A high-temperature flue gas emission desulfurization and denitrification device

Abstract

The present invention relates to the technical field of desulfurization and denitrification, and proposes a high-temperature flue gas emission desulfurization and denitrification device, comprising a denitrification tower, a dust removal device, a first desulfurization tower and a second desulfurization tower, a gas transmission channel connecting the denitrification tower and the dust removal device, a gas transmission pipeline connecting the dust removal device and the first desulfurization tower, a transmission pipeline connecting the first desulfurization tower and the second desulfurization tower, and also comprising an air intake channel, an air intake channel connecting the top of the denitrification tower, a gas transmission box body fixedly connected through one side of the air intake channel, a high-temperature gas chamber 1 and a high-temperature gas chamber 2 provided in the gas transmission box body, a secondary gas transmission chamber fixedly connected through the high-temperature gas chamber 1 and the high-temperature gas chamber 2. The above technical solution is used to solve the problem that when the desulfurization and denitrification equipment in the prior art repeatedly treats the flue gas, the repeated desulfurization and denitrification operation will have a poor treatment effect due to the lowered temperature of the flue gas after the initial treatment.

Description

Technical Field

[0001] The present invention relates to environmental protection engineering construction, and more specifically to the technical field of desulfurization and denitrification, and more specifically to a high-temperature flue gas emission desulfurization and denitrification device. Background Art

[0002] In various chemical plants or power plants, desulfurization and denitrification devices corresponding to the flue gas treatment capacity are always installed to perform desulfurization and denitrification operations on the high-temperature flue gas generated during the factory production process. The sulfur dioxide and nitrogen oxides in the flue gas are highly polluting to the environment. In order to protect the environment, the high-temperature flue gas needs to be injected into the desulfurization and denitrification device for flue gas treatment. When the desulfurization and denitrification devices in the prior art treat the flue gas, different processing methods need to be adopted. When it is necessary to treat the sulfur dioxide in the flue gas, the desulfurization liquid is usually sprayed to react with the sulfur dioxide in the flue gas to treat the flue gas. When it is necessary to treat the nitrogen oxides in the flue gas, it is generally necessary to rely on catalysts to denitrify the flue gas.

[0003] In the prior art, during the desulfurization and denitrification process of high-temperature flue gas, the high-temperature flue gas is first subjected to heat exchange cooling and preliminary dust removal operations, and then the high-temperature flue gas is transported to the denitrification equipment. The denitrification equipment injects a mixed denitrification agent into the high-temperature flue gas. After the denitrification agent and the high-temperature flue gas are preliminarily mixed and reacted, the nitrogen oxides in the flue gas are separated. Then, during the subsequent flue gas transportation process, the flue gas is transported to the dust removal equipment to remove the particulate matter in the flue gas. The flue gas is then transported to the desulfurization tower, so that the flue gas meets the emission requirements after the desulfurization operation, and finally the flue gas is cooled and discharged.

[0004] In order to ensure that the effect of flue gas treatment meets the requirements of direct emission, the existing technology generally requires multiple desulfurization and denitrification operations on the flue gas. However, after each desulfurization and denitrification operation on the flue gas, the temperature of the flue gas itself will be reduced. Regardless of whether the flue gas is undergoing desulfurization or denitrification operations, the flue gas needs to be desulfurized and denitrified at an appropriate temperature. Therefore, during actual use, the desulfurization and denitrification equipment in the existing technology will have the problem of poor treatment effect due to the temperature difference of the flue gas when repeatedly performing desulfurization and denitrification operations on the flue gas. Summary of the Invention

[0005] The present invention proposes a high-temperature flue gas emission desulfurization and denitrification device, which is used to solve the problem that when the desulfurization and denitrification equipment in the prior art repeatedly treats the flue gas, the temperature of the flue gas is lowered after the initial treatment, resulting in poor treatment effect of the repeated desulfurization and denitrification operations.

