Front loading drying chambers. Convective drying chambers with front loading of lumber Drying chambers with front loading

This type drying chambers for wood loaded by the transverse movement of p / m stacks using a forklift, i.e. frontally. Placement of equipment in the chamber - on the back wall, or in the classical way above the false ceiling. Axial reversible fans made of corrosion-resistant aluminum alloys serve as inducers of the drying agent circulation. Gate lifting and rolling is mechanized.

The advantage of ourtimber drying chambers :

• Lower cost compared to imported and domestic counterparts!
• You don't have to rack your brains - where to screw which screw, we will do it for you!
• Ease of maintenance and open user architecture of the ACS leave you the right to flexibly regulate the mode of operation of the cameras!

We produce six standard sizes of convective drying chambers with front loading of sawn timber - for 30 m³, 40 m³, 50 m³, 60 m³, 80 m³ and 100 m³ for a single load

The chambers are built according to the classical scheme with vertical-transverse circulation of the drying agent along the stack. The drying chamber is divided in height by a false ceiling into two parts. The stack is formed at the bottom of the chamber, and all major equipment is positioned above the false ceiling. To fix the equipment under the ceiling of the drying chamber, a metal structure is assembled, the main elements of which are trusses, interconnected by ties and braces. The trusses are equipped with axial reversible fans and heat exchangers, as well as a false ceiling. False ceiling serves to organize the movement of air flows inside the chamber. To carry out air exchange with the external environment, supply and exhaust ventilation pipes are built into the roof or into the walls above the false ceiling. The branch pipes are equipped with air valves.

The basis of the design of the front-loading drying chamber is a frame installed on a previously prepared base. The frame is made of aluminum profiles. Elements of internal and external cladding are attached to the frame. Insulation is laid between the skin mineral wool... Insulation - slab. To prevent possible subsidence of the insulation, a crate is equipped on vertical wall fences. The vapor barrier layer allows you to avoid condensation on the outer casing of the chamber and the absorption of this moisture by the insulation, while maintaining its high heat-insulating properties.

In front-loading drying chambers, the loading gates have a considerable length, that is, the length exceeds the length of the stack, therefore, most often they are made lifting and sliding gates. The gates are equipped with roller clamps, a profile silicone seal for sealing the junction with the chamber doorway and hooks for opening the gates. For opening, a special gate release mechanism... On the doorway of the drying chamber, special grips are fixed, which include the roller clamps of the gate. The gate, sagging under its own weight, is tightly and reliably fixed with grips to the doorway. Up-and-down gate mechanism suspended on a monorail mounted above the doorway. The design of the door release mechanism allows you to lift and move a door weighing up to 1200 kg.

The fans used in these drying chambers are reversible, axial, with a cast aluminum impeller. Imported tropicalized electric motors are used as fan drives, insulation class "H", that is, they can be used in rooms with a temperature the environment up to 100 ° C.

As heat exchange equipment in convective drying chambers are used water heat exchangers, the heat transfer elements of which are made of bimetallic finned tubes. The fins are aluminum, rolling, which ensures good contact between it and the supporting pipe, which in turn increases the heat transfer coefficient between the coolant and the environment. The connection of the heat exchangers with the supply and return collectors is flanged. The supply header is equipped with an air removal system, and the return header is equipped with a coolant drain system.

To control the process of drying sawn timber, drying chambers are equipped with automation systems. In the basic configuration drying chambers are equipped with self-produced automatics PSU-TPS (d) based on a domestic controller. At the request of the CUSTOMER, it is possible to complete the cameras with automation based on the controller DELPHI.

Timber drying chamber device

The SKvp drying chamber consists of an all-metal frame insulated with mineral wool basalt sandwich panels 100-120 mm thick, which guarantee normal operation in the range of ambient temperatures from -30 to +40 ºС. The frame of the drying chamber is treated with a heat and moisture resistant Finnish coating. The doors of the drying chamber are lift-and-slide on rhombic supports, they are pressed spontaneously under their own weight. The gates are opened with the help of a removal mechanism, on which a worm winch is installed and rolled to the side by the width of the opening along the I-beam located in the upper part of the frame under the roofing sandwich panels. On the rear wall of the drying chamber there is an inspection door for visual monitoring of the state of the lumber during the drying process in case of need and maintenance or emergency repairs.

