CN101745293B - Novel method for washing tail gas of monoammonium phosphate device - Google Patents
Novel method for washing tail gas of monoammonium phosphate device Download PDFInfo
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- CN101745293B CN101745293B CN2009102443361A CN200910244336A CN101745293B CN 101745293 B CN101745293 B CN 101745293B CN 2009102443361 A CN2009102443361 A CN 2009102443361A CN 200910244336 A CN200910244336 A CN 200910244336A CN 101745293 B CN101745293 B CN 101745293B
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- tail gas
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- phosphoric acid
- cleaning solution
- fluoride
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Abstract
The invention discloses a method for washing tail gas of a monoammonium phosphate device, comprising the following steps: adding a water pipe on a washing circulating slot; starting the water pipe to introduce water into a Venturi scrubber by a washing circulating pump to wash pelletizing and drying tail gas; controlling the index of washing liquid; replacing the washing liquid; respectively discharging the washing liquid into a slurry collecting tank, a phosphoric acid underground slot or directly discharging to a sewage pool; and sending into an NPK device or a phosphoric acid workshop through a sewage pump. In the method for washing the tail gas of monoammonium phosphate provided in the invention, water is taken as the washing liquid; the washing liquid with high pH value can avoid the overflow of fluoride in the pelletizing and drying tail gas in the form of HF; the absorption of neutralized water to fluoride is much stronger than that of dilute phosphoric acid; a large amount of fluoride contained in the dilute phosphoric acid is cured in the monoammonium phosphate slurry in the form of compounds like (NH4)2SiF6 in the neutralizing process; and the other overflown fluoride enters the circulating water system together with the secondary steam, and causes the fluoride content to be off the scale of the discharged tail gas.
Description
Technical field
The present invention relates to a kind of method of washing tail gas of monoammonium phosphate device.
Background technology
At present, the device of slurry legal system phosphorus ammonia adopts pickling scheme washing tail gas mostly." pickling " is though technology can reclaim the heat that a large amount of tail gas generated by granulation carries, assimilation effect to effusion ammonia in the tail gas is better, but " pickling " process is not only relatively poor to effusion fluorine assimilation effect in the tail gas, and a large amount of fluorine in the phosphoric acid are deviate from direct emptying, there is the problem of the fluorine-containing severe overweight of tail gas.
With the big exit of valley MAP of chemical industry Co., Ltd device washing system is example, and this washing system adopts cycles of washing groove pickling scheme, in order to reclaim a large amount of dust, effusion ammonia, fluoride and the heat in the granulating and drying tail gas.In washing process, high-temperature tail gas (about 85～100 ℃) carries out heat, matter transmission with phosphoric acid,diluted, and phosphoric acid,diluted is heated (about 50～80 ℃), and this process is equivalent to concentrating of phosphoric acid.A large amount of fluorides in this process in the phosphoric acid,diluted are with HF and SiF
4Form overflow, cause that tail gas is fluorine-containing to exceed standard.Owing to contain a large amount of fluorides in the washing phosphoric acid, gas-liquid equilibrium concentration is bigger in addition, and the fluoride of overflowing in the granulating and drying tail gas can not be washed the phosphoric acid absorption and directly enter atmosphere by tail gas funnel in the Venturi scrubbing process.The tail gas monitoring is fluorine-containing up to 90.7mg/m
3, exceed standard 9.5 times.
Summary of the invention
The method that the purpose of this invention is to provide a kind of washing tail gas of monoammonium phosphate device.
The method of washing tail gas of monoammonium phosphate device provided by the present invention, be water as an alternative phosphoric acid as the cleaning solution of tail gas of monoammonium phosphate device; Set up water pipe on the cycles of washing groove, the unlatching water pipe makes water be pumped into Venturi scrubber by cycles of washing granulating and drying tail gas is washed; Until the pH of cleaning solution value is that 4-5 and proportion are 1.25-1.30t/m
3, then cleaning solution is entered slip feeder, phosphoric acid underground tank so that system recoveries.
When system is saturated can't all reclaim cleaning solution the time, cleaning solution more than needed can be entered cesspool and be sent to the NPK device or the phosphoric acid workshop is recycled.
In above-mentioned washing process, the pH value and the proportion of control cleaning solution are in order to seek equalization point between clean result and water consumption.Because high pH value and hyperbaric cleaning solution clean result are poor, then water consumption is too high but control low-gravity cleaning solution.Cleaning solution is disposed to the slip feeder and phosphoric acid pump groove is in order to reclaim phosphorus ammonium dust and the ammonia in the cleaning solution.After cleaning solution is disposed to cesspool, when cesspool can not reclaim these cleaning solutions fully, cleaning solution more than needed is delivered to phosphoric acid or the NPK device is recycled.Being pumped to phosphoric acid workshop and NPK device is because cleaning solution can not efflux, can only be in this device or each device comprehensive utilization of company.
