CN112958611A - Fuel oil combustion treatment method for thermal desorption remediation of contaminated soil - Google Patents
Fuel oil combustion treatment method for thermal desorption remediation of contaminated soil Download PDFInfo
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- CN112958611A CN112958611A CN202110196971.8A CN202110196971A CN112958611A CN 112958611 A CN112958611 A CN 112958611A CN 202110196971 A CN202110196971 A CN 202110196971A CN 112958611 A CN112958611 A CN 112958611A
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- fuel
- combustion
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- fuel oil
- thermal desorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/06—Reclamation of contaminated soil thermally
- B09C1/065—Reclamation of contaminated soil thermally by pyrolysis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C1/00—Combustion apparatus specially adapted for combustion of two or more kinds of fuel simultaneously or alternately, at least one kind of fuel being either a fluid fuel or a solid fuel suspended in a carrier gas or air
- F23C1/08—Combustion apparatus specially adapted for combustion of two or more kinds of fuel simultaneously or alternately, at least one kind of fuel being either a fluid fuel or a solid fuel suspended in a carrier gas or air liquid and gaseous fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
- F23G7/061—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating
- F23G7/065—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating using gaseous or liquid fuel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2209/00—Specific waste
- F23G2209/14—Gaseous waste or fumes
Abstract
The invention discloses a method for burning and treating fuel oil for thermal desorption remediation of contaminated soil, which comprises the steps of atomizing the fuel oil in a fuel oil burner, then contacting and mixing the atomized fuel oil with combustion-supporting air, igniting the fuel oil by an ignition electrode, continuously and stably burning the fuel oil in a combustion chamber, generating high-temperature flue gas, sending the generated high-temperature flue gas into a thermal desorption remediation system for conduction and heat exchange, and sending desorbed organic waste gas generated by the thermal desorption remediation system into the combustion chamber through a back-burning waste gas introduction unit for thermal combustion treatment; the method is carried out by a fuel combustion treatment all-in-one machine, and the all-in-one machine comprises a fuel supply unit, a fuel combustor, a combustion chamber, a secondary air supply unit and a back-burning waste gas introduction unit. The invention provides a combustion treatment method which can use conventional liquid fuels such as light diesel oil and the like as energy sources, has high energy utilization efficiency, controllable secondary pollution, simple, safe, stable and reliable system equipment and has the functions of combustion heat production and waste gas thermal combustion treatment.
Description
Technical Field
The invention relates to a polluted site repairing device in the technical field of polluted site soil and underground water repairing, in particular to a fuel oil combustion treatment method applicable to in-situ thermal desorption or heap thermal desorption repairing of polluted soil.
Background
The Thermal Desorption (Thermal Desorption) technology can be widely applied to the in-situ or ex-situ remediation of organic polluted sites such as volatile organic compounds, semi-volatile organic compounds, petroleum hydrocarbons and the like. The technology heats the polluted soil and/or underground water to be close to or even exceed the boiling point of a target pollutant in a direct or indirect heating mode, promotes the target pollutant to be desorbed, gasified and volatilized or increases the fluidity of the target pollutant by controlling the system temperature and the high-temperature duration time, and then is assisted with an extraction means to separate and remove the target pollutant from a soil medium, thereby realizing the purpose of repairing a polluted site.
The in-situ thermal desorption remediation technology can be implemented in situ in a polluted site, does not need to carry out operations such as excavation and the like on polluted soil, and mainly comprises a site in-situ heating unit, a pollutant in-situ extraction unit, a ground wastewater/waste gas treatment unit and the like. The pile body type thermal desorption restoration technology can be implemented in situ and ex situ in a polluted site, pile bodies are built on the ground after polluted soil is excavated, and then a heating unit and an extraction unit are arranged on the pile bodies and are matched with units for wastewater/waste gas treatment and the like.
The heating unit is the core of the whole in-situ thermal desorption or stack type thermal desorption technology, and converts and transfers energy in different forms such as electric energy, heat energy or chemical energy to a polluted area in modes of resistance heating, electric heat conversion or heat conduction heating after combustion heat generation or steam injection heating, so that the polluted soil and/or underground water is gradually heated to reach a target remediation temperature and is maintained for a certain time, and then the target pollutants can be separated and removed from the originally existing soil medium.
At present, engineering application of an in-situ thermal desorption repair technology or a bulk thermal desorption technology in repairing a domestic polluted site is still limited, and the main reasons for limiting popularization and application of the in-situ thermal desorption repair technology or the bulk thermal desorption technology are that temporary large-scale electricity utilization of part of sites is not easy to obtain, a steam injection heating desorption technology is easily limited by geological conditions and target temperature upper limit, government permission obstacles exist in large-scale storage of fuel gas of part of sites, safety risks are large, energy cost required by heating is high, treatment cost of generated desorption waste gas is high, and the like.
Disclosure of Invention
The invention aims to provide a combustion treatment method with combustion heat production and waste gas thermal combustion treatment functions, aiming at a heating unit and a waste gas treatment unit of an in-situ thermal desorption repair technology or a stack type thermal desorption repair technology, the conventional liquid fuel such as light diesel oil and the like can be used as an energy source, the energy utilization efficiency is high, the secondary pollution is controllable, and the system equipment is simple, safe, stable and reliable.
