CN109731898B - Indirect thermal desorption device with irregular rotary drum for organic contaminated soil - Google Patents
Indirect thermal desorption device with irregular rotary drum for organic contaminated soil Download PDFInfo
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- CN109731898B CN109731898B CN201910046232.3A CN201910046232A CN109731898B CN 109731898 B CN109731898 B CN 109731898B CN 201910046232 A CN201910046232 A CN 201910046232A CN 109731898 B CN109731898 B CN 109731898B
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Abstract
The invention discloses an indirect thermal desorption device for organic contaminated soil with an irregular rotary drum, and belongs to the technical field of contaminated site soil remediation. The device comprises a raw soil feeding device, a rotary external heating type reactor and a clean soil discharging device. The invention provides an external heat rotary type organic contaminated soil thermal desorption device with heat transfer enhancement, which has larger treatment capacity and smaller treatment area under the condition of the same unit treatment energy consumption.
Description
Technical Field
The invention belongs to the technical field of remediation of contaminated site soil, is suitable for remediation of organic contaminated site soil, and particularly relates to an indirect thermal desorption device for organic contaminated soil, which is provided with an irregular rotary drum.
Background
The soil is a loose surface layer which has fertility and can grow plants on the surface of the land, when harmful substances discharged into the soil exceed the self-cleaning capacity of the soil, the composition, the structure and the function of the soil are changed, the activity of microorganisms is inhibited, the harmful substances or decomposition products thereof are gradually accumulated in the soil and absorbed by the human body through the soil → the plants → the human body or through the soil → water → the human body indirectly, and the soil pollution is generated to the extent of harming the health of the human body.
The current seriously polluted sites mainly comprise chemical plants, pesticide plants, smelting plants, gas stations, chemical storage tanks and the like, the pollutants of the sites mainly comprise organic pollution, and the sites can be divided into volatile organic compounds, semi-volatile organic compounds, persistent organic compounds, pesticides and the like according to the difference of the melting boiling points of the volatile organic compounds, the semi-volatile organic compounds, the persistent organic compounds and the like. The polluted soil restoration technology comprises incineration (cement kiln cooperative treatment), phytoremediation, bioremediation, chemical remediation, thermal desorption and the like, wherein the thermal desorption technology has the advantages of high treatment efficiency, short restoration period, movable device and the like, is widely applied to restoration of volatile/semi-volatile organic polluted sites, and is one of the main site restoration technologies, wherein the thermal desorption accounts for 20-30% in European and American site restoration cases, as shown by American EPA statistics.
The thermal desorption technology is that the excavated polluted soil is heated to a boiling point of a target pollutant through direct or indirect heating, and the pollutant is gasified and volatilized selectively by controlling the system temperature and the material retention time, so that the target pollutant is separated and removed from soil particles. The thermal desorption system mainly comprises two types, one type is a direct thermal desorption system, namely, hot flue gas is adopted to directly contact and heat soil to a specified temperature, the system has higher heat exchange efficiency, but the desorbed organic pollutants directly enter the flue gas, so the treatment capacity and the treatment difficulty of tail gas are higher, and the treatment cost is higher; the other type is an indirect thermal desorption system, namely, the soil and the hot flue gas are separated, the soil is indirectly heated through a thermal spiral or hollow blade reactor, the tail gas treatment capacity is small, and the treatment difficulty is low.
Patent CN201510207851.8 discloses an indirect thermal desorption device of soil with natural gas, diesel oil or biomass fuel, handles soil with the indirect thermal desorption device of two segmentation augers, and first section auger mainly carries out the drying to soil, and second section auger carries out thermal desorption to soil, and the thermal desorption temperature is 200 ~ 650 ℃. Patent CN201721127402.3 and CN201621177931.X disclose an indirect heat exchange thermal spiral reactor, some still use external heat type auger thermal desorption machine as its core component, because this kind of external heat type auger thermal desorption machine to the material that contains water, oil content is higher, often there is the bonding problem, the thermal efficiency is very low, because the restriction of the structure of the spiral that is heated itself, its unit handling capacity is lower, generally 1.5t/h, can only adopt the multimachine to connect in parallel when needing more handling capacity, the system is complicated, the area occupied is big, and because thermal desorption device usually needs to be portable, fast assembly, the parallel stage number is restricted, generally not more than two stages, single set of equipment handling capacity is not more than 3 t/h.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an indirect thermal desorption device for organic contaminated soil, which is provided with an irregular rotary drum.
