EuropeAid/135715/IH/SUP/TR Lot 4

4.1

Conventional Heat-and-Vent Air Circulating Wood Drying Kiln, Capacity:15 m3, combined with indirect heating system (via hot water) and Process Control System.  – Quantity:1

4.1.1

Manufacturer’s name; product model/type:

4.1.2

Country of origin:

4.1.3

Drying method:  Heat-and-vent dry kiln (conventional / convective drying)

4.1.4

Overall drying capacity: 255-340 m³/annum (100 %)

4.1.5

Kiln Timber drying specifications

• Initial mc ≈ 60 %   (based on o.d.w.)
• Final mc= 10 %
• Timber thickness = 40 … 80 … 100 mm,         average thickness = 60…80…100 mm

4.1.6

Loading / unloading the kiln by forklift

4.1.7

Kiln outside measures:
L X W X H min. 6 X 4.5 X 4 Meters

4.1.8

Kiln Construction / Housing

4.1.8.1

• Load-bearing structure: aluminium profiles, fixed on concrete foundations.

4.1.8.2

• Inside skin: aluminium sheets, permanent / durable sealing between the sheet-elements (waterproofed - steam tight wall system!)

4.1.8.3

• Insulation wall/ceiling: mineral wool insulation,min: 100-150 mm

4.1.8.4

• Outside skin: corrugated aluminium sheet (trapezoid or similar). Second roof protecting the kiln from outside, without additional insulation 

4.1.8.5

Doors: exactly same insulation as kiln housing 

• Main door: swinging door or lifting-sliding door
• Emergency exit on the backside

4.1.9

Kiln Fans:

4.1.9.1

Axial fans will be above kiln load and inter­me­diate ceiling.

4.1.9.2

Reversible air flow, fan speed control will be adjustable speed via process control system, continuously with frequency controller

4.1.9.3

Electric power supply approx. 0,25- 0,35 kW/m³ wood, all together approx.  4 – 6 kW

4.1.9.4

Air velocity through timber stacks 1,5 -3 m/s

4.1.9.5

Noise emissions: according to local standards and rules

4.1.10

Heating technique of the kiln  

4.1.10.1

Heating technique: indirect heating via hot water circulationg through heat exchangers inside the kiln

4.1.10.2

Central  Boiler shared jointly for heating of water inside the boiler, circulating water from boiler to heat exchan­gers inside the kiln and thus heating up the air inside the kiln (indirect heating system)

4.1.10.3

Boiler regulation/control via central computer control system (recommended)

4.1.11

Humidity Control in the Kiln:

4.1.11.1

Cold water spraying (min. pressure required) incl. ON/OFF solenoid valve

4.1.11.2

Water treatment system: water-decalcification

4.1.11.3

Required water flow mW = 4 kg/(h·m³wood) à up to 60 kg/h

4.1.11.4

Proportional adjustable flaps / vents for air inlet / out­let (motor driven)

4.1.12

Heat exchangers inside the kiln: The heat exchangers (heating coils and their overall size respectively) have to be adopted to the required heat capacity mentioned under 1.2.1

4.1.12.1

Heating capacity min: 150.000 kcal/h

4.1.12.2

Hot air flow:11.000-12.000 m³/h
(for indirect heating systems achieved by the fans inside the kiln)

4.1.12.3

Adjustable temp. range:  40°C … 100°C

4.1.12.4

Energy source: coal and  wood waste  

4.1.12.5

Guarantee on material and functionality for 2 years

4.1.12.6

For species with high density, slow drying process, required heating power installation approx. 2 … 4 kW/m³ wood for the drying process. Flow tempera­ture up to 80°C à approx.  30 – 60 kW (≈ 25,8 – 51,6 Mcal)

4.1.12.7

For species with normal density and normal drying process, required heating power installation approx. 12 … 16 kW/m³ wood for the heating-up phase of the drying process. Flow temperature up to 60°C à approx.  180 – 240 kW (≈ 154,7 – 206,4 Mcal)

4.1.13

Process Control System Quantity: 1

4.1.13.1

Dedicated computer based Process Control System allow­ing flexible, individual process control of the kiln according to entered drying schedules.

4.1.13.2

Sensors:
Two temperature sensors (at both sides of the stack),
Two humidity sensors (at both sides of the stack)
2 - 4 mc-sensors (to be attached to the boards).

4.1.13.3

The drying parameters / process are controled via a central /main computer system connected to the local controlling units at each kiln & boiler.

4.1.13.4

Separate control room for main computer, the switch boxes (central elecricity supply) and central water supply (for humidification of flue gases feed into the kilns) – located at a suitable place on the site (recommended).

4.2

Conventional Heat-and-Vent Air Circulating Wood Drying Kiln, Capacity: 60 m3, combined with indirect heating system (via hot water) and Process Control Systems.  – Quantity: 2

4.2.1

Manufacturer’s name; product model/type:

4.2.2

Country of origin:

4.2.3

Drying method:  Heat-and-vent dry kiln (conventional drying)

4.2.4

Overall drying capacity: 1.870 – 2.040 m³/annum (100 %)

4.2.5

Kilns’ Timber drying specifications

• Initial mc ≈ 60 %   (based on o.d.w.)
• Final mc= 10 %
• Timber thickness = 40 … 80 … 100 mm, average value = 60…80…100 mm

4.2.6

Loading / unloading the kilns by forklift

4.2.7

Kilns’ ouside measures:
L X W X H min.7.50 X 8.70 X 5 meters 

4.2.8

Kilns’ Construction / Housing

4.2.8.1

Load-bearing structure: aluminium profiles, fixed on concrete foundations.

