CN113182342A

CN113182342A - Thermal desorption prosthetic devices who pollutes soil

Info

Publication number: CN113182342A
Application number: CN202110547864.5A
Authority: CN
Inventors: 宋磊; 王晔辉; 周强
Original assignee: Shanxi Eighth Construction Group Co Ltd
Current assignee: Shanxi Eighth Construction Group Co Ltd
Priority date: 2021-05-19
Filing date: 2021-05-19
Publication date: 2021-07-30
Anticipated expiration: 2041-05-19
Also published as: CN113182342B

Abstract

The invention relates to the technical field of soil treatment, in particular to a thermal desorption remediation device for contaminated soil; the device comprises a processing device, a material guide pipe and a spiral conveyer which are sequentially connected together from top to bottom and are communicated with an internal cavity, wherein the spiral conveyer and the material guide pipe are positioned on one side of the top of the spiral conveyer; the middle of the inner bottom of the processing device is provided with a fixed pipe with the same inner diameter as the material guide pipe, the outer side of the fixed pipe is sleeved with a moving pipe, the inside of the processing device is also vertically provided with a transmission column, and the tail end of the transmission column extends into the fixed pipe and is provided with a helical blade on the outer wall. According to the invention, the retention time of soil between the moving pipe and the fixed pipe is prolonged by the guide plate and the buffer strip, the heating efficiency is improved, the soil enters the spiral conveyor through the material guide pipe after being treated and is conveyed, the soil is contacted with the air inlet with reverse convection in the conveying process, the thermal desorption is carried out for the second time, the contact time between the soil and hot air is prolonged, and the thermal desorption efficiency is improved after two times of thermal desorption.

Description

Thermal desorption prosthetic devices who pollutes soil

Technical Field

The invention relates to the technical field of soil treatment, in particular to a thermal desorption remediation device for contaminated soil.

Background

The soil remediation is a technical measure for restoring the normal function of polluted soil, in the soil remediation industry, the existing soil remediation technology reaches more than one hundred, the common technology also has more than ten, and can be roughly divided into three methods of physics, chemistry and biology, and thermal desorption refers to a process of heating and volatilizing organic pollutants, metal mercury and the like in the polluted soil to separate the organic pollutants, the metal mercury and the like through a direct or indirect heat exchange mode, and effectively collecting and treating the volatilized pollutants. Thermal desorption is used as a non-combustion technology, the pollutant treatment range is wide, equipment is movable, the repaired soil can be reused, particularly, the chlorine-containing organic matters can be treated in a non-oxidative combustion mode, dioxin can be prevented from being generated, and the method is widely used for repairing the soil polluted by the organic pollutants.

At present, the existing soil thermal desorption repair device has the following problems: the contact time with the soil is short, the thermal desorption effect is influenced, and meanwhile, the soil is easy to agglomerate, so that the heating speed is low, and the heat energy waste is caused. For this reason, a new scheme needs to be designed to give improvements.

Disclosure of Invention

The invention provides a thermal desorption remediation device for contaminated soil, which aims to solve the problems that the existing remediation device is short in contact time with soil, influences the thermal desorption effect, is easy to agglomerate, is slow in heating speed and causes heat energy waste, and meets the actual use requirement.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a thermal desorption remediation device for contaminated soil comprises a treatment device, a material guide pipe and a spiral conveyor which are sequentially connected together from top to bottom and are communicated with an internal cavity, wherein the spiral conveyor and the material guide pipe are positioned on one side of the top of the spiral conveyor; a fixed pipe with the same inner diameter as the material guide pipe is installed in the middle of the inner bottom of the processing device, a material guide hole is formed in the side wall of the lower end of the fixed pipe, a moving pipe is sleeved outside the fixed pipe, a transmission column is vertically installed inside the processing device, the tail end of the transmission column extends into the fixed pipe, a helical blade is installed on the outer wall of the transmission column, the fixed pipe and the moving pipe are coaxial, a plurality of connecting rods distributed in an annular mode are installed on the surface of the transmission column and fixedly connected with the inner wall of the moving pipe through the connecting rods, a motor is installed on the top surface of the processing device, and the power output end of the motor is connected with the transmission column through a coupler;

two feed hoppers are mounted on the outer wall of the treatment device, crushing wheels are respectively arranged in the treatment device and positioned at two sides of the moving pipe, and the crushing wheels are arranged below the feed hoppers;

the air guide ring is arranged in the processing device above the moving pipe, the upper end of the outer wall of the processing device is provided with an annular air guide pipe communicated with the air guide ring, the surface of the air guide pipe is connected with a first air pipe, the tail end of the first air pipe is connected with one end of the top of the spiral conveyor, the other end of the top of the spiral conveyor is also provided with a second air pipe, and the other end of the second air pipe is used for connecting an air heater.