The purpose of the invention can be realized by the following technical scheme:
an indirect thermal desorption device for organic contaminated soil with an irregular rotary drum comprises an original soil feeding device, a rotary external heating type reactor and a clean soil discharging device;
the raw soil feeding device comprises a raw soil feeding hole, a feeding airlock and a feeding screw conveyor which are sequentially connected; the clean soil discharging device comprises a discharging airlock and a clean soil discharging hole; the rotary external heating reactor comprises a rotary cylinder, a shell, a front end plate and a rear end plate, wherein the rotary cylinder, the shell, the front end plate and the rear end plate are sealed to form a heat transfer cavity;
the heat transfer cavity is divided into an outer cavity and an inner cavity by the front partition plate and the rear partition plate, one end of the outer cavity is communicated with the outer flue gas inlet of the barrel, and the other end of the outer cavity is communicated with the outer flue gas outlet of the barrel; one end of the inner cavity is communicated with the smoke inlet in the cylinder, and the other end of the inner cavity is communicated with the smoke outlet in the cylinder;
an inner tube bundle is arranged in the rotary cylinder body, and two ends of the inner tube bundle respectively penetrate through the rotary cylinder body and then are communicated with the inner cavity but are isolated from the soil to be treated; and the outer cylinder wall of the rotary cylinder body is an irregular cylinder with bulges on the surface.
The technical scheme of the invention is as follows: the protrusion is a polygonal surface or an arc surface or an elliptic arc surface or an s-shaped surface. In some preferred embodiments: the polygonal surface is an arc surface or an s-shaped surface.
In some more preferred embodiments: the cross section of the rotary cylinder body is at least provided with 8 bulges, and the width of the bottom edge of each bulge is more than or equal to 60 mm.
In some most preferred embodiments: the inner envelope and the outer envelope of the rotary cylinder are both round.
The technical scheme of the invention is as follows: the bulge is in a spiral shape taking the central shaft of the rotary cylinder as the center; preferably: the pitch of the protruding spiral is not more than the length of the rotary cylinder.
In some specific embodiments: the spiral rotary cylinder is characterized in that one end of the rotary cylinder is fixed, the other end of the rotary cylinder rotates, and the cylinder bulges to form a spiral shape, so that the external surface area of the cylinder can be obviously increased, and the heat exchange effect of the flue gas outside the cylinder and the cylinder is enhanced; a spiral concave channel can be formed on the inner surface of the cylinder body, so that the retention time of soil in the cylinder is prolonged, the soil can be retained for a longer time under the same cylinder body length, and the processing capacity in unit time is increased under the condition of not changing the floor area; or the length of the cylinder is shortened under the same processing capacity, so that the occupied area of the equipment is reduced under the same processing capacity per unit time.
The technical scheme of the invention is as follows: the front end of the rotary cylinder body is connected with the driving shaft and supported on the front carrier wheel assembly, the rotary cylinder body penetrates through the rear end plate and is supported on the rear carrier wheel assembly, and the driving shaft is driven to rotate through the driving device.
In some preferred embodiments: the drive shaft is sealed with the front end plate through the front cylinder body seal, and the rotary cylinder body is sealed with the rear end plate through the rear cylinder body seal.
The technical scheme of the invention is as follows: the inner tube bundle comprises at least one group of tube groups formed by connecting straight tubes and elbows, the straight tubes penetrate through the tube plates and then are fixed with the tube plates, and the elbows penetrate through the rotary cylinder and then are fixed with the rotary cylinder and communicated with the inner cavity.
The technical scheme of the invention is as follows: the inner tube bundle occupies no more than 30% of the effective space in the rotary cylinder body; preferably: the inner tube bundle occupies 12-20% of the effective space in the rotary cylinder body.
The technical scheme of the invention is as follows: the inner tube bundle is uniformly distributed along the circumference of the inner wall of the rotary cylinder, the distance between the wall surface of the straight tube and the inner wall surface of the rotary cylinder is 0.5-1.5 d, and d is the inner diameter of the straight tube.
The technical scheme of the invention is as follows: the inner tube bundles are uniformly distributed along the central shaft of the rotary cylinder, the distance between the wall surface of the straight tube at the outermost ring and the inner wall surface of the rotary cylinder is 0.5-0.85D, and D is the inner diameter of the rotary cylinder.
The technical scheme of the invention is as follows: the straight pipe is at least one of a spiral fluted pipe, a contracted fluted pipe or an inner finned pipe;
in some preferred embodiments: the volume of the heat transfer cavity is 60-90% of the volume of the inner cavity of the rotary cylinder;
in some more preferred embodiments: the center line of the rotary cylinder inclines 0-3 degrees to the discharge end relative to the center line of the shell.
