Type of compound fertilizer equipment? What are the compound fertilizer equipment?
Compound fertilizer equipment performance compound fertilizer equipment
Compound fertilizer equipment
The compound fertilizer equipment is a device for making fertilizer by using the ammonia and ammonia spray granulation method.
Introduction
Compound fertilizer equipment: drum steam granulation to produce high-concentration compound fertilizer process, disc without steam granulation to produce high, medium and low concentration compound fertilizer process, compound fertilizer anti-caking technology, high-nitrogen compound fertilizer production technology, urea melt-spraying Pulp granulation production of organic and inorganic compound fertilizer technology and so on have filled the domestic gap.
Now, the compound fertilizer equipment granulation method has appeared in the market of compound fertilizer equipment. They are suitable for domestic market and are suitable for domestic large, medium and small enterprises.
parameter
Process
Fermentation process
The production process of organic fertilizer is mainly to mix organic solid waste with water content less than 60% with auxiliary materials (plant straw, etc.), microbial fermentation bacteria, etc., and fully ferment and sterilize through pool-type aerobic continuous fermentation. Deodorize and remove water. The moisture content of the decomposed material is generally in the range of 30-35%. After screening and magnetic separation, it can be directly used for granulation to produce spherical organic fertilizer, or further dried to produce powdery organic.
Granulation process
The process of compound fertilizer can be divided into: raw material ingredients, raw material agitation, raw material granulation, granule drying, granule cooling, particle grading, finished product coating, and final product packaging.
1. Raw material ingredients:
Raw materials such as urea, ammonium nitrate, ammonium chloride, ammonium sulfate, ammonium phosphate (monoammonium phosphate, diammonium phosphate, heavy calcium, calcium phosphate) and potassium chloride (potassium sulfate) are supplied in a certain proportion (according to market demand and soil everywhere) Test results).
2. Stirring of raw materials:
Stir the prepared raw materials to increase the uniform fertilizer content of the fertilizer granules.
3. Raw material granulation:
The uniformly stirred raw materials are fed to a granulator for granulation (either by conversion granulation or extrusion granulation).
4, granule drying:
The granules produced by the granulator are sent to a dryer to dry the moisture contained in the granules, thereby increasing the strength of the granules and facilitating storage.
5, particle cooling:
The temperature of the fertilizer granules after drying is too high, and it is easy to agglomerate. After cooling, it is convenient for bagging preservation and transportation.
6, particle classification:
The cooled particles are classified, and the unqualified particles are pulverized and regranulated, and the qualified product is sieved.
7. Finished film:
Applying a qualified product to the coating increases the brightness and roundness of the particles.
8, finished packaging:
Store the granules that have been coated, that is, the finished bag, in a ventilated place.
Characteristics
1. Applicability and wide range of raw materials: It is suitable for direct consumption of crude fiber organic waste of about 30% water content such as livestock manure, sugar mill sludge, municipal sludge, paper sludge, distiller's grains, straw, and grass charcoal after fermentation. Granulation, can produce pure organic fertilizer, organic and inorganic fertilizer, bio-organic fertilizer of spherical particles.
2, the ball formation rate and biological bacteria survival rate is high: the new process can make the ball formation rate of 90-95% or more, the low temperature and high air volume drying new technology can make the microbial bacteria survival rate of more than 90%.
3, the process is short: low operating cost The organic raw materials used in the process do not need to be pre-processed such as drying, pulverization, etc., the process is short, and the running cost is low (if the traditional granulation process such as disc or drum is used, the water after fermentation needs to be The organic raw material having a content of about 30% is dried to 13% or less, pulverized to 80 mesh or more, and the organic material is added in an amount of not more than 30%.
technology
Tubular reactor technology
The NPK production unit chose to introduce the world's leading Norwegian Hydro company "tubular reactor" patented technology, including hardware and process software packages. Compared with the traditional neutralization reaction tank + ammoniation granulation process, the patented technology has great advantages in product quality and the like. Its characteristics are:
â—Advanced granulation process
According to the nutrient requirements of compound fertilizer products, various liquid and solid raw materials measured by microcomputer batching are chemically reacted to synthesize compound fertilizer in granulator and tubular reactor, and are continuously wrapped in ammoniated granulator to obtain complete spherical shape. The particles, the proportion of various nutrients can reach the standard, and it is stable and guaranteed.
â— Product pellet nutrient equalization
Because it is chemically synthesized and granulated, the nutrient content of the granular fertilizer is the same as the label, and it can provide nitrogen, phosphorus, potassium and other nutrients to the crop at a certain ratio to ensure balanced crop growth.
â—Good physical properties of the product
The product particle size distribution is uniform, 90% is particles with particle size of 2-4mm; the particle strength is high, the fluidity is good, and it is not easy to be broken during transportation, storage and stacking. The third design institute of the Ministry of Chemical Industry has also integrated the advanced technologies of French AZF and Spanish INCRO in the engineering design to further optimize the design performance of the device.
Molten urine granulation technology
â—The device adopts the technology of melting urine granulation, which can meet the requirements of producing various high-nitrogen nutrient compound fertilizers on the one hand; on the other hand, it can further improve the granulation quality, make the nitrogen content of fertilizer granules more balanced, the surface is smooth and the gloss is high. .
New technology of spray granulation in a hydrochloric acid tubular reactor
A new technology for spray granulation of acid-tube reactor, which solves the problem of equipment crusting, poor production environment, poor adaptability to raw materials, poor product appearance and nutrient uniformity, product agglomeration, Long-term stable operation and other problems, the process makes full use of urea, steam, urine, gas ammonia, air, circulating water, electricity and other public works, which can significantly reduce fixed asset investment and operating costs.
