CN210010308U - A soil thermal desorption ex situ remediation system - Google Patents

Abstract

The utility model discloses a soil thermal desorption ectopic restoration system, which comprises a thermal desorption cylinder, a cyclone separator, a soil collection device, a tail gas burner and a preheating air supply device. The thermal desorption cylinder is provided with an ultrasonic generating device and a microwave heater, and the thermal desorption cylinder is connected with the preheating air supply device through an air supply pipe; the preheating air supply device includes an air inlet channel, a waste heat recovery device and a blower; a cyclone The bottom of the separator is communicated with the soil collection device, and the top of the cyclone separator is communicated with the air inlet of the tail gas burner through the tail gas pipeline. The utility model utilizes microwave heating technology, critical fluidization principle and ultrasonic cavitation principle to rapidly thermally desorb contaminated soil containing organic pollutants into qualified clean soil that can be backfilled. The organic tail gas produced by thermal desorption and auxiliary gas is completely burned into clean tail gas by the quadrangular tangential combustion method, and is discharged into the atmosphere through the waste heat recovery device. The soil and exhaust outlets are equipped with detection devices to ensure the safety and harmlessness of the products.

Description

A soil thermal desorption ex situ remediation system

technical field

The utility model relates to the field of environmental treatment, in particular to a soil thermal desorption ectopic restoration system.

Background technique

With the rapid development of science and technology, people's living standards and requirements for the living environment are also rising. The environmental problems brought about by the rapid development of science are becoming increasingly prominent, especially the unreasonable exploitation of mineral resources and their smelting discharge, long-term sewage irrigation and sludge application to the soil, and the unreasonable application of chemical fertilizers and pesticides. pollution problem. The content of harmful substances in vegetables and poultry produced from polluted soil exceeds the national standard by 10%-20%. It will take up to a hundred years for polluted soil to return to the normal standard naturally. The pollutants in the soil infiltrate through the rainwater and pollute the groundwater, causing secondary pollution with a wider range, greater harm and more difficult treatment.

Utility model content

The technical problem to be solved by the present utility model is aimed at the deficiencies of the above-mentioned prior art, and provides a soil thermal desorption ex situ remediation system, which utilizes a high temperature environment created by microwaves to remove soil pollutants. At the same time, the strong ultrasonic sound field is used to enhance the internal disturbance of the fluidized soil and enhance the desorption effect. The dust-containing harmful exhaust gas generated by thermal desorption is separated from the soil and gas, and the polluted gas is further processed to make it a harmless gas, and the air fed into the desorption cylinder is heated by the waste heat. Therefore, the utility model has the functions of protecting the environment and reducing energy consumption while improving the desorption effect.

In order to solve the above-mentioned technical problems, the technical scheme adopted by the present utility model is:

A soil thermal desorption ex situ remediation system comprises a thermal desorption cylinder, a cyclone separator, a soil collection device, a tail gas burner and a preheating air supply device.

A partition plate with holes is arranged in the thermal desorption cylinder, and a screw feeder is connected to the thermal desorption cylinder located above the partition plate, and the screw feeder is used to transport the soil to be repaired into the thermal desorption cylinder; The thermal desorption cylinder above the plate is also provided with an ultrasonic generating device and a microwave heater, and the thermal desorption cylinder located under the partition plate is connected to the preheating air supply device through an air supply duct.

The preheating air supply device includes an air inlet channel, a waste heat recovery device and a blower; the blower is arranged at one end of the air inlet channel, and the air outlet of the blower is connected with the air supply channel; the waste heat recovery device is arranged in the air inlet channel and is opposite to the air inlet direction. vertical.

The cyclone separator is connected with the thermal desorption cylinder located above the screw feeder through a transmission pipeline, the bottom of the cyclone separator is connected with the soil collection device, and the top of the cyclone separator is connected with the air inlet of the tail gas burner through a tail gas pipeline.

The outlet of the exhaust gas burner is communicated with the air inlet of the waste heat recovery device through a hot air duct, and an exhaust port directed to the atmosphere is arranged at the rear of the waste heat recovery device.

The ultrasonic generating device includes an ultrasonic generator, an ultrasonic working shaft and an inner cylinder; the inner cylinder is sleeved on the outer circumference of the ultrasonic working shaft, and the two ends of the inner cylinder and the ultrasonic working shaft are respectively connected with the partition plate and the top cover of the thermal desorption cylinder. connected, the ultrasonic working shaft can be rotated under the action of the driving device, and the ultrasonic generator is located in the inner cylinder and fixed on the ultrasonic working shaft.

The inner cylinder has a metal casing and is coated with microwave protective material.

