CN106810321B

CN106810321B - Equipment and method for producing sulfur-containing phosphate fertilizer by adding liquid sulfur into gas phase

Info

Publication number: CN106810321B
Application number: CN201710044299.4A
Authority: CN
Inventors: 魏正坤; 王煜; 王永宏; 韦伟文; 陈鑫; 李财红; 王婷婷; 王毕健
Original assignee: Yunnan Three Circles Sinochem Fertilizers Co Ltd
Current assignee: Yunnan Three Circles Sinochem Fertilizers Co Ltd
Priority date: 2017-01-21
Filing date: 2017-01-21
Publication date: 2021-01-01
Anticipated expiration: 2037-01-21
Also published as: CN106810321A

Abstract

The invention provides equipment and a method for producing a sulfur-containing phosphate fertilizer by adding liquid sulfur into a gas phase, which comprises a granulator, a dryer, a first gas phase chamber and a cyclone separator, wherein the granulator, the dryer, the first gas phase chamber and the cyclone separator are sequentially connected; the first gas phase chamber is internally provided with a first liquid sulfur nozzle. Granulating and drying the phosphate fertilizer, blowing the phosphate fertilizer dust into a first gas phase chamber by using a dryer, utilizing liquid sulfur sprayed out by a first liquid sulfur spray nozzle to bond with the phosphate fertilizer dust to form sulfur and phosphorus particles, blowing the sulfur and phosphorus particles and the gas phase to a cyclone separator, centrifuging and settling, conveying the sulfur and phosphorus particles back to a granulator, and mixing the sulfur and phosphorus particles with the phosphate fertilizer in the granulator to obtain the sulfur-containing phosphate fertilizer; and the separated gas phase is conveyed to a tail gas absorber for absorption and purification and then is discharged. The invention has the beneficial effects that: simple process, high balling rate, less returned material, less dust, safety and environmental protection.

Description

Equipment and method for producing sulfur-containing phosphate fertilizer by adding liquid sulfur into gas phase

Technical Field

The invention belongs to the technical field of phosphate fertilizer production, and particularly relates to equipment and a method for producing a sulfur-containing phosphate fertilizer by adding liquid sulfur into a gas phase.

Background

The sulfur is one of essential main nutrient elements for plants, can directly provide nutrition for crops, and can also improve the utilization rate of nitrogen and phosphorus of the crops, thereby increasing the yield of the crops. As agricultural productivity increases, the demand of crops for all nutrient elements also increases. Particularly, after the fertilization levels of nitrogen, phosphorus and potassium are increased to meet the high-yield requirement of crops, sulfur becomes the fourth main nutrient element of the crops. The sulfur dioxide is always the main source of sulfur required by the growth of crops for many years, and the sulfur which can be provided for the crops is less and less as the discharge amount of the sulfur dioxide is reduced year by year, and the trend is increasingly severe along with the enhancement of the environmental pollution treatment. Moreover, as the application amount of high-concentration fertilizers increases and the organic matter level of soil decreases, the decrease of the sulfur content in the soil becomes an important factor for restricting the improvement of the crop yield. Ammonium sulfate and calcium superphosphate are sulfur-containing fertilizers widely used in the world at present, about 1000 ten thousand tons of sulfur are applied every year, and account for 83 percent of the total amount of sulfur applied. Due to the limited yield of these conventional sulphur-containing fertilizers, the supply thereof will decrease with competition of fertilizer varieties. Such fertilizers, including potassium sulfate, are defined as "sulfate-based fertilizers" and another type of sulfur fertilizer is "sulfur-based sulfur fertilizers". In recent years, new sulfur and sulfur fertilizers have attracted much attention due to the continuous improvement of production technology.

According to estimation, the area of the sulfur-deficient soil in China reaches 40 ten thousand square kilometers, the demand of the sulfur fertilizer reaches 120 ten thousand tons, and the yield of the crops can be increased by 2400 ten thousand tons by reasonably applying the sulfur fertilizer, and the loss of the nitrogen fertilizer can be reduced by 120 ten thousand tons. However, it should be noted that the recommended usage amount of the Chinese sulfur fertilizer is generally 2 to 8 g/m, and should be changed according to the soil sulfur fertility and different requirements of different crops on sulfur, limited sulfur fertilizer resources must be more effectively utilized, so that regional sulfur deficiency is prevented, unreasonable use of the sulfur fertilizer is prevented, production, distribution and use of the sulfur fertilizer are controlled in a planned way, and balanced fertilization is promoted to improve fertilizer efficiency.

