A ramming type coke oven gas collecting device

Abstract

This utility model discloses a tamping-type coking oven gas collection device. A gas collecting pipe and a negative pressure pipe are installed at the top of the coking oven. The negative pressure pipe connects to a heat energy cascade recovery assembly, a spray device, and a filter assembly. The valve at the front end of the negative pressure pipe is automatically flipped by a combined drive assembly. The combined drive assembly uses a baffle, slide rod, and rack and pinion linkage to drive the valve using gas pressure, with a spring assisting in reset, achieving dynamic pressure balance in the system. The screw can adjust the initial opening of the valve. The heat energy cascade recovery assembly includes high-temperature, medium-temperature, and low-temperature heat exchangers, increasing the gas heat energy recovery rate to 60-70%. The filter assembly uses a porous ceramic layer and a molecular sieve layer to effectively remove micron-sized particles and molecular-level impurities. This device requires no additional power, can precisely control pressure, efficiently recover heat energy, and purify gas, solving problems such as energy waste, pressure runaway, and insufficient filtration in traditional devices. It improves the safety and economy of coking oven operation and is suitable for tamping-type coking oven gas collection.

Description

Technical Field

[0001] This utility model relates to the field of coal coking technology, and in particular to a tamping-type coking oven gas collection device. Background Technology

[0002] The tamping-type coking oven gas collection device is a core component of coal coking equipment, and its performance directly affects gas recovery efficiency and production safety. Existing technologies, such as the device disclosed in Chinese Patent CN101429439A, effectively solve the problem of raw coal gas leakage through a connected structure of an ascending pipe, a negative pressure fume extraction device, and a gas collection pipe, achieving centralized gas recovery and offering significant advantages in saving production costs and improving environmental performance. This technology maintains system pressure balance through the negative pressure fume extraction device, overcoming the smoke and fire problems encountered during traditional top-charging coking ovens, thus laying the foundation for the widespread application of tamping-type coking technology.

[0003] However, existing technologies still face significant technical bottlenecks. On one hand, energy utilization efficiency is insufficient. The high-temperature (500-600℃), medium-temperature (300-400℃), and low-temperature (150-200℃) waste heat contained in raw coal gas is not recovered in stages. Cooling the gas through a single process results in a large waste of sensible heat. On the other hand, pressure control relies on valves with fixed openings or manual adjustments, which cannot respond in real time to fluctuations in coke oven operating conditions. This can easily lead to problems such as excessive negative pressure causing air leakage in the furnace or insufficient suction causing gas overflow. Furthermore, the gas purification process lacks a fine filtration design. Traditional dust removal methods are insufficient to remove tiny particles and molecular-level impurities of 1-10 micrometers, increasing the load on subsequent purification processes.

[0004] To address the aforementioned shortcomings, this invention provides an improved tamping-type coking oven gas collection device. It achieves dynamic pressure balance by installing a spring-and-gear rack-and-pinion-driven automatic pressure regulating valve at the front end of the negative pressure pipe. It integrates high-temperature, medium-temperature, and low-temperature three-stage heat exchangers to construct a tiered heat energy recovery system, increasing the gas heat energy utilization rate to 60-70%. Simultaneously, it employs a filter assembly combining a porous ceramic layer and a molecular sieve layer to achieve micron-level particle interception and molecular-level impurity separation, significantly improving gas purity. Compared to existing technologies, this invention achieves key breakthroughs in energy saving, system stability, and gas purification effect, possessing significant practical value and promotional significance. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a tamping-type coking oven gas collection device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A tamping-type coking oven gas collection device includes a coking oven, a gas collecting pipe at the top of the coking oven, a negative pressure pipe at the top of the gas collecting pipe, a heat energy cascade recovery assembly, a spray device and a filter assembly connected to the negative pressure pipe, a valve disc at the front end of the negative pressure pipe, a rotating rod inserted laterally into the valve disc, the rotating rod rotating through the outer wall of the negative pressure pipe, and a combined drive assembly at its end for controlling the automatic flipping of the valve disc.

[0008] The above technical solution achieves dynamic pressure balance in the coke oven gas collection process by installing an automatically reversible valve and a combined drive assembly at the front end of the negative pressure pipe. When the gas pressure increases, the combined drive assembly automatically opens the valve, increasing the gas flow; when the pressure decreases, the valve automatically closes, reducing suction. This design avoids the problems of furnace leakage or gas overflow caused by fluctuations in operating conditions with traditional fixed-opening valves, stabilizing the system pressure within a safe range and significantly improving the safety of coke oven operation and gas collection efficiency.

