A device for reducing the dust content of raw coke oven gas and a method of using the same

Abstract

A device for reducing the dust content of raw coke oven gas in a coke oven and a method for using the same belong to the technical field of coke oven gas treatment. The present application solves the problem that the existing ammonia bridge pipe spraying device cannot completely clean the raw coke oven gas, resulting in a large amount of coal powder blocking the primary cooler. The dust control device comprises an ammonia water tank, a first spraying device and a second spraying device, the ammonia water tank contains ammonia water, the first spraying device is arranged at the top of the washing tower, the first spraying device is in communication with the ammonia water tank pipeline, and the ammonia water is sprayed into the washing tower through the first spraying device. The internal structure of the washing tower in the present application can make the ammonia water circulate and wash multiple times in an orderly manner, can effectively reduce the dust carrying content of the coke oven raw coke oven gas during the discharge process, and can prevent it from entering the subsequent primary cooler system with the gas, thereby significantly reducing the blockage of the primary cooler heat exchange tube bundle, reducing the system maintenance frequency and operation resistance.

Description

Technical Field

[0001] This invention relates to the field of coke oven gas treatment technology, and more particularly to a device for reducing the dust content of raw coke oven gas and its method of use. Background Technology

[0002] During the coal charging process in a top-loading coke oven, the amount of coal dust generated can reach 0.5 to 1.6 kg / t coke, corresponding to a dust concentration in the flue gas that may be as high as 1000 to 2000 mg / m³ or even higher. In order to avoid dust generation during coal charging, high-pressure ammonia water is usually sprayed at the riser bridge pipe to create a negative pressure, which draws the coal powder into the gas collecting pipe, suction pipe and gas-liquid separator, and then into the coke oven gas purification system such as the primary cooler.

[0003] Currently, most coking plants use ammonia water bridge pipe spraying devices to reduce the temperature of raw coal gas. The sprayed ammonia water forms a spray cone at a fixed angle, which can only clean part of the raw coal gas and wash away some of the dust entrained in it. However, a large amount of coal dust will enter the primary cooler through the gas-liquid separator along with the coke oven gas, causing problems such as increased resistance or blockage in the primary cooler, especially in systems equipped with coal moisture conditioning processes. At the same time, the uneven cooling of coke oven gas causes fluctuations in gas temperature and pressure, which can easily lead to the risk of raw coke oven gas venting and the high operating costs of high-load operation of blowers. Summary of the Invention

[0004] The present invention addresses the problem that existing spraying devices can only clean some of the dust entrained in raw coal gas, leading to increased resistance or blockage in the primary cooler. The invention provides a device and its method for reducing the dust content in raw coal gas in coke ovens.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a device for reducing the dust content of raw coal gas in a coke oven, comprising a scrubbing tower and a dust control system. The scrubbing tower is installed inside the coke oven, and multiple tower plates are inclined from top to bottom inside the scrubbing tower. Each tower plate is provided with multiple guide holes. The bottom of the scrubbing tower is connected to and fixed to a coke oven riser pipe. One end of the coke oven riser pipe is connected to raw coal gas. The dust control device includes an ammonia water tank, a first spraying device, and a second spraying device. The ammonia water tank is filled with ammonia water. The first spraying device is located at the top of the scrubbing tower and is connected to the ammonia water tank pipeline. The ammonia water is sprayed into the scrubbing tower through the first spraying device. The second spraying device is connected to the ammonia water tank through a first pipeline. The second spraying device includes multiple nozzles. The multiple nozzles are sequentially connected and fixed to one side of the scrubbing tower, and each nozzle is located between two adjacent tower plates.

[0006] Furthermore, a first valve is provided on the first pipeline, and the first valve is opened or closed simultaneously with the first spraying device.

[0007] Furthermore, it also includes a coke oven cleaning system, which includes an oil washing tank filled with oil washing liquid, and the oil washing tank and the second spraying device are connected through a second pipeline.

[0008] Furthermore, a second valve is provided on the second pipeline, and the second valve has the opposite opening and closing state to the first valve.

[0009] Furthermore, the tilt angle of each of the trays relative to the horizontal plane ranges from 1° to 8°.

[0010] Furthermore, the bottom end of the tower plate along the inclined direction is provided with a slag discharge notch.