The technical scheme of the invention is as follows: the inner cavity of the rotary cylinder body is provided with a spiral material guide plate and/or a material lifting plate;
in some specific embodiments: the drive shaft is hollow structure, and feeding screw conveyer installs in the drive shaft, and feeding screw conveyer's discharge end stretches into gyration barrel 15~40 mm.
In some specific embodiments: the rotary cylinder is made of heat-resistant stainless steel materials, and the outer shell is of a refractory fiber structure;
in some specific embodiments: the inner wall of the shell is provided with a heat insulation layer.
In some specific embodiments: the driving device comprises a driving gear connected with the driving shaft and a driving motor matched with the driving gear.
In some specific embodiments: the raw soil feeding device and the clean soil discharging device are communicated with the rotary cylinder, and a thermal desorption gas outlet is arranged on the clean soil discharging device side of the rotary cylinder.
The technical scheme of the invention is as follows: the temperature of the flue gas inlet in the cylinder is 100-600 ℃.
The technical scheme of the invention is as follows: the temperature of the flue gas inlet outside the cylinder is 100-600 ℃.
The technical scheme of the invention is as follows: the temperature of the flue gas inlet outside the bobbin is 50-100 ℃ higher than that of the flue gas inlet inside the bobbin.
The technical scheme of the invention is as follows: the motor is used for frequency conversion and speed regulation, and the speed regulation range is 0.1-3 r/min.
The technical scheme of the invention is as follows: the front rolling ring is positioned at the head part of the rotary cylinder body and outside the front end plate, and the rear rolling ring is positioned at the tail part of the rotary cylinder body and outside the rear end plate.
The technical scheme of the invention is as follows: the tail cover is arranged at the tail end of the rotary cylinder body, communicated with the rotary cylinder body and provided with a rotary sealing device.
The technical scheme of the invention is as follows: the strengthening rib and the manhole are located on the shell, the strengthening rib plays a role in strengthening the structure, and the manhole is used for overhauling. The rotary cylinder connecting section is positioned between the front cylinder seal and the front rolling ring.
In other embodiments: the inner wall of the rotary cylinder body is of a structure matched with the outer wall of the rotary cylinder body or the sunken part of the inner wall of the rotary cylinder body is of a solid structure.
The invention has the beneficial effects that:
the invention provides an indirect thermal desorption device for organic contaminated soil, which is provided with an irregular rotary drum and has larger treatment capacity under the condition of the same unit treatment energy consumption and equipment floor area.
Drawings
Fig. 1 is a front view of a thermal desorption apparatus;
fig. 2 is a left side view of the thermal desorption apparatus;
fig. 3 is a top view of the thermal desorption apparatus;
fig. 4 is a full sectional view of the thermal desorption apparatus;
fig. 5a is a right side view of the thermal desorption apparatus;
fig. 5b is a longitudinal sectional view of the thermal desorption apparatus;
fig. 6 is a three-dimensional view of a thermal desorption device;
fig. 7 is a three-dimensional view of an irregular drum of a thermal desorption device.
Fig. 8 is a triangular-faced helical spin cylinder wherein: fig. 8(a) is a front view of a spiral rotary cylinder having a triangular projection, and fig. 8(b) is a sectional view taken along line a-a of fig. 8 (a).
Fig. 9 is a semi-circular arc-shaped helical rotary cylinder, wherein: fig. 9(a) is a front view of a spiral rotary cylinder having a semicircular convex surface, and fig. 9(b) is a cross-sectional view taken along line a-a of fig. 9 (a).
Fig. 10 is an s-shaped helical rotary cylinder in which: fig. 10(a) is a front view of a spiral rotary cylinder having s-shaped protrusions, and fig. 10(b) is a sectional view taken along line a-a of fig. 10 (a).
Wherein: 1-raw soil feeding hole, 2-feeding airlock, 3-feeding screw conveyor, 4-driving device, 501-flue gas outlet, 502-flue gas inlet, 6-front idler assembly, 7-rear idler assembly, 8-heat insulation layer, 9-thermal desorption gas outlet, 10-tail cover, 11-shell, 12-discharging airlock, 13-clean soil discharging hole, 14-driving gear, 15-driving motor, 16-front rolling ring, 17-rear rolling ring, 18-rotary cylinder, 19-reinforcing rib, 20-front cylinder seal, 21-rear cylinder seal, 22-front rolling ring, 23-rear rolling ring, 24-manhole, 25-front end plate, 26-rear end plate, 27-driving shaft, 28-heat transfer cavity, 101-raw soil feeding device, 102-rotary external heat type reactor, 103-clean soil discharging device.
