Desulfurization and denitrification device for high-temperature flue gas emission

Abstract

The invention relates to the technical field of desulfurization and denitrification, and provides a high-temperature flue gas emission desulfurization and denitrification device which comprises a denitrification tower, dust removal equipment, a first desulfurization tower and a second desulfurization tower, a gas transmission channel is communicated between the denitrification tower and the dust removal equipment, and a gas transmission pipeline is communicated between the dust removal equipment and the first desulfurization tower. A conveying pipeline is communicated between the first desulfurization tower and the second desulfurization tower, the device further comprises a gas inlet channel, the top of the denitration tower is communicated with the gas inlet channel, one side of the gas inlet channel is fixedly connected with a gas conveying box in a penetrating mode, and a first high-temperature gas cavity and a second high-temperature gas cavity are formed in the gas conveying box; a secondary gas conveying cavity is fixedly connected between the first high-temperature gas cavity and the second high-temperature gas cavity in a penetrating mode. By means of the technical scheme, the problem that when desulfurization and denitrification equipment in the prior art conducts repeated treatment on flue gas, the treatment effect of repeated desulfurization and denitrification operation is poor due to the fact that the temperature is reduced after primary treatment of the flue gas is solved.

Description

Technical Field

[0001] The present invention relates to the construction of environmental protection projects, and more specifically to the technical field of desulfurization and denitrification. Specifically, it relates to a desulfurization and denitrification device for high-temperature flue gas emissions. 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 carry out desulfurization and denitrification operations on the high-temperature flue gas generated during the production process of the plant. 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 existing desulfurization and denitrification device treats the flue gas, different processing methods need to be adopted. When it is necessary to treat sulfur dioxide in the flue gas, the method of spraying desulfurization liquid is usually used to react with sulfur dioxide in the flue gas to treat the flue gas. When it is necessary to treat nitrogen oxides in the flue gas, generally, a catalyst is required to carry out denitrification treatment on the flue gas.

[0003] In the prior art, during the desulfurization and denitrification operation of high-temperature flue gas, first, the high-temperature flue gas is 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 is initially mixed and reacted with the high-temperature flue gas, nitrogen oxides in the flue gas are separated out. Then, during the subsequent transportation of the flue gas, the flue gas is transported to the dust removal equipment to remove particulate matter in the flue gas, and then the flue gas is transported to the desulfurization tower. After the flue gas undergoes desulfurization operation, it meets the emission requirements, and finally, the flue gas is cooled and discharged.

[0004] In the prior art, in order to ensure that the treatment effect of the flue gas meets the requirements of direct emission, during the desulfurization and denitrification operation of the flue gas, it is generally necessary to carry out 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. And whether the flue gas undergoes desulfurization or denitrification operation, it is necessary to carry out desulfurization and denitrification operations on the flue gas at an appropriate temperature. Therefore, in the actual use process of the desulfurization and denitrification equipment in the prior art, when realizing repeated desulfurization and denitrification operations on the flue gas, the problem of poor treatment effect will be caused due to the temperature difference of the flue gas. Summary of the Invention

[0005] The present invention provides a desulfurization and denitrification device for high-temperature flue gas emissions, which is used to solve the problem that in the prior art, when the desulfurization and denitrification equipment repeatedly treats the flue gas, the repeated desulfurization and denitrification operation treatment effect is not good due to the temperature reduction of the flue gas after preliminary treatment.

