CN105585364B - Inferior urea recovery device and recovery method thereof - Google Patents
Inferior urea recovery device and recovery method thereof Download PDFInfo
- Publication number
- CN105585364B CN105585364B CN201610087511.0A CN201610087511A CN105585364B CN 105585364 B CN105585364 B CN 105585364B CN 201610087511 A CN201610087511 A CN 201610087511A CN 105585364 B CN105585364 B CN 105585364B
- Authority
- CN
- China
- Prior art keywords
- urea
- regulating valve
- urea solution
- inlet
- enters
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C9/00—Fertilisers containing urea or urea compounds
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Fertilizers (AREA)
Abstract
The invention belongs to a defective urea recovery device and a recovery method thereof; the device comprises a urea wet dust removal device, an inferior urea storage bin and a large-particle granulation device, wherein an outlet at the bottom of the urea wet dust removal device is connected with a first inlet at the top of a precipitation tank, a turbid liquid outlet at the bottom of the precipitation tank is connected with the large-particle granulation device through a first tee joint and a turbid liquid pump, a clear liquid outlet at the lower part of the precipitation tank is connected with a first inlet of a dissolving kettle through a urine pump and a first regulating valve, the inferior urea storage bin is connected with a second inlet of the dissolving kettle through an inferior urea metering device, a heating device and a stirring device are arranged inside the dissolving kettle, a concentrated urea solution outlet is arranged at the bottom of the dissolving kettle, and the concentrated urea solution outlet is connected with a third end of the first tee joint through a urea solution feed back pump; the method has the advantages of flexible operation, capability of recycling all defective products, reduction of the defective rate of urea, strong market adaptability, capability of adjusting the production amount of urea and compound fertilizer according to market demands and effective reduction of the production cost of enterprises.
Description
Technical Field
The invention belongs to the technical field of defective urea recovery, and particularly relates to a defective urea recovery device and a recovery method thereof.
Background
In the fertilizer production industry, some large-particle massive urea or scar lump urea can appear in the production process, and waste liquid obtained after wet dedusting is adopted for recovering urea dust, solid scar lump urea cannot be treated usually and is generally sold to some compound fertilizer manufacturers at low price, the solid scar lump urea is crushed by the compound fertilizer manufacturers and then used as seed crystal, but the production cost is very unfavorable to reduction, and meanwhile, the waste liquid is evaporated and granulated again through a recovery evaporation system under the general condition, so that the load of the evaporation system is increased, and the steam consumption of the evaporation system is increased.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a defective urea recovery device and a recovery method thereof, which can effectively solve the problem that a large amount of solid waste products and liquid waste products generated in the existing urea production process cannot be treated, have the advantages of low investment and flexible operation, can recover and reuse all defective products, reduce the defective rate of urea, have strong market adaptability and can effectively reduce the production cost of enterprises.
The purpose of the invention is realized as follows: including urea wet dedusting device, substandard product urea warehouse and large granule prilling granulator, the export of urea wet dedusting device bottom links to each other with the first import at precipitation tank top, and the turbid liquid export of precipitation tank bottom links to each other with large granule prilling granulator through first tee bend and turbid liquid pump, and the first import that passes through urine pump and first governing valve and dissolve the cauldron of precipitation tank lower part clear solution export links to each other, and substandard product urea warehouse passes through substandard product urea metering device and dissolves the second import of cauldron and links to each other, the inside of dissolving the cauldron is equipped with heating device and agitating unit, and the bottom of dissolving the cauldron is equipped with dense urea solution export, dense urea solution export links to each other through the third end of urea solution feed back pump with first tee bend.
A second tee joint is arranged between the urea solution feed back pump and a third end of the first tee joint, the third end of the second tee joint is connected with an inlet at the top of the metering tank through a second regulating valve, the upper part of the metering tank is connected with a second inlet at the top of the precipitation tank through an overflow pipeline, the bottom of the metering tank is connected with a third inlet at the top of the precipitation tank through a recovery pipeline, the lower part of the metering tank is connected with a liquid inlet at the top of the reaction kettle through a discharge pipeline, the raw material bin is connected with a feeding hole at the top of the reaction kettle through a metering device, and a discharging hole at the bottom of the reaction kettle is connected with a liquid fertilizer packaging system through a ninth valve; an overflow detection device is arranged on the overflow pipeline, a third regulating valve is arranged on the recovery pipeline, and a fourth regulating valve is arranged on the discharge pipeline; a reaction kettle stirring device and a reaction kettle heating device are arranged in the reaction kettle.
A first valve is arranged between the turbid liquid outlet at the bottom of the settling tank and the first tee joint, and a second valve is arranged between the third end of the first tee joint and the second tee joint; a third valve is arranged between the concentrated urea solution outlet and the urea solution feed back pump.
