1.SHS technology
Developed and designed by Shanghai Haimao Engineering Company and Shanghai Institute of Chemical Technology, this technology has been implemented in Luxi, Shandong, Xinyi, Jiangsu, Yanshi, Henan and Chenggu, Shaanxi. The core of this process is: increasing η (CO2) of urea synthesis tower; Fully tap the potential of existing equipment; Reasonable utilization of the heat of formation of ammonium carbamate and other three technologies. After the transformation, the main expected unit consumption per ton of urea is: 595kg of liquid ammonia, 760 kg of CO2, l200kg of steam, and cooling water 130t.
2. Optimized combination technology of urea high-pressure loop.
This technology was developed, designed and implemented by China Wuhuan Chemical Engineering Company. The core of this technology is to add a second urea synthesis tower in the high pressure cycle. Stripping tower and high pressure ammonium carbamate condenser; CO2 stripping technology is adopted. This technology is currently being piloted in Huixian Chemical Fertilizer Plant in Henan Province, but it has not been started for various reasons. After the implementation of this technology, it is estimated that the unit consumption per ton of urea is 585kg of liquid ammonia, 700 kg of CO2, 0/000 kg of steam/kloc-and 0/000 t of cooling water.
3. New technologies for energy saving and production increase
This technology was jointly developed by Beijing Brilliance Design Institute and Shandong Zoucheng Nitrogen Fertilizer Plant. It is characterized by the adoption of two synthetic towers, four-stage decomposition under different pressures, unique design of ammonium carbamate condenser and stripper, and by-product steam of 0.8MPa. The unit consumption per ton of urea in this process is: 590kg of liquid ammonia, 760 kg of CO2, 900kg of steam and cooling water 130t. As the process has just been implemented, it needs to be further improved and explored.
At present, the development of new technologies for urea production in China mainly includes:
1. Deep hydrolysis unit
With the social concern for environmental protection, the problem of deep hydrolysis of small urea plant has been put on the agenda gradually. At present, some domestic design units have proposed to transform the original desorption system with high-efficiency hydrolyzer, or to adopt an optimized hydrolysis-desorption system in the new plant, so that all the discharged water from urea plant can be returned to the production plant as process water or boiler make-up water, and zero discharge can be realized. The process uses 1.3 ~ 3.9 MPa steam, and the main equipment investment is 800,000 ~ 1 10,000 yuan.
2. Granulating device
Generally speaking, the problem of urea particle size can be solved in the following ways:
Selecting a large particle granulating nozzle, so that 80% of urea particles are larger than 2mm in diameter;
Adopt fluidized bed cooling device to reduce the bag-feeding temperature, solve the problem of easy caking after over-feeding, and separate particles from dust;
The technology of large-particle urea in double-drum fluidized bed developed by Beijing Dalike Company is adopted, and the diameter of urea particles can reach 4 ~ 6 mm, which has been adopted by two domestic companies.
The original granulation system does not move, the increased urea is taken out before granulation, and the urea is melted to produce NPK compound fertilizer. At present, Shanghai Institute of Chemical Technology is implementing this technology in several small urea plants.
There are many ways to produce urea, but ammonia method and carbon dioxide synthesis method are widely used at home and abroad. There is no difference in the synthetic methods of ammonia. In China, natural gas and coal are mainly used as raw materials to produce carbon dioxide. Judging from the production process of urea, no matter how pure carbon dioxide is, it will affect the output rate of urea.
In order to test the spraying effect of urea produced from different raw materials on crop leaves, this year we bought "Fengxi" brand urea produced from coal and "Tianchi" brand urea produced from natural gas from the market, and sprayed wheat and apple trees with different concentrations of urea solutions from mid-April to late May. The test site was located in Wang Fan Village, Wang Fan Township, Yuncheng City, and there were 8 test sites, including 4 wheat and 4 apples. The spraying concentrations were 1.0%, 1.5% and 2.0% respectively, and were sprayed at the jointing stage of wheat and the young fruit stage of apple. After spraying, the plant height, leaf color change and leaf burning rate of wheat, leaf color change and leaf burning rate of apple were investigated four times. The results showed that when foliar spraying 1.0% urea solution, the two brands of urea had little effect on the plant height of wheat, and the leaves of wheat and apple were basically not burned. When foliar spraying 1.5% and 2.0% urea solution, the average burn rate of wheat leaves in paddy field was 13.5% and 28.3% respectively, and that of apple leaves in Pingchuan field was 7.7% and 27.0% respectively. There is no significant difference between the two brands of urea at the same spraying concentration. This shows two things: 1. Under the experimental conditions, the suitable concentration of urea sprayed on wheat and apple trees is 1.0%, and the burn degree of the two brands of urea on crop leaves is basically the same at the same spraying concentration; Secondly, it shows that different methods of producing carbon dioxide for urea synthesis do not affect the quality of urea.