[0006] The technical solution of the present invention is as follows: A desulfurization and denitrification device for high-temperature flue gas emissions, including a denitrification tower, a dust removal device, a first desulfurization tower, and a second desulfurization tower. There is a gas transmission channel connected between the denitrification tower and the dust removal device, a gas transmission pipeline connected between the dust removal device and the first desulfurization tower, and a conveying pipeline connected between the first desulfurization tower and the second desulfurization tower. It also includes: An intake channel, the top of the denitrification tower is connected to the intake channel. One side of the intake channel is fixedly connected through a gas transmission box body. Inside the gas transmission box body, there are a high-temperature gas chamber one and a high-temperature gas chamber two. There is a secondary gas transmission cavity fixedly connected through between the high-temperature gas chamber one and the high-temperature gas chamber two. The secondary gas transmission cavity is connected to the gas transmission channel, used for conveying the flue gas after preliminary denitrification, and raising the temperature of the flue gas in the high-temperature gas chamber one and the high-temperature gas chamber two. The gas transmission box body is connected to the intake channel; A heat preservation sleeve, the heat preservation sleeve is sleeved outside the conveying pipeline. Inside the high-temperature gas chamber two, there is a gas flow structure. The gas flow structure is connected to the exhaust end of the second desulfurization tower. The gas flow structure is connected to the heat preservation sleeve, used for heating the flue gas that needs secondary desulfurization with the processed gas after temperature rise.

[0007] In order to discharge the flue gas that needs preliminary denitrification and the flue gas that needs secondary denitrification into the intake channel. Further, a gas heating chamber is arranged at the top of the gas transmission box body. The top of the high-temperature gas chamber one extends into the gas heating chamber. An exhaust groove is opened for communication between the top of the high-temperature gas chamber one and the top of the gas transmission box body. The top of the secondary gas transmission cavity is connected to the gas heating chamber.

[0008] In order to discharge the secondary denitrification gas into the intake channel. Further, a communication groove is opened on one side of the exhaust groove, so that the secondary denitrification gas discharged from the top of the secondary gas transmission cavity can be discharged into the intake channel.

[0009] In order to heat the secondary denitrification gas. Further, a burner is arranged on the side wall of the gas heating chamber, used for heating the secondary denitrification gas discharged from the top of the secondary gas transmission cavity.

[0010] In order to adjust the discharge position of the denitrified gas. Further, an air outlet groove body is fixedly connected in the gas transmission channel. There are two air outlet chambers arranged on the air outlet groove body. An air outlet valve pipe is connected for communication between the air outlet chamber and the air outlet groove body. One of the air outlet chambers is connected to the secondary gas transmission cavity.

[0011] In order to convey high-temperature flue gas into the interior of High-temperature Gas Chamber 1 and High-temperature Gas Chamber 2, further, a flue gas injection channel is connected to the bottom of High-temperature Gas Chamber 1. A gas outlet rotating cylinder is rotatably arranged in the flue gas injection channel. An inlet groove is formed on one side of the gas outlet rotating cylinder. Gas outlet structures are connected to both sides inside the gas outlet rotating cylinder. An exhaust gas box body is arranged at the bottom of High-temperature Gas Chamber 2, and the exhaust gas box body is connected to the gas outlet structure.

[0012] In order to utilize the heat of high-temperature flue gas, further, the secondary gas conveying cavity is set in a concave shape, and a plurality of heat dissipation fins are fixedly connected through the secondary gas conveying cavity.

[0013] In order to heat the treated gas and then use the gas to heat the flue gas after preliminary desulfurization operation, further, the gas flow structure includes gas flow pipelines and a gas discharge box body. The number of gas flow pipelines is set to be multiple and they are all arranged in High-temperature Gas Chamber 2. Connecting cylinders are connected between the top and bottom of the multiple gas flow pipelines. The connecting cylinder located on the lower side is connected to the exhaust end of the Second Desulfurization Tower. The gas discharge box body is fixedly connected through the intake channel. The connecting cylinder located on the upper side is connected to the gas discharge box body, and the gas discharge box body is connected to the heat preservation sleeve.

[0014] In order to use high-temperature flue gas to heat the gas in the gas discharge box body, further, a plurality of heat exchange grooves are formed in the area of the gas discharge box body located inside the intake channel.

[0015] In order to use different denitration liquids according to different flue gas temperatures, further, a liquid supply pipeline is arranged on the denitration tower, and a plurality of storage tanks for containing different denitration liquids are connected to one side of the liquid supply pipeline.

