RU155526U1 - ORE AGGLOMERATION DEVICE - Google Patents

Abstract

A device for sintering metal-containing materials, such as, for example, iron ores or manganese ores, in particular oxide or carbonate ores, on an agglomeration machine (1), comprising- a device (2) for loading an agglomeration charge containing solid fuel (3) onto an agglomeration belt (4), - suction ducts (5) for passing an oxygen-containing process gas through the sinter charge in three successive sections of the sinter belt, of which the first section adjoins the loading device and, and the third section is limited by the discharge end (6) of the sinter belt (4), a collection pipe (7) for combining and transferring the sinter gas that accumulates in the suction boxes (5) of the third section and in the suction boxes (5) of the first section, - a discharge pipe (8) for combining and transferring the waste agglomeration gas accumulating in the suction ducts (5) of the second section, - a return device (9) for transporting and distributing the waste agglomeration gas as at least a portion the process gas to the sinter charge on the sinter belt (4), preferably to the sinter charge in the second section of the sinter belt (4), an exhaust gas pipe (10) for discharging the sinter gas from the sinter machine (1), characterized in that - a return device (9) and - a pipeline (10) for the exhaust gas is connected by a pipe connection to a collection pipe (7) and to a discharge pipe (8), while in the collection pipe (7) and in the discharge pipe (8) there are switching devices

Description

FIELD OF TECHNOLOGY

The solution relates to a method and apparatus for the agglomeration of metal-containing materials, such as, for example, iron ores or manganese ores, in particular oxide or carbonate ores, on an agglomeration machine with recirculation of the waste agglomeration gas.

BACKGROUND

Agglomeration of metal-containing materials, such as, for example, iron ores or manganese ores, in particular oxide or carbonate ores, is carried out by sintering machines. After loading the sinter charge, which consists of a metal-containing material, a circulating product, solid fuel, additives, etc., onto the sinter belt of the sinter machine, the sinter charge is ignited in the incinerator along its surface. Then, oxygen-containing gases as a process gas are directed through the sinter charge, as a result of which the agglomeration front from the surface of the sinter charge moves in the direction of the surface of the sinter belt. The gases used as the process gas are, for example, fresh air, exhaust air from an agglomerate cooler, air used for pre-drying the sinter charge, a mixture of several of these gases, or a mixture of one or more of these gases with technical oxygen. In this case, the sintering belt moves from the loading point towards the discharge point. During transportation on the sinter belt, the entire sinter mixture is sintered and leaves the sinter belt in the form of a hot finished sinter. The hot finished agglomerate is cooled in a subsequent agglomerate cooler. Agglomeration machines can, for example, be made in the form of agglomeration machines with a grate, in which the process gas is sucked in through the sinter charge, and by means of blowers, a vacuum is applied to the suction boxes under the sinter belt.

Along the agglomeration belt in normal mode, the temperature and oxygen content of the accumulating sinter gas are changed. The temperature of the waste sinter gas along the sinter belt increases. The oxygen content of the off-sinter gas along the sinter belt is first reduced to rise again after reaching a minimum. Typically, the temperature of the off-gas sinter gas in the front first portion of the sinter belt is less than 100 ° C and rises towards the rear portion to more than 300 ° C.

By means of suction boxes located under the sinter belt, the process gas is sucked through the sinter charge, and the waste sinter gas resulting from its passage is collected and discharged. Since the sintering process requires large quantities of process gas, large quantities of waste sinter gas are formed. The sinter gas contains, in particular, evaporated water from the sinter charge, CO ₂ and CO from partially incomplete combustion of the fuel and calcining processes, as well as from the combustion of sulfur oxides SO _X contained in fuel or sulfur ore, as well as nitrogen oxides NO _X , dioxins, furans, dust. Therefore, before the sinter gas in the form of sinter gas can be discharged into the environment, harmful substances must be removed to minimize environmental pollution. Reducing the amount of exhaust gas that must be removed from the sintering machine, or, accordingly, the concentration of harmful substances contained in the exhaust gas facilitates the purification of the exhaust gas.

It is already known to reduce the amount of exhaust gas and the concentration of harmful substances contained in the exhaust gas due to the fact that part of the waste sinter gas in the form of a process gas is returned to the sinter charge. Due to this, on the one hand, the amount of process gas introduced externally into the sintering machine is reduced, and on the other hand, the oxygen contained therein is better used.

For example, in WO 2007/082694, the sinter gas from the start region and the end region of the sinter belt is combined in a collection pipe and returned to the middle region of the sinter belt, after which the sinter gas from the middle region is removed from the process through the outlet pipe. The corresponding suction ducts flow into the collection pipe or, respectively, the outlet pipe. The withdrawal of the waste agglomeration gas from the initial region or the end region, or the return of the exhaust agglomeration gas from the middle region is not possible completely. Accordingly, the installation is designed to recycle the sinter gas from the middle region.

Altered process conditions, such as, for example, other raw materials, or altered legal regulations may, however, result in it becoming desirable to recycle the sinter gas from the middle region in order to maintain the lowest possible SO _X content of the sinter gas to be discharged.

