Coke oven for flue gas denitration treatment

Abstract

The utility model relates to a coke oven for flue gas denitration treatment belongs to coal processing technical field, the coke oven for flue gas denitration treatment, including furnace body, the chimney and its one side intercommunication's medicament tank are provided with on the top of furnace body, the linkage mechanism is linked with through exhaust device at the bottom of furnace body, one end of linkage mechanism is linked with the medicament ration filling mechanism that stretches into the medicament tank, the other end of linkage mechanism is linked with the carbon prying mechanism that stretches into the furnace body, the beneficial effect of the utility model is, the coke prying of linkage can be completed when the utility model is in flue gas denitration treatment, improves coke quality, and reciprocating ration unloading of medicament in medicament tank is controlled simultaneously, and the degree of automation is higher without manual repeated addition medicament denitration.

Description

Technical Field

[0001] This invention relates to the field of coal processing technology, and in particular to a coking oven for flue gas denitrification treatment. Background Technology

[0002] A coke oven is a furnace typically constructed of refractory bricks and blocks, used to convert coal into coke. It is a kiln for producing coke from coal and is the main thermal equipment in coking. A modern coke oven is a horizontal chamber coke oven primarily used for producing metallurgical coke and capable of recovering coking chemical products. It consists of the oven body and auxiliary equipment. The coke oven body comprises the oven roof, combustion chamber, carbonization chamber, inclined flue, regenerator, etc., connected by chimneys. The entire coke oven is built on a concrete foundation. While the basic structure of modern coke ovens is largely the same, they can be further classified into many types due to differences in coal charging methods, heating methods, and the fuels used.

[0003] Traditional coking ovens mainly include horizontal and vertical types, each with its own characteristics. Horizontal coking ovens have a large footprint, high investment costs, and coal cakes that are 3-4 meters wide. This excessively wide carbonization chamber severely affects heat transfer, resulting in prolonged coking time. Furthermore, they often use direct heating, leading to the combustion of 1.5-4% of the coal and coke to supplement the heat required for coal dry distillation, thus reducing production capacity. Vertical coking ovens, also known as vertical heat recovery coking ovens, cannot provide sufficient heat for coal dry distillation when the volatile matter content of the blended coal is low. Additional coal gas is needed for supplementary combustion, resulting in low heating efficiency. Moreover, the varying amounts of raw coal gas produced due to the different coking stages in different carbonization chambers lead to uneven heating and a longer coking time.

[0004] Nitrogen oxides (NOx) are gases produced during combustion processes due to the oxidation of nitrogen. They not only irritate the human respiratory system, damage plants and animals, and deplete the ozone layer, but are also major contributors to the greenhouse effect, acid rain, and photochemical reactions. The combustion reaction during coke production in coke ovens generates large amounts of exhaust gases. Due to the complex composition of the fuel, containing nitrogen and sulfur, combustion emits significant amounts of nitrogen oxides, sulfides, and particulate matter, polluting the environment and harming human health. Currently, the treatment of nitrogen oxides in combustion flue gas typically involves injecting ammonia into the chimney to react with the nitrogen oxides, thereby reducing their concentration. However, insufficient ammonia leads to high nitrogen oxide levels, while excessive ammonia increases treatment costs. Therefore, current methods for treating nitrogen oxides suffer from poor control over ammonia injection volume.

[0005] For example, patent CN211585959U discloses a denitrification reactor specifically for coke oven exhaust gas, including a base, with a reactor body fixedly installed at the top of the base. The reactor body has a flue gas inlet at the bottom of its front side and a flue gas outlet at the top of its front side. A drive motor is installed inside the base. This denitrification reactor for coke oven exhaust gas, through the arrangement of a drive column, reaction plate, reaction column, moving sleeve, denitrification plate, internal gear ring, and external gear ring, allows the coke oven exhaust gas to enter the reactor body through the flue gas inlet during denitrification. Under the action of a fan, the coke oven exhaust gas passes through the reaction plate and enters the denitrification chamber formed by the denitrification plate and reaction column. At this time, the drive motor is started to rotate the drive plate, and the drive column rotates accordingly, causing the reaction plate to rotate as well. This design offers advantages such as high desulfurization efficiency, solving the problem of low desulfurization efficiency in existing systems. However, the aforementioned denitrification devices cannot reasonably control the dosage of denitrification agent (ammonia injection), and the denitrification process consumes a large amount of energy, resulting in high denitrification costs. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides a coking oven for flue gas denitrification treatment. During flue gas denitrification treatment, the exhaust gas can be used to move the coke, improving coke quality. Simultaneously, the reagents in the reagent tank are fed back and forth in a quantitative manner, eliminating the need for manual repeated addition of reagents for denitrification and achieving a higher degree of automation.