A recovery method of a defective urea recovery device comprises a urea recovery method, a first urea and liquid fertilizer recovery method and a second urea and liquid fertilizer recovery method;
a. the urea recovery method comprises the following steps:
the method comprises the following steps: dilute urea solution in the urea wet dust removal device enters a precipitation tank through an outlet at the bottom of the urea wet dust removal device and a first inlet at the top of the precipitation tank for precipitation, and the precipitated dilute urea solution comprises lower-layer turbid liquid and upper-layer clear liquid;
step two: the turbid liquid of the lower layer in the step one enters a large particle granulating device for granulation through a turbid liquid outlet at the bottom of the settling tank, a first tee joint and a turbid liquid pump, and can be sold outside after granulation;
step three: the supernatant in the first step enters the dissolving kettle through a supernatant outlet at the lower part of the precipitation tank, a urine pump, a first regulating valve and a first inlet of the dissolving kettle; the defective urea storage bin enters the dissolving kettle through a defective urea metering device and a second inlet of the dissolving kettle; mixing and stirring the two substances in a dissolving kettle, and heating to form a concentrated urea solution;
step four: the concentrated urea solution in the third step enters a first tee joint through a concentrated urea solution outlet, a urea solution feed back pump, a second valve and a third end of the first tee joint, is mixed with the turbid liquid at the lower layer in the first step, enters a large-particle granulating device through a turbid liquid pump, is granulated, and can be sold;
b. the first urea and liquid fertilizer recovery method comprises the following steps:
the method comprises the following steps: dilute urea solution in the urea wet dust removal device enters a precipitation tank through an outlet at the bottom of the urea wet dust removal device and a first inlet at the top of the precipitation tank for precipitation, and the precipitated dilute urea solution comprises lower-layer turbid liquid and upper-layer clear liquid;
step two: the turbid liquid of the lower layer in the step one enters a large particle granulating device for granulation through a turbid liquid outlet at the bottom of the settling tank, a first tee joint and a turbid liquid pump, and can be sold outside after granulation;
step three: the supernatant in the first step enters the dissolving kettle through a supernatant outlet at the lower part of the precipitation tank, a urine pump, a first regulating valve and a first inlet of the dissolving kettle; the defective urea storage bin enters the dissolving kettle through a defective urea metering device and a second inlet of the dissolving kettle; mixing and stirring the two substances in a dissolving kettle, and heating to form a concentrated urea solution;
step four: closing the second valve and opening the second regulating valve, wherein the concentrated urea solution in the third step enters the metering tank through a concentrated urea solution outlet, a urea solution feed back pump, a third end of a second tee joint, the second regulating valve and an inlet at the top of the metering tank; at the moment, the third regulating valve and the fourth regulating valve are both in a closed state;
step five: when the overflow detection device detects that the overflow concentrated urea solution exists in the overflow pipeline, the fourth regulating valve is opened, the second regulating valve is closed, the urea feed back pump stops running, the fourth regulating valve is automatically closed after being opened for 30s, and the concentrated urea solution in the metering tank enters the reaction kettle through a liquid inlet at the top of the reaction kettle; raw materials in the raw material bin enter the reaction kettle through the metering device and a feeding hole in the top of the reaction kettle, the two substances are mixed, stirred and heated in the reaction kettle to form liquid fertilizer, and the liquid fertilizer enters a liquid fertilizer packaging system through a ninth valve to be packaged and sold; the raw material in the raw material bin is one of ammonium nitrate, ammonium phosphate nitrate, potassium sulfate and ammonium dihydrogen phosphate;
step six: when the fourth regulating valve in the fifth step is closed, the fourth step and the fifth step are repeatedly operated;
step seven: when the metering tank is used for 48 hours in the step five and the fourth regulating valve is in an automatic closing state after running for 30 seconds, the third regulating valve is opened, so that the impurity precipitation substances in the metering tank enter the precipitation tank through the recovery pipeline and a third inlet at the top of the precipitation tank for recovery;
c. the second urea and liquid fertilizer recovery method comprises the following steps:
the method comprises the following steps: dilute urea solution in the urea wet dust removal device enters a precipitation tank through an outlet at the bottom of the urea wet dust removal device and a first inlet at the top of the precipitation tank for precipitation, and the precipitated dilute urea solution comprises lower-layer turbid liquid and upper-layer clear liquid;
step two: the turbid liquid of the lower layer in the step one enters a large particle granulating device for granulation through a turbid liquid outlet at the bottom of the settling tank, a first tee joint and a turbid liquid pump, and can be sold outside after granulation;
step three: the supernatant in the first step enters the dissolving kettle through a supernatant outlet at the lower part of the precipitation tank, a urine pump, a first regulating valve and a first inlet of the dissolving kettle; the defective urea storage bin enters the dissolving kettle through a defective urea metering device and a second inlet of the dissolving kettle; mixing and stirring the two substances in a dissolving kettle, and heating to form a concentrated urea solution;
step four: opening a second valve and a second regulating valve, enabling the concentrated urea solution to enter a second tee joint through a concentrated urea solution outlet and a urea solution feed back pump in the third step, dividing the concentrated urea solution into two parts in the second tee joint, enabling one part of the concentrated urea solution to enter a first tee joint through the second valve and a third end of the first tee joint, mixing the part of the concentrated urea solution with the turbid solution on the lower layer in the first step, enabling the mixed solution to enter a large-particle granulating device for granulation, and selling the granulated solution for sale; the other part of the mixture enters the metering tank through a third end of the second tee joint, a second regulating valve and an inlet at the top of the metering tank; at the moment, the third regulating valve and the fourth regulating valve are both in a closed state;
step five: when the overflow detection device detects that the overflow concentrated urea solution exists in the overflow pipeline, the fourth regulating valve is opened, the second regulating valve and the second valve are closed, the urea feed back pump stops running, the fourth regulating valve is automatically closed after being opened for 30s, and the concentrated urea solution in the metering tank enters the reaction kettle through a liquid inlet at the top of the reaction kettle; raw materials in the raw material bin enter the reaction kettle through the metering device and a feeding hole in the top of the reaction kettle, the two substances are mixed, stirred and heated in the reaction kettle to form liquid fertilizer, and the liquid fertilizer enters a liquid fertilizer packaging system through a ninth valve to be packaged and sold; the raw material in the raw material bin is one of ammonium nitrate, ammonium phosphate nitrate, potassium sulfate and ammonium dihydrogen phosphate;
step six: when the fourth regulating valve in the fifth step is closed, the fourth step and the fifth step are repeatedly operated;
step seven: and after the metering tank is used for 48 hours in the step five, when the fourth regulating valve is in an automatic closing state after running for 30 seconds, the third regulating valve is opened, so that the impurity precipitation substances in the metering tank enter the precipitation tank through the recovery pipeline and the third inlet at the top of the precipitation tank for recovery.
