CN104511239A - Method for improving washing effect of ammonium phosphate granulation tail gas - Google Patents
Method for improving washing effect of ammonium phosphate granulation tail gas Download PDFInfo
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- CN104511239A CN104511239A CN201310694140.9A CN201310694140A CN104511239A CN 104511239 A CN104511239 A CN 104511239A CN 201310694140 A CN201310694140 A CN 201310694140A CN 104511239 A CN104511239 A CN 104511239A
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Abstract
The invention discloses a method for improving the washing effect of ammonium phosphate granulation tail gas. The method comprises the following steps: the granulation tail gas sequentially flows through a Venturi pre-stage washer, a Venturi washer and a horizontal washer and is washed by a washing liquid from the front chamber of a cycle tank in a cycle manner, the washed tail gas flows through a condenser to remove water, the water removed tail gas flows through a demister and undergoes solid-liquid separation, and the obtained tail gas is discharged to the atmosphere through a chimney; most of the washing liquid in the front chamber of the cycle tank enters the rear chamber of the cycle tank, and is mixed with the washing liquid overflowing from the front chamber of the cycle tank, and the obtained washing liquid mixture is sent to an ammonia tube reactor to participate in a reaction; concentrated phosphoric acid is added to the Venturi washer; and diluted phosphoric acid is introduced into the front chamber of the cycle tank. The method can solve the problems of low ammonia absorption and poor washing effect of present methods.
Description
Technical field
The present invention relates to chemical fertilizer processing technique field, especially a kind of process improving the clean result of phosphorus ammonium tail gas generated by granulation.
Background technology
In ammonium phosphate production process, containing ammonia, granule dust in the tail gas that granulation, drying process produce, could discharge after need reclaiming it.Washing tail gas of monoammonium phosphate device equipment utilizes phosphoric acid liquid to carry out circulation cleaning to granulation, dried tail gas, reclaims ammonia, dust in tail gas.In single hose reaction process flow process, whole washing system design is upper adopts low degree of neutralization (N/P is 0.5) washing.Its washing flow is: tail gas generated by granulation flows through Venturi scrubber, horizontal washer successively, after the cleaning solution circulation cleaning through coming from circulating slot cup, then flowing through condenser removing moisture, entering air through chimney.The cleaning solution of cup is for be made into whole phosphoric acid,diluted, small part concentrated acid and geosyncline water, and most of SPA does not participate in washing tail gas, mainly enters room after circulating slot, and from the cleaning solution mixing that cup overflow is come, sends to the reaction of ammonia pipe reactor.
But in actual production; because the ammonia of overflowing in comminutor is larger; cleaning solution degree of neutralization is caused to raise (degree of neutralization is increased to 1.3 ~ 1.4); cleaning solution thickness, poor fluidity, clean result declines, and ammonia absorptivity declines; because degree of neutralization is high; the easy crystallization of acid elution slip, washing pipeline easily blocks, and affects device and normally runs.In addition, because phosphorus ore quality also constantly declines in recent years, magnesium content constantly raises, and also causes pickle to become sticky thick, exacerbates the decline of clean result further, and monoammonium phosphate device is become worse and worse the adaptability that phosphorus ore changes.Therefore, vent gas washing system is transformed, run significant to raising ammonia recovery, stabilising arrangement.
Summary of the invention
Problem to be solved by this invention is to provide a kind of process improving phosphorus ammonium tail gas generated by granulation clean result, low to solve existing technique ammonia absorptivity, the problem of clean result difference.
In order to solve the problem, technical scheme of the present invention is: the process of this raising phosphorus ammonium tail gas generated by granulation clean result comprises the steps: that tail gas generated by granulation flows through Venturi scrubber successively, horizontal washer, after cleaning solution circulation cleaning through coming from the cup of circulating slot, flow through condenser removing moisture again, enter air through chimney; Major part in the cleaning solution of described circulating slot cup enters the rear room of described circulating slot, mixes with the cleaning solution of coming from the overflow of described circulating slot cup, sends into the reaction of ammonia pipe reactor;
Described tail gas generated by granulation before described Venturi scrubber first through venturi prime washer; Described Venturi scrubber adds SPA and washs described tail gas generated by granulation; Phosphoric acid,diluted is passed at the cup of described circulating slot.
In technique scheme, can also be more specifically: described tail gas generated by granulation carried out gas-liquid separation through demister after entering described condenser removing moisture again, then entered air through described chimney.
Owing to have employed technique scheme, the present invention compared with prior art has following beneficial effect:
1, this method increased prime washer before Venturi scrubber, making tail gas generated by granulation through first entering Venturi scrubber again after absorption portion ammonia, reducing the degree of neutralization of cleaning solution, improve ammonia absorbability;
2, this method adopts phosphoric acid,diluted to enter circulating slot cup, prime washer, Venturi scrubber, horizontal washer, dry scrubbing tower is sent into respectively by circulation cleaning pump, tail gas is washed step by step, the cleaning solution of prime washer, horizontal washer, dry scrubbing tower flows back to circulating slot cup, and the flow of liquor of Venturi scrubber gets back to room after circulating slot;
3, this method is washed after absorption portion ammonia through cleaning solution at tail gas generated by granulation, and circulating slot cup washing acid proportion is minimized, and reduces cleaning solution viscosity, improves good fluidity, reduces the blocking of pipeline, shower nozzle, makes production system more stable;
4, this method adds SPA and washs tail gas in Venturi scrubber, cleaning solution flows back to room after circulating slot, after wherein a part mixes with the cleaning solution of coming from circulating slot cup, Venturi scrubber is delivered to again with circulating pump, tail gas is washed, cleaning solution flows back to room after circulating slot, and a part, as phosphorus ammonium raw materials for production, delivers to the reaction of ammonia pipe reactor;
5, this method increases demister, and tail gas generated by granulation by demister, carries out gas-liquid separation after washing;
In sum, this method achieves the multistage washing of phosphorus ammonium tail gas, greatly improves clean result, and ammonia recovery rises to more than 98% by original 95%, makes the tail gas ammonia content qualified discharge of two ammonium devices; Also improve the adaptability of monoammonium phosphate device to high content of magnesium phosphorus ore.
