CN211726938U - Soil ex-situ remediation thermal desorption device - Google Patents
Soil ex-situ remediation thermal desorption device Download PDFInfo
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- CN211726938U CN211726938U CN202020143566.0U CN202020143566U CN211726938U CN 211726938 U CN211726938 U CN 211726938U CN 202020143566 U CN202020143566 U CN 202020143566U CN 211726938 U CN211726938 U CN 211726938U
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- 239000002689 soil Substances 0.000 title claims abstract description 65
- 238000003795 desorption Methods 0.000 title claims abstract description 57
- 238000005067 remediation Methods 0.000 title claims description 29
- 238000011066 ex-situ storage Methods 0.000 title claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 99
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 8
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- 238000001179 sorption measurement Methods 0.000 claims description 6
- 239000000779 smoke Substances 0.000 claims description 5
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
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- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model discloses a soil dystopy is restoreed thermal desorption device. The device comprises an external heating double-position spiral drying and roasting kiln, a waste gas treatment system and a waste water treatment system; the roasting kiln comprises an upper furnace body and a lower furnace body which are communicated; two furnace tubes are respectively arranged in the upper furnace body and the lower furnace body; the feeding bin is connected with the feeding port of the upper furnace pipe through a rotary vane type feeder; the rotary vane feeder is connected with a driving motor with a frequency converter; a spiral conveying auger connected with a spiral transmission speed reducer with a frequency converter is arranged in the upper furnace tube and the lower furnace tube; the working frequency of the rotary vane feeder is consistent with the conveying frequency of the spiral conveying auger, so that the consistency of the front and rear feeding speeds is ensured; the upper furnace tube is communicated with the right side of the lower furnace tube up and down; a discharge conveyor is arranged at a discharge port at the bottom of the lower furnace pipe; the water vapor waste gas outlet at the top of the upper furnace pipe is connected with a water spraying humidifier of the waste gas treatment system; a burner is arranged on a gas pipe at the bottom of the furnace body, and a fan is arranged on an air inlet pipe. The device occupies less land, has low requirement on the field, high thermal desorption efficiency, low equipment failure rate and low energy consumption.
Description
Technical Field
The utility model belongs to the technical field of soil repair equipment, a soil remediation device is related to, in particular to thermal desorption device is restoreed to soil dystopy.
Background
The thermal desorption technology is an important means in the contaminated soil remediation technology, the thermal desorption technology is a process of heating contaminated soil to be above the boiling point of a target pollutant to volatilize or separate the target organic pollutant from the soil, the target pollutant has the effects of evaporation, distillation, boiling, oxidation, pyrolysis and the like in the thermal desorption process, different pollutants can be selectively removed by controlling the temperature of a system and the retention time of materials, the pollutant in the contaminated soil is separated from the soil under the negative pressure condition, and finally the pollutant enters a gas treatment system to be thoroughly eliminated or concentrated and collected.
The thermal desorption technology is an important means in the contaminated soil remediation technology, the thermal desorption technology is a process of heating contaminated soil to be above the boiling point of a target pollutant to volatilize or separate the target organic pollutant from the soil, the target pollutant has the effects of evaporation, distillation, boiling, oxidation, pyrolysis and the like in the thermal desorption process, different pollutants can be selectively removed by controlling the temperature of a system and the retention time of materials, the pollutant in the contaminated soil is separated from the soil under the negative pressure condition, and finally the pollutant enters a gas treatment system to be thoroughly eliminated or concentrated and collected.
Thermal desorption techniques can be divided into two major categories, namely in-situ thermal desorption techniques and ex-situ thermal desorption techniques. The in-situ thermal desorption technology is mainly used for treating some remediation areas with low requirements on remediation sites or difficult transportation of polluted soil, such as soil pollution at the original site of a suburb chemical plant and deep pollution remediation below a building. The ex-situ thermal desorption technology is used for treating areas which are not suitable for in-situ remediation, and the polluted soil is extracted and treated by a special thermal desorption system device. As a physical remediation method, the thermal desorption technology has the advantages of wide pollutant treatment range, high treatment rate, movable equipment, reutilization of the repaired soil and the like, and is widely applied to the remediation of polluted sites such as soil, sludge, sediment, filter residue and the like for treating volatile and semi-volatile organic pollutants. In addition, the thermal desorption technology is a good alternative for the emergency repair of sudden organic pollution environmental accidents, such as sudden soil pollution accidents caused by accidental leakage and dumping.
