CN214321285U

CN214321285U - High-efficient environmental protection's thermal desorption equipment of decomposition organic pollutant

Info

Publication number: CN214321285U
Application number: CN202120012525.2U
Authority: CN
Inventors: 许保江; 赖安; 黄伟棋
Original assignee: Guangzhou Sui Tu Environmental Protection Engineering Co ltd
Current assignee: Guangzhou Sui Tu Environmental Protection Engineering Co ltd
Priority date: 2021-01-05
Filing date: 2021-01-05
Publication date: 2021-10-01
Anticipated expiration: 2031-01-05

Abstract

The utility model relates to the technical field of soil pollution remediation, in particular to a high-efficiency environment-friendly thermal desorption device for decomposing organic pollutants, which comprises a pretreatment feeding system, a thermal desorption discharging system, a tail gas treatment system and a PLC automatic control system, after gas is introduced into an outer cylinder of a shaftless screw conveyor, the soil can be preheated and heated, and the energy utilization rate is high; the high-temperature gas recovery system can reduce the water content of the soil, primarily remove soil pollutants, improve the soil treatment time under the same condition without generating additional energy consumption, and has high treatment efficiency; the PLC automatic control system is adopted to automatically control a temperature rise program, the temperature is monitored in real time, the waste of energy is avoided, the resource utilization rate is improved, the denaturation of organic matters caused by excessive temperature and secondary pollution are prevented, the high-temperature tail gas is utilized, the pressure of waste gas treatment is reduced, and the economic benefit is high; the complete tail gas treatment system is arranged, the tail gas is purified in a targeted and multi-level mode, and the environmental benefit is better.

Description

High-efficient environmental protection's thermal desorption equipment of decomposition organic pollutant

Technical Field

The utility model relates to a soil pollution repair technology field especially relates to a thermal desorption equipment of decomposition organic pollutant of high-efficient environmental protection.

Background

In the development process of chemical industry in China, because of low environmental protection consciousness, a large amount of toxic and harmful substances, particularly organic substances enter soil, the soil pollution situation in China is serious day by day, a large number of lands are seriously polluted because of inadequate environmental protection measures, and according to the needs of industrial adjustment and urbanization in China, a large number of industrial enterprises and chemical enterprises migrate out of cities in succession, a large number of polluted sites are left, surrounding residents and ecological environments are seriously threatened, these contaminated sites need further to be administered and restoreed, because contaminated site will be used as living land or other construction land in short period and utilized once more, so need the soil remediation technology that the remediation efficiency is high, the cycle is short, the pyrolysis desorption is as a soil dystopy processing mode, has that the treatment effect is good, the advantage that the repair cycle is short, can use thermal desorption equipment to decompose organic pollutant.

When the existing thermal desorption equipment for decomposing organic pollutants is used, because the soil environment is complex, the water content of soil in different plots, the soil texture, impurity garbage in the soil and the like are different, the water content of partial soil is higher, and a necessary feeder is not arranged in a feeding bin, so that the soil at a discharging port is accumulated into blocks, and the problem of difficult natural discharging and even blockage is caused; after the high-moisture-content soil is subjected to high temperature in the rotary kiln, the high-moisture-content soil is easy to sinter into blocks, so that the repairing effect is reduced, a discharge hole is blocked or left in the kiln body during discharging, and the load of the kiln body is increased; in addition, metal impurities such as steel bar heads and the like in the soil are easy to melt and adhere to the inner wall of the main body in the high-temperature main body, so that the thermal desorption efficiency is reduced, and the energy consumption is increased; during tail gas treatment, high-temperature flue gas cannot be fully utilized, redundant heat is lost, and the tail gas treatment pressure is increased.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the shortcoming that exists among the prior art, and the thermal desorption equipment of decomposition organic pollutant of a high-efficient environmental protection that proposes makes its degree of automation and treatment effeciency control accuracy high, and energy utilization is rateed highly, and the treatment effeciency is high, and economic benefits is high, and environmental benefit is better.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

