CN208349860U - The system of cement kiln, furnace separation pyrolyzing disposition cyanide polluted soil - Google Patents
The system of cement kiln, furnace separation pyrolyzing disposition cyanide polluted soil Download PDFInfo
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- CN208349860U CN208349860U CN201820785522.0U CN201820785522U CN208349860U CN 208349860 U CN208349860 U CN 208349860U CN 201820785522 U CN201820785522 U CN 201820785522U CN 208349860 U CN208349860 U CN 208349860U
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Abstract
The utility model relates to the systems of a kind of cement kiln, furnace separation pyrolyzing disposition cyanide polluted soil, the system is equipped with choke supporting plate on the inner sidewall of conical shell body for decomposing furnace bottom, the center of choke supporting plate opens up blanking hole one, the bottom of blanking hole one is equipped with blanking tube, blanking tube protrudes into kiln tail smoke-box, and kiln tail smoke-box is equipped with Polluted Soil feeder pipe.The utility model carries out Polluted Soil disposition using the system, it realizes that the Polluted Soil containing cyanide comes into full contact with after entering kiln with the high-temperature gas in kiln to parse, exhaust gas containing cyanide enters in dore furnace, Pintsch process is carried out using secondary burning technology, disposal system is integrally in the environment of a negative pressure simultaneously, finally realize the recycling of the Polluted Soil containing cyanogen, innoxious, safe is disposed, and effectively prevents secondary pollution.
Description
Technical field
The utility model belongs to Polluted Soil processing technology field, disposes more particularly to a kind of cement kiln, furnace separation pyrolyzing
The system of cyanide polluted soil.
Background technique
Cyanide is extremely toxic substance, is entered in vivo, in internal cytochrome oxidase by respiratory tract or alimentary canal
Ferric iron combines, and cannot utilize oxygen so as to cause cell, lose the effect of transmitting oxygen, eventually lead to body hypoxia death, because
This, Polluted Soil containing cyanogen, which has to pass through scientific and reasonable disposition just and can effectively prevent to people, animal, plant and agricultural belt, endangers
Evil.
The moisture of Polluted Soil containing cyanogen is larger (> 15%), and a large amount of moisture evaporation sharply absorbs temperature in kiln in disposal process
Degree, causes smoke-box temperature that (≤300 DEG C) are greatly reduced, and smoke-box temperature is 1050 ± 50 in traditional cement rotary kiln technique
DEG C, the ignition point of coal dust normally at 600 DEG C or so, a large amount of vapor after entering dore furnace, cause coal dust in dore furnace without
Method normal combustion, afterburning is very serious, in turn results in preheater bulk temperature and increases, second level cylinder outlet temperature >=800 DEG C,
As the extension coal dust afterburning of Deal with Time can be more serious, increase hidden danger to the safe operation of pre-heating system, it can only
It is forced to take and stops kiln cooling measure.
Clay is commonly used to as the siliceous raw material and aluminum raw material in raw meal proportioning in the production of conventional cement clinker,
In silica, alchlor and other harmful substances matter (alkali, chlorine, sulphur) content it is more, cause its firing range very narrow
It is narrow.And main chemical compositions are silicon, aluminium, iron, magnesium and other alkaline matters in Polluted Soil, if simple burning Polluted Soil,
It is easy to appear necessarily occur thick ring formation, while high temperature in the cooling wind for encountering grate-cooler to liquid phase before kiln in calcination process
The material of bonding, which is trickled down, forms snowman at the fixed grate plate of grate-cooler, when serious the height of snowman be more than grate-cooler case top and
Stop kiln, these all not can guarantee the stability of disposal process.
Summary of the invention
The utility model is to solve technical problem present in well-known technique and provide a kind of cement kiln, at furnace separation pyrolyzing
The system for setting cyanide polluted soil separates independent calcining technology using kiln, furnace, realizes the Polluted Soil containing cyanide after entering kiln
It comes into full contact with and parses with the high-temperature gas in kiln, the exhaust gas containing cyanide enters in dore furnace, utilizes secondary burning technology
Carry out Pintsch process, while disposal system is integrally in the environment of a negative pressure, finally realize the Polluted Soil containing cyanogen recycling,
Innoxious, safe disposition, and effectively prevent secondary pollution.
The utility model is adopted the technical scheme that solve technical problem present in well-known technique:
The system of a kind of cement kiln, furnace separation pyrolyzing disposition cyanide polluted soil, including preheater, dore furnace, kiln tail
Smoke-box, cement kiln and grate-cooler, which is characterized in that the inner sidewall of the conical shell body for decomposing furnace bottom is equipped with choke support
Plate, the center of the choke supporting plate open up blanking hole one, and the bottom of the blanking hole one is equipped with blanking tube, and the blanking tube protrudes into
Kiln tail smoke-box, the kiln tail smoke-box are equipped with Polluted Soil feeder pipe.
