CN113909288A - Efficient and energy-saving heap construction thermal desorption device for organic contaminated soil remediation - Google Patents
Efficient and energy-saving heap construction thermal desorption device for organic contaminated soil remediation Download PDFInfo
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- CN113909288A CN113909288A CN202111028919.8A CN202111028919A CN113909288A CN 113909288 A CN113909288 A CN 113909288A CN 202111028919 A CN202111028919 A CN 202111028919A CN 113909288 A CN113909288 A CN 113909288A
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/08—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating
- F23G5/12—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating using gaseous or liquid 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
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
- F23G5/46—Recuperation of heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/50—Control or safety arrangements
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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
Abstract
The invention discloses a high-efficiency energy-saving pile-building thermal desorption device for repairing organic contaminated soil, which heats a treated soil pile at high temperature through a first heating pipe through which high-temperature hot gas flows, then extracts gas-phase organic pollutants desorbed from the treated soil pile by a gas-phase extraction system into a gas storage tank, separates the gas-phase organic pollutants into combustible organic gas and sewage by a gas-liquid separator, conveys the combustible organic gas as auxiliary fuel through an air distribution pipeline, and burns the combustible organic gas and the gas supplied by a gas supply system in a first combustor to generate the high-temperature hot gas; therefore, the invention can carry out resource utilization on the extracted gas-phase organic pollutants while carrying out thermal desorption treatment on the organic pollutants on the treated soil pile to repair the organic polluted soil, reduces the consumption of fuel gas, reduces the conformity of tail gas purification treatment, and avoids the problems of resource waste and large waste gas treatment load caused by directly using the high-concentration gas-phase organic pollutants as waste gases.
Description
Technical Field
The invention relates to an ex-situ thermal desorption technology of polluted soil, in particular to an efficient and energy-saving pile-building thermal desorption device for repairing organic polluted soil.
Background
The thermal desorption technology is a technology which heats the polluted soil to a boiling point higher than the target polluted soil through direct or indirect heat exchange, controls the heating temperature and the retention time of a system to selectively promote the polluted soil to generate physical and chemical changes such as volatilization, cracking and the like, greatly improves the fluidity of the target pollutant, promotes the target pollutant to be separated and removed from soil particles, and enables more pollutants to enter a gas phase or a liquid phase. The thermal desorption technology has a good treatment effect on organic pollutants such as VOCs and SVOCs in the polluted soil, is divided according to different restoration positions and can be divided into ectopic thermal desorption and in-situ thermal desorption.
The application of the heterotopic thermal desorption technology in the actual field restoration is wide, the method is suitable for treating most of organic contaminated soil, but the following defects still limit the practicability of the application of the technology: firstly, the concentration of organic matters in the extracted tail gas is high, and the organic matters are directly used as waste gas for treatment, so that the usable part of the organic waste gas is wasted, and the waste gas treatment load is increased; secondly, the temperature of the gas at the outlet of the heating system is generally 200-400 ℃, and the gas is not recycled, so that a large amount of energy is wasted.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: provides a high-efficiency energy-saving pile-building thermal desorption device for repairing organic contaminated soil.
The technical scheme adopted by the invention is as follows:
the utility model provides a be used for prosthetic energy-efficient heap thermal desorption device of building of organic contaminated soil which characterized in that includes: the gas-liquid separator comprises a gas supply system, a heating loop, a gas phase extraction system and a gas storage tank provided with a gas-liquid separator;
the heating circuit comprises a first burner and a first heating pipe; the first heating pipe is buried in the treated soil pile, the gas supply system supplies gas to a gas inlet of a first burner, an outlet of the first burner is connected with an inlet of the first heating pipe, and an outlet of the first heating pipe is communicated with a tail gas treatment system; wherein, in the case that the heating circuit is not provided with the first heat exchanger according to the following embodiments, the outlet of the first heating pipe may be directly communicated with the exhaust gas treatment system through a pipeline.
The gas phase extraction system is used for extracting gas in the soil pile to be treated, an outlet of the gas phase extraction system is connected with an inlet of the gas storage tank, a gas outlet of the gas storage tank is communicated with a gas inlet of the first combustor through a gas distribution pipeline, and the gas distribution pipeline is provided with an air extractor and is communicated with a gas outlet of an air blower; wherein, under the condition that the heating circuit is not provided with the first heat exchanger of the following embodiment, the air outlet of the air storage tank can be directly communicated with the air inlet of the first combustor through an air distribution pipeline.
Therefore, the working principle of the high-efficiency energy-saving reactor-building thermal desorption device is as follows:
the gas supplied by the gas supply system is combusted in the first combustor to generate high-temperature hot gas, the high-temperature hot gas enters the first heating pipe and heats the soil pile to be treated in a heat conduction mode so as to promote organic pollutants to be desorbed from the soil pile to be treated into gas-phase organic pollutants; and the flue gas output from the outlet of the first heating pipe is finally led to an exhaust gas treatment system for exhaust gas purification treatment.
