Soil remediation integrated equipment based on ex-situ chemical heating thermal desorption method

Abstract

The utility model relates to soil remediation integrated equipment based on an ex-situ chemical heating thermal desorption method, and relates to the technical field of soil remediation, the equipment comprises a spiral conveyor, a heating mechanism and a tail gas treatment mechanism, and further comprises a filtering assembly arranged at the joint of the tail gas treatment mechanism and the spiral conveyor, the rotating shaft is arranged on the spiral conveyor, is arc-shaped and is propped against the rotating part of the spiral conveyor; and the collecting cover is arranged on the spiral conveyor, covers the filter screen and is communicated with the tail gas treatment mechanism. Flue gas is filtered through a filter screen and then enters the tail gas treatment mechanism, so that the number of impurities entering the tail gas treatment mechanism is greatly reduced, the soil remediation effect and efficiency are improved, meanwhile, a spiral conveyor can scrape adhered soil on the filter screen when rotationally conveying the soil, and the soil remediation efficiency is improved. And therefore, the speed of flue gas passing through the filter screen is further increased, and the soil remediation effect and efficiency are further improved.

Description

Technical Field

[0001] The present application relates to the technical field of soil remediation, and in particular to an integrated soil remediation device based on an ex situ chemical heating thermal desorption method. Background Art

[0002] Thermal desorption is a method for remediating volatile / semi-volatile organic pollution in industrial sites. By heating the contaminated soil to a certain temperature, volatile / semi-volatile organic pollutants evaporate and separate from the soil, allowing the soil to be purified. Compared with other technologies, thermal desorption has the advantages of high efficiency, rapidity and safety.

[0003] During the thermal desorption process, evaporation, distillation, boiling, oxidation and pyrolysis occur. Some organic pollutants in the soil are decomposed at high temperatures, and the pollutants that cannot be decomposed are separated from the soil to form flue gas, which is then purified. The thermal desorption technology is specifically manifested in the actual application process as: the pollutants are volatilized from the contaminated soil at high temperature and transferred into the flue gas, and the pollutants in the flue gas are purified.

[0004] In the prior art, in order to reduce the size of the equipment, the equipment is generally integrated. The integrated equipment of the thermal desorption method includes a heating mechanism, a screw conveyor, and an exhaust gas treatment mechanism that are interconnected. The heating mechanism introduces hot air into the screw conveyor, and soil is added to the screw conveyor for transportation, so that the pollutants in the soil are decomposed and volatilized to form flue gas, and the flue gas enters the exhaust gas treatment mechanism for treatment. Since fine particles and impurities in the soil are easily entered into the exhaust gas treatment mechanism along with the flue gas, the treatment pressure of the subsequent exhaust gas treatment mechanism is increased, thereby reducing the soil repair effect. Utility Model Content

[0005] In order to improve the soil remediation effect, the present application provides an integrated soil remediation device based on an ex situ chemical heating thermal desorption method.

[0006] The integrated soil remediation equipment based on the ex situ chemical heating thermal desorption method provided in this application adopts the following technical solutions:

[0007] The integrated soil remediation equipment based on the ex situ chemical heating thermal desorption method comprises a screw conveyor, a heating mechanism and an exhaust gas treatment mechanism, and also comprises a filter assembly arranged at the connection between the exhaust gas treatment mechanism and the screw conveyor, wherein the filter assembly comprises:

[0008] A filter screen, which is arranged on the screw conveyor and is arc-shaped and conflicts with the rotating part of the screw conveyor;

[0009] The collecting hood is arranged on the screw conveyor and covers the filter screen and is connected with the tail gas treatment mechanism.

[0010] By adopting the above technical solution, soil is added to the screw conveyor and conveyed, and the heating mechanism introduces hot air into the screw conveyor to heat the soil to a certain temperature (the temperature is greater than the highest boiling point of all pollutants), so that the pollutants in the soil are decomposed to form flue gas, and at the same time, the movement of hot air also drives the movement of the soil. The flue gas passes through the filter and enters the collection hood, and then the flue gas enters the exhaust gas treatment mechanism, thereby greatly reducing the amount of impurities entering the exhaust gas treatment mechanism, making the flue gas treatment more efficient, and improving the soil repair effect and efficiency. At the same time, the screw conveyor can also scrape the soil adhered to the filter when rotating to convey the soil, thereby further accelerating the rate at which the flue gas passes through the filter, and further improving the soil repair effect and efficiency.