The choke supporting plate and blanking tube are formed using castable refractory formed by integrally casting.
The choke supporting plate with a thickness of 300-500mm.
Several blanking holes two are also uniformly provided on the choke supporting plate around blanking hole one, the blanking hole two
Aperture is less than the aperture of blanking hole one.
The discharge port of the blanking tube is angle, and the direction of the angle is opposite with flue gas flow direction in cement kiln.
Single tube triple channel kiln tail oil coal multifuel combustion rifle is additionally provided on the dore furnace.
The technique that cement kiln, furnace separation pyrolyzing disposition cyanide polluted soil are carried out using above system, including walk as follows
It is rapid:
1) Polluted Soil enters kiln by a line cement kiln tail smoke-box after pre-processing；
2) pyrolysis desorption in cement kiln: Polluted Soil 50~75t/h for the treatment of capacity, kiln hood 2.5~5t/h of coal, diesel oil dosage 80
~300L/h, incineration temperature >=1000 DEG C in cement kiln guarantee that flame combustion is stablized；Control cement kiln speed is 1.0~3.0r/
Min, residence time >=35min of the Polluted Soil in cement kiln, parses the cyanide in cement kiln in Polluted Soil；
3) cyanide cracks in dore furnace: the cyanide gas generated in heat treatment process, into dore furnace in carry out it is high
Warm incineration disposal, kiln tail 1.0~3.0t/h of coal, diesel oil 100~450L/h of dosage decompose furnace combustion temperature control 950
~1200 DEG C, at 850~950 DEG C, residence time of the tail gas in dore furnace is greater than 3 seconds the control of decomposition furnace outlet temperature, makes cyanogen
Compound thoroughly cracks.
Environment of the system generally in a negative pressure.
The level-one negative well bore pressure of the preheater is -1000~-3000pa.
5~30t/h of investment is used to adsorb the catalyst of sulfide in the level-one cylinder of the preheater.
Compared with prior art, the utility model has the advantages and positive effects of:
1) the utility model is by being arranged choke supporting plate, ensure that in dore furnace in kiln tail smoke-box and dore furnace junction
Fuel be fully burned, under the harmful substance in Polluted Soil is thoroughly decomposed, while aperture is added on choke supporting plate
Expect hole, stablize flue gas flow field, improve the efficiency of combustion of kiln hood fuel, the reasonable shape of kiln hood flame is maintained, so that kiln temperature
Gradient distribution is more reasonable, improves the efficiency of Polluted Soil pyrolysis and cracking；
2) the utility model revolutionizes the temperature gradient distribution in cement kiln, effectively prevents occurring concentrating in kiln high
Polluted Soil melting phenomenon caused by temperature guarantees the continuous and stable operation of this disposition process system；Again, due to new dry process water
The characteristics of mud production technology, is easy to appear buildup in dore furnace, and the blanking hole and blanking tube added can guarantee in dore furnace
The smooth of material passes through, and avoids reducing the accumulation of material in dore furnace there are blanking blind area；
3) dore furnace is changed to the combustion of oil coal mixture fuel supply by the utility model by original single fuel supply mode
Burning mode, fuel combustion are more abundant, hence it is evident that reduce the consumption of the energy, the moisture largely reduced in Polluted Soil exists
Become vapor under high temperature action and enter the influence that dore furnace causes its internal temperature gradient disorder, it is ensured that dore furnace fuel
Stablize burning, system temperature in 950 to 1200 degree, thoroughly cracks and harmlessness disposing steadily in the long term to reach cyanide；
4) the utility model is by dore furnace technological innovation, realizes kiln column, furnace column technique separates, and changes conventional cement
The igniting of rotary kiln, heating mode realize kiln hood and dore furnace firing up simultaneously, had both solved and decomposed under cold conditions state
The independent burning of furnace fuel realizes the cracking to the body containing dicyanogen；Break the warming law of conventional lower cement rotary kiln again, substantially
Its heating-up time is reduced, the operational mode of original rotary kiln is finally changed；
5) it makes full use of existing facility and process structure to be laid out, reduces investment, Polluted Soil containing cyanogen is in cement kiln and kiln hood
Flame carries out counterflow heat exchange, and the pollutant in soil is thoroughly parsed, is cracked using the high temperature in kiln tail dore furnace,
HCN-containing gases secondary heating, and with the sulfide brought into Catalyst Adsorption coal dust, guarantee that environmental protection index is strictly lower than national control
Standard processed realizes recycling, the safe disposition of the Polluted Soil containing cyanogen, and pollution can be disposed on a large scale by finally realizing cement kiln
The purpose of soil；
6) by kiln, furnace isolation technics, the influence of moisture content and airflow fluctuation to dore furnace fuel completely burned is avoided, surely
The bulk temperature of pre-heating system is determined, it is ensured that cyanide there are enough residence times in system, guarantees that cyanide is thoroughly warm
Cracking.