designing high-efficiency and environment-friendly thermal desorption equipment for decomposing organic pollutants, which comprises a pretreatment feeding system, a thermal desorption discharging system, a tail gas treatment system and a PLC automatic control system, wherein the pretreatment feeding system and the tail gas treatment system are connected with the thermal desorption discharging system, the PLC automatic control system is electrically connected with the pretreatment feeding system, the thermal desorption discharging system and the tail gas treatment system through leads, the pretreatment feeding system comprises a storage bin, the device comprises a feed hopper, a belt scale, a conveying belt, a magnetic separator and a shaftless spiral conveyor, wherein the feed hopper is arranged at the bottom of a storage bin, the belt scale is arranged below the feed hopper and is arranged on the conveying belt, an outlet of the conveying belt is positioned right above a feed inlet of the magnetic separator, a discharge outlet of the magnetic separator is connected with the feed inlet of the shaftless spiral conveyor, and a discharge outlet of the shaftless spiral conveyor is connected with a thermal desorption discharge system;

the thermal desorption discharging system comprises a rotary kiln, a gas supply station, a burner, a combustion-supporting fan and a spiral discharging machine, wherein a feed inlet of the rotary kiln is connected with a discharge outlet of a shaftless spiral conveyor, the burner and the combustion-supporting fan are arranged in the rotary kiln, the burner is connected with a gas outlet of the gas supply station through a pipeline, the spiral discharging machine is arranged at the discharge outlet of the rotary kiln, and the gas outlet of the rotary kiln is connected with a tail gas treatment system through a pipeline;

the tail gas treatment system comprises a cyclone dust collector, a quench tower, a buffer tank, a bag-type dust collector and a scrubber tower, the defroster, the heat exchanger, UV photodissociation clearing machine, active carbon tower and draught fan, cyclone's air inlet is linked together through the gas outlet of pipeline with the rotary kiln, cyclone's gas outlet is linked together with the air inlet of quench tower, the gas outlet of quench tower is linked together with the air inlet of surge tank, the gas outlet of surge tank is linked together with the air inlet of sack cleaner, the gas outlet of sack cleaner is linked together with the air inlet of scrubbing tower, the gas outlet of scrubbing tower is linked together with the air inlet of defroster, the gas outlet of defroster is linked together with the air inlet of heat exchanger, the gas outlet of heat exchanger is linked together with the air inlet of UV photodissociation clearing machine, the gas outlet of UV photodissociation clearing machine is linked together with the air inlet of active carbon tower, the gas outlet of active carbon tower is linked together with the air inlet of draught fan.

Preferably, the belt speed of the conveying belt is 6-12 m/s.

Preferably, the relative humidity of the gas discharged through the quenching tower is 10% to 20%.

Preferably, an air outlet of the induced draft fan is communicated with a chimney, and waste gas discharged by the induced draft fan is discharged from high altitude through the chimney.

Preferably, the spiral discharging machine adopts a water-cooled spiral discharging structure.

The utility model provides a pair of high-efficient environmental protection's thermal desorption equipment of decomposition organic pollutant, beneficial effect lies in:

1. this high-efficient environmental protection's thermal desorption equipment of decomposition organic pollutant adopts PLC automatic control system, sets up main parameter on-line monitoring system, does benefit to soil restoration process control, and degree of automation and treatment effeciency control accuracy are high.

2. This high-efficient environmental protection's thermal desorption equipment of decomposition organic pollutant sets up high-temperature gas recovery system, and gaseous after introducing the feed screw urceolus, preheats the intensification to soil, and energy utilization is high.

3. This high-efficient environmental protection's thermal desorption equipment of decomposition organic pollutant, high-temperature gas recovery system can reduce soil moisture content, tentatively gets rid of soil pollutant, has promoted soil treatment time and does not produce extra energy resource consumption under with the condition, and the treatment effeciency is high.

