CN109719125A - Thermal desorption device and its control method - Google Patents
Thermal desorption device and its control method Download PDFInfo
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- CN109719125A CN109719125A CN201910068146.2A CN201910068146A CN109719125A CN 109719125 A CN109719125 A CN 109719125A CN 201910068146 A CN201910068146 A CN 201910068146A CN 109719125 A CN109719125 A CN 109719125A
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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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/18—Treatment of sludge; Devices therefor by thermal conditioning
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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
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
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Abstract
A kind of thermal desorption device, including the heat treatment box for carrying out heating desorption to material；Feeding screw is installed, the shaft of feeding screw is provided with the heating chamber that can be passed through high-temperature flue gas, and feeding screw forms double helix feeding mechanism in the heat treatment box.Thermal desorption control method is by temperature of charge, heating temperature and flue-gas temperature, and control hot-blast stove is according to certain heat treatment work, and flue gas is according to a certain amount of discharge.The feeding screw of thermal desorption device setting, heating chamber is arranged in shaft at its center, it is coated on material around feeding screw, is moved under its driving, while internal heating can be formed to material, it is uniformly heated material, heat quickly can adequately disperse, and alleviate the accumulation thermomechanically damaged in equipment, extend equipment life, guarantee the long-term operation of equipment, and improves treatment effeciency.By the heat power output control of feeding speed control, the control of flue gas recirculation amount and hot-blast stove, enables material long lasting for thermal desorption reaction is carried out, improve treatment effeciency.
Description
Technical field
The invention belongs to technical field of soil remediation more particularly to a kind of thermal desorption device and its control methods.
Background technique
Dystopy thermal desorption technology has contaminant removal efficiency height, repairing efficiency to organic polluted soil site remediation because of it
Short, the advantages that universality is strong, Environmental Protection Agency recommended technology just it has been selected in early in 1985.According to U.S.'s super fund
Project report (2017), more than 69 super fund places use dystopy thermal desorption technology, accounting 5.6%；According to " Chinese work
Industry contaminated site repairs reviews and prospects " (2018), have 23 organic contamination places and uses dystopy thermal desorption technology, accounting
16.0%.However existing China's dystopy thermal desorption technology equipment, generally existing energy consumption height, equipment fluctuation of service, core component
The problems such as service life is short has been difficult to meet the requirement of soil remediation industry.
Application No. is the Chinese patent application of CN201410376955.7, disclose a kind of oilfield waste substance treating method with
And system, built-in single-screw furnace tube is heated using the high-temperature flue gas of combustion chamber, the flue gas after heat exchange is discharged from chimney.But the dress
It sets and its processing method has the following problems: first, fume afterheat is expelled directly out without reuse, and the thermal efficiency is less than 50%；Second,
Material conveying is carried out using single coil configuration, viscous material is hardened on blade, and it is easily that spiral is stuck, force equipment downtime clear
Reason；Third, using heating method outside furnace tube, furnace tube bottom centralized head load can generate obvious thermal deformation and influence service life.
Application No. is the Chinese patent application of CN201710376000.5, a kind of circulating heat supply system and its heat supply are disclosed
Method, the internal heating chamber of flue gas in outer heating chamber using circulation are heated, and the flue gas after heat exchange returns to combustion chamber and height
Warm flue gas carry out mixing temperature adjustment to formed needed for heating flue gas, pyrolysis desorption apparatus in generate pyrolysis desorption gas directly into
It burns the second combustion zone for entering combustion chamber.But the system and its heat supply method are added using the internal heating chamber periphery of flue gas
Heat, since intracavitary bottoms material persistently absorbs heat, will lead to interior heating cavity shell long period, to be in uneven heating even and generate significant
In the state of strain, accelerate its fatigue failure, in addition, containing a large amount of water vapour and gaseous pollutant in pyrolysis desorption gas, not
Handled directly burning, can cause to burn insufficient, atmosphere secondary pollution (such as dioxin-like chemical) the problems such as.
Summary of the invention
The present invention above-mentioned thermal desorption processing equipment there are aiming at the problem that, propose that a kind of equipment operation stability is high, heating
Uniformly, consume energy lower thermal desorption device and its control method.