For areas with serious sulfur deficiency, 10 or even more than 18 sulfur nutrients are needed in the ammonium phosphate fertilizer, the special ammonium phosphate product adopts the traditional sulfate to provide nutrients and cannot meet the requirements, as is known, the sulfur nutrients are calculated by the content of elemental sulfur, the salt extracting efficiency of the sulfate is too low, and the addition of excessive sulfate in the ammonium phosphate can affect the granulation of the ammonium phosphate product, the balling rate is low, the dust is large, the returned materials are more and the like, so for producing sulfur-containing or high-sulfur ammonium phosphate products, the most economical and rapid mode is to add sulfur to improve the sulfur content of the ammonium phosphate product. How to safely and effectively add sulfur into an ammonium phosphate fertilizer product becomes a problem which must be solved currently.

Disclosure of Invention

The invention aims to solve the problems that ammonium phosphate granulation is influenced by adding sulfate in the prior art, the ammonium phosphate balling rate is reduced, dust is large, returned materials are more and the like, and provides equipment and a method for producing a sulfur-containing phosphate fertilizer by adding liquid sulfur into a gas phase.

The invention is realized by the following technical scheme: the granulator, the dryer, the screening machine, the fluidized bed and the wrapping cylinder are sequentially connected along the conveying direction of the phosphate fertilizer; in addition, the air outlet of the dryer is connected with the air inlet of a first gas phase chamber, the air outlet of the first gas phase chamber is connected with the air inlet of a cyclone separator, and the material outlet of the cyclone separator is connected with the granulator through a material returning belt; and a first liquid sulfur spray head is arranged in the first gas phase chamber and is connected with a first flowmeter.

In the present invention, preferably, the outlet of the fluidized bed is connected to the inlet of a second gas phase chamber, and the outlet of the second gas phase chamber is connected to the inlet of the cyclone separator; and a second liquid sulfur spray head is arranged in the second gas phase chamber and is connected with a second flowmeter.

In the present invention, preferably, an air outlet of the granulator is connected to an air inlet of a third gas phase chamber, and an air outlet of the third gas phase chamber is connected to an air inlet of the cyclone separator; and a third liquid sulfur spray head is arranged in the third gas phase chamber and is connected with a third flowmeter.

In the present invention, it is preferable that the first gas phase chamber, the second gas phase chamber, and the third gas phase chamber have a cylindrical structure having an inner diameter of 1500mm to 2000 mm; the first liquid sulfur sprayer, the second liquid sulfur sprayer and the third liquid sulfur sprayer are all spiral sprayers.

Preferably, the gas outlet of the cyclone separator is connected with the gas inlet of the tail gas absorber, and the tail gas absorber is provided with a vent pipe.

A method for producing a sulfur-containing phosphate fertilizer by adding liquid sulfur into a gas phase comprises the following steps:

s1, conveying a phosphate fertilizer to the granulator for granulation, and then conveying the granulated phosphate fertilizer to the dryer for drying, wherein the dryer blows gas phase containing phosphate fertilizer dust to the first gas phase chamber;

s2, introducing liquid sulfur into the first liquid sulfur nozzle, adjusting the first flow meter to control the flow of the liquid sulfur, spraying liquid sulfur atomized particles into the first gas phase chamber by the first liquid sulfur nozzle, and bonding the liquid sulfur atomized particles and phosphate fertilizer dust in a gas phase to form sulfur-phosphorus particles;

s3, the sulfur and phosphorus particles and the gas phase in the first gas phase chamber are blown into the cyclone separator, and are separated through centrifugation and sedimentation;

and S4, conveying the separated sulfur and phosphorus particles back to the granulator through the material returning belt, and mixing the sulfur and phosphorus particles with the phosphate fertilizer in the granulator to obtain the sulfur-containing phosphate fertilizer.

The present invention preferably further comprises the steps of:

s5, conveying the sulfur-containing phosphate fertilizer from the granulator to the dryer, and conveying the sulfur-containing phosphate fertilizer from the dryer to the screening machine for screening;

s6, conveying the screened sulfur-containing phosphate fertilizer to the fluidized bed for fluidization treatment;

and S7, conveying the fluidized sulfur-containing phosphate fertilizer to the wrapping drum for particle wrapping to obtain a finished product.

