JPS594438A - Method and apparatus for producing inert gas or neutral gas - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing an inert, neutral gas for use in degassing, creating an inert atmosphere, drying or other operations.

BACKGROUND OF THE INVENTION Several methods are known to date for producing inert gas or neutral gas by a series of combustion, cooling, and drainage operations. Such gases are produced primarily by various types of combustion, especially emissions from boilers, power generators, and other plants, but the fumes are unstable and their precision is limited. Its composition is unknown. The chemical composition of the treated gas, such as
This results in a gas that does not have the same quality.

The purpose of the present invention is to solve the above-mentioned drawbacks, to provide a simple and
The object of the present invention is to provide a practical norocess and a device for its implementation, which can be fixed or removable, and can be moved or transported by ordinary transportation means.

Another object of the invention is to reduce the proportion of oxygen in it to a constant proportion within the range of the number P, P, M, by stoichiometric combustion of a gas with an excess of air of 0-2%. decrease,
The object of the present invention is to provide a method that enables the production of neutral gas.

Detailed description of the present invention: The present invention provides a method for producing an inert gas or neutral gas, in which the steps in F are repeated twice.

○Cracking of combustion gas, ○ Combustion of cracked mixture.

Combustion by O or mixture.

○ First cooling by diluting with a part of the gas extracted during the production of neutral gas during the manufacturing process.

○ A second cooling by passing the produced gas in contact with a heat exchanger of cooled and circulating cooling water; ○ For example, by passing the gas through a perforated plate with suction water forming a layer of water; , or by passing the gas over a heat exchanger through which circulating cooling water is passed. ○ By sprinkling water into the gas by a stream of water.

Fourth cooling, which may alternatively be by passing the gas over a heat exchanger with a cooling unit, removal of the liquid substances contained in the O gas by a separator.

The gas obtained as above, still having 100% relative humidity, in order to meet certain industrial requirements or usage standards.

○ It can be dried by dehumidifying operations by absorption or cooling; ○ It can be heated to provide the desired humidity.

These various operations require various unit devices constituting the apparatus for producing gas by the method of the present invention, and these unit devices consist of each of the means listed in F.

o Blower means (depending on the burner type chosen, this blower means may have one or two blowers with filters and silencers), burner cracking chamber, combustion chamber.

a mixing and dilution chamber for cooling the liquid, a second neutral gas-cooling water heat exchanger for cooling, a first water separator, and a third formation of at least one water layer providing cooling. A cooling column with perforated plates to allow cooling, a fourth cooling sprinkler and a linear or centrifugal separator to remove liquid material still suspended in the neutral gas. Furthermore, in order to ensure the third cooling, it is in fact combined with the heat exchanger ensuring the second cooling, and the gas is then passed through the cooling device, which may be another heat exchanger. Cooling water heat exchangers, which perform the fourth cooling through cooling, are common in various methods of cooling gas, but are adapted to the case of the present invention. From the inlet through the entire apparatus, there are valves, automatic pulp, electric pulp, flow regulators, flame, temperature and pressure regulators, regulators for regulating the analyzer, pulp and ducts, one of which is bypass, withdrawal The container is immersed in cooling water and is equipped with a starting pulp or waste pulp in case of incorrect combustion.

and a pump providing sufficient safety and a closed circuit of the secondary cooling system, as well as hot water recuperators, hot gas recuperators, cooling water generators, normal equipment with alarms necessary for the safety of the equipment. Various elements of format.

The device is equipped with a neutral gas drying and heating device for certain applications. Drying takes place by absorption and cooling, while heating takes place in a superheater. At the outlet, and in all cases, the ducts conveying the neutral gas to the storage device are equipped with extractors and water/mulch, the purpose of the latter being to prevent the gas from returning to the device. That's true.