The invention utilizes the devices of precipitation, dissolution and the like to carry out centralized recycling on the existing solid inferior urea and liquid inferior urea, solves the problem of inferior recycling in the urea production process, and simultaneously provides a novel device for producing the compound fertilizer.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings, in which like reference numerals refer to like parts throughout. For the sake of simplicity, only the parts relevant to the invention are schematically shown in the drawings, and they do not represent the actual structure as a product.
As shown in figure 1, the device comprises a urea wet dust removal device 1, a defective urea storage bin 16 and a large particle granulation device 7, wherein an outlet at the bottom of the urea wet dust removal device 1 is connected with a first inlet at the top of a precipitation tank 2, a turbid liquid outlet at the bottom of the precipitation tank 2 is connected with the large particle granulation device 7 through a first tee joint 20 and a turbid liquid pump 5, a clear liquid outlet at the lower part of the precipitation tank 2 is connected with a first inlet of a dissolving kettle 12 through a urine pump 9 and a first regulating valve 11, the defective urea storage bin 16 is connected with a second inlet of the dissolving kettle 12 through a defective urea metering device 10, a heating device 13 and a stirring device 14 are arranged inside the dissolving kettle 12, a concentrated urea solution outlet 30 is arranged at the bottom of the dissolving kettle 12, and the concentrated urea solution outlet 30 is connected with a third end of the first tee joint 20 through a urea solution feed back pump 17. A second tee joint 4 is arranged between the urea solution feed back pump 17 and the third end of the first tee joint 20, the third end of the second tee joint 4 is connected with an inlet at the top of a metering tank 22 through a second regulating valve 21, the upper part of the metering tank 22 is connected with a second inlet at the top of a settling tank 2 through an overflow pipeline, the bottom of the metering tank 22 is connected with a third inlet at the top of the settling tank 2 through a recovery pipeline, the lower part of the metering tank 22 is connected with a liquid inlet at the top of a reaction kettle 27 through a discharge pipeline, a raw material bin 8 is connected with a liquid inlet at the top of the reaction kettle 27 through a metering device 6, and a discharge port at the bottom of the reaction kettle 27 is connected with a liquid fertilizer packaging system 18 through a ninth valve 29; an overflow detection device 24 is arranged on the overflow pipeline, a third regulating valve 23 is arranged on the recovery pipeline, and a fourth regulating valve 25 is arranged on the discharge pipeline; a reaction kettle stirring device 28 and a reaction kettle heating device 26 are arranged in the reaction kettle 27. A first valve 3 is arranged between a turbid liquid outlet at the bottom of the precipitation tank 2 and the first tee joint 20, and a second valve 19 is arranged between a third end of the first tee joint 20 and the second tee joint 4; a third valve 15 is provided between the concentrated urea solution outlet 30 and the urea solution recirculation pump 17.
A recovery method of a defective urea recovery device comprises a urea recovery method, a first urea and liquid fertilizer recovery method and a second urea and liquid fertilizer recovery method;
a. the urea recovery method comprises the following steps:
the method comprises the following steps: the dilute urea solution in the urea wet dust removal device 1 enters the precipitation tank 2 for precipitation through an outlet at the bottom of the urea wet dust removal device 1 and a first inlet at the top of the precipitation tank 2, and the precipitated dilute urea solution comprises a lower-layer turbid solution and an upper-layer clear solution;
step two: the turbid liquid at the lower layer in the first step enters a large particle granulating device 7 for granulation through a turbid liquid outlet at the bottom of the precipitation tank 2, a first tee 20 and a turbid liquid pump 5, and can be sold outside after granulation;
step three: the supernatant in the first step enters a dissolving kettle 12 through a supernatant outlet at the lower part of the precipitation tank 2, a urine pump 9, a first regulating valve 11 and a first inlet of the dissolving kettle 12; a defective urea storage bin 16 enters the dissolving kettle 12 through a defective urea metering device 10 and a second inlet of the dissolving kettle 12; the two substances are mixed, stirred and heated in a dissolving kettle 12 to form a concentrated urea solution;
step four: the concentrated urea solution in the third step enters a first tee joint 20 through a concentrated urea solution outlet 30, a urea solution feed back pump 17, a second valve 19 and a third end of the first tee joint 20, is mixed with the turbid solution at the lower layer in the first step, enters a large granule granulation device 7 through a turbid solution pump 5, and is granulated and sold;
b. the first urea and liquid fertilizer recovery method comprises the following steps:
the method comprises the following steps: the dilute urea solution in the urea wet dust removal device 1 enters the precipitation tank 2 for precipitation through an outlet at the bottom of the urea wet dust removal device 1 and a first inlet at the top of the precipitation tank 2, and the precipitated dilute urea solution comprises a lower-layer turbid solution and an upper-layer clear solution;
step two: the turbid liquid at the lower layer in the first step enters a large particle granulating device 7 for granulation through a turbid liquid outlet at the bottom of the precipitation tank 2, a first tee 20 and a turbid liquid pump 5, and can be sold outside after granulation;
step three: the supernatant in the first step enters a dissolving kettle 12 through a supernatant outlet at the lower part of the precipitation tank 2, a urine pump 9, a first regulating valve 11 and a first inlet of the dissolving kettle 12; a defective urea storage bin 16 enters the dissolving kettle 12 through a defective urea metering device 10 and a second inlet of the dissolving kettle 12; the two substances are mixed, stirred and heated in a dissolving kettle 12 to form a concentrated urea solution;