[0009] Preferably, the combined drive assembly includes a baffle that is slidably installed at the front end of the negative pressure pipe, a slide rod that is laterally provided at the center of the baffle, the slide rod slidingly passing through the center of the end of the negative pressure pipe, a slide seat that is slidably connected to the top of the slide rod, a rack that is laterally provided at the tail end of the slide seat, a gear that meshes with the bottom of the rack, and the gear that is coaxially sleeved on the end of the rotating rod.

[0010] Through the above technical solution, the combined drive assembly adopts a "baffle-slide rod-rack and gear" transmission structure, which directly drives the valve disc to move using gas pressure, without the need for an additional power source. When the baffle slides, it drives the slide block and rack to move laterally through the slide rod. The rack and gear mesh to drive the rotating rod to rotate, realizing linear adjustment of the valve disc opening. This solves the problem of easy failure of traditional electric or pneumatic regulating valves in high-temperature gas environments, and greatly improves the reliability of the device.

[0011] Preferably, a screw is threaded into the slide block, and a mounting seat is rotatably fitted onto the outer circumference of the screw, with the mounting seat fixed to the top of the slide block.

[0012] Through the above technical solution, the combined drive assembly adopts a "baffle-slide rod-rack and gear" transmission structure, which directly drives the valve disc to move using gas pressure, without the need for an additional power source. When the baffle slides, it drives the slide block and rack to move laterally through the slide rod. The rack and gear mesh to drive the rotating rod to rotate, realizing linear adjustment of the valve disc opening. This solves the problem of easy failure of traditional electric or pneumatic regulating valves in high-temperature gas environments, and greatly improves the reliability of the device.

[0013] The screw adjustment mechanism installed between the slide block and the slide rod allows for manual adjustment of the initial valve opening during equipment installation or operating condition adjustments. By rotating the screw to change the initial position of the slide block on the slide rod, the minimum / maximum opening angle of the valve disc can be precisely set to adapt to the differences in gas production rates of different coke ovens.

[0014] Furthermore, the filter assembly includes a housing, inside which a porous ceramic layer and a molecular sieve layer are sequentially arranged along the gas flow direction.

[0015] Through the above technical solution, the filter component adopts a dual-layer filtration structure of "porous ceramic layer + molecular sieve layer," achieving graded purification of coal gas impurities. The porous ceramic layer with a pore size of 1-10μm can effectively intercept micron-sized solid impurities such as coke powder and tar particles. The subsequent molecular sieve layer filters small molecule impurities such as H2O and H2S through molecular-level channels of <1nm. This design provides a high-purity gas source for subsequent deep processing such as coal gas to hydrogen production and power generation, reducing the load and cost of desulfurization, naphthalene removal, and other processes.

[0016] Furthermore, the heat energy cascade recovery assembly includes a high-temperature heat exchanger, a medium-temperature heat exchanger, and a low-temperature heat exchanger arranged sequentially along the flow direction of the airflow inside the negative pressure pipe.

[0017] The above technical solution utilizes a cascaded heat recovery system with high-temperature, medium-temperature, and low-temperature heat exchangers connected in series to utilize the sensible heat of coal gas in a gradient manner: the high-temperature stage generates high-pressure steam to drive power generation; the medium-temperature stage provides heating for processes such as coal preheating; and the low-temperature stage is used for plant heating. Compared to traditional single-stage heat exchange technology, this design increases the coal gas heat recovery rate from 30%-40% to 60%-70%, significantly reducing the energy consumption of coking plants.

[0018] Preferably, a spring is fitted on the outer circumference of the slide rod near the position between the inner wall of the negative pressure pipe and the baffle.

[0019] Through the above technical solution: the spring set on the outer periphery of the slide bar provides the reset elastic force for the baffle. When the gas pressure is lower than the set threshold, the spring pushes the baffle forward, causing the valve to close, thus avoiding the system's negative pressure imbalance caused by excessive suction and enhancing the stability of the device under sudden operating conditions.

[0020] The beneficial effects of this utility model are as follows:

[0021] 1. This utility model achieves significant beneficial effects through multi-dimensional innovation: In terms of pressure control, it utilizes a combined drive component with spring-gear rack linkage to automatically adjust the valve opening according to the gas pressure. Combined with the adjustable initial opening design of the screw, it dynamically maintains the system pressure within a safe range, solving the problems of air leakage and overflow of traditional fixed valves. The three-stage heat exchanger constructs a tiered heat energy recovery system, increasing the gas heat energy recovery rate from 30%-40% to 60%-70%. The high-temperature section generates electricity, the medium-temperature section provides process heating, and energy consumption is significantly reduced. The purification stage adopts a double-layer filtration of "porous ceramic + molecular sieve". The overall structure requires no additional power source, and the mechanical transmission is compact and durable, significantly improving the reliability and adaptability of the device, and achieving energy-saving, stable, and efficient gas collection and treatment.