[0011] Furthermore, a pressure gauge is installed on the coke oven riser pipe.

[0012] Furthermore, the ammonia water tank delivers ammonia water to the first spraying device and the second spraying device via a first high-pressure pump. The temperature of the ammonia water in the ammonia water tank is between 70℃ and 75℃, and the pressure of the ammonia water is controlled to be no less than 2.6MPa.

[0013] Furthermore, the washing oil tank uses a second high-pressure pump to deliver the washing oil to the second spraying device.

[0014] A method of using a device for reducing the dust content in raw coal gas inside a coke oven includes the following steps: When the coke oven is in the high-pressure coking stage, raw coal gas is introduced into the coke oven riser pipe, and the first spraying device and the first valve are simultaneously turned on to spray high-pressure ammonia water into the washing tower to remove dust from the raw coal gas; when the coke oven is in the coking stage, the first spraying device and the first valve are simultaneously turned off; when the coke oven is in the coking stage and the tower pressure of the washing tower is ≥200Pa, the second valve is turned on to clean the inner wall and tower plates of the washing tower, and the temperature of the washing oil entering the tower is kept between 40℃ and 60℃ through the heat exchange equipment.

[0015] Compared with the prior art, the present invention has the following advantages: This invention achieves deep and uniform purification of coke oven raw gas by replacing the traditional ammonia water bridge pipe spraying mode with a scrubbing tower. The internal structure of the scrubbing tower allows for multiple and orderly circulation of ammonia water for scrubbing. Compared with unidirectional spraying, its core advantage lies in its ability to uniformly cool and contact the entire cross-section of the raw gas passing through the tower, allowing dust particles to be more fully wetted and removed. This effectively reduces the dust content carried by the coke oven raw gas during the extraction process, reducing the dust concentration by 90% to 95%. This reduces the dust load on subsequent purification units from the source, laying a solid foundation for the stable and efficient operation of the entire gas purification system. The scrubbing tower spraying method employed in this invention not only effectively reduces the gas temperature by 3°C to 10°C, but also promotes the premature condensation of high-boiling-point organic compounds such as tar in the gas within the scrubbing tower. This process traps a large amount of these easily condensable impurities during the scrubbing stage, preventing them from entering the subsequent primary cooler system with the gas. This significantly reduces the blockage of the primary cooler heat exchanger tube bundles, lowering the cleaning frequency of the primary cooler system by 10% to 30%. This invention utilizes a scrubbing tower to stably and uniformly spray ammonia water onto raw coal gas, enabling multiple cooling processes across the entire cross-section of the gas flow pipeline. This significantly improves the temperature stability of the gas entering subsequent systems. Consequently, it effectively reduces the fluctuation range of gas pressure in the intake pipeline, significantly mitigating the risk of raw coal gas venting due to sudden pressure spikes. Simultaneously, the stable intake conditions drastically reduce the operating load of the blower by 5% to 20%. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 some embodiments of the present invention. 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 device used to reduce the dust content in raw coal gas in the coke oven according to the present invention. In the diagram: 1. Ammonia water tank; 2. First high-pressure pump; 3. First valve; 4. Second valve; 5. Washing oil tank; 6. Tower plate; 7. Scrubbing tower; 8. Pressure gauge; 9. Coke oven riser pipe; 10. Suction pipe; 11. Suction pressure gauge; 12. Gas-liquid separator; 13. Tar ammonia water pipe; 14. First spraying device; 15. Second spraying device; 16. Nozzle; 17. First pipeline; 18. Second pipeline; 19. Second high-pressure pump. Detailed Implementation

[0018] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0021] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0022] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0023] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0024] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0025] See appendix Figure 1 This embodiment describes a device for reducing the dust content of raw coal gas in a coke oven, comprising a scrubbing tower 7 and a dust control system. The scrubbing tower 7 is installed inside the coke oven, and multiple trays 6 are inclined from top to bottom inside the scrubbing tower 7. Each tray 6 has multiple guide holes. The bottom of the scrubbing tower 7 is connected to and fixedly connected to a coke oven riser pipe 9, one end of which is connected to raw coal gas. The dust control device includes an ammonia water tank 1, a first spraying device 14, and a second spraying device 15. The ammonia water tank 1 contains ammonia water. The first spraying device 14 is located at the top of the scrubbing tower 7 and is connected to the ammonia water tank 1 by a pipe. The ammonia water is sprayed into the scrubbing tower 7 through the first spraying device 14. The second spraying device 15 is connected to the ammonia water tank 1 through a first pipe 17. The second spraying device 15 includes multiple nozzles 16, which are sequentially connected and fixedly connected to one side of the scrubbing tower 7, and each nozzle 16 is located between two adjacent trays 6. Specifically, after being purified by the scrubbing tower 7, the raw coal gas flows through components such as the suction pipe 10, the suction pressure gauge 11, the gas-liquid separator 12, and the tar-ammonia water pipe 13. All of these components are specific structures of the coke oven, and their specific connection methods and relative positions are existing technologies, which will not be described in detail here.

