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US 2022/0316799 A1Published application
System for reheating air in dryers
AssigneesCmpc Tissue S.A., Andritz Inc.
InventorsReinaldo Uribe Arancibia, George Z. Nowakowski
Life of this patent
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Abstract
An exemplary process air recirculation system, and an electric heater mixing apparatus is disclosed herein. Exemplary process air recirculation systems comprise the electric heating mixing apparatus. An exemplary electric heating mixing apparatus comprises: walls defining a first chamber having a first upstream opening and a first downstream opening, and a second chamber having a first upstream opening and a first downstream opening, wherein the second chamber is adjacently disposed to the first chamber, a first inlet damper disposed at the first upstream opening, a second inlet damper disposed at the second upstream opening, and a resistance-type electric air heater disposed in the first chamber.
Claims18
A process air recirculation system comprising:
- a dryer for drying lignocellulosic material in a paper making process;
- and
- an electric heater mixing plenum having:
- an upstream end configured to fluidly communicate with a process air outlet conduit, wherein the process air outlet conduit is configured to fluidly communicate with the dryer,
- a downstream end configured to fluidly communicate with a reheated air inlet conduit, wherein the reheated air inlet conduit is configured to fluidly communicate with the dryer,
- walls defining a first chamber having a first upstream opening and a first downstream opening, and a second chamber having a second upstream opening and a second downstream opening, wherein the second chamber is adjacently disposed to the first chamber,
- a first inlet damper disposed at the first upstream opening,
- a second inlet damper disposed at the second upstream opening, and
- a resistance-type electric air heater disposed in the first chamber.
6 more elements
A system comprising:
- a dryer for drying lignocellulosic material in a paper making process;
- an exhaust outlet disposed downstream from the dryer, wherein the dryer fluidly communicates with the exhaust outlet;
- a makeup air inlet disposed downstream from the dryer, wherein the makeup air inlet fluidly communicates with the dryer;
- an electric heater mixing plenum configured to fluidly communicate with the air makeup inlet, wherein the electric heater mixing plenum is disposed downstream of the air makeup inlet, and the electric heater mixing plenum includes:
- an upstream end configured to fluidly communicate with a process air outlet conduit, wherein the process air outlet conduit is configured to fluidly communicate with the dryer,
- a downstream end configured to fluidly communicate with a reheated air inlet conduit, wherein the reheated air inlet conduit is configured to fluidly communicate with the dryer,
- walls defining a first chamber having a first upstream opening and a first downstream opening, and a second chamber having a second upstream opening and a second downstream opening, wherein the second chamber is adjacently disposed to the first chamber,
- a first inlet damper disposed at the first upstream opening,
- a second inlet damper disposed at the second upstream opening, and
- a resistance-type electric air heater disposed in the first chamber;
- and
- a combustion heating system configured to fluidly communicate with the electric heater mixing plenum, wherein the combustion heating system is disposed downstream of the electric heater mixing plenum, and wherein the combustion heating system is disposed upstream of the dryer, thereby completing a circuit.
9 more elements
A system comprising:
- a dryer for drying lignocellulosic material in a paper making process;
- a process air outlet conduit configured to fluidly communicate with the dryer;
- a reheated air inlet conduit configured to fluidly communicate with the dryer;
- an electric heater mixing plenum having:
- an upstream end configured to fluidly communicate with the process air outlet conduit,
- a downstream end configured to fluidly communicate with a reheated air inlet conduit, wherein the downstream end is distally disposed from the upstream end,
- walls defining a first chamber having a first upstream opening and a first downstream opening, and a second chamber having a second upstream opening and a second downstream opening,
- a first inlet damper disposed at the first upstream opening,
- a second inlet damper disposed at the second upstream opening, and
- a resistance-type electric air heater disposed in the first chamber;
- a first sensor disposed in the reheated air inlet conduit;
- a second sensor disposed proximate the first downstream opening;
- a third sensor disposed in the second chamber;
- and
- a fourth sensor disposed proximate to first upstream opening, wherein each of the first sensor, second sensor, third sensor, and fourth sensor is configured to measure a temperature or a pressure of a process air passing any of the first sensor, second sensor, third sensor, or fourth sensor to define a first, second, third, or fourth sensor measurement, and wherein each of the first sensor, second sensor, third sensor, or fourth sensor is configured to transmit the respective sensor measurement to a controller.
12 more elements
Dependencies are inferred from the claim text.