CN115650347A - System for utilize membrane contactor production pure concentrated ammonium sulfate - Google Patents
System for utilize membrane contactor production pure concentrated ammonium sulfate Download PDFInfo
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- CN115650347A CN115650347A CN202211371652.7A CN202211371652A CN115650347A CN 115650347 A CN115650347 A CN 115650347A CN 202211371652 A CN202211371652 A CN 202211371652A CN 115650347 A CN115650347 A CN 115650347A
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Abstract
The invention discloses a system for producing pure concentrated ammonium sulfate by using a membrane contactor, which comprises a degassing unit and an absorption unit; the degassing unit comprises a degassing membrane contactor, an ammonia nitrogen wastewater inlet passage connected with a wastewater inlet of the degassing membrane contactor, and a gas extraction pipeline connected with a gas phase outlet of the degassing membrane contactor; the ammonia nitrogen wastewater inlet path is connected with an ammonia nitrogen wastewater tank; the absorption unit comprises an absorption membrane contactor, a waste sulfuric acid inlet path connected with a waste acid inlet of the absorption membrane contactor, and an ammonium sulfate output pipeline connected with an output port of the absorption membrane contactor; the waste sulfuric acid inlet path is connected with a sulfuric acid circulating box; the air suction pipeline is connected with an ammonia gas inlet of the absorption membrane contactor; and the ammonium sulfate output pipeline of the absorption membrane contactor outputs ammonium sulfate. The system is simple and reliable, is convenient to operate, can treat waste sulfuric acid and ammonia nitrogen wastewater to generate available pure ammonium sulfate, cannot cause secondary pollution, is high in concentration rate and wastewater recycling rate, and has wide application prospect.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a system for producing pure concentrated ammonium sulfate by utilizing a membrane contactor based on ammonia nitrogen wastewater and waste sulfuric acid recovery.
Background
Ammonium sulfate is an inorganic substance, can be used as a fertilizer, is an excellent nitrogen fertilizer, is suitable for various soils and crops, and can be used in the fields of textile, leather, medicine and the like. Ammonium sulfate has many biological uses, and is often used in protein purification processes; because the ammonium sulfate belongs to inert substances and is not easy to react with other bioactive substances, the activity of the protein can be protected to the maximum extent in the purification process; in addition, the ammonium sulfate has excellent solubility, can form a high-salt environment, and can prepare for protein precipitation and subsequent high-salt purification.
In the production method of ammonium sulfate, one of the production methods is to directly perform neutralization reaction on ammonia and sulfuric acid to obtain ammonium sulfate; the method has fewer applications, mainly comprising the following steps: the by-products or the exhaust gas from industrial production are absorbed by sulfuric acid or ammonia water (e.g. sulfuric acid absorbs ammonia from coke oven gas, ammonia water absorbs sulfur dioxide from flue gas from smeltery, ammonia from kaplan production or sulfuric acid waste liquid from titanium dioxide production by sulfuric acid process). The other method is a gypsum method, which mainly uses natural gypsum or phosphogypsum, ammonia and carbon dioxide as raw materials to produce ammonium sulfate. The traditional tail gas recovery method has the following problems: the spray tower is isometric big, and the operation degree of difficulty is big, and dangerous high, the investment is high, and is efficient limited, can cause the waste of ammonia, and inside ammonia concentration too high can bring the harm to the operator's health simultaneously.
The concentrated ammonium sulfate production generally adopts an evaporation concentration method, conditions such as pH value, temperature, concentration and the like can influence the concentration rate of the ammonium sulfate, and the problems of waste of ammonia evaporation, high energy consumption and the like exist; moreover, evaporative concentration crystallization is generally only suitable for wastewater with high ammonia nitrogen concentration, and the concentration rate is limited.
Adopt membrane contactor can effectively improve the concentrated multiplying power of ammonium sulfate at present stage, but membrane contactor can be because of life and structural reason after long-term the use, thereby lead to the surperficial surface hydrophobicity of membrane silk to disappear gradually and let ammonia nitrogen waste water enter into concentrated ammonium sulfate a small amount, if there is different ion in the waste water, can cause concentrated ammonium sulfate to be polluted, and purity reduces, brings negative effects to the retrieval and utilization of ammonia nitrogen.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a system for producing pure concentrated ammonium sulfate by using a membrane contactor; the system is simple and reliable, is convenient to operate, can treat waste sulfuric acid and ammonia nitrogen wastewater to generate available pure ammonium sulfate, cannot cause secondary pollution, is high in concentration rate and wastewater recycling rate, and has wide application prospect.
