CN212215420U

CN212215420U - Production system for stably controlling granulation of calcium ammonium nitrate

Info

Publication number: CN212215420U
Application number: CN201922357508.8U
Authority: CN
Inventors: 王汝申; 孙孟涛; 高亮; 曹爱霞
Original assignee: Shandong Liaocheng Luxi Nitro Compound Fertilizer Co ltd
Current assignee: Shandong Liaocheng Luxi Nitro Compound Fertilizer Co ltd
Priority date: 2019-12-23
Filing date: 2019-12-23
Publication date: 2020-12-25
Anticipated expiration: 2029-12-23

Abstract

The utility model relates to a production system of stable control calcium ammonium nitrate granulation to the shower nozzle jam problem that the inside temperature instability of calcium ammonium nitrate granulator leads to among the prior art, the utility model provides a production system of stable granulator inside temperature through set up temperature sensor in rotary drum inner wall and shower nozzle department, with temperature signal conduction to control valve, by control valve air heater's temperature, makes the inside stability of maintaining of granulator. The verification proves that when the ambient temperature in the rotary drum is maintained at 75-85 ℃ and the temperature near the spray head is maintained at 118-122 ℃, stable granulation can be effectively realized, and the productivity and the product quality are improved.

Description

Production system for stably controlling granulation of calcium ammonium nitrate

Technical Field

The utility model belongs to the technical field of calcium nitrate production, concretely relates to production system of stable control calcium ammonium nitrate granulation.

Background

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be taken as an acknowledgement or any form of suggestion that this information constitutes prior art that is already known to a person skilled in the art.

Calcium ammonium nitrate is a novel high-efficiency compound fertilizer containing nitrogen and quick-acting calcium, and is widely applied to the field of chemical fertilizers in recent years due to high fertilizer efficiency and good water solubility. It is mainly used for crops and economic crops, can be used as base fertilizer, additional fertilizer and spray fertilizer, and is easy to be directly absorbed by crops due to its main nitrate nitrogen content. The production process of calcium ammonium nitrate is generally divided into the working procedures of neutralization, filtration, evaporation, granulation, packaging and the like, wherein the granulation working procedure is a very critical working procedure and is directly converted from liquid to solid. The currently adopted granulation methods are more, the most adopted granulation methods are disc granulation and roller granulation, the disc granulation is utilized, the single production capacity is small, materials are easy to accumulate below, the cleaning is difficult, and large dust is generated on site and is not easy to control; the granulation is difficult to carry out or the granule strength is low, so that the product quality problem is caused.

Patent ZL200510012494.6 provides a technique for coating and granulating ammonium nitrate calcium crystal seeds by a rotary drum fluidized bed granulation cooling technology, and atomized raw material liquid is sprayed to the crystal seed particles, so as to coat, solidify and grow the particles. The granulation process is influenced by the factors of a nozzle, the characteristics of mixed material liquid, the spraying pressure, the granulation temperature and the like. The research result of the related research team of Qinghua university on the granulation temperature shows that the operation temperature of calcium ammonium nitrate coating granulation is favorable for stable granulation when the temperature is 75-85 ℃. In addition, the temperature of the mixed calcium ammonium nitrate feed liquid is about 122 ℃ when the mixed calcium ammonium nitrate feed liquid is liquefied through a nozzle, the sprayed feed liquid is wrapped on the surfaces of calcium ammonium nitrate particles and solidified in heated air, and then crystallization heat is taken away by cooling air brought by an air blower. However, the temperature in the rotary drum is unstable due to heat release caused by crystallization, and simultaneously, the viscosity of the raw material liquid of the calcium ammonium nitrate is high, so that the spray head is easy to block due to the processing mode, the material liquid is easy to solidify and block at the spray head, or the material liquid is solidified and becomes a 'sticky tower' below the spray head, and the material liquid falls into the rotary drum under the action of gravity to form abnormal particles, so that the production progress is delayed.