Detailed Description
The invention is further illustrated by the following examples, without limiting the scope of the invention:
an indirect thermal desorption device for organic contaminated soil with an irregular rotary drum comprises an original soil feeding device (101), a rotary external heating type reactor (102) and a clean soil discharging device (103);
the raw soil feeding device (101) comprises a raw soil feeding hole (1), a feeding airlock (2) and a feeding screw conveyor (3) which are sequentially connected; the clean soil discharging device (103) comprises a discharging air lock (12) and a clean soil discharging hole (13); the rotary external heating type reactor (102) comprises a rotary cylinder (18), a shell (11), a front end plate (25) and a rear end plate (26), the rotary cylinder (18), the shell (11), the front end plate (25) and the rear end plate (26) are sealed to form a heat transfer cavity (28), and a flue gas inlet (501) and a flue gas outlet (502) are positioned at two ends of the heat transfer cavity (28);
the contact part of the rotary cylinder body (18) and the flue gas outside the cylinder is an irregular cylinder, and the irregular curved surface of the irregular cylinder is a nonstandard circular rotary body formed by mutually connecting an s-shaped surface, a triangular surface, a semi-circular surface or other shapes.
The raw soil feeding device (101) and the clean soil discharging device (103) are communicated with the rotary cylinder body (18), and a thermal desorption gas outlet (9) is arranged on the clean soil discharging device (103) side of the rotary cylinder body (18).
The front end of the rotary cylinder (18) is connected with a driving shaft (27) and supported on the front carrier wheel assembly (6), the rotary cylinder (18) penetrates through the rear end plate (16) and is supported on the rear carrier wheel assembly (7), and the driving shaft (27) is driven to rotate by the driving device (4); preferably: the drive shaft (27) is sealed to the front end plate (28) by a front cylinder seal (20), and the rotary cylinder (18) is sealed to the rear end plate (26) by a rear cylinder seal (21). The driving device (4) comprises a driving gear (14) connected with the driving shaft (27) and a driving motor (15) matched with the driving gear (14). The central line of the rotary cylinder (18) inclines 0-3 degrees towards the discharge end relative to the central line of the shell (11). The volume of the heat transfer cavity (28) is 60-90% of the volume of the inner cavity of the rotary cylinder (18).
The inner cavity of the rotary cylinder body (18) is provided with a spiral material guide plate and/or a material lifting plate. The driving shaft (27) is of a hollow structure, the feeding screw conveyor (3) is installed in the driving shaft (27), and the discharging end of the feeding screw conveyor (3) extends into the rotary cylinder (18) by 15-40 mm. The rotary cylinder (18) is made of heat-resistant stainless steel materials, and the outer shell (11) is of a fire-resistant fiber structure. An inert heat carrying ball is placed in the rotary cylinder (18), the inert heat carrying ball is made of at least one of a steel ball, an alloy ball and a ceramic ball and is in the form of a solid ball or a hollow ball, a heat carrying medium is filled in the hollow ball, and the heat carrying medium is molten salt. And a heat insulation layer (8) is arranged on the inner wall of the shell (11).
The following embodiment is based on an irregular rotary drum type thermal desorption device with an S-shaped curved surface, and tests are carried out aiming at different pollutants.
Example 1:
the processing object is as follows:
moisture content of 20 percent, and volatile organic polluted soil of toluene and xylene
Processing parameters:
the temperature of a flue gas inlet (502) is 700 ℃, the soil retention time is 30min, the temperature of a flue gas outlet (501) is 260 ℃, the treatment capacity is 3.6t/h, the initial average concentration of toluene and dimethylbenzene is 500mg/kg, the average concentration after treatment is lower than 5.0mg/kg, the removal rate reaches 99 percent, and 40 Nm/ton of soil is consumed by average heating3H natural gas;
the temperature of a flue gas inlet (502) is 750 ℃, when the soil stays for 30min, the temperature of a flue gas outlet (501) is 300 ℃, the treatment capacity is 3.6t/h, the initial average concentration of toluene and dimethylbenzene is 500mg/kg, the average concentration after treatment is lower than 1.0mg/kg, the removal rate reaches 99.9 percent, and the average heating consumes 45 Nm/ton of soil3H natural gas.