In order to achieve the above object, the technical solution adopted by the present invention are as follows:
A kind of thermal desorption device, including thermal desorption processing unit, the thermal desorption processing unit include for material into
The heat treatment box of row heating desorption；
Feeding screw is installed, feeding screw can rotate in heat treatment box, will be from heat in the heat treatment box
The discharge port for the material conveying heat treated case that the feed inlet for the treatment of box is sent into；
The shaft of feeding screw is provided with the heating chamber that can be passed through high-temperature flue gas, to add to the material of conveying
Thermal desorption；
Feeding screw is arranged in parallel two groups, forms double helix feeding mechanism.
Preferably, the heating chamber connects hot-blast stove by air supply pipeline, to the high-temperature flue gas for generating hot-blast stove
It is sent into heating chamber；The heating chamber connects hot-blast stove by air return pipeline, will send back to the high-temperature flue gas after material heating
Hot-blast stove heats again.
Preferably, the heating chamber is arranged along the axial direction of shaft, one end connects air supply pipeline, and the other end connects backwind tube
Road installs blower on the air return pipeline, provides power with for circulating for high-temperature flue gas.
Preferably, the series winding setting of thermal desorption processing unit is multiple, contacted between the heating chamber of heat treatment box by pipeline,
The feed inlet of the discharge port of heat treatment box and heat treatment box in next stage thermal desorption processing unit in level-one thermal desorption processing unit
It is connected, to will heating desorption treated material is sent to next stage heat in heat treatment box in level-one thermal desorption processing unit
Heating desorption processing is carried out in heat treatment box in desorption processing unit.
Preferably, the smoke inlet of heating chamber connects hot wind by air supply pipeline in afterbody thermal desorption processing unit
Furnace, in afterbody thermal desorption processing unit in the outlet flue and upper level thermal desorption processing unit of heating chamber heating chamber into cigarette
Mouth is connected, and the outlet flue of heating chamber connects hot-blast stove by air return pipeline in first order thermal desorption processing unit.
Preferably, the exhaust outlet of heat treatment box connects spray equipment, to the gas phase mixture point that exhaust outlet is discharged
For gas phase and liquid phase；
Spray equipment connects gas-liquid separator, and gaseous substance and its to export spray equipment carry droplet secretly and carry out gas
Liquid separation；
Spray equipment connects oil water separator, and the liquid phase mixture to export spray equipment carries out water-oil separating.
A kind of thermal desorption control method, the by adopting the above technical scheme thermal desorption device, the controlling party of thermal desorption device
Method includes:
The high-temperature flue gas of setting thermal desorption processing unit enters temperature T1Smoke temperature degree T is returned with high-temperature flue gas2, calculate thermal desorption
The heat exchange logarithmic mean temperature difference (LMTD) △ tm of processing unit:
Wherein, t1For the initial temperature for the treatment of material, t2For the suitable heating temperature for the treatment of material；
Calculate total heat exchange power q of thermal desorption processing unit:
Q=h × A × △ tm；
Wherein, h is Composite Walls, and A is the internal surface area of heating chamber；
Calculate the heat Q ' that the treating material per ton into thermal desorption processing unit need to absorb:
Wherein, a is the moisture content for the treatment of material, and b is the oil content for the treatment of material,For water in treating material
The avergae specific heat divided, CoilFor the avergae specific heat of oil in treating material, CsolidFor the average specific of solid phase in treating material
Heat,For the latent heat of vaporization of moisture in treating material, hoilFor the latent heat of vaporization of oil in treating material；
Calculate the inlet amount F per hour of thermal desorption processing unit:
Calculate the flue gas input quantity M of thermal desorption processing unitin:
Wherein, △ H is unit quality High Temperature flue gas from T1It is down to T2When enthalpy difference；
Calculate the practical heat power output W and amount of circulating gas M of the connected hot-blast stove of thermal desorption processing unitr:
Wherein, ρ0The smoke density directly generated for the fuel combustion of hot-blast stove；
Hot-blast stove is controlled according to calculated heat power output W work；
The air return pipeline of control hot-blast stove connection is exhausted, and the exhaust gas volumn of discharge is Me, Me=Min-Mr。
Preferably, high-temperature flue gas enters temperature T1It is set as 800~850 DEG C, high-temperature flue gas returns smoke temperature degree T2It is set as
200~450 DEG C, Composite Walls h is set as 20~40W/m2·K。
Preferably, the initial temperature t for the treatment of material1Take current room temperature or material Current Temperatures；Treating material is
It is suitable for heating temperature t when light oil type organic polluted soil2Value be 250~300 DEG C；Treating material is that crude oil class is organic
It is suitable for heating temperature t when contaminated soil2Value be 350~400 DEG C；When treating material is pesticide organic polluted soil,
It is suitable for heating temperature t2Value be 450~500 DEG C.
