Device for treating ammonium chloride wastewater with hypochlorous acid
The problem of membrane blocking and high energy consumption in electrodialysis technology is solved by combining the falling film evaporator and the microchannel reactor with hypochlorous acid, and the low-cost and efficient ammonia nitrogen removal effect is achieved.
Patent Information
- Application Number
- CN202422164810.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-04
- Publication Date
- 2025-08-15
- Estimated Expiration
- 2034-09-04
AI Technical Summary
The existing electrodialysis technology has problems such as membrane blockage, high equipment cost, large energy consumption and poor stability when treating ammonium chloride wastewater, making it difficult to effectively remove ammonia nitrogen.
A combination device of falling film evaporator, heater, microchannel reactor, hypochlorous acid agent barrel and acid solution tank is used to react chemically in the microchannel reactor with hypochlorous acid and ammonium chloride wastewater to generate nitrogen and hydrogen chloride. The reaction ratio is controlled by an ammonium measuring instrument, and the generated nitrogen is discharged, and hydrogen chloride is dissolved in water to form an acidic solution for subsequent treatment.
It realizes low-energy and high-efficiency ammonia nitrogen removal, the device structure is simple, the purchase cost is low, the ammonia nitrogen removal rate is high, and the equipment energy consumption is low.
Smart Images
Figure CN223225803U_ABST
Abstract
Description
Technical field:
[0001] The utility model belongs to the field of ammonia nitrogen wastewater treatment, in particular to a device for treating ammonium chloride wastewater with hypochlorous acid. Background technology:
[0002] China is a major producer of rare earths, with an annual output of over 200,000 tons of rare earth oxides. Because ammonia and ammonium bicarbonate are excellent saponifying and precipitating agents required in the rare earth separation and smelting process, the production process generates large quantities of ammonium chloride wastewater. For this type of ammonium chloride wastewater with low ammonia nitrogen concentrations, electrodialysis-evaporation concentration is currently the primary method. Electrodialysis is primarily implemented through membrane separation technology. With the continuous advancement of membrane technology and the development of new membrane processes, electrodialysis has become increasingly widespread. Its principle is to utilize membrane technology to create different permeabilities for different particles within the membrane, thereby separating harmful substances from wastewater. However, wastewater contaminants with excessively high levels of calcium and magnesium impurities can easily clog the membranes, hindering wastewater treatment. Furthermore, the initial investment cost of electrodialysis equipment is high. Electrodialysis equipment consumes significant energy, and plastic degradation increases maintenance costs. Furthermore, the operating current and voltage of electrodialysis are affected by the quality and quantity of the raw water, resulting in poor process stability and prone to degradation. Utility model content:
[0003] To solve the above problems, the purpose of the utility model is to provide a device for treating ammonium chloride wastewater with hypochlorous acid, which has a simple structure, low energy consumption and high efficiency. The device has a high ammonia nitrogen removal rate for ammonium chloride wastewater with low ammonia nitrogen concentration.
[0004] The utility model is implemented by the following technical solutions: a device for treating ammonium chloride wastewater with hypochlorous acid, comprising: a falling film evaporator, a heater, a microchannel reactor, a hypochlorous acid agent barrel, an ammonium chloride wastewater tank and an acidic solution tank;
[0005] The secondary steam outlet of the falling film evaporator is connected to the medium inlet of the heater, the medium outlet of the heater is connected to the heating inlet of the microchannel reactor through a pipeline, and the heating outlet of the microchannel reactor is connected to the medium inlet of the heater; the outlet of the hypochlorous acid agent barrel and the outlet of the ammonium chloride wastewater tank are both connected to the material inlet of the microchannel reactor through pipelines; the material outlet of the microchannel reactor is connected to the inlet of the acidic solution tank through a pipeline.
[0006] Furthermore, the microchannel reactor includes an aerogel outer sleeve and a graphite inner sleeve, the graphite inner sleeve is sleeved in the aerogel outer sleeve, and both ends of the graphite inner sleeve extend to the outside of the aerogel outer sleeve; a stirring shaft is provided in the graphite inner sleeve, the bottom of the stirring shaft is provided with stirring blades, the top of the stirring shaft extends to the outside of the graphite inner sleeve and is connected to the output shaft of the motor; a heating inlet is provided at the lower part of the aerogel outer sleeve, a heating outlet is provided at the upper part of the aerogel outer sleeve, and the heating inlet and heating outlet are distributed on both sides of the aerogel outer sleeve; a material inlet and an exhaust port are provided at the top of the graphite inner sleeve, and a material outlet is provided at the bottom of the graphite inner sleeve.
[0007] Furthermore, an ammonium detector is provided on the pipeline connecting the material outlet of the microchannel reactor and the inlet of the acidic solution pool.
[0008] Advantages of this utility model:
[0009] The utility model has a simple structure, low equipment purchase cost and convenient operation; the device has a high ammonia nitrogen removal rate for ammonium chloride wastewater with low ammonia nitrogen concentration, and the equipment energy consumption is low. Description of the drawings:
[0010] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0011] Figure 1 This is a schematic diagram of the structure of a device for treating ammonium chloride wastewater with hypochlorous acid.
