CN104076123A - Experiment system for researching release characteristic of mercury in mixed combustion smoke of sludge and coal - Google Patents
Experiment system for researching release characteristic of mercury in mixed combustion smoke of sludge and coal Download PDFInfo
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- CN104076123A CN104076123A CN201410243504.6A CN201410243504A CN104076123A CN 104076123 A CN104076123 A CN 104076123A CN 201410243504 A CN201410243504 A CN 201410243504A CN 104076123 A CN104076123 A CN 104076123A
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Abstract
The invention relates to an experiment system for researching the release characteristic of mercury in mixed combustion smoke of sludge and coal. The system comprises a dropper furnace system, an air-distribution subsystem and a measuring subsystem, wherein the dropper furnace system comprises a dropper furnace, a power micro-feeder and a furnace temperature control system; the power micro-feeder is used for outputting powder to a corundum pipe in the dropper furnace through a pipeline, and the furnace temperature control system is used for controlling the temperature rise speed rate and the in-furnace temperature by virtue of a heating wire in the dropper furnace; the air-distribution subsystem comprises a plurality of gas cylinders which are communicated to a gas mixing tank through output pipelines respectively, pressure reducing valves and flow meters are arranged on the output pipelines of the gas cylinders and are used for controlling the output flow of the gas cylinders, and the gas output by the gas mixing tank is conveyed to the corundum pipe in the dropper furnace through the pipeline provided with a mass flow meter; the measuring subsystem comprises a probing gun, an umbilical cord connecting pipe, a filter and a condensing-absorbing system, which are sequentially connected with one another through the pipelines, the probing gun is inserted into the corundum pipe, and the probing gun, the umbilical cord connecting pipe and the filter are provided with heating control systems. The system is simple and is single in variable, and the theoretical basis can be provided for the mixed combustion industrialization and harmless production of the sludge and the coal of a practical coal-fired power plant by virtue of an experiment result.
Description
Technical field
The present invention relates to the research experiment system of a kind of mud and coal mixed combustion mercury in flue gas release characteristics.
Background technology
Along with the increase of Chinese society expanding economy and urban population, within 2010, quantity of wastewater effluent reaches 4.40 * 10
10m
3/ d, estimates that the year two thousand twenty quantity of wastewater effluent will reach 5.36 * 10
10m
3/ d, therefore at least produces 5,000,000 tons of mud every year.The method of disposal of mud is the row of mainly containing sea, landfill, agricultural, burning etc. at present.Compare with front 3 kinds of methods of disposal, incineration disposal has the remarkable advantage of minimizing, innoxious and resource.Again because sludge calorific value is very low, generally smooth combustion separately.Therefore,, in commercial Application device, conventionally adopt the mode of mud and coal mixed combustion to carry out the incineration disposal of mud.
Mercury is as the newly-increased limit row standard of thermal power plant's pollutant emission standard (GB13223-2011), be a kind of hypertoxicity material, because it easily gathers in vivo, be difficult to be hunted down, and atmospheric residence time is long, be therefore subject to countries in the world researcher's great attention.In atmosphere, the topmost source of mercury is to produce from coal combustion.And mud is because deriving from sanitary sewage, industrial sewage, its content of beary metal is higher.Therefore mud and raw coal are mixed in burning process, also will pay close attention to the conversion Transport of its mercury in flue gas, thereby adjustment coal-burning power plant's mud and coal are mixed the method for in burning process, pollutant being processed, in order to avoid cause secondary pollution.
Mud and coal are mixed and in burning process, are produced gaseous mercury in flue gas and mainly with 2 kinds of forms, exist: element mercury (Hg0) and oxidation state mercury (Hg2+).Mercury species has different physics and chemistry character.Hg2+ is soluble in water, therefore Hg2+ can remove with wet type fume sweetening device (WFGD).And Hg0 has higher saturated vapour pressure under kitchen air contaminant control equipment operating temperature and high pressure, highly volatile and be insoluble in water.Select mud and coal mixed combustion process in drop tube furnace simulated hearth, it possesses the advantages such as simple in structure, combustion temperature in hearth is higher and programming rate is fast, the secondary reaction of active volatile matter is little, can simulate the condition of coal-burning boiler burner hearth high temperature conflagration.
