CN111842457B - Ectopic thermal desorption method and device for organic contaminated soil - Google Patents
Ectopic thermal desorption method and device for organic contaminated soil Download PDFInfo
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- CN111842457B CN111842457B CN202010587012.4A CN202010587012A CN111842457B CN 111842457 B CN111842457 B CN 111842457B CN 202010587012 A CN202010587012 A CN 202010587012A CN 111842457 B CN111842457 B CN 111842457B
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- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
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Abstract
The invention discloses an ectopic thermal desorption device for oil sludge or organic contaminated soil, which comprises a rotary kiln, a dust remover, an induced draft fan, a desulfurization absorption tower, a chimney and a rotary RTO combustion chamber, wherein oil-containing sludge enters from the inlet end of a drum screening machine, the outlet of the drum screening machine is connected with the feeding end of a belt conveyor, the discharge end of the belt conveyor is connected with a feeding bin of the rotary kiln, the flue gas outlet of the rotary kiln is connected with the air inlet of the dust remover, one end of the outlet of the dust remover is connected with the inlet of the rotary RTO combustion chamber, the outlet of the rotary RTO combustion chamber is connected with the inlet of the induced draft fan, the outlet of the induced draft fan is connected with the inlet end of the desulfurization absorption tower, and the chimney is communicated with the upper end of the desulfurization absorption tower. The invention has no secondary pollution in tail gas emission, realizes the denitration effect by replacing a secondary combustion chamber with rotary RTO, and has high heat utilization efficiency and high thermal desorption efficiency.
Description
Technical Field
The invention belongs to the field of soil ex-situ thermal desorption, and particularly relates to a thermal ex-situ thermal desorption method and device for organic contaminated soil. The method is mainly used for thermal desorption remediation of volatile and semi-volatile organic pollutant contaminated soil in industries such as petroleum and the like.
Background
A large amount of oily sludge containing Volatile Organic Compounds (VOCs) or semi-volatile organic compounds (SVOCs) is generated in a series of production chains of petroleum development, refining process, transportation, use, storage, oily sewage treatment and the like, the oily sludge can pollute the soil of the surrounding environment when stacked or buried, secondary pollution is caused to surface water and underground water, and generated toxic substances can be absorbed and enriched by animals and plants and transferred by food chains, so that the human health is directly or indirectly harmed.
At present, the harmless treatment of the oil sludge has no unified national standard, and the oil content of the sludge after the harmless treatment of the oil sludge is required to be less than 2 percent according to the standards of regions such as Daqing, Xinjiang, Shaanxi and the like. The harmless treatment method of the oil sludge generally comprises an incineration method, a biological method, a thermal desorption method, a thermal cracking method, a thermal washing method, resource utilization (cement kiln cooperation, composting) and the like, and the resource utilization capability is small due to the influences of different oil sludge sources, difference of physical and chemical properties of crude oil, difference of lithology in the oil sludge, geographical position and the like; the incineration method and the thermal cracking method have the problems that the generated tail gas is easy to generate secondary pollution and the tail gas is difficult to treat; the biological method is influenced by the climate environment and the like, the concentration of petroleum hydrocarbon which can be treated is too low, the treatment period is long, the efficiency is low, and the comprehensive popularization is difficult; thermal desorption is a relatively mature high-temperature physical treatment method and is one of widely applied processes, and the principle of the thermal desorption treatment technology is direct or indirect heat exchange heating, so that organic volatile matters and semi-volatile matters in the oil sludge reach a high enough temperature (above the boiling point of pollutants) and the pollutants are separated from the soil. The pollutants are removed by the treatment means of high-temperature oxidation, tail gas adsorption and the like again, so that the purpose of treating the pollutants is achieved.