In order to achieve the purpose, the invention provides a method for burning and treating fuel oil for thermal desorption remediation of contaminated soil, wherein the method comprises the steps of atomizing the fuel oil in a fuel oil burner, then contacting and mixing the atomized fuel oil with combustion air, igniting the fuel oil by an ignition electrode, then continuously and stably burning the fuel oil in a combustion chamber, generating high-temperature flue gas, sending the high-temperature flue gas into a thermal desorption remediation system for conduction heat exchange, and sending desorbed organic waste gas generated by the thermal desorption remediation system into the combustion chamber through a back-burning waste gas introduction unit for thermal combustion treatment; the method is carried out by a fuel combustion treatment all-in-one machine, and the all-in-one machine comprises a fuel supply unit, a fuel combustor, a combustion chamber, a secondary air supply unit and a back-burning waste gas introduction unit.
The method for burning and treating the fuel oil for thermal desorption remediation of the polluted soil is characterized in that the fuel oil supply unit is connected with the fuel oil burner and sends the fuel oil to the fuel oil burner; the combustion chamber is arranged below the fuel oil burner and is communicated with the interior of the fuel oil burner; the secondary air supply unit is connected with the combustion chamber and introduces secondary air into the combustion chamber; the back-burning waste gas leading-in unit is arranged in the middle of the combustion chamber and sends the desorbed organic waste gas generated in the thermal desorption repair process into the fuel oil burner to be ignited.
The method for burning the fuel oil for thermal desorption remediation of the contaminated soil comprises the following steps that the fuel oil supply unit comprises a fuel oil supply pipeline, a fuel oil filter, a fuel oil stop valve, a fuel oil pressure gauge and an oil return stop valve; the fuel supply pipeline comprises a fuel supply main pipe, a fuel supply branch pipe and an oil return pipeline; the fuel supply main pipe is connected with the fuel stop valve through the fuel supply branch pipe and then communicated with the inside of the fuel burner; the oil return pipeline is also communicated with the fuel burner; the fuel oil stop valve and the oil return stop valve are respectively arranged on an oil supply section of the fuel oil supply pipeline and an oil return section of the oil return pipeline; the fuel filter is arranged on a fuel supply pipeline between the fuel stop valve and the fuel supply main pipe; the fuel pressure gauge is arranged on a fuel supply pipeline between the fuel stop valve and the fuel burner.
The method for burning and treating the fuel oil for thermal desorption remediation of the polluted soil comprises a shell, a switch with an indicator light, a controller, a flame detector, a combustion fan with an air door plate, an ignition transformer, an electromagnetic valve, an oil pump, a combustion cylinder with a flame stabilizing disc, an ignition electrode and an oil nozzle.
The method for burning and treating the fuel oil for thermal desorption remediation of the polluted soil comprises the following steps that in the fuel oil burner, a combustion cylinder is arranged at the lower part of the fuel oil burner, and an oil nozzle and an ignition electrode are arranged below the inner part of the combustion cylinder; one end of the oil pump is respectively connected with a fuel supply branch pipe of a fuel supply pipeline and an oil return pipeline, one end of the combustion-supporting fan is communicated with the atmosphere, the other ends of the oil pump and the combustion-supporting fan enter the combustion cylinder through pipelines, an oil nozzle and an ignition electrode are arranged at the bottom end of the pipelines, and electromagnetic valves are arranged on the pipelines between the oil pump and the combustion-supporting fan and the combustion cylinder; the fuel oil enters the fuel oil burner through the fuel oil supply pipeline, is pressurized through the oil pump, is sprayed out at the oil nozzle in the combustion cylinder to form atomized diesel oil droplets, is fully mixed with combustion air introduced by the combustion fan in the combustion cylinder, is ignited by the ignition electrode arranged at the center of the flame stabilizing disc of the combustion cylinder and then is combusted to form flame, and the fuel oil which is not sprayed out by the oil nozzle returns to the oil return pipeline.
The method for burning and treating the fuel oil for thermal desorption remediation of the polluted soil comprises the steps that a switch is arranged on the upper portion of a shell of the fuel oil burner, the switch is connected with a controller, the controller is respectively connected with an oil pump, a combustion fan and an ignition transformer, the ignition transformer is connected with an ignition electrode, and a flame detector is arranged at the position, opposite to the ignition electrode, of an outlet of an oil nozzle.
The method for burning and treating the fuel oil for thermal desorption remediation of the polluted soil comprises the following steps that the combustion chamber is of a vertically arranged through sleeve structure and consists of two layers of concentric cylinders made of heat-resistant metal materials, a combustion area is arranged inside the inner layer cylinder, and an air cooling wall is arranged between the outer part of the inner layer cylinder and the outer layer cylinder; the bottom end of the inner layer cylinder is higher than the bottom end of the outer layer cylinder, or is flush with the bottom end of the outer layer cylinder and is uniformly provided with a plurality of air inlets along the circumference at the bottom of the inner layer cylinder; the upper part of the combustion chamber is sleeved outside the combustion cylinder at the lower part of the fuel oil burner through an inner layer cylinder, and the lower part of the combustion chamber is connected with the top of a heating well for thermal desorption remediation in polluted soil through the bottom end of an outer layer cylinder by adopting a flange and then connected with a smoke exhaust fan; the fuel injector and the ignition electrode are located in a combustion zone of the combustion chamber.
