CN214487853U - Undersize material recovery system of urea granulation packaging unit - Google Patents
Undersize material recovery system of urea granulation packaging unit Download PDFInfo
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- CN214487853U CN214487853U CN202023330236.1U CN202023330236U CN214487853U CN 214487853 U CN214487853 U CN 214487853U CN 202023330236 U CN202023330236 U CN 202023330236U CN 214487853 U CN214487853 U CN 214487853U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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Abstract
The utility model discloses a undersize recovery system of a urea granulation packaging unit, which comprises a conveyor, a dissolving tank and a delivery pump, wherein the inlet end of the conveyor is positioned below the undersize outlet of a screening machine of the urea granulation packaging unit, and the outlet end of the conveyor is communicated with the charging hole of the dissolving tank; the bottom outlet of the dissolving tank is communicated with the inlet pipeline of the delivery pump, the outlet of the delivery pump is divided into two paths, one path is communicated with the top of the dissolving tank through a circulating pipe, and the other path is communicated with the urine tank pipeline of the urea granulation packaging unit through a recovery pipe; the circulating pipe is provided with a circulating control valve, and the recovery pipe is provided with a recovery control valve. The advantages are that: conveying the undersize products to a dissolving tank, injecting water for dissolving, conveying the undersize products to a urine tank of a urea granulation system, and granulating again, so that the yield of granular fertilizer is increased, and the whole economic income is increased; the powdered urea is dissolved by utilizing the steam condensate in the plant area, the dissolution can be accelerated by utilizing the waste heat of the condensate, and the recycling efficiency is improved.
Description
The technical field is as follows:
the utility model relates to a urea production technical field, specifically speaking relate to a urea granulation packaging unit undersize thing recovery system.
Background art:
the urea is raw material coal, which is gasified by using steam and air, generates semi-water gas in a gas generator, purifies the gas by the processes of carbon monoxide conversion, low-temperature methanol washing, synthesis gas compression and the like, removes various impurities, compresses pure nitrogen-hydrogen mixed gas to high pressure, and is commonly called as ammonia under the conditions of high temperature and catalyst existence; the carbon dioxide desorbed from the decarbonization is purified and compressed, then is sent into a urea synthesis tower together with ammonia, is weighed as urea solution at proper temperature and pressure, is stored in a urine tank, and then is evaporated and granulated. In most urea production enterprises, the granulated urea finished product is sieved to ensure that the product has a better particle size, and the undersize product is basically powdery and has low market acceptance degree, so that the undersize product is difficult to sell and is sold at a price which is much lower than that of the original urea, but the undersize product has no difference with the original urea in terms of inherent quality, so that the undersize product causes great economic loss.
The utility model has the following contents:
an object of the utility model is to provide a urea granulation packaging unit undersize thing recovery system is with effectively retrieving the likepowder urea of undersize.
The utility model discloses by following technical scheme implement: a undersize material recovery system of a urea granulation packaging unit comprises a conveyor, a dissolving tank and a conveying pump, wherein the inlet end of the conveyor is positioned below the undersize material outlet of a screening machine of the urea granulation packaging unit, and the outlet end of the conveyor is communicated with the feed inlet of the dissolving tank; the bottom outlet of the dissolving tank is communicated with an inlet pipeline of the conveying pump, the outlet of the conveying pump is divided into two paths, one path is communicated with the top of the dissolving tank through a circulating pipe, and the other path is communicated with a urine tank pipeline of the urea granulation packaging unit through a recovery pipe; a circulation control valve is arranged on the circulation pipe, and a recovery control valve is arranged on the recovery pipe; the output end of the controller is respectively electrically connected with the conveyor, the conveying pump, the circulation control valve and the recovery control valve.
Further, the dissolving tank comprises a tank body, a stirring mechanism is arranged in the tank body, a water injection port and the feed inlet are arranged at the top of the tank body, and a water injection control valve is arranged on the water injection port; a liquid level sensor and a temperature sensor are arranged on the side wall of the tank body, and a heating jacket is arranged on the side wall of the dissolving tank; the liquid level sensor and the temperature sensor are electrically connected with the input end of the controller, and the output end of the controller is electrically connected with the water injection control valve.
