Wet flue gas purification and substance recovery device and method for kiln

Abstract

The device comprises a bottom plate, the top of the bottom plate is fixedly connected with a placement table through a support, the left end of the top of the placement table is fixedly connected with a spraying tower, the top of an inner cavity of the spraying tower is fixedly connected with a spraying head through a support, and the spraying head is fixedly connected with a spraying head through a support. A first pump machine is fixedly connected to the top of the spraying tower, an air inlet pipe is arranged on the left side of an inner cavity of the spraying tower, a water tank is fixedly connected to the middle end of the top of the placing table, a curved pipe is fixedly connected to an inner cavity of the water tank through a support, and a liquid level sensor is fixedly connected to the top of the inner cavity of the water tank; and the bottom of the inner cavity of the water tank is fixedly connected with a water temperature detector. According to the invention, full gas-liquid contact is realized through the combination of the spray tower and the spray head, and a dual purification path of'wet absorption and adsorption filtration 'is formed in cooperation with the activated carbon filter screen of the purification box, so that the pollutant removal efficiency is remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of kiln wet flue gas purification, and in particular to a kiln wet flue gas purification and material recovery device and method. Background Art

[0002] Industrial kilns, especially cement kilns that use alternative fuels or co-process waste, often face adverse effects on stable kiln operation because the alternative fuels or waste contain higher levels of potassium, sodium, and chlorine than the original fuel. A common problem is the blockage of the furnace walls and channels caused by crusting in high-temperature environments, which reduces the channel cross-sectional area, increases operating energy consumption, and increases the failure rate. However, current kiln wet flue gas purification and material recovery devices mostly use a single spray process, which is difficult to handle the complex composition of kiln flue gas. At the same time, the flue gas carrying heat after spraying is not effectively utilized, resulting in energy waste. In addition, the waste liquid generated by the spraying is usually directly discharged or simply neutralized, and the soluble salts and trace valuable substances contained in it are not recovered, which not only wastes resources but also may cause secondary pollution. To this end, we propose a kiln wet flue gas purification and material recovery device and method. Summary of the Invention

[0003] The purpose of the present invention is to provide a kiln wet flue gas purification and material recovery device and method, which has the advantages of flue gas purification, waste heat recovery, waste liquid treatment and resource recovery. It solves the problem that current kiln wet flue gas purification and material recovery devices mostly use a single spraying process, which is difficult to cope with kiln flue gas with complex components. At the same time, the flue gas carrying heat after spraying is not effectively utilized, resulting in energy waste. In addition, the waste liquid generated by spraying is usually directly discharged or simply neutralized, and the soluble salts and trace valuable substances contained therein are not recovered, which not only causes resource waste, but may also cause secondary pollution.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a kiln wet flue gas purification and material recovery device, comprising a base plate, the base plate, the top of the base plate is fixedly connected to a placing table through a bracket, the left end of the top of the placing table is fixedly connected to a spray tower, the top of the inner cavity of the spray tower is fixedly connected to a spray head through a bracket, the top of the spray tower is fixedly connected to a first pump, an air intake pipe is provided on the left side of the inner cavity of the spray tower, the middle end of the top of the placing table is fixedly connected to a water tank, the inner cavity of the water tank is fixedly connected to a curved pipe through a bracket, the top of the inner cavity of the water tank is fixedly connected to a liquid level sensor, the bottom of the inner cavity of the water tank is fixedly connected to a water temperature detector, the top of the water tank is fixedly connected to a purification box, the inner cavity of the purification box is provided with an activated carbon filter, and the top of the purification box is provided with an exhaust port.

