SU669163A1 - Rotary furnace - Google Patents

Description

one

The invention relates to the production of building materials, in particular, rotary kilns for the firing of portland cement clinker, and can be used in the production of portland cement and based on it.

Rotary kilns for firing Portland cement clinker are known, including a cylinder with supporting stations and a drive, as well as fuel combustion devices located at one end of the kiln and feed supply units located at the other end of the kiln 1.

The closest technical solution to the invention is a rotary kiln for burning portland cement clinker, comprising a housing with supporting stations and an actuator, cylinders located in the decarbonization zone around the housing and connected to it by nozzles, and devices for burning fuel located in the discharge end furnace 2.

The disadvantage of this furnace is the remoteness of the combustion zone of the fuel from the zone of maximum heat consumption of the material in which decarbonization of the latter takes place, which leads to a decrease in heat transfer from the dust-gas stream to the decarbonized material.

The purpose of the invention is to intensify the burning process.

This goal is achieved by the fact that a rotary kiln for burning portland cement clinker, containing

0 a housing with supporting stations and a drive, cylinders located in the decarbonization zone around the housing and connected to it by nozzles, and devices for burning fuel located in the discharge end of the furnace, it is equipped with additional devices for burning fuel installed in the end of the output part of the cylinder ditch

The drawing shows a rotary kiln with a partial cut in the decarbonization zone.

In the housing 1 of the rotary kiln, additional cylinders 2 are planetaryly mounted between the support stations 5 and connected to the housing 1 by transition pipes 3 and 4. The furnace body 1 is lined with refractory bricks from inside, and the pipes 3 and 4 are made of heat-resistant

Claims (2)

0 steel. At the end of the output part of the cylinders 2 there are placed fuel combustion devices consisting of injection nozzles 5 and combustion chambers 6. Nozzle 5 of each cylinder 2 is connected to the fuel line 7 installed on the surface of the housing 1 through devices like swivel with a stationary fuel line and fuel management system. When the furnace rotates, the raw mixture is heated to 700-800 ° C through pipes 3 and spills into cylinders 2 and, moving along the slope, is heat-treated from the plume formed during the combustion of fuel in chamber 6. The temperature difference between the plume of the material is high (1500-800 ° C ) provides an intensive heat supply, rapid heating and decarbonization of the mixture. Separating the mixture into cylinders 2 dramatically increases the open surfaces of the material and, in turn, accelerates this process. Combustion air is taken from the environment due to the injection of the nozzles 5 and the dilution created by the flue exhaust fan. Fuel (liquid or gaseous) to the nozzles 5 is supplied from a stationary fuel line through a known device in the Swivel type. Products of fire pass through pipes 3 and 4 mixed with gases coming from the furnace sintering zone. Heated to 1000 ° C and the decarbonated furnace conversion mixture is discharged through nozzles 4. Next are the usual processes. Claims of a Portland cement clinker rotary kiln, comprising a housing with supporting stations and a drive, cylinders located in the decarbonation zone around the housing and connected to it by nozzles, and combustion devices located at the discharge end of the kiln, characterized by , in order to intensify the burning process, it is equipped with additional devices for burning fuel installed in the output cylinder of the cylinder. Sources of information taken into account during the examination 1. Boganov A. I. Pe chi cement industry, M., Mashinostroenie 1965, p. 77. 2. USSR author's certificate number 31372, cl. F 27 B 7/16, 1930.