Example 2:
the processing object is as follows:
humidity rate of 20%, hexachloro cyclohexane and DDTs pesticide semi-volatile organic contaminated soil
Processing parameters:
the temperature of the flue gas inlet (502) is 700 ℃, the temperature of the flue gas outlet (501) is 260 ℃ when the soil stays for 30minThe rational amount is 3.6/h, the initial average concentration of the hexachloro cyclohexane and DDTs is 300mg/kg, the average concentration after treatment is lower than 6.0mg/kg, the removal rate reaches 98 percent, and the average heating consumption of 45 Nm/ton soil3H natural gas;
the temperature of a flue gas inlet (502) is 750 ℃, when the soil stays for 30min, the temperature of a flue gas outlet (501) is 300 ℃, the treatment capacity is 3.6t/h, the initial average concentration of hexachloro cyclohexane and DDTs is 300mg/kg, the average concentration after treatment is lower than 3.0mg/kg, the removal rate reaches 99%, and 50 Nm/ton of soil is consumed by average heating3H natural gas;
example 3:
the processing object is as follows:
soil with moisture content of 20% and difficult volatile organic pollution of benzanthracene and benzopyrene polycyclic aromatic hydrocarbons
Processing parameters:
the temperature of a flue gas inlet (502) is 700 ℃, when the soil stays for 30min, the temperature of a flue gas outlet (501) is 260 ℃, the treatment capacity is 3.6t/h, the initial average concentration of the benzanthracene and the benzopyrene is 100mg/kg, the average concentration after treatment is lower than 2.0mg/kg, the removal rate reaches 98%, and 50 Nm/ton of soil is consumed by average heating3H natural gas;
the temperature of a flue gas inlet (502) is 750 ℃, when the soil stays for 30min, the temperature of a flue gas outlet (501) is 300 ℃, the treatment capacity is 3.6t/h, the initial average concentration of the benzanthracene and the benzopyrene is 100mg/kg, the average concentration after treatment is lower than 5.0mg/kg, the removal rate reaches 95%, and the average heating consumes 55 Nm/ton of soil3H natural gas.
Example 4:
the conditions were the same as those in example 1 except that the S-shaped curved irregular rotary drum type thermal desorption apparatus was replaced with a semicircular curved irregular rotary drum type thermal desorption apparatus.
Example 5:
the conditions were the same as those in example 1 except that the irregular drum-type thermal desorption apparatus with the S-shaped curved surface was replaced with an irregular drum-type thermal desorption apparatus with a triangular curved surface.
Examples 6 to 8
The pollutant treatment conditions and the devices used were as follows:
an external heat rotary type organic contaminated soil thermal desorption device with heat transfer enhancement comprises an original soil feeding device, a rotary external heat type reactor and a clean soil discharging device;
the raw soil feeding device comprises a raw soil feeding hole, a feeding airlock and a feeding screw conveyor which are sequentially connected; the clean soil discharging device comprises a discharging airlock and a clean soil discharging hole; the rotary external heating reactor comprises a rotary cylinder, a shell, a front end plate and a rear end plate, wherein the rotary cylinder, the shell, the front end plate and the rear end plate are sealed to form a heat transfer cavity;
the heat transfer cavity is divided into an outer cavity and an inner cavity by the front partition plate and the rear partition plate, one end of the outer cavity is communicated with the outer flue gas inlet of the barrel, and the other end of the outer cavity is communicated with the outer flue gas outlet of the barrel; one end of the inner cavity is communicated with the smoke inlet in the cylinder, and the other end of the inner cavity is communicated with the smoke outlet in the cylinder;
an inner tube bundle is arranged in the rotary cylinder body, and two ends of the inner tube bundle respectively penetrate through the rotary cylinder body and then are communicated with the inner cavity but are isolated from the soil to be treated; and the outer cylinder wall of the rotary cylinder body is an irregular cylinder with bulges on the surface.
The protrusion is a polygonal surface or an arc surface or an elliptic arc surface or an s-shaped surface. In some preferred embodiments: the polygonal surface is an arc surface or an s-shaped surface.
The cross section of the rotary cylinder body is at least provided with 8 bulges, and the width of the bottom edge of each bulge is more than or equal to 60 mm.
The inner envelope and the outer envelope of the rotary cylinder are both round.
The bulge is in a spiral shape taking the central shaft of the rotary cylinder as the center; preferably: the pitch of the protruding spiral is not more than the length of the rotary cylinder.
