Drying of calcium calcification solution by concentrated fog granulation，Calcium silicate granulator，Calcium calcification spray granulation，Calcification dryer---Changzhou Keda drying equipment Co., Ltdsinochemtest.com，www.kddry.cn，www.ganzaojishebei.cn，www.ganzaojishebei.net，www.ganzaojishebei.org，www.idry.cn，www.hongganjishebei.rog。
Chemical calcium liquid concentration spray granulation drying scheme
Description: Changzhou Keda drying equipment Co., Ltd. is the only manufacturer in China that can realize continuous operation of the machine for shell calcium granulation and drying system. The enterprise has designed and manufactured the machine for more than ten enterprises at home and abroad and has successfully operated. The maximum scale of calcium granulation and drying production line that has been successfully operated now can reach 50000 tons / year without water tankIn 2010, the 5t / h non water tank calcium granulation and drying production line designed and manufactured by the enterprise for a large box calcium plant in Southeast Asia in 2010 has been successfully put into operation. Please be careful when selecting the manufacturer of calcium granulation and drying equipment for the production line, and make reference for the equipment operation.
Spray fluidization floor granulation process is a garment process designed by our company specialized in calcium liquid treatment. The main personnel of the enterprise have many years of experience in calcium liquid treatment and have a lot of achievements. Compared with the old casserole cooking and multi effect evaporator process, this process has the following advantages:
L use a variety of preheaters and waste heat collectors, make full use of heat energy, temperature is not limited
L the multi-stage dust removal structure is used, and the emission meets the requirements of environmental protection
L channel structure, no maintenance required.
L low floor area and low civil engineering investment.
The thermal efficiency is the highest, which can reach more than 90%.
L total energy consumption: anhydrous calcium gasification is formed when the concentration of feed liquid is 30%; benchmark coal consumption: 300 kg / T product.
1、 A brief introduction to the properties of mechanical calcium
1.1 main properties
According to its existing form, calcium carbide is often divided into: Chemical; solution, six hydration; four hydration; four hydration; flake two hydration; powder / Bee anhydration; two hydration; two hydration; white; white; granular crystal, granular crystal, strong solubility, easily soluble in water, soluble in water, soluble in soluble in; in at at at at; at in at at at at at at; at at at at at at at at; at at at at at at at at at; at at at at at at at at; at at at at at; at at at at; at at; at; at; at; at; at; at; at; at; at; at; at; at; at; at; at; at; at; at; at; at; at; at; at; at; at; at; at; at; at; at; at; at; at; at; at; at; at in industrial products, it is called dihydrateAnhydrous calcium is a colorless cube, industrial products are white or gray white solid, which are easy to absorb moisture in the air. The content of anhydrous calcium varies with the composition, but it is anhydrous when the content is more than 93%.
1.2 special properties of drying
In industrial production, it is difficult to compare the drying process of dihydrate calcium and non hydrate calcium
In the drying process of calcium calcification, the process of molten solution is changed
Often in the case of calcium calcification in different temperatures have different solubilityIt is easy to have problems.
High dehydration temperature
Under standard pressure, the melting point of the saturated solution of calcium dihydrate is about 170 ℃. The monohydrate calcium is often obtained by cooling the Ca2 + Ca2 + Ca2 + Ca2 + Ca2 + Ca2 + dihydrate is formed when the Ca2 + dihydrate is heated to 260 ℃. Therefore, the inlet air temperature is greater than 260 ℃ in the drying process, and a certain drying time is required.
1.3 particularity of calculation
Different from the calculation of general surface water dehydration, the amount of crystal water and the heat of formation of dehydrated crystal water should be taken into account in the calculation of calcium drying dehydration and heat required.
2、 The original number is fixed and the parameters are determined
1. Raw material: the liquid-solid content of the raw material is ≥ 30%; the temperature of the raw material is normal temperature (design value 10 ℃).
