CN102584408B - Method for producing nitro-sulfur-based composite fertilizer by full-liquid phase high tower granulation - Google Patents
Method for producing nitro-sulfur-based composite fertilizer by full-liquid phase high tower granulation Download PDFInfo
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- CN102584408B CN102584408B CN201210079783.8A CN201210079783A CN102584408B CN 102584408 B CN102584408 B CN 102584408B CN 201210079783 A CN201210079783 A CN 201210079783A CN 102584408 B CN102584408 B CN 102584408B
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Abstract
The invention discloses a method for producing nitro-sulfur-based composite fertilizer by full-liquid phase high tower granulation. The method comprises the following steps of: reacting solid potassium chloride and concentrated sulfuric acid to prepare a potassium bisulfate solution of which the concentration is 94 to 96 percent; producing an ammonium nitrate solution of which the weight concentration is 93 to 95 percent; filling the potassium bisulfate solution and the ammonium nitrate solution into a middle groove of a granulation high tower through a dedicated conveying pipe by a pump provided with a metering device according to the amount; filling ammonia gas into the mixed solution of the potassium bisulfate and ammonium nitrate in the middle groove to adjust the PH value of the mixed solution until the solution is neutral; and pumping the mixed solution in the middle groove into a secondary evaporator on the granulation high tower through a middle pump to obtain the mixed solution of which the water content is less than or equal to 0.5 percent, wherein the mixed solution flows into a fusing groove and then enters a granulator from the fusing groove, and a nozzle of the granulator rotates to spray granules. The method is simple and convenient in technique and low in production cost, and can prepare the high-grade fertilizer which is high in purity and is completely water soluble.
Description
Technical field
The present invention relates to the production method of nitrate-based compound fertilizer, the method that specifically full liquid phase high tower prilling is produced nitrate-based compound fertilizer.
Background technology
At present; the existing high tower prilling technology production method nitrogenous, K composite fertilizer of utilizing has: (1) is stamped liquid ammonium nitrate high tower medial launder and then enter fusion tank after flash evaporator transpiring moisture; solid sulphuric acid potassium is put on high tower by bucket elevator; enter small feed bin; after entering again mixing tank for coating colors and liquid ammonium nitrate by fusion tank mixes after quantitative belt metering; enter again tablets press, through rotary nozzle ejection nature, drop to tower blanking bin and make finished granule.(2) under tower by urea melting, be delivered on tower and fully mix by the natural ventilation of shower nozzle spray coolingly with solid fertilizer phosphorous, potassium, material drops down onto tower blanking bin and obtains finished product.(3) solid urea carry to spray after melting on high tower mixes with solid fertilizer phosphorous, potassium again under tower compound fertilizer finished product.Therefore, existingly utilizing high tower technology to produce nitrogen, K composite fertilizer to be a kind of liquid starting material and to mix and make finished product with other solid material, there is complex process in this preparation method, and cost is high, the defect that mixing of materials is uneven, product impurity is many, can not be as high-end fertilizer.In addition, not only dust loss is large but also have a problem of operating environment of pollution for solid materials.
Summary of the invention
Object of the present invention is just to provide a kind of method that full liquid phase high tower prilling is produced nitrate-based compound fertilizer, to solve the complex manufacturing existing in prior art, cost is high, operating environment is poor, the problem of mixing of materials inequality, produces that purity is high, content has water miscible high-end nitrate-based compound fertilizer uniformly.
The present invention is achieved in that
The method that full liquid phase high tower prilling is produced nitrate-based compound fertilizer comprises the following steps:
(1) utilize solid potassium chloride to react in convertor with the vitriol oil, to produce weight concentration be the potassium hydrogen sulfate solution of 94-96% and be stored in tundish, and this tundish temperature remains on 150-170 ℃;
(2) ammonium nitrate solution that the weight concentration of producing through pressurization neutralisation is 93-95% is stored in the rare ammonium nitrate groove that is provided with attemperator, and this rare ammonium nitrate groove temperature remains on 130-140 ℃;
(3) potassium hydrogen sulfate solution in tundish by being housed, the pump of measuring apparatus is sent in the medial launder of granulation high tower via Special conveying pipe according to quantity;
(4) ammonium nitrate solution in rare ammonium nitrate groove is delivered in the medial launder on prilling tower via Special conveying pipe according to quantity by the pump of measuring apparatus is housed;
(5) to the ammonia of ventilating in the sal enixum in described medial launder and ammonium nitrate mixing solutions, regulate pH of mixed value to be neutral;
(6) mixed solution in described medial launder is squeezed in the flash evaporator on granulation high tower through line pump; after flash evaporator, obtain the mixed solution of moisture content≤0.5%; mixed solution flows into fusion tank, then enters tablets press by fusion tank, through tablets press shower nozzle rotation ejection granulation.