Production method of solid compound amino acid fertilizer
The technology relates to a production method of solid compound amino acid fertilizer, which is made of soybean meal and rapeseed meal as raw materials through the processes of crushing, sieving, hydrolysis, stirring, pH adjustment, discharging, drying, crushing, sieving, granulating and packaging. Compared with the prior art, the technology has the advantages of simple production, less equipment investment, short production cycle, high nutritional content of products and remarkable yield-increasing effect. No.30503 145
Long-distance conveying method and system for spraying urine for producing urea-based compound fertilizer
The invention discloses a long-distance urine conveying method and system for producing a urea-based compound fertilizer. The system consists of a urine insulation conveying pipeline system and a urine concentration control system, wherein the urine concentration control system consists of an electric regulating valve, a flow sensor, a regulator and a diluent injection pump; The urine heat preservation conveying pipeline system is of a reverse jacket heat preservation structure; Under the control of the urine insulation pipeline system and the urine concentration control system, the urine concentration is 92%-99.7% and the temperature is 125. No.30503 146
Fluidized granulation process of heterogeneous urea-based compound fertilizer
This technology is a fluidized granulation process of heterogeneous urea-based compound fertilizer. The atomized and melted urea solution in the granulator coats the granular seed crystals in the fluidized bed and granulates to produce granular compound fertilizer with phosphorus, potassium fertilizer or other substances as the core and urea as the shell. The concentration of urea solution is ≥95%, and the concentration of total nutrients (n+P2O5+K2O) of compound fertilizer is 30-57%. The seed crystal is at least one of phosphorus source or potassium source fertilizer. Adding one or more trace elements, herbicides, water-retaining agents or pesticides into urea solution. The fluidized bed can be a spouted fluidized bed or a vibrating fluidized bed. Short process flow, good product quality and high production efficiency. No.30503 147
Strong urea and its preparation method
The technology relates to a urea fertilizer. Characterized in that calcium cyanamide is added into common urea. In the process of urea production, calcium cyanamide is added into concentrated urine or molten urea according to a certain proportion, and the product is prepared after being fully and evenly mixed. The strong urea of this technology has the advantages of long fertilizer effective period and high utilization rate of urea nitrogen fertilizer. In addition, the low cost in calcium cyanamide makes this product more widely promoted. No.30503 148
Medical stone coated urea and preparation method thereof
A medical stone coated urea is mainly composed of urea, medical stone, bone glue and starch. Its advantages are that coated medical stone can reduce the loss and volatilization of urea, slow release, prolong the release period, reduce nitrate and play a certain role in environmental pollution. Coated urea fertilizer does not harden soil, but can promote crop growth, resist lodging, strengthen roots and promote early maturity. No.30503 149
The United States invented an improved polymer-sulfur-polymer coated fertilizer.
The technology discloses a fertilizer, such as urea coated with a polymer, followed by a sulfur layer, and then coated with a polymer layer. Preferably, the polymer coating is formed by direct in-situ polymerization of polymer components on fertilizer and sulfur coating. The composition can provide positive controlled release characteristics, is wear-resistant and impact-resistant, and is more economical to produce than polymer-coated fertilizers. No.30503 150
Method for preventing urea from caking
A method for preventing urea from caking is characterized in that formaldehyde is added into urine before urea granulation, so that urea and formaldehyde fully react to generate urea-formaldehyde solution (UFD solution) as urea granulation additive to produce granular urea products. The residence time of urea and formaldehyde is 1 ~ 10 hour, the pH value of urea-formaldehyde solution is controlled at 6 ~ 8, and the molar ratio of formaldehyde to urea is 4 ~ 6. No.30503 15 1
Adjustable and efficient organic-inorganic compound fertilizer
An adjustable and efficient organic-inorganic compound fertilizer and its preparation process. The raw material composition of high-efficiency organic-inorganic compound fertilizer can be adjusted, which has the advantages of improving soil and improving the utilization rate of chemical fertilizer. Compared with general chemical fertilizer, its nitrogen utilization rate can be increased by 8- 15 percentage points, phosphorus utilization rate can be increased by 5- 10 percentage points, and potassium utilization rate can be increased by 3-5 percentage points. So as to slowly release nitrogen such as urea, prolong the fertilizer efficiency and improve the fertilizer efficiency; The compound fertilizer is easily soluble in water, can be applied with irrigation water, and can also be used as a base fertilizer at one time, which realizes no topdressing and is convenient to use. No.30503 152
Urea acid crystal fertilizer and preparation method thereof
The technology relates to an agricultural urea acid crystalline fertilizer and a preparation method thereof. X-ray diffraction pattern of its crystalline powder: sulfuric acid solution and malic acid are mixed and stirred evenly, then heated to 70-65438 000℃, and then cooled to the crystalline state. This product has the advantages of good fertilizer efficiency and low dosage, and can improve the physical and chemical biological properties of soil, especially suitable for tobacco field application. No.30503 153
Fast-acting nutritional supplement for rice wilt resistance made in Japan.
