CN211255764U - Ammonium nitrate-sulfur compound fertilizer's apparatus for producing - Google Patents
Ammonium nitrate-sulfur compound fertilizer's apparatus for producing Download PDFInfo
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- CN211255764U CN211255764U CN201922237531.3U CN201922237531U CN211255764U CN 211255764 U CN211255764 U CN 211255764U CN 201922237531 U CN201922237531 U CN 201922237531U CN 211255764 U CN211255764 U CN 211255764U
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Abstract
The utility model discloses a production device of ammonium nitrate-sulfate compound fertilizer, which comprises a feeding unit, a mixing reaction unit, a granulation unit, a product cooling unit and a tail gas treatment unit; the production method comprises the following steps: adding a magnesium sulfate solution into ammonium sulfate solid and ammonium nitrate molten liquid with the molar ratio of ammonium sulfate to ammonium nitrate of 0.65-1: 1, wherein the dosage of the magnesium sulfate is 1-1.2% of the total weight of the ammonium sulfate, the ammonium nitrate and the magnesium sulfate; the mixture is reacted through the first-stage premixing reaction and the second-stage high-temperature synthesis reaction to form slurry, and then the slurry is sprayed, cooled and solidified to form a granular product. The production device and the production process provided by the utility model thoroughly solve the problems of difficult granulation, uneven content, unstable quality and the like of the product in the production of ammonium nitrate-sulfate compound fertilizer.
Description
Technical Field
The utility model relates to a production device of ammonium nitrate-sulfate compound fertilizer.
Background
Ammonium nitrate is an excellent chemical fertilizer because of containing ammonium nitrogen and nitrate nitrogen, but the application of the ammonium nitrate as a chemical fertilizer in agricultural production is greatly limited due to the explosiveness of the ammonium nitrate, and many countries including China require that the ammonium nitrate can be used for agricultural fertilization after being subjected to anti-knock modification.
The modification is usually carried out by using organic materials (cyanuric acid, etc.) or inorganic materials (MAP, DAP phosphate, or lime, dolomite, etc.) as antiknock agent. The soil adaptability and modification cost are high, so that the method cannot be applied to agricultural production in a large area, the application of nitrate nitrogen is seriously influenced, the productivity exertion of an ammonium nitrate device is further influenced, the operating rate of the nitric acid device is reduced, the healthy development of nitric acid and ammonium nitrate industries is hindered, the use of nitrate nitrogen in China is obviously lower than the international level, and the overall effective utilization rate of the double-nitrate industry is lower than 70%.
Because of the conditions of large use of high-concentration fertilizers such as urea and ammonium phosphate, emission limitation of sulfur-containing gas and the like, the area of sulfur deficiency in soil is increased, and therefore, the modification of ammonium nitrate by using sulfur-containing materials such as ammonium sulfate for agricultural production is an effective way.
United states holliville international patent 200980135788.4 discloses a method of preparing a composition containing ammonium nitrate double salts. The method comprises providing a mixture comprising ammonium nitrate, ammonium sulfate and water at a ratio of ammonium sulfate to ammonium nitrate of about 0.9 to 1.1:1 on a molar basis at a temperature of less than 175 ℃, wherein the amount of water added to the mixture is from about 2 wt% to about 24 wt% based on the total weight of ammonium nitrate, ammonium sulfate and water in the melt. However, the method has the advantages that the reaction temperature in the traditional process such as patent 6689181 and EP1923376 is reduced to 175 ℃ from 180-210 ℃, and the decomposition rate of ammonium nitrate is reduced. However, the disadvantage is that the reaction mixture has a relatively high water content, which increases the curing and drying costs and is disadvantageous for the improvement of the modification efficiency.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a production method and apparatus for ammonium sulfate nitrate compound fertilizer solves the technical problem that ammonium sulfate addition range is narrow, the mixed reaction is inhomogeneous and the energy consumption is high in the production process in the present ammonium sulfate nitrate production.
