Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
  • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
  • H04N21/47—End-user applications
  • H04N21/478—Supplemental services, e.g. displaying phone caller identification, shopping application
  • H04N21/4782—Web browsing, e.g. WebTV
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
  • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
  • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
  • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
  • F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
  • F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
  • F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
  • F01K23/067—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle the combustion heat coming from a gasification or pyrolysis process, e.g. coal gasification
  • F01K23/068—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle the combustion heat coming from a gasification or pyrolysis process, e.g. coal gasification in combination with an oxygen producing plant, e.g. an air separation plant
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
  • F02C3/00—Gas-turbine plants characterised by the use of combustion products as the working fluid
  • F02C3/20—Gas-turbine plants characterised by the use of combustion products as the working fluid using a special fuel, oxidant, or dilution fluid to generate the combustion products
  • F02C3/26—Gas-turbine plants characterised by the use of combustion products as the working fluid using a special fuel, oxidant, or dilution fluid to generate the combustion products the fuel or oxidant being solid or pulverulent, e.g. in slurry or suspension
  • F02C3/28—Gas-turbine plants characterised by the use of combustion products as the working fluid using a special fuel, oxidant, or dilution fluid to generate the combustion products the fuel or oxidant being solid or pulverulent, e.g. in slurry or suspension using a separate gas producer for gasifying the fuel before combustion
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
  • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
  • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
  • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
  • F25J3/04521—Coupling of the air fractionation unit to an air gas-consuming unit, so-called integrated processes
  • F25J3/04527—Integration with an oxygen consuming unit, e.g. glass facility, waste incineration or oxygen based processes in general
  • F25J3/04539—Integration with an oxygen consuming unit, e.g. glass facility, waste incineration or oxygen based processes in general for the H2/CO synthesis by partial oxidation or oxygen consuming reforming processes of fuels
  • F25J3/04545—Integration with an oxygen consuming unit, e.g. glass facility, waste incineration or oxygen based processes in general for the H2/CO synthesis by partial oxidation or oxygen consuming reforming processes of fuels for the gasification of solid or heavy liquid fuels, e.g. integrated gasification combined cycle [IGCC]
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
  • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
  • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
  • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
  • F25J3/04521—Coupling of the air fractionation unit to an air gas-consuming unit, so-called integrated processes
  • F25J3/04593—The air gas consuming unit is also fed by an air stream
  • F25J3/04606—Partially integrated air feed compression, i.e. independent MAC for the air fractionation unit plus additional air feed from the air gas consuming unit
• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06F—ELECTRIC DIGITAL DATA PROCESSING
  • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
  • G06F16/90—Details of database functions independent of the retrieved data types
  • G06F16/95—Retrieval from the web
  • G06F16/957—Browsing optimisation, e.g. caching or content distillation
  • G06F16/9577—Optimising the visualization of content, e.g. distillation of HTML documents
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
  • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
  • H04N21/41—Structure of client; Structure of client peripherals
  • H04N21/422—Input-only peripherals, i.e. input devices connected to specially adapted client devices, e.g. global positioning system [GPS]
  • H04N21/42204—User interfaces specially adapted for controlling a client device through a remote control device; Remote control devices therefor
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
  • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
  • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
  • H04N21/443—OS processes, e.g. booting an STB, implementing a Java virtual machine in an STB or power management in an STB
  • H04N21/4438—Window management, e.g. event handling following interaction with the user interface
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N5/00—Details of television systems
  • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
  • H04N5/445—Receiver circuitry for the reception of television signals according to analogue transmission standards for displaying additional information
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
  • F25J2240/00—Processes or apparatus involving steps for expanding of process streams
  • F25J2240/80—Hot exhaust gas turbine combustion engine
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
  • Y02E20/00—Combustion technologies with mitigation potential
  • Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
  • Y02E20/18—Integrated gasification combined cycle [IGCC], e.g. combined with carbon capture and storage [CCS]

