TH12745B - Cryogenic air separation processes and machines - Google Patents

Abstract

Cryogenic air separation processes and methods by air cooling and after compression and purification The distillation is then purified in the purification column to form a liquid containing a large amount of oxygen. liquid with argon-oxygen gas stream Contained in the nitrogenous gas is separated to form a stream of oxygen and argon, causing the argon gas to condense to supply the distillation flow back to the argon gas column. The oxygen-rich liquid stream is exposed to expand to a pressure at which the oxygen-rich liquid reaches a temperature below the condensation temperature of argon gas and subsequently vaporizes. The condensation of argon gas then clears the liquid. with a large amount of oxygen that turns into a vapor It enters the nitrogen depleting column and the nitrogen is removed by degassing gas to form an argon-oxygen gas liquid. which will be introduced into the argon gas column The nitrogen removal column is regulated to operate at the specified pressure range. Therefore, the level of the inlet through which oxygen enters the nitrogen removal column is the non-pressurized level of the oxygen-rich liquid after expansion displaces argon gas from the top of the gas column. argon as a product Processes and finishers can be operated to produce high-purity argon-gas liquefied vapors in trogen and oxygen using different trays and/or assembled bundles. Mass transfer parts which are in contact with the liquid in the column. In addition, products of high purity oxygen and nitrogen can be produced as well with this prefabricated machine process.

Claims (9)