[0016] The working principle and beneficial effects of the present invention are as follows: In the present invention, during the desulfurization and denitration operation of high-temperature flue gas, first, the high-temperature flue gas is conveyed into High-temperature Gas Chamber 1, then the high-temperature flue gas enters the intake channel, and finally the high-temperature flue gas enters the denitration tower for denitration operation and is discharged into the gas transmission channel. The flue gas can be discharged into the secondary gas conveying cavity through the gas transmission channel. During the upward conveyance of the flue gas, the heat exchange principle is used to utilize the temperature of the high-temperature flue gas conveyed in High-temperature Gas Chamber 1 and High-temperature Gas Chamber 2, so that the flue gas requiring secondary denitration maintains a sufficient temperature. Then, during the conveyance of the flue gas into the intake channel, a burner can be used to directly heat the secondary denitration gas, and then the secondary denitration gas enters the denitration tower again for denitration operation, as much as possible to make the secondary denitration gas maintain a sufficient and appropriate denitration temperature, and the temperature of the high-temperature flue gas itself is utilized.

[0017] In the present invention, after the preliminary desulfurization operation of the flue gas after dust removal is carried out in the first desulfurization tower, during the process of continuously transporting the flue gas to the second desulfurization tower, by injecting high-temperature gas into the heat preservation sleeve, the temperature of the flue gas after preliminary desulfurization is increased. By injecting the gas discharged from the second desulfurization tower into the gas flow structure, during the flow of the gas in the gas flow structure, the gas utilizes the high-temperature flue gas temperature in the high-temperature gas chamber two to increase the gas temperature. Then, after the gas flows through the intake passage, the gas temperature is further increased, and the heated gas enters the heat preservation sleeve, thereby heating the flue gas after preliminary desulfurization, so that the flue gas can continue the desulfurization operation at an appropriate temperature subsequently. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0019] Figure 1 is a schematic structural diagram of the whole of the present invention; Figure 2 is a schematic structural diagram of a partial cross-section of the present invention; Figure 3 is a schematic structural diagram of a partial cross-section of the present invention from another perspective; Figure 4 For the present invention Figure 2 is a schematic structural diagram of a partial enlarged view at A in the present invention; Figure 5 is a schematic structural diagram of a partial cross-section of the cooperation of the gas delivery box, the first high-temperature gas chamber, the second high-temperature gas chamber, the secondary gas delivery cavity and the gas heating chamber in the present invention; Figure 6 For the present invention Figure 5 is a schematic structural diagram of a partial enlarged view at B in the present invention; Figure 7 is a schematic plan structural diagram of a partial cross-section of the cooperation of the gas delivery box, the first high-temperature gas chamber, the second high-temperature gas chamber, the secondary gas delivery cavity and the gas heating chamber in the present invention; Figure 8 is a schematic structural diagram of a partial cross-section of the cooperation of the flue gas injection channel, the gas outlet rotating cylinder and the exhaust box in the present invention; Figure 9 is a schematic structural diagram of the cooperation of the secondary gas delivery cavity and the heat dissipation fins in the present invention.

[0020] In the figure: 1, denitration tower; 2, dust removal equipment; 3, first desulfurization tower; 4, second desulfurization tower; 5, gas transmission channel; 6, gas transmission pipeline; 7, conveying pipeline; 8, intake channel; 9, gas transmission box body; 10, high-temperature gas chamber 1; 11, high-temperature gas chamber 2; 12, secondary gas transmission cavity; 13, heat preservation sleeve; 14, gas heating chamber; 15, exhaust groove; 16, communication groove; 17, burner; 18, air outlet groove body; 19, air outlet chamber; 20, air outlet valve pipe; 21, flue gas injection channel; 22, air outlet rotating cylinder; 23, inlet groove; 24, exhaust box body; 25, heat dissipation fins; 26, gas flow pipeline; 27, connecting cylinder body; 28, gas discharge box body; 29, heat exchange groove; 30, liquid supply pipeline; 31, storage tank; 32, gear box; 33, transmission shaft; 34, motor drive equipment; 35, collection hopper body; 36, air extraction equipment; 37, air extraction pipe. Specific implementation mode

[0021] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of the present invention.