Definitions

• the invention relates to the manufacture and combustion of synthesis gas, or syngas, for power generation.
• the invention relates to more efficient utilization of a combustion turbine.
• the process of gasifying carbonaceous material requires high pressure air.
• the more efficient gasification reactors operate at pressures in excess of 10 atmospheres, often in excess of 80 atmospheres pressure.
• the carbonaceous material is gasified in a partial oxidation reactor by reacting with limited quantities of oxygen containing gas.
• the most efficient gasification processes use substantially pure, greater than 95 mole percent, oxygen.
• an air separation plant is supplied with compressed air.
• the product of the air separation plant are two streams, one of substantially pure oxygen and the other principally nitrogen.
• the oxygen is at a lower pressure than the air stream that was sent to the air separation unit, and the oxygen often needs to be compressed again prior to introduction to the reactor.
• a gasification/power generation unit usually comprises an air separation unit, a gasifier, and a combustion turbine.
• the air separation unit provides oxygen to the gasifier.
• the gasifier converts oxygen and hydrocarbon into clean burning gaseous fuel, i.e. syngas.
• the combustion turbine uses the fuel from the gasifier to generate power.
• Combustion turbines are commercially available in discreet sizes. Therefore, on projects where the amount of power desired is fixed or where the amount of feed to the gasifier is fixed, the combustion turbine is sometimes too large for the desired application which hurts the economics of the project.
• Typical systems are described in, for example, US Patent Nos. 4,017,272; 5,081,845; 5,295,350; 5,394,686; 5,410,869; 5,421,166; 5,501,078; 5,609,041 which are incorporated herein by reference. What is needed is a process to make more efficient utilization of the combustion turbine, regardless of whether the supply of syngas is fixed or whether the amount of power desired is fixed.
• the invention is a process for generating power from syngas in a combustion turbine that includes an air compressor, a combustor, and an expansion turbine.
• the invention involves continuously withdrawing a fraction of the compressed air from the air compressor and supplying this compressed air to an air separation unit used in the manufacture of the syngas, wherein the supplied compressed air provides a fraction of the compressed air requirements of an air separation unit used in the manufacture of the syngas.
• the invention also involves continuously mixing gaseous hydrocarbons with the synthesis gas to produce a fuel gas, controlling the quantity of gaseous hydrocarbons added to the fuel gas to match the air compressor output with combustor air requirements, and introducing the fuel gas to the combustor.
• the two processes are advantageously used in combination.
• combustion turbine is an apparatus that includes an air compressor, a combustor, and a turbine expander. Air is compressed to supply the oxygen required for combustion. The compressed air is then fed into the combustor with a fuel gas. The products of combustion travel through an expander to generate power.
• synthesis gas or “syngas” refers to gases comprising hydrogen gas, carbon monoxide gas, or mixtures thereof.
• the ratio of hydrogen to carbon monoxide may, but need not necessarily, be about one to one.
• the invention is a process to generate power with syngas.
• Syngas can be manufactured by any partial oxidation method.
• the syngas is manufactured in a partial oxidation, or gasification, reactor wherein carbonaceous fuels are reacted with oxygen to create hydrogen and carbon monoxide.
• the gasification processes are known to the art. See, for example, U.S. Patent 4,099,382 and U.S. Patent 4,178,758, the disclosures of which are incorporated herein by reference.
• the gasification process utilizes substantially pure oxygen, that is, a gas with above about 95 mole percent oxygen.
• Combustion turbines are integral units that consist of a combustor, an expansion turbine, and an air compressor. These units are designed for conventional fuel, such as natural gas.
• the principal component of natural gas is methane.
• One methane molecule combines with two oxygen molecules, which are obtained from the air compressor, in a combustion process.
• two syngas molecules be they hydrogen gas, carbon monoxide, or both, react with only one oxygen molecule in a combustion process. Therefore, the combustion of a given quantity of syngas requires roughly one fourth of the air required to combust a similar quantity of natural gas.
• the air compressor, combustor, and turbine in a combustion turbine are matched for the higher compressed air demands of a fuel such as natural gas.
• the air compressor portion of the combustion turbine is oversized when synthesis gas from a gasifier is used as the fuel. Because these units are manufactured and sold in discrete sizes, they are also usually oversized for a particular application. If the amount of power needed from the turbine is fixed, the power output from the combined cycle unit must be reduced. In the present invention, this is accomplished by extracting air from the combustion turbine's air compressor to be used as feed to the air separation unit. This reduces the power output of the combustion turbine and reduces the capital cost of the project by decreasing the air compressor size in the air separation unit.
• the invention therefore comprises a process for generating power from syngas in a combustion turbine comprising an air compressor, a combustor, and an expansion turbine.
• the process comprises continuously withdrawing a fraction of the compressed air from the air compressor, and supplying this compressed air to air an separation unit used in the manufacture of the synthesis gas, wherein the supplied compressed air provides a fraction of the compressed air requirements of the air separation unit.
• the air separation unit supplies oxygen that is used in the manufacture of the synthesis gas. At least about 20 percent, preferably at least about 40 percent, and more preferably at least about 50 percent of the air compressor output supplied by the combustion turbine is sent to the air separation unit. This compressed air then is converted to a portion of the oxygen-containing gas that is fed to the gasification reactor.
• the amount of compressed air from the combustion turbine diverted to the air separation unit can advantageously regulated with, for instance, a variable position control valve.
• a variable position control valve In the event the gasification reactor is running at a reduced output, the amount of oxygen required by the gasification reactor will decrease. If supplemental fuel such as natural gas is added to keep the turbine operating, the combustion turbine oxygen requirements may well increase.
