Hot air and electric heating combined soil purification system

Abstract

The utility model discloses a hot air and electric heating combined soil purification system which comprises a polluted soil receiving bin, an electric isolating valve, a screw feeder, a hot air and electric heating combined soil purification device, a discharging articulated chute, a purified soil receiving bin, a hot air generator, a hot air blower, a tail gas induced draft fan and a tail gas purifier, the hot air and electric heating combined soil purification device comprises a polluted soil purification chamber, a hot air uniformizing chamber, a hot air distribution plate, an electric heating radiator, a purified soil cleaner and a polluted soil stopper. And according to the property of the polluted soil and the content of tail gas pollutants, the working duration of the hot air and the electric heating radiator in the soil purification process is controlled. After the polluted soil is purified, the polluted soil stopper is lifted, and the purified soil cleaner pushes the purified soil to the discharging chute and conveys the purified soil to a subsequent purified soil receiving bin. The system is clear in control system, easy to operate and capable of efficiently supporting the ex-situ remediation work of the contaminated soil.

Description

Technical Field

[0001] The invention relates to the technical field of contaminated soil purification, and in particular to a hot air and electric heat combined soil purification system method. Background Art

[0002] Although traditional soil purification technologies such as physical separation and chemical remediation have certain effects, they are not ideal for treating organically contaminated soil. Hot air heating as a treatment method can volatilize organic matter in the soil, but the treatment efficiency is low; electric heating can increase soil temperature and promote the decomposition of organic matter, but the effect is limited when used alone. Therefore, it is urgent to seek an efficient and environmentally friendly organic contaminated soil purification technology. Summary of the invention

[0003] The present invention provides a hot air and electric heat combined soil purification system and method, aiming to solve the above problems. The device comprises a hot air generator, a hot air and electric heat combined soil purification device, an exhaust gas purifier, a contaminated soil receiving bin, and a purified soil receiving bin.

[0004] The hot air and electric heat combined soil purification system has the following advantages:

[0005] 1. High efficiency: The combined use of hot air and electric heat can heat the soil to the required temperature more quickly, accelerating the decomposition and purification process of organic pollutants. Compared with traditional soil purification methods, this system has higher processing efficiency.

[0006] 2. Wide applicability: The system is suitable for various types of organically contaminated soils, including pesticide pollution, petroleum pollution, hazardous substance pollution, etc. By adjusting the treatment parameters and operating conditions, it can meet the treatment needs of different soil conditions and pollutants.

[0007] 3. Controllability: Through intelligent control, the system can automatically adjust treatment parameters such as temperature, humidity, and the position of electric heating radiators according to soil conditions and pollutant types to ensure the safety and stability of the treatment process.

[0008] 4. Environmental protection: The system uses clean energy and does not produce secondary pollution. The gas generated during the treatment process can be filtered and treated by the tail gas purifier to meet the emission standards and will not cause harm to the environment.

[0009] 5. Scalability: The system can be modularly designed and expanded according to the processing requirements to achieve large-scale soil purification. By increasing the number of equipment and processing units, the processing capacity can be improved to meet the needs of larger-scale soil remediation projects.

[0010] 6. High degree of automation: The system can use artificial intelligence technology to achieve automatic control, which can reduce manual intervention and operational difficulty. At the same time, through the Internet of Things technology and remote communication technology, remote monitoring and control can be achieved, which is convenient for managers to operate and maintain.

[0011] 7. Save resources: The system can reduce energy waste and processing costs through intelligent control and optimization of processing parameters. At the same time, the treated soil can be used for agricultural planting and other purposes to achieve resource recycling.

[0012] In summary, the hot air and electric heat combined soil purification system has the advantages of high efficiency, wide applicability, controllability, environmental protection, scalability, high degree of automation and resource conservation. It can be used as an effective soil remediation and purification technology and is widely used in the fields of environmental protection and ecological restoration.

[0013] To achieve the above object, the technical solution of the present invention is:

[0014] A hot air and electric heat combined soil purification system, comprising a hot air generator, a hot air and electric heat combined soil purification device, and an exhaust gas purifier connected in series, wherein the hot air and electric heat combined soil purification device is also connected to a contaminated soil receiving bin and a purified soil receiving bin;

