CN112404110A - Method and system for treating waste salt containing organic matters by adopting double-circulation thermal purification technology - Google Patents
Method and system for treating waste salt containing organic matters by adopting double-circulation thermal purification technology Download PDFInfo
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- CN112404110A CN112404110A CN202011377335.7A CN202011377335A CN112404110A CN 112404110 A CN112404110 A CN 112404110A CN 202011377335 A CN202011377335 A CN 202011377335A CN 112404110 A CN112404110 A CN 112404110A
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- flue gas
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- 150000003839 salts Chemical class 0.000 title claims abstract description 153
- 239000002699 waste material Substances 0.000 title claims abstract description 56
- 238000000746 purification Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000005516 engineering process Methods 0.000 title claims abstract description 25
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 107
- 239000003546 flue gas Substances 0.000 claims abstract description 107
- 239000002440 industrial waste Substances 0.000 claims abstract description 51
- 239000010815 organic waste Substances 0.000 claims abstract description 29
- 238000004064 recycling Methods 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims abstract description 4
- 238000002485 combustion reaction Methods 0.000 claims description 24
- 239000000428 dust Substances 0.000 claims description 22
- 239000005416 organic matter Substances 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 11
- 238000012545 processing Methods 0.000 claims description 10
- 239000000126 substance Substances 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 abstract description 6
- 239000012535 impurity Substances 0.000 abstract description 5
- 230000008018 melting Effects 0.000 abstract description 4
- 238000002844 melting Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 3
- 238000009270 solid waste treatment Methods 0.000 abstract description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 12
- 238000004140 cleaning Methods 0.000 description 9
- 239000007789 gas Substances 0.000 description 9
- 239000002894 chemical waste Substances 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- 238000004062 sedimentation Methods 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000010992 reflux Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004043 dyeing Methods 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000000575 pesticide Substances 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000009692 water atomization Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012847 fine chemical Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000002920 hazardous waste Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000004056 waste incineration Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/40—Destroying solid waste or transforming solid waste into something useful or harmless involving thermal treatment, e.g. evaporation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
-
- 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
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention provides a method for treating waste salt containing organic matters by adopting a double-circulation thermal purification technology, which relates to the technical field of solid waste treatment, and comprises the steps of feeding the organic matters waste salt into a thermal kiln through a feeding bin and then decomposing the organic matters waste salt into purified industrial waste salt and flue gas; the purified industrial waste salt enters the intermediate bin and then is divided into two paths, one path of the purified industrial waste salt enters the feeding bin through a frequency conversion backflow conveying system in a recycling mode, and the other path of the purified industrial waste salt is discharged outwards through the finished product bin; the flue gas is divided into two paths after being dedusted, combusted and purified, one path is circulated to the thermal kiln, and the other path is discharged outwards. The invention also provides a system adopting the method. The invention adopts a double-circulation mode to reduce the TOC content of the dried organic waste salt from 800ppm to 20000ppm to less than 100ppm so as to meet the requirements of further impurity removal and salt separation, realize the resource utilization of the waste salt, simultaneously purify the industrial waste salt for recycling, and overcome the phenomenon of melting and caking in the treatment process of the organic waste salt.
Description
Technical Field
The invention relates to the technical field of solid waste treatment, in particular to a method and a system for treating waste salt containing organic matters by adopting a double-circulation thermal purification technology.
Background
The production enterprises of the waste salt mainly comprise the key industries of the countries such as coal chemical industry, pesticide industry, pharmacy, fine chemical industry, printing and dyeing and the like. It is expected that the yield of the fourteen-five chemical waste salt will exceed 4000 ten thousand tons. Chemical waste salt is very serious in pollution, directly harms human health, destroys ecological environment, and can cause water quality deterioration of surface water and underground water, salinization of land and the like.
The waste salt has huge amount, limited market of regenerated products, low value of original salt and high purification cost, can enter a food chain to directly harm human health, and has great difficulty in harmless management. At present, the harmless management measures of the waste salt mainly comprise: emission reduction, production of chemical raw materials, sea discharge and landfill.
