A VOC waste gas purification device for waste battery positive electrode recovery rotary kiln tail gas treatment

Abstract

The utility model relates to the technical field of waste gas purification, specifically a VOC waste gas purification device for waste battery positive electrode recovery rotary kiln tail gas treatment, comprising: a smoke collecting main pipe; one side of the smoke collecting main pipe is connected with a flame arrester, one side of the flame arrester is connected with a bag dust collector, one side of the bag dust collector is connected with a combustion fan, one side of the combustion fan is connected with a heat exchanger through a pipeline, an explosion-proof plate is arranged in the pipeline, one end of the heat exchanger is fixedly connected with a TO furnace, a combustion chamber is arranged inside the TO furnace, one side of the T furnace is connected with a first alkali liquid washing tower, dust particles in dust-containing flue gas are filtered out when passing through the bag dust collector, and the clean flue gas enters the TO combustion device to avoid dust particles from burning to produce toxic gases, and a large amount of harmful organic waste gas in the waste battery positive electrode tail gas is burned by the TO furnace by using fuel gas to generate H2O and CO2, so that the harmful waste gas treatment efficiency is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas purification, in particular to a VOC waste gas purification device for waste battery positive electrode recovery rotary kiln tail gas treatment. Background Art

[0002] Flue gas purification mainly refers to the work of treating industrial waste gas such as dust particles, flue gas, odorous gas, and toxic and harmful gas generated in industrial places. Common waste gas purification includes factory dust waste gas purification, workshop dust waste gas purification, organic waste gas purification, waste gas odor purification, acid and alkali waste gas purification, chemical waste gas purification, etc. The treatment of waste gas should be carried out from two aspects: one is the waste gas dust removal for suspended particulate pollutants; the other is the waste gas purification for gaseous pollutants. The control of gaseous pollutants mainly uses the physical and chemical properties, such as solubility, adsorption saturation, dew point and selective chemical reaction, to separate pollutants from waste gas; or convert pollutants into harmless or easy-to-handle substances. The basic methods of waste gas purification include absorption, adsorption, condensation, catalytic conversion and combustion. Overview of air pollution control technology Air pollution control technology is an important countermeasure for atmospheric environmental protection. Clean combustion technology is a general term for all technologies such as processing, combustion, conversion and pollution emission control to reduce pollutant emissions and improve fuel utilization efficiency during the combustion process. Sulfur dioxide, nitrogen oxides and smoke (dust) are the main air pollutants in my country. Reducing the emission of sulfur dioxide, nitrogen oxides and smoke (dust) is not only very important for protecting and improving the atmospheric environment. It is also very urgent. Therefore, the following is an overview of the control technology of sulfur dioxide, nitrogen oxides and smoke (dust). With the rapid development of the new energy battery industry, the positive electrodes of used batteries need to be recycled and processed in large quantities. After being processed, they are recycled. The positive electrodes of used batteries produce a large amount of organic (inorganic) waste gas after the rotary kiln, which pollutes the environment and must be pressurized to protect the environment.

[0003] After searching, the Chinese patent publication number CN110227312B discloses a method for using an exhaust gas purification device, which includes contacting oil fume exhaust gas with an exhaust gas purifier, wherein the exhaust gas purifier includes the following raw materials: sodium dodecylbenzene sulfonate, nonylphenol polyoxyethylene ether, isopropyl alcohol, triethanolamine, sodium silicate, citric acid, polyether modified silicone oil, modified kapok fiber, nano-alumina, and water; the mass ratio of the polyether modified silicone oil, modified kapok fiber, and nano-alumina is (2-4): (5-10): (1-3); the modified kapok fiber is obtained by modifying the kapok fiber by treating the kapok fiber with hydrogen peroxide; and the surface tension of the exhaust gas purifier is 18-32 dynes / cm. The above patent has the following shortcomings: Although the patent can purify oil smoke, it cannot purify the large amount of organic (inorganic) waste gas generated by the waste battery positive electrode after the rotary kiln. According to national standards, the waste gas needs to be ≤20mg / Nm3 after treatment, otherwise it will cause serious environmental pollution. In view of this, we propose a VOC waste gas purification device for waste battery positive electrode recovery rotary kiln tail gas treatment. Utility Model Content

