CN109226225B - Novel modularized sequencing batch vacuum extraction thermal desorption treatment system and method - Google Patents
Novel modularized sequencing batch vacuum extraction thermal desorption treatment system and method Download PDFInfo
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- CN109226225B CN109226225B CN201810281243.5A CN201810281243A CN109226225B CN 109226225 B CN109226225 B CN 109226225B CN 201810281243 A CN201810281243 A CN 201810281243A CN 109226225 B CN109226225 B CN 109226225B
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/06—Reclamation of contaminated soil thermally
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/005—Extraction of vapours or gases using vacuum or venting
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Abstract
The invention discloses a novel modularized sequence a batch type vacuum extraction thermal desorption treatment system, the device comprises a soil matrix tray device (1), a multifunctional heating base device (2), a vacuum extraction device (3) and an integrated tail gas treatment device (4), wherein the soil matrix tray device (1) is used for storing and transporting polluted soil; the multifunctional heating base device (2) is used for carrying out heating desorption treatment on the polluted soil; the vacuum extraction device (3) is used for determining vacuum thermal desorption treatment process carrying out gas phase extraction on the polluted tail gas generated after the thermal desorption treatment; the integrated tail gas treatment device (4) is used for purifying the extracted polluted tail gas and discharging clean tail gas reaching the standard. The invention utilizes the technical principle of ectopic thermal desorption, and carries out rapid heating and extraction desorption treatment on the polluted soil under the vacuum condition, finally, the purification and the reutilization of the polluted soil are realized, and the method has good social benefit and economic benefit.
Description
Technical Field
The invention relates to the field of soil pollution treatment, in particular to a novel modularized sequencing batch vacuum extraction thermal desorption treatment system and method for pollution soil treatment.
Background
Along with the acceleration of the urban process, the adjustment of the industrial structure and the planning layout in China, a large number of enterprises with high consumption, high pollution, low benefit and lagged technology face to be moved, stopped or closed, and the pollution sites left after the enterprises are stopped and turned on leave serious environmental potential safety hazards for the subsequent land development, thereby becoming important factors for influencing and restricting the sustainable development of cities.
Data statistics show that hundreds of thousands of industrial sites with contaminated soil are in urgent need of repair and treatment at present, wherein the sites with contaminated organic substances account for more than half of the sites, and particularly the sites left after pesticide, chemical industry, coking, petroleum and electronic enterprises with long production history are moved. After the organic pollutants enter the soil environment in the field, the soil, the atmosphere and the water environment around the factory area can be further polluted in the forms of soil particles, rainfall leaching, groundwater migration and the like, and even the food chain enrichment can cause adverse effects on human bodies. In addition, with the expansion of towns, the acceleration of the urban process promotes the transformation of the original land functions, a large amount of land with industrial land properties changes the residential land, and the problem of soil pollution on the industrial land seriously affects the redevelopment and the utilization of the land and can cause great health hazard to future resident groups in the land.
The thermal desorption technology is to heat the soil polluted by the organic matters to a temperature above the boiling point of the organic matters in a heating mode, volatilize the organic matters adsorbed in the soil into a gaseous state and then carry out a separation treatment. The technology is one of the most thorough, efficient and practical technologies applied to the field of cleaning and repairing polluted soil, and can be widely applied to repairing and treating projects of volatile/semi-volatile organic polluted soil such as pesticides (hexa-hexa, drop nasal discharge and the like), petroleum hydrocarbon, polycyclic aromatic hydrocarbon, benzene series, polychlorinated biphenyl, dioxin and the like.
The thermal desorption technology has a great number of successful engineering application cases in developed countries abroad, but at present, the technical research, equipment research and development, engineering application and the like related to thermal desorption (including in-situ and ex-situ thermal desorption) in China are still in a starting development stage, and most of advanced thermal desorption equipment and systems which can be applied to actual engineering depend on import abroad, so that the thermal desorption equipment and the system are expensive and have the problem of difficult landing such as 'water and soil disuse'. Based on the current development situation of the industry, china provides a new planning policy in 2017, and thermal desorption equipment is taken as one of soil pollution repair technical equipment which is used for supporting research and development and important popularization and application in the five to ten years.
At present, the thermal desorption technology which can be applied to engineering practice in China comprises two types of in-situ thermal desorption technology and ex-situ thermal desorption technology, and the related technical equipment mainly comprises: rotary kiln direct/indirect thermal desorption equipment, cement kiln co-treatment equipment, spiral heaters, heating blankets, in-situ thermal desorption treatment systems and the like. The most widely used of the device is an ex-situ rotary kiln thermal desorption device and cement kiln co-treatment equipment, and the conventional thermal desorption devices have the following general defects or shortcomings as a whole:
1. the equipment occupies large area and has low adaptability to different size and type of fields.
