CN208508804U - The thermal desorption electric system of resistance heating original position - Google Patents

Abstract

It includes: three-phase half-controlled rectifier circuit, the first filter network, level-one inverter, high-frequency step-up transformer, uncontrollable rectifier circuit, the second filter network, second level inverter and third filter network that the utility model embodiment, which provides a kind of resistance heating original position thermal desorption electric system,；The input terminal of three-phase half-controlled rectifier circuit is connect with AC power source, and the three-phase half-controlled rectifier circuit, first filter network, the level-one inverter, the high-frequency step-up transformer, the uncontrollable rectifier circuit, second filter network, the second level inverter and the third filter network are sequentially connected；The output end of the third filter network is connect with heated well, and the heated well is along the soil that depth of soil direction is embedded in target area.Frequency is improved by high-frequency step-up transformer, the volume weight of transformer is significantly reduced, and then reduce the volume of entire supply unit, improves the power density of resistance heating original position thermal desorption electric system.

Description

The thermal desorption electric system of resistance heating original position

Technical field

The utility model embodiment is related to contaminated soil based technique for in-situ remediation field, more particularly, to resistance heating original Position thermal desorption electric system.

Background technique

Currently, thermal desorption (In situ thermal desorption, ISTD) technology in situ is mainly used in Polluted Soil The reparation of earth, principle be by direct or indirect heat exchange, by soil or underground water pollution medium and its contained pollution Object is heated to boiling point or more, to change the physico-chemical property of pollution medium and pollutant, passes through control electric system temperature and heating Time selectively promotes pollutant gasification volatilization, increases the concentration of pollutant in gas phase or liquid phase, improve liquid phase extraction or Gas phase extracts the removal rate to pollutant.Thermal desorption process can make the volatilization of the organic compound in soil and cracking etc. physico Learn variation.After pollutant is converted into gaseous state, mobility will be greatly improved, the gaseous products evaporated by collect and Purified treatment is carried out after capture.Relative to other showering technologies, thermal desorption technology in situ is at low cost, time-consuming is short, can Multiple pollutant is handled simultaneously, and there is stronger applicability to hyposmosis contaminated area and heterogeneity contaminated area, be applicable in soil environment The advantages that type is more, electric system is removable, the soil after reparation is recycling.

Thermal desorption technology in situ is particularly suitable for the soil region of heavily contaminated, including high concentration, nonaqueous phase, free and source The organic pollutant of head.Currently, the pollutant that thermal desorption technology in situ can be used for handling predominantly contains the volatile organic compound of chlorine Object (CVOCs), semi-volatile organic matter (SVOCs), petroleum hydrocarbon (TPH), polycyclic aromatic hydrocarbon (PAHs), Polychlorinated biphenyls (PCBs) And pesticide etc..Especially for this kind of chlorinated organics of PCBs, the processing mode of non-oxide burning can substantially reduce two evils English generates.

Thermal desorption processing in situ is mainly made of the part such as soil heating system and control system, and wherein heating system is main Including energizing and heating two parts, different heating methods, there is also larger differences for energy supplying system, according to heat transfer mode And the difference of energy conversion, In Situ Heating technology can be divided into 3 kinds, i.e., the injection of steam/heat air (Steam Air Injection, SAI) technology, heat transfer heat (Thermal Conductive Heating, TCH) technology, resistance heating (Electrical Resistance Heating, ERH) technology.Resistance heating method is usually that heating electrode is embedded in soil in the prior art Polluted area, be powered to heated well makes current flow through zone of saturation or unsaturation layer medium heats underground, The waste for promoting pollutant to volatilize, dissolve, decompose or be degraded by microorganisms, and being generated pollutant or degradation by extraction system Qualified discharge is carried out after extraction, to remove pollutant.

ERH electric system is converted to the adjustable three-phase of voltage and current by the original electric energy that power conversion inputs power network Alternating current is delivered to heating electrode, to realize the control of subsurface temperature.As the core cell of ERH, ERH electric system is at least needed Meet demand below:

In terms of use cost, ERH technology is continued for some time after needing underground to reach target temperature, is generally depended on The factors such as primary pollutant concentration, target pollutant concentration, porosity, level of ground water, percolation flow velocity and increment.It is general to continue Heating time is 2-12 months, and energy consumption is very big.Therefore electric system should also have higher energy conversion efficiency and power density. In addition to this, as field engineering equipment, electric system should also have the characteristics of lightweight, high power density, motor-driven to improve Property performance.

In terms of heating effect, since there are skin effects for resistance, so that current ERH technology makes soil carrying out heating to soil The longitudinal temperature of earth is unevenly distributed, and resistance heating efficiency is caused to decline, and aggravates energy loss.For this purpose, electric system also needs energy Enough guarantee that the longitudinal direction of underground current is uniformly distributed.

Traditional ERH electric system using multi-tap transformer or duplex frequency boostering transformer cooperation chopping depressuring by the way of into Row voltage is adjusted.But multi-tap transformer can only realize discrete pressure regulation, and the secondary side tap of replacement need to be powered off first every time, it cannot Realize electrification pressure regulation；Although duplex frequency boostering transformer can be realized electrification pressure regulation, but Industrial Frequency Transformer bulky.Moreover, two Person, which does not have, guarantees underground current longitudinally equally distributed ability.

Utility model content

In order to overcome the problems referred above or it at least is partially solved the above problem, the utility model embodiment provides a kind of electricity Thermal desorption electric system in situ is heated in resistance.