[0006] The technical solution of the present invention is as follows: a high-temperature flue gas emission desulfurization and denitrification device, comprising a denitrification tower, a dust removal device, a first desulfurization tower, and a second desulfurization tower, wherein a gas transmission channel is connected between the denitrification tower and the dust removal device, a gas transmission pipeline is connected between the dust removal device and the first desulfurization tower, and a transmission pipeline is connected between the first desulfurization tower and the second desulfurization tower, and further comprising:

[0007] An air inlet channel, the top of the denitrification tower is connected to the air inlet channel, one side of the air inlet channel is fixedly connected to a gas delivery box, a high-temperature gas chamber 1 and a high-temperature gas chamber 2 are provided in the gas delivery box, a secondary gas delivery cavity is fixedly connected between the high-temperature gas chamber 1 and the high-temperature gas chamber 2, the secondary gas delivery cavity is connected to the air delivery channel, and is used to deliver the flue gas after preliminary denitrification and to heat the flue gas in the high-temperature gas chamber 1 and the high-temperature gas chamber 2, and the gas delivery box is connected to the air inlet channel;

[0008] An insulation sleeve is provided on the outer side of the conveying pipeline, a gas flow structure is provided in the second high-temperature gas chamber, the gas flow structure is connected with the exhaust end of the second desulfurization tower, and the gas flow structure is connected with the insulation sleeve, and is used to use the treated gas to heat the flue gas that requires secondary desulfurization after heating.

[0009] In order to discharge the flue gas that requires preliminary denitrification and the flue gas that requires secondary denitrification into the air inlet channel, further, a gas heating chamber is provided on the top of the gas delivery box, the top of the high-temperature gas chamber one extends into the gas heating chamber, the high-temperature gas chamber one is connected to the top of the gas delivery box and an exhaust groove is provided, and the top of the secondary gas delivery cavity is connected to the gas heating chamber.

[0010] In order to discharge the secondary denitration gas into the air inlet channel, a connecting groove is further opened on one side of the exhaust groove to facilitate the secondary denitration gas discharged through the top of the secondary gas delivery cavity to be discharged into the air inlet channel.

[0011] In order to heat the secondary denitration gas, a burner is further provided on the side wall of the gas heating chamber for heating the secondary denitration gas discharged through the top of the secondary gas delivery cavity.

[0012] In order to adjust the discharge position of the gas after denitrification, further, a gas outlet trough is fixedly connected in the gas transmission channel, and two gas outlet chambers are provided on the gas outlet trough. A gas outlet valve pipe is connected between the gas outlet chamber and the gas outlet trough, and one of the gas outlet chambers is connected to the secondary gas transmission cavity.

[0013] In order to transport the high-temperature flue gas into the high-temperature gas chamber one and the high-temperature gas chamber two, further, the bottom of the high-temperature gas chamber one is connected to a flue gas injection channel, and an exhaust drum is rotatably arranged in the flue gas injection channel. An inlet groove is provided on one side of the exhaust drum, and both sides of the interior of the exhaust drum are connected to the exhaust structure. An exhaust box is provided at the bottom of the high-temperature gas chamber two, and the exhaust box is connected to the exhaust structure.

[0014] In order to utilize the heat of the high-temperature flue gas, further, the secondary gas delivery cavity is configured to be concave, and a plurality of heat dissipation fins are fixedly connected through the secondary gas delivery cavity.

[0015] In order to heat the treated gas and then use the gas to heat the flue gas after the preliminary desulfurization operation, the gas flow structure further includes a gas flow pipe and a gas exhaust box. The number of the gas flow pipes is set to multiple and all are arranged in the high-temperature gas chamber 2. The tops and bottoms of the multiple gas flow pipes are connected by connecting cylinders. The connecting cylinder located on the lower side is connected to the exhaust end of the second desulfurization tower. The gas exhaust box is fixedly connected to the air inlet channel, and the connecting cylinder located on the upper side is connected to the gas exhaust box. The gas exhaust box is connected to the insulation sleeve.