2. The equipment mobility is poor, and contaminated soil often needs long distance transportation, and the transportation cost is high.
3. Most complete equipment relies on import, and monomer equipment cost is high, and the energy consumption in the operation period is big.
4. Adopts fuel gas or petroleum products as heating fuel, the potential safety risk during fuel transport and storage is high.
5. The heating mode from outside to inside is adopted, the internal heating is uneven, and the desorption efficiency is low.
6. The polluted soil is heated by the hot air generated by direct/indirect heating, so that the energy transmission efficiency is low, a large amount of dust is generated at the same time, and the tail gas dust removal pressure of subsequent equipment is increased.
7. The large rotary kiln thermal desorption technology needs longer preheating time to prevent the heating barrel from deforming, and also needs the same time to cool the system, and is long in time consumption and large in energy waste.
Disclosure of Invention
In order to solve the technical problems, the invention provides a novel modularized sequencing batch vacuum extraction thermal desorption treatment system and method.
The invention adopts the technical proposal for solving the problems that: the novel modularized sequencing batch vacuum extraction thermal desorption treatment system comprises a soil matrix tray device, a multifunctional heating base device, a vacuum extraction device and an integrated tail gas treatment device, wherein the soil matrix tray device is used for storing and transporting contaminated soil into the multifunctional heating base device; the multifunctional heating base device is used for carrying out heating desorption treatment on contaminated soil; the vacuum extraction device is used for ensuring that the thermal desorption treatment process of the multifunctional heating base device is in a vacuum state, and simultaneously carrying out vapor extraction on polluted tail gas generated after the thermal desorption treatment; the integrated tail gas treatment device is used for purifying the polluted tail gas extracted by the vacuum extraction device and discharging clean tail gas reaching standards.
Preferably, the soil matrix tray device comprises a soil matrix tray, a rotary baffle plate is arranged on one side of the soil matrix tray for loading and unloading soil, and a tray groove is formed in the bottom of the soil matrix tray.
The design standard capacity of the soil matrix tray device is 3m 3 -5m 3 Of course, the processing and customization can be carried out according to the requirements; the rotary baffle is connected with the soil matrix tray through a bearing, and can rotate for 0-180 degrees along the joint of the bearing to realize loading and unloading of soil; the tray groove can be convenient for the external fork truck to support the location when transporting soil matrix tray, realizes that the position between soil matrix tray and the fork truck is effectively fixed when fork truck transports.
Preferably, the multifunctional heating base device comprises a main body bearing unit, a heating unit, a temperature control unit and a hydraulic unit.
Preferably, the main body bearing unit comprises a heating base framework, a movable top cover plate arranged in the heating base framework and a front cover plate connected with the movable top cover plate, wherein a fixed handle is arranged on the front cover plate, a control switch is arranged on the heating base framework, a fixed groove is arranged at the bottom of the heating base framework, and a first vacuum pressure gauge and a safety air valve are arranged on the movable top cover plate.
The main body bearing unit is laterally L-shaped and is mainly used as a base to bear a soil matrix tray and a body bracket of the whole system, and the heating base framework, the movable top cover plate and the front cover plate can form a sealed heating cavity for heating and desorbing polluted soil in the soil matrix tray; a safety warning lamp is arranged at the top of the main body bearing unit and used for safety warning of night operation; the control switch is used for controlling the switch of the heating unit, the temperature control unit and the hydraulic unit; the heating base skeleton is filled with heat insulation materials for reducing heat energy external transmission and preventing operation safety problems caused by overhigh temperature of the heating base skeleton, the first vacuum pressure gauge is used for monitoring and displaying vacuum degree during working of the heating cavity, and the safety air valve can be used for manually adjusting pressure in the heating cavity in emergency.
Preferably, the heating unit includes an electric power distribution and protection box, a vertical heating rod, and a lateral heating rod, and the electric power distribution and protection box is connected with the vertical heating rod and the lateral heating rod and provides a heating power supply.
The utility model discloses a soil heating device, including main part bearing unit, vertical heating rod, horizontal heating rod, movable top apron, insulating flange, horizontal heating rod and vertical heating rod, vertical heating rod and horizontal heating rod top all is connected with, horizontal heating rod sets up in main part bearing unit bottom recess, can arrange according to the arbitrary quantity of demand, vertical heating rod fixes on the movable top apron in main part bearing unit, when the start is heated contaminated soil, horizontal heating rod and vertical heating rod can heat simultaneously from the bottom and the inside of contaminated soil respectively, realizes quick, effective, even will be heated contaminated soil to preset temperature.