The timber drying chamber is equipped with aluminum axial reversible fans, which ensure the blowing of the stack with air at a speed of 2 ... 2.5 m / s and stainless heat exchangers designed to heat the air. The equipment is located in the upper part of the body and closed from below by a false ceiling with gaps up to the inner surfaces of the rear wall and the door by 1000 ... 1200 mm, which ensures good blowing of the stack. On the rear and front walls above the door, there are 2 electrically operated aluminum air dampers for automatic discharge of excessively humid air from the drying chamber. The supply line is equipped with a 3-way motorized valve for automatic flow control hot water into heat exchangers. Air and 3-way valves provide the required climate in the drying chamber, namely the temperature and humidity set by the operator using the program at each stage of drying the sawn timber.

Temperature, air humidity and wood moisture during the drying process are measured using sensors installed on the rear and side walls inside the drying chamber. The entire drying process is controlled by an automatic control system based on the advanced Italian new generation LITouch or dTOUCH controllers.

Technical characteristics of SKvp series drying chambers

2. Standard complete set of one chamber 75 m 3:

Fans.

Aluminum heat and moisture resistant reversible fans (engineSiemens) , in the amount of 4 pieces.

Fan power 4 kW. The degree of protection of fan motors is IP 55 (GOST 14254-96), thermally protected version according to insulation class "H" (GOST 8865-93).

The fans are grouped on an aluminum fan wall and positioned above the false ceiling. Fan blades - cast aluminum, dynamically balanced, shells are made of aluminum alloys.

With optional installation electronic control systems fan rotation speed control of rotation frequency can be performed depending on the current moisture content of the wood: 10 steps, min. power - 20% of the nominal.

Air heaters.

Bimetallic heaters of KNSk type with aluminum fins. The heat transfer surface made of aluminum and the tight contact of the two materials provide high heat specifications heaters.

When drying hardwood sawn timber that forms a sharply aggressive environment (oak, larch), it is recommended to install stainless steel heaters.

Automation and power cabinet.

Under the control of aautomaticallyOhsystemsNScontroller basedLiTOUCH.

LITouch is a natural development of the well-proven controller for DELPHI drying kilns. The automation combines ease of operation with a graphic touch screen display, and is especially suitable for users who require simple and complete control over the system, using both standard and their own drying programs.

Along with ease of maintenance, the automation allows you to independently create complex drying cycles, including up to 30 stages. The operator can set priority conditions for the end of each drying phase, as well as select drive control modes. By default, the LITouch controller contains more than 80 drying programs that can be used independently or as a template to create your own.

The sensor signal amplifier is housed in a separate aluminum housing (IP65). In this regard, the control panel with the controller can be located at a sufficient distance from the drying chamber (up to 1000 m).

Specifications:

Temperature measurement range in the chamber: 0 ... 130 ° C

Wood moisture measurement range: 4 ... 90%

Measurement range of equilibrium moisture content: 2 ... 30%

Number of temperature sensors: 2 (standard)

Number of wood moisture sensors: 6 (standard)

Number of EMC sensors: 2 (standard)

For remote control (range up to 1200 m) using a personal computer, software can be used WoodWizardversion2.0 (supplied optionally with a matching unit), which combined all best qualities previous versions and new functionality.

It is also possible to combine up to 32 controllers of drying chambers into a single network through a personal computer with remote access to the computer that controls the drying process.

Controller LiTOUCH easy to operate, has the ability to obtain a detailed report of the drying process in print (including alarms). The controller's protective function allows only authorized personnel to make changes to the program.

All the actuators responsible for maintaining the technological process are connected to the power electrical cabinet. Switches on the front panel of the cabinet allow (if necessary) to switch over to manual control of all equipment of the drying chamber during maintenance and repair work.

