CN103613264A - Ammonia II mud drying treatment process - Google Patents
Ammonia II mud drying treatment process Download PDFInfo
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- CN103613264A CN103613264A CN201310614367.8A CN201310614367A CN103613264A CN 103613264 A CN103613264 A CN 103613264A CN 201310614367 A CN201310614367 A CN 201310614367A CN 103613264 A CN103613264 A CN 103613264A
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Abstract
The invention relates to an ammonia II mud drying treatment process. The process is used for treating wet ammonia II mud with the moisture content of 25-40% and comprises the following steps of (1) blowing high-temperature gas of 120-260 DEG C into a dryer by adopting a coal-fired boiler; (2) feeding the wet ammonia II mud into the dryer through a feeder, mechanically crushing the wet ammonia II mud in the dryer, and evaporating and drying moisture in the mechanically crushed wet ammonia II mud; (3) carrying ammonia II mud granules dried in the step (2) out of the dryer through gas flow of the high-temperature gas, and enabling the dried ammonia II mud granules to enter a drying tower, so as to be subjected to secondary drying; (4) bringing the ammonia II mud granules subjected to secondary drying into a dry ammonia II mud collector together with high-temperature gas, discharging dry ammonia II mud through a discharging machine, collecting the dry ammonia II mud, meanwhile, feeding wet gas in the collector into a flue, and discharging after the wet gas is subjected to standard reaching treatment. The process is mainly used for solving the problems in the prior art that the ammonia II mud (AII mud) can only be treated by adopting a burying method and the functions of all composition ingredients in the ammonia II mud (AII mud) can not be comprehensively utilized.
Description
Technical field
The invention belongs to the treatment process field that produces the waste residue producing in soda ash process in alkaline industry, relate to a kind of ammonia II mud dry treatment process.
Background technology
At connection alkali, produce in soda ash/ammonium chloride process, by mother liquor II(, be called for short MII) inhale ammonia mother liquor ammonia concentration is increased, prepare qualified ammonia mother liquor II(and be called for short AII) to meet the required ammonia of carbonization, receive ratio, simultaneously because part calcium magnesium addition in mother liquor is further removed in the increase of pH value.Throw out is exhausted from system after AII settling tank precipitation, is ammonia II mud (AII mud).This AII mud volume solid content is in 20% left and right, and liquid phase main component is ammonia, and solid phase mainly contains the materials such as calcium carbonate and magnesium carbonate, and the two ton of every alkali product approximately discharges AII mud 0.04-0.05m
3.
In the past, for the processing of AII mud, be all to adopt landfill method, but along with the increasing of the turnout of soda ash, the output of AII mud is also increasing.Adopt landfill method can not process the AII mud producing in soda ash production process completely, and after AII mud is landfilled, the advantage that respectively forms component of this AII mud just can not be utilized.
Therefore, how addressing the above problem, is the content that those skilled in the art will study.
Summary of the invention
The invention provides a kind of ammonia II mud dry treatment process, its object is mainly to solve the problem that original ammonia II mud (AII mud) can only adopt landfill method to process and can not fully utilize the function of each moiety in ammonia II mud (AII mud).
For achieving the above object, the technical solution used in the present invention is: a kind of ammonia II mud dry treatment process, carries out the processing of following steps to water content at 25% ~ 40% wet ammonia II mud:
Step 1: adopt coal firing boiler to being blown into the high-temperature gas of 120 ~ 260 ° in described drying machine;
Step 2: will wet ammonia II mud in feeding machine is sent into drying machine; Wet ammonia II mud in drying machine by Mechanical Crushing; By the moisture in the wet ammonia II mud after Mechanical Crushing, be evaporated, be dried;
Step 3: take described drying machine through the dried ammonia II of step 2 mud particle out of through the air-flow of high-temperature gas and enter drying tower, carry out redrying;
Step 4: the ammonia II mud particle after redrying is brought in dry ammonia II mud collector with high temperature gas flow, dry ammonia II mud is discharged and is collected through material discharging machine; Meanwhile, the humid gas in collector is sent into flue and is discharged after processing up to standard.
Related content in technique scheme is explained as follows:
1,, in such scheme, described kiln bottom is provided with dry whipping appts.
2,, in such scheme, described high-temperature gas is the waste gas that coal firing boiler produces.
3,, in such scheme, the inlet temperature of described drying machine is 150 ~ 240 °; The temperature out of described drying machine is 100 ~ 240 °.
4,, in such scheme, the internal temperature of described drying tower is 80 ~ 240 °.
5,, in such scheme, the intake pressure of described drying machine is-2000 ~-1000Pa; The top hole pressure of described drying machine is-7500 ~-5000Pa.
6,, in such scheme, the top hole pressure of described dry ammonia II mud collector is-8500 ~-6000Pa.
7, in such scheme, in the exit of described dry ammonia II mud collector, be provided with drying air fan, the top hole pressure of described drying air fan is-2000 ~-1000Pa.