Preferably, high-temperature flue gas enters temperature T when the thermal desorption processing unit series winding of the thermal desorption device is multiple1
For enter afterbody thermal desorption processing unit heating chamber when high-temperature flue gas temperature, high-temperature flue gas return smoke temperature degree T2For from
The temperature of the high-temperature flue gas of the heating chamber discharge of level-one thermal desorption processing unit, A are whole thermal desorption processing unit heating chambers
The sum of internal surface area.
Compared with prior art, the advantages and positive effects of the present invention are:
1, the feeding screw of thermal desorption device setting, shaft at its center are arranged heating chamber, are coated on material
It around feeding screw, is moved under its driving, while internal heating can be formed to material, keep material heated more
Even, heat quickly can adequately disperse, and alleviate the accumulation thermomechanically damaged in equipment, extend equipment life, guarantee equipment
Long-term operation, and improve treatment effeciency.
2, feeding screw is arranged in parallel two groups, forms double helix feeding mechanism, and spiraling vane portions are overlapping, can be mutual
The material for striking off gluing on blade avoids material hardened over the paddle, prevents from therefore causing spiral card group, guarantees that spiral is sent
The smooth rotation of glassware, thus the stability of lifting means operation.
3, heating chamber connects hot-blast stove with air return pipeline by air supply pipeline, and the high-temperature flue gas for enabling hot-blast stove to generate follows
Circulation is dynamic, so that material is constantly heated sufficiently, while the waste heat of flue gas can send back to hot-blast stove, heat again, drops
The energy consumption of low-heat wind furnace reduces the energy consumption of equipment operation.Flue gas is flowed by shaft one end, other end outflow, can be axial
Flowing, sufficiently heats each position of heating chamber, improves heating covering surface.
4, thermal desorption processing unit series winding is multiple, can thermal energy in Multi-class propagation high-temperature flue gas, multistage is carried out to material
Adverse current heats, and enhances the utilization efficiency of thermal energy.
5, the gas phase mixture that thermal desorption goes out is divided into liquid and gas by spray, then carries out water-oil separating and gas-liquid respectively
Separation, oleaginous material is recycled, realizes the recycling of resource；Pernicious gas carries out burning processing, can make remaining pollutant
Burning sufficiently, prevents secondary pollution.
6, thermal desorption device is made by the heat power output control of feeding speed control, the control of flue gas recirculation amount and hot-blast stove
Material can improve treatment effeciency long lasting for thermal desorption reaction is carried out；The thermal energy of flue gas can be utilized adequately simultaneously, and one
Material is heated in part, a part recycling reheating, rest part discharge, and hot-blast stove is able to maintain that the operating of low-energy-consumption high-efficiency.
Detailed description of the invention
Fig. 1 is the structural schematic diagram one of thermal desorption device；
Fig. 2 is the structural schematic diagram two of thermal desorption device；
Fig. 3 is the structural schematic diagram of double screw conveyor structure；
In above each figure: 1, thermal desorption processing unit；11, heat treatment box；111, feed inlet；112, discharge port；113, it arranges
Port；12, feeding screw；121, shaft；13, heating chamber；131, smoke inlet；132, outlet flue；2, hot-blast stove；31, it blows
Pipeline；32, air return pipeline；4, blower；5, spray equipment；6, gas-liquid separator；7, oil water separator.
Specific embodiment
In the following, the present invention is specifically described by illustrative embodiment.It should be appreciated, however, that not into one
In the case where step narration, element, structure and features in an embodiment can also be advantageously incorporated into other embodiments
In.
