CN219581353U - Contaminated soil remediation equipment - Google Patents

Abstract

The utility model provides a contaminated soil remediation device, comprising: the feeding mechanism comprises a material conveying component and a preheating space, and the material conveying component is arranged in the preheating space; the material conveying part and the preheating space are respectively communicated with the desorption sleeve, and the desorption sleeve is arranged in the heating sleeve and is provided with a heating gap with the inner wall surface of the heating sleeve; and the heating mechanism is communicated with the heating gap, and is used for providing a heating medium into the heating gap so as to heat the desorption sleeve through the heating medium. The utility model solves the problem of higher cost of the polluted soil restoration equipment in the prior art.

Description

Contaminated soil remediation equipment

Technical Field

The utility model relates to the technical field of organic contaminated soil remediation, in particular to contaminated soil remediation equipment.

Background

At present, the thermal desorption technology gradually begins to be applied to the field of organic contaminated soil remediation, and can be divided into indirect thermal desorption and direct thermal desorption according to a heating mode.

The indirect thermal desorption technology is to indirectly heat the polluted soil by utilizing high-temperature flue gas generated by burning fuel such as natural gas and the like, so that the polluted soil is heated to a target heating temperature under the condition of isolating oxygen, thereby volatilizing organic pollutants in the soil, separating the organic pollutants from solid matrixes in the soil and realizing harmless treatment of the polluted soil.

The direct thermal desorption technology is most different from the indirect thermal desorption technology in that high-temperature flue gas generated by burning fuel such as natural gas is directly contacted with polluted soil, so that the purpose of raising the temperature of the soil to the target heating temperature is achieved.

The indirect thermal desorption technology has the advantages of small equipment occupation area, stable operation, low cost and the like, but has obvious defects of treatment capacity, thermal desorption energy consumption, heating temperature and the like; the direct thermal desorption technology has the problems of complex waste gas components, high equipment cost, large occupied area and the like.

In the prior art, the direct thermal desorption technology and the indirect thermal desorption technology are generally combined, but the processes of direct thermal desorption and indirect thermal desorption are only combined into the same equipment, namely, the direct heating is performed after the indirect heating process is performed, so that the cost is increased, and the energy consumption is also increased.

Disclosure of Invention

The utility model mainly aims to provide a contaminated soil remediation device, which aims to solve the problem of high cost of the contaminated soil remediation device in the prior art.

In order to achieve the above object, the present utility model provides a contaminated soil restoration apparatus comprising: the feeding mechanism comprises a material conveying component and a preheating space, and the material conveying component is arranged in the preheating space; the material conveying part and the preheating space are respectively communicated with the desorption sleeve, and the desorption sleeve is arranged in the heating sleeve and is provided with a heating gap with the inner wall surface of the heating sleeve; and the heating mechanism is communicated with the heating gap, and is used for providing a heating medium into the heating gap so as to heat the desorption sleeve through the heating medium.

Further, the thermal desorption mechanism further includes: and the stirring parts are arranged on the inner wall surface of the desorption sleeve, the stirring parts are multiple, and the stirring parts are arranged at intervals along the circumferential direction of the desorption sleeve.

Further, desorption sleeve includes first sleeve, and material transport part and preheating space communicate with first sleeve respectively, and stirring part includes: the first stirring board group of multiunit sets up on the inner wall surface of first telescopic, and multiunit first stirring board group sets up along the axis direction interval of first telescopic, and the horizontal distance between two adjacent first stirring board groups is 40cm to 60cm.

Further, each group of first stirring plates comprises a plurality of first stirring plates, the plurality of first stirring plates are arranged at intervals along the circumferential direction of the first sleeve, and an included angle between two adjacent first stirring plates is 20-30 degrees.

Further, the desorption sleeve still includes the second sleeve, and the second sleeve is kept away from the one end intercommunication of material transmission part with first sleeve, stirs the part and still includes: the second stirring plate groups are arranged on the inner wall surface of the second sleeve, the second stirring plate groups are arranged at intervals along the axial direction of the second sleeve, and the horizontal distance between two adjacent second stirring plate groups is 20cm to 40cm.

Further, each second stirring plate group comprises a plurality of second stirring plates, the second stirring plates are arranged at intervals along the circumferential direction of the second sleeve, and an included angle between two adjacent second stirring plates is 15-20 degrees.

Further, the desorption sleeve further comprises: the third sleeve and the heat preservation sleeve that connect gradually, the third sleeve is connected with the one end that the second sleeve kept away from first sleeve.