The method for burning and treating the fuel oil for thermal desorption remediation of the polluted soil comprises the following steps that the secondary air supply unit comprises a secondary air pipeline and a secondary air access regulating valve arranged on the secondary air pipeline; one end of the secondary air pipeline is communicated with the atmosphere, and the other end of the secondary air pipeline is communicated between the outer layer cylinder and the inner layer cylinder of the combustion chamber; the secondary air is sent into the space between the outer layer cylinder and the inner layer cylinder of the combustion chamber through a secondary air pipeline by negative pressure generated by the operation of the smoke exhaust fan to form an air cooling wall, and then is sent into the tail end of the inner layer cylinder of the combustion chamber from the bottom of the combustion chamber to be fully mixed with combustion smoke to promote complete combustion and form stable hot air.
The method for the fuel oil combustion treatment for the thermal desorption remediation of the contaminated soil comprises the steps that the back-burning waste gas introducing unit comprises a back-burning waste gas pipeline and a back-burning waste gas access valve arranged on the back-burning waste gas pipeline; one end of the back-burning waste gas leading-in unit is communicated with desorbed organic waste gas generated in the thermal desorption repair process, and the other end of the back-burning waste gas leading-in unit is led into a burning area in an inner-layer cylinder of the burning chamber; the desorbed organic waste gas enters the fuel oil burner through the back-burning waste gas pipeline to be ignited, and the thermal combustion treatment of the organic waste gas is completed.
The method for the fuel oil combustion treatment for the thermal desorption remediation of the polluted soil comprises the following steps: firstly, ignition operation is carried out, a fuel oil stop valve and an oil return stop valve are opened in a flameout state, a combustion fan and secondary air are adjusted to be connected into an adjusting valve, an indicator lamp flickers after a switch is clicked, the combustion fan is started, an oil pump is started, a controller judges whether an ignition condition is met or not according to the states of the oil pump and the combustion fan, then an ignition electrode carries out ignition action, and a combustion state signal is fed back through a flame detector; under the stable condition operation, the indicator lamp keeps a normally-on state, and whether the back-burning waste gas generated by thermal desorption is back-burned or not is selected by opening or closing the back-burning waste gas access valve; in the ignition state, after the switch is pressed again, the fuel burner is flamed out, then the secondary air access regulating valve is closed, and the fuel stop valve and the oil return stop valve are closed; after ignition, the fuel oil burner does not form stable flame or automatically extinguishes flame during operation, the fault state is automatically recorded, and the fuel oil burner automatically cuts off an oil pump and a combustion fan through a controller; the fault state is still remained after power failure and recovery, and the next ignition is carried out by checking the reason and manually clicking the switch.
The method for burning and treating the fuel oil for thermal desorption remediation of the polluted soil, provided by the invention, has the following advantages:
the method is a fuel oil combustion treatment method, adopts a mature, reliable and easily-obtained low-nitrogen combustion type light oil fuel combustor, can convert chemical energy of fuel into heat energy in a mode of burning and generating heat by easily-obtained, safe and stable light diesel oil liquid fuel, directly uses high-temperature flue gas generated by combustion of an all-in-one machine as a heat carrier to heat in-situ soil or stacked soil in a heat conduction mode, and accordingly improves the temperature of polluted soil and realizes desorption and removal of target pollutants. In addition, the high-concentration desorbed organic waste gas generated in the thermal desorption repair process can be sent to a fuel oil combustion treatment method for thermal combustion treatment, and the chemical energy of desorbed organic pollutants can be utilized on the premise of finishing effective treatment of the thermal desorption waste gas, so that the use of fuel is saved. The whole has the outstanding advantages of simple equipment, safety, stability, reliability, high energy utilization efficiency, controllable secondary pollution and the like.
Drawings
Fig. 1 is a schematic structural diagram of the fuel oil combustion treatment method for thermal desorption remediation of contaminated soil according to the invention.
Wherein: 1. a fuel filter; 2. a fuel cut-off valve; 3. a fuel pressure gauge; 4. an oil return stop valve; 5. a housing; 6. an oil pump; 7. a combustion can; 8. an oil jet; 9. secondary air is connected into the regulating valve; 10. a combustion chamber; 11. an air-cooled wall; 12. a back-burning waste gas access valve; 13. a fuel-fired burner; 14. a switch; 15. a controller; 16. a flame detector; 17. a combustion fan; 18. an ignition transformer; 19. an ignition electrode; 20. an electromagnetic valve; 21. a combustion zone.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
As shown in fig. 1, in the method for burning fuel for thermal desorption remediation of contaminated soil provided by the invention, fuel is atomized in a fuel burner 13 and then is contacted and mixed with combustion air, and the fuel is ignited by an ignition electrode 19 and then continuously and stably burned in a combustion chamber 10 to generate high-temperature flue gas which is sent to a thermal desorption remediation system for conduction heat exchange; the desorbed organic waste gas generated by the thermal desorption repair system is fed into the combustion chamber 10 through the back-burning waste gas introduction unit for thermal combustion treatment.
The method is carried out by a fuel combustion treatment all-in-one machine, and the all-in-one machine mainly comprises a fuel supply unit, a fuel combustor 13, a combustion chamber 10, a secondary air supply unit, a back-burning waste gas introduction unit and other facilities. The fuel supply unit is connected with the fuel combustor 13 and sends fuel to the fuel combustor 13; the combustion chamber 10 is arranged below the fuel oil burner 13 and is communicated with the interior of the fuel oil burner 13; the secondary air supply unit is connected with the combustion chamber 10 and introduces secondary air into the combustion chamber 10; the back-burning waste gas leading-in unit is arranged in the middle of the combustion chamber 10, and the desorbed organic waste gas generated in the thermal desorption repair process is sent into the fuel oil burner 13 to be ignited.
