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| Number | Title | Issue Date |
| 7988820 | Method for cleaning and/or cooling a liquor gun in a chemical recovery boiler An apparatus for cleaning and cooling a liquor nozzle, the nozzle including at least a liquor tube for feeding liquor and chemicals into a furnace of a recovery boiler. The apparatus includes an outer casing tube, which defines a space whereto conduits are provided ... | 08/02/2011 |
| 7364640 | Chemimechanical desilication of nonwood plant materials A process for removing silica from nonwood plant materials involving both chemical and mechanical action is described. The silica-rich epidermal cells are liberated mechanically by a pre-pulping and low-consistency refining step and subsequently removed from the pul... | 04/29/2008 |
| 7351987 | Irradiation system with ion beam An irradiation system comprises a beam generation source, a mass analysis device, a beam transformer, a deflector for scanning which swings the beam reciprocally, a beam parallelizing device, an acceleration/deceleration device, and an energy filtering device. Accor... | 04/01/2008 |
| 7207280 | Combustion air system for recovery boilers, burning spent liquors from pulping processes An arrangement is disclosed for supplying an air jet form to the furnace of a recovery boiler, where the furnace has a front wall, a rear wall and side walls. Black liquor spraying devices are disposed on the furnace walls at one or several levels of the furnace. A ... | 04/24/2007 |
| 7198695 | Method for separating hemicelluloses from a biomass containing hemicelluloses and biomass and hemicelluloses obtained by said method The invention relates to a method for separating hemicelluloses from a biomass containing hemicelluloses. The method includes the steps of: a) extracting the hemicelluloses from the biomass containing hemicelluloses by treating them with a complex compound in an aqu... | 04/03/2007 |
| 6500301 | Apparatus for gasification of spent liquor Arrangement for understoichiometric gasification of spent liquor from chemical pulp production, comprising an upper reactor part (2), which upper reactor part is provided with a burner (5) for the spent liquor and with an internally clad reactor jacket (4... | 12/31/2002 |
| 6425976 | Method for black liquor gasification in recovery boilers The invention refers to a method for black liquor gasification in recovery boilers, of the type having a lower portion, referred to as a lower furnace and an upper portion, referred to as an upper furnace, black liquor sprayers for introduction of black l... | 07/30/2002 |
| 6408771 | Methods of improving productivity of black liquor recovery boilers Methods are presented to increase the throughput of a recovery boiler equipped with at least primary and secondary levels of injection of air. The methods comprise operating the recovery boiler with a third level of oxidant injection below or at the same ... | 06/25/2002 |
| 6287415 | Arrangement in soda recovery boiler for removing melts for maintenance Arrangement in a soda recovery boiler, comprising normal melt chutes (6) for removing molten salt from the recovery boiler (1). The recovery boiler (1) comprises an outlet (8), mounted in the wall of the recovery boiler such that it is situated lower down... | 09/11/2001 |
| 6228214 | Method for black liquor gasification in recovery boilers The invention refers to a method for black liquor gasification in recovery boilers, of the type having a lower portion, referred to as a lower furnace and an upper portion, referred to as an upper furnace, black liquor sprayers for introduction of black l... | 05/08/2001 |
| 6186080 | Recovery boiler A boiler recovers a soda component from pulp spent liquor and is able to prevent carry-over of unburnt char and deformation of a char bed configuration and to attain a stable combustion with low NOx generation. By regulating the combustion air ... | 02/13/2001 |
| 6183598 | Process for recovering alkali and black liquor containing silicatae The invention relates to a process for recovering alkali and heat from a black liquor (5) containing silicate from a soda cook of e.g. grass, reed, straw and bagasse. In the process the black liquor (5) is treated with a gas (6) containing carbon dioxide ... | 02/06/2001 |
| 6168685 | Process FOR oxidation of concentrated black liquor Concentrated black liquor formed in a kraft pulp mill process is treated to effect exothermal oxidation of black liquor solids, so as to heat the concentrated black liquor and consume a proportion of the black liquor solids. Such procedure eliminates the ... | 01/02/2001 |
| 6155210 | Process for obtaining flue gases with low content of NOx while combusting black liquor and a recovery boiler therefor The invention relates to a method of firing black liquor in recovery boilers where the intention is to get fumes having a low content of nitrogen oxides (NOx). The invention is characterized in that a part of the combustion air is added as a la... | 12/05/2000 |