The invention with publication number of CN 107639110A discloses a device for repairing contaminated soil, the thermal desorption technical process flow of the device is mainly that the contaminated soil enters a drying kiln and a rotary kiln through a screw feeder, large particle dust is removed through cyclone dust removal, the contaminated soil is further oxidized and combusted in a secondary chamber, the exhausted smoke enters a waste heat boiler to recover waste heat, and then the pollutants are further removed through a semi-dry reaction tower, activated carbon absorption and cloth bag dust removal. In the thermal desorption processing procedure, because the soil of simultaneous processing is more, soil moisture content is big, leads to the feeding screw to block up, and the clearance between the soil is less, and the efficiency of heat transfer is lower for holistic thermal desorption efficiency is lower, and the soil adhesion can not obtain the stirring on the rotary kiln flight, makes first half section soil of rotary kiln bond easily into cubic and gathers, is unfavorable for subsequent restoration processing. Meanwhile, the amount of the flue gas dust after desorption is large, the combustion effect of the second combustion chamber is influenced, the outlet temperature of the second combustion chamber is high, and the problem of limited heat recovery rate exists. The gas generated by oxidation combustion in the secondary combustion chamber needs further denitration treatment subsequently, and secondary pollution is possibly caused in the tail gas treatment process.
Therefore, it is very necessary to create an efficient, energy-saving and environment-friendly ex-situ thermal desorption treatment method for organic matter contaminated soil.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art and provides a method and a device for heterotopic thermal desorption of organic contaminated soil, which are used for realizing high-efficiency, energy-saving, environment-friendly and harmless treatment of oily sludge, organic contaminated soil and the like.
In order to solve the technical problems, the invention adopts the following technical scheme:
the organic contaminated soil ex-situ thermal desorption device comprises a rotary kiln, a dust remover, an induced draft fan, a desulfurization absorption tower and a chimney, wherein the rotary kiln comprises a barrel, one end of the barrel is respectively provided with a feeding bin and a flue gas outlet, the other end of the barrel is provided with a first burner and a silt outlet, and a shoveling plate is fixed on the inner wall of the barrel;
the flue gas export with the dust remover air inlet intercommunication, the dust remover export with the import intercommunication, first export with draught fan entry intercommunication, the draught fan export with desulfurization absorption tower entrance point intercommunication, the chimney with desulfurization absorption tower upper end intercommunication.
The invention adopts a rotary RTO combustion chamber, and adds an SNCR spray gun and a denitration catalyst layer on the basis of the existing rotary RTO combustion chamber, and ammonia and NOx in smoke gas are generated in an RTO hearth (800-950 ℃), whereinNon-catalytic reduction reaction to produce N2And H2O, the removal efficiency is about 40%; unreacted ammonia enters the denitration catalyst layer (200-450 ℃) to perform catalytic reduction reaction, NOx in the flue gas is further removed, and the total removal rate of the NOx can reach 90%. The rotary RTO combustion chamber can realize denitration effect, and the investment of SCR equipment is reduced. The heat energy generated by the burner in the rotary RTO combustion chamber can ensure that the organic pollutants in the flue gas are completely oxidized and combusted under sufficient air and decomposed into CO2、H2O、SO2NOx, and the like. The heat accumulation body in the rotatory RTO combustion chamber can effectively reduce the flue gas heat loss, reduces the consumption of natural gas, utilizes the aqueous ammonia of SNCR spray gun blowout and the NOx that the burning formed to take place to react in rotatory RTO combustion chamber, and the low temperature denitration catalyst layer of rethread can effectively get rid of nitrogen oxide.
And an outlet of the rotary RTO combustion chamber is communicated with an induced draft fan, so that the flow of gas in the system can be promoted.
The flue gas discharge port sets up in the feed end of rotary kiln, and the flue gas flow direction in the kiln forms the adverse current with the material flow direction, and abundant heat transfer promotes thermal desorption effect.
Preferably, the dust remover is a metal film dust remover. A large amount of dust-containing flue gas generated after thermal desorption treatment in the rotary kiln enters a metal film dust remover through a rotary kiln outlet flue, and dust is removed under the filtering action of a YT flexible film. The filtering wind speed of the metal film dust collector is set to be 1.1 m/min, the pressure of the pulse valve is set to be 0.2-0.3 MPa, and the gas consumption is 9 Nm3Min (0.8 MPa), the resistance of the dust remover is less than 1200Pa, the temperature difference is less than 20 ℃, and the dust removal efficiency is more than 99.9 percent.
