CN207235329U - A kind of airborne open type spray cooling system using ammonia as cooling medium - Google Patents

A kind of airborne open type spray cooling system using ammonia as cooling medium Download PDF

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Publication number
CN207235329U
CN207235329U CN201721127279.5U CN201721127279U CN207235329U CN 207235329 U CN207235329 U CN 207235329U CN 201721127279 U CN201721127279 U CN 201721127279U CN 207235329 U CN207235329 U CN 207235329U
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China
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valve
shut
ammonia
outlet
entrance
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CN201721127279.5U
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Chinese (zh)
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王瑜
邱兰兰
刘金祥
李俊
袁晓磊
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Nanjing Tech University
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Nanjing Tech University
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Abstract

A kind of airborne open type spray cooling system using ammonia as cooling medium, belongs to airborne high heat flux density equipment cooling field.The utility model continues heat dissipation problem mainly for solving the high heat flux density of air environment and facet surface.Mainly include:Liquefied ammonia high pressure storage tank (1), flow control valve (2), first shut-off valve (3), flowmeter (4), nozzle (5), surface (6) to be cooled, spray chamber (7), cold recovery exchanger (8), fuel tank (9), second shut-off valve (10), 3rd shut-off valve (11), Ammonia recovery tank (12), 4th shut-off valve (13), engine bleed port (14), pump (15), catalyst converter (16), external environment port (17).The utility model uses the big liquefied ammonia of the latent heat of vaporization to carry out misting cooling to high-temperature electronic equipment or facet surface as cooling medium, and introduce engine exhaust and reacted with the ammonia after heat exchange, open system stabilization safe for operation, easy to adjust operation, meet the cooling requirement under airborne complex environment.

