CN111940481B - Pollution site normal position gas thermal desorption repair system - Google Patents
Pollution site normal position gas thermal desorption repair system Download PDFInfo
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- CN111940481B CN111940481B CN202010627460.2A CN202010627460A CN111940481B CN 111940481 B CN111940481 B CN 111940481B CN 202010627460 A CN202010627460 A CN 202010627460A CN 111940481 B CN111940481 B CN 111940481B
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- flue gas
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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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- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
Abstract
The invention discloses an in-situ gas thermal desorption restoration system for a polluted site, which comprises a burner, a heating well, an extraction well, a temperature data collection structure, a control system, a flue gas detection system and the like. The burner is connected with the heating well; the temperature data collection structure is used for arranging a plurality of temperature detection positions on the wall of the heating well and detecting the soil temperature near the heating well; the flue gas detection system is connected with the flue gas outlet of the heating well and is used for detecting flue gas components; sending the heating well flue gas and the extraction well extraction gas into a tail gas treatment unit for treatment; the control system is connected with the temperature data collection structure and the smoke detection system, and the air-fuel ratio of the burner is adjusted according to the temperature in the heating well pipe and smoke components. The automatic thermal desorption burner has the advantages of automatically adjusting the air-fuel ratio of the thermal desorption burner, being high in energy utilization efficiency, maintaining the temperature balance of the field and the like, and solves the problems of low energy utilization efficiency, weak temperature control effect and the like of the existing in-situ gas thermal desorption system.
Description
Technical Field
The invention relates to the technical field of soil remediation and discloses an in-situ gas thermal desorption remediation system for a polluted site.
Background
Organic pollution of field soil and groundwater is increasingly serious due to the exacerbation of industrial pollution and the wide application of agricultural chemicals. Typical organic contaminants in soil and groundwater include benzene series, organic halides, petroleum hydrocarbons, pesticides, polychlorinated biphenyls, and the like. The presence of these pollutants in soil and groundwater environments may have serious adverse effects on nearby human bodies and surrounding environments, so that these contaminated soil and groundwater must be remedied by reasonable technical means, thereby effectively controlling the human health and ecological environmental risks of the site.
The in-situ thermal desorption technology is an in-situ repair technology of an organic pollution site, which is used for heating an underground pollution area in situ, improving the temperature of soil and underground water, promoting the dissolution and volatilization of organic pollutants, collecting and capturing the organic pollutants and then purifying the organic pollutants. Has the outstanding advantages of wide application range, good repairing effect, high speed, controllable secondary pollution, and being applicable to deep repairing, etc. The heating mode of the technology mainly comprises resistance heating, steam/hot air direct injection heating and heat conduction heating, wherein the heat conduction heating can be divided into two modes of electric heating and gas heating. The fuel gas conduction heating technology takes natural gas or fuel oil as fuel to provide a heat source, heats a target treatment area through heat conduction, and simultaneously forms negative pressure extraction underground steam through power control. The method has the outstanding characteristics of strong applicability, short engineering period, clean energy source use and the like, has better market application prospect, and is a mainstream mode adopted in the in-situ heat removal technology.
However, the existing fuel gas heating mode has the defects of low energy utilization efficiency, weak temperature control effect and extensive operation control. In the repairing process, the system is not regulated according to the actual repairing condition, and the uncertainty of fuel gas, air flow and proportion thereof causes the fluctuation of the temperature of the flue gas or causes a large amount of heat loss of the system, which is not beneficial to the effect control of the repairing process, energy conservation and environmental protection.
Disclosure of Invention
The invention provides an in-situ gas thermal desorption repair system for a polluted site, aiming at the defect of low energy utilization efficiency of a burner of the existing in-situ thermal desorption equipment.
In order to solve the technical problems, the invention is solved by the following technical scheme: the in-situ gas thermal desorption restoration system for the polluted site comprises a burner and a heating well, wherein the burner is connected with the heating well and is arranged at the upper end of the heating well, and a mixing chamber is arranged above the burner; the method is characterized in that a plurality of temperature detection positions are arranged on the wall of the heating well, and the temperature detection positions are provided with a temperature data collection structure for detecting the soil temperature of the heating well; a smoke outlet is arranged above the heating well, and the smoke outlet is provided with a smoke detection system for detecting smoke components and concentration; the natural gas inlet of the mixing chamber is provided with the natural gas control valve, the air inlet is provided with the air control valve, the top of the mixing chamber is provided with the control system, the control system is connected with the temperature data collecting structure, the flue gas detection system and the air control valve, and the control system outputs signals to the natural gas control valve and the air control valve through a PID control algorithm according to the soil temperature monitoring value and the flue gas concentration of the flue gas outlet so as to regulate the natural gas flow and the air flow in the burner in real time.