[0015] The hot air and electric heat combined soil purification device comprises a contaminated soil purification chamber, a hot air uniform air chamber, a hot air distribution plate, an electric heating radiator, a contaminated soil material blocker, and a purified soil material cleaner; the lower part of the contaminated soil purification chamber is connected to the hot air uniform air chamber through the hot air distribution plate, one end of the electric heating radiator is placed inside the contaminated soil purification chamber, the purified soil material cleaner and the contaminated soil material blocker are arranged inside the contaminated soil purification chamber, the purified soil material cleaner is connected to a hydraulic push rod device, and the hydraulic push rod device is connected to a hydraulic station through a hydraulic oil pipe; the contaminated soil material blocker comprises a lifting ring, the lifting ring is fixed to the upper end of the contaminated soil material blocker, and the lifting ring is connected to an electric hoist through a hook and a cable;

[0016] The hot air inlet of the hot air and electric heat combined soil purification device is connected to the hot air outlet of the hot air generator through a hot air duct, and a hot air blower is also connected in series at the end of the hot air duct;

[0017] The tail gas outlet of the hot air and electric heat combined soil purification device is connected to the tail gas inlet of the tail gas purifier through a tail gas duct, and the tail gas induced draft fan is connected in series to the end of the tail gas duct;

[0018] The contaminated soil inlet of the hot air and electric heat combined soil purification device is connected to the contaminated soil discharge outlet of the contaminated soil receiving bin through a contaminated soil conveying pipe, and an electric isolation valve and a screw feeder are installed on the contaminated soil conveying pipe in sequence;

[0019] A plurality of electric heating radiators are arranged on the top of the hot air and electric heating combined soil purification device, and the plurality of electric heating radiators are connected to the reserved openings in the contaminated soil purification chamber, and the reserved openings are provided with sealing covers;

[0020] A material accumulation height sensor is provided on the side of the hot air and electric heat combined soil purification device;

[0021] The hot air and electric heat combined soil purification device has a plurality of hot air outlets on the hot air distribution plate at the bottom, and the outlets are provided with small-aperture isolation nets;

[0022] One side of the hot air and electric heat combined soil purification device is a contaminated soil material blocker, and the contaminated soil material blocker slides up and down;

[0023] The other side of the hot air and electric heat combined soil purification device is a soil purification cleaner, and the soil purification cleaner moves forward and backward.

[0024] Preferably, the contaminated soil receiving bin is located directly above the hot air and electric heat combined soil purification device, the top of the hot air and electric heat combined soil purification device is provided with an opening and closing door, the contaminated soil discharge outlet at the bottom of the contaminated soil receiving bin is connected to the contaminated soil inlet of the hot air and electric heat combined soil purification device through a contaminated soil conveying pipe, and an electric isolation valve and a screw feeder are sequentially provided from top to bottom;

[0025] The screw feeder is equipped with a variable frequency motor.

[0026] Preferably, the hot air inlet of the hot air and electric heat combined soil purification device is connected to the hot air outlet of the hot air generator through an air duct, and the hot air blower is connected in series to the air duct;

[0027] The hot air blower is equipped with a variable frequency motor.

[0028] Preferably, the tail gas outlet of the hot air and electric heat combined soil purification device is connected to the tail gas inlet of the tail gas purifier through a tail gas duct, and the tail gas induced draft fan is connected in series to the tail gas duct;

[0029] The exhaust gas purifier is an exhaust gas purifier that combines physical adsorption with chemical washing, and the exhaust gas induced draft fan is equipped with a variable frequency motor.

[0030] Preferably, the hydraulic station is provided with a frequency converter.

[0031] In summary, the hot air and electric heat combined soil purification system and method disclosed in the present invention have the following beneficial effects:

[0032] (1) The hot air and electric heat radiation in this system can efficiently decompose organic pollutants in the soil, breaking down large molecules into small molecules that are carried away with the exhaust gas;

[0033] (2) The tail gas purifier in the system can directly filter and purify the tail gas containing pollutants generated during the purification process, without the need to set up a separate tail gas treatment device;

[0034] (3) The hot air generator, hot air and electric heat combined soil purification device, tail gas purifier, contaminated soil receiving bin, purified soil receiving bin and other equipment in the system are highly integrated, occupy a small area, and have a high processing capacity per unit area;

[0035] (4) The exhaust fan is used to exhaust air, so that the system operates in a negative pressure state, and pollutant gases are discharged in an organized manner, ensuring a clean environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Schematic diagram of a hot air and electric heat combined soil purification system in an embodiment;

[0037] Figure 2 This is a schematic diagram of the structure of the polluted soil material blocker and the purified soil material cleaner in this embodiment;

[0038] Figure 3 This is a diagram showing the arrangement of the air outlets of the bottom air distribution plate in the embodiment;

[0039] Figure 4 This is a layout diagram of the top electric heating radiator and contaminated soil inlet in the embodiment.