The fuel supply unit comprises a fuel supply pipeline, a fuel filter 1, a fuel stop valve 2, a fuel pressure gauge 3 and an oil return stop valve 4.
In the fuel supply unit, a fuel supply pipeline comprises a fuel supply main pipe, a fuel supply branch pipe and an oil return pipeline; the fuel supply main pipe is connected with the fuel stop valve 2 through the fuel supply branch pipe and then communicated with the fuel burner 13; the return line is also in communication with the fuel burner 13. The fuel oil supply main pipe is connected with the fuel oil stop valve 2 through a branch pipe, and then is pumped and pressurized by a self-provided oil pump 6 in the combustor through a fuel oil supply pipeline and sent into the combustor, part of the fuel oil is combusted through an oil nozzle 8 of the combustor, and the rest of the fuel oil is sent back to the fuel oil return main pipe through an oil return pipeline.
The fuel stop valve 2 and the oil return stop valve 4 are respectively arranged on the oil supply section of the fuel supply pipeline and the oil return section of the oil return pipeline, and the fuel supply can be conveniently and timely cut off by closing the stop valves when abnormal conditions occur in the operation of the fuel combustion processing method, so that the safety of equipment is ensured.
The fuel filter 1 is arranged on a fuel supply pipeline between the fuel stop valve 2 and a fuel supply main pipe; the fuel pressure gauge 3 is arranged on a fuel supply pipeline between the fuel cut-off valve 2 and the fuel burner 13.
The fuel oil burner 13 adopts a mature and reliable low-nitrogen combustion type light oil burner and comprises a shell 5, a switch 14 provided with an indicator light, a controller 15, a flame detector 16, a combustion fan 17 provided with an air door plate, an ignition transformer 18, an electromagnetic valve 20, an oil pump 6, a combustion cylinder 7 provided with a flame stabilizing disc, an ignition electrode 19 and an oil nozzle 8. The combustor can adjust the combustion load in a larger range by replacing the fuel injection nozzles 8 of different models of the combustor, so that the combustion power adjustment of different levels is realized, and the combustion power can be further finely adjusted by adjusting the fuel injection pressure of the oil pump 6.
The combustion tube 7 of the fuel oil burner 13 is arranged at the lower part of the fuel oil burner 13, and the oil nozzle 8 and the ignition electrode 19 are arranged at the lower part of the inner part of the combustion tube 7; one end of the oil pump 6 is respectively connected with a fuel supply branch pipe of a fuel supply pipeline and an oil return pipeline, one end of the combustion fan 17 is communicated with the atmosphere, the other ends of the oil pump 6 and the combustion fan 17 enter the combustion cylinder 7 through pipelines, an oil nozzle 8 and an ignition electrode 19 are arranged at the bottom end of the pipelines, and an electromagnetic valve 20 is arranged on the pipelines between the oil pump 6 and the combustion fan 17 and the combustion cylinder 7.
The fuel oil enters the fuel oil burner 13 through the fuel oil supply pipeline, is pressurized by the oil pump 6, is sprayed out at the oil nozzle 8 in the combustion cylinder 7 to form atomized diesel oil droplets, is fully mixed with combustion air introduced by the combustion fan 17 in the combustion cylinder 7, is ignited by the ignition electrode 19 arranged at the center of the flame stabilizing disc of the combustion cylinder 7 to form flame, and the fuel oil which is not sprayed out by the oil nozzle 8 returns to the oil return pipeline. The combustor is provided with wider combustion-supporting air adjusting capability by the air induction of the built-in combustion-supporting fan 17 under the action of negative pressure formed by the operation of the smoke exhaust fan at the tail end of the smoke pipeline of the thermal desorption system, and the optimal air-fuel ratio and flame shape control can be achieved.
The switch 14 of the fuel burner 13 is arranged on the upper portion of the shell 5 of the fuel burner 13, the switch 14 is connected with the controller 15 and used for controlling manual ignition of the burner, the controller 15 is respectively connected with the oil pump 6, the combustion fan 17 and the ignition transformer 18, the ignition transformer 18 is connected with the ignition electrode 19, the flame detector 16 is arranged at the position, opposite to the ignition electrode 19, of the outlet of the fuel spray nozzle 8 and used for detecting whether flame is burnt at the position of the burner or not, if no flame is burnt at the position of the outlet of the fuel spray nozzle 8, the oil pump 6 stops working, the electromagnetic valve 20 in the burner is closed, and the burner is automatically turned off.
The combustion chamber 10 is a vertically arranged through sleeve structure and consists of two layers of concentric cylinders made of heat-resistant metal materials, a combustion area 21 is arranged inside the inner layer cylinder, and an air cooling wall 11 is arranged between the outside of the inner layer cylinder and the outer layer cylinder; the bottom end of the inner layer cylinder is higher than that of the outer layer cylinder, or is flush with the bottom end of the outer layer cylinder and is uniformly provided with a plurality of air inlets along the circumference at the bottom of the inner layer cylinder.
The upper part of the combustion chamber 10 is sleeved outside the combustion cylinder 7 at the lower part of the fuel oil burner 13 through an inner layer cylinder, namely, the upper part of the combustion chamber 10 is connected with the combustion cylinder 7 of the burner in a socket joint mode, the lower part of the combustion chamber 10 is connected with the top of a heating well in a system for thermal desorption remediation in contaminated soil through the bottom end of an outer layer cylinder by adopting a flange, and then is connected with a smoke exhaust fan; the fuel injector 8 and the ignition electrode 19 are located in a combustion zone 21 of the combustion chamber 10. The secondary air which continuously flows is introduced into the outer ring jacket between the outer cylinder and the inner cylinder through the secondary air supply unit by the negative pressure formed by the operation of the smoke exhaust fan to form an air cooling wall 11, so that the heat insulation effect between the inner cylinder and the outer cylinder is realized, and the temperature of the outer surface of the combustion chamber 10 is effectively reduced. The combustion flame continuously and stably burns in the inner ring of the combustion chamber 10 and generates high-temperature flue gas.
