CN104524939A - Glass denitrification system based on SNCR technology - Google Patents

Glass denitrification system based on SNCR technology Download PDF

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Publication number
CN104524939A
CN104524939A CN201410757977.8A CN201410757977A CN104524939A CN 104524939 A CN104524939 A CN 104524939A CN 201410757977 A CN201410757977 A CN 201410757977A CN 104524939 A CN104524939 A CN 104524939A
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CN
China
Prior art keywords
ammonia
glass
denitrification
injector
technology
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CN201410757977.8A
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Chinese (zh)
Inventor
马婧
苏宁
凌绍华
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秦皇岛杰伯特环境科技有限公司
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Priority to CN201410757977.8A priority Critical patent/CN104524939A/en
Publication of CN104524939A publication Critical patent/CN104524939A/en

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Abstract

The invention discloses a glass denitrification system based on SNCR technology. The glass denitrification system is composed of a glass melting furnace, and a liquid ammonia storage tank, a liquid ammonia evaporator, an ammonia gas buffering tank, an ammonia/air mixer, an ammonia gas distribution and regulation system and an ammonia ejection system, which are connected in sequence, wherein the core component of the ammonia ejection system is an ammonia gas ejector, the temperature at the middle upper part of a heat storage chamber of the glass melting furnace is 850-1050 DEG C, a plurality of ammonia gas ejectors are arranged in a high temperature area without flame, the plurality of ammonia gas ejectors are arranged on multiple layers, and each ammonia gas ejector forms multipoint planar radiation to enable the ammonia gas to retain in a reflection area for at least 0.5 seconds. According to the invention, the heat storage chamber of the glass melting furnace is used as a reactor, thus no additional reactor needs to be arranged; the SNCR technology is used for performing glass denitrification, and no catalyst is used in the denitrification process, thus such defects caused by other flue gas denitrification technology as air pre-heater blockage, pressure loss and the like are generated; the denitrification efficiency can be higher than 90% and can be comparable with that of the SCR technology.

