CN215864704U - System for realizing low nitrogen oxide emission in regenerative combustion of glass kiln - Google Patents

System for realizing low nitrogen oxide emission in regenerative combustion of glass kiln Download PDF

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CN215864704U
CN215864704U CN202121823823.6U CN202121823823U CN215864704U CN 215864704 U CN215864704 U CN 215864704U CN 202121823823 U CN202121823823 U CN 202121823823U CN 215864704 U CN215864704 U CN 215864704U
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temperature
heat accumulator
combustion
glass
heat storage
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曾小军
汪小憨
杨卫斌
杨浩林
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Guangzhou Institute of Energy Conversion of CAS
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Guangzhou Institute of Energy Conversion of CAS
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/14—Thermal energy storage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping

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Abstract

The utility model discloses a system for realizing low nitrogen oxide emission in regenerative combustion of a glass kiln, and relates to a treatment device for reducing NOx emission in regenerative combustion of the glass kiln, which comprises a glass melting bath, high-temperature regenerative chambers and a four-way reversing valve, wherein the two high-temperature regenerative chambers are symmetrically arranged on two sides of the glass melting bath, a first heat accumulator and a second heat accumulator are arranged in the high-temperature regenerative chambers from top to bottom, a second heat accumulation cavity is formed in the lower space of the second heat accumulator, the second heat accumulation cavities of the two high-temperature regenerative chambers are connected with the four-way reversing valve through a second channel, and the four-way reversing valve is simultaneously connected with a combustion-supporting fan and a chimney. The utility model solves the problems of high investment, large equipment occupation area, high operating cost and labor cost and the like of the existing glass kiln nitrogen reduction system, and simultaneously realizes lower NOx emission concentration.