[0005] Preferably, the left end of the top of the bottom plate is fixedly connected to a box body, the left end of the inner cavity of the box body is provided with a sedimentation tank, the top of the inner cavity of the sedimentation tank is fixedly connected with a short tube, the other end of the short tube is fixedly connected to the bottom of the inner cavity of the spray tower, a first filter tank is provided at the upper right end of the inner cavity of the box body, the inner cavity of the first filter tank is provided with a microfiltration membrane and a nanofiltration membrane from left to right, a second filter tank is provided at the lower right end of the inner cavity of the box body, the inner cavity of the second filter tank is installed with a reverse osmosis membrane, an inlet is provided between the second filter tank and the lower part of the right end of the inner cavity of the first filter tank, and an evaporation crystallizer is installed at the right end of the top of the placement table.

[0006] Preferably, a second pump is fixedly connected to the right side of the evaporation crystallizer, the water intake of the second pump is fixedly connected to the bottom of the right side of the inner cavity of the second filter tank through a pipe, the water outlet of the second pump is fixedly connected to the water inlet of the evaporation crystallizer through a pipe, and the air outlet of the evaporation crystallizer is connected to the back of the spray tower through a pipe.

[0007] Preferably, a diversion port is provided between the left side of the inner cavity of the first filter tank and the right side of the inner cavity of the sedimentation tank, and a solenoid valve is installed in the inner cavity of the diversion port.

[0008] Preferably, the water suction port of the first pump is fixedly connected to the external sodium hydroxide solution tank through a pipeline, and the water outlet of the first pump is fixedly connected to the sprinkler head through a pipeline.

[0009] Preferably, the water inlet of the curved tube is fixedly connected to the air outlet of the spray tower through a pipeline, and the outlet of the curved tube extends to the lower end of the bottom of the inner cavity of the purification box.

[0010] Preferably, a drain outlet is provided at the lower part of the front face of the water tank, a valve is installed in the inner cavity of the drain outlet, a display is fixedly connected to the left end of the front face of the water tank, the input end of the display is electrically connected to the output end of the liquid level sensor and the water temperature detector, and a PLC controller is fixedly connected to the right end of the front face of the water tank, the output end of the PLC controller is electrically connected to the input end of the first pump, the evaporator crystallizer, the second pump and the solenoid valve.

[0011] Preferably, a tool box is fixedly connected to the top of the base plate, a partition is fixedly connected to the inner cavity of the tool box, a battery box is fixedly connected to the right end of the top of the base plate, and a battery is fixedly connected to the inner cavity of the battery box.

[0012] A kiln wet flue gas purification and material recovery method comprises the following steps: The kiln flue gas enters the inner cavity from the left side of the spray tower through the air inlet pipe. The first pump transports the alkaline solution in the external sodium hydroxide solution tank to the spray head, and sprays it downward in the form of mist. The flue gas and the spray liquid are in countercurrent contact in the spray tower. The acidic pollutants are absorbed by the solution, and the particulate matter is captured by inertial collision and interception. The purified flue gas is discharged from the top of the spray tower and enters the subsequent treatment link. The flue gas after spraying carries the residual heat into the curved pipe, which is immersed in the water body of the water tank. When the flue gas flows in the curved pipe, the heat is transferred to the water in the water tank through the pipe wall, realizing the cooling of the flue gas and the heating of the water body. The water temperature detector monitors the water temperature in real time. The heated water can be discharged through the drain for other process links. The cooled flue gas is discharged from the curved pipe outlet Entering the purification box, the cooled flue gas enters from the bottom of the purification box, and is adsorbed by the activated carbon filter to remove residual organic matter, heavy metals and odors. Finally, the clean flue gas is discharged from the exhaust port in compliance with the standards. The waste liquid at the bottom of the spray tower flows into the sedimentation tank of the box through a short pipe. After static sedimentation, the upper clear liquid is controlled by the solenoid valve at the diversion port and enters the first filter tank. The clear liquid first passes through the microfiltration membrane to intercept large particles of impurities, and then passes through the nanofiltration membrane to separate the divalent ions. It then enters the second filter tank through the inlet, and the monovalent ions are further concentrated by the reverse osmosis membrane. The concentrated waste liquid is transported to the evaporation crystallizer by the second pump, and solid crystals (such as sodium salt) are separated by evaporation. The gas generated by evaporation returns to the spray tower through the pipeline to participate in purification again, and the condensed water is recycled.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention achieves full contact between gas and liquid through the combination of a spray tower and a spray head, and cooperates with the activated carbon filter of the purification box to form a dual purification path of "wet absorption + adsorption filtration", which significantly improves the efficiency of pollutant removal.