The combustion chamber 10 is installed below the burner, so that the temperature of the outer wall of the combustion chamber 10 can be reduced to the maximum extent under the condition of maintaining the efficient and stable combustion state of the flame in the combustion chamber 10, the energy is saved, and the occurrence of safety accidents is reduced.
The secondary air supply unit comprises a secondary air pipeline and a secondary air access adjusting valve 9 arranged on the secondary air pipeline; one end of the secondary air pipeline is communicated with the atmosphere, and the other end of the secondary air pipeline is introduced between the outer layer cylinder and the inner layer cylinder of the combustion chamber 10; through the negative pressure that the operation of smoke exhaust fan produced, the overgrate air pipeline sends overgrate air into and forms air-cooled wall 11 between combustion chamber 10 outer drum and the inlayer drum, sends into the terminal of the inlayer drum of combustion chamber 10 from combustion chamber 10 bottom again, and the abundant mixing promotes complete combustion and forms stable hot-blast with the burning flue gas.
That is, the secondary air is introduced into the combustion chamber 10 through the secondary air pipeline through the negative pressure generated by the operation of the smoke exhaust fan at the tail end of the smoke pipeline of the thermal desorption system, is sent into the tail end of the combustion chamber 10 from the bottom of the combustion chamber 10 after forming an air cooling wall 11 through the outer ring of the combustion chamber 10, and is fully mixed with the combustion smoke to promote complete combustion and form stable hot air. The secondary air quantity can be adjusted by the opening degree of the secondary air connection adjusting valve 9 so as to control the temperature and the flow of the high-temperature flue gas heated by the thermal desorption system.
The back-burning waste gas introducing unit comprises a back-burning waste gas pipeline and a back-burning waste gas access valve 12 arranged on the back-burning waste gas pipeline; one end of the back-burning waste gas leading-in unit is communicated with desorption organic waste gas generated in the thermal desorption repair process, and the other end is led into a burning zone 21 in an inner-layer cylinder of the combustion chamber 10; the desorbed organic waste gas enters the fuel oil burner 13 through the back-burning waste gas pipeline to be ignited, and the thermal combustion treatment of the organic waste gas is completed.
The leading-in unit of back-burning waste gas is located the combustion chamber 10 middle part, and the desorption organic waste gas accessible back-burning waste gas access valve 12 control that the extraction produced in the thermal desorption repair system operation process is got into combustion chamber 10 by the back-burning waste gas pipeline, contacts with burning flame after preheating, forms the thermal power combustion of organic waste gas and handles for the combustor has the heat production of burning concurrently, waste gas thermal power combustion handles and organic pollutant chemical energy recycle function. The desorption organic waste gas flow sent into the combustion chamber 10 can be adjusted through the desorption waste gas access valve according to actual conditions such as the flow, the waste gas humidity and the organic substance concentration generated by the desorption organic waste gas flow, the stable combustion of the combustor can be realized by the design, the desorption organic waste gas can be subjected to thermal combustion treatment in a high-temperature section as much as possible, the waste gas treatment efficiency is improved, and the operation cost is reduced.
In the method, the operation process of the fuel combustion treatment integrated machine is as follows: firstly, ignition operation is carried out, in a flameout state, the fuel oil stop valve 2 and the oil return stop valve 4 are opened, the combustion-supporting fan 17 and secondary air are adjusted to be connected into the adjusting valve 9, after the switch 14 is pressed, the indicator lamp 14 flickers, the combustion-supporting fan 17 is started, the oil pump 6 is started, the controller 15 judges whether an ignition condition is met according to the states of the oil pump 6 and the combustion-supporting fan 17, then the ignition electrode 19 carries out ignition action, and a combustion state signal is fed back through the flame detector 16. Under the stable condition operation, the indicator lamp 14 keeps the normal-on state, and whether the back-burning waste gas generated by thermal desorption is back-burnt can be selected by opening or closing the back-burning waste gas access valve 12 according to the condition. In the ignition state, when the switch 14 is pressed again, the fuel burner 13 is turned off. Then the secondary air inlet regulating valve 9 is closed, and the fuel cut-off valve 2 and the oil return cut-off valve 4 are closed. After ignition, the fuel burner 13 does not form stable flame or the flame is automatically extinguished during operation, and the system records the fault state, and the fuel burner 13 automatically cuts off the oil pump 6 and the combustion fan 17 through the controller 15. The system fault condition remains after the power failure and recovery, and the next ignition can be performed by checking the cause and manually clicking the switch 14.
The method for fuel oil combustion treatment for thermal desorption remediation of contaminated soil provided by the invention is further described below with reference to the following examples.
Example 1
A method for burning and processing fuel oil used for thermal desorption remediation of contaminated soil is characterized in that fuel oil is atomized in a fuel oil burner 13 and then is contacted and mixed with combustion-supporting air, the fuel oil is ignited by an ignition electrode 19 and then continuously and stably burnt in a combustion chamber 10, and high-temperature flue gas is generated and sent to a thermal desorption remediation system for conduction and heat exchange; the desorbed organic waste gas generated by the thermal desorption repair system is fed into the combustion chamber 10 through the back-burning waste gas introduction unit for thermal combustion treatment.