Provide a nutritional supplement for preventing rice plant such as lawn grass from dying or taking effect quickly and a use method thereof. that preparation is not a chemical fertilize, and has no influence on the environment, people and livestock. This nutritional supplement for preventing death or quick acting is characterized by containing one effective component proline or two effective components proline and inosine. No.30503 154
Multifunctional nitrogen fertilizer long-acting agent
The technology relates to additives, in particular to a multifunctional nitrogen fertilizer long-acting agent. Its preparation method is made by mechanical mixing, mixed with nitrogen fertilizer or added to compound fertilizer for use. It has many functions, such as good inhibition effect, low cost, easy popularization, cleaning soil and preventing the growth of pests and weeds. No.30503 155
Granular material cooling device
The utility model discloses a granular material cooling device, which comprises a shell, a feed inlet and a discharge outlet, and is characterized in that a bulk material cone is arranged at the lower part of the feed inlet, and holes are spirally distributed on the cone; The bottom of the cooling device is provided with a flow control mechanism consisting of a plurality of flat tubes, and an adjusting grid consisting of a plurality of grooved plates with special sections is arranged above the cooling device; Cold air enters the material layer above the regulating grid from below the flat tube of the cooling device through the holes in the flat tube and the trough plate, and is sucked out by the exhaust fan. The device is especially suitable for cooling urea granules, with small floor space, low energy consumption and low crushing rate. No.30503 156
Long-distance conveying pipeline device for spraying urine for producing urea-based compound fertilizer
The utility model discloses a long-distance conveying pipeline device for spraying urine for producing urea-based compound fertilizer, which consists of a urine heat preservation conveying pipeline and a urine concentration control device, wherein the urine concentration control device consists of an electric regulating valve, a flow sensor, a regulator and a diluent injection pump, the electric regulating valve and the flow sensor are connected in series at the first section of the urine heat preservation conveying pipeline, and the injection nozzle of the diluent injection pump is connected to the urine heat preservation conveying pipeline behind the flow sensor, and the regulator controls the switch degree of the electric regulating valve and the diluent injection pump motor by connecting the output signal of the flow sensor. No.30503 157
California invents controlled-release urine-based products.
A controlled-release urea-based feed additive and a controlled-release urea-based plant nutrient for ruminants are composed of granules totally or mainly composed of urea or having urea on the outer surface and a moisture-proof interpenetrating polymer network coating on the granules, wherein the coating comprises the reaction product of urea and polyisocyanate, polyisocyanate, alkyd resin with at least one double bond in each repeating unit and the reaction product of oil with at least one double bond. Within a controlled time, such as 30- 120 days, the coated plant nutrients have a basically linear release rate in the soil. The coated ruminant feed additive has a basically linear NPN release rate in rumen within a controlled time, such as 12-24 hours. No.30503 144
Rotating spray head for fertilizer granulation
A rotary spray head for fertilizer granulation comprises a spray head body, wherein the wall of the spray head body is provided with spray holes, and the spray head body is provided with a bottom plate and an upper cover; The nozzle is provided with a feed inlet; A liquid distributor body is arranged in the nozzle body; The upper part of the distributor body is provided with an induction disc; The distributor body is fixed with the upper cover through a connecting plate; The induction disk is located below the feed inlet. The utility model is mainly used for granulation equipment parts in the production of fertilizers such as urea and ammonium nitrate. The liquid material flows orderly in the nozzle body, the pressure head of each nozzle hole is stable, the distance and time of spray granulation are short, the generation of biuret is reduced, the short circuit of cooling air is avoided, and the heat exchange efficiency is improved. No.30503 158
New preparation of nitrification and urease inhibitor invented in New Delhi, India, and its preparation method
The present invention relates to a novel preparation used as nitrification and urease inhibitor, which contains effective amounts of nitrogen fertilizer, castor oil and Artemisia annua oil, and the latter amount is sufficient to increase the nitrification inhibition activity of the preparation, and also relates to a method for preparing the preparation and a method for applying the preparation to soil. No.30503 159
Preparation process of granular compound fertilizer composition invented in Delaware, USA and its products
A granular compound fertilizer composition is prepared by applying a liquid mixture of urea and formaldehyde to a dry substrate, such as a phosphorus source, a potassium source, an auxiliary nutrient source, a micronutrient source or a mixture thereof, so that the liquid mixture reacts in situ to form a methylene urea reaction product, thereby promoting the adhesion between the substrate and the granular compound, and granulating the substrate while the liquid mixture reacts to form the granular compound fertilizer composition. No.30503 160
A regulated fertilizer containing lactic acid derivatives invented in Minnesota, USA, and its manufacturing and use methods.
