TW201508225A - Method for operating a multi-gas burner and a multi-gas burner - Google Patents

Abstract

The invention relates to a method for operating a multi-gas burner having at least one burner lance with a first, second and third nozzle and having a first, second and a third feed chamber. It is provided according to the invention that for high-calorific operation air is fed via the first nozzle, O2-depleted gas via the second nozzle and the high-calorific combustion gas via the third nozzle into the combustion chamber, where they are combusted. Furthermore the invention relates to a multi-gas burner for operation with a low-calorific and a high-calorific combustion gas.

Description

Method for operating a multi-gas burner and multi-gas burner

This invention relates to a method for operating a multi-gas burner and a multi-gas burner operating with low heat and high heat combustion gases.

A typical multi-gas burner has in most cases a combustion chamber and at least one burner lance. The burner spray gun is designed with first, second and third nozzles. Furthermore, the first, second and third feed chambers are arranged in their respective fluid communication to respective nozzles for feeding gas into the combustion chamber. The nozzles of at least one burner lance terminate in a combustion chamber on one side and terminate in a respective feed chamber on the other side. Furthermore, a burner muffle is placed in the end region of the nozzle in the combustion chamber. A burner having a plurality of burner lances is described as a multi-lance burner.

Typical burners are known, for example, from DE 196 27 203 C2 and DE 42 08 951 C2.

Such gas burners are suitable for use in hot gas generators for heating process gases, for example in the context of smelting iron ore. The heat treatment gas is required for the grinding and drying process of coal. The ground and dried coal is additionally used in the smelting of iron ore. As a combustion gas for a hot gas generator, in general, a low-heat gas (also described as a lean gas) is fed into a combustion chamber through a nozzle together with an oxygen carrier for combustion (in particular, air), wherein the low-heat gas It is then mixed with the oxygen carrier, ignited and burned.

In order to increase the flexibility and availability of the hot gas generator, it is desirable to be able to operate the burner of the hot gas generator instead of other combustion gases such as high heat combustion gases.

Due to the higher calorific value of the high heat combustion gas, the high heat combustion gas burns at a higher flame temperature than the low heat gas. In that, the combustion at a temperature above about 1300 ℃ of the action, for (in particular normal air) N ₂ in the thermal conversion takes place combustion of the oxygen carrier to form NO _x. When high heat combustion gases are used, the combustion temperature typically exceeds this critical temperature range. However, according to environmental regulations, must be widely avoid the formation of NO _x.

Accordingly, it is an object of the present invention to indicate a method for operating a multi-gas burner and such a multi-gas burner that, in combination with a coal grinding apparatus, can combust a high-heat combustion gas while simultaneously Comply with applicable environmental protection regulations.

According to the invention, this object is achieved by a method for operating a multi-gas burner having the features of claim 1 and a multi-gas burner having the features of claim 10 of the patent application.

Other advantageous specific examples are indicated in the dependent items, the description and the drawings.

According to the first aspect of the patent application, a multi-gas burner has at least one burner lance having first, second and third nozzles, having first, second and third feed chambers each in fluid communication with a respective nozzle, And having a combustion chamber into which at least one burner lance extends, the multi-gas burner being operated in such a manner that high-heat operating air is introduced into the combustion chamber through the first nozzle, and at the same time O ₂ consumed gas is introduced into the combustion through the second nozzle In the chamber, the hot combustion gases are introduced into the combustion chamber through a third nozzle which reacts in the combustion chamber, in particular combustion, air and O ₂ depleted gas as oxygen supply or oxygen carrier for combustion.

Cognitive according to the present invention, in order to avoid NO _x formation, the flame temperature needs to be reduced, so that it is lower than the maximum amount of NO _x range. This temperature range is below about 1300 °C.

This can be achieved in accordance with the present invention because the combustion is carried out at an elevated lambda value compared to a low thermal operation (i.e., combustion of a low hot combustion gas). The lambda value is also described as the ratio of combustion to air and is defined as the oxygen provider (detailed air) and combustion provided to the combustion. The ratio of the minimum air stoichiometry necessary to burn the gas.

