Air supplementing structure of dry quenching primary cyclone dust collector

Abstract

The utility model relates to an air supplement structure of a dry quenching primary cyclone dust collector, which comprises a primary dust collector and a central pipe, the central pipe is arranged at the center of the upper part of the primary dust collector, a circulating gas inlet of the primary dust collector is connected with a dry quenching furnace, and the bottom of the central pipe is communicated with an inner cavity of the primary dust collector; a circulating gas outlet in the upper end of the central pipe is connected with the waste heat boiler, a gas circulation channel is formed in the pipe wall of the central pipe, an air inlet is formed in the upper end of the gas circulation channel in the pipe wall of the central pipe, and an air outlet is formed in the lower end of the gas circulation channel in the pipe wall of the central pipe towards the interior of the central pipe. And the air leading-in outlet is an outlet which is vertically inward in the radial direction. According to the utility model, an air introduction mode is provided, burning loss of combustible gas components in circulating gas and a small amount (10%-20%) of residual fine coke powder in dust removal in the central pipe of the dust remover is realized, burning loss of most (80%-90%) removed coke powder is avoided, carbon burning loss in a carbon melting reaction is reduced, and carbon emission reduction is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of coking dry quenching, in particular to an air supplement structure for a primary cyclone dust collector of dry quenching coke. Background Technique

[0002] At present, the coking dry quenching process has been widely used because it can recover and utilize the sensible heat of red coke, improve the quality of coke, and reduce the environmental pollution caused by coke quenching operations. The dry quenching system mainly includes the following devices: a dry quenching furnace, a primary dust collector, a dry quenching coke boiler, a secondary dust collector, a fan, and a boiler feed water preheater device. The principle of the dry quenching process is as follows: using inert circulating gas to exchange heat with high-temperature coke, transferring the recovered heat to the waste heat boiler, heating water to generate steam through indirect heat exchange, and using the steam to drive a steam turbine for power generation, thereby realizing the recovery and utilization of the waste heat of red coke.

[0003] The inert circulating gas contains a certain amount of combustible gas components, such as hydrogen, carbon monoxide, etc. To ensure the safe operation of the dry quenching system and avoid accidents such as explosions, it is necessary to introduce air into the annular section of the dry quenching furnace in the high-temperature section of the dry quenching circulating gas. By introducing air (or other waste gases containing oxygen), the oxygen in the air is used to burn the combustible (CO, H2, etc.) gases in the circulating gas to make it lower than the safe explosion limit to ensure the safe operation of the system. Since the circulating gas contains a large amount of coke powder, a large amount of coke powder is also burned when the oxygen in the introduced air reacts with the combustible gas, converting it into CO2 and causing a large increase in CO2 in the circulating gas. The CO2 in the circulating gas enters the dry quenching furnace and contacts the incandescent coke to undergo a carbon melting reaction to generate CO, causing further burning of the coke. Currently, the carbon burning loss rate of the operating dry quenching coke device is usually between 1.5% and 2%. A 2-million-ton-per-year coking device burns 30,000 to 40,000 tons of coke per year and emits 110,000 to 146,000 tons of CO2. The dry quenching coke device is the second largest carbon emitter in coking. Therefore, reducing carbon burning loss is an important way to reduce carbon emissions in coking.

[0004] Carbon burning loss is mainly due to the oxygen in the introduced air burning the coke powder in the circulating gas. The burned coke powder is converted into CO2 and enters the dry quenching furnace with the circulating gas to undergo a carbon melting reaction with the incandescent coke, further burning the coke. Therefore, reducing the burning loss of coke powder and thus reducing CO2 in the circulating gas, and reducing CO2 in the circulating gas and then reducing the carbon melting reaction in the dry quenching furnace are important ways to overall reduce coke burning loss and carbon emissions.

[0005] In order to reduce the wear of the circulating gas dust on the dry quenching coke boiler and the circulating fan, a cyclone separation device is often used as the primary dust collector, and the dust removal efficiency is usually between 80% and 90%. The coke powder content in the circulating gas after dust removal is less than 20% and is usually fine coke powder. Therefore, the air introduction position should be changed from before the primary dust collector to before the waste heat boiler after primary dust removal.