[0011] Optionally, the screw conveyor includes a conveying pipe, a feeding hopper, a screw conveying plate and a discharge pipe, wherein the feeding hopper is arranged at one end of the conveying pipe and is used to add soil into the conveying pipe, the screw conveying plate is rotatably installed on the conveying pipe and is used to convey the soil to move and conflict with the filter screen, and the discharge pipe is arranged at one end of the conveying pipe away from the feeding hopper and is used to discharge the soil in the conveying pipe.

[0012] By adopting the above technical solution, soil is added into the conveying pipe through the feeding hopper, and at the same time, the spiral conveying piece rotates to push the soil to move, and hot air is passed into the conveying pipe for heating, so that pollutants in the soil form smoke overflow, and the treated soil is discharged through the discharge pipe.

[0013] Optionally, a mounting hole for the filter screen to be snap-fitted is provided on the conveying pipe, and the mounting hole and the filter screen both extend from the feeding hopper to the discharge pipe.

[0014] By adopting the above technical solution, the area through which smoke passes is increased, thereby further accelerating the rate at which smoke passes, thereby improving the soil repair effect and efficiency.

[0015] Optionally, the collection hood is provided with a recoil assembly for cleaning the filter screen, and the recoil assembly comprises:

[0016] An output pipe, wherein the output pipe is arranged on the collecting cover;

[0017] The first tube body and the second tube body are connected to the delivery pipe through a three-way valve and are communicated with the heating mechanism and the exhaust gas treatment mechanism respectively. The three-way valve controls the output pipe to communicate with the first tube body or the second tube body.

[0018] By adopting the above technical solution, when the filter is in a normal state, the three-way valve controls the output pipe to be connected with the second pipe body, thereby filtering the flue gas; when the filter is blocked and the passage of the flue gas is slowed down, the filter needs to be cleaned, the addition of soil in the hopper is reduced or stopped, the three-way valve controls the output pipe to be connected with the first pipe body, the screw conveyor continues to run, and the hot air enters the collection hood through the output pipe to reversely clean the filter, so that the impurities blocked in the filter fall off, and the hot air entering can continue to heat the soil. After the cleaning is completed, the three-way valve controls the output pipe to be connected with the second pipe body, thereby continuing to filter the flue gas normally, further improving the soil repair effect and efficiency.

[0019] Optionally, the heating mechanism includes:

[0020] An input pipe, the bottom end of which is arranged on the feeding hopper and the top end of which is arranged obliquely upward;

[0021] An inlet pipe is arranged on the top end of the inlet pipe and is used to input hot air.

[0022] By adopting the above technical solution, hot air enters the feeding hopper through the inlet pipe and the input pipe in sequence, so the hot air blows the soil downward at an angle to the conveying pipe, making it easier to add the soil in the feeding hopper to the conveying pipe, and also allowing the hot air to contact the soil one step in advance, thereby extending the heating time of the hot air on the soil and improving the repair effect and efficiency of the soil.

[0023] Optionally, the feeding hopper is provided with a crushing mechanism, and the crushing mechanism comprises:

[0024] A plurality of crushing pieces, which are rotatably arranged on the feeding hopper and cooperated to crush the soil;

[0025] A driving assembly is arranged on the hopper and is used for driving a plurality of shredded pieces to rotate and making two adjacent shredded pieces rotate in opposite directions.

[0026] By adopting the above technical solution, the driving component starts to drive the multiple crushing pieces to rotate to crush and loosen the soil, so that the hot air can heat the soil more easily to remove pollutants, thereby improving the soil repair effect and efficiency.

[0027] Optionally, the driving component includes:

[0028] A plurality of gears, wherein the plurality of gears are respectively arranged on the plurality of crushing pieces and two adjacent gears are meshed with each other;

[0029] A driving member is arranged on the feeding hopper and is used for driving one of the shredded pieces to rotate.

[0030] By adopting the above technical solution, the driving member starts to drive one of the pulverizing pieces and the gear located thereon to rotate, and the rotating gear drives other gears and pulverizing pieces to rotate, thereby driving multiple stirring pieces to rotate and the rotation directions of two adjacent pulverizing pieces are opposite.

[0031] Optionally, the exhaust gas treatment mechanism includes:

[0032] A cyclone dust collector, the cyclone dust collector is used to be connected to the collection hood and to remove dust from the flue gas;

[0033] The adsorption tower is connected to the cyclone dust collector and is used for adsorbing the flue gas after dust removal.

[0034] By adopting the above technical solution, the cyclone dust collector first removes impurities in the flue gas, and then performs adsorption treatment through the adsorption tower, thereby achieving flue gas treatment and improving the soil repair effect.

