CN106424112A - Multi-stage thermal desorption technology and device for waste salt refining - Google Patents
Multi-stage thermal desorption technology and device for waste salt refining Download PDFInfo
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- CN106424112A CN106424112A CN201610953100.5A CN201610953100A CN106424112A CN 106424112 A CN106424112 A CN 106424112A CN 201610953100 A CN201610953100 A CN 201610953100A CN 106424112 A CN106424112 A CN 106424112A
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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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Abstract
The invention discloses a multi-stage thermal desorption device for waste salt refining. The multi-stage thermal desorption device comprises a first-stage hot air heating furnace, a first-stage rotary kiln, a second-stage hot air heating furnace, a second-stage rotary kiln, feeders and an induced draft fan, wherein a feeding hole and one of the feeders are arranged at the top of the first-stage rotary kiln; the bottom of the first-stage rotary kiln is connected on the feeder of the second-stage rotary kiln through a pipeline; a discharge hole is formed in the bottom of the second-stage rotary kiln; an air outlet of the second-stage hot air heating furnace is connected with the bottom of the second-stage rotary kiln; a pipeline connected with the top of the first-stage rotary kiln is arranged on an air inlet of the second-stage hot air heating furnace; an air outlet of the first-stage hot air heating furnace is connected with the bottom of the first-stage rotary kiln; and a pipeline and the induced draft fan which are connected with the top of the second-stage rotary kiln are arranged on an air inlet of the first-stage hot air heating furnace. The device and a technology provided by the invention are mainly used for refining of waste salt, the structure is simple, the thermal desorption efficiency of organic matters is high, gases generated by thermal desorption are circularly utilized, no tail gas is generated, atmospheric pollution is avoided, and economic benefits and environmental benefits are achieved.
Description
Technical field
The present invention relates to the danger abraum salt processing technology field that the industry such as agricultural chemicals, medicine, printing and dyeing produces, more particularly, to a kind of use
In the refined multistage thermal desorption processes of abraum salt and equipment.
Background technology
At present, the industry such as China's Coal Chemical Industry, agricultural chemicals, dyestuff produces substantial amounts of dirt salt, and annual output is in terms of million tons, and lacks
Few suitable process approach.Contain substantial amounts of poisonous and hazardous organic matter in these abraum salts, and carry penetrating odor, typically quilt
It is useless that local environmental administration regards as danger.National correlation department lists the danger abraum salt that pesticide industry produces in danger useless name at present
It is not necessary to identification is directly as dangerous solid waste in record.Because there is no clear and definite standard or guidance method, because its generation
Amount is big, species is many, complicated component, intractability are big, becomes industry the difficult problem of environmental protection urgently to be resolved hurrily, and present relevant enterprise adopts
Mode is to build storehouse to keep in, and " swell-warehouse " phenomenon in Some Enterprises.
In recent years, the problem of danger abraum salt also causes government and the highest attention of society.Agricultural chemicals by-product abraum salt is pesticide industry
The maximum solid waste of middle amount, containing various poisonous and harmful substances, complicated.Simultaneously because moisture is high, easily lump, difficult
To be effectively addressed and to utilize.Salt is a kind of important industrial chemicals, is also extremely valuable national strategy resource, reclaims profit
With agricultural chemicals by-product abraum salt as raw material of industry salt, the pollution to environment not only can be eliminated, preciousness can also be made full use of
Salt resource, by-product resource realizes recycling economy.