[0006] The air inlet is arranged on the connecting pipe between the outlet of the dry coke quenching dust collector and the inlet of the waste heat boiler circulating gas (such as the Chinese patent application with the publication number CN107699255A, "A method and device for efficiently controlling the dust removal of a cyclone dust collector during low-load production of dry coke quenching"). However, this air inlet method has the following disadvantages: Due to the relatively compact layout of the equipment in the dry coke quenching process system, the length of the circulating gas pipeline between the outlet of the cyclone separation device and the inlet of the dry coke quenching boiler is short. After the air is introduced, it enters the dry coke quenching boiler before it has time to mix fully with the circulating gas and undergo a complete combustion reaction. As a result, the concentration of combustible gas components in the circulating gas after passing through the dry coke quenching boiler is still relatively high, and there is a relatively high concentration of oxygen components, thus significantly increasing the operating risk of the dry coke quenching system.

[0007]

[0007]

[0008] The dry coke quenching primary cyclone dust collector system and working method (such as the Chinese patent "A dry coke quenching primary dust removal system and working method with a gas mixing and combustion function" with the publication number CN 118085900 A) provide three technical methods for introducing air, and the addition points are all within the dust collector housing outside the central pipe of the cyclone dust collector. The purpose is to avoid this part of the gas from participating in the rotation of the circulating gas from the dry coke oven during dust removal in the upper part of the dust collector to reduce resistance. However, the air inlet point within the dust collector housing outside the central pipe of the cyclone dust collector will inevitably come into contact with the circulating gas being dusted and the dust being separated from the gas and dust, causing the dust being dusted to burn out, and failing to achieve the purpose of not burning out most (80 - 90%) of the already removed coke powder. Utility Model Content

[0009] The purpose of the present utility model is to provide an air supplement structure for a primary cyclone dust collector in coke dry quenching, to provide an air introduction method, and to achieve the combustion loss of combustible gas components and a small amount (10% - 20%) of remaining fine coke powder in the circulating gas inside the central pipe of the dust collector, avoiding the combustion loss of most (80% - 90%) of the coke powder that has been removed, thereby reducing the carbon combustion loss in the carbon melting reaction and achieving carbon emission reduction.

[0010] To achieve the above purpose, the present utility model is implemented by adopting the following technical solutions:

[0011] An air supplement structure for a primary cyclone dust collector in coke dry quenching, including a primary dust collector and a central pipe. The central pipe is located in the upper center of the primary dust collector. The circulating gas inlet of the primary dust collector is connected to a coke dry quenching furnace. The bottom of the central pipe is communicated with the inner cavity of the primary dust collector. The circulating gas outlet at the upper end of the central pipe is connected to a waste heat boiler. A gas flow channel is provided inside the pipe wall of the central pipe. An air inlet for introduction is provided at the upper end of the gas flow channel inside the pipe wall of the central pipe. The air outlet for introduction at the lower end of the gas flow channel inside the pipe wall of the central pipe is directed radially and vertically inward into the central pipe. The air outlet for introduction is a radially vertical inward outlet.

[0012] The gas flow channel inside the pipe wall of the central pipe is a sandwich structure in the form of a sleeve.

[0013] The height of the air inlet for introduction is below the height of two-thirds of the length of the central pipe measured upward from the bottom of the central pipe.

[0014] The introduced air is introduced into the middle of the upper part of the central pipe of the primary cyclone dust collector in the form of a sleeve, and enters the inside of the central pipe radially and vertically from the lower part of the central pipe of the primary cyclone dust collector, and collides violently with the rotating air flow entering the central pipe after cyclone separation and dust removal and mixes quickly.

[0015] The introduced air is introduced into the middle of the upper part of the central pipe of the primary cyclone dust collector in the form of a sleeve, which can evenly cool the inner cylinder and outer cylinder of the central pipe to prevent them from failing due to excessive temperature.

[0016] Compared with the existing technology, the beneficial effects of the present utility model are:

[0017] 1) In the present utility model, the air inlet for introduction is arranged in the jacket of the inner wall of the central pipe of the primary cyclone dust collector, so that under the condition that most (80% - 90%) of the larger particle coke powder is removed, the combustible components in the high-temperature circulating gas and a small amount (10% - 20%) of remaining fine coke powder are combusted, reducing the coke powder combustion loss and CO2 generation, and thus reducing the coke combustion loss due to the carbon melting reaction in the coke dry quenching furnace.

[0018] 2) Due to the mixing of air and high-temperature circulating gas in the central pipe and the combustion of combustible components and coke powder, it will not interfere with the rotational dust removal airflow of the cyclone dust collector, and thus will not affect the efficiency of the dust collector.