On the one hand, the utility model embodiment provides a kind of resistance heating original position thermal desorption electric system, comprising: energy supply Unit, the supply unit include three-phase half-controlled rectifier circuit, the first filter network, level-one inverter, high frequency boosting transformation Device, uncontrollable rectifier circuit, the second filter network, second level inverter and third filter network；

The input terminal of the three-phase half-controlled rectifier circuit is connect with AC power source, the three-phase half-controlled rectifier circuit, First filter network, the level-one inverter, the high-frequency step-up transformer, the uncontrollable rectifier circuit, described second Filter network, the second level inverter and the third filter network are sequentially connected；The output end of the third filter network with Heated well connection, the heated well is along the soil that depth of soil direction is embedded in target area；

The three-phase half-controlled rectifier circuit is used to the three-phase alternating current that the AC power source provides being converted to the first kind Direct current, first filter network are used to filter out the noise of the first kind direct current, and the level-one inverter will be for that will filter Except the first kind direct current after noise is converted to single-phase alternating current, the high-frequency step-up transformer is described single-phase for improving The frequency of alternating current and the voltage for improving the single-phase alternating current, the uncontrollable rectifier circuit are used for transformation that the high frequency boosts The single-phase alternating current of device output is converted to the second class direct current, and second filter network is straight for filtering out second class The noise of galvanic electricity, the second level inverter are used to filter out the second class direct current after noise and are converted to first object three-phase Alternating current, the changeable frequency of the first object three-phase alternating current；The third filter network is for changing the first object The waveform of three-phase alternating current, obtains the second target three-phase alternating current of sinusoidal waveform, and the second target three-phase alternating current is used for For heated well power supply.

Preferably, the level-one inverter is specially the inverter modulated based on pulse width, and the second level inverter is Inverter based on sinusoidal pulse width modulation or space vector pulse width modulation.

Preferably, resistance heating original position thermal desorption electric system further include: extraction tube；

One end of the extraction tube is arranged in the soil of the target area, and the other end and the purification of the extraction tube are set Standby connection；

The extraction tube is for exporting the gasification pollutant in the soil of the target area to the cleaning equipment.

Preferably, resistance heating original position thermal desorption electric system further include: step voltage detection device；

The soil surface of the target area, and the level with the heated well is arranged in the step voltage detection device Distance is pre-determined distance, for measuring the step voltage at the pre-determined distance.

Preferably, resistance heating original position thermal desorption electric system further include: one end setting of water injection pipe, the water injection pipe exists In the soil of the target area, the other end of the water injection pipe is connected to water source, close to the other end on the water injection pipe Position water injection valve is installed.

Preferably, resistance heating original position thermal desorption electric system further include: supply unit current detection means, supply unit Voltage check device and central processing unit；

The supply unit current detection means is connect with the output end of the third filter network, for measuring the confession The current value of energy unit output；The supply unit voltage check device is connect with the output end of the third filter network, is used In the voltage value for measuring the supply unit output；

The central processing unit is filled with the supply unit current detection means, the supply unit voltage detecting respectively Set, the level-one inverter is connected with the second level inverter, the central processing unit is used for according to the current value and described Voltage value adjusts the parameter of the level-one inverter and the parameter of the three-stage inverter, until supply unit output Performance number is identical as the power demand values in the soil of the target area.

Preferably, the central processing unit is also connect with the step voltage detection device, and the central processing unit is used for The step voltage obtained according to the step voltage detection device measurement by the resistance heating original position thermal desorption electric system with The AC power source disconnects.

Preferably, the water injection valve is electrically operated valve.

Preferably, resistance heating original position thermal desorption electric system further include: humidity sensor, humidity sensor setting In the soil of the target area, for measuring the soil moisture of the target area；

The central processing unit is connect with the humidity sensor, and the central processing unit is used for according to the soil moisture The water injection valve is controlled to open.

Preferably, resistance heating original position thermal desorption electric system further include: isolation drive device；

The isolation drive device is used to for the central processing unit and the supply unit being isolated.

Resistance heating original position thermal desorption electric system provided by the embodiment of the utility model, system includes: supply unit, is supplied Energy unit includes three-phase half-controlled rectifier circuit, the first filter network, level-one inverter, high-frequency step-up transformer, uncontrollable rectifier Circuit, the second filter network, second level inverter and third filter network；The input terminal and alternating current of three-phase half-controlled rectifier circuit Source connection, three-phase half-controlled rectifier circuit, the first filter network, level-one inverter, high-frequency step-up transformer, uncontrollable rectifier electricity Road, the second filter network, second level inverter and third filter network are sequentially connected；The output end and heated well of third filter network Connection, heated well is along the soil that depth of soil direction is embedded in target area.The resistance provided in the utility model embodiment Heating thermal desorption electric system in situ is actually a kind of system topological, due to the main boosting transformation of traditional ERH electric system Device is located at the input side of 380V power frequency three-phase electricity, but Industrial Frequency Transformer bulky, leads to that ERH electric system is top-heavy, sets It is standby too fat to move, it increases construction site and places difficulty, reduce mobility.Therefore in the utility model embodiment in network topology Provided with three-phase half-controlled rectifier circuit, the first filter network, level-one inverter, high-frequency step-up transformer, uncontrollable rectifier circuit, Second filter network, second level inverter and third filter network improve frequency by high-frequency step-up transformer, significantly reduce The volume weight of transformer, and then the volume of entire supply unit is reduced, improve resistance heating original position thermal desorption power train The power density of system.So the system topological in the utility model embodiment has the characteristics of lightweight, high power density.Together When, since there are second level inverters in system, the changeable frequency of the second target three-phase alternating current of supply unit output can be made, And then heated well can be may be implemented for heated well power supply by the second target three-phase alternating current and soil is evenly heated.

