Process device for removing co from dry quenching circulating gas emission flue gas

Abstract

The utility model relates to the technical field of dry quenching energy saving and environmental protection in coking industry, specifically relates to a kind of dry quenching circulating gas diffusion flue gas CO removal process device, including flue gas dust removal pipe, the top inside of flue gas dust removal pipe is fixed with screening board, the bottom of screening board is provided with multiple groups of mounting plate, the inside of its each group mounting plate is fixed with inclined plate, the bottom end of inclined plate is fixedly connected with bottom column by support rod, multiple groups of side holes are opened on the lateral wall of flue gas dust removal pipe, and then end keeps intercommunication with coke oven basement by pressurizing fan, the tail end of coke oven basement is introduced into combustion chamber, the flue gas of combustion chamber keeps intercommunication with flue gas desulfurization and denitrification secondary dust removal device by pipeline, by introducing CO in dry quenching circulating gas diffusion flue gas into coke oven heating system combustion treatment, not only CO and other pollution gases can be removed, and treated waste gas is discharged up to standard, energy saving and environmental protection double benefits can be realized, and pressurizing fan provides conveying power for diffusion flue gas and balances coke oven heating system pressure.

Description

Technical Field

[0001] This utility model relates to the field of energy-saving and environmental protection technology in the dry quenching coke industry, specifically to a CO removal process device for the circulating gas emission flue gas in dry quenching coke. Background Technology

[0002] In the coking process of the coking industry, to facilitate the storage and transportation of coke, it is necessary to cool the red-hot coke (1000±50℃) to room temperature. Two common methods are wet and dry quenching. With increasingly stringent environmental protection requirements, dry quenching equipment has become widely adopted and promoted. During operation, the red-hot coke (approximately 1000℃) exchanges heat with the circulating gas (mainly nitrogen). During this process, a series of chemical reactions occur, leading to a continuous increase in the combustible components in the circulating gas. Simultaneously, the secondary pyrolysis of the red-hot coke in the dry quenching furnace also releases combustible gases such as H2 and CO. To ensure stable and safe operation of the equipment, air introduction is often used to burn off these combustible gases, controlling the CO concentration at 4%~6% and the H2 concentration at <3%. During this process, the amount of circulating gas in the system increases, requiring the venting of some circulating gas and the replenishment of some nitrogen to maintain the safe and stable operation of the system. Typically, the amount of vented gas is about 10% of the total circulating volume. The venting volume of a single dry quenching unit with different processing capacities in China ranges from 10,000 to 30,000 Nm3 / h, and the vented flue gas contains pollutants such as dust, SO2, and CO.

[0003] Existing environmental protection processes can remove dust and SO2, but cannot remove CO. High concentrations of CO directly emitted into the atmosphere not only participate in the formation of photochemical smog, causing environmental pollution, but also endanger human health. Utility Model Content

[0004] Technical problems to be solved

[0005] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a CO removal process device for dry quenching coke circulating gas venting flue gas, which can effectively solve the problems in the existing technology.

[0006] Technical solution

[0007] This utility model provides a CO removal process device for dry quenching coke circulating gas venting flue gas, including a flue gas dust removal pipe. A screening plate is fixed inside the top of the flue gas dust removal pipe. Multiple sets of mounting plates are arranged at the bottom of the screening plate, and an inclined plate is fixed inside each set of mounting plates. The bottom end of the inclined plate is fixedly connected to a base column via a support rod. Multiple sets of side holes are opened on the side wall of the flue gas dust removal pipe, and an outer plate is fixed to the outside of the flue gas dust removal pipe at this location. A wet dust removal assembly is arranged at the top of the outer plate. The wet dust removal assembly includes a nozzle inserted into a side hole, a mounting bracket fixedly connected to the nozzle, and a sealing plate covering the outside of the mounting bracket. The outside of each set of sealing plates is kept connected through a water inlet pipe. The front end of the flue gas dust removal pipe is kept connected to the circulating gas vent pipe and the pre-storage chamber vent pipe through the main pipe, while the rear end is kept connected to the coke oven basement through a pressurized fan. The tail end of the coke oven basement is connected to the combustion chamber. The flue gas in the combustion chamber is kept connected to the flue gas desulfurization and denitrification secondary dust removal device through a pipe.