The spiral rotary cylinder is characterized in that one end of the rotary cylinder is fixed, the other end of the rotary cylinder rotates, and the cylinder bulges to form a spiral shape, so that the external surface area of the cylinder can be obviously increased, and the heat exchange effect of the flue gas outside the cylinder and the cylinder is enhanced; a spiral concave channel can be formed on the inner surface of the cylinder body, so that the retention time of soil in the cylinder is prolonged, the soil can be retained for a longer time under the same cylinder body length, and the processing capacity in unit time is increased under the condition of not changing the floor area; or the length of the cylinder is shortened under the same processing capacity, so that the occupied area of the equipment is reduced under the same processing capacity per unit time.
The front end of the rotary cylinder body is connected with the driving shaft and supported on the front carrier wheel assembly, the rotary cylinder body penetrates through the rear end plate and is supported on the rear carrier wheel assembly, and the driving shaft is driven to rotate through the driving device.
The drive shaft is sealed with the front end plate through the front cylinder body seal, and the rotary cylinder body is sealed with the rear end plate through the rear cylinder body seal.
The inner tube bundle comprises at least one group of tube groups formed by connecting straight tubes and elbows, the straight tubes penetrate through the tube plates and then are fixed with the tube plates, and the elbows penetrate through the rotary cylinder and then are fixed with the rotary cylinder and communicated with the inner cavity.
The inner tube bundle occupies no more than 30% of the effective space in the rotary cylinder body; preferably: the inner tube bundle occupies 12-20% of the effective space in the rotary cylinder body.
The inner tube bundle is uniformly distributed along the circumference of the inner wall of the rotary cylinder, the distance between the wall surface of the straight tube and the inner wall surface of the rotary cylinder is 0.5-1.5 d, and d is the inner diameter of the straight tube.
Or the inner tube bundles are uniformly distributed along the central shaft of the rotary cylinder, the distance between the wall surface of the straight tube at the outermost circle and the inner wall surface of the rotary cylinder is 0.5-0.85D, and D is the inner diameter of the rotary cylinder.
The straight pipe is at least one of a spiral fluted pipe, a contracted fluted pipe or an inner finned pipe;
the volume of the heat transfer cavity is 60-90% of the volume of the inner cavity of the rotary cylinder;
the center line of the rotary cylinder inclines 0-3 degrees to the discharge end relative to the center line of the shell.
The inner cavity of the rotary cylinder body is provided with a spiral material guide plate and/or a material lifting plate; the drive shaft is hollow structure, and feeding screw conveyer installs in the drive shaft, and feeding screw conveyer's discharge end stretches into gyration barrel 15~40 mm.
The rotary cylinder is made of heat-resistant stainless steel materials, and the outer shell is of a refractory fiber structure; the inner wall of the shell is provided with a heat insulation layer. The driving device comprises a driving gear connected with the driving shaft and a driving motor matched with the driving gear.
In some specific embodiments: the raw soil feeding device and the clean soil discharging device are communicated with the rotary cylinder, and a thermal desorption gas outlet is arranged on the clean soil discharging device side of the rotary cylinder.
The technical scheme of the invention is as follows: the motor is used for frequency conversion and speed regulation, and the speed regulation range is 0.1-3 r/min.
The technical scheme of the invention is as follows: the front rolling ring is positioned at the head part of the rotary cylinder body and outside the front end plate, and the rear rolling ring is positioned at the tail part of the rotary cylinder body and outside the rear end plate.
The technical scheme of the invention is as follows: the tail cover is arranged at the tail end of the rotary cylinder body, communicated with the rotary cylinder body and provided with a rotary sealing device.
The technical scheme of the invention is as follows: the strengthening rib and the manhole are located on the shell, the strengthening rib plays a role in strengthening the structure, and the manhole is used for overhauling. The rotary cylinder connecting section is positioned between the front cylinder seal and the front rolling ring.
Examples 6 to 8 parameters involved in the devices
Examples 6 to 8 treatment objects and conditions:
moisture content of 20 percent, and volatile organic polluted soil of toluene and xylene
Processing parameters:
the temperature of a smoke inlet in the cylinder is 650 ℃, the temperature of a smoke inlet outside the cylinder is 700 ℃, the soil retention time is 30min, the temperature of a smoke outlet in the cylinder is 220 ℃, the temperature of a smoke outlet outside the cylinder is 260 ℃, the treatment capacity is 7.4t/h, the initial average concentration of toluene and xylene is 500mg/kg, the average concentration after treatment is lower than 5.0mg/kg, the removal rate reaches 99 percent, and the average heating consumes 40 Nm/ton of soil3H natural gas;
the temperature of the flue gas inlet in the cylinder is 700 ℃, the temperature of the flue gas inlet outside the cylinder is 750 ℃, the temperature of the flue gas outlet in the cylinder is 260 ℃ when the soil stays for 30min, and the temperature of the flue gas outlet in the cylinder isThe outlet temperature of the external flue gas is 300 ℃, the treatment capacity is 7.4t/h, the initial average concentration of toluene and xylene is 500mg/kg, the average concentration after treatment is lower than 1.0mg/kg, the removal rate reaches 99.9 percent, and the average heating consumes 45 Nm/ton of soil3H natural gas.