The technology provides a regulated fertilizer product. Regulatory fertilizer products include urea-containing fertilizers and lactic acid derivative regulators. The concentration of the regulator is preferably about 0. 1-5% by weight. The regulator is preferably lactic acid, lactide and/or polylactide. This technology provides a method of adjusting fertilizer, including mixing urea-containing fertilizer and regulator at a temperature of about 135- 145℃ ... This technology provides a method of using the adjusted fertilizer. No.30503 16 1
Method for treating fertilizer processing solution invented by Helsinki, Finland
A method for preparing solid products containing nitrogen and phosphorus, preferably solid ammonium phosphate and/or urea ammonium phosphate products, wherein a solution containing urea and phosphoric acid is heated. Then water evaporates from the solution, and urea in the solution is decomposed into ammonia and carbon dioxide. Carbon dioxide is discharged from the reactor together with water vapor; The ammonia produced neutralizes phosphoric acid. Obtaining a suspension containing ammonium phosphate and/or urea ammonium phosphate, and curing, drying, pulverizing, grinding and/or granulating. The final product itself can be used as fertilizer or as a part of mixed fertilizer. No.30503 162
Fertilizer containing ammonium thiosulfate invented in Tokyo, Japan
The purpose of this technology is to provide an environment-friendly fertilizer containing ATS. That is, 1-50w% aqueous solution of ammonium thiosulfate (hereinafter referred to as ATS) is added to the material and/or porous material with large alkali exchange capacity (hereinafter referred to as ATS retaining material), and acid or acidic material is added to the mixture to adjust the pH to 5.5-7.6. The ATS aqueous solution of 1 ~ 15w% is added to the powdered ammonium thiosulfate fertilizer and fertilizer powder containing more than one of nitrogen, phosphorus and potassium components obtained in this way or a mixture obtained by adding ATS retention substances to the fertilizer powder and mixed to form a powdered or granular ammonium thiosulfate fertilizer. No.30503 163
A stable, synergistic and sustained-release calcium cyanamide composition invented in Oregon, USA.
The technology discloses a calcium cyanamide composition and a use method thereof. These compositions and methods stabilize compositions containing calcium cyanamide active ions, and improve the efficacy of calcium cyanamide alone or in combination with nitrogen-containing substances such as urea and organic substances such as manure. These compositions and methods also help to deliver the contents of the stabilizing composition directly to the controlled site. These compositions and methods are effective for fertilization, soil improvement, metal stabilization and odor and biological inhibition. These compositions are stable, easy to calibrate, and do not clog when sprayed and delivered to the target site. No.30503 164
Method for producing nitrogenous potash fertilizer invented in The Hague, Netherlands
The technology relates to a production method of nitrogenous potash fertilizer based on urea and potassium chloride. The method includes mixing potassium chloride and urea in a blender, heating the mixture and granulating. Select 1.66-9.9% (by mass) potassium chloride to mix, and the urea will be input into the mixer in the form of frits. Granulation is carried out by granulation in a granulation tower in a gas stream. The nitrogenous potash fertilizer thus produced contains (by mass). No.30503 165
Method for manufacturing and using leafy vegetable controlled-release fertilizer
The technology is a method for making and using controlled-release fertilizer for leafy vegetables, which includes the following steps: weighing according to the formula, stirring and mixing evenly, and packaging to obtain the product; Its application method is to use it as base fertilizer, spread it on the whole layer 1 ~ 2 days before sowing or transplanting, and then level the ground; The dosage is 40 ~ 50kg/mu. The technology has the advantages of simple preparation process, low cost and low product price, and the nutrient release rate of the product is more in line with the demand law of leafy vegetables for nutrient absorption, with long fertilizer efficiency, high fertilizer nutrient utilization rate, convenient use and labor saving. No.30503 166
Potassium nitrate compound fertilizer
The technology belongs to the field of fertilizers, and relates to a novel nitrogen, phosphorus and potassium compound fertilizer and a production method thereof. Potassium nitrate compound fertilizer is a new type of fertilizer made of potassium nitrate, ammonium bicarbonate, urea and ammonium phosphate through granulation, drying and sieving, because it contains nitro nitrogen fertilizer. Widely used in different regions, different seasons and different crops, with the characteristics of increasing crop yield and improving soil structure. No.30503 167
