CN109675921A - The continuous direct thermal desorption system of organic polluted soil and its thermal desorption method - Google Patents
The continuous direct thermal desorption system of organic polluted soil and its thermal desorption method Download PDFInfo
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- CN109675921A CN109675921A CN201910025023.0A CN201910025023A CN109675921A CN 109675921 A CN109675921 A CN 109675921A CN 201910025023 A CN201910025023 A CN 201910025023A CN 109675921 A CN109675921 A CN 109675921A
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- thermal desorption
- condenser
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- direct thermal
- fire grate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/06—Reclamation of contaminated soil thermally
- B09C1/065—Reclamation of contaminated soil thermally by pyrolysis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/005—Extraction of vapours or gases using vacuum or venting
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- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The present invention discloses a kind of direct thermal desorption system of continuous organic polluted soil and its thermal desorption method, the system include vertical direct thermal desorption furnace, humidifier, combustion fan, condenser, water treatment facilities, oxidizing chamber, heat exchanger, flue gas purification device, air-introduced machine and chimney；This method includes being entered in vertical direct thermal desorption furnace by feed hopper and the first flapper, moisture and organic matter in contaminated soil are desorbed out in the form of pyrolysis gas after A, contaminated soil pre-process after crushing and screening；B, the pyrolysis gas that the moisture and organic matter that are desorbed out in contaminated soil are formed is discharged from the top of vertical direct thermal desorption furnace, and pyrolysis gas is completed to condense within the condenser, and moisture and organic matter, which are condensed into liquid and enter in water treatment facilities, to be handled；In the use of the present invention, avoiding the big disadvantage of Dust Capacity caused by material largely stirs in rotary thermal desorptor, and stability is improved, while improving the thermal efficiency of system entirety.
Description
Technical field
The present invention relates to contaminated soil remediation engineering device technique fields, and in particular to a kind of continuous organic polluted soil is directly warm
Desorption system and its thermal desorption method.
Background technique
Thermal desorption technology is obvious for organic polluted soil and mercury contaminated soil disposition effect, is widely used in above-mentioned dirt
Contaminate the reparation of soil.Thermal desorption technology is divided into indirect thermal desorption and direct thermal desorption two major classes according to heating method at present, according to
Whether excavation is divided into thermal desorption in situ and dystopy thermal desorption two major classes.That there are treating capacities is small for indirect thermal desorption, to pretreatment of raw material
Demanding disadvantage, and directly thermal desorption just overcomes disadvantages mentioned above.The direct thermal desorption equipment of common dystopy is using revolution
Formula thermal desorptor is haveed the shortcomings that tail is large-minded, the thermal efficiency is low, such as patent CN102357521A, is burnt using bumer of light fuel
The hot fume direct contact heat transfer of generation, but because of the agitation of material in rotary thermal desorptor, Dust Capacity is larger, at tail gas
Reason amount is big；In addition organic matter, which enters after dual firing chamber is burned to 1200 DEG C, is directly entered vent gas treatment complexes, not to waste heat
It is recycled, therefore energy consumption is higher.Patent CN108405590A increases indirect type kin for CN102357521A,
Reduce exhaust gas volumn, and increase heat exchanger, the high-temperature flue gas waste heat generated to combustion decomposition device is recycled, relatively
The patent CN102357521A thermal efficiency increases.But whole system is limited to the efficiency of indirect type kin, disposed of in its entirety
Ability is relatively low, and link increase equipment operation stability is poor.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of direct thermal desorption system of continuous organic polluted soil and its heat
Desorption method, when in use, material move from top to bottom in thermal desorption reactor, avoid object in rotary thermal desorptor
The big disadvantage of Dust Capacity caused by material largely stirs, and material is completed to preheat in vertical direct thermal desorption furnace and is desorbed, equipment
Structure is more compact, and material handling capacity is big, improves stability, meanwhile, the moisture condensed out from condenser is filled through water process
The humidification water after purifying as humidifier is set, the zero-emission of sewage is realized, and to the hot fume that oxidizing chamber comes out, passes through two
Grade heat recovery (first order is the passage of heat in vertical direct thermal desorption furnace, and the second level is heat exchanger), combustion air passes through
Condenser and the preheating of heat exchanger two-stage, further improve the thermal efficiency of system entirety.