Next, the present pronunciation will be explained in more detail with reference to the attached drawings, which show preferred embodiments.
It is not intended to limit the invention in any way. To describe a preferred embodiment, the apparatus schematically shown in FIG. The second near blower 2 enables cracking of the combustion gases in the chamber 4 of the horizontal device, and the second near blower 2
The cranking mixture is combusted in the next chamber, the combustion chamber 5, i.e. the hearth. Fuel gases are especially propane, butane, ethylene, but still propylene.
There are no other restrictions.

In the embodiment described herein, propane is selected and fed to burner 3 at a specific temperature corresponding to this fuel type. If necessary, a gas at a low temperature can be obtained by inserting the nozzle 3. By providing the filter 6 and the Silencerf in the intake lines of the blowers 1 and 2, any undesirable particles can be removed from the supply air to the best extent.

Conventional combustion can also be achieved by mixing with a single blower.

Combustion of the cracking mixture takes place in chamber 5 at a temperature of 1400°C. The gas obtained from this combustion is
Next to the chamber 5 is a mixing and diluting chamber 8 which terminates in a pipe 9 for the inlet of the neutral gas produced by the device itself. This inflow gas, controlled by the bypass 10, passes through a circulation fan 38 of the extractor, which is provided in a gas-tight device to prevent the ingress of outside air. This is for the purpose of performing a first cooling of the gas produced in chamber 5, whose temperature is 140
Lower the temperature from 00C to 9000C. The gas continues to flow along the heat exchanger 11, which provides a second cooling of the gas, still in the horizontal enclosure.
400' after passing through the heat exchanger 11, which is present in the tank 13 and has cooling water provided by a pump immersed in the tank 13, thus forming a constant closed circuit.
It becomes C. The water in the tank 13 is at a temperature of approximately 15° C. and is advantageously cooled with seawater coming from a submersible pump 36 or with an industrial water coil 14 . Two air coolers 15 also operate to cool the water in the pipes leading to the exchanger 11. A recuperator 16 is inserted into this area to utilize the heat absorbed by the cooling water circuit. By using this recuperator 16 it is possible to heat liquefied gas or even just water from any sanitary facility.

Of course, the automatic level controller 17 will automatically detect any shortage in the tank 13 [
It is connected to a recovery circuit 18 for the condensate water produced by combustion and controls a make-up valve located after the exchanger 11 at the end of the device. The level of the first separator 19 then corresponds to the removal of this condensate.

At 400'C, the neutral gas reaches a cooling column 20 comprising various components, where it traverses through at least one perforated plate 21 placed on a grid (see details in the drawing). (not shown). By arranging it in this way, the pipe 22 that sends water to the coil 14 immersed in the tank 13
The industrial water supplied from the water sprinkler 23 through the filter facilitates the formation of "blister" in the sea water. These bubbles are water and steam.

Formed from suspended gas and condensate.

The gas undergoes a third cooling through this bubble layer, followed immediately by a fourth cooling resulting from gravity watering from the sprinkler 23 mentioned above.

Instead of such sprinklers, countercurrent plates or annular plates with a large surface area can be used in a known manner.

The temperature of the neutral gas in the above region has dropped to about 3000 °C. This gas is then separated from the liquid material it contains by a linear or centrifugal separator or other separator 24. cooling column 20
At the top of the neutral gas has a temperature of 30'C and 100'
% relative humidity. The duct 25 provided above the cooling column 20 is provided with a tapping 45 through which a part of the neutral gas is withdrawn, and this part of the gas is passed through the bypass 11 and the circulation withdrawal. Vessel 3
8 and is fed into the mixing and dilution chamber 8 by via 9 as previously described. The duct 25 has various elbows and an outwardly directed opening 26, the opening 26 having two automatic pulps 28, one of which is connected to a pressure controller 30, the other of which is circulated through the duct 25. (coupled with an analyzer 27 for gases). This opening 2
6 allows the device to be started and regulated to avoid overpressure and to discharge gases whose oxygen content does not meet the requirements into the atmosphere. - the above oxygen content has been detected beforehand by an analyzer 27 located at the third point of the opening 26;

At the outlet of this opening 26, the neutral gas has a relative humidity of 100% and is passed through the extractor 29 and the emergency water check valve to the consumer or storage means.