In terms of danger abraum salt process, conventional technology is incineration technology, that is, under the high temperature conditions, will be organic in danger abraum salt
Thing decomposes, gasifies, oxidation, and poisonous and harmful substance the most serious removes under the high temperature conditions.This is a kind of process danger abraum salt
A kind of relatively effective and more feasible technology, on market, existing processing method makes using the high-temperature process skill such as incinerator, rotary kiln
Art.But, these technology there is also a series of problem in actual application, is mainly manifested in the following aspects：
1) danger abraum salt is bonded on equipment inner wall, leads to equipment can not use.Danger abraum salt has certain moisture content in itself,
When entering incinerator, the equipment such as rotary kiln, in the presence of high temperature easy to stick on the inwall of equipment, and organic matter is decomposing
During complicated component, also can produce the sticking organic matter of tool during reaction, firmer viscous of danger abraum salt can be made
On equipment inner wall, labor cleaning cannot be carried out knot, ultimately causes device space deficiency, and equipment can not reuse, so that
Finally the falling into disuse of equipment；
2）Heating is uneven, and treatment effeciency is low.When recycling the equipment such as incinerator, rotary kiln to burn, these equipment are in heating
It is all by the way of local heating, through conduction of heat, all of danger abraum salt is heated to design temperature.Such plus
Hot mode can make the heating-up temperature of danger abraum salt uneven, causes local temperature too high or phenomenon that local temperature is too low, finally
Lead to the organic matter endangered in abraum salt to decompose not exclusively it is impossible to thoroughly decompose oxidation operation, cause treatment effect not good.
Patent CN201510063379.5 discloses a kind of organic polluted soil multistage thermal desorption repair system, and it is mainly adopted
Be two-stage thermal desorption process, thermal desorption process is carried out to the soil of organic contamination, but with reference to its technical scheme from the point of view of, its
Thermal desorption produces substantial amounts of organic exhaust gas, and these waste gas need to carry out vent gas treatment and waste heat application, and this needs to add at tail gas
Reason device and apparatus for reusing residual heat, production cost greatly increases, and the process conditions due to soil thermal desorption and abraum salt
There is certain difference in the process conditions of the thermal desorption of grain, during thermal desorption, if adopting organic exhaust gas circulating-heating
Mode, the organic exhaust gas of generation are likely to again adsorb in soil, cause secondary pollution, cause the net of final products soil
Change effect to be deteriorated.
Content of the invention
For above-mentioned problem, present invention aim at providing a kind of structure simple, organic matter thermal desorption efficiency high,
The gas that thermal desorption produces recycles, less energy consumption, equips and industry for the multistage thermal desorption that abraum salt refines.
In order to achieve the above object, the technical solution used in the present invention is as follows：A kind of Multi-stage heat refined for abraum salt takes off
Attaching is standby, described equipment include one-level hot-blast heater, one-level rotary kiln, two grades of hot-blast heaters, two grades of rotary kilns, feeder and
Air-introduced machine, the top of described one-level rotary kiln is provided with charge door and feeder, and the bottom of one-level rotary kiln is connected to two by pipeline
On the feeder of level rotary kiln, the bottom of two grades of rotary kilns is provided with discharging opening, and the gas outlet of two grades of described hot-blast heaters is connected to
The bottom of two grades of rotary kilns, the air inlet of two grades of hot-blast heaters is provided with the top that pipeline connects one-level rotary kiln, described one-level
The gas outlet of hot-blast heater is connected to the bottom of one-level rotary kiln, and the air inlet of one-level hot-blast heater is provided with pipeline and air inducing
Machine connects the top of two grades of rotary kilns.
Hot gas are equipped with the air inlet of one-level hot-blast heater of the present invention and two grades of hot-blast heaters even
Interface；Hot gas connector connects imflammable gas, is conveniently burnt in hot-blast heater, provides heat for gas.
The connecting tube of one-level rotary kiln of the present invention and two grades of hot-blast stoves is provided with gas evacuated tube and wet-emitting blower；Have
After the burning of machine thing, certain water can be produced, be discharged by gas evacuated tube and wet-emitting blower it is ensured that abraum salt particle in system
Stability.
A kind of multistage thermal desorption processes refining for abraum salt that the present invention provides, described technique comprises the steps：
1）Air is passed through one-level hot-blast stove, is heated to 100～200 DEG C, be passed through from the bottom of one-level rotary kiln；Danger abraum salt is carried out
Preliminary drying, to increase the mobility of salt.