The present invention preferably further comprises the steps of:

s8, blowing gas phase containing phosphate fertilizer dust in the fluidized bed to the second gas phase chamber;

s9, introducing liquid sulfur into the second liquid sulfur nozzle, adjusting the second flowmeter to control the flow of the liquid sulfur, spraying liquid sulfur atomized particles into the second gas phase chamber by the second liquid sulfur nozzle, and bonding the liquid sulfur atomized particles with phosphate fertilizer dust in a gas phase to form sulfur-phosphorus particles;

s10, blowing sulfur and phosphorus particles and a gas phase in the second gas phase chamber into the cyclone separator, and separating the sulfur and phosphorus particles and the gas phase in the second gas phase chamber through centrifugation and sedimentation;

s11, blowing gas phase containing phosphate fertilizer dust in the granulator to the third gas phase chamber;

s12, introducing liquid sulfur into the third liquid sulfur nozzle, adjusting the third liquid sulfur nozzle to control the flow of the liquid sulfur, spraying liquid sulfur atomized particles into the third gas phase chamber by the third liquid sulfur nozzle, and bonding the liquid sulfur atomized particles and phosphate fertilizer dust in a gas phase to form sulfur-phosphorus particles;

s13, the sulfur and phosphorus particles and the gas phase in the third gas phase chamber are blown to the cyclone separator, and the sulfur and phosphorus particles and the gas phase in the third gas phase chamber are separated through centrifugation and sedimentation.

The present invention preferably further comprises the steps of:

s14, conveying the gas phase separated in the cyclone separator into the tail gas absorber, and discharging the gas phase from the emptying pipe after absorption and purification.

In the present invention, it is preferable that the atomized liquid sulfur particles have a size of 30 to 70 μm, and the gas flow velocities in the first, second, and third gas phase chambers are 18 to 31 m/s.

After being granulated by a granulator, the phosphate fertilizer is conveyed to a dryer to be dried by hot air. The gas phase discharged by the dryer contains a large amount of phosphate fertilizer dust, the phosphate fertilizer dust is blown into a first gas phase chamber, fine liquid sulfur atomized particles are sprayed out by a first liquid sulfur spray nozzle, the liquid sulfur atomized particles and the phosphate fertilizer dust are bonded to form sulfur and phosphorus particles, and the sulfur and phosphorus particles and the gas phase are blown into a cyclone separator. The sulfur and phosphorus particles are settled down under the centrifugal action of the cyclone separator, are conveyed back to the granulator through a material returning belt and are mixed with phosphate fertilizer in the granulator to obtain sulfur-containing phosphate fertilizer; the separated gas phase is conveyed to a tail gas absorber for absorption and purification, and the tail gas reaching the emission standard is discharged through a vent pipe, so that the environment is not polluted.

And (3) continuously conveying the sulfur-containing phosphate fertilizer to a screening machine by a granulator for screening, conveying the sulfur-containing phosphate fertilizer with the particle size meeting the process requirement to a fluidized bed for fluidization treatment to enable the sulfur-containing phosphate fertilizer to meet the particle size requirement, and finally conveying the sulfur-containing phosphate fertilizer to a wrapping drum for surface layer wrapping of the granular sulfur-containing phosphate fertilizer to obtain a finished product.

In the process of carrying out fluidization treatment on the sulfur-containing phosphate fertilizer, a second gas phase chamber can be further arranged, so that gas phase containing phosphate fertilizer dust blown out from the fluidized bed is sent to the second gas phase chamber for secondary spraying, fine liquid sulfur atomized particles are sprayed out by a second liquid sulfur spray head, the liquid sulfur atomized particles and the phosphate fertilizer dust are bonded to form sulfur and phosphorus particles, and the sulfur and phosphorus particles and the gas phase are blown to the cyclone separator together. The sulfur and phosphorus particles are settled down under the centrifugal action of the cyclone separator, are conveyed back to the granulator through a material returning belt and are mixed with phosphate fertilizer in the granulator to obtain sulfur-containing phosphate fertilizer; the separated gas phase is conveyed to a tail gas absorber for absorption and purification, and the tail gas reaching the emission standard is discharged through a vent pipe, so that the environment is not polluted.

Gas flow rate of 20X 10 in gas phase chamber⁴m³When the inner diameter of the gas phase chamber is DN2000, the gas flow speed is 20 × 10⁴/3.14×(2/2)²18 m/s; when the inner diameter of the gas phase chamber is DN1500, the gas flow speed is 20 × 10⁴/3.14×(1.5/2)²The gas flow velocity is higher as the gas phase chamber inner diameter is smaller, and the gas phase chamber inner diameter is in inverse proportion to the gas flow velocity.

The liquid sulfur spray head adopts a spiral spray head, the size of liquid sulfur atomized particles is controlled to be 30-70 micrometers, the liquid sulfur is sprayed to a granulator, a dryer and a fluidized bed outlet gas phase chamber through the dispersion effect of the spray nozzles, the liquid sulfur particles are all blown to a cyclone dust collector in the same direction through air flow which is more than 15 m/s from bottom to top, then the liquid sulfur particles are conveyed to the granulator through a material returning belt, and a sulfur-containing phosphate fertilizer product is obtained through granulation and drying.