Therefore, mercury release characteristics at testing table experiment Analysis research mud and coal mixed combustion generation flue gas, for mud and the application of coal mixed combustion large-scale industrial production, also for sewage sludge harmlessness, recycling treatment are taken a firm foundation and had important practical significance.
Summary of the invention
Technical matters to be solved by this invention, just be to provide the research experiment system of a kind of mud and coal mixed combustion mercury in flue gas release characteristics, the present invention can finely study mud and coal mixed combustion mercury in flue gas release characteristics surely, and then is that actual coal fired power plant is carried out mud and coal mixed combustion industrialization, innoxious production are provided fundamental basis.
Solve the problems of the technologies described above, the technical solution used in the present invention is:
A research experiment system for mud and coal mixed combustion mercury in flue gas release characteristics, is characterized in that: comprise drop tube furnace subsystem, air distribution subsystem and measurement subsystem;
Described drop tube furnace subsystem comprises drop tube furnace 8, micro-machine supplying powder 7 and Furnace Temperature Control System 13, trace machine supplying powder is evenly exported powder to alundum tube 9 in drop tube furnace by setting value through pipeline, Furnace Temperature Control System is controlled temperature in heating rate and stove by the heating wire in drop tube furnace;
Described air distribution subsystem comprises the some gas cylinders 1,2 that respectively have output channel to be communicated to mixed gas tank 5, on the output channel of each gas cylinder, be all provided with reduction valve and flowmeter 3,4 and control the delivery rate of gas cylinders, the output of mixed gas tank is delivered in drop tube furnace 8 in alundum tube 9 through the pipeline of mass flowmeter 6 is housed;
Described measurement subsystem comprises spy rifle 10, connection umbilical duct 11, filtrator 12 and the condensation absorption system 14 connecting successively with pipeline, in drop tube furnace described in spy rifle 10 inserts, in alundum tube 9, described spy rifle, connection umbilical duct and filtrator are provided with heating control system 15.(coal ash is filtered out by filtrator, and flue gas enters condensation absorption system by filtrator.)
Described condensation absorption system 14 comprises first to the 6th Drexel bottle 1401,1402,1403,1404,1405 and 1406 being immersed in ice bath connecting successively with pipeline.KCl solution is equipped with in first, second Drexel bottle 1401,1402; 5%v/v HNO is equipped with in the 3rd Drexel bottle 1403
3-10%v/v H
2o
2solution; Four, 4%w/v KMnO is equipped with in the 5th Drexel bottle 1404,1405
4-10%v/v H
2sO
4solution; It is 6-16 object silica gel that particle size is equipped with in the 6th Drexel bottle 1406.
Described spy rifle 14 is that quartz high temperature resistant, that be difficult for staining and ungentle sample reacts is visited rifle, long 450mm.
Described filtrator 12 is the husky core filtrator of borosilicate glass.
Described connection umbilical duct 11 is teflon pipeline, and this pipe is heated to 120 ℃ in experimentation, to prevent water and acid cure knot.
Described spy rifle, connection umbilical duct and filtrator heating control system 15 are temperature control electric heating system, and heating-up temperature maintains 120 ℃.
The present invention has following beneficial effect:
(1) experimental technique and experimental system are simple, easy to operate, can realize unitary variant and control.
(2) can simulate in actual coal fired power plant operational process due to coal type change, mud mixed-fuel burning proportion changes, and fire box temperature changes, the impact on mud and coal combustion flue gas mercury release characteristics such as different combustion atmosphere variations.
(3) can simulate the combustion process of actual boiler furnace, more approaches engineering is actual.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
Fig. 1 is mud and coal mixed combustion mercury in flue gas release characteristics research experiment system schematic;
Fig. 2 is condensation absorption system structural representation.
In figure, 1-welding bottle, 2-nitrogen cylinder, 3-reduction valve, 4-flowmeter, 5-mixes gas tank, 6-mass flowmeter, 7-trace machine supplying powder, 8-drop tube furnace body of heater, 9-alundum tube, 10-visits rifle, and 11-connects umbilical duct, 12-filtrator, 13-body of heater control system, 14-condensation absorption system, 15-visits rifle, connects umbilical duct and filtrator heating control system; 1401,1402-is equipped with first, second Drexel bottle of KCl solution, and 1403-is equipped with 5%v/v HNO
3-10%v/v H
2o
2the 3rd Drexel bottle of solution, 1404,1405-is equipped with 4%w/v KMnO
4-10%v/v H
2sO
4the the 4th, the 5th Drexel bottle of solution, 1406-is equipped with the 6th Drexel bottle that particle size is 6-16 object silica gel, 1407-ice bath case.