The working principle is as follows: throw into processing apparatus inside with soil through the feeder hopper, carry out first breakage through broken wheel, soil after the breakage reentrants in the guide hole, and shift up under pivoted helical blade drives, move up to helical blade upper end (decide tub upper end) to all around falling down on the soil, soil passes decides the pipe and moves the space between the pipe, and the steam contact that blows off with the venthole, soil is handled and is carried in entering into screw conveyer through the guide pipe after accomplishing, contact with the reverse admission of convection current among the transportation process, carry out the thermal desorption of second time, improve the contact time between soil and the hot-blast, through twice thermal desorption, improve the efficiency of thermal desorption.

Further, install the buffering strip on deciding the outer wall of pipe, the buffering strip is the heliciform and extends along deciding the both ends of pipe, and the cross-section semicircular structure and the diameter of heliciform buffering strip from top to bottom increase gradually, and the buffering strip is hollow structure.

Further, a plurality of inlet port that is annular equidistance and distributes is seted up to the tip of moving the pipe, the inlet port vertically runs through moving the pipe, installs a plurality of longitudinal arrangement and equidistance distribution's deflector on moving the inner wall of pipe, has seted up the venthole on being located the moving pipe inner wall of the top of deflector, the inner wall of inlet port just is located venthole department and installs the guide block.

Compared with the prior art, the invention has the following beneficial effects:

according to the invention, soil is put into the treatment device through the feed hopper, primary crushing is carried out through the crushing wheel, the crushed soil is pushed by the material pushing plate to enter the material guide holes and moves upwards under the driving of the rotating helical blades, the soil moves upwards to the upper ends of the helical blades (the upper ends of the fixed pipes) and then falls down to the periphery, the soil passes through the space between the fixed pipes and the moving pipes and is contacted with hot air blown out of the air outlet holes, the residence time of the soil between the moving pipes and the fixed pipes is prolonged by the guide plates and the buffer strips, the heating efficiency is improved, the soil after treatment is conveyed into the spiral conveyor through the material guide pipes, the soil is contacted with air inlet in the reverse direction of convection in the conveying process, secondary thermal desorption is carried out, the contact time between the soil and the hot air is prolonged, and the thermal desorption efficiency is improved through twice thermal desorption.

Drawings

Fig. 1 is a structural diagram of a thermal desorption remediation device for contaminated soil according to the present invention;

FIG. 2 is a view showing an internal structure of the treating apparatus according to the present invention;

FIG. 3 is a front view of the burette of the present invention;

FIG. 4 is a top view of a tube according to the present invention;

fig. 5 is a partial structural view of the screw conveyor according to the present invention.

The figures are labeled as follows:

1-screw conveyer, 2-processing device, 3-guide pipe, 4-feed hopper, 5-air guide pipe, 6-motor, 7-air guide pipe I, 8-filter plate, 9-air guide pipe II, 10-connecting rod, 11-air guide ring, 12-moving pipe, 13-transmission column, 14-guide plate, 15-crushing wheel, 16-supporting rod, 17-material pushing plate, 18-guide hole, 19-air inlet hole, 20-helical blade, 21-air outlet hole, 22-guide block, 23-buffer strip, 24-fixed pipe, 25-electric material discharging plate, 26-connecting block and 27-air nozzle.

Detailed Description

The present invention is further illustrated by the following specific examples.

Examples

As shown in fig. 1, a thermal desorption remediation device for contaminated soil comprises a treatment device 2, a material guide pipe 3 and a screw conveyor 1, wherein the treatment device, the material guide pipe 3 and the screw conveyor 1 are sequentially connected together from top to bottom, and the inner cavities of the treatment device and the screw conveyor are communicated, and the screw conveyor 1 and the material guide pipe 3 are positioned on one side of the top of the screw conveyor 1; as shown in fig. 2, a fixed pipe 24 having the same inner diameter as the material guiding pipe 3 is installed in the middle of the inner bottom of the processing device 2, a material guiding hole 18 is formed in the side wall of the lower end of the fixed pipe 24, a moving pipe 12 is sleeved outside the fixed pipe 24, a transmission column 13 is vertically installed inside the processing device 2, the tail end of the transmission column 13 extends into the fixed pipe 24, a helical blade 20 is installed on the outer wall of the transmission column 13, the fixed pipe 24 and the moving pipe 12 are coaxial, a plurality of connecting rods 10 distributed in an annular shape are installed on the surface of the transmission column 13, and are fixedly connected with the inner wall of the moving pipe 12 through the connecting rods 10, a motor 6 is installed on the top surface of the processing device 2, and the power output end of the motor 6 is connected with the transmission column 13 by using a coupler;

two feed hoppers 4 are mounted on the outer wall of the processing device 2, crushing wheels 15 are respectively arranged inside the processing device 2 and on two sides of the moving pipe 12, and the crushing wheels 15 are arranged below the feed hoppers 4;