The gas phase extraction system extracts the gas phase organic pollutants in the treated soil pile in an extraction mode, and the gas phase organic pollutants enter the gas storage tank and are separated into combustible organic gas and sewage through the gas-liquid separator; and then the air extractor pumps the combustible organic gas in the air storage tank into the air distribution pipeline, the blower pumps the outside air into the air distribution pipeline, the combustible organic gas and the air are mixed in the air distribution pipeline according to a certain flow proportion and finally lead to the air inlet of the first combustor, so that: combustible organic gas is used as auxiliary fuel to be combusted with fuel gas supplied by a fuel gas supply system in the first combustor to generate the high-temperature hot gas.
Therefore, the invention can carry out resource utilization on the extracted gas-phase organic pollutants while carrying out thermal desorption treatment on the organic pollutants on the treated soil pile to repair the organic polluted soil, reduces the consumption of fuel gas, reduces the conformity of tail gas purification treatment, and avoids the problems of resource waste and large waste gas treatment load caused by directly using the high-concentration gas-phase organic pollutants as waste gases.
Preferably: referring to fig. 3, the first heating pipe is provided with a plurality of slits at intervals along a length direction thereof, and a binding wire is wound around each of the slits, so that: when the air pressure in the first heating pipe is lower than a preset air pressure threshold value, the strapping line closes the gap to prevent soil from entering the first heating pipe from the gap; when the air pressure in the first heating pipe is higher than the air pressure threshold value, the gap is opened by higher air pressure, and high-temperature hot air in the first heating pipe can flow out to the soil pile to be treated through the gap. Wherein the width of the gap is preferably 1mm, and the binding wire is preferably a steel wire.
Therefore, when the air pressure in the first heating pipe is lower than a preset air pressure threshold value, high-temperature hot air enters the first heating pipe, and the processed soil pile is heated in a heat conduction mode; when the air pressure in the first heating pipe is higher than the air pressure threshold value, the processed soil pile is directly heated by high-temperature hot air flowing out from a gap in addition to the heating by the heat conduction mode; therefore, the remediation efficiency of the organic contaminated soil can be improved, the heat taken away by the discharged flue gas can be reduced, and the energy utilization efficiency in the heating process is improved.
As a preferred embodiment of the present invention: the heating loop further comprises a first heat exchanger, a second burner, a second heating pipe and a second heat exchanger;
the outlet of the first heating pipe passes through the first heat exchanger and then is led to an exhaust gas treatment system, namely: an outlet of the first heating pipe is connected with a heat path inlet of a first heat exchanger, and a heat path outlet of the first heat exchanger is connected with the tail gas treatment system through a tail gas pipeline; and the gas outlet of the gas storage tank is connected with the second heat exchanger through a gas distribution pipeline and then is communicated to the gas inlet of the first combustor, namely: the air distribution pipeline is connected with a cold path inlet of a second heat exchanger, and a cold path outlet of the second heat exchanger is connected with an air inlet of the first combustor through a first auxiliary fuel pipe;
the second heating pipe is embedded in the treated soil pile, the gas supply system supplies gas to a gas inlet of a second combustor, an outlet of the second combustor is connected with an inlet of the second heating pipe, an outlet of the second heating pipe is connected with a hot path inlet of a second heat exchanger, and a hot path outlet of the second heat exchanger is connected with the tail gas treatment system through a tail gas pipeline; the air distribution pipeline is connected with a cold path inlet of a first heat exchanger, and a cold path outlet of the first heat exchanger is connected with an air inlet of a second combustor through a second auxiliary fuel pipe;
and the first burner is arranged adjacent to the second heat exchanger and the second burner is arranged adjacent to the first heat exchanger such that the first auxiliary fuel pipe and the second auxiliary fuel pipe are as short as possible.