With the improvement of environmental protection requirements, the existing disposal means can not meet the requirements of harmless management of waste salt, and particularly for three industries of pesticide, medicine and printing and dyeing, the disposal of the waste salt becomes a bottleneck restricting the development of the industry.
Due to the characteristics of large waste salt production, difficult incineration, limited landfill and the like, the resource treatment of the waste salt is a feasible harmless management approach, however, at present, no mature chemical waste salt resource treatment technology exists at home and abroad, and the resource treatment of the waste salt relates to various key technologies such as organic matter removal, impurity removal, salt separation and the like, and needs further breakthrough.
The organic matter removal is taken as a key link in the resource utilization of the waste salt, how to reduce TOC (total organic carbon) in the waste salt to be below 100ppm is achieved, a good foundation is laid for the subsequent impurity removal and salt separation process, and meanwhile, the best energy practice is achieved through the application of a multi-energy channel, the waste salt and flue gas dual-cycle technology, the phenomenon of fusion and agglomeration in the waste salt treatment is avoided, so that the technical problem to be solved by technical personnel in the field is urgently solved.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a method for treating waste salt containing organic substances by using a dual-cycle thermal purification technology, so as to solve the technical problems in the prior art that the dried chemical waste salt cannot lay a good foundation for the subsequent impurity removal and salt separation processes because the TOC (total organic carbon) content of the dried chemical waste salt varies from 800ppm to 20000ppm, and that melting and agglomeration occur in the waste salt treatment.
The invention also aims to provide a system for treating waste salt containing organic matters by adopting a double-circulation thermal purification technology.
In order to achieve one of the above objects, the present invention provides a method for treating waste salt containing organic substances by using a double-circulation thermal purification technology, the method comprising:
organic waste salt enters the thermal kiln through a feeding bin and is decomposed into purified industrial waste salt and flue gas;
the purified industrial waste salt enters the intermediate bin and then is divided into two paths, one path of the purified industrial waste salt enters the feeding bin through a frequency conversion backflow conveying system in a recycling mode, is mixed with the untreated organic waste salt in the feeding bin and then enters the thermal kiln, and the other path of the purified industrial waste salt is discharged outwards through the finished product bin;
the flue gas is divided into two paths after being subjected to dust removal, combustion and purification, one path is circulated to the thermal kiln, and the other path is discharged outwards.
According to a preferred embodiment, the organic waste salt is pre-treated before entering the feeding bin, and then enters the thermal kiln through the feeding bin, stays in the thermal kiln for 30-120min, and the organic matters in the organic waste salt are thermally decomposed into the flue gas and the purified industrial waste salt.
According to a preferred embodiment, the thermal kiln adopts a rotary thermal kiln, the inclination angle is 2-5 degrees, and the thermal kiln rotates by 360 degrees.
According to a preferred embodiment, the thermal kiln is driven to rotate by a rotating motor, the frequency of the rotating motor is changed, and the residence time of the organic waste salt in the thermal kiln is adjusted.
According to a preferred embodiment, the temperature of the thermal kiln is adjustable within the range of 300 ℃ to 600 ℃, and the adjustment of the temperature can be realized by changing the power of the heating device of the thermal kiln, the combustion temperature of the flue gas and the flow rate of the circulating flue gas.
According to a preferred embodiment, the heating device is an electric heater or a burner.
According to a preferred embodiment, the circulating flue gas enters the kiln tail of the thermal kiln tangentially.
According to a preferred embodiment, the hood of the thermal kiln adopts a sedimentation structure to separate the purified industrial waste salt and the flue gas.