4. This high-efficient environmental protection's thermal desorption equipment of decomposition organic pollutant, intensification procedure automatic control, real-time supervision temperature avoids the waste of the energy, improves resource utilization, prevents that excessive temperature from causing the degeneration of organic matter, causes secondary pollution, and high temperature tail gas utilizes, has also reduced exhaust-gas treatment's pressure, and economic benefits is high.

5. This high-efficient environmental protection's thermal desorption equipment of decomposition organic pollutant sets up complete tail gas processing system, and pertinence, multi-level carry out purification treatment to tail gas, set up the on-line measuring system before discharging, and real-time supervision record discharges data, and environmental benefit is better.

Drawings

Fig. 1 is a schematic view of a thermal desorption process of a high-efficiency and environment-friendly thermal desorption device for decomposing organic pollutants according to the present invention;

fig. 2 is the utility model provides a high-efficient environmental protection's thermal desorption equipment's of decomposition organic pollutant equipment connection schematic diagram.

In the figure: 1. a pretreatment feed system; 11. a storage bin; 12. a feed hopper; 13. a belt scale; 14. a conveyor belt; 15. a magnetic separator; 16. a shaftless screw conveyor; 2. a thermal desorption discharge system; 21. a rotary kiln; 22. a gas supply station; 23. a burner; 24. a combustion fan; 25. a spiral discharging machine; 3. a tail gas treatment system; 31. a cyclone dust collector; 32. a quench tower; 33. a buffer tank; 34. a bag-type dust collector; 35. a scrubber tower; 36. a demister; 37. a heat exchanger; 38. a UV photolysis purifier; 39. an activated carbon tower; 310. an induced draft fan; 4. PLC automatic control system.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Referring to fig. 1, a high-efficiency environment-friendly thermal desorption device for decomposing organic pollutants comprises a pretreatment feeding system 1, a thermal desorption discharging system 2, a tail gas treatment system 3 and a PLC automatic control system 4, wherein the pretreatment feeding system 1 and the tail gas treatment system 3 are both connected with the thermal desorption discharging system 2, the PLC automatic control system 4 is electrically connected with the pretreatment feeding system 1, the thermal desorption discharging system 2 and the tail gas treatment system 3 through wires, the pretreatment feeding system 1 comprises a storage hopper 11, a feeding hopper 12, a belt scale 13, a conveying belt 14, a magnetic separator 15 and a shaftless screw conveyor 16, the bottom of the storage hopper 11 is provided with the feeding hopper 12, the belt scale 13 is arranged below the feeding hopper 12, the belt scale 13 is arranged on the conveying belt 14, an outlet of the conveying belt 14 is positioned right above a feeding port of the magnetic separator 15, a discharging port of the magnetic separator 15 is connected with a feeding port of the shaftless screw conveyor 16, the discharge port of the shaftless screw conveyor 16 is connected with the thermal desorption discharge system 2, the polluted soil is put into the bin 11 by the engineering machinery and falls onto the belt scale 13 through the arch breaking device, the belt scale 13 calculates the conveying capacity according to the belt speed and the integral of the material layer thickness, the belt conveyor control precision (plus or minus 3 percent) is realized, and the belt speed of the conveying belt 14 is 10 m/s. The contaminated soil is subjected to magnetic separator 15 to remove metal impurities in the soil, and is sent to rotary kiln 21 through shaftless screw conveyor 16 for thermal desorption.

