Powder adding device

Abstract

The utility model relates to a powder adding device which is communicated with an aeration pipe, the aeration pipe comprises an aeration main pipe, the powder adding device is arranged on the aeration main pipe, the powder adding device comprises a first straight pipe section, a taper pipe section and a second straight pipe section which are coaxially arranged, the first straight pipe section is fixedly connected with the small-diameter end of the taper pipe section, and the second straight pipe section is fixedly connected with the small-diameter end of the taper pipe section. One end of the second straight pipe section is fixedly connected with the large-diameter end of the taper pipe section, the other end of the second straight pipe section is inserted into the aeration main pipe, the first straight pipe section is located at the uppermost part, one side of the first straight pipe section is provided with an air inlet, the air inlet is located in the tangential direction of the first straight pipe section, and semiconductor powder is blown into the first straight pipe section through the air inlet.

Description

Technical Field

[0001] The utility model relates to the field of sewage treatment, in particular to a powder adding device. Background Art

[0002] Semi-coke wastewater mainly comes from coal pyrolysis and raw gas purification, as well as the refining process of related coal chemical products. It is a mixed wastewater from different sections. The wastewater contains high concentrations of oil, phenols, ammonia nitrogen, carbon dioxide, hydrogen sulfide and some difficult-to-degrade organic pollutants, and all indicators are more than 10 times higher than ordinary coking wastewater. It is an industrial wastewater with low biodegradability and extremely difficult to treat. If the various high-concentration pollutants in the semi-coke wastewater are not effectively treated, it will have a huge impact on both the wastewater treatment process and the natural environment. At present, there is no mature process specifically for the treatment of semi-coke wastewater.

[0003] At present, the treatment of semi-coke wastewater in industry still follows the treatment process of coal gasification wastewater and coking wastewater. The main processes include pretreatment process, secondary treatment process and tertiary treatment process. The pretreatment process includes two units: deoiling and dust removal and phenol-ammonia recovery. The deoiling and dust removal unit mainly uses static separation, flotation and centrifugation to separate heavy oil, light oil and part of coal slag from water; the phenol-ammonia recovery unit uses stripping, cooling flash, liquid-liquid extraction and distillation to remove and recover acid gas, ammonia and phenols. In secondary treatment, the oxidation and decomposition of anaerobic and aerobic microorganisms are generally used to remove residual organic matter. In some industrial projects, incineration is used for treatment, but due to its economic reasons, it cannot be promoted on a large scale. Tertiary treatment mainly uses advanced oxidation and adsorption methods to treat some difficult-to-degrade organic matter and color to meet emission standards.

[0004] The bottleneck problem in the treatment of semi-coke wastewater is oil removal. At present, in the industry, both the deoiling and dust removal unit and the biochemical unit in the semi-coke wastewater treatment process can remove oil pollution. However, because high-concentration oil pollutants have strong biological toxicity, they will make the microorganisms in the biochemical unit lose their activity, thereby affecting the wastewater treatment efficiency. Therefore, the removal of oil pollutants is mainly concentrated in the deoiling and dust removal unit. Due to the unsatisfactory removal effect, the oil substances remaining in the wastewater will greatly affect the subsequent treatment units. The residue of a large amount of oil substances will not only cause the equipment and pipelines of the phenol-ammonia recovery unit to be blocked, making it difficult for the device to operate continuously, but also the toxic hydrocarbons in the oil will poison the microorganisms in the biochemical treatment unit, or even kill them, causing the biochemical unit to be paralyzed and affecting the wastewater treatment. For the natural environment, the oil substances in the wastewater float on the water surface and form a dense film, thereby preventing the oxygen in the air from freely entering and exiting the water body, causing the dissolved oxygen in the water to decrease, leading to the death of some organisms due to lack of oxygen, and also affecting the photosynthesis of aquatic plants, destroying the ecological balance. According to actual industrial experience, the oil content of wastewater entering the phenol-ammonia wastewater unit needs to be reduced as much as possible, otherwise the oil will adhere to the tower plates and heat exchanger pipes, causing the equipment treatment efficiency to decrease, thereby affecting the phenol-ammonia removal efficiency. In addition, due to the continuous accumulation of oil pollution in the pipeline, the maintenance cycle of the phenol-ammonia unit is greatly shortened, resulting in its inability to operate stably for a long time. At the same time, the oil content of the effluent from the phenol-ammonia unit will also increase accordingly, which will increase the treatment load of the biochemical unit, affect the activity of microorganisms, and bring great difficulties to wastewater treatment.

