Structure for preventing ash deposition of lower gas chamber of dry quenching furnace and dry quenching furnace

Abstract

The utility model discloses a dry quenching furnace lower gas chamber ash deposition prevention structure and a dry quenching furnace, the dry quenching furnace lower gas chamber ash deposition prevention structure comprises a communication valve, the two ends of the communication valve are respectively connected with an upper gas chamber and a lower gas chamber of the dry quenching furnace, redundant circulating gas in the lower gas chamber can enter the upper gas chamber, the ash removal pipe is arranged in the lower gas chamber, and the upper gas chamber is communicated with the lower gas chamber. According to the structure for preventing ash deposition in the lower gas chamber of the dry quenching furnace, redundant circulating gas in the lower gas chamber can be shunted to the upper gas chamber through the communicating valve, the flow speed of the circulating gas in the lower gas chamber is increased, coke powder cannot be deposited in the upper gas chamber due to the existence of the circular seam, and the ash deposition is prevented. And meanwhile, the ash deposition amount of the lower gas chamber is reduced, ash can be discharged through the ash removal pipe during the operation period of the dry quenching furnace, and manual ash removal by blowing out the furnace is not needed.

Description

Technical Field

[0001] The utility model belongs to the technical field of dry quenching furnaces, and more specifically relates to a structure for preventing dust accumulation in a lower air chamber of a dry quenching furnace and a dry quenching furnace. Background Art

[0002] The coking plant currently has a set of dry quenching coke with a capacity of 90t / h and a dry quenching rate of more than 95%. During operation, as the running time of the dry quenching furnace increased, sampling of the coke discharge belt on site revealed that some coke had a low surface temperature, some had a high surface temperature, and even sporadic red coke was discharged. The uniformity of the coke discharge temperature gradually deteriorated. No abnormality was found in the distributor in the charging device bell by checking the dry quenching furnace ramp adjustment bricks. The adjustment bricks were checked and found to be not heavily damaged. There was no large deviation in the temperature distribution of the dry quenching furnace cooling sections T3 and T4 along the circumferential direction. The effect of adjusting the air inlet ratio of the cross duct and the peripheral duct of the dry quenching furnace was not obvious. Since there was only one set of dry quenching coke, the abnormal coke discharge temperature limited the coke discharge capacity, which seriously restricted the production rhythm of the plant.

[0003] During the one-year maintenance period, it was found that there was a large amount of ash accumulation in the lower air chamber of the CDQ furnace, and the height was basically flush with the cross air duct, but there was basically no ash accumulation in the upper air chamber. In response to this, the coking plant adopted the conventional method of manual entry and cleaning. After the annual maintenance, 18 months after the start of production, the uniformity of coke discharge gradually deteriorated, and the coke discharge temperature gradually increased. It was forced to continue to increase the load of the circulating fan. Keeping the circulating fan working under a high load for a long time will not only damage the equipment, but also have an adverse effect on the temperature and pressure process parameters of the gas circulation system. Therefore, the annual maintenance was carried out again. During the period, through careful inspection of various parts, it was found that there was a large amount of ash accumulation in the lower air chamber of the CDQ furnace, and the height was basically flush with the cross air duct, but there was basically no ash accumulation in the upper air chamber. Ash accumulation. Based on an in-depth analysis of this phenomenon, it is concluded that due to the structure of the lower air chamber itself, when the circulating gas enters the lower air chamber, the shell of the lower air chamber acts as a retaining wall, and part of the gas will move in a circular direction, eventually forming convection, which reduces the flow rate of the circulating gas and causes the coke powder to continuously deposit. However, the upper air chamber will not cause coke powder to deposit due to the existence of annular gaps. When the amount of coke powder deposited in the lower air chamber is large, the resistance of the circulating gas entering the lower air chamber will become greater, and more circulating gas will enter the dry quenching furnace through the peripheral annular gaps of the upper air chamber, resulting in an imbalance in the central and peripheral air distribution ratios.

[0004] Therefore, it is necessary to optimize the existing CDQ furnace to reduce ash accumulation in the lower air chamber and ensure stable operation of the CDQ furnace. Utility Model Content

[0005] The utility model aims to provide a structure for preventing dust accumulation in the lower air chamber of a dry quenching furnace in view of the deficiencies in the prior art, and solves the problem that due to the structure of the lower air chamber of the existing dry quenching furnace, when the circulating gas enters the lower air chamber, the shell of the lower air chamber acts as a retaining wall, and part of the gas moves in a circular direction, eventually forming convection, reducing the flow rate of the circulating gas and causing coke powder to continuously deposit.

