CN112898069A - Ammonia-acid method compound fertilizer production system - Google Patents
Ammonia-acid method compound fertilizer production system Download PDFInfo
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- CN112898069A CN112898069A CN202110078034.2A CN202110078034A CN112898069A CN 112898069 A CN112898069 A CN 112898069A CN 202110078034 A CN202110078034 A CN 202110078034A CN 112898069 A CN112898069 A CN 112898069A
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B7/00—Fertilisers based essentially on alkali or ammonium orthophosphates
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G5/00—Fertilisers characterised by their form
- C05G5/10—Solid or semi-solid fertilisers, e.g. powders
- C05G5/12—Granules or flakes
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Abstract
The invention provides an ammonia-acid method compound fertilizer production system, which comprises the following steps: a neutralization reaction system, wherein mixed acid solution and gas ammonia are introduced into the neutralization reaction system; the output end of the neutralization reaction system is connected with the granulation system, and the neutralization slurry and the conveyed raw materials are mixed to carry out granulation production of the compound fertilizer to form a semi-finished product material; the output end of the granulation system is connected with the compound fertilizer post-treatment system, and the compound fertilizer post-treatment system is used for post-treating the semi-finished product materials to obtain a finished compound fertilizer; and the tail gas treatment system is connected with the granulation system and the compound fertilizer post-treatment system and is used for treating the flue gas generated in the granulation and post-treatment processes to obtain purified flue gas emission. The finished compound fertilizer prepared by the production system has stable nutrient indexes, improved granulation rate and increased particle strength, achieves the aim of improving the quality of the compound fertilizer prepared by the ammonia-acid method, has small environmental pollution and meets the requirement of environmental protection.
Description
Technical Field
The invention belongs to the field of compound fertilizer preparation, and particularly relates to an ammonia-acid method compound fertilizer production system.
Background
In the preparation process of the compound fertilizer, a common compound fertilizer granulation method comprises an ammonia granulation method, namely, the compound fertilizer is produced by granulating powdery raw materials of monoammonium phosphate, urea and potassium sulfate in a granulator under the atmosphere of ammonia gas. The compound fertilizer prepared by the method has the following defects: 1. the nutrient indexes of the finished product are difficult to control, the fluctuation is large, and the stability is low; 2. the surface of the particles is not smooth, the granulation rate is low, the particle strength is low, certain gap exists between the particle strength and market requirements, and the market acceptance is low.
How to improve the stability of nutrient indexes of a finished product after the compound fertilizer granulation and improve the circularity, the granulation rate and the granule strength of granules is a technical problem to be solved urgently in the current compound fertilizer granulation process.
Therefore, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
The invention aims to provide a production system of an ammonia-acid method compound fertilizer, which at least solves the problems of large fluctuation of finished product nutrient indexes, low granulation rate and low particle strength in the production process of the prior compound fertilizer adopting the ammonia-acid method.
In order to achieve the above purpose, the invention provides the following technical scheme:
an amino acid method compound fertilizer production system, the production system includes:
a neutralization reaction system, wherein mixed acid solution and gas ammonia are introduced into the neutralization reaction system, and the neutralization reaction system is used for neutralization reaction of raw materials to form neutralized slurry;
the output end of the neutralization reaction system is connected with the granulation system, the granulation system is also connected with a material conveying and metering device, the material conveying and metering device is used for conveying raw materials into the granulation system, and the neutralization slurry and the conveyed raw materials are mixed to carry out granulation production of the compound fertilizer so as to form a semi-finished product material;
the output end of the granulation system is connected with the compound fertilizer post-treatment system, and the compound fertilizer post-treatment system is used for post-treating the semi-finished product materials to obtain a finished compound fertilizer after treatment;
and the tail gas treatment system is used for treating the flue gas generated in the granulation and post-treatment processes and obtaining purified flue gas emission after treatment.