In order to achieve the second purpose, the invention provides a system for treating waste salt containing organic matters by adopting a double-circulation thermal purification technology, which comprises an organic matter waste salt treatment system and a flue gas treatment system, wherein:
the organic matter treatment system comprises a feeding bin, a thermal kiln for decomposing organic matter waste salt, an intermediate bin, a finished product bin and a backflow conveying system, wherein the feeding bin, the thermal kiln, the intermediate bin and the finished product bin are sequentially connected and communicated end to end, the thermal kiln decomposes the organic matter waste salt to form purified industrial waste salt and flue gas, the thermal kiln is simultaneously connected and communicated with the feeding bin through the backflow conveying system, the purified industrial waste salt flows back to the feeding bin through the backflow conveying system on one hand, and the purified industrial waste salt is discharged outwards through the finished product bin on the other hand;
the flue gas treatment system is connected and communicated with the thermal kiln, the flue gas is treated by the flue gas treatment system after being discharged from the thermal kiln, one path of flue gas is circulated to the thermal kiln, and the other path of flue gas is discharged outwards.
According to a preferred embodiment, the flue gas processing system includes dust remover, combustion chamber, gas cleaning device and circulating fan, the dust remover with the heating power kiln is connected and is communicate, the dust remover the combustion chamber the gas cleaning device and circulating fan is end to end in order, the flue gas is followed heating power kiln discharges and successively passes through the dust remover removes dust, the combustion chamber burning and the gas cleaning device purifies the back, circulate to the heating power kiln through circulating fan.
According to a preferred embodiment, still include draught fan and chimney, the draught fan simultaneously with the chimney with gas cleaning device connects, the draught fan is used for outwards discharging the process gas up to standard after gas cleaning device purifies.
According to a preferred embodiment, the flue gas purification device comprises a semidry quenching deacidification tower, an SNCR, a bag-type dust remover, a flue gas condenser and a flue gas heat exchanger.
According to a preferred embodiment, the heat kiln is arranged as a rotary kiln with an inclination angle of 2 ° to 5 °.
According to a preferred embodiment, a rotating motor is installed at the bottom of the heat kiln, the rotating motor is in driving connection with the heat kiln, and the frequency of the rotating motor is variable.
According to a preferred embodiment, the thermal kiln is equipped with electric heaters, which are divided into three independent loops for controlling the temperature of the thermal kiln.
According to a preferred embodiment, a burner is mounted on the thermal kiln, and the temperature of the thermal kiln is adjusted by controlling the power of the burner.
According to a preferred embodiment, a humidifying water atomization spray gun and a water flow control loop are arranged at the kiln head of the thermal kiln and used for controlling the water amount of the thermal kiln.
According to a preferred embodiment, a nitrogen nozzle and a nitrogen flow control loop are arranged at the kiln head of the thermal kiln and used for controlling the nitrogen flow of the thermal kiln.
According to a preferred embodiment, the kiln head cover of the thermal kiln is provided in a sedimentation structure.
The method for treating the waste salt containing the organic matters by adopting the double-circulation thermal purification technology has the following technical effects:
the method mainly comprises two circulating thermal purification technologies, wherein one of the two circulating thermal purification technologies is that purified industrial waste salt enters an intermediate bin, and then circularly enters a feeding bin through a variable-frequency backflow conveying system, is mixed with untreated organic waste salt in the feeding bin, and then enters a thermal kiln together, the other flue gas is divided into two paths after being subjected to dust removal, combustion and purification, the other path of the flue gas is recycled to the thermal kiln, and the other path of the flue gas is discharged outwards after reaching the standard.