Preferably, a second outlet is formed in the rotary RTO combustion chamber, and the second outlet is communicated with the air inlet of the dust remover. Partial high-temperature smoke in the rotary RTO combustion chamber is guided back to the metal film dust collector, so that organic pollutants in the metal film dust collector are prevented from being liquefied again and adhered to the surface of the metal film due to temperature reduction, a filter bag is prevented from being blocked, and the performance of the metal film dust collector is prevented from being influenced.
Preferably, the rotary kiln further comprises a gravity ring, the gravity ring is movably sleeved outside the shoveling plate, one end of the shoveling plate is fixed on the inner wall of the cylinder, and the other end of the shoveling plate is a bent part or a protruding part. When the shoveling plate rotates to the top along with the kiln, the gravity ring can fall down due to the action of gravity, the oil sludge adhered to the shoveling plate can be cleaned in the process, and the oil sludge is prevented from being accumulated in the kiln.
Preferably, soil dystopy thermal desorption device still includes drum screening machine, band conveyer, drum screening machine export meets with band conveyer material loading end, band conveyer discharge end with the feeding storehouse meets, the last belt weigher that is provided with of band conveyer.
Preferably, the rotary kiln further comprises a feeding baffle plate, and the feeding baffle plate is rotatably arranged at the bottom of the feeding bin. The kiln head is in micro negative pressure, and the pressure is controlled to be about-10 Pa.
Preferably, the soil ex-situ thermal desorption device further comprises a screw conveyor and a flat plate conveyor, wherein an inlet of the screw conveyor is connected with the sediment outlet, and an outlet of the screw conveyor is connected with an inlet of the flat plate conveyor. Spraying equipment can be arranged around the outlet screw conveyor and the flat plate type steel plate conveyor for cooling and dedusting.
Preferably, a plurality of shoveling plates are arranged in the rotary kiln, and a gravity ring is arranged on the shoveling plate close to 2/3 in front of the feeding bin, so that soil stirring in the kiln is promoted, high water content of soil in the front section of the kiln is avoided, and oil sludge is adhered to the shoveling plates to block the oil sludge from moving from the head of the kiln to the tail of the kiln.
Furthermore, the rotary kiln power system preferably comprises a variable frequency motor, a speed reducer, a coupling and a gear shaft. The variable frequency motor is decelerated by a speed reducer, and the variable frequency motor is connected with a gear set through power output by a coupler to drive the kiln to rotate.
Further, the rotary kiln is a direct thermal desorption kiln.
Further, the burner fuel of the rotary kiln and the rotary RTO combustion chamber is preferably natural gas. Furthermore, the temperature in the rotary kiln is 300-400 ℃, the retention time is 20-30 min, and the temperature of the rotary RTO combustion chamber is 850-950 ℃.
Further, the denitration catalyst layer is located 1/2-3/4 of the rotary RTO combustion chamber in height, the temperature range is 200-420 ℃, and the total denitration efficiency is more than 85%.
Further, the outlet temperature of the rotary RTO combustion chamber is 80-120 ℃.
Further, the desulfurizing tower is used for wet desulfurization, and the desulfurizing efficiency is more than 99%.
Further, the whole process system and equipment should also include gas supply, water supply, fuel supply, chemical addition, etc.
Furthermore, a kiln head flue gas baffle is further arranged in the rotary kiln, and the kiln head flue gas baffle is located between the feeding bin and the flue gas outlet.
Further, the heat accumulator is a ceramic heat accumulator.
Further, the denitration catalyst in the denitration catalyst layer is a modified vanadium-titanium low-temperature catalyst, and the optimal reaction temperature is 200-450 ℃.