[0008] Furthermore, multiple sets of inclined plates are arranged in a circular array within the mounting plate, and the spacing between the inclined plate structures within the multiple sets of mounting plate structures in the flue gas dust removal pipe gradually narrows from top to bottom.

[0009] Furthermore, the linear array of screening plates is provided in multiple groups, and the vertical cross-section of each group of screening plates is wavy.

[0010] Furthermore, multiple sets of water supply pipes are arranged in an equidistant array on the sealing plate, and a water inlet is provided on the outer side of each set of sealing plates. The sealing plates are fixed to the side wall of the flue gas dust removal pipe by bolts.

[0011] Furthermore, the mounting bracket has multiple sets of holes pre-drilled, and each set of nozzles is fixedly connected to each hole.

[0012] Furthermore, the tail end of the flue gas desulfurization, denitrification, and secondary dust removal device is connected to the external environment through an on / off switch, and the tail end of the pressurized blower is connected to the combustion chamber through an exhaust gas on / off valve structure.

[0013] Beneficial effects

[0014] In this invention, CO in the flue gas released from the dry quenching circulating gas is introduced into the coke oven heating system for combustion treatment. This not only removes polluting gases such as CO and ensures that the treated exhaust gas meets emission standards, but also reduces the heat source required for coke oven heating, achieving dual benefits of energy saving and environmental protection. The pressurizing fan provides the conveying power for the flue gas and balances the pressure of the coke oven heating system.

[0015] In this device, a three-stage dust removal structure consisting of a screening plate, inclined plates, and wet dust collector achieves precise interception and removal of dust from flue gas. The linear array of wave-shaped screening plates initially blocks large dust particles, while the wave-shaped structure extends the residence time of the flue gas, improving interception efficiency. The inclined plates are arranged in a ring array within the mounting plate, with the spacing gradually narrowing from top to bottom, allowing for secondary filtration of medium-sized dust particles. The gradually changing spacing design adapts to the separation requirements of dust particles of different sizes, preventing dust blockage while improving filtration accuracy. The wet dust collector sprays water mist into the flue gas through nozzles, deeply adsorbing fine dust particles. After the water mist fully contacts the flue gas, the dust is discharged with the water flow, further reducing the dust content in the flue gas. The synergistic effect of the three-stage dust removal significantly reduces the dust concentration in the flue gas, laying a solid foundation for subsequent CO removal, desulfurization, and denitrification processes. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a cross-sectional view of the structure of this utility model;

[0019] Figure 3 This is a cross-sectional exploded view of the present invention;

[0020] Figure 4 This is a structural block diagram of the present invention.

[0021] The labels in the diagram represent: 1. Flue gas dust removal pipe; 11. Mounting plate; 12. Inclined plate; 13. Support rod; 14. Base column; 15. Outer plate; 16. Side hole; 2. Wet dust removal assembly; 21. Sealing plate; 22. Mounting frame; 23. Nozzle; 24. Water supply pipe; 3. Screening plate; 4. Circulating gas vent pipe; 5. Pre-storage chamber vent pipe; 6. Main pipeline; 7. Pressurized fan; 8. Coke oven basement; 9. Combustion chamber; 10. Flue gas desulfurization, denitrification, and secondary dust removal device; 101. Opening and closing device. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0023] The present invention will be further described below with reference to the embodiments.

