CN210197871U - System for drying ammonium sulfate by gas closed cycle - Google Patents
System for drying ammonium sulfate by gas closed cycle Download PDFInfo
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- CN210197871U CN210197871U CN201920622162.7U CN201920622162U CN210197871U CN 210197871 U CN210197871 U CN 210197871U CN 201920622162 U CN201920622162 U CN 201920622162U CN 210197871 U CN210197871 U CN 210197871U
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Abstract
The utility model relates to a system for drying ammonium sulfate by gas closed cycle, which comprises a vibrating fluidized bed, a gas heater, an ammonium sulfate storage hopper, a cyclone separator, a tail gas fan and a tail gas condensing cooler; the vibrated fluidized bed is connected with the cyclone separator and the tail gas condensation cooler in sequence through a tail gas output pipeline, a low-temperature dry gas outlet of the tail gas condensation cooler is connected with a dry section gas inlet and a cooling section gas inlet of the vibrated fluidized bed respectively through a circulating gas pipeline, and a gas heater is arranged on a branch of the circulating gas pipeline connected with the dry section gas inlet. The utility model discloses in, tail gas behind the dry ammonium sulfate is used as the gaseous medium circulation of dry ammonium sulfate after cooling, dehumidification, has realized the closed cyclic utilization of gaseous in the system, when guaranteeing the dry quality of ammonium sulfate product, has avoided ambient air condition to the unstable factor influence of drying operation, has avoided the pollution of tail gas to the environment simultaneously, and technology is simple and easy, is friendly to the environment.
Description
Technical Field
The utility model relates to an ammonium sulfate production technical field especially relates to a system of dry ammonium sulfate of gaseous closed cycle.
Background
The conventional process for producing ammonium sulfate products by using a coal gas purification device in a coking plant is to absorb ammonia in coal gas by using acid ammonium sulfate mother liquor to generate ammonium sulfate, and then the ammonium sulfate is crystallized by a crystallization tank, mechanically dewatered by a centrifugal machine and dried by a vibrating fluidized bed to obtain the ammonium sulfate products. The conventional process flow adopted when drying ammonium sulfate is as follows: and (3) drying the ammonium sulfate mechanically dewatered by the centrifugal machine in a vibrating fluidized bed by using air as a drying medium, pressurizing the air by using an air fan and heating the air by using an air heater, conveying the air to a drying section of the vibrating fluidized bed to dry the ammonium sulfate, and cooling the dried ammonium sulfate in a cooling section by using air introduced by a cold air fan to obtain an ammonium sulfate product. And after the ammonium sulfate dust carried by the waste gas generated in the drying section and the cooling section is separated by a cyclone separator, the waste gas is pressurized by a tail gas induced draft fan, enters an exhaust cleaning tower, is sprayed, washed and dedusted, and is purified by a mist separator and then is exhausted to the atmosphere.
With the national requirement for environmental protection becoming higher and higher (GB16171-2012 discharge Standard for pollutants in coking chemistry industry for coking) and the concentration value of tail gas discharged by ammonium sulfate crystallization drying, in the currently generally adopted ammonium sulfate drying method, the tail gas after cyclone separator is not allowed to be directly discharged, and the subsequent addition of a gas purification treatment process not only makes the process complicated and tedious, but also is influenced by environmental conditions and operating conditions, and is difficult to stably control the content of particles discharged from the tail gas and the content of ammonia to meet the emission limit value of relevant specifications, thereby finally polluting the environment.
Application number is 201410236298.6's chinese patent discloses a "cyclic utilization system to dry for ammonium sulfate vibration fluidized bed dryer tail gas", through discharging the part to original system tail gas and transforming, collect the tail gas of vibration fluidized bed dryer each section department respectively alone, remove dust, the heat transfer is retrieved, but it has mainly realized the thermal recovery to the tail gas, and its tail gas is separating out the thiamine dust through cyclone, directly arrange through the chimney outward behind the heat pipe heat exchanger heat transfer again, not only do not realize gaseous cyclic utilization, and tail gas emission also hardly reaches standard.
Disclosure of Invention
The utility model provides a system of gaseous closed cycle dry ammonium sulfate, tail gas behind the dry ammonium sulfate is used as the gaseous medium circulation of dry ammonium sulfate after cooling, dehumidification, has realized the closed cycle of gaseous in the system and has utilized, when guaranteeing the dry quality of ammonium sulfate product, has avoided the unstable factor influence of ambient air condition to dry operation, has avoided the pollution of tail gas to the environment simultaneously, and simple process is easy, friendly to the environment.