In the description of the present invention, it should be noted that the instruction such as term "inner", "outside", "upper", "lower", "front", "rear"
Orientation or positional relationship be positional relationship based on the figure, be merely for convenience of description of the present invention and simplification of the description, and
It is not that the device of indication or suggestion meaning or element must have a particular orientation, be constructed and operated in a specific orientation, therefore
It is not considered as limiting the invention.In addition, term " first ", " second ", " third " are used for description purposes only, and cannot manage
Solution is indication or suggestion relative importance.
As shown in Figure 1, thermal desorption device includes thermal desorption processing unit 1, thermal desorption processing unit 1 includes for material
Carry out the heat treatment box 11 of heating desorption.
As shown in figure 3, being equipped with feeding screw 12 in heat treatment box 11, feeding screw 12 is in motor equal power device
Driving under rotate, the helical blade 122 on feeding screw 12 rotates with, push heat treatment box 11 in material along its axis
To movement.
There is feed inlet 111 and discharge port 112, material to be processed is sent to by feed inlet 111 on heat treatment box 11
It in heat treatment box 11, is then moved in heat treatment box 11 under the driving of feeding screw 12, is sent to discharge port 112 and is discharged to
Outside heat treatment box 11.
The shaft 121 of feeding screw 12 is provided with heating chamber 13, and heating chamber 13 is connected with high-temperature flue gas, to the material of conveying
It is heated, the gas phase mixture containing pollutant is generated, to realize the thermal desorption treatment process of organic polluted soil.
The gas phase mixture containing pollutant that thermal desorption goes out from material, the exhaust outlet 113 being arranged by heating chamber 13
Discharge, carries out subsequent recycling, harmless treatment.
The heating chamber 13 that feeding screw 12 is arranged forms internal heating to the material covered around it, makes the heat of heat source
Radially by feeding screw 12, the rate of dispersion that can accelerate heat, avoid thermal stress is concentrically formed thermomechanical damage
Accumulation guarantee the long-term operation of equipment to extend equipment life, can it is more efficient to material carry out thermal desorption at
Reason.
Feeding screw 12 is arranged in parallel two groups, forms double helix feeding mechanism.Form two groups of double helix feeding mechanism
Feeding screw 12, helical blade 122 is mutually overlapping, i.e., one group of helical blade is extend into the screw pitch of another group of helical blade.
The double helix feeding mechanism of two feeding screws 12 composition, helical blade 122 can be scraped mutually and be adhered to it
On material, avoid material hardened on helical blade surface and cause spiral card resistance, guarantee the smooth rotation of feeding screw,
To the stability of lifting means operation.
In order to provide high-temperature flue gas to heating chamber 13, heating chamber 13 passes through piping connection hot-blast stove 2.Hot-blast stove 2 passes through combustion
The fuel such as natural gas, diesel oil are burnt, high-temperature flue gas is generated, heating chamber 13 is sent by pipeline, makes feeding screw 12 while carrying out
The conveying and heating of material.
Connect the pipeline of heating chamber 13 and hot-blast stove 2, including air supply pipeline 31 and air return pipeline 32.What hot-blast stove 2 generated
High-temperature flue gas is sent in heating chamber 13 by air supply pipeline 31, is then returned in hot-blast stove 2 by air return pipeline 32 again, again
Burned fuel heating, forms the circulation of high-temperature flue gas.
The high-temperature flue gas of hot-blast stove 2 is sent back to by air return pipeline 32, still there is certain waste heat, it is only necessary to less combustion
Material burning can be again heated to required temperature, and be sent into heating chamber 13 by air supply pipeline 31, and hot-blast stove 2 is reduced
Energy consumption.
In order to guarantee the efficient utilization of thermal energy, heating chamber 13 is sufficiently distributed on 12 length direction of feeding screw, is increased
The heated length and area of material.
13 one end of heating chamber connects air supply pipeline 31, and the other end connects air return pipeline 32, enables the high-temperature flue gas being passed through
Each position on 13 length direction of heating chamber is flowed completely through, sufficiently to positioned at each position on 12 length direction of feeding screw
Material heated, improve the utilization rate of thermal energy.
In order to circulate offer power to high-temperature flue gas, blower 4 is installed, blower 4 can be located at smoke evacuation on air return pipeline
Mouth upstream may be alternatively located at smoke outlet downstream, and passes through frequency and adjust control loop exhaust gas volumn.