[0006] In order to achieve the above object, the utility model provides a structure for preventing dust accumulation in the air chamber under a dry quenching furnace, comprising:

[0007] A connecting valve, the two ends of which are respectively connected to the upper air chamber and the lower air chamber of the CDQ furnace, so that the excess circulating gas in the lower air chamber can enter the upper air chamber;

[0008] The ash removal pipe is arranged in the lower air chamber, one end of the ash removal pipe is an ash suction port, and the other end of the ash removal pipe passes through the lower air chamber and is exposed.

[0009] Optionally, the other end of the ash removal pipe is connected to a dust removal pipe of a coke removal belt.

[0010] Optionally, the one end of the ash removal pipe is an annular pipe, the annular pipe is arranged in the lower air chamber, and a plurality of ash suction ports are arranged on the annular pipe.

[0011] Optionally, the annular duct is located below the cross air duct.

[0012] Optionally, the annular pipe is 10 mm from the ground.

[0013] Optionally, a plurality of arc-shaped ash suction ports are arranged at intervals on the lower side wall of the annular pipe.

[0014] Optionally, the other end of the ash removal pipe is away from the air inlet of the lower air chamber.

[0015] Optionally, an upper manhole and a lower manhole are opened on the same side of the upper air chamber and the lower air chamber, and the connecting valve is located between the upper manhole and the lower manhole.

[0016] Optionally, the connecting valve is provided with multiple openings, which can adjust the airflow distribution ratio of the upper air chamber and the lower air chamber.

[0017] The utility model also provides a dry quenching furnace, comprising the above-mentioned structure for preventing dust accumulation in the lower air chamber of the dry quenching furnace.

[0018] The utility model provides a structure for preventing dust accumulation in the air chamber under a dry quenching furnace, and its beneficial effects are:

[0019] The structure for preventing ash accumulation in the lower air chamber of the dry quenching furnace allows excess circulating gas in the lower air chamber to be diverted to the upper air chamber through a connecting valve, thereby increasing the flow rate of the circulating gas in the lower air chamber. Due to the presence of the annular seam in the upper air chamber, coke powder will not be deposited, and the ash accumulation in the lower air chamber is also reduced. Ash can be discharged during the operation of the dry quenching furnace through the ash removal pipe, without the need to stop the furnace for manual cleaning.

[0020] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present invention.

[0022] Figure 1 A schematic diagram of the front view of a structure for preventing dust accumulation in the lower air chamber of a dry quenching furnace according to an embodiment of the utility model is shown;

[0023] Figure 2 A schematic top view of the structure for preventing dust accumulation in the lower air chamber of a dry quenching furnace according to an embodiment of the utility model is shown.

[0024] Description of reference numerals:

[0025] 1. Upper air chamber; 2. Lower air chamber; 3. Cross air duct; 4. Connecting valve; 5. Ash removal pipe. DETAILED DESCRIPTION

[0026] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0027] like Figure 1-2 As shown, a structure for preventing dust accumulation in the air chamber under a dry quenching furnace comprises:

[0028] A connecting valve 4, both ends of which are connected to the upper gas chamber 1 and the lower gas chamber 2 of the dry quenching furnace, respectively, so that the excess circulating gas in the lower gas chamber 2 can enter the upper gas chamber 1;

[0029] The ash removal pipe 5 is arranged in the lower air chamber 2, one end of the ash removal pipe 5 is an ash suction port, and the other end of the ash removal pipe 5 passes through the lower air chamber 2 and is exposed to the outside.

[0030] Specifically, the air pressure in the lower air chamber 2 is greater than the air pressure in the upper air chamber 1, and part of the circulating air enters the upper air chamber 1 through the lower air chamber 2 and the connecting valve 4, balancing the wind force while increasing the wind speed of the lower air chamber 2, and then gradually adjusting the connecting valve 4 according to the fluctuation of the coke discharge temperature in the production process, so that the excess circulating gas in the lower air chamber 2 can enter the upper air chamber 1 through the connecting valve 4, thereby increasing the flow rate of the circulating gas in the lower air chamber 2. The upper air chamber 1 will not cause coke powder to deposit due to the existence of the annular seam, and the ash accumulation in the lower air chamber 2 is also reduced. The ash removal pipe 5 can be used to discharge ash during the operation of the dry quenching furnace without stopping the furnace for manual cleaning.