2）By feeder, abraum salt particle is added from the top of one-level rotary kiln, abraum salt particle stops one in one-level rotary kiln
After the section time, reach the bottom of one-level rotary kiln, two grades of rotary kilns are entered by pipeline and feeder, the generation at one-level rotary kiln top
Air-flow is passed through in two grades of hot-blast heaters；During air heating, by waving of producing during thermal desorption in one-level rotary kiln
The property sent out organic exhaust gas, these waste gas are passed through oxidation in two grades of hot-blast heaters and burn, while a part of combustible material is provided,
And do not result in atmosphere pollution.
3）Two grades of hot-blast heaters, by Hot-blast Heating to 300～600 DEG C, are passed through from the bottom of two grades of rotary kilns：Two grades of rotary kilns
By the salt high-temperature oxydation thermal desorption again dried preliminary in one-level rotary kiln, fully the oxidation operation in danger abraum salt is decomposed, obtain
To the salt without organic matter.
4）Abraum salt particle entrapment for a period of time after, reach two grades of rotary kiln bottoms, discharged by discharging opening, two grades of rotary kiln tops
The air-flow producing is passed through in one-level hot-blast heater；The waste gas that thermal desorption in two grades of rotary kilns is produced carries out burning process, will not
Cause atmosphere pollution.
5）In the solid particle of two grades of rotary kiln bottom discharge mouth discharges, the concentration of organic matter is less than 10ppm；By obtain
Solid particle is tested and analyzed, and judges whether that arranging more than three-level and three-level turns according to the content of organic matter in the salt after processing
Kiln, the organic matter in salt after finally making process is less than the content of organics in chlor-alkali salt standard, and that is, organic concentration is less than
10ppm..
Step 5 of the present invention）Operating process in, when two grades of rotary kilns discharging opening discharge solid particle in organic
When the concentration of thing is more than 10ppm, need to set up three-level rotary kiln and three-level hot-blast heater in the lower section of two grades of rotary kilns.
One-level hot-blast heater of the present invention and two grades of hot-blast heaters are all heated using natural gas.
The preferred heating-up temperature of one-level hot-blast heater of the present invention is 150～200 DEG C；Two grades of hot-blast heaters are excellent
The heating-up temperature of choosing is 300～500 DEG C.
Step 2 of the present invention）During, abraum salt particle time of staying in one-level rotary kiln is 30～120min.
Step 4 of the present invention）During, abraum salt particle time of staying in two grades of rotary kilns is 60～120min.
It is an advantage of the current invention that：
1）Mode of heating using hot blast.In patent of the present invention, in the form of hot blast, thermal desorption is carried out to danger abraum salt first, and
And the formal layout using multistage thermal desorption.First, danger abraum salt is carried out one-level thermal desorption, mainly the moisture of danger abraum salt is gone
Remove, carry out preliminarily dried, increase the mobility of salt；Afterwards the salt after the process of one-level thermal desorption is carried out two grades of high temperature thermal desorptions,
Organic matter in danger abraum salt is thoroughly removed, decomposes, aoxidizes, realizes refined purpose.
2）Efficiently solve the problems, such as exhaust emission in danger abraum salt processing procedure.Danger abraum salt is in the process carrying out thermal desorption
In, the organic matter in danger abraum salt is removed in the way of volatile organic waste gas, can produce substantial amounts of waving therefore in processing procedure
The property sent out organic exhaust gas.In patent of the present invention, cleverly utilize the gas heating furnace in technique itself, during thermal desorption
The volatile organic waste gas burning producing is processed.This kind of technology one side saves emission-control equipment investment and operating cost；
Another aspect volatile organic waste gas can also provide certain calory burning as a kind of fuel as a kind of organic matter.Therefore,
Solve the problems, such as exhaust emission in technological process, design is ingenious, and novelty is notable.
3）High-temperature hot air forms convection current with danger abraum salt, increases the transmission effect of heat.In danger abraum salt thermal desorption is processed,
Using the mode of heating of hot blast, in heating process, hot blast forms Convection states with danger abraum salt, and such hot blast can be useless by danger
Space between salt, hot blast can be transferred heat to danger abraum salt by space, increases its heating surface area, increases the transmission effect of heat
Really.