In order to more fully utilize the thermal energy of high-temperature flue gas, the series winding setting of thermal desorption processing unit 1 is multiple.
It is contacted between the heating chamber 13 of multiple thermal desorption processing units 1 by pipeline, enters the high-temperature flue gas being passed through
In each thermal desorption processing unit, material is heated.
The discharge port 112 of heat treatment box 11 and heat in next stage thermal desorption processing unit 1 in level-one thermal desorption processing unit 1
The feed inlet 111 for the treatment of box 11 is connected, will heat desorption processing in level-one thermal desorption processing unit 1 in heat treatment box 11
Heating desorption processing is carried out in the heat treatment box 11 that material afterwards is sent in next stage thermal desorption processing unit 1.
In order to improve the utilization rate of thermal energy in high-temperature flue gas, in afterbody thermal desorption processing unit 1 heating chamber 13 into
Mouth 131 connects hot-blast stove 2 by air supply pipeline 31, the outlet flue 132 of heating chamber 13 in afterbody thermal desorption processing unit 1
It is connected with the smoke inlet 131 of heating chamber 13 in upper level thermal desorption processing unit 1, is heated in first order thermal desorption processing unit 1
The outlet flue 132 of chamber 13 connects hot-blast stove 2 by air return pipeline 32.
As shown in Fig. 1 to 2, for the series winding of thermal desorption processing unit 1 setting two, two thermal desorption processing units 1 divide
It Wei not level-one thermal desorption processing unit and second level thermal desorption processing unit.
Material is sent in its heat treatment box 11 by the feed inlet 111 of level-one thermal desorption processing unit, material is one
Heating in the heat treatment box 11 of grade thermal desorption processing unit carries out the thermal desorption processing of first stage, passes through one after the completion of processing
The discharge port 112 of grade thermal desorption processing unit is discharged, and subsequently enters the feed inlet of coupled second level thermal desorption processing unit
111, the heat treatment box 11 for being sent to second level thermal desorption processing unit carries out the thermal desorption processing of second stage, logical after the completion of processing
The discharge port 112 for crossing second level thermal desorption processing unit is discharged.
And high-temperature flue gas is entered in its heating chamber 13 by the smoke inlet 131 of second level thermal desorption processing unit, first into
The material of row second stage thermal desorption processing is heated, and with higher temperature, is not adequately had the processing of first stage thermal desorption
There is the pollutant isolated to be desorbed out.Flue gas leaves second level thermal desorption processing unit by outlet flue 132, and entrance is coupled
The smoke inlet 131 of level-one thermal desorption processing unit is sent in the heating chamber 13 of level-one thermal desorption processing unit, to starting material
The thermal desorption processing of first stage is carried out, the temperature of flue gas is still significantly larger than the temperature of starting material at this time, can be in the first stage
Most of pollutant is desorbed out, to make full use of the heat in flue gas by stages, improves the heat utilization ratio of flue gas,
Improve the thermal desorption efficiency of material.
As shown in Fig. 2, in order to which the pollutant come out to thermal desorption carries out recycling and harmless treatment, heat treatment box 11
Exhaust outlet 113 connects spray equipment 5.
The gas phase mixture with pollutant being discharged by exhaust outlet 113, at the spray condensation of spray equipment 5
Reason sufficiently removes congealing into point in gas phase, generation condensate liquid and fixed gas, so that gas phase mixture is divided into gas phase and liquid
Phase.
Spray equipment 5 connects gas-liquid separator 6 and is sent in gas-liquid separator 6 as the fixed gas of gas phase, and removal is not
After droplet in solidifying gas, it is passed through dual firing chamber and is thoroughly burnt, the flue gas of generation is successively through over-quenching tower, catalytic adsorption tower and leaching
Tower is washed, harmless treatment is carried out, is discharged after meeting atmosphere pollutants emission standards from chimney.
Chilling tower carries out rapid cooling to flue gas using the cooling water of atomization, and catalytic adsorption tower uses catalyst and adsorbent
Filler carries out desulfurization removing nitric processing using lye to remove the substances such as dioxin, heavy metal in above-mentioned fixed gas, eluting column.
