SU1366834A1 - Furnace for heating and heat treatment of materials - Google Patents

Abstract

The invention relates to furnaces for heating and heat treating products. The aim of the invention is to increase the energy efficiency of the furnace. The furnace consists of two chambers - working and utilization. The working chamber of the fire is an arch with installed burner devices, side step bars and a working hearth. In the bottom of the working chamber on the longitudinal axis of the furnace there are intermediate wells of smoke removal, above which ceramic smoke collection cups are located. The utilization-Ts1 onna chamber, located under the working chamber, has the shape of a diffuser with expansion towards the main smoke outlet of the zirch channels. Installing smoke cups above the intermediate smoke exhaust wells reduces the temperature of the combustion products taken from the working chamber by 50–150 K, which leads to an increase in the energy efficiency of the furnace by 5–15%. 1 hp f-ly, 2 ill. (L

Description

Do

but

O5 00

SLE

four

The invention relates to furnaces with a straight-line movement of material by means of a conveyor and can be used in the construction materials industry, the metallurgical engineering industry, in particular for heat treatment of pipes and sheet materials, and in other engineering fields.

FIG. 1 shows a furnace, longitudinal axial section; in fig. 2 shows section A-A in FIG. 1 (along the axial plane of the burner, the smoke tube and the utilization chamber).

The furnace contains a body-cup 1, an obmurovanny fire-resistant brick, in which two chambers are located: working B and recycling C, the working chamber is limited by vault 2 with burner devices 3 installed in it, side walls 4 and working flue 5. The worker under 5 simultaneously performs the function of the vault of the utilization chamber B, which is formed by the above vault, the continuation of the side walls 4 and the lower base of the furnace 6. On the loading side of the furnace, the main chimney is located in the utilization chamber; and channels 7. Utilization chamber The ra has the shape of a diffuser with an extension towards the main smoke exhaust channels,

Distributed along the longitudinal axis of the vault of the utilization chamber B in the vault 5 there are filled intermediate wells 8 for smoke removal. Above the intermediate wells 8 of smoke removal, perpendicular to the horizontal axis, there are ceramic exhaust cups 9, height 1, which is determined from the ratio

 - 2,

where L is the distance from the bottom surface of the working chamber to the axis of the transport device lOj

 - burner crater diameter. Perpendicular to the arch 5 of the utilization chamber along the entire width of the working space of the furnace there are transverse vertical partitions 11, the upper cut of which is located with a gap relative to the transporting device.

The oven works as follows

R

0

five

0

five

0

five

0

five

On the conveyor 10 / in particular roller J, driven by electric motors installed behind the furnace, individually on each roller serves products subjected to heat treatment. As products move through the furnace, they are heated and heat treated.

The fuel is burned with burners 3, preferably flat flame. At the same time, an open fan-shaped flow of combustion products and a continuous flow past the roof 2 and side walls 4 of the working chamber B. The heated arch and side walls of the working chamber are the main sources of heat transfer by radiation from above to the metal surface. In addition, by recirculating the gases in the working chamber of the factory, they also provide convective heating of the upper surfaces of the blanks.

Further, the combustion products fall under the rollers, continuously wash the outer surface 5 of the utilization chamber B and enter the smoke extraction cups 9. During this movement, the combustion products heat the surface of the roof 5, which becomes a source of heat transfer to the heated products from below. In addition, the convective transfer of heat to the heated products from below is also carried out. I

Installing smoke cups 9 above intermediate wells 8 smoke removal prevents the discharge of combustion products into the utilization chamber from the wall gas layer washing the surface of the roof 5, where the combustion products have a sufficiently high temperature potential. The products of combustion get into the utilization chamber from the working chamber from the area where the temperature of the combustion products is 50-150 K lower than in the wall layer. This increases the degree of heat utilization in the working space of the furnace (excluding losses), which contributes to an increase in the energy efficiency of the plant as a whole.

The increase in energy efficiency is also influenced by the shape of the utilization chamber made in the form of a diffuser. It is this form that ensures equal pressure in the working space of the furnace, and the installation of transverse partitions 11 separating the areas of automatic temperature control improves the overall quality of regulation, In this case, overflows of combustion products from furnaces with different temperature levels are excluded.

The invention provides an economic effect by reducing fuel consumption and improving the quality of metal heating.

Claims (1)

1. Furnace for heating and heat treatment of materials, comprising a housing, a working chamber formed by a vault with flat-flame burners, side walls and hearth, a utilization chamber limited by a vault, whose functions are located under the working chamber ,, and the base of the furnace, is a transporting device , gas and air collectors, transverse partitions, main smoke removal channels, pipelines Comminution smoke exhaust wells made in the roof of the scrapping chamber are different. The reason is that in order to power the energy QDT in the working chamber above the intermediate smoke removal wells there are smoke-collecting cups with a height determined from the ratio L / d, - 2 1 / d, L / d, chr CR where 1 - the height of the smoke cup;  - diameter of the burner's crater; L, - distance from the floor of the working chamber to the axis of the transporting device, and a diameter equal to the diameter of the inlet of the smoke well, 2, the furnace according to claim 1, characterized in that the number of smoke-selected glasses is equal to the number of gas collectors feeding the pipelines of the burners. Voz1}) (