4）Can be according to the concentration of organic matter in danger abraum salt, setting multistage rotary kiln superposition.In patent of the present invention, can to equipment
Flexibly adjusted.Can analyze after one-level rotary kiln, two grades of rotary kilns and measure the effect that danger abraum salt is processed, according in danger abraum salt
The index of organic matter has reached requirement, can increase or reduce the series of rotary kiln, saves energy on the premise of danger abraum salt is handled well
Source.
5）Can solve the problem that hardened problem.In present invention process, first carry out one-level thermal desorption, by the water in danger abraum salt
Divide and remove, the mobility of salt in this step, can be increased, reduce hardened problem and occur.In carrying out follow-up processing procedure,
Avoid hardened generation, the drawbacks of efficiently solve prior art.
Brief description
Fig. 1 is the structure diagram of assembly of the invention.
Wherein, 1 one-level rotary kiln, 2 two grades of rotary kilns, 3 one-level hot-blast heaters, 4 two grades of hot-blast heaters, 5,6 chargings
Device, 7 air-introduced machines, 8 wet-emitting blowers, 9 charging apertures, 10 discharge gates.
Specific embodiment
The present invention is described in further detail with specific embodiment for explanation below in conjunction with the accompanying drawings.
Embodiment 1：In experiment, refined danger abraum salt is derived from Shandong insecticide factory crystalline salt by evaporation, belongs to a kind of typical danger
Abraum salt.Wherein contain substantial amounts of agricultural chemicals organic matter, there is to environment very big danger.The thermal desorption handling process of danger abraum salt is main
It is to remove organic matter therein, therefore this experiment is concentrated mainly on the removal effect of organic matter in danger abraum salt.Its experimental procedure
And experiment effect is as shown in table 1.
Experimental procedure and experiment effect that table 1 danger abraum salt refines
Can be seen that initial organic concentrations in danger abraum salt by the experimental data in table 2 is 472mg/L.Process in one-level thermal desorption
In, the temperature of setting one-level thermal desorption is 150 degree, and the thermal desorption time is 30min, and in the salt obtaining, organic concentration is 158mg/
L, the clearance of organic matter is 66.5%；In two grades of thermal desorptions are processed, the temperature of two grades of thermal desorptions of setting is 350 degree, thermal desorption
Time is 90min, and in the salt obtaining, organic concentration is 13mg/L, and the clearance of organic matter has reached 97.2%, and the overwhelming majority has
Machine is removed, and in its salt, organic concentration reaches the standard of chlor-alkali salt.Through this handling process, obtain one ton refined after
Salt, cost is about 300 yuan.In whole technique, the waste gas producing in one-level rotary kiln and two grades of rotary kilns all burns in process
Process, both do not produced additional atmospheric processing cost, and also do not caused air environmental pollution.
Embodiment 2：In experiment, refined danger abraum salt is derived from Shandong insecticide factory crystalline salt by evaporation, belongs to a kind of typical danger
Abraum salt.Wherein contain substantial amounts of agricultural chemicals organic matter, there is to environment very big danger.The thermal desorption handling process of danger abraum salt is main
It is to remove organic matter therein, therefore this experiment is concentrated mainly on the removal effect of organic matter in danger abraum salt.Its experimental procedure
And experiment effect is as shown in table 2.
Experimental procedure and experiment effect that table 2 danger abraum salt refines
Can be seen that initial organic concentrations in danger abraum salt by the experimental data in table 2 is 472mg/L.Process in one-level thermal desorption
In, the temperature of setting one-level thermal desorption is 200 degree, and the thermal desorption time is 30min, and in the salt obtaining, organic concentration is 114mg/
L, the clearance of organic matter is 75.8%；In two grades of thermal desorptions are processed, the temperature of two grades of thermal desorptions of setting is 400 degree, thermal desorption
Time is 60min, and in the salt obtaining, organic concentration is 8mg/L, and the clearance of organic matter has reached 98.3%, and the overwhelming majority has
Machine is removed, and in its salt, organic concentration reaches the standard of chlor-alkali salt.Through this handling process, obtain one ton refined after
Salt, cost is about 300 yuan.In whole technique, the waste gas producing in one-level rotary kiln and two grades of rotary kilns all burns in process
Process, both do not produced additional atmospheric processing cost, and also do not caused air environmental pollution.