[0004] The utility model aims to provide a VOC waste gas purification device for waste battery positive electrode recovery rotary kiln tail gas treatment to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A VOC waste gas purification device for waste battery positive electrode recovery rotary kiln tail gas treatment, comprising: a smoke collecting main pipe;

[0007] One side of the smoke collecting main pipe is connected to a flame arrester, one side of the flame arrester is connected to a bag dust collector, one side of the bag dust collector is connected to a combustion fan, one side of the combustion fan is connected to a heat exchanger through a pipeline, an explosion-proof plate is arranged in the pipeline, one end of the heat exchanger is fixedly connected to a TO furnace, a combustion chamber is arranged inside the TO furnace, one side of the T furnace is connected to a first alkali liquid washing tower, one side of the first alkali liquid washing tower is connected to a second alkali liquid washing tower, the bottoms of the first alkali liquid washing tower and the second alkali liquid washing tower are connected to a slurry external sewage treatment system, a steam-water separator is arranged inside the second alkali liquid washing tower, one side of the second alkali liquid washing tower is connected to a main induced draft fan, and one side of the main induced draft fan is connected to a chimney.

[0008] Preferably, a method for using a VOC waste gas purification device for waste battery positive electrode recovery rotary kiln tail gas treatment comprises the following steps:

[0009] S1, air intake: the waste gas from the positive electrode rotary kiln of used batteries is introduced into the smoke collecting main pipe;

[0010] S2. Dust removal: The waste gas from the positive electrode rotary kiln of used batteries is passed from the smoke collecting main pipe through the flame arrester into the bag filter for dust removal to obtain the dust-removed waste gas;

[0011] S3. Heat recovery:

[0012] S301, heat exchange: the exhaust gas after dust removal is passed into the pipe with explosion-proof disk through the combustion fan, and then enters the heat exchanger through the pipe with explosion-proof disk to recover heat;

[0013] S301, combustion: the exhaust gas after dust removal is passed into the combustion chamber in the TO furnace, and the harmful organic substances therein are burned and purified by the TO furnace to obtain the exhaust gas after combustion;

[0014] S4. Purification:

[0015] S401, first purification: the exhaust gas after combustion is passed through the induced draft fan into the first alkali solution washing tower for purification, and the sewage generated during the purification process is discharged into the slurry external sewage treatment system through a pump;

[0016] S402, second purification: the exhaust gas after combustion is passed through the induced draft fan into the steam-water separator in the second alkali solution washing tower for purification to obtain purified flue gas, and the sewage generated during the purification process is discharged into the slurry external sewage treatment system through a pump;

[0017] S5. Inspection: Collect the purified flue gas and send it to the laboratory for inspection;

[0018] S6. Emission: The purified flue gas is discharged directly into the atmosphere through the main induced draft fan from the top chimney.

[0019] Preferably, the shell of the flame arrester is made of cast aluminum alloy, and the content of cast iron and magnesium is not more than 0.5%, and the fire barrier layer core and core pressure ring of the flame arrester are made of stainless steel.

[0020] Preferably, the filter bag of the bag-type dust collector is made of woven filter cloth or non-woven felt, and the dust in the exhaust gas of the waste battery positive electrode rotary kiln is filtered by the filtering effect of the fiber fabric. When the dust-containing flue gas passes through the bag-type dust collector, the dust particles in the flue gas are filtered out, and the clean flue gas enters the TO combustion device.

[0021] Preferably, the heat exchanger is of shell-and-tube type, with a tube wall thickness of 1 mm and a maximum heat exchange efficiency of 14000 w / m 2 .k.

[0022] Preferably, the TO furnace is a direct-fired TO waste liquid incinerator with an incineration efficiency of 50-20000 kg / h. Through the TO furnace incineration process, a large amount of harmful organic waste gas in the positive electrode tail gas of the waste battery is burned in the TO furnace using fuel gas to generate H2O and CO2, which are then sent to the alkali washing tower for further purification.

