A high-humidity flue gas desulfurization and dust removal and white smoke treatment system

Abstract

This application belongs to the field of flue gas treatment technology and discloses a high-humidity flue gas desulfurization, dust removal and whitening treatment system, including a gas-to-gas heat pipe heat exchanger, a steam-water composite phase change heat exchanger, a desulfurization component, an induced draft fan, a wet electrostatic precipitator, and a chimney. The high-humidity flue gas containing sulfur and dust generated by the kiln first passes through a two-stage heat exchange in the gas-to-gas heat pipe heat exchanger and the steam-water composite phase change heat exchanger to reduce its temperature. Then, it undergoes desulfurization treatment by the desulfurization component and dust removal by the wet electrostatic precipitator. The desulfurized and dust-removed flue gas enters the chimney. The air outlet of the gas-to-gas heat pipe heat exchanger is connected to the chimney through a pipe. Its cooling medium is room temperature air. After heat exchange with the high-humidity flue gas containing sulfur and dust, the room temperature air is converted into hot air and discharged to the chimney. After mixing with the desulfurized and dust-removed flue gas, the white smoke in the flue gas is eliminated, thus realizing flue gas desulfurization, dust removal and whitening.

Description

Technical Field

[0001] This utility model relates to the field of flue gas treatment technology, and in particular to a high-humidity flue gas desulfurization, dust removal and whitening treatment system. Background Technology

[0002] In the glass manufacturing industry, glass furnaces are core production equipment, and the selection of their combustion systems directly affects flue gas emission characteristics and the difficulty of environmental control. In recent years, to improve thermal efficiency and reduce nitrogen oxide emissions, natural gas-oxygen combustion technology has been gradually promoted and applied in glass furnaces. This technology uses natural gas as a clean fuel and pure oxygen instead of air as a combustion aid, which can significantly reduce the amount of nitrogen introduced during combustion.

[0003] However, the combustion of natural gas generates a large amount of H2O, resulting in a high water vapor content in the flue gas. Furthermore, the soda ash and sodium sulfate in glass raw materials decompose at high temperatures to produce SO2 and SO3, leading to an increase in sulfur concentration in the flue gas. This sulfur readily combines with the high-concentration water vapor to form high-concentration sulfuric acid flue gas. Consequently, the high-temperature flue gas generated by the combustion of natural gas and pure oxygen in glass kilns possesses unique characteristics such as extremely high humidity, a high sulfuric acid content, and highly adhesive dust. Existing desulfurization, dust removal, and whitening technologies are not fully adapted to treating this type of flue gas, resulting in high energy consumption, high operation and maintenance costs, and poor effectiveness. Therefore, developing a highly efficient, energy-saving, and stable high-humidity flue gas desulfurization, dust removal, and whitening treatment system specifically for the natural gas-pure oxygen combustion scenario in glass kilns has become a key direction for solving the flue gas treatment challenges in this field. Utility Model Content

[0004] To address the aforementioned problems, this invention provides a high-humidity flue gas desulfurization, dust removal, and whitening treatment system.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a high-humidity flue gas desulfurization, dust removal and white smoke elimination treatment system, including a gas-to-gas heat pipe heat exchanger, a steam-water composite phase change heat exchanger, a desulfurization component, an induced draft fan, a wet electrostatic precipitator, and a chimney. The high-humidity sulfur-containing and dust-containing flue gas generated by the kiln passes through the gas-to-gas heat pipe heat exchanger, the steam-water composite phase change heat exchanger, the desulfurization component, the induced draft fan, and the wet electrostatic precipitator in sequence, and is then discharged through the chimney. The air outlet of the gas-to-gas heat pipe heat exchanger is connected to the chimney through a pipe. Its cooling medium is room temperature air. After the room temperature air exchanges heat with the high-humidity sulfur-containing and dust-containing flue gas, it is converted into hot air and discharged to the chimney. After mixing with the desulfurized and dust-removed flue gas, the white smoke in the flue gas is eliminated.