[0026] This invention achieves deep and uniform purification of coke oven raw gas by replacing the traditional ammonia water bridge pipe spraying mode with a scrubbing tower 7. The internal structure of the scrubbing tower 7 allows for multiple and orderly circulation of ammonia water for scrubbing. Compared with unidirectional spraying, its core advantage lies in its ability to uniformly cool and contact the entire cross-section of the raw gas passing through the tower, allowing dust particles to be more fully wetted and removed. This effectively reduces the dust content carried by the coke oven raw gas during the extraction process, reducing the dust load of subsequent purification units from the source, and laying a good foundation for the stable and efficient operation of the entire gas purification system.

[0027] A first valve 3 is provided on the first pipeline 17, and the first valve 3 and the first spraying device 14 open or close simultaneously. By synchronously opening and closing the first valve 3 and the first spraying device 14, precise linkage between the top spraying and the side spraying actions is achieved, enabling multiple and orderly circulating washing of the interior of the scrubbing tower 7 with ammonia water, so that dust particles can be more fully wetted and removed, effectively reducing the dust content carried by the raw coke oven gas during the extraction process.

[0028] The system also includes a coke oven cleaning system, which comprises an oil washing tank 5 filled with washing liquid. The oil washing tank 5 and the second spraying device 15 are connected via a second pipe 18. The coke oven cleaning system deeply cleans the deposits adsorbed on the surface of the tray 6 and the inner wall of the coke oven, effectively ensuring the efficiency of the flow of ammonia water and raw coal gas through the tray 6. Connecting the oil washing tank 5 and the second spraying device 15 via the second pipe 18 fully utilizes the second spraying device 15, effectively simplifying the device structure.

[0029] The second pipe 18 is equipped with a second valve 4, which has the opposite opening and closing state to the first valve 3. By setting the opening and closing states of the first valve 3 and the second valve 4 to be opposite, it is easier to control the second spraying device 15 to spray only the corresponding liquid under different working conditions, preventing the mixing or co-spraying of different liquids, and greatly improving the stability and reliability of the device.

[0030] The tilt angle of each tray 6 relative to the horizontal plane ranges from 1° to 8°. Specifically, the arrangement of the tray 6 can significantly increase the overall length of the ammonia water flow, increase the contact time with the raw coal gas, which is beneficial to the purification and cooling of the raw coal gas. In addition, the tilt angle of the tray 6 can guide the flow direction of the ammonia water, further increasing the overall residence time of the ammonia water.

[0031] The bottom end of the inclined tray 6 is provided with a slag discharge notch. The slag discharge notch is located at the bottom end of the inclined tray 6, which serves two purposes: firstly, to provide a discharge channel for larger pieces of attached material, and secondly, to make it easier for all attached material on the tray 6 to slide along the inclined surface to the notch, reducing accumulation and cleaning difficulty.

[0032] The coke oven riser pipe 9 is equipped with a pressure gauge 8. When the pressure gauge 8 reaches a preset value and the coke oven is in the coking stage, the coke oven cleaning system is activated.

[0033] The ammonia tank 1 delivers ammonia water to the first spraying device 14 and the second spraying device 15 via the first high-pressure pump 2. The temperature of the ammonia water in the ammonia tank 1 is between 70°C and 75°C, and the pressure of the ammonia water is controlled to be no less than 2.6 MPa.

[0034] The washing oil tank 5 delivers the washing oil to the second spraying device 15 via the second high-pressure pump 19.

