SU91749A1 - The method of using the physical heat of liquid slag boilers - Google Patents

Description

Slag crushing to use the physical heat of the liquid slag is usually carried out with continuous or countercurrent compressed air with a relatively large energy consumption.

In the proposed method, with the aim of possibly reducing the pressure of the compressed air (steam) to increase the efficiency of the installation, the slag is crushed by a sharp flat stream of air (steam) directed normally to the stream of slag. In addition, in a device for carrying out this method, in order to increase the efficiency of using slag heat, a multi-stage air heating scheme using sequentially installed cyclones was used.

The drawing shows an installation diagram for carrying out the proposed method.

The method for utilizing the physical heat of the liquid slag is intended to preheat the air, which is then sent to a dust preparation plant or to the combustion chamber of a steam boiler. The liquid slag flowing out of the notch 1 of the combustion chamber 2 is collected in the sleeve 3, from where it flows out into the vertical chamber 4 as a film, then it is crushed by a sharp stream of compressed air or steam. At the same time, in order to reduce the pressure of compressed air (steam) to increase the efficiency of the installation, the slag is crushed by a flat stream of air (steam), which is directed normally to the effluent slag stream through nozzles 5. In order to maintain the temperature of the slag collected in the muffle, the desired level, in order to maintain the viscosity (about 50 poises) required in the slag outflow in the muffle 3, a small amount of dust is burned, the combustion products of which are discharged through pipeline 6 to the combustion chamber 2. On the wall The chamber 4 against the nozzles 5 is equipped with a water-cooled panel 7, which serves to prevent the slag from adhering to the wall of the chamber.

The air pressure (steam) for crushing the slag should be such that, as a result of granulation, slag pieces of the number 91749 are obtained. . . .

up to mm High-temperature, granular, hot slag does not occur. Inclined - lined estrus 8 into a vertical pipe 9, where it is picked up by a stream of heated air from a second-stage cyclone 10. Heat transfer from the slag to the heating, hemus air occurs -Intensively, since the size of the granulated slag particles is small. The heated air enters under pressure through the air duct 11 from the discharge duct of the blower fan (not shown in the drawing). In order to prevent the random chamber from entering the combustion chamber 2 through a tap hole / heated air, as well as from entering compressed (primary) air there to crush the slag at the junction of the inclined lined chute 8 and the vertical pipe 9, the ejection of the rarefaction is greater than the rarefaction in the letke. In addition, at the end of the lined, estrus 8, a sensitive flash 13 is located, which continuously produces slag.

The slag-air mixture through a vertical pipe 9 enters the cyclone 14 of the first stage, where slag separation takes place. The cleaned preheated air is then guided through conduit 15 to a pulverizer unit or to a combustion chamber (not shown in the drawing) of a steam boiler. The slag that is separated out in the cyclone 14 of the first stage is picked up with cold air from the injection duct 11 of the blower fan and is fed into the cyclone 10 of the second stage. On the path from the cyclone 14 to the cyclone 10, the first stage of air heating is carried out, and on the path from the cyclone 10 to the cyclone 14, it is further heated. Both cyclones are therefore under pressure. The cooled slag is removed from the cyclone 10 through the slag removal 16.

Subject invention

Claims (2)

1. The method of using the physical heat of liquid slag boilers using compressed air (steam) as a heat carrier and heating the heat carrier by direct contact with a liquid slag stream, which is fragmented by a heat carrier, in order to possibly reduce the pressure of compressed air (steam) In order to increase the economics of the installation, the slag is crushed by a sharp, flat stream of air (steam), normally sent to the flowing stream of liquid slag. 2. To implement the method according to claim 1, use a multistep scheme for heating the air and sequentially switching on the cyclones in order to increase the efficiency of using slag heat.