JPH07310700A - Combination jet vacuum generating device - Google Patents

Abstract

PURPOSE:To directly discharge gas such as steam and air under vacuum into the atmospheric pressure by blowing a jet water stream, in which cooling water is pressurized and jetted, into a supersonic mixed gas flow to exchange energy with the mixed gas flow. CONSTITUTION:Pressurized and jetted cooling water D is blown into a supersonic mixed gas flow E of extraction gas C with operation steam A to exchange energy with the mixed gas flow E. This supersonic gas flow E brings about abrupt volume decrease because of a shock effect due to condensation and speed decrease and serves to reduce a load to the operation steam A, Because of a back pressure damping effect of the mixed gas flow E at the time point of passing through a diffuser throat 4, decrease in suction operation, namely decrease in operation steam quantity and decrease in operation steam pressure, can be attained. Energy exchange under supersonic speed facilitates bubble dispersion and mixing of non-condensing gas into a water current, and discharge of the gas into the atmospheric pressure is conducted by utilizing velocity energy of two-phase fluid of uniform quality gas liquid. Further, waste steam of 100 deg.C or lower can be utilized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The air purifying device according to the present invention has an air purifying operation range from 2 m / mHg to 60 m / mHg before and after the air, and a suction gas is operated under supersonic speed. It has a bleeding capacity of about 1000 kg per hour,
Including the case where the extracted gas is steam, it can be directly released to atmospheric pressure and can be used for steam of 100 ° C or less. Therefore, it is possible to use vacuum metallurgy, vacuum drying, distillation, deaeration, extraction, separation, Since it is possible to use steam at temperatures below 100 ° C, not to mention large-scale extraction fields, it has a wide range of industrial applications, including small-scale industrial fields that do not have boiler equipment.

[0002]

2. Description of the Related Art The mainstream of postwar wartime air generators is mass extraction,
Most of the equipment was occupied by the steam ejector up to low air volume and small capacity extraction, as well as high air volume, but the oil shock gradually replaced the air pump with a mechanical rotary body. Therefore, the steam ejector is still used for the high-capacity large-capacity bleed air, but for most of the other parts, the rotary-body vacuum pump is used. Although a mechanical air pump cannot be expected to have a large extraction capacity, it can be used without problems for extraction air that contains little steam such as air, but the extraction air for gas containing steam generates water droplets due to the compression action and rotates. As the body temperature rises, the vapor pressure inside the pump becomes high, and it is impossible to bleed the air completely.As a countermeasure against this, a cold trap is installed in front of the air pump, and it is completely However, the demand for direct steam emission is extremely high due to the complexity of the equipment, the increase in the amount of electric power used, and the increase in the daily handling work for maintenance work.

[0003]

The suction operation for discharging the gas in the air is the handling of an extremely dilute gas body having a volume several hundred times the volume of the gas under atmospheric pressure, which is an effort after all. However, since it is an approach with volume, a vacuum pump based on a rotating body that is often used from this aspect is not suitable for inhaling a dilute gas body having a large volume, and this point The working suction method based on sonic vapor flow has a large effect on acceleration due to the large specific volume.
A suction method that relies on a steam ejector would be optimal. However, the problem with the compression of the ejector is that the performance is extremely poor, and the problem that can be solved is whether the method of compressing the mixed gas under supersonic speed with the steam after sucking the extracted gas should be a method with a good operating effect. Is.

[0004]

[Means for solving the problem]

[Measures to improve the compression ratio of the steam ejector] Although a supersonic vapor flow can be obtained due to the adiabatic head of the vapor ejector,
A large amount of mist is generated, and steam with a pressure of 7 kg / cm ² up to 10 m / mHg is subjected to adiabatic expansion.
300m / sec, the amount of mist is 25% before and after the amount of vapor used, and there are many problems with adiabatic compression in this gas-liquid multiphase flow. Therefore, water removal from the system before the compression process or the diffuser inlet Although various data were obtained based on experiments and analysis by devising measures to increase the compression ratio, such as evaporation of mist in Japan, the results obtained by spending about 10 years were extremely small. As a result, the adiabatic compression method based on the diffuser diffuser was abandoned. The recovery of pressure had to be abandoned as a result of the increase in steam consumption due to the increase in the load on the working steam.