[0014] 2. The present invention converts flue gas waste heat into usable thermal energy through the heat exchange structure of the curved tube and the water tank, thereby reducing energy waste and lowering the load of subsequent flue gas treatment.

[0015] 3. The present invention forms a multi-stage filtration system through the microfiltration membrane, nanofiltration membrane and reverse osmosis membrane in the box, which realizes the gradual separation of impurities in the waste liquid. The evaporation crystallizer further recovers soluble salts, forming a resource circulation chain of "purification-filtration-crystallization". BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 This is a rear view structural diagram of the present invention; Figure 3 This is a schematic diagram of the main cross-sectional structure of the placement table of the present invention; Figure 4 This is a schematic diagram of the internal structure of the box of the present invention; Figure 5 Schematic diagram of the internal structure of the toolbox of the present invention.

[0017] In the figure: bottom plate 1, battery box 2, tool box 3, drain outlet 4, placement table 5, spray tower 6, air inlet pipe 7, first pump 8, water tank 9, purification box 10, exhaust port 11, evaporation crystallizer 12, PLC controller 13, display 14, inlet 15, second pump 16, spray head 17, activated carbon filter 18, diversion port 19, reverse osmosis membrane 20, second filter tank 21, liquid level sensor 22, water temperature detector 23, curved pipe 24, sedimentation tank 25, short pipe 26, solenoid valve 27, first filter tank 28, nanofiltration membrane 29, microfiltration membrane 30, partition 31, box body 32. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments 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.

[0019] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive of other embodiments.