Description

Based on the glass denitrating system of SNCR technology
Technical field
The invention belongs to glass denitration field, specifically a kind of glass denitrating system based on SNCR technology.
Background technology
At present, the denitration of glass industry always be SCR(selective catalytic reduction) technology.SCR technology is in the presence of a solid catalyst, in the flue gas of temperature 280-420 DEG C, spray into reducing agent urea or ammoniacal liquor, by NO xbe reduced to harmless N 2and H 2o.The method, can obtain higher removal efficiency at a lower temperature, denitration efficiency is up to more than 90%.
Ammine selectivity catalytic reduction method (SCR) be recognized in the worldly to apply at most in process glass industry, the most ripe, the most fruitful a kind of gas denitrifying technology; But the shortcoming of SCR technology is: equipment investment is high, key technology difficulty is large; Need to consume NH in a large number 3and catalyst, and the catalyst used at present still relies on external product mostly, therefore about catalyst costs accounts for the half of SCR system initial outlay usually, its operating cost affects (catalyst is easily aging) by catalyst life to a great extent, therefore has that operating cost is high, a large and shortcoming that catalyst reaction is easily poisoning of equipment investment.
At present, the denitration of glass industry does not also use SNCR(selective catalytic reduction) technology.SNCR technology is by NH 3, the reducing agent such as urea sprays in Boiler Furnace and carries out selective reaction, without catalyst with NOx; Therefore reducing agent must be added in high-temperature region; Reducing agent sprays into the region that fire box temperature is 850 ~ 1100 DEG C, can become NH by rapid thermal decomposition 3, then react with the NOx in flue gas and generate N2 and water.And SNCR technology in the main cause of the application of glass industry is not: what temperature window reducing agent is injected in, and the NO in the reducing agent sprayed into and flue gas xfully can mix, be not only key problem in technology, or technological difficulties, existing method cannot realize higher denitration efficiency, and reducing agent utilization rate is low; Therefore, directly existing SNCR technology cannot be applied to the denitration of glass industry.And if this technical problem can be solved, greatly will save cost, and improve denitration efficiency.
Summary of the invention
The object of the present invention is to provide the glass denitrating system based on SNCR technology that a kind of cost is low, denitration efficiency is high, to solve the problem proposed in above-mentioned background technology.
For achieving the above object, the invention provides following technical scheme:
Based on a glass denitrating system for SNCR technology, by glass melter, and the liquid ammonia storage tank connected successively, liquid ammonia evaporator, ammonia surge tank, ammonia/air mixer, ammonia distribution regulating system and spray ammonia system composition; Its technological process is: first utilize the discharging compressor of liquefied ammonia tank car to be input in liquid ammonia storage tank by liquefied ammonia by liquefied ammonia tank car, then with ammonia pump the liquefied ammonia in liquid ammonia storage tank is transported in liquid ammonia evaporator and is evaporated to ammonia, deliver to ammonia/air mixer through ammonia surge tank again, be mixed into the ammonia/empty gaseous mixture of desired concn with air; Ammonia/empty gaseous mixture distributes regulating system through ammonia and spray ammonia system is ejected in glass melter; The core component of described spray ammonia system is ammonia injector, be 850 ~ 1050 DEG C and fireless high-temperature area layout multiple stage ammonia injector in the middle and upper part temperature of the regenerator of glass furnace, and multiple stage ammonia injector divides multilayer to arrange, it is planar radiation that each ammonia injector is multiple spot, and ammonia can be stopped at least 0.5 second at reflecting regional.
As the further scheme of the present invention: be also provided with flue gas on-line detecting system, and distribute regulating system with ammonia injector and ammonia respectively by flue gas on-line detecting system and interlock; By NOx and NH in flue gas in on-line checkingi glass melter 3discharge value, utilize reponse system automatically to regulate the ammonia emitted dose of ammonia injector; In addition, the assignment of traffic of ammonia is controlled automatically by ammonia distribution regulating system.
As the further scheme of the present invention: also comprise PLC control system.
The present invention for reactor, adopts SNCR technology to carry out glass denitration with the regenerator of glass melter; Compared with prior art, the invention has the beneficial effects as follows:
(1) construction of SNCR denitration system is one-time investment, and operating cost is low;
(2) in denitrification process, do not use catalyst, therefore can not cause the drawback that other gas denitrifying technologies such as air preheater blocking and the pressure loss cause;
(3) occupation area of equipment of native system is little, and denitration technology economy is high;
(4) the whole reduction process of native system is just carried out in glass melter inside, does not need to set up reactor in addition;
(5) denitration efficiency can reach more than 90%, can compare favourably with SCR technology.
Accompanying drawing explanation
Fig. 1 is the process chart of the glass denitrating system based on SNCR technology.
Detailed description of the invention
Be described in more detail below in conjunction with the technical scheme of detailed description of the invention to this patent.
Refer to Fig. 1, a kind of glass denitrating system based on SNCR technology, by glass melter, and the liquid ammonia storage tank connected successively, liquid ammonia evaporator, ammonia surge tank, ammonia/air mixer, ammonia distribution regulating system and spray ammonia system composition; Its technological process is: first utilize the discharging compressor of liquefied ammonia tank car to be input in liquid ammonia storage tank by liquefied ammonia by liquefied ammonia tank car, then with ammonia pump the liquefied ammonia in liquid ammonia storage tank is transported in liquid ammonia evaporator and is evaporated to ammonia, deliver to ammonia/air mixer through ammonia surge tank again, be mixed into the ammonia/empty gaseous mixture of desired concn with air; Ammonia/empty gaseous mixture distributes regulating system through ammonia and spray ammonia system is ejected in glass melter.
In the present invention, the core component of described spray ammonia system is ammonia injector, be 850 ~ 1050 DEG C and fireless high-temperature area layout multiple stage ammonia injector in the middle and upper part temperature of the regenerator of glass furnace, and multiple stage ammonia injector divides multilayer to arrange, it is planar radiation that each ammonia injector is multiple spot, and ammonia can be stopped at least 0.5 second at reflecting regional.Fuel and the rear flue gas produced of combustion air definite value ratio burning arrive the regenerator on opposite by burner hearth; Flue gas and reducing agent ammonia can be the region of 850 ~ 1050 DEG C in temperature, and the NOx rapidly and in flue gas reacts and generates N 2and water; Flue gas after denitration enters branch flue through down going channel again; Be discharged in air through waste gas main chimney flue and chimney again.
Main operational principle of the present invention is: SNCR technology (SNCR), is to add reducing agent ammonia in the suitable temperature region (about 850 ~ 1050 DEG C) of glass melter, is having under part oxygen existent condition, ammonia and NOx(NO, NO 2in mixture) there is SNCR reaction, NOx conversion is become free of contamination N 2.When reaction zone temperature is too low, reaction efficiency can reduce; When reaction zone temperature is too high, ammonia directly can be oxidized to N 2and NO.Key reaction is as follows:
4NO+4NH 3+O 2→4N 2+6H 2O ;
6NO+4NH 3→5N 2+6H 2O;
6NO 2+8NH 3→7N 2+12H 2O;
2NO 2+4NH 3+O 2→ 3N 2+6H 2O。
Therefore, in order to improve de-NO xefficiency and realize NH 3escape minimize, need meet the following conditions: the position sprayed at reducing agent does not have flame; Suitable temperature range (850 ~ 1050 DEG C) is maintained at conversion zone; Enough time of staying (when temperature is 900 DEG C at least 0.5 second) are had at conversion zone.
In the present invention, be also provided with flue gas on-line detecting system, and distribute regulating system with ammonia injector and ammonia respectively by flue gas on-line detecting system and interlock; By NOx and NH in flue gas in on-line checkingi glass melter 3discharge value, utilize reponse system automatically to regulate the ammonia emitted dose of ammonia injector, under guarantee denitration efficiency prerequisite, reduce system operation cost, avoid the secondary pollution that excessive spray ammonia causes simultaneously; In addition, the assignment of traffic of ammonia is controlled automatically by ammonia distribution regulating system.The injection flow of ammonia injector, expulsion pressure will guarantee that ammonia is in this region complete reaction, will ensure the service life not affecting kiln simultaneously.
In the present invention, also comprise PLC control system, engineer or operator station can control total system in control room, by every analysis and the measuring instrument of system configuration, and the operation of automatic follow procedure control appliance; Denitrating system can realize control far away, local operation.
Above the better embodiment of this patent is explained in detail, but this patent is not limited to above-mentioned embodiment, in the ken that one skilled in the relevant art possesses, can also makes a variety of changes under the prerequisite not departing from this patent aim.

