CN211069997U

CN211069997U - Nitrophosphate fertilizer slurry melting roller granulation device

Info

Publication number: CN211069997U
Application number: CN201921944647.4U
Authority: CN
Inventors: 李新荣; 王红菲; 杨建东; 董贻胜; 张勇
Original assignee: Tianji Coal Chemical Industry Group Co Ltd
Current assignee: Tianji Coal Chemical Industry Group Co Ltd
Priority date: 2019-11-12
Filing date: 2019-11-12
Publication date: 2020-07-24
Anticipated expiration: 2029-11-12

Abstract

The utility model discloses a nitrophosphate fertilizer slurry melting roller granulating device, which comprises a melting tank, wherein a stirrer and an inner coil pipe are arranged in the melting tank, a half pipe is arranged on the side wall of the melting tank in an enclosing manner, the inlet parts of the half pipe and the inner coil pipe are connected with a saturated steam pipeline, and a regulating valve for controlling the steam quantity of the half pipe and the inner coil pipe is arranged on the saturated steam pipeline; the feed inlet of melting jar is connected with the discharge gate of nitrophosphate fertilizer granule conveyer pipe, and the discharge gate of melting jar passes through the pipeline and is connected with conveying equipment and cylinder granulator in proper order, is equipped with the shower nozzle in the cylinder granulator. The utility model discloses get into the melting jar with the nitrophosphate granule of the production in the former nitrophosphate production process and unqualified returning charge and carry out the melting after, carry the cylinder granulator granulation again through the jacketed pipe that uses low pressure steam as the heating source with the melting slurry, improved the outward appearance and the intensity of product, and the product appearance that obtains is mellow and full, intensity is high, easily dissolve, and the nutrient can be adjusted as required, more can satisfy the market demand.

Description

Nitrophosphate fertilizer slurry melting roller granulation device

Technical Field

The utility model belongs to the technical field of chemical industry system is fertile, a prilling granulator of nitrophosphate fertilizer is related to, especially relate to an use melting state melt thick liquid as cylinder prilling granulator of raw materials.

Background

In the technical field of fertilizer preparation in the chemical industry of China, the common granulation method of the compound fertilizer comprises the following steps: ammonia granulation, high tower granulation manufacturing process, roller granulation process and the like; the roller granulation process is widely applied, but because the surfaces of the material particles obtained by the roller granulator are not smooth, a plurality of pits are formed, and the particle size is not uniform, the risk of pulverization and caking of the phosphorus nitrate type compound fertilizer particles obtained by the roller granulation in the storage and transportation processes is caused.

Disclosure of Invention

In order to solve the pulverization of the compound fertilizer granule of nitric phosphate type among the prior art, the caking problem, the utility model discloses a nitric phosphate fertilizer melts thick liquid cylinder prilling granulator, get into the melting jar with the nitric phosphate fertilizer granule and the unqualified returning charge of the production in the former nitric phosphate fertilizer production process and melt the back, carry the cylinder granulator to granulate again through the double-layered sleeve pipe that uses low pressure steam as the heating source with the melting, the outward appearance and the intensity of product have been improved, and the product appearance that obtains is mellow and full, intensity is high, easily dissolve, the nutrient can be adjusted as required, more can satisfy the market demand.

The technical scheme of the utility model is realized like this:

the utility model discloses a nitrophosphate fertilizer slurry melting roller granulating device, which comprises a melting tank, a conveying device, a roller granulator, a saturated steam pipeline and a steam condensate pipeline, wherein a stirrer and an inner coil pipe are arranged in the melting tank, a half pipe is arranged on the side wall of the melting tank in an enclosing manner, the inlet parts of the half pipe and the inner coil pipe are connected with the saturated steam pipeline, and the saturated steam pipeline is provided with an adjusting valve for controlling the steam quantity of the half pipe and the inner coil pipe; the feed inlet of melting jar is connected with the discharge gate of nitrophosphate fertilizer granule conveyer pipe, the discharge gate of melting jar passes through the conveying line and is connected with conveying equipment and cylinder granulator in proper order be equipped with the shower nozzle in the cylinder granulator, the shower nozzle is equipped with two feed inlets. And (2) conveying the granular nitrophosphate fertilizer into a melting tank, controlling the temperature in the melting tank to be 130-150 ℃, melting the granular materials, pressurizing the obtained molten slurry by conveying equipment, and conveying the molten slurry to a roller granulator for granulation to obtain the compound fertilizer granules. Furthermore, the regulating valve is a pneumatic regulating valve, and the steam amount in the inner coil pipe and the half pipe is regulated through the pneumatic regulating valve, so that the heating temperature of the melting tank is controlled; usually, the melting temperature is controlled to be 130-150 ℃, the nitrophosphate fertilizer starts to melt at 125 ℃, and when the temperature is higher than 150 ℃, the decomposition speed of liquid ammonium nitrate in molten slurry is accelerated, gas ammonia overflows from the molten slurry, and part of the orthophosphoric acid ammonium salt is dehydrated to form non-orthophosphoric acid ammonium salt, so that the content of phosphate is reduced.