The invention also discloses an ectopic thermal desorption method for the organic contaminated soil, which is carried out by utilizing the ectopic thermal desorption device for the soil and comprises the following steps:
thermal desorption treatment: the organic contaminated soil enters a rotary kiln for thermal desorption treatment to obtain smoke and clean silt;
high-temperature dust removal treatment: the flue gas enters a dust remover to obtain dust removing gas;
complete combustion and denitration treatment: the method comprises the following steps that (1) dedusting gas enters a rotary RTO combustion chamber, the temperature of flue gas in the rotary RTO combustion chamber is larger than 850 ℃, the residence time of the flue gas is 1-3 s, the dedusting gas is thoroughly oxidized and combusted to obtain oxidizing gas, and the oxidizing gas and ammonia water sprayed by an SNCR spray gun are completely combusted and denitrated in the rotary RTO combustion chamber under the action of a denitration catalyst layer to obtain denitrated flue gas;
desulfurization and deacidification treatment: and (4) enabling the denitrated flue gas to enter a desulfurization tower to obtain purified flue gas, and finally discharging the purified flue gas into the atmosphere through a chimney.
The rotary kiln forms micro negative pressure under the action of the draught fan, so that organic pollutants in the oil sludge are desorbed under the negative pressure condition, and the escape of the pollutants is avoided. In the process, the oil sludge in the rotary kiln is in countercurrent contact with high-temperature flue gas generated by the burner, so that the thermal desorption effect is improved. Denitration is carried out while rotatory RTO combustion chamber oxidation burning.
Preferably, the thermal desorption treatment further comprises the following steps:
pretreating oil sludge: feeding the organic contaminated soil into a drum screening machine for screening to obtain oil-containing contaminated particles with the average particle size of 30-40 mm;
quantitative conveying: the oily pollution particles are conveyed into the rotary kiln through a belt conveyor, a belt scale is arranged on the belt conveyor, and the subsequent treatment capacity entering the rotary kiln is controlled by adjusting the conveying speed.
Preferably, the oil sludge adhered to the shoveling plates is cleaned through the action of the gravity ring in the thermal desorption process of the rotary kiln, so that the oil sludge is prevented from being accumulated in the kiln.
Preferably, the concentration of the ammonia water is 15-25%.
The invention has the advantages and characteristics that:
(1) the rotary RTO is used for replacing a secondary combustion chamber, the heat utilization efficiency is improved, the RTO combustor only needs to maintain small fire, and compared with the existing device, the device greatly saves fuel consumption and saves investment of a waste heat recovery device.
(2) The denitration catalyst layer is arranged in the RTO heat storage chamber, so that the investment of SCR equipment is reduced, the NOx removal efficiency is improved, and the comprehensive NOx removal efficiency can reach 90%.
(3) The tail gas treatment can reach the ultralow emission standard, has no secondary pollution, and is particularly suitable for the soil remediation of volatile organic compounds such as oil sludge or semi-volatile organic compounds.
(4) Screening in a roller screening machine, carrying out quantitative conveying by a belt conveyor, and additionally arranging a gravity ring on a shoveling plate in the rotary kiln, so that oil sludge or soil is not easy to adhere to the shoveling plate, the oil sludge is fully stirred, and the subsequent repairing treatment is facilitated.
Drawings
Fig. 1 is a schematic structural diagram of an ectopic thermal desorption device for organic contaminated soil according to the present invention;
FIG. 2 is an enlarged schematic view of the dip plate portion of FIG. 1;
FIG. 3 is an enlarged schematic view of the portion of the feed block of FIG. 1;
the reference numbers in the figures illustrate:
a drum screening machine 1; a belt conveyor 2; a rotary kiln 3; a feed bin 31; a feed baffle 32; a kiln head flue gas baffle 33; a shovelling plate 34; a gravity ring 35; a first burner 36; a rotary kiln flue gas outlet 37; a cylinder 38; a dust remover 4; a YT membrane metal filter bag 41; a rotating RTO combustion chamber 5; the first heat storage body 51; an SNCR lance 52; the second burner 53; a denitration catalyst layer 54; a second heat storage body 55; a housing 56; an inlet 57; a first outlet 58; a second outlet 59; an induced draft fan 6; a desulfurization absorption tower 7; a chimney 8; a screw conveyor 9; a flat conveyor 10.
Detailed Description
The following detailed description of the embodiments of the present invention will be provided in order to better understand the present invention with reference to the accompanying drawings, but the scope of the present invention is not limited to the following embodiments.