Current thermal desorption device is restoreed to soil dystopy generally adopts rotary furnace or other thermal desorption equipment as soil restoration thermal desorption firing equipment, makes organic pollutant volatilize and separates out through direct heating to polluting soil, then handles the organic pollutant who separates out. In the operation process of a rotary furnace or other thermal desorption equipment, the equipment has the advantages of high failure rate, high energy consumption, inconvenient use, low thermal desorption efficiency, high operation time, relatively complex operation and maintenance, relatively high investment cost of the equipment, secondary pollution possibly existing in the operation process, large volume of the existing equipment, high requirement on sites, pre-screening and crushing of soil, and high thermal desorption cost.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's is not enough, provides one kind and takes up an area of fewly, requires lowly to the place, and thermal desorption is efficient, and equipment fault rate is low, and the energy consumption is low, convenient to use's soil dystopy restoration thermal desorption device.
The utility model aims at realizing through the following technical scheme:
a soil ex-situ remediation thermal desorption device comprises an external heat double-position spiral type drying and roasting kiln and a waste gas treatment system connected with the external heat double-position spiral type drying and roasting kiln; the external heating double-position spiral drying and roasting kiln comprises a heating furnace body; the heating furnace body is formed by connecting, assembling and combining an upper layer furnace body and a lower layer furnace body through bolts, wherein the top of the lower layer furnace body is communicated with the bottom of the upper layer furnace body; two upper furnace tubes are arranged in the upper layer furnace body, and two lower furnace tubes are arranged in the lower layer furnace body; a feed inlet is arranged at the top of the left side of the upper furnace tube, and a rotary vane feeder is arranged at the top of the feed inlet; a feeding bin is arranged above the feeding ports of the two upper furnace tubes, the feeding bin is a feeding duplex hopper bin, and the feeding ports of the two upper furnace tubes are respectively connected with an outlet at the bottom of the feeding bin through a rotary vane type feeder; the inlet of the feeding bin is connected with the tail end of the scraper conveyor, and the front end of the scraper conveyor is connected with the weighing belt; a vibrating screen is arranged above the weighing belt; the rotary vane feeder is connected with a driving motor with a frequency converter; the upper furnace tube and the lower furnace tube are internally provided with spiral conveying augers which are connected with a spiral transmission speed reducer with a frequency converter; the working frequency of the rotary vane feeder is consistent with the spiral conveying frequency of the spiral conveying auger in the upper furnace tube and the lower furnace tube (namely the rotating speed of a driving motor of the rotary vane feeder is the same as the rotating speed of a spiral transmission speed reducer of the spiral conveying auger), and the consistency of the front feeding speed and the rear feeding speed is ensured; an upper communicating pipe and a lower communicating pipe are arranged between the right side of the upper furnace pipe and the right side of the lower furnace pipe; a discharge hole is formed in the bottom of the left side of the lower furnace pipe, and a high-temperature spiral conveyor (a discharge spiral conveyor) is arranged at the discharge hole; a water vapor waste gas outlet is arranged at the top of the upper furnace tube and is connected with a water spraying humidifier (a quench tower) of the waste gas treatment system; the top of the upper furnace body is provided with a combustion flue gas outlet and a smoke exhaust pipeline (chimney); the bottom of the lower furnace body is provided with a combustion chamber, and the combustion chamber is connected with a plurality of paths of gas pipes and a plurality of paths of air inlet pipes; each path of gas pipe is provided with a set of combustor; each air inlet pipe is provided with a fan (combustion-supporting air-mixing fan).
Further, the waste gas treatment system comprises a water spray humidifier (a quench tower), a steam-water separator, a heat exchanger, an activated carbon adsorption tank, an induced draft fan and an exhaust funnel which are connected in sequence; the cooling tower and the circulating water pump are connected with each other, a circulating water pump outlet is connected with a circulating water inlet of the heat exchanger, and a cooling tower inlet is connected with a circulating water outlet of the heat exchanger.
Further, the soil ex-situ remediation thermal desorption device also comprises a wastewater treatment system; the wastewater treatment system comprises a water collecting tank, a dosing tank, a filter press, a sedimentation tank, a water outlet tank and a water outlet pump which are connected in sequence; the system also comprises an open cooling tower and a reuse water pump which are connected with each other; the inlet of the open cooling tower is connected with the outlet of the sedimentation tank through a water pump; the outlet of the reuse water pump is respectively connected with the inlet of the water spray humidifier and the outlet of the high-temperature screw conveyer; the inlet of the water collecting tank is respectively connected with the wastewater outlet of the water spraying humidifier and the water outlet of the steam-water separator; the clear filtrate outlet of the filter press is connected with the outlet of the high-temperature screw conveyor.