In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:
a system for producing pure concentrated ammonium sulfate by using a membrane contactor comprises a degassing unit for removing ammonia gas from ammonia nitrogen wastewater and an absorption unit for absorbing the ammonia gas;
the degassing unit comprises a degassing membrane contactor, an ammonia nitrogen wastewater inlet passage connected with a wastewater inlet of the degassing membrane contactor, and an air pumping pipeline connected with a gas phase outlet of the degassing membrane contactor; the ammonia nitrogen wastewater inlet path is connected with an ammonia nitrogen wastewater tank;
the absorption unit comprises an absorption membrane contactor, a waste sulfuric acid inlet path connected with a waste acid inlet of the absorption membrane contactor, and an ammonium sulfate output pipeline connected with an output port of the absorption membrane contactor; the waste sulfuric acid inlet path is connected with a sulfuric acid circulating box;
the gas extraction pipeline of the degassing unit is connected with the ammonia gas inlet of the absorption membrane contactor of the absorption unit; and an ammonium sulfate output pipeline of the absorption membrane contactor outputs waste sulfuric acid to absorb ammonium sulfate generated by ammonia gas.
Further, a vacuum pump and a gas-liquid separator are arranged on the air extraction pipeline; the gas-liquid separator can separate the gas-liquid mixed fluid at the outlet of the vacuum pump, so that the gas outlet of the gas-liquid separator outputs pure ammonia gas.
Further, a gas phase outlet of the degassing membrane contactor is connected with a leakage return pipeline, and a leakage return buffer tank, a leakage return buffer valve, a leakage return tank and a leakage return valve are arranged on the leakage return pipeline; the leakage return pipeline is connected with the ammonia nitrogen wastewater tank.
Further, the degassing membrane contactor is also provided with a water producing port, and the water producing port is connected with an ammonia nitrogen removal water producing pipeline.
Furthermore, an ammonia nitrogen wastewater circulating pipeline is connected to a water production port of the degassing membrane contactor; an ammonia nitrogen wastewater circulating valve and an ammonia nitrogen wastewater one-way valve are arranged on the ammonia nitrogen wastewater circulating pipeline; the ammonia nitrogen wastewater circulating pipeline is connected with the ammonia nitrogen wastewater tank.
Further, an output port of the absorption membrane contactor is also connected with a waste sulfuric acid circulating pipeline; the waste sulfuric acid circulating pipeline is provided with a waste sulfuric acid circulating valve and a waste sulfuric acid one-way valve; the waste sulfuric acid circulating pipeline is connected with the sulfuric acid circulating box.
Further, a gas-phase outlet of the absorption membrane contactor is connected with an ammonia loop, and a gas delivery pump is arranged on the ammonia loop; and the ammonia loop is connected with the air inlet of the degassing membrane contactor. Excess ammonia gas flowing out through the gas phase outlet of the absorption membrane contactor may be passed into the degassing membrane contactor as a sweep gas for gas sweeping to improve the efficiency of the degassing membrane contactor.
Further, an ammonia nitrogen wastewater inlet valve, an ammonia nitrogen wastewater pump, an ammonia nitrogen wastewater flow regulating valve, an ammonia nitrogen wastewater security filter, an ammonia nitrogen wastewater flow meter and a liquid phase maintenance valve are arranged on the ammonia nitrogen wastewater inlet path; and the waste sulfuric acid inlet path is provided with an acid inlet valve, an acid circulating pump, an acid flow regulating valve, an acid security filter and an acid flow meter.
Furthermore, the vacuum pump is also connected with a first cooling circulation pipeline, the first cooling circulation pipeline is connected with the waste sulfuric acid inlet passage, and the waste sulfuric acid can be used as a cooling medium to cool the vacuum pump.
Furthermore, a heat exchanger is further arranged on the waste sulfuric acid circulating pipeline, and the heat exchanger is further connected with a cooling circulating pipeline II, so that liquid in the waste sulfuric acid circulating pipeline can be cooled.
Furthermore, the water production port of the degassing membrane contactor and the water production port of the absorption membrane contactor are connected with online ammonia nitrogen concentration sensors.