[0005] The effect of oil removal is mainly related to the degree of removal of emulsified oil in wastewater. The oil in semi-coke wastewater is mainly insoluble tar eluted by cooling. According to the different forms of insoluble tar in water, it can be divided into floating oil, dispersed oil, emulsified oil and dissolved oil.

[0006] (1) Floating oil: It is the most common form of oil in semi-coal wastewater. It usually floats or aggregates on the water surface in a continuous phase state to form a stable oil film or oil layer. The oil droplets in the floating oil are relatively large, generally greater than 100μm, accounting for 70% to 95% of the oil content in the wastewater. It can be separated from the wastewater by simple physical methods.

[0007] (2) Dispersed oil: refers to oil suspended in the water phase, usually dispersed in the water phase in the form of tiny oil droplets, with a particle size of 10 to 100 μm. The state of dispersed oil is easily affected by conditions such as temperature, flow state and mixing intensity, so the range of variation of oil droplet size is large. If there is an electric charge on the surface of the oil droplet or it is subjected to mechanical external force, the dispersed oil is relatively stable; otherwise it is unstable and can be separated by standing for a long time, so dispersed oil is relatively easy to remove from water.

[0008] (3) Emulsified oil: Due to the presence of surfactants, oil exists in water in an emulsified state. Surfactants can turn oil droplets into charged nuclei. Due to the influence of surface energy and polarity, the charged oil droplet nuclei can adsorb oppositely charged ions or polar water molecules in water to form an interfacial film between the oil and water phases, preventing the oil droplets from colliding and agglomerating, and dispersing them more stably in water. The particle size of emulsified oil droplets is less than 10μm, generally between 100 and 2000nm, and it is difficult to remove them using traditional oil removal methods.

[0009] (4) Dissolved oil: refers to oil that exists in water in a molecular state. The oil droplet size is generally only a few nanometers, and the oil and water are a homogeneous system, which is extremely stable and very difficult to remove. However, because the solubility of oil droplets in water is very small, the content in water is generally less than 0.5%.

[0010] The floating oil and dispersed oil in the lignite wastewater are not stable in water and can be removed by simple physical sedimentation or decantation. However, the emulsified oil is difficult to remove using traditional methods due to its small particle size and the presence of an oil-water interface film. This is the main reason why the oil concentration in the lignite wastewater remains high after passing through the deoiling and dust removal unit.

[0011] In the current process of treating semi-coke wastewater, some people use photo-oxidation catalytic technology to treat wastewater. However, when adding semiconductor powder to wastewater, the semiconductor powder will usually agglomerate in the wastewater, so it is necessary to stir it continuously during the addition process. However, some semiconductor powder will not be stirred. Utility Model Content

[0012] The main purpose of the utility model is to provide a powder adding device, which can prevent semiconductor powder from agglomerating during the adding process by combining the powder adding device with an aeration pipe.

[0013] In order to achieve the above-mentioned purpose, the utility model provides a powder adding device, which is connected to an aeration pipe, the aeration pipe includes an aeration main pipe, the powder adding device is arranged on the aeration main pipe, the powder adding device includes a first straight pipe section, a tapered pipe section and a second straight pipe section which are coaxially arranged, the first straight pipe section is fixedly connected to the small diameter end of the tapered pipe section, one end of the second straight pipe section is fixedly connected to the large diameter end of the tapered pipe section, the other end of the second straight pipe section is inserted into the aeration main pipe, the first straight pipe section is located at the top, an air inlet is provided on one side of the first straight pipe section, the air inlet is located in the tangent direction of the first straight pipe section, and the semiconductor powder is blown into the first straight pipe section through the air inlet.

[0014] Preferably, the first straight pipe section is provided with an anti-escape pipe, and the anti-escape pipe is coaxially arranged with the first straight pipe section.

[0015] Further preferably, the anti-escape tube is a tapered tube, the small diameter end of the anti-escape tube is fixedly connected to the first straight pipe section, the small diameter end of the anti-escape tube is communicated with the outside, and the large diameter end of the anti-escape tube is not inserted into the tapered pipe section.

[0016] More preferably, the first straight pipe section is also coaxially provided with an injection pipe, one end of the injection pipe is connected to the compressor, and the other end of the injection pipe is inserted into the second straight pipe section.