The thermal desorption discharging system 2 comprises a rotary kiln 21, a gas supply station 22, a burner 23, a combustion-supporting fan 24 and a spiral discharging machine 25, wherein a feeding hole of the rotary kiln 21 is connected with a discharging hole of a shaftless screw conveyor 16, the burner 23 and the combustion-supporting fan 24 are installed inside the rotary kiln 21, the burner 23 is connected with a gas outlet of the gas supply station 22 through a pipeline, the spiral discharging machine 25 is arranged at the discharging hole of the rotary kiln 21, the spiral discharging machine 25 adopts a water-cooled spiral discharging structure, the gas outlet of the rotary kiln 21 is connected with a tail gas treatment system 3 through a pipeline, the feeding hole of the rotary kiln 21 is spirally arranged at the kiln tail of the rotary kiln 21, combustible gas is ignited by the burner 23 and sprayed into the rotary kiln 21 for combustion, flame is generated in 6 meters of the rotary kiln to form a high-temperature area, the combustion-supporting fan 24 plays a combustion-supporting effect and carries out final high-temperature calcination on solid-phase materials, the calcined solid-phase material is cooled and sent out by a spiral discharging machine 25, and harmful gas reversely flows to a feed inlet of the rotary kiln 21 to overflow and enters the tail gas treatment system 3 through a shaftless spiral conveyor 16.

The tail gas treatment system 3 comprises a cyclone dust collector 31, a quench tower 32, a buffer tank 33, a bag-type dust collector 34, a scrubbing tower 35, a demister 36, a heat exchanger 37, a UV photolysis purifier 38, an activated carbon tower 39 and an induced draft fan 310, wherein the gas inlet of the cyclone dust collector 31 is communicated with the gas outlet of the rotary kiln 21 through a pipeline, the gas outlet of the cyclone dust collector 31 is communicated with the gas inlet of the quench tower 32, the gas outlet of the quench tower 32 is communicated with the gas inlet of the buffer tank 33, the gas outlet of the buffer tank 33 is communicated with the gas inlet of the bag-type dust collector 34, the gas outlet of the bag-type dust collector 34 is communicated with the gas inlet of the scrubbing tower 35, the gas outlet of the scrubbing tower 35 is communicated with the gas inlet of the demister 36, the gas outlet of the demister 36 is communicated with the gas inlet of the heat exchanger 37, the gas outlet of the heat exchanger 37 is communicated with the gas inlet of the UV photolysis purifier 38, and the gas outlet of the UV photolysis purifier 38 is communicated with the gas inlet of the activated carbon tower 39, the air outlet of the active carbon tower 39 is communicated with the air inlet of the induced draft fan 310, the air outlet of the induced draft fan 310 is communicated with the chimney, the waste gas discharged from the induced draft fan 310 is discharged from high altitude through the chimney, the tail gas discharged from the rotary kiln 21 is firstly introduced into the outer cylinder of the shaftless screw conveyor 16 to preheat soil, then discharged from the front end outlet of the shaftless screw conveyor 16, enters the cyclone dust collector 31 through the tangent inlet, the air flow rotates in the cyclone dust collector 31, the dust particles in the air flow move to the outer wall under the action of centrifugal force and reach the wall surface, and fall into the ash hopper along the wall under the action of air flow and gravity to achieve the purpose of separation, most part of the rotating air flow forms ascending internal rotation air flow from a cylinder along the wall, is discharged from the exhaust pipe of the dust collector, enters the quench tower 32, and the temperature of the outlet of the flue gas is controlled at the required temperature after the gas passes through the quench tower 32, the atomized water drop particles can be completely vaporized in a short time and are reheated by the flue gas to form unsaturated gas, the relative humidity is about 15 percent generally, thereby being convenient for subsequent dust removal equipment and the like, effectively avoiding the generation of dioxin, the tail gas from the quenching tower 32 is buffered by the buffer tank 33 and then enters the bag-type dust remover 34 to further remove tail gas dust, the dedusting tail gas enters the scrubber 35 to process the organic part of the tail gas, organic pollutants such as chlorine and the like are removed by a wet scrubbing mode, the tail gas enters a demister 36 for gas-liquid separation, the gas temperature is further reduced by a heat exchanger 37, and the cooled tail gas passes through the UV photolysis purifier 38 and the active carbon tower 39, organic pollutants in the tail gas are further removed, and then the tail gas is introduced into a high-altitude chimney by the induced draft fan 310 to be discharged.