step four: closing the second valve 19 and opening the second regulating valve 21, wherein the concentrated urea solution in the third step enters the metering tank 22 through the concentrated urea solution outlet 30, the urea solution feed back pump 17, the third end of the second tee joint 4, the second regulating valve 21 and the inlet at the top of the metering tank 22; at this time, the third regulating valve 23 and the fourth regulating valve 25 are both in a closed state;
step five: when the overflow detection device 24 detects that the overflow concentrated urea solution exists in the overflow pipeline, the fourth regulating valve 25 is opened, the second regulating valve 21 is closed, the urea feed back pump 17 stops running, wherein the fourth regulating valve 25 is automatically closed after being opened for 30s, and the concentrated urea solution in the metering tank 22 enters the reaction kettle 27 through a liquid inlet at the top of the reaction kettle 27; the raw materials in the raw material bin 8 enter the reaction kettle 27 through the metering device 6 and a feeding hole at the top of the reaction kettle 27, the two substances are mixed, stirred and heated in the reaction kettle 27 to form liquid fertilizer, and the liquid fertilizer enters the liquid fertilizer packaging system 18 through the ninth valve 29 for packaging and can be sold; the raw material in the raw material bin 8 is one of ammonium nitrate, ammonium phosphate nitrate, potassium sulfate and ammonium dihydrogen phosphate;
step six: when the fourth regulating valve 25 in the fifth step is closed, the fourth step and the fifth step are repeatedly operated;
step seven: after the metering tank 22 is used for 48 hours in the fifth step, when the fourth regulating valve 25 is in an automatic closing state after running for 30 seconds, the third regulating valve 23 is opened, so that the impurity precipitation substances in the metering tank 22 enter the precipitation tank 2 through the recovery pipeline and a third inlet at the top of the precipitation tank 2 for recovery;
c. the second urea and liquid fertilizer recovery method comprises the following steps:
the method comprises the following steps: the dilute urea solution in the urea wet dust removal device 1 enters the precipitation tank 2 for precipitation through an outlet at the bottom of the urea wet dust removal device 1 and a first inlet at the top of the precipitation tank 2, and the precipitated dilute urea solution comprises a lower-layer turbid solution and an upper-layer clear solution;
step two: the turbid liquid at the lower layer in the first step enters a large particle granulating device 7 for granulation through a turbid liquid outlet at the bottom of the precipitation tank 2, a first tee 20 and a turbid liquid pump 5, and can be sold outside after granulation;
step three: the supernatant in the first step enters a dissolving kettle 12 through a supernatant outlet at the lower part of the precipitation tank 2, a urine pump 9, a first regulating valve 11 and a first inlet of the dissolving kettle 12; a defective urea storage bin 16 enters the dissolving kettle 12 through a defective urea metering device 10 and a second inlet of the dissolving kettle 12; the two substances are mixed, stirred and heated in a dissolving kettle 12 to form a concentrated urea solution;
step four: opening a second valve 19 and a second regulating valve 21, enabling the concentrated urea solution in the third step to enter a second tee joint 4 through a concentrated urea solution outlet 30 and a urea solution feed back pump 17, dividing the concentrated urea solution into two parts in the second tee joint 4, enabling one part of the concentrated urea solution to enter a first tee joint 20 through the second valve 19 and a third end of the first tee joint 20, mixing the concentrated urea solution with the lower-layer turbid solution in the first step, enabling the turbid solution to enter a large-particle granulating device 7 for granulation, and enabling the granulated solution to be sold outside; the other part enters the metering groove 22 through the third end of the second tee joint 4, the second regulating valve 21 and an inlet at the top of the metering groove 22; at this time, the third regulating valve 23 and the fourth regulating valve 25 are both in a closed state;
step five: when the overflow detection device 24 detects that the overflow concentrated urea solution exists in the overflow pipeline, the fourth regulating valve 25 is opened, the second regulating valve 21 and the second valve 19 are closed, the urea feed back pump 17 stops running, wherein the fourth regulating valve 25 is automatically closed after being opened for 30s, and the concentrated urea solution in the metering tank 22 enters the reaction kettle 27 through a liquid inlet at the top of the reaction kettle 27; the raw materials in the raw material bin 8 enter the reaction kettle 27 through the metering device 6 and a feeding hole at the top of the reaction kettle 27, the two substances are mixed, stirred and heated in the reaction kettle 27 to form liquid fertilizer, and the liquid fertilizer enters the liquid fertilizer packaging system 18 through the ninth valve 29 for packaging and can be sold; the raw material in the raw material bin 8 is one of ammonium nitrate, ammonium phosphate nitrate, potassium sulfate and ammonium dihydrogen phosphate;
step six: when the fourth regulating valve 25 in the fifth step is closed, the fourth step and the fifth step are repeatedly operated;
step seven: and when the fourth regulating valve 25 is in an automatic closing state after running for 30s after the metering tank 22 is used for 48h in the step five, the third regulating valve 23 is opened, so that the impurity precipitation substances in the metering tank 22 enter the precipitation tank 2 through the recovery pipeline and a third inlet at the top of the precipitation tank 2 for recovery.