If the combustion is carried out in the case of more hot gases, in the case of more combustion air, and thus in the case of a larger amount of oxygen supply for combustion, the lambda value increases. By additionally introducing more combustion air, the generated gas is cooled in the event that the combustion gases are completely combusted. This ensures that the entire combustion process occurs for less than the critical temperature of the NO _x generating temperature range.

Ordinary ambient air having an oxygen content of about 21% is conventionally known as an oxygen provider for combustion. The amount of oxygen in the heat treatment gas is increased due to the higher amount of oxygen supply for combustion. This is problematic especially when a gas burner is used in a hot gas generator for producing a process gas for use in a coal grinding apparatus. Such coal milling equipment is used, for example, for processing carbon carriers such as hard coal, for blowing into blast furnaces using pulverised coal injection (PCI) processes, or for use in coal gasification plants. In such equipment, the oxygen content of the process gas must be less than 10% for explosion protection purposes. Therefore, it is impossible to promote the use of high heat combustion gas by increasing the value of λ. In the case where many process gases are used in an explosion risk environment, the same problem exists. Thus, when using heat of combustion gas is not only necessary to prevent NO _x, and the heat treatment necessary to ensure that the oxygen content of the gas generated by the process is determined depending on less than the percentage content.

Another core idea of the present invention can thus be seen in the incomplete use of ordinary air as the oxygen provider for combustion, and instead the oxygen provider for combustion is mixed with normal air and O ₂ depleted gas. This allows the oxygen supply for combustion to have a lower overall oxygen content than normal air. Here, the burner can be operated with a higher lambda value to contribute to the above-mentioned necessary reduction in flame temperature. However, by reducing the oxygen content of the oxygen supplier thus used for combustion, it is still ensured that the process gas produced has a reduced oxygen content, in particular less than 10% oxygen content, so that the process gas can be used, for example, for coal milling. In the device.

The invention will be explained below using illustrative specific examples and schematic illustrations. 1 shows a simplified structure of a multi-gas burner according to the present invention; and FIG. 2 shows a process diagram of a coal grinding apparatus having a multi-gas burner according to the present invention.

According to an advantageous embodiment of the method, during low heat operation, air is fed as a combustion oxygen provider through the first nozzle into the combustion chamber, and the low hot combustion gas is simultaneously fed into the combustion chamber through the second nozzle, the gases being combusted The reaction in the chamber, in detail, burns. Here, in the case of low-heat combustion gases and high-heat combustion gases, the multi-gas burners can be operated and it is not necessary to provide separate burners for each of these modes of operation.

This configuration is based on the use of nozzles used in low heat operation of low heat combustion gases in high heat operation. This nozzle can thus be used to blend O ₂ depleted gas into the air from the first nozzle to obtain an oxygen provider for combustion. An advantage of this approach over providing another nozzle for O ₂ depleted gas is that the burner lance used in the embodiment herein only needs to have three and not four nozzles. In particular, this reduces the construction depth and constructional size of a multi-gas burner comprised of one or more such burner lances.

If the nozzle other than the burner lance is selected as the first nozzle, the center nozzle of the burner lance is used as the second nozzle, and the nozzle inside the burner lance is preferably the third nozzle. Through the outer nozzle, air can thus always be blown into the combustion chamber regardless of low heat or high heat operation. During the low heat operation, the combustion gas is blown through the center nozzle so that the combustion gas is surrounded by the blown air after being blown out of the nozzle, and can be effectively mixed and reacted therewith. Similarly, this is also the case in high heat operation where the inner nozzle is used to blow in hot combustion gases. By using a central nozzle for O ₂ depleted gas, it is possible here to inject high-heat combustion gas through the inner nozzle to effectively mix with the oxygen supplier for combustion composed of air and O ₂ depleted gas.

