Lithium iron phosphate dust collection device applied to new energy industry

Abstract

The utility model provides a lithium iron phosphate dust collection device applied to the new energy industry, which relates to the technical field of flue gas environment-friendly purification, and comprises a flue, a dry-process deacidification system, a bag-type dust collector and a filter, the dry-process deacidification system is connected with the front end of the flue and is used for injecting calcium hydroxide or sodium bicarbonate powder into the flue, and the bag-type dust collector is connected with the filter. A heating reactor is arranged on the flue at the rear end of the dry-process deacidification system; flue gas is introduced through the flue, calcium hydroxide or sodium bicarbonate powder is adopted as an adsorbent to be introduced into the flue gas by adopting the dry-process deacidification system, acidic substances such as hydrogen fluoride, hydrogen chloride and sulfur dioxide are efficiently removed by matching with heating of the heating reactor, then dust is collected and removed by the bag-type dust collector, and efficient filtration is performed by matching with the filter. According to the invention, synergistic removal of various pollutants is realized, the process is simple, the occupied area is small, and the treated waste gas is used for drying the dried and recycled materials, so that energy recovery is facilitated, and more energy is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental protection and purification of flue gas, and in particular to a lithium iron phosphate dust collecting device applied to the new energy industry. Background Art

[0002] Lithium iron phosphate is a lithium-ion battery electrode material with the chemical formula LiFePO4 (LFP for short). It is mainly used in various lithium-ion batteries. Since Japan's NTT first revealed the olivine-structured lithium battery positive electrode material AyMPO4 (A is an alkali metal, M is a combination of CoFe: LiFeCoPO4) in 1996, John B. Goodenough and other research groups at the University of Texas at Austin in 1997 also reported the reversible lithium migration and extraction characteristics of LiFePO4. Compared with traditional lithium-ion secondary battery positive electrode materials, spinel-structured LiMn2O4 and layered-structured LiCoO2, LiMPO4 has a wider source of raw materials, is cheaper and has no environmental pollution.

[0003] In the preparation process of lithium iron phosphate positive electrode materials in the new energy industry, various pollutants such as dust will be generated. The flue gas components are diverse, including particulate matter, sulfur dioxide, hydrogen fluoride and other species. There is currently no technical means for comprehensive management. Generally, it is only discharged through simple desulfurization means, and the energy in the flue gas is directly wasted. Therefore, the utility model proposes a lithium iron phosphate dust collection device applied to the new energy industry to solve the problems existing in the prior art. Utility Model Content

[0004] In view of the above problems, the utility model proposes a lithium iron phosphate dust collecting device applied to the new energy industry. The lithium iron phosphate dust collecting device applied to the new energy industry can collect dust, absorb acidic gases, and use the flue gas that meets the standards for the treatment of materials in the drying section, thereby achieving the purpose of energy saving and environmental protection.

[0005] To achieve the purpose of the utility model, the utility model is implemented through the following technical solutions: a lithium iron phosphate dust collecting device used in the new energy industry, comprising a flue, a dry deacidification system, a bag filter and a filter, the dry deacidification system is connected to the front end of the flue, and is used to inject calcium hydroxide or sodium bicarbonate powder into the flue, a heating reactor is provided on the flue at the rear end of the dry deacidification system, and a dust removal pipeline is connected to the flue at the rear end of the heating reactor;

[0006] The output end of the dust removal pipe is connected to a bag dust collector, and the output end of the bag dust collector is connected to a purification pipe, the output end of the purification pipe is connected to a filter, and a switching pipe is connected between the purification pipe and the flue, the output end of the flue is connected to a chimney, and the input end of the flue is connected to a furnace outlet, and the output end of the filter is connected to a drying recovery point.

[0007] A further improvement is that the dry deacidification system comprises a silo and a screw feeder, the screw feeder is arranged below the silo, the output end of the screw feeder is connected to a discharger, and the output end of the discharger is connected to a discharge pipe.