Claims (3)

1., based on a glass denitrating system for SNCR technology, it is characterized in that, by glass melter, and the liquid ammonia storage tank connected successively, liquid ammonia evaporator, ammonia surge tank, ammonia/air mixer, ammonia distribution regulating system and spray ammonia system composition; Its technological process is: first utilize the discharging compressor of liquefied ammonia tank car to be input in liquid ammonia storage tank by liquefied ammonia by liquefied ammonia tank car, then with ammonia pump the liquefied ammonia in liquid ammonia storage tank is transported in liquid ammonia evaporator and is evaporated to ammonia, deliver to ammonia/air mixer through ammonia surge tank again, be mixed into the ammonia/empty gaseous mixture of desired concn with air; Ammonia/empty gaseous mixture distributes regulating system through ammonia and spray ammonia system is ejected in glass melter; The core component of described spray ammonia system is ammonia injector, be 850 ~ 1050 DEG C and fireless high-temperature area layout multiple stage ammonia injector in the middle and upper part temperature of the regenerator of glass furnace, and multiple stage ammonia injector divides multilayer to arrange, it is planar radiation that each ammonia injector is multiple spot, and ammonia can be stopped at least 0.5 second at reflecting regional.
2. the glass denitrating system based on SNCR technology according to claim 1, is characterized in that, be also provided with flue gas on-line detecting system, and distributes regulating system with ammonia injector and ammonia respectively by flue gas on-line detecting system and interlock; By NOx and NH in flue gas in on-line checkingi glass melter 3discharge value, utilize reponse system automatically to regulate the ammonia emitted dose of ammonia injector; In addition, the assignment of traffic of ammonia is controlled automatically by ammonia distribution regulating system.
3. the glass denitrating system based on SNCR technology according to claim 1 and 2, is characterized in that, also comprise PLC control system.
CN201410757977.8A 2014-12-12 2014-12-12 Glass denitrification system based on SNCR technology CN104524939A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105169919A (en) * 2015-10-09 2015-12-23 索通发展股份有限公司 Flue gas denitration device for carbon pot calciner and denitration technology of flue gas denitration device
CN108786428A (en) * 2018-06-07 2018-11-13 光大环保技术研究院(南京)有限公司 A kind of SNCR denitration optimal control system and control method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0599547A1 (en) * 1992-11-27 1994-06-01 Pilkington Glass Limited Glass furnaces
CN1203890A (en) * 1997-05-05 1999-01-06 Ppg工业公司 Reduction of Nox emissions in glass melting furnace
CN101439260A (en) * 2008-12-04 2009-05-27 浙江大学 System for removing nitrous oxides in low-temperature flue gas and technique thereof
CN202860406U (en) * 2012-08-06 2013-04-10 浙江海亮环境材料有限公司 SCR flue gas denitrating device for glass kiln
CN103349898A (en) * 2013-07-04 2013-10-16 张蕊 SNCR (Selective Non-catalytic Reduction) denitration device and denitration method
CN203501199U (en) * 2013-08-30 2014-03-26 安徽省元琛环保科技有限公司 NOx-controlled denitrification device of glass kiln

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0599547A1 (en) * 1992-11-27 1994-06-01 Pilkington Glass Limited Glass furnaces
CN1203890A (en) * 1997-05-05 1999-01-06 Ppg工业公司 Reduction of Nox emissions in glass melting furnace
CN101439260A (en) * 2008-12-04 2009-05-27 浙江大学 System for removing nitrous oxides in low-temperature flue gas and technique thereof
CN202860406U (en) * 2012-08-06 2013-04-10 浙江海亮环境材料有限公司 SCR flue gas denitrating device for glass kiln
CN103349898A (en) * 2013-07-04 2013-10-16 张蕊 SNCR (Selective Non-catalytic Reduction) denitration device and denitration method
CN203501199U (en) * 2013-08-30 2014-03-26 安徽省元琛环保科技有限公司 NOx-controlled denitrification device of glass kiln

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105169919A (en) * 2015-10-09 2015-12-23 索通发展股份有限公司 Flue gas denitration device for carbon pot calciner and denitration technology of flue gas denitration device
CN108786428A (en) * 2018-06-07 2018-11-13 光大环保技术研究院(南京)有限公司 A kind of SNCR denitration optimal control system and control method

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Application publication date: 20150422