CN107500980B - Dissolving device, dissolving method and application of potassium fulvate - Google Patents
Dissolving device, dissolving method and application of potassium fulvate Download PDFInfo
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- CN107500980B CN107500980B CN201710770917.3A CN201710770917A CN107500980B CN 107500980 B CN107500980 B CN 107500980B CN 201710770917 A CN201710770917 A CN 201710770917A CN 107500980 B CN107500980 B CN 107500980B
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- C05—FERTILISERS; MANUFACTURE THEREOF
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- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
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- C—CHEMISTRY; METALLURGY
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Abstract
The invention belongs to a dissolving device, a dissolving method and application of potassium fulvate; the device comprises a potassium fulvate storage tank, a urea evaporation system and a urea evaporation granulation system, wherein a desorption waste liquid outlet of the urea evaporation system is connected with a liquid inlet of a solid-liquid ejector through a stirring tank and a first centrifugal pump, the solid inlet of the solid-liquid ejector is connected with the potassium fulvate storage tank through a star valve, an outlet of the solid-liquid ejector is connected with a circulating liquid inlet of the stirring tank through a pipeline mixer, a potassium fulvate solution outlet is arranged at the lower part of the stirring tank, the potassium fulvate solution outlet is connected with the storage tank through a first filter and a second centrifugal pump, and the storage tank is connected with the urea evaporation granulation system through a second filter and a third centrifugal pump; the method has the advantages of simple structure, reasonable process design, accelerating the dissolution speed on the premise that the potassium fulvate can be completely dissolved, reducing the consumption of desalted water and steam, reducing the evaporation burden of the urea evaporation granulation system, reducing the resource energy consumption and being suitable for industrial continuous production.
Description
Technical Field
The invention belongs to the technical field of production of potassium fulvate urea, and particularly relates to a dissolving device, a dissolving method and application of potassium fulvate.
Background
The potassium fulvate is a pure natural mineral active potassium element fertilizer, contains multiple nutritional ingredients such as trace elements, rare earth elements, plant growth regulators, virus inhibitors and the like, and ensures that the nutrients are more sufficient and the supply is more reasonable, thereby avoiding various physiological diseases of crops caused by the lack of elements, ensuring that the plant type of the crops is more vigorous, the leaf color is more dark green and the lodging resistance is stronger. The potassium fulvate can timely supplement nutrients lost in soil, so that the soil is activated, the vitality is realized, the continuous cropping diseases caused by excessive absorption of the nutrients in the soil are reduced, and the product can completely replace potassium sulfate or potassium chloride and potassium magnesium sulfate with the same content, and is natural and environment-friendly.
However, in the process of preparing the potassium fulvate urea by using the powder potassium fulvate, the potassium fulvate is firstly required to be completely dissolved in water, and the process of completely dissolving the potassium fulvate in water is very difficult, and the main reason is that the potassium fulvate powder is added into water, even if the potassium fulvate powder is slowly added, ash bags with different sizes are formed and suspended at the upper part of a liquid layer, the outside of the ash bags are partially dissolved potassium fulvate colloid, the inside of the ash bags are dry powder, and liquid components outside the ash bags are difficult to continuously permeate into the inside of the ash bags, namely, the process takes a long time by using strong stirring, so that the production efficiency is greatly reduced, the energy consumption is increased, and the product quality is seriously affected; and the filter in front of the metering pump is easily blocked by ash bags, so that the production of potassium fulvate urea is discontinuous.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a dissolving device and a dissolving method of potassium fulvate, which have the advantages of simple structure, reasonable process design, accelerating dissolving speed on the premise that the potassium fulvate can be completely dissolved, reducing desalted water and steam consumption, reducing evaporation burden of a urea evaporation granulating system, reducing resource energy consumption and being suitable for industrial continuous production, and application.
The purpose of the invention is realized in the following way: including fulvic acid potassium storage tank, urea vaporization system and urea vaporization granulation system, urea vaporization system's desorption waste liquid export links to each other with the desorption waste liquid import of stirred tank through the pipeline, one side of stirred tank lower part is equipped with the circulating fluid export, the circulating fluid export links to each other with the liquid import of solid-liquid ejector through first centrifugal pump, the solid-liquid ejector's solid import links to each other with the discharge gate of fulvic acid potassium storage tank bottom through star valve, the export of solid-liquid ejector links to each other with the circulating fluid import of stirred tank through the pipeline blender, the opposite side of stirred tank lower part is equipped with fulvic acid potassium solution export, fulvic acid potassium solution export links to each other with the import of storage tank through first filter and second centrifugal pump, the export of storage tank links to each other with urea vaporization granulation system through second filter and third centrifugal pump.
Preferably, the top of stirred tank is equipped with first agitator motor, and first agitator motor's bottom links to each other with first stirring vane through first (mixing) shaft, is equipped with the baffling board on the inner wall of stirred tank, and the surface of stirred tank is equipped with first heat transfer coil, and first heat transfer coil's one end links to each other with saturated steam pipeline, and first heat transfer coil's the other end links to each other with the comdenstion water pipeline.
