Method and device for thermal processing of wood in the high-speed circulation of products of combustion of gas fuel and additional load at stack

FIELD: wood industry.

SUBSTANCE: method is carried out by: burning gas fuels - natural or liquefied gas with gas burners in a furnace with an open combustion chamber located inside the wood drying chamber, high-speed circulation of the drying agent - a mixture of gas combustion products with water vapour over the stack, continuous measurement by electronic temperature sensors "t" and relative humidity "ϕ" the gaseous medium, the automatic maintenance of the temperature"t"of the gaseous medium as a function of humidity "ϕ" when drying and as a function of time τto6p at heat treatment, which are selected from the developed table of drying regimes for the rock data and the thickness of the assortment and the time of the heat treatment process, the forced loading of the timber in the stack and the exclusion of outside air inside the chamber when the process is stopped. The device for drying and heat treatment of wood contains two axial marching fans, a gas furnace with an open combustion chamber, an automatic process control system, a reinforced concrete slab or a set of spring ties, a folding rails section, external stationary rails, a pallet truck and a U-shaped exhaust pipe.

EFFECT: improving the quality of drying and heat treatment of wood, reducing the percentage of rejects of finished products.

2 cl, 11 dwg, 2 tbl

 



 

Same patents:

FIELD: heating, drying.

SUBSTANCE: invention refers to accelerated drying of different kinds and cross sections of timber by means of equipment providing moisture transfer by action of relatively high temperatures, moisture content and alternating-sign pressure. A method for timber drying in a chamber isolated from atmosphere involves heating of a drying agent by means of heating devices connected in upper part of a shell as per a parallel scheme to main pipelines, devices for heating and circulation of high-temperature liquid heat carrier, reversible fans and flow dividers, which provide flow and distribution of the drying agent along a pile through diffuser channels, each of which is symmetrical to rows of gaskets of the pile, moisture levelling along the timber cross section by a moistening system with further exposure, removal of the drying agent from the chamber to a condensation device and control of a technological process by means of pressure, temperature and humidity control devices. A new feature of the proposed invention is that timber heat treatment is performed by hot recirculating water till average temperature of 35-45°C is achieved, which softens it, equalises humidity and quickly unfreezes it during winter season, by filling the chamber to upper pile level by means of an additionally introduced pipeline circuit provided with possibility of water return or transfer to the next chamber, and the heating process is continued by a steam-and-air drying agent till evaporation temperature is 100 to 120°C, thus maintaining the pressure of up to 1000 mm Hg; with that, the steam-and-air drying agent is removed from timber depending on timber type by constant or periodic vacuum pulses with further vacuum treatment by a vacuum pump till the pressure in the drying chamber is 100 to 150 mm Hg.

EFFECT: drying by evaporation at alternating-sign pressures of 1000 to 100 mm Hg using constant or periodic vacuum pulses considerably accelerates moisture evaporation speed and provides fault-free drying at inconsiderable change of bending, tensile and compression strength.

4 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to high-frequency processing of roller bearing polyamide cage. Proposed method comprises embracing the part by high-potential and earthed electrodes of operating capacitor connected to high-frequency generator and applying pressure thereto. Note here that said part is embraced over top, bottom and inner side surfaces of plates to create spatial circuit 2×n of operating capacitors and simultaneously, connection to generator is made. This makes the potential difference between top high-potential plate and electrodes connected via bottom contact group to bottom earthed plate and bottom earthed plate and electrodes connected via top contact group to top high-potential plate. Heating is performed to polyamide recrystallisation start temperature. Then, generator is switched off on turning the part about its axis by one electrode to heat unprocessed surfaces.

EFFECT: recovery of durability of bearing cage made of polyamide.

6 cl, 3 dwg, 1 tbl, 1 ex

FIELD: agriculture.