The combustion of the low heat combustion gas is preferably carried out with a lambda value in the range of from about 1.05 to about 1.2. Due to the low calorific value between 2000 kJ/m _N ³ and 4000 kJ/m _N ³ , the combustion temperature is below 1300 °C. As noted above, during high heat operation, the multi-gas burner must be operated at a higher lambda value to achieve the need to reduce the flame temperature. The lambda value is in the range of from about 1.5 to about 2.0, depending on the calorific value of the hot gas used. For example, when the coke combustion gases, preferably about 1.6 [lambda] value, where oxygen for the combustion of between 15% and 30% O ₂ for the provider of depleted gas.

In order to promote the use of process gases generated in coal milling equipment or other explosive critical processes, the lambda value in low heat operation and the lambda value in the high heat operation and the mixture of O ₂ spent gases are set such that the heat treatment gas generated ( Also described as hot gas) has an O ₂ content of less than 10%. For the needs of the explosion protection policy, the O ₂ content of the lower target value in the heat treatment gas can also be achieved by the corresponding adaptation of the O ₂ spent gas blending.

In low heat operation, this can be achieved without substantial resources via relatively low combustion values of the low heat combustion gases.

In high heat operation, depending on the selected lambda value, in this aspect, it is necessary to mix well in the O ₂ spent gas as part of the oxygen provider for combustion. The exact ratio of air to O ₂ depleted gas in the oxygen carrier for combustion depends essentially on the highly hot combustion gases used and the lambda values subsequently used. It is also possible here to achieve that the oxygen content of the process gas produced is well below 10%.

Further, the amount of the composition of the combustion gases, the value of [lambda] O _2, and air depleted of oxygen for the combustion gases of the provider may be set so that the flame temperature measurement does not exceed a value of about 1300 ℃. The lambda value is here essentially determined by the amount of combustion gas (i.e., the volume of fluid per unit of time) and the amount of oxygen supplier for combustion, since the oxygen supplier for combustion does not react with the combustion gases. The ratio helps to cool and lower the flame temperature.

According to an advantageous embodiment of the method, for example from a grinding and drying process, in particular a recycle process gas from a coal milling plant is used as the O ₂ depleted gas. In the case of a grinding operation of a carbonaceous solid fuel by air transport, for example, in the case of an air-swept vertical roller mill, it is necessary to use a gas having an oxygen content of less than 10% as a processing gas. Here, a so-called grinding and drying process is often carried out in which the coal to be ground or another starting material is dried in addition to being reduced in size. In this regard, as already stated, a heat treatment gas is required, but due to explosion protection reasons, its oxygen content must be less than 10%. These process gases can be converted from a grinding operation to an O ₂ depleted gas for operation of a multi-gas burner. When the heat treatment of the gas produced by the gas burner for a multi-drying grinding operation, which is then fed back to the polishing process, so that the O ₂ completely depleted process gas is removed from the polishing process. It is of course also possible to use O ₂ depleted gases from other sources.

According to an advantageous embodiment, the coker gas is used as a high heat gas and the blast furnace gas is used as a low heat gas. Coal milling equipment having a hot gas generator constructed from a multi-gas burner is often used in the context of ore preparation and processing, such as a smelting process. The blast furnace gas system is produced at the upper edge of the blast furnace, and the blast furnace gas can be used as an advantageous fuel for the operation of the grinding and drying and burners. Any combustion gas such as synthesis gas, coke gas or natural gas can be used as the high heat combustion gas. Low heat gases can also be described as lean gas, and high heat gases can be described as rich gases. When referring to air within the scope of the present invention, it is to be understood that this generally means that ambient air has an oxygen content of about 21%. Gases added to the combustion gases within the scope of the combustion process are described within the scope of the invention as oxygen providers for combustion. Alternatively, the oxygen carrier or provider for combustion may also be described as combustion air.