[0035] In summary, the present application includes at least one of the following beneficial technical effects:

[0036] The flue gas is filtered through the filter and then enters the exhaust gas treatment mechanism for treatment, thereby greatly reducing the amount of impurities entering the exhaust gas treatment mechanism and improving the soil repair effect and efficiency. In addition, the screw conveyor can also scrape the soil adhered to the filter when rotating to transport the soil, thereby further accelerating the rate at which the flue gas passes through the filter and further improving the soil repair effect and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a three-dimensional structural schematic diagram of the present application;

[0038] Figure 2 It is a partial structural diagram of the present application, with the output pipe and filter assembly exploded.

[0039] Figure numerals: 1. screw conveyor; 11. conveying pipe; 12. screw conveying sheet; 13. discharge pipe; 14. mounting hole; 15. fixed motor; 2. feeding hopper; 21. connecting pipe; 22. flared end; 3. crushing mechanism; 31. crushing pieces; 32. stirring shaft; 4. driving assembly; 41. gear; 5. heating mechanism; 51. input pipe; 52. inlet pipe; 6. filtering assembly; 61. filter screen; 62. collecting hood; 7. recoil assembly; 71. output pipe; 72. first pipe body; 73. second pipe body; 74. three-way valve; 8. exhaust gas treatment mechanism; 81. cyclone dust collector; 82. adsorption tower. DETAILED DESCRIPTION

[0040] The following is combined with Figure 1-2 This application is described in further detail.

[0041] The embodiments of the present application disclose an integrated soil remediation device based on an ex situ chemical heating thermal desorption method.

[0042] Reference Figure 1 The integrated soil remediation equipment based on the ex situ chemical heating thermal desorption method includes a screw conveyor 1, a heating mechanism 5 and an exhaust gas treatment mechanism 8, and also includes a filter component 6 arranged at the connection between the exhaust gas treatment mechanism 8 and the screw conveyor 1, and the filter component 6 is used to filter impurities in the flue gas entering the exhaust gas treatment mechanism 8.

[0043] Reference Figure 1 and Figure 2 The screw conveyor 1 includes a conveying pipe 11, a feeding hopper 2, a screw conveying sheet 12 and a discharge pipe 13. The conveying pipe 11 is in a horizontal state. The feeding hopper 2 includes a connecting pipe 21 and a flared end 22. The connecting pipe 21 is fixedly installed at the highest point of one end of the conveying pipe 11, and the connecting pipe 21 is vertically arranged upward. The flared end 22 is integrally arranged at the top of the connecting pipe 21 and is outwardly expanded. The feeding hopper 2 is used to add soil into the conveying pipe 11; the screw conveying sheet 12 is coaxially rotatably installed in the conveying pipe 11, and the screw conveying sheet 12 abuts against the inner wall of the conveying pipe 11. A fixed motor 15 connected to the screw conveying sheet 12 is fixedly installed at one end of the conveying pipe 11 close to the feeding hopper 2. The fixed motor 15 is used to drive the screw conveying sheet 12 to rotate, so as to realize the conveying of soil; the discharge pipe 13 is fixedly installed at the lowest point of the conveying pipe 11 away from the end of the feeding hopper 2, and the discharge pipe 13 is vertically arranged downward, and the discharge pipe 13 is used to output the soil in the conveying pipe 11.

[0044] The feeding hopper 2 is provided with a crushing mechanism 3 for crushing the soil, and the crushing mechanism 3 includes a plurality of crushing pieces 31 and a driving assembly 4. The plurality of crushing pieces 31 are arranged horizontally or vertically at intervals and cooperate with each other to crush the soil. The crushing pieces 31 are rotatably mounted on the flared end 22 through a stirring shaft 32, and the stirring shaft 32 is rotatably mounted on the flared end 22 and is in a horizontal state; the driving assembly 4 is arranged on the flared end 22 and is used to drive the plurality of crushing pieces 31 to rotate simultaneously and make the rotation directions of two adjacent crushing pieces 31 opposite.

[0045] The driving assembly 4 includes a plurality of gears 41 and a driving member. The plurality of gears 41 are arranged in one-to-one correspondence with the plurality of stirring shafts 32. The gear 41 is keyed to one end of the stirring shaft 32 passing through the flared end 22, and the gears 41 on two adjacent stirring shafts 32 mesh with each other, so that the two adjacent pulverizing pieces 31 rotate in opposite directions. The driving member is a driving motor, which is fixedly mounted on the outer wall of the flared end 22 away from the gear 41. The driving member is connected to one of the stirring shafts 32 and is used to drive the stirring shaft 32 to rotate. The driving member starts to drive the plurality of pulverizing pieces 31 to rotate simultaneously to pulverize the soil.