[0040] The attached drawings are marked as follows: 100. Contaminated soil receiving bin; 110. Contaminated soil conveying pipe; 111. Electric isolation valve; 112. Screw feeder; 120. Discharge chute; 200. Hot air and electric heat combined soil purification device; 210. Contaminated soil purification chamber; 211. Hot air blower; 212. Hot air equalizing chamber; 213. Hot air distribution plate; 214. Exhaust exhaust fan; 221. Electric heating radiator; 231. Contaminated soil blocker; 232. Lifting ring; 241. Purified soil cleaner; 242. Hydraulic push rod device; 243. Hydraulic oil pipe; 244. Hydraulic station; 300. Hot air generator; 310. Hot air duct; 400. Exhaust purifier; 410. Exhaust duct; 500. Purified soil receiving bin. DETAILED DESCRIPTION

[0041] In order to better understand the technical content of the present invention, specific embodiments are given and described as follows in conjunction with the accompanying drawings.

[0042] like Figure 1 , 2The hot air and electric heat combined soil purification system shown includes: a hot air generator 300, a hot air and electric heat combined soil purification device 200, and an exhaust gas purifier 400. The hot air and electric heat combined soil purification device 200 is also connected to a contaminated soil receiving bin 100, a purified soil receiving bin 500, etc.

[0043] The hot air and electric heat combined soil purification device 200 includes a hot air equalizing chamber 212 , a hot air distribution plate 213 , a contaminated soil purification chamber 210 , an electric heating radiator 221 , a purified soil cleaner 241 , and a contaminated soil blocker 231 .

[0044] The soil cleaning device 241 includes a hydraulic push rod device 242 and is connected to a hydraulic station 244 via a hydraulic oil pipe 243 .

[0045] The contaminated soil material blocker 231 includes a lifting ring 232 fixed to the upper end of the contaminated soil material blocker 231 .

[0046] The hot air inlet of the hot air and electric heat combined soil purification device 200 is connected to the hot air outlet of the hot air generator 300 through an air duct 310, and the hot air blower 211 is connected to the air duct;

[0047] The tail gas outlet of the hot air and electric heat combined soil purification device 200 is connected to the tail gas inlet of the tail gas purifier 400 through the air duct 410, and the tail gas induced draft fan 214 is connected to the air duct;

[0048] The contaminated soil inlet of the hot air and electric heat combined soil purification device 200 is connected to the contaminated soil discharge outlet of the contaminated soil receiving bin 100 through a contaminated soil conveying pipe 110, and an electric isolation valve 111 and a screw feeder 112 are sequentially installed on the contaminated soil conveying pipe 110;

[0049] The top of the hot air and electric heat combined soil purification device 200 has a plurality of electric heat radiators 221 inserted into the reserved openings in the contaminated soil purification chamber 210 and is provided with a sealing cover;

[0050] A material accumulation height sensor is provided on the side of the hot air and electric heat combined soil purification device 200, which can monitor the accumulation height of the contaminated soil in the contaminated soil purification chamber 210;

[0051] There are several hot air outlets on the hot air distribution plate 213 at the bottom of the hot air and electric heat combined soil purification device 200, and the outlets are provided with small aperture isolation nets to separate the hot air equalization chamber 212 and the contaminated soil purification chamber 210;

[0052] One side of the hot air and electric heat combined soil purification device 200 is a contaminated soil blocker 231, which can slide up and down;

[0053] The other side of the hot air and electric heat combined soil purification device 200 is a soil purification cleaner 241, which can be pushed forward and backward;

[0054] Insulation measures should be taken outside the gas pipeline to reduce heat loss, improve heat utilization, and ensure that the temperature of the hot air entering the equipment is within the temperature range for the decomposition of organic pollutants.

[0055] The screw feeder 112 uses a variable frequency motor, and the feeding rate is controlled by changing the motor speed.

[0056] The hot air blower 211 and the exhaust draft fan 214 both use variable frequency fans, which change the air volume by changing the fan speed to match the system requirements, thereby achieving the lowest energy consumption and the highest comprehensive benefit.

[0057] The hot air inlet of the hot air and electric heat combined soil purification device 200 is connected to the hot air outlet of the hot air generator 300 through a hot air duct 310, and the hot air blower 211 is connected to the duct to send the hot air into the hot air and electric heat combined soil purification device 200, and reaches the contaminated soil purification chamber 210 through the hot air equalizing chamber 212 and the hot air distribution plate 213 to decompose the organic pollutants in the contaminated soil.

[0058] The hot air generator 300 can generate hot air at 150-650° C. according to demand, and can generate hot air of different temperatures according to the properties of the contaminated soil.