When the addition amount of liquid sulfur is more than 35g/m per hour³And thus explosion may occur, the maximum amount of liquid sulfur added per hour to each outlet gas phase chamber of the dryer, fluidized bed, granulator is 35 g/m/h³×20×10⁴7 tons. The maximum amount of liquid sulfur added into a single gas phase pipe of the ammonium phosphate device is 3.5m³X 1.7788 ═ 6.2 tons, if the total sulfur addition exceeds 3.5m per hour³In this case, it is necessary to add the powder at a plurality of addition points (a dryer or a fluidized bed or a granulator) in order to prevent dust explosion.

The liquid sulfur is completely in a gaseous state after being sprayed into the gas phase pipeline and cannot be changed into a liquid state, and the liquid sulfur is calculated according to the heat balance: maximum amount of liquid sulfur added x specific heat x temperature difference is equal to maximum amount of gas phase added x specific heat x temperature difference, then 6.2 x 10³kg/h×0.96kJ/kg·℃×(140-85)℃＝20×10⁴m³/h×0.95kg/m³×0.255kJ/kg·℃×(X-85)℃

And X is the gas temperature after the gas in the gas phase chamber is heated by the liquid sulfur cooling and heat release, and then the maximum temperature of the gas in the gas phase chamber is 92 ℃. If the temperature in the gas phase chamber is higher than 114 ℃, the liquid sulfur granules can be changed into liquid, and the maximum temperature of gas in the gas phase chamber is 92 ℃, so that the liquid sulfur granules in the gas phase chamber are all in gas state, all the liquid sulfur granules are blown to a cyclone dust collector in the same direction through gas flow which is higher than 15 m/s from bottom to top, and then are conveyed to a granulator through a material returning belt, and a sulfur-containing phosphate fertilizer product is obtained through granulation and drying.

The invention can at least achieve one of the following beneficial effects:

1. the process is simple, and the sulfur-containing phosphate fertilizer can be obtained under the condition of slightly adjusting the existing production line;

2. the normal granulation process of ammonium phosphate is not influenced, and the pelletizing rate of the sulfur-containing phosphate fertilizer is high;

3. spraying liquid sulfur atomized particles, not only inhibits dust pollution in the production process, but also improves the yield of phosphate fertilizer;

4. the production efficiency is high, and the returned material is less;

5. the production process is safe, the spraying amount of liquid sulfur is regulated through a flowmeter, the dust content of the phosphate fertilizer is controlled, and the sulfur-sulfur combustion and explosion risks are avoided;

6. the ammonium phosphate products with different sulfur contents can be produced according to the fertilizer requirements, and the original ammonium phosphate fertilizer nutrient cannot be excessively diluted;

7. the tail gas emission does not pollute the environment, and is safe and environment-friendly.

Drawings

FIG. 1 is a schematic flow diagram of the present invention.

The serial numbers and corresponding names in the drawings are as follows:

the device comprises a granulator 1, a dryer 2, a first gas phase chamber 3, a cyclone separator 4, a material returning belt 5, a first liquid sulfur spray head 6, a first flow meter 7, a sieving machine 8, a fluidized bed 9, a wrapping cylinder 10, a second gas phase chamber 11, a second liquid sulfur spray head 12, a second flow meter 13, a tail gas absorber 14, a third gas phase chamber 15, a third liquid sulfur spray head 16 and a third flow meter 17.

Detailed Description

The invention is further explained below with reference to the drawings.

As shown in figure 1, a device for producing a sulfur-containing phosphate fertilizer by adding liquid sulfur into a gas phase is characterized in that a granulator 1, a dryer 2, a screening machine 8, a fluidized bed 9 and a wrapping cylinder 10 are connected in sequence along the conveying direction of the phosphate fertilizer.

Example 1

An air outlet of the dryer 2 is connected with an air inlet of a first gas phase chamber 3, an air outlet of the first gas phase chamber 3 is connected with an air inlet of a cyclone separator 4, and a material outlet of the cyclone separator 4 is connected with the granulator 1 through a material returning belt 5; a first liquid sulfur nozzle 6 is arranged in the first gas phase chamber 3, and the first liquid sulfur nozzle 6 is connected with a first flow meter 7.