Description

System for realizing low nitrogen oxide emission in regenerative combustion of glass kiln
Technical Field
The utility model relates to a treatment device for reducing NOx emission in regenerative combustion of a glass kiln, in particular to a system for realizing low nitrogen oxide emission in regenerative combustion of the glass kiln.
Background
The glass industry plays an important role in building material production in China and is also one of key industries for industrial pollution control. In the glass production process, as the melting temperature of raw materials is about 1500 ℃, a high-temperature area generated by fuel combustion is concentrated, so that a large amount of thermal nitrogen oxides are generated in a glass melting furnace; meanwhile, the temperature of the flue gas at the outlet of the glass melting furnace is kept at about 1000 ℃, and the glass enterprises widely adopt a high-temperature heat storage combustion technology to fully recover the waste heat of the flue gas at present. The high-temperature heat accumulation combustion is based on the heat accumulator, the high-temperature flue gas and the combustion-supporting air alternately flow through the heat accumulator, the physical sensible heat of the high-temperature flue gas is transmitted to the combustion-supporting air through reciprocating circulation, the combustion-supporting air is heated to about 800-1000 ℃ and enters the kiln, the utilization rate of the waste heat of the flue gas can be effectively improved, and the heat efficiency of the kiln can be improved.
The NOx generated in glass production is not well controlled at present, for example, a flat glass production process is taken as an example, the emission level of nitrogen oxides in a domestic large glass kiln which is not treated at present is 1200-3000 mg/Nm3, which is far higher than that of other industries, and a large amount of nitrogen oxides are emitted every year, so that serious environmental pollution such as acid rain, photochemical smog, ozone layer damage, haze and the like is caused; the latest emission standard of nitrogen oxides in the emission standard of atmospheric pollutants in the plate glass industry is 700mg/Nm3, in order to meet the emission standard, most enterprises adopt the current mature selective catalytic denitration (SCR) technology to reduce the concentration of NOx in flue gas, the effective reaction temperature range of the SCR technology is between 320 and 450 ℃, the most commonly used reducing agent is ammonia, usually ammonia water or liquid ammonia is used as a source, and a corresponding ammonia injection system and equipment are required to be configured; meanwhile, the SCR technology has the problems of catalyst poisoning, low-temperature adhesion of alkaline dust in flue gas and channel blockage to reduce the catalytic efficiency in the operation process, and enterprises need to be equipped with large-scale high-temperature dust removal equipment to relieve the problems. Besides higher catalyst cost, the SCR technical system occupies large area of equipment, has high auxiliary equipment investment, needs to continuously purchase reducing agents in normal operation, and increases related equipment maintenance cost and additional human resource cost, and the cost brings huge economic burden to glass production enterprises and seriously influences the market competitiveness and viability of the enterprises.
Utility model people applied for the utility model patent of a technology and system of direct degradation NOx in industrial furnace burning in earlier stage, had the initial stage and invested in less, maintain convenient, do not increase the advantage of human cost, nevertheless did not propose specific solution to the technological structure of glass kiln specially.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model provides a system for realizing low nitrogen oxide emission in regenerative combustion of a glass kiln, which solves the problems of high investment, large equipment occupation area, high running cost and labor cost and the like of the existing nitrogen reduction system of the glass kiln, and simultaneously realizes lower NOx emission concentration.
In order to achieve the purpose, the technical scheme of the utility model is as follows:
a system for realizing low nitrogen oxide emission in regenerative combustion of a glass kiln comprises:
the side wall of the glass melting bath is symmetrically provided with a first fuel spray gun and a second fuel spray gun;
the high-temperature regenerators are symmetrically arranged on two sides of the glass melting bath and are provided with a first regenerator and a second regenerator from top to bottom, wherein the heat storage temperature of the first regenerator is higher than that of the second regenerator; a first heat storage cavity is formed in the space above the first heat accumulator, and the first heat storage cavities of the two high-temperature heat storage chambers are communicated with the glass melting bath through a first channel;
the four-way reversing valve is characterized in that a second heat storage cavity is formed in the space below the second heat storage body, the second heat storage cavities of the two high-temperature heat storage chambers are connected with the four-way reversing valve through a second channel, and the four-way reversing valve is simultaneously connected with a combustion fan and a chimney.
The system for realizing low nitrogen oxide emission in the regenerative combustion of the glass kiln further comprises a first heat accumulator and a second heat accumulator, wherein the first heat accumulator is formed by mixing one or more of cerium oxide, yttrium oxide, dysprosium oxide, samarium oxide, barium oxide, copper oxide, magnesium oxide, aluminum oxide and the like with zirconium oxide as a base heat storage material and sintering a formed structural member, coating the surface of the formed structural member and the like.
The system for realizing low nitrogen oxide emission in regenerative combustion of the glass kiln is characterized in that the first heat accumulator is a spherical, honeycomb, sheet, tubular or square structure with holes, and the like, and is stacked to form a main body structure of the heat accumulator, and regular or irregular flue gas channels are formed in the main body of the heat accumulator.
The system for realizing low nitrogen oxide emission in the regenerative combustion of the glass kiln is characterized in that the second heat accumulator is built by adopting common alumina material checker bricks.