The invention has the beneficial effects that:
the system adopts a degassing membrane contactor to treat ammonia nitrogen wastewater, and a gas-liquid separator is used for separation to obtain pure ammonia gas; and the absorption membrane contactor is adopted to treat the waste sulfuric acid, so that the waste sulfuric acid can react with ammonia gas provided by the degassing membrane contactor to generate pure ammonium sulfate.
In a degassing unit, a gas phase outlet of a degassing membrane contactor of the system is provided with a leakage backflow buffer tank and a leakage backflow tank, so that leaked ammonia nitrogen wastewater flows into the leakage backflow buffer tank and the leakage backflow tank under the action of gravity and then flows back into an ammonia nitrogen wastewater tank, the leakage of the ammonia nitrogen wastewater is avoided to the maximum extent, the generation of byproducts is reduced, and the purity of a final ammonium sulfate product is improved;
in the absorption unit, the waste sulfuric acid side of the absorption membrane contactor can continuously absorb pure ammonia gas to generate pure ammonium sulfate.
The system provided by the invention utilizes the two membrane contactors to treat the ammonia nitrogen wastewater and the waste sulfuric acid, so that the treatment efficiency and treatment effect of the ammonia nitrogen wastewater and the waste sulfuric acid can be improved, and relatively pure ammonium sulfate can be obtained.
By utilizing the system, the waste sulfuric acid and the ammonia nitrogen wastewater can be recycled, the discharge of the sulfuric acid wastewater and the ammonia nitrogen wastewater can be effectively reduced, and the influence on the environment is reduced.
This system can be safe quick carry out simultaneous processing and recycle to waste sulfuric acid and ammonia nitrogen waste water, generates pure concentrated ammonium sulfate, greatly reduced ammonium sulfate manufacturing cost, improve production efficiency, reduce the operation degree of difficulty and condition, reduce the emission of sulphuric acid and ammonia nitrogen by a wide margin, no secondary pollutant, reducible harm to the environment.
The system of the invention has the advantages of simple operation, safety, reliability, convenient maintenance, long service life, lower operation cost, higher economic benefit and wide application prospect.
Drawings
FIG. 1 is a schematic diagram of a system for producing pure concentrated ammonium sulfate using a membrane contactor according to the present invention.
In the figure, 101: a degassing membrane contactor; 102: an ammonia nitrogen wastewater inlet path; 103: an air extraction pipeline; 104: an ammonia nitrogen wastewater tank; 105: an ammonia nitrogen wastewater inlet valve; 106: ammonia nitrogen wastewater pump; 107: ammonia nitrogen wastewater flow regulating valve; 108: ammonia nitrogen wastewater security filter; 109: an ammonia nitrogen wastewater flowmeter; 110: a liquid phase service valve; 111: a vacuum pump; 112: a gas-liquid separator; 113: a vacuum degree regulating valve; 114: an ammonia gas quantity regulating valve; 115: an ammonia gas flow meter; 116: a needle valve; 117: separating the return line; 118: separating and refluxing the buffer tank; 119: separating a backflow buffer valve; 120: separating the reflux tank; 121: a separation reflux valve; 122: a leaky return line; 123: a leakage backflow buffer tank; 124: a seepage backflow buffer valve; 125: a seepage backflow tank; 126: a seepage backflow valve; 127: an ammonia nitrogen water removal output pipeline; 128: a water production valve; 129: an ammonia nitrogen wastewater circulating pipeline; 130: circulating a valve for ammonia nitrogen wastewater; 131; an ammonia nitrogen wastewater one-way valve; 132: an air make-up line; 133: an air intake valve; 134: an air volume adjusting valve; 135: an ammonia nitrogen wastewater supply valve; 136: an ammonia nitrogen wastewater supply pipeline;
201: an absorbent membrane contactor; 202: a waste sulfuric acid inlet path; 203: an ammonium sulfate output pipeline; 204: a sulfuric acid circulation tank; 205: an acid inlet valve; 206: an acid circulation pump; 207: an acid flow regulating valve; 208: an acid cartridge filter; 209: an acid flow meter; 210: a spent sulfuric acid recycle line; 211: a waste sulfuric acid circulating valve; 212: a waste sulfuric acid check valve; 213: a product valve; 214: an ammonia gas loop; 215: a gas delivery pump; 216: a purge gas amount adjusting valve; 217: a purge gas flow meter; 218: a heat exchanger; 219: a sulfuric acid supply valve; 220: a sulfuric acid supply line;
301: a cooling circulation pipeline I; 302: and a second cooling circulation pipeline.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings so that the advantages and features of the present invention will be readily understood by those skilled in the art, and the scope of the present invention will be clearly and clearly defined.