[0059] The exhaust gas outlet of the hot air and electric heat combined soil purification device 200 is connected to the exhaust gas inlet of the exhaust gas purifier 400 through the exhaust gas duct 410, and the exhaust gas induced draft fan 214 is connected to the duct to draw the exhaust gas containing organic pollutants into the exhaust gas purifier 400, and maintain a slight negative pressure in the system to avoid leakage of pollutants.

[0060] The electric thermal radiator 221 is inserted into the contaminated soil purification chamber 210 from the top reserved opening of the hot air and electric heat combined soil purification device 200, and is well sealed with the reserved opening. Through electric heat conversion, heat is radiated to the contaminated soil to decompose organic pollutants in the contaminated soil. After the soil purification is completed, the electric heat conversion is disconnected, and the electric thermal radiator 221 is withdrawn from the hot air and electric heat combined soil purification device 200 and covered with a sealing cover.

[0061] The hot air distribution chamber 212 evenly guides the hot air from the blower to the hot air distribution plate 213, reducing the instability of the hot air flow at the outlet of the hot air distribution plate 213; the hot air distribution plate 213 evenly guides the hot air into the contaminated soil purification chamber 210, evenly heats the internal contaminated soil, and decomposes the organic pollutants therein.

[0062] The contaminated soil material blocker 231 falls before the contaminated soil is fed and rises after the contaminated soil is purified. The purified soil is pushed into the discharge chute 120 by the purified soil cleaning device 241 and finally enters the purified soil receiving bin 500. The contaminated soil material blocker 231 is embedded in the hot air and electric heat combined soil purification device 200.

[0063] The purified soil cleaner 241 moves back before and after the contaminated soil is fed, and moves forward after the contaminated soil is purified. The purified soil is pushed into the discharge chute 120 by the purified soil cleaner 241 and finally enters the purified soil receiving bin 500. The driving source of the purified soil cleaner 241 is a hydraulic station 244, which is connected by a hydraulic push rod device 242 and a hydraulic oil pipe 243. The hydraulic station 244 is equipped with a frequency converter and can be controlled according to demand.

[0064] The system works as follows:

[0065] Open the sealing cover of the reserved opening of the electric heating radiator 221 above the hot air and electric heating combined soil purification device 200, and insert the electric heating radiator 221;

[0066] The contaminated soil passes through the electric isolation valve 111 and the screw feeder 112 from the contaminated soil outlet at the bottom of the contaminated soil receiving bin 100, and enters the contaminated soil purification chamber 210 through the contaminated soil inlet at the top of the hot air and electric heat combined soil purification device 200, and the exhaust induced draft fan 214, the hot air blower 211 and the hot air generator 300 are started synchronously to maintain a slight negative pressure in the system;

[0067] According to the feedback signal of the material accumulation height sensor, the contaminated soil is accumulated to the height of the hot air and electric heat combined soil purification device 2002 / 3, and the feeding is stopped, the screw feeder 112 is turned off, and the electric isolation valve 111 is closed;

[0068] The exhaust induced draft fan 214 is started first, and then the hot air blower 211 and the hot air generator 300 are started. The hot air generated by the hot air generator 300 passes through the hot air blower 211, the hot air equalizing chamber 212, and the hot air distribution plate 213 in sequence and enters the contaminated soil purification chamber 210;

[0069] The electric heat radiator 221 is started, and the hot air generated by the hot air generator 300 is used to heat the contaminated soil, thereby decomposing the organic pollutants in the contaminated soil; the exhaust gas generated during the purification process is sequentially purified by the exhaust induced draft fan 214 and the exhaust purifier 400 and then discharged after being purified to meet the standards;

[0070] The degree of purification of the contaminated soil is judged according to the concentration of pollutants at the inlet of the tail gas purifier 400. When the concentration indicators of various pollutants are stable and meet the purification requirements, the electric heat radiator 221 is firstly withdrawn from the contaminated soil purification chamber 210 and covered with a sealing cover. During this process, attention should be paid to the negative pressure condition in the system; then the hot air generator 300, the hot air blower 211, and the tail gas exhaust fan 214 are sequentially closed;

[0071] The contaminated soil material blocker 231 is lifted and fixed through the lifting ring 232; the hydraulic station 244 delivers the hydraulic oil to the hydraulic push rod device 242 through the hydraulic oil pipe 243, driving the purified soil material cleaner 241 to push the purified soil forward to the discharge chute 120, and finally enter the purified soil receiving bin 500;

[0072] After completing the above steps, the hydraulic station 244 releases pressure, the hydraulic oil refluxes, and the soil purification cleaner 241 also returns to the initial position synchronously; the fixation at the lifting ring 232 is released, and the contaminated soil blocker 231 falls back to the initial position; after checking that there are no problems, the above steps can be repeated to carry out the next round of contaminated soil purification work.