The direct thermal desorption system of continuous organic polluted soil of the invention, including vertical direct thermal desorption furnace, humidifier, help
Fire blower, condenser, water treatment facilities, oxidizing chamber, heat exchanger, flue gas purification device, air-introduced machine and chimney；Vertical direct heat is de-
Attached furnace includes rack, is equipped with thermal desorption reactor in rack, and the upper end of thermal desorption reactor is equipped with the first flapper, and first
The upper end of flapper is equipped with feed hopper, and fire grate has been rotatably coupled in thermal desorption reactor, has been provided on the side wall of fire grate
Several gas ports, the speed reducer for driving fire grate to rotate is equipped in rack, and fire grate is passed by transmission mechanism and speed reducer
Dynamic connection, is equipped with the first burner in the rack below fire grate, and the first burner is communicated with smoke guide pipe, thermal desorption reaction
The discharge outlet of device lower end is equipped with discharge bucket, and the lower end of discharge bucket is fixed with the second flapper, the outside of thermal desorption reactor
It is arranged with collet, forms the passage of heat passed through for hot fume or conduction oil between collet and the outer wall of thermal desorption reactor,
Collet is fixed with thermal desorption reactor；Pyrolysis gas row's mouth of thermal desorption reactor head is connected to the first end of condenser, is condensed
The second end of device is connected to water treatment facilities, and water treatment facilities is connected to humidifier, and the second flapper is connected to humidifier, condensation
The third end of device is connected to oxidizing chamber, and the 4th end of condenser is connected to the third end of heat exchanger, combustion fan and condenser
The connection of 5th end, oxidizing chamber are connected to passage of heat, and the second burner, the upper end of passage of heat and heat exchange are equipped on oxidizing chamber
The first end of device is connected to, and the 4th end of heat exchanger is connected to the first burner and the second burner, the second end and cigarette of heat exchanger
Air purifying apparatus connection, flue gas purification device are connected to air-introduced machine, and air-introduced machine is connected to chimney.
The direct thermal desorption system of continuous organic polluted soil of the invention, wherein fire grate is in eccentric setting.
The direct thermal desorption system of continuous organic polluted soil of the invention, wherein be provided on the periphery wall of fire grate lower end
Several are in circumferential equally distributed roll flute.
A kind of thermal desorption method of the direct thermal desorption system of continuous organic polluted soil, comprising the following steps:
A, after contaminated soil pre-processes after crushing and screening, vertical direct thermal desorption is entered by feed hopper and the first flapper
In furnace, contaminated soil moves from top to down, and the hot fume that the first burner combustion generates moves from the bottom up, hot fume and material
Counterflow heat exchange, moisture and organic matter in contaminated soil are desorbed out in the form of pyrolysis gas, and the clean soil after desorption is in furnace
It under the rotary action of row, falls after broken arch, crushing, and by being entered in humidifier after discharge bucket and the second flapper, takes off
It is discharged from humidifier after the humidified machine humidification of attached clean soil；
B, the pyrolysis gas that the moisture and organic matter that are desorbed out in contaminated soil are formed is from the top of vertical direct thermal desorption furnace
After portion's discharge, pyrolysis gas are completed to condense within the condenser, while pyrolysis gas carries out level-one preheating to the air of combustion fan, moisture
Liquid is condensed into organic matter enters in water treatment facilities and handled, enter humidifier through the purified water of water treatment facilities
It is middle to be used as humidification water；The fixed gas come out from condenser enters oxidizing chamber, in the combustion-supporting lower decomposing organic matter of the second burner,
The high-temperature flue gas of generation enters in passage of heat, and high-temperature flue gas enters in heat exchanger after heating to contaminated soil, right
Second level preheating is carried out from the air after level-one preheats being discharged in condenser, gas cleaning is entered by the flue gas that heat exchanger is discharged
In device, by the purified flue gas of flue gas purification device by smoke stack emission under the action of air-introduced machine, after two-stage preheats
Hot-air be used as the first burner and the second burner combustion air.