Further, the heating mechanism includes: the first burner group is arranged below the first sleeve and communicated with the heating gap; the second burner group is arranged below the second sleeve and communicated with the heating gap; the third burner group is arranged below the third sleeve and communicated with the heating gap; and the fourth burner group is arranged below the heat preservation sleeve and communicated with the heating gap.

Further, the heating mechanism also comprises a smoke emission component, the smoke emission component comprises a smoke transmission channel, a first transmission branch and a second transmission branch, one end of the smoke transmission channel is communicated with a smoke source, and the other end of the smoke transmission channel is respectively communicated with the first transmission branch and the second transmission branch; one end of the first transmission branch, which is far away from the flue gas transmission channel, is communicated with the preheating space, and one end of the second transmission branch, which is far away from the flue gas transmission channel, is communicated with the heating gap.

Further, the fume emission assembly further comprises: the first control valve is arranged on the first transmission branch and is communicated with the first transmission branch; and the smoke exhaust pipeline is communicated with the smoke transmission channel and is provided with a second control valve.

By applying the technical scheme of the utility model, the contaminated soil remediation equipment comprises a feeding mechanism, a thermal desorption mechanism and a heating mechanism, wherein the feeding mechanism comprises a material conveying component and a preheating space, and the material conveying component is arranged in the preheating space; the thermal desorption mechanism comprises a desorption sleeve and a heating sleeve, the material conveying part and the preheating space are respectively communicated with the desorption sleeve, and the desorption sleeve is arranged in the heating sleeve and is provided with a heating gap with the inner wall surface of the heating sleeve; the heating mechanism is communicated with the heating gap, and a heating medium is provided into the heating gap through the heating mechanism so as to heat the desorption sleeve through the heating medium. The setting can carry out direct thermal desorption to contaminated soil through the high temperature air current that flows in to the heating sleeve in the preheating space like this, utilizes the heating clearance between heating sleeve and the desorption sleeve simultaneously, carries out indirect thermal desorption to the contaminated soil in the desorption sleeve, like this, combines direct thermal desorption process and indirect thermal desorption process, has accelerated the desiccation speed of contaminated soil in the stove section of thick bamboo, and equipment overall structure is simple, and is with low costs.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

FIG. 1 shows a schematic structural view of an embodiment of a contaminated soil remediation apparatus according to the utility model;

FIG. 2 shows a cross-sectional view of a first sleeve of a contaminated soil remediation apparatus according to the utility model;

fig. 3 shows a cross-sectional view of a second sleeve of a contaminated soil remediation apparatus according to the utility model.

Wherein the above figures include the following reference numerals:

1. a feed mechanism; 10. a material transfer member; 11. preheating the space;

2. a thermal desorption mechanism; 20. a desorption sleeve; 201. a first sleeve; 202. a second sleeve; 203. a third sleeve; 204. a thermal insulation sleeve; 21. heating the sleeve; 22. heating the gap; 23. an agitating member; 231. a first agitating plate set; 2310. a first agitation plate; 232. a second agitating plate group; 2320. a second agitating plate;

3. a heating mechanism; 31. a first burner group; 32. a second burner group; 33. a third burner group; 34. a fourth burner group; 35. a smoke discharge assembly; 350. a flue gas transmission channel; 3501. a first transmission branch; 3502. a second transmission branch; 351. a heat exchanger; 352. a smoke exhaust pipeline; 3503. a first control valve; 3520. a second control valve;

4. a discharge channel; 5. a tail gas treatment device; 6. and a discharging device.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.

Referring to fig. 1 to 3, the present utility model provides a contaminated soil remediation apparatus comprising: the feeding mechanism 1, the feeding mechanism 1 comprises a material conveying component 10 and a preheating space 11, and the material conveying component 10 is arranged in the preheating space 11; the thermal desorption mechanism 2, the thermal desorption mechanism 2 comprises a desorption sleeve 20 and a heating sleeve 21, the material conveying part 10 and the preheating space 11 are respectively communicated with the desorption sleeve 20, the desorption sleeve 20 is arranged in the heating sleeve 21, and a heating gap 22 is arranged between the desorption sleeve 20 and the inner wall surface of the heating sleeve 21; and a heating mechanism 3 which communicates with the heating gap 22, and which supplies a heating medium into the heating gap 22 through the heating mechanism 3 so as to heat the desorption sleeve 20 through the heating medium.