As shown in fig. 1, the invention provides an ex-situ thermal desorption device for organic contaminated soil, which comprises: the device comprises a roller screening machine 1, a belt conveyor 2, a rotary kiln 3, a dust remover 4, a rotary RTO combustion chamber 5, an induced draft fan 6, a desulfurization absorption tower 7, a chimney 8, a screw conveyor 9 and a flat plate conveyor 10.
The rotary kiln 3 comprises a feeding bin 31, a feeding baffle 32, a kiln head flue gas baffle 33, a shoveling plate 34, a gravity ring 35, a first combustor 36, a flue gas outlet 37, a cylinder 38 and a sediment outlet 39. The feed bin 31 opens onto the barrel 38. As shown in fig. 3, the feeding baffle 32 is rotatably arranged at the bottom of the feeding bin 31, when the feeding is not carried out, the feeding baffle 32 covers the bottom of the feeding bin 31, when the feeding is carried out, the feeding baffle 32 rotates 90 degrees, so that the oil sludge enters the rotary kiln 3, and then the feeding baffle 32 covers the bottom of the feeding bin 31 again. The kiln head flue gas baffle 33 is positioned between the feed bin and the flue gas outlet to allow the flue gas to be discharged from the flue gas outlet 37. As shown in fig. 2, the gravity ring 35 is movably sleeved outside the shoveling plate 34, one end of the shoveling plate 34 is fixed on the inner wall of the cylinder 38, and the other end of the shoveling plate 34 is a bent part, so that the gravity ring 35 can move on the vertical part of the shoveling plate 34 along with the rotation of the cylinder 38, and oil sludge is prevented from being adhered to the shoveling plate 34. A plurality of shoveling plates are arranged in the cylinder body 38, and a gravity ring 35 is arranged on the shoveling plate close to 2/3 in front of the feeding bin 31 to promote soil stirring in the kiln, so that high water content of soil in the front section of the kiln is avoided, and oil sludge is adhered to the shoveling plates to block the oil sludge from moving from the head of the kiln to the tail of the kiln. The flue gas outlet 37 is arranged at a side close to the feed bin 31. First combustor 36 sets up in barrel 38 one end, and gas outlet 37 and silt export 39 are all seted up on barrel 38, and silt export 39 is located first combustor 36 below. The inlet of the screw conveyor 9 is connected with the silt outlet 39, and the outlet of the screw conveyor 9 is connected with the inlet of the flat plate conveyor 10. Spraying equipment is arranged around the outlet screw conveyor 9 and the plate conveyor 10 for cooling and dedusting.
The dust remover 4 adopts a metal film dust remover, and a YT film metal filter bag 41 is arranged in the metal film dust remover.
The rotary RTO combustor 5 includes a first thermal mass 51, an SNCR spray gun 52, a second burner 53, a denitration catalyst layer 54, a second thermal mass 55, a casing 56, an inlet 57, a first outlet 58, and a second outlet 59. The SNCR spray gun 52 is arranged at the top of the shell 55 in a penetrating way, the second combustor 53, the first heat accumulator 51, the denitration catalyst layer 54 and the second heat accumulator 55 are arranged in the shell 56 from top to bottom in sequence, and the inlet 57 and the first outlet 58 are respectively arranged at the lower part of the shell 56; the second outlet 59 communicates with the air inlet of the dust separator 4.
Oily sludge enters from the inlet end of a drum screening machine 1, the outlet of the drum screening machine 1 is connected with the feeding end of a belt conveyor 2, the discharging end of the belt conveyor 2 is connected with a feeding bin 31 of a rotary kiln 3, the flue gas outlet of the rotary kiln 3 is connected with the gas inlet of a dust remover 4, one end of the outlet of the dust remover 4 is connected with the inlet of a rotary RTO combustion chamber 5, the outlet of the rotary RTO combustion chamber 5 is connected with the inlet of a draught fan 6, the outlet of the draught fan 6 is connected with the inlet end of a desulfurization absorption tower 7, and tail gas is treated to reach the standard and then is discharged into the atmosphere through a chimney 8.