2. Dry goods: output 1500kg / h; solid content ≥ 98%; dry goods temperature ≤ 60 ℃.
3. Material and product status: solid ball without hydrated bubble, adjustable particle size of 1-4mm.
4. Energy consumption: coal consumption is 300 kg / T product; power consumption is 100 kwh / T product.
5. Labor consumption: 1 fireman / shift; 1 Inspector / shift (fireman can be concurrently employed); 3 packers / shift.
6. Occupied area of system equipment: 30 × 15m2 (length × width), with standard size of 9m. (the occupied land can be adjusted according to the actual situation on site)
3、 Introduction to process
3.1 schematic diagram of chemical calcium liquid concentration and drying process
Chemical calcium feed solution
Raw liquid delivery pump of air drying blower
Hot air heat exchanger flue gas recovery evaporator flue gas induced draft fan desulfurization dust collector emptying
High temperature liquid temporary storage tank
Atomization blower atomizer washing clothes calcium liquid into
Spray fluidized floor drying granulator cyclone separator waste heat recovery device wet dust collector system induced draft fan
Granule shaping machine sealing wholesaler washing clothes calcium liquid discharge
Fine powder recovery of cooler
3.2 process description
Material process: the raw material liquid of organic calcium enters into the filter through the delivery pump for preheating and filtering of the vaporized calcium liquid, and then enters the flue gas recovery evaporator for evaporation. After evaporation to a certain concentration, it enters the high temperature liquid temporary storage tank, and then it is transported by the atomization pump into the spray fluidized floor drying granulator to complete the granulation drying. The high part is cooled by the cooler after passing through the particle shaping machineIn the process, the flow rate of gasification solution is fully adjusted.
Drying hot air process: the cold air is heated by the hot air heat exchanger of the coal-fired hot blast stove to become hot air. As the drying medium of the granulation drying process, the hot air can fully exchange heat with the large concentration solution pumped into the atomization pump in the spray fluidized floor granulation drying equipment, and the hot air after granulation drying is dispersed by the cyclone disperser and then enters into the waste heat recoveryAfter the full heat recovery is completed in the filter, the wet dust remover is used for sufficient dust removal, and then the system induced draft fan is used for exhaust.
Flue gas process: under the action of flue gas induced draft fan, the high temperature flue gas formed by bituminous coal flue gas furnace is first heated by hot air heat exchanger to make it into hot air. The flue gas after heat exchange enters the flue gas recovery evaporator, where the heat is fully utilized. Finally, the temperature of the flue gas flowing out is about 60 ~ 80 ℃, which fully improves the thermal efficiency. Then, the function of the flue gas induced draft fan decreasesIt is fed into the desulfurization dust collector and discharged after passing through the desulfurization and dust removal.
The special design of the system fully considers the regional climate characteristics
Using special electrical control system to ensure stable and continuous operation of granulation process
L the overall thermal efficiency of the system is high, and all the possible heat in the system is used with reasonable heat recovery process. This process can save 30% of energy consumption compared with its home.
L by setting up a solution preheater system to evaporate and concentrate the solution and recycle the steam discharged from the system, a heater can be avoided and energy can be saved greatly.
L the flue gas recovery evaporator is specially designed by our company according to the operation experience of several projects. It uses a special channel structure and does not need to be shut down for maintenance.
The waste heat recovery device is specially designed and developed by our company, which has the characteristics of waste heat recovery and water evaporation,
The system uses cyclone separator and wet dust collector two-stage dust removal equipment to ensure the dust removal effect and ensure the outflow gas to meet the environmental protection requirements while recycling materials.
L the machine is quite simple, the main engine does not need maintenance, and other related auxiliary machines are conventional and mature transport machinery.
Using this process, one machine can produce 77% granular casing and no water mechanization according to the demand.
By changing the atomizer, the machine can realize the production of conventional spray drying method, and produce powder gasification according to the demand.
By adding cooling machine, the machine can not produce flake 74% casing, 77% casing and anhydrous calcium.