SUBSTANCE: method of drying water-containing mass, such as manure, to obtain one final dry product, includes conditioning the air flow to give it the ability to take moisture, creation of the boundary line of mass/air flow to provide the ability to take using the air flow on the specified boundary line, moisture of the water-containing mass, thereby drying it, in which the air flow is heated; the water-containing mass is fed from the reservoir to the separator; the water-containing mass is separated into the fraction with a relatively high content of solids and to the liquid fraction; the fraction with a relatively high content of solids is used for creation of the first static boundary line of mass/air flow; the liquid fraction is used for creation of the second dynamic boundary line of mass/air flow; the air flow is fed to the first static boundary line of mass/air flow to dry the fraction of the water-containing mass with a relatively high content of solids, and then the air flow is fed to the second dynamic boundary line of mass/air flow for preliminary drying the liquid fraction of the water-containing mass; the preliminary dried liquid fraction is fed back into the reservoir; and the preliminary dried liquid fraction is mixed with the water-containing mass in the reservoir; and the dried mass at regular intervals of time is released from the bottom of the first static boundary line of mass/air flow, and the wet mass is added on top of this boundary. The system for drying a water-containing mass, such as manure, comprises a reservoir for water-containing mass, a fan to create air flow; air heating means for conditioning the said air flow; the boundary line of the mass/air flow provided with a reservoir for placing the water-containing mass and providing passing the conditioned air flow through the reservoir for giving the opportunity to the air flow to take moisture from the said mass, at that the system also comprises a pipe for directing the water-containing mass from the reservoir to the separator, the separator for separating the water-containing mass to the liquid fraction substantially free of solids, and to the fraction with a relatively high content of solids; the pipeline to transport the fraction with a relatively high content of solids into the press; the pipeline to transport the fraction with a relatively high content of solids from the press to the first static boundary line of mass/air flow; the press for forming the fraction with a relatively high content of solids; the first static boundary line of mass/air flow for drying the formed fraction of water-containing mass with a relatively high content of solids; the pipeline for supplying the liquid fraction from the separator to the second dynamic boundary line of mass/air flow; the second dynamic boundary line of mass/air flow provided along the process operation after the first static boundary line of mass/air flow for preliminary drying of the liquid fraction of water-containing mass; and the pipeline for supplying the preliminary dried liquid fraction back into the reservoir.

EFFECT: invention enables to obtain dry manure from water-containing mass in operation of the pig farm.

24 cl, 5 dwg

FIELD: machine building.

SUBSTANCE: proposed drier comprises frame, support with V-like seats 3, 4, clamping mechanisms made up of two-arm levers pivoted to said frame and coupled with drive, pick-and-place mechanism made up of levers pivoted on crosswise axles. Top arms of levers represent inclined plate 9 with slope toward unloading side, and thrust 11. Bottom arms of levers are jointed with drive 12 via tie rod 13. Air is fed by fan via heater and nozzles. Proposed method comprises placing tubes in V-like seats, and heating by hot air feed via tubes. Besides, it includes extracting tubes from said seats by pick-and-place device to roll them over on inclined plate so that first tube rolls against the stop on said plate after heating. Then said device displaces to second line of seat. Second tube comes in second line of seats. After drying two tubes pick-and-place device is lifted. First tube goes to unloading. Second tube rolls over against the stop. Then, with said device lowering, second tube comes into second line of seats while third tube gets into first line of seats. Note here that tubes make in rolling, at least, one turnover. While fluid left in tube after first drying cycle is distributed in thin layer over entire inner perimetre of the tube to be finally removed at the nest drying cycle.

EFFECT: higher efficiency.

4 cl, 3 dwg

FIELD: machine building.

SUBSTANCE: built-in elements are arranged inside drum 5 revolving about its central axis to mix and transfer loose material in blowing tempering fluid from drum inlet to outlet. Proposed invention consists in that several thrust rings 7 are arranged between said built-in elements and drum to take up static load and compensate for compression and extension stresses and jointed with said elements and/or their frames 14 and drum 5 with geometrical closure. Method of making drum 5 or drum segment for loose material drier consists in placing several thrust rings 7 to be arranged between said built-in elements and drum to take up static load and compensate for compression and extension stresses and jointed with said elements and/or their frames 14 and drum 5 with geometrical closure, Said built-in elements are mounted two support frames 14. Aforesaid thrust rings 7 are mounted on all sides of built-in element modules, directed outward. Built-in element module with elastic thrust rings 7 is fitted inside drum 5 or drum segment and locked therein by wedges or welding. Said rings are jointed with drum or drum segment with geometrical closure.

EFFECT: simplified design, lower costs.

16 cl, 5 dwg

FIELD: power engineering.