The present invention will now be further illustrated with reference to examples in order to explain the present invention in more detail. The specific embodiment is as follows:
example one
The invention can adjust the produced products according to the market demands, and when only urea needs to be produced, the production process of the invention is as follows:
a recovery method of a defective urea recovery device comprises the following steps:
the method comprises the following steps: the dilute urea solution in the urea wet dust removal device 1 enters the precipitation tank 2 for precipitation through an outlet at the bottom of the urea wet dust removal device 1 and a first inlet at the top of the precipitation tank 2, and the precipitated dilute urea solution comprises a lower-layer turbid solution and an upper-layer clear solution;
step two: the turbid liquid at the lower layer in the first step enters a large particle granulating device 7 for granulation through a turbid liquid outlet at the bottom of the precipitation tank 2, a first tee 20 and a turbid liquid pump 5, and can be sold outside after granulation;
step three: the supernatant in the first step enters a dissolving kettle 12 through a supernatant outlet at the lower part of the precipitation tank 2, a urine pump 9, a first regulating valve 11 and a first inlet of the dissolving kettle 12; a defective urea storage bin 16 enters the dissolving kettle 12 through a defective urea metering device 10 and a second inlet of the dissolving kettle 12; the two substances are mixed, stirred and heated in a dissolving kettle 12 to form a concentrated urea solution;
step four: the concentrated urea solution in the third step enters a first tee joint 20 through a concentrated urea solution outlet 30, a urea solution feed back pump 17, a second valve 19 and a third end of the first tee joint 20, is mixed with the turbid solution at the lower layer in the first step, enters a large granule granulation device 7 through a turbid solution pump 5, and is granulated and sold;
example two
The invention can adjust the produced products according to the market demands, when large-scale production of compound fertilizer and small-scale production of urea are needed, the production process of the invention is as follows:
a recovery method of a defective urea recovery device comprises a first urea and liquid fertilizer recovery method, and comprises the following steps:
the method comprises the following steps: the dilute urea solution in the urea wet dust removal device 1 enters the precipitation tank 2 for precipitation through an outlet at the bottom of the urea wet dust removal device 1 and a first inlet at the top of the precipitation tank 2, and the precipitated dilute urea solution comprises a lower-layer turbid solution and an upper-layer clear solution;
step two: the turbid liquid at the lower layer in the first step enters a large particle granulating device 7 for granulation through a turbid liquid outlet at the bottom of the precipitation tank 2, a first tee 20 and a turbid liquid pump 5, and can be sold outside after granulation;
step three: the supernatant in the first step enters a dissolving kettle 12 through a supernatant outlet at the lower part of the precipitation tank 2, a urine pump 9, a first regulating valve 11 and a first inlet of the dissolving kettle 12; a defective urea storage bin 16 enters the dissolving kettle 12 through a defective urea metering device 10 and a second inlet of the dissolving kettle 12; the two substances are mixed, stirred and heated in a dissolving kettle 12 to form a concentrated urea solution;
step four: closing the second valve 19 and opening the second regulating valve 21, wherein the concentrated urea solution in the third step enters the metering tank 22 through the concentrated urea solution outlet 30, the urea solution feed back pump 17, the third end of the second tee joint 4, the second regulating valve 21 and the inlet at the top of the metering tank 22; at this time, the third regulating valve 23 and the fourth regulating valve 25 are both in a closed state;
step five: when the overflow detection device 24 detects that the overflow concentrated urea solution exists in the overflow pipeline, the fourth regulating valve 25 is opened, the second regulating valve 21 is closed, the urea feed back pump 17 stops running, wherein the fourth regulating valve 25 is automatically closed after being opened for 30s, and the concentrated urea solution in the metering tank 22 enters the reaction kettle 27 through a liquid inlet at the top of the reaction kettle 27; the raw materials in the raw material bin 8 enter the reaction kettle 27 through the metering device 6 and a feeding hole at the top of the reaction kettle 27, the two substances are mixed, stirred and heated in the reaction kettle 27 to form liquid fertilizer, and the liquid fertilizer enters the liquid fertilizer packaging system 18 through the ninth valve 29 for packaging and can be sold; the raw material in the raw material bin 8 is one of ammonium nitrate, ammonium phosphate nitrate, potassium sulfate and ammonium dihydrogen phosphate;
step six: when the fourth regulating valve 25 in the fifth step is closed, the fourth step and the fifth step are repeatedly operated;
step seven: and when the fourth regulating valve 25 is in an automatic closing state after running for 30s after the metering tank 22 is used for 48h in the step five, the third regulating valve 23 is opened, so that the impurity precipitation substances in the metering tank 22 enter the precipitation tank 2 through the recovery pipeline and a third inlet at the top of the precipitation tank 2 for recovery.