The method comprises the following steps:

s1, conveying a phosphate fertilizer to the granulator 1 for granulation, and then conveying the granulated phosphate fertilizer to the dryer 2 for drying, wherein the dryer 2 blows gas phase containing phosphate fertilizer dust to the first gas phase chamber 3;

s2, introducing liquid sulfur into the first liquid sulfur nozzle 6, adjusting the first flow meter 7 to control the flow of the liquid sulfur, spraying liquid sulfur atomized particles into the first gas phase chamber 3 by the first liquid sulfur nozzle 6, and bonding the liquid sulfur atomized particles and phosphate fertilizer dust in a gas phase to form sulfur-phosphorus particles;

s3, the sulfur and phosphorus particles and the gas phase in the first gas phase chamber 3 are blown to the cyclone separator 4, and are separated through centrifugation and sedimentation;

and S4, conveying the separated sulfur and phosphorus particles back to the granulator 1 through the material returning belt 5, and mixing the sulfur and phosphorus particles with the phosphate fertilizer in the granulator 1 to obtain the sulfur-containing phosphate fertilizer.

Example 2

The gas outlet of the fluidized bed 9 is connected with the gas inlet of a second gas phase chamber 11, and the gas outlet of the second gas phase chamber 11 is connected with the gas inlet of the cyclone separator 4; a second liquid sulfur shower head 12 is provided in the second gas phase chamber 11, and the second liquid sulfur shower head 12 is connected to a second flowmeter 13.

The method comprises the following steps:

s4, conveying the separated sulfur and phosphorus particles back to the granulator 1 through the material returning belt 5, and mixing the sulfur and phosphorus particles with a phosphate fertilizer in the granulator 1 to obtain a sulfur-containing phosphate fertilizer;

s5, conveying the sulfur-containing phosphate fertilizer from the granulator 1 to the dryer 2, and conveying the sulfur-containing phosphate fertilizer from the dryer 2 to the screening machine 8 for screening;

s6, conveying the screened sulfur-containing phosphate fertilizer to the fluidized bed 9 for fluidization treatment;

and S7, conveying the fluidized sulfur-containing phosphate fertilizer to the wrapping drum 10 for particle wrapping to obtain a finished product.

Example 3

The air outlet of the granulator 1 is connected with the air inlet of a third gas-phase chamber 15, and the air outlet of the third gas-phase chamber 15 is connected with the air inlet of the cyclone separator 4; a third liquid sulfur shower head 16 is provided in the third gas phase chamber 15, and the third liquid sulfur shower head 16 is connected to a third flow meter 17.

The method comprises the following steps:

s7, conveying the sulfur-containing phosphate fertilizer subjected to fluidization treatment to the wrapping drum 10 for particle wrapping to obtain a finished product;

s8, blowing gas phase containing phosphate fertilizer dust in the fluidized bed 9 to the second gas phase chamber 11;

s9, introducing liquid sulfur into the second liquid sulfur nozzle 12, adjusting the second flow meter 13 to control the flow of the liquid sulfur, spraying liquid sulfur atomized particles into the second gas phase chamber 11 by the second liquid sulfur nozzle 12, and bonding the liquid sulfur atomized particles and phosphate fertilizer dust in a gas phase to form sulfur-phosphorus particles;

s10, the sulfur and phosphorus particles and the gas phase in the second gas phase chamber 11 are blown to the cyclone separator 4, and are separated through centrifugation and sedimentation;

s11, blowing gas phase containing phosphate fertilizer dust in the granulator 1 to the third gas phase chamber 15;

s12, introducing liquid sulfur into the third liquid sulfur nozzle 16, adjusting the third liquid sulfur nozzle 16 to control the flow of the liquid sulfur, spraying liquid sulfur atomized particles into the third gas phase chamber 15 by the third liquid sulfur nozzle 16, and bonding the liquid sulfur atomized particles and phosphate fertilizer dust in a gas phase to form sulfur-phosphorus particles;

s13, the sulfur and phosphorus particles and the gas phase in the third gas phase chamber 15 are blown to the cyclone separator 4, and are separated through centrifugation and sedimentation.

Example 4

The first gas phase chamber 3, the second gas phase chamber 11, and the third gas phase chamber 15 each have a cylindrical structure with an inner diameter of 1500 mm; the first liquid sulfur sprayer 6, the second liquid sulfur sprayer 12 and the third liquid sulfur sprayer 16 are all spiral sprayers.

The method comprises the following steps:

s13, the sulfur and phosphorus particles and the gas phase in the third gas phase chamber 15 are blown to the cyclone separator 4, and are separated through centrifugation and sedimentation;

s14, conveying the gas phase separated in the cyclone separator 4 to the tail gas absorber 14, absorbing and purifying the gas phase, and discharging the gas phase from the vent pipe.

Example 5

The first gas phase chamber 3, the second gas phase chamber 11, and the third gas phase chamber 15 each have a cylindrical structure having an inner diameter of 2000 mm; the first liquid sulfur sprayer 6, the second liquid sulfur sprayer 12 and the third liquid sulfur sprayer 16 are all spiral sprayers.