Spray equipment 5 connects oil water separator 7 and is sent in oil water separator 7 as the condensate liquid of liquid phase, carries out oil
Water separation, the oil isolated is passed through in caching fuel tank, to be recycled；The water isolated is passed through in caching water tank,
Standby to send back in spray equipment, to condense to the gas phase mixture of entrance, realization is recycled.
It burns compared to the fixed gas for containing a certain amount of pollutant directly to be returned to hot-blast stove, is passed through dual firing chamber
Independent burning is carried out, can ensure the fully oxidized decomposition of pollutant component, and the flue gas that fixed gas burning generates passes through subsequent one
Serial purified treatment can prevent the secondary pollution to environment.
In order to enable thermal desorption operation efficiently and long-term operation, when the application thermal desorption device is run, use is following
Control method is controlled.
Start hot-blast stove, fuel combustion generates high-temperature flue gas, high-temperature flue gas is sent in heating chamber 13 by pipeline, to spiral shell
The material that rotation feed appliance 12 conveys carries out heating desorption.After flue gas heats material, a part is circulated back to hot wind by pipeline
Furnace carries out reheating, and rest part drains into atmosphere.
After thermal desorption device integrally starts running, the heat power output and amount of circulating gas of hot-blast stove are adjusted, until at thermal desorption
The high-temperature flue gas of reason unit enters temperature T1Smoke temperature degree T is returned with high-temperature flue gas2Reach set temperature.
Enter temperature T according to the high-temperature flue gas of setting1Smoke temperature degree T is returned with high-temperature flue gas2, pass through the initial for the treatment of material
Temperature t1With the suitable heating temperature t for the treatment of material2, utilize formula:
Calculate the heat exchange logarithmic mean temperature difference (LMTD) △ tm (DEG C) of thermal desorption processing unit.
The initial temperature t for the treatment of material1Take current room temperature or material Current Temperatures.
It is suitable for heating temperature t when treating material is light oil type organic polluted soil2Value be 250~300 DEG C；To
It is suitable for heating temperature t when processing material is crude oil class organic polluted soil2Value be 350~400 DEG C；Treating material is
It is suitable for heating temperature t when pesticide organic polluted soil2Value be 450~500 DEG C.
According to Combustion of Hot Air Furnace temperature and the normal condition of heating chamber metal material heatproof, high-temperature flue gas is entered into temperature T1
It is manually set to 800~850 DEG C.Since the usual heatproof of hot-blast stove is no more than 450 DEG C, high-temperature flue gas is returned into smoke temperature degree T2Manually set
It is set to 200~450 DEG C.
According to above-mentioned calculated heat exchange logarithmic mean temperature difference (LMTD) △ tm, pass through the interior table of Composite Walls h and heating chamber 13
Area A, utilizes formula:
Q=h × A × △ tm；
Calculate total heat exchange power q (W) of thermal desorption processing unit.
Composite Walls h is set as 20~40W/m2K, internal surface area A (m2) be 13 inner wall of heating chamber surface area.
According to the moisture content a and oil content b for the treatment of material, the avergae specific heat C of moisture in treating materialH2O, oil
Avergae specific heat CoilWith the avergae specific heat C of solid phasesolidAnd in treating material moisture latent heat of vaporization hH2O, oil vaporization
Latent heat hoil, utilize formula:
Calculate the heat Q ' (J) that the treating material per ton into thermal desorption processing unit need to absorb.
Above-mentioned oil content, moisture content, avergae specific heat and the latent heat of vaporization can be detected by existing equipment or method
Out, empirical value can also be directly taken, following numerical value is wherein one group in empirical value.
For 4184J/kgK, CoilFor 1951J/kgK, CsolidFor 795J/kgK,For 2257000J/
Kg, hoilPosition 264945J/kg.
Heat Q ' is absorbed needed for total heat exchange power q and material per ton when according to thermal desorption processing unit actual motion,
Utilize formula:
Calculate the F of inlet amount per hour (t/h) of thermal desorption processing unit.
Thermal desorption processing unit is sent into material into its heat treatment box 11, it is ensured that material obtains according to inlet amount F per hour
The abundant removing of pollutant is realized to enough heats.