[0007] To achieve the above objectives, the technical solution adopted by the present invention to solve its technical problem is as follows: the coking oven for flue gas denitrification treatment includes a furnace body, a chimney is provided on the top of the furnace body and a reagent tank connected to one side thereon, the bottom of the furnace body is connected to a linkage mechanism through an exhaust device, one end of the linkage mechanism is connected to a reagent metering and dispensing mechanism that extends into the reagent tank, and the other end of the linkage mechanism is connected to a carbon removal mechanism that extends into the furnace body.

[0008] The exhaust device includes a flue gas treatment chamber located on one side of the furnace body. The flue gas treatment chamber is connected to the furnace body. An induced draft fan is installed at the bottom of the flue gas treatment chamber. The induced draft fan is connected to the linkage mechanism through an exhaust pipe. A duct is installed through the bottom of the furnace body. The outlet of the induced draft fan is connected to the exhaust pipe through the duct.

[0009] A heat exchange assembly is installed on the upper part of the flue gas treatment chamber. The air inlet of the heat exchange assembly is connected to the furnace body, and the heat exchange outlet of the heat exchange assembly is connected to the furnace body through a fuel pipe.

[0010] The bottom of the furnace body is provided with a guide plate to guide the combustion medium gas, and one side of the guide plate is connected to the flue gas treatment chamber through a connecting pipe.

[0011] The linkage mechanism includes a bellows fixed to one side of the chimney and a rotating assembly that runs vertically through the bellows. One end of the bellows is connected to the exhaust pipe, and the other end of the bellows is connected to the chimney. One end of the rotating assembly extends into the inner wall of the furnace and is connected to the charcoal removal mechanism, and the other end of the rotating assembly is connected to the reagent metering mechanism.

[0012] The rotating assembly includes a linkage shaft that runs vertically through the air box and a turn wheel disposed inside the air box. The turn wheel is fixed on the linkage shaft. One end of the linkage shaft is connected to the drug dispensing mechanism, and the other end of the linkage shaft is connected to the charcoal removal mechanism.

[0013] A drug outlet connected to the drug tank is provided on one side of the chimney, and a drug metering mechanism that periodically seals the drug outlet is rotatably connected inside the drug tank.

[0014] The drug dispensing mechanism includes a drive shaft rotatably connected inside the drug tank. The drive shaft is connected to the linkage mechanism. The drive shaft has an outward protrusion in the middle. The outward protrusion is rotatably connected to the middle of the rotating plate via a connecting rod. One end of the rotating plate is rotatably connected to the inner wall of the drug tank. One side of the rotating plate is sealed to the drug outlet via a sealing plate.

[0015] The upper part of the furnace body is provided with a carbonization chamber and a combustion chamber, and the lower part of the furnace body is provided with a heat storage chamber. The combustion chamber and the heat storage chamber are connected by an inclined section.

[0016] The coal-removing mechanism includes a support plate that reciprocates and slides within the carbonization chamber to support coal and a rotating shaft installed in the inclined section. One end of the rotating shaft is connected to the linkage mechanism via a bevel gear transmission mechanism, and the other end of the rotating shaft is fixed with a rotating roller. The surface of the rotating roller is provided with a bent guide groove. The lower end of the support plate is fixed with a fixing rod and a plurality of spaced-apart pull rods. The fixing rod is slidably connected to the guide groove.

[0017] The chimney is provided with filter plate I, filter plate II and filter plate III arranged sequentially from bottom to top. A movable plate assembly is provided between filter plate II and filter plate III. A smoke exhaust port is provided at the top of the chimney. The movable plate assembly and filter plate III are provided above the agent exhaust port. Filter plate I and filter plate II are provided below the agent exhaust port. The lower part of filter plate I is connected to the linkage mechanism.