Further, the combustor is integrated combustor, including the gas nozzle to and supporting gas valves: pressure regulating valve, operation valve, gas control solenoid valve, relief valve, ignition valve, flame detector, combustion controller, gas pressure switch etc..
Furthermore, the combustor is an integrated proportional adjustable combustor, the temperature is controlled in an automatic air-fuel ratio continuous proportional mode, and the load adjustment is proportional continuous adjustment.
Furthermore, the combustion chamber is connected with six gas pipes, and six sets of combustors are provided; the six gas pipes are connected with a gas main pipe; a manual flange ball valve is arranged at the inlet of the gas main pipe; the gas main pipe is provided with a gas quick cut-off valve connected with a gas pressure switch alarm and interlocking device.
Furthermore, an air filter is arranged at the inlet of the combustion-supporting air mixing cooler, and an adjustable air door is arranged at the joint of the combustion chamber and the air inlet pipe.
Further, the upper furnace pipe (drying area) is made of a 16Mn boiler steel seamless steel pipe; the lower furnace tube (baking zone) was made of SUS321 heat-resistant stainless seamless steel tube.
Furthermore, a fire-resistant layer is arranged in a furnace shell of the heating furnace body, and a heat-insulating layer is arranged between the furnace shell and the fire-resistant layer.
Furthermore, 1 bendable thermocouple (armored stainless steel K-type soft thermocouple) inserted into the furnace tube is respectively arranged at the flange cover panels at the discharge end of the upper furnace tube and the feed end of the lower furnace tube and used for monitoring the temperature of a high temperature region in the furnace tube (the temperature in the upper furnace tube is controlled to be 450 ℃ and the temperature in the lower furnace tube is controlled to be 650 ℃ respectively).
Further, four temperature monitoring thermocouples are arranged in the upper furnace body, and the temperature of the furnace in the upper furnace body is controlled to be 450-550 ℃ in combination with a combustion-supporting air-mixing fan; six temperature monitoring thermocouples are arranged in the lower-layer furnace body, and the six temperature monitoring thermocouples, controllers of six burners and gas control electromagnetic valves are used for jointly controlling the furnace temperature in the lower-layer furnace body to be 650 plus 750 ℃, so that the furnace temperature uniformity and the temperature control precision are ensured.
The utility model discloses a thermal desorption device is restoreed to soil dystopy's theory of operation (concrete work flow) as follows:
after the polluted soil is dug out by the digging machine, larger stones and sundries are firstly screened out by a vibrating screen, then the polluted soil is weighed by a weighing belt, then the polluted soil is sent into a feeding bin by a scraper machine, then the polluted soil is sent into a left feeding hole in an upper furnace tube by a rotary blade type feeder and a conveying belt (driven by a spiral transmission shaft), firstly dried for 10min (first-stage desorption) at the temperature of 350-.
The flue gas generated after the combustion of the fuel gas in the heating furnace body comes out from the combustion flue gas outlet at the top of the left side of the upper layer furnace body and is discharged through a smoke discharge pipeline (chimney).
The steam and the organic waste gas that the desorption produced, through the draught fan, the steam waste gas of stove pipe right side top draws forth the mouth and draws forth, send into exhaust treatment system: the waste gas and the waste water are separated sequentially through a steam-water separator, further cooled through a heat exchanger, sent into an activated carbon adsorption tank to adsorb harmful substances therein, and discharged after reaching the standard (discharged from an exhaust funnel). And circulating water discharged after heat exchange of the heat exchanger is cooled by the cooling tower and then pumped back to the inlet of the heat exchanger through the circulating water pump for recycling.
The waste water produced by water spraying of the water spraying humidifier (quench tower) and the waste water separated by the steam-water separator are sent into a waste water treatment system: firstly, the sewage enters a water collecting tank, then is pumped into a medicine adding tank, and then is pumped into a filter press to be subjected to filter pressing dehydration (separation of sludge and sewage), the filtered liquid is sent to the soil after being sprayed, humidified, dried and roasted (the soil sent out by a high-temperature screw conveyor, namely a discharging screw conveyor), and the separated sewage flows into a sedimentation tank to be separated into sludge and sewage; the separated sewage is divided into two parts, one part is pumped into an open cooling tower by a water pump to be cooled and then pumped out by a reuse water pump to be divided into two paths for spraying and reusing, one path is sent to a water spraying humidifier to spray and humidify water vapor waste gas led out from the top of an upper furnace tube, and the other path is sent to an outlet of a high-temperature screw conveyor to spray, humidify, dry and roast the roasted soil; the other part of the sewage enters a water outlet pool, and is pumped out by a water pump after reaching the standard through dosing treatment. Sludge cakes generated by filter pressing and dehydration of the filter press belong to solid wastes and can be buried. Circulating water after heat exchange of the heat exchanger is cooled by the cooling tower and then pumped back to the heat exchanger through the circulating water pump for recycling.