Preferably, the temperature control unit comprises a temperature sensor and a temperature display, and the temperature sensor and the temperature display are connected with the main body bearing unit.
The temperature sensor shell has high thermal conductivity, is fixed on a movable top cover plate in the main body bearing unit, and is used for monitoring the temperature in the soil matrix tray in real time and carrying out digital display through the temperature display instrument.
Preferably, the hydraulic unit comprises a hydraulic oil pump, a hydraulic oil pipe and a hydraulic oil cylinder, one end of the hydraulic oil pipe is connected with the hydraulic oil pump, the other end of the hydraulic oil pipe is connected with the hydraulic oil cylinder, the hydraulic oil cylinder is connected with a hydraulic piston rod, and the hydraulic piston rod is connected with the main body bearing unit.
The movable top cover plate is driven by hydraulic pressure to move up and down along the vertical direction, and the up-and-down movement of the movable top cover plate and the front cover plate is convenient for an external forklift to transfer soil matrix trays before and after thermal desorption. In addition, when the top cover plate and the front cover plate are positioned at the lowest position, the vertical heating rod and the temperature sensor which are fixed on the top cover plate are directly pushed into the appointed position of the polluted soil by the hydraulic device so as to finish the preparation work before thermal desorption; when the top cover plate and the front cover plate are positioned at the highest position, the maintenance of the whole system device by workers can be facilitated, so that the performance stability of the multifunctional heating base device in the heating process is ensured.
The multifunctional heating base device can work together with a plurality of soil matrix tray devices in a sequencing batch mode, so that the tight connection of soil treatment processes of different batches is realized, and the engineering implementation efficiency is improved to the greatest extent.
Preferably, the vacuum extraction device comprises a quick connector, a high-temperature-resistant air pipeline connected with the quick connector, a vacuum pump arranged at one end of the high-temperature-resistant air pipeline, a second vacuum pressure gauge arranged on the high-temperature-resistant air pipeline, and a telescopic vertical pipe arranged on the vertical direction of the high-temperature-resistant air pipeline.
The plurality of second vacuum pressure gauges can be arranged at any position of the high-temperature-resistant air pipeline, which is required to monitor and display the vacuum degree, for example, the second vacuum pressure gauges are arranged near the vacuum pump and used for monitoring the vacuum degree at the front end of the high-temperature-resistant air pipeline in real time; a second vacuum pressure gauge is arranged near the quick connector and used for monitoring the vacuum degree of the tail end of the high-temperature-resistant air pipeline in real time; the high-temperature-resistant air pipeline is connected with the movable top cover plate in the main body bearing unit, and the telescopic vertical pipe is used for buffering connection when the high-temperature-resistant air pipeline moves up and down along with the movable top cover plate.
Preferably, the integrated tail gas treatment device comprises extremely cold cooling equipment, an induced draft fan, an activated carbon adsorption device and a connecting pipeline sequentially connected with the cold cooling equipment, the induced draft fan and the activated carbon adsorption device, and the tail end of the connecting pipeline is connected with a chimney.
The integrated tail gas treatment device adopts an integrated 'camera bellows' structural design, so that the whole module is convenient to move and overhaul;
the extremely cold cooling equipment adopts a circulating condensate water cooling mode to quickly cool the polluted gas desorbed from the polluted soil from high temperature to below 200 ℃, so that the generation of dioxin substances with stronger toxicity by high-temperature harmful tail gas in a slow cooling process is avoided, and on the other hand, the impact and damage of the tail gas temperature to a subsequent activated carbon adsorption device are eliminated;
the induced draft fan provides power for tail gas flow;
the active carbon adsorption device is used for carrying out clean adsorption on the tail gas after condensation cooling treatment; and the clean tail gas reaching the standard after being adsorbed by the activated carbon is discharged at high altitude through a chimney.
Further, a novel modularized sequencing batch vacuum extraction thermal desorption treatment method is provided, which comprises the following steps:
s01: loading the contaminated soil into a soil matrix tray device, and transporting the soil matrix tray device to a multifunctional heating base device through a forklift;
s02: the multifunctional heating base device is started and is ready to work before desorption is completed, a vertical heating rod and a transverse heating rod on the multifunctional heating base are electrified and heated to realize synchronous and uniform heating of the inside and the outside of the polluted soil, pollutants are volatilized from the polluted soil gradually in a gaseous form through thermal desorption, and a temperature control unit in the multifunctional heating base device monitors and maintains the temperature of the system in real time until the pollutants in the soil are thoroughly desorbed;
s03: the vacuum extraction device provides a vacuum environment for the multifunctional heating base device and continuously extracts desorbed pollutants to the subsequent integrated tail gas treatment device;
s04: purifying the gaseous pollutants extracted in vacuum by an integrated tail gas treatment device, and discharging the gaseous pollutants at high altitude after reaching standards;
s05: the clean soil after the thermal desorption treatment is kept in the soil matrix tray device, and then is removed, transported and unloaded to an external soil storage yard from the multifunctional heating base device through an external forklift, and the qualified standard soil after experience collection is reused according to actual needs.