Due to the flue gas of thermal desorption processing unit discharge, needs part and recycled, amount of circulating gas is by blower frequency
Control, and remaining flue gas need to be discharged into atmosphere.In order to be accurately controlled to flue gas recirculation amount and discharge rate, need advanced
The flue gas input quantity M of row thermal desorption processing unitinIt calculates.
According to unit mass high-temperature flue gas from T1It is down to T2When enthalpy difference and thermal desorption processing unit in actual work total
Heat exchange power q, utilizes formula:
Calculate the flue gas input quantity M of thermal desorption processing unitin(kg/s), that is, required when guaranteeing that material is sufficiently heated
The exhaust gas volumn being sent into heating chamber 13.
Unit mass high-temperature flue gas is from T1It is down to T2When enthalpy difference △ H, by inquiry hot-blast stove 2 use fuel it is corresponding
Flue gas enthalpy table show that △ H's is retrieved as existing method.
Utilize formula:
Calculate practical heat power output W (W) and the amount of circulating gas M of the connected hot-blast stove of thermal desorption assistant unitr(kg/s)。
The smoke density ρ that the fuel combustion of hot-blast stove directly generates0, value is using following table:
The heat power output of hot-blast stove is its heating power.
Hot-blast stove is controlled according to heat power output W operation, it can be ensured that heating load and the heat exchange amount of thermal desorption processing unit match,
And meet the design conditions of flue gas waste heat-recovering.
According to flue gas input quantity MinWith amount of circulating gas Mr, show that the exhaust gas volumn of discharge is Me(kg/s), Me=Min-Mr。
When the thermal desorption processing unit series winding of thermal desorption device is multiple, high-temperature flue gas enters temperature T1For into afterbody
The temperature of high-temperature flue gas when the heating chamber of thermal desorption processing unit, high-temperature flue gas return smoke temperature degree T2To be handled from first order thermal desorption
The temperature of the high-temperature flue gas of the heating chamber discharge of unit, A are the sum of the internal surface area of whole thermal desorption processing unit heating chambers.
Thermal desorption device is according to the above-mentioned F of inlet amount per hour, practical heat the power output W, flue gas recirculation amount M of hot-blast stoverWork
Make, thermal desorption processing efficiently can be carried out to material, while effectively saving the energy consumption of burning, utilize cigarette to the greatest extent
The waste heat of gas.
Claims (10)
1. a kind of thermal desorption device, which is characterized in that including thermal desorption processing unit (1), thermal desorption processing unit (1) packet
Include the heat treatment box (11) for carrying out heating desorption to material；
It is equipped with feeding screw (12) in the heat treatment box (11), feeding screw (12) can be in heat treatment box (11)
Rotation, the discharge port (112) for material conveying heat treated case (11) that will be sent into from the feed inlet (111) of heat treatment box (11)；
The shaft (121) of feeding screw (12) is provided with the heating chamber (13) that can be passed through high-temperature flue gas, to conveying
Material carries out heating desorption；
Feeding screw (12) is arranged in parallel two groups, forms double helix feeding mechanism.
2. thermal desorption device according to claim 1, which is characterized in that the heating chamber (13) passes through air supply pipeline (31)
It connects hot-blast stove (2), the high-temperature flue gas to generate hot-blast stove (2) is sent into heating chamber (13)；The heating chamber (13) passes through
Air return pipeline (32) connects hot-blast stove (2), heats again will send hot-blast stove (2) back to the high-temperature flue gas after material heating.
3. thermal desorption device according to claim 2, which is characterized in that axis of the heating chamber (13) along shaft (121)
To setting, one end connects air supply pipeline (31), and the other end connects air return pipeline (32), installs blower on the air return pipeline (32)
(4), power is provided with for circulating for high-temperature flue gas.
4. thermal desorption device according to claim 1, which is characterized in that thermal desorption processing unit (1) series winding setting is multiple,
It is contacted between the heating chamber (13) of heat treatment box (11) by pipeline, heat treatment box (11) in level-one thermal desorption processing unit (1)
Discharge port (112) be connected with the feed inlet (111) of heat treatment box (11) in next stage thermal desorption processing unit (1), to
It will treated that material is sent to next stage thermal desorption for heating desorption in heat treatment box (11) in level-one thermal desorption processing unit (1)
Heating desorption processing is carried out in heat treatment box (11) in processing unit (1).