In order to achieve the purpose, the invention adopts the following technical scheme:
a system for realizing the method for drying ammonium sulfate by closed gas circulation comprises a vibrating fluidized bed, a gas heater, an ammonium sulfate storage hopper, a cyclone separator and a tail gas fan; the tail gas condensation cooler is also included; the vibrating fluidized bed is connected with an air inlet of the cyclone separator through a tail gas output pipeline, a finished ammonium sulfate outlet of the vibrating fluidized bed and an ammonium sulfate dust outlet at the bottom of the cyclone separator are respectively connected with an ammonium sulfate storage hopper, a tail gas outlet at the top of the cyclone separator is connected with a gas inlet of a tail gas condensation cooler through a tail gas conveying pipeline, and a tail gas fan is arranged on the tail gas conveying pipeline; the tail gas condensing cooler is provided with a condensate outlet and a low-temperature dry gas outlet, the low-temperature dry gas outlet is respectively connected with a dry section gas inlet and a cooling section gas inlet of the vibrated fluidized bed through a circulating gas pipeline, and a gas heater is arranged on a branch of the circulating gas pipeline connected with the dry section gas inlet.
The circulating gas pipeline is provided with a temperature measuring device at one end close to the tail gas condensation cooler, an inlet electric regulating valve is arranged on a cooling medium inlet pipeline of the tail gas condensation cooler, and the inlet electric regulating valve and the temperature measuring device are controlled in an interlocking mode through a control system.
And a liquid level measuring device is arranged at the lower part of the tail gas condensation cooler, an outlet electric regulating valve is arranged on a condensate outlet pipeline of the tail gas condensation cooler, and the outlet electric regulating valve and the liquid level measuring device are controlled in an interlocking manner through a control system.
The tail gas condensation cooler is a dividing wall type cooler.
Compared with the prior art, the beneficial effects of the utility model are that:
1) the closed-loop recycling of gas in the system is realized, no tail gas is discharged, the pollution of the tail gas to the environment is avoided, and the environment is protected;
2) besides air is required to be introduced when the system starts to operate, the ammonium sulfate is dried by circulating gas in the operation process of the system, so that the drying quality of an ammonium sulfate product is ensured, and the influence of the ambient air condition on unstable factors of drying operation is avoided;
3) the tail gas condensation cooling process is a temperature reduction and dehumidification process, and the humidity of the drying medium can be automatically adjusted by controlling the temperature of the circulating gas;
4) the process is simple and easy to implement, is suitable for the transformation of the existing equipment (only a tail gas condensation cooler and a corresponding pipeline are needed to be added), and is also suitable for new projects.
Drawings
Fig. 1 is a schematic structural diagram of a system for drying ammonium sulfate by closed gas circulation according to the present invention.
In the figure: 1. vibrated fluidized bed 2, ammonium sulfate storage hopper 3, cyclone separator 4, tail gas fan 5, tail gas condensation cooler 6, temperature measuring device 7, inlet electric regulating valve 8, liquid level measuring device 9, outlet electric regulating valve 10, gas heater
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
as shown in figure 1, a system for drying ammonium sulfate by closed gas circulation for realizing the method comprises a vibrating fluidized bed 1, a gas heater 10, an ammonium sulfate storage hopper 2, a cyclone separator 3 and a tail gas fan 4; the tail gas condensation cooler 5 is also included; the vibrating fluidized bed 1 is connected with an air inlet of the cyclone separator 3 through a tail gas output pipeline, a finished ammonium sulfate outlet of the vibrating fluidized bed 1 and an ammonium sulfate dust outlet at the bottom of the cyclone separator 3 are respectively connected with an ammonium sulfate storage hopper 2, a tail gas outlet at the top of the cyclone separator 3 is connected with a gas inlet of a tail gas condensation cooler 5 through a tail gas conveying pipeline, and a tail gas fan 4 is arranged on the tail gas conveying pipeline; the tail gas condensing cooler 5 is provided with a condensate outlet and a low-temperature dry gas outlet, the low-temperature dry gas outlet is respectively connected with a dry section gas inlet and a cooling section gas inlet of the vibrated fluidized bed 1 through a circulating gas pipeline, and a gas heater 10 is arranged on a branch of the circulating gas pipeline connected with the dry section gas inlet.
The circulating gas pipeline is provided with a temperature measuring device 6 at one end close to the tail gas condensation cooler 5, an inlet electric regulating valve 7 is arranged on a cooling medium inlet pipeline of the tail gas condensation cooler 5, and the inlet electric regulating valve 7 and the temperature measuring device 6 are controlled in an interlocking mode through a control system.
The lower part of the tail gas condensation cooler 5 is provided with a liquid level measuring device 8, a condensate outlet pipeline of the tail gas condensation cooler 5 is provided with an outlet electric regulating valve 9, and the outlet electric regulating valve 9 and the liquid level measuring device 8 are controlled in an interlocking mode through a control system.
The tail gas condensation cooler 5 is a dividing wall type cooler.