A system for producing pure concentrated ammonium sulfate by using a membrane contactor as shown in fig. 1, which comprises a degassing unit for removing ammonia gas from ammonia nitrogen wastewater and an absorption unit for absorbing ammonia gas;
the degassing unit comprises a degassing membrane contactor 101, an ammonia nitrogen wastewater inlet path 102 connected with a wastewater inlet of the degassing membrane contactor 101, and a gas extraction pipeline 103 connected with a gas phase outlet of the degassing membrane contactor 101; the ammonia nitrogen wastewater inlet path 102 is connected with an ammonia nitrogen wastewater tank 104;
the absorption unit comprises an absorption membrane contactor 201, a waste sulfuric acid inlet 202 connected with a waste acid inlet of the absorption membrane contactor 201, and an ammonium sulfate output pipeline 203 connected with an output port of the absorption membrane contactor 201; the waste sulfuric acid inlet 202 is connected with a sulfuric acid circulating box 204;
the extraction pipeline 103 of the degassing unit is connected with the ammonia gas inlet of the absorption membrane contactor 201 of the absorption unit; the ammonium sulfate output pipeline 203 of the absorption membrane contactor 201 outputs waste sulfuric acid to absorb ammonium sulfate generated by ammonia gas.
An ammonia nitrogen wastewater inlet valve 105, an ammonia nitrogen wastewater pump 106, an ammonia nitrogen wastewater flow regulating valve 107, an ammonia nitrogen wastewater security filter 108, an ammonia nitrogen wastewater flow meter 109 and a liquid phase maintenance valve 110 are arranged on an ammonia nitrogen wastewater inlet path 102 in the degassing unit.
The extraction line 103 is connected to the ammonia gas inlet of the absorption membrane contactor 201 of the absorption unit. The extraction pipeline 103 is provided with a vacuum pump 111 and a gas-liquid separator 112; the gas-liquid separator 112 can separate ammonia gas from liquid (sulfuric acid wastewater), so that a gas outlet of the gas-liquid separator 112 outputs pure ammonia gas. In addition, the extraction pipeline 103 is also provided with a vacuum degree regulating valve 113, an ammonia gas amount regulating valve 114, an ammonia gas flowmeter 115 and a needle valve 116; the vacuum degree adjusting valve 113 can adjust the vacuum degree.
The liquid outlet of the gas-liquid separator 112 is connected to a separation return line 117; the separation/return line 117 is provided with a separation/return buffer tank 118, a separation/return buffer valve 119, a separation/return tank 120, and a separation/return valve 121. The separation return line 117 is connected to the sulphuric acid circulation tank.
The gas phase outlet of the degassing membrane contactor 101 is also connected with a leakage return pipeline 122, and a leakage return buffer tank 123, a leakage return buffer valve 124, a leakage return tank 125 and a leakage return valve 126 are arranged on the leakage return pipeline 122; the seepage return line 122 is connected with the ammonia nitrogen wastewater tank 104.
An acid inlet valve 205, an acid circulating pump 206, an acid flow regulating valve 207, an acid cartridge filter 208 and an acid flow meter 209 are arranged on a waste sulfuric acid inlet path 202 in the absorption unit.
The output port of the absorption membrane contactor 201 is also connected with a waste sulfuric acid circulating pipeline 210; the waste sulfuric acid circulating pipeline 210 is provided with a waste sulfuric acid circulating valve 211 and a waste sulfuric acid one-way valve 212; the spent sulfuric acid recycle line 210 is connected to the sulfuric acid recycle tank 204. A product valve 213 is provided on an ammonium sulfate production line 203 connected to the output port of the absorption membrane contactor 201.
The gas phase outlet of the absorption membrane contactor 201 is connected with an ammonia gas loop 214, and a gas delivery pump 215 is arranged on the ammonia gas loop 214; an ammonia gas loop 214 is connected to the gas inlet of the degassing membrane contactor 101. Excess ammonia gas flowing out via the gas phase outlet of the absorption membrane contactor 201 may enter the degassing membrane contactor 101 as purge gas, and be subjected to gas purging, to improve the efficiency of the degassing membrane contactor. Further, a purge gas amount regulating valve 216 and a purge gas flow meter 217 are provided in the ammonia gas circuit 214.
