CN218434922U - System for producing concentrated ammonia water from ammonia-containing tail gas produced by harmless treatment of aluminum ash - Google Patents
System for producing concentrated ammonia water from ammonia-containing tail gas produced by harmless treatment of aluminum ash Download PDFInfo
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- CN218434922U CN218434922U CN202222374856.8U CN202222374856U CN218434922U CN 218434922 U CN218434922 U CN 218434922U CN 202222374856 U CN202222374856 U CN 202222374856U CN 218434922 U CN218434922 U CN 218434922U
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Abstract
The utility model discloses a system for aluminium ash innocent treatment institute produces ammonia tail gas production strong ammonia water, including aluminium ash feeding device, hydrolysis reactor, divide the ware, the condenser, the aqueous ammonia buffer tank, the ejector, the circulating pump, the circulating tank, the draught fan, it produces ammonia gas production strong ammonia water process principle according to aluminium ash innocent treatment process, the strong ammonia water preparation system of one-step method of reaction characteristic, it has been solved by aluminium ash and has been contained the problem that ammonia tail gas production aqueous ammonia concentration is low in the innocent treatment process of wet process, not only process flow is short, equipment investment is few, and the aqueous ammonia concentration of producing can be stabilized more than 20%, it can reach the mark and discharge to handle back tail gas.
Description
Technical Field
The utility model relates to an aluminium ash innocent treatment, concretely relates to aluminium ash innocent treatment institute produces system that contains ammonia tail gas production strong ammonia water.
Background
The aluminum ash is an industrial waste generated in the aluminum electrolysis and aluminum product processing process and is divided into primary aluminum ash and secondary aluminum ash. The main chemical components are alumina, metallic aluminum and aluminum nitride, and also contain a small amount of silicon, magnesium, calcium, iron, chloride, fluoride and the like.
The aluminum nitride contained in the aluminum ash can generate hydrolysis reaction when contacting with humid air or water to generate aluminum hydroxide and ammonia, and the release of ammonia gas can cause serious pollution to the atmospheric environment, so that the aluminum ash has obvious reactivity. Fluoride contained in the aluminum ash is a toxic and harmful substance, can cause pollution to water and soil when dissolved in water, seriously harms the safety of residents and livestock in a polluted area, and has leaching toxicity of inorganic fluoride.
Because the aluminum ash contains toxic and harmful substances such as aluminum nitride, fluoride, chloride, soluble salt and the like, the aluminum ash has leaching toxicity (T) and reactivity (R) and obvious dangerous characteristics. Therefore, the national hazardous waste directory (2016) lists the primary aluminum ash in the hazardous waste directory, and 2019 lists the secondary aluminum ash in the hazardous waste directory.
At present, the hydrolysis process of the aluminum ash denitrification technology well known in the industry mixes the aluminum ash with water, controls the process conditions to carry out hydrolysis reaction, and converts aluminum nitride, metallic aluminum and aluminum carbide in the aluminum ash into aluminum hydroxide, ammonia gas, hydrogen gas and methane respectively. The reaction tail gas is introduced into an ammonia water recovery system, and is condensed and absorbed to prepare dilute ammonia water, the concentration of the obtained ammonia water is lower and is below 7.5 percent, which is far below the standard (20 percent) of HG/T5353-2018 industrial ammonia water, the ammonia water has no commercial value, and can only be regarded as new industrial waste and has the dangerous characteristic.
Disclosure of Invention
To the present situation that the ammonia tail gas that contains is difficult to produce high concentration aqueous ammonia that is produced by the innoxious processing of aluminium ash at present, the utility model aims to solve the technical problem that a system that the innoxious processing of aluminium ash produced contains ammonia tail gas production strong aqueous ammonia is provided, this reaction system is suitable for the innoxious processing of wet process of aluminium ash and directly produces high aqueous ammonia, has advantages such as equipment is simple, the flow is short, aqueous ammonia concentration is high, the energy consumption is low.