The method is mainly carried out by an integrated machine consisting of a fuel supply unit, a secondary air supply unit, a back-burning waste gas introduction unit, a fuel burner 13, a combustion chamber 10 and the like.
The fuel supply unit is connected with the fuel combustor 13 and sends fuel to the fuel combustor 13; the combustion chamber 10 is arranged below the fuel oil burner 13 and is communicated with the interior of the fuel oil burner 13; the secondary air supply unit is connected with the combustion chamber 10 and introduces secondary air into the combustion chamber 10; the back-burning waste gas leading-in unit is arranged in the middle of the combustion chamber 10, and the desorbed organic waste gas generated in the thermal desorption repair process is sent into the fuel oil burner 13 to be ignited.
The fuel oil fed by the fuel oil supply unit is atomized into fine droplets through an oil nozzle 8 of the fuel oil burner 13, the fine droplets are fully mixed with combustion air introduced by a combustion fan 17 arranged in the fuel oil burner 13, the fine droplets are continuously and stably combusted in the combustion chamber 10 under the action of a combustion cylinder 7 of the fuel oil burner 13 and a flame disc after being ignited by an ignition electrode 19, and the generated high-temperature flue gas is introduced into a thermal desorption system for conduction and heat exchange through the negative pressure of a smoke exhaust fan at the tail end of a flue gas pipeline of the thermal desorption system. The desorbed organic waste gas generated by the thermal desorption repair system can be sent into the combustion chamber 10 through the back-burning waste gas introduction unit for thermal combustion treatment.
The structure of each part of the all-in-one machine is specifically explained as follows.
A fuel supply unit: the fuel oil is delivered to a fuel oil burner 13 of the fuel oil combustion processing method from a fuel oil supply pipeline through a fuel oil filter 1 and a fuel oil stop valve 2 in sequence, and impurities such as particles, moisture and the like in the fuel oil are removed through the fuel oil filter 1; the fuel cut-off valve 2 is in a manual operation mode, is normally opened during operation, and is kept closed to cut off the connection with a fuel supply pipeline when a system is closed or maintained; the pressure of the fuel pipeline is displayed by a fuel pressure gauge 3 and is used as an indication for debugging and operation regulation of equipment; after fuel oil is sucked and pressurized by an oil pump 6 in the shell 5, atomized diesel oil droplets with corresponding oil quantity are sprayed out from an oil nozzle 8 through a combustion cylinder 7; the fuel which is not sprayed out by the fuel spray nozzle 8 is conveyed to the oil return pipeline through the oil return stop valve 4.
Secondary air supply unit: secondary air enters the bottom of the combustion chamber 10 through a secondary air access adjusting valve 9 along an air cooling wall 11 of the outer ring of the combustion chamber 10, and enters the inner ring of the combustion chamber 10 through air inlets uniformly distributed at the bottom of the combustion chamber 10. The addition of the secondary air is manually adjusted by the secondary air access adjusting valve 9 and is mixed with the combustion flue gas to form stable hot air.
A back-burning exhaust gas introduction unit: the back-burning waste gas access valve 12 is positioned in the middle of the combustion chamber 10, and the desorbed organic waste gas enters the fuel oil burner 13 through the back-burning waste gas pipeline to be ignited to form the thermal combustion treatment of the organic waste gas, so that higher combustion temperature and higher combustion efficiency are realized.
An oil burner: after the switch 14 is pressed, the fuel burner 13 is started, the controller 15 starts a system starting instruction and simultaneously the flame detector 16 starts monitoring, the combustion fan 17 is started, and pre-purging starts. After the pre-purging stage is completed, the ignition transformer 18 starts to work, an electric arc is formed between the ignition electrodes 19, the electromagnetic valve 20 is opened, fuel oil is conveyed to the fuel injection nozzle 8 by the pressure of the oil pump 6, and the combustion air and the fuel oil form a combustion flame detector 16 for continuous monitoring.
An ignition electrode 19 and a flame detector 16 are arranged on the upper side of the outlet of the fuel combustor 13, and the functions of high-pressure ignition and flame detection are respectively realized. Atomized diesel oil droplets sprayed by the oil nozzle 8 are fully mixed with combustion air, are ignited by the ignition electrode 19 and then stably burn, and a combustion state signal is fed back through the flame detector 16.
A combustion chamber: the combustion chamber 10 is a cylindrical sleeve structure, the inner ring is a combustion area 21, the outer ring is an air cooling wall 11, and secondary air and back-burning waste gas access pipelines are arranged on the side surfaces. Atomized diesel oil droplets sprayed out of an oil nozzle 8 in a fuel oil burner 13 and combustion air introduced by a combustion fan 17 are fully mixed near a flame stabilizing disc of a combustion cylinder 7, the mixture is ignited by an ignition electrode 19 at the center of the flame stabilizing disc to form stable combustion flame in a combustion chamber 10, desorption waste gas is introduced through a back combustion waste gas access valve 12, a combustion area 21 in the combustion chamber 10 is in contact with the combustion flame to realize complete combustion, high-temperature flue gas generated in the combustion chamber 10 is introduced into a heating pipe for heating soil through negative pressure generated by operation of a flue gas fan at the tail end of a thermal desorption repair system to perform indirect conduction heat exchange, and thermal desorption repair treatment is realized.