Further, the temperature data collection structure adopts a thermocouple sensor to detect the soil temperature of the heating well, and the thermocouple sensor is a type-K thermocouple of NiCr-Ni type.
Further, the thermocouple sensor is arranged on the wall of the heating well at intervals of a certain distance, and the certain distance is 1.5-2.5 meters.
Further, the mixing chamber can strengthen turbulent mixing of air and natural gas, and energy utilization efficiency is improved.
Further, the flue gas detection system detects the oxygen content, the carbon monoxide content and the methane content in the flue gas, and the sensors for detecting the oxygen content in the flue gas detection system are zirconium oxide wide-threshold oxygen sensors and the sensors for detecting the carbon monoxide content and the methane content are nondestructive infrared analyzers.
Further, the temperature set values of the different depths of the heating well soil are determined according to the type and concentration of pollutants in the soil pollution, the soil remediation process and the environmental conditions.
Further, a plurality of heating wells are provided with an extraction well, a flue gas outlet of the heating wells is connected with an extraction well outlet and is connected to the tail gas treatment unit, and flue gas with reduced temperature after the soil is heated is extracted from the flue gas outlet connected with the heating wells and is sent to the tail gas treatment unit together with the extraction well extraction gas carrying pollutants for treatment.
The air-fuel ratio adjusting method of the pollution site in-situ gas thermal desorption repair system is characterized by comprising the following steps of:
A. real-time soil temperature T is detected by thermocouple sensors arranged at different depths tn The method comprises the steps of carrying out a first treatment on the surface of the Real-time oxygen concentration C in flue gas measured by flue gas detection system O2 Concentration of carbon monoxide C CO Concentration C of methane CH4 ；
B. The thermocouple sensors arranged at different depths of a certain heating well detect and obtain the real-time soil temperature T tn Setting value T of soil temperature at different depths in restoration scheme sn Comparing, and obtaining natural gas flow u at different depth positions of a certain heating well by conversion of the following formula n ，
Wherein: e, e n ＝T sn -T tn Namely, the deviation of the actual measured soil temperature and the set temperature of different depths of a certain heating well; k (K) Pn 、T In 、T Dn Respectively proportional gain, integral time constant and differential time constant of the PID controller, wherein tau is time, and n represents different depth positions of a heating well;
the natural gas flow at different depth positions of the heating well is obtained through conversion and is u respectively 1 、u 2 ···u n The natural gas flow value u of a certain heating well can be comprehensively calculated,
respectively showing the influence degree of soil temperatures at different depths in natural gas flow calculation;
C. according to the real-time oxygen concentration C in the flue gas obtained by the flue gas detection system O2 Concentration of carbon monoxide C CO Methane concentration C CH4 And the concentration set value C' O2 、C′ CO 、C′ CH4 Comparing, and respectively converting to obtain natural gas flow v under the influence of different component concentrations in the flue gas according to the following calculation formula n ，
Wherein s is 1 ＝C′ O2 -C O2 ，s 2 ＝C′ CO -C CO ，s 3 ＝C′ CH4 -C CH4 ，v 1 、v 2 、v 3 Natural gas flow under the influence of the concentration of three different components of oxygen, carbon monoxide and methane respectively;
the natural gas flow value v is obtained through comprehensive calculation, respectively representing the influence degree of different gases in the natural gas flow calculation;
D. synthesizing the calculated final natural gas flow value Q, q=au+bv, wherein a+b=1;
wherein: a. b represents the influence degree of soil temperature and smoke gas components in the natural gas flow calculation respectively;
E. adjusting the opening degree of the natural gas control valve according to the calculated final natural gas flow value Q;
F. k according to the desired air-fuel ratio of the burner q Calculating an air flow value Q from a final natural air flow value Q of the combustor k Based on the calculated air flow value Q k And adjusting the opening degree of the air control valve.
The invention realizes the automatic air-fuel ratio adjustment work, maintains the temperature balance of the field, and can improve the energy utilization efficiency.