Accompanying drawing explanation
Fig. 1 is the process principle figure of the embodiment of the present invention;
1-prime washer is labeled as, 2-Venturi scrubber, the horizontal washer of 3-, 4-demister, 5-circulating slot cup, 6-cup circulating pump, room after 7-circulating slot, 8-shurry pump in figure.
Detailed description of the invention
Below in conjunction with accompanying drawing, the embodiment of the present invention is described in further detail:
The washing tail gas of monoammonium phosphate device technique of this method as shown in Figure 1, this flow process can be divided into exhaust gas flow path and cleaning solution flow process.
Exhaust gas flow path comprises the following steps: tail gas generated by granulation enters prime washer 1, flows through Venturi scrubber 2, horizontal washer 3, after washing step by step, enters demister 4, goes condensation, enter exhaust emissions house steward, enter air finally by chimney.
The tail gas drying scrubbing tower of drying machine, enters exhaust emissions house steward, enters air finally by chimney after cleaning dust.
Cleaning solution flow process comprises the following steps: phosphoric acid,diluted is passed into circulating slot cup 5, prime washer 1, Venturi scrubber 2, horizontal washer 3, dry scrubbing tower is sent into respectively by cup circulating pump 6, the cleaning solution of prime washer 1, horizontal washer 3, dry scrubbing tower flows back to circulating slot cup 5 through return duct, and the cleaning solution of Venturi scrubber 2 then flows back to room 7 after circulating slot.
SPA is introduced into Venturi scrubber 2, cleaning solution after washing tail gas flows back to room 7 after circulating slot, and after a part mixes with the cleaning solution of coming from circulating slot cup 5, a part delivers to Venturi scrubber 2 with shurry pump 8 again, wash tail gas, cleaning solution flows back to room 7 after circulating slot.A part, as phosphorus ammonium raw materials for production, delivers to the reaction of ammonia pipe reactor.
Claims (2)
1. one kind is improved the process of phosphorus ammonium tail gas generated by granulation clean result, comprise the steps: that tail gas generated by granulation flows through Venturi scrubber successively, horizontal washer, after the cleaning solution circulation cleaning through coming from the cup of circulating slot, flow through condenser removing moisture again, enter air through chimney; Major part in the cleaning solution of described circulating slot cup enters the rear room of described circulating slot, mixes with the cleaning solution of coming from the overflow of described circulating slot cup, sends into the reaction of ammonia pipe reactor; It is characterized in that:
Described tail gas generated by granulation before described Venturi scrubber first through venturi prime washer; Described Venturi scrubber adds SPA and washs described tail gas generated by granulation;
Phosphoric acid,diluted is passed at the cup of described circulating slot.
2. the process of raising phosphorus ammonium tail gas generated by granulation clean result according to claim 1, is characterized in that: described tail gas generated by granulation carried out gas-liquid separation through demister after entering described condenser removing moisture again, then entered air through described chimney.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310694140.9A CN104511239A (en) | 2013-12-18 | 2013-12-18 | Method for improving washing effect of ammonium phosphate granulation tail gas |
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| CN201310694140.9A CN104511239A (en) | 2013-12-18 | 2013-12-18 | Method for improving washing effect of ammonium phosphate granulation tail gas |
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| CN104511239A true CN104511239A (en) | 2015-04-15 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110562944A (en) * | 2019-09-10 | 2019-12-13 | 湖北祥云(集团)化工股份有限公司 | Diammonium production system and method with high ammonia utilization rate and low ammonia emission |
| CN112933826A (en) * | 2021-01-28 | 2021-06-11 | 云南中正化学工业有限公司 | Tail gas recycling method for compound fertilizer production |
| CN113274833A (en) * | 2021-04-18 | 2021-08-20 | 呼伦贝尔东北阜丰生物科技有限公司 | Flue gas treatment and waste heat recovery process |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1226544A (en) * | 1999-01-15 | 1999-08-25 | 铜陵化学工业集团公司磷铵厂 | Method and apparatus for producing diammonium phosphate with external circulation ammoniation reactor |
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2013
- 2013-12-18 CN CN201310694140.9A patent/CN104511239A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1226544A (en) * | 1999-01-15 | 1999-08-25 | 铜陵化学工业集团公司磷铵厂 | Method and apparatus for producing diammonium phosphate with external circulation ammoniation reactor |
Non-Patent Citations (1)
| Title |
|---|
| 张伟等主编: "《磷肥生产工》", 31 May 2005, 化学工业出版社 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110562944A (en) * | 2019-09-10 | 2019-12-13 | 湖北祥云(集团)化工股份有限公司 | Diammonium production system and method with high ammonia utilization rate and low ammonia emission |
| CN110562944B (en) * | 2019-09-10 | 2023-05-12 | 湖北祥云(集团)化工股份有限公司 | High-ammonia-utilization-rate low-ammonia-emission-amount diammonium production system and production method |
| CN112933826A (en) * | 2021-01-28 | 2021-06-11 | 云南中正化学工业有限公司 | Tail gas recycling method for compound fertilizer production |
| CN113274833A (en) * | 2021-04-18 | 2021-08-20 | 呼伦贝尔东北阜丰生物科技有限公司 | Flue gas treatment and waste heat recovery process |
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Application publication date: 20150415 |