Within the scope of the present invention, the low heat gas can be regarded as a gas having a combustion value or a calorific value in the range of about 2,000 to 4,000 kJ/m _N ³ , and the hot gas can be regarded as a combustion value or a calorific value of about 10,000 to 40,000 kJ/m. Gas in the range of _N ³ . For the purposes of the present invention, it is not entirely important for the low heat and high heat gases to have a combustion value, but the high heat gas has a higher combustion value than the low heat gas.

The invention further relates to a multi-gas burner operating with low heat and high heat combustion gases. In this aspect, a typical combustor has a combustion chamber, at least one burner lance having first, second, and third nozzles having first, second, and third feed chambers, each of which is in fluid communication with a respective nozzle In order to feed the gas into the combustion chamber, wherein the nozzle terminates in the combustion chamber at one end and ends in the respective feed chamber at the other end, and the combustion chamber has a burner muffle in the end region of the nozzle, the burner is further developed The first feed chamber is designed to feed an oxygen provider for combustion. The second feed chamber is designed to feed low heat combustion gases and O ₂ depleted gas. The third feed chamber is designed to feed high heat combustion gases. In addition, the feed unit is provided for feeding low heat combustion gases and O ₂ spent gas to the second feed chamber. The feed unit is designed to introduce a low hot combustion gas or O ₂ depleted gas into the second feed chamber depending on the mode of operation of the multi-gas burner.

In the case where the general burner lance has at least three nozzles, in most cases, the nozzle of the oxygen provider for combustion and the second nozzle for the first combustion gas are used in the first operation, and third The nozzle is used in a second operation for the second combustion gas and the first nozzle of the oxygen provider for combustion. According to the present invention, it is considered that in the combustion of a high-heat gas, it is necessary to operate the multi-gas burner in the case of increasing the λ value as compared with the low-heat operation, and therefore, in order to maintain the maximum oxygen content of the heated process gas, it is required to be in the air. The mixed O _{2 is} depleted of gas, and it is considered herein that the second nozzle of the burner lance is not used during high heat operation compared to during low heat operation, and thus this can exhibit a dual function. This dual function can be seen in feeding low heat combustion gases in low heat operation and feeding O ₂ spent gas in high heat operation.

Compared to the use of four nozzles, each nozzle achieves only a single function, which has the advantage that the multi-gas burner according to the invention has a smaller construction size, saves space and investment costs, and can be used more flexibly. Since the construction of the burner lance with four nozzles requires more resources than the use of a burner lance with three nozzles, material costs and expenses can also be saved.

A burner lance having three nozzles may have an outer tube, a center tube, and an intermediate tube disposed between the outer tube and the center tube. The pipes are coaxially oriented relative to each other and are mutually Arranged to form an annular gap or fluid cross section. Thus, the burner is constructed from three mutually coaxially inserted conduits to connect the resulting fluid cross sections to separate feed chambers. An annular gap is formed between the outer tube and the intermediate tube to form an outer nozzle, an annular gap between the intermediate tube and the central tube forms a central nozzle, and the central tube forms an inner nozzle.

According to a specific embodiment of the invention, the first nozzle is a nozzle outside the burner lance, the second nozzle is a central nozzle of the burner lance, and the third nozzle is a nozzle within the burner lance. It is additionally limited to the first nozzle being fluidly connected to the first feed chamber, the second nozzle being connected to the second feed chamber, and the third nozzle being connected to the third feed chamber. Here, it is ensured that the air in the low heat and high heat operation is introduced through the outer nozzle. The low heat combustion gases are introduced in a low heat operation by abutting central nozzles and thereby contribute to efficient mixing between the combustion gases and the air as a provider of oxygen for combustion.

Similarly, in high heat operation, air is introduced through the outer nozzle and the O ₂ depleted gas system is introduced through the central nozzle so that the gases can be premixed with each other. The high heat combustion gas system is introduced through the inner nozzle. Again, efficient mixing of the combustion gases with oxygen carriers for combustion containing air and O ₂ depleted gas is possible here.