[0018] The beneficial effects of this invention are:

[0019] 1. This invention provides a coking oven for flue gas denitrification treatment. By using the exhaust gas discharged from the oven body to drive the linkage mechanism, the agent quantitative injection mechanism and the coke scraping mechanism are driven to move synchronously to complete the scraping of coke and improve the quality of coke. At the same time, the denitrification agent in the agent tank is reciprocated and quantitatively fed, eliminating the need for manual repeated addition of agent for denitrification. This results in a higher degree of automation, lower energy consumption, and lower denitrification cost.

[0020] 2. This invention recovers and utilizes the waste heat from the combustion exhaust gas through a heat exchange component and introduces it into the fuel pipe for heating. This effectively avoids the waste of raw materials due to incomplete combustion caused by the initial low temperature of the combustion medium, ensuring complete combustion of the fuel. Furthermore, this invention features a pair of movable plates installed on the upper part of the chimney's inner wall. When the thrust generated by the rising exhaust gas in the chimney exceeds the force of the movable plates naturally hanging and adhering, the plates open, putting the chimney in an open state, thus completing the exhaust gas discharge. In the closed state, the exhaust gas can fully mix with the reagents on the filter plates for denitrification treatment, resulting in better denitrification effect and a simpler and more convenient structure. Attached Figure Description

[0021] The following is a brief explanation of the contents of each of the accompanying drawings and the markings in the drawings:

[0022] Figure 1 This is an isometric view of the coking oven of the present invention;

[0023] Figure 2 This is a schematic diagram of the internal structure of the coking furnace of the present invention;

[0024] Figure 3 For the present invention Figure 2 Enlarged view of point A;

[0025] Figure 4 For the present invention Figure 2 Enlarged view of point B;

[0026] Figure 5 For the present invention Figure 2 Enlarged view of point C;

[0027] Figure 6 For the present invention Figure 2 Enlarged view of point D;

[0028] Figure 7 For the present invention Figure 2 Enlarged view of point E;

[0029] Figure 8 This is a schematic diagram of the drug dispensing mechanism of the present invention;

[0030] The markings in the above figures are as follows: 1. Furnace body, 11. Carbonization chamber, 12. Combustion chamber, 13. Regenerator, 14. Inclined section, 15. Coal feed inlet, 2. Chimney, 21. Chemical discharge outlet, 22. Filter plate I, 23. Filter plate II, 24. Filter plate III, 25. Movable plate assembly, 26. Flue gas outlet, 3. Chemical tank, 4. Exhaust device, 41. Flue gas treatment chamber, 42. Exhaust fan, 43. Pipe, 44. Exhaust pipe, 45. Heat exchange assembly, 5. 51. Linkage mechanism, 52. Air box, 53. Linkage shaft, 54. Actuating wheel, 55. Smoke vent, 6. Chemical metering and dispensing mechanism, 61. Drive shaft, 62. Outward protrusion section, 63. Connecting rod, 64. Rotating plate, 65. Sealing plate, 7. Coal scraping mechanism, 71. Bearing plate, 72. Rotating shaft, 73. Bevel gear transmission mechanism, 74. Rotating roller, 741. Guide groove, 75. Fixed rod, 76. Pull rod, 8. Fuel pipe, 9. Guide plate, 10. Connecting pipe. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0032] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0033] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] The specific embodiments of the present invention are as follows: Figures 1 to 8As shown, this invention provides a coking oven for flue gas denitrification treatment, including a furnace body 1. A chimney 2 is installed at the top of the furnace body 1, and a reagent tank 3 connected to one side thereof. The chimney 2 collects flue gas, and the reagent tank 3 contains denitrification reagents. The reagents enter the chimney 2 through the reagent tank 3 and react fully with the flue gas in the chimney 2 to complete the denitrification treatment of the flue gas. The bottom of the furnace body 1 is connected to a linkage mechanism 5 via an exhaust device 4. One end of the linkage mechanism 5 is connected to a reagent metering and dispensing mechanism 6 extending into the reagent tank 3, and the other end of the linkage mechanism 5 is connected to a coke-removing mechanism 7 extending into the furnace body 1. By using the exhaust gas discharged from the furnace body 1 to drive the linkage mechanism 5, the reagent metering and dispensing mechanism 6 and the coke-removing mechanism 7 are driven to operate synchronously to remove coke, improving coke quality. Simultaneously, the linkage control of the reciprocating metered dispensing of denitrification reagents in the reagent tank 3 eliminates the need for manual repeated addition of reagents for denitrification, resulting in higher automation, lower energy consumption, and lower denitrification costs.