[0017] More preferably, the gas ejected from the jet pipe can enter the aeration main pipe, and the semiconductor powder can flow in the aeration device along with the gas ejected from the jet pipe, and escape from the aeration device along with the gas, thereby entering the supernatant.

[0018] The beneficial effects of the utility model are:

[0019] The powder adding device of the utility model can add semiconductor powder to the semi-conductor wastewater by combining the device with the aeration pipe, thereby avoiding the agglomeration phenomenon caused by directly adding the semiconductor powder to the semi-conductor wastewater, so that the powder adding device replaces the stirring device. The device has a simple structure and a low manufacturing cost, and effectively saves production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0021] Figure 1 It is a process flow chart of the utility model;

[0022] Figure 2 It is a structural schematic diagram of the third reaction tank of the utility model;

[0023] Figure 3 It is a structural schematic diagram of the powder adding device of the utility model.

[0024] Description of Reference Numerals

[0025] 10. The third reaction tank; 20. The aeration device;

[0026] 30. Powder adding device; 31. Air inlet; 32. First straight pipe section;

[0027] 33. Conical pipe section; 34. Second straight pipe section; 35. Anti-escape pipe; 36. Jet pipe. DETAILED DESCRIPTION

[0028] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0029] like Figure 1 As shown, this embodiment provides an efficient treatment process for high-oil blue carbon wastewater, including the following steps:

[0030] S100: Acid adjustment and destabilization - acid addition: draw the semi-coal wastewater into the first reaction tank, add appropriate sulfuric acid into the reaction tank and stir for 2-3 minutes, so that the pH value of the semi-coal wastewater is 3.5-4.5;

[0031] S200: Acid adjustment and destabilization - coagulation: After the stirring stops, add 100ppm polyaluminium chloride and polyacrylamide into the reaction tank, and after the suspended matter in the semi-coke wastewater is coagulated and precipitated, the supernatant is extracted into the second reaction tank;

[0032] S300: Demulsification and oil removal: Add 1000ppm of compound demulsifier to the supernatant and add suitable polyacrylamide for floc precipitation;

[0033] In this embodiment, the above steps S100-S300 are the acid adjustment and destabilization stage and the demulsification and oil removal stage of this application. It can be known from the stabilization mechanism of emulsified oil that the oil droplets are charged due to the ionization and adsorption of the surfactant, so that the oil-water interface forms a double electric layer structure similar to the Stern model, which prevents the oil droplets from colliding and agglomerating. When the pH value in the system decreases, H + Started to increase, H + Due to the repulsive effect between the charges, the oil enters the adsorption layer on the surface of the oil droplets, causing the double electrical layer structure to be destroyed. The oil droplets become neutral and aggregate with each other to form larger oil droplets, which increases the contact probability between the demulsifier and the oil droplets and greatly improves the oil removal efficiency. Therefore, in this embodiment, the pH value is reduced to between 3.5 and 4.5 to facilitate the subsequent process.

[0034] S400: Iron-carbon micro-electrolysis: The supernatant in step S300 is extracted into a third reaction tank, and an iron-carbon micro-electrolysis reaction is performed in the third reaction tank.

[0035] This step is the iron-carbon micro-electrolysis stage. As mentioned above, the wastewater after oil removal is still in an acidic state. The iron-carbon micro-electrolysis technology has two advantages: 1. Iron-carbon micro-electrolysis is best performed under the condition of pH 4. At the same time, the pH of the wastewater will rise to neutral or weak alkaline after electrolysis (this is because during the reaction, in the micro-electrolysis process, iron is oxidized as the anode to form Fe 2+ and Fe 3+ Plasma, while producing hydroxide precipitates, which can adsorb and co-precipitate pollutants. In addition, the generated hydrogen ions will cause the pH value of the wastewater to decrease. However, as the micro-electrolysis reaction proceeds, the acidic substances in the wastewater are gradually consumed and the pH value will gradually rise. At the same time, some alkaline substances, such as iron hydroxide, are produced during the corrosion process of iron, which will also cause the pH value to rise. Therefore, after the wastewater is treated with micro-electrolysis, the pH value usually rises to the neutral or weakly alkaline range). As a connecting process between oil removal and deamination, it can reduce the amount of alkali required to adjust the pH of the denitrification unit; 2. Iron-carbon micro-electrolysis technology has strong advantages for difficult-to-degrade industrial wastewater: (1) Reduce the COD of wastewater; (2) Break the ring and chain to improve the biodegradability of wastewater; (3) Reduce the toxicity of wastewater; (4) Remove the color of wastewater.