Description

A kind of airborne open type spray cooling system using ammonia as cooling medium
Technical field
A kind of airborne open type spray cooling system using ammonia as cooling medium is the utility model is related to, belongs to airborne high hot-fluid Density equipment cooling field.
Background technology
With the continuous improvement that aircraft mobility, Stealth Fighter, defending performance require, high power laser light technology, electricity Sub- component is highly integrated to be developed rapidly with technologies such as micromations.2013, U.S. national defense advanced research projects agency authorized Lockheed Martin Corporation installs a prototype laser weapons of system to verification machine.In September, 2015, United States Air Force is announced will Laser weapon is installed additional on AC-130 gunships.Such weapon will produce the heat of MW class after transmitting in several seconds, lead Its surface great thermal force of generation and high heat flow density, its heat flow density order of magnitude is caused to can reach thousands of W/cm2.This Outside, the heat flow density of New Generation Military electronic equipment is up to 107W/cm2, the processor heat output of most significant end is more than 250W/ cm2.If not adopting an effective measure reduces electronic equipment surface temperature, its work efficiency is gently substantially reduced, it is heavy then burn electricity Sub- device, influences flight safety.Therefore, how efficiently and safely to solve the problems, such as the quick heat radiating of airborne equipment has important grind Study carefully meaning.Conventional air-cooled and water-cooling pattern exchange capability of heat has reached capacity, and can not meet increasing electronic equipment and swash The radiating requirements of light device.
Misting cooling is that cooling medium is decomposed into countless discrete type droplets by atomization, is sprayed in heating surface A kind of novel cooling manner of heat is taken away by single-phase heat exchange and two-phase heat exchange, the advantage is that:Less surface temperature difference;Not yet There is boiling hysteresis quality;Good heat exchange property;Uniform cooling wall temperature can be achieved;Working medium demand is small.Misting cooling skill Art has very strong application prospect in airborne equipment cooling field.Application of the spray cooling in airborne field, it is necessary first to Solve the problems, such as that the cooling sustainable use of medium takes with system space.
Existing partial monopoly proposes application process of the misting cooling in airborne field, such as patent ZL201510072716.7 A kind of cooling system of the airborne heater element based on air swell refrigeration is proposed, is mainly characterized by using turbine as refrigeration Device and power source, must can carry out misting cooling first by turbine cold-storage when the program comes into operation, cool-storage time is grown, It can not come into operation at any time;The complicated and device space is big, difficult to install on military aircraft.Patent ZL201510074027.X proposes a kind of cooling system and method for the airborne heater element based on sweat cooling, main feature Indirect low-temperature receiver is provided for system to be circulated using sweat cooling, volume and energy consumption are very big after addition sweat cooling circulation, and The invention does not circulate to sweat cooling and is equipped with low-temperature receiver, if input actual use volume meeting bigger, can not be applicable in onboard spatial It is required that.
If in addition, using closed cycle spray cooling system aboard, the change of refrigerant flow can bleed spraying The change of the series of parameters such as pressure, drop degree of supercooling, can not accurately be adjusted according to true heat gain value;Opened if being equipped with aboard Formula circulates spray cooling system, then without kind of refrigeration cycle, occupies little space, mist flow can be adjusted directly without influencing other ginsengs Number.
The cooling medium consumption of misting cooling can be calculated by formula (1)
In formula, Q is surface heat amount, kW;M is refrigerant mass fluxes, kg/s;cpFor refrigerant specific heat at constant pressure, kJ/ (kg·k);hfgFor the refrigerant latent heat of vaporization, kJ/kg;η is misting cooling efficiency;twFor heat sink surface temperature, DEG C;tinFor nozzle Saturated refrigerant temperature afterwards, DEG C, t for spraying the duration, s.
Relative to other cooling media, the latent heat of vaporization of liquefied ammonia is larger, and dosage is smaller under similar face heating amount.Such as Heating power 10kW, when heating time 1 is small, for surface temperature control at 80 DEG C, liquefied ammonia dosage is only 27.57kg, if at this time Using R134a, then dosage is 106.4kg., can be big if therefore can be using ammonia as cooling media applications in airborne spray cooling system It is big to improve system economy and continuation.The utility model uses open system, and uses the nitrogen oxides in engine exhaust Reacted with the ammonia after heat exchange, be expelled directly out out of my cabin, alleviating system heavy burden after eliminating the toxicity of ammonia.
The content of the invention
The purpose of this utility model is to provide a kind of airborne open type spray cooling system using ammonia as cooling medium.
The system is mainly by liquefied ammonia high pressure storage tank (1), flow control valve (2), the first shut-off valve (3), flowmeter (4), spray Mouth (5), surface to be cooled (6), spray chamber (7), cold recovery exchanger (8), fuel tank (9), the second shut-off valve (10), the 3rd section Only valve (11), Ammonia recovery tank (12), the 4th shut-off valve (13), engine bleed port (14), pump (15), catalyst converter (16), External environment port (17) forms.
Second shut-off valve (10) has an entrance and two outlets, and first outlet exports for ammonia storage, second outlet Exported for ammonia processing;
Pump (15) has two entrances and one outlet, and first entrance is ammonia entrance, and second entrance is engine bleed Entrance.
Wherein the outlet of liquefied ammonia high pressure storage tank (1) is connected with the entrance of flow control valve (2), and flow control valve (2) go out Mouth is connected with the entrance of the first shut-off valve (3), and the outlet of the first shut-off valve (3) is connected with the entrance of flowmeter (4), flowmeter (4) outlet is connected with the entrance of nozzle (5), on outlet spray injection to surface to be cooled (6) of nozzle (5).Nozzle (5) and Surface (6) to be cooled is enclosed in spray chamber (7).The outlet of spray chamber (7) is connected with the entrance of cold recovery exchanger (8), The outlet of cold recovery exchanger (8) is connected with the entrance of the second shut-off valve (10), the first outlet of the second shut-off valve (10) with The entrance of 3rd shut-off valve (11) is connected, and the outlet of the 3rd shut-off valve (11) is connected with the entrance of Ammonia recovery tank (12);Second The second outlet of shut-off valve (10) is connected with the entrance of the 4th shut-off valve (13), outlet and the pump (15) of the 4th shut-off valve (13) First entrance is connected.The second entrance of pump (15) is connected with the outlet of engine bleed port (14), pumps the outlet of (15) with urging The entrance for changing device (16) is connected, and the outlet of catalyst converter (16) is connected with external environment port (17).