Therefore, the flue gas output from the outlet of the first heating pipe can be output to the tail gas treatment system through the heat path of the first heat exchanger and then through the tail gas pipeline, and the flue gas output from the outlet of the second heating pipe can be output to the tail gas treatment system through the heat path of the second heat exchanger and then through the tail gas pipeline, so as to carry out tail gas purification treatment;
the combustible organic gas and the air mixed in the air distribution pipeline are divided into two paths, one path of the combustible organic gas and the air enters the air inlet of the second combustor through the cold path of the first heat exchanger and the second auxiliary fuel pipe, and the other path of the combustible organic gas and the air enters the air inlet of the first combustor through the cold path of the second heat exchanger and the first auxiliary fuel pipe to participate in combustion;
therefore, when combustible organic gas and air pass through the cold path of the first heat exchanger, the combustible organic gas and the air can be preheated by the flue gas which is output by the first heating pipe and has residual heat, and then enter the second combustor to participate in combustion; when the combustible organic gas and the air pass through the cold path of the second heat exchanger, the combustible organic gas and the air can be preheated by the flue gas which is output by the second heating pipe and still has residual heat, and then enter the first combustor to participate in combustion; therefore, the residual heat of the flue gas is effectively recycled, the energy utilization rate of the fuel gas is further improved, and the energy consumption for repairing the organic polluted soil is reduced;
in addition, the first burner and the second heat exchanger are arranged adjacent to each other, and the second burner and the first heat exchanger are arranged adjacent to each other, so that the first auxiliary fuel pipe and the second auxiliary fuel pipe are as short as possible, on one hand, the energy recovery rate of residual heat of flue gas can be improved, and on the other hand, the occupation of the internal space of the treated soil pile can be reduced.
Preferably: the first heating pipe and the second heating pipe are parallel to each other and are horizontally arranged; the high-efficiency energy-saving pile-building thermal desorption device is provided with a plurality of groups of heating loops, and all the first heating pipes and the second heating pipes are uniformly arranged in the treated soil pile, so that each part of the treated soil pile is at least within the heating range of one first heating pipe or one second heating pipe, and the repair efficiency of the organic contaminated soil is improved.
As a preferred embodiment of the present invention: the gas supply system comprises a gas supply source, the gas supply source supplies gas to the gas inlet of the first combustor or the gas inlet of the second combustor through an independent gas branch, and each gas branch is provided with an independent electromagnetic valve;
the high-efficiency energy-saving reactor thermal desorption device also comprises a controller, wherein temperature sensors are arranged on each first heating pipe and each second heating pipe, and the controller is electrically connected with the control end of each electromagnetic valve and the output end of each temperature sensor respectively;
the controller is preset with an upper limit temperature and a lower limit temperature, and when the temperature of the heating pipe detected by any one temperature sensor is higher than or equal to the upper limit temperature, the controller controls the corresponding electromagnetic valve to be closed so as to stop the corresponding first combustor or second combustor to work, so that the temperature of the corresponding first heating pipe or second heating pipe is reduced; when the temperature of the heating pipe detected by any one temperature sensor is below the lower limit temperature, the controller controls the corresponding electromagnetic valve to be opened, so that the corresponding first burner or second burner starts to work, and the temperature of the corresponding first heating pipe or second heating pipe is increased.
Therefore, the heating temperature of the soil pile to be treated is controlled by the first heating pipe and the second heating pipe through the automatic starting and stopping mode of the first burner and the second burner.
As a preferred embodiment of the present invention: the gas phase extraction system comprises a plurality of gas phase extraction pipes for extracting gas in soil, the gas phase extraction pipes are horizontally arranged in parallel and are uniformly distributed in the processed soil pile, each gas phase extraction pipe is connected with a plurality of gas phase extraction vertical pipes, the upper ends of the gas phase extraction vertical pipes extend out to the upper side of the processed soil pile, and the upper end ports of the gas phase extraction vertical pipes are connected with the inlet of the gas storage tank through a collecting pipe.
Preferably: the upper end of each gas phase extraction vertical pipe is provided with a valve and a gas sampling port.
Preferably: the soil moisture content of the soil pile to be treated is below 15%, and the surface of the soil pile to be treated is covered with an insulating layer and a sealing layer. Thus, the sealing layer is used for preventing the gas in the treated soil heap from leaking to the outside; in addition, the heat-insulating layer and the pipeline heat-insulating material wrapped outside the pipeline can further reduce the energy consumption for repairing the organic polluted soil.
Preferably: the soil heap to be processed is equipped with temperature detector and pressure transmitter, and the surface of soil heap to be processed is equipped with soil sampling mouth to monitor the state of soil heap to be processed.
Preferably: the high-efficiency energy-saving pile-building thermal desorption device further comprises a sewage treatment system, and a sewage outlet of the gas storage tank is communicated with the sewage treatment system.
Compared with the prior art, the invention has the following beneficial effects:
firstly, a first heating pipe through which high-temperature hot gas flows heats a processed soil pile at high temperature, then a gas-phase extraction system is used for extracting gas-phase organic pollutants desorbed from the processed soil pile by heating into a gas storage tank, and the gas-phase organic pollutants are separated into combustible organic gas and sewage by a gas-liquid separator so as to convey the combustible organic gas serving as auxiliary fuel through an air distribution pipeline and are combusted in a first combustor together with the gas supplied by a gas supply system to generate the high-temperature hot gas; therefore, the invention can carry out resource utilization on the extracted gas-phase organic pollutants while carrying out thermal desorption treatment on the organic pollutants on the treated soil pile to repair the organic polluted soil, reduces the consumption of fuel gas, reduces the conformity of tail gas purification treatment, and avoids the problems of resource waste and large waste gas treatment load caused by directly using the high-concentration gas-phase organic pollutants as waste gases.