L the equipment occupies a small area and has less investment.
4、 Brief introduction to the main machine of mechanized calcium concentration and drying granules
4.1 flue gas recovery evaporator
L the use of segmented special channel structure to ensure complete heat utilization and high heat utilization rate.
L fully consider the corrosion and crystallization characteristics of calcified calcium solution, and use special structure to ensure unblocked.
The contact heat transfer fully meets the requirements of evaporation and concentration.
L after the flow is set, the system is automatically balanced, no manual operation is required, and the operation is simple
L special carbon steel fluid pipe shall be used for the material contacting with material and liquid
It is quite simple and does not need to be shut down for maintenance.
4.2 fluidized floor spray particle / powder drying equipment
Mechanism of fluidized bed spray granulation: granulation is carried out by agglomerating coating granulation. A certain concentration of liquid is atomized by a differential atomizing nozzle to form droplets with different heights. Some droplets adhere to and infiltrate the surface of higher particles (coating), some droplets cover the surface of low particles (coating), some droplets adhere to fine powder (agglutination), and some droplets adhere to fine particles (agglomeration)The droplets are self seeded.
The principle of fluidized bed spray pulverizing: by changing the operating parameters and adjusting the atomizing particle height of the nozzle, the atomized droplets can be dried and formed into fine calcium powder quickly and directly. Under the entrainment of wind, it will be collected directly in the cyclone separator and then cooled into products.
Different flow rates are used in different stages to ensure the drying / cooling process.
L the external removable nozzle can be used to maintain the nozzle without shutdown.
L use high caliber nozzle to ensure smooth atomization and continuous operation.
L the mobile floor drying equipment is maintenance free equipment. Compared with other machines, especially vibration equipment with high strength, the mobile floor drying equipment does not need maintenance, and has stable operation and low operation cost.
In the granulation drying process, the drying quality of the material is stable and uniform, and the operation stability is extremely high.
The part made of contact material is 304 stainless steel. It can also be Q235A. The inner surface is made of high strength anti-corrosion material.
4.3 introduction of high temperature coal-fired hot blast stove
4.3.1 gas furnace (the combination of this machine and hot air heater is bituminous coal hot blast stove)
1. Coal saving in combustion is 20% less than that in fixed grate combustion mode. The mechanical converter grate is used and the grate transformed by special design can meet the requirements of full combustion.
L stable combustion. Through effective furnace temperature display and combustion control, the instability of operation can be greatly reduced, and overheating operation can avoid burning out the heat exchanger, which is conducive to system operation;
L the concentration of dust discharged from flue gas is small. Through effective combustion and special dust control, the dust content of flue gas discharged can be ensured to be no more than 150 mg / standard, which can meet the requirements of flue gas purity of follow-up system.
The grate speed can be adjusted according to the combustion condition by using stepless transmission.
Labor intensity is small.
4.3.2 hot air heater
The heater is designed with full consideration of the characteristics of the area
The design of the integral heat exchanger makes full use of the heat radiation in front of the smoke side heater and provides the heat exchange efficiency. The heat exchange efficiency of the hot blast stove can reach more than 90%.
The high temperature heat exchange technology of "cut-off jet pipe" and "spoiler" is collected to ensure long service life. The service life of this hot blast stove can reach more than ten years under normal operation condition.
The use of special shunt structure can effectively avoid the problem of uneven flow in the return heat exchanger, resulting in local over burning, and ensure the temperature consistency of the heat exchanger.
In terms of air, reasonable wind speed can effectively reduce the power consumption of the blower, and the overall resistance is low. Compared with the resistance of 120-200 mm water column near the manufacturer, the hot air resistance of heat exchanger in our company is only 50 mm water column.
L. there is no dust on the heat exchange part to ensure the stability of heat transfer performance, completely avoid the problem of heat transfer efficiency decline caused by ash deposition in ordinary heat exchanger, and ensure the operation stability.