Preferably, the baffle plate is of a cuboid structure.
Preferably, the number of the baffle plates is two, and the baffle plates are symmetrically arranged at the middle position of the inner wall of the stirring tank respectively.
Preferably, the top of storage tank is equipped with the second agitator motor, and the bottom of second agitator motor passes through the second (mixing) shaft and links to each other with second stirring vane, and the surface of storage tank is equipped with the second heat transfer coil, and the one end of second heat transfer coil links to each other with saturated steam pipeline, and the other end of first heat transfer coil links to each other with the comdenstion water pipeline.
Preferably, a first flowmeter and a first valve are sequentially arranged on a pipeline between the desorption waste liquid outlet of the urea evaporation system and the desorption waste liquid inlet of the stirring tank; a second valve is arranged between the circulating liquid outlet and the first centrifugal pump; a third valve is arranged between the potassium fulvate solution outlet and the first filter; a fourth valve is arranged between the outlet of the storage tank and the second filter; a fifth valve and a second flowmeter are arranged between the third centrifugal pump and the urea evaporation granulation system.
A dissolution method of a dissolution device of potassium fulvate, the dissolution method comprising the steps of:
step one: closing the second valve and the third valve, opening the first valve, starting the first stirring motor, enabling desorption waste liquid at the temperature of not lower than 65 ℃ to enter the stirring tank through a desorption waste liquid outlet of the urea evaporation system and a desorption waste liquid inlet of the stirring tank, closing the first valve after liquid feeding is finished, and opening the second valve;
step two: starting a first centrifugal pump, opening a star-shaped valve, enabling potassium fulvate in a potassium fulvate storage tank to enter a solid-liquid ejector, enabling desorption waste liquid in a stirring tank in the first step to enter the solid-liquid ejector, mixing the potassium fulvate and the desorption waste liquid, then entering a pipeline mixer for re-mixing, and then entering the stirring tank for stirring through a first stirring blade to prepare a potassium fulvate solution;
step three: repeating the second step, continuously adding the potassium fulvate into the potassium fulvate solution, gradually increasing the concentration of the solution, closing the star-shaped valve and the second valve when the solid content reaches 20% -22%, stopping the operation of the first centrifugal pump, opening the third valve, starting the second centrifugal pump, enabling the potassium fulvate solution with the solid content reaching 20% -22% to enter the storage tank through the first filter, the second centrifugal pump and the inlet of the storage tank, and continuously stirring the potassium fulvate solution in the storage tank through the second stirring blade;
step four: opening a fourth valve and a fifth valve, starting a third centrifugal pump, enabling the potassium fulvate solution continuously stirred in the third step to enter molten urea in a urea evaporation granulating system through the fourth valve, a second filter, the third centrifugal pump, the fifth valve and a second flowmeter for mixing, and then entering the granulating system for granulating;
step five: and when the fourth valve and the fifth valve are opened in the fourth step, repeating the first step to the second step, and when the second step is completed, closing the fourth valve and the fifth valve, and completing the third step and the fourth step so as to realize continuous production.
Preferably, in the fourth step, the flow of the potassium fulvate solution is measured by a second flowmeter, and the flow of the potassium fulvate solution is adjusted by a fifth valve, so that the weight ratio of the potassium fulvate solution entering the urea evaporation and granulation system to the molten urea in the urea evaporation and granulation system is as follows: 3:250.
The invention also provides an application of the dissolving device of the potassium fulvate in preparation of potassium fulvate urea.
The method abandons the traditional mode of dissolving the potassium fulvate by desalted water or steam condensate water, but innovatively adopts the analysis waste liquid in the urea evaporation system to dissolve the powder potassium fulvate, and the temperature of the analysis waste liquid can reach more than 65 ℃, so that the consumption of desalted water and steam is saved, and the evaporation burden of the urea evaporation granulation system is reduced; in addition, by adopting the combination action of the solid-liquid injector and the pipeline mixer and the action of the stirring device and the baffle plate in the stirring tank, the powder potassium fulvate is quickly and completely dissolved in the desorption waste liquid, compared with the existing dissolving technology, the dissolving time can be reduced from 2-3h to 30-40min, and the powder potassium fulvate can be completely dissolved without generating ash bags, so that the dissolving time is shortened and the resource consumption is reduced; the method has the characteristics of simple structure, reasonable process design, accelerating the dissolution rate on the premise that the potassium fulvate can be completely dissolved, reducing the consumption of desalted water and steam, reducing the evaporation burden of the urea evaporation granulation system, reducing the resource energy consumption and being suitable for industrial continuous production.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
For a clearer understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described with reference to the drawings, in which like reference numerals refer to like parts throughout the various views. For simplicity of the drawing, only the parts relevant to the invention are schematically shown in each drawing, and they do not represent the actual structure thereof as a product.