The gas outlet of the cyclone separator 4 is connected with the gas inlet of the tail gas absorber 14, and the tail gas absorber 14 is provided with a vent pipe.

The method comprises the following steps:

Preparing 5% sulphur-containing ammonium phosphate fertilizer with a liquid sulphur flow of 1.5m³The inner diameters of the first gas phase chamber 3, the second gas phase chamber 11 and the third gas phase chamber 15 are all 2000mm, the first liquid sulfur spray nozzle 6, the second liquid sulfur spray nozzle 12 and the third liquid sulfur spray nozzle 16 are all spiral spray nozzles, the size of liquid sulfur atomized particles is 70 mu m, and the gas flow velocities in the first gas phase chamber 3, the second gas phase chamber 11 and the third gas phase chamber 15 are all 18 m/s.

The analysis result of the sulfur-containing phosphate fertilizer is as follows:

example 6

The method comprises the following steps:

Preparing 8% sulphur-containing ammonium phosphate fertilizer with a liquid sulphur flow of 2.5m³H, inside of the first gas phase chamber 3, the second gas phase chamber 11, the third gas phase chamber 15The diameters of the first liquid sulfur nozzle 6, the second liquid sulfur nozzle 12 and the third liquid sulfur nozzle 16 are all 2000mm, the size of liquid sulfur atomized particles is 50 mu m, and the air flow velocities in the first gas phase chamber 3, the second gas phase chamber 11 and the third gas phase chamber 15 are all 18 m/s.

example 7

The method comprises the following steps:

Preparing a 10% sulphur-containing ammonium phosphate fertilizer with a liquid sulphur flow of 3m³The inner diameters of the first gas phase chamber 3, the second gas phase chamber 11 and the third gas phase chamber 15 are all 2000mm, the first liquid sulfur spray nozzle 6, the second liquid sulfur spray nozzle 12 and the third liquid sulfur spray nozzle 16 are all spiral spray nozzles, the size of liquid sulfur atomized particles is 30 mu m, and the gas flow velocities in the first gas phase chamber 3, the second gas phase chamber 11 and the third gas phase chamber 15 are all 18 m/s.

example 8

The method comprises the following steps:

Preparing ammonium phosphate fertilizer containing 12% of sulfur with liquid sulfur flow of 3.5m³The inner diameters of the first gas phase chamber 3, the second gas phase chamber 11 and the third gas phase chamber 15 are all 2000mm, the first liquid sulfur spray nozzle 6, the second liquid sulfur spray nozzle 12 and the third liquid sulfur spray nozzle 16 are all spiral spray nozzles, the size of liquid sulfur atomized particles is 40 mu m, and the air flow velocities in the first gas phase chamber 3, the second gas phase chamber 11 and the third gas phase chamber 15 are all 18 m/s.

example 9

The method comprises the following steps:

Preparation of sulfur-containing compounds15% of ammonium phosphate fertilizer, the liquid sulfur flow is 4.5m³The inner diameters of the first gas phase chamber 3, the second gas phase chamber 11 and the third gas phase chamber 15 are all 2000mm, the first liquid sulfur spray nozzle 6, the second liquid sulfur spray nozzle 12 and the third liquid sulfur spray nozzle 16 are all spiral spray nozzles, the size of liquid sulfur atomized particles is 60 mu m, and the gas flow velocities in the first gas phase chamber 3, the second gas phase chamber 11 and the third gas phase chamber 15 are all 18 m/s.

example 10

The method comprises the following steps:

Preparing 20% sulphur-containing ammonium phosphate fertilizer with liquid sulphur flow of 6.5m³The inner diameters of the first gas phase chamber 3, the second gas phase chamber 11 and the third gas phase chamber 15 are all 2000mm, the first liquid sulfur spray nozzle 6, the second liquid sulfur spray nozzle 12 and the third liquid sulfur spray nozzle 16 are all spiral spray nozzles, the size of liquid sulfur atomized particles is 50 mu m, and the air flow velocities in the first gas phase chamber 3, the second gas phase chamber 11 and the third gas phase chamber 15 are all 18 m/s.

example 11

The method comprises the following steps:

The size of the atomized liquid sulfur particles was 30 μm, and the gas flow velocities in the first gas phase chamber 3, the second gas phase chamber 11, and the third gas phase chamber 15 were all 31 m/s.

Example 12

The method comprises the following steps:

The size of the atomized liquid sulfur particles was 70 μm, and the gas flow velocities in the first gas phase chamber 3, the second gas phase chamber 11, and the third gas phase chamber 15 were all 31 m/s.