Wherein, in described medial launder, be provided with pH value automatic control system, described pH value automatic control system comprises the pH value sensor being installed in medial launder, the controller joining with sensor, the ammonia input tube being communicated with described medial launder fluid and the variable valve arranging on described ammonia input tube, and described pH value sensor, variable valve are electrically connected to described controller;
Described Special conveying pipe refers to carrying inner tube overcoat to have insulation outer tube, between described insulation outer tube and described conveying inner tube, forms ring-type interlayer, and in described ring-type interlayer, circulation has insulation steam; In described Special conveying pipe, from rare ammonium nitrate groove, tundish, to prilling tower section, adopt the sloping transfer line raising along throughput direction.
The preferred technical scheme of the present invention is:
Described insulation steam is 1.3 MPa.
The obliquity of described sloping transfer line is that perpendicular edge is 1:100 with the ratio of horizontal sides.
The present invention has designed the technical scheme of the mixed merga pass high tower prilling of liquid liquid and has produced nitrate-based compound fertilizer, both simplified technique, also reduced production cost, also make mixing of materials even simultaneously, and, for consecutive production, compare with the metering for solid, metering to liquid is more simple, and precision is higher.In addition, take liquid, liquid as raw material is through high tower prilling production composite fertilizer, not only aspect liquid transmission, metering, have advantage, and because of production link few, the chance that can produce in process of production contaminating impurity exists hardly, therefore, can make high purity, complete water-soluble high-end fertilizer.
The processing method that the present invention is designed, the raw material advantage of both having utilized liquid, liquid to mix, also the double process advantage of getting high tower prilling, rolls into one the advantage of the two.Compare with the high tower prilling technique that the solid, liquid existing for a long time mixes, the present invention saved solid under tower batch mixing, toward carrying on material, tower a series of devices such as quantitative belt interpolation, solid-liquid mixing tank for coating colors on tower, simplified production technique, beautified operating environment.Compare with the non-high tower prilling technology of full liquid phase, technique of the present invention has overcome the following defect of its existence: after (1) granulation, need further high temperature drying to cause energy consumption higher; (2) finished product returning charge is many, causes production efficiency low (3) finished product dust many, needs to reclaim, and operating environment is poor.
Embodiment
The method that this full liquid phase high tower prilling is produced nitrate-based compound fertilizer comprises the following steps:
(1) utilize raw material solid potassium chloride to react in convertor with the vitriol oil, control temperature is 130-150 ℃, reaction 3-4 hour, and the potassium hydrogen sulfate solution that generation weight concentration is 94-96%, wherein sulfuric acid content approximately 1%; The hydrogen chloride gas the generating by-product hydrochloric acid after two-stage absorption that all volatilize away with this understanding.Potassium hydrogen sulfate solution is temporary in tundish, and this tundish insulation is at 150-170 ℃;
(2) ammonium nitrate solution that the weight concentration of producing through pressurization neutralisation is 93-95% is stored in the rare ammonium nitrate groove that is provided with heat-insulating coil pipe temporary, and this rare ammonium nitrate groove temperature remains on 130-140 ℃;
(3) by the potassium hydrogen sulfate solution in tundish the pump by measuring apparatus is housed by 8m
3the flow of/h is sent in the medial launder of granulation high tower via Special conveying pipe;
(4) pump of the ammonium nitrate solution in rare ammonium nitrate groove by measuring apparatus is housed is by 40m
3the flow of/h is sent in the medial launder on prilling tower via Special conveying pipe;
(5) to the ammonia of ventilating in the sal enixum in described medial launder and ammonium nitrate mixing solutions, regulate pH of mixed value to be neutral, this regulate process is controlled automatically by the pH value automatic control system arranging in described medial launder.Described pH value automatic control system comprises the pH value sensor being installed in medial launder, the controller joining with sensor, the ammonia input tube being communicated with described medial launder fluid and the variable valve arranging on described ammonia input tube, and described pH value sensor, variable valve are electrically connected to described controller.Described pH value sensor is sent to controller by the pH value numerical signal recording, and by controller, according to the size of this numerical value, automatic control and adjustment valve regulation ammonia input flow rate, makes the pH value of the mixing solutions in described medial launder be neutral.The present invention is by passing into gas ammonia to regulate pH of mixed value to neutral in medial launder, thereby effectively avoids the acidity of sal enixum to affect the quality product of the finished product;
(6) mixed solution in medial launder is squeezed in the flash evaporator on tower through line pump, obtained the mixed solution of moisture content≤0.5% after flash evaporator, mixed solution flows into fusion tank, then enters tablets press by fusion tank, through tablets press shower nozzle rotation ejection granulation.
First the designed technique of the present invention make two kinds of raw materials mix in high tower medial launder, again through evaporator evaporation further to reduce water content, this technological design, makes in evaporator evaporation process, the rate that mixes of two mixed solutions further improves, thereby obtains more uniform mixed effect.
