SK1102013A3 - Self regulating charger for rotary drum furnace - Google Patents

Abstract

The present invention provides a method of dispensing a feedstock into a rotary kiln, maintaining a material height in the working area of the process equipment, and eliminating the overflow of feed material from the rotary kiln by placing a shutter hopper and a ladle assembly in the rotary kiln inlet. In the body of the rotary kiln (1) protected by the armor (2), there is a hopper (4) which provides the supply of input material. The hopper (4) is connected to a half-crescent-shaped gate (3) raised by a portion of the circular section and forms a partition preventing the material from flowing towards the flange (6). The material that falls into the space between the gate (3) and the flange (6) is picked up by the ladle assembly (5) and returned to the gate (3) into the working part of the furnace (1). With the rotation of the rotary kiln (1), the scoops (5) carry the collected material above the height of the gate (3) by sliding the rotary kiln (1) and slip by the gravity and inclination of the scoops (5). The hopper (4) and the gate (3) are connected by means of joints (7) which can be fixed or movable.

Description

Self-regulating rotary kiln metering unit

Technical field

The invention relates to the feeding of bulk materials into a rotary kiln for the purpose of heat treatment. The bulk material is uniformly metered into the inlet portion of the rotary furnace as required and adjusted by the furnace thermal conditions to treat the input material and the desired outlet. The level of material in the furnace determines the total filling of the furnace. The design of the dispenser prevents the dispensed material from falling out of the furnace working space. The self-regulating rotary kiln feeder improves the operation of rotary devices, improves thermal-operating conditions therein and reduces environmental load on the environment.

BACKGROUND OF THE INVENTION

At present, two basic solutions are used to feed the feedstocks into rotary kilns, which are available and largely modified by the users of these aggregates. Both consist of a hopper which in the first case is continuously filled and the material is dosed by rotating the rotary kiln body. In the second case, the material is continuously resp. periodically weighed and dosed by a hopper into a rotary kiln. In the first case, the furnace fill level is determined by the location of the hopper in the furnace body, the top edge of the hopper determines the furnace level in the furnace. The amount of feed material is proportional to the furnace speed. In the latter case, the level is determined by the amount of feed material and also by the furnace speed. The height of the material level is indirectly influenced by the furnace flange height. If the height of the material exceeds its height, the material will fall out of the furnace. Its increase results in a negative influence on the thermal conditions in the furnace due to the reduced free cross-section for flue gas outlet from the furnace.

The robustness and operating environment of rotary kilns requires a solution, the dosing of the feedstock, whose maintenance, durability and functionality are close to the technological optimum in terms of operation, minimization of costs and, above all, reliability and simplicity.

SUMMARY OF THE INVENTION

The rotary kiln self-regulating metering unit meets the requirements of simplicity, reliability and support to achieve optimum thermo-technical conditions in the heat generator. It is an object of the present invention to provide a continuous feed metering feed into a cold portion of a rotary kiln, where the amount of feed is controlled by the furnace speed and the fill level of the furnace body is determined by the hopper location and height of the slide located in the furnace body. Proper setting of the level of filling of the rotary kiln of various raw materials ensures conditions for the possibility of optimal operation of the thermal-technical firing processes, resp. adjusting the feedstock, and thus, in global terms, the prerequisites to reduce the cost of the technological process.

The hopper of the self-regulating dispenser is generally a thick-walled tube of circular cross-section that provides material feed from the hopper to the furnace inlet. The movement of the material is caused by the effect of gravitational forces. The outlet end of the hopper is located behind the damper, which limits the maximum height of the material layer in the rotary kiln and at the same time prevents the flow of material towards the inlet part of the kiln, respectively. to the flange and thus eliminates the material falling out of the furnace. The damper is a partition that delimits and limits the "working environment" of the furnace by separating the increased material level in the furnace from the flange whose height is lower than the material level in the furnace and thereby prevents, respectively. minimizes material overflow from the rotary kiln.