Embodiment 3：Refined danger abraum salt in experiment is derived from the danger abraum salt that Lianyun Harbour dyeing produces, and wherein contains big
The organic matter of amount, has very big danger to environment.Danger abraum salt using dyeing carries out Refining tests.Its experimental procedure and
Experiment effect is as shown in table 3.
Experimental procedure and experiment effect that table 3 danger abraum salt refines
Can be seen that initial organic concentrations in danger abraum salt by the experimental data in table 2 is 878mg/L.Process in one-level thermal desorption
In, the temperature of setting one-level thermal desorption is 200 degree, and the thermal desorption time is 40min, and in the salt obtaining, organic concentration is 345mg/
L, the clearance of organic matter is 60.7%；In two grades of thermal desorptions are processed, the temperature of two grades of thermal desorptions of setting is 500 degree, thermal desorption
Time is 90min, and in the salt obtaining, organic concentration is 6mg/L, and the clearance of organic matter has reached 99.3%, and the overwhelming majority has
Machine is removed, and in its salt, organic concentration reaches the standard of chlor-alkali salt.Through this handling process, obtain one ton refined after
Salt, cost is about 300 yuan.In whole technique, the waste gas producing in one-level rotary kiln and two grades of rotary kilns all burns in process
Process, both do not produced additional atmospheric processing cost, also do not cause air environmental pollution, economic benefit and environmental benefit double
Win.
Embodiment 4：In experiment, danger abraum salt is derived from the danger abraum salt that Lian Yuan Gang Liangang industrial park pharmaceuticals produces, wherein
Containing substantial amounts of macromolecule organic, and there is very high toxicity.Danger abraum salt using pharmaceuticals industry carries out Refining tests.In fact
Test step and experiment effect is as shown in table 4.
Experimental procedure and experiment effect that table 4 danger abraum salt refines
Can be seen that initial organic concentrations in danger abraum salt by the experimental data in table 4 is 1689mg/L.Process in one-level thermal desorption
In, the temperature of setting one-level thermal desorption is 150 degree, and the thermal desorption time is 30min, and in the salt obtaining, organic concentration is
1025mg/L, the clearance of organic matter is 39.3%；In two grades of thermal desorptions are processed, the temperature of two grades of thermal desorptions of setting is 350
Degree, the thermal desorption time is 90min, and in the salt obtaining, organic concentration is 256mg/L, and the clearance of organic matter has reached 84.8%；
Because content of organics is also higher in salt after two-stage thermal desorption, need to carry out third level thermal desorption, the temperature of setting three-level thermal desorption
Spend for 400 degree, the time of thermal desorption is 90min, in the salt obtaining, the concentration of organic matter is 4 mg/L, now most organic
It is removed, in its salt, organic concentration reaches the standard of chlor-alkali salt.Through this handling process, obtain one ton refined after salt,
Cost is about 350 yuan.In whole technique, the waste gas producing in one-level rotary kiln, two grades of rotary kilns, three-level rotary kiln is all in process
Burning is processed, and had not both produced additional atmospheric processing cost, and had not also caused air environmental pollution.
It should be noted that above-mentioned is only presently preferred embodiments of the present invention, not it is used for limiting the protection model of the present invention
Enclose, any combination made on the basis of above-described embodiment or equivalents belong to protection scope of the present invention.
Claims (9)
1. a kind of multistage thermal desorption equipment refining for abraum salt is it is characterised in that described equipment includes one-level Hot-blast Heating
Stove, one-level rotary kiln, two grades of hot-blast heaters, two grades of rotary kilns, feeder and air-introduced machine, the top of described one-level rotary kiln be provided with plus
Material mouth and feeder, the bottom of one-level rotary kiln is connected on the feeder of two grades of rotary kilns by pipeline, and the bottom of two grades of rotary kilns sets
There is a discharging opening, the gas outlet of two grades of described hot-blast heaters is connected to the bottom of two grades of rotary kilns, the entering of two grades of hot-blast heaters
Gas port is provided with the top that pipeline connects one-level rotary kiln, and the gas outlet of described one-level hot-blast heater is connected to one-level rotary kiln
Bottom, the air inlet of one-level hot-blast heater is provided with pipeline and air-introduced machine connects the top of two grades of rotary kilns.