• a variable position valve can advantageously be used to divert compressed air to the power generation system where the air is most needed, be it the combustor or the air separation unit.
• the invention therefore also comprises a process for generating power with syngas in a combustion turbine comprising an air compressor, a combustor, and an expansion turbine.
• the invention involves monitoring the syngas flow to detect increases or decreases in the rate of syngas, continuously mixing gaseous hydrocarbons with the synthesis gas to produce a fuel gas, controlling the quantity of gaseous hydrocarbons added to the fuel gas to match the air compressor output with combustor air requirements or to match absolute combustor capacity, and introducing the fuel gas to the combustor.
• the process of monitoring the syngas flow to detect increases or decreases in the rate of syngas simply is useful to vary the amount of gaseous hydrocarbons added. If the quantity of gaseous hydrocarbons added is essentially fixed, there is no need to monitor the syngas rate.
• This process more fully utilizes the combustion turbine capacity.
• air compressor output to combustor air requirements it is meant that the air compressor output to the combustor provides between about 90% and 130%, preferably between about 96% and 104%, of the air required for complete combustion of the fuel gas introduced to the combustor.
• complete combustion of the fuel gas it is meant that at least 95 weight percent of the combustable components, i.e., carbon monoxide, hydrogen, and hydrocarbons, in the fuel gas are oxidized to carbon dioxide and water.
• the syngas is continuously mixed with gaseous hydrocarbons. Gases can be mixed by commingling in the pipe or in the combustor. If the gaseous hydrocarbon is a finely dispersed droplets of liquid, then the droplets may be suspended in the syngas or in a separate stream of gas which can then be commingled with the syngas.
• the gaseous hydrocarbons comprise one or more of natural gas, gaseous light hydrocarbons, or liquid fuel droplets finely dispersed in gas.
• Gaseous light hydrocarbons include natural gas liquids such as ethane, propane, butanes, pentanes, hexanes, or mixtures thereof.
• the combustion turbine It is often advantageous to operate the combustion turbine at the capacity of the combustor. There will often be excess compressed air capacity if the fuel is a mixture of natural gas and syngas, and the combustor capacity may be limited by the gaseous throughput capacity of the combustor. However, if the supplemental fuel is gaseous light hydrocarbons or finely dispersed liquid hydrocarbons, then the combustor capacity may be limited by the compressed air supply. Finally, the combustor capacity may be limited by the power generating capacity of the combustion turbine.
• the output of the combustion turbine can be stabilized. This in turn allows the combustion turbine to supply compressed gas to the air separation unit when the gasifier is inoperative.
• the supplemental fuel can allow the turbine to run during periods when syngas production is severely limited or interrupted.
• At least 25 percent of the heating value of the fuel gas originate from the supplemental gaseous hydrocarbons during normal operations.
• the gaseous hydrocarbons and the syngas are advantageously mixed prior to introduction to the combustor, to insure the fuel gas is well mixed. It is advantageous to have a variable position control valve, or other flow controller, on the gaseous hydrocarbon inlet line, so that the amount of gaseous hydrocarbons introduced to the fuel gas can be varied to meet power requirements, or to smooth out variations in the syngas production rate to keep the combustion turbine operating at a desired capacity, or to match the combustion turbine air compressor output to the combustor with the oxygen requirements of the fuel gas. At times when syngas production is high, the amount of gaseous hydrocarbons added to the fuel may be reduced. However, it is advantageous to always add some gaseous hydrocarbons to the fuel gas.
• the heating value of the fuel gas, and subsequently the amount of air required to achieve complete combustion, will depend on this fraction. It is therefore advantageous to have a means of controlling the valve that allows diversion of compressed air from the combustion turbine to the air separation unit be affected by the amount of gaseous hydrocarbons in the fuel gas. If the fuel gas has an increased fraction of gaseous hydrocarbons, the amount of compressed air diverted to the air separation unit may have to be reduced to supply sufficient air to the combustor.
• the preferred gaseous hydrocarbon is natural gas.
• Pipeline quality natural gas is a gas comprising usually at least about 95 mole percent methane.
• the natural gas used in the present invention need not be pipeline quality, and may contain substantial quantities of inerts such as carbon dioxide and nitrogen.
• the natural gas preferably comprises at least about 50, more preferably at least about 75, mole percent methane. In applications wherein the gaseous hydrocarbons comprise natural gas, it is preferred that at least about 25 percent, more preferably at least about 40 percent, and most preferably at least about 50 percent by volume of the fuel gas comprises natural gas.
• the gaseous hydrocarbons comprise at least about 20, more preferably at least about 30 percent of the heating value of the fuel gas, and it is also preferred that at least about 15, more preferably at least about 30 percent of the air compressor output supplied by the combustion turbine is bypassed to the air separation unit.
• FIG. 1 is a schematic of a embodiment of the invention, comprising a gasifier (10), an air separation unit (12) that supplies oxygen to the gasifier (10) through the conducting means (28), an air compressor (14) that takes low pressure or atmospheric pressure air from conducting means (32) and supplies at least a portion of the compressed air required by the air separation unit (12), a combustion turbine comprising a combustion turbine air compressor (18), a combustor (20), and an expansion turbine (22).
• Syngas is conveyed to the combustor (20) hrough the conducting means (16), and supplemental gaseous hydrocarbon fuel is conveyed to the combustor (20) through the conducting means (24).
• the syngas and supplemental gaseous hydrocarbon fuel are advantageously mixed before reaching the combustor (20).
• Excess compressed air from the combustion turbine air compressor (18) is conveyed to the air separation unit (12) through the conducting means (24).

