CN103913548B - A kind of experimental provision and experimental technique studying SNCR performance in New Type Dry-process Cement Production dore furnace - Google Patents
A kind of experimental provision and experimental technique studying SNCR performance in New Type Dry-process Cement Production dore furnace Download PDFInfo
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- CN103913548B CN103913548B CN201410138002.7A CN201410138002A CN103913548B CN 103913548 B CN103913548 B CN 103913548B CN 201410138002 A CN201410138002 A CN 201410138002A CN 103913548 B CN103913548 B CN 103913548B
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Abstract
The invention discloses a kind of experimental provision and the experimental technique of studying SNCR performance in New Type Dry-process Cement Production dore furnace, described experimental provision is made up of distribution unit, reaction member and sampling analysis unit three part, and distribution unit is made up of source of the gas, mass flow controller, mixing tank and peristaltic pump.Reaction member forms by simulating the quartz reactor of dore furnace, vertical tubular electric furnace and temperature controller.Sampling analysis unit is made up of bubble absorption pipe, atmosphere sampling instrument and flue gas analyzer.Distribution in the present invention with reference to the actual atmospheric condition in manufacture of cement dore furnace, comprise solid material condition, compared with testing with fixed bed of the prior art, the present invention can gas-solid contact state better in Simulated Water stall dore furnace, increase gas-solid contact time, make test the data obtained and truth more identical.Thus the present invention has more comprehensive and practicality.
Description
Technical field
The present invention relates to a kind of experimental provision and the method for studying SNCR performance in New Type Dry-process Cement Production dore furnace.
Background technology
Cement industry is one of most important starting material manufacture of China.Due to the high temperature of cement production process and the burning of nitrogenous fuel, cement kiln end can discharge a large amount of oxides of nitrogen.The nitrogen oxide emission of current China cement industry is only second to Thermal Power Generation Industry and transportation, becomes the third-largest oxides of nitrogen manual emission source.And national cement industry pollutant emission standard is also increasingly strict to the emission limit of oxides of nitrogen.The application of denitration technology in cement industry receives publicity day by day.China's cement kiln denitration technology is also in the starting stage, and the denitration mode exploring economical and efficient is the main direction of studying in this field.
SNCR (selectivenon-catalyticreduction, SNCR) is a kind of method of denitration utilizing nitrogenous reducing agent nitrogen oxides reduction under preference temperature of 20 century 70 foreign scholar inventions.The method has been tending towards ripe in the application of the industries such as thermoelectricity.In new dry process rotary kiln, the temperature of dore furnace and gas residence time be able to meet the technological requirement of SNCR, therefore it should be noted that feasibility SNCR being applied to cement kiln dore furnace.Have the engineering project of the cement mill of application SNCR denitration external morning, but these projects denitration effect is separately widely different.Main cause is that the gaseous environment in cement kiln dore furnace is complicated, and the raw material dust containing high concentration, by the impact of the factors such as operating conditions, in dore furnace, also there were significant differences for the condition of different parts, and these conditions all can the denitration effect of appreciable impact SNCR.The application of SNCR on cement kiln how is made to become the more economical problem efficiently becoming people and pay close attention to.And explore the influence factor of SNCR performance in cement kiln dore furnace and the realization of influence mode to this target has directive significance.Though current Chinese scholars is more about the influence research of gaseous component to SNCR, but great majority research is not for cement decomposing furnace, so atmospheric condition does not conform to the atmosphere in manufacture of cement dore furnace, research conclusion is not exclusively applicable to the SNCR process in dore furnace.At present little to the influence research of SNCR about cement slurry, and the reactor overwhelming majority that researcher adopts is fixed bed reactors, material and gas short for duration of contact, the situation that raw material in cement decomposing furnace spurt can not be simulated well.
Summary of the invention
The present invention aims to provide a kind of experimental provision and the experimental technique of studying SNCR performance in New Type Dry-process Cement Production dore furnace.The distribution of described experimental provision with reference to the actual atmospheric condition in manufacture of cement dore furnace, and the atmosphere of different parts in dore furnace can be simulated by the concentration changing each gaseous component, change the impact of reductive agent point of addition on SNCR performance to investigate in Practical Project.The solid material of this experimental provision selects one or more components in cement slurry to be configured, and can to investigate in dore furnace in cement slurry each component to the impact of SNCR performance.Compared with testing with fixed bed, this experimental provision and experimental technique can be simulated cement produced with the dry method better and be produced gas-solid contact state in dore furnace, increase gas-solid contact time, make test the data obtained and truth more identical.Thus the present invention has more comprehensive and practicality.