[0008] A further improvement is that the output end of the discharge pipe is connected to the flue, and one end of the discharge pipe is connected to a high-pressure fan, and both sides of the silo are provided with silo wall vibrators.

[0009] A further improvement is that a first switching valve is provided on the flue at the rear end of the connection between the dust removal pipeline and the flue, and a second switching valve is provided on the input end of the dust removal pipeline.

[0010] A further improvement is that a third switching valve is provided on the flue at the front end of the connection between the switching pipe and the flue, a fourth switching valve is provided on the switching pipe, and a fifth switching valve is provided on the purification pipe at a position between the switching pipe and the filter.

[0011] A further improvement is that a first fan is provided on the flue and is located at the front end of the switching pipe, and a second fan is provided on the purification pipe and is located at the front end of the switching pipe.

[0012] Further improvements are: a temperature sensor and a pressure sensor are provided on the dust removal pipe at the input end of the bag filter, a dust concentration meter is provided on the purification pipe at the output end of the bag filter, and a fresh air valve is provided on the flue and the dust removal pipe.

[0013] The beneficial effects of the utility model are:

[0014] 1. The utility model introduces flue gas through the flue, adopts a dry deacidification system to introduce calcium hydroxide or sodium bicarbonate powder as an adsorbent into the flue gas, and cooperates with a heating reactor for heating to efficiently remove acidic substances such as hydrogen fluoride, hydrogen chloride and sulfur dioxide. Then, a bag filter is used to collect dust, and a filter is used for efficient filtration, thereby achieving the coordinated removal of multiple pollutants. The process is simple and occupies a small area. The treated exhaust gas is used for drying materials at the dry recovery site, which is beneficial to energy recovery and more energy-saving.

[0015] 2. The utility model utilizes dust removal ducts and purification ducts to access the flue to introduce flue gas for treatment, and adds a switching duct between the purification duct and the flue, which can switch to not using bag dust collectors and filters and directly discharging into the chimney, can switch to not using filters, can switch to using bag dust collectors and filters simultaneously, and has diversified functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is the front view of the utility model;

[0017] Figure 2 It is a schematic diagram of the dry deacidification system of the utility model.

[0018] Among them: 1. Flue; 2. Bag filter; 3. Filter; 4. Heating reactor; 5. Dust removal pipeline; 6. Purification pipeline; 7. Switching pipeline; 8. Chimney; 9. Drying recovery point; 10. Furnace air outlet; 11. Silo; 12. Screw feeder; 13. Discharger; 14. Discharge pipeline; 15. High-pressure fan; 16. Silo wall vibrator; 17. First switching valve; 18. Second switching valve; 19. Third switching valve; 20. Fourth switching valve; 21. Fifth switching valve; 22. First fan; 23. Second fan; 24. Temperature sensor; 25. Pressure sensor; 26. Dust concentration meter. DETAILED DESCRIPTION

[0019] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with an embodiment. The embodiment is only used to explain the present invention and does not constitute a limitation on the protection scope of the present invention.

[0020] Embodiment 1

[0021] according to Figure 1 , 2 As shown, this embodiment proposes a lithium iron phosphate dust collecting device applied to the new energy industry, comprising a flue 1, a dry deacidification system, a bag filter 2 and a filter 3, wherein the dry deacidification system is connected to the front end of the flue 1 and is used to inject calcium hydroxide or sodium bicarbonate powder into the flue 1, and a heating reactor 4 is provided on the flue 1 at the rear end of the dry deacidification system, and a dust removal pipeline 5 is connected to the flue 1 at the rear end of the heating reactor 4;

[0022] The output end of the dust removal pipeline 5 is connected to the bag filter 2, and the output end of the bag filter 2 is connected to the purification pipeline 6, the output end of the purification pipeline 6 is connected to the filter 3, and a switching pipeline 7 is connected between the purification pipeline 6 and the flue 1, the output end of the flue 1 is connected to the chimney 8, and the input end of the flue 1 is connected to the furnace outlet 10, and the output end of the filter 3 is connected to the drying recovery 9. When in use. Flue gas is introduced through the flue 1, and a dry deacidification system is used to introduce calcium hydroxide or sodium bicarbonate powder as an adsorbent into the flue gas, and the heating reactor 4 is used for heating to efficiently remove acidic substances such as hydrogen fluoride, hydrogen chloride and sulfur dioxide. Then the bag filter 2 collects the dust, and the filter 3 is used for efficient filtration, so as to achieve the coordinated removal of multiple pollutants. The treated waste gas is used for drying the materials at the drying recovery.