be located the inside of managing 12 top processing apparatus 2 of pipe and be provided with air guide ring 11, the annular air duct 5 that is linked together with air guide ring 11 is installed to processing apparatus 2's outer wall upper end, and air duct 5 surface connection has trachea one 7, the end of trachea one 7 is connected with screw conveyer 1's top one end, screw conveyer 1's the top other end still installs trachea two 9, the other end of trachea two 9 is used for connecting the air heater. Carry out twice crushing, promotion, whereabouts to soil through processing apparatus 2, fully contact with hot-blast in the in-process of whereabouts to carry out the secondary contact with hot-blast in the in-process that gets into screw conveyer 1 and carry out the transport, reach twice thermal desorption's effect.

Further, as shown in fig. 2 and 3, install buffering strip 23 on the outer wall of fixed pipe 24, buffering strip 23 is the heliciform and extends along the both ends of fixed pipe 24, and the cross-section semicircular structure and the diameter of heliciform buffering strip 23 increase gradually from top to bottom, and buffering strip 23 is hollow structure. Has certain retention effect on falling soil, and the hollow buffer strip 23 has the effects of heat collection and heat preservation.

Further, a plurality of inlet port 19 that is annular equidistance and distributes is seted up to the tip of moving pipe 12, inlet port 19 vertically runs through moving pipe 12, installs a plurality of longitudinal arrangement and equidistance distribution's deflector 14 on moving pipe 12's the inner wall, has seted up venthole 21 on the moving pipe 12 inner wall that is located the top of deflector 14, inlet port 19's inner wall just is located venthole 21 department and installs guide block 22.

Further, as shown in fig. 2 and 4, the tail end of the guide plate 14 extends obliquely towards the middle of two adjacent buffer strips 23, and the guide plate 14 is in an annular structure and the inner diameter of the guide plate 14 increases from top to bottom. The guide plate 14 guides the falling dry soil and also guides the air discharge.

Furthermore, the two sides of the bottom end of the moving pipe 12 are respectively connected with a supporting rod 16, the end of the supporting rod 16 is connected with a material pushing plate 17, the material pushing plate 17 is inclined and has the same angle with the inner bottom surface of the processing device 2, and the bottom surface of the material pushing plate 17 is close to the inner bottom surface of the processing device 2.

Furthermore, a through hole is formed in the surface of the support rod 16, and a connecting hole communicated with the air inlet 19 is formed in the upper end of the support rod 16.

Further, the air guide ring 11 is of an annular structure, the upper end of the air guide ring is fixedly connected with the inner top of the processing device 2, a plurality of air outlets are formed in the bottom of the air guide ring 11, the air outlets face the fixed pipe 24 and the moving pipe 12, and the air outlets located on the outer side are arranged corresponding to the air inlet 19.

Further, an electric blanking plate 25 is installed inside the material guiding pipe 3 and below the transmission column 13.

Further, as shown in fig. 5, the filter plates 8 are respectively installed on two sides of the interior of the screw conveyor 1, an air cavity is formed between the filter plates 8 and the end portion of the screw conveyor 1, the ends of the first air pipe 7 and the second air pipe 9 respectively extend into the air cavity, the end of the second air pipe 9 is provided with a connecting block 26, the surface of the connecting block 26 is provided with an air nozzle 27, and the air nozzle 27 faces the end of the screw conveyor 1 provided with the first air pipe 7. After the air is fed into the second air pipe 9, the air is blown out through the air nozzle 27, the moving direction of the air is opposite to that of soil, the air is fully contacted with the soil, secondary heat removal is carried out, and the heat removal quality is improved.

When the invention is used, soil is put into the processing device 2 through the feed hopper 4, the crushing wheel 15 is used for primary crushing, the crushed soil is pushed by the material pushing plate 17 to enter the material guiding hole 18, and moves up under the driving of the rotating helical blade 20, the soil moves up to the upper end of the helical blade 20 (the upper end of the fixed pipe 24) and then falls down to the periphery, the soil passes through the space between the fixed pipe 24 and the moving pipe 12, and with the hot gas contact that the venthole 21 blew out, deflector 14 and buffering strip 23 improve the soil and move the residence time between pipe 12 and the fixed pipe 24, improve the efficiency of being heated, enter into screw conveyer 1 through passage 3 after the soil is handled and carry, contact with the reverse admission of convection current in the transportation process, carry out the thermal desorption of the second time, improve the contact time between soil and the hot-blast, through twice thermal desorption, improve the efficiency of thermal desorption.