[0035] Specifically, the exhaust device 4 includes a flue gas treatment chamber 41 located on one side of the furnace body 1. The flue gas treatment chamber 41 is connected to the furnace body 1. A guide plate 9 is installed at the bottom of the furnace body 1 to guide the combustion medium gas. A conical hole is provided in the middle of the guide plate 9, and a connecting pipe 10 connected to the conical hole is installed on one side of the guide plate 9. The outer end of the connecting pipe 10 is connected to the flue gas treatment chamber 41. An induced draft fan 42 is installed at the bottom of the flue gas treatment chamber 41. A duct 43 is installed through the bottom of the furnace body 1. The outlet of the induced draft fan 42 is connected to an exhaust pipe 44 through the duct 43. The exhaust pipe 44 is connected to a linkage mechanism 5. When the induced draft fan 42 operates, it sequentially introduces the cooled flue gas from the furnace body 1 through the duct 43 and the exhaust pipe 44 into the linkage mechanism 5, thereby driving the linkage mechanism 5 to discharge the flue gas into the chimney 2. Simultaneously, it drives the quantitative addition mechanism 6 and the coke-moving mechanism 7 to operate synchronously, thereby simultaneously completing the quantitative addition of the denitrification agent and the coke-moving action.

[0036] In addition, a heat exchange component 45 is installed on the upper part of the flue gas treatment chamber 41. The heat exchange component 45 can be configured as a heat pipe waste heat recovery device. The air inlet of the heat exchange component 45 is connected to the furnace body 1, and the heat exchange outlet of the heat exchange component 45 is connected to the furnace body 1 through the fuel pipe 8. The waste heat recovered from the furnace body 1 enters the fuel pipe 8, which can preheat the combustion medium entering the furnace body 1. This can effectively prevent the combustion medium that has just been introduced from sinking and leaking due to its low temperature, thus avoiding waste of raw materials caused by incomplete combustion.

[0037] Specifically, the linkage mechanism 5 includes a bellows 51 fixed to one side of the chimney 2 and a rotating assembly extending vertically through the bellows 51. One end of the bellows 51 is connected to the exhaust pipe 44, and the other end of the bellows 51 extends into the chimney 2. A flue gas outlet 26 is provided at the end of the bellows 51 extending into the chimney 2, thus connecting the bellows 51 to the chimney 2 for smooth flue gas exhaust. One end of the rotating assembly extends into the inner wall of the furnace body 1 and is connected to the charcoal scraping mechanism 7. The other end of the rotating assembly is connected to the reagent metering mechanism 6. The rotating assembly can synchronously drive the charcoal scraping mechanism 7 and the reagent metering mechanism 6.

[0038] The rotating components include a linkage shaft 52 that runs vertically through the bellows 51 and a lever 53 installed inside the bellows 51. A bearing is installed at the connection between the linkage shaft 52 and the bellows 51 to ensure smooth rotation of the linkage shaft 52. The lever 53 is fixed to the linkage shaft 52 and has multiple actuating plates spaced along its circumference. One end of the linkage shaft 52 is connected to the reagent metering mechanism 6, and the other end is connected to the charcoal removal mechanism 7. When the induced draft fan 42 operates, it sequentially introduces the cooled flue gas from the furnace body 1 into the bellows 51 through the duct 43 and exhaust pipe 44, causing the lever 53 inside the bellows 51 to rotate, thereby driving the linkage shaft 52 to rotate. The linkage shaft 52 can simultaneously drive the charcoal removal mechanism 7 and the reagent metering mechanism 6.