[0006] Furthermore, the desulfurization assembly includes a desulfurization spray tower and a circulating water tank. The desulfurization spray tower is equipped with several desulfurization nozzles. The liquid outlet at the bottom of the desulfurization spray tower is connected to the circulating water tank through a pipe. The circulating water tank is used to store desulfurization slurry. A slurry pump is installed outside the circulating water tank. The inlet end of the slurry pump is connected to the circulating water tank through a pipe, and the outlet end is connected to the desulfurization nozzles inside the desulfurization spray tower through a pipe.

[0007] Furthermore, a slurry heat exchanger is installed between the circulating water tank and the slurry pump, which is used to cool the desulfurization slurry returning from the desulfurization spray tower.

[0008] Furthermore, a lime silo is provided outside the circulating water pool, and a feeding auger is provided at the outlet of the lime silo. The outlet of the feeding auger extends into the circulating water pool, and a mixer is also provided inside the circulating water pool.

[0009] Furthermore, a mud pump and a plate mud press are installed outside the circulating water pool. The inlet of the mud pump is connected to the bottom of the circulating water pool through a pipe, and the outlet is connected to the plate mud press through a pipe.

[0010] Furthermore, a pH meter is installed on the connecting pipe between the slurry pump and the desulfurization nozzle.

[0011] Furthermore, the steam-water composite phase change heat exchanger includes a vertically arranged heat exchanger shell. The lower side wall of the heat exchanger shell is provided with a flue gas inlet and the upper side wall is provided with a flue gas outlet. A heat exchange tube assembly is provided in the middle of the inner cavity of the heat exchanger shell. A condensate inlet and a hot water outlet communicating with the heat exchange tube assembly are respectively provided on the lower and upper ends of the heat exchange tube assembly on the side wall of the heat exchanger shell. A drain port is also provided at the bottom end of the side wall of the heat exchanger shell.

[0012] In summary, this utility model has the following beneficial effects: In this application, a gas-to-gas heat pipe heat exchanger, a steam-to-water composite phase change heat exchanger, a desulfurization component, an induced draft fan, a wet electrostatic precipitator, and a chimney are provided. The high-humidity, sulfur-containing, and dust-containing flue gas generated by the kiln first undergoes two stages of heat exchange through the gas-to-gas heat pipe heat exchanger and the steam-to-water composite phase change heat exchanger to reduce its temperature. Then, it undergoes desulfurization treatment through the desulfurization component and dust removal through the wet electrostatic precipitator. The desulfurized and dust-removed flue gas enters the chimney and is finally mixed with the hot air displaced by the gas-to-gas heat pipe heat exchanger for heating, thereby achieving the purpose of eliminating white spots in the flue gas. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall process structure of an embodiment of this utility model;

[0014] Figure 2 This is a cross-sectional structural schematic diagram of the steam-water composite phase change heat exchanger according to an embodiment of this utility model;

[0015] Figure 3 This is a schematic diagram of the structure of the circulating water tank, lime silo, and other parts in an embodiment of this utility model.

[0016] In the diagram: 10. Gas-to-gas heat pipe heat exchanger; 20. Gas-to-water composite phase change heat exchanger; 21. Heat exchanger shell; 22. Flue gas inlet; 23. Flue gas outlet; 24. Heat exchanger tube assembly; 25. Hot water outlet; 26. Condensate inlet; 27. Drain outlet; 30. Desulfurization assembly; 31. Desulfurization spray tower; 32. Circulating water tank; 33. Desulfurization nozzle; 34. Slurry pump; 35. Slurry heat exchanger; 40. Exhaust fan; 50. Wet electrostatic precipitator; 60. Chimney; 70. Lime silo; 71. Feed auger; 72. Mixer; 73. Sludge pump; 74. Plate sludge press; 75. pH meter. Detailed Implementation