[0036] Principle of iron-carbon micro-electrolysis: Iron-carbon micro-electrolysis is based on the primary cell reaction in electrochemistry. When iron and carbon are immersed in an electrolyte solution, due to the electrode potential difference of 1.2V between Fe and C, countless micro-battery systems will be formed, forming an electric field in its action space. The newly generated divalent iron ions produced by the anode reaction have strong reducing ability, which can reduce some organic matter, and can also open the double bonds of some unsaturated groups (such as carboxyl-COOH, azo-N=N-), so that some difficult-to-degrade cyclic and long-chain organic matter can be decomposed into biodegradable small-molecule organic matter to improve biodegradability. In addition, divalent and trivalent iron ions are good flocculants, especially the newly generated divalent iron ions have higher adsorption-flocculation activity. Adjusting the pH of wastewater can turn iron ions into flocculent precipitation of hydroxides, adsorbing suspended or colloidal microparticles and organic polymers in sewage, which can further reduce the chromaticity of wastewater, and remove some organic pollutants to purify wastewater. The cathode reaction produces a large amount of new ecological [H] and [O]. Under slightly acidic conditions, these active ingredients can undergo redox reactions with many components in the wastewater, causing chain scission and degradation of organic macromolecules, thereby eliminating the color of the organic wastewater and improving the biodegradability of the wastewater.

[0037] S500: Ammonia evaporation: extract the supernatant after iron-carbon micro-electrolysis to the fourth reaction tank, adjust its pH value to 8.5-9.5 and then perform deammoniation treatment. Preferably, the pH value is adjusted to 8.5-9.5 and then perform deammoniation treatment. The COD and toxicity of the semi-coke wastewater after micro-electrolysis are greatly reduced, and then the deammoniation, i.e., ammonia evaporation system, is used to reduce the ammonia nitrogen in the wastewater from 3000-5000 mg / L to less than 200 mg / L.

[0038] S600: Photocatalytic oxidation: The supernatant after the deammoniation treatment in step S500 is extracted into a fifth reaction tank and subjected to photocatalytic oxidation treatment by semiconductor powder.

[0039] In this step, the photocatalytic oxidation technology is that the photocatalytic material (photosensitizer, etc.) can produce several powerful oxidizing radicals under the action of ultraviolet or visible light: hydroxyl radical (·OH), ozone (O 3 ), superoxide radicals (·O 2 ), and can non-selectively degrade pollutants in wastewater through redox reactions.

[0040] In this step, the photocatalytic oxidation material is made into a powder (i.e., semiconductor powder) and added to the supernatant to accelerate the oxidation reaction. However, in the process of adding the semiconductor powder to the supernatant, agglomeration effect is easily generated, that is, the semiconductor powder agglomerates in the supernatant without being dispersed. Therefore, a stirring device is required to break up the semiconductor powder during the addition process, but agglomeration still occurs during the stirring process. In addition, in order to increase the reaction speed, an aeration device 20 is usually added in this step.

[0041] In this embodiment, the powder adding device 30 is effectively combined with the aeration device 20. The semiconductor powder is blown into the supernatant by the aeration device 20, so that the powder can enter the supernatant more evenly. At the same time, there is no need to set a stirring device.

[0042] Specifically, in this embodiment, Figure 2 and Figure 3 As shown, the fourth reaction tank includes a tank body, an aeration pipe arranged inside the tank body, and a powder adding device 30 arranged above the tank body, and the powder adding device 30 is connected to the aeration pipe. The aeration pipe includes an aeration main pipe, and the powder adding device 30 is arranged on the aeration main pipe.

[0043] Specifically, the powder adding device 30 includes a first straight pipe section 32, a conical pipe section 33 and a second straight pipe section 34 which are coaxially arranged. The first straight pipe section 32 is fixedly connected to the small diameter end of the conical pipe section 33, one end of the second straight pipe section 34 is fixedly connected to the large diameter end of the conical pipe section 33, and the other end of the second straight pipe section 34 is inserted into the aeration main pipe. The first straight pipe section 32 is located at the top, and an air inlet 31 is provided on one side of the first straight pipe section 32. The air inlet 31 is located in the tangential direction of the first straight pipe section 32, and the semiconductor powder is blown into the straight pipe section through the air inlet 31. When the semiconductor powder is blown into the first straight pipe section 32 and then enters the tapered pipe section 33, the tapered pipe section 33 is used to slow down the semiconductor powder to prevent it from falling into the second straight pipe section 34 too quickly. The semiconductor powder entering the second straight pipe section 34 enters the lifting main pipe of the aeration device 20, flows with the gas sprayed toward the aeration main pipe, and finally escapes through the aeration holes in the aeration device 20, thereby entering the supernatant.