The principle of technique of the present invention: by the high-temperature flue gas of 120 ~ 260 ° by tangentially sending in drying machine after pressurizeing; wet ammonia II mud is in feeding machine is sent drying machine to; clash into mutually with the high-temperature gas of the high temperature and high speed rotation tangentially entering; the dry whipping appts that wet ammonia II mud is installed in drying machine bottom carries out Mechanical Crushing; make it micronize and be fierce spouted fluidized state; two-phase very large due to specific surface area and that carry out between gas-solid is conducted heat, and the moisture content in wet ammonia II mud is by evaporation rapidly, dry.The dry ammonia II mud particle that reaches certain mass dryness fraction is taken out of drying machine by air-flow and is entered drying tower and carry out redrying, completes dried dry ammonia II mud particle and carries and enter in dry ammonia II mud collector with air-flow.Leave the humid gas of collector, then send into flue and mix rear qualified discharge with other flue gas.
Because technique scheme is used, the present invention compared with prior art has following advantages:
Because the present invention carries out drying treatment to wet ammonia II mud, its dried ammonia II mud can be used as circulating fluidized bed boiler fuel and mixes burning, economic benefit and social benefit doulbe-sides' victory.And the waste gas just producing with coal firing boiler, as thermal source, reaches the object of " waste recycling ", does not need to consume expensive fuel cost, and processing cost is low.By adopting Mechanical Crushing dry technology to carry out fragmentation to wet ammonia II mud, can adapt to the combination treatment of the ammonia II mud of different humidity, do not lump, do not harden, adaptability is good.In addition, high-temperature flue gas and ammonia II mud 100% transmission of heat by contact, mummification efficiency is high, and thermo-efficiency is high, than common drying drum, will exceed 2 ~ 3 times.And in whole treatment process, equipment used all adopts the airtight operation of negative pressure, and is furnished with pressure relief device, safe and reliable.
Accompanying drawing explanation
Accompanying drawing 1 is processing technological flow schematic diagram of the present invention.
In above accompanying drawing: 1, wet ammonia II mud; 2, feeding machine; 3, material discharging machine; 4, drying air fan; 5, boiler induced-draft fan.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described:
Embodiment:
As shown in Figure 1, a kind of ammonia II mud dry treatment process, carries out the processing of following steps to water content at 25% ~ 40% wet ammonia II mud 1:
Step 1: adopt coal firing boiler to being blown into the high-temperature gas of 120 ~ 260 ° in described drying machine;
Step 2: the ammonia II mud 1 that will wet is sent in drying machine through feeding machine 2; Wet ammonia II mud 1 in drying machine by Mechanical Crushing; By the moisture in the wet ammonia II mud 1 after Mechanical Crushing, be evaporated, be dried;
Step 3: take described drying machine through the dried ammonia II of step 2 mud particle out of through the air-flow of high-temperature gas and enter drying tower, carry out redrying;
Step 4: the ammonia II mud particle after redrying is brought in dry ammonia II mud collector with high temperature gas flow, dry ammonia II mud is discharged and is collected through material discharging machine 3; Meanwhile, the humid gas in collector is sent into flue through boiler induced-draft fan 5 and is discharged after processing up to standard.
Described kiln bottom is provided with dry whipping appts (not shown).Described high-temperature gas is the waste gas that coal firing boiler produces.
The inlet temperature of described drying machine is 150 ~ 240 °; The temperature out of described drying machine is 100 ~ 240 °.The internal temperature of described drying tower is 80 ~ 240 °.
The intake pressure of described drying machine is-2000 ~-1000Pa; The top hole pressure of described drying machine is-7500 ~-5000Pa.The top hole pressure of described dry ammonia II mud collector is-8500 ~-6000Pa.Exit at described dry ammonia II mud collector is provided with drying air fan 4, and the top hole pressure of described drying air fan 4 is-2000 ~-1000Pa.In 4 pairs of drying towers of drying air fan, vacuumize processing.
The principle of technique of the present invention: by the high-temperature flue gas of 120 ~ 260 ° by tangentially sending in drying machine after pressurizeing; wet ammonia II mud is in feeding machine is sent drying machine to; clash into mutually with the high-temperature gas of the high temperature and high speed rotation tangentially entering; the dry whipping appts that wet ammonia II mud is installed in drying machine bottom carries out Mechanical Crushing; make it micronize and be fierce spouted fluidized state; two-phase very large due to specific surface area and that carry out between gas-solid is conducted heat, and the moisture content in wet ammonia II mud is by evaporation rapidly, dry.The dry ammonia II mud particle that reaches certain mass dryness fraction is taken out of drying machine by air-flow and is entered drying tower and carry out redrying, completes dried dry ammonia II mud particle and carries and enter in dry ammonia II mud collector with air-flow.Leave the humid gas of collector, then send into flue and mix rear qualified discharge with other flue gas.