In order to solve the technical problem, the utility model discloses the technical scheme who takes is: a system for producing concentrated ammonia water from ammonia-containing tail gas generated by harmless treatment of aluminum ash comprises an aluminum ash feeding device, a hydrolysis reactor, a splitter, a condenser, an ammonia water buffer tank, an ejector, a circulating pump, a circulating tank and an induced draft fan, wherein a discharge port of the aluminum ash feeding device is connected with a feed port of the hydrolysis reactor through a valve, a tail gas outlet of the hydrolysis reactor is connected with a gas inlet at the bottom of the splitter through an exhaust pipe, a condensed water outlet at the bottom of the splitter is connected with a condensed water inlet of the hydrolysis reactor through a pipeline, a gas outlet at the top of the splitter is connected with a gas inlet of the condenser through a pipeline, a condensed liquid outlet at the bottom of the tail end of the condenser is connected with the ammonia water buffer tank through a pipeline, and an outlet at the bottom of the ammonia water buffer tank is connected with the splitter and a finished product ammonia water storage tank through a pipeline; a gas inlet through pipeline of the ejector is connected with a tail gas exhaust port of the condenser, a liquid outlet of the ejector is connected with a liquid inlet at the top of the circulating tank through a normal connection, a liquid outlet at the bottom of the circulating tank is connected with a liquid inlet of the circulating pump through a pipeline, and a liquid outlet at the bottom of the circulating tank is connected with an ammonium salt solution feed inlet of the hydrolysis reactor through a pipeline; the liquid outlet of the circulating pump is connected with a liquid inlet opening and closing pipeline of the ejector, and the tail gas outlet of the circulating tank is connected with the draught fan through a pipeline.
The hydrolysis reactor is provided with an online temperature measurement and control system, and a gas pipeline connecting a gas outlet of the hydrolysis reactor and a gas inlet at the bottom of the splitter is provided with an online temperature measurement and control system, an online ammonia concentration measurement and control system and an online hydrogen concentration measurement and control system; the top of the splitter is provided with an online temperature measurement and control system, an online ammonia concentration measurement and control system and an online hydrogen concentration measurement and control system; the gas inlet and the tail gas outlet of the condenser are respectively provided with a temperature online measurement and control system; and an ammonia water concentration online measurement and control system is arranged on the ammonia water buffer tank.
An ammonia water flow online control system is arranged on a pipeline connected with the condenser and the ammonia water buffer tank, and an ammonia water return pipeline connected with the splitter and a finished product ammonia water pipeline connected with the finished product ammonia water storage tank are provided with the ammonia water flow online control system; the ammonia water flow online control system is interlocked with the regulating valve.
The aluminum ash feeding device is a screw feeder with metering function and controllable conveying capacity.
The hydrolysis reactor is a kettle type reactor.
The splitter is a packed tower, and a tube cooler is arranged at the top of the tower.
The utility model adopts the above technical scheme design aluminium ash innocent treatment produced contains the system of ammonia tail gas production strong ammonia water, according to the aluminium ash innocent treatment process produced contains the strong ammonia water process principle of ammonia gas production, the one-step method strong ammonia water preparation system of reaction characteristic and development, solved by the problem that the aluminium ash contains ammonia tail gas production ammonia water low concentration in the process of wet process innocent treatment, not only the process flow is short, the equipment investment is few, and the ammonia water concentration of producing can be stabilized more than 20%, it can mark the emission to handle back tail gas. The utility model has the advantages of simple equipment, short flow, high ammonia water concentration, low energy consumption and the like.
Drawings
Fig. 1 shows a schematic structural view of the present invention.
Detailed Description
The system for producing concentrated ammonia water from ammonia-containing tail gas produced by the harmless treatment of aluminum ash according to the present invention will be specifically described with reference to the accompanying drawings.
The utility model discloses the harmless system of disposing of institute's produced ammonia tail gas production strong aqueous ammonia of aluminium ash, see figure 1, including aluminium ash feeding device 1, hydrolysis reactor 2, division ware 3, condenser 4, aqueous ammonia buffer tank 5, ejector 6, circulating pump 7, circulation tank 8, draught fan 9. The aluminum ash feeding device 1 is a screw feeder with metering function and controllable conveying capacity, and a discharge port of the screw feeder is connected with a feed port of the hydrolysis reactor 2 through a valve. The hydrolysis reactor 2 is a kettle type reactor, and a tail gas outlet of the hydrolysis reactor 2 is connected with a gas inlet at the bottom of the splitter 3 through an exhaust pipe. The bottom of the divider 3 is provided with a condensed water discharge port which is connected with a condensed water inlet of the hydrolysis reactor 2 through a pipeline, the divider 3 is a packed tower, the top of the tower is provided with a tubular cooler, and a gas outlet at the top of the divider 3 is connected with a gas inlet of the condenser 4 through a pipeline. A condensate (ammonia water) outlet at the bottom of the tail end of the condenser 4 is connected with an ammonia water buffer tank 5 through a pipeline; an outlet at the bottom of the ammonia buffer tank 5 is connected with the splitter 3 and a finished product ammonia storage tank through a pipeline; a gas inlet passage pipeline of the jet device 6 is connected with a tail gas outlet of the condenser 4; the liquid outlet of the ejector 6 is connected with the liquid inlet at the top of the circulating groove 8 through a normal connection; a liquid outlet at the bottom of the circulating tank 8 is connected with a liquid inlet of the circulating pump 7 through a pipeline; a liquid outlet at the bottom of the circulating tank 8 is connected with an ammonium salt solution feed inlet of the hydrolysis reactor 2 through a pipeline; the liquid outlet of the circulating pump 7 is connected with a liquid inlet communicating pipe of the ejector 6; the tail gas outlet of the circulation groove 8 is connected with a draught fan 9 through a pipeline.