In the ammonia-acid method compound fertilizer production system, preferably, the compound fertilizer post-treatment system comprises a drying device, a cooling device and a screening device;
the output end of the granulation system is connected with the drying device, the output end of the drying device is connected with the cooling device, the output end of the cooling device is connected with the screening device, and semi-finished materials generated by the granulation system are dried, cooled and screened by the drying device, the cooling device and the screening device in sequence to form a finished compound fertilizer;
preferably, the cooling device comprises two stages of cooling, namely a first-stage cooling roller and a second-stage cooling roller, and the temperature of the semi-finished compound fertilizer is reduced to below 50 ℃ after the two stages of cooling.
In the ammonia-acid method compound fertilizer production system, preferably, the compound fertilizer post-treatment system further comprises a crushing device, the crushing device is connected with the screening device, and large-particle and fine-particle compound fertilizers obtained after screening are crushed and then return to the granulation system;
preferably, the particle size of the large-particle compound fertilizer is larger than 4.2mm, and the particle size of the fine-particle compound fertilizer is smaller than 2.5 mm.
In the ammonia-acid process compound fertilizer production system, preferably, the drying device is connected with a hot blast heater, and the hot blast heater conveys hot air into the drying device through the hot blast heater.
In the ammonia-acid process compound fertilizer production system, preferably, the tail gas treatment system comprises a primary tail gas washing device, a secondary tail gas washing device and a cyclone dust collector, wherein the input end of the primary tail gas washing device is connected with the flue gas output end of the granulation system, and the flue gas output end of the primary tail gas washing device is connected with the flue gas input end of the secondary tail gas washing device; the flue gas input end of the cyclone dust collector is connected with the flue gas output end of the drying device, and the flue gas output end of the cyclone dust collector is connected with the flue gas input end of the secondary tail gas washing device;
preferably, an induced draft fan is arranged on a connecting pipeline between the granulation system and the primary tail gas washing device, and an induced draft fan is arranged on a connecting pipeline between the cyclone dust collector and the secondary tail gas washing device.
In the ammonia-acid process compound fertilizer production system, preferably, the first-stage tail gas washing device is a venturi scrubber, and the second-stage tail gas washing device is a tail gas washing tower;
the washing liquid in the venturi scrubber is acidic, and the washing liquid in the tail gas washing tower is neutral;
preferably, the washing liquid in the venturi scrubber is phosphoric acid solution, and the washing liquid in the tail gas washing tower is ammonium phosphate solution.
In the ammonia-acid method compound fertilizer production system, preferably, the flue gas output end of the secondary tail gas washing device is connected with the electric demister, and the flue gas passing through the secondary tail gas washing device is treated by the electric demister and then discharged from a chimney.
In the ammonia-acid method compound fertilizer production system, preferably, the mixed acid solution is a mixture of a potassium hydrogen sulfate solution and a phosphoric acid solution; the volume ratio of the potassium hydrogen sulfate solution to the phosphoric acid solution is 1: (0.6-0.8);
preferably, the specific gravity of the mixed acid solution is controlled to be 1.55-1.56.
In the ammonia-acid process compound fertilizer production system, preferably, the neutralization reaction system comprises a tubular reactor and a flowmeter, and the mixed acid solution and the ammonia gas are metered by the flowmeter and then are conveyed into the tubular reactor for neutralization reaction.
In the ammonia-acid process compound fertilizer production system, preferably, the granulation system is further connected with a steam input pipeline for conveying steam to the granulation system, and the temperature for granulation production in the granulation system is 70-80 ℃;
preferably, the raw materials conveyed within the granulation system include urea, monoammonium phosphate particles, and additives.
Compared with the closest prior art, the technical scheme provided by the invention has the following excellent effects:
according to the ammonia-acid method compound fertilizer production system, mixed acid raw materials (potassium hydrogen sulfate solution and phosphoric acid solution) are adopted to replace part of monoammonium phosphate, and all potassium sulfate powdery raw materials and concentrated sulfuric acid in the production process.