To regulate the vacuum and to ensure the amount of sweep gas entering the degassing membrane contactor, the system is also provided with an air make-up line 132; an air inlet valve 133 is arranged on the air supply pipeline 132; the air supplement pipeline is divided into two supplement branches, wherein one supplement branch is connected with the extraction pipeline 103, and the other supplement branch is connected with the ammonia loop 214; the two supply branches are both provided with an air volume adjusting valve 134.
The vacuum pump 111 is further connected with a first cooling circulation pipeline 301, the first cooling circulation pipeline 301 is connected with the waste sulfuric acid inlet pipeline 202, and waste sulfuric acid can be used as a cooling medium to cool the vacuum pump 111.
The waste sulfuric acid circulation pipeline 210 is also provided with a heat exchanger 218, the heat exchanger 218 is also connected with a second cooling circulation pipeline 302, and liquid in the waste sulfuric acid circulation pipeline 210 can be cooled by using a cooling medium. When the temperature of the ammonia nitrogen wastewater does not exceed the maximum tolerance temperature set by the membrane contactor, the cooling medium is the ammonia nitrogen wastewater; and when the temperature of the ammonia nitrogen wastewater exceeds the set maximum tolerance temperature of the membrane contactor, the cooling medium is cold water.
The water production port of the degassing membrane contactor 101 and the water production port of the absorption membrane contactor 201 are connected with online ammonia nitrogen concentration sensors to detect the ammonia nitrogen concentration online.
A pressure gauge and a pH detector are arranged on the ammonia nitrogen wastewater inlet 102 and the waste sulfuric acid inlet 202; a pressure gauge and a pH meter are also provided on the pipeline at the water production port of the degassing membrane contactor 101 and the pipeline at the water production port of the absorption membrane contactor 201. Pressure gauges are arranged on the ammonia loop 214 and the extraction pipeline 103. The pressure gauge can detect the pressure of each pipeline, and the pH detector can detect the pH of liquid in the pipeline.
And a low liquid level alarm and a high liquid level alarm are arranged on the ammonia nitrogen wastewater tank 104 and the sulfuric acid circulating tank 204 so as to detect and early warn the liquid levels.
In addition, the ammonia nitrogen wastewater tank 104 is also connected with an ammonia nitrogen wastewater supply pipeline 136 through an ammonia nitrogen wastewater supply valve 135; the sulfuric acid circulation tank 204 is also connected to a waste sulfuric acid supply line 220 through a sulfuric acid supply valve 219.
In the system, the membrane filaments in the degassing membrane contactor 101 and the absorption membrane contactor 201 are subjected to surface hydrophobicity treatment, and have air permeability, namely are air permeable and water impermeable.
The operation process of the system is as follows:
after the pH value of the ammonia nitrogen wastewater is adjusted to 11-12, the ammonia nitrogen wastewater is input into the ammonia nitrogen wastewater tank 104 through an ammonia nitrogen wastewater supply valve 135 and an ammonia nitrogen wastewater supply pipeline 136; under the action of an ammonia nitrogen wastewater pump 106, ammonia nitrogen wastewater enters a degassing membrane contactor 101 after being filtered by an ammonia nitrogen wastewater security filter 108; negative pressure is generated by controlling a vacuum pump 111 on the air pumping pipeline 103, and ammonia escaping from the ammonia nitrogen wastewater is pumped away; meanwhile, the ammonia gas is sent into the gas-liquid separator 112 by utilizing the positive pressure of the outlet of the vacuum pump, the gas-liquid separator 112 performs gas-liquid separation to obtain pure ammonia gas, and the pure ammonia gas enters the absorption membrane contactor 201 for absorption.
Only ammonia gas and other gases dissolved in the ammonia nitrogen wastewater can be pumped away through micropores on the surfaces of membrane filaments of the degassing membrane contactor 101; however, since the surface hydrophobicity and air permeability of the membrane filaments are lost after a certain period of time, the degassing membrane contactor 101 has a leakage phenomenon, that is, a small amount of ammonia nitrogen wastewater permeates the membrane filaments. At the moment, leaked ammonia nitrogen wastewater enters the leakage backflow buffer tank 123 for temporary storage under the action of gravity; after the seepage backflow buffer tank 123 is full, the leaked ammonia nitrogen wastewater enters the seepage backflow tank 125 through the seepage backflow buffer valve 124; when the seepage return tank 125 is full, the seepage return valve 126 is opened, and the leaked ammonia nitrogen wastewater enters the ammonia nitrogen wastewater tank 104 for retreatment. After the gas-liquid separator 112 performs gas-liquid separation, the separated liquid sequentially passes through the separation reflux buffer tank 118, the separation reflux buffer valve 119, the separation reflux tank 120 and the separation reflux valve 121, and enters the sulfuric acid circulation tank 204 for treatment.