The utility model discloses still install the online system of observing and controling of temperature at hydrolysis reactor 2, install the online system of observing and controling of temperature, online system of observing and controling of ammonia concentration and the online system of observing and controling of hydrogen concentration on the gas pipeline that 2 gas discharge ports of hydrolysis reactor and 3 bottom gas inlets of division ware are connected. The top of the splitter 3 is provided with an online temperature measurement and control system, an online ammonia concentration measurement and control system and an online hydrogen concentration measurement and control system. And a gas inlet and a tail gas outlet of the condenser 4 are respectively provided with a temperature online measurement and control system. An ammonia water concentration online measurement and control system is arranged on the ammonia water buffer tank 5. An ammonia water flow online control system is arranged on a pipeline connected with the condenser 4 and the ammonia water buffer tank 5. An ammonia water flow online control system is arranged on an ammonia water return pipeline connected with the ammonia water buffer tank 5 and the splitter 3 and a finished product ammonia water pipeline connected with the finished product ammonia water storage tank. The ammonia water flow online control system is interlocked with the regulating valve.
The utility model discloses a working process does:
water or ammonium salt solution or denitrogenation mother liquor is added into a hydrolysis reactor 2 in sequence and quantitatively, aluminum ash enters the hydrolysis reactor 2 through an aluminum ash feeding device 1 and then is mixed with water, the contained aluminum nitride, metallic aluminum and aluminum carbide are subjected to hydrolysis reaction with the water to generate mixed gas of ammonia gas, hydrogen gas, methane and water vapor, a circulating pump 7 and an induced draft fan 9 are synchronously started, a jet device 6 is utilized to generate micro negative pressure, the mixed gas enters the bottom of a divider 3 through a tail gas discharge port of the hydrolysis reactor 2 under the action of the micro negative pressure, the mixed gas entering the bottom of the divider 3 ascends through a packing layer in the divider 3 according to a specific flow rate under the action of the micro negative pressure, the mixed gas contacts with the packing material in the ascending process and generates a mass transfer effect, water molecules are aggregated into liquid drops, the mixed gas descends along with the packing layer, unadsorbed ammonia continues to ascend, and a small amount of ammonia adsorbed in the descending process of the liquid drops is volatilized again to ascend along with the rise of temperature. The ammonia-containing gas goes upward and goes out of the condensation separator 3 after passing through the top tube still cooler, the ammonia concentration of the ammonia-containing gas going out of the condensation separator 3 for separating most of water vapor is 17-25% of ammonia vapor, so that the separation of water and ammonia in the mixed gas is realized, the ammonia concentration in the gas going out of the condensation separator 3 is improved, and a foundation is laid for recovering concentrated ammonia water. The ammonia-containing gas entering the condenser 4 is condensed and converted into concentrated ammonia water with the concentration of 18-25%, and the concentrated ammonia water is discharged from a condensate liquid (ammonia water) outlet at the bottom of the tail end of the condenser 4 and enters an ammonia water buffer tank 5. The ammonia water is discharged from the bottom of the ammonia water buffer tank 5, part of the ammonia water returns to the splitter 3 through a pipeline, and part of the ammonia water enters the finished product ammonia water storage tank.
The utility model discloses 4 condensation of condenser are tail gas after absorbing still contain micro-ammonia, get into ejector 6 through the pipeline under the effect of little negative pressure, mix, react with the acid solution in the circulating groove 8 in ejector 6, generate ammonium salt, and tail gas discharge to reach standard after handling. The generated ammonium salt solution is sent into the hydrolysis reactor 2 for batching at regular time and quantity through a pipeline. The ammonium salt reacts with the added calcium in the hydrolysis reactor to form ammonia and calcium salt.