The ex-situ thermal desorption method of the device specifically comprises the following steps:
(1) pretreating oil sludge: feeding the organic contaminated soil into a drum screening machine for screening, and removing metal, tar blocks and the like to obtain oil-containing contaminated particles with the average particle size of 30-40 mm;
(2) quantitative conveying: the oily pollution particles are conveyed into the rotary kiln through a belt conveyor, a belt scale is arranged on the belt conveyor, and the subsequent treatment capacity entering the rotary kiln is controlled by adjusting the conveying speed.
(3) Thermal desorption treatment: oily pollution particles enter a rotary kiln through a feeding baffle plate to be subjected to thermal desorption treatment, the temperature in the rotary kiln is set to be 300-400 ℃, the residence time is 20-30 min, a shoveling plate is arranged in the rotary kiln, a gravity ring is arranged on the shoveling plate, when the shoveling plate rotates to the top along with the kiln, the gravity ring falls downwards under the action of gravity, oil sludge adhered to the shoveling plate can be cleaned in the process, and the oil sludge is prevented from being accumulated in the kiln. The rotary kiln forms micro negative pressure under the action of the draught fan, so that organic pollutants in the oil sludge are desorbed under the negative pressure condition, and the escape of the pollutants is avoided. In the process, the oil sludge in the rotary kiln is in countercurrent contact with high-temperature flue gas generated by the burner, so that organic matters in the polluted soil are vaporized and desorbed to enter the flue gas, clean silt is left, the clean silt is conveyed to a stacking place by the outlet screw conveyor and the flat plate type steel plate conveyor, and spraying equipment is arranged around the outlet screw conveyor and the flat plate type steel plate conveyor to cool and remove dust.
(4) High-temperature dust removal treatment: a large amount of dust-containing flue gas generated after thermal desorption treatment in the rotary kiln enters a metal film dust remover through a rotary kiln outlet flue, and dust is removed under the filtering action of a YT flexible film. The filtering wind speed of the metal film dust collector is set to be 1.1 m/min, the pressure of the pulse valve is set to be 0.2-0.3 MPa, and the gas consumption is 9 Nm3Min (0.8 MPa), and the resistance of the dust remover is less than 1200 Pa.
(5) Complete combustion and denitration treatment: the flue gas after high-temperature dust removal enters a rotary RTO combustion chamber, the temperature of the flue gas reaches above 850 ℃ due to heat energy generated by a burner in the rotary RTO combustion chamber, the residence time of the flue gas is 1-3 s, and organic pollutants in the flue gas are thoroughly oxidized and combusted and decomposed into CO2、H2O、SO2、NOxAnd the like. The heat accumulation body in the rotary RTO combustion chamber can effectively reduce the heat loss of the flue gas and the consumption of natural gas, and the heat accumulation body rotatesAmmonia water sprayed by SNCR spray gun and NO formed by combustion in RTO combustion chamberxThe reaction is carried out, and NOx is further removed through the modified vanadium-titanium system low-temperature denitration catalyst layer, and the total removal rate of the nitrogen oxides can reach 90%. Partial high-temperature smoke in the rotary RTO combustion chamber is guided back to the metal film dust collector, so that organic pollutants in the metal film dust collector are prevented from being liquefied again and adhered to the surface of the metal film due to temperature reduction, a filter bag is prevented from being blocked, and the performance of the metal film dust collector is prevented from being influenced.
(6) Desulfurization and deacidification treatment: the flue gas from the rotary RTO combustion chamber enters a desulfurizing tower to remove SO2And (5) waiting for acid gas, and finally discharging the purified flue gas into the atmosphere through a chimney.
The thermal desorption efficiency of the rotary kiln can reach 95 percent, the rotary kiln stably operates, and the problems of feeding of soil or oil sludge and bonding and blocking of the kiln wall are effectively solved. The burning efficiency of organic matters in the rotary RTO combustion chamber is up to 98%, the removal rate of nitrogen oxides in flue gas is up to 90%, the heat recovery efficiency of heat storage ceramics is up to 90%, and the NOx and SO in flue gas are2The particulate matter emission can reach 50, 35 and 5mg/Nm3The organic matter content of the purified soil or oil sludge is less than 3 per mill under the ultra-low emission standard.