The ammonia-acid method compound fertilizer production system is provided with the two-stage tail gas washing device and the cyclone dust collector, and can effectively purify the polluted tail gas generated in the granulation process and the drying process, so that the emission of the flue gas meets the environmental protection requirement, and the environmental pollution is small.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. Wherein:
FIG. 1 is a process flow diagram of an ammonia-acid method compound fertilizer production system in an embodiment of the invention.
In the figure: 1. a tubular reactor; 2. a flow meter; 3. a granulator; 4. a dryer; 5. a cooling device; 6. screening machine; 7. a venturi scrubber; 8. a tail gas wash tower; 9. a cyclone dust collector; 10. an electric demister; 11. an induced draft fan.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are for convenience of description of the present invention only and do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "connected" and "connected" used herein should be interpreted broadly, and may include, for example, a fixed connection or a detachable connection; they may be directly connected or indirectly connected through intermediate members, and specific meanings of the above terms will be understood by those skilled in the art as appropriate.
As shown in fig. 1, according to an embodiment of the present invention, there is provided an ammonia-acid process compound fertilizer production system, which includes a neutralization reaction system, a granulation system, a compound fertilizer post-treatment system, and an off-gas treatment system.
Mixed acid solution and gas ammonia are introduced into the neutralization reaction system, and the neutralization reaction system is used for neutralization reaction of raw materials to form neutralized slurry.
In the embodiment of the invention, the neutralization reaction system comprises a tubular reactor 1 and a flow meter 2, and the mixed acid solution and the ammonia gas are metered by the flow meter 2 and then are conveyed into the tubular reactor 1 for neutralization reaction. The reaction temperature in the tubular reactor 1 is 150 ℃, the reaction time is 2-4 seconds, the process conditions in the tubular reactor 1 can ensure that the mixed acid solution and the gaseous ammonia can be subjected to sufficient neutralization reaction, the gaseous ammonia is excessive, and the excessive gaseous ammonia and the neutralized slurry enter a granulation system.
The mixed acid solution is a mixture of a potassium hydrogen sulfate solution and a phosphoric acid solution; the volume ratio of the potassium hydrogen sulfate solution to the phosphoric acid solution is 1: (0.6-0.8) (e.g., 1:0.62, 1:0.64, 1:0.66, 1:0.68, 1:0.7, 1:0.72, 1:0.74, 1:0.76, 1:0.78), preferably, the volume ratio of the potassium hydrogen sulfate solution to the phosphoric acid solution is 1: 0.69; the specific gravity of the mixed acid is controlled within the range of 1.55-1.56 (such as 1.552, 1.554, 1.556 and 1.558).
Preferably, the specific gravity of the mixed acid solution is controlled to be 1.56; the phosphoric acid solution has a concentration of 20-22% by mass (e.g., 20.2%, 20.4%, 20.6%, 20.8%, 21%, 21.2%, 21.4%, 21.6%, 21.8%).
Wherein, sulfuric acid and potassium chloride react at low temperature in the conversion tank to generate a solution of potassium bisulfate and excessive sulfuric acid; phosphoric acid is generated by the reaction of phosphorite and sulfuric acid. KCl and H2SO4Potassium bisulfate and hydrogen chloride gas are generated under the heating condition, and the reaction equation is as follows: KCl + H2SO4＝KHSO4+HCl↑
The mixed acid and the gas ammonia are subjected to neutralization reaction in the tubular reactor 1 and then sprayed into the granulator 3 to produce the compound fertilizer, and the chemical reaction in the tubular reactor 1 comprises the following steps:
2KHSO4+2NH3＝K2SO4+(NH4)2SO4
H2SO4+2NH3＝(NH4)2SO4
H3PO4+3NH3＝(NH4)3PO4
the reaction mainly generates a mixture of ammonium sulfate, ammonium phosphate and potassium sulfate, and the mixture and unreacted gaseous ammonia participate in the subsequent granulation reaction.