[0017] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0018] like Figure 1-3 As shown in the embodiment of this application, a high-humidity flue gas desulfurization, dust removal, and whitening treatment system is disclosed, including a gas-to-gas heat pipe heat exchanger 10, a steam-to-water composite phase change heat exchanger 20, a desulfurization component 30, an induced draft fan 40, a wet electrostatic precipitator 50, and a chimney 60. The high-humidity, sulfur-containing, and dust-containing flue gas generated by the kiln passes sequentially through the gas-to-gas heat pipe heat exchanger 10, the steam-to-water composite phase change heat exchanger 20, the desulfurization component 30, the induced draft fan 40, and the wet electrostatic precipitator 50 before being discharged through the chimney 60, thereby achieving the purpose of desulfurization and dust removal.

[0019] Specifically, the gas-to-gas heat pipe heat exchanger 10 uses corrosion-resistant 316L or ND steel as its main material. Flue gas flows through the lower end of the heat exchanger, while cooled air flows through the upper end. The cooling medium in the gas-to-gas heat pipe heat exchanger 10 is ambient temperature air. The flue gas and air flow in a counter-current manner, allowing the ambient temperature air to exchange heat with the high-humidity, sulfur- and dust-laden flue gas, transforming it into hot air. A blower is installed at the air inlet to facilitate the delivery of ambient temperature air into the heat exchanger. The air outlet is connected to the chimney 60 via a pipe, allowing the heated air to mix with the desulfurized and dust-removed flue gas within the chimney 60. This process heats the desulfurized and dust-removed flue gas before it is discharged from the chimney 60, eliminating white smoke in the flue gas and achieving the goal of eliminating white smoke in the flue gas.

[0020] The steam-water composite phase change heat exchanger 20 includes a vertically arranged heat exchanger shell 21, which is made of corrosion-resistant fiberglass. A flue gas inlet 22 is provided on the lower side wall of the heat exchanger shell 21, and a flue gas outlet 23 is provided on the upper side wall. A heat exchange tube assembly 24, composed of fluoroplastic heat exchange tubes, is located in the middle of the inner cavity of the heat exchanger shell 21. A hot water outlet 25 and a condensate inlet 26, respectively, are provided on the side wall of the heat exchanger shell 21 at the lower and upper ends of the heat exchange tube assembly 24, respectively, communicating with the heat exchange tube assembly 24. Flue gas enters from bottom to top, and condensate enters from top to bottom, exchanging heat through the heat exchange tube assembly 24, thereby heating the condensate and cooling the flue gas. The cooling medium of the steam-water composite phase change heat exchanger 20 is pure water or soft water. The pure water or soft water absorbs heat from the flue gas to produce hot water at 50-80℃, which is used for boiler feedwater, heating, or other production and domestic purposes. A drain port 27 is also provided at the bottom of the side wall of the heat exchanger shell 21. When the flue gas enters the heat exchanger shell 21, the dust in the flue gas will automatically settle to the bottom of the heat exchanger shell 21 under the action of gravity and be discharged out of the shell with the condensate, so as to avoid the phenomenon of dust adhering to the heat exchange tube and causing the heat exchanger to be blocked.

[0021] The desulfurization assembly 30 includes a desulfurization spray tower 31 and a circulating water tank 32. The desulfurization spray tower 31 is equipped with several desulfurization nozzles 33. Under high pressure, the nozzles 33 form a cone-shaped water mist that fully contacts the flue gas, reacting with the sulfur in the flue gas to achieve desulfurization. The circulating water tank 32 is a reinforced concrete structure lined with impermeable material and is used to store the desulfurization slurry. The outlet at the bottom of the desulfurization spray tower 31 is connected to the circulating water tank 32 via a pipe. A slurry pump 34 is installed outside the circulating water tank 32. The inlet of the slurry pump 34 is connected to the circulating water tank 32 via a pipe, and the outlet is connected to the desulfurization nozzles 33 inside the desulfurization spray tower 31 via a pipe, thus realizing a desulfurization slurry circulation loop: circulating water tank 32 - slurry pump 34 - desulfurization nozzles 33 - desulfurization spray tower 31 - circulating water tank 32.