The utility model has the advantages that:
the utility model discloses a thermal desorption device is restoreed to soil dystopy is applicable to the stoving of the organic contaminated soil of higher concentration and burns off useless for the dystopy is handled. The existing drying and roasting kilns adopting a microbiological method and a thermal desorption method are mainly used for in-situ treatment.
The utility model discloses a thermal desorption device is restoreed to soil dystopy uses the spiral stoving roasting kiln of external heat dibit, adopts adjustable industry nozzle (combustor with adjustable integration proportion) and adjustable rotary vane batcher for heating temperature is adjustable in the stove, and reaction time, handling capacity are adjustable, can be used to the organic contaminated soil to different concentration, different components.
Compared with the prior art, the utility model, have following advantage: the equipment occupies less land, has low requirement on the field, high thermal desorption efficiency, low equipment failure rate, low energy consumption and convenient use.
The utility model discloses a thermal desorption device is restoreed to soil dystopy not only can be used to the stoving of the useless soil of loose danger to bake out useless, but also can be used to have the stoving of the organic contaminated soil of certain humidity to bake out useless.
Drawings
FIG. 1 is a schematic structural view of an external-heating double-position spiral drying and roasting kiln of the present invention;
fig. 2 is the structure schematic diagram and the process flow chart of the soil ex-situ remediation thermal desorption device of the utility model.
In the figure: 1. a vibrating screen 2, a weighing belt 3, a scraper 4, a feeding bin 5, an upper furnace body 6, a lower furnace body 7, an upper furnace tube 8, a lower furnace tube 9, a feeding port 10, a rotary vane feeder 11, a driving motor 12, an upper communicating tube 13, a lower communicating tube 13, a spiral conveying auger 14, a spiral transmission reducer 15, a discharging port 16, a high-temperature spiral conveyor 17, a smoke exhaust pipeline 18 and a water vapor waste gas outlet 19, the device comprises a water spraying humidifier 20, a combustor 21, a combustion-supporting air-cooling fan 22, a steam-water separator 23, a heat exchanger 24, an activated carbon adsorption tank 25, an induced draft fan 26, an exhaust funnel 27, an open cooling tower 28, a water collecting tank 29, a dosing tank 30, a filter press 31, a sedimentation tank 32, a water pump 33, a water outlet tank 34, a water outlet pump 35, a cooling tower 36, a circulating water pump 37 and a recycling water pump.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples.
Examples
As shown in fig. 1 and 2, the soil ex-situ remediation thermal desorption device of the utility model comprises an external thermal double-position spiral drying and roasting kiln, a waste gas treatment system and a waste water treatment system; the external heating double-position spiral drying roasting kiln comprises a heating furnace body, wherein the heating furnace body is formed by connecting, assembling and combining an upper layer furnace body 5 and a lower layer furnace body 6 through bolts, and the top of the lower layer furnace body 6 is communicated with the bottom of the upper layer furnace body 5; two upper furnace tubes 7 are arranged in the upper layer furnace body 5, and two lower furnace tubes 8 are arranged in the lower layer furnace body 6, namely the upper furnace tubes 7 and the lower furnace tubes 8 are respectively provided with two, and four furnace tubes are provided; the two upper furnace tubes 7 (drying area) are made of 16Mn boiler steel seamless steel tubes; the two lower furnace tubes 8 (firing zones) were made of SUS321 heat-resistant stainless seamless steel tubes.