The utility model discloses an adopt following technical scheme to realize:
the utility model also provides a production device of the ammonium nitrate-sulfate compound fertilizer, which comprises a feeding unit, a mixing reaction unit, a granulation unit, a product cooling unit and a tail gas treatment unit;
the feeding unit comprises an ammonium sulfate connecting conveyor, an ammonium nitrate meter, a magnesium sulfate meter and a feeding groove;
the mixed reaction unit comprises a pre-reactor and a synthesis reactor, wherein a first-stage pre-mixing reaction is carried out in the pre-reactor, and a second-stage high-temperature synthesis reaction is carried out in the synthesis reactor; a stirrer is arranged in the pre-reactor, a top inlet is respectively connected with the ammonium sulfate conveyor and the ammonium nitrate meter, an upper mixed liquid outlet of the pre-reactor is connected with the synthesis reactor, the stirrer is arranged in the synthesis reactor, and a top inlet is connected with the magnesium sulfate meter;
the granulation unit comprises a granulation pump, a granulator, a crusher, a vibrating screen and a wrapping device; the product cooling unit comprises a powder cooler; the tail gas treatment unit comprises a centrifugal rotary type gas-solid separator;
an upper outlet of the synthesis reactor is communicated with an inlet at the top of the feeding trough; an outlet at the bottom of the feeding groove is communicated with an inlet of the granulation pump; the outlet of the granulating pump is communicated with a feeding pipeline of the granulating machine; the material at the outlet of the granulator enters the bottom of the bucket elevator along a chute, the material coming out of the top of the bucket elevator enters a vibrating screen along the chute, the qualified particles at the outlet of the vibrating screen enter the upper part of a powder cooler along the chute, the outlet of the powder cooler is connected with a finished product belt to lead to a wrapping device, and the finished product is wrapped by the wrapping device and then packaged; oversized particles at the outlet of the vibrating screen enter a crusher along a chute, and a material outlet of the crusher and a small particle outlet of the vibrating screen are connected with a belt and communicated with a granulator; the dust-containing tail gas of the granulator, the bucket elevator, the vibrating screen and the crusher is connected with a centrifugal rotary gas-solid separator through a draught fan, and a dust outlet of the centrifugal rotary gas-solid separator is connected with the top of the synthesis reactor.
In the device, the ammonium sulfate conveyor adopts a heating screw conveyor, and a chute of the heating screw conveyor is communicated with the top of the pre-reactor, so that the effects of conveying, metering and preheating can be met simultaneously.
In the device, the mixed liquid outlet at the lower part of the pre-reactor is communicated with the inlet of the high-shear homogenizing pump, and the outlet of the high-shear homogenizing pump is communicated with the top of the pre-reactor, so that the reaction raw materials are promoted to be fully mixed.
In the above device, the granulator is one of drum granulation, fluidized bed granulation or drum fluidized bed granulation.
In the device, the tail gas treatment unit adopts a centrifugal rotary type gas-solid separator to perform dust treatment.
The utility model has the advantages that:
(1) the production device and the process of the utility model thoroughly solve the problems of difficult granulation, uneven content, unstable quality and the like of the product in the production of ammonium nitrate-sulfate compound fertilizer.
(2) The utility model discloses the key is the best synthesis technology route of having found ammonium nitrate and ammonium sulfate and having carried out chemical reaction, and the reaction temperature of ammonium nitrate and ammonium sulfate, time all produce profitable influence to follow-up granulation technology to enable the final product to have higher intensity.
(3) The utility model discloses the high shear homogenizing pump that adopts can make follow-up granulation easier, and product content is even.
(4) The utility model discloses an add specific amount magnesium sulfate, the product quality who obtains is more stable.
(5) The product produced by the utility model meets the anti-knock requirement and can be directly used as a chemical fertilizer.
Drawings
FIG. 1 is a schematic view of the apparatus for producing ammonium nitrate-sulfur compound fertilizer.
