CN114939597A - Skid-mounted rapid emergency soil thermal desorption device - Google Patents
Skid-mounted rapid emergency soil thermal desorption device Download PDFInfo
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- CN114939597A CN114939597A CN202210591457.9A CN202210591457A CN114939597A CN 114939597 A CN114939597 A CN 114939597A CN 202210591457 A CN202210591457 A CN 202210591457A CN 114939597 A CN114939597 A CN 114939597A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/06—Reclamation of contaminated soil thermally
- B09C1/065—Reclamation of contaminated soil thermally by pyrolysis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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Abstract
The invention provides a skid-mounted rapid emergency soil thermal desorption device, which comprises a fixed frame, a high-temperature furnace, a soil discharge chamber, a high-temperature cyclone dust collector, a high-temperature ceramic dust collector, a catalytic degradation device, an active carbon adsorber and two-stage indirect condensers, wherein the high-temperature ceramic dust collector and the catalytic degradation device are communicated through the two-stage indirect condensers; the high-temperature furnace, the soil discharge chamber, the high-temperature cyclone dust collector, the high-temperature ceramic dust collector, the two-stage indirect condenser and the activated carbon adsorber are all fixedly arranged on the fixed frame, and the catalytic degradation device is arranged in the high-temperature furnace. The skid-mounted rapid emergency soil thermal desorption device provided by the invention has the advantages that the heat utilization rate in the combustion chamber is improved, the equipment volume is small, and the skid-mounted rapid emergency soil thermal desorption device can be used for treating sudden soil pollution.
Description
Technical Field
The invention belongs to the technical field of soil remediation treatment, and particularly relates to a skid-mounted rapid emergency soil thermal desorption device.
Background
The existing thermal desorption equipment has the problems of laggard process, low integration level and the like, so that the whole set of equipment occupies large area and has poor mobility. 6 heavy trucks are needed for conventional indirect thermal desorption transportation, and the construction preparation period is as long as 10-15 days. The direct thermal desorption equipment needs 15-20 heavy trucks for transportation, and the construction preparation period is as long as 30-45 days. The response time is long, and the emergency use requirement cannot be met. In addition, the conventional method for purifying pollutants in the generated thermal desorption gas samples processes such as spraying and condensation, and a large amount of waste liquid mixed by cooling water and pollutants is generated in the treatment process. The large volume of waste liquid requires disposal in large volumes of chemical degradation or bioremediation tanks. Therefore, the prior art and the equipment technology are complex in process, generate a large amount of waste liquid to be treated, and are high in manufacturing and treatment costs.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the utility model provides a quick emergent soil thermal desorption device of sled dress formula, whole device is small, and the transportation of being convenient for can be used to proruption soil pollution and deal with, and when restoreing fast and pollute soil, guarantees the safe emission of tail gas.
In order to solve the technical problem, the embodiment of the invention adopts the following technical scheme:
the embodiment of the invention provides a skid-mounted rapid emergency soil thermal desorption device which comprises a fixing frame, a high-temperature furnace, a soil discharge chamber, a high-temperature cyclone dust collector, a high-temperature ceramic dust collector, a catalytic degradation device, an active carbon adsorber and two-stage indirect condensers, wherein the high-temperature furnace, the soil discharge chamber, the high-temperature cyclone dust collector, the high-temperature ceramic dust collector, the catalytic degradation device and the active carbon adsorber are sequentially communicated; the high-temperature furnace, the soil discharge chamber, the high-temperature cyclone dust collector, the high-temperature ceramic dust collector, the two-stage indirect condenser and the activated carbon adsorber are all fixedly mounted on the fixing frame, and the catalytic degradation device is arranged in the high-temperature furnace.
As a further improvement of the embodiment of the invention, the high-temperature furnace comprises a furnace body, a hearth, an igniter, a support, a heat storage material layer and a driving piece, wherein the hearth is arranged in an inner cavity of the furnace body through the support, and the igniter is arranged on the inner wall of the furnace body; the heat storage material layer is arranged at the feed end of the hearth and is filled between the inner wall of the furnace body and the outer wall of the hearth; the discharge end of the hearth is communicated with the soil discharge chamber; the driving piece is connected with the hearth and used for driving the hearth to rotate in the inner cavity of the furnace body, and the driving piece is arranged outside the furnace body.