Judging whether the ammonia nitrogen concentration in the ammonia nitrogen wastewater reaches the standard or not through an online ammonia nitrogen concentration sensor N-1 arranged at a water production port of the degassing membrane contactor 101; if the ammonia nitrogen water does not reach the standard, closing a water production valve 128 on an ammonia nitrogen removal water output pipeline 127, opening an ammonia nitrogen wastewater circulating valve 130 on an ammonia nitrogen wastewater circulating pipeline 129, and returning the wastewater flowing out through a water production port of the degassing membrane contactor 101 to the ammonia nitrogen wastewater tank 104 for retreatment; continuously observing an online ammonia nitrogen concentration sensor N-1 at a water production port of the degassing membrane contactor, and judging whether the ammonia nitrogen concentration reaches the standard or not; if the ammonia nitrogen wastewater reaches the standard, the ammonia nitrogen wastewater circulating valve 130 is closed, the water producing valve 128 is opened, the water producing mode is shown at this time, and the ammonia nitrogen removing water is discharged through the ammonia nitrogen removing water producing pipeline 127.
The pH-1 of the pH detector on the ammonia nitrogen wastewater inlet passage 102 and the pH-2 of the pH detector at the water producing port of the degassing membrane contactor 101 are changed, and the values are always larger than 11 and smaller than 12, and if the values are smaller than 10.5, alkali is added into the ammonia nitrogen wastewater tank 104 to increase the pH value. A pressure gauge PI-1 on the ammonia nitrogen wastewater inlet passage 102 and a pressure gauge PI-2 at the water production port of the degassing membrane contactor 101 are used as indexes for adjusting an ammonia nitrogen wastewater flowmeter 109; when any pressure exceeds the standard, the flow rate should be reduced as soon as possible to avoid a large amount of leakage from the degassing membrane contactor into the gas phase outlet. A pressure gauge PI-3 on the air extraction pipeline 103 is a vacuum gauge; the reading is observed, and the vacuum degree is adjusted by the vacuum degree adjusting valve 113 and the air amount adjusting valve 134. The cooling medium in the vacuum pump 111 adopts waste sulfuric acid filtered in the absorption unit, and the waste sulfuric acid flows back through a first cooling circulation pipeline 301, so that the leakage of ammonia gas is further reduced. The gas-liquid separator 112 may ensure that only pure gas enters the absorption unit. The low liquid level alarm LAL-1 on the ammonia nitrogen wastewater tank 104 can avoid idle damage of a wastewater pump caused by low liquid level in the tank, and the high liquid level alarm LAH-1 can prevent wastewater overflow caused by high liquid level in the ammonia nitrogen wastewater tank 104. The ammonian wastewater check valve 131 can prevent ammonian wastewater from being discharged directly without being treated by the degassing membrane contactor 101.
Waste sulfuric acid is input into the sulfuric acid circulation box 204 through a waste sulfuric acid supply pipeline 220, and under the action of an acid circulation pump 206, the waste sulfuric acid enters the absorption membrane contactor 201 after being filtered by an acid cartridge filter 208 and is used for absorbing pure ammonia gas removed from the degassing unit; pure ammonia gas removed from the degassing unit enters an absorption membrane contactor 201 to be subjected to absorption reaction with waste sulfuric acid to generate ammonium sulfate, and then mixed solution of the ammonium sulfate and the waste sulfuric acid can be circulated back to the sulfuric acid circulation box 204 through a waste sulfuric acid circulation pipeline 210; after ammonia nitrogen concentration reached standard, product valve 213 opened, and the ammonium sulfate solution will be discharged through ammonium sulfate output pipeline 203 to carry out the retrieval and utilization of pure concentrated ammonium sulfate. The waste sulfuric acid circulating pipeline 204 is provided with a heat exchanger 218, so that the temperature of the solution can be prevented from rising due to absorption reaction; the cooling medium in the heat exchanger 218 adopts circulating ammonia nitrogen wastewater subjected to degassing treatment in a degassing unit; and the waste heat of the absorption unit is utilized in the heat exchange process, so that the water inlet temperature of the degassing unit can be further increased, the overall efficiency of the system is improved, and the energy consumption such as electric heating is reduced. And when the temperature of the ammonia nitrogen wastewater exceeds the set maximum tolerance temperature of the membrane contactor, cold water can be used as a cooling medium of the heat exchanger.