[0022] As Figures 1 to 9 shown, this embodiment proposes a high-temperature flue gas emission desulfurization and denitration device, including a denitration tower 1, dust removal equipment 2, a first desulfurization tower 3 and a second desulfurization tower 4. There is a gas transmission channel 5 connected between the denitration tower 1 and the dust removal equipment 2, a gas transmission pipeline 6 connected between the dust removal equipment 2 and the first desulfurization tower 3, and a conveying pipeline 7 connected between the first desulfurization tower 3 and the second desulfurization tower 4. During the treatment of high-temperature flue gas, first, the high-temperature flue gas is subjected to denitration operation in the denitration tower 1. After at least two denitration operations, the denitrified flue gas is transported to the dust removal equipment 2 through the gas transmission pipeline 6. The dust removal equipment 2 is used to treat impurities such as dust in the flue gas and then discharge it into the first desulfurization tower 3 through the gas transmission pipeline 6. Then, the flue gas is subjected to preliminary desulfurization operation in the first desulfurization tower 3, and then the flue gas is transported to the second desulfurization tower 4 through the conveying pipeline 7 for secondary desulfurization operation, completely completing the treatment operation of the high-temperature flue gas. Among them, the denitration tower 1, the dust removal equipment 2, the first desulfurization tower 3 and the second desulfurization tower 4 are all well-known prior art equipment in the art. The denitration tower 1 adopts the mutual cooperation between the sprayed denitration liquid and the catalyst module, and separates the nitrogen oxides in the flue gas from the flue gas through catalytic reaction. The dust removal equipment 2 can be a bag filter or an electrostatic precipitator, which can effectively remove solid impurities such as dust in the flue gas. The first desulfurization tower 3 and the second desulfurization tower 4 both adopt the sprayed desulfurization liquid to remove the sulfur dioxide component in the flue gas.

[0023] It also includes an intake passage 8. The top of the denitration tower 1 is connected to the intake passage 8. One side of the intake passage 8 is fixedly connected through penetration with a gas delivery box 9. Inside the gas delivery box 9, there are a first high-temperature gas chamber 10 and a second high-temperature gas chamber 11. A secondary gas delivery cavity 12 is fixedly connected through penetration between the first high-temperature gas chamber 10 and the second high-temperature gas chamber 11. The secondary gas delivery cavity 12 is connected to the gas delivery channel 5, used for conveying the flue gas after preliminary denitration and raising the temperature by using the temperature of the flue gas in the first high-temperature gas chamber 10 and the second high-temperature gas chamber 11. The gas delivery box 9 is connected to the intake passage 8. In order to maintain the temperature of the flue gas that needs to undergo secondary denitration operation, the flue gas after preliminary denitration is transferred to the secondary gas delivery cavity 12 through the gas delivery channel 5. Then, during the conveyance of the flue gas in the secondary gas delivery cavity 12, by the working principle of heat exchange, the temperature of the high-temperature flue gas conveyed in the first high-temperature gas chamber 10 and the second high-temperature gas chamber 11 is used to raise the temperature of the secondary denitration gas conveyed in the secondary gas delivery cavity 12. Then, the heated secondary denitration gas is conveyed into the intake passage 8 and continues to be conveyed into the denitration tower 1 for denitration operation; A gas heating chamber 14 is provided at the top of the gas delivery box 9. The top of the first high-temperature gas chamber 10 extends into the gas heating chamber 14. An exhaust groove 15 is opened for communication between the top of the first high-temperature gas chamber 10 and the top of the gas delivery box 9. The top of the secondary gas delivery cavity 12 is connected to the gas heating chamber 14. During the conveyance of the secondary denitration gas in the secondary gas delivery cavity 12, the secondary denitration gas will enter the gas heating chamber 14. And the top of the first high-temperature gas chamber 10 is located in the gas heating chamber 14. The temperature of the high-temperature flue gas conveyed in the first high-temperature gas chamber 10 is used to maintain the temperature in the gas heating chamber 14. And the high-temperature gas discharged from the first high-temperature gas chamber 10 will be discharged into the intake passage 8 through the exhaust groove 15; A communication groove 16 is opened on one side of the exhaust groove 15, facilitating the secondary denitration gas discharged from the top of the secondary gas delivery cavity 12 to be discharged into the intake passage 8. After the secondary denitration gas conveyed in the secondary gas delivery cavity 12 enters the gas heating chamber 14, it can enter between multiple exhaust grooves 15 through the communication groove 16, enabling the secondary denitration gas to also enter the intake passage 8; 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 cavity 12. After the secondary denitrification gas is delivered into the gas heating chamber 14, the burner 17 heats the secondary denitrification gas sufficiently, enabling the secondary denitrification gas to maintain a sufficient temperature for subsequent denitrification operations. Additionally, temperature sensing devices are provided in the secondary gas delivery cavity 12, the high-temperature gas chamber I 10, and the high-temperature gas chamber II 11 to strictly monitor the actual temperatures of various gases and determine the actual temperatures during the transportation of different gases. The burner 17 is a known prior art device in the field, and the gas is directly heated by the flame ejected from the burner 17.