[0031] Furthermore, the air outlet ends of the connecting valve and the ash removal pipe 5 are far away from the air inlet, and the air intake ratio of the upper and lower air chambers 2 is adjusted by cooperating with the air intake flaps of the upper and lower air chambers 2 through the connecting valve 4. The connecting valve 4 is fine-tuned on the basis of the air intake flap to reduce the problem of the air intake of the upper and lower air chambers 2 being affected by the increased wind resistance of the dust accumulation in the lower air chamber 2. The ash removal pipe 5 can be opened intermittently to discharge the dust, and the accumulated dust can be automatically discharged by suction or the air intake of the lower air chamber 2. During the ash discharge, the air distribution of the upper and lower air chambers 2 can be balanced by only adjusting the connecting valve 4.

[0032] Furthermore, in order to prevent the upper air chamber 1 from entering the lower air chamber 2, the connecting valve 4 may be provided with a one-way valve / check valve.

[0033] In this embodiment, the other end of the dust removal pipe 5 is connected to the dust removal pipe of the coke removal belt.

[0034] Specifically, the dust is removed by connecting the dust removal duct to the de-focusing belt and utilizing the suction force of the dust removal duct to remove the dust.

[0035] In this embodiment, one end of the ash removal pipe 5 is an annular pipe, which is arranged in the shape of the lower air chamber 2 and has a plurality of ash suction ports.

[0036] Specifically, the configuration of the lower air chamber 2 ensures that all parts of the lower air chamber 2 can be fully cleaned, and dust can be absorbed through the dust suction port.

[0037] In this embodiment, the annular duct is located below the cross air duct 3 .

[0038] Specifically, the ring-shaped pipe is close to the ground and absorbs the accumulated dust.

[0039] In this embodiment, the annular pipe is 10 mm from the ground.

[0040] Specifically, a certain height is set from the ground to ensure the suction efficiency and the suction range of the dust suction port, while preventing dust from accumulating in the suction dead corner of the annular pipe.

[0041] In this embodiment, a plurality of arc-shaped ash suction ports are arranged at intervals on the lower side wall of the annular pipe.

[0042] Specifically, the ash suction port is arranged along the circular track.

[0043] In this embodiment, the other end of the ash removal pipe 5 is away from the air inlet of the lower air chamber 2 .

[0044] Specifically, the wind is strong at the air inlet, so try to stay away from it to avoid the mutual influence of air intake and exhaust.

[0045] In this embodiment, an upper manhole and a lower manhole are opened on the same side of the upper air chamber 1 and the lower air chamber 2, and the connecting valve 4 is located between the upper manhole and the lower manhole.

[0046] Specifically, the existing upper manhole and lower manhole are far away from the air inlet side, so that the connecting valve 4 is also far away from the air inlet side, so that the excess wind force is distributed to the upper air chamber 1 only after the lower air chamber 2 is fully inlet.

[0047] In this embodiment, the connecting valve 4 is provided with multiple openings, which can adjust the air flow distribution ratio of the upper air chamber 1 and the lower air chamber 2 .

[0048] Specifically, the connecting valve 4 is used in different states by setting different opening degrees.

[0049] The utility model also provides a dry quenching furnace, comprising the above-mentioned structure for preventing dust accumulation in the lower air chamber of the dry quenching furnace.

[0050] Specifically, the CDQ furnace is equipped with a structure to prevent dust accumulation in the air chamber below the CDQ furnace, which replaces manual dust cleaning during furnace shutdown. Dust cleaning is more convenient and the daily operation of the CDQ furnace is more stable.