Furthermore, the water outlet of the heating jacket is divided into two paths, one path is communicated with the water injection port pipeline through a recycling pipe, and a recycling control valve is installed on the recycling pipe; the other path is communicated with a circulating water system through a pipeline; the output end of the controller is electrically connected with the recycling control valve.
Furthermore, the water injection port is communicated with a steam condensate recovery tank pipeline of the plant area through a pipeline.
Furthermore, an online concentration detector is mounted on the circulating pipe, and the signal output end of the online concentration detector is electrically connected with the input end of the controller.
Furthermore, the device comprises two delivery pumps which are arranged in parallel, stop valves are arranged on the inlet and the outlet of each delivery pump, and the output end of the controller is electrically connected with the stop valves.
Furthermore, a branch pipe is communicated with a pipeline at the inlet end of the delivery pump, a branch pipe control valve is installed on the branch pipe, and the output end of the controller is electrically connected with the branch pipe control valve.
The utility model has the advantages that: conveying the undersize products to a dissolving tank, injecting water for dissolving, conveying the undersize products to a urine tank of a urea granulation system, and granulating again, so that the yield of granular fertilizer is increased, and the whole economic income is increased; the powdered urea is dissolved by utilizing the steam condensate in the plant area, the dissolution can be accelerated by utilizing the waste heat of the condensate, and the recycling efficiency is improved.
Description of the drawings:
fig. 1 is a schematic view of the overall structure of the present invention.
The device comprises a conveyor 1, a dissolving tank 2, a feed inlet 201, a tank body 202, a stirring mechanism 203, a water injection port 204, a water injection control valve 205, a liquid level sensor 206, a temperature sensor 207, a heating jacket 208, a conveying pump 3, a sieving machine 4, a circulating pipe 5, a recovery pipe 6, a urine tank 7, a circulating control valve 8, a recovery control valve 9, a controller 10, a steam condensate recovery tank 11, an online concentration detector 12, a stop valve 13, a branch pipe 14, a branch pipe control valve 15, a reuse pipe 16 and a reuse control valve 17.
The specific implementation mode is as follows:
in the description of the present invention, it should be noted that, as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, but does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" as appearing herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in fig. 1, a undersize recovery system of a urea granulation packaging unit comprises a conveyor 1, a dissolving tank 2 and a conveying pump 3, wherein the inlet end of the conveyor 1 is positioned below the undersize outlet of a screening machine 4 of the urea granulation packaging unit, and the outlet end of the conveyor 1 is communicated with a feed inlet 201 of the dissolving tank 2; the conveyor 1 conveys the powdered urea discharged from the screen underflow outlet of the screening machine 4 to the dissolving tank 2;
the dissolving tank 2 comprises a tank body 202, a stirring mechanism 203 is arranged in the tank body 202, the stirring mechanism 203 is a stirring structure consisting of a motor, a stirring shaft, blades and the like, and is used for stirring the solution so as to accelerate the dissolution of urea; a water injection port 204 and a feed port 201 are installed at the top of the tank body 202, a water injection control valve 205 is installed on the water injection port 204, the water injection port 204 is communicated with an outlet pipeline of a steam condensate recovery tank 11 of a plant area through a pipeline, the steam condensate of the plant area is used for dissolving the powdery urea, the dissolution can be accelerated by using the waste heat of the condensate, and the recovery and utilization efficiency is improved; a liquid level sensor 206 and a temperature sensor 207 are arranged on the side wall of the tank body 202, a heating jacket 208 is arranged on the side wall of the dissolving tank 2, circulating steam is introduced into the heating jacket 208 to heat the dissolving tank 2, and the urea solution in the dissolving tank 2 is prevented from crystallizing due to low temperature; the water outlet of the heating jacket 208 is divided into two paths, one path is communicated with the water injection port 204 through a recycling pipe 16, and a recycling control valve 17 is arranged on the recycling pipe 16; the other path is communicated with a circulating water system through a pipeline; the output end of the controller 10 is electrically connected with a recycling control valve 17; part of water output by the heating jacket 208 is returned to the dissolving tank 2 through the recycling pipe 16, so that the heat is utilized, the dissolving can be accelerated, and the efficiency is improved; the other part of the water output by the heating jacket 208 returns to a circulating water system of the plant area for circulating treatment; the liquid level sensor 206 and the temperature sensor 207 are electrically connected with the input end of the controller 10, the liquid level sensor 206 is used for detecting the liquid level in the dissolving tank 2, the temperature sensor 207 is used for detecting the temperature in the dissolving tank 2, and the output end of the controller 10 is electrically connected with the water injection control valve 205; the liquid level sensor 206 and the temperature sensor 207 respectively upload the monitored liquid level information and temperature information to the controller 10, and a standard liquid level range and a standard temperature range can be set by the controller 10; when the liquid level reaches the standard liquid level range, closing the water injection control valve 205 to stop adding water, and starting the delivery pump 3 to form the circulation of the dissolving tank 2; when the temperature is monitored to be lower than the standard temperature range, the circulation rate of the steam in the heating jacket 208 is accelerated to increase the temperature in the dissolution tank 2;