[0016] In order to utilize the high-temperature flue gas to heat the gas in the gas discharge box, further, a plurality of heat exchange slots are provided on the area of ​​the gas discharge box located inside the air inlet channel.

[0017] In order to use different denitrification liquids according to different flue gas temperatures, the denitrification tower is further provided with a liquid supply pipeline, one side of which is connected to a plurality of storage tanks for containing different denitrification liquids.

[0018] The working principle and beneficial effects of the present invention are:

[0019] In the present invention, during the desulfurization and denitrification operation of high-temperature flue gas, the high-temperature flue gas is first transported to the high-temperature gas chamber one, and then the high-temperature flue gas enters the air inlet channel. Finally, the high-temperature flue gas enters the denitrification tower for denitrification operation and is discharged into the gas transmission channel. The flue gas can be discharged into the secondary gas transmission cavity through the gas transmission channel. During the upward transportation of the flue gas, the temperature of the high-temperature flue gas transported in the high-temperature gas chamber one and the high-temperature gas chamber two is utilized through the heat exchange principle, so that the flue gas that needs to undergo secondary denitrification maintains a sufficient temperature. Then, during the transportation of the flue gas to the air inlet channel, a burner can be used to directly heat the secondary denitrification gas, and then the secondary denitrification gas is allowed to enter the denitrification tower again for denitrification operation, so that the secondary denitrification gas can maintain a sufficiently suitable denitrification temperature as much as possible, and the temperature of the high-temperature flue gas itself is utilized.

[0020] In the present invention, after the first desulfurization tower performs preliminary desulfurization on the flue gas after dust removal, the flue gas is continuously transported to the second desulfurization tower. By adding high-temperature gas into the insulation sleeve, the temperature of the flue gas after preliminary desulfurization is increased. By adding the gas discharged from the second desulfurization tower into the gas flow structure, the gas utilizes the high-temperature flue gas temperature in the high-temperature gas chamber 2 to increase the gas temperature during the flow of the gas in the gas flow structure. Then, after the gas flows through the air inlet channel, the gas temperature is further increased, and the heated gas enters the insulation sleeve, thereby heating the flue gas after preliminary desulfurization, so that the flue gas can continue to undergo desulfurization at an appropriate temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Figure 1 It is a schematic structural diagram of the present invention as a whole;

[0023] Figure 2 It is a schematic structural diagram of a partial cross-section of the present invention;

[0024] Figure 3 A schematic structural diagram of a partial cross-section from another perspective of the present invention;

[0025] Figure 4 For the present invention Figure 2 A schematic diagram of the partially enlarged structure at point A in the middle;

[0026] Figure 5 It is a partial cross-sectional structural diagram of the gas delivery box, the first high-temperature gas chamber, the second high-temperature gas chamber, the secondary gas delivery chamber and the gas heating chamber in the present invention;

[0027] Figure 6 For the present invention Figure 5 A schematic diagram of the partially enlarged structure at point B in the middle;

[0028] Figure 7 It is a schematic diagram of a partially sectional planar structure of the gas delivery box, the first high-temperature gas chamber, the second high-temperature gas chamber, the secondary gas delivery chamber and the gas heating chamber in the present invention;

[0029] Figure 8 It is a partial cross-sectional structural diagram of the smoke injection channel, the exhaust drum and the exhaust box in the present invention;

[0030] Figure 9 It is a schematic structural diagram of the cooperation between the secondary gas delivery cavity and the heat dissipation fins in the present invention.

[0031] Figure 1: Denitrification tower; 2: Dust removal equipment; 3: First desulfurization tower; 4: Second desulfurization tower; 5: Gas transmission channel; 6: Gas transmission pipeline; 7: Transmission pipeline; 8: Air inlet channel; 9: Gas transmission box; 10: High-temperature gas chamber 1; 11: High-temperature gas chamber 2; 12: Secondary gas transmission chamber; 13: Insulation sleeve; 14: Gas heating chamber; 15: Exhaust slot; 16: Connecting slot; 17: Burner; 18: Gas outlet slot; 19: , outlet chamber; 20, outlet valve pipe; 21, flue gas injection channel; 22, outlet drum; 23, inlet trough; 24, exhaust box; 25, heat dissipation fins; 26, gas flow pipeline; 27, connecting cylinder; 28, gas discharge box; 29, heat exchange tank; 30, liquid supply pipeline; 31, storage tank; 32, gear box; 33, transmission shaft; 34, motor drive equipment; 35, collection bucket; 36, exhaust equipment; 37, exhaust pipe. DETAILED DESCRIPTION

[0032] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 any creative efforts are within the scope of protection of the present invention.