[0022] A lime silo 70 is installed outside the circulating water tank 32. A feeding auger 71 is installed at the outlet of the lime silo 70, extending into the circulating water tank 32 to transport the lime from the lime silo 70 into the circulating water tank 32. A mixer 72 is also installed inside the circulating water tank 32. The mixer 72 agitates the lime and desulfurization slurry, causing a chemical reaction that displaces sulfate ions from the slurry, thus achieving desulfurization. A pH meter 75 is installed on the connecting pipe between the slurry pump 34 and the desulfurization nozzle 33. The pH meter 75 is used to detect the pH value of the desulfurization slurry, providing a basis for determining the amount of lime to be added.

[0023] A sludge pump 73 and a plate sludge press 74 are installed outside the circulating water tank 32. The inlet of the sludge pump 73 is connected to the bottom of the circulating water tank 32 through a pipe, and the outlet is connected to the plate sludge press 74 through a pipe. The CaSO3 and other oxidized precipitates generated by the reaction of lime and desulfurization slurry are sent to the plate sludge press 74 through the sludge pump 73, pressed into blocks, and then discharged.

[0024] Because the desulfurization slurry absorbs heat from the flue gas within the desulfurization spray tower 31, the temperature of both the desulfurization flue gas and the desulfurization slurry remains around 50℃ for an extended period. This high flue gas temperature and high moisture content negatively impact the whitening effect. A slurry heat exchanger 35 is installed between the circulating water tank 32 and the slurry pump 34 to cool the desulfurization slurry returning from the desulfurization spray tower 31. This reduces the slurry temperature to around 35℃, further lowering the moisture content of the flue gas within the desulfurization spray tower 31. The slurry heat exchanger 35 is made of corrosion-resistant special metal materials and employs a plate or tubular structure, enabling it to resist corrosion from fluorine and chloride ions and providing erosion and wear resistance.

[0025] Chimney 60 is made of corrosion-resistant and high-temperature-resistant fiberglass, including a fiberglass shell and a flow guide tube. The fiberglass can withstand temperatures of over 120℃, and the flow guide tube reduces the heat exchange resistance between flue gas and hot air.

[0026] The operating principle of the high-humidity flue gas desulfurization, dust removal, and whitening treatment system in this embodiment is as follows: The high-humidity, sulfur- and dust-containing flue gas produced by the kiln at 150-400℃ first passes through the gas-to-gas heat pipe heat exchanger 10, which lowers the flue gas temperature to about 180℃. The ambient temperature air inside the gas-to-gas heat pipe heat exchanger 10 absorbs the heat from the flue gas and converts it into hot air at 60-100℃. This hot air is connected to the chimney 60 through a pipe, serving as a heat source to increase the temperature of the terminal flue gas and thus eliminating whitening.

[0027] The flue gas from the gas-to-gas heat pipe heat exchanger 10 enters the steam-to-water composite phase change heat exchanger 20, where it exchanges heat with the pure water or soft water inside the steam-to-water composite phase change heat exchanger 20. The flue gas temperature drops to 60-90℃, and the pure water or soft water is heated to 50-80℃ hot water for boiler makeup, heating, or other production and domestic use.

[0028] The flue gas exiting the steam-water combined phase change heat exchanger 20 enters the desulfurization spray tower 31, where desulfurization slurry is sprayed through the desulfurization nozzles 33 to react with the sulfur in the flue gas. The displaced sulfate ions are returned to the circulating water tank 32 with the desulfurization slurry, where they react with lime to form CaSO3 precipitate. The precipitate is then discharged from the circulating water tank 32 by the action of the mud pump 73 and the plate mud press 74. The desulfurization slurry after the reaction continues to enter the desulfurization spray tower 31 under the action of the slurry pump 34 to react with the flue gas again.

[0029] After desulfurization, the flue gas enters the wet electrostatic precipitator 50 via the induced draft fan 40. After removing dust and colloids, it is discharged into the chimney 60. The flue gas after desulfurization and dust removal is mixed with the hot air discharged from the gas-to-gas heat pipe heat exchanger 10 in the chimney 60, which increases the flue gas temperature and realizes the flue gas whitening process.