[0019] 3) Since the air inlet is arranged in the jacket of the inner wall of the central pipe of the primary cyclone dust collector, this part of the gas does not participate in dust removal, reducing the dust removal air volume, thereby reducing the load and resistance of the dust collector. Brief Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the air supplement structure of a primary cyclone dust collector for dry quenching coke in an embodiment of the present invention.

[0021] In the figure: 1. Primary cyclone dust collector, 2. Dry quenching coke furnace, 3. Waste heat boiler, 1-1 Circulating gas inlet, 4. Central pipe, 1-2 Introduced air inlet, 1-3 Circulating gas outlet, 1-4 Outer shell of the primary cyclone dust collector, 1-5 Outer shell of the central pipe, 1-6 Inner shell of the central pipe, 1-7 Coke powder outlet, 1-8 High-temperature circulating gas flow, 1-9 Introduced air flow, 1-10 Bottom of the central pipe, 1-11 Introduced air outlet. Detailed Embodiment

[0022] The following further illustrates the embodiments of the present invention in conjunction with specific embodiments:

[0023] As Figure 1 shown, an air supplement structure of a primary cyclone dust collector for dry quenching coke includes a primary dust collector 1 and a central pipe 4. The central pipe 4 is in the upper center of the primary dust collector 1. The circulating gas inlet 1-1 of the primary dust collector 1 is connected to the dry quenching coke furnace 2. The bottom of the central pipe 4 is communicated with the inner cavity of the primary dust collector 1. The circulating gas outlet 1-3 at the upper end of the central pipe 4 is connected to the waste heat boiler 3. A gas circulation channel is provided in the pipe wall of the central pipe 4. An introduced air inlet 1-2 is provided at the upper end of the gas circulation channel in the pipe wall of the central pipe 4. The lower end of the gas circulation channel in the pipe wall of the central pipe 4 is provided with an introduced air outlet 1-11 facing radially and vertically inward into the central pipe 4.

[0024] The gas circulation channel in the pipe wall of the central pipe 4 is a sandwich structure in the form of a sleeve.

[0025] The introduced air is introduced from the upper middle jacket of the central pipe 4 in the primary cyclone dust collector 1, enters the central pipe 4 radially and vertically from the lower part of the central pipe 4, and collides violently and mixes rapidly with the rotational airflow that enters the central pipe 4 after cyclone separation and dust removal.

[0026] The introduced air is introduced into the middle jacket at the upper part of the central pipe 4 in the primary cyclone dust collector 1, which can evenly cool the outer shell 1-5 of the central pipe and the inner shell 1-6 of the central pipe to prevent failure due to excessive temperature.

[0027] A conical coke powder outlet 1-7 is provided at the bottom of the primary dust collector 1.

[0028] The height of the introduced air inlet 1-2 is below the height of two-thirds of the length of the central pipe measured upward from the bottom of the central pipe 4.

[0029] A method for supplementing air to a dust collector with an air supplement structure for a primary cyclone dust collector in dry coke quenching, including: The circulating gas carrying a large amount of coke powder coming out from the upper part of the dry coke quenching furnace 2 enters the upper part of the primary cyclone dust collector 1, and most of the larger particles of coke powder in the gas are removed by cyclone in the rotating channel between the outer shell 1-4 of the primary cyclone dust collector and the central pipe 4. The separated coke powder descends and is discharged from the coke powder outlet 1-7 at the lower part of the primary cyclone dust collector 1. After the dust removal, the high-temperature circulating gas enters the inner part of the central pipe 4 in the upper part of the primary cyclone dust collector 1 after being separated from the coke powder. The introduced air enters from the upper part of the central pipe 4, descends through the gas flow channel in the pipe wall to the lower end of the central pipe 4, and vertically enters the central pipe 4 radially. The introduced air and the high-temperature circulating gas after dust removal are fully mixed and burned in the central pipe 4 by using the swirl of the high-temperature circulating gas after dust removal. After burning the combustible components in the high-temperature circulating gas and the remaining fine coke powder particles, it is discharged from the upper part of the central pipe 4.