[0024] An air outlet trough body 18 is fixedly connected in the gas transmission channel 5. Two air outlet chambers 19 are provided on the air outlet trough body 18. An air outlet valve pipe 20 is connected between the air outlet chamber 19 and the air outlet trough body 18. One of the air outlet chambers 19 is connected to the secondary gas delivery 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, and the two air outlet chambers 19 can respectively direct the gas to the dust removal device 2 or the secondary gas delivery cavity 12.

[0025] A flue gas injection channel 21 is connected to the bottom of the high-temperature gas chamber I 10. An air outlet rotating cylinder 22 is rotatably arranged in the flue gas injection channel 21. An inlet groove 23 is provided on one side of the air outlet rotating cylinder 22. Air outlet structures are connected to both sides inside the air outlet rotating cylinder 22. An exhaust box body 24 is provided at the bottom of the high-temperature gas chamber II 11, and the exhaust box body 24 is connected to the air outlet structure. When it is necessary to transport high-temperature flue gas into the high-temperature gas chamber II 11 and heat the gas in the gas flow structure during the flow of the high-temperature gas in the high-temperature gas chamber II 11, the high-temperature gas chamber II 11 is connected to the intake channel 8. By driving the air outlet rotating cylinder 22 to rotate, the inlet groove 23 faces the incoming direction of the high-temperature flue gas in the flue gas injection channel 21, and the high-temperature flue gas will enter the air outlet rotating cylinder 22. Through the air outlet structure, the high-temperature flue gas is transported into the high-temperature gas chamber II 11, enabling the high-temperature flue gas to flow in the high-temperature gas chamber II 11; A gear box 32 is sleeved on the air outlet rotating cylinder 22. A transmission shaft 33 is rotatably connected to the gear box 32. The transmission shaft 33 is rotatably connected through the flue gas injection channel 21. A motor driving device 34 is provided on the flue gas injection channel 21, and the output end of the motor driving device 34 is fixedly connected to the transmission shaft 33. Starting the motor driving device 34 drives the transmission shaft 33 to rotate, and through the transmission effect between the transmission shaft 33 and the gear box 32, the air outlet rotating cylinder 22 is driven to rotate in the flue gas injection channel 21; Collection hopper bodies 35 are arranged on both sides of the air outlet rotary cylinder 22. The collection hopper bodies 35 are rotatably arranged inside the air outlet rotary cylinder 22. An air extraction device 36 is arranged outside the flue gas injection channel 21. A suction pipe 37 is connected between the air extraction device 36 and the collection hopper bodies 35. The suction pipe 37 is rotatably arranged inside the air outlet rotary cylinder 22. The air extraction device 36 is communicated with the exhaust gas box body 24. After the high-temperature flue gas enters the air outlet rotary cylinder 22, the air extraction device 36 is started to convey the high-temperature flue gas into the exhaust gas box body 24 through the collection hopper bodies 35 and the suction pipe 37. Finally, the high-temperature flue gas flows in the high-temperature gas chamber two 11. The air extraction device 36 is a technical device well-known to those skilled in the art, realizing the functions of extracting and conveying the flue gas.

