Abstract:
A cryogenic method for capturing carbon dioxide in the gaseous emissions produced from the fossil-energy combustion of solid, liquid, or gaseous fossil fuels in a power generation installation (12) employing an OxyFuel mode of combustion. The method includes: producing essentially pure carbon dioxide under elevated pressure and at near ambient temperatures in a Carbon-Dioxide Capture Component (10) from the carbon-dioxide content of at least a part of the gaseous emissions produced from fossil-energy fueled combustion in the Oxyfuel mode of combustion; separating atmospheric air in an Air Separation Component (12) into a stream of liquid nitrogen and a stream of high-purity oxygen; supplying low temperature, compressed purified air to a cryogenic air separation unit (cold box) (302) within the Air Separation Component; collecting low temperature thermal energy from coolers employed within the Carbon-Dioxide Capture Component and the Air Separation Component; and converting the collected thermal energy to electricity within a Thermal-Energy Conversion Component (14).
Abstract:
In subambient cascaded fractional distillations such as air separation, ethane-ethylene separation, or nitrogen rejection from natural gas, the improvement provides an advantageous means of generating the optimal amount of intermediate reflux liquid for both rectifications in the cascade. A latent heat exchanger (415) is provided in which a liquid from the HP rectifying section (403) of the cascade exchanges latent heat with a minor fraction of the feed gas. The condensed feed is then split by two valves (409, 410) into respective intermediate reflux streams for both parts of the cascade (402, 403).
Abstract:
A means of producing at least one of high purity nitrogen and low to medium purity oxygen (up to 97 % purity) at high recovery (above 96 % for oxygen). The LP column efficiency is improved to reduce the energy requirement, without offsetting reduction in LN2 reflux availability. Referring to Figure 1, this is done by providing intermediate height reboil to LP column (3) by a latent heat exchanger (10) in which HP rectifier (5) overhead N2 vapor which has been partially expanded in expander (9) is condensed and kettle liquid is evaporated. The condensed N2 is then used to reflux column (3) after depressurization by valve (13).
Abstract:
A means of producing high purity oxygen at high recovery plus also byproduct argon while using a low air supply pressure. This is done with a triple pressure distillation arrangement (columns 101, 102, and 103 of Figure 1) having argon stripping sections at the bottom of both the MP (102) and LP (103) columns, a liquid sidestream withdrawal (117) from the MP column, forming feed for the LP column, an intermediate reflux (118) for the LP column which reboils the MP column, and an argon removal capability.
Abstract:
Dans un procédé de fourniture d azote au moyen d un appareil de production d azote gazeux par séparation d air (9) et par vaporisation d azote liquide provenant d un stockage (1), si les besoins du client en azote gazeux sont inférieurs à un premier seuil, le client est fourni en azote exclusivement par vaporisation d azote liquide et si les besoins du client en azote gazeux sont supérieurs à un deuxième seuil, le deuxième seuil étant supérieur au premier seuil, le client est fourni en azote au moins partiellement par l appareil de production d azote.
Abstract:
The invention relates to a method of enriching a pressurised gas stream (1) with one of the components (A) thereof. The inventive method comprises the following steps: the stream is separated into at least first and second fractions (2, 3); at least one part of the first fraction (2) is sent to a separation unit (ASU); the separation unit supplies at least two discharges, including a first discharge (10) having a greater A content than that of the fraction (2) supplied to the separation unit; at least one part of the first discharge (10) is mixed with at least one part of the second fraction (3) such as to form a pressurised gas mixture (15); the second fraction (3) is expanded and, subsequently, at least one part of the first discharge (10) is mixed therein.
Abstract:
The invention relates to a process for producing oxygen or air enriched with oxygen, in which process: The air entering the process is cooled in a heat exchanger (14) to near to the condensation point of air and the air is led to a separation unit (10) formed of two or more chambers connected thermally to each other and comprising A and B halves (11, 12), in which it is divided, using liquidization and evaporation processes, into two or more gaseous fractions. The process air is maintained at normal temperature, except for small pressure differences to maintain the flow of the air and to optimize the process. When the process air flows through the A half of the separation unit, the liquid oxygen concentrate separated from it is evaporated in the B half (12) of the separation unit at such a pressure, lower than normal pressure, that the desired composition is obtained for the oxygen concentrate and the heat of liquidization released in the A half (11) of the unit is transferred to the B half (12) of the unit and is bound in it to the evaporation of the oxygen concentrate. The low-oxygen-content process air leaving the A half (11) of the separation unit is led out of the process through the heat exchanger (14). The oxygen concentrate evaporated in the B half (12) of the separation unit exits at the lower than normal pressure prevailing in the half in question, either as such, or through a boosting and cooling process to the heat exchanger (14), and from there out of the process. The liquidization and evaporation processes are carried out in the said separation unit (10) in nearly reversible conditions, in such a way that the gas phase in each process and in each part of the separation unit is nearly in equilibrium with the liquid phase in the same part.
Abstract:
The invention concerns a method for air distillation with production of argon using an air distilling installation (1) comprising an air distilling apparatus (2) in particular with double column, and at least one column for producing impure argon, the installation having dimensions for supplying argon with a nominal yield rho n of argon extraction at the impure argon producing column output. For reduced argon production requirements corresponding to a required yield rho of argon extraction at the impure argon producing column output, with rho
Abstract:
The invention relates to a method and a device for evaporating liquid oxygen. During normal operation, liquid oxygen is introduced into a main evaporator (3) where it is partially evaporated, a first rinsing stream (5) is removed from the main evaporator (3) as a liquid, the first rinsing stream (5) is partially evaporated in a supplementary evaporator (6) and a second rinsing stream (7) is removed from the supplementary evaporator (6) as a liquid. Normal operation is then interrupted by a heating up mode in which no liquid (5) is guided out of the main evaporator (3) into the supplementary evaporator (6) and the supplementary evaporator (6) is heated up to a significantly higher temperature than its temperature during normal operation.
Abstract:
A request to initiate startup of an air separation plant (200) may be received (610), and, in response to receiving the request, startup information that identifies a sequence of steps to be automatically executed to start up the air separation plant (200) is retrieved (620). Each step may be associated with a component of the air separation plant (200), and may be associated with an action and a set of permissives corresponding to the action. The set of permissives for each action may specify one or more parameters for controlling the execution of the corresponding action. After retrieving the startup information (620), the system may automatically initiate execution of the sequence of steps (630), and may monitor the execution of each of the steps (640). The system may determine (660), based on the monitoring, whether to modify a parameter specified by one of the permissives corresponding to an executed action.