According to the contaminated soil remediation equipment provided by the utility model, the contaminated soil remediation equipment comprises a feeding mechanism 1, a thermal desorption mechanism 2 and a heating mechanism 3, wherein the feeding mechanism 1 comprises a material conveying part 10 and a preheating space 11, and the material conveying part 10 is arranged in the preheating space 11; the thermal desorption mechanism 2 comprises a desorption sleeve 20 and a heating sleeve 21, the material conveying part 10 and the preheating space 11 are respectively communicated with the desorption sleeve 20, and the desorption sleeve 20 is arranged in the heating sleeve 21 and is provided with a heating gap 22 with the inner wall surface of the heating sleeve 21; the heating mechanism 3 communicates with the heating gap 22, and a heating medium is supplied into the heating gap 22 through the heating mechanism 3 to heat the desorption sleeve 20 by the heating medium. The setting can carry out direct thermal desorption to contaminated soil through the high temperature air current that flows in to in the heating sleeve 21 in the preheating space 11 like this, utilizes the heating clearance 22 between heating sleeve 21 and the desorption sleeve 20 simultaneously, carries out indirect thermal desorption to the contaminated soil in the desorption sleeve 20, like this, combines direct thermal desorption process and indirect thermal desorption process, has accelerated the desiccation speed of contaminated soil in the stove section of thick bamboo, and equipment overall structure is simple, and is with low costs.

In order to improve the indirect heating efficiency and reduce the energy consumption, the thermal desorption mechanism 2 further includes: the stirring members 23 are provided on the inner wall surface of the desorption sleeve 20, the stirring members 23 are plural, and the plurality of stirring members 23 are provided at intervals along the circumferential direction of the desorption sleeve 20.

Specifically, as shown in fig. 2, the desorption sleeve 20 includes a first sleeve 201, the material transporting part 10 and the preheating space 11 are respectively communicated with the first sleeve 201, and the stirring part 23 includes: a plurality of first agitating plate groups 231 are provided on the inner wall surface of the first sleeve 201, the plurality of first agitating plate groups 231 are provided at intervals along the axial direction of the first sleeve 201, and the horizontal distance between two adjacent first agitating plate groups 231 is 40cm to 60cm. Each of the first agitating plate groups 231 includes a plurality of first agitating plates 2310, and the plurality of first agitating plates 2310 are spaced apart in the circumferential direction of the first sleeve 201, and an included angle between adjacent two of the first agitating plates 2310 is 20 to 30 degrees. In the first sleeve 201, contaminated soil is thrown by the plurality of first agitating plates 2310 in the first sleeve 201, increasing a contact area with high temperature flue gas in the first sleeve 201, and improving heat transfer efficiency. Meanwhile, the polluted soil is indirectly heated by the high temperature in the heating gap 22, and the temperature rising rate of the soil is further improved by utilizing the double heating condition.

As shown in fig. 3, the desorption sleeve 20 further includes a second sleeve 202, the second sleeve 202 communicates with an end of the first sleeve 201 remote from the material transfer unit 10, and the stirring unit 23 further includes: the plurality of second agitating plate sets 232 are disposed on the inner wall surface of the second sleeve 202, the plurality of second agitating plate sets 232 are disposed at intervals along the axial direction of the second sleeve 202, and the horizontal distance between two adjacent second agitating plate sets 232 is 20cm to 40cm. Each of the second agitating plate groups 232 includes a plurality of second agitating plates 2320, the plurality of second agitating plates 2320 being disposed at intervals along the circumferential direction of the second sleeve 202, and an included angle between two adjacent second agitating plates 2320 being 15 degrees to 20 degrees. The main function of the second sleeve 202 is to dry, the throwing frequency of the polluted soil in the second sleeve 202 is higher, the contact area with high-temperature smoke is further increased, the heat transfer efficiency is further improved, the volatilization of moisture in the soil is accelerated, meanwhile, the polluted soil is indirectly heated by means of the high temperature of the heating gap 22, the evaporation of the moisture in the soil is further accelerated by utilizing the double heating condition, and the drying rate is further improved.

Further, the desorption sleeve 20 further includes: and the third sleeve 203 and the heat preservation sleeve 204 are sequentially connected, and the third sleeve 203 is connected with one end, far away from the first sleeve 201, of the second sleeve 202. The third sleeve 203 continues to heat the soil and then enters the insulating sleeve 204, maintaining the soil temperature mainly by indirect heating until the soil is expelled.