[0024] Example: A CO removal process device for dry quenching circulating gas venting flue gas, refer to the attached document. Figure 1 - Appendix Figure 4 The system includes a flue gas dust removal pipe 1, with a screening plate 3 fixed inside the top of the flue gas dust removal pipe 1. Multiple sets of mounting plates 11 are provided at the bottom of the screening plate 3, and an inclined plate 12 is fixed inside each set of mounting plates 11. The bottom end of the inclined plate 12 is fixedly connected to a base column 14 via a support rod 13. Multiple sets of side holes 16 are opened on the side wall of the flue gas dust removal pipe 1, and an outer plate 15 is fixed to the outside of the flue gas dust removal pipe 1 at this location. A wet dust removal assembly 2 is provided at the top of the outer plate 15, and the wet dust removal assembly 2 includes components inserted into the side holes 16. The nozzle 23 inside, the mounting bracket 22 fixedly connected to the nozzle 23, and the sealing plate 21 covering the outside of the mounting bracket 22 are connected to the outside of each sealing plate 21 through the water supply pipe 24. The front end of the flue gas dust removal pipe 1 is connected to the circulating gas vent pipe 4 and the pre-storage chamber vent pipe 5 through the main pipe 6, while the rear end is connected to the coke oven basement 8 through the pressurized fan 7. The tail end of the coke oven basement 8 is connected to the combustion chamber 9. The flue gas in the combustion chamber 9 is connected to the flue gas desulfurization and denitrification secondary dust removal device 10 through the pipe.

[0025] Multiple sets of inclined plates 12 are arranged in a ring array within the mounting plate 11, and the spacing between the inclined plates 12 structures within the multiple sets of mounting plate 11 structures in the flue gas dust removal pipe 1 gradually narrows from top to bottom; multiple sets of screening plates 3 are arranged in a linear array, and the vertical cross-section of each set of screening plates 3 is wavy; the device achieves precise interception and removal of dust in the flue gas through a three-stage dust removal structure of "screening plate 3 + inclined plate 12 + wet dust removal". The wavy screening plates 3, arranged in a linear array, can initially block large dust particles, while the wavy structure extends the residence time of flue gas, improving interception efficiency. The inclined plates 12, arranged in a ring array within the mounting plate 11 with gradually narrowing spacing from top to bottom, can perform secondary filtration of medium-sized dust particles. The gradually changing spacing design can adapt to the separation requirements of dust particles of different sizes, avoiding dust blockage while improving filtration accuracy. The wet dust collector 2 sprays water mist onto the flue gas through nozzles 23, deeply adsorbing fine dust particles. After the water mist fully contacts the flue gas, the dust is discharged with the water flow, further reducing the dust content of the flue gas. The synergistic effect of the three-stage dust collection significantly reduces the dust concentration in the flue gas, laying a good foundation for subsequent CO removal and desulfurization / denitrification processes.

[0026] Multiple sets of water supply pipes 24 are arranged in an equidistant array on the sealing plate 21, and each set of sealing plates 21 has a water inlet on its outer side. The sealing plates 21 are fixed to the side wall of the flue gas dust removal pipe 1 by bolts. Multiple sets of holes are pre-drilled on the mounting bracket 22, and each set of nozzles 23 is inserted and fixedly connected to each hole. The device forms a complete treatment process of "dust removal → CO removal → desulfurization, denitrification and secondary dust removal": After the flue gas is purified by the dust removal pipe, it is sent into the coke oven basement 8 by the pressurized fan 7, where CO is efficiently combusted in the combustion chamber 9 (converted into harmless CO2); the flue gas discharged from the combustion chamber 9 then enters the flue gas desulfurization, denitrification and secondary dust removal device 10, where sulfur oxides, nitrogen oxides and residual dust are removed simultaneously, and finally discharged in compliance with standards through the gate opener 101. The entire process has no secondary pollution, can effectively control the emission of air pollutants, complies with national environmental protection regulations and industry emission standards, and reduces the impact on the surrounding environment.