[0039] Specifically, one side of the chimney 2 is provided with a reagent outlet 21 that communicates with the reagent tank 3. The bottom of the reagent tank 3 is provided with an inclined surface, which allows the denitrification reagent inside to flow to the reagent outlet 21 and thus enter the chimney 2. A reagent metering mechanism 6 is rotatably connected inside the reagent tank 3 to periodically seal the reagent outlet 21. The reagent metering mechanism 6 includes a drive shaft 61 rotatably connected to the reagent tank 3 via bearings. The drive shaft 61 is connected to the linkage shaft 52 of the linkage mechanism 5 via a coupling. The middle of the drive shaft 61 is provided with an outwardly protruding section 62. The middle of the outwardly protruding section 62 is sleeved and connected to one end of the connecting rod 63. The other end of the connecting rod 63 is rotatably connected to the middle of the rotating plate 64. One end of the rotating plate 64 is rotatably connected to the inner wall of the reagent tank 3. One side of the rotating plate 64 is sealed to the reagent outlet 21 via a sealing plate 65. The rotation of the linkage shaft 52 of the linkage mechanism 5 can drive the drive shaft 61 to rotate. The drive shaft 61 drives the connecting rod 63 to swing, thereby causing the rotating plate 64 to move away from or closer to the agent outlet 21. One rotation of the drive shaft 61 can drive the rotating plate 64 to deflect one rotation, thereby realizing the reciprocating opening and closing of the agent outlet 21. When the induced draft fan 42 has a constant air volume, the rotation speed of the linkage shaft 52 is constant. Therefore, the reciprocating opening and closing cycle of the agent outlet 21 is constant, which can make the agent in the agent tank 3 fall into the chimney 2 in a quantitative manner and react with the flue gas in the chimney 2 to undergo a denitrification reaction.

[0040] Specifically, the upper part of the furnace body 1 is provided with a heat-conducting plate, which divides the furnace body 1 into a carbonization chamber 11 and a combustion chamber 12. The furnace body 1 is provided with a coal feed inlet 15 that communicates with the carbonization chamber 11. The lower part of the furnace body 1 is provided with a heat storage chamber 13. The combustion chamber 12 and the heat storage chamber 13 are connected by an inclined section 14. The coal-scraping mechanism 7 includes a support plate 71 that slides back and forth in the carbonization chamber 11 to support the coal and a rotating shaft 72 installed in the inclined section 14. The upper surface of the support plate 71 is inclined to both sides, so that the coal falling on the upper end will naturally fall to both sides. One end of the rotating shaft 72 is connected to the linkage shaft 52 of the linkage mechanism 5 through a bevel gear transmission mechanism 73. The other end of the rotating shaft 72 is fixed with a rotating roller 74. The surface of the rotating roller 74 is provided with a bent guide groove 741. The lower end of the support plate 71 is fixed with a fixed rod 75 and a number of spaced pull rods 76. The fixed rod 75 is slidably connected to the guide groove 741 to realize the reciprocating action of the support plate 71 and the pull rods 76 at its lower end to scrape the coal and improve the completeness of combustion. The linkage shaft 52 of the linkage mechanism 5 rotates, which drives the rotating shaft 72 and the rotating roller 74 to rotate synchronously through the bevel gear transmission mechanism 73. This causes the fixed rod 75 to move back and forth along the guide groove 741 on the surface of the rotating roller 74, and causes the bearing plate 71 fixed to the fixed rod 75 to slide back and forth along the inner wall of the furnace body 1. This causes the pull rod 76 to pry up the falling coal, so that it burns more completely and improves the quality of coke.