EXAMPLE III
The invention can adjust the produced products according to the market demand, and when the compound fertilizer and the urea are required to be produced simultaneously, the production process of the invention is as follows:
a recovery method of a defective urea recovery device comprises a second urea and liquid fertilizer recovery method, and comprises the following steps:
the method comprises the following steps: the dilute urea solution in the urea wet dust removal device 1 enters the precipitation tank 2 for precipitation through an outlet at the bottom of the urea wet dust removal device 1 and a first inlet at the top of the precipitation tank 2, and the precipitated dilute urea solution comprises a lower-layer turbid solution and an upper-layer clear solution;
step two: the turbid liquid at the lower layer in the first step enters a large particle granulating device 7 for granulation through a turbid liquid outlet at the bottom of the precipitation tank 2, a first tee 20 and a turbid liquid pump 5, and can be sold outside after granulation;
step three: the supernatant in the first step enters a dissolving kettle 12 through a supernatant outlet at the lower part of the precipitation tank 2, a urine pump 9, a first regulating valve 11 and a first inlet of the dissolving kettle 12; a defective urea storage bin 16 enters the dissolving kettle 12 through a defective urea metering device 10 and a second inlet of the dissolving kettle 12; the two substances are mixed, stirred and heated in a dissolving kettle 12 to form a concentrated urea solution;
step four: opening a second valve 19 and a second regulating valve 21, enabling the concentrated urea solution in the third step to enter a second tee joint 4 through a concentrated urea solution outlet 30 and a urea solution feed back pump 17, dividing the concentrated urea solution into two parts in the second tee joint 4, enabling one part of the concentrated urea solution to enter a first tee joint 20 through the second valve 19 and a third end of the first tee joint 20, mixing the concentrated urea solution with the lower-layer turbid solution in the first step, enabling the turbid solution to enter a large-particle granulating device 7 for granulation, and enabling the granulated solution to be sold outside; the other part enters the metering groove 22 through the third end of the second tee joint 4, the second regulating valve 21 and an inlet at the top of the metering groove 22; at this time, the third regulating valve 23 and the fourth regulating valve 25 are both in a closed state;
step five: when the overflow detection device 24 detects that the overflow concentrated urea solution exists in the overflow pipeline, the fourth regulating valve 25 is opened, the second regulating valve 21 and the second valve 19 are closed, the urea feed back pump 17 stops running, wherein the fourth regulating valve 25 is automatically closed after being opened for 30s, and the concentrated urea solution in the metering tank 22 enters the reaction kettle 27 through a liquid inlet at the top of the reaction kettle 27; the raw materials in the raw material bin 8 enter the reaction kettle 27 through the metering device 6 and a feeding hole at the top of the reaction kettle 27, the two substances are mixed, stirred and heated in the reaction kettle 27 to form liquid fertilizer, and the liquid fertilizer enters the liquid fertilizer packaging system 18 through the ninth valve 29 for packaging and can be sold; the raw material in the raw material bin 8 is one of ammonium nitrate, ammonium phosphate nitrate, potassium sulfate and ammonium dihydrogen phosphate;
step six: when the fourth regulating valve 25 in the fifth step is closed, the fourth step and the fifth step are repeatedly operated;
step seven: and when the fourth regulating valve 25 is in an automatic closing state after running for 30s after the metering tank 22 is used for 48h in the step five, the third regulating valve 23 is opened, so that the impurity precipitation substances in the metering tank 22 enter the precipitation tank 2 through the recovery pipeline and a third inlet at the top of the precipitation tank 2 for recovery.
The invention can produce various compound fertilizers, and can be adjusted by the raw materials in the raw material bin 8, and the raw materials in the raw material bin 8 are one of ammonium nitrate, ammonium phosphate nitrate, potassium sulfate and ammonium dihydrogen phosphate.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," and the like are to be construed broadly and may be, for example, fixedly connected, integrally connected, or detachably connected; or communication between the interior of the two elements; they may be directly connected or indirectly connected through an intermediate, and those skilled in the art can understand the specific meaning of the above terms in the present invention according to specific situations. The above detailed description is only specific to possible embodiments of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments, modifications, and alterations without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (4)
1. The utility model provides an substandard product urea recovery unit, includes urea wet dedusting device (1), substandard product urea storage storehouse (16) and large granule prilling granulator (7), its characterized in that: the export of urea wet dedusting device (1) bottom links to each other with the first import at precipitation tank (2) top, and precipitation tank (2) bottom turbid liquid export links to each other with large granule prilling granulator (7) through first tee bend (20) and turbid liquid pump (5), and precipitation tank (2) lower part clear liquid export links to each other through urine pump (9) and first governing valve (11) and the first import of dissolving cauldron (12), and substandard product urea storage storehouse (16) link to each other through the second import of substandard product urea metering device (10) and dissolving cauldron (12), the inside of dissolving cauldron (12) is equipped with heating device (13) and agitating unit (14), and the bottom of dissolving cauldron (12) is equipped with concentrated urea solution export (30), concentrated urea solution export (30) link to each other through the third end of urea solution feed back pump (17) with first tee bend (20).
2. The defective urea recovery device according to claim 1, wherein: a second tee joint (4) is arranged between the urea solution feed back pump (17) and the third end of the first tee joint (20), the third end of the second tee joint (4) is connected with an inlet at the top of a metering tank (22) through a second regulating valve (21), the upper part of the metering tank (22) is connected with a second inlet at the top of a settling tank (2) through an overflow pipeline, the bottom of the metering tank (22) is connected with a third inlet at the top of the settling tank (2) through a recovery pipeline, the lower part of the metering tank (22) is connected with a liquid inlet at the top of a reaction kettle (27) through a discharge pipeline, a raw material bin (8) is connected with a feed inlet at the top of the reaction kettle (27) through a metering device (6), and a discharge outlet at the bottom of the reaction kettle (27) is connected with a liquid fertilizer packaging system (18) through a ninth valve (29); an overflow detection device (24) is arranged on the overflow pipeline, a third regulating valve (23) is arranged on the recovery pipeline, and a fourth regulating valve (25) is arranged on the discharge pipeline; a reaction kettle stirring device (28) and a reaction kettle heating device (26) are arranged in the reaction kettle (27).
3. The defective urea recovery device according to claim 2, wherein: a first valve (3) is arranged between a turbid liquid outlet at the bottom of the precipitation tank (2) and the first tee joint (20), and a second valve (19) is arranged between a third end of the first tee joint (20) and the second tee joint (4); a third valve (15) is arranged between the concentrated urea solution outlet (30) and the urea solution feed back pump (17).