[0027] The tail end of the flue gas desulfurization, denitrification, and secondary dust removal device 10 is connected to the external environment through the on / off switch 101, and the tail end of the pressurized blower 7 is connected to the combustion chamber 9 through the exhaust gas on / off valve structure. In the wet dust removal assembly 2, the sealing plate 21 is fixed to the side wall of the flue gas dust removal pipe 1 with bolts, which facilitates disassembly and maintenance and prevents water mist from overflowing. The mounting bracket 22 has pre-drilled holes, and the nozzles 23 are inserted and fixed to ensure that the nozzles 23 are installed accurately and sprayed evenly, avoiding dust removal dead corners caused by misalignment of the nozzles 23. The pressurized blower 7 and the exhaust gas on / off valve structure can flexibly control the flue gas delivery volume. When the device is under maintenance or the operating conditions are adjusted, closing the exhaust gas on / off valve can prevent flue gas leakage. The design of the outer plate 15 and the side hole 16 not only provides installation space for the nozzles 23, but also protects the nozzles 23 from external environmental interference. The overall structure has a high degree of modularity, the components are firmly connected, the operation is convenient, and it can operate stably for a long time, reducing the equipment failure rate and maintenance costs.

[0028] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this utility model.

Claims

1. A CO removal process device for dry quenching circulating gas venting flue gas, characterized in that, The system includes a flue gas dust removal pipe (1), with a sieve plate (3) fixed inside the top of the flue gas dust removal pipe (1). Multiple sets of mounting plates (11) are provided at the bottom of the sieve plate (3), and an inclined plate (12) is fixed inside each set of mounting plates (11). The bottom end of the inclined plate (12) is fixedly connected to a base column (14) via a support rod (13). Multiple sets of side holes (16) are opened on the side wall of the flue gas dust removal pipe (1), and an outer plate (15) is fixed to the outside of the flue gas dust removal pipe (1) at this location. A wet dust removal assembly (2) is provided at the top of the outer plate (15), and the wet dust removal assembly (2) includes components inserted into the side... The nozzle (23) inside the hole (16), the mounting bracket (22) fixedly connected to the nozzle (23), and the sealing plate (21) covering the outside of the mounting bracket (22) are connected to the outside of each set of sealing plates (21) through the water supply pipe (24). The front end of the flue gas dust removal pipe (1) is connected to the circulating gas vent pipe (4) and the pre-storage chamber vent pipe (5) through the main pipe (6), while the rear end is connected to the coke oven basement (8) through the pressurized fan (7). The tail end of the coke oven basement (8) is connected to the combustion chamber (9). The flue gas in the combustion chamber (9) is connected to the flue gas desulfurization and denitrification secondary dust removal device (10) through the pipe.

2. The CO removal process device for dry quenching coke circulating gas venting flue gas according to claim 1, characterized in that, The inclined plates (12) are arranged in a ring array within the mounting plate (11) in multiple sets, and the spacing between the inclined plates (12) within the multiple sets of mounting plate (11) structures in the flue gas dust removal pipe (1) gradually narrows from top to bottom.

3. The CO removal process device for dry quenching circulating gas venting flue gas according to claim 1, characterized in that, The sieve plates (3) are arranged in a linear array of multiple groups, and the vertical cross section of each group of sieve plates (3) is wavy.

4. The CO removal process device for dry quenching circulating gas venting according to claim 1, characterized in that, The water supply pipe (24) is arranged in multiple sets at equal intervals on the sealing plate (21), and a water inlet is provided on the outside of each set of sealing plates (21). The sealing plate (21) is fixed to the side wall of the flue gas dust removal pipe (1) by bolts.

5. The CO removal process device for dry quenching circulating gas venting flue gas according to claim 4, characterized in that, The mounting bracket (22) has multiple sets of holes pre-drilled, and each set of nozzles (23) is fixedly connected to each hole.

6. The CO removal process device for dry quenching circulating gas venting flue gas according to claim 1, characterized in that, The tail end of the flue gas desulfurization and denitrification secondary dust removal device (10) is connected to the external environment through the opener (101), and the tail end of the pressurized fan (7) is connected to the combustion chamber (9) through the exhaust gas open and close valve structure.

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