Compared with the traditional in-situ thermal desorption system, the invention has the following advantages:
the invention achieves the purposes of automatically adjusting the air-fuel ratio, maintaining the temperature balance of the field and improving the energy utilization efficiency. The system has high automation degree, simultaneously fully considers the energy conservation and consumption reduction and the safety stability of system equipment, the heating temperature-flow regulating system compares the temperature measured by the thermocouple with the set temperature, and the temperature of the soil at a specific depth of a specific heating well is stabilized at the set temperature by changing the air flow and the natural gas flow, so that the oxygen content, the carbon monoxide content and the methane content in the flue gas are reduced, the natural gas is promoted to be completely combusted, and the energy utilization efficiency is improved.
Drawings
FIG. 1 is an in-situ gas thermal desorption remediation system for a contaminated site based on air-fuel ratio adjustment.
Description of the reference numerals
1-burner
2-heating well
3-temperature data collection structure
4-control system
5-flue gas detection system
6-natural gas control valve
7-air control valve
8-extraction well
9-flue gas outlet
10-tail gas treatment unit
11-mixing chamber
Detailed Description
The invention will be described in further detail with reference to fig. 1 and the examples:
as shown in the figure, the pollution site in-situ gas thermal desorption restoration system and the adjustment method based on air-fuel ratio adjustment disclosed by the embodiment comprise a burner 1, a heating well 2, an extraction well 8, a temperature data collection structure 3, a control system 4 and a smoke detection system 5, wherein a plurality of heating wells 2 are matched with one extraction well 8, the burner 1 is arranged at the upper end opening position of the heating well 2, and high-temperature smoke generated by the burner 1 enters the heating well 2 to heat soil.
Further preferably, the control system 4 is arranged at the top of the burner 1 and the mixing chamber 11, which is communicated with the air control valve 7 and the natural gas control valve 6, and the control system is respectively connected with the air control valve and the natural gas control valve in a control way. The natural gas control valve 6 and the air control valve 7 respectively regulate the natural gas flow and the air flow, the natural gas and the air are mixed in the mixing chamber 11, high-temperature flue gas is generated by combustion in the burner, and the high-temperature flue gas flows through the heating well to heat the soil through heat conduction.
The temperature data collection structure 3 adopts a thermocouple sensor to detect the soil temperature of the heating well 2.
The mixing chamber can strengthen turbulent mixing of air and natural gas, and improves energy utilization efficiency.
The flue gas detection system 5 detects the oxygen content, the carbon monoxide content and the methane content in the tail gas.
Further, the thermocouple sensor is a type-K thermocouple of NiCr-Ni type, and one thermocouple is arranged on each two meters of the wall of the heating well 2.
Further, the sensors for detecting the oxygen content in the tail gas in the flue gas detection system 5 are zirconia wide-threshold oxygen sensors, and the sensors for detecting the carbon monoxide content and the methane content are nondestructive infrared analyzers.
Further, the temperature value detected by the temperature data collecting structure 3 is transmitted to the control system 4, and can be controlled according to the deviation between the monitoring value of the outlet temperature of the heating well and the set value through a PID control algorithm, and control signals are output to the natural gas control valve 6 and the air control valve 7 so as to adjust the natural gas flow and the air flow in real time.
Further, the opening degree of each valve is adjusted by the natural gas control valve 6 and the air control valve 7 according to the control signal of the control system 4, so that the natural gas flow and the air flow are respectively adjusted, the optimal natural gas flow and the air-fuel ratio thereof in the heating process are ensured, the natural gas utilization rate is improved, and the natural gas consumption is reduced.
Further, the oxygen, carbon monoxide and natural gas content detected by the flue gas detection system 5 are transmitted to the control system, and can be controlled according to the deviation of each gas content monitoring value and a set value through a PID control algorithm, and control signals are output to the natural gas control valve 6 and the air control valve 7 so as to regulate the natural gas flow and the air flow in real time.
Further, in the flue gas detection system 5, the set value of the mass fraction of methane is 0.2% -0.4%, the set value of oxygen is 0.2% -0.8%, and the set value of carbon monoxide is 0.2% -0.3%.
Further, the temperature settings for different depths of the heating well 2 are determined according to the type and concentration of the pollutants for soil pollution, the soil remediation process and environmental conditions.