4. A recovery method of a defective urea recovery device is characterized in that: the recovery method comprises a urea recovery method, a first urea and liquid fertilizer recovery method and a second urea and liquid fertilizer recovery method;
a. the urea recovery method comprises the following steps:
the method comprises the following steps: dilute urea solution in the urea wet dust removal device (1) enters the precipitation tank (2) through an outlet at the bottom of the urea wet dust removal device (1) and a first inlet at the top of the precipitation tank (2) for precipitation, and the precipitated dilute urea solution comprises lower-layer turbid liquid and upper-layer clear liquid;
step two: the turbid liquid at the lower layer in the step one enters a large particle granulating device (7) through a turbid liquid outlet at the bottom of the precipitation tank (2), a first tee joint (20) and a turbid liquid pump (5) for granulation, and the granulated liquid can be sold outside;
step three: in the first step, the supernatant enters the dissolving kettle (12) through a supernatant outlet at the lower part of the precipitation tank (2), the urine pump (9), the first regulating valve (11) and a first inlet of the dissolving kettle (12); a defective urea storage bin (16) enters the dissolving kettle (12) through a defective urea metering device (10) and a second inlet of the dissolving kettle (12); mixing and stirring the two substances in a dissolving kettle (12) and heating to form a concentrated urea solution;
step four: in the third step, the concentrated urea solution enters a first tee joint (20) through a concentrated urea solution outlet (30), a urea solution feed back pump (17), a second valve (19) and a third end of the first tee joint (20), and enters a large particle granulation device (7) for granulation after being mixed with the lower-layer turbid solution in the first step, and the turbid solution is sold outside after granulation;
b. the first urea and liquid fertilizer recovery method comprises the following steps:
the method comprises the following steps: dilute urea solution in the urea wet dust removal device (1) enters the precipitation tank (2) through an outlet at the bottom of the urea wet dust removal device (1) and a first inlet at the top of the precipitation tank (2) for precipitation, and the precipitated dilute urea solution comprises lower-layer turbid liquid and upper-layer clear liquid;
step two: the turbid liquid at the lower layer in the step one enters a large particle granulating device (7) through a turbid liquid outlet at the bottom of the precipitation tank (2), a first tee joint (20) and a turbid liquid pump (5) for granulation, and the granulated liquid can be sold outside;
step three: in the first step, the supernatant enters the dissolving kettle (12) through a supernatant outlet at the lower part of the precipitation tank (2), the urine pump (9), the first regulating valve (11) and a first inlet of the dissolving kettle (12); a defective urea storage bin (16) enters the dissolving kettle (12) through a defective urea metering device (10) and a second inlet of the dissolving kettle (12); mixing and stirring the two substances in a dissolving kettle (12) and heating to form a concentrated urea solution;
step four: closing the second valve (19) and opening the second regulating valve (21), wherein the concentrated urea solution in the step three enters the metering tank (22) through a concentrated urea solution outlet (30), a urea solution feed back pump (17), a third end of the second tee joint (4), the second regulating valve (21) and an inlet at the top of the metering tank (22); at the moment, the third regulating valve (23) and the fourth regulating valve (25) are both in a closed state;
step five: when the overflow detection device (24) detects that the overflow concentrated urea solution exists in the overflow pipeline, the fourth regulating valve (25) is opened, the second regulating valve (21) is closed, the urea feed back pump (17) stops running, wherein the fourth regulating valve (25) is automatically closed after being opened for 30s, and the concentrated urea solution in the metering tank (22) enters the reaction kettle (27) through a liquid inlet at the top of the reaction kettle (27); raw materials in the raw material bin (8) enter the reaction kettle (27) through the metering device (6) and a feeding hole at the top of the reaction kettle (27), the two substances are mixed, stirred and heated in the reaction kettle (27) to form liquid fertilizer, and the liquid fertilizer enters the liquid fertilizer packaging system (18) through the ninth valve (29) to be packaged and sold; the raw material in the raw material bin (8) is one of ammonium nitrate, ammonium phosphate nitrate, potassium sulfate and ammonium dihydrogen phosphate;
step six: when the fourth regulating valve (25) in the fifth step is closed, the fourth step and the fifth step are repeatedly operated;
step seven: when the metering tank (22) is used for 48 hours in the fifth step and the fourth regulating valve (25) is in an automatic closing state after running for 30 seconds, the third regulating valve (23) is opened, so that the impurity precipitation substances in the metering tank (22) enter the precipitation tank (2) through the recovery pipeline and a third inlet at the top of the precipitation tank (2) for recovery and use;
c. the second urea and liquid fertilizer recovery method comprises the following steps:
the method comprises the following steps: dilute urea solution in the urea wet dust removal device (1) enters the precipitation tank (2) through an outlet at the bottom of the urea wet dust removal device (1) and a first inlet at the top of the precipitation tank (2) for precipitation, and the precipitated dilute urea solution comprises lower-layer turbid liquid and upper-layer clear liquid;
step two: the turbid liquid at the lower layer in the step one enters a large particle granulating device (7) through a turbid liquid outlet at the bottom of the precipitation tank (2), a first tee joint (20) and a turbid liquid pump (5) for granulation, and the granulated liquid can be sold outside;
step three: in the first step, the supernatant enters the dissolving kettle (12) through a supernatant outlet at the lower part of the precipitation tank (2), the urine pump (9), the first regulating valve (11) and a first inlet of the dissolving kettle (12); a defective urea storage bin (16) enters the dissolving kettle (12) through a defective urea metering device (10) and a second inlet of the dissolving kettle (12); mixing and stirring the two substances in a dissolving kettle (12) and heating to form a concentrated urea solution;
