Abstract: A smelt spout area of a recovery boiler. A bank of smelt spouts is connected to a lower part of the boiler for directing smelt from the boiler to a dissolving tank. A working area is in front of the bank of smelt spouts. A shielding wall is located in front of the bank of smelt spouts and arranged movable in relation to the bank of smelt spouts to separate the bank of smelt spouts from the working area and persons working on the working area.

Abstract: A cleaning unit for smelt spouts of a recovery boiler. A motorized cleaning member is configured to clean smelt spouts of a recovery boiler. A motorized transfer device is configured to transfer the cleaning unit from the location of a first smelt spout to the location of a second smelt spout.

Abstract: A method and an apparatus for removing carbon dioxide (CO2) from sulphur dioxide containing (SO2) flue gases, wherein the flue gases are washed with washing solution in a scrubber, which comprises at least two washing stages. In the first washing stage the flue gases are washed for removing the sulphur dioxide in the flue gases and after that in the second washing stage for removing carbon dioxide (CO2). Sodium carbonate solution (Na2CO3) is used as washing solution in both the first and the second washing stages.

Abstract: A method for improving the operation safety of the smelt spout area of a recovery boiler, which smelt spout area comprises a working area (6), as well as smelt spouts (2) connected to the lower part of the boiler for directing the smelt from the boiler to a dissolving tank (4). In the method the smelt spouts (2) are separated from the working area (6) by a shielding wall (8, 10) arranged movable in relation to the smelt spouts. The invention also relates to a smelt spout area of a recovery boiler.

Abstract: A cleaning apparatus for a smelt spout of a recovery boiler, which apparatus comprises a motorized cleaning member (7) for cleaning the smelt spout (1). The cleaning apparatus further comprises a path (5) and a cleaning unit, which comprises motorized transfer means for transferring the cleaning unit to the location of the smelt spout (1) along the path.

Abstract: The composition of flue gas generated in a thermal process, especially in the combustion of bio fuel or refuse-derived fuel, is monitored by measuring the quantity of particles belonging to certain size categories in at least one point along the flow path of the flue gas. Such particle size categories are chosen as objects of the measurement, in which the particles are known to consist mainly of alkali chlorides.

Abstract: A method for treating fly ash of flue gas exiting a furnace of a fluidized bed boiler. A side flow conveying a first fraction of fly ash is separated from a flow conveying a second fraction of fly ash. After the separation, the side flow conveying the first fraction has a higher solids content than the flow conveying the second fraction. The first fraction of fly ash is separated from the side flow at a separation temperature of at least 400° C., whereafter the first fraction of fly ash is discharged from the process.

Abstract: A handling device for liquor guns (2) of a recovery boiler plant, which device comprises transfer means (11) for transferring a nozzle (7) of a liquor gun to the furnace (1) of a boiler and out from the furnace. In addition, the invention relates to a recovery boiler plant as well as a method in a recovery boiler plant.

Abstract: A method for treating lime mud, in which method the lime mud is conveyed to a lime kiln, where fuel gas is used as fuel, which fuel gas is formed by a circulating fluidized bed gasifier. A calcium compound is used as bed material in the gasifier. In addition, the invention relates to the use of a calcium compound in a lime mud treatment plant, as well as to a lime mud treatment plant.

Abstract: A pyrolysis apparatus comprises a substantially closed pyrolyzer (4), a supply inlet for supplying pyrolyzable fuel to the pyrolyzer (4), an outlet for taking hot bed material in particle form out of the pyrolyzer, one or more exit outlets (6) for taking condensible gaseous substances separated from the fuel to be pyrolyzed out of the pyrolyzer, a condenser (8) for condensing the condensible gaseous substances into pyrolysis oil, and a line (7) for transferring the condensible gaseous substances from the exit outlet of the pyrolyzer (4) to the condenser (8). The means for maintaining pyrolysis conditions in the pyrolyzer (4) comprise an inlet for taking hot bed material in particle form into the pyrolyzer and means (5) for supplying fluidizing gas to the pyrolyzer. The pyrolyzer (4) is a chamber bounded directly by a furnace (1) of a bubbling fluidized bed boiler, through which chamber fluidized bed material is arranged to be circulated between the inlet and the outlet.