Further, a control unit is provided that is designed to introduce air into the first feed chamber during low heat operation, introduce low heat combustion gases into the second feed chamber, and block supply to the third feed chamber. The control unit is additionally designed such that in high heat operation, air is introduced into the first feed chamber, O ₂ spent gas is introduced into the second feed chamber, and high hot combustion gases are introduced into the third feed chamber. Via such a control unit, it is ensured that in addition to the low heat combustion gases, the O ₂ depleted gas is not erroneously introduced into the second feed chamber during low heat operation. This can cause uncontrolled combustion characteristics in the combustion chamber.

The ratio of the cross-sectional area of the first nozzle to the second nozzle and the third nozzle is preferably in the range of 4.4 to 5.0:5.9 to 6.3:1, especially 4.7:6.2:1. The cross-sectional ratio can also be designed to deviate from the gas used, depending on the lambda value used, the low heat and high heat combustion gases, the corresponding stoichiometric air demand of the gas, and/or the operating or blowing pressure. Via this configuration of the cross-sectional area, it essentially determines the possible flow of the respective gas, ensuring that sufficient hot gas is produced in the case of the multi-gas burner thus formed in the two modes of operation. In particular, the design of the second nozzle is significant for this purpose, since it is used for two different gases, on the one hand low heat combustion gases, and in another operating state O ₂ depleted gas.

If a plurality of burner lances are provided, and the first nozzle of each burner lance is in fluid communication with the first feed chamber, each second nozzle is in fluid communication with the second feed chamber, and each third nozzle is in fluid communication to the third feed The chamber is advantageous. In the smallest case, a burner gun forms a complete multi-gas burner. The desired burner output is achieved by selecting the number of burner lances. The individual burner lances are normalized to an output so that, in the case of amplification of the burner, there is no need to scale up. In this regard, reference to "numbering-up", that is, modified criteria regarding geometry, fluid characteristics, etc., does not have to be considered in each burner configuration. By using multiple burner lances in a multi-gas burner, it is possible overall to achieve a higher output of the multi-gas burner. In addition, by using a burner spray gun, better adjustment characteristics can be achieved. Since this basic reason is the "mutual support" of the burner gun bundle, that is, the output can be adjusted downward, and a large number of burner guns repeatedly act as "ignition sources" so that individual flames do not extinguish. Thus, even in the case of low hot gases, a ratio of 1:15 is also possible, although the preload associated with the components of the combustion is in the low pressure range.

Since only three feed chambers are provided, the structure of the multi-gas burner is simplified as a whole.

The invention further relates to a processing apparatus having a multi-gas burner according to the invention and a grinding apparatus for solid fuel, such as a coal grinding apparatus. In particular, it may be a roll mill in which a coal grinding apparatus is provided as a member for use as a source of O ₂ depleted gas. The O ₂ depleted gas can be a recycled process gas from a grinding process, in particular a grinding/drying process. Of course, such a configuration can also be used for any other thermal process, that is, using a plurality of gases (low O ₂ content in the process gas) and using it as a recycle gas (high adjustment ratio), and the like.

With the control unit which can be designed as a control and regulation unit, the flow rates of different gases, high-heat combustion gases, low-heat combustion gases, air and O ₂ spent gases can be set accordingly depending on the mode of operation. The control or regulation takes place in such a way that in the high-heat operation, the required heating value is achieved with a flame temperature below 1300 ° C and a maximum oxygen content below 10% of the heat treatment gas in detail. Similarly, by means of the control and regulating unit, the flow in the low-heat operation can be controlled in such a way that a sufficient heating value is reached without reaching an excessively high flame temperature. When a low hot gas is used, a low calorific value requires a low combustion temperature so that no significant O ₂ problem occurs in the process gas herein. In detail, the corresponding characteristics can be solved by setting the amount of gas used and the ratio of gas to each other.

Figure 1 shows a simplified structure of a multi-gas burner 1 according to the invention. The multi-gas burner 1 shown here has two burner lances 10, each designed as a three-lance burner or a three-nozzle lance, and having a first nozzle 11, a second nozzle 12 and a third nozzle 13. The burner lances 10 terminate in the combustion chamber 3, respectively.