The beneficial effects brought by the invention are as follows: by adopting the novel modularized sequencing batch vacuum extraction thermal desorption treatment system, the storage and transportation of polluted soil are realized through the soil matrix tray device by utilizing the ectopic thermal desorption technical principle; the polluted soil is heated and desorbed by using the multifunctional heating base device, and the pollution substances and the soil are thoroughly separated finally; the vacuum extraction device is utilized to provide a vacuum environment for thermal desorption treatment process to shorten the thermal desorption time, the desorbed gaseous pollutants are extracted to a subsequent integrated tail gas treatment device, the extracted gaseous pollutants are subjected to purification treatment, and then high-altitude discharge is carried out after reaching standards. The whole system has low pretreatment requirements on the polluted soil, can be suitable for most organic polluted soil, can be used by plug and play by taking electric energy as energy, can avoid potential safety hazards generated in the use process of traditional energy sources such as oil/gas and the like, and has very high safety and reliability.
The novel modularized sequencing batch vacuum extraction thermal desorption treatment method is simple in process flow, easy to operate and convenient to popularize and execute.
Compared with the prior art, the novel modularized sequencing batch vacuum extraction thermal desorption treatment system has the following obvious advantages:
1. the floor space is small, the adaptability to different size and type of sites is strong, the floor space is movable, and the floor space is easy to transport, assemble and overhaul;
2. the modular splice design can adapt to the implementation requirements of various engineering scale projects through any number of splice combinations of devices in the system;
3. the contaminated soil can be subjected to enhanced combined treatment of thermal desorption and vapor extraction under a vacuum environment, so that the boiling point of pollutants in the soil is greatly reduced under the vacuum condition, the process residence time of the thermal desorption is shortened, the engineering implementation efficiency is improved, and the equipment energy consumption is reduced;
4. the heating unit adopts the movable vertical heating rod and the fixed transverse heating rod to synchronously heat the polluted soil from the inside and the outside without disturbance, so that the uniformity of heat energy distribution can be effectively improved, the heating efficiency can be greatly improved, the polluted soil is quickly heated to a preset temperature, the soil dust is not generated in the heating process, and the tail gas treatment load is reduced;
5. a multifunctional heating base device can be matched with a plurality of soil matrix tray devices in a sequencing batch mode to realize tight connection of soil treatment processes of different batches, and engineering implementation efficiency is improved to the maximum.
Drawings
FIG. 1 is a schematic diagram of a novel modular sequencing batch vacuum extraction thermal desorption processing system;
FIG. 2 is a schematic cross-sectional view of the soil matrix tray device of FIG. 1 taken along line A-A;
FIG. 3 is a schematic view of the right side structure of the multi-functional heating base unit of FIG. 1;
fig. 4 is a schematic cross-sectional view of fig. 3 taken along line B-B.
Detailed Description
The invention is further described below with reference to the specific drawings.
As shown in fig. 1, a novel modularized sequencing batch vacuum extraction thermal desorption treatment system is provided, which sequentially comprises a soil matrix tray device 1, a multifunctional heating base device 2, a vacuum extraction device 3 and an integrated tail gas treatment device 4 from left to right;
as shown in fig. 2, the soil matrix tray device 1 comprises a soil matrix tray 11, a rotating baffle 12 is arranged on one side of the soil matrix tray 11 for loading and unloading soil, the rotating baffle 12 is connected with the soil matrix tray 11 through a bearing, and can rotate at any angle between 0 and 180 degrees along the joint of the bearing, two tray grooves 13 are formed in the bottom of the soil matrix tray 11, and the two tray grooves 13 correspond to two fork positions of an external forklift; the soil matrix tray is designed to be 3m 3 -5m 3 Standard capacity, and can be processed and customized according to the requirement. Multiple soil matrix trays may be loaded with different contaminated soils 10 for sequencing batch operations with the multi-function heating base assembly 2.