Claims (7)
1. The utility model provides an organic contaminated soil dystopy thermal desorption device, includes rotary kiln (3), dust remover (4), draught fan (6), desulfurization absorption tower (7) and chimney (8), rotary kiln (3) are including barrel (38), barrel (38) one end is equipped with feed bin (31) and exhanst gas outlet (37) respectively, barrel (38) other end is equipped with first combustor (36) and silt export (39), be fixed with shoveling plate (34) on barrel (38) inner wall, a serial communication port, soil dystopy thermal desorption device is still including rotatory RTO combustion chamber (5), rotatory RTO combustion chamber (5) are including casing (56), casing (56) lower part is equipped with import (57) and first export (58) respectively, casing (56) top is run through and is provided with SNCR (52), be provided with second combustor (53) down in proper order in casing (56) from last, A first heat storage body (51), a denitration catalyst layer (54), and a second heat storage body (55);
the flue gas outlet (37) is communicated with a gas inlet of the dust remover (4), an outlet of the dust remover (4) is communicated with the inlet (57), the first outlet (58) is communicated with an inlet of the induced draft fan (6), an outlet of the induced draft fan (6) is communicated with an inlet end of the desulfurization absorption tower (7), and the chimney (8) is communicated with the upper end of the desulfurization absorption tower (7);
the dust remover (4) is a metal film dust remover, and the dust removal efficiency of the metal film dust remover is more than 99.9%;
and a second outlet (59) is formed in the rotary RTO combustion chamber (5), and the second outlet (59) is communicated with an air inlet of the dust remover (4).
2. An ectopic soil thermal desorption device according to claim 1, wherein the rotary kiln (3) further comprises a gravity ring (35), the gravity ring (35) is movably sleeved outside the shoveling plate (34), one end of the shoveling plate (34) is fixed on the inner wall of the cylinder (38), and the other end of the shoveling plate (34) is a bent part or a convex part.
3. An ex-situ soil thermal desorption device according to claim 2, further comprising a roller screening machine (1) and a belt conveyor (2), wherein an outlet of the roller screening machine (1) is connected with a feeding end of the belt conveyor (2), a discharging end of the belt conveyor (2) is connected with the feeding bin (31), and a belt scale is arranged on the belt conveyor (2).
4. An ex-situ soil thermal desorption device according to claim 2, wherein the rotary kiln (3) further comprises a feeding baffle (32), and the feeding baffle (32) is rotatably arranged at the bottom of the feeding bin (31).
5. An ex situ soil thermal desorption device according to claim 2, wherein the ex situ soil thermal desorption device further comprises a screw conveyor (9) and a flat plate conveyor (10), wherein the inlet of the screw conveyor (9) is connected with the silt outlet (39), and the outlet of the screw conveyor (9) is connected with the inlet of the flat plate conveyor (10).
6. An ex-situ thermal desorption method for organic contaminated soil, which is carried out by using the ex-situ thermal desorption device for soil as claimed in any one of claims 1 to 5, and comprises the following steps:
thermal desorption treatment: the organic contaminated soil enters a rotary kiln for thermal desorption treatment to obtain smoke and clean silt;
high-temperature dust removal treatment: the flue gas enters a dust remover to obtain dust removing gas;
complete combustion and denitration treatment: the method comprises the following steps that (1) dedusting gas enters a rotary RTO combustion chamber, the temperature of flue gas in the rotary RTO combustion chamber is larger than 850 ℃, the residence time of the flue gas is 1-3 s, the dedusting gas is thoroughly oxidized and combusted to obtain oxidizing gas, and the oxidizing gas and ammonia water sprayed by an SNCR spray gun are completely combusted and denitrated in the rotary RTO combustion chamber under the action of a denitration catalyst layer to obtain denitrated flue gas;
desulfurization and deacidification treatment: and (4) enabling the denitrated flue gas to enter a desulfurization tower to obtain purified flue gas, and finally discharging the purified flue gas into the atmosphere through a chimney.
