CN112897084A - Device and method for conveying soil subjected to ex-situ thermal desorption by using fluidization tank - Google Patents

Abstract

The invention provides a device and a method for conveying soil subjected to ex-situ thermal desorption treatment by using a fluidization tank. The soil falls to the soil feed inlet at fluidization tank deck portion from thermal desorption equipment export after the dystopy thermal desorption is handled, and jar body bottom sets up the import of external air supply, sets up the soil discharge gate simultaneously, the conveying pipeline is connected to the soil discharge gate, the conveying pipeline conveys the soil backfill district nearby in the place. The gas outlet of the fluidization tank is connected with a cyclone dust collector, the gas separated by the cyclone dust collector can be discharged, and the soil recovered from the bottom of the cyclone dust collector is connected with the discharge pipeline of the fluidization tank. The beneficial effects are as follows: improve the raise dust that produces in the soil transportation process after the dystopy thermal desorption handles, avoid producing secondary pollution. Simultaneously, can be with the local backfill district of heterotopic thermal desorption back soil long distance transmission in place. The fluidization tank system can be matched with the ectopic thermal desorption equipment for use and can be repeatedly utilized.

Description

Device and method for conveying soil subjected to ex-situ thermal desorption by using fluidization tank

Technical Field

The invention relates to the technical field of thermal desorption treatment of soil, in particular to a device and a method for conveying soil subjected to ex-situ thermal desorption treatment by using a fluidized tank.

Background

The ectopic thermal desorption technology is a soil remediation technology which heats a target pollutant in the polluted soil to be above a boiling point of the target pollutant through direct or indirect heating, selectively promotes the pollutant to be gasified and volatilized by controlling the system temperature and the material retention time, and separates and removes the target pollutant from soil particles. Because the soil particles subjected to thermal desorption treatment are small, the problem of large dust raising exists during transportation by using a transport vehicle, and new secondary pollution is easily caused. At the same time, the health of the operators is also affected.

Disclosure of Invention

The invention aims to solve the technical problem of providing a device and a method for conveying soil subjected to ex-situ thermal desorption treatment by using a fluidized tank, which can effectively avoid dust emission and reduce secondary pollution.

In order to achieve the purpose, the invention adopts the following technical scheme:

a device for conveying soil subjected to ex-situ thermal desorption treatment by utilizing a fluidization tank comprises the fluidization tank, wherein the top of the fluidization tank is provided with a soil feeding hole and an air outlet after ex-situ thermal desorption treatment, the bottom of the fluidization tank is provided with an air inlet externally connected with an air source and a soil discharging hole externally connected with a landfill area in a field, the air outlet is connected with a cyclone separator, and the air inlet is connected with a circulating fan; the soil feeding hole, the air outlet, the air inlet and the soil discharging hole are respectively provided with a feeding valve, an exhaust valve, an air inlet valve and a discharging valve; a charge level indicator and a pressure gauge are arranged in the fluidization tank.

Further: an air outlet of the cyclone separator is connected with the atmosphere, and a soil outlet of the cyclone separator is connected with a landfill area in a field.

Further: and porous plates are arranged inside the fluidized tank and above the air inlet and used for uniformly distributing air.

Based on the device, the method for conveying the soil after the ectopic thermal desorption treatment by using the fluidized tank comprises the following steps:

step 1: opening a feed valve and an exhaust valve, allowing the soil subjected to the heterotopic thermal desorption treatment to enter a fluidization tank under the action of gravity, and releasing the air displaced in the fluidization tank through the exhaust valve;

step 2: when the soil in the fluidization tank reaches a set material level, closing the feeding valve and the exhaust valve, opening the circulating fan, and allowing high-pressure gas to enter through the bottom of the fluidization tank and be mixed with the soil in the fluidization tank to fluidize the soil;

and step 3: opening the discharge valve when the pressure of the fluidization tank reaches a set pressure value, and pressurizing the soil in the conveying pipeline in a flowing state until the soil in the fluidization tank and the conveying pipeline is completely emptied;

and 4, step 4: closing the discharge valve and the circulating fan, opening the exhaust valve, enabling the gas to enter the cyclone separator, discharging the separated air outwards, and connecting the separated soil to a soil discharge pipeline of the fluidization tank.

Has the advantages that: adopt the fluidization jar to carry the device of dystopy thermal desorption processing back soil, avoid the secondary pollution problems such as raise dust in the dystopy thermal desorption processing back soil transportation. Meanwhile, the fine particles of the soil are prevented from being sucked by operators, and occupational diseases are reduced.

Drawings

FIG. 1 is a schematic structural view of a fluidized tank for conveying soil after ex-situ thermal desorption treatment;

FIG. 2 is a schematic view of a multi-well plate;

wherein: 1-feeding hole of the soil after thermal desorption treatment; 2-a fluidization tank; 3-a perforated plate; 4-circulating fan; 5-a cyclone separator; 6-a soil discharging pipe; 7-an air outlet duct of the fluidization tank; 8-an air outlet duct of the cyclone; 9-air inlet of the fluidization tank; 10-a soil outlet pipe; 11-outlet on perforated plate.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

As shown in figure 1, an utilize fluidization jar to carry device of soil after dystopy thermal desorption handles, including fluidization jar 2, the jar body top of fluidization jar 2 sets up soil feed inlet 1 after the dystopy thermal desorption handles, jar body bottom is equipped with external air supply entry 9, one side on jar body upper portion is equipped with air outlet pipeline 7, cyclone 5 is connected to air outlet pipeline 7, cyclone 5's top air outlet pipeline 8 can arrange the air outward, cyclone 5's bottom soil outlet pipeline 10 is connected to the soil discharging pipe 6 of fluidization tank bottom, the soil is carried to the landfill district nearby in the place.