As shown in fig. 1 and 3, the multifunctional heating base device 2 includes a main body carrying unit, a heating unit, a temperature control unit, and a hydraulic unit: the main body bearing unit is laterally L-shaped and serves as a base to bear the soil matrix tray 11 and a machine body support of the whole system, the main body bearing unit comprises a heating base framework 210, a movable top cover plate 211 arranged in the heating base framework 210, a front cover plate 212 connected with the end part of the movable top cover plate 211, a fixed handle 213 (see figure 3) arranged on the front cover plate 212, the front cover plate 212 can be controlled to move up and down along the vertical direction by pulling the fixed handle 213, a control switch 214 is arranged on the left side of the heating base framework 210, the control switch 214 is used for controlling the heating unit, the temperature control unit and the hydraulic unit to start and stop, a safety warning lamp 216 is arranged on the top and can be used for night operation safety warning, a fixed groove 215 is arranged at the bottom of the heating base framework 210 and is convenient for fixing the whole machine body support, and a first vacuum pressure gauge 216 and a safety air valve 217 are arranged on the movable top cover plate 211.
As shown in fig. 3 and 4, the heating unit includes an electric power distribution and protection box 221, a vertical heating rod 222, and a transverse heating rod 223, the upper end of the vertical heating rod 222 is an insulating flange, the bottom is a cone, the inside of the vertical heating rod is an electric heating pipe, the outside of the electric heating pipe is wrapped by a high heat conduction alloy material, and a ceramic heat conduction material is filled between the electric heating pipe and the high heat conduction alloy material; the vertical heating rod 222 is directly connected to the movable top cover 211, the transverse heating rods 223 are arranged in parallel in the rectangular groove structure at the bottom of the main body bearing unit (see fig. 4), the power distribution and protection box 221 is used as electric power to supply heating power for the vertical heating rod 222 and the transverse heating rod 223, and the number of the vertical heating rod 222 and the number of the transverse heating rod 223 can be set according to the actual requirements of the equipment size and the working efficiency.
As shown in fig. 1, the temperature control unit mainly includes a temperature sensor 231 and a temperature display 232, wherein the temperature sensor 231 is wrapped by a high heat conduction protective casing with a certain rigidity, and is fixedly connected with a movable top cover plate 211 through an insulating flange, and the temperature display 232 is mounted on a front cover plate 212 for monitoring whether the temperature of the polluted soil 10 after being heated is within a preset range in real time and displaying in a digital manner.
As shown in fig. 1, 3 and 4, the hydraulic unit mainly comprises a hydraulic oil pump 241, a hydraulic oil pipe 242 and a hydraulic oil cylinder 243, wherein one end of the hydraulic oil pipe 242 is connected with the hydraulic oil pump 241, the other end is connected with the hydraulic oil cylinder 243 (see fig. 3), a hydraulic piston rod 244 is connected to the lower part of the hydraulic oil cylinder 243, the hydraulic piston rod 244 is connected with the movable top cover plate 211 (see fig. 1), and the movable top cover plate 211 is driven and controlled to move up and down by the piston type linear reciprocating motion of the hydraulic piston rod 244.
The heating unit of the multifunctional heating base device 2 is used for electrically heating and desorbing the polluted soil 10 by utilizing the principle of an ectopic thermal desorption technology until pollutants in the soil are thoroughly separated from the soil; the temperature control unit is used for monitoring whether the temperature in the whole heating process is within a preset temperature range in real time, so that the problem that the pollutant cannot be thoroughly volatilized and separated from the soil due to too low heating temperature is avoided; the hydraulic unit may control the movable top cover 211 and the front cover 212 within the heating base frame 210 to be opened upward or closed downward, and the movable top cover 211 to be opened upward or closed downward may be used to load and unload contaminated soil before the desorption starts or clean soil after the desorption is completed.
Of course, when the front cover plate 212 is moved to the highest position, the operator can conveniently overhaul the equipment structure arranged on the movable top cover plate 211, and when the front cover plate 212 is moved to the lowest position, the fixed handle 213 is pulled to fix and seal the structure with the fixed groove 215, so that a high-tightness heating cavity can be provided for the whole multifunctional heating base device 2.