[Compression effect by combination jet] The mixed flow of supersonic vapor gas that passes through the diffuser throat makes contact with water and makes impact contact, and the volume of the mixture rapidly increases due to conversion of heat energy into water. It depends on the reduction effect. It was possible to measure the reduction of the load work, which is different from the adiabatic compression to the working vapor, by causing the suction action into the condensation chamber. That is, a jet water flow obtained by pressurizing the cooling water is blown into the supersonic mixed air flow to transfer energy with the mixed gas flow. A gas-mixed vapor flow having a velocity several tens of times the velocity of the jet water flow makes a violent rear-end impact contact with the jet flow that is flowing down to make the temperature rise together with the decompression compression action, but it depends on the water flow. Condensable gases such as steam in the mixed gas are condensed by cooling due to the effect of suppressing the temperature, and condense with the water flow to increase the temperature and increase the velocity energy.
The non-condensable gas in the mixed gas flow also recovers its pressure by decelerating under temperature control and recovers the pressure up to the vapor pressure of water, and plays the role of primary compression. The compression and mixing effect of the literally vigorous flowing water causes the uniform air bubbles to be dispersed and mixed into the water flow, and finally the recovery of the pressure due to the utilization of the velocity energy of the homogeneous gas-liquid two-layer mixed water flow. Measured and released under atmospheric pressure to complete secondary compression.
Due to the rapid reduction in the volume of the mixed gas under gas-liquid co-traveling immediately after the contact of the gas and liquid, the working vapor plays a role in the large damping effect of the back pressure of the mixed gas flow when passing through the diffuser. The amount of working steam used is greatly reduced because the work amount is greatly reduced, and further, it is possible to use steam at a pressure below atmospheric pressure that could not be achieved by the conventional steam ejector, that is, at a temperature below 100 ° C. It was possible to generate a true sky. As an example, when 0.7 kg / cm ² of steam, that is, saturated steam at a temperature of 90 ° C. is subjected to adiabatic expansion up to 10 m / mHg, the adiabatic head is about 130 kcal / kg, the flow velocity is 1050 m / sec, and the moat rate is 18%. The operating efficiency of steam is higher than that of steam, and the effect on energy saving is extremely large.

[0005]

FUNCTION-1 This device is a device shown in FIG. 1 and shows a combination jet which is operated downstream of a vertical device. The working steam is supplied from the top center A and is sucked into the "1" suction chamber through the "2" steam nozzle. The extracted gas is supplied from C to the suction chamber and is accelerated by the working vapor flow.
It is mixed with the working steam flow, passes through the tapered diffuser of "3", passes through the diffuser throat, and slightly increases the supersonic velocity, and is blown down from the central portion of the top of the condensation chamber of "6". A plurality of "5" jet water nozzles are set around the mixed gas inlet on the ceiling of the condensing chamber, and the pressurized cooling water supplied to the D section is introduced from the top of the periphery of the gas flow to the center of the lower part of the chamber. It is blown down as shown by the F-jet water flow. The supersonic mixed gas flow E makes impact contact with the jet cooling water at a speed several tens of times faster than the injected jet water flow, giving the energy of the mixed gas flow to the jet water flow and increasing the temperature of the water flow. And increase the speed. The mixed gas E is condensed by the contact with the jet jet water flow and is drawn into the condensation chamber due to the rapid back pressure damping effect due to the velocity reduction. Due to this load reduction effect, the conventional vapor ejector can be obtained. The amount of working vapor of A, which is not present, was measured, and further, it was possible to perform a vacuum generation operation by using waste vapor having a working vapor pressure of atmospheric pressure or less. The condensing chamber of “6” has a tapered shape, and the non-condensable gas in the mixed gas reaches the lower part of the chamber in a form preceding the water flow, and completes the preparation for the secondary compression. That is, the closer to the lower end of the chamber, the smaller the flow passage area is, and the impact of jet water from the upper part reduces the flow of water into a homogeneous flow of bubbles, which is discharged together with the discharged water to the outside of the system.
Jet water is discharged like H through the downcomer discharged under atmospheric pressure due to the velocity energy when passing through the mouth ring. After being cooled by the cooling tower, it is cooled by the cooling tower and then discharged through the compression pump. It is led to the cooling water inlet and used for circulation.

[0008]

[Operation-2] "FIG. 2" is a view showing a main part of the combination jet having a mechanism for adjusting the diffuser throat area. The "10" baffle block has a conical shape as shown in the figure, and is housed in the "4" diffuser throat and the upper part of the condensation chamber and has the function of vertically moving between them. As shown in the figure, the area of the diffuser throat shows the maximum value when it is located at the upper part of the lower condensation chamber. The diffuser flow path area shows the minimum value. By adjusting the passage area of the diffuser, the flow velocity of the E mixed gas changes, and the range of operating conditions that can respond to changes in compression work due to changes in vacancy, extraction amount, and seasonal water temperature is expanded. Equipment for the purpose of expanding the operating range together with adjusting the amount of working steam, etc. A combination jet air blower with a diffuser throat area adjustment function.