At the bottom of the cooling column 20, a means 37 for removing industrial water or seawater sprayed by the water sprinkler 23 is provided.
The neutral gas produced in this way.

If a relative humidity of 100% is not sufficient as mentioned above, the apparatus is equipped with a dehumidifier 31 (FIG. 2) which acts either by absorption or by freezing.

- If by absorption, the desiccant may be regenerated by means of a dryer 32 associated with the drying device 31 through vias 33. On the other hand, if necessary, the neutral gas can be returned to a desired temperature, for example 400° C., by sending the neutral gas to the superheater 34. For this purpose, the superheater 34 is also connected to the dryer 32 through a pipe 33. A safety water check pulp should also be provided at the end of the exit vibrator for the consumer.

A tapping 35 is provided at the level of the combustion device to allow burning of foul-smelling and still dangerous gases whose disposal into the atmosphere is prohibited.

FIG. 1 shows automatic valve 28. Pressure controller 30° temperature range
Goki 39. Flame controller 40. Closing valve 41, adjustment cock 42. It should be noted that the arrangement consists of a minimum of control devices, such as an electric valve 43, a flow regulator ensured by any suitable device 44.

It should be noted that in the variant of the device shown diagrammatically in FIG. 3, the cracking, combustion of the cracked mixture, first and second cooling operations also take place there. However, the third cooling takes place immediately after the second cooling in conjunction with the third cooling device.

It is thermally cooled by flowing the gas along a heat exchanger 46 having constantly circulating cooling water before being cooled by flowing the gas along a heat exchanger having a cooling device 47. This is because it is related to limiting.

The temperature of the gas at the end of this circuit is approximately 20°C.

The temperature has actually dropped to ambient.

- In the particular case mentioned above, when the gas leaves the cone of the boiler, it immediately goes into the duct 25. The duct 25 is
Like the duct shown in FIG. 1, it has a tapping 45 which serves as the starting point for the pipe 9 which is associated with the bypass 10 and the blower extractor 38 provided in the sealing device. This pipe is dilution chamber 8.
The circulation of the produced gas is ensured by entering the boiler at the level of . This is for the purpose of performing the first cooling as described above. Tapping 45 and its downstream,
It is the exact same equipment and operation as shown and described in FIGS. 1 and 2.

The neutral or inert gas produced as described above is used for degassing, forming an inert atmosphere, or drying as described below.

(a) A neutral gas at 20°C and 100% relative humidity.

In the petroleum industry, it is used for methane transport, for storing chemical products in tank trucks, tank cars, all equipment used for the transport of gaseous, dangerous or unpleasant odor materials.

(b) Neutral gases with a relative humidity change of 10% at 2o°C have the same uses as above, but for perishable materials and materials that deteriorate with moisture.

It is also used for grains and fruits.

(c) The hot neutral gas with a relative humidity change of 10% is
K is also used in the overdrying of the mentioned materials, and even in woodworking.

Illusion occurs when the generated gas passes through the cooling column 2o.

Certain substances, for example carbon dioxide, are so purified by dissolving them in water that by the time they reach the mouth of the means of use 29, the gas is almost identical to nitrogen and has a sufficient degree of It has a purity and therefore meets specific criteria for use.

The method of the invention can also be used in other fields, for example, when gas is used to recover heat by heat exchange and its temperature is substantially lowered by dilution, it can be used for household purposes. It is still possible to construct a boiler for heating water for industrial use.

It will be obvious that various modifications can be made to the embodiments described above by substituting equivalent technical means without departing from the scope of the invention.