The microwave heaters are evenly distributed on the inner wall surface of the thermal desorption cylinder located above the separator.

There are 12 microwave heaters in 4 groups, and each group has 3 microwave heaters evenly arranged vertically; wherein, the microwave heater in the middle is located at half the height of the thermal desorption cylinder above the partition plate.

A temperature sensor is arranged in the thermal desorption cylinder located above the separator, and the temperature sensor is electrically connected with the microwave heater.

An observation window is arranged on the thermal desorption cylinder.

The tail gas burner is a four-corner tangential burner.

A soil detector is provided in the soil collection device.

An exhaust gas detection device is arranged in the hot air duct.

The utility model has the following beneficial effects:

1. The present utility model utilizes the principle of critical fluidization to make the soil present a fluidized state, and strengthens the internal disturbance of the fluidized soil through the strong sound field of the ultrasonic wave, thereby enhancing the desorption effect; The fan does not need to change the wind speed, saving electricity.

2. In this utility model, the microwave heaters are evenly arranged in the inner wall of the upper cylinder of the thermal desorption cylinder, the temperature field inside the thermal desorption cylinder is evenly distributed, the desorption effect is enhanced, and the thermal stress caused by the uneven temperature on the equipment can be avoided at the same time. , to ensure work safety.

3. The utility model utilizes the different density of gas and soil, and can completely separate the polluted gas and soil in the cyclone separator to ensure the desorption effect.

4. The utility model adopts the four-corner tangential burner to treat the polluted gas, and the four airflows ignite each other, so that the polluted gas can be fully burned, the processing effect is strengthened, and the pollution of the environment is avoided.

5. The waste heat recovery device adopted by the utility model utilizes the waste heat of the harmless exhaust gas to heat the air fed into the thermal desorption cylinder, thereby improving the thermal desorption efficiency.

Description of drawings

Figure 1 shows a schematic structural diagram of a soil thermal desorption ectopic repair system of the present invention.

Figure 2 shows a specific perspective view of a soil thermal desorption ectopic restoration system of the present invention.

Figure 3 shows a schematic diagram of the exhaust pipe connection of the quadrangular tangential burner.

Figure 4 shows a schematic diagram of the structure of the waste heat recovery device.

Among them are: 1. Feed port; 2. Screw feeder; 3. Observation window; 4. Thermal desorption cylinder; 5. Temperature sensor; 6. Square pipe; 7. Cyclone separator; 8. Exhaust gas pipe; 9 , hot air duct; 10, four-corner tangential burner; 11, gas pipeline; 12, soil collection device; 13, exhaust gas detection device; 14, air inlet duct; 15, exhaust port; 16, blower; 17, air supply duct ; 18, slag discharge port; 19, soil detector; 20, auxiliary gas equipment; 21, clapboard; 22, ultrasonic working shaft; 23, inner cylinder; 24, upper cylinder inner shell; 25, ultrasonic generator; 26. Microwave heater; 27. Hot air duct; 28. Waste heat recovery device.

Detailed ways

The present utility model will be described in further detail below with reference to the accompanying drawings and specific preferred embodiments.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "left side", "right side", "upper", "lower part", etc. are based on the orientation or positional relationship shown in the accompanying drawings, only It is for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and "first", "second", etc. do not mean zero The importance of the components should not be construed as a limitation to the present invention. The specific dimensions used in this embodiment are only for illustrating the technical solution, and do not limit the protection scope of the present invention.

As shown in Figure 1, a soil thermal desorption ex situ remediation system includes a thermal desorption cylinder 4, a cyclone separator 7, a soil collection device 12, a tail gas burner 10 and a preheating air supply device.

The thermal desorption cylinder is preferably an upper cylinder, a rounded table cylinder and a lower cylinder which are arranged in order from top to bottom.

As shown in FIG. 2 , a partition plate 21 with a circular hole is preferably arranged in the thermal desorption cylinder, and the partition plate and the thermal desorption cylinder are preferably detachably installed at the intersection of the upper cylinder and the rounded table cylinder.

A screw feeder is connected to the thermal desorption cylinder located above the partition plate, that is, the screw feeder 2 is arranged in the upper cylindrical part of the thermal desorption cylinder, and is used to transport the soil to be repaired into the thermal desorption cylinder, The feed port 1 is located at the left end of the screw feeder 2.

An ultrasonic generating device and a microwave heater 26 are also arranged in the thermal desorption cylinder (ie, the upper cylinder) located above the separator.