L use multi-stage heat exchange, high temperature stainless steel for large temperature section and special heat-resistant steel for boiler in small temperature section.
The temperature of hot air is automatically controlled, and the deviation is less than ± 5 ℃.
4.4 particle shaping machine
As the core machine, this machine is the unique technology of our enterprise.
The qualified material particles will be released by special separation method, and the unqualified materials will not enter into the product.
L the special design structure will be fluidized floor drying granulation of granular materials for particle shaping treatment, and directly return the unqualified materials as crystal seeds.
L the particle size can be adjusted according to the demand without maintenance.
4.5 wet dust collector
The dust removal efficiency is as high as 99%. There is no special requirement for the dust content, which can be as high as 100g / m3 or even more. This is a special dust collector developed and manufactured by our company for the dust removal of easily hygroscopic substances. In addition, the principle of suspended foam fluidization is applied in this dust removal process, and the virtual floating foam foam is fully used to collect fine and low dust, so the dust removal process is strengthened and the dust removal effect is excellent.
L single machine processing capacity is high, can undertake high temperature gas dust removal, gas-liquid distribution is uniform, will not be blocked by solid and viscous substances
L spray liquid consumption is small, can be recycled, can be used saturated liquid, suspension, multi-layer composite structure, no special requirements for the liquid inlet structure.
L the resistance of the machine is low, and the maximum resistance of the machine under full load operation reaches 800pa, which is about half of that of the dust remover, with high power saving and energy-saving consumption.
L internal use of special structure can ensure high drop and small residual liquid volume
L material can be designed as stainless steel, internal anti-corrosion steel, pp. 304 stainless steel is selected here
4.6 system blower
The fan is suitable for working medium and working full pressure. Its working pressure range can meet the material surface from high gas to fluidized floor, which is one of the preconditions to ensure the stable operation of fluidized floor drying equipment.
The air volume of fan can meet the fluidization of drying materials and carry enough heat for drying, which is also one of the preconditions to ensure the stable operation of fluidized floor drying equipment and meet the heat demand of the system.
L system blower housing material is carbon steel, in line with the standard.
4.7 cyclone separator
L the specially designed cyclone disperser can ensure that it still has a great dispersion efficiency when dealing with high air volume. Because of the characteristics of the basic calcium material, the special separation type dust collector is selected to ensure the dust removal efficiency.
L the lower part of the cyclone separator can be added with a sealed wholesale feeder.
L made of stainless steel.
4.8 system induced draft fan
L the fan is suitable for the working medium and working full pressure. Its working pressure range can meet the requirements from the material surface in the fluidized floor to the flow outlet of the wet dust collector, which is one of the preconditions to ensure the stable operation of the fluidized floor drying equipment.
The air volume of the fan can meet the fluidization of the materials to be dried and carry all the drying exhaust air, which is also one of the preconditions to ensure the stable operation of the fluidized floor drying equipment, and meet the heat demand of the system.
L. the system induced draft fan casing material is; steel, impeller material is 304 stainless steel, in line with the standard.
4.9 waste heat collector
L use special structure and special circuit to ensure that the heat discharged from the drying waste gas can be effectively recovered
The special structure ensures that the dry exhaust resistance will not increase greatly
L channel structure does not need to stop for maintenance
L set up a reasonable observation port to ensure that the continuous operation of the system will not be affected
L the equipment materials are determined as carbon steel and stainless steel according to the requirements.
4.10 sealing wholesale machine
L special design of sealing structure to ensure zero air leakage, to avoid the problem of dust removal efficiency reduction.
L specially designed blade structure ensures no jam.
L This machine is the original structure of our enterprise, specially designed for the parts requiring pressure sealing.
L the material is designed as stainless steel or steel according to the requirements.
4.11 indirect cooler
This machine is specially designed for the cooling process of moisture absorption materials, which does not contact with air and prevents moisture absorption. It has been proved that other large effects are achieved in the application of gasification.