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Multimedia (AREA)
• Signal Processing (AREA)
• Physics & Mathematics (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Thermal Sciences (AREA)
• Theoretical Computer Science (AREA)
• Human Computer Interaction (AREA)
• Databases & Information Systems (AREA)
• Software Systems (AREA)
• General Physics & Mathematics (AREA)
• Data Mining & Analysis (AREA)
• Power Engineering (AREA)
• Engine Equipment That Uses Special Cycles (AREA)
• Industrial Gases (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=21956684

Family Applications (1)

Country Status (8)

Families Citing this family (5)

Family Cites Families (6)

• 1998
  • 1998-06-05 CN CN98807312A patent/CN1264460A/zh active Pending
  • 1998-06-05 KR KR19997011346A patent/KR20010013350A/ko not_active Application Discontinuation
  • 1998-06-05 WO PCT/US1998/012061 patent/WO1998055811A1/en not_active Application Discontinuation
  • 1998-06-05 AU AU78345/98A patent/AU741118B2/en not_active Ceased
  • 1998-06-05 PL PL98338642A patent/PL338642A1/xx unknown
  • 1998-06-05 JP JP50317099A patent/JP2002511127A/ja active Pending
  • 1998-06-05 CA CA002291632A patent/CA2291632A1/en not_active Abandoned
  • 1998-06-05 EP EP98926531A patent/EP0986725A1/de not_active Withdrawn

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events