Detailed description of the invention

In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is Some embodiments of the utility model, for those of ordinary skill in the art, without creative efforts, It is also possible to obtain other drawings based on these drawings.

Fig. 1 is a kind of structural representation for resistance heating original position thermal desorption electric system that an embodiment of the present invention provides Figure；

Fig. 2 is that a kind of structure for resistance heating original position thermal desorption electric system that another embodiment of the utility model provides is shown It is intended to；

Fig. 3 is that a kind of structure for resistance heating original position thermal desorption electric system that another embodiment of the utility model provides is shown It is intended to.

Specific embodiment

It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.Based on the implementation in the utility model Example, every other embodiment obtained by those of ordinary skill in the art without making creative efforts belong to The range of the utility model protection.

In the description of the utility model embodiment, it should be noted that term " center ", "upper", "lower", " left side ", The orientation or positional relationship of the instructions such as " right side ", "vertical", "horizontal", "inner", "outside" is orientation based on the figure or position Relationship, be merely for convenience of description the utility model embodiment and simplify description, rather than the device of indication or suggestion meaning or Element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as implementing the utility model The limitation of example.In addition, term " first ", " second ", " third " are used for description purposes only, it is not understood to indicate or imply phase To importance.

In the description of the utility model embodiment, it should be noted that unless otherwise clearly defined and limited, term " installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be fixedly connected, may be a detachable connection or one Connect to body；It can be mechanical connection, be also possible to be electrically connected；It can be directly connected, it can also be indirect by intermediary It is connected, can be the connection inside two elements.For the ordinary skill in the art, on being understood with concrete condition State concrete meaning of the term in the utility model embodiment.

When carrying out voltage adjusting using multi-tap transformer due to traditional ERH electric system, discrete pressure regulation can only be realized, And the secondary side tap of replacement need to be powered off first every time, can not achieve electrification pressure regulation；Using duplex frequency boostering transformer cooperation chopping depressuring Although electrification pressure regulation, but Industrial Frequency Transformer bulky be can be realized when mode carries out voltage adjusting, and the two does not have Control the ability of underground current genesis analysis.So demand of the utility model based on ERH electric control system, for existing skill The drawbacks of art scheme, propose a kind of improved resistance heating original position thermal desorption electric control system, overall volume is small and energy Enough realize underground current longitudinally equally distributed ability.

As shown in Figure 1, an embodiment of the present invention provides a kind of resistance heating original position thermal desorption electric system, packet Include: supply unit 1, supply unit 1 include three-phase half-controlled rectifier circuit 11, the first filter network 12, level-one inverter 13, High-frequency step-up transformer 14, uncontrollable rectifier circuit 15, the second filter network 16, second level inverter 17 and third filter network 18.

The input terminal of three-phase half-controlled rectifier circuit 11 is connect with AC power source 2, three-phase half-controlled rectifier circuit 11, first Filter network 12, level-one inverter 13, high-frequency step-up transformer 14, uncontrollable rectifier circuit 15, the second filter network 16, second level are inverse Become device 17 and third filter network 18 is sequentially connected；The output end of third filter network 18 is connect with heated well 3, heated well 3 Along the soil that depth of soil direction is embedded in target area.

Three-phase half-controlled rectifier circuit 11 is used to the three-phase alternating current that AC power source 2 provides being converted to first kind direct current Electricity, the first filter network 12 are used to filter out the noise of first kind direct current, and level-one inverter 13 is used to filter out the after noise A kind of direct current is converted to single-phase alternating current, and high-frequency step-up transformer 14 is used to improve the frequency of single-phase alternating current and improves single-phase The voltage of alternating current, uncontrollable rectifier circuit 15 are used to the single-phase alternating current that high-frequency step-up transformer 14 exports being converted to the second class Direct current, the second filter network 16 are used to filter out the noise of the second class direct current, and second level inverter 17 will be for after filtering out noise The second class direct current be converted to first object three-phase alternating current, the changeable frequency of first object three-phase alternating current；Third filtering Network 18 obtains the second target three-phase alternating current of sinusoidal waveform for changing the waveform of first object three-phase alternating current, and second Target three-phase alternating current is used to power for heated well 3.

Specifically, the AC power source used in the utility model embodiment can be both also possible to using commercial power power supply Household electricity power supply, commercial power power supply can be specifically 380V with output voltage, three-phase alternating current of the frequency for 50Hz, family Electricity consumption power supply specifically can be power grid or power-frequency generation unit, the three-phase alternating current that output voltage 220V, frequency are 50Hz. Three-phase alternating current is by three electric currents that frequency is identical, voltage amplitude is equal, the alternating current circuit of phase difference difference hexagonal angle exports. Three-phase alternating current is input in three-phase half-controlled rectifier circuit 11 through the input terminal of three-phase half-controlled rectifier circuit 11, through three-phase half Control rectifier circuit 11 is converted to direct current after rectifying, here in order to which the direct current exported with uncontrollable rectifier circuit 15 carries out area Point, the direct current being converted to after the rectification of three-phase half-controlled rectifier circuit 11 is denoted as first kind direct current.Three-phase half-controlled is whole Flowing bridge circuit is the circuit for three-phase alternating current being converted to direct current, and specially integrated half control rectification module, main includes three Thyristor and three Power Diode Pumpeds.The effect of uncontrollable rectifier circuit 15 is also by three-phase alternating current in the utility model embodiment The circuit of direct current is converted to, the structure of uncontrollable rectifier circuit 15 mainly includes 8 Power Diode Pumpeds, 8 Power Diode Pumped shapes At two-way DC circuit, two-way DC circuit is connected into DC circuit output all the way.