In the figure: 1 is an ammonium sulfate conveyor, 2 is an ammonium nitrate meter, 3 is a pre-reactor, 4 is a stirrer, 5 is a high-shear homogenizing pump, 6 is a synthesis reactor, 7 is a magnesium sulfate meter, 8 is a feeding tank, 9 is a granulating pump, 10 is a granulator, 11 is a bucket elevator, 12 is a vibrating screen, 13 is a powder cooler, 14 is a crusher, 15 is a packaging device, and 16 is a centrifugal cyclone separator; a is ammonium sulfate solid, B is ammonium nitrate molten liquid, and C is magnesium sulfate.
Detailed Description
As shown in fig. 1, the utility model provides a production device of ammonium nitrate-sulfur compound fertilizer, which comprises a feeding unit, a mixing reaction unit, a granulation unit, a product cooling unit and a tail gas treatment unit;
the feeding unit comprises an ammonium sulfate conveyor 1, an ammonium nitrate meter 2, a magnesium sulfate meter 7 and a feeding trough 8;
the mixed reaction unit comprises a pre-reactor 3 and a synthesis reactor 6, wherein a first-stage pre-mixing reaction is carried out in the pre-reactor 3, and a second-stage high-temperature synthesis reaction is carried out in the synthesis reactor 6; a stirrer 4 is arranged in the pre-reactor 3, the top inlet is respectively connected with the ammonium sulfate conveyor 1 and the ammonium nitrate meter 2, the upper mixed liquid outlet of the pre-reactor 3 is connected with the synthesis reactor 6, the stirrer 4 is arranged in the synthesis reactor 6, and the top inlet is connected with the magnesium sulfate meter 7;
the granulating unit comprises a granulating pump 9, a granulator 10, a crusher 14, a vibrating screen 12 and a wrapping device 15; the product cooling unit comprises a powder cooler 13; the tail gas treatment unit comprises a centrifugal cyclone separator 16;
the upper outlet of the synthesis reactor 6 is communicated with the inlet at the top of the feeding trough 8; an outlet at the bottom of the feeding groove 8 is communicated with an inlet of a granulation pump 9; the outlet of the granulating pump 9 is communicated with a feeding pipeline of the granulator 1; the material at the outlet of the granulator 10 enters the bottom of the bucket elevator 11 along a chute, the material from the top of the bucket elevator 11 enters the vibrating screen 12 along the chute, the qualified particles at the outlet of the vibrating screen 12 enter the upper part of the powder cooler 13 along the chute, the outlet of the powder cooler 13 is connected with a finished product belt to lead to the wrapping device 15, and the finished product is wrapped by the wrapping device 15 and then packaged; oversized particles at the outlet of the vibrating screen 12 enter the crusher 14 along a chute, and a material outlet of the crusher 14 and a small particle outlet of the vibrating screen 12 are connected with a belt and communicated with the granulator 10; the dust-containing tail gas of the granulator 10, the bucket elevator 11, the vibrating screen 12 and the crusher 14 is connected with a centrifugal cyclone separator 16 through a draught fan, and a dust outlet of the centrifugal cyclone separator 16 is connected with the top of the synthesis reactor 6.
In the device, the ammonium sulfate conveyor 1 adopts a heating screw conveyor, and a chute of the heating screw conveyor is communicated with the top of the pre-reactor 3, so that the effects of conveying, metering and preheating can be met simultaneously.
In the device, the outlet of the mixed liquid at the lower part of the pre-reactor 3 is communicated with the inlet of the high-shear homogenizing pump 5, and the outlet of the high-shear homogenizing pump 5 is communicated with the top of the pre-reactor 3, so that the reaction raw materials are promoted to be fully mixed.
In the above device, the granulator 10 adopts one of drum granulation, fluidized bed granulation or drum fluidized bed granulation.
In the device, the tail gas treatment unit adopts a centrifugal cyclone separator 16 for dust treatment.
