An arrangement for installation of monitoring sensors of a treatment vessel for lignocellulosic material

Patent metadata

Field	Value
Publication number	US-2022018067-A1
Application number	US-201917295596-A
Country	US
Kind code	A1
Filing date	Nov 21, 2019
Priority date	Nov 22, 2018
Publication date	Jan 20, 2022
Grant date	—

Abstract

An arrangement for installations of monitoring sensors of a vessel for treatment of lignocellulosic material, which vessel ( 1 ) has a central pipe ( 2 ) including at least one concentric pipe ( 3 ), mounted coaxially within the vessel ( 1 ). At least one sensor channel ( 4 ) is arranged along the outermost wall of the concentric pipe ( 3 ) of the central pipe ( 2 ) and that the at least one sensor channel ( 4 ) is connected to a cable conduit ( 5 ), which cable conduit ( 5 ) connects the exterior of the vessel ( 1 ) to the at least one sensor channel ( 4 )) and the sensor channel ( 4 ) is several meters long and has plurality of holders ( 13 ) for sensors ( 11 ) and/or is configured to contain plurality of thermal sensors ( 11 ) with their cables ( 8 ).

First claim

1 . An arrangement for installations of monitoring sensors of a vessel configured to treat lignocellulosic material, wherein the vessel includes a central pipe comprising at least one concentric pipe mounted coaxially within the vessel, the arrangement comprising:
at least one sensor channel arranged along an outermost wall of the at least one concentric pipe of the central pipe, and a cable conduit connected to the at least one sensor channel and connected to an exterior of the vessel, wherein the at least one sensor channel is at least one meter long and includes at least one of: (i) a plurality of sensor holders configured to hold sensors is and (ii) a plurality of thermal sensors with cables for the thermal sensors.

2 . The arrangement of claim 1 , wherein an interior of an outer wall of the at least one sensor channel is longitudinally divided into at least two sensor channels, and the outer wall is a concentric pipe attached to an outer wall of the central pipe.

3 . The arrangement of claim 1 , wherein an outer wall of the at least one sensor channel is welded along opposite sides of the outer wall to the central pipe.

4 . The arrangement of claim 1 , wherein the at least one sensor channel includes at least one subchannel.

5 . The arrangement of claim 4 , wherein the at least one subchannel is entirely supported by the outer wall of the at least one sensor channel.

6 . The arrangement of claim 1 , wherein the at least one sensor channel includes a sealed channel connected to a source of pressurized fluid.

7 . The arrangement of claim 6 , wherein the source of the pressurized fluid is connected to a controller configured to determine a leak in the sealed channel.

8 . The arrangement of claim 1 , wherein the at least one sensor channel is at least one of: (i) extends vertically beyond the concentric pipes of the central pipe, and (ii) extends proximate an outlet of an outermost concentric pipe of the at least one concentric pipe.

9 . The arrangement of claim 1 , wherein the cable conduit connects to at least one of a top end and a lower end of the at least one sensor channel.

10 . The arrangement of claim 1 , wherein the cable conduit includes at least one of: (i) a cable tube extending through the cable conduit and into the at least one sensor channel, and (ii) an evacuation tube extending through the cable conduit and to a bottom of the at least one sensor channel.

11 . The arrangement of claim 1 , wherein the sensors include at least one of a temperature sensor, a chip level sensor, a liquid interface sensor, a liquid level sensor, and a residual alkali concentration sensor.

12 . The arrangement of claim 1 , wherein the at least one sensor channel is insulated against thermal conductivity from an outermost wall of the at least one concentric pipe of the central pipe.

13 . The arrangement of claim 11 , wherein the at least one sensor channel is insulated against thermal conductivity from an outermost concentric pipe of the at least one concentric pipe, and the at least one sensor channel includes the thermal sensors which, do not extend out of the at least one sensor channel into an interior of the vessel.

14 . The arrangement of claim 1 , further comprising at least one of: (i) a plurality of sensors of the same type at a same elevation level in the at least one sensor channel, and (ii) at least two sensors of the same type arranged at different elevations in the at least one sensor channel.

15 . A digester vessel oriented vertically and configured to continuously treat a lignocellulosic material, the digester vessel comprising:
an outer wall defining an interior chamber configured to treat the lignocellulosic material flowing continuously down through the digester vessel from an upper inlet to a lower outlet for the material; a central pipe coaxial with the outer vessel and extending at least ten meters within the interior chamber, wherein the central pipe is configured to deliver liquor to the lignocellulosic material in the interior chamber; a sensor channel mounted to an outermost wall of the central pipe and extending at least ten meters in the interior chamber, wherein the sensor channel supports sensors arranged at various elevations within the digester vessel; a cable conduit extending from the sensor channel, through the interior chamber and to an outlet at or external to the outer wall; and at least one sensor cable connected to a respective one of the sensors and extending through the sensor channel and through the cable conduit, wherein the at least one sensor cable is configured to transmit signals generated by the sensors to a processor external to the digester vessel.

16 . The digester vessel of claim 15 , further comprising an sealed channel extending through the cable conduit and the sensor channel, wherein the sealed channel is configured to be pressurized.

17 . The digester vessel of claim 15 , wherein the sensor channel has an outer wall exposed to the lignocellulosic material and is configured to shield the sensors from the lignocellulosic material.

18 . The digester vessel of claim 15 , further comprising an evacuation tube extending from an outlet external to the outer wall and the interior chamber, and extending to at least a bottom of the sensor channel, wherein the evacuation tube is configured to evacuate liquid from the sensor channel and out of the digester vessel.

19 . The digester vessel of claim 15 , wherein the cable conduit and the sensor channel are sealed and configured to isolate an interior channel through the cable conduit and the sensor channel from the lignocellulosic material.

20 . The digester vessel of claim 15 , wherein the sensor channel is concentric with the central pipe and extends around an outermost wall of the central pipe.

Assignees

• Andritz Oy

Inventors

• Muhli Aki
• Suikki Tomi

Classifications

• D21C7/00

  Digesters · CPC title

• D21C3/00

  Pulping cellulose-containing materials (digesters D21C7/00) · CPC title

• D21C7/12 Primary

  Devices for regulating or controlling · CPC title

• D21C3/24

  Continuous processes · CPC title