The working principle is as follows: the polluted soil is put into a storage bin 11 by engineering machinery and falls onto a belt scale 13 through an arch breaking device, the belt scale 13 calculates the conveying amount according to the integral of the belt speed and the material layer thickness, the control precision of the belt conveyor (plus or minus 3 percent) is realized, and the belt speed of a conveying belt 14 is 10 m/s. Removing metal impurities in the polluted soil by a magnetic separator 15, feeding the polluted soil into a rotary kiln 21 for thermal desorption by a shaftless screw conveyor 16, spirally arranging a feed inlet of the rotary kiln 21 at the kiln tail of the rotary kiln 21, igniting combustible gas by a burner 23, spraying the combustible gas into the rotary kiln 21 for combustion, generating flame in 6 m of the rotary kiln to form a high-temperature region, enabling a combustion-supporting fan 24 to play a combustion-supporting effect, carrying out final high-temperature calcination on solid-phase materials, cooling and sending out the calcined solid-phase materials by a screw discharging machine 25, reversely surging harmful gas to the feed inlet of the rotary kiln 21 to overflow, feeding the harmful gas into a tail gas treatment system 3 by the shaftless screw conveyor 16, firstly introducing tail gas from the rotary kiln 21 into an outer barrel of the shaftless screw conveyor 16, preheating the soil, then discharging from an outlet at the front end of the shaftless screw conveyor 16, feeding the harmful gas into a cyclone dust collector 31 by a tangential inlet, and then enabling the airflow to rotate in the cyclone dust collector 31, the dust particles in the air flow move to the outer wall under the action of centrifugal force, reach the wall surface, and fall into an ash bucket along the wall under the action of air flow and gravity to achieve the purpose of separation, most of the rotating air flow forms ascending internal rotating air flow from a cylinder body along the wall surface, and is discharged from an exhaust pipe of a dust remover and enters a quenching tower 32, the gas passes through the quenching tower 32, so that the outlet temperature of the flue gas is controlled at the required temperature, the atomized water droplet particles are required to be completely vaporized within a short time and are reheated by the flue gas to form unsaturated gas, the relative humidity of the unsaturated gas is about 15 percent generally, the subsequent dust removal equipment is convenient, the generation of dioxin is effectively avoided, the important significance for environmental protection is achieved, the tail gas from the quenching tower 32 is buffered by a buffer tank 33 and then enters a bag dust remover 34 to further remove tail gas dust, the dust removal tail gas enters a gas washing tower 35 to perform the treatment of organic part of the tail gas, organic pollutants such as chlorine and the like are removed through wet scrubbing, the tail gas enters a demister 36 for gas-liquid separation, the temperature of the gas is further reduced through a heat exchanger 37, the next step of treatment is facilitated, and the cooled tail gas passes through a UV photolysis purifier 38 and an active carbon tower 39, is further subjected to removal of the organic pollutants in the tail gas and then is introduced into a high-altitude chimney by an induced draft fan 310 for emission.