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Option: Automatic control system based on controller dTOUCH.

dTOUCH is developed based on Delphi and has the same specifications. In addition to all the implemented functions in DELPHI, dTOUCH includes a wider range of drying programs for more than 400 types of wood, including some special cycles for maintaining / changing the natural color of wood, for quick drying, and so on. Distinctive feature dTOUCH- management through touch screen with the ability to connect wireless sensors to control the wood drying process. Download and transfer of control programs using microSD memory.

Frame and structure of the walls.

The building frame is a metal structure made entirely of aluminum profiles... An inspection door is installed in the rear wall of the chamber.

The structure of the walls is cassette, internal and external cladding - profiled sheet of aluminum alloy .

Mineral slabs are used as insulation PAROC, based on basalt fiber with mixed fiber orientation. The thickness of the panel is 125 mm (at the request of the customer, the thickness of the panels can be changed).

Insulation is laid in 2 layers, which allows you to minimize the area of ​​thermal bridges.

Wall structure consisting of horizontal cassettes with a slab height of 850 mm guarantees the absence of insulation subsidence during the entire period of operation.

The structure of the fiber does not contain any volatile compounds, so its thermal insulation properties remain unchanged for decades. Basalt fiber has good water-repellent properties; under normal operating conditions, the amount of moisture in the specific volume is less than 0.5%.

Thermal resistance coefficient of fences 5.45 m 2 х о С / W subject to operation B according to SNiP 23-02-2003.

The thermal conductivity coefficient of mineral wool is not more than 0.033 W / (mx ºС).

A drainage channel is provided in the floor of the chamber.

Defrost protection- in automatic mode, the chamber maintains a temperature of at least 5 ° C; during a long stop, it is possible to drain water from the heating system and from each heater.

Lift-and-slide gate and gate lifting mechanism.

The gate is made of the same materials as the walls of the drying chamber. The gate is opened and closed by a special mechanism. The movement of the mechanism with the gate is carried out along the overhead track. The tight fit of the doors is carried out due to the own weight of the doors, which are lowered by the mechanism onto special guides.

The silicone rubber profile provides high-quality insulation of the chamber space from the external environment (silicone rubber is an excellent insulating material in terms of its performance, it can withstand frost without hardening to t = -50 ºС; silicone has excellent reversible properties, withstands high humidity, pressure, steam, action various chemicals and oils; resistant to solar radiation, ozone and has electrical insulating properties). Maximum working temperature t = + 150 ºС.

Supply and exhaust ventilation system.

The supply and exhaust ventilation system includes insulated boxes, aluminum dampers (dampers), in the amount of 4 pieces and 2 actuators (Switzerland).

A set of aprons.

Purpose - rational distribution of the flow of the drying agent.

Three-way valve for heating system.

Three-way valve for air heater (Siemens) cast iron, stainless steel valve stem. The valve is equipped with an electronically controlled electric actuator (Siemens). The maximum permissible operating temperature is t = 130 ° C. The nominal diameter of the three-way valve is DN 80.

False ceiling, deflector, fan wall.

The false ceiling, deflector and fan wall are made of corrosion-resistant aluminum grades... The main purpose of the metal structures of the internal equipment is to create a channel for the movement of a drying agent and a hinge of fans and air heaters.

To facilitate access to the equipment during routine maintenance and inspections, the false ceiling panels are made easily removable.

Hardware.

All fixtures in the chamber (bolts, nuts, screws, etc.) are made stainless steel, rivets - aluminum.

Humidification system.

The humidification system includes copper pipes, fittings, nozzles, a solenoid valve Du12. An autonomous water supply system and a fine water filter are optionally supplied.

Set of cables.

The set of cables ensures the location of the control cabinet in the room at a distance of up to 5 meters from the drying chamber.

Drying chamber SK-60

Loading lumber into the front-loading drying chamber can be carried out in two main ways: in the form of packages, stacked with a forklift, and in the form of stacks, manually stacked inside the working space of the drying chamber.

