CN216027042U

CN216027042U - Microwave thermal desorption device for organic contaminated soil

Info

Publication number: CN216027042U
Application number: CN202121606896.XU
Authority: CN
Inventors: 邓江兰; 朱泽民; 叶明强
Original assignee: Changsha Industrial Research Institute Environmental Protection Co Ltd
Current assignee: Changsha Industrial Research Institute Environmental Protection Co Ltd
Priority date: 2021-07-15
Filing date: 2021-07-15
Publication date: 2022-03-15
Anticipated expiration: 2031-07-15

Abstract

The application relates to the technical field of organic soil remediation, and provides a microwave thermal desorption device for organic contaminated soil, which comprises a feeding system, a microwave thermal desorption rotary kiln system, a discharge cooling system and a waste gas treatment system which are sequentially connected; the microwave thermal desorption rotary kiln system comprises a rotary kiln main body, a plurality of microwave generators and thermometers which are arranged in the rotary kiln main body at intervals, and microwave suppressors arranged at two ends of the rotary kiln main body, wherein the rotary kiln main body is obliquely arranged, the feeding system is arranged at the higher end of the rotary kiln main body, and the waste gas treatment system is communicated with the higher end of the rotary kiln main body. The temperature in the rotary kiln main part passes through microwave heating, makes its temperature rise fast and the energy consumption is low, has improved desorption efficiency, and the slope of rotary kiln main part sets up and makes soil break away from automatically, and exhaust gas treatment system is connected with the higher end of rotary kiln main part, can collect and handle green waste gas.

Description

Microwave thermal desorption device for organic contaminated soil

Technical Field

The application belongs to the technical field of organic soil remediation, and more particularly relates to a microwave thermal desorption device for organic contaminated soil.

Background

The existing organic contaminated soil remediation methods comprise a normal-temperature analysis method, a chemical oxidation method, a gas phase extraction method, a high-temperature thermal desorption method, a leaching method, a biological heap method and the like. Among them, high-temperature thermal desorption is a comparatively widely used method.

The thermal desorption technology principle is that the polluted soil is heated to a temperature above the boiling point of the target pollutant through direct or indirect heating, and the target pollutant is separated and removed from the soil particles by selectively promoting the gasification of the pollutant through controlling the system temperature and the material residence time. The existing heterotopic thermal desorption technology for organic contaminated soil mainly adopts a drum-type thermal desorption technology, and the technology is introduced from foreign countries at first. Domestic heterotopic thermal desorption technique mainly adopts burning or electrothermal heating in the rotary kiln to carry out the desorption, then adopts biological method, condensation method, adsorption method and afterburning method etc. to handle to the tail gas that thermal desorption produced, because soil thickness is inhomogeneous, and heating time is long, and energy consumption when leading to thermal desorption is big, desorption efficiency is lower.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of this application is to provide an organic contaminated soil microwave thermal desorption device to it has the technical problem that the energy consumption is big, desorption efficiency is low to solve thermal desorption among the prior art.

In order to achieve the purpose, the technical scheme adopted by the application is as follows: the microwave thermal desorption device for the organic contaminated soil comprises a feeding system, a microwave thermal desorption rotary kiln system, a discharge cooling system and a waste gas treatment system which are sequentially connected; the microwave thermal desorption rotary kiln system comprises a rotary kiln main body, a plurality of microwave generators and thermometers which are arranged in the rotary kiln main body at intervals, and microwave suppressors arranged at two ends of the rotary kiln main body, wherein the rotary kiln main body is obliquely arranged, the feeding system is arranged at the higher end of the rotary kiln main body, and the waste gas treatment system is communicated with the higher end of the rotary kiln main body.

In one embodiment, the rotary kiln body sequentially comprises a reflecting layer, a temperature-resistant pouring layer, an insulating layer and an outer kiln cylinder body from inside to outside.

In one embodiment, the inclination angle of the rotary kiln body is 3-10 degrees, and the rotation speed of the rotary kiln body is 3-10 rpm.