[0026] The secondary gas conveying cavity 12 is set to be concave. A plurality of heat dissipation fins 25 are fixedly connected through the secondary gas conveying cavity 12. Both sides of the heat dissipation fins 25 are in contact with the high-temperature flue gas and the secondary denitrification gas respectively. The heat of the high-temperature flue gas is conducted into the secondary denitrification gas by using the heat exchange principle. By setting the outer shape of the secondary gas conveying cavity 12 to be concave, the contact area between the high-temperature flue gas and the secondary gas conveying cavity 12 can be increased.

[0027] A heat preservation sleeve 13 is sleeved outside the conveying pipeline 7. An exhaust valve pipe is communicated with the heat preservation sleeve 13 and is used for discharging the gas inside the heat preservation sleeve 13. A gas flow structure is arranged inside the high-temperature gas chamber two 11. The gas flow structure is communicated with the exhaust end of the second desulfurization tower 4 and is also communicated with the heat preservation sleeve 13, and is used for heating the flue gas to be secondarily desulfurized after the treated gas is heated. A sub-distribution pipeline is arranged at the exhaust end of the second desulfurization tower 4. The sub-distribution pipeline is communicated with the connecting cylinder body 27 located at the lower side, and the gas treated by the second desulfurization tower 4 is injected into the gas flow structure. Then the gas is heated by the high-temperature flue gas in the high-temperature gas chamber two 11, and after the gas is heated, it is injected into the heat preservation sleeve 13 to increase the temperature of the flue gas after preliminary desulfurization, so that the flue gas can efficiently perform the second desulfurization operation; The gas flow structure includes a gas flow pipeline 26 and a gas discharge box 28. The number of gas flow pipelines 26 is set to be multiple and they are all arranged in the second high-temperature gas chamber 11. Connecting cylinders 27 are connected between the tops and bottoms of the multiple gas flow pipelines 26. The connecting cylinder 27 located on the lower side is connected to the exhaust end of the second desulfurization tower 4. The gas discharge box 28 is fixedly connected through the intake passage 8. The connecting cylinder 27 located on the upper side is connected to the gas discharge box 28. The gas discharge box 28 is connected to the heat preservation sleeve 13. The gas that basically meets the emission standards discharged from the second desulfurization tower 4 is transported into the connecting cylinder 27 located on the lower side. The gas flows upward in the multiple gas flow pipelines 26, and then the high-temperature flue gas in the second high-temperature gas chamber 11 is used to increase the temperature of the gas in the gas flow pipeline 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 intake passage 8 to raise its own temperature. Then the heated gas is filled into the heat preservation sleeve 13, and then the gas is used to heat the flue gas transported in the transport pipeline 7.

[0028] A plurality of heat exchange grooves 29 are provided in the area of the gas discharge box 28 located inside the intake passage 8. By providing the plurality of heat exchange grooves 29, the contact area between the outer wall of the gas discharge box 28 and the high-temperature flue gas is further increased, so that the gas flowing in the gas discharge box 28 can raise its own temperature.

[0029] A liquid supply pipeline 30 is provided on the denitration tower 1. One side of the liquid supply pipeline 30 is connected to a plurality of storage tanks 31 for storing different denitration liquids. Even if the high-temperature flue gas and the burner 17 are used, it is difficult to raise the temperature of the gas that needs to be denitrified twice to the initial denitration temperature. For the slightly cooled gas that needs to be denitrified twice, targeted denitration liquid can be used. By injecting the denitration liquid in different storage tanks 31 into the liquid supply pipeline 30, the liquid supply pipeline 30 injects the denitration liquid into the spraying structure in the denitration tower 1, so that the denitration liquid is sprayed to denitrify the flue gas in the denitration tower 1.