In the present utility model, the heating mechanism 3 includes: a first burner group 31 disposed below the first sleeve 201 and communicating with the heating gap 22; a second burner group 32 disposed below the second sleeve 202 and in communication with the heating gap 22; a third burner group 33 disposed below the third sleeve 203 and communicating with the heating gap 22; a fourth burner group 34 is disposed below the thermal sleeve 204 and communicates with the heating gap 22. The temperatures in the first sleeve 201, the second sleeve 202, the third sleeve 203 and the insulating sleeve 204 are ensured by the first burner group 31, the second burner group 32, the third burner group 33 and the fourth burner group 34 which are correspondingly arranged. Wherein the heating mechanism 3 further comprises a second combustion air line and a second air line, the second combustion air line is respectively communicated with the first burner group 31, the second burner group 32, the third burner group 33 and the fourth burner group 34, and the second air line is respectively communicated with the first burner group 31, the second burner group 32, the third burner group 33 and the fourth burner group 34. Combustion air and air are combusted in the second combustion chamber in each burner group, and the resulting high temperature flue gas is discharged into the heating gap 22.

Wherein the first burner group 31 comprises a first burner, the second burner group 32 comprises a second burner and a third burner, the third burner group 33 comprises a fourth burner and a fifth burner, and the fourth burner group 34 comprises a sixth burner.

In the embodiment provided by the present utility model, the heating mechanism 3 further includes: the flue gas emission assembly 35, the flue gas emission assembly 35 comprises a flue gas transmission channel 350, a first transmission branch 3501 and a second transmission branch 3502, one end of the flue gas transmission channel 350 is communicated with a flue gas source, and the other end of the flue gas transmission channel 350 is respectively communicated with the first transmission branch 3501 and the second transmission branch 3502; one end of the first transfer branch 3501, which is far away from the flue gas transfer channel 350, is communicated with the preheating space 11, and one end of the second transfer branch 3502, which is far away from the flue gas transfer channel 350, is communicated with the heating gap 22.

The fume exhaust assembly 35 further comprises: a first control valve 3503 disposed on the first transfer branch 3501 and in communication with the first transfer branch 3501; the smoke exhaust pipeline 352 is communicated with the smoke transmission channel 350, and a second control valve 3520 is arranged on the smoke exhaust pipeline 352.

Specifically, the flue gas emission component 35 further includes a heat exchanger 351, a first combustion air pipeline and a first air pipeline, where the first air pipeline and the first combustion air pipeline are respectively communicated with the heat exchanger 351, the heat exchanger 351 is disposed between the flue gas transmission channel 350 and the smoke exhaust pipeline 352, a chimney is further disposed at an outlet end of the smoke exhaust pipeline 352, and the first control valve 3503 is combined with the second control valve 3520 to control the flow direction of the flue gas in the first transmission branch 3501, so that the high-temperature flue gas can be introduced into the preheating space 11, or the flue gas in the heating gap 22 sequentially flows through the second transmission branch 3502, the flue gas transmission channel 350 and the smoke exhaust pipeline 352 to be exhausted, where a flowmeter is disposed on the first transmission branch 3501 for monitoring the flow rate of the high-temperature flue gas introduced into the desorption sleeve 20.

In particular embodiments, the contaminated soil remediation apparatus further comprises: a discharge channel 4 communicated with the outlet end of the desorption sleeve 20; the tail gas treatment device 5 is arranged above the discharging channel 4 and is communicated with the discharging channel 4; the discharging device 6 is arranged below the discharging channel 4 and is communicated with the discharging channel 4, and the material in the desorption sleeve 20 is discharged through the discharging device 6. The arrangement is such that the flue gas in the discharge channel 4 is directly dissipated upwards into the tail gas treatment device 5 for tail gas treatment.

In the utility model, the material conveying component 10 is a screw conveyor, and the material in the feeding bin is conveyed into the screw conveyor through a conveying belt.

The outer wall of the first sleeve 201 is provided with a first temperature sensor for monitoring the outer wall temperature of the first sleeve 201, the outer wall of the second sleeve 202 is provided with a second temperature sensor for monitoring the outer wall temperature of the second sleeve 202, the outer wall of the third sleeve 203 is provided with a third temperature sensor for monitoring the outer wall temperature of the third sleeve 203, the outer wall of the heat-preserving sleeve 204 is provided with a fourth temperature sensor for monitoring the outer wall temperature of the heat-preserving sleeve 204, and a fifth temperature sensor for monitoring the soil temperature after thermal desorption is arranged in the discharging channel 4; a first infrared temperature detector is arranged in the first sleeve 201, and the first infrared temperature detector is positioned at the discharge end of the first sleeve 201 and is used for monitoring the temperature of polluted soil positioned at the tail end of the first sleeve 201; a second infrared temperature detector is arranged in the second sleeve 202, and the second infrared temperature detector is positioned at the discharge end of the second sleeve 202 and is used for monitoring the temperature of polluted soil positioned at the tail end of the second sleeve 202; a third infrared temperature detector is arranged in the third sleeve 203 and is positioned at the discharge end of the third sleeve 203 and used for monitoring the temperature of polluted soil positioned at the tail end of the third sleeve 203; a fourth infrared temperature detector is arranged in the heat preservation sleeve 204, and the fourth infrared temperature detector is positioned in the middle of the heat preservation sleeve 204 and is used for monitoring the temperature of polluted soil in the middle section of the heat preservation sleeve 204.