As shown in fig. 1, the invention relates to a dissolving device and a dissolving method for potassium fulvate and application, wherein the dissolving device for potassium fulvate is as follows: comprises a potassium fulvate storage tank 1, a urea evaporation system 22 and a urea evaporation granulation system 23, wherein a desorption waste liquid outlet of the urea evaporation system 22 is connected with a desorption waste liquid inlet of a stirring tank 7 through a pipeline, one side of the lower part of the stirring tank 7 is provided with a circulating liquid outlet, the circulating liquid outlet is connected with a liquid inlet of a solid-liquid injector 3 through a first centrifugal pump 5, a solid inlet of the solid-liquid injector 3 is connected with a discharge port at the bottom of the potassium fulvate storage tank 1 through a star valve 2, the outlet of the solid-liquid ejector 3 is connected with the circulating liquid inlet of the stirring tank 7 through the pipeline mixer 4, the other side of the lower part of the stirring tank 7 is provided with a potassium fulvate solution outlet, the potassium fulvate solution outlet is connected with the inlet of the storage tank 12 through the first filter 9 and the second centrifugal pump 10, and the outlet of the storage tank 12 is connected with the urea evaporation granulating system 23 through the second filter 13 and the third centrifugal pump 14. The top of stirred tank 7 is equipped with first agitator motor 6, and the bottom of first agitator motor 6 links to each other with first stirring vane 25 through first (mixing) shaft 24, is equipped with baffle 8 on the inner wall of stirred tank 7, and the surface of stirred tank 7 is equipped with first heat transfer coil 26, and the one end of first heat transfer coil 26 links to each other with saturated steam pipeline, and the other end of first heat transfer coil 26 links to each other with the comdenstion water pipeline. The baffle plate 8 is of a cuboid structure. The number of the baffle plates 8 is two, and the baffle plates are symmetrically arranged at the middle position of the inner wall of the stirring tank 7 respectively. The top of storage tank 12 is equipped with second agitator motor 11, and the bottom of second agitator motor 11 links to each other with second stirring vane 29 through second (mixing) shaft 28, and the surface of storage tank 12 is equipped with second heat transfer coil 27, and second heat transfer coil 27's one end links to each other with saturated steam pipeline, and first heat transfer coil 27's the other end links to each other with the comdenstion water pipeline. A first flowmeter 17 and a first valve 16 are sequentially arranged on a pipeline between the desorption waste liquid outlet of the urea evaporation system 22 and the desorption waste liquid inlet of the stirring tank 7; a second valve 18 is arranged between the circulating liquid outlet and the first centrifugal pump 5; a third valve 19 is arranged between the potassium fulvate solution outlet and the first filter 9; a fourth valve 20 is arranged between the outlet of the storage tank 12 and the second filter 13; a fifth valve 21 and a second flowmeter 15 are arranged between the third centrifugal pump 14 and the urea evaporation granulation system 23.
A dissolution method of a dissolution device of potassium fulvate, the dissolution method comprising the steps of:
step one: closing the second valve 18 and the third valve 19, opening the first valve 16, starting the first stirring motor 6, enabling desorption waste liquid at the temperature of not lower than 65 ℃ to enter the stirring tank 7 through a desorption waste liquid outlet of the urea evaporation system 22 and a desorption waste liquid inlet of the stirring tank 7, closing the first valve 16 after liquid feeding is finished, and opening the second valve 18;
step two: starting a first centrifugal pump 5, opening a star valve 2, enabling potassium fulvate in a potassium fulvate storage tank 1 to enter a solid-liquid ejector 3, enabling desorption waste liquid in a stirring tank 7 in the first step to enter the solid-liquid ejector 3, mixing the potassium fulvate and the desorption waste liquid, then entering a pipeline mixer 4 for re-mixing, and then entering the stirring tank 7 for stirring through a first stirring blade 25 to prepare potassium fulvate solution;
step three: repeating the second step, continuously adding the potassium fulvate into the potassium fulvate solution, gradually increasing the concentration of the solution, closing the star-shaped valve 2 and the second valve 18 when the solid content reaches 20% -22%, stopping the operation of the first centrifugal pump 5, opening the third valve 19, starting the second centrifugal pump 10, enabling the potassium fulvate solution with the solid content reaching 20% -22% to enter the storage tank 12 through the first filter 9, the second centrifugal pump 10 and the inlet of the storage tank 12, and continuously stirring the potassium fulvate solution in the storage tank 12 through the second stirring blade 29;
step four: opening a fourth valve 20 and a fifth valve 21, starting a third centrifugal pump 14, continuously stirring the potassium fulvate solution in the third step, mixing the potassium fulvate solution with molten urea in a urea evaporation and granulation system 23 through the fourth valve 20, a second filter 13, the third centrifugal pump 14, the fifth valve 21 and a second flowmeter 15, and granulating in the granulation system after mixing;
step five: and when the fourth valve 20 and the fifth valve 21 are opened in the fourth step, repeating the first step to the second step, and when the second step is completed, closing the fourth valve 20 and the fifth valve 21, and completing the third step and the fourth step to realize continuous production. In the fourth step, the flow of the potassium fulvate solution is measured by the second flowmeter 15, and the flow of the potassium fulvate solution is adjusted by the fifth valve 21, so that the weight ratio of the potassium fulvate solution entering the urea evaporation and granulation system 23 to the molten urea of the urea evaporation and granulation system 23 is as follows: 3:250.