In the use of the present invention, material moves from top to bottom in thermal desorption reactor, rotary thermal desorptor is avoided
The big disadvantage of Dust Capacity caused by interior material largely stirs, and material is completed to preheat and is desorbed in vertical direct thermal desorption furnace,
Device structure is more compact, and material handling capacity is big, improves stability, meanwhile, the moisture condensed out from condenser through water from
The humidification water after device purifies as humidifier is managed, the zero-emission of sewage is realized, and to the hot fume that oxidizing chamber comes out, is led to
Cross two-stage heat recovery (first order is the passage of heat in vertical direct thermal desorption furnace, and the second level is heat exchanger), combustion air
It is preheated by condenser and heat exchanger two-stage, further improves the thermal efficiency of system entirety.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present application, constitutes part of this application, this Shen
Illustrative embodiments and their description please are not constituted an undue limitation on the present application for explaining the application.In the accompanying drawings:
Fig. 1 is systematic schematic diagram of the invention；
Fig. 2 is partial cross-sectional structural diagram of the invention；
Fig. 3 is amplified structural schematic diagram at A in Fig. 2；
Fig. 4 is amplified structural schematic diagram at B in Fig. 2.
Specific embodiment
Multiple embodiments of the invention will be disclosed with schema below, as clearly stated, the details in many practices
It will be explained in the following description.It should be appreciated, however, that the details in these practices is not applied to limit the present invention.Also
It is to say, in some embodiments of the invention, the details in these practices is non-essential.In addition, for the sake of simplifying schema,
Some known usual structures and component will be painted it in the drawings in simply illustrative mode.
In addition, the description for being such as related to " first ", " second " in the present invention is used for description purposes only, not especially censure
The meaning of order or cis-position, also non-to limit the present invention, the component described just for the sake of difference with same technique term
Or operation, it is not understood to indicate or imply its relative importance or implicitly indicates the number of indicated technical characteristic
Amount." first " is defined as a result, the feature of " second " can explicitly or implicitly include at least one of the features.In addition, each
Technical solution between a embodiment can be combined with each other, but must can be implemented as base with those of ordinary skill in the art
Plinth will be understood that the combination of this technical solution is not present when conflicting or cannot achieve when occurs in the combination of technical solution,
Also not the present invention claims protection scope within.
The direct thermal desorption system of continuous organic polluted soil of the invention, including vertical direct thermal desorption furnace 1, humidifier 2,
Combustion fan 3, condenser 4, water treatment facilities 5, oxidizing chamber 6, heat exchanger 7, flue gas purification device 8, air-introduced machine 9 and chimney 91；
Vertical direct thermal desorption furnace 1 includes rack 11, is equipped with thermal desorption reactor 12, the upper end of thermal desorption reactor 12 in rack 11
First flapper 13 is installed, the upper end of the first flapper 13 is equipped with feed hopper 14, in thermal desorption reactor 12 rotationally
It is connected with fire grate 15, several gas ports 151 are provided on the side wall of fire grate 15, are equipped in rack 11 for driving fire grate 15
The speed reducer 16 of rotation, fire grate 15 are sequentially connected by transmission mechanism 161 and speed reducer 16, the rack 11 positioned at 15 lower section of fire grate
On the first burner 17 is installed, the first burner 17 is communicated with smoke guide pipe 171, the discharge outlet of 12 lower end of thermal desorption reactor
Discharge bucket 18 is installed, the lower end of discharge bucket 18 is fixed with the second flapper 19, and the outer cover of thermal desorption reactor 12 is equipped with folder
Set 10 forms the passage of heat 101 passed through for hot fume or conduction oil between collet 10 and the outer wall of thermal desorption reactor 12,
Collet 10 and thermal desorption reactor 12 are fixed；Pyrolysis gas row's mouth at 12 top of thermal desorption reactor and the first end of condenser 4 connect
Logical, the second end of condenser 4 be connected to water treatment facilities 5, and water treatment facilities 5 is connected to humidifier 2, the second flapper 19 and is added
Wet machine 2 is connected to, and the third end of condenser 4 is connected to oxidizing chamber 6, and the 4th end of condenser 4 is connected to the third end of heat exchanger 7,
Combustion fan 3 is connected to the 5th end of condenser 4, and oxidizing chamber 6 is connected to passage of heat 101, and the second combustion is equipped on oxidizing chamber 6
The upper end of burner 61, passage of heat 101 is connected to the first end of heat exchanger 7, the 4th end of heat exchanger 7 and the first burner 17 and
The connection of second burner 61, the second end of heat exchanger 7 are connected to flue gas purification device 8, and flue gas purification device 8 and air-introduced machine 9 connect
Logical, air-introduced machine 9 is connected to chimney 91；At work, material is from feed hopper and passes through the first flapper for vertical direct thermal desorption furnace
After enter in thermal desorption reactor, material moves from top to bottom in thermal desorption reactor, speed reducer pass through transmission mechanism band
Dynamic fire grate rotation, material by the agitation of fire grate, it is broken after enter in discharge bucket, enter material in discharge bucket by the
The discharge of two flappers；The high-temperature flue gas that first burner generates simultaneously, a part are sent to thermal desorption reactor through smoke guide pipe
Lower section, the i.e. lower section of fire grate, are then entered in the thermal desorption reactor above fire grate by the gas port on fire grate and and object
Material contact exchanges heat, and another part hot fume enters in furnace from the furnace body hole of thermal desorption reactor bottom, contacts with material
It exchanges heat, so that material sufficiently exchanges heat, the pyrolysis gas formed after vapor and organic matter desorption is moved upwards, gradually to material
Recovery waste heat while heating realizes that the direct thermal desorption of counterflow heat exchange, final pyrolysis gas are discharged from thermal desorption reactor head, into
Enter subsequent exhaust treatment system disposition.