[0020] See also Figure 1-5As shown, the present invention provides a kiln wet flue gas purification and material recovery device, including a bottom plate 1, a bottom plate 1, a placing table 5 is fixedly connected to the top of the bottom plate 1 through a bracket, a spray tower 6 is fixedly connected to the left end of the top of the placing table 5, a spray head 17 is fixedly connected to the top of the spray tower 6 through a bracket, a first pump 8 is fixedly connected to the top of the spray tower 6, an air inlet pipe 7 is provided on the left side of the inner cavity of the spray tower 6, a water tank 9 is fixedly connected to the middle end of the top of the placing table 5, a curved pipe 24 is fixedly connected to the inner cavity of the water tank 9 through a bracket, a liquid level sensor 22 is fixedly connected to the top of the inner cavity of the water tank 9, a water temperature detector 23 is fixedly connected to the bottom of the inner cavity of the water tank 9, a purification box 10 is fixedly connected to the top of the water tank 9, and an active A carbon filter 18 is provided, an exhaust port 11 is provided on the top of the purification box 10, a box body 32 is fixedly connected to the left end of the top of the bottom plate 1, a sedimentation tank 25 is provided at the left end of the inner cavity of the box body 32, a short tube 26 is fixedly connected to the top of the inner cavity of the sedimentation tank 25, and the other end of the short tube 26 is fixedly connected to the bottom of the inner cavity of the spray tower 6, a first filter tank 28 is provided at the upper right end of the inner cavity of the box body 32, and a microfiltration membrane 30 and a nanofiltration membrane 29 are provided in the inner cavity of the first filter tank 28 from left to right, a second filter tank 21 is provided at the lower right end of the inner cavity of the box body 32, a reverse osmosis membrane 20 is installed in the inner cavity of the second filter tank 21, an inlet 15 is provided between the second filter tank 21 and the lower part of the right end of the inner cavity of the first filter tank 28, and an evaporation crystallization device is installed at the right end of the top of the placement table 5. 12, the right side of the evaporation crystallizer 12 is fixedly connected to the second pump 16, the water suction port of the second pump 16 is fixedly connected to the bottom of the right side of the inner cavity of the second filter tank 21 through a pipe, the water outlet of the second pump 16 is fixedly connected to the water inlet of the evaporation crystallizer 12 through a pipe, the air outlet of the evaporation crystallizer 12 is communicated with the back of the spray tower 6 through a pipe, a diversion port 19 is provided between the left side of the inner cavity of the first filter tank 28 and the right side of the inner cavity of the precipitation tank 25, the inner cavity of the diversion port 19 is equipped with a solenoid valve 27, the water suction port of the first pump 8 is fixedly connected to the external sodium hydroxide solution tank through a pipe, the water outlet of the first pump 8 is fixedly connected to the spray head 17 through a pipe, and the water inlet of the curved pipe 24 is fixedly connected to the air outlet of the spray tower 6 through a pipe. Then, the outlet of the curved tube 24 extends to the lower end of the bottom of the inner cavity of the purification box 10, a drain port 4 is opened at the lower part of the front of the water tank 9, and a valve is installed in the inner cavity of the drain port 4. The left end of the front of the water tank 9 is fixedly connected to a display 14, and the input end of the display 14 is electrically connected to the output end of the liquid level sensor 22 and the water temperature detector 23. The right end of the front of the water tank 9 is fixedly connected to a PLC controller 13, and the output end of the PLC controller 13 is electrically connected to the input end of the first pump 8, the evaporation crystallizer 12, the second pump 16 and the solenoid valve 27. The top of the base plate 1 is fixedly connected to a tool box 3, and the inner cavity of the tool box 3 is fixedly connected to a partition 31. The right end of the top of the base plate 1 is fixedly connected to a battery box 2, and the inner cavity of the battery box 2 is fixedly connected to a battery.

[0021] A kiln wet flue gas purification and material recovery method comprises the following steps: The kiln flue gas enters the inner cavity from the left side of the spray tower 6 through the air inlet pipe 7. The first pump 8 transports the alkaline solution in the external sodium hydroxide solution tank to the spray head 17, and sprays downward in the form of mist. The flue gas and the spray liquid are in countercurrent contact in the spray tower 6. The acidic pollutants are absorbed by the solution, and the particulate matter is captured by inertial collision and interception. The purified flue gas is discharged from the top of the spray tower 6 and enters the subsequent treatment link. The flue gas after spraying carries the residual heat into the curved pipe 24, which is immersed in the water body of the water tank 9. When the flue gas flows in the curved pipe 24, the heat is conducted to the water in the water tank 9 through the pipe wall, realizing the cooling of the flue gas and the heating of the water body. The water temperature detector 23 monitors the water temperature in real time. The heated water can be discharged through the drain port 4 for other process links. The cooled flue gas enters the purification box 10 from the outlet of the curved pipe 24, and the cooling The heated flue gas enters the bottom of the purification box 10 and passes through the activated carbon filter 18 to absorb residual organic matter, heavy metals and odor. Finally, the clean flue gas is discharged from the exhaust port 11 in compliance with the standards. The waste liquid at the bottom of the spray tower 6 flows into the sedimentation tank 25 of the box body 32 through the short pipe 26. After static sedimentation, the upper clear liquid is controlled by the solenoid valve 27 of the diversion port 19 and enters the first filter tank 28. The clear liquid first passes through the microfiltration membrane 30 to intercept large particles of impurities, and then passes through the nanofiltration membrane 29 to separate divalent ions. It then enters the second filter tank 21 through the inlet 15, and the monovalent ions are further concentrated by the reverse osmosis membrane 20. The concentrated waste liquid is transported to the evaporation crystallizer 12 by the second pump 16, and solid crystals (such as sodium salts) are separated by evaporation. The gas generated by evaporation returns to the spray tower 6 through the pipeline to participate in purification again, and the condensed water is recycled.

