SU980804A1 - Gas distributing apparatus - Google Patents

Description

The invention relates to the design of a fluidized bed apparatus with localized spouting zones and. can be used for drying and granulation from solutions.

Known gas distribution device for fluidized bed apparatus with a layer consisting of a body divided by a horizontal partition into two, chambers, the upper of which serves to introduce a fluidizing agent and is provided with a gas distribution grid with a discharge pipe, and the lower one - to introduce a heat carrier and is equipped with nozzles with feeders. In the lower part of the nozzles, the guide vanes are reinforced, and the feeders are equipped with tubes installed coaxially with a gap 1,

The closest in technical essence to the present invention is a gas distribution device for fluidized bed apparatus, comprising a housing divided by a horizontal partition into two chambers, the upper part of which serves to introduce a fluidizing agent, and the nest n is for heating fluid and is equipped with nozzles with feeders. A hot coolant is fed to the lower chamber.

going through the nozzles to the zone of liquefaction. The cold liquefied agent is fed into the upper chamber and 5 layers are liquefied through a perforated bottom.

t; in

2. lattice

The disadvantage of these structures is that during the drying and granulation of solutions the cold fluidizing

The agent entering the reaction zone contacts the lower layers with the granules and creates a sharp temperature difference on the surface of the heated granules, which leads to cracking of their surface and increased dust formation, and hence the loss of a part of the material, which is especially noticeable during drying, for example, sulphate solutions of salts, and a high temperature of the heat carrier. In addition, the hot coolant splits the lower part of the chamber up to 800-900Cj, which requires the use of special steels and increased 11 layers

25 heat insulations and, consequently, leads to an increase in the weight and dimensions of the device.

The purpose of the invention is to improve quality and reliability and reduce

Claims (2)

30 energy consumption due to the use of heat from a hot coolant to heat a fluidizing agent. This goal is achieved by providing a gas distribution device for fluidized bed apparatus, comprising a housing divided by a horizontal partition into two chambers, the top of which is used to introduce a liquefying agent and a gas distribution grid with a discharge pipe, and the bottom one - for introducing a heat carrier and equipped with nozzles with feeders; both chambers are equipped with a vertical partition; the upper body is coaxial with the body, and the upper is a protective shell, while a flue duct is formed between the partition and the walls of the body; the passage through which the fluidizing agent is heated lowers the heating of the lower chamber. The figure schematically shows the proposed device. The gas distribution device consists of a housing 1, the walls of which with a vertical partition 2 form a duct 3 for a fluidizing agent, a horizontal partition 4, on which is installed a nozzle for unloading product 5 and a nozzle b. In the bottom of the housing 1 there are glands 7, through which the feeders 8 are inserted. In the upper part, the gas distribution grid 9 together with the protective shell 10 and the vertical partition 2 form the upper chamber 11 into which a fluidizing agent is supplied through the fitting 12. In the lower part of the housing 1 there is a lower chamber 13 into which a hot coolant is supplied through the fitting 14. For uniform distribution of the coolant in the chamber 13 is placed a distribution grid 15. The device operates as follows. A hot coolant with a temperature of 700-800 s in the required quantity enters the submerged chamber 13 through the fitting 14 and enters the layer through the nozzles 6. Material particles spilled through the gas distribution grid 9 remain in the upper chamber 11, not falling into the ducts 3 due to the protective shell 10 The fluidizing agent, the passage through the gas passage 3, is heated to 250-400 ° C and supplied through the gas distribution grid 9 to the zone of fluidization of the bed. The particles in the fluidizing bed are continuously enlarged as they reach a certain size, are continuously withdrawn through the pipe 5, where air is also supplied, whose speed is regulated depending on the desired size of the granules. Heating a fluidizing agent makes it possible to reduce the crushing of granules in the layer, and thus, to reduce the dust loss, to increase the productivity and service life of the device. The use of the proposed gas distribution device in installations for granulation and drying from sulphate solutions in fluidized bed apparatus allows, due to the redistribution of temperatures between the fluidizing agent and the hot coolant, to reduce the temperature of the latter in the gas distribution chamber to 600-650 ° C. Thus, it is possible to use nickel-free chromium steels of the type X17, operating in the region of these temperatures, which saves scarce materials, such as nickel. In addition, a decrease in the temperature in the chamber of a hot heat transfer gas distributing device makes it possible to increase the service life of the device by 5–6 times as compared with the known device, whose service life is not more than months. Due to the higher temperature of the fluidizing agent, a uniform temperature field is created in the reaction zone, which helps to reduce dust generation and the amount of hot coolant supplied, and consequently, reduce dust removal from the reaction zone, and when using compressed air and save it by 10-20%. Claim 1. Gas distributing device for fluidized bed apparatus, comprising a housing divided by a transverse partition into two chambers, the upper of which serves to introduce a fluidizing agent and is provided with a gas distribution grid with a discharge pipe, and the lower one serves to introduce a coolant and is equipped with nozzles with feeders , characterized in that, in order to improve quality and reliability and reduce energy resources by using the heat of the hot coolant to heat the fluidizing agent coagulant, cameras are provided with vertically mounted coaxially with the housing wall, the walls forming the housing for the flue fluidizing agent. 2. The device according to claim 1, characterized in that the upper chamber is provided with a protective shell. Sources of information taken into account in the examination 1. USSR author's certificate number 324062, cl. At 01 J 8/18, 1970. 2. USSR author's certificate number 199827, cl. B 01 J 8/18, 1967. Product yield