The multi-gas burner 1 according to the invention additionally has a first feed chamber 21, a second feed chamber 22 and a third feed chamber 23. The nozzles 11, 12, 13 of the burner lance 10 are formed from three conduits that are oriented coaxially relative to one another. The first nozzle 11 terminates in the first feed chamber 21. The second nozzle 12 terminates in the second feed chamber 22 and the third nozzle 13 terminates in the third feed chamber 23. The nozzles 11, 12, 13 or the end ducts can here be fixed to the inner walls of the respective feed chambers 21, 22, 23 by flange-like connections, respectively. Further, the initial burner 17 is disposed in the center of the multi-gas burner 1 and is used to start the multi-gas burner 1.

Further, a feed 31 is provided for the first feed chamber 21, a feed 32 is used for the second feed chamber 22, and a feed 33 is used for the third feed chamber 23. Additionally, an additional fourth feed 34 is also provided that terminates in the second feed chamber 22. The feeds 31, 32, 33, 34 have valves that are controllable via the control unit 36.

Feed 31 is connected to a source of air. Here it is about ordinary ambient air. Feed line 32 is connected to a source of low heat combustion gases. This can for example be a blast furnace gas. Such low-heat combustion gases also become lean. Feed line 33 is connected to a source of high heat combustion gases, which may also be described as rich. Feed line 34 is in turn connected to the source of O ₂ depleted gas. This may have an O ₂ content of less than 10% in detail.

In the case of low heat operation, the control unit 36 controls the valves of the feedstocks 31, 32, 33 and 34 in such a manner that air flows into the first feed chamber 21 through the feed line 31, and the low heat combustion gas flows into the second through the feed 32. In the feed chamber 22. The other two feed lines 33 and 34 are here closed. The ratio of the air flowing into the combustion chamber 3 through the nozzle 11 to the low hot gas flowing into the combustion chamber 3 through the nozzle 12 is adjusted so that the lambda value is in the range of 1.1.

For high heat operation, control unit 36 opens the valves of feed lines 31, 33 and 34. Here, the air flows into the feed chamber 21, the O ₂ depleted gas flows into the feed chamber 22, and the high hot gas flows into the feed chamber 23. By means of the nozzles 11, 12, 13, these gases can flow into the combustion chamber 3 and react with each other therein.

The control unit 36 here controls the flow rate of the air, the O ₂ depleted gas and the high heat combustion gas in such a manner that the λ value is set in the region of 1.6, so that about 30% of the oxygen carrier for combustion is O ₂ depleted gas. . Located at the end of the burner lance 11 on the combustion chamber side, a vortex build can be placed in the region of the respective end of the nozzle to effectively mix the effluent gases with each other.

Alternatively, for the feed 34, other specific examples are also possible, wherein the chamber 22 can be provided with both low heat combustion gases and O ₂ spent gases. For example, it is contemplated that a low hot gas can be introduced through the feed 32, as well as an O ₂ depleted gas. This can be facilitated by the respective feeder and three-way valve. In this case, the feeder 34 is negligible.

2 shows a process diagram of a coal grinding apparatus having a hot gas generator using a multi-gas burner 10 in accordance with the present invention.

The central component of the processing apparatus described herein is on the one hand a grinding classifier combination 52, which may for example be an upright roller mill with recirculating air operation, in particular LOESCHE rolls Grinder. On the other hand, the hot gas generator 51 is provided to have the multi-gas burner 10 according to the present invention. The hot gas generator 51 is used to produce a heat treatment gas or to heat it separately, so that the process gas is used in the grinding process of the classifier combination 52 to dry the material to be ground except for the grinding process. The bottom is raw coal. For this purpose, a hot gas feed 54 is disposed between the hot gas generator 51 and the abrasive classifier combination 52.