[0023] The bag filter 2 is made of stainless steel, and the dust removal system is made of "zero" leakage. The operating temperature is wide, up to 260℃ or above; the system resistance is less than 600pa, which is much lower than the domestic similar products, and its operating energy consumption is low; the bag material used in the filter bag is polytetrafluoroethylene (PTFE), and it is coated with (PTFE).

[0024] Filter 3 contains 4 H14 high-efficiency filter elements, arranged in a 2×2 form. According to the design, it can meet the filtration accuracy of more than 99.99% above 0.3μm. A differential pressure transmitter is added to filter 3. When the differential pressure reaches 500Pa, the control system will issue an alarm.

[0025] The dry deacidification system includes a silo 11 and a screw feeder 12. The screw feeder 12 is arranged below the silo 11. The output end of the screw feeder 12 is connected to a discharger 13, and the output end of the discharger 13 is connected to a discharge pipe 14. The output end of the discharge pipe 14 is connected to the flue 1, and one end of the discharge pipe 14 is connected to a high-pressure fan 15. Both sides of the silo 11 are provided with a silo wall vibrator 16. The dry deacidification system, the main adsorbent is a specific high specific surface calcium hydroxide or sodium bicarbonate powder, the particle size D90 of which is 20μm-30μm, mainly and efficiently removes acidic substances such as hydrogen fluoride, hydrogen chloride and sulfur dioxide, with an efficiency of more than 95%, and a wide operating temperature range of more than 80°C. The ultrafine powder of calcium hydroxide or sodium bicarbonate is injected into the flue 1 in a certain proportion through the discharger 13 and the high-pressure blower 15. The desulfurizer is thermally activated in the heating reactor 4, and the specific surface area increases rapidly. It is fully in contact with the flue gas and chemically reacts. The acidic substances such as SO2, HCl, FH in the flue gas are absorbed. The dry deacidification process mechanism is as follows:

[0026] 2NaHCO3+SO2+1 / 2O2→Na2SO4+2CO2+H2O

[0027] 2NaHCO3+SO3→Na2SO4+2CO2+H2O

[0028] NaHCO3+HCl→NaCl+CO2+H2O

[0029] NaHCO3+HF→NaF+CO2+H2O

[0030] Or Ca(OH)2+SO2=CaSO3·1 / 2H2O+1 / 2H2O

[0031] Ca(OH)2+SO3=CaSO4·1 / 2H2O+1 / 2H2O

[0032] CaSO3·1 / 2H2O+1 / 2O2=CaSO4·1 / 2H2O

[0033] Ca(OH)2+2HCl=CaCl2·2H2O(~70℃)(strong hygroscopic material)

[0034] 2Ca(OH)2+2HCl=CaCl2·Ca(OH)2·2H2O (>120℃)

[0035] Ca(OH)2+2HF=CaF2+2H2O.

[0036] Embodiment 2

[0037] according to Figure 1 , 2 As shown, this embodiment proposes a lithium iron phosphate dust collecting device applied to the new energy industry, comprising a flue 1, a dry deacidification system, a bag filter 2 and a filter 3, wherein the dry deacidification system is connected to the front end of the flue 1 and is used to inject calcium hydroxide or sodium bicarbonate powder into the flue 1, and a heating reactor 4 is provided on the flue 1 at the rear end of the dry deacidification system, and a dust removal pipeline 5 is connected to the flue 1 at the rear end of the heating reactor 4;