[0030] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A high-humidity flue gas desulfurization, dust removal, and whitening treatment system, characterized in that: The system includes a gas-to-gas heat pipe heat exchanger (10), a steam-water composite phase change heat exchanger (20), a desulfurization component (30), an induced draft fan (40), a wet electrostatic precipitator (50), and a chimney (60). The high-humidity, sulfur-containing, and dust-containing flue gas generated by the kiln passes through the gas-to-gas heat pipe heat exchanger (10), the steam-water composite phase change heat exchanger (20), the desulfurization component (30), the induced draft fan (40), and the wet electrostatic precipitator (50) in sequence before being discharged through the chimney (60). The air outlet of the gas-to-gas heat pipe heat exchanger (10) is connected to the chimney (60) through a pipe. Its cooling medium is room temperature air. After the room temperature air exchanges heat with the high-humidity, sulfur-containing, and dust-containing flue gas, it is converted into hot air and discharged to the chimney (60). After mixing with the flue gas after desulfurization and dust removal, the white smoke in the flue gas is eliminated.

2. The high-humidity flue gas desulfurization, dust removal, and whitening treatment system according to claim 1, characterized in that: The desulfurization component (30) includes a desulfurization spray tower (31) and a circulating water tank (32). The desulfurization spray tower (31) is equipped with a number of desulfurization nozzles (33). The liquid outlet at the bottom of the desulfurization spray tower (31) is connected to the circulating water tank (32) through a pipe. The circulating water tank (32) is used to store desulfurization slurry. A slurry pump (34) is installed outside the circulating water tank (32). The inlet end of the slurry pump (34) is connected to the circulating water tank (32) through a pipe, and the outlet end is connected to the desulfurization nozzles (33) in the desulfurization spray tower (31) through a pipe.

3. The high-humidity flue gas desulfurization, dust removal, and whitening treatment system according to claim 2, characterized in that: A slurry heat exchanger (35) is provided between the circulating water tank (32) and the slurry pump (34). The slurry heat exchanger (35) is used to cool the desulfurization slurry that flows back from the desulfurization spray tower (31).

4. The high-humidity flue gas desulfurization, dust removal, and whitening treatment system according to claim 2, characterized in that: A lime silo (70) is provided outside the circulating water pool (32). A feeding auger (71) is provided at the outlet of the lime silo (70). The outlet of the feeding auger (71) extends into the circulating water pool (32). A mixer (72) is also provided inside the circulating water pool (32).

5. The high-humidity flue gas desulfurization, dust removal, and whitening treatment system according to claim 4, characterized in that: A mud pump (73) and a plate mud press (74) are installed outside the circulating water pool (32). The inlet of the mud pump (73) is connected to the bottom of the circulating water pool (32) through a pipe, and the outlet is connected to the plate mud press (74) through a pipe.

6. The high-humidity flue gas desulfurization, dust removal, and whitening treatment system according to claim 4, characterized in that: A pH meter (75) is installed on the connecting pipe between the slurry pump (34) and the desulfurization nozzle (33).

7. The high-humidity flue gas desulfurization, dust removal, and whitening treatment system according to claim 1, characterized in that: The steam-water composite phase change heat exchanger (20) includes a vertically arranged heat exchanger shell (21). The lower side wall of the heat exchanger shell (21) is provided with a flue gas inlet (22) and the upper side wall is provided with a flue gas outlet (23). A heat exchange tube assembly (24) is provided in the middle of the inner cavity of the heat exchanger shell (21). A condensate inlet (26) and a hot water outlet (25) communicating with the heat exchange tube assembly (24) are respectively provided on the side wall of the heat exchanger shell (21) at the lower end and the upper end of the heat exchange tube assembly (24). A drain port (27) is also provided at the bottom of the side wall of the heat exchanger shell (21).

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