SUMMARY OF THE DECISION

TECHNICAL TASK

The objective of this solution is to provide a device that will provide an opportunity for more flexible than in the prior art, operation with respect to the source of the returned sinter gas.

TECHNICAL SOLUTION

This problem is solved by

devices for sintering metal-containing materials, such as, for example, iron ores or manganese ores, in particular oxide or carbonate ores, on an agglomeration machine,

- having a device for loading a solid fuel-containing sinter charge onto the sinter belt,

- having a suction box for passing an oxygen-containing process gas through the sinter charge in three successive sections of the sinter belt, of which the first section is adjacent to the loading device, and the third section is limited by the discharge end of the sinter belt,

- having a collection pipe for combining and transferring off-gas sinter gas that accumulates in the suction ducts of the third section and in the suction ducts of the first section,

- having a discharge pipe for combining and transferring off-gas sinter gas accumulating in the suction ducts of the second section,

- having a return device for transporting and for distributing the sinter gas as at least a portion of the process gas to the sinter charge on the sinter belt, preferably to the sinter charge in a second section of the sinter belt,

- having a pipeline for exhaust gas to exhaust the sinter gas from the sinter machine,

characterized in that

- return device

and

- pipeline for exhaust gas

connected by piping to

- prefabricated pipeline

and

- discharge pipe,

wherein

in the prefabricated pipe and in the discharge pipe

there are switching devices designed to direct the sinter gas to be routed in a collection pipe or, respectively, in a discharge pipe,

or

to the return device

or

into the pipeline for exhaust gas.

Oxygen-containing process gas is guided through the sinter charge, and by means of blowers, a vacuum is applied to the suction boxes under the sinter belt. Due to this, the process gas is sucked through the sinter charge into the suction ducts.

PREFERRED EFFECTS

The distribution of sections is carried out so that the amount of sinter gas off-gas is reduced to a minimum, and the returned sinter gas off in normal mode, if necessary after adding the exhaust air from the sinter cooler and / or fresh air and / or air used for pre-drying the sinter charge, and / or technical oxygen to the mixed gas, has a certain temperature and a certain oxygen content. The minimum temperature is 90 ° C, preferably 100 ° C, and usually the maximum temperature is up to 150 ° C, preferably 130 ° C. The lower limit of the oxygen content is 13 volume%, preferably 17 volume%, but oxygen contents of up to 20 volume% or higher are also possible.

With this temperature, a low risk of corrosion in the flow parts of the installation is maintained. With this oxygen content, good agglomeration quality is ensured. Preferably the highest possible oxygen content.

Depending on the process parameters, such as, for example, the agglomeration belt speed, the composition of the agglomeration charge, the oxygen content of the process gas, the thickness of the agglomeration charge layer on the agglomeration belt, the permeability of the agglomeration charge, vacuum applied to the vacuum boxes, the amount of process gas passed, the proportion of each section in the total length of the agglomeration tape varies within certain limits.

The first section of the agglomeration tape usually occupies 20-60% of the length of the agglomeration tape, preferably 30-50%. Adjacent to the first section, the second section of the sintering belt typically occupies 30-60% of the length of the sintering belt, preferably 40-50%. Adjacent to the second section of the sintering belt, the third section of the sintering tape usually occupies 5-20% of the length of the sintering tape, preferably 10-15%.

With appropriate distribution, the sinter gas and, at the same time, the process gas for the second section in the normal mode, respectively, have the desired temperature and oxygen content.

In the collection pipe, the sintering gases accumulating in the suction ducts of the third section and the suction ducts of the first section are combined and discharged from the sintering belt.

In the discharge pipe, the sintering gas accumulated in the suction ducts of the second section is combined and discharged from the sintering belt.

In the exhaust gas pipe, sinter gas is discharged from the sinter machine.

The return device serves to transport and distribute the waste sinter gas as at least a portion of the process gas to the sinter charge on the sinter belt.

Return and distribution can be carried out on one or more sections of the sinter belt.

Preferably, it is configured such that at least to the sinter charge in the second section of the sinter belt, the waste sinter gas is transported as at least a portion of the process gas and distributed to the sinter charge on the sinter belt.

Preferably, not all of the sinter gas is returned, but only a fraction. Preferably, up to 50% of the sinter gas is returned. If necessary, oxygen is added to the returned sinter gas, for example, by adding cooling air from an sinter cooler connected to the sinter plant.

In accordance with the Decision, the return device and the exhaust gas pipe are connected to the collection pipe and the discharge pipe so that the sinter gas from the collection and discharge pipe can be introduced into the return device and into the exhaust gas pipe. In order to be able to carry out a controlled alternation of the input of the waste sinter gas into the return device and the input to the pipe for the exhaust gas, there are switching devices in the collection pipe and in the discharge pipe. These switching devices are designed to direct the sinter gas to either the return device or the flue gas line.