First the present invention provides a kind of experimental provision for studying SNCR performance in New Type Dry-process Cement Production dore furnace, and described experimental provision is made up of three parts, is respectively distribution unit, reaction member and sampling analysis unit.
Distribution unit is made up of source of the gas (comprising the gas cylinder of air compressor machine and the various calibrating gas of storage), mass flow controller, mixing tank and peristaltic pump.Gas composition in source of the gas except water vapor comes from air compressor machine and gas cylinder, and the water vapor in source of the gas then water is quantitatively injected gas circuit with peristaltic pump and at high temperature vaporization provides.The flow of source gas is accurately controlled by mass flow controller.Mixing tank is used for each gas composition fully to mix.The gas circuit of connecting components adopts teflon hose or stainless-steel tube, to reduce the impact of the physical reaction between tube wall and gas on gas composition.
Reaction member forms by simulating the quartz reactor of dore furnace, vertical tubular electric furnace and temperature controller.Quartz reactor is internal and external casing structure, and has two air intake openings.Simulated flue gas enters outer tube by lower end air intake opening, and reductibility air-flow enters interior pipe by upper end air intake opening, and two strands of air-flows have respective preheating section.Interior pipe end is positioned at outer tube, and interior pipe sidewall uniform pore openings, the gas in interior pipe diffuses into outer tube by side-wall hole, fully mixes to make two strands of air-flows and reacts.Have the quartz sand sieve plate of load bearing solid material in quartz reactor, and quartz sand sieve plate is positioned at the top of air-flow mixing place, and is fixed between outer tube wall and outer wall of inner tube.Solid material in quartz sand sieve plate can blow to suspended state by the combination gas moved upward in outer tube.Quartz reactor topmost is the spherical gas solid separation room that radius is greater than outer tube caliber.Top, spherical gas solid separation room is provided with gas outlet.The end of gas outlet adopts standard frosted mouth to be connected with follow-up glass tube.Gas outlet is also as the reinforced of solid material and discharge port simultaneously.Quartz reactor is by vertical tubulose heating by electric cooker, and temperature is regulated and controled by thermopair coupling automatic temperature control instrument.
Sampling analysis unit is made up of bubble absorption pipe, atmosphere sampling instrument and flue gas analyzer.Gas sampling point is provided with in the position near quartz reactor lower end air intake opening and gas outlet.The ammonia bubble absorption pipe and atmosphere sampling instrument filling quantitative sulfuric acid absorption liquid is sampled, and detects with Berthelot spectrophotometry; The concentration of oxygen, oxides of nitrogen, carbon monoxide, sulphuric dioxide is then measured by flue gas analyzer.
The present invention also provides a kind of experimental technique adopting SNCR performance in research New Type Dry-process Cement Production dore furnace, specifically comprises the steps:
A the solid material of quantitative simulation cement raw material component is joined the outer tube of quartz reactor by () from the gas outlet of quartz reactor, rapping quartz reactor outer tube gently, makes solid material be uniformly distributed in quartz sand sieve plate.
B () connects gas circuit.Instrument start preheating, arranges thermopair coupling automatic temperature control instrument heating schedule.
C heating schedule that () starts thermopair coupling automatic temperature control instrument starts heating.Only in quartz reactor, pass into the air suitable with empirical flow simultaneously.
When () heating schedule is raised to assigned temperature and waits temperature stabilization in quartz reactor d, by gaseous component empirically research purpose be adjusted to experiment value, and after balance to be achieved, the concentration of each gas composition of sampling analysis.
E () experiment terminates rear air blowing quartz reactor, close each instrument, is drawn off by solid material after quartz reactor cooling.
F () is according to research needs, change solid material, gas phase composition, point of addition and temperature of reaction, repeat the step of (a) ~ (e), thus set up the relation between each influence factor and SNCR denitration performance (comprising denitration efficiency, the escaping of ammonia).Described influence factor comprises solid material component, gas phase composition, the point of addition of reductive agent and temperature of reaction.
Advantage of the present invention is:
The configuration of gas and solid material with reference to cement produced with the dry method respectively and produces actual atmospheric condition in dore furnace and cement slurry composition.Compared with testing with fixed bed of the prior art, the present invention can gas-solid contact state better in Simulated Water stall dore furnace, increases gas-solid contact time, make test the data obtained and truth more identical.Thus the present invention has more comprehensive and practicality.
