CS201318B1 - Apparatus for continuously cooling non-tacky granulated materials - Google Patents

Description

The present invention relates to a device for the continuous cooling of granular, non-sticky substances for use in the chemical and food industries.

There are known devices for cooling granular, non-sticky substances which work on the principle of fluidized bed. They consist of a vertical housing in whose upper and lower portions there are correspondingly arranged throats for the inlet and outlet of the gaseous cooling medium. A perforated gas distribution grate is mounted in the center of the housing, above which are arranged throats and dosing devices for supplying and discharging the cooled substance. To increase the heat exchange rate, heat exchange elements (snakes or tube bundles) are provided above the grate through which the liquid refrigerant flows.

The drawbacks of these devices are the large external dimensions of the main instruments, the need for auxiliary devices such as ventilation devices, dust collectors, considerable energy costs, partial destruction of substances during the fluidization process and difficult to maintain constant hydrodynamic conditions due to the formation of non-fluidized zones by means of heat exchange elements mounted thereon, thereby providing conditions for lump formation and material agglomeration.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a device for cooling granular, non-sticky substances which obviates the drawbacks of known devices, while ensuring uniform movement and cooling of the substance, as well as simple assembly, disassembly and maintenance during operation and low operating costs.

This object is achieved according to the invention in that the device according to the invention consists of a storage tank, heat exchange sections with horizontal, displaced arranged tubes and a discharge hopper, the nature of which is to provide a gas tank on each heat exchange section. the gas distribution pipes are welded, which are arranged inside the heat exchange section at the height of the horizontal partitions perpendicular to the cooling pipes.

Advantages of the invention are the gradual cooling of the granular material while maintaining its physical and mechanical structure, low energy costs, compact construction, high productivity, the possibility of sectioning for easy assembly and disassembly, and the possibility of cleaning the tubular space during operation with contaminated circulation water.

The invention is explained in more detail below by way of example. In the accompanying drawings: FIG. 1 is a longitudinal section through the apparatus, FIG. 2 is a view in the direction A of FIG. 1, and FIG.

The device according to the invention consists of a storage tank 5 under which the heat exchange sections 21 and a discharge tank 7 with an outlet neck 19 and a control slide 8 are arranged.

Each heat exchange section 21 consists of a vertical casing 1, two opposing walls of which are made in the form of a tubular grid 2. A bundle of horizontally displaced cooling tubes 3 is cooked to the tubular grid 2 and connected by two front chambers 4 and one rear chamber. The chambers 4, 17 are formed by horizontal partition walls 13 and 14 and vertical partition walls 15. One of the horizontal partition walls 13 is provided with a slot 18. The outer walls of the chambers 4 and 17 are flat lids 6 which are sealed by seals and fastened by screws The outer overflow tubes 20 are fastened to the lids 6, which provide a coolant connection between the heat exchange sections 21.

At the height of the horizontal partition walls 13 and 14, a gas tank 9 is arranged on one of the walls of the housing 1 perpendicular to the tubular grids 2. To this are welded gas distribution pipes 10 extending into the space between the tubes along the entire length of the section 21, The gas distribution pipes 10 are provided along their entire length with several rows of holes directed towards the bottom of the device. Throats 16 mounted on the gas tank 9; gas is supplied to the system, and the necks 11 and 12, which are welded respectively to the lower and upper sections 21, serve to inlet and outlet the coolant.

The device operates as follows: The granular material enters the storage tank 5, fills the space between the tubes of the heat exchange section 21 and enters the discharge tank 7. By means of the control slide 8 an even flow of material is adjusted so that all cooling tubes 3 were covered with material. The gas tank 9 is supplied with pressurized air (or other non-inert gas) which is directed downwardly through the holes in the gas distribution pipes 10 into the space between the pipes through the section 21 where the material flows. It flows around the material and pipes, the air is directed upwards to the top of the device and escapes into the atmosphere through the storage container 5.

The cooled material is forced to participate in two movements - a gradual, free-flow downward movement and an oscillating, induced gas flow. In this way, the cooling takes place mixed-convectively, by direct heat exchange with gas, and conductively, by means of a liquid coolant which flows through the cooling tubes 3 against the material. Purge air creates additional material mixing and eliminates the possibility of creating backwater zones.

Claims (1)

SUBJECT OF THE INVENTION Device for the continuous cooling of granular, non-sticky substances, consisting of a storage tank, horizontal heat exchange sections with displaced arranged tubes and a discharge hopper, characterized in that a gas tank (9) is provided on each heat exchange section (21) to which the gas distribution pipes (10) are welded inside the heat exchange section (21) at the height of the horizontal partition walls (13, 14) and perpendicular to the cooling elements. pipes (3).