Claims

1. The thermal desorption remediation device for the polluted soil is characterized by comprising a treatment device (2), a material guide pipe (3) and a spiral conveyor (1), wherein the treatment device, the material guide pipe (3) and the spiral conveyor (1) are sequentially connected together from top to bottom, and inner cavities of the treatment device and the material guide pipe are communicated, and the spiral conveyor (1) and the material guide pipe (3) are positioned on one side of the top of the spiral conveyor (1); a fixed pipe (24) with the same inner diameter as the material guide pipe (3) is installed in the middle of the inner bottom of the processing device (2), a material guide hole (18) is formed in the side wall of the lower end of the fixed pipe (24), a moving pipe (12) is sleeved on the outer side of the fixed pipe (24), a transmission column (13) is vertically installed inside the processing device (2), the tail end of the transmission column (13) extends into the fixed pipe (24), a spiral blade (20) is installed on the outer wall of the fixed pipe (24), the transmission column (13), the fixed pipe (24) and the moving pipe (12) are coaxial, a plurality of connecting rods (10) distributed in an annular mode are installed on the surface of the transmission column (13), the connecting rods (10) are fixedly connected with the inner wall of the moving pipe (12) through the connecting rods (10), a motor (6) is installed on the top surface of the processing device (2), and the power output end of the motor (6) is connected with the transmission column (13) through a coupler;

two feed hoppers (4) are mounted on the outer wall of the processing device (2), crushing wheels (15) are respectively arranged inside the processing device (2) and positioned on two sides of the moving pipe (12), and the crushing wheels (15) are arranged below the feed hoppers (4);

the inside that is located pipe (12) top processing apparatus (2) is provided with air guide ring (11), and annular air duct (5) that are linked together with air guide ring (11) are installed to the outer wall upper end of processing apparatus (2), and air duct (5) surface connection has trachea one (7), the end of trachea one (7) is connected with the top one end of screw conveyer (1), trachea two (9) are still installed to the top other end of screw conveyer (1), the other end of trachea two (9) is used for connecting the air heater.

2. The thermal desorption remediation device for contaminated soil according to claim 1, wherein the outer wall of the fixed pipe (24) is provided with a buffer strip (23), the buffer strip (23) is spiral and extends along two ends of the fixed pipe (24), the cross section of the spiral buffer strip (23) is of a semicircular structure, the diameter of the spiral buffer strip is gradually increased from top to bottom, and the buffer strip (23) is of a hollow structure.

3. The thermal desorption remediation device for contaminated soil according to claim 1, wherein the end of the moving pipe (12) is provided with a plurality of air inlets (19) distributed in an annular and equidistant manner, the air inlets (19) longitudinally penetrate through the moving pipe (12), the inner wall of the moving pipe (12) is provided with a plurality of guide plates (14) which are longitudinally arranged and equidistantly distributed, the inner wall of the moving pipe (12) above the guide plates (14) is provided with air outlets (21), and the inner wall of the air inlets (19) and the air outlets (21) are provided with guide blocks (22).

4. The thermal desorption remediation device for contaminated soil according to claim 3, wherein the ends of the guide plates (14) extend obliquely towards the middle of the two adjacent buffer strips (23), the guide plates (14) are in an annular structure, and the inner diameters of the guide plates (14) increase from top to bottom.

5. The thermal desorption remediation device for contaminated soil according to any one of claims 1-4, wherein: the bottom both sides of moving pipe (12) are connected with branch (16) respectively, the end-to-end connection of branch (16) has scraping wings (17), scraping wings (17) are the slope form and the same with processing apparatus (2) interior bottom surface angle, and the bottom surface of scraping wings (17) is pressed close to with the interior bottom surface of processing apparatus (2).

6. The thermal desorption remediation device of contaminated soil according to claim 5, wherein: the surface of the support rod (16) is provided with a through hole, and the upper end of the support rod (16) is provided with a connecting hole communicated with the air inlet hole (19).

7. The thermal desorption remediation device of contaminated soil according to claim 6, wherein: the gas guide ring (11) is of an annular structure, the upper end of the gas guide ring is fixedly connected with the inner top of the processing device (2), a plurality of gas outlets are formed in the bottom of the gas guide ring (11), the gas outlets face the fixed pipe (24) and the moving pipe (12), and the gas outlets located on the outer side are arranged corresponding to the gas inlet holes (19).

8. The thermal desorption remediation device of contaminated soil according to claim 6, wherein: an electric blanking plate (25) is arranged in the material guide pipe (3) and below the transmission column (13).

9. The thermal desorption remediation device of contaminated soil according to claim 6, wherein: filter (8) are installed respectively to the inside both sides of screw conveyer (1), and form the air cavity between the tip of filter (8) and screw conveyer (1), the end of trachea one (7) and trachea two (9) extends to the air cavity respectively, and the end of trachea two (9) installs connecting block (26), the surface mounting of connecting block (26) has air cock (27), screw conveyer (1) one end of trachea one (7) is installed to air cock (27) orientation.