CN1228587C

CN1228587C - Mixed liquid CO2 cold wind generator

Info

Publication number: CN1228587C
Application number: CN 01133718
Authority: CN
Inventors: 童明伟; 张昌义
Original assignee: Chongqing University
Current assignee: Chongqing University
Priority date: 2001-12-19
Filing date: 2001-12-19
Publication date: 2005-11-23
Anticipated expiration: 2021-12-19
Also published as: CN1370958A

Abstract

The present invention relates to a mixed liquid CO2 cold gas generator. A vortex dehumidifier is arranged on the device, and is composed of a dehumidification casing and a mixed gas dry wind exhaust funnel which is arranged in the casing. A circulation current channel is formed between the dehumidification casing and the mixed gas dry wind exhaust funnel, room temperature mixed gas speeds up at a gas supply nozzle of the dehumidifier of the annular channel and flows inside tangentially, and in addition, an atomization spray nozzle of liquid CO2 is arranged on the position of 180 degrees on the opposite of the channel. The liquid CO2 which is throttled and decompressed can be atomized by high-speed mixed gas flow at a CO2 jetting guide opening of the terminal of a gas supply nozzle of a cold gas pot.

Description

Mixed liquid CO 2Cold wind generator

Technical field:

The title of patent of the present invention is: mixed liquid CO ₂Cold wind generator belongs to refrigeration and cryogenic technique field.

Background technology:

In the metal cutting process technology, use low-temperature cold wind to replace the technical profession of cutting agent processing to jump up at present, this technology adopts about-30 ℃ low-temperature cold wind to remove to cool off cutting point, has played good effect.In this technology, a kind of method is to use low boiling working fluid to reduce air themperature as low-temperature receiver, at present, mainly is to use liquid nitrogen.Because liquid nitrogen temperature under normal pressure is-196 ℃, air and liquid nitrogen carry out heat exchange in recuperative heat exchanger, and structure is very complicated, and the cost of liquid nitrogen is also higher, produce-30 ℃ air, are inappropriate economically with-196 ℃ liquid nitrogen.

Summary of the invention:

The present invention provides a kind of mixed liquid CO in order to remedy above-mentioned metal cutting processing with the technical deficiency of cold wind generator ₂Cold wind generator is by liquid CO ₂Storage tank, cyclone dehumidifier, cold wind jar, dehumidifier nozzle of air supply, cold wind canister incoming gas nozzle, flow control valve, choke valve and corresponding liquid CO ₂Connecting tube, gas connecting tube are formed, and it is characterized in that: compressed air cooling cooling is by liquid CO ₂After the choke valve throttling, be vaporific spraying into and form mist in the air-flow, fog-like liquid CO ₂Constantly gasification absorbs heat in mist.The cyclone dehumidifier that uses is by dehumidifier shell and concentric with it and place the cyclone dehumidifier dry wind aiutage in the shell to form, form annular channel between the two, mixed at room temperature gas quickens the tangential inflow in back from the dehumidifier nozzle of air supply of circular passage, and liquid CO is housed in passage ₂Atomizer, CO ₂The emission direction of liquid mist is identical with the mixed airflow rotation direction.Isolated water droplet accumulates in the dehumidifier bottom.The characteristics of cold wind canister incoming gas nozzle are: the end of negative throat noz(zle) has a liquid CO ₂Ejecting port is through the liquid CO of choke valve expenditure and pressure ₂Drain by the high-speed mixing aerodynamic atomization and from the end outlet of this nozzle immediately after entering ejecting port.

Description of drawings:

Fig. 1 is mixed liquid CO ₂System construction drawing.

Fig. 2 is the cyclone dehumidifier cutaway view.

Fig. 3 is liquid CO ₂The injector structure chart.

Wherein: the liquid CO of 1- ₂Storage tank; The 2-heat-insulation layer; The liquid CO of 3- ₂Feed pipe; The 4-flow control valve; The 5-throttle expansion valve; The 6-drainpipe; 7-cold wind jar; 8-cold wind air supply pipe; 9-low-temperature mixed tracheae; 10-cyclone dehumidifier dry wind aiutage; 11-mixed at room temperature flue; 12-cold wind canister incoming gas nozzle; 13-dehumidifier nozzle of air supply; The 14-cyclone dehumidifier; 15-negative throat noz(zle) interface; The liquid CO of 16- ₂Mist pipe; 17-CO ₂Balance pipe; 18-CO ₂The storage safety valve; The 19-gully.