The working principle of the system for drying ammonium sulfate by gas closed cycle is that the tail gas after drying ammonium sulfate is cooled and dehumidified and then is used as the gas medium of drying ammonium sulfate for cycle. The method comprises the following steps: the tail gas generated after the ammonium sulfate is dried by the vibrated fluidized bed 1 is dedusted by the cyclone separator 3, and is cooled and dehumidified by the tail gas condensation cooler 5, one part of the tail gas is heated by the gas heater 10 and then enters the drying section of the vibrated fluidized bed 1, the other part of the tail gas directly enters the cooling section of the vibrated fluidized bed 1, the gas in the system is circulated in a closed loop, and no tail gas is discharged.
As shown in fig. 1, ammonium sulfate (with a water content of about 2%) which is mechanically dehumidified by a centrifuge enters a vibrated fluidized bed 1, is dehumidified by hot circulating gas in a drying section (primary drying and secondary drying), is cooled by cold circulating gas in a cooling section to obtain a dried ammonium sulfate product, and is collected in an ammonium sulfate storage hopper 2. The drying section of the vibrated fluidized bed 1, the dry tail gas discharged from the cooling section is firstly separated from ammonium sulfate dust by the cyclone separator 3, then the dry tail gas is pressurized by the tail gas fan 4 and enters the tail gas condensation cooler 5, a cooling medium is introduced into the tail gas condensation cooler 5 to cool and dehumidify the tail gas, the tail gas dried at low temperature is used as a part of circulating gas and enters the drying section of the vibrated fluidized bed 1 after being heated by the gas heater 10, the other part of the circulating gas directly enters the cooling section of the vibrated fluidized bed 1, the circulation is carried out, and the zero emission of the tail gas after the ammonium sulfate is dried is realized.
The condensed gas phase temperature is controlled by interlocking of the temperature measuring device 6 and the inlet electric regulating valve 7. The liquid level measuring device 8 and the outlet electric regulating valve 9 are interlocked to control the discharge of condensate in the tail gas condensation cooler 5, so that the tail gas is prevented from escaping.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (4)
1. A system for drying ammonium sulfate by closed gas circulation comprises a vibrating fluidized bed, a gas heater, an ammonium sulfate storage hopper, a cyclone separator and a tail gas fan; it is characterized by also comprising a tail gas condensation cooler; the vibrating fluidized bed is connected with an air inlet of the cyclone separator through a tail gas output pipeline, a finished ammonium sulfate outlet of the vibrating fluidized bed and an ammonium sulfate dust outlet at the bottom of the cyclone separator are respectively connected with an ammonium sulfate storage hopper, a tail gas outlet at the top of the cyclone separator is connected with a gas inlet of a tail gas condensation cooler through a tail gas conveying pipeline, and a tail gas fan is arranged on the tail gas conveying pipeline; the tail gas condensing cooler is provided with a condensate outlet and a low-temperature dry gas outlet, the low-temperature dry gas outlet is respectively connected with a dry section gas inlet and a cooling section gas inlet of the vibrated fluidized bed through a circulating gas pipeline, and a gas heater is arranged on a branch of the circulating gas pipeline connected with the dry section gas inlet.
2. The system for drying ammonium sulfate by closed gas circulation as claimed in claim 1, wherein the circulating gas pipeline is provided with a temperature measuring device at one end close to the tail gas condensation cooler, an inlet electric regulating valve is arranged on a cooling medium inlet pipeline of the tail gas condensation cooler, and the inlet electric regulating valve and the temperature measuring device are controlled in an interlocking manner by a control system.
3. The system for drying ammonium sulfate by closed gas circulation as claimed in claim 1, wherein a liquid level measuring device is arranged at the lower part of the tail gas condensation cooler, an outlet electric regulating valve is arranged on a condensate outlet pipeline of the tail gas condensation cooler, and the outlet electric regulating valve and the liquid level measuring device are controlled in an interlocking manner by a control system.
4. A system for drying ammonium sulphate in a closed gas loop according to claim 1, 2 or 3 characterised in that the off-gas condensate cooler is a dividing wall cooler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920622162.7U CN210197871U (en) | 2019-04-30 | 2019-04-30 | System for drying ammonium sulfate by gas closed cycle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920622162.7U CN210197871U (en) | 2019-04-30 | 2019-04-30 | System for drying ammonium sulfate by gas closed cycle |
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| CN210197871U true CN210197871U (en) | 2020-03-27 |
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| CN201920622162.7U Active CN210197871U (en) | 2019-04-30 | 2019-04-30 | System for drying ammonium sulfate by gas closed cycle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110017666A (en) * | 2019-04-30 | 2019-07-16 | 中冶焦耐(大连)工程技术有限公司 | A kind of method and system of the dry sulphur ammonium of gas closed-circulation |
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2019
- 2019-04-30 CN CN201920622162.7U patent/CN210197871U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110017666A (en) * | 2019-04-30 | 2019-07-16 | 中冶焦耐(大连)工程技术有限公司 | A kind of method and system of the dry sulphur ammonium of gas closed-circulation |
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