Secondly, according to the invention, the gap is arranged on the first heating pipe and the binding wire is wound, so that when the air pressure in the first heating pipe is above the air pressure threshold value, the soil pile to be treated is directly heated by high-temperature hot air flowing out of the gap in addition to the heating in a heat conduction mode, therefore, the remediation efficiency of the organic polluted soil can be improved, the heat taken away by the discharged flue gas can be reduced, and the energy utilization efficiency in the heating process is improved.
Thirdly, the first heat exchanger, the second burner, the second heating pipe and the second heat exchanger are additionally arranged, so that when combustible organic gas and air pass through a cold path of the first heat exchanger, the combustible organic gas and the air can be preheated by smoke gas which is output by the first heating pipe and has residual heat, and then enter the second burner to participate in combustion; when the combustible organic gas and the air pass through the cold path of the second heat exchanger, the combustible organic gas and the air can be preheated by the flue gas which is output by the second heating pipe and still has residual heat, and then enter the first combustor to participate in combustion; therefore, the residual heat of the flue gas is effectively recycled, the energy utilization rate of the fuel gas is further improved, and the energy consumption for repairing the organic polluted soil is reduced;
in addition, the first burner and the second heat exchanger are arranged adjacent to each other, and the second burner and the first heat exchanger are arranged adjacent to each other, so that the first auxiliary fuel pipe and the second auxiliary fuel pipe are as short as possible, on one hand, the energy recovery rate of residual heat of flue gas can be improved, and on the other hand, the occupation of the internal space of the treated soil pile can be reduced.
Fourthly, the invention is provided with an electromagnetic valve, a controller and a temperature sensor, and realizes the heating temperature control of the first heating pipe and the second heating pipe on the soil pile to be processed by the automatic start-stop mode of the first burner and the second burner.
Drawings
The invention is described in further detail below with reference to the following figures and specific examples:
fig. 1 is a schematic elevation view of an efficient energy-saving reactor-building thermal desorption device of the invention;
FIG. 2 is a schematic plan view of the high-efficiency energy-saving reactor-building thermal desorption device of the invention;
fig. 3 is a schematic structural view of a heating pipe according to the present invention.
Detailed Description
The present invention will be described in detail with reference to the following embodiments and the accompanying drawings to help those skilled in the art to better understand the inventive concept of the present invention, but the scope of the claims of the present invention is not limited to the following embodiments, and all other embodiments obtained without inventive efforts by those skilled in the art will fall within the scope of the present invention without departing from the inventive concept of the present invention.
Example one
As shown in fig. 1 to 3, the invention discloses an efficient and energy-saving heap construction thermal desorption device for organic contaminated soil remediation, which comprises: the system comprises a fuel gas supply system 1, a heating loop 2, a gas phase extraction system 3 and a gas storage tank 4 provided with a gas-liquid separator;
the heating circuit 2 comprises a first burner 2-1 and a first heating pipe 2-2; the first heating pipe 2-2 is buried in a treated soil pile 5, the gas supply system 1 supplies gas to a gas inlet of a first combustor 2-1, an outlet of the first combustor 2-1 is connected with an inlet of the first heating pipe 2-2, and an outlet of the first heating pipe 2-2 is communicated with a tail gas treatment system 6; wherein, in case the heating circuit 2 is not provided with the first heat exchanger 2-3 according to the embodiments described below, the outlet of the first heating pipe 2-2 can be directly communicated with the exhaust gas treatment system 6 through a pipeline.
The gas phase extraction system 3 is used for extracting gas in the treated soil pile 5, an outlet of the gas phase extraction system 3 is connected with an inlet of the gas storage tank 4, a gas outlet of the gas storage tank 4 is communicated with a gas inlet of the first combustor 2-1 through a gas distribution pipeline 7, and the gas distribution pipeline 7 is provided with a gas extractor 8 and is communicated with a gas outlet of a blower 9; wherein, in the case that the heating circuit 2 is not provided with the first heat exchanger 2-3 of the following embodiment, the air outlet of the air storage tank 4 can be directly communicated with the air inlet of the first combustor 2-1 through an air distribution pipeline 7.