Accompanying drawing explanation
Fig. 1 is the structure composition schematic diagram of experimental provision of the present invention;
Fig. 2 is quartz reactor structural representation of the present invention.
In figure:
1. gas cylinder; 2. air compressor machine; 3. mass flow controller; 4. water or reductant solution;
5. peristaltic pump; 6. mixing tank; 7. quartz reactor; 8. vertical tubular electric furnace;
9. thermopair; 10. automatic temperature control instrument; 11. bubble absorption pipes; 12. atmosphere sampling instruments;
13. flue gas analyzers; 14. lower end air intake openings; 15. upper end air intake openings; 16. outer tubes;
Pipe in 17.; 18. quartz sand sieve plate; 19. conversion zones; 20. gas solid separation rooms;
21. gas outlets.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
First the present invention provides a kind of experimental provision studying SNCR performance in New Type Dry-process Cement Production dore furnace, and described experimental provision is made up of three parts, is respectively distribution unit, reaction member and sampling analysis unit.
As shown in Figure 1, distribution unit is made up of source of the gas (being provided by the gas cylinder 1 and air compressor machine 2 that store various calibrating gas), mass flow controller 3, mixing tank 6 and peristaltic pump 5.Nitrogen, carbon dioxide, carbon monoxide, sulphuric dioxide and nitrogen monoxide in gaseous reducing agent ammonia and simulated flue gas come from gas cylinder 1, oxygen in simulated flue gas comes from air compressor machine 2, and often kind of gas controls flow by respective mass flow controller 3 respectively.The flow of water or reductant solution 4 is controlled by peristaltic pump 5.The each component of simulated flue gas and oxygen after respective mass flow controller 3, enter quartz reactor 7 before, be introduced into mixing tank 6 and fully mix to make each gas composition.Ammonia is directly entered by the upper end air intake opening 15 of quartz reactor 7, and water or reductant solution 4 are entered by the upper end air intake opening 15 also by quartz reactor 7 after peristaltic pump 5.For reducing gas piping to the impact of gas composition, the gas circuit between connecting components adopts teflon hose or stainless-steel tube.
Reaction member forms by simulating the quartz reactor 7 of dore furnace, vertical tubular electric furnace 8 and temperature controller 10.As shown in Figure 2, quartz reactor 7 is internal and external casing structure, and has two gas accesses, is respectively the lower end air intake opening 14 being communicated with outer tube 16 and the upper end air intake opening 15 being communicated with interior pipe 17.Simulated flue gas in mixing tank 6 enters outer tube 16 by lower end air intake opening 14.Water or reductant solution 4 are injected into interior pipe 17 by upper end air intake opening 14, after water or reductant solution 4 enter interior pipe 17, and at high temperature rapid vaporization, and be brought into bottom interior pipe 17 by the ammonia air-flow entered by upper end air intake opening 15.Outer tube 16 is the preheating bringing-up section of reductive agent air-flow in the part of quartz sand sieve plate less than 18 and interior pipe 17 whole tube section.It is inner that interior pipe 17 end is positioned at outer tube 16, and interior pipe 17 end sidewall uniform pore openings, reductive agent air-flow is diffused into outside interior pipe 17 by the side-wall hole on interior pipe 17, fully mixes with the simulated flue gas in outer tube 16.Have the quartz sand sieve plate 18 of load bearing solid material in quartz reactor 7, and quartz sand sieve plate 18 is positioned at the top (i.e. the top position of pipe 17 end side-wall hole) of air-flow mixing place.Mixed gas upwards flows through quartz sand sieve plate 18 and blows to fluidisation state by the solid material on it, and each gaseous component and solid material are positioned at the top position of the quartz sand sieve plate 18 of outer tube 16 inside at conversion zone 19() occur pure gas phase and under solid material surface catalysis SNCR reaction.The solid material of reacted gas and part small particle diameter enters the gas solid separation room 20 of quartz reactor 7 topmost.Described gas solid separation room 20 is greater than the spheroid form of outer tube 16 external diameter for cross section diameter, and gas flow rate declines herein, and the small particle size solid material being brought to this place is deposited to the inwall of separation chamber 20 and conversion zone 19 is returned in landing.Gas is then discharged by the gas outlet 21 at top, gas solid separation room 20.Because the gas temperature of gas outlet 21 is high, should not connect with flexible pipe and common cutting ferrule, the end of gas outlet 21 is connected with follow-up glass tube with standard frosted mouth.Gas outlet 21 is simultaneously also as charge door and the discharge port of solid material.For investigating the reaction time, reaction mechanism being inquired on the impact of SNCR performance, in experiment, also can utilize the quartz reactor 7 that quartz sand sieve plate 18 is highly different to carry out experimental study.As shown in Figure 1, the position that quartz reactor 7 is positioned at gas solid separation room less than 20 is heated by vertical tubular electric furnace 8, and the thermometric end of thermopair 9 is placed in the middle part of reactor outer tube 16 outer wall and the automatic temperature control instrument 10 that is coupled regulates and controls the temperature of vertical tubular electric furnace 8.