A feed inlet 9 is arranged at the top of the left side of the upper furnace tube 7, and a rotary vane feeder 10 is arranged at the top of the feed inlet 9; a feeding bin 4 is arranged above the feeding ports of the two upper furnace tubes (the feeding bin 4 is a feeding duplex hopper bin), and the feeding ports 9 of the two upper furnace tubes 7 are respectively connected with outlets at the bottom of the feeding bin 4 through a rotary vane type feeder 10; the inlet of the feeding bin 4 is connected with the tail end of a scraper, and the front end of the scraper is connected with a weighing belt; a vibrating screen is arranged above the weighing belt; the rotary blade type feeder 10 is connected with a driving motor 11 through a transmission shaft, and the driving motor 11 is provided with a frequency converter; the upper furnace tube 7 and the lower furnace tube 8 are both internally provided with a spiral conveying auger 13 (also called a spiral conveyor and an auger), the spiral conveying auger 13 is driven by a spiral transmission speed reducer 14 (a worm gear speed reducer), and the spiral transmission speed reducer 14 is connected with a frequency converter and can carry out frequency conversion and speed regulation through the frequency converter; the working frequency of the rotary vane feeder 10 is consistent with the spiral conveying frequency of the spiral conveying auger 13 in the upper furnace tube 7 and the lower furnace tube 8 (namely the rotating speed of the driving motor 11 of the rotary vane feeder 10 is the same as the rotating speed of the spiral transmission reducer 14 of the spiral conveying auger 13), and the consistency of the front and rear feeding speeds is ensured; the working frequency of the rotary vane feeder 10 and the spiral conveying frequency of the spiral conveying auger 13 are both adjustable, so that the filling amount in the spiral conveying auger 13 and the material processing time are controlled; an up-down communicating pipe 12 is arranged between the right side of the upper furnace tube 7 and the right side of the lower furnace tube 8; a discharge hole 15 is formed in the bottom of the left side of the lower furnace tube 8, and a high-temperature spiral conveyor 16 (a discharge spiral conveyor) is arranged at the discharge hole 15; a water vapor waste gas outlet 18 is arranged at the top of the right side of the upper furnace tube 7 and is connected with a water spraying humidifier 19 (a quench tower) of the waste gas treatment system; the left top of the upper furnace body 5 is provided with a combustion flue gas outlet and a smoke exhaust pipeline 17 (chimney).
A combustion chamber is arranged at the bottom of the lower layer furnace body 6; the combustion chamber is connected with a plurality of paths of gas pipes, and each path of gas pipe is provided with a combustor 20; the combustion chamber is also connected with a plurality of air inlet pipes, and each air inlet pipe is provided with a combustion-supporting air mixing cooler 21. An air filter is arranged at the inlet of the combustion-supporting air mixing fan 21, and an adjustable air door is arranged at the joint of the combustion chamber and the air inlet pipe.
Six independent combustion control areas are arranged at the bottom of the lower furnace body 6, each area is provided with a combustor 20 (with an independent gas burner), each combustor 20 is arranged on one gas pipe, and six combustors 20 and six gas pipes are provided.
Six Italy Baide integrated burners 20(1428 KW/stand) are laterally arranged in a heating chamber at the bottom of the lower furnace body 6. This combustor 20 is integrated combustor, including the gas nozzle to and supporting gas valves: pressure regulating valve, operating valve, gas control solenoid valve, relief valve, ignition valve, flame detector, combustion controller, gas pressure switch, PID regulator etc.. The burner 20 is an integrated proportional adjustable burner and employs an automatic air-fuel ratio continuous proportional mode for temperature control. The burner 20 is of a monolithic construction, with load regulation being a proportional continuous regulation.
The six gas pipes are connected with a gas main pipe; a DN100 manual flange ball valve is arranged in front of an inlet of the gas main pipe. The gas system is also provided with necessary safety devices such as a gas pressure switch alarm and interlocking device, a gas quick cut-off valve and the like. The gas can be natural gas or liquefied gas.
When the gas-fired boiler works, a combustion controller (a PLC program controller) automatically controls the startup of the combustor, the low-pressure protection of the gas, the scavenging of a fan, the ignition of the gas, the load adjustment and the flameout protection by controlling a gas control electromagnetic valve according to a set program; the PID regulator compares the analog current signal transmitted by the temperature transmitter of the furnace with a set value to regulate the work load of the burner.
A fire-resistant layer is arranged in a furnace shell of the heating furnace body, and a heat-insulating layer is arranged between the furnace shell and the fire-resistant layer. The filling material of the heat insulation layer in the hearth is aluminum silicate heat insulation cotton, so that the overall weight of the equipment is reduced while the heat dissipation is reduced.
A DN600 maintenance manhole is arranged on the lower portion of the lower furnace pipe on one side of the lower furnace body, and internal parts of the maintenance furnace can be conveniently detected.
The flange cover panels of the discharge end of the upper furnace pipe and the feed end of the lower furnace pipe are respectively provided with 1 armored stainless steel K-type soft thermocouple (bendable thermocouple) with the thickness of 6mm, and the armored stainless steel K-type soft thermocouple is inserted into the furnace pipe for about 1m in length and is used for monitoring the temperature of a high-temperature area in the furnace pipe. The temperature in the upper furnace pipe is controlled at 350-450 ℃; the temperature in the lower furnace tube is controlled at 550-650 ℃.