Therefore, the working principle of the high-efficiency energy-saving reactor-building thermal desorption device is as follows:
the fuel gas supplied by the fuel gas supply system 1 is combusted in the first combustor 2-1 to generate high-temperature hot gas, the high-temperature hot gas enters the first heating pipe 2-2 to heat the soil pile 5 to be treated in a heat conduction mode, so that organic pollutants are promoted to be desorbed from the soil pile 5 to be treated to become gas-phase organic pollutants; and the flue gas output from the outlet of the first heating pipe 2-2 is finally led to an exhaust gas treatment system 6 for exhaust gas purification treatment.
The gas-phase extraction system 3 extracts the gas-phase organic pollutants in the treated soil pile 5 in an extraction mode, and the gas-phase organic pollutants enter the gas storage tank 4 and are separated into combustible organic gas and sewage through a gas-liquid separator; and then the air extractor 8 pumps the combustible organic gas in the air storage tank 4 into the air distribution pipeline 7, the blower 9 pumps the outside air into the air distribution pipeline 7, the combustible organic gas and the air are mixed in the air distribution pipeline 7 according to a certain flow ratio and finally lead to the air inlet of the first combustor 2-1, so that: combustible organic gas is used as auxiliary fuel to be combusted with the fuel gas supplied by the fuel gas supply system 1 in the first combustor 2-1 to generate the high-temperature hot gas.
Therefore, the invention can carry out resource utilization on the extracted gas-phase organic pollutants while carrying out thermal desorption treatment on the treated soil pile 5 to repair the organic polluted soil, reduces the consumption of fuel gas, reduces the conformity of tail gas purification treatment, and avoids the problems of resource waste and large waste gas treatment load caused by directly using the high-concentration gas-phase organic pollutants as waste gases.
The above is a basic implementation manner of the first embodiment, and further optimization, improvement and limitation may be performed on the basis of the basic implementation manner:
preferably: referring to fig. 3, the first heating pipe 2-2 is provided with a plurality of slits 2-2a at intervals along a length direction thereof, and the first heating pipe 2-2 is wound with a binding wire 2-2-1 at each slit 2-2a such that: when the air pressure in the first heating pipe 2-2 is lower than a preset air pressure threshold value, the strapping line 2-2-1 closes the gap 2-2a to prevent soil from entering the first heating pipe 2-2 from the gap 2-2 a; when the air pressure in the first heating pipe 2-2 is above the air pressure threshold, the gap 2-2a is opened by the higher air pressure, and the high-temperature hot air in the first heating pipe 2-2 can flow out to the treated soil heap 5 through the gap 2-2 a. Wherein the width of the gap 2-2a is preferably 1mm, and the binding wire 2-2-1 is preferably a steel wire.
Therefore, when the air pressure in the first heating pipe 2-2 is lower than a preset air pressure threshold, high-temperature hot air enters the first heating pipe 2-2 and heats the soil heap 5 to be treated in a heat conduction mode; when the air pressure in the first heating pipe 2-2 is higher than the air pressure threshold, the processed soil pile 5 is directly heated by the high-temperature hot air flowing out from the gap 2-2a in addition to the heating by the heat conduction method; therefore, the remediation efficiency of the organic contaminated soil can be improved, the heat taken away by the discharged flue gas can be reduced, and the energy utilization efficiency in the heating process is improved.
Example two
On the basis of the first embodiment, the second embodiment also adopts the following preferred embodiments:
the heating loop 2 also comprises a first heat exchanger 2-3, a second combustor 2-4, a second heating pipe 2-5 and a second heat exchanger 2-6;
the outlet of the first heating pipe 2-2 passes through the first heat exchanger 2-3 and then is led to an exhaust gas treatment system 6, namely: an outlet of the first heating pipe 2-2 is connected with a hot path inlet of a first heat exchanger 2-3, and a hot path outlet of the first heat exchanger 2-3 is connected with the tail gas treatment system 6 through a tail gas pipeline 6-1; moreover, the air outlet of the air storage tank 4 is connected with the second heat exchanger 2-6 through an air distribution pipeline 7 and then is communicated with the air inlet of the first combustor 2-1, namely: the air distribution pipeline 7 is connected with a cold path inlet of the second heat exchanger 2-6, and a cold path outlet of the second heat exchanger 2-6 is connected with an air inlet of the first combustor 2-1 through a first auxiliary fuel pipe 2-7;
the second heating pipes 2-5 are buried in the treated soil pile 5, the gas supply system 1 supplies gas to gas inlets of the second combustors 2-4, outlets of the second combustors 2-4 are connected with inlets of the second heating pipes 2-5, outlets of the second heating pipes 2-5 are connected with heat path inlets of the second heat exchangers 2-6, and heat path outlets of the second heat exchangers 2-6 are connected with the tail gas treatment system 6 through tail gas pipelines 6-1; the air distribution pipeline 7 is connected with a cold path inlet of the first heat exchanger 2-3, and a cold path outlet of the first heat exchanger 2-3 is connected with an air inlet of the second combustor 2-4 through a second auxiliary fuel pipe 2-8;
and, the first burner 2-1 is disposed adjacent to the second heat exchanger 2-6, and the second burner 2-4 is disposed adjacent to the first heat exchanger 2-3, so that the first auxiliary fuel pipe 2-7 and the second auxiliary fuel pipe 2-8 are as short as possible.