The output end of the neutralization reaction system is connected with the granulation system, the granulation system is also connected with a material conveying and metering device, the material conveying and metering device can be an electronic metering belt, the material conveying and metering device is used for conveying raw materials into the granulation system, the raw materials are respectively metered according to the process formula requirements and then are conveyed into the granulator 3 through uniform mixing, and the neutralization slurry and the conveyed raw materials are mixed to carry out granulation production of the compound fertilizer, so that a semi-finished product is formed.
In the embodiment of the present invention, the granulating system comprises a granulator 3, and the raw material is granulated and produced in the granulator 3 to form a semi-finished material. The raw materials conveyed in the granulation system comprise urea, monoammonium phosphate powdery particles and additives, and the proportion of the urea and the monoammonium phosphate meets the formula requirements.
Preferably, the additive is one or a mixture of several of bentonite, zinc sulfate, manganese sulfate and humic acid, the types of the compound fertilizers are different, the additive is also different, and the addition amount of the additive is 0.1-10% (such as 0.2%, 0.4%, 0.6%, 0.8%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%) of the mass of the produced compound fertilizer, and is preferably 1%. The main mineral component of bentonite in the additive is montmorillonite, and the content is 85-90 wt%.
The granulation system is also connected with a steam input pipeline for conveying steam to the granulation system, the temperature of granulation production in the granulation system reaches 70-80 ℃ under the action of the steam, and the flow of the steam is regulated and controlled through a valve; the materials are agglomerated and granulated in a granulator 3 at the temperature of 70-80 ℃ under the regulation of steam and gas ammonia. In the specific embodiment of the invention, the steam conveyed in the granulator 3 is the steam generated in the waste heat boiler, and the granulation production is carried out in the granulator 3 for 8-12 minutes.
The output end of the granulation system is connected with the compound fertilizer post-treatment system, and the compound fertilizer post-treatment system is used for post-treating semi-finished materials to obtain finished compound fertilizers after treatment.
In a specific embodiment of the invention, the compound fertilizer post-treatment system comprises a drying device, a cooling device 5 and a screening device. The output end of the granulator 3 is connected with a drying device, the output end of the drying device is connected with a cooling device 5, the output end of the cooling device 5 is connected with a screening device, and a semi-finished product material generated by a granulation system is dried, cooled and screened to form a finished compound fertilizer; preferably, the drying device is connected with a hot blast stove, the hot blast stove conveys hot air into the drying device through the hot blast machine, and the wet material finishes the drying process under the action of the hot air. Specifically, the drying device is a dryer 4, and the screening device is a screening machine 6.
Preferably, the cooling device 5 comprises two stages of cooling, namely a first-stage cooling roller and a second-stage cooling roller, and the temperature of the semi-finished compound fertilizer is reduced to below 50 ℃ after the two stages of cooling. After two-stage cooling, the semi-finished compound fertilizer can meet the screening requirement, and the influence of high temperature on the service life of the screening device is avoided.
The post-treatment system also comprises a crushing device, the crushing device is connected with the screening device, and large-particle and fine-particle compound fertilizers obtained after screening are crushed and then return to the granulation system as return materials; preferably, the particle size of the large particle compound fertilizer is larger than 4.2mm, and the particle size of the fine particle compound fertilizer is smaller than 2.5 mm. The particle size of the finished compound fertilizer after granulation is 2.0-4.0mm, oversize or ultrafine particles which do not meet the normal particle size after screening need to be crushed by a crushing device and then return to the granulator 3 for granulation, and the oversize or ultrafine particles and the raw materials conveyed in the granulator 3 participate in the granulation process together. And drying, cooling and screening the semi-finished product materials granulated in the granulator 3 again to obtain the compound fertilizer meeting the requirement of particle size, and circularly operating the process to finish the production process of the high-quality compound fertilizer.
The granulation system and the compound fertilizer post-treatment system are both connected with the tail gas treatment system, the tail gas treatment system is used for treating the flue gas generated in the granulation and post-treatment processes, and the purified flue gas obtained after treatment is discharged through a chimney.
