Anhydrous spherical calcified calcium, calcified calcium, spherical calcium

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Content of drying equipment
Changzhou Keda drying equipment Co., Ltd
Author: Gu Zhijun | original source:Changzhou dryer|Time: April 11, 2015

Anhydrous sphereFenghuo 38041;Fenghuo 38041;Anhydrous calciumSpherical corrosion 38041;——Changzhou Keda drying equipment Co., Ltdsinochemtest.comwww.kddry.netwww.kddry.cn

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Our company cherishes the opportunity to participate in the project construction of your company,The formulation of the scheme is based on the accumulation of our company's experience in acid calcium production, dehydration, granulation and drying over the years. The raw material of the project is chemical calcium solution (content of 45%); in the whole production
In the process flow, energy consumption is the main index of production cost
After concentration, it is atomized by spray gun and directly enters into granulation host, and contacts with high temperature heat exchange air directly in fluidized floor. After liquid atomization, dry contact area increases by 1000This process is the best treatment and solution selected on site in this scheme. Process formulation and machine layout, machine selection difference and other urban influence drying effect, and lead to product quality and operation stability. Therefore, there are special requirements for the selection and configuration of drying equipment.The system fully considers the characteristics of poor fluidity of dry and wet materials, feeding mode of fluidized bed, structure of air distribution plate, classification of hot air chamber, adjustment of air volume distribution, operation observation, etc., which are specially designed to facilitate on-site operation and ensure the stable, normal and continuous operation of drying system.Under the action of two-stage atomization layer of the concentration tower designed by the system, the water will flow out to the storage tank of mother liquor pool or directly enter the fluidized floor granulator after the concentration reaches the standard. Finally, the clean air will be discharged into the high gas.
Anhydrous spherical calcified calcium, calcified calcium, spherical calcium
Note: the industry benchmark is that more than 94% is anhydrous calcium electrified, and the operation parameters of the process can be adjusted to increase the maximum 98%
The standard of spheroidized calcium is quoted from "Handbook of inorganic salt industry"
Fluidized bed spray coating granulation
1. Technical requirements:
45% of the chemical calcium solution is sprayed into the fluidized bed for coating and granulation with the crystal seeds. The output is designed to be 4.2 tons of calcium particles with solid content ≥ 95% per low time. Product status: spherical, diameter 2 ~ 4 mm, product material temperature: 60 ℃.
2. Process gas process
The natural air is heated in the high temperature heat exchanger. The blower blows the hot air into the spray granulation fluidized bed, which is mixed with the gasification solution sprayed by the feed liquid pump and the crystal seeds in the fluidized bed for heat and mass transfer. The coating and granulation process is completed and the gasification and gasification bubble particles are dried to 95%. Part of the powder is carried by the tail gas of the over drying process and enters the tail gas two-stage absorption tower for absorption by the washing machineIt will enter into high gas after meeting the requirements of environmental protection;
Granulation drying expert
(1) Process design
1、 Process design description
1.1 process plan
1.2 process
The natural air is heated in the high temperature heat exchanger, and the blower blows the hot air into the spray granulation fluidized bed, which is mixed with the gasification solution sprayed by the feed liquid pump and the seeds in the fluidized floor for heat and mass transfer. The coating and granulation process is completed, and the gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasification gasificationHigh gas is discharged after seeking.
2、 Design scope
The design work of this mechanized calcium granulation system is a complete system process design
Granulation drying expert
The calcium carbide granulation system of our plant includes: 1
Heat source system, particle system, cooling system, electric control system; excluding packaging machine.
3、 Thermal calculation
The design parameters are as follows:
proportion
Baume degree (° b)
At 25 ℃
one point zero eight
one point four five
ten point eight
forty-five point one
Salt content
Freezing point (℃)
The percentage of the solution is in 100 parts of water
nine point four
forty-three point five
ten point four
sixty-four point nine
-5.2
-4.5
Design parameters:
1. Material name:
2. Feed volume:
3. Yield:
4. Specific heat of material:
5. First moisture content (wet basis)
6. Final moisture (wet basis)
7. Dewatering capacity:
8. Ambient temperature:
9. Specific heat of drying medium:
10. Drying air inlet temperature:
Fenghuo 38041;
G1=0kg/h
G2=4200kg/h
Cp=0.27kcal/kg℃
W1=55%
W2=6%
M=0kg/h
t0=20℃
Cs=0.24kcal/kg℃
t1=400℃
11. Drying average exhaust temperature: T2 = 145 ℃
12. Cooling exhaust temperature:
13. Feed temperature of raw material:
14. Drying discharging temperature:
15. Cooling discharge temperature:
16. Deposition density:
17. Heat dissipation coefficient:
Material balance:
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6-
t3=145℃
θ1=50℃
θ2=150℃
θ3=150℃
ρ=0kg/m^3
f=0.15

