CN102489500B - Low-temperature vibration thermal desorption device for contaminated soil and low-temperature vibration thermal desorption method for contaminated soil - Google Patents

Low-temperature vibration thermal desorption device for contaminated soil and low-temperature vibration thermal desorption method for contaminated soil Download PDF

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Publication number
CN102489500B
CN102489500B CN 201110418855 CN201110418855A CN102489500B CN 102489500 B CN102489500 B CN 102489500B CN 201110418855 CN201110418855 CN 201110418855 CN 201110418855 A CN201110418855 A CN 201110418855A CN 102489500 B CN102489500 B CN 102489500B
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China
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contaminated soil
vibrated bed
air
burner
bed
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CN 201110418855
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Chinese (zh)
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CN102489500A (en
Inventor
唐先进
杨尚源
刘磊
沈超峰
陈英旭
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浙江大学
杭州高博环保科技有限公司
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Publication of CN102489500A publication Critical patent/CN102489500A/en
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Abstract

The invention discloses a low-temperature vibration thermal desorption device for contaminated soil and a low-temperature vibration thermal desorption method for the contaminated soil. The contaminated soil enters a vibration bed through a spiral conveying pipe, is propelled from a feeding port to a discharging port in a vibrating manner and is heated by hot air during propelling so that the temperature of the contaminated soil gradually rises. When the contaminated soil is positioned in the front of the vibration bed, a large amount of water and parts of volatile/semi-volatile organic pollutants in the contaminated soil volatilize, and are discharged from the front of the vibration bed into the atmosphere sequentially after the tertiary treatment of cyclone dust removal, bag dust removal and water-curtain dust removal and organic pollutant removal. When the contaminated soil reaches the rear of the vibration bed, residual water and a large number of volatile/semi-volatile organic pollutants in the contaminated soil volatilize, are discharged from the rear of the vibration bed, are led into a combustor after cyclone dust removal and bag dust removal and are decomposed at a high temperature in the combustor. When reaching the tail of the vibration bed, the contaminated soil is discharged from the discharging port of the vibration bed after being cooled by cold air. The low-temperature vibration thermal desorption method is applied to treating the contaminated soil, so that purifying effect can reach 80%-90%.

Description

Contaminated soil low temperature vibration thermal desorption treating apparatus and method

Technical field

The present invention relates to environmental protection technical field, relate in particular to a kind of contaminated soil low temperature vibration thermal desorption treating apparatus and method.

Background technology

Along with " move back two and advance three " implementation in China's city layout transformation, the quickening day by day of urbanization process, nearly all big and medium-sized cities, the whole nation are being faced with closing down in batch and the resettlement problem of the polluted enterprises such as agricultural chemicals, chemical industry, petrochemical industry, the a large amount of contaminated site soil that emerge in large numbers are demanded urgently disposing, wherein take agricultural chemicals, chemical industry, petrochemical industry retired place as the volatility/half volatile organic polluted soil problems such as benzene homologues, chloro organic solvent and petroleum hydrocarbon of representative particularly outstanding.Because its complicated component, potential danger are large, masses' sensitiveness is high, and the reparation of such contaminated site soil is subject to extensive concern.Volatility/half volatile organic polluted soil has become the main restricting factor of the retired Site development recycling of part, and how it being repaired has effectively and rapidly become the technical barrier of needing solution badly

Volatility and semi-volatile organic matter contaminated soil are administered improvement technique outside the venue and the device thereof that technique and device (ZL200410056888.7) have been announced a kind of volatility/semi-volatile organic matter contaminated soil outside the venue, and this device is imbedded in the soil cylinder by pump-drainage well, temperature-control senser and heater and formed.This patent uses the method for vacuum extraction to carry out the processing of volatility/semi-volatile organic matter contaminated soil, and treating capacity is smaller, and heating-up temperature is low, processes the pollutant scope of application less, is difficult to satisfy the extensive reparation of contaminated site contaminated soil.

Soil pollution thermal desorption restoration processing system (200910030305.6) has been announced a kind of soil pollution thermal desorption restoration processing system, and this system is by feed system, heat source system and composition of the control system.This patent is mainly carried out repair process by the thermal desorption method to volatility/semi-volatile organic matter contaminated soil, the clean-up effect of processing the contaminated soil of major pollutants volatility/semi-volatile organic matter can only reach 70%-80%, and tail gas needs to process in addition, has increased processing cost.

The pertinent literature retrieval shows there is no the document of discovery and similar structures treating apparatus of the present invention in present patent application a few days ago.