Further, detecting the real-time soil temperature T according to thermocouple sensors arranged at different depths of the heating well tn Setting value T of soil temperature at different depths in restoration scheme sn Comparing, and obtaining natural gas flow u at different depth positions of a certain heating well by conversion of the following formula n ，
Wherein: e, e n ＝T sn -T tn Namely, the deviation of the actual measured soil temperature and the set temperature of different depths of a certain heating well; k (K) Pn 、T In 、T Dn Respectively proportional gain, integral time constant and differential time constant of the PID controller, wherein tau is time, and n represents different depth positions of a heating well;
the natural gas flow at different depth positions of the heating well is obtained through conversion and is u respectively 1 、u 2 ···u n The natural gas flow value u of a certain heating well can be comprehensively calculated,
respectively showing the influence degree of soil temperatures at different depths in natural gas flow calculation;
real-time in the flue gas obtained according to the flue gas detection systemOxygen concentration C O2 Concentration of carbon monoxide C CO Concentration C of methane CH4 And the concentration set value C' O2 、C′ CO 、C′ CH4 Comparing, and respectively converting to obtain natural gas flow v under the influence of different component concentrations in the flue gas according to the following calculation formula n ，
Wherein s is 1 ＝C′ O2 -C O2 ，s 2 ＝C′ CO -C CO ，s 3 ＝C′ CH4 -C CH4 ，v 1 、v 2 、v 3 Natural gas flow under the influence of the concentration of three different components of oxygen, carbon monoxide and methane respectively;
the natural gas flow value v is obtained through comprehensive calculation, respectively representing the influence degree of different gases in the natural gas flow calculation;
the resulting calculated natural gas flow value Q, q=au+bv, where a+b=1,
wherein: a. b respectively represents the influence degree of soil temperature and smoke gas components in natural gas flow calculation, and can be selected from 0-1 according to parameters such as heating period and the like.
Further, the desired air-fuel ratio of the burner is K q The method comprises the steps of carrying out a first treatment on the surface of the Adjusting the opening degree of a natural gas control valve according to the final natural gas flow value Q calculated by the control system; calculating an air flow value Q based on Kq and a final natural air flow value Q of the burner k Based on the calculated air flow value Q k And adjusting the opening degree of the air control valve.
Further, the flue gas with reduced temperature after the soil is heated is extracted from a flue gas outlet 9 connected with the heating well, and is sent to a tail gas treatment unit 10 for treatment together with the extraction well extraction gas carrying pollutants.
Claims (6)
1. The in-situ gas thermal desorption restoration system for the polluted site comprises a burner and a heating well, wherein the burner is connected with the heating well, the burner is arranged at the upper end of the heating well, and a mixing chamber is arranged above the burner; the method is characterized in that a plurality of temperature detection positions are arranged on the wall of the heating well, and the temperature detection positions are provided with a temperature data collection structure for detecting the soil temperature of the heating well; a smoke outlet is arranged above the heating well, and the smoke outlet is provided with a smoke detection system for detecting smoke components and concentration; the natural gas inlet of the mixing chamber is provided with a natural gas control valve, the air inlet is provided with an air control valve, the top of the mixing chamber is provided with a control system, the control system is connected with the temperature data collection structure, the flue gas detection system and the air control valve, and the control system outputs signals to the natural gas control valve and the air control valve through a PID control algorithm according to the soil temperature monitoring value and the flue gas concentration of the flue gas outlet so as to regulate the natural gas flow and the air flow in the burner in real time; the adjusting method comprises the following steps:
A. real-time soil temperature T is detected by thermocouple sensors arranged at different depths tn The method comprises the steps of carrying out a first treatment on the surface of the Real-time oxygen concentration C in flue gas measured by flue gas detection system O2 Concentration of carbon monoxide C CO Concentration C of methane CH4 ；
B. Thermocouple sensors arranged at different depths of a certain heating well detect and obtain real-time soil temperature T tn Setting value T of soil temperature at different depths in restoration scheme sn Comparing, and obtaining natural gas flow u at different depth positions of a certain heating well by conversion of the following formula n ，
Wherein: e, e n ＝T sn -T tn Namely, the deviation of the actual measured soil temperature and the set temperature of different depths of a certain heating well; k (K) Pn 、T In 、T Dn Respectively proportional gain, integral time constant and differential time constant of the PID controller, wherein tau is time, and n represents different depth positions of a heating well;
the natural gas flow at different depth positions of the heating well is obtained through conversion and is u respectively 1 、u 2 ···u n The natural gas flow value u of a certain heating well can be comprehensively calculated,
respectively showing the influence degree of soil temperatures at different depths in natural gas flow calculation;
C. according to the real-time oxygen concentration C in the flue gas obtained by the flue gas detection system O2 Concentration of carbon monoxide C CO Methane concentration C CH4 And the concentration set value C' O2 、C′ CO 、C′ CH4 Comparing, and respectively converting to obtain natural gas flow v under the influence of different component concentrations in the flue gas according to the following calculation formula n ，
Wherein s is 1 ＝C′ O2 -C O2 ，s 2 ＝C′ CO -C CO ，s 3 ＝C′ CH4 -C CH4 ，v 1 、v 2 、v 3 Natural gas flow under the influence of the concentration of three different components of oxygen, carbon monoxide and methane respectively;
the natural gas flow value v is obtained through comprehensive calculation,respectively representing the influence degree of different gases in the natural gas flow calculation;
D. synthesizing the calculated final natural gas flow value Q, q=au+bv, wherein a+b=1;
wherein: a. b represents the influence degree of soil temperature and smoke gas components in the natural gas flow calculation respectively;
E. adjusting the opening degree of the natural gas control valve according to the calculated final natural gas flow value Q;
F. k according to the desired air-fuel ratio of the burner q Calculating an air flow value Q from a final natural air flow value Q of the combustor k Based on the calculated air flow value Q k And adjusting the opening degree of the air control valve.