The production process flow of the ammonium sulfate nitrate compound fertilizer provided by the utility model is as follows: heating a spiral conveyor to send ammonium sulfate solid with the temperature of 60-70 ℃ and solution to a pump, sending 93-95% ammonium nitrate molten liquid with the temperature of 130-140 ℃ to a pre-reactor simultaneously, fully mixing a mixture with the molar ratio of ammonium sulfate to ammonium nitrate being 0.65-1: 1 by a stirring paddle in the pre-reactor and a high-shear homogenizing pump communicated with the outside, carrying out primary reaction, controlling the temperature of the pre-reactor to be 130-140 ℃, overflowing the mixture to a synthesis reactor from the upper part of the pre-reactor after 30 min-1 h, sending magnesium sulfate solid with the weight of 1-1.2% of the mixture to the synthesis reactor for further reaction to generate slurry, controlling the temperature of the reactor to be 150-160 ℃, sending the prepared slurry to a feeding tank from the upper part of the synthesis reactor after 30 min-1 h, sending the slurry from a granulator to the granulator by a pump for granulation, sending the discharged particles to a vibrating screen by a bucket elevator, and (3) cooling the qualified granules by a powder cooler, then sending the granules into a packaging system for bagging and packaging, and returning the oversize granules and the undersize granules to a granulator for use as seed crystals after crushing.
Tail gas generated by the granulator, the bucket elevator, the vibrating screen and the crusher is treated by a centrifugal rotary gas-solid separator and then is discharged after reaching standards, and separated dust is sent to the synthesis reactor for recycling.
The utility model discloses specific process flow is as follows:
a production method of ammonium sulfate-ammonium nitrate compound fertilizer adopts ammonium sulfate solid and ammonium nitrate molten liquid with the molar ratio of ammonium sulfate to ammonium nitrate of 0.65-1: 1, and magnesium sulfate solution is added, wherein the dosage of magnesium sulfate is 1-1.2% of the total weight of ammonium sulfate, ammonium nitrate and magnesium sulfate; the mixture is reacted through the first-stage premixing reaction and the second-stage high-temperature synthesis reaction to form slurry, and then the slurry is sprayed, cooled and solidified to form a granular product.
The production method specifically comprises the following steps:
(1) adding ammonium nitrate molten liquid and ammonium sulfate solid into a pre-reactor for mixing, wherein the molar ratio of ammonium sulfate to ammonium nitrate is 0.65-1: 1, the temperature of the mixture is controlled to be 130-140 ℃, stirring is carried out for 30 min-1 h, and continuous shearing emulsification circulation is carried out through a high-shearing homogenizing pump which is connected and communicated with the outside of the pre-reactor;
(2) overflowing the stirred and sheared mixed solution from the pre-reactor into a synthesis reactor, adding a magnesium sulfate solution into the synthesis reactor, and reacting to generate granulation mother liquor;
(3) granulating mother liquor (with the concentration of 98-99.5%) overflowing from the synthesis reactor enters a feeding trough;
(4) the granulating mother liquor from the feeding groove enters a granulator, and a round granular product is generated by the granulator;
(5) sieving the granules from the granulator by a vibrating screen to remove oversize and undersize granules, and cooling the qualified granules in a powder cooler and packaging; oversize particles from the vibrating screen enter a crusher along a chute, and crushed materials and undersize particles from the vibrating screen return to a granulator through a belt to be used as seed crystals;
(6) tail gas generated by the granulator, the bucket elevator, the vibrating screen and the crusher is subjected to dust treatment through a centrifugal rotary gas-solid separator; the ammonium nitrate sulfate powder separated by the centrifugal rotary gas-solid separator is returned to the synthesis reactor for recycling.
In the production method, the ammonium nitrate is a melt liquid with the mass concentration of 93-95%, and the magnesium sulfate is a solution with the mass concentration of 25%.
In the production method, the synthesis reactor is heated through the inner coil pipe and the outer half pipe, the temperature is controlled to be 150-160 ℃, and the reaction time is 30 min-1 h.
