WTT ThermoTreat 2.0 .0 Peter Klaas, Ph.D. Managing Director Wood - - PowerPoint PPT Presentation

▶
wtt thermotreat 2 0 0
SMART_READER_LITE
LIVE PREVIEW

WTT ThermoTreat 2.0 .0 Peter Klaas, Ph.D. Managing Director Wood - - PowerPoint PPT Presentation

Aug 22, 2022 124 likes •398 views

An in intro to WTT ThermoTreat 2.0 .0 Peter Klaas, Ph.D. Managing Director Wood Treatment Technology A/S Agenda Introduction to Wood Treatment Technology A/S (WTT) Introduction to thermo modification technologies The new WTT

slide-1
SLIDE 1

An in intro to

WTT ThermoTreat 2.0 .0

Peter Klaas, Ph.D. Managing Director Wood Treatment Technology A/S

slide-2
SLIDE 2

Agenda

  • Introduction to Wood Treatment Technology A/S (WTT)
  • Introduction to thermo modification technologies
  • The new WTT ThermoTreat 2.0 process
  • The new WTT ExoT process control
  • The 2.0 technology
  • Quality compliance and control
  • Summary
slide-3
SLIDE 3

WTT engineering & manufacturing

Founded in 1978 Owned by Brothers Uhre & Peter Klaas Part of the Eurocon group Bicocide impregnation Vacuum drying Thermo treatment Royal Hot-Oil Ammonia treatment Fully automated 24/7 Special processes

slide-4
SLIDE 4

Unique track record Experienced team Innovative engineering International network ____________________ = Business case certainty

slide-5
SLIDE 5

What is thermal modification?

  • Wood consists of hemicelluloses, cellulose and lignin
  • Hemicelluloses attract water and are available sugars to fungi and

insects

  • Hemicelluloses can be removed by two processes, Pyrolysis and

Hydrolysis

  • Pyrolysis is decomposition by means of high temperature without

presence of oxygen

  • Hydrolysis is decomposition by the addition of water
  • New compounds are formed in the wood in a reaction catalyzed by

acids – hence the brown color

slide-6
SLIDE 6

What is the difference between the open and closed systems?

Open System Closed system Pyrolysis Hydrolysis Atmospheric Pressure, High Temperature High Pressure, Low temperature Wood must be dried – no free water Water needed for hydrolysis – no drying < 12% Long cycle time Short cycle time Higher energy consumption & process emissions Lower energy consumption & process emissions

slide-7
SLIDE 7

The new WTT ThermoTreat 2.0 .0

Patent application no. PA 201670528

slide-8
SLIDE 8

WTT ThermoTreat 2.0 .0 process – whats new?

1st Generation closed system ThermoTreat 2.0 Cycle time (hrs) 24 12/8 Energy consumption (kWh/m3) 205 120 Steam (kg/m3) 15 1.3 Pressure in modification phase (bar) 8 14 Heat transfer coefficient (W/mK) 11 104 Nominal heating capacity (kWh/m3) 44 222 Nominal cooling capacity 35 444 Pressure dynamics Unstable – quality risks Stable – risks eliminated Approximate modification cost (EUR/m3) 70 40

slide-9
SLIDE 9

Im Improved heat transfer capability

0,0 20,0 40,0 60,0 80,0 100,0 120,0 140,0 20 40 60 80 100 120 140 160 180 200 220 Heat transfer coefficent (W/mK) Temperature (Celcius) Watervapour, atmospheric pressure [W/mK] Nitrogen, 10 Bar intial pressure [W/mK]

High heat transfer capability of ThermoTreat 2.0 Low heat transfer capability of open systems and 1st generation closed

slide-10
SLIDE 10

Im Improved heat transfer capability

  • Reduced cycle time due to faster

heating and cooling

  • Constant heating and cooling rates

cause less stress on wood and technology

slide-11
SLIDE 11

Elimination of f steam in the reactor atmosphere

  • Reduced energy consumption
  • Energy not needed for turning water into

steam atmosphere

  • Reduced heat loss from the system due to

shorter cycle times

  • Quality problems from condensates

staining the wood avoided

  • >90 % reduction of condensates virtually

eliminates waste water

  • Improved pressure dynamics…
slide-12
SLIDE 12

… improved pressure dynamics

With steam at elevated temperature, small changes in temperature.. .. causes large changes in pressure

slide-13
SLIDE 13

Im Improved pressure dynamics

0,000 2,000 4,000 6,000 8,000 10,000 12,000 14,000 16,000 18,000 20 40 60 80 100 120 140 160 180 200 220 Pressure (Bar) Temperature (Celcius) Water vapour (85% rm) Nitrogen