The microwave heaters are preferably evenly distributed on the inner shell 24 of the upper cylinder. As shown in FIG. 2 , there are preferably 12 microwave heaters in 4 groups, and each group has 3 microwave heaters that are evenly arranged vertically; The microwave heater height is located at half the height of the thermal desorption cylinder above the baffle.

The ultrasonic generating device includes an ultrasonic generator 25, an ultrasonic working rotating shaft 22 and an inner cylinder 23; the inner cylinder is sleeved on the outer circumference of the ultrasonic working rotating shaft, and the two ends of the inner cylinder and the ultrasonic working rotating shaft are respectively connected with the partition plate and the thermal desorption cylinder. The top cover is connected, the ultrasonic working shaft can be rotated under the action of a driving device (preferably a motor, etc.), and the ultrasonic generator is located in the inner cylinder and fixed on the ultrasonic working shaft.

Further, a temperature sensor 5 is also arranged in the upper cylinder, and the temperature sensor is electrically connected to the microwave heater. The probe of the temperature sensor 5 is preferably located at the inner shell 24 of the upper cylinder, and is adjacent to the interface of the square pipe 6 .

Further, an observation window 3 is also provided on the thermal desorption cylinder.

Further, the above-mentioned inner cylinder preferably has a metal outer shell and is coated with a microwave protective material.

The bottom of the lower cylinder of the thermal desorption cylinder is provided with a slag discharge port 18 .

The thermal desorption cylinder (that is, the rounded table) located under the partition plate is connected to the preheating air supply device through the air supply duct 17 .

As shown in Figures 2 and 4, the preheating air supply device includes an air inlet channel 14, a waste heat recovery device 28 and a blower 16; the blower is arranged at one end of the air inlet channel, and the air outlet of the blower is connected to the air supply channel; the waste heat recovery device 28 The main body is a heat exchange tube, and the waste heat recovery device is arranged in the air inlet channel and is perpendicular to the air inlet direction.

The cyclone separator is connected to the thermal desorption cylinder located above the screw feeder through a transmission pipe, which is preferably a square pipe 6 . The bottom of the cyclone is communicated with a soil collection device 12, and a soil detection device 19 is preferably provided in the soil collection device. The top of the cyclone separator is communicated with the air inlet of the exhaust gas burner through the exhaust gas pipeline 8 .

The outlet of the exhaust gas burner is communicated with the air inlet of the waste heat recovery device through the hot air duct 9, and the exhaust gas detection device 13 is preferably arranged in the hot air duct;

The above-mentioned exhaust gas burner is preferably a quadrangular tangential burner 10 , and a schematic diagram of the connection of the exhaust gas pipeline is shown in FIG. 3 . Among them, the quadrangular tangential burner 10 is preferably connected to the upper outlet of the cyclone separator 7 through the gas pipeline 11 and the exhaust gas pipeline 8 . A round hole is opened on the top surface of the four-corner tangential burner 10 to be connected to the exhaust gas detection device 13 through the hot air duct 9 .

The working principle of the utility model is as follows:

The collected polluted soil to be repaired is put into the feed port 1 and sent into the cavity of the thermal desorption cylinder 4 through the screw feeder 2, and the blower 16 inputs high-speed airflow into the cavity of the thermal desorption cylinder 4 through the air supply duct 17. , the ultrasonic generator 25 rotates around the ultrasonic working shaft 22 and emits ultrasonic waves. Based on the principle of critical fluidization, the soil exhibits fluid properties in high-speed airflow, and the soil is relatively evenly distributed in the cavity of the thermal desorption cylinder 4; the strong sound field of ultrasonic waves is used to break up the soil blocks and enhance the fluidization of the soil. Internal disturbance. Using the microwave heating principle, the microwave heaters 26 evenly distributed along the outer wall of the inner shell 24 of the upper cylinder rapidly heat the fluidized soil, and then the temperature sensor feedback adjusts the microwave frequency to make the heating temperature in an ideal state to achieve rapid thermal desorption. The thermally desorbed contaminated soil enters the cyclone separator through the square pipe 6 by high-speed airflow. A small amount of soil that has not entered the square pipe 6 can be transported out from the slag discharge port 18 and put back into the screw feeder 2 after the equipment stops running. For the protection of the equipment, the inner cylinder 23 connected to the top surface of the upper cylinder should be a metal shell and coated with microwave protection materials to avoid the thermal damage and the ultrasonic heating of the ultrasonic generator 25 in the inner cylinder 23 caused by microwave heating. Electromagnetic damage; the outer wall of the inner shell 24 of the upper cylinder should be coated with an ultrasonic absorption coating to avoid the vibration damage of the microwave heater 26 by ultrasonic waves. This process can be monitored through the viewing window 3 .