In the practical application process, the polluted soil is firstly transported into the upper bin by mechanical equipment, the feeding amount is controlled by the upper bin according to the process requirement, and the polluted soil enters a feeding screw (a material conveying component 10) through a conveying belt. The polluted soil enters the first sleeve 201 through the spiral propelling layer, the preheating space 11 is used for conveying high-temperature smoke, and the heat of the hot smoke in the preheating space 11 is transferred to the polluted soil of the inner spiral propelling layer in a heat conduction mode, so that the preheating of the polluted soil is completed in the feeding spiral (the material conveying component 10), and the preheated polluted soil is raised to about 50 ℃ from the initial temperature.

Subsequently, the contaminated soil enters the desorption sleeve 20 through the feeding screw, firstly falls on the first sleeve 201, meanwhile, the high-temperature flue gas enters the first sleeve 201 through the preheating space 11 of the feeding screw (the material conveying component 10), and in the first sleeve 201, the contaminated soil is scattered by a plurality of first stirring plates 2310 in the first sleeve 201, so that the contact area with the high-temperature flue gas is increased, and the heat transfer efficiency is improved; at the same time, the contaminated soil is indirectly heated by the high temperature of the heating gap 22. And the temperature rising rate of the soil is further improved by utilizing the double heating condition. When the contaminated soil reaches the end of the first sleeve 201, the first stage of heating is completed, at which point the temperature of the contaminated soil rises to 100 ℃.

Subsequently, the contaminated soil enters the second sleeve 202, initiating a second stage of heating. The main function of the second stage heating is drying. The second stirring plates 2320 in the second sleeve 202 are small in spacing and large in quantity, the throwing frequency of the polluted soil in the second sleeve 202 is high, the contact area with high-temperature flue gas is further increased, the heat transfer efficiency is further improved, and the volatilization of water in the soil is accelerated; at the same time, the contaminated soil is indirectly heated by the high temperature of the heating gap 22. And the evaporation of water in the soil is further accelerated by using the double heating condition, so that the drying rate is further improved. When the contaminated soil reaches the end of the second sleeve 202, the moisture content in the contaminated soil is changed from the initial state to approximately 0%, and the second stage of heating is completed.

The heat required by the heating in the two stages is mainly derived from high-temperature flue gas introduced into the preheating space 11, namely the polluted soil is mainly directly heated in the first sleeve 201 and the second sleeve 202, and is indirectly heated as an auxiliary.

After the second stage of heating is completed, the water in the soil is almost completely evaporated, and only solids and organic matters remain in the soil, and the soil in the furnace cylinder enters the third sleeve 203 to start the third stage of heating. The fourth burner and the fifth burner in the third burner group 33 heat the furnace wall of the third sleeve 203, so that the temperature of the furnace wall of the third sleeve 203 can reach more than 700 ℃, and the temperature difference between the heating gap 22 and the soil is utilized to quickly transfer heat to the soil, thereby accelerating the temperature rising speed of the soil to the target heating temperature. Since the third sleeve 203 has no stirring member 23, the soil therein is not thrown out, and the direct heating efficiency is low, so the soil is mainly warmed up by indirect heating. When the soil reaches the end of the third sleeve 203, the third stage of heating is completed, and at this time, the highest temperature of the soil can reach 600 ℃, so that the boiling point requirement of most organic pollutants can be met, and the applicability of soil remediation is increased.

Subsequently, the contaminated soil enters the insulating sleeve 204, and the temperature of the soil is maintained in the insulating sleeve 204 mainly by indirect heating until the soil exits the barrel, thereby completing the fourth-stage insulation. At this stage, the pollutant in the soil is desorbed, thereby realizing harmless treatment of the polluted soil.

The two-stage heating is accomplished primarily by indirect heating.