As a preferred embodiment, the two feed inlets of the nozzle are respectively a molten slurry inlet communicated with molten slurry and a steam inlet communicated with saturated steam, and the saturated steam is used as a power medium to drive the molten slurry to be granulated in the roller granulator; preferably, 0.3MPa low-pressure saturated steam is used as a power medium; further, the spray head is a PT50 spray head.

Further, the conveying pipeline is a jacketed pipe; the conveying pipeline is a pipeline for molten slurry to pass through and consists of a sleeve and an inner pipe, heat tracing medium steam is fed in the sleeve, and the inner pipe is used for conveying material molten slurry; in order to reduce the scabbing phenomenon of the conveying pipeline to the maximum extent, the temperature difference between the steam in the sleeve and the material in the inner pipe is not more than 50 ℃, and the smaller the temperature difference, the less scabbing is, the saturated steam with 0.7MPa is preferably selected according to the specific treatment capacity of the device.

Further, the conveying equipment is a jacket centrifugal pump; the conveying equipment is preferably an open impeller type jacketed centrifugal pump due to the high viscosity of the nitrophosphate molten slurry.

In order to adjust the nutrients of the fertilizer and produce products with different purposes, a feed inlet of the melting tank is also communicated with an adjusting pipeline, monoammonium phosphate, potassium sulfate or potassium chloride with a certain proportion is added into the melting tank through the adjusting pipeline, and after being uniformly mixed, the materials are conveyed, pressurized and granulated in the melting tank; of course, the nitrophosphate fertilizer particle conveying pipe can be connected with an adjusting pipeline, so that the nitrophosphate fertilizer particle conveying pipe and the nitrophosphate fertilizer particle conveying pipe are uniformly mixed and then conveyed to a melting tank for melting.

The utility model provides an each equipment is made by stainless steel, for satisfying the fused particle material needs, guarantees heat transfer effect, establishes interior coil pipe and agitator, the peripheral hardware half-pipe, for preventing the emergence of scabbing phenomenon, sets up conveying line into the double-layered sleeve pipe structure by the heating of low pressure saturated steam to make the intraductal steam of cover and the interior material temperature difference of pipe be not more than 50 ℃; in order to prevent environmental pollution, an exhaust port on the melting tank is communicated with a tail gas dust removal system, and top exhaust gas is collected to the tail gas dust removal system; in order to adjust the nutrient structure of the product, the adjusting pipeline is additionally arranged, so that various requirements can be met on the same device.

The utility model melts the granulated nitric phosphate fertilizer materials including unqualified returned material particles, and the surface of the product obtained by re-granulation through the roller granulator is more round, high in hardness, high in strength, good in uniformity, easy to dissolve and difficult to agglomerate, thereby reducing the occurrence of agglomeration and pulverization phenomena; and the nutrients of the mixed fertilizer can be adjusted according to market demands, so that the market demands are met, and the mixed fertilizer has higher market competitiveness.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

FIG. 1 is a schematic plan view of a nitrophosphate fertilizer melt pulp roller granulation device.

In the figure: 1. a nitrophosphate granule conveying pipe; 2. a saturated steam line; 3. a vapor condensate line; 4. a melting tank; 5. a stirrer; 6. an inner coil pipe; 7. a half pipe; 8. a pneumatic regulating valve; 9. a delivery line; 10. a conveying device; 11. a roller granulator; 12. and (4) a spray head.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Examples

