RU2402420C1 - Method of plywood raw material cooking automatic control - Google Patents

Abstract

FIELD: process engineering. ^ SUBSTANCE: invention relates to woodworking, particularly to cooking. Proposed system comprises temperature pickups arranged in the bath, steam line with actuator mechanism, control unit, industrial controller, control computer, bath water level pickups, feed pipe water pressure and temperature pickups, filtration system, water heating system and bath water level control system. Outputs of said pickups are connected to controller input module which, in its turn, is connected via output module to actuator mechanism. Filtration and water preparation system communicating aforesaid bath and heat exchanger consists of auger pump and industrial fine filter. ^ EFFECT: higher efficiency, lower heat losses, control over bath water level. ^ 1 dwg

Description

The invention relates to the woodworking industry, in particular to hydrothermal processing of wood.

A known system for automatically controlling the hydrothermal treatment of wood, comprising liquid temperature sensors installed in a vessel having a steam line with an actuator, a control unit, steam parameter sensors, an operator console, an indication and alarm unit, diagnostic and analysis units, data processing units, an interface unit , shaper and sensors of the load factor of capacity, parameters of plywood raw materials and the state of the environment [USSR Author's Certificate No. 1055550, V27K 1/02; B27K 3/02, 11.23.83. Bull. No. 43].

The disadvantages of the prototype are: the lack of filtration of water, which leads to loss of thermal energy, since the hot water entering the section of the pool, transferring heat to the plywood ridges, cools down, and is also contaminated with mineral and wood fiber particles, after the hydrothermal treatment cycle, the water merges, a new one is heated water, which leads to additional losses of heat and working time; lack of a system for regulating the water level in the pool, which leads to underfilling or overflow of water in the pool (for example, when loading raw materials); heat loss when supplying steam directly to the pool, as when steam is supplied through pipes laid along the bottom of the pool, a lot of steam goes into the atmosphere, not having time to transfer heat to water, which leads to loss of thermal energy.

The invention solves the problem of increasing the efficiency of the hydrothermal processing of plywood raw materials by purifying the pool water from mineral and wood-fiber impurities, reducing heat loss and regulating the pool water level.

This is achieved by the fact that the system of automatic control of the process of hydrothermal processing of plywood raw materials containing temperature sensors installed in the pool, a steam pipe with an actuator, a control unit according to the invention is additionally equipped with an industrial controller, a control computer, water level sensors in the pool, pressure and temperature sensors water in the supply pipe, a filtration and heating system and a system for regulating the water level in the pool, and the sensors are connected with their outputs inens with the controller input module, which, in turn, is connected to the actuators via the output module, the water filtration and heating system connecting the pool and the heat exchanger consists of a screw pump and an industrial fine filter, and the pool water level control system consists of water level control sensors located on the pool walls and connected to the controller input module, and actuators connected to the controller output module.

A closed loop is implemented in the water filtration and heating system. So, from a resistance thermometer, a signal about a temperature change is supplied to a technological controller (for example, ADAM-5000), after which a control signal is sent to a screw pump electric motor, which pumps water from the pool to the heat exchanger to heat it with steam from the boiler room. An industrial fine filter of the FMO type is installed in front of the heat exchanger, thus filtering, water heating and heat energy are saved.

Capacitive level gauges installed in the pool measure and enter the water level in the pool into the process controller (for example, ADAM-5000), it receives a control signal to the actuators, either drain or add water, depending on its level.

In the heat exchanger, heat is transferred from the steam from the boiler room to the water circulating through the heat exchanger. With this method, thermal energy is almost completely transferred from the steam from the boiler room to the water in the pool.

The drawing shows a system for automatic control of the process of hydrothermal processing of plywood raw materials.

The scheme includes (positions) a pool 1, a heat exchanger 2, a supply pipe 3, a return pipe 4, a filter 5, a water topping-up pipeline 6, an actuator for regulating the supply of water to the pool 7, sensors for measuring the water level in the pool 8, actuators for regulating the topping and draining water from the pool 9 and 10, the drain pipe 11, a sensor for measuring the temperature of the water in the supply pipe 12, a screw pump with an electric motor 13, a sensor for measuring the pressure of the water in the supply pipe 14, water temperature sensors installed in different pool glasses 15, a module for inputting signals from sensors (for example, ADAM-5017H) 16, an output module (for example, ADAM-5024) 17, an industrial controller (for example, ADAM-5000 / TCP) 18, a control computer (for example, SIMATIC RACK PC 840 V2) 19, operator console 20.

The system operates as follows. From the operator panel 20 or from the control computer 19, the system enable signal is sent to the controller 18, test pulses are sent from the output module 17 to the actuators 7-10 and the screw pump motor 13, from the input module 16 the test pulses are sent to the sensors 15, 14, 12 , 8, signals are returned from the devices about their serviceability or malfunction to the industrial controller 18, the operator console 20, the control computer 19. After receiving information about the health of the sensors and actuators, the industrial controller 18 temperature values obtained from the sensors placed in the pool, with the temperature set by the technological requirements, signals the switch actuator 7 disposed on the feed pipe 3, and heated water is fed into the pool.

On the supply pipe 3 there are sensors 12 for measuring water temperature and 14 for measuring water pressure, the information from which is supplied to the industrial controller 18 through the input module, where it is processed, and to the operator console 20 and the control computer 19.

After warming up the water in the pool to the temperature set by the technological mode, the pool is loading. When the pool 1 is loaded with plywood raw materials, the water level in the pool rises, a signal is sent from the level 8 sensors to the industrial controller 18 and the operator panel 20, information from the level 8 sensors is processed by the industrial controller 18 and a control action is generated to turn on the actuator 10 and to discharge the water to a predetermined level.

In the process of warming up plywood raw materials, hot water entering the pool section, transferring heat to plywood ridges, cools, and is also contaminated with mineral and wood fiber particles. From the temperature sensor 15, a signal about the temperature change is supplied to the industrial controller 18, after which the signal is supplied to the electric motor of the screw pump 13, which pumps water from the pool 1 to the heat exchanger 2 to heat it with steam from the boiler room. Thereby, the required mode of raw material boiling is automatically realized and controlled. In front of the heat exchanger, an industrial fine filter of type 5 FMO is installed, thus, heating and purification of water in the pool occur.

The proposed system is designed in such a way that it provides operation in three modes: in automatic mode — used in processing serial batches of plywood raw materials and being the main operating mode; manual control, where all operations are performed by the operator from the operator panel 20; in advisor mode, i.e. the industrial controller 18 issues recommendations to the operator console 20 on all parameters of the process flow. Management is carried out by the operator from the operator panel 20.

During the process of hydrothermal processing, the parameters of temperature, level and pressure measurements received from the sensors, as well as information about shifts and batches, are recorded and stored in the database of the control computer, then the industrial computer analyzes the process parameters according to the program and provides them to actuators based on the analysis control actions for optimal process flow.

Claims (1)

A system for automatically controlling the process of hydrothermal processing of plywood raw materials, containing temperature sensors installed in the pool, a steam line with an actuator, a control unit, characterized in that it is additionally equipped with an industrial controller, a control computer, sensors for the water level in the pool, pressure sensors and water temperature in the supply pipe, the filtration system, the water heating system and the system for regulating the water level in the pool, the sensors being connected to the mode by their outputs Controller input it, which in turn, via the output module is connected to the actuators, filtering and water heating system, swimming pool and connecting the heat exchanger consists of a screw pump and industrial fine filter.