Comparative example 1:
the conditions were the same as in example 1 except that the irregular drum-type thermal desorption apparatus having an S-shaped curved surface was replaced with a smooth regular cylindrical drum-type thermal desorption apparatus.
And (3) performance detection:
treatment effects of examples 1 to 8 and comparative example 1
| Item | Throughput (t/h) | Floor area (m)2) | Energy consumption per unit of treatment |
| Example 1 | 3.6 | 50 | Are identical to each other |
| Example 2 | 3.6 | 50 | Are identical to each other |
| Example 3 | 3.6 | 50 | Are identical to each other |
| Example 4 | 3.6 | 50 | Are identical to each other |
| Example 5 | 3.6 | 50 | Are identical to each other |
| Example 6 | 7.4 | 50 | Are identical to each other |
| Example 7 | 7.4 | 50 | Are identical to each other |
| Example 8 | 7.4 | 50 | Are identical to each other |
| Comparative example 1 | 2.1 | 50 | Are identical to each other |
Claims (12)
1. The utility model provides a take indirect thermal desorption device of organic contaminated soil of non-regular rotary drum which characterized in that:
the device comprises a raw soil feeding device (101), a rotary external heating type reactor (102) and a clean soil discharging device (103);
the raw soil feeding device (101) comprises a raw soil feeding hole (1), a feeding airlock (2) and a feeding screw conveyor (3) which are sequentially connected; the clean soil discharging device (103) comprises a discharging air lock (12) and a clean soil discharging hole (13); the rotary external heating type reactor (102) comprises a rotary cylinder (18), a shell (11), a front end plate (25) and a rear end plate (26), the rotary cylinder (18), the shell (11), the front end plate (25) and the rear end plate (26) are sealed to form a heat transfer cavity (28), and a flue gas inlet (501) and a flue gas outlet (502) are positioned at two ends of the heat transfer cavity (28);
the contact part of the rotary cylinder body (18) and the flue gas outside the cylinder is an irregular cylinder, and the outer cylinder wall of the irregular cylinder is an irregular cylinder with bulges on the surface; the protrusions are polygonal surfaces, arc surfaces, elliptic arc surfaces or s-shaped surfaces, and the inner envelope and the outer envelope of the rotary cylinder (18) are both circles;
the irregular cylinder is a spiral rotary cylinder, one end of the rotary cylinder is fixed, the other end of the rotary cylinder rotates, the cylinder is protruded to form a spiral shape, and a spiral concave channel is formed on the inner surface of the cylinder;
at least 8 bulges are arranged on the cross section of the rotary cylinder (18), and the width of the bottom edge of each bulge is more than or equal to 60 mm;
the bulge is in a spiral shape taking the central shaft of the rotary cylinder (18) as the center;
an inner tube bundle is arranged in the rotary cylinder body, and two ends of the inner tube bundle respectively penetrate through the rotary cylinder body and then are communicated with the inner cavity but are isolated from the soil to be treated; the inner tube bundle comprises at least one group of tube groups formed by connecting a straight tube and an elbow, the straight tube penetrates through the tube plate and then is fixed with the tube plate, and the elbow penetrates through the rotary cylinder and then is fixed with the rotary cylinder and is communicated with the inner cavity; the inner tube bundle occupies 12-20% of the effective space in the rotary cylinder body;
the inner tube bundles are uniformly distributed along the circumference of the inner wall of the rotary cylinder, the distance between the wall surface of the straight tube and the inner wall surface of the rotary cylinder is 0.5-1.5 d, wherein d is the inner diameter of the straight tube;
or the inner tube bundles are uniformly distributed along the central shaft of the rotary cylinder, the distance between the wall surface of the straight tube at the outermost circle and the inner wall surface of the rotary cylinder is 0.5-0.85D, and D is the inner diameter of the rotary cylinder.