Therefore, the flue gas output from the outlet of the first heating pipe 2-2 firstly passes through the thermal path of the first heat exchanger 2-3 and then is output to the tail gas treatment system 6 through the tail gas pipeline 6-1, and the flue gas output from the outlet of the second heating pipe 2-5 firstly passes through the thermal path of the second heat exchanger 2-6 and then is output to the tail gas treatment system 6 through the tail gas pipeline 6-1, so as to carry out tail gas purification treatment;
the combustible organic gas and the air mixed in the air distribution pipeline 7 are divided into two paths, one path of the combustible organic gas and the air enters the air inlet of the second combustor 2-4 through the cold path of the first heat exchanger 2-3 and then enters the air inlet of the second combustor 2-4 through the second auxiliary fuel pipe 2-8, and the other path of the combustible organic gas and the air enters the air inlet of the first combustor 2-1 through the cold path of the second heat exchanger 2-6 and then enters the air inlet of the first combustor 2-1 through the first auxiliary fuel pipe 2-7 to participate in combustion;
therefore, when the combustible organic gas and the air pass through the cold path of the first heat exchanger 2-3, the combustible organic gas and the air can be preheated by the flue gas which is output by the first heating pipe 2-2 and has residual heat, and then enter the second combustor 2-4 to participate in combustion; when the combustible organic gas and the air pass through the cold path of the second heat exchanger 2-6, the combustible organic gas and the air can be preheated by the flue gas which is output by the second heating pipe 2-5 and has residual heat, and then enter the first combustor 2-1 to participate in combustion; therefore, the residual heat of the flue gas is effectively recycled, the energy utilization rate of the fuel gas is further improved, and the energy consumption for repairing the organic polluted soil is reduced;
and, by arranging the first burner 2-1 adjacent to the second heat exchanger 2-6 and the second burner 2-4 adjacent to the first heat exchanger 2-3, the first auxiliary fuel pipe 2-7 and the second auxiliary fuel pipe 2-8 are made as short as possible, on the one hand, the energy recovery rate of the residual heat of the flue gas can be improved, and on the other hand, the occupation of the internal space of the treated soil pile 5 can be reduced.
The above is the basic implementation manner of the second embodiment, and further optimization, improvement and limitation can be made on the basis of the basic implementation manner:
preferably: the first heating pipe 2-2 and the second heating pipe 2-5 are parallel to each other and are horizontally arranged; the high-efficiency energy-saving pile-building thermal desorption device is provided with a plurality of groups of heating loops 2, and all the first heating pipes 2-2 and the second heating pipes 2-5 are uniformly arranged in the treated soil pile 5, so that each part of the treated soil pile 5 is at least within the heating range of one first heating pipe 2-2 or one second heating pipe 2-5, and the repair efficiency of the organic contaminated soil is improved.
EXAMPLE III
On the basis of the second embodiment, the third embodiment also adopts the following preferred embodiments:
the gas supply system 1 comprises a gas supply source 1-1, the gas supply source 1-1 supplies gas to the gas inlet of the first combustor 2-1 or the gas inlet of the second combustor 2-4 through an independent gas branch 1-2, and each gas branch 1-2 is provided with an independent electromagnetic valve 1-3;
the high-efficiency energy-saving reactor thermal desorption device also comprises a controller, wherein temperature sensors are arranged on each first heating pipe 2-2 and each second heating pipe 2-5, and the controller is electrically connected with the control end of each electromagnetic valve 1-3 and the output end of each temperature sensor respectively;
the controller is preset with an upper limit temperature and a lower limit temperature, and when the heating pipe temperature detected by any one temperature sensor is higher than or equal to the upper limit temperature, the controller controls the corresponding electromagnetic valve 1-3 to close, so that the corresponding first combustor 2-1 or second combustor 2-4 stops working, and the temperature of the corresponding first heating pipe 2-2 or second heating pipe 2-5 is reduced; when the heating pipe temperature detected by any one of the temperature sensors is below the lower limit temperature, the controller controls the corresponding solenoid valve 1-3 to open, so that the corresponding first burner 2-1 or second burner 2-4 starts to operate, thereby increasing the temperature of the corresponding first heating pipe 2-2 or second heating pipe 2-5.
Therefore, the heating temperature of the soil heap 5 to be treated is controlled by the first heating pipe 2-2 and the second heating pipe 2-5 through the automatic starting and stopping mode of the first combustor 2-1 and the second combustor 2-4.