Summary of the invention

Purpose of the present invention be exactly slow for existing treating apparatus desorption rate for the treatment of volatility/half volatile organic contaminant in soil, disposal ability is low, poor processing effect, deficiency that cost of disposal is high, a kind of contaminated soil low temperature vibration thermal desorption treating apparatus and method are provided, carry out the extensive repair process of contaminated site contaminated soil.

the objective of the invention is to be achieved through the following technical solutions: a kind of contaminated soil low temperature vibration thermal desorption treating apparatus, it comprises: feed bin, spiral conveying pipeline, burner, the first air blast, filter, vibrated bed, vibrating motor, the second air blast, the first cyclone separator, the first cloth bag, the first air-introduced machine, temperature sensor, water curtain sprinkling system, the second cyclone separator, the second cloth bag, the second air-introduced machine and self-control box etc., wherein, described feed bin is connected with the charging aperture of vibrated bed by the spiral conveying pipeline, filter is connected with the first air blast, the second air-introduced machine all is connected with the import of burner with the first air blast, the outlet of burner is connected with the hot blast import of vibrated bed, vibrating motor is connected with vibrated bed, temperature sensor is fixed in vibrated bed, the second air blast is connected with the cold wind import of vibrated bed afterbody, the first air outlet of vibrated bed front portion is connected with the first cyclone separator, the first cyclone separator, the first cloth bag, the first air-introduced machine is connected successively with the water curtain sprinkling system, second air outlet at vibrated bed rear portion is connected with the second cyclone separator, the second cyclone separator, the second cloth bag is connected successively with the second air-introduced machine, self-control box is connected with spiral conveying pipeline, burner, vibrating motor and temperature sensor by data wire respectively.

A kind of contaminated soil low temperature vibration thermal desorption processing method of using said apparatus, the method comprises the following steps:

(1) air by after filter, passes into burner by the first air blast, and working media (as diesel oil, gasoline or natural gas) produces hot blast in the burner internal combustion.

(2) hot blast of step 1 generation enters vibrated bed by the hot blast import, contaminated soil in feed bin enters vibrated bed through the spiral conveying pipeline from charging aperture, vibrating motor drives the vibrated bed vibration, contaminated soil is advanced to the discharging opening vibration by charging aperture in vibrated bed, in progradation, by Hot-blast Heating, temperature raises gradually.

(3) contaminated soil is when vibrated bed is anterior, and temperature is lower, and the volatility/half volatile organic contaminant in a large amount of moisture and part contaminated soil evaporates, from the first air outlet discharge of vibrated bed front portion; The mist of discharging is successively through the first cyclone separator cyclone dust removal, the first cloth bag bag-type dust and the water curtain dedusting of water curtain sprinkling system, remove this tertiary treatment of organic pollution after, enter in atmosphere.

When (4) contaminated soil arrives the vibrated bed rear portion, temperature is higher, in contaminated soil, remaining moisture and a large amount of volatility/half volatile organic contaminant evaporate, the second air outlet discharge from the vibrated bed rear portion, the mist of discharging is after the second cyclone separator cyclone dust removal and the second cloth bag bag-type dust, pass into burner by the second air-introduced machine, the pyrolytic in burner of the organic pollution in mist.

When (5) contaminated soil arrives the vibrated bed afterbody, after the cold wind that is blasted by the second air blast that is connected with the cold wind import of vibrated bed afterbody is cooling, by the discharging opening discharge of vibrated bed.

The invention has the beneficial effects as follows:

1, the temperature of vibrated bed bed body is in 100-300 ℃ of scope, so the temperature of working environment is lower.

2, the exhaust collection that contains high concentration organic contaminant enters the combustion chambers burn coexistence and puts, and combustion chamber internal combustion temperature reaches 900 ℃-1000 ℃, can effectively reduce the generation of bioxin.

3, the present invention adopts the technique that vibration combines with the Low Temperature Thermal desorb, can effectively shorten the contaminated soil processing time, improves the organic matter clean-up effect.

4, compare with external like product, equipment cost is only its 1/3-1/2.

5, design philosophy of the present invention has comprised the pollution Whole Process Control, strictly controls the secondary pollution problem that may bring in the contaminated soil processing procedure.

6, the present invention adopts self-control box as automatic control system, and is easy and simple to handle.

7, to process major pollutants be that the clean-up effect of the contaminated soil of volatility/semi-volatile organic matter can reach 80%-90% in the present invention.