The invention also provides an application of the dissolving device of the potassium fulvate in preparation of potassium fulvate urea.
The method eliminates the traditional mode of dissolving the potassium fulvate by desalted water or steam condensate water, but innovatively adopts the analysis waste liquid in the urea evaporation system 22 to dissolve the powder potassium fulvate, and the temperature of the analysis waste liquid can reach more than 65 ℃, so that the consumption of desalted water and steam is saved, and the evaporation burden of the urea evaporation granulation system 23 is reduced; the advantage of preparing the potassium fulvate solution by desorbing the waste liquid is that the water content of the potassium fulvate solution evaporated by the urea evaporation system 22 comes from the fact that the evaporation system does not break the balance of the desorption waste liquid of urea evaporation, the burden of a desorption waste liquid tank is not additionally increased, in addition, the temperature of the desorption waste liquid is higher, and the higher the temperature is, the faster and the more sufficient the dissolution speed of the potassium fulvate is; each ton of potassium fulvate solution can save 800kg of desalted water and 25kg of steam compared with the prior art. The desorption waste liquid is pumped out from the powder potassium fulvate of the star valve 2 through the solid-liquid injector 3 at a higher flow rate, and in the process, the potassium fulvate is uniformly contacted with the desorption waste liquid; the potassium fulvate and the desorption waste liquid are mixed and dissolved in an acceleration way through the pipeline mixer 4, the flow direction of water flow is changed under the action of the helical blades in the pipeline mixer 4, turbulence is generated, the mixing efficiency can be improved, the potassium fulvate which breaks up the aggregation is used for preventing ash from forming, the mixed potassium fulvate solution enters the stirring tank 7 to be continuously stirred and dissolved, the rotating speed of the stirrer is 100r/min, the flow direction of the solution is changed under the action of the baffle plate 8 in the stirring tank 7, the vortex is formed, and the dissolving efficiency is improved; because the solution passes through the pipeline mixer 4 instantaneously, the pipeline mixer 4 plays a role of primary mixing, the final complete dissolution process is completed in the stirring tank 7, and the powder potassium fulvate is quickly and completely dissolved in the desorption waste liquid by adopting the combined action of the solid-liquid ejector 3 and the pipeline mixer 4 and the action of the stirring device and the baffle plate 8 in the stirring tank 7, compared with the existing dissolution process, the dissolution time can be reduced from 2-3h to 30-40min, the complete dissolution can be realized, ash bags are not generated, the dissolution time is shortened, and the resource consumption is reduced; in addition, the stirring device in the storage tank 12 can prevent the liquid level from solidifying to form dry skin due to the fact that the solution is kept still, and normal use of subsequent procedures is affected; through the structure arrangement and the dissolution method, the large-scale industrial production of the potassium fulvate urea can be realized.
The invention will now be further described in connection with specific embodiments for a clearer explanation thereof. Specific examples are as follows:
example 1
The utility model provides a dissolving device of fulvic acid potassium, including fulvic acid potassium storage tank 1, urea vaporization system 22 and urea vaporization granulation system 23, urea vaporization system 22's desorption waste liquid export links to each other with the desorption waste liquid import of stirred tank 7 through the pipeline, one side of stirred tank 7 lower part is equipped with the circulation liquid export, the circulation liquid export links to each other with the liquid import of solid-liquid ejector 3 through first centrifugal pump 5, the solid import of solid-liquid ejector 3 links to each other with the discharge gate of fulvic acid potassium storage tank 1 bottom through star valve 2, the export of solid-liquid ejector 3 links to each other with the circulation liquid import of stirred tank 7 through pipeline blender 4, the opposite side of stirred tank 7 lower part is equipped with fulvic acid potassium solution export, fulvic acid potassium solution export links to each other with the import of storage tank 12 through first filter 9 and second centrifugal pump 10, the export of storage tank 12 links to each other with urea vaporization granulation system 23 through second filter 13 and third centrifugal pump 14. The top of stirred tank 7 is equipped with first agitator motor 6, and the bottom of first agitator motor 6 links to each other with first stirring vane 25 through first (mixing) shaft 24, is equipped with baffle 8 on the inner wall of stirred tank 7, and the surface of stirred tank 7 is equipped with first heat transfer coil 26, and the one end of first heat transfer coil 26 links to each other with saturated steam pipeline, and the other end of first heat transfer coil 26 links to each other with the comdenstion water pipeline. The baffle plate 8 is of a cuboid structure. The number of the baffle plates 8 is two, and the baffle plates are symmetrically arranged at the middle position of the inner wall of the stirring tank 7 respectively. The top of storage tank 12 is equipped with second agitator motor 11, and the bottom of second agitator motor 11 links to each other with second stirring vane 29 through second (mixing) shaft 28, and the surface of storage tank 12 is equipped with second heat transfer coil 27, and second heat transfer coil 27's one end links to each other with saturated steam pipeline, and first heat transfer coil 27's the other end links to each other with the comdenstion water pipeline. A first flowmeter 17 and a first valve 16 are sequentially arranged on a pipeline between the desorption waste liquid outlet of the urea evaporation system 22 and the desorption waste liquid inlet of the stirring tank 7; a second valve 18 is arranged between the circulating liquid outlet and the first centrifugal pump 5; a third valve 19 is arranged between the potassium fulvate solution outlet and the first filter 9; a fourth valve 20 is arranged between the outlet of the storage tank 12 and the second filter 13; a fifth valve 21 and a second flowmeter 15 are arranged between the third centrifugal pump 14 and the urea evaporation granulation system 23.