7) gas that heat treatment process generates makes full use of this independent burning technology, thoroughly avoids parsing in kiln
The case where short circuit and then discharging directly into atmosphere occur for cyanide, cause secondary environmental pollution.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model.
In figure: 1- dore furnace, 2- kiln tail smoke-box, 3- cement kiln, 4- choke supporting plate, 41- blanking hole one, 42- blanking hole two,
5- blanking tube, 6- kiln tail oil coal multifuel combustion rifle, 7- Polluted Soil feeder pipe.
Specific embodiment
For the invention, features and effects that can further appreciate that the utility model, the following examples are hereby given, and cooperates
Detailed description are as follows for attached drawing:
Embodiment:
The system of a kind of cement kiln, furnace separation pyrolyzing disposition cyanide polluted soil, including preheater, dore furnace 1, kiln tail
The inner sidewall of smoke-box 2, cement kiln 3 and grate-cooler, the conical shell body of 1 bottom of dore furnace is equipped with choke supporting plate 4, choke supporting plate
4 center opens up blanking hole 1, and the bottom of blanking hole 1 is equipped with blanking tube 5, and blanking tube 5 protrudes into kiln tail smoke-box 2, choke support
Plate 4 and blanking tube 5 are formed using castable refractory (model G-16K) and anchoring piece (material: 1Gr18Ni9Ti) formed by integrally casting, shape
At the choke supporting plate with a thickness of 300-500mm, the inner diameter size of blanking tube is according to Polluted Soil disposition amount, kiln temperature gradient point
Cloth, the ventilation quantity in kiln, the combustion efficiency of kiln fuel are adjusted, when Polluted Soil treating capacity is 50~75t/h, blanking
The internal diameter of cylinder is controlled in 70-115cm；Dore furnace 1 is equipped with single tube triple channel kiln tail oil coal multifuel combustion rifle 6, and three channels are used respectively
In for oil supply, coal and wind, kiln tail smoke-box 2 is equipped with Polluted Soil feeder pipe 7, and Polluted Soil directly enters kiln by kiln tail smoke-box.
To avoid causing material accumulation in dore furnace there are blanking blind area, the choke supporting plate 4 around blanking hole 1
On be also uniformly provided with several blanking holes 2 42, the aperture of blanking hole 2 42 is less than the aperture of blanking hole 1.
The discharge port of blanking tube 5 be angle, and angle direction with flue gas flow direction in cement kiln on the contrary, can be to greatest extent
Ground reduces the adverse effect that flue gas turbulent flow generates dore furnace fuel combustion, plays the purpose of stable flame, guarantees second-time burning
Effect improves cyanide lysis efficiency.
The technique that cement kiln, furnace separation pyrolyzing disposition cyanide polluted soil are carried out using above system, including walk as follows
It is rapid:
1) Polluted Soil by sieving approach, closed transmission and is homogenized, feeds a series of pre-processings such as metering first
Kiln is entered by a line cement kiln tail smoke-box afterwards；
2) Polluted Soil is pyrolyzed desorption: Polluted Soil 50~75t/h for the treatment of capacity, kiln hood 2.5~5t/h of coal, bavin in cement kiln
Oily 80~300L/h of dosage, incineration temperature >=1000 DEG C in cement kiln guarantee that flame combustion is stablized；Controlling cement kiln speed is
1.0~3.0r/min, residence time >=35min of the Polluted Soil in cement kiln, make cyanide in cement kiln in Polluted Soil into
Row parsing；
3) cyanide cracking: the cyanide gas generated in heat treatment process is carried out in dore furnace, into dore furnace in into
The disposition of row high temperature incineration, kiln tail 1.0~3.0t/h of coal, diesel oil 100~450L/h of dosage decompose furnace combustion temperature control and exist
950~1200 DEG C, at 850~950 DEG C, residence time of the tail gas in dore furnace is greater than 3 seconds the control of decomposition furnace outlet temperature, makes
Cyanide thoroughly cracks；The soil of reparation is stored in the clinker storage warehouse of original process layout after grate-cooler is cooling, cooling to hand over
High-temperature gas after changing draws wind to utilize to dore furnace as combustion air through tertiary-air pipe.