7. An ex situ soil thermal desorption process according to claim 6 further including the steps of, prior to the thermal desorption process:
pretreating oil sludge: feeding the organic contaminated soil into a drum screening machine for screening to obtain oil-containing contaminated particles with the average particle size of 30-40 mm;
quantitative conveying: the oily pollution particles are conveyed into the rotary kiln through a belt conveyor, a belt scale is arranged on the belt conveyor, and the subsequent treatment capacity entering the rotary kiln is controlled by adjusting the conveying speed.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003207270A (en) * | 2002-01-11 | 2003-07-25 | Nippon Hodo Co Ltd | Treatment device of oil contaminated soil |
| CN2867237Y (en) * | 2005-12-12 | 2007-02-07 | 上海化工研究院 | Movable drum grabing plate structure |
| CN201503203U (en) * | 2009-10-16 | 2010-06-09 | 中国铝业股份有限公司 | Rotary kiln spreading board provided with automatic scar-removing device |
| CN203501187U (en) * | 2013-08-07 | 2014-03-26 | 上海同济华康环境科技有限公司 | Device for treating waste gas with high-concentration organic pollutants |
| CN103769412A (en) * | 2014-02-28 | 2014-05-07 | 天津市环境保护科学研究院 | Organic polluted soil thermal desorption system capable of not generating secondary pollution to environment |
| CN204058359U (en) * | 2014-08-07 | 2014-12-31 | 神华集团有限责任公司 | pyrolytic reaction device |
| CN107971330A (en) * | 2017-11-23 | 2018-05-01 | 北京建工环境修复股份有限公司 | The organic polluted soil dystopy thermal desorption repair system and method that waste heat efficiently utilizes |
| CN108057343A (en) * | 2016-11-07 | 2018-05-22 | 浙江奇彩环境科技股份有限公司 | A kind of heat accumulating type selective reduction denitration device and denitrating technique |
| CN110479748A (en) * | 2019-07-29 | 2019-11-22 | 上海同济华康环境科技有限公司 | A kind of contaminated soil thermal desorption repair system and its method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106540503A (en) * | 2017-02-06 | 2017-03-29 | 大连冰山空调设备有限公司 | Multi-functional waste gas pre-processing device |
-
2020
- 2020-06-24 CN CN202010587012.4A patent/CN111842457B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003207270A (en) * | 2002-01-11 | 2003-07-25 | Nippon Hodo Co Ltd | Treatment device of oil contaminated soil |
| CN2867237Y (en) * | 2005-12-12 | 2007-02-07 | 上海化工研究院 | Movable drum grabing plate structure |
| CN201503203U (en) * | 2009-10-16 | 2010-06-09 | 中国铝业股份有限公司 | Rotary kiln spreading board provided with automatic scar-removing device |
| CN203501187U (en) * | 2013-08-07 | 2014-03-26 | 上海同济华康环境科技有限公司 | Device for treating waste gas with high-concentration organic pollutants |
| CN103769412A (en) * | 2014-02-28 | 2014-05-07 | 天津市环境保护科学研究院 | Organic polluted soil thermal desorption system capable of not generating secondary pollution to environment |
| CN204058359U (en) * | 2014-08-07 | 2014-12-31 | 神华集团有限责任公司 | pyrolytic reaction device |
| CN108057343A (en) * | 2016-11-07 | 2018-05-22 | 浙江奇彩环境科技股份有限公司 | A kind of heat accumulating type selective reduction denitration device and denitrating technique |
| CN107971330A (en) * | 2017-11-23 | 2018-05-01 | 北京建工环境修复股份有限公司 | The organic polluted soil dystopy thermal desorption repair system and method that waste heat efficiently utilizes |
| CN110479748A (en) * | 2019-07-29 | 2019-11-22 | 上海同济华康环境科技有限公司 | A kind of contaminated soil thermal desorption repair system and its method |
Non-Patent Citations (2)
| Title |
|---|
| 燃烧法用于VOCs末端治理的研究进展;吴桐 等;《山东化工》;20200229;第49卷(第4期);80-81,84 * |
| 脱硝技术的现状及展望;苗强;《洁净煤技术》;20170331;第23卷(第2期);12-19 * |
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