The specific working principle of the invention is as follows:

after being granulated by the granulator 1, the phosphate fertilizer is conveyed to the dryer 2 to be dried by hot air. The gas phase discharged from the dryer 2 contains a large amount of phosphate fertilizer dust, the phosphate fertilizer dust is blown into the first gas phase chamber 3, fine liquid sulfur atomized particles are sprayed by the first liquid sulfur spray nozzle 6, the liquid sulfur atomized particles and the phosphate fertilizer dust are bonded to form sulfur and phosphorus particles, and the sulfur and phosphorus particles and the gas phase are blown into the cyclone separator 4. Under the centrifugal action of the cyclone separator 4, sulfur and phosphorus particles are settled down and are conveyed back to the granulator 1 through a material returning belt 5 to be mixed with phosphate fertilizer in the granulator 1 to obtain sulfur-containing phosphate fertilizer; the separated gas phase is conveyed to a tail gas absorber 14 for absorption and purification, and the tail gas reaching the emission standard is discharged through a vent pipe, so that the environment is not polluted.

And (3) continuously conveying the sulfur-containing phosphate fertilizer from the granulator 1 to the screening machine 8 for screening, conveying the sulfur-containing phosphate fertilizer with the particle size meeting the process requirement to the fluidized bed 9 for fluidization treatment to enable the sulfur-containing phosphate fertilizer to meet the granularity requirement, and finally conveying the sulfur-containing phosphate fertilizer to the wrapping barrel 10 for surface layer wrapping of the granular sulfur-containing phosphate fertilizer to obtain a finished product.

In the process of carrying out fluidization treatment on the sulfur-containing phosphate fertilizer, a second gas phase chamber 11 can be further arranged, so that gas phase containing phosphate fertilizer dust blown out from the fluidized bed 9 is sent to the second gas phase chamber 11 for secondary spraying, fine liquid sulfur atomized particles are sprayed out by a second liquid sulfur spray head 12, the liquid sulfur atomized particles and the phosphate fertilizer dust are bonded to form sulfur and phosphorus particles, and the sulfur and phosphorus particles and the gas phase are blown to the cyclone separator 4. Under the centrifugal action of the cyclone separator 4, sulfur and phosphorus particles are settled down and are conveyed back to the granulator 1 through a material returning belt 5 to be mixed with phosphate fertilizer in the granulator 1 to obtain sulfur-containing phosphate fertilizer; the separated gas phase is conveyed to a tail gas absorber 14 for absorption and purification, and the tail gas reaching the emission standard is discharged through a vent pipe, so that the environment is not polluted.

The above-mentioned embodiments are only preferred embodiments of the present invention, and are not intended to limit the technical solutions of the present invention, and the present invention may have various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications should be construed as falling within the scope of the present invention as claimed.

Claims

1. The utility model provides an equipment that liquid sulphur adds production sulphur phosphorus fertilizer in gaseous phase which characterized in that: the granulator (1), the dryer (2), the screening machine (8), the fluidized bed (9) and the wrapping cylinder (10) are sequentially connected along the conveying direction of the phosphate fertilizer;

in addition, an air outlet of the dryer (2) is connected with an air inlet of the first gas phase chamber (3), an air outlet of the first gas phase chamber (3) is connected with an air inlet of the cyclone separator (4), and a material outlet of the cyclone separator (4) is connected with the granulator (1) through a material returning belt (5);

a first liquid sulfur sprayer (6) is arranged in the first gas phase chamber (3), and the first liquid sulfur sprayer (6) is connected with a first flowmeter (7).

2. The apparatus for producing a sulfur-containing phosphate fertilizer from liquid sulfur added to gas phase as claimed in claim 1, wherein: the gas outlet of the fluidized bed (9) is connected with the gas inlet of a second gas phase chamber (11), and the gas outlet of the second gas phase chamber (11) is connected with the gas inlet of the cyclone separator (4);

and a second liquid sulfur spray head (12) is arranged in the second gas phase chamber (11), and the second liquid sulfur spray head (12) is connected with a second flowmeter (13).

3. The apparatus for producing a sulfur-containing phosphate fertilizer from liquid sulfur added to gas phase as claimed in claim 2, wherein: the air outlet of the granulator (1) is connected with the air inlet of a third gas phase chamber (15), and the air outlet of the third gas phase chamber (15) is connected with the air inlet of the cyclone separator (4);

a third liquid sulfur spray head (16) is arranged in the third gas phase chamber (15), and the third liquid sulfur spray head (16) is connected with a third flow meter (17).