[0022] It is important to note that the construction and arrangement of the present application, as illustrated in various exemplary embodiments, are illustrative only. Although only a few embodiments are described in detail in this disclosure, those reading this disclosure will readily appreciate that numerous modifications are possible (e.g., variations in the size, dimensions, structure, shape, and proportions of various components, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without materially departing from the novel teachings and advantages of the subject matter described herein. For example, components shown as integrally formed may be constructed from multiple parts or components, the positions of components may be inverted or otherwise altered, and the nature, number, or position of discrete components may be modified or changed. All such modifications are therefore intended to be encompassed within the scope of this invention. The order or sequence of any process or method steps may be altered or resequenced according to alternative embodiments. In the claims, any "means-plus-function" clause is intended to cover structures described herein that perform the recited function, and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes, and omissions may be made in the design, operating conditions, and arrangement of the exemplary embodiments without departing from the scope of this invention. Therefore, the invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0023] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment may not be described (i.e., those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention).

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A kiln wet flue gas purification and material recovery device, comprising a bottom plate (1), characterized in that: The bottom plate (1) is fixedly connected to a placing table (5) at the top of the bottom plate (1) through a bracket, the left end of the top of the placing table (5) is fixedly connected to a spray tower (6), the top of the inner cavity of the spray tower (6) is fixedly connected to a spray head (17) through a bracket, the top of the spray tower (6) is fixedly connected to a first pump (8), the left side of the inner cavity of the spray tower (6) is provided with an air inlet pipe (7), the middle end of the top of the placing table (5) is fixedly connected to a water tank (9), the inner cavity of the water tank (9) is fixedly connected to a curved pipe (24) through a bracket, the top of the inner cavity of the water tank (9) is fixedly connected to a liquid level sensor (22), the bottom of the inner cavity of the water tank (9) is fixedly connected to a water temperature detector (23), the top of the water tank (9) is fixedly connected to a purification box (10), the inner cavity of the purification box (10) is provided with an activated carbon filter (18), and the top of the purification box (10) is provided with an exhaust port (11).

2. The kiln wet flue gas purification and material recovery device according to claim 1, characterized in that: The left end of the top of the bottom plate (1) is fixedly connected to a box body (32), the left end of the inner cavity of the box body (32) is provided with a sedimentation tank (25), the top of the inner cavity of the sedimentation tank (25) is fixedly connected with a short tube (26), the other end of the short tube (26) is fixedly connected to the bottom of the inner cavity of the spray tower (6), the upper right end of the inner cavity of the box body (32) is provided with a first filter tank (28), the inner cavity of the first filter tank (28) is provided with a microfiltration membrane (30) and a nanofiltration membrane (29) from left to right, the lower right end of the inner cavity of the box body (32) is provided with a second filter tank (21), the inner cavity of the second filter tank (21) is provided with a reverse osmosis membrane (20), an inlet (15) is provided between the lower part of the right end of the inner cavity of the second filter tank (21) and the first filter tank (28), and the right end of the top of the placement table (5) is provided with an evaporation crystallizer (12).

3. The kiln wet flue gas purification and material recovery device according to claim 2, characterized in that: A second pump (16) is fixedly connected to the right side of the evaporation crystallizer (12); a water inlet of the second pump (16) is fixedly connected to the bottom of the right side of the inner cavity of the second filter tank (21) through a pipeline; a water outlet of the second pump (16) is fixedly connected to the water inlet of the evaporation crystallizer (12) through a pipeline; and an air outlet of the evaporation crystallizer (12) is communicated with the back side of the spray tower (6) through a pipeline.