Special conveying pipe in the present invention, for carrying inner tube overcoat to have insulation outer tube, forms ring-type heat preservation sandwich layer between described insulation outer tube and described conveying inner tube, in described ring-type heat preservation sandwich layer, circulation has insulation steam.Because potassium hydrogen sulfate solution and the ammonium nitrate solution fusing point of higher concentration are higher, the possibility that plugging occurs in course of conveying is larger, the present invention avoids it in course of conveying, to occur that transport pipe stops up the problem that causes stop work and production, in described Special conveying pipe, from rare ammonium nitrate groove, tundish, adopts the sloping transfer line raising along throughput direction to prilling tower section.The obliquity of described sloping transfer line is that perpendicular edge is 1:100 with the ratio of horizontal sides, to guarantee after termination of pumping in pipe that solution can all flow backwards, is back in rare ammonium nitrate groove, tundish, avoids occurring pipeline blockage problem.In addition, the present invention's steam that also circulating pressure is 1.3MPa in ring-type interlayer is incubated potassium hydrogen sulfate solution, to avoid it to occur line clogging problem because of cooling, thus carrying out smoothly of guaranteeing to produce.
Claims (3)
1. full liquid phase high tower prilling is produced a method for nitrate-based compound fertilizer, it is characterized in that comprising the following steps:
(1) utilize solid potassium chloride to react in convertor with the vitriol oil, to produce weight concentration be the potassium hydrogen sulfate solution of 94-96% and be stored in tundish, and this tundish temperature remains on 150-170 ℃;
(2) ammonium nitrate solution that the weight concentration of producing through pressurization neutralisation is 93-95% is stored in the rare ammonium nitrate groove that is provided with attemperator, and this rare ammonium nitrate groove temperature remains on 130-140 ℃;
(3) potassium hydrogen sulfate solution in tundish by being housed, the pump of measuring apparatus is sent in the medial launder of granulation high tower via Special conveying pipe according to quantity;
(4) ammonium nitrate solution in rare ammonium nitrate groove is delivered in the medial launder on prilling tower via Special conveying pipe according to quantity by the pump of measuring apparatus is housed;
(5) to the ammonia of ventilating in the sal enixum in described medial launder and ammonium nitrate mixing solutions, regulate pH of mixed value to be neutral;
(6) mixed solution in described medial launder is squeezed in the flash evaporator on granulation high tower through line pump, after flash evaporator, obtain the mixed solution of moisture content≤0.5%, mixed solution flows into fusion tank, then enters tablets press by fusion tank, through tablets press shower nozzle rotation ejection granulation;
Wherein, in described medial launder, be provided with pH value automatic control system, described pH value automatic control system comprises the pH value sensor being installed in medial launder, the controller joining with sensor, the ammonia input tube being communicated with described medial launder fluid and the variable valve arranging on described ammonia input tube, and described pH value sensor, variable valve are electrically connected to described controller;
Described Special conveying pipe refers to carrying inner tube overcoat to have insulation outer tube, between described insulation outer tube and described conveying inner tube, forms ring-type interlayer, and in described ring-type interlayer, circulation has insulation steam; In described Special conveying pipe, from rare ammonium nitrate groove, tundish, to prilling tower section, adopt the sloping transfer line raising along throughput direction.
2. the method that full liquid phase high tower prilling according to claim 1 is produced nitrate-based compound fertilizer, is characterized in that described insulation steam is 1.3MPa.
3. the method that full liquid phase high tower prilling according to claim 1 is produced nitrate-based compound fertilizer, the obliquity that it is characterized in that described sloping transfer line is that perpendicular edge is 1:100 with the ratio of horizontal sides.
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| CN201210079783.8A CN102584408B (en) | 2012-03-23 | 2012-03-23 | Method for producing nitro-sulfur-based composite fertilizer by full-liquid phase high tower granulation |
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| CN201210079783.8A CN102584408B (en) | 2012-03-23 | 2012-03-23 | Method for producing nitro-sulfur-based composite fertilizer by full-liquid phase high tower granulation |
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| CN102584408B true CN102584408B (en) | 2014-01-15 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104926374B (en) * | 2015-06-30 | 2017-12-19 | 河北冀衡赛瑞化工有限公司 | A kind of production method of sulfenyl nitrate fertilizer |
| CN105198520B (en) * | 2015-08-14 | 2019-02-01 | 中国石油化工股份有限公司 | Prevent the method that ammonium nitrate fires in high-tower granulation production nitrate-based compound fertilizer technique |
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| CN1165130A (en) * | 1997-03-26 | 1997-11-19 | 山东省临沂市化工总厂 | Method for preparing sulfonyl azophoska compound fertilizer |
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