[0030] The working principle of this high-temperature flue gas emission desulfurization and denitration device: Step 1: Primary denitration: Inject the high-temperature flue gas into the denitration tower 1 through the flue gas injection channel 21, the first high-temperature gas chamber 10 and the intake passage 8 for primary denitration operation; Step 2: Secondary denitration: Inject the flue gas discharged from the denitration tower 1 into the secondary gas transport cavity 12 through the air outlet trough body 18 and one of the air outlet chambers 19. Then, during the transportation of the flue gas into the secondary gas transport cavity 12, the high-temperature gas in the first high-temperature gas chamber 10 is used to heat the gas that needs to be denitrified twice. After the gas that needs to be denitrified twice is injected into the gas heating chamber 14, it continues to heat up under the action of the burner 17. Then the gas that needs to be denitrified twice is injected into the intake passage 8 and finally enters the denitration tower 1 for secondary denitration; Step 3, flue gas dust removal: The flue gas after secondary denitrification is transported to the dust removal device 2 through the gas transmission pipeline 6, and the dust removal operation of the flue gas is carried out in the dust removal device 2; Step 4, flue gas desulfurization: It is discharged into the first desulfurization tower 3 through the gas transmission pipeline 6, and then the primary desulfurization operation of the flue gas is carried out in the first desulfurization tower 3, and then the flue gas is transported to the second desulfurization tower 4 through the transport pipeline 7 for secondary desulfurization operation; Step 5, gas temperature increase: The gas that basically meets the emission standards discharged from the second desulfurization tower 4 is transported to the connecting cylinder 27 located below. The gas flows upward in the multiple gas flow pipelines 26, and then the high-temperature flue gas in the high-temperature gas chamber II 11 is used to increase the temperature of the gas in the gas flow pipelines 26, so that 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 intake passage 8 to increase its own temperature, and then the heated gas is filled into the heat preservation sleeve 13, and then the gas is used to increase the temperature of the flue gas transported in the transport pipeline 7.

[0031] The above are only the 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 principle of the present invention shall be included in the protection scope 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 passage (8), the top of the denitration tower (1) is connected to the air inlet passage (8), one side of the air inlet passage (8) is penetrated and fixedly connected to a gas delivery box (9), a high-temperature gas chamber 1 (10) and a high-temperature gas chamber 2 (11) are arranged in the gas delivery box (9), a secondary gas delivery chamber (12) is penetrated and 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 passage (5), and is used for transporting the flue gas after preliminary denitration, 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 passage (8); A heat-insulating sleeve (13) is provided on the outer side of the conveying pipeline (7), a gas flow structure is provided in the second high-temperature gas chamber (11), the gas flow structure is connected to the exhaust end of the second desulfurization tower (4), and the gas flow structure is connected to the heat-insulating sleeve (13) for heating the flue gas requiring secondary desulfurization using the treated gas after the temperature is increased.

2. A high-temperature flue gas emission desulfurization and denitrification device according to claim 1, characterized in that: A gas heating chamber (14) is arranged 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); the top of the secondary gas delivery chamber (12) is connected to the gas heating chamber (14).

3. A high-temperature flue gas emission 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 denitration gas discharged through the top of the secondary gas delivery cavity (12) to be discharged into the air intake channel (8).

4. A high-temperature flue gas emission 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. A high-temperature flue gas emission 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 arranged 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. A high-temperature flue gas emission desulfurization and denitrification device according to claim 1, characterized in that: The bottom of the high-temperature gas chamber one (10) is connected to a smoke injection channel (21), an exhaust drum (22) is rotatably arranged 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 arranged at the bottom of the high-temperature gas chamber two (11), and the exhaust box (24) is connected to the exhaust structure.

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

8. The high-temperature flue gas emission desulfurization and denitrification device according to claim 1, characterized in that: The gas flow structure comprises: a gas flow pipe (26), the number of the gas flow pipes (26) being set to be multiple and all being arranged in the second high-temperature gas chamber (11); a connecting cylinder (27) being connected between the top and the bottom of the multiple gas flow pipes (26); the connecting cylinder (27) located at the lower side being connected to the exhaust end of the second desulfurization tower (4); A gas discharge box (28) is connected to the gas inlet passage (8) through a fixed connection, the connecting cylinder (27) located on the upper side is connected to the gas discharge box (28), and the gas discharge box (28) is connected to the heat-insulating sleeve (13).

9. A high-temperature flue gas emission desulfurization and denitrification device according to claim 8, characterized in that: A plurality of heat exchange grooves (29) are provided in the area of ​​the gas discharge box (28) located inside the air inlet passage (8).

10. The high-temperature flue gas emission 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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