SUBSTANCE: drier comprises a chamber of a multimode resonator, fixed on stands as capable of rotation with the help of a rotation device, made of two truncated cones of different height and a cylindrical part connecting them to each other by larger bases, a rotary vacuum-tight coupling with a waveguide input of microwave energy, a device for chamber blowing with an air line and a device for pumping of chamber volume with a dielectric nozzle installed via a rotary vacuum seal at the side of the chamber bottom along its axis near the bottom plane and bent upwards relative to a horizontal base of a device for drying, in accordance with the invention, a drier comprises a horn antenna installed between a rotary vacuum-tight coupling and a truncated cone larger in height, the horn of which at the outlet is closed with a radiolucent partition with a through hole in the centre, contactless position sensors installed on stands near a horn antenna, at the same time the chamber is fixed on stands at the angle 8-10° relative to the horizontal base. Besides, in the cylindrical part of the chamber there is a loading hatch with a cover and a vacuum and microwave seal, the ratio of heights of a higher truncated cone, a cylindrical part and a lower truncated cone makes 0.75:1:0.5, and the angle between the height and the generatrix of the higher cone makes 8-10°. An air duct of a device for chamber blowing is introduced into a cavity of the antenna horn near a plane of a radiolucent partition. To improve operational characteristics of a device, possibility of monitoring drying process, there are strain sensors installed on stands, on the inner surface of the chamber there are temperature sensors installed, a device for pumping chamber volume includes the following components serially installed into a vacuum line - a pressure metre, an air cleaning filter and the second pressure metre.

EFFECT: higher productivity of a drier for loose dielectric materials with provision of high quality of a dried material and reduced energy intensity of a drying process.

11 cl, 1 dwg

FIELD: wood working industry.

SUBSTANCE: in method of wood veneer preparation for drying during its displacement and simultaneous exposure to mechanical load, application of unidirectional modulated ultrasonic oscillations with development of thermal field gradient simultaneously with intensive heating of a veneer sheet at one side, at the same time veneer is cooled at the other side by supply of a cold agent to the lower feeding roller (for instance, water or intensive flow of cooled air).

EFFECT: increased efficiency of moisture removal process with other equal conditions as a result of thermal field gradient increase.

FIELD: machine building.

SUBSTANCE: procedure for drying consists of several stages when pressure in leak-proof chamber is built to specified level by at least introduction of saturated steam and by maintaining this pressure during specified period of time. Sediment is loaded into a reservoir. The reservoir is positioned at a certain distance from internal walls of the chamber. Sediment is loaded with loading pressure maintaining devices. Superheated steam is introduced into sediment with a mixer. During operation the mixer is positioned near the wall of the reservoir most distanced from a micro-waves source. The mixer includes steam supplying facilities. When sediment is mixed, its central zone is heated with radiation of micro-waves of frequency from 400 to 2450 MHz in the direction of the reservoir. Water collected at condensation and pouring along walls of the chamber to the base of the chamber is removed by means of a valve leading outside. The device consists of the chamber including the leak-proof reservoir resistant to pressure and communicating with at least one generator of micro-waves through at least one orifice out of crystal quartz or any other material suitable for operation with micro-waves. The said chamber is communicated with the generator of saturated steam and with the input of sediment subjected to drying. The chamber is equipped with the mixer consisting of facilities for superheated steam supply. The facilities are arranged in the said chamber. The chamber has a door for dried sediment unloading.

EFFECT: optimised sediment drying without hazard of explosion; complete and fast sediment drying and reduced power consumption.

22 cl, 3 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to wood working, particularly to production of acetylated wood for sleepers. Proposed method comprises simultaneous drying, impregnating and compacting the wood in oily preservative. Note that during all cycles wood is subjected to pulsed ultrasound 20 kHz- 4 kW-field with ultrasound 2.5-3 min-wide pulses alternating with 6-6.5 min-long pauses.

EFFECT: stable dimensions of acetylated wood for sleepers.

1 tbl, 2 ex

FIELD: heating systems, drying.

SUBSTANCE: invention refers to gas supply via main gas line and can be used when constructing main gas lines after hydraulic pressure tests are completed in order to dry them. Method is differed by the fact that in order to increase drying effectiveness, first, gas line is vacuumised till the specified pressure is reached, and is divided with cutoff valves into sections independent of each other. The first section is filled up with nitrogen-based inert gas, thus forming receiver; drying of the next gas line section after receiver and being under pressure is performed from receiver with nitrogen-based inert gas till specified values of humidity, pressure and concentration of nitrogen are obtained, and receiver is supplied with recirculating nitrogen obtained by separation of inert gas saturated with water vapours into nitrogen, oxygen, water and removal of oxygen and water from polymeric hollow fibre membranes. At that, inert gas saturated with water vapours to membrane is removed from the gas line section after receiver. Drying is stopped after specified values of humidity, pressure and concentration of nitrogen are obtained in the whole volume of the cavity of dried gas line.