First kind DC supply input is filtered by the first filter network 12 into the first filter network 12, filters out first The noise being mingled in class direct current, then by the first kind DC supply input to level-one inverter 13 for filtering out noise, by level-one First kind direct current after filtering out noise is converted to single-phase alternating current by inverter 13, what needs to be explained here is that, level-one inversion Device 13 is the inverter of Parameter adjustable, can also carry out the adjusting of 13 output voltage of level-one inverter, by adjustment parameter with reality Now a wide range of linear voltage regulation.Parameter in level-one inverter 13 includes duty ratio, can be adjusted by the size of change duty ratio The voltage for the single-phase alternating current that level-one inverter 13 exports.When level-one inverter 13 adjusts voltage, due to the value model of duty ratio It encloses for 0-1, then the effect of level-one inverter 13 is actually and realizes to adjust voltage, i.e. level-one inverter 13 on the basis of decompression The voltage variable of the single-phase alternating current of output and it is less than and filters out the voltage of the first kind direct current after noise.

The single-phase alternating current that level-one inverter 13 exports is input to high-frequency step-up transformer 14, and high-frequency step-up transformer 14 mentions The frequency of high single-phase alternating current and the voltage for improving single-phase alternating current, that is to say, that exported by high-frequency step-up transformer 14 single-phase Alternating current is high frequency single-phase alternating current.The high-frequency step-up transformer 14 selected in the utility model embodiment can be by single phase ac The frequency of electricity is improved to 10kHz.It is whole in order to reduce that the purpose of the frequency of single-phase alternating current is improved in the utility model embodiment The volume of a supply unit, and then reduce the volume of entire electric system, this is because traditional resistance heating original position thermal desorption In electric system, usually directly three-phase alternating current is input in adjustable transformer and adjusts output voltage, while guaranteeing Gao Gong Rate output thinks that heated well is powered.It is 50Hz since the frequency of three-phase alternating current is lower, and adjustable transformer is in three-phase alternating current Frequency it is lower when realize voltage regulation function and high-power output function, then need adjustable transformer that there is very big volume, example Such as, output power 100kW then needs the volume of adjustable transformer to reach the size of half of container, not only increases land occupation Area is not easy to move, and also adds cost.So high frequency liter is added in the utility model embodiment in supply unit Pressure transformer improves the frequency of single-phase alternating current, since high-frequency step-up transformer very little can reduce the body of entire supply unit in turn Product.

What needs to be explained here is that since level-one inverter 13 has the function of decompression, the ratio and level-one inversion of decompression The duty ratio of device 13 is related.So the single-phase alternating current after 14 pairs of high-frequency step-up transformer decompressions is also needed to boost, so that The voltage of the target three-phase alternating current finally exported from supply unit is adjustable within the scope of 0-200V.In the utility model embodiment Using the high-frequency step-up transformer 14 that step-up ratio is fixed, preferably, the value range of step-up ratio can be 1:2 to 1:5, It is not specifically limited in this embodiment in the utility model embodiment.Due to the second target three-phase alternating current finally exported from supply unit Voltage it is adjustable within the scope of 0-200V, then finally from supply unit export the second target three-phase alternating current electric current be also can It adjusts

The single-phase alternating current that high-frequency step-up transformer 14 exports is input in uncontrollable rectifier circuit 15, by uncontrollable rectifier circuit The single-phase alternating current that high-frequency step-up transformer 14 exports is converted to the second class direct current by 15.Second class DC supply input is to second In filter network 16, what needs to be explained here is that, the second filter network 16 is identical as 12 structure of the first filter network, acts on also phase Together, be noise for filtering out direct current, unlike the first filter network 12 filter out be first kind direct current noise, The noise of the direct current exported by three-phase half-controlled rectifier circuit 11, what the second filter network 16 filtered out is the second class direct current Noise, i.e., the noise of the direct current exported by uncontrollable rectifier circuit 15.First filter network 12 and the second filter network 16 are It can be equivalent to low-pass filter, realize low-pass filtering.

The second class DC supply input of noise is filtered out into second level inverter 17 through the second filter network 16, it is inverse through second level Become after device 17 and the second class direct current for filtering out noise is converted into first object three-phase alternating current, the effect of second level inverter 17 is Fixed the second class direct current for filtering out noise of frequency is converted to the first object three-phase alternating current of changeable frequency.First object The frequency variation pattern of three-phase alternating current is frequency sweep, i.e., takes each frequency values in 40-60Hz repeatedly.

The first object three-phase alternating current exported through second level inverter 17 is input to third filter network 18, changes first The waveform of target three-phase alternating current, obtains the second target three-phase alternating current of sinusoidal waveform, and the second target three-phase alternating current is used for For the power supply of heated well 3.

What needs to be explained here is that since there are the first filter networks and the second filter network in supply unit, so that through The waveform for crossing the first object single-phase alternating current obtained after second level inverter 17 is square wave, this waveform and it is not applicable with for heating Well 3 provides electric energy, so third filter network 18 is provided in the utility model embodiment, by first object three-phase alternating current Waveform becomes sine wave from square wave, obtains the second target three-phase alternating current in sinusoidal waveform that can be powered for heated well 3.The Three filter networks 18 can be equivalent to the low-pass filter that cutoff frequency is 100Hz, realize low-pass filtering.

