JPS5838784A - Device for improving gas flow process which flows into combustion space of industrial gas burning furnace, particularly coke oven - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The subject of the original patent is an industrial gas furnace, in particular a coke oven, in which heat is recovered from combustion waste gas by heat storage or recuperation, in which the gas reaches the combustion space of a coke oven through a transition passage. A gas flow through which the preheated combustion medium, such as air in the case of rich-gas firing, and air and lean gas in the case of lean-gas operation, is introduced into the flue from the outlet of the heat exchanger through the transition passage of It is a device that improves processes. In this device, in place of the normally existing flue bottom, an inlet bottom is provided that is slightly thicker than the flue bottom and has a plurality of preferably cylindrical holes;
The free space below this inlet bottom is divided gas-tightly into two half-spaces by a centrally mounted refractory bridging piece, into which a transition passage leads in each case.

In the device forming the subject of the original patent, it is assumed that the combustion air or, in the case of lean gas heating, enters the combustion space exclusively from the flue bottom. The feed channel introducing the medium into the combustion space is constructed in such a way that, in the case of combustion air or lean gas heating, the combustion air and lean gas reach the flue at different heights, as is customary in other heating devices. If so, different mass flows per unit time can be allowed to enter through both inlet openings at the bottom of the flue. In this case, the results of flow experiments show that the weaker mass flow is attracted by the stronger mass flow and the effect of the inflow bottom, ie the orientation of the medium entering from the regenerator, is partially lost. An object of the present invention is to avoid this.

As a result of the experiment, we found the following. That is, the unfavorable effects of the medium flowing into the flue can be prevented by the free space below the inlet bottom, which can be prevented by appropriately arranging the refractory bridging piece.
The sum of the exit cross-sectional areas of multiple holes opening into one space, the sum of the exit cross-sectional areas of multiple holes opening into the other space, and the p ratio are:
This can easily be avoided by dividing the two spaces in such a way as to match the ratio of the mass flow rates supplied to the individual spaces via the transition passages leading to these spaces.

If the masses flowing into the individual spaces per unit time are different, according to the invention the inflow base is divided asymmetrically in a suitable manner by bridging pieces.

A preferred embodiment of the invention is shown in the drawing.

Two transition channels 2 and 3 leading to the lower part of the flue 1 of the coke oven connect a regenerator (not shown) provided under the regenerator cover to the individual flue 1 . As usual, the transition passages 2 and 3 consist of an obliquely upward-rising section and a section that extends vertically and opens at the bottom of the flue 1. In the case of gas-rich operation of the coke oven, preheated air is supplied via both transition passages 2 and 3 to the corresponding flue l; in the case of gas-lean operation, the air is supplied via one transition passage. is introduced into the flue, and lean gas is introduced through the middle and side transition passages.

Instead of the normally present flue bottom, an inflow bottom 4 is provided which is formed slightly thicker than the flue bottom, so that a free space 5 remains between the inlet of the transition passages 2 and 3 and the underside of the inflow bottom 4. is incorporated into. According to the invention, this free space 5 is divided by an airtight fireproof bridging piece 6 into two spaces of different sizes. As in the original patent, the ratio of the height a of the free space 5 to the thickness L of the inlet bottom 4 is 0.3 to 0.7 (0.5).

The inlet bottom 4 has a number of cylindrical holes 7, which are arranged above both halves of the free space 5. Inflow bottom 4
The ratio of the cross-sectional area of the hole 7 to the cross-sectional area of the individual cylindrical holes 7 is preferably between 20 and 200, preferably between 30 and 60. Furthermore, according to the invention, the diameter of the individual cylindrical holes is between 10 and 60 mm, preferably between 20 and 50 mm.
It is. Via a nozzle burner, designated 8 in the drawing,
During gas-rich operation, rich gas is introduced into the flue 1.

The division of the inflow bottom 4 or the division of the free space 5 by the bridging pieces can be carried out, for example, by the following embodiment.

The flue of a combined furnace is such that 50% of the combustion air enters through one transition passage and 1% of the combustion air enters through the other transition passage.
The arrangement shall be such that 5% enters and the remainder is supplied through a passage in the joint or through an outlet opening at a height of 2.5 m from the flue bottom. Therefore, the ratio of the amount of air flowing in through the transition passage at the bottom is 5
It was 0:15.

Depending on this ratio, the free space 5 below the inlet bottom 4 is moved by the bridging piece 6, and the ratio of the sum of the exit cross-sections in one space to the sum of the exit cross-sections in the other space also changes. 50:
15.

4. In the additional related original patent, instead of the flue bottom normally present in the flue 1, an inlet bottom 4 formed slightly thicker than the flue bottom is provided, and the inlet of the transition passages 2 and 30 and the flue bottom are provided. It is assembled so that a free space 5 remains between it and the lower surface, and this free space 5 is divided into half spaces by an airtight fireproof bridging piece 6.

In the present invention, the free space 5 under the inflow bottom is opened to the sum of the exit cross-sectional areas of the plurality of holes 7 that open to one space and the other space by appropriately arranging the fireproof bridging pieces 6. divided into two spaces such that the ratio of the sum of the exit cross-sectional areas of the plurality of holes 7 corresponds to the ratio of the mass flow rates supplied to the individual spaces via the transition passages leading to these spaces. By this, undesirable effects of the medium entering the flue 1 are easily avoided.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of a device according to the invention, and FIG. 2 is a plan view thereof. l... Flue, 2, 3... Transition passage, 4... Inflow bottom, 5... Free space, 6... Bridging piece, 7... Cylindrical hole, a... Free Height of space, L... Thickness of inflow bottom Patent applicant Dr. C. Otsto & Company Gesellschaft Mitsut Beschrenktel Hufsung Figure 1 □ --? Gu/8

Claims (1)

[Claims] Industrial gas-fired furnaces in which heat is recovered from combustion waste gas by heat storage or recuperation The preheated combustion medium, and in the case of lean gas operation air and lean gas, is introduced into the flue through the outlet of the heat exchanger, forming a slightly thicker flue bottom instead of the normally present flue bottom. an inflow bottom having a plurality of holes, preferably cylindrical in shape, is provided, and the free space under this inflow bottom is airtightly divided into two spaces by a refractory bridging piece;
In the device for improving the gas flow process, in which one transition passage leads into each of these spaces, the free space (5) below the inlet bottom (4) is provided with a refractory bridging piece (6) in place. As a result, the ratio of the sum of the exit cross-sectional areas of the plurality of holes (7) opening into one space and the sum of the exit cross-sectional areas of the plurality of holes opening into the other space becomes Device for improving the gas flow process, characterized in that it matches the ratio of the mass flow rates supplied through the connected transition passages.