As a further improvement of the embodiment of the invention, the temperature in the high-temperature furnace is 300-900 ℃; the temperature of the feed end of the hearth is 100-300 ℃.
As a further improvement of the embodiment of the invention, the hearth is obliquely arranged, the feeding end is higher than the discharging end, and the inclination angle is 5-10 degrees.
As a further improvement of the embodiment of the invention, the furnace further comprises a feeding piece, wherein the feeding piece is communicated with the feeding end of the hearth and is arranged outside the furnace body.
As a further improvement of the embodiment of the present invention, the two-stage indirect condenser includes a cooling chamber, a first air inlet, a first air distribution chamber, a first condenser pipe, a first pollutant collection chamber and a first air outlet which are sequentially communicated, and a second air inlet, a second air distribution chamber, a second condenser pipe, a second pollutant collection chamber and a second air outlet which are sequentially communicated; the first condensation pipe and the second condensation pipe are both arranged in the cooling chamber; the first gas inlet is communicated with an outlet of the high-temperature ceramic dust remover, and the first gas outlet is communicated with an inlet of the catalytic degradation device; the second air inlet is communicated with the outlet of the catalytic degradation device, and the second air outlet is communicated with the inlet of the activated carbon absorber.
As a further improvement of the embodiment of the present invention, the first condensation duct is located above the second condensation duct.
As a further improvement of the embodiment of the invention, the top end of the cooling chamber is provided with a cooling water outlet, and the bottom end of the cooling chamber is provided with a cooling water inlet; the skid-mounted rapid emergency soil thermal desorption device further comprises a cooling tower, wherein an inlet of the cooling tower is communicated with a cooling water outlet, and an outlet of the cooling tower is communicated with the cooling water inlet.
As a further improvement of the embodiment of the invention, the device also comprises an air chamber containing a draught fan and an exhaust chimney, wherein the inlet of the air chamber is communicated with the outlet of the activated carbon adsorber, and the outlet of the air chamber is communicated with the exhaust chimney.
As a further improvement of the embodiment of the invention, the side surface of the soil discharging chamber is provided with an inlet, the bottom of the soil discharging chamber is provided with a soil discharging hopper, the upper part of the soil discharging chamber is provided with an air outlet, the inlet of the soil discharging chamber is communicated with the outlet of the high-temperature furnace, and the air outlet of the soil discharging chamber is communicated with the inlet of the high-temperature cyclone dust collector.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
(1) the device is provided with a high-temperature furnace, a high-temperature cyclone dust collector, a high-temperature ceramic dust collector, a catalytic degradation device, a two-stage indirect condenser and an activated carbon adsorber, and is used for heating and desorbing organic contaminated soil, purifying thermal desorption gas, condensing thermal desorption gas, catalyzing, reducing, oxidizing, degrading and re-purifying the thermal desorption gas, realizing the rapid repair of the contaminated soil and ensuring the safe emission of tail gas.
(2) Adopt sled dress mounting means all to integrate all parts on the mount, reduce the volume of integrated device, the bulk movement of being convenient for when emergency appears, can carry out the high-speed response, can go to accident site fast with its loading transportation and restore, processes such as the dismouting need not to the process.
(3) The catalytic degradation device is integrated in the high-temperature furnace, the catalytic degradation device directly utilizes heat energy in the high-temperature furnace for catalytic degradation, a heat source is not required to be additionally arranged on the catalytic degradation device, the size of the whole device is reduced, the transportation is convenient, and the catalytic degradation device can be used for treating sudden soil pollution.
(4) The thermal desorption gas containing high-concentration pollutants purified by the dust remover and the gas containing low-concentration pollutants after catalytic degradation are condensed by the same indirect condenser, so that the volume of the whole device is reduced, and the transportation is facilitated; and an indirect condensation mode is adopted, so that a large amount of polluted waste liquid can not be generated.