Main features of the new process for the production of the first shot of the acid spray granulation compound fertilizer:
1. Using tubular reactor and gas ammonia ammoniation technology to improve the characteristics of granulation materials and granulation conditions, the granulation temperature is 70-80 ° C, and the granulation rate is 70-80%.
2. Using a high-efficiency drying technology to improve the drying strength, the product moisture reaches ≤1.5%.
3. The hot blast stove adopts clean fluidized bed combustion technology to improve the heating effect, and the consumption of ton of fat coal is ≤15kg.
4. The system returns materials using hot screening and hot large particle crushing technology to make full use of system heat.
5. Improve the screening efficiency and product particle uniformity, φ2.0-φ4.0mm particles ≥98%.
6. Cooling uses a unique new high-efficiency cooling technology to minimize the packaging temperature.
Second, the operating characteristics of the new process of production of acid spray granulation compound fertilizer:
1, the product does not agglomerate. The product moisture is ≤1.5%, the product packaging temperature is ≤40°C, the product particle strength is ≥25N, the product appearance is smooth and round, the particle uniformity is φ2.0-φ4.0mm granule ≥98%, and the product can be achieved by simple anti-caking coating treatment. Not frozen for half a year.
2, the product nitrogen content adjustment range is large, the nitrogen content can reach ≥30%, you can produce ternary compound fertilizer (such as 30:5:5), and can also produce unit fertilizer (such as granular nitrogen fertilizer 25:0:0) and two Yuan compound fertilizer (such as 30:0:5).
3, the product variety is convenient to switch, can produce multi-variety and multi-type compound fertilizer products, can produce urea-based type, can also produce chlorine-based type, can also produce sulfur-based and nitro-type.
4. The production system is flexible and adaptable to raw materials.
5, expand the variety of raw materials, wet ammonium chloride, wet potassium chloride, calcium, calcium magnesium phosphate fertilizer, calcium hydrogen phosphate and other low-cost raw materials can be used in large quantities.
6, the equipment is not knotted, not blocked, can achieve long-term continuous and stable operation.
7. The process flow is simple, the maintenance operation and production management are convenient, the production environment is good, and the standard discharge and clean civilized production can be achieved.
8. The most economical investment and operation. Compared with the same type, fixed asset investment is reduced by more than 30%, floor space is reduced by 50%, coal consumption is reduced by 50%, power consumption is reduced by 25%, and fertilizer cost per ton is reduced by 50-75 yuan.
Third, the practical situation
Most of the technology in this process has been successfully put into operation in many sets of urea-based compound fertilizer production equipment in China, and it has highlighted the obvious advantages. The process is very suitable for the new urea-based compound fertilizer project of urea enterprises, and is also suitable for the upgrading of non-urea enterprises and existing compound fertilizer production equipment.
DCS control technology
â— According to the production characteristics of this device, the phosphoric acid and NPK control rooms are set up, and the distributed control system (DCS) is adopted. Through the whole process dynamic picture, centralized monitoring and control of grinding, phosphoric acid, sulfuric acid/phosphoric acid tank area, NPK and other devices are carried out.
The CRT of the control room can display various process parameters and the operating state of the pump; automatic control of important process parameters, the opening and closing of the main machine pump can be carried out in the control room; using the powerful functions of DCS can be timed or timely Print a variety of production reports; can display parameter violations, production accidents or system failures in a timely manner; can store and display historical trends, and provide rich operational guidance information; easy to operate and maintain.
The main functions of the DCS operation station:
· Display of process parameters and over-limit alarms;
· Easy operation of the control loop, such as adjusting the set value;
· Real-time recording and trend recording of important parameters;
· Operation and display of operating equipment;
· Valve switching operation and position display;
· System fault self-diagnosis;
· Process flow screen display;
· Screen display of the control loop;
· Print reports at regular intervals.
The DCS control technology production equipment adopts DCS microcomputer control technology in the whole process of raw material batching, production process adjustment control, etc., which significantly reduces the deviation of nutrient ratio caused by manual operation or mechanical metering, and the production operation is unstable. The phenomenon. It ensures the stable production of the device, and the product nutrient ratio is accurate and up to standard.
Film wrapping technology
The coating film wrapping system of the device adopts the latest research result of the National Engineering Research Center of Chemical Fertilizer Catalyst - active wrapping agent, and selects high-quality wrapped powder, which can effectively prevent moisture absorption and particle bonding and agglomeration after flowing through the coating film. Good sex, easy to fertilize operation, and further improve the appearance quality, to meet the user's requirements not only to meet the internal quality standards, but also to pursue the quality requirements of the external beauty.
benefit
Social benefit analysis
How to make full use of the resources of organic waste is an important issue for China to establish a resource-saving society, promote circular economy and develop organic agriculture. China is a large country of fertilizer consumption. The production of chemical fertilizers consumes a large amount of non-renewable resources such as coal, electricity and natural gas. The development of solid organic wastes produced by this project produces spherical organic fertilizers to save non-renewable resources and protect the environment. The social benefits are huge, in line with China's industrial policy of energy conservation and emission reduction.
Ecological and environmental benefits
Increasing the application rate of organic fertilizer can effectively solve the environmental pollution caused by organic waste in industries such as livestock and poultry breeding, reduce the nitrate content of chemical fertilizer to groundwater, reduce the eutrophication of surface water bodies caused by non-point source pollution, and help to improve The safety and quality of agricultural products, pollution prevention and control, and ecological and environmental benefits are extremely significant.
This article URL: The type of compound fertilizer equipment? What are the compound fertilizer equipment?
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