As shown in fig. 1 and 3, wherein the vacuum extraction device comprises a quick connector 30 connected with a movable top cover plate 211, a high temperature resistant air pipe 31 connected with the quick connector 30, a telescopic vertical pipe 34 arranged in the vertical direction of the high temperature resistant air pipe 31, a vacuum pump 32 connected to the right side of the high temperature resistant air pipe 31, two second vacuum pressure gauges 33 (the number of which can be set according to the actual requirement) are arranged on the high-temperature-resistant air pipeline 31 and used for monitoring the vacuum degree of each section of structure in real time, and the second vacuum pressure gauges 33 arranged near the vacuum pump 32 are used for monitoring the vacuum degree of the front end of the high-temperature-resistant air pipeline 31 in real time; a second vacuum pressure gauge 33 is arranged near the quick connector 30 for monitoring the vacuum degree of the tail end of the high-temperature-resistant air pipeline 31 in real time (see fig. 1); the telescopic vertical pipe 34 is made of telescopic materials, and is mainly used for ensuring the effective connection and work of the whole system structure when the piston type hydraulic rod linearly reciprocates to drive the movable top cover plate 211 to move up and down, and the high-temperature-resistant air pipeline and the structure on the high-temperature-resistant air pipeline can correspondingly move up and down along with the high-temperature-resistant air pipeline. The vacuum environment can reduce the boiling point of soil pollutants, shorten the residence time and reduce the energy consumption on the one hand, and can continuously extract the desorbed gaseous pollutants by utilizing the high-low air pressure difference on the other hand, so as to strengthen the removal rate of the pollutants in the soil.
As shown in fig. 1, an integrated tail gas treatment device 4 with a 'camera bellows' type structural design is connected behind the vacuum extraction device, and comprises an extremely-cold cooling device 41, an induced draft fan 42, an activated carbon adsorption device 43 and a connecting pipeline 44 sequentially connected with the cold cooling device 41, the induced draft fan 42 and the activated carbon adsorption device 43, wherein the tail end of the connecting pipeline 44 is connected with a chimney 45, and the extremely-cold cooling device 41 is directly connected with a high-temperature-resistant air pipeline.
As shown in fig. 4, the heating base frame 210 is further filled with a heat insulating material 217 for reducing the external transmission of heat energy and preventing the operation safety problem caused by the over-high temperature of the heating base frame 210.
The novel modularized sequencing batch vacuum extraction thermal desorption treatment system disclosed by the invention works in the following manner:
the hydraulic unit is started by operating the control switch 214, the hydraulic oil pump 241 does work, the hydraulic piston rod 244 is connected to perform piston type linear motion upwards, meanwhile, the movable top cover plate 211 and the front cover plate 212 are driven to vertically move upwards to the highest position, the contaminated soil 10 is loaded in the soil matrix tray 11 by using the external loader until reaching the standard capacity, the pallet fork of the external forklift is clamped into the two tray grooves 13 at the bottom of the soil matrix tray 11, the external forklift supports the soil matrix tray 11 and transfers the soil matrix tray 11 into the multifunctional heating base device 2, the hydraulic unit is started again by operating the control switch 214, the hydraulic oil pump 241 does work, the hydraulic piston rod 244 is connected to perform piston type linear motion downwards, the vertical heating rod 222 on the movable top cover plate 211 and the temperature sensor 231 are driven to vertically enter the contaminated soil 10 to a designated depth, and the movable top cover plate 211 and the front cover plate 212 are fixed and sealed to form a heating cavity, so that the soil matrix tray 11 is in the fully sealed heating cavity. The vacuum extraction device 3 and the integrated tail gas treatment device 4 are started, the vacuum pump 32 is controlled to do work, and the numerical value on the second vacuum pressure gauge 33 is observed until the whole system is in a preset vacuum degree value interval and kept.
The control switch 214 is operated to activate the heating unit and the temperature control unit, the vertical heating rod 222 and the horizontal heating rod 223 are energized and heat the contaminated soil 10 to a preset temperature range, the thermal desorption process is started on the contaminated soil 10, the temperature sensor 231 monitors the internal temperature of the contaminated soil 10 in real time during heating, and the internal temperature is digitally displayed by the temperature display 232. The transverse heating rod 223 and the vertical heating rod 222 can synchronously and uniformly heat the bottom and the inside of the polluted soil 10, and as the temperature slowly rises, the soil pollutants in the soil matrix tray 11 begin to be gradually desorbed into gas and volatilize from the polluted soil 10, and the polluted soil 10 is kept at a set temperature and vacuum degree for a preset process residence time so as to ensure that the pollutants in the polluted soil 10 are thoroughly desorbed. In the process, the vacuum extraction device 3 continuously extracts the gaseous pollutants, the extracted gaseous pollutants enter the integrated tail gas treatment device 4 through the high-temperature-resistant air pipeline 31, in the integrated tail gas treatment device 4, the extremely cold cooling equipment 41 rapidly drops the polluted tail gas desorbed from the polluted soil 10 from high temperature to below 200 ℃ in a circulating condensate water cooling mode, the high-temperature harmful tail gas is prevented from generating dioxin substances with stronger toxicity in the slow cooling process, in the process, the induced draft fan 42 provides power for the flowing of the polluted tail gas, the whole polluted tail gas is pumped to flow from left to right, the polluted tail gas after the condensation cooling treatment enters the activated carbon adsorption device 43 for tail gas adsorption purification treatment, and the clean tail gas after the detection reaches the standard is discharged from a chimney 45 at high altitude.