In one embodiment, the microwave suppressor is a shielded energy leakage suppressor.

In one embodiment, the microwave suppressor comprises an inner lead plate layer and an outer stainless steel plate layer.

In one embodiment, the feeding system comprises a feeding hopper, a feeding belt conveyor, a receiving hopper and a screw conveyor, wherein the feeding belt conveyor is obliquely arranged, the feeding hopper is arranged at the lower end of the feeding belt conveyor, and the screw conveyor is horizontally arranged.

In one embodiment, the lower end of the rotary kiln body is a soil discharge end, and the discharge cooling system comprises a discharge hopper arranged below the lower end of the rotary kiln body, a discharge belt conveyor arranged below the discharge hopper, and a discharge cooling device for cooling the discharge hopper, wherein the discharge belt conveyor is obliquely arranged.

In one embodiment, the angle of inclination of the infeed and outfeed belt conveyors is 10-30 ° each.

In one embodiment, the waste gas treatment system comprises a cyclone separator, a spray cooling tower, a bag type dust collector and a tail gas fan which are sequentially connected through a pipeline, wherein the cyclone separator is communicated with the upper end of the rotary kiln body.

In one embodiment, the cyclone separator, the spray cooling tower and the bottom of the bag type dust collector are provided with blanking valves, and a control valve and a pressure gauge are arranged on a pipeline between the bag type dust collector and the tail gas fan.

The application provides an organic contaminated soil microwave thermal desorption device's beneficial effect lies in: through setting up a plurality of microwave generators in the rotary kiln main part, thereby send microwave energy in the rotary kiln main part, the rotary kiln main part makes the rotation of original molecular irregular thermal motion and effect molecule between the adjacent molecule in its inside material receive interference and restriction simultaneously, produce "friction benefit", a part of energy conversion of result is the molecular thermal motion function, show with hot form promptly, thereby the temperature rise in the messenger rotary kiln main part is fast and the energy consumption is low, desorption efficiency has been improved, the slope of rotary kiln main part sets up and makes soil break away from automatically, and the exhaust gas treatment system is connected with the higher extreme of rotary kiln main part, can collect and handle waste gas, green.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic connection diagram of a microwave thermal desorption apparatus for organic contaminated soil according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a microwave thermal desorption rotary kiln system in the microwave thermal desorption device for organic contaminated soil according to the embodiment of the present application;

FIG. 3 is a schematic layer structure diagram of a rotary kiln main body in the microwave thermal desorption device for organic contaminated soil according to an embodiment of the present disclosure;

fig. 4 is a schematic layer structure diagram of a microwave suppressor in a microwave thermal desorption device for organic contaminated soil according to an embodiment of the present application.

Wherein, in the figures, the respective reference numerals:

1. a feed hopper; 2. a feed belt conveyor; 3A, a receiving hopper; 3B, a discharge hopper; 4. a screw conveyor; 5A, an inlet microwave suppressor; 5B, an outlet microwave suppressor; 51. a stainless steel plate layer; 52. a lead plate layer; 6. a microwave thermal desorption rotary kiln system; 61. a rotary kiln body; 62. a tail gas collecting pipe; 63. a microwave generator; 64. a thermometer; 65. a cylinder outside the kiln; 66. a heat-insulating layer; 67. a temperature-resistant pouring layer; 68. a reflective layer; 7. a discharge cooling device; 8. a discharge belt conveyor; 9. a cyclone separator; 10. a spray cooling tower; 11. a bag type dust collector; 12. a control valve; 13. a pressure gauge; 14. a tail gas fan; 15A, a first blanking valve; 15B, a second blanking valve; 15C and a third blanking valve.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

Referring to fig. 1, a microwave thermal desorption apparatus for organic contaminated soil according to an embodiment of the present application will now be described. The microwave thermal desorption device for the organic contaminated soil comprises a feeding system, a microwave thermal desorption rotary kiln system, a discharge cooling system and a waste gas treatment system which are sequentially connected; wherein, feed system is used for carrying pending soil to microwave thermal desorption rotary kiln system in, and microwave thermal desorption rotary kiln system is used for heating soil for organic matter and soil separation, ejection of compact cooling system are used for cooling off exhaust soil, and exhaust gas treatment system is used for collecting the processing to the organic matter of being heated the evaporation, prevents its polluted environment.