EFFECT: invention must increase drying effectiveness of gas line cavity after hydraulic pressure tests are completed.

3 cl, 1 dwg

FIELD: woodworking industry.

SUBSTANCE: drying method of sawn timber in convective drying chambers provides for the maintenance of specified parameters of a circulating drying agent. For that purpose, the floor temperature of the drying chambers is equalised to the temperature of side and ceiling structures of the drying chambers by using some part of hot water wasted in heating units of the drying chambers. And a floor heating device is made in the form of a coil of a metal-reinforced plastic pipe and installed under the floor of the drying chambers at the distance of 15-20 cm from the floor surface. The coil of the metal-reinforced plastic pipe is made of at least two loops and a bypass loop along the perimeter of the drying chamber floor with a possibility of maintaining the sufficient temperature of heating water from heating devices, thus considering the length of each loop.

EFFECT: invention shall provide for the improvement of sawn timber drying conditions.

3 cl, 1 dwg, 1 tbl

FIELD: woodworking industry.

SUBSTANCE: drying method of round timber involves convective chamber drying, with that, prior to drying, the timber is subject to autoclave soaking with a 16-18% water solution of a mixture of ammonium nitrate and carbamide or ammonium nitrate and calcium nitrate, which are taken in the ratio of 1:1, and drying is performed before the timber reaches equilibrium humidity considering future operating conditions.

EFFECT: method allows eliminating the formation of shrinkage cracks, improving the appearance, providing stable timber dimensions during operation, thus increasing the service life of round timber materials.

2 dwg, 3 tbl

FIELD: process engineering.

SUBSTANCE: invention relates to drying of aerated cotton to be used in construction. Drying process is implemented in drying chamber. Said chamber can accommodate several lots of this material. Heat carrier is fed at drying chamber outlet while gas is discharged at its inlet at drying. Drying is performed in steps. For this first lot of this material is place at chamber inlet, in first drying zone. Heat carrier is continuously fed towards heat isolation material with discharge of used gases from drying chamber inlet zone outside, into exhaust ventilation. After first step drying, dried lot is displaced in steps towards outlet. Another lot is placed to drying zone inlet to repeat the process if required.

EFFECT: non-polluting process due to intensive removal of formaldehyde.

3 cl, 1 dwg

FIELD: heating.

SUBSTANCE: method involves application of waterborne paint onto inner surfaces and outer surfaces of a container and supply of heated air under pressure via an open side of the container for the purpose of, at least partial, drying of the paint on the inner surfaces and outer surfaces of the container. The system comprises a drying chamber and standard superchargers and heaters and can be installed in transportation premises.

EFFECT: reduced expenses or the possibility to rearrange the premises for existing drying chambers.

24 cl, 1 ex, 4 dwg

FIELD: woodworking industry.

SUBSTANCE: method of drying and thermo-wet processing of large-sized wood is carried out by removing the free moisture by alternating the stage of heating the wood and vacuuming, the stage of creating air pressure for 10-15 minutes, and when removing the inherent moisture the stage of warming wood is carried out by radiation-contact method, in the heating process the wood is exposed to saturated water steam with the temperature of 150-180°C, at the stage of vacuuming the pressure in the device is lowered by law P=3,0814e0,0334(TheataTTc.mTsur.mR2τ), where Theat is the temperature of wood after the previous stage of heating, °C; Tsur.m is the temperature of surface of the wood, °C; Tc.m is the temperature of the centre of the wood, °C; R is the radius or half the thickness of the wood, m; AT is the thermal diffusivity of wood, m2/s; τ is the current duration of the vacuuming stage, sec; the temperature difference between the surface and the centre of the wood (Tc.m-Tsur.m)=10÷12°C; after the termination of the vacuuming stage the wood is exposed to the air pressure of 5-10 atm.

EFFECT: invention enables to carry out simultaneous drying and thermo-wet processing of high-moisture large-sized wood.

1 dwg, 1 tbl

FIELD: chemistry.

SUBSTANCE: method of drying includes regeneration of drying agent, which consists in fact, that drying agent is supplied into drying chamber towards subject of drying, with further drying and re-supply into drying chamber. Drying of drying agent is performed in tube of gasodynamic temperature stratification.

EFFECT: increased energy efficiency of drying process.

2 dwg

Woods drying method // 2479807

FIELD: heating.