Drawings
Fig. 1 is a schematic structural diagram of a skid-mounted rapid emergency soil thermal desorption device according to an embodiment of the invention;
FIG. 2 is a schematic view of the high temperature furnace according to the embodiment of the present invention;
fig. 3 is a schematic structural diagram of a two-stage indirect condenser in an embodiment of the invention.
In the figure: 1 high-temperature furnace, 2 soil discharge chamber, 3 high-temperature cyclone dust collector, 4 high-temperature ceramic dust collector, 5 two-stage indirect condenser, 6 catalytic degradation device, 7 activated carbon adsorber, 8 air chamber, 9 cooling tower, 10 exhaust chimney, 11 fixing frame, 101 feeding piece, 102 hearth, 103 furnace body, 104 igniter, 105 support, 106 heat storage material layer, 107 gear, 108 discharge end, 109 motor, 201 soil discharge hopper, 202 air outlet, 501 first air inlet, 502 first air distribution chamber, 503 first condenser pipe, 504 first pollutant collection chamber, 505 first air outlet, 506 first pollutant discharge outlet, 507 second air distribution chamber, 508 second air inlet, 509 second pollutant discharge outlet, 510 second air outlet, 511 cooling water inlet, 512 cooling water outlet, 513 second condenser pipe.
Detailed Description
The technical solution of the present invention will be explained in detail below.
The embodiment of the invention provides a skid-mounted rapid emergency soil thermal desorption device, which comprises a fixed frame 11, and a high-temperature furnace 1, a soil discharge chamber 2, a high-temperature cyclone dust collector 3, a high-temperature ceramic dust collector 4, a catalytic degradation device 6 and an activated carbon adsorber 7 which are sequentially communicated with one another, as shown in figure 1. The device also comprises a two-stage indirect condenser 5, wherein the high-temperature ceramic dust remover 4 is communicated with the catalytic degradation device 6 through the two-stage indirect condenser 5, and the catalytic degradation device 6 is communicated with the activated carbon absorber 7 through the two-stage indirect condenser 5. The high-temperature furnace 1, the soil discharge chamber 2, the high-temperature cyclone dust collector 3, the high-temperature ceramic dust collector 4, the two-stage indirect condenser 5 and the activated carbon adsorber 7 are all fixedly arranged on a fixed frame 11, and the catalytic degradation device 6 is arranged in the high-temperature furnace 1.
The high-temperature furnace 1 is used for heating the organic contaminated soil, and organic pollutants in the organic contaminated soil are heated and evaporated to form thermal desorption gas. The soil discharge chamber 2 is used for collecting the repaired soil obtained after the thermal desorption treatment in the high-temperature furnace 1. The temperature of the thermal desorption gas generated by the high temperature furnace 1 is generally 100-500 ℃, and the concentration of the organic pollutants is generally 1000-100000 ppm. The high-temperature cyclone dust collector 3 is used for removing large soil particles in the thermal desorption gas, and the high-temperature ceramic dust collector 4 is used for further removing fine particles in the thermal desorption gas discharged from the high-temperature cyclone dust collector 3. The high-temperature cyclone dust collector 3 and the high-temperature ceramic dust collector 4 can work in the temperature environment of more than 1000 ℃. Through high temperature cyclone 3 and high temperature ceramic dust remover 4, realize the separation of granule in the thermal desorption gas under the high temperature and organic pollutant in the gaseous phase, prevent that a large amount of granules scale deposit or block up the pipeline in the indirect condenser, reduce the volume of condensate simultaneously. The two-stage indirect condenser 5 is used for condensing gas-phase organic pollutants in the thermal desorption gas to form liquid organic pollutants, so that the concentration of the pollutants in the thermal desorption gas is reduced, and at the moment, the concentration of organic matters in the desorption gas output by the two-stage indirect condenser 5 is 5-100 ppm. The catalytic degradation device 6 is used for carrying out catalytic reduction oxidative degradation on organic pollutants in the gas output by the two-stage indirect condenser 5, and the catalytic degradation device 6 adopts catalysts such as nano titanium oxide or vanadium pentoxide or mixed catalysts, and can reduce and oxidize organic pollutants containing halogen and the like at high temperature or directly oxidize hydrocarbon organic pollutants. The two-stage indirect condenser 5 is further used for condensing the organic pollutant gas which is not completely degraded in the catalytic degradation device 6 into a liquid state for collection. The activated carbon adsorber 7 is used for purifying the tail gas formed by the catalytic degradation device 6 to obtain clean purified gas.