[Brief explanation of the drawing]

FIG. 1 schematically shows an embodiment of the device according to the invention. FIG. 2 schematically shows an apparatus similar to that shown in FIG. 1, but comprising a dehumidifying device for the generated neutral gas and a heat exchanger. FIG. 3 diagrammatically shows a modification of the above embodiment in which the third and fourth cooling is not carried out in specific columns. 1...First blower, 2...Second blower, 3...Burner, 4...-
Mountain/cranking chamber, 5... Combustion chamber, 8
・-Mixing dilution chamber, 11... ・Heat exchanger, 13...
Tank, 14... Coil, I6...
Recuperator, 20... Cooling column, 21゛... Perforated plate, 23...-- Water sprinkler, 24 Duct, 32... Dryer, 34・・・・・・
Superheater, 35.45 ・ Tapping, 46...
・・・・・・・・・−・Heat exchange tester, 47・・Cooling device. Patent applicant: Nciete BBM Niss.A. Patent attorney: Souo Suga

Claims (9)

[Claims] (1) Cracking of the combustion gases, combustion by burning or mixing of the cracking mixture, dilution and/or heat exchange and/or cooling several times by bubbling and/or water sprinkling9 drainage by separation, drying and reheating or drying A method for producing an inert gas or neutral gas by stoichiometric combustion, the first cooling being carried out by introducing the neutral gas obtained by this production method, The second cooling is carried out by passing the gas over a heat exchanger, which is a closed cooling water circuit, and the third cooling is carried out by passing the gas through a layer of water or a layer of water bubbles consisting of at least one perforated plate. a fourth submergence by spraying the gas using a stream of industrial water or seawater, and drainage of the neutral gas by linear or centrifugal separation of the droplets. . (2) The third cooling is performed by passing gas through a heat exchanger having constantly circulating cooling water, and the fourth cooling is performed by passing gas through a heat exchanger having a cooling device. , or the method according to claim 1 (4), wherein the cooling water is passed through another heat exchanger again. (3) The method according to claim 1 or 2, in which the temperature of the gas is corrected by passing it through a superheater. (4) An apparatus for treating and producing inert gas by the method set forth in claim 1, 2, or 3, comprising two blowers, a burner, and a cracking chamber. , combustion chamber or hearth, dilution chamber, heat exchanger,
It consists of a cooling column, a duct for conveying gas to the equipment used, a drying device and a superheater, and the dilution chamber is connected to the end of the boiler in the duct by a tap provided at the outlet of the cooling column or by a pipe with an extractor and a bypass. A device connected to the provided tapping. (5) An apparatus for processing and producing neutral gas according to claim 1, 2, or 3. A blower with two fans and one burner,
The cranking chamber and combustion chamber are still the hearth. Dilution chamber, heat exchanger, second and third heat exchangers respectively, ducts for conveying gas to the equipment used. The above heat exchanger, consisting of a dryer and a superheater, is in communication with a cooling water storage tank having a coil of industrial water or sea water, which is supplied by an immersion pump, and during the evening the pump immersed in the above A device installed in the circuit that supplies cooling water to the heat exchanger and where the air cooler returns cooling water to the tank. (6) The cooling column consists of a grid consisting of at least one perforated plate and a set of sprinklers connected by pipes to a coil immersed in the tank, and a linear or centrifugal separation. Claim 4 consisting of a container
Apparatus according to paragraph or paragraph 5. (7) The apparatus according to claim 4 or 5, wherein an air vent is tapped into the duct, an analyzer is installed at the bottom of the duct, and an automatic pulp is installed at the downstream side of the duct. (8) The device according to claim 4 or 5, wherein a recuperator is provided in the return circuit of the cooling water coming out of the heat exchanger. (9) A device according to claim 4 or 5, in which a cooling water condenser is provided at the end of the produced gas circuit, in the F stream at the outlet from the boiler. a ■ The absorption dryer is regenerated by a dryer tapped before the inlet where the gas enters the cooling column. Claim 4, dimension 5, which is connected to the boiler between the heat exchangers through a pipe or is tapped.
Section equipment.