CN210569691U

CN210569691U - Drying system for drying ammonium chloride

Info

Publication number: CN210569691U
Application number: CN201921650530.5U
Authority: CN
Inventors: 刘子程; 陈光强; 马传明; 杨加强; 付艳鹅
Original assignee: Yingkou Yingxin Chemical Technology Co ltd
Current assignee: Yingkou Yingxin Chemical Technology Co ltd
Priority date: 2019-09-30
Filing date: 2019-09-30
Publication date: 2020-05-19
Anticipated expiration: 2029-09-30

Abstract

The utility model provides a drying system for ammonium chloride is dry belongs to magnesium hydroxide production technical field. The drying system mainly comprises a roller drying kiln, a suction fan, a tail gas absorption tower and a material transferring pump. And a shoveling plate device, a temperature measuring device and a tail gas filtering device are arranged in the roller drying kiln. The utility model replaces the traditional disc type dryer, the double-cone rotary dryer and the like with the roller drying kiln, wet materials can be dried only by natural wind, a large amount of steam is not needed for heating, and the heating energy consumption is saved; meanwhile, the cloth bag dust removal equipment is changed into a tail gas absorption tower, the tail gas dried by the roller drying kiln is further absorbed by using a low-concentration ammonium chloride solution, the heat of the tail gas is transferred to the ammonium chloride solution while the tail gas is absorbed and purified, the heat energy required by distillation and concentration of the ammonium chloride solution is reduced, and the waste heat of the tail gas is recovered.

Description

Drying system for drying ammonium chloride

Technical Field

The utility model belongs to the technical field of magnesium hydroxide production, concretely relates to a cylinder drying kiln for ammonium chloride is retrieved to magnesium hydroxide mother liquor.

Background

The high-purity magnesium hydroxide has the characteristics of no smoke, no toxicity, no corrosiveness, good thermal stability, good buffering performance, strong adsorption force, high activity and the like, and is widely applied to the fields of wastewater treatment, flue gas desulfurization and the like. The by-product ammonium chloride is mainly used for dry batteries, storage batteries, ammonium salts, tanning, electroplating, precision casting, medicines, photography, electrodes, adhesives, yeast nutrients, dough improvers and the like. Ammonium chloride, also called brine sand, is a quick-acting nitrogen chemical fertilizer. The existing ammonium chloride dryer has the following defects: 1) a large amount of steam is needed to heat and evaporate water, and large energy consumption is generated; 2) the dried tail gas needs to be subjected to cyclone separation for dust removal, and can be discharged after reaching the standard; 3) the dried tail gas contains a large amount of heat, and is directly discharged to cause high energy consumption. Due to the above disadvantages, there is a need for improvements in drying equipment.

SUMMERY OF THE UTILITY MODEL

The defect to current ammonium chloride desicator existence, the utility model provides a drying system for ammonium chloride is dry, it can show and reduce the energy consumption, improves finished product output, is showing and reduces the energy consumption, and the complete sets of equipment need not to provide the heat source again, simple structure, and the fault rate is low, energy-concerving and environment-protective.

The technical scheme of the utility model:

a drying system for drying ammonium chloride comprises a roller drying kiln 1, a suction fan 3, a tail gas absorption tower 7 and a material transfer pump 10;

the roller drying kiln 1 is obliquely arranged along the axial direction and rotates under the action of a motor and a speed reducer; one end of the roller drying kiln 1, which is higher than the horizontal plane, is an end part, and the other end of the roller drying kiln is a tail part; the end part of the roller drying kiln 1 is provided with a wet material and natural air inlet 2, and the tail part is provided with a discharge hole 5, a tail gas outlet A4 and a suction fan 3; the suction fan 3 extracts natural air from the end part of the roller drying kiln 1, a tail gas outlet A4 discharges tail gas generated by drying ammonium chloride, and a discharge hole 5 discharges dried ammonium chloride; the inside of the cylinder body of the roller drying kiln 1 is uniformly distributed with shoveling plate devices for turning over wet materials; wet materials are fed into the roller drying kiln 1 through a wet material and natural air inlet 2, the wet materials are fully dispersed in the roller drying kiln 1 and fully contacted with natural air under the turning of the shoveling plate device, and moisture is taken away through the natural air to realize drying;