[0046] The heating mechanism 5 is arranged on the hopper 2 and is used to input hot air into the conveying pipe 11, so as to heat the soil; the heating mechanism 5 includes an input pipe 51 and an inlet pipe 52, the bottom end of the input pipe 51 is fixedly mounted on the side wall of the connecting pipe 21, and the top end of the input pipe 51 is inclined upward, the inlet pipe 52 is integrally arranged on the top end of the input pipe 51 and is used to input hot air, and the hot air enters the connecting pipe 21 through the input pipe 51 and the inlet pipe 52, so that the hot air blows the soil obliquely downward into the conveying pipe 11 and heats the soil at the same time, so that the pollutants in the soil are decomposed to form smoke.

[0047] The filter assembly 6 includes a filter screen 61 and a collecting cover 62. A mounting hole 14 is provided at the highest point of the conveying pipe 11 and on the side of the feeding hopper 2 close to the discharge pipe 13. The mounting hole 14 extends from the feeding hopper 2 along the axis of the conveying pipe 11 to directly above the discharge pipe 13. The filter screen 61 is snap-fitted and mounted on the mounting hole 14. The filter screen 61 is arc-shaped and the center of the circle is located on the axis of the conveying pipe 11. The filter screen 61 is used to filter impurities in the flue gas. At the same time, the spiral conveying sheet 12 rests on the lower surface of the filter screen 61. When the spiral conveying sheet 12 rotates, it can scrape off impurities adhering to the filter screen 61, thereby accelerating the rate at which the flue gas passes through the filter screen 61.

[0048] The collecting hood 62 is fixedly installed at the highest point of the conveying pipe 11, and the filter screen 61 is located in the collecting hood 62, so that the collecting hood 62 and the filter screen 61 both extend from the feeding hopper 2 to just above the discharge pipe 13, thereby maximizing the area through which the flue gas passes. The collecting hood 62 is connected to the exhaust gas treatment mechanism 8, and the collecting hood 62 is used to collect the filtered flue gas, and then the flue gas is passed into the exhaust gas treatment mechanism 8 for treatment.

[0049] Reference Figure 1 and Figure 2 A recoil assembly 7 for cleaning the filter screen 61 is provided on the collection cover 62. The recoil assembly 7 includes an output pipe 71, a first pipe body 72 and a second pipe body 73. The output pipe 71 is fixedly mounted on the upper surface of the collection cover 62 and is vertically arranged upward. The first pipe body 72 and the second pipe body 73 are connected to the delivery pipe 11 through a three-way valve 74. The three-way valve 74 controls the output pipe 71 to be connected to the first pipe body 72 or the second pipe body 73. The first pipe body 72 is connected to the inlet pipe 52, and the second pipe body 73 is connected to the exhaust gas treatment mechanism 8.

[0050] When the soil is repaired normally, the three-way valve 74 controls the output pipe 71 to be connected only to the second pipe body 73. When the filter screen 61 is blocked and needs to be cleaned after a period of treatment, the three-way valve 74 controls the inlet pipe 52 to be connected only to the first pipe body 72. Therefore, hot air enters through the first pipe body 72 and the collection cover 62 to backwash and clean the filter screen 61, and the hot air enters the delivery pipe 11 to heat the soil. After cleaning, the three-way valve 74 controls the output pipe 71 to be connected only to the second pipe body 73 to continue to treat the soil.

[0051] The exhaust gas treatment mechanism 8 includes a cyclone dust collector 81 and an adsorption tower 82. The cyclone dust collector 81 is used to communicate with the second pipe body 73, and the flue gas in the second pipe body 73 is dust-removed by the cyclone dust collector 81; the adsorption tower 82 is used to communicate with the cyclone dust collector 81, and the flue gas after dust removal is processed by the adsorption tower 82, thereby realizing the treatment of the flue gas.

[0052] The working principle of the embodiment of the present application is as follows:

[0053] Soil is added into the hopper 2, and the driving part starts to drive the multiple crushing pieces 31 to rotate and crush the soil, and then the soil enters the conveying pipe 11. At the same time, hot air blows obliquely downward to the soil to push the soil into the conveying pipe 11, and the fixed motor 15 starts to drive the spiral conveying piece 12 to rotate and convey the soil. The pollutants in the soil are decomposed to form flue gas, and the flue gas is filtered through the filter screen 61 and enters the collection cover 62. Then the flue gas is processed by the cyclone dust collector 81 and the adsorption tower 82, and the soil is output through the discharge pipe 13, thereby greatly reducing the pressure of impurities on subsequent processing and improving the repair effect and efficiency of the soil.