As shown in fig. 1 and 2, in the present embodiment, the microwave thermal desorption rotary kiln system includes a rotary kiln main body 61, a plurality of microwave generators 63 arranged at intervals in the rotary kiln main body 61, a thermometer 64, and microwave suppressors arranged at two ends of the rotary kiln main body 61, a main transmission gear is arranged at the periphery of the rotary kiln main body 61, two ends of the rotary kiln main body 61 are rotatably arranged on a roller seat, and a driving gear on a motor is engaged with a column transmission gear to drive the rotary kiln main body 61 to rotate, so that soil in the rotary kiln main body 61 can be rotationally stirred, and the heating efficiency is improved. The thermometer 64 is used to measure the temperature inside the rotary kiln body 61 so that the temperature inside the rotary kiln body 61 can be controlled, and the microwave suppressor is used to absorb microwaves to prevent unnecessary damage. The two microwave suppressors are an inlet microwave suppressor 5A and an outlet microwave suppressor 5B, respectively.

In this embodiment, the rotary kiln main body 61 is arranged obliquely and the feeding system is arranged at the higher end of the rotary kiln main body 61, so that the rotary kiln main body 61 rotates to gradually transfer the soil in the rotary kiln main body 61 without adding other equipment, thereby realizing automatic discharging. Exhaust gas treatment system and rotary kiln main part 61's higher end intercommunication utilizes waste gas upwards exhaust characteristic like this, discharges waste gas rapidly, avoids waste gas to combine with soil again, guarantees the desorption effect.

In this embodiment, a plurality of microwave generators 63 are arranged in the rotary kiln body 61, so as to emit microwave energy into the rotary kiln body 61, meanwhile, the rotary kiln body 61 rotates to enable irregular thermal motion of original molecules in substances inside the rotary kiln body 61 and the rotation of action molecules between adjacent molecules to be interfered and limited, and friction benefit is generated, and as a result, a part of energy is converted into a molecular thermal motion function, namely, the molecular thermal motion function is expressed in a thermal form, so that the temperature in the rotary kiln body 61 rises quickly and the energy consumption is low, the desorption efficiency is improved, the rotary kiln body 61 is obliquely arranged and soil is automatically separated, and an exhaust gas treatment system is connected with the higher end of the rotary kiln body 61, so that exhaust gas can be collected and treated, and the rotary kiln is green and environment-friendly.

As shown in fig. 1 and 2, in the present embodiment, the rotary kiln main body 61 includes a reflective layer 68, a temperature-resistant casting layer 67, an insulating layer 66, and an external kiln cylinder 65 in sequence from inside to outside. The purpose of the reflective layer 68 is to reflect energy so that the energy repeatedly heats the soil, increasing energy utilization. The heat-resistant pouring layer 67 ensures that the rotary kiln main body 61 can bear high temperature, the heat-insulating layer 66 prevents heat loss, and the barrel outside the kiln plays a bearing role. The aluminum powder layer is sprayed on the reflecting layer 68, and has good reflecting capacity. The temperature-resistant pouring layer 67 is prepared by mixing silicon carbide powder and cement.

In this embodiment, the inclination angle of the rotary kiln body 61 is 3-10 °, preferably 10 °, so that the feeding end is high and the discharging end is low, and the rotation speed of the rotary kiln body 6161 is 3-10rpm, preferably 10rpm, so as to ensure that the soil is uniformly heated by rolling.

In this embodiment, the microwave suppressor is a shielded energy leakage suppressor. The microwave suppressor is an inlet microwave suppressor 5A at the feed end of the rotary kiln body 61 and an outlet microwave suppressor 5B at the discharge end of the rotary kiln body 61. As shown in fig. 4, the microwave suppressor includes an inner lead plate layer 52 and an outer stainless steel plate layer 51.