The operation process of the all-in-one machine in the method is as follows:
and (3) ignition operation: under the flameout state, the fuel oil stop valve 2 and the oil return stop valve 4 are opened, the combustion fan 17 and the secondary air are adjusted to be connected into the adjusting valve 9, after the switch 14 is pressed, the indicator lamp 14 flickers, the combustion fan 17 is started, the oil pump 6 is started, the controller 15 judges whether the ignition condition is met according to the states of the oil pump 6 and the combustion fan 17, then the ignition electrode 19 performs the ignition action, and the flame detector 16 feeds back a combustion state signal.
Under the stable condition operation, the indicator lamp 14 keeps the normal-on state, and whether the back-burning waste gas generated by thermal desorption is back-burnt can be selected by opening or closing the back-burning waste gas access valve 12 according to the condition.
In the ignition state, when the switch 14 is pressed again, the fuel burner 13 is turned off. Then the secondary air inlet regulating valve 9 is closed, and the fuel cut-off valve 2 and the oil return cut-off valve 4 are closed.
After ignition, the fuel burner 13 does not form stable flame or the flame is automatically extinguished during operation, and the system records the fault state, and the fuel burner 13 automatically cuts off the oil pump 6 and the combustion fan 17 through the controller 15.
The system fault condition remains after the power failure and recovery, and the next ignition can be performed by checking the cause and manually clicking the switch 14.
The method for burning and treating the fuel oil for thermal desorption remediation of the polluted soil, which is provided by the invention, aims at a heating unit and a waste gas treatment unit of an in-situ thermal desorption remediation technology or a stack type thermal desorption remediation technology, adopts a mature and reliable low-nitrogen burning type light oil burner, can use the fuel oil such as light diesel oil and the like which has wide sources and is safe and stable, namely the conventional liquid fuel, as an energy source, has the advantages of simple, safe, stable and reliable system equipment, heat production by burning, thermal combustion treatment of waste gas and chemical energy recycling of organic pollutants, high energy utilization efficiency and controllable secondary pollution, and can provide a stable high-temperature burning smoke heat source and a good thermal treatment solution for the thermal desorption of the polluted soil for the thermal desorption remediation technology.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (10)
1. A method for burning and processing fuel oil for thermal desorption remediation of contaminated soil is characterized in that the method is that fuel oil is atomized in a fuel oil burner and then is contacted and mixed with combustion-supporting air, the fuel oil is ignited by an ignition electrode and then continuously and stably burned in a combustion chamber, high-temperature flue gas is generated and sent into a thermal desorption remediation system for conduction and heat exchange, and desorbed organic waste gas generated by the thermal desorption remediation system is sent into the combustion chamber through a back-burning waste gas introduction unit for thermal combustion processing; the method is carried out by a fuel combustion treatment all-in-one machine, and the all-in-one machine comprises a fuel supply unit, a fuel combustor, a combustion chamber, a secondary air supply unit and a back-burning waste gas introduction unit.
2. The method for the fuel oil combustion treatment for the thermal desorption remediation of the contaminated soil as claimed in claim 1, wherein the fuel oil supply unit is connected with the fuel oil burner and feeds the fuel oil to the fuel oil burner; the combustion chamber is arranged below the fuel oil burner and is communicated with the interior of the fuel oil burner; the secondary air supply unit is connected with the combustion chamber and introduces secondary air into the combustion chamber; the back-burning waste gas leading-in unit is arranged in the middle of the combustion chamber and sends the desorbed organic waste gas generated in the thermal desorption repair process into the fuel oil burner to be ignited.
3. The method for the fuel combustion treatment for the thermal desorption remediation of the contaminated soil as claimed in claim 2, wherein the fuel supply unit comprises a fuel supply pipeline, a fuel filter, a fuel shutoff valve, a fuel pressure gauge and a return shutoff valve; the fuel supply pipeline comprises a fuel supply main pipe, a fuel supply branch pipe and an oil return pipeline; the fuel supply main pipe is connected with the fuel stop valve through the fuel supply branch pipe and then communicated with the inside of the fuel burner; the oil return pipeline is also communicated with the fuel burner; the fuel oil stop valve and the oil return stop valve are respectively arranged on an oil supply section of the fuel oil supply pipeline and an oil return section of the oil return pipeline; the fuel filter is arranged on a fuel supply pipeline between the fuel stop valve and the fuel supply main pipe; the fuel pressure gauge is arranged on a fuel supply pipeline between the fuel stop valve and the fuel burner.
4. The method for the fuel combustion treatment for the thermal desorption remediation of the contaminated soil according to claim 3, wherein the fuel combustor comprises a casing, a switch with an indicator light, a controller, a flame detector, a combustion fan with an air door plate, an ignition transformer, an electromagnetic valve, an oil pump, a combustion cylinder with a flame stabilizing disc, an ignition electrode and an oil nozzle.
5. The method for the fuel combustion treatment for the thermal desorption remediation of the contaminated soil according to claim 4, wherein the fuel combustor is provided with a combustion cylinder arranged at the lower part of the fuel combustor, and the fuel nozzle and the ignition electrode are arranged below the inner part of the combustion cylinder; one end of the oil pump is respectively connected with a fuel supply branch pipe of a fuel supply pipeline and an oil return pipeline, one end of the combustion-supporting fan is communicated with the atmosphere, the other ends of the oil pump and the combustion-supporting fan enter the combustion cylinder through pipelines, an oil nozzle and an ignition electrode are arranged at the bottom end of the pipelines, and electromagnetic valves are arranged on the pipelines between the oil pump and the combustion-supporting fan and the combustion cylinder; the fuel oil enters the fuel oil burner through the fuel oil supply pipeline, is pressurized through the oil pump, is sprayed out at the oil nozzle in the combustion cylinder to form atomized diesel oil droplets, is fully mixed with combustion air introduced by the combustion fan in the combustion cylinder, is ignited by the ignition electrode arranged at the center of the flame stabilizing disc of the combustion cylinder and then is combusted to form flame, and the fuel oil which is not sprayed out by the oil nozzle returns to the oil return pipeline.