Phosphorus ammonium exhaust washing method provided by the present invention has the following advantages: 1, method of the present invention does not adopt phosphoric acid as cleaning solution, and a large amount of fluorides of having avoided containing in the phosphoric acid,diluted are overflowed in the process that is heated by tail gas; The partially fluorinated thing of overflowing in the N-process with in and indirect steam enter circulation, unnecessary recirculated water is delivered to the NPK device or is handled the back through Sewage Disposal and discharge; In the closed circulation water system, fluorine effusion thing can reduce in a large number.2, method of the present invention adopts washing tail gas, and the cleaning solution of the high pH value water of a large amount of dust and effusion ammonia in the tail gas (that is: absorbed) can avoid fluoride in the granulating and drying tail gas with the form effusion of HF; And neutral water is more much better than to the absorption of fluoride than phosphoric acid,diluted.3, a large amount of fluorides that contain in the raw material phosphoric acid in N-process with (NH
4)
2SiF
6Be solidificated in the phosphor ammonium slurry Deng compound, all the other some effusion fluorides with in and indirect steam enter circulation, can not cause to efflux tail gas fluorine content overproof.
Description of drawings
Fig. 1 is the process chart of washing tail gas of monoammonium phosphate device provided by the present invention.
The specific embodiment
Below by specific embodiment method of the present invention is described, but the present invention is not limited thereto.Experimental technique described in the following embodiment if no special instructions, is conventional method; Described reagent and material if no special instructions, all can obtain from commercial channels.
Embodiment 1, slurry process prepare the washing tail gas of phosphorus ammonium
Wash according to process chart shown in Figure 1.
On the cycles of washing groove, set up water pipe, open water pipe water is sent in the cycles of washing groove as cleaning solution.By cleaning circulation pump cleaning solution being sent into Venturi scrubber washs granulating and drying tail gas; Proportion 1.25-1.30t/m until cleaning solution
3, pH value 4-5, then cleaning solution is entered slip feeder, phosphoric acid underground tank so that system recoveries.Enter cesspool and be sent to the NPK device or the phosphoric acid workshop is recycled when system is saturated can't all reclaim the time with cleaning solution more than needed.Adopt conventional acid washing method washing tail gas, it is fluorine-containing up to 90.7mg/m directly to enter in the tail gas of atmosphere monitoring by the tail chimney
3, exceed standard 9.5 times; Transform through this washing, 3.2mg/m is reduced in the monitoring of discharging tail gas
3, far below national secondary discharge standard (national grade ii standard＜9mg/m
3), solved the environmental problem of exhaust emissions fluorine content severe overweight.
Claims (2)
1. the exhaust washing method of a monoammonium phosphate device, it is characterized in that: on the cycles of washing groove, set up water pipe, opening water pipe sends in the cycles of washing groove water as cleaning solution, by cleaning circulation pump the cleaning solution in the cycles of washing groove being sent into Venturi scrubber granulating and drying tail gas is washed, is that 4-5 and proportion are 1.25-1.30t/m until the pH of cleaning solution value
3, displacement washing liquid enters slip feeder and/or phosphoric acid underground tank, so that system recoveries.
2. method according to claim 1 is characterized in that: described slip feeder and phosphoric acid underground tank are saturated can't all reclaim cleaning solution the time, cleaning solution more than needed is entered cesspool and be sent to the NPK device or the phosphoric acid workshop is recycled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102443361A CN101745293B (en) | 2009-12-29 | 2009-12-29 | Novel method for washing tail gas of monoammonium phosphate device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102443361A CN101745293B (en) | 2009-12-29 | 2009-12-29 | Novel method for washing tail gas of monoammonium phosphate device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101745293A CN101745293A (en) | 2010-06-23 |
| CN101745293B true CN101745293B (en) | 2011-12-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009102443361A Active CN101745293B (en) | 2009-12-29 | 2009-12-29 | Novel method for washing tail gas of monoammonium phosphate device |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101928046B (en) * | 2010-08-31 | 2012-05-02 | 瓮福（集团）有限责任公司 | Comprehensive utilization method for wastewater of ammonium phosphate production |
| CN103418224B (en) * | 2013-07-31 | 2016-01-13 | 安徽省司尔特肥业股份有限公司 | A kind of granular ammonium phosphate exhaust washing method |
| CN103395760B (en) * | 2013-08-07 | 2015-09-30 | 中国海洋石油总公司 | A kind of method utilizing phosphoric acid by wet process recirculated water to remove phosphorus ammonium recirculated water peculiar smell |
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Address after: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee after: China Blue Chemical Ltd. Patentee after: China Offshore Oil Group Co., Ltd. Co-patentee after: China BlueChemical Corporation Address before: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee before: China Blue Chemical Ltd. Patentee before: China National Offshore Oil Corporation Co-patentee before: China BlueChemical Corporation |
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