A method for achieving low nitrogen oxide emission in regenerative combustion, which is used for the regenerative combustion system of the glass kiln, comprises the following steps:
the fuel sprayed by the second fuel spray gun is mixed and combusted with high-temperature air entering the glass melting pool from the high-temperature regenerator at the right side, and the glass raw material in the glass melting pool is melted into molten glass by the heat generated by combustion;
along with the combustion, the flue gas carrying the nitrogen oxides enters the left high-temperature regenerator;
the flue gas with the temperature exceeding a certain first set temperature firstly enters a flue gas channel of the left first heat accumulator to heat the left first heat accumulator, and the temperature of the left first heat accumulator rapidly rises to be higher than a second set temperature;
in a high-temperature low-oxygen environment, oxygen vacancies formed on the surface of the oxide material of the heat accumulator adsorb a large amount of NO in the flue gas, the adsorbed oxygen vacancies cause the N-O bond to be rapidly broken through electron contention, and the NO is directly decomposed into N2And O2Releasing nitrogen oxides in the flue gas, and reducing the temperature of the flue gas to be below a third set temperature;
the flue gas after the nitrogen reduction treatment enters the second heat accumulator on the left side to continuously release heat, and the flue gas after the nitrogen reduction treatment enters a second channel communicated with a chimney through a four-way reversing valve and is discharged after the heat is transferred to the second heat accumulator on the left side.
In the method for realizing low nitrogen oxide emission in regenerative combustion, combustion air fed by a combustion fan enters a first channel through which the four-way reversing valves are communicated with the right high-temperature regenerator, and is fed into the glass melt 4 to be mixed with fuel for combustion after being continuously heated by the right second regenerator and the right first regenerator.
The method for realizing low nitrogen oxide emission in regenerative combustion further comprises the steps of closing the second fuel spray gun after the temperature of the first heat accumulator and the second heat accumulator running to the right decreases, and then switching the four-way reversing valve to communicate the combustion-supporting fan with the left high-temperature regenerative chamber and communicate the right high-temperature regenerative chamber with the chimney;
and after the combustion-supporting air sent by the combustion-supporting fan enters the glass melting tank through the continuous heating of the left second heat accumulator and the left first heat accumulator, the first fuel spray gun is started, the sprayed fuel is combusted in high-temperature air to supply heat, and the combusted high-temperature flue gas enters the right high-temperature heat accumulator and is repeatedly and circularly switched.
Compared with the prior art, the utility model has the beneficial effects that: the utility model has the characteristics of one-time investment, convenient installation and maintenance, no additional equipment or newly added field, does not change the existing structure and process flow of the glass kiln, greatly reduces the high investment and operation and maintenance cost for reducing the emission of the nitrogen oxides of the glass enterprises, can also realize the lower NOx emission requirement, can be well matched and applied to occasions such as glass melting furnaces, nonferrous metallurgy melting furnaces, regenerative furnaces in the steel industry and the like which adopt the high-temperature heat storage combustion technology, reduces the NOx emission concentration in high-temperature production, and makes contribution to the emission reduction of pollutants of the enterprises.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a technical schematic diagram of a high-temperature heat accumulator for realizing low NOx emission in regenerative combustion of a glass kiln.
List of reference numerals:
1 high-temperature regenerator one; 2, a high-temperature heat accumulator I; 3 fuel spray gun one; 4, glass melting pool; 5, a fuel spray gun II; 6 high-temperature heat accumulator (II); 7, a second high-temperature regenerator; 8 middle and low temperature heat accumulator; 9, a combustion-supporting fan; 10, a chimney; 11 a four-way reversing valve; 12 low-temperature heat accumulator (I).
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Example (b):
it should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the utility model described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It will be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in an orientation or positional relationship indicated in the drawings for convenience and simplicity of description only and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the utility model.
In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. Furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The utility model provides a system for realizing low nitrogen oxide emission in regenerative combustion of a glass kiln, which solves the problems of high investment, large equipment occupation area, high operation cost, high labor cost and the like of the existing nitrogen reduction system of the glass kiln, and simultaneously realizes lower NOx emission concentration.