The skid-mounted rapid emergency soil thermal desorption device provided by the embodiment is provided with the high-temperature furnace 1, the high-temperature cyclone dust collector 3, the high-temperature ceramic dust collector 4, the catalytic degradation device 6, the two-stage indirect condenser 5 and the activated carbon adsorber 7, and after organic contaminated soil is subjected to heating desorption, desorption gas purification, condensation, catalytic reduction, oxidation and degradation and re-purification, rapid remediation of the contaminated soil is realized, and safe emission of tail gas is ensured. Adopt sled dress mounting means all to integrate all parts on the mount, reduce the volume of integrated device, the bulk movement of being convenient for when emergency appears, can carry out the high-speed response, can go to accident site fast with its loading transportation and restore, processes such as the dismouting need not to the process. The catalytic degradation device is integrated in the combustion chamber, the heat energy in the high-temperature furnace is directly utilized, a heat source is not required to be additionally arranged on the catalytic degradation device, the size of the whole device is reduced, the transportation is convenient, and the catalytic degradation device can be used for treating sudden soil pollution. The thermal desorption gas containing high-concentration pollutants purified by the dust remover and the waste gas containing low-concentration pollutants subjected to catalytic degradation are condensed by the same indirect condenser, so that the volume of the whole device is reduced, and the transportation is facilitated. And an indirect condensation mode is adopted, so that a large amount of polluted waste liquid can not be generated.
As a preferable example, as shown in fig. 2, the high temperature furnace 1 includes a furnace body 103, a furnace chamber 102, a support 105, a heat storage material layer 106, a driving member, and an igniter 104. The catalytic degradation device 6 is positioned in the inner cavity of the furnace body. The hearth 102 is installed in the inner cavity of the furnace body 103 through a support 105, and a bearing is arranged between the hearth 102 and the support 105. The driving piece is arranged outside the furnace body 103 and is connected with the hearth 102 and used for driving the hearth 102 to rotate along the axial line of the hearth in the inner cavity of the furnace body 103. Preferably, there are at least two supports 105, one at each end of the furnace 102. In this embodiment, the driving member includes a motor 109 and two gears 107 engaged with each other, the motor is connected to one of the gears, and the other gear is sleeved on the outer wall of the furnace chamber 102. The motor operation, driving piece and the gear rotation of being connected to drive another gear and furnace 102 rotation, make the organic pollutant in the contaminated soil volatilize ground more thoroughly, improve the volatilization effect. The igniter 104 is arranged on the inner wall of the furnace body 1, and ignites and burns in the inner cavity of the furnace body to supply heat, so that the temperature in the furnace body is 300-900 ℃. The two ends of the hearth are respectively a feeding end and a discharging end, the discharging end of the hearth 102 is communicated with the soil discharging chamber 2, and the feeding end of the hearth is communicated with the feeding part 101. The feeding piece 101 is arranged outside the furnace body 103 and is used for adding organic contaminated soil into the hearth 102. The heat storage material layer 106 is arranged at the feeding end of the hearth 102, and the heat storage material layer 106 is a honeycomb ceramic heat storage body and is filled between the inner wall of the furnace body 103 and the outer wall of the hearth 102. The heat storage material layer 106 absorbs heat in the furnace body, so that the temperature of the feed end of the hearth wrapped by the heat storage material layer is 100-300 ℃.