Coated humic acid urea and preparation method thereof
The invention relates to a coated humic acid urea and a preparation method thereof, which adopts a method of coating by reacting coal humic acid with urea particles after activation, wherein the humic acid urea comprises the following components in percentage by weight: 3-5% of water, 2- 12% of ash, 3- 18% of humic acid and 70-95% of urea. The method has the advantages of simple process, mild production conditions and low cost. The coating formed by the reaction effectively inhibits the decomposition speed of urea in soil and the generation of nitrite, so that the average crop yield is increased by more than 10%, the nitrogen utilization rate is increased by 5- 10 percentage point, the cost is reduced by 5% compared with urea, and the environmental pollution caused by urea application is slowed down. No.30503 168
Selenium-enriched amino acid and its production method
The technology belongs to a substance for increasing selenium content in agricultural products, promoting crop growth and increasing crop yield and its production method. Using plant cake or other substances rich in plant protein as raw materials, it is hydrolyzed under high temperature and acidic conditions, and selenium-enriched amino acids are made by adding selenides and trace elements. When used in grain, fruit, vegetables, melons, tea and cash crops, it can promote crop growth, enhance crop stress resistance and improve product quality. Selenium content in agricultural products increased significantly, and crop yield increased by 5% ~ 30%. No.30503 169
High liquid level alarm method
The technology relates to a high liquid level alarm method, in particular to a high liquid level alarm method for granulation by a rotary granulation nozzle of a urea device. Characterized in that a thermocouple is installed at the upper part of the rotary granulation nozzle of the urea device. This technology has the characteristics of high reliability and good accuracy because it uses thermocouple to measure temperature and alarm, which solves the problem of urine crystal blockage and can reduce the loss by 50 thousand yuan every year. No.30503 170
Method for improving strength of urea granules
The technology relates to a method for improving the strength of urea granules. The technology is characterized in that the formaldehyde solution is pumped from the storage tank into the second evaporator in the urea evaporation process, water is evaporated in the second evaporator, and formaldehyde reacts with urine in the second evaporator and its subsequent processes to generate methylene diurea and its polycondensate. By adopting this technology, urea has more uniform particle size, less dust, dry and smooth particles, no sticky hands and no discoloration. No.30503 17 1
Amino acid biological fertilizer and preparation method thereof
An amino acid biofertilizer contains 5- 15wt% of potassium-containing amino acid solution, 40-60wt% of animal manure fermented products made from animal manure, brewer's grains and plant seed meal, such as rapeseed meal, tung seed meal, cottonseed meal, castor bean meal and soybean meal, and 35-45wt% of inorganic fertilizer containing trace elements. Amino acid bio-fertilizer has the advantages of high fertilizer utilization rate, fast fertilizer efficiency, improved mature soil and improved crop quality. No.30503 172
Urea granulation method invented by Lugano-Biso in Switzerland
The method of urea granulation in the granulation tower [1] includes the following steps: making a large number of molten urea droplets fall from the urea melt distribution device [4] to the urea particle collection bottom [6] of the granulation tower, and also includes the step of cooling the collection bottom [6]. No.30503 173
Production technology and special equipment of compound long-acting urea
This technology relates to the industrial production of urea, in particular to a composite long-acting urea production process and special equipment. The production proces adopts a full circulation mode, and a composite inhibitor is adde into water, urine or molten urea before that urea granulation process, wherein the addition amount of the composite inhibitor is 0.5-5% of the weight of urea after the granulation tow process, and the composite long-acting urea is prepared after uniform mixing; On the basis of urea production process, compound long-acting urea is prepared by adding liquid compound inhibitor solution with water or urine as solvent after flash tank process and before entering liquid storage tank, or adding molten urea compound inhibitor solution with molten urea as solvent after secondary evaporation separation and before entering granulation tower. It can further prolong fertilizer efficiency and improve nitrogen utilization rate.