[0051] In this embodiment, a structure for preventing dust accumulation in the lower air chamber of a dry quenching furnace is used, taking the modification of a dry quenching furnace as an example:

[0052] A DN200 pipe is laid in the circumferential direction at a height of 10 mm from the ground below the cross air duct 3 of the lower air chamber 2 of the CDQ furnace, and several rectangular holes are opened below the pipe. A DN200 pipe is used to penetrate the steel shell of the CDQ furnace, one end of which is connected to the laid pipe, and the other end is connected to the dust removal pipe of the coke removal belt and a butterfly valve is installed;

[0053] Cut a DN200 small manhole near the upper and lower manholes and make a flange, connect the upper and lower air chambers 2 with a DN200 pipe, and install a connecting valve 4 in the middle;

[0054] After the transformation is completed, the opening of the air inlet flaps of the upper and lower air chambers 2 is readjusted during the actual production process. The original opening of the upper air chamber 1 is closed from 50% to 40%, and the opening of the lower air chamber 2 is increased from the original 60% to 70%. According to the fluctuation of the coke discharge temperature during the production process, the connecting valve 4 of the upper and lower air chambers 2 is gradually opened until it is fully opened. In this way, the excess circulating gas of the lower air chamber 2 can enter the upper air chamber 1 through the connecting valve 4, thereby increasing the flow rate of the circulating gas in the lower air chamber 2. The upper air chamber 1 will not cause coke powder to deposit due to the existence of the annular seam, and the ash accumulation in the lower air chamber 2 is also reduced. After long-term operation, the actual air intake ratio of the circulating air volume of the upper and lower air chambers 2 will not be changed, and the pipe valve connecting the lower air chamber 2 with the dust removal pipe will be opened 1-2 times a week, and each opening time is about 30 minutes. The environmental dust removal fan can be used to suck away a small amount of accumulated ash in the lower air chamber 2.

[0055] According to the comparison of the dust cleaning and weight inspection data of previous annual maintenance, about 7 tons of dust were cleaned during each annual maintenance before the transformation (annual maintenance is carried out approximately every two years). During the annual maintenance after the transformation, the lower air chamber 2 was entered to check the dust accumulation, and no large amount of dust was accumulated.

[0056] Through the use demonstration in the actual production process, this transformation will not affect the normal cooling effect of coke, but also greatly improve the ash accumulation phenomenon in the lower air chamber 2, achieving the ideal transformation effect.

[0057] The various embodiments of the utility model have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A structure for preventing dust accumulation in the air chamber under a dry quenching furnace, characterized in that: include: A connecting valve, the two ends of which are respectively connected to the upper air chamber and the lower air chamber of the CDQ furnace, so that the excess circulating gas in the lower air chamber can enter the upper air chamber; The ash removal pipe is arranged in the lower air chamber, one end of the ash removal pipe is an ash suction port, and the other end of the ash removal pipe passes through the lower air chamber and is exposed.

2. The structure for preventing dust accumulation in the air chamber below the dry quenching furnace according to claim 1 is characterized in that: The other end of the ash removal pipe is connected to the dust removal pipeline of the coke removal belt.

3. The structure for preventing dust accumulation in the air chamber below the dry quenching furnace according to claim 1 is characterized in that: The one end of the ash removal pipe is an annular pipe, the annular pipe is arranged in the lower air chamber, and a plurality of ash suction ports are arranged on the annular pipe.

4. The structure for preventing dust accumulation in the air chamber below the dry quenching furnace according to claim 3 is characterized in that: The annular pipeline is located below the cross air duct.

5. The structure for preventing dust accumulation in the air chamber below the dry quenching furnace according to claim 3 is characterized in that: The annular pipe is 10 mm away from the ground.

6. The structure for preventing dust accumulation in the air chamber below the dry quenching furnace according to claim 3 is characterized in that: The lower side wall of the annular pipe is provided with a plurality of arc-shaped ash suction ports at intervals.

7. The structure for preventing dust accumulation in the air chamber below the dry quenching furnace according to claim 1 is characterized in that: The other end of the ash removal pipe is away from the air inlet of the lower air chamber.

8. The structure for preventing dust accumulation in the air chamber below the dry quenching furnace according to claim 1 is characterized in that: An upper manhole and a lower manhole are provided on the same side of the upper air chamber and the lower air chamber, and the connecting valve is located between the upper manhole and the lower manhole.

9. The structure for preventing dust accumulation in the air chamber below the dry quenching furnace according to claim 1, characterized in that: The connecting valve is provided with multiple openings, and can adjust the air flow distribution ratio of the upper air chamber and the lower air chamber.

10. A dry quenching furnace, characterized in that: It comprises a structure for preventing dust accumulation in the lower air chamber of a dry quenching furnace according to any one of claims 1-9.

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