In the preferred embodiment, the hearth is arranged in the inner cavity of the furnace body and used for placing the polluted soil, the ignition combustion in the furnace body generates heat, the polluted soil is heated through the heat conduction of the side wall of the hearth, the polluted soil is not contacted with any gas, the size of the equipment is not increased, the thermal desorption treatment effect is improved, and organic matters in the organic polluted soil form thermal desorption gas as completely as possible. Meanwhile, the soil does not participate in combustion, a large amount of smoke is not generated, a tail gas treatment device is not required, and the volume of the whole equipment is reduced. The heat generated by combustion in the furnace body can heat the soil in the furnace chamber to realize thermal desorption treatment of the soil, and can also provide heat energy for the catalytic degradation device 6 to realize catalytic reduction and oxidation of organic pollutants, thereby improving the utilization rate of the heat energy in the furnace body. Fill heat accumulation material layer 106 in the outside of furnace feed end for the temperature of furnace feed end is 100 ~ 300 ℃, and contaminated soil is just preheated the dewatering at the furnace feed end, is reheated after reaching the afterbody in the furnace, prevents the post-processing in-process, and soil is because the moisture content is high, and the caking that becomes to agglomerate in rotatory in-process influences organic pollutant's volatilization. After the polluted soil body is dug out for restoration, in order to prevent slightly polluted soil from existing around the polluted soil body, the soil on the side wall of the polluted pit is also dug out for thermal desorption treatment. At this moment, because the contaminated probability of contaminated pit lateral wall soil is lower or the contaminated degree is lighter, put into furnace after, can stop the ignition burning, the heat that utilizes the heat accumulation material layer to accumulate can carry out thermal desorption with this partial soil and handle, plays energy saving, cost-effective effect.
Further preferably, furnace 102 slope sets up, and the feed end is higher than the discharge end, and inclination is 5 ~ 10. Because the feed end is higher than the discharge end, the contaminated soil rotates along with the furnace after being thrown from the feed end and slowly moves towards the discharge end to form a spiral moving path, so that the heating time of the contaminated soil in the furnace is prolonged, the sudden heating surface of the contaminated soil is increased, the volatilization effect of organic pollutants is improved, and the thermal desorption effect is improved.
Preferably, an inlet is formed in the side surface of the soil discharging chamber 2, a soil discharging hopper 201 is formed in the bottom of the soil discharging chamber, an air outlet 202 is formed in the upper portion of the soil discharging chamber 2, the inlet of the soil discharging chamber 2 is communicated with an outlet (a discharging end of a hearth) of the high temperature furnace 1, and the air outlet 202 of the soil discharging chamber 2 is communicated with an inlet of the high temperature cyclone 3. After the soil and the thermal desorption gas subjected to thermal desorption treatment in the hearth enter the soil discharge chamber 2, the soil subjected to thermal desorption treatment is discharged from the soil discharge hopper 201 at the bottom, in-situ backfilling is realized, and the thermal desorption gas enters the high-temperature cyclone dust collector 3 from the gas outlet at the upper part.
As a preferable example, as shown in fig. 3, the two-stage indirect condenser 5 includes a cooling chamber filled with cooling water, a first air inlet 501, a first air distribution chamber 502, a first condenser pipe 503, a first pollutant collection chamber 504 and a first air outlet 505 which are communicated in sequence, and a second air inlet 508, a second air distribution chamber 507, a second condenser pipe, a second pollutant collection chamber and a second air outlet 509 which are communicated in sequence. The first condensation duct 503 and the second condensation duct are both provided in the cooling chamber. The first air inlet 501 is communicated with the outlet of the high-temperature ceramic dust remover 4, and the first air outlet 505 is communicated with the inlet of the catalytic degradation device 6. The second gas inlet 508 is communicated with the outlet of the catalytic degradation device 6, and the second gas outlet 509 is communicated with the inlet of the activated carbon adsorber 7. The first contaminant trap chamber 504 is also provided with a first contaminant discharge outlet 506 for discharging a highly concentrated contaminated liquid. The second pollutant collecting chamber is provided with a second pollutant discharge port for discharging low-concentration polluted liquid.