[0035] A method of using a device for reducing the dust content in raw coal gas inside a coke oven includes the following steps: When the coke oven is in the high-pressure coking stage, raw coal gas is introduced into the coke oven riser pipe 9, and the first spraying device 14 and the first valve 3 are simultaneously turned on to spray high-pressure ammonia water into the washing tower 7 to remove dust from the raw coal gas; when the coke oven is in the coking stage, the first spraying device 14 and the first valve 3 are simultaneously turned off; when the coke oven is in the coking stage and the tower pressure of the washing tower 7 is ≥200Pa, the second valve 4 is turned on to clean the inner wall of the washing tower 7 and the tower plate 6, and the temperature of the washing oil entering the tower is kept between 40℃ and 60℃ through the heat exchange equipment.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention 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 or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for reducing the dust content in raw coal gas inside a coke oven, characterized in that: The system includes a scrubbing tower (7) and a dust control system. The scrubbing tower (7) is installed inside the coke oven. Multiple trays (6) are inclined from top to bottom inside the scrubbing tower (7). Each tray (6) has multiple guide holes. The bottom of the scrubbing tower (7) is connected to and fixed to the coke oven riser pipe (9). One end of the coke oven riser pipe (9) is connected to raw coal gas. The dust control device includes an ammonia water tank (1), a first spraying device (14), and a second spraying device (15). The ammonia water tank (1) is filled with ammonia water. The first spraying device (14) The first spraying device (14) is connected to the ammonia tank (1) via a pipe and sprays ammonia into the washing tower (7) through the first spraying device (14). The second spraying device (15) is connected to the ammonia tank (1) via a first pipe (17). The second spraying device (15) includes multiple nozzles (16), which are sequentially connected and fixed to one side of the washing tower (7). Each nozzle (16) is located between two adjacent tower plates (6).

2. The device for reducing the dust content in raw coal gas in a coke oven according to claim 1, characterized in that: The first pipe (17) is provided with a first valve (3), which is opened or closed simultaneously with the first spraying device (14).

3. The device for reducing the dust content in raw coal gas in a coke oven according to claim 2, characterized in that: It also includes a coke oven cleaning system, which includes an oil washing tank (5) containing oil washing liquid, and the oil washing tank (5) and the second spraying device (15) are connected through a second pipe (18).

4. The device for reducing the dust content in raw coal gas in a coke oven according to claim 3, characterized in that: The second pipe (18) is provided with a second valve (4), and the opening and closing state of the second valve (4) is opposite to that of the first valve (3).

5. The device for reducing the dust content in raw coal gas in a coke oven according to claim 1, characterized in that: Each of the trays (6) has an inclination angle of 1° to 8° relative to the horizontal plane.

6. The device for reducing the dust content in raw coal gas in a coke oven according to claim 1, characterized in that: The tower plate (6) has a slag discharge notch at the bottom end along the inclined direction.

7. The device for reducing the dust content in raw coal gas in a coke oven according to claim 1, characterized in that: A pressure gauge (8) is installed on the coke oven riser pipe (9).

8. The device for reducing the dust content in raw coal gas in a coke oven according to claim 1, characterized in that: The ammonia tank (1) delivers ammonia water to the first spraying device (14) and the second spraying device (15) via the first high-pressure pump (2). The temperature range of the ammonia water in the ammonia tank (1) is between 70°C and 75°C, and the pressure of the ammonia water is controlled to be no less than 2.6 MPa.

9. The device for reducing the dust content in raw coal gas in a coke oven according to claim 3, characterized in that: The washing tank (5) delivers the washing oil to the second spraying device (15) via the second high-pressure pump (19).

10. A method of using the device for reducing the dust content of raw coal gas in a coke oven as described in any one of claims 1 to 9, characterized in that: When the coke oven is in the high-pressure coking stage, raw coal gas is introduced into the coke oven riser pipe (9), and the first spraying device (14) and the first valve (3) are opened simultaneously to spray high-pressure ammonia water into the washing tower (7) to remove dust from the raw coal gas; when the coke oven is in the coking stage, the first spraying device (14) and the first valve (3) are closed simultaneously; when the coke oven is in the coking stage and the tower pressure of the washing tower (7) is ≥200Pa, the second valve (4) is opened to clean the inner wall of the washing tower (7) and the tower plate (6), and the temperature range of the washing oil entering the tower is kept between 40℃ and 60℃ by the heat exchange equipment.

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