6. The method for the fuel combustion treatment for the thermal desorption remediation of the contaminated soil as claimed in claim 4, wherein the fuel burner is provided with a switch arranged at the upper part of a casing of the fuel burner, the switch is connected with a controller, the controller is respectively connected with the oil pump, the combustion fan and the ignition transformer, the ignition transformer is connected with the ignition electrode, and the flame detector is arranged at the position of the outlet of the oil nozzle opposite to the ignition electrode.
7. The fuel oil combustion treatment method for the thermal desorption remediation of the contaminated soil as claimed in claim 2, wherein the combustion chamber is of a vertically arranged through sleeve structure and is composed of two layers of concentric cylinders made of heat-resistant metal materials, a combustion area is arranged inside the inner layer cylinder, and an air cooling wall is arranged between the outside of the inner layer cylinder and the outer layer cylinder; the bottom end of the inner layer cylinder is higher than the bottom end of the outer layer cylinder, or is flush with the bottom end of the outer layer cylinder and is uniformly provided with a plurality of air inlets along the circumference at the bottom of the inner layer cylinder; the upper part of the combustion chamber is sleeved outside the combustion cylinder at the lower part of the fuel oil burner through an inner layer cylinder, and the lower part of the combustion chamber is connected with the top of a heating well for thermal desorption remediation in polluted soil through the bottom end of an outer layer cylinder by adopting a flange and then connected with a smoke exhaust fan; the fuel injector and the ignition electrode are located in a combustion zone of the combustion chamber.
8. The method for fuel oil combustion treatment for thermal desorption remediation of contaminated soil according to claim 2, wherein the secondary air supply unit comprises a secondary air pipeline and a secondary air access regulating valve installed on the secondary air pipeline; one end of the secondary air pipeline is communicated with the atmosphere, and the other end of the secondary air pipeline is communicated between the outer layer cylinder and the inner layer cylinder of the combustion chamber; the secondary air is sent into the space between the outer layer cylinder and the inner layer cylinder of the combustion chamber through a secondary air pipeline by negative pressure generated by the operation of the smoke exhaust fan to form an air cooling wall, and then is sent into the tail end of the inner layer cylinder of the combustion chamber from the bottom of the combustion chamber to be fully mixed with combustion smoke to promote complete combustion and form stable hot air.
9. The method for fuel oil combustion treatment for thermal desorption remediation of contaminated soil according to claim 2, wherein the back-burning exhaust gas introduction unit comprises a back-burning exhaust gas pipeline and a back-burning exhaust gas inlet valve mounted on the back-burning exhaust gas pipeline; one end of the back-burning waste gas leading-in unit is communicated with desorbed organic waste gas generated in the thermal desorption repair process, and the other end of the back-burning waste gas leading-in unit is led into a burning area in an inner-layer cylinder of the burning chamber; the desorbed organic waste gas enters the fuel oil burner through the back-burning waste gas pipeline to be ignited, and the thermal combustion treatment of the organic waste gas is completed.
10. The fuel oil combustion processing method for the thermal desorption remediation of the polluted soil according to any one of claims 1 to 9, wherein the operation process of the fuel oil combustion processing all-in-one machine comprises the following steps: firstly, ignition operation is carried out, a fuel oil stop valve and an oil return stop valve are opened in a flameout state, a combustion fan and secondary air are adjusted to be connected into an adjusting valve, an indicator lamp flickers after a switch is clicked, the combustion fan is started, an oil pump is started, a controller judges whether an ignition condition is met or not according to the states of the oil pump and the combustion fan, then an ignition electrode carries out ignition action, and a combustion state signal is fed back through a flame detector; under the stable condition operation, the indicator lamp keeps a normally-on state, and whether the back-burning waste gas generated by thermal desorption is back-burned or not is selected by opening or closing the back-burning waste gas access valve; in the ignition state, after the switch is pressed again, the fuel burner is flamed out, then the secondary air access regulating valve is closed, and the fuel stop valve and the oil return stop valve are closed; after ignition, the fuel oil burner does not form stable flame or automatically extinguishes flame during operation, the fault state is automatically recorded, and the fuel oil burner automatically cuts off an oil pump and a combustion fan through a controller; the fault state is still remained after power failure and recovery, and the next ignition is carried out by checking the reason and manually clicking the switch.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114472498A (en) * | 2022-01-28 | 2022-05-13 | 杰瑞环保科技有限公司 | In-situ remediation method and system suitable for petroleum hydrocarbon contaminated site |
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Address after: 200001 floor 26, Gangtai Plaza, 700 Yan'an East Road, Huangpu District, Shanghai Applicant after: SHANGHAI GREENMENT ENVIRONMENTAL TECHNOLOGIES CO. L Address before: 200083 Room 203, building 5, No. 500, Memorial Road, Hongkou District, Shanghai Applicant before: SHANGHAI GREENMENT ENVIRONMENTAL TECHNOLOGIES CO. L |
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