Heated well 3 is along the soil that depth of soil direction is embedded in target area, and heated well 3 is for the soil for target area Earth is heated, and so that the pollutant in soil is gasified and is discharged, and has the function that remove pollutant cleaning soil, goal area Domain refers to the region for needing to remove pollutant.

Since there are skin effects for electric current, temperature of the heated well in certain soil at a certain constant depth can be made higher, And the temperature in other depths is lower, causes heated well to heat soil uneven.Due to constant depth and it is applied to heating The frequency of the second target three-phase alternating current on well is related, so passing through second level inverter in the utility model embodiment for second Class direct current is converted to the first object three-phase alternating current of changeable frequency, then obtains the through third filter network adjustment waveform again Two target three-phase alternating currents are that heated well may be implemented to the uniform of soil in heated well power supply by the second target three-phase alternating current Heating.

A kind of resistance heating original position thermal desorption electric system provided in the utility model embodiment, comprising: supply unit, Supply unit include: three-phase half-controlled rectifier circuit, the first filter network, level-one inverter, high-frequency step-up transformer, do not control it is whole Current circuit, the second filter network, second level inverter and third filter network；The input terminal of the three-phase half-controlled rectifier circuit with AC power source connection, the three-phase half-controlled rectifier circuit, first filter network, the level-one inverter, the high frequency Step-up transformer, the uncontrollable rectifier circuit, second filter network, the second level inverter and the third filter network It is sequentially connected；The output end of the third filter network is connect with heated well, and the heated well is embedded in along depth of soil direction In the soil of target area.The resistance heating original position thermal desorption electric system provided in the utility model embodiment is actually one Kind system topological, since the main step-up transformer of traditional ERH electric system is located at the input side of 380V power frequency three-phase electricity, but work Frequency power transformer bulky, leads to that ERH electric system is top-heavy, equipment is too fat to move, increases construction site and places difficulty, drop Low mobility.Therefore three-phase half-controlled rectifier circuit, the first filter are provided in the utility model embodiment in network topology Wave network, level-one inverter, high-frequency step-up transformer, uncontrollable rectifier circuit, the second filter network, second level inverter and third filter Wave network improves frequency by high-frequency step-up transformer, significantly reduces the volume weight of transformer, and then reduces entire The volume of supply unit improves the power density of resistance heating original position thermal desorption electric system.So the utility model is implemented System topological in example has the characteristics of lightweight, high power density.It, can be with simultaneously as there are second level inverter in system The changeable frequency for the second target three-phase alternating current for exporting supply unit, and then can be by the second target three-phase alternating current Heated well power supply may be implemented heated well and be evenly heated to soil.

Resistance heating original position thermal desorption electric system provided by the embodiment of the utility model uses the straight rectification circuit of double cross (i.e. Three-phase half-controlled rectifier circuit and uncontrollable rectifier circuit)+two-stage three-phase inversion topological circuit (i.e. level-one inverter and second level inversion Device), which has front and back stages inverter, and level-one inverter is responsible for realizing that a wide range of linear voltage regulation, second level inverter are responsible for Realize frequency conversion output, the division of labor of two-stage inverter is clear, and Each performs its own functions, while using HF switch (i.e. high-frequency step-up transformer) Using the volume weight that system can be greatly reduced, the power density of system is improved.

On the basis of the above embodiments, the level-one inverter and second level inverter used in the utility model embodiment is equal For the inverter for modulating (Pulse Width Modulation, PWM) based on pulse width, wherein level-one inverter is using shifting Phase control and the mode of auxiliary bridge arm realize Sofe Switch.Level-one inverter and second level inverter based on PWM can be realized big model Enclose linear voltage regulation.

On the basis of the above embodiments, the resistance heating original position thermal desorption power train provided in the utility model embodiment It further include contactor in system, contactor is used to control the connecting and disconnecting of electric system and AC power source.

As shown in Fig. 2, AC power source 2 is generating set or power grid, the three-phase alternating current of generation has A, B and C three-phase, Pass through contactor 4, the three-phase half-controlled rectifier circuit 11 in supply unit 1, the first filter network 12, level-one inverter respectively 13, high-frequency step-up transformer 14, uncontrollable rectifier circuit 15, the second filter network 16, second level inverter 17 and third filter network Be converted to the second target three-phase alternating current after 18, the second target three-phase alternating current tool there are three power stage, respectively power stage U, Power stage V and power stage W respectively corresponds the phase in target three-phase alternating current three-phase.Power stage U, power stage V and power stage W It is connect respectively with a heated well, wherein the heated well 31 in the soil of target area is arranged in the power stage U heated well connecting It is interior, it is arranged in the heated well 32 in the soil of target area with the power stage V heated well connecting, what is connect with power stage W adds Hot well is arranged in the heated well 33 in the soil of target area.

On the basis of the above embodiments, as shown in Fig. 2, the thermal desorption electric system of resistance heating original position further include: extracting Pipe；One end of extraction tube is arranged in the extraction well 8 in the soil of target area, and the other end and cleaning equipment 9 of extraction tube connect It connects；Extraction tube is for exporting the gasification pollutant in the soil of target area to cleaning equipment 9.Pass through 9 pairs of gas of cleaning equipment Change pollutant to be converted or eliminated, prevents gasification pollutant to be directly entered atmosphere and cause secondary pollution.