4 temperature monitoring thermocouples are arranged in the upper furnace body, and the temperature of the furnace in the upper furnace body is controlled to be 450-550 ℃ in combination with a combustion-supporting air-mixing fan (cold air-mixing cooling); 6 temperature monitoring thermocouples are arranged in the lower-layer furnace body, and the lower-layer furnace body, a controller of 6 burners and a fuel gas control electromagnetic valve are used for jointly controlling the furnace temperature in the lower-layer furnace body to be 650 plus 750 ℃, so that the furnace temperature uniformity and the temperature control precision are ensured.
The speed of the spiral shaft of the spiral conveying auger in the upper furnace tube and the lower furnace tube is adjusted by changing the frequency of an 11Kw spiral transmission speed reducer (a worm gear speed reducer). The frequency converter operation panel is led out and installed on the control cabinet panel, and operation is convenient.
The feeding amount of the rotary vane type feeder is adjusted by changing the frequency of the driving motor. The working frequency of the rotary vane feeder (namely the frequency of a driving motor of the rotary vane feeder) is adaptive to the screw shaft conveying frequency of the screw conveying auger (namely the frequency of a screw transmission speed reducer) in the upper furnace tube and the lower furnace tube, and the frequency is determined to be increased gradually by groping in the test production stage so as to determine the proper front and rear feeding speed (kept at about 10 tons/hour), which is not too fast (otherwise, material blockage is caused, or the front and rear speed is not matched to cause material breakage conveying work). The frequency converter operation panel is led out and installed on the control cabinet panel, and operation is convenient.
The utility model relates to an external heating double-position spiral drying roasting kiln in a soil ex-situ remediation heat desorption device, wherein the heating mode of the device is external heating; the combustion temperature control mode is continuous proportional control (4-20mA output); the furnace tube arrangement structure is a double-station simultaneous working, 2+2 (furnace tube stacking), upper tube drying, lower tube high-temperature roasting and continuous processing; the power of the driving motors of the two rotary vane feeders is 1.5Kw (variable frequency speed regulation); the power of a spiral transmission speed reducer of the four spiral conveying augers is 11KW (variable frequency speed regulation), and the working rotating speed of the spiral shaft is 1-3 r/min (variable frequency speed regulation); the six combustors adopt Italy Baide (BGN150 type) integrated proportional combustors, the single heating power is 1428Kw, and the power of a combustor motor is 2.2 Kw; the power of the two combustion-supporting air-doping fans is 3KW (frequency conversion control), and the air quantity is 1500m3The wind pressure is 3-4 KPa.
The soil ex-situ remediation thermal desorption device also comprises an exhaust gas treatment system; the waste gas treatment system comprises a water spraying humidifier 19 (a quench tower), a steam-water separator 22, a heat exchanger 23, an activated carbon adsorption tank 24, an induced draft fan 25 and an exhaust funnel 26 which are connected in sequence; the heat exchanger further comprises a cooling tower 35 and a circulating water pump 36 which are connected with each other, an outlet of the circulating water pump 36 is connected with a circulating water inlet of the heat exchanger 23, and an inlet of the cooling tower 35 is connected with a circulating water outlet of the heat exchanger 23.
The soil remediation thermal desorption device adopting the external-heating double-position spiral drying roasting kiln further comprises a wastewater treatment system; the wastewater treatment system comprises a water collecting tank 28, a dosing tank 29, a filter press 30, a sedimentation tank 31, a water outlet tank 33 and a water outlet pump 32 which are connected in sequence; also comprises an open cooling tower 27 and a reuse water pump 37 which are connected with each other; the inlet of the open cooling tower 27 is connected with the outlet of the sedimentation tank 31 through a water pump; the outlet of the reuse water pump 37 is respectively connected with the inlet of the water spray humidifier 19 and the outlet of the high-temperature screw conveyor 16; the inlet of the water collecting tank 28 is respectively connected with the wastewater outlet of the water spraying humidifier 19 and the water outlet of the steam-water separator 22; the filtrate outlet of the filter press 30 is connected with the outlet of the high-temperature screw conveyor 16.
The utility model discloses a thermal desorption device is restoreed to soil dystopy's theory of operation (concrete work flow) as follows:
as shown in figure 2, after the polluted soil is dug out by the digging machine, the polluted soil is firstly screened by a vibrating screen 1 to remove larger stones and impurities, then weighed by a weighing belt 2, sent to a feeding bin 4 by a scraper machine 3, then sent to a left side feeding port 9 in an upper furnace tube 7 by a rotary blade type feeder 10, firstly dried for 10min at 450 ℃ in the upper furnace tube 7 (first-stage desorption), then sent to the right side by a spiral conveying auger 13 in the upper furnace tube 7, then sent to the right side by an upper and lower communicating tube 12, desorbed and reacted for 10min at 650 ℃ in the lower furnace tube 8 (second-stage desorption), sent to the left side by a spiral conveying auger in the lower furnace tube 8, finally sent out by a high temperature spiral conveyor 16 (discharging spiral conveyor) at a discharging port 15 at the bottom of the left side of the lower furnace tube 8, humidified and roasted soil is cooled and sprayed with water, and then the waste water is reused.