In this scheme, the initial temperature of the high temperature flue gas that all combustors burnt produced is about 1000 ℃, and high temperature flue gas carries out heat transfer to heating clearance 22 through the combustor group at first, provides heat for the indirect heating of the contaminated soil in desorption sleeve 20. After the heat transfer required for indirect heating is completed, the flue gas is introduced into the first transfer branch 3501, and enters the first sleeve 201 from the preheating space 11. At this time, the temperature of the high-temperature flue gas is about 600 ℃, and the contaminated soil is heated in the first sleeve 201 and the second sleeve 202 of the desorption sleeve 20 in a direct heating manner, especially, the second sleeve 202 is heated in a direct heating manner, so that a large amount of heat is absorbed by the soil moisture evaporation, and the heat in the high-temperature flue gas is reduced, and the direct heating is completed after the two stages, at this time, the temperature of the high-temperature flue gas is about 400 ℃, which is insufficient for providing the heat required for subsequently heating the contaminated soil. In the third sleeve 203 and the heat-preserving sleeve 204, the heat of the soil heating and preserving is mainly derived from the high-temperature flue gas generated in the third burner group 33 and the fourth burner group 34, the heat is firstly transferred to the heating gap 22, and the heating gap 22 transfers the heat to the soil in the interior, so that the polluted soil is indirectly heated, and the pollutants in the soil are mainly desorbed with the soil particles in the heat-preserving sleeve 204, so that the pollutants are removed. In the process, the temperature change of the polluted soil in the furnace barrel is represented by means of the temperature detector and the temperature sensor, so that technicians are assisted in judging the thermal desorption process of the polluted soil, and energy consumption is saved while accurate control of the temperature is realized by adjusting the flow of the returned smoke and the output power of the burner.

In order to meet the different repair process requirements, the system can provide various embodiments, as follows:

embodiment 1

When the thermal desorption restoration is needed to be completed under the condition of oxygen insulation in the treatment of the polluted soil such as petroleum hydrocarbon, the high-temperature flue gas from the first combustion chamber can be emptied by opening the second control valve 3520 and closing the first control valve 3503 at the same time, so that the high-temperature flue gas is prevented from entering the heating gap 22. At this time, the indication number of the flowmeter on the first transmission branch 3501 is zero, which indicates that the high-temperature flue gas stops supplying the high-temperature flue gas into the preheating space 11, and the high-temperature flue gas is exhausted through the chimney after heat exchange of the heat exchanger 351. The polluted soil is indirectly heated in the first sleeve 201 and the second sleeve 202 through the first burner group 31 and the second burner group 32 to finish the temperature rise from the initial temperature to 100 ℃, and the moisture in the soil is evaporated; the contaminated soil is indirectly heated in the third sleeve 203, the temperature is raised from 100 ℃ to a target heating temperature, the target heating temperature is maintained in the thermal sleeve 204 and indirect thermal desorption is performed to remove contaminants from the soil. The thermal desorption process meets the condition of oxygen insulation, and ensures the safe and stable operation of the system.

In the process, according to the temperature display of the first infrared temperature detector, the output power of the first burner in the first burner group 31 is regulated, so that the temperature of the soil at the tail end of the first sleeve 201 is ensured to be increased to 100 ℃; according to the temperature display of the second infrared temperature detector, when the second infrared temperature detector displays higher than 100 ℃, the output power of the second burner and the third burner in the second burner group 32 can be reduced, and the consumption of fuel can be reduced; according to the temperature display of the third infrared temperature detector, when the temperature displayed by the third infrared temperature detector is higher than the target heating temperature, the output power of the fourth burner and the fifth burner in the third burner group 33 can be reduced, and when the temperature displayed by the third infrared temperature detector is lower than the target heating temperature, the output power of the fourth burner and the fifth burner in the third burner group 33 can be increased, so that the temperature of the polluted soil at the tail end of the third sleeve 203 can reach the target heating temperature; according to the temperature display of the fourth infrared temperature detector, when the temperature displayed by the fourth infrared temperature detector is lower than the target heating temperature, the output power of the sixth burner in the fourth burner group 34 can be increased, and when the temperature displayed by the fourth infrared temperature sensor is higher than the target heating temperature, the output power of the sixth burner in the fourth burner group 34 can be reduced, and the fuel consumption can be reduced. Through accurate control of temperature, energy consumption is saved when meeting repair process requirements.