step four: opening a second valve (19) and a second regulating valve (21), enabling the concentrated urea solution to enter a second tee joint (4) through a concentrated urea solution outlet (30) and a urea solution feed back pump (17) in the third step, dividing the concentrated urea solution into two parts in the second tee joint (4), enabling one part of the concentrated urea solution to enter a first tee joint (20) through the second valve (19) and a third end of the first tee joint (20), mixing the concentrated urea solution with the lower-layer turbid solution in the first step, enabling the turbid solution to enter a large-particle granulating device (7) for granulation, and enabling the granulated solution to be sold outside; the other part of the mixture enters the metering tank (22) through a third end of the second tee joint (4), a second regulating valve (21) and an inlet at the top of the metering tank (22); at the moment, the third regulating valve (23) and the fourth regulating valve (25) are both in a closed state;
step five: when the overflow detection device (24) detects that the overflow concentrated urea solution exists in the overflow pipeline, the fourth regulating valve (25) is opened, the second regulating valve (21) and the second valve (19) are closed, the urea feed back pump (17) stops running, the fourth regulating valve (25) is automatically closed after being opened for 30s, and the concentrated urea solution in the metering tank (22) enters the reaction kettle (27) through a liquid inlet at the top of the reaction kettle (27); raw materials in the raw material bin (8) enter the reaction kettle (27) through the metering device (6) and a feeding hole at the top of the reaction kettle (27), the two substances are mixed, stirred and heated in the reaction kettle (27) to form liquid fertilizer, and the liquid fertilizer enters the liquid fertilizer packaging system (18) through the ninth valve (29) to be packaged and sold; the raw material in the raw material bin (8) is one of ammonium nitrate, ammonium phosphate nitrate, potassium sulfate and ammonium dihydrogen phosphate;
step six: when the fourth regulating valve (25) in the fifth step is closed, the fourth step and the fifth step are repeatedly operated;
step seven: and (5) when the fourth regulating valve (25) is in an automatic closing state after the metering tank (22) is used for 48 hours in the step five and the operation is carried out for 30 seconds, opening the third regulating valve (23) to enable the impurity precipitation substances in the metering tank (22) to enter the precipitation tank (2) for recycling through a recycling pipeline and a third inlet at the top of the precipitation tank (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610087511.0A CN105585364B (en) | 2016-02-04 | 2016-02-04 | Inferior urea recovery device and recovery method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610087511.0A CN105585364B (en) | 2016-02-04 | 2016-02-04 | Inferior urea recovery device and recovery method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105585364A CN105585364A (en) | 2016-05-18 |
| CN105585364B true CN105585364B (en) | 2022-01-28 |
Family
ID=55925308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610087511.0A Active CN105585364B (en) | 2016-02-04 | 2016-02-04 | Inferior urea recovery device and recovery method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105585364B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106187328A (en) * | 2016-07-07 | 2016-12-07 | 安徽淮化股份有限公司 | A kind of method and apparatus that defective urea product is dissolved loopback pelletize again |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1953137A1 (en) * | 2007-02-02 | 2008-08-06 | Urea Casale S.A. | Process and plant for the production of an aqueous solution comprising urea |
| CN203923062U (en) * | 2014-06-12 | 2014-11-05 | 中化重庆涪陵化工有限公司 | Substandard products urea recovery and processing system |
| CN205398503U (en) * | 2016-02-04 | 2016-07-27 | 河南心连心化肥有限公司 | Substandard product urea recovery unit |
-
2016
- 2016-02-04 CN CN201610087511.0A patent/CN105585364B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN105585364A (en) | 2016-05-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102863281B (en) | Method for producing high-tower nitro-sulfenyl compound fertilizer and production system applying method | |
| CN104355772A (en) | Preparation method and preparation device of compound fertilizer | |
| CN105585364B (en) | Inferior urea recovery device and recovery method thereof | |
| CN110668875A (en) | Production method of high-sulfur full-water-soluble nitro-sulfur-based nitrogen fertilizer granules | |
| CN205398503U (en) | Substandard product urea recovery unit | |
| CN202390333U (en) | Compound fertilizer production device dispensing with fillers | |
| CN207254245U (en) | A kind of device for configuring urea ammonium nitrate solution | |
| CN205653356U (en) | Gather peptide chelate potassium zinc urea fertilizer preparation facilities | |
| CN206767954U (en) | A kind of chemical fertilizer production line | |
| CN101580413A (en) | Systematic integration optimization method based on high tower fused melt granulated compound fertilizer technology | |
| CN100546951C (en) | The industrialized preparing process of sulfur coated controlled release fertilizer and device | |
| CN106831002A (en) | A kind of granular double superhosphate energy-saving production method | |
| CN218530853U (en) | Urea sulfate liquid synthesis process equipment | |
| CN113860971A (en) | Continuous production process of one-step method slurry-melting chelating active humic acid compound fertilizer | |
| CN212806671U (en) | Discharging self-circulation solid particle flow plate cooler | |
| CN201276503Y (en) | Industrial production apparatus for sulfur coated controlled release fertilizer | |
| CN1236998C (en) | Processing for granular sodium sulfide | |
| CN107626255A (en) | A kind of device and collocation method for configuring urea ammonium nitrate solution | |
| CN203639360U (en) | Slow/controlled-release fertilizer production system | |
| CN206109242U (en) | Preparation facilities of mixed ground paste of compound fertilizer | |
| CN213357394U (en) | Compound fertilizer production equipment | |
| CN219129215U (en) | High tower production system of ammonium nitrate calcium fertilizer | |
| CN1182066A (en) | Composite fertilizer producing technology and equipment by dissolving spraying and pelletizing ammonium nitrate | |
| CN110128209B (en) | High-tower compound fertilizer production device and production process | |
| CN204237724U (en) | A kind of multi-hole nitramines lumps in producing the recycling device of ammonium nitrate |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 453731 Xinxiang Economic Development Zone, Henan Province (Xiaoji Town) Applicant after: Henan Xinlianxin Chemical Industry Group Co., Ltd. Address before: 453731 Henan Xinxiang Economic Development Zone Xiaoji Town Henan Xinlianxin Chemical Fertilizer Co., Ltd. Applicant before: Henan XInlianxin Fertiliser Limited Company |
|
| CB02 | Change of applicant information | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |