CN215103049U - Nitrogen-free gas preparation device - Google Patents
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- CN215103049U CN215103049U CN202022760184.5U CN202022760184U CN215103049U CN 215103049 U CN215103049 U CN 215103049U CN 202022760184 U CN202022760184 U CN 202022760184U CN 215103049 U CN215103049 U CN 215103049U
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Abstract
The utility model relates to a nitrogen-free fuel gas preparing device. Adopts oxygen and CO in the circulating flue gas of the industrial kiln2The nitrogen-free fuel gas is prepared into rich oxygen to be used as a gasification agent for gasification to produce nitrogen-free fuel gas, and the nitrogen-free fuel gas preparation device comprises: an oxygen preparation unit for preparing oxygen as an oxygen source; circulating flue gas CO2A recovery unit for recovering CO in kiln tail gas2As the distribution of oxygen-enriched air; oxygen-enriched mixer, oxygen prepared by oxygen preparation unit and circulating flue gas CO2CO recovered by the recovery unit2Is fed to an oxygen-rich mixer in the required ratio and mixed in the oxygen-rich mixer to form a mixture for non-pureOxygen-enriched gas for oxygen gasification; and the non-pure oxygen gasification device is used for generating partial oxidation-reduction reaction between the oxygen-enriched gas sent from the oxygen-enriched mixer and fossil energy in the non-pure oxygen gasification device to generate fuel gas for generating a heat source in the industrial kiln.
Description
Technical Field
The utility model relates to a nitrogen-free fuel gas preparation device, belonging to the technical field of nitrogen-free fuel gas oxygen-enriched combustion process; the nitrogen-free gas preparation device adopts oxygen and CO in the circulating flue gas of the industrial kiln2The nitrogen-free fuel gas is prepared into rich oxygen to be used as a gasification agent for gasification to produce nitrogen-free fuel gas, and is suitable for nitrogen-free combustion of an industrial kiln.
Background
The glass industry is an energy-consuming household, at present, thousands of glass kilns exist in China, the heat efficiency and the heat energy utilization rate are low, the unit consumption of products is large, the cost is high, the pollution is large, and along with the unbalance of global energy supply and the aggravation of regional crisis, the fuel price continuously rises, and the glass production cost is higher and higher. The types of fuels currently used in industrial kilns in China are as follows: coal-fired furnaces, oil-fired furnaces, natural gas furnaces, all-electric furnaces and the like, wherein coal-fired and coal-fired gas are used as fuel in a proportion of more than 60% of all used energy sources. The fuel cost accounts for about 40% of the glass production cost, and the economic benefit of the industry is seriously influenced. Therefore, the demand of fuel in the glass industry for energy saving technology is very urgent.
Glass melting furnaces have historically used air as the combustion medium. At present, fuel gas produced by adopting an air gasification technology is used in a plurality of industrial kilns in China, the fuel gas has low heat value and poor radiation capability, and the nitrogen in the fuel gas reaches 30-40 percent, so that a large amount of NOx is generated in tail gas of the industrial kilns. The NOx gas is discharged into the atmosphere to easily form acid rain to cause environmental pollution.
According to the characteristics of gas radiation, only three-atom and multi-atom gases have radiation capability, and diatoms almost have no radiation capability; the higher the proportion of nitrogen without radiation capacity is, the smaller the blackness of furnace gas is, and the radiation force of the furnace gas on molten glass is influenced. In addition, only 21% of oxygen in the air participates in combustion supporting, 78% of nitrogen does not participate in combustion, a large amount of nitrogen is heated wastefully and is discharged into the atmosphere at high temperature, and energy is wasted.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems in the prior art, through analysis and research on the existing combustion system, the adoption of air for combustion supporting is considered to be an important factor causing high energy consumption, high pollution and high greenhouse effect. The utility model provides a nitrogen-free gas manufacturing device. The nitrogen-free fuel gas overcomes the technical problems of the prior fuel.