SUMMERY OF THE UTILITY MODEL

Aiming at the technical problem existing in the prior art, the utility model provides a production system for stably controlling the granulation of calcium ammonium nitrate. The production system is additionally provided with an air preheater control valve, and a temperature sensor is additionally arranged in the rotary drum, so that the temperature fluctuation in the rotary drum is reduced. The research proves that when the temperature near the spray head is stabilized at 122 ℃ and the temperature in the rotary drum is stabilized at 75-85 ℃, the blockage probability of the spray head is obviously reduced.

To the above technical effect, the utility model provides a following technical scheme:

the utility model discloses the first aspect provides a production system of stable control ammonium calcium nitrate granulation, be provided with temperature sensor in production system in shower nozzle department, be provided with the control valve in air heater department simultaneously, the control valve is used for receiving the temperature signal that temperature sensor detected and adjusts air heater.

Preferably, the production system also comprises a blower, an air preheater, a rotary drum granulator, a fluidized bed, a feed liquid pump, a spray gun and an induced draft fan.

Preferably, the production system also comprises a washing tower for adsorbing harmful gas discharged from the rotary drum granulator.

Further preferably, the air preheater adopts a medium-pressure steam regulating valve; furthermore, medium-pressure steam of 1.2-1.3 MPa is adopted.

Further preferably, the inner wall of the rotary drum granulator is uniformly distributed with shoveling plates bent in the same direction for bringing the particles at the bottom of the rotary drum granulator into the fluidized bed.

Further preferably, a temperature sensor is arranged on the inner wall of the rotary drum granulator, and the control valve receives signals of the spray head and the temperature sensor on the inner wall of the rotary drum granulator simultaneously and adjusts the air preheater.

Further preferably, the air blower and the induced draft fan are respectively provided with variable frequency, and the air volume of the fan is timely adjusted according to the environmental temperature in the rotary drum.

The utility model discloses improve to traditional rotary drum fluidized bed granulation technique, set up temperature sensor in the shower nozzle department of rotary drum granulator inner wall and spray gun to increase the control valve in air heater department, the control valve can receive rotary drum granulator inner wall and shower nozzle department temperature sensor's signal simultaneously, and the temperature is preheated in the air conditioning. Additionally, the utility model discloses a variable frequency air-blower and draught fan assist temperature control simultaneously, make the drum granulator internal temperature more stable, realize stabilizing the granulation. The utility model discloses further research confirms that near the shower nozzle temperature is 118 ~ 122 ℃, and when the temperature was 75 ~ 85 ℃ in the rotary drum granulator within range, the shower nozzle took place to block up the probability very low, can realize stable production, reduces to block up and "glue the emergence of tower" phenomenon.

In some specific embodiments, the production system operates as follows: the method comprises the following steps that air is sucked into an air preheater by a blower to be heated, then the air enters a rotary drum granulator to maintain the inside to reach a certain temperature, and redundant gas is discharged under the action of a draught fan after being adsorbed by a washing tower; seed crystal particles are continuously added from the feeding end of the rotary drum granulator, and the particles fall from an overflow port of the fluidized bed along with the shoveling plate entering the fluidized bed to form a continuous and uniform material curtain; the material liquid pump mixes the raw material slurry and sucks the mixed raw material slurry into the rotary drum granulator to be atomized and sprayed to the material curtain through the spray gun, so that the particles are wrapped by the raw material slurry, solidified and grown.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses in to the actual production process, the reason that the shower nozzle blockked up is studied, provides the production temperature who is fit for rotary drum fluidized bed granulation mode, can realize the effect of stable production through simple improvement. The drum fluidized bed granulation is used as the main production mode of calcium ammonium nitrate, and the improvement scheme provided by the utility model has wide practicability and popularization value.

Drawings

The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention.

FIG. 1 is a schematic view of a production system for stably controlling granulation of calcium ammonium nitrate as described in example 1;

the system comprises a machine frame, a.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

As the introduction of the background art, the utility model provides a production system for stably controlling the granulation of calcium ammonium nitrate aiming at the defects in the prior art.