Herein, the coal grinding apparatus is only considered to be an embodiment acting on the processing apparatus in which the hot gas generator 51 is used. Instead of the abrasive classifier combination 52, other components may be provided in which the heat treatment gas produced is used.

The raw coal to be ground is fed into the grinding classifier assembly 52 through the coal bunker 61. In the abrasive classifier combination 52, the raw coal is ground into dust and dried by means of hot gases flowing through the feed 54 into the abrasive classifier assembly 52, dewatered by means of an air stream and transported in the direction of the filter 62.

In the filter 62, the generated carbon dust is separated and fed to the dust chamber 63. The carbon dust can then be removed from the dust chamber 63 and fed for its use, such as for a PCI process. The purified process gas from the dust is simultaneously cooled and fed again to the hot gas generator 51 via the process gas recirculation member 56. It is heated herein by combustion energy and fed back to the abrasive classifier assembly 52 by the hot gas feed 54.

The multi-gas burner 10 of the hot gas generator 51 has four different feeds. The feed 71 is used for feeding of a low-heat combustion gas such as a blast furnace gas, the feed 72 is for feeding of air, the feed 73 is for feeding of a high-heat combustion gas such as coke gas, and the feed 74 is for feeding the gas Start burner. Natural gas can be used in embodiments for this purpose.

According to the method of the present invention, when the multi-gas burner is ignited with a high-heat gas, a recycle gas branching member 57 is additionally provided in the process gas recycle 56 in order to also be able to mix the O ₂ depleted gas with the air. This branching element 57 terminates in a recycle gas feed 76 that terminates in the feed line of the low hot combustion gases.

Depending on the mode of operation of the multi-gas burner 10 of the selected hot gas generator 1, it is possible to feed the low-heat combustion gas through the feed 71 or a recycle gas such as O ₂ depleted gas recovered from the recycle process gas. . This recycle process gas is also referred to as recycle gas.

With the method according to the invention and the multi-gas burner according to the invention, it is therefore possible to use low-heat combustion gases and also high-heat combustion gases while complying with the environmental and safety regulations for the production of heat-treating gases.

1‧‧‧Multi-gas burner

3‧‧‧ combustion chamber

10‧‧‧ burner spray gun

11‧‧‧First nozzle

12‧‧‧second nozzle

13‧‧‧ third nozzle

21‧‧‧First feeding room

22‧‧‧Second feed chamber

23‧‧‧ Third Feeding Room

31‧‧‧ feeder

32‧‧‧ feeder

33‧‧‧ feeder

34‧‧‧ feeder

36‧‧‧Control unit

Claims (15)