The utility model relates to a nitrogen-free gas preparation device, which adopts oxygen and CO in the circulating flue gas of an industrial kiln2Preparing oxygen-enriched gas for gasification of non-pure oxygen as a gasifying agent to produce fuel gas, wherein the preparation device of the nitrogen-free fuel gas comprises: an oxygen preparation unit for preparing oxygen as an oxygen source; circulating flue gas CO2A recovery unit for recovering CO in kiln tail gas2As the distribution of oxygen-enriched air; oxygen-enriched mixer, oxygen prepared by oxygen preparation unit and circulating flue gas CO2CO recovered by the recovery unit2Is delivered to an oxygen-enriched mixer according to the required proportion and is mixed in the oxygen-enriched mixer to form oxygen-enriched gas for gasification of non-pure oxygen; and the non-pure oxygen gasification device is used for generating partial oxidation-reduction reaction between the oxygen-enriched gas sent from the oxygen-enriched mixer and fossil energy in the non-pure oxygen gasification device to generate fuel gas for generating a heat source in the industrial kiln.
The utility model discloses on the other hand nitrogen-free gas prepare device, also can, the oxygen that oxygen preparation unit prepared is carried rich oxygen blender with 0.05 ~ 0.2 MPa's pressure.
The utility model also can be used as oxygen-enriched distribution CO2After being pressurized to 0.05-0.2 MPa, the mixture is sent to an oxygen-enriched mixer.
The utility model discloses on the other hand nitrogen-free gas prepare device, also can, the oxygen purity that oxygen preparation unit prepared is for being greater than 90 v%.
The utility model also discloses another aspect nitrogen-free gas prepare device, also can, CO2Is the purified industrial kiln circulating flue gas.
The utility model also discloses another aspect nitrogen-free gas prepare device, also can, CO2The flue gas is obtained by recovering waste heat, removing dust and desulfurizing the flue gas of the industrial kiln.
The utility model discloses on the other hand nitrogen-free gas prepare device, also can the oxygen-enriched concentration that the oxygen-enriched blender formed is 21 ~ 70 v%.
The utility model discloses another aspect nitrogen-free gas prepare device, also can, circulation flue gas CO2CO collected by the recovery unit2Before being sent to the oxygen-enriched mixer, the gas is passed through a pressure regulating device so that the gas pressure is suitably transmitted in the device.
[ effects of utility model ]
The utility model has the advantages that:
adopts nitrogen-free oxygen-enriched air as gasifying agent to replace air gasification, namely CO in circulating flue gas2The nitrogen in the air gasification agent is replaced, the generation of industrial furnace fuel type nitrogen oxides can be reduced, the generation of industrial furnace fuel type NOx is reduced, and the environment protection is facilitated.
In addition, CO2The nitrogen in the air gasifying agent is replaced and the nitrogen is used as the gasifying agent to participate in the gasification reaction to generate carbon monoxide, the heat value of the fuel gas is increased, and the reaction equation is as follows: c + CO2→ 2 CO. The carbon monoxide content is increased, thereby increasing the heat value of the fuel gas, improving the energy utilization efficiency and being beneficial to saving energy.
According to the characteristics of gas radiationThe gas with three atoms and multiple atoms has radiation capability, and the diatom has almost no radiation capability; the higher the proportion of nitrogen without radiation capacity is, the lower the blackness of furnace gas is, and the radiation force in the furnace is influenced; by using CO2After the gas replaces nitrogen, the radiation coefficient of the fuel gas is improved, and the blackness of the furnace gas and the radiation strength to the inside of the furnace are improved.
Thus, flue gas CO is recycled by oxygen + recycling2The process technology not only improves the heat value and the radiation coefficient of the fuel gas, but also reduces the generation of fuel type NOx of the industrial kiln, and provides reliable guarantee for increasing the production, saving energy and reducing emission of the industrial kiln.
Drawings
FIG. 1 is a schematic view of a nitrogen-free fuel gas producing apparatus.
Description of reference numerals:
1 oxygen preparation device, 2 circulating flue gas CO2The system comprises a recovery device, a blower 3, an oxygen-enriched mixer 4, an oxygen-enriched conveying pipeline 5, an impure oxygen gasification device 6, an industrial kiln 7, a flue gas purification system 8 and a chimney 9.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the accompanying drawings of the embodiments of the present invention are combined below to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.