As shown in fig. 1, in this embodiment, the feeding system includes a feeding hopper 1, a feeding belt conveyor 2, a receiving hopper 3A and a screw conveyor 4, the feeding belt conveyor 2 is disposed obliquely, the feeding hopper 1 is disposed at a lower end of the feeding belt conveyor 2, and the screw conveyor 4 is disposed horizontally. Feed hopper 1 is used for leading-in to feeding belt conveyor 2 with soil on, and feeding belt conveyor 2 carries soil to screw conveyor 4 in, and screw conveyor 4 carries soil to carry out microwave heating in rotary kiln main part 61 again.

As shown in fig. 1, the lower end of the rotary kiln main body 61 is a soil discharge end, the discharge cooling system includes a discharge hopper 3B disposed below the lower end of the rotary kiln main body 61, a discharge belt conveyor 8 disposed below the discharge hopper 3B, and a discharge cooling device 7 for cooling the discharge hopper 3B, wherein the discharge belt conveyor 8 is disposed in an inclined manner. Go out hopper 3B and be used for connecing rotary kiln main part 61 exhaust soil, ejection of compact cooling device 7 is used for cooling off soil, and ejection of compact band conveyer 8 carries soil to follow-up treatment facility department on the one hand simultaneously, and on the other hand also makes things convenient for soil to carry out natural cooling. In this embodiment, the discharge cooling device 7 is an air-cooling machine or a blower. In other embodiments, the water cooling device may be a circulating water pipe for water-cooling the discharge hopper 3B.

In this embodiment, the inclination angles of the feeding belt conveyor 2 and the discharging belt conveyor 8 are both 10 to 30 degrees, for example, 10 degrees, 15 degrees, 20 degrees and 30 degrees, so that the selection can be performed according to the space environment, meanwhile, the soil is prevented from rolling automatically, and the stability of the soil staying on the belt is ensured. The feeding belt conveyor 2 and the discharging belt conveyor 8 are both conventional belt conveyors, and comprise structures such as belts, speed reducers, carrier rollers, supports, motors and the like.

As shown in fig. 1, the exhaust gas treatment system includes a cyclone 9, a spray cooling tower 10, a bag filter 11 and a tail gas blower 14 which are connected in sequence by pipes, wherein the cyclone 9 is communicated with the upper end of the rotary kiln main body 61. The upper end of the rotary kiln main body 61 is provided with a tail gas collecting pipe 62, and the tail gas collecting pipe 62 is connected with the cyclone separator 9 through a pipeline. Thus, the purification of the organic waste gas can be realized, and the organic waste gas is discharged after reaching the standard. Specifically, the bottom of the cyclone 9, the bottom of the spray cooling tower 10 and the bottom of the bag type dust collector 11 are all provided with a blanking valve, the blanking valve on the cyclone 9 is a first blanking valve 15A, the blanking valve on the spray cooling tower 10 is a second blanking valve 15B, the blanking valve on the bag type dust collector 11 is a third blanking valve 15C, and the blanking valves are all star-shaped discharge valves. A control valve 12 and a pressure gauge 13 are arranged on a pipeline between the bag-type dust collector 11 and the tail gas fan 14 and used for ensuring pressure balance. The tail gas fan 14 is used for forming negative pressure, and is convenient for tail gas in the rotary kiln main body 61 to be rapidly pumped out.

In the embodiment, the soil entering the feed hopper 1 is naturally dried, crushed, screened and analyzed at normal temperature in a closed greenhouse; the particle size after crushing and screening is less than 10mm, 10-20mm, 20-40mm and more than 40 mm; after the soil is naturally dried, crushed and screened, the volatile organic pollutants are resolved, and the soil pollution degree is reduced.

