SU1377556A1 - Arrangement for recovering heat of rotating furnace - Google Patents

Description

The invention is relative to heat engineering, in particular, to devices for using heat of radiation from a rotary kiln body, such as inclined kilns for burning cement clinker and expanded clay.

The purpose of the invention is to increase the efficiency of heat recovery and reliability of the furnace.

FIG. 1 shows a furnace with a device for heat recovery, a cross-section; in fig. 2 is an axonometric diagram of the utilization device; in fig. 3 - kinematic connection of the half shells of the heat sink in the working position with a minimum clearance; in fig. 4 - the same, when the semi-shells are folded back.

The device for heat recovery contains heat-absorbing half-shells 1, envelopes with a gap between the furnace body 2 and pipes 3 connected to the shell-and-tube heat exchangers 4 heat consumers. Semi-shells 1 are the evaporation parts of thermo-siphons, the condensers of which are heat exchangers 4. The semi-shells are welded to the sleeves 5, through which the axes 6 are mounted on the racks 7.

A system of rods 8 is welded to the sleeves 5, on which counterweights 9 are installed, which create a constant amount of torque, and movable counterweights 10, with which you can change the value of torque within a small range.

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A rod I is welded to the hub 5 of one of the half-shells 1 (in this case, the left one) with a roller 12 at the end, which interacts with a cam 13 mounted on the drive shaft 14, which is an electric motor with a gearbox. The roller 12 and the cam 13 form a cam mechanism for smoothly adjusting the half-shells. Due to the additional moment created by the movable counterweights 10, a constant contact of the roller 12 with the cam 13 is ensured.

Plates 15 are welded to the sleeves 5 with grooves in which the finger 16 is loosely mounted. For the pin 16, vertical guides 17 are provided, rigidly connected to the base of the furnace 2. Rotate stops 18 are welded to the sleeves 5, which together with the stops 19 provide the minimum allowable the gap between the furnace 2 and the half-shells 1 of the heat sink. The disposal device provides flexible hoses 20 for draining heated water in heat exchangers A to a sump 21, equipped with a temperature sensor 22 connected by a pulsed line to the drive control unit 23.

A device for heat recovery of a rotary kiln operates as follows:

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The heat radiation from the housing of the rotary kiln 2 is perceived by the half-shells 1 of the heat-collector, which are installed with a calculated gap relative to the furnace 2. The heat carrier located in the half-shells 1 evaporates and through the pipes 3 enters the annular space of the heat exchangers 4, where it condenses into the water-cooling pipes and the heat pipes. returns to the cavity of the heat sink. When heated in heat exchangers 4, the flexible hoses 20 flow into the sump 21. When the upper set temperature limit of the heated water is exceeded, the electrical signal from the temperature sensor 22 is transmitted to the control unit 23 by the drive 14. The drive motor 14 is turned on, which through the gearbox starts rotating the cam 13. The rotation of the cam 13 with a predetermined profile causes a change in the position of the roller 12, which is constantly in contact

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cam 13 due to a certain excess of the total torque generated by the counterweight system 9 and 10. over the torque created by the half-shell 1 (left in this case).

Changing the position of the roller 12 and the shaft 11 causes the left sleeve 5 and the left half shell 1 welded to it to rotate around axis 6.

The deviation of one of the half-shells 1 causes the rotation of the plate 15 (left), which through the finger 16 begins to deflect the plate 15 of the right half-shell 1 and causes it to turn around the axis 6 at the same angle in the opposite direction.

Thus, the rotation of the cam 13 causes the deviation of both semi-shells 1 of the disposal device and the air gap between the furnace body 2 and the heat sink increases. The amount of heat perceived by the half-shells 1 of the heat sink decreases in this case, and the temperature of the heated water accordingly decreases.

If the temperature of the heated water is within the prescribed limits, the half-shells 1 of the heat sink for heat recovery are stationary. When the water temperature drops from the sensor 22, a signal is sent to the control unit 23 of the actuator 14, which rotates the cam 13 in the opposite direction. This begins the convergence of the half-shells 1 of the heat sink.

Such a change in the gap between the furnace body 2 and the heat sink allows smooth control of the heat sink from the surface of the furnace body 2 and the heat capacity of the disposal device, while maintaining the set temperatures of the heated water and the furnace body 2.

The furnace 2 is equipped with temperature sensors on the outer surface of the furnace body 2 (not shown), the signal of which, if the specified limit value is exceeded, unit 23 automatically fully opens the half-shells 1. As a result, the maximum cooling intensity of the body is achieved. In addition, it is possible to manually control the actuator 14 (for example, if necessary to inspect the hull. Furnace 2 and carry out repairs).

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The device provides a constant correspondence between the amount of heat required by the consumer and the amount of heat perceived by the heat receptacle at insignificant (within specified limits) temperature variations of the furnace body 2, This increases the reliability of operation of the furnace 2 and, besides

moreover, it allows to operate the heat-utilization device almost all year round and around the clock, and only in rare (emergency) cases use the foreseen possibility of the complete overturning of half-shelves 1, in which there is no heat utilization.

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19 18 15 15 f6 Ю 13 Fig.З

Editor A. Ogar

Tehred L. Serdyukova

Order 1267

Circulation 533

VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5

Production and Publishing Combine Patent, Uzhgorod, st. Gagarin, 101

Proofreader M. Pojo

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Claims (1)

DEVICE FOR DISPOSAL OF HEAT OF ROTARY FURNACE, containing a heat sink made in the form of half-shells located along the axis of the furnace, covering the furnace along