the bottom outlet of the dissolving tank 2 is communicated with an inlet pipeline of the delivery pump 3, the dissolving tank comprises two delivery pumps 3 which are arranged in parallel, stop valves 13 are respectively arranged on the inlet and the outlet of the delivery pump 3, and the output end of the controller 10 is electrically connected with the stop valves 13; the two delivery pumps 3 are used for standby, when the system runs, the stop valves 13 on the inlet and the outlet of the standby delivery pump 3 are closed, and the stop valves 13 on the inlet and the outlet of the delivery pump 3 in use are opened;
the outlet of the delivery pump 3 is divided into two paths, one path is communicated with the top of the dissolving tank 2 through a circulating pipe 5, and the other path is communicated with a urine tank 7 pipeline of the urea granulation packaging unit through a recovery pipe 6; a circulation control valve 8 is arranged on the circulation pipe 5, and a recovery control valve 9 is arranged on the recovery pipe 6; the output end of the controller 10 is electrically connected with the conveyor 1, the conveying pump 3, the circulation control valve 8 and the recovery control valve 9 respectively. An online concentration detector 12 is mounted on the circulating pipe 5, the signal output end of the online concentration detector 12 is electrically connected with the input end of the controller 10, the online concentration detector 12 can detect the concentration of the liquid in the circulating pipe 5 in real time and upload the detected concentration information to the controller 10, a standard concentration range can be set through the controller 10, and when the detected concentration information exceeds the standard concentration, the recovery control valve 9 is opened to enable part of the solution sent by the delivery pump 3 to enter the urine tank 7 for circulating granulation;
a branch pipe 14 is communicated with a pipeline at the inlet end of the delivery pump 3, a branch pipe control valve 15 is installed on the branch pipe 14, and the output end of the controller 10 is electrically connected with the branch pipe control valve 15; the inlet of the branch pipe 14 can be communicated with the outlet pipeline of the steam condensate recovery tank 11, after the powder recovery is finished, the branch pipe control valve 15 is opened, and the steam condensate is utilized to flush the pipeline between the dissolving tank 2 and the urine tank 7, so that the pipeline is prevented from being blocked by solution crystallization, and the recovery rate of urea is improved.
Instructions for use: before granulation of the urea device, clean water is firstly added into the dissolving tank 2 through a water injection port 204, when the liquid level reaches a standard value, a water injection control valve 205 is closed to stop adding water, a recovery control valve 9 is closed, a circulation control valve 8 is opened, any one of the conveying pumps 3 is started, so that the conveying pump 3 pumps out the solution at the bottom of the dissolving tank 2 and then returns to the dissolving tank 2 through a circulation pipe 5 to form dissolving tank circulation; meanwhile, circulating steam is introduced into the heating jacket 208, and the temperature in the dissolving tank 2 is controlled within a standard temperature range;
then, starting the equipment such as the sieving machine 4, the conveyor 1, the stirring mechanism 203 and the like, after urea granulation, sieving the sieved urea product discharged by the granulating machine, then sieving out undersize products, conveying the urea product to the dissolving tank 2 through the conveyor 1, gradually increasing the concentration value detected by the online concentration detector 12 arranged on the circulating pipe 5, opening the recovery control valve 9 to send the qualified solution back to the urine tank 7 for recycling when the concentration reaches the standard concentration valve, and opening the water injection control valve 205 to replenish water so as to ensure the liquid level of the dissolving tank 2; the opening degrees of the water injection control valve 205 and the recovery control valve 9 are adjusted according to the concentration displayed by the online concentration detector 12, the liquid level of the dissolving tank 2 is controlled to be maintained at about 50%, and the system achieves stable operation after the adjustment is gradually stabilized.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. The undersize material recovery system of the urea granulation packaging unit is characterized by comprising a conveyor, a dissolving tank and a conveying pump, wherein the inlet end of the conveyor is positioned below the undersize material outlet of a screening machine of the urea granulation packaging unit, and the outlet end of the conveyor is communicated with the feed inlet of the dissolving tank; the bottom outlet of the dissolving tank is communicated with an inlet pipeline of the conveying pump, the outlet of the conveying pump is divided into two paths, one path is communicated with the top of the dissolving tank through a circulating pipe, and the other path is communicated with a urine tank pipeline of the urea granulation packaging unit through a recovery pipe; a circulation control valve is arranged on the circulation pipe, and a recovery control valve is arranged on the recovery pipe; the output end of the controller is respectively electrically connected with the conveyor, the conveying pump, the circulation control valve and the recovery control valve.