[0022] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of a tamping-type coking oven gas collection device proposed in this utility model.

[0024] Figure 2 This is a side view of the structure of a tamping type coking oven gas collection device proposed in this utility model.

[0025] Figure 3 This utility model proposes a tamping-type coking oven gas collection device. Figure 1 A magnified schematic diagram of the local structure at point A;

[0026] Figure 4 This utility model proposes a tamping-type coking oven gas collection device. Figure 2 A magnified schematic diagram of the local structure at point B;

[0027] Figure 5 This is a schematic diagram of the filter component structure of a tamping-type coking oven gas collection device proposed in this utility model.

[0028] In the diagram: 1. Coking furnace; 2. Gas collecting pipe; 3. Negative pressure pipe; 4. High-temperature heat exchanger; 5. Medium-temperature heat exchanger; 6. Low-temperature heat exchanger; 7. Spraying device; 8. Filter assembly; 81. Shell; 82. Porous ceramic layer; 83. Molecular sieve layer; 9. Baffle; 10. Sliding rod; 11. Spring; 12. Valve disc; 13. Rotating rod; 14. Gear; 15. Rack; 16. Screw; 17. Mounting base; 18. Slide seat. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0030] Example 1, referring to Figures 1 to 5 ,

[0031] I. Overall Equipment Layout

[0032] As shown in the figure, the tamping-type coking oven gas collection device includes a coking oven 1, with a horizontally arranged gas collecting pipe 2 fixedly welded to its top. A negative pressure pipe 3 is vertically connected to the center of the top of the gas collecting pipe 2. The negative pressure pipe 3, along the gas flow direction, is sequentially connected from left to right to a heat energy cascade recovery assembly, a spray device 7, and a filter assembly 8. At the front end of the negative pressure pipe 3, near the inner wall of the gas collecting pipe 2, a valve disc 12 is rotatably mounted via a bearing. A rotating rod 13 is transversely inserted through the middle of the valve disc 12. Both ends of the rotating rod 13 pass through the sidewalls of the negative pressure pipe 3 and extend to the outside. A combined drive assembly for driving the rotating rod 13 to rotate is provided at its ends.

[0033] II. Specific Structure of the Joint Drive Component

[0034] baffle and slide bar mechanism

[0035] The baffle 9 is a circular metal plate with an outer diameter that matches the inner diameter of the negative pressure pipe 3, and can slide axially along the negative pressure pipe 3. A sliding rod 10 is vertically welded to the center of the baffle 9. The sliding rod 10 passes through the central through hole of the negative pressure pipe 3. The inner wall of the through hole has a straight sliding groove that matches the sliding rod 10, restricting the sliding rod 10 to move only axially.

[0036] Spring 11 is sleeved on the outer periphery of slide rod 10, located between baffle 9 and the inner wall of the left end of negative pressure tube 3. The left end of spring 11 abuts against the inner wall of negative pressure tube 3, and the right end abuts against baffle 9. In the initial state, it is in a compressed state, providing a rightward restoring force.

[0037] Gear and rack transmission mechanism

[0038] The slide block 18 is a U-shaped slider, which is slidably mounted on the horizontal guide rail at the top of the slide rod 10 and can slide along the length of the slide rod 10. A rack 15 is horizontally fixed at the tail of the slide block 18, and a gear 14 meshes below the rack 15. The gear 14 is coaxially fixedly sleeved on the right end of the rotating rod 13, and the two are connected by a flat key.

[0039] Screw adjustment mechanism: A threaded hole is provided in the middle of the slide 18, through which a screw 16 is horizontally inserted. The left end of the screw 16 is rotatably connected to the mounting base 17 via a bearing. The mounting base 17 is welded and fixed to the top of the slide 10. When the screw 16 is rotated, the slide 18 can move axially along the screw 16 to adjust the initial opening of the valve disc 12.

[0040] III. Implementation Details of Heat Energy Cascade Recovery Components

[0041] High temperature heat exchanger 4

[0042] It adopts a shell-and-tube structure, with coke oven gas flowing through the shell side and softened water flowing through the tube side. The heat from the gas is transferred to the softened water to generate high-pressure steam, which is then transported through pipelines to the turbine generator set to generate electricity.

[0043] The medium-temperature heat exchanger 5 adopts a plate heat exchanger, and the other side is connected to the coking plant process circulating water for preheating coking coal or heating the tar distillation tower to realize the recovery of medium-temperature heat energy.