In a specific embodiment of the invention, the tail gas treatment system comprises a primary tail gas washing device, a secondary tail gas washing device and a cyclone dust collector 9, wherein the input end of the primary tail gas washing device is connected with the flue gas output end of the granulator 3, and the flue gas output end of the primary tail gas washing device is connected with the flue gas input end of the secondary tail gas washing device; the flue gas input end of cyclone 9 is connected with the flue gas output end of drying-machine 4, and the flue gas output end of cyclone 9 is connected with the flue gas input end of second grade tail gas washing device.
Preferably, the first-stage tail gas washing device is a venturi scrubber 7, and the second-stage tail gas washing device is a tail gas washing tower 8; the scrubbing liquid in the venturi scrubber 7 is acidic, and the scrubbing liquid in the tail gas scrubbing tower 8 is neutral. Preferably, the scrubbing liquid in the venturi scrubber is a phosphoric acid solution and the scrubbing liquid in the tail gas scrubbing tower is an ammonium phosphate solution. The flue gas waste gas output from the granulator 3 is alkaline, and is firstly neutralized by an acidic washing solution in a Venturi scrubber 7, and then enters a tail gas washing tower 8 for washing and absorption, and finally the obtained neutral gas is discharged.
The flue gas from the granulator 3 is subjected to two-stage washing flue gas purification treatment sequentially through a Venturi scrubber 7 and a tail gas washing tower 8 to obtain the flue gas which can reach the emission standard; the flue gas from the dryer 4 contains dust, the gas-solid mixture is collected by the dust particles of the cyclone dust collector 9, the flue gas directly enters the tail gas washing tower 8, and the flue gas is purified and then reaches the emission standard.
Preferably, an induced draft fan 11 is arranged on a connecting pipeline between the granulation system and the primary tail gas washing device, and an induced draft fan 11 is also arranged on a connecting pipeline between the cyclone dust collector 9 and the secondary tail gas washing device. The waste gas produced by the granulator 3 is conveyed to the venturi scrubber 7 by the induced draft fan 11, the dried tail gas is dedusted by the cyclone deduster 9 and then conveyed to the tail gas washing tower 8 by the induced draft fan 11 for washing, and the flue gas is purified and then discharged.
In the specific embodiment of the invention, the secondary tail gas washing device is also connected with the electric demister 10, and the flue gas passing through the secondary tail gas washing device is subjected to dehumidification treatment by the electric demister 10 and then is discharged from a chimney after reaching the standard.
The main production process of the ammonia-acid method compound fertilizer production system comprises the following steps:
the mixed acid solution obtained by mixing the potassium hydrogen sulfate solution and the phosphoric acid solution and the gas ammonia are metered by a flowmeter 2 and then are conveyed into a tubular reactor 1 for continuous reaction to form neutralized slurry.
And spraying the formed neutralized slurry into a material layer of a granulator 3, simultaneously respectively metering urea, monoammonium phosphate and bentonite according to the requirements of a process formula, uniformly stirring by a mixer, conveying into the granulator 3 by an electronic metering belt, and conveying steam into the granulator 3. The materials are agglomerated and granulated in a granulator 3 at the temperature of 70-80 ℃ under the regulation of steam and gas ammonia.
The granulated wet material enters a dryer 4 for drying and dehydration, and dry hot air in the dryer 4 is provided by a hot air furnace through a hot air heater; after the dried materials are cooled in two stages, the materials are conveyed to a sieving machine 6 by a hoisting machine, and the sieved large particles and undersize materials are crushed and then return to a granulator 3 as return materials for granulation. The particles with qualified size are subjected to moisture-proof and anti-caking coating treatment and then enter a finished product for metering and packaging. And (4) conveying the packaged finished product to a storehouse by a forklift for storage.