Fire grate 15 is in eccentric setting；After fire grate uses eccentric setting, fire grate can the material to bottom carry out broken agitation,
Be conducive to hot fume rising, can be avoided soil and occur the phenomenon that hardened bridging at high temperature.
Several are provided on the periphery wall of 15 lower end of fire grate in circumferential equally distributed roll flute 152；By under fire grate
Roll flute is set on the outer wall at end, and roll flute can grind bulk materials, be conducive to the reaction efficiency for improving thermal desorption.
A kind of thermal desorption method of the direct thermal desorption system of continuous organic polluted soil, comprising the following steps:
A, after contaminated soil pre-processes after crushing and screening, vertical direct thermal desorption is entered by feed hopper and the first flapper
In furnace, contaminated soil moves from top to down, and the hot fume that the first burner combustion generates moves from the bottom up, hot fume and material
Counterflow heat exchange, moisture and organic matter in contaminated soil are desorbed out in the form of pyrolysis gas, and the clean soil after desorption is in furnace
It under the rotary action of row, falls after broken arch, crushing, and by being entered in humidifier after discharge bucket and the second flapper, takes off
It is discharged from humidifier after the humidified machine humidification of attached clean soil；
B, the pyrolysis gas that the moisture and organic matter that are desorbed out in contaminated soil are formed is from the top of vertical direct thermal desorption furnace
After portion's discharge, pyrolysis gas are completed to condense within the condenser, while pyrolysis gas carries out level-one preheating to the air of combustion fan, moisture
Liquid is condensed into organic matter enters in water treatment facilities and handled, enter humidifier through the purified water of water treatment facilities
It is middle to be used as humidification water；The fixed gas come out from condenser enters oxidizing chamber, in the combustion-supporting lower decomposing organic matter of the second burner,
The high-temperature flue gas of generation enters in passage of heat, and high-temperature flue gas enters in heat exchanger after heating to contaminated soil, right
Second level preheating is carried out from the air after level-one preheats being discharged in condenser, gas cleaning is entered by the flue gas that heat exchanger is discharged
In device, by the purified flue gas of flue gas purification device by smoke stack emission under the action of air-introduced machine, after two-stage preheats
Hot-air be used as the first burner and the second burner combustion air.
Upper is only embodiments of the present invention, is not intended to restrict the invention.To those skilled in the art,
The invention may be variously modified and varied.All any modifications made in spirit and principles of the present invention, equivalent replacement,
Improve etc., it should all be included within scope of the presently claimed invention.