In the production method, the temperature of the raw material ammonium nitrate is 130-140 ℃, the temperature of the raw material ammonium sulfate solid is preheated to 60-70 ℃, the temperature of the feeding trough is 150-160 ℃, the temperature of granules discharged from the granulator is 85-95 ℃, and the temperature of qualified granules discharged from the powder cooler is 30-40 ℃.
Claims (5)
1. The utility model provides a production device of ammonium nitrate sulfate compound fertilizer which characterized in that: the device comprises a feeding unit, a mixing reaction unit, a granulation unit, a product cooling unit and a tail gas treatment unit;
the feeding unit comprises an ammonium sulfate connecting conveyor, an ammonium nitrate meter, a magnesium sulfate meter and a feeding groove;
the mixed reaction unit comprises a pre-reactor and a synthesis reactor, wherein a first-stage pre-mixing reaction is carried out in the pre-reactor, and a second-stage high-temperature synthesis reaction is carried out in the synthesis reactor; a stirrer is arranged in the pre-reactor, a top inlet is respectively connected with the ammonium sulfate conveyor and the ammonium nitrate meter, an upper mixed liquid outlet of the pre-reactor is connected with the synthesis reactor, the stirrer is arranged in the synthesis reactor, and a top inlet is connected with the magnesium sulfate meter;
the granulation unit comprises a granulation pump, a granulator, a crusher, a vibrating screen and a wrapping device; the product cooling unit comprises a powder cooler; the tail gas treatment unit comprises a centrifugal rotary type gas-solid separator;
an upper outlet of the synthesis reactor is communicated with an inlet at the top of the feeding trough; an outlet at the bottom of the feeding groove is communicated with an inlet of the granulation pump; the outlet of the granulating pump is communicated with a feeding pipeline of the granulating machine; the material at the outlet of the granulator enters the bottom of the bucket elevator along a chute, the material coming out of the top of the bucket elevator enters a vibrating screen along the chute, the qualified particles at the outlet of the vibrating screen enter the upper part of a powder cooler along the chute, the outlet of the powder cooler is connected with a finished product belt to lead to a wrapping device, and the finished product is wrapped by the wrapping device and then packaged; oversized particles at the outlet of the vibrating screen enter a crusher along a chute, and a material outlet of the crusher and a small particle outlet of the vibrating screen are connected with a belt and communicated with a granulator; the dust-containing tail gas of the granulator, the bucket elevator, the vibrating screen and the crusher is connected with a centrifugal rotary gas-solid separator through a draught fan, and a dust outlet of the centrifugal rotary gas-solid separator is connected with the top of the synthesis reactor.
2. The apparatus for producing ammonium nitrate-sulfur compound fertilizer as claimed in claim 1, characterized in that: the ammonium sulfate conveyer adopts a heating screw conveyer, and a chute of the heating screw conveyer is communicated with the top of the pre-reactor, so that the effects of conveying, metering and preheating can be met simultaneously.
3. The apparatus for producing ammonium nitrate-sulfur compound fertilizer as claimed in claim 1, characterized in that: the mixed liquid outlet at the lower part of the pre-reactor is communicated with the inlet of the high-shear homogenizing pump, and the outlet of the high-shear homogenizing pump is communicated with the top of the pre-reactor, so that the reaction raw materials are promoted to be fully mixed.
4. The apparatus for producing ammonium nitrate-sulfur compound fertilizer as claimed in claim 1, characterized in that: the granulator adopts one of roller granulation, fluidized bed granulation or roller fluidized bed granulation.
5. The apparatus for producing ammonium nitrate-sulfur compound fertilizer as claimed in claim 1, characterized in that: the tail gas treatment unit adopts a centrifugal rotary type gas-solid separator to carry out dust treatment.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110818475A (en) * | 2019-12-13 | 2020-02-21 | 太原柏悟化工科技有限公司 | Production method and production device of ammonium nitrate-sulfur compound fertilizer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110818475A (en) * | 2019-12-13 | 2020-02-21 | 太原柏悟化工科技有限公司 | Production method and production device of ammonium nitrate-sulfur compound fertilizer |
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