4.2.8.2

Inside skin: aluminium sheets, permanent / durable sealing between the sheet-elements (waterproofed - steam tight wall system!)

4.2.8.3

Insulation wall/ceiling: mineral wool insulation, min: 100-150 mm

4.2.8.4

Outside skin: corrugated aluminium sheet (trapezoid or similar) Second roof protecting the kiln from outside, without additional insulation 

4.2.8.5

Doors: exactly same insulation as kiln housing 

• Main door: swinging door or lifting-sliding door, sufficiently insulated
• Emergency exit on the backside

4.2.9

Kilns’ Fans:

4.2.9.1

Axial fans will be above kiln load and inter­me­diate ceiling.

4.2.9.2

Reversible air flow, fan speed control will be adjustable speed via process control system, continuously with frequency controller

4.2.9.3

Electric power supply approx. 0,25- 0,35 kW/m³ wood, all together approx. 15 – 25  kW

4.2.9.4

Air velocity through timber stacks 1,5 -3 m/s

4.2.9.5

Noise emissions: according to local standards and rules

4.2.9.6

Axial fans will be above kiln load and inter­me­diate ceiling.

4.2.10

Heating technique of the kilns 

4.2.10.1

Heating technique: indirect heating via hot water circulationg through heat exchangers inside the kiln

4.2.10.2

Central  Boiler shared jointly for heating of water inside the boiler, circulating water from boiler to heat exchangers inside the kiln and thus heating up the air inside the kiln (indirect heating system)

4.2.10.3

Boiler regulation/control via central computer control system (recommended)

4.2.11

Humidity  Control in the kilns:

4.2.11.1

Cold water spraying (min. pressure required) incl. ON/OFF solenoid valve

4.2.11.2

Water treatment system (water-decalcification if re­quired, information on local water quality available from ABIGEM)

4.2.11.3

Required water flow mW = 4 kg/(h·m³wood) à up to 240 kg/h

4.2.11.4

Proportional adjustable flaps / vents for air inlet / out­let (motor driven)

4.2.12

Heat exchangers inside the kiln:

4.2.12.1

The heat exchangers (heating coils and their overall size respectively) have to be adopted to the required heat capacity mentioned under 4.2.1

4.2.12.2

Heating capacity  min: 250.000 kcal/h

4.2.12.3

Hot air flow:  20.000-24.000 m³/h
(for indirect heating systems achieved by the fans inside the kiln)

4.2.12.4

Adjustable temp. range:  40°C … 100°C

4.2.12.5

Energy source: coal and wood waste  

4.2.12.6

Guarantee on material and functionality for 2 years

4.2.12.7

For species with high density, slow drying process, required heating power installation approx. 2 … 4 kW/m³ wood for the drying process. Flow temperature up to 80°C à approx.  30 – 60 kW (≈ 25,8 – 51,6 Mcal)

4.2.12.8

For species with normal density and normal drying process, required heating power installation approx. 12 … 16 kW/m³ wood for the heating-up phase of the drying process. Flow temperature up to 60°C à approx.  180 – 240 kW (≈ 154,7 – 206,4 Mcal)

4.2.13

Process Control System Quantity: 2

4.2.13.1

Dedicated computer based Process Control Systems allow­ing flexible, individual process control of each kiln according to entered drying schedules.

4.2.13.2

Sensors:
Two temperature sensors (at both sides of the stack),
Two humidity sensors (at both sides of the stack),
6 - 8 mc-sensors (to be attached to the boards).

4.2.13.3

Connected to the same main/central computer system mentioned in 1.12.3 and 1.12.4

Pre-condition

Indirect heating of all three kilns requires just one boiler for heating up hot water circulating through all three kilns. For calculating the required heat capacity it is assumed that one kiln is in the heating up phase with max. heat demand whereas the other two kilns are in the drying phase with just about 25 % of the max. heat demand. This leads to a max. heat demand of approx.. 350.000 kcal/h  (= 1∙ 250.000 + 1∙ 250.000 ∙ 0,25 + 1∙ 150.000 ∙ 0,25).

4.3

Hot water boiler Capacity– Quantity: 1

4.3.1

Manufacturer’s name; product model/type:

4.3.2

Country of origin:

4.3.3

Capacity  min: 350.000 kcal/h

4.3.4

Hot water flow through all three kilns, controlled via motor-driven valves

4.3.5

Adjustable temp. range:  40°C … 100°C

4.3.6

Energy source / fuel: coal and wood waste  

4.3.7

Boiler operation control system:  The proper boiler operation has to be continuously regulated and supervised by a suitable controlling unit, e.g. based on a SPS-unit or similar computer regulation system

4.3.8

Guarantee on material and functionality for 2 years