A dissolution method of a dissolution device of potassium fulvate, the dissolution method comprising the steps of:
step one: closing the second valve 18 and the third valve 19, opening the first valve 16, starting the first stirring motor 6, enabling desorption waste liquid at the temperature of not lower than 65 ℃ to enter the stirring tank 7 through a desorption waste liquid outlet of the urea evaporation system 22 and a desorption waste liquid inlet of the stirring tank 7, closing the first valve 16 after liquid feeding is finished, and opening the second valve 18;
step two: starting a first centrifugal pump 5, opening a star valve 2, enabling potassium fulvate in a potassium fulvate storage tank 1 to enter a solid-liquid ejector 3, enabling desorption waste liquid in a stirring tank 7 in the first step to enter the solid-liquid ejector 3, mixing the potassium fulvate and the desorption waste liquid, then entering a pipeline mixer 4 for re-mixing, and then entering the stirring tank 7 for stirring through a first stirring blade 25 to prepare potassium fulvate solution;
step three: repeating the second step, continuously adding the potassium fulvate into the potassium fulvate solution, gradually increasing the concentration of the solution, closing the star-shaped valve 2 and the second valve 18 when the solid content reaches 20%, stopping the operation of the first centrifugal pump 5, opening the third valve 19, starting the second centrifugal pump 10, and enabling the potassium fulvate solution with the solid content reaching 20% to enter the storage tank 12 through the first filter 9, the second centrifugal pump 10 and the inlet of the storage tank 12, and continuously stirring the potassium fulvate solution in the storage tank 12 through the second stirring blade 29;
step four: opening a fourth valve 20 and a fifth valve 21, starting a third centrifugal pump 14, continuously stirring the potassium fulvate solution in the third step, mixing the potassium fulvate solution with molten urea in a urea evaporation and granulation system 23 through the fourth valve 20, a second filter 13, the third centrifugal pump 14, the fifth valve 21 and a second flowmeter 15, and granulating in the granulation system after mixing;
step five: and when the fourth valve 20 and the fifth valve 21 are opened in the fourth step, repeating the first step to the second step, and when the second step is completed, closing the fourth valve 20 and the fifth valve 21, and completing the third step and the fourth step to realize continuous production. In the fourth step, the flow of the potassium fulvate solution is measured by the second flowmeter 15, and the flow of the potassium fulvate solution is adjusted by the fifth valve 21, so that the weight ratio of the potassium fulvate solution entering the urea evaporation and granulation system 23 to the molten urea of the urea evaporation and granulation system 23 is as follows: 3:250.
Example two
The utility model provides a dissolving device of fulvic acid potassium, including fulvic acid potassium storage tank 1, urea vaporization system 22 and urea vaporization granulation system 23, urea vaporization system 22's desorption waste liquid export links to each other with the desorption waste liquid import of stirred tank 7 through the pipeline, one side of stirred tank 7 lower part is equipped with the circulation liquid export, the circulation liquid export links to each other with the liquid import of solid-liquid ejector 3 through first centrifugal pump 5, the solid import of solid-liquid ejector 3 links to each other with the discharge gate of fulvic acid potassium storage tank 1 bottom through star valve 2, the export of solid-liquid ejector 3 links to each other with the circulation liquid import of stirred tank 7 through pipeline blender 4, the opposite side of stirred tank 7 lower part is equipped with fulvic acid potassium solution export, fulvic acid potassium solution export links to each other with the import of storage tank 12 through first filter 9 and second centrifugal pump 10, the export of storage tank 12 links to each other with urea vaporization granulation system 23 through second filter 13 and third centrifugal pump 14. The top of stirred tank 7 is equipped with first agitator motor 6, and the bottom of first agitator motor 6 links to each other with first stirring vane 25 through first (mixing) shaft 24, is equipped with baffle 8 on the inner wall of stirred tank 7, and the surface of stirred tank 7 is equipped with first heat transfer coil 26, and the one end of first heat transfer coil 26 links to each other with saturated steam pipeline, and the other end of first heat transfer coil 26 links to each other with the comdenstion water pipeline. The baffle plate 8 is of a cuboid structure. The number of the baffle plates 8 is two, and the baffle plates are symmetrically arranged at the middle position of the inner wall of the stirring tank 7 respectively. The top of storage tank 12 is equipped with second agitator motor 11, and the bottom of second agitator motor 11 links to each other with second stirring vane 29 through second (mixing) shaft 28, and the surface of storage tank 12 is equipped with second heat transfer coil 27, and second heat transfer coil 27's one end links to each other with saturated steam pipeline, and first heat transfer coil 27's the other end links to each other with the comdenstion water pipeline. A first flowmeter 17 and a first valve 16 are sequentially arranged on a pipeline between the desorption waste liquid outlet of the urea evaporation system 22 and the desorption waste liquid inlet of the stirring tank 7; a second valve 18 is arranged between the circulating liquid outlet and the first centrifugal pump 5; a third valve 19 is arranged between the potassium fulvate solution outlet and the first filter 9; a fourth valve 20 is arranged between the outlet of the storage tank 12 and the second filter 13; a fifth valve 21 and a second flowmeter 15 are arranged between the third centrifugal pump 14 and the urea evaporation granulation system 23.