[0033] like Figures 1 to 9 As shown, this embodiment proposes a high-temperature flue gas emission desulfurization and denitrification device, including a denitrification tower 1, a dust removal device 2, a first desulfurization tower 3 and a second desulfurization tower 4, an air transmission channel 5 is connected between the desulfurization tower 1 and the dust removal device 2, a gas transmission pipeline 6 is connected between the dust removal device 2 and the first desulfurization tower 3, and a transmission pipeline 7 is connected between the first desulfurization tower 3 and the second desulfurization tower 4. In the process of treating the high-temperature flue gas, the high-temperature flue gas is first subjected to a denitrification operation in the denitrification tower 1. After performing at least two denitrification operations, the denitrified flue gas is transported to the dust removal device 2 through the gas transmission pipeline 6. The dust removal device 2 is used to treat the dust and other impurities in the flue gas and then discharged into the first desulfurization tower 3 through the gas transmission pipeline 6. The flue gas is then discharged into the first desulfurization tower 3 through the gas transmission pipeline 6. A preliminary desulfurization operation is carried out in a desulfurization tower 3, and then the flue gas is transported to the second desulfurization tower 4 through a conveying pipeline 7 for a secondary desulfurization operation, thereby completely completing the treatment operation of the high-temperature flue gas. Among them, the desulfurization tower 1, the dust removal equipment 2, the first desulfurization tower 3 and the second desulfurization tower 4 are all existing technical equipment well known to those skilled in the art. The desulfurization tower 1 adopts the mutual cooperation between the spray desulfurization liquid and the catalyst module to separate the nitrogen oxides in the flue gas from the flue gas through catalytic reaction, and the dust removal equipment 2 can be a bag-type dust collector or an electrostatic precipitator, which can effectively remove solid impurities such as dust in the flue gas, and the first desulfurization tower 3 and the second desulfurization tower 4 both use spray desulfurization liquid to remove the sulfur dioxide component in the flue gas.

[0034] The denitrification tower 1 further includes an air inlet channel 8, the top of the denitrification tower 1 is connected to the air inlet channel 8, one side of the air inlet channel 8 is fixedly connected to a gas delivery box 9, a high-temperature gas chamber 10 and a high-temperature gas chamber 2 11 are provided in the gas delivery box 9, a secondary gas delivery cavity 12 is fixedly connected between the high-temperature gas chamber 10 and the high-temperature gas chamber 2 11, the secondary gas delivery cavity 12 is connected to the air delivery channel 5, and is used for delivering the flue gas after preliminary denitrification, and for heating the flue gas in the high-temperature gas chamber 10 and the high-temperature gas chamber 2 11. The gas delivery box 9 is connected to the air inlet channel 8. The flue gas is connected to the high-temperature gas chamber 8. In order to maintain the temperature of the flue gas that needs to undergo secondary denitration, the flue gas after preliminary denitration is transferred to the secondary gas delivery cavity 12 through the gas delivery channel 5. Then, during the transportation process of the flue gas in the secondary gas delivery cavity 12, the temperature of the high-temperature flue gas delivered in the high-temperature gas chamber 10 and the high-temperature gas chamber 2 11 is increased through the working principle of heat exchange. The temperature of the secondary denitration gas delivered in the secondary gas delivery cavity 12 is then transported to the air inlet channel 8 and further transported to the denitration tower 1 for denitration.