The flue gas generated after the combustion of the fuel gas in the heating furnace body comes out from the combustion flue gas outlet at the top of the left side of the upper layer furnace body 5 and is discharged through a flue gas discharge pipe 17 (chimney).
The steam and the organic waste gas that the desorption produced, through draught fan 25, the steam waste gas of following the top of last stove pipe 7 right side draws forth mouth 18, send into the exhaust-gas treatment system: the waste gas and the waste water are separated through a steam-water separator 22, further cooled through a heat exchanger 23, sent to an activated carbon adsorption tank 24 to adsorb harmful substances therein, and discharged after reaching the standard (discharged from an exhaust funnel 26).
Circulating water which is discharged after heat exchange of the heat exchanger 23 is cooled by the cooling tower 35 and then pumped back to the inlet of the heat exchanger 23 through the circulating water pump 36 for recycling.
The waste water generated by water spraying of the water spraying humidifier 19 and the waste water separated by the steam-water separator 22 are sent to a waste water treatment system: firstly, the sewage enters a water collecting tank 28, then is pumped into a medicine adding tank 29, and then is pumped into a filter press 25 for filter pressing dehydration, the filtered liquid is sent to the soil after being sprayed, humidified, dried and roasted (the soil sent out by a high-temperature screw conveyor 16, namely a discharging screw conveyor), and the separated sewage flows into a sedimentation tank 31 to separate sludge and sewage; the separated sewage is divided into two parts, one part is sprayed to an open cooling tower 27 through a water pump 32 to be cooled and then is sprayed out through a reuse water pump 37 to be divided into two paths for spraying and reusing, one path is sent to a water spraying humidifier 19 to spray and humidify the water vapor waste gas led out from the top of an upper furnace tube 7, and the other path is sent to an outlet of a high-temperature screw conveyor 16 to spray, humidify, dry and roast the roasted soil; the other part enters a water outlet pool 33, and is pumped out by a water pump 34 after reaching the standard through dosing treatment. Sludge cakes generated by filter pressing and dehydration of the filter press 25 belong to solid wastes and can be buried. Circulating water after heat exchange of the heat exchanger 23 is cooled by the cooling tower 35 and then pumped back to the heat exchanger 23 through the circulating water pump 36 for recycling.
Claims (10)
1. A soil ex-situ remediation thermal desorption device is characterized by comprising an external heat double-position spiral drying and roasting kiln and a waste gas treatment system connected with the external heat double-position spiral drying and roasting kiln; the external heating double-position spiral drying and roasting kiln comprises a heating furnace body; the heating furnace body is formed by connecting, assembling and combining an upper layer furnace body and a lower layer furnace body through bolts, wherein the top of the lower layer furnace body is communicated with the bottom of the upper layer furnace body; two upper furnace tubes are arranged in the upper layer furnace body, and two lower furnace tubes are arranged in the lower layer furnace body; a feed inlet is arranged at the top of the left side of the upper furnace tube, and a rotary vane feeder is arranged at the top of the feed inlet; a feeding bin is arranged above the feeding ports of the two upper furnace tubes, the feeding bin is a feeding duplex hopper bin, and the feeding ports of the two upper furnace tubes are respectively connected with an outlet at the bottom of the feeding bin through a rotary vane type feeder; the inlet of the feeding bin is connected with the tail end of the scraper conveyor, and the front end of the scraper conveyor is connected with the weighing belt; a vibrating screen is arranged above the weighing belt; the rotary vane feeder is connected with a driving motor with a frequency converter; the upper furnace tube and the lower furnace tube are internally provided with spiral conveying augers which are connected with a spiral transmission speed reducer with a frequency converter; the working frequency of the rotary vane feeder is consistent with the spiral conveying frequency of the spiral conveying auger in the upper furnace tube and the lower furnace tube, namely the rotating speed of a driving motor of the rotary vane feeder is the same as the rotating speed of a spiral transmission speed reducer of the spiral conveying auger, so that the consistency of the front feeding speed and the rear feeding speed is ensured; an upper communicating pipe and a lower communicating pipe are arranged between the right side of the upper furnace pipe and the right side of the lower furnace pipe; a discharge hole is formed in the bottom of the left side of the lower furnace pipe, and a high-temperature screw conveyor is arranged at the discharge hole; a water vapor waste gas outlet is arranged at the top of the upper furnace tube and is connected with a water spraying humidifier of the waste gas treatment system; the top of the upper furnace body is provided with a combustion flue gas outlet and a smoke exhaust pipeline; the bottom of the lower furnace body is provided with a combustion chamber, and the combustion chamber is connected with a plurality of paths of gas pipes and a plurality of paths of air inlet pipes; each path of gas pipe is provided with a set of combustor; and a fan, namely a combustion-supporting air-mixing fan, is arranged on each air inlet pipe.