Embodiment
As shown in Figure 1, the research experiment system embodiment of mud of the present invention and coal mixed combustion mercury in flue gas release characteristics, comprises drop tube furnace subsystem, air distribution subsystem and measurement subsystem.
Drop tube furnace subsystem comprises drop tube furnace 8, micro-machine supplying powder 7 and Furnace Temperature Control System 13, trace machine supplying powder is evenly exported powder to alundum tube 9 in drop tube furnace by setting value through pipeline, Furnace Temperature Control System is controlled temperature in heating rate and stove by the heating wire in drop tube furnace; Air distribution subsystem comprises the some gas cylinders 1,2 that respectively have output channel to be communicated to mixed gas tank 5, on the output channel of each gas cylinder, be all provided with reduction valve and flowmeter 3,4 and control the delivery rate of gas cylinders, the output of mixed gas tank is delivered in drop tube furnace 8 in alundum tube 9 through the pipeline of mass flowmeter 6 is housed; Measurement subsystem comprises spy rifle 10, connection umbilical duct 11, filtrator 12 and the condensation absorption system 14 connecting successively with pipeline, visiting rifle 10 inserts in described drop tube furnace in alundum tube 9, visiting rifle 14 is that quartz high temperature resistant, that be difficult for staining and ungentle sample reacts is visited rifle, long 450mm, filtrator 12 is the husky core filtrator of borosilicate glass, connecting umbilical duct 11 is teflon pipeline, and this pipe is heated to 120 ℃ in experimentation, to prevent water and acid cure knot; Visit rifle, connection umbilical duct and filtrator and be provided with heating control system 15, it is temperature control electric heating system, and heating-up temperature maintains 120 ℃.
Condensation absorption system 14 comprises first to the 6th Drexel bottle 1401,1402,1403,1404,1405 and 1406 being immersed in ice bath connecting successively with pipeline, and KCl solution is equipped with in first, second Drexel bottle 1401,1402; 5%v/v HNO is equipped with in the 3rd Drexel bottle 1403
3-10%v/v H
2o
2solution; Four, 4%w/vKMnO is equipped with in the 5th Drexel bottle 1404,1405
4-10%v/v H
2sO
4solution; It is 6-16 object silica gel that particle size is equipped with in the 6th Drexel bottle 1406.
According to experiment, need, regulate enter mixed gas tank 5 gas flow ratio (as air atmosphere, oxygen: nitrogen=21:79).Gas, after mixed gas tank 5 mixes, regulates by mass flowmeter 6 gas flow that enters drop tube furnace.This is the air distribution subsystem of mud and coal mixed combustion mercury in flue gas release characteristics experimental system.
Gas carries micro-machine supplying powder 7 evenly exports powder by setting value, sends into drop tube furnace body of heater 8, and after the high-temp combustion in alundum tube 9, flue gas enters the spy rifle 10 in measurement subsystem.Temperature in body of heater control system 13 capable of controlling dropping pipe furnace heating rates and stove.
High-temperature flue gas is successively by visiting rifle 10, connecting umbilical duct 11, filtrator 12 and condensation absorption system 14.Flue gas filters out flue dust in filtrator 12, finally enters condensation absorption system 14 and is absorbed by solution wherein.
Visit rifle, connect umbilical duct and filtrator heating control system 15 is guaranteed to visit rifle 10, connected umbilical duct 11 in experimentation, filtrator 12 heating-up temperatures maintain 120 ℃.