2. The contaminated site in-situ gas thermal desorption remediation system of claim 1 wherein the temperature data collection structure employs thermocouple sensors to detect heating well soil temperature; the thermocouple sensor is a type-K thermocouple of NiCr-Ni type.
3. The in-situ gas thermal desorption restoration system for a contaminated site according to claim 2, wherein the thermocouple sensor is arranged on the wall of the heating well at intervals of 1.5-2.5 m.
4. The contaminated site in-situ gas thermal desorption repair system of claim 1, wherein the flue gas detection system detects the oxygen content, the carbon monoxide content and the methane content in the flue gas, wherein the mass fraction of methane is set to be 0.2% -0.4%, the oxygen is set to be 0.2% -0.8%, and the carbon monoxide is set to be 0.2% -0.3%.
5. The in-situ gas thermal desorption restoration system for a contaminated site according to claim 4, wherein the sensor for detecting the oxygen content in the flue gas detection system is a zirconium oxide wide-threshold oxygen sensor, and the sensor for detecting the carbon monoxide content and the methane content is a nondestructive infrared analyzer.
6. The in-situ gas thermal desorption restoration system for a contaminated site according to claim 1, wherein a plurality of heating wells are provided with an extraction well, a flue gas outlet of the heating well is connected with the extraction well outlet and is connected with the tail gas treatment unit, and flue gas with reduced temperature after heating soil is extracted from the flue gas outlet connected with the heating well and is sent to the tail gas treatment unit together with the extraction well extraction gas carrying pollutants for treatment.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4406347B2 (en) * | 2004-10-05 | 2010-01-27 | 株式会社東芝 | Pollutant decomposition device and soil contaminant treatment device |
| CN202082951U (en) * | 2011-05-06 | 2011-12-21 | 广东万方意高能源设备有限公司 | Air/fuel ratio full ratio adjustable burner |
| CN202281248U (en) * | 2011-10-21 | 2012-06-20 | 无锡市凯天环保科技有限公司 | Industrial boiler energy-saving combustion operation control device |
| CN105834205B (en) * | 2016-06-03 | 2019-01-29 | 上海格林曼环境技术有限公司 | Recovery technique and its device is desorbed in the electric heating of contaminated site original position |
| CN205673361U (en) * | 2016-06-03 | 2016-11-09 | 上海格林曼环境技术有限公司 | The confession electric control temperature adjusting means of contaminated site electrical heating desorption prosthetic device in situ |
| CN107152695B (en) * | 2017-05-23 | 2018-09-21 | 合肥瑞石测控工程技术有限公司 | Heating furnace visualization combustion control system and control method based on many reference amounts detection |
| CN208967838U (en) * | 2018-08-24 | 2019-06-11 | 深圳德尔科机电环保科技有限公司 | Air-fuel ratio regulation system based on frequency conversion fan |
| CN110586639B (en) * | 2019-10-14 | 2021-11-23 | 森特士兴集团股份有限公司 | Servo energy-saving control system of natural gas soil heating device and control method thereof |
| CN110586637A (en) * | 2019-10-14 | 2019-12-20 | 森特士兴集团股份有限公司 | Self-powered natural gas soil heating system |
| CN110586638A (en) * | 2019-10-14 | 2019-12-20 | 森特士兴集团股份有限公司 | Positive-pressure regenerative natural gas soil heating and repairing system and method thereof |
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