The first condenser pipe can be arranged in a zigzag manner, the inlet of the first condenser pipe is communicated with the first gas distribution chamber, the outlet of the first condenser pipe is communicated with the first pollutant collection chamber, and the inlet is positioned above the outlet, so that high-concentration pollutant liquid formed after condensation can smoothly flow into the first pollutant collection chamber 504 under the action of gravity. The first condenser pipes can also be arranged in an inclined straight line shape and a plurality of condenser pipes are arranged in parallel, inlets of all the first condenser pipes are communicated with the first gas distribution chamber, outlets of all the first condenser pipes are communicated with the first pollutant collection chamber, and the inlets are all positioned above the outlets, so that high-concentration pollutant liquid formed after condensation can smoothly flow into the first pollutant collection chamber 504 under the action of gravity. Similarly, the second condenser pipe can be arranged in a Z shape, the inlet of the second condenser pipe is communicated with the second gas distribution chamber, the outlet of the second condenser pipe is communicated with the second pollutant collection chamber, and the inlet is positioned above the outlet, so that the low-concentration pollutant liquid formed after condensation can smoothly flow into the second pollutant collection chamber under the action of gravity. The second condenser pipe also can be the straight line type of slope and lay and many parallels, and the entry and the second of all second condenser pipes distribute the gas room intercommunication, and the export and the second pollutant of all second condenser pipes collect the room intercommunication, and the entry all is located the export top, and the low concentration that forms after the condensation of being convenient for flows into the second pollutant smoothly under the action of gravity and collects the room.
In the above embodiment, the desorbed gas from which fine particles are removed by the high-temperature ceramic dust collector 4 enters the first gas distribution chamber 502 through the first gas inlet 501, and then enters the first condensation pipe for cooling, the high-concentration pollutant liquid and the low-concentration pollutant gas formed after cooling enter the first pollutant collection chamber 504, and the low-concentration pollutant gas enters the catalytic degradation device 6 through the first gas outlet 505. The organic pollutant gas which is not completely degraded in the catalytic degradation device 6 enters a second gas distribution chamber 507 through a second gas inlet 508, then enters a second condensing pipe for cooling, the low-concentration pollutant liquid and the purified tail gas which are formed after cooling enter a second pollutant collecting chamber, and the purified tail gas enters an activated carbon adsorber 7 through a second gas outlet 509. This preferred embodiment carries out the one-level condensation to the thermal desorption gas that contains the high concentration pollutant after the dust remover purifies earlier, carries out the second grade condensation with the gaseous catalytic degradation after the one-level condensation waste gas that contains the low concentration pollutant that obtains again, and same indirect condenser is shared in the two-stage condensation, and mutual noninterference reduces whole device volume, the transportation of being convenient for. The two-stage condensation adopts an indirect condensation mode, and a large amount of polluted waste liquid can not be generated.
Further preferably, the top end of the cooling chamber is provided with a cooling water outlet 511, and the bottom end of the cooling chamber is provided with a cooling water inlet 510. Quick emergent soil thermal desorption device of sled dress formula still includes cooling tower 9, and cooling tower 9 entry is connected with cooling water outlet 511, and cooling tower 9 export is connected with cooling water inlet 510. The cooling water after 9 cooling of cooling tower gets into from the bottom of cooling chamber for the cooling water that the temperature is low rises from the cooling chamber bottom gradually, fully carries out the heat transfer with first condenser pipe and second condenser pipe, absorbs the heat after from the cooling chamber top output, improves the cooling effect to the desorption gas.
Considering that the gas after the first-stage condensation needs to enter a catalytic degradation device for catalytic reduction and oxidation, and the catalytic reduction needs to be heated, the first-stage condensation does not need to be cooled to too low temperature, and the temperature of the upper cooling water in the cooling chamber is higher than that of the lower cooling water, so that the upper cooling effect is inferior to the lower cooling effect, the lower cooling water has low temperature, the cooling efficiency is high, the pollutant concentration in the discharged flue gas can be effectively reduced, and the high-efficiency cooling and standard discharge of the pollutant concentration in the flue gas are realized. Further preferably, the first condensation pipe is arranged at the upper part of the cooling chamber, and the second condensation pipe is arranged at the lower part of the cooling chamber, so that the secondary cooling effect is better, and the re-trapping effect of low-concentration pollutants is improved.