2. The undersize recovery system for the urea granulation packaging unit as recited in claim 1, wherein the dissolving tank comprises a tank body, a stirring mechanism is installed inside the tank body, a water injection port and the feed inlet are installed at the top of the tank body, and a water injection control valve is installed on the water injection port; a liquid level sensor and a temperature sensor are arranged on the side wall of the tank body, and a heating jacket is arranged on the side wall of the dissolving tank; the liquid level sensor and the temperature sensor are electrically connected with the input end of the controller, and the output end of the controller is electrically connected with the water injection control valve.
3. The undersize recovery system for a urea granulation packaging unit as recited in claim 2, wherein the water outlet of the heating jacket is divided into two paths, one path is communicated with the water inlet pipeline through a recycling pipe, and a recycling control valve is installed on the recycling pipe; the other path is communicated with a circulating water system through a pipeline; the output end of the controller is electrically connected with the recycling control valve.
4. The undersize recovery system for a urea granulation packaging unit as recited in claim 2 or 3, wherein said water injection port is connected to a steam condensate recovery tank pipeline of a plant area through a pipeline.
5. The undersize recovery system of a urea granulation packaging unit as claimed in any one of claims 1 to 3, wherein an on-line concentration detector is mounted on the circulating pipe, and a signal output end of the on-line concentration detector is electrically connected with an input end of the controller.
6. The undersize material recovery system of the urea granulation packaging unit as recited in claim 4, wherein an on-line concentration detector is installed on the circulating pipe, and a signal output end of the on-line concentration detector is electrically connected with an input end of the controller.
7. The undersize recovery system for urea granulation packaging unit as recited in claim 1, 2, 3 or 6, characterized in that it comprises two said delivery pumps arranged in parallel, a stop valve is installed on the inlet and outlet of said delivery pumps, and the output of said controller is electrically connected to said stop valve.
8. The undersize recovery system for urea granulation packaging unit as recited in claim 4, comprising two of said delivery pumps disposed in parallel, wherein a stop valve is installed at each of an inlet and an outlet of said delivery pumps, and an output of said controller is electrically connected to said stop valves.
9. The undersize recovery system for urea granulation packaging unit as recited in claim 5, comprising two of said delivery pumps disposed in parallel, wherein a stop valve is installed at each of an inlet and an outlet of said delivery pumps, and an output of said controller is electrically connected to said stop valves.
10. The undersize recovery system for the urea granulation packaging unit as recited in claim 1, 2, 3, 6, 8 or 9, wherein a branch pipe is connected to the pipeline at the inlet end of the delivery pump, a branch pipe control valve is installed on the branch pipe, and the output end of the controller is electrically connected to the branch pipe control valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023330236.1U CN214487853U (en) | 2020-12-30 | 2020-12-30 | Undersize material recovery system of urea granulation packaging unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023330236.1U CN214487853U (en) | 2020-12-30 | 2020-12-30 | Undersize material recovery system of urea granulation packaging unit |
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| Publication Number | Publication Date |
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| CN214487853U true CN214487853U (en) | 2021-10-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202023330236.1U Active CN214487853U (en) | 2020-12-30 | 2020-12-30 | Undersize material recovery system of urea granulation packaging unit |
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| CN (1) | CN214487853U (en) |
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- 2020-12-30 CN CN202023330236.1U patent/CN214487853U/en active Active
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