[0041] Specifically, the chimney 2 is equipped with filter plate I 22, filter plate II 23, and filter plate III 24 arranged sequentially from bottom to top. A pair of movable plate assemblies 25 are arranged between filter plate II 23 and filter plate III 24. A smoke exhaust port 26 is located at the top of the chimney 2. The movable plate assemblies 25 and filter plate III 24 are arranged above the agent exhaust port 21, while filter plate I 22 and filter plate II 23 are arranged below the agent exhaust port 21. The lower part of filter plate I 22 is connected to the upper air box 51 of the linkage mechanism 5. The movable plate assembly 25 includes two movable plates, one end of which is connected to the inner wall of the chimney 2 via a pivot and a torsion spring. When the two movable plates contact each other, they form an "eaves" shape. After the flue gas enters the wind box 51, it will flow into the chimney 2 through the exhaust port 54 at one end. During the upward process, it will be filtered by filter plate I 22 and filter plate II 23 and react with the falling agent to complete the denitrification treatment. The movable plate group 25 above will open when the total amount of gas collected is greater than its weight and it is in contact with the filter plate. Finally, it will be filtered and discharged after passing through filter plate III 24 and discharged from the exhaust port 26 above the chimney 2.

[0042] The working principle of the coking oven used for flue gas denitrification is as follows:

[0043] When using this coking oven, the coal to be smelted is first injected through the coal feed inlet 15. When the coal is injected, it falls onto the support plate 71. Since the upper surface of the support plate 71 is inclined to both sides, the coal falling on the upper end will naturally fall to both sides. At this time, the coal feed inlet 15 is closed, and combustion medium such as fuel gas is introduced into the combustion chamber 12 on one side of the heat conduction plate. The combustion medium is then ignited. The high temperature heat generated during the combustion of the medium will be conducted by the heat conduction plate to the carbonization chamber 11 where the coal is piled up to complete the heating, so that it is heated to form coke.

[0044] At this time, the combustion medium gas will flow downward from the inclined section 14, enter the connecting pipe 10 through the hole in the upper end of the guide plate 9, and then enter the heat exchange component 45. The heat exchange component 45 performs waste heat recovery. The recovered waste heat heats the air medium at the upper end to preheat it and injects it into the combustion medium. At this time, it is introduced into the combustion pipe to heat it up. This can effectively avoid the combustion medium that has just been introduced being too cold, causing it to sink and leak, resulting in incomplete combustion and waste of raw materials. The cooled flue gas is blown into the duct 43 by the induced draft fan 42 and discharged into the wind box 51 through the exhaust pipe 44. At this time, the impact force caused by a large amount of gas during the exhaust process will drive the actuating wheel 53 to rotate, causing the linkage shaft 52 connected to the actuating wheel 53 to rotate. The linkage shaft 52 drives the rotating shaft 72 to rotate through the bevel gear transmission mechanism 73, which in turn drives the rotating roller 74 to rotate. This causes the fixed rod 75 to move back and forth along the guide groove 741 on the surface of the rotating roller 74, thereby causing the bearing plate 71 fixed to the fixed rod 75 to slide back and forth along the inner wall of the furnace body 1. This causes the pull rod 76 to pull the falling coal, making it burn more completely and improving the quality of coke.

[0045] Simultaneously, the rotation of the linkage shaft 52 drives the upper drive shaft 61 to rotate, which in turn drives the connecting rod 63 to swing, thereby causing the rotating plate 64 to move away from or closer to the agent discharge port 21. One rotation of the drive shaft 61 causes the rotating plate 64 to deflect one revolution, thus achieving the reciprocating opening and closing of the agent discharge port 21. With a constant induced draft from the fan 42, the rotation speed of the linkage shaft 52 remains constant. Therefore, the reciprocating opening and closing cycle of the agent discharge port 21 is constant, allowing the agent in the agent tank 3 to fall quantitatively onto the filter plate II 23 inside the chimney 2. At the same time, flue gas enters the chimney 2 through the wind box 51, and after being filtered by the filter plate I 22, rises to the filter plate II 23, where it reacts with the agent to complete the denitrification treatment. The reacted flue gas continues to rise, and when the total amount of gas collected exceeds the combined weight of the two movable plates, the opening action is completed, finally completing the filtration and discharge, exiting through the exhaust port 26 above the chimney 2.

[0046] In summary, this invention utilizes the emitted waste gas to move the coke during flue gas denitrification, improving coke quality. Simultaneously, it controls the reciprocating quantitative feeding of reagents in the reagent tank, eliminating the need for manual repeated addition of reagents for denitrification and achieving a higher degree of automation.