2. The indirect thermal desorption device for organic contaminated soil with irregular rotating cylinders as claimed in claim 1, wherein: the front end of the rotary cylinder (18) is connected with a driving shaft (27) and supported on the front carrier wheel assembly (6), the rotary cylinder (18) penetrates through the rear end plate (16) and is supported on the rear carrier wheel assembly (7), and the driving shaft (27) is driven to rotate by the driving device (4).
3. The indirect thermal desorption device for organic contaminated soil with irregular rotating cylinders as claimed in claim 2, wherein: the drive shaft (27) is sealed to the front end plate (25) by a front cylinder seal (20), and the rotary cylinder (18) is sealed to the rear end plate (26) by a rear cylinder seal (21).
4. The indirect thermal desorption device for organic contaminated soil with irregular rotating cylinders as claimed in claim 1, wherein: the pitch of the convex helix is not more than the length of the rotary cylinder (18).
5. The indirect thermal desorption device for organic contaminated soil with irregular rotating cylinders as claimed in claim 1, wherein: the volume of the heat transfer cavity (28) is 60-90% of the volume of the inner cavity of the rotary cylinder (18); and the central line of the rotary cylinder (18) inclines 0-3 degrees towards the discharge end relative to the central line of the shell (11).
6. The indirect thermal desorption device for organic contaminated soil with irregular rotating cylinders as claimed in claim 1, wherein: the inner cavity of the rotary cylinder body (18) is provided with a spiral material guide plate and/or a material lifting plate.
7. The indirect thermal desorption device for organic contaminated soil with irregular rotating cylinders as claimed in claim 2, wherein: the driving shaft (27) is of a hollow structure, the feeding screw conveyor (3) is installed in the driving shaft (27), and the discharging end of the feeding screw conveyor (3) extends into the rotary cylinder (18) by 15-40 mm.
8. The indirect thermal desorption device for organic contaminated soil with irregular rotating cylinders as claimed in claim 1, wherein: the rotary cylinder (18) is made of heat-resistant stainless steel materials, and the outer shell (11) is of a fire-resistant fiber structure.
9. The indirect thermal desorption device for organic contaminated soil with irregular rotating cylinders as claimed in claim 2, wherein: the driving device (4) comprises a driving gear (14) connected with the driving shaft (27) and a driving motor (15) matched with the driving gear (14).
10. The indirect thermal desorption device for organic contaminated soil with irregular rotating cylinders as claimed in claim 1, wherein: an inert heat carrying ball is placed in the rotary cylinder (18), the inert heat carrying ball is made of at least one of a steel ball, an alloy ball and a ceramic ball and is in the form of a solid ball or a hollow ball, a heat carrying medium is filled in the hollow ball, and the heat carrying medium is molten salt.
11. The indirect thermal desorption device for organic contaminated soil with irregular rotating cylinders as claimed in claim 1, wherein: and a heat insulation layer (8) is arranged on the inner wall of the shell (11).
12. The indirect thermal desorption device for organic contaminated soil with irregular rotating cylinders as claimed in claim 1, wherein: the raw soil feeding device (101) and the clean soil discharging device (103) are communicated with the rotary cylinder body (18), and a thermal desorption gas outlet (9) is arranged on the clean soil discharging device (103) side of the rotary cylinder body (18).
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| CN201910046232.3A CN109731898B (en) | 2019-01-18 | 2019-01-18 | Indirect thermal desorption device with irregular rotary drum for organic contaminated soil |
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| WO2020147658A1 (en) * | 2019-01-18 | 2020-07-23 | 南京工业大学 | Externally heated rotary-type organic contaminated soil thermal desorption device with heat transfer augmentation |
| CN110014035A (en) * | 2019-05-22 | 2019-07-16 | 孙晓凡 | A kind of thermal desorption soil remediation equipment |
| CN111889495B (en) * | 2020-07-14 | 2022-03-01 | 诸暨华匠工程设计咨询有限公司 | Soil remediation thermal desorption equipment and process thereof |
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| CN203484405U (en) * | 2013-09-25 | 2014-03-19 | 浙江大学 | Multi-heat source shaftless interval-heating thermal desorption device for repairing soil polluted by organic matter |
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| US5305696A (en) * | 1992-10-05 | 1994-04-26 | Mendenhall Robert Lamar | Process and system for treating contaminated particulate soil compositions |
| CN203484405U (en) * | 2013-09-25 | 2014-03-19 | 浙江大学 | Multi-heat source shaftless interval-heating thermal desorption device for repairing soil polluted by organic matter |
| CN205436601U (en) * | 2016-04-08 | 2016-08-10 | 山东金孚环境工程有限公司 | Restore thermal desorption device that pollutes soil |
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