A ragger system for removing solid debris from a pulper vessel of a pulping system is disclosed. The ragger system includes a ragger operable to pull a tail of solid debris from the pulper vessel. The ragger includes a puller mechanism, a puller drive, a rider roll, and a pressure device to adjust a pressure of the rider roll on the tail between the puller mechanism and the rider roll. The ragger system includes a measurement device for determining attributes of the tail, operating conditions of the pulping system or ragger, or combinations of these. The ragger system includes a control system that measures input variables with the measurement devices, determines the attributes of the tail or operating conditions from the input variables, and adjusts a withdrawal rate, pull direction, pressure, rider roll torque or speed, or combinations thereof to maintain continuity of operation of the ragger.

A ragger system for removing solid debris from a pulper vessel of a pulping system is disclosed. The ragger system includes a ragger operable to pull a tail of solid debris from the pulper vessel. The ragger includes a puller mechanism, a puller drive, a rider roll, and a pressure device to adjust a pressure of the rider roll on the tail between the puller mechanism and the rider roll. The ragger system includes a measurement device for determining attributes of the tail, operating conditions of the pulping system or ragger, or combinations of these. The ragger system includes a control system that measures input variables with the measurement devices, determines the attributes of the tail or operating conditions from the input variables, and adjusts a withdrawal rate, pull direction, pressure, rider roll torque or speed, or combinations thereof to maintain continuity of operation of the ragger.

A method for continuous steam explosion discharge of a pressurised reactor for thermal treatment of lignocellulose biomasses. The steam explosion discharge is complete decoupled from the thermal treatment step and the loss of steam from the process is fully controlled without jeopardizing the mechanical disintegration of the lignocellulose material from the process.

A method for continuous steam explosion discharge of a pressurised reactor for thermal treatment of lignocellulose biomasses. The steam explosion discharge is complete decoupled from the thermal treatment step and the loss of steam from the process is fully controlled without jeopardizing the mechanical disintegration of the lignocellulose material from the process.

A processing liquid is generated by mixing a chemical and water in a processing liquid generation region disposed below an inner tank. By further supplying water to raise a water level, the processing liquid is supplied from below the inner tank. This prevents a used paper diaper from coming into contact with water containing no chemical.

A processing liquid is generated by mixing a chemical and water in a processing liquid generation region disposed below an inner tank. By further supplying water to raise a water level, the processing liquid is supplied from below the inner tank. This prevents a used paper diaper from coming into contact with water containing no chemical.

A feeding arrangement comprising a transportation means (3) for transportation of material from a material supply to at least a first chute (7) and a second chute (8), a plug screw feeder (11) for feeding the material to the treatment stage. The plug screw feeder (11) is provided with a first inlet opening (12) connected to the first chute (7), which first chute (7) is provided between the transportation means (3) and the plug screw feeder (11). Further, the transportation means (3) comprises at least selectively openable first and second outlets (4, 5) arranged at different axial positions along the transportation means (2), which first outlet (4) is in connection with the first chute (7) and the second outlet (5) is in connection with the second chute (8).

A feeding arrangement comprising a transportation means (3) for transportation of material from a material supply to at least a first chute (7) and a second chute (8), a plug screw feeder (11) for feeding the material to the treatment stage. The plug screw feeder (11) is provided with a first inlet opening (12) connected to the first chute (7), which first chute (7) is provided between the transportation means (3) and the plug screw feeder (11). Further, the transportation means (3) comprises at least selectively openable first and second outlets (4, 5) arranged at different axial positions along the transportation means (2), which first outlet (4) is in connection with the first chute (7) and the second outlet (5) is in connection with the second chute (8).

Methods and systems for controlling operation of a smelt dissolving tank receiving a flow of smelt and having a vent stack in fluid communication are provided. A dissolving liquid is injected into the smelt dissolving tank at a predetermined injection rate. A temperature of a flow of vapour in the vent stack is measured with a sensor. The injection rate of the dissolving liquid is controlled based on the temperature of the flow of vapour.

Methods and systems for controlling operation of a smelt dissolving tank receiving a flow of smelt and having a vent stack in fluid communication are provided. A dissolving liquid is injected into the smelt dissolving tank at a predetermined injection rate. A temperature of a flow of vapour in the vent stack is measured with a sensor. The injection rate of the dissolving liquid is controlled based on the temperature of the flow of vapour.