[0054] When the filter screen 61 is clogged and needs to be cleaned after the soil has been treated for a period of time, the three-way valve 74 controls the inlet pipe 52 to be connected only to the first pipe body 72, so that the hot air backwashes and cleans the filter screen 61, and the hot air enters the delivery pipe 11 to heat the soil. After cleaning, the three-way valve 74 controls the output pipe 71 to be connected only to the second pipe body 73 to continue to treat the soil, further improving the soil repair effect and efficiency.

[0055] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An integrated soil remediation device based on an ex situ chemical heating thermal desorption method, comprising a screw conveyor (1), a heating mechanism (5) and an exhaust gas treatment mechanism (8), characterized in that: It also includes a filter assembly (6) disposed at the connection between the exhaust gas treatment mechanism (8) and the screw conveyor (1), wherein the filter assembly (6) includes: a filter screen (61), the filter screen (61) being arranged on the screw conveyor (1) and being arc-shaped and being in contact with a rotating part of the screw conveyor (1); A collecting hood (62) is arranged on the screw conveyor (1) and covers the filter screen (61) and is connected to the exhaust gas treatment mechanism (8).

2. The integrated soil remediation equipment based on ex situ chemical heating thermal desorption method according to claim 1 is characterized in that: The screw conveyor (1) comprises a conveying pipe (11), a feeding hopper (2), a screw conveying plate (12) and a discharge pipe (13); the feeding hopper (2) is arranged at one end of the conveying pipe (11) and is used to add soil into the conveying pipe (11); the screw conveying plate (12) is rotatably mounted on the conveying pipe (11) and is used to convey the soil to move and to contact the filter screen (61); and the discharge pipe (13) is arranged at one end of the conveying pipe (11) away from the feeding hopper (2) and is used to discharge the soil in the conveying pipe (11).

3. The integrated soil remediation equipment based on ex situ chemical heating thermal desorption method according to claim 2 is characterized in that: The conveying pipe (11) is provided with a mounting hole (14) for the filter screen (61) to engage with, and the mounting hole (14) and the filter screen (61) both extend from the feeding hopper (2) to the discharge pipe (13).

4. The integrated soil remediation equipment based on ex situ chemical heating thermal desorption method according to claim 1 is characterized in that: The collection hood (62) is provided with a recoil assembly (7) for cleaning the filter screen (61), and the recoil assembly (7) comprises: an output pipe (71), wherein the output pipe (71) is arranged on the collection cover (62); A first tube body (72) and a second tube body (73), wherein the first tube body (72) and the second tube body (73) are connected to the delivery pipe (11) via a three-way valve (74) and are respectively in communication with the heating mechanism (5) and the exhaust gas treatment mechanism (8), and the three-way valve (74) controls the output pipe (71) to be in communication with the first tube body (72) or the second tube body (73).

5. The integrated soil remediation equipment based on ex situ chemical heating thermal desorption method according to claim 2 is characterized in that: The heating mechanism (5) comprises: An input pipe (51), wherein the bottom end of the input pipe (51) is arranged on the feeding hopper (2) and the top end is arranged inclined upward; An inlet pipe (52) is arranged at the top end of the input pipe (51) and is used to input hot air.

6. The integrated soil remediation equipment based on ex situ chemical heating thermal desorption method according to claim 2 is characterized in that: The feeding hopper (2) is provided with a crushing mechanism (3), and the crushing mechanism (3) comprises: A plurality of crushing pieces (31), wherein the plurality of crushing pieces (31) are rotatably disposed on the feeding hopper (2) and cooperate to crush the soil; A driving assembly (4) is arranged on the feeding hopper (2) and is used to drive the plurality of shredded pieces (31) to rotate and to make two adjacent shredded pieces (31) rotate in opposite directions.

7. The integrated soil remediation equipment based on the ex situ chemical heating thermal desorption method according to claim 6 is characterized in that: The driving component (4) comprises: a plurality of gears (41), wherein the plurality of gears (41) are respectively arranged on the plurality of crushing pieces (31) and two adjacent gears (41) are meshed with each other; A driving member is arranged on the feeding hopper (2) and is used to drive one of the shredded pieces (31) to rotate.

8. The integrated soil remediation equipment based on ex situ chemical heating thermal desorption method according to claim 1 is characterized in that: The exhaust gas treatment mechanism (8) comprises: a cyclone dust collector (81), the cyclone dust collector (81) being connected to the collection hood (62) and used to remove dust from the flue gas; An adsorption tower (82), the adsorption tower (82) being connected to the cyclone dust collector (81) and used for performing adsorption treatment on the dust-removed flue gas.

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