After the thermally desorbed polluted soil is separated by the cyclone separator 7, the soil falls into the soil collection device 12 and is detected by the soil detector 19. If it is qualified, it will be collected and backfilled. 2. It is sent into the inner cavity of the thermal desorption cylinder 4 for reheating desorption; the harmful exhaust gas is mixed with the auxiliary gas provided by the auxiliary gas equipment 19 from the gas outlet of the cyclone separator 7 and the auxiliary gas provided by the auxiliary gas equipment 19, and then enters the four corners along the gas pipeline 11. The tangential-circle burner 10 performs high-temperature combustion treatment. The burner 10 adopts the four-corner tangential-circle combustion method to process the exhaust gas. Any airflow deviates from its center line by 7° and is tangent to the imaginary circle. Treatment effect, avoid polluting the environment.

The fully combusted exhaust gas becomes harmless exhaust gas through the hot air duct 9 and is connected to the exhaust gas detection device 13 . The qualified exhaust gas enters the waste heat recovery device 28 through the hot air duct 27 , exchanges heat with the cold air duct 14 to realize waste heat recovery, and pumps the heated air into the air supply duct, and finally the qualified exhaust gas is discharged from the exhaust port 15 .

The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above-mentioned embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention. , these equivalent transformations all belong to the protection scope of the present invention.

Claims (10)

1. a soil thermal desorption ex situ repair system, is characterized in that: comprise thermal desorption cylinder, cyclone separator, soil collecting device, tail gas burner and preheating air supply device; A partition plate with holes is arranged in the thermal desorption cylinder, and a screw feeder is connected to the thermal desorption cylinder located above the partition plate, and the screw feeder is used to transport the soil to be repaired into the thermal desorption cylinder; The thermal desorption cylinder above the plate is also provided with an ultrasonic generating device and a microwave heater, and the thermal desorption cylinder located under the baffle is connected to the preheating air supply device through an air supply pipe; The preheating air supply device includes an air inlet channel, a waste heat recovery device and a blower; the blower is arranged at one end of the air inlet channel, and the air outlet of the blower is connected with the air supply channel; the waste heat recovery device is arranged in the air inlet channel and is opposite to the air inlet direction. vertical; The cyclone separator is connected with the thermal desorption cylinder located above the screw feeder through the transmission pipeline, the bottom of the cyclone separator is communicated with the soil collection device, and the top of the cyclone separator is communicated with the air inlet of the exhaust gas burner through the exhaust gas pipeline; The outlet of the exhaust gas burner is communicated with the air inlet of the waste heat recovery device through a hot air duct, and an exhaust port directed to the atmosphere is arranged at the rear of the waste heat recovery device. 2. The soil thermal desorption ectopic repair system according to claim 1 is characterized in that: the ultrasonic generating device comprises an ultrasonic generator, an ultrasonic working rotating shaft and an inner cylinder; The two ends of the cylinder and the ultrasonic working shaft are respectively connected with the partition plate and the top cover of the thermal desorption cylinder. The ultrasonic working shaft can rotate under the action of the driving device, and the ultrasonic generator is located in the inner cylinder and fixed on the ultrasonic working shaft. 3 . The soil thermal desorption ex situ restoration system according to claim 2 , wherein the inner cylinder has a metal shell and is coated with microwave protection materials. 4 . 4 . The soil thermal desorption ex situ restoration system according to claim 1 , wherein the microwave heaters are evenly distributed on the inner wall surface of the thermal desorption cylinder located above the partition plate. 5 . 5. The soil thermal desorption ex situ repair system according to claim 4, characterized in that: there are 12 microwave heaters in 4 groups, and each group has 3 microwave heaters that are evenly arranged vertically; The microwave heater height is located at half the height of the thermal desorption cylinder above the baffle. 6 . The soil thermal desorption ex situ restoration system according to claim 1 , wherein a temperature sensor is arranged in the thermal desorption cylinder above the partition, and the temperature sensor is electrically connected to the microwave heater. 7 . 7 . The soil thermal desorption ex situ restoration system according to claim 1 , wherein an observation window is provided on the thermal desorption cylinder. 8 . 8 . The soil thermal desorption ex situ remediation system according to claim 1 , wherein the tail gas burner is a quadrangular tangential burner. 9 . 9 . The soil thermal desorption ex situ remediation system according to claim 1 , wherein a soil detector is arranged in the soil collection device. 10 . 10 . The soil thermal desorption ex situ restoration system according to claim 1 , wherein a tail gas detection device is arranged in the hot air duct. 11 .

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