SU1761498A1 - Device for heat-and-moisture treatment of materials and products - Google Patents

Abstract

Use: in the building materials industry for heat and moisture treatment of materials and products of precast concrete. SUMMARY OF THE INVENTION: The device comprises a chamber, a generator with a confuser adjacent to the combustion chamber, in which a humidifier is installed coaxially, made in the form of two coaxially installed pipes — an external air supply and an internal water supply — a cylindrical mixer and a diffuser are sequentially connected to the confuser , through which the vapor-gas mixture enters the injection pipe and into the chamber. The exhaust coolant is discharged through the suction pipe and the fan into the confuser, part of the excess gas-vapor mixture is discharged into the atmosphere. 2 Il.

Description

W

J

The invention relates to devices for the production of vapor-gas mixtures and can be used primarily in the building materials industry for the heat-moisture treatment of materials and products, for example, precast concrete.

A heat generator is known, consisting of a furnace with a burner, a recirculation fan and an ejector, formed by conjugation of the flue gas line and the discharge line of a recirculation fan. The main disadvantage of the heat generator is that the known device allows to obtain a coolant with natural moisture, and this limits the possibilities of its use. Specifically, this device can be effectively used only for steaming lightweight concrete, due to the fact that under the influence of heated gases

and moisture removal combined. When steaming such a mixture of heavy concretes, premature overdrying is observed and, as a result, poor quality of the products.

The closest in technical essence and the achieved result is a device for heat treatment of concrete products, comprising a chamber, a coolant generator, a humidifying device, and a circulation system consisting of a fan, a suction and discharge pipe. In such a device, in order to obtain a moist heat transfer fluid, a mixing tank is installed in the discharge section of the pipeline between the chamber fencing and the heat generator and consists of a closed cylindrical casing, in the upper part of which there is a spray manifold with sprays and a trough with perforated pipes. Device

ixi

ON

J

43 00

works as follows. Water from the sprayer is supplied to the perforated pipes and spreads over their outer and inner surfaces. Simultaneously, the heated coolant (combustion products of gas) with a temperature of 150-250 ° C from the heat generator enters the humidifying device, where it is moistened and fed into the heat chamber processing. The degree of moisture of the coolant is controlled by turning the sector shutter, which closes the entrance to the trough, and the amount of incoming water. Such a device allows to expand its applicability. The disadvantages of the known device consist in large dimensions of the device for moistening the heat transfer medium, since to ensure a sufficiently high degree of humidity, a large evaporation surface is required, and accordingly a large material and metal consumption.

The purpose of the invention is to reduce the material and metal intensity while maintaining high accuracy in controlling the humidity of the heat transfer fluid.

This goal is achieved by the fact that in a device for heat and humidity treatment of materials and products, comprising a chamber of a heat transfer generator, a humidifier and a circulation system consisting of a fan, a suction and discharge pipe, the latter is equipped with a sequentially installed confuser, a cylindrical mixer and a diffuser, the humidifier is placed inside and coaxially to the confuser and is made in the form of two coaxially installed pipes - external for air supply and internal for water supply, and a generator see ntirovan on converging tube inlet.

Fig. 1 schematically shows a device for heat and moisture treatment of materials; in fig. 2 - a section of the sprayer.

The device contains a chamber 1, a heat generator 2, whose combustion chamber 3 is adjacent to a confuser 4 with a humidifier 5 coaxially installed inside, consisting of two coaxially arranged pipes with valves b, external supply air 7 and internal supply water 9. To confusor 4 a cylindrical mixer 9, a diffuser 10, and an inlet pipe 11 are connected in series. For uniform heat treatment of the products, a circulation system with a fan 12 and a chimney 13 is provided.

The device works as follows.

In the combustion chamber 3 of the heat generator 2 burn fuel (gaseous, liquid or solid). Combustion products with a temperature of 950-1000 ° C enter confuser 4,

where the mixture from the circulation system 12 is fed simultaneously. As a result of mixing, the temperature of the combustion products decreases to 600-700 ° C. Then, the resulting mixture enters a cylindrical mixer 9, where it is saturated with fine water, obtained by aerodynamic crushing of water, carried out with the help of a humidifier 5, which is activated by opening valves 6 on air pipe 7 and water 8. Mixing with gas by the mixture, the water is heated and turned into water vapor. The degree of wetting of the gas-vapor mixture is regulated by the flow rate of water, the amount of combustible fuel 0 of the circulating mixture. The vapor – gas mixture obtained in this way with a temperature of 90–100 ° C and a given humidity enters the heat treatment chamber 1.

In the absence of the need to humidify the coolant (usually at the stage of heating concrete products), the valve 6 on the water pipeline 8 is completely shut off and the water supply is stopped at that. Excess heat transfer due to the operation of the device is discharged from the recirculation system through the exhaust pipe 13.

For example, samples of heavy concrete are treated using the proposed

5 devices as follows. At the stage of heating the products, the temperature of the gas combustion products varies from 50 to 90 ° C for 2 hours, while the water in the humidifier is closed. After reaching the concrete

0 temperature 50-60 ° C, in the second stage of heating, the valve 6 on the pipeline 8 is opened, water is sprayed in the flow of heated flue gases, bringing the vapor content in the gas to 60%. Combination in

5, the vapor – gas mixture of heat and moisture necessary for the solidification of hydraulic products in the process allows, eliminating the premature drying of the products, to heat them to the required temperature of 800– 90 ° C and maintain it at this level for the remainder of the drying period.

Claims (1)

This ensures quality products from heavy concrete. Invention Formula 5 A device for heat and moisture treatment of materials and products, comprising a chamber, a coolant generator, a humidifier, and a circulation system consisting of a suction and discharge piping fan, characterized by By the fact that, in order to reduce material and metal intensity while maintaining high accuracy in controlling the humidity of the heat transfer fluid, the injection pipeline is equipped with sequentially installed 5 pumps for supplying water, and the generator is equipped with a confuser and a cylindrical mixer and is inlet at the confuser. B 6 J 3 2 C 5 A xx -V v tf - A st 2I liZZZZZZZ Ј - a diffuser, while the humidifier is placed inside and coaxially with the confuser and is made in the form of two coaxially installed pipes - external for air supply and internal F, -. i