A dissolution method of a dissolution device of potassium fulvate, the dissolution method comprising the steps of:
step one: closing the second valve 18 and the third valve 19, opening the first valve 16, starting the first stirring motor 6, enabling desorption waste liquid at the temperature of not lower than 65 ℃ to enter the stirring tank 7 through a desorption waste liquid outlet of the urea evaporation system 22 and a desorption waste liquid inlet of the stirring tank 7, closing the first valve 16 after liquid feeding is finished, and opening the second valve 18;
step two: starting a first centrifugal pump 5, opening a star valve 2, enabling potassium fulvate in a potassium fulvate storage tank 1 to enter a solid-liquid ejector 3, enabling desorption waste liquid in a stirring tank 7 in the first step to enter the solid-liquid ejector 3, mixing the potassium fulvate and the desorption waste liquid, then entering a pipeline mixer 4 for re-mixing, and then entering the stirring tank 7 for stirring through a first stirring blade 25 to prepare potassium fulvate solution;
step three: repeating the second step, continuously adding the potassium fulvate into the potassium fulvate solution, gradually increasing the concentration of the solution, closing the star-shaped valve 2 and the second valve 18 when the solid content reaches 22%, stopping the operation of the first centrifugal pump 5, opening the third valve 19, starting the second centrifugal pump 10, and continuously stirring the potassium fulvate solution in the storage tank 12 through the first filter 9, the second centrifugal pump 10 and the inlet of the storage tank 12 by the second stirring blade 29;
step four: opening a fourth valve 20 and a fifth valve 21, starting a third centrifugal pump 14, continuously stirring the potassium fulvate solution in the third step, mixing the potassium fulvate solution with molten urea in a urea evaporation and granulation system 23 through the fourth valve 20, a second filter 13, the third centrifugal pump 14, the fifth valve 21 and a second flowmeter 15, and granulating in the granulation system after mixing;
step five: and when the fourth valve 20 and the fifth valve 21 are opened in the fourth step, repeating the first step to the second step, and when the second step is completed, closing the fourth valve 20 and the fifth valve 21, and completing the third step and the fourth step to realize continuous production. In the fourth step, the flow of the potassium fulvate solution is measured by the second flowmeter 15, and the flow of the potassium fulvate solution is adjusted by the fifth valve 21, so that the weight ratio of the potassium fulvate solution entering the urea evaporation and granulation system 23 to the molten urea of the urea evaporation and granulation system 23 is as follows: 3:250.
Example III
The utility model provides a dissolving device of fulvic acid potassium, including fulvic acid potassium storage tank 1, urea vaporization system 22 and urea vaporization granulation system 23, urea vaporization system 22's desorption waste liquid export links to each other with the desorption waste liquid import of stirred tank 7 through the pipeline, one side of stirred tank 7 lower part is equipped with the circulation liquid export, the circulation liquid export links to each other with the liquid import of solid-liquid ejector 3 through first centrifugal pump 5, the solid import of solid-liquid ejector 3 links to each other with the discharge gate of fulvic acid potassium storage tank 1 bottom through star valve 2, the export of solid-liquid ejector 3 links to each other with the circulation liquid import of stirred tank 7 through pipeline blender 4, the opposite side of stirred tank 7 lower part is equipped with fulvic acid potassium solution export, fulvic acid potassium solution export links to each other with the import of storage tank 12 through first filter 9 and second centrifugal pump 10, the export of storage tank 12 links to each other with urea vaporization granulation system 23 through second filter 13 and third centrifugal pump 14. The top of stirred tank 7 is equipped with first agitator motor 6, and the bottom of first agitator motor 6 links to each other with first stirring vane 25 through first (mixing) shaft 24, is equipped with baffle 8 on the inner wall of stirred tank 7, and the surface of stirred tank 7 is equipped with first heat transfer coil 26, and the one end of first heat transfer coil 26 links to each other with saturated steam pipeline, and the other end of first heat transfer coil 26 links to each other with the comdenstion water pipeline. The baffle plate 8 is of a cuboid structure. The number of the baffle plates 8 is two, and the baffle plates are symmetrically arranged at the middle position of the inner wall of the stirring tank 7 respectively. The top of storage tank 12 is equipped with second agitator motor 11, and the bottom of second agitator motor 11 links to each other with second stirring vane 29 through second (mixing) shaft 28, and the surface of storage tank 12 is equipped with second heat transfer coil 27, and second heat transfer coil 27's one end links to each other with saturated steam pipeline, and first heat transfer coil 27's the other end links to each other with the comdenstion water pipeline. A first flowmeter 17 and a first valve 16 are sequentially arranged on a pipeline between the desorption waste liquid outlet of the urea evaporation system 22 and the desorption waste liquid inlet of the stirring tank 7; a second valve 18 is arranged between the circulating liquid outlet and the first centrifugal pump 5; a third valve 19 is arranged between the potassium fulvate solution outlet and the first filter 9; a fourth valve 20 is arranged between the outlet of the storage tank 12 and the second filter 13; a fifth valve 21 and a second flowmeter 15 are arranged between the third centrifugal pump 14 and the urea evaporation granulation system 23.