As a preferred example, the thermal desorption device of the present embodiment further includes an air chamber 8 including an induced draft fan and an exhaust chimney 10, an inlet of the air chamber 8 is communicated with an outlet of the activated carbon adsorber 7, and an outlet of the air chamber 8 is communicated with an inlet of the exhaust chimney 10. The induced draft fan in the air chamber 8 operates to generate negative pressure, the gas is guided to flow to the air chamber 8 through the hearth, the soil discharge chamber 2, the high-temperature cyclone dust collector 3, the high-temperature ceramic dust collector 4, the two-stage indirect condenser 5, the catalytic degradation device 6 and the activated carbon absorber 7 in sequence, and finally the clean gas is discharged from the exhaust chimney 10. The inlet of the exhaust chimney is communicated with the inner cavity of the furnace body at the same time and is used for discharging flue gas generated by combustion in the furnace body.
The work flow of the skid-mounted rapid emergency soil thermal desorption device of the preferred embodiment is as follows:
the igniter 104 is turned on, diesel oil in the diesel tank is sent into the furnace body 103 by using the diesel oil pump to be combusted, and smoke generated in the furnace body 1 is discharged by the exhaust chimney 10.
When the temperature of the hearth 102 reaches the set working condition temperature, the contaminated soil is fed into the hearth at a constant speed through the feeding piece 101, the contaminated soil is preheated at the feed end of the hearth to remove water, and is reheated to be thermally desorbed after reaching the middle tail part of the hearth. The high temperature that the burning produced in the furnace body is through setting up and pressing from both sides the cover and heating contaminated soil in the outer layer of furnace. The hearth 2 slowly rolls at a constant speed to heat the polluted soil, and the organic pollutants are evaporated and form thermal desorption gas after being heated.
The thermal desorption gas sequentially enters the high-temperature cyclone dust collector 3 through the discharge end of the hearth and the gas outlet 202 of the soil discharge chamber 2, large granular solids in the thermal desorption gas are removed, and then the thermal desorption gas enters the high-temperature ceramic dust collector 4, and most of fine particles in the thermal desorption gas are removed. After the high-temperature separation of the solid and the gas is realized, the desorption gas enters the first gas distribution chamber 502 through the first gas inlet 501 and then enters the first condensation pipe for cooling, the high-concentration pollutant liquid and the low-concentration pollutant gas formed after cooling enter the first pollutant collection chamber 504, and the low-concentration pollutant gas enters the catalytic degradation device 6 through the first gas outlet 505. And the catalytic degradation device 6 is used for carrying out catalytic reduction oxidation degradation on organic pollutants in the gas output by the two-stage indirect condenser 5. The organic pollutant gas which is not completely degraded in the catalytic degradation device 6 enters a second gas distribution chamber 507 through a second gas inlet 508, then enters a second condensing pipe for cooling, the low-concentration pollutant liquid and the purified tail gas which are formed after cooling enter a second pollutant collecting chamber, and the purified tail gas enters an activated carbon adsorber 7 through a second gas outlet 509. And after removing the residual trace pollutants in the gas by the activated carbon absorber 7, discharging clean tail gas.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are intended to further illustrate the principles of the invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention, which is also intended to be covered by the appended claims. The scope of the invention is defined by the claims and their equivalents.
Claims (10)
1. The skid-mounted rapid emergency soil thermal desorption device is characterized by comprising a fixing frame (11), a high-temperature furnace (1), a soil discharge chamber (2), a high-temperature cyclone dust collector (3), a high-temperature ceramic dust collector (4), a catalytic degradation device (6), an active carbon adsorber (7) and a two-stage indirect condenser (5), wherein the high-temperature ceramic dust collector (4) and the catalytic degradation device (6) are communicated through the two-stage indirect condenser (5), and the catalytic degradation device (6) and the active carbon adsorber (7) are communicated through the two-stage indirect condenser (5); the high-temperature furnace (1), the soil discharge chamber (2), the high-temperature cyclone dust collector (3), the high-temperature ceramic dust collector (4), the two-stage indirect condenser (5) and the activated carbon adsorber (7) are all fixedly mounted on the fixing frame (11), and the catalytic degradation device (6) is arranged in the high-temperature furnace (1).