Cold recovery exchanger (8) is arranged on around fuel tanker (9), and fuel tank (9) is cooled down.
The system mainly includes procedure below:
The quantitative high-pressure liquid ammonia of storage in liquefied ammonia high pressure storage tank (1), during system operation, opens the first shut-off valve (3), leads to Overcurrent adjustable valve (2) adjusts liquefied ammonia flow, and liquefied ammonia flow is read by flowmeter (4).Liquefied ammonia is through flow control valve (2), One shut-off valve (3) and flowmeter (4) flow nozzle (5) afterwards, injection to surface to be cooled (6), reduces after atomization in nozzle (5) The temperature of surface (6) to be cooled.Liquefied ammonia is converted to low temperature ammonia, outlet stream of the low temperature ammonia through spray chamber (7) after the completion of heat exchange Enter cold recovery exchanger (8), heat exchange, which heats up, in cold recovery exchanger (8) becomes high temperature ammonia.
When Ammonia tolerance is less, the 4th shut-off valve (13) can be closed, the 3rd shut-off valve (11) is opened, by high temperature ammonia It is stored in Ammonia recovery tank (12).After misting cooling is out of service, the second shut-off valve (10) is closed, opens the 4th shut-off valve (13)。
When systems stay run time is longer, when high temperature ammonia is more, the 3rd shut-off valve (11) can be closed, opens the 4th section Only valve (13), Ammonia gas disposal process and misting cooling process are carried out at the same time.
During high temperature nitrogen treatment, the motor exhaust of nitrogen-containing oxide is introduced by engine bleed port (14), by tail gas Flowed into high temperature ammonia by pumping (15) in catalyst converter (16), the NH in catalyst converter (16)3High-temperature catalytic reduction is carried out with NOx Reaction produces N2And H2O, the N of generation2And H2O is discharged outside cabin by external environment port (17).
Nozzle (5) and surface to be cooled (6) are enclosed in spray chamber (7) so that the low temperature ammonia flow after the completion of spraying Enter in cold recovery exchanger (8), reach saving cooling medium and energy saving effect.
The cold of recycling is used to reduce fuel tank (9) interior fuel oil temperature in the cold recovery exchanger (8), for remaining use Fuel-cooled equipment provides more sufficient cold.
Catalyst converter contains high temperature catalyst in (16), includes but not limited to TiO2、Al2O3、ZrO2And SiO2
Brief description of the drawings
Attached drawing 1 is the principle of the present invention figure.
Label title in attached drawing 1:1. liquefied ammonia high pressure storage tank, 2. flow control valves, 3. first shut-off valves, 4. flowmeters, 5. nozzle, 6. surfaces to be cooled, 7. spray chambers, 8. cold recovery exchangers, 9. fuel tanks, 10. second shut-off valves, 11. the 3rd sections Only valve, 12. Ammonia recovery tanks, 13. the 4th shut-off valves, 14. engine bleed ports, 15. pumps, 16. catalyst converters, 17. extraneous rings Border port.
Embodiment
Stored up as shown in Figure 1, a kind of airborne open type spray cooling system using ammonia as cooling medium mainly includes liquefied ammonia high pressure Tank 1, flow control valve 2, the first shut-off valve 3, flowmeter 4, nozzle 5, surface to be cooled 6, spray chamber 7, cold recovery exchanger 8th, fuel tank 9, the second shut-off valve 10, the 3rd shut-off valve 11, Ammonia recovery tank 12, the 4th shut-off valve 13, engine bleed port 14, Pump 15, catalyst converter 16, external environment port 17.
Before taking off, needed to draw spray cooling system run time cooling time according to aircraft cruising time and equipment, According to run time in liquefied ammonia high pressure storage tank 1 sufficient quantitative high-pressure liquid ammonia.First shut-off valve 3 at this time, the second shut-off valve 10th, the 3rd shut-off valve 11 and the 4th shut-off valve 13 are in closed mode.
After taking off, when needing to cool down electronic equipment or other surfaces, the first shut-off valve 3 is opened, is passed through Flow control valve 2 adjusts liquefied ammonia flow, and liquefied ammonia flow is read by flowmeter 4.Liquefied ammonia is through flow control valve 2, the first shut-off valve 3 With flow nozzle 5 after flowmeter 4, injection is to surface 6 to be cooled after atomization becomes drop in nozzle 5, with the shape of misting cooling Formula reduces the temperature on surface 6 to be cooled.Liquefied ammonia is converted to low temperature ammonia, outlet of the low temperature ammonia through spray chamber 7 after the completion of heat exchange Cold recovery exchanger 8 is flowed into, heat exchange, which heats up, in cold recovery exchanger 8 becomes high temperature ammonia.Cold recovery exchanger (8) The cold of middle recycling is used to reduce fuel oil temperature in fuel tanker, so as to need to carry using fuel-cooled airborne equipment for other For more sufficient cold.
After the completion of misting cooling, when Ammonia tolerance is less, the 4th shut-off valve 13 can be closed, opens the 3rd shut-off valve 11, high temperature ammonia is stored in Ammonia recovery tank 12.After misting cooling is out of service, the second shut-off valve 10 is closed, is opened 4th shut-off valve 13, the ammonia stored in Ammonia recovery tank 12 is mixed with the motor exhaust that engine bleed port 14 introduces Reacted into catalyst converter 16.
When systems stay run time is longer, when high temperature ammonia is more, the 3rd shut-off valve 11 can be closed, opens the 4th cut-off Valve 13, Ammonia gas disposal process and misting cooling process are carried out at the same time.
During high temperature nitrogen treatment, the engine high-temperature tail gas of nitrogen-containing oxide is introduced by engine bleed port 14, by height Warm tail gas is flowed into catalyst converter 16 with high temperature ammonia by pump 15, and multilayer reduction catalyst is equipped with catalyst converter 16. The NH in catalyst converter 163High-temperature catalytic reduction reaction, which is carried out, with NOx produces N2And H2O, the N of generation2And H2O passes through external environment end Mouth 17 is discharged outside cabins.
This is using ammonia as the airborne open type spray cooling system for cooling down medium, and wherein open system is simple in structure, dependable performance; Use ammonia as cooling medium and saved medium consumption, it is ensured that the continuation of system operation;It is anti-with ammonia using engine bleed Should, eliminate pollution of the ammonia to Inside Environment of Plane and equipment.