By appropriately adjusting the switching devices, it is possible to choose whether the waste sinter gas will be discharged from the second section from the sintering machine and from the first and third sections to return to the sinter belt, or whether it will return from the second section to the sinter belt and from the first section and the third section from sinter machine. Thus, it is possible to flexibly respond to changed raw material conditions and requirements for exhaust gas.

Switching devices are, for example, dampers or valves.

According to preferred embodiments, at least a collection line and a discharge line are provided with gas treatment plants; for example, dedusting plants or installations for the removal of NO _X and SO _X.

Dust removal plants emit dust from the mixed gas or, correspondingly, off-gas. Separated dust can, as far as technologically possible, be reused in the production of the sinter mixture.

BRIEF DESCRIPTION OF THE DRAWING

The solution is explained below using a schematic, exemplary, figure.

FIG. 1: a schematic flow diagram of a device proposed by the Solution.

DESCRIPTION OF EMBODIMENTS

In FIG. 1 shows a schematic flow diagram of a device for agglomerating metal-containing materials, such as, for example, iron ores or manganese ores, in particular oxide or carbonate ores, on an agglomeration machine 1,

- having a device 2 for loading containing solid fuel sinter charge 3 on sinter tape 4,

- having a suction box 5 for passing oxygen-containing process gas through the sinter charge in three successive sections of the sinter belt, of which the first section is adjacent to the loading device, and the third section is limited by the discharge end 6 of the sinter strip 4,

- having a collection pipe 7 for combining and transferring the sinter gas that accumulates in the suction ducts 5 of the third section and in the suction ducts 5 of the first section,

- having a discharge pipe 8 for combining and transferring the sinter gas that accumulates in the suction ducts 5 of the second section,

- having a return device 9 for transporting and for distributing the waste sinter gas as at least a portion of the process gas to the sinter charge on the sinter belt,

- having a pipeline 10 for off-gas to exhaust the off-sinter gas from the sinter machine.

The return device 9 and the exhaust gas pipe 10 are connected by a pipeline connection to the collection pipe 7 and the discharge pipe 8. There are switching devices 11, 12 in the collection pipe 7 and in the discharge pipe 8. These devices are designed to direct the sinter gas to be sent to the collection pipe 7 or, respectively, in the discharge pipe 8, or in the return device 9, or in the pipe 10 for the exhaust gas. Shown are switching devices 11, 12 in the form of three-way valves. In the image of the area framed by the dash-dotted line, the switching device 11 is configured so that the sinter gas from the collection pipe 7 is returned to the sinter belt, and the sinter gas from the exhaust pipe 8 is sent to the exhaust gas pipe 10. In another image of the area framed by the dot-dash line, the switching device 11 is configured so that the sinter gas from the exhaust pipe 8 is returned to the sinter belt, and the sinter gas from the collection pipe 7 is sent to the exhaust gas pipe 10. In the collection pipe 7 and the discharge pipe 8 there are dedusting plants 13, 14.

The supply of oxygen to the returned sinter gas, for example, by supplying cooling air of a sinter cooler not shown, is not shown separately for purposes of clarity.

Although the Solution has been illustrated and described in more detail in the preferred embodiments, the Solution is not limited to the disclosed examples, and the specialist can infer other options from this without departing from the scope of protection.

LIST OF REFERENCE NUMBERS

1 Agglomeration machine

2 boot device

3 Agglomeration charge

4 Agglomeration tape

5 Suction boxes

6 discharge end

7 Prefabricated pipeline

8 discharge pipe

9 Return device

10 Pipeline for exhaust gas

11 switching device

12 switching device

13 Dust removal plant

14 Dust removal plant

LIST OF USED SOURCES

Patent Literature

WO 2007/082694

Claims (1)

A device for agglomeration of metal-containing materials, such as, for example, iron ores or manganese ores, in particular oxide or carbonate ores, on an agglomeration machine (1) containing - a device (2) for loading an agglomeration charge containing solid fuel (3) onto an agglomeration belt (4), - suction boxes (5) for passing oxygen-containing process gas through the sinter charge in three successive sections of the sinter belt, of which the first section is adjacent to the loading device, and the third section is limited by the discharge end (6) of the sinter belt (4), - a collection pipe (7) for combining and transferring off-gas sinter gas accumulating in the suction ducts (5) of the third section and in the suction ducts (5) of the first section, - a discharge pipe (8) for combining and transferring off-gas sinter gas accumulating in the suction ducts (5) of the second section, - a return device (9) for transporting and distributing the sinter gas as at least a portion of the process gas to the sinter charge on the sinter belt (4), preferably to the sinter charge in the second section of the sinter belt (4), - pipeline (10) for exhaust gas to exhaust the sinter gas from the sinter machine (1), characterized in that - return device (9) and - the pipeline (10) for the exhaust gas is connected by a pipe connection to - prefabricated pipeline (7) and - discharge pipe (8), wherein in the collection pipe (7) and in the discharge pipe (8) there are switching devices designed to direct the sinter gas to be routed in the collection pipe (7) or, respectively, in the discharge pipe (8), or to the return device (9), or into the pipeline (10) for the exhaust gas.