The system for treating the waste salt containing the organic matters by adopting the double-circulation thermal purification technology has the following technical effects:
the system corresponds to the method, namely mainly comprises an organic waste salt treatment system and a flue gas treatment system, wherein the organic treatment system comprises a feeding bin, a thermal kiln for decomposing organic waste salt, an intermediate bin, a finished product bin and a backflow conveying system, the feeding bin, the thermal kiln, the intermediate bin and the finished product bin are sequentially connected and communicated end to end, the thermal kiln decomposes the organic waste salt to form purified industrial waste salt and flue gas, the thermal kiln is simultaneously connected and communicated with the feeding bin through the backflow conveying system to form a circulation, and the purified industrial waste salt flows back to the feeding bin through the backflow conveying system; and the other path of circulation is flue gas circulation, the flue gas treatment system is connected and communicated with the thermal kiln, and the flue gas is discharged from the thermal kiln, treated by the flue gas treatment system and returned to the thermal kiln. Adopt this kind of double circulation system can fall the TOC content of the organic matter waste salt after the mummification below 100ppm from 800ppm to 20000ppm to satisfy further edulcoration and divide the salt needs, realize waste salt resource utilization, purify industry waste salt recycling simultaneously, can also overcome the melting caking phenomenon that appears in the organic matter waste salt processing procedure.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow diagram of a system for processing waste salts containing organic materials using a dual cycle thermal purification technique in accordance with one embodiment of the present invention;
FIG. 2 is a schematic diagram of the construction of the thermal kiln of FIG. 1;
FIG. 3 is a cross-sectional view of the kiln tail of the thermal kiln of FIG. 2 taken along A-A;
wherein, fig. 1-3:
1. an organic waste salt treatment system; 101. a feeding bin; 102. a thermal kiln; 1021. a sedimentation structure; 1022. rotating the motor; 1023. an electric heater; 1024. a kiln tail; 103. a middle bin; 104. a finished product warehouse;
2. a flue gas treatment system; 201. a dust remover; 202. a combustion chamber; 203. a flue gas purification device; 204. a circulating fan; 205. an induced draft fan; 206. and (4) a chimney.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
The technical solution of the present invention is further illustrated by the following examples.
The invention provides a method for treating waste salt containing organic matters by adopting a double-circulation thermal purification technology, which comprises the following steps: organic waste salt enters the thermal kiln 102 through the feeding bin 101 and is decomposed into purified industrial waste salt and flue gas; purified industrial waste salt enters the intermediate bin 103 and then is divided into two paths, one path of the purified industrial waste salt enters the feeding bin 101 through a frequency conversion backflow conveying system in a recycling mode, is mixed with untreated organic waste salt in the feeding bin 101 and then enters the thermal kiln 102, and the other path of the purified industrial waste salt is discharged outwards through the finished product bin 104; the flue gas is divided into two paths after being dedusted, combusted and purified, one path is circulated to the thermal kiln 102, and the other path is discharged outwards.
The method can be used for harmless recycling treatment of chemical waste salt, the TOC content of the dried chemical waste salt is different from 800ppm to 20000ppm, after the chemical waste salt is treated by a dual-cycle thermal purification system, namely, organic waste salt is decomposed into purified industrial waste salt and flue gas in a thermal kiln 102, the purified industrial waste salt enters a middle bin 103 and then circularly enters a feeding bin 101 through a variable-frequency backflow conveying system to achieve the purpose of circular treatment, and the flue gas is dedusted, combusted and purified and then also circularly enters the thermal kiln 102, so that the TOC content in the waste salt is reduced to be below 100ppm, the requirements of further impurity removal and salt separation are met, and the recycling of the waste salt is realized.
Further, before entering the feeding bin 101, the organic waste salt is pretreated, then enters the thermal kiln 102 through the feeding bin 101, stays in the thermal kiln 102 for 30-120min, the organic matters in the organic waste salt are thermally decomposed into smoke and purified industrial waste salt, the purified industrial waste salt is discharged to the intermediate bin 103 through a kiln tail 1024 of the thermal kiln 102, and the smoke is subjected to dust removal, combustion and purification treatment.
Further, the thermal kiln 102 is a rotary thermal kiln 102, the inclination angle is 2-5 degrees, the thermal kiln 102360-degree autorotation is realized, specifically, the rotary kiln is in driving connection with a rotary motor 1022, the rotary motor 1022 is used for driving rotation, the frequency of the rotary motor 1022 is changed, and the residence time of the organic waste salt in the thermal kiln 102 can be adjusted, namely, the residence time in the thermal kiln 102 is 30-120 min.
Further, the temperature of the thermal kiln 102 can be adjusted within the range of 300 ℃ to 600 ℃, and the temperature can be adjusted by changing the power of the heating device of the thermal kiln 102, the combustion temperature of the flue gas and the flow rate of the circulating flue gas.