A method of operating a multi-gas burner (1) with low-heat and high-heat combustion gases, wherein the multi-gas burner (1) has at least one burner lance (10) having first (11), second (12) And a third nozzle (13), a first feed chamber (21), a second feed chamber (22) and a third feed chamber (23), each of the feed chambers being in fluid communication with the respective nozzles (11, 12) And 13), and the combustion chamber (3), the at least one burner lance (10) is extended therein, characterized in that in the high heat operation, air passes through the first nozzle (11), and at the same time O _{2 is} depleted The gas system is fed into the combustion chamber (3) through the second nozzle (13) through the second nozzle (12) and the high-heat combustion gas system, and the gases are reacted in the combustion chamber (3), in detail burning The air and the O ₂ depleted gas are used as an oxygen carrier for combustion. The method of claim 1, characterized in that in the low-heat operation, the operating air as the oxygen carrier for combustion is fed into the combustion chamber (3) through the first nozzle (11) while being low-heating The combustion gas system is fed into the combustion chamber (3) through the second nozzle (12), and the gases react in the combustion chamber (3), in particular combustion. The method of claim 1 or 2, wherein the outer nozzle is selected as the first nozzle (11), the central nozzle is selected as the second nozzle (12), and the inner nozzle is selected as the third nozzle (13). The method of any one of claims 1 to 3, characterized in that the multi-gas burner (1) is operated with a low heat operation with a lambda value ranging from about 1.05 to about 1.2. . The method of any one of claims 1 to 4, characterized in that the multi-gas burner (1) is operated in a high heat operation with a lambda value of from about 1.4 to about 2.0, wherein 15% to 30% of the oxygen supplier is from the O ₂ depleted gas. The method of any one of claims 1 to 5, characterized in that the lambda value in the low heat operation and the lambda value in the high heat operation and the mixing of the O ₂ spent gas are set such that the The hot gas has an O ₂ content of less than 10%. The method of any one of claims 1 to 6, characterized in that the amount of the combustion gas, the lambda value, and the composition of the oxygen carrier for combustion from air and O ₂ depleted gas Set so that the flame temperature does not exceed 1300 °C. The method of any one of claims 1 to 7, characterized in that the recycle process gas system from the grinding operation, in detail the grinding apparatus for solid fuel, is used as the O ₂ depleted gas. The method of any one of claims 1 to 8, characterized in that the coke boiler gas system is used as a high heat gas and the blast furnace gas system is used as a low heat gas. A multi-gas burner (1) operated with low-heat and high-heat combustion gases, having a combustion chamber (3), at least one burner spray gun (10) having a first nozzle (11), a second nozzle (12), and a third nozzle (13), a first feed chamber (21), a second feed chamber (22) and a third feed chamber (23) each in fluid communication to a corresponding one for feeding gas to the combustion chamber Nozzles (11, 12, 13), wherein the nozzles (11, 12, 13) terminate at the combustion chamber (3) at one end and terminate at respective feed chambers (21, 22, 23) at the other end, wherein The combustion chamber (3) has a burner muffle in the end region of the nozzles (11, 12, 13), characterized in that the first feed chamber (21) is designed to feed an oxygen carrier for combustion The second feed chamber (22) is designed to feed the low-heat combustion gas and the O ₂ depleted gas, the third feed chamber (23) is designed to feed the high-heat combustion gas, and the feed unit is used for Feeding the low-heat combustion gas and the O ₂ depleted gas into the second feed chamber (22), depending on the mode of operation of the multi-gas burner (1), which is designed to treat the low-heat combustion gas or O ₂ spent gas is introduced into the second feed chamber (22). A gas burner (1) according to claim 10, characterized in that the first nozzle (11) is a nozzle outside the burner lance (10), and the second nozzle (12) is a burner lance (10) a central nozzle, and the third nozzle (13) is an inner nozzle of the burner spray gun (10), the first nozzle (11) is in fluid communication with the first feed chamber (21), the second The nozzle (12) is in fluid communication with the second feed chamber (22), the third nozzle (13) being in fluid communication with the third feed chamber (23). A gas burner (1) according to claim 10 or 11, wherein the control unit is arranged to introduce air into the first feed chamber (21) during low heat operation, introducing The low-heat combustion gas into the second feed chamber (22) and blocking the feed into the third feed chamber (23), and the control unit is designed to introduce air to the first during high heat operation In the feed chamber (21), O ₂ depleted gas is introduced into the second feed chamber (22), and the high heat combustion gas is introduced into the third feed chamber (23). The multi-gas burner (1) according to any one of claims 10 to 12, characterized in that the first nozzle (11) and the second nozzle (12) and the third nozzle (13) The ratio of the cross-sectional area depends on the lambda value used, the low heat and the high hot combustion gas and/or the corresponding stoichiometric air requirement, and in particular about 4.5 to 4.9: 6.0 to 6.4:1. In the area. A multi-gas burner (1) according to any one of claims 1 to 13, characterized in that a plurality of burner lances (10) are provided, and each first nozzle (11) is in fluid communication with the first A feed chamber (21), each second nozzle (12) is in fluid communication with the second feed chamber (22), and each third nozzle (13) is in fluid communication with the third feed chamber (23). A processing apparatus having a multi-gas burner (1) according to any one of claims 10 to 14 and a thermal process, wherein the recirculating process gas from the hot process is used as an O ₂ depleted gas .