The waste gas generated by the granulator 3 is conveyed to a Venturi scrubber 7 and a tail gas washing tower 8 by a draught fan 11 for washing; the tail gas of the dryer 4 is dedusted by the high-efficiency cyclone 9, then is sent to the washing liquor of the tail gas washing tower 8 by the induced draft fan 11, and is discharged by a chimney after passing through the electric demister 10.
Comparative example
In the comparative example, the conventional raw materials are adopted to produce the compound fertilizer, specifically, the raw materials for the neutralization reaction are concentrated sulfuric acid, gas ammonia and monoammonium phosphate slurry which is obtained by dissolving monoammonium phosphate by water or compound fertilizer tail gas washing liquid, and the specific gravity of the monoammonium phosphate slurry is 1410kg/m3. The raw materials conveyed in the granulator adopt urea, monoammonium phosphate and potassium sulfate. Other steps and methods are the same as the examples, and the compound fertilizer prepared in the comparative example and the compound fertilizer prepared in the examples are compared in performance (three aspects of finished product nutrient fluctuation range, establishment rate and finished product particle strength) as shown in the following table 1.
TABLE 1 comparison of the Properties of Compound fertilizers produced in the control and examples
As can be seen from Table 1, the compound fertilizer produced by the ammonia-acid method compound fertilizer production system has the advantages of smaller fluctuation range in finished product nutrients, higher product establishment rate, higher finished product particle strength and remarkable advantages.
In summary, in the production system of the ammonia-acid method compound fertilizer, mixed acid raw materials (potassium hydrogen sulfate solution and phosphoric acid solution) are adopted to replace part of monoammonium phosphate, and all potassium sulfate powdery raw materials and concentrated sulfuric acid in the production process.
In addition, the ammonia-acid method compound fertilizer production system is provided with a two-stage tail gas washing device and a cyclone dust collector, and can effectively purify the polluted tail gas generated in the granulation process and the drying process, so that the emission of the flue gas meets the environmental protection requirement, and the environmental pollution is small.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An amino acid method compound fertilizer production system, its characterized in that, production system includes:
a neutralization reaction system, wherein mixed acid solution and gas ammonia are introduced into the neutralization reaction system, and the neutralization reaction system is used for neutralization reaction of raw materials to form neutralized slurry;
the output end of the neutralization reaction system is connected with the granulation system, the granulation system is also connected with a material conveying and metering device, the material conveying and metering device is used for conveying raw materials into the granulation system, and the neutralization slurry and the conveyed raw materials are mixed to carry out granulation production of the compound fertilizer so as to form a semi-finished product material;
the output end of the granulation system is connected with the compound fertilizer post-treatment system, and the compound fertilizer post-treatment system is used for post-treating the semi-finished product materials to obtain a finished compound fertilizer after treatment;
and the tail gas treatment system is used for treating the flue gas generated in the granulation and post-treatment processes and obtaining purified flue gas emission after treatment.
2. The ammonia-acid process compound fertilizer production system as claimed in claim 1, wherein the compound fertilizer post-treatment system comprises a drying device, a cooling device and a screening device;
the output end of the granulation system is connected with the drying device, the output end of the drying device is connected with the cooling device, the output end of the cooling device is connected with the screening device, and semi-finished materials generated by the granulation system are dried, cooled and screened by the drying device, the cooling device and the screening device in sequence to form a finished compound fertilizer;
preferably, the cooling device comprises two stages of cooling, namely a first-stage cooling roller and a second-stage cooling roller, and the temperature of the semi-finished compound fertilizer is reduced to below 50 ℃ after the two stages of cooling.
3. The ammonia-acid method compound fertilizer production system of claim 2, wherein the compound fertilizer post-treatment system further comprises a crushing device, the crushing device is connected with the screening device, and large-particle and fine-particle compound fertilizers obtained after screening are crushed and then return to the granulation system;
preferably, the particle size of the large-particle compound fertilizer is larger than 4.2mm, and the particle size of the fine-particle compound fertilizer is smaller than 2.5 mm.