[0030] Example 1:

[0031] An air supplement structure for a primary cyclone dust collector in dry coke quenching, including: a dry coke quenching furnace 2, a primary cyclone dust collector 1, and a waste heat boiler 3; the high-temperature circulating gas outlet at the upper part of the dry coke quenching furnace 2 is connected to the circulating gas inlet 1-1 at the upper part of the primary cyclone dust collector 1 through a pipeline; a coke powder outlet 1-7 is provided at the lower part of the primary cyclone dust collector 1; a central pipe 4 for discharging high-temperature circulating gas is provided in the middle of the upper part of the primary cyclone dust collector 1. The rotating channel for high-temperature circulating gas is between the outer shell 1-4 of the primary cyclone dust collector and the outer shell 1-5 of the central pipe. The high-temperature circulating gas discharge channel is inside the inner shell 1-6 of the central pipe. The casing air introduction channel is formed between the outer shell 1-5 of the central pipe and the inner shell 1-6 of the central pipe. The circulating gas discharge port 1-3 at the upper part of the central pipe 4 is connected to the inlet of the waste heat boiler 3 through a pipeline; the air inlet 1-2 at the upper part of the central pipe 4 is connected to an external air system.

[0032] The air supplement method for the primary cyclone dust collector 1 in this embodiment is to adopt the form of the channel between the outer shell 1-5 of the central pipe and the inner shell 1-6 of the central pipe, and send it to the air outlet 1-11 at the lower part of the central pipe 4 to enter the inner part of the inner shell 1-6 of the central pipe.

[0033] The working method of this embodiment includes the following steps:

[0034] 1) The high-temperature circulating gas carrying a large amount of coke powder coming out from the upper part of the coke dry quenching furnace 2 enters the rotary passage of the primary cyclone dust collector 1 through the upper circulating gas inlet 1-1 of the primary cyclone dust collector 1 to cyclone-remove most (80-90%) of the larger particles of coke powder in the gas. The separated coke powder descends and is discharged from the lower coke powder outlet 1-7 of the primary cyclone dust collector 1. After the dust removal, the high-temperature circulating gas is separated from the coke powder and enters the inner shell 1-6 of the central pipe through the bottom 1-10 of the central pipe.

[0035] 2) The introduced air is introduced into the inner shell 1-6 of the central pipe and the intermediate jacket between the outer shell 1-5 of the central pipe through the introduced air inlet 1-2 at the upper part of the central pipe 4, descends to the introduced air outlet 1-11 at the lower part of the central pipe 4, and enters the inside of the central pipe 4.

[0036] 3) The introduced air flow 1-9 and the high-temperature circulating gas flow 1-8 after dust removal are fully mixed and burned in the inner shell 1-6 of the central pipe by utilizing the swirl of the high-temperature circulating gas flow 1-8 after dust removal. After burning the combustible components in the high-temperature circulating gas and the remaining small amount of fine coke powder, it is discharged from the circulating gas outlet 1-3 at the upper part of the central pipe 4.

[0037] 4) The high-temperature circulating gas discharged from the circulating gas outlet 1-3 at the upper part of the central pipe 4 in the primary cyclone dust collector 1 enters the waste heat boiler 3.

[0038] In this embodiment, the introduced air only burns the combustible components in the high-temperature circulating gas and the small amount of fine coke powder remaining after the primary dust removal, and completes the mixed combustion in the central pipe 4.

[0039] Although the specific implementation manners of the utility model are described above in conjunction with the drawings, it is not a limitation to the protection scope of the utility model. Based on the technical solution of the utility model, various modifications or deformations that can be made by those skilled in the art without creative labor are still within the protection scope of the utility model.

Claims

1. An air replenishment structure for a primary cyclone dust collector for dry coke quenching, comprising a primary dust collector and a central pipe, wherein the central pipe is located at the center of the upper part of the primary dust collector, the circulating gas inlet of the primary dust collector is connected to the dry quenching furnace, the bottom of the central pipe is connected to the inner cavity of the primary dust collector, and the circulating gas outlet at the upper end of the central pipe is connected to the waste heat boiler, characterized in that: A gas circulation channel is provided in the tube wall of the central tube, an air inlet is provided at the upper end of the gas circulation channel in the tube wall of the central tube, and an air outlet is provided at the lower end of the gas circulation channel in the tube wall of the central tube toward the interior of the central tube, and the air outlet is a radially vertical inward outlet.

2. The air replenishment structure of the primary cyclone dust collector for dry coke quenching according to claim 1 is characterized in that: The gas flow channel in the wall of the central tube is a sleeve-type sandwich structure.

3. The air replenishing structure of the primary cyclone dust collector for dry coke quenching according to claim 1 is characterized in that: The height of the air inlet is below the height of 2 / 3 of the length of the central tube upward from the bottom of the central tube.

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