a temperature measuring device and a tail gas filtering device are arranged in the cylinder body of the roller drying kiln 1 and are respectively positioned at the positions close to the end part of the roller drying kiln 1 and the tail part of the roller drying kiln 1; the temperature measuring device detects the temperature of the materials in the roller drying kiln 1 in the drying process, and adjusts the frequency of the suction fan 3 according to the temperature and changes the air intake; purifying the dried tail gas by a tail gas filtering device;

the top of the tail gas absorption tower 7 is provided with a tail gas outlet B9, the interior of the tail gas absorption tower is provided with a spraying layer 8, and the material transferring pump 10 is connected to the bottom of the tail gas absorption tower 7; the tail gas dried and filtered by the roller drying kiln 1 is discharged from a tail gas outlet A4 and enters from the bottom of a tail gas absorption tower 7, a small amount of ammonium chloride in the tail gas is absorbed by the ammonium chloride solution sprayed by the spray layer 8 after ammonia evaporation, and the waste heat of the tail gas is simultaneously transferred to the ammonium chloride solution, so that the heat required by distillation and concentration of the ammonium chloride solution is saved; the tail gas after being sprayed and absorbed is discharged from a tail gas outlet B9, and the absorbed ammonium chloride solution is conveyed to ammonium chloride distillation equipment through a material transfer pump 10 and enters the next working section.

Further, the cylinder body of the roller drying kiln 1 is made of stainless steel.

The utility model has the advantages that: the utility model replaces the traditional disc type drier, the double-cone rotary drier and the like with the roller drying kiln, the wet material can be dried only by natural wind, and a large amount of steam is not needed for heating, thereby saving the heating energy consumption; meanwhile, the cloth bag dust removal equipment is changed into a tail gas absorption tower, the dried tail gas is absorbed by using a low-concentration ammonium chloride solution, the heat of the tail gas is transferred to the ammonium chloride solution while the tail gas is absorbed and purified, the heat energy required by distillation and concentration of the ammonium chloride solution is reduced, and the waste heat of the tail gas is recovered.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

In the figure: 1. a drum drying kiln; 2. wet materials and natural wind are fed; 3. a suction fan; 4. a tail gas outlet A; 5. a discharging port; 7. a tail gas absorption tower; 8. a spray layer; 9. a tail gas outlet B; 10. a material transferring pump.

Detailed Description

The following further describes a specific embodiment of the present invention with reference to the drawings and technical solutions.

As shown in fig. 1, a drying system for drying ammonium chloride comprises a drum drying kiln 1, a suction fan 3, a tail gas absorption tower 7 and a material transfer pump 10. The roller drying kiln 1 is a long cylinder body which is obliquely arranged along the axial direction, and the rotating speed of the roller drying kiln can be adjusted within a certain range under the action of a motor and a speed reducer; the end of the roller drying kiln 1, which is higher than the horizontal plane, is an end part, and the other end is a tail part. The tip of cylinder drying kiln 1 is equipped with wet material and natural wind entry 2, and the afterbody is equipped with drain hole 5, tail gas export A4 and suction fan 3, suction fan 3 be used for extracting natural wind from the tip of cylinder drying kiln 1, tail gas export A4 discharges the tail gas after the drying. The wet material ammonium chloride from the ammonium chloride crystallization filtering equipment is fed into the drum drying kiln 1 by a feeder, the shoveling plate devices uniformly distributed in the drum are turned over, the wet material is uniformly dispersed in the drum drying kiln 1 and fully contacted with natural wind in the drum, and the moisture in the wet material is carried away by the natural wind, so that the drying purpose is achieved; and discharging the dried ammonium chloride product from a discharge port 5, and adding the required materials into the roller drying kiln 1 at regular time.