Description of drawings

Fig. 1 is the structural representation of contaminated soil low temperature vibration thermal desorption treating apparatus;

In figure, feed bin 1, spiral conveying pipeline 2, burner 3, the first air blast 4, filter 5, vibrated bed 6, vibrating motor 7, the second air blast 8, the first cyclone separator 9, the first cloth bag 10, the first air-introduced machine 11, temperature sensor 12, water curtain sprinkling system 13, the second cyclone separator 14, the second cloth bag 15, the second air-introduced machine 16, self-control box 17.

The specific embodiment

Contaminated soil low temperature of the present invention vibration thermal desorption treating apparatus comprises: feed bin 1, spiral conveying pipeline 2, burner 3, the first air blast 4, filter 5, vibrated bed 6, vibrating motor 7, the second air blast 8, the first cyclone separator 9, the first cloth bag 10, the first air-introduced machine 11, temperature sensor 12, water curtain sprinkling system 13, the second cyclone separator 14, the second cloth bag 15, the second air-introduced machine 16, self-control box 17.wherein, feed bin 1 is connected with the charging aperture of vibrated bed 6 by spiral conveying pipeline 2, filter 5 is connected with the first air blast 4, the second air-introduced machine 16 all is connected with the import of burner 3 with the first air blast 4, the outlet of burner 3 is connected with the hot blast import of vibrated bed 6, vibrating motor 7 is connected with vibrated bed 6, temperature sensor 12 is fixed in vibrated bed 6, the second air blast 8 is connected with the cold wind import of vibrated bed 6 afterbodys, the first air outlet of vibrated bed 6 front portions is connected with the first cyclone separator 9, the first cyclone separator 9, the first cloth bag 10, the first air-introduced machine 11 is connected successively with water curtain sprinkling system 13, second air outlet at vibrated bed 6 rear portions is connected with the second cyclone separator 14, the second cyclone separator 14, the second cloth bag 15 is connected successively with the second air-introduced machine 16.Self-control box 17 is connected with spiral conveying pipeline 2, burner 3, vibrating motor 7 and temperature sensor 12 by data wire respectively, thus the temperature that the frequency of the power of the transfer rate by controlling spiral conveying pipeline 2, burner 3 and vibrating motor 7 is regulated vibrated bed 6 inside.

Self-control box 17 can be realized by single-chip microcomputer or computer.

Contaminated soil low temperature vibration thermal desorption processing method of the present invention comprises the following steps:

1, air by after filter 5, passes into burner 3 by the first air blast 4, and working media (as diesel oil, gasoline or natural gas) produces hot blast in burner 3 internal combustion.

2, the hot blast of step 1 generation enters vibrated bed 6 by the hot blast import, contaminated soil in feed bin 1 enters vibrated bed 6 through spiral conveying pipeline 2 from charging aperture, vibrating motor 7 drives vibrated bed 6 vibrations, contaminated soil is advanced to the discharging opening vibration by charging aperture in vibrated bed 6, in progradation, by Hot-blast Heating, temperature raises gradually.

3, contaminated soil is when vibrated bed 6 is anterior, and temperature is lower, and the volatility/half volatile organic contaminant in a large amount of moisture and part contaminated soil evaporates, from the first air outlet discharge of vibrated bed 6 front portions; The mist of discharging is successively through the first cyclone separator 9 cyclone dust removals, the first cloth bag 10 bag-type dusts and the 13 water curtain dedustings of water curtain sprinkling system, remove this tertiary treatment of organic pollution after, enter in atmosphere.

When 4, contaminated soil arrives vibrated bed 6 rear portion, temperature is higher, in contaminated soil, remaining moisture and a large amount of volatility/half volatile organic contaminant evaporate, the second air outlet discharge from vibrated bed 6 rear portions, the mist of discharging is after the second cyclone separator 14 cyclone dust removals and the second cloth bag 15 bag-type dusts, pass into burner 3 by the second air-introduced machine 16, the pyrolytic in burner of the organic pollution in mist.

When 5, contaminated soil arrives vibrated bed 6 afterbody, after the cold wind that the second air blast 8 that is connected by the cold wind import with vibrated bed 6 afterbodys blasts is cooling, discharged by the discharging opening of vibrated bed 6.

Use the present invention and process contaminated soil, treatment effeciency reaches 80%-90%, higher than the treatment effeciency of existing equipment; And tail gas is after dust removal process, enters burner 3 pyrolytics or enter water curtain sprinkling system 13 to carry out the water curtain dedusting, remove organic pollution, non-secondary pollution.