Abstract: A pyrolysis apparatus comprises a furnace (1) operating by fluidized bed combustion, a pyrolyzer (4) and flow paths, which connect the furnace (1) and the pyrolyzer (4) for arranging the circulation (C) of carrier material of the fluidized bed combustion between the furnace and the pyrolyzer The apparatus also comprises a supply inlet (14) for supplying fuel to be pyrolyzed to the pyrolyzer (4), fluidizing gas supply means (5) arranged in the pyrolyzer for fluidizing the mixture of carrier material and fuel, and an outlet (6) for taking condensible gaseous substances separated from the fuel to be pyrolyzed out of the pyrolyzer (4), and a condenser for condensing the condensible gaseous substances.

Abstract: In a method for processing flue gases, flue gases from an incineration plant for non-condensable gases of a kraft pulp mill are scrubbed by means of a calcium compound. The calcium compound is lime mud taken from the chemical recirculation of the kraft pulp mill after causticization and before a lime reburning kiln, and it is used in the scrubbing of gas as a substance reacting with sulphur dioxide.

Abstract: A supply and a method for preventing corrosion on heat exchange surfaces of a boiler. Additional material is fed to flue gases of a boiler by at least one supply for additional material. The supply includes a cooled case beam that is hollow inside and several nozzles for feeding the additional material.

Abstract: A recovery boiler plant, which comprises a recovery boiler, wherein in the first part (1a) flue gases travel in a first direction (F1). The furnace also comprises a second part (1b), where the flue gases proceed in a second direction (F2), which second direction differs from the first direction (F1). In addition, the invention relates to a method in a recovery boiler.

Abstract: Method for treatment of spent liquor at a pulp mill, in which method at least a part of the spent liquor flow arriving from the evaporation plant is taken to a pyrolysis reactor, wherein it is pyrolysed at a temperature of 300-800° C. in order to separate evaporable compounds from the coke remaining in a solid state. The pyrolysis products, which are gases or liquids, may be used as fuel or they may be processed further. The coke resulting from the pyrolysis is burnt in a soda recovery boiler or in a gasification reactor to regenerate cooking chemicals. The method is suitable for recovery of chemicals and energy both in sulphate and sulphite processes and also in cooking methods based on organic solvents.

Abstract: A boiler plant, which comprises a boiler (2) and a frame (1) of a boiler house surrounding the boiler. In addition, the boiler plant comprises support structures (3), by which the walls of the boiler (2) are supported laterally to the frame (1) of the boiler house. In addition, the invention relates to a support structure (3) and a method for supporting the walls of a boiler (2) of a boiler plant.

Abstract: A method for reducing nitrogen oxide emissions of a bubbling fluidized bed boiler burning biofuel and an air distribution system for a bubbling fluidized bed boiler biofuel. A fluidized bed is arranged in a lower part of a furnace of the boiler. The bed is fluidized by fluidizing gas that includes primary air. Fuel is fed to the fluidized bed, which dries and pyrolizes into pyrolysis gas including volatile matter of the fuel. The gas rises upwards in the furnace and burns. Secondary air is supplied above the fluidized bed from secondary air nozzles, and tertiary air is supplied above the secondary air nozzles. A part of primary air is supplied in connection with fuel feeding such that the fuel is forced substantially on the surface of the fluidized bed, thus pyrolizing entirely, and at least a part of the pyrolysis gases formed in the pyrolysis is burned by primary air such that the air coefficient in relation to the volatile matter of fuel in the pyrolysis gases is in the substoichiometric area.

Abstract: A cleaning apparatus for a smelt spout of a recovery boiler, which apparatus comprises a motorized cleaning member (7) for cleaning the smelt spout (1). The cleaning apparatus further comprises a path (5) and a cleaning unit, which comprises motorized transfer means for transferring the cleaning unit to the location of the smelt spout (1) along the path.

Abstract: A method and an equipment for reducing sulphur dioxide emissions of a marine engine, wherein flue gases are scrubbed with a scrubbing solution in a scrubber. Fresh water with added sulphur removal reagent is used as the scrubbing solution.

Abstract: A heat control system of reheating steam of a power plant, in which method the reheating steam (S3) is superheated in a reheater in a first reheating stage and a second reheating stage. The steam (S6) superheated in the first reheating stage is directed via a heat exchanger (22) to the second reheating stage, and the temperature of the steam decreases in the heat exchanger. In addition, the invention relates to a heat control system and a power plant.