[0023] Preferably, the first alkali solution washing tower and the second alkali solution washing tower are glass fiber reinforced plastic alkali washing towers, which are used to absorb sulfides, nitrogen oxides and particulate matter in the flue gas;

[0024] Desulfurization process:

[0025] SO2+NaClO2 (live)+2H2O=2H2SO4+NaCl

[0026] H2SO4+2CaOH=Ca2SO4+2H2O

[0027] Denitrification process:

[0028] 4NO+3NaClO2(live)+2H2O=4HNO3+3NaClCaOH+HNO3=CaNO3+H2O.

[0029] Preferably, the steam-water separator is of cyclone type, made of stainless steel, and has a plurality of fins for generating high-speed cyclones installed inside.

[0030] Compared with the prior art, the beneficial effects of the utility model are:

[0031] 1. The dust particles in the dust-containing flue gas are filtered out when passing through the bag filter, and the clean flue gas enters the TO combustion device to avoid the combustion of dust particles to produce toxic gases. The large amount of harmful organic waste gas in the positive tail gas of the waste battery is burned in the TO furnace using fuel gas to generate H2O and CO2, thereby increasing the treatment efficiency of harmful waste gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a flow chart of the utility model.

[0033] In the figure: 1. Smoke collecting main pipe; 2. Flame arrester; 3. Bag filter; 4. Combustion fan; 5. Explosion-proof plate; 6. Heat exchanger; 7. Combustion chamber; 8. TO furnace; 9. First alkali solution washing tower; 10. Slurry external sewage treatment system; 11. Second alkali solution washing tower; 12. Steam-water separator; 13. Main induced draft fan; 14. Chimney. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in 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.

[0035] In the description of this patent, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0036] In the description of this patent, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be fixedly connected or set, or it can be detachably connected or set, or connected or set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0038] Embodiment 1

[0039] like Figure 1 As shown, a VOC waste gas purification device for waste battery positive electrode recovery rotary kiln tail gas treatment includes: a smoke collecting main pipe 1;

[0040] A flame arrester 2 is connected to one side of the smoke collecting main pipe 1, a bag dust collector 3 is connected to one side of the flame arrester 2, a combustion fan 4 is connected to one side of the bag dust collector 3, a heat exchanger 6 is connected to one side of the combustion fan 4 through a pipeline, an explosion-proof plate 5 is arranged in the pipeline, a TO furnace 8 is fixedly connected to one end of the heat exchanger 6, a combustion chamber 7 is arranged inside the TO furnace 8, a first alkali liquid washing tower 9 is connected to one side of the TO furnace 8, a second alkali liquid washing tower 11 is connected to one side of the first alkali liquid washing tower 9, a slurry external sewage treatment system 10 is connected to the bottom of the first alkali liquid washing tower 9 and the second alkali liquid washing tower 11, a steam-water separator 12 is arranged inside the second alkali liquid washing tower 11, a main induced draft fan 13 is connected to one side of the second alkali liquid washing tower 11, and a chimney 14 is connected to one side of the main induced draft fan 13.

[0041] The shell of the flame arrester 2 is made of cast aluminum alloy, and the content of cast iron and magnesium is not more than 0.5%. The fire-blocking layer core and the core pressure ring of the flame arrester 2 are made of stainless steel.

[0042] The filter bag of the bag filter 3 is made of woven filter cloth or non-woven felt. The dust in the exhaust gas of the waste battery positive electrode rotary kiln is filtered by the filtering effect of the fiber fabric. When the dust-containing flue gas passes through the bag filter, the dust particles in the flue gas are filtered out, and the clean flue gas enters the TO combustion device.

[0043] Heat exchanger 6 is a shell-and-tube type with a tube wall thickness of 1 mm and a maximum heat exchange efficiency of 14000 w / m 2 .k.