Dried ammonia II mud is dust-like, and dry ammonia II mud and flying dust are sent into circulating fluidized bed boiler again and burned, and in the dry slag obtaining, contain calcium oxide and magnesium oxide etc. after burning, can be used for the additive in cement mill, make silicate cement.Meanwhile, the ammonia that is generation in burning can be used for the desulfurizer of boiler.Thereby each component that makes ammonia II mud is decomposed after drying treatment carrying out, and is fully utilized, and does not need landfill again, having reduced landfill needs floor space compared with large and be difficult to find the problem of disposal site, has met environmental requirement.And, ammonia II mud mummification and dry ammonia II mud burn combine than but ammonia II mud to burn one-time investment few, processing cost is low, the mummification of ammonia II mud can make ammonia II mud moisture control 10% ~ 30%, the volume and weight that has reduced ammonia II mud, has reduced transport charge and landfill expense.
Whole ammonia II mud treatment system mainly contains fluidized-bed ammonia II mud desiccation apparatus, the compositions such as fluidized-bed ammonia II mud incinerator and smoke eliminator.The ammonia II mud waste gas of incineration of ammonia II mud mummification institute heat requirement after by mummification provides, and without auxiliary fuel, system can realize heat self-balancing.Innoxious and the minimizing from ammonia II mud, burning scheme has obvious advantage.After burning, a small amount of plaster can be used for the aggregate of concrete, brick and tile product, subgrade and pavement and the backfill soil of engineering construction.
Above-described embodiment is only explanation technical conceive of the present invention and feature, and its object is to allow person skilled in the art can understand content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences that spirit is done according to the present invention change or modify, within all should being encompassed in protection scope of the present invention.
Claims (8)
1. an ammonia II mud dry treatment process, is characterized in that: water content is carried out to the processing of following steps at 25% ~ 40% wet ammonia II mud:
Step 1: adopt coal firing boiler to being blown into the high-temperature gas of 120 ~ 260 ° in described drying machine;
Step 2: will wet ammonia II mud in feeding machine is sent into drying machine; Wet ammonia II mud in drying machine by Mechanical Crushing; By the moisture in the wet ammonia II mud after Mechanical Crushing, be evaporated, be dried;
Step 3: take described drying machine through the dried ammonia II of step 2 mud particle out of through the air-flow of high-temperature gas and enter drying tower, carry out redrying;
Step 4: the ammonia II mud particle after redrying is brought in dry ammonia II mud collector with high temperature gas flow, dry ammonia II mud is discharged and is collected through material discharging machine; Meanwhile, the humid gas in collector is sent into flue and is discharged after processing up to standard.
2. ammonia II mud dry treatment process according to claim 1, is characterized in that: described kiln bottom is provided with dry whipping appts.
3. ammonia II mud dry treatment process according to claim 1, is characterized in that: described high-temperature gas is the waste gas that coal firing boiler produces.
4. ammonia II mud dry treatment process according to claim 1, is characterized in that: the inlet temperature of described drying machine is 150 ~ 240 °; The temperature out of described drying machine is 100 ~ 240 °.
5. ammonia II mud dry treatment process according to claim 1, is characterized in that: the internal temperature of described drying tower is 80 ~ 240 °.
6. ammonia II mud dry treatment process according to claim 1, is characterized in that: the intake pressure of described drying machine is-2000 ~-1000Pa; The top hole pressure of described drying machine is-7500 ~-5000Pa.
7. ammonia II mud dry treatment process according to claim 1, is characterized in that: the top hole pressure of described dry ammonia II mud collector is-8500 ~-6000Pa.
8. ammonia II mud dry treatment process according to claim 1, is characterized in that: the exit at described dry ammonia II mud collector is provided with drying air fan, and the top hole pressure of described drying air fan is-2000 ~-1000Pa.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310614367.8A CN103613264A (en) | 2013-11-28 | 2013-11-28 | Ammonia II mud drying treatment process |
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| CN201310614367.8A CN103613264A (en) | 2013-11-28 | 2013-11-28 | Ammonia II mud drying treatment process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103880261A (en) * | 2014-03-18 | 2014-06-25 | 嘉兴绿方舟环保技术有限公司 | Circulating fluid bed air-drying system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1248483A (en) * | 1999-10-14 | 2000-03-29 | 王晋宁 | Flue gas desulfurizing agent and method |
| CN101492233A (en) * | 2009-02-26 | 2009-07-29 | 大连理工大学 | Drying plant for high-moisture percentage plaster pasty materials |
-
2013
- 2013-11-28 CN CN201310614367.8A patent/CN103613264A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1248483A (en) * | 1999-10-14 | 2000-03-29 | 王晋宁 | Flue gas desulfurizing agent and method |
| CN101492233A (en) * | 2009-02-26 | 2009-07-29 | 大连理工大学 | Drying plant for high-moisture percentage plaster pasty materials |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103880261A (en) * | 2014-03-18 | 2014-06-25 | 嘉兴绿方舟环保技术有限公司 | Circulating fluid bed air-drying system |
| CN103880261B (en) * | 2014-03-18 | 2015-11-18 | 嘉兴绿方舟环保技术有限公司 | A kind of circulating fluidized bed air drying system |
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Application publication date: 20140305 |