In the regenerative combustion system of the glass kiln shown in fig. 1, a fuel spray gun (first) 3 and a fuel spray gun (second) 5 are arranged on the side wall of a glass melting pool 4, the spray guns 3 and the spray guns 5 are arranged in opposite directions and alternately run at intervals; the high-temperature regenerator (I) 1 and the high-temperature regenerator (II) 7 are communicated with the glass melting bath 4 through a flue gas channel above the fuel spray gun; high-temperature regenerators 2 and 6 are arranged at one ends of the high-temperature regenerators 1 and 7 close to the flue gas outlet of the molten pool; common medium and low temperature heat accumulators 8 and 12 are arranged below the high temperature heat accumulator; the bottom channels of the regenerators are connected with a four-way reversing valve 11 through pipelines, the four-way reversing valve is simultaneously connected with a combustion fan 9 and a chimney 10, and the combustion fan 9 and the chimney 10 are respectively alternated with the two high-temperature regenerators to establish airflow channels through the timing reversing of the four-way reversing valve. The high-temperature heat accumulator adopts zirconium oxide as a base heat accumulation material, one or more of cerium oxide, yttrium oxide, dysprosium oxide, samarium oxide, barium oxide, copper oxide, magnesium oxide, aluminum oxide and the like are mixed, and the heat accumulator is formed by sintering a molded structural member, surface coating and other processes; in a high-temperature low-oxygen environment, the oxygen vacancy formed on the surface of the oxide material of the heat accumulator is utilized to adsorb NO in the flue gas, the N-O bond is rapidly broken under the action of the oxygen vacancy, and the NO in the flue gas is directly decomposed into N2 and O2 and released, so that the direct degradation of nitrogen oxide in a high-temperature area is realized, and the aim of reducing the concentration of NOx in the flue gas is fulfilled. The heat storage material is in a spherical, honeycomb, sheet, tubular or square structure with holes, and the like, and is stacked and installed to form a main body structure of the heat storage body, and a regular or irregular flue gas channel is formed in the main body of the heat storage body. The medium-low temperature heat accumulator is built by common alumina material checker bricks.
The specific working process of this embodiment is as follows: the fuel sprayed by the fuel spray gun 5 is mixed with high-temperature air entering the glass kiln from the high-temperature regenerator 7The glass raw materials in the molten pool are melted into molten glass by the heat generated by combustion, and because the temperature in the glass molten pool exceeds 1500 ℃, according to the ZeerDuvich mechanism, the concentration of thermal NOx and the temperature are exponentially increased, and a large amount of nitrogen oxides are generated in the flue gas. Along with the combustion, high-temperature flue gas carrying nitric oxides enters the high-temperature regenerator 1, the flue gas with the temperature of over 1000 ℃ firstly enters a flue gas channel in the high-temperature heat accumulator 2 to heat the high-temperature heat accumulator 2, and the temperature of the high-temperature heat accumulator rapidly rises to over 800 ℃; in a high-temperature low-oxygen environment, oxygen vacancies formed on the surface of the oxide material of the heat accumulator adsorb a large amount of NO in the flue gas, the adsorbed oxygen vacancies cause the N-O bond to be rapidly broken through electron contention, and the NO is directly decomposed into N2And O2The nitrogen oxides in the flue gas are reduced to below 700mg/Nm3, and the temperature of the flue gas is reduced to below 800 ℃; the flue gas after the nitrogen reduction treatment enters the medium-low temperature heat accumulator 12 to continuously release heat, and the heat is transferred to the medium-low temperature heat accumulator and then enters a smoke exhaust channel communicated with the chimney 10 through the four-way reversing valve 11 to be exhausted. At the moment, combustion-supporting air fed by a combustion-supporting fan 9 enters an air channel communicated with a four-way reversing valve 11 and a high-temperature regenerator (II) 7, and is fed into the glass melting tank 4 to be mixed with fuel for combustion after being continuously heated by a low-temperature heat accumulator 8 and a high-temperature heat accumulator 6 in the regenerators.
After the temperature of the high-temperature heat accumulator 6 and the medium-low temperature heat accumulator 8 is reduced, the fuel spray gun 5 is firstly closed, and then the four-way reversing valve 11 is switched to enable the combustion-supporting fan 9 to be communicated with the high-temperature heat accumulator 1, and the high-temperature heat accumulator 7 to be communicated with the chimney 10; after combustion-supporting air fed by a combustion-supporting fan 9 enters a glass melting bath through continuous heating of a medium-low temperature heat accumulator 12 and a high-temperature heat accumulator 2, a fuel spray gun 3 is started, sprayed fuel is combusted in the high-temperature air to supply heat, high-temperature flue gas after combustion enters a high-temperature heat accumulator 7, the same process as that of the flue gas entering the high-temperature heat accumulator 1 is repeated, and the high-temperature heat accumulation and combustion in the glass melting bath are formed through repeated cycle switching, the concentration of nitrogen oxides in the flue gas is reduced, and the emission of the nitrogen oxides in the glass kiln is reduced so that the emission standard of the glass kiln can be met.
The first embodiment is as follows:
the high-temperature heat storage material is prepared by using zirconium oxide as a substrate, cerium oxide, barium oxide and yttrium oxide materials are coated on the surface of the high-temperature heat storage material, the proportion of the zirconium oxide to the barium oxide to the yttrium oxide is 10 percent to 20 percent to 70 percent, the heat storage material is placed in an environment with the temperature of 800-1100 ℃, mixed flue gas of O2 and CO2 containing 1000ppm of NO is introduced, after the material is degraded for a period of time, the concentration of outlet NO is reduced to 88ppm, the NO degradation rate is more than 90 percent, and the high-temperature heat storage material completely meets the current industrial emission standard.
Compared with the prior art, the utility model has the characteristics of one-time investment, convenient installation and maintenance, no additional equipment or newly added fields, does not change the existing structure and process flow of the glass kiln, greatly reduces the high investment and operation and maintenance cost for reducing the emission of nitrogen oxides of glass enterprises, can realize lower NOx emission requirement, can be well matched and applied to occasions such as glass melting furnaces, nonferrous metallurgy melting furnaces, regenerative furnaces in the steel industry and the like which adopt a high-temperature regenerative combustion technology, reduces the NOx emission concentration in high-temperature production, and makes contribution to the emission reduction of pollutants of enterprises.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.