1. The cryogenic air separation process to produce high purity argon gas consists of: compression and air purification; Post-compression cooling and air purification to a suitable temperature for purifying the air; Purify the air inside the distillation column. So that it forms the bottom of the oxygen-filled liquid column. And on the top of the tower there was a greater amount of nitrogen within the distillation column; To separate the liquid containing Argon - oxygen Contained in nitrogen within the argon column to form the bottom of the liquid oxygen column. And on top of the tower was a high purity argon vapor; Move the flow The argon consists of the top of the tower that is vapor. The high-purity argon exits the argon column, condenses the argon stream by indirect heat exchanger, and induces the argon stream, after condensing, back into the argon column. In a brief flux pattern; Transfer the oxygen-filled stream that comprises the bottom part of the oxygen-filled liquid column out of the purification column, expands the oxygen-filled stream to the pressure where the oxygen-rich liquid is present. The temperature does not exceed the condensation temperature of the top of the vapor chamber. High purity argon, causing at least some of the oxygen-filled currents to vaporize against the condensation. Argon undergoes an indirect heat exchange, and then induces a stream filled with oxygen, after at least partial vaporization, into the nitrogen removal column at the concentrated inlet level. That are compatible with the oxygen-filled current concentration; Eliminate the nitrogen from the oxygen-rich stream induced into the nitrogen removal column with the elimination gas. So that the argon-oxygen-containing liquid concentrated in the nitrogen forms the bottom of the argon-oxygen gas liquid column; Move the flow Argon - oxygen That consists of the bottom part of the liquid column that is Argon - oxygen From the column, remove the nitrogen and induce it into the R-Gon gas column to separate the liquid containing Oxygen argon And to make the liquid part Argon - oxygen To vaporize, to produce eliminating gas; Move the gas removed from the column. Argon and induced into the column eliminating nitrogens; The nitrogen removal column is controlled to operate at a predetermined pressure range by controlling the purge gas pressure on the inlet to the nitrogen removal column so that the level of the The oxygen-filled current has a pressure level not exceeding the pressure of the oxygen-filled current after expanding to allow the oxygen-filled current to flow into the nitrogen-eliminating column, and the argon column is performed. In which the pressure range is higher than the rated pressure range of the resulting pressure difference; Making argon-oxygen currents Flows into the argon column by raising the upper part; And move the product stream out of the column Argon that consists of the top of the tower is argon steam. 2. Process of claim No. 1, where at the top of the tower containing a large number of nitrogens of the purification column is condensed against the becoming of the bottom of the filled liquid oxygen column. In the argon column to form liquid nitrogen, some of the liquid nitrogen reverts back to the distillation column as liquid nitrogen reflux. And make it form in the reflux stream Which has been induced into the Nitrogen removal column as reflux 3. The process of claim 1, where: the product nitrogen stream and the waste nitrogen stream are removed from the nitriding column; The resulting oxygen stream is taken away from the argon column; The reflux stream, consisting of a tower top filled with nitrogen, is displaced from the distillation column. And was washed into the nitinogen removal column as reflux containing nitric acid; The reflux and oxygen-filled currents are dimmed through indirect heat exchange with the product Nitrogen current and the waste Nitrogen current. In which the result will be partially warmed; And the product oxygen and the producted and wasted nitrogen stream Has been heated Rise completely after indirect heat exchange with reflux currents And a stream full of oxygen 4. Process of claim No. 1, where air is cooled as well as the air stream and maintains the process in thermal equilibrium by diverting the auxiliary air stream from the air stream, after cooling the air. Partially down, it expands the air at work capacity and induces all or part of the air stream into the nitriding column. 5. Refrigerated air separation unit consists of: Compression equipment for compressed air; Purification equipment connected with a compression device to purify the air; A cooling device connected to a purification device to cool the air to a suitable temperature for the purification; And one distillation column system which has, one purification column connected with another cooling device and has a framework to purify the air. So that it forms the bottom of the oxygen-filled liquid column. And on top of that vapor tower, there was a greater amount of nitric within it; One agon column structured to separate argon-oxygenated liquids. The concentrated nitrogen enters the bottom of the liquid oxygen column and the top of the vapor tower. High Purity Argorn; The expansion valve is connected to the purification column and is structured to radiate the oxygen-filled stream that comprise the lower part of the oxygen-rich liquid column to the pressure at which the current is filled. With oxygen there is a drop in temperature not exceeding the condensation temperature of the top of the tower as high purity argon vapor; One upper condenser connected to an expansive argon valve column, giving the upper regulator a layout to condense current. The argon consists of the top of the tower that is vapor. High-purity argon is indirectly exchanged with an oxygen-filled current, in this way at least partially vaporizing the oxygen-filled stream. And causes the argon stream, after controlling it, returns to the argon column as in reflux form. One Nitrogen eliminating column that makes the contour to remove the nitrogen from the oxygen-filled stream with the eliminating gas. In order to form an argon-oxygenated liquid Contained in the mix, nitrogen is the most visible part of the column within it; The column eliminates the nitrogen attached to the upper condenser. So that the main oxygen-filled currents from at least partially vaporize It flows into the nitrogens removal column at the entrance level with a concentration compatible with the oxygen-filled stream; A device for connecting the nitrogen removal column to the column. Argon, so that the argon-oxygen stream contains the argon-oxygen liquid Contained will flow into the argon column. And partially vaporized to form eliminating gas; The argon column connected to the nitrogen removal column. So that the purge gas flows from the argon column into the nitrogen removal column; The pressure reducing valve is between the argon column and the nitrogen removal column, to control the operational quenching range of the nitrogen removal column. So that the pressure level of the oxygen-filled current does not exceed the pressure of the oxygen-filled current after expansion. To allow full flow With oxygen flowing into the nitrogen removal column and the argon column is operating at a higher pressure range than the pressure range of the nitrogen removal column. So that the gas eliminates the nitrogen under the thrust of the pressure difference that occurs between the two pressures; And the equipment connected to the column Argon to form a stream of vapor-containing products on top of a high purity argon tower. 6. The successor of claim 5, where: a device that connects the nitrogens to the argon column consists of a pipe for conduction of argon-oxygen streams. Out of the column, eliminate the nitrogen into the argon column, and the support for the column eliminates the nitrogen sufficiently higher compared to the argon column. Therefore argon-oxygen currents There will be a sufficient upper part to flow into the argon column. 7. Success of claim 5 or claim No. 6, where: Purification column from column. Argon is connected in a heat-transfer relationship with the condenser's re-boiler. To make the top of the tower containing a large number of nitrogens, the purification column condenses against the vaporization of the bottom of the liquid oxygen column contained in the argon column to form liquid nitrogen. ; And the finisher also consists of a pipe which connects the condenser's re-boiler to the nitrogen removal column. So that the liquid nitrogen stream is induced into the nitrogen removal column to form a reflux. 8. Enclosure of Claim 7, where the finisher also contains a sub-cooling device connected to the nitrogen column. And connected to the distillation column to make the product nitrogen stream And the waste nitrogen stream transported from the column eliminates the hot nitrogen in parallel with the sub-cooling of the liquid nitrogen stream. And a stream full of oxygen; And the cooling device consists of the first one, one main heat changer, with one pass that connects between the purification equipment and the distillation column. The second pass is in contact with the argon column so that the air is cooled before it enters the purification column. The high-purity oxygen product streams are completely heated in conjunction with air cooling, and the third and fourth passages contact the sub-cooling device. So that after heating up the product nitrogen stream and the useless nitrogen stream, the product nitrogen stream and the useless nitrogen stream are fully heated up in the first one, replacing the heat. Langsuan with air cooling 9. The success of Claim No. 8, also contains , Turbo expander Which is contiguous between the nitrogens eliminating column and the first pass of The first one turns the main heat. So that the partially cooled primary current is amplified in the turbo expander. And then it was induced into the nitrogen elimination column to maintain its thermal equilibrium success.