  • During the exotherm,

temperature quickly increases to over 200 °C at the wood core

  • With steam, the

atmosphere expands exponentially creating pressure shocks

  • This is eliminated in 2.0
slide-14
SLIDE 14

The new WTT ExoT process control program

Patent application no. PA 2016 70531

slide-15
SLIDE 15

Durability / Strength trade-off

Temperature Durability Strength (MOR) Undertreatment Optimal treatment Overtreatment

Problem:

  • Hemicellulose content

varies significantly between species and even between charges;

  • It is practically

impossible to derive the correct treatment recipe from test trials

slide-16
SLIDE 16

Solution: Exploiting the differential wood component properties

Hemicellulose Cellulose Lignin Hydrolysis/low temp Yes No No Pyrolysis/high temp Yes Yes Yes Exothermic peak in Nitrogen atmosphere (oC) 290 (xylan) 360 320 Hemicellulose Cellulose Lignin Modification effect on durability Very high low low Modification effect on strength Low High High

slide-17
SLIDE 17

The ExoT process control strategy

  • Goal: to remove as much hemicellulose, and

as little cellulose and lignin, as possible to maximize durability increase and minimize strength loss

  • Strategy: Use the hemicellulose exotherm as

process control parameter. When the exotherm is complete, all available hemicelluloses are removed

slide-18
SLIDE 18

WTT ExoT process control

50 100 150 200 250 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 Temperature (Celcius) Time (minutes) Atmosphere temperature Temperature, wood core, spruce, 32 x 100 mm

Start cooling of atmosphere Hemicellulose Exotherm

slide-19
SLIDE 19

The 2.0 .0 Technology

slide-20
SLIDE 20

From small to large volume with standard modules – Plug and Play installation

Suitable both for small volumes with manual operation and large volumes with fully automated, 24/7 operation:

  • Standard Ø 1800 x 11000 24 h cycle: 3,000 m3/year
  • Standard Ø 1800 x 11000 12/8 h cycle: 6-9,000 m3/year
  • Multiple standard modules tied together for volumes > 9,000 m3/year
slide-21
SLIDE 21
slide-22
SLIDE 22

Compliance & & Quality Control

slide-23
SLIDE 23

Compliance & & Quality Control

  • Comprehensive product tests for Scots pine, Norway spruce & Beech
  • EN 113 Durability, lab tests
  • EN 330 Durability, field, with surface coating
  • TS 12037 Durability, field
  • Performed in Q3-Q4 2016
  • Product Data Sheets; Scots pine, Norway spruce & beech
  • Product tests and PDS for other species available on customer demand
  • Quality Management System under NTR available on customer demand
  • Tests and documentation of emissions Q3 2016
slide-24
SLIDE 24

Summary ry overview: key fi figures & points

Open system Closed system First generation 1.0 WTT 2.0 Cycle time (hrs) (use class 3.2) 42 24 12 (8) Total energy consumption (kWh/m3 wood) 600 205 120 Steam (kg/m3 wood) unknown 15 1.3 Energy for steam production (kWh/m3 wood) unknown 11 1 Pressure in modification phase (bar) atmospheric 8 14 Modification temperature ( oC) 230 180 170 Heat transfer coefficient at 100 oC (W/mK) 11.4 (1 bar) 11.4 (1Bar) 101 (10 Bar) Nominal heating capacity (kWh/m3 wood) 25 45 222 Initial cooling capacity (kWh/m3) N/A 35 444 Pressure dynamics N/A unstable stable Process control system Standard recipies Standard recipies ExoT Modification cost incl. depreciation and labour (EUR/m3) (use class 3.2) 80 - 100 70 40

slide-25
SLIDE 25

Thank You for your attention