The below further describes the present invention according to embodiment, and effect of the present invention will be reflected more clearly.

Embodiment 1

The contaminated soil of certain contaminated site, its major pollutants are volatility/semi-volatile organic matter, as benzene,toluene,xylene in benzene homologues etc.Contaminated soil take this contaminated site further illustrates the device of patent of the present invention as concrete case study on implementation.

Contaminated soil is after broken pretreatment, and then particle diameter enters spiral conveying pipeline 2 through feed bin 1 and carry less than 1cm, enters vibrated bed 6 by vibrated bed 6 charging apertures.

Burner 3 is comprised of burner and combustion chamber, and wherein the burner power output is 118-328kw, and the combustion chamber is connected on burner, Q235 steel matter, in ward off refractory material.The power of motor of air blast 4 is 0.37kw, and air quantity is 480 m 3/ h.Filter 5 is selected the mesh number as required.Working media (as diesel oil, gasoline or natural gas) is after burner 3 is lighted, out the common combustion heating of the gas that contains the high density pollution thing in the air that passes into air blast 4 in the combustion chamber and the second air-introduced machine 16, be transported to vibrated bed 6 by the hot blast import again, the opening degree of the unlatching of burner 3 and valve group is controlled by self-control box 17, and the hot air temperature in the combustion chamber also shows in self-control box 17.

Vibrated bed 6 is rectangular build equipment, has good sealing property, and is parallel to the ground, is connected with the cement pedestal by the vibration isolation spring.On 6 bodies of vibrated bed, charging aperture, discharging opening, hot blast import, cold wind import, the first gas outlet and the second gas outlet are arranged, charging aperture is connected with spiral conveying pipeline 2.Contaminated soil enters 6 bodies of vibrated bed from charging aperture, hot-air enters from the hot blast import simultaneously, both fully contacts in the bed body, make volatility in contaminated soil/half volatile organic contaminant volatilization separate, the tail gas that contains low concentration pollutant and a large amount of steam, enters water curtain sprinkling system 13 and processes up to standard rear emptying successively through the first cyclone separator 9 and the first cloth bag 10 from the first gas outlet; The tail gas that contains high density pollution thing and a small amount of steam is got back to burner 3 through the second cyclone separator 14, the second cloth bag 15 and the second air-introduced machine 16 successively from the second gas outlet, and the clean soil after thermal desorption is discharged from discharging opening.Cold air enters vibrated bed 6 by air blast 8 by the cold wind import, regulates the soil bed temperature.Vibrating motor 7 is arranged on vibrated bed 6 outsides, regulates Oscillation Amplitude and the frequency of 6 bodies of vibrated bed.Vibrating motor 7 is connected with self-control box 17, and the temperature of soil bed also shows at self-control box 17.

The first cyclone separator 9 and the second cyclone separator 14 are Q235 steel matter, process air quantity 3000-5000 m 3/ h, the first cloth bag 10 and the second cloth bag 15 adopt general waterproof and oilproof material, and the air quantity of the first air-introduced machine 11 and the second air-introduced machine 16 is 3000-5000 m 3/ h, blast 1300Pa, water curtain sprinkling system 13 power are 20-30kw.Water in water curtain sprinkling system 13 is promoted by its water circulating pump that carries and circulates.

The integrated automatic control of spiral conveying pipeline 2, burner 3 and vibrating motor 7 in self-control box 17, and the temperature monitoring of burner 3 and vibrated bed 6.

Treating capacity is 0.2t-0.5t/h, and the operating temperature of burner is 900 ℃-1000 ℃, and in vibrated bed, the soil bed temperature is 100 ℃-300 ℃.Treatment effeciency reaches 80%-90%.

Above-described embodiment is used for the present invention that explains, rather than limits the invention, and in the protection domain of spirit of the present invention and claim, any modification and change to the present invention makes all fall into protection scope of the present invention.