2. An ex-situ soil remediation thermal desorption device as claimed in claim 1, wherein the waste gas treatment system comprises a water spray humidifier, a steam-water separator, a heat exchanger, an activated carbon adsorption tank, an induced draft fan and an exhaust funnel which are connected in sequence; the cooling tower and the circulating water pump are connected with each other, a circulating water pump outlet is connected with a circulating water inlet of the heat exchanger, and a cooling tower inlet is connected with a circulating water outlet of the heat exchanger.
3. An ex-situ soil remediation thermal desorption device as claimed in claim 2 wherein the ex-situ soil remediation thermal desorption device further comprises a wastewater treatment system; the wastewater treatment system comprises a water collecting tank, a dosing tank, a filter press, a sedimentation tank, a water outlet tank and a water outlet pump which are connected in sequence; the system also comprises an open cooling tower and a reuse water pump which are connected with each other; the inlet of the open cooling tower is connected with the outlet of the sedimentation tank through a water pump; the outlet of the reuse water pump is respectively connected with the inlet of the water spray humidifier and the outlet of the high-temperature screw conveyer; the inlet of the water collecting tank is respectively connected with the wastewater outlet of the water spraying humidifier and the water outlet of the steam-water separator; the clear filtrate outlet of the filter press is connected with the outlet of the high-temperature screw conveyor.
4. A soil ex-situ remediation thermal desorption device as claimed in claim 1, 2 or 3 wherein the burner is an integrated burner comprising a gas burner and a matched gas valve bank: pressure regulating valve, operating valve, gas control solenoid valve, relief valve, ignition valve, flame detector, combustion controller, gas pressure switch.
5. An ex-situ soil remediation thermal desorption device as claimed in claim 4 wherein the burner is an integrated proportional adjustable burner, the temperature is controlled in an automatic air-fuel ratio continuous proportional manner, and the load is adjusted in a proportional continuous manner.
6. A soil ex-situ remediation thermal desorption device as claimed in claim 5, wherein the combustion chamber is connected with six gas pipes, and six sets of burners are provided; the six gas pipes are connected with a gas main pipe; a manual flange ball valve is arranged at the inlet of the gas main pipe; the gas main pipe is provided with a gas quick cut-off valve connected with a gas pressure switch alarm and interlocking device.
7. An ex-situ soil remediation thermal desorption device as claimed in claim 6 wherein an air filter is provided at the inlet of the combustion-supporting air-entraining fan; an adjustable air door is arranged at the joint of the combustion chamber and the air inlet pipe.
8. An ex-situ soil remediation thermal desorption device as claimed in claim 7, wherein the flange cover panels at the discharge end of the upper furnace tube and the feed end of the lower furnace tube are respectively provided with a bendable thermocouple inserted into the furnace tube for monitoring the temperature of the high temperature zone in the furnace tube; four temperature monitoring thermocouples are arranged in the upper furnace body, and the temperature of the furnace in the upper furnace body is controlled by combining with a combustion-supporting air-mixing fan; six temperature monitoring thermocouples are arranged in the lower-layer furnace body, and are combined with controllers of six burners and fuel gas control electromagnetic valves to control the temperature of the furnace in the lower-layer furnace body.
9. An ex-situ soil remediation thermal desorption device as claimed in claim 1, 2 or 3 wherein the upper furnace pipe is made of 16Mn boiler steel seamless steel pipe; the lower furnace tube is made of SUS321 heat-resistant stainless steel seamless steel tube.
10. An ex-situ soil remediation thermal desorption device as claimed in claim 1, 2 or 3 wherein a fire-resistant layer is provided inside the furnace shell of the heating furnace body and a heat-insulating layer is provided between the furnace shell and the fire-resistant layer.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112958612A (en) * | 2021-03-09 | 2021-06-15 | 上海格林曼环境技术有限公司 | In-situ thermal desorption method for repairing organic contaminated soil |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112958612A (en) * | 2021-03-09 | 2021-06-15 | 上海格林曼环境技术有限公司 | In-situ thermal desorption method for repairing organic contaminated soil |
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