Embodiment II

According to the process requirement, when the boiling point of pollutants in the treated polluted soil is higher, the target heating temperature cannot be met by only indirect heating or when the energy consumption is higher, the heat efficiency is improved by recycling high-temperature flue gas, and the energy consumption is reduced while the repairing process requirement is met. The specific mode is as follows:

the openings of the first control valve 3503 and the second control valve 3520 are adjusted to introduce the high-temperature flue gas into the preheating space 11 of the thermal desorption system. The contaminated soil was first preheated in the feed screw (material transfer unit 10), then first stage heated in the first sleeve 201 and the temperature reached 100 ℃ at the end of the first sleeve 201; the second stage of heating is then completed within the second sleeve 202 and evaporation of the water is completed at the end of the second sleeve 202 and the contaminated soil is allowed to warm from 100 ℃ at the end of the second sleeve 202. The heating of the first two stages is mainly direct heating, high-temperature flue gas is led into the furnace barrel to be in direct contact with polluted soil, the polluted soil is fully thrown by virtue of stirring components arranged on the first sleeve 201 and the second sleeve 202, and the contact area of soil particles and the high-temperature flue gas is improved, so that the thermal efficiency is improved.

In the third sleeve 203, the temperature of the soil is continuously raised, and when the contaminated soil reaches the end of the third sleeve 203, the contaminated soil temperature is heated to the target heating temperature. In the heat preservation sleeve 204, the soil is in a heat preservation state, the temperature is maintained at a target heating temperature, and the pollutants in the soil are thermally desorbed at the stage, so that harmless treatment of the polluted soil is realized. The heat required for the two stages is mainly derived from the heat released by the combustion of the fuel such as natural gas in the combustion chambers of the third burner group 33 and the fourth burner group 34, and is indirectly transferred to the soil through the heating gap 22, thereby completing the indirect heating of the polluted soil.

In the process, according to the temperature display of the first infrared temperature detector, the opening degree of the first control valve 3503 is adjusted, and the temperature of the soil at the tail end of the first sleeve 201 is ensured to rise to 100 ℃; according to the temperature display of the second infrared temperature detector, when the display of the second infrared temperature detector is higher than 100 ℃, the output power of the second burner and the third burner in the second burner group 32 can be reduced, the consumption of fuel can be reduced, and when the display of the second infrared temperature detector is lower than 100 ℃, the opening degree of the first control valve 3503 can be increased, the high-temperature flue gas led into the first sleeve 201 can be increased, and the heat input can be improved; according to the temperature display of the third infrared temperature detector, when the temperature displayed by the third infrared temperature detector is higher than the target heating temperature, the output power of the fourth burner and the fifth burner in the third burner group 33 can be reduced, and when the temperature displayed by the third infrared temperature detector is lower than the target heating temperature, the opening of the first control valve 3503 can be increased, the high-temperature smoke flux can be increased, the utilization rate of smoke heat can be improved, and the temperature of polluted soil at the tail end of the third sleeve 203 can be ensured to reach the target heating temperature; according to the display temperature of the fourth infrared temperature detector, when the temperature displayed by the fourth infrared temperature detector is lower than the target heating temperature, the opening degree of the first control valve 3503 can be increased, the high-temperature flue gas flux can be increased, the utilization rate of the flue gas heat can be improved, and when the temperature displayed by the fourth infrared temperature detector is higher than the target heating temperature, the output power of the sixth burner in the fourth burner group 34 can be reduced, and the fuel consumption can be reduced. The energy consumption is reduced by improving the utilization rate of heat in the high-temperature flue gas.

From the above description, it can be seen that the above embodiments of the present utility model achieve the following technical effects:

according to the contaminated soil remediation equipment provided by the utility model, the contaminated soil remediation equipment comprises a feeding mechanism 1, a thermal desorption mechanism 2 and a heating mechanism 3, wherein the feeding mechanism 1 comprises a material conveying part 10 and a preheating space 11, and the material conveying part 10 is arranged in the preheating space 11; the thermal desorption mechanism 2 comprises a desorption sleeve 20 and a heating sleeve 21, the material conveying part 10 and the preheating space 11 are respectively communicated with the desorption sleeve 20, and the desorption sleeve 20 is arranged in the heating sleeve 21 and is provided with a heating gap 22 with the inner wall surface of the heating sleeve 21; the heating mechanism 3 communicates with the heating gap 22, and a heating medium is supplied into the heating gap 22 through the heating mechanism 3 to heat the desorption sleeve 20 by the heating medium. The setting can carry out direct thermal desorption to contaminated soil through the high temperature air current that flows in to in the heating sleeve 21 in the preheating space 11 like this, utilizes the heating clearance 22 between heating sleeve 21 and the desorption sleeve 20 simultaneously, carries out indirect thermal desorption to the contaminated soil in the desorption sleeve 20, like this, combines direct thermal desorption process and indirect thermal desorption process, has accelerated the desiccation speed of contaminated soil in the stove section of thick bamboo, and equipment overall structure is simple, and is with low costs.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (10)

1. A contaminated soil remediation apparatus comprising:

the feeding mechanism (1), the feeding mechanism (1) comprises a material conveying component (10) and a preheating space (11), and the material conveying component (10) is arranged in the preheating space (11);

the thermal desorption mechanism (2), the thermal desorption mechanism (2) comprises a desorption sleeve (20) and a heating sleeve (21), the material conveying component (10) and the preheating space (11) are respectively communicated with the desorption sleeve (20), and the desorption sleeve (20) is arranged in the heating sleeve (21) and is provided with a heating gap (22) with the inner wall surface of the heating sleeve (21);

and a heating mechanism (3) which is communicated with the heating gap (22), and is used for providing a heating medium into the heating gap (22) through the heating mechanism (3) so as to heat the desorption sleeve (20) through the heating medium.