5. thermal desorption device according to claim 4, which is characterized in that add in afterbody thermal desorption processing unit (1)
The smoke inlet (131) of hot chamber (13) passes through air supply pipeline (31) connection hot-blast stove (2), afterbody thermal desorption processing unit (1)
Smoke inlet (131) phase of the outlet flue (132) of middle heating chamber (13) and heating chamber (13) in upper level thermal desorption processing unit (1)
Even, the outlet flue (132) of heating chamber (13) connects hot-blast stove by air return pipeline (32) in first order thermal desorption processing unit (1)
(2)。
6. thermal desorption device according to claim 1, which is characterized in that the exhaust outlet (113) of heat treatment box (11) connects
Spray equipment (5), the gas phase mixture exhaust outlet (113) to be discharged are divided into gas phase and liquid phase；
Spray equipment (5) connects gas-liquid separator (6), and the gaseous substance to export spray equipment (5) carries droplet secretly with it
Carry out gas-liquid separation；
Spray equipment (5) connects oil water separator (7), and the liquid phase mixture to export spray equipment (5) carries out grease point
From.
7. a kind of thermal desorption control method, using any one of claim 1 to 6 thermal desorption device, which is characterized in that heat is de-
The control method of adsorption device includes:
The high-temperature flue gas of setting thermal desorption processing unit enters temperature T1Smoke temperature degree T is returned with high-temperature flue gas2, calculate thermal desorption processing
The heat exchange logarithmic mean temperature difference (LMTD) △ tm of unit:
Wherein, t1For the initial temperature for the treatment of material, t2For the suitable heating temperature for the treatment of material；
Calculate total heat exchange power q of thermal desorption processing unit:
Q=h × A × △ tm；
Wherein, h is Composite Walls, and A is the internal surface area of heating chamber；
Calculate the heat Q ' that the treating material per ton into thermal desorption processing unit need to absorb:
Wherein, a is the moisture content for the treatment of material, and b is the oil content for the treatment of material,For moisture in treating material
Avergae specific heat, CoilFor the avergae specific heat of oil in treating material, CsolidFor the avergae specific heat of solid phase in treating material,For the latent heat of vaporization of moisture in treating material, hoilFor the latent heat of vaporization of oil in treating material；
Calculate the inlet amount F per hour of thermal desorption processing unit:
Calculate the flue gas input quantity M of thermal desorption processing unitin:
Wherein, △ H is unit quality High Temperature flue gas from T1It is down to T2When enthalpy difference；
Calculate the practical heat power output W and amount of circulating gas M of the connected hot-blast stove of thermal desorption processing unitr:
Wherein, ρ0The smoke density directly generated for the fuel combustion of hot-blast stove；
Hot-blast stove is controlled according to calculated heat power output W work；
The air return pipeline of control hot-blast stove connection is exhausted, and the exhaust gas volumn of discharge is Me, Me=Min-Mr。
8. thermal desorption control method according to claim 7, which is characterized in that high-temperature flue gas enters temperature T1It is set as 800
~850 DEG C, high-temperature flue gas returns smoke temperature degree T2It is set as 200~450 DEG C, Composite Walls h is set as 20~40W/m2·K。
9. thermal desorption control method according to claim 7, which is characterized in that the initial temperature t for the treatment of material1It takes and works as
Preceding room temperature or material Current Temperatures；It is suitable for heating temperature t when treating material is light oil type organic polluted soil2Value be
250~300 DEG C；It is suitable for heating temperature t when treating material is crude oil class organic polluted soil2Value be 350~400 DEG C；
It is suitable for heating temperature t when treating material is pesticide organic polluted soil2Value be 450~500 DEG C.
10. thermal desorption control method according to claim 7, which is characterized in that at the thermal desorption of the thermal desorption device
When reason unit series winding is multiple, high-temperature flue gas enters temperature T1For enter afterbody thermal desorption processing unit heating chamber when high temperature
The temperature of flue gas, high-temperature flue gas return smoke temperature degree T2For the high-temperature flue gas that is discharged from the heating chamber of first order thermal desorption processing unit
Temperature, A are the sum of the internal surface area of whole thermal desorption processing unit heating chambers.
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