SU129778A1 - Device for automatic temperature control in thermal oil-fired chamber furnaces - Google Patents

Description

The known devices for automatic adjustment of temperature in thermal oil-fired chamber furnaces, equipped with a large number of nozzles, containing temperature sensors acting through the regulators on the actuators controlling the fuel oil supply valves to the nozzles, are structurally difficult and do not provide uniform operation of the furnaces uniform pagreva metal.

The peculiarity of the proposed device is that the first stage pej torus is connected to a sensor installed in the center of the furnace, controls the supply of fuel oil to all nozzles, and the second stage controller controls the individual nozzles installed in the furnaces temperatures, some of which are connected to a serial stump to generate a C1 drive corresponding to the average temperature of the fireboxes, while others are connected to the controller via an idle switch, and to generate a signal, tvetstvuyuschego temperature difference of each of the thin and the arithmetic mean temperature.

Such an arrangement of an upron device, as its construction by reducing the number of regulators to two n, allows to maintain a uniform operation thin.

The second stage regulator, in the form of an automatic potentiometer, can be equipped with a double reohord, one part of which is connected to the serial chain of temperature sensors, and the other part is connected via a switch to the temperature sensors thin.

In the second stage regulator, a voltage divider can be used instead of a double rail.

FIG. 1 shows a diagram of the device; in fig. 2 - electric circuit of the second stage regulator in the form of a potentiometer with double reohord; in fig. 3 is an electrical circuit of a second stage regulator with a voltage divider.

Or 129778 2 The device consists of a controller / nepBoii stage and a controller 2 HTcpoii stage and works as follows.

The first stage regulator maintains a predetermined temperature in the working npocipaHCTse furnace 3 by varying the supply of fuel oil to the entire furnace (to all nozzles) by means of an adjustment valve 4 installed on a common fuel oil pipe 5. Regulation is performed by means of a thermocouple sensor 6 installed in the furnace eerpe 3. The torus 1 includes an automatic potentiometer 7, a pivot box 8 of the type IR-130 and a special mechanism 9 with feedback.

The regulator 2 of the second stage controls the actuators 10 and, through them, regulates. The 1N valves supply the fuel oil to the individual nozzles 12 placed in the furnaces 13 of the furnace 3. The top 2 regulator distributes the fuel oil to the individual nozzles 12 and maintains the same temperature all the furnaces 13, which is achieved by the fact that the controller 2 is connected to temperature sensors 14 and 15 installed in the furnaces. Some of these sensors (14 are connected to controller 2 through an electronic notenometer 16 with resistance P and isodrome 18 to generate a signal corresponding to the arithmetic mean temperature of the fireboxes 13, and other temperature sensors (/ 5) are connected to the controller 2 via a switch 19 to generate a signal corresponding to the difference between the temperature of each given firebox 13 and the arithmetic mean temperature.

 The arithmetic mean temperature is shown on the electrical circuit of the second stage controller 2, represented as a double reohord potentiometer 16 (Fig. 2), one part 20 of which is connected to the series circuit of sensors 14, and the other part 21 through switch 19 to sensors 15 of the furnaces .

In another embodiment of the electric circuit of the second stuni regulator (Fig. 2), voltage divider 22 is connected to sensors of temperating 14 and through switch 19 to sensors 15 of furnaces.

Prevention and Consideration

Claims (3)

1. Device for automatic temperature control in thermal oil-fired chamber furnaces equipped with a large number of nozzles, containing several temperature sensors acting through the regulators on the actuators controlling the supply valves of the oil to the nozzles, in order to minimize the operation by reducing the number of regulators to two and supporting uniform operation of the fireboxes; the first stage controller is connected to the sensor installed in the center of the furnace and controls the flow of fuel oil the second stage controller controls the actuators of the individual nozzles and is connected to the temperature sensors installed in the furnaces, some of which are connected in series to produce a signal corresponding to the arithmetic mean temperature thin and others are connected to the controller through a switch to generate a signal corresponding to the difference between the temperature of each given furnace and the arithmetic average temperature. . 2. Device but n. 1 with a second stunner regulator, made in the form of an automatic potentiometer, characterized by the use of a double rheochord, one part of which is connected to the series value of the temperature sensors, and the other part through a switch to the temperature sensors of the fire chambers. 3. A device change according to claim 2, characterized in that a voltage divider is used instead of a double rail.