[0035] A gas heating chamber 14 is provided on the top of the gas delivery box 9. The top of the high-temperature gas chamber 10 extends into the gas heating chamber 14. The high-temperature gas chamber 10 is connected to the top of the gas delivery box 9 and an exhaust slot 15 is provided. The top of the secondary gas delivery chamber 12 is connected to the gas heating chamber 14. During the transportation of the secondary denitrification gas in the secondary gas delivery chamber 12, the secondary denitrification gas will enter the gas heating chamber 14. The top of the high-temperature gas chamber 10 is located in the gas heating chamber 14. The temperature of the high-temperature flue gas transported in the high-temperature gas chamber 10 is used to maintain the temperature in the gas heating chamber 14. The high-temperature gas discharged from the high-temperature gas chamber 10 will be discharged into the air inlet channel 8 through the exhaust slot 15.

[0036] A connecting groove 16 is provided on one side of the exhaust groove 15, so that the secondary denitration gas discharged from the top of the secondary gas delivery cavity 12 can be discharged into the air inlet passage 8. After the secondary denitration gas transported in the secondary gas delivery cavity 12 enters the gas heating chamber 14, it can enter between the multiple exhaust grooves 15 through the connecting groove 16, so that the secondary denitration gas can also enter the air inlet passage 8.

[0037] A burner 17 is provided on the side wall of the gas heating chamber 14, which is used to heat the secondary denitrification gas discharged through the top of the secondary gas conveying chamber 12. After the secondary denitrification gas is conveyed into the gas heating chamber 14, the secondary denitrification gas is fully heated by the burner 17, so that the secondary denitrification gas can maintain a sufficient temperature for subsequent denitrification operations. In addition, temperature sensing equipment is provided in the secondary gas conveying chamber 12, the high-temperature gas chamber 10 and the high-temperature gas chamber 2 11, which are used to strictly monitor the actual temperatures of various gases and judge the actual temperatures in different gas conveying processes. The burner 17 is a prior art equipment well known to those skilled in the art, and the gas is directly heated by spraying flames through the burner 17.

[0038] An air outlet trough 18 is fixedly connected to the gas transmission channel 5, and two air outlet chambers 19 are provided on the air outlet trough 18. An air outlet valve pipe 20 is connected between the air outlet chamber 19 and the air outlet trough 18. One of the air outlet chambers 19 is connected to the secondary gas transmission cavity 12. By controlling the opening and closing of the air outlet valve pipes 20 on both sides, the denitrification gas treated by the denitrification tower 1 is controlled to be discharged into one of the air outlet chambers 19. The two air outlet chambers 19 can guide the gas to the dust removal equipment 2 or the secondary gas transmission cavity 12 respectively.

[0039] The bottom of the high-temperature gas chamber 10 is connected to a flue gas injection channel 21, and an air outlet drum 22 is rotatably provided in the flue gas injection channel 21. An inlet groove 23 is provided on one side of the air outlet drum 22, and both sides of the interior of the air outlet drum 22 are connected to an air outlet structure. An exhaust box 24 is provided at the bottom of the high-temperature gas chamber 21, and the exhaust box 24 is connected to the air outlet structure. When it is necessary to transport the high-temperature flue gas into the high-temperature gas chamber 21, the high-temperature gas heats the gas in the gas flow structure during the flow of the high-temperature gas in the high-temperature gas chamber 21. The high-temperature gas chamber 21 is connected to the air inlet channel 8, and the air outlet drum 22 is driven to rotate so that the inlet groove 23 faces the high-temperature flue gas inlet direction of the flue gas injection channel 21. The high-temperature flue gas will enter the air outlet drum 22, and the high-temperature flue gas is transported to the high-temperature gas chamber 2 11 through the air outlet structure, so that the high-temperature flue gas flows in the high-temperature gas chamber 2 11;

[0040] The air outlet drum 22 is provided with a gear box 32, which is rotatably connected to a transmission shaft 33. The transmission shaft 33 extends through and is rotatably connected to the smoke injection channel 21. The smoke injection channel 21 is provided with a motor drive device 34. The output end of the motor drive device 34 is fixedly connected to the transmission shaft 33. When the motor drive device 34 is started, the transmission shaft 33 is driven to rotate. The transmission effect between the transmission shaft 33 and the gear box 32 drives the air outlet drum 22 to rotate in the smoke injection channel 21.

[0041] A collecting bucket 35 is provided on both sides of the air outlet drum 22, and the collecting bucket 35 is rotatably set in the air outlet drum 22. An exhaust device 36 is provided on the outside of the smoke injection channel 21, and an exhaust pipe 37 is connected between the exhaust device 36 and the collecting bucket 35. The exhaust pipe 37 is rotatably set in the air outlet drum 22. The exhaust device 36 is connected to the exhaust box 24. After the high-temperature smoke enters the air outlet drum 22, the exhaust device 36 is started to transport the high-temperature smoke to the exhaust box 24 through the collecting bucket 35 and the exhaust pipe 37, and finally the high-temperature smoke flows in the high-temperature gas chamber 21. The exhaust device 36 is a technical equipment well known to those skilled in the art, which realizes the extraction and transportation functions of the smoke.

[0042] The secondary gas delivery cavity 12 is set to be concave, and a plurality of heat dissipation fins 25 are fixedly connected through the secondary gas delivery cavity 12. The two sides of the heat dissipation fins 25 are respectively in contact with the high-temperature flue gas and the secondary denitrification gas. The heat of the high-temperature flue gas is transferred to the secondary denitrification gas using the heat exchange principle. By setting the shape of the secondary gas delivery cavity 12 to be concave, the contact area between the high-temperature flue gas and the secondary gas delivery cavity 12 can be increased.

[0043] An insulation sleeve 13 is provided on the outer side of the conveying pipe 7, and an exhaust valve pipe is connected to the insulation sleeve 13. The exhaust valve pipe is used to discharge the gas in the insulation sleeve 13. A gas flow structure is provided in the high-temperature gas chamber 11, and the gas flow structure is connected to the exhaust end of the second desulfurization tower 4. The gas flow structure and the insulation sleeve 13 are connected, and are used to use the treated gas to heat the flue gas that needs secondary desulfurization after heating. A branch pipeline is provided on the exhaust end of the second desulfurization tower 4, and the branch pipeline is connected to the connecting cylinder 27 located on the lower side. The gas treated by the second desulfurization tower 4 is added to the gas flow structure, and then the gas is heated by the high-temperature flue gas in the high-temperature gas chamber 11. After the gas is heated, it is injected into the insulation sleeve 13 to increase the temperature of the flue gas after the initial desulfurization, so that the flue gas can be efficiently desulfurized for the second time.

[0044] The gas flow structure includes a gas flow pipe 26 and a gas discharge box 28. The number of gas flow pipes 26 is set to multiple and all are arranged in the high-temperature gas chamber 2 11. The top and bottom of the multiple gas flow pipes 26 are connected with a connecting cylinder 27. The connecting cylinder 27 on the lower side is connected to the exhaust end of the second desulfurization tower 4. The gas discharge box 28 is fixedly connected to the air inlet channel 8. The connecting cylinder 27 on the upper side is connected to the gas discharge box 28. The gas discharge box 28 is connected to the insulation sleeve 13, which connects the second desulfurization tower 4 to the second desulfurization tower 4. The gas discharged from the desulfurization tower 4 that basically meets the emission standards is transported to the connecting cylinder 27 located on the lower side, and the gas flows upward in multiple gas flow pipes 26. Then, the high-temperature flue gas in the high-temperature gas chamber 211 is used to increase the temperature of the gas in the gas flow pipe 26. After the gas is filled into the gas discharge box 28, the gas further uses the temperature of the high-temperature flue gas in the air inlet channel 8 to increase its own temperature. The heated gas is then filled into the insulation sleeve 13, and then the gas heats the flue gas transported in the delivery pipe 7.

[0045] The gas exhaust box 28 is provided with a plurality of heat exchange grooves 29 in the area inside the air inlet channel 8. By providing a plurality of heat exchange grooves 29, the contact area between the outer wall of the gas exhaust box 28 and the high-temperature flue gas is further increased, so that the gas flowing in the gas exhaust box 28 increases its own temperature.

[0046] The denitrification tower 1 is provided with a liquid supply pipeline 30, and one side of the liquid supply pipeline 30 is connected to a plurality of storage tanks 31 for containing different denitrification liquids. Even with the use of high-temperature flue gas and the burner 17, it is difficult to raise the temperature of the gas that needs to undergo secondary denitrification to the initial denitrification temperature. For the secondary denitrification gas after a slight temperature drop, targeted denitrification liquid can be used. By injecting the denitrification liquid in different storage tanks 31 into the liquid supply pipeline 30, the liquid supply pipeline 30 injects the denitrification liquid into the spray structure in the denitrification tower 1, so that the denitrification liquid is sprayed to perform denitrification on the flue gas in the denitrification tower 1.

[0047] The working principle of the high-temperature flue gas emission desulfurization and denitrification device:

[0048] Step 1: Initial denitration: Inject high-temperature flue gas into the denitration tower 1 through the flue gas injection channel 21, the high-temperature gas chamber 10 and the air inlet channel 8 to perform initial denitration.

[0049] Step 2, secondary denitration: The flue gas discharged from the denitration tower 1 is injected into the secondary gas delivery cavity 12 through the gas outlet trough 18 and one of the gas outlet chambers 19. Then, during the process of the flue gas being transported into the secondary gas delivery cavity 12, the high-temperature gas in the high-temperature gas chamber 10 is used to heat the secondary denitration gas. After the secondary denitration gas is injected into the gas heating chamber 14, it continues to heat up under the action of the burner 17. Then, the secondary denitration gas is injected into the air inlet channel 8 and finally enters the denitration tower 1 for secondary denitration.

[0050] Step 3: Flue gas dust removal: The flue gas after secondary denitrification is transported to the dust removal equipment 2 through the gas pipeline 6, and the flue gas is subjected to dust removal operation in the dust removal equipment 2;

[0051] Step 4: Flue gas desulfurization: The flue gas is discharged into the first desulfurization tower 3 through the gas pipeline 6, and then the flue gas is subjected to a preliminary desulfurization operation in the first desulfurization tower 3, and then the flue gas is transported to the second desulfurization tower 4 through the transmission pipeline 7 for a secondary desulfurization operation;

[0052] Step 5, gas heating: The gas discharged from the second desulfurization tower 4 that basically meets the emission standards is transported to the connecting cylinder 27 located on the lower side, and the gas flows upward in multiple gas flow pipes 26. Then, the high-temperature flue gas in the high-temperature gas chamber 2 11 is used to increase the temperature of the gas in the gas flow pipe 26. After the gas is filled into the gas discharge box 28, the gas further uses the temperature of the high-temperature flue gas in the air inlet channel 8 to increase its own temperature. The heated gas is then filled into the insulation sleeve 13, and then the gas is used to heat the flue gas transported in the delivery pipe 7.

[0053] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-temperature flue gas emission desulfurization and denitrification device, comprising a denitrification tower (1), a dust removal device (2), a first desulfurization tower (3) and a second desulfurization tower (4), wherein a gas transmission channel (5) is connected between the denitrification tower (1) and the dust removal device (2), a gas transmission pipeline (6) is connected between the dust removal device (2) and the first desulfurization tower (3), and a transmission pipeline (7) is connected between the first desulfurization tower (3) and the second desulfurization tower (4), characterized in that: Also includes: An air inlet channel (8), the top of the denitrification tower (1) is connected to the air inlet channel (8), one side of the air inlet channel (8) is fixedly connected to a gas delivery box (9), a high-temperature gas chamber 1 (10) and a high-temperature gas chamber 2 (11) are provided in the gas delivery box (9), a secondary gas delivery chamber (12) is fixedly connected between the high-temperature gas chamber 1 (10) and the high-temperature gas chamber 2 (11), the secondary gas delivery chamber (12) is connected to the air delivery channel (5), and is used for delivering the flue gas after preliminary denitrification, and for heating the flue gas in the high-temperature gas chamber 1 (10) and the high-temperature gas chamber 2 (11), and the gas delivery box (9) is connected to the air inlet channel (8); A heat-insulating sleeve (13) is provided on the outer side of the delivery pipe (7), a gas flow structure is provided in the second high-temperature gas chamber (11), the gas flow structure is communicated with the exhaust end of the second desulfurization tower (4), and the gas flow structure is communicated with the heat-insulating sleeve (13) for heating the flue gas requiring secondary desulfurization by using the treated gas after the temperature is increased; The bottom of the high-temperature gas chamber (10) is connected to a smoke injection channel (21), an exhaust drum (22) is rotatably provided in the smoke injection channel (21), an inlet groove (23) is provided on one side of the exhaust drum (22), both sides of the interior of the exhaust drum (22) are connected to an exhaust structure, and an exhaust box (24) is provided at the bottom of the high-temperature gas chamber (11), and the exhaust box (24) is connected to the exhaust structure; The gas flow structure comprises: A gas flow pipe (26), wherein the number of the gas flow pipes (26) is set to be multiple and all are arranged in the second high-temperature gas chamber (11), and a connecting cylinder (27) is connected between the top and bottom of the multiple gas flow pipes (26), and the connecting cylinder (27) located on the lower side is connected to the exhaust end of the second desulfurization tower (4); A gas discharge box (28) is provided, the gas discharge box (28) being fixedly connected to the air inlet passage (8), the connecting cylinder (27) located on the upper side being in communication with the gas discharge box (28), and the gas discharge box (28) being in communication with the heat-insulating sleeve (13).

2. The high-temperature flue gas desulfurization and denitrification device according to claim 1, characterized in that: A gas heating chamber (14) is provided on the top of the gas delivery box (9), the top of the high-temperature gas chamber 1 (10) extends into the gas heating chamber (14), the high-temperature gas chamber 1 (10) is connected to the top of the gas delivery box (9) and is provided with an exhaust groove (15), and the top of the secondary gas delivery chamber (12) is connected to the gas heating chamber (14).

3. The high-temperature flue gas desulfurization and denitrification device according to claim 2, characterized in that: A connecting groove (16) is provided on one side of the exhaust groove (15) to facilitate the secondary denitrification gas discharged through the top of the secondary gas delivery cavity (12) to be discharged into the air inlet channel (8).

4. The high-temperature flue gas desulfurization and denitrification device according to claim 3, characterized in that: A burner (17) is provided on the side wall of the gas heating chamber (14) for heating the secondary denitrification gas discharged through the top of the secondary gas delivery chamber (12).

5. The high-temperature flue gas desulfurization and denitrification device according to claim 4, characterized in that: An air outlet groove (18) is fixedly connected to the air delivery channel (5), and two air outlet chambers (19) are provided on the air outlet groove (18). An air outlet valve pipe (20) is connected between the air outlet chamber (19) and the air outlet groove (18), and one of the air outlet chambers (19) is connected to the secondary gas delivery cavity (12).

6. The high-temperature flue gas desulfurization and denitrification device according to claim 1, characterized in that: The secondary gas delivery cavity (12) is configured to be concave, and a plurality of heat dissipation fins (25) are fixedly connected through the secondary gas delivery cavity (12).

7. The high-temperature flue gas desulfurization and denitrification device according to claim 6, characterized in that: The gas discharge box (28) is provided with a plurality of heat exchange slots (29) in an area located inside the air inlet channel (8).

8. The high-temperature flue gas desulfurization and denitrification device according to claim 1, characterized in that: The denitration tower (1) is provided with a liquid supply pipeline (30), and one side of the liquid supply pipeline (30) is connected to a plurality of storage tanks (31) for containing different denitration liquids.

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