The damper is attached to a hopper that is not rigidly connected to the rotary kiln body and hence its location is not dependent on the rotary movement of the kiln. The part of the material which, due to the various internal actions in the operation of the rotary kiln (reflection of larger fractions of raw material, sudden shutdown of the kiln due to failure, gap between the damper and furnace body, ...) may be well in front of the damper. into the space between the flange and the dam. This material with a system of scoops - baffles, which are firmly attached to the armor of the rotary kiln and due to the rotary movement of the furnace returns to the environment behind the damper, ie to the "working part" of the rotary kiln for its subsequent heat treatment.

Such a design eliminates, respectively. provides the possibility to prepare in advance the thermo-technical prerequisites for the operation of the rotary kiln by ensuring a continuous supply of raw material. The furnace speed can be used to control the amount supplied to the process and at the same time eliminate the overflow of the feedstock at an increased feedstock level in the furnace. This will increase the efficiency and approach to the possibility of technological optimum operation of the rotary kiln, which improves the economic and environmental indicators of the process.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention is explained in more detail in the accompanying drawings. Figure 1 is a three-dimensional view of the location of the hopper with the damper in the rotary kiln body. Figure 2 shows a detail of the internal view of the solution in the rotary kiln body, and Figure 3 shows its REZ A-A, detail of the solution, the location of the hopper with the damper in the rotary kiln.

DETAILED DESCRIPTION OF THE INVENTION

The inner part of the body of the rotary kiln 1 is protected on its inlet side against the abrasive effects of the dosed feedstock. A hopper 4 is introduced into the interior of the inlet part of the rotary kiln 1, which, under the influence of gravitational force, transports the material from the hopper to the working part of the rotary kiln. The minimum diameter of the hopper 4 is generally greater than three times the diameter of the largest piece of feed material. The hopper 4 is connected to the rotary kiln 1 and is connected to the damper 3. It forms a partition which prevents the material from falling towards the flange 6 (the inlet part) and determines the maximum height of the feed material layer into the rotary kiln. o The part of the circular die that is fitted and connected to the crescent shape in the part opposite to the direction of rotation of the rotary kiln L The material which passes through the damper 3 reaches the space defined by the damper 3 and the flange 6. the furnace 1 is returned to the working part of the furnace 1. The setting, size and slope of the buckets 5 are adapted so that the collected material is exported above the height of the slider 3 and by gravity and slope of the buckets 5 slips behind the slider 3. 3 is by means of connections 7 which can be fixed or movable.

This self-regulating dispenser design allows the feed material to be fed continuously into the rotary kiln, eliminating its overflow outside the rotary kiln.

Industrial usability

According to the invention, the solution has the attributes to be widely used mainly in rotating equipment, heavy industry (mining, metallurgy), engineering, construction, chemical industry, agriculture, food industry as well as other manufacturing sectors as mentioned above. exemplary use. The proposed self-regulating rotary kiln feeder can be used wherever there is a need for continuous conveying of bulk materials to rotary kilns and dryers in order to optimize the thermo-technical conditions of the process while avoiding the loss of raw material from the kiln during its dosing.

The self-regulating rotary kiln feeder designed in this way can be used for any rotary equipment that can be used for technological, energy and environmental processes. Wherever it is necessary to adopt preconditions to clearly limit and eliminate the internal process environment, whether incineration, heating or cooling from external influences and to ensure a continuous supply of raw material into the heat-technical process, eliminating its sinking outside the furnace and thereby improving internal conditions in technological equipment, reduce the cost of unit production of treated raw materials while eliminating environmental pollution.

Claims (1)

PATENT CLAIMS Self-regulating rotary kiln metering unit A self-regulating rotary kiln feeder characterized in that a hopper (4) is connected to the inside of the inlet part of the rotary kiln (1), the armored part (2), which is fixed or movably connected to the damper (7). 3) crescent-shaped, increased by a part of the circular die, the space between the dam (3) and the flange (6) is fitted with a system of scoops (5). DRAWINGS Self-regulating rotary kiln metering unit