When carrying out cyanide pollution soil disposing technique, system generally in a negative pressure environment, so that it is guaranteed that not sending out
The secondary pollution of raw environment is finally reached recycling, safe, the innoxious purpose for repairing qualified soil.The level-one of preheater
Negative well bore pressure is -1000~-3000pa, it is ensured that the normal operation of whole system.
5~30t/h of investment is used to adsorb the catalyst of sulfide, such as agstone in the level-one cylinder of preheater, into one
Step ensures that system tail gas meets environment protection emission requirement,.
In conclusion the utility model realizes kiln, furnace technology separation, both solved kiln, furnace and independently lighted a fire, independently calcine
Technology, and break conventional kiln warming law, the heating-up time is greatly reduced, change original mode that feeds intake, it is logical that system is greatly reduced
Moisture content (> 20%) higher Polluted Soil is efficiently avoided while air quantity again to caused by kiln tail fuel normal combustion
Drawback；This utility model revolutionizes the distribution band of the technological temperature in rotary kiln, and temperature gradient distribution effectively prevents in kiln
There is the phenomenon that high temperature concentration pollutes soil fusing, guarantees the stabilization and continuous operation of this disposition process system, realize water
Stall disposes the purpose of Polluted Soil on a large scale.
The above is only the preferred embodiment to the utility model, is not made in any form to the utility model
Limitation, it is all according to the technical essence of the utility model any simple modification made to the above embodiment, equivalent variations with
Modification, is all within the scope of the technical scheme of the utility model.
Claims (6)
1. the system that a kind of cement kiln, furnace separation pyrolyzing dispose cyanide polluted soil, including preheater, dore furnace, kiln tail cigarette
Room, cement kiln and grate-cooler, which is characterized in that the inner sidewall of the conical shell body for decomposing furnace bottom is equipped with choke support
Plate, the center of the choke supporting plate open up blanking hole one, and the bottom of the blanking hole one is equipped with blanking tube, and the blanking tube protrudes into
Kiln tail smoke-box, the kiln tail smoke-box are equipped with Polluted Soil feeder pipe.
2. the system that cement kiln according to claim 1, furnace separation pyrolyzing dispose cyanide polluted soil, feature exist
In: the choke supporting plate and blanking tube are using the molding of castable refractory formed by integrally casting.
3. the system that cement kiln according to claim 1, furnace separation pyrolyzing dispose cyanide polluted soil, feature exist
In: the choke supporting plate with a thickness of 300-500mm.
4. the system that cement kiln according to claim 1, furnace separation pyrolyzing dispose cyanide polluted soil, feature exist
In: several blanking holes two, the aperture of the blanking hole two are also uniformly provided on the choke supporting plate around blanking hole one
Less than the aperture of blanking hole one.
5. the system that cement kiln according to claim 1, furnace separation pyrolyzing dispose cyanide polluted soil, feature exist
In: the discharge port of the blanking tube is angle, and described and angle towards opposite with flue gas flow direction in cement kiln.
6. the system that cement kiln according to claim 1, furnace separation pyrolyzing dispose cyanide polluted soil, feature exist
In: single tube triple channel kiln tail oil coal multifuel combustion rifle is additionally provided on the dore furnace.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820785522.0U CN208349860U (en) | 2018-05-24 | 2018-05-24 | The system of cement kiln, furnace separation pyrolyzing disposition cyanide polluted soil |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820785522.0U CN208349860U (en) | 2018-05-24 | 2018-05-24 | The system of cement kiln, furnace separation pyrolyzing disposition cyanide polluted soil |
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| CN208349860U true CN208349860U (en) | 2019-01-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108518998A (en) * | 2018-05-24 | 2018-09-11 | 天津金隅振兴环保科技有限公司 | The system and its technique of cement kiln, stove separation pyrolyzing disposition cyanide polluted soil |
-
2018
- 2018-05-24 CN CN201820785522.0U patent/CN208349860U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108518998A (en) * | 2018-05-24 | 2018-09-11 | 天津金隅振兴环保科技有限公司 | The system and its technique of cement kiln, stove separation pyrolyzing disposition cyanide polluted soil |
| CN108518998B (en) * | 2018-05-24 | 2024-05-24 | 天津金隅振兴环保科技有限公司 | System and process for treating cyanide-polluted soil by cement kiln and furnace separation pyrolysis |
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