Claims (3)

1. A system for realizing low nitrogen oxide emission in regenerative combustion of a glass kiln is characterized by comprising:
the side wall of the glass melting bath is symmetrically provided with a first fuel spray gun and a second fuel spray gun;
the high-temperature regenerators are symmetrically arranged on two sides of the glass melting bath and are provided with a first regenerator and a second regenerator from top to bottom, wherein the heat storage temperature of the first regenerator is higher than that of the second regenerator; a first heat storage cavity is formed in the space above the first heat accumulator, and the first heat storage cavities of the two high-temperature heat storage chambers are communicated with the glass melting bath through a first channel;
the four-way reversing valve is characterized in that a second heat storage cavity is formed in the space below the second heat storage body, the second heat storage cavities of the two high-temperature heat storage chambers are connected with the four-way reversing valve through a second channel, and the four-way reversing valve is simultaneously connected with a combustion fan and a chimney.
2. The system for realizing low nitrogen oxide emission in regenerative combustion of a glass kiln as claimed in claim 1, wherein the first heat accumulator is in the shape of a spherical, honeycomb, sheet, tubular or square perforated structure, the main structure of the heat accumulator is formed by stacking and installing, and regular or irregular flue gas channels are formed in the main body of the heat accumulator.
3. The system for realizing low nitrogen oxide emission in regenerative combustion of a glass kiln as claimed in claim 1, wherein the second heat accumulator is constructed by using common alumina material checker bricks.
CN202121823823.6U 2021-08-05 2021-08-05 System for realizing low nitrogen oxide emission in regenerative combustion of glass kiln Active CN215864704U (en)

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CN202121823823.6U CN215864704U (en) 2021-08-05 2021-08-05 System for realizing low nitrogen oxide emission in regenerative combustion of glass kiln

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Application Number Priority Date Filing Date Title
CN202121823823.6U CN215864704U (en) 2021-08-05 2021-08-05 System for realizing low nitrogen oxide emission in regenerative combustion of glass kiln

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