| 6071377 | Process for obtaining flue gases with low content of NOx in a black liquor recovery boiler The invention relates to a process for combusting black liquor in recovery boilers where the intention is to obtain flue gases which have a low content of nitrogen oxides (NOx). The invention is characterized in that ammonia is supplied to a pa... | 06/06/2000 |
| 6030493 | Process for recovering chemicals and energy from cellulose spent liquor using multiple gasifiers Provided is a process for recovering chemicals and energy from spent liquor obtained when producing paper pulp by chemical delignificatation of fibrous raw material. The spent liquor is gasified in at least two reactors, a first and a second stream of sol... | 02/29/2000 |
| 6027609 | Pulp-mill recovery installation for recovering chemicals and energy from cellulose spent liquor using multiple gasifiers A Pulp Mill Recovery installation for producing liquors containing different concentrations of recovered process chemicals or combustion gasses containing different concentrations of process chemicals from a spent liquor obtained from the production of pu... | 02/22/2000 |
| 5992337 | Methods of improving productivity of black liquor recovery boilers Methods of increasing the throughput of recovery boilers equipped with at least two levels of injection of air, the methods improving the thermal efficiency of the boiler with oxygen enrichment of the air in at least one level of the combustion air system... | 11/30/1999 |
| 5989387 | Method for controlling chloride concentration in the flue gas of a recovery boiler A method for adjusting the chlorine equilibrium in a sulphate cellulose process, wherein part of the chlorine contained in the cycle is separated and removed. In the method, strong odour gases from the sulphate cellulose process are introduced into a soda... | 11/23/1999 |
| 5976318 | Method for burning secondary sludge in a recovery boiler A method for burning secondary sludge in a recovery boiler, in which method secondary sludge is mixed with black liquor. According to the method, an alkali is added to the secondary sludge so as to obtain a mixture having a pH of over 7, whereafter the mi... | 11/02/1999 |
| 5814189 | Method for gasifying cellulose spent liquor to produce superheated steam and green liquor of low carbonate concentration Provided is a novel process for the preparation of an aqueous solution of alkaline compounds from a generator gas, containing carbon monoxide, carbon dioxide, hydrogen and entrained alkaline compounds, which gas has been formed during partial combustion o... | 09/29/1998 |
| 5746886 | Method for the recovery of energy and chemicals from cellulose spent liquor containing potassium using a gasifier The present invention relates to a method for producing pulp cooked under alkaline conditions, in which method cellulose-containing material is brought into contact, in a digester, with an alkaline cooking liquor containing dissolved potassium and sodium ... | 05/05/1998 |
| 5707490 | Method of recovering energy from waste liquors from pulp processes A method of recovering energy from waste liquors from cellulose pulp processes produces high quality superheated steam, a savings in material costs is achieved, and the utilization factor of the pulp mill is improved (that is the number of shutdowns for s... | 01/13/1998 |
| 5683549 | Process for the partial combustion of cellulose spent liquor using twin fluid nozzle burner The present invention is directed to a process for efficient combustion of cellulose spent liquors using a burner connected to a reactor, while supplying an oxygen containing gas, which invention is characterized in that more than 80% of the oxygen which ... | 11/04/1997 |
| 5683550 | Method and apparatus for increasing recovery boiler capacity by withdrawing combustible gas from the furnace A method and system for treating waste liquors from pulping processes for recovering energy and chemicals from the waste liquors (such as kraft black liquor). A recovery boiler having a furnace for combusting waste liquor includes a plurality of injection... | 11/04/1997 |
| 5672246 | Increasing the capacity of a recovery boiler by withdrawing some of the exhaust gases from the furnace section Waste liquor from cellulose pulp processes is used in a recovery boiler to recover energy and chemicals. The recovery boiler includes a furnace section in which heat and exhaust gases are generated, and heat recovery surfaces downstream of the furnace sec... | 09/30/1997 |
| 5660685 | Gasifying black liquor with recycling of generated hydrogen sulphide gas to the gasifier A method of preparing a digesting liquor having high sulphidity from a spent liquor obtained from digesting cellulosic fiber material, optionally without a conventional causticizing step is provided. Thermal decomposition of the spent liquor is conducted ... | 08/26/1997 |