After passing through the absorption membrane contactor 201, the excess ammonia gas enters the degassing membrane contactor 101 again through the gas delivery pump 215 for gas purging, thereby improving the efficiency of the degassing unit.
Judging whether the ammonia nitrogen concentration reaches the standard or not by checking an online ammonia nitrogen sensor N-2 at the output port of the absorption membrane contactor 201, and judging whether the waste sulfuric acid needs to be added or discharged or not by observing the pH-4 of a pH detector at the output port of the absorption membrane contactor 201 and the pH-3 of a pH detector on the waste sulfuric acid inlet path 202; if the pH value is less than 2 and the on-line ammonia nitrogen sensor N-2 does not reach the expectation, the product valve 213 is closed, the waste sulfuric acid circulating valve 211 is opened, and the circulation mode is adopted; continuously observing the on-line ammonia nitrogen sensor N-2 and the pH value of the pH detector to be 4, and judging the absorption condition of the sulfuric acid wastewater. After the pH-4 value of the pH detector is more than 2, opening a sulfuric acid supply valve 219 to supplement acid until the acid is less than 2, and continuing to operate circularly; and when the on-line ammonia nitrogen sensor N-2 displays that the ammonia nitrogen concentration reaches the standard, closing the waste sulfuric acid circulating valve 211, opening the product valve 213, and discharging ammonium sulfate, wherein the water production mode is adopted at the moment.
Note that the pH of the sulfuric acid waste water should be less than 4 for absorption, and if too large, the waste sulfuric acid is added to the sulfuric acid recycle tank. A pressure gauge PI-4 on the extraction pipeline 103 and pressure gauges PI-5 and PI-6 on the ammonia loop 214 are used as indexes for adjusting the purging gas flow meter; when any pressure exceeds the standard, the flow should be reduced as soon as possible by the purge gas amount regulating valve 216, so as to avoid the danger caused by the overload of the system. In addition, an air inlet is added to the front end of the gas delivery pump 215 on the ammonia gas loop 214, air is supplemented by the air supplement line 132, and the intake air amount is controlled by the purge air amount regulating valve 216 at the gas delivery pump 215 to ensure that the amount of purge air entering the degassing unit is sufficient for gas purging. The pressure gauge PI-7 on the waste sulfuric acid inlet path 202 and the pressure gauge PI-8 at the outlet of the absorption membrane contactor 201 are used as indexes for adjusting the acid flow meter 209. The low liquid level alarm LAL-2 on the sulfuric acid circulation tank 204 can prevent the idle damage of the acid circulation pump caused by the low liquid level in the sulfuric acid circulation tank, and the high liquid level alarm LAH-2 on the sulfuric acid circulation tank 204 can prevent the overflow of liquid caused by the high liquid level in the sulfuric acid circulation tank. The waste sulfuric acid check valve 212 may prevent sulfuric acid wastewater from directly entering the ammonium sulfate production line 203 to be discharged without being treated by the absorption membrane contactor 201.
The above description is only an embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes performed by the present invention or directly or indirectly applied to other related technical fields are included in the scope of the present invention.
Claims (11)
1. The utility model provides a system for utilize membrane contactor to produce pure concentrated ammonium sulfate which characterized in that: comprises a degassing unit for removing ammonia gas from ammonia nitrogen wastewater and an absorption unit for absorbing ammonia gas;
the degassing unit comprises a degassing membrane contactor, an ammonia nitrogen wastewater inlet passage connected with a wastewater inlet of the degassing membrane contactor, and an air pumping pipeline connected with a gas phase outlet of the degassing membrane contactor; the ammonia nitrogen wastewater inlet path is connected with an ammonia nitrogen wastewater tank;
the absorption unit comprises an absorption membrane contactor, a waste sulfuric acid inlet path connected with a waste acid inlet of the absorption membrane contactor, and an ammonium sulfate output pipeline connected with an output port of the absorption membrane contactor; the waste sulfuric acid inlet path is connected with a sulfuric acid circulating box;
the gas extraction pipeline of the degassing unit is connected with the ammonia gas inlet of the absorption membrane contactor of the absorption unit; and an ammonium sulfate output pipeline of the absorption membrane contactor outputs waste sulfuric acid to absorb ammonium sulfate generated by ammonia gas.