Granulation drying expert
Known:
G2= 4200.00kg/h
W1=55.00%
W2= 6.00%
1. Dehydration capacity m = G2 (W1-W2) / (1-w1) = 4573.33kg/h
2. Treatment capacity G1 = G2 + M = 8773.33kg/h
Heat balance:
Known: G2 = 42000.00kg/h CS = 0.24kcal/kg ℃ CP = 0.27kcal/kg ℃
t0= 20.0℃
θ1= 50.0℃
(1) Drying heat balance
1. Volatile water consumption heat Q1
Q1=M(595+0.47t2-θ1)
= 4573.33(595+0.47*145.0- 50.0)
=2804139.50kcal/h=11721303.11kJ/h
2. Material heating consumption Q2
Q2=G2Cp(θ2-θ1)
= 4200.00* 0.27(150.0- 50.0)
= 113400.01kcal/h= 474012.03kJ/h
3. Effective heat Q of the system
Q =(1+f)(Q1+Q2)
=(1+0.15)(2804139.50+ 113400.01)
=3355170.50kcal/h=14024612.69kJ/h
4. Dry air consumption L1
L1=Q/(Cs(t1-t2))
=3355170.50/( 0.24(400.0-145.0))
= 54823.05kg/h
5. Ambient temperature dry air volume flow v0
V0=L1(273.15+t0)/(273.15+80)
= 54823.05*(273.15+ 20.0)/(273.15+80)
= 45509m^3/h= 42404Nm^3/h
6. Volume flow at exhaust temperature V
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7-
t1=400.0℃
θ2=150.0℃
t2=145.0℃
θ3=150.0℃
t3=145.0℃