Sampling analysis unit is made up of bubble absorption pipe 11, atmosphere sampling instrument 12 and flue gas analyzer 13.Gas sampling point is provided with in the position near quartz reactor 7 lower end air intake opening 14 and gas outlet 21.The ammonia bubble absorption pipe 11 and atmosphere sampling instrument 12 filling quantitative sulfuric acid absorption liquid is sampled, and detects with Berthelot spectrophotometry; The concentration of oxygen, oxides of nitrogen, carbon monoxide, sulphuric dioxide is then measured by flue gas analyzer 13.
Below by embodiment, experimental technique provided by the invention is described.
With funnel, the solid material of quantitative simulation cement raw material component is joined outer tube 16 inside of quartz reactor 7 from gas outlet 21 on quartz reactor 7, the outer tube 16 of rapping quartz reactor 7 gently, makes solid material be uniformly distributed in quartz sand sieve plate 18.
Be connected between gas cylinder 1, air compressor machine 2, mass flow controller 3, mixing tank 6, quartz reactor 7 and sampling analysis unit with adapter with teflon hose.The power supply opening air compressor machine 2 and mass flow controller 3 carries out preheating, arranges the heating schedule of temperature controller 10.
Start heating schedule to start to heat quartz reactor 7.Only in quartz reactor 7, pass into the air suitable with empirical flow simultaneously, comparatively fast stablize to Temperature Distribution during experiment to make the Temperature Distribution in quartz reactor 7.
When heating schedule is raised to assigned temperature and waits temperature stabilization in quartz reactor 7, by mass flow controller 3 and peristaltic pump 5, the flow of each simulated flue gas, reductive agent and water or reductant solution is adjusted to experiment value, after reaction in quartz reactor 7 balances gradually, start the concentration of each gas composition of sampling analysis.
Test unit carries out in process of the test, according to content of the test, if select to adopt ammonia as reductive agent, water is pumped into quartz reactor 7 upper end air intake opening 15 pipeline by peristaltic pump 5, if select the solution such as ammoniacal liquor or urea liquid as reductive agent, then close ammonia gas cylinder, reductant solution is directly pumped into quartz reactor 7 upper end air intake opening 15 pipeline by peristaltic pump 5.
Experiment terminates rear air blowing quartz reactor 7, closes instrument, is drawn off by solid material after quartz reactor 7 cools from gas outlet 21.
Gather by the gas of sampling analysis unit to the lower end air intake opening 14 of adaptive response device 7 and gas outlet 21 place and analyze in process of the test, obtaining required test figure.
Experimental provision provided by the invention and experimental technique, by changing the reaction conditions such as gas phase and solid phase components, temperature of reaction, reductive agent kind flexibly, can show that these conditions are formed the denitration efficiency of SNCR, reaction product and the impact of the escaping of ammonia.Compared with traditional fixture bed experiment apparatus and method, this experimental provision and method make solid material be in fluidisation state, the state of manufacture of cement dore furnace inside can be simulated better, make test the data obtained and truth more identical, thus more comprehensively and particularly rational Optimizing Suggestions is proposed to the operation of SNCR in Practical Project.