[0007]

[Examples] With this machine, several units including a production device and an experimental device were carried out, and four examples including the devices currently in production operation are described in the table below.

[0008]

EFFECTS OF THE INVENTION The present invention is equipment equipped with the features described above, and is described in the following 5 items. It enabled the use of low-pressure steam and was able to operate at a steam pressure of 10 m / mHg of 0.9 kg / m ² . By reducing the amount of working steam, it has become possible to deal with twice the amount of 10m / mHg steam specific extraction. Mass extraction results Energy saving extraction has been realized. 30m / in the sky with a steam amount ratio of 1
mHg. The bleeding record was 0.5 m / mHg of high air. But before and after the steam ratio 20. Prototype test results for a two-stage combination jet We obtained a track record of 1 m / mHg with a working steam ratio of 5, and there is ample possibility of supporting the high sky field. Maintenance-free equipment that has a simple equipment structure and does not have a constant motion mechanism, and is a simplified device that does not require consideration for aging due to the cleaning effect of steam and water washing. It is a device that has the potential for a low sky region exceeding 0.1 m / m.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a combination jet of the present invention and a vacuum generating device.

FIG. 2 is a cross-sectional view of the essential parts of a combination jet air-conditioning generator having a diffuser throat area adjusting mechanism of the present invention.

[Explanation of symbols] 1. Inhalation chamber 2. Steam nozzle 3. Tapered diffuser 4. Diffuser throat 5. Jet water nozzle 6. Condensation chamber 7. Jet water mouth ring 8. Downcomer 9. Water tank 10. Baffle block A. Working steam B. Jet jet steam C. Extraction gas D. Cooling water E. Mixed gas flow F. Jet water flow G. Discharged water flow H. Drainage

[Procedure amendment]

[Submission date] September 27, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Title of invention

[Correction method] Change

[Correction content]

[Title of Invention] Combination jet air-conditioning generator

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction content]

[0001]

BACKGROUND OF THE INVENTION The air purifying device according to the present invention has an air purifying operation range from 2 m / mHg to 60 m / mHg before and after the air, and a suction gas is operated under supersonic speed. It has a bleeding capacity of about 1000 kg per hour,
Including the case where the extracted gas is steam, it can be directly discharged to atmospheric pressure and can be used for steam less than 100 ° C, so it is possible to use vacuum metallurgy, vacuum drying, distillation, deodorization, extraction, separation, etc. This is a facility that has a wide range of industrial applications, including small-scale industrial fields that do not have boiler equipment, because it is possible to use steam at temperatures below 100 ° C, not to mention large-scale extraction fields.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

[0007]

[Examples] With this machine, several units including a production device and an experimental device were carried out, and four examples including the devices currently in production operation are described in the table below.

Claims (2)

[Claims] 1. A steam is blown into a suction chamber under a fresh air to form a mixed flow of supersonic extraction gas and steam. Cooling water of a pressure jet is blown into this mixed gas flow to exchange energy with the mixed flow. The supersonic gas flow serves to reduce the load on the working steam by condensing a sudden volume decrease due to the impact effect of condensation and velocity decrease. Due to the back pressure damping effect of the mixed gas flow at the time of passing through the diffuser throat, it is possible to reduce the suction operation, that is, the amount of working steam and the working steam pressure, and to reduce the temperature below 100 ° C below atmospheric pressure. It also enabled the operation by the steam showing. Furthermore, energy transfer under supersonic speed facilitates bubble dispersion and mixing in the water flow of non-condensed gas, and discharges under atmospheric pressure by utilizing the velocity energy of a two-phase fluid of a homogeneous gas liquid. The invention of a vacuum generator that uses a "combination jet" of steam and cooling water that enables secondary compression. 2. A "baffle block" having a shape similar to that of a conical or a waffle which can move up and down in the throat part of the tapered diffuser and the condensation chamber is stored, and the vertical position of this block in the axial direction is stored. Double-cylinder shaped by the movement of the diffuser throat and the inner cylinder. The area of the flow passage is increased or decreased to change the velocity of the mixed gas supersonic flow passing through this area. The invention of the "combination jet" air space generation device with the diffuser throat area adjustment mechanism for the purpose of expanding the air space and the adaptability to the amount of extracted gas.