Flue gas is condensed absorption system 14 absorptions as shown in Figure 2, mercury in flue gas is divided into element mercury (Hg0) and oxidation state mercury (Hg2+), oxidation state mercury (Hg2+) absorbs in the Drexel bottle 1401,1402 that KCl solution is housed, and element mercury is water insoluble, in Drexel bottle 1401,1402, be therefore the content of oxidation state mercury in flue gas; Element mercury is being equipped with 5%v/v HNO
3-10%v/vH
2o
2the Drexel bottle 1403 of solution is oxidized to mercury oxide, so water soluble, by solution, absorbed, thereafter 4%w/vKMnO is housed
4-10%v/v H
2sO
4the Drexel bottle 1404,1405 of solution is also oxidation and absorbs element mercury, so the mercury absorbing in Drexel bottle 1403,1404,1405 solution is the content of element mercury in flue gas; The solution droplets that the Drexel bottle 1406 of particle size being finally housed being 6-16 object silica gel absorbs moisture in flue gases or takes out of in Drexel bottle.All Drexel bottles all by ice bath in ice bath case.
Claims (6)
1. a research experiment system for mud and coal mixed combustion mercury in flue gas release characteristics, is characterized in that: comprise drop tube furnace subsystem, air distribution subsystem and measurement subsystem;
Described drop tube furnace subsystem comprises drop tube furnace (8), micro-machine supplying powder (7) and Furnace Temperature Control System (13), trace machine supplying powder is evenly exported powder to alundum tube (9) in drop tube furnace by setting value through pipeline, Furnace Temperature Control System is controlled temperature in heating rate and stove by the heating wire in drop tube furnace;
Described air distribution subsystem comprises the some gas cylinders (1,2) that respectively have output channel to be communicated to mixed gas tank (5), on the output channel of each gas cylinder, be all provided with reduction valve and flowmeter (3,4) and control the delivery rate of gas cylinder, the output of mixed gas tank is delivered in drop tube furnace (8) in alundum tube (9) through the pipeline of mass flowmeter (6) is housed;
Described measurement subsystem comprises spy rifle (10), connection umbilical duct (11), filtrator (12) and the condensation absorption system (14) connecting successively with pipeline, in drop tube furnace described in spy rifle (10) inserts, in alundum tube (9), described spy rifle, connection umbilical duct and filtrator are provided with heating control system (15).
2. the research experiment system of mud according to claim 1 and coal mixed combustion mercury in flue gas release characteristics, it is characterized in that: described condensation absorption system (14) comprises first to the 6th Drexel bottle (1401,1402,1403,1404,1405 and 1406) being immersed in ice bath connecting successively with pipeline, and KCl solution is equipped with in first, second Drexel bottle (1401,1402); 5%v/v HNO is equipped with in the 3rd Drexel bottle (1403)
3-10%v/v H
2o
2solution; Four, 4%w/v KMnO is equipped with in the 5th Drexel bottle (1404,1405)
4-10%v/v H
2sO
4solution; It is 6-16 object silica gel that particle size is equipped with in the 6th Drexel bottle (1406).
3. the research experiment system of mud according to claim 2 and coal mixed combustion mercury in flue gas release characteristics, is characterized in that: described spy rifle (14) is that quartz high temperature resistant, that be difficult for staining and ungentle sample reacts is visited rifle, long 450mm.
4. the research experiment system of mud according to claim 3 and coal mixed combustion mercury in flue gas release characteristics, is characterized in that: described filtrator (12) is the husky core filtrator of borosilicate glass.
5. the research experiment system of mud according to claim 4 and coal mixed combustion mercury in flue gas release characteristics, is characterized in that: described connection umbilical duct (11) is teflon pipeline, and this pipe is heated to 120 ℃ in experimentation.
6. the research experiment system of mud according to claim 5 and coal mixed combustion mercury in flue gas release characteristics, it is characterized in that: described spy rifle, connection umbilical duct and filtrator heating control system (15) are temperature control electric heating system, and heating-up temperature maintains 120 ℃.
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Cited By (5)
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| CN109012555A (en) * | 2018-10-15 | 2018-12-18 | 武汉亚华电炉有限公司 | A kind of drop tube furnace |
| CN109931795A (en) * | 2019-03-07 | 2019-06-25 | 安徽工业大学 | The test application method of drop tube furnace |
| CN110274986A (en) * | 2019-06-27 | 2019-09-24 | 河南省科学院能源研究所有限公司 | A kind of experimental method and device of biological fuel gas and coal coupling combustion |
| CN114740140A (en) * | 2022-04-01 | 2022-07-12 | 中国科学院过程工程研究所 | System device for researching influence of sludge on combustion and operation method and application thereof |
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Application publication date: 20141001 |