After the contaminated soil 10 is subjected to thermal desorption treatment, a heating unit, a vacuum extraction device 3 and a tail gas treatment device 4 in the multifunctional heating device 2 are sequentially closed, the pressure of a heating cavity in the multifunctional heating base device 2 is recovered to be normal, a hydraulic oil pump 241 is controlled to apply work, a hydraulic oil cylinder 243 is connected with a hydraulic piston rod 244 to perform piston type linear motion upwards, meanwhile, a movable top cover plate 211 is driven to move upwards, a movable top cover plate 211 and a front cover plate 212 in a heating base skeleton 210 are opened, an external forklift is utilized to transfer the desorbed soil substrate tray 11 to an external soil storage yard, a rotary baffle 12 on one side of the soil substrate tray 11 where soil is loaded and unloaded is opened, the desorbed soil is all dumped to a designated position, and the cleaned soil is reused according to actual needs after detection acceptance.
During operation, the air relief valve 216 may be used to manually adjust the pressure of the heating cavity within the heating base skeleton 210 where the soil matrix pallet 11 is located in an emergency situation.
Further, a method corresponding to the novel modularized sequencing batch vacuum extraction thermal desorption treatment system is provided, and specifically comprises the following steps:
s01: loading the contaminated soil into a soil matrix tray device, and transporting the soil matrix tray device to a multifunctional heating base device through a forklift;
s02: the multifunctional heating base device is started and is ready to work before desorption is completed, a vertical heating rod and a transverse heating rod on the multifunctional heating base are electrified and heated to realize synchronous and uniform heating of the inside and the outside of the polluted soil, pollutants are volatilized from the polluted soil gradually in a gaseous form through thermal desorption, and a temperature control unit in the multifunctional heating base device monitors and maintains the temperature of the system in real time until the pollutants in the soil are thoroughly desorbed;
s03: the vacuum extraction device provides a vacuum environment for the multifunctional heating base device and continuously extracts desorbed pollutants to the subsequent integrated tail gas treatment device;
s04: purifying the gaseous pollutants extracted in vacuum by an integrated tail gas treatment device, and discharging the gaseous pollutants at high altitude after reaching standards;
s05: the clean soil after the thermal desorption treatment is kept in the soil matrix tray device, and then is removed, transported and unloaded to an external soil storage yard from the multifunctional heating base device through an external forklift, and the qualified standard soil after experience collection is reused according to actual needs.
While the invention has been described in detail in connection with specific preferred embodiments, it is not to be construed as limited to the specific embodiments of the invention, but rather as a matter of course, it will be understood by those skilled in the art that various modifications and substitutions can be made without departing from the spirit and scope of the invention.
Claims (1)
1. A novel modularized sequencing batch vacuum extraction thermal desorption treatment method is characterized in that: the method comprises the following steps:
s01: loading contaminated soil into a soil matrix tray device (1), and transporting the soil matrix tray device (1) to a multifunctional heating base device (2) through a forklift; the soil matrix tray device (1) comprises a soil matrix tray (11), a rotary baffle plate (12) is arranged on one side of the soil matrix tray (11) for loading and unloading soil, a tray groove (13) is formed in the bottom of the soil matrix tray (11), and the soil matrix tray (1) is 3m 3 -5 m 3 Standard capacity, can load different contaminated soil and multi-functional heating base device (2) to carry on the sequencing batch operation;
s02: the multifunctional heating base device (2) carries out thermal desorption treatment on contaminated soil in the transported soil matrix tray (11) by utilizing an ectopic thermal desorption technology until pollutants in the soil are thoroughly separated from the soil, and the multifunctional heating base device (2) comprises a main body bearing unit, a heating unit, a temperature control unit and a hydraulic unit; wherein:
the main body bearing unit comprises a heating base framework (210), a movable top cover plate (211) arranged in the heating base framework (210), a front cover plate (212) connected with the movable top cover plate (211), a fixed handle (213) arranged on the front cover plate (212), a control switch (214) arranged on the heating base framework (210), a fixed groove (215) arranged at the bottom of the heating base framework (210), and a first vacuum pressure gauge (216) and a safety air valve (217) arranged on the movable top cover plate (211);