With the deepening of the research on the energy-saving and consumption-reducing technology of the glass melting furnace, the research on energy-saving means of the glass melting furnace, such as developing an energy-saving glass formula, optimizing the structure of the glass melting furnace, improving the control technology of the glass melting furnace, strengthening the heat preservation and waste heat utilization of the glass melting furnace, and the like, is quite mature. Under this background, will realize the further energy saving and consumption reduction of melting furnace, the utility model people is constantly keenly studied on the improvement of gas, on the basis of oxygen boosting combustion technology, has improved the gas.
Oxycombustion means that the oxygen concentration in the oxidizer for combustion promotion is higher than the oxygen concentration in air (the limit of which is pure oxygen). The oxygen concentration of the air can be concentrated from 20.9 percent to 26 to 30 percent, and simultaneously the residual nitrogen is gradually replaced by carbon dioxide in the tail gas of the flue gas, and the concentrated oxygen air is very suitable and safe for the combustion supporting of various kilns. The oxygen-enriched combustion technology can increase flame blackness, accelerate combustion speed and increase flame temperature, improves radiation heat transfer and convection heat transfer of flame to batch or molten glass because carbon dioxide replaces nitrogen, has high combustion efficiency, and greatly reduces NOXAnd (4) discharging. Meanwhile, the amount of flue gas can be reduced, so that the heat loss of the flue gas is reduced, and good energy-saving and environment-friendly effects are achieved.
The nitrogen-free fuel gas technology is described below. Referring to fig. 1, a nitrogen-free fuel gas technology will be described. Referring to fig. 1, the oxygen production method of the oxygen production apparatus 1 is mature and commonly used, and the oxygen production method includes a cryogenic method, a pressure swing adsorption method, a membrane separation method, and the like.
1. A deep cooling method: the cryogenic process is also called cryogenic rectification process. The process is that air is compressed and cooled, and the air is liquefied, and the gas and liquid are contacted on the rectifying tower plate by utilizing the difference of the boiling points of oxygen and nitrogen components (the boiling point of oxygen is 90K and the boiling point of nitrogen is 77K under the atmospheric pressure) to carry out mass and heat exchange, the oxygen component with high boiling point is continuously condensed into liquid from steam, the nitrogen component with low boiling point is continuously transferred into steam, so that the nitrogen content in the rising steam is continuously increased, and the oxygen content in the down-flow liquid is increasingly higher, thereby separating oxygen from nitrogen.
2. Pressure swing adsorption: the pressure swing adsorption method is also called molecular sieve air separation method, and the principle is that the molecular sieve selectively adsorbs oxygen and nitrogen components in the air to separate the air to obtain oxygen. When the air is pressurized and passes through the adsorption layer of the molecular sieve adsorption tower, nitrogen molecules are preferentially adsorbed, and oxygen molecules are left in the gas phase to become finished oxygen. When the nitrogen component in the adsorbent is adsorbed to saturation, nitrogen molecules adsorbed on the surface of the adsorbent are desorbed by a decompression or vacuum-pumping method and are sent out of a boundary region, so that the adsorption capacity of the adsorbent is recovered.
3. Membrane separation method: the basic principle of membrane separation is based on the fact that the transfer rates of components in air, pushed by pressure, through membranes are different, and thus gas separation is achieved. The method adopts certain high molecular polymers with selective permeability to the activity of different gases, and uses proper high molecular polymers to prepare hollow fibers, thereby realizing the separation of various gases in the air and obtaining the required gases.
Example 1:
for large-scale gas production, the deep cooling method can be adopted to produce oxygen and CO in the circulating flue gas of the kiln2Used as a gasifying agent for preparing nitrogen-free fuel gas.
When the oxygen preparation device 1 in fig. 1 adopts a cryogenic method to prepare oxygen, the process is as follows: the oxygen preparation device 1 firstly compresses and cools air, liquefies the air, makes the air and the liquid contact on a rectifying tower plate by utilizing the difference of the boiling points of oxygen and nitrogen components, carries out mass and heat exchange, continuously condenses the oxygen component with high boiling point into liquid from steam, continuously transfers the nitrogen component with low boiling point into the steam, continuously improves the nitrogen content in the rising steam, and increasingly increases the oxygen content in the downflow liquid, thereby separating the oxygen and the nitrogen to obtain the oxygen with the purity of more than 99.6 v%.