2. The skid-mounted rapid emergency soil thermal desorption device according to claim 1, wherein the high temperature furnace (1) comprises a furnace body (103), a hearth (102), an igniter (104), a support (105), a heat storage material layer (106) and a driving piece, the hearth (102) is mounted in an inner cavity of the furnace body (103) through the support (105), and the igniter (104) is arranged on the inner wall of the furnace body (1); the heat storage material layer (106) is arranged at the feed end of the hearth (102) and is filled between the inner wall of the furnace body (103) and the outer wall of the hearth (102); the discharge end of the hearth (102) is communicated with the soil discharge chamber (2); the driving piece is connected with the hearth (102) and used for driving the hearth (102) to rotate in the inner cavity of the furnace body (103), and the driving piece is arranged outside the furnace body (103).
3. The skid-mounted rapid emergency soil thermal desorption device according to claim 2, wherein the temperature in the high-temperature furnace (1) is 300-900 ℃; the temperature of the feed end of the hearth is 100-300 ℃.
4. The skid-mounted rapid emergency soil thermal desorption device according to claim 2, wherein the hearth (102) is arranged obliquely, the feeding end is higher than the discharging end, and the inclination angle is 5-10 degrees.
5. The skid-mounted rapid emergency soil thermal desorption device according to claim 2, further comprising a feeding member (101), wherein the feeding member (101) is communicated with the feeding end of the hearth, and the feeding member (101) is arranged outside the furnace body (103).
6. The skid-mounted rapid emergency soil thermal desorption device according to claim 1, wherein the two-stage indirect condenser (5) comprises a cooling chamber, a first air inlet (501), a first air distribution chamber (502), a first condenser pipe (503), a first pollutant collection chamber (504) and a first air outlet (505) which are communicated in sequence, and a second air inlet (508), a second air distribution chamber (507), a second condenser pipe (513), a second pollutant collection chamber and a second air outlet (509) which are communicated in sequence; the first condensation pipe (503) and the second condensation pipe (513) are both arranged in the cooling chamber; the first air inlet (501) is communicated with an outlet of the high-temperature ceramic dust remover (4), and the first air outlet (505) is communicated with an inlet of the catalytic degradation device (6); the second gas inlet (508) is communicated with the outlet of the catalytic degradation device (6), and the second gas outlet (509) is communicated with the inlet of the activated carbon adsorber (7).
7. The skid-mounted rapid emergency soil thermal desorption device according to claim 6, wherein the first condensation pipe (503) is positioned above the second condensation pipe (513).
8. The skid-mounted rapid emergency soil thermal desorption device according to claim 6, wherein the top end of the cooling chamber is provided with a cooling water outlet (512), and the bottom end of the cooling chamber is provided with a cooling water inlet (511); quick emergent soil thermal desorption device of sled dress formula still includes cooling tower (9), cooling tower (9) entry and cooling water export (511) intercommunication, cooling tower (9) export and cooling water entry (510) intercommunication.
9. The skid-mounted rapid emergency soil thermal desorption device according to claim 1, further comprising an air chamber (8) containing an induced draft fan and an exhaust chimney (10), wherein an inlet of the air chamber (8) is communicated with an outlet of the activated carbon adsorber (7), and an outlet of the air chamber (8) is communicated with the exhaust chimney (10).
10. The skid-mounted rapid emergency soil thermal desorption device according to claim 1, wherein an inlet is arranged on the side surface of the soil discharge chamber (2), a soil discharge hopper (201) is arranged at the bottom, an air outlet (202) is arranged at the upper part, the inlet of the soil discharge chamber (2) is communicated with the outlet of the high-temperature furnace (1), and the air outlet (202) of the soil discharge chamber (2) is communicated with the inlet of the high-temperature cyclone dust collector (3).
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