Example four
On the basis of any one of the first to third embodiments, the fourth embodiment further adopts the following preferred embodiments:
the gas phase extraction system 3 comprises a plurality of gas phase extraction pipes 3-1 for extracting gas in soil, the gas phase extraction pipes 3-1 are arranged horizontally in parallel and are uniformly distributed in the treated soil pile 5, each gas phase extraction pipe 3-1 is connected with a plurality of gas phase extraction vertical pipes 3-2, the upper ends of the gas phase extraction vertical pipes 3-2 extend out to the upper side of the treated soil pile 5, and the upper end ports of the gas phase extraction vertical pipes 3-2 are connected with the inlet of the gas storage tank 4 through collecting pipes 3-3.
The above is the basic implementation of the fourth embodiment, and further optimization, improvement and limitation can be made on the basis of the basic implementation:
preferably: the upper end of each gas phase extraction vertical pipe 3-2 is provided with a valve and a gas sampling port.
EXAMPLE five
On the basis of any one of the first to fourth embodiments, the fifth embodiment further adopts the following preferred embodiments:
preferably: the soil moisture content of the soil heap 5 to be treated is below 15%, and the surface of the soil heap 5 to be treated is covered with an insulating layer and a sealing layer. Thereby, the gas inside the soil heap 5 to be treated is prevented from leaking to the outside by the sealing layer; in addition, the heat-insulating layer and the pipeline heat-insulating material wrapped outside the pipeline can further reduce the energy consumption for repairing the organic polluted soil.
Preferably: the soil heap 5 to be processed is provided with a temperature detector 10 and a pressure transmitter 11, and the surface of the soil heap 5 to be processed is provided with a soil sampling port to monitor the state of the soil heap 5 to be processed.
Preferably: the high-efficiency energy-saving heap-building thermal desorption device further comprises a sewage treatment system 12, and a sewage outlet of the gas storage tank 4 is communicated with the sewage treatment system 12.
The present invention is not limited to the above embodiments, and various other equivalent modifications, substitutions and alterations can be made without departing from the basic technical concept of the invention as described above, according to the common technical knowledge and conventional means in the field.
Claims (10)
1. The utility model provides a be used for prosthetic energy-efficient heap thermal desorption device of building of organic contaminated soil which characterized in that includes: the system comprises a fuel gas supply system (1), a heating loop (2), a vapor extraction system (3) and a gas storage tank (4) provided with a gas-liquid separator;
the heating circuit (2) comprises a first burner (2-1) and a first heating pipe (2-2); the first heating pipe (2-2) is buried in a treated soil pile (5), the gas supply system (1) supplies gas to a gas inlet of the first combustor (2-1), an outlet of the first combustor (2-1) is connected with an inlet of the first heating pipe (2-2), and an outlet of the first heating pipe (2-2) is communicated with a tail gas treatment system (6);
the gas extraction system (3) is used for extracting gas in the treated soil heap (5), an outlet of the gas extraction system (3) is connected with an inlet of the gas storage tank (4), a gas outlet of the gas storage tank (4) is communicated with a gas inlet of the first combustor (2-1) through a gas distribution pipeline (7), and the gas distribution pipeline (7) is provided with a gas extractor (8) and communicated with a gas outlet of a blower (9).
2. The efficient and energy-saving heap construction thermal desorption device for organic contaminated soil remediation according to claim 1, wherein: the first heating pipe (2-2) is provided with a plurality of gaps (2-2a) at intervals along the length direction, and a binding line (2-2-1) is wound on each gap (2-2a) of the first heating pipe (2-2) so that: the strapping line (2-2-1) closes the gap (2-2a) when the air pressure in the first heating tube (2-2) is below a preset air pressure threshold; when the air pressure in the first heating pipe (2-2) is above the air pressure threshold value, the high-temperature hot air in the first heating pipe (2-2) can flow out to the treated soil heap (5) through the gap (2-2 a).