Circulating flue gas CO in FIG. 12The recovery device 2 recovers the kiln exhaust gas, and the rest is discharged through a chimney 9. The flue gas purification system 8 in fig. 1 includes a waste heat recovery system, a dust removal system, and a desulfurization system. The above-mentioned circulating flue gas CO2Part of the circulating flue gas is led out from the recovery device 2 and enters the variable frequency blower 3. Circulating flue gas CO2The gas collected by the recovery unit 2 is mainly CO2In order to make the gas suitable for conveying in the system, circulating flue gas CO is subjected to frequency conversion by a blower 32The recovery unit 2 collects mainly CO2The pressure of the gas is adjusted.
Circulating flue gas CO2The recovery unit 2 collects mainly CO2The gas is pressure-regulated by a variable frequency blower 3 and then sent to an oxygen-enriched mixer 4 in the figure 1 through a flow indication controller FIC; as shown in fig. 1, the oxygen produced by the cryogenic separation is metered and regulated and then sent to an oxygen-rich mixer 4 through an oxygen pipeline; after the metering adjustment of the circulating flue gas purified by the kiln, the circulating flue gas is boosted by a variable frequency blower and then sent to an oxygen-enriched mixer; oxygen and CO in recycled flue gas2Mixing the mixture in a mixer to form 21-70 v% of oxygen-enriched air, wherein the pressure is 0.05-0.2 MPa, and sending the oxygen-enriched air to an impure oxygen gasification device 6 through an oxygen-enriched conveying pipeline 5.
The oxygen-enriched delivery pipeline 5 is provided with an oxygen-enriched flow measuring instrument, a temperature measuring instrument, a pressure measuring instrument and an oxygen purity detecting instrument so as to display the flow, the temperature, the pressure and the oxygen purity of the oxygen-enriched air entering the non-pure oxygen gasification system.
In the non-pure oxygen gasification device 6, the oxygen-enriched gasification agent sent from the oxygen-enriched mixer and raw material coal (or other raw materials) are subjected to gasification reaction in the gasification device, and the generated raw gas is subjected to dust removal, temperature reduction and desulfurization to prepare qualified nitrogen-free gas which is sent to the industrial kiln.
The method is characterized in that air gasification is adopted at the initial stage of starting the non-pure oxygen gasification device, after industrial kiln smoke is generated, oxygen enrichment prepared by mixing circulating smoke and oxygen is used as a combustion improver to gradually replace air gasification, and nitrogen in fuel gas is gradually gasified by CO through circulation for 5-10 hours2Replacing the nitrogen-free fuel gas by replacement, and gasifying the oxygen-rich fuel gas to enter a normal operation state.
Example 2:
for medium and small scale gas production, pressure swing adsorption method is adopted to produce oxygen and CO in kiln circulating flue gas2Used as a gasifying agent for preparing nitrogen-free fuel gas.
In fig. 1, when the oxygen preparation apparatus 1 is used for preparing oxygen by pressure swing adsorption, the process is as follows: when the air passes through the adsorption layer of the molecular sieve adsorption tower after being pressurized, nitrogen molecules are preferentially adsorbed, and oxygen molecules are left in the gas phase to become finished oxygen. When the nitrogen component in the adsorbent is adsorbed to saturation, nitrogen molecules adsorbed on the surface of the adsorbent are desorbed by a decompression or vacuum-pumping method and are sent out of a boundary region, so that the adsorption capacity of the adsorbent is recovered. Thereby separating oxygen and nitrogen to obtain oxygen with the purity of 90-95 v%.
Circulating flue gas CO in FIG. 12The recovery device 2 recovers the kiln exhaust gas, and the rest is discharged through a chimney 9. The flue gas purification system 8 in the attached figure 1 comprises a waste heat recovery system, a dust removal system and a desulfurization system. The above-mentioned circulating flue gas CO2The recycling device 2 leads out part of the circulating flue gas to enter a variable frequency blower 3. Circulating flue gas CO2The gas collected by the recovery unit 2 is mainly CO2In order to make the gas suitable for conveying in the system, circulating flue gas CO is subjected to frequency conversion by a blower 32The recovery unit 2 collects mainly CO2The pressure of the gas is adjusted.