It should be noted that the heating device of the present invention may be an electric heater 1023, a burner, or other types of heating devices, and the present invention is not limited thereto, as long as the heating function of the heat kiln can be realized.
Further, the circulating flue gas enters the kiln tail 1024 of the thermal kiln 102 tangentially, that is, specifically, the circulating flue gas enters tangentially from the kiln tail 1024270 degrees of the thermal kiln 102, as shown in fig. 2-3, the flue gas rotates to the front in the thermal kiln 102, so that the contact area between the flue gas and the organic waste salt at the bottom of the thermal kiln 102 is increased, and the effect of full contact is achieved.
Further, a kiln head cover of the thermal kiln 102 adopts a sedimentation type structure 1021 to separate and purify the industrial waste salt and the flue gas, so that the separation of the purified industrial waste salt and the flue gas is realized, and the quantity of the purified industrial waste salt carried by the flue gas and entering the combustion chamber 202 is reduced.
Another embodiment of the present invention provides a system for processing waste salt containing organic substances by using a dual-cycle thermal purification technology, as shown in fig. 1-3, comprising an organic waste salt processing system 1 and a flue gas processing system 2, wherein the organic processing system comprises a feeding bin 101, a thermal kiln 102 for decomposing organic waste salt, an intermediate bin 103, a finished product bin 104 and a reflux conveying system, the feeding bin 101, the thermal kiln 102, the intermediate bin 103 and the finished product bin 104 are sequentially connected and communicated end to end, the thermal kiln 102 decomposes organic waste salt to form industrial waste salt and flue gas, the thermal kiln 102 is simultaneously connected and communicated with the feeding bin 101 through the reflux conveying system, one path of the purified industrial waste salt flows back to the feeding bin 101 through the reflux conveying system, and the other path of the purified industrial waste salt is discharged outside through the finished product bin 104; the flue gas treatment system 2 is connected and communicated with the thermal kiln 102, the flue gas is discharged from the thermal kiln 102 and then treated by the flue gas treatment system 2, one path of flue gas is circulated to the thermal kiln 102, and the other path of flue gas is discharged outwards.
The system of the embodiment corresponds to the method of the embodiment, namely, the system mainly comprises an organic waste salt treatment system 1 and a flue gas treatment system 2, wherein the organic treatment system comprises a feeding bin 101, a thermal kiln 102 for decomposing organic waste salt, an intermediate bin 103, a finished product bin 104 and a backflow conveying system, the feeding bin 101, the thermal kiln 102, the intermediate bin 103 and the finished product bin 104 are sequentially connected end to end and communicated, the thermal kiln 102 decomposes organic waste salt to form purified industrial waste salt and flue gas, the thermal kiln 102 is simultaneously connected and communicated with the feeding bin 101 through the backflow conveying system to form a circulation, and the purified industrial waste salt flows back to the feeding bin 101 through the backflow conveying system; and the other path of circulation is flue gas circulation, the flue gas treatment system 2 is connected and communicated with the thermal kiln 102, and the flue gas is discharged from the thermal kiln 102, treated by the flue gas treatment system 2 and returned to the thermal kiln 102 for circulation. Adopt this kind of double circulation system can fall the TOC content of the organic matter waste salt after the mummification below 100ppm from 800ppm to 20000ppm to satisfy further edulcoration and divide the salt needs, realize waste salt resource utilization, purify the industry waste salt simultaneously and in the circulation, can also overcome the melting caking phenomenon that appears in the organic matter waste salt processing procedure.
Purified industrial waste salt enters the intermediate bin 103 after passing through the tail 1024 of the thermal kiln 102, the purified industrial waste salt of the intermediate bin 103 is connected with the feeding bin 101 through a variable-frequency backflow conveying system, and the purified industrial waste salt can circularly enter the feeding bin 101 through the backflow conveying system and is mixed with untreated industrial waste salt in the feeding bin 101 to enter the thermal kiln 102 together. The amount of the recycled industrial waste salt can be adjusted by changing the frequency of the backflow conveying system.