[0047] The above description is merely an illustration of some principles of the present invention. This specification is not intended to limit the present invention to the specific structures and applicable scope shown. Therefore, all possible modifications and equivalents that may be used fall within the scope of the patent application of this invention.

Claims

1. A coking oven for flue gas denitrification treatment, characterized in that, The furnace includes a furnace body, a chimney on the top of the furnace body and a chemical tank connected to one side thereon, and a linkage mechanism at the bottom of the furnace body through an exhaust device. One end of the linkage mechanism is connected to a chemical metering and dispensing mechanism that extends into the chemical tank, and the other end of the linkage mechanism is connected to a charcoal scraping mechanism that extends into the furnace body. The exhaust device includes a flue gas treatment chamber located on one side of the furnace body, which is connected to the furnace body. An induced draft fan is installed at the bottom of the flue gas treatment chamber, and the induced draft fan is connected to the linkage mechanism through an exhaust pipe. A duct is installed through the bottom of the furnace body, and the outlet of the induced draft fan is connected to the exhaust pipe through the duct. The linkage mechanism includes a bellows fixed to one side of the chimney and a rotating assembly that runs vertically through the bellows. One end of the bellows is connected to the exhaust pipe, and the other end of the bellows is connected to the chimney. One end of the rotating assembly extends into the inner wall of the furnace and is connected to the charcoal removal mechanism, and the other end of the rotating assembly is connected to the reagent metering mechanism. The rotating assembly includes a linkage shaft that runs vertically through the air box and a turn wheel disposed inside the air box. The turn wheel is fixed on the linkage shaft. One end of the linkage shaft is connected to the drug dispensing mechanism, and the other end of the linkage shaft is connected to the charcoal removal mechanism.

2. The coking oven for flue gas denitrification treatment according to claim 1, characterized in that: A heat exchange assembly is installed on the upper part of the flue gas treatment chamber. The air inlet of the heat exchange assembly is connected to the furnace body, and the heat exchange outlet of the heat exchange assembly is connected to the furnace body through a fuel pipe.

3. The coking oven for flue gas denitrification treatment according to claim 1, characterized in that: The bottom of the furnace body is provided with a guide plate to guide the combustion medium gas, and one side of the guide plate is connected to the flue gas treatment chamber through a connecting pipe.

4. The coking oven for flue gas denitrification treatment according to claim 1, characterized in that: A drug outlet connected to the drug tank is provided on one side of the chimney, and a drug metering mechanism that periodically seals the drug outlet is rotatably connected inside the drug tank.

5. The coking oven for flue gas denitrification treatment according to claim 4, characterized in that: The drug dispensing mechanism includes a drive shaft rotatably connected inside the drug tank. The drive shaft is connected to the linkage mechanism. The drive shaft has an outward protrusion in the middle. The outward protrusion is rotatably connected to the middle of the rotating plate via a connecting rod. One end of the rotating plate is rotatably connected to the inner wall of the drug tank. One side of the rotating plate is sealed to the drug outlet via a sealing plate.

6. The coking oven for flue gas denitrification treatment according to claim 4, characterized in that: The upper part of the furnace body is provided with a carbonization chamber and a combustion chamber, and the lower part of the furnace body is provided with a heat storage chamber. The combustion chamber and the heat storage chamber are connected by an inclined section. The coal-removing mechanism includes a support plate that reciprocates and slides within the carbonization chamber to support coal and a rotating shaft installed in the inclined section. One end of the rotating shaft is connected to the linkage mechanism via a bevel gear transmission mechanism, and the other end of the rotating shaft is fixed with a rotating roller. The surface of the rotating roller is provided with a bent guide groove. The lower end of the support plate is fixed with a fixing rod and a plurality of spaced-apart pull rods. The fixing rod is slidably connected to the guide groove.

7. The coking oven for flue gas denitrification treatment according to claim 4, characterized in that: The chimney is provided with filter plate I, filter plate II and filter plate III arranged sequentially from bottom to top. A movable plate assembly is provided between filter plate II and filter plate III. A smoke exhaust port is provided at the top of the chimney. The movable plate assembly and filter plate III are provided above the agent exhaust port. Filter plate I and filter plate II are provided below the agent exhaust port. The lower part of filter plate I is connected to the linkage mechanism.

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