Circulating flue gas CO2The recovery unit 2 collects mainly CO2The gas is pressure-regulated by a variable frequency blower 3 and then sent to an oxygen-enriched mixer 4 in the figure 1 through a flow indication controller FIC; as shown in fig. 1, the oxygen produced by the cryogenic separation is metered and regulated and then sent to an oxygen-rich mixer 4 through an oxygen pipeline; after the metering adjustment of the circulating flue gas purified by the kiln, the circulating flue gas is boosted by a variable frequency blower and then sent to an oxygen-enriched mixer; oxygen and CO in recycled flue gas2Mixing the mixture in a mixer to form 21-70 v% of oxygen-enriched air, wherein the pressure is 0.05-0.2 MPa, and sending the oxygen-enriched air to an impure oxygen gasification device 6 through an oxygen-enriched conveying pipeline 5.
The oxygen-enriched delivery pipeline 5 is provided with an oxygen-enriched flow measuring instrument, a temperature measuring instrument, a pressure measuring instrument and an oxygen purity detecting instrument so as to display the flow, the temperature, the pressure and the oxygen purity of the oxygen-enriched air entering the non-pure oxygen gasification system.
In the non-pure oxygen gasification device 6, the oxygen-enriched gasification agent sent from the oxygen-enriched mixer and raw material coal (or other raw materials) are subjected to gasification reaction in the gasification device, and the generated raw gas is subjected to dust removal, temperature reduction and desulfurization to prepare qualified nitrogen-free gas which is sent to the industrial kiln.
The method is characterized in that air gasification is adopted at the initial stage of starting the non-pure oxygen gasification device, after industrial kiln smoke is generated, oxygen enrichment prepared by mixing circulating smoke and oxygen is used as a combustion improver to gradually replace air gasification, and nitrogen in fuel gas is gradually gasified by CO through circulation for 5-10 hours2Replacing the nitrogen-free fuel gas by replacement, and gasifying the oxygen-rich fuel gas to enter a normal operation state.
Example 3: for medium and small scale gas production, membrane separation method is adopted to produce oxygen and CO in kiln circulating flue gas2Used as a gasifying agent for preparing nitrogen-free fuel gas.
When the oxygen preparation device 1 in fig. 1 adopts a membrane separation method to prepare oxygen, the process is as follows: after the air is pressurized, the high molecular polymer is synthesized into hollow fiber to separate out oxygen. Thereby obtaining the oxygen with the purity of 93-99.5 v%.
Circulating flue gas CO in FIG. 12The recovery device 2 recovers the kiln exhaust gas, and the rest is discharged through a chimney 9. The flue gas purification system 8 in fig. 1 includes a waste heat recovery system, a dust removal system, and a desulfurization system. The above-mentioned circulating flue gas CO2Part of the circulating flue gas is led out from the recovery device 2 and enters the variable frequency blower 3. Circulating flue gas CO2The gas collected by the recovery unit 2 is mainly CO2In order to make the gas suitable for conveying in the system, circulating flue gas CO is subjected to frequency conversion by a blower 32The recovery unit 2 collects mainly CO2The pressure of the gas is adjusted.
Circulating flue gas CO2The recovery unit 2 collects mainly CO2The gas is pressure-regulated by a variable frequency blower 3 and then sent to an oxygen-enriched mixer 4 in the figure 1 through a flow indication controller FIC; as shown in figure 1, oxygen produced by cryogenic separation is metered and regulated and then sent to an oxygen-rich mixer through an oxygen pipeline; after the metering adjustment of the circulating flue gas purified by the kiln, the circulating flue gas is boosted by a variable frequency blower and then sent to an oxygen-enriched mixer; oxygen and CO in recycled flue gas2Mixing the mixture in a mixer to form 21-70 v% of oxygen-enriched air, wherein the pressure is 0.05-0.2 MPa, and sending the oxygen-enriched air to an impure oxygen gasification device 6 through an oxygen-enriched conveying pipeline 5.
The oxygen-enriched delivery pipeline 5 is provided with an oxygen-enriched flow measuring instrument, a temperature measuring instrument, a pressure measuring instrument and an oxygen purity detecting instrument so as to display the flow, the temperature, the pressure and the oxygen purity of the oxygen-enriched air entering the non-pure oxygen gasification system.