Claims (2)
1. study the experimental provision that SNCR performance in dore furnace produced by cement produced with the dry method, it is characterized in that: described experimental provision is made up of three parts, be respectively distribution unit, reaction member and sampling analysis unit; In described distribution unit, reaction member and sampling analysis unit, the gas circuit of connecting components adopts teflon hose or stainless-steel tube;
Distribution unit is made up of source of the gas, mass flow controller, mixing tank and peristaltic pump, gas composition in source of the gas except water vapor comes from air compressor machine and gas cylinder, and the water vapor in source of the gas then water is quantitatively injected gas circuit with peristaltic pump and at high temperature vaporization provides; The flow of source gas is controlled by mass flow controller; Mixing tank is used for each gas composition fully to mix;
Reaction member forms by simulating the quartz reactor of dore furnace, vertical tubular electric furnace and temperature controller; Quartz reactor is internal and external casing structure, and has two air intake openings, is respectively interior pipe upper end air intake opening and outer tube lower end air intake opening; Simulated flue gas enters outer tube by lower end air intake opening, and reductibility air-flow enters interior pipe by upper end air intake opening; Interior pipe end is positioned at outer tube, and the sidewall uniform pore openings of interior pipe end, the gas in interior pipe diffuses into outer tube by side-wall hole, fully mixes to make two strands of air-flows and reacts; Have the quartz sand sieve plate of load bearing solid material in quartz reactor, and quartz sand sieve plate is positioned at the top of air-flow mixing place, and is fixed between outer tube wall and outer wall of inner tube; Solid material in quartz sand sieve plate can blow to suspended state by the combination gas moved upward in outer tube; Quartz reactor topmost is the spherical gas solid separation room that cross section diameter is greater than outer tube caliber, top, spherical gas solid separation room is provided with gas outlet, the end of gas outlet adopts standard frosted mouth to be connected with follow-up glass tube, and gas outlet is also as the reinforced of solid material and discharge port simultaneously; Quartz reactor is by vertical tubulose heating by electric cooker, and temperature is regulated and controled by thermopair coupling automatic temperature control instrument;
Nitrogen, carbon dioxide, carbon monoxide, sulphuric dioxide, nitrogen monoxide and oxygen is comprised in described simulated flue gas;
Sampling analysis unit is made up of bubble absorption pipe, atmosphere sampling instrument and flue gas analyzer, is provided with gas sampling point in the position near quartz reactor lower end air intake opening and gas outlet; The ammonia bubble absorption pipe and atmosphere sampling instrument filling quantitative sulfuric acid absorption liquid is sampled, and detects with Berthelot spectrophotometry; The concentration of oxygen, oxides of nitrogen, carbon monoxide, sulphuric dioxide is then measured by flue gas analyzer.
2. adopt research cement produced with the dry method to produce an experimental technique for SNCR performance in dore furnace, it is characterized in that: the experimental provision provided in claim 1 is provided, specifically comprises the steps:
A the solid material of quantitative simulation cement raw material component is joined the outer tube of quartz reactor by () from the gas outlet of quartz reactor, make solid material be uniformly distributed in quartz sand sieve plate;
B () connects gas circuit, instrument start preheating, arranges thermopair coupling automatic temperature control instrument heating schedule;
C heating schedule that () starts thermopair coupling automatic temperature control instrument starts heating, only in quartz reactor, passes into the air suitable with empirical flow simultaneously;
D () heating schedule is raised to assigned temperature and in quartz reactor during temperature stabilization, by gaseous component empirically research purpose be adjusted to experiment value, and after balance to be achieved, the concentration of each gas composition of sampling analysis;
E () experiment terminates rear air blowing quartz reactor, close each instrument, is drawn off by solid material after quartz reactor cooling;
F (), according to research needs, changes solid material component, gas phase composition and temperature of reaction, repeats the step of (a) ~ (e), thus set up the relation between each influence factor and SNCR denitration performance; Described influence factor comprises solid material component, gas phase composition, the point of addition of reductive agent and temperature of reaction.
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| CN105785942B (en) * | 2014-12-26 | 2018-09-14 | 中国二十冶集团有限公司 | Large-scale cement produced with the dry method scattered control system packet joining adjustment method |
| CN107192795B (en) * | 2017-06-27 | 2023-09-19 | 广东万引科技发展有限公司 | Experimental device and method for researching decomposition of sulfur-containing minerals in cyclone preheater |
| CN109060704A (en) * | 2018-08-13 | 2018-12-21 | 中国华能集团有限公司 | A kind of SNCR denitration engineering test platform |
| CN109387465A (en) * | 2018-11-09 | 2019-02-26 | 上海电力学院 | A kind of experiment porch for simulating coal-fired plant flue gas pollutant removing |
| CN110297008B (en) * | 2019-08-02 | 2024-03-08 | 南京工业大学 | Solid combustible controllable atmosphere pyrolysis test system and test method |
| CN112444595A (en) * | 2019-08-29 | 2021-03-05 | 国家能源投资集团有限责任公司 | Device and method for jointly evaluating activity of denitration and demercuration catalyst |
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