3. The high-efficiency energy-saving heap-built thermal desorption device for organic contaminated soil remediation according to claim 1 or 2, wherein: the heating loop (2) further comprises a first heat exchanger (2-3), a second combustor (2-4), a second heating pipe (2-5) and a second heat exchanger (2-6);
the outlet of the first heating pipe (2-2) passes through the first heat exchanger (2-3) and then is led to an exhaust gas treatment system (6), namely: an outlet of the first heating pipe (2-2) is connected with a hot path inlet of a first heat exchanger (2-3), and a hot path outlet of the first heat exchanger (2-3) is connected with the tail gas treatment system (6) through a tail gas pipeline (6-1); moreover, the air outlet of the air storage tank (4) is connected with the second heat exchanger (2-6) through an air distribution pipeline (7) and then is communicated with the air inlet of the first combustor (2-1), namely: the air distribution pipeline (7) is connected with a cold path inlet of a second heat exchanger (2-6), and a cold path outlet of the second heat exchanger (2-6) is connected with an air inlet of a first combustor (2-1) through a first auxiliary fuel pipe (2-7);
the second heating pipe (2-5) is buried in the soil pile to be treated (5), the gas supply system (1) supplies gas to a gas inlet of a second combustor (2-4), an outlet of the second combustor (2-4) is connected with an inlet of the second heating pipe (2-5), an outlet of the second heating pipe (2-5) is connected with a hot path inlet of a second heat exchanger (2-6), and a hot path outlet of the second heat exchanger (2-6) is connected with the tail gas treatment system (6) through a tail gas pipeline (6-1); the air distribution pipeline (7) is connected with a cold path inlet of the first heat exchanger (2-3), and a cold path outlet of the first heat exchanger (2-3) is connected with an air inlet of the second combustor (2-4) through a second auxiliary fuel pipe (2-8);
and the first burner (2-1) is arranged adjacent to the second heat exchanger (2-6), and the second burner (2-4) is arranged adjacent to the first heat exchanger (2-3).
4. The efficient and energy-saving heap construction thermal desorption device for organic contaminated soil remediation according to claim 1, wherein: the first heating pipe (2-2) and the second heating pipe (2-5) are parallel to each other and are horizontally arranged; the high-efficiency energy-saving pile-building thermal desorption device is provided with a plurality of groups of heating loops (2), and all first heating pipes (2-2) and second heating pipes (2-5) are uniformly arranged in the treated soil pile (5), so that each part of the treated soil pile (5) is at least within the heating range of one first heating pipe (2-2) or one second heating pipe (2-5).
5. The efficient and energy-saving pile-building thermal desorption device for repairing the organic contaminated soil according to claim 3, which is characterized in that: the gas supply system (1) comprises a gas supply source (1-1), the gas supply source (1-1) supplies gas to the gas inlet of the first combustor (2-1) or the gas inlet of the second combustor (2-4) through an independent gas branch (1-2), and each gas branch (1-2) is provided with an independent electromagnetic valve (1-3);
the high-efficiency energy-saving reactor thermal desorption device further comprises a controller, temperature sensors are arranged on each first heating pipe (2-2) and each second heating pipe (2-5), and the controller is electrically connected with the control end of each electromagnetic valve (1-3) and the output end of each temperature sensor respectively;
the controller is preset with an upper limit temperature and a lower limit temperature, and controls the corresponding electromagnetic valve (1-3) to be closed when the heating pipe temperature detected by any one temperature sensor is higher than or equal to the upper limit temperature; when the temperature of the heating pipe detected by any one temperature sensor is below the lower limit temperature, the controller controls the corresponding electromagnetic valve (1-3) to be opened.
6. The high-efficiency energy-saving heap-built thermal desorption device for organic contaminated soil remediation according to claim 1 or 2, wherein: the gas phase extraction system (3) comprises a plurality of gas phase extraction pipes (3-1) for extracting gas in soil, the gas phase extraction pipes (3-1) are parallel to each other and are horizontally arranged and evenly distributed in the soil pile to be treated (5), each gas phase extraction pipe (3-1) is connected with a plurality of gas phase extraction vertical pipes (3-2), the upper ends of the gas phase extraction vertical pipes (3-2) extend out to the upper side of the soil pile to be treated (5), and the upper end ports of the gas phase extraction vertical pipes (3-2) are connected with the inlet of the gas storage tank (4) through confluence pipes (3-3).
7. The efficient and energy-saving heap construction thermal desorption device for organic contaminated soil remediation according to claim 6, wherein: the upper end of each gas phase extraction vertical pipe (3-2) is provided with a valve and a gas sampling port.
8. The high-efficiency energy-saving heap-built thermal desorption device for organic contaminated soil remediation according to claim 1 or 2, wherein: the soil moisture content of the soil pile (5) to be treated is below 15%, and the surface of the soil pile (5) to be treated is covered with an insulating layer and a sealing layer.
9. The high-efficiency energy-saving heap-built thermal desorption device for organic contaminated soil remediation according to claim 1 or 2, wherein: the processed soil pile (5) is provided with a temperature detector (10) and a pressure transmitter (11), and the surface of the processed soil pile (5) is provided with a soil sampling port.
10. The high-efficiency energy-saving heap-built thermal desorption device for organic contaminated soil remediation according to claim 1 or 2, wherein: the high-efficiency energy-saving heap-building thermal desorption device further comprises a sewage treatment system (12), and a sewage outlet of the gas storage tank (4) is communicated with the sewage treatment system (12).
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