[0073] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.

Claims

1. A hot air and electric heat combined soil purification system, characterized in that: It comprises a hot air generator (300), a hot air and electric heat combined soil purification device (200), and an exhaust gas purifier (400) which are connected in series in sequence, wherein the hot air and electric heat combined soil purification device (200) is also connected to a contaminated soil receiving bin (100) and a purified soil receiving bin (500); The hot air and electric heat combined soil purification device (200) comprises a contaminated soil purification chamber (210), a hot air uniform air chamber (212), a hot air distribution plate (213), an electric heat radiator (221), a contaminated soil material blocker (231), and a purified soil material cleaner (241); the lower part of the contaminated soil purification chamber (210) is connected to the hot air uniform air chamber (212) via the hot air distribution plate (213), one end of the electric heat radiator (221) is placed inside the contaminated soil purification chamber (210), and the purified soil material cleaner (241) is placed inside the contaminated soil purification chamber (210). The material container (241) and the contaminated soil material blocker (231) are arranged inside the contaminated soil purification chamber (210); the soil purification material blocker (241) is connected to a hydraulic push rod device (242); the hydraulic push rod device (242) is connected to a hydraulic station (244) via a hydraulic oil pipe (243); the contaminated soil material blocker (231) comprises a lifting ring (232); the lifting ring (232) is fixed to the upper end of the contaminated soil material blocker (231); the lifting ring (232) is connected to an electric hoist via a hook and a cable; The hot air inlet of the hot air and electric heat combined soil purification device (200) is connected to the hot air outlet of the hot air generator (300) via a hot air duct (310), and a hot air blower (211) is also connected in series to the end of the hot air duct (310); The tail gas outlet of the hot air and electric heat combined soil purification device (200) is connected to the tail gas inlet of the tail gas purifier (400) via a tail gas duct (410), and the tail gas induced draft fan (214) is connected in series to the end of the tail gas duct (410); The contaminated soil inlet of the hot air and electric heat combined soil purification device (200) is connected to the contaminated soil discharge outlet of the contaminated soil receiving bin (100) via a contaminated soil conveying pipe (110), and an electric isolation valve (111) and a screw feeder (112) are sequentially installed on the contaminated soil conveying pipe (110); A plurality of electric heat radiators (221) are provided on the top of the hot air and electric heat combined soil purification device (200), the plurality of electric heat radiators (221) are connected to a reserved opening in the contaminated soil purification chamber (210), and the reserved opening is provided with a sealing cover; A material accumulation height sensor is provided on the side of the hot air and electric heat combined soil purification device (200); The hot air and electric heat combined soil purification device (200) has a plurality of hot air outlets on the hot air distribution plate (213) at the bottom, and the outlets are provided with small-aperture isolation nets; One side of the hot air and electric heat combined soil purification device (200) is a contaminated soil blocker (231), and the contaminated soil blocker (231) slides up and down; The other side of the hot air and electric heat combined soil purification device (200) is a soil purification cleaner (241), and the soil purification cleaner (241) moves forward and backward.

2. A hot air and electric heat combined soil purification system as claimed in claim 1, characterized in that: The contaminated soil receiving bin (100) is located directly above the hot air and electric heat combined soil purification device (200); the top of the hot air and electric heat combined soil purification device (200) is provided with an opening and closing door; the contaminated soil discharge outlet at the bottom of the contaminated soil receiving bin (100) is connected to the contaminated soil inlet of the hot air and electric heat combined soil purification device (200) via a contaminated soil conveying pipe (110); and an electric isolation valve (111) and a screw feeder (112) are provided in sequence from top to bottom; The screw feeder (112) is equipped with a variable frequency motor.

3. A hot air and electric heat combined soil purification system as claimed in claim 1, characterized in that: The hot air inlet of the hot air and electric heat combined soil purification device (200) is connected to the hot air outlet of the hot air generator (300) via an air duct (310), and the hot air blower (211) is connected in series to the air duct (310); The hot air blower (211) is equipped with a variable frequency motor.

4. A hot air and electric heat combined soil purification system as claimed in claim 1, characterized in that: The exhaust gas outlet of the hot air and electric heat combined soil purification device (200) is connected to the exhaust gas inlet of the exhaust gas purifier (400) via an exhaust gas duct (410), and the exhaust gas induced draft fan (214) is connected in series to the exhaust gas duct (410); The exhaust gas induced draft fan (214) is equipped with a variable frequency motor.

5. A hot air and electric heat combined soil purification system as claimed in claim 1, characterized in that: The hydraulic station (244) is provided with a frequency converter.

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