In summary, the following steps: according to the efficient and environment-friendly thermal desorption equipment for decomposing the organic pollutants, the high-temperature gas recovery system is arranged, and after gas is introduced into the outer barrel of the shaftless screw conveyor 16, the soil can be preheated and heated, so that the energy utilization rate is high; the high-temperature gas recovery system can reduce the water content of the soil, primarily remove soil pollutants, improve the soil treatment time under the same condition without generating additional energy consumption, and has high treatment efficiency; the PLC automatic control system is adopted to automatically control a temperature rise program, the temperature is monitored in real time, the waste of energy is avoided, the resource utilization rate is improved, the denaturation of organic matters caused by excessive temperature and secondary pollution are prevented, the pressure of waste gas treatment is reduced due to the utilization of high-temperature tail gas, and the economic benefit is high; set up complete tail gas processing system, pertinence, multi-level carry out purification treatment to tail gas, set up on-line measuring system before the emission, real-time supervision record discharges data, and environmental benefit is better.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. The high-efficiency environment-friendly thermal desorption equipment for decomposing organic pollutants comprises a pretreatment feeding system (1), a thermal desorption discharging system (2), a tail gas treatment system (3) and a PLC automatic control system (4), wherein the pretreatment feeding system (1) and the tail gas treatment system (3) are both connected with the thermal desorption discharging system (2), the PLC automatic control system (4) is electrically connected with the pretreatment feeding system (1), the thermal desorption discharging system (2) and the tail gas treatment system (3) through leads, the high-efficiency environment-friendly thermal desorption equipment is characterized in that the pretreatment feeding system (1) comprises a bin (11), a feeding hopper (12), a belt scale (13), a conveying belt (14), a magnetic separator (15) and a shaftless screw conveyor (16), the feeding hopper (12) is arranged at the bottom of the bin (11), the belt scale (13) is arranged below the feeding hopper (12), the belt weigher (13) is arranged on the conveyer belt (14), the outlet of the conveyer belt (14) is positioned right above the feed inlet of the magnetic separator (15), the discharge outlet of the magnetic separator (15) is connected with the feed inlet of the shaftless screw conveyor (16), and the discharge outlet of the shaftless screw conveyor (16) is connected with the thermal desorption discharge system (2);

the thermal desorption discharging system (2) comprises a rotary kiln (21), a fuel gas supply station (22), a burner (23), a combustion fan (24) and a spiral discharging machine (25), wherein a feed inlet of the rotary kiln (21) is connected with a discharge outlet of a shaftless screw conveyor (16), the burner (23) and the combustion fan (24) are installed inside the rotary kiln (21), the burner (23) is connected with a gas outlet of the fuel gas supply station (22) through a pipeline, the spiral discharging machine (25) is arranged at a discharge outlet of the rotary kiln (21), and the gas outlet of the rotary kiln (21) is connected with a tail gas treatment system (3) through a pipeline;

the tail gas treatment system (3) comprises a cyclone dust collector (31), a quench tower (32), a buffer tank (33), a bag-type dust collector (34), a scrubbing tower (35), a demister (36), a heat exchanger (37), a UV photolysis purifier (38), an activated carbon tower (39) and a draught fan (310), wherein the gas inlet of the cyclone dust collector (31) is communicated with the gas outlet of the rotary kiln (21) through a pipeline, the gas outlet of the cyclone dust collector (31) is communicated with the gas inlet of the quench tower (32), the gas outlet of the quench tower (32) is communicated with the gas inlet of the buffer tank (33), the gas outlet of the buffer tank (33) is communicated with the gas inlet of the bag-type dust collector (34), the gas outlet of the bag-type dust collector (34) is communicated with the gas inlet of the scrubbing tower (35), the gas outlet of the scrubbing tower (35) is communicated with the gas inlet of the demister (36), the gas outlet of the demister (36) is communicated with the gas inlet of the heat exchanger (37), the gas outlet of the heat exchanger (37) is communicated with the gas inlet of the UV photolysis purifier (38), the gas outlet of the UV photolysis purifier (38) is communicated with the gas inlet of the activated carbon tower (39), and the gas outlet of the activated carbon tower (39) is communicated with the gas inlet of the induced draft fan (310).

2. A high efficiency and environmental protection type thermal desorption apparatus for decomposing organic pollutants according to claim 1, wherein the belt speed of the conveyor belt (14) is 6-12 m/s.

3. A high efficiency and environmental protection type thermal desorption apparatus for decomposing organic pollutants according to claim 1, wherein the relative humidity of the gas discharged from the quenching tower (32) is 10-20%.

4. The high-efficiency environment-friendly thermal desorption equipment for decomposing organic pollutants according to claim 1, wherein an air outlet of the induced draft fan (310) is communicated with a chimney, and waste gas discharged by the induced draft fan (310) is discharged aloft through the chimney.

5. The high-efficiency environment-friendly thermal desorption equipment for decomposing organic pollutants according to claim 1, wherein the spiral discharging machine (25) adopts a water-cooled spiral discharging structure.