The first method is traditionally used for large volumes of material to be dried, and the second for very small load volumes.

Front-loading drying chambers in comparison with longitudinal loading chambers are characterized by a number of positive features:

• 1. Lack of track in front of the drying chamber;
• 2. The use of a unified lifting and transport mechanism - a fork lift truck;
• 3. Significant easing of working conditions for lumber stackers and, accordingly, an increase in their labor productivity;
• 4. Uniform stacking of packages of lumber in the drying chamber and in the warehouses of dry and raw lumber.

In the mass series, FRONT-loading drying chambers have a loading volume starting from 40 m3.

Vertical circulation

Distinctive features of this type of drying chambers

• - technological equipment is installed in a vertical plane in relation to the dried sawn timber;
• - the vertical circulation of the drying agent through the stacks of dried sawn timber allows high-quality drying of large volumes of sawn timber;
• - large volumes of loading are able to provide the required amount of lumber for any need for dry lumber;
• - batch loading of sawn timber into the drying chamber is carried out by a forklift truck. Due to the preliminary stacking of sawn timber in packages, the duration of the "loading-unloading" operation takes minimal time
• - the possibility of passing through the drying chambers

The composition of the main technological equipment

• - axial fans with motors on outboard shafts;
• - bimetallic heat exchangers;
• - humidification system;
• - supply and exhaust duct system;

Drying process automation system

To control the process in the drying chamber, it is possible to install an automation system of various levels of complexity:

• - the first level of automation (A1)
• - the second level of automation (A2)
• - the third, full level of automation (A3)

Design and engineering documentation

Design documentation is available on request for the construction of drying chamber fences.

Heat supply

Drying chamber SK-60

Technical characteristics of the SK-60 drying chamber

Parameter Value

Chamber capacity, m 3, standard mat. 60

Productivity, conventional m3 / year: 4000

Number of bags in the chamber, pcs 15

The size of the bags loaded into the chamber, mm

width 1200

height 1100

Overall dimensions of the chamber, m:

width 8300

height 6200

Installed electric power, kW 22.5

Required thermal power, Gcal: 0.3

Location of the main elements of the SK-60 drying chamber

The main equipment of the SK-60 drying chamber consists of the following elements:

Fan

The circulating equipment is an axial, reversible fan with an electric motor on an external shaft. In this case, an ordinary electric motor is used. At the request of the customer, it is possible to use fans with motors for placement in the drying space of the chamber. When installing fans with an impeller on the shaft of an electric motor, inside the drying chambers, motors of tropical design are used, with protection class "H".

Heat exchangers

Water, steam bimetallic heat exchangers (material - steel tube, with aluminum fins), electric heaters, hot air can be used as heating equipment. In the latter case, an air heater is used. Also, at the request of the customer, it is possible to install copper-aluminum water heat exchangers.

Supply and exhaust ventilation

Supply and exhaust ventilation is made of carbon steel or aluminum.

Humidification system

The humidification system consists of a spray system and a water distribution unit.

Accessories - Door block

The door block consists of a door frame and a door leaf. Material: frame - carbon steel, doors - carbon steel or sandwich panel.

Lifting and retracting device

Designed for lifting and moving the gate to the side, for loading and unloading the drying chamber

Steel structures

They are a prerequisite for the installation of all technological equipment. They consist of electric motor frames, fan supports, fan screens, upper protective screen, heat exchanger racks. Made of carbon steel. Drawings for the manufacture of metal structures are included in the design documentation.

Service equipment

Drying process control unit

Depending on the level of the automation system, it is used to control the drying process.

Psychrometric unit

Serves to measure the parameters of the drying agent inside the chamber. Made of stainless steel. Temperature sensors are installed directly on it.

Fan control cabinet

Serves to control fan drives

Heat control unit

It is a bypass with an actuator on the main line.

Layout of SK-60 drying chambers in blocks

With large volumes of processing of dry sawn timber, the possibility of arranging drying chambers of this type into blocks should be used.

The number of drying chambers in the block is determined taking into account the annual demand for sawn timber.