Claims (4)
1. a kind of direct thermal desorption system of continuous organic polluted soil, it is characterised in that: including vertical direct thermal desorption furnace (1),
Humidifier (2), combustion fan (3), condenser (4), water treatment facilities (5), oxidizing chamber (6), heat exchanger (7), gas cleaning dress
Set (8), air-introduced machine (9) and chimney (91)；The vertical direct thermal desorption furnace (1) includes rack (11), on the rack (11)
It being equipped with thermal desorption reactor (12), the upper end of the thermal desorption reactor (12) is equipped with the first flapper (13), and described
The upper end of one flapper (13) is equipped with feed hopper (14), has been rotatably coupled fire grate in the thermal desorption reactor (12)
(15), it is provided with several gas ports (151) on the side wall of the fire grate (15), is equipped on the rack (11) for driving
The speed reducer (16) of fire grate (15) rotation, the fire grate (15) are sequentially connected by transmission mechanism (161) and speed reducer (16), position
It is equipped with the first burner (17) in rack (11) below fire grate (15), first burner (17) is communicated with smoke guide pipe
(171), the discharge outlet of thermal desorption reactor (12) lower end is equipped with discharge bucket (18), the lower end of the discharge bucket (18)
Be fixed with the second flapper (19), the outer cover of the thermal desorption reactor (12) is equipped with collet (10), the collet (10) with
The passage of heat (101) passed through for hot fume or conduction oil, the collet are formed between the outer wall of thermal desorption reactor (12)
(10) fixed with thermal desorption reactor (12)；Pyrolysis gas row's mouth and condenser (4) at the top of the thermal desorption reactor (12)
First end connection, the second end of the condenser (4) are connected to water treatment facilities (5), the water treatment facilities (5) and humidifier
(2) it is connected to, second flapper (19) is connected to humidifier (2), and the third end and oxidizing chamber (6) of the condenser (4) are even
Logical, the 4th end of the condenser (4) is connected to the third end of heat exchanger (7), the combustion fan (3) and condenser (4)
The connection of 5th end, the oxidizing chamber (6) are connected to passage of heat (101), are equipped with the second burner on the oxidizing chamber (6)
(61), the upper end of the passage of heat (101) is connected to the first end of heat exchanger (7), the 4th end of the heat exchanger (7) and the
One burner (17) is connected to the second burner (61), and the second end of the heat exchanger (7) is connected to flue gas purification device (8),
The flue gas purification device (8) is connected to air-introduced machine (9), and the air-introduced machine (9) is connected to chimney (91).
2. the direct thermal desorption system of continuous organic polluted soil according to claim 1, which is characterized in that the fire grate
It (15) is in eccentric setting.
3. the direct thermal desorption system of continuous organic polluted soil according to claim 1, which is characterized in that the fire grate
(15) several are provided on the periphery wall of lower end in circumferential equally distributed roll flute (152).
4. a kind of thermal desorption method of the continuous direct thermal desorption system of organic polluted soil according to claim 1, feature exist
In, comprising the following steps:
A, after contaminated soil pre-processes after crushing and screening, vertical direct thermal desorption furnace is entered by feed hopper and the first flapper
In, contaminated soil moves from top to down, and the hot fume that the first burner combustion generates moves from the bottom up, and hot fume is inverse with material
Stream exchanges heat, and the moisture and organic matter in contaminated soil are desorbed out in the form of pyrolysis gas, and the clean soil after desorption is in fire grate
Rotary action under, fallen after broken arch, crushing, and by being entered in humidifier after discharge bucket and the second flapper, be desorbed
It is discharged from humidifier after the humidified machine humidification of clean soil afterwards；
B, the pyrolysis gas that the moisture and organic matter for being desorbed out in contaminated soil are formed is arranged from the top of vertical direct thermal desorption furnace
Out, after pyrolysis gas is completed to condense within the condenser, while pyrolysis gas carries out level-one preheating to the air of combustion fan, moisture and have
Machine object, which is condensed into liquid and enters in water treatment facilities, to be handled, and is entered in humidifier through the purified water of water treatment facilities and is made
For humidification water；The fixed gas come out from condenser enters oxidizing chamber, in the combustion-supporting lower decomposing organic matter of the second burner, generates
High-temperature flue gas enter in passage of heat, high-temperature flue gas enters in heat exchanger after heating to contaminated soil, to from cold
The air after level-one preheats being discharged in condenser carries out second level preheating, enters flue gas purification device by the flue gas that heat exchanger is discharged
In, by heat of the purified flue gas of flue gas purification device under the action of air-introduced machine by smoke stack emission, after two-stage preheats
Air is used as the combustion air of the first burner and the second burner.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910025023.0A CN109675921B (en) | 2019-01-11 | 2019-01-11 | Continuous organic contaminated soil direct thermal desorption system and thermal desorption method thereof |
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| CN201910025023.0A CN109675921B (en) | 2019-01-11 | 2019-01-11 | Continuous organic contaminated soil direct thermal desorption system and thermal desorption method thereof |
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| CN109675921B CN109675921B (en) | 2023-09-05 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112139231A (en) * | 2020-09-16 | 2020-12-29 | 山东大成环境修复有限公司 | System and method for low-temperature thermal desorption of volatile organic contaminated soil |
| CN114939597A (en) * | 2022-05-27 | 2022-08-26 | 江苏省环境科学研究院 | Skid-mounted rapid emergency soil thermal desorption device |
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