[0044] In this embodiment, the first straight pipe section 32 is also coaxially provided with an air jet 36, one end of which is connected to the compressor, and the other end of which is inserted into the second straight pipe section 34. In this way, the air jet 36 can be directly connected to the aeration device 20, and the air jet 36 can absorb the semiconductor powder that falls on the aeration main pipe facing the second straight pipe section 34. In addition, in order to prevent the recoil phenomenon generated by the jet pipe 36 from disturbing the airflow of the conical pipe section 33 and the first straight pipe section 32, an anti-escape pipe 35 is provided in the first straight pipe section 32, and the anti-escape pipe 35 is coaxially arranged with the first straight pipe section 32, so that the recoiled airflow can rush out of the first straight pipe section 32 through the anti-escape pipe 35. At the same time, in order to prevent the semiconductor powder from escaping to the outside with the recoil airflow, the anti-escape pipe 35 is inserted into the first branch pipe. At the same time, the anti-escape pipe 35 is set as a conical pipe, and the small diameter end of the anti-escape pipe 35 is fixedly connected to the first straight pipe section 32, and the small diameter end of the anti-escape pipe 35 is connected to the outside, and the large diameter end of the anti-escape pipe 35 is not inserted into the conical pipe section 33. The anti-escape pipe 35 is set to be conical, which increases the rotation resistance of the wind body in the first straight pipe section 32, thereby reducing the wind speed, and at the same time, the wind speed of the semiconductor powder in the conical pipe is further reduced, and at the same time, the semiconductor powder can be prevented from escaping.

[0045] In addition, since the present application adds the jet pipe 36, the jet pipe 36 can also replace the compressor of the aeration device 20, so that air can be blown directly into the aeration device 20 through the jet pipe 36, so that the ejected gas can enter the aeration main pipe, and the semiconductor powder can flow in the aeration device 20 along with the gas ejected from the jet pipe, and escape from the aeration device 20 along with the gas, thereby entering the supernatant.

[0046] The treatment effects of the above process are shown in the following table:

[0047]

[0048]

[0049] Obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

Claims

1. A powder adding device, characterized in that: The powder adding device is connected to the aeration pipe, and the aeration pipe includes an aeration main pipe. The powder adding device is arranged on the aeration main pipe. The powder adding device includes a first straight pipe section, a tapered pipe section, and a second straight pipe section that are coaxially arranged. The first straight pipe section is fixedly connected to the small-diameter end of the tapered pipe section, one end of the second straight pipe section is fixedly connected to the large-diameter end of the tapered pipe section, and the other end of the second straight pipe section is inserted into the aeration main pipe. The first straight pipe section is located at the top, and an air inlet is provided on one side of the first straight pipe section. The air inlet is located in the tangential direction of the first straight pipe section, and the semiconductor powder is blown into the first straight pipe section through the air inlet.

2. A powder adding device according to claim 1, characterized in that: The first straight pipe section is provided with an anti-escape pipe, and the anti-escape pipe is coaxially arranged with the first straight pipe section.

3. A powder adding device according to claim 2, characterized in that: The anti-escape pipe is a tapered pipe, the small diameter end of the anti-escape pipe is fixedly connected to the first straight pipe section, and the small diameter end of the anti-escape pipe is communicated with the outside, and the large diameter end of the anti-escape pipe is not inserted into the tapered pipe section.

4. A powder adding device according to claim 3, characterized in that: The first straight pipe section is also coaxially provided with an injection pipe, one end of the injection pipe is communicated with the compressor, and the other end of the injection pipe is inserted into the second straight pipe section.

5. A powder adding device according to claim 4, characterized in that: The gas sprayed from the air jet pipe can enter the aeration main pipe, and the semiconductor powder can flow in the aeration device along with the gas sprayed from the air jet pipe, and escape from the aeration device along with the gas, thereby entering the supernatant.

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