When the device is used, when the soil subjected to ex-situ thermal desorption treatment is discharged, the valve V1 on the soil discharge port at the top of the fluidized tank is opened. When the soil particles are full (controlled by level indicator I), soil inlet valve V1 is closed. The valve V7 on the outlet pipeline of the circulating fan is opened, and the air inlet V2 at the bottom of the fluidization tank is opened, so that the soil at the bottom of the fluidization tank 2 is fluidized. When the pressure in the fluidisation tank reaches a predetermined value (determined by the value of the pressure gauge P), the valve V3 at the bottom of the fluidisation tank is opened and the soil is transported to the backfill zone. After the feeding is finished, the valves V4, V5 and V6 on the cyclone separator are opened, wherein the separated soil is connected into a soil discharge pipe 6 of the fluidization tank, and the air separated by the cyclone separator 5 is discharged outside through an air outlet pipeline 8. The fluidization tank 2 is provided with a safety valve, and pressure is relieved when overpressure exists in the tank.

The working principle of the fluidized tank conveying ex-situ thermal desorption equipment is as follows: when the soil after the ex-situ thermal desorption treatment is added into the fluidization tank 2 through the valve V1 under the action of gravity, the air displaced in the fluidization tank 2 is released out through the exhaust valve V4, so that the soil is more easily fed. When the fluidization tank 2 is full (the soil is shown to reach 90% of the volume of the fluidization tank by the level indicator I), the feeding valve V1 and the exhaust valve 4 are closed, then the circulating fan 4 is opened, high-pressure gas enters through the bottom of the fluidization tank 2 and is uniformly distributed through the porous plate 3 inside the fluidization tank 2, the air entering the fluidization tank 2 is mixed with the soil, when the pressure of the fluidization tank 2 reaches a set value, the discharging valve V3 is opened, and at the moment, the soil is pressurized in a flowing state in the conveying pipeline until the soil in the fluidization tank and the conveying pipeline is completely emptied. After feeding is finished, the circulating fan and the air inlet valve are closed, the air exhaust valve is opened to exhaust air, the air outlet pipeline 7 is connected with the cyclone separator 5, the outlet pipeline at the top of the cyclone separator 5 can exhaust air, the soil outlet pipeline at the bottom of the cyclone separator is connected to the soil discharge pipe at the bottom of the fluidized tank, and soil is conveyed to a nearby landfill area in a field through a pipeline.

Claims (4)

1. A device for conveying soil subjected to ex-situ thermal desorption treatment by utilizing a fluidization tank is characterized by comprising the fluidization tank, wherein the top of the fluidization tank is provided with a soil feeding hole and an air outlet after ex-situ thermal desorption treatment, the bottom of the fluidization tank is provided with an air inlet externally connected with an air source and a soil discharging hole externally connected with a landfill area in a field, the air outlet is connected with a cyclone separator, and the air inlet is connected with a circulating fan; the soil feeding hole, the air outlet, the air inlet and the soil discharging hole are respectively provided with a feeding valve, an exhaust valve, an air inlet valve and a discharging valve; a charge level indicator and a pressure gauge are arranged in the fluidization tank.

2. The device for conveying soil after ectopic thermal desorption treatment by utilizing the fluidized tank as claimed in claim 1, is characterized in that: an air outlet of the cyclone separator is connected with the atmosphere, and a soil outlet of the cyclone separator is connected with a landfill area in a field.

3. The device for conveying soil after ectopic thermal desorption treatment by utilizing the fluidized tank as claimed in claim 1, is characterized in that: and porous plates are arranged inside the fluidized tank and above the air inlet and used for uniformly distributing air.

4. A method for conveying soil after ectopic thermal desorption treatment by using a fluidized tank based on the device of claim 1 is characterized in that: the method comprises the following steps:

step 1: opening a feed valve and an exhaust valve, allowing the soil subjected to the heterotopic thermal desorption treatment to enter a fluidization tank under the action of gravity, and releasing the air displaced in the fluidization tank through the exhaust valve;

step 2: when the soil in the fluidization tank reaches a set material level, closing the feeding valve and the exhaust valve, opening the circulating fan, and allowing high-pressure gas to enter through the bottom of the fluidization tank and be mixed with the soil in the fluidization tank to fluidize the soil;

and step 3: opening the discharge valve when the pressure of the fluidization tank reaches a set pressure value, and pressurizing the soil in the conveying pipeline in a flowing state until the soil in the fluidization tank and the conveying pipeline is completely emptied;

and 4, step 4: closing the discharge valve and the circulating fan, opening the exhaust valve, enabling the gas to enter the cyclone separator, discharging the separated air outwards, and connecting the separated soil to a soil discharge pipeline of the fluidization tank.

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