V =(L1+M)*(273.15+t2)/(273.15+ 80)
=( 54823.05+
4573.33)*(273.15+145.0)/(273.15+80)
= 70328.74m^3/h= 45941.16Nm^3/h
7. Total heat required for drying QZ
Qz=L1*Cs(t1-t0)
= 54823.05* 0.24*(400.0- 20.0)
=4999862.00kcal/h=20899423.16kJ/h
According to the above figures, the thermodynamic calculation is carried out, and the process machine is selected according to the calculation results.
4、 Process design
Spray fluidized floor granulation process:
1. Mechanism of granulation system: spray the prepared solution into the fluidized floor granulator in the form of atomization, and the atomized droplet directly contacts the material layer (crystal nucleus layer) with extremely strong fluidization. The droplet adheres to the surface of crystal nucleus before removing water, and produces local wetting layer. At the same time, the finer material layer is adhered by the local wetting layer, and the moisture in the local wetting layer is gradually removed, and the material layer powderThe end and droplet are removed by moisture
In the fluidized floor granulation area, the crystal nucleus is continuously adhered to the atomized droplets, and the collision between the crystal nuclei and the water is gradually eliminated. Therefore, the addition of particles is step-by-step, laminated, uniform, and synchronous with the evaporation of water; therefore, this method is simple, rapid and accurateThe method of granulation provides uniformity
The high part of the granulation mechanism is the accumulative granulation of coating, and the small part is agglomeration granulation.
2. Spray granulation mechanism of fluidizing floor main engine: granulation is carried out by agglomerating coating granulation; the material liquid with certain concentration is atomized by differential atomization nozzle and becomes different liquid drops
Granulation drying expert
Some droplets adhere to and infiltrate on the surface of higher particles (coating), some droplets are coated on the surface of lower particles (coating), some droplets adhere to fine powder (agglutination), and some droplets form seeds by themselves
3. Material process
Process the material return.
4. Drying medium process: the natural air is heated by the excessive temperature heat exchanger (380-400 ℃), and flows into the fluidized bed through the blower of the system. It is used as the drying medium of the granulation drying process, and carries out sufficient heat and mass transfer with the piped feed liquid in the spray granulation drying equipment. The tail gas after granulation drying is sprayed by the washing powder concentration tower
After absorbing the waste heat and dust, the concentration tower will be emptied by the system induced draft fan.
5. Spray particle process diagram
5、 Layout plan
The overall arrangement of granule manufacturing unit is based on the principle of safe operation, convenient maintenance and installation, and convenient operation.
The granulation unit is placed in the battery limit of 40 m × 50 m (see the figure).
According to the installation foundation and function of the machine, it can be divided into heat source in the west, granulation in the middle and cold in the East
Sale of packaging
1. The heat source part of the western region:
The foundation is arranged on site, which is convenient for coal ball feeding and sufficient operation space;
2. Central granulation section:
It is close to the source of raw material liquid and easy to place liquid pipeline
3. Eastern cooling package part:
Product export North District
6、 Material balance
1. Treatment capacity of stock solution:
The design parameters are as follows:
proportion
Baume degree (° b)
At 25 ℃
one point two six
one point three two
twenty-nine point nine
thirty-five point one
Salt content
Freezing point (℃)
The percentage of the solution is in 100 parts of water
twenty-seven point five
thirty-three
11 -
thirty-seven point nine
forty-nine point three
-38.6
-27.1
1. Yield:
2. Specific heat of material:
3. First moisture content (wet basis)
4. Final moisture (wet basis)
5. Ambient temperature:
6. Specific heat of drying medium:
7. Drying air inlet temperature:
G2=4200kg/h
Cp=0.2kcal/kg℃
W1=55%
W2=5%
T0 = 20 ℃ (annual average temperature)
Cs=0.24kcal/kg℃
t1=400℃
8. Drying average exhaust temperature: T2 = 150 ℃
9. Feed temperature of raw material:
10. Drying discharging temperature:
11. Cooling discharge temperature:
θ1=30℃
θ2=150℃
θ3=60℃
Material balance of drying system (4.2t granulation production line, single line as core)
Known: G2 = 42000.00kg/h; W1 = 55.00%;
W2= 6.00%
oneDehydration of drying system m = G2 (W1-W2) / (1-w1) = 4573.33kg/h
twoTreatment capacity G1 = G2 + M = 8773.33kg/h (4.2t production line needs 45% solution at low time)
2. System consumption:
2.1 according to the calculation: 61000 Nm3 / h (heating range: 20 ℃, preheated to 60 ℃ by flue gas, and then heat transferred to 60 ℃ by air
At 400 ℃, the waste heat of the tail gas discharged from the system is absorbed by the calcium concentration machine, and the exhaust temperature of the terminal tail gas is about 80 ℃.
The main components of the tail gas are high humidity and low temperature air and water vapor, and a small amount of CaCl 2 dust (< 1%);
The chemical calcium solution absorbs the waste heat of tail gas and CaCl 2 dust of tail gas, increases the concentration for recycling, and no waste water is discharged.
2.2 flue gas volume of hot blast stove: 33600nm3 / h (under standard condition); flue gas temperature after mixing is 750 ℃, and heat exchange is finished
The flue gas temperature is 170 ℃, and the air volume for system recycling is 9803 m3 / h.
3. High heat utilization rate of the system
7、 General process consumption index of granulation system (4.2 tons in total, the overall energy consumption is as follows:
1. Bituminous coal consumption: 1272kg / h (according to calorific value, 5500 kcal / m3)
Product consumption per ton: 300kg / T (actual production will not exceed 320kg)
2. Power consumption: 400KW H / h (machine power 500kW, load 80%);

Granulation drying expert
Power consumption per ton: 95kwh / h (if the power consumption per ton under full load operation is less than 100kwh / h)
threeCooling circulating solution: 20m thrice / h
Water tank only)
5. Product recovery: ≥ 99%
6. Setting up posts
System operator: 1-3 persons / shift
Packer and Porter: 2-4 persons / shift
Total of the above:
4-6 persons / shift / set
Operating cost consumption estimation table: (average output 4.2 tons / low table)
Energy consumption table: energy consumption per low hour (output of 8 low hours per shift is 32t)
Types of energy
Coal:
Electricity:
Labor:
matters needing attention
Coal consumption per ton of product is 300kg
The power consumption per ton of product is 95 degrees
About 0.2 labor per ton of product, calculated by 6 people
① The above cost consumption is for reference only
The prices of water and electricity are different);
② The Demander shall add the packing bag, freight and other unforeseen expenses according to the local price;
③ The power consumption is not included, and the machines provided by Party A are not included.
8、 Equipment list of the whole system: detailed equipment configuration of spray granulation system (30000 tons)
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