By means of the mixing of purified industrial waste salt and unpurified industrial waste salt, the following effects can be achieved:
a. the adhesion and blockage phenomena of the industrial waste salt in the feeding bin 101 can be reduced;
b. the caking phenomenon of the industrial waste salt in the thermal kiln 102 is reduced;
c. the heat transfer process is enhanced, and a part of heat is recovered.
Further, the flue gas treatment system 2 comprises a dust remover 201, a combustion chamber 202, a flue gas purification device 203 and a circulating fan 204, wherein the dust remover 201 is connected and communicated with the thermal kiln 102, the dust remover 201, the combustion chamber 202, the flue gas purification device 203 and the circulating fan 204 are sequentially connected end to end, flue gas is discharged from the thermal kiln 102 and then dedusted by the dust remover 201, and the flue gas is circulated to the thermal kiln 102 through the circulating fan 204 after being combusted in the combustion chamber 202 and purified by the flue gas purification device 203.
Still include draught fan 205 and chimney 206, draught fan 205 is connected with chimney 206 and gas cleaning device 203 simultaneously, and draught fan 205 is used for outwards discharging the flue gas up to standard after gas cleaning device 203 purifies.
Specifically, the flue gas from the thermal kiln 102 enters a dust collector 201 to separate out salts possibly carried in the flue gas.
It should be noted that the combustion chamber 202 of the present invention is a sedimentation type combustion chamber, the flue gas from the dust remover 201 enters the combustion chamber 202, the temperature is raised to 1100 ℃, and the flue gas stays for 2s in the temperature range of 1100 ℃, so as to ensure that the gas compound generated by pyrolysis in the thermal kiln 102 is completely decomposed in a harmless manner; the combustion chamber 202 is heated by natural gas, the combustion temperature is controlled by adjusting the flow of natural gas, and the oxygen content in the flue gas is controlled by adjusting the fresh air quantity.
The flue gas generated by the combustion chamber 202 enters the flue gas cleaning device 203, and the flue gas cleaning device 203 comprises: after heat exchange of the semidry quenching deacidification tower, the SNCR, the bag-type dust collector 201, the flue gas condenser and the flue gas heat exchanger, the temperature of flue gas entering the induced draft fan 205 or the circulating fan 204 is 200 ℃, namely the flue gas after the flue gas purification device 203 is divided into two paths, one path of flue gas enters the thermal kiln 102 through the circulating fan 204 to realize the recirculation of the flue gas, the other path of flue gas is discharged outwards through the induced draft fan 205 and the chimney 206 after reaching the standard, and the discharge index of the flue gas discharged through the chimney 206 meets the requirements of GB18484 hazardous waste incineration pollution control standard.
Wherein, the condenser can reduce the water vapor content in the circulating flue gas.
Further, an electric heater 1023 is installed on the thermal kiln 102, and the electric heater 1023 is divided into three independent loops as shown in fig. 2, and is used for controlling the temperature of the thermal kiln 102, that is, the temperature is controlled by the three independent loops respectively, and the temperature control precision is ± 5 ℃.
Furthermore, a humidifying water atomization spray gun and a water flow control loop are arranged at the kiln head of the thermal kiln 102 and used for controlling the water quantity of the thermal kiln 102 according to the removal effect of the organic matters in the actual organic matter waste salt.
Further, a nitrogen nozzle and a nitrogen flow control loop are arranged at the kiln head of the thermal kiln 102, and are used for controlling the nitrogen amount of the thermal kiln 102 according to the actual organic matter removal effect in the organic matter waste salt.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A method for treating waste salt containing organic substances by using a double-circulation thermal purification technology, which is characterized by comprising the following steps:
organic waste salt enters the thermal kiln through a feeding bin and is decomposed into purified industrial waste salt and flue gas;
the purified industrial waste salt enters the intermediate bin and then is divided into two paths, one path of the purified industrial waste salt enters the feeding bin through a frequency conversion backflow conveying system in a recycling mode, is mixed with the untreated organic waste salt in the feeding bin and then enters the thermal kiln, and the other path of the purified industrial waste salt is discharged outwards through the finished product bin;
the flue gas is divided into two paths after being subjected to dust removal, combustion and purification, one path is circulated to the thermal kiln, and the other path is discharged outwards.