In the embodiment, the microwave thermal desorption machine is fast in temperature rise, reaches the thermal desorption temperature in a short time, improves the working efficiency and shortens the working time; the microwave heating is mainly characterized in that heating is generated in a heated object, a heat source is from the inside of the object, so that the inside and the outside of the object are heated simultaneously, the desorption effect is good, the time is short, the efficiency is high, meanwhile, the thermal stress caused by uneven temperature to equipment can be avoided, and the working safety is ensured; the microwave thermal desorption device for the organic contaminated soil has the advantages of small occupied area, good environment, avoidance of high temperature of the environment and improvement of the labor conditions of workers.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A microwave thermal desorption device for organic contaminated soil is characterized by comprising a feeding system, a microwave thermal desorption rotary kiln system, a discharge cooling system and a waste gas treatment system which are sequentially connected; the microwave thermal desorption rotary kiln system comprises a rotary kiln main body (61), a plurality of microwave generators (63) and thermometers (64) which are arranged in the rotary kiln main body (61) at intervals, and microwave suppressors arranged at two ends of the rotary kiln main body (61), wherein the rotary kiln main body (61) is obliquely arranged, the feeding system is arranged at the higher end of the rotary kiln main body (61), and the waste gas treatment system is communicated with the higher end of the rotary kiln main body (61).

2. The microwave thermal desorption device for the organic contaminated soil as claimed in claim 1, wherein: the rotary kiln main body (61) sequentially comprises a reflecting layer (68), a temperature-resistant pouring layer (67), a heat-insulating layer (66) and an outer kiln cylinder body (65) from inside to outside.

3. The microwave thermal desorption device for the organic contaminated soil as claimed in claim 2, wherein: the inclination angle of the rotary kiln main body (61) is 3-10 degrees, and the rotating speed of the rotary kiln main body (61) is 3-10 rpm.

4. The microwave thermal desorption device for the organic contaminated soil as claimed in claim 1, wherein: the microwave suppressor is a shielding type energy leakage suppressor.

5. The microwave thermal desorption device for the organic contaminated soil as claimed in claim 1, wherein: the microwave suppressor comprises an inner lead plate layer (52) and an outer stainless steel plate layer (51).

6. The microwave thermal desorption device for the organically-polluted soil as claimed in any one of claims 1 to 5, wherein: the feeding system comprises a feeding hopper (1), a feeding belt conveyor (2), a receiving hopper (3A) and a spiral conveyor (4), wherein the feeding belt conveyor (2) is obliquely arranged, the feeding hopper (1) is arranged at the lower end of the feeding belt conveyor (2), and the spiral conveyor (4) is horizontally arranged.

7. The microwave thermal desorption device for the organic contaminated soil as claimed in claim 6, wherein: the lower extreme of rotary kiln main part (61) is the soil discharge end, ejection of compact cooling system is including locating ejection of compact fill (3B) of the lower extreme below of rotary kiln main part (61), locating ejection of compact band conveyer (8) of ejection of compact fill (3B) below to and be used for right ejection of compact cooling device (7) that ejection of compact fill (3B) carry out the cooling, ejection of compact band conveyer (8) slope sets up.

8. The microwave thermal desorption device for the organic contaminated soil as claimed in claim 7, wherein: the inclination angles of the feeding belt conveyor (2) and the discharging belt conveyor (8) are both 10-30 degrees.

9. The microwave thermal desorption device for the organic contaminated soil as claimed in claim 8, wherein: the waste gas treatment system comprises a cyclone separator (9), a spray cooling tower (10), a bag type dust collector (11) and a tail gas fan (14) which are sequentially connected through pipelines, wherein the cyclone separator (9) is communicated with the higher end of the rotary kiln main body (61).

10. The microwave thermal desorption device for the organic contaminated soil as claimed in claim 9, wherein: the bottom of the cyclone separator (9), the bottom of the spray cooling tower (10) and the bottom of the bag type dust collector (11) are provided with discharge valves, and a control valve (12) and a pressure gauge (13) are arranged on a pipeline between the bag type dust collector (11) and the tail gas fan (14).