2. it is used for the refined multistage thermal desorption of abraum salt as claimed in claim 1 and equip the one-level hot blast it is characterised in that described
Hot gas connector is equipped with the air inlet of heating furnace and two grades of hot-blast heaters.
3. it is used for the refined multistage thermal desorption of abraum salt as claimed in claim 1 and equip the one-level rotary kiln it is characterised in that described
It is provided with gas evacuated tube and wet-emitting blower with the connecting tube of two grades of hot-blast stoves.
4. a kind of multistage thermal desorption processes refining for abraum salt of equipping as claimed in claim 1 are it is characterised in that described
Technique comprises the steps：
1）Air is passed through one-level hot-blast stove, is heated to 100～200 DEG C, be passed through from the bottom of one-level rotary kiln；
2）By feeder, abraum salt particle is added from the top of one-level rotary kiln, when abraum salt particle stops one section in one-level rotary kiln
Between after, reach the bottom of one-level rotary kiln, two grades of rotary kilns, the air-flow of the generation at one-level rotary kiln top entered by pipeline and feeder
It is passed through in two grades of hot-blast heaters；
3）Two grades of hot-blast heaters, by Hot-blast Heating to 300～600 DEG C, are passed through from the bottom of two grades of rotary kilns：
4）Abraum salt particle entrapment for a period of time after, reach two grades of rotary kiln bottoms, discharged by discharging opening, two grades of rotary kiln tops produce
Air-flow be passed through in one-level hot-blast heater；
5）In the solid particle of two grades of rotary kiln bottom discharge mouth discharges, the concentration of organic matter is less than 10ppm.
5. it is used for as claimed in claim 4 multistage thermal desorption processes that abraum salt refines it is characterised in that described step 5）'s
In operating process, when the concentration of organic matter in the solid particle that the discharging opening of two grades of rotary kilns is discharged is more than 10ppm, need two
Three-level rotary kiln and three-level hot-blast heater are set up in the lower section of level rotary kiln.
6. it is used for as claimed in claim 4 multistage thermal desorption processes that abraum salt refines it is characterised in that described one-level hot blast
Heating furnace and two grades of hot-blast heaters are all heated using natural gas.
7. it is used for as claimed in claim 4 multistage thermal desorption processes that abraum salt refines it is characterised in that described one-level hot blast
The preferred heating-up temperature of heating furnace is 150～200 DEG C；The preferred heating-up temperature of two grades of hot-blast heaters is 300～500 DEG C.
8. it is used for as claimed in claim 4 multistage thermal desorption processes that abraum salt refines it is characterised in that described step 2）'s
During, abraum salt particle time of staying in one-level rotary kiln is 30～120min.
9. it is used for as claimed in claim 4 multistage thermal desorption processes that abraum salt refines it is characterised in that described step 4）'s
During, abraum salt particle time of staying in two grades of rotary kilns is 60～120min.
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| CN107128951A (en) * | 2017-06-22 | 2017-09-05 | 南京诚朴环保科技有限公司 | A kind of method of organic matter in removing inorganic salts |
| CN109940036A (en) * | 2017-12-20 | 2019-06-28 | 北京中毅工程科技有限公司 | Soil restoring device and method |
| CN113048489A (en) * | 2021-03-16 | 2021-06-29 | 上海蓄科环境工程有限公司 | Method and system for purifying and recycling industrial salt from waste salt containing organic matters |
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| CN106424112B (en) | 2019-12-31 |
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Application publication date: 20170222 Assignee: Yancheng Guotou Environmental Technology Co.,Ltd. Assignor: NANJING G+W ENVIRONMENT ENGINEERING Co.,Ltd. Contract record no.: X2021980001429 Denomination of invention: A multistage thermal desorption process and equipment for waste salt refining Granted publication date: 20191231 License type: Exclusive License Record date: 20210304 |