2. The contaminated soil remediation apparatus of claim 1 wherein the thermal desorption mechanism (2) further comprises:

stirring parts (23) are arranged on the inner wall surface of the desorption sleeve (20), a plurality of stirring parts (23) are arranged, and the stirring parts (23) are arranged at intervals along the circumferential direction of the desorption sleeve (20).

3. A contaminated soil remediation apparatus according to claim 2 wherein the desorption sleeve (20) comprises a first sleeve (201), the material transfer means (10) and the pre-heating space (11) being in communication with the first sleeve (201) respectively, the agitation means (23) comprising:

the plurality of groups of first stirring plate groups (231) are arranged on the inner wall surface of the first sleeve (201), the plurality of groups of first stirring plate groups (231) are arranged at intervals along the axial direction of the first sleeve (201), and the horizontal distance between two adjacent groups of first stirring plate groups (231) is 40cm to 60cm.

4. A contaminated soil remediation apparatus according to claim 3 wherein each of the first agitating plate sets (231) comprises a plurality of first agitating plates (2310), the plurality of first agitating plates (2310) being spaced apart along the circumferential direction of the first sleeve (201), the angle between adjacent ones of the first agitating plates (2310) being 20 to 30 degrees.

5. A contaminated soil remediation apparatus according to claim 3 wherein the desorption sleeve (20) further comprises a second sleeve (202), the second sleeve (202) being in communication with an end of the first sleeve (201) remote from the material transfer means (10), the agitation means (23) further comprising:

the second stirring plate groups (232) are arranged on the inner wall surface of the second sleeve (202), the second stirring plate groups (232) are arranged at intervals along the axial direction of the second sleeve (202), and the horizontal distance between two adjacent second stirring plate groups (232) is 20cm to 40cm.

6. The contaminated soil remediation apparatus of claim 5 wherein each set of second agitating plate sets (232) comprises a plurality of second agitating plates (2320), the plurality of second agitating plates (2320) being spaced apart along the circumferential direction of the second sleeve (202), an included angle between adjacent two of the second agitating plates (2320) being 15 degrees to 20 degrees.

7. The contaminated soil remediation apparatus of claim 5 wherein the desorption sleeve (20) further comprises:

the third sleeve (203) and the heat preservation sleeve (204) are sequentially connected, and the third sleeve (203) is connected with one end, far away from the first sleeve (201), of the second sleeve (202).

8. A contaminated soil remediation apparatus according to claim 7 wherein the heating mechanism (3) comprises:

a first burner group (31) arranged below the first sleeve (201) and communicating with the heating gap (22);

a second burner group (32) arranged below the second sleeve (202) and communicating with the heating gap (22);

a third burner group (33) arranged below the third sleeve (203) and communicating with the heating gap (22);

and a fourth burner group (34) which is arranged below the heat-preserving sleeve (204) and is communicated with the heating gap (22).

9. The contaminated soil remediation apparatus of claim 1 wherein the heating mechanism (3) further comprises a fume emission assembly (35), the fume emission assembly (35) comprising:

the device comprises a smoke transmission channel (350), a first transmission branch (3501) and a second transmission branch (3502), wherein one end of the smoke transmission channel (350) is communicated with a smoke source, and the other end of the smoke transmission channel (350) is respectively communicated with the first transmission branch (3501) and the second transmission branch (3502);

one end of the first transmission branch (3501) away from the flue gas transmission channel (350) is communicated with the preheating space (11), and one end of the second transmission branch (3502) away from the flue gas transmission channel (350) is communicated with the heating gap (22).

10. The contaminated soil remediation apparatus of claim 9 wherein the fume emission assembly (35) further comprises:

a first control valve (3503) disposed on the first transfer branch (3501) and in communication with the first transfer branch (3501);

and the smoke exhaust pipeline (352) is communicated with the smoke transmission channel (350), and a second control valve (3520) is arranged on the smoke exhaust pipeline (352).