4. The kiln wet flue gas purification and material recovery device according to claim 2, characterized in that: A flow guide port (19) is provided between the left side of the inner cavity of the first filter tank (28) and the right side of the inner cavity of the sedimentation tank (25), and a solenoid valve (27) is installed in the inner cavity of the flow guide port (19).

5. The kiln wet flue gas purification and material recovery device according to claim 1, characterized in that: The water inlet of the first pump (8) is fixedly connected to the external sodium hydroxide solution tank through a pipeline, and the water outlet of the first pump (8) is fixedly connected to the spray head (17) through a pipeline.

6. The kiln wet flue gas purification and material recovery device according to claim 1, characterized in that: The water inlet of the curved tube (24) is fixedly connected to the air outlet of the spray tower (6) through a pipeline, and the outlet of the curved tube (24) extends to the lower end of the bottom of the inner cavity of the purification box (10).

7. The kiln wet flue gas purification and material recovery device according to claim 1, characterized in that: A drain port (4) is provided at the lower portion of the front face of the water tank (9), and a valve is installed in the inner cavity of the drain port (4). A display (14) is fixedly connected to the left end of the front face of the water tank (9), and the input end of the display (14) is electrically connected to the output ends of the liquid level sensor (22) and the water temperature detector (23). A PLC controller (13) is fixedly connected to the right end of the front face of the water tank (9), and the output end of the PLC controller (13) is electrically connected to the input ends of the first pump (8), the evaporation crystallizer (12), the second pump (16), and the solenoid valve (27).

8. The kiln wet flue gas purification and material recovery device according to claim 1, characterized in that: The top of the bottom plate (1) is fixedly connected to a tool box (3), the inner cavity of the tool box (3) is fixedly connected to a partition (31), the right end of the top of the bottom plate (1) is fixedly connected to a battery box (2), and the inner cavity of the battery box (2) is fixedly connected to a storage battery.

9. A kiln wet flue gas purification and material recovery method, characterized by: The steps include: The kiln flue gas enters the inner cavity from the left side of the spray tower (6) through the air inlet pipe (7). The first pump (8) transports the alkaline solution in the external sodium hydroxide solution tank to the spray head (17), which sprays downward in the form of mist. The flue gas and the spray liquid contact each other in countercurrent in the spray tower (6). The acid pollutants are absorbed by the solution, and the particulate matter is captured by inertial collision and interception. The purified flue gas is discharged from the top of the spray tower (6) and enters the subsequent treatment link. The flue gas after spraying carries the residual heat into the curved pipe (24), which is immersed in the water body of the water tank (9). When the flue gas flows in the curved pipe (24), the heat is transferred to the water in the water tank (9) through the pipe wall, so that the flue gas is cooled and the water body is heated. The water temperature detector (23) monitors the water temperature in real time. The heated water can be discharged through the drain port (4) for other process links. The cooled flue gas enters the purification box (10) from the outlet of the curved pipe (24). The cooled flue gas The gas enters from the bottom of the purification box (10), and passes through the activated carbon filter (18) to absorb the residual organic matter, heavy metals and odor. Finally, the clean flue gas is discharged from the exhaust port (11) in compliance with the standards. The waste liquid at the bottom of the spray tower (6) flows into the sedimentation tank (25) of the box body (32) through the short pipe (26). After static sedimentation, the upper clear liquid is controlled by the solenoid valve (27) of the diversion port (19) and enters the first filter tank (28). The clear liquid first passes through the microfiltration membrane (30) to intercept large particles of impurities, and then passes through the nanofiltration membrane (29) to separate divalent ions. It then enters the second filter tank (21) through the inlet (15), and the monovalent ions are further concentrated by the reverse osmosis membrane (20). The concentrated waste liquid is transported to the evaporation crystallizer (12) through the second pump (16). The solid crystals (such as sodium salt) are separated by evaporation. The gas generated by evaporation returns to the spray tower (6) through the pipeline to participate in purification again, and the condensed water is recycled.

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