On the basis of the above embodiments, resistance heating original position thermal desorption electric system further include: step voltage detection dress It sets；

It is pre- that step voltage detection device, which is arranged in the corresponding soil surface in target area, and with the horizontal distance of heated well, If distance, for measuring the step voltage at pre-determined distance.

Specifically, as shown in Fig. 2, flow of personnel is intensive since the construction area of ERH electric system is big, and ERH power train System needs to insert electrodes into underground at work, passes to low-voltage, high-current, soil is heated fever as conducting medium.At this In the process, soil inevitably charges, if equipment is at work, someone or animal are strayed into working region, it is possible to meeting It gets an electric shock since step voltage is excessive.Compared to traditional ERH electric system, the utility model embodiment joined in systems Step voltage detection device 10；Step voltage detection device 10 is arranged in the corresponding soil surface in target area, and and heated well Horizontal distance be pre-determined distance, for measuring the step voltage at pre-determined distance.Step voltage is also added into simultaneity factor Protect circuit, be provided with default step voltage in step voltage protection circuit, when the obtained step voltage of measurement lower than it is default across Illustrate to be safe when people is in system when walking voltage, the explanation when the step voltage that measurement obtains is higher than default step voltage People be when being in system it is dangerous, emergency shutdown is improved construction safety coefficient by system at this time.Default step voltage can be with It is set as needed, the value that step voltage is preset in the utility model embodiment meets following formula:

Es=50+0.2 ρ

Wherein, ρ is local soil resistivity, and unit is Ω m, i.e., the default step voltage of each department takes in target area Value may be different.

On the basis of the above embodiments, resistance heating original position thermal desorption electric system, which is characterized in that further include: note Water pipe, one end of the water injection pipe are arranged in the soil of the target area, and the other end of the water injection pipe is connected to water source, Position on the water injection pipe close to the other end is equipped with water injection valve.

Specifically, since resistivity of media is the most important factor for influencing ERH system treatment effect, if ERH system It is mounted in level of ground water or more or low-permeability soil, needs water being injected into heated well by injector well during heating attached In close soil, to prevent the soil for adjoining heated well to be oven-dried.Therefore, add in the power system in the utility model embodiment Enter water injection pipe.

As shown in Fig. 2, one end of water injection pipe 5 is specifically water injection pipe in the injector well 7 being arranged in the soil of target area 5 other end is connected to water source, and the position on water injection pipe 5 close to water source is additionally provided with water injection valve 51.Water injection valve 51 is used for It is opened when humidity is lower in the soil of target area, by water injection pipe 5 to the soil injection water flow of target area, to guarantee target The soil in region has enough humidity.It should be noted that water injection valve 51 is not constantly to open, only when needed It opens, that is to say, that just need to open water injection valve 51 when the humidity only in the soil of target area is lower, to prevent soil It is oven-dried.

On the basis of the above embodiments, resistance heating original position thermal desorption electric system, further includes: supply unit electric current inspection Survey device, supply unit voltage check device and central processing unit；

The supply unit current detection means is connect with the output end of the third filter network, for measuring the confession The current value of energy unit output；The supply unit voltage check device is connect with the output end of the third filter network, is used In the voltage value for measuring the supply unit output；

The central processing unit is filled with the supply unit current detection means, the supply unit voltage detecting respectively Set, the level-one inverter is connected with the second level inverter, the central processing unit is used for according to the current value and described Voltage value adjusts the parameter of the level-one inverter and the parameter of the second level inverter, until supply unit output Performance number is identical as the power demand values in the soil of the target area.

Specifically, traditional ERH electric system underground is electrical as the increase of heating time will appear variation, makes At the fluctuation of load.Therefore traditional ERH electric system needs manual calibration at regular intervals.In the utility model embodiment Supply unit current detection means, supply unit voltage check device and central processing unit are introduced in the power system.In Central processor dynamically adjusts the parameter of level-one inverter and the parameter of second level inverter according to voltage value and current value, makes to energize The performance number of unit output is identical as the power demand values in the soil of target area.

Voltage, current double closed-loop electric system are used in the utility model embodiment, it can be in the case where the fluctuation of load It realizes constant power output, in the process due to introducing central processing unit, does not need manually to participate in, increase the flexible of system Property, while drain on manpower and material resources is reduced, and the degree of regulation of entire electric system can be increased.

As shown in figure 3, the thermal desorption electric system of resistance heating original position further include: supply unit current detection means 20 supplies It can cell voltage detection device 21 and central processing unit 22.The output of supply unit current detection means 20 and third filter network End connection, for measuring the current value of supply unit output；Supply unit voltage check device 21 is defeated with third filter network Outlet connection, for measuring the voltage value of supply unit output.

Central processing unit 22 respectively with supply unit current detection means 20, supply unit voltage check device 21, level-one Inverter is connected with second level inverter, and central processing unit 22 is used to measure obtained electricity according to supply unit current detection means 20 Flow valuve and supply unit voltage check device 21 measure obtained voltage value, adjust the parameter and second level inversion of level-one inverter The parameter of device, up to the power demand values in the identical and soil with target area of the performance number of supply unit output are identical.When Supply unit current detection means 20 measures obtained current value and is greater than the second pre-set current value and/or the inspection of supply unit voltage When survey device 21 measures obtained voltage value greater than the second preset voltage value, such as when appearance output terminal shortcircuit, current value can dash forward Infinity is increased to, voltage value meeting anticlimax to zero, then the output of level-one inverter and second level inverter is closed in central processing unit control, Achieve the purpose that protect electric system.The parameter of level-one inverter includes duty ratio, by the duty ratio for adjusting level-one inverter It can control the output power of level-one inverter；The parameter of second level inverter includes duty ratio, by adjusting second level inverter Duty ratio can control the output frequency of second level inverter.