the heating unit comprises an electric power distribution and protection box (221), a vertical heating rod (222) and a transverse heating rod (223), wherein the electric power distribution and protection box (221) is connected with the vertical heating rod (222) and the transverse heating rod (223) and provides a heating power supply; the upper end of the vertical heating rod (222) is an insulating flange, the bottom of the vertical heating rod is a cone, an electric heating pipe is arranged in the vertical heating rod, the outer part of the electric heating pipe is wrapped by a high heat conduction alloy material, a ceramic heat conduction material is filled between the electric heating pipe and the high heat conduction alloy material, and the vertical heating rod (222) is directly connected to the movable top cover plate (211);
the temperature control unit comprises a temperature sensor (231) and a temperature display instrument (232), and the temperature sensor (231) and the temperature display instrument (232) are connected with the main body bearing unit;
the hydraulic unit comprises a hydraulic oil pump (241), a hydraulic oil pipe (242) and a hydraulic oil cylinder (243), wherein one end of the hydraulic oil pipe (242) is connected with the hydraulic oil pump (241), the other end of the hydraulic oil pipe is connected with the hydraulic oil cylinder (243), the hydraulic oil cylinder (243) is connected with a hydraulic piston rod (244), and the hydraulic piston rod (244) is connected with the main body bearing unit;
the hydraulic oil pump (241) does work to realize the up-and-down movement of the movable top cover plate (211) and the front cover plate (212), and the concrete steps are as follows:
the hydraulic oil pump (241) does work, the hydraulic piston rod (244) is connected to perform piston type linear motion upwards, the movable top cover plate (211) and the front cover plate (212) are driven to vertically move upwards to the highest position, and the external forklift lifts the soil substrate tray (11) and transfers the soil substrate tray to the multifunctional heating base device (2);
the hydraulic oil pump (241) does work, the hydraulic piston rod (244) is connected to do piston type linear motion downwards, the vertical heating rod (222) on the movable top cover plate (211) and the temperature sensor (231) are driven to vertically enter the polluted soil to a designated depth, and the movable top cover plate (211) and the front cover plate (212) are fixed and sealed to form a heating cavity, so that the soil substrate tray (11) is positioned in the completely sealed heating cavity; the vertical heating rod (222) and the transverse heating rod (223) on the multifunctional heating base device (2) are electrified and heated to realize synchronous and uniform heating of the inside and the outside of the polluted soil, the pollutants are volatilized from the polluted soil gradually in a gaseous form through thermal desorption, and a temperature control unit in the multifunctional heating base device (2) monitors and maintains the temperature of the system in real time until the pollutants in the soil are thoroughly desorbed;
s03: the vacuum extraction device (3) provides a vacuum environment for the multifunctional heating base device (2), and continuously extracts pollutants desorbed by heating of the multifunctional heating base device (2) to the subsequent integrated tail gas treatment device (4); the vacuum extraction device (3) comprises a quick connector (30), a high-temperature-resistant air pipeline (31) connected with the quick connector (30), a vacuum pump (32) arranged at one end of the high-temperature-resistant air pipeline (31), a second vacuum pressure gauge (33) arranged on the high-temperature-resistant air pipeline (31), a telescopic vertical pipe (34) arranged in the vertical direction of the high-temperature-resistant air pipeline (31), wherein the telescopic vertical pipe (34) is made of telescopic materials and is mainly used for correspondingly moving the high-temperature-resistant air pipeline (31) and a structure on the high-temperature-resistant air pipeline up and down when a hydraulic piston rod (244) reciprocates up and down to drive a movable top cover plate (211) to move up and down, so that the effective connection and the work of the whole system structure are ensured;
s04: purifying the gaseous pollutants extracted in vacuum by an integrated tail gas treatment device (4), and discharging the gaseous pollutants at high altitude after reaching standards; the integrated tail gas treatment device (4) comprises extremely cold cooling equipment (41), an induced draft fan (42), an activated carbon adsorption device (43) and a connecting pipeline (44) sequentially connected with the extremely cold cooling equipment (41), the induced draft fan (42) and the activated carbon adsorption device (43), and the tail end of the connecting pipeline (44) is connected with a chimney (45);
s05: the clean soil after thermal desorption treatment is kept in the soil matrix tray device (1), and then is removed from the multifunctional heating base device (2), transported and unloaded to an external soil storage yard through an external forklift, and the qualified soil after experience collection is reused according to actual needs.
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| CN110976500A (en) * | 2019-12-12 | 2020-04-10 | 中科鼎实环境工程有限公司 | Modular thermal desorption treatment device for organic contaminated soil |
| CN111438173A (en) * | 2019-12-21 | 2020-07-24 | 江苏地质矿产设计研究院 | Device for treating organic pollutant soil |
| CN114515753B (en) * | 2022-01-20 | 2023-03-10 | 北京建工环境修复股份有限公司 | Heating unit, heating method and application of continuous indirect thermal desorption repair system |
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