The specific embodiment:

Fig. 1 represents that also a per minute is for 2M ³Temperature is-30 ℃ mixed liquid CO ₂The cold wind generator structure chart.At liquid CO ₂The liquid CO of storage in the storage tank 1 ₂Absorb the heat rear section gasification of passing heat-insulation layer 2 and be CO ₂Gas and from the top CO of storage tank 1 ₂After the compressed air of balance pipe 17 and air compression station supply mixes in the mixed flue 11 of room temperature, the dehumidifier nozzle of air supply 13 of flowing through quickens, and tangentially flows in the cyclone dehumidifier 14 at a high speed, on cyclone dehumidifier 14, also has a branch pipe(tube), through throttle expansion valve 5 and flow control valve 4 and liquid CO ₂Feed pipe is connected, the liquid CO of cryogenic high pressure ₂Spray into the body clearance of cyclone dehumidifier 14, liquid CO through this branch pipe(tube) at a high speed in vaporific mode ₂Gasification descends the mixed airflow temperature rapidly, steam in the mixed airflow just condenses into drop, around cyclone dehumidifier dry wind blast pipe 10 rotation at a high speed, the water droplet in the air-flow is separated and conrotatory wind dehumidifier 14 inwalls flow down, and accumulates in the gully 19 of bottom with air-flow.Dry wind is discharged in cyclone dehumidifier dry wind aiutage 10, is guided to cold wind canister incoming gas nozzle 12 by low-temperature mixed tracheae 9, in the bottom of cold wind canister incoming gas nozzle 12 a liquid CO is arranged ₂Atomizing 16, liquid CO ₂From liquid CO ₂Feed pipe 3 is behind flow control valve 4, throttle expansion valve 5, mix with dry air in the cold wind canister incoming gas nozzle 12 and temperature is further reduced, enter in the cold wind jar 7 and store, its outside has heat-insulation layer 2 to prevent that cold scatters and disappears, and is provided with cold wind air supply pipe 8 and drainpipe 6 above cold wind jar 7.

Shown in the figure, at the liquid CO of the steel of φ 400 high 800mm ₂The outside of storage tank 1 is wrapped in the thick polyamine fat vacuole foam heat-insulation layer 2 of 50mm, can preserve liquid CO ₂150kg, CO ₂Storage safety valve 18 controls jar interior CO ₂State is: temperature-20 ℃, and pressure is 2.0MPa, top also has a CO ₂Balance pipe 17 imports jar internal cause heat into and the CO that gasifies ₂Being discharged into pressure is 0.5MPa, temperature is in 30 ℃ the compressed air hose, two strands of gases mix the back temperature and can descend to some extent, mist by mixed at room temperature flue 11 in dehumidifier nozzle of air supply 13 tangentially sprays into slit between cyclone dehumidifier 14 urceolus and the cyclone dehumidifier dry wind aiutage 10 at a high speed, at the opposite side of slit, liquid CO ₂Through liquid CO ₂Be vaporific high speed behind feed pipe 3, flow control valve 4, the throttle expansion valve 5 and spray into, low temperature CO ₂Liquid mist and mixed at room temperature air-flow further mix, gas flow temperature is dropped to about 2 ℃, the oversaturated steam water droplet that just congeals into, be separated, converge in along cyclone dehumidifier 14 inwalls in the gully 19 of its underpart, 2 ℃ mist is discharged to the low-temperature mixed tracheae 9 from blast pipe, and quickens through cold wind canister incoming gas nozzle 12.Simultaneously, from liquid CO ₂One CO of injection in the pipe ₂Liquid mixes at cold wind canister incoming gas nozzle 12 and low-temperature mixed gas once more with vaporific behind flow control valve, and gas flow temperature further drops to about-30 ℃, is stored in then in the cold wind jar 7.Cold wind jar diameter is 1000mm, and high 1500mm can preserve 0.25MPa ,-30 ℃ mist 3.7m ³

Claims

1, a kind of mixed liquid CO ₂Cold wind generator is by liquid CO ₂Storage tank, cyclone dehumidifier, cold wind jar, dehumidifier nozzle of air supply, cold wind canister incoming gas nozzle, flow control valve, choke valve and corresponding liquid CO ₂Connecting tube, gas connecting tube are formed, and it is characterized in that: liquid CO ₂After throttling, be vaporific spraying in the compressed air stream and form low-temperature mixed gas.

2, mixed liquid CO as claimed in claim 1 ₂Cold wind generator, it is characterized in that: cyclone dehumidifier by the dehumidifier shell and with it with one heart and place the gaseous mixture dry wind aiutage in the shell to form, form annular channel between the two, mixed at room temperature gas tangentially flows into from the dehumidifier nozzle of air supply of annular channel, and liquid CO is housed on annular channel ₂Atomizer, CO ₂The emission direction of liquid mist is identical with the rotation direction of mixed at room temperature air-flow, and isolated water droplet accumulates in the bottom of dehumidifier.

3, mixed liquid CO as claimed in claim 1 ₂Cold wind generator is characterized in that: on the low-temperature mixed feed channel before the cold wind canister incoming gas nozzle liquid CO is housed ₂Ejecting port is through the liquid CO of expenditure and pressure ₂Enter behind the ejecting port immediately by from the swiftly flowing low-temperature mixed aerosolization of low-temperature mixed tracheae, and enter the cold wind jar from this nozzle end outlet.