It should be noted that realizing this reality using central processing unit well known in the prior art in the utility model embodiment With the processing and control function in new embodiment.It can be realized the center handled in the utility model embodiment with control function There are many processors, only with the digital signal processor and controller of model TMS320F28335 in the utility model embodiment For (Digital Signal Processing, DSP), but and does not have to this and used in the utility model embodiment to limit The concrete model of central processing unit.

On the basis of the above embodiments, central processing unit 22 is also protected with step voltage detection device 10 and step voltage Protection circuit connection, central processing unit 22 obtain step voltage detection device 10 and measure obtained step voltage, and measurement is obtained The default step voltage being arranged in step voltage and step voltage protection circuit is compared, and central processing unit 22 is according to the electricity that strides Pressure detection device 10 measures obtained step voltage and determines whether the thermal desorption electric system of resistance heating original position and AC power source It disconnects.Be when illustrating that people is in system when the obtained step voltage of measurement is lower than default step voltage it is safe, at this time in Central processor does not operate.It is danger when illustrating that people is in system when the step voltage that measurement obtains is higher than default step voltage Danger, the connection of central processing unit control at this time step voltage protection circuitry cuts system and AC power source stops system emergency Machine improves construction safety coefficient.

On the basis of the above embodiments, central processing unit 22 also with host computer 23 communicate to connect, central processing unit 22 with It can specifically be realized and be communicated to connect by WIFI module 24 between host computer 23, the data real-time delivery that central processing unit 22 is obtained It to host computer 23, stores host computer 23 to data, while real time data and historical data is patterned display. In addition, host computer 23 can also according to the soil resistivity ρ of the different location in target area it is personalized be stored with it is default across Voltage is walked, effective protection enters the personnel safety in target area.

The utility model is monitored system using wireless host computer, carries out clock time service using GPS, host computer has The graphic software platform function of real time data and historical data increases the safety coefficient and convenience of system；In addition to this, temperature rise Information and power information are of great significance for subsequent engineering optimization as important initial data.

On the basis of the above embodiments, due to the operating voltage very little of central processing unit 22, usually several volts, and energize The operating voltage of unit is usually 380V or 220V or so, and the two differs greatly, in order to realize that central processing unit 22 is inverse to level-one Become the adjustment effect of device and second level inverter, is gone back between central processing unit 22 and level-one inverter in the utility model embodiment It is provided with isolation drive device, isolation drive device is again provided between central processing unit 22 and second level inverter, is isolated Driving device is used to for central processing unit and supply unit being isolated, i.e., separates low-pressure area and higher-pressure region, prevent from influencing each other, real Now work independently.

On the basis of the above embodiments, the water injection valve in the electric system of resistance heating original position thermal desorption is electrically operated valve, Electrically operated valve can be controlled by central processing unit and be opened and closed, and realized and automatically controlled.

On the basis of the above embodiments, resistance heating original position thermal desorption electric system further include: humidity sensor, described Humidity sensor is arranged in the soil of the target area, for measuring the soil moisture of the target area；

The central processing unit is connect with the humidity sensor, and the central processing unit is used for according to the soil moisture The water injection valve is controlled to open.When soil moisture is higher than the first preset value, soil is moister at this time for explanation, is unfavorable for heated well Heating, so the water injection valve of central processing unit control at this time is closed, when soil moisture is lower than the second preset value, explanation is native at this time Earth drying requires supplementation with moisture content, so the water injection valve of central processing unit control at this time is opened.

Humidity sensor measurement soil moisture is utilized in the utility model embodiment, and is controlled whether out by central processing unit Open water injection valve, form humidity closed loop, guarantee soil moisture in a reasonable range, it is unlikely because moisture evaporation excessively causes Antecedent soil moisture or because moisture supplement excessively causes soil moisture muddy, is not easy to heat.

The safety of ERH Operation of Electric Systems is particularly important, climate reasons (temperature caused by Changes in weather and seasonal variations Variation) large effect can be generated to soil resistivity, to directly influence the output electricity of supply unit in ERH electric system The variation of stream, output voltage.Therefore central processing unit 22 is connect with contactor 4 in the utility model embodiment, as shown in figure 3, It is greater than the first pre-set current value and/or supply unit voltage when supply unit current detection means 20 measures obtained current value Detection device 21 measures obtained voltage value and is greater than the first preset voltage value, then the control of central processing unit 22 adjustment stage transformer Duty ratio realize parameter adjustment, by current value adjustment to less than the first pre-set current value, and/or by voltage value adjustment to less than First preset voltage value, when supply unit current detection means 20 measure obtained current value be greater than the second pre-set current value and/ Or supply unit voltage check device 21 measures obtained voltage value and is greater than the second preset voltage value, then central processing unit 22 controls Contactor 4 disconnects, and stopping AC power source is that supply unit is powered, to avoid under extreme case because of equipment caused by over-voltage and over-current Damage.Wherein, the first pre-set current value is less than the second pre-set current value, and the first preset voltage value is less than the second preset voltage value. That is, can realize tune when current value or voltage value deviate in a certain range by adjusting the duty ratio of level-one inverter Section then triggers contactor disconnection, and close the output of level-one inverter and second level inverter when being greater than this range.