The cooler is of indirect contact structure, which can recover heat by using chemical calcium liquid, and can also be cooled by circulating water
L according to the design requirements, part of the equipment material is steel
4.12 flue gas dust collector
L special structure to ensure the efficiency of flue gas dust removal, ensure that the blackness meet the ringer Mann blackness level I, discharge matching class II area requirements
L according to customer demand, the desulfurization requirements can be met by adding desulfurizing agent machine, and the desulfurization efficiency is not less than 90%
L. the material of the equipment is designed as steel lining for anti-corrosion
4.13 smoke induced draft fan
L the fan is suitable for working medium and working full pressure. Its working pressure range can meet the requirements from the furnace hearth of coal-fired boiler to the outlet of desulfurization and dust remover, which is one of the preconditions for sufficient combustion of coal-fired boiler.
The air volume of the fan is sufficient to meet the requirements of flue gas outflow, which is also one of the preconditions to ensure the stable operation of the whole heat supply system.
L flue gas induced draft fan casing material is; steel, impeller material is temperature resistant material, in line with the standard.
4.14 electrical control
Electric control provides power and control system for granulation drying system.
L use to the electrical circuit, through the incoming switch, AC contactor, thermal relay protection device composition.
L interlock the machine according to the system operation requirements.
L according to the system operation requirements, set the fault alarm.
Remote transmission of system temperature measurement signal.
5、 Scope of supply and delivery time
L scope of supply
For all machines and systems in the list, including the design, processing, installation guidance, commissioning and technical services of the whole set of equipment.
L delivery time
The supply conditions will be available within 60 days after the joint entry into force.
6、 Recent granulation and drying performance of calcified calcium and similar materials in Zhongchang enterprise
Serial number customer name project name drying equipment name heat source equipment concentration evaporation equipment
1. 5 t / h solid spherical anhydrous gasification calcium spray granulation drying equipment for Lianyungang yellow calcium production
1.0 T / h powder anhydrous calcified calcium flash steam drying equipment burning coal hot blast stove three effect concentration
3. Three effect concentration of coal-fired hot blast stove in Lianyungang yellow calcium production plant with an annual output of 100000 tons
5.0 T / h solid spherical hydrate free calcium spray granulation drying equipment of a high calcium calcification plant in India
5.0 T / h solid spherical calcium dihydrate gasification spray granulation drying equipment of Zhejiang Ningbo Huanyang Chemical Co., Ltd
2.0 Ca / h solid spherical non hydrated calcium spray granulation drying equipment of Inner Mongolia Changxin calcium calcification plant
1.0 T / h solid spherical anhydrous calcium spray granulation drying equipment of Hunan Chenzhou Chemical Group Co., Ltd
1.0 T / h solid spherical hydrate free calcium spray granulation drying equipment of a calcified calcium plant in Taiyuan
5 500 t / a solid spherical anhydrous calcium spray granulation drying equipment of Pangang steel city company Group Co., Ltd
A calcium calcification plant in Yancheng, Jiangsu Province 8000 tons / year solid spherical non hydrated calcium spray granulation drying equipment
1.0 T / h solid spherical calcium dihydrate gasification spray granulation drying equipment in Weifang Longteng calcium plant
12 Qinghai best magnesium enterprise annual output 50000 tons solid ball anhydrous cable calcium spray granulation drying equipment coal-fired hot blast stove three effect concentration
2.0 T / h solid spherical anhydrous cable calcium spray granulation drying equipment in Shandong Yingtai hehe chemical plant
14 Qinghai Jinfeng calcium industry annual output 20000 tons solid ball anhydrous gasification calcium rotary kiln spray granulation drying equipment coal-fired hot blast stove evaporator concentration
15 Chongqing fine chemical plant 1500 tons
16 Tsinghua Institute of Chemical Technology 50kg / h magnesium dihydrate granulation spray granulation drying equipment electric heater reactor
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