| 5637192 | Endothermic spent liquor recovery process Resonant tubes of a pulse combustor are immersed in a bed of solid particles in a reaction zone to provide indirect heat from the pulsating combustion gases to the solid particles of the bed. The bed is maintained in an agitated state by a gas or vapor fl... | 06/10/1997 |
| 5632858 | Method for gasifying cellulosic waste liquor using an injector located within the bed of fluidized material A system for providing heated fluidized bed gasification of a residual waste liquor provides a bed of granular material and a source of liquor provided to the material bed. An injector is situated in the material bed and communicates with an air source, a... | 05/27/1997 |
| 5603803 | Method and apparatus for recovering heat in a spent liquor recovery boiler A method and apparatus for use in the pulp industry for recovering heat in the spent liquor recovery boiler, whereby the boiler walls are formed of water-cooled tubes connected to the water/steam circulation system of the boiler. The lower section of the ... | 02/18/1997 |
| 5562804 | Method for adjusting the sulphur/sodium ratio in the flue gases of a soda recovery boiler A method for adjusting the sulphur/sodium ratio in a soda recovery boiler when strong sulphurous odour gases are burned therein. According to the method, sodium is introduced into the soda recovery boiler in an amount proportional to the amount of sulphur... | 10/08/1996 |
| 5549788 | Minimal effluents discharge pulp mill with chemical recovery Effluents are minimized from a cellulose pulp mill having a recovery boiler by concentrating liquid effluents from the bleach plant and/or liquid spills from process streams, incinerating the concentrated effluents in the recovery boiler, removing particl... | 08/27/1996 |
| 5547543 | Apparatus for minimizing effluent discharges and recovering chemicals in a pulp mill Apparatus for a pulp and paper mill, and methods of acting on liquid effluents produced in the mill, which minimizes the discharge of polluting gaseous and liquid effluents to the environment. Liquid effluents from the bleach plant are concentrated (e.g. ... | 08/20/1996 |
| 5509997 | Method of recovering energy from waste liquors from pulp processes Method of recovering energy from waste liquors from pulp processes, wherein the waste liquor is burned in a waste liquor recovery boiler and energy is recovered from the flue gases by producing saturated or partially superheated steam in the recovery boil... | 04/23/1996 |
| 5507912 | Kraft pulping process wherein sulphide-rich and sulphide-lean white liquors are generated There is disclosed a process of increasing efficiency in a kraft pulping process that utilizes initial, bulk, and final delignification steps, a recovery boiler, and a caustic treatment step, which allows production of a white liquor stream that is separa... | 04/16/1996 |
| 5486269 | Gasification of carbonaceous material in a reactor having a gasification zone and a combustion zone A method and reactor for thermally decomposing a carbonaceous raw material (6) to recover gas and, if applicable, solid or liquid chemicals, the raw material being fed into a chamber (2) for gasification under under-stoichiometric conditions, the gasifica... | 01/23/1996 |
| 5454908 | Recovery boiler and method of reducing NOx emissions The invention relates to a method of firing black liquor in recovery boilers where the intention is to obtain fumes having a low content of nitrogen oxides (NOx). A part of the combustion air is added as a last portion at a very high level so t... | 10/03/1995 |
| 5439557 | Method of recovering energy and chemicals from a spent liquor using low frequency sound in a recovery boiler A method of recovering energy and chemicals from a spent liquor which, after thickening to a dry content of 50-90%, is fed into a reaction chamber (1) in which a plurality of temperature zones are maintained, said method comprising the steps of (a) conver... | 08/08/1995 |
| 5425850 | CFB black liquor gasification system operating at low pressures A black liquor gasification system intended for use as a replacement for a Tomlinson cycle, Chemical Recovery Unit, and which operates at a temperature below the ash melting temperature thereby removing the potential for smelt-water reactions and explosio... | 06/20/1995 |
| 5405496 | Process for the preparation of cooking liquors having high sulphidity for sulphate pulp cooking The invention relates to a process for preparation, under reducing conditions, of cooking liquors having high sulphidity for sulphate pulp cooking, wherein the black liquor obtained in the cooking process is fed, after evaporation, completely or partly to... | 04/11/1995 |