In the non-pure oxygen gasification device 6, the oxygen-enriched gasification agent sent from the oxygen-enriched mixer is subjected to gasification reaction with raw material coal (or other raw materials) in the gasification device, and the generated raw gas is subjected to dust removal, temperature reduction and desulfurization to prepare qualified nitrogen-free gas which is sent to the industrial kiln.
The method is characterized in that air gasification is adopted at the initial stage of starting the non-pure oxygen gasification device, after industrial kiln smoke is generated, oxygen enrichment prepared by mixing circulating smoke and oxygen is used as a combustion improver to gradually replace air gasification, and nitrogen in fuel gas is gradually gasified by CO through circulation for 5-10 hours2Replacing the nitrogen-free fuel gas by replacement, and gasifying the oxygen-rich fuel gas to enter a normal operation state.
The utility model relates to a nitrogen-free gas's device of preparing belongs to nitrogen-free gas oxygen boosting combustion technology technical field. Adopts oxygen and CO in the circulating flue gas of the industrial kiln2Prepare the oxygen boosting as the device of the gasified gasifying agent production nitrogen-free fuel gas, is applicable to the nitrogen-free combustion of the industrial kiln, the utility model comprises oxygen preparation, non-oxygen gasification fuel gas production, circulating flue gas CO2Recovering and mixing with rich oxygen; CO recovered from industrial kiln circulating flue gas2After being boosted by a fan, the oxygen and the oxygen produced by the oxygen preparation device are respectively sent to an oxygen-enriched mixer to be mixed into enriched oxygen, and the enriched oxygen is sent to a non-oxygen gasification furnace as a gasification agent. Because of CO in the oxygen-enriched gasifying agent2The nitrogen in the air gasifying agent is replaced, so that the heat value and the radiation coefficient of fuel gas are improved, and the combustion effect of the industrial kiln fuel and the overall radiation capability of flame are effectively enhanced.
The present invention has been described above with reference to the above embodiments, but the present invention is not limited to the above embodiments, and the present invention is also included in the present invention by appropriately combining or replacing the structures of the embodiments. Further, modifications such as changes in the combination of the embodiments and the order of processing can be appropriately adapted to the embodiments based on knowledge in the art, and modifications to the embodiments such as various design changes can be added to the embodiments, and embodiments to which such modifications are added can be included in the scope of the present invention.
Claims (4)
1. A nitrogen-free fuel gas production apparatus, characterized by comprising:
an oxygen preparation unit for preparing oxygen as an oxygen source;
circulating flue gas CO2The recovery unit is used for recovering part of the circulating flue gas after waste heat recovery, dust removal and desulfurization so as to recover CO in the circulating flue gas of the industrial kiln2As the distribution of oxygen-enriched gas;
blower for circulating flue gas CO2CO recovered by the recovery unit2Adjusting the pressure;
an oxygen-rich mixer for the oxygen prepared by the oxygen preparation unit and the circulating flue gas CO after pressure adjustment2CO recovered by the recovery unit2Mixing to obtain oxygen-enriched gas of the non-pure oxygen gasification device;
the non-pure oxygen gasification device is used for carrying out partial oxidation-reduction reaction on the oxygen-enriched gas sent by the oxygen-enriched mixer and fossil energy and taking the oxygen-enriched gas as fuel gas for generating a heat source in an industrial kiln;
the oxygen-enriched delivery pipeline is used for connecting the oxygen-enriched mixer and the non-pure oxygen gasification device;
an industrial kiln;
the flue gas purification system comprises a waste heat recovery system, a dust removal system and a desulfurization system and is used for carrying out waste heat recovery, dust removal and desulfurization on the circulating flue gas generated by the industrial kiln;
and the chimney is used for emptying the circulating flue gas after partial waste heat recovery, dust removal and desulfurization.
2. The nitrogen-free fuel gas production apparatus according to claim 1, wherein a flow rate indicator controller is further provided between the blower and the oxygen-rich mixer.
3. The apparatus for producing a nitrogen-free fuel gas as set forth in claim 1, wherein a flow rate indicating controller is further provided between the oxygen production unit and the oxygen-rich mixer.
4. The nitrogen-free fuel gas producing apparatus as claimed in claim 1, wherein the oxygen-rich delivery pipe is provided with an oxygen-rich flow meter, a temperature measuring instrument, a pressure measuring instrument and an oxygen purity measuring instrument.
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