SU551495A1 - Baking heat exchanger for preheating raw mix - Google Patents

Description

one

The invention relates to industrial building materials and is used to preheat a finely dispersed raw material mixture in suspension with kiln flue gases, for example, a rotary kiln firing cement clinker.

Cyclo-cascade heat exchangers are known for the heat treatment of a gel-crushed or powdered material in the state l.

The disadvantage of these heat exchangers is low efficiency and complexity of operation.

Also known is an installation consisting of several vertical heat exchange channels and chambers with a semicircular vault and an inclined base 2. The dome of each chamber connects the inlet channel with a vertical screen that is located on the side opposite to the inlet channel and ends at the outlet section of the chamber. The waste gases from the furnace pass through all the channels and chambers from bottom to top. The cored material is fed to the upper channel. In chambers under the action of centrifugal force

Particles of material are released from the gas mixture with the material and enter the furnace or vertical channel along an inclined base.

The disadvantages of the heat exchanger include the low deposition rate of the material in the heat exchanger chambers, since when the gas flow passes through the top ry chamber arch, the centrifugal force applies material particles to the chamber arch, and the gravitational force acts on dust particles in the opposite direction, as well as a large building height, which complicates its construction and increases the capital cost of it.

The purpose of the invention is to increase the intensity of heat treatment of the raw material and reduce capital costs.

Claims (2)

This is achieved by the fact that one wall of the heat exchanger is arcuate, and the ducts are inclined and have an annular upper part, and the heat exchangers are connected by ducts so that the annular part of the duct, extending the arcuate wall of the heat exchanger, forms a semi-ring. The drawing shows a general view of a heat exchanger. The device consists of several inclined gas ducts 1, 2 and 3 which are convertible into an annular shape and several heat exchangers 4, 5 with an arcuate wall. The annular gas duct of a separate step with the corresponding heat exchanger is connected so that the internal annular wall of the gas duct continues the annular line of the internal wall of the heat exchanger, forming a semiring. The cyclone 6 is used as the last heat transfer stage. The device operates as follows. The gases flowing from the furnace 7 enter the inclined flue 1. When the gas passes through the constriction 8 arranged in the flue 1, the velocity of the gases increases and the powdered raw material coming from the heat exchanger 4 is sucked into the gas flow. The gas picked up raw material is transported upward through duct 1. In the gas duct, the gases are cooled, and the powdered material is heated. As the gas passes through the annular gas duct, the dust-gas mixture receives rotational motion and the particles of the raw material are pressed against the wall by the action of centrifugal force. From the ring-shaped flue duct, the stream of dust-gas mixture enters the heat exchanger 5, where the gas loses speed and changes direction. The particles of the raw material do not have time to change direction and, by inertia, continue to move with the initial speed along the ring line. Under the action of centrifugal force, the dust particles are pressed against the arcuate wall of the heat exchanger, they lose speed and the inclined base of the heat exchanger enters the chute 10, which is fed into the furnace 7. The gas from the heat exchanger 5 is sucked into the subsequent gas duct 2, which when the flow of gas 12 is sucked in powdered raw material, the dust-gas mixture enters the annular part of the gas duct and into the heat exchanger 4. The exhaust gases of the furnace 7 after the passage of inclined, ring-shaped x gas conduits 1, 2, 3 and heat transfer nicks 5, 4, enter the cyclone 6, wherein the pulverulent material is finally vyde L from the gas stream, and the exhaust gases are moved to smoke exhauster. The devices are fed with a dry raw material through a chute 13, from which gas is sucked through a gas passage through a constriction 14 and the entrained space of a sloping gas head 3 is sucked in. depending on the raw material, it can be made in two versions: a) with the smallest radius of curvature of the annular gas duct and the arc wall CENI nebol'shchikh volume and heat exchangers; b) with the largest volume of heat exchangers and a large radius of curvature of the flue and the wall of the heat exchanger. Heat exchangers 4 and 5 may be the same or different sizes. With the same dimensions, heat exchangers are located at different levels. With different sizes, heat exchangers are located at the same level, for example, in FIG. 1 chambers 4 and 5 are of different sizes, the top of the chambers is at the same level. This heat exchanger design provides an increase in the deposition rate and, consequently, the degree of preheating of the raw material, as well as a decrease in the construction height of the device, capital expenditures for construction, and improvement of operating conditions. The inventive heat exchange device for heating the raw material mixture with furnace flue gases containing cyclone heat exchangers connected by ducts and chutes, is characterized in that, in order to increase the heat treatment efficiency and reduce capital costs, one wall of the heat exchanger is arcuate and the ducts are oblique and have an annular upper part, and the heat exchangers are connected by ducts so that the annular part of the duct extends the arcuate wall of the heat exchanger, thus pushes a semiring. Sources of information taken into account in the examination; 1. Mazurov D.Ya. Technological equipment of factories in living materials, M., stroiizdat, 1975, p. 249. 2. Patent of France No. 1559085 cl. F 27 B 13/00, published 1968. Waste gases Hampuaff YU