[0038] The output end of the dust removal pipeline 5 is connected to the bag filter 2, and the output end of the bag filter 2 is connected to the purification pipeline 6, the output end of the purification pipeline 6 is connected to the filter 3, and a switching pipeline 7 is connected between the purification pipeline 6 and the flue 1, the output end of the flue 1 is connected to the chimney 8, and the input end of the flue 1 is connected to the furnace outlet 10, and the output end of the filter 3 is connected to the drying recovery 9. When in use. Flue gas is introduced through the flue 1, and a dry deacidification system is used to introduce calcium hydroxide or sodium bicarbonate powder as an adsorbent into the flue gas, and the heating reactor 4 is used for heating to efficiently remove acidic substances such as hydrogen fluoride, hydrogen chloride and sulfur dioxide. Then the bag filter 2 collects the dust, and the filter 3 is used for efficient filtration, so as to achieve the coordinated removal of multiple pollutants. The treated waste gas is used for drying the materials at the drying recovery.

[0039] The bag filter 2 is made of stainless steel, and the dust removal system is made of "zero" leakage. The operating temperature is wide, up to 260℃ or above; the system resistance is less than 600pa, which is much lower than the domestic similar products, and its operating energy consumption is low; the bag material used in the filter bag is polytetrafluoroethylene (PTFE), and it is coated with (PTFE).

[0040] Filter 3 contains 4 H14 high-efficiency filter elements, arranged in a 2×2 form. According to the design, it can meet the filtration accuracy of more than 99.99% above 0.3μm. A differential pressure transmitter is added to filter 3. When the differential pressure reaches 500Pa, the control system will issue an alarm.

[0041] A first switching valve 17 is provided on the flue 1 at the rear end of the connection between the dust removal pipe 5 and the flue 1, and a second switching valve 18 is provided on the input end of the dust removal pipe 5. A third switching valve 19 is provided on the flue 1 at the front end of the connection between the switching pipe 7 and the flue 1, a fourth switching valve 20 is provided on the switching pipe 7, and a fifth switching valve 21 is provided on the purification pipe 6 at the position between the switching pipe 7 and the filter 3. A first fan 22 is provided on the flue 1, and the first fan 22 is located at the front end of the switching pipe 7, and a second fan 23 is provided on the purification pipe 6, and the second fan 23 is located at the front end of the switching pipe 7. Provide power for flue gas circulation. A temperature sensor 24 and a pressure sensor 25 are provided on the dust removal pipe 5 at the input end of the bag filter 2, a dust concentration meter 26 is provided on the purification pipe 6 at the output end of the bag filter 2, and a fresh air valve 27 is provided on the flue 1 and the dust removal pipe 5. The system has automatic and manual operation functions, and each valve remains normally open in the initial state. In the automatic operation state, the system switches the valve by itself to open the bag filter 2 passage. The dust concentration meter 26 detects the dust at the bag filter 2 outlet, which is less than 5mg / m 3 When the dust at the outlet of bag filter 2 is detected to be higher than 5mg / m 3 When the system automatically switches the valve to close the entrance of the filter 3 passage, discharges directly into the chimney 8, and issues an audible and visual alarm. When the bag filter 2 needs to be repaired, the smoke is directly discharged from the existing chimney 8, and the bag filter 2 and filter 3 are directly cut out of the working system. The maintenance mode needs to be set. When the filter 3 is in the maintenance state, the filter 3 passage is closed, and the smoke is directly discharged from the chimney 8 after being filtered by the bag filter 2 (without entering the drying process). The maintenance mode needs to be set. When the smoke temperature exceeds 220°C, the system issues an audible and visual alarm; when the smoke temperature exceeds 240°C, the system issues an audible and visual alarm, and at the same time, the bag filter 2 and filter 3 are directly cut out of the working system, and the smoke is directly discharged from the chimney 8; when the pressure difference of the filter 3 reaches 500Pa, the system issues an audible and visual alarm.