Claims (6)
1. A system for producing concentrated ammonia water from ammonia-containing tail gas generated by harmless treatment of aluminum ash comprises an aluminum ash feeding device, a hydrolysis reactor, a splitter, a condenser, an ammonia water buffer tank, an ejector, a circulating pump, a circulating tank and an induced draft fan, and is characterized in that a discharge port of the aluminum ash feeding device is connected with a feed port of the hydrolysis reactor through a valve, a tail gas outlet of the hydrolysis reactor is connected with a gas inlet at the bottom of the splitter through an exhaust pipe, a condensed water outlet at the bottom of the splitter is connected with a condensed water inlet of the hydrolysis reactor through a pipeline, a gas outlet at the top of the splitter is connected with a gas inlet of the condenser through a pipeline, a condensed liquid outlet at the bottom of the tail end of the condenser is connected with the ammonia water buffer tank through a pipeline, and an outlet at the bottom of the ammonia water buffer tank is connected with the splitter and a finished product ammonia water storage tank through a pipeline; a gas inlet through pipeline of the ejector is connected with a tail gas exhaust port of the condenser, a liquid outlet of the ejector is connected with a liquid inlet at the top of the circulating tank through a normal connection, a liquid outlet at the bottom of the circulating tank is connected with a liquid inlet of the circulating pump through a pipeline, and a liquid outlet at the bottom of the circulating tank is connected with an ammonium salt solution feed inlet of the hydrolysis reactor through a pipeline; the liquid outlet of the circulating pump is connected with a liquid inlet opening and closing pipeline of the ejector, and the tail gas outlet of the circulating tank is connected with the draught fan through a pipeline.
2. The system for producing concentrated ammonia water from ammonia-containing tail gas generated by harmless treatment of aluminum ash as claimed in claim 1, wherein the hydrolysis reactor is provided with an online temperature measurement and control system, and a gas pipeline connecting a gas outlet of the hydrolysis reactor and a gas inlet at the bottom of the splitter is provided with an online temperature measurement and control system, an online ammonia concentration measurement and control system and an online hydrogen concentration measurement and control system; the top of the splitter is provided with an online temperature measurement and control system, an online ammonia concentration measurement and control system and an online hydrogen concentration measurement and control system; the gas inlet and the tail gas outlet of the condenser are respectively provided with a temperature online measurement and control system; and an ammonia water concentration online measurement and control system is arranged on the ammonia water buffer tank.
3. The system for producing strong ammonia water by the harmless treatment of the aluminum ash from the produced ammonia-containing tail gas according to claim 1, wherein an ammonia water flow online control system is installed on a pipeline connecting the condenser and an ammonia water buffer tank, and an ammonia water flow online control system is installed on an ammonia water return pipeline connecting the ammonia water buffer tank with the splitter and a finished ammonia water pipeline connecting with a finished ammonia water storage tank; the ammonia water flow online control system is interlocked with the regulating valve.
4. The system for producing the concentrated ammonia water from the ammonia-containing tail gas generated by the harmless treatment of the aluminum ash according to claim 1, which is characterized in that the aluminum ash feeding device is a screw feeder with metering function and controllable conveying capacity.
5. The system for producing strong ammonia water by harmlessly treating the ammonia-containing tail gas generated by using the aluminum ash according to claim 1, wherein the hydrolysis reactor is a tank reactor.
6. The system for producing strong ammonia water by the harmless treatment of the aluminum ash from the produced ammonia-containing tail gas according to claim 1, wherein the condensation separator is a packed tower, and a tube-array cooler is arranged at the top of the tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222374856.8U CN218434922U (en) | 2022-09-07 | 2022-09-07 | System for producing concentrated ammonia water from ammonia-containing tail gas produced by harmless treatment of aluminum ash |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222374856.8U CN218434922U (en) | 2022-09-07 | 2022-09-07 | System for producing concentrated ammonia water from ammonia-containing tail gas produced by harmless treatment of aluminum ash |
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| Publication Number | Publication Date |
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| CN218434922U true CN218434922U (en) | 2023-02-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222374856.8U Active CN218434922U (en) | 2022-09-07 | 2022-09-07 | System for producing concentrated ammonia water from ammonia-containing tail gas produced by harmless treatment of aluminum ash |
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| CN (1) | CN218434922U (en) |
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- 2022-09-07 CN CN202222374856.8U patent/CN218434922U/en active Active
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