4. The ammonia-acid process compound fertilizer production system of claim 2, wherein the drying device is connected with a hot blast stove, and the hot blast stove conveys hot air into the drying device through a hot blast heater.
5. The ammonia-acid process compound fertilizer production system of claim 2, wherein the tail gas treatment system comprises a primary tail gas washing device, a secondary tail gas washing device and a cyclone dust collector, wherein the input end of the primary tail gas washing device is connected with the flue gas output end of the granulation system, and the flue gas output end of the primary tail gas washing device is connected with the flue gas input end of the secondary tail gas washing device; the flue gas input end of the cyclone dust collector is connected with the flue gas output end of the drying device, and the flue gas output end of the cyclone dust collector is connected with the flue gas input end of the secondary tail gas washing device;
preferably, an induced draft fan is arranged on a connecting pipeline between the granulation system and the primary tail gas washing device, and an induced draft fan is arranged on a connecting pipeline between the cyclone dust collector and the secondary tail gas washing device.
6. The ammonia-acid process compound fertilizer production system of claim 5, wherein the primary tail gas washing device is a venturi scrubber, and the secondary tail gas washing device is a tail gas washing tower;
the washing liquid in the venturi scrubber is acidic, and the washing liquid in the tail gas washing tower is neutral;
preferably, the washing liquid in the venturi scrubber is phosphoric acid solution, and the washing liquid in the tail gas washing tower is ammonium phosphate solution.
7. The ammonia-acid method compound fertilizer production system of claim 5, wherein the flue gas output end of the secondary tail gas washing device is connected with an electric demister, and the flue gas passing through the secondary tail gas washing device is treated by the electric demister and then discharged from a chimney.
8. The ammonia-acid method compound fertilizer production system of claim 1, wherein the mixed acid solution is a mixture of a potassium hydrogen sulfate solution and a phosphoric acid solution; the volume ratio of the potassium hydrogen sulfate solution to the phosphoric acid solution is 1: (0.6-0.8);
preferably, the specific gravity of the mixed acid solution is controlled to be 1.55-1.56.
9. The ammonia-acid method compound fertilizer production system of claim 1, wherein the neutralization reaction system comprises a tubular reactor and a flow meter, and the mixed acid solution and the ammonia gas are metered by the flow meter and then are conveyed into the tubular reactor for neutralization reaction.
10. The ammonia-acid method compound fertilizer production system of claim 1, wherein the granulation system is further connected with a steam input pipeline for conveying steam to the granulation system, and the temperature for granulation production in the granulation system is 70-80 ℃;
preferably, the raw materials conveyed within the granulation system include urea, monoammonium phosphate particles, and additives.
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| CN114735720A (en) * | 2022-04-25 | 2022-07-12 | 云南云天化云峰化工有限公司 | Method and system for producing granular ammonium sulfate by drum granulation through circulating neutralization method |
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| CN102886196A (en) * | 2012-09-20 | 2013-01-23 | 山东聊城鲁西化工第五化肥有限公司 | Treatment method and treatment system for ammoniated pelleting compound fertilizer tail gas |
| CN103588541A (en) * | 2013-11-04 | 2014-02-19 | 山东聊城鲁西化工第五化肥有限公司 | System and process for one-time neutralization ammonification granulation production of compound fertilizer |
| CN108658690A (en) * | 2018-08-24 | 2018-10-16 | 山东鸿运工程设计有限公司 | A kind of production system and its production method of microbial organic/inorganic compound fertilizer |
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| CN114735720A (en) * | 2022-04-25 | 2022-07-12 | 云南云天化云峰化工有限公司 | Method and system for producing granular ammonium sulfate by drum granulation through circulating neutralization method |
| CN114735720B (en) * | 2022-04-25 | 2023-08-18 | 云南云天化云峰化工有限公司 | Method and system for producing granular ammonium sulfate by rotary drum granulation through cyclic neutralization method |
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