[0044] Preferably, the TO furnace 8 is a direct-fired TO waste liquid incinerator with an incineration efficiency of 50-20000 kg / h. Through the incineration process in the TO furnace 8, a large amount of harmful organic waste gas in the positive electrode tail gas of the waste battery is burned by gas through the TO furnace 8 to generate H2O and CO2, which are then sent to the alkali washing tower for further purification.

[0045] The first alkali solution washing tower 9 and the second alkali solution washing tower 11 are glass fiber reinforced plastic alkali washing towers, which are used to absorb sulfides, nitrogen oxides and particulate matter in the flue gas;

[0046] Desulfurization process:

[0047] SO2+NaClO2 (live)+2H2O=2H2SO4+NaCl

[0048] H2SO4+2CaOH=Ca2SO4+2H2O

[0049] Denitrification process:

[0050] 4NO+3NaClO2(live)+2H2O=4HNO3+3NaClCaOH+HNO3=CaNO3+H2O.

[0051] The steam-water separator 12 is of a steam cyclone type, made of stainless steel, and has a plurality of fins for generating high-speed cyclones installed therein.

[0052] Embodiment 2

[0053] A method for using a VOC waste gas purification device for waste battery positive electrode recovery rotary kiln tail gas treatment, comprising the following steps:

[0054] S1, air intake: the waste gas from the positive electrode rotary kiln of used batteries is introduced into the smoke collecting main pipe 1;

[0055] S2, dust removal: the waste gas from the waste battery positive electrode rotary kiln is passed from the smoke collecting main pipe 1 through the flame arrester 2 into the bag filter 3 for dust removal to obtain the dust-removed waste gas;

[0056] S3. Heat recovery:

[0057] S301, heat exchange: the exhaust gas after dust removal is passed into the pipeline provided with explosion-proof disc 5 through the combustion fan 4, and then enters the heat exchanger 6 through the pipeline provided with explosion-proof disc 5 to recover heat;

[0058] S301, combustion: the dedusted waste gas is passed into the combustion chamber 7 in the TO furnace 8, and the harmful organic substances therein are burned and purified by the TO furnace 8 to obtain the burned waste gas;

[0059] S4. Purification:

[0060] S401, first purification: the exhaust gas after combustion is passed through the induced draft fan into the first alkali solution washing tower 9 for purification, and the sewage generated during the purification process is discharged into the slurry external sewage treatment system 10 through a pump;

[0061] S402, second purification: the exhaust gas after combustion is passed through the induced draft fan into the steam-water separator 12 in the second alkali solution washing tower 11 for purification to obtain purified flue gas, and the sewage generated during the purification process is discharged into the slurry external sewage treatment system 10 through a pump;

[0062] S5. Inspection: Collect the purified flue gas and send it to the laboratory for inspection;

[0063] S6. Discharge: The purified flue gas is discharged directly into the atmosphere through the main induced draft fan 13 and the top chimney 14.

[0064] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A VOC waste gas purification device for waste battery positive electrode recovery rotary kiln tail gas treatment, characterized in that: include: A smoke collecting main pipe (1), a TO furnace (8), and a first alkali solution washing tower (9); One side of the smoke collecting main pipe (1) is connected to a flame arrester (2), one side of the flame arrester (2) is connected to a bag dust collector (3), one side of the bag dust collector (3) is connected to a combustion fan (4), one side of the combustion fan (4) is connected to a heat exchanger (6) via a pipeline, an explosion-proof plate (5) is provided in the pipeline, one end of the heat exchanger (6) is fixedly connected to a TO furnace (8), a combustion chamber (7) is provided inside the TO furnace (8), and one side of the TO furnace (8) is connected to A first alkali liquid washing tower (9) is provided, one side of the first alkali liquid washing tower (9) is connected to a second alkali liquid washing tower (11), the bottoms of the first alkali liquid washing tower (9) and the second alkali liquid washing tower (11) are connected to a slurry external sewage treatment system (10), a steam-water separator (12) is arranged inside the second alkali liquid washing tower (11), one side of the second alkali liquid washing tower (11) is connected to a main induced draft fan (13), and one side of the main induced draft fan (13) is connected to a chimney (14).

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