[0042] The lithium iron phosphate dust collecting device used in the new energy industry introduces flue gas through the flue 1, adopts a dry deacidification system to introduce calcium hydroxide or sodium bicarbonate powder as an adsorbent into the flue gas, and cooperates with the heating reactor 4 for heating to efficiently remove acidic substances such as hydrogen fluoride, hydrogen chloride and sulfur dioxide. Then the bag filter 2 collects the dust, and cooperates with the filter 3 for efficient filtration, realizing the coordinated removal of multiple pollutants, and the process is simple and occupies a small area. The treated waste gas is used for drying the materials at the dry recovery site, which is conducive to energy recovery and more energy-saving. In addition, this product uses the dust removal pipeline 5 and the purification pipeline 6 to access the flue 1 to introduce the flue gas for treatment, and a switching pipeline 7 is added between the purification pipeline 6 and the flue 1, which can switch to not use the bag filter 2 and the filter 3 and directly discharge the chimney 8, can switch to not use the filter 3, can switch to the bag filter 2 and the filter 3 for simultaneous use, and has diversified functions.

[0043] The above shows and describes the basic principles, 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 for explaining the principles of 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 claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A lithium iron phosphate dust collecting device used in the new energy industry, comprising a flue (1), a dry deacidification system, a bag filter (2) and a filter (3), characterized in that: The dry deacidification system is connected to the front end of the flue (1) and is used to inject calcium hydroxide or sodium bicarbonate powder into the flue (1); a heating reactor (4) is provided on the flue (1) at the rear end of the dry deacidification system, and a dust removal pipeline (5) is connected to the flue (1) at the rear end of the heating reactor (4); The output end of the dust removal pipe (5) is connected to the bag filter (2), and the output end of the bag filter (2) is connected to a purification pipe (6), the output end of the purification pipe (6) is connected to a filter (3), and a switching pipe (7) is connected between the purification pipe (6) and the flue (1), the output end of the flue (1) is connected to a chimney (8), and the input end of the flue (1) is connected to a furnace air outlet (10), and the output end of the filter (3) is connected to a drying recovery point (9).

2. According to claim 1, a lithium iron phosphate dust collecting device used in the new energy industry is characterized in that: The dry deacidification system comprises a silo (11) and a screw feeder (12), wherein the screw feeder (12) is arranged below the silo (11), the output end of the screw feeder (12) is connected to a discharger (13), and the output end of the discharger (13) is connected to a discharge pipe (14).

3. A lithium iron phosphate dust collecting device used in the new energy industry according to claim 2, characterized in that: The output end of the discharge pipe (14) is connected to the flue (1), and one end of the discharge pipe (14) is connected to a high-pressure fan (15), and both sides of the silo (11) are provided with silo wall vibrators (16).

4. The lithium iron phosphate dust collecting device used in the new energy industry according to claim 1, characterized in that: A first switching valve (17) is provided on the flue (1) at the rear end of the connection between the dust removal pipe (5) and the flue (1), and a second switching valve (18) is provided on the input end of the dust removal pipe (5).

5. The lithium iron phosphate dust collecting device used in the new energy industry according to claim 4, characterized in that: A third switching valve (19) is provided on the flue (1) at the front end of the connection between the switching pipe (7) and the flue (1), a fourth switching valve (20) is provided on the switching pipe (7), and a fifth switching valve (21) is provided on the purification pipe (6) at a position between the switching pipe (7) and the filter (3).

6. The lithium iron phosphate dust collecting device used in the new energy industry according to claim 5, characterized in that: The flue (1) is provided with a first fan (22), and the first fan (22) is located at the front end of the switching pipe (7); the purification pipe (6) is provided with a second fan (23), and the second fan (23) is located at the front end of the switching pipe (7).

7. The lithium iron phosphate dust collecting device used in the new energy industry according to claim 6, characterized in that: A temperature sensor (24) and a pressure sensor (25) are provided on the dust removal pipe (5) at the input end of the bag filter (2), a dust concentration meter (26) is provided on the purification pipe (6) at the output end of the bag filter (2), and a fresh air valve (27) is provided on the flue (1) and the dust removal pipe (5).

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