2. The method of claim 1, wherein the organic waste salt is pre-treated before entering the feeding bin, and then enters the thermal kiln through the feeding bin, and stays in the thermal kiln for 30-120min, and the organic matters in the organic waste salt are thermally decomposed into the flue gas and the purified industrial waste salt.
3. The method for treating waste salt containing organic substances by adopting the double-circulation thermal purification technology as claimed in claim 2, wherein the thermal kiln adopts a rotary thermal kiln, the inclination angle is 2-5 degrees, and the thermal kiln rotates by 360 degrees.
4. The method for treating waste salt containing organic substances by adopting the double-circulation thermal purification technology as claimed in claim 3, wherein the thermal kiln is driven to rotate by a rotating motor, the frequency of the rotating motor is changed, and the residence time of the waste salt containing organic substances in the thermal kiln is adjusted.
5. The method for treating waste salt containing organic substances by adopting the double-circulation thermal purification technology as claimed in claim 3, wherein the temperature of the thermal kiln is adjustable within the range of 300-600 ℃, and the temperature can be adjusted by changing the power of a heating device of the thermal kiln, the combustion temperature of the flue gas and the flow rate of the circulating flue gas.
6. The method for treating waste salt containing organic matters by adopting the double-circulation thermal purification technology as claimed in claim 5, wherein the circulating flue gas enters the kiln tail of the thermal kiln tangentially.
7. The method of claim 1, wherein the hood of said thermal kiln is a settling structure to separate said purified industrial waste salt from said flue gas.
8. The utility model provides an adopt two circulation heating power purification technology to handle system that contains organic matter waste salt which characterized in that, includes organic matter waste salt processing system and flue gas processing system, wherein:
the organic matter treatment system comprises a feeding bin, a thermal kiln for decomposing organic matter waste salt, an intermediate bin, a finished product bin and a backflow conveying system, wherein the feeding bin, the thermal kiln, the intermediate bin and the finished product bin are sequentially connected and communicated end to end, the thermal kiln decomposes the organic matter waste salt to form purified industrial waste salt and flue gas, the thermal kiln is simultaneously connected and communicated with the feeding bin through the backflow conveying system, the purified industrial waste salt flows back to the feeding bin through the backflow conveying system on one hand, and the purified industrial waste salt is discharged outwards through the finished product bin on the other hand;
the flue gas treatment system is connected and communicated with the thermal kiln, and after the flue gas is discharged from the thermal kiln and treated by the flue gas treatment system, one path of the flue gas is circulated to the thermal kiln, and the other path of the flue gas is discharged outwards.
9. The system for treating waste salt containing organic matters by adopting the dual-cycle thermal purification technology as claimed in claim 8, wherein the flue gas treatment system comprises a dust remover, a combustion chamber, a flue gas purification device and a circulating fan, the dust remover is connected and communicated with the thermal kiln, the dust remover, the combustion chamber, the flue gas purification device and the circulating fan are sequentially connected end to end, the flue gas is discharged from the thermal kiln and sequentially dedusted by the dust remover, and the flue gas is combusted in the combustion chamber and purified by the flue gas purification device and then is circulated to the thermal kiln by the circulating fan.
10. The system for treating waste salt containing organic matters by adopting the double-circulation thermal purification technology as claimed in claim 9, further comprising an induced draft fan and a chimney, wherein the induced draft fan is simultaneously connected with the chimney and the flue gas purification device, and the induced draft fan is used for outwards discharging the standard-reaching flue gas purified by the flue gas purification device.
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| AUPN644895A0 (en) * | 1995-11-08 | 1995-11-30 | Miltox Holdings Pte Ltd | Method and apparatus for waste treatment |
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