The nitrophosphate fertilizer slurry melting roller granulation device shown in the figure 1 comprises a melting tank 4, a conveying device 10, a roller granulator 11, a saturated steam pipeline 2 and a steam condensate pipeline 3, wherein a stirrer 5 and an inner coil 6 are arranged in the melting tank 4, a half pipe 7 is arranged on the side wall of the melting tank 4 in a surrounding manner, the saturated steam pipeline 2 is connected to the inlets of the half pipe 7 and the inner coil 6, a pneumatic regulating valve 8 for controlling the steam quantity in the half pipe 7 and the inner coil 6 is arranged on the saturated steam pipeline 2, the steam quantity in the inner coil 6 and the half pipe 7 is regulated through the pneumatic regulating valve 8, and the heating temperature of the melting tank 4 is further controlled to be maintained between 130 ℃ and 150 ℃; a feed port of the melting tank 4 is connected with a discharge port of the nitrophosphate fertilizer particle conveying pipe 1, the discharge port of the melting tank 4 is sequentially connected with a conveying device 10 and a roller granulator 11 through a conveying pipeline 9, a spray head 12 is arranged in the roller granulator 11, the spray head 12 is provided with two feed ports, the two feed ports of the spray head 12 are respectively a molten slurry inlet communicated with molten slurry and a steam inlet communicated with 0.3MPa low-pressure saturated steam, and the saturated steam is used as a power medium to drive the molten slurry to be granulated in the roller granulator 11; the conveying pipeline is a jacketed pipe and is divided into a sleeve and an inner pipe, a heat tracing medium of 0.7MPa steam flows through the sleeve, and the inner pipe flows through the conveying medium to melt molten slurry; in order to reduce the scabbing phenomenon of the conveying pipeline 9 to the maximum extent, the temperature difference between the steam in the sleeve and the material in the inner pipe is not more than 50 ℃, and the smaller the temperature difference, the more difficult the scabbing phenomenon is. In particular, the conveying device 10 is a jacketed centrifugal pump; because the viscosity of the nitrophosphate molten slurry is higher, the conveying equipment is an open impeller type jacket centrifugal pump.

Further, the spray head is a PT50 spray head.

In order to adjust the nutrients of the fertilizer and produce products with different purposes, an adjusting pipeline is connected to the nitrophosphate fertilizer particle conveying pipe 1, and the nitrophosphate fertilizer particle conveying pipe is uniformly mixed and then conveyed to a melting tank 4 for melting.

The device conveys granular nitric phosphate fertilizer into a melting tank 4, the temperature in the melting tank is controlled to be 130-150 ℃, granular materials are melted, the obtained molten slurry is pressurized by a conveying device 10 and then conveyed to a roller granulator 11 for granulation, and compound fertilizer granules are obtained.

The equipment in the utility model is made of stainless steel, in order to meet the requirement of melting particle materials and ensure the heat transfer effect, an inner coil pipe 6, a stirrer 5 and an outer half pipe 7 are arranged, and in order to prevent the scabbing phenomenon, a conveying pipeline 9 is arranged into a jacket pipe structure heated by low-pressure saturated steam; in order to prevent environmental pollution, an exhaust port on the melting tank 4 is communicated with a tail gas dust removal system, and top exhaust gas is collected to the tail gas dust removal system; in order to adjust the nutrient structure of the product, an adjusting pipeline is additionally arranged to meet various requirements on the same device.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a nitrophosphate fertilizer melt pulp cylinder prilling granulator which characterized in that: the device comprises a melting tank, conveying equipment, a roller granulator, a saturated steam pipeline and a steam condensate pipeline, wherein a stirrer and an inner coil pipe are arranged in the melting tank, a half pipe is arranged on the side wall of the melting tank in an enclosing manner, the saturated steam pipeline is connected with the inlets of the half pipe and the inner coil pipe, and a regulating valve for controlling the steam quantity of the half pipe and the inner coil pipe is arranged on the saturated steam pipeline; the feed inlet of melting jar is connected with the discharge gate of nitrophosphate fertilizer granule conveyer pipe, the discharge gate of melting jar passes through the conveying line and is connected with conveying equipment and cylinder granulator in proper order be equipped with the shower nozzle in the cylinder granulator, the shower nozzle is equipped with two feed inlets.

2. The nitrophosphate fertilizer melt-down roller granulation device as recited in claim 1, wherein: the two feed inlets of the nozzle are respectively a molten slurry inlet communicated with molten slurry and a steam inlet communicated with saturated steam.

3. The nitrophosphate fertilizer melt-down roller granulation device as recited in claim 2, wherein: the spray head is a PT50 spray head.

4. The nitrophosphate fertilizer melt-down roller granulation device as recited in claim 1, wherein: the conveying pipeline is a jacketed pipe.

5. The nitrophosphate fertilizer melt-down roller granulation device as recited in claim 4, wherein: the conveying pipeline consists of a sleeve and an inner pipe.

6. The nitrophosphate fertilizer melt-down roller granulation device as recited in claim 1, wherein: the conveying equipment is a jacket centrifugal pump.

7. The nitrophosphate fertilizer melt-down roller granulation device as recited in claim 6, wherein: the conveying equipment is an open impeller type jacket centrifugal pump.

8. The nitrophosphate fertilizer melt-down roller granulation device as recited in claim 1, wherein: the feed inlet of the melting tank is also communicated with an adjusting pipeline.

9. The nitrophosphate fertilizer melt-down roller granulation device as recited in claim 1, wherein: and the nitrophosphate fertilizer particle conveying pipe is connected with an adjusting pipeline.

10. The nitrophosphate fertilizer melt-down roller granulation device as recited in claim 1, wherein: and an exhaust port on the melting tank is communicated with a tail gas dedusting system.