[0012] Falling film evaporator 1, heater 2, microchannel reactor 3, aerogel outer sleeve 3.1, graphite inner sleeve 3.2, stirring blade 3.3, motor 3.4, hypochlorous acid agent barrel 4, ammonium chloride wastewater tank 5, acidic solution tank 6, ammonium detector 7. Specific implementation method:
[0013] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0014] A device for treating ammonium chloride wastewater with hypochlorous acid comprises: a falling film evaporator 1, a heater 2, a microchannel reactor 3, a hypochlorous acid reagent drum 4, an ammonium chloride wastewater tank 5, and an acidic solution tank 6. The secondary steam outlet of the falling film evaporator 1 is connected to the medium inlet of the heater 2. The medium outlet of the heater 2 is connected to the heating inlet of the microchannel reactor 3 via a pipeline, and the heating outlet of the microchannel reactor 3 is connected to the medium inlet of the heater 2. To ensure a stable temperature of 50°C in the microchannel reactor 3, the secondary steam from the falling film evaporator 1 is heated by the heater 2 before being transported to the channel reactor 3. To fully utilize the heat of the secondary steam, the steam, after heat exchange in the microchannel reactor 3, is returned to the heater 2 for heating and recycling. The outlets of the hypochlorous acid reagent drum 4 and the ammonium chloride wastewater tank 5 are both connected to the material inlet of the microchannel reactor 3 via pipelines. The material outlet of the microchannel reactor 3 is also connected to the inlet of the acidic solution tank 6 via a pipeline.
[0015] In a specific embodiment, the microchannel reactor 3 includes an aerogel outer sleeve 3.1 and a graphite inner sleeve 3.2. The graphite inner sleeve 3.2 is sleeved in the aerogel outer sleeve 3.1, and both ends of the graphite inner sleeve 3.2 extend to the outside of the aerogel outer sleeve 3.1; the aerogel material is selected to make the aerogel outer sleeve, which has good thermal insulation effect and prevents heat loss; the graphite material is used to make the graphite inner sleeve, which has a high thermal conductivity and corrosion resistance and is not easily corroded by hypochlorous acid.
[0016] A stirring shaft is provided inside the graphite inner cylinder 3.2, and a stirring blade 3.3 is provided at the bottom of the stirring shaft. The top of the stirring shaft extends to the outside of the graphite inner cylinder 3.2 and is connected to the output shaft of the motor 3.4; a heating inlet is provided at the bottom of the aerogel outer cylinder 3.1, and a heating outlet is provided at the top of the aerogel outer cylinder 3.1, and the heating inlet and heating outlet are distributed on both sides of the aerogel outer cylinder 3.1; a material inlet and an exhaust port are provided at the top of the graphite inner cylinder 3.2, and a material outlet is provided at the bottom of the graphite inner cylinder 3.2.
[0017] In one embodiment, an ammonium meter 7 is provided on a pipeline connecting the material outlet of the microchannel reactor 3 and the inlet of the acidic solution reservoir 6. The ammonium ion concentration in the water is detected by the ammonium meter 7. When the ammonium ion concentration drops to 2.8%, the water quality standard has been met, and the addition ratio of hypochlorous acid to ammonium chloride wastewater is optimal. The ammonia meter in this embodiment is manufactured by Xylem (Nanjing) Co., Ltd. and its model number is TCU / A 111Pro.
[0018] The working process of the device for treating ammonium chloride wastewater with hypochlorous acid in this embodiment is as follows: the hypochlorous acid solution in the hypochlorous acid reagent barrel 4 and the ammonium chloride wastewater in the ammonium chloride wastewater pool 5 are added to the graphite inner cylinder 3.2. At the same time, secondary steam heated by the heater is passed into the jacket formed between the aerogel outer sleeve 3.1 and the graphite inner cylinder 3.2 to heat the mixture of the hypochlorous acid solution and the ammonium chloride wastewater in the graphite inner cylinder 3.2 to achieve reaction conditions. At the same time, under the stirring action of the stirring blades, the hypochlorous acid solution and the ammonium chloride wastewater in the graphite inner cylinder 3.2 are uniformly mixed and chemically reacted to generate nitrogen and hydrogen chloride. The generated nitrogen is discharged from the exhaust port, and the hydrogen chloride dissolves in water to form an acidic solution, which is discharged from the material outlet into the acidic solution pool 6 for subsequent pH control of the wastewater treatment. The secondary steam after heat exchange is returned to the heater for recycling.
[0019] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims
1. A device for treating ammonium chloride wastewater with hypochlorous acid, characterized in that: It includes: Falling film evaporator, heater, microchannel reactor, hypochlorous acid reagent barrel, ammonium chloride wastewater pool and acid solution pool; The secondary steam outlet of the falling film evaporator is connected to the medium inlet of the heater, the medium outlet of the heater is connected to the heating inlet of the microchannel reactor through a pipeline, and the heating outlet of the microchannel reactor is connected to the medium inlet of the heater; the outlet of the hypochlorous acid agent barrel and the outlet of the ammonium chloride wastewater tank are both connected to the material inlet of the microchannel reactor through pipelines; the material outlet of the microchannel reactor is connected to the inlet of the acidic solution tank through a pipeline.
2. A device for treating ammonium chloride wastewater with hypochlorous acid according to claim 1, characterized in that, The microchannel reactor includes an aerogel outer sleeve and a graphite inner sleeve. The graphite inner sleeve is sleeved in the aerogel outer sleeve, and both ends of the graphite inner sleeve extend to the outside of the aerogel outer sleeve; a stirring shaft is provided in the graphite inner sleeve, and a stirring blade is provided at the bottom of the stirring shaft. The top of the stirring shaft extends to the outside of the graphite inner sleeve and is connected to the output shaft of the motor; a heating inlet is provided at the lower part of the aerogel outer sleeve, and a heating outlet is provided at the upper part of the aerogel outer sleeve, and the heating inlet and the heating outlet are distributed on both sides of the aerogel outer sleeve; a material inlet and an exhaust port are provided at the top of the graphite inner sleeve, and a material outlet is provided at the bottom of the graphite inner sleeve.
3. A device for treating ammonium chloride wastewater with hypochlorous acid according to claim 1 or 2, characterized in that, An ammonium detector is provided on the pipeline connecting the material outlet of the microchannel reactor and the inlet of the acidic solution pool.