A temperature measuring device and a tail gas filtering device are arranged in the barrel of the roller drying kiln 1 and are respectively positioned at the positions close to the end part of the roller drying kiln 1 and the tail part of the roller drying kiln 1; the temperature measuring device is used for detecting the temperature of the materials in the cylinder in the drying process, and accordingly the frequency of the suction fan 3 is adjusted and the air intake is changed; the tail gas filtering device is used for purifying and drying tail gas.

The tail gas after drying and filtering contains a small amount of fine-particle ammonium chloride, a very small amount of ammonia gas, water and the like, the tail gas enters from the bottom of the tail gas absorption tower 7 and reversely contacts with the ammonium chloride solution after ammonia evaporation in the spray layer 8, and ammonium chloride dust and heat in the tail gas are transmitted to the ammonium chloride solution, so that the ammonium chloride is further recovered, and the recovery rate of ammonium chloride products and the utilization rate of waste heat in the tail gas are improved. Then the clean gas is separated from the contaminated liquid to clean the air. After the ammonium chloride in the gas flow contacts with the ammonium chloride solution, liquid drops or liquid films are diffused and attached to gas flow particles, or the particles are humidified, so that the particles are separated and removed under the action of gravity, inertia force and the like, and the absorbed clean tail gas is discharged from a tail gas outlet B9 at the top of the tail gas absorption tower 7; the absorbed ammonium chloride solution is sent to a crystallizer through a material transfer pump 10 for distillation and crystallization.

Claims

1. A drying system for drying ammonium chloride is characterized by comprising a roller drying kiln (1), a suction fan (3), a tail gas absorption tower (7) and a material transfer pump (10);

the roller drying kiln (1) is obliquely arranged along the axial direction and rotates under the action of a motor and a speed reducer; one end of the roller drying kiln (1) which is higher than the horizontal plane is an end part, and the other end is a tail part; the end part of the roller drying kiln (1) is provided with a wet material and natural air inlet (2), and the tail part is provided with a discharge hole (5), a tail gas outlet A (4) and a suction fan (3); the suction fan (3) extracts natural air from the end part of the roller drying kiln (1), a tail gas outlet A (4) discharges tail gas generated by drying ammonium chloride, and a discharge hole (5) discharges dried ammonium chloride; the cylinder body of the roller drying kiln (1) is internally and uniformly provided with shoveling plate devices for turning wet materials; wet materials are fed into the roller drying kiln (1) through a wet material and natural air inlet (2), the wet materials are fully dispersed in the roller drying kiln (1) and fully contacted with natural air under the turning of the shoveling plate device, and the moisture is taken away through the natural air to realize drying;

a temperature measuring device and a tail gas filtering device are arranged in the cylinder body of the roller drying kiln (1) and are respectively positioned at the positions close to the end part of the roller drying kiln (1) and the tail part of the roller drying kiln (1); the temperature measuring device detects the temperature of the materials in the roller drying kiln (1) in the drying process, adjusts the frequency of the suction fan (3) according to the temperature and changes the air intake; purifying the dried tail gas by a tail gas filtering device;

a tail gas outlet B (9) is formed in the top of the tail gas absorption tower (7), a spraying layer (8) is arranged in the tail gas absorption tower, and the material transferring pump (10) is connected to the bottom of the tail gas absorption tower (7); tail gas dried and filtered by the roller drying kiln (1) is discharged from a tail gas outlet A (4) and enters from the bottom of a tail gas absorption tower (7), a small amount of ammonium chloride in the tail gas is absorbed by an ammonium chloride solution sprayed by the spraying layer (8) after ammonia evaporation, and the waste heat of the tail gas is simultaneously transferred to the ammonium chloride solution, so that the heat required by distillation and concentration of the ammonium chloride solution is saved; the tail gas after being sprayed and absorbed is discharged from a tail gas outlet B (9), and the absorbed ammonium chloride solution is conveyed to ammonium chloride distillation equipment through a material transfer pump (10) and enters the next working section.

2. Drying system for ammonium chloride drying according to claim 1, characterized in that the material of the drum drying kiln (1) is stainless steel.