A dissolution method of a dissolution device of potassium fulvate, the dissolution method comprising the steps of:
step one: closing the second valve 18 and the third valve 19, opening the first valve 16, starting the first stirring motor 6, enabling desorption waste liquid at the temperature of not lower than 65 ℃ to enter the stirring tank 7 through a desorption waste liquid outlet of the urea evaporation system 22 and a desorption waste liquid inlet of the stirring tank 7, closing the first valve 16 after liquid feeding is finished, and opening the second valve 18;
step two: starting a first centrifugal pump 5, opening a star valve 2, enabling potassium fulvate in a potassium fulvate storage tank 1 to enter a solid-liquid ejector 3, enabling desorption waste liquid in a stirring tank 7 in the first step to enter the solid-liquid ejector 3, mixing the potassium fulvate and the desorption waste liquid, then entering a pipeline mixer 4 for re-mixing, and then entering the stirring tank 7 for stirring through a first stirring blade 25 to prepare potassium fulvate solution;
step three: repeating the second step, continuously adding the potassium fulvate into the potassium fulvate solution, gradually increasing the concentration of the solution, closing the star-shaped valve 2 and the second valve 18 when the solid content reaches 21%, stopping the operation of the first centrifugal pump 5, opening the third valve 19, starting the second centrifugal pump 10, and continuously stirring the potassium fulvate solution in the storage tank 12 through the first filter 9, the second centrifugal pump 10 and the inlet of the storage tank 12 by the second stirring blade 29;
step four: opening a fourth valve 20 and a fifth valve 21, starting a third centrifugal pump 14, continuously stirring the potassium fulvate solution in the third step, mixing the potassium fulvate solution with molten urea in a urea evaporation and granulation system 23 through the fourth valve 20, a second filter 13, the third centrifugal pump 14, the fifth valve 21 and a second flowmeter 15, and granulating in the granulation system after mixing;
step five: and when the fourth valve 20 and the fifth valve 21 are opened in the fourth step, repeating the first step to the second step, and when the second step is completed, closing the fourth valve 20 and the fifth valve 21, and completing the third step and the fourth step to realize continuous production. In the fourth step, the flow of the potassium fulvate solution is measured by the second flowmeter 15, and the flow of the potassium fulvate solution is adjusted by the fifth valve 21, so that the weight ratio of the potassium fulvate solution entering the urea evaporation and granulation system 23 to the molten urea of the urea evaporation and granulation system 23 is as follows: 3:250.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and the like are to be construed broadly and may be, for example, fixedly connected, integrally connected, or detachably connected; or the communication between the two components is also possible; may be directly connected or indirectly connected through an intermediate medium, and the specific meaning of the above terms in the present invention will be understood by those skilled in the art according to the specific circumstances. The above detailed description is merely for the specific description of the practical embodiments of the invention, and they are not intended to limit the scope of the invention, but all equivalent embodiments, modifications and adaptations which do not depart from the spirit of the invention are intended to be included in the scope of the invention.
Claims (8)
1. The utility model provides a dissolving device of fulvic acid potassium, includes fulvic acid potassium storage tank (1), urea vaporization system (22) and urea evaporation granulation system (23), its characterized in that: the desorption waste liquid outlet of the urea evaporation system (22) is connected with the desorption waste liquid inlet of the stirring tank (7) through a pipeline, one side of the lower part of the stirring tank (7) is provided with a circulating liquid outlet, the circulating liquid outlet is connected with the liquid inlet of the solid-liquid ejector (3) through a first centrifugal pump (5), the solid inlet of the solid-liquid ejector (3) is connected with the discharge port at the bottom of the potassium fulvate storage tank (1) through a star-shaped valve (2), the outlet of the solid-liquid ejector (3) is connected with the circulating liquid inlet of the stirring tank (7) through a pipeline mixer (4), the other side of the lower part of the stirring tank (7) is provided with a potassium fulvate solution outlet, the potassium fulvate solution outlet is connected with the inlet of the storage tank (12) through a first filter (9) and a second centrifugal pump (10), and the outlet of the storage tank (12) is connected with the urea evaporation granulation system (23) through a second filter (13) and a third centrifugal pump (14);
the top of stirred tank (7) is equipped with first agitator motor (6), and the bottom of first agitator motor (6) links to each other with first stirring vane (25) through first (24), is equipped with baffle (8) on the inner wall of stirred tank (7), and the surface of stirred tank (7) is equipped with first heat transfer coil (26), and the one end and the saturated steam pipeline of first heat transfer coil (26) link to each other, and the other end and the comdenstion water pipeline of first heat transfer coil (26) link to each other.
