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公开(公告)号：US12039239B2
公开(公告)日：2024-07-16
申请号：US17183962
申请日：2021-02-24
Applicant: Valmet Automation Oy
Inventor： Jarmo Mansikkasalo
CPC classification number: G06F30/28 , D21C3/228 , D21C11/0057 , F23G7/04 , G06F30/27 , G06F2113/08
Abstract: A method for obtaining information on quality of combustion of a liquor in a chemical recovery boiler. The method comprises entering a value of a first input parameter to a computational model configured to determine, based on the value of the first input parameter, a value of the quality of combustion of the liquor in the chemical recovery boiler, and at a first time, running the computational model to obtain a first modelling result. The method comprises measuring, from the chemical recovery boiler a value indicative of carryover to obtain a measurement result; comparing the first modelling result with [a] the measurement result or [b] a result derived from the measurement result, to obtain a primary comparison result; and adjusting the value of the first input parameter based on the primary comparison result to obtain an adjusted value of the first input parameter. The method comprises entering the adjusted value of the first input parameter to the computational model, and at a second time, running the computational model to obtain the information on quality of combustion of the liquor in the chemical recovery boiler.
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Patent Agency Ranking
2.发明授权公开(公告)号：US11746470B2
公开(公告)日：2023-09-05
申请号：US17015635
申请日：2020-09-09
Applicant: Valmet Automation Oy
Inventor： Jarmo Mansikkasalo , Jukka Koskinen
CPC classification number: D21C11/12 , F23G7/04 , F22B1/20 , F22B35/00 , F23G5/50 , F23G2207/101 , F23G2209/101
Abstract: A method for controlling carryover in a chemical recovery boiler. The method comprises feeding black or brown liquor to a furnace of the chemical recovery boiler through an injection gun to burn the black or brown liquor. The chemical recovery boiler comprises a bullnose, which narrows the furnace, and a first superheater, of which at least a part is arranged at a higher vertical level than the bullnose. The method comprises measuring information indicative of a spatial temperature distribution on a cross section of the furnace, wherein the cross section is above the injection gun and below the first superheater; determining primary information indicative of carryover using the information indicative of the spatial temperature distribution on the cross section of the furnace; and controlling a temperature of the black or brown liquor that is fed to the furnace using the primary information. In addition, a system for performing the method.
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公开(公告)号：US10655849B2
公开(公告)日：2020-05-19
申请号：US15997140
申请日：2018-06-04
Applicant: Valmet Automation Oy
Inventor： Jarmo Mansikkasalo , Jukka Koskinen
IPC: F23B90/00 , F23J15/02 , F22G1/02 , F22G5/04 , F23G7/04 , F23J1/00 , F22D1/12 , D21C11/06 , D21C11/10 , D21C11/12
Abstract: The method in a recovery boiler comprises estimating the first melting temperature T0 of the fly ash depositing on heat transfer surfaces, the estimating being based on potassium (K) content of the fly ash; measuring or estimating the temperature Tss of superheated steam; evaluating a temperature difference TD1 between the first melting temperature T0 and the temperature Tss of the superheated steam, the temperature difference TD1 providing an estimate of the risk of corrosion; and selecting a control action for influencing the temperature difference TD1. Alternatively or additionally, the method comprises estimating the sticky temperature TSTK of the fly ash depositing on heat transfer surfaces, the estimating being based on potassium (K) and chlorine (Cl) contents of the fly ash; measuring or estimating the temperature TFG of the flue gases; evaluating a temperature difference TD2 between the sticky temperature TSTK and the temperature TFG of the flue gases; the temperature difference TD2 providing an estimate of the risk of plugging; and selecting a control action for influencing the temperature difference TD2.
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公开(公告)号：US20180363900A1
公开(公告)日：2018-12-20
申请号：US15997140
申请日：2018-06-04
Applicant: Valmet Automation Oy
Inventor： Jarmo Mansikkasalo , Jukka Koskinen
Abstract: The method in a recovery boiler comprises estimating the first melting temperature T0 of the fly ash depositing on heat transfer surfaces, the estimating being based on potassium (K) content of the fly ash; measuring or estimating the temperature Tss of superheated steam; evaluating a temperature difference TD1 between the first melting temperature T0 and the temperature Tss of the superheated steam, the temperature difference TD1 providing an estimate of the risk of corrosion; and selecting a control action for influencing the temperature difference TD1. Alternatively or additionally, the method comprises estimating the sticky temperature TSTK of the fly ash depositing on heat transfer surfaces, the estimating being based on potassium (K) and chlorine (Cl) contents of the fly ash; measuring or estimating the temperature TFG of the flue gases; evaluating a temperature difference TD2 between the sticky temperature TSTK and the temperature TFG of the flue gases; the temperature difference TD2 providing an estimate of the risk of plugging; and selecting a control action for influencing the temperature difference TD2.
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公开(公告)号：US12104319B2
公开(公告)日：2024-10-01
申请号：US17888917
申请日：2022-08-16
Applicant: VALMET AUTOMATION OY
Inventor： Jukka Koskinen , Mikko Leskinen , Jarmo Mansikkasalo
CPC classification number: D21C11/12 , D21C11/0007 , D21C11/122 , D21C11/14 , F23G5/50 , F23G7/04 , G01B11/24 , G01J5/0044 , G01N25/04 , G01J2005/0077
Abstract: A method for controlling a chemical recovery boiler. The method includes measuring concentrations of sodium carbonate, sodium sulfide, and sodium sulfate from green liquor of the chemical recovery boiler, determining a target temperature for smelt, imaging at least an area of a char bed of the chemical recovery boiler, the area being close to a smelt spout, to obtain an image of the area, determining a measured temperature of the char bed using the image of the area. The method further includes determining that the measured temperature of the char bed is less than the target temperature for smelt, and controlling the chemical recovery boiler such that the temperature of the char bed increases. A chemical recovery boiler for the same.
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公开(公告)号：US10385513B2
公开(公告)日：2019-08-20
申请号：US15707676
申请日：2017-09-18
Applicant: VALMET AUTOMATION OY
Inventor： Jukka A. Koskinen , Mikko Leskinen , Jarmo Mansikkasalo
Abstract: A method for optimizing reduction and content of total titratable alkali of green liquor of a recovery boiler. The method comprises producing green liquor in a dissolving tank by conveying smelt and weak white liquor into the dissolving tank and measuring at least the contents of sodium sulphate, sodium hydroxide, sodium sulphide, and sodium carbonate of the green liquor. The method comprises controlling at least a process parameter of a recovery boiler to maximize the reduction of the recovery boiler and controlling the flow of the weak white liquor into the dissolving tank to optimize the content of total titratable alkali of the green liquor. In addition, a system for producing green liquor with optimized reduction and content of total titratable alkali. The system comprises a first sensor arrangement, a first and a second regulator, and a processing unit arrangement configured to perform the method.
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