4. The apparatus for producing a sulfur-containing phosphate fertilizer with liquid sulfur added to the gas phase as claimed in claim 3, wherein: the first gas phase chamber (3), the second gas phase chamber (11) and the third gas phase chamber (15) are cylinder structures with the inner diameter of 1500-2000 mm;

the first liquid sulfur sprayer (6), the second liquid sulfur sprayer (12) and the third liquid sulfur sprayer (16) are all spiral sprayers.

5. The apparatus for producing a sulfur-containing phosphate fertilizer with liquid sulfur added to the gas phase as claimed in claim 4, wherein: the gas outlet of the cyclone separator (4) is connected with the gas inlet of the tail gas absorber (14), and the tail gas absorber (14) is provided with a vent pipe.

6. A method for producing a sulfur-containing phosphate fertilizer by adding liquid sulfur into a gas phase is characterized by comprising the following steps: the method comprises the following steps:

s1, conveying a phosphate fertilizer to the granulator (1) for granulation, and then conveying the granulated phosphate fertilizer to the dryer (2) for drying, wherein the dryer (2) blows gas phase containing phosphate fertilizer dust to the first gas phase chamber (3);

s2, introducing liquid sulfur into the first liquid sulfur nozzle (6), adjusting the first flow meter (7) to control the flow of the liquid sulfur, spraying liquid sulfur atomized particles into the first gas phase chamber (3) by the first liquid sulfur nozzle (6), and bonding the liquid sulfur atomized particles with phosphate fertilizer dust in a gas phase to form sulfur-phosphorus particles;

s3, sulfur and phosphorus particles and a gas phase in the first gas phase chamber (3) are blown into the cyclone separator (4), and are separated through centrifugation and sedimentation;

and S4, conveying the separated sulfur and phosphorus particles back to the granulator (1) through the material returning belt (5), and mixing the sulfur and phosphorus particles with a phosphate fertilizer in the granulator (1) to obtain the sulfur-containing phosphate fertilizer.

7. The process for the production of a sulfur-containing phosphate fertilizer with liquid sulfur added to the gas phase as claimed in claim 6, characterized in that: further comprising the steps of:

s5, conveying the sulfur-containing phosphate fertilizer from the granulator (1) to the dryer (2), and conveying the sulfur-containing phosphate fertilizer from the dryer (2) to the screening machine (8) for screening;

s6, conveying the screened sulfur-containing phosphate fertilizer to the fluidized bed (9) for fluidization treatment;

and S7, conveying the sulfur-containing phosphate fertilizer subjected to fluidization treatment to the wrapping drum (10) for particle wrapping to obtain a finished product.

8. The process for the production of a sulfur-containing phosphate fertilizer with liquid sulfur added to the gas phase as claimed in claim 7, characterized in that: further comprising the steps of:

s8, blowing gas phase containing phosphate fertilizer dust in the fluidized bed (9) to the second gas phase chamber (11);

s9, introducing liquid sulfur into the second liquid sulfur spray head (12), adjusting the second flowmeter (13) to control the flow of the liquid sulfur, spraying liquid sulfur atomized particles into the second gas phase chamber (11) by the second liquid sulfur spray head (12), and bonding the liquid sulfur atomized particles with phosphate fertilizer dust in a gas phase to form sulfur-phosphorus particles;

s10, blowing sulfur and phosphorus particles and a gas phase in the second gas phase chamber (11) into the cyclone separator (4), and separating the sulfur and phosphorus particles and the gas phase in the second gas phase chamber (11) through centrifugation and sedimentation;

s11, blowing gas phase containing phosphate fertilizer dust in the granulator (1) to the third gas phase chamber (15);

s12, introducing liquid sulfur into the third liquid sulfur nozzle (16), adjusting the third liquid sulfur nozzle (16) to control the flow of the liquid sulfur, spraying liquid sulfur atomized particles into the third gas phase chamber (15) by the third liquid sulfur nozzle (16), and bonding the liquid sulfur atomized particles with phosphate fertilizer dust in a gas phase to form sulfur-phosphorus particles;

s13, sulfur and phosphorus particles and a gas phase in the third gas phase chamber (15) are blown into the cyclone separator (4), and are separated through centrifugation and sedimentation.

9. The process for the production of a sulfur-containing phosphate fertilizer with liquid sulfur added to the gas phase as claimed in claim 8, characterized in that: further comprising the steps of:

s14, conveying the gas phase separated in the cyclone separator (4) to the tail gas absorber (14), and discharging the gas phase from the emptying pipe after absorption and purification.

10. The process for the production of a sulfur-containing phosphate fertilizer with liquid sulfur added to the gas phase as claimed in claim 9, characterized in that: the size of the liquid sulfur atomized particles is 30-70 μm, and the gas flow speed in the first gas phase chamber (3), the second gas phase chamber (11) and the third gas phase chamber (15) is 18-31 m/s.