SUBSTANCE: in the drying method of woods, and namely logs of natural moisture content by arranging the latter in the drying chamber with refractory spiral-shaped contours, logs are dried by heat treatment by supplying the heat to logs in the form of a flame flow through refractory spiral-shaped contours; at that, first, end parts of logs are heated, then, middle parts are heated, and after that, heating is performed throughout the log length.

EFFECT: improving quality and reducing the drying time.

2 dwg

FIELD: process engineering.

SUBSTANCE: proposed invention relates to drying before processing and packing. In the case of food product, drying aims at ruling out whatever contact between said product and bacteria or other microorganisms. In usual conditions, general sterility can hardly be ensured between contact of food material and dry air. Besides, drying unavoidably involves some losses of volatile components caused by increased drying temperature. Proposed method comprises steps whereat gaseous medium with superheated steam is fed into envelope 2, food material is fed there inside to dry it therein. Dried food material is removed from said envelope 2. Said process is controlled on the basis of data on gas temperature and content of steam inside said envelope. Extracted gas medium is condensed to extract volatile matter from condensate. Proposed device comprises envelope 2 to keep gaseous medium with superheated steam. Note here that said envelope has inlet 40 and outlet 42. Device includes also the means 100 to generate said medium with superheated steam, first means 30 to displace food material via inlet 40 inside envelope 2, second means 30 to displace material through outlet 42 from envelope 2, and steam discharge pipeline 120 extending from outlet 122 to condenser 124, blower 128 arranged in steam discharge pipeline 120. Note here that said blower is controlled by control units on the basis of data on gas temperature and content of steam inside said envelope. Extracted gas medium is condensed to extract volatile matter from condensate.

EFFECT: efficient and sterile drying.

29 cl, 3 dwg

FIELD: heating.

SUBSTANCE: invention may be used for drying loose (disperse) materials in construction (for instance, cement drying), in production of construction materials (for instance, sand and dolomite in production of glass), in agriculture (for instance, grain drying), in food industry (for instance, for flour drying) and to dry industrial wastes (for instance, wood chips) and in other similar industries. In the method to dry loose materials in a flow moving inside a rotary inclined cylinder, in which the material together with the cylinder is heated inside the cylinder, at the same time the cylinder is heated from outside at the bottom by directed infrared radiation along its entire length, placing an infrared heater under the cylinder, and the loose material is heated with the heated inner surface of the cylinder in contact by convection of air heated with this surface inside the cylinder and radiation penetrating through the cylinder simultaneously, at the same time the cylinder is equipped with a device to vary an angle of inclination relatively to horizon and height relative to the base, and a flow of loose materials is formed by one or several such or identical cylinders with infrared heaters, placing them one after the other without gaps into a single line with an identical angle of inclination to the horizon, or one after the other in a single axial vertical plane with minimum gaps between them and different angles of inclination to the horizon, besides, cylinders are made from stainless steel comprising at least 18% of chrome, the external surface of the cylinder is coated with a heat-resistant organosilicic paint of black colour, and the ratio of the cylinder wall thickness to its external diameter is set by the ratio of 1 to 500, at the same time lengths of cylinders in the flow is set as two and (or) three metres.

EFFECT: method implementation makes it possible to simultaneously expand functional capabilities of loose materials drying, to considerably reduce energy intensity of drying process and to provide for environmental purity of heating in process of drying.

14 dwg

FIELD: woodworking industry.

SUBSTANCE: temperature of the drying agent according to dry-bulb thermometer during the entire drying process is kept constant in the range of 38°C to 108°C depending on the characteristics of the dried material, and the wet-bulb thermometer temperature is maintained below the dry-bulb thermometer temperature in the range from 0°C to 36°C, and changes stepwise in the direction of its decreasing, while dispersed hot water is fed to the chamber.

EFFECT: reduced drying time.

2 tbl, 2 dwg

FIELD: building materials production.

SUBSTANCE: invention relates to production of ceramic brick. Proposed method of green brick drying includes delivery of heat carrier, for instance, hot air into chamber opposite to object of drying and removal of used heat carrier, and also recirculation of used heat carrier into definite zone of chamber or into mixing chamber and delivery of steam to heat carrier to regulate pressure of steam in heat carrier. Green brick drying device contains chamber with inlet and outlet doors, cars moving along chamber, heat carrier delivery and removal channels with gates and recirculation channel and mixing chamber. Channel is provided to delivery steam with control shutoff valve. Said channel can be laid both to heat carrier delivery channel and to mixing chamber to control steam pressure in heat carrier.

EFFECT: prevention of brick cracking in drying.

3 cl, 1 dwg

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