[0044] The low-temperature heat exchanger 6 adopts a finned tube heat exchanger with a gas outlet temperature of 150-200℃. The other side is connected to the plant's heating water or low-temperature process medium to achieve low-temperature heat energy recovery.

[0045] IV. Detailed Structure of the Filter Component

[0046] The filter assembly 8 includes a cylindrical housing 81, with the following components arranged sequentially inside along the gas flow direction:

[0047] Porous ceramic layer 82: Made of corundum porous ceramic plate with a pore size of 1-10 micrometers, it is fixed to the inner wall of the shell by a flange and is used to filter solid impurities such as coke powder and tar particles.

[0048] Molecular sieve layer 83: Filled with type A zeolite molecular sieve particles, fixed behind the porous ceramic layer by a sieve plate, used to adsorb small molecule impurities such as H2O and H2S, and improve the purity of coal gas.

[0049] Working principle

[0050] The gas produced by coking oven 1 flows into negative pressure pipe 3 through gas collecting pipe 2, with the initial pressure provided by coking oven blower. When the gas pressure increases, the pressure pushes baffle 9 to move to the right, compressing spring 11 and sliding rod 10 to move to the right simultaneously, driving sliding seat 18 and rack 15 to move to the right. Rack 15 drives gear 14 to rotate clockwise, and rotating rod 13 drives valve disc 12 to flip upward, increasing the gas flow cross-sectional area.

[0051] When the pressure decreases, the spring 11 returns to its restoring force, pushing the baffle 9 to the right, and the valve disc 12 flips downward to close, reducing the suction force and maintaining stable system pressure.

[0052] During equipment commissioning, the initial position of the slide block 18 can be adjusted by rotating the screw 16, which can set the initial opening of the valve disc 12.

[0053] The high-temperature gas first passes through the high-temperature heat exchanger 4 to generate electricity, then through the medium-temperature heat exchanger 5 to provide heat, and finally through the low-temperature heat exchanger 6 to provide heating. After three stages of heat exchange, the gas temperature drops to below 100℃ and enters the spray device 7 for further cooling and dust removal.

[0054] After cooling, the coal gas passes through a porous ceramic layer 82 to remove micron-sized particles, and then through a molecular sieve layer 83 to adsorb molecular-sized impurities, finally outputting clean coal gas.

[0055] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A tamping-type coking oven gas collection device, comprising a coking oven (1), wherein a gas collecting pipe (2) is provided at the top of the coking oven (1), and a negative pressure pipe (3) is provided laterally at the top of the gas collecting pipe (2), wherein the negative pressure pipe (3) is connected to a heat energy cascade recovery assembly, a spraying device (7), and a filter assembly (8), characterized in that, The front end of the negative pressure pipe (3) is provided with a valve disc (12), and a rotating rod (13) is inserted horizontally into the valve disc (12). The rotating rod (13) rotates through the outer wall of the negative pressure pipe (3), and its end is provided with a combined drive assembly for controlling the automatic flipping of the valve disc (12).

2. The tamping-type coking oven gas collection device according to claim 1, characterized in that, The combined drive assembly includes a baffle (9) slidably mounted on the front end of the negative pressure pipe (3). A slide rod (10) is provided laterally at the center of the baffle (9). The slide rod (10) slides through the center of the end of the negative pressure pipe (3). A slide seat (18) is slidably connected to the top of the slide rod (10). A rack (15) is provided laterally at the tail end of the slide seat (18). A gear (14) meshes with the bottom of the rack (15). The gear (14) is coaxially sleeved on the end of the rotating rod (13).

3. The tamping-type coking oven gas collection device according to claim 2, characterized in that, The slide block (18) is threaded with a screw (16) in the transverse direction. The outer circumferential surface of the screw (16) is rotatably fitted with a mounting seat (17), and the mounting seat (17) is fixed to the top of the slide block (10).

4. The tamping-type coking oven gas collection device according to claim 3, characterized in that, The filter assembly (8) includes a housing (81), and a porous ceramic layer (82) and a molecular sieve layer (83) are sequentially arranged inside the housing (81) along the gas flow direction.

5. A tamping-type coking oven gas collection device according to claim 1, characterized in that, The heat energy cascade recovery assembly includes a high-temperature heat exchanger (4), a medium-temperature heat exchanger (5), and a low-temperature heat exchanger (6) arranged sequentially along the flow direction of the airflow inside the negative pressure pipe (3).

6. A tamping-type coking oven gas collection device according to claim 2, characterized in that, A spring (11) is fitted on the outer circumference of the slide rod (10) near the position between the inner wall of the negative pressure pipe (3) and the baffle (9).

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