Claims (3)

  1. A kind of 1. airborne open type spray cooling system using ammonia as cooling medium, it is characterised in that:
    By liquefied ammonia high pressure storage tank (1), flow control valve (2), the first shut-off valve (3), flowmeter (4), nozzle (5), table to be cooled Face (6), spray chamber (7), cold recovery exchanger (8), fuel tank (9), the second shut-off valve (10), the 3rd shut-off valve (11), ammonia Recycling can (12), the 4th shut-off valve (13), engine bleed port (14), pump (15), catalyst converter (16), external environment port (17) form;
    Second shut-off valve (10) has an entrance and two outlets, and first outlet is ammonia storage outlet, and second outlet is ammonia Gas disposal exports;
    Pump (15) has two entrances and one outlet, and first entrance is ammonia entrance, and second entrance is engine bleed entrance;
    Wherein the outlet of liquefied ammonia high pressure storage tank (1) is connected with the entrance of flow control valve (2), the outlet of flow control valve (2) with The entrance of first shut-off valve (3) is connected, and the outlet of the first shut-off valve (3) is connected with the entrance of flowmeter (4), flowmeter (4) Outlet is connected with the entrance of nozzle (5), on outlet spray injection to surface to be cooled (6) of nozzle (5);Nozzle (5) and treat cold But surface (6) are enclosed in spray chamber (7);The outlet of spray chamber (7) is connected with the entrance of cold recovery exchanger (8), cold The outlet of recycling heat exchanger (8) is connected with the entrance of the second shut-off valve (10), the first outlet and the 3rd of the second shut-off valve (10) The entrance of shut-off valve (11) is connected, and the outlet of the 3rd shut-off valve (11) is connected with the entrance of Ammonia recovery tank (12);Second cut-off The second outlet of valve (10) is connected with the entrance of the 4th shut-off valve (13), the outlet of the 4th shut-off valve (13) and the first of pump (15) Entrance is connected;The second entrance of pump (15) is connected with the outlet of engine bleed port (14), pumps outlet and the catalyst converter of (15) (16) entrance is connected, and the outlet of catalyst converter (16) is connected with external environment port (17);
    Cold recovery exchanger (8) is arranged on around fuel tanker (9), and fuel tank (9) is cooled down.
  2. A kind of 2. airborne open type spray cooling system using ammonia as cooling medium according to claim 1, it is characterised in that: Nozzle (5) and surface to be cooled (6) are enclosed in spray chamber (7) so that the low temperature ammonia after the completion of spraying flows into cold and returns Receive in heat exchanger (8), reach saving cooling medium and energy saving effect.
  3. A kind of 3. airborne open type spray cooling system using ammonia as cooling medium according to claim 1, it is characterised in that: Contain high temperature catalyst in the catalyst converter (16), include but not limited to TiO2、Al2O3、ZrO2And SiO2
CN201721127279.5U 2017-09-01 2017-09-01 A kind of airborne open type spray cooling system using ammonia as cooling medium Expired - Fee Related CN207235329U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107360704A (en) * 2017-09-01 2017-11-17 南京工业大学 A kind of airborne open type spray cooling system using ammonia as cooling medium
CN112901339A (en) * 2021-01-15 2021-06-04 河北工业大学 Direct injection natural gas engine system based on ammonia pyrolysis device and control method thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107360704A (en) * 2017-09-01 2017-11-17 南京工业大学 A kind of airborne open type spray cooling system using ammonia as cooling medium
CN112901339A (en) * 2021-01-15 2021-06-04 河北工业大学 Direct injection natural gas engine system based on ammonia pyrolysis device and control method thereof
CN112901339B (en) * 2021-01-15 2022-04-26 河北工业大学 Direct injection natural gas engine system based on ammonia pyrolysis device and control method thereof

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