sensor (4) and the second temperature sensor (6) are both arranged on the inerting pipeline between the bleed air heat dissipation component (3) and the air separation device (7); A controller and a host computer, the controller and the host computer are used to control the inlet bleed air shut-off valve (2) according to data fed back by the first temperature sensor (4), and to control the inerting emergency shut-off valve (5) according to data fed back by the second temperature sensor (6) when the inlet bleed air shut-off valve (2) cannot be closed.

2. The device for over-temperature cutoff of bleed air at the inlet of an air separation unit according to claim 1, characterized in that: The inlet air shut-off valve (2) is an electromagnetic pressure-driven valve.

3. The device for over-temperature cutoff of bleed air at the inlet of an air separation unit according to claim 1, characterized in that: Before the device for shutting off the inlet bleed air overtemperature of the air separation device is started, the inlet bleed air shut-off valve (2) is in a closed position by default, and the inerting emergency shut-off valve (5) is in an open position by default.

4. The device for over-temperature cutoff of bleed air at the inlet of an air separation unit according to claim 1, characterized in that: One of the first temperature sensor (4) and one of the second temperature sensor (6) are provided.

5. The device for over-temperature cutoff of bleed air at the inlet of an air separation unit according to claim 4, characterized in that: The length of the inerting pipeline between the first temperature sensor (4) and the second temperature sensor (6) is no more than 1 m.

6. The device for over-temperature cutoff of bleed air at the inlet of an air separation unit according to claim 5, characterized in that: When the temperature value fed back by the first temperature sensor (4) is greater than a°C and lasts for more than x seconds, the controller controls the inlet bleed air shut-off valve (2) to close; When the temperature value fed back by the second temperature sensor (6) is greater than (a+a0)°C and lasts for more than (x+x0) seconds, the controller controls the inerting emergency shut-off valve (5) to close, wherein a0∈[5, 15], x0∈[5, 10].

7. The device for over-temperature cutoff of bleed air at the inlet of an air separation unit according to claim 6, characterized in that: When the temperature value fed back by the first temperature sensor (4) is greater than (a+20)°C and lasts for more than x seconds, the host computer controls the inlet bleed air shut-off valve (2) to close; When the temperature value fed back by the second temperature sensor (6) is greater than (a+20)°C and lasts for more than (x+20) seconds, the host computer controls the inerting emergency shut-off valve (5) to close.

8. The device for over-temperature cutoff of bleed air at the inlet of an air separation unit according to claim 1, characterized in that: A plurality of the first temperature sensor (4) and the second temperature sensor (6) are provided.

9. The device for over-temperature cutoff of bleed air at the inlet of an air separation unit according to claim 8, characterized in that: The length of the inerting pipeline between any two of the temperature sensors is no more than 1 m.

10. The device for over-temperature cutoff of bleed air at the inlet of an air separation unit according to claim 9, characterized in that: When the temperature value fed back by any one of the first temperature sensors (4) is greater than a°C and lasts for more than x seconds, the controller controls the inlet bleed air shut-off valve (2) to close; When the temperature value fed back by any one of the second temperature sensors (6) is greater than (a+a0)°C and lasts for more than (x+x0) seconds, the controller controls the inerting emergency shut-off valve (5) to close, wherein a0∈[5, 15], x0∈[5, 10].

11. The device for over-temperature cutoff of bleed air at the inlet of an air separation unit according to claim 10, characterized in that: When the temperature value fed back by the first temperature sensor (4) is greater than (a+20)°C and lasts for more than x seconds, the host computer controls the inlet bleed air shut-off valve (2) to close; When the temperature value fed back by the second temperature sensor (6) is greater than (a+20)°C and lasts for more than (x+20) seconds, the host computer controls the inerting emergency shut-off valve (5) to close.

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