Claims (2)

1. a contaminated soil low temperature vibrates the thermal desorption treating apparatus, it is characterized in that, it comprises: feed bin (1), spiral conveying pipeline (2), burner (3), the first air blast (4), filter (5), vibrated bed (6), vibrating motor (7), the second air blast (8), the first cyclone separator (9), the first cloth bag (10), the first air-introduced machine (11), temperature sensor (12), water curtain sprinkling system (13), the second cyclone separator (14), the second cloth bag (15), the second air-introduced machine (16) and self-control box (17), wherein, described feed bin (1) is connected with the charging aperture of vibrated bed (6) by spiral conveying pipeline (2), filter (5) is connected with the first air blast (4), the second air-introduced machine (16) all is connected with the import of burner (3) with the first air blast (4), the outlet of burner (3) is connected with the hot blast import of vibrated bed (6), vibrating motor (7) is connected with vibrated bed (6), temperature sensor (12) is fixed in vibrated bed (6), the second air blast (8) is connected with the cold wind import of vibrated bed (6) afterbody, the first anterior air outlet of vibrated bed (6) is connected with the first cyclone separator (9), the first cyclone separator (9), the first cloth bag (10), the first air-introduced machine (11) is connected successively with water curtain sprinkling system (13), second air outlet at vibrated bed (6) rear portion is connected with the second cyclone separator (14), the second cyclone separator (14), the second cloth bag (15) is connected successively with the second air-introduced machine (16), self-control box (17) is connected with spiral conveying pipeline (2), burner (3), vibrating motor (7) and temperature sensor (12) by data wire respectively.
2. an application rights requires the contaminated soil low temperature of 1 described device to vibrate the thermal desorption processing method, it is characterized in that, the method comprises the following steps:
(1) air by after filter (5), passes into burner (3) by the first air blast (4), and working media produces hot blast in burner (3) internal combustion, and described working media is diesel oil, gasoline or natural gas;
(2) hot blast of step 1 generation enters vibrated bed (6) by the hot blast import, contaminated soil in feed bin (1) enters vibrated bed (6) through spiral conveying pipeline (2) from charging aperture, vibrating motor (7) drives vibrated bed (6) vibration, contaminated soil is advanced to the discharging opening vibration by charging aperture in vibrated bed (6), in progradation, by Hot-blast Heating, temperature raises gradually;
(3) contaminated soil is when vibrated bed (6) is anterior, and temperature is lower, and the volatility/half volatile organic contaminant in a large amount of moisture and part contaminated soil evaporates, and discharges from the first air outlet that vibrated bed (6) is anterior; The mist of discharging, enters in atmosphere after the first cloth bag (10) bag-type dust and water curtain sprinkling system (13) water curtain dedusting, this tertiary treatment of removal organic pollution successively through the first cyclone separator (9) cyclone dust removal;
When (4) contaminated soil arrives vibrated bed (6) rear portion, temperature is higher, in contaminated soil, remaining moisture and a large amount of volatility/half volatile organic contaminant evaporate, the second air outlet discharge from vibrated bed (6) rear portion, the mist of discharging is after (14) cyclone dust removal of the second cyclone separator and the second cloth bag (15) bag-type dust, pass into burner (3) by the second air-introduced machine (16), the pyrolytic in burner of the organic pollution in mist;
When (5) contaminated soil arrives vibrated bed (6) afterbody, after the cold wind that the second air blast (8) that is connected by the cold wind import with vibrated bed (6) afterbody blasts is cooling, discharged by the discharging opening of vibrated bed (6).
CN 201110418855 2011-12-15 2011-12-15 Low-temperature vibration thermal desorption device for contaminated soil and low-temperature vibration thermal desorption method for contaminated soil CN102489500B (en)

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CN103962374A (en) * 2013-11-01 2014-08-06 中科华南(厦门)环保有限公司 Environment-friendly and energy-saving thermal-desorption remediation treatment system for organic contaminated soil
CN104324936B (en) * 2014-10-24 2016-04-13 北京建筑材料科学研究总院有限公司 A kind of swinging Polluted Soil Thermal desorption experimental provision and experimental technique
CN104496136B (en) * 2014-12-19 2017-01-11 辽宁华孚环境工程股份有限公司 Indirect heating and thermal desorption treatment device and method for oily solid waste
CN104776231A (en) * 2015-04-21 2015-07-15 云南中翼鼎东能源科技开发有限公司 Safety valve applicable to controlling high temperature flue gas
CN105080958B (en) * 2015-10-10 2018-02-16 中石化炼化工程(集团)股份有限公司 A kind of organic polluted soil classification thermal desorption repair system and technique
CN105710123B (en) * 2016-02-04 2018-08-28 博川环境修复(北京)有限公司 A kind of method of volatile organic matter and the improvement of mercury combined contamination soil
CN106799393B (en) * 2017-01-20 2018-03-02 中国地质科学院矿产资源研究所 A kind of low temperature desorption apparatus

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