The apparatus embodiments described above are merely exemplary, wherein described, unit can as illustrated by the separation member It is physically separated with being or may not be, component shown as a unit may or may not be physics list Member, it can it is in one place, or may be distributed over multiple network units.It can be selected according to the actual needs In some or all of the modules achieve the purpose of the solution of this embodiment.Those of ordinary skill in the art are not paying creativeness Labour in the case where, it can understand and implement.

Through the above description of the embodiments, those skilled in the art can be understood that each embodiment can It realizes by means of software and necessary general hardware platform, naturally it is also possible to pass through hardware.Based on this understanding, on Stating technical solution, substantially the part that contributes to existing technology can be embodied in the form of software products in other words, should Computer software product may be stored in a computer readable storage medium, such as ROM/RAM, magnetic disk, CD, including several fingers It enables and using so that a computer equipment (can be personal computer, server or the network equipment etc.) executes each implementation Method described in certain parts of example or embodiment.

Finally, it should be noted that above embodiments are only to illustrate the technical solution of the utility model, rather than its limitations； Although the utility model is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or part of technical characteristic is carried out etc. With replacement；And these are modified or replaceed, various embodiments of the utility model technology that it does not separate the essence of the corresponding technical solution The spirit and scope of scheme.

Claims (10)

1. a kind of resistance heating original position thermal desorption electric system characterized by comprising supply unit, the supply unit packet Include three-phase half-controlled rectifier circuit, the first filter network, level-one inverter, high-frequency step-up transformer, uncontrollable rectifier circuit, second Filter network, second level inverter and third filter network；

The input terminal of the three-phase half-controlled rectifier circuit is connect with AC power source, the three-phase half-controlled rectifier circuit, described First filter network, the level-one inverter, the high-frequency step-up transformer, the uncontrollable rectifier circuit, second filtering Network, the second level inverter and the third filter network are sequentially connected；The output end of the third filter network and heating Well connection, the heated well is along the soil that depth of soil direction is embedded in target area；

The three-phase half-controlled rectifier circuit is used to the three-phase alternating current that the AC power source provides being converted to first kind direct current Electricity, first filter network are used to filter out the noise of the first kind direct current, and the level-one inverter is made an uproar for that will filter out The first kind direct current after sound is converted to single-phase alternating current, and the high-frequency step-up transformer is for improving the single phase ac The frequency of electricity and the voltage for improving the single-phase alternating current, the uncontrollable rectifier circuit are used for the high-frequency step-up transformer is defeated The single-phase alternating current out is converted to the second class direct current, and second filter network is for filtering out the second class direct current Noise, the second level inverter is used to filter out the second class direct current after noise and is converted to first object three-phase alternating current Electricity, the changeable frequency of the first object three-phase alternating current；The third filter network is for changing the first object three-phase The waveform of alternating current, obtains the second target three-phase alternating current of sinusoidal waveform, and the second target three-phase alternating current is used for as institute State heated well power supply.

2. resistance heating original position thermal desorption electric system according to claim 1, which is characterized in that the level-one inverter It is the inverter based on pulse width modulation with the second level inverter.

3. resistance heating original position thermal desorption electric system according to claim 1, which is characterized in that further include: extraction tube；

One end of the extraction tube is arranged in the soil of the target area, and the other end and cleaning equipment of the extraction tube connect It connects；

The extraction tube is for exporting the gasification pollutant in the soil of the target area to the cleaning equipment.

4. resistance heating original position thermal desorption electric system according to any one of claim 1-3, which is characterized in that also wrap It includes: step voltage detection device；

The soil surface of the target area, and the horizontal distance with the heated well is arranged in the step voltage detection device For pre-determined distance, for measuring the step voltage at the pre-determined distance.

5. resistance heating original position thermal desorption electric system according to claim 4, which is characterized in that further include: water injection pipe, One end of the water injection pipe is arranged in the soil of the target area, and the other end of the water injection pipe is connected to water source, described Position on water injection pipe close to the other end is equipped with water injection valve.

6. resistance heating original position thermal desorption electric system according to claim 5, which is characterized in that further include: energy supply is single Elementary current detection device, supply unit voltage check device and central processing unit；

The supply unit current detection means is connect with the output end of the third filter network, single for measuring the energy supply The current value of member output；The supply unit voltage check device is connect with the output end of the third filter network, for surveying Measure the voltage value of the supply unit output；

The central processing unit respectively with the supply unit current detection means, the supply unit voltage check device, institute It states level-one inverter to connect with the second level inverter, the central processing unit is used for according to the current value and the voltage Value, adjusts the parameter of the level-one inverter and the parameter of the second level inverter, until the power of supply unit output It is worth identical as the power demand values in the soil of the target area.

7. resistance heating original position thermal desorption electric system according to claim 6, which is characterized in that the central processing unit It is also connect with the step voltage detection device, the central processing unit according to the step voltage detection device for measuring The step voltage arrived disconnects the resistance heating original position thermal desorption electric system and the AC power source.

8. resistance heating original position thermal desorption electric system according to claim 6, which is characterized in that the water injection valve is electricity Movable valve.

9. resistance heating original position thermal desorption electric system according to claim 8, which is characterized in that further include: humidity passes Sensor, the humidity sensor are arranged in the soil of the target area, for measuring the soil moisture of the target area；

The central processing unit is connect with the humidity sensor, and the central processing unit is used to be controlled according to the soil moisture The water injection valve is opened.

10. resistance heating original position thermal desorption electric system according to claim 6, which is characterized in that further include: isolation is driven Dynamic device；

The isolation drive device is used to for the central processing unit and the supply unit being isolated.