2. The system for producing pure concentrated ammonium sulfate by using a membrane contactor as claimed in claim 1, wherein: a vacuum pump and a gas-liquid separator are arranged on the air extraction pipeline; the outlet of the gas-liquid separator outputs pure ammonia gas.
3. The system for producing pure concentrated ammonium sulfate by using a membrane contactor as claimed in claim 1, wherein: a gas phase outlet of the degassing membrane contactor is connected with a leakage return pipeline, and a leakage return buffer tank, a leakage return buffer valve, a leakage return tank and a leakage return valve are arranged on the leakage return pipeline; the leakage return pipeline is connected with the ammonia nitrogen wastewater tank.
4. The system for producing pure concentrated ammonium sulfate by using a membrane contactor as claimed in claim 1, wherein: the degassing membrane contactor is also provided with a water producing port, and the water producing port is connected with an ammonia nitrogen removal water producing pipeline.
5. The system for producing pure concentrated ammonium sulfate by using the membrane contactor as claimed in claim 4, wherein: an ammonia nitrogen wastewater circulating pipeline is connected to a water producing port of the degassing membrane contactor; an ammonia nitrogen wastewater circulating valve and an ammonia nitrogen wastewater one-way valve are arranged on the ammonia nitrogen wastewater circulating pipeline; the ammonia nitrogen wastewater circulating pipeline is connected with the ammonia nitrogen wastewater box.
6. The system for producing pure concentrated ammonium sulfate by using a membrane contactor as claimed in claim 1, wherein: the output port of the absorption membrane contactor is also connected with a waste sulfuric acid circulating pipeline; the waste sulfuric acid circulating pipeline is provided with a waste sulfuric acid circulating valve and a waste sulfuric acid one-way valve; the waste sulfuric acid circulating pipeline is connected with the sulfuric acid circulating box.
7. The system for producing pure concentrated ammonium sulfate by using the membrane contactor as claimed in claim 1, wherein: the gas phase outlet of the absorption membrane contactor is connected with an ammonia loop, and a gas delivery pump is arranged on the ammonia loop; and the ammonia loop is connected with the air inlet of the degassing membrane contactor.
8. The system for producing pure concentrated ammonium sulfate by using a membrane contactor as claimed in claim 1, wherein: an ammonia nitrogen wastewater inlet valve, an ammonia nitrogen wastewater pump, an ammonia nitrogen wastewater flow regulating valve, an ammonia nitrogen wastewater security filter, an ammonia nitrogen wastewater flowmeter and a liquid phase maintenance valve are arranged on the ammonia nitrogen wastewater inlet path; and the waste sulfuric acid inlet path is provided with an acid inlet valve, an acid circulating pump, an acid flow regulating valve, an acid security filter and an acid flow meter.
9. The system for producing pure concentrated ammonium sulfate by using the membrane contactor as claimed in claim 2, wherein: the vacuum pump is also connected with a first cooling circulation pipeline which is connected with the waste sulfuric acid inlet pipeline.
10. The system for producing pure concentrated ammonium sulfate by using a membrane contactor as claimed in claim 6, wherein: and a heat exchanger is also arranged on the waste sulfuric acid circulating pipeline, and the heat exchanger is also connected with a cooling circulating pipeline II.
11. The system for producing pure concentrated ammonium sulfate by using the membrane contactor as claimed in claim 4, wherein: and the water production port of the degassing membrane contactor and the water production port of the absorption membrane contactor are connected with online ammonia nitrogen concentration sensors.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211371652.7A CN115650347A (en) | 2022-11-03 | 2022-11-03 | System for utilize membrane contactor production pure concentrated ammonium sulfate |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211371652.7A CN115650347A (en) | 2022-11-03 | 2022-11-03 | System for utilize membrane contactor production pure concentrated ammonium sulfate |
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| CN115650347A true CN115650347A (en) | 2023-01-31 |
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| CN202211371652.7A Pending CN115650347A (en) | 2022-11-03 | 2022-11-03 | System for utilize membrane contactor production pure concentrated ammonium sulfate |
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- 2022-11-03 CN CN202211371652.7A patent/CN115650347A/en active Pending
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