In order to make the technical solutions of the present invention more clearly understood by those skilled in the art, the technical solutions of the present invention will be described in detail below with reference to specific examples and comparative examples.

Example 1

In this embodiment, a production system for stably controlling calcium ammonium nitrate granulation is provided, as shown in fig. 1, the production system includes a rotary drum granulator 8, a fluidized bed 11, an air preheater 5, a spray gun 10, a feed liquid pump 2, an air blower 1, and an induced draft fan 3. Wherein, the inner wall of the rotary drum granulator is provided with a temperature sensor 81, a temperature sensor 101 is arranged near the nozzle of the spray gun 10, and the air preheater 5 is provided with a control valve 51.

The inner wall of the rotary drum granulator 8 is uniformly distributed with shovelling plates 9 bent in the same direction, a fluidized bed 11 is fixed in the rotary drum granulator 8, seed crystal particles are continuously added from a feeding port of the rotary drum granulator 8, the shovelling plates 9 shovels the particles at the bottom of the rotary drum into the fluidized bed 11, and the particles fall from an overflow port to form a continuous and uniform material curtain; a plurality of spray heads are arranged on the side surface of the rotary drum which is axially vertical to the material curtain. The spray head atomizes the granulation raw material into liquid drops which are sprayed to the material curtain, the liquid drops collide and contact with the moving particles, the particles coated, solidified and enlarged on the surfaces of the particles fall to the bottom of the rotary drum, and the particles are copied into the fluidized bed again.

The temperature sensor 81 and the temperature sensor 101 transmit detected temperature signals to the control valve 51, the control valve adjusts the working power of the air preheater, the temperature in the rotary drum granulator is maintained at 75-85 ℃, meanwhile, the temperature near the spray head is maintained at 118-122 ℃, stable granulation is realized, and the productivity and the product quality are improved.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A production system for stably controlling granulation of calcium ammonium nitrate is characterized in that a temperature sensor is arranged at a spray head in the production system, and a control valve is arranged at an air preheater and used for receiving a temperature signal detected by the temperature sensor and adjusting the air preheater;

the production system also comprises an air blower, an air preheater, a rotary drum fluidized bed, a feed liquid pump, a spray gun and an induced draft fan.

2. The production system for stably controlling the granulation of calcium ammonium nitrate as claimed in claim 1, further comprising a washing tower for adsorbing the harmful gas discharged from the rotary drum.

3. The system for stably controlling the granulation of calcium ammonium nitrate as claimed in claim 2, wherein the air preheater employs a medium pressure steam regulating valve.

4. The production system for stably controlling granulation of calcium ammonium nitrate as claimed in claim 3, wherein medium pressure steam of 1.2-1.3 MPa is used.

5. The system for producing ammonium calcium nitrate granules with stable control as claimed in claim 4, wherein the medium pressure steam is 1.27 MPa.

6. The production system for stably controlling calcium ammonium nitrate granulation according to claim 2, wherein the inner wall of the rotary drum is uniformly distributed with shoveling plates bent in the same direction for bringing the particles at the bottom of the rotary drum into fluidization.

7. The production system for stably controlling calcium ammonium nitrate granulation according to claim 2, wherein the inner wall of the rotary drum is provided with a temperature sensor, and the control valve simultaneously receives signals of the spray head and the temperature sensor on the inner wall of the rotary drum and adjusts the air preheater.

8. The production system for stably controlling calcium ammonium nitrate granulation as claimed in claim 2, wherein the blower and the induced draft fan are respectively provided with variable frequency, and the air volume of the fan is timely adjusted according to the ambient temperature in the rotary drum.

9. The production system for stably controlling granulation of calcium ammonium nitrate as claimed in claim 2, wherein the temperature in the rotary drum is 75-85 ℃ and the temperature near the spray head is 118-122 ℃.