2. The potassium fulvate dissolution apparatus of claim 1, wherein: the baffle plate (8) is of a cuboid structure.
3. The potassium fulvate dissolution apparatus of claim 1 or 2, wherein: the number of the baffle plates (8) is two, and the baffle plates are symmetrically arranged at the middle position of the inner wall of the stirring tank (7).
4. The potassium fulvate dissolution apparatus of claim 1, wherein: the top of storage tank (12) is equipped with second agitator motor (11), and the bottom of second agitator motor (11) is passed through second (28) and is linked to each other with second stirring vane (29), and the surface of storage tank (12) is equipped with second heat transfer coil (27), and the one end and the saturated steam pipeline of second heat transfer coil (27) link to each other, and the other end and the comdenstion water pipeline of second heat transfer coil (27) link to each other.
5. The potassium fulvate dissolution apparatus of claim 1, wherein: a first flowmeter (17) and a first valve (16) are sequentially arranged on a pipeline between a desorption waste liquid outlet of the urea evaporation system (22) and a desorption waste liquid inlet of the stirring tank (7); a second valve (18) is arranged between the circulating liquid outlet and the first centrifugal pump (5); a third valve (19) is arranged between the potassium fulvate solution outlet and the first filter (9); a fourth valve (20) is arranged between the outlet of the storage tank (12) and the second filter (13); a fifth valve (21) and a second flowmeter (15) are arranged between the third centrifugal pump (14) and the urea evaporation granulation system (23).
6. A dissolving method of the dissolving device of the potassium fulvate according to claims 1-5, characterized in that: the dissolving method comprises the following steps:
step one: closing the second valve (18) and the third valve (19), opening the first valve (16), starting the first stirring motor (6), enabling desorption waste liquid at the temperature of not lower than 65 ℃ to enter the stirring tank (7) through a desorption waste liquid outlet of the urea evaporation system (22) and a desorption waste liquid inlet of the stirring tank (7), closing the first valve (16) after liquid feeding is finished, and opening the second valve (18);
step two: starting a first centrifugal pump (5), opening a star-shaped valve (2), enabling potassium fulvate in a potassium fulvate storage tank (1) to enter a solid-liquid ejector (3), enabling desorption waste liquid in a stirring tank (7) in the first step to enter the solid-liquid ejector (3), mixing the potassium fulvate with the desorption waste liquid, then entering a pipeline mixer (4), mixing again, entering the stirring tank (7), and stirring through a first stirring blade (25) to prepare potassium fulvate solution;
step three: repeating the second step, continuously adding the potassium fulvate into the potassium fulvate solution, gradually increasing the concentration of the solution, closing the star-shaped valve (2) and the second valve (18) when the solid content reaches 20% -22%, stopping the operation of the first centrifugal pump (5), opening the third valve (19), starting the second centrifugal pump (10), and enabling the potassium fulvate solution with the solid content reaching 20% -22% to enter the storage tank (12) through the first filter (9), the second centrifugal pump (10) and the inlet of the storage tank (12), and continuously stirring the potassium fulvate solution in the storage tank (12) through the second stirring blade (29);
step four: opening a fourth valve (20) and a fifth valve (21), starting a third centrifugal pump (14), enabling the potassium fulvate solution continuously stirred in the third step to enter molten urea in a urea evaporation granulation system (23) through the fourth valve (20), a second filter (13), the third centrifugal pump (14), the fifth valve (21) and a second flowmeter (15), mixing, and then entering the granulation system for granulation;
step five: and when the fourth valve (20) and the fifth valve (21) are opened in the fourth step, repeating the first step to the second step, and when the second step is completed, closing the fourth valve (20) and the fifth valve (21), and completing the third step and the fourth step so as to realize continuous production.
7. The dissolving method of the dissolving device of the potassium fulvate according to claim 6, wherein the dissolving method comprises the following steps: in the fourth step, the flow of the potassium fulvate solution is measured by a second flowmeter (15), and the flow of the potassium fulvate solution is regulated by a fifth valve (21), so that the weight ratio of the potassium fulvate solution entering the urea evaporation and granulation system (